Laser in-position signal device, spent fuel assembly transfer vehicle and transfer method thereof

Abstract

The invention discloses a laser in-position signal device, a spent fuel assembly transfer vehicle and a transfer method thereof, which can reduce the influence of a radioactive environment on the laser in-position signal device, reduce the attenuation of a laser signal, and reduce the heating of the laser in-position signal device. The laser in-position signal device comprises a laser generating and signal processing component (1), an optical fiber coupler (2) and an optical lens (4). The laser generating and signal processing component (1) is located outside a thermal chamber and is used to emit a first laser signal. The optical fiber coupler (2) is connected to the laser generating and signal processing component (1) via a first optical fiber, and the optical fiber coupler (2) is connected to the optical lens (4) via a second optical fiber; wherein the second optical fiber is a first quartz optical fiber. The laser generating and signal processing component (1) is also used to receive a second laser signal, and compare the phase difference between the first laser signal and the second laser signal to obtain position information of a measured object (6) and output a position signal.

Description

Technical Field

[0001] The invention belongs to the technical field of position detection, and in particular relates to a laser in-position signal device, a spent fuel assembly transfer vehicle and a transfer method thereof. Background Art

[0002] Commonly used arrival signal devices contain electrical components or enameled wires and cannot be used in strong radioactive environments. Therefore, laser ranging equipment is usually considered in strong radioactive environments.

[0003] Existing laser ranging equipment uses a laser generator, control and ranging module as an integrated structure. The non-metallic materials and ordinary optical fibers inside are prone to failure in a strong radioactive environment, causing equipment failure. Maintenance personnel cannot directly enter the radioactive site for maintenance and replacement.

[0004] If a general laser measuring device is directly disassembled and used, it will need to be connected after the optical fiber is disconnected. After the optical fiber is connected, the signal inside the optical fiber will be attenuated, resulting in the laser ranging equipment being unable to measure accurately. If the laser emission power is increased to ensure signal strength, the laser ranging equipment will heat up and cannot be used for a long time. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a laser in-position signal device, a spent fuel assembly transfer vehicle and a transfer method thereof in view of the above-mentioned deficiencies in the prior art, which can reduce the impact of the radioactive environment on the laser in-position signal device, reduce the attenuation of the laser signal, and reduce the heat generation of the laser in-position signal device.

[0006] In the first aspect, an embodiment of the present invention provides a laser in-position signal device, which includes a laser generating and signal processing component, a fiber coupler and an optical lens. The laser generating and signal processing component is located outside the hot chamber and is used to emit a first laser signal. The fiber coupler is arranged in the shielding wall of the hot chamber; the fiber coupler is connected to the laser generating and signal processing component through a first optical fiber, and the fiber coupler is connected to the optical lens through a second optical fiber; wherein the second optical fiber adopts a first quartz optical fiber. The optical lens is located in the hot chamber and is used to focus the first laser signal transmitted by the laser generating and signal processing component through the first optical fiber and the second optical fiber and then emit it to the object to be measured, and receive the second laser signal formed by the first laser signal irradiated on the object to be measured and reflected. The laser generating and signal processing component is also used to receive the second laser signal, and compare the phase difference between the first laser signal and the second laser signal to obtain the position information of the object to be measured and output the position signal.

[0007] In some embodiments, the optical fiber coupler includes a second quartz optical fiber and two quick connectors. The two quick connectors are coaxially packaged at two ends of the second quartz optical fiber, and the first optical fiber and the second optical fiber are respectively connected to the corresponding quick connectors.

[0008] In some embodiments, the laser generation and signal processing component includes a laser generator, a laser receiver, and a signal processor. The laser generator is connected to the first optical fiber and electrically connected to the signal processor, and is used to transmit a first laser signal with a first phase to the first optical fiber. The laser receiver is connected to the first optical fiber and electrically connected to the signal processor, and is used to receive a second laser signal returned by the first optical fiber, and convert the second laser signal into a detection signal and transmit it to the signal processor. The signal processor is used to control the phase of the first laser signal emitted by the laser generator, and obtain the second phase of the second laser signal after receiving the detection signal, and obtain the position information of the object to be measured after comparing the phase difference between the first phase and the second phase and output a position signal.

[0009] In some embodiments, the laser generator is a laser diode.

[0010] In some embodiments, the wavelength of the first laser signal is λ, 550nm≤λ≤700nm.

[0011] In some embodiments, the second optical fiber is coated with a radiation protection sleeve.

[0012] In some embodiments, the material of the radiation protection sleeve includes stainless steel.

[0013] In some embodiments, a collimator is disposed on the optical lens, and the collimator is located in a thermal chamber and disposed on an optical path of the optical lens, and is used to collimate the first laser signal.

[0014] Therefore, the laser in-position signal device in the embodiment of the present invention can avoid the influence of the radioactive environment in the hot room on the electronic devices in the laser generating and signal processing component by arranging the laser generating and signal processing component outside the hot room, so that the laser generating and signal processing component can work stably, reduce the influence of the radioactive environment on the laser in-position signal device, and facilitate the maintenance personnel to inspect and replace the laser generating and signal processing component outside the hot room. In addition, by arranging the optical fiber coupler, the sealing performance of the shielding wall can be guaranteed; the optical fiber coupler is connected to the laser generating and signal processing component through the first optical fiber, and is connected to the optical lens through the second optical fiber, so that the first optical fiber and the second optical fiber can be connected, so that the laser signal can be transmitted in the first optical fiber and the second optical fiber. Since the second optical fiber adopts the first quartz optical fiber, the advantages of the quartz optical fiber such as radiation resistance, long transmission distance, large transmission bandwidth, support for a higher frequency range, and low attenuation can be utilized to reduce the attenuation, dispersion and signal distortion of the laser signal when it is transmitted in the second optical fiber, which is conducive to ensuring the first laser signal intensity and the second laser signal intensity, so that the laser generating and signal processing component obtains the position information of the object to be measured according to the different phases of the first laser signal and the second laser signal, realizes the position detection function of the laser in-position signal device, and ensures the detection accuracy of the laser in-position signal device. Compared with the method of directly increasing the laser emission power to ensure signal strength in the prior art, the laser in-position signal device in this embodiment does not need to increase the laser emission power. Therefore, the heat generation of the laser in-position signal device can be reduced, so that the laser in-position signal device can be used for a long time.

[0015] In the second aspect, an embodiment of the present invention further provides a spent fuel assembly transfer trolley, which is located in a hot chamber. The spent fuel assembly transfer trolley includes a trolley body, a driving member, the laser in-position signal device in the first aspect, and a controller. The trolley body is provided with a transfer rail, and the spent fuel assembly arranged on the trolley body can move along the transfer rail. The driving member is arranged on the trolley body, and is used to push the spent fuel assembly to move along the transfer rail. The laser in-position signal device is arranged on the trolley body, and the first laser signal emitted by the optical lens of the laser in-position signal device irradiates the spent fuel assembly. The controller is electrically connected to the driving member and the laser generating and signal processing components of the laser in-position signal device, respectively, and is used to judge whether the spent fuel assembly has moved to the target position according to the position signal output by the laser generating and signal processing components, and to control whether the driving member stops pushing the spent fuel assembly to move according to the judgment result.

[0016] In a third aspect, an embodiment of the present invention further provides a spent fuel assembly transport method, which uses the spent fuel assembly transport trolley in the second aspect, and the spent fuel assembly transport method comprises: causing a driving member to push the spent fuel assembly to move along a transport guide rail; detecting position information of the spent fuel assembly through a laser position signal device and outputting a position signal; a controller determines whether the spent fuel assembly has moved to a target position based on the position signal; when the spent fuel assembly moves to the target position, the controller controls the driving member to stop pushing the spent fuel assembly to move.

[0017] The spent fuel assembly transfer vehicle and spent fuel assembly transfer method provided by the embodiments of the present invention have the same beneficial effects as the above-mentioned laser in-position signal device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A structural diagram of a laser in-position signal device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Embodiment 1:

[0021] like Figure 1 As shown, an embodiment of the present invention provides a laser position signal device, which is applied in a position measurement scenario to detect the position of an object.

[0022] like Figure 1 As shown, the laser in-position signal device includes a laser generating and signal processing component 1, a fiber optic coupler 2 and an optical lens 4.

[0023] The laser generating and signal processing component 1 is located outside the hot room and is used to emit a first laser signal. The optical fiber coupler 2 is installed in the shielding wall of the hot room. The optical fiber coupler 2 is connected to the laser generating and signal processing component 1 through a first optical fiber, and the optical fiber coupler 2 is connected to the optical lens 4 through a second optical fiber. Among them, the second optical fiber adopts a first quartz optical fiber. The optical lens 4 is located in the hot room and is used to focus the first laser signal transmitted by the laser generating and signal processing component 1 through the first optical fiber and the second optical fiber and then emit it to the object to be measured 6, and receive the second laser signal formed by the first laser signal irradiated on the object to be measured 6 and reflected. The laser generating and signal processing component 1 is also used to receive the second laser signal, and obtain the position information of the object to be measured 6 after comparing the phase difference between the first laser signal and the second laser signal and output the position signal.

[0024] It can be understood that the laser generation and signal processing component 1 includes electronic devices.

[0025] By arranging the laser generating and signal processing component 1 outside the hot room, the influence of the radioactive environment in the hot room on the electronic devices in the laser generating and signal processing component 1 can be avoided, so that the laser generating and signal processing component 1 can work stably and reduce the influence of the radioactive environment on the laser in-position signal device; and when the laser generating and signal processing component 1 fails and needs to be repaired or replaced, the maintenance personnel can directly carry out the repair or replacement outside the hot room, thereby avoiding the radiation hazard of the radioactive environment in the hot room to the maintenance personnel.

[0026] like Figure 1 As shown, the first optical fiber is also located outside the hot room and is hardly affected by the radioactive environment inside the hot room.

[0027] Exemplarily, the first optical fiber may be an ordinary plastic optical fiber, which has the advantages of high flexibility and low cost, and is conducive to improving the use flexibility of the laser in-position signal device and reducing the cost of the laser in-position signal device.

[0028] The optical fiber coupler 2 can ensure the sealing performance of the shielding wall, and connect the first optical fiber and the second optical fiber so that the laser signal can be transmitted in the first optical fiber and the second optical fiber. Quartz optical fiber has the advantages of radiation resistance, long transmission distance, large transmission bandwidth, support for a higher frequency range, and low attenuation. The second optical fiber adopts the first quartz optical fiber, which can reduce the attenuation, dispersion and signal distortion of the laser signal when it is transmitted in the second optical fiber, which is conducive to ensuring the laser signal strength, thereby ensuring the detection accuracy of the laser in-position signal device; at the same time, compared with the method of directly increasing the laser emission power to ensure the signal strength in the prior art, the laser in-position signal device in this embodiment does not need to increase the laser emission power, so the heat generation of the laser in-position signal device can be reduced, so that the laser in-position signal device can be used for a long time.

[0029] Exemplarily, the surface of the object 6 to be measured is a smooth surface, which can well reflect the laser signal.

[0030] For example, the material of the object 6 to be measured is stainless steel with a smooth surface.

[0031] Exemplarily, the distance between the measured object 6 and the optical lens 4 is in the range of 0.5 mm-50 mm, which can ensure that the second laser signal generated after being reflected has sufficient intensity.

[0032] like Figure 1 As shown, the first laser signal is emitted through the optical lens 4 and then emitted along the laser light path 5 toward the object to be measured 6, and generates a second laser signal after being reflected on the object to be measured 6. The second laser signal is also transmitted along the laser light path 5 to the optical lens 4 and then received, and continues to be emitted along the second optical fiber, the optical fiber coupler 2, and the first optical fiber toward the laser generation and signal processing component 1.

[0033] It can be understood that the phases of the first laser signal and the second laser signal are different. The laser generation and signal processing component 1 obtains the position information of the object 6 to be measured according to the different phases of the first laser signal and the second laser signal, and can output a position signal. The position signal can be applied to various control systems (such as limit sensors) that need to detect the position of the object 6 to be measured, and is used to identify whether the running stroke of the object 6 to be measured is in place.

[0034] Therefore, the laser in-position signal device in the embodiment of the present invention can avoid the influence of the radioactive environment in the hot room on the electronic devices in the laser generating and signal processing component 1 by setting the laser generating and signal processing component 1 outside the hot room, so that the laser generating and signal processing component 1 can work stably, reduce the influence of the radioactive environment on the laser in-position signal device, and facilitate maintenance personnel to inspect and replace the laser generating and signal processing component 1 outside the hot room. By setting the optical fiber coupler 2, the sealing performance of the shielding wall can be guaranteed; the optical fiber coupler 2 is connected to the laser generating and signal processing component 1 through the first optical fiber, and is connected to the optical lens 4 through the second optical fiber, so that the first optical fiber and the second optical fiber can be connected, so that the laser signal can be transmitted in the first optical fiber and the second optical fiber. Since the second optical fiber adopts the first quartz optical fiber, the advantages of quartz optical fiber such as radiation resistance, long transmission distance, large transmission bandwidth, support for higher frequency range and low attenuation can be utilized to reduce the attenuation, dispersion and signal distortion of the laser signal when it is transmitted in the second optical fiber, which is conducive to ensuring the intensity of the first laser signal and the second laser signal, so that the laser generation and signal processing component 1 obtains the position information of the object 6 to be measured according to the different phases of the first laser signal and the second laser signal, realizes the position detection function of the laser in-position signal device, and ensures the detection accuracy of the laser in-position signal device. Compared with the method of directly increasing the laser emission power to ensure the signal strength in the prior art, the laser in-position signal device in this embodiment does not need to increase the laser emission power, so the heat generation of the laser in-position signal device can be reduced, so that the laser in-position signal device can be used for a long time.

[0035] In some embodiments, Figure 1 As shown, the optical fiber coupler 2 includes a second quartz optical fiber and two quick connectors 3. The quick connectors 3 are coaxially packaged at both ends of the second quartz optical fiber, and the first optical fiber and the second optical fiber are connected to the corresponding quick connectors 3 respectively.

[0036] Exemplarily, the quick connector 3 may be a stainless steel quick connector, which can be radiation proof and have a longer service life.

[0037] Through the above arrangement, the attenuation of the laser signal during transmission in the optical fiber coupler 2 can be reduced, and the connection difficulty of the first optical fiber, the second optical fiber and the optical fiber coupler 2 can be reduced. When the second optical fiber in the hot chamber needs to be replaced, the second optical fiber can be replaced by remotely disassembling and assembling the quick connector 3 using a manipulator in the hot chamber, and the maintenance personnel do not need to enter the hot chamber, which reduces the difficulty of replacing the second optical fiber in the hot chamber and the radiation hazard of the maintenance personnel.

[0038] In some examples, such as Figure 1 As shown, the second quartz optical fiber and the two quick connectors 3 are arranged in pairs, and the optical fiber coupler 2 includes a plurality of second quartz optical fibers and two quick connectors 3 arranged in pairs.

[0039] Multiple quick connectors 3 in the hot chamber are connected to multiple optical lenses 4 through optical fiber couplers 2, and multiple quick connectors 3 outside the hot chamber are connected to multiple laser generating and signal processing components 1 through optical fiber couplers 2, thereby realizing simultaneous measurement of multiple signals of multiple measured objects 6. In this way, one of the laser in-position signal devices can be used as a backup, and even if one laser in-position signal device fails, the measurement of multiple signals of multiple measured objects 6 can still be realized.

[0040] In some embodiments, the laser generation and signal processing component 1 includes a laser generator, a laser receiver, and a signal processor. The laser generator is connected to the first optical fiber and electrically connected to the signal processor, and is used to transmit a first laser signal with a first phase to the first optical fiber under the control of the signal processor. The laser receiver is connected to the first optical fiber and electrically connected to the signal processor, and is used to receive the second laser signal returned by the first optical fiber, and convert the second laser signal into a detection signal and transmit it to the signal processor. The signal processor is used to control the phase of the first laser signal emitted by the laser generator, and obtain the second phase of the second laser signal after receiving the detection signal, and obtain the position information of the object 6 to be measured after comparing the phase difference between the first phase and the second phase and output the position signal.

[0041] Exemplarily, the laser generator may be a solid laser, a gas laser, a semiconductor laser, or the like.

[0042] Exemplarily, the signal processor may control the intensity of the first laser signal emitted by the laser generator, and make the phase of the first laser signal emitted by the laser generator be the first phase.

[0043] Exemplarily, the first phase is an arbitrary phase.

[0044] The first laser signal emitted by the laser generator is transmitted to the optical lens 4 through the first optical fiber, the optical fiber coupler 2 and the second optical fiber and emitted to the object to be measured 6 .

[0045] Exemplarily, the laser receiver has a photoelectric conversion function, which is used to convert the received second laser signal into an electrical signal. The above detection signal is an electrical signal, and the detection signal contains phase information in the second laser signal.

[0046] Exemplarily, the signal processor may be a general-purpose microprocessor.

[0047] Through the above arrangement, the position information of the object 6 to be detected can be detected.

[0048] In some embodiments, the laser generator is a laser diode.

[0049] The laser diode has the characteristics of good linearity, small divergence angle, concentrated energy, and stable trigger current, which is beneficial to improving the signal strength and transmission performance of the first laser signal emitted by the laser generator.

[0050] In some embodiments, the wavelength of the first laser signal is λ, 550nm≤λ≤700nm.

[0051] Exemplarily, the wavelength λ of the first laser signal may be 550 nm, 600 nm, or 700 nm.

[0052] The laser signal of the above wavelength has the advantages of high penetration and low transmission loss, which is beneficial to reduce the attenuation of the laser signal when it is transmitted in the first optical fiber and the second optical fiber, ensuring the intensity of the second laser signal received by the laser receiver, thereby ensuring the normal operation of the laser arrival signal device.

[0053] In some embodiments, the second optical fiber is coated with a radiation protection sleeve.

[0054] Exemplarily, the material of the radiation shielding sleeve includes stainless steel.

[0055] The radiation-proof sleeve can form an armor layer outside the second optical fiber, which can not only physically protect the second optical fiber, but also prevent the influence of the radioactive environment on the laser signal in the second optical fiber, thereby ensuring the normal transmission of the laser signal in the second optical fiber.

[0056] In some embodiments, a collimator is disposed on the optical lens 4. The collimator is located in the thermal chamber and is disposed on the optical path of the optical lens 4 for collimating the first laser signal.

[0057] Exemplarily, the collimator is arranged on the light exiting side of the optical lens 4 .

[0058] Exemplarily, the optical lens 4 is fixed on a mounting seat to keep the position of the optical lens 4 stable so that the direction of the first laser signal emitted by the optical lens 4 remains unchanged.

[0059] Through the above arrangement, the directivity of the first laser signal can be improved, so that the optical lens 4 can be quickly adjusted to allow the first laser signal to be emitted toward the object 6 to be measured.

[0060] Embodiment 2:

[0061] The embodiment of the present invention also provides a spent fuel assembly transfer trolley, which is located in a hot chamber. The spent fuel assembly transfer trolley includes a trolley body, a driving member, the laser in-position signal device in Example 1, and a controller. A transfer rail is provided on the trolley body, and the spent fuel assembly arranged on the trolley body can move along the transfer rail. The driving member is provided on the trolley body, and is used to push the spent fuel assembly to move along the transfer rail. The laser in-position signal device is provided on the trolley body, and the first laser signal emitted by the optical lens 4 of the laser in-position signal device irradiates the spent fuel assembly. The controller is electrically connected to the driving member and the laser generating and signal processing component 1 of the laser in-position signal device, respectively, and is used to judge whether the spent fuel assembly has moved to the target position according to the position signal output by the laser generating and signal processing component 1, and to control whether the driving member stops pushing the spent fuel assembly to move according to the judgment result.

[0062] Exemplarily, the driving member may be an electric pusher head or a pneumatic pusher head, etc.

[0063] The spent fuel assembly can be lifted by a crane to the initial position on the transfer rail. At this time, the drive component is started to push the spent fuel assembly to move along the transfer rail. At the same time, the laser in-position signal device detects the position of the spent fuel assembly and outputs a position signal.

[0064] When the controller determines that the spent fuel assembly has moved to the target position according to the position signal output by the laser in-position signal device, the controller controls the driving member to stop, and the spent fuel assembly no longer moves, thereby realizing the transfer of the spent fuel assembly from the initial position to the target position.

[0065] Through the above arrangement, the position of the spent fuel assembly can be detected by the laser position signal device to accurately control the movement of the spent fuel assembly on the moving vehicle, thereby accurately moving the spent fuel assembly to the target position.

[0066] Embodiment 3:

[0067] The embodiment of the present invention further provides a spent fuel assembly transfer method. The spent fuel assembly transfer method uses the spent fuel assembly transfer vehicle in Embodiment 2. The spent fuel assembly transfer method includes: S100-S300.

[0068] S100, causing the driving member to push the spent fuel assembly to move along the transfer guide rail.

[0069] S200, detecting the position information of the spent fuel assembly through a laser position signal device and outputting a position signal.

[0070] S300, the controller determines whether the spent fuel assembly has moved to the target position according to the position signal; when the spent fuel assembly moves to the target position, the controller controls the driving member to stop pushing the spent fuel assembly to move.

[0071] Exemplarily, the driving member is an electric pusher, and the controller stops the driving member from pushing the spent fuel assembly to move by disconnecting the power supply of the driving member.

[0072] Therefore, the driving member can be controlled by the controller according to the detection of the position information of the spent fuel assembly by the laser position signal device, so that the driving member can accurately move the spent fuel assembly to the target position.

[0073] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A laser in-position signal device, characterized in that: include: A laser generating and signal processing component (1), located outside the thermal chamber, is used to emit a first laser signal; An optical fiber coupler (2) is arranged in the shielding wall of the heat chamber; the optical fiber coupler (2) is connected to the laser generating and signal processing component (1) via a first optical fiber, and the optical fiber coupler (2) is connected to the optical lens (4) via a second optical fiber; wherein the second optical fiber is a first quartz optical fiber; and, an optical lens (4) located in the thermal chamber, for focusing the first laser signal transmitted by the laser generating and signal processing component (1) through the first optical fiber and the second optical fiber and emitting the focused laser signal toward the object to be measured (6), and for receiving a second laser signal formed by the first laser signal being irradiated on the object to be measured (6) and reflected; The laser generating and signal processing component (1) is also used to receive the second laser signal, compare the phase difference between the first laser signal and the second laser signal, obtain the position information of the measured object (6), and output a position signal.

2. The laser in-position signal device according to claim 1, characterized in that: The optical fiber coupler (2) comprises: a second silica optical fiber; and, Two quick connectors (3) are coaxially packaged at two ends of the second quartz optical fiber, and the first optical fiber and the second optical fiber are respectively connected to the corresponding quick connectors (3).

3. The laser arrival signal device according to claim 1, characterized in that: The laser generating and signal processing component (1) comprises: a laser generator connected to the first optical fiber and electrically connected to the signal processor, and configured to emit a first laser signal having a first phase to the first optical fiber; a laser receiver connected to the first optical fiber and electrically connected to the signal processor, configured to receive a second laser signal returned by the first optical fiber, convert the second laser signal into a detection signal, and transmit the converted signal to the signal processor; and, A signal processor is used to control the phase of the first laser signal emitted by the laser generator, and to obtain the second phase of the second laser signal after receiving the detection signal, and to obtain the position information of the object (6) to be measured after comparing the phase difference between the first phase and the second phase, and to output a position signal.

4. The laser arrival signal device according to claim 3, characterized in that: The laser generator adopts a laser diode.

5. The laser arrival signal device according to claim 4, characterized in that: The wavelength of the first laser signal is λ, 550nm≤λ≤700nm.

6. The laser arrival signal device according to claim 1, characterized in that: The second optical fiber is coated with a radiation-proof sleeve.

7. The laser arrival signal device according to claim 6, characterized in that: The material of the radiation protection sleeve includes stainless steel.

8. The laser arrival signal device according to claim 1, characterized in that: The optical lens (4) is provided with a collimator; The collimator is located in the thermal chamber and is arranged on the optical path of the optical lens (4) for collimating the first laser signal.

9. A spent fuel assembly transfer vehicle, located in a hot chamber, characterized in that: include: A trolley body, wherein the trolley body is provided with a transfer rail, and the spent fuel assembly arranged on the trolley body can move along the transfer rail; A driving member, disposed on the trolley body, for driving the spent fuel assembly to move along the transfer rail; The laser in-position signal device according to any one of claims 1 to 8 is arranged on the trolley body, and the first laser signal emitted by the optical lens (4) of the laser in-position signal device irradiates the spent fuel assembly; and, A controller is electrically connected to the driving member and the laser generating and signal processing component (1) of the laser in-position signal device, and is used to judge whether the spent fuel assembly has moved to the target position according to the position signal output by the laser generating and signal processing component (1), and to control whether the driving member stops pushing the spent fuel assembly to move according to the judgment result.

10. A method for transporting a spent fuel assembly, characterized in that: Using the spent fuel assembly transfer vehicle according to claim 9, the spent fuel assembly transfer method comprises: The driving member drives the spent fuel assembly to move along the transfer guide rail; Detecting the position information of the spent fuel assembly through a laser position signal device and outputting a position signal; The controller determines whether the spent fuel assembly has moved to the target position according to the position signal; when the spent fuel assembly has moved to the target position, the controller controls the driving member to stop pushing the spent fuel assembly to move.

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