Device for measuring rod falling time of driving mechanism

Abstract

The utility model relates to the technical field of nuclear power devices and test devices, in particular to a device for measuring rod falling time of a driving mechanism, which mainly comprises a driving mechanism load simulation piece, a shell, a buffer assembly, a force sensor, a falling sensing unit and a processing unit. The driving mechanism load simulation piece is hereinafter referred to as a load simulation piece, the force sensor is arranged in the buffer assembly, the buffer assembly is arranged on the lower portion of the shell, and the falling sensing unit is arranged on the upper portion of the shell and used for feeding back whether the driving mechanism load simulation piece starts to fall or not. In the using process, the shell is filled with water, a large amount of buffering is provided when the load simulation piece falls, then the buffering assembly can conduct buffering again, and the problem that the impact force is large when the rod falls is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power device and test device technical field, specifically, relate to a device for measuring drive mechanism rod drop time. BACKGROUND

[0002] The control rod drive mechanism (referred to as drive mechanism) is the execution mechanism of the reactor control system and protection system. It is the key component in the reactor, which drives the control rod assembly to move up and down in the core, realizes the control of the reactor reactivity, and thus completes the start-up, power regulation, power maintenance, normal shutdown and safety shutdown of the reactor. With the improvement of the reliability of the key equipment of the reactor, the service life requirement of the drive mechanism is also higher and higher. Through the development of the thermal state life test of the drive mechanism, the life and performance of the vulnerable parts can be evaluated, the operation performance of the drive mechanism can be tested, and the structure improvement and optimization of the key components have important significance.

[0003] The drive mechanism has design indicators for the lifting force in the design. In order to ensure the good state of the drive mechanism, it is required that the stress condition of the drive mechanism is good. The stress includes the stress under two working conditions, i.e. the stress in operation and the impact when the rod drops. The two forces have certain correlation. When the pulling and inserting force is large, the rod drop impact force is usually small. When the drive mechanism is running back and forth, the resistance is large, and the wear of the bearing / hook jaw clamping lead screw / drive rod parts will be more serious. When the rod drop impact force is large, it means that the resistance in the falling process is small, and the hydraulic buffering effect is poor, which will cause the drive mechanism parts to be subjected to a large reverse impact, which is not conducive to the stability and long-term reliability of the structure. The balance of the two stresses can usually be measured by the length of the rod drop time. If the rod drop time is long, the hydraulic buffering is large, the pulling and inserting force is large, and the rod drop impact force is small. If the rod drop time is short, the hydraulic buffering is small, the pulling and inserting force is small, and the rod drop impact force is large.

[0004] However, in the prior art, when simulating the control rod assembly, the impact force is usually large when the rod drops, and a good state cannot be provided for the operation of the test. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a device for measuring the rod drop time of the drive mechanism to solve the problem of large impact force when the rod drops in the prior art.

[0006] The utility model realizes the following technical scheme:

[0007] A device for measuring the drop time of a drive mechanism includes a drive mechanism load simulator (hereinafter referred to as the load simulator), a housing, a buffer assembly, a force sensor, a drop sensing unit, and a processing unit. The force sensor is disposed within the buffer assembly, which is located at the bottom of the housing. The drop sensing unit is located at the top of the housing and is used to provide feedback on whether the load simulator has dropped. The drop sensing unit and the force sensor are electrically connected to the processing unit, which is used to record the data from the drop sensing unit and the force sensor.

[0008] Preferably, the drop sensing unit includes a Hall sensor and a magnet. The Hall sensor is disposed on the top of the housing, and the magnet is disposed on one side of the load simulation component and is positioned at the same height as the Hall sensor.

[0009] Preferably, a height adjustment device is further provided between the Hall sensor and the housing, the height adjustment device being used to control the height of the Hall sensor.

[0010] Preferably, the height adjustment device includes a base and a telescopic rod, one end of the telescopic rod is connected to the base and the other end is connected to the Hall sensor, and the base is connected to the top of the housing.

[0011] Preferably, it also includes a hoisting device, which is disposed on the housing and one end of which is used to fix the load simulation component.

[0012] Preferably, the hoisting device includes a fixed rod, a connecting rod, and a clamp. One end of the fixed rod is connected to the housing, and the other end is connected to the clamp. The other end of the clamp is connected to the connecting rod. The connecting rod is connected to the load simulation component. The clamp is used to fix and release the load simulation component.

[0013] Preferably, the vertical projection of the connecting rod is located within the buffer assembly.

[0014] Preferably, the force sensor is provided with a waterproof housing.

[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] The structure of this invention mainly includes a load simulation component with a drive mechanism, a housing, a buffer assembly, a force sensor, a drop sensing unit, and a processing unit. The force sensor is located inside the buffer assembly, which is situated at the bottom of the housing. The drop sensing unit is located at the top of the housing and is used to provide feedback on whether the load simulation component has started to fall. During use, the housing is filled with water, providing substantial cushioning when the load simulation component falls. Furthermore, the buffer assembly provides additional cushioning to prevent excessive impact force during the drop.

[0017] By obtaining the voltage signal change time when the rod leaves the initial position and the time when the force signal is at its maximum when the rod falls to the bottom, the time required for the rod falling process can be obtained, with high acquisition accuracy.

[0018] This structure allows for the measurement of the drop bar time of the drive mechanism within the test body without the need for a test piece. The device is simple in structure, easy to operate, and cost-effective.

[0019] This structure not only obtains the time of bar drop but also the impact force during the drop. By installing a force gauge on the hoisting tool, the insertion and withdrawal force of the load simulation component during operation can also be obtained, making it a multi-functional integrated method.

[0020] This structure allows for the measurement of impact force and drop time at different drop heights. Simply adjust the height of the Hall switch sensor to the desired position; the operation is simple and convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the initial state structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the drive mechanism of this utility model falling to the bottom;

[0024] Figure 3 This is a schematic diagram of the sensor data of this utility model.

[0025] Icons: 1-Connecting rod, 2-Fixing rod, 3-Magnet, 4-Housing, 5-Force sensor, 6-Buffer assembly, 7-Hall sensor, 8-Clamp, 9-Load simulation component. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Please refer to Figures 1-2This utility model provides a device for measuring the drop time of a drive mechanism, comprising a drive mechanism load simulation component (hereinafter referred to as load simulation component 9), a housing 4, a buffer assembly 6, a force sensor 5, a drop sensing unit, and a processing unit. The force sensor 5 is disposed within the buffer assembly 6, which is located at the bottom of the housing 4. The drop sensing unit is located at the top of the housing 4 and is used to provide feedback on whether the load simulation component 9 has dropped. The drop sensing unit and the force sensor 5 are electrically connected to the processing unit, which is used to record the data from the drop sensing unit and the force sensor 5. The buffer assembly 6 can be a hollow cylindrical structure with a sponge inside, and the force sensor 5 can be disposed at the bottom of the sponge, as long as it can provide a buffering effect.

[0028] The structure of this invention mainly includes a load simulation component with a drive mechanism, a housing 4, a buffer assembly 6, a force sensor 5, a drop sensing unit, and a processing unit. The force sensor 5 is disposed within the buffer assembly 6, which is located at the bottom of the housing 4. The drop sensing unit is located at the top of the housing 4 and is used to provide feedback on whether the load simulation component 9 has started to fall. During use, the housing 4 is filled with water, providing substantial cushioning when the load simulation component 9 falls. Furthermore, the buffer assembly 6 provides additional cushioning to prevent excessive impact force during the drop.

[0029] Specifically, the fall sensing unit includes a Hall sensor 7 and a magnet 3. The Hall sensor 7 is disposed on the top of the housing 4, and the magnet 3 is disposed on one side of the load simulation component 9 and is disposed at the same height as the Hall sensor 7.

[0030] In use, the load simulator 9 is used to contact the impact surface of the drop bar, where a force sensor 5 is placed and the signal line is led out from the bottom of the container. According to the design stroke of the load simulator 9, a magnet 3 is placed on the upper outer surface of the load simulator 9, and a Hall switch sensor is placed at the same external elevation. The force sensor 5 signal and the Hall switch signal are simultaneously connected to the data acquisition system. After the container is filled with water, the load simulator 9 is raised to the required height, and the Hall switch signal and the force sensor 5 signal are collected when the drive rod is released.

[0031] The force sensor 5 should be arranged in the axial direction to improve the measurement sensitivity. At the same time, in order to protect the sensor itself from damage by the impact force of the load simulation component, it should not be in direct contact with the load simulation component.

[0032] The Hall switch arrangement is quite flexible. As long as the Hall switch is on in the initial position and off the moment the bar is lowered, it's sufficient. Magnet 3 can be attached to the outer wall of the load simulation component 9 for easy assembly and disassembly. The sensor components can be adjusted according to different bar lifting height requirements.

[0033] Signals from both channels must be acquired simultaneously without any time delay. A force gauge is installed between the load simulator 9 and the lifting tool to obtain the insertion / extraction resistance during lifting / lowering.

[0034] The load simulation component 9 can be instantly disengaged from the lifting tool by means of a pin. During operation, the data acquisition system should be run first, and then the load simulation component 9 should be disengaged.

[0035] When the hoisting tool separates from the simulated load of the load simulator 9, the simulated load begins to fall. The distance between the Hall switch sensor and the magnet 3 mounted on the outer surface of the load simulator 9 increases, and the output voltage signal of the Hall switch sensor disappears. This moment can be determined as the starting point of the falling bar, i.e., the attachment... Figure 3 At time t1 in the data.

[0036] During the descent of the load simulation component 9, the water impact is transmitted to the force sensor 5. The force is greatest on the sensor as the component approaches the bottom, and this moment can be used to determine when the component hits the bottom. Figure 3 At time t2, the time of bar drop is t = t2 - t1.

[0037] In one exemplary embodiment of this utility model, a height adjustment device is further provided between the Hall sensor 7 and the housing 4, the height adjustment device being used to control the height of the Hall sensor 7.

[0038] Specifically, the height adjustment device includes a base and a telescopic rod. One end of the telescopic rod is connected to the base, and the other end is connected to the Hall sensor 7. The base is connected to the top of the housing 4.

[0039] An exemplary embodiment of this utility model further includes a hoisting device, which is disposed on the housing 4, one end of which is used to fix and load the simulation component 9.

[0040] Specifically, the hoisting device includes a fixed rod 2, a connecting rod 1, and a clamp 8. One end of the fixed rod 2 is connected to the housing 4, and the other end is connected to the clamp 8. The other end of the clamp 8 is connected to the connecting rod 1, and the other end of the connecting rod 1 is connected to the load simulation component 9. The clamp 8 is used to fix and release the load simulation component 9.

[0041] Furthermore, the vertical projection of the connecting rod 1 is located within the buffer assembly 6. Since the housing 4 needs to be filled with water, a waterproof housing can be provided outside the force sensor 5.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring drive mechanism drop bar time, characterized by, The device comprises a shell (4), a buffer assembly (6), a force sensor (5), a falling sensing unit and a processing unit, the force sensor (5) is arranged in the buffer assembly (6), the buffer assembly (6) is arranged at the lower part of the shell (4), the falling sensing unit is arranged at the upper part of the shell (4) and is used for feeding back whether the load simulation piece (9) falls, the falling sensing unit and the force sensor (5) are electrically connected with the processing unit respectively, and the processing unit is used for recording the data of the falling sensing unit and the force sensor (5).

2. The device for measuring the drop bar time of a drive mechanism according to claim 1, wherein, The falling sensing unit comprises a Hall sensor (7) and a magnet (3), the Hall sensor (7) is arranged at the top of the shell (4), and the magnet (3) is arranged at the upper part of the load simulation piece (9) and is arranged at the same height as the Hall sensor (7).

3. A device for measuring drive mechanism drop bar time according to claim 2, wherein, The height adjusting device is arranged between the Hall sensor (7) and the shell (4) and is used for controlling the height of the Hall sensor (7).

4. The device for measuring the drive mechanism drop bar time according to claim 3, characterized in that, The height adjusting device comprises a base and a telescopic rod, one end of the telescopic rod is connected with the base, the other end is connected with the Hall sensor (7), and the base is connected with the top of the shell (4).

5. The device for measuring the drop time of a drive rod according to claim 1, wherein, The device further comprises a hoisting device, the hoisting device is arranged above the shell (4), and one end of the hoisting device is used for fixing the load simulation piece (9).

6. A device for measuring drive mechanism drop bar time according to claim 5, wherein, The hoisting device comprises a fixing rod (2), a connecting rod (1) and a clamp (8), one end of the fixing rod (2) is connected with the shell (4), the other end is connected with the clamp (8), the other end of the clamp (8) is connected with the connecting rod (1), the connecting rod (1) is connected with the load simulation piece (9), and the clamp (8) is used for fixing and releasing the load simulation piece (9).

7. A device for measuring drive mechanism drop bar time according to claim 6, wherein, The vertical projection of the connecting rod (1) is located in the buffer assembly (6).

8. The device for measuring the drive mechanism drop bar time according to claim 7, characterized in that, The force sensor (5) is externally provided with a waterproof shell.

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