Cover opening mechanism and shell structure of explosion-proof operation column

Abstract

The utility model relates to a cover opening mechanism and a shell structure of an explosion-proof operation column. The technical problem that an existing explosion-proof operation column is small in box opening angle is solved. Comprising a hinge piece arranged between one side of a box body and one side of a box cover, the hinge piece is provided with a hinge upper half body and a hinge lower half body which are correspondingly arranged up and down, and the upper end of the hinge upper half body is fixedly connected to the inner side of the box cover through an installation fixing structure; the upper end and the lower end of the fixing piece are sealed with the inner side of the box body respectively, and the lower end of the hinge upper half body extends downwards into the box body and is hinged to the hinge lower half body arranged in the fixing piece in a sliding and penetrating mode. The hinge has the advantages that the hinge can be rotationally connected conveniently through the hinge piece and the fixing piece, the box opening angle between the box cover and the box body can be increased, a user can conduct maintenance operation conveniently, and the maintenance efficiency is improved. The connection stability between the hinge upper half body and the box cover can be improved by installing the fixing structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion-proof operating column equipment, and in particular relates to a cover opening mechanism and a shell structure of an explosion-proof operating column. Background Art

[0002] Explosion-proof operating columns are widely used as electrical control equipment in flammable and explosive hazardous places to control electromagnetic electrical appliances or controlled motors at close range or on-site. However, with the development of science and technology and the advancement of technology, the operating covers of currently used explosion-proof operating columns generally adopt ordinary hinge-type opening structures, among which the ordinary hinge-type opening structures have poor rigidity and reduce service life. In addition, the opening angle of the existing operating cover is small, which makes user maintenance inconvenient and reduces maintenance efficiency.

[0003] In order to solve the deficiencies in the prior art, people have conducted long-term explorations and proposed a variety of solutions. For example, a Chinese patent document discloses an explosion-proof box with a hinged box cover [202020429298 9], which includes a rectangular explosion-proof box including a box cover, a box cavity and a bottom plate, a hinge is installed between the box cover and the bottom plate in the box cavity, and the installation position is limited to deviating from the center in the length direction of the explosion-proof box; the hinge consists of an upper page, a hinge shaft, and a lower page, the upper page is fixed on the box cover, and the lower page includes a transverse limit pin, a vertical pin and its support seat, the support seat is fixed on the bottom plate of the box cavity, and a vertical pin limit hole is set on the support seat, and the length of the vertical pin limit hole is less than the length of the vertical pin; the vertical pin is inserted into the pin limit hole, its upper end is hinged on the hinge shaft, and its lower end is connected to the transverse limit pin.

[0004] The above solution solves the problem of poor rigidity of the existing hinged cover opening structure to a certain extent, but the solution still has many shortcomings. For example, the opening angle of the box cover through the hinge is still small, which is inconvenient for users to maintain and affects maintenance efficiency. Summary of the invention

[0005] The purpose of the utility model is to provide a cover opening mechanism for an explosion-proof operating column in view of the above problems.

[0006] Another object of the present invention is to provide a housing structure in view of the above problem.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a cover opening mechanism of an explosion-proof operating column, comprising a hinge member arranged between one side of a box body and one side of a box cover, the hinge member having an upper hinge half and a lower hinge half which are arranged correspondingly up and down, the upper end of the upper hinge half is fixedly connected to the inner side of the box cover by installing a fixing structure, a hollow fixing member is vertically arranged in the box body, the upper and lower ends of the fixing member are respectively sealed to the inner side of the box body, the lower end of the upper hinge half extends downward into the box body and is hinged to the lower hinge half which is slidably penetrated in the fixing member, the opening and closing angle between the box body and the box cover can be increased by the upper hinge half and the lower hinge half, which is convenient for user maintenance.

[0008] In the above-mentioned opening mechanism of an explosion-proof operating column, the inner side of the upper end of the box body has a box body fold edge bent horizontally inward, the end of the box body fold edge away from the box body has a vertical fold edge bent vertically upward, the vertical fold edge has a horizontal fold edge bent horizontally outward, and the inner side of the box cover has a box cover sealing strip abutting against the horizontal fold edge, and a horizontal sealing surface is formed between the box cover sealing strip and the horizontal fold edge, the outer side of the box cover has a box cover fold edge bent vertically downward, and the box cover fold edge is correspondingly arranged on the outer side of the vertical fold edge. The box cover sealing strip and the horizontal sealing surface can improve the sealing effect between the box cover and the box body, thereby ensuring explosion-proof performance and protection capability.

[0009] In the above-mentioned opening mechanism of an explosion-proof operating column, a through hole is provided on the folded edge of the box body for the upper half of the hinge to pass through, the fixing piece is in the shape of a hollow cylinder, and the inner side of the fixing piece has a sliding channel for the lower half of the hinge to slide into, and a reducing portion with a diameter larger than that of the fixing piece is provided at the upper end of the fixing piece, and an opening corresponding to the through hole is provided at the upper end of the reducing portion, and a hinge cavity is provided in the reducing portion, which is respectively connected to the opening and the sliding channel, and the size of the hinge cavity is sufficient for the upper half of the hinge and the lower half of the hinge to be fixedly connected in the hinge cavity, and can facilitate the sliding setting of the upper half of the hinge and the lower half of the hinge.

[0010] In the above-mentioned opening mechanism of an explosion-proof operating column, the lower end of the upper hinge body passes through the through hole and the opening in sequence and extends into the hinge cavity. The lower end of the upper hinge body is hingedly connected to the upper end of the lower hinge body through a pin shaft in the hinge cavity. An open retaining ring is provided at one end of the pin shaft. The upper hinge body and the lower hinge body can be rotatably connected through the pin shaft, and the pin shaft can be limited by the open retaining ring to prevent the pin shaft from axial movement, thereby ensuring the rotational stability between the upper hinge body and the lower hinge body.

[0011] In the above-mentioned opening mechanism of an explosion-proof operating column, the width of the through hole and the opening are both greater than the width of the upper hinge, the lower hinge and the hinged joint between the upper hinge and the lower hinge, and an annular step is provided between the sliding channel and the hinge cavity, which abuts against the hinged joint between the upper hinge and the lower hinge, and can limit the hinged joint between the upper hinge and the lower hinge, thereby facilitating the rotation of the upper hinge and the lower hinge.

[0012] In the above-mentioned opening mechanism of an explosion-proof operating column, the reducing portion and the fixing piece are connected as an integrated structure, and the upper end of the reducing portion is provided with an upper sealing gasket that abuts against the inner side of the folded edge of the box body, and the lower end of the fixing piece is provided with a pressing ring on the outer side of the fixing sleeve, and a lower sealing gasket is provided between the pressing ring and the bottom of the box body, and the sealing effect between the pressing ring and the bottom of the box body can be improved by the lower sealing gasket.

[0013] In the above-mentioned opening mechanism of an explosion-proof operating column, the installation and fixing structure includes a pad arranged between the box cover and the box cover folded edge, the pad is L-shaped and the upper half of the hinge is curved and extends to one side of the pad, the box cover and the box cover folded edge are respectively provided with mounting bolts connected to the pad and the upper half of the hinge, and the pad can improve the connection stability between the mounting bolts and the box cover and the box cover folded edge.

[0014] In the above-mentioned opening mechanism of an explosion-proof operating column, the box body and the box cover away from the side with the hinge are connected by a fastening assembly, and the fastening assembly includes a plurality of locking bolts penetrated on the box cover, and the locking bolts are threadedly connected to the locking nuts located in the box body, wherein the locking bolts are arranged at the four corners of the box cover, which can ensure the connection stability and sealing effect between the box cover and the box body, improve the explosion-proof performance and protection performance, and the locking bolts at the four corners of the box cover need to be removed when opening the box cover.

[0015] In the above-mentioned opening mechanism of an explosion-proof operating column, a bent mounting cover is installed at the bottom of the box body by means of combination screws, and a bottom pad is provided between the inner side of one end of the mounting cover and the box body, and the other end of the mounting cover extends to the outside of the box body. The mounting cover can be fixedly connected to the pressure ring through the bottom of the box body by means of the combination screws, and the connection stability between the mounting cover and the box body can be improved by means of the bottom pad.

[0016] A shell structure of an opening mechanism of an explosion-proof operating column comprises a box body and a box cover movably arranged at the upper end of the box body, an explosion-proof operating head is arranged on the box cover, and the explosion-proof operating head cooperates with an explosion-proof control button located in the box body, a wiring terminal is arranged on the box body, and an explosion-proof plug or an explosion-proof cable clamping sealing joint is arranged at the lower end of the box body.

[0017] Compared with the existing technology, the advantages of the utility model are:

[0018] 1. The hinge and the fixing parts can facilitate the hinge rotation connection, and can increase the opening angle between the box cover and the box body, which is convenient for users to perform maintenance operations and improves maintenance efficiency.

[0019] 2. The connection stability between the upper hinge body and the box cover can be improved by installing a fixing structure.

[0020] 3. The sealing strip of the box cover and the horizontal sealing surface can improve the sealing effect and the explosion-proof ability.

[0021] 4. The upper sealing gasket, the pressure ring and the lower sealing gasket can improve the connection sealing effect between the fixing part and the box body, and further improve the explosion-proof performance.

[0022] 5. Different types and quantities of explosion-proof operating heads can be selected according to user needs to improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0024] Figure 2 It is a structural sectional view of the first embodiment of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the fastening assembly in the first embodiment of the utility model.

[0026] Figure 4 It is a structural cross-sectional view of the fixing member in the first embodiment of the utility model.

[0027] Figure 5 It is a structural schematic diagram of the second embodiment of the present utility model.

[0028] Figure 6 It is a structural schematic diagram of another explosion-proof operating head in the second embodiment of the present utility model.

[0029] Figure 7 It is a structural schematic diagram of another explosion-proof operating head in the second embodiment of the present utility model.

[0030] Figure 8 It is a structural schematic diagram of another explosion-proof operating head in the second embodiment of the present utility model.

[0031] In the figure: box body 1, box body folding edge 11, through hole 111, vertical folding edge 12, horizontal folding edge 13, box cover sealing strip 14, horizontal sealing surface 15, combination screw 16, explosion-proof control button 17, terminal 18, box cover 2, box cover folding edge 21, hinge part 3, hinge upper half 31, hinge lower half 32, pin 33, opening retaining ring 34, installation and fixing structure 4, pad 41, mounting bolt 42, fixing part 5, sliding channel 51, reducing part 52, opening 53, hinge cavity 54, annular step 55, upper sealing gasket 56, pressure ring 57, lower sealing gasket 58, fastening assembly 6, locking bolt 61, locking nut 62, installation cover 7, bottom pad 71, explosion-proof operating head 8, explosion-proof plug or explosion-proof cable clamping sealing joint 9. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Embodiment 1

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 The box cover 2 is connected to the box body 1 by the hinge 3, and the box body 1 and the box cover 2 are connected by the hinge 3.

[0035] Specifically, the box body 1 has a box body folded edge 11 bent horizontally inward on the inner side of the upper end thereof, and the end of the box body folded edge 11 away from the box body 1 has a vertical folded edge 12 bent vertically upward, the vertical folded edge 12 has a horizontal folded edge 13 bent horizontally outward, and the inner side of the box cover 2 has a box cover sealing strip 14 abutting against the horizontal folded edge 13, and a horizontal sealing surface 15 is formed between the box cover sealing strip 14 and the horizontal folded edge 13, and the box cover 2 has a box cover folded edge 21 bent vertically downward on the outer side thereof, and the box cover folded edge 21 is correspondingly arranged on the outer side of the vertical folded edge 12 in the circumferential direction, and the box cover sealing strip 14 and the horizontal sealing surface 15 can improve the sealing effect between the box cover 2 and the box body 1, thereby ensuring explosion-proof performance and protection capability.

[0036] The box body fold 11 is provided with a through hole 111 for the hinge upper half 31 to pass through, the fixing member 5 is hollow and cylindrical, and the fixing member 5 has a sliding channel 51 on the inner side of the circumference for the hinge lower half 32 to slide into, and the hinge lower half 32 can be slidably arranged in the sliding channel 51, and a reducing portion 52 with a diameter greater than that of the fixing member 5 is provided at the upper end of the fixing member 5, and the reducing portion 52 can facilitate the connection and fixation of the hinge upper half 31 and the hinge lower half 32, and the reducing portion The upper end of 52 has an opening 53 corresponding to the through hole 111, and the opening 53 facilitates the hinge upper body 31 and the hinge lower body 32 to enter and exit the sliding channel 51, and the reducing portion 52 has a hinge cavity 54 connected with the opening 53 and the sliding channel 51 respectively, and the size of the hinge cavity 54 is sufficient for the hinge upper body 31 and the hinge lower body 32 to be fixedly connected in the hinge cavity 54, and can facilitate the sliding setting of the hinge upper body 31 and the hinge lower body 32.

[0037] like Figure 2 , Figure 4 As shown, the lower end of the hinge upper body 31 passes through the through hole 111 and the opening 53 in sequence and extends into the hinge cavity 54. The lower end of the hinge upper body 31 is hingedly connected to the upper end of the hinge lower body 32 through a pin shaft 33 in the hinge cavity 54. An open retaining ring 34 is provided at one end of the pin shaft 33. The hinge upper body 31 and the hinge lower body 32 can be rotatably connected through the pin shaft 33, and the open retaining ring 34 can limit the pin shaft to prevent the pin shaft from axial movement, thereby ensuring the rotational stability between the hinge upper body 31 and the hinge lower body 32.

[0038] Furthermore, the widths of the through hole 111 and the opening 53 are both greater than the widths of the hinge upper body 31, the hinge lower body 32 and the hinged joint between the hinge upper body 31 and the hinge lower body 32, so that the hinged lower body 32 and the hinged upper body 31 can rotate through the through hole 111 and the opening 53, and an annular step 55 is provided between the sliding channel 51 and the hinge cavity 54, which abuts against the hinged joint between the hinge upper body 31 and the hinge lower body 32, and can limit the hinged joint between the hinge upper body 31 and the hinge lower body 32, so that the hinge upper body 31 and the hinge lower body 32 can rotate.

[0039] Among them, the reducing portion 52 and the fixing member 5 are connected as an integrated structure, which can improve the structural strength and the service life, and the upper end of the reducing portion 52 is provided with an upper sealing gasket 56 that abuts against the inner side of the folded edge 11 of the box body. The upper sealing gasket 56 can improve the sealing effect between the reducing portion 52 and the folded edge 11 of the box body, and the lower end of the fixing member 5 is circumferentially provided with a pressing ring 57 on the outer side of the fixing sleeve, and one end of the fixing member 5 is arranged in the pressing ring 57, and a lower sealing gasket 58 is provided between the pressing ring 57 and the bottom of the box body 1, and the lower sealing gasket 58 can improve the sealing effect between the pressing ring 57 and the bottom of the box body 1.

[0040] Combination Figure 1 , Figure 2 , Figure 3 As shown, the mounting and fixing structure 4 includes a pad 41 arranged between the box cover 2 and the box cover folded edge 21, the pad 41 is L-shaped and the hinge upper body 31 is curved and extends to one side of the pad 41, and the box cover 2 and the box cover folded edge 21 are respectively provided with mounting bolts 42 connected to the pad 41 and the hinge upper body 31, and the pad 41 can improve the connection stability between the mounting bolts 42 and the box cover 2 and the box cover folded edge 21.

[0041] Among them, the box body 1 and the box cover 2 are connected between the side away from the hinge part 3 through a fastening assembly 6, and the fastening assembly 6 includes a plurality of locking bolts 61 passing through the box cover 2, and the locking bolts 61 are threadedly connected to the locking nuts 62 located in the box body 1, wherein the locking bolts 61 are arranged at the four corners of the box cover 2, which can ensure the connection stability and sealing effect between the box cover 2 and the box body 1, improve the explosion-proof performance and protection performance, and when opening the box cover 2, the locking bolts 61 at the four corners of the box cover 2 need to be removed.

[0042] Specifically, a bent mounting cover plate 7 is installed at the bottom of the box body 1 by means of a combination screw 16, and a bottom pad 71 is provided between the inner side of one end of the mounting cover plate 7 and the box body 1, and the other end of the mounting cover plate 7 extends to the outside of the box body 1. The mounting cover plate 7 can be fixedly connected to the pressure ring 57 through the bottom of the box body 1 by means of the combination screw 16, and the connection stability between the mounting cover plate 7 and the box body 1 can be improved by means of the bottom pad 71.

[0043] like Figure 1 , Figure 3 As shown, a shell structure of an opening mechanism of an explosion-proof operating column comprises a box body 1 and a box cover 2 movably arranged at the upper end of the box body 1. The box body 1 can be sealed by the box cover 2 to improve the explosion-proof capability. An explosion-proof operating head 8 is arranged on the box cover 2, and the explosion-proof operating head 8 cooperates with an explosion-proof control button 17 located in the box body 1. A wiring terminal 18 is arranged on the box body 1, and an explosion-proof plug or an explosion-proof cable clamping sealing joint 9 is arranged at the lower end of the box body 1. The explosion-proof operating head 8 can effectively prevent the generation of sparks and static electricity during use, thereby improving work efficiency and reliability. The explosion-proof plug or the explosion-proof cable clamping sealing joint 9 can improve safety and prevent the spread of explosion.

[0044] The principle of this embodiment is that when the explosion-proof operating column needs to be maintained, the box cover 2 can be pulled up horizontally by unscrewing the locking bolts 61 at the four corners of the box cover 2, and the box cover 2 can drive the hinge upper half 31 to rise synchronously through the installation fixing structure 4, wherein the hinge upper half 31 and the hinge lower half 32 are rotationally connected through the pin shaft 33, and when the connection between the hinge upper half 31 and the hinge lower half 32 passes through the opening 53, the box cover 2 can be bent and rotated to open the box cover 2, which can increase the opening angle and facilitate the user to perform maintenance operations.

[0045] Embodiment 2

[0046] The structure and working principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the explosion-proof operating heads 8 can be selected in different quantities and shapes according to user requirements, which is convenient for users to choose and improves user experience.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0048] Although this article uses more terms such as box body 1, box body folding edge 11, through hole 111, vertical folding edge 12, horizontal folding edge 13, box cover sealing strip 14, horizontal sealing surface 15, combination screw 16, explosion-proof control button 17, terminal 18, box cover 2, box cover folding edge 21, hinge part 3, hinge upper half 31, hinge lower half 32, pin shaft 33, opening retaining ring 34, installation and fixing structure 4, gasket 41, installation bolt 42, fixing part 5, sliding channel 51, reducing part 52, opening 53, hinge cavity 54, annular step 55, upper sealing gasket 56, pressure ring 57, lower sealing gasket 58, fastening assembly 6, locking bolt 61, locking nut 62, installation cover plate 7, bottom gasket 71, explosion-proof operating head 8, explosion-proof plug or explosion-proof cable clamping sealing joint 9, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitations interpreted as these terms are contrary to the spirit of the present invention.

Claims

1. An explosion-proof operating column cover opening mechanism, comprising a hinge member (3) arranged between one side of a box body (1) and one side of a box cover (2), wherein the hinge member (3) comprises an upper hinge half (31) and a lower hinge half (32) arranged correspondingly above and below, characterized in that: The upper end of the hinge upper body (31) is fixedly connected to the inner side of the box cover (2) by means of a mounting fixing structure (4), and a hollow fixing member (5) is vertically arranged in the box body (1). The upper and lower ends of the fixing member (5) are respectively sealed with the inner side of the box body (1), and the lower end of the hinge upper body (31) extends downward into the box body (1) and is hingedly connected to a hinge lower body (32) slidably arranged in the fixing member (5).

2. The cover opening mechanism of the explosion-proof operating column according to claim 1, characterized in that: The upper end of the box body (1) has a box body folded edge (11) bent horizontally inwardly on the inner side of the circumference, and the end of the box body folded edge (11) away from the box body (1) has a vertical folded edge (12) bent vertically upward, and the vertical folded edge (12) has a horizontal folded edge (13) bent horizontally outward, and the inner side of the box cover (2) has a box cover sealing strip (14) abutting against the horizontal folded edge (13), and a horizontal sealing surface (15) is formed between the box cover sealing strip (14) and the horizontal folded edge (13), and the outer side of the box cover (2) has a box cover folded edge (21) bent vertically downward, and the box cover folded edge (21) is correspondingly arranged on the outer side of the vertical folded edge (12).

3. The cover opening mechanism of the explosion-proof operating column according to claim 2, characterized in that: The box body fold (11) is provided with a through hole (111) for the hinge upper half (31) to pass through, the fixing member (5) is in the shape of a hollow cylinder, and the fixing member (5) has a sliding channel (51) on the inner side in the circumferential direction for the hinge lower half (32) to slide into, and the fixing member (5) has a reducing portion (52) with a diameter larger than that of the fixing member (5) at the upper end, and the reducing portion (52) has an opening (53) corresponding to the through hole (111) at the upper end, and a hinge cavity (54) is provided in the reducing portion (52) which is respectively connected to the opening (53) and the sliding channel (51).

4. The cover opening mechanism of the explosion-proof operating column according to claim 3, characterized in that: The lower end of the hinge upper body (31) passes through the through hole (111) and the opening (53) in sequence and extends into the hinge cavity (54). The lower end of the hinge upper body (31) is hingedly connected to the upper end of the hinge lower body (32) through a pin shaft (33) in the hinge cavity (54). An open retaining ring (34) is provided at one end of the pin shaft (33).

5. The cover opening mechanism of an explosion-proof operating column according to claim 3 or 4, characterized in that: The widths of the through hole (111) and the opening (53) are greater than the widths of the hinge upper body (31), the hinge lower body (32) and the hinge joint between the hinge upper body (31) and the hinge lower body (32), and an annular step (55) is provided between the sliding channel (51) and the hinge cavity (54) to abut against the hinge joint between the hinge upper body (31) and the hinge lower body (32).

6. The cover opening mechanism of the explosion-proof operating column according to claim 3, characterized in that: The reducing portion (52) and the fixing member (5) are connected as an integrated structure, and the upper end of the reducing portion (52) is provided with an upper sealing gasket (56) which abuts against the inner side of the folded edge (11) of the box body, and the lower end of the fixing member (5) is provided with a pressing ring (57) around the outer side of the fixing sleeve, and a lower sealing gasket (58) is provided between the pressing ring (57) and the bottom of the box body (1).

7. The cover opening mechanism of the explosion-proof operating column according to claim 2, characterized in that: The mounting and fixing structure (4) comprises a pad (41) arranged between the box cover (2) and the box cover folded edge (21); the pad (41) is L-shaped and the hinge upper body (31) is curved and extends to one side of the pad (41); and the box cover (2) and the box cover folded edge (21) are respectively provided with mounting bolts (42) connected to the pad (41) and the hinge upper body (31).

8. The cover opening mechanism of an explosion-proof operating column according to claim 2, characterized in that: The box body (1) and the box cover (2) are connected to each other at a side away from the hinge (3) via a fastening assembly (6). The fastening assembly (6) comprises a plurality of locking bolts (61) passing through the box cover (2). The locking bolts (61) are threadedly connected to locking nuts (62) located in the box body (1).

9. The cover opening mechanism of an explosion-proof operating column according to claim 1, characterized in that: A bent mounting cover plate (7) is mounted on the bottom of the box body (1) by means of a combination screw (16), a bottom pad (71) is provided between the inner side of one end of the mounting cover plate (7) and the box body (1), and the other end of the mounting cover plate (7) extends to the outside of the box body (1).

10. A shell structure of a cover opening mechanism using an explosion-proof operating column according to any one of claims 1 to 9, comprising a box body (1) and a box cover (2) movably arranged on the upper end of the box body (1), characterized in that: The box cover (2) is provided with an explosion-proof operating head (8), and the explosion-proof operating head (8) cooperates with an explosion-proof control button (17) located in the box body (1). The box body (1) is provided with a wiring terminal (18), and an explosion-proof plug or an explosion-proof cable clamping sealing joint (9) is provided at the lower end of the box body (1).

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