Secondary neutron source assembly pressure spring stiffness measuring device and measuring method

Abstract

The invention discloses a secondary neutron source assembly pressure spring rigidity measuring device which comprises a measuring unit and a fixing unit. The measuring unit comprises a driving mechanism, a driving plate, a pressing plate and a positioning seat, the driving mechanism can drive the driving plate to move in the linear direction, the pressing plate can be driven by the driving plate to extrude the pressing spring, and a pressure sensor and a displacement sensor are further arranged between the driving plate and the pressing plate; the driving mechanism is arranged on the positioning seat; the fixing unit comprises a base and a cam mechanism, the pressure spring is fixed in the base, the positioning seat of the measuring unit is configured on the base, the positioning seat is provided with an inclined surface part, the cam mechanism is provided with a cam part capable of rotating, and the cam part can rotate from the low-position end to the high-position end of the inclined surface part. And the positioning seat is pressed on the base. According to the invention, secondary neutron source assembly pressure spring rigidity measurement is realized, and the problem of spring return jumping can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power generation device testing, and in particular to a secondary neutron source component compression spring stiffness measuring device and a measuring method. Background Art

[0002] The secondary neutron source assembly is inserted into the fuel assembly. Its function is to increase the core neutron flux to a certain level when the reactor is restarted, so that the nuclear measuring instrument can measure the rapid change of neutron flux during startup, thereby ensuring the rapid startup of the reactor. The compression spring is an important component of the secondary neutron source assembly. It is located at the top of the assembly and can press the neutron source assembly against the upper grid of the fuel assembly to overcome the hydraulic impact during the operation of the reactor, compensate for the thermal expansion difference between the fuel assembly and the compression component, so that the neutron source assembly always maintains reliable contact with the fuel assembly. Under the irradiation conditions in the pile, the stiffness of the compression spring will inevitably change. In the process of developing a compression spring material, it is necessary to measure the stiffness of the compression spring after several irradiation test cycles to verify the irradiation performance of the material.

[0003] A Chinese patent (publication number: CN108871959A) discloses a device and method for measuring the nonlinear stiffness of a spent fuel assembly compression plate spring. The device can simultaneously measure the comprehensive stiffness of four groups of compression plate springs on the upper tube seat in the spent fuel grid, but the device measures the plate springs around the spent fuel assembly grid, and cannot measure the stiffness of the spiral spring at the top of the secondary neutron source assembly; at the same time, the patent uses a method of four claws buckling the inside of the grid to offset the reaction force of the spring during measurement, but the relative position of the secondary neutron source assembly spring and the grid determines that it cannot prevent the assembly from jumping in a similar way. Summary of the invention

[0004] The purpose of the present invention is to provide a secondary neutron source component compression spring stiffness measurement device and a measurement method to address the problem that the stiffness of the secondary neutron source component spring cannot be tested in the prior art. The device and a measurement method can measure the stiffness of the compression spring of the secondary neutron source component after irradiation and effectively avoid the secondary neutron source component from jumping.

[0005] The present invention is achieved through the following technical solutions:

[0006] A secondary neutron source component compression spring stiffness measuring device comprises a measuring unit and a fixing unit;

[0007] The measuring unit comprises a driving mechanism, a driving plate, a clamping plate and a positioning seat, wherein the driving mechanism can drive the driving plate to move in a straight line direction, the clamping plate can be driven by the driving plate to compress the clamping spring, and a pressure sensor and a displacement sensor are also arranged between the driving plate and the clamping plate; the driving mechanism is arranged on the positioning seat;

[0008] The fixing unit includes a base and a cam mechanism, the pressing spring is fixed in the base, the positioning seat of the measuring unit is arranged on the base, the positioning seat is provided with an inclined portion, and the cam mechanism is provided with a rotatable cam component, and the cam component can rotate from the low end to the high end of the inclined portion to press the positioning seat against the base.

[0009] Optionally, the secondary neutron source assembly includes a cylindrical part, a spring seat and the compression spring, wherein the compression spring is sleeved on the cylindrical part, the bottom of the compression spring is fixed to the spring seat, the cylindrical part is also sleeved with an annular part, the bottom of the compression plate is fixed with a cylindrical part, the compression plate can squeeze the annular part sleeved on the cylindrical part through the cylindrical part, thereby squeezing the compression spring, and the spring seat is positioned in the base by a positioning pin.

[0010] Optionally, the positioning seat adopts a square structure, the inclined portion is arranged on the upper edges of two opposite sides of the positioning seat, and the lower end of the inclined portion is arranged at a position close to the end of the upper edge of the side, and the high end is arranged at a position close to the middle of the upper edge of the side, and has a distance of 3-5 cm from the center position.

[0011] Optionally, the cam mechanism comprises a camshaft, an end of the camshaft is provided with a lifting bolt, the camshaft is mounted on a frame via a bearing, and the cam component is fixed on the camshaft.

[0012] Optionally, the cam mechanism comprises a camshaft and a sleeve, the sleeve is sleeved on the camshaft, the cam component is fixed on the sleeve, a first bevel gear is arranged on the sleeve, a lug bolt is arranged at the shaft end of the camshaft, a first magnetic component is arranged on one side of the lug bolt, and the first magnetic component is arranged along the circumferential direction;

[0013] The secondary neutron source assembly compression spring stiffness measuring device also includes a rotating fixture, which includes an L-shaped rod, a short arm portion of the L-shaped rod is provided with a guide sleeve, a second magnetic component that can move along the guide sleeve is sleeved on the guide sleeve, a radially arranged accommodating cavity is also provided on the guide sleeve, a limiting component is provided in the accommodating cavity, a ventilation channel is provided in the middle of the L-shaped rod, one end of the ventilation channel is connected to the accommodating cavity, and the other end of the ventilation channel extends to the end of the long arm portion of the L-shaped rod, and a movable piston component is provided at the end of the long arm portion, which can drive the limiting component to move in the accommodating cavity when moving in the ventilation channel, and the limiting component extends out of the accommodating cavity to limit the L-shaped rod from withdrawing from the ear bolt; the short arm portion of the L-shaped rod is also sleeved with a second bevel gear, and the second bevel gear can mesh with the first bevel gear when the short arm portion of the L-shaped rod extends into the ear bolt, and a ratchet pawl assembly is also provided between the second bevel gear and the L-shaped rod.

[0014] Optionally, the first magnetic component and the second magnetic component both use a plurality of permanent magnets arranged along the circumferential direction of the axis of the eye bolt.

[0015] Optionally, a rubber pad is further provided between the positioning seat and the base.

[0016] Optionally, the driving mechanism includes a motor, a gear transmission assembly and a screw-nut assembly, the motor drives the screw of the screw-nut assembly to rotate through the gear transmission assembly, and the nut of the screw-nut assembly is fixed to the driving plate to drive the driving plate to move.

[0017] Optionally, the driving mechanism further comprises a manual driving shaft, the manual driving shaft is sleeved with a manual gear, and the manual gear is meshed with the screw nut assembly.

[0018] A measurement method based on the secondary neutron source assembly compression spring stiffness measurement device comprises the following steps:

[0019] S1. Install the secondary neutron source assembly in the base of the fixed unit;

[0020] S2. Hoist the measuring unit onto the fixed unit, and use the long positioning pin of the positioning seat to position and install it on the base of the fixed unit;

[0021] S3, rotating the cam components on both sides of the base of the fixing unit along the inclined surface on the positioning seat to the inner side of the base, locking the base and the positioning seat, and fixing the measuring unit and the fixing unit;

[0022] S4. Start the driving mechanism to drive the driving plate to move. The driving plate drives the clamping plate to move through the power transmission of the pressure sensor and the displacement sensor to compress the clamping spring. When the pressure sensor has a reading, the displacement sensor starts to record the displacement. The compression force is obtained through the pressure sensor, and the compression displacement is obtained through the displacement sensor. The stiffness of the clamping spring is calculated based on the compression force data and the displacement data.

[0023] The technical solution of the present invention has at least the following beneficial effects:

[0024] The secondary neutron source assembly compression spring stiffness measuring device and measurement method of the present invention can achieve relative fixation of the measuring unit and the fixing unit by means of rotational cooperation of a cam mechanism, thereby effectively avoiding the situation that the compression spring may drive the secondary neutron source assembly to move upward and jump or even leave the base under the action of the restoring force during the stiffness measurement process, thereby ensuring the stability of the measurement process;

[0025] The present invention drives a driving plate and a clamping plate to move downward through a driving mechanism, compresses a clamping spring through the clamping plate, and outputs real-time displacement and compression force of the compression process through a displacement sensor and a pressure sensor, thereby realizing measurement of the stiffness of the clamping spring of a secondary neutron source assembly on an existing bench in a spent pool loading well. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a device for measuring the stiffness of a compression spring of a secondary neutron source assembly of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the measuring unit of the present invention;

[0028] Figure 3 is a cross-sectional view of a measuring unit of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the fixing unit of the present invention;

[0030] Figure 5 is a cross-sectional view of the rotating fixture of the present invention;

[0031] Icons: 100-measuring unit, 110-driving mechanism, 111-motor, 112-gear transmission assembly, 113-manual driving shaft, 114-screw nut assembly, 120-driving plate, 130-pressing plate, 140-positioning seat, 150-displacement sensor, 160-pressure sensor, 170-cylinder component, 200-fixing unit, 210-base, 220-cam mechanism, 221-camshaft, 222-cam component, 223-eye bolt, 224-camshaft, 225-camshaft, 226-camshaft, 227-camshaft, 228-camshaft, 229-camshaft, 230-camshaft, 231-camshaft, 232-camshaft, 233-camshaft, 234-camshaft, 235-camshaft, 236-camshaft, 237-camshaft, 238-camshaft, 239-camshaft, 240-camshaft, 241-camshaft, 242-camshaft, 243-camshaft, 244-camshaft, 245-camshaft, 246-camshaft, 247-camshaft, 248-camshaft, 249-camshaft, 250-camshaft, 251-camshaft, 252-camshaft, 253-camshaft, 254-camshaft, 255-camshaft, 256-camshaft, 257-camshaft, 258-camshaft, 259-camshaft, 260-camshaft, 261-camshaft, 26 4-first bevel gear, 225-sleeve, 226-first magnetic component, 300-stand, 400-secondary neutron source assembly, 410-annular component, 420-cylindrical component, 430-compression spring, 440-spring seat, 500-rotation fixture, 510-L-shaped rod, 511-piston component, 512-ventilation channel, 520-guide sleeve, 530-second bevel gear, 540-ratchet pawl assembly, 550-limiting component, 560-second magnetic component. DETAILED DESCRIPTION

[0032] Example 1

[0033] Reference Figure 1-4 The stiffness measuring device of the compression spring 430 of the secondary neutron source assembly 400 of the present invention comprises a measuring unit 100 and a fixing unit 200, wherein the secondary neutron source assembly 400 comprises a cylindrical component 420, a spring seat 440 and a compression spring 430, the compression spring 430 is sleeved on the cylindrical component 420, the bottom of the compression spring 430 is fixed to the spring seat 440, an annular component 410 is also sleeved on the cylindrical component 420, and the cylindrical component 420 is fixed to the spring seat 440. When the measuring unit 100 is tested, the compression and fixation of the compression spring 430 can be achieved by squeezing the annular component 410 and transmitting the force to the compression spring 430 through the annular component 410. As long as the cylindrical component 420 and the spring seat 440 are kept fixed, the compression spring 430 can be kept compressed along the cylindrical component 420, ensuring that the compression spring 430 moves axially to avoid distortion.

[0034] Reference Figure 2 , Figure 3The measuring unit 100 includes a driving mechanism 110, a driving plate 120, a clamping plate 130 and a positioning seat 140. The driving mechanism 110 can drive the driving plate 120 to move in a straight line direction. The clamping plate 130 can be driven by the driving plate 120 to squeeze the clamping spring 430. A pressure sensor 160 and a displacement sensor 150 are also arranged between the driving plate 120 and the clamping plate 130. The driving mechanism 110 is arranged on the positioning seat 140. A cylindrical part 170 is arranged at the bottom of the clamping plate 130. The clamping plate 130 can squeeze the annular part 410 sleeved on the cylindrical part 420 through the cylindrical part 170, thereby squeezing the clamping spring 430. The measuring unit 100 provides linear motion power through the driving mechanism 110, thereby driving the driving plate 120 to move in a straight line. The driving plate 120 and the clamping plate 130 are connected together through the pressure sensor 160 and the displacement sensor 150. In this way, when the driving plate 120 moves, it can also drive the clamping plate 130 to move together. Before contacting the clamping spring 430, due to the lack of resistance, the driving plate 120 and the clamping plate 130 maintain synchronous movement, so that there is no change in the reading of the pressure sensor 160 and the displacement sensor 150. After the clamping plate 130 contacts the clamping spring 430, the pressure sensor 160 will first change its reading. At this time, the displacement sensor 150 starts to record the displacement, and the compression force is obtained through the pressure sensor 160, the compression displacement is obtained through the displacement sensor 150, and the stiffness of the current spring is obtained through the control cabinet computer.

[0035] Reference Figure 1 , Figure 4 In order to prevent the compression spring 430 from driving the secondary neutron source assembly 400 to move upward and jump under the action of the restoring force, the present embodiment is further provided with a fixing unit 200, the fixing unit 200 includes a base 210 and a cam mechanism 220, the base 210 is fixed on a frame 300, the middle of the base 210 is a hollow structure, which can accommodate the secondary neutron source assembly 400, the compression spring 430 of the secondary neutron source assembly 400 is fixed in the base 210, further, the compression spring 430 is positioned in the base 210 by means of a spring seat 440 through a positioning pin. Figure 1 The positioning seat 140 of the measuring unit 100 is arranged on the base 210, and a sloped portion is provided on the positioning seat 140. The cam mechanism 220 is provided with a rotatable cam component 222, and the cam component 222 can rotate from the lower end to the upper end of the sloped portion to press the positioning seat 140 against the base 210. Further, the positioning seat 140 adopts a square structure, and the sloped portion is arranged at the upper edges of two opposite sides of the positioning seat 140, and the lower end of the sloped portion is arranged at a position close to the end of the upper edge of the side surface, and the upper end is arranged at a position close to the middle of the upper edge of the side surface, and has a distance of 3-5 cm from the center position.

[0036] During measurement, the entire measuring unit 100 is hoisted above the base 210 by the hoisting mechanism, so that the positioning seat 140 of the measuring unit 100 can be assembled above the base 210, and the positioning seat 140 is positioned on the base 210 of the fixing unit 200 by using the positioning long pin of the positioning seat 140, and then the cam mechanism 220 is rotated to move the cam component 222 along the low end of the inclined portion to the high end, gradually pressing the positioning seat 140, and finally the cam component 222 can be positioned to the central position, thereby fixing the positioning seat 140 and the base 210. The design position of the inclined portion, including its terminal position, can ensure that the cam component 222 can well maintain the pressing relationship between the positioning seat 140 and the base 210. In addition, the cam component 222 of the present invention utilizes the side of the cam component 222 to achieve extrusion. The side of the cam component 222 is a planar structure, which is finally pressed against the surface of the positioning, and also achieves plane matching, ensuring that the contact between the two is a good planar structure, avoiding the problem of unstable contact on the inclined portion, so the high end of the inclined surface is selected to be 3-5 cm away from the center position.

[0037] The cam mechanism 220 includes a camshaft 221, and a lifting bolt 223 is provided at the end of the camshaft 221. The camshaft 221 is installed on a frame 300 through a bearing. The cam component 222 is fixed on the camshaft 221. The lifting bolt 223 can be inserted into a long-handled tool and then rotated to realize the rotation of the cam component 222, thereby realizing the fixing work of the positioning seat 140 and the base 210 mentioned above.

[0038] The driving mechanism 110 includes a motor 111, a gear transmission assembly 112 and a screw nut assembly 114. The motor 111 drives the screw of the screw nut assembly 114 to rotate through the gear transmission assembly 112. The nut of the screw nut assembly 114 is fixed to the driving plate 120 to drive the driving plate 120 to move.

[0039] The driving mechanism 110 further includes a manual driving shaft 113 , on which a manual gear is sleeved. The manual gear is meshed with a screw nut assembly 114 , and can be controlled manually or automatically.

[0040] A measurement method based on a stiffness measurement device of a compression spring 430 of a secondary neutron source assembly 400 comprises the following steps:

[0041] S1. Install the secondary neutron source assembly 400 in the base 210 of the fixing unit 200;

[0042] S2, hoisting the measuring unit 100 onto the fixing unit 200, and using the long positioning pins of the positioning seat 140 to position and install it onto the base 210 of the fixing unit 200;

[0043] S3, rotating the cam components 222 on both sides of the base 210 of the fixing unit 200 along the inclined surface on the positioning seat 140 to the inner side of the base 210, locking the base 210 and the positioning seat 140, and fixing the measuring unit 100 and the fixing unit 200;

[0044] S4. Start the driving mechanism 110 to drive the driving plate 120 to move. The driving plate 120 drives the clamping plate 130 to move through the power transmission of the pressure sensor 160 and the displacement sensor 150, compressing the clamping spring 430. When the pressure sensor 160 has a reading, the displacement sensor 150 starts to record the displacement. The compression force is obtained through the pressure sensor 160, and the compression displacement is obtained through the displacement sensor 150. The stiffness of the clamping spring 430 is calculated based on the compression force data and the displacement data.

[0045] Example 2

[0046] The difference between this embodiment and the first embodiment is that the implementation method of the long-handled tool is further limited. Since the secondary neutron source assembly 400 of the present application is irradiated, the entire test process is carried out at a depth of six or seven meters underwater. Therefore, when the long-handled tool is rotating the cam mechanism 220, it is difficult for a conventional long-handled tool to be inserted into the hole of the ear bolt 223 on the one hand, and it is difficult to provide a large torque to rotate the cam mechanism 220 even if the long-handled tool is inserted. Therefore, in view of the above problems existing in the test process, this embodiment further limits the long-handled tool, specifically:

[0047] Among them, the cam mechanism 220 includes a camshaft 221 and a sleeve 225. The sleeve 225 is sleeved on the camshaft 221. The sleeve 225 can rotate around the camshaft 221, and the camshaft 221 can be fixedly installed on the stand 300 and remain stationary; the cam component 222 is fixed on the sleeve 225, and the cam component 222 can rotate around the camshaft 221 together with the sleeve 225. A first bevel gear 224 is arranged on the sleeve 225, and a lifting eye bolt 223 is arranged at the shaft end of the camshaft 221. A first magnetic component 226 is arranged on one side of the lifting eye bolt 223, and the first magnetic component 226 is arranged along the circumferential direction.

[0048] The stiffness measuring device of the compression spring 430 of the secondary neutron source assembly 400 further includes a rotating fixture 500, which includes an L-shaped rod 510, a guide sleeve 520 is provided on the short arm portion of the L-shaped rod 510, a second magnetic component 560 that can move along the guide sleeve 520 is sleeved on the guide sleeve 520, and a radially arranged accommodating cavity is further provided on the guide sleeve 520, and a limiting component 550 is provided in the accommodating cavity, and a ventilation channel 512 is provided in the middle of the L-shaped rod 510, one end of the ventilation channel 512 is connected to the accommodating cavity, and the other end of the ventilation channel 512 extends to the L-shaped rod 5 10, and a movable piston component 511 is provided at the end of the long arm portion, which can drive the limiting component 550 to move in the accommodating chamber when moving in the ventilation channel 512. The limiting component 550 extends out of the accommodating chamber, which can limit the L-shaped rod 510 from withdrawing from the ear bolt 223; the short arm portion of the L-shaped rod 510 is also sleeved with a second bevel gear 530, and the second bevel gear 530 can engage with the first bevel gear 224 when the short arm portion of the L-shaped rod is extended into the ear bolt 223, and a ratchet pawl assembly 540 is also provided between the second bevel gear 530 and the L-shaped rod 510.

[0049] When the cam mechanism 220 is rotated, it is only necessary to lower the entire L-shaped rod 510 into the water so that the short arm portion can be approximately close to the eye bolt 223, and then the first magnetic component 226 and the second magnetic component 560 can be connected by attracting each other. The first magnetic component 226 and the second magnetic component 560 both use a plurality of permanent magnets arranged in the circumferential direction of the axis of the eye bolt 223, so that after the two magnetic components attract each other, coaxial calibration is achieved, avoiding the problem that it is difficult to align the hole position when operating a long-handled tool underwater. Then, the L-shaped rod 510 is moved so that the short arm can be inserted into the ear bolt 223. In the subsequent rotation operation, in order to prevent the short arm from withdrawing from the ear bolt 223, the piston component 511 at the end of the long arm can be moved to allow the airflow in the ventilation channel 512 to flow and squeeze the limiting component 550 at the other end. The limiting component 550 can be made of conventional materials, such as rubber or plastic. After the limiting component 550 is extended, it can be limited to the other side of the ear bolt 223, thereby preventing the entire L-shaped rod 510 from withdrawing from the ear bolt 223. Of course, when it is necessary to withdraw, the piston component 511 can be moved in the opposite direction, which is convenient to operate. After the L-shaped rod 510 is positioned properly, the second bevel gear 530 meshes with the first bevel gear 224. At the same time, when the L-shaped rod 510 is rotated by the ratchet pawl assembly 540, the rotation here is a rotation around the short arm as the rotating axis, which drives the second bevel gear 530 to rotate. The ratchet pawl assembly 540 can be used to reciprocate at a certain angle to realize the entire circumferential rotation of the second bevel gear 530. After the second bevel gear 530 rotates, it can drive the first bevel gear 224 to rotate, and then it can drive the shaft sleeve 225 and the cam component 222 located on the shaft sleeve 225 to rotate. If disassembly is required, another rotating fixture 500 (not shown) can be replaced. The difference of this rotating assembly is that the rotation matching direction of the ratchet pawl assembly 540 can be set in the opposite direction to realize the reverse rotation of the second bevel gear 530.

[0050] A rubber pad is also provided between the positioning seat 140 and the base 210 , so that there is a certain amount of displacement during the pressing process of the positioning seat 140 and the base 210 , thereby ensuring that the cam mechanism 220 is pressed more compactly.

Claims

1. A secondary neutron source assembly compression spring stiffness measurement device, characterized in that: It includes a measuring unit and a fixing unit; The measuring unit comprises a driving mechanism, a driving plate, a clamping plate and a positioning seat, wherein the driving mechanism can drive the driving plate to move in a straight line direction, the clamping plate can be driven by the driving plate to compress the clamping spring, and a pressure sensor and a displacement sensor are also arranged between the driving plate and the clamping plate; the driving mechanism is arranged on the positioning seat; The fixing unit includes a base and a cam mechanism, the pressing spring is fixed in the base, the positioning seat of the measuring unit is arranged on the base, the positioning seat is provided with an inclined portion, and the cam mechanism is provided with a rotatable cam component, and the cam component can rotate from the low end to the high end of the inclined portion to press the positioning seat against the base.

2. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1, characterized in that: The secondary neutron source assembly includes a cylindrical part, a spring seat and a compression spring. The compression spring is sleeved on the cylindrical part. The bottom of the compression spring is fixed to the spring seat. The cylindrical part is also sleeved with an annular part. The bottom of the compression plate is fixed with a cylindrical part. The compression plate can squeeze the annular part sleeved on the cylindrical part through the cylindrical part, thereby squeezing the compression spring. The spring seat is positioned in the base by a positioning pin.

3. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1, characterized in that: The positioning seat adopts a square structure, the inclined portion is arranged on the upper edges of two opposite sides of the positioning seat, and the low end of the inclined portion is arranged at a position close to the end of the upper edge of the side, and the high end is arranged at a position close to the middle of the upper edge of the side, and has a distance of 3-5cm from the center position.

4. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1 or 3, characterized in that: The cam mechanism comprises a camshaft, an end of the camshaft is provided with a hanging bolt, the camshaft is mounted on a frame through a bearing, and the cam component is fixed on the camshaft.

5. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1 or 3, characterized in that: The cam mechanism comprises a camshaft and a sleeve, wherein the sleeve is sleeved on the camshaft, the cam component is fixed on the sleeve, a first bevel gear is arranged on the sleeve, a lug bolt is arranged at the shaft end of the camshaft, a first magnetic component is arranged on one side of the lug bolt, and the first magnetic component is arranged along the circumferential direction; The secondary neutron source assembly compression spring stiffness measuring device also includes a rotating fixture, which includes an L-shaped rod, a short arm portion of the L-shaped rod is provided with a guide sleeve, a second magnetic component that can move along the guide sleeve is sleeved on the guide sleeve, a radially arranged accommodating cavity is also provided on the guide sleeve, a limiting component is provided in the accommodating cavity, a ventilation channel is provided in the middle of the L-shaped rod, one end of the ventilation channel is connected to the accommodating cavity, and the other end of the ventilation channel extends to the end of the long arm portion of the L-shaped rod, and a movable piston component is provided at the end of the long arm portion, which can drive the limiting component to move in the accommodating cavity when moving in the ventilation channel, and the limiting component extends out of the accommodating cavity to limit the L-shaped rod from withdrawing from the ear bolt; the short arm portion of the L-shaped rod is also sleeved with a second bevel gear, and the second bevel gear can mesh with the first bevel gear when the short arm portion of the L-shaped rod extends into the ear bolt, and a ratchet pawl assembly is also provided between the second bevel gear and the L-shaped rod.

6. The secondary neutron source assembly compression spring stiffness measuring device according to claim 5, characterized in that: The first magnetic component and the second magnetic component both use a plurality of permanent magnets arranged along the circumferential direction of the axis of the eye bolt.

7. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1, characterized in that: A rubber pad is also arranged between the positioning seat and the base.

8. The secondary neutron source assembly compression spring stiffness measuring device according to claim 1, characterized in that: The driving mechanism includes a motor, a gear transmission assembly and a screw-nut assembly. The motor drives the screw of the screw-nut assembly to rotate through the gear transmission assembly. The nut of the screw-nut assembly is fixed to the driving plate to drive the driving plate to move.

9. The secondary neutron source assembly compression spring stiffness measuring device according to claim 8, characterized in that: The driving mechanism also includes a manual driving shaft, on which a manual gear is sleeved, and the manual gear is meshed with the screw nut assembly.

10. A method for measuring the stiffness of a secondary neutron source assembly compression spring based on the device for measuring the stiffness of a secondary neutron source assembly according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Install the secondary neutron source assembly in the base of the fixed unit; S2. Hoist the measuring unit onto the fixed unit, and use the long positioning pin of the positioning seat to position and install it on the base of the fixed unit; S3, rotating the cam components on both sides of the base of the fixing unit along the inclined surface on the positioning seat to the inner side of the base, locking the base and the positioning seat, and fixing the measuring unit and the fixing unit; S4. Start the driving mechanism to drive the driving plate to move. The driving plate drives the clamping plate to move through the power transmission of the pressure sensor and the displacement sensor to compress the clamping spring. When the pressure sensor has a reading, the displacement sensor starts to record the displacement. The compression force is obtained through the pressure sensor, and the compression displacement is obtained through the displacement sensor. The stiffness of the clamping spring is calculated based on the compression force data and the displacement data.

Images