Travel switch

Abstract

The utility model relates to a travel switch, which comprises a bottom box and a sealing cover, the bottom box comprises a switch box and a junction box, the sealing cover comprises a cover plate corresponding to the switch box and an extension plate corresponding to the junction box, the middle parts of the switch box and the cover plate are fixedly provided with first bearings, and the interior of the switch box is fixedly connected with two conductive plates. The two current-conducting plates are arranged on the periphery of the first bearing in a circumferential array mode, terminals are fixedly connected into the junction box, a wire groove is formed in one side of the junction box, and the switch box and the cover plate are rotationally connected with a first insulation column through the first bearing. The utility model has the advantages that the rotation of the driving rod does not need to be driven by a spring or a torsion spring, the problem that the driving rod cannot be reset in time due to metal fatigue is avoided, the service life is prolonged, and the spring or the torsion spring does not need to be mounted during production, so that the assembly is convenient. During grain rotation, door closing illumination can be achieved through an electronic element connected with the travel switch in parallel, the state of the travel switch can be switched to achieve door closing illumination, and redundant guarantee is provided for door closing illumination.

Description

Technical Field

[0001] The utility model relates to the technical field of travel switches, in particular to a travel switch. Background Art

[0002] The interior of the warehouse used for storing grain needs to be equipped with lighting equipment to meet the lighting needs. Granary managers need to manage the lighting equipment in the granary. Specifically, during the daily storage stage in the warehouse, the lighting equipment needs to be turned on when in use and turned off when leaving the warehouse; during the rotation period, the lighting needs to be turned on after the grain inspection door is closed to meet the needs of operations in the warehouse. However, the problem of managers forgetting to turn off the lights when leaving the warehouse often occurs in the prior art, which cannot meet the requirements of granary management specifications. It can be considered to add a travel switch to the power supply circuit for powering the lighting equipment, so that the contacts of the travel switch are triggered by the grain inspection door, thereby achieving the purpose of powering on when the door is opened and powering off when the door is closed.

[0003] The travel switch is a type of position switch (also called limit switch), and is a commonly used low-current main control electrical appliance. It uses the collision of the limit block to make its contacts move to connect or disconnect the control circuit to achieve a certain control purpose. However, when the existing travel switch is used in a granary, it has the following defects:

[0004] First, the driving rod extending from the existing travel switch is generally controlled by a spring or a torsion spring. Each time the grain inspection door is opened and closed, the performance of the spring and the torsion spring will be affected. Long-term use of the spring and the torsion spring will cause metal fatigue, resulting in poor flexibility of the driving rod, affecting normal use. Second, in order to meet the demand for turning on the lighting after the grain inspection door is closed during rotation, a part of electrical circuits and electrical components are generally added to the lighting circuit. The travel switch itself does not have the corresponding function. When the added electrical component fails, there is no redundant structure to ensure the lighting needs during rotation. Utility Model Content

[0005] The purpose of the utility model is to solve at least one of the technical defects described in the background technology.

[0006] Therefore, one purpose of the utility model is to provide a travel switch, aiming to solve the problems of the spring or torsion spring of the travel switch in the prior art being affected by metal fatigue and inconvenient to assemble after long-term use.

[0007] In order to achieve the above-mentioned purpose, an embodiment of the utility model on one hand provides a travel switch, including a bottom box and a cover fixedly installed on the top of the bottom box, the bottom box includes a switch box and a junction box, the cover includes a cover plate corresponding to the switch box, and an extension plate corresponding to the junction box, characterized in that a first bearing is fixedly installed in the middle of the switch box and the cover plate, two conductive plates are fixedly connected inside the switch box, and the two conductive plates are arranged in a circular array around the first bearing, a terminal is fixedly connected inside the junction box, a wire groove is provided on one side of the junction box, the switch box and the cover plate are rotatably connected to a first insulating column through the first bearing, a conductive ring is fixedly connected to the outer surface of the first insulating column, and two power connection plates are fixedly connected to the outer surface of the conductive ring;

[0008] One end of the first insulating column passes through one end of the cover plate and is fixedly installed with a positioning block, a side of the positioning block away from the first insulating column is fixedly installed with a driving rod, one end of the driving rod is fixedly connected to a pressure rod, and the end of the pressure rod away from the driving rod is fixedly connected to a counterweight block.

[0009] Preferably, any of the above schemes is that a limit plate is fixedly connected to the inside of the switch box, and the limit plate is located above the first bearing, so as to avoid the problem that the first insulating column rotates too quickly due to closing the door too quickly, causing the counterweight block to rotate to the left side of the first insulating column and affecting subsequent use.

[0010] Preferably, any of the above schemes has a sliding groove on the front of the positioning block, the driving rod is slidably connected to the inside of the sliding groove, a second threaded hole is provided inside the sliding groove, and a long groove is provided on one side of the driving rod to adjust the extended length of the driving rod, thereby facilitating the fixation of the base box.

[0011] Preferably, any of the above schemes is that a second bearing is fixedly installed inside the extension plate, and the extension plate is rotatably connected to the second insulating column through the second bearing, one end of the second insulating column is fixedly connected to a power connection column, and two power connection blocks are fixedly connected to the outer surface of the power connection column, and two L-shaped conductive plates are fixedly connected to positions corresponding to the power connection blocks inside the junction box, and a knob is fixedly connected to the end of the second insulating column away from the power connection column. When the door is closed, the switch can be turned on by rotating the knob to power on the room, thereby providing an emergency function.

[0012] Preferably, any of the above schemes has a plurality of latch teeth fixedly connected to the outer surface of the second insulating column, a spring sheet fixedly connected to the inner wall of the junction box, one end of the spring sheet being engaged with the latch teeth, thereby limiting the position of the second insulating column and preventing it from rotating due to vibration.

[0013] Preferably, any of the above schemes is that the bottom box, cover, positioning block, drive rod, pressure rod and counterweight block are all made of polytetrafluoroethylene. Polytetrafluoroethylene is insulating and can be used in granaries to prevent corrosion by phosphine.

[0014] Compared with the prior art, the advantages and beneficial effects of the utility model are:

[0015] 1. The rotation of the driving rod does not require a spring or torsion spring to drive it, and there is no problem of the driving rod not being able to reset in time due to metal fatigue, which extends the service life. In addition, during production, there is no need to install a spring or torsion spring, which facilitates assembly.

[0016] 2. By setting a limit plate, it is possible to avoid the problem that the door is closed too quickly, causing the counterweight block to be unusable after rotating to the left side of the first insulating column. The structure is simple and reliable, and the practicality is improved.

[0017] 3. During grain rotation, the second insulating column can be rotated by the knob so that the light in the granary can be turned on when the grain inspection door is closed. It has an emergency function and adds redundancy to the power supply circuit.

[0018] 4. The spring sheet is clamped inside two adjacent teeth, so that when the second insulating column is rotated, the spring sheet can play a certain damping role, thereby avoiding the problem of the second insulating column rotating due to vibration, causing the indoor light to turn on or off.

[0019] 5. The bottom box, cover, positioning block, drive rod, pressure rod and counterweight block are all made of polytetrafluoroethylene. Therefore, when used in a granary, when fumigation and insecticide are carried out in the granary to produce phosphine, they can resist phosphine corrosion very well, thus extending the service life of the switch.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structure according to the utility model;

[0023] Figure 2 It is a schematic diagram of the exploded structure according to the utility model;

[0024] Figure 3 It is a structural schematic diagram of the bottom box according to the utility model;

[0025] Figure 4It is a structural schematic diagram of the sealing cover according to the utility model;

[0026] Figure 5 It is a schematic structural diagram of the first insulating column according to the utility model;

[0027] Figure 6 It is a structural schematic diagram of the back side of the positioning block according to the utility model;

[0028] Figure 7 It is a structural schematic diagram of the second insulating column according to the utility model;

[0029] Figure 8 This is a structural diagram of the power supply circuit in the granary.

[0030] Wherein: 1. bottom box, 11. switch box, 111. conductive plate, 112. limit plate, 12. junction box, 121. L-shaped conductive plate, 122. spring sheet, 13. terminal, 131. wire groove, 14. threaded tube, 15. fixing plate, 2. cover, 21. cover plate, 22. extension plate, 23. hole groove, 3. first insulating column, 31. conductive ring, 32. power board, 33. connecting groove, 34. first threaded hole, 4. positioning block, 41. connecting block, 42. through hole, 43. slide groove, 44. second threaded hole, 5. driving rod, 51. pressure rod, 52. counterweight block, 53. long groove, 54. roller, 6. second insulating column, 61. power column, 62. power block, 63. knob, 64. tooth, 7. first bearing, 71. second bearing. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The utility model provides a travel switch.

[0034] Embodiment 1:

[0035] like Figure 1-5 As shown, it includes a bottom box 1 and a cover 2 fixedly installed on the top of the bottom box 1, the bottom box 1 includes a switch box 11 and a junction box 12, the cover 2 includes a cover plate 21 corresponding to the switch box 11, and an extension plate 22 corresponding to the junction box 12, characterized in that the middle of the switch box 11 and the cover plate 21 are fixedly installed with a first bearing 7, the inside of the switch box 11 is fixedly connected with two conductive plates 111, and the two conductive plates 111 are arranged in a circumferential array around the first bearing 7, the inside of the junction box 12 is fixedly connected with a terminal 13, two terminals 13 are provided, and the two conductive plates 11 are respectively connected to the two terminals 13 through cables A wire groove 131 is provided on one side of the junction box 12, and the live wire and the control wire can pass through the wire groove 131 to the inside of the junction box 12 and be connected to the two terminals 13 respectively, so that the two conductive plates 111 can be powered. The switch box 11 and the cover plate 21 are rotatably connected to the first insulating column 3 through the first bearing 7, and the outer surface of the first insulating column 3 is fixedly connected to a conductive ring 31, and the outer surface of the conductive ring 31 is fixedly connected to two power connection plates 32. By rotating the first insulating column 3, the two power connection plates 32 are respectively in contact with the two conductive plates 111, so that the live wire and the control wire in the two terminals 13 are connected, so as to achieve the purpose of power supply;

[0036] like Figure 1-2 As shown, one end of the first insulating column 3 passes through one end of the cover plate 21 and is fixedly installed with a positioning block 4, and a driving rod 5 is fixedly installed on the side of the positioning block 4 away from the first insulating column 3, and one end of the driving rod 5 is fixedly connected to a pressure rod 51, and an end of the pressure rod 51 away from the driving rod 5 is fixedly connected to a counterweight block 52, and the total weight of the counterweight block 52 and the pressure rod 51 is greater than the weight of the driving rod 5. Force is applied to the driving rod 5 to make the driving rod 5 in a vertical state. After the driving rod 5 is released, the counterweight block 52 can press down the top end of the driving rod 5 through the pressure rod 51, so that the driving rod 5 rotates clockwise by a certain angle.

[0037] Specifically, Figure 5-6 As shown, a connecting groove 33 is provided on one end face of the first insulating column 3 that passes through the cover plate 21, and a connecting block 41 is fixedly connected to the back of the positioning block 4. The connecting block 41 and the connecting groove 33 are both polygonal columns. The connecting block 41 is inserted into the inside of the connecting groove 33, so that the positioning block 4 can drive the first insulating column 3 to rotate through the connecting block 41. A first threaded hole 34 is provided inside the connecting groove 33, and a through hole 42 is provided on one side of the connecting block 41 at a position corresponding to the first threaded hole 34, and the through hole 42 passes through the positioning block 4, and a bolt is used to pass through the through hole 42 and threadedly connected to the first threaded hole 34, so that the positioning block 4 can be fixedly installed on one end of the first insulating column 3.

[0038] Specifically, Figure 1-2As shown, a slide groove 43 is provided on the front side of the positioning block 4, and the driving rod 5 is slidably connected to the inside of the slide groove 43. By sliding the driving rod 5, the extended length of the driving rod 5 can be adjusted. Therefore, when installing the travel switch, the position to be installed can be roughly determined, and then the extended length of the driving rod 5 can be adjusted to ensure that the driving rod 5 can be squeezed when closing the door, so as to achieve the purpose of facilitating installation. A second threaded hole 44 is provided inside the slide groove 43, and a long groove 53 is provided on one side of the driving rod 5. A bolt is used to penetrate the long groove 53 and threadedly connect it to the second threaded hole 44, and after tightening the bolt, the driving rod 5 can be fixedly installed on the positioning block 4.

[0039] Preferably, one end of the driving rod 5 away from the pressure rod 51 is rotatably connected to a roller 54. When the door squeezes the driving rod 5, the roller 54 rolls and rubs against the door, which can reduce wear and reduce noise caused by friction.

[0040] Specifically, the inner wall of the base box 1 is fixedly connected with a threaded tube 14, and a hole groove 23 is opened at a position corresponding to the threaded tube 14 on one side of the cover 2. Bolts are used to penetrate the hole groove 23 and are threadedly connected to the inside of the threaded tube 14, so that the cover 2 can be fixedly installed on the top of the base box 1. The outer wall of the base box 1 is fixedly connected with a fixing plate 15, and holes are punched in the door frame. Then, expansion bolts are used to penetrate the fixing plate 15 and fix it to the holes in the door frame, so that the base box 1 can be fixed in the door frame.

[0041] Embodiment 2:

[0042] like Figure 2-3 As shown, when the door is closed too quickly, the driving rod 5 rotates faster, and the counterweight 52 will rotate to the left side of the first insulating column 3 due to inertia, which will make the travel switch unusable. To solve this problem, on the basis of embodiment one, the switch box 11 is fixedly connected to the inside of the limit plate 112, and the limit plate 112 is located above the first bearing 7. When the first insulating column 3 rotates a certain angle, the power board 32 will conflict with the limit plate 112, so that the first insulating column 3 will not continue to rotate, thereby avoiding the problem of the counterweight 52 rotating to the left side of the first insulating column 3 due to closing the door too quickly.

[0043] Embodiment three:

[0044] like Figure 1-7As shown, on the basis of embodiment one or embodiment two, a second bearing 71 is fixedly installed inside the extension plate 22, and the extension plate 22 is rotatably connected to the second insulating column 6 through the second bearing 71. One end of the second insulating column 6 is fixedly connected to a power connection column 61, and the outer surface of the power connection column 61 is fixedly connected to two power connection blocks 62, and the two power connection blocks 62 are respectively connected to the two terminals through cables. Two L-shaped conductive plates 121 are fixedly connected to the positions corresponding to the power connection blocks 62 inside the junction box 22, and a knob 63 is fixedly connected to the end of the second insulating column 6 away from the power connection column 61. The second insulating column 6 is rotated by rotating the knob 63, so that the two power connection blocks 62 are respectively rotated into the two L-shaped conductive plates 121. After the L-shaped conductive plates 121 are in contact with the power connection blocks 62, the live wires and the control wires in the two terminals 13 can be connected to achieve power-on.

[0045] Preferably, the outer surface of the second insulating column 6 is fixedly connected with a plurality of latch teeth 64, and the inner wall of the junction box 12 is fixedly connected with a spring sheet 122, one end of the spring sheet 122 is engaged with the latch teeth 64, when the second insulating column 6 is rotated, the latch teeth 64 will move the spring sheet 122 to cause deformation, and when the second insulating column 6 stops rotating, one end of the spring sheet 122 is inserted between two adjacent latch teeth 64, thereby playing a certain damping role, avoiding the problem of the second insulating column 6 rotating due to vibration, causing the indoor lights to turn on or off.

[0046] Embodiment 4:

[0047] On the basis of the first embodiment or the second embodiment or the third embodiment, the bottom box 1, the sealing cover 2, the positioning block 4, the driving rod 5, the pressure rod 51 and the counterweight block 52 are all made of polytetrafluoroethylene. When the travel switch is installed in the granary, phosphine is produced during fumigation and insecticide treatment in the granary. Phosphine is corrosive, and polytetrafluoroethylene can resist the corrosion of phosphine. Polytetrafluoroethylene also has good insulation properties. Therefore, the travel switch can be used in the granary.

[0048] The working principle of the utility model is as follows: when used in a granary, the travel switch is installed in the door frame of the granary using expansion bolts, and then the live wire and control wire of the internal lamp in the granary are connected to the terminal 13, and the extension length of the driving rod 5 is adjusted by sliding, so that the driving rod 5 can be pushed during the closing process of the granary door, and then the driving rod 5 can be fixed. When the door is opened, the driving rod 5 loses its supporting force, and the counterweight block 52 can press the driving rod 5 down through the pressure rod 51, so that the first insulating column 3 rotates, and the two power connection plates 32 contact the two conductive plates 111, and the light in the granary can be powered on and turned on. When the door is closed, the door pushes the driving rod 5, so that the first insulating column 3 rotates, the power connection plate 32 is separated from the conductive plate 111, and the light is powered off and extinguished;

[0049] During grain rotation, the second insulating column 6 can be rotated by the knob 63 to make the power block 62 contact with the L-shaped conductive plate 121, so that the light in the granary can be turned on, which can be used as an emergency to avoid the problem of darkness in the granary after closing the door.

[0050] The travel switch of the utility model is as follows Figure 8 The method shown is connected to the power supply circuit of the lighting system in the granary. In the figure, SQ is the travel switch disclosed in this application; KZ is the leakage protector, whose model is ZP25A; S1 is the self-locking button; KM is a two-pole DC contactor; L1, L2, and L3 are parallel lighting equipment. The working principle of the power supply circuit is introduced as follows:

[0051] Under normal conditions, the travel switch SQ is in the normally open state, the coil of KM loses power, the KM contacts are disconnected, and the lighting devices L1, L2, and L3 are powered off and extinguished; after the granary door is opened, the travel switch SQ is closed, the coil of KM is energized, the KM contacts are closed, and the lighting devices L1, L2, and L3 are energized and lit. Among them, S1 is in the disconnected state under normal conditions. When the door needs to be closed for lighting (such as during grain rotation), pressing S1 can energize the KM coil, close the KM contacts, and energize the lighting devices L1, L2, and L3. When S1 fails, the second insulating column 6 can be rotated to keep the travel switch SQ in the closed state, which can ensure that the lighting devices L1, L2, and L3 are energized and lit after the door is closed.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. When the door is opened, the counterweight block 52 presses down the driving rod 5 through the pressure rod 51 to open the switch. Therefore, the rotation of the driving rod 5 does not require a spring or a torsion spring to drive it, and there is no problem that the driving rod 5 cannot be reset in time due to metal fatigue, which extends the service life. In addition, during production, there is no need to install a spring or a torsion spring, which facilitates assembly.

[0054] 2. By setting the limit plate 112, after the first insulating column 3 rotates to a certain angle, it can be restricted by the limit plate 112 and cannot continue to rotate. Therefore, it can avoid the problem of closing the door too quickly, causing the counterweight block 52 to be unusable after rotating to the left side of the first insulating column 3. The structure is simple and reliable, and the practicality is improved.

[0055] 3. During grain rotation, the second insulating column 6 can be rotated by the knob 63 to make the power block 62 contact with the L-shaped conductive plate 121, so that the light in the granary can be turned on, which can be used as an emergency to avoid the problem of darkness in the granary after closing the door.

[0056] 4. By providing a latch tooth 62 on the outer surface of the second insulating column 6 and providing a spring sheet 122 on the inner wall of the junction box 12, the spring sheet 122 is engaged with the inside of two adjacent latch teeth 62, so that when the second insulating column 6 is rotated, the spring sheet 122 can play a certain damping role, thereby avoiding the problem of the second insulating column 6 rotating due to vibration, causing the indoor light to turn on or off.

[0057] 5. The bottom box 1, the cover 2, the positioning block 4, the driving rod 5, the pressure rod 51 and the counterweight block 52 are all made of polytetrafluoroethylene, which has good insulation and resistance to phosphine corrosion. Therefore, when used in a granary, when fumigation and insecticide are carried out in the granary to produce phosphine, it can resist phosphine corrosion very well, thereby extending the service life of the switch.

Claims

1. A travel switch, comprising a bottom box (1) and a cover (2) fixedly mounted on the top of the bottom box (1), wherein the bottom box (1) comprises a switch box (11) and a junction box (12), wherein the cover (2) comprises a cover plate (21) corresponding to the switch box (11) and an extension plate (22) corresponding to the junction box (12), characterized in that: A first bearing (7) is fixedly mounted in the middle of the switch box (11) and the cover plate (21); two conductive plates (111) are fixedly connected inside the switch box (11), and the two conductive plates (111) are arranged in a circumferential array around the first bearing (7); a terminal (13) is fixedly connected inside the junction box (12); a wire groove (131) is provided on one side of the junction box (12); the switch box (11) and the cover plate (21) are rotatably connected to a first insulating column (3) via the first bearing (7); a conductive ring (31) is fixedly connected to the outer surface of the first insulating column (3), and two power connection plates (32) are fixedly connected to the outer surface of the conductive ring (31); One end of the first insulating column (3) passes through the cover plate (21) and is fixedly mounted with a positioning block (4); a side of the positioning block (4) away from the first insulating column (3) is fixedly mounted with a driving rod (5); one end of the driving rod (5) is fixedly connected to a pressure rod (51); and an end of the pressure rod (51) away from the driving rod (5) is fixedly connected to a counterweight block (52).

2. The travel switch according to claim 1, characterized in that: A limit plate (112) is fixedly connected to the interior of the switch box (11), and the limit plate (112) is located above the first bearing (7).

3. The travel switch according to claim 1, characterized in that: The first insulating column (3) passes through the cover plate (21) and is provided with a connection groove (33) on one end surface; the back of the positioning block (4) is fixedly connected with a connection block (41); the connection block (41) is inserted into the interior of the connection groove (33); a first threaded hole (34) is provided in the interior of the connection groove (33); a through hole (42) is provided on one side of the connection block (41) at a position corresponding to the first threaded hole (34); and the through hole (42) passes through the positioning block (4).

4. The travel switch according to claim 3, characterized in that: A sliding groove (43) is provided on the front of the positioning block (4), the driving rod (5) is slidably connected inside the sliding groove (43), a second threaded hole (44) is provided inside the sliding groove (43), and a long groove (53) is provided on one side of the driving rod (5).

5. The travel switch according to claim 1, characterized in that: One end of the driving rod (5) away from the pressing rod (51) is rotatably connected to a roller (54).

6. The travel switch according to claim 1, characterized in that: A second bearing (71) is fixedly installed inside the extension plate (22), and the extension plate (22) is rotatably connected to the second insulating column (6) via the second bearing (71); one end of the second insulating column (6) is fixedly connected to a power connection column (61); two power connection blocks (62) are fixedly connected to the outer surface of the power connection column (61); two L-shaped conductive plates (121) are fixedly connected to positions corresponding to the power connection blocks (62) inside the junction box (12); and one end of the second insulating column (6) away from the power connection column (61) is fixedly connected to a knob (63).

7. The travel switch according to claim 6, characterized in that: The outer surface of the second insulating column (6) is fixedly connected with a plurality of latch teeth (64), the inner wall of the junction box (12) is fixedly connected with a spring sheet (122), and one end of the spring sheet (122) is latched with the latch teeth (64).

8. The travel switch according to claim 1, characterized in that: The base box (1), the sealing cover (2), the positioning block (4), the driving rod (5), the pressing rod (51) and the counterweight block (52) are all made of polytetrafluoroethylene.

9. The travel switch according to any one of claims 1 to 8, characterized in that: The inner wall of the base box (1) is fixedly connected to a threaded tube (14), a hole groove (23) is provided at a position corresponding to the threaded tube (14) on one side of the sealing cover (2), and the outer wall of the base box (1) is fixedly connected to a fixing plate (15).

Images