A cutter head resistance torque simulation device for shield intelligent tunneling experiments

Abstract

The present invention discloses a cutter head resistance torque simulation device for shield intelligent tunneling experiments, which includes a welding flange fixedly arranged on the front of the cutter head, a friction cylinder arranged on the welding flange, a central body arranged in the friction cylinder, and a torque sensor arranged above the central body. The other end of the torque sensor is connected with a support beam, and the support beam is arranged on the shield body; on the left and right sides of the cavity of the central body, resistance blocks are symmetrically arranged in a sliding manner, and the two resistance blocks are respectively connected with the two ends of an oil cylinder placed in the central body; arc friction plates are respectively arranged on the outer sides of the resistance blocks. The present invention can be used to simulate the resistance torque encountered during the tunneling of the cutter head in shield tunneling experiments. By controlling the magnitude and variation law of the frictional resistance torque, the changes in geological conditions, cutter head state, etc. during shield tunneling can be simulated, so as to conduct in-depth research and optimization on the shield intelligent tunneling control system.

Description

Technical Field

[0001] The present invention relates to the technical fields of tunnel engineering and shield equipment manufacturing, and particularly relates to a cutter head resistance torque simulation device for shield intelligent tunneling experiments. Background Art

[0002] With the rapid development of intelligent technologies, intelligent construction has been increasingly applied in the field of engineering construction. As an important equipment for tunnel construction, the intelligent technology of shield machines has developed to a certain extent in recent years, and shield intelligent tunneling has been tested and applied in some projects. However, due to the complexity of the shield construction process, the diverse geological environments, and the particularities of different projects, the engineering adaptability of the shield intelligent tunneling control system is insufficient. Conducting shield intelligent tunneling experiments under various working conditions at the construction site may lead to potential construction risks. Therefore, it is necessary to develop equipment that can be used to conduct various shield intelligent tunneling experiments to meet the development and testing requirements of the shield intelligent tunneling control system.

[0003] The cutter head is the core component of a shield. The process of a shield machine excavating a tunnel is that the cutter head penetrates the formation and continuously rotates to cut the formation under the combined action of the shield propulsion system and the main drive system. When the cutter head rotates, the formation, muck, slurry, etc. continuously act on the cutter head to generate a resistance torque. Changes in the propulsion force, formation conditions, and tool states will all cause changes in the resistance torque. Conducting tunneling experiments on the shield cutter head must be able to simulate these boundary conditions of the cutter head operation. Existing technologies generally provide a cutter head tunneling environment by filling soil to construct a simulated formation. This method requires a large amount of work such as filling, compaction, and cleaning for each experiment, which is time-consuming and laborious, and it is difficult to achieve mechanical properties corresponding to the actual formation. In addition, the consistency of the filling effect is poor, resulting in poor repeatability of the experimental results and unable to meet the requirements of conducting a large number of repeatable experiments for intelligent control research. Therefore, it is necessary to develop a device that can conveniently simulate boundary conditions such as the resistance torque of the cutter head tunneling to provide support for the development of shield intelligent tunneling experiments. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a cutter head resistance torque simulation device for shield intelligent tunneling experiments to overcome the deficiencies of the prior art, which can realize the loading and control of the cutter head resistance torque, thereby realizing the simulation of different working conditions encountered during cutter head tunneling.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A cutterhead resistance torque simulation device for shield intelligent tunneling experiments, comprising a welding flange fixedly arranged on the front of the cutterhead, a friction cylinder arranged on the welding flange, a central body arranged in the friction cylinder, and a torque sensor arranged above the central body. The other end of the torque sensor is connected to a support beam, and the support beam is arranged on the shield body; the axes of the welding flange, the friction cylinder, and the central body all coincide with the rotation axis of the cutterhead; on the left and right sides of the cavity of the central body, resistance blocks are symmetrically arranged in a sliding manner. The two resistance blocks are respectively connected to the two ends of an oil cylinder placed in the central body. The resistance blocks can generate a certain displacement in the left-right direction relative to the central body, which can absorb the coaxiality error between the friction cylinder and the central body and ensure the running stability; arc-shaped friction plates are respectively arranged on the outer sides of the resistance blocks, and the friction plates are in contact connection with the inner wall of the friction cylinder.

[0007] For the above technical solution, when the rodless cavity of the oil cylinder is pressurized, the two resistance blocks extend out and press against the inner wall of the friction cylinder to form a pressing force. When the cutterhead rotates, a pair of frictional forces are generated on the left and right contact surfaces, forming a frictional resistance torque; by adjusting the thrust of the oil cylinder, the magnitude of the frictional resistance torque can be adjusted, so as to simulate the resistance torque encountered during the tunneling of the cutterhead; the frictional resistance torque is transmitted to the torque sensor fixedly installed on the support beam through the resistance blocks and the central body, so as to realize the real-time monitoring and control of the frictional resistance torque; the support beam is fixed on the front shield to overcome the frictional resistance torque transmitted by the torque sensor.

[0008] This device can be used to simulate the resistance torque generated by the rotation and cutting of the cutterhead during shield tunneling experiments. By controlling the magnitude and change law of the frictional resistance torque, the changes of geological conditions, cutterhead state, etc. during shield tunneling can be simulated, and the intelligent control method of the cutterhead drive can be studied.

[0009] Preferably, a heat dissipation cavity is arranged inside the resistance block, and a water inlet pipe and a drain pipe are arranged on the heat dissipation cavity. Cooling water is injected through the water inlet pipe and fills the heat dissipation cavity and then discharged through the drain pipe, so as to continuously take away the heat generated by the friction cylinder and the friction plate, reduce the contact surface temperature, and avoid the contact surface temperature from being too high.

[0010] Preferably, a non-contact temperature sensor is arranged on the central body.

[0011] Preferably, an atomizing nozzle is arranged on the central body.

[0012] When the temperature sensor monitors that the temperature of the inner wall of the friction cylinder is too high, the atomizing nozzle is opened to directly spray cooling water on the inner wall of the friction cylinder to achieve rapid cooling.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention realizes the loading of the cutting head driving resistance moment on the shield tunneling experimental platform under the condition of avoiding the construction of actual formation conditions, avoiding the large amount of time, manpower and material resources consumed in the formation construction, simplifying the experimental preparation and cleaning process, and greatly improving the experimental efficiency.

[0015] 2. The present invention has good repeatability and can reproduce the same working conditions multiple times, which is very suitable for the testing, training and improvement of the shield intelligent control system, and improves the system development efficiency.

[0016] 3. By installing a torque sensor between the central body and the support beam, the magnitude and change law of the resistance moment can be directly and real-time monitored, which is convenient for adjusting and precisely controlling the magnitude of the resistance moment of the device.

[0017] 4. By controlling the magnitude and change mode of the frictional resistance moment, different formations and working conditions can be simulated, and common abnormal working conditions such as difficult rock breaking and cutting head blockage can also be simulated, so as to test the stability of the intelligent control system under various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is an installation schematic diagram of the present invention;

[0020] Figure 3 is a sectional view of the present invention;

[0021] Figure 4 is a state diagram of the resistance block retracted;

[0022] Figure 5 is a state diagram of the resistance block extended.

[0023] In the figure: 1 support beam, 2 welding flange, 3 friction cylinder, 4 central body, 5 oil cylinder, 6 resistance block, 7 torque sensor, 8 cutting head, 9 shield body, 10 friction plate, 11 heat dissipation cavity, 12 water inlet pipe, 13 drain pipe, 14 temperature sensor, 15 atomizing nozzle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below in conjunction with the drawings and embodiments.

[0025] As Figures 1-5As shown, a cutterhead resistance torque simulation device for shield intelligent excavation experiment includes a support beam 1, a welding flange 2, a friction cylinder 3, a central body 4, an oil cylinder 5, a resistance block 6 and a torque sensor 7. The support beam 1 is installed on the front shield of the shield body 9 to support the cutterhead resistance torque device and balance the cutterhead resistance torque; the welding flange 2 is welded on the front of the cutterhead 8, and the axis of the welding flange 2 coincides with the rotation axis of the cutterhead 8; the friction cylinder 3 is concentrically installed on the welding flange 2 and rotates synchronously with the cutterhead 8; the central body 4 is located inside the friction cylinder 3 and is coaxially arranged with the friction cylinder 3 to ensure the stability of the operation process; the left and right ends of the central body 4 are respectively provided with interconnected mounting grooves, and resistance blocks 6 are respectively placed in the two mounting grooves. The resistance blocks 6 can move left and right in the mounting grooves, and the two resistance blocks 6 are respectively connected to the two ends of the oil cylinder 5. Under the action of the oil cylinder 5, the resistance blocks 6 have a certain left and right floating amount relative to the central body in the horizontal direction, which can absorb the coaxiality error of the friction cylinder 3 and the central body 4 during assembly. An arc-shaped friction plate 10 is installed at the outer end of the resistance block 6, and the outer diameter of the friction plate is the same as the diameter of the inner wall of the friction cylinder (that is, the two are in contact); one end of the torque sensor 7 is fixed on the center block 4, and the other end is fixed on the support beam 8, and is connected to an external control device for real-time monitoring of the resistance torque.

[0026] A heat dissipation cavity is provided inside the resistance block, and a water inlet pipe 12 and a drain pipe 13 are provided on the heat dissipation cavity. Cooling water is input into the heat dissipation cavity 11 through the water inlet pipe 12 and discharged through the drain pipe 13, so as to continuously take away the heat generated by the friction of the contact surface and reduce the temperature of the contact surface.

[0027] A non-contact temperature sensor 14 and an atomizing nozzle 15 are also provided on the central body. When the non-contact temperature sensor 14 detects that the temperature of the inner wall of the friction cylinder 3 is too high, the atomizing nozzle 15 is turned on to spray cooling water directly onto the inner wall of the friction cylinder to enhance the cooling effect.

[0028] The non-contact temperature sensor 14 and the atomizing nozzle 15 can be connected to an external controller and turned on by the controller. The connection method and control method between them are conventional methods.

[0029] In the non-working state, the oil cylinder 5 is fully retracted, so that the resistance block 6 is out of contact with the friction cylinder 3, and no friction resistance torque is generated at this time; in the working state, the rodless chamber of the oil cylinder 5 is pressurized to make the resistance block 6 extend from the cavity of the central body 4, and press the inner wall of the friction cylinder 3 to form a positive pressure, thereby generating a pair of static friction resistances; when the cutter head 8 drives the friction cylinder 3 to rotate, the static friction force generated by the contact surfaces on the left and right sides is converted into a pair of dynamic friction forces of equal magnitude and opposite direction, thereby forming a cutter head resistance torque; the size of the cutter head resistance torque can be adjusted by adjusting the thrust of the oil cylinder 5, thereby simulating the resistance torque encountered by the cutter head during excavation. The relationship between the thrust of the oil cylinder 5 and the friction resistance torque generated by the device is:

[0030] T f = μF N D f

[0031] where μ is the coefficient of friction, F N is the thrust of the oil cylinder, and D f is the inner diameter of the friction cylinder.

[0032] The cutting head resistance torque is transmitted to the torque sensor 7 through the friction cylinder 3, the resistance block 6, and the central body 4. Through the torque sensor 7 installed between the central body 4 and the support beam 1, the friction resistance torque T f magnitude and variation law can be directly and real-time monitored. By adjusting the thrust of the oil cylinder 5, the resistance torque generated by the device can be precisely controlled, so as to realize flexible and repeatable simulation and reproduction of the cutting head tunneling conditions.

[0033] In the above embodiments, the equipment components involved, unless otherwise specified, are all conventional equipment components. The structural setting methods, working methods, or control methods involved, unless otherwise specified, are all conventional setting methods, working methods, or control methods in the art.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cutter head resistance torque simulation device for shield intelligent tunneling experiment, characterized in that It includes a welding flange fixedly arranged on the front of the cutter head, a friction cylinder arranged on the welding flange, a central body arranged in the friction cylinder, and a torque sensor arranged above the central body. The other end of the torque sensor is connected with a support beam, and the support beam is arranged on the shield body; the axes of the welding flange, the friction cylinder and the central body all coincide with the rotation axis of the cutter head; on the left and right sides of the cavity of the central body, resistance blocks are symmetrically arranged in a sliding manner. The two resistance blocks are respectively connected with the two ends of an oil cylinder, and the resistance blocks can generate a certain displacement amount in the left and right directions relative to the central body; arc-shaped friction plates are respectively arranged on the outer sides of the resistance blocks, and the friction plates are in contact connection with the inner wall of the friction cylinder.

2. The cutter head resistance torque simulation device for shield intelligent tunneling experiment according to claim 1, wherein, A heat dissipation cavity is arranged inside the resistance block, and a water inlet pipe and a drain pipe are arranged on the heat dissipation cavity.

3. The cutter head resistance torque simulation device for shield intelligent tunneling experiment according to claim 1, characterized in that A non-contact temperature sensor is arranged on the central body.

4. The cutter head resistance torque simulation device for shield intelligent tunneling experiment according to claim 1, characterized in that An atomizing nozzle is arranged on the central body.

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