CN112053788A

CN112053788A - Pull rod and rod pulling machine with same

Info

Publication number: CN112053788A
Application number: CN202011070000.0A
Authority: CN
Inventors: 户进征; 张伟强
Original assignee: Beijing Xinlongli Automation Equipment Co ltd
Current assignee: Beijing Xinlongli Automation Equipment Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-08

Abstract

The invention relates to the technical field of fuel preparation, in particular to a pull rod and a rod pulling machine with the same. The pull rod comprises a pull claw and a pipe fitting, the pipe fitting is sleeved on the pull claw, and the pull claw has a claw extending state which extends out of one end of the pipe fitting under the driving of external force and a claw retracting state which enters the interior of the pipe fitting; the pulling claw comprises: the pull claw bodies are arranged at one end of the main body, and the pull claw bodies can be relatively far away and close to the axis of the pull claw; the pull claw also comprises a convex piece arranged on each pull claw body, the convex pieces are arranged in a convex manner towards the axis of the pull claw, the pull claw bodies and the convex pieces form a limiting space, and the limiting space is suitable for accommodating fuel rods; when the claw is in a claw-receiving state, a first gap is formed between at least one part of the inner wall of the pull claw body and the outer circumference of the fuel rod. The pull rod of the invention has low requirement on the coaxiality between the fuel rod and the pull rod.

Description

Pull rod and rod pulling machine with same

Technical Field

The invention relates to the technical field of fuel preparation, in particular to a pull rod and a rod pulling machine with the same.

Background

The nuclear fuel is an important clean energy source, the rod pulling process of the nuclear fuel rods generally pulls the fuel rods with the length of about 4m through the grids in the framework layer by layer until all the fuel rods are arranged in the grids, and the equipment for realizing the rod pulling process is generally called a rod pulling machine.

The existing rod pulling machine generally comprises a mounting platform, and a pull rod, a slide carriage mechanism and a rod selecting mechanism which are arranged on the mounting platform, wherein when the rod pulling machine works, the rod selecting mechanism selects a first pull rod, and the slide carriage mechanism drives the first pull rod to reciprocate on the mounting platform. Specifically, the pull rod penetrates through a fuel assembly framework arranged on a fuel assembly platform under the pushing of the slide carriage mechanism, reaches the fuel rod preassembly platform to clamp the fuel rod, and then retracts under the action of the slide carriage mechanism to pull the fuel rod into the fuel assembly framework.

The pull rod generally comprises a core rod and a pipe fitting sleeved on the core rod, the core rod is provided with a pull claw close to the pull rod, the pull claw is in a conical shape, one end of the pipe fitting is connected with the pull claw, the pull claw grabs the fuel rod when in a claw-expanding state during working, then the end part of the pipe fitting extrudes the pull claw and enables the pull claw to be in a claw-retracting state, and the fuel rod is clamped and fixed by the pull claw; when the fuel rod prepacking box is accurately aligned with the pull rod, the coaxiality error between the fuel rod and the pull rod is small, and the shear stress generated after the fuel rod is clamped and fixed by the pull claw is small; when the alignment accuracy of the fuel rod prepackage box and the tie rod is poor, the tie rod and the fuel rod may be deformed or damaged after the fuel rod is fixed. Therefore, when the conventional tie rod is used, the requirement on the coaxiality between the fuel rod and the tie rod is high.

Disclosure of Invention

Therefore, the invention provides a pull rod and a rod drawing machine with the same, and aims to solve the problem that the requirement on the coaxiality between a fuel rod and the pull rod is high when the pull rod in the prior art is used.

The technical scheme of the invention is as follows:

a pull rod comprises a pull claw and a pipe fitting, wherein the pipe fitting is sleeved on the pull claw, and the pull claw has a claw extending state and a claw retracting state, wherein the claw extending state is driven by external force to extend out of one end of the pipe fitting; the pulling claw comprises: the pull claw bodies are arranged at one end of the main body, and the pull claw bodies can be relatively far away and close to the axis of the pull claw; the pull claw also comprises a convex piece arranged on each pull claw body, the convex pieces are arranged in a convex manner towards the axis of the pull claw, the pull claw bodies and the convex pieces form a limiting space, and the limiting space is suitable for accommodating fuel rods; when the claw is in a claw-receiving state, a first gap is formed between at least one part of the inner wall of the pull claw body and the outer circumference of the fuel rod.

Preferably, the protruding piece is provided with a wedge-shaped portion, the wedge-shaped portion is provided with a first face, the first face is arranged close to one side of the main body, and the first face inclines relative to the axis of the pull claw.

Preferably, the end of the first face adjacent to the fuel rod is inclined away from the body.

Preferably, the pull claw body comprises a first cylindrical section, which is arranged at one end of the pull claw body far away from the main body.

Preferably, the pull pawl body further comprises: the second cylindrical section is connected with the first cylindrical section, and the radial size of the second cylindrical section is smaller than that of the first cylindrical section; the pull claw body further comprises a transition section arranged between the first cylindrical section and the second cylindrical section, and the transition section is conical.

Preferably, in the jaw-retracted state, a second gap is formed between the protrusion piece on the at least one pull jaw body and the outer peripheral wall of the fuel rod.

Preferably, four draw the claw body around the axis equipartition setting of drawing the claw, when receiving the claw state, two relative settings draw the claw body centre gripping fuel rod, form the second clearance between the fuel rod and the protruding piece on two relative settings draw the claw body in addition.

Preferably, in the jaw-retracted state, a third gap is formed between one end of the protrusion piece away from the main body and the fuel rod.

Preferably, the pull rod further comprises a core rod connected with the main body, and the external force is suitable for acting on the core rod and driving the core rod to move relative to the pipe fitting.

Preferably, the pull rod further comprises a guide cap, the guide cap is provided with a connecting end and a free end, the connecting end is sleeved on the pipe fitting, and the free end is conical.

Preferably, the core bar is provided with a guide key, and external force is suitable for driving the guide key to drive the core bar to move.

A rod drawing machine comprising: the pull rod mentioned above; and a power device acting on the core rod of the pull rod.

The technical scheme of the invention has the following advantages:

1. the pull rod comprises a pull claw and a pipe fitting, wherein the pipe fitting is sleeved on the pull claw, and the pull claw has a claw extending state and a claw retracting state, wherein the claw extending state is driven by external force to extend out of one end of the pipe fitting;

wherein draw the claw to include: the pull claw bodies are arranged at one end of the main body, and the pull claw bodies can be relatively far away and close to the axis of the pull claw; the pull claw also comprises a convex piece arranged on each pull claw body, the convex pieces are arranged in a convex manner towards the axis of the pull claw, the pull claw bodies and the convex pieces form a limiting space, and the limiting space is suitable for accommodating fuel rods;

when the pull claw is in a claw extending state, the pull claw grabs a fuel rod, a plurality of pull claw bodies are relatively far away from the axis of the pull claw, the fuel rod extends into the limit space, then the pull claw bodies are close to the axis of the pull claw, at the moment, the pull claw enters the interior and is in a claw retracting state, at the moment, a first gap is formed between at least one part of the inner wall of the pull claw body and the outer circumference of the fuel rod, and in the process of pulling the fuel rod, the fuel rod can move relative to the axis of the pull claw due to the arrangement of the first gap, the axes of the fuel rod and the pull claw are not required to be kept on the same straight line, so that the pull rod has low requirement on coaxiality between the fuel rod and the pull rod.

2. According to the pull rod, the wedge-shaped part is arranged on the protruding piece, the first surface is arranged close to one side of the main body, and the first surface inclines relative to the axis of the pull claw.

3. According to the pull rod, the pull claw body comprises the first cylindrical section, the first cylindrical section is arranged at one end, far away from the main body, of the pull claw body, the contact area between the pipe fitting and the pull claw body is larger in the claw folding state of the pull claw, and the pull claw body is prevented from being deformed due to extrusion of the pipe fitting.

4. In the tie bar of the present invention, the tab body further comprises: the second cylindrical section is connected with the first cylindrical section, and the radial size of the second cylindrical section is smaller than that of the first cylindrical section; the pull claw body also comprises a transition section arranged between the first cylindrical section and the second cylindrical section, and the transition section is conical; when drawing the claw and being in the claw state of opening, the pipe fitting tip is located the second cylinder section, draws the claw when receiving the claw, realizes receiving the claw by the second cylinder section through changeover portion to first cylinder section, through setting up the second cylinder section for draw the claw in the claw state of opening, the pipe fitting is bigger with the area of contact who draws the claw body, prevents to draw the claw body because of receiving the extrusion of pipe fitting and take place to warp.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a rod drawing machine of the present invention;

FIG. 2 is a schematic view of the structure of the drawbar shown in FIG. 1;

FIG. 3 is a schematic perspective view of the pull pawl of FIG. 2;

FIG. 4 is a schematic structural view of a pull tab of the present invention;

FIG. 5 is a schematic structural view of a guide cap of the present invention;

FIG. 6 is a schematic structural view of a partial cross-sectional view of the drawbar shown in FIG. 2;

fig. 7 is a schematic structural view of an enlarged view of the P portion shown in fig. 6.

Description of reference numerals:

1-pulling a claw body; 2-a protrusion; 3-a first gap; 4-a limiting space; 5-a second gap; 6-a wedge-shaped portion; 7-a first side; 8-a first cylindrical section; 9-a second cylindrical section; 10-a transition section; 11-a core rod; 12-a pipe piece; 13-a guide cap; 14-a fuel rod; 15-a third gap; 16-a guide key; 17-mounting a platform; 18-a tie rod; 19-power device.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

The embodiment provides a pull rod, as shown in fig. 1-7, including pulling the claw and pipe fitting 12, pipe fitting 12 cover is established on pulling the claw, pulls the claw and has the claw state that stretches out the one end of pipe fitting 12 under the drive of external force to reach the inside receipts claw state that gets into pipe fitting 12, wherein, pulls the claw and includes: the pull claw comprises a main body and at least two pull claw bodies 1 which are arranged in a radial mode, wherein the pull claw bodies 1 are arranged at one end of the main body, and the pull claw bodies 1 can be relatively far away from and close to the axis of the pull claw.

The pull claw also comprises a convex piece 2 arranged on each pull claw body 1, the convex pieces 2 are arranged in a convex mode towards the axis of the pull claw, the pull claw bodies 1 and the convex pieces 2 form a limiting space 4, and the limiting space 4 is suitable for containing a fuel rod 14; in the jaw-retracted state, a first gap 3 is formed between at least a part of the inner wall of the pull jaw body 1 and the outer circumference of the fuel rod 14. Note that the fuel rod 14 in the present embodiment is a fuel rod.

In the process of pulling the fuel rod 14, the fuel rod 14 can move relative to the axis of the pull claw due to the first gap 3, and the fuel rod 14 and the axis of the pull claw do not need to be kept on the same straight line, so that the requirement of the pull rod on the coaxiality between the fuel rod 14 and the pull rod is low.

Wherein, be equipped with wedge portion 6 on the bellying 2, wedge portion 6 is equipped with first face 7, and first face 7 is close to main part one side setting, and first face 7 is relative draw the axis of claw to take place the slope, and the pull rod is at the in-process that draws fuel rod 14, and fuel rod 14 is minimum with first face 7 area of contact, and fuel rod 14 is changeed the axis activity of drawing the claw relatively, specifically, the slope of keeping away from the main part direction takes place for the one end that first face 7 is close to fuel rod 14.

As an alternative embodiment, the end of the first face 7 remote from the fuel rod 14 is inclined away from the body.

Further, the pull claw body 1 comprises a first cylindrical section 8, which is arranged at one end of the pull claw body 1 far away from the main body. Through setting up first cylinder section 8, make and draw the claw to be bigger at the area of contact who receives claw state pipe fitting 12 and draw claw body 1, prevent on the one hand to draw claw body 1 and take place to warp because of the extrusion that receives pipe fitting 12, on the other hand, traditional tapered draw the claw when using, because pipe fitting 12 is big with the draw length-diameter ratio of claw, many pull rod sizes are difficult to keep unanimous, pipe fitting 12 is different with the distance that draws claw body 1 tip, each draws the claw to stretch out the claw degree also different, the too big condition that leads to the fuel rod to drop of claw exists.

The pull claw body 1 further includes: a second cylindrical section 9 connected to the first cylindrical section 8 and having a radial dimension smaller than the first cylindrical section 8; the pull claw body 1 further comprises a transition section 10 arranged between the first cylindrical section 8 and the second cylindrical section 9, and the transition section 10 is conical.

The pull rod of the embodiment further comprises a core rod 11 connected with the main body, external force is suitable for acting on the core rod 11 and driving the core rod 11 to move relative to the pipe fitting 12, when the pulling claw is in a claw-stretching state, the end part of the pipe fitting 12 is located on the second cylindrical section 9, and the radial size of the second cylindrical section 9 is smaller than that of the core rod 11.

Draw the claw when receiving the claw, by second cylinder section 9 through changeover portion 10 to first cylinder section 8 realization receipts claw, through setting up second cylinder section 9, on the one hand, make to draw the claw in the claw state of opening, pipe fitting 12 is bigger with the area of contact who draws claw body 1, prevent to draw claw body 1 because of receiving the extrusion of pipe fitting 12 and take place to warp, on the other hand, because set up second cylinder section 9, so the tapering of changeover portion 10, when the tapering is less, pipe fitting 12 and the extrusion force of drawing between the claw body 1 are littleer.

In the jaw-closing state, a second clearance is formed between the convex piece 2 on at least one pull jaw body and the outer peripheral wall of the fuel rod 14. By providing the second gap 5, the contact area of the fuel rod 14 with the first face 7 is further reduced, so that the fuel rod 14 is more easily movable relative to the axis of the pull pawl.

Further, draw claw body 1 to be provided with four, four draw claw body 1 to wind draw the axis equipartition of claw and set up, wherein two relative settings draw claw body 1 centre gripping fuel rod 14, when two relative settings draw claw body 1 centre gripping fuel rod 14 back, play assistance-localization real-time and centering effect to fuel rod 14, two relative settings in addition draw protruding piece 2 on the claw body 1 with form between the fuel rod 14 second clearance 5 to guarantee that fuel rod 14 is changeed the axis activity of drawing the claw relatively.

As an alternative embodiment, a second clearance is formed between the convex pieces 2 on all the pulling claw bodies and the peripheral wall of the fuel rod 14, so that the contact between the pulling claws and the fuel rod is further reduced, and the fuel rod is only applied with the acting force exerted by the first surface along the axial direction of the pulling claws during the rod pulling process of the pull rod.

In the jaw-closing state, a third gap 15 is formed between one end of the protrusion piece 2, which is far away from the main body, and the fuel rod 14, specifically, an annular groove is formed on the fuel rod 14, and the fuel rod 14 and a groove wall of the annular groove form the third gap 15.

The reason why the third gap 15 is provided is: the sizes of the fuel rods 14 arranged in the pre-assembly box are deviated, and the positions of the annular grooves of the fuel rods 14 are not parallel and level, so that when the pull rod of the embodiment is used, the pull claws cannot be clamped with the fuel rods 14, or the pull rod is clamped with the fuel rods 14 but not clamped at the annular grooves, and the pull claws cannot achieve claw receiving action.

By providing the third gap 15, the size of the third gap 15 formed between each fuel rod 14 and the protrusion 2 at different positions is different when the tie rod is engaged with the annular groove of each fuel rod 14.

The pull rod of this embodiment still includes direction cap 13, and it has link and free end, and the link overlaps on pipe fitting 12, and the free end is the tapered, and when receiving the claw state, draw the claw and enter into inside pipe fitting 12, and direction cap 13 is installed on pipe fitting 12. The guide cap 13 of this embodiment is for current guide cap, owing to be provided with first cylinder section 8, the radial dimension of first cylinder section 8 is drawn the claw for current tapered and is littleer, and consequently the size of guide cap is littleer, passes the in-process of fuel assembly skeleton at the pull rod, and difficult and grid on the fuel assembly skeleton takes place to block, and then damages the pull rod.

In the pull rod of this embodiment, the guide key 16 is disposed on the core rod 11, and an external force is suitable for driving the guide key 16 to drive the core rod 11 to move, where the external force may be an air cylinder or a motor acting on the guide key 16, and since the related structure of the external force driving the guide key 16 is irrelevant to the invention of this embodiment, it is not described herein again.

Example two

The embodiment provides a rod drawing machine, which comprises a plurality of pull rods 18 in the first embodiment; and the power device 19 acts on the core rod 11 of the pull rod 18, the power device 19 is a slide carriage mechanism, and in the rod drawing machine of the embodiment, because the first gap 3 is arranged on the pull rod 18, the fuel rod 14 can move relative to the axis of the drawing claw, and the fuel rod 14 and the axis of the drawing claw do not need to be kept on the same straight line, the pull rod 18 of the embodiment has low requirement on the coaxiality between the fuel rod 14 and the pull rod 18.

The rod drawing machine of the embodiment further comprises a mounting platform 17, and a pull rod 18 is arranged between the mounting platform and the slide carriage mechanism.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims

1. The pull rod is characterized by comprising a pull claw and a pipe fitting (12), wherein the pipe fitting (12) is sleeved on the pull claw, and the pull claw is in a claw extending state and a claw retracting state, wherein the claw extending state extends out of one end of the pipe fitting (12) under the driving of external force, and the claw retracting state enters the inside of the pipe fitting (12);

the pull claw includes:

a main body;

the pull claw comprises at least two pull claw bodies (1) which are arranged in a radial mode and are arranged at one end of the main body, and the pull claw bodies (1) can be relatively far away from and close to the axis of the pull claw;

the pull claw comprises pull claw bodies (1) and protruding pieces (2) arranged on each pull claw body (1), wherein the protruding pieces (2) protrude towards the axis of each pull claw, the pull claw bodies (1) and the protruding pieces (2) form limiting spaces (4), and the limiting spaces (4) are suitable for accommodating fuel rods (14);

when in a claw-closing state, a first clearance (3) is formed between at least one part of the inner wall of the pull claw body (1) and the outer circumference of the fuel rod (14).

2. A drawbar according to claim 1, characterized in that a wedge (6) is provided on the nose piece (2), the wedge (6) being provided with a first face (7), the first face (7) being provided adjacent to the main body side, the first face (7) being inclined with respect to the axis of the drawbar.

3. Tie rod according to claim 2, characterized in that the end of the first face (7) close to the fuel rod (14) is inclined away from the body.

4. A drawbar according to any one of claims 1-3, characterized in that the draw claw body (1) comprises a first cylindrical section (8) provided at an end of the draw claw body (1) remote from the main body.

5. The tie rod according to claim 4, characterized in that the draw claw body (1) further comprises:

a second cylindrical section (9) connected to the first cylindrical section (8) and having a smaller radial dimension than the first cylindrical section (8);

and the transition section (10) is arranged between the first cylindrical section (8) and the second cylindrical section (9), and the transition section (10) is conical.

6. Tie rod according to claim 1, wherein in the collapsed condition a second gap (5) is formed between the boss (2) on at least one of the draw claw bodies and the outer peripheral wall of the fuel rod (14).

7. The tie rod of claim 6, wherein the draw claw bodies (1) are provided with a plurality of groups, each group of draw claw bodies (1) is symmetrically arranged relative to the axis of the main body, when in a claw-retracting state, the plurality of groups of draw claw bodies (1) clamp the fuel rod, and the second gap (5) is formed between the bulge pieces (2) on the other groups of draw claw bodies (1) and the fuel rod (14).

8. Draw rod according to claim 1 or 6, characterized in that in the collapsed state a third gap (15) is formed between the end of the protruding element (2) remote from the body and the fuel rod (14).

9. A tie rod according to claim 1, further comprising a core rod (11) connected to the body, the core rod (11) being adapted to be acted upon by an external force and to move the core rod (11) relative to the tube (12).

10. A tie rod according to claim 8, further comprising a guide cap (13) having a connecting end that is sleeved on the tubular element (12) and a free end that is tapered.

11. The draw bar according to claim 9, wherein the core bar (11) is provided with a guide key (16), and an external force is suitable for driving the guide key (16) to drive the core bar (11) to move.

12. A rod drawing machine, comprising:

the tie rod of any one of claims 1-11;

a power device (19) acting on the core rod (11) of the pull rod.