CN214378221U - Limit switch's induction system and induction type limit switch - Google Patents
Limit switch's induction system and induction type limit switch Download PDFInfo
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- CN214378221U CN214378221U CN202120203261.9U CN202120203261U CN214378221U CN 214378221 U CN214378221 U CN 214378221U CN 202120203261 U CN202120203261 U CN 202120203261U CN 214378221 U CN214378221 U CN 214378221U
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Abstract
The utility model provides a limit switch's induction system and induction type limit switch, including shell, circuit board, tongue tube and cable, still including installing the interior support seat at the shell inner wall, the tongue tube is installed on the circuit board, the circuit board is fixed on the inner support seat, the one end of shell is sealed, other end opening, the cable with the circuit board is connected to draw forth from the open end of shell, the encapsulating is sealed between the open end of cable and shell, will inner support seat, circuit board and tongue tube are sealed in the shell. In the utility model, the reed switch is arranged on the circuit board, and the circuit board is supported by the inner support seat fixed in the shell, thereby improving the stability of the installation of each part; in addition, the cable exit is sealed through the encapsulating, makes inside device and external environment keep apart, has avoided inside device and welding point to appear oxidation corrosion and drop in exposing for a long time in the air, leads to the problem of switching signal interrupt.
Description
Technical Field
The utility model belongs to the technical field of the valve, concretely relates to limit switch's induction system and induction type limit switch.
Background
Limit switches are widely used in various industries. In general, such switches are used to limit the position or stroke of mechanical movement, and in an electrical control system, the limit switches are used to implement sequence control, positioning control and position state detection for controlling the stroke and limit protection of mechanical equipment.
The operating principle of the inductive valve limit switch is that the switch is controlled to be closed by utilizing magnetic field force, when a magnetic target enters the inductive range of the switch, the switch can make corresponding reaction to the magnetic target, and meanwhile, a switching value signal is transmitted to the outside through a signal cable. The induction limit switch device generally comprises an induction device and a trigger device, wherein the trigger device mainly comprises a permanent magnet and generates a magnetic field; the induction device mainly comprises a dry reed switch, and the dry reed switch is sealed in a glass tube by two dry reed sheets. The dry reed acts as a flux conductor. When the magnetic field is generated by the permanent magnet or the electromagnetic coil, the reeds can generate different polarities, and when the magnetic force exceeds the elastic force of the reeds, the two reeds attract and conduct a circuit; when the magnetic field is weakened or disappears, the dry reed is released due to the elasticity of the dry reed, and the contact surfaces are separated, so that the circuit is opened.
In the prior art, the reed switch is mounted in two ways, one is fixed in the shell through glue filling or directly molded integrally through injection, and the other is clamped on the inner wall of the shell together with the circuit board; for the glue pouring or injection molding fixing mode, on one hand, the sealant or the injection molding material has different thermal expansion coefficients, the outer tube of the reed switch is a glass tube, the glass tube is easily extruded and damaged by the sealant or the injection molding material under different temperature environments, on the other hand, the injection molding mechanical strength is low, and the reed switch is easy to bend under the impact of certain external force, so that the reed switch is exposed or falls off finally, and the normal work of the switch is influenced. To the mode of circuit board card at shells inner wall, support not stable enough on the one hand, set up the sealing washer chucking between on the other hand circuit board and the casing, after the sealing washer is ageing, can produce not hard up, influence the switch and normally work.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned deficiencies of the prior art, it is an object of the present invention to provide a limit switch sensing device that ensures the stability and reliability of the installation of internal components.
In order to achieve the above objects and other related objects, the technical solution of the present invention is as follows:
the utility model provides a limit switch's induction system, includes shell, circuit board, tongue tube and cable, still including installing the interior support seat at the shell inner wall, the tongue tube is installed on the circuit board, the circuit board is fixed on the support seat including, the one end of shell is sealed, other end opening, the cable with the circuit board is connected to draw forth from the open end of shell, it is sealed that the encapsulating between the open end of cable and shell will interior support seat, circuit board and tongue tube are sealed in the shell.
Optionally, the inner support seat comprises a connecting portion and a supporting portion, the connecting portion is connected with the inner wall of the housing, the circuit board is mounted on the supporting portion, the supporting portion is close to the closed end, and the connecting portion is close to the open end.
Optionally, the inner wall of the housing is provided with a step, the connecting portion is fixed on the step through a first screw, and the connecting portion is provided with a through hole for a cable to pass through.
Optionally, a groove is formed in the supporting portion, the circuit board is fixed to the supporting portion through a second screw, one surface of the circuit board faces the inner wall of the shell, the reed pipe is connected to the other surface of the circuit board, and the reed pipe is located in the groove and coaxial with the shell.
Optionally, the connecting part is of a circular truncated cone structure, and the center of the connecting part is provided with the via hole; the supporting part is a supporting plate with a semicircular section, and the center of the supporting plate is provided with a groove corresponding to the via hole.
Optionally, a fixer is arranged on the inner support seat, and the fixer locks the cable and the inner support seat.
Optionally, the cable is a 4-core cable, three cables receive reed pipe signals, and the other cable is a ground wire, and the ground wire is fixed on the inner support base through a ground screw.
Optionally, the inner wall of the open end of the outer shell is provided with an anti-falling structure for preventing the glue pouring part from falling off the outer shell.
Optionally, the potting material is high-temperature-resistant epoxy resin; the shell and the inner supporting seat are both made of metal, and the circuit board is a ceramic circuit board or a circuit board with ceramic base materials.
The utility model also provides an induction type limit switch, including trigger device with limit switch's induction system.
Optionally, trigger device includes trigger shaft and one end confined trigger axle sleeve, the mounting hole has been seted up to the one end of trigger shaft, from interior to installing spring, gasket and permanent magnet outward in proper order in the mounting hole, the spring passes through the gasket and outwards jacks up the permanent magnet, the trigger axle sleeve is established outside the trigger shaft to keep off the outer end at the permanent magnet, trigger axle sleeve and trigger shaft cup joint through the screw thread to through the round pin axle locking of wearing to establish perpendicularly.
As mentioned above, the utility model has the advantages that: the utility model discloses, the tongue tube is installed on the circuit board, and the circuit board is supported through the inner support seat fixed in the shell, has improved the stability of each part installation, has reduced the broken risk of the glass pipe of tongue tube to and prevent the relative motion of each part and shell; in addition, the cable exit is sealed through the encapsulating, makes inside device and external environment keep apart, has avoided inside device and welding point to appear oxidation corrosion and drop in exposing for a long time in the air, leads to the problem of switching signal interrupt.
Drawings
Fig. 1 is an exploded view of an induction device according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of an induction device according to an embodiment of the present invention;
FIG. 3 is a perspective view of the inner support base shown in FIG. 1;
fig. 4 is a schematic structural diagram of a limit switch according to an embodiment of the present invention;
fig. 5 is an exploded view of a middle trigger assembly according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of a mid-trigger device in accordance with an embodiment of the present invention.
Part number description:
1-a housing; 11-a lock nut; 12-a lock washer; 13-step; 14-anti-falling structure; 2-inner supporting seat; 21-a connecting part; 22-a support; 23-a groove; 24-a via; 25-a fixed table; 3-a circuit board; 4-reed pipe; 5-a cable; 6-epoxy resin; 7-a holder; 81-a first screw; 82-a second screw; 83-ground screw; 91-a trigger shaft; 92-trigger sleeve; 93-permanent magnet; 94-a gasket; 95-a spring; 96-pin shaft; 97-pin holes; 98-locking nut; 99-a lock washer; 100-a sensing device; 200-trigger means.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Examples
As shown in fig. 1 to 3, the sensing device of the limit switch in this example includes a housing 1, a circuit board 3, a reed pipe 4 and a signal cable 5, wherein the housing 1 is in a tubular structure, the diameter of one end with a thread is smaller, and the diameter of one end led out by the cable 5 is larger; wherein the inner chamber of shell 1 is provided with inner support seat 21, and inner support seat 21 installs on the inner wall of shell 1, and inner support seat 21 is gone up to circuit board 3 fixed mounting, and tongue tube 4 installs on circuit board 3, and the first end of shell 1 is sealed, and the second end opening, cable 5 follow the second end insert in shell 1 and be connected with circuit board 3, and cable 5 draws forth from the open end of shell 1 promptly, it is sealed to glue filling between the open end of cable 5 and shell 1, will inner support seat 21, circuit board 3 and tongue tube 4 seal in shell 1, wherein between inner support seat 21 and the shell 1 inner wall to and can adopt screw connection fixed between circuit board 3 and the inner support seat 21, or other fastening methods.
The reed switch 4 is arranged on the circuit board 3, and the circuit board 3 is supported by the inner supporting seat 21 fixed in the shell 1, so that the mounting stability of each part is improved, the risk of breaking the glass tube of the reed switch 4 is reduced, and the relative motion of each part and the shell 1 is prevented; in addition, the outlet of the cable 5 is sealed by glue pouring, so that an internal device is isolated from the external environment, and the problem that the internal device and a welding point are exposed in the air for a long time and fall off due to oxidation corrosion, and the switching signal is interrupted is avoided.
Specifically, in this example, the reed switch 4 is of a single-pole double-throw type, three signal pins of COM, NC and NO are respectively led out, the reed switch 4 is fixed on the circuit board 3 by welding the 3 signal pins, three signal cables 5 are welded on the circuit board 3 by welding holes so as to receive a switch signal of the reed switch 4 and transmit the signal out through the cables 5, and the potting sealing can be made of epoxy resin and other materials.
In this example, the inner support base 21 includes the connecting portion 21 and the support portion 22 that are connected, in this example, the outer shell 1 is an integrated molding, the inner support base 21 is also an integrated structure, the connecting portion 21 is connected and fixed with the inner wall of the outer shell 1 through a plurality of first screws 81, the circuit board 3 is installed on the support portion 22 through a plurality of second screws 82, and the support portion 22 is close to the closed end, the connecting portion 21 is close to the open end, that is, as shown in fig. 2, the support portion 22 is located on the right side of the connecting portion 21, so that the inner support base 21 and the outer shell 1 can be assembled after the circuit board 3 and the reed pipe 4 are installed and fixed.
Specifically, the inner wall of the housing 1 is provided with a step 13, the connecting portion 21 is fixed on the step 13 by a first screw 81, a through hole 24 for the cable 5 to pass through is formed in the connecting portion 21, and the cable 5 is connected to the circuit board 3 after passing through the through hole 24 and is welded with a connecting point corresponding to the circuit board 3.
The supporting part 22 is transversely arranged in the casing 1, namely parallel to the casing 1, the supporting part 22 is provided with a groove 23, the circuit board 3 is fixed on the supporting part 22 through the second screw 82, the reed switch 4 is positioned in the groove 23, and the structure is that the reed switch 4 is positioned between the supporting part 22 and the circuit board 3.
Moreover, in this example, the inner support base is disposed coaxially with the housing 1, as shown in fig. 2, one surface of the circuit board 3 facing away from the groove faces the inner wall (i.e., the lower surface in fig. 2) of the housing 1, the reed switch 4 is located on the other surface of the circuit board 3, the reed switch 4 is located in the groove, and the reed switch 4 is located between the support portion 22 and the circuit board 3, so as to protect the reed switch 4 from collision; on the other hand, the glass tube body part of the reed switch 4 is coaxial with the housing 1, and the structure is such that when the trigger device approaches the sensing device from all directions, the relative position of the trigger is the same, for example, in fig. 3, when the trigger device and the sensing device approach in the up-down direction or the front-back direction (direction perpendicular to the axis), the trigger distance is the same because the reed switch 4 is located at the center of the housing 1.
In order to prevent the cable from retreating out of the shell 1 in the dragging process after the glue filling part is cured, an anti-disengaging structure 14 for preventing the glue filling part from being disengaged from the shell is arranged on the inner wall of the opening end of the shell 1, and the anti-disengaging structure 14 can be a groove, a bulge and other structures arranged on the inner wall, so that the glue filling part is embedded into the inner wall of the shell 1, and the resistance is increased; in this embodiment, the retaining structure 14 is a screw structure disposed on the inner wall of the housing 1 for easy manufacturing.
For convenience of manufacturing and processing, the connecting part 21 is of a circular truncated cone structure, the center of the connecting part is provided with the through hole 24, the supporting part 22 is a supporting plate with a semicircular section, and the center of the supporting plate is provided with the groove 23 corresponding to the through hole 24; alternatively, the support 22 is a semi-annular structure and the circuit board 3 is mounted on the wall of the semi-annular tube.
In order to prevent welding looseness between the cable 5 and the circuit board 3 caused by pulling, a fixer 7 is arranged on the inner supporting seat 21, the fixer 7 locks the cable 5 and the inner supporting seat 21, in the embodiment, the fixer 7 is a pressing plate, is installed on the inner supporting seat 21 through a third screw, is specifically connected with the connecting part 21 of the supporting seat, extends outwards in the axial direction through the connecting part 21 to form a fixing platform 25 protruding out of the outer end of the connecting part 21, the fixing platform 25 is in a semi-annular structure, and the pressing plate fixes the cable 5 on the side surface of the fixing platform 25 and is locked through the screw.
The cables 5 are 4-core cables 5, three of which receive signals of the reed pipes 4, and the other of which is a grounding wire fixed on the inner support base 21 through a grounding screw 83, in this example, the grounding wire is fixed in the groove 23.
The sensing device in the prior art uses the plastic groove 23 to assemble the reed pipe 4, uses metal as the shell 1 and utilizes an O-shaped ring for packaging, and the like, but the fixing and packaging mode of the reed pipe 4, the limit switch structure and the used materials can not meet the requirements of some industrial fields on the limit switch of the valve, and particularly can not normally work under the severe environment of high temperature and irradiation.
Therefore, in this example, the material of the potting adhesive is high temperature resistant epoxy resin 6. The high temperature resistant epoxy resin 6 in this example refers to an epoxy resin resistant to high temperature of more than 200 degrees, and can be made of products of any company in the prior art, such as epoxy resin sealant with model number of EPOCAP 16717A/B, single-component epoxy glue with model number of JL-6103, high temperature resistant epoxy resin structural glue with model number of DP8405NS, epoxy resin AB glue with model number of DP760, and the like; in other embodiments, the epoxy resin suitable for the corresponding temperature environment is selected according to the application environment of the switch. The housing 1 and the inner support base 21 are made of metal, such as stainless steel, and the circuit board 3 is a ceramic-based circuit board 3. The whole body is made of stainless steel materials, the circuit board 3 is made of ceramic-based materials, the environmental suitability is strong, and normal work is guaranteed under severe conditions. So that the induction device can adapt to high temperature and irradiation environment.
As shown in fig. 4, the present invention further provides an inductive limit switch, which includes a trigger device 200 and the inductive device 100 of the limit switch.
As shown in fig. 5 and 6, the triggering device includes a triggering shaft 91 and a triggering shaft sleeve 92, one end of the triggering shaft 91 is provided with a hole, the outer wall of the triggering shaft 91 is provided with a thread, a spring 95, a gasket 94 and a permanent magnet 93 are installed in the hole of the triggering shaft 91, the spring 95 abuts against the bottom of the hole, the permanent magnet 93 is jacked outwards through the gasket 94, one end of the triggering shaft sleeve 92 is closed, the other end of the triggering shaft sleeve 92 is open, the triggering shaft 91 is sleeved with a screw thread and is blocked at the outer end of the permanent magnet 93, the permanent magnet 93 is axially limited, and the permanent magnet 93, the triggering shaft 91 and the triggering shaft sleeve 92 are coaxially arranged so as to be the same as the triggering distance of the sensing device in each radial direction; the triggering shaft sleeve 92 and the triggering shaft 91 are correspondingly provided with a pin hole 97 along the direction perpendicular to the triggering shaft 91, the triggering shaft sleeve 92 and the triggering shaft 91 are screwed by internal and external threads and are locked by a pin shaft 96 inserted into the pin hole 97, and the combination of a spring 95 and a gasket 94 in the triggering device solves the fixing problem of the magnet.
The shell 1 of the induction device and the trigger shaft 91 of the trigger device are both provided with threads, and are respectively provided with a pair of locking washers 12 and 99 and a pair of locking nuts 11 and 98, so that the limit switch can be conveniently mounted and dismounted.
The utility model discloses, except that signal cable 5, 6 packaging material of high temperature epoxy, tongue tube 4 and circuit board 3, other all adopt stainless steel material, circuit board 3 adopts ceramic-based material, and used device all chooses for use high temperature resistant and irradiation material, and environmental suitability is strong, guarantees normal work at harsh condition.
The induction system adopts the sleeve structure mode of the inner supporting seat 21 and the shell 1, adopts clearance fit, and the reed pipe 4 and the circuit board 3 are fixed on the inner supporting seat 21, sealed by the high-temperature epoxy resin 6, not directly communicated with the outside, and can protect the switch device from being damaged.
The cable 5 is locked to the inner support base 21 by the retainer 7 so that the signal cable 5 is not broken by an external force.
Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a limit switch's induction system, includes shell, circuit board, tongue tube and cable, its characterized in that: the dry reed switch is characterized by further comprising an inner supporting seat arranged on the inner wall of the shell, the dry reed switch is arranged on the circuit board, the circuit board is fixed on the inner supporting seat, one end of the shell is closed, the other end of the shell is open, the cable is connected with the circuit board and led out from the open end of the shell, glue is filled between the cable and the open end of the shell for sealing, and the inner supporting seat, the circuit board and the dry reed switch are sealed in the shell.
2. The limit switch sensing device of claim 1, wherein: the inner support seat comprises a connecting portion and a supporting portion which are connected, the connecting portion is connected with the inner wall of the shell, the circuit board is installed on the supporting portion, the supporting portion is close to the closed end, and the connecting portion is close to the open end.
3. The limit switch sensing device of claim 2, wherein: the shell inner wall is provided with the step, connecting portion pass through first fix with screw on the step, just be provided with the via hole that is used for the cable to pass through on the connecting portion.
4. The limit switch sensing device of claim 3, wherein: the support part is provided with a groove, the circuit board is fixed on the support part through a second screw, one surface of the circuit board faces the inner wall of the shell, the reed switch is connected to the other surface of the circuit board, and the reed switch is located in the groove and coaxial with the shell.
5. The limit switch sensing device of claim 4, wherein: the connecting part is of a circular truncated cone structure, and the center of the connecting part is provided with the through hole; the supporting part is a supporting plate with a semicircular section, and the center of the supporting plate is provided with a groove corresponding to the via hole.
6. The limit switch sensing device of claim 1, wherein: and a fixer is arranged on the inner supporting seat and locks the cable and the inner supporting seat.
7. The limit switch sensing device of claim 1, wherein: the inner wall of the open end of the shell is provided with an anti-disengaging structure used for preventing the glue pouring part from disengaging from the shell.
8. The limit switch sensing device of any one of claims 1-7, wherein: the material for the glue pouring sealing is high-temperature-resistant epoxy resin; the shell and the inner supporting seat are both made of metal, and the circuit board is a circuit board made of ceramic base materials.
9. An induction type limit switch is characterized in that: sensing device comprising a trigger device and a limit switch according to any of claims 1-8.
10. The inductive limit switch of claim 9, wherein: trigger device includes trigger shaft and one end confined trigger axle sleeve, the mounting hole has been seted up to the one end of trigger shaft, from interior to installing spring, gasket and permanent magnet outward in proper order in the mounting hole, the spring passes through the gasket and outwards jacks up the permanent magnet, the trigger axle sleeve is established outside the trigger shaft to keep off the outer end at the permanent magnet, trigger axle sleeve and trigger shaft cup joint through the screw thread to through the round pin axle locking of wearing to establish perpendicularly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120203261.9U CN214378221U (en) | 2021-01-25 | 2021-01-25 | Limit switch's induction system and induction type limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120203261.9U CN214378221U (en) | 2021-01-25 | 2021-01-25 | Limit switch's induction system and induction type limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214378221U true CN214378221U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120203261.9U Active CN214378221U (en) | 2021-01-25 | 2021-01-25 | Limit switch's induction system and induction type limit switch |
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| CN (1) | CN214378221U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967894A (en) * | 2021-01-25 | 2021-06-15 | 重庆川仪自动化股份有限公司 | Limit switch's induction system and induction type limit switch |
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2021
- 2021-01-25 CN CN202120203261.9U patent/CN214378221U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967894A (en) * | 2021-01-25 | 2021-06-15 | 重庆川仪自动化股份有限公司 | Limit switch's induction system and induction type limit switch |
| CN112967894B (en) * | 2021-01-25 | 2024-04-09 | 重庆川仪自动化股份有限公司 | Limit switch's induction system and induction type limit switch |
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