Hydropower station jack static load test device

Abstract

A hydropower station jack static load test device comprises an electric hydraulic station and a bottom plate, the bottom plate is fixedly connected with a top plate through a plurality of guide rods, a pressing plate is assembled on the guide rods, a jack to be tested is placed on the pressing plate, a force sensor is arranged between the pressing plate and the bottom plate, a hydraulic cylinder is installed on the top plate, and the electric hydraulic station comprises an electromagnetic valve. The force sensor is connected with the input end of the controller, and the electromagnetic valve is connected with the output end of the controller. According to the utility model, during the static load test of the jack, the magnitude of the force applied to the jack can be monitored in real time, and the operation is simpler.

Description

Technical Field

[0001] The utility model relates to a static load test device for a hydroelectric power station jack. Background Art

[0002] In the overhaul and maintenance work of hydroelectric power stations, jacks are widely used as lifting tools. In actual use, the commonly used screw jacks and hydraulic pistons cannot monitor the actual load of the jacks, and over-range use may occur. The usage environment of jacks in hydroelectric power stations is complex, and the jacks may be fatigued and damaged during use. In actual production, except for visual inspection, no relevant inspection work can be carried out, thus posing potential safety hazards. To solve this technical problem, corresponding solutions have also been proposed in the prior art. For example, CN110631829A discloses a static load test bench for a jack, which checks and changes the applied force through a crossbeam and a limiting member, but cannot monitor the magnitude of the force finitely, and has relatively high requirements for the fatigue strength of the crossbeam and the limiting member, and the operation is also relatively complex. Content of the Utility Model

[0003] The purpose of the utility model is to provide a static load test device for a hydroelectric power station jack, which can monitor the magnitude of the force applied to the jack in real time during the static load test of the jack, and the operation is simpler.

[0004] To solve the above problems, the technical solution of the utility model is as follows:

[0005] A static load test device for a hydroelectric power station jack includes an electro-hydraulic station and a bottom plate. The bottom plate is fixedly connected to a top plate through a plurality of guide rods. A pressing plate is assembled on the guide rods, and the jack to be tested is placed on the pressing plate. A force sensor is arranged between the pressing plate and the bottom plate. A hydraulic cylinder is installed on the top plate. The electro-hydraulic station includes a solenoid valve. The hydraulic cylinder is connected to the solenoid valve. The force sensor is connected to the input end of a controller, and the solenoid valve is connected to the output end of the controller.

[0006] A support plate is assembled on the guide rods, and springs are sleeved on each guide rod. The two ends of the springs respectively abut against the support plate and the pressing plate.

[0007] It further includes a display screen, and the display screen is connected to the controller.

[0008] An adjustable one-way throttle valve is installed on the oil path where the hydraulic cylinder is connected to the solenoid valve.

[0009] The beneficial effects of the utility model are as follows:

[0010] 1. This device is an integrated mechanical, electrical and hydraulic test device with high precision and high automation degree;

[0011] 2. The jack support device is simple, lightweight, and easy to move. In addition to being used as a static test device, it can also be used independently, with a wide range of application scenarios.

[0012] 3. In addition to using a controller to control the actual load, a force sensor is set at the bottom to facilitate the verification and monitoring of the applied load.

[0013] 4. The four-column frame structure is adopted, with balanced stress and high structural safety.

[0014] 5. Universal wheels are set at the bottom of the frame to facilitate on-site mobile detection.

[0015] 6. The device is easy to set up. In addition to being used for the static test of the jack, it can also be used in various scenarios such as the pressure holding test of the unit piston brake, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes the present utility model with reference to the accompanying drawings:

[0017] Figure 1 is a schematic structural diagram of the present utility model,

[0018] Figure 2 is a working principle diagram of the present utility model.

[0019] In the figure: hydraulic cylinder 1, top plate 2, guide rod 3, support plate 4, spring 5, jack 6, bottom plate 7, force sensor 8, universal wheel 9, solenoid valve 10, electro-hydraulic station 11, controller 12, display screen 13, adjustable one-way throttle valve 14, pressing plate 15. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] A static load test device for a jack 6 in a hydropower station, comprising an electro-hydraulic station 11 and a bottom plate 7. The bottom plate 7 is fixedly connected to a top plate 2 through four guide rods 3. A pressure plate 15 is assembled on the guide rods 3. The pressure plate 15 can move up and down along the guide rods 3. The jack 6 to be tested is placed on the pressure plate 15. A force sensor 8 is arranged between the pressure plate 15 and the bottom plate 7. A hydraulic cylinder 1 is installed on the top plate 2. The electro-hydraulic station 11 includes a three-position four-way solenoid valve 10. The hydraulic cylinder 1 is connected to the solenoid valve 10. The force sensor 8 is connected to the input end of a controller 12, and the solenoid valve 10 is connected to the output end of the controller 12. The controller 12 is a TPC8-8 timing program controller 12. It also includes a liquid crystal display screen 13. The display screen 13 is connected to the controller 12 through an RS232 cable. The liquid crystal display screen 13 is used to display the weight data transmitted by the force sensor 8 and to display in real time a curve with weight and time as coordinates. A hydraulic cylinder 1 feed button SB1, a hydraulic cylinder 1 retraction button SB2, and a hydraulic station start / stop button SB3 are also connected to the input end of the controller 12.

[0022] When the utility model is in use, the jack 6 to be tested is placed on the pressure plate 15, and then the electro-hydraulic station 11 is started. Then, the piston rod of the hydraulic cylinder 1 is controlled to move downward so that the piston rod presses on the jacking rod of the jack 6 to apply a load to the jack 6. At the same time, the load weight is observed in real time through the liquid crystal screen. When the weight reaches the set weight, the controller 12 controls the three-position four-way solenoid valve 10 to return to the middle position to maintain pressure on the hydraulic cylinder 1. After maintaining pressure for 3 minutes, the hydraulic cylinder 1 is controlled to retract, and then whether there are abnormalities in the jack 6, such as bending of the jacking rod and cracking of the nut, is observed through the curve.

[0023] A support plate 4 is assembled on the guide rods 3. Springs 5 are sleeved on each of the guide rods 3. The two ends of the springs 5 respectively abut against the support plate 4 and the pressure plate 15. The support plate 4 can increase the pressure application surface of the hydraulic cylinder 1 to ensure that the pressure can be applied vertically to the jack 6 and prevent the jack 6 from being deflected. After the test is completed and the piston rod of the hydraulic cylinder 1 retracts, the spring 5 pushes the support plate 4 away from the jack 6, facilitating the staff to take out the jack 6.

[0024] An adjustable one-way throttle valve 14 is installed on the oil path connecting the hydraulic cylinder 1 and the solenoid valve 10. The adjustable one-way throttle valve 14 can conveniently adjust the feeding speed of the hydraulic cylinder 1. Especially in the latter stage of the downward movement of the hydraulic cylinder 1, the flow rate of the hydraulic oil can be reduced through the adjustable one-way throttle valve 14 to slow down the downward movement speed of the hydraulic cylinder 1, facilitating the precise control of the load applied to the jack 6.

[0025] A plurality of universal wheels 9 are installed at the bottom of the bottom plate 7. It is convenient to move the test device.

[0026] The content described in the embodiments of this specification is only an enumeration of the implementation forms of the utility model concept. The protection scope of the present utility model should not be regarded as limited to the specific forms stated in the embodiments, and the protection scope of the present utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the utility model concept.

Claims

1. A static load test device for a hydropower station jack, characterized in that: The invention comprises an electric hydraulic station (11) and a bottom plate (7), wherein the bottom plate (7) is fixedly connected to a top plate (2) via a plurality of guide rods (3), a pressure plate (15) is mounted on the guide rods (3), a jack (6) to be tested is placed on the pressure plate (15), a force sensor (8) is arranged between the pressure plate (15) and the bottom plate (7), a hydraulic cylinder (1) is mounted on the top plate (2), the electric hydraulic station (11) comprises a solenoid valve (10), the hydraulic cylinder (1) is connected to the solenoid valve (10), the force sensor (8) is connected to an input end of a controller (12), and the solenoid valve (10) is connected to an output end of the controller (12).

2. A hydropower station jack static load test device according to claim 1, characterized in that: It also includes a display screen (13), which is connected to the controller (12).

3. A hydropower station jack static load test device according to claim 1, characterized in that: A support plate (4) is mounted on the guide rod (3), and a spring (5) is sleeved on each guide rod (3), with two ends of the spring (5) respectively resting on the support plate (4) and the pressure plate (15).

4. A hydropower station jack static load test device according to claim 1, characterized in that: An adjustable one-way throttle valve (14) is installed on the oil path connecting the hydraulic cylinder (1) to the solenoid valve (10).

5. A hydropower station jack static load test device according to claim 1, characterized in that: A plurality of universal wheels (9) are installed at the bottom of the base plate (7).

Images