Passive travel switch with verification function and use method thereof

Abstract

The invention provides a passive travel switch with a verification function and a use method thereof, the travel switch comprises a verification operation button S1 and a first normally open contact, the first normally open contact is closed when the travel switch is triggered by an external force, and two ends of the first normally open contact are respectively connected to wiring terminals 11 and 14. The two ends of the first normally open contact are connected in parallel with a passive verification circuit, the passive verification circuit structurally comprises a second normally closed contact, an LED lamp, a second normally open contact and a second normally closed contact which are sequentially connected in series, and the two ends of the LED lamp and the two ends of the second normally open contact are connected in parallel with a capacitor C1; the first normally-open contact, the second normally-closed contact, the second normally-open contact and the second normally-closed contact change the contact connection state when the inspection operation button S1 is pressed down and reset when the inspection operation button S1 is loosened. According to the invention, the function of the travel switch is expanded, and the verification difficulty is reduced; compared with the existing device and method for verifying the in-place action of the travel switch by using an indicating lamp, an indicating lamp power supply does not need to be additionally added, and the economical efficiency and usability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary equipment of hydro-generators, and in particular to a passive travel switch with a calibration function and a use method thereof. Background Art

[0002] A limit switch is a device used to detect the position or motion of an object, often used for limit control or position feedback in mechanical equipment. When a mechanical component moves to a specific position, the limit switch is triggered, changing the circuit state to implement a control or protection function. Because the normally open and normally closed contacts of a limit switch are typically located within the device, verifying the health of the contacts is difficult.

[0003] There are technologies in the prior art for indicating the health or status of a travel switch. For example, Chinese patent document CN115148517A discloses a travel switch with a light display, comprising a housing, a housing cover connected to the front of the housing by bolts, a through hole provided in the middle of the top of the housing cover, a rotating rod movably connected to the inner cavity of the through hole, and a crank arm connected to one end of the rotating rod by screws, the crank arm being located on the outer side of the housing. The travel switch with a light display provided in the present application has a second contact and a second fixed contact. The crank arm drives a rotating disk to rotate during rotation, and the rotating disk drives a push rod to move via a connecting rod, and the push rod drives a connecting block to move in a vertical direction. When contact 1 at the bottom of the connecting block contacts fixed contact 1 at the top of the movable plate, contact 2 and fixed contact 2 also contact each other. At this time, the circuit where the indicator light is located is in a closed state. The bright light emitted by the indicator light can remind the staff that the switch has been moved into place, making it easier for the staff to inspect and repair the switch.

[0004] Patent document CN114256009A discloses a travel switch and detection method for wind brake braking detection of a turbine unit, wherein a telescopic rod slides in contact with the inside of the travel switch and extends into an inner groove of the shell, and a rod limit block is provided on the upper wall of the inner groove of the shell, and a trigger boss is provided at the lower end of the rod limit block, and a position detection switch group is provided on one side of the trigger boss, and a position indicator light group is provided on the travel switch shell. A plurality of travel switches are provided in the position detection switch group, and the position detection switch group corresponds one-to-one with the indicator lights in the position indicator light group to form a series circuit. By arranging multiple position detection switches on the travel switch and detecting the switches through the boss structure, the switches and the indicator lights on the shell form an indication circuit, which can intuitively display the status of the wind brake braking distance and send the status to the control system. The wind brake braking command signal and the change of the switch are detected by the switch detection control panel, and the switch fault can be self-detected and output the result of wind brake braking or resetting.

[0005] Both of the above patents disclose devices and methods for checking the position of travel switches using indicator lights, but both require an external power supply. As a common industrial control hardware, travel switches must be stable, easy to use, and economical. Patent 1 has a complex transmission method that is prone to damage. Patent 2 not only requires a large number of LED lights, but also adds a control board, which is not economical. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a passive travel switch with a calibration function and a method of using the same, so as to solve the problem that the existing travel switch is difficult to calibrate while ensuring reliability, ease of use and economy.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A passive travel switch with a verification function, the travel switch comprises a verification operation button S and a first normally open contact, the first normally open contact closes when the travel switch is triggered by an external force, the two ends of the first normally open contact (1) are respectively connected to the connection terminals 11 and 14, a passive verification circuit is connected in parallel to the two ends of the first normally open contact, and the passive verification circuit structure is as follows: It includes a second normally closed contact, an LED lamp, a second normally open contact, and a second normally closed contact connected in series in sequence, wherein a capacitor C is connected in parallel between the LED lamp and the second normally open contact; The first normally open contact, the second normally closed contact, the second normally open contact and the second normally closed contact change the contact connection state when the inspection operation button S1 is pressed and the contacts are reset when the inspection operation button S1 is released.

[0008] Preferably, the above-mentioned test operation button S1 is provided with a linked power generation device, which generates electrical energy when the test operation button S1 is pressed, and the power generation device is connected in parallel to both ends of the capacitor C1.

[0009] Preferably, the power generation device is a piezoelectric generator or an electromagnetic induction coil. When the inspection operation button S1 is pressed, the power generation device converts kinetic energy into electrical energy to charge the capacitor C1.

[0010] Preferably, a buzzer is connected in parallel at both ends of the LED lamp.

[0011] Preferably, the capacitor C1 is connected in series with the inductor L1, and both ends of the capacitor C1 and the inductor L1 are connected in parallel to both ends of the LED lamp and the second normally open contact.

[0012] Preferably, the capacitor C1 and the inductor L1 are electrically connected to a rectifier, and an output end of the rectifier is connected to the LED lamp and two ends of the second normally open contact.

[0013] Preferably, the above-mentioned first normally open contact, second normally closed contact, second normally open contact and second normally closed contact are provided with an interlocked inspection control coil, and terminals A1 and A2 are provided at both ends of the inspection control coil. When terminals A1 and A2 are connected to the power supply, the inspection control coil is energized so that the first normally open contact, second normally closed contact, second normally open contact and second normally closed contact are interlocked to change the working state.

[0014] Preferably, the above-mentioned first normally open contact changes state by the reciprocating motion of the trigger rod, a switch boss and a reset spring in contact with the switch boss are provided at the bottom end of the trigger rod, a test boss is provided on the trigger rod, a test pressure ring is provided on the test boss and surrounds the trigger rod body, a test lever that can be reciprocated is provided on one side of the test pressure ring, and a test connecting rod is provided on the other side of the test pressure ring. The second normally closed contact, the second normally open contact and the second normally closed contact change state by the reciprocating motion of the test connecting rod, a verification boss and a test spring in contact with the verification boss are provided below the test connecting rod, and the test lever is the operating actuator for checking the operation button S1.

[0015] Preferably, the test connecting rod is made of ferromagnetic material, and the tail end of the test connecting rod passes through the inspection control coil.

[0016] The method for using the above-mentioned passive travel switch with calibration function is as follows: S1. Installation and deployment of the travel switch: Install the travel switch to the location to be monitored, and connect its contacts 11 and 14 to the control circuit to complete the deployment; S2, capacitor charging: When there is a potential difference between contacts 11 and 14 and the operation button S1 is checked without mechanical collision, the capacitor can be charged; S3, mechanical collision signal output: when the operation button S1 is checked and there is no mechanical collision, contacts 11 and 14 are connected to output an electrical signal, and at the same time, when the capacitor C1 stores electrical energy, the LED light (5) will not light up; S4. Contact verification: Press the inspection operation button S1 manually. If the LED light is on, it is determined that the travel switch contacts are normal. If the LED light is not on, briefly connect the external power supply to contacts 11 and 14, and press the travel switch operating head S1 again. If the LED light is on, it is determined that the travel switch contacts are normal, otherwise the contacts are damaged.

[0017] The present invention provides a passive limit switch with a calibration function and a method for using the same, which expands the function of the limit switch and reduces the difficulty of calibration. Compared with the existing device and method for calibrating the position of the limit switch using an indicator light, there is no need to add an additional power supply for the indicator light, which increases economy and ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples: Figure 1 This is an electrical schematic diagram of a passive travel switch with a calibration function according to the present invention; Figure 2 Schematic diagram of the structure of the inspection operation button S1 and the travel switch preferably of the present invention; Figure 3 This is the electrical schematic diagram of the preferred solution 1, which is a passive travel switch with a power generation device and a calibration function; Figure 4 This is the electrical schematic diagram of the preferred solution 2, which is a passive limit switch with a buzzer and a calibration function; Figure 5 This is the electrical schematic diagram of the preferred solution 3, a passive travel switch with an inductor and a calibration function; Figure 6 This is the electrical schematic diagram of the preferred solution 4, which is a passive travel switch with a rectifier device and a calibration function; Figure 7 This is the electrical schematic diagram of the preferred solution 5, which has a passive travel switch with automatic calibration function; Figure 8 This is a schematic diagram of the structure of the inspection operation button S1 and the travel switch of the preferred solution 5.

[0019] In the figure: inspection operation button S1, first normally open contact 1, second normally closed contact 2, second normally open contact 3, second normally closed contact 4, LED lamp 5, capacitor C1, generator 6, buzzer 7, inductor L1, rectifier device 8, inspection control coil 9, trigger rod 10, test lever 12, test boss 13, return spring 15, test pressure ring 16, switch boss 17, test connecting rod 18, test spring 19, and verification boss 20. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0021] A passive travel switch with a verification function includes a verification operation button S1 and a first normally open contact 1. The first normally open contact 1 closes when the travel switch is triggered by an external force. The two ends of the first normally open contact 1 are respectively connected to the connection terminals 11 and 14. A passive verification circuit is connected in parallel at both ends of the first normally open contact 1. The passive verification circuit structure is as follows: It includes a second normally closed contact 2, an LED lamp 5, a second normally open contact 3 and a second normally closed contact 4 connected in series in sequence, and a capacitor C1 is connected in parallel across the LED lamp 5 and the second normally open contact 3; The first normally open contact 1, the second normally closed contact 2, the second normally open contact 3 and the second normally closed contact 4 change the contact connection state when the inspection operation button S1 is pressed and reset when the inspection operation button S1 is released.

[0022] like Figure 1 As shown in , when the limit switch is not triggered, the capacitor C1 uses the potential difference between the terminals 11 and 14 to store energy. When the inspection operation button S1 is pressed, the contact connection state of the first normally open contact 1, the second normally closed contact 2, the second normally open contact 3 and the second normally closed contact 4 changes, so that the LED lamp 5 and the capacitor C1 form a loop, and the capacitor C1 releases electrical energy to light up the LED lamp 5; the circuit structure changes by changing the linkage contact state, and whether the limit switch contacts are normally damaged is judged by whether the LED lamp 5 is lit. Figure 1 In the example, the first normally open contact 1 is the contact in operation, and the second normally closed contact 2, the second normally open contact 3 and the second normally closed contact 4 cooperate to verify the first normally open contact 1 while also completing their own verification.

[0023] Preferably, the above-mentioned test operation button S1 is provided with a linked power generation device 6. The power generation device 6 generates electric energy when the test operation button S1 is pressed. The power generation device 6 is connected in parallel to both ends of the capacitor C1.

[0024] Preferably, the power generation device 6 is a piezoelectric generator or an electromagnetic induction coil. When the inspection operation button S1 is pressed, the power generation device 6 converts kinetic energy into electrical energy to charge the capacitor C1.

[0025] like Figure 1 The test structure in the need to rely on the potential difference between the terminals 11 and 14, in a sense it is an active test, and according to Figure 2 In the circuit structure, a linked power generation device 6 is set on the inspection operation button S1. The power generation device 6 is a piezoelectric generator or an electromagnetic induction coil. The piezoelectric generator can be made of piezoelectric ceramics, etc., which is similar to the ignition device of a lighter. When the inspection operation button S1 is actuated, the power generation device 6 generates electrical energy, and the capacitor C1 is charged. After the charging is completed, the electrical energy is transferred to the LED lamp 5. The LED lamp 5 is on, indicating that it is working normally. Preferably, a buzzer 7 is connected in parallel at both ends of the LED lamp 5 .

[0026] like Figure 4 As shown in , in addition to visually judging the quality of the product through the LED, the quality of the product can also be judged by whether the buzzer beeps.

[0027] Preferably, the capacitor C1 is connected in series with the inductor L1 , and both ends of the capacitor C1 and the inductor L1 are connected in parallel to both ends of the LED lamp 5 and the second normally open contact 3 .

[0028] like Figure 5As shown in FIG, the inductor L1 is added to prevent the capacitor C1 from being broken down due to excessive instantaneous current or voltage when the generator 6 is charging the capacitor C1, and to prevent the LED lamp 5 and the inductor L1 from being damaged due to excessive instantaneous current when the capacitor C1 is discharging; at the same time, the inductor L1 itself also serves as an energy storage element.

[0029] Preferably, the capacitor C1 and the inductor L1 are electrically connected to the rectifier 8 , and the output end of the rectifier 8 is connected to both ends of the LED lamp 5 and the second normally open contact 3 .

[0030] like Figure 6 As shown in the figure, the capacitor C1 and the inductor L1 output DC power through the rectifier 8, which then provides more stable DC power for the LED lamp and the buzzer, and reduces the impact of discharge on the LED lamp and the buzzer. The rectifier 8 can use a diode rectifier as shown in the figure.

[0031] Preferably, the above-mentioned first normally open contact 1, second normally closed contact 2, second normally open contact 3 and second normally closed contact 4 are provided with an interlocked inspection control coil 9, and terminals A1 and A2 are provided at both ends of the inspection control coil 9. When terminals A1 and A2 are connected to the power supply, the inspection control coil 9 is energized so that the first normally open contact 1, the second normally closed contact 2, the second normally open contact 3 and the second normally closed contact 4 are interlocked to change the working state.

[0032] like Figure 7 As shown in the figure, the inspection control coil 9 and its terminals A1 and A2 are control contacts for automatically checking the travel switch. The controller controls the power on and off of the inspection control coil 9, changes the state of the contacts, and thus triggers the passive verification circuit under a controlled state. By detecting whether the on and off conditions of the terminals 11 and 14 are the same as the state that the control signal should be, it is determined whether the travel switch is damaged through control.

[0033] Preferably, the above-mentioned first normally open contact 1 is changed in state by the reciprocating motion of the trigger rod 10, and a switch boss 17 and a reset spring 15 in contact with the switch boss 17 are provided at the bottom end of the trigger rod 10. A test boss 13 is provided on the trigger rod 10, and a test pressure ring 16 surrounding the rod body of the trigger rod 10 is provided on the test boss 13. A test lever 12 that can be reciprocated is provided on one side of the test pressure ring 16, and a test connecting rod 18 is provided on the other side of the test pressure ring 16. The second normally closed contact 2, the second normally open contact 3 and the second normally closed contact 4 are changed in state by the reciprocating motion of the test connecting rod 18. A verification boss 20 and a test spring 19 in contact with the verification boss 20 are provided below the test connecting rod 18. The test lever 12 is the operating actuator for checking the operation button S1.

[0034] like Figure 2As shown in FIG, the second normally closed contact 2, the second normally open contact 3, and the second normally closed contact 4 are all on the test link 18 and are not shown. When the test operation button S1 is pressed downward, the states of the first normally open contact 1, the second normally closed contact 2, the second normally open contact 3, and the second normally closed contact 4 all change; and when the trigger member of the limit switch, i.e., the trigger rod 10, is triggered downward, only the first normally open contact 1 is actuated. This structure is suitable for forming a switch with only one pair of main contacts, i.e., the first normally open contact 1, or the other contacts of the limit switch no longer participate in the verification circuit. If the first normally open contact 1 is judged to be working normally, it means that the trigger rod 10 is moving normally, and the other contacts are also working normally. The second normally closed contact 2, the second normally open contact 3, and the second normally closed contact 4 no longer move with each movement of the trigger rod 10. Therefore, the standard requirements for the normal reciprocating operation of the second normally closed contact 2, the second normally open contact 3, and the second normally closed contact 4 are greatly reduced, and switches participating in the verification circuit can use switches with lower requirements.

[0035] Preferably, the test connecting rod 18 is made of ferromagnetic material, and the tail end of the test connecting rod 18 passes through the inspection control coil 9 .

[0036] The energization of the inspection control coil 9 replaces the operation of pressing the inspection operation button S1, and the manual inspection can be replaced by the automatic control program inspection.

[0037] The method for using the above-mentioned passive travel switch with calibration function is as follows: S1. Installation and deployment of the travel switch: Install the travel switch at the location to be monitored, and connect its contacts 11 and 14 to the control circuit, such as the PLC signal acquisition circuit or the door control light circuit, to complete the deployment of this device; S2, capacitor charging: When there is a potential difference between contacts 11 and 14 and the operation button S1 is checked without mechanical collision, the capacitor can be charged; S3, mechanical collision signal output: When the operation button S1 is not mechanically impacted, contacts 11 and 14 are connected to output an electrical signal. At the same time, the LED light 5 will not light up when the capacitor C1 stores electrical energy. S4. Contact verification: Press the inspection operation button S1 manually. If the LED light 5 lights up, the limit switch contacts are normal. If the LED light 5 is not on, briefly connect the external power supply to contacts 11 and 14, and press the limit switch operating head S1 again. If the LED light 5 lights up, the limit switch contacts are normal, otherwise the contacts are damaged.

Claims

1. A passive travel switch with a calibration function, characterized in that: The travel switch comprises a check operation button S1 and a first normally open contact (1). The first normally open contact (1) is closed when the travel switch is triggered by an external force. Both ends of the first normally open contact (1) are connected to the connection terminals 11 and 14 respectively. A passive check circuit is connected in parallel to both ends of the first normally open contact (1). The passive check circuit structure is as follows: It comprises a second normally closed contact (2), an LED lamp (5), a second normally open contact (3), and a second normally closed contact (4) connected in series, wherein a capacitor C1 is connected in parallel at both ends of the LED lamp (5) and the second normally open contact (3); The first normally open contact (1), the second normally closed contact (2), the second normally open contact (3) and the second normally closed contact (4) change the contact connection state when the test operation button S1 is pressed and reset when the test operation button S1 is released.

2. A passive travel switch with a calibration function according to claim 1, characterized in that: The inspection operation button S1 is provided with a linked power generation device (6). The power generation device (6) generates electric energy when the inspection operation button S1 is pressed. The power generation device (6) is connected in parallel to both ends of the capacitor C1.

3. A passive travel switch with a calibration function according to claim 2, characterized in that: The power generation device (6) is a piezoelectric generator or an electromagnetic induction coil. When the inspection operation button S1 is pressed, the power generation device (6) converts kinetic energy into electrical energy to charge the capacitor C1.

4. A passive travel switch with a calibration function according to claim 3, characterized in that: A buzzer (7) is connected in parallel to both ends of the LED lamp (5).

5. A passive travel switch with a calibration function according to claim 4, characterized in that: The capacitor C1 is connected in series with the inductor L1, and both ends of the capacitor C1 and the inductor L1 are connected in parallel to both ends of the LED lamp (5) and the second normally open contact (3).

6. A passive travel switch with a calibration function according to claim 5, characterized in that: The capacitor C1 and the inductor L1 are electrically connected to the rectifier (8), and the output end of the rectifier (8) is connected to the LED lamp (5) and the second normally open contact (3).

7. A passive travel switch with a calibration function according to claim 6, characterized in that: The first normally open contact (1), the second normally closed contact (2), the second normally open contact (3) and the second normally closed contact (4) are provided with a linked inspection control coil (9), and terminals A1 and A2 are provided at both ends of the inspection control coil (9). When terminals A1 and A2 are connected to a power supply, the inspection control coil (9) is energized, causing the first normally open contact (1), the second normally closed contact (2), the second normally open contact (3) and the second normally closed contact (4) to change their working states in a linked manner.

8. The passive travel switch with a calibration function according to claim 7, characterized in that: The first normally open contact (1) is changed in state by the reciprocating motion of the trigger rod (10), the bottom end of the trigger rod (10) is provided with a switch boss (17) and a return spring (15) in contact with the switch boss (17), the trigger rod (10) is provided with a test boss (13), the test boss (13) is provided with a test pressure ring (16) surrounding the rod body of the trigger rod (10), one side of the test pressure ring (16) is provided with a reciprocating test lever (12), and the other side of the test pressure ring (16) is provided with a test connecting rod (18), the second normally closed contact (2), the second normally open contact (3) and the second normally closed contact (4) are changed in state by the reciprocating motion of the test connecting rod (18), the lower part of the test connecting rod (18) is provided with a check boss (20) and a test spring (19) in contact with the check boss (20), and the test connecting rod (12) is an operating actuator for checking the operation button S1.

9. The passive travel switch with a calibration function according to claim 8, characterized in that: The test connecting rod (18) is made of ferromagnetic material, and the tail end of the test connecting rod (18) passes through the inspection control coil (9).

10. A method for using the passive travel switch with a calibration function according to claim 8, characterized in that: The steps used are: S1. Installation and deployment of the travel switch: Install the travel switch to the location to be monitored, and connect its contacts 11 and 14 to the control circuit to complete the deployment; S2, capacitor charging: When there is a potential difference between contacts 11 and 14 and the operation button S1 is checked without mechanical collision, the capacitor can be charged; S3, mechanical collision signal output: when the operation button S1 is checked and there is no mechanical collision, contacts 11 and 14 are connected to output an electrical signal, and at the same time, when the capacitor C1 stores electrical energy, the LED light (5) will not light up; S4, contact check: manually press the check operation button S1. If the LED light (5) lights up, it is determined that the limit switch contacts are normal. In the case that the LED light (5) is not lit, briefly connect the external power supply to the 11 and 14 contacts, and press the limit switch operating head (S1) again. If the LED light (5) lights up, it is determined that the limit switch contacts are normal, otherwise the contacts are damaged.

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