Strong-vibration-resistant induction limit switch

Abstract

The utility model provides an anti-strong vibration induction limit switch, including the shell, trigger device, reset device and COM contact subassembly, the shell is cylindrical, the inside of shell is provided with the shaft lever along its axial direction, the COM contact subassembly includes fixed seat, swivel mount and spring, the fixed seat is provided in the shell, the swivel mount is provided with the spring, the spring is provided with the spring, the swivel mount is provided with the reset device, the COM contact subassembly is provided with the reset device, and the COM contact subassembly is provided with the reset device. The rotating frame is hinged to the fixing base, one end of the spring is connected with the end, far away from the hinge point, of the rotating frame, the other end of the spring moves along with the shaft rod, an NC end contact and an NO end contact are further arranged in the end, far away from the main magnet, of the shell, and the shaft rod moves in the axial direction. The COM contact assembly is connected with the NC end contact or the NO end contact, so that the COM contact assembly is contacted with the NC end contact or the NO end contact, and the COM contact assembly has the advantages that the COM contact assembly is always subjected to the tension of the spring by utilizing the elasticity of the spring, strong vibration can be resisted, and the COM contact assembly is not easily triggered by mistake in a strong vibration environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of switch device especially relates to a strong vibration resistance induction limit switch. BACKGROUND

[0002] Limit switch is a kind of field instrument in automatic control system to detect the valve state, to the opening or closing position of valve with switch quantity (contact) Signal output, can be used as the important valve interlock protection and remote alarm indication in automatic system, is the core accessory of valve, plays a very important role in automatic control.

[0003] Inductive limit switch is more reliable and has higher life, wider electrical performance adaptation and wider application occasions compared with mechanical limit switch and swing-arm limit switch. The inductive limit switch commonly used in market is mainly magnetic spring type, is difficult to be applied to the working condition with strong vibration due to the influence of internal magnetic spring element, and dry reed tube performance stability is slightly poor, and reliability is not high, and multi-magnetic structure is prone to false triggering in strong vibration environment, COM contact assembly part COM terminal contact is short and close to upper and lower contacts, and the quality is lighter, when being applied to relatively strong vibration condition, contact has no displacement margin, and the displacement generated by action assembly can make contact leave original position, to cause false triggering. SUMMARY

[0004] In view of the above-mentioned defects of prior art, the purpose of the utility model is to provide a strong vibration resistance induction limit switch, to solve the technical problem that multi-magnetic structure is prone to false triggering in strong vibration environment in prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a strong vibration resistance induction limit switch, comprising:

[0006] Shell, the shell is cylindrical, the shaft is arranged in the shell along its axial direction, one end of the shaft is provided with main magnet;

[0007] Trigger device, when the trigger device is close to the shell, the trigger device drives the shaft to move axially;

[0008] Reset device, when the trigger device is away from the shell, the reset device is used to drive the shaft to reset;

[0009] COM contact assembly, the COM contact assembly includes fixed seat, rotating frame and trigger spring, the fixed seat is arranged in the shell, the rotating frame is hingedly arranged on the fixed seat, one end of the trigger spring is connected with the end of the rotating frame away from its hinge point, the other end of the trigger spring moves with the shaft;

[0010] The NC end contact and the NO end contact are arranged in the end of the shell away from the main magnet, and the axial movement of the shaft rod causes the COM contact assembly to contact the NC end contact or the NO end contact.

[0011] The above technical scheme has the advantages that the trigger spring is arranged on the COM contact assembly, the spring elasticity is utilized, the COM contact assembly is always subjected to the spring tension, and the strong vibration is resisted, and the COM contact assembly is not easily triggered by mistake in the strong vibration environment.

[0012] Optionally, the main magnet, the shaft rod, the annular magnet and the biasing magnet are arranged in the shell, the annular magnet is fixedly arranged in the shell, the shaft rod is movably arranged in the shell, the shaft rod passes through the annular magnet, and the biasing magnet is connected to the other end of the shaft rod.

[0013] The main magnet is magnetically attracted to the annular magnet, the trigger device is magnetically attracted to the main magnet, the annular magnet is magnetically repelled to the biasing magnet, and the annular magnet and the biasing magnet form the reset device.

[0014] Optionally, the magnetic guide sleeve is further arranged in the shell, the shaft rod passes through the magnetic guide sleeve, and the magnetic guide sleeve is located between the annular magnet and the main magnet.

[0015] Optionally, the fixed shell is further arranged in the shell, the fixed shell is in a cylindrical shape, the outer wall of the fixed shell is tightly abutted to the inner wall of the shell, the annular magnet is embedded in the inner wall of the fixed shell, and the shaft rod movably passes through the fixed shell.

[0016] Optionally, the button is further arranged in the fixed shell, the button is connected to the biasing magnet and moves with the biasing magnet, and the displacement of the button is used to drive the COM contact assembly to switch between the NC end contact and the NO end contact.

[0017] Optionally, the electrical interface end is further arranged in the end of the shell away from the main magnet, and the electrical interface end is sealed with the shell.

[0018] Optionally, the main magnet shell is further arranged outside the main magnet, the main magnet shell is wrapped outside the main magnet, and the shaft rod is connected to the main magnet shell.

[0019] Optionally, the trigger device comprises the target sleeve, the trigger magnet is further arranged in the target sleeve, the trigger magnet is located between the target sleeve and the target sealing sleeve, and the plug-in groove is arranged on the target sealing sleeve.

[0020] Optionally, a plurality of first shock-absorbing springs are arranged between the trigger magnet and the target sealing sleeve.

[0021] Optionally, a second shock-absorbing spring is arranged between the biasing magnet and the key.

[0022] As described above, the anti-strong-vibration inductive limit switch has the following beneficial effects: in the application, the spring elasticity of the COM contact assembly is utilized, so that the COM contact assembly is always subjected to the spring tension force, and can resist strong vibration and is not easily mis-triggered in a strong vibration environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A cross-sectional structure schematic diagram in an embodiment of the anti-strong-vibration inductive limit switch is shown;

[0024] Figure 2 An X local enlarged schematic diagram in an embodiment of the anti-strong-vibration inductive limit switch is shown;

[0025] Figure 3 A cross-sectional structure schematic diagram of a trigger device in an embodiment of the anti-strong-vibration inductive limit switch is shown;

[0026] Figure 4 A working state schematic diagram of an embodiment of the anti-strong-vibration inductive limit switch is shown.

[0027] PART NUMBER EXPLANATION

[0028] 1 housing

[0029] 2 main magnet

[0030] 3 shaft rod

[0031] 4 ring magnet

[0032] 5 biasing magnet

[0033] 6 COM contact assembly

[0034] 601 trigger spring

[0035] 7 NC end contact

[0036] 8 NO end contact

[0037] 9 magnetic conducting sleeve

[0038] 10 fixed shell

[0039] 11 key

[0040] 12 target sleeve

[0041] 13 target sealing sleeve

[0042] 14 trigger magnet DETAILED DESCRIPTION

[0043] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0044] See also Figures 1 to 4 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. The illustrations only show the components related to the present invention rather than being drawn according to the number, shape and size of the components during actual implementation. During implementation, the type, quantity and proportion of each component can be changed at will, and the component layout may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the conditions under which the present invention can be implemented, so they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0045] See Figures 1 to 4 As shown, the utility model provides a strong vibration resistant inductive limit switch, comprising:

[0046] The housing 1 is cylindrical, and a shaft 3 is provided in the axial direction of the housing 1;

[0047] A trigger device, when the trigger device is close to the housing 1, the trigger device drives the shaft 3 to move axially;

[0048] a reset device, which is used to drive the shaft 3 to reset when the trigger device is away from the housing 1;

[0049] A COM contact assembly 6 is arranged in the housing 1, which includes a fixed seat, a rotating frame and a trigger spring 601, the rotating frame is hingedly arranged on the fixed seat, one end of the trigger spring 601 is connected with the end of the rotating frame away from the hinge point, and the other end of the trigger spring 601 moves with the shaft 3;

[0050] An NC end contact 7 and a NO end contact 8 are arranged in the end of the housing 1 away from the main magnet 2, and the axial movement of the shaft 3 makes the COM contact assembly 6 contact the NC end contact 7 or the NO end contact 8.

[0051] The NC (Normally Closed) end contact means that in the normal state when the switch is not activated (i.e. no external magnetic object is close or no preset position is reached), the NC end contact is closed and the current can pass through;

[0052] The NO (Normally Open) end contact is open in the normal state when the switch is not activated, and the current cannot pass through;

[0053] COM in the COM contact assembly represents Common Terminal. It is a common switch wiring method for connecting or disconnecting the connection between other contacts (such as NC and NO contacts) and power supply;

[0054] It should be noted that when the main magnet 2 is away from the trigger device, the annular magnet 4 attracts the main magnet 2 to be close to the annular magnet 4, and the COM contact assembly 6 contacts the NC end contact 7;

[0055] When the main magnet 2 is close to the trigger device, the main magnet 2 is attracted away from the annular magnet 4, so that the COM contact assembly 6 contacts the NO end contact 8.

[0056] For example, the housing 1 is provided with a main magnet 2, a shaft 3, an annular magnet 4 and a biasing magnet 5, the annular magnet 4 is fixedly arranged in the housing 1, the shaft 3 is movably arranged in the housing 1, the shaft 3 passes through the annular magnet 4, and the main magnet 2 and the biasing magnet 5 are respectively connected to the two ends of the shaft 3;

[0057] The main magnet 2 is magnetically attracted to the annular magnet 4, the trigger device is magnetically attracted to the main magnet 2, the annular magnet 4 is magnetically repelled from the biasing magnet 5, and the annular magnet 4 and the biasing magnet 5 constitute the reset device.

[0058] It should be noted that the magnetic properties of the main magnet 2, the annular magnet 4 and the bias magnet 5 are used as driving force to move the trigger device to adsorb the main magnet 2, wherein the main magnet 2, the annular magnet 4 and the bias magnet 5 are all samarium-cobalt permanent magnets with high magnetic energy product and stable magnetic properties.

[0059] Exemplarily, a magnetic guide sleeve 9 is further arranged in the shell 1, the shaft 3 passes through the magnetic guide sleeve 9, and the magnetic guide sleeve 9 is located between the annular magnet 4 and the main magnet 2.

[0060] It should be noted that the magnetic guide sleeve 9 is used to guide the direction of the magnetic field, ensure that the magnetic field can pass along the predetermined path, thereby improving the utilization rate of the magnetic field and the sensitivity of the switch, and through the focusing and enhancing effect of the magnetic guide sleeve, a strong magnetic field area is formed in the switch, which helps to more accurately detect the position or state of the magnetic object, and then trigger the switch action.

[0061] Exemplarily, a fixed shell 10 is further arranged in the shell 1, the fixed shell 10 is in a cylindrical shape, the outer wall of the fixed shell 10 is tightly abutted against the inner wall of the shell 1, the annular magnet 4 is embedded in the inner wall of the fixed shell 10, and the shaft 3 is movably arranged in the fixed shell 10.

[0062] Exemplarily, a button 11 is further arranged in the fixed shell 10, the button 11 is connected with and moves along with the bias magnet 5, and the displacement of the button 11 is used to drive the COM contact assembly 6 to switch between the NC end contact 7 and the NO end contact 8.

[0063] It should be noted that when the shaft 3 moves horizontally, the button 11 is driven to drive the COM contact assembly 6 to contact the NC end contact 7 or the NO end contact 8.

[0064] Exemplarily, an electrical interface end is further arranged at the end of the shell 1 away from the main magnet 2, the electrical interface end is sealed with the shell 1, the electrical interface end is connected and sealed with the metal shell through laser welding, the contact pin corresponds to the signal port of the electrical connector, the switch signal is transmitted to the monitoring end through the electrical connector.

[0065] In one embodiment, a direct outlet port is arranged at the end of the shell 1 away from the main magnet 2, a PEEK cable is fixed to the metal shell through screws together with an adapter PCB, a stainless steel lead clasp is used to fix the cable to the cable fastening through screws, the cable core is welded with the contact clasp, the switch signal is connected to the monitoring end, and then an epoxy resin is used for sealing treatment.

[0066] Exemplarily, the main magnet 2 is further provided with a main magnet shell, the main magnet shell is wrapped outside the main magnet 2, and the shaft rod 3 is connected with the main magnet shell.

[0067] It should be further explained that the main magnet shell is arranged to protect the main magnet 2 and avoid abrasion of the main magnet 2 during movement.

[0068] Exemplarily, the trigger device comprises a target sleeve 12 and a target sealing sleeve 13, a trigger magnet 14 is further arranged in the target sleeve 12, the trigger magnet 14 is located between the target sleeve 12 and the target sealing sleeve 13, and a plug-in groove is arranged on the target sealing sleeve 13.

[0069] Exemplarily, a plurality of first damping springs are further arranged between the trigger magnet 14 and the target sealing sleeve 13.

[0070] It should be further explained that the first damping springs are arranged to ensure that the samarium-cobalt permanent magnet is not broken under strong vibration, and the magnets are ensured to be located in the limited position by the springs, so that the consistency of product performance parameters is ensured.

[0071] Exemplarily, a second damping spring is further arranged between the bias magnet 5 and the button 11.

[0072] It should be further explained that the second damping spring is arranged to ensure that the samarium-cobalt permanent magnet is not broken under strong vibration, and the magnets are ensured to be located in the limited position by the springs, so that the consistency of product performance parameters is ensured.

[0073] In summary, the anti-strong-vibration induction limiting switch is provided with the spring on the COM contact assembly 6 in the application, the spring is elastically used to enable the COM contact assembly 6 to be always subjected to the spring tension force, strong vibration can be resisted, and the COM contact assembly 6 is not easily triggered by mistake in the strong-vibration environment.

[0074] The above embodiment only exemplarily illustrates the principle and effect of the anti-strong-vibration induction limiting switch, and is not used to limit the anti-strong-vibration induction limiting switch. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and category of the anti-strong-vibration induction limiting switch. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the anti-strong-vibration induction limiting switch should be covered by the claims of the anti-strong-vibration induction limiting switch.

[0075] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A strong vibration resistant inductive limit switch, characterized in that: The utility model relates to a kind of switch, including: Shell (1), the shell (1) the shell (1) is cylindrical, and the shaft (3) is provided in the shell (1) along its axial direction, and one end of the shaft (3) is provided with main magnet (2); Trigger device, when the trigger device is close to the shell (1), the trigger device drives the shaft (3) to move axially; Reset device, when the trigger device is away from the shell (1), the reset device is used to drive the shaft (3) to reset; COM contact assembly (6), the COM contact assembly (6) includes fixed seat, rotating frame and trigger spring (601), the fixed seat is arranged in the shell (1), the rotating frame is hingedly arranged on the fixed seat, one end of the trigger spring (601) is connected with the end of the rotating frame away from its hinged point, the other end of the trigger spring (601) moves with the shaft (3); NC end contact (7) and NO end contact (8) are further provided in the end of the shell (1) away from the main magnet (2), and the axial movement of the shaft (3) makes the COM contact assembly (6) contact the NC end contact (7) or the NO end contact (8).

2. A shock sensitive limit switch according to claim 1, wherein: The shaft (3), the annular magnet (4) and the bias magnet (5) are installed in the shell (1), the annular magnet (4) is fixedly arranged in the shell (1), the shaft (3) is movably arranged in the shell (1), the shaft (3) passes through the annular magnet (4), and the bias magnet (5) is connected to the other end of the shaft (3); The main magnet (2) and the annular magnet (4) are magnetically attracted, the trigger device and the main magnet (2) are magnetically attracted, the annular magnet (4) and the bias magnet (5) are magnetically repelled, and the annular magnet (4) and the bias magnet (5) constitute the reset device.

3. A shock sensitive limit switch according to claim 2, wherein: A magnetically conductive sleeve (9) is further provided in the shell (1), the shaft (3) passes through the magnetically conductive sleeve (9), and the magnetically conductive sleeve (9) is located between the annular magnet (4) and the main magnet (2).

4. A shock sensitive limit switch according to claim 3, wherein: The inside of the shell (1) is further provided with a fixed shell (10), the fixed shell (10) is cylindrical, the outer wall of the fixed shell (10) is tightly closed to the inner wall of the shell (1), the annular magnet (4) is embedded in the inner wall of the fixed shell (10), and the shaft (3) is movably arranged in the fixed shell (10).

5. A shock sensitive limit switch according to claim 4, wherein: A key (11) is further provided in the fixed shell (10), the key (11) is connected with the bias magnet (5) and moves with the bias magnet (5), and the displacement of the key (11) is used to drive the COM contact assembly (6) to switch between the NC end contact (7) and the NO end contact (8).

6. A shock sensitive limit switch according to claim 5 wherein: An electrical interface end is further provided at the end of the shell (1) away from the main magnet (2), and the electrical interface end is sealed with the shell (1).

7. A shock sensitive limit switch according to claim 6 wherein: The outside of the main magnet (2) is further provided with a main magnet shell, the main magnet shell wraps the outside of the main magnet (2), and the shaft (3) is connected with the main magnet shell.

8. A shock sensitive limit switch according to claim 7, wherein: The trigger device comprises a target sleeve (12) and a target sealing sleeve (13), and a trigger magnet (14) is further arranged in the target sleeve (12), the trigger magnet (14) is located between the target sleeve (12) and the target sealing sleeve (13), and the target sealing sleeve (13) is provided with a plug-in slot.

9. A shock sensitive limit switch according to claim 8, wherein: A plurality of first damping springs (15) are further arranged between the trigger magnet (14) and the target sealing sleeve (13).

10. A shock sensitive limit switch according to claim 7 wherein: Second damping springs (16) are further arranged between the biasing magnet (5) and the button (11).

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