High-reliability limit switch device
By designing a switch core with redundant contact combination in the limit switch, the problem of poor contact caused by contact deformation is solved, and the effect of high reliability and low signal error probability is achieved.
Patent Information
- Application Number
- CN202421655659.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The existing limit switches are prone to poor contact between contacts due to contact deformation after multiple actions, resulting in erroneous control signals and affecting the normal operation of the equipment or system.
A high-reliability limit switch device is designed, which adopts a switching core that includes at least two pairs of interconnected contacts and at least two pairs of fixed contacts in parallel, the interconnected contacts correspond one by one to the fixed contacts and are defined by their positional relationship to provide a redundant contact combination to ensure stable contact.
Through the redundant contact combination, we ensure that when any group of contacts has poor contact due to deformation or other reasons, the other group of contacts can maintain stable contact, reduce the probability of signal error, and improve the reliability of the limit switch.
Smart Images
Figure CN222980328U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mechanical limit switches, and particularly relates to a highly reliable limit switch device. Background Art
[0002] A limit switch (including a travel switch), as a device for detecting the operating position of a moving electrical device (such as for valve position detection or level detection, etc.), has been widely used in industrial sites and can convert the mechanical displacement signal into an electrical signal. The action of its contact is to use the mechanical displacement of some moving parts of the production equipment to collide with the switch, so that the contact acts to complete the control of the on or off of the switch circuit, thereby controlling the mechanical action or program execution.
[0003] Currently, a common limit switch is composed of four parts: a switch core, an operating rod, a base, and a housing. Among them, the switch core is the core component, which realizes the on or off of the circuit according to the action of the operating rod, and generally includes a normally open contact and a normally closed contact; the operating rod is used to trigger the action of the switch core when being pushed by an external force, so that the states of the normally open contact and the normally closed contact change; the base is used for installation and fixation and to protect the switch core from external factors, and is generally made by plastic pressing; the housing is used to contain the operating rod, the normally open contact, and the normally closed contact, and generally has two housing structures of metal and plastic.
[0004] However, the working environment of the limit switch is generally accompanied by vibration, and the vibration will cause poor contact between some contacts, that is, due to the contact between the contacts, there may be intermittent connection or the contact connection is disconnected, so that after the limit switch acts multiple times, some contacts may be deformed, and the deformed contacts will cause poor contact between the contacts, which may further cause the limit switch to send out wrong control signals and affect the normal operation of the controlled device or system. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a highly reliable limit switch device to solve the problem that the existing common limit switch is prone to poor contact between contacts due to contact deformation after multiple actions.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] In the first aspect, a highly reliable limit switch device is provided, including a switch core, an operating rod, and a base. Among them, the switch core includes at least two pairs of interconnected contacts and at least two pairs of fixed contacts connected in parallel. The at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of fixed contacts is not connected;
[0008] The at least two pairs of interconnected contacts are respectively arranged on the operating rod and located on the rotating surface of the operating rod, so that the at least two pairs of interconnected contacts rotate synchronously with the rotation of the operating rod.
[0009] The at least two pairs of parallel fixed contacts are respectively arranged on the base and face the rotating contact surface of the operating rod, so that when the operating rod rotates clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts respectively come into contact with or disengage from a corresponding pair of fixed contacts one by one; and when the operating rod rotates counterclockwise to the second target position, each pair of interconnected contacts respectively disengage from or come into contact with a corresponding pair of fixed contacts one by one.
[0010] Based on the above-mentioned utility model content, a new solution for a limit switch with high reliability is provided, that is, it includes a switch core, an operating rod and a base. Among them, the switch core includes at least two pairs of interconnected contacts and at least two pairs of parallel fixed contacts. The at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one. Each pair of fixed contacts in the at least two pairs of fixed contacts are not connected, and are defined by their positional relationship, and at least one set of redundant interconnected contacts and fixed contacts that can achieve make / break actions can be provided. In this way, when any contact in a certain set of interconnected contacts and fixed contacts has poor contact or other phenomena due to deformation or the like, stable contact can still be ensured through other sets of interconnected contacts and fixed contacts, achieving the purpose of high reliability of the limit switch and facilitating practical application and promotion.
[0011] In a possible design, the switch core includes an even number of pairs of interconnected contacts and an even number of pairs of parallel fixed contacts that correspond to the even number of pairs of interconnected contacts one by one.
[0012] In a possible design, half of the even number of pairs of interconnected contacts are arranged between the switch operating end of the operating rod and the rotation axis, and the other half of the even number of pairs of interconnected contacts are arranged between the other end of the operating rod and the rotation axis.
[0013] In a possible design, the half of the pairs of interconnected contacts correspond to the other half of the pairs of interconnected contacts one by one, and any two pairs of interconnected contacts with a corresponding relationship are arranged in central symmetry with the rotation axis as the center.
[0014] In a possible design, the switch core includes two pairs of interconnected contacts and two pairs of parallel fixed contacts that correspond to the two pairs of interconnected contacts one by one.
[0015] In a possible design, a spring for resetting the switch operating end is provided between the switch operating end of the operating rod and the base.
[0016] In a possible design, the contact spacing between each pair of interconnected contacts and the corresponding pair of fixed contacts when they are out of contact is positively correlated with the distance from the arrangement position of the corresponding interconnected contacts to the rotation axis of the operating rod.
[0017] In a possible design, the device further includes a housing for enclosing the switch core and the operating rod together with the base.
[0018] In a second aspect, another high-reliability limit switch device is provided, comprising a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of interconnected contacts and at least two pairs of fixed contacts in parallel, the at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of fixed contacts is not connected;
[0019] The operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of interconnected contacts are respectively arranged on the connecting rod, so that the at least two pairs of interconnected contacts synchronously perform linear reciprocating motion with the rotation of the operating rod;
[0020] The at least two pairs of fixed contacts are respectively arranged on the base and located in the linear movement direction of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one.
[0021] In a third aspect, another high-reliability limit switch device is provided, comprising a switch core, an operating rod and a base, wherein the switch core comprises at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts in parallel and at least two pairs of second fixed contacts in parallel, the at least two pairs of first fixed contacts correspond one-to-one to the at least two pairs of first interconnected contacts, the at least two pairs of second fixed contacts correspond one-to-one to the at least two pairs of second interconnected contacts, and each pair of fixed contacts in the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected;
[0022] The at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the operating rod and located on the rotating surface of the operating rod, so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts rotate synchronously with the rotation of the operating rod;
[0023] The at least two pairs of first fixed contacts are respectively arranged on the base and are also located on the rotating surface of the operating rod, so that when the operating rod is rotated clockwise to a first target position, each pair of first interconnected contacts in the at least two pairs of first interconnected contacts is respectively in contact with a corresponding pair of fixed contacts one by one, and when the operating rod is rotated counterclockwise to a second target position, each pair of first interconnected contacts is respectively out of contact with a corresponding pair of fixed contacts one by one;
[0024] The at least two pairs of second fixed contacts are respectively arranged on the base and are also located on the rotating surface of the operating rod, so that when the operating rod is rotated clockwise to the first target position, each pair of second interconnected contacts in the at least two pairs of second interconnected contacts is disengaged from the corresponding pair of fixed contacts one by one, and when the operating rod is rotated counterclockwise to the second target position, each pair of second interconnected contacts is contacted with the corresponding pair of fixed contacts one by one.
[0025] In a possible design, the first interconnection contact is arranged on a side of the operating rod in a clockwise rotation direction, and the second interconnection contact is arranged on a side of the operating rod in a counterclockwise rotation direction.
[0026] In a fourth aspect, another high-reliability limit switch device is provided, comprising a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts in parallel and at least two pairs of second fixed contacts in parallel, the at least two pairs of first fixed contacts correspond one-to-one to the at least two pairs of first interconnected contacts, the at least two pairs of second fixed contacts correspond one-to-one to the at least two pairs of second interconnected contacts, and each pair of fixed contacts in the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected;
[0027] The operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the connecting rod, so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts synchronously perform linear reciprocating motion with the rotation of the operating rod;
[0028] The at least two pairs of first fixed contacts are respectively arranged on the base and located in the linear movement advancing direction of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of first interconnected contacts in the at least two pairs of first interconnected contacts is respectively in contact with the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of first interconnected contacts is respectively out of contact with the corresponding pair of fixed contacts one by one;
[0029] The at least two pairs of second fixed contacts are respectively arranged on the base and located in the straight-line movement backward direction of the at least two pairs of interconnecting contacts, so that when the operating rod rotates clockwise to the first target position, each pair of second interconnecting contacts in the at least two pairs of second interconnecting contacts are respectively disengaged from the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of second interconnecting contacts are respectively brought into contact with the corresponding pair of fixed contacts one by one.
[0030] Beneficial effects of the above solution:
[0031] (1) The present invention creatively provides a new solution for a limit switch with high reliability, which includes a switch core, an operating rod and a base. Among them, the switch core includes at least two pairs of interconnecting contacts and at least two pairs of fixed contacts connected in parallel. The at least two pairs of fixed contacts correspond to the at least two pairs of interconnecting contacts one by one. Each pair of fixed contacts in the at least two pairs of fixed contacts are not connected and are defined by their positional relationship, and at least one set of redundant interconnecting contacts and fixed contacts that can achieve make-before-break / make-after-break actions can be provided. In this way, when any contact in a certain set of interconnecting contacts and fixed contacts has poor contact due to deformation or other reasons, stable contact can still be ensured through other sets of interconnecting contacts and fixed contacts, achieving the purpose of high reliability of the limit switch and facilitating practical application and promotion;
[0032] (2) It can also solve the problems of poor contact of individual contacts and false signals output by the existing limit switch due to on-site vibration. Through verification in the use of important equipment in nuclear power plants, it is found that the effect is good, and the probability of false signals can be reduced from 40% before to 0;
[0033] (3) This solution is simple and practical, easy to install, and can be applied to improve the performance of all limit switches in industrial sites. Description of the drawings
[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0035] Figure 1 It is a schematic structural diagram of the first high-reliability limit switch device provided by the embodiment of the present application.
[0036] Figure 2Schematic diagram of the second highly reliable limit switch device provided by the embodiment of the present application.
[0037] Figure 3 Schematic diagram of the third highly reliable limit switch device provided by the embodiment of the present application.
[0038] In the above-mentioned drawings: 2 - operating rod; 21 - switch operating end; 22 - rotation axis; 23 - rotation fulcrum; 241 - first contact support frame; 242 - second contact support frame; 3 - base; 4 - spring; 51 - first signal wire; 52 - second signal wire; 6 - pressure. Detailed implementation manners
[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but do not constitute a limitation to the present invention.
[0040] It should be understood that although terms such as first and second may be used herein to describe various objects, these objects should not be limited by these terms. These terms are only used to distinguish one object from another. For example, the first object can be called the second object, and similarly, the second object can be called the first object, without departing from the scope of the exemplary embodiments of the present invention.
[0041] It should be understood that for the term "and / or" that may appear in this article, it is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, or A and B exist simultaneously, etc.; another example, A, B, and / or C can mean any one of A, B, and C or any combination of them; for the term " / and" that may appear in this article, it is a description of another association object relationship, indicating that two relationships can exist. For example, A / and B can mean: A exists alone or A and B exist simultaneously, etc.; in addition, for the character " / " that may appear in this article, generally, the associated objects before and after represent an "or" relationship.
[0042] Embodiment 1
[0043] As Figure 1As shown, the first highly reliable limit switch device provided in this embodiment includes, but is not limited to, a switch core, an operating rod 2, and a base 3. Among them, the switch core includes, but is not limited to, at least two pairs of interconnected contacts (i.e., Figure 1 the contacts J and K in Figure 1 are a pair of interconnected contacts, and the contacts P and R are another pair of interconnected contacts, etc.) and at least two pairs of fixed contacts connected in parallel (i.e., Figure 1 the contacts A and B in Figure 1 are a pair of fixed contacts, and the contacts C and D are another pair of fixed contacts. These two pairs of fixed contacts are connected in parallel through a pair of signal lines: contact A is connected to contact C through the first signal line 51, and contact B is connected to contact D through the second signal line 52). The at least two pairs of fixed contacts correspond one-to-one with the at least two pairs of interconnected contacts (i.e., as Figure 1 shown, contacts A and B together correspond to contacts J and K, and contacts C and D together correspond to contacts P and R). Among the at least two pairs of fixed contacts, each pair of fixed contacts is not connected (i.e., as Figure 1 shown, contact A is not connected to contact B, and contact C is not connected to contact D); the at least two pairs of interconnected contacts are respectively arranged on the operating rod 2 (i.e., as Figure 1 shown, contacts J and K are installed on the operating rod 2 through the first contact support frame 241, and contacts P and R are installed on the operating rod 2 through the second contact support frame 242), and are located on the rotating surface of the operating rod 2 so that the at least two pairs of interconnected contacts rotate synchronously with the rotation of the operating rod 2; the at least two pairs of fixed contacts are respectively arranged on the base 3 and are also located on the rotating surface of the operating rod 2 so that when the operating rod 2 rotates clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts respectively contact the corresponding pair of fixed contacts one-to-one (i.e.,
[0044] as Figure 1 Figure 1 contact J contacts contact A, contact K contacts contact B, contact P contacts contact C, and contact R contacts contact D), and when the operating rod 2 rotates counterclockwise to the second target position, each pair of interconnected contacts respectively disengages from the corresponding pair of fixed contacts one-to-one (i.e., Figure 1 contact J disengages from contact A, contact K disengages from contact B, contact P disengages from contact C, and contact R disengages from contact D).
[0044] As Figure 1As shown, in the specific structure of the first highly reliable limit switch device, the switch core includes an even number of pairs of interconnected contacts (i.e., two pairs of interconnected contacts) and an even number of pairs of fixed contacts (i.e., two pairs of fixed contacts) that are in parallel and correspond one by one to the even number of pairs of interconnected contacts; the operating rod 2 and the base 3 are respectively the conventional configurations of existing limit switches. Based on the setting of the rotation fulcrum 23, when pressure 6 is applied to the switch operating end 21 of the operating rod 2, the operating rod 2 can be driven to rotate clockwise until it reaches the first target position where each pair of interconnected contacts respectively contacts a corresponding pair of fixed contacts one by one. When other forces opposite to the pressure 6 are applied to the switch operating end 21 of the operating lever 2, the operating rod 2 can be driven to rotate counterclockwise until it reaches the second target position where each pair of interconnected contacts respectively separates from contact with a corresponding pair of fixed contacts one by one. Since the switch core includes at least two pairs of interconnected contacts and at least two pairs of fixed contacts in parallel, there will be at least one set of redundant interconnected contact pairs and fixed contact pairs connected. When any contact in a certain set of interconnected contact pairs and fixed contact pairs has poor contact due to deformation or other reasons, stable contact can still be ensured through other sets of interconnected contact pairs and fixed contact pairs, achieving the purpose of high reliability of the limit switch. For example, when the operating rod 2 rotates clockwise to the first target position, assuming that there is poor contact between contact C and contact P, but since contact A and contact J as well as contact B and contact K are in stable contact, it will make the state between contact A and contact B and between contact C and contact D closed, and a highly reliable switch quantity signal can still be correctly output. In addition, any one of the at least two pairs of fixed contacts can be used as a pair of switch terminals to output a stable switch quantity.
[0045] Preferably, half of the even number of pairs of interconnected contacts are arranged between the switch operating end 21 of the operating rod 2 and the rotation axis 22, and the other half of the even number of pairs of interconnected contacts are arranged between the other end of the operating rod 2 and the rotation axis 22. Half of the half of the pairs of interconnected contacts refers to half of the total number. For example, when the even number of pairs of interconnected contacts is 4 pairs of interconnected contacts, the half of the pairs of interconnected contacts refers to 2 pairs of interconnected contacts among the 4 pairs of interconnected contacts, and the other half of the pairs of interconnected contacts refers to the other 2 pairs of interconnected contacts among the 4 pairs of interconnected contacts. As Figure 1As shown, the even pairs of interconnected contacts are exemplified by 2 pairs of interconnected contacts: the contact P and the contact R are arranged between the switch operating end 21 and the rotation axis 22, and the contact J and the contact K are arranged between the other end of the operating rod 2 and the rotation axis 22. Further preferably, the first half of the pairs of interconnected contacts correspond one by one to the second half of the pairs of interconnected contacts, and any two pairs of interconnected contacts with a corresponding relationship are arranged in central symmetry with the rotation axis 22 as the center. As Figure 1 shown, the contact P and the contact R together correspond to the contact J and the contact K, and they are arranged in central symmetry with the rotation axis 22 as the center.
[0046] Preferably, a spring 4 for resetting the switch operating end 21 is provided between the switch operating end 21 of the operating rod 2 and the base 3. As Figure 1 shown, through the arrangement of the spring 4, after the pressure 6 acts, the spring 4 can be compressed, and after the pressure 6 is withdrawn, the elastic force opposite to the pressure 6 can be applied to the switch operating end 21 by using the deformation recovery characteristic of the spring 4.
[0047] Preferably, the contact spacing when each pair of interconnected contacts is separated from the corresponding pair of fixed contacts is positively correlated with the distance from the arrangement position of the corresponding interconnected contacts to the rotation axis 22 of the operating rod 2. As Figure 1 shown, the contact spacing is represented by d 1 and the distance is represented by d 2 . d 1 needs to increase with the increase of d 2 and decrease with the decrease of d 2 (that is, d 1 is positively correlated with d 2 ). In this way, it can be ensured that when the operating rod 2 rotates clockwise to the first target position, each pair of interconnected contacts can respectively contact the corresponding pair of fixed contacts one by one simultaneously.
[0048] Preferably, it further includes a housing for enclosing the switch core and the operating rod 2 together with the base 3.
[0049] In summary, by adopting the first highly reliable limit switch device provided in this embodiment, the following technical effects are achieved:
[0050] (1) This embodiment provides a new solution for a limit switch with high reliability, which includes a switch core, an operating rod, and a base. Among them, the switch core includes at least two pairs of interconnected contacts and at least two pairs of fixed contacts connected in parallel. The at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one. Each pair of fixed contacts in the at least two pairs of fixed contacts is not connected, and is defined by their positional relationship. At least one set of redundant interconnected contacts and fixed contacts that can achieve make-before-break / make-after-break actions can be provided. In this way, when any contact in a certain set of interconnected contacts and fixed contacts has poor contact due to deformation or other reasons, stable contact can still be ensured through other sets of interconnected contacts and fixed contacts, achieving the purpose of high reliability of the limit switch and facilitating practical application and promotion;
[0051] (2) It can also solve the problems of poor contact of individual contacts and false signals output by the existing limit switch due to on-site vibration. Through verification in the use of important equipment in nuclear power plants, it is found that the effect is good, and the probability of false signals can be reduced from 40% before to 0;
[0052] (3) This solution is simple and practical, easy to install, and can be applied to improve the performance of all limit switches in industrial sites.
[0053] Embodiment 2
[0054] As Figure 2 shown, on the basis of the first highly reliable limit switch device provided in the foregoing Embodiment 1, this embodiment also provides another highly reliable limit switch device, which is different from Embodiment 1 in that: when the operating rod 2 rotates clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts are respectively separated from contact with a corresponding pair of fixed contacts one by one (that is, as Figure 2 shown, contact N and contact O are a pair of interconnected contacts, contact L and contact M are another pair of interconnected contacts, contact G and contact H are a pair of fixed contacts, contact E and contact F are another pair of fixed contacts. These two pairs of fixed contacts are connected in parallel through a pair of signal lines. Contact G and contact H together correspond to contact N and contact O, contact E and contact F together correspond to contact L and contact M. Contact N is separated from contact with contact G, contact O is separated from contact with contact H, contact L is separated from contact with contact E, and contact M is separated from contact with contact F), and when the operating rod 2 rotates counterclockwise to the second target position, each pair of interconnected contacts are respectively brought into contact with a corresponding pair of fixed contacts one by one (that is Figure 2In the embodiment of the invention, contact N contacts contact G, contact O contacts contact H, contact L contacts contact E, and contact M contacts contact F). In this way, when any contact in a certain group of interconnected contact pairs and fixed contact pairs has poor contact due to deformation or other reasons, stable contact can be ensured through other groups of interconnected contact pairs and fixed contact pairs, thereby achieving the purpose of high reliability of the limit switch.
[0055] The technical details and technical effects of this embodiment can be derived with reference to the first embodiment and will not be described in detail here.
[0056] Embodiment 3
[0057] Based on the two high-reliability limit switch devices provided in the above-mentioned embodiments 1 and 2, this embodiment further provides another high-reliability limit switch device, namely, comprising a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of interconnected contacts and at least two pairs of fixed contacts in parallel, the at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of fixed contacts is not connected; the operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of interconnected contacts are respectively arranged on the connecting rod. The at least two pairs of interconnected contacts are arranged on the base so that the at least two pairs of interconnected contacts synchronously make linear reciprocating motion with the rotation of the operating rod; the at least two pairs of fixed contacts are respectively arranged on the base and are located in the linear motion direction of the at least two pairs of interconnected contacts, so that when the operating rod is rotated clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one, and when the operating rod is rotated counterclockwise to the second target position, each pair of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one. The aforementioned cam mechanism is an existing mechanism that enables the follower rod to complete various complex movements (including linear motion, swinging, constant speed motion and non-constant speed motion) according to the working requirements, so that when the operating rod rotates, it drives the connecting rod (i.e., as the follower rod) and the at least two pairs of interconnected contacts to perform linear reciprocating motion, thereby enabling each pair of interconnected contacts to respectively contact or disengage with the corresponding pair of fixed contacts one by one during the linear reciprocating motion (i.e., contact when moving to one end of the straight line, and disengage when moving to the other end of the straight line). In addition, the cam mechanism can be specifically composed of conventional components such as a cam, a follower and a frame.
[0058] The technical details and technical effects of this embodiment can be derived by referring to Embodiment 1 or 2, and will not be described in detail here.
[0059] Embodiment 4
[0060] like Figure 3As shown, based on the two highly reliable limit switch devices provided in the foregoing Embodiment 1 and Embodiment 2, this embodiment further provides another highly reliable limit switch device, which includes a switch core, an operating rod 2, and a base 3. Among them, the switch core includes at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts connected in parallel, and at least two pairs of second fixed contacts connected in parallel. The at least two pairs of first fixed contacts correspond to the at least two pairs of first interconnected contacts one by one, and the at least two pairs of second fixed contacts correspond to the at least two pairs of second interconnected contacts one by one. Each pair of fixed contacts among the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected; the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the operating rod 2 and located on the rotating surface of the operating rod 2, so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts rotate synchronously with the rotation of the operating rod 2; the at least two pairs of first fixed contacts are respectively arranged on the base 3 and also located on the rotating surface of the operating rod 2, so that when the operating rod 2 rotates clockwise to the first target position, each pair of first interconnected contacts among the at least two pairs of first interconnected contacts respectively come into contact with a corresponding pair of fixed contacts one by one, and when the operating rod 2 rotates counterclockwise to the second target position, each pair of first interconnected contacts respectively separate from the corresponding pair of fixed contacts one by one; the at least two pairs of second fixed contacts are respectively arranged on the base 3 and also located on the rotating surface of the operating rod 2, so that when the operating rod 2 rotates clockwise to the first target position, each pair of second interconnected contacts among the at least two pairs of second interconnected contacts respectively separate from a corresponding pair of fixed contacts one by one, and when the operating rod 2 rotates counterclockwise to the second target position, each pair of second interconnected contacts respectively come into contact with the corresponding pair of fixed contacts one by one. As Figure 3 shown, the first interconnected contacts are arranged on one side of the operating rod 2 in the clockwise rotation direction, and the second interconnected contacts are arranged on one side of the operating rod 2 in the counterclockwise rotation direction. That is, this embodiment is the integration result of Embodiment 1 and Embodiment 2. Similarly, when any contact in a certain group of interconnected contact pairs and fixed contact pairs has poor contact due to deformation or other reasons, stable contact can still be ensured through other groups of interconnected contact pairs and fixed contact pairs, achieving the purpose of high reliability of the limit switch.
[0061] The technical details and technical effects of this embodiment can be deduced by referring to Embodiment 1 or Embodiment 2, and will not be elaborated here.
[0062] Embodiment 5
[0063] Based on the two high-reliability limit switch devices provided in the above-mentioned embodiments three and four, this embodiment further provides another high-reliability limit switch device, namely, comprising a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts in parallel and at least two pairs of second fixed contacts in parallel, the at least two pairs of first fixed contacts correspond one-to-one to the at least two pairs of first interconnected contacts, the at least two pairs of second fixed contacts correspond one-to-one to the at least two pairs of second interconnected contacts, and each pair of fixed contacts in the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected; the operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the connecting rod, so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts move in a straight line synchronously with the rotation of the operating rod. The at least two pairs of first fixed contacts are arranged on the base and located in the forward direction of the linear motion of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of first interconnected contacts in the at least two pairs of first interconnected contacts are respectively in contact with the corresponding pair of fixed contacts, and when the operating rod rotates counterclockwise to the second target position, each pair of first interconnected contacts are respectively disengaged from the corresponding pair of fixed contacts; the at least two pairs of second fixed contacts are arranged on the base and located in the backward direction of the linear motion of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of second interconnected contacts in the at least two pairs of second interconnected contacts are respectively disengaged from the corresponding pair of fixed contacts, and when the operating rod rotates counterclockwise to the second target position, each pair of second interconnected contacts are respectively in contact with the corresponding pair of fixed contacts.
[0064] The technical details and technical effects of this embodiment can be derived by referring to the third or fourth embodiment, and will not be described in detail here.
[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A high-reliability limit switch device, characterized in that: The invention comprises a switch core, an operating rod (2) and a base (3), wherein the switch core comprises at least two pairs of interconnected contacts and at least two pairs of fixed contacts connected in parallel, the at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of fixed contacts are not connected; The at least two pairs of interconnected contacts are respectively arranged on the operating rod (2) and located on the rotating surface of the operating rod (2), so that the at least two pairs of interconnected contacts rotate synchronously with the rotation of the operating rod (2); The at least two pairs of fixed contacts are respectively arranged on the base (3) and are also located on the rotating surface of the operating rod (2), so that when the operating rod (2) is rotated clockwise to a first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts is respectively in contact with or out of contact with a corresponding pair of fixed contacts, and when the operating rod (2) is rotated counterclockwise to a second target position, each pair of interconnected contacts is respectively in contact with or out of contact with a corresponding pair of fixed contacts.
2. The high-reliability limit switch device according to claim 1, characterized in that: The switch core comprises an even number of pairs of interconnected contacts and an even number of pairs of fixed contacts connected in parallel and corresponding one to one with the even number of pairs of interconnected contacts.
3. The high-reliability limit switch device according to claim 2, characterized in that: Half of the even-numbered pairs of interconnected contacts are arranged between the switch operating end (21) of the operating rod (2) and the rotation axis (22), and the other half of the even-numbered pairs of interconnected contacts are arranged between the other end of the operating rod (2) and the rotation axis (22).
4. The high-reliability limit switch device according to claim 2, characterized in that: The switch core comprises two pairs of interconnected contacts and two pairs of fixed contacts which are connected in parallel and correspond one to one with the two pairs of interconnected contacts.
5. The high-reliability limit switch device according to claim 1, characterized in that: A spring (4) for returning the switch operating end (21) to its original position is provided between the switch operating end (21) of the operating rod (2) and the base (3).
6. The high-reliability limit switch device according to claim 1, characterized in that: The contact spacing between each pair of interconnected contacts and the corresponding pair of fixed contacts when they are out of contact is positively correlated with the distance from the arrangement position of the corresponding interconnected contacts to the rotation axis (22) of the operating rod (2).
7. A high-reliability limit switch device, characterized in that: The invention comprises a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of interconnected contacts and at least two pairs of fixed contacts connected in parallel, the at least two pairs of fixed contacts correspond to the at least two pairs of interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of fixed contacts is not connected; The operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of interconnected contacts are respectively arranged on the connecting rod, so that the at least two pairs of interconnected contacts synchronously perform linear reciprocating motion with the rotation of the operating rod; The at least two pairs of fixed contacts are respectively arranged on the base and located in the linear movement direction of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of interconnected contacts in the at least two pairs of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of interconnected contacts is respectively in contact with or out of contact with the corresponding pair of fixed contacts one by one.
8. A high-reliability limit switch device, characterized in that: The invention comprises a switch core, an operating rod (2) and a base (3), wherein the switch core comprises at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts in parallel and at least two pairs of second fixed contacts in parallel, the at least two pairs of first fixed contacts correspond one-to-one to the at least two pairs of first interconnected contacts, the at least two pairs of second fixed contacts correspond one-to-one to the at least two pairs of second interconnected contacts, and each pair of fixed contacts in the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected; The at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the operating rod (2) and located on the rotating surface of the operating rod (2), so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts rotate synchronously with the rotation of the operating rod (2); The at least two pairs of first fixed contacts are respectively arranged on the base (3) and are also located on the rotating surface of the operating rod (2), so that when the operating rod (2) rotates clockwise to a first target position, each pair of first interconnected contacts in the at least two pairs of first interconnected contacts is in contact with a corresponding pair of fixed contacts one by one, and when the operating rod (2) rotates counterclockwise to a second target position, each pair of first interconnected contacts is out of contact with a corresponding pair of fixed contacts one by one; The at least two pairs of second fixed contacts are respectively arranged on the base (3) and are also located on the rotating surface of the operating rod (2), so that when the operating rod (2) rotates clockwise to the first target position, each pair of second interconnected contacts in the at least two pairs of second interconnected contacts is disengaged from the corresponding pair of fixed contacts one by one, and when the operating rod (2) rotates counterclockwise to the second target position, each pair of second interconnected contacts is in contact with the corresponding pair of fixed contacts one by one.
9. The high-reliability limit switch device according to claim 8, characterized in that: The first interconnection contact is arranged on the clockwise rotation side of the operating rod (2), and the second interconnection contact is arranged on the counterclockwise rotation side of the operating rod (2).
10. A high-reliability limit switch device, characterized in that: The invention comprises a switch core, an operating rod, a cam mechanism, a connecting rod and a base, wherein the switch core comprises at least two pairs of first interconnected contacts, at least two pairs of second interconnected contacts, at least two pairs of first fixed contacts in parallel and at least two pairs of second fixed contacts in parallel, the at least two pairs of first fixed contacts correspond to the at least two pairs of first interconnected contacts one by one, the at least two pairs of second fixed contacts correspond to the at least two pairs of second interconnected contacts one by one, and each pair of fixed contacts in the at least two pairs of first fixed contacts and the at least two pairs of second fixed contacts are not connected; The operating rod is connected to the connecting rod through the cam mechanism, and the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts are respectively arranged on the connecting rod, so that the at least two pairs of first interconnected contacts and the at least two pairs of second interconnected contacts synchronously perform linear reciprocating motion with the rotation of the operating rod; The at least two pairs of first fixed contacts are respectively arranged on the base and located in the linear movement advancing direction of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of first interconnected contacts in the at least two pairs of first interconnected contacts is respectively in contact with the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of first interconnected contacts is respectively out of contact with the corresponding pair of fixed contacts one by one; The at least two pairs of second fixed contacts are respectively arranged on the base and located in the linear movement backward direction of the at least two pairs of interconnected contacts, so that when the operating rod rotates clockwise to the first target position, each pair of second interconnected contacts in the at least two pairs of second interconnected contacts is disengaged from the corresponding pair of fixed contacts one by one, and when the operating rod rotates counterclockwise to the second target position, each pair of second interconnected contacts is contacted with the corresponding pair of fixed contacts one by one.