Explosion-proof electric drum

Abstract

This utility model relates to an explosion-proof electric roller, including a cylinder body. A drive motor and a reduction gearbox are installed inside the cylinder body. A left end cover and a right end cover are respectively installed at both ends of the cylinder body. A left fixed shaft and a right fixed shaft are respectively installed at both ends of the cylinder body. The drive motor outputs power to drive the left end cover to rotate through the reduction gearbox. An explosion-proof component is installed on the left end cover, including an explosion-proof groove and an explosion-proof membrane assembly. An explosion-proof hole is provided at the bottom of the explosion-proof groove, communicating with the inside of the cylinder body. A quick-release structure is provided between the explosion-proof groove and the explosion-proof module. The explosion-proof component added to the left end cover allows the explosion-proof membrane assembly to rupture when the pressure reaches a threshold, quickly releasing the internal pressure and preventing the cylinder body from exploding due to internal pressure overload, effectively ensuring the safety of equipment and on-site personnel. The quick-release structure eliminates the cumbersome operation of disassembling and installing the traditional bolt-fastened explosion-proof membrane, significantly shortening the replacement time of the explosion-proof membrane assembly, reducing equipment downtime, and reducing the workload of maintenance personnel.

Description

Technical Field

[0001] This utility model relates to the field of roller technology, and in particular to an explosion-proof electric roller. Background Technology

[0002] In material conveying scenarios such as mines, coal mines, and building materials, electric rollers, due to their compact structure integrating motors and reducers, have become the core driving component of belt conveyors, and their operational stability directly affects production efficiency.

[0003] However, such scenarios generally involve high levels of dust pollution, with dust easily entering the interior through the sealing gaps of the electric drum shaft head and the motor junction box interface. Existing technologies generally employ multiple lip seals and sealant potting to construct a reinforced sealing structure to block dust. However, the sealing design creates a near-sealed space within the drum, preventing the heat generated by the motor and the frictional heat from the reducer transmission from effectively dissipating through air convection. This leads to a continuous rise in internal temperature and a surge in air pressure. When the pressure exceeds the pressure limit, an explosion will be triggered, causing equipment damage and threatening personnel safety.

[0004] To mitigate the risk of explosion, some explosion-proof electric rollers are equipped with explosion-proof membranes. However, existing explosion-proof membranes are typically secured to the roller shell with bolts. When the internal pressure reaches a threshold causing the explosion-proof membrane to rupture, repairs require disassembling all fastening bolts, removing the damaged membrane, reinstalling a new membrane, and tightening the bolts one by one. This cumbersome process leads to lengthy repair times, further extending conveyor belt downtime, exacerbating production losses, and increasing the workload of on-site maintenance personnel. Summary of the Invention

[0005] To solve the above problems, this utility model provides an explosion-proof electric roller.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An explosion-proof electric roller includes a cylinder body, inside which a drive motor and a reduction gearbox are disposed. A left end cover and a right end cover are respectively disposed at both ends of the cylinder body. A left fixed shaft and a right fixed shaft are respectively disposed at both ends of the cylinder body. The left fixed shaft passes through the left end cover and is fixed to the reduction gearbox, and the right fixed shaft passes through the right end cover and is fixed to the drive motor. A left bearing is disposed between the left fixed shaft and the left end cover, and a right bearing is disposed between the right fixed shaft and the right end cover. The drive motor outputs power to drive the left end cover to rotate through the reduction gearbox. An explosion-proof component is disposed on the left end cover. The explosion-proof component includes an explosion-proof groove disposed on the left end cover and an explosion-proof membrane assembly disposed within the explosion-proof groove. An explosion-proof hole is disposed at the bottom of the explosion-proof groove, and the explosion-proof hole communicates with the inside of the cylinder body. A quick-release structure is provided between the explosion-proof groove and the explosion-proof module.

[0008] More specifically, the quick-release structure includes a sliding groove annularly disposed on the side wall of the explosion-proof groove and a first one-way tooth on the side wall of the sliding groove away from the explosion-proof hole. At least two axial grooves are disposed on the side wall of the explosion-proof groove along the axial direction, and the axial grooves are connected to the sliding groove. Two protruding ends are formed by extending outward from the edge of the explosion-proof membrane assembly, and the two protruding ends correspond to the axial grooves. A second one-way tooth is disposed on each of the protruding ends, and the first one-way tooth and the second one-way tooth cooperate with each other.

[0009] More specifically, the number of axial grooves and protruding ends are the same, both being four, and they are evenly distributed.

[0010] More specifically, the explosion-proof membrane assembly includes a first ring sheet and a second ring sheet, with the explosion-proof membrane sandwiched between the first ring sheet and the second ring sheet; the output end is disposed on the first ring sheet or the second ring sheet.

[0011] More specifically, a sealing ring is provided on the side of the explosion-proof membrane assembly near the explosion-proof hole. The sealing ring is disposed on the ring plate, and the diameter of the sealing ring is larger than the diameter of the explosion-proof hole.

[0012] More specifically, the first unidirectional tooth and the second unidirectional tooth have the same tooth profile structure, both including an inclined guide surface and a limiting surface perpendicular to the groove wall.

[0013] More specifically, an annular cover plate is provided on the explosion-proof groove, and a sliding groove is formed between the annular cover plate and the explosion-proof groove, and the first one-way tooth is provided on the annular cover plate.

[0014] More specifically, a vent is provided inside the right fixed shaft. One end of the vent opens to connect to the internal cavity of the cylinder, and the other end of the vent opens to provide a filter and connect to the external environment of the cylinder.

[0015] More specifically, a fixing groove is provided on the explosion-proof groove, and the annular cover plate is disposed in the fixing groove, with the top surface of the annular cover plate flush with the left end cover.

[0016] More specifically, the outer surface of the cylinder is provided with anti-slip texture.

[0017] The beneficial effects of this utility model are as follows: the explosion-proof component added to the left end cover forms a key protection, and the explosion-proof membrane can rupture when the pressure reaches the threshold, quickly releasing the internal pressure through the explosion-proof hole, avoiding the explosion caused by internal pressure overload of the cylinder, and effectively ensuring the safety of the equipment and on-site personnel; the quick-release structure between the explosion-proof groove and the explosion-proof membrane eliminates the cumbersome operation of disassembling and installing the traditional bolt-fastened explosion-proof membrane, greatly shortening the replacement time of the explosion-proof membrane, reducing equipment downtime, and reducing the workload of maintenance personnel. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural schematic diagram of the explosion-proof electric roller of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged structural diagram of part A in the middle;

[0020] Figure 3 This is a schematic diagram of the structure of the annular cover plate of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the explosion-proof membrane assembly of this utility model.

[0022] In the diagram: 10. Cylinder body; 20. Drive motor; 30. Reduction gearbox; 40. Left end cover; 41. Left bearing; 50. Right end cover; 51. Right bearing; 60. Left fixed shaft; 70. Right fixed shaft; 71. Vent hole; 72. Filter element; 80. Explosion-proof component; 81. Explosion-proof groove; 82. Explosion-proof hole; 83. Sliding groove; 84. First one-way tooth; 85. Axial groove; 86. Protruding end; 87. Second one-way tooth; 88. First ring plate; 89. Second ring plate; 810. Explosion-proof membrane; 811. Sealing ring; 812. Annular cover plate. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation on this utility model. The direction of movement is also a relative direction of movement and is not limited to an absolute direction of movement. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 The electric roller shown is an integrated transmission device, with the cylinder 10 as the basic load-bearing frame. The cylinder 10 is made of high-strength steel and forms a sealed installation cavity inside, providing protection and installation space. Inside the internal cavity of the cylinder 10, a drive motor 20 and a reduction gearbox 30 are arranged sequentially along the axial direction of the cylinder 10, and the two are coaxially assembled through a flange structure. At the two ends of the cylinder 10, a left end cover 40 and a right end cover 50 are respectively sealed and assembled, which not only ensures the airtightness of the cylinder 10 to meet explosion-proof requirements, but also facilitates later disassembly and maintenance.

[0027] Corresponding to the end cap structures at both ends of the cylinder 10, a left fixed shaft 60 and a right fixed shaft 70 are respectively provided on the extended axis of the cylinder 10, serving as a fixed support for the overall equipment. One end of the left fixed shaft 60 passes through the central hole of the left end cap 40 axially and is fixed to the housing of the reduction gearbox 30 by a key connection or interference fit, thus fixing the reduction gearbox 30. One end of the right fixed shaft 70 passes through the central hole of the right end cap 50 and is also fixed to the base of the drive motor 20 by a rigid connection structure, thereby enabling the drive motor 20 and the reduction gearbox 30 to form a stable axial support through the two fixed shafts. To achieve relative rotation between the end caps and the fixed shafts, a left bearing 41 is installed between the left fixed shaft 60 and the left end cap 40, and a right bearing 51 is installed between the right fixed shaft 70 and the right end cap 50.

[0028] Based on the structure of the electric roller described above, such as Figure 1 This application provides an explosion-proof electric roller, on which an explosion-proof component 80 is provided. In this application, the explosion-proof component 80 is provided on the left end cover 40. According to the actual needs such as the internal volume of the cylinder 10 and the potential pressure peak, multiple explosion-proof components 80 can also be provided on the end cover (left end cover 40, right end cover 50 or both) to achieve multi-directional and multi-threshold explosion protection and further reduce the risk of explosion.

[0029] like Figures 2-4The explosion-proof assembly 80 shown includes an explosion-proof groove 81 disposed on the left end cover 40 and an explosion-proof membrane 810 assembly disposed within the explosion-proof groove 81. An explosion-proof hole 82 is provided at the bottom of the explosion-proof groove 81, and the explosion-proof hole 82 communicates with the inside of the cylinder 10. When the pressure inside the cylinder 10 exceeds the safety threshold due to increased temperature, high-pressure gas can quickly rush into the explosion-proof groove 81 through the explosion-proof hole 82, thereby pushing the explosion-proof membrane 810 assembly to rupture, allowing the high-pressure gas to be discharged to the outside of the cylinder 10 in a timely manner, avoiding an explosion accident caused by excessive internal pressure in the cylinder 10. The explosion-proof groove 81 and the explosion-proof module are designed with a quick-release structure. This quick-release structure does not require the use of tools to remove the bolts, which greatly shortens the replacement time of the explosion-proof membrane 810 assembly, reduces the intensity of maintenance work, and effectively reduces equipment downtime.

[0030] The quick-release structure includes a sliding groove 83 annularly disposed on the side wall of the explosion-proof groove 81 and a first one-way tooth 84 on the side wall of the sliding groove 83 away from the explosion-proof hole 82. The sliding groove 83 is a recessed groove, and the width and depth of the groove need to be adapted to the thickness of the explosion-proof membrane 810 group to ensure smooth sliding within the groove. The first one-way tooth 84 is evenly distributed along the circumference of the sliding groove 83, and the tooth shape is designed to be inclined along the circumference. One side of the tooth surface is an inclined guide surface, and the other side is a limiting surface perpendicular to the groove wall. This one-way tooth shape can realize the function of allowing the component to move in one direction and forming a limiting function when moving in the opposite direction.

[0031] At least two axial grooves 85 are provided along the axial direction on the side wall of the explosion-proof groove 81, and the axial grooves 85 communicate with the sliding groove 83; two protruding ends 86 are formed by extending outward from the edge of the explosion-proof membrane 810 group, and the two protruding ends 86 correspond to the axial grooves 85; each protruding end 86 is provided with a second one-way tooth 87, and the first one-way tooth 84 and the second one-way tooth 87 cooperate with each other. The first one-way tooth 84 and the second one-way tooth 87 have the same structure and can be arranged facing each other.

[0032] During assembly, the two protruding ends 86 of the explosion-proof membrane 810 assembly are first aligned with the two axial grooves 85 of the explosion-proof groove 81, and the explosion-proof membrane 810 assembly is pushed into the explosion-proof groove 81 along the axial grooves 85 until the protruding ends 86 are completely inserted into the annular sliding groove 83. Then, the explosion-proof membrane 810 assembly is rotated clockwise (or counterclockwise, according to the preset direction of the teeth), which drives the protruding ends 86 to move in the circumferential direction within the sliding groove 83. At this time, the inclined guide surface of the first one-way tooth 84 and the inclined guide surface of the second one-way tooth 87 slide against each other, generating thrust and a small deformation. When the guide surface passes the highest point, the deformation is reset. At this time, the vertical limiting surface of the first one-way tooth 84 and the vertical limiting surface of the second one-way tooth 87 abut against each other, forming a reverse limiting. At this time, the explosion-proof membrane 810 assembly cannot rotate in the reverse direction, thus achieving stable assembly.

[0033] When it is necessary to disassemble and replace the explosion-proof membrane 810 set, simply apply a certain external force and continue to rotate the one-way tooth in the same direction until the protruding end 86 is aligned with the axial groove 85. At this point, the explosion-proof membrane 810 set can be removed. The entire process does not require the use of bolt disassembly tools, making the operation efficient and convenient, and greatly shortening the maintenance time.

[0034] To further enhance the stability of the explosion-proof membrane 810 assembly and the explosion-proof groove 81 after assembly, and to ensure uniform distribution of installation force to avoid sealing failure or loosening caused by uneven local force, the number of axial grooves 85 on the side wall of the explosion-proof groove 81 is adjusted to four, and the four axial grooves 85 are evenly distributed at equal angles along the circumference of the explosion-proof groove 81. The number of protruding ends 86 extending radially outward from the edge of the explosion-proof membrane 810 assembly is also simultaneously set to four, with each of the four protruding ends 86 corresponding one-to-one with the four axial grooves 85, also evenly distributed at equal angles along the circumference of the explosion-proof membrane 810 assembly. The four protruding ends 86 are simultaneously embedded along the four axial grooves 85. The first one-way tooth 84 and the second one-way tooth 87 form a limiting fit at four symmetrical points in the circumferential direction, evenly distributing the installation fixing force to the entire edge of the explosion-proof membrane 810 assembly. This prevents sealing gaps due to local loosening of the explosion-proof membrane 810 assembly, effectively ensuring the airtightness of the cylinder 10 and further improving the safety and reliability of equipment operation.

[0035] like Figure 4 The explosion-proof membrane 810 assembly shown includes a first annular piece 88 and a second annular piece 89, with the explosion-proof membrane 810 sandwiched between the first annular piece 88 and the second annular piece 89; the protruding end 86 is disposed on the first annular piece 88 or the second annular piece 89. The explosion-proof membrane 810 is a functional film with precise tensile strength, and the material can be selected according to the pressure threshold and medium characteristics inside the cylinder 10, such as aluminum alloy film, composite resin film, or metal resin composite film. The explosion-proof membrane 810 is fixed to the first annular piece 88 and the second annular piece 89 by bonding, pressing, or laser welding to prevent the explosion-proof membrane 810 from shifting or falling off in a non-pressure-relieved state.

[0036] like Figure 2 To further enhance the sealing performance between the explosion-proof membrane 810 group and the explosion-proof groove 81, and to prevent dust and moisture from entering the interior of the cylinder 10 through the gap between the explosion-proof membrane 810 group and the explosion-proof groove 81, while ensuring stable sealing during quick-release assembly, this application provides a sealing ring 811 on the side of the explosion-proof membrane 810 group near the explosion-proof hole 82. The sealing ring 811 is made of a material with good elasticity and aging resistance, preferably nitrile rubber, fluororubber, or other elastic materials. The diameter of the sealing ring 811 is larger than the diameter of the explosion-proof hole 82, so it will not affect the use of the explosion-proof hole 82.

[0037] The elastic properties of the sealing ring 811 and the cooperation of the one-way toothed guide surface form a dynamic sealing process of "deformation-reset": when the protruding end 86 of the explosion-proof membrane 810 group is pushed into the explosion-proof groove 81 along the axial groove 85 and rotated to realize the cooperation of the first one-way tooth 84 and the second one-way tooth 87, the guide surface of the first one-way tooth 84 and the guide surface of the second one-way tooth 87 will come into contact with each other and generate a force in the axial direction. During this process, the explosion-proof membrane 810 group will be slightly squeezed towards the explosion-proof hole 82, so that the sealing ring 811 comes into contact with the bottom of the explosion-proof groove 81 and undergoes elastic deformation. As the explosion-proof membrane 810 group continues to rotate until the guide surfaces of the first one-way tooth 84 and the second one-way tooth 87 pass the highest point of their contact, the axial compressive force on the explosion-proof membrane 810 group is gradually released. At this time, the elastic sealing ring 811 will deform and reset under its own elastic restoring force. After reset, the sealing ring 811 still maintains a tight fit with the bottom of the explosion-proof groove 81. Furthermore, the reverse force generated by the elastic reset further enhances the tightness of the fit between the sealing ring 811 and the bottom of the explosion-proof groove 81 and the ring plate, forming a stable and reliable sealing structure. This effectively prevents external dust and moisture from entering the cylinder 10 through the gap between the explosion-proof hole 82 and the explosion-proof membrane 810 group, while not affecting the rupture and pressure relief function of the explosion-proof membrane 810 group under the pressure threshold.

[0038] like Figure 3 An annular cover plate 812 is provided on the explosion-proof groove 81, and a sliding groove 83 is formed between the annular cover plate 812 and the explosion-proof groove 81. The first one-way tooth 84 is provided on the annular cover plate 812. A fixing groove is provided on the explosion-proof groove 81, and the annular cover plate 812 is disposed in the fixing groove. The top surface of the annular cover plate 812 is flush with the left end cover 40. This facilitates processing and maintenance.

[0039] The outer surface of the cylinder 10 is provided with anti-slip texture. The anti-slip texture is formed on the outer surface of the cylinder 10 by rolling, milling or laser engraving process to ensure that the texture is firmly bonded to the metal substrate of the cylinder 10 and is not easy to wear off due to long-term friction.

[0040] like Figure 1 As shown, a vent 71 is provided inside the fixed shaft 70. One end of the vent 71 is open and connected to the internal cavity of the cylinder 10, and the other end of the vent 71 is open and connected to the external environment of the cylinder 10 with a filter element 72. When the electric drum runs and the internal temperature of the cylinder 10 rises, the internal air expands due to heat, and the excess gas can be discharged to the external environment through the vent 71 and the filter element 72, avoiding a sharp increase in internal pressure. When the equipment stops and cools down, the internal air pressure of the cylinder 10 decreases, and the external air enters the cylinder 10 through the vent 71 after being filtered by the filter element 72, replenishing the internal air pressure and keeping the internal air pressure of the cylinder 10 in balance with the external air pressure.

[0041] The explosion-proof component 80 of this application's end cap utilizes a pre-set strength explosion-proof membrane 810 to achieve rapid pressure relief during overload. Combined with the vent 71 containing a filter 72 within the fixed shaft, it actively balances air pressure, effectively preventing the risk of internal pressure explosion. Regarding dust compatibility, the enhanced sealing structure and the sealing ring 811 of the explosion-proof component 80 form multiple dust barriers. The filter 72 prevents dust intrusion during air pressure exchange, and the anti-slip groove design reduces dust accumulation, ensuring long-term stable operation in high-dust environments. In terms of maintenance efficiency, the four evenly distributed protruding ends 86 of the explosion-proof component 80 and the one-way toothed quick-release structure allow for tool-free quick installation and removal of the explosion-proof membrane 810. The removable filter 72 further simplifies maintenance and significantly reduces downtime.

[0042] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An explosion-proof electric roller, comprising a cylinder (10), wherein a drive motor (20) and a reduction gearbox (30) are disposed inside the cylinder (10), a left end cover (40) and a right end cover (50) are respectively disposed at both ends of the cylinder (10), a left fixed shaft (60) and a right fixed shaft (70) are respectively disposed at both ends of the cylinder (10), the left fixed shaft (60) passes through the left end cover (40) and is fixed to the reduction gearbox (30), the right fixed shaft (70) passes through the right end cover (50) and is fixed to the drive motor (20), a left bearing (41) is disposed between the left fixed shaft (60) and the left end cover (40), and a right bearing (51) is disposed between the right fixed shaft (70) and the right end cover (50), wherein the drive motor (20) outputs power to drive the left end cover (40) to rotate through the reduction gearbox (30), characterized in that, An explosion-proof component (80) is provided on the left end cover (40). The explosion-proof component (80) includes an explosion-proof groove (81) provided on the left end cover (40) and an explosion-proof membrane (810) group provided in the explosion-proof groove (81). An explosion-proof hole (82) is provided at the bottom of the explosion-proof groove (81). The explosion-proof hole (82) communicates with the inside of the cylinder (10). The explosion-proof groove (81) and the explosion-proof module are configured with a quick-release structure.

2. The explosion-proof electric roller according to claim 1, characterized in that, The quick-release structure includes a sliding groove (83) annularly disposed on the side wall of the explosion-proof groove (81) and a first one-way tooth (84) on the side wall of the sliding groove (83) away from the explosion-proof hole (82). At least two axial grooves (85) are disposed on the side wall of the explosion-proof groove (81) in the axial direction, and the axial grooves (85) communicate with the sliding groove (83). Two protruding ends (86) are formed by extending outward from the edge of the explosion-proof membrane (810) group, and the two protruding ends (86) correspond to the axial grooves (85). A second one-way tooth (87) is disposed on each of the protruding ends (86), and the first one-way tooth (84) and the second one-way tooth (87) cooperate with each other.

3. The explosion-proof electric roller according to claim 2, characterized in that, The axial grooves (85) and the protruding ends (86) are both four in number and are evenly distributed.

4. The explosion-proof electric roller according to claim 2, characterized in that, The explosion-proof film (810) assembly includes a first ring sheet (88) and a second ring sheet (89), with the explosion-proof film (810) sandwiched between the first ring sheet (88) and the second ring sheet (89); the protruding end is disposed on the first ring sheet (88) or the second ring sheet (89).

5. The explosion-proof electric roller according to claim 4, characterized in that, A sealing ring (811) is provided on the side of the explosion-proof membrane (810) group near the explosion-proof hole (82). The sealing ring (811) is provided on the ring plate, and the diameter of the sealing ring (811) is larger than the diameter of the explosion-proof hole (82).

6. The explosion-proof electric roller according to claim 2, characterized in that, The first one-way tooth (84) and the second one-way tooth (87) have the same tooth structure, both including an inclined guide surface and a limiting surface perpendicular to the groove wall.

7. The explosion-proof electric roller according to claim 2, characterized in that, An annular cover plate (812) is provided on the explosion-proof groove (81), and a sliding groove (83) is formed between the annular cover plate (812) and the explosion-proof groove (81). The first one-way tooth (84) is provided on the annular cover plate (812).

8. The explosion-proof electric roller according to claim 1, characterized in that, A vent hole (71) is provided inside the right fixed shaft (70). One end of the vent hole (71) is open and connected to the internal cavity of the cylinder (10). The other end of the vent hole (71) is open and provided with a filter element (72) and connected to the external environment of the cylinder (10).

9. The explosion-proof electric roller according to claim 7, characterized in that, A fixing groove is provided on the explosion-proof groove (81), and the annular cover plate (812) is provided in the fixing groove. The top surface of the annular cover plate (812) is flush with the left end cover (40).

10. The explosion-proof electric roller according to claim 1, characterized in that, The outer surface of the cylinder (10) is provided with anti-slip texture.

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