Plastic explosion-proof box and assembly method

Abstract

The present invention relates to the field of safety protection of electrical equipment, and specifically to a plastic explosion-proof box including a box body made of plastic material, a box cover, and several connecting components connecting the box body and the box cover; the connecting component includes a slide seat installed on the box body, and a connecting shaft fixedly connected to the box cover. A mounting groove is arranged on the top of the box body, and the slide seat is vertically inserted into the mounting groove and slidingly cooperates with the mounting groove; the slide seat includes a side wall and a bottom plate, and the top of the bottom plate is provided with a through hole; the bottom of the mounting groove is screwed and fixed with a first bolt extending upward, and the first bolt passes through the through hole of the bottom plate and extends into the slide seat; the slide seat can be inserted into the bottom of the mounting groove when it descends, and the slide seat ascends to the upper surface of the bottom plate of the slide seat and abuts against the bolt head of the first bolt. The connecting shaft is radially rotatably installed on the slide seat, and a first avoidance opening is arranged on the top of the side wall of the slide seat. Through the above technical scheme, a box structure and a connecting component structure that are made of plastic and do not damage the appearance of the explosion-proof box are proposed.

Description

Technical Field

[0001] The invention relates to the field of safety protection of electrical equipment, and in particular to a plastic explosion-proof box and an assembly method thereof. Background Art

[0002] Explosion-proof boxes are commonly used electrical safety protection equipment in industry. They are often used in factories with a lot of dust and flying catkins, such as textile and garment processing plants, or chemical plants containing flammable and explosive gases, such as petrochemical processing plants.

[0003] If the explosion-proof box is used in corrosive environments such as seawater and industrial wastewater, the common aluminum or cast iron explosion-proof box is easily corroded. When the corrosion is light, the seal of the lead-out interface of the explosion-proof box will deteriorate and fail, and the control knob or button will be blocked and affect the rebound. Severe corrosion will cause the control knob or button to fail to operate, and even damage the box structure, and the explosion-proof level will be reduced, causing accidents.

[0004] When using explosion-proof boxes in corrosive environments, the existing technology generally starts with the box material, using corrosion-resistant stainless steel or weathering steel to manufacture the explosion-proof box body. However, stainless steel itself is relatively expensive, heavy and difficult to process. For example, stainless steel needs to be machined, which is costly and has high requirements for factory equipment.

[0005] For use in corrosive environments and where the explosion-proof level requirements are not high, the use of plastic materials to make explosion-proof boxes is a way to balance function and cost. On the one hand, plastic materials themselves have strong corrosion resistance, even stronger than stainless steel materials. On the other hand, plastic materials can be directly produced into explosion-proof boxes through injection molding, which has fast production speed and low cost.

[0006] In the prior art, other auxiliary structures of explosion-proof boxes are still designed for metal materials, such as the connection components of the box body and the box cover. Due to the particularity of the explosion-proof box, its box body and the box cover are equipped with mutually matching sealing bosses and sealing grooves (to improve the sealing). Therefore, when opening the box cover, it is necessary to first move the box cover upward before opening it. Therefore, in the existing design, this connection component is also a metal component designed for the special opening method of the explosion-proof box cover, and the connection component can be regarded as a customized special hinge.

[0007] Therefore, the production line (injection molding line) for producing plastic explosion-proof boxes cannot produce this type of connection components. If the metal connection components are directly changed to plastic materials, their strength will not meet the requirements. It is necessary to find an additional metal parts factory to customize the required corrosion-resistant connection components, which is not conducive to arranging production rhythm and is more costly. Summary of the invention

[0008] The purpose of the present invention is to improve the connection structure of the explosion-proof box so that it is suitable for the processing and production of the explosion-proof box made of plastic.

[0009] In order to achieve the above-mentioned purpose, the present invention provides an explosion-proof box, including a box body and a box cover made of plastic material, the box body and the box cover are respectively provided with a sealing boss structure and a sealing groove structure, the explosion-proof box also includes a plurality of connecting components connecting the box body and the box cover, the material of the connecting components is plastic; the connecting components include a slide seat installed on the box body, and a connecting shaft fixedly connected to the box cover.

[0010] A downwardly extending mounting groove is provided on the top of the box body, and the slide is vertically inserted into the mounting groove and slidably cooperates with the mounting groove; the slide includes side walls and a bottom plate, and the bottom plate has a through hole; a first bolt extending upward is screwed and fixed to the bottom of the mounting groove, and the first bolt passes through the through hole of the bottom plate and extends into the slide; the slide can be inserted into the bottom of the mounting groove when it descends, and the slide goes up to the upper surface of the bottom plate and abuts against the bolt head of the first bolt.

[0011] The connecting shaft is radially rotatably mounted on the sliding seat, and a first avoidance opening is arranged on the top of the side wall of the sliding seat.

[0012] Preferably, the bottom of the connecting shaft is inserted into the slide seat and can slide up and down relative to the slide seat; a slide groove extending up and down is arranged on the side wall of the slide seat, and the connecting shaft is provided with a rotating shaft, which is rotatably installed in the slide groove, and the rotating shaft can slide up and down along the slide groove.

[0013] Preferably, the left and right sides of the bottom of the connecting shaft have outwardly protruding truncated cones as rotating shafts, and the left and right side walls of the sliding seat are provided with sliding grooves for installing the rotating shafts.

[0014] Preferably, a avoidance hole extending upward from the bottom is provided in the connecting shaft, a second bolt is provided in the avoidance hole, the second bolt passes through the top of the connecting shaft and is screwed to the box cover, and the second bolt fixes the connecting shaft to the box cover.

[0015] Preferably, when the connecting shaft moves downward, the top of the first bolt including the bolt head is inserted into the avoidance hole of the connecting shaft.

[0016] Preferably, the connecting shaft rotates radially backward around itself, and a second avoidance opening is provided on the side wall at the front of the sliding seat. After the connecting shaft rotates backward, the avoidance hole on the connecting shaft is aligned with the second avoidance opening.

[0017] Preferably, the box cover is provided with a notch, and the top of the connecting shaft is embedded in the notch on the box cover; the notch is provided with a threaded hole, and the second bolt is threadedly installed in the threaded hole on the box cover, and the bolt head at the bottom of the second bolt presses the connecting shaft.

[0018] Preferably, the plurality of connection components are installed at intervals along a straight line on the same side of the box body, and the rotating shafts of the plurality of connection components are on the same axis.

[0019] At the same time, a method for assembling the explosion-proof box is proposed for the explosion-proof box proposed in the foregoing text of the present invention, comprising the following steps:

[0020] a. Insert the slide into the installation slot of the box body, with the first avoidance opening of the slide facing the same direction as the opening direction of the box cover; then pass the tail of the first bolt through the through hole on the bottom plate and screw it to the bottom of the installation slot;

[0021] b. Rotate and install the connecting shaft onto the slide seat;

[0022] c. Rotate the connecting shaft so that the avoidance hole of the connecting shaft is aligned with the second avoidance opening of the slide seat, and at the same time make the top of the connecting shaft fit the installation position of the connecting shaft on the box cover, and then insert the second bolt from the second avoidance opening into the avoidance hole, and the tail of the second bolt passes through the top of the connecting shaft and is screwed to the box cover and tightened.

[0023] The explosion-proof box using the above technical solution of the present invention has the following effects:

[0024] The connection components that connect the box body and the box cover on the explosion-proof box are generally designed for metal materials. If the connection components are directly changed to plastic materials, first of all, the processing technology is different, and even if they are processed and formed, their strength will not meet the standards. On the other hand, the connection components are generally hung on the outside of the box body, which will destroy the square appearance of the explosion-proof box and also have certain requirements for the layout space of the explosion-proof box.

[0025] The present invention redesigns a connection component adapted to a plastic explosion-proof box, which can be made of plastic. The specific connection piece includes two independent parts, one is a slide seat connected to the box body, and the other is a connecting shaft connected to the box cover. The slide seat and the connecting shaft are manufactured by injection molding, and the manufacturing process is similar to that of the explosion-proof box body, and can be produced in the same production line, except that the molds used are different.

[0026] When the box body and the box cover are buckled, the entire connection assembly is buried in the box wall of the box body, and there is no protruding structure on the outer surface of the box body. The square and regular appearance of the explosion-proof box is maintained, which is convenient for the combination and arrangement of the explosion-proof box.

[0027] The present invention provides a mounting groove at the top of the side wall of the box body, and the slide seat is slid from top to bottom into the mounting groove, and the side wall of the slide seat is in clearance with the mounting groove. The slide seat can slide up and down in the mounting groove. In order to prevent the slide seat from sliding out of the mounting groove directly after installation, a first bolt is provided to prevent the slide seat from sliding out. Specifically, the middle of the slide seat is provided with a receiving hole, and the receiving hole is formed by the side wall of the slide seat; the first bolt is provided in the receiving hole; a blocking structure is provided at the bottom of the slide seat, and the blocking structure is the bottom plate itself. In order for the first bolt to pass through the bottom plate and connect with the screw hole at the bottom of the mounting groove, a through hole is provided on the bottom plate. The bottom of the first bolt is screwed and fixed to the screw hole at the bottom of the mounting groove. When the slide seat slides upward, its bottom plate will support the bolt head of the first bolt, thereby preventing the slide seat from leaving the mounting groove.

[0028] The connecting shaft and the slide seat are rotatably connected, and the rotation axis of the connecting shaft is perpendicular to the extension direction of the slide seat, that is, the rotation axis of the connecting shaft is horizontal and parallel to the box wall where the installation groove is located.

[0029] And when the slide moves upward, the rotating shaft of the connecting shaft needs to extend above the installation slot to avoid the connecting shaft from colliding with the side wall of the installation slot. At the same time, a first avoidance opening is provided on the slide to avoid the connecting shaft from colliding with the slide when rotating. The first avoidance opening is located in the rotation direction of the connecting shaft when the box cover is opened. When the slide moves downward, the entire slide is located in the installation slot.

[0030] The receiving hole surrounded by the side wall on the slide also has the function of installing the connecting shaft. The bottom of the connecting shaft is inserted into the middle of the side wall of the slide, and then the connecting shaft and the slide are connected by a rotating shaft to realize the rotational installation of the connecting shaft on the slide.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the explosion-proof box of the present invention after the cover is buckled;

[0033] Figure 2 It is a top view of the explosion-proof box proposed by the present invention after the box cover is buckled;

[0034] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0035] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0036] Figure 5 yes Figure 4 Schematic diagram of the state after the box cover moves upward;

[0037] Figure 6It is a three-dimensional picture with the lid of the box opened;

[0038] Figure 7 yes Figure 6 The enlarged view of point B in the middle;

[0039] Figure 8 It is a three-dimensional diagram of the connecting component slide + connecting shaft;

[0040] Fig. 9 yes Figure 8 Schematic diagram of the dorsal side;

[0041] Fig.10 is a stereoscopic view of the connecting shaft of the connecting assembly after rotation;

[0042] Fig.11 yes Fig.10 Structural cross-section view.

[0043] Description of Reference Numerals

[0044] 1-box, 1a-installation groove, 1b-sealing boss;

[0045] 2-box cover, 2a-sealing groove;

[0046] 3-sliding seat, 3a-side wall, 3a1-first avoidance opening, 3a2-second avoidance opening, 3a3-sliding groove, 3b-bottom plate; 3c-accommodating hole;

[0047] 4-connecting shaft, 4a-avoidance hole, 4b-rotating shaft;

[0048] 5- first bolt;

[0049] 6- Second bolt. DETAILED DESCRIPTION

[0050] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0051] In the present invention, unless otherwise specified, the directional words such as "upper" and "lower" are used. Figure 3 The positional relationship between the middle box body 1 and the box cover 2. "Inside and outside" refer to the inside and outside relative to the outline of each component. "Front and back" means that after the box cover 2 is opened, the side away from the box cover 2 is the "front" and the side close to the box cover 2 is the "back", that is, Figure 6 The left side is "front" and the right side is "back"

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] The present invention provides an explosion-proof box, comprising a box body 1 and a box cover 2 made of plastic. The box body 1 and the box cover 2 are generally made of flame-retardant plastics that are not easy to burn, or engineering plastics, taking into account both structural strength and high temperature resistance and non-combustible properties. The box body 1 made of plastic has a lower structural strength than the metal box body 1 and can only be used in places with low explosion-proof levels. However, the plastic box body 1 also has the advantages of being cheap, easy to process, and having excellent natural corrosion resistance.

[0054] Since the explosion-proof box requires a certain degree of sealing, such as Figure 6 As shown, the joint surface of the box body 1 and the box cover 2 is provided with a sealing boss 1b and a sealing groove 2a which are engaged with each other. Figure 6 In the embodiment, the sealing boss 1b is arranged on the box body 1, and the sealing groove 2a is arranged on the box cover 2. This is only a specific example. Conversely, the sealing boss 1b is arranged on the box cover 2, and the sealing groove 2a is arranged on the box body 1, and the effect is the same. The sealing boss 1b is arranged in a complete circle around the joint surface of the box body 1 and the box cover 2, and the sealing groove 2a matched with the sealing boss 1b is the same, and the sealing boss 1b and the sealing groove 2a are also provided with sealant to enhance the sealing effect.

[0055] Based on the setting of the sealing boss 1b and the sealing groove 2a, when the box cover 2 is opened, it is necessary to first translate upward to allow the sealing boss 1b and the sealing groove 2a to disengage from each other, and then the box cover 2 can be rotated. Therefore, ordinary rotating hinges cannot be used on explosion-proof boxes. Common metal explosion-proof boxes all use a special connection structure hanging outside the box body 1. In order to adapt to the production of the metal box body 1, this connection structure is also made of metal. If the plastic box body 1 adopts a traditional metal connection structure, the connection structure will also be severely corroded in a corrosive environment, and only a batch of connection structures made of corrosion-resistant metal materials such as stainless steel can be customized. This poses a great challenge to the layout of the production rhythm and production management.

[0056] The explosion-proof box of the present invention also includes several connecting components connecting the box body 1 and the box cover 2, and the material of the connecting components is plastic. The purpose is to cooperate with the production of the plastic box body 1, and the material of the connecting piece is also changed to plastic. At the same time, the structure and installation method of the connecting component are specifically designed for the plastic connecting piece.

[0057] Specifically, the connection assembly includes a slide 3 mounted on the box body 1, and a connection shaft 4 fixedly connected to the box cover 2. At the same time, a downwardly extending mounting groove 1a is provided on the top of the box body 1, and the slide 3 is vertically inserted into the mounting groove 1a to slide with the mounting groove 1a. In terms of function, the mounting groove 1a is not only used to accommodate the slide 3, but also the connection shaft 4 will be accommodated in the mounting groove 1a after the box cover 2 is buckled.

[0058] The slide 3 can slide up and down in the mounting groove 1a, but cannot move left and right or rotate. The slide 3 generally presents a prism or cylindrical structure. Figure 6 The slide 3 shown in the figure is a quadrangular prism structure, and a receiving hole 3c is provided in the middle of the slide 3. The receiving hole 3c is used to receive the connecting shaft 4 on one hand, and the upper part of the first bolt 5 including the bolt head is also received in the bolt hole on the other hand. The bottom of the slide 3 is provided with a blocking structure, and after the slide 3 moves upward, the blocking structure will press against the bolt head of the first bolt 5 to prevent the slide 3 from being separated. After the first bolt 5 is tightened, its bottom will press against the bottom of the threaded hole in which it is located. That is, the first bolt 5 is inserted and tightened to the deepest part of the threaded hole in which it is located.

[0059] like Figure 9-11 As shown in , when the slide 3 is manufactured, the actual existing structure includes the side wall 3a and the bottom plate 3b. The bottom plate 3b itself is a blocking structure, and in order to allow the first bolt 5 to pass through the bottom plate 3b, a through hole is set on the bottom plate 3b. The side wall 3a of the slide 3 is enclosed in the middle to form a receiving hole 3c. A transverse rotating shaft 4b is set on the connecting shaft 4, and the rotating shaft 4b is rotatably mounted on the side wall 3a of the slide 3. Therefore, the function of the side wall 3a is essentially to provide a mounting position for the connecting shaft 4. The connecting shaft 4 can be radially rotatably mounted on the slide 3. The rotation direction of the connecting shaft 4 is the opening direction of the box cover 2. Therefore, under normal circumstances, the box cover 2 will rotate along one side of itself, and the rotation axis of the box cover 2 is horizontal, so the rotation axis 4b of the connecting shaft 4 is also horizontal.

[0060] The box body 1 and the box cover 2 are generally connected by multiple connecting components, such as Figure 3 As shown in , two left and right connection components are used. Specifically, a plurality of connection components are installed at intervals along a straight line on the same side of the box body 1, and the rotating shafts 4b of the plurality of connection components are on the same axis.

[0061] After the first bolt 5 passes through the bottom plate 3b, it is screwed and installed at the bottom of the installation groove 1a. Therefore, a threaded hole is provided at the bottom of the installation groove 1a, or a nut is pre-embedded. The function of the first bolt 5 is to limit the sliding distance of the slide 3 to prevent the slide 3 from leaving the installation groove 1a. Figures 4 to 5 As shown, the movement of the slide 3 in the mounting groove 1a is limited, and the slide 3 can be inserted into the bottom of the mounting groove 1a when it moves downward, and the slide 3 moves upward until the upper surface of the bottom plate 3b of the slide 3 abuts against the bolt head of the first bolt 5. Therefore, by adjusting the length of the first bolt 5, the upward distance of the slide 3 can be adjusted, thereby changing the distance that the box cover 2 is pulled upward when the box cover 2 is opened.

[0062] Since the rotating shaft 4 b of the connecting shaft 4 is arranged horizontally, in order to prevent the connecting shaft 4 from colliding with the sliding seat 3 after rotating, a first avoiding opening 3 a 1 is arranged on the top of the side wall 3 a of the sliding seat 3 . Figure 8 The entire side wall 3a of the slide seat 3 is the first avoidance opening 3a1, so Figure 8 The slide seat 3 has only three side walls 3a. Of course, this is only a specific design solution, and the first avoidance opening 3a1 can be used as long as it can prevent the connecting shaft 4 from colliding with the slide seat 3 when rotating.

[0063] The top of the connecting shaft 4 is fixed to the box cover 2, and the fixing method of the connecting shaft 4 can be fixed by a slot, or bonded with glue, etc. However, the stability of the fixing by the slot or glue is poor. The present invention adopts a method of fixing by a slot in combination with a bolt. Specifically, the box cover 2 is provided with a notch, and the top of the connecting shaft 4 is embedded in the notch on the box cover 2. The notch is provided with a threaded hole. The second bolt 6 is screwed into the threaded hole on the box cover 2. The bolt head at the bottom of the second bolt 6 presses the connecting shaft 4. Since the material of the box cover 2 is plastic, the ability of the second bolt 6 to resist radial force is relatively weak. Therefore, a notch is provided on the box cover 2. The connecting shaft 4 is inserted into the notch for radial limiting. The notch can also prevent the connecting shaft 4 from shaking.

[0064] Specific design to further improve the travel of the box cover 2:

[0065] like Figure 5 As shown in , various electrical control components, such as switches, etc., are generally installed on the box cover 2 of the explosion-proof box. The length of these components is often very long. Therefore, when the box cover 2 is opened, if the upward movement of the box cover 2 is not large enough and the box cover 2 starts to rotate, the components on the box cover 2 are likely to collide with the box wall of the box body 1.

[0066] Therefore, in order to further increase the upward movement of the box cover 2, see Figure 4 to Figure 5The bottom of the connecting shaft 4 is inserted into the slide seat 3 and can slide up and down relative to the slide seat 3. Specifically, a slide groove 3a3 extending up and down is set on the side wall 3a of the slide seat 3, and the connecting shaft 4 is provided with a rotating shaft 4b. The rotating shaft 4b is rotatably installed in the slide groove 3a3, and the rotating shaft 4b can slide up and down along the slide groove 3a3. The maximum upward distance L of the box cover 2 is equal to L1+L2, L1 is the upward stroke of the slide seat 3 itself, and L2 is the distance that the bottom of the connecting shaft 4 slides up and down in the slide groove 3a3 of the slide seat 3. So when the box cover 2 is buckled, as shown in Figure 4 As shown in FIG. 1 , the connecting shaft 4 and the slide 3 are in an overlapped state, and at this time, the entire bottom of the connecting shaft 4 is inserted into the receiving hole 3c of the slide 3. The receiving hole 3c is used to install the first bolt 5 so as to install the slide 3 into the mounting groove 1a, and is also used to accommodate the connecting shaft 4 after descending.

[0067] As mentioned above, the upward distance of the slide 3 is related to the length of the first bolt 5, that is, the position of the top of the first bolt 5 is the highest position of the bottom of the slide 3 after the slide 3 moves upward. Therefore, the length of the first bolt 5 is generally longer, and its top is located in the upper half of the installation groove 1a. Therefore, after the connecting shaft 4 moves downward, its bottom will collide and interfere with the first bolt 5.

[0068] Therefore, the connecting shaft 4 is provided with an avoidance hole 4a extending upward from the bottom, and the top of the first bolt 5 is inserted into the avoidance hole 4a after the connecting shaft 4 moves downward. The second bolt 6 is provided in the avoidance hole 4a. The second bolt 6 passes through the top of the connecting shaft 4 and is screwed to the box cover 2. The second bolt 6 fixes the connecting shaft 4 to the box cover 2. Therefore, the avoidance hole 4a performs two functions at the same time. One is to install the second bolt 6, thereby fixing the connecting shaft 4 to the box cover 2, and the other is to accommodate the bolt head of the first bolt 5. When the second bolt 6 is installed, the connecting shaft 4 and the box cover 2 are tightened and fixed.

[0069] Preferably, the first bolt 5 and the second bolt 6 have the same diameter and the same size of bolt head. The first bolt 5 and the second bolt 6 are only different in length. The first bolt 5 and the second bolt 6 are both standard parts, and various lengths of standard parts can be purchased on the market, so there is no need to customize them separately.

[0070] The rotating shaft 4b is arranged at the bottom of the connecting shaft 4, because the avoidance hole 4a is arranged in the middle of the connecting shaft 4. Therefore, the left and right sides of the bottom of the connecting shaft 4 have outwardly protruding truncated cones as the rotating shaft 4b. The side walls 3a on the left and right sides of the slide seat 3 are provided with sliding grooves 3a3 for installing the rotating shaft 4b. The reason for not using an independent rotating shaft 4b that passes through the connecting shaft 4 is that the independent rotating shaft 4b will block the avoidance hole 4a, which will affect the assembly on the one hand, and affect the insertion of the first bolt 5 into the avoidance hole 4a on the other hand.

[0071] Assembly of explosion-proof box:

[0072] First, if Fig.11 As shown in the figure, the connecting shaft 4 rotates radially backwards, and a second avoidance opening 3a2 is provided on the side wall 3a at the front of the slide seat 3. After the connecting shaft 4 rotates backwards, the avoidance hole 4a on the connecting shaft 4 is aligned with the second avoidance opening 3a2.

[0073] The assembly of the explosion-proof box includes the following steps:

[0074] a. Insert the slide 3 into the installation slot 1a of the box body 1, with the first clearance opening 3a1 of the slide 3 facing the same direction as the opening direction of the box cover 2; then pass the tail of the first bolt 5 through the through hole on the bottom plate 3b and screw it to the bottom of the installation slot 1a. Figure 4 As shown in , when installing the first bolt 5, the first bolt 5 is screwed to the bottom to prevent the first bolt 5 from falling off.

[0075] b. Rotate and install the connecting shaft 4 on the slide 3; in step b, the connecting shaft 4 is installed on the slide 3 by utilizing the large elastic deformation margin of the slide 3 and the connecting shaft 4 made of plastic materials, and by means of extrusion elastic deformation, the rotating shaft 4b at the bottom of the connecting shaft 4 is forcibly pressed into the slide groove 3a3 of the slide 3. Therefore, in addition to avoiding interference when the connecting shaft 4 rotates, the first avoidance opening 3a1 opened at the top of the side wall 3a also increases the elastic deformation amplitude of the side wall 3a of the slide 3, making it more convenient to assemble the connecting shaft 4.

[0076] c. Rotate the connecting shaft 4 so that the avoidance hole 4a of the connecting shaft 4 is aligned with the second avoidance opening 3a2 of the sliding seat 3, and at the same time make the top of the connecting shaft 4 fit the installation position of the connecting shaft 4 on the box cover 2, and then insert the second bolt 6 from the second avoidance opening 3a2 into the avoidance hole 4a, and the tail end of the second bolt 6 passes through the top of the connecting shaft 4 and is screwed to the box cover 2 and tightened.

[0077] When disassembling the explosion-proof box, the steps are reversed. First, align the avoidance hole 4a with the second avoidance opening 3a2, remove the second bolt 6, and then the box cover 2 is detached. Then remove the connecting shaft 4 from the slide seat 3. When disassembling, the side wall 3a of the slide seat 3 needs to be opened to allow the side wall 3a of the slide seat 3 to deform elastically before removing the connecting shaft 4. Finally, remove the first bolt 5 and take out the slide seat 3.

[0078] The present invention designs a plastic connecting component with a small volume and a large stroke in the narrow space of the installation groove 1a. Therefore, many structures on the connecting component have been carefully designed and have multiple functions. Figures 4 to 5 , Figures 8 to 10 As shown, the stroke L of the connecting assembly is much larger than that of common metal connecting parts.

[0079] For example, the receiving hole 3c is used to receive the connecting shaft 4 on the one hand, and the upper part of the first bolt 5 including the bolt head is also received in the bolt hole on the other hand.

[0080] The avoidance hole 4a is used to install the second bolt 6 to fix the connecting shaft 4 to the box cover 2; secondly, the bolt head of the first bolt 5 can be inserted into the avoidance hole 4a after the connecting shaft 4 moves downward.

[0081] The mounting groove 1 a is not only used to accommodate the slide seat 3 , but also the connecting shaft 4 will be accommodated in the mounting groove 1 a after the box cover 2 is buckled.

[0082] The rotating shaft 4b is not an independent rotating shaft 4b inserted on the connecting shaft 4, but is directly integrally formed as a truncated cone extending outward from the bottom of the connecting shaft 4.

[0083] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0085] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An explosion-proof box, comprising a box body (1) and a box cover (2) made of plastic material, wherein the box body (1) and the box cover (2) are respectively provided with a sealing boss (1b) structure and a sealing groove (2a) structure, wherein: The explosion-proof box also includes a plurality of connection components connecting the box body (1) and the box cover (2), wherein the material of the connection components is plastic; the connection components include a slide seat (3) mounted on the box body (1), and a connection shaft (4) fixedly connected to the box cover (2); A downwardly extending mounting groove (1a) is provided at the top of the box body (1), and the slide seat (3) is vertically inserted into the mounting groove (1a) and slidably matched with the mounting groove (1a); the slide seat (3) comprises a side wall (3a) and a bottom plate (3b), and the bottom plate (3b) has a through hole; a first bolt (5) extending upward is screwed and fixed at the bottom of the mounting groove (1a), and the first bolt (5) passes through the through hole of the bottom plate (3b) and extends into the slide seat (3); the slide seat (3) can be inserted into the bottom of the mounting groove (1a) when it moves downward, and the slide seat (3) moves upward to the upper surface of the bottom plate (3b) and abuts against the bolt head of the first bolt (5); The connecting shaft (4) is radially rotatably mounted on the sliding seat (3), and a first avoidance opening (3a1) is provided on the top of the side wall (3a) of the sliding seat (3); The connecting shaft (4) is provided with an avoidance hole (4a) extending upward from the bottom, and a second bolt (6) is provided in the avoidance hole (4a). The second bolt (6) passes through the top of the connecting shaft (4) and is screwed to the box cover (2). The second bolt (6) fixes the connecting shaft (4) to the box cover (2); The connecting shaft (4) rotates backwards around its own radial direction, and a second avoidance opening (3a2) is provided on the side wall (3a) at the front of the sliding seat (3); after the connecting shaft (4) rotates backwards, the avoidance hole (4a) on the connecting shaft (4) is aligned with the second avoidance opening (3a2); The box cover (2) has a notch, and the top of the connecting shaft (4) is embedded in the notch on the box cover (2); the notch has a threaded hole, and the second bolt (6) is screwed into the threaded hole on the box cover (2), and the bolt head at the bottom of the second bolt (6) presses the connecting shaft (4).

2. The explosion-proof box according to claim 1, characterized in that: The bottom of the connecting shaft (4) is inserted into the sliding seat (3) and can slide up and down relative to the sliding seat (3); A sliding groove (3a3) extending up and down is arranged on the side wall (3a) of the sliding seat (3); a rotating shaft (4b) is provided on the connecting shaft (4); the rotating shaft (4b) is rotatably installed in the sliding groove (3a3), and the rotating shaft (4b) can slide up and down along the sliding groove (3a3).

3. The explosion-proof box according to claim 2, characterized in that: The left and right sides of the bottom of the connecting shaft (4) have outwardly protruding truncated cones as rotating shafts (4b), and the left and right side walls (3a) of the sliding seat (3) have sliding grooves (3a3) for installing the rotating shafts (4b).

4. The explosion-proof box according to claim 1, characterized in that: When the connecting shaft (4) moves downward, the top of the first bolt (5), including the bolt head, is inserted into the avoidance hole (4a) of the connecting shaft (4).

5. The explosion-proof box according to claim 1, characterized in that: The plurality of connection components are installed at intervals along a straight line on the same side of the box body (1), and the rotating shafts (4b) of the plurality of connection components are on the same axis.

6. A method for assembling the explosion-proof box as claimed in claim 1, characterized in that: The following steps are involved: a. Insert the slide seat (3) into the installation groove (1a) of the box body (1), with the first avoidance opening (3a1) of the slide seat (3) facing in the same direction as the opening direction of the box cover (2); then pass the tail end of the first bolt (5) through the through hole on the bottom plate (3b) and screw it to the bottom of the installation groove (1a); b. Rotate and install the connecting shaft (4) onto the sliding seat (3); c. Rotate the connecting shaft (4) so ​​that the avoidance hole (4a) of the connecting shaft (4) is aligned with the second avoidance hole (3a2) of the slide seat (3), and at the same time, make the top of the connecting shaft (4) fit the installation position of the connecting shaft (4) on the box cover (2), and then insert the second bolt (6) from the second avoidance hole (3a2) into the avoidance hole (4a), and the tail of the second bolt (6) passes through the top of the connecting shaft (4) and is screwed to the box cover (2) and tightened.

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