EP2348523B1 - Explosion-proof key switch. - Google Patents

Explosion-proof key switch. Download PDF

Info

Publication number
EP2348523B1
EP2348523B1 EP10826012.6A EP10826012A EP2348523B1 EP 2348523 B1 EP2348523 B1 EP 2348523B1 EP 10826012 A EP10826012 A EP 10826012A EP 2348523 B1 EP2348523 B1 EP 2348523B1
Authority
EP
European Patent Office
Prior art keywords
rotating shaft
switch
explosion
switch seat
annular disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10826012.6A
Other languages
German (de)
French (fr)
Other versions
EP2348523A1 (en
EP2348523A4 (en
Inventor
Xiaoping Huang
Qiangli Wu
Zhenming Hu
Xuan Zhang
Qunxing He
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangcha Group Co Ltd
Original Assignee
Hangcha Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangcha Group Co Ltd filed Critical Hangcha Group Co Ltd
Publication of EP2348523A1 publication Critical patent/EP2348523A1/en
Publication of EP2348523A4 publication Critical patent/EP2348523A4/en
Application granted granted Critical
Publication of EP2348523B1 publication Critical patent/EP2348523B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/06—Key inserted and then turned to effect operation of the switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H01H9/042—Explosion-proof cases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/50—Driving mechanisms, i.e. for transmitting driving force to the contacts with indexing or locating means, e.g. indexing by ball and spring

Definitions

  • the present invention relates to an explosion-proof key switch, which is mainly applied to explosion-proof vehicles in various explosive gas environments.
  • a key switch is an essential electrical element for starting vehicles.
  • conventional key switches cannot be used at all.
  • no true explosion-proof key switch is available commercially.
  • present key switches for explosion-proof vehicles some key switches are operated by the conventional key switch driving a set of lever mechanism to switch on/off self-made contacts, which have complex structures and are bulky and extremely prone to failure; some key switches need several actions to start vehicles, which is inconvenient for operation.
  • the technical problem to be solved by the invention is to provide an explosion-proof key switch with a simple structure, a low cost, a reliable work and a convenient operation.
  • the technical solution of the invention is to provide an explosion-proof key switch including a switch seat and a cover plate, wherein a switch lock core and a rotating shaft connected with each other are provided in the switch seat, an output end of the rotating shaft extends through the cover plate to the outside of the switch seat, a microswitch fit with the output end of the rotating shaft is mounted on the cover plate, characterized in that an input end of the rotating shaft is mounted in the switch seat by a copper jacket sleeved on the rotating shaft, both a clearance between the copper jacket and the rotating shaft and a clearance between the copper jacket and the switch seat have a width less than 0.2mm and a length larger than 12.5mm, a notch is provided on an end surface of the output end of the rotating shaft, an rolling wheel being in contact with a longitudinal cutting surface of the notch is provided at one side of a drive end of an elastic rod mounted on the microswitch, and the other side of the drive end of the elastic rod is in contact with a movable contact.
  • the middle portion of the rotating shaft is provided with an annular disc which has a diameter larger than the diameter of the rotating shaft and is formed integrally with the rotating shaft.
  • the annular disc is embedded in a space between the switch seat and the cover plate. Two recesses are provided on an end surface of the annular disc.
  • a blind hole is correspondingly provided in the switch seat, and a spring and a steel ball are placed in the blind hole.
  • a positioning pin being axially symmetrical to the blind hole is mounted in the switch seat.
  • An elongate groove fit with the positioning pin is provided in the annular disc, and a maximum rotatable angle of the positioning pin within the elongate groove is the same as an angle between the two recesses with respect to an axis of the annular disc.
  • the switch lock core and the rotating shaft are connected together by a protrusion-groove structure.
  • the input end of the rotating shaft is mounted in the switch seat by the copper jacket sleeved on the rotating shaft, and the clearances between the copper jacket and the rotating shaft, the switch seat have a width less than 0.2mm and a length larger than 12.5mm, so as to effectively prevent explosive flame of explosive gas mixture from extending to the exterior through clearances between components of the switch.
  • the present invention adopts the conventional key switch and the microswitch to achieve the explosion-proof function of the system, which has a simple structure, a convenient operation, a low cost and a convenient maintenance.
  • the embodiment has a switch seat 2 and a cover plate 6.
  • a switch lock core 1 and a rotating shaft 7 connected with each other are provided in the switch seat 2.
  • the switch lock core 1 and the rotating shaft 7 are connected with each other by a protrusion-groove structure, such that the rotating shaft 7 may be rotated together with the switch lock core 1 under the action of the switch lock core 1.
  • the output end of the rotating shaft 7 extends through the cover plate 6 to the outside of the switch seat 2.
  • a microswitch 9 fit with the output end of the rotating shaft 7 is mounted on the cover plate 6.
  • An input end of the rotating shaft 7 is mounted on the switch seat 2 via a copper jacket 5 sleeved on the rotating shaft 7.
  • Both a clearance between the copper jacket 5 and the rotating shaft 7 and a clearance between the copper jacket 5 and the switch seat 2 have a width of 0.1mm and a length of 25mm. Since the clearances are very narrow and their length is relatively long (in comparison with the clearance width of 0.1mm), it is possible to effectively prevent explosive flame from extending to the exterior, so as to achieve the explosion-proof effect.
  • a notch 14 is provided on the end surface of the output end of the rotating shaft 7.
  • a rolling wheel 15 being in contact with the longitudinal cutting surface of the notch 14 is provided at one side of a drive end of an elastic rod 16 mounted on the microswitch 9, and the other side of the drive end of the elastic rod 16 is in contact with a movable contact 17.
  • the middle portion of the rotating shaft 7 is provided with an annular disc 10 which has an diameter larger than the diameter of the rotating shaft 7 and is formed integrally with the rotating shaft 7.
  • the annular disc is embedded in the space between the switch seat 2 and the cover plate 6, so that the rotating shaft 7 can rotate only around its axis.
  • Two recesses 11 are provided on an end surface of the annular disc.
  • a blind hole 12 is provided in the switch seat 2, and a spring 3 and a steel ball 4 are placed in the blind hole 12.
  • a positioning pin 8 being axially symmetrical to the blind hole 12 is mounted in the switch seat 2.
  • An elongate groove 13 fit with the positioning pin 8 is provided in the annular disc 10.
  • the maximum rotatable angle of the positioning pin 8 within the elongate groove 13 is the same as an angle between the two recesses 11 with respect to the axis of the annular disc 10.
  • the operation principle of the embodiment is as follows.
  • the whole switch is installed in an explosion-proof instrument box 18, wherein the switch seat 2 and the explosion-proof instrument box 18 are connected together by screws and the clearance therebetween has a width of 0.1mm and a length of 25mm, which is the same as the requirement of the clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2 respectively, so as to achieve the explosion-proof effect.
  • the steel ball 4 is located in one of the recesses 11, and the positioning pin 8 abuts against one limit end of the elongate groove.
  • the key When being operated, the key is inserted into the switch lock core 1 and then is turned to rotate the rotating shaft 7, so that the rolling wheel 15 moves from the notch 14 onto the outer circumferential surface of the rotating shaft 7 and the elastic rod 16 is deformed to come close to the body of the microswitch 9, so as to push the movable contact 17 to actuate, thereby switching the power on.
  • the elongate clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2, and the elongate clearance between the switch seat 2 and the explosion-proof instrument box 18 are used to achieve the explosion-proof of the system.
  • the steel ball 4 comes into the other recess 11, which not only achieves a good hand feeling of a driver at the on/off position but also may hold the switch in the position, and the positioning pin 8 abuts against the other limit ends so as to prevent the excessive operation.
  • the switch is required to be turned off, the key is rotated in a reverse direction, so that the rotating shaft 7 is rotated in the reverse direction and the rolling wheel 15 moves from the outer circumferential surface of the rotating shaft 7 to the notch 14.
  • the elastic rod 16 is returned under the action of its own elastic force, namely moves far away from the body of the microswitch 9, and the movable contact 17 is simultaneously returned under the action of its own elastic force, so that the power is switched off.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Description

    FIELD OF THE INVENTION
  • The present invention relates to an explosion-proof key switch, which is mainly applied to explosion-proof vehicles in various explosive gas environments.
    • BACKGROUND OF THE INVENTION
  • A key switch is an essential electrical element for starting vehicles. However, for various work vehicles containing a mixture of explosive gases, conventional key switches cannot be used at all. Moreover, at present, no true explosion-proof key switch is available commercially. Among present key switches for explosion-proof vehicles, some key switches are operated by the conventional key switch driving a set of lever mechanism to switch on/off self-made contacts, which have complex structures and are bulky and extremely prone to failure; some key switches need several actions to start vehicles, which is inconvenient for operation.
    • SUMMARY OF THE INVENTION
  • The technical problem to be solved by the invention is to provide an explosion-proof key switch with a simple structure, a low cost, a reliable work and a convenient operation.
  • The technical solution of the invention is to provide an explosion-proof key switch including a switch seat and a cover plate, wherein a switch lock core and a rotating shaft connected with each other are provided in the switch seat, an output end of the rotating shaft extends through the cover plate to the outside of the switch seat, a microswitch fit with the output end of the rotating shaft is mounted on the cover plate, characterized in that an input end of the rotating shaft is mounted in the switch seat by a copper jacket sleeved on the rotating shaft, both a clearance between the copper jacket and the rotating shaft and a clearance between the copper jacket and the switch seat have a width less than 0.2mm and a length larger than 12.5mm, a notch is provided on an end surface of the output end of the rotating shaft, an rolling wheel being in contact with a longitudinal cutting surface of the notch is provided at one side of a drive end of an elastic rod mounted on the microswitch, and the other side of the drive end of the elastic rod is in contact with a movable contact.
  • The middle portion of the rotating shaft is provided with an annular disc which has a diameter larger than the diameter of the rotating shaft and is formed integrally with the rotating shaft. The annular disc is embedded in a space between the switch seat and the cover plate. Two recesses are provided on an end surface of the annular disc. A blind hole is correspondingly provided in the switch seat, and a spring and a steel ball are placed in the blind hole.
  • A positioning pin being axially symmetrical to the blind hole is mounted in the switch seat. An elongate groove fit with the positioning pin is provided in the annular disc, and a maximum rotatable angle of the positioning pin within the elongate groove is the same as an angle between the two recesses with respect to an axis of the annular disc.
  • The switch lock core and the rotating shaft are connected together by a protrusion-groove structure.
  • The invention has some advantageous effects. In the invention, the input end of the rotating shaft is mounted in the switch seat by the copper jacket sleeved on the rotating shaft, and the clearances between the copper jacket and the rotating shaft, the switch seat have a width less than 0.2mm and a length larger than 12.5mm, so as to effectively prevent explosive flame of explosive gas mixture from extending to the exterior through clearances between components of the switch. The present invention adopts the conventional key switch and the microswitch to achieve the explosion-proof function of the system, which has a simple structure, a convenient operation, a low cost and a convenient maintenance.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a front sectional view of the invention; and
    • Fig. 2 is a top view of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
  • As shown in Figs. 1 and 2, the embodiment has a switch seat 2 and a cover plate 6. A switch lock core 1 and a rotating shaft 7 connected with each other are provided in the switch seat 2. In this embodiment, the switch lock core 1 and the rotating shaft 7 are connected with each other by a protrusion-groove structure, such that the rotating shaft 7 may be rotated together with the switch lock core 1 under the action of the switch lock core 1. The output end of the rotating shaft 7 extends through the cover plate 6 to the outside of the switch seat 2. A microswitch 9 fit with the output end of the rotating shaft 7 is mounted on the cover plate 6. An input end of the rotating shaft 7 is mounted on the switch seat 2 via a copper jacket 5 sleeved on the rotating shaft 7. Both a clearance between the copper jacket 5 and the rotating shaft 7 and a clearance between the copper jacket 5 and the switch seat 2 have a width of 0.1mm and a length of 25mm. Since the clearances are very narrow and their length is relatively long (in comparison with the clearance width of 0.1mm), it is possible to effectively prevent explosive flame from extending to the exterior, so as to achieve the explosion-proof effect. A notch 14 is provided on the end surface of the output end of the rotating shaft 7. A rolling wheel 15 being in contact with the longitudinal cutting surface of the notch 14 is provided at one side of a drive end of an elastic rod 16 mounted on the microswitch 9, and the other side of the drive end of the elastic rod 16 is in contact with a movable contact 17.
  • The middle portion of the rotating shaft 7 is provided with an annular disc 10 which has an diameter larger than the diameter of the rotating shaft 7 and is formed integrally with the rotating shaft 7. The annular disc is embedded in the space between the switch seat 2 and the cover plate 6, so that the rotating shaft 7 can rotate only around its axis. Two recesses 11 are provided on an end surface of the annular disc. Correspondingly, a blind hole 12 is provided in the switch seat 2, and a spring 3 and a steel ball 4 are placed in the blind hole 12. When the switch reaches on/off position, the steel ball 4 enters into one of the recesses 11 under an elastic force of the spring 3, so as to achieve a good hand feeling of a driver at the on/off position.
  • A positioning pin 8 being axially symmetrical to the blind hole 12 is mounted in the switch seat 2. An elongate groove 13 fit with the positioning pin 8 is provided in the annular disc 10. The maximum rotatable angle of the positioning pin 8 within the elongate groove 13 is the same as an angle between the two recesses 11 with respect to the axis of the annular disc 10. When the switch reaches the on/off position, the positioning pin 8 reaches one of the two limit positions of the elongate groove 13, so as to prevent an excessive operation.
  • The operation principle of the embodiment is as follows. In practical use, the whole switch is installed in an explosion-proof instrument box 18, wherein the switch seat 2 and the explosion-proof instrument box 18 are connected together by screws and the clearance therebetween has a width of 0.1mm and a length of 25mm, which is the same as the requirement of the clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2 respectively, so as to achieve the explosion-proof effect. When the switch is in the off state, the steel ball 4 is located in one of the recesses 11, and the positioning pin 8 abuts against one limit end of the elongate groove. When being operated, the key is inserted into the switch lock core 1 and then is turned to rotate the rotating shaft 7, so that the rolling wheel 15 moves from the notch 14 onto the outer circumferential surface of the rotating shaft 7 and the elastic rod 16 is deformed to come close to the body of the microswitch 9, so as to push the movable contact 17 to actuate, thereby switching the power on. The elongate clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2, and the elongate clearance between the switch seat 2 and the explosion-proof instrument box 18 are used to achieve the explosion-proof of the system. At the same time, the steel ball 4 comes into the other recess 11, which not only achieves a good hand feeling of a driver at the on/off position but also may hold the switch in the position, and the positioning pin 8 abuts against the other limit ends so as to prevent the excessive operation. When the switch is required to be turned off, the key is rotated in a reverse direction, so that the rotating shaft 7 is rotated in the reverse direction and the rolling wheel 15 moves from the outer circumferential surface of the rotating shaft 7 to the notch 14. Thus, the elastic rod 16 is returned under the action of its own elastic force, namely moves far away from the body of the microswitch 9, and the movable contact 17 is simultaneously returned under the action of its own elastic force, so that the power is switched off.

Claims (4)

  1. An explosion-proof key switch comprising a switch seat (2) and a cover plate (6), wherein a switch lock core (1) and a rotating shaft (7) connected with each other are provided in the switch seat (2), an output end of the rotating shaft (7) extends through the cover plate (6) to the outside of the switch seat (2), a microswitch (9) fit with the output end of the rotating shaft (7) is mounted on the cover plate (6), characterized in that an input end of the rotating shaft (7) is mounted in the switch seat (2) by a copper jacket (5) sleeved on the rotating shaft (7), both a clearance between the copper jacket (5) and the rotating shaft (7) and a clearance between the copper jacket (5) and the switch seat (2) have a width less than 0.2mm and a length larger than 12.5mm, a notch (14) is provided on an end surface of the output end of the rotating shaft (7), an rolling wheel (15) being in contact with a longitudinal cutting surface of the notch (14) is provided at one side of a drive end of an elastic rod (16) mounted on the microswitch (9), and the other side of the drive end of the elastic rod (16) is in contact with a movable contact (17).
  2. The explosion-proof key switch according to claim 1, wherein the middle portion of the rotating shaft (7) is provided with an annular disc (10) which has a diameter larger than the diameter of the rotating shaft (7) and is formed integrally with the rotating shaft (7), the annular disc is embedded in a space between the switch seat (2) and the cover plate (6), two recesses (11) are provided on an end surface of the annular disc, a blind hole (12) is correspondingly provided in the switch seat (2), and a spring (3) and a steel ball (4) are placed in the blind hole.
  3. The explosion-proof key switch according to claim 2, wherein a positioning pin (8) being axially symmetrical to the blind hole (12) is mounted in the switch seat (2), an elongate groove (13) fit with the positioning pin (8) is provided in the annular disc (10), and a maximum rotatable angle of the positioning pin (8) within the elongate groove (13) is the same as an angle between the two recesses (11) with respect to an axis of the annular disc (10).
  4. The explosion-proof key switch according to claim 1, 2 or 3, wherein the switch lock core (1) and the rotating shaft (7) are connected with each other by a protrusion-groove structure.
EP10826012.6A 2009-10-28 2010-08-13 Explosion-proof key switch. Active EP2348523B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2009202688735U CN201608087U (en) 2009-10-28 2009-10-28 Anti-explosion key switch
PCT/CN2010/075971 WO2011050649A1 (en) 2009-10-28 2010-08-13 Explosion-proof key switch.

Publications (3)

Publication Number Publication Date
EP2348523A1 EP2348523A1 (en) 2011-07-27
EP2348523A4 EP2348523A4 (en) 2013-12-04
EP2348523B1 true EP2348523B1 (en) 2014-07-30

Family

ID=42952791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10826012.6A Active EP2348523B1 (en) 2009-10-28 2010-08-13 Explosion-proof key switch.

Country Status (3)

Country Link
EP (1) EP2348523B1 (en)
CN (1) CN201608087U (en)
WO (1) WO2011050649A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103723661B (en) * 2012-10-10 2016-05-04 杭叉集团股份有限公司 The dual-purpose explosion-proof battery fork truck of imflammable gas and dust atmosphere
CN103663016A (en) * 2013-12-13 2014-03-26 江苏吉野电气有限公司 Novel elevator locking piece
CN103696630B (en) * 2013-12-13 2016-04-13 江苏吉野电气有限公司 With the novel elevator latch fitting of striking gear
CN107787146A (en) * 2017-12-12 2018-03-09 江苏新力科技实业有限公司 A kind of mine explosion-suppression and intrinsic safety type control cabinet chamber door

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723677A (en) * 1970-01-05 1973-03-27 A Arias Ignition key alarm
DE3521155A1 (en) * 1985-06-13 1986-12-18 Brown, Boveri & Cie Ag, 6800 Mannheim Operating element for an explosion-proof switch
DE9203143U1 (en) * 1992-03-10 1992-06-17 Bär Elektrowerke GmbH & Co KG, 58579 Schalksmühle Electrical switching device
CN2427882Y (en) * 2000-04-26 2001-04-25 光阳工业股份有限公司 Lock for motor cycle main switch
CN201298487Y (en) * 2008-10-27 2009-08-26 常州澳丰机电制造有限公司 Mineral intrinsic safe key switch
CN101699602B (en) * 2009-10-28 2011-11-30 杭叉集团股份有限公司 Explosion-proof key switch

Also Published As

Publication number Publication date
CN201608087U (en) 2010-10-13
EP2348523A1 (en) 2011-07-27
WO2011050649A1 (en) 2011-05-05
EP2348523A4 (en) 2013-12-04

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