A safety circuit for elevator travel reduction function

Abstract

An elevator stroke reduction function safety circuit belongs to the field of elevator safety technology. It includes a position monitoring circuit, a speed monitoring circuit, a logic judgment circuit, a stroke reduction action feedback circuit, an adhesion feedback circuit and a stroke reduction action protection circuit. The position monitoring circuit, the speed monitoring circuit and the logic judgment circuit are respectively connected to the stroke reduction action protection circuit, the stroke reduction action feedback circuit is respectively connected to the position monitoring circuit and the speed monitoring circuit, and the adhesion feedback circuit is connected to the logic judgment circuit. Advantages: It can avoid the phenomenon of the elevator rushing to the top or squatting to the bottom in the case of abnormal parking, and improve the stability and safety of the elevator.

Description

Technical Field

[0001] The invention belongs to the technical field of elevator safety, and in particular relates to a safety circuit for an elevator stroke reduction function. Background Art

[0002] The rapid growth of my country's economic construction has brought unprecedented opportunities to the elevator industry. As an important type of elevator, the inclined passenger elevator can realize the free connection of any two points in the three-dimensional space. For example, for large transfer stations with complex structures of rail transportation (subway, high-speed rail, etc.), it can solve the transportation problems under complex conditions and improve the efficiency of passenger diversion. Due to its good safety, high reliability, large load capacity, low failure rate and low noise, the inclined passenger elevator has a high market share in the entire elevator market, especially in developed areas of Europe and the United States. With the continuous advancement of urban construction, many buildings are currently built on slopes, so there is a great demand for new inclined passenger elevators that can be inclined at a certain angle.

[0003] At present, the new type of inclined passenger elevator (hereinafter referred to as "inclined elevator") is in its infancy in China, and there are very few manufacturers capable of designing and producing it. Even if a few manufacturers are capable of producing inclined elevators, they have brought many problems due to unstable product performance and relatively complex structure. Especially when the inclined elevator adopts a front door structure, when the car runs to the leveling position of the upper and lower end stations, the buffer stroke is basically completely compressed by the car, and at this time the limit and limit switches still do not work normally, which can easily cause the elevator to hit the top or squat at the bottom in the case of abnormal parking.

[0004] In view of the above-mentioned prior art, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0005] The object of the present invention is to provide a safety circuit for an elevator stroke reduction function capable of achieving elevator terminal station deceleration.

[0006] The objective of the present invention is achieved by providing an elevator stroke reduction function safety circuit, characterized in that it includes a position monitoring circuit, a speed monitoring circuit, a logic judgment circuit, a stroke reduction action feedback circuit, an adhesion feedback circuit and a stroke reduction action protection circuit, wherein the position monitoring circuit, the speed monitoring circuit and the logic judgment circuit are respectively connected to the stroke reduction action protection circuit, the stroke reduction action feedback circuit is respectively connected to the position monitoring circuit and the speed monitoring circuit, and the adhesion feedback circuit is connected to the logic judgment circuit.

[0007] In a specific embodiment of the present invention, the position monitoring circuit includes a coil of a first position detection relay K1, a coil of a second position detection relay K2, a first normally open contact K1-a of the first position detection relay K1, a first normally open contact K2-a of the second position detection relay K2, a first normally open contact TJ-a of a position logic judgment relay TJ, a second normally open contact TJ-b, a first diode D1, a second diode D2, a seventh diode D7, an eighth diode D8, a first light-emitting diode L7, a second light-emitting diode L8, a first resistor R1 and a second resistor R2, the cathode of the first diode D1 is connected to a shaft position switch of an elevator, the anode of the first diode D1 is connected to one end of the first normally open contact K1-a of the first position detection relay K1 and one end of the first normally open contact TJ-a of the position logic judgment relay TJ, the other end of the first normally open contact K1-a of the first position detection relay K1 and the other end of the first normally open contact TJ-a of the position logic judgment relay TJ are connected to the anode of the seventh diode D7, the first position detection relay K1 One end of the coil of the second position detection relay K2 and one end of the first resistor R1 are connected, the other end of the first resistor R1 is connected to the cathode of the first light-emitting diode L7, the cathode of the second diode D2 is connected to another shaft position switch of the elevator, the anode of the second diode D2 is connected to one end of the first normally open contact K2-a of the second position detection relay K2 and one end of the second normally open contact TJ-b of the position logic judgment relay TJ, the other end of the first normally open contact K2-a of the second position detection relay K2 and the other end of the second normally open contact TJ-b of the position logic judgment relay TJ are commonly connected to the anode of the eighth diode D8, one end of the coil of the second position detection relay K2 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the cathode of the second light-emitting diode L8, the cathode of the seventh diode D7, the other end of the coil of the first position detection relay K1, the anode of the first light-emitting diode L7, the cathode of the eighth diode D8, the other end of the coil of the second position detection relay K2 and the anode of the second light-emitting diode L8 are commonly connected to a +24V DC power supply via the elevator car door lock contact KDL.

[0008] In another specific embodiment of the present invention, the speed monitoring circuit includes a coil of a first speed detection relay J1, a coil of a second speed detection relay J2, a first normally open contact J1-a of the first speed detection relay J1, a first normally open contact J2-a of the second speed detection relay J2, a first normally open contact KJ-a of a speed logic judgment relay KJ, a second normally open contact KJ-b, a third diode D3, a fourth diode D4, a ninth diode D9, a tenth diode D10, a third light-emitting diode L3, a fourth light-emitting diode L4, a third resistor R3 and a fourth resistor R4, the cathode of the third diode D3 is connected to a speed signal of the elevator drive system, the anode of the third diode D3 is connected to one end of the first normally open contact J1-a of the first speed detection relay J1 and one end of the first normally open contact KJ-a of the speed logic judgment relay KJ, the other end of the first normally open contact J1-a of the first speed detection relay J1 and the other end of the first normally open contact KJ-a of the speed logic judgment relay KJ are connected to the anode of the ninth diode D9, the first speed detection relay J1 One end of the coil is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the cathode of the third light-emitting diode L3, the cathode of the fourth diode D4 is connected to another speed signal of the elevator control system, the anode of the fourth diode D4 is connected to one end of the first normally open contact J2-a of the second speed detection relay J2 and one end of the second normally open contact KJ-b of the speed logic judgment relay KJ, the other end of the first normally open contact J2-a of the second speed detection relay J2 and the second normally open contact KJ-b of the speed logic judgment relay KJ The other end of -b is commonly connected to the anode of the tenth diode D10, one end of the coil of the second speed detection relay J2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the cathode of the fourth light-emitting diode L4, the cathode of the ninth diode D9, the other end of the coil of the first speed detection relay J1, the anode of the third light-emitting diode L3, the cathode of the tenth diode D10, the other end of the coil of the second speed detection relay J2 and the anode of the fourth light-emitting diode L4 are commonly connected to the +24V DC power supply via the elevator car door lock contact KDL.

[0009] In another specific embodiment of the present invention, the logic judgment circuit includes a speed logic judgment circuit and a position logic judgment circuit, and the speed logic judgment circuit includes a first capacitor C1, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, a fifth diode D5, a fifth light-emitting diode L5, a coil of a speed logic judgment relay KJ, a first normally closed contact J1-b of a first speed detection relay J1, and a first normally closed contact J2-b of a second speed detection relay J2, one end of the first normally closed contact J1-b of the first speed detection relay J1 is connected to one end of the first normally closed contact J2-b of the second speed detection relay J2. The other end of the first normally closed contact J2-b of the second speed detection relay J2 is connected to one end of the sixth resistor R6, the positive electrode of the fifth diode D5, one end of the coil of the speed logic judgment relay KJ and one end of the fifth resistor R5, the other end of the sixth resistor R6 is connected to one end of the first capacitor C1 and one end of the second capacitor C2, and the other end of the fifth resistor R5 is connected to the negative electrode of the fifth light-emitting diode L5. The position logic judgment circuit includes a third capacitor C3, a fourth capacitor C4, a seventh resistor R7, an eighth resistor R8, a sixth diode D6, a sixth light-emitting diode L6, a coil of the position logic judgment relay TJ, and a first The first normally closed contact K1-b of the first position detection relay K1 and the first normally closed contact K2-b of the second position detection relay K2, one end of the first normally closed contact K1-b of the first position detection relay K1 is connected to one end of the first normally closed contact K2-b of the second position detection relay K2, the other end of the first normally closed contact K2-b of the second position detection relay K2 is connected to one end of the eighth resistor R8, the anode of the sixth diode D6, one end of the coil of the position logic judgment relay TJ and one end of the seventh resistor R7, the other end of the eighth resistor R8 is connected to one end of the third capacitor C3 and one end of the fourth capacitor C4, the The other end is connected to the cathode of the sixth light-emitting diode L6, the anode of the fifth light-emitting diode L5, the other end of the coil of the speed logic judgment relay KJ, the cathode of the fifth diode D5, the other end of the first capacitor C1, the other end of the second capacitor C2, the anode of the sixth light-emitting diode L6, the other end of the coil of the position logic judgment relay TJ, the cathode of the sixth diode D6, the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are commonly connected to a +24V DC power supply, and the other end of the first normally closed contact K1-b of the first position detection relay K1 and the other end of the first normally closed contact J1-b of the first speed detection relay J1 are commonly grounded.

[0010] In another specific embodiment of the present invention, the stroke reduction action protection circuit includes a second normally open contact J1-c of the first speed detection relay J1, a second normally open contact J2-c of the second speed detection relay J2, a first normally closed contact KJ-c of the speed logic judgment relay KJ, a second normally open contact K1-c of the first position detection relay K1, a second normally open contact K2-c of the second position detection relay K2 and a first normally closed contact TJ-c of the position logic judgment relay TJ, one end of the second normally open contact J1-c of the first speed detection relay J1 and one end of the second normally open contact K1-c of the first position detection relay K1 are connected and constitute the PRS end of the circuit, connected to the brake control end and the output control end of the elevator main control board, and the second normally open contact of the first speed detection relay J1 The other end of J1-c is connected to one end of the second normally open contact J2-c of the second speed detection relay J2, the other end of the second normally open contact J2-c of the second speed detection relay J2 is connected to one end of the first normally closed contact KJ-c of the speed logic judgment relay KJ, the other end of the second normally open contact K1-c of the first position detection relay K1 is connected to one end of the second normally open contact K2-c of the second position detection relay K2, the other end of the second normally open contact K2-c of the second position detection relay K2 is connected to one end of the first normally closed contact TJ-c of the position logic judgment relay TJ, the other end of the first normally closed contact TJ-c of the position logic judgment relay TJ and the other end of the first normally closed contact KJ-c of the speed logic judgment relay KJ are connected to form the CM1 end of the circuit, and connected to the elevator door lock circuit.

[0011] In another specific embodiment of the present invention, the stroke reduction action feedback circuit includes a second normally closed contact K1-d of a first position detection relay K1, a second normally closed contact K2-d of a second position detection relay K2, a second normally closed contact J2-d of a second speed detection relay J2, and a second normally closed contact J1-d of a first speed detection relay J1, which are connected in series in sequence, and one end of the second normally closed contact K1-d of the first position detection relay K1 constitutes a PCU end of the circuit, which is used to connect to an action feedback input end of an elevator main control board, and one end of the second normally closed contact J1-d of the first speed detection relay J1 is connected to an input common end CM2 of the elevator main control board.

[0012] In a further specific embodiment of the present invention, it also includes an adhesion feedback circuit, which includes a third normally open contact TJ-d of a position logic judgment relay TJ and a third normally open contact KJ-d of a speed logic judgment relay KJ connected in parallel, one end of both of which together constitute the POF end of the circuit, which is used to connect to the adhesion feedback input end of the elevator main control board, and the other ends of both of which are commonly connected to the input common end CM2 of the elevator main control board.

[0013] The present invention adopts the above structure and realizes the safety protection of elevator terminal deceleration by adding a travel reduction monitoring function, which can avoid the elevator from hitting the top or squatting at the bottom in the case of abnormal parking, thereby improving the stability and safety of elevator use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a principle block diagram of the present invention.

[0015] Figure 2 This is an electrical connection diagram of the position monitoring circuit, speed monitoring circuit and logic judgment circuit described in the present invention.

[0016] Figure 3 This is an electrical connection diagram of the stroke reduction action protection circuit described in the present invention.

[0017] Figure 4 This is an electrical connection diagram of the stroke reduction action feedback circuit described in the present invention.

[0018] Figure 5 This is an electrical connection diagram of the adhesion feedback circuit described in the present invention.

[0019] Figure 6 This is a schematic diagram of the action of the car terminal position detection signal.

[0020] Figure 7 This is a schematic diagram of the operation of the car speed detection signal. DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0022] See also Figure 1 The present invention relates to a safety circuit for the deceleration function of an elevator, comprising a position monitoring circuit, a speed monitoring circuit, a logic judgment circuit, a deceleration action feedback circuit, an adhesion feedback circuit and a deceleration action protection circuit. The position monitoring circuit, the speed monitoring circuit and the logic judgment circuit are respectively connected to the deceleration action protection circuit, the deceleration action feedback circuit is respectively connected to the position monitoring circuit and the speed monitoring circuit, and the adhesion feedback circuit is connected to the logic judgment circuit. The present invention realizes the safety protection of elevator terminal deceleration by adding deceleration monitoring of the car position and speed.

[0023] See also Figure 2The position monitoring circuit includes a coil of a first position detection relay K1, a coil of a second position detection relay K2, a first normally open contact K1-a of the first position detection relay K1, a first normally open contact K2-a of the second position detection relay K2, a first normally open contact TJ-a of a position logic judgment relay TJ, a second normally open contact TJ-b, a first diode D1, a second diode D2, a seventh diode D7, an eighth diode D8, a first light-emitting diode L7, a second light-emitting diode L8, a first resistor R1, and a second resistor R2. The cathode of the first diode D1 is connected to a shaft position switch of the elevator to obtain a car position detection signal L1, and the cathode of the second diode D2 is connected to another shaft position switch of the elevator to obtain a car position detection signal L2. The first position detection relay K1 is controlled by a position signal of the elevator and the position logic judgment relay TJ. When the position signal is connected and the first normally open contact TJ-a of the position logic judgment relay TJ is closed, the first position detection relay K1 is energized and starts to operate. The second position detection relay K2 is controlled by another position signal of the elevator and the position logic judgment relay TJ. When the position signal is turned on and the second normally open contact TJ-b of the position logic judgment relay TJ is closed, the second position detection relay K2 is energized and starts to operate.

[0024] The speed monitoring circuit includes a coil of a first speed detection relay J1, a coil of a second speed detection relay J2, a first normally open contact J1-a of the first speed detection relay J1, a first normally open contact J2-a of the second speed detection relay J2, a first normally open contact KJ-a of a speed logic judgment relay KJ, a second normally open contact KJ-b, a third diode D3, a fourth diode D4, a ninth diode D9, a tenth diode D10, a third light-emitting diode L3, a fourth light-emitting diode L4, a third resistor R3 and a fourth resistor R4. The cathode of the third diode D3 is connected to a speed signal of the elevator drive system, which is marked as the car speed detection signal VI, and the cathode of the fourth diode D4 is connected to another speed signal of the elevator control system, which is marked as the car speed detection signal VS. The first speed detection relay J1 is controlled by a speed signal of the elevator and the speed logic judgment relay KJ. When the speed signal is connected and the first normally open contact KJ-a of the speed logic judgment relay KJ is closed, the first speed detection relay J1 is energized and starts to operate. The second speed detection relay J2 is controlled by another speed signal of the elevator and the speed logic judgment relay KJ. When the speed signal is turned on and the second normally open contact KJ-b of the speed logic judgment relay KJ is closed, the second speed detection relay J2 is energized and starts to operate.

[0025] Further, the cathode of the seventh diode D7, the other end of the coil of the first position detection relay K1, the anode of the first light-emitting diode L7, the cathode of the eighth diode D8, the other end of the coil of the second position detection relay K2, the anode of the second light-emitting diode L8, the cathode of the ninth diode D9, the other end of the coil of the first speed detection relay J1, the anode of the third light-emitting diode L3, the cathode of the tenth diode D10, the other end of the coil of the second speed detection relay J2 and the anode of the fourth light-emitting diode L4 are connected to the +24V DC power supply through the elevator car door lock contact KDL. When the door is opened, the first position detection relay K1 and the second position detection relay K2 are powered off by the position logic judgment relay TJ and the first speed detection relay J1 and the second speed detection relay J2 are powered off by the speed logic judgment relay KJ to achieve forced flipping.

[0026] Please continue reading Figure 2 , the logic judgment circuit includes a speed logic judgment circuit and a position logic judgment circuit. The speed logic judgment circuit includes a first capacitor C1, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, a fifth diode D5, a fifth light-emitting diode L5, a coil of a speed logic judgment relay KJ, a first normally closed contact J1-b of a first speed detection relay J1, and a first normally closed contact J2-b of a second speed detection relay J2. The suction of the speed logic judgment relay KJ is controlled by the first speed detection relay J1 and the second speed detection relay J2 at the same time. The first capacitor C1, the second capacitor C2 and the sixth resistor R6 are connected in parallel with the coil of the speed logic judgment relay KJ, which is used for the function of power-off delay release of the real-line speed logic judgment relay KJ to avoid contact timing competition. The position logic judgment circuit includes a third capacitor C3, a fourth capacitor C4, a seventh resistor R7, an eighth resistor R8, a sixth diode D6, a sixth light-emitting diode L6, a coil of a position logic judgment relay TJ, a first normally closed contact K1-b of a first position detection relay K1, and a first normally closed contact K2-b of a second position detection relay K2. The attraction of the position logic judgment relay TJ is controlled by both the first position detection relay K1 and the second position detection relay K2. The third capacitor C3, the fourth capacitor C4, and the eighth resistor R8 are connected in parallel to the coil of the position logic judgment relay TJ, and are used to realize the function of power-off delay release of the position logic judgment relay TJ to avoid contact timing competition.

[0027] See also Figure 3The stroke reduction action protection circuit includes the second normally open contact J1-c of the first speed detection relay J1, the second normally open contact J2-c of the second speed detection relay J2, the first normally closed contact KJ-c of the speed logic judgment relay KJ, the second normally open contact K1-c of the first position detection relay K1, the second normally open contact K2-c of the second position detection relay K2 and the first normally closed contact TJ-c of the position logic judgment relay TJ. The PRS end of the circuit is connected to the brake control end and the output control end of the elevator main control board, while the CM1 end is connected to the elevator door lock circuit, which is used to realize the forced cutting off of the output contactor and the brake contactor coil power supply during the stroke reduction action protection, so as to make the elevator emergency brake.

[0028] See also Figure 4The deceleration action feedback circuit includes the second normally closed contact K1-d of the first position detection relay K1, the second normally closed contact K2-d of the second position detection relay K2, the second normally closed contact J2-d of the second speed detection relay J2, and the second normally closed contact J1-d of the first speed detection relay J1, which are connected in series in sequence. The PCU end of the circuit is connected to the action feedback input end of the elevator main control board, and one end of the second normally closed contact J1-d of the first speed detection relay J1 is connected to the input common end CM2 of the elevator main control board, which is used to detect whether the actions of the first position detection relay K1, the second position detection relay K2, the first speed detection relay J1, and the second speed detection relay J2 are normal. If the second normally closed contact K1-d of the first position detection relay K1 is not disconnected after the coil of the first position detection relay K1 is energized, the PCU end of the main control board will not receive the action feedback; if the second normally closed contact K1-d of the first position detection relay K1 is not closed after the coil of the first position detection relay K1 is deenergized, the PCU end of the main control board will still receive the action feedback. If the second normally closed contact K2-d of the second position detection relay K2 is not disconnected after the coil of the second position detection relay K2 is energized, the PCU end of the main control board will not receive action feedback. If the second normally closed contact K2-d of the second position detection relay K2 is not closed after the coil of the second position detection relay K2 is de-energized, the PCU end of the main control board will still receive action feedback. If the second normally closed contact J1-d of the first speed detection relay J1 is not disconnected after the coil of the first speed detection relay J1 is energized, the PCU end of the main control board will not receive action feedback. If the second normally closed contact J1-d of the first speed detection relay J1 is not closed after the coil of the first speed detection relay J1 is de-energized, the PCU end of the main control board will still receive action feedback. If the second normally closed contact J2-d of the second speed detection relay J2 is not disconnected after the coil of the second speed detection relay J2 is energized, the PCU end of the main control board will not receive action feedback. If the second normally closed contact J2-d of the second speed detection relay J2 is not closed after the coil of the second speed detection relay J2 is de-energized, the PCU end of the main control board will still receive action feedback. The above-mentioned abnormalities in the feedback detection of the reduced stroke action will cause the reduced stroke protection circuit to operate.

[0029] See also Figure 5The adhesion feedback circuit includes the third normally open contact TJ-d of the position logic judgment relay TJ and the third normally open contact KJ-d of the speed logic judgment relay KJ connected in parallel, one end of the two together constitutes the POF end of the circuit, which is used to connect the adhesion feedback input end of the elevator main control board, and the other end of the two together connects the input common end CM2 of the elevator main control board. If the third normally open contact TJ-d of the position logic judgment relay TJ is not closed after the coil of the position logic judgment relay TJ is energized, the POF end of the main control board will not receive adhesion feedback. On the contrary, if the third normally open contact TJ-d of the position logic judgment relay TJ is not disconnected after the coil of the position logic judgment relay TJ is de-energized, the POF end of the main control board will still receive adhesion feedback. Similarly, if the third normally open contact KJ-d of the speed logic judgment relay KJ is not closed after the coil of the speed logic judgment relay KJ is energized, the POF end of the main control board will not receive the adhesion feedback. If the third normally open contact KJ-d of the speed logic judgment relay KJ is not disconnected after the coil of the speed logic judgment relay KJ is de-energized, the POF end of the main control board will still receive the adhesion feedback. The above safety relay adhesion feedback detection abnormalities will cause the travel reduction protection circuit to operate.

[0030] The working principle of the present invention is further described below. Before describing the implementation of the reduced stroke operation, the action mode of the car position detection signals L1, L2 and the car speed detection signals VI, VS is first described. Figure 6 As shown. The car position detection signals L1 and L2 are provided by the bistable switch. When the car is running at the upper terminal station ( Figure 6 The uppermost area of ​​the dotted box shown in the figure), the bistable switches corresponding to the car position detection signals L1 and L2 do not operate; when the car is running at the lower end station ( Figure 6 The bistable switches corresponding to the car position detection signals L1 and L2 do not operate; when the elevator is running in the middle of the floor ( Figure 6 The middle area of ​​the dashed box shown in the figure) is in the position of the car position detection signal L1, L2 corresponding to the bistable switch is activated. Figure 7 The car speed detection signal VI is the car speed signal fed back by the elevator driver, and VS is the car speed signal fed back by the elevator controller. When the car speed is detected to be greater than the speed set by the reduction stroke, the car speed detection signals VI and VS are activated; when the car speed is detected to be less than or equal to the speed set by the reduction stroke, the car speed detection signals VI and VS are inactive.

[0031] The specific stroke reduction workflow is as follows:

[0032] In the first case, when the car runs to the upper station position area, the car position detection signals L1 and L2 do not work, and the first position detection relay K1 and the second position detection relay K2 shall not be energized. During the operation of the elevator, if the speed signal is less than the set deceleration speed, the first speed detection relay J1 and the second speed detection relay J2 in the deceleration action protection circuit are turned on, that is, the PRS end and the CM1 end of the deceleration action protection circuit are turned on, and the brake and running contactor control circuits are turned on. At this time, the elevator controller can control the elevator operation normally. If the speed signal is greater than or equal to the set deceleration speed, the first speed detection relay J1 and the second speed detection relay J2 in the deceleration action protection circuit are disconnected, that is, the PRS end and the CM1 end of the deceleration action protection circuit are disconnected, and the brake and running contactor control circuits are disconnected, so that the car can be safely stopped.

[0033] In the second case, when the car runs to the lower station position area, the car position detection signals L1 and L2 do not work, the first position detection relay K1 and the second position detection relay K2 are not energized, and the first position detection relay K1 and the second position detection relay K2 in the stroke reduction action protection circuit are disconnected. If the speed signal is less than the set stroke reduction speed, the first speed detection relay J1 and the second speed detection relay J2 in the stroke reduction action protection circuit are turned on, that is, the PRS end and the CM1 end of the stroke reduction action protection circuit are turned on, and the brake and running contactor control circuits are turned on. At this time, the elevator controller can control the elevator operation normally; if the speed signal is greater than or equal to the set stroke reduction speed, the first speed detection relay J1 and the second speed detection relay J2 are disconnected, that is, the PRS end and the CM1 end of the stroke reduction action protection circuit are disconnected, and the brake and running contactor control circuits are disconnected, so that the car can be safely stopped.

[0034] In the third case, when the car is running in the middle position area, the car position detection signals L1 and L2 are both activated, the first position detection relay K1 and the second position detection relay K2 are energized, and the first position detection relay K1 and the second position detection relay K2 in the stroke reduction action protection circuit are turned on. At this time, regardless of whether the car speed detection signals VI and VS are activated, the PRS and CM1 terminals of the stroke reduction action protection circuit are turned on, the brake and running contactor control circuits are turned on, and the elevator controller can control the elevator operation normally.

Claims

1. An elevator travel reduction functional safety circuit, characterized in that: The invention comprises a position monitoring circuit, a speed monitoring circuit, a logic judgment circuit, a stroke reduction action feedback circuit, an adhesion feedback circuit and a stroke reduction action protection circuit. The position monitoring circuit, the speed monitoring circuit and the logic judgment circuit are respectively connected to the stroke reduction action protection circuit. The stroke reduction action feedback circuit is respectively connected to the position monitoring circuit and the speed monitoring circuit. The adhesion feedback circuit is connected to the logic judgment circuit. The position monitoring circuit comprises a coil of a first position detection relay K1, a coil of a second position detection relay K2, a first normally open contact K1-a of the first position detection relay K1, a first normally open contact K2-b of the second position detection relay K2, and a first normally open contact K2-c of the second position detection relay K2. a, a first normally open contact TJ-a, a second normally open contact TJ-b, a first diode D1, a second diode D2, a seventh diode D7, an eighth diode D8, a first light emitting diode L7, a second light emitting diode L8, a first resistor R1 and a second resistor R2 of a position logic judgment relay TJ, wherein the cathode of the first diode D1 is connected to a shaft position switch of the elevator, the anode of the first diode D1 is connected to one end of the first normally open contact K1-a of the first position detection relay K1 and one end of the first normally open contact TJ-a of the position logic judgment relay TJ, the other end of the first normally open contact K1-a of the first position detection relay K1 and the position logic judgment relay TJ are connected to the first normally open contact K1-a of the first position detection relay K1 and the position logic judgment relay TJ. The other end of the first normally open contact TJ-a of the logic judgment relay TJ is commonly connected to the anode of the seventh diode D7, one end of the coil of the first position detection relay K1 and one end of the first resistor R1, the other end of the first resistor R1 is connected to the cathode of the first light-emitting diode L7, the cathode of the second diode D2 is connected to another shaft position switch of the elevator, the anode of the second diode D2 is connected to one end of the first normally open contact K2-a of the second position detection relay K2 and one end of the second normally open contact TJ-b of the position logic judgment relay TJ, the other end of the first normally open contact K2-a of the second position detection relay K2 and the position logic judgment relay TJ The other end of the second normally open contact TJ-b is commonly connected to the anode of the eighth diode D8, one end of the coil of the second position detection relay K2 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the cathode of the second light-emitting diode L8, the cathode of the seventh diode D7, the other end of the coil of the first position detection relay K1, the anode of the first light-emitting diode L7, the cathode of the eighth diode D8, the other end of the coil of the second position detection relay K2 and the anode of the second light-emitting diode L8 are commonly connected to a +24V DC power supply via the elevator car door lock contact KDL, the logic judgment circuit includes a speed logic judgment circuit and a position logic judgment circuit,The speed logic judgment circuit includes a first capacitor C1, a second capacitor C2, a fifth resistor R5, a sixth resistor R6, a fifth diode D5, a fifth light-emitting diode L5, a coil of a speed logic judgment relay KJ, a first normally closed contact J1-b of a first speed detection relay J1, and a first normally closed contact J2-b of a second speed detection relay J2, one end of the first normally closed contact J1-b of the first speed detection relay J1 is connected to one end of the first normally closed contact J2-b of the second speed detection relay J2, and the other end of the first normally closed contact J2-b of the second speed detection relay J2 is connected to the sixth resistor R 6, the anode of the fifth diode D5, one end of the coil of the speed logic judgment relay KJ and one end of the fifth resistor R5, the other end of the sixth resistor R6 is connected to one end of the first capacitor C1 and one end of the second capacitor C2, the other end of the fifth resistor R5 is connected to the cathode of the fifth light-emitting diode L5, the position logic judgment circuit includes the third capacitor C3, the fourth capacitor C4, the seventh resistor R7, the eighth resistor R8, the sixth diode D6, the sixth light-emitting diode L6, the coil of the position logic judgment relay TJ, the first normally closed contact K1-b of the first position detection relay K1 and the second The first normally closed contact K2-b of the position detection relay K2, one end of the first normally closed contact K1-b of the first position detection relay K1 is connected to one end of the first normally closed contact K2-b of the second position detection relay K2, the other end of the first normally closed contact K2-b of the second position detection relay K2 is connected to one end of the eighth resistor R8, the positive electrode of the sixth diode D6, one end of the coil of the position logic judgment relay TJ and one end of the seventh resistor R7, the other end of the eighth resistor R8 is connected to one end of the third capacitor C3 and one end of the fourth capacitor C4, and the other end of the seventh resistor R7 is connected to the sixth light-emitting diode The cathode of L6, the anode of the fifth light-emitting diode L5, the other end of the coil of the speed logic judgment relay KJ, the cathode of the fifth diode D5, the other end of the first capacitor C1, the other end of the second capacitor C2, the anode of the sixth light-emitting diode L6, the other end of the coil of the position logic judgment relay TJ, the cathode of the sixth diode D6, the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are connected to the +24V DC power supply, and the other end of the first normally closed contact K1-b of the first position detection relay K1 and the other end of the first normally closed contact J1-b of the first speed detection relay J1 are grounded.

2. An elevator stroke reduction function safety circuit according to claim 1, characterized in that The speed monitoring circuit includes a coil of a first speed detection relay J1, a coil of a second speed detection relay J2, a first normally open contact J1-a of the first speed detection relay J1, a first normally open contact J2-a of the second speed detection relay J2, a first normally open contact KJ-a of a speed logic judgment relay KJ, a second normally open contact KJ-b, a third diode D3, a fourth diode D4, a ninth diode D9, a tenth diode D10, a third light-emitting diode L3, a fourth light-emitting diode L4, a third resistor R3 and a fourth resistor R4, the cathode of the third diode D3 is connected to a speed signal of the elevator drive system, the anode of the third diode D3 is connected to one end of the first normally open contact J1-a of the first speed detection relay J1 and one end of the first normally open contact KJ-a of the speed logic judgment relay KJ, the other end of the first normally open contact J1-a of the first speed detection relay J1 and the other end of the first normally open contact KJ-a of the speed logic judgment relay KJ are connected together with the anode of the ninth diode D9, one end of the coil of the first speed detection relay J1 and One end of the third resistor R3 is connected, the other end of the third resistor R3 is connected to the cathode of the third light-emitting diode L3, the cathode of the fourth diode D4 is connected to another speed signal of the elevator control system, the anode of the fourth diode D4 is connected to one end of the first normally open contact J2-a of the second speed detection relay J2 and one end of the second normally open contact KJ-b of the speed logic judgment relay KJ, the other end of the first normally open contact J2-a of the second speed detection relay J2 and the other end of the second normally open contact KJ-b of the speed logic judgment relay KJ are commonly connected to the anode of the tenth diode D10, one end of the coil of the second speed detection relay J2 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the cathode of the fourth light-emitting diode L4, the cathode of the ninth diode D9, the other end of the coil of the first speed detection relay J1, the anode of the third light-emitting diode L3, the cathode of the tenth diode D10, the other end of the coil of the second speed detection relay J2 and the anode of the fourth light-emitting diode L4 are commonly connected to the +24V DC power supply via the elevator car door lock contact KDL.

3. The elevator stroke reduction function safety circuit according to claim 1 is characterized in that The stroke reduction action protection circuit includes the second normally open contact J1-c of the first speed detection relay J1, the second normally open contact J2-c of the second speed detection relay J2, the first normally closed contact KJ-c of the speed logic judgment relay KJ, the second normally open contact K1-c of the first position detection relay K1, the second normally open contact K2-c of the second position detection relay K2 and the first normally closed contact TJ-c of the position logic judgment relay TJ. One end of the second normally open contact J1-c of the first speed detection relay J1 and one end of the second normally open contact K1-c of the first position detection relay K1 are connected to form the PRS end of the circuit, which is connected to the brake control end and the output control end of the elevator main control board. The other end of the second normally open contact J1-c of the first speed detection relay J1 One end of the second normally open contact J2-c of the second speed detection relay J2 is connected, the other end of the second normally open contact J2-c of the second speed detection relay J2 is connected to one end of the first normally closed contact KJ-c of the speed logic judgment relay KJ, the other end of the second normally open contact K1-c of the first position detection relay K1 is connected to one end of the second normally open contact K2-c of the second position detection relay K2, the other end of the second normally open contact K2-c of the second position detection relay K2 is connected to one end of the first normally closed contact TJ-c of the position logic judgment relay TJ, the other end of the first normally closed contact TJ-c of the position logic judgment relay TJ and the other end of the first normally closed contact KJ-c of the speed logic judgment relay KJ are connected to form the CM1 end of the circuit, and connected to the elevator door lock circuit.

4. The elevator stroke reduction function safety circuit according to claim 1 is characterized in that The stroke reduction action feedback circuit includes a second normally closed contact K1-d of a first position detection relay K1, a second normally closed contact K2-d of a second position detection relay K2, a second normally closed contact J2-d of a second speed detection relay J2, and a second normally closed contact J1-d of a first speed detection relay J1, which are connected in series in sequence, and one end of the second normally closed contact K1-d of the first position detection relay K1 constitutes a PCU end of the circuit, which is used to connect to the action feedback input end of the elevator main control board, and one end of the second normally closed contact J1-d of the first speed detection relay J1 is connected to the input common end CM2 of the elevator main control board.

5. The elevator stroke reduction function safety circuit according to claim 1 is characterized in that It also includes an adhesion feedback circuit, which includes a third normally open contact TJ-d of a position logic judgment relay TJ and a third normally open contact KJ-d of a speed logic judgment relay KJ connected in parallel, one end of which together constitutes the POF end of the circuit, which is used to connect to the adhesion feedback input end of the elevator main control board, and the other ends of which are commonly connected to the input common end CM2 of the elevator main control board.

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