A waterproof structure for an electrical control box of a shaft sinking machine

Abstract

The utility model relates to sinking well construction equipment technical field, concretely relates to a waterproof structure for vertical shaft heading machine electric control box, including the box body for containing electric control part, with the box cover of cover combination of adaptation, and the cable sealing assembly for cable wear and tear seal, cable sealing assembly is correspondingly set at the cable incoming line port and / or outgoing line port of box body, is used for blocking water along the gap of cable and box port and penetrates into the box. For the thicker incoming line / outgoing line cable, adopt rigid sealing structure of sealing flange body + flange cover, and give consideration to sealing reliability and the fixed demand of thick cable, for thin cable, adopt the flexible sealing scheme of "end straight through joint + polyurethane rubber tube + buckle pressure type hose joint", both satisfy thin cable's flexible wear and tear, and guarantee port sealing performance. Two kinds of structures can be flexibly selected according to the actual cable specification of electric control box, cover vertical shaft heading machine electric control box all kinds of cable connection scene, and the commonality is strong.

Description

Technical Field

[0001] This utility model relates to the field of caisson construction equipment technology, specifically to a waterproof structure for the electrical control box of a vertical shaft excavator. Background Technology

[0002] Shaft boring machines (TBMs), as a new type of shaft construction equipment that combines safety, efficiency, and environmental friendliness, need to operate at depths of tens of meters underground. To balance groundwater pressure and prevent surrounding ground subsidence, water must be injected into the tunnel lining segments during construction. This means that the TBM's main cables and electrical control boxes are constantly submerged underwater. Especially in shafts deeper than 30 meters, water pressure can reach 3-10 bar. If existing electrical control boxes lack adequate anti-corrosion design and reliable sealing structures, they are highly susceptible to water ingress, leading to serious malfunctions such as equipment shutdown and component damage.

[0003] In view of this, in order to overcome the above-mentioned technical problems, this utility model designs and develops a waterproof structure for the electrical control box of a vertical shaft tunneling machine, thus solving the above-mentioned technical problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model proposes a waterproof structure for the electrical control box of a shaft boring machine. This solves the technical problem that in existing technologies, the main cable and electrical control box of a shaft boring machine are constantly immersed in water during operation, especially at depths exceeding 30 meters and water pressures reaching 3-10 bar. Due to the lack of a sound anti-corrosion design and a reliable sealing structure, the existing electrical control box is prone to water ingress, which can lead to serious malfunctions such as equipment shutdown and component damage.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a waterproof structure for an electrical control box of a vertical shaft tunneling machine, including a box body for accommodating electrical control components, a box cover adapted to fit the box body, and a cable sealing assembly for sealing the cable passage; at least two box cover seals are provided between the mating surfaces of the box body and the box cover, and the box cover is fastened to the box body by bolts to compress the box cover seal, thereby achieving a seal between the box body and the box cover mating surfaces; the cable sealing assembly is correspondingly provided at the cable inlet port and / or outlet port of the box body to prevent water from seeping into the box body along the gap between the cable and the box body port.

[0006] Preferably, the tank is made of stainless steel and is formed by welding. After the tank is processed, its sealing performance is verified by a pressure test, with a test pressure of not less than 10 bar, to match the actual working water pressure of 3-10 bar when the vertical shaft depth is >30m.

[0007] Preferably, the cable sealing assembly includes: a sealing flange body and a sealing flange cover. The sealing flange body is fixed to the cable port of the housing by welding, and the weld is inspected for sealing performance after welding. A radial seal and two axial seals are provided between the mating surfaces of the sealing flange cover and the sealing flange body. The radial seal is arranged along the circumference of the cable. The sealing flange cover is fastened to the sealing flange body by bolts to ensure that the radial seal and the axial seal are fully fitted.

[0008] Preferably, an annular gap is formed between the sealing flange body, the sealing flange cover and the cable, and waterproof adhesive is injected into the annular gap. The waterproof adhesive is an epoxy resin adhesive compatible with the cable insulation layer, and the injection depth is 60mm. After the waterproof adhesive cures, a fixed sealing layer is formed.

[0009] Preferably, the cable sealing assembly includes: a straight-through connector, a rubber tube, and a flexible hose connector; the cable port of the housing is threaded, the straight-through connector is matched with the pipe thread, and the threaded connection surface is coated with polytetrafluoroethylene sealant; the rubber tube is sleeved on the outside of the cable, its inner diameter is slightly larger than the outer diameter of the cable, one end of the rubber tube is fixed to the flexible hose connector by a crimping process, the flexible hose connector and the straight-through connector are detachably connected, and an O-ring is provided at the connection point between the two.

[0010] Preferably, the hose is a water-pressure resistant and wear-resistant polyurethane hose, and the length of the hose is adapted to the wiring requirements of the cable inside the box, so that the cable end can extend to the preset wiring position inside the box.

[0011] Preferably, the lid seal is made of water-resistant and aging-resistant nitrile rubber, and the lid is evenly fastened to the box body with bolts to ensure that the lid seal is evenly compressed without local gaps.

[0012] Preferably, both the radial seal and the axial seal are made of elastic materials suitable for high water pressure environments, which can maintain sealing performance under water pressure of 3-10 bar and prevent water from seeping in along the flange mating surface.

[0013] In summary, this utility model has the following beneficial effects: Firstly, this structure is designed for extreme working conditions with shaft depths greater than 30 meters and water pressures of 3-10 bar. It employs a composite waterproofing solution of "multiple seals + glue reinforcement" (such as two water-resistant nitrile rubber seals between the cover and the body, radial and axial double seals with 60mm deep epoxy resin injection at the thick cable seal, and double leak prevention at the thin cable end with thread sealant and O-ring seal). Combined with a pressure test of no less than 10 bar before the box leaves the factory, it can achieve 24-48 hours of underwater immersion without leakage, completely blocking the path of water seepage along cable gaps and box joint surfaces. This avoids serious malfunctions such as equipment shutdown and component damage caused by water ingress in traditional electrical control boxes, ensuring continuous and stable operation of the shaft boring machine.

[0014] Secondly, the enclosure is made of stainless steel and welded together. Utilizing the excellent corrosion resistance of stainless steel, it can withstand the erosion of various corrosive media in groundwater. At the same time, the sealing components (such as nitrile rubber seals and polyurethane hoses) are all made of water-resistant and aging-resistant materials to avoid seal failure or enclosure corrosion caused by long-term underwater immersion. This significantly reduces corrosion and wear of the electrical control box, extends the service life of the overall equipment, and reduces the frequency of replacement and maintenance of downhole equipment.

[0015] Thirdly, it adapts to cables of different diameters, offering strong versatility and scenario coverage: Two targeted implementation methods are used to adapt to cables of different specifications. For thicker incoming / outgoing cables, a rigid sealing structure of a sealed flange body + flange cover is adopted, balancing sealing reliability with the need for fixing thicker cables. For thinner cables, a flexible sealing solution of "end straight connector + polyurethane hose + crimped flexible hose connector" is used, satisfying both the flexible installation of thinner cables and ensuring port sealing performance. Both structures can be flexibly selected according to the actual cable specifications of the electrical control box, covering various cable connection scenarios for shaft boring machine electrical control boxes, demonstrating strong versatility.

[0016] Fourth, the structure is reliable and easy to maintain, reducing construction and operation costs: The sealing components of this structure (such as flange bolts, hose connectors, and end straight connectors) all adopt a standardized and detachable design. Installation requires no complex special tools; assembly can be completed simply by tightening bolts and crimping connections. Furthermore, all seals and the enclosure structure have undergone operational testing, demonstrating strong aging resistance and wear resistance, reducing the frequency of daily maintenance. In addition, the connection points between the enclosure and the sealing components (such as welds and threaded interfaces) undergo sealing checks, reducing later operation and maintenance risks from the outset and indirectly reducing construction delay costs caused by equipment failure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the box body in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the internal structure of the box in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the radial and axial sealing installation in Embodiment 1 of this utility model; Figure 4 This is a front view of the box body in Embodiment 2 of this utility model; Figure 5 This is a schematic diagram of the internal structure of the box in Embodiment 2 of this utility model.

[0019] In the diagram: 1. Box body; 2. Sealing flange body; 3. Sealing flange cover; 4. Radial seal; 5. Axial seal; 6. Box cover; 7. Box cover seal; 8. Incoming cable; 9. Outgoing cable; 11. Thin cable; 12. Rubber hose; 13. Flexible hose connector; 14. End straight connector. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0023] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] like Figure 1-3 As shown, Example 1: Waterproof structure for incoming and outgoing cables (suitable for thicker cables).

[0025] This embodiment is applicable to the waterproof connection between the electrical control box of a vertical shaft tunneling machine and the incoming cable 8 and outgoing cable 9, and is suitable for cables with larger diameters. The specific implementation process is as follows: Preparation for assembly of the enclosure and lid: Stainless steel is selected as the raw material for enclosure 1. After being processed and formed by welding, enclosure 1 undergoes a pressure test (the test pressure matches the actual working water pressure of the vertical shaft, usually not less than 10 bar) to ensure that enclosure 1 itself has no weld gaps and leaks, while utilizing the anti-corrosion properties of stainless steel. Prepare a lid 6 that fits enclosure 1, and pre-install two lid seals 7 at the mating surfaces of lid 6 and enclosure 1 (the seals 7 are made of water-resistant and aging-resistant rubber, such as nitrile rubber), to ensure basic sealing performance of the mating surfaces.

[0026] Sealing flange installation: Fix the sealing flange 2 to the cable inlet / outlet port of the enclosure 1 by welding. During the welding process, ensure that the weld is full and there is no false weld. After the welding is completed, check the sealing of the welded part again to avoid water leakage due to welding defects.

[0027] Cable installation and sealing flange assembly: Pre-treat the ends of the incoming cable 8 and outgoing cable 9 (remove excess insulation and retain the necessary wiring length), and pass them through the corresponding channels of the sealing flange body 2, extending the cable ends to the pre-reserved wiring positions inside the enclosure 1. Then, take the sealing flange cover 3 and install one radial seal 4 and two axial seals 5 sequentially on its mating surface with the sealing flange body 2 (the radial seals are set around the circumference of the cable, and the axial seals are set along the mating surface of the flange cover 3 and the flange body 2; all seals are made of elastic material suitable for high water pressure environments). Secure the sealing flange cover 3 and the sealing flange body 2 with bolts, ensuring that the radial seal 4 and axial seal 5 are completely fitted without gaps.

[0028] Encapsulation sealing process: After the sealing flange cover 3 is fixed, inject waterproof adhesive (use water-resistant, aging-resistant epoxy resin adhesive that is compatible with the cable insulation layer) into the annular gap formed between the sealing flange body 2, the sealing flange cover 3 and the incoming cable 8 and the outgoing cable 9. The injection depth is controlled at 60mm to ensure that the gap is completely filled with waterproof adhesive. After the waterproof adhesive cures, a fixed waterproof sealing layer is formed, blocking the path of water to seep into the interior of the box 1 along the circumference of the cable.

[0029] Overall sealing verification: The assembled electrical control box (including the connection between the box cover 6 and the box body 1, and the box cover 6 is evenly tightened with bolts to ensure that the two box cover seals 7 are fully compressed) is placed in a water pressure test device simulating the working environment of a vertical shaft. After soaking for 24 hours, check whether water has entered the inside of the box body 1. After confirming that there is no leakage, it can be put into use for vertical shaft construction. It is suitable for working scenarios with a depth > 30m and a water pressure of 3-10 bar.

[0030] like Figure 4-5 As shown, Example 2: Waterproof structure adapted for thinner cables.

[0031] This embodiment is applicable to waterproofing the connection between the electrical control box of a vertical shaft tunneling machine and the thin cable 11. It is suitable for cables with smaller diameters and achieves sealing through pipeline protection. The specific implementation process is as follows: Assembly of enclosure and end straight connector: Select enclosure 1 that is compatible with thin cable 11, and process pipe threads at the cable inlet port of enclosure 1 (the thread specification matches the end straight connector 14). Fix the end straight connector 14 to the pipe thread port of enclosure 1 by thread connection. During the thread connection process, apply waterproof sealant (such as polytetrafluoroethylene sealant) to the thread surface to ensure that there is no leakage between the end straight connector 14 and enclosure 1 through thread gaps.

[0032] Assembly of the hose and cable: Prepare a hose 12 of suitable length (select a water-pressure resistant and wear-resistant polyurethane flexible hose, with an inner diameter slightly larger than the outer diameter of the thin cable 11). After pre-treating the end of the thin cable 11, insert it into one end of the hose 12, so that the end of the thin cable 11 protrudes from the other end of the hose 12 (the length meets the wiring requirements inside the enclosure 1). Take the hose connector 13 and connect and fix the protruding end of the hose 12 to the hose connector 13 using a crimping process, ensuring that there is no looseness or gap between the hose 12 and the hose connector 13.

[0033] Connection and sealing between pipeline and enclosure: Connect the assembled thin cable 11 and hose connector 13 to the end straight connector 14 on the enclosure 1 through the hose connector 13 (using threaded or quick coupling, depending on the actual working conditions). During the connection process, check whether the mating surfaces of the connectors fit together. If necessary, add an O-ring to ensure the reliability of the seal between the hose 12 and the end straight connector 14.

[0034] Sealing assembly of lid and body: Referring to the lid assembly method in Example 1, two lid seals 7 are pre-installed at the mating surface of the body 1 and lid 6. The lid 6 is evenly tightened with bolts to fully compress the lid seals 7 and ensure the sealing effect of the mating surface of the body 1 and lid 6.

[0035] Actual working condition verification: The assembled electrical control box was placed in an environment simulating a vertical shaft with a water pressure of 3-10 bar and tested continuously for 48 hours. The joints of the thin cable 11 and the hose 12, the connection between the end straight connector 14 and the box body 1, and the joint between the box cover 6 and the box body 1 were observed to check for water leakage. After confirming that there was no leakage, it can be used for waterproof electrical control connection of thin cables in vertical shaft tunneling machines, meeting the requirements for long-term underwater immersion.

[0036] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A waterproof structure for the electrical control box of a shaft boring machine, characterized in that, The enclosure includes a housing (1) for housing electrical control components, a cover (6) adapted to fit the housing (1), and a cable sealing assembly for sealing the cable passage. At least two cover seals (7) are provided between the mating surfaces of the housing (1) and the cover (6). The cover (6) is fastened to the housing (1) by bolts to compress the cover seals (7) and achieve a seal between the mating surfaces of the housing (1) and the cover (6). The cable sealing assembly is correspondingly provided at the cable inlet port and / or outlet port of the housing (1) to prevent water from seeping into the housing (1) through the gap between the cable and the port of the housing (1).

2. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 1, characterized in that, The box (1) is made of stainless steel and is formed by welding. After the box (1) is processed, the sealing performance is verified by pressure test. The test pressure is not less than 10 bar to match the actual working water pressure of 3-10 bar when the vertical shaft depth is >30m.

3. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 1, characterized in that, The cable sealing assembly includes a sealing flange body (2) and a sealing flange cover (3). The sealing flange body (2) is fixed to the cable port of the housing (1) by welding. After welding, the weld is checked for sealing performance. A radial seal (4) and two axial seals (5) are provided between the mating surfaces of the sealing flange cover (3) and the sealing flange body (2). The radial seal (4) is arranged along the circumference of the cable. The sealing flange cover (3) is fastened to the sealing flange body (2) by bolts so that the radial seal (4) and the axial seal (5) fit together fully.

4. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 3, characterized in that, An annular gap is formed between the sealing flange body (2), the sealing flange cover (3) and the cable being laid. Waterproof adhesive is injected into the annular gap. The waterproof adhesive is an epoxy resin adhesive compatible with the cable insulation layer. The injection depth is 60mm. After the waterproof adhesive cures, a fixed sealing layer is formed.

5. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 1, characterized in that, The cable sealing assembly includes: a straight-through connector (14), a rubber tube (12), and a flexible hose connector (13); the cable port of the housing (1) is threaded, the straight-through connector (14) is matched with the pipe thread, and the threaded connection surface is coated with polytetrafluoroethylene sealant; the rubber tube (12) is sleeved on the outside of the cable, and its inner diameter is slightly larger than the outer diameter of the cable. One end of the rubber tube (12) is fixed to the flexible hose connector (13) by a crimping process. The flexible hose connector (13) and the straight-through connector (14) are detachably connected, and the connection part of the two is provided with an O-ring seal.

6. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 5, characterized in that, The hose (12) is a water pressure resistant and wear resistant polyurethane hose. The length of the hose (12) is adapted to the wiring requirements of the cable in the box (1), so that the cable end can extend to the preset wiring position in the box (1).

7. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 1, characterized in that, The box cover seal (7) is made of water-resistant and aging-resistant nitrile rubber. The box cover (6) is evenly fastened to the box body (1) by bolts to ensure that the box cover seal (7) is evenly compressed without local gaps.

8. The waterproof structure for the electrical control box of a vertical shaft tunneling machine according to claim 3, characterized in that, Both the radial seal (4) and the axial seal (5) are made of elastic material suitable for high water pressure environments, and can maintain sealing performance under water pressure of 3-10 bar to prevent water from seeping in along the flange mating surface.

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