Universal flameproof enclosure mechanical interlocking mechanism

Abstract

The present invention relates to the technical field of flameproof enclosures for electromagnetic starters used in coal mines, and specifically to a universal flameproof enclosure mechanical interlocking mechanism, which is used for mechanical interlocking protection between a flameproof door body and an isolating switch. The universal flameproof enclosure mechanical interlocking mechanism is composed of an isolating cam, an active connecting plate, a rotating shaft, a connecting block, an unlocking cam, an unlocking handle, an isolating handle, etc. The staff can adjust the positions of the isolating cam and the unlocking cam by manipulating the isolating handle and the unlocking handle outside the flameproof enclosure, control the switching and on-off of the isolating switch, and at the same time drive the active connecting plate to move, conduct or block the movement path of the rotating shaft, and then reliably control the opening and closing of the flameproof door body. The present invention has a simple structure, is easy to operate, is safe and reliable, has good versatility and expansibility, can meet the interlocking requirements of flameproof door bodies and isolating switches of various quantities, various arrangements, and various forms, and eliminates accidents of electric shock or door opening failure caused by misoperation.

Description

Technical Field

[0001] The invention relates to the technical field of flameproof enclosures for electromagnetic starters used in underground coal mines, and in particular to a universal flameproof enclosure mechanical interlocking mechanism used for mechanical interlocking protection between a flameproof door body and an isolating switch of a flameproof enclosure of an electromagnetic starter used in underground coal mines. Background Art

[0002] The flameproof of electrical equipment used in underground coal mines has always been an important guarantee for safe production in coal mines. According to GB3836.2, the quick-opening door or cover of the flameproof enclosure used in underground coal mines should have a reliable mechanical interlock with the isolating switch to achieve "open the door when power is off, and power is supplied when the door is closed" to ensure the safety of underground electricity. In recent years, with the development of automation and heavy-duty coal mining equipment, more and more motors need to be controlled and protected by electromagnetic starters, and some control circuits have reached more than a dozen, and the volume of the flameproof enclosure has increased accordingly. At the same time, due to the limitations of tunnel space, shell structure, door shaft strength, etc., the number of flameproof quick-opening doors used for assembly and maintenance has also increased. At present, the mechanical interlocking mechanism of the flameproof enclosure of the electromagnetic starter used in underground coal mines, most of which can only interlock one flameproof door body at the same time. The Chinese invention patent with the publication number CN103093986B adopts a connecting rod mechanism, but it can only interlock two flameproof door bodies at the same time. For the interlocking of three or more flameproof door bodies, the existing structure can no longer meet the requirements. In addition, the existing mechanical interlocking mechanisms are only designed for specific quantities and layouts. When the number of explosion-proof doors that need to be interlocked increases or the layout of the door and the isolating switch changes, they need to be redesigned. Moreover, after the mechanical interlocking mechanism is unlocked, the explosion-proof quick-opening door often needs to move horizontally, vertically, or rotationally for a short period of time before it can break free from the restrictions of the door fastening device (buckle strip) and finally open the door. The existing mechanical interlocking mechanism is generally only suitable for one of the translation modes, with poor versatility and low degree of standardization, which brings many inconveniences to manufacturing, storage, maintenance and other work. Summary of the invention

[0003] In order to solve the above problems existing in the existing flameproof enclosure mechanical interlocking mechanism of electromagnetic starter used in coal mines, the present invention provides a universal flameproof enclosure mechanical interlocking mechanism, which can realize reliable mechanical interlocking of flameproof door bodies and disconnectors in various quantities, arrangements and forms by simply adjusting the movable connecting plate. The purpose of the present invention is achieved through the following technical solutions:

[0004] A universal flameproof enclosure mechanical interlocking mechanism comprises an isolation cam, an active link plate, a rotating shaft, a connecting block, an unlocking cam, an unlocking handle and an isolation handle. The first end of the active link plate is provided with a plurality of square grooves, and the isolation cam is placed in the square grooves; the second end of the active link plate is provided with a plurality of conducting holes, and the connecting block is provided with a through hole, and the rotating shaft passes through the through hole and the conducting hole to connect the connecting block and the active link plate; the third end of the active link plate is also provided with a groove, and the unlocking cam is placed in the groove.

[0005] Furthermore, the isolation cam is a circular single-sided trimming structure, the square groove is an external square of the isolation cam, and is slightly larger by 1-2 mm, so that the isolation cam can rotate around the center of the circle at any angle between 0° and 360°. A first connecting hole is provided at the center of the isolation cam, and a first explosion-proof hole is provided in the flameproof housing. The isolation handle passes through the first explosion-proof hole, the first connecting hole and the isolation switch shift shaft, and the isolation switch shift shaft, the isolation cam and the isolation handle are fixedly connected as a whole, and the whole is pivotally connected to the flameproof housing.

[0006] Furthermore, the shaft is provided with threads, the flameproof housing is provided with a first threaded hole, and the shaft passes through the first threaded hole and is pivotally connected to the flameproof housing. A slot is provided at the top of the shaft for positioning a tool that drives the shaft to rotate.

[0007] Furthermore, second connection holes are provided on both sides of the connection block, and a second threaded hole is provided on the explosion-proof door body. Bolts pass through the second connection holes and the second threaded holes to detachably fix the connection block to the explosion-proof door body.

[0008] Furthermore, the unlocking cam is a structure of two unequal circles being tangent to each other, and the groove is an circumscribed square of the maximum contour of the unlocking cam, and is slightly larger by 1-2 mm, so that the unlocking cam can rotate 0-90° around the center of the circle. The stroke of the unlocking cam is equal to that of the isolation cam. A third connecting hole is provided at the center of the unlocking cam, and a second explosion-proof hole is provided in the explosion-proof housing. The unlocking handle passes through the second explosion-proof hole and the third connecting hole, and the unlocking cam and the unlocking handle are fixedly connected together, and the whole is pivotally connected to the explosion-proof housing.

[0009] Furthermore, the flameproof enclosure is provided with a guide device, and the movable connecting plate is placed in the guide device, so that the movable connecting plate can move accurately and reliably along the path of the guide device.

[0010] When the universal flameproof enclosure mechanical interlocking mechanism of the present invention is used, under normal working power supply conditions, the isolation handle 9 is rotated to control the on / off, reversing, testing and other gear conversions of the isolation switch. When the door needs to be opened for maintenance, all isolation handles 9 are placed in the "power off" gear, and the unlocking handle 8 is rotated to drive the movable connecting plate 4 to move to the left. At this time, if any isolation handle 9 is not placed in the "power off" gear, the unlocking handle 8 cannot drive the movable connecting plate 4 to move, eliminating the possibility of opening the door with power. Next, the rotating shaft 5 is rotated until the flameproof door body 2 is unlocked. At the same time, the rotating shaft 5 enters the conducting hole 42, locking the movement of the movable connecting plate 4, ensuring that the flameproof enclosure always remains in the power-off state under the door opening condition, ensuring the personal safety of the operator. After the maintenance is completed, all flameproof door bodies 2 are closed in place, the rotating shaft 5 is rotated, the flameproof door body 2 is locked again, and the restriction on the movable connecting plate 4 is released at the same time, the unlocking handle 8 is rotated in the reverse direction, driving the movable connecting plate 4 to move to the right, and the isolation handle 9 resumes power supply and reversing operation. Likewise, if any of the flameproof door bodies 2 is not closed and locked, the isolation handle 9 cannot resume the rotational power supply operation, thereby ensuring the flameproof performance of the housing when powered on.

[0011] The beneficial effects of the present invention are mainly manifested in: a universal explosion-proof box mechanical interlocking mechanism with simple structure, safety and reliability, excellent versatility and expansion performance, capable of meeting the requirements of mechanical interlocking of explosion-proof enclosures with various quantities, arrangements and forms of explosion-proof door bodies, eliminating accidents of electric shock or explosion failure caused by misoperation during underground operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings constituting the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 A schematic diagram of the arrangement of the present invention in a flameproof enclosure when in power supply state (the front wall of the enclosure is hidden);

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 3 It is a three-dimensional structure exploded diagram of the present invention;

[0016] Figure 4 It is a schematic diagram of the posture of the present invention in the power supply state;

[0017] Figure 5 This is a schematic diagram of the position of the isolating switches of the present invention when all are in the "power off" position;

[0018] Figure 6 Schematic diagram of the posture of the present invention when unlocking;

[0019] Figure 7 A lateral schematic diagram of the present invention in a power supply working state;

[0020] Figure 8 A side schematic diagram of the present invention when the door is unlocked;

[0021] Fig. 9 A schematic diagram of a modified design structure of the present invention;

[0022] Fig.10 A schematic diagram of a modified design structure of the present invention;

[0023] In the figure: 1. flameproof casing, 11. first flameproof hole, 12. first threaded hole, 13. second flameproof hole, 14. guide device, 15. casing positioning surface, 2. flameproof door body, 21. second threaded hole, 3. isolation cam, 31. first connecting hole, 32. section, 33. arc surface, 4. movable connecting plate, 41. square groove, 411. first limiting surface, 42. conducting hole, 43. groove, 44. surface, 5. rotating shaft, 51. thread, 52. slot, 53. second limiting surface, 54. third limiting surface, 6. connecting block, 61. through hole, 62. second connecting hole, 63. second contour surface, 7. unlocking cam, 71. third connecting hole, 72. first contour surface, 8. unlocking handle, 9. isolation handle. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. The technical solutions in the embodiments of the present invention are described completely and clearly below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all.

[0025] Specific operation process: General flameproof enclosure mechanical interlocking mechanism, such as Figure 1-3 As shown, it includes an isolation cam 3, an active connecting plate 4, a rotating shaft 5, a connecting block 6, an unlocking cam 7, an unlocking handle 8 and an isolation handle 9. The first end of the active connecting plate 4 is provided with a plurality of square grooves 41, and the cam 3 is placed in the square grooves 41; the second end of the active connecting plate 4 is provided with a plurality of conducting holes 42; the connecting block 6 is detachably fixed to the flameproof door body 2 by bolts, and a through hole 61 is provided in the middle, and the rotating shaft 5 passes through the through hole 61 and the conducting hole 42 to connect the connecting block 6 and the active connecting plate 4. The third end of the active connecting plate 4 is also provided with a groove 43, and the unlocking cam 7 is placed in the groove 43. The unlocking handle 8 is fixedly connected to the unlocking cam 7, and the whole is pivotally connected to the flameproof housing 1, and the isolation handle 9 is fixedly connected to the isolation cam 3 and the isolating switch shaft, and the whole is pivotally connected to the flameproof housing 1. The installation requirement is that when all isolating switches are in the "power off" gear, the section 32 of the isolation cam 3 is parallel to the first limit surface 411, and in the same direction as the guide device 14.

[0026] When the flameproof electrical equipment is working normally, Figure 1 , 2 As shown in Figures 4 and 7, the flameproof door body 2 is completely closed and locked, the isolating switch is in the power-on state, and the rotating shaft 5 is located in the first threaded hole 12 and the through hole 61, locking the movement of the flameproof door body 2. When the isolating switch needs to be shifted, the isolating handle 9 outside the flameproof shell 1 is rotated to drive the isolating switch gear shaft to rotate, thereby completing the reversing or test operation of the isolating switch. At the same time, the isolating cam 3 changes its position accordingly. When it is necessary to open the door for inspection, all the isolating handles 9 are switched to the "power-off" gear, and the flameproof shell is powered off. At this time, all the cut surfaces 32 are parallel to the first limit surface 411, and the movable connecting plate 4 moves to the left to unlock, as shown in Figures 4 and 7. Figure 5 As shown. The unlocking cam 7 is rotated counterclockwise by 180°. Driven by the first contour surface 72, the movable connecting plate 4 moves leftward, the cut surface 32 coincides with the first limit surface 411, the rotation of the isolation cam 3 is restricted, and the isolation switch remains in the "power-off" state. At the same time, as the movable connecting plate 4 moves leftward, the conductive hole 42 coincides with the center of the through hole 61, and the motion path of the rotating shaft 5 is conductive, as shown. Figure 6 As shown. Rotate the shaft 5. Under the action of the thread, the shaft 5 gradually screws out of the through hole 61 and enters the conducting hole 42. Under the joint action of the first threaded hole 12, the conducting hole 42 and the shaft 5, the movement of the connecting plate 4 is firmly locked, completely blocking the possibility of restoring power to the isolating switch due to misoperation of the unlocking handle 9 when the door is opened for maintenance, thereby ensuring the personal safety of the operator. Continue to rotate the shaft 5. When the third limit surface 54 coincides with the surface 44, the rotation stops, the shaft 5 completely exits the through hole 61, loses the locking effect on the connecting block 6, and the quick-open door body is unlocked. Figure 8 The handle of the flameproof door body 2 is operated to make it move in a translational manner and escape from the restriction of the door body fastening device, and the flameproof door body 2 is finally opened.

[0027] like Figure 4 As shown, for a flameproof enclosure with two or more isolating switches, before opening the door, if any isolating switch is not switched to the "power off" position, the arc surface 33 of the isolating cam 3 to which it belongs is always in contact and tangent to the first limit surface 411, limiting the leftward movement of the movable connecting plate 4. Due to the limitation of the surface 44, the rotating shaft 5 cannot exit the through hole 61, and the locking effect on the connecting block 6, i.e., the flameproof door body 2, is always maintained, reliably ensuring the requirement of "the enclosure maintains flameproof performance until the isolating switch is disconnected". Figure 7 shown.

[0028] After the inspection is completed, all the flameproof door bodies 2 are closed and pushed into the accurate locking position, the through hole 61 coincides with the center of the corresponding first threaded hole 12 again, and the movement path of the shaft 5 is open. The shaft 5 is rotated in the opposite direction, and under the action of the thread, the shaft 5 enters the corresponding through hole 61 again to re-lock the flameproof door body; at the same time, the shaft 5 gradually withdraws from the conducting hole 42, and when the second limit surface 53 coincides with the housing positioning surface 15, as shown in FIG. Figure 7 As shown, the rotation stops, the shaft 5 completely exits the conducting hole 42, and the restriction on the movable connecting plate 4 is released. Then, the unlocking handle 8 is rotated 180° clockwise, and driven by the first contour surface 72, the movable connecting plate 4 moves to the right, the cut surface 32 separates from the first limit surface 411, and the isolation cam 3 rotates and unlocks. Rotate the isolation handle 9, the isolating switch resumes closing and power transmission, and free gear conversion can be performed. At the same time, the conducting hole 42 moves to the right with the movable connecting plate 4, and is misaligned with the first threaded hole 12, and the path for the shaft 5 to exit the through hole 61 is blocked, and the flameproof door body 2 is always firmly locked during the entire power-on period. It can be seen from the above process that for a flameproof enclosure with two or more flameproof door bodies 2, the rightward movement of the movable connecting plate 4 can be unlocked only when and only when the shafts 5 of all flameproof door bodies 2 have all entered the through hole 61 and have all exited the conducting hole 42. As long as any of the flameproof door bodies 2 is not closed in place, the conducting hole 43 and the through hole 61 to which it belongs will not be coaxial, and the rotating shaft 5 to which it belongs will not be able to withdraw from the conducting hole 42, and the movement restriction of the movable connecting plate 4 will still be maintained, and the isolating switch will not be able to perform power supply operation, thereby ensuring the requirement that "the isolating switch can only be closed when the door or cover maintains flameproof performance".

[0029] In addition, when the universal flameproof enclosure mechanical interlocking mechanism of the present invention is specifically used, the isolation cam 3, the rotating shaft 5, the connecting block 6, the unlocking cam 7, the unlocking handle 8 and the switch handle 9 can all be set as universal standard parts. Different flameproof products can be designed for mechanical interlocking of flameproof door bodies 2 and isolating switches of various quantities and arrangements in accordance with the number and arrangement requirements of their isolating switches and flameproof door bodies by simply adjusting the size and shape of the movable connecting plate 4, and the number and distribution of the square grooves 41 and the conducting holes 42. For example, Fig. 9 , 10 As shown, it is completely unrestricted by whether the flameproof door body is bolted or unlocked by translation such as left and right, up and down, or rotation. While ensuring the reliability of the mechanism, it reduces the difficulty of design and increases the versatility of the mechanism.

[0030] Next, the specific connection method of the baffle is further described.

[0031] The cam 3 is a circular single-sided trimming structure, and the square groove 41 is an external square of the cam 3, which is slightly larger by 1-2 mm, so that the cam 3 can rotate around the center of the circle at any angle between 0° and 360°. Restricted by the arc surface 33, the movable connecting plate 4 can only move linearly away from or close to the cutting surface 32. When there are two or more disconnectors, only when all the cutting surfaces 32 are in the same position and parallel to the first limit 411, that is, when the housing is powered off, can the movable connecting plate 4 move linearly along the guide direction, which reliably ensures that the power is turned off before the door is opened.

[0032] A first connection hole 31 is provided at the center of the isolation cam 3, a first explosion-proof hole 11 is provided in the flameproof housing 1, and the isolation handle 9 passes through the first explosion-proof hole 11, the first connection hole 31 and the isolating switch shift shaft, and the isolating switch shift shaft, the isolation cam 3 and the switch handle 9 are fixed together, and the whole rotates synchronously in the first explosion-proof hole 11. The staff operates the isolation handle 9 outside the flameproof housing 1 to switch the gear of the isolating switch, and controls the position of the isolation cam 3 at the same time, so that when the isolating switch is in the "power-off" gear, the movement direction of the movable connecting plate 4 is consistent with the guide device.

[0033] The rotating shaft 5 is provided with a thread 51, and the flameproof housing 1 is provided with a first threaded hole 12. The rotating shaft 5 passes through the first threaded hole 12 and is pivotally connected to the flameproof housing 1 to achieve accurate and reliable movement of the rotating shaft 5. A slot 52 is provided at the top of the rotating shaft 5 for tool positioning to facilitate the rotation operation of the rotating shaft 5.

[0034] The connection block 6 is provided with second connection holes 62 on both sides, and the flameproof door body 2 is provided with second threaded holes 21. Bolts pass through the second connection holes 62 and the second threaded holes 21 to detachably fix the connection block 6 to the flameproof door body 2. By changing the shape of the second contour surface 63, the connection block 6 can be fitted with any shape of the flameproof door body 2, thereby improving the versatility of the connection block 6. Furthermore, the through hole 61 is a cylindrical pair, and under the action of the rotating shaft 5, the three degrees of freedom of the flameproof door body 2 in the flameproof plane can be simultaneously limited, that is, the locking requirements for various flameproof quick-opening door bodies that are horizontal, vertical, or rotational and translational to disengage from the fastening device are simultaneously met.

[0035] The unlocking cam 7 is a structure of two unequal circles being tangent to each other. The square groove 43 is a circumscribed square of the maximum contour of the unlocking cam 7, and is slightly larger by 1-2 mm, so that the movable connecting plate 4 can be rotated 0-90° around the center of the circle, ensuring that the movable connecting plate 4 can only move along the guide direction. The stroke of the unlocking cam 7 is equal to that of the isolation cam 3, ensuring the motion accuracy of the entire mechanical interlocking mechanism. A third connecting hole 71 is provided at the center of the unlocking cam 7, and a second flameproof hole 13 is provided at the flameproof housing 1. The unlocking handle 8 passes through the second flameproof hole 13 and the third connecting hole 71, and the unlocking cam 7 inside the flameproof housing 1 and the unlocking handle 8 outside are fixed together, and can be rotated as a whole in the second flameproof hole 13. When the unlocking handle 9 is rotated, the movable connecting plate 4 is stationary within the range of 0-90°, and within the range of 90°-180°, the movable connecting plate 4 is driven to move reliably under the action of the first contour surface 72 and the guide device 14.

[0036] The flameproof enclosure 1 is provided with a guide device 14. The movable connecting plate 4 is restricted by the guide device 14 and moves reliably strictly along the guide path, thereby ensuring the movement precision and accuracy of the entire mechanism.

[0037] For a housing with limited assembly, the movable connecting plate 4 can also be made into a splicing structure.

[0038] It should be understood that the above description is only a preferred embodiment of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Universal flameproof enclosure mechanical interlocking mechanism, characterized by: It comprises an isolating cam (3), a movable connecting plate (4), a rotating shaft (5), a connecting block (6), an unlocking cam (7), an unlocking handle (8) and an isolating handle (9); A plurality of square grooves (41) are formed at the first end of the movable connecting plate (4), and the isolation cam (3) is placed in the square grooves (41); The second end of the movable connecting plate (4) is provided with a plurality of conducting holes (42), the connecting block (6) is provided with a through hole (61), and the rotating shaft (5) passes through the through hole (61) and the conducting holes (42) to connect the connecting block (6) and the movable connecting plate (4); The third end of the movable connecting plate (4) is further provided with a groove (43), and the unlocking cam (7) is placed in the groove (43); The isolation cam (3) is a circular single-sided trimmed structure, and the square groove (41) is an externally circumscribed square of the isolation cam (3) and is slightly larger by 1-2 mm, so that the isolation cam (3) can rotate around the center of the circle at any angle between 0° and 360°; The isolation cam (3) has a first connection hole (31) at the center of the circle, the flameproof housing (1) has a first flameproof hole (11), the isolation handle (9) passes through the first flameproof hole (11), the first connection hole (31) and the isolating switch shift shaft, the isolating switch shift shaft, the isolation cam (3) and the isolation handle (9) are fixedly connected as a whole, and the whole is pivotally connected to the flameproof housing (1); The rotating shaft (5) is provided with a thread (51), the flameproof casing (1) is provided with a first threaded hole (12), and the rotating shaft (5) passes through the first threaded hole (12) and is pivotally connected to the flameproof casing (1); A slot (52) is provided on the top of the rotating shaft (5) for positioning a tool for driving the rotating shaft (5) to rotate; The connection block (6) is provided with second connection holes (62) on both sides, and the flameproof door body (2) is provided with second threaded holes (21), and bolts are passed through the second connection holes (62) and the second threaded holes (21) to detachably fix the connection block (6) to the flameproof door body (2); The unlocking cam (7) is a structure of two unequal circles being tangent to each other, and the groove (43) is a circumscribed square of the maximum contour of the unlocking cam (7) and is slightly larger by 1-2 mm, so that the unlocking cam (7) can rotate 0-90° around the center of the circle; The unlocking cam (7) and the isolation cam (3) have the same stroke; A third connection hole (71) is formed at the center of the unlocking cam (7), a second explosion-proof hole (13) is formed in the explosion-proof housing (1), and the unlocking handle (8) passes through the second explosion-proof hole (13) and the third connection hole (71), so that the unlocking cam (7) and the unlocking handle (8) are fixedly connected together and are pivotally connected to the explosion-proof housing (1) as a whole; The flameproof enclosure (1) is provided with a guide device (14), and the movable connecting plate (4) is placed in the guide device (14), so that the movable connecting plate (4) moves accurately and reliably along the path of the guide device (14).

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