Displacement switch easy to debug

Abstract

The utility model discloses a displacement switch easy to debug, which belongs to the technical field of reed switch displacement sensors and comprises a shell, a reed switch component is adhered in the shell, at least one threaded through hole is arranged on the outer wall of the shell, and a debugging screw is in threaded connection in the threaded through hole. One end of the debugging screw penetrates through the threaded through hole and is connected with the reed switch assembly, and during manufacturing, the position of the reed switch assembly in the shell can be adjusted in real time through the adjusting screw, so that accurate debugging of performance is realized; the problem that according to an existing reed pipe type annunciator, when a reed pipe is solidified in glue liquid, the position of the reed pipe changes relative to the detection face of a sensor, and consequently the working point of the sensor cannot be accurately adjusted is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of reed displacement sensors, in particular to an easily debuggable displacement switch. Background Technique

[0002] A displacement switch, also known as a forming switch or a limit switch, can be installed on a relatively stationary object or a moving object. When the moving object approaches the stationary object, the internal contacts of the switch are disconnected or closed, so as to realize the displacement control or position indication of the moving part. With the development of modern industry, displacement switches are more and more widely used in the industrial field, mainly used to convert mechanical displacement into electrical signals, so as to effectively change the operating state of the motor and achieve the control of mechanical actions or program control. The limit switch is combined with other equipment to form a more complex and scientific automation equipment, which has important value for the development of industry. A reed has a simpler structure, smaller volume, higher speed and longer working life than a general mechanical switch; compared with an electronic switch, it also has the characteristics of strong anti-load impact ability and high working reliability.

[0003] At present, the conventional fixing method of the reed is to pour it into a shell with glue, and the reed is fixed after the glue solidifies. In order to ensure the firmness of the reed fixation, epoxy resin is generally used for pouring. Due to the large thermal expansion coefficient of the glue, after long-term use, the poured glue will deform, resulting in the displacement of the reed position or even cracks, causing the signaler to fail and affecting the reliability of the reed-type signaler. At the same time, when the reed solidifies in the glue, its own position will change relative to the sensor detection surface, resulting in the inability to accurately adjust the working point of the sensor. Content of the Utility Model

[0004] In view of the above deficiencies of the prior art, the easily debuggable displacement switch provided by the utility model solves the problem that the existing reed-type signaler has the problem that when the reed solidifies in the glue, its own position changes relative to the sensor detection surface, resulting in the inability to accurately adjust the working point of the sensor.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] An easily debuggable displacement switch is provided, which includes a housing, a reed assembly is adhesively connected inside the housing, at least one threaded through hole is provided on the outer wall of the housing, a debugging screw is threadedly connected in the threaded through hole, and one end of the debugging screw passes through the threaded through hole and is connected to the reed assembly.

[0007] The basic principle of the easily adjustable displacement switch in the present utility model is as follows: When manufacturing the easily adjustable displacement switch, first, the reed switch assembly is arranged inside the housing, and then the reed switch assembly is fixed by an adhesive. During the solidification process of the adhesive, the position of the reed switch assembly inside the housing can be adjusted by a debugging screw. Before the adhesive is cured, it is ensured that the position of the reed switch assembly after the position adjustment remains unchanged inside the housing. After the adhesive is cured, the reed switch assembly is completely fixed inside the housing. Finally, the debugging screw is removed, and the threaded through-hole is filled and cured with the adhesive to complete the manufacturing of the easily adjustable displacement switch. The reed switch assembly senses the magnetic field strength of the target permanent magnet (magnet steel). When the permanent magnet approaches the product test surface to reach the target distance range, the reed switch assembly switches from normally open to normally closed or from normally closed to normally open, and transmits a pulse signal to the superior system.

[0008] When manufacturing the easily adjustable displacement switch, before the adhesive is cured, the position of the reed switch assembly inside the housing can be adjusted in real time by the debugging screw, realizing precise debugging of the performance, and solving the problem that in the existing reed switch type signaler, the position of the reed switch relative to the sensor detection surface will change during the solidification in the glue liquid, resulting in the inability to precisely adjust the working point of the sensor.

[0009] Furthermore, the reed switch assembly is fixed inside the housing by a first adhesive.

[0010] Furthermore, as a specific setting method of the reed switch assembly, the reed switch assembly includes a bushing arranged inside the housing. The bushing is fixed inside the housing by a first adhesive, and a reed switch is fixed inside the bushing by a second adhesive. Conductors are welded to both ends of the reed switch. The free end of each conductor is located outside the housing. One end of the debugging screw passes through the threaded through-hole and is threadedly connected to the outer wall of the bushing. Specifically, the reed switch is selected to have a single-pole double-throw structure, and the normally open or normally closed structure can be selected according to user requirements. Different specifications and sizes of reed switches can be selected according to the measured displacement distance, the operating temperature range, and the space size.

[0011] Furthermore, the outer wall of each conductor is wrapped with a first heat shrinkable tube, and the first heat shrinkable tube includes the solder joints of the conductor and the reed switch. Using the first heat shrinkable tube can wrap the reed switch pins and solder joints, so that the pins do not contact the bushing and the housing to ensure the insulation performance of the product.

[0012] Furthermore, the free ends of the two conductors include a second heat shrinkable tube. The second heat shrinkable tube can wrap the two conductors into a bundle of conductors, and at the same time, it also plays a role in protecting the conductors.

[0013] Furthermore, the first adhesive is an epoxy resin adhesive. After curing, the epoxy resin adhesive can firmly fix the reed switch assembly in the housing, and its position will not change under high and low temperature environments and vibration environments outside. The epoxy resin adhesive has high adhesiveness, hardness, acid and alkali resistance, ensuring the adaptability of the product in different use environments. The cured adhesive has insulation properties.

[0014] The second adhesive is a silicone rubber adhesive. After curing, the silicone rubber adhesive can fix the reed switch in the bushing. After curing, the silicone rubber adhesive has a certain elasticity, so that the stress on the glass body of the reed switch in high and low temperature environments and vibration environments is small and will not be damaged. The cured silicone rubber adhesive has insulation properties.

[0015] Furthermore, the materials of the first heat shrinkable tube and the second heat shrinkable tube are both high-temperature resistant flexible polyolefin or polytetrafluoroethylene materials. The high-temperature resistant flexible polyolefin or polytetrafluoroethylene materials have characteristics such as softness, corrosion resistance, and insulation, and are suitable for this product.

[0016] Furthermore, the materials of the housing and the bushing are non-magnetic materials. Non-magnetic materials can be selected from materials such as aluminum alloy and plastic. The beneficial effects are as follows: The housing has a certain strength, which can protect the internal structure of the product from being damaged during normal use. It is non-magnetic and will not affect the accuracy of the internal reed switch in sensing the magnetic field. The adaptability of the product in different use environments can be ensured by surface treatment of the outer surface. The bushing has a certain strength, which can protect the reed switch inside the bushing from physical damage or performance changes due to the stress generated by the thermal expansion and contraction of the second adhesive during normal use. It is non-magnetic and will not affect the accuracy of the internal reed switch in sensing the magnetic field.

[0017] Furthermore, the cross-sections of the housing and the bushing are both rectangular structures, and there is a filling gap between the housing and the bushing, and the filling gap is greater than 0.5 mm. The rectangular cross-section of the housing makes the main body of the entire easy-to-adjust displacement switch a rectangular columnar structure, so as to ensure the installation and positioning of the displacement switch in the upper-level system and facilitate the opening of threaded through holes. The rectangular cross-section of the bushing makes the entire reed switch assembly a rectangular columnar structure, which is convenient for the fixation and adjustment of the reed switch assembly in the housing.

[0018] The beneficial effects of the present utility model are as follows:

[0019] 1. For an easy-to-adjust displacement switch provided by this solution, during production, the position of the reed switch assembly in the housing can be adjusted in real time by adjusting the screw, realizing precise debugging of performance, and solving the problem that in the existing reed switch signal device, when the reed switch solidifies in the glue, its own position will change relative to the sensor detection surface, resulting in the inability to precisely adjust the working point of the sensor.

[0020] 2. An easily debuggable displacement switch provided by this solution adopts a double-layer potting structure. Silicone rubber is used for potting inside, reducing the damage to the vitreous body of the reed switch caused by the thermal expansion and contraction of the colloid; epoxy resin is used for potting outside, ensuring the overall strength and environmental adaptability of the displacement switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view structural schematic diagram of an easily debuggable displacement switch.

[0022] Figure 2 It is a side view structural schematic diagram of an easily debuggable displacement switch.

[0023] Figure 3 It is a structural schematic diagram of the reed switch assembly.

[0024] Among them, 1. Housing; 2. Reed switch assembly; 201. Bushing; 202. Reed switch; 203. Wire; 204. Pin; 3. Threaded through hole; 4. Debugging screw; 5. First adhesive; 6. Second adhesive; 7. First heat shrinkable tube; 8. Second heat shrinkable tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following describes the specific embodiments of the present invention so that those skilled in the art of this technology can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the present invention are within the scope of protection.

[0026] As Figures 1 to 3 shown, the present invention provides an easily debuggable displacement switch, which includes a housing 1. A reed switch assembly 2 is adhesively bonded inside the housing 1. At least one threaded through hole 3 is provided on the outer wall of the housing 1. A debugging screw 4 is threadedly connected inside the threaded through hole 3. One end of the debugging screw 4 passes through the threaded through hole 3 and is connected to the reed switch assembly 2. When manufacturing the easily debuggable displacement switch, first, the reed switch assembly 2 is arranged inside the housing 1, and then the reed switch assembly 2 is fixed through an adhesive. During the solidification process of the adhesive, the position of the reed switch assembly 2 inside the housing 1 can be adjusted through the debugging screw 4. Before the adhesive is cured, it ensures that the position of the reed switch assembly 2 after the position adjustment remains unchanged inside the housing 1. After the adhesive is cured, the reed switch assembly 2 is completely fixed inside the housing 1. Finally, the adjustment screw is removed, and the threaded through hole 3 is filled and cured with an adhesive to complete the manufacture of the easily debuggable displacement switch. The reed switch assembly 2 senses the magnetic field magnitude of the target permanent magnet (magnet). When the permanent magnet approaches the product test surface to reach the target distance range, the reed switch assembly 2 switches from normally open to normally closed or from normally closed to normally open, and transmits a pulse signal to the upper-level system.

[0027] When the easy-to-adjust displacement switch is manufactured, when the adhesive is not cured, the position of the reed switch assembly 2 in the housing 1 can be adjusted in real time by adjusting the screw, realizing precise debugging of the performance, and solving the problem that in the existing reed switch 202 type signaler, when the reed switch 202 solidifies in the glue, its own position will change relative to the sensor detection surface, resulting in the inability to precisely adjust the working point of the sensor.

[0028] Specifically, the reed switch assembly 2 is fixed in the housing 1 by the first adhesive 5. The first adhesive 5 is an epoxy resin-based adhesive. After the epoxy resin-based adhesive is cured, it can firmly fix the reed switch assembly 2 in the housing 1, and its position will not change under external high and low temperature environments and vibration environments; the epoxy resin-based adhesive has high adhesiveness, hardness, and acid and alkali resistance, ensuring the adaptability of the product in different use environments; the cured adhesive has insulation properties.

[0029] Specifically, as Figure 3 shown, as a specific setting method of the reed switch assembly 2, the reed switch assembly 2 includes a bushing 201 arranged in the housing 1. The bushing 201 is fixed in the housing 1 by the first adhesive 5. A reed switch 202 is fixed in the bushing 201 by a second adhesive 6. The second adhesive 6 is a silicone rubber-based adhesive. After the silicone rubber-based adhesive is cured, it can fix the reed switch 202 in the bushing 201; the silicone rubber-based adhesive has a certain elasticity after curing, so that the stress on the glass body of the reed switch 202 in high and low temperature environments and vibration environments is small and will not be damaged; the cured silicone rubber-based adhesive has insulation properties.

[0030] Leads 203 are welded to both ends of the reed switch 202, and the free end of each lead 203 is located outside the housing 1; one end of the debugging screw 4 passes through the threaded through hole 3 and is threadedly connected to the outer wall of the bushing 201. Specifically, the reed switch 202 is selected to have a single-pole double-throw structure, and a normally open or normally closed structure can be selected according to user needs. Different specifications and sizes of reed switches 202 can be selected according to the measured displacement distance, operating temperature range, and space size.

[0031] A first heat shrinkable tube 7 is wrapped around the outer wall of each lead 203. The first heat shrinkable tube 7 includes the solder joints of the lead 203 and the reed switch 202. Using the first heat shrinkable tube 7 can wrap the pins 204 and solder joints of the reed switch 202, so that the pins 204 do not contact the bushing 201 and the housing 1 to ensure the insulation performance of the product.

[0032] The free ends of the two wires 203 include a second heat shrinkable tube 8. The second heat shrinkable tube 8 can wrap the two wires 203 into a bundle of wires 203, and at the same time plays a role in protecting the wires 203. The materials of the first heat shrinkable tube 7 and the second heat shrinkable tube 8 are both high-temperature resistant flexible polyolefin or polytetrafluoroethylene materials. The high-temperature resistant flexible polyolefin or polytetrafluoroethylene materials have the characteristics of softness, corrosion resistance, insulation, etc., and are suitable for this product.

[0033] Preferably but not limited to, the materials of the outer shell 1 and the bushing 201 are non-magnetic materials. Non-magnetic materials can be selected from materials such as aluminum alloy and plastic. The outer shell 1 has a certain strength, which can protect the internal structure of the product from being damaged during normal use, is non-magnetic, and will not affect the accuracy of the internal reed switch 202 in sensing the magnetic field; the adaptability of the product in different use environments can be ensured by performing surface treatment on the outer surface. The bushing 201 has a certain strength to protect the internal reed switch 202 in the bushing 201 from physical damage or performance change due to the stress generated by the thermal expansion and contraction of the second adhesive 6 during normal use, is non-magnetic, and will not affect the accuracy of the internal reed switch 202 in sensing the magnetic field.

[0034] The cross-sections of the outer shell 1 and the bushing 201 are both rectangular structures, and there is a filling gap between the outer shell 1 and the bushing 201, and the filling gap is greater than 0.5 mm. The cross-section of the outer shell 1 is a rectangular structure, making the main body of the entire easy-to-adjust displacement switch a rectangular columnar structure to ensure the installation and positioning of the displacement switch in the upper-level system and facilitate the opening of the threaded through hole 3; the cross-section of the bushing 201 is a rectangular structure, making the entire reed switch assembly 2 a rectangular columnar structure, which is convenient for the fixation and adjustment of the reed switch assembly 2 in the outer shell 1.

Claims

1. An easily debuggable displacement switch, characterized in that, It includes a housing, a reed switch assembly is bonded inside the housing, at least one threaded through hole is provided on the outer wall of the housing, a debugging screw is threadedly connected in the threaded through hole, and one end of the debugging screw passes through the threaded through hole and is connected to the reed switch assembly.

2. The easy-to-debug displacement switch according to claim 1, wherein The reed switch assembly is fixed inside the housing by a first adhesive.

3. The easily debuggable displacement switch according to claim 2, characterized in that, The reed switch assembly includes a bushing disposed inside the housing, the bushing is fixed inside the housing by the first adhesive, a reed switch is fixed inside the bushing by a second adhesive, leads are welded to both ends of the reed switch, and the free end of each lead is located outside the housing; one end of the debugging screw passes through the threaded through hole and is threadedly connected to the outer wall of the bushing.

4. The easily debuggable displacement switch according to claim 3, wherein, A first heat shrinkable tube is wrapped around the outer wall of each lead, and the first heat shrinkable tube includes the solder joint of the lead and the reed switch.

5. The easily debuggable displacement switch according to claim 4, wherein The free ends of the two leads include a second heat shrinkable tube.

6. The easily debuggable displacement switch according to claim 5, wherein The first adhesive is an epoxy resin-based adhesive, and the second adhesive is a silicone rubber-based adhesive.

7. The easily debuggable displacement switch according to claim 6, characterized in that, The materials of the first heat shrinkable tube and the second heat shrinkable tube are both high-temperature resistant flexible polyolefin or polytetrafluoroethylene materials.

8. The easy-to-debug displacement switch according to claim 7, characterized in that, The materials of the housing and the bushing are non-magnetic materials.

9. The easy-to-debug displacement switch according to claim 8, characterized in that, The cross-sections of the housing and the bushing are both rectangular structures, and a filling gap is provided between the housing and the bushing, and the filling gap is greater than 0.5 mm.

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