Explosion-proof limit switch

Abstract

The utility model relates to an explosion-proof limit switch, which is characterized in that the explosion-proof limit switch comprises an explosion-proof shell, a switch assembly arranged in the explosion-proof shell and a transmission mechanism for driving the switch assembly to realize signal switching, the transmission mechanism and the switch assembly are realized in a rotating mode, and the transmission mechanism comprises a main shaft. And the main shaft extends out of the explosion-proof shell to form an outer operation part so as to realize external driving. The utility model relates to a plurality of forms of explosion-proof limit switches, which can be reasonably used in different occasions, and the internal mechanism reasonably simplifies the rotation complexity of the existing explosion-proof limit switch.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to the field of limit switch, concretely relates to an explosion -proof limit switch; BACKGROUND

[0002] With the development of society, the use of explosion -proof limit switch is more and wide, especially in engineering machinery application is extremely wide, it is a kind of field instrument for signal feedback, to control its stroke or carry out terminal limit protection, the signal feedback explosion -proof limit switch of existing various, with diversity, therefore know the signal feedback explosion -proof limit switch of present basically meets people's demand, but still there are some problems. SUMMARY

[0003] The utility model provides a kind of explosion -proof limit switch to solve above-mentioned technical problem.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] An explosion -proof limit switch, characterized in that, including explosion -proof shell, switch assembly arranged in the inside of explosion -proof shell and the transmission mechanism of driving switch assembly to realize signal switching, wherein transmission mechanism is realized with switch assembly in rotation mode, the transmission mechanism includes main shaft, the main shaft extends to the outside operation part of explosion -proof shell to realize external driving, wherein the main shaft is perpendicular to the upper end surface of explosion -proof shell or perpendicular to the side surface of explosion -proof shell.

[0006] The utility model further provides, the main shaft forms the outside operation part at both ends of explosion -proof shell, the part of the main shaft in the explosion -proof shell is formed with screw rod part, the screw rod part is adaptively provided with worm wheel, the worm wheel is connected with the synchronous rotation worm shaft, the synchronous gear is provided on the worm shaft, the synchronous gear is engaged with transmission gear, the transmission shaft of transmission gear is provided with the first rotating wheel matched with switch assembly, one end of the first rotating wheel is provided with cooperation wheel one, the cooperation wheel one is engaged with cooperation wheel two, the cooperation wheel two is provided with the second rotating wheel synchronous rotation, and the second rotating wheel is matched with switch assembly.

[0007] The utility model further provides, the switch assembly includes the first switch assembly for feeding back first signal and the second switch assembly for feeding back second signal, the first switch assembly is distributed on the rotating path of the first rotating wheel, the second switch assembly is distributed on the rotating path of second rotating wheel, the first switch assembly is matched with the first rotating wheel, and the second switch assembly is matched with the second rotating wheel.

[0008] The utility model further provides, and the flange portion that the first switch assembly and the second switch assembly touch or separate is formed on the first rotating wheel and the second rotating wheel.

[0009] The utility model further provides, the part of main shaft in explosion -proof casing is connected with the rotating disc, the convex block that forms with switch assembly cooperation is formed on the rotating disc, the convex block and switch assembly cooperation make it can feedback first signal and second signal when rotating disc with main shaft rotates.

[0010] The utility model further provides, switch assembly includes first switch assembly and second switch assembly, the convex block includes with first switch assembly adaptation first convex block and second convex block and with second switch assembly adaptation third convex block and fourth convex block, first convex block and third convex block are located on same circle path, second convex block and fourth convex block are located on same circle path, the diameter of two circles is different.

[0011] The utility model further provides, one side of rotating disc is provided with reset component, reset component is sleeved on the shaft sleeve of main shaft, reset component includes front baffle, rear baffle, limit base and reset spring that is arranged between front baffle and rear baffle, when the convex block cooperates with switch assembly, reset spring is in the deformation state, and reset force is provided to main shaft.

[0012] The utility model further provides, both ends of reset component form action arm, limit arm is formed on front baffle and rear baffle, the action arm and limit arm form each other limit.

[0013] The utility model further provides, main shaft connects switch assembly, and switch assembly is change-over switch.

[0014] The utility model further provides, main shaft is connected with cross rod.

[0015] The utility model discloses a variety of forms of explosion -proof limit switch, can be reasonably used for different occasions, wherein the internal mechanism simplifies the complexity of the rotation of the existing explosion -proof limit switch. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application, but do not limit the present application. In the drawings:

[0017] Figure 1 It is the explosion diagram of the utility model embodiment 1.

[0018] Figure 2 It is the structure schematic view of the utility model embodiment 1.

[0019] Figure 3 It is the structure schematic view of the utility model embodiment 2.

[0020] Figure 4 It is the internal structure schematic view of embodiment 2 of the utility model.

[0021] Figure 5 It is the structure schematic view after removing explosion -proof casing of embodiment 2 of the utility model.

[0022] Figure 6 It is the rotation direction schematic view after removing explosion -proof casing of embodiment 2 of the utility model.

[0023] Figure 7 It is the structure schematic view when feedback first signal of embodiment 2 of the utility model.

[0024] Figure 8 It is the side view after removing explosion -proof casing of embodiment 2 of the utility model.

[0025] Figure 9 It is the structure schematic view when feedback second signal of embodiment 2 of the utility model.

[0026] Figure 10 It is the structure schematic view when feedback second signal of embodiment 2 of the utility model.

[0027] Figure 11 It is the structure schematic view of embodiment 3 of the utility model.

[0028] Figure 12 It is the structure schematic view when removing explosion -proof casing of embodiment 3 of the utility model.

[0029] Figure 13 It is the structure schematic view when removing explosion -proof casing of embodiment 3 of the utility model.

[0030] 10, explosion-proof housing; 20, switch assembly; 30, transmission mechanism; 301, main shaft; 302, screw part; 40, cross rod; 401, first rod; 402, second rod; 50, upper mounting seat; 60, lower mounting seat; 70, sealing ring; 80, rocker arm; 90, rotating disc; 100, first switch assembly; 1001, first switch; 1002, second switch; 110, second switch assembly; 1101, third switch; 1102, fourth switch; 120, mounting frame; 1201, bottom plate; 1202, side plate; 130, first protrusion; 140, second protrusion; 150, third protrusion; 160, fourth protrusion; 180, reset assembly; 1801, front baffle; 18011, first limiting arm; 1802, rear baffle; 18021, second limiting arm; 18022, third limiting arm; 18023, fourth limiting arm; 1803, limiting base; 18031, first limiting surface; 18032, second limiting surface; 1804, reset spring; 18041, first acting arm; 18042, second acting arm; 190, worm gear; 200, worm gear shaft; 210, synchronous gear; 220, transmission gear; 230, first rotating wheel; 240, second rotating wheel; 250, matching wheel one; 260, matching wheel two; 270, support frame; 280, upper support plate; 290, middle support plate; 300, lower support plate; 310, flange part; DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail with reference to the drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieves technical effects can be fully understood and implemented.

[0032] Example 1

[0033] Reference Figures 1-2 The present embodiment provides an explosion-proof limit switch, which comprises an explosion-proof housing 10, a switch assembly 20 arranged inside the explosion-proof housing 10, and a transmission mechanism 30 for driving the switch assembly 20 to realize signal switching, wherein the transmission mechanism 30 is realized in a rotating manner with the switch assembly 20, and the transmission mechanism 30 comprises a main shaft 301, which extends to the outside of the explosion-proof housing 10 to form an external operation part to realize external driving, and the main shaft 301 in the present embodiment is arranged vertically to the explosion-proof housing 10.

[0034] The outer operation part in the embodiment is a cross rod 40, wherein the cross rod 40 includes two cross arranged rod members, denoted as a first rod member 401 and a second rod member 402, the first rod member 401 is installed in a corresponding upper mounting seat 50, the upper mounting seat 50 is provided with an embedding groove, the second rod member 402 is installed in a lower mounting seat 60, and the lower mounting seat 60 is also provided with an embedding groove for placing the second rod member 402, the lower mounting seat 60 and the upper mounting seat 50 are coaxially arranged and the main shaft 301 passes through, the lower mounting seat 60 and the upper mounting seat 50 are fastened and connected by bolts and can rotate together with the main shaft 301.

[0035] A sealing ring 70 is arranged on one side of the lower mounting seat 60 for sealing the main shaft 301 and the explosion-proof housing 10, the main shaft 301 is sleeved with a bearing, and the sealing ring 70 wraps the bearing.

[0036] The switch assembly 20 is a change-over switch, which is a prior art and will not be described in detail here.

[0037] Embodiment 2:

[0038] Reference Figures 3-10 The embodiment provides an explosion-proof limit switch, which comprises an explosion-proof housing 10, a switch assembly 20 arranged in the explosion-proof housing 10, and a transmission mechanism 30 for driving the switch assembly 20 to realize signal switching, wherein the transmission mechanism 30 is realized in a rotating manner with the switch assembly 20, the transmission mechanism 30 comprises a main shaft 301, the main shaft 301 extends out of the explosion-proof housing 10 to form an outer operation part to realize external driving.

[0039] The outer operation part in the embodiment is a rocker arm 80, one end of the rocker arm 80 is arranged at an end of the main shaft 301 located outside the explosion-proof housing 10, the rotation of the main shaft 301 is driven by the rocker arm 80, wherein the main shaft 301 is arranged horizontally and penetrates out of the side of the explosion-proof housing 10.

[0040] The part of the main shaft 301 located in the explosion-proof housing 10 is connected with a rotating disc 90, the rotating disc 90 is formed with a protrusion matched with the switch assembly 20, when the rotating disc 90 rotates with the main shaft 301, the protrusion matched with the switch assembly 20 can feedback a first signal and a second signal.

[0041] Specifically, the switch assembly 20 includes a first switch assembly 100 and a second switch assembly 110, which are arranged on a corresponding mounting frame 120 fixed in the explosion-proof housing 10; the mounting frame 120 includes a bottom plate 1201 and a side plate 1202, the side plate 1202 is bent to form a mounting foot for fixing with the explosion-proof housing 10, the first switch assembly 100 and the second switch assembly 110 are arranged on the side plate 1202 formed on both sides of the bottom plate 1201, and the bottom plate 1201 is further provided with a mounting hole for connecting with the upper cover of the explosion-proof housing 10.

[0042] The first switch assembly 100 and the second switch assembly 110 are each provided with two contact switches, the first switch assembly 100 includes a first switch 1001 and a second switch 1002, the second switch assembly 110 includes a third switch 1101 and a fourth switch 1102, the protrusions include a first protrusion 130 and a second protrusion 140 adapted to the first switch assembly 100, and a third protrusion 150 and a fourth protrusion 160 adapted to the second switch assembly 110, the first protrusion 130 and the third protrusion 150 are located on the same circular path, the second protrusion 140 and the fourth protrusion 160 are located on the same circular path, the diameters of the two circles are different, in this embodiment, the diameter of the circle where the first protrusion 130 and the third protrusion 150 are located is greater than the diameter of the circle where the second protrusion 140 and the fourth protrusion 160 are located, in this embodiment, the specific arrangement is that the first protrusion 130 and the third protrusion 150 are located at the edge of the rotating disc 90, and the second protrusion 140 and the fourth protrusion 160 are located closer to the axis of the rotating disc 90; the positions of the protrusions can be arranged according to the positions of the contact switches, and in this embodiment, the contact switches are mechanical switches such as micro-switches with levers, it is worth mentioning that other switches that can meet the signal feedback can also be used, such as proximity switches.

[0043] In addition, due to the different circles where the protrusions are located, the lengths of the protrusions are also different, the length of the protrusion arranged at the edge position is greater than the length of the protrusion arranged at the position close to the axis.

[0044] In addition, in this embodiment, one side of the rotating disc 90 is provided with a reset assembly 180, the reset assembly 180 is sleeved on the shaft sleeve of the main shaft 301, one side of the rotating disc 90 is provided with a reset assembly 180, the reset assembly 180 is sleeved on the shaft sleeve of the main shaft 301, the reset assembly 180 includes a front baffle, a rear baffle 1802, a limiting base 1803, and a reset spring 1804 arranged between the front baffle 1801 and the rear baffle 1802, when the protrusion cooperates with the switch assembly 20, the reset spring 1804 is in a deformed state, and provides a reset force to the main shaft 301.

[0045] Specifically, the return spring 1804 has working arms at both ends, and limit arms are formed on the front baffle 1801 and the rear baffle 1802. The front baffle 1801 has one limit arm, and the rear baffle 1802 has three limit arms. Since the return spring is stationary when the main shaft 301 rotates, the front baffle 1801 and the rear baffle 1802 rotate with the main shaft 301. The working arms include a first working arm 18041 and a second working arm 18042. The upper limit arm on the front baffle 1801 is designated as the first limit arm 18011. The rear baffle 1802 has three limit arms, designated as the second limit arm 18021, the third limit arm 18022, and the fourth limit arm 18023. The third limit arm 18022 is located between the second limit arm 18021 and the fourth limit arm 18023. The limiting base 1803 is fixed inside the explosion-proof housing 10 and protrudes towards the buffer spring. It has a first limiting surface 18031 and a second limiting surface 18032. The first limiting surface 18031 and the second limiting arm 18021 form a limiting function, and the second limiting surface 18032 and the fourth limiting surface form a limiting function.

[0046] The operating principle in this embodiment is as follows:

[0047] In the initial state, the rocker arm 80 is located in the center position, and the rocker arm 80 is facing the first direction (e.g., Figure 8 When rotating (as indicated by the middle arrow), the second protrusion 140 and the fourth protrusion 160 contact the corresponding second switch 1002 and fourth switch 1102, outputting a first signal. At this time, the first limiting arm 18011 of the front baffle 1801 pushes the first acting arm 18041 near the front baffle 1801 to deform, while the second limiting arm 18021 rotates and approaches the second acting arm 18042 until the second limiting arm 18021 is limited by the first limiting surface 18031 of the limiting base 1803 and stops rotating, ensuring the stability and reliability of the main shaft 301 during rotation. At this time, the rocker arm 80 is released. Since the deformation state of the first acting arm 18041 is released and a restoring force is provided, the front baffle 1801 drives the main shaft 301 to return to its initial position. The rocker arm 80 moves in the second direction (such as... Figure 6When rotating (as indicated by the middle arrow), the first protrusion 130 and the third protrusion 150 touch the corresponding first switch 1001 and third switch 1101, outputting a second signal. At this time, the third limiting arm 18022 pushes the second action arm 18042 to deform, the second limiting arm 18021 moves away from the first limiting surface 18031, and the fourth limiting arm 18023 approaches the second action arm 18042 until the second action arm 18042 is limited by the second limiting surface 18032 of the limiting base 1803 and stops rotating. At this time, the rocker arm 80 is released. Since the deformation state of the second action arm 18042 is released and a restoring force is provided, the rear baffle 1802 drives the main shaft 301 to return to the initial position.

[0048] Example 3:

[0049] like Figures 10-13 As shown, this embodiment provides an explosion-proof limit switch, including an explosion-proof housing 10, a switch assembly 20 disposed inside the explosion-proof housing 10, and a transmission mechanism 30 for driving the switch assembly 20 to achieve signal switching. The transmission mechanism 30 is connected to the switch assembly 20 by rotation. The transmission mechanism 30 includes a main shaft 301, which extends to the outside of the explosion-proof housing 10 to form an external operating part for external driving.

[0050] In this embodiment, the main shaft 301 is horizontally arranged and extends from the side of the explosion-proof housing 10. The main shaft 301 forms external operating parts at both ends of the explosion-proof housing 10. The external operating parts can be configured to be manual or electric, and two external operating parts are provided. When one end of the main shaft 301 is unusable, it can be replaced. The applicable scenarios are also more extensive, and it can be installed in different positions or directions according to the specific scenario.

[0051] In this embodiment, the portion of the main shaft 301 located inside the explosion-proof housing 10 forms a screw portion 302. The screw portion 302 is fitted with a worm gear 190. The worm gear 190 is connected to a worm gear 190 shaft that rotates synchronously with it. A synchronous gear 210 is provided on the worm gear 190 shaft. The synchronous gear 210 meshes with a transmission gear 220. A first rotating wheel 230 that cooperates with the switch assembly 20 is provided on the transmission shaft of the transmission gear 220. A first cooperating wheel 250 is provided at one end of the first rotating wheel 230. The first cooperating wheel 250 meshes with a second cooperating wheel 260. The second cooperating wheel 260 is provided with a second rotating wheel 240 that rotates synchronously with it. The second rotating wheel 240 cooperates with the switch assembly 20.

[0052] The switch assembly 20 comprises a first switch assembly 100 for feeding back a first signal and a second switch assembly 110 for feeding back a second signal, wherein the first switch assembly 100 and the second switch assembly 110 are both composed of two contact switches, the first switch assembly 100 is distributed on the rotation path of the first rotating wheel 230, the second switch assembly 110 is distributed on the rotation path of the second rotating wheel 240, the first switch assembly 100 is matched with the first rotating wheel 230, and the second switch assembly 110 is matched with the second rotating wheel 240.

[0053] The first rotating wheel 230 and the second rotating wheel 240 are formed with flange parts 310 which are in contact with or separated from the first switch assembly 100 and the second switch assembly 110.

[0054] The use mode of the embodiment is that the main shaft 301 is driven to rotate in a manual or electric mode, the screw part 302 of the main shaft 301 is matched with the worm wheel 190 to drive the worm wheel 190 to rotate, the synchronous gear 210 coaxial with the worm wheel 190 rotates to drive the transmission gear 220 to rotate, so that the first rotating wheel 230 rotates, when the flange part 310 on the first rotating wheel 230 is in contact with the contact switch of the first switch assembly 100, in the embodiment, the setting direction of the contact switch is consistent with the setting direction of the first rotating wheel 230, that is, the flange part 310 is in the vertical direction, and the contact of the contact switch is located in the normal position of the first rotating wheel 230, therefore, the length and position of the flange part 310 must be ensured to be capable of contacting the contact position of the contact switch at the same time, when the flange part 310 on the first rotating wheel 230 is in contact with the contact switch of the first switch assembly 100, a first signal is output, at this time, the second switch assembly 110 and the corresponding second rotating wheel 240 are in a separated state, when continuing to rotate, the contact of the second switch assembly 110 and the second rotating wheel 240 is met, so that different signals are switched.

[0055] The embodiment is further provided with a support frame 270 for fixing the transmission mechanism 30 and the switch assembly 20, wherein the support frame 270 comprises an upper support plate 280, a middle support plate 290 and a lower support plate 300, the upper support plate 280, the middle support plate 290 and the lower support plate 300 are fixed by fasteners and arranged in the explosion-proof housing 10, wherein the upper support plate 280, the middle support plate 290 and the lower support plate 300 constitute a two-layer structure, one layer is used for placing the worm wheel 190, the main shaft 301, the synchronous gear 210 and the transmission gear 220, and the other layer is used for arranging the switch assembly 20, the first rotating wheel 230 and the second rotating wheel 240.

[0056] The utility model relates to a variety of forms of anti -explosion limit switch can be used reasonably for different occasions, wherein the internal mechanism simplifies the complexity of the rotation of the existing anti -explosion limit switch.

[0057] As used in the description and claims, certain terminology is used to describe particular components. Those of ordinary skill in the art will recognize that different names are often used to describe the same component. Regardless of the nomenclature used, the description and claims herein focus on the functionality of the components, rather than the nomenclature used to describe them. As used throughout this description and in the claims, "comprising" is intended to mean "including but not limited to." "Consisting essentially of" means that the composition or process can include additional components, so long as these additional components do not materially alter the basic and novel characteristics of the described compositions or processes. "Consisting of" means that the composition or process can include only the described components.

[0058] The above description illustrates and describes several preferred embodiments of the present application, but as previously noted, it is not intended to limit the present application to the forms disclosed, as other embodiments are possible. Rather, the scope of the present application is to be measured by the breadth of the claims that follow, and the full scope of equivalents and equivalents thereof. Changes and modifications can be made to the above described embodiments without departing from the spirit and scope of the present application.

Claims

1. An explosion-proof limit switch characterized by comprising: The application relates to an explosion-proof switch, which comprises an explosion-proof shell (10), a switch assembly (20) arranged inside the explosion-proof shell (10), and a transmission mechanism (30) for driving the switch assembly (20) to realize signal switching, wherein the transmission mechanism (30) is arranged in a rotating mode with the switch assembly (20), the transmission mechanism (30) comprises a main shaft (301), the main shaft (301) extends to the outside of the explosion-proof shell (10) to form an external operation part for external driving, and the main shaft is arranged perpendicularly to the upper end surface of the explosion-proof shell or perpendicularly to the side surface of the explosion-proof shell.

2. An explosion-proof limit switch according to claim 1, characterised in that The main shaft (301) forms external operation parts at both ends of the explosion-proof shell (10), the part of the main shaft (301) located inside the explosion-proof shell (10) is provided with a screw rod part (302), the screw rod part (302) is provided with a worm wheel (190), the worm wheel (190) is connected with a worm wheel (190) shaft which rotates synchronously with the worm wheel (190), the worm wheel (190) shaft is provided with a synchronous gear (210), the synchronous gear (210) is engaged with a transmission gear (220), the transmission shaft of the transmission gear (220) is provided with a first rotating wheel (230) matched with the switch assembly (20), one end of the first rotating wheel (230) is provided with a matched wheel one (250), the matched wheel one (250) is engaged with a matched wheel two (260), the matched wheel two (260) is provided with a second rotating wheel (240) which rotates synchronously with the matched wheel two (260), and the second rotating wheel (240) is matched with the switch assembly (20).

3. An explosion-proof limit switch according to claim 2, wherein The switch assembly (20) comprises a first switch assembly (100) for feeding back a first signal and a second switch assembly (110) for feeding back a second signal, the first switch assembly (100) is distributed on the rotating path of the first rotating wheel (230), the second switch assembly (110) is distributed on the rotating path of the second rotating wheel (240), the first switch assembly (100) is matched with the first rotating wheel (230), and the second switch assembly (110) is matched with the second rotating wheel (240).

4. An explosion-proof limit switch according to claim 3, wherein Flange parts (310) which are in contact with or separated from the first switch assembly (100) and the second switch assembly (110) are formed on the first rotating wheel (230) and the second rotating wheel (240).

5. The explosion-proof limit switch of claim 1, wherein The part of the main shaft (301) located inside the explosion-proof shell (10) is connected with a rotating disc (90), the rotating disc (90) is provided with a convex block matched with the switch assembly (20), when the rotating disc (90) rotates with the main shaft (301), the convex block matched with the switch assembly (20) enables the switch assembly (20) to feed back the first signal and the second signal.

6. An explosion-proof limit switch according to claim 5, wherein The switch assembly (20) comprises a first switch assembly (100) and a second switch assembly (110), the protruding blocks comprise a first protruding block (130) and a second protruding block (140) adapted to the first switch assembly (100) and a third protruding block (150) and a fourth protruding block (160) adapted to the second switch assembly (110), the first protruding block (130) and the third protruding block (150) are located on the same circular path, the second protruding block (140) and the fourth protruding block (160) are located on the same circular path, and the diameters of the two circles are different.

7. An explosion-proof limit switch according to claim 6, characterised in that One side of the rotating disc (90) is provided with a reset assembly (180), the reset assembly (180) is sleeved on the shaft sleeve of the main shaft (301), the reset assembly (180) comprises a front baffle, a rear baffle (1802), a limiting base (1803) and a reset spring (1804) arranged between the front baffle (1801) and the rear baffle (1802), when the protruding block cooperates with the switch assembly (20), the end of the reset spring (1804) is in a deformed state, and the reset force is provided for the main shaft (301).

8. An explosion-proof limit switch according to claim 7, characterised in that Both ends of the reset assembly (180) are formed with action arms, the front baffle (1801) and the rear baffle (1802) are formed with limiting arms, and the action arms and the limiting arms are limited to each other.

9. The explosion-proof limit switch of claim 1, wherein The main shaft (301) is connected with the switch assembly (20), and the switch assembly (20) is a change-over switch.

10. An explosion-proof limit switch according to claim 9, wherein The main shaft (301) is connected with a cross rod (40).

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