Low-temperature fatigue testing machine

Abstract

The utility model belongs to the technical field of fatigue testing machines, and provides a low-temperature fatigue testing machine which comprises a variable-frequency oil source, a low-temperature box and a cross beam mounting frame, the low-temperature box comprises a box body and a supporting frame, and the supporting frame is welded to the bottom of the box body. The front end of the box body is inserted into the middle part of the cross beam mounting frame; the cross beam mounting frame comprises an upper cross beam and a lower cross beam, and a stand column is arranged between the upper cross beam and the lower cross beam; the four stand columns are distributed at the four corners of the cross beam mounting frame. According to the scheme, modular butt joint is adopted, and the front end of the box body is in butt joint with the middle of the cross beam mounting frame, so that the mounting hole corresponds to the connecting rod and the hydraulic clamp; the cross beam mounting frame is also mounted in a modularized manner, the relative height between the upper cross beam and the lower cross beam is adjusted through a lifting oil cylinder, and the dismounting and the mounting are also very convenient; a gap base plate is arranged in a positioning hole of the centering base, so that the stress after bearing is relieved, and the influence of gap shaking on the test piece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fatigue testing machines, in particular to a low-temperature fatigue testing machine. Background Art

[0002] Low temperature fatigue testing machine is a test that uses metal specimens or simulated parts to undergo alternating load cycles in various low temperature environments to determine their fatigue performance criteria, and to study their fracture process, and evaluate the fatigue strength and fatigue life of materials, parts or complete machines. Low temperature fatigue testing machine can study the fatigue mechanical behavior of small specimens, metal materials and other structural simulation parts in low temperature environments; analyze the causes of high and low cycle fatigue fractures, study the mechanism of material influence on high and low cycle fatigue failure, reveal the high and low cycle fatigue damage mechanism of materials; high and low cycle fatigue life models, etc.

[0003] However, the existing fatigue testing machines are not modular enough, and installation and docking are very troublesome. In addition, there is gap friction at the load-bearing position of the fatigue testing machine, which reduces the service life of the load-bearing parts. For this reason, we propose a low-temperature fatigue testing machine. Utility Model Content

[0004] The purpose of the utility model is to provide a low temperature fatigue testing machine to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-temperature fatigue testing machine, including a variable frequency oil source, a low-temperature box and a beam mounting frame;

[0006] The low temperature box includes a box body and a support frame, the bottom of the box body is welded with a support frame; the front end of the box body is plugged into the middle of the beam mounting frame; the beam mounting frame includes an upper beam and a lower beam, and a column is arranged between the upper beam and the lower beam;

[0007] There are four columns, which are distributed at the four corners of the beam mounting frame; an oil cylinder is fixed in the middle of the upper beam, a servo valve is arranged on the front side of the oil cylinder, and the bottom of the oil cylinder extends downward and passes through the upper beam;

[0008] A load sensor is provided at the lower part of the oil cylinder, and a connecting rod is connected to the bottom of the oil cylinder, and the connecting rod extends downward to the top of the lower cross beam;

[0009] A centering base is provided in the middle of the top of the lower cross beam, a hydraulic clamp is provided on the top of the centering base, and the hydraulic clamp is butted with the bottom of the connecting rod;

[0010] A positioning hole is opened in the middle of the lower cross beam, a positioning bolt is arranged at the bottom of the centering base, and the positioning bolt is inserted downward into the positioning hole, and a locking bolt is inserted upward at the bottom of the positioning hole.

[0011] Preferably, support rods are welded to the four corners of the bottom of the support frame, and movable wheels are provided at the bottom of the support rods. One third of the box body extends forward, and the extended part does not contact the support frame; the movable wheels are self-locking universal load-bearing wheels.

[0012] Preferably, top beams are provided on the tops of the four columns, and the top beams are distributed in a circular shape and are fixedly connected to the tops of the columns by bolts.

[0013] Preferably, lifting cylinders are symmetrically arranged on the left and right sides of the top of the lower cross beam, and the tops of the lifting cylinders are connected to the left and right sides of the upper cross beam.

[0014] Preferably, protective covers are symmetrically arranged on the top of the lower cross beam, and the protective covers respectively surround the inner sides of the left and right side columns and the lifting cylinder.

[0015] Preferably, a positioning screw hole is opened in the middle of the positioning bolt, and the locking bolt is screwed in the positioning screw hole; a limiting plate is arranged at the lower part of the inner cavity of the positioning hole, and the locking bolt abuts against the limiting plate; a gap pad is arranged at the top of the inner cavity of the positioning hole, and the gap pad is clamped on the outside of the positioning bolt.

[0016] Preferably, the front side of the box body is provided with vertically symmetrical mounting holes, and the two mounting holes correspond to the connecting rod and the hydraulic clamp respectively.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. This scheme adopts modular docking. The low-temperature box is installed on the top of the support frame and pushed forward by the moving wheels. The moving wheels are self-locking universal load-bearing wheels. The box can be flexibly moved by the moving wheels. The front end of the box is docked in the middle of the beam mounting frame, so that the mounting holes correspond to the connecting rod and the hydraulic clamp; at the same time, the beam mounting frame also adopts modular installation. The relative height between the upper beam and the lower beam is adjusted by the lifting cylinder, and disassembly and installation are also very convenient;

[0019] 2. A centering base is provided on the lower cross beam, and a gap pad is provided in the positioning hole of the centering base to relieve the stress after bearing and reduce the influence of the gap shaking on the test piece, so as to ensure that the load-bearing part of the centering base and the entire mechanical assembly have stable performance and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the front view of the utility model;

[0021] Figure 2 This is a schematic diagram of the beam mounting frame of the utility model;

[0022] Figure 3This is a bottom view of the beam mounting frame of the utility model;

[0023] Figure 4 This is a schematic diagram of the low temperature box of the utility model

[0024] Figure 5 This is a cross-sectional view of the positioning hole of the utility model.

[0025] In the figure: 1 frequency conversion oil source; 2 low temperature box; 3 beam mounting frame;

[0026] 201 box body; 202 working chamber; 203 support frame; 204 moving wheel;

[0027] 301 upper crossbeam; 302 column; 303 top beam; 304 oil cylinder; 305 servo valve; 306 load sensor; 307 connecting rod; 308 lower crossbeam; 309 protective cover; 310 lifting cylinder; 311 hydraulic clamp; 312 centering base; 313 positioning hole; 314 locking bolt; 315 positioning screw hole; 316 gap pad. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Example:

[0031] See also Figure 1-5 , the utility model provides a technical solution of a low temperature fatigue testing machine: comprising a variable frequency oil source 1, a low temperature box 2 and a beam mounting frame 3;

[0032] The low temperature box 2 includes a box body 201 and a support frame 203. The support frame 203 is welded to the bottom of the box body 201. Support rods are welded to the four corners of the bottom of the support frame 203. The bottom of the support rods is provided with moving wheels 204. One third of the box body 201 extends forward, and the extended part does not contact the support frame 203.

[0033] The moving wheel 204 is a self-locking universal load-bearing wheel;

[0034] The front end of the box 201 is plugged into the middle of the beam mounting frame 3; the beam mounting frame 3 includes an upper beam 301 and a lower beam 308, and a column 302 is arranged between the upper beam 301 and the lower beam 308. There are four columns 302, which are distributed at the four corners of the beam mounting frame 3;

[0035] A cylinder 304 is fixed in the middle of the upper cross beam 301 , a servo valve 305 is arranged on the front side of the cylinder 304 , and the bottom of the cylinder 304 extends downward and passes through the upper cross beam 301 ;

[0036] A top beam 303 is provided on the top of the four columns 302, and the top beam 303 is distributed in a circular shape and is fixedly connected to the top of the column 302 by bolts;

[0037] A load sensor 306 is provided at the lower part of the oil cylinder 304, and a connecting rod 307 is connected to the bottom of the oil cylinder 304, and the connecting rod 307 extends downward to the top of the lower cross beam 308;

[0038] A centering base 312 is provided in the middle of the top of the lower cross beam 308, a hydraulic clamp 311 is provided on the top of the centering base 312, and the hydraulic clamp 311 is butted with the bottom of the connecting rod 307;

[0039] Lifting cylinders 310 are symmetrically arranged on the left and right sides of the top of the lower crossbeam 308, and the tops of the lifting cylinders 310 are connected to the left and right sides of the upper crossbeam 301;

[0040] A protective cover 309 is symmetrically arranged on the top of the lower cross beam 308, and the protective cover 309 surrounds the inner sides of the left and right side columns 302 and the lifting cylinder 310 respectively;

[0041] A positioning hole 313 is provided in the middle of the lower cross beam 308, a positioning bolt is provided at the bottom of the centering base 312, and the positioning bolt is inserted downward into the positioning hole 313, a locking bolt 314 is inserted upward into the bottom of the positioning hole 313, a positioning screw hole 315 is provided in the middle of the positioning bolt, and the locking bolt 314 is screwed into the positioning screw hole 315;

[0042] A limit plate is provided at the lower part of the inner cavity of the positioning hole 313, and the locking bolt 314 abuts against the limit plate;

[0043] A gap pad 316 is provided at the top of the inner cavity of the positioning hole 313, and the gap pad 316 is clamped on the outside of the positioning bolt;

[0044] The front side of the box body 201 is provided with vertically symmetrical mounting holes, and the two mounting holes correspond to the connecting rod 307 and the hydraulic clamp 311 respectively;

[0045] When testing the testing machine of this scheme, the test piece needs to be placed in the low temperature box 2, which is installed on the top of the support frame 203 and pushed forward by the moving wheels 304. The moving wheels 204 are self-locking universal load-bearing wheels. The box body 201 can be flexibly moved by the moving wheels 204, and the front end of the box body 201 is docked in the middle of the beam mounting frame 3, and the mounting hole is made to correspond to the connecting rod 307 and the hydraulic clamp 311;

[0046] A sealed door is provided at the front end of the box body 201, and the sealed door is closed after installation. The low temperature box 2 is a prior art, and a low temperature environment is achieved by forming a low temperature zone inside, so as to cooperate with the experiment;

[0047] The lifting cylinder 310 is used to adjust the up and down movement of the upper crossbeam 301, and the cylinder 304 is used to control the movement of the connecting rod 307, and together with the hydraulic clamp 311, the pressure on the test piece is completed; the hydraulic clamp 311 is an annular clamp, and its opening and closing stroke is controlled by hydraulic pressure. The annular hydraulic clamp is a prior art and will not be described in detail here;

[0048] A positioning hole 313 is provided on the lower cross beam 308, through which the centering base 312 can be quickly installed in the center. At the same time, the top of the centering base 312 is fixedly installed with the hydraulic clamp 311. The middle part of the hydraulic clamp 311 is opened and provided with bolts, which are screwed and fixed to the centering base 312.

[0049] The centering base 312 can be detachably installed in the positioning hole 313 and is screwed upward with a locking bolt 314 at the bottom. At the same time, a gap pad 316 is also provided in the positioning hole 313 to reduce the shaking amplitude of the centering base 312, relieve the stress after bearing weight, and reduce the influence of the gap shaking on the specimen, so as to ensure that the load-bearing part of the centering base and the entire mechanical assembly have stable performance and a long service life.

[0050] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0051] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature fatigue testing machine, comprising a variable frequency oil source (1), a low temperature box (2) and a beam mounting frame (3), characterized in that: The low-temperature box (2) comprises a box body (201) and a support frame (203), the support frame (203) being welded to the bottom of the box body (201); the front end of the box body (201) is plugged into the middle of a crossbeam mounting frame (3); the crossbeam mounting frame (3) comprises an upper crossbeam (301) and a lower crossbeam (308), a column (302) being arranged between the upper crossbeam (301) and the lower crossbeam (308); There are four upright columns (302) distributed at the four corners of the crossbeam mounting frame (3); a cylinder (304) is fixed in the middle of the upper crossbeam (301), a servo valve (305) is arranged at the front side of the cylinder (304), and the bottom of the cylinder (304) extends downward and passes through the upper crossbeam (301); A load sensor (306) is provided at the lower part of the oil cylinder (304), and a connecting rod (307) is connected to the bottom of the oil cylinder (304), and the connecting rod (307) extends downward to the top of the lower cross beam (308); A centering base (312) is provided in the middle of the top of the lower cross beam (308), a hydraulic clamp (311) is provided on the top of the centering base (312), and the hydraulic clamp (311) and the bottom of the connecting rod (307) are connected to each other; A positioning hole (313) is provided in the middle of the lower cross beam (308), a positioning bolt is provided at the bottom of the centering base (312), and the positioning bolt is inserted downward into the positioning hole (313), and a locking bolt (314) is inserted upward at the bottom of the positioning hole (313).

2. A low temperature fatigue testing machine according to claim 1, characterized in that: Support rods are welded at the four corners of the bottom of the support frame (203), and moving wheels (204) are arranged at the bottom of the support rods. One third of the box body (201) extends forward, and the extended part does not contact the support frame (203); the moving wheels (204) are self-locking universal load-bearing wheels.

3. A low temperature fatigue testing machine according to claim 1, characterized in that: A top beam (303) is arranged on the top of the four columns (302), and the top beam (303) is distributed in a circular shape and is fixedly connected to the top of the column (302) by bolts.

4. A low temperature fatigue testing machine according to claim 1, characterized in that: Lifting cylinders (310) are symmetrically arranged on the left and right sides of the top of the lower cross beam (308), and the tops of the lifting cylinders (310) are connected to the left and right sides of the upper cross beam (301).

5. A low temperature fatigue testing machine according to claim 1, characterized in that: A protective cover (309) is symmetrically arranged on the top of the lower cross beam (308), and the protective cover (309) surrounds the inner sides of the left and right side columns (302) and the lifting cylinder (310) respectively.

6. A low temperature fatigue testing machine according to claim 1, characterized in that: A positioning screw hole (315) is provided in the middle of the positioning bolt, and a locking bolt (314) is screwed into the positioning screw hole (315); a limiting plate is provided at the lower part of the inner cavity of the positioning hole (313), and the locking bolt (314) abuts against the limiting plate; a gap pad (316) is provided at the top of the inner cavity of the positioning hole (313), and the gap pad (316) is clamped on the outer side of the positioning bolt.

7. A low temperature fatigue testing machine according to claim 1, characterized in that: The front side of the box body (201) is provided with vertically symmetrical mounting holes, and the two mounting holes correspond to the connecting rod (307) and the hydraulic clamp (311) respectively.

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