阅读说明：本技术 重水堆核电站装卸料机远程应急操作工具及操作方法 (Remote emergency operation tool and operation method for heavy water reactor nuclear power station material loading and unloading machine ) 是由 张连生 王强伟 高照 曹烽华 施维真 张利东 蒋军建 于 2019-11-14 设计创作，主要内容包括：本发明涉及重水堆核燃料装卸技术领域，具体公开了一种重水堆核电站装卸料机远程应急操作工具及操作方法。该工具包括驱动机构、驱动长杆、中间导向支架以及驱动头组件，其中，中间导向支架安装在重水堆核电站装卸料机下部对应位置的底板贯穿孔中，所述的中间导向支架可对驱动长杆进行导向支撑；所述驱动长杆由若干节中间连接管连接形成任意长度的刚性长杆；驱动长杆下端与安装在地面上的驱动机构相连接，利用驱动机构可驱动长杆上部安装的驱动头组件在一定范围内升降及旋转。本发明所述的一种重水堆核电站装卸料机远程应急操作工具，易于安装，操作便捷，使用较为安全可靠。(The invention relates to the technical field of heavy water reactor nuclear fuel loading and unloading, and particularly discloses a remote emergency operation tool and an operation method for a loading and unloading machine of a heavy water reactor nuclear power station. The tool comprises a driving mechanism, a long driving rod, a middle guide bracket and a driving head assembly, wherein the middle guide bracket is arranged in a through hole of a bottom plate at a corresponding position at the lower part of a loading and unloading machine of the heavy water reactor nuclear power station, and the middle guide bracket can guide and support the long driving rod; the driving long rod is formed by connecting a plurality of sections of middle connecting pipes to form a rigid long rod with any length; the lower end of the long driving rod is connected with a driving mechanism arranged on the ground, and the driving mechanism can drive a driving head assembly arranged on the upper part of the long driving rod to lift and rotate within a certain range. The remote emergency operation tool for the heavy water reactor nuclear power station material loading and unloading machine is easy to install, convenient and fast to operate, and safe and reliable to use.)

1. The utility model provides a long-range emergency operation instrument of heavy water reactor nuclear power station loading and unloading machine which characterized in that: the tool comprises a driving mechanism (1), a long driving rod (2), a middle guide support (3) and a driving head assembly (4), wherein the middle guide support (3) is arranged in a bottom plate through hole at a corresponding position at the lower part of a loading and unloading machine of the heavy water reactor nuclear power station, and the middle guide support (3) can guide and support the long driving rod (2); the long driving rod (2) is formed into a rigid long rod with any length by connecting a plurality of sections of middle connecting pipes (13); the lower end of the long driving rod (2) is connected with a driving mechanism (1) arranged on the ground, and the driving mechanism (1) can drive a driving head assembly (4) arranged on the upper part of the long driving rod (2) to lift and rotate within a certain range.

2. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 1, wherein: actuating mechanism (1) including connector (5), drive gear box (6), adjusting nut (7), supporting disk (8) and driving screw (10), supporting disk (8) support fixedly through bracing piece (11), driving screw (10) pass supporting disk (8) centre bore to be equipped with locking device (10) in the lower extreme, driving screw (10) pot head have adjusting nut (7) to be equipped with drive gear box (6) in driving screw (10) upper end, drive gear box (6) upper portion output shaft be connected with drive stock (2) through connector (5).

3. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 1, wherein: the long driving rod (2) comprises a plurality of sections of middle connecting pipes (13) and joints (14) with different lengths, wherein the middle connecting pipes (13) are connected and fixed by adopting threads and tongue-and-groove joints (14) to form rigid long rods with different lengths.

4. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 1, wherein: middle guide bracket (3) include uide bushing (15), universal seat (20) and fixing base (21), wherein, universal seat (20) install in the bottom plate through hole through fixing base (21), uide bushing (15) be split type structure, it is installed on universal seat (20), can adapt to the drive head of different specifications and pass through to its direction supporting role.

5. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 1, wherein: the driving head assembly (4) comprises a multifunctional driving head, a standby driving head of a B-rod and L-rod manual automatic switching device, and a B-rod and L-rod emergency driving joint, and the multifunctional driving head can realize the unlocking function of the B-rod and L-rod emergency driving device; the spare driving head of the B-rod and L-rod manual automatic switching device can be matched with the B-rod and L-rod manual automatic switching device and is used as a substitute for the function of the multifunctional driving head part; the B rod and the L rod emergency driving joint are matched with the B rod, the L rod and the bin emergency driving screw rod.

6. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 4, wherein: the guide sleeve (15) is spliced by a plurality of arc-shaped sections distributed in the circumferential direction to form a cylindrical structure, each arc-shaped section is fixedly connected with the universal seat (20) through the connecting rod (17), the pin shaft (19) is inserted into the connecting end, a spring A (18) is further arranged between each arc-shaped section and the corresponding universal seat (20), and the guide sleeve (15) can support the driving long rod in a guiding mode by the aid of the spring A (18).

7. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 5, wherein: the multifunctional driving head comprises a turnover sleeve (22), a positioning sleeve (23), a spring B (24) and a lower positioning sleeve (25), wherein the positioning sleeve (23) is arranged in the turnover sleeve (22), and the lower end of the positioning sleeve (23) is arranged on the lower positioning sleeve (25) through the spring B (24); the positioning sleeve (23) compresses the spring B (24), and a center rod at the lower end of the positioning sleeve (23) is fixed with the lower positioning sleeve (25) by using a fixing pin A (26).

8. The heavy water reactor nuclear power plant handler remote emergency operation tool of claim 5, wherein: the standby driving head of the B-rod and L-rod manual automatic switching device comprises a bell mouth (27), a positioning rod (29) and a fixing pin B (30), wherein the positioning rod (29) is arranged in a through hole in the center of the bottom end of the bell mouth (27), and the fixing pin B (30) penetrates through the side wall of the bottom end of the bell mouth (27) and the central shaft of the positioning rod to fix the positioning rod (29) and the bell mouth (27); through holes are formed in the side wall of the bell mouth (27) and the side wall of the positioning rod (29), a pin (28) is arranged in the through holes, and the B rod and the L rod are manually and automatically switched by the pin (28).

9. A remote emergency operation method for a heavy water reactor nuclear power station material loading and unloading machine is characterized by comprising the following steps: the method specifically comprises the following steps:

step 1, installing a remote emergency operation device of a heavy water reactor nuclear power station material loading and unloading machine;

step 1.1, removing a shielding plug on a bottom plate at a corresponding position on the lower part of the loading and unloading machine, and exposing a through hole of the bottom plate;

step 1.2, installing a middle guide bracket on a through hole of a bottom plate;

step 1.3, separating a guide sleeve in the middle guide bracket;

step 1.4, installing a driving mechanism on the ground;

step 2, completing manual automatic switching operation by using an operating device;

step 2.1, closing the guide sleeve to guide the long driving rod;

2.2, adding a single-section middle connecting rod until the target height is reached;

2.3, enabling the driving head to enter the manual-automatic switching mechanism and be connected by utilizing an adjusting nut on the supporting plate, and locking an adjusting screw rod through a locking mechanism;

step 2.4, the driving handle is utilized to drive the gear box to rotate to drive the long rod to complete manual and automatic switching operation;

step 3, completing the unlocking operation of the emergency mechanism;

3.1, separating the driving head from the manual-automatic switching mechanism by using an adjusting nut, and locking an adjusting screw;

3.2, gradually reducing the single-section middle connecting rod, reducing the overall height of the long driving rod, detaching the manual-automatic switching driving head, and installing an unlocking driving head;

3.3, increasing a single-section middle connecting rod, and raising the overall height of the long driving rod until the long driving rod reaches the target height to complete the unlocking operation of the emergency mechanism;

step 4, completing the driving operation of the B rod and the L rod;

step 4.1, gradually reducing the single-section middle connecting rod, detaching the unlocking driving head, and installing a B rod driving head and an L rod driving head;

4.2, adding a single-section middle connecting rod until the target height is reached;

4.3, connecting the driving head with the emergency driving screw rod through the adjusting nut, and locking the adjusting screw rod through the locking mechanism;

4.4, rotating the long driving rod through the driving gear box to complete the driving operation of the B rod and the L rod;

and 5, finishing the operation and dismantling the tool.

10. The heavy water reactor nuclear power plant handler remote emergency operation method according to claim 9, characterized in that: the specific steps of installing the driving mechanism on the ground in the step 1.4 comprise;

and installing a lower support of the tool on the ground, assembling the driving rod and the manual-automatic switching driving head, penetrating through a guide sleeve of the guide support to extend upwards, and connecting the lower part of the guide sleeve with an upper joint of the driving gear box.

Technical Field

The invention belongs to the technical field of heavy water reactor nuclear fuel loading and unloading, and particularly relates to a remote emergency operation tool and an operation method for a loading and unloading machine of a heavy water reactor nuclear power station.

Background

The heavy water reactor nuclear power plant material loading and unloading machine is an important device for replacing heavy water reactor nuclear fuel. The storage bin is a device for storing fuel rod bundles on the loading and unloading machine and is driven by a hydraulic motor during normal operation. The B-rod and the L-rod are devices for replacing fuel rod bundles on the loading and unloading machine and are normally controlled by hydraulic motors respectively. The stock bin, the B rod and the L rod are key equipment for ensuring normal reloading.

In order to ensure the safety of the loading and unloading machine, the material changing operation can be still completed, the fuel channel is closed, and spent fuel can be unloaded under the fault working condition, and the emergency driving mechanism is independently arranged on the storage bin, the B rod and the L rod of the loading and unloading machine and is used for fault emergency driving of the loading and unloading machine. However, the handler is located in the fuel passage end room during refueling and spent fuel may be carried in the handler, so the peripheral radiation dose is extremely high and cannot be accessed by personnel. Therefore, the remote emergency operation tool needs to be designed, so that when personnel cannot get close to the remote emergency operation tool, the remote emergency operation tool drives the bin, the B rod and the L rod to act.

The B rod, the L rod and the stock bin of the loading and unloading machine of the three-factory (heavy water reactor) with middle nuclear operation are automatically driven by a hydraulic motor during normal operation. When the hydraulic control system fails and other problems occur, the emergency driving mechanism can be used for manual operation. When personnel can access the material handling machine, special tools can be used for close-range operation. However, when spent fuel is brought into a loading and unloading machine bin or when the loading and unloading machine replaces fuel on a reactor, personnel cannot get close to the loading and unloading machine and need to carry out remote manual operation through a long-rod tool.

The manual driving mechanism of the storage bin mainly comprises a gear box and a driving screw rod, a driving rod is jacked up for a certain distance during manual operation and then rotates to be meshed with the driving rod of the gear box, and then the driving rod is kept in a jacked state and simultaneously rotates to drive the storage bin to rotate.

The emergency driving mechanism and the manual-automatic switching mechanism of the B rod and the L rod have the same structure, but are independent. Before the B rod or the L rod is driven manually, the manual-automatic switching structure is pulled down and rotated to be placed in an automatic position, and the connection between the hydraulic motor and the equipment is disconnected. Then the locking nut of the emergency driving mechanism is unscrewed, so that the manual driving shaft is connected with the equipment, and then the driving screw rod is rotated to move the rod B and the rod L.

Before the tool is manufactured, the method of field emergency operation is that a long rod is matched with a spanner to drive the stock bin, and the stock bin is lifted by hands to drive the stock bin. The operation is inconvenient, and the simple tool cannot realize the manual driving of the B rod and the L rod. The main deficiency of the existing device is: (1) the operation is inconvenient, no support and guide are provided, and the emergency driving mechanism of the storage bin cannot be aligned smoothly; (2) manpower is required for lifting, and unsafe factors exist; (3) the failure processing efficiency is low, and the operation is not suitable for a long time; (4) the manual automatic switching of the B rod and the L rod cannot be completed; (5) the emergency driving operation of the B rod and the L rod cannot be finished; (6) when B pole, L pole or feed bin of handling material machine broke down on the reactor fuel passageway, because the stock length overlength that needs, weight is too big, former simple and easy instrument can't use completely.

Disclosure of Invention

The invention aims to provide a remote emergency operation tool and an operation method for a heavy water reactor nuclear power station material loading and unloading machine, which can reduce the influence of possible high-dose irradiation on personnel, can remotely operate a stock bin, a B rod and an L rod, can complete complex operations such as manual and automatic switching and the like, and can restore the material loading and unloading machine to a safe state.

The technical scheme of the invention is as follows: a remote emergency operation tool for a heavy water reactor nuclear power station material loading and unloading machine comprises a driving mechanism, a long driving rod, a middle guide support and a driving head assembly, wherein the middle guide support is arranged in a bottom plate through hole in a corresponding position at the lower part of the heavy water reactor nuclear power station material loading and unloading machine, and can guide and support the long driving rod; the driving long rod is formed by connecting a plurality of sections of middle connecting pipes to form a rigid long rod with any length; the lower end of the long driving rod is connected with a driving mechanism arranged on the ground, and the driving mechanism can drive a driving head assembly arranged on the upper part of the long driving rod to lift and rotate within a certain range.

The driving mechanism comprises a connector, a driving gear box, an adjusting nut, a supporting plate and a transmission screw rod, the supporting plate is supported and fixed through a supporting rod, the transmission screw rod penetrates through a central hole of the supporting plate, a locking device is arranged at the lower end of the transmission screw rod, the adjusting nut is sleeved at the upper end of the transmission screw rod, the driving gear box is arranged at the upper end of the transmission screw rod, and an output shaft at the upper part of the driving gear box is connected with the long driving rod through the connector;

the driving long rod comprises a plurality of sections of middle connecting pipes and joints with different lengths, and the middle connecting pipes are connected and fixed by adopting threads and tongue-and-groove joints to form rigid long rods with different lengths.

The middle guide support comprises a guide sleeve, a universal seat and a fixed seat, wherein the universal seat is installed in a through hole of the bottom plate through the fixed seat, the guide sleeve is of a split structure and is installed on the universal seat, and the guide sleeve can be suitable for driving heads of different specifications to pass through and has a guide supporting effect.

The driving head assembly comprises a multifunctional driving head, a standby driving head of a B-rod and L-rod manual automatic switching device, and a B-rod and L-rod emergency driving joint, and the multifunctional driving head can realize the unlocking function of the B-rod and L-rod emergency driving device; the spare driving head of the B-rod and L-rod manual automatic switching device can be matched with the B-rod and L-rod manual automatic switching device and is used as a substitute for the function of the multifunctional driving head part; the B rod and the L rod emergency driving joint are matched with the B rod, the L rod and the bin emergency driving screw rod.

The guide sleeve is formed by splicing a plurality of arc sections distributed in the circumferential direction to form a cylindrical structure, each arc section is fixedly connected with the universal seat through a connecting rod, a pin shaft is inserted into the connecting end, a spring A is further arranged between each arc section and the universal seat, and the guide sleeve can support the driving long rod in a guiding mode through the spring A.

The multifunctional driving head comprises a turnover sleeve, a positioning sleeve, a spring B and a lower positioning sleeve, wherein the positioning sleeve is arranged in the turnover sleeve, and the lower end of the positioning sleeve is arranged on the lower positioning sleeve through the spring B; the positioning sleeve compresses the spring B, and the center rod at the lower end of the positioning sleeve is fixed with the lower positioning sleeve by the fixing pin A.

The spare driving head of the B-rod and L-rod manual automatic switching device comprises a bell mouth, a positioning rod and a fixing pin B, wherein the positioning rod is arranged in a central through hole at the bottom end of the bell mouth, and the fixing pin B penetrates through the side wall at the bottom end of the bell mouth and a central shaft of the positioning rod to fix the positioning rod and the bell mouth; through holes are formed in the side wall of the bell mouth and the side wall of the positioning rod, pins are arranged in the through holes, and the B rod and the L rod are automatically switched by using a pin handle.

A remote emergency operation method for a heavy water reactor nuclear power station material loading and unloading machine comprises the following steps:

step 1, installing a remote emergency operation device of a heavy water reactor nuclear power station material loading and unloading machine;

step 1.1, removing a shielding plug on a bottom plate at a corresponding position on the lower part of the loading and unloading machine, and exposing a through hole of the bottom plate;

step 1.2, installing a middle guide bracket on a through hole of a bottom plate;

step 1.3, separating a guide sleeve in the middle guide bracket;

step 1.4, installing a driving mechanism on the ground;

step 2, completing manual automatic switching operation by using an operating device;

step 2.1, closing the guide sleeve to guide the long driving rod;

2.2, adding a single-section middle connecting rod until the target height is reached;

2.3, enabling the driving head to enter the manual-automatic switching mechanism and be connected by utilizing an adjusting nut on the supporting plate, and locking an adjusting screw rod through a locking mechanism;

step 2.4, the driving handle is utilized to drive the gear box to rotate to drive the long rod to complete manual and automatic switching operation;

step 3, completing the unlocking operation of the emergency mechanism;

3.1, separating the driving head from the manual-automatic switching mechanism by using an adjusting nut, and locking an adjusting screw;

3.2, gradually reducing the single-section middle connecting rod, reducing the overall height of the long driving rod, detaching the manual-automatic switching driving head, and installing an unlocking driving head;

3.3, increasing a single-section middle connecting rod, and raising the overall height of the long driving rod until the long driving rod reaches the target height to complete the unlocking operation of the emergency mechanism;

step 4, completing the driving operation of the B rod and the L rod;

step 4.1, gradually reducing the single-section middle connecting rod, detaching the unlocking driving head, and installing a B rod driving head and an L rod driving head;

4.2, adding a single-section middle connecting rod until the target height is reached;

4.3, connecting the driving head with the emergency driving screw rod through the adjusting nut, and locking the adjusting screw rod through the locking mechanism;

4.4, rotating the long driving rod through the driving gear box to complete the driving operation of the B rod and the L rod;

and 5, finishing the operation and dismantling the tool.

The specific steps of installing the driving mechanism on the ground in the step 1.4 comprise;

and installing a lower support of the tool on the ground, assembling the driving rod and the manual-automatic switching driving head, penetrating through a guide sleeve of the guide support to extend upwards, and connecting the lower part of the guide sleeve with an upper joint of the driving gear box.

The invention has the following remarkable effects: the remote emergency operation tool for the heavy water reactor nuclear power station material loading and unloading machine is easy to install, convenient and fast to operate and safe and reliable to use; the device comprises a plurality of driving heads which can be respectively matched with an emergency driving device of a loading and unloading machine bin, a push rod manual driving mechanism and a push rod manual-automatic switching mechanism; the long driving rods are connected in a segmented mode, the length can be changed from 3 meters to 16 meters, and the requirement of remote operation is met; the total weight of the long driving rod is light, the long driving rod can be operated by a single person after being completely connected, and the driving mechanism has a simple structure and is easy to install on site.

Drawings

FIG. 1 is a schematic structural view of a remote emergency operation tool for a heavy water reactor nuclear power plant material handling machine according to the present invention;

FIG. 2 is a schematic view of the drive mechanism of FIG. 1;

FIG. 3 is a schematic view of the construction of the intermediate support and guide bracket of FIG. 1;

FIG. 4 is a schematic view of the multi-functional driving head shown in FIG. 1;

FIG. 5 is a schematic view of a structure of an operating rod sleeve head in a remote emergency operation tool for a heavy water reactor nuclear power plant material handling machine according to the present invention;

FIG. 6 is a schematic diagram of a driving head structure of a B rod and an L rod in a remote emergency operation tool of a heavy water reactor nuclear power plant material handling machine according to the present invention;

FIG. 7 is a side view of the driving heads of the B rod and the L rod in the remote emergency operation tool for the material handling machine of the heavy water reactor nuclear power plant;

in the figure: 1. a drive mechanism; 2. driving the long rod; 3. a middle guide bracket; 4. a drive head assembly; 5. a connector; 6. a drive gear box; 7. adjusting the nut; 8. a support disc; 9. a locking device; 10. a screw; 11. a support bar; 12. a drive handle; 13. a middle connecting rod; 14. a joint; 15. a guide sleeve; 16. an operating handle; 17. a connecting rod; 18. a spring A; 19. a pin shaft; 20. a universal base; 21. a fixed seat; 22. turning over the sleeve; 23. a positioning sleeve; 24. a spring B; 25. a lower positioning sleeve; 26. a fixing pin A; 27. a bell mouth; 28. A pin; 29. positioning a rod; 30. and fixing the pin B.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

As shown in fig. 1 and 2, a heavy water reactor nuclear power station material handling machine remote emergency operation tool comprises a driving mechanism 1, a long driving rod 2, a middle guide support 3 and a driving head assembly 4, wherein the driving mechanism 1 comprises a connector 5, a driving gear box 6, an adjusting nut 7, a supporting plate 8 and a transmission screw rod 10, the lower end of the supporting plate 8 is supported and fixed through three supporting rods 11, the transmission screw rod 10 penetrates through a hole in the center of the supporting plate 8, and a locking device 10 is installed on the transmission screw rod 10 at the lower end of the supporting plate 8; the adjusting nut 7 is sleeved on the transmission screw rod 10 and is arranged on the upper end face of the supporting plate, the tool can be driven to integrally ascend and descend by rotating the adjusting nut 7, and the tool can be locked by the locking device 9; a driving gear box 6 is arranged at the upper end of the transmission screw rod 10, an output shaft at the upper part of the driving gear box 6 is connected with the long driving rod 2 through a connector 5, a driving handle 12 is arranged on the driving gear box 6, and the whole tool is rotated through manual operation of the driving handle 12;

the long driving rod 2 comprises a plurality of sections of middle connecting pipes 13 and joints 14 with different lengths, each middle connecting pipe 13 is connected through the joint 14 to form the long driving rod 2 which can adapt to different height operation requirements, wherein each middle connecting pipe 13 is connected and fixed by adopting a thread and a tongue-and-groove joint; the whole length of the long driving rod 2 can be adjusted, and the whole length of the long driving rod can be adjusted by increasing the number of the middle connecting pipes 13 of each section;

as shown in fig. 3, the middle guide bracket 3 includes a guide sleeve 15, an operating handle 16, a universal seat 20 and a fixed seat 21, wherein the guide sleeve 15 is of a detachable structure, and several arc-shaped sections distributed circumferentially are spliced to form a cylindrical structure and play a role in guiding and supporting, each arc-shaped section is fixed on the universal seat 20 through a connecting rod pin 19, wherein each arc-shaped section is connected with the universal seat 20 through a connecting rod 17, the pin 19 is inserted into the connecting end, and a spring a18 is further installed between the arc-shaped section and the universal seat 20, so that the guide sleeve 15 can be adapted to pass through driving heads of various specifications and play a role in guiding and supporting; the universal base 20 can rotate at a certain angle integrally, so that the tool and the driven equipment can be accurately positioned; the universal seat 20 is fixedly arranged on the ceiling wall through a fixed seat 21; an operating handle 16 is also arranged at the lower end of the center of the universal seat 20, and the long driving rod 2 passes through the operating handle 16 and is supported and guided by a guide sleeve 15; the middle guide bracket 3 can guide the long driving rod 2 and can finely adjust the deflection angle of the long driving rod 2 after the long driving rod extends upwards;

the driving head assembly 4 comprises a multifunctional driving head, a B rod, a spare driving head of an L rod manual automatic switching device, a B rod emergency driving joint and an L rod emergency driving joint, wherein as shown in fig. 4, the multifunctional driving head comprises a turnover sleeve 22, a positioning sleeve 23, a spring B24 and a lower positioning sleeve 25, wherein the positioning sleeve 23 used for unlocking a nut is installed in the turnover sleeve 22, the lower end of the positioning sleeve 23 is installed on the lower positioning sleeve 25 through a spring B24, the positioning sleeve 23 compresses a spring B24, a center rod at the lower end of the positioning sleeve 23 is fixed with the lower positioning sleeve 25 through a fixing pin A26, the turnover sleeve 22 can complete the unlocking function of the B rod emergency driving device and the L rod emergency driving device, the turnover sleeve can be turned over after unlocking to expose the lower positioning sleeve 25, the positioning sleeve 25 is matched with the unlocking nut after the joint is further lifted, and a rotary tool can realize the unlocking; as shown in fig. 5, the spare driving head of the B-rod and L-rod manual automatic switching device comprises a bell mouth 27, a positioning rod 29 and a fixing pin B30, wherein the positioning rod 29 is installed in a through hole at the bottom center of the bell mouth 27, and the fixing pin B30 penetrates through the side wall at the bottom of the bell mouth 27 and the central shaft of the positioning rod to fix the positioning rod 29 and the bell mouth 27; through holes are arranged on the side wall of the bell mouth 27 and the side wall of the positioning rod 29, a pin 28 is arranged in the through holes, and the B rod and the L rod are manually and automatically switched by the pin 28; the bell mouth 27 is used for guiding; as shown in fig. 6 and 7, the emergency driving joint for the rod B and the rod L has a smaller inner diameter and is matched with the emergency driving screw for the rod B, the rod L and the bin; after the B rod and the L rod are automatically switched and the unlocking nut is unlocked, the B rod and the L rod emergency driving joint are connected with the driving screw rod, and the driving tool rotates to drive the B rod and the L rod to act; when the bin is driven, the bin is not manually and automatically switched and unlocked, and the B rod and the L rod emergency driving joint can be directly installed on the head of the tool to be used.

A remote emergency operation method for a heavy water reactor nuclear power station material loading and unloading machine comprises the following steps:

step 1, installing a remote emergency operation device of a heavy water reactor nuclear power station material loading and unloading machine;

step 1.1, removing a shielding plug on a bottom plate at a corresponding position on the lower part of the loading and unloading machine, and exposing a through hole of the bottom plate;

step 1.2, installing a middle guide bracket on a through hole of a bottom plate;

the middle guide bracket is arranged at the position of the fixed screw hole by utilizing the fixed screw hole on the bottom plate shielding plug and is fixed by utilizing a bolt;

step 1.3, separating a guide sleeve in the middle guide bracket, and reserving a space through which a long rod and a driving head pass;

step 1.4, installing a driving mechanism on the ground;

installing a lower support of the tool on the ground, assembling the driving rod and the manual automatic switching driving head, penetrating through a guide sleeve of the guide support to extend upwards, and connecting the lower part of the support with an upper joint of the driving gear box;

step 2, completing manual automatic switching operation by using an operating device;

step 2.1, closing the guide sleeve to guide the long driving rod, and adjusting the vertical angle of the long driving rod according to the requirement to enable the long driving rod to approach an operation target;

2.2, when the overall height of the tool is insufficient, continuously increasing the single-section middle connecting rod until the target height is reached;

2.3, enabling the driving head to enter the manual-automatic switching mechanism and be connected by utilizing an adjusting nut on the supporting plate, and locking an adjusting screw rod through a locking mechanism;

step 2.4, the driving handle is utilized to drive the gear box to rotate to drive the long rod to complete manual and automatic switching operation;

step 3, completing the unlocking operation of the emergency mechanism;

3.1, separating the driving head from the manual-automatic switching mechanism by using an adjusting nut, and locking an adjusting screw;

3.2, gradually reducing the single-section middle connecting rod, reducing the overall height of the long driving rod, detaching the manual-automatic switching driving head, and installing an unlocking driving head;

3.3, increasing a single-section middle connecting rod, and raising the overall height of the long driving rod until the long driving rod reaches the target height to complete the unlocking operation of the emergency mechanism;

step 4, completing the driving operation of the B rod and the L rod;

step 4.1, gradually reducing the single-section middle connecting rod, detaching the unlocking driving head, and installing a B rod driving head and an L rod driving head;

4.2, adding a single-section middle connecting rod until the target height is reached;

4.3, connecting the driving head with the emergency driving screw rod through the adjusting nut, and locking the adjusting screw rod through the locking mechanism;

4.4, rotating the long driving rod through the driving gear box to complete the driving operation of the B rod and the L rod;

and 5, finishing the operation and dismantling the tool.