CN216353871U - Explosion-proof button device for small-size explosion-proof instrument - Google Patents
Explosion-proof button device for small-size explosion-proof instrument Download PDFInfo
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- CN216353871U CN216353871U CN202122476663.9U CN202122476663U CN216353871U CN 216353871 U CN216353871 U CN 216353871U CN 202122476663 U CN202122476663 U CN 202122476663U CN 216353871 U CN216353871 U CN 216353871U
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Abstract
The utility model discloses an explosion-proof button device for a small-size explosion-proof instrument, belonging to the technical field of explosion-proof buttons; the anti-explosion device comprises an anti-explosion shell, wherein at least one copper shaft is vertically matched and connected in the anti-explosion shell, a metal dome sheet is arranged at the upper end of the copper shaft, a PET film is arranged at the upper end of the metal dome sheet, and the PET film is adhered to the anti-explosion shell; the lower end face of the explosion-proof shell is fixedly connected with a copper column, and a threaded hole is tapped in the copper column and extends into the explosion-proof shell; the lower end of the explosion-proof shell is provided with a circuit board, the circuit board is connected with a key switch which is correspondingly contacted with the copper shaft, and the circuit board is fixedly connected to the explosion-proof shell through a bolt. The utility model forms a key shaft structure by the matching contact of the copper shaft and the key switch, and touches the switch circuit on the circuit board by the contact pin on the key switch, thereby reducing the key layout of the explosion-proof product to a smaller range, increasing the protection grade of the product to the grade of IP68, and being more suitable for the design and application of explosion-proof instrument products.
Description
Technical Field
The utility model relates to an explosion-proof button used for an instrument in an explosion-proof place, in particular to an explosion-proof button device for a small-size explosion-proof instrument, and belongs to the technical field of explosion-proof buttons.
Background
The explosion-proof button who uses on explosion-proof switch board, explosion-proof control box at present: one is an explosion-proof button with larger volume, and the other is a button with a key shaft and a threaded sleeve, so that the explosion-proof button with small volume is very inconvenient to use, and the IP67 and higher protection requirements of the equipment cannot be realized by the two existing button structures structurally.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: the explosion-proof button device for the small-size explosion-proof instrument is characterized in that a copper shaft is in matched contact with a key switch to form a key shaft structure, a contact pin on the key switch touches a switch circuit on a circuit board, and the key shaft structure can reduce the key layout of an explosion-proof product to a smaller range and meet the protection requirements of equipment IP67 and even IP 68.
In order to achieve the purpose, the utility model adopts the following technical scheme: an explosion-proof button device for an explosion-proof instrument with small volume comprises an explosion-proof shell, wherein the upper end surface of the explosion-proof shell is provided with a flat groove, and an I-shaped shaft hole is vertically communicated and arranged in the flat groove; a metal dome sheet is connected in a transverse groove at the upper end of the I-shaped shaft hole in a matching manner, a PET film is arranged at the upper end of the metal dome sheet and is pasted in the flat groove, a copper shaft is arranged at the lower end of the metal dome sheet, and the copper shaft is connected to the middle lower part in the I-shaped shaft hole in a matching manner; a copper column is fixedly connected to the lower end face of the explosion-proof shell, a threaded hole is tapped in the copper column and extends into the explosion-proof shell; the lower extreme of explosion-proof shell sets up the circuit board, connects the key switch who corresponds the contact with the copper axle on the circuit board, still is provided with the screw that corresponds with the screw hole on the circuit board and passes through bolt fixed connection on explosion-proof shell.
The key switch comprises a base, a key handle and an upper cover, wherein the key handle and the upper cover are arranged at the upper end of the base, and a positioning column and a contact pin are arranged at the lower end of the base; the key switch is in contact connection with the copper shaft through a key handle and is fixedly connected to the circuit board through a contact pin.
The type of the key switch adopts a micro key switch with the size of 12 multiplied by 12 mm.
The metal dome sheet is a metal dome elastic sheet with the diameter of 12mm, the thickness of 0.4mm and the force of 250 gf; the height of the transverse groove at the upper end of the I-shaped shaft hole is not less than the thickness of the snap pieces.
At least one copper shaft is arranged in the explosion-proof shell, and the fit clearance between the copper shaft and the middle part of the I-shaped shaft hole is smaller than 0.08 mm.
The copper shaft and the copper column are both made of pure copper materials, and the explosion-proof shell is made of carbon steel or stainless steel.
The utility model has the beneficial effects that: 1) the copper shaft and the key switch are in matched contact to form a key shaft structure, and the contact pin on the key switch is used for touching the switch circuit on the circuit board, compared with the existing thread sleeve button and the button recovered by a spring, the contact pin can provide resilience force to enable the copper shaft to reset and have a self-recovery function, the small-size key shaft structure can arrange the keys of an explosion-proof product in a smaller range, and the protection grade of the product is improved to the grade of IP68, so that the copper shaft structure is more suitable for the design and application of explosion-proof instrument products.
2) After the PET sticking film is stuck to the explosion-proof shell, the waterproof requirement of the product can be met; the selective use of the snap dome can prevent the condition that the button does not rebound after the PET film is deformed for a long time, and can ensure that a human hand has good contact feeling when pressing the button.
3) The explosion-proof shell made of carbon steel or stainless steel, the copper shaft and the copper column are used, so that the condition that the key cannot be bounced due to rusting and adhesion in a long-time gap can be effectively prevented, and the service life of the key shaft structure is ensured.
4) The key switch provided by the utility model provides resilience force for the copper shaft to reset through the contact pin, saves the design of a resilience structure, and directly fixes the circuit board on the explosion-proof shell through the bolt, so that the structural connection is more exquisite and compact, and the sensitivity requirement of the key is met while the size of the device is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
fig. 2 is a schematic structural diagram of the key switch in fig. 1.
In the figure, 1-an explosion-proof shell, 101-a flat groove, 102-an I-shaped shaft hole, 103-a threaded hole, 2-a PET film, 3-a snap dome, 4-a copper shaft, 5-a copper column, 6-a circuit board, 7-a key switch, 701-a base, 702-a key handle, 703-an upper cover, 704-a positioning column and 705-a contact pin.
Detailed Description
The utility model is further explained below with reference to the figures and the embodiments.
Example (b): as shown in fig. 1 and 2, the explosion-proof button device for the small-size explosion-proof instrument provided by the utility model comprises an explosion-proof housing 1, wherein a flat groove 101 is formed in the upper end surface of the explosion-proof housing 1, and an i-shaped shaft hole 102 is vertically communicated and arranged in the flat groove 101; a metal dome 3 is connected in a matching mode in a transverse groove at the upper end of an I-shaped shaft hole 102, a PET film 2 is arranged at the upper end of the metal dome 3, the PET film 2 is pasted in a flat groove 101, a copper shaft 4 is installed at the lower end of the metal dome 3, the copper shaft 4 is connected to the middle lower portion of the I-shaped shaft hole 102 in a matching mode, and a key allowance is reserved between the copper shaft 4 and the transverse groove at the lower end of the I-shaped shaft hole 102.
The metal dome 3 adopts a metal dome elastic sheet with the diameter of 12mm, the thickness of 0.4mm and the force of 250 gf; the height of the transverse groove at the upper end of the I-shaped shaft hole 102 is not less than the thickness of the snap dome 3.
At least one copper shaft 4 is arranged in the explosion-proof shell 1, and the fit clearance between the copper shaft 4 and the middle part of the I-shaped shaft hole 102 is less than 0.08 mm.
The copper shaft 4 and the copper column 5 are both made of pure copper, and the explosion-proof shell 1 is made of carbon steel or stainless steel.
The lower end face of the explosion-proof shell 1 is fixedly connected with a copper column 5, and a threaded hole 103 is tapped in the copper column 5 and extends into the explosion-proof shell 1; the lower extreme of explosion-proof shell 1 sets up circuit board 6, connects the key switch 7 that corresponds the contact with copper axle 4 on the circuit board 6, still offers the screw that corresponds with screw hole 103 on the circuit board 6 and passes through bolt 8 fixed connection on explosion-proof shell 1.
The type of the key switch 7 adopts a microswitch with 12 multiplied by 12 mm; the key switch 7 comprises a base 701, a key handle 702 arranged at the upper end of the base 701, an upper cover 703, a positioning column 704 arranged at the lower end of the base 701 and a contact pin 705; the key switch 7 is in contact connection with the copper shaft 4 through a key handle 702 and is fixedly connected to the circuit board 6 through a contact pin 705.
The working principle is as follows:
an operator presses a switch, the copper shaft 4 is pushed to move downwards through the deformation of the dome sheet 3, and a key switch in contact with the copper shaft 4 moves downwards to enable a contact pin 705 to be linked with an internal micro switch to act and feed back to a switch circuit control system on a circuit board, so that the action and parameter change of equipment are realized; meanwhile, the microswitch can provide the copper shaft 4 with resilience force of 2.5-3N, so that the copper shaft is reset.
The copper shaft and the key switch are in matched contact to form a key shaft structure, and the contact pin on the key switch is used for touching the switch circuit on the circuit board, compared with the existing thread sleeve button and the button recovered by a spring, the contact pin can provide resilience force to enable the copper shaft to reset and have a self-recovery function, the small-size key shaft structure can arrange the keys of an explosion-proof product in a smaller range, and the protection grade of the product is improved to the grade of IP68, so that the copper shaft structure is more suitable for the design and application of explosion-proof instrument products.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides an explosion-proof button device for explosion-proof instrument of little volume which characterized in that: the anti-explosion device comprises an anti-explosion shell (1), wherein a flat groove (101) is formed in the upper end face of the anti-explosion shell (1), and an I-shaped shaft hole (102) is vertically communicated and formed in the flat groove (101); the upper end of the I-shaped shaft hole (102) is connected with a metal dome sheet (3) in a transverse groove in a matching manner, the upper end of the metal dome sheet (3) is provided with a PET film (2), the PET film (2) is pasted in a flat groove (101), the lower end of the metal dome sheet (3) is provided with a copper shaft (4), and the copper shaft (4) is connected with the middle lower part in the I-shaped shaft hole (102) in a matching manner; the lower end face of the explosion-proof shell (1) is fixedly connected with a copper column (5), a threaded hole (103) is tapped in the copper column (5) and extends into the explosion-proof shell (1); the lower end of the explosion-proof shell (1) is provided with a circuit board (6), the circuit board (6) is connected with a key switch (7) which is in corresponding contact with the copper shaft (4), and the circuit board (6) is also provided with a screw hole which corresponds to the threaded hole (103) and is fixedly connected onto the explosion-proof shell (1) through a bolt (8).
2. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 1, wherein: the key switch (7) comprises a base (701), a key handle (702) arranged at the upper end of the base (701), an upper cover (703), a positioning column (704) arranged at the lower end of the base (701) and a contact pin (705); the key switch (7) is in contact connection with the copper shaft (4) through a key handle (702) and is fixedly connected to the circuit board (6) through a contact pin (705).
3. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 2, wherein: the type of the key switch (7) adopts a microswitch with the size of 12 multiplied by 12 mm.
4. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 1, wherein: the height of the transverse groove at the upper end of the I-shaped shaft hole (102) is not less than the thickness of the snap dome (3).
5. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 1 or 4, wherein: the metal dome sheet (3) adopts a metal dome elastic sheet with the diameter of 12mm, the thickness of 0.4mm and the force of 250 gf.
6. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 1, wherein: at least one copper shaft (4) is arranged in the explosion-proof shell (1), and the fit clearance between the copper shaft (4) and the middle part of the I-shaped shaft hole (102) is less than 0.08 mm.
7. An explosion-proof button device for a small-sized explosion-proof instrument according to claim 1, wherein: copper axle (4) and copper post (5) all adopt pure copper material to make, explosion-proof housing (1) adopts carbon steel or stainless steel to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122476663.9U CN216353871U (en) | 2021-10-14 | 2021-10-14 | Explosion-proof button device for small-size explosion-proof instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122476663.9U CN216353871U (en) | 2021-10-14 | 2021-10-14 | Explosion-proof button device for small-size explosion-proof instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216353871U true CN216353871U (en) | 2022-04-19 |
Family
ID=81176219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122476663.9U Active CN216353871U (en) | 2021-10-14 | 2021-10-14 | Explosion-proof button device for small-size explosion-proof instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216353871U (en) |
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2021
- 2021-10-14 CN CN202122476663.9U patent/CN216353871U/en active Active
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