Electric switch detection device for safety tongs of speed governor

Abstract

The utility model relates to a speed governor safety tongs electrical switch detection device, which comprises a safety loop, a first power supply, a first switch, a speed governor switch, a safety tongs switch, a second switch and a loop tail end, and the loop tail end is used for outputting a safety signal for prompting that an elevator is in a normal operation state; the safety branch circuit comprises a first power supply, a test switch, and a first branch circuit and a second branch circuit which are coupled in sequence, wherein the first branch circuit and the second branch circuit are respectively connected with different switching gears; when the first branch circuit is electrified, the first switch and the second switch are both switched on; the second branch is coupled to the loop end; and the detection circuit is used for detecting the speed limiter switch and the safety tongs switch respectively when the first switch and the second switch are switched off. When the switch-on of the first branch circuit is switched to the switch-on of the second branch circuit, the output of a safety signal is kept at the tail end of the loop, the first switch and the second switch are both switched off, and the speed limiter switch and the safety tongs switch are jointly and completely cut off from the safety loop, so that the reliability of double insurance is conveniently detected.

Description

Technical Field

[0001] This application relates to the field of elevator safety technology, and in particular to a speed governor safety clamp electrical switch detection device. Background Technology

[0002] When an elevator is operating at excessive speed, the speed governor detects the car descending at excessive speed and activates the safety brake to bring the elevator to an emergency stop, providing necessary safety protection. The speed governor-activated safety brake activation involves both mechanical and electrical components, providing dual protection. This dual protection essentially means that the safety brake is controlled by electrical and mechanical conduction, respectively. Both the speed governor's electrical switch and the safety brake's electrical switch are normally closed contacts by default and are connected in series as part of a safety circuit. This means that, under default conditions, the safety circuit always outputs a safety signal indicating that the elevator can operate normally.

[0003] The electrical transmission process is as follows: the speed governor detects overspeed in the gearbox, the speed governor safety switch is activated, the electrical signal from the speed governor safety switch is transmitted to the safety gear electrical switch, the safety circuit is disconnected, the safety gear electrical switch is activated, the safety gear electrical switch is linked to the safety gear mechanical structure, and the safety gear mechanical structure brings the gearbox to an emergency stop.

[0004] The mechanical transmission process is a further supplement to the electrical transmission process. Its workflow is as follows: The speed governor detects overspeed in the calibration chamber. If the speed governor safety switch does not operate normally, or if the speed governor safety switch operates normally but the signal is not transmitted to the safety gear electrical switch, the safety gear electrical switch will not operate. The speed governor mechanical structure is then further triggered, and the speed governor mechanical transmission is transmitted to the safety gear mechanical structure. The safety gear immediately stops the calibration chamber, and the safety gear electrical switch is triggered by the safety gear mechanical structure.

[0005] Therefore, it can be seen that mechanical protection and electrical protection are essentially the same in their final performance. When the speed governor pulls up and the safety gear is effective, maintenance personnel cannot determine whether the speed governor switch and the safety gear switch have actually been activated, because the mechanical components have already stopped the car, and one of the electrical switches has been activated, disconnecting the safety circuit.

[0006] For maintenance personnel, regular maintenance inspections and tests of the speed governor and safety brake can easily overlook the transmission method from the speed governor electrical switch to the safety brake electrical switch. This means that while there may be both electrical and mechanical safety features, only the mechanical safety feature may actually be effective. In such cases, maintenance personnel must manually observe the operating status of the speed governor safety switch and whether the safety brake electrical switch is triggered synchronously during elevator inspections or routine maintenance.

[0007] Because the installation locations of safety clamps vary and the speed governor electrical switches of machine-room-less elevators are difficult to observe directly, maintenance personnel have difficulty visually observing the electrical conduction process and may easily overlook testing the electrical conduction method. This makes it difficult to determine whether the electrical conduction fuse in the double insurance is working, thus creating potential safety hazards. Utility Model Content

[0008] Therefore, it is necessary to provide a speed limiter safety clamp electrical switch detection device to address the aforementioned technical problems.

[0009] The speed limiter safety clamp electrical switch testing device of this application includes:

[0010] The safety circuit includes, in sequence, a first power supply, a first switch, a normally closed speed governor switch and a safety gear switch connected in series, a second switch, and a circuit end, wherein the circuit end is used to output a safety signal indicating that the elevator is in normal operating condition.

[0011] The safety branch includes, in sequence, the following: a first power supply, a switchable test switch, and a first branch and a second branch respectively connected to different switching positions; the first branch is configured to be on when energized, and off when energized, with both the first and second switches on; the second branch is coupled to the end of the circuit.

[0012] The detection circuit is used to detect the changes in the conduction state of the speed limiter switch and the safety brake switch when both the first switch and the second switch are open.

[0013] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0014] The detection circuit includes:

[0015] The first detection circuit includes the following components connected in series: the speed limiter switch, the first detector, the first normally closed switch, and the second normally closed switch, with the first normally closed switch and the second normally closed switch located at opposite ends of the speed limiter switch.

[0016] The second detection circuit includes the following components connected in series: the safety gear switch, the second detector, the third normally closed switch, and the fourth normally closed switch, with the third normally closed switch and the fourth normally closed switch located at opposite ends of the safety gear switch.

[0017] The first normally closed switch, the second normally closed switch, the third normally closed switch, and the fourth normally closed switch are configured to open when the first branch is energized and close otherwise.

[0018] Optionally, the first detection circuit and the second detection circuit share the same test power supply, and the first normally closed switch and the third normally closed switch are the same normally closed switch coupled to the test power supply.

[0019] Optionally, the first detector and the second detector are indicator lights.

[0020] Optionally, the safety branch includes a maintenance switch coupled between the first power supply and the test switch, the maintenance switch having a first position and a second position;

[0021] In the first gear position, the maintenance switch supplies power to the test switch;

[0022] In the second gear position, the test switch is de-energized, the detection switch is activated by the first temporary power supply, the first switch and the second switch are closed under the action of the first temporary power supply, and the output of the safety signal is maintained at the end of the circuit.

[0023] Optionally, an auxiliary branch is included, which includes: a first normally open switch and a second temporary power supply to be activated in sequence, wherein the second temporary power supply is configured to control the first switch and the second switch to close when energized;

[0024] When the first normally open switch is closed, the second temporary power supply is activated in conjunction with it. The first normally open switch is configured to close when the first branch is energized and open when it is de-energized.

[0025] Optionally, the auxiliary branch includes: a second normally open switch connected in parallel with the first normally open switch;

[0026] When the second normally open switch is closed, the second temporary power supply is activated in conjunction with it. The second normally open switch is configured to close when the first temporary power supply is energized and open when it is de-energized.

[0027] Optionally, both the first temporary power supply and the second temporary power supply are power supply coils.

[0028] Optionally, the detection circuit includes:

[0029] The first detection circuit includes the following components connected in series: the speed limiter switch, the first detector, the first normally closed switch, the second normally closed switch, the fifth normally closed switch, and the sixth normally closed switch. The first normally closed switch and the second normally closed switch are located at both ends of the speed limiter switch, and the fifth normally closed switch and the sixth normally closed switch are located at both ends of the speed limiter switch.

[0030] The second detection circuit includes the following components connected in series: the safety gear switch, the second detector, the third normally closed switch, the fourth normally closed switch, the seventh normally closed switch, and the eighth normally closed switch. The third normally closed switch and the fourth normally closed switch are located at both ends of the safety gear switch, and the seventh normally closed switch and the eighth normally closed switch are located at both ends of the safety gear switch.

[0031] The first normally closed switch, the second normally closed switch, the third normally closed switch and the fourth normally closed switch are configured to open when the second temporary power supply is energized, and close otherwise.

[0032] The fifth, sixth, seventh, and eighth normally closed switches are configured to be open when the first temporary power supply is energized, and closed otherwise.

[0033] Optionally, the first detection circuit and the second detection circuit share the same test power supply, the first normally closed switch and the third normally closed switch are the same normally closed switch coupled to the test power supply, and the fifth normally closed switch and the seventh normally closed switch are the same normally closed switch coupled to the test power supply.

[0034] The speed limiter safety clamp electrical switch detection device of this application has at least the following technical advantages:

[0035] (1) In the normal working state of the elevator, the first power supply is connected to the first branch through the test switch, the first branch is energized, the first switch and the second switch are both normally open switches, the first switch and the second switch are both turned on when the first branch is energized, and the safety circuit outputs a safety signal at the end of the circuit to maintain the normal operation of the elevator.

[0036] (2) When preparing for the governor-safety gear linkage test, switch the test switch from energizing the first branch to energizing the second branch. The first branch is de-energized, and both the first and second switches are disconnected. The governor switch and safety gear switch are completely disconnected from the safety circuit. Since the second branch is coupled to the end of the circuit, it replaces the original safety circuit, maintaining a safety signal output at the end of the circuit, allowing the elevator to operate normally for the governor-safety gear linkage test. At the start of the governor-safety gear linkage test, the elevator runs at overspeed. The detection circuit separately checks whether the governor switch and safety gear switch operate as expected, conveniently verifying the reliability of the double safety protection. Attached Figure Description

[0037] Figure 1 This is a circuit diagram of the safety circuit and safety branch in the electrical switch detection device for a speed limiter safety clamp according to an embodiment of this application;

[0038] Figure 2This is a circuit diagram of the safety circuit and safety branch in the electrical switch detection device for a speed limiter safety clamp according to an embodiment of this application;

[0039] Figure 3 This is a circuit diagram of the auxiliary branch in the electrical switch detection device for a speed limiter safety gear according to an embodiment of this application;

[0040] Figure 4 This is a circuit diagram of the first detection circuit in the speed limiter safety gear electrical switch detection device according to an embodiment of this application;

[0041] Figure 5 This is a circuit diagram of the second detection circuit in the speed limiter safety gear electrical switch detection device according to an embodiment of this application;

[0042] Figure 6 This is a circuit diagram of the detection circuit in the electrical switch detection device for a speed limiter safety clamp according to an embodiment of this application;

[0043] The annotations in the figure are explained as follows:

[0044] 100. Safety circuit; 101. First power supply; 110. First switch (E-NO1); 103. Speed ​​limiter switch (K1); 104. Safety gear switch (K2); 120. Second switch (E-NO2); 130. Circuit end;

[0045] 200, Safety branch; 210, Test switch (S1); 211, First branch; 212, Second branch;

[0046] 300. Detection circuit; 301. First detector (LED-A); 302. Second detector (LED-B); 303. Test power supply;

[0047] 310. First detection circuit; 311. First normally closed switch (INS-N1); 312. Second normally closed switch (INS-N2); 315. Fifth normally closed switch (TCI-N1); 316. Sixth normally closed switch (TCI-N2);

[0048] 320. Second detection circuit; 323. Third normally closed switch (INS-N1); 324. Fourth normally closed switch (INS-N3); 327. Seventh normally closed switch (TCI-N1); 328. Eighth normally closed switch (TCI-N3);

[0049] 400. Inspection switch (S2); 410. First temporary power supply (TCI);

[0050] 510. First normally open switch (INS-NO); 520. Second normally open switch (TCI-N0); 530. Second temporary power supply (E). Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0054] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this application, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a system, product, or device that includes a series of units is not necessarily limited to those units that are explicitly listed, but may include other units that are not explicitly listed or that are inherent to such products or devices.

[0056] The term "coupled" in this application means that when the first device and the second device are connected, the first device and the second device are not necessarily directly connected, but rather that there are an unlimited number of other devices between the first device and the second device, although they can also be directly connected.

[0057] The term "speed limiter switch and safety brake switch connected in series" in this application is not limited to the two being connected in a manner where the speed limiter switch comes first and the safety brake switch comes second; the order can also be reversed. Furthermore, the connection method is not limited to a direct connection; it is permissible for the speed limiter switch and safety brake switch to contain an unlimited number of other devices, and of course, a direct connection is also possible.

[0058] The term "detector" in this application refers to a circuit device capable of distinguishing whether a circuit is on or off, and the method of distinction includes physical information such as sound and light. For example, a detector may use an indicator light that indicates whether a circuit is on or off through the on / off light information.

[0059] The term "common series" in this application refers to a circuit series relationship in which the connection order of multiple devices is not limited.

[0060] One embodiment of this application provides a speed limiter safety clamp electrical switch detection device, including a safety circuit 100, a safety branch 200, and a detection circuit 300.

[0061] See Figure 1 The safety circuit 100 includes the following components coupled in sequence: a first power supply 101, a first switch 110, a normally closed speed limiter switch 103 and a safety clamp switch 104 connected in series, a second switch 120, and a circuit end 130. The circuit end 130 is used to output a safety signal indicating that the elevator is in normal operating condition.

[0062] The safety branch 200 includes, in sequence, a first power supply 101, a switchable test switch 210, and a first branch 211 and a second branch 212 connected to different switching positions. The first branch 211 is configured such that when energized, both the first switch 110 and the second switch 120 are on, and vice versa; that is, when the first branch 211 is de-energized, both the first switch 110 and the second switch 120 are off. The second branch 212 is coupled to the end of the loop 130.

[0063] The detection circuit 300 is used to detect the changes in the conduction state of the speed limiter switch 103 and the safety brake switch 104 when both the first switch 110 and the second switch 120 are open.

[0064] In this embodiment, when the elevator is operating normally, pin 1 of test switch 210 (S1) is turned on, and the first power supply 101 (e.g., 110V) is connected to the first branch 211 through test switch 210. The first branch 211 is energized. Both the first switch 110 and the second switch 120 are normally open switches. Both the first switch 110 and the second switch 120 are turned on, and the circuit end 130 of the safety circuit 100 outputs a safety signal to maintain the normal operation of the elevator.

[0065] When preparing to conduct the "speed governor-safety gear linkage test", the maintenance personnel switch the test switch 210 from energizing the first branch 211 to energizing the second branch 212. Pin 2 of test switch 210 (S1) is activated, and simultaneously, the first branch 211 is de-energized. Both the first switch 110 and the second switch 120 are disconnected, and the "speed governor switch 103 and safety gear switch 104, which are connected in series," are completely disconnected from the safety circuit 100. Since the second branch 212 is coupled to the circuit end 130, it replaces the original safety circuit 100, ensuring that the circuit end 130 maintains a safety signal output, allowing the elevator to operate normally for the "speed governor-safety gear linkage test".

[0066] The "speed governor-safety gear linkage test" begins, with the elevator running at overspeed. The detection circuit 300 checks whether the speed governor switch 103 and the safety gear switch 104 operate as expected, i.e., whether the speed governor switch 103 opens first, followed by the safety gear switch 104, and then the safety gear mechanical structure is triggered. If this process is not followed, it indicates a fault in the electrical conduction process and a failure in the double safety mechanism. Maintenance personnel should then inspect the circuit.

[0067] This embodiment designs a speed limiter safety gear electrical switch testing device to independently test the two electrical switches, speed limiter switch 103 and safety gear switch 104, thereby determining whether the speed limiter and safety gear electrical switches are truly functioning and reducing safety risks.

[0068] See Figure 2 and Figure 3 In some embodiments, the safety branch 200 includes a maintenance switch 400 coupled between the first power supply 101 and the test switch 210.

[0069] The maintenance switch 400 has a first position and a second position. In the first position, pin 1 of the maintenance switch 400 (S2) is closed, and the maintenance switch 400 supplies power to the test switch 210. In the second position, pin 2 of the maintenance switch 400 (S2) is closed, the test switch 210 is de-energized, the detection switch is activated, the first temporary power supply 410 is turned on, the first switch 110 and the second switch 120 are closed under the action of the first temporary power supply 410, and the circuit end 130 maintains the output of a safety signal.

[0070] Furthermore, the speed governor safety gear electrical switch detection device includes an auxiliary branch, which comprises: a first normally open switch 510 coupled in sequence, a second temporary power supply 530 to be activated by linkage, and a second normally open switch 520 connected in parallel to the first normally open switch 510. The second temporary power supply 530 is configured to control the closing of the first switch 110 and the second switch 120 when energized. The auxiliary branch includes a 24V power supply for the first normally open switch 510 and the second normally open switch 520.

[0071] When the first normally open switch 510 is closed, the second temporary power supply 530 is activated in conjunction with it. The first normally open switch 510 is configured to close when the first branch 211 is energized and open when it is de-energized.

[0072] When the second normally open switch 520 is closed, it activates the second temporary power supply 530. The second normally open switch 520 is configured to close when the first temporary power supply 410 is energized and open when it is de-energized. It can be understood that when the maintenance switch 400 is in its second position, it does not meet the prerequisites for performing the "speed limiter-safety gear linkage test." In other words, the maintenance switch 400 essentially provides two operating modes.

[0073] The first operating mode: With the maintenance switch 400 in the first position, the first auxiliary power supply is not activated, and the second normally open switch 520 remains open. The first normally open switch 510 is controlled by the first branch 211, specifically by the power supply coil INS of the first branch 211. When the power supply coil INS is energized, the first normally open switch 510 closes, and the second auxiliary power supply is activated in conjunction with the closed first normally open switch 510. The second auxiliary power supply then controls the first switch 110 and the second switch 120 to close. This is one way to implement the technical solution of "when the first branch 211 is energized, both the first switch 110 and the second switch 120 are turned on, and vice versa."

[0074] The second operating mode: When the maintenance switch 400 is in the second position, the first branch 211 cannot be energized through the test switch 210; specifically, the power supply coil INS cannot be energized through the first branch 211. Simultaneously, the first auxiliary power supply is activated by the conduction of the maintenance switch 400, and the second normally open switch 520 is closed under the control of the first auxiliary power supply. The second normally open switch 520 then activates the second auxiliary power supply, which directly acts on the first switch 110 and the second switch 120, maintaining the closure of both switches and ensuring the normal output of the safety circuit 100 signal.

[0075] Therefore, it can be seen that under the second working mode provided by the maintenance switch 400, the series of solutions of the speed governor safety gear electrical switch detection device have not been affected, and the elevator can be maintained normally.

[0076] In some embodiments, the detection circuit 300 includes different conduction branches that detect the conduction states of the speed limiter switch 103 and the safety brake switch 104, respectively.

[0077] See Figure 4 and Figure 5 In some embodiments, the detection circuit 300 includes a first detection circuit 310 and a second detection circuit 320.

[0078] See Figure 4The first detection circuit 310 includes the following components connected in series: speed limiter switch 103, first detector 301, first normally closed switch 311, second normally closed switch 312, fifth normally closed switch 315, and sixth normally closed switch 316. The first normally closed switch 311 and the second normally closed switch 312 are located at both ends of the speed limiter switch 103, and the fifth normally closed switch 315 and the sixth normally closed switch 316 are located at both ends of the speed limiter switch 103.

[0079] See Figure 4 The second detection circuit 320 includes the following components connected in series: safety gear switch 104, second detector 302, third normally closed switch 323, fourth normally closed switch 324, seventh normally closed switch 327, and eighth normally closed switch 328. The third normally closed switch 323 and the fourth normally closed switch 324 are located at both ends of the safety gear switch 104, and the seventh normally closed switch 327 and the eighth normally closed switch 328 are located at both ends of the safety gear switch 104.

[0080] The first normally closed switch 311, the second normally closed switch 312, the third normally closed switch 323 and the fourth normally closed switch 324 are configured to open when the first branch 211 is energized (when the second temporary power supply 530 is energized), and close when the first branch 211 is de-energized.

[0081] The fifth normally closed switch 315, the sixth normally closed switch 316, the seventh normally closed switch 327 and the eighth normally closed switch 328 are configured to be open when the first temporary power supply 410 is energized, and closed when the first temporary power supply 410 is de-energized.

[0082] The detection circuit 300 provided in this embodiment does not require additional switching equipment. Specifically:

[0083] When the maintenance switch 400 is in the first position, it supplies power to the test switch 210. If the first branch 211 is closed, the first normally closed switch 311, the second normally closed switch 312, the third normally closed switch 323, and the fourth normally closed switch 324 are all open, preventing current from the detection circuit 300 from entering the speed limiter switch 103 and the safety gear switch 104, thus causing no impact. If the second branch 212 is closed, the "speed limiter-safety gear linkage test" is prepared, and as mentioned above, the "speed limiter switch 103 and safety gear switch 104 connected in series" are completely disconnected from the safety circuit 100. If the first branch 211 is de-energized, the first normally closed switch 311, the second normally closed switch 312, the third normally closed switch 323, and the fourth normally closed switch 324 are all closed, allowing the "speed limiter-safety gear linkage test" to proceed normally.

[0084] When the maintenance switch 400 is in the second position, the first branch 211 is de-energized, and the first auxiliary power supply is energized. The second normally closed switch 312, the third normally closed switch 323, and the fourth normally closed switch 324 are all closed. Since the fifth normally closed switch 315, the sixth normally closed switch 316, the seventh normally closed switch 327, and the eighth normally closed switch 328 are all normally closed, the first auxiliary power supply switches them to the open state after being energized. Therefore, the current from the detection circuit 300 cannot enter the speed limiter switch 103 and the safety brake switch 104, causing no impact.

[0085] See Figure 6 In some embodiments, the first detection circuit 310 and the second detection circuit 320 share the same test power supply 303 (e.g., 24V), the first normally closed switch 311 and the third normally closed switch 323 are the same normally closed switch coupled to the test power supply 303, and the fifth normally closed switch 315 and the seventh normally closed switch 327 are the same normally closed switch coupled to the test power supply 303.

[0086] See Figures 4-6 The circuit diagram further details the working process of each embodiment of this application: First, under normal conditions, the INS coil is energized, the normally open contact of INS-NO in the auxiliary branch is closed, coil E is energized, E-NO1 and E-NO2 are in the closed state, and safety circuit 100 is conductive. The detection circuit is disconnected and no detection is performed. Second, during elevator testing, when entering emergency electric mode, INS is de-energized, E-NO1 and E-NO2 are disconnected, and the detection mode is entered. Indicator lights 1 (LEDA) and 2 (LEDB) are lit. At this time, the switch is in the normal state. During the speed limiter safety clamp linkage test:

[0087] (1) Indicator lights 1 and 2 change from always on to always off due to the state change of the switch, thus confirming that the switches are effective.

[0088] (2) If indicator light 1 is on and indicator light 2 is off, it means that speed limiter switch 103 is malfunctioning.

[0089] (3) If indicator light 1 is off and indicator light 2 is on, it means that safety clamp switch 104 is malfunctioning.

[0090] (4) If both indicator lights 1 and indicator lights 2 are on, then there is a problem with both switches.

[0091] The designs of the various embodiments of this application can directly determine the switch status during testing, improving efficiency and safety. When the elevator maintenance switch 400 is switched to the second position and the elevator is in maintenance mode, the detection circuit will not affect the normal maintenance operation of the elevator. At this time, the TCI coil is energized, the normally open contact of TCI-NO in the auxiliary branch is closed, the coil E is energized, the safety circuit 100 returns to normal, and the detection circuit is disconnected. The detection mode of "speed limiter-safety clamp linkage test" is exited.

[0092] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0093] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A device for detecting the electrical opening of a speed limiter safety gear, characterized in that, The application relates to a safety circuit, comprising: a main circuit, comprising a first power supply, a first switch, a speed limiter switch and a safety gear switch connected in series, a second switch, and a circuit end for outputting a safety signal indicating that the elevator is in normal operation; a safety branch circuit, comprising the first power supply, a test switch with switchable gears, a first branch circuit and a second branch circuit connected to different gears respectively; when the first branch circuit is powered, the first switch and the second switch are configured to be both on or both off; the second branch circuit is connected to the circuit end; a detection circuit for detecting the on-off state of the speed limiter switch and the safety gear switch when the first switch and the second switch are both off. The detection circuit comprises: a first detection circuit, comprising the speed limiter switch, a first detector, a first normally closed switch and a second normally closed switch connected in series; a second detection circuit, comprising the safety gear switch, a second detector, a third normally closed switch and a fourth normally closed switch connected in series; the first normally closed switch, the second normally closed switch, the third normally closed switch and the fourth normally closed switch are configured to be both off when the first branch circuit is powered or both on when the first branch circuit is not powered. The first detection circuit and the second detection circuit share the same test power supply, and the first normally closed switch and the third normally closed switch are the same normally closed switch connected to the test power supply. The first detector and the second detector are indicator lights.

2. The electric switch detection device for a speed limiter safety gear according to claim 1, wherein The safety branch circuit comprises a maintenance switch connected between the first power supply and the test switch, and the maintenance switch has a first gear and a second gear; in the first gear state, the maintenance switch supplies power to the test switch; in the second gear state, the test switch loses power, the detection switch is actuated to turn on a first temporary power supply, the first switch and the second switch are closed under the action of the first temporary power supply, and the circuit end keeps outputting the safety signal. The safety circuit comprises an auxiliary branch circuit, which comprises a first normally open switch and a second temporary power supply to be actuated to turn on; when the second temporary power supply is powered, the first switch and the second switch are configured to be closed; when the first normally open switch is closed, the second temporary power supply is actuated to turn on; the first normally open switch is configured to be closed when the first branch circuit is powered or opened when the first branch circuit loses power. The auxiliary branch circuit comprises a second normally open switch connected in parallel with the first normally open switch; when the second normally open switch is closed, the second temporary power supply is actuated to turn on; the second normally open switch is configured to be closed when the first temporary power supply is powered or opened when the first temporary power supply loses power. The first temporary power supply and the second temporary power supply are both power supply coils.

3. The electric switch detection device for a speed limiter safety gear according to claim 2, wherein The detection circuit comprises:

4. The electric switch detection device for a speed limiter safety gear according to claim 2, wherein ​ 5. The electric switch detection device for a speed limiter safety gear according to claim 1, wherein ​ ​ ​ 6. The electric switch detector for a speed limiter safety gear as set forth in claim 5, characterized by ​ ​ 7. The electric switch detector for a speed limiter safety gear as set forth in claim 6, characterized by ​ ​ 8. The electric switch detector for a speed limiter safety gear as set forth in claim 7, wherein ​ 9. The electric switch detector for a speed limiter safety gear as set forth in claim 7, wherein ​ The first detection circuit comprises, in common series connection: the speed limiter switch, a first detector, a first normally closed switch, a second normally closed switch, a fifth normally closed switch and a sixth normally closed switch, the first and second normally closed switches being across the speed limiter switch, the fifth and sixth normally closed switches being across the speed limiter switch; The second detection circuit comprises, in common series connection: the safety clutch switch, a second detector, a third normally closed switch, a fourth normally closed switch, a seventh normally closed switch and an eighth normally closed switch, the third and fourth normally closed switches being across the safety clutch switch, the seventh and eighth normally closed switches being across the safety clutch switch; The first and second normally closed switches and the third and fourth normally closed switches are configured to be open when the second temporary power source is powered, and to be closed otherwise; The fifth and sixth normally closed switches and the seventh and eighth normally closed switches are configured to be open when the first temporary power source is powered, and to be closed otherwise.

10. The electric switch detector for a speed limiter safety gear as set forth in claim 9, wherein The first detection circuit and the second detection circuit share a same test power source, the first and third normally closed switches are a same normally closed switch coupled to the test power source, and the fifth and seventh normally closed switches are a same normally closed switch coupled to the test power source.

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