Explosion-proof brake

Abstract

An anti-explosion brake comprises a brake base, a working box is arranged on the brake base, static iron core assemblies are fixedly arranged at the two ends of the working box respectively, static iron cores are arranged in the static iron core assemblies, spigots are formed in the peripheries of the static iron core assemblies, O-shaped sealing rings are arranged between the spigots and the working box, and coil assemblies are arranged in the working box. Movable iron core assemblies are arranged in the coil assembly, the outer sides of the two movable iron core assemblies are respectively connected with a guide shaft, the guide shafts outwards penetrate through the static iron core assembly, and oilless sliding bearings are arranged between the guide shafts and the static iron core assembly. Static iron core assemblies at the two ends of the barrel are sealed through spigots and O-shaped sealing rings, carbon-based oilless sliding bearings are arranged between the guide shafts and the static iron cores, the guide shafts are made of abrasion-resistant and corrosion-resistant stainless steel materials, and the sealing effect is good. The working box and the junction box are divided into two cavities which are filled with epoxy resin in a pouring sealing mode, so that the two cavities are mutually sealed, and the safety of the system is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to elevators, and especially to an explosion-proof brake. Background Art

[0002] In the elevator industry, the performance and safety of brakes are crucial. During the design and manufacturing process of traditional brakes, problems such as poor sealing performance, insufficient wear resistance, and high maintenance costs are often faced. Especially in explosion-proof elevators, stricter requirements are imposed on the brakes, which need to be able to operate safely in explosive gas or dust environments and possess high reliability and durability. In the prior art, there are certain limitations in the design of the sealing structure of explosion-proof brakes. For example, there is a lack of an effective sealing structure between the wiring box and the working box of the explosion-proof brake, which affects its safe operation. Additionally, the sliding components of some brakes are made of ordinary materials, with insufficient wear resistance, and are prone to wear and heat generation during the friction process, affecting the stability and service life of the brakes. Summary of the Invention

[0003] The purpose of the utility model is to provide an explosion-proof brake, and the explosion-proof brake is required to solve the technical problems of the lack of an effective sealing structure between the wiring box and the working box in the prior art, as well as insufficient wear resistance and sealing of the sliding components.

[0004] An explosion-proof brake of the utility model includes a brake seat, a working box is arranged on the brake seat, static iron core assemblies are fixedly arranged at both ends of the working box respectively, a static iron core is arranged in the static iron core assemblies, a stop is arranged on the outer periphery of the static iron core assemblies, an O-ring seal is arranged between the stop and the working box, a partition is arranged in the working box, a coil assembly is arranged on each side of the partition, a moving iron core assembly is arranged in each of the two coil assemblies, the moving iron core assembly and the coil assembly form an axial sliding pair, springs are respectively arranged between the two moving iron core assemblies and the partition, the springs bias the moving iron core assemblies inward, guide shafts are respectively connected to the outer sides of the two moving iron core assemblies, the guide shafts pass through the static iron core assemblies outward, and an oil-free sliding bearing is arranged between the guide shafts and the static iron core assemblies; a wiring box is arranged on the working box, the working box and the wiring box are hermetically separated from each other, a wiring row is arranged in the wiring box, wiring terminals are arranged on the wiring row, an electrical clearance and a creepage distance are arranged between the wiring terminals, the wiring terminals are connected with cables, a through hole is arranged between the wiring box and the working box, a rubber pad with a wire passing hole is arranged in the through hole, the cables pass through the wire passing holes and are connected with the coil assemblies, and a sealing structure is arranged in the through hole.

[0005] Further, the working box is composed of seamless steel pipes.

[0006] Further, a rubber cover is sleeved on the outer side of the static iron core assembly and on the guide shaft.

[0007] Further, the guiding shaft is made of S30408 stainless steel material.

[0008] Further, the sealing structure is epoxy resin.

[0009] Further, a cable inlet and outlet are provided on the side wall of the junction box, and a cable introducing device with a sealing ring is provided in the cable inlet and outlet.

[0010] Further, a box cover is provided on the junction box, and a rubber sealing gasket is provided between the box cover and the junction box.

[0011] Compared with the prior art, the effects of the present utility model are positive and obvious.

[0012] 1. The static iron core assemblies at both ends of the cylinder body are sealed with a spigot and an O-ring. A carbon-based oil-free sliding bearing is provided between the guiding shaft and the static iron core. The guiding shaft is made of wear-resistant and corrosion-proof stainless steel material, with good sealing effect. When the brake is working or the brake is manually released with a brake release wrench, the system is safer.

[0013] 2. The working box and the junction box are divided into two chambers. A rubber gasket with a wire threading hole is provided in the through hole between the junction box and the working box. After wiring is completed, it is filled with epoxy resin for pouring to seal the two chambers from each other, greatly improving the safety of the system.

[0014] 3. Sufficient electrical clearance and creepage distance are left between the terminal blocks, making the wiring row safer.

[0015] 4. The junction box cover uses a rubber sealing gasket to seal the junction box.

[0016] 5. The cable inlet and outlet use a cable introducing device with a sealing ring to improve the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of an explosion-proof brake of the present utility model.

[0018] Figure 2 It is a schematic side view of an explosion-proof brake of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below in conjunction with embodiments, but the present utility model is not limited to these embodiments. Any similar structure and its similar changes using the present utility model shall be included in the protection scope of the present utility model. The use of directions such as up, down, front, back, left, and right in the present utility model is only for convenient and clear description, and is not a limitation on the technical solution of the present utility model.

[0020] Such as Figure 1 - Figure 2As shown in the figure, an explosion-proof brake of the present utility model includes a brake seat 1. A working box 2 is arranged on the brake seat 1. Static iron core assemblies 3 are fixedly arranged at both ends of the working box 2. A static iron core is arranged in the static iron core assemblies 3. A stop 4 is arranged on the outer periphery of the static iron core assemblies 3. An O-ring seal 5 is arranged between the stop 4 and the working box 2. A partition 9 is arranged in the working box 2. A coil assembly 7 is arranged on each side of the partition 9. A moving iron core assembly 8 is arranged in each of the two coil assemblies 7. The moving iron core assembly 8 and the coil assembly 7 form an axial sliding pair. Springs 10 are respectively arranged between the two moving iron core assemblies 8 and the partition 9. The springs 10 bias the moving iron core assemblies 8 inward. Guide shafts 11 are respectively connected to the outer sides of the two moving iron core assemblies 8. The guide shafts 11 pass outward through the static iron core assemblies 3. An oil-free sliding bearing 12 is arranged between the guide shafts 11 and the static iron core assemblies 3. A wiring box 13 is arranged on the working box 2. The working box 2 and the wiring box 13 are hermetically separated from each other. A wiring row 15 is arranged in the wiring box 13. Wiring terminals are arranged on the wiring row 15. An electrical clearance and a creepage distance are arranged between the wiring terminals. The wiring terminals are connected to cables. A through hole 14 is arranged between the wiring box 13 and the working box 2. A rubber pad with a wire passing hole is arranged in the through hole 14. The cables pass through the wire passing holes and are connected to the coil assemblies 7. A sealing structure 16 is arranged in the through hole 14.

[0021] Further, the working box 2 is made of seamless steel pipe.

[0022] Further, a rubber cover 17 is sleeved on the outer side of the static iron core assembly 3 and on the guide shaft 11.

[0023] Further, the guide shaft 11 is made of S30408 stainless steel material.

[0024] Further, the sealing structure 16 is epoxy resin.

[0025] Further, a cable inlet and outlet is arranged on the side wall of the wiring box 13. A cable introducing device 18 with a sealing ring is arranged in the cable inlet and outlet.

[0026] Further, a box cover 19 is arranged on the wiring box 13. A rubber sealing pad 20 is arranged between the box cover 19 and the wiring box 13.

[0027] Specifically, the working box 2, the static iron core assembly 3, the O-ring seal 5, the coil assembly 7, the moving iron core assembly 8, the oil-free sliding bearing 12, the wiring row 15, the wiring terminals, the seamless steel pipe, the epoxy resin, the cable introducing device 18 with a sealing ring, etc. in this embodiment all adopt well-known solutions in the prior art, which are already understood by those skilled in the art and will not be elaborated here.

[0028] The working principle of this embodiment:

[0029] 1. Scope of Application

[0030] It is applicable to the power mechanism of explosion-proof elevator brakes

[0031] 2. Applicable Environmental Sites

[0032] It is applicable to Zone 1 (and lower grades) of Class II of explosive gas environment, Zone 1 (and lower grades) of Class III of explosive dust environment, or places where both coexist.

[0033] 3. Explosion-proof Marking

[0034] Ex db ebⅡCT4Gb / Ex tbⅢC T130℃Db

[0035] Explosion-proof type: Flameproof increased-safety composite type, dust-ignition-proof enclosure protection tb, equipment protection level is Gb or Db, temperature class is T4 or 130℃. It is applicable to places in explosive gas environment II C (or lower grades) and explosive dust environment III C (or lower grades).

[0036] 4. Mechanism Composition

[0037] The guiding shaft 11 is finely processed from wear-resistant and corrosion-resistant 0Cr18Ni9 (S30408) stainless steel material. The static iron core assembly 3 combines the static iron core and the end cover into one piece. A round hole is finely processed in the center of the static iron core assembly 3, and a carbon steel-based oil-free sliding bearing 12 (φ14×φ12×8) is embedded to facilitate the sliding of the guiding shaft 11 in the oil-free sliding bearing 12. The end of the static iron core assembly 3 is finely processed into a mating surface of the stop 4, and an O-ring seal 5 is used to seal the joints at both ends of the working box 2. The junction box 13 is rectangular, and the bottom of the box is finely processed into an arc shape, which closely fits with the cylindrical shell and is fixed with bolts. There is a through hole 14 in the center of the lower part of the junction box 13, which communicates with the upper part of the working box 2. A rubber pad with a wire-passing hole is embedded. After the wire passing is completed, it is filled with epoxy resin for potting to seal the two cavities. A wiring row 15 and wiring terminals, etc. are installed in the junction box 13.

[0038] 5. Working Process and Innovation Points

[0039] (1) Working Process

[0040] When the brake receives a working signal, the coil assembly 7 is energized to generate a magnetic field, and the static iron core attracts the two moving iron core assemblies 8 on both sides, causing both the two moving iron core assemblies 8 and the guiding shaft 11 to move outward, opening the brake arms and opening the brake. Conversely, after the coil assembly 7 loses power, the spring 10 uses the resilience to close the brake.

[0041] (2) Innovation Points

[0042] 1. The static iron core assemblies 3 at both ends of the cylinder body are sealed with a spigot 4 and an O-ring seal 5. A carbon-based oil-free sliding bearing 12 is provided between the guide shaft 11 and the static iron core. The guide shaft 11 is made of wear-resistant and corrosion-proof stainless steel material, with good sealing effect. When the brake is working or the brake is manually released with a brake release wrench, the system is safer.

[0043] 2. The working box 2 and the junction box 13 are divided into two cavities. A rubber pad with a wire-passing hole is provided in the through hole 14 between the junction box 13 and the working box 2. After wiring is completed, it is filled with epoxy resin for potting to seal the two cavities from each other, greatly improving the safety of the system.

[0044] 3. Sufficient electrical clearance and creepage distance are left between the terminal blocks to make the terminal strip 15 safer.

[0045] 4. The cover of the junction box 13 uses a rubber gasket 20 to seal the junction box 13.

[0046] 5. The cable inlet and outlet use a cable entry device 18 with a sealing ring to improve the sealing performance.

Claims

1. An explosion-proof brake, characterized in that, It includes a brake seat, on which a working box is provided. At both ends of the working box, static iron core assemblies are fixedly arranged. A static iron core is arranged in the static iron core assemblies. A stop is arranged on the outer periphery of the static iron core assemblies. An O-ring seal is arranged between the stop and the working box. A partition is arranged in the working box. On both sides of the partition, a coil assembly is respectively arranged. In each of the two coil assemblies, a moving iron core assembly is arranged. The moving iron core assembly and the coil assembly form an axial sliding pair. Springs are respectively arranged between the two moving iron core assemblies and the partition. The springs bias the moving iron core assemblies inward. On the outer sides of the two moving iron core assemblies, guide shafts are respectively connected. The guide shafts pass outward through the static iron core assemblies. An oil-free sliding bearing is arranged between the guide shafts and the static iron core assemblies. A junction box is arranged on the working box. The working box and the junction box are sealed and separated from each other. A bus bar is arranged in the junction box. Wiring terminals are arranged on the bus bar. Electrical clearances and creepage distances are arranged between the wiring terminals. The wiring terminals are connected with cables. A through hole is arranged between the junction box and the working box. A rubber pad with a wire-passing hole is arranged in the through hole. After the cables pass through the wire-passing holes, they are connected with the coil assemblies. A sealing structure is arranged in the through hole.

2. The explosion-proof brake according to claim 1, characterized in that, The working box is made of seamless steel pipe.

3. An explosion-proof brake according to claim 1, characterized in that, A rubber cover is sleeved on the guide shaft on the outer side of the static iron core assembly.

4. An explosion-proof brake according to claim 1, characterized in that, The guide shaft is made of S30408 stainless steel material.

5. An explosion-proof brake according to claim 1, characterized in that, The sealing structure is epoxy resin.

6. An explosion-proof brake according to claim 1, characterized in that, A cable inlet and outlet is arranged on the side wall of the junction box. A cable inlet device with a seal ring is arranged in the cable inlet and outlet.

7. An explosion-proof brake according to claim 1, characterized in that, A box cover is arranged on the junction box. A rubber gasket is arranged between the box cover and the junction box.

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