Internal telescopic shield of heading machine, heading machine main machine and heading machine

Abstract

The utility model provides an inner telescopic shield of a heading machine, a heading machine main machine and the heading machine, and belongs to the technical field of tunneling equipment. The inner telescopic shield comprises a shield body, the tail of the shield body is provided with an opening allowing bottom accumulated slag to enter the shield body during step changing of the supporting shield, the inner telescopic shield further comprises a slag stopping door movably installed on the shield body, and a blocking station for blocking the opening and an opening station for opening the opening are arranged in the moving stroke of the slag stopping door. The shield body is provided with a driving mechanism which is in driving connection with the slag blocking door so as to control the slag blocking door to be switched between the blocking station and the opening station. According to the utility model, the opening at the tail part of the shield body is opened and closed by controlling the telescopic movement of the slag stopping door, so that the shield can adapt to various stratums, and the adaptability of the heading machine under different geological conditions is improved.

Description

Technical Field

[0001] The utility model relates to an inner telescopic shield of a tunnel boring machine, a tunnel boring machine main machine and the tunnel boring machine, and belongs to the technical field of tunnel boring equipment. Background Art

[0002] During tunneling with a dual-shield TBM, because the outer diameter of the inner telescopic shield is smaller than that of the outer and support shields, the inner and support shields move forward synchronously relative to the outer telescopic shield when the support shield shifts. This causes the annular space around the inner telescopic shield to change, and the front end of the support shield squeezes the debris within the annular space forward. Delayed removal of this debris from this space can easily lead to slag accumulation. In good geological conditions (i.e., relatively intact surrounding rock), slag accumulation during support shield shifts is minimal. However, in poor geological conditions (such as faults and fractured zones), slag can easily accumulate at the rear of the inner telescopic shield during shifts. Excessive slag accumulation can easily deform the inner telescopic shield, affecting the support shield's posture and, consequently, hindering the TBM's progress.

[0003] In this regard, the utility model patent with authorization announcement number CN208416544U discloses a double-shield TBM inner telescopic shield structure, which discloses that an opening for discharging accumulated slag is set at the lower part of the rear end of the inner telescopic shield body. During the step-forward process of the support shield, the accumulated slag generated in the gap between the inner telescopic shield body and the support shield is discharged into the inner telescopic shield body at the opening, and then manual slag removal is used to prevent the accumulation of accumulated slag from exerting pressure on the inner telescopic shield body and avoid deformation of the inner telescopic shield.

[0004] The opening at the tail of the inner telescopic shield is normally open. However, during the construction of the same tunnel, some sections have better geology and some sections have worse geology. When the geological conditions are good, not much slag is generated when the support shield changes steps. The slag can pass through the bottom of the support shield (a slag groove is provided at the bottom of the support shield). However, if the opening at the tail of the inner telescopic shield is open, the slag will pass through the bottom of the support shield under the squeezing of the support shield, and the other part will enter the interior of the inner telescopic shield through the opening. This requires manual cleaning of the incoming slag, which increases labor intensity. If the incoming slag is not cleaned in time, it will cause wear on the internal components, which will lead to abnormal damage to the internal components and increase on-site construction costs. Utility Model Content

[0005] The purpose of the present utility model is to provide an internal telescopic shield for a tunnel boring machine, so as to solve the problem in the prior art that when constructing a section with good geological conditions, although the accumulated slag generated by the change of the support shield is not much, the slag will enter the interior of the internal telescopic shield through the opening at the tail of the internal telescopic shield, resulting in the need for manual cleaning of the entered slag, increasing labor intensity, and if the entered slag is not cleaned in time, it will cause wear to the internal components, thereby causing abnormal damage to the internal components and increasing on-site construction costs; the purpose of the present utility model is also to provide a tunnel boring machine main unit and a tunnel boring machine, so as to solve the above problems.

[0006] To achieve the above objectives, the internal telescopic shield of the tunnel boring machine in the present invention adopts the following technical solutions:

[0007] An internal telescopic shield for a tunnel boring machine, the internal telescopic shield comprising a shield body, a tail portion of the shield body being provided with an opening for bottom slag to enter the shield body when the support shield changes steps, the internal telescopic shield also comprising a slag blocking door movably mounted on the shield body, the slag blocking door having a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke, a driving mechanism being mounted on the shield body and drivingly connected to the slag blocking door to control the slag blocking door to switch between the blocking position and the opening position.

[0008] The beneficial effects of the above technical solution are as follows: the utility model belongs to an improved invention, the inner telescopic shield adds a slag-blocking door that is movable and mounted on the shield body, the slag-blocking door has a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke, and a driving mechanism is installed on the shield body, which is connected to the slag-blocking door to control the slag-blocking door to switch between the blocking position and the opening position. In this way, when constructing in a section with poor geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the opening position, which is convenient for manual slag cleaning and avoids the problem of excessive slag accumulation squeezing and deforming the inner telescopic shield and affecting the posture of the support shield. When constructing in a section with good geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the blocking position, so that all the accumulated slag generated by the step change of the support shield passes through the bottom of the support shield and avoids entering the interior of the inner telescopic shield, thereby eliminating the need for manual cleaning and increasing labor intensity. At the same time, it solves the problem that internal components will be worn due to untimely cleaning, which in turn causes abnormal damage to the internal components and increases on-site construction costs.

[0009] Furthermore, the axis of the shield body is defined to extend in the front-to-back direction, the slag blocking door is located on the inner side of the shield body, and the driving mechanism is used to control the forward and backward movement of the slag blocking door to switch between the blocking position and the opening position.

[0010] Furthermore, a guide structure for guiding the forward and backward movement of the slag blocking door is provided between the slag blocking door and the shield body.

[0011] Furthermore, the guide structure includes two guide rails fixed on the inner wall of the shield body and extending in the front-to-back direction. A guide groove for the end of the slag blocking door to extend into is provided on the guide rails or between the guide rails and the inner wall of the shield body.

[0012] Furthermore, the slag blocking door is an arc-shaped plate concentric with the shield body.

[0013] Furthermore, the driving mechanism is a telescopic driving device for outputting linear motion, one end of the telescopic driving device is hinged to the inner wall of the shield body, and the other end is hinged to the slag blocking door.

[0014] Furthermore, there is only one telescopic drive device, the hinge point between the telescopic drive device and the inner wall of the shield body is located at the bottom of the inner wall of the shield body, and the hinge point between the telescopic drive device and the slag blocking door is located in the middle between the left and right ends of the slag blocking door.

[0015] Furthermore, the telescopic drive device is a telescopic oil cylinder, and the hydraulic system connected to the telescopic oil cylinder includes a solenoid valve for controlling the extension and retraction of the piston rod of the telescopic oil cylinder to switch the slag blocking door between the blocking position and the opening position.

[0016] In order to achieve the above-mentioned purpose, the main machine of the tunnel boring machine in the present invention adopts the following technical solutions:

[0017] A tunnel boring machine main body includes an outer telescopic shield, an inner telescopic shield and a support shield. The inner telescopic shield includes a shield body. The tail of the shield body is provided with an opening for the bottom slag to enter the inside of the shield body when the support shield changes steps. The inner telescopic shield also includes a slag blocking door movably mounted on the shield body. The slag blocking door has a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke. A driving mechanism is installed on the shield body to be connected to the slag blocking door drive to control the slag blocking door to switch between the blocking position and the opening position.

[0018] The beneficial effect of the above technical solution is that: the utility model belongs to an improved invention, which further defines the inner telescopic shield. The inner telescopic shield adds a slag-blocking door that is movably installed on the shield body. The slag-blocking door has a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke. A driving mechanism is installed on the shield body, which is connected to the slag-blocking door to control the slag-blocking door to switch between the blocking position and the opening position. In this way, when constructing in a section with poor geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the opening position, which is convenient for manual slag cleaning and avoids the problem of excessive slag accumulation squeezing and deforming the inner telescopic shield and affecting the posture of the support shield. When constructing in a section with good geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the blocking position, so that all the accumulated slag generated by the support shield changing steps passes through the bottom of the support shield and avoids entering the interior of the inner telescopic shield, thereby eliminating the need for manual cleaning and increasing labor intensity. At the same time, it solves the problem that internal components will be worn due to untimely cleaning, which in turn causes abnormal damage to the internal components and increases on-site construction costs.

[0019] Furthermore, the axis of the shield body is defined to extend in the front-to-back direction, the slag blocking door is located on the inner side of the shield body, and the driving mechanism is used to control the forward and backward movement of the slag blocking door to switch between the blocking position and the opening position.

[0020] Furthermore, a guide structure for guiding the forward and backward movement of the slag blocking door is provided between the slag blocking door and the shield body.

[0021] Furthermore, the guide structure includes two guide rails fixed on the inner wall of the shield body and extending in the front-to-back direction. A guide groove for the end of the slag blocking door to extend into is provided on the guide rails or between the guide rails and the inner wall of the shield body.

[0022] Furthermore, the slag blocking door is an arc-shaped plate concentric with the shield body.

[0023] Furthermore, the driving mechanism is a telescopic driving device for outputting linear motion, one end of the telescopic driving device is hinged to the inner wall of the shield body, and the other end is hinged to the slag blocking door.

[0024] Furthermore, there is only one telescopic drive device, the hinge point between the telescopic drive device and the inner wall of the shield body is located at the bottom of the inner wall of the shield body, and the hinge point between the telescopic drive device and the slag blocking door is located in the middle between the left and right ends of the slag blocking door.

[0025] Furthermore, the telescopic drive device is a telescopic oil cylinder, and the hydraulic system connected to the telescopic oil cylinder includes a solenoid valve for controlling the extension and retraction of the piston rod of the telescopic oil cylinder to switch the slag blocking door between the blocking position and the opening position.

[0026] In order to achieve the above-mentioned purpose, the tunnel boring machine in the present invention adopts the following technical solutions:

[0027] A tunnel boring machine includes a main machine and rear supporting equipment. The main machine includes an outer telescopic shield, an inner telescopic shield and a support shield. The inner telescopic shield includes a shield body. The tail of the shield body is provided with an opening for the bottom accumulated slag to enter the inside of the shield body when the support shield changes steps. The inner telescopic shield also includes a slag blocking door movably mounted on the shield body. The slag blocking door has a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke. A driving mechanism is installed on the shield body, which is connected to the slag blocking door drive to control the slag blocking door to switch between the blocking position and the opening position.

[0028] The beneficial effect of the above technical solution is that: the utility model belongs to an improved invention, which further defines the inner telescopic shield. The inner telescopic shield adds a slag-blocking door that is movably installed on the shield body. The slag-blocking door has a blocking position for blocking the opening and an opening position for opening the opening in its movable stroke. A driving mechanism is installed on the shield body, which is connected to the slag-blocking door to control the slag-blocking door to switch between the blocking position and the opening position. In this way, when constructing in a section with poor geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the opening position, which is convenient for manual slag cleaning and avoids the problem of excessive slag accumulation squeezing and deforming the inner telescopic shield and affecting the posture of the support shield. When constructing in a section with good geological conditions, the slag-blocking door can be controlled by the driving mechanism to switch to the blocking position, so that all the accumulated slag generated by the support shield changing steps passes through the bottom of the support shield and avoids entering the interior of the inner telescopic shield, thereby eliminating the need for manual cleaning and increasing labor intensity. At the same time, it solves the problem that internal components will be worn due to untimely cleaning, which in turn causes abnormal damage to the internal components and increases on-site construction costs.

[0029] Furthermore, the axis of the shield body is defined to extend in the front-to-back direction, the slag blocking door is located on the inner side of the shield body, and the driving mechanism is used to control the forward and backward movement of the slag blocking door to switch between the blocking position and the opening position.

[0030] Furthermore, a guide structure for guiding the forward and backward movement of the slag blocking door is provided between the slag blocking door and the shield body.

[0031] Furthermore, the guide structure includes two guide rails fixed on the inner wall of the shield body and extending in the front-to-back direction. A guide groove for the end of the slag blocking door to extend into is provided on the guide rails or between the guide rails and the inner wall of the shield body.

[0032] Furthermore, the slag blocking door is an arc-shaped plate concentric with the shield body.

[0033] Furthermore, the driving mechanism is a telescopic driving device for outputting linear motion, one end of the telescopic driving device is hinged to the inner wall of the shield body, and the other end is hinged to the slag blocking door.

[0034] Furthermore, there is only one telescopic drive device, the hinge point between the telescopic drive device and the inner wall of the shield body is located at the bottom of the inner wall of the shield body, and the hinge point between the telescopic drive device and the slag blocking door is located in the middle between the left and right ends of the slag blocking door.

[0035] Furthermore, the telescopic drive device is a telescopic oil cylinder, and the hydraulic system connected to the telescopic oil cylinder includes a solenoid valve for controlling the extension and retraction of the piston rod of the telescopic oil cylinder to switch the slag blocking door between the blocking position and the opening position. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a partial front view of the main engine of the tunnel boring machine of the present invention;

[0037] Figure 2 This is a partial side view of the main engine of the tunnel boring machine of the present invention;

[0038] Figure 3 for Figure 1 A partial enlarged view of the

[0039] Figure 4 for Figure 2 A partial enlarged view of the .

[0040] In the figure: 1. External telescopic shield; 2. Shield body; 2-1. Opening; 3. Telescopic cylinder; 4. Slag blocking door; 5. Support shield; 6. Guide rail; 7. Solenoid valve; 8. Articulated cylinder. DETAILED DESCRIPTION

[0041] In response to the technical problems existing in the prior art, the basic concept of the present invention is to add a slag retaining door and set a driving mechanism to control the slag retaining door to switch between the blocking position and the opening position, so as to control the slag retaining door to be in the blocking position or the opening position according to different geological conditions. When constructing a section with good geological conditions, the slag retaining door can be controlled to be in the blocking position, so that all the accumulated slag generated by the step change of the support shield passes through the bottom of the support shield and avoids entering the interior of the inner telescopic shield.

[0042] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0043] Embodiment 1 of the main engine of the tunnel boring machine in the present utility model:

[0044] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the main body of the tunnel boring machine includes an outer telescopic shield 1, an inner telescopic shield, and a support shield 5. The outer telescopic shield 1 is fixedly connected to the front shield and is designed concentrically with the inner telescopic shield. The inner telescopic shield includes a shield body 2, the axis of which extends in the fore-aft direction. The rear end of the shield body 2 is provided with an opening 2-1 for the bottom slag to enter the interior of the shield body 2 when the support shield 5 changes steps. The opening 2-1 is a rearward-facing U-shaped opening and is of moderate size, with an appropriate width in the fore-aft direction and an appropriate length in the circumferential direction. This ensures space for manual slag removal while preventing excess slag from the top and sides of the tunnel from sliding directly into the opening 2-1 along the outer surface of the shield body 2. The support shield 5 is located behind the telescopic shield. The shield body 2 of the inner telescopic shield is connected to the support shield 5 via an articulated cylinder 8.

[0045] The inner telescopic shield also includes a slag-blocking door 4 movably mounted on the shield body 2. The slag-blocking door 4 has a blocking position for blocking the opening 2-1 and an opening position for opening the opening 2-1 in its movable travel. A driving mechanism is installed on the shield body 2 and is connected to the slag-blocking door 4 to control the switching of the slag-blocking door 4 between the blocking position and the opening position. In this way, when constructing in a section with poor geological conditions, the slag-blocking door 4 can be controlled by the driving mechanism to switch to the opening position, which is convenient for manual slag cleaning and avoids the problem of excessive slag accumulation squeezing and deforming the inner telescopic shield and affecting the posture of the support shield. When constructing in a section with good geological conditions, the slag-blocking door 4 can be controlled by the driving mechanism to switch to the blocking position, so that all the accumulated slag generated by the step change of the support shield 5 passes through the bottom of the support shield 5 and avoids entering the interior of the inner telescopic shield, thereby eliminating the need for manual cleaning and avoiding increased labor intensity. At the same time, it solves the problem that untimely cleaning will cause wear on internal components, thereby causing abnormal damage to internal components and increasing on-site construction costs. Therefore, the inner telescopic shield of the utility model is more flexible to use and can be applied to a variety of working conditions.

[0046] Specifically, in this embodiment, the slag-blocking door 4 is located on the inner side of the shield body 2 and is a curved plate concentric with the shield body 2. Its dimensions are consistent with those of the opening 2-1, which provides a better sealing effect. The aforementioned drive mechanism is used to control the forward and backward movement of the slag-blocking door 4 to switch between the blocking position and the open position. This movement method is relatively simple and facilitates the control of the movement of the slag-blocking door 4. The slag-blocking door 4 also moves close to the inner wall of the shield body 2, does not occupy excessive space during movement, and does not interfere with other components.

[0047] Furthermore, the above-mentioned driving mechanism is a telescopic driving device for outputting linear motion, one end of the telescopic driving device is hinged to the inner wall of the shield body 2, and the other end is hinged to the slag-blocking door 4. Corresponding hinged ear plates are provided on the inner wall of the shield body 2 and the slag-blocking door 4. This form of driving mechanism is convenient for configuration and installation. Specifically in the present embodiment, the telescopic driving device is a telescopic oil cylinder 3, which can not only provide sufficient driving force, but also can be directly connected to the hydraulic system of the main machine, and is relatively easy to install. In addition, the hydraulic system to which the telescopic oil cylinder 3 is connected includes a solenoid valve 7 for controlling the extension and retraction of the piston rod of the telescopic oil cylinder 3 so that the slag-blocking door 4 can be switched between the blocking station and the opening station, such as a three-position four-way solenoid valve. The solenoid valve 7, as a control unit, can directly control the action of the telescopic oil cylinder 3 according to different working conditions, thereby driving the slag-blocking door 4 to move to a specified position, and is relatively easy to control.

[0048] Furthermore, only one telescopic cylinder 3 is provided, and the hinge point between the telescopic cylinder 3 and the inner wall of the shield body 2 is located at the bottom of the inner wall of the shield body 2, and the hinge point between the telescopic cylinder 3 and the slag blocking door 4 is located in the middle between the left and right ends of the slag blocking door 4. This not only reduces the configuration cost and avoids the structure being too complicated, but also ensures that the driving force of the telescopic cylinder 3 is centered, ensuring that the force on the slag blocking door 4 is centered.

[0049] Furthermore, a guide structure for guiding the forward and backward movement of the slag-blocking door 4 is provided between the slag-blocking door 4 and the shield body 2, thereby ensuring smooth movement of the slag-blocking door 4. Specifically, in this embodiment, the guide structure includes two guide rails 6 fixed to the inner wall of the shield body 2 and extending in the front-to-back direction. The cross-section of the guide rails 6 is L-shaped, thereby forming a guide groove between the guide rails 6 and the inner wall of the shield body 2 for the end of the slag-blocking door 4 to extend into. This form of guide structure is relatively simple and convenient for processing, manufacturing and installation. At the same time, the guide groove is provided between the guide rails 6 and the inner wall of the shield body 2, which can ensure that the slag-blocking door 4 is close to the inner wall of the shield body 2 to the greatest extent, thereby ensuring the blocking effect.

[0050] When the main engine of the tunnel boring machine of the present invention is in use, according to different geological conditions, the telescopic oil cylinder 3 is controlled by the solenoid valve 7 to push and pull the slag blocking door 4 to move forward and backward along the guide rail 6, thereby realizing the opening and closing of the opening 2-1 at the tail of the shield body 2. The specific application conditions are as follows:

[0051] Working condition 1: In a stratum with intact surrounding rock (i.e., a section with good geological conditions), the slag blocking door 4 is controlled to move backward by the telescopic cylinder 3 to block the opening 2-1. At this time, the accumulated slag generated by the step change of the support shield 5 is not much, and the accumulated slag can all pass through the bottom of the support shield 5 without entering the interior of the inner telescopic shield, preventing the slag from accumulating between the tail of the inner telescopic shield and the front of the support shield 5.

[0052] Working condition 2: In the surrounding rock fractured stratum (i.e. the section with poor geological conditions), the slag blocking door 4 is controlled to move forward by the telescopic cylinder 3 to open the opening 2-1. At this time, there is a lot of slag accumulated when the support shield 5 changes steps. The slag can enter the shield body 2 through the opening 2-1 and then be cleared manually.

[0053] Working Condition 3: When the TBM becomes stuck, the telescopic cylinder 3 controls the slag gate 4 to move forward, while the articulated cylinder 8 controls the inner telescopic shield to move forward and away from the support shield 5, thereby forming an annular gap between the inner telescopic shield and the support shield 5 to expose the surrounding rock. A pilot hole is then excavated in the surrounding rock to access the cutterhead. The pilot hole allows access to the cutterhead to address the machine jam. In this working condition, the slag gate 4 is in the open position, exposing the opening 2-1 and facilitating the excavation of the pilot hole at the opening 2-1 position.

[0054] In summary, the present invention opens and closes the opening 2 - 1 at the tail of the shield body 2 by controlling the telescopic movement of the slag blocking door 4 , can adapt to various strata, and improves the adaptability of the tunnel boring machine under different geological conditions.

[0055] In other embodiments of the tunnel boring machine main unit: the telescopic drive device can be replaced by a cylinder. In this case, the solenoid valve can still be used to control the telescopic movement of the cylinder piston rod, so that the slag retaining door can be switched between the blocking position and the opening position.

[0056] In other embodiments of the tunnel boring machine main unit: the telescopic drive device can also be replaced by an electric push rod. In this case, the electric push rod is connected to a controller, which controls the extension and retraction of the electric push rod, thereby switching the slag retaining door between the blocking position and the opening position.

[0057] In other embodiments of the tunnel boring machine main machine, two telescopic drive devices may be provided, respectively connected to the left and right ends of the slag blocking door.

[0058] In other embodiments of the tunnel boring machine main unit: the driving mechanism may not be a telescopic driving device that outputs linear motion. For example, a motor may be installed on the slag retaining door, and a gear may be installed at the output end of the motor. At the same time, a rack extending forward and backward is fixed on the inner wall of the shield body, and the gear is engaged with the rack. When the motor drives the gear to rotate, the slag retaining door can be driven forward and backward. At this time, the driving mechanism is a component that cooperates with each other and is arranged on the shield body and the slag retaining door.

[0059] In other embodiments of the tunnel boring machine main body: the driving mechanism can also be replaced by a screw and nut mechanism. In this case, a rotatable screw needs to be installed on the inner wall of the shield body, and a nut that cooperates with the screw needs to be fixed on the slag stop door. At the same time, a front and rear guide structure needs to be set between the slag stop door and the inner wall of the shield body. The screw is driven to rotate by the motor, which can drive the slag stop door to move forward and backward.

[0060] In other embodiments of the tunnel boring machine main body: the slag retaining door can be a box structure, the bottom surface of the box is a circular arc surface, the top surface is a plane, the front side and the rear side are both vertical surfaces, and the cross section of the box is a bad arc shape.

[0061] In other embodiments of the tunnel boring machine mainframe: when a guide rail is provided on the inner wall of the shield body to guide the slag retaining door, the guide groove can be directly provided on the guide rail, and the inner wall of the shield body is no longer used to form the guide groove.

[0062] In other embodiments of the tunnel boring machine main body: the guiding structure can also be a convex strip extending forward and backward provided in the middle of the outer side surface of the slag retaining door, and a groove extending forward and backward provided at the bottom of the inner wall of the shield body, the convex strip is embedded in the groove, and the two guide and cooperate.

[0063] In other embodiments of the tunnel boring machine mainframe, a guide structure may no longer be provided between the slag retaining door and the shield body, and the direction of movement of the slag retaining door is controlled solely by the direction of the output force of the driving mechanism.

[0064] In other embodiments of the tunnel boring machine main unit: the slag door can be switched between the blocking position and the opening position instead of moving forward and backward. For example, the left end or the right end of the slag door is hinged on the shield body, and a hinge shaft is fixed to the slag door, and the hinge axis extends in the front and rear direction. At this time, the slag door is opened by flipping to the left or right, and closed otherwise. At this time, the driving mechanism that controls the opening and closing of the slag door can be a motor, a reducer connected to the output end of the motor, and a driving gear installed at the output end of the reducer. At this time, a driven gear is installed on the hinge shaft, and the driving gear is engaged with the driven gear, which can drive the hinge shaft to rotate, thereby controlling the opening or closing of the slag door.

[0065] In other embodiments of the tunnel boring machine main unit: the slag retaining door can also be assembled on the inner wall of the shield body along a circumferential guide slide. At this time, the driving mechanism includes an arc-shaped rack arranged on the inner wall of the shield body, and a motor installed on the slag retaining door. A gear is installed at the output end of the motor, and the gear is engaged with the rack. When the motor drives the gear to rotate, the slag retaining door can be driven to rotate circumferentially, and can be rotated to a position where the opening is exposed or a position where the opening is blocked.

[0066] The embodiment of the internal telescopic shield of the tunnel boring machine in the present invention is as follows: the specific structure of the internal telescopic shield of the tunnel boring machine is the same as the internal telescopic shield in any embodiment of the tunnel boring machine host described above, and will not be repeated here.

[0067] The embodiment of the tunnel boring machine in the present invention is as follows: the tunnel boring machine includes a main machine and rear supporting equipment. The structure of the main machine is the same as any embodiment of the tunnel boring machine main machine described above, and will not be repeated here.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. An internal telescopic shield for a tunnel boring machine, comprising a shield body, the tail of which is provided with an opening for the bottom slag to enter the shield body when the shield is shifted, characterized in that: The inner telescopic shield also includes a slag blocking door movably mounted on the shield body. The slag blocking door has a blocking position for blocking the opening and an opening position for opening the opening during its movable stroke. A driving mechanism is installed on the shield body, which is connected to the slag blocking door to control the slag blocking door to switch between the blocking position and the opening position.

2. The inner telescopic shield of the tunnel boring machine according to claim 1, characterized in that: The axis of the shield body is defined to extend in the front-to-back direction, the slag blocking door is located on the inner side of the shield body, and the driving mechanism is used to control the forward and backward movement of the slag blocking door to switch between the blocking position and the opening position.

3. The inner telescopic shield of the tunnel boring machine according to claim 2, characterized in that: A guide structure for guiding the forward and backward movement of the slag blocking door is provided between the slag blocking door and the shield body.

4. The inner telescopic shield of the tunnel boring machine according to claim 3, characterized in that: The guide structure includes two guide rails fixed on the inner wall of the shield body and extending in the front-back direction. A guide groove for the end of the slag blocking door to extend into is provided on the guide rails or between the guide rails and the inner wall of the shield body.

5. The inner telescopic shield of a tunnel boring machine according to any one of claims 1 to 4, characterized in that: The slag retaining door is an arc-shaped plate concentric with the shield body.

6. The inner telescopic shield of a tunnel boring machine according to any one of claims 2 to 4, characterized in that: The driving mechanism is a telescopic driving device for outputting linear motion, one end of the telescopic driving device is hinged to the inner wall of the shield body, and the other end is hinged to the slag blocking door.

7. The inner telescopic shield of the tunnel boring machine according to claim 6, characterized in that: There is only one telescopic drive device, the hinge point between the telescopic drive device and the inner wall of the shield body is located at the bottom of the inner wall of the shield body, and the hinge point between the telescopic drive device and the slag blocking door is located in the middle between the left and right ends of the slag blocking door.

8. The inner telescopic shield of the tunnel boring machine according to claim 6, characterized in that: The telescopic drive device is a telescopic oil cylinder. The hydraulic system connected to the telescopic oil cylinder includes a solenoid valve for controlling the extension and retraction of the piston rod of the telescopic oil cylinder to switch the slag blocking door between the blocking position and the opening position.

9. A tunnel boring machine mainframe, comprising an outer telescopic shield, an inner telescopic shield and a support shield, characterized in that: The inner telescopic shield is the inner telescopic shield of the tunnel boring machine according to any one of claims 1 to 8.

10. A tunnel boring machine, comprising a main machine and supporting equipment, wherein the main machine comprises an outer telescopic shield, an inner telescopic shield and a support shield, characterized in that: The inner telescopic shield is the inner telescopic shield of the tunnel boring machine according to any one of claims 1 to 8.

Images