A hydraulic fault alarm system for elevators

Abstract

The present invention provides a hydraulic fault alarm system for an elevator, which belongs to the technical field of elevators. It solves the problem of how to ensure monitoring stability and accuracy while reducing the difficulty of arranging the alarm system. The hydraulic fault alarm system of this elevator includes a mounting plate, on which are arranged an oil tank, an alarm, a hydraulic motor, a first oil pump, a first oil pipeline, and a hydraulic cylinder. The mounting plate is also provided with a generator connected to the hydraulic motor and providing power to the alarm. The oil outlet of the hydraulic motor is connected to the oil inlet of the oil tank, and the oil inlet is connected to the first oil pump through the first oil pipeline. The first oil pump is connected to the oil outlet of the oil tank, and a pulley is installed on the pump shaft. A first overflow valve is installed on the first oil pipeline. The hydraulic cylinder is connected to the first overflow valve, and the output shaft abuts against the alarm switch. The hydraulic fault alarm system of this elevator can ensure monitoring stability and accuracy while reducing the difficulty of arranging the fault alarm system.

Description

Technical Field

[0001] The invention belongs to the technical field of elevators and relates to a hydraulic fault alarm system for an elevator. Background Art

[0002] An elevator is a vertical lift powered by an electric motor. It generally consists of a car and a traction system installed in the elevator shaft. The car is controlled to rise and fall in the elevator shaft by ropes, thereby realizing the transportation of people or goods in high-rise buildings.

[0003] In recent years, accidents involving box elevators have occurred frequently. A car falling rapidly from a height will violently collide with the bottom of the elevator shaft. The energy of the collision will pose a serious threat to the lives of passengers in the car. In the existing technology, in order to ensure accurate monitoring and feedback of the up and down speed of the elevator, a sensor (specifically, a speed sensor, an acceleration sensor, a force sensor, etc.) is generally installed on the car. At the same time, a controller is installed in the elevator shaft that is wirelessly connected to the sensor on the car and an external terminal. The sensor collects the up and down speed of the car during operation and transmits the data to the controller. The controller then determines whether the up and down speed of the car is normal, so that managers can detect elevator failures early.

[0004] However, the above structure has major defects. Specifically, the sensor needs to be installed on the car and connected to the external power supply through wires. However, due to the existence of the car, the space in the elevator shaft becomes cramped, which makes it more difficult to lay out the wires for supplying power, resulting in increased limitations on the layout of the sensor. At the same time, the sensor is installed on the car, and its sensitivity to overweight and weightlessness is low. The monitored data is inaccurate and prone to false alarms. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a hydraulic fault alarm system for elevators. The technical problem to be solved by the present invention is: how to ensure monitoring stability and monitoring accuracy while reducing the difficulty of arranging the fault alarm system.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A hydraulic fault alarm system for an elevator, comprising a mounting plate for installation on the top of an elevator shaft, characterized in that an oil tank with an oil inlet and an oil outlet, an alarm, a hydraulic motor, a first oil pump, a first oil pipeline and a hydraulic cylinder are provided on the mounting plate, and a generator driven by the hydraulic motor and powered by the alarm is also provided on the mounting plate, the oil outlet end of the hydraulic motor is connected to the oil inlet and the oil inlet end is connected to the first oil pump through the first oil pipeline, the first oil pump is connected to the oil outlet and a pulley for connecting a wire rope is installed on the pump shaft, a first overflow valve is installed on the first oil pipeline, the hydraulic cylinder is connected to the first overflow valve and the output shaft is abutted against the alarm switch.

[0007] The hydraulic fault alarm device of this elevator includes a mounting plate, which is fixed to the top of the elevator shaft by bolts. An oil tank, an alarm, a hydraulic motor, a generator, a first oil pump, a first oil pipeline and a hydraulic cylinder are installed on the mounting plate. By integrating various components on the mounting plate connected to the top of the elevator shaft, it is ensured that the various components will not interfere with the elevator car, thereby ensuring a more reasonable installation layout and reducing the difficulty of arranging the fault alarm system. An oil inlet and an oil outlet are provided on the oil tank. The first oil pump is connected to the oil outlet of the oil tank and its own pump shaft is equipped with a mechanism for interfering with the elevator steel The pulley is connected by a wire rope, and the generator is electrically connected to the alarm through a wire. In addition, the hydraulic motor is connected to the generator through a transmission connection, the oil outlet of the hydraulic motor is connected to the oil inlet of the oil tank, and the oil inlet of the hydraulic motor is connected to the first oil pump through the first oil pipeline. When the elevator is operating normally, the sliding of the wire rope will drive the pulley to rotate, thereby causing the pump shaft of the first oil pump to rotate. In this state, the first oil pump can extract oil from the oil tank and input the oil into the hydraulic motor through the first delivery pipeline. At this time, the hydraulic motor drives the generator to rotate, thereby converting kinetic energy into electrical energy and inputting it into The alarm device can be in working state in real time without external power supply, ensuring that the alarm system can power the alarm, and the oil used by the hydraulic motor can flow back to the oil tank through the oil inlet on the oil tank, so as to ensure that the oil can be recycled. On this basis, a first overflow valve is installed on the first oil pipeline, and a hydraulic cylinder with an output shaft and an alarm switch abutting against each other is installed on the first overflow valve. When the car goes up or down too fast, the sliding speed of the elevator wire rope becomes faster, which makes the pulley speed faster. In this state, the first oil pump is operated from The amount of oil pumped out of the oil tank increases. At this time, the rate at which the oil flows through the hydraulic motor and returns to the oil tank is constant (that is, the pressure at the oil output port of the hydraulic motor remains unchanged), and the oil pressure in the first delivery pipe continues to increase until the pressure reaches the threshold of the overflow valve, pushing the overflow valve open. In this state, the oil that passes through the overflow valve will act on the hydraulic cylinder, and the output shaft of the hydraulic cylinder will be pushed outward and squeeze the switch of the alarm, thereby activating the alarm. This avoids the defect of inaccurate sensor monitoring in the existing technology, and promptly reminds the manager of elevator fault anomalies while avoiding false alarms.

[0008] In the above-mentioned hydraulic fault alarm system of the elevator, a second oil pipeline and a second oil pump connected to the oil outlet are also installed on the mounting plate, a driving gear is provided on the pump shaft of the first oil pump, and a passive gear meshing with the driving gear is provided on the pump shaft of the second oil pump. One end of the second oil pipeline is connected to the second oil pump, and the other end is connected to the oil inlet end of the hydraulic motor, and a second overflow valve connected to the hydraulic cylinder is also provided on the second oil pipeline.

[0009] The second oil pump is in an idling state and cannot be used to suck oil from the oil tank through the oil outlet. The first oil pump cooperates with the hydraulic motor and the generator to supply power to the alarm. At the same time, the first oil pump is in a descent state and the second oil pump is in an idling state and cannot be used to suck oil from the oil tank through the oil outlet. The alarm is powered by the cooperation of the first oil pipeline, the hydraulic motor and the generator. At the same time, the elevator is monitored by the cooperation of the first overflow valve and the hydraulic cylinder. Whether the elevator is moving normally is monitored, and timely feedback is given when there is a fault in the elevator going down. When the elevator is moving up, the wire rope of the elevator drives the pulley to slide in the opposite direction, causing the pump shaft of the first oil pump to rotate counterclockwise and the pump shaft of the second oil pump to rotate clockwise. In this state, the first oil pump is in an idling state and cannot draw oil from the oil tank through the oil outlet. The second oil pump draws oil from the oil tank through the oil outlet, and supplies power to the alarm through the second oil pipeline, the hydraulic motor and the generator. At the same time, the second overflow valve and the hydraulic cylinder cooperate to monitor whether the elevator's upward speed is normal, and timely feedback is given when there is a fault in the elevator going down. As a result, the generator can power the alarm when the elevator is moving up or down, and the upward speed and downward speed of the car are monitored separately to reduce monitoring errors.

[0010] In the above-mentioned hydraulic fault alarm system of the elevator, a first branch pipe is installed on the first overflow valve, one end of the first branch pipe is connected to the output end of the first overflow valve, and the other end is installed with a first throttle valve connected to the input end of the hydraulic cylinder.

[0011] A first branch pipe is installed on the first overflow valve, one end of which is connected to the output end of the first overflow valve, and the other end is installed with a first throttle valve connected to the input end of the hydraulic cylinder. The first throttle valve controls (when the elevator descends too fast) the oil in the first oil pipeline that is transported to the hydraulic cylinder through the first overflow valve, thereby ensuring stable oil delivery and the working stability of the hydraulic cylinder.

[0012] In the above-mentioned hydraulic fault alarm system of the elevator, a second branch pipe is installed on the second overflow valve, one end of the second branch pipe is connected to the output end of the second overflow valve, and the other end is installed with a second throttle valve connected to the input end of the hydraulic cylinder.

[0013] Similarly, a second branch pipe is installed on the first overflow valve. One end of the second branch pipe is connected to the output end of the second overflow valve, and the other end is equipped with a second throttle valve connected to the input end of the hydraulic cylinder. The second throttle valve controls (when the elevator goes up too fast) the oil in the second oil pipeline that is transported to the hydraulic cylinder through the second overflow valve, thereby ensuring stable oil delivery and the working stability of the hydraulic cylinder.

[0014] In the above-mentioned hydraulic fault alarm system for an elevator, a first one-way valve and a second one-way valve are further provided on the first oil pipeline, and the first overflow valve is located between the first one-way valve and the second one-way valve.

[0015] A first one-way valve and a second one-way valve are provided on both sides of the first overflow valve on the first oil pipeline. When the engine oil flows, it can prevent the engine oil from flowing back from the oil outlet of the oil tank after passing through the first one-way valve, and prevent the engine oil from flowing back through the first overflow valve after passing through the second one-way valve.

[0016] In the above-mentioned hydraulic fault alarm system for an elevator, a third one-way valve and a fourth one-way valve are further provided on the second oil pipeline, and the second overflow valve is located between the third one-way valve and the fourth one-way valve.

[0017] Similarly, a third one-way valve and a fourth one-way valve are arranged on both sides of the second overflow valve on the second oil pipeline. During the flow of the engine oil, after passing through the third one-way valve, the engine oil can be prevented from flowing back from the oil outlet of the oil tank. After passing through the fourth one-way valve, the engine oil can be prevented from flowing back through the second overflow valve.

[0018] In the hydraulic fault alarm system of the above-mentioned elevator, a battery is also installed on the mounting plate, an oil inlet pipe is provided at the oil inlet end of the hydraulic motor, and an oil outlet pipe is provided at the oil outlet end. The oil inlet pipe is respectively connected to the first oil pipeline and the second oil pipeline, and the oil outlet pipe is connected to the oil inlet. The battery is connected to the generator and the alarm through wires.

[0019] A battery is also installed on the mounting plate, and the battery is connected to the generator and the alarm through wires respectively. The oil inlet end of the hydraulic motor is provided with an oil inlet pipe, and the oil outlet end is provided with an oil outlet pipe. The oil inlet pipe is used to connect the first oil pipeline and the second oil pipeline, and the oil outlet pipe is used to connect the oil inlet of the oil tank. The engine oil is input into the hydraulic motor through the first oil pump, the first oil pipeline and the oil inlet pipe (or input into the hydraulic motor through the second oil pump, the second oil pipeline and the oil inlet pipe), and then input into the oil tank through the oil outlet pipe and the oil inlet of the oil tank, thereby completing one circulation of the engine oil. The flowing engine oil can drive the hydraulic motor to start, and at the same time, the hydraulic motor (through the coupling) inputs kinetic energy into the generator, so that the generator generates electricity. The electricity generated by the generator is input into the battery for storage through wires, and the alarm is powered by the electricity stored in the battery.

[0020] In the above-mentioned hydraulic fault alarm system for an elevator, an oil return filter is installed on the oil inlet, and the oil outlet pipe is connected to the oil inlet through the oil return filter.

[0021] A return oil filter is installed on the oil inlet. When the engine oil is input into the fuel tank through the oil outlet pipe and the oil inlet of the fuel tank, the engine oil can first be filtered through the return oil filter, thereby filtering the circulating engine oil to avoid impurities mixing into the engine oil and prevent the pipelines from being blocked after long-term use.

[0022] Compared with the existing technology, the hydraulic fault alarm system of this elevator has the following advantages:

[0023] 1. The hydraulic fault alarm system of this elevator is coordinated by the oil tank, hydraulic motor, generator, oil pump and oil pipeline. It uses the mechanical energy of the elevator when it goes up and down to generate self-generated electricity and supply it to the alarm, ensuring the reasonable layout of the alarm system. At the same time, the oil pipeline, relief valve and hydraulic cylinder are used to accurately monitor the up and down speed of the elevator, and the alarm is activated according to the oil pressure difference under abnormal conditions, effectively ensuring monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the hydraulic fault alarm system of this elevator.

[0025] Figure 2 This is a structural diagram of the hydraulic fault alarm system of this elevator from another perspective.

[0026] Figure 3 yes Figure 1 A partial enlarged view of point A in the middle.

[0027] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle.

[0028] Figure 5 It is a structural diagram of the fuel tank.

[0029] In the figure, 1. mounting plate;

[0030] 2. Fuel tank; 21. Oil inlet; 211. Oil return filter; 22. Oil outlet;

[0031] 3. Alarm;

[0032] 40. Hydraulic motor; 401. Oil inlet pipe; 402. Oil outlet pipe; 41. Generator; 42. Battery;

[0033] 5. First oil pump; 51. Pulley; 52. Driving gear;

[0034] 6. First oil pipeline; 61. First overflow valve; 611. First branch pipeline; 6111. First throttle valve; 62. First one-way valve; 63. Second one-way valve;

[0035] 7. Hydraulic cylinder;

[0036] 8. Second oil pipeline; 81. Second overflow valve; 811. Second branch pipeline; 8111. Second throttle valve; 82. Third one-way valve; 83. Fourth one-way valve;

[0037] 9. Second oil pump; 91. Passive gear. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0039] like Figure 1-2 As shown, the hydraulic fault alarm system of the present elevator includes a mounting plate 1 for installation on the top of the elevator shaft, on which are provided an oil tank 2, an alarm 3, a hydraulic motor 40, a generator 41, a battery 42, a first oil pump 5, a second oil pump 9, a first oil pipeline 6, a second oil pipeline 8 and a hydraulic cylinder 7. The mounting plate 1 is in the shape of a rectangular plate, the oil tank 2 is fixed at the middle of one side of the mounting plate 1, the hydraulic motor 40, the generator 41 and the battery 42 are located on one side of the oil tank 2, the first oil pump 5 and the second oil pump 9 are located on the other side of the oil tank 2 (the first oil pump 5 and the second oil pump 9 are specifically vane pumps, and as an alternative, they can also be pressure pumps). On one side of the oil tank 2, mounting base 1, mounting base 2 and mounting base 3 are fixed on the mounting plate 1, and the hydraulic motor 40 is fixed On the mounting seat one, the generator 41 is fixed on the mounting seat two, the output shaft of the hydraulic motor 40 is connected to the input shaft of the generator 41 through a first coupling, the battery 42 is connected to the generator 41 through an input wire, and the alarm 3 is fixed on the mounting seat three and connected to the battery 42 through an output wire; the first oil pump 5 and the second oil pump 9 are arranged in parallel, and a driving gear 52 is fixed on the pump shaft of the first oil pump 5, and a passive gear 91 is fixed on the pump shaft of the second oil pump 9, and the driving gear 52 is meshed with the passive gear 91. In addition, a fixing seat four is provided on the mounting plate 1, and a bearing is provided in the fixing seat four. A rotating shaft is fixed in the inner ring of the bearing, and a pulley 51 for connecting the elevator wire rope is fixed on the rotating shaft, and the rotating shaft and the driving gear 52 are fixedly connected by a second coupling.

[0040] Combine Figure 5The oil tank 2 is provided with an oil inlet 21 toward the top of the power generation unit, and two oil outlets 22 are provided on the side facing the first oil pump 5 and the second oil pump 9. The input port of the first oil pump 5 is connected to one of the oil outlets 22 of the oil tank 2 through a first input pipe, and the input port of the second oil pump 9 is connected to the other oil outlet 22 of the oil tank 2. An oil inlet pipe 401 is provided on the oil inlet end of the hydraulic motor 41, and an oil outlet pipe 402 connected to the oil inlet 21 of the oil tank 2 is provided on the oil outlet end. A first tee is installed on the end of the oil inlet pipe 401 facing away from the hydraulic motor 40, and a second tee is installed on the end of the oil inlet pipe 401 facing away from the hydraulic motor 40. One end of an oil pipeline 6 is connected to the output port of the first oil pump 5, and a first one-way valve 62 is provided near the end of the first oil pipeline 6, and a second one-way valve 63 is provided at the other end. The first oil pipeline 6 is connected to the first inlet of the first three-way valve through the second one-way valve 63. One end of a second oil pipeline 8 is connected to the output port of the second oil pump 9, and a third one-way valve 82 is provided near the end of the second oil pipeline 8, and a fourth one-way valve 83 is provided at the other end. The second oil pipeline 8 is connected to the second inlet of the first three-way valve through the fourth one-way valve 83.

[0041] A second three-way valve is installed on the first oil pipeline 6 between the first one-way valve 62 and the second one-way valve 63. A first overflow valve 61 communicating with the first oil pipeline 6 is installed on the second three-way valve. A first branch pipe 611 is installed on the first overflow valve 61, one end of which is connected to the output port of the first overflow valve 61, and the other end is equipped with a first throttle valve 6111. One end of the hydraulic cylinder 7 (i.e., its output shaft) is against the switch of the alarm 3, and the other end (i.e., its input end) is provided with a third three-way valve. The outlet is connected to the input end of the hydraulic cylinder 7, the first inlet is connected to the first throttle valve 6111, a fourth three-way valve is installed on the second oil pipeline 8 between the third one-way valve 83 and the fourth one-way valve 84, the fourth three-way valve is installed with a second relief valve 81 connected to the second oil pipeline 8, the second relief valve 81 is installed on the second branch pipe 811, one end of which is connected to the second relief valve 81 and the other end is installed with a second throttle valve 8111, the second throttle valve 82 is connected to the second inlet of the third three-way valve; Figure 2 As shown, an oil return filter 211 is installed at the oil inlet 21 of the oil tank 2 , the output port of which is connected to the oil outlet 22 of the oil tank 2 , and the input port is connected to the oil outlet pipe 402 on the hydraulic motor 40 .

[0042] Working principle: When the elevator is descending normally, the wire rope drives the pulley 51 to rotate clockwise, and the pulley 51 cooperates with the coupling through the rotating shaft to drive the first oil pump 5 to rotate clockwise. Since the driving gear 52 is engaged with the driven gear 91, the second oil pump 9 rotates counterclockwise (i.e., idling). At this time, the first oil pump 5 draws oil from the oil tank 2 through one of the oil outlets 22, and inputs the oil into the hydraulic motor 40 through the first oil pipeline 6, driving the hydraulic motor 40 to drive the generator 41 to rotate. At this time, the oil is filtered by the return oil filter 211 through the oil outlet pipe 402 and then re-input into the oil tank 2. At the same time, the generator 41 generates electricity and stores it in the battery 42 through the input wire, and the battery 42 will Electric energy is input into the alarm device 3 through the output wire to power the alarm device 3; when the elevator goes down at an excessive speed, the wire rope drives the pulley 51 to rotate faster, and at this time the oil pumping rate of the first oil pump 5 becomes faster. When the oil is output from the oil outlet pipe 402 at the original rate, the pressure in the first oil pipeline 6 continues to rise. After the pressure exceeds the threshold of the first overflow valve 61, a part of the oil passes through the first overflow valve 61, the first branch pipeline 611, and the first throttle valve 6111 and acts on the input end of the hydraulic cylinder 7. In this state, the output shaft of the hydraulic cylinder 7 is pushed outward and squeezes the switch of the alarm device 3. At this time, the alarm device 3 is activated and an alarm is sounded, thereby achieving the purpose of reminding the manager of the elevator failure.

[0043] When the elevator goes up normally, the wire rope drives the pulley 51 to rotate counterclockwise, and the pulley 51 cooperates with the coupling through the rotating shaft to drive the first oil pump 5 to rotate counterclockwise (i.e., idling). Since the driving gear 52 is engaged with the driven gear 91, the second oil pump 9 rotates clockwise. At this time, the second oil pump 9 draws oil from the oil tank 2 through another oil outlet 22, and inputs the oil into the hydraulic motor 40 through the second oil pipeline 8, driving the hydraulic motor 40 to drive the generator 41 to rotate. At this time, the oil is filtered by the return oil filter 211 through the oil outlet pipe 402 and then re-input into the oil tank 2. At the same time, the generator 41 generates electricity and stores it in the battery 42 through the input wire, and the battery 42 transmits the electricity to the oil tank 2. The output wire is input into the alarm 3 to power the alarm 3; when the elevator goes up at an excessive speed, the wire rope drives the pulley 51 to rotate faster, and at this time the oil pumping rate of the second oil pump 9 becomes faster. When the oil is output from the oil outlet pipe 402 at the original rate, the pressure in the first oil pipeline 6 continues to rise. After the pressure exceeds the threshold of the second overflow valve 81, a part of the oil passes through the second overflow valve 81, the second branch pipe 811, and the second throttle valve 8111 and acts on the input end of the hydraulic cylinder 7. In this state, the output shaft of the hydraulic cylinder 7 is pushed outward and squeezes the switch of the alarm 3. At this time, the alarm 3 is activated and an alarm is sounded, thereby achieving the purpose of reminding the manager of the elevator failure.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0045] Although the present invention frequently uses terms such as mounting plate 1, oil tank 2, oil inlet 21, return oil filter 211, oil outlet 22, alarm 3, hydraulic motor 40, oil inlet pipe 401, oil outlet pipe 402, generator 41, battery 42, first oil pump 5, pulley 51, driving gear 52, first oil pipeline 6, first relief valve 61, first branch pipeline 611, first throttle valve 6111, first check valve 62, second check valve 63, hydraulic cylinder 7, second oil pipeline 8, second relief valve 81, second branch pipeline 811, second throttle valve 8111, third check valve 82, fourth check valve 83, second oil pump 9, and driven gear 91, other terms are not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A hydraulic fault alarm system for an elevator, comprising a mounting plate (1) for mounting on the top of an elevator shaft, characterized in that: The mounting plate (1) is provided with an oil tank (2) having an oil inlet (21) and an oil outlet (22), an alarm (3), a hydraulic motor (40), a first oil pump (5), a first oil pipeline (6) and a hydraulic cylinder (7). The mounting plate (1) is also provided with a generator (41) driven by the hydraulic motor (40) and powered by the alarm (3). The oil outlet of the hydraulic motor (40) is connected to the oil inlet (21) and the oil inlet is connected to the first oil pump (5) through the first oil pipeline (6). The first oil pump (5) is connected to the oil outlet (22) and a pulley (51) for connecting a steel wire rope is installed on the pump shaft. The first oil pipeline (6) is connected to the first overflow valve (6) through the second three-way valve. 1), the hydraulic cylinder (7) is connected to the first relief valve (61) and the output shaft is against the switch of the alarm (3), the mounting plate (1) is further mounted with a second oil pipeline (8) and a second oil pump (9) connected to the oil outlet (22), the pump shaft of the first oil pump (5) is provided with a driving gear (52), the pump shaft of the second oil pump (9) is provided with a passive gear (91) meshing with the driving gear (52), one end of the second oil pipeline (8) is connected to the second oil pump (9), and the other end is connected to the oil inlet end of the hydraulic motor (40), and the second oil pipeline (8) is connected to the second relief valve (81) through a fourth three-way connection, and the second relief valve (81) is connected to the hydraulic cylinder (7).

2. The hydraulic fault alarm system for an elevator according to claim 1, characterized in that: A first branch pipe (611) is installed on the first overflow valve (61), one end of the first branch pipe (611) is connected to the output end of the first overflow valve (61), and the other end of the first branch pipe is installed with a first throttle valve (6111) connected to the input end of the hydraulic cylinder (7).

3. The hydraulic fault alarm system for an elevator according to claim 2, characterized in that: A second branch pipe (811) is installed on the second overflow valve (81), one end of the second branch pipe (811) is connected to the output end of the second overflow valve (81), and the other end of the second branch pipe is installed with a second throttle valve (8111) connected to the input end of the hydraulic cylinder (7).

4. The hydraulic fault alarm system for an elevator according to claim 3, characterized in that: A first one-way valve (62) and a second one-way valve (63) are also provided on the first oil pipeline (6), and the first overflow valve (61) is located between the first one-way valve (62) and the second one-way valve (63).

5. The hydraulic fault alarm system for an elevator according to any one of claims 1 to 4, characterized in that: The second oil pipeline (8) is further provided with a third one-way valve (82) and a fourth one-way valve (83), and the second overflow valve (81) is located between the third one-way valve (82) and the fourth one-way valve (83).

6. The hydraulic fault alarm system for an elevator according to claim 5, characterized in that: A battery (42) is also installed on the mounting plate (1). The oil inlet end of the hydraulic motor (40) is provided with an oil inlet pipe (401), and the oil outlet end is provided with an oil outlet pipe (402). The oil inlet pipe (401) is respectively connected to the first oil pipeline (6) and the second oil pipeline (8), and the oil outlet pipe (402) is connected to the oil inlet (21). The battery (42) is respectively connected to the generator (41) and the alarm (3) through wires.

7. The hydraulic fault alarm system for an elevator according to claim 6, characterized in that: An oil return filter (211) is installed on the oil inlet (21), and the oil outlet pipe (402) is connected to the oil inlet (21) through the oil return filter (211).

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