1. A mechanical bearing test bed comprises a base (11) and is characterized in that a rack (12) is arranged on the top surface of the base (11), a jacking test mechanism is arranged on the inner side of the rack (12), a sample mounting mechanism is arranged on the side wall of the rack (12), and a control cabinet (13) is arranged on the top of the rack (12);

the sample mounting mechanism comprises a lead screw (21), a locking knob (22), a first mounting block (24), a second mounting block (25), a bearing (23) and a locking block (27), a mounting hole is formed in the side wall of the rack (12), the first mounting block (24) is embedded and fixed in the mounting hole in a matching way, a bearing mounting groove is formed in the outer side wall of the first mounting block (24), the bearing (23) is embedded and arranged in the bearing mounting groove in a matching way, the outer ring of the bearing (23) is fixedly connected with the peripheral side wall of the bearing mounting groove, the outer side wall of the locking knob (22) is fixedly connected with the inner ring of the bearing (23), a threaded hole is formed in the center of the locking knob (22), the lead screw (21) is screwed with the threaded hole in a matching way, the second mounting block (25) is arranged on one side of the first mounting block (24) far away from the bearing (23), and one end of the lead screw (21) is fixedly connected, first mounting groove (26) have been seted up on the lateral wall of keeping away from first installation piece (24) in second installation piece (25), locking piece (27) set up on the lateral wall of the relative frame (12) of second installation piece (25), the cross-section of locking piece (27) is hopper-shaped, second mounting groove (31) have been seted up on locking piece (27) are close to the lateral wall of second installation piece (25), be provided with a plurality of spacing ribs (32) on the week lateral wall of locking piece (27), the lateral wall that second installation piece (25) were kept away from in locking piece (27) is provided with rotation axis (33), and the special-shaped hole with locking piece (27) adaptation block is seted up to the lateral wall of frame (12).

2. The mechanical load-bearing test bed of claim 1, wherein the jacking test mechanism comprises an anti-roll slider (46), a jacking device (44), a horizontal block (43), a pressure sensor (42) and a jacking head (41), the anti-roll slider (46) is arranged on a bottom plate of the rack (12), a sliding groove (47) matched with the anti-roll slider (46) for sliding is formed in a side wall of the bottom plate of the rack (12), a positioning bolt is screwed on the side wall of the anti-roll slider (46), a mounting end of the jacking device (44) is fixedly connected with a top surface of the anti-roll slider (46), the horizontal block (43) is fixedly connected with an output end of the jacking device (44), the pressure sensor (42) is arranged above the horizontal block (43), the pressure sensor (42) and the horizontal block (43) are fixedly mounted through a bolt, the jacking head (41) is arranged above the pressure sensor (42), and the bottom end of the top pressure head (41) is matched and screwed with the pressure bearing end of the pressure sensor (42).

3. The mechanical bearing test bed of claim 2, wherein a fine adjustment hand wheel (45) is arranged on one side of the anti-roll sliding block (46), and a rod body of the fine adjustment hand wheel (45) is matched and screwed with the side wall of the machine frame (12).

Background

Fracture mechanics is closely related to production practice because defects and cracks cannot be avoided in the production process of metal materials or other materials, and the cracks gradually expand from micro cracks to macro cracks to form low-stress brittle fractures in the use process. The traditional impact toughness and other plasticity indexes are empirical formulas and are data of a test piece under the complete condition without cracks, the technical data cannot reflect the toughness level faithfully, and particularly cannot reflect the capability of a material for resisting low-stress brittle fracture for a large-sized member or a high-strength material, so that the development of a material bearing performance test is a necessary technical means for material research and development and member production.

In the prior art, various bearing capacity test devices are provided, but the multi-test-point test device is complex and heavy in structure, high in early-stage installation and later-stage maintenance cost, incapable of performing multi-test-point test and low in test precision, and has no applicable test device for testing the bearing capacity of a component with low precision requirement, so that the invention provides a mechanical bearing test bed.

Disclosure of Invention

The invention aims to provide a mechanical bearing test bed, which solves the problems that in the prior art, the bearing capacity of a component with low precision requirement is tested, and no applicable test device is available.

The purpose of the invention can be realized by the following technical scheme:

a mechanical bearing test bed comprises a base, wherein a rack is arranged on the top surface of the base, a jacking test mechanism is arranged on the inner side of the rack, a sample mounting mechanism is arranged on the side wall of the rack, and a control cabinet is arranged on the top of the rack;

the sample mounting mechanism comprises a screw rod, a locking knob, a first mounting block, a second mounting block, a bearing and a locking block, a mounting hole is formed in the side wall of the rack, the first mounting block is embedded and fixed in the mounting hole in a matching manner, a bearing mounting groove is formed in the outer side wall of the first mounting block, the bearing is embedded and arranged in the bearing mounting groove in a matching manner, the outer ring of the bearing is fixedly connected with the peripheral side wall of the bearing mounting groove, the outer side wall of the locking knob is fixedly connected with the inner ring of the bearing, a threaded hole is formed in the center of the locking knob, the screw rod is screwed with the threaded hole in a matching manner, the second mounting block is arranged on one side, away from the bearing, of the first mounting block, one end of the screw rod is fixedly connected with the side wall of the second mounting block, the side wall, away from the first mounting block, of the second mounting block is provided with the first mounting groove, and the locking block is arranged on the side wall of the rack opposite to the second mounting block, the cross-section of locking piece is hopper-shaped, has seted up the second mounting groove on the locking piece is close to the lateral wall of second installation piece, is provided with a plurality of spacing ribs on the week lateral wall of locking piece, and the lateral wall that the second installation piece was kept away from to the locking piece is provided with the rotation axis, and the special-shaped hole with locking piece adaptation block is seted up to the lateral wall of frame.

Further, jacking accredited testing organization is including preventing heeling slider, jacking ware, horizontal piece, pressure sensor and top pressure head, prevent heeling slider and set up on the bottom plate of frame, and set up on the lateral wall of bottom plate with prevent heeling slider adaptation slidable mounting's spout, it has positioning bolt to close soon on the lateral wall of preventing heeling slider, the installation end of jacking ware and the top surface fixed connection of preventing heeling slider, the output fixed connection of horizontal piece and jacking ware, pressure sensor sets up in the top of horizontal piece, and pressure sensor passes through bolt fixed mounting with the horizontal piece, the top pressure head sets up in pressure sensor's top, and the bottom of top pressure head closes soon with pressure sensor's pressure-bearing end adaptation.

Further, the jacking device is one of an oil cylinder and a hydraulic jack.

Furthermore, one side of the anti-roll sliding block is provided with a fine adjustment hand wheel, and a rod body of the fine adjustment hand wheel is matched with the side wall of the rack in a screwing mode.

The invention has the beneficial effects that:

1. the mechanical bearing test bed provided by the invention is provided with the sample installation mechanism, two ends of a sample are respectively clamped between the first installation groove and the second installation groove, the locking knob is rotated, the screw rod is screwed with the locking knob, the screw rod is pushed to move towards one end of the locking block, the second installation block is further pushed to move towards the locking block, the sample is clamped, the locking block is pressed in the special-shaped hole of the rack, the sample is prevented from rotating under the clamping action of the limiting rib, the sample installation is finished, the sample installation operation is simple, and the sample is firmly fixed.

2. The invention provides a mechanical bearing test bed which is provided with a sample mounting mechanism, a locking knob is rotated, a screw rod is screwed out to one side far away from a locking block, the rotating shaft is ejected out to one side of a second mounting block, a limiting rib is disengaged from a special-shaped hole of a rack, a sample is rotated to a required angle, the locking knob is screwed again to clamp the sample, and the angle adjustment of the sample is completed.

Drawings

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

FIG. 1 is a schematic structural diagram of a mechanical load-bearing test bed according to the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1 at A;

fig. 3 is a schematic structural diagram of the locking block.

In the drawings, the components represented by the respective reference numerals are listed below:

11. a base; 12. a frame; 13. a control cabinet; 21. a lead screw; 22. a locking knob; 23. a bearing; 24. a first mounting block; 25. a second mounting block; 26. a first mounting groove; 27. a locking block; 31. a second mounting groove; 32. limiting ribs; 33. a rotating shaft; 41. a pressing head is pressed; 42. a pressure sensor; 43. a horizontal block; 44. a jacking device; 45. finely adjusting a hand wheel; 46. a roll-off prevention slide block; 47. a chute.

Detailed Description

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

In the examples:

the switching power supply adopts a switching power supply LRS-60-24;

the controller adopts a controller T903;

the pressure sensor is a spoke sensor T312.

Referring to fig. 1-3, a mechanical bearing test bed comprises a base 11, a frame 12 is arranged on the top surface of the base 11, the frame 12 is a rectangular frame structure formed by welding stainless steel square pipes, the bottom of the frame 12 and the top surface of the base 11 are welded and fixed, a jacking test mechanism is arranged on the inner side of the frame 12, a sample mounting mechanism is arranged on the side wall of the frame 12, a control cabinet 13 is arranged on the top of the frame 12, and the control cabinet 13 comprises an electric cabinet, a switching power supply, a controller, a knob switch and a power indicator;

the sample mounting mechanism comprises a screw rod 21, a locking knob 22, a first mounting block 24, a second mounting block 25, a bearing 23 and a locking block 27, a mounting hole is formed in the side wall of the rack 12, the first mounting block 24 is embedded and fixed in the mounting hole in a matching manner, a bearing mounting groove is formed in the outer side wall of the first mounting block 24, the bearing 23 is embedded and arranged in the bearing mounting groove in a matching manner, the outer ring of the bearing 23 is fixedly connected with the peripheral side wall of the bearing mounting groove, the outer side wall of the locking knob 22 is fixedly connected with the inner ring of the bearing 23, a threaded hole is formed in the center of the locking knob 22, the screw rod 21 is screwed in matching manner with the threaded hole in a matching manner, the second mounting block 25 is arranged on one side of the first mounting block 24, which is far away from the bearing 23, one end of the screw rod 21 is fixedly connected with the side wall of the second mounting block 25, and the second mounting block 25 is far away from the side wall of the first mounting block 24 and is provided with a first mounting groove 26, the locking block 27 is arranged on the side wall of the rack 12 opposite to the second mounting block 25, the cross section of the locking block 27 is funnel-shaped, a second mounting groove 31 is formed in the side wall, close to the second mounting block 25, of the locking block 27, a plurality of limiting ribs 32 are arranged on the peripheral side wall of the locking block 27, a rotating shaft 33 is arranged on the side wall, far away from the second mounting block 25, of the locking block 27, and a special-shaped hole matched and clamped with the locking block 27 is formed in the side wall of the rack 12; when a sample is installed, two ends of the sample are respectively clamped between the first installation groove 26 and the second installation groove 31, the locking knob 22 is rotated, the screw rod 21 is screwed with the locking knob 22, the screw rod 21 is pushed to move towards one end of the locking block 27, the second installation block 25 is further pushed to move towards the locking block 27, the sample is clamped, meanwhile, the locking block 27 is abutted in the special-shaped hole of the rack 12, and the sample is prevented from rotating under the clamping action of the limiting rib 32; when switching the examination point, loosen locking knob 22, it is ejecting to second installation piece 25 one side with rotation axis 33, spacing rib 32 breaks away from the block, and rotatory sample is to needs the angle, closes locking knob 22 once more soon, presss from both sides the sample tightly, can accomplish the adjustment of each angle examination point, and than current load test device, this sample installation mechanism realizes the quick installation to the sample, multi-angle examination point fast switch-over.

The jacking test mechanism comprises an anti-roll sliding block 46, a jacking device 44, a horizontal block 43, a pressure sensor 42 and a jacking head 41, wherein the anti-roll sliding block 46 is arranged on a bottom plate of the frame 12, a sliding groove 47 matched with the anti-roll sliding block 46 in a sliding manner is formed in the side wall of the bottom plate, the anti-roll sliding block 46 and the sliding groove 47 are processed by a high-precision numerical control milling machine, the assembly gap is not more than 0.1mm, the shaking of the jacking device 44 in the test process is reduced, the test precision is ensured, a positioning bolt is screwed on the side wall of the anti-roll sliding block 46, the position of the anti-roll sliding block 46 is fixed through the positioning bolt, the mounting end of the jacking device 44 is fixedly connected with the top surface of the anti-roll sliding block 46, in the embodiment, an oil cylinder is used as the jacking device 44, the oil cylinder is communicated with an external hydraulic station, the jacking pressure is slowly increased through a control assembly, the test data are more accurate, the horizontal block 43 is fixedly connected with the output end of the jacking device 44, the pressure sensor 42 is arranged above the horizontal block 43, the pressure sensor 42 and the horizontal block 43 are fixedly installed through bolts, the pressure sensor 42 is in a horizontal state during testing through the arrangement of the horizontal block 43, the stress point of a sample is perpendicular to the direction of the jacking force, the data accuracy is guaranteed, after long-term use, when the horizontal block 43 deforms and does not meet the requirement of the horizontal state, the horizontal block 43 can be replaced without replacing the jacking device 44, the later-period maintenance and repair of the pressure-bearing type pressure-testing device 42.

A fine adjustment hand wheel 45 is arranged on one side of the anti-roll sliding block 46, a rod body of the fine adjustment hand wheel 45 is matched with the side wall of the rack 12 in a screwing mode, after the position of the coarse adjustment test point is adjusted, the test point is positioned in a screwing feeding mode through the fine adjustment hand wheel 45, so that the positioning point is more accurate, and obviously, a graduated scale can also be arranged on the side wall of the bottom plate of the rack 12 and used for positioning adjustment.

The working principle of the invention is as follows:

and (3) sample installation: clamping two ends of a sample between a first mounting groove 26 and a second mounting groove 31 respectively, rotating a locking knob 22, screwing a lead screw 21 and the locking knob 22, pushing the lead screw 21 to move towards one end of a locking block 27, further pushing a second mounting block 25 to move towards the locking block 27, clamping the sample, meanwhile, abutting the locking block 27 in a special-shaped hole of the rack 12, preventing the sample from rotating under the clamping action of a limiting rib 32, and completing sample mounting;

adjusting a test point: rotating the locking knob 22, screwing out the screw rod 21 to one side far away from the locking block 27, then ejecting the rotating shaft 33 to one side of the second mounting block 25, disengaging the limiting rib 32 from the special-shaped hole of the rack 12, rotating the sample to a required angle, screwing the locking knob 22 again, clamping the sample, completing the angle adjustment of the sample, loosening the positioning bolt, sliding the anti-roll sliding block 46 to a rough test point position, rotating the fine adjustment hand wheel 45, adjusting the position of the anti-roll sliding block 46, adjusting the top pressure head 41 to a test point position, and locking the positioning bolt, thus completing the test point adjustment of the sample;

carrying and testing: the hydraulic station pumps hydraulic oil into the jacking device 44 to jack the jacking head 41 upwards, the pressure sensor 42 tests the bearing capacity and inputs the bearing capacity into the control cabinet 13, the test is completed, the hydraulic reversing valve of the hydraulic station reverses to release the pressure, the jacking device 44 resets, and the bearing test is completed.

The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.