CN114544118B - Special fixture for compression test of positioning grid springs - Google Patents
Special fixture for compression test of positioning grid springs Download PDFInfo
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- CN114544118B CN114544118B CN202210073304.5A CN202210073304A CN114544118B CN 114544118 B CN114544118 B CN 114544118B CN 202210073304 A CN202210073304 A CN 202210073304A CN 114544118 B CN114544118 B CN 114544118B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0075—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by means of external apparatus, e.g. test benches or portable test systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of mechanical property test, and discloses a special fixture for positioning grid spring compression test, wherein a spring compression assembly comprises two grid lower fixtures, two grid upper fixtures and two ejector rods; in the loading process, the upper and lower ends of the ejector rod are simultaneously forced by the upper grid clamp and the lower grid clamp, and the middle area of the ejector rod is used for being inserted into the positioning grid to uniformly contact with the springs in the positioning grid; the positioning grid holding component comprises a bracket support, two guide rails and two sliding blocks; the bracket support is positioned between the left and right grid lower clamps and the grid upper clamps and is arranged between the front guide rail and the rear guide rail through the sliding blocks; the positioning grid can move back and forth in the support, and the support can drive the positioning grid to move left and right, so that the position of the ejector rod in the positioning grid is adjusted. The invention can not only ensure that the position of the positioning grid is kept unchanged in symmetrical loading, but also test the internal springs at different positions respectively, thereby obtaining the force-displacement curve of the spring piece.
Description
Technical Field
The invention belongs to the technical field of material mechanics tests, and particularly relates to a special fixture for compression testing of a spacer grid spring in a pressurized water reactor fuel assembly.
Background
The pressurized water reactor fuel assembly is used as the core component of the pressurized water reactor and mainly comprises fuel bundles, a positioning grid, an upper mounting seat, a lower mounting seat and the like. The grid is formed by welding a series of strips which are regularly arranged in a crossing mode, so that grid elements which are regularly arranged are formed, each grid element clamps and positions fuel rods through four grid inner rigid protrusions and two three-bent springs, and the special structures of a plurality of cuboid grooves are formed in the appearance of the cuboid-shaped grid. For the entire fuel assembly, structural integrity issues of the spacer grid, including compression set behavior of the spacer grid springs, are important considerations. Under the existing technical conditions, the conventional clamp cannot clamp, and how to perform compression test of the spacer grid springs becomes a new problem, so that it is necessary to design a special spacer grid spring compression test clamp.
Disclosure of Invention
The invention provides a special fixture for compression test of a positioning grid spring, which can ensure that the positioning grid is kept unchanged in position in symmetrical loading, and simultaneously can respectively test internal springs at different positions of the positioning grid, so as to measure the compression deformation behavior of the positioning grid spring of a fuel assembly and obtain a force-displacement curve of a spring piece.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a special fixture for a compression test of a positioning grid spring, which comprises a spring compression assembly and a positioning grid holding assembly;
the spring compression assembly comprises a left grid lower clamp, a right grid upper clamp and a left ejector rod; the left grid lower clamp, the grid upper clamp and the ejector rod are connected with each other to form a rectangular frame body, and the right grid lower clamp, the grid upper clamp and the ejector rod are connected with each other to form a rectangular frame body; rectangular frame bodies formed on two sides are arranged on the same plane, two ejector rods are relatively close, and two grid lower clamps and two grid upper clamps are relatively far away;
the two grid lower clamps are identical in structure and are symmetrically arranged, and each grid lower clamp is of a right-angle structure; the tops of the two grid lower clamps are respectively fixed on standard clamps on the left and right cross beams of the testing machine through first screws; the two upper grid clamps are identical in structure and are symmetrically arranged, and each upper grid clamp is of a right-angle structure; the bottoms of the two grid upper clamps are respectively connected with the tops of the two grid lower clamps through pins; the lower ends of the two ejector rods are respectively and fixedly connected to the bottoms of the two grid lower clamps through second screws, and the upper ends of the two ejector rods are respectively inserted into the matching holes at the tops of the two grid upper clamps; in the loading process, standard clamps on left and right cross beams of the testing machine apply force to the upper and lower ends of the ejector rod through the upper grid clamp and the lower grid clamp, and the middle area of the ejector rod is used for being inserted into a positioning grid to uniformly contact with springs in the positioning grid;
the positioning grid holding assembly comprises a bracket support, a front guide rail, a rear guide rail and a front sliding block and a rear sliding block; the bracket support is positioned between the grid lower clamp and the grid upper clamp;
the bracket support comprises a left side plate and a right side plate which are parallel to each other, the bottoms of the two side plates are connected with a bottom plate, and the front and the rear of the two side plates are respectively connected with two wing plates; a positioning grid is arranged between the two side plates, the positioning grid is in clearance fit with the side plates, and the bottom of the positioning grid is supported on the bottom plate; a space exists between the bottom plate and the grid lower clamp, and the ejector rod passes through a through hole formed in the bottom plate;
the two wing plates extend out from the front and rear sides of the side plates respectively, each wing plate is connected with a sliding block, the sliding blocks are arranged on the front and rear guide rails, the guide rails are fixed on the testing machine, and the sliding blocks can drive the support to slide along the guide rails in a straight line;
the positioning grid can move back and forth in the support, and the support can drive the positioning grid to move left and right, so that the position of the ejector rod in the positioning grid is adjusted to test internal springs at different positions in the positioning grid.
Further, the grid lower clamp is of a right-angle structure formed by integrally formed vertical beams and transverse beams, and the transverse beams are all positioned at the bottoms of the vertical beams; the top end of the vertical beam of the grid lower clamp is provided with an outwards extending connector, the connector is provided with a bolt hole in the vertical direction and a pin hole, the bolt hole is used for installing the first screw, and the pin hole is used for installing the pin; the transverse beam tail end of the grid lower clamp is provided with a square groove, a threaded hole in the horizontal direction is formed in the square groove, and the threaded hole is used for installing the second screw.
Further, the grid upper clamp is of a right-angle structure formed by integrally formed vertical beams and transverse beams, and the transverse beams are positioned at the tops of the vertical beams; the bottom end of the vertical beam of the grid upper clamp is provided with an outwards extending connector, the connector is provided with a bolt hole in the vertical direction and a pin hole, the bolt hole is used for assembling and disassembling the first screw, and the pin hole is used for installing the pin; and the tail end of the transverse beam of the grid upper clamp is provided with a matching hole for being inserted into the upper end of the ejector rod.
Further, a rectangular notch is cut in the middle of the side plate
The beneficial effects of the invention are as follows:
the special fixture for the compression test of the positioning grid springs is characterized in that the connection between the ejector rod in the spring compression assembly and the upper fixture of the grid is designed in such a way that the upper fixture of the grid and the lower fixture of the grid are easy to install and disassemble by a manipulator, so that the radiation protection requirement of the external hot chamber environment during the compression test of the positioning grid springs is better met.
The special fixture for the compression test of the positioning grid springs ensures that the positions of the positioning grids are unchanged in the symmetrical loading process, and more importantly, the ejector rods are always in uniform contact with the springs in the positioning grids in the symmetrical loading process, so that the influence of bending moment in the loading process is avoided.
The special fixture for the compression test of the positioning grid springs can effectively fix the left and right positions of the positioning grid by the support of the positioning grid holding assembly, is convenient for a manipulator to place the positioning grid, ensures that the positioning grid does not deflect in the test process, and simultaneously ensures that the left and right errors of the placement of the manipulator are not influenced by the large contact surfaces of the support and the ejector rod with the positioning grid.
And fourthly, the special fixture for the compression test of the positioning grid springs can freely adjust the positioning grid within a certain range in the front-back direction and the left-right direction by the combined design of the bracket support, the guide rail and the sliding block of the positioning grid holding assembly, so that the internal springs of the positioning grid at different positions can be conveniently tested.
Drawings
FIG. 1 is a schematic perspective view of a special fixture for compression testing of spacer grid springs according to an embodiment of the present invention;
FIG. 2 is a front view of a special fixture for compression testing of spacer grid springs according to an embodiment of the present invention;
FIG. 3 is a left side view of a spacer grid spring compression test fixture according to an embodiment of the present invention;
FIG. 4 is a top view of a spacer grid spring compression test fixture according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the disassembly of a spring compression assembly in a special fixture for compression testing of spacer grid springs according to an embodiment of the present invention;
fig. 6 is a diagram of a bracket support structure in a special fixture for compression testing of spacer grid springs according to an embodiment of the present invention.
In the above figures: 1: a grid lower clamp; 2: a pin; 3: a first socket head cap screw; 4: cross groove screws; 5: a guide rail; 6: a bracket support; 601: a bottom plate; 602: a through hole; 603: a side plate; 604: a wing plate; 7: plum blossom groove round head screw; 8: a positioning grid; 9: a fixture is arranged on the grid; 901: rectangular matching holes; 10: a slide block; 11: a push rod; 12: and a second socket head cap screw.
Detailed Description
For a further understanding of the nature, features, and effects of the present invention, the following examples are set forth to illustrate, and are to be considered in connection with the accompanying drawings:
as shown in fig. 1 to 4, the present embodiment provides a special fixture for testing compression of a spacer grid spring, which mainly comprises two major parts of a spring compression assembly and a spacer grid holding assembly.
As shown in fig. 5, the spring compression assembly mainly includes two left and right lattice lower jigs 1, two left and right lattice upper jigs 9, and two left and right jack rods 11. The left grid lower clamp 1, the grid upper clamp 9 and the ejector rod 11 are connected with each other to form a rectangular frame, and the right grid lower clamp 1, the grid upper clamp 9 and the ejector rod 11 are connected with each other to form a rectangular frame. The rectangular frame body formed on the left side and the rectangular frame body formed on the right side are arranged on the same plane; in the rectangular frame body formed by two sides, two ejector rods 11 are relatively close, and two grid lower clamps 1 and two grid upper clamps 9 are relatively far away.
The left and right grid lower clamps 1 are identical in structure and symmetrically arranged, each grid lower clamp 1 is of a right-angle structure formed by an integrally formed vertical beam and a transverse beam, and the transverse beams are all positioned at the bottoms of the vertical beams. The top end of the vertical beam of the grid lower clamp 1 is provided with an outwards extending connector, the connector is provided with two bolt holes in the vertical direction and a pin hole in the vertical direction, and the two bolt holes are used for being fixed with a standard clamp on the left and right cross beams of the testing machine through a first inner hexagon screw 3; the pin holes are used for fixing with the grid upper clamp 9 through the pins 2. Square grooves are formed in the tail ends of the transverse beams of the grid lower clamp 1, threaded holes in the horizontal direction are formed in the square grooves, and the threaded holes are used for being connected with the lower ends of the ejector rods 11 through second socket head cap screws 12.
The left and right grid upper clamps 9 are identical in structure and symmetrically arranged, and each grid upper clamp 9 is of a right-angle structure formed by an integrally formed vertical beam and a transverse beam, wherein the transverse beams are all positioned at the top of the vertical beam. The bottom end of the vertical beam of the grid upper clamp 9 is provided with an outwards extending connector, the connector is provided with two bolt holes in the vertical direction and a pin hole in the vertical direction, and the two bolt holes are not used for connection, but are only used for facilitating the installation and the disassembly of the first inner hexagon screw 3; the pin holes are used for fixing with the grid lower fixture 1 through the pins 2. The transverse beam end of the grid upper clamp 9 is provided with a matching hole 901, and the matching hole 901 is used for enabling the upper end of the ejector rod 11 to be inserted and connected with the upper end of the ejector rod 11 through clearance fit.
The left ejector rod 11 and the right ejector rod 11 are identical in structure and are symmetrically arranged, and the lower end and the upper end of each ejector rod 11 are respectively connected with the grid lower clamp 1 and the grid upper clamp 9. The lower ends of the left and right ejector rods 11 are respectively clamped into the square grooves of the left and right lattice lower clamps 1, and the lower ends are provided with threaded holes in the horizontal direction, the threaded holes are aligned with the threaded holes in the square grooves of the lattice lower clamps 1, and second hexagon socket screws 12 are mounted, so that the left and right ejector rods 11 are respectively connected with the left and right lattice lower clamps 1. The upper ends of the left and right ejector rods 11 are respectively inserted into the matching holes 901 of the left and right grid upper clamps 9, and the upper ends of the ejector rods 11 are in clearance fit with the matching holes 901, so that the left and right ejector rods 11 are connected with the left and right grid upper clamps 9. The middle area of the ejector rod 11 simulates the uniform contact of the fuel rod and the spring inside the spacer grid 8 in the vertical direction.
After the left and right upper grid clamps 9 are respectively connected with the left and right lower grid clamps 1, the vertical beams of the left and right upper grid clamps are in butt joint through the connecting body, and the transverse beams are vertically corresponding and parallel to each other. The left ejector rod 11 and the right ejector rod 11 are respectively connected between the left grid upper clamp 9 and the right grid upper clamp 1 and the transverse beams of the left grid lower clamp 1 and are parallel to the vertical beams of the left grid upper clamp and the right grid lower clamp; i.e. the ejector rod 11 forms an I-shaped structure with the transverse beams of the upper grid clamp 9 and the lower grid clamp 1. Therefore, the standard clamps on the left and right cross beams of the testing machine are loaded through the two grid upper clamps 9 and the two grid lower clamps 1, so that the left grid upper clamps 9 and the grid lower clamps 1 apply force to the upper and lower ends of the left ejector rod 11, and the right grid upper clamps 9 and the grid lower clamps 1 apply force to the upper and lower ends of the right ejector rod 11 at the same time, thereby ensuring that the position of the positioning grid 8 is unchanged and the ejector rod 11 is in uniform contact with the springs in the positioning grid 8 in the vertical direction. Because the transverse beams of the upper grid clamp 9 and the transverse beams of the lower grid clamp 1 are perpendicular to the ejector rods 11, the influence of bending moment in the loading process can be avoided. The middle area of the ejector rod 11 can be designed into different shapes according to the structure of the springs in the spacer grid 8.
Therefore, the spring compression assembly is used for being connected with the standard clamp on the left and right cross beams of the testing machine, is arranged in the testing area between the cross beams of the testing machine, can realize symmetrical loading, ensures that the position of the positioning grid 8 is unchanged, and simultaneously ensures that no bending moment is influenced in the loading process.
The spacer grid holding assembly mainly comprises a bracket support 6, two guide rails 5 and two sliding blocks 10.
As shown in fig. 6, the bracket 6 is mainly composed of a bottom plate 601, left and right side plates 603, and front and rear wing plates 604. The bracket support 6 is positioned between the grid lower clamp 1 and the grid upper clamp 9, and the bottom edges of the side plates 603 are perpendicular to the transverse beams of the grid lower clamp 1 and the grid upper clamp 9.
The left side plate 603 and the right side plate 603 are arranged in parallel, and a positioning grid 8 is arranged between the two side plates 603; the spacer grids 8 are in clearance fit with the left and right side plates 603, so that the spacer grids 8 cannot deflect in the test process. A rectangular notch is cut in the middle of each side plate 603 to facilitate the installation of the lower grid clamp 1 and the upper grid clamp 9.
The bottom plate 601 is located at the bottom of the two side plates 603 and is disposed between the two side plates 603, and the bottom plate 601 is used for lifting the spacer grid 8 to bear the weight of the spacer grid 8. The bottom plate 601 is spaced from the transverse beams of the two lower lattice clamps 1, i.e., is not in contact with the two lower lattice clamps 1. A rectangular through hole 602 is formed in the middle of the bottom plate 601, and the through hole 602 is used for allowing the left and right ejector rods 11 to pass through.
The left side plate 603 and the right side plate 603 and the bottom plate 601 form a cuboid groove fixing area with no baffle plates at two ends, and are used for facilitating the placement of the positioning grid 8 by a manipulator. The spacer grids 8 can move between the two ends of the side plates 603, and the adjustment of the testing position of the spacer grids 8 in the front-rear direction is achieved.
The front and rear wing plates 604 are positioned on the top of the side plate 603 and are parallel to the bottom plate 601, and extend outwards from the front and rear ends of the side plate 603 respectively; the two side ends of each wing 604 are respectively connected with the ends of the two side plates 603. Each wing plate 604 is provided with two screw holes for connecting the sliding block 10 through the quincuncial groove round head screws 7, and the sliding block 10 is positioned at the bottom of the wing plate 604. The sliding block 10 is matched with the guide rail 5, and the sliding block 10 can slide along the guide rail 5 in a linear manner, so that the bracket support 6 is driven to move along the guide rail 5 in a linear manner. The guide rail 5 is fixed on the upper surface of the testing machine through a plurality of cross groove screws 4 which are arranged at intervals and are parallel to the length direction of the testing machine, so that the whole bracket 6 can slide along the length direction of the testing machine in a low friction manner, and the testing position of the positioning grid 8 in the left-right direction is moved.
The combined design of the bracket support 6, the guide rail 5 and the sliding block 10 ensures that the positioning grid 8 can move in a certain range in the front-back direction and the left-right direction, thereby facilitating the testing of springs at different positions inside the positioning grid 8. The installation and the position movement of the sample are completed by a manipulator during the test of the springs in the positioning grids 8; the sample installation comprises the placement of a positioning grid 8, and the connection of a grid upper clamp 9 and a grid lower clamp 1; the movement of the sample includes the front-rear position adjustment and the left-right position adjustment of the spacer grid 8.
It can be seen that the spacer grid holding assembly is used to assist the manipulator in placing the sample of the spacer grid 8, bearing the weight of the spacer grid 8, while ensuring that the spacer grid 8 does not deflect during the test; and is used to adjust the front, rear, left and right positions of the spacer grids 8.
The special fixture for compression test of the spacer grid spring has the following use process:
(1) The bottom ends of the left and right ejector rods 11 are respectively fixed at square grooves of the left and right grid lower clamps 1 through second hexagon socket screws 12.
(2) The left and right grid lower clamps 1 are fixed with standard clamps on the left and right cross beams of the testing machine through first inner hexagon screws 3, and the testing machine is operated to enable the left and right ejector rods 11 to be close to and attached to each other.
(3) Two wing plates 604 of the bracket support 6 are respectively connected with a slide block 10 through quincuncial groove round head screws 7, the slide block 10 is arranged on the guide rail 5, the guide rail 5 is fixed on the upper surface of the testing machine through cross groove screws 4, the guide rail 5 is parallel to the length direction of the testing machine, and the clamp main body is installed.
(4) The manipulator is used for picking up the positioning grid 8, the positioning grid 8 is placed between the two side plates 603 of the support frame 6, the left ejector rod 11 and the right ejector rod 11 are inserted into square holes to be positioned of the positioning grid 8, and the positioning grid 8 stops after contacting with the bottom plate 601 of the support frame 6.
(5) The left and right upper grid clamps 9 are picked up by using a manipulator and are respectively vertically spliced with the left and right ejector rods 11 through the matching holes 901, and meanwhile, the left and right upper grid clamps 9 are respectively fixed with the left and right lower grid clamps 1 through the pins 2, so that the placement of the sample is completed.
(6) And (3) debugging the mechanical loading condition in the testing machine, and performing a mechanical test.
(7) After the test is completed, the tester is operated so that the left and right ejector rods 11 are close to each other to be attached, and then the left and right grid upper clamps 9 are picked up by using a manipulator.
(8) The mechanical arm is used for moving the front and back positions of the positioning grids 8 in the support frame 6, then the left and right positions of the support frame 6 along the guide rail 5 are moved, so that the test positions of springs in the positioning grids 8 are changed, and the compression test of springs in the next position in the positioning grids 8 is completed by repeating the steps.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative, not restrictive, and many changes may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are to be construed as falling within the scope of the present invention.
Claims (4)
1. The special fixture for the compression test of the positioning grid spring is characterized by comprising a spring compression assembly and a positioning grid holding assembly;
the spring compression assembly comprises a left grid lower clamp, a right grid upper clamp and a left ejector rod; the left grid lower clamp, the grid upper clamp and the ejector rod are connected with each other to form a rectangular frame body, and the right grid lower clamp, the grid upper clamp and the ejector rod are connected with each other to form a rectangular frame body; rectangular frame bodies formed on two sides are arranged on the same plane, two ejector rods are relatively close, and two grid lower clamps and two grid upper clamps are relatively far away;
the two grid lower clamps are identical in structure and are symmetrically arranged, and each grid lower clamp is of a right-angle structure; the tops of the two grid lower clamps are respectively fixed on standard clamps on the left and right cross beams of the testing machine through first screws; the two upper grid clamps are identical in structure and are symmetrically arranged, and each upper grid clamp is of a right-angle structure; the bottoms of the two grid upper clamps are respectively connected with the tops of the two grid lower clamps through pins; the lower ends of the two ejector rods are respectively and fixedly connected to the bottoms of the two grid lower clamps through second screws, and the upper ends of the two ejector rods are respectively inserted into the matching holes at the tops of the two grid upper clamps; in the loading process, standard clamps on left and right cross beams of the testing machine apply force to the upper and lower ends of the ejector rod through the upper grid clamp and the lower grid clamp, and the middle area of the ejector rod is used for being inserted into a positioning grid to uniformly contact with springs in the positioning grid;
the positioning grid holding assembly comprises a bracket support, a front guide rail, a rear guide rail and a front sliding block and a rear sliding block; the bracket support is positioned between the grid lower clamp and the grid upper clamp;
the bracket support comprises a left side plate and a right side plate which are parallel to each other, the bottoms of the two side plates are connected with a bottom plate, and the front and the rear of the two side plates are respectively connected with two wing plates; a positioning grid is arranged between the two side plates, the positioning grid is in clearance fit with the side plates, and the bottom of the positioning grid is supported on the bottom plate; a space exists between the bottom plate and the grid lower clamp, and the ejector rod passes through a through hole formed in the bottom plate;
the two wing plates extend out from the front and rear sides of the side plates respectively, each wing plate is connected with a sliding block, the sliding blocks are arranged on the front and rear guide rails, the guide rails are fixed on the testing machine, and the sliding blocks can drive the support to slide along the guide rails in a straight line;
the positioning grid can move back and forth in the support, and the support can drive the positioning grid to move left and right, so that the position of the ejector rod in the positioning grid is adjusted to test internal springs at different positions in the positioning grid.
2. The special fixture for compression test of the positioning grid spring according to claim 1, wherein the grid lower fixture is a right-angle structure formed by integrally formed vertical beams and transverse beams, and the transverse beams are all positioned at the bottoms of the vertical beams; the top end of the vertical beam of the grid lower clamp is provided with an outwards extending connector, the connector is provided with a bolt hole in the vertical direction and a pin hole, the bolt hole is used for installing the first screw, and the pin hole is used for installing the pin; the transverse beam tail end of the grid lower clamp is provided with a square groove, a threaded hole in the horizontal direction is formed in the square groove, and the threaded hole is used for installing the second screw.
3. The special fixture for compression test of the positioning grid spring according to claim 1, wherein the upper fixture of the grid is a right-angle structure formed by integrally formed vertical beams and transverse beams, and the transverse beams are all positioned at the tops of the vertical beams; the bottom end of the vertical beam of the grid upper clamp is provided with an outwards extending connector, the connector is provided with a bolt hole in the vertical direction and a pin hole, the bolt hole is used for assembling and disassembling the first screw, and the pin hole is used for installing the pin; and the tail end of the transverse beam of the grid upper clamp is provided with a matching hole for being inserted into the upper end of the ejector rod.
4. The special fixture for compression testing of spacer grid springs according to claim 1, wherein a rectangular notch is cut in the middle of the side plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210073304.5A CN114544118B (en) | 2022-01-21 | 2022-01-21 | Special fixture for compression test of positioning grid springs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210073304.5A CN114544118B (en) | 2022-01-21 | 2022-01-21 | Special fixture for compression test of positioning grid springs |
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| CN114544118A CN114544118A (en) | 2022-05-27 |
| CN114544118B true CN114544118B (en) | 2023-09-19 |
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