Explosion-proof button box applied to crane control

Abstract

The utility model relates to an explosion-proof button box applied to crane control, which is designed for solving the problem that the existing button box is poor in performance in a combustible dust environment or a combustible gas environment. An existing button head and an existing contact module are used. The explosion-proof button box comprises a shell which is formed by combining an upper shell and a lower shell, a sealing ring is arranged at the joint of the upper shell and the lower shell, a lower packing body is installed in the lower shell, a contact module is installed in the lower packing body, and a plurality of screw holes are formed in the upper shell and used for arranging button heads; a plurality of rectangular counter bores for arranging contact modules are formed in the top surface of the lower filler body, wire holes are formed in the side surfaces of the short edges, penetrate through all the rectangular counter bores and are communicated with one another, and the end parts of the wire holes are sealed and filled; and the material covering plate covers the top surface of the lower packing body, so that the rectangular counter bore forms a sealed cavity.

Description

Technical Field

[0001] The invention relates to the field of button boxes, and in particular to an explosion-proof button box used for crane control. Background Art

[0002] The button box is a common industrial control device, mainly used in the operation of mechanical equipment. Traditional button boxes are usually sealed with rubber rings, which are sufficient for conventional working environments. However, in combustible dust environments or combustible gas environments, due to the gaps in the button heads, these combustible and explosive gases / dusts may still enter the button box, especially some popular spliced ​​button boxes. The increase in the number of button heads required for multi-section splicing and the splicing gaps are where the above situation occurs. For this reason, it is necessary to design a button box that separately seals the button contact module into a closed chamber to meet explosion-proof requirements. Summary of the invention

[0003] The utility model is an explosion-proof button box for crane control, which is designed to solve the problem that the existing button box performs poorly in a combustible dust environment or a combustible gas environment, and uses the existing button head and contact module.

[0004] An explosion-proof button box used for crane control is suitable for circuits with a rated voltage of 380V and a rated current of 10A at an AC of 50Hz; it is suitable for environments of explosive gas environments or combustible dust environments of groups T1 to T6 of IIA, IIB, and IIC.

[0005] The explosion-proof button box comprises: a shell, which is composed of an upper and lower shell, a sealing ring is arranged at the connection between the upper and lower shells, a lower filler body is installed in the lower shell, a contact module is installed in the lower filler body, and a plurality of screw holes are opened on the upper shell for setting the button head;

[0006] The top surface of the lower filler body is provided with a plurality of rectangular countersunk holes for setting the contact module, and the side surface of the short side is provided with a wire hole, which penetrates all the rectangular countersunk holes and makes them interconnected, and the ends of the wire holes are closed and filled;

[0007] The covering plate covers the top surface of the lower filler body, so that the rectangular countersunk hole forms a sealed chamber.

[0008] Preferably, the cover plate is made of soft plastic, the thickness of the cover plate is between 2mm-10mm, and a plurality of groups of grooves and protrusions are provided at corresponding positions of the contact modules, wherein the grooves and protrusions are on the same vertical line, the grooves cooperate with the contact modules, and the protrusions cooperate with the button heads.

[0009] The extruded button head directly triggers the contact module. In the present application, the through groove can prevent the contact module from being accidentally triggered, and the protrusion can compensate for the protrusion structure of the original contact module, so that the button head can normally trigger the contact module through the cover plate.

[0010] The selection range of soft plastics includes: silicone, PVC soft rubber, butadiene rubber, styrene butadiene rubber, and propylene rubber.

[0011] Preferably, an upper filler body is provided in the shell, the upper filler body and the lower filler body are made of the same material, and a through hole is provided on the vertical surface of the upper filler body corresponding to the screw hole.

[0012] The lower filler body is pressed against the covering plate by the pressure of the upper filler body; a groove is arranged along the top surface of the lower filler body, and the groove is used for sealing with the extruded and deformed covering plate.

[0013] When the upper filler body is not used, a circle of protrusions needs to be provided on the shell along the edge of the upper shell for pressing.

[0014] If pressing is not used, glue / hot melt is required for gluing.

[0015] Preferably, a first permanent magnet is arranged in the through hole of the upper filler body, a second permanent magnet is arranged in the sealed chamber of the lower filler body, and the first permanent magnet cooperates with the first permanent magnet;

[0016] A slide groove is arranged on the side wall of the upper filler body, a slide block is embedded in the slide groove, and a first permanent magnet is installed and fixed in the slide block;

[0017] A slide groove is arranged on the side wall of the lower filler body, a sliding block is embedded in the slide groove, and a second permanent magnet is installed and fixed in the sliding block.

[0018] Preferably, the shell and the lower filler body are made of SMC material or DMC material and are manufactured by die casting.

[0019] Different isolation schemes can be selected for different buttons. For the emergency stop button, only the indirect contact method of soft plastic cover plate is recommended to ensure safety. For the other rotary buttons or trigger buttons, two different isolation schemes can be used.

[0020] The beneficial effects of the present invention are: The button box is an integral type, not a spliced ​​type in the existing market. The button box can work in a gas explosion-proof or combustible dust environment. The button box is installed with a large number of switches and can control complex equipment. It can move with the operator within its working range to facilitate the operation of the equipment. Explosion-proof level of the button box: Ex db eb IIC T6Gb / Ex tD IIIC T80℃ IP66 Db; in compliance with explosion-proof specifications such as GB / T3638.1-2021, GB / T3638.2-2021, GB / T3638.3-2021; the equipment can work in open-air areas, with a protection level of IP66 and an anti-corrosion level of WF2. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of the button box of Example 1;

[0022] Figure 2 Permanent magnet matching diagram in Example 2;

[0023] In the figure: 1. cable entry device, 2. button head, 3. sealing chamber, 4. lower shell, 5. upper shell, 6. lower filler body, 7. upper filler body, 8. covering plate, 9. contact module, 10. slider fixed by the first permanent magnet, 11. slider fixed by the second permanent magnet. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example

[0025] like Figure 1 As shown, the explosion-proof button box used for crane control uses the existing button head 2 and contact module, including:

[0026] The shell is composed of an upper and lower shell, a sealing ring is arranged at the connection of the upper and lower shells, a lower stuffing body is installed in the lower shell 4, a contact module is installed in the lower stuffing body 6, and a plurality of screw holes are opened on the upper shell 5 for setting the button head; a cable introduction device 1 is arranged at the end of the lower shell, and an explosion-proof stuffing box is adopted. The explosion-proof stuffing box is made of nickel-plated brass or stainless steel and is a clamping sealing joint.

[0027] The top surface of the lower filler body is provided with a plurality of rectangular countersunk holes for setting the contact module, and the side surface of the short side is provided with a wire hole, which penetrates all the rectangular countersunk holes and makes them interconnected, and the ends of the wire holes are closed and filled;

[0028] The covering plate covers the top surface of the lower filler body, so that the rectangular countersunk hole forms a sealed chamber 3.

[0029] The cover plate 8 is made of soft plastic and has a thickness of 3 mm. Several groups of grooves and protrusions are provided at corresponding positions of the contact modules, wherein the grooves and protrusions are on the same vertical line, the grooves cooperate with the contact modules, and the protrusions cooperate with the button heads.

[0030] The lower filler body of the shell is pressed together with the covering plate; the shell and the lower filler body are made of SMC material or DMC material and are manufactured by die casting.

[0031] A peripheral groove is arranged on the top surface of the lower filler body along the lower filler body, and the groove is used for sealing with the extruded and deformed covering plate.

[0032] An upper filler body is arranged in the housing, and the upper filler body 7 and the lower filler body are made of the same material, and a through hole is arranged on the vertical surface of the upper filler body corresponding to the screw hole. The lower half of the button head is inserted into the through hole. Example

[0033] like Figure 2 As shown, the difference between this embodiment and embodiment 1 is that the first permanent magnet and the second permanent magnet are added, and the thickness and material requirements of the cover plate are reduced. The deformation of the cover plate is replaced by the cooperation of the permanent magnets.

[0034] A first permanent magnet is arranged in the through hole of the upper filler body, a second permanent magnet is arranged in the sealed chamber of the lower filler body, and the first permanent magnet cooperates with the first permanent magnet;

[0035] A slide groove is arranged on the side wall of the upper filler body, a slide block is embedded in the slide groove, and a first permanent magnet is installed and fixed in the slide block;

[0036] A slide groove is arranged on the side wall of the lower filler body, a sliding block is embedded in the slide groove, and a second permanent magnet is installed and fixed in the sliding block.

[0037] When the button head 2 is pressed, the slider 10 fixed by the first permanent magnet is pushed to slide downward, and the slider 11 fixed by the second permanent magnet is controlled to be pushed downward, thereby triggering the contact module 9.

[0038] When the button head is reset, the second permanent magnet is reset under the action of the reset spring of the contact module, pushing the first permanent magnet to reset.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An explosion-proof button box for crane control, using existing button heads and contact modules, characterized in that: include: The housing is composed of an upper and lower housing, a sealing ring is provided at the connection between the upper and lower housings, a lower filler body is installed in the lower housing, a contact module is installed in the lower filler body, and a plurality of screw holes are opened on the upper housing for setting a button head; The top surface of the lower filler body is provided with a plurality of rectangular countersunk holes for setting the contact module, and the side surface of the short side is provided with a wire hole, which penetrates all the rectangular countersunk holes and makes them interconnected, and the ends of the wire holes are closed and filled; The covering plate covers the top surface of the lower filler body, so that the rectangular countersunk hole forms a sealed chamber.

2. The explosion-proof button box for crane control according to claim 1 is characterized in that: The cover plate is made of soft plastic, and the thickness of the cover plate is between 2mm and 10mm. Several groups of grooves and protrusions are arranged at the corresponding positions of the contact modules, wherein the grooves and protrusions are on the same vertical line, the grooves cooperate with the contact modules, and the protrusions cooperate with the button heads.

3. The explosion-proof button box for crane control according to claim 2 is characterized in that: The filling body under the shell is pressed with the covering plate; A peripheral groove is arranged on the top surface of the lower filler body along the lower filler body, and the groove is used for sealing with the extruded and deformed covering plate.

4. The explosion-proof button box for crane control according to claim 1 is characterized in that: An upper filling body is arranged in the shell body. The upper filling body and the lower filling body are made of the same material. A through hole is arranged on the vertical surface of the upper filling body corresponding to the screw hole.

5. The explosion-proof button box for crane control according to claim 4 is characterized in that: A first permanent magnet is arranged in the through hole of the upper filler body, a second permanent magnet is arranged in the sealed chamber of the lower filler body, and the first permanent magnet cooperates with the first permanent magnet; A slide groove is arranged on the side wall of the upper filler body, a slide block is embedded in the slide groove, and a first permanent magnet is installed and fixed in the slide block; A slide groove is arranged on the side wall of the lower filler body, a sliding block is embedded in the slide groove, and a second permanent magnet is installed and fixed in the sliding block.

6. The explosion-proof button box for crane control according to claim 1 is characterized in that: The shell and the lower filler body are made of SMC material or DMC material and are manufactured by die casting.

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