CN211602258U - Clamping force testing device - Google Patents
Clamping force testing device Download PDFInfo
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- CN211602258U CN211602258U CN202020680204.5U CN202020680204U CN211602258U CN 211602258 U CN211602258 U CN 211602258U CN 202020680204 U CN202020680204 U CN 202020680204U CN 211602258 U CN211602258 U CN 211602258U
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Abstract
The utility model relates to a testing arrangement neighborhood, especially a clamping-force testing arrangement, the test head includes first measuring stick and second measuring stick, is equipped with the measuring part on the second measuring stick, is equipped with spacing portion on the first measuring stick, and the one end of first measuring stick is articulated mutually with the one end of second measuring stick, and the other end of second measuring stick is connected with the dynamometry part, and the dynamometry part can drive the motion of second measuring stick, makes the measuring part of second measuring stick parallel to each other with the spacing portion of first measuring stick. The utility model discloses a clamping-force testing arrangement, first measuring stick and second measuring stick receive the reaction force of framework, are simply supported beam structure form's stress state to the moment of flexure that first measuring stick and second measuring stick received that has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, reduced the deformation degree of measuring stick when measuring, thereby improved the measuring degree of accuracy.
Description
Technical Field
The utility model relates to a testing arrangement field, especially a clamping-force testing arrangement.
Background
In the nuclear industry, grids are used for fixing fuel rods, and the requirement for elastic elements (spring plates are often preferred in the field) for clamping in the grids is very high, namely, the clamping force cannot be too large, if the elastic elements are too large, the fuel rods are easy to be clamped, nuclear leakage occurs, and the elastic elements cannot be too small, otherwise, the fuel rods cannot be clamped, so that the clamping force of the springs of the grids must be detected before the grids are used.
As shown in fig. 1, it is common in the art to provide two measuring rods 4, penetrate through the grids 7, increase the distance between the opposite outer sides of the two measuring rods 4 to the same distance as the outer diameter of the fuel rod to simulate the fuel rod, and measure the acting force of the elastic member 71 on the measuring rods 4 by a force measuring device, so as to convert the acting force into the clamping force of the grids 7 on the fuel rod.
However, in the course of using the above solution, the skilled person finds that there are some problems with the solution:
because the cantilever of one end of the measuring rod 4 is arranged, and when the elastic part 71 on the measuring grid 7 applies acting force to the measuring rod 4, the elastic part 71 applies a large bending moment to the root of the measuring rod 4, when the specification and the size of the measuring grid 7 are small, the measuring rod 4 used for measuring the grid 7 is thin, so that the material used by the existing measuring rod 4 cannot bear the bending moment, and the measuring rod 4 is greatly deformed during measurement, thereby seriously affecting the accuracy of measurement.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: when testing the grid spring clamping force to prior art existence, a great moment of flexure can be applyed to the measuring stick root for measuring the clamping force, when the specification and size of measuring the grid is less, the measuring stick is very thin, lead to the used material of current measuring stick to be unable to bear above-mentioned moment of flexure, can cause the measuring stick great deformation to appear when measuring, thereby seriously influence the problem of the measuring degree of accuracy, a clamping force testing arrangement is provided, through changing the measuring stick into both ends simple beam structural style by cantilever structural style, thereby the moment of flexure that the measuring stick root received has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, the degree of deformation of measuring stick when measuring has significantly reduced, thereby the measuring degree of accuracy has been improved.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a clamping-force testing arrangement, includes the test head, the test head includes first measuring stick and second measuring stick, be equipped with the measuring part that can contact each other with the elastic component of grillage when measuring on the second measuring stick, be equipped with the spacing portion that can contact each other with the just protruding of grillage when measuring on the first measuring stick, the one end of first measuring stick with the one end of second measuring stick is articulated mutually, the other end of second measuring stick is connected with the dynamometry part, the dynamometry part can drive the motion of second measuring stick makes the measuring part of second measuring stick with the spacing portion of first measuring stick is parallel to each other.
When the device is used, one end of the first measuring rod is hinged with one end of the second measuring rod, so that the structure formed by the first measuring rod and the second measuring rod can open and close at one end far away from a hinge point, when the device is in work, the first measuring rod and the second measuring rod are closed mutually, then the first measuring rod and the second measuring rod are placed into a tested grillwork, after the device reaches a preset position, one end of the first measuring rod far away from the hinge point can be connected with a support or fixed on a base body, one end of the second measuring rod far away from the hinge point is connected with the force measuring part, at the moment, the other end of the second measuring rod is connected with the force measuring part, the force measuring part can drive the second measuring rod to move, the first measuring rod can be driven to rotate around the hinge point and the second measuring rod relatively, and the purpose that the first measuring rod and the second measuring rod respectively push the grillwork is achieved, when the second measuring rod pushes the grid, the second measuring rod can receive the reaction force of the grid, at the moment, the reaction force of the grid can be measured through the force measuring component, so that the clamping force corresponding to the grid is measured, in the test process, the measuring part on the second measuring rod is in contact with the elastic part of the grid, the limiting part on the first measuring rod is in contact with the rigid projection of the grid, and the part, clamped by the corresponding grid, of the fuel rod to be placed is generally a columnar body with the same section, so that the force measuring component can drive the second measuring rod to move, the measuring part of the second measuring rod is parallel to the limiting part of the first measuring rod, the direction of the action force of the elastic part on the measuring part is controlled, and the state of clamping the fuel rod by the grid is simulated more accurately.
In the operation process of the scheme, when the first measuring rod is subjected to the reaction force of the rigid projection, supporting points are arranged at two ends of the first measuring rod, so that the first measuring rod is in a stress state in a simply supported beam structure form, and compared with the stress of a cantilever of the measuring rod in the prior art, the bending moment applied to one end, close to the first support, of the first measuring rod is greatly reduced;
similarly, because the one end of second measuring stick is articulated mutually with first measuring stick, the other end with the dynamometry part is connected, makes when the second measuring stick receives the reaction force of framework, its both ends all have the strong point, and then makes the second measuring stick be the stress state of simple beam structure form, compares the measuring stick cantilever stress among the prior art, and the bending moment that the second measuring stick was close to dynamometry part one end root and received has significantly reduced.
To sum up, a clamping-force testing arrangement, the one end through first measuring stick is articulated mutually with the one end of second measuring stick for when first measuring stick and second measuring stick receive the reaction force of framework, be the stress state of simply supported beam structural style, thereby the moment of flexure that first measuring stick and second measuring stick received has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, the deformation degree of measuring stick when measuring has significantly reduced, thereby improved the measuring degree of accuracy.
Preferably, the other end of the first measuring rod is connected with the first support, that is, one end of the first measuring rod is hinged to one end of the second measuring rod, and the other end of the first measuring rod is connected with the first support.
Preferably, the second measuring rod is hinged to the force measuring component and/or the first measuring rod is hinged to the first support, so that opening and closing actions can be realized when the force measuring component or the first support moves linearly, and the opening angle of the second measuring rod and the opening angle of the first measuring rod can be controlled more easily by comparing the linear motion with arc swing, so that the clamped state of the fuel rod can be simulated better.
Preferably, the second measuring rod is hinged to the force measuring component, and the first measuring rod is fixedly connected with the first support.
The first measuring rod is fixedly connected with the first support, namely, the first measuring rod and the first support do not move relatively in the process that the first support and the force measuring component can move relatively.
Preferably, one of the first measuring rod and the second measuring rod is provided with a boss, the other is provided with a groove matched with the boss, and when the test head is closed, the boss is matched with the groove.
When the testing head is closed, the boss is matched with the groove, and the outer diameter of the testing head is smaller than the inner diameter of the grillwork;
the test head is capable of measuring the clamping force of the grid springs when the test head is open.
Because the inner diameter of the grillwork is generally smaller, one of the first measuring rod and the second measuring rod is provided with a boss, and the other measuring rod is provided with a groove matched with the boss, when the first measuring rod and the second measuring rod are closed, the boss is matched with the groove, and under the condition that the grillwork with the same inner diameter can be measured, the rigidity of the grillwork is better compared with a plate-shaped structure.
Preferably, the second measuring rod further comprises a connecting portion, one end of the connecting portion is hinged to the first measuring rod, the other end of the connecting portion is fixedly connected with one end, close to the first measuring rod, of the measuring portion, and one end, far away from the connecting portion, of the measuring portion is hinged to the force measuring component.
Preferably, when the lattice is measured by the test head, the distance between the measuring part and the limiting part is equal to the outer diameter of the fuel rod to be put in.
The fuel rods to be put in are the fuel rods which are measured by the test head and are correspondingly clamped by the grillwork.
Preferably, the first measuring rod and/or the second measuring rod are/is a structural member made of cemented carbide.
Preferably, the linear guide rail assembly further comprises a linear guide rail pair, the linear guide rail pair comprises a linear guide rail component and a slider component in sliding fit with the linear guide rail component, the first support and the force measuring component are both arranged on the slider component, one of the first support and the force measuring component can move relative to the slider component along the movement direction of the slider component, and the other one of the first support and the force measuring component is fixed relative to the slider component.
In order to ensure the certainty of the stress direction and reduce the measurement error, the relative sliding direction of the linear guide rail component and the sliding block component is consistent with the relative movement direction of the first support and the force measuring component, and meanwhile, the whole motion of the test head can be constrained into the motion in the clamping force direction by adopting the linear guide rail, so that the test head automatically adapts to the position in the grid in the opening process, the certainty of the stress direction is ensured, and the measurement error is reduced.
Preferably, a driving mechanism is arranged on the slider component, the driving mechanism is in driving connection with the force measuring component, and the driving mechanism can drive the force measuring component or the first support to move relative to the slider component along the moving direction of the slider component.
Preferably, the driving mechanism can drive the force measuring component to move relative to the slider component along the moving direction of the slider component.
Preferably, the linear guide rail component includes at least two air-floating pad groups arranged at intervals, the slider component includes an air-floating slide body, the air-floating slide body is in sliding fit with the air-floating pad groups, the first support and the force measuring component are both arranged on the air-floating slide body, one of the first support and the force measuring component can move relative to the air-floating slide body along the moving direction of the air-floating slide body, and the other is fixed relative to the slider component.
The common linear guide rail component can realize linear motion, but because the friction force of the guide rail is influenced by load, uncertainty exists, the measurement precision of the clamping force can be influenced, the scheme adopts the air-float sliding body and the air-float cushion to form the air-float guide rail component, and the measurement error caused by the friction force of the guide rail is greatly reduced.
Preferably, the number of the air bearing pad groups is two, and the two air bearing pad groups are respectively located at two ends of the slider component.
Preferably, the air floatation cushion group comprises a pipe frame, and an air floatation cushion in sliding fit with the air floatation sliding body is arranged on the inner wall of the pipe frame.
Preferably, the linear guide rail device further comprises a base, and the linear guide rail part is arranged on the base.
Preferably, the base is provided with a limiting component, and the limiting component is used for limiting the relative sliding of the linear guide rail component and the slider component.
In the process that the test head is inserted into the grillwork along the direction parallel to the opening direction of the grillwork, in order to prevent the test head from deviating towards one side and colliding with the grillwork to damage the grillwork, a limiting part is arranged on the base and relatively fixes the linear guide rail part and the sliding block part, and meanwhile, in the process, the test head is always closed, the first support and the force measuring part are relatively static, and the first support and the force measuring part are both static relative to the air-float sliding body, so that the situation that the test head deviates towards the side wall of the grillwork in the process of inserting the grillwork to cause the collision of the test head and the grillwork to damage the grillwork is avoided.
After the test head enters the grillwork to be in place, the limiting device relieves the limiting, so that the linear guide rail component and the sliding block component can slide relatively, the test head is in a free state in the clamping force direction, and then the test head moves to an open state through the force measuring component and the first support to finish the clamping force measurement.
Preferably, the base is further provided with a limiting component, and the limiting component is used for limiting the air-floating sliding body and the air-floating cushion to slide relatively.
In the process that the test head is inserted into the grillwork along the direction parallel to the opening of the grillwork, in order to prevent the test head from deviating towards one side and colliding with the grillwork to damage the grillwork, a limiting part is arranged on the base and fixes the air floatation sliding body and the air floatation cushion relatively.
After the test head enters the grillwork to be in place, the limiting device relieves the limiting, so that the air floatation sliding body and the air floatation cushion can slide relatively, the test head is in a free floating state in the direction of the clamping force, and after the test head is in the free floating state, the test head moves to an opening state through the force measuring part and the first support to finish the measurement of the clamping force.
Preferably, at least two limiting rods are arranged on one side, close to the limiting component, of the sliding block component at intervals, the limiting component is arranged in a rotating mode, and the limiting component can limit the limiting rods to move along the sliding direction of the sliding block component.
Preferably, a first protruding portion and a second protruding portion are arranged on a side wall of the limiting component, the first protruding portion and the second protruding portion extend towards the radially outer side of the limiting component, an opening state and a locking state are arranged on a rotation path of the limiting component, when the limiting component rotates to the locking state, at least one limiting rod abuts against one side, close to the force measuring component, of the first protruding portion, and at least one limiting rod abuts against one side, far away from the force measuring component, of the second protruding portion.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. a clamping-force testing arrangement, the one end through first measuring stick is articulated mutually with the one end of second measuring stick for when first measuring stick and second measuring stick receive the reaction force of framework, be the stress state of simply supported beam structural style, thereby the moment of flexure that first measuring stick and second measuring stick received has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, the deformation degree of measuring stick when measuring has significantly reduced, thereby the measuring degree of accuracy has been improved.
2. A clamping-force testing arrangement, the second measuring stick with the dynamometry part is articulated mutually and/or first measuring stick with first support is articulated mutually for also can realize opening and shutting the action when dynamometry part or first support linear motion, linear motion compares the pitch arc swing moreover, its easier control the second measuring stick with the angle that opens of first measuring stick, thereby simulate the state that the fuel rod was by the centre gripping better.
3. A clamping-force testing arrangement, and first measuring stick with one of them is provided with the boss of second measuring stick, another be provided with the recess of boss looks adaptation works as first measuring stick with when the second measuring stick is closed, the boss with the recess cooperatees, under the condition that can measure the same internal diameter framework, this mode sets up the platelike structure of comparing, and its rigidity is better.
4. A clamping-force testing arrangement, set up the relative slip direction of linear guide part and slider part and the relative movement direction of first support and dynamometry part unanimously, adopt linear guide to retrain the overall motion of test head for the ascending motion of clamping-force side simultaneously for the test head is opening the position in the in-process automatic adaptation framework, thereby guarantees the certainty of direction of force, reduces measuring error.
5. A clamping-force testing arrangement, adopt air supporting gliding mass and air supporting to fill up and constitute air supporting guide rail set spare, greatly reduced because of the measuring error that guide rail frictional force brought.
6. A clamping-force testing arrangement, set up spacing part on the base, spacing part is with linear guide part and slider part relatively fixed, the first straight closure of test, and relative static between first support and the dynamometry part, and first support and dynamometry part homogeneous phase are static to the air supporting gliding mass, so avoid the test head at the in-process that inserts the framework, skew towards the framework lateral wall, lead to the test head and the framework collision and damage the framework.
Drawings
Fig. 1 is a schematic structural diagram of a clamping force testing device in the prior art.
Fig. 2 is a schematic axial view of a structure of the clamping force testing device of the present invention.
Fig. 3 is a front view (closed state) of the structure of the clamping force testing device of the present invention.
Fig. 4 is a front view (open state) of the structure of the clamping force testing device of the present invention.
Fig. 5 is a schematic diagram (closed state) of the test grid of the clamping force testing device of the present invention.
Fig. 6 is a schematic diagram of the fitting of the test grid of the clamping force testing device of the present invention (in an open state).
Fig. 7 is a schematic diagram of the stress when the test head tests the grid according to the present invention.
Fig. 8 is a cross-sectional view taken along line a-a of fig. 6 according to the present invention.
Icon: 1-a test head; 11-a first measuring rod; 111-a limiting part; 12-a second measuring stick; 121-a measuring part; 122-a connecting portion; 13-a boss; 14-a groove; 2-a first support; 3-a force measuring component; 4-measuring rod; 5-a linear guide rail pair; 51-linear guide components; 510-air cushion group; 511-air cushion; 512-pipe frame; 52-a slider part; 521-an air-floating sliding body; 53-a stop lever; 54-a drive mechanism; 6-a base; 61-a stop member; 7-a framework; 71-an elastic member; 72-rigid convex.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 2 to 6, the clamping force testing apparatus according to this embodiment includes a testing head 1, where the testing head 1 includes a first measuring rod 11 and a second measuring rod 12, a measuring portion 121 capable of contacting with an elastic member 71 of a grid 7 during measurement is disposed on the second measuring rod 12, a limiting portion 111 capable of contacting with a rigid protrusion 72 of the grid 7 during measurement is disposed on the first measuring rod 11, one end of the first measuring rod 11 is hinged to one end of the second measuring rod 12, the other end of the second measuring rod 12 is connected to a force measuring component 3, and the force measuring component 3 can drive the second measuring rod 12 to move, so that the measuring portion 121 of the second measuring rod 12 is parallel to the limiting portion 111 of the first measuring rod 11.
In the above scheme, the force measuring component 3 may also be connected to one end of the first measuring rod 11, which is far from the hinge point, so that the force measuring component 3 can drive the first measuring rod 11 to move, and the measuring part 121 of the second measuring rod 12 is parallel to the limiting part 111 of the first measuring rod 11.
In addition, in a further preferable mode, the other end of the first measuring rod 11 is connected to the first support 2, or the other end of the first measuring rod 11 is connected to the base.
On the basis, in a further preferable mode, the second measuring rod 12 is hinged to the force measuring component 3 and/or the first measuring rod 11 is hinged to the first support 2, so that opening and closing actions can be realized when the force measuring component 3 or the first support 2 moves linearly, and compared with arc swinging, the linear movement can control the opening angle of the second measuring rod 12 and the opening angle of the first measuring rod 11 more easily, and the clamped state of the fuel rod can be simulated better.
Particularly preferably, the second measuring rod 12 is hinged to the force measuring part 3, and the first measuring rod 11 is fixedly connected to the first support 2.
The first measuring rod 11 is fixedly connected with the first support 2, that is, in the process that the first support 2 and the force measuring component 3 can move relatively, the first measuring rod 11 and the first support 2 do not move relatively.
In addition, in a further preferable mode, the first measuring rod 11 and/or the second measuring rod 12 are/is a structural member made of cemented carbide.
On the basis, in a further preferable mode, the other end of the first measuring rod 11 is connected with the first support 2, that is, one end of the first measuring rod is hinged to one end of the second measuring rod, and the other end of the first measuring rod is connected with the first support.
In addition to the above, in a further preferred embodiment, the linear guide pair 5 further includes a linear guide member 51 and a slider member 52 slidably engaged with the linear guide member 51, the first support 2 and the load cell member 3 are both disposed on the slider member 52, one of the first support 2 and the load cell member 3 is capable of moving relative to the slider member 52 along the moving direction of the slider member 52, and the other is fixed relative to the slider member 52.
In order to ensure the certainty of the stress direction and reduce the measurement error, the relative sliding direction of the linear guide rail component 51 and the slide block component 52 is consistent with the relative movement direction of the first support 2 and the force measuring component 3, and meanwhile, the whole motion of the test head 1 can be constrained into one-dimensional motion in the clamping force direction (horizontal direction) by adopting the linear guide rail, so that the test head 1 automatically adapts to the positions of a spring and a rigid bulge in a grid frame in the opening process, thereby ensuring the certainty of the stress direction and reducing the measurement error.
In particular, the linear guide rail set 5 may use a linear ball guide rail set.
On the basis, in a further preferable mode, a driving mechanism 54 is disposed on the slider member 52, the driving mechanism 54 is in driving connection with the force measuring member 3, and the driving mechanism 54 can drive the force measuring member 3 or the first support 2 to move relative to the slider member 52 along the moving direction of the slider member 52.
In addition to the above, it is further preferable that the driving mechanism 54 can drive the force measuring unit 3 to move relative to the slider member 52 along the moving direction of the slider member 52.
In addition to the above, it is further preferable that the linear guide member further includes a base 6, and the linear guide member 51 is provided on the base 6.
In addition to the above, it is further preferable that the base 6 is provided with a stopper member 61, and the stopper member 61 is configured to restrict the relative sliding between the linear guide member 51 and the slider member 52.
In addition to the above, it is further preferable that the base 6 is provided with a stopper member 61, and the stopper member 61 is configured to restrict the relative sliding between the linear guide member 51 and the slider member 52.
In the process that the test head 1 is inserted into the grid along the direction parallel to the opening of the grid, in order to prevent the test head 1 from deviating towards one side and colliding with the grid to damage the grid, a limiting part 61 is arranged on the base 6, the linear guide rail part 51 and the sliding block part 52 are relatively fixed by the limiting part 61, and meanwhile, in the process, the test head 1 is always closed, the first support 2 and the force measuring part 3 are relatively static, and the first support 2 and the force measuring part 3 are both static relative to the air floating sliding body 521, so that the situation that the test head 1 deviates towards the side wall of the grid in the process of inserting the grid to cause the collision of the test head 1 and the grid to damage the grid is avoided.
After the test head 1 enters the grid frame to be in place, the limiting device releases limiting, so that the linear guide rail component 51 and the slider component 52 can slide relatively, the test head 1 is in a free state in the clamping force direction, and then the test head 1 moves to an open state through the force measuring component 3 and the first support 2, so that the clamping force measurement is completed.
In the clamping force testing device of the present invention, one end of the first measuring rod 11 is hinged to one end of the second measuring rod 12, and the other end of the first measuring rod 11 is connected to the first support 2; one end of the second measuring rod 12 is hinged to one end of the first measuring rod 11, and the other end of the second measuring rod 12 is connected to the force measuring component 3.
When the device is used, one end of the first measuring rod 11 is hinged with one end of the second measuring rod 12, so that the structure formed by the first measuring rod 11 and the second measuring rod 12 can be opened and closed at one end far away from a hinge point, when the device is in use, the first measuring rod 11 and the second measuring rod 12 are closed mutually, then the first measuring rod 11 and the second measuring rod 12 are placed into a detected grid frame, after the device reaches a preset position, because one end of the first measuring rod 11 far away from the hinge point is connected with the first support 2, one end of the second measuring rod 12 far away from the hinge point is connected with the force measuring part 3, and the first support 2 and the force measuring part 3 move relatively, the first measuring rod 11 and the second measuring rod 12 can be driven to rotate relatively around the hinge point, so that the first measuring rod 11 and the second measuring rod 12 respectively push the grid frame, when the second measuring rod 12 pushes the grid, the second measuring rod 12 receives the reaction force of the grid, and at the moment, the reaction force of the grid can be measured through the force measuring component 3, so that the clamping force corresponding to the grid is measured.
In the testing process, the measuring part 121 on the second measuring rod 12 is in contact with the elastic part 71 of the grid 7, and the limiting part 111 on the first measuring rod 11 is in contact with the rigid protrusion 72 of the grid 7, so that the part of the fuel rod to be placed, which is clamped by the corresponding grid, is generally a columnar body with the same section, the force measuring part 3 can drive the second measuring rod 12 to move, so that the measuring part 121 of the second measuring rod 12 is parallel to the limiting part 111 of the first measuring rod 11, the direction of the acting force of the elastic part 71 on the measuring part 121 is controlled, and the state of the fuel rod clamped by the grid is simulated more accurately;
in the operation process of the scheme, when the first measuring rod 11 is subjected to the reaction force of the grillwork, supporting points are arranged at two ends of the first measuring rod, so that the first measuring rod 11 is in a stress state in a simply supported beam structure form, and compared with the cantilever stress of the measuring rod in the prior art, the bending moment applied to one end, close to the first support 2, of the first measuring rod 11 is greatly reduced;
similarly, because one end of the second measuring rod 12 is hinged to the first measuring rod 11, and the other end is connected to the force measuring component 3, when the second measuring rod 12 receives the reaction force of the grid, support points are arranged at both ends of the second measuring rod, so that the second measuring rod 12 is in a stress state of a simply supported beam structure, and compared with the cantilever stress of the measuring rod in the prior art, the bending moment applied to the root of the second measuring rod 12 close to one end of the force measuring component 3 is greatly reduced.
The beneficial effects of this embodiment: a clamping-force testing arrangement, one end through first measuring stick 11 and second measuring stick 12 is articulated mutually for when first measuring stick 11 and second measuring stick 12 receive the reaction force of framework, be the stress state of simply supported beam structural style, thereby the moment of flexure that first measuring stick 11 and second measuring stick 12 received has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, the deformation degree of measuring stick when measuring has significantly reduced, thereby the measuring degree of accuracy has been improved.
Example 2
As shown in fig. 2 to 7, the clamping force testing apparatus according to this embodiment is different from embodiment 1 in that one of the first measuring rod 11 and the second measuring rod 12 is provided with a boss 13, and the other is provided with a groove 14 adapted to the boss 13, and when the testing head 1 is closed, the boss 13 is engaged with the groove 14.
When the test head 1 is closed, the boss 13 is matched with the groove 14, and the outer diameter of the test head 1 is smaller than the inner diameter of the grillwork;
when the test head 1 is opened, the test head 1 can measure the clamping force of the grid spring.
Since the inner diameter of the grid is generally smaller, one of the first measuring rod 11 and the second measuring rod 12 is provided with a boss 13, and the other one of the first measuring rod 11 and the second measuring rod 12 is provided with a groove 14 matched with the boss 13, when the first measuring rod 11 and the second measuring rod 12 are closed, the boss 13 is matched with the groove 14, and under the condition that the grid with the same inner diameter can be measured, the mode is better in rigidity compared with a plate-shaped structure.
As shown in fig. 5 and 6, in a further preferable mode from the above, the first measuring rod 11 is a straight rod, the second measuring rod 12 includes a measuring part 121 and a connecting part 122, one end of the connecting part 122 is hinged to the first measuring rod 11, the other end of the connecting part 122 is fixedly connected to one end of the measuring part 121, and one end of the measuring part 121 far from the connecting part 122 is hinged to the force measuring part 3.
In addition, in a further preferable mode, the test head 1 has an open state and a closed state on an open/close path, and when the test head 1 is opened until the measuring part 121 is parallel to the first measuring rod 11, a distance between the measuring part 121 and the first measuring rod 11 is equal to an outer diameter of a fuel rod to be put in.
As shown in fig. 8, when the test head 1 tests the grids 7, the distance between the measuring part 121 and the first measuring rod 11 is equal to the outer diameter of the fuel rod. At this time, the measuring part 121 of the second measuring rod 12 and the stopper 111 of the first measuring rod 11 are parallel to each other, and the measuring part 121 can be ensured to receive the reaction force F of the elastic member 711The stopper 111 receives the reaction force F of the rigid projection 722,F1And F2Parallel to each other, the stress direction of the fuel rod is accurately simulated.
Example 3
As shown in fig. 2 to 4, a clamping force testing apparatus according to this embodiment is different from that of embodiment 1 or 2 in that the linear guide member 51 includes at least two air floating pad groups 510 arranged at intervals, the slider member 52 includes an air floating slide body 521, the air floating slide body 521 is slidably engaged with the air floating pad groups 510, the first support 2 and the force measuring member 3 are both arranged on the air floating slide body 521, and one of the first support 2 and the force measuring member 3 can move relative to the air floating slide body 521 along a moving direction of the air floating slide body 521, and the other is fixed relative to the slider member 52.
The ordinary linear guide rail part 51 can realize linear motion, but the friction force of the guide rail is influenced by load, uncertainty exists, the measurement precision of the clamping force can be influenced, an air-floating guide rail assembly is formed by the air-floating sliding body 521 and the air-floating cushion 511, and the measurement error caused by the friction force of the guide rail is greatly reduced.
In addition, in a more preferable mode, two air cushion groups 510 are provided and are respectively located at two ends of the slider member 52.
On the basis, in a further preferable mode, the air floatation pad group 510 includes a pipe frame 512, and an air floatation pad 511 in sliding fit with the air floatation sliding body 521 is disposed on an inner wall of the pipe frame 512.
The air-floating sliding body 521 is long and can be simultaneously in sliding fit with the air-floating pads 511 on at least two pipe frames 512 arranged at intervals.
The air-floating sliding body 521 is a long strip-shaped member with a rectangular cross section, at least four air-floating pads 511 are arranged on each pipe frame 512, and at least one air-floating pad 511 corresponds to each side surface of the air-floating sliding body 521.
In addition to the above, in a more preferable mode, the base 6 is further provided with a stopper 61, and the stopper 61 is configured to limit the relative sliding between the air-bearing slider 521 and the air-bearing pad 511.
In the process that the test head 1 is inserted into the grillage along the direction parallel to the opening of the grillage, in order to prevent the test head 1 from deviating towards one side and colliding with the grillage to damage the grillage, the base 6 is provided with the limiting part 61, the air-floating sliding body 521 and the air-floating cushion 511 are relatively fixed by the limiting part 61, and meanwhile, in the process, the test head 1 is always closed, the first support 2 and the force measuring part 3 are relatively static, and the first support 2 and the force measuring part 3 are both static relative to the air-floating sliding body 521, so that the situation that the test head 1 deviates towards the side wall of the grillage in the process of inserting the grillage to cause the collision of the test head 1 and the grillage to damage the grillage is avoided.
After the test head 1 enters the grid frame to be in place, the limiting device releases the limiting, so that the air floating sliding body 521 and the air floating pad 511 can slide relatively, the test head is in a free floating state in the clamping force direction, and after the test head is in the free floating state, the test head 1 moves to an open state through the force measuring part 3 and the first support 2 to finish the clamping force measurement.
In addition to the above, it is further preferable that at least two stopper rods 53 are provided at an interval on a side of the slider member 52 close to the stopper member 61, the stopper member 61 is rotatably provided, and the stopper member 61 can restrict movement of the stopper rods 53 in a sliding direction of the slider member 52.
In addition, in a more preferable aspect, a first protruding portion 531 and a second protruding portion 532 are provided on a side wall of the stopper member 61, the first protruding portion 531 and the second protruding portion 532 are both provided to extend radially outward of the stopper member 61, an open state and a locked state are provided on a rotation path of the stopper member 61, and when the stopper member 61 rotates to the locked state, at least one of the stopper rods 53 abuts against a side of the first protruding portion 531 close to the force measuring member 3, and at least one of the stopper rods 53 abuts against a side of the second protruding portion 532 away from the force measuring member 3.
The limiting component 61 is controlled to rotate or stop by a motor.
Example 4
As shown in fig. 2 to 6, the difference between the clamping force testing apparatus of this embodiment and the embodiments 1, 2 or 3 is that the structure of the conventional grid 7 generally includes: in the use process, the first measuring rod 11 and the second measuring rod 12 are closed mutually, then the first measuring rod 11 and the second measuring rod 12 are placed into the grid to be measured, after the preset position is reached, the first support 2 and the force measuring part 3 move relatively, namely the first measuring rod 11 and the second measuring rod 12 can be driven to rotate relatively around the hinge point, so that the first measuring rod 11 pushes the rigid protrusion 72 to support the second measuring rod 12, the second measuring rod 12 pushes the elastic member 71,
in the measuring process, the driving mechanism 54 pulls the second measuring rod 12 by pulling the force measuring part 3, so that the second measuring rod 12 rotates around the hinge joint of the first measuring rod 11 and the second measuring rod 12 at the hinge joint, the testing head 1 is opened, the elastic part 71 is compressed, meanwhile, under the action of a reaction force, the first measuring rod 11 is attached to the rigid protrusion 72, and the clamping force can be measured by the force value of the force measuring part 3 at the moment.
After the measurement is completed, the driving mechanism 54 drives the second measuring rod 12 to rotate reversely, so that the testing head 1 is closed, the pressure of the elastic member 71 is released, and the testing head 1 can be taken out in a non-contact state with the grid.
The driving mechanism 54 can generally select a stepping motor or a servo motor, which is generally provided with a grating position feedback sensor, and can precisely control the rotation angle of the second measuring rod 12 around the hinge point, so as to ensure that the distance between the elastic member 71 and the rigid protrusion 72 meets the measurement requirement after the second measuring rod 12 compresses the elastic member 71.
In order to ensure the certainty of the stress direction and avoid measurement errors, the overall motion of the test head 1 must be constrained to one-dimensional motion in the clamping force direction (generally, horizontal direction), so that the test head 1 can adapt to the positions of the elastic member 71 and the rigid protrusion 72 in the stretching process.
One-dimensional restraint can be realized by adopting a common linear guide rail, but the measurement precision of the clamping force can be influenced by the friction force of the guide rail (the friction force of the guide rail is influenced by load and has uncertainty), and the scheme adopts the air floatation cushion group 510 and the air floatation sliding body 521 to form the air floatation guide rail, so that the error caused by the friction force of the guide rail is avoided.
The force-measuring element 3 is preferably a tension sensor, and the elastic element 71 is typically a spring or a leaf spring.
In the operation process of the scheme, when the first measuring rod 11 is subjected to the reaction force of the grillwork, supporting points are arranged at two ends of the first measuring rod, so that the first measuring rod 11 is in a stress state in a simply supported beam structure form, and compared with the cantilever stress of the measuring rod in the prior art, the bending moment applied to one end, close to the first support 2, of the first measuring rod 11 is greatly reduced;
similarly, because one end of the second measuring rod 12 is hinged to the first measuring rod 11, and the other end is connected to the force measuring component 3, when the second measuring rod 12 receives the reaction force of the grid, support points are arranged at both ends of the second measuring rod, so that the second measuring rod 12 is in a stress state of a simply supported beam structure, and compared with the cantilever stress of the measuring rod in the prior art, the bending moment applied to the root of the second measuring rod 12 close to one end of the force measuring component 3 is greatly reduced.
To sum up, a clamping-force testing arrangement, one end through first measuring stick 11 and second measuring stick 12 is articulated mutually for when first measuring stick 11 and second measuring stick 12 receive the reaction force of framework, be the stress state of simply supported beam structural style, thereby the moment of flexure that first measuring stick 11 and second measuring stick 12 received has significantly reduced, thereby reduced the requirement of measurement process to measuring stick material strength, the deformation degree of measuring stick when measuring has significantly reduced, thereby the measuring degree of accuracy has been improved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (15)
1. A clamping force testing device is characterized by comprising a testing head (1), wherein the testing head (1) comprises a first measuring rod (11) and a second measuring rod (12), the second measuring rod (12) is provided with a measuring part (121) which can be contacted with the elastic piece (71) of the framework (7) during measurement, the first measuring rod (11) is provided with a limit part (111) which can be contacted with the rigid convex (72) of the framework (7) during measurement, one end of the first measuring rod (11) is hinged with one end of the second measuring rod (12), the other end of the second measuring rod (12) is connected with a force measuring component (3), the force measuring component (3) can drive the second measuring rod (12) to move, so that the measuring part (121) of the second measuring rod (12) is parallel to the limiting part (111) of the first measuring rod (11).
2. A clamping force testing device according to claim 1, characterized in that the other end of the first measuring rod (11) is connected to the first holder (2).
3. A clamping force testing device according to claim 2, characterized in that the second measuring rod (12) is articulated to the force measuring part (3) and/or the first measuring rod (11) is articulated to the first support (2).
4. A clamping force testing device according to claim 3, characterized in that said second measuring rod (12) is hinged to said force measuring member (3) and said first measuring rod (11) is fixedly connected to said first support (2).
5. A clamping force testing device according to claim 2, characterized in that one of said first measuring rod (11) and said second measuring rod (12) is provided with a boss (13) and the other with a recess (14) adapted to said boss (13), said boss (13) cooperating with said recess (14) when said testing head (1) is closed.
6. A clamping force testing device according to any one of claims 1-5, characterized in that the distance between the measuring part (121) and the limiting part (111) is equal to the outer diameter of the fuel rod to be placed when the grid (7) is measured by the testing head (1).
7. A clamping force testing device according to any one of claims 1-5, characterized in that the first measuring rod (11) and/or the second measuring rod (12) is a structural part made of cemented carbide.
8. A clamping force testing device according to any one of claims 2-5, further comprising a linear guide rail pair (5), wherein the linear guide rail pair (5) comprises a linear guide rail part (51) and a slider part (52) in sliding fit with the linear guide rail part (51), the first support (2) and the force measuring part (3) are both arranged on the slider part (52), and one of the first support (2) and the force measuring part (3) can move relative to the slider part (52) along the moving direction of the slider part (52).
9. A clamping force testing device according to claim 8, characterized in that a driving mechanism (54) is arranged on said slider member (52), said driving mechanism (54) is drivingly connected with said force measuring member (3), said driving mechanism (54) is capable of driving said force measuring member (3) or said first support (2) to move relative to said slider member (52) along the moving direction of said slider member (52).
10. The clamping force testing device of claim 8, wherein the linear guide rail member (51) comprises at least two air-floating pad groups (510) arranged at intervals, the slider member (52) comprises an air-floating slide body (521), the air-floating slide body (521) is in sliding fit with the air-floating pad groups (510), the first support (2) and the force measuring member (3) are both arranged on the air-floating slide body (521), and one of the first support (2) and the force measuring member (3) can move relative to the air-floating slide body (521) along the moving direction of the air-floating slide body (521).
11. The clamping force testing device of claim 10, wherein said air cushion sets (510) are two and located at two ends of said slider member (52).
12. The clamping force testing device of claim 11, wherein the air-floating pad group (510) comprises a pipe frame (512), and an air-floating pad (511) in sliding fit with the air-floating sliding body (521) is arranged on the inner wall of the pipe frame (512).
13. A clamping force testing device according to claim 8, further comprising a base (6), wherein said linear guide member (51) is arranged on said base (6).
14. A clamping force testing device according to claim 13, wherein said base (6) is provided with a limiting member (61), said limiting member (61) being adapted to limit the relative sliding movement of said linear guide member (51) and said slider member (52).
15. A clamping force testing device according to claim 14, wherein at least two limiting rods (53) are arranged at intervals on one side of the sliding block component (52) close to the limiting component (61), the limiting component (61) is arranged in a rotating way, an opening state and a locking state are arranged on a rotating path of the limiting component (61), and when the limiting component (61) rotates to the locking state, the limiting component (61) limits the sliding action of the sliding block component (52).
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| CN202020111399 | 2020-01-17 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112820429A (en) * | 2020-11-27 | 2021-05-18 | 中核北方核燃料元件有限公司 | Tool and method for detecting looseness of fuel element grid strap buckle |
| CN114137312A (en) * | 2020-11-02 | 2022-03-04 | 国网冀北电力有限公司检修分公司 | Loop resistance test assembly |
-
2020
- 2020-04-28 CN CN202020680204.5U patent/CN211602258U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137312A (en) * | 2020-11-02 | 2022-03-04 | 国网冀北电力有限公司检修分公司 | Loop resistance test assembly |
| CN114137312B (en) * | 2020-11-02 | 2023-12-22 | 国网冀北电力有限公司检修分公司 | Loop resistance test assembly |
| CN112820429A (en) * | 2020-11-27 | 2021-05-18 | 中核北方核燃料元件有限公司 | Tool and method for detecting looseness of fuel element grid strap buckle |
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