Proximity switch capable of controlling on or off state of certain distance

Abstract

The utility model discloses a proximity switch capable of controlling a certain distance to be in an on or off state, which relates to the technical field of proximity switches and comprises a protective shell, a mounting plate is mounted at the bottom end in the protective shell, a proximity switch body is mounted at the upper end of the mounting plate, and limiting grooves are symmetrically formed in two ends in the protective shell. Connecting assemblies are symmetrically installed in the two ends of the protective shell, a baffle is fixedly connected to the bottom end in the protective shell, a magnet is arranged on the side, away from the proximity switch body, of the baffle, a moving assembly is installed at the end, away from the proximity switch body, of the baffle, a protective cover is installed at the upper end of the protective shell, and a fixing block is fixedly connected to the bottom end of the protective cover. And a fixing assembly is mounted in the fixing block. By the adoption of the structure, special requirements of users can be met, the switch-on state is kept in a certain distance section, the switch-off state is kept in other distance ranges, or the switch-off state is kept in a certain distance section, and the switch-on state is kept in other ranges.

Description

Technical Field

[0001] The utility model belongs to the technical field of proximity switches, and particularly relates to a proximity switch capable of controlling a certain distance to be in an on or off state. Background Art

[0002] A proximity switch is a position switch that can be operated without direct mechanical contact with moving parts. When an object approaches the sensing surface of the switch to the action distance, the switch will operate, thereby driving a DC appliance or providing control instructions to a computer device. The proximity switch has the characteristics of a travel switch and a micro switch, and also has sensing performance, and has reliable operation, stable performance, fast frequency response, long application life, strong anti-interference ability, and is waterproof, shockproof, and corrosion-resistant. There are two types of proximity switches. One is a normally closed structure, which is in a conducting state below a certain distance with the magnet, and the proximity switch is in a disconnected state above a certain distance. The other structure is a normally open structure, and the signal is provided in reverse, that is, the proximity switch is in a disconnected state below a certain distance, and the switch is in a conducting state above this distance. Proximity switches are widely used in various fields, such as aerospace and industrial production to detect the distance between objects to avoid collisions, automatic induction doors, garage doors, air conditioning equipment in daily life, and security and anti-theft aspects such as data archives, finance, and other industries.

[0003] Publication number "CN219875708U" is a proximity switch, including a mounting portion, a sensor assembly, a connecting assembly and an anti-collision portion, the mounting portion including a cylindrical body and a mounting seat, the mounting seat being detachably connected to one end of the cylindrical body; the sensor assembly including a sensor receptacle and a sensor element, the sensor element being fixed inside the sensor receptacle and extending out of one end of the sensor receptacle to form a detection end; the connecting assembly including an elastic member, the sensor receptacle being elastically connected to the mounting seat through the elastic member so as to move axially along the cylindrical body relative to the cylindrical body; the anti-collision portion including a protective cover, the protective cover being connected to the sensor receptacle and covering the outside of the detection end. Through the above technical scheme, the proximity switch provided by the present disclosure can avoid hard friction or collision with the object to be detected, extend the service life of the proximity switch, and improve production efficiency.

[0004] Although the above-mentioned utility model proximity switch can avoid hard friction or collision with the object to be detected, extend the service life of the proximity switch and improve production efficiency, it has certain limitations. Within the entire working distance range, from far to near, the proximity switch can only be switched from on-off (normally closed) or off-on (normally open). If the proximity switch is required to be in the off state only in a certain distance segment, it cannot be done when it is in the on state above or below this distance segment, which is very inconvenient. Utility Model Content

[0005] In view of the problems mentioned in the background technology, the purpose of the utility model is to provide a proximity switch that can control a certain distance to be in an on or off state, so as to solve the problem that it can only be in an on-off state or an off-on state. If the proximity switch is required to be in an off state only in a certain distance segment, and it cannot be in an on state above or below this distance segment.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A proximity switch capable of controlling a certain distance to be in an on or off state comprises a protective shell, a mounting plate is installed at the bottom end of the protective shell, a proximity switch body is installed at the upper end of the mounting plate, limiting grooves are symmetrically provided at both ends of the protective shell, connecting components are symmetrically installed at both ends of the protective shell, a baffle is fixedly connected to the bottom end of the protective shell, a magnet is provided on the side of the baffle away from the proximity switch body, a moving component is installed at the end of the baffle away from the proximity switch body, a protective cover is installed at the upper end of the protective shell, a fixing block is fixedly connected to the bottom end of the protective cover, and a fixing component is installed inside the fixing block;

[0008] The proximity switch body includes a plastic box, packaging resin, a normally closed reed switch, a normally open reed switch and a wire. The normally closed reed switch and the normally open reed switch are fixedly connected inside the plastic box. The normally closed reed switch and the normally open reed switch are electrically connected. One end of the normally closed reed switch and the normally open reed switch are fixedly connected with a wire. The inside of the plastic box is filled with packaging resin, which can meet the special needs of users. It remains conductive in a certain distance segment and disconnected in other distance ranges, or remains disconnected in a certain distance segment and conductive in other ranges.

[0009] As a preferred technical solution, the moving assembly includes a screw, a guide rod and a drive motor. The end of the baffle away from the proximity switch is rotatably connected to the screw, and the end of the baffle away from the proximity switch is symmetrically fixedly connected to the guide rod. The drive motor is installed at one end of the protective shell, and the output end of the drive motor extends into the interior of the protective shell and is rotatably connected to the screw through a rotating shaft. The outer side of the screw and the guide rod is sleeved with a magnet, the screw and the magnet are threadedly connected, and the guide rod and the magnet are slidingly connected. The position of the magnet can be adjusted according to actual needs, thereby changing the sensing range and triggering conditions of the switch, so that the proximity switch can adapt to different application scenarios and needs.

[0010] As a preferred technical solution, the connecting component includes a first return spring, a moving block, a fixed column, a sliding block and a pushing block. First accommodating cavities are symmetrically opened at both ends of the protective shell. One end of the first accommodating cavity is fixedly connected to the first return spring, and the other end of the first return spring is fixedly connected to the moving block. The end of the moving block away from the first return spring is fixedly connected to the fixed column, and the end of the fixed column away from the moving block extends into the limiting groove. One end of the moving block is fixedly connected to the sliding block, and the end of the sliding block away from the moving block extends toward the side end of the protective shell. The end of the sliding block away from the moving block is fixedly connected to the pushing block. Slide grooves are symmetrically provided at both ends of the protective shell, the slide grooves are connected with the first accommodating cavity, the slide grooves are slidably connected with the slider, a through groove is provided at one end inside the limit groove, the through groove is connected with the first accommodating cavity, the through groove is slidably connected with the fixed column, and the limit blocks are symmetrically fixedly connected at both ends of the mounting plate, the limit blocks are slidably connected with the limit grooves, a through hole is provided at one end of the limit block, a fixed groove is provided at the end of the limit groove away from the through groove, the fixed column passes through the through groove and the through hole and is plugged into the fixed groove, so that users can complete the installation and replacement of the switch more quickly, saving a lot of time and labor costs.

[0011] As an optimal technical scheme, the fixing assembly includes a second return spring, a movable plate, a locking block and an inclined surface, a second accommodating cavity is opened inside the fixed block, one end of the second accommodating cavity is fixedly connected to the second return spring, the other end of the second return spring is fixedly connected to the movable plate, the movable plate is slidably connected to the second accommodating cavity, the end of the movable plate away from the second return spring is fixedly connected to the locking block, the locking block extends out of one end of the fixed block away from the movable plate, the bottom end of the locking block is set as an inclined surface, the protective shell is symmetrically provided with a locking groove, the locking groove and the locking block are snap-connected, the locking groove is slidably connected with a pushing block, the pushing block is extended out of the side end of the protective shell away from the locking groove, the upper chamfer of the protective shell is symmetrically provided with limiting holes, the chamfer of the bottom end of the protective cover is symmetrically fixedly connected with limiting columns, the limiting columns and the limiting holes are plug-in, the bottom end of the protective cover is fixedly connected with a sealing frame, and the sealing frame is plug-in to the inside of the protective shell, which is convenient for users to clean, inspect or maintain the proximity switch, thereby extending the service life of the proximity switch.

[0012] In summary, the utility model mainly has the following beneficial effects:

[0013] First, in the utility model, when the magnet approaches the proximity switch body from a distance, when it reaches about 10mm, the normally open reed switch is closed, the normally closed reed switch is also closed, and the entire circuit is in a closed state. When the magnet continues to approach the proximity switch body, when it reaches about 5mm, the normally open reed switch remains closed, the normally closed reed switch is converted to a disconnected state, and the entire circuit becomes a disconnected state. When the magnet approaches the switch body to a certain extent, it is converted to a distant state. When it is about 6mm away, the normally open reed switch remains closed, the normally open reed switch is converted from a disconnected state to a closed state, and the entire circuit becomes a closed state. The magnet continues to move away from the switch, when it is about 12mm away, the normally open reed switch is converted to a disconnected state, the normally closed reed switch remains closed, and the entire circuit becomes a disconnected state. This can meet the special needs of users, and maintain a conductive state in a certain distance segment, and a disconnected state in other distance ranges, or maintain a disconnected state in a certain distance segment, and a conductive state in other ranges;

[0014] The locking block is then retracted into the second accommodating chamber, and the locking block is then retracted into the second accommodating chamber, and the locking block is then retracted into the second accommodating chamber, and the locking block is then retracted into the second accommodating chamber, and the protective cover is then opened upward, and the pushing block is then pushed upward, and the pushing block is then driven to drive the fixing post to move, and the fixing post is then retracted into the first accommodating chamber, and the fixing post is then retracted into the first accommodating chamber, and the fixing post is then retracted into the fixing slot, and the through hole is then terminated, and the proximity switch body is then taken out of the protective shell upward, and the mounting plate drives the limiting block to be slidably connected in the limiting slot, and when the proximity switch body is taken out of the protective shell, the limiting block is then slidably connected to the limiting slot, and the installation of the proximity switch body can be completed by reverse operation, so that the user can complete the installation and replacement of the switch more quickly, saving a lot of time and labor costs, and facilitating the user to clean, inspect or maintain the proximity switch, and extending the service life of the proximity switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the protective shell of the utility model;

[0017] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the connection component of the utility model;

[0018] Figure 4 It is a cross-sectional three-dimensional structural schematic diagram of the fixing component of the utility model;

[0019] Figure 5 It is a schematic diagram of the series structure of the normally closed reed switch and the normally open reed switch of the utility model;

[0020] Figure 6 The utility model Figure 5 Schematic diagram of circuit connection structure;

[0021] Figure 7 It is a schematic diagram of the parallel structure of the normally closed reed switch and the normally open reed switch of the utility model;

[0022] Figure 8 The utility model Figure 7 Schematic diagram of the circuit connection structure.

[0023] Figure numerals: 1, protective shell, 2, mounting plate, 3, limit block, 4, limit groove, 5, proximity switch body, 51, plastic box, 52, packaging resin, 53, normally closed reed switch, 54, normally open reed switch, 55, wire, 6, magnet, 7, baffle, 8, moving assembly, 81, screw rod, 82, guide rod, 83, driving motor, 9, first accommodating chamber, 10, connecting assembly, 101, first return spring, 102, moving block , 103, fixed column, 104, slider, 105, push block, 11, slide groove, 12, through hole, 14, protective cover, 15, limiting hole, 16, limiting column, 17, sealing frame, 18, fixed block, 19, second accommodating chamber, 20, fixed component, 201, second return spring, 202, movable plate, 203, locking block, 204, inclined surface, 21, locking groove, 22, push block, 23, through groove, 24, fixed groove. DETAILED DESCRIPTION

[0024] refer to Figures 1 to 8 , a proximity switch capable of controlling a certain distance to be in an on or off state as described in this embodiment, comprises a protective shell 1, a mounting plate 2 is installed at the bottom end of the protective shell 1, a proximity switch body 5 is installed at the upper end of the mounting plate 2, limiting grooves 4 are symmetrically provided at both ends of the protective shell 1, connecting components 10 are symmetrically installed at both ends of the protective shell 1, a baffle 7 is fixedly connected to the bottom end of the protective shell 1, a magnet 6 is provided on the side of the baffle 7 away from the proximity switch body 5, a moving component 8 is installed at the end of the baffle 7 away from the proximity switch body 5, a protective cover 14 is installed at the upper end of the protective shell 1, a fixing block 18 is fixedly connected to the bottom end of the protective cover 14, and a fixing component 20 is installed inside the fixing block 18;

[0025] The proximity switch body 5 includes a plastic box 51, a packaging resin 52, a normally closed reed switch 53, a normally open reed switch and a wire 55. The normally closed reed switch 53 and the normally open reed switch 54 are fixedly connected inside the plastic box 51. The normally closed reed switch 53 and the normally open reed switch 54 are electrically connected. One end of the normally closed reed switch 53 and the normally open reed switch 54 are fixedly connected with a wire 55. The plastic box 51 is filled with a packaging resin 52. The normally closed reed switch 53 and the normally open reed switch 54 can be set to be connected in parallel or in series, and the sensitivity of the normally closed reed switch 53 and the normally open reed switch 54 can be adjusted. If the normally closed reed switch 53 and the normally open reed switch 54 are connected in series, when the magnet 6 approaches from a distance When the magnet 6 approaches the switch body 5 and reaches about 10 mm, the normally open reed switch 54 is closed, and the normally closed reed switch 53 is also closed, and the entire circuit is in a closed state. When the magnet 6 continues to approach the switch body 5, when it reaches 5 mm, the normally open reed switch 54 remains closed, and the normally closed reed switch 53 switches to an open state, and the entire circuit becomes an open state. When the magnet 6 approaches the switch body to a certain extent and switches to a distant state, when it is away from the switch body to about 6 mm, the normally open reed switch 54 remains closed, and the normally open reed switch 54 switches from an open state to a closed state, and the entire circuit becomes a closed state. The magnet 6 continues to move away from the switch, and when it is away from 12 mm, the normally open reed switch 54 remains closed, and the normally open reed switch 54 switches from an open state to a closed state. mm, the normally open reed switch 54 is converted to an open state, the normally closed reed switch 53 remains in a closed state, and the entire circuit becomes an open state. When the normally open reed switch 54 and the normally closed reed switch 53 are in parallel, the magnet 6 approaches the proximity switch body 5 from a distance. When it reaches about 10mm, the normally open reed switch 54 is disconnected, and the normally closed reed switch 53 is also in an open state. The entire circuit begins to convert to an open state. Before that, the normally closed reed switch 53 is in a conducting state, and the circuit is in a parallel state, so the circuit is in a conducting state. When the normally open reed switch 54 is in an open state, the entire circuit is in an open state. When the magnet 6 continues to approach the proximity switch body 5, when it reaches When the distance between the magnet 6 and the proximity switch body 5 is about 5mm, the normally open reed switch 54 remains in the disconnected state, the normally closed reed switch 53 switches to the closed state, and the entire circuit becomes closed. When the magnet 6 approaches the proximity switch body 5 to a certain extent and switches to the distant state, when it is away from the proximity switch body 5 to about 6mm, the normally closed reed switch 53 switches to the disconnected state. Because the normally closed reed switch 53 has not yet switched to the closed state, the entire circuit becomes disconnected. The magnet 6 continues to move away from the proximity switch body 5. When it is away from the proximity switch body 5 to about 12mm, the normally closed reed switch 53 switches to the closed state, and the normally open reed switch 54 remains in the disconnected state. Because it is connected in parallel, the entire circuit becomes closed.

[0026] refer to Figure 2The moving assembly 8 includes a screw rod 81, a guide rod 82 and a driving motor 83. The end of the baffle 7 away from the proximity switch is rotatably connected to the screw rod 81, and the end of the baffle 7 away from the proximity switch is symmetrically fixedly connected to the guide rod 82. A driving motor 83 is installed at one end of the protective shell 1. The output end of the driving motor 83 extends into the inside of the protective shell 1 and is rotatably connected to the screw rod 81 through a rotating shaft. The outer sides of the screw rod 81 and the guide rod 82 are sleeved with the magnet 6. The screw rod 81 and the magnet 6 are threadedly connected, and the guide rod 82 and the magnet 6 are slidingly connected. Start the driving motor 83 to control the screw rod 81 to rotate, and the screw rod 81 and the magnet 6 are threadedly rotated, thereby controlling the magnet 6 to move. At the same time, when the magnet 6 moves, it is simultaneously slidably limited on the outer side of the guide rod 82, thereby completing the control of the movement of the magnet 6.

[0027] refer to Figure 3 , the connecting assembly 10 includes a first return spring 101, a moving block 102, a fixed column 103, a slider 104 and a push block 105. The protective shell 1 has first accommodating cavities 9 symmetrically provided at both ends. The first return spring 101 is fixedly connected to one end of the first accommodating cavity 9, and the moving block 102 is fixedly connected to the other end of the first return spring 101. The moving block 102 is fixedly connected to the fixed column 103 at one end away from the first return spring 101. The fixed column 103 extends toward the inside of the limiting groove 4 at one end away from the moving block 102. The slider 104 is fixedly connected to one end of the moving block 102. The end of the slider 104 away from the moving block 102 extends toward the side end of the protective shell 1. The end of the slider 104 away from the moving block 102 is fixedly connected to the push block 105. The protective shell 1 has first accommodating cavities 9 symmetrically provided at both ends. The slider 11 is connected to the first accommodating cavity 9. The slider 11 is slidably connected to the slider 104. A through groove 23 is provided at one end of the limiting groove 4, and the through groove 23 is connected to the first A receiving cavity 9 is connected, the through groove 23 and the fixed column 103 are slidably connected, the limiting blocks 3 are symmetrically fixedly connected at both ends of the mounting plate 2, the limiting blocks 3 are slidably connected with the limiting groove 4, one end of the limiting block 3 is provided with a through hole 12, and the end of the limiting groove 4 away from the through groove 23 is provided with a fixing groove 24, the fixing column 103 passes through the through groove 23 and the through hole 12 and is plugged into the fixing groove 24, after the protective cover 14 is opened by the fixing component 20, the push block 105 is pushed, and the push block 105 drives the fixing column 103 to move, the fixing column 103 retracts into the first receiving cavity 9, the fixing column 103 and the fixing groove 24 are terminated to be plugged, and the penetration of the through hole 12 is terminated at the same time, and then the proximity switch body 5 is taken out from the protective shell 1 upward, and the mounting plate 2 drives the limiting block 3 to be slidably connected inside the limiting groove 4, when the proximity switch body 5 is taken out from the protective shell 1, the limiting block 3 and the limiting groove 4 are terminated to be slidably connected, and the installation of the proximity switch body 5 can be completed by reverse operation.

[0028] refer to Figure 1 , Figure 2 and Figure 4The fixing assembly 20 includes a second return spring 201, a movable plate 202, a locking block 203 and an inclined surface 204. A second accommodating chamber 19 is provided inside the fixing block 18. A second return spring 201 is fixedly connected to one end of the second accommodating chamber 19. The other end of the second return spring 201 is fixedly connected to the movable plate 202. The movable plate 202 is slidably connected to the second accommodating chamber 19. An end of the movable plate 202 away from the second return spring 201 is fixedly connected to the locking block 203. An end of the locking block 203 away from the movable plate 202 extends out of an end of the fixing block 18. The bottom end of the locking block 203 is set as an inclined surface 204. Locking grooves 21 are symmetrically provided inside the protective shell 1. The locking grooves 21 and the locking blocks 203 are snap-connected. A push block 22 is slidably connected to the locking groove 21. The push block 22 is away from the locking groove One end of 21 extends out of the side end of the protective shell 1, and the limiting holes 15 are symmetrically provided at the chamfers of the upper end of the protective shell 1. The limiting columns 16 are symmetrically fixedly connected to the limiting holes 15 at the chamfers of the bottom end of the protective cover 14. The limiting columns 16 are plugged into the limiting holes 15. The bottom end of the protective cover 14 is fixedly connected with a sealing frame 17, and the sealing frame 17 is plugged into the inside of the protective shell 1. Press the pushing block 22, and the pushing block 22 slides inside the locking groove 21. The pushing block 22 pushes the locking block 203, and the locking block 203 drives the moving plate 202 to move. The second reset spring 201 contracts, and at the same time, the locking block 203 retracts into the second accommodating chamber 19, and the locking block 203 ends the engagement with the locking groove 21, and then the protective cover 14 is opened upward, and the limiting columns 16 end the engagement with the limiting holes 15. The installation of the protective cover 14 can be completed by reverse operation.

[0029] Principle and advantages: The normally closed reed switch 53 and the normally open reed switch 54 can be set to be connected in parallel or in series, and the sensitivity of the normally closed reed switch 53 and the normally open reed switch 54 can be adjusted. If the normally closed reed switch 53 and the normally open reed switch 54 are connected in series, when the magnet 6 approaches the proximity switch body 5 from a distance, when it reaches about 10mm, the normally open reed switch 54 is closed, and the normally closed reed switch 53 is also closed, and the whole circuit is in a closed state. When the magnet 6 continues to approach the proximity switch body 5, when it reaches 5mm, the normally open reed switch 54 remains closed, and the normally closed reed switch 53 remains closed. The normally open reed switch 53 is switched to an open state, and the entire circuit becomes an open state. When the magnet 6 approaches the switch body to a certain degree and switches to a distant state, when it is about 6 mm away, the normally open reed switch 54 remains closed, and the normally open reed switch 54 switches from an open state to a closed state, and the entire circuit becomes a closed state. The magnet 6 continues to move away from the switch, and when it is about 12 mm away, the normally open reed switch 54 switches to an open state, and the normally closed reed switch 53 remains closed, and the entire circuit becomes an open state. When the normally open reed switch 54 and the normally closed reed switch When 53 is in parallel, the magnet 6 approaches the proximity switch body 5 from a distance. When it reaches about 10mm, the normally open reed switch 54 is disconnected, and the normally closed reed switch 53 is also in the disconnected state. The entire circuit begins to switch to the disconnected state. Before that, the normally closed reed switch 53 is in the on state, and the circuit is in the parallel state, so the circuit is in the on state. When the normally open reed switch 54 is in the disconnected state, the entire circuit is in the disconnected state. When the magnet 6 continues to approach the proximity switch body 5, when it reaches about 5mm, the normally open reed switch 54 remains in the disconnected state, and the normally closed reed switch 53 switches to The whole circuit will become closed state. When the magnet 6 approaches the proximity switch body 5 to a certain extent and is converted to a distant state, when it is about 6 mm away, the normally closed reed switch 53 is converted to an open state. Because the normally closed reed switch 53 has not yet been converted to a closed state, the whole circuit will become an open state. The magnet 6 continues to move away from the proximity switch body 5. When it is about 12 mm away, the normally closed reed switch 53 is converted to a closed state, and the normally open reed switch 54 remains in an open state. Because they are connected in parallel, the whole circuit becomes closed state.

[0030] The utility model can meet the special needs of users, maintain the conductive state in a certain distance section and the disconnected state in other distance ranges, or maintain the disconnected state in a certain distance section and the conductive state in other ranges, and can allow users to complete the installation and replacement of the switch more quickly, saving a lot of time and labor costs, and at the same time it is convenient for users to clean, inspect or maintain the proximity switch, thereby extending the service life of the proximity switch.

Claims

1. A proximity switch capable of controlling a certain distance to be in an on or off state, comprising a protective shell, characterized in that: A mounting plate is installed at the bottom end of the protective shell, a proximity switch body is installed at the upper end of the mounting plate, limiting grooves are symmetrically provided at both ends of the protective shell, connecting components are symmetrically installed at both ends of the protective shell, a baffle is fixedly connected to the bottom end of the protective shell, a magnet is provided on the side of the baffle away from the proximity switch body, a moving component is installed at the end of the baffle away from the proximity switch body, a protective cover is installed at the upper end of the protective shell, a fixing block is fixedly connected to the bottom end of the protective cover, and a fixing component is installed inside the fixing block; The proximity switch body includes a plastic box, packaging resin, a normally closed reed switch, a normally open reed switch and a wire. The normally closed reed switch and the normally open reed switch are fixedly connected inside the plastic box, and the normally closed reed switch and the normally open reed switch are electrically connected. One end of the normally closed reed switch and the normally open reed switch are fixedly connected with a wire, and the inside of the plastic box is filled with packaging resin.

2. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 1, characterized in that: The moving assembly includes a screw, a guide rod and a drive motor. The end of the baffle away from the proximity switch is rotatably connected to the screw, and the end of the baffle away from the proximity switch is symmetrically fixedly connected to the guide rod. A drive motor is installed at one end of the protective shell, and the output end of the drive motor extends into the interior of the protective shell and is rotatably connected to the screw through a rotating shaft. The outer sides of the screw and the guide rod are sleeved with a magnet, the screw and the magnet are threadedly connected, and the guide rod and the magnet are slidably connected.

3. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 1, characterized in that: The connecting assembly includes a first return spring, a moving block, a fixed column, a slider and a push block, first accommodating cavities are symmetrically opened inside the two ends of the protective shell, one end of the first accommodating cavity is fixedly connected to the first return spring, the other end of the first return spring is fixedly connected to the moving block, the end of the moving block away from the first return spring is fixedly connected to the fixed column, the end of the fixed column away from the moving block extends into the limiting groove, one end of the moving block is fixedly connected to the slider, the end of the slider away from the moving block extends toward the side end of the protective shell, and the end of the slider away from the moving block is fixedly connected to the push block.

4. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 3, characterized in that: The protective shell has symmetrically disposed sliding grooves at both ends, the sliding grooves are connected to the first accommodating cavity, the sliding grooves are slidably connected to the slider, a through groove is disposed at one end inside the limiting groove, the through grooves are connected to the first accommodating cavity, and the through grooves are slidably connected to the fixing column.

5. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 4, characterized in that: The two ends of the mounting plate are symmetrically fixedly connected with limiting blocks, the limiting blocks are slidably connected to the limiting grooves, and a through hole is formed at one end of the limiting block.

6. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 5, characterized in that: A fixing groove is provided at one end of the limiting groove away from the through groove, and the fixing column passes through the through groove and the through hole to be plugged into the fixing groove.

7. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 1, characterized in that: The upper chamfers of the protective shell are symmetrically provided with limiting holes, the chamfers of the bottom end of the protective cover are symmetrically fixedly connected with limiting columns, the limiting columns are plugged into the limiting holes, the bottom end of the protective cover is fixedly connected with a sealing frame, and the sealing frame is plugged into the inside of the protective shell.

8. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 1, characterized in that: The fixing assembly includes a second return spring, a movable plate, a locking block and an inclined surface, a second accommodating cavity is opened inside the fixing block, one end of the second accommodating cavity is fixedly connected to the second return spring, the other end of the second return spring is fixedly connected to the movable plate, the movable plate and the second accommodating cavity are slidably connected, the end of the movable plate away from the second return spring is fixedly connected to the locking block, the end of the locking block away from the movable plate extends out of one end of the fixing block, and the bottom end of the locking block is set as an inclined surface.

9. A proximity switch capable of controlling a certain distance to be in an on or off state according to claim 1, characterized in that: The protective shell is symmetrically provided with locking grooves, the locking grooves are snap-connected with the locking blocks, a pushing block is slidably connected inside the locking grooves, and one end of the pushing block away from the locking grooves extends out of the side end of the protective shell.

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