Mining proximity switch

Abstract

The invention relates to a mining proximity switch, and relates to the field of mining proximity switches, and the mining proximity switch comprises a mining proximity switch with a housing, an induction trigger device is arranged in the housing, an induction socket of the induction trigger device is sleeved with a wire insertion tube, a wire plug is inserted in the wire insertion tube, and a connecting device is arranged in the wire insertion tube to improve the butt joint stability of the two. The connecting device comprises a plug which is detachably connected with the wire plug and is provided with a clamping groove, a U-shaped locking plate which penetrates through the wire inserting pipe and extends into the clamping groove, an installation ring which is connected with the plug through a reset spring, a first bimetallic strip, a second bimetallic strip, a clamping block, a spherical block and the like, and permanent magnets are arranged on the inner wall of the inserting pipe and the wire plug. The wire plug is also sleeved with a protective cover in threaded connection with the plugging pipe. The mining proximity switch achieves the technical effects that the butt joint stability of the wire plug and the induction socket is enhanced, and normal use of the mining proximity switch is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mining proximity switches, in particular to a mining proximity switch. BACKGROUND

[0002] The mining proximity switch plays a key role in the field of mining production, which is mainly used to detect the proximity state of objects, and can convert mechanical displacement signals into electrical signals to realize automatic control. With the continuous improvement of the automation level of mining industry, the performance and stability of the mining proximity switch are increasingly demanding. Precise and reliable proximity switches can effectively improve the safety and efficiency of mining production, reduce manual operation errors, and reduce the risk of accidents, playing a crucial role in the safety production and efficient operation of mining industry. Today, the scale of mining production is expanding, and the mining environment is becoming more complex, which poses higher challenges to the reliability and adaptability of proximity switches.

[0003] In related technologies, to realize the connection of the wire plug of the mining proximity switch and the induction socket, there are several common methods. One is to use a simple plug-in connection, which directly inserts the wire plug into the induction socket and relies on physical contact to realize circuit conduction. Two is to use threaded connection, set corresponding threaded structures on the plug and socket, and tighten by rotating to ensure the stability of the connection. In addition, there is also a buckle connection method, which uses elastic buckles to fix the plug on the socket. These methods can meet the basic connection needs to some extent, but each has its own characteristics under different working conditions.

[0004] However, these existing connection methods have obvious defects. The simple plug-in connection has poor stability, and in the complex environment of the mine, the plug is easy to loosen or even fall off due to vibration, collision and other factors, thereby affecting the normal work of the proximity switch. Although the threaded connection is relatively stable, the installation and disassembly process is relatively cumbersome, which is not conducive to the maintenance and replacement of the equipment. The reliability of the buckle connection is limited, and the buckle is easy to wear out after a long time of use, losing the fixing function, which also causes the problem of unstable connection. SUMMARY

[0005] In order to improve the connection stability, the present application provides a mining proximity switch.

[0006] A mining proximity switch, comprising a shell; An induction trigger device is arranged in the shell, and the induction trigger device is provided with an induction socket; The induction socket is provided with a wire insertion pipe, and a wire plug is inserted in the wire insertion pipe and connected with the induction socket; A connection device is arranged in the wire insertion pipe to improve the stability of the wire plug and the induction socket after connection; The connection device comprises: The plug is detachably connected with the wire plug, the plug is inserted into the wire inserting tube, and a clamping groove is formed on the surface of the plug. The U-shaped locking piece penetrates through the wire inserting tube and extends into the clamping groove.

[0007] By adopting the above technical scheme, the shell is arranged to protect the internal elements, the induction trigger device cooperates with the induction socket to realize the induction function, the wire inserting tube is sleeved outside the induction socket to accommodate the wire plug, the wire plug is butted with the induction socket to transmit signals, the plug is detachably connected with the wire plug and is inserted into the wire inserting tube, and the clamping groove cooperates with the U-shaped locking piece penetrating through the wire inserting tube, so that the stability of the butt joint of the wire plug and the induction socket is improved, and normal use of the mine proximity switch is ensured.

[0008] Optionally, the connecting device further comprises a mounting ring sleeved outside the induction socket, the mounting ring is connected with the inner wall of the plug through a reset spring, and a limiting ring is connected to the mounting ring and is inserted into the wire plug.

[0009] By adopting the above technical scheme, before the wire plug is inserted into the plug and butted with the induction socket, the limiting ring extends into the limiting groove of the wire plug to ensure correct butt joint of the two, and when the wire plug is further inserted, the reset spring is deformed and contracted, so that the stability of the butt joint of the wire plug and the induction socket is improved, and normal use of the mine proximity switch is ensured.

[0010] Optionally, a U-shaped first bimetallic piece is arranged on the mounting ring and penetrates through the plug; one end of the first bimetallic piece between the plug-in tube and the plug is deformed and clamped with the locking piece; and the other end of the first bimetallic piece in the plug is deformed and clamped with the wire plug.

[0011] By adopting the above technical scheme, the U-shaped first bimetallic piece on the mounting ring penetrates through the plug, one end of the first bimetallic piece between the plug-in tube and the plug is deformed and clamped with the locking piece, and the other end of the first bimetallic piece in the plug is deformed and clamped with the wire plug, so that the stability of the butt joint of the wire plug and the induction socket is improved, and normal use of the mine proximity switch is ensured.

[0012] Optionally, a U-shaped second bimetallic piece is arranged on the mounting ring and penetrates through the plug; one end of the second bimetallic piece between the plug-in tube and the plug is deformed and clamped with the inner wall of the plug-in tube; the other end of the second bimetallic piece in the plug is deformed and clamped with the wire plug, and an arc-shaped clamping plate is connected to the end of the second bimetallic piece, and the clamping plate abuts against the surface of the wire plug.

[0013] By adopting the above technical scheme, the U-shaped second bimetallic piece on the mounting ring penetrates through the plug, the second bimetallic piece is deformed, one end of the second bimetallic piece between the plug-in tube and the plug is clamped with the inner wall of the plug-in tube, the other end of the second bimetallic piece in the plug is clamped with the wire plug, and the end of the second bimetallic piece is provided with an arc-shaped clamping plate abutting against the surface of the wire plug, so that the stability of the butt joint of the wire plug and the induction socket is improved, and normal use of the mine proximity switch is ensured.

[0014] Optionally, the end of the clamping plate is connected with a clamping piece with S-shaped cross section, and the side wall of the plug is provided with a positioning groove; after installation, the clamping piece near the arc surface of the second bimetallic piece penetrates the positioning groove and abuts against the inner wall of the plug-in pipe, and the arc surface of the clamping piece away from the second bimetallic piece abuts against the wire plug.

[0015] By adopting the above technical scheme, the S-shaped clamping piece connected to the end of the clamping plate abuts against the inner wall of the plug-in pipe through the positioning groove near the arc surface of the second bimetallic piece after installation, and the arc surface of the clamping piece away from the second bimetallic piece abuts against the wire plug, thereby enhancing the stability of the wire plug and the induction socket in butt joint, and ensuring the normal use of the mine proximity switch.

[0016] Optionally, the first and second bimetallic pieces are provided with clamping blocks at one end between the plug-in pipe and the plug; the locking piece is provided with a first plug-in groove, and the clamping block on the first bimetallic piece extends into the first plug-in groove; the plug-in pipe is provided with a second plug-in groove, and the clamping block on the second bimetallic piece extends into the second plug-in groove; the first and second bimetallic pieces are provided with spherical blocks at one end in the plug; and the wire plug is provided with a mounting groove, and the spherical blocks extend into the mounting groove.

[0017] By adopting the above technical scheme, the clamping blocks at one end of the first and second bimetallic pieces between the plug-in pipe and the plug extend into the first plug-in groove of the locking piece and the second plug-in groove of the plug-in pipe respectively, and the spherical blocks at one end in the plug extend into the mounting groove of the wire plug, which can further enhance the stability of the wire plug and the induction socket in butt joint, and ensure the normal use of the mine proximity switch.

[0018] Optionally, the inner wall of the plug-in pipe is provided with a first permanent magnet, and the first permanent magnet is magnetically connected with the clamping piece.

[0019] By adopting the above technical scheme, the first permanent magnet magnetically connected with the clamping piece is arranged on the inner wall of the plug-in pipe, which can make the arc convex surface of the clamping piece away from the clamping plate abut against the wire plug when the second bimetallic piece is not deformed, and further increase the stability of the wire plug.

[0020] Optionally, a second permanent magnet is slidably connected to the wire plug, and after installation, the second permanent magnet and the first permanent magnet attract each other, and the second permanent magnet abuts against the clamping piece.

[0021] By adopting the above technical scheme, the second permanent magnet and the first permanent magnet attract each other, which can push the clamping piece to move and make the clamping piece abut against the wire plug, thereby enhancing the stability of the wire plug and the induction socket in butt joint, and ensuring the normal use of the mine proximity switch.

[0022] Optionally, a protective cover is sleeved on the wire plug, and the protective cover is threadedly connected with the plug-in pipe.

[0023] By adopting the technical scheme, the protective cover is threadedly connected with the plug-in pipe, so that dust from the outside can be prevented from entering the plug-in pipe and the plug, and the magnetism of the first permanent magnet and the second permanent magnet can be prevented from being reduced.

[0024] Optionally, the first and second bimetallic strips have a deformation temperature matching a normal working temperature of the wire in the mine.

[0025] By adopting the technical scheme, the first and second bimetallic strips can be deformed at the normal working temperature of the wire in the mine, so that the stability of the connection between the wire plug and the induction socket is enhanced, and the normal use of the mine proximity switch is ensured.

[0026] In summary, the present application has at least one of the following beneficial technical effects: 1. The connecting device can improve the stability of the wire plug after being connected with the induction socket, avoid loosening or falling off of the plug due to vibration, collision and other factors in the complex environment of the mine, and ensure normal working of the mine proximity switch; 2. The first and second bimetallic strips have a deformation temperature matching a normal working temperature of the wire in the mine, so that the first and second bimetallic strips can be clamped with the locking piece, the inner wall of the plug-in pipe and the wire plug at the normal working temperature of the wire, and the stability of the connection is further improved; 3. The protective cover sleeved on the wire plug is threadedly connected with the plug-in pipe, so that dust from the outside can be prevented from entering the plug-in pipe and the plug, and the magnetism of the first permanent magnet and the second permanent magnet can be prevented from being reduced, and the stability of the connection is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is an explosion structure schematic diagram of the present application; Figure 2 is a sectional structure schematic diagram of the present application, mainly embodying the first bimetallic strip; Figure 3 is Figure 2 is an enlarged schematic diagram of the structure at position A in FIG. 4; Figure 4 is a sectional structure schematic diagram of the present application, mainly embodying the second bimetallic strip; Figure 5 is Figure 4 is an enlarged schematic diagram of the structure at position B in FIG. 5.

[0028] Figure Descriptions: 1. Outer shell; 2. Fixing plate; 3. Induction triggering device; 4. Induction socket; 5. Conduit; 6. Wire plug; 7. Fixing groove; 8. Plug; 9. Locking plate; 10. Positioning ring; 11. Snap-fit ​​groove; 12. Snap-fit ​​hole; 13. Spring groove; 14. Return spring; 15. Mounting ring; 16. Limiting ring; 17. Limiting groove; 18. Sliding plate; 19. Sliding groove; 20. First bimetallic strip; 21. First spring; 22. Second spring; 23. First 24. Second clearance slot; 25. First snap-fit ​​block; 26. First insertion slot; 27. First spherical block; 28. Mounting slot; 29. ​​Second bimetallic strip; 30. Third spring; 31. Fourth spring; 32. Third clearance slot; 33. Fourth clearance slot; 34. Second snap-fit ​​block; 35. Second insertion slot; 36. Second spherical block; 37. Snap-fit ​​plate; 38. Protective cover; 39. Snap-fit ​​piece; 40. Positioning slot; 41. First permanent magnet; 42. Second permanent magnet. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0030] A mining proximity switch, reference Figure 1 , Figure 2 The device includes a disc-shaped explosion-proof alloy shell 1. A fixing plate 2 is fixedly connected to one side surface of the shell 1. The fixing plate 2 has through holes for screws. A sensor triggering device 3 is fixedly connected inside the shell 1. The sensor triggering device 3 is connected to a sensor socket 4 that penetrates the arc-shaped side wall of the shell 1. A wiring conduit 5 is fixedly connected to the arc-shaped side wall surface of the shell 1. The wiring conduit 5 is sleeved outside the sensor socket 4, and a fixing groove 7 is opened inside the wiring conduit 5. The sensor socket 4 extends into the fixing groove 7. A wire plug 6 for connecting to external wires is inserted into the wiring conduit 5. The end of the wire plug 6 inside the wiring conduit 5 mates with the sensor socket 4. In addition, a connecting device is provided inside the wiring conduit 5 to improve the stability after the wire plug 6 mates with the sensor socket 4.

[0031] The connecting device includes a plug 8 and a U-shaped locking piece 9. The plug 8 is inserted into the wiring tube 5, and a positioning ring 10 is fixedly connected to the outer surface of the plug 8. After the plug 8 is installed in place, the positioning ring 10 abuts against the inner wall of the wiring tube 5. At the same time, the plug 8 extends into the fixing groove 7, and the terminal of the induction socket 4 extends into the plug 8. Two snap-fit ​​grooves 11 are formed on the outer surface of the plug 8, and two snap-fit ​​holes 12 are formed on the wiring tube 5 corresponding to the positions of the snap-fit ​​grooves 11. The two ends of the locking piece 9 pass through the corresponding snap-fit ​​holes 12 and snap-fit ​​grooves 11, respectively. The locking piece 9 abuts against the inner walls of the snap-fit ​​holes 12 and snap-fit ​​grooves 11, thereby initially locking the plug 8 in the wiring tube 5.

[0032] ReferenceFigure 2 , Figure 3 The positioning ring 10 is hollow, and its internal space is connected to the internal space of the plug 8. A spring groove 13 is formed on the inner wall of the positioning ring 10 near the sensor socket 4. Multiple return springs 14 are fixedly connected within the spring groove 13. An installation ring 15 is fixedly connected to the end of each return spring 14 away from the sensor socket 4. Meanwhile, a limiting ring 16 is fixedly connected to the side of the installation ring 15 opposite to the return spring 14, and a limiting groove 17 is formed on the wire plug 6. When the wire plug 6 is inserted into the plug 8 and before it aligns with the sensor socket 4, the limiting ring 16 of the plug 8 extends into the limiting groove 17, thus ensuring proper alignment between the wire plug 6 and the sensor socket 4. When the wire plug 6 is further inserted, the return spring 14 deforms and contracts, and the limiting ring 16 extends into the spring groove 13 when the plug is in place.

[0033] Reference Figure 1 , Figure 3 The outer surface of the mounting ring 15 is fixedly connected with four equally spaced sliding plates 18. At the same time, the side wall of the plug 8 is provided with four sliding grooves 19 corresponding to the positions of the sliding plates 18. The sliding plates 18 extend into the sliding grooves 19 and slide along the sliding grooves 19.

[0034] Two opposing sliding plates 18 on the mounting ring 15 have a first bimetallic strip 20 fixedly connected to the surface of the plate away from the induction socket 4. The cross-section of the first bimetallic strip 20 is U-shaped, and its thermal deformation temperature matches the normal operating temperature of the wire in the mine. A first spring 21 and a second spring 22 are fixedly connected to the two ends of the first bimetallic strip 20, respectively. A first clearance groove 23 is formed on the outer surface of the plug 8, and the first clearance groove 23 communicates with the snap-fit ​​groove 11. A second clearance groove 24 is formed on the inner wall of the plug 8, and the second clearance groove 24 corresponds to the position of the first clearance groove 23.

[0035] Reference Figure 1 , Figure 2 , Figure 3 The first spring piece 21 extends into the first recess 23, and the end of the first spring piece 21 is fixedly connected to the first snap-fit ​​block 25. At the same time, the locking piece 9 has a first insertion slot 26 on the side near the plug 8. When the wire plug 6 is installed in place and the mounting ring 15 is located in the spring groove 13, the first snap-fit ​​block 25 is aligned with the first insertion slot 26. When the first bimetallic strip 20 deforms, it can drive the first snap-fit ​​block 25 on the first spring piece 21 to insert into the first insertion slot 26.

[0036] The second elastic sheet 22 extends into the second accommodating groove 24, and the end of the second elastic sheet 22 is fixedly connected with a first spherical block 27, and meanwhile, the outer surface of the wire plug 6 is provided with four installation grooves 28 corresponding to the sliding plates 18. When the wire plug 6 is inserted into the plug 8, the outer wall of the wire plug 6 abuts against the first spherical block 27, and the first spherical block 27 slides towards the groove bottom of the second accommodating groove 24; when the installation groove 28 of the wire plug 6 is aligned with the first spherical block 27, the first spherical block 27 extends into the installation groove 28; when the first bimetallic sheet 20 deforms, the first spherical block 27 on the second elastic sheet 22 can be driven to abut against the installation groove 28.

[0037] With reference to Figure 3 、 Figure 4 、 Figure 5 The other two opposite sliding plates 18 on the mounting ring 15 are fixedly connected with second bimetallic sheets 29 away from the induction socket 4, and the parameters and sizes of the second bimetallic sheets 29 are the same as those of the first bimetallic sheet 20, and meanwhile, the two ends of the second bimetallic sheets 29 are fixedly connected with third elastic sheets 30 and fourth elastic sheets 31 respectively. The outer surface of the plug 8 is provided with a third accommodating groove 32, and the inner wall of the plug 8 is provided with a fourth accommodating groove 33 corresponding to the position of the third accommodating groove 32.

[0038] The third elastic sheet 30 extends into the third accommodating groove 32, and the end of the third elastic sheet 30 is fixedly connected with a second clamping block 34, and meanwhile, the inner wall of the wire tube 5 is provided with two second insertion grooves 35 corresponding to the position of the third accommodating groove 32. When the wire plug 6 is installed in place and the mounting ring 15 is located in the spring groove 13, the second clamping block 34 is aligned with the second insertion groove 35. When the second bimetallic sheet 29 deforms, the second clamping block 34 on the third elastic sheet 30 can be driven to extend into the second insertion groove 35.

[0039] The fourth elastic sheet 31 extends into the fourth accommodating groove 33, and the end of the fourth elastic sheet 31 is fixedly connected with a second spherical block 36. When the wire plug 6 is inserted into the plug 8, the outer wall of the wire plug 6 abuts against the second spherical block 36, and the second spherical block 36 slides towards the groove bottom of the fourth accommodating groove 33; when the installation groove 28 of the wire plug 6 is aligned with the second spherical block 36, the second spherical block 36 extends into the installation groove 28; when the second bimetallic sheet 29 deforms, the second spherical block 36 on the fourth elastic sheet 31 can be driven to abut against the installation groove 28.

[0040] The end of the fourth elastic sheet 31 away from the second bimetallic sheet 29 is fixedly connected with an arc-shaped clamping plate 37, and the arc-shaped surface of the clamping plate 37 protrudes towards the axis of the plug 8. When the wire plug 6 is inserted into the plug 8, the arc-shaped protruding surface of the clamping plate 37 abuts against the surface of the wire plug 6.

[0041] The end of the clamping plate 37 away from the fourth spring sheet 31 is fixedly connected with a clamping sheet 39, the cross section of the clamping sheet 39 is S-shaped, wherein the arc convex surface of the clamping sheet 39 close to the clamping plate 37 protrudes towards the side wall of the plug 8, and the other arc convex surface of the clamping sheet 39 protrudes away from the side wall of the plug 8, and meanwhile, the plug 8 is provided with a positioning groove 40. When the wire plug 6 is inserted into the plug 8, the wire plug 6 pushes the clamping sheet 39 and makes it extend into the fourth accommodating groove 33; when the wire plug 6 is installed in place and the installation ring 15 is located in the spring groove 13, the arc convex surface of the clamping sheet 39 close to the clamping plate 37 extends into the positioning groove 40; when the second bimetallic sheet 29 is deformed, the clamping plate 37 can drive the clamping sheet 39 to abut against the plug 8, so that the clamping sheet 39 is elastically deformed, the arc convex surface of the clamping sheet 39 close to the clamping plate 37 abuts against the inner wall of the wire plug 6, and meanwhile, the other arc convex surface of the clamping sheet 39 abuts against the wire plug 6, and at this time, the end of the clamping sheet 39 away from the clamping plate 37 abuts against the plug 8.

[0042] The inner wall of the plug-in pipe is slidably connected with a first permanent magnet 41 at the positioning groove 40, and meanwhile, the wire plug 6 is slidably connected with a second permanent magnet 42, the surfaces of the first permanent magnet 41 and the second permanent magnet 42 are coated with a protective layer, so as to increase the service life of the first permanent magnet 41 and the second permanent magnet 42. When the wire plug 6 is installed in place and the installation ring 15 is located in the spring groove 13, the first permanent magnet 41 and the second permanent magnet 42 are magnetically attracted, so that the second permanent magnet 42 pushes the clamping sheet 39 to slide towards the first permanent magnet 41, so that when the second bimetallic sheet 29 is not deformed, the arc convex surface of the clamping sheet 39 away from the clamping plate 37 abuts against the wire plug 6, and the stability of the wire plug 6 is increased. In addition, the wire plug 6 is sleeved with a protective cover 38, and the protective cover 38 is threadedly connected with the outer wall of the plug-in pipe, so as to avoid the dust outside from entering the plug-in pipe and the plug 8, and reduce the magnetism of the first permanent magnet 41 and the second permanent magnet 42.

[0043] The implementation principle of the embodiment of the application is that when the wire plug 6 is inserted, the preliminary orientation positioning is first realized through the cooperation of the limiting ring 16 and the limiting groove 17 of the wire plug 6, so as to ensure accurate butt joint with the induction socket 4; when continuously inserted, the reset spring 14 is compressed to provide a continuous pushing force, so that the wire plug 6 is in close contact with the induction socket 4. At the same time, the U-shaped locking sheet 9 and the clamping groove 11 of the plug 8 form a first level of locking, so as to prevent the plug 8 from being pulled out.

[0044] When the temperature of the mine environment reaches the normal working temperature of the wire (such as 50-80℃), the first and second bimetallic sheets 29 are deformed by heat.

[0045] The first bimetallic sheet 20: the outer end drives the clamping block to be inserted into the first insertion groove 26 of the locking sheet 9, and the inner end pushes the spherical block to be clamped into the wire plug 6 installation groove 28.

[0046] The second bimetallic sheet 29 is inserted into the second insertion slot 35 on the inner wall of the plug wire pipe 5, and the inner end is locked by the arc-shaped clamping plate 37 and the S-shaped clamping sheet 39 to lock the wire plug 6 in two directions (one end of the clamping sheet 39 abuts against the inner wall of the plug wire pipe 5, and the other end abuts against the surface of the wire plug 6). It triggers deformation by using the inherent environmental temperature of the mine, without additional energy, and self-adapts to enhance the connection strength.

[0047] At the same time, the first permanent magnet 41 (on the inner wall of the plug wire pipe 5) and the second permanent magnet 42 (on the wire plug 6) attract each other after being installed in place, push the second permanent magnet 42 to abut against the S-shaped clamping sheet 39, so that the S-shaped clamping sheet 39 is tightly attached to the surface of the wire plug 6, and provides instant locking force. The clamping sheet 39 is magnetically connected with the first permanent magnet 41, and pre-tightens the wire plug 6 when the bimetallic sheet is not deformed, so as to avoid initial looseness. At the same time, the protective cover 38 is threadedly connected with the plug pipe to seal the internal components, prevent the mine dust from entering to cause the magnetic decay of the permanent magnet or the mechanical part to be stuck, and ensure long-term stability.

[0048] In addition, the spherical block cooperates with the curved surface of the installation slot 28 to disperse the vibration stress received by the wire plug 6. The elastic deformation of the S-shaped clamping sheet 39 can absorb the lateral impact of the wire plug 6. At the same time, the continuous compression of the reset spring 14 can compensate for the gap caused by the interface wear of the wire plug 6.

[0049] When the wire plug 6 is inserted, the limiting ring 16 is guided and positioned to ensure accurate butt joint, and the reset spring 14 provides continuous compression force; the U-shaped locking sheet 9 and the plug 8 form a basic locking with the clamping slot 11.

[0050] When the temperature of the mine rises to the working temperature of the wire, the first and second bimetallic sheets 29 are deformed synchronously: the outer end is locked into the insertion slot of the locking sheet 9 and the inner wall of the plug pipe respectively, the inner end drives the spherical block to be clamped into the installation slot 28 of the wire plug 6, and the S-shaped clamping sheet 39 abuts against the inner wall of the plug pipe and the surface of the wire plug 6 in two directions, realizing temperature self-adaptive reinforced locking.

[0051] In addition, the first permanent magnet 41 on the inner wall of the plug pipe attracts the second permanent magnet 42 on the wire plug 6, and pushes the clamping sheet 39 to pre-tighten the wire plug 6; the protective cover 38 is threadedly sealed to prevent dust, and long-term stability is ensured. Thus, a three-level stable mechanism of mechanical guidance, temperature control locking and magnetic force assistance is formed, and the plug loosening problem caused by mine vibration is completely solved.

[0052] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A proximity switch for mining applications, characterized in that: Includes the outer casing (1); The outer casing (1) is provided with a sensor triggering device (3), and the sensor triggering device (3) is provided with a sensor socket (4); The induction socket (4) is covered with a plug tube (5), and a wire plug (6) that connects to the induction socket (4) is inserted inside the plug tube; The connector is equipped with a connection device to improve the stability of the wire plug (6) after it is connected to the induction socket (4); The connecting device includes: The plug (8) is detachably connected to the wire plug (6). The plug (8) is inserted into the wire tube (5). The surface of the plug (8) is provided with a snap-fit ​​groove (11). The U-shaped locking piece (9) passes through the insertion tube (5) and extends into the snap-fit ​​groove (11).

2. A mining proximity switch according to claim 1, characterized in that: The connecting device also includes a mounting ring (15) sleeved outside the induction socket (4). The mounting ring (15) is connected to the inner wall of the plug (8) through a return spring (14). A limiting ring (16) is connected to the mounting ring (15). The limiting ring (16) is inserted into the wire plug (6).

3. A mining proximity switch according to claim 2, characterized in that: The mounting ring (15) is provided with a U-shaped first bimetallic strip (20), which passes through the plug (8); After the first bimetallic strip (20) deforms at one end between the insertion tube and the plug (8), it engages with the locking piece (9); After one end of the first bimetallic strip (20) is deformed inside the plug (8), it snaps into the wire plug (6).

4. A mining proximity switch according to claim 2, characterized in that: The mounting ring (15) is provided with a U-shaped second bimetallic strip (29), which passes through the plug (8); The second bimetallic strip (29) deforms at one end between the insertion tube and the plug (8) and then engages with the inner wall of the insertion tube; After one end of the second bimetallic strip (29) is deformed inside the plug (8), it is snapped into the wire plug (6), and the end is connected to an arc-shaped snap-fit ​​plate (37), which abuts against the surface of the wire plug (6).

5. A mining proximity switch according to claim 4, characterized in that: The end of the snap-fit ​​plate (37) is connected to a snap-fit ​​piece (39) with an S-shaped cross-section, and the side wall of the plug (8) is provided with a positioning groove (40); After installation, the snap-fit ​​piece (39) passes through the positioning groove (40) near the arc-shaped surface of the second bimetallic strip (29) and abuts against the inner wall of the connector tube. The snap-fit ​​piece (39) away from the arc-shaped surface of the second bimetallic strip (29) abuts against the wire plug (6).

6. A mining proximity switch according to any one of claims 3-5, characterized in that: Both the first and second bimetallic strips (29) have a snap-fit ​​block at one end between the insertion tube and the plug (8); The locking plate (9) has a first insertion slot (26), and the snap-fit ​​block on the first bimetallic plate (20) extends into the first insertion slot (26); The insertion tube is provided with a second insertion slot (35), and the snap-fit ​​block on the second bimetallic strip (29) extends into the second insertion slot (35); Both the first and second bimetallic strips (29) have a spherical block at one end inside the plug (8); The wire plug (6) has an installation groove (28) and the spherical block extends into the installation groove (28).

7. A mining proximity switch according to claim 6, characterized in that: The inner wall of the insertion tube is provided with a first permanent magnet (41), which is magnetically connected to the snap-fit ​​piece (39).

8. A mining proximity switch according to claim 7, characterized in that: The wire plug (6) is slidably connected to a second permanent magnet (42). After installation, the second permanent magnet (42) and the first permanent magnet (41) attract each other, and the second permanent magnet (42) abuts against the snap-fit ​​piece (39).

9. A mining proximity switch according to claim 8, characterized in that: The wire plug (6) is fitted with a protective cover (38), which is threadedly connected to the plug tube.

10. A mining proximity switch according to claim 6, characterized in that: The first and second bimetallic strips (29) are heated to a temperature that matches the temperature of the conductors when they are working normally in the mine.

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