Fuel rod transfer stop baffle device

Abstract

The present invention discloses a fuel rod transmission stop baffle device, which includes a rotating shaft screw, a hexagonal nut, a single-row angular contact ball bearing, a bracket seat, a hexagonal bolt, a hexagonal nut, a baffle, a baffle bracket, a pressure spring, a steel ball, a steel ball spring, a spring pressure plate and a hexagon socket bolt. The beneficial effects of the present invention are: (1) the fuel rod can be accurately stopped at any designated position (mainly used in front of the top material mechanism where there is a large height difference); (2) there is no new scratch (scratches, abrasions) or marks (scratches or abrasions) on the surface of the fuel rod after it stops; (3) the stopping position of each fuel rod is accurate and highly repeatable; (4) a variety of fuel rods of different lengths can be used; (5) there is no need to frequently disassemble and adjust the stop baffle; (6) it is easy to install, simple to operate, and has high conversion efficiency.

Description

Technical Field

[0001] The invention belongs to the field of machinery, and in particular relates to a fuel rod transmission stop baffle device. Background Art

[0002] The production of fuel rods requires multiple processes. During this process, after each manufacturing or inspection process, it must be transferred to the next process through a transmission device. Manufacturing and circulation are carried out alternately to finally produce qualified fuel rods. In the original production line layout, after the fuel rod transmission device is transmitted to the designated position, the fuel rod is transmitted to the next station through the lifting device (a device that transfers the fuel rod from a lower station to a higher station to eliminate the height difference). The fuel rod has a speed when it is transmitted through the transmission device. After the transmission wheel of the transmission device stops rotating, the fuel rod will move forward for a distance due to inertia. The distance of continued movement varies according to different accelerations and fuel rod weights. The position of the lifting device is fixed. The lifting device can lift the fuel rod evenly only when the fuel rod is at the designated position. Otherwise, the lifting mechanism may only lift part of the fuel rod, and the remaining part is still on the transmission device or suspended in the air, resulting in potential safety hazards such as bending of the fuel rod or falling to the ground and being scrapped. This is one of the main reasons for installing stop baffles on certain transmission stations. Another main reason is to prevent the fuel rods from not stopping in time in certain cases, continuing to move forward, or even rushing out of the transmission device and falling to the ground and being scrapped. In the above two cases, installing a stop baffle and coordinating with controlling the deceleration of the transmission wheel can effectively prevent the fuel rods from falling to the ground and being scrapped.

[0003] In order to avoid the problem of incorrect stopping position of fuel rods, the original production line has a polyethylene baffle installed on the transmission line material rack. The height is 10mm higher than the fuel rods. By controlling the speed of the transmission wheel, the fuel rods stop before reaching the baffle. However, there are some problems: (1) There is no special stopping device. The original polyethylene baffle can stop the fuel rods when they are about to arrive, but there is no complete set of equipment for coordinated control. (2) There is no compatibility. The length and position of the top material mechanism are fixed. In order to evenly distribute the weight of the fuel rods on the top material mechanism, the fuel rods need to stop at a certain position. Fuel rods of different lengths need to stop at different positions. One baffle cannot be used at the same time. (3) There is no electronic control matching. The original fuel rod stopping operation was carried out by adjusting the starting and ending speeds of the transmission wheel. However, the stopping positions of different fuel rods are different, and it is difficult to adjust the transmission wheel frequently for control. (4) Replacement is cumbersome and the conversion efficiency is low. In order to adapt to a variety of fuel rods, a baffle often needs to be disassembled and installed at different positions. The personnel adjustment is cumbersome and the conversion efficiency is low (by adjusting the baffle position to convert to the corresponding length of fuel rods). (5) Severe wear. Since the position of the baffle plate needs to be adjusted for different fuel rods, it needs to be disassembled frequently. As a result, the relative movement between the baffle plate and the material rack of the transmission device increases, resulting in severe wear. (6) Reduced repeat positioning accuracy. Due to the severe wear mentioned above, the markings are blurred, resulting in changes in the length position of a certain fuel rod when the baffle plate is reinstalled. In addition, the wear is too severe and the bolt structure can no longer be tightened, which will also reduce the positioning accuracy after installation. In summary, it is necessary to design a set of special fuel rod transmission stop baffle devices. Summary of the invention

[0004] The purpose of the present invention is to provide a fuel rod transmission stop baffle device, which can solve the problems of being unable to simultaneously accommodate multiple fuel rod product requirements, relying solely on the transmission wheel speed adjustment, cumbersome replacement, time-consuming and labor-intensive, and frequent disassembly and assembly, resulting in severe wear of the stop baffle and the transmission device rack, and low repeat positioning accuracy.

[0005] The technical solution of the present invention is as follows: a fuel rod transmission stop baffle device, which includes a rotating shaft screw, a hexagonal nut, a single-row angular contact ball bearing, a bracket seat, a hexagonal bolt, a hexagonal nut, a baffle, a baffle bracket, a pressure spring, a steel ball, a steel ball spring, a spring pressure plate and a hexagon socket bolt.

[0006] The rotating shaft screw and the hexagonal nut are connected together by bolts.

[0007] The single-row angular contact ball bearing is installed in the bracket seat and is used to directly support the rotating shaft screw to ensure its rotation.

[0008] The hexagonal bolts and hexagonal nuts are connected by bolts and used in combination to connect the baffle plate and the baffle plate bracket together.

[0009] The pressure spring is connected to the rotating shaft screw, and the pressing force of the spring is adjusted by screwing the rotating shaft screw in and out.

[0010] The steel ball is located in the bracket seat, and its two ends are respectively in contact with the baffle bracket and the steel ball spring.

[0011] The steel ball spring is in contact with the steel ball and the spring pressure plate respectively, wherein the steel ball at one end is controlled by its own elastic force, while the spring pressure plate at the other end can prevent the steel ball from falling out of the bracket seat.

[0012] The hexagon socket bolts fix the spring pressure plate on the bracket seat through a bolt structure.

[0013] The beneficial effects of the present invention are: (1) the fuel rod can be accurately stopped at any designated position (mainly used in front of the material pushing mechanism where there is a large height difference); (2) there is no new scratch (scratches, abrasions) or marks (scratches or abrasions) on the surface of the fuel rod after it stops; (3) the stopping position of each fuel rod is accurate and highly repeatable; (4) a variety of fuel rods of different lengths can be used; (5) there is no need to frequently disassemble and adjust the stop baffle; (6) it is easy to install, simple to operate, and has a high conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the fuel rod transmission stop baffle device provided by the present invention;

[0015] Figure 2 This is a left view of the fuel rod transfer stop baffle device provided by the present invention.

[0016] In the figure, 1 is a rotating shaft screw, 2 is a hexagonal nut, 3 is a single-row angular contact ball bearing, 4 is a bracket seat, 5 is a hexagonal bolt, 6 is a hexagonal nut, 7 is a baffle, 8 is a baffle bracket, 9 is a pressure spring, 10 is a steel ball, 11 is a steel ball spring, 12 is a spring pressure plate, and 13 is a hexagonal bolt. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 and Figure 2As shown, the fuel rod transmission stop baffle device includes a rotating shaft screw 1, a hexagonal nut 2, a single-row angular contact ball bearing 3, a bracket seat 4, a hexagonal bolt 5, a hexagonal nut 6, a baffle 7, a baffle bracket 8, a pressure spring 9, a steel ball 10, a steel ball spring 11, a spring pressure plate 12 and a hexagon socket bolt 13, wherein the rotating shaft screw 1 realizes the baffle 7 and the baffle bracket 8 to rotate on the bracket seat 4, and the rotating shaft screw 1 is connected to the hexagonal nut 2 and the pressure spring 9 respectively. The hexagonal nut 2 is fastened with the rotating shaft screw 1 by bolt connection, and the hexagonal nut 2 contacts the single-row angular contact ball bearing 3 and restricts it from withdrawing from the bracket seat 4. The single-row angular contact ball bearing 3 realizes the support and rotation of the rotating shaft screw 1, and the bearing is used to bear a certain axial force. The bracket seat 4 is the base of the whole device. It is fixed to the material rack of the transmission device through the four through holes at the bottom. It can be adjusted to different positions to meet the requirements of loading fuel rods of different lengths. Spherical through holes are respectively opened in the upper and middle parts so that the steel ball 10 and the steel ball spring 11 can be installed at the same time. The hexagonal bolt 5 and the hexagonal nut 6 are used in combination. The baffle 7 and the baffle bracket 8 are fixed together by the bolt structure to form a whole. The baffle 7 is a part used to stop the fuel rod from moving forward. It is a part that directly contacts the fuel rod, so polyethylene material is selected. It is divided into two parts with the baffle bracket 8 for easy replacement. The baffle 7 is often hit by the fuel rod and needs to be replaced in time after a period of use. If only the baffle 7 is replaced without disassembling other parts, it will be more efficient. The baffle bracket 8 and the baffle 7 are formed into a whole through the hexagonal bolts 5 and 6 (hexagonal nuts. Three hemispherical holes are opened on the baffle bracket 8, which are respectively located at the corresponding positions of 3 o'clock, 6 o'clock and 9 o'clock on the clock. The baffle angle is adjusted by a steel ball 10 that moves in and out of different hemispherical holes of the baffle bracket 8. Each rotation is 90°, and then the rotation is realized through the shaft screw 1. The pressure spring 9 is made of 65Mn material and is made through heat treatment to ensure wear resistance and spring elasticity. It is pressed into the shaft screw 1 to apply a pre-tightening force to prevent the shaft screw 1 from withdrawing from the hexagonal nut 2. It has a similar function to a spring washer, but the anti-retraction effect is better. The steel ball 10 is used to realize the baffle positioning. It is located in the spherical through hole of the bracket seat 4. Under the action of the ball spring 11, about 0.5mm is exposed from one end of the spherical through hole of the bracket seat 4 to fix the baffle bracket 8. When rotating 90°, the steel ball 10 squeezes the steel ball spring 11 to shrink a part, so that the baffle bracket 8 rotates. When rotating 90°, the steel ball 10 on the other side is squeezed by the steel ball spring 11 and is ejected, so that the baffle bracket 8 is fixed. The steel ball spring 11 is made of 65Mn material and is made by heat treatment. It is mainly used for preset pressure to ensure that the steel ball 10 extends a part to fix the baffle bracket 8 when it is positioned, and shrinks back into the spherical through hole of the bracket seat 4 when it rotates, playing a role in elastic force adjustment. It is directly connected to the steel ball 10 and the spring pressure plate 12, and is located in the spherical through hole of the bracket seat 4.The spring pressure plate 12 is used to limit the steel ball spring 11 from coming out of one end of the spherical through hole of the bracket seat 4, is connected to the steel ball spring 11 and the bracket seat 4, and is bolted to the bracket seat 4 through the hexagon socket bolt 13. The hexagon socket bolt 13 is used to fix the spring pressure plate 12.

[0019] The bottom of the device is an inverted T-shaped support seat, and the upper part is a flag-shaped support seat, which is connected by middle bolts and the like and can be positioned and rotated at 90 degrees.

[0020] According to the N types of fuel rods on the production line, N devices are placed at the corresponding positions of the transmission device (to ensure that each type of fuel rod can be evenly distributed on the top material structure). When the Nth type of fuel rod needs to be transmitted, it is only necessary to rotate the N-1 type and the baffle in front of it by 90° to make it lower than the height of the blocking fuel rod, so that it continues to move backward, and the length position of the Nth type of fuel rod remains upright. It is located at the length position of the Nth type of fuel rod. When the fuel rod reaches this position, it is stopped in time, where N = 2, 3...

[0021] (1) Fuel rods can be stopped at any position on the transmission line

[0022] A contact signal is installed on each set of stop baffles to determine the placement position according to the rotation speed. After the rotation speed is fixed, it can be ensured that the fuel rod of this type stops at the specified position every time, and at any position.

[0023] (2) Accurate fuel rod stop position and high repeatability

[0024] Since each set of stop baffles is installed with a contact signal, the fuel rod can be guaranteed to stop accurately each time, and the stop baffles do not need to be removed. When a certain position is needed, it can be achieved by simply rotating the front baffles 90° without installation or disassembly, so the repeatability is high.

[0025] (3) Compatible with fuel rods of different lengths

[0026] A stop baffle device is designed for each type of fuel rod (the stop baffle devices are exactly the same and are installed in different positions according to the length of the fuel rod). When the Nth type of fuel rod needs to be transported, it is only necessary to rotate the N-1 type and the baffles in front of it 90° to ensure that the Nth type of fuel rod is stopped in time, where N = 2, 3...

[0027] (4) Install once, use for a long time

[0028] Since each type of fuel rod has a separate stop baffle device, it only needs to be installed for the first time and can be used until the device fails.

[0029] (5)Easy to operate and high efficiency

[0030] Installation only requires fixing the four through holes of the device, and the device can be fixed on the transmission device. To achieve stopping of different fuel rods, only the front ones need to be rotated 90°. The purpose is to allow longer fuel rods to travel a longer distance to avoid interference. Since only manual rotation is required and no assembly or disassembly is required, the operation is convenient and efficient. The baffle is designed to be split, which is convenient for timely and quick replacement after damage without disassembling other parts.

[0031] (6) Easy to change and not easy to damage

[0032] The unique marble design allows the baffle to rotate 90° easily and quickly, and stay in this position for a long time. If a bolt structure is used directly, the bolts will fail and cannot be tightened after a period of use (for example, the fuel rod hits and does not hit the baffle, which will bring an alternating load to the baffle, and the bolts and nuts are in rigid contact, and they are prone to failure when frequently loaded). In addition, each replacement requires assembly and disassembly.

[0033] (7) Split baffle design for quick replacement

[0034] Since the baffle 7 is often hit by the tip of the fuel rod end plug, it needs to be replaced after a period of use. If it is designed as an integral type, the shaft screw 1, hexagonal nut 2, single-row angular contact ball bearing 3, pressure spring 9 and baffle need to be removed from the bracket seat 4 each time it is disassembled. During the disassembly process, there is a risk of the steel balls 10, steel ball springs 11 and spring pressure plates 12 falling off (without removing the entire device from the transmission device, the steel balls and the like in the entire device are at risk of falling off due to gravity). During the disassembly and assembly process, some positions may change, affecting the rotation flexibility of the baffle. For this reason, the baffle is designed to be divided into two parts, the baffle 7 and the baffle bracket 8, and the baffle 7 made of polyethylene can be replaced each time.

[0035] (8) Spherical marbles and slot design enable fast and accurate positioning of the baffle

[0036] The design is as follows: the baffle can block the fuel rods in the upright state, and the fuel rods can pass from the top after the baffle is rotated 90°. To practice this function, the design method of spherical marbles and slots is considered. The slot of the bracket seat 4 is designed to be a nearly spherical through hole, and one end of the through hole is successively loaded with a spring pressure plate 12, a steel ball spring 11 and a steel ball 10. A partial spherical hole is also opened on the baffle bracket 8. When it does not need to rotate, the steel ball 10 protrudes from the bracket seat 4 and enters the hemispherical groove of the baffle bracket 8. The baffle bracket 8 is now fixed. When it needs to be rotated, the steel ball 10 is completely pressed back into the bracket seat 4. Due to the steel ball spring 11, it has a certain elasticity and exits the hemispherical groove of the baffle bracket 8 to realize the rotation of the baffle bracket 8. When it is rotated exactly 90°, the steel ball 10 is acted upon by the elastic force of the steel ball spring 11 and pops out again, and a part of it enters the hemispherical hole of the baffle bracket 8 to realize fixation. Through the coordinated cooperation of several parts, the baffle bracket 8 can be quickly and accurately positioned automatically after being upright and rotated 90°.

[0037] (9) The application of pressure spring can better realize the rotation of baffle

[0038] The pressure spring has been heat-treated and has wear resistance and good expansion and contraction performance. Through proper adjustment and preset clamping force, the shaft screw 1 and the hexagonal nut 2 can be connected without being stuck or loosened. Compared with traditional spring washers, it has better anti-retraction function, stronger adjustment ability, and better synchronization with the shaft screw 1, so it is more suitable for this device.

Claims

1. A fuel rod transfer stop baffle device, characterized in that: It comprises a rotating shaft screw (1), a first hexagonal nut (2), a single-row angular contact ball bearing (3), a bracket seat (4), a hexagonal bolt (5), a second hexagonal nut (6), a baffle (7), a baffle bracket (8), a pressure spring (9), a steel ball (10), a steel ball spring (11), a spring pressure plate (12) and a hexagon socket bolt (13); The rotating shaft screw (1) and the first hexagonal nut (2) are connected together by bolts; The single-row angular contact ball bearing (3) is installed in the bracket seat (4) and is used to directly support the rotating shaft screw (1) to ensure its rotation; The hexagonal bolt (5) and the second hexagonal nut (6) are connected by bolts and used together to connect the baffle (7) and the baffle bracket (8); The pressure spring (9) is connected to the rotating shaft screw (1), and the pressing force of the spring is adjusted by screwing the rotating shaft screw (1) in and out; The steel ball (10) is located in the bracket seat (4), and its two ends are respectively in contact with the baffle bracket (8) and the steel ball spring (11); The steel ball spring (11) is in contact with the steel ball (10) and the spring pressure plate (12) respectively, wherein the steel ball (10) at one end is controlled by its own elastic force, while the spring pressure plate (12) at the other end can prevent it from falling out of the bracket seat (4); The hexagon socket bolt (13) fixes the spring pressure plate (12) to the bracket seat (4) via a bolt structure; The rotating shaft screw (1) is connected to the first hexagonal nut (2) and the pressure spring (9) respectively, and the hexagonal nut (2) is in contact with the single-row angular contact ball bearing (3); the upper part and the middle part of the bracket seat (4) are respectively provided with spherical through holes, and the steel balls (10) and the steel ball spring (11) are respectively installed therein; the baffle bracket (8) and the baffle (7) are integrally formed by the hexagonal bolts (5) and the second hexagonal nut (6); three hemispherical holes are provided on the baffle bracket (8), and the angle of the baffle is adjusted by the steel balls (10) extending in and out of different hemispherical holes on the baffle bracket (8), and then the rotation is realized by the rotating shaft screw (1); the spring pressure plate (12) is connected to the steel ball spring (11) and the bracket seat (4), and is bolted and fixed to the bracket seat (4) by the hexagonal bolts (13).

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