CN219810782U - Microcomputer controlled electronic universal tester - Google Patents

Abstract

The utility model relates to a microcomputer control electronic universal tester, which relates to the technical field of universal testers and comprises a rack, a test plate, a clamping mechanism, a workbench and a cold header, wherein the test plate is arranged on the rack in a sliding manner; the fixing mechanism comprises a mounting block arranged on the cold header, a fixing block arranged on the cold header and a connecting assembly used for enabling the relative position of the mounting block and the fixing block to be constant, a sliding groove is formed in the fixing block, the mounting block is movably inserted into the sliding groove and is in sliding fit with the inner side wall of the sliding groove, and an opening of the sliding groove, which is close to the mounting block, is narrower than the width of the bottom wall in the sliding groove. The utility model has the effects of being beneficial to enabling the universal testing machine to be adaptive to tubular samples with different pipe diameters and simplifying the disassembly operation of technicians during the overhauling and replacing of the cold upsetting.

Description

Microcomputer controlled electronic universal tester

Technical Field

The utility model relates to the technical field of universal testing machines, in particular to a microcomputer-controlled electronic universal testing machine.

Background

The universal testing machine integrates functions of stretching, bending, compressing, shearing, ring stiffness and the like, is mainly used for mechanical property tests of metal and nonmetal materials, and is ideal detection equipment for departments such as industrial and mining enterprises, scientific research institutions, universities and colleges, engineering quality monitoring stations and the like.

The common universal testing machine comprises a vertically fixed frame, a test plate arranged on the frame in a sliding manner, clamping mechanisms arranged on the frame and a pressure mechanism, wherein two groups of clamping mechanisms are arranged, one group of clamping mechanisms are arranged on the frame on the top side, the other group of clamping mechanisms are arranged on the top side of the test plate, the pressure mechanism comprises a cold upsetting head arranged on the bottom side of the test plate and a workbench arranged on the bottom frame, and a power piece for lifting and driving the test plate is further arranged on the frame; when a tensile test is required, a technician puts a sample to be detected between two groups of clamping mechanisms, clamps and fixes the sample to be detected through the two groups of clamping mechanisms, and then controls the test board to descend through the power piece to detect the tensile strength of the sample; when the bending strength of the tubular sample is detected, a technician horizontally places the tubular sample on a workbench, and the tubular sample is compressed by the descending of the cold heading controlled by the power piece, so that the compressive strength of the tubular sample is detected.

For the related art in the foregoing, when detecting the tubular sample, the technician needs to horizontally place the tubular sample on the workbench and compress the tubular sample by the cold heading, because the cold heading of the equipment is smaller, when detecting the tubular sample with a larger pipe diameter, the technician needs to additionally install a large cold heading sheet, often adopts a welding or bolt locking mode to install the cold heading sheet additionally, after the welding and fixing, the abrasion or bending of the cold heading sheet is inconvenient to detach and replace, and the contact surface of the cold heading sheet and the tubular sample needs to be kept flat by the bolt locking mode, so in order to reduce the influence of the bolt on the flatness of the cold heading sheet, the cold heading sheet needs to be thicker, and resources are wasted.

Disclosure of Invention

In order to facilitate the universal testing machine to adapt to tubular samples with different pipe diameters, the utility model provides a microcomputer control electronic universal testing machine which simplifies the disassembly operation of technicians during the overhauling and replacing of cold upsetting sheets.

The microcomputer control electronic universal testing machine provided by the utility model adopts the following technical scheme:

the microcomputer control electronic universal testing machine comprises a rack, a test board, a clamping mechanism, a workbench and a cold header, wherein the test board is arranged on the rack in a sliding manner, the clamping mechanism is arranged on the rack, the cold header is provided with the cold header, and the cold header is also provided with a fixing mechanism for enabling the cold header to be stably connected with the cold header; the fixing mechanism comprises a mounting block arranged on the cold header, a fixing block arranged on the cold header and a connecting assembly used for enabling the relative position of the mounting block and the fixing block to be constant, a sliding groove is formed in the fixing block, the mounting block is movably inserted into the sliding groove and is in sliding fit with the inner side wall of the sliding groove, and an opening of the sliding groove, which is close to the mounting block, is narrower than the width of the bottom wall in the sliding groove.

By adopting the technical scheme, when the tubular sample is detected, a technician places the tubular sample on the workbench, and the cold heading head descends so that the cold heading plate compresses and detects the tubular sample, and meanwhile, when the tubular samples with different pipe diameters are detected and the cold heading plates with different sizes need to be replaced, the technician can quickly detach the cold heading plate by adjusting the connecting assembly and sliding the fixing block out of the sliding groove, so that the replacement is convenient; and when installing cold heading board, technical staff removes the fixed block and is close to the installation piece to slide into the inslot that slides with the installation piece, because the opening that the inslot that slides is close to the installation piece is narrower than the opening of the inslot diapire that slides, when cold heading head goes up and down, installation piece and fixed block are difficult for separating, thereby realize cold heading board to the stable compression of tubular sample, then make installation piece and fixed block keep the invariable of relative position through the coupling assembling who sets up, thereby realize the stable installation of cold heading board and cold heading head, technical staff is simple to the installation of cold heading board simultaneously, thereby promote the change efficiency of cold heading board.

Optionally, the slip groove is the opening form along seting up direction one end, and the other end is equipped with the baffle, the baffle with the lateral wall activity of installation piece supports tightly, coupling assembling is including locating bolt and the setting element that is used for carrying out the pre-fixation to installation piece and fixed block on the fixed block, locating bolt with the installation piece is kept away from the lateral wall activity of baffle supports tightly.

Through adopting above-mentioned technical scheme, when technical personnel installs the cold-heading board, at first technical personnel slide into the inslot that slides with the installation piece, until the lateral wall of installation piece laminating mutually with the baffle, make the installation piece be difficult for sliding in the inslot that slides through the pre-fixing piece this moment, thereby realize fixing in advance the installation piece, then through screw in locating bolt, make locating bolt and installation piece keep away from the lateral wall of baffle and offset tightly, thereby realize fixing the installation piece, the installation piece is difficult for sliding in the inslot this moment, thereby realize the stable installation of cold-heading board and cold heading head is fixed, and easy operation to the installation of cold-heading board.

Optionally, the first locating hole has been seted up on the installation piece, the second locating hole has been seted up on the fixed block, the setting element including elasticity set up in locating piece in the second locating hole, the locating piece activity protrusion in the second locating hole lays, just the locating piece activity runs through first locating hole.

Through adopting above-mentioned technical scheme, when the technician sliding mounting piece makes the installation piece slide in the inslot that slides, through pressing the locating piece, under the effect of elastic compression force, the locating piece is submerged into the second locating hole, when the sliding mounting piece makes first locating hole and second locating hole correspond, the locating piece pops out under the effect of elastic recovery force this moment, make the installation piece be difficult for taking place relative slip, realize pre-fixing to the position of installation piece and fixed block to the follow-up technician is convenient for further fixed operation to the installation piece.

Optionally, the positioning blocks are provided with a plurality of groups, the positioning blocks are distributed at intervals along the sliding direction of the fixed block, and the mounting block is further provided with a synchronizing piece for synchronously adjusting the positioning blocks.

Through adopting above-mentioned technical scheme, the multiunit locating piece that sets up is fixed in advance to the position of installation piece and fixed block to keep stable when making installation piece and fixed block pre-fix, be difficult for leading to the problem that can't prepositioning because of a locating piece wearing and tearing, carry out synchronous regulation to a plurality of locating pieces through the synchronizing piece that sets up simultaneously, further simplify technician's regulation operation.

Optionally, the mounting block is provided with a synchronizing groove, the synchronizing groove is consistent with the sliding direction of the fixing block, the synchronizing groove is communicated with the second positioning holes, and the synchronizing piece comprises a connecting rod, and the connecting rod is fixedly connected with the connecting rods.

Through adopting above-mentioned technical scheme, when technical staff presses a locating piece, the locating piece drives the connecting rod and moves down in the synchronization groove to make a plurality of locating pieces slide to the second locating hole simultaneously, realize the simultaneous adjustment of a plurality of locating pieces, thereby simplify the adjustment operation of technical staff to a plurality of locating pieces.

Optionally, be equipped with the limiting plate on the workstation and support tight board, the limiting plate with support tight board and lay relatively, the tubular sample activity place in the limiting plate with support between the tight board, just the limiting plate with support tight board one side that is close to each other with the both ends activity of tubular sample support tightly.

Through adopting above-mentioned technical scheme, when technical personnel need examine tubular sample, technical personnel place tubular sample on the workstation, make limiting plate and support tight board support tight tubular sample, make tubular sample be located the cold heading board under all the time to the error that the roll of tubular sample brought when reducing compression test.

Optionally, the tight board of support slides and sets up in on the workstation, just still be equipped with on the workstation and be used for driving the tight board of support elasticity reciprocal elastic component.

Through adopting above-mentioned technical scheme, when placing tubular sample on the workstation, the technician is through stirring tight board, makes the interval grow between tight board and the limiting plate that supports to make the placing of tubular sample comparatively simple, simultaneously through the elastic component that sets up, when carrying out compression detection to the tubular sample of different diameters, the length standard of the tubular sample of different diameters also is inconsistent, consequently can both realize stable spacing and stable centre gripping to the tubular sample of different length through the elastic component that sets up.

Optionally, the limiting plate and the side wall close to each other of the abutting plate are respectively provided with a clamping plate, and the clamping plates are attached to the inner side wall of the tubular sample.

Through adopting above-mentioned technical scheme, when limiting plate and butt board carry out the centre gripping to tubular sample, the joint board of setting stretches into the inside of tubular sample and offsets tightly with the inner wall of tubular sample to make the difficult emergence of filling sample rotate, make the difficult emergence of tubular sample roll, thereby realize stable compression test.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. through the installation block arranged on the cold header, the fixed block arranged on the cold header and the connecting component, when the cold header needs to be disassembled and replaced, a technician can realize the rapid installation and disassembly of the cold header and the cold header by adjusting the connecting component and sliding the fixed block to enable the installation block to slide and separate from the sliding groove;

2. through the baffle and the positioning bolt, when a technician installs the cold-heading plate, the technician slides the installation block in the chute on the fixed block until the installation block is abutted against the baffle, and then screws in the positioning bolt to make the positioning bolt abutted against the side wall of the installation block, so that the relative position of the installation block and the fixed block is constant, and the stable installation of the cold-heading plate is realized;

3. the tubular sample is clamped and limited by the set abutting plate and the limiting plate, so that the tubular sample is stably positioned under the cold heading plate when the tubular sample is tested, and the stable compression test of the tubular sample is realized.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a microcomputer controlled electronic universal testing machine in an embodiment of the utility model;

FIG. 2 is a schematic diagram of the connection structure of the fixed block and the mounting block;

fig. 3 is a schematic view of a connection structure of the workbench, the abutting plate and the limiting plate.

Reference numerals: 1. a frame; 11. a clamping mechanism; 12. a work table; 13. a cold heading; 2. a cold heading plate; 21. a fixed block; 22. a mounting block; 23. a slip groove; 3. a connection assembly; 31. positioning bolts; 32. a baffle; 33. a positioning piece; 331. a first positioning hole; 332. a second positioning hole; 333. a positioning block; 334. a positioning spring; 34. a synchronizing member; 341. a connecting rod; 342. a synchronization groove; 4. a limiting plate; 41. a pressing plate; 42. an adjustment tank; 43. a limit rod; 44. an adjusting spring; 45. and a clamping plate.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-3.

The embodiment of the utility model discloses a microcomputer control electronic universal testing machine. Referring to fig. 1, a microcomputer control electronic universal tester comprises a stand 1 vertically arranged on the ground, a test board arranged on the stand 1 in a lifting and sliding manner, two groups of clamping mechanisms 11, a workbench 12 and a cold heading head 13, wherein the clamping mechanisms 11 are arranged on the stand 1 at the top side, one group of clamping mechanisms 11 is arranged on the stand 1 at the top side, the other group of clamping mechanisms 11 is arranged at the top side of the test board, and the cold heading head 13, the clamping mechanisms 11 and the workbench 12 are arranged on the same vertical line; and the cold header 13 is detachably provided with the cold header plate 2, and the cold header 13 is provided with a fixing mechanism for keeping the cold header 13 and the cold header plate 2 stably connected.

Referring to fig. 1 and 2, the fixing mechanism comprises a mounting block 22 fixed on the cold header 13, a fixing block 21 fixed on the cold header 2 and a connecting assembly 3 for keeping the relative position between the mounting block 22 and the fixing block 21 constant, wherein a sliding groove 23 is formed in the upper surface of the fixing block 21, the sliding groove 23 is distributed along the height direction perpendicular to the frame 1, the mounting block 22 is slidably matched with the sliding groove 23, the sliding direction of the mounting block 22 is consistent with the opening direction of the sliding groove 23, the bottom wall of the mounting block 22 is movably attached to the inner bottom wall of the sliding groove 23, the opening at the top end of the sliding groove 23 is narrower than the width of the inner bottom wall of the sliding groove 23, and the top side of the mounting block 22 is movably attached to the inner side wall of the sliding groove 23 close to the opening.

When detecting tubular samples, a technician places the tubular samples on the workbench 12, and the cold heading heads 13 descend to enable the cold heading plates 2 to carry out compression detection on the tubular samples, and meanwhile, when detecting the tubular samples with different pipe diameters and needing to replace the cold heading plates 2 with different sizes, the technician can realize quick disassembly of the cold heading plates 2 by adjusting the connecting assembly 3 and sliding the fixing blocks 21 and the mounting blocks 22 out of the sliding grooves 23 so as to be convenient for replacement; when the cold header plate 2 is installed, a technician moves the fixed block 21 to be close to the installation block 22 and slides the installation block 22 into the sliding groove 23, and the installation block 22 is not easily separated from the fixed block 21 when the cold header 13 is lifted because the opening of the sliding groove 23, which is close to the installation block 22, is narrower than the opening of the bottom wall in the sliding groove 23, so that the stable compression of the cold header plate 2 to the tubular sample is realized.

Referring to fig. 2, both ends of the sliding groove 23 along the arrangement direction of the sliding groove are open, one end of the sliding groove 23, which is open, is fixedly connected with a baffle plate 32, the baffle plate 32 fixedly seals one open end, the side wall of the mounting block 22 is attached to the side wall of the baffle plate 32, the connecting component 3 comprises a positioning bolt 31 arranged on the fixing block 21 and a positioning piece 33 for pre-fixing the positions of the mounting block 22 and the fixing block 21, the positioning bolt 31 is positioned on one side of the mounting block 22, which is far away from the baffle plate 32, the positioning bolt 31 penetrates through the fixing block 21 in a threaded manner and is inserted into the sliding groove 23, and the positioning bolt 31 is movably attached to and abutted against the side wall of the mounting block 22, which is far away from the baffle plate 32; when the technical staff installs the cold heading plate 2, firstly, the technical staff slides the installation block 22 into the sliding groove 23 until the side wall of the installation block 22 is attached to the baffle 32, at this time, the installation block 22 is not easy to slide in the sliding groove 23 through the pre-fixing piece, so as to pre-fix the installation block 22, then the positioning bolt 31 and the installation block 22 are abutted against the side wall far away from the baffle 32 through screwing in the positioning bolt 31, so as to fix the installation block 22, at this time, the installation block 22 is not easy to slide in the sliding groove 23, and thus stable installation and fixation of the cold heading plate 2 and the cold heading head 13 are realized.

A first positioning hole 331 is formed in the top side of the mounting block 22, a second positioning hole 332 is formed in the top side of the fixed block 21, the first positioning hole 331 is distributed through the sliding groove 23 of the mounting block 22, the positioning piece 33 comprises a positioning block 333 which is elastically arranged in the second positioning hole 332, the positioning block 333 movably protrudes out of the second positioning hole 332 and is distributed through the first positioning hole 331, the side wall of the positioning block 333 is movably abutted against the side wall of the first positioning hole 331, one end of the positioning block 333, which is positioned in the second positioning hole 332, is fixedly connected with a positioning spring 334, and the other end of the positioning spring 334 is fixedly connected with the inner bottom wall of the second positioning hole 332; at this time, when the cold header 2 is replaced, a technician first presses the positioning block 333, under the action of elastic compression force, the positioning block 333 is immersed into the second positioning hole 332, and when the first positioning hole 331 corresponds to the second positioning hole 332 by sliding the mounting block 22, the positioning block 333 pops up under the action of elastic restoring force, so that the mounting block 22 is not easy to slide relatively, and the positions of the mounting block 22 and the fixing block 21 are pre-fixed.

Because the positioning block 333 needs to be additionally pressed when the mounting block 22 is mounted, the operation is troublesome, the side wall of the positioning block 333 far away from the baffle 32 is inclined, the inclined side of the positioning block 333 is movably abutted against and attached to the side wall of the fixed block 21, and the thickness of the positioning block 333 protruding from the end side of the second positioning block 333 is smaller than the width of the positioning block in the second positioning hole 332; when a technician inserts the mounting block 22 into the sliding groove 23 to slide the mounting block 22, the side wall of the fixed block 21 is movably abutted against and attached to the inclined side of the positioning block 333, and when the fixed block 21 is slid, the positioning block 333 is submerged into the second positioning hole 332 under the abutment of the fixed block 21 until the first positioning hole 331 corresponds to the second positioning hole 332, and at this time, the positioning block 333 protrudes out of the second positioning hole 332 under the action of elastic restoring force and penetrates through the first positioning hole 331, so that the pre-positioning of the fixed block 21 and the mounting block 22 is realized.

The positioning blocks 333 are provided with a plurality of groups along the sliding direction of the mounting block 22, in the utility model, the positioning blocks 333 are provided with three groups which are uniformly distributed at intervals, and the mounting block 22 is provided with a synchronizing piece 34 for synchronously adjusting the three groups of positioning blocks 333; referring to fig. 2 and 3, the mounting block 22 is provided with a synchronization groove 342, the opening direction of the synchronization groove 342 is consistent with the sliding direction of the mounting block 22, the synchronization groove 342 is communicated with the plurality of second positioning holes 332, and the connecting rod 341 sequentially penetrates through the three positioning blocks 333 and is fixedly connected with the positioning blocks 333; when the technician slides the mounting block 22 to make the fixing block 21 abut against the positioning block 333, the positioning block 333 drives the connecting rod 341 to move downward in the synchronization groove 342, so that the positioning blocks 333 slide toward the second positioning hole 332 at the same time, and simultaneous adjustment of the positioning blocks 333 is realized.

Meanwhile, in the practical compression test, it is found that, because the tubular sample needs to be placed on the workbench 12, the tubular sample is not easy to fix after being placed on the workbench 12, when the cold heading plate 2 descends, the tubular sample is easy to roll and shift, so that the accuracy of the compression test is reduced, therefore, in order to improve the problem, the workbench 12 is also provided with the limiting plate 4 and the abutting plate 41, the limiting plate 4 and the abutting plate 41 are oppositely arranged along the length direction of the tubular sample when being placed, the tubular sample is movably placed between the limiting plate 4 and the abutting plate 41, and the side wall, close to the abutting plate 41 Hu Ding, of the limiting plate 4 is movably attached to the two ends of the tubular sample.

Meanwhile, in order to simplify the operation when placing the tubular sample, the abutting plate 41 is slidably arranged on the workbench 12, an adjusting groove 42 is formed in the workbench 12, a limiting rod 43 is fixedly connected in the adjusting groove 42, one end of the abutting plate 41 extends into the adjusting groove 42 and is slidably matched with the adjusting groove 42, the limiting rod 43 penetrates through one end of the abutting plate 41 extending into the adjusting groove 42 and is slidably matched with the abutting plate 41, an adjusting spring 44 is fixedly connected to the side wall of the abutting plate 41, and the other end of the adjusting spring 44 is fixedly connected with the inner bottom wall of the adjusting groove 42.

When the technical staff needs to detect the tubular sample, the technical staff places the tubular sample on the workbench 12, and the spacing between the abutting plate 41 and the limiting plate 4 is enlarged by poking the abutting plate 41, so that the placement of the tubular sample is simpler, meanwhile, when the tubular samples with different diameters are detected in a compression mode, the length standards of the tubular samples with different diameters are inconsistent, the limiting plate 4 and the abutting plate 41 abut against the tubular sample with the unsmooth degree, and the tubular sample is always located under the cold heading plate 2, so that errors caused by rolling of the tubular sample in the compression test are reduced.

In order to further improve the stability of clamping the tubular sample, a clamping plate 45 is fixedly connected to one side, close to each other, of the abutting plate 41 and the limiting plate 4, and the clamping plate 45 movably stretches into the tubular sample and is movably attached to the inner side wall of the filled sample; when the limiting plate 4 and the abutting plate clamp the tubular sample, the arranged clamping plate 45 stretches into the tubular sample and abuts against the inner wall of the tubular sample, so that the filled sample is not easy to rotate and the tubular sample is not easy to roll.

The implementation principle of the microcomputer control electronic universal testing machine provided by the embodiment of the utility model is as follows: when detecting the tubular sample, a technician places the tubular sample on the workbench 12, and the cold heading head 13 descends so that the cold heading plate 2 compresses and detects the tubular sample; meanwhile, when tubular samples with different pipe diameters are detected and the cold heading plates 2 with different sizes are required to be replaced, a technician slides the mounting block 22 into the sliding groove 23, the side wall of the fixed block 21 is movably abutted against and attached to the inclined side of the positioning block 333, and when the fixed block 21 is slid, the positioning block 333 is submerged into the second positioning hole 332 under the abutting action of the fixed block 21 until the first positioning hole 331 corresponds to the second positioning hole 332, and at the moment, the positioning block 333 protrudes out of the second positioning hole 332 under the action of elastic restoring force and penetrates through the first positioning hole 331 to realize the pre-positioning of the fixed block 21 and the mounting block 22; until the side wall of the mounting block 22 is attached to the baffle plate 32, then the positioning bolt 31 is screwed in to enable the positioning bolt 31 and the side wall of the mounting block 22 far away from the baffle plate 32 to abut against each other, so that the mounting block 22 is fixed, and at the moment, the mounting block 22 is not easy to slide in the sliding groove 23, so that the cold heading plate 2 and the cold heading head 13 are stably mounted and fixed.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (8)

1. The utility model provides a microcomputer control electronic type universal testing machine, includes frame (1), slides and sets up test board on frame (1), locates fixture (11), workstation (12) and cold heading head (13) on frame (1), its characterized in that: the cold header (13) is provided with a cold header plate (2), and the cold header (13) is also provided with a fixing mechanism for keeping the cold header (13) and the cold header plate (2) stably connected;

the fixing mechanism comprises a mounting block (22) arranged on the cold heading head (13), a fixing block (21) arranged on the cold heading plate (2) and a connecting assembly (3) used for enabling the relative position of the mounting block (22) and the fixing block (21) to be constant, wherein a sliding groove (23) is formed in the fixing block (21), the mounting block (22) is movably inserted into the sliding groove (23) and is in sliding fit with the inner side wall of the sliding groove (23), and the opening of the sliding groove (23) close to the mounting block (22) is narrower than the width of the inner bottom wall of the sliding groove (23).

2. The microcomputer controlled electronic universal testing machine of claim 1, wherein: the sliding groove (23) is in an opening shape along one end of the set direction, the other end of the sliding groove is provided with a baffle (32), the baffle (32) is propped against the side wall of the installation block (22) in a movable mode, the connecting assembly (3) comprises a positioning bolt (31) arranged on the fixed block (21) and a positioning piece (33) used for pre-fixing the installation block (22) and the fixed block (21), and the positioning bolt (31) is propped against the side wall of the installation block (22) away from the baffle (32) in a movable mode.

3. The microcomputer controlled electronic universal testing machine of claim 2, wherein: the mounting block (22) is provided with a first positioning hole (331), the fixing block (21) is provided with a second positioning hole (332), the positioning piece (33) comprises a positioning block (333) which is elastically arranged in the second positioning hole (332), the positioning block (333) is movably protruded out of the second positioning hole (332) to be arranged, and the positioning block (333) movably penetrates through the first positioning hole (331).

4. A microcomputer controlled electronic universal testing machine according to claim 3, wherein: the positioning blocks (333) are provided with a plurality of groups, the positioning blocks (333) are distributed at intervals along the sliding direction of the fixed block (21), and the mounting block (22) is also provided with a synchronizing piece (34) for synchronously adjusting the positioning blocks (333).

5. The microcomputer controlled electronic universal testing machine according to claim 4, wherein: the installation piece (22) is provided with a synchronous groove (342), the synchronous groove (342) is consistent with the sliding direction of the fixed block (21), the synchronous groove (342) is communicated with the second positioning holes (332), the synchronous piece (34) comprises a connecting rod (341), and the connecting rod (341) is fixedly connected with the connecting rods (341).

6. The microcomputer controlled electronic universal testing machine of claim 5, wherein: be equipped with limiting plate (4) and support tight board (41) on workstation (12), limiting plate (4) with support tight board (41) and lay relatively, tubular sample activity place in limiting plate (4) with support between tight board (41), just limiting plate (4) with support tight board (41) one side that is close to each other with the both ends activity of tubular sample support tightly.

7. The microcomputer controlled electronic universal testing machine of claim 6, wherein: the abutting plate (41) is arranged on the workbench (12) in a sliding mode, and an elastic piece for driving the abutting plate (41) to elastically reciprocate is further arranged on the workbench (12).

8. The microcomputer controlled electronic universal testing machine of claim 7, wherein: the limiting plate (4) and the abutting plate (41) are respectively provided with a clamping plate (45) on the side wall close to each other, and the clamping plates (45) are attached to the inner side wall of the tubular sample.