Sealing wear detection and automatic compensation device for main drive of shield tunneling machine
By designing seal wear detection and automatic compensation devices in the main drive of the shield machine, and using sealed airbags and detection devices to achieve automatic compensation of seal compression, the problem of wear of seal performance of the main drive of the shield machine is solved, the life of the seal and wear-resistant ring is extended, and the balance between the main drive and the soil silo pressure is protected.
Patent Information
- Application Number
- CN202422120976.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-30
AI Technical Summary
The sealing performance of the main drive of the existing shield machine is accelerated by the lip seal and wear-resistant ring due to the soaking of sand and soil. In severe cases, mud and sand will penetrate into the main drive, causing wear of bearings and gears, affecting the life of the main drive and tunnel excavation progress.
A seal wear detection and automatic compensation device for main drive of shield machine is designed, and a sealed airbag is used instead of traditional grease. The pressure change in the sealed airbag is detected through the detection device, and the seal compression amount is automatically compensated to ensure that the seal is within a constant pressure range.
Automatic compensation for seals is achieved, extending the service life of seals and wear-resistant rings, preventing silt and sand from seeping into the main drive, protecting the main drive from damage, and maintaining the balance of the pressure of the soil silo.
Smart Images
Figure CN222963333U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shield machines, and particularly relates to a sealing wear detection and automatic compensation device for the main drive of a shield machine. Background Technique
[0002] The main drive of a shield machine occupies an important position in the composition of the shield machine and is the core component of the shield machine. The sealing performance of the main drive directly affects the service life of the main drive of the shield machine, as well as the tunneling progress and ability. During the tunneling process of the shield machine, the main drive seal has the following two functions:
[0003] 1) Earth pressure balance function: When the shield machine is tunneling, when the internal pressure of the earth pressure chamber reaches about 5 bar, the main drive seal can always keep the earth pressure from leaking at the main drive when the cutter head and the main drive are rotating, maintaining the earth pressure balance to prevent the collapse of the working face from affecting the tunneling progress.
[0004] 2) Main drive protection function: The internal bearings and gears of the main drive are very precise and expensive. During the tunneling of the shield machine, the environment on the earth pressure chamber side of the main drive is harsh, and the earth pressure chamber is filled with sediment. The seal of the main drive can effectively prevent the sediment from penetrating into the main drive bearing, ensuring the smooth rotation of the main drive and extending the service life of the main drive.
[0005] In the existing main drive of a shield machine, the main drive seal is composed of multiple lip seals, and grease is injected between every two seals to improve the sealing performance. The cross-sectional height of the lip seal and the thickness of the wear-resistant ring on the sealing contact surface are fixed dimensions. During the tunneling process of the shield machine, since the sand on the earth pressure chamber side has been soaking the outermost lip seal and the wear-resistant ring, due to the existence of sand and gravel between the seal and the wear-resistant ring, the wear of the lip seal and the sealing wear-resistant ring is accelerated. When the wear is serious, if the seal cannot be repaired and replaced in time and the wear-resistant ring cannot be repaired when leaving the tunnel, it will cause sediment to penetrate into the main drive, resulting in serious wear of the internal bearings and gears of the main drive. Seriously, it will cause the main drive torque to be too large and damage the drive system. Due to space and environmental limitations, it is completely impossible to replace the seal on the earth pressure chamber side. The scrapping of the main drive due to seal damage will directly affect the construction period.
[0006] Therefore, the present invention provides a sealing wear detection and automatic compensation device for the main drive of a shield machine to solve the above problems. Content of the Utility Model
[0007] Technical problems to be solved by the present utility model: In the existing shield machine, grease is injected between two seals to enhance the sealing performance. However, since the sandy soil on one side of the soil bin continuously immerses the outermost lip seal and wear-resistant ring, the presence of sand and gravel between the seal and the wear-resistant ring accelerates the wear of the lip seal and the seal wear-resistant ring. When the wear is severe, if the seal cannot be repaired and replaced in time when exiting the tunnel and the wear-resistant ring cannot be repaired, sediment will seep into the main drive, resulting in severe wear of the bearings and gears inside the main drive. In serious cases, the torque of the main drive will be too large, damaging the drive system.
[0008] The present utility model provides the following technical solutions: A seal wear detection and automatic compensation device for the main drive of a shield machine, including a seal wear-resistant ring, a lip seal, and a seal mounting seat. A groove for placing the lip seal is formed inside the seal mounting seat. The lip seal is installed inside the seal mounting seat, and a seal wear-resistant ring is installed on the left side of the lip seal. It further includes a compensation device and a detection device. The compensation device is installed on the right side of the lip seal and is used to automatically compensate the seal compression amount when the wear amount of the wear-resistant ring reaches a certain value. The detection device is installed on the right side of the compensation device and is used to detect the hydraulic pressure inside the compensation device and then flush the compensation device with liquid.
[0009] Preferably, the compensation device includes a seal airbag, a hydraulic oil pipe, and a hydraulic oil pump. The seal airbag is installed on the right side of the lip seal. One end of the hydraulic oil pipe is connected to the seal airbag, and the other end of the hydraulic oil pipe is installed with a hydraulic oil pump.
[0010] Preferably, the detection device includes an electric ball valve, a pressure sensor, and a control CPU. Both the electric ball valve and the pressure sensor are installed at the position where the hydraulic oil pipe extends out of the seal mounting seat. The control CPU is installed in the control room and is signal-connected to the pressure sensor and the electric ball valve.
[0011] Preferably, the pressure sensor is located on the left side of the electric ball valve.
[0012] The beneficial effects of the present utility model are as follows:
[0013] 1. By setting the compensation device, the present utility model uses a seal airbag to replace traditional grease to compensate each seal on the shield machine, so as to automatically compensate the seal compression amount when the wear amount of the seal and the seal wear-resistant ring reaches a certain value, thereby enabling the seal to maintain within a constant pressure range, further protecting the main drive from damage and maintaining the balance of the soil bin pressure.
[0014] 2. The utility model detects the pressure change in the sealing airbag through a detection device, thereby detecting the wear amount of the seal, and compensates the sealing balloon by opening or closing the electric ball valve, thereby ensuring the stability of the sealing mechanism. Description of the Drawings
[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0016] Figure 1 It is a structural diagram of the compensation device of the present utility model;
[0017] Figure 2 It is a structural diagram of the detection device of the present utility model;
[0018] Figure 3 It is a control schematic diagram of the present utility model.
[0019] In the figure: 1, sealing wear-resistant ring; 2, lip seal; 3, seal mounting seat; 4, compensation device; 41, sealing airbag; 42, hydraulic oil pipe; 43, hydraulic oil pump; 5, detection device; 51, electric ball valve; 52, pressure sensor; 53, control CPU. Specific Embodiments
[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the present utility model claimed, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0021] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "back", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. Such terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0023] It should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] The embodiments of the present disclosure aim to solve the problem that the existing shield machine injects grease between two seals to increase the sealing performance. However, since the sand on the soil bin side has been soaking the outermost lip seal and wear-resistant ring, the presence of sand and gravel between the seal and the wear-resistant ring has accelerated the wear of the lip seal and the seal wear-resistant ring. When the wear is serious, if the seal cannot be repaired and replaced and the wear-resistant ring cannot be repaired in time when leaving the tunnel, it will cause sediment to penetrate into the main drive, resulting in serious wear of the bearings and gears inside the main drive. Seriously, it will cause the torque of the main drive to be too large and damage the drive system. In view of this, the embodiments of the present disclosure propose a device for detecting and automatically compensating for the wear of the seal of the main drive of a shield machine. This device uses a sealed airbag to replace the traditional grease to compensate for each seal on the shield machine, so as to automatically compensate the seal compression amount when the wear amount of the seal and the seal wear-resistant ring reaches a certain value, so as to achieve that the seal can be maintained within a constant pressure range, thereby protecting the main drive from damage and maintaining the balance of the soil bin pressure.
[0025] Such as Figures 1 to 3As shown in the figure, a sealing wear detection and automatic compensation device for the main drive of a shield machine includes a sealing wear-resistant ring 1, a lip seal 2, and a sealing mounting seat 3. A groove for placing the lip seal 2 is provided in the sealing mounting seat 3. A groove is machined at the corresponding position of the sealing mounting seat 3 for installing a sealing airbag 41. A hole is drilled in the radial position of the groove for externally connecting a hydraulic oil pipe 42. The lip seal 2 is installed in the sealing mounting seat 3, and the sealing wear-resistant ring 1 is installed on the left side of the lip seal 2. It further includes a compensation device 4 and a detection device 5. The compensation device 4 is installed on the right side of the lip seal 2 and is used to automatically compensate the sealing compression amount when the wear amount of the wear-resistant ring reaches a certain value. The detection device 5 is installed on the right side of the compensation device 4 and is used to detect the hydraulic pressure in the compensation device 4 and then fill the compensation device 4 with liquid.
[0026] By adopting the above compensation device 4 and detection device 5, when the wear amounts of the seal and the sealing wear-resistant ring 1 reach a certain value, the sealing compression amount can be automatically compensated, so that the seal can be maintained within a constant pressure range, thereby protecting the main drive from damage and maintaining the balance of the soil chamber pressure.
[0027] As Figure 1 shown in the figure, the compensation device 4 includes a sealing airbag 41, a hydraulic oil pipe 42, and a hydraulic oil pump 43. The sealing airbag 41 is installed on the right side of the lip seal 2 and is installed at the joint of the groove of the lip seal 2 and the gap of the lip seal 2. An interface is provided on the outer surface of the sealing airbag 41 for introducing hydraulic oil. One end of the hydraulic oil pipe 42 is connected to the sealing airbag 41, and the other end of the hydraulic oil pipe 42 is installed with a hydraulic oil pump 43. The hydraulic oil pump 43 is used to introduce and output hydraulic oil into the sealing airbag 41 to realize the pressure detection and expansion and contraction functions of the sealing airbag 41.
[0028] The sealing airbag 41 is used to replace the traditional grease to compensate each seal on the shield machine, so that when the wear amounts of the seal and the sealing wear-resistant ring 1 reach a certain value, the sealing compression amount can be automatically compensated, so that the seal can be maintained within a constant pressure range, thereby protecting the main drive from damage and maintaining the balance of the soil chamber pressure.
[0029] As Figures 2 to 3As shown in the figure, the detection device 5 includes an electric ball valve 51, a pressure sensor 52, and a control CPU 53. The electric ball valve 51 and the pressure sensor 52 are both installed at the position where the hydraulic oil pipe 42 extends out of the sealed mounting seat 3. The electric ball valve 51 is used to receive the control signal from the CPU to realize the opening and closing function of the hydraulic pipeline. The pressure sensor 52 functions to detect the pressure value in the sealed airbag 41 in the whole system and send the detected value to the control CPU 53. The control CPU 53 is installed in the control room and is signal-connected to the pressure sensor 52 and the electric ball valve 51. When the control CPU 53 receives the signal sent by the pressure sensor 52, it opens or closes the electric ball valve 51 of this circuit.
[0030] With the above detection device 5, the pressure change in the sealed airbag 41 is detected by the pressure sensor 52, and then the wear amount of the seal is detected. The sealed balloon is compensated by opening or closing the electric ball valve 51, thus ensuring the stability of the sealing mechanism.
[0031] As Figure 2 shown in the figure, the pressure sensor 52 is located on the left side of the electric ball valve 51. Installing the pressure sensor 52 on the left side of the electric ball valve 51 is to enable the pressure sensor 52 to monitor the pressure change in the sealed airbag 41 in real time and send the signal into the control CPU 53.
[0032] The overall working process is as follows: The lip seal 2 is installed in the sealed mounting seat 3, the sealed airbag 41 is installed at the gap between the lip seal 2 and the sealed mounting seat 3. The sealed airbag 41 is externally connected to a hydraulic pipeline. The pressure sensor 52 is connected to the hydraulic oil pipe 42, and the electric ball valve 51 acts in response to the feedback signal from the pressure sensor 52. The electric ball valve 51 is usually in the closed state. When the sealing lip and the sealing wear-resistant ring 1 are worn, the pressure sensor 52 detects that the pressure in the sealed airbag 41 decreases. The signal sent by the pressure sensor 52 is received by the control CPU 53, and the control CPU 53 sends an instruction to the electric ball valve 51 to open the electric ball valve 51, so that the hydraulic oil flows into the sealed airbag 41. When the pressure sensor 52 reaches a fixed value, the signal is received by the control CPU 53, and the CPU sends an instruction to the electric ball valve 51 to close the electric ball valve 51. Each component acts as described above, and finally the purpose of automatic compensation of the seal height is achieved.
[0033] Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A seal wear detection and automatic compensation device for a main drive of a shield machine, comprising a seal wear-resistant ring (1), a lip seal (2), and a seal mounting seat (3), wherein a groove for placing the lip seal (2) is provided in the seal mounting seat (3), the lip seal (2) is mounted in the seal mounting seat (3), and a seal wear-resistant ring (1) is mounted on the left side of the lip seal (2); characterized in that: It also includes a compensation device (4) and a detection device (5), wherein the compensation device (4) is installed on the right side of the lip seal (2), and the compensation device (4) is used to automatically compensate for the seal compression when the wear of the wear-resistant ring reaches a certain value; the detection device (5) is installed on the right side of the compensation device (4), and the detection device (5) is used to detect the hydraulic pressure in the compensation device (4) and then flush the compensation device (4).
2. A seal wear detection and automatic compensation device for main drive of a shield machine according to claim 1, characterized in that: The compensation device (4) comprises a sealing airbag (41), a hydraulic oil pipe (42) and a hydraulic oil pump (43); the sealing airbag (41) is installed on the right side of the lip seal (2); one end of the hydraulic oil pipe (42) is connected to the sealing airbag (41); and the other end of the hydraulic oil pipe (42) is installed with the hydraulic oil pump (43).
3. A seal wear detection and automatic compensation device for main drive of a shield machine according to claim 2, characterized in that: The detection device (5) comprises an electric ball valve (51), a pressure sensor (52) and a control CPU (53). The electric ball valve (51) and the pressure sensor (52) are both installed at a position where the hydraulic oil pipe (42) extends out of the sealing mounting seat (3). The control CPU (53) is installed in a control room and is connected to the pressure sensor (52) and the electric ball valve (51) via a signal.
4. A seal wear detection and automatic compensation device for main drive of a shield machine according to claim 3, characterized in that: The pressure sensor (52) is located on the left side of the electric ball valve (51).