CN114937513A - Driving mechanism of loading and unloading equipment - Google Patents

Abstract

The invention belongs to the field of nuclear industry, and particularly relates to a driving mechanism of loading and unloading equipment, which is used for grabbing a fuel assembly in a pressure vessel of a reactor, and comprises a supporting sleeve (1) internally provided with a feed screw assembly (2) and a connecting rod mechanism (3), and a grabbing sleeve (4) arranged outside the lower end of the supporting sleeve (1) through the connecting rod mechanism (3); the feed screw assembly (2) is used for driving the connecting rod mechanism (3) to contract or extend, and when the connecting rod mechanism (3) is in a contracted state, the grabbing sleeve (4) is coaxial with the supporting sleeve (1); when the connecting rod mechanism (3) is in an extending state, the grabbing sleeve (4) is positioned on one side of the lower end of the supporting sleeve (1), the axes of the grabbing sleeve and the supporting sleeve are parallel, and the grabbing sleeve (4) is transversely displaced to be the distance between adjacent fuel assemblies in the pressure container. The fuel assemblies at adjacent positions are grabbed by the telescopic driving mechanism, so that the time for loading and unloading the fuel assemblies is shortened, namely the shutdown period is shortened.

Description

A drive mechanism for loading and unloading equipment

technical field

The invention belongs to the field of nuclear industry, and particularly relates to a driving mechanism for loading and unloading equipment.

Background technique

The pressure vessel of the reactor of the nuclear power plant is equipped with fuel assemblies. The loading and unloading equipment is one of the key equipments of the fuel operation system of the nuclear power plant. In general, the loading and unloading equipment in nuclear power plants realizes the precise positioning of grabbing fuel assemblies by controlling the large and small vehicles on the equipment.

If the top cover of the pressure vessel is not opened during the refueling, the loading and unloading equipment can only refuel through the fixed sleeve on the head of the pressure vessel. However, the position of the fixed sleeve at the top of the pressure vessel is fixed, and the diameter is small. The operation space for refueling through the fixed sleeve is limited, and it is very difficult to grasp the fuel assemblies around the fixed sleeve.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a driving mechanism for loading and unloading equipment, the technical solution of which can realize that the loading and unloading equipment can grab adjacent fuel assemblies at a fixed position (that is, fuel components in adjacent positions in the pressure vessel) through the telescopic function of the driving mechanism. assembly), thereby improving the loading and unloading efficiency of fuel assemblies.

In order to achieve the above purpose, the technical solution adopted in the present invention is a driving mechanism for loading and unloading equipment, which is used for grabbing the fuel assembly in the pressure vessel of the reactor, including a feeding screw assembly and a connecting rod mechanism inside. The supporting sleeve also includes a grabbing sleeve arranged outside the lower end of the supporting sleeve through the link mechanism; the feed screw assembly is used to drive the link mechanism to achieve contraction or expansion, when all the When the link mechanism is in a retracted state, the grab sleeve is coaxial with the support sleeve; when the linkage mechanism is in an extended state, the grab sleeve is located on the side of the lower end of the support sleeve , and the axes of the two are parallel. At this time, the lateral displacement of the grab sleeve is the distance between the adjacent fuel assemblies in the pressure vessel.

further,

The outer shell of the support sleeve is a cylinder, one side of the cylinder is provided with an opening, and when the link mechanism is in an extended state, it can extend from the opening to the outside of the cylinder, so that the catch The extraction sleeve is located on one side of the lower end of the support sleeve;

One side of the inner surface of the cylinder is provided with a bracket and a sliding groove for setting the feed screw assembly; the bracket includes a wire carrying bracket, a bearing bracket and a reducer bracket arranged in sequence from top to bottom, the wire The screw bracket is close to the top end of the support sleeve, and the sliding groove is located between the screw bracket and the bearing bracket;

The lower end of the cylinder is provided with a bottom plate, and the upper surface of the bottom plate is provided with a connecting rod support block;

The bottom plate and the bracket are fixedly connected with the cylinder by means of bolts or welding.

Further, the feed screw assembly includes a lead screw and a moving nut, a collar, a one-way thrust ball bearing, a shaft sleeve, a tightening nut, a reducer and a motor arranged on the lead screw.

Further, the upper end of the lead screw is provided with a retaining ring groove, and the retaining ring is used to axially fix the lead screw in the lead screw bracket, and the thread length on the upper part of the lead screw can meet the extension of the connecting rod mechanism. The middle part of the lead screw is provided with a boss, and a screw thread is provided below the boss; the shape of the lower end of the lead screw is processed in accordance with the interface of the output end of the reducer.

Further, the one-way thrust ball bearings are a pair, and are fitted on the lead screw between the boss and the tightening thread through the cooperation of the shaft sleeve and the collar, and through the tightening The nut and the tightening thread are fixed on the lead screw and arranged in the bearing bracket, and the one-way thrust ball bearing is used to reduce the radial load on the lead screw.

Further, the reducer is fixed on the reducer bracket with bolts, the input end of the reducer is connected to the motor, and the output end of the reducer is connected to the lower end of the lead screw for connecting the The power of the motor is transmitted to the lead screw, thereby driving the lead screw to rotate, and the moving nut cooperates with the upper thread of the lead screw to change the rotational movement of the lead screw into the vertical movement of the moving nut. Straight movement.

Further, the link mechanism includes a link, a link bracket and a positioning slider.

further,

The connecting rod includes a long connecting rod, a short connecting rod and a balance connecting rod;

The upper end of the long connecting rod and the upper end of the balance connecting rod are connected to the connecting rod bracket through the pin shaft; the lower end of the long connecting rod is fixed on the upper end of the grabbing sleeve;

The lower end of the long connecting rod and the lower end of the balance connecting rod are connected to the upper end of the grabbing sleeve through a pin shaft;

The lower end of the short connecting rod is connected to the connecting rod support block of the bottom plate through a pin shaft, and the upper end of the short connecting rod is connected to the midpoint of the long connecting rod through a pin shaft.

Further, the positioning slider and the moving nut are connected to the connecting rod bracket, and one end of the positioning slider passes through the sliding groove of the cylinder to restrict the rotation of the moving nut, so that the wire When the lever rotates, the moving nut drives the connecting rod bracket to move vertically up and down.

Further, the lower end of the short connecting rod and the upper end of the long connecting rod are co-located in the same vertical plane, and the connecting rod mechanism can realize contraction or extension through the vertical movement of the moving nut, thereby realizing the grabbing The horizontal movement of the sleeve position realizes the grabbing of the adjacent fuel assemblies in the pressure vessel by the grabbing sleeve position.

The beneficial effects of the present invention are:

1. The present invention realizes the grabbing of the fuel assemblies at adjacent positions through the expansion and contraction of the driving mechanism, which reduces the time for loading and unloading, that is, compresses the shutdown period and improves the economy.

2. Under the condition that the top cover of the pressure vessel is not opened during the refueling period, the present invention performs refueling through the fixed sleeve on the upper head of the pressure vessel, which can realize the loading and unloading of multi-point fuel assemblies at one time, and this function can reduce the number of pressure vessels. The opening of the upper head improves the safety of the reactor.

Description of drawings

1 is a schematic diagram of a drive mechanism of a loading and unloading device described in the specific embodiment of the present invention (when in a retracted state, the grabbing sleeve 4 is coaxial with the supporting sleeve 1);

Fig. 2 is a schematic diagram of a drive mechanism of a loading and unloading device described in the specific embodiment of the present invention (when in an extended state, the grab sleeve 4 is located on the lower end side of the support sleeve 1);

FIG. 3 is a schematic diagram of the support sleeve 1 described in the specific embodiment of the present invention;

4 is a schematic diagram of the feed screw assembly 2 described in the specific embodiment of the present invention;

FIG. 5 is a schematic diagram of the lead screw 13 described in the specific embodiment of the present invention;

6 is a schematic diagram of the link mechanism 3 described in the specific embodiment of the present invention;

FIG. 7 is a schematic diagram of the connecting rod in the connecting rod mechanism 3 described in the specific embodiment of the present invention (in a retracted state);

FIG. 8 is a schematic diagram of a link in the link mechanism 3 described in the specific embodiment of the present invention (in an extended state);

In the figure: 1-Support sleeve, 2-Feed screw assembly, 3-Link mechanism, 4-Grab sleeve, 5-Cylinder, 6-Screw bracket, 7-Sliding groove, 8-Bearing bracket, 9-reducer bracket, 10-connecting rod support block, 11-base plate, 12-movement nut, 13-lead screw, 14-collar, 15-one-way thrust ball bearing, 16-shaft sleeve, 17-tightening nut, 18-Reducer, 19-Motor, 20-Boss, 21-Tightening thread, 22-Link bracket, 23-Locating slider, 24-Long link, 25-Short link, 26-Balance link.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 and 2, the present invention provides a drive mechanism for loading and unloading equipment, which is used for grabbing the fuel assemblies in the pressure vessel of the reactor, including a feed screw assembly 2 and a connecting rod inside. The support sleeve 1 of the mechanism 3 also includes a grab sleeve 4 arranged outside the lower end of the support sleeve 1 through the link mechanism 3; the feed screw assembly 2 is used to drive the link mechanism 3 to realize contraction or extension, When the lever mechanism 3 is in a retracted state, the grabbing sleeve 4 is coaxial with the support sleeve 1, and the whole can pass through the fixed sleeve on the upper head of the pressure vessel; when the link mechanism 3 is in an extended state, the grabbing sleeve 4 It is located on the lower end side of the support sleeve 1, and the axes of the two are parallel. The grab sleeve 4 is not coaxial with the support sleeve 1. At this time, the grab sleeve 4 can grab the inside of the pressure vessel and located adjacent to the position below the fixed sleeve. At this time, the lateral displacement of the grab sleeve 4 is the distance between adjacent fuel assemblies in the pressure vessel.

As shown in FIG. 3 , the shell of the support sleeve 1 is a cylinder 5, and one side of the cylinder 5 is provided with an opening to leave space for the movement of the link mechanism 3. When the link mechanism 3 is in an extended state, the opening can be Extend to the outside of the cylinder 5, so that the grab sleeve 4 is located on the side of the lower end of the support sleeve 1;

A bracket and a sliding groove 7 are provided on one side of the inner surface of the cylinder 5 for setting the feed screw assembly 2; 6 Close to the top of the support sleeve 1, the sliding groove 7 is located between the screw bracket 6 and the bearing bracket 8;

The lower end of the cylinder 5 is provided with a bottom plate 11, and the upper surface of the bottom plate 11 is provided with a connecting rod support block 10;

The bottom plate 11 and the bracket are fixedly connected with the cylinder 5 by bolts or welding.

As shown in FIG. 4, the feed screw assembly 2 includes a lead screw 13 and a moving nut 12, a collar 14, a one-way thrust ball bearing 15, a shaft sleeve 16, a tightening nut 17, a reducer 18 and Motor 19.

As shown in FIG. 5 , the upper end of the lead screw 13 is provided with a retaining ring groove, and the retaining ring is used to axially fix the lead screw 13 in the lead screw bracket 6 . , the middle of the screw 13 is provided with a boss 20, and a screw thread 21 is provided below the boss 20;

The one-way thrust ball bearing 15 is a pair, and is set on the lead screw 13 between the boss 20 and the tightening thread 21 through the cooperation of the shaft sleeve 16 and the collar 14, and is fixed on the lead screw by tightening the nut 17 and tightening the thread 21. 13 and arranged in the bearing bracket 8, the one-way thrust ball bearing 15 is used to reduce the radial load on the screw 13.

The reducer 18 is fixed on the reducer bracket 9 with bolts, the input end of the reducer 18 is connected to the motor 19 , and the output end of the reducer 18 is connected to the lower end of the lead screw 13 for transmitting the power of the motor 19 to the lead screw 13 , thereby driving the lead screw 13 to rotate, and the moving nut 12 cooperates with the upper thread of the lead screw 13 , so that the rotational movement of the lead screw 13 can be changed into the vertical movement of the moving nut 12 .

As shown in FIG. 6 , the link mechanism 3 includes a link, a link bracket 22 and a positioning slider 23 .

As shown in Figures 7 and 8, the connecting rod includes a long connecting rod 24, a short connecting rod 25 and a balance connecting rod 26;

The upper end of the long connecting rod 24 and the upper end of the balance connecting rod 26 are connected to the connecting rod bracket 22 through the pin (rotatable); the lower end of the long connecting rod 24 is fixed on the upper end of the grab sleeve 4;

The lower end of the long link 24 and the lower end of the balance link 26 are connected to the upper end of the grab sleeve 4 through a pin (rotatable);

The lower end of the short link 25 is connected to the link support block 10 of the bottom plate 11 through a pin (rotatable), and the upper end of the short link 25 is connected to the midpoint of the long link 24 through a pin (rotatable) .

The positioning slider 23 and the moving nut 12 are connected to the connecting rod bracket 22. One end of the positioning slider 23 passes through the sliding groove 7 of the cylinder 5 to restrict the rotation of the moving nut 12, so that when the lead screw 13 rotates, the moving nut 12 drives the connecting rod The bracket 22 (ie, one end of the long link 24 and the balance link 26 ) moves vertically up and down.

The lower end of the short connecting rod 25 and the upper end of the long connecting rod 24 are in the same vertical plane, and the connecting rod mechanism 3 can realize the contraction or extension through the vertical movement of the moving nut 12, and then realize the horizontal movement of the grasping sleeve 4, thereby The grabbing of the adjacent fuel assemblies in the pressure vessel by the grabbing sleeve 4 is realized.

The device described in the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (10)

1. A drive mechanism for loading and unloading equipment for grabbing a fuel assembly in a pressure vessel of a reactor, characterized in that it comprises a support internally provided with a feed screw assembly (2) and a connecting rod mechanism (3). A sleeve (1), further comprising a grab sleeve (4) provided outside the lower end of the support sleeve (1) through the link mechanism (3); the feed screw assembly (2) is used for The link mechanism (3) is driven to realize contraction or extension, and when the link mechanism (3) is in a contracted state, the grab sleeve (4) is coaxial with the support sleeve (1); When the connecting rod mechanism (3) is in an extended state, the grabbing sleeve (4) is located on one side of the lower end of the support sleeve (1), and the axes of the two are parallel. 4) Lateral displacement is the distance between adjacent fuel assemblies within the pressure vessel. 2. The drive mechanism of a loading and unloading equipment as claimed in claim 1, wherein: The outer shell of the support sleeve (1) is a cylinder (5), one side of the cylinder (5) is provided with an opening, and the link mechanism (3) can extend from the opening when the link mechanism (3) is in an extended state to the outside of the cylinder (5), so that the grab sleeve (4) is located on the side of the lower end of the support sleeve (1); A bracket and a sliding groove (7) are provided on one side of the inner surface of the cylinder (5) for setting the feed screw assembly (2); the bracket includes wire carrying brackets (6) arranged in sequence from top to bottom ), a bearing bracket (8) and a reducer bracket (9), the lead screw bracket (6) is close to the top of the support sleeve (1), and the sliding groove (7) is located on the lead screw bracket (6) and between the bearing bracket (8); The lower end of the cylinder (5) is provided with a bottom plate (11), and the upper surface of the bottom plate (11) is provided with a connecting rod support block (10); The bottom plate (11) and the bracket and the cylinder (5) are fixedly connected by bolts or welding. 3. The drive mechanism of a loading and unloading equipment according to claim 2, wherein the feed screw assembly (2) comprises a lead screw (13) and a movement provided on the lead screw (13). Nut (12), collar (14), one-way thrust ball bearing (15), shaft sleeve (16), tightening nut (17), reducer (18) and motor (19). 4. A drive mechanism for loading and unloading equipment according to claim 3, characterized in that: the upper end of the lead screw (13) is provided with a retaining ring groove, and the lead screw (13) is axially fixed by the retaining ring. It is fixed in the lead screw bracket (6), the thread length of the upper part of the lead screw (13) can meet the length of the extension of the link mechanism (3), and the middle part of the lead screw (13) is provided with a boss (20), a tightening thread (21) is provided below the boss (20); the lower end of the lead screw (13) is processed in accordance with the output end interface of the reducer (18). 5. A driving mechanism for loading and unloading equipment according to claim 4, characterized in that: the one-way thrust ball bearings (15) are a pair, passing through the shaft sleeve (16) and the collar ( 14) The lead screw (13) is fitted on the lead screw (13) between the boss (20) and the tightening thread (21), through the tightening nut (17) and the tightening thread (21) Fixed on the lead screw (13) and arranged in the bearing bracket (8), the one-way thrust ball bearing (15) is used to reduce the radial load on the lead screw (13). 6. A drive mechanism for loading and unloading equipment according to claim 5, characterized in that: the reducer (18) is fixed on the reducer bracket (9) with bolts, and the reducer (18) The input end of the motor (19) is connected to the motor (19), and the output end of the reducer (18) is connected to the lower end of the lead screw (13) for transmitting the power of the motor (19) to the lead screw screw (13) to drive the screw (13) to rotate, and the movement nut (12) cooperates with the upper thread of the screw (13) to change the rotational movement of the screw (13) into Vertical movement of the moving nut (12). 7. A drive mechanism for loading and unloading equipment according to claim 6, wherein the link mechanism (3) comprises a link, a link bracket (22) and a positioning slider (23). 8. The drive mechanism of a loading and unloading equipment as claimed in claim 7, wherein: The connecting rod includes a long connecting rod (24), a short connecting rod (25) and a balance connecting rod (26); The upper end of the long connecting rod (24) and the upper end of the balance connecting rod (26) are connected to the connecting rod bracket (22) through a pin; the lower end of the long connecting rod (24) is fixed on the the upper end of the grabbing sleeve (4); The lower end of the long connecting rod (24) and the lower end of the balance connecting rod (26) are connected to the upper end of the grabbing sleeve (4) through a pin shaft; The lower end of the short connecting rod (25) is connected to the connecting rod support block (10) of the bottom plate (11) through a pin, and the upper end of the short connecting rod (25) is connected to the connecting rod through a pin on the midpoint of the long connecting rod (24). 9 . The driving mechanism for loading and unloading equipment according to claim 8 , wherein the positioning slider ( 23 ) and the moving nut ( 12 ) are connected to the connecting rod bracket ( 22 ), 10 . One end of the positioning slider (23) passes through the sliding groove (7) of the cylinder (5) to restrict the rotation of the moving nut (12), so that when the lead screw (13) rotates, the The moving nut (12) drives the connecting rod bracket (22) to move vertically up and down. 10. A drive mechanism for loading and unloading equipment according to claim 9, wherein the lower end of the short connecting rod (25) and the upper end of the long connecting rod (24) are co-located in the same vertical plane, The linkage mechanism (3) can realize contraction or extension through the vertical movement of the moving nut (12), thereby realizing the horizontal movement of the grabbing sleeve (4), thereby realizing the grabbing sleeve (4). 4) Grabbing the adjacent fuel assemblies in the pressure vessel.

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