CN211652334U

CN211652334U - Concrete test block positioning device

Info

Publication number: CN211652334U
Application number: CN201921990211.9U
Authority: CN
Inventors: 周欣竹; 叶浩; 叶晓倩; 吴振天; 张炜; 赵本禹; 茅文韬; 洪卓远; 郑建军
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-10-09
Anticipated expiration: 2029-11-18

Abstract

The invention discloses a concrete test block positioning device which comprises a supporting mechanism, a positioning mechanism and a shell for wrapping the supporting mechanism; the supporting mechanism consists of a first supporting mechanism and a second supporting mechanism, and the second supporting mechanism is positioned below the first supporting mechanism and is fixedly connected with the first supporting mechanism; the positioning mechanism comprises a first positioning mechanism, a second positioning mechanism and a third positioning mechanism; the supporting mechanism is used for supporting the positioning mechanism, and the positioning mechanism can limit the sample to be tested to be positioned on the shaft center of the universal tester workbench. Concrete test block positioner, can adapt to not unidimensional workstation and concrete test block, through gear drive system's regulation, need change the mould when avoiding facing not unidimensional workstation and test block, provide the simplicity.

Description

Concrete test block positioning device

Technical Field

The utility model relates to a concrete test block positioner especially relates to a self-adaptation test block positioner in concrete splitting experiment.

Background

The mechanical property of concrete is one of the important indexes of the performance of concrete, and directly determines the strength and durability of the concrete. In the fields of building structure roads and bridges and the like, the compressive strength grade of concrete is specified, and the requirement of high degree is provided for the tensile strength of the concrete. In general, a laboratory replaces concrete tensile strength with concrete splitting tensile strength, and experimental data with high reliability can be easily obtained within an acceptable deviation range.

Due to the fixing of the size and shape of the clamp, the splitting tensile strength of concrete test blocks with different shapes is difficult to compare transversely. In the experimental process, whether the axis of the test block is overlapped with the axis of the pressure surface of the universal testing machine needs to be judged by human eyes, if certain deviation exists, the experimental data error is large, and the evaluation of the concrete strength grade is influenced. In addition, the simplicity of the clamp is still to be improved.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to prior art, provide a concrete test block positioner, come to realize the accurate location universal tester pressure surface axle center of device through gear symmetry transmission rack to can adjust the test block of different shape sizes such as adaptation cube cylinder, replace current anchor clamps, directly improve the suitability and the accuracy of device, provide maneuverability for further reacing the higher experimental data of reliability. After coordinating the functions of the various aspects, improvements in terms of simplicity are strived for.

In order to solve the technical problem, the purpose of the utility model is realized through the following technical scheme:

a concrete test block positioning device comprises a supporting mechanism, a positioning mechanism and a shell wrapping the supporting mechanism;

the supporting mechanism consists of a first supporting mechanism and a second supporting mechanism, and the first supporting mechanism is positioned above the second supporting mechanism and is fixedly connected with the second supporting mechanism; the first supporting mechanism is composed of a first construction plate, a first connecting part and a second construction plate which are arranged from bottom to top in the vertical direction, the first construction plate is parallel to the second construction plate, the first connecting part fixedly connects the first construction plate and the second construction plate into a whole to form an I shape, the first construction plate and the second construction plate are matched in size, and a first through groove is formed in the center of the first connecting part; the second supporting mechanism is composed of a third constructional plate, a second connecting part and a fourth constructional plate which are arranged from bottom to top in the vertical direction, the third constructional plate is parallel to the fourth constructional plate, the third constructional plate and the fourth constructional plate are fixedly connected into a whole by the second connecting part to form an I shape, the third constructional plate and the fourth constructional plate are matched in size, and a second through groove is formed in the center of the second connecting part; the first construction plate is connected with the fourth construction plate in a stepped manner;

the positioning mechanism comprises a first positioning mechanism, a second positioning mechanism and a third positioning mechanism; the first positioning mechanism consists of a first knob, a first positioning shaft, a first limiting sheet, a first rolling gear, a first sliding guide rail, a second sliding guide rail, a first sliding block, a second sliding block, a first positioning rod and a second positioning rod; the two ends of the first positioning shaft are respectively connected with a first knob and a first rolling gear, one end of the first positioning shaft is provided with an external thread, the first knob is provided with a first internal thread through hole matched with the external thread of the first positioning shaft, the first knob is in threaded connection with the first positioning shaft, the first limiting piece is arranged between the first knob and the first rolling gear, and the first limiting piece is fixedly connected with the first positioning shaft; the first sliding block is slidably arranged in the first sliding guide rail, the first sliding guide rail is fixed on one side of the first construction plate, and the first sliding guide rail is parallel to the length direction of the first construction plate; the first sliding block comprises a first body with a rectangular cross section and a first protrusion arranged in the middle of the first body, the first sliding guide rail comprises a first groove body for accommodating the first body and a first notch for the first protrusion to penetrate through, and the first notch is formed in the middle of the upper surface of the first groove body and is opened upwards; a first fixed rod and a first stop block are respectively arranged at two ends of the first bulge, and the upper end surface of the bulge between the first fixed rod and the first stop block is in a tooth shape and is meshed with the first rolling gear; the first positioning rod is fixedly connected with the first sliding block through a first fixing rod, and the first positioning rod is perpendicular to the first sliding block;

the second sliding guide rail is arranged on one side of the second construction plate, is positioned on the same side as the first sliding guide rail and corresponds to the first sliding guide rail; the second sliding block is slidably arranged in the second sliding guide rail, the second sliding guide rail is fixed on one side of the second construction plate, and the second sliding guide rail is parallel to the length direction of the second construction plate; the second sliding block comprises a second body with a rectangular cross section and a second protrusion arranged in the middle of the second body, the second sliding guide rail comprises a second groove body for accommodating the second body and a second notch for the second protrusion to penetrate through, and the second notch is formed in the middle of the lower surface of the second groove body and is downward in opening; a second fixed rod and a second stop block are respectively arranged at two ends of the second bulge, the upper end surface of the bulge between the second fixed rod and the second stop block is in a tooth shape and is meshed with the second rolling gear, and the second fixed rod and the first stop block are positioned at the same side of the vertical line; the second positioning rod is fixedly connected with the second sliding block through the second fixing rod; the second fixed rod is perpendicular to the second sliding block, and the first fixed rod and the second fixed rod are positioned on the same side of the first sliding block or the second sliding block; a first circular ring and a second circular ring are respectively arranged on the first positioning rod and the second fixing rod, the first circular ring is in sliding connection with the first positioning rod, and the second circular ring is in sliding connection with the second fixing rod;

the first rolling gear is meshed with a first bulge on the first sliding block and a second bulge on the second sliding block at the same time, and the first rolling gear drives the first sliding block and the second sliding block to slide in the first sliding guide rail and the second sliding guide rail in an opposite direction or in a separated direction through rotation;

the second positioning mechanism consists of a second knob, a second positioning shaft, a second limiting sheet, a second rolling gear, a third sliding guide rail, a fourth sliding guide rail, a third sliding block, a fourth sliding block, a third positioning rod and a fourth positioning rod; one end of the second positioning shaft is connected with the second knob, the other end of the second positioning shaft is fixedly connected with the second rolling gear, one end of the second positioning shaft is provided with an external thread, the second knob is provided with a second internal thread through hole matched with the external thread of the second positioning shaft, the second knob is in threaded connection with the second positioning shaft, a second limiting piece is arranged between the second knob on the second positioning shaft and the second rolling gear, and the second limiting piece is fixedly connected with the second positioning shaft; the third sliding block is slidably arranged in the third sliding guide rail, the third sliding guide rail is fixed on one side of the third structural plate, and the third sliding guide rail is parallel to the length direction of the third structural plate; the third sliding block comprises a third body with a rectangular cross section and a third protrusion arranged in the middle of the third body, the third sliding guide rail comprises a third groove body for accommodating the third body and a third notch for the third protrusion to penetrate through, and the third notch is formed in the middle of the upper surface of the third groove body and is upward in opening direction; a third fixed rod and a third stop block are respectively arranged at two ends of the third bulge, and the upper end surface of the bulge between the third fixed rod and the third stop block is toothed and is meshed with the second rolling gear; the third positioning rod is fixedly connected with the third sliding block through a third fixing rod, and the third positioning rod is perpendicular to the third sliding block;

the fourth sliding guide rail is arranged on one side of the fourth construction plate, and is positioned on the same side as the third sliding guide rail and corresponds to the third sliding guide rail; the fourth sliding block is slidably arranged in the fourth sliding guide rail, the fourth sliding guide rail is fixed on one side of the fourth structural plate, and the fourth sliding guide rail is parallel to the length direction of the fourth structural plate; the fourth sliding block comprises a fourth body with a rectangular cross section and a fourth bulge arranged in the middle of the fourth body, the fourth sliding guide rail comprises a fourth groove body for accommodating the fourth body and a fourth notch for the fourth bulge to penetrate through, and the fourth notch is formed in the middle of the lower surface of the fourth groove body and is downward in opening; a fourth fixed rod and a fourth stop block are respectively arranged at two ends of the fourth protrusion, the upper end surface of the protrusion between the fourth fixed rod and the fourth stop block is in a tooth shape and is meshed with the second rolling gear, and the fourth fixed rod and the third stop block are positioned at the same side of the vertical line; the fourth positioning rod is fixedly connected with the fourth sliding block through the fourth fixing rod; the fourth fixing rod is perpendicular to the fourth sliding block, and the third fixing rod and the fourth fixing rod are positioned on the same side of the third sliding block or the fourth sliding block;

the second rolling gear is meshed with a third bulge on the third sliding block and a fourth bulge on the fourth sliding block at the same time, and the second rolling gear drives the third sliding block and the fourth sliding block to slide in a third sliding guide rail and a fourth sliding guide rail respectively through rotation;

the positioning mechanism III comprises an I-shaped limiting sliding plate, a first baffle guide rail, a second baffle guide rail and a Pi-shaped limiting plate, the I-shaped limiting sliding plate is composed of a fifth construction plate, a third connecting part and a sixth construction plate which are arranged from bottom to top in the vertical direction, the fifth construction plate is parallel to the sixth construction plate, the third connecting part is installed between the fifth construction plate and the sixth construction plate and is positioned in the center position to fixedly connect the fifth construction plate and the sixth construction plate into a whole to form an I-shaped structure with hollowed-out areas on two sides, the first circular ring and the second circular ring are respectively installed in the hollowed-out areas on two sides of the I-shaped limiting sliding plate, and the distance between the fifth construction plate and the sixth construction plate just enables the first circular ring and the second circular ring to slide in the hollowed-out areas; the fifth construction plate is matched with the sixth construction plate in size; a fifth slide block and a sixth slide block are respectively arranged on two sides of the fifth construction plate, the fifth slide block and the sixth slide block are respectively parallel to the end surfaces of two ends of the fifth construction plate, and the I-shaped limiting slide plate is parallel to the first construction plate; one side of the first baffle guide rail and one side of the second baffle guide rail are respectively fixed at two ends of the same side of the first constructional plate, the first baffle guide rail and the second baffle guide rail are parallel to each other and are vertical to the first constructional plate, and the first baffle guide rail is matched with the second baffle guide rail; the first baffle guide rail is provided with a first guide rail groove matched with the fifth slide block, the second baffle guide rail is provided with a second guide rail groove matched with the fifth slide block, and the I-shaped limiting slide plate can slide in the first guide rail groove and the second guide rail groove respectively through the fifth slide block and the sixth slide block to form synchronous motion parallel to the first constructional plate; the pi-shaped limiting plate is composed of a third baffle, a seventh sliding block and an eighth sliding block, wherein the seventh sliding block comprises a seventh body with a rectangular cross section, a sixth bulge arranged in the middle of the seventh body and a first limiting sliding plate arranged below the seventh body; the eighth sliding block comprises an eighth body with a rectangular cross section, a seventh bulge arranged in the middle of the eighth body and a second limiting sliding plate arranged below the eighth body; the third baffle plate comprises a fifth groove body for accommodating the seventh body and the eighth body and a fifth notch for the sixth bulge and the seventh bulge to penetrate through, and the fifth notch is formed in the middle of the upper surface of the fifth groove body and is opened upwards; the third baffle plate also comprises a sixth notch for the first limiting sliding plate and the second limiting sliding plate to penetrate through, and the opening of the sixth notch is downward; the first limiting sliding plate and the second limiting sliding plate are respectively provided with a first limiting through groove and a second limiting through groove, the first limiting through groove and the second limiting through groove are used for the first locating rod and the second locating rod to penetrate through, the first locating rod and the second locating rod are respectively matched with the first limiting through groove and the second limiting through groove, and the first locating rod and the second locating rod are kept in a parallel state through the first limiting through groove of the seventh sliding block and the second limiting through groove of the eighth sliding block; the third baffle is parallel to the second constructional plate along the length direction; the side surface of the third baffle plate is provided with a fifth bulge, the second construction plate is provided with a first limiting groove capable of fixing the fifth bulge, and the first limiting groove is matched with the fifth bulge; a second limiting groove matched with the fifth bulge is formed in the side, away from the second construction plate, of the sixth construction plate, and the second limiting groove is matched with the fifth bulge; the third baffle plate is detachably fixed on the second construction plate or the sixth construction plate, and the first positioning rod and the second positioning rod respectively penetrate through the first limiting through groove of the seventh sliding block and the second limiting through groove of the eighth sliding block in a horizontal state;

the shell is internally hollow, the first support mechanism, the first sliding guide rail and the second sliding guide rail which are connected with the first support mechanism, the second support mechanism, the third sliding guide rail and the fourth sliding guide rail which are connected with the second support mechanism are uniformly distributed in the shell, the shell is perpendicular to the first locating rod, the side surface of the shell, which is close to the side of the first locating rod, is open, the side surface plate, which corresponds to the opposite side of the open side, is provided with a first reserved hole and a second reserved hole, and the first locating shaft and the second locating shaft respectively penetrate through the first reserved hole and the second reserved hole and are matched with the first reserved hole and the second reserved hole; the first knob and the second knob are respectively arranged on the first positioning shaft and the second positioning shaft and are positioned on the outer side of the side panel, the first limiting piece is arranged between the inner side of the side panel and the first rolling gear, the second limiting piece is arranged between the inner side of the side panel and the second rolling gear, the distance between the first limiting piece and the side panel is smaller than the width of the first rolling gear, and the distance between the second limiting piece and the side panel is smaller than the width of the second rolling gear.

Furthermore, the maximum distance between the third positioning rod and the fourth positioning rod is at least larger than the diameter of the workbench of the universal testing machine.

Further, the distance between the first baffle guide rail and the second baffle guide rail is slightly smaller than the diameter of the workbench of the universal testing machine.

Further, the biggest interval that removes between first locating lever and the second locating lever with the spacing slide plate size phase-match of I shape.

The integral detachable function of the device of the invention ensures that the whole device is more flexible, saves space and reduces storage difficulty.

The use method of the device comprises the following steps: the device is assembled, then the second positioning shaft is rotated to enable the third positioning rod and the fourth positioning rod to clamp a workbench of the universal testing machine and keep the first baffle guide rail and the second baffle guide rail to be contacted with the workbench and kept horizontal, the second knob is rotated to fix the device, namely, the device can be clamped on the workbench, then a sample to be tested is placed on the workbench and positioned in a space formed by the first positioning rod, the second positioning rod and the I-shaped limiting sliding plate, the first positioning shaft is rotated until the first positioning rod and the second positioning rod are close to each other and clamp the sample to be tested, then the first knob is screwed to fix the sample to be tested, the sample to be tested moves to the position where the first positioning rod and the second positioning rod both provide power through the first rolling gear, so that the displacements of the first positioning rod and the second positioning rod are equal, and the limited block to be tested is positioned on a central line of the workbench, and then manually shifting the I-shaped limiting sliding plate to position the sample to be detected in all directions. The axes of the working table, the positioning device and the block to be tested are fixed in the same vertical plane, so that the force on the axis of the pressure surface of the universal testing machine is just applied to the axis of the concrete block, and the accuracy of the concrete splitting experiment result is guaranteed. After the preparation work is finished, the universal testing machine is started, after a pre-pressure is caused to the test block to be tested, the first knob is unscrewed, the first positioning shaft is rotated to enable the first positioning rod and the second positioning rod to leave the test block to be tested, the test data is prevented from deviating due to the fact that the test block to be tested is subjected to force caused by the first positioning rod and the second positioning rod in the splitting tensile test process, normal test processes are influenced, and the test efficiency and the material utilization rate are reduced.

In the moving process, the pi-shaped limiting plate is arranged on the second construction plate, if a sample to be detected is too large, the first positioning rod and the second positioning rod which are close to the end of the I-shaped limiting sliding plate cannot be in a mutually parallel state, the pi-shaped limiting plate can be taken down from the second construction plate and is arranged on the fifth construction plate of the I-shaped limiting sliding plate, the positions of the first positioning rod and the second positioning rod are limited to be mutually parallel through the first limiting through groove and the second limiting through groove respectively, and therefore the phenomenon that the symmetrical movement generated by a gear transmission structure is influenced or the internal structure is damaged due to the fact that the end portion is suspended and cannot clamp a large test block is avoided.

Compared with the prior art, the beneficial effect that adopts above-mentioned technical scheme to produce has:

concrete test block positioner, can adapt to not unidimensional workstation and concrete test block, through gear drive system's regulation, need change the mould when avoiding facing not unidimensional workstation and test block, provide the simplicity. Under current laboratory environment, can satisfy the user demand of most of workstations and concrete test blocks, and install convenient to use, improved the experimental efficiency of concrete mechanical properties, sparingly change the mould time, optimize the experiment flow.

Drawings

FIG. 1 is a first schematic view of the concrete test block positioning device in the embodiment 1;

FIG. 2 is a schematic view of the practical operation of the positioning device for testing concrete test blocks in example 1;

FIG. 3 is a schematic view showing an internal structure of the positioning device for a test concrete block in embodiment 1;

FIG. 4 is a schematic view of a positioning mechanism of the positioning device for testing concrete test blocks in embodiment 1;

FIG. 5 is a schematic view of a third baffle plate slider of the test concrete test block positioning device in embodiment 1;

FIG. 6 is a schematic view of a third baffle of the test concrete test block positioning device in example 1;

FIG. 7 is a side view of the positioning mechanism of the test concrete block positioning device in example 1;

FIG. 8 is a schematic view of a slide rail of the positioning mechanism of the concrete test block positioning device in accordance with embodiment 1;

FIG. 9 is a structural view of a slide block of the positioning mechanism of the test concrete block positioning device in accordance with embodiment 1;

FIG. 10 is a second side view of the positioning mechanism of the test concrete block positioning device in example 1;

FIG. 11 is a schematic view of a second sliding guide of the positioning mechanism of the positioning device for testing concrete test blocks in embodiment 1;

FIG. 12 is a structural view of a second sliding block of the positioning mechanism of the positioning device for testing concrete test blocks in embodiment 1;

FIG. 13 is a structural view of a housing of the test concrete block positioning device in example 1;

FIG. 14 is a drawing showing the connection between the casing of the concrete test block positioning device and the guide rails of the gear transmission part in accordance with example 1;

FIG. 15 is a view showing the relative positions of the housing and the gear of the positioning device for testing concrete test blocks in example 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the invention.

The concrete test block positioning device of the present invention will be described in detail with reference to the specific structure and principle.

In the figure: 1-1. side panels; 1-2, a first preformed hole; 1-3, second preformed hole; 1-4. a second build plate; 1-5. a first build plate; 1-6. a fourth build plate; 1-7. a third build plate; 1-8, a first through groove; 1-9. a second through groove; 1-10. a shell; 1-11 first connection portions; 1-12 second connecting parts; 1-13 first limiting grooves; 2-1. a sixth build plate; 2-2. a second limit groove; 2-3, a fifth slide block; 2-4. a sixth slide block; 2-5. a fifth fabrication panel; 2-6. a third connecting part; 2-7. a third baffle; 2-8, a fifth bulge; 2-9. a fifth notch; 2-10, a sixth notch; 2-11, a first limit sliding plate; 2-12, a seventh body; 2-13, a sixth bump; 2-14, a second limit sliding plate; 2-15. eighth body; 2-16, a seventh bump; 2-17. a first baffle guide rail; 2-18. a second baffle guide rail; 2-19. a first guide rail groove; 2-20. a second guide rail groove; 2-21, a fifth groove body; 2-22, a first limiting through groove; 2-23, a second limiting through groove; 3-1. a first rolling gear; 3-2. a second slide block; 3-3. a second protrusion; 3-4. a first slide block; 3-5, a first protrusion; 3-6, a second sliding guide rail; 3-7, a first sliding guide rail; 3-8, a second body; 3-9. a first body; 3-10. a first knob; 3-11, a first limiting sheet; 3-12. a first positioning shaft; 3-13, a first positioning rod; 3-14. a second positioning rod; 3-15. a first ring; 3-16. a second ring; 3-17. a second notch; 3-18. a second groove body; 3-19. a first notch; 3-20, a first groove body; 3.21 a second fixing rod; 3.22 first fixing bar; 3-23. a first internally threaded through hole; 3-24. a first stop block; 3-25. a second stop block; 3-26. a third block; 3-27. a fourth stop; 4-1. a second rolling gear; 4-2. a fourth slide block; 4-3, a fourth bump; 4-4. a third slide block; 4-5. a third bump; 4-6. a fourth sliding guide rail; 4-7. a third sliding guide rail; 4-8. a fourth body; 4-9. a third body; 4-10. a second knob; 4-11. a second limiting sheet; 4-12. a second positioning shaft; 4-13, a third positioning rod; 4-14, a fourth positioning rod; 4-15, a fourth notch; 4-16, a fourth groove body; 4-17. a third notch; 4-18. a third trough body; 4-19. a fourth fixing rod; 4-20, a third fixing rod; 4-21. a second internally threaded through hole; 5. testing blocks; 6. a work bench.

Example 1:

a concrete test block positioning device, which comprises a base,

the supporting mechanism consists of a first supporting mechanism and a second supporting mechanism, and the first supporting mechanism is positioned above the second supporting mechanism and is fixedly connected with the second supporting mechanism; the first supporting mechanism is composed of a first construction plate 1-5, a first connecting part 1-11 and a second construction plate 1-4 which are arranged from bottom to top in the vertical direction, the first construction plate 1-5 is parallel to the second construction plate 1-4, the first connecting part 1-11 fixedly connects the first construction plate 1-5 and the second construction plate 1-4 into a whole to form an I shape, the first construction plate 1-5 is matched with the second construction plate 1-4 in size, and a first through groove 1-8 is arranged in the center of the first connecting part 1-11; the second supporting mechanism is composed of a third structural plate 1-7, a second connecting part 1-12 and a fourth structural plate 1-6 which are arranged from bottom to top in the vertical direction, the third structural plate 1-7 is parallel to the fourth structural plate 1-6, the third structural plate 1-7 and the fourth structural plate 1-6 are fixedly connected into a whole by the second connecting part 1-12 to form an I shape, the third structural plate 1-7 is matched with the fourth structural plate 1-6 in size, and a second through groove 1-9 is arranged in the center of the second connecting part 1-12; the first structural plate 1-5 is connected with the fourth structural plate 1-6 in a stepped manner;

the positioning mechanism comprises a first positioning mechanism, a second positioning mechanism and a third positioning mechanism; the first positioning mechanism consists of a first knob 3-10, a first positioning shaft 3-12, a first limiting sheet 3-11, a first rolling gear 3-1, a first sliding guide rail 3-7, a second sliding guide rail 3-6, a first sliding block 3-4, a second sliding block 3-2, a first positioning rod 3-13 and a second positioning rod 3-14; the two ends of the first positioning shaft 3-12 are respectively connected with a first knob 3-10 and a first rolling gear 3-1, one end of the first positioning shaft 3-12 is provided with an external thread, the first knob 3-10 is provided with a first internal thread through hole 3-23 matched with the external thread of the first positioning shaft 3-12, the first knob 3-10 is in threaded connection with the first positioning shaft 3-12, the first limiting piece 3-11 is arranged between the first knob 3-10 and the first rolling gear 3-1, and the first limiting piece 3-11 is fixedly connected with the first positioning shaft 3-12; the first sliding block 3-4 is slidably arranged in the first sliding guide rail 3-7, the first sliding guide rail 3-7 is fixed on one side of the first structural plate 1-5, and the first sliding guide rail 3-7 is parallel to the length direction of the first structural plate 1-5; the first sliding block 3-4 comprises a first body 3-9 with a rectangular cross section and a first protrusion 3-5 arranged in the middle of the first body 3-9, the first sliding guide rail 3-7 comprises a first groove 3-20 for accommodating the first body 3-9 and a first notch 3-19 for the first protrusion 3-5 to penetrate through, and the first notch 3-19 is arranged in the middle of the upper surface of the first groove 3-20 and has an upward opening; two ends of the first bulge 3-5 are respectively provided with a first fixed rod 3-22 and a first stop block 3-24, and the upper end surface of the bulge 3-5 between the first fixed rod 3-22 and the first stop block 3-24 is in a tooth shape and is meshed with the first rolling gear 3-1; the first positioning rod 3-13 is fixedly connected with the first sliding block 3-4 through a first fixing rod 3-22, and the first positioning rod 3-13 is perpendicular to the first sliding block 3-4;

the second sliding guide rail 3-6 is arranged at one side of the second constructional plate 1-4, and is positioned at the same side as and corresponds to the first sliding guide rail 3-7; the second sliding block 3-2 is slidably arranged in the second sliding guide rail 3-6, the second sliding guide rail 3-6 is fixed on one side of the second constructional plate 1-4, and the second sliding guide rail 3-6 is parallel to the length direction of the second constructional plate 1-4; the second sliding block 3-2 comprises a second body 3-8 with a rectangular cross section and a second protrusion 3-3 arranged in the middle of the second body 3-8, the second sliding guide rail 3-6 comprises a second groove 3-18 for accommodating the second body 3-8 and a second notch 3-17 for the second protrusion 3-3 to penetrate through, and the second notch 3-17 is arranged in the middle of the lower surface of the second groove 3-18 and has a downward opening; a second fixed rod 3-21 and a second stop block 3-25 are respectively arranged at two ends of the second protrusion, the upper end surface of the protrusion between the second fixed rod 3-21 and the second stop block 3-25 is in a tooth shape and is meshed with the second rolling gear 3-1, and the second fixed rod 3-21 and the first stop block 3-24 are positioned at the same side of a vertical line; the second positioning rod 3-14 is fixedly connected with the second sliding block 3-2 through the second fixing rod 3-21; the second fixed rod 3-21 is perpendicular to the second sliding block 3-2, and the first fixed rod 3-22 and the second fixed rod 3-21 are positioned at the same side of the first sliding block 3-4 or the second sliding block 3-2; the first positioning rod 3-13 and the second fixing rod 3-14 are respectively provided with a first circular ring 3-15 and a second circular ring 3-16, the first circular ring 3-15 is in sliding connection with the first positioning rod 3-13, and the second circular ring 3-16 is in sliding connection with the second fixing rod 3-14;

the first rolling gear 3-1 is simultaneously meshed with a first bulge 3-5 on the first sliding block 3-4 and a second bulge 3-3 on the second sliding block 3-2, and the first rolling gear 3-1 simultaneously drives the first sliding block 3-4 and the second sliding block 3-2 to slide in the first sliding guide rail 3-7 and the second sliding guide rail 3-6 in an opposite direction or in an opposite direction through rotation;

the second positioning mechanism consists of a second knob 4-10, a second positioning shaft 4-12, a second limiting sheet 4-11, a second rolling gear 4-1, a third sliding guide rail 4-7, a fourth sliding guide rail 4-6, a third sliding block 4-4, a fourth sliding block 4-2, a third positioning rod 4-13 and a fourth positioning rod 4-14; one end of the second positioning shaft 4-12 is connected with a second knob 4-10, the other end of the second positioning shaft is fixedly connected with the second rolling gear 4-1, one end of the second positioning shaft 4-12 is provided with an external thread, the second knob 4-10 is provided with a second internal thread through hole 4-21 matched with the external thread of the second positioning shaft 4-12, the second knob 4-10 is in threaded connection with the second positioning shaft 4-12, a second limiting piece 4-11 is arranged between the second knob 4-10 and the second rolling gear 4-1 on the second positioning shaft 4-12, and the second limiting piece 4-11 is fixedly connected with the second positioning shaft 4-12; the third sliding block 4-4 is slidably arranged in the third sliding guide rail 4-7, the third sliding guide rail 4-7 is fixed on one side of the third constructional plate 1-7, and the third sliding guide rail 4-7 is parallel to the length direction of the third constructional plate 1-7; the third sliding block 4-4 comprises a third body 4-9 with a rectangular cross section and a third protrusion 4-5 arranged in the middle of the third body, the third sliding guide rail 4-7 comprises a third groove 4-18 for accommodating the third body 4-9 and a third notch 4-17 for the third protrusion 4-5 to penetrate through, and the third notch 4-17 is arranged in the middle of the upper surface of the third groove 4-18 and is opened upwards; a third fixing rod 4-20 and a third stop block 3-26 are respectively arranged at two ends of the third protrusion, and the end surface between the third fixing rod 4-20 and the third stop block 3-26 is toothed and is meshed with the second rolling gear 4-1; the third positioning rod 4-13 is fixedly connected with the third sliding block 4-4 through a third fixing rod 4-20, and the third positioning rod 4-13 is perpendicular to the third sliding block 4-4;

the fourth sliding guide rail 4-6 is arranged at one side of the fourth constructional plate 1-6, and is positioned at the same side as and corresponds to the third sliding guide rail 4-7; the fourth sliding block 4-2 is slidably arranged in the fourth sliding guide rail 4-6, the fourth sliding guide rail 4-6 is fixed on one side of the fourth constructional plate 1-6, and the fourth sliding guide rail 4-6 is parallel to the length direction of the fourth constructional plate 1-6; the fourth sliding block 4-2 comprises a fourth body 4-8 with a rectangular cross section and a fourth protrusion 4-3 arranged in the middle of the fourth body 4-8, the fourth sliding guide rail 4-6 comprises a fourth groove 4-16 for accommodating the fourth body 4-8 and a fourth notch 4-15 for the fourth protrusion 4-3 to penetrate through, and the fourth notch 4-15 is arranged in the middle of the lower surface of the fourth groove 4-16 and is downward in opening; a fourth fixing rod 4-19 and a fourth stop block 3-27 are respectively arranged at two ends of the fourth protrusion 4-3, and the upper end surfaces of the protrusions of the fourth fixing rod 4-19 and the fourth stop block 3-27 are toothed and are matched with the second rolling gear 4-1; the fourth positioning rod 4-14 is fixedly connected with the fourth sliding block 4-2 through the fourth fixing rod 4-19; the fourth fixing rod 4-19 is perpendicular to the fourth sliding block 4-2, and the third fixing rod 4-20 and the fourth fixing rod 4-19 are positioned at the same side of the third sliding block 4-4 or the fourth sliding block 4-2;

the second rolling gear 4-1 is simultaneously meshed with a third bulge 4-5 on the third sliding block 4-4 and a fourth bulge 4-3 on the fourth sliding block 4-2, and the second rolling gear 4-1 simultaneously drives the third sliding block 4-4 and the fourth sliding block 4-2 to respectively slide in a third sliding guide rail 4-7 and a fourth sliding guide rail 4-6 through rotation;

the third positioning mechanism comprises an I-shaped limiting sliding plate, a first baffle guide rail 2-17, a second baffle guide rail 2-18 and a Pi-shaped limiting plate, the I-shaped limiting sliding plate is composed of a fifth construction plate 2-5, a third connecting part 2-6 and a sixth construction plate 2-1 which are arranged from bottom to top in the vertical direction, the fifth construction plate 2-5 is parallel to the sixth construction plate 2-1, the third connecting part 2-6 is arranged between the fifth construction plate 2-5 and the sixth construction plate 2-1 and is positioned at the center position to fixedly connect the fifth construction plate 2-5 and the sixth construction plate 2-1 into an I-shaped structure with hollow areas at two sides, the first circular ring 3-15 and the second circular ring 3-16 are respectively arranged in the hollow areas at two sides of the I-shaped limiting sliding plate, and the distance between the fifth structural plate 2-5 and the sixth structural plate 2-1 is just enough to enable the first circular ring 3-15 and the second circular ring 3-16 to slide in the hollow area; the fifth constructional plate 2-5 is matched with the sixth constructional plate 2-1 in size; a fifth slide block 2-3 and a sixth slide block 2-4 are respectively arranged on two sides of the fifth structural plate 2-5, the fifth slide block 2-3 and the sixth slide block 2-4 are respectively parallel to the end surfaces of two ends of the fifth structural plate 2-5, and the I-shaped limiting slide plate is parallel to the first structural plate 1-5; one side of each of the first baffle guide rails 2-17 and the second baffle guide rails 2-18 is respectively fixed at two ends of the same side of the first constructional plate 1-5, the first baffle guide rails 2-17 and the second baffle guide rails 2-18 are parallel to each other and are vertical to the first constructional plates 1-5, and the first baffle guide rails 2-17 are matched with the second baffle guide rails 2-18; the first baffle guide rail 2-17 is provided with a first guide rail groove 2-19 matched with the fifth slide block 2-3, the second baffle guide rail 2-18 is provided with a second guide rail groove 2-20 matched with the fifth slide block 2-3, and the I-shaped limiting slide plate can respectively slide in the first guide rail groove 2-19 and the second guide rail groove 2-20 through the fifth slide block 2-3 and the sixth slide block 2-4 to form synchronous motion parallel to the first constructional plate 1-5; the pi-shaped limiting plate is composed of a third baffle plate 2-7, a seventh sliding block and an eighth sliding block, wherein the seventh sliding block comprises a seventh body 2-1 with a rectangular cross section, a sixth bulge 2-13 arranged in the middle of the seventh body 2-12 and a first limiting sliding plate 2-11 arranged below the seventh body 2-12; the eighth sliding block comprises an eighth body 2-15 with a rectangular cross section, a seventh bulge 2-16 arranged in the middle of the eighth body 2-15 and a second limiting sliding plate 2-14 arranged below the eighth body 2-15; the third baffle 2-7 comprises a fifth groove body 2-21 for accommodating the seventh body 2-12 and the eighth body 2-15 and a fifth notch 2-9 for the sixth bulge 2-13 and the seventh bulge 2-16 to penetrate through, and the fifth notch 2-9 is arranged in the middle of the upper surface of the fifth groove body 2-21 and is opened upwards; the third baffle plate 2-7 also comprises a sixth notch 2-10 for the first limiting sliding plate 2-11 and the second limiting sliding plate 2-14 to penetrate through, and the sixth notch 2-10 is opened downwards; the first limiting sliding plate 2-11 and the second limiting sliding plate 2-14 are respectively provided with a first limiting through groove 2-22 and a second limiting through groove 2-23 for the first locating rod 3-13 and the second locating rod 3-14 to penetrate through, the first locating rod 3-13 and the second locating rod 3-14 are respectively matched with the first limiting through groove 2-22 and the second limiting through groove 2-23, and the first locating rod 3-13 and the second locating rod 3-14 are kept in a parallel state through the first limiting through groove 2-22 of the seventh sliding block 2-11 and the second limiting through groove 2-23 of the eighth sliding block 2-14; the third baffle plate 2-7 is parallel to the second constructional plate 1-4 along the length direction; a fifth bulge 2-8 is arranged on the side surface of the third baffle 2-7, a first limiting groove 1-13 capable of fixing the fifth bulge 2-8 is arranged on the second construction plate 1-4, and the first limiting groove 1-13 is matched with the fifth bulge 2-8; a second limiting groove 2-2 matched with the fifth bulge 2-8 is formed in the side, far away from the second structural plate 1-4, of the sixth structural plate 2-1, and the second limiting groove 2-2 is matched with the fifth bulge 2-8; the third baffle 2-7 is detachably fixed on the second structural plate 1-4 or the sixth structural plate 2-1, and ensures that the first positioning rod 3-13 and the second positioning rod 3-14 respectively penetrate through the first limiting through groove 2-22 of the seventh sliding block 2-11 and the second limiting through groove 2-23 of the eighth sliding block 2-14 in a horizontal state;

the shell 1-10 is hollow, the first support mechanism, the first sliding guide rail 3-7 and the second sliding guide rail 3-6 connected with the first support mechanism, the second support mechanism, the third sliding guide rail 4-7 and the fourth sliding guide rail 4-6 connected with the second support mechanism are uniformly distributed in the shell 1-10, the shell 1-10 is vertical to the first positioning rod 3-13, the side surface of the shell, which is close to the first positioning rod 3-13, is open, the side surface plate 1-1, which is opposite to the open side, is provided with a first reserved hole 1-2 and a second reserved hole 1-3, the first positioning shaft 3-12 and the second positioning shaft 4-12 respectively pass through the first reserved hole 1-2 and the second reserved hole 1-3, and is matched with the first preformed hole 1-2 and the second preformed hole 1-3; the first knob 3-10 and the second knob 4-10 are respectively arranged on the first positioning shaft 3-12 and the second positioning shaft 4-12 and are positioned at the outer side of the side panel 1-1, the first limiting piece 3-11 is arranged between the inner side of the side panel 1-1 and the first rolling gear 3-1, the second limiting piece 4-11 is arranged between the inner side of the side panel 1-1 and the second rolling gear 4-1, the distance between the first limiting piece 3-11 and the side panel 1-1 is smaller than the width of the first rolling gear 3-1, and the distance between the second limiting piece 4-11 and the side panel 1-1 is smaller than the width of the second rolling gear 4-1.

The maximum moving distance between the third positioning rod 4-13 and the fourth positioning rod 4-14 is at least larger than the diameter of the workbench 6 of the universal testing machine;

the distance between the first baffle guide rail 2-17 and the second baffle guide rail 2-18 is slightly smaller than the diameter of the workbench 6 of the universal testing machine;

the maximum distance between the first positioning rods 3-13 and the second positioning rods 3-14 is matched with the size of the I-shaped limiting sliding plate.

The shells 1-10 adopted by the invention are made of relatively light materials, so that the center of gravity of the device is positioned on the workbench without instability. The first positioning rod and the second positioning rod are made of metal materials with enough strength to provide enough driving force to push the test block; the first positioning rod and the second positioning rod are sleeved with flexible materials, and the flexible materials have certain compressibility and can assist the gear transmission device to further adjust under the condition that accurate positioning cannot be achieved only by means of gear transmission. The surfaces of the first baffle guide rail and the second baffle guide rail, which are in contact with the workbench, are bonded with high-friction-coefficient materials such as rubber, so that certain friction is guaranteed, and the device cannot lose connection with the workbench instantly under the influence of external force.

In the moving process, the pi-shaped limiting plate is arranged on the second construction plate, if a sample to be detected is too large, the first positioning rod and the second positioning rod which are close to the end of the I-shaped limiting sliding plate cannot be in a mutually parallel state, the pi-shaped limiting plate can be taken down from the second construction plate and arranged on the fifth construction plate of the I-shaped limiting sliding plate, the positions of the first positioning rod and the second positioning rod are limited to be mutually parallel through the first limiting through groove and the second limiting through groove respectively, and therefore the influence on the symmetrical motion generated by the gear transmission structure or the damage to the internal structure due to the fact that the end portion is suspended and cannot clamp a large test block is avoided.

Claims

1. The utility model provides a concrete test block positioner which characterized in that: comprises a supporting mechanism, a positioning mechanism and a shell (1-10) wrapping the supporting mechanism;

the supporting mechanism consists of a first supporting mechanism and a second supporting mechanism, and the first supporting mechanism is positioned above the second supporting mechanism and is fixedly connected with the second supporting mechanism; the first supporting mechanism is composed of a first construction plate (1-5), a first connecting part (1-11) and a second construction plate (1-4) which are arranged from bottom to top in the vertical direction, the first construction plate (1-5) is parallel to the second construction plate (1-4), the first connecting part (1-11) fixedly connects the first construction plate (1-5) and the second construction plate (1-4) into a whole to form an I shape, the first construction plate (1-5) is matched with the second construction plate (1-4) in size, and a first through groove (1-8) is formed in the center of the first connecting part (1-11); the second supporting mechanism is composed of a third structural plate (1-7), a second connecting part (1-12) and a fourth structural plate (1-6) which are arranged from bottom to top in the vertical direction, the third structural plate (1-7) is parallel to the fourth structural plate (1-6), the third structural plate (1-7) and the fourth structural plate (1-6) are fixedly connected into a whole by the second connecting part (1-12) to form an I shape, the third structural plate (1-7) is matched with the fourth structural plate (1-6) in size, and a second through groove (1-9) is formed in the center of the second connecting part (1-12); the first structural plate (1-5) is connected with the fourth structural plate (1-6) in a stepped manner;

the positioning mechanism comprises a first positioning mechanism, a second positioning mechanism and a third positioning mechanism; the first positioning mechanism consists of a first knob (3-10), a first positioning shaft (3-12), a first limiting piece (3-11), a first rolling gear (3-1), a first sliding guide rail (3-7), a second sliding guide rail (3-6), a first sliding block (3-4), a second sliding block (3-2), a first positioning rod (3-13) and a second positioning rod (3-14); the two ends of the first positioning shaft (3-12) are respectively connected with a first knob (3-10) and a first rolling gear (3-1), an external thread is arranged at one end of the first positioning shaft (3-12), a first internal thread through hole (3-23) matched with the external thread of the first positioning shaft (3-12) is arranged on the first knob (3-10), the first knob (3-10) is in threaded connection with the first positioning shaft (3-12), the first limiting piece (3-11) is arranged between the first knob (3-10) and the first rolling gear (3-1), and the first limiting piece (3-11) is fixedly connected with the first positioning shaft (3-12); the first sliding block (3-4) is slidably arranged in the first sliding guide rail (3-7), the first sliding guide rail (3-7) is fixed on one side of the first structural plate (1-5), and the first sliding guide rail (3-7) is parallel to the length direction of the first structural plate (1-5); the first sliding block (3-4) comprises a first body (3-9) with a rectangular cross section and a first protrusion (3-5) arranged in the middle of the first body (3-9), the first sliding guide rail (3-7) comprises a first groove body (3-20) for accommodating the first body (3-9) and a first notch (3-19) for the first protrusion (3-5) to penetrate through, and the first notch (3-19) is arranged in the middle of the upper surface of the first groove body (3-20) and is opened upwards; two ends of the first protrusion (3-5) are respectively provided with a first fixing rod (3-22) and a first stop block (3-24), and the upper end surface of the protrusion between the first fixing rod (3-22) and the first stop block (3-24) is in a tooth shape and is meshed with the first rolling gear (3-1); the first positioning rod (3-13) is fixedly connected with the first sliding block (3-4) through a first fixing rod (3-22), and the first positioning rod (3-13) is perpendicular to the first sliding block (3-4);

the second sliding guide rail (3-6) is arranged on one side of the second constructional plate (1-4), is positioned on the same side as the first sliding guide rail (3-7) and corresponds to the first sliding guide rail; the second sliding block (3-2) is slidably arranged in the second sliding guide rail (3-6), the second sliding guide rail (3-6) is fixed on one side of the second constructional plate (1-4), and the second sliding guide rail (3-6) is parallel to the length direction of the second constructional plate (1-4); the second sliding block (3-2) comprises a second body (3-8) with a rectangular cross section and a second protrusion (3-3) arranged in the middle of the second body (3-8), the second sliding guide rail (3-6) comprises a second groove body (3-18) for accommodating the second body (3-8) and a second notch (3-17) for the second protrusion (3-3) to penetrate through, and the second notch (3-17) is formed in the middle of the lower surface of the second groove body (3-18) and is downward in opening; a second fixing rod (3-21) and a second stop block (3-25) are arranged at two ends, far away from the first positioning rod (3-13), of the second protrusion (3-3), the upper end surface of the protrusion between the second fixing rod (3-21) and the second stop block (3-25) is in a tooth shape and is meshed with the second rolling gear (4-1), and the second fixing rod (3-21) and the first stop block (3-24) are located on the same side of a vertical line; the second positioning rod (3-14) is fixedly connected with the second sliding block (3-2) through the second fixing rod (3-21); the second fixing rod (3-21) is perpendicular to the second sliding block (3-2), and the first fixing rod (3-22) and the second fixing rod (3-21) are positioned on the same side of the first sliding block (3-4) or the second sliding block (3-2); the first positioning rod (3-13) and the second positioning rod (3-14) are respectively provided with a first circular ring (3-15) and a second circular ring (3-16), the first circular ring (3-15) is in sliding connection with the first positioning rod (3-13), and the second circular ring (3-16) is in sliding connection with the second positioning rod (3-14);

the first rolling gear (3-1) is simultaneously meshed with a first bulge (3-5) on the first sliding block (3-4) and a second bulge (3-3) on the second sliding block (3-2), and the first rolling gear (3-1) simultaneously drives the first sliding block (3-4) and the second sliding block (3-2) to slide in the first sliding guide rail (3-7) and the second sliding guide rail (3-6) in an opposite direction or in a separated direction through rotation;

the second positioning mechanism consists of a second knob (4-10), a second positioning shaft (4-12), a second limiting sheet (4-11), a second rolling gear (4-1), a third sliding guide rail (4-7), a fourth sliding guide rail (4-6), a third sliding block (4-4), a fourth sliding block (4-2), a third positioning rod (4-13) and a fourth positioning rod (4-14); one end of the second positioning shaft (4-12) is connected with the second knob (4-10), the other end is fixedly connected with the second rolling gear (4-1), one end of the second positioning shaft (4-12) is provided with an external thread, the second knob (4-10) is provided with a second internal thread through hole (4-21) matched with the external thread of the second positioning shaft (4-12), the second knob (4-10) is in threaded connection with the second positioning shaft (4-12), a second limiting sheet (4-11) is arranged between a second knob (4-10) on the second positioning shaft (4-12) and the second rolling gear (4-1), the second limiting sheet (4-11) is fixedly connected with the second positioning shaft (4-12); the third sliding block (4-4) is slidably arranged in the third sliding guide rail (4-7), the third sliding guide rail (4-7) is fixed on one side of the third constructional plate (1-7), and the third sliding guide rail (4-7) is parallel to the length direction of the third constructional plate (1-7); the third sliding block (4-4) comprises a third body (4-9) with a rectangular cross section and a third protrusion (4-5) arranged in the middle of the third body, the third sliding guide rail (4-7) comprises a third groove body (4-18) for accommodating the third body (4-9) and a third notch (4-17) for the third protrusion (4-5) to penetrate through, and the third notch (4-17) is arranged in the middle of the upper surface of the third groove body (4-18) and is opened upwards; a third fixing rod (4-20) and a third stop block (3-26) are respectively arranged at two ends of the third protrusion (4-5), and the upper end surface of the protrusion between the third fixing rod (4-20) and the third stop block (3-26) is in a tooth shape and is meshed with the second rolling gear (4-1); the third positioning rod (4-13) is fixedly connected with the third sliding block (4-4) through a third fixing rod (4-20), and the third positioning rod (4-13) is perpendicular to the third sliding block (4-4);

the fourth sliding guide rail (4-6) is arranged on one side of the fourth constructional plate (1-6) and is positioned on the same side as and corresponds to the third sliding guide rail (4-7); the fourth sliding block (4-2) is slidably arranged in the fourth sliding guide rail (4-6), the fourth sliding guide rail (4-6) is fixed on one side of the fourth constructional plate (1-6), and the fourth sliding guide rail (4-6) is parallel to the length direction of the fourth constructional plate (1-6); the fourth sliding block (4-2) comprises a fourth body (4-8) with a rectangular cross section and a fourth protrusion (4-3) arranged in the middle of the fourth body (4-8), the fourth sliding guide rail (4-6) comprises a fourth groove body (4-16) for accommodating the fourth body (4-8) and a fourth notch (4-15) for the fourth protrusion (4-3) to penetrate through, and the fourth notch (4-15) is formed in the middle of the lower surface of the fourth groove body (4-16) and is downward in opening; a fourth fixing rod (4-19) and a fourth stop block (3-27) are respectively arranged at two ends of the fourth protrusion (4-3), the end surface of the protrusion between the fourth fixing rod (4-19) and the fourth stop block (3-27) is in a tooth shape and is meshed with the second rolling gear (4-1), and the fourth fixing rod (4-19) and the third stop block (3-26) are positioned at the same side of a vertical line; the fourth positioning rod (4-14) is fixedly connected with the fourth sliding block (4-2) through the fourth fixing rod (4-19); the fourth fixing rod (4-19) is perpendicular to the fourth sliding block (4-2), and the third fixing rod (4-20) and the fourth fixing rod (4-19) are positioned on the same side of the third sliding block (4-4) or the fourth sliding block (4-2);

the second rolling gear (4-1) is simultaneously meshed with a third bulge (4-5) on the third sliding block (4-4) and a fourth bulge (4-3) on the fourth sliding block (4-2), and the second rolling gear (4-1) simultaneously drives the third sliding block (4-4) and the fourth sliding block (4-2) to respectively slide in a third sliding guide rail (4-7) and a fourth sliding guide rail (4-6) through rotation;

the positioning mechanism III comprises an I-shaped limiting sliding plate, first baffle guide rails (2-17), second baffle guide rails (2-18) and a Pi-shaped limiting plate, a fifth construction plate (2-5), a third connecting part (2-6) and a sixth construction plate (2-1) are arranged on the I-shaped limiting sliding plate from bottom to top in the vertical direction, the fifth construction plate (2-5) is parallel to the sixth construction plate (2-1), the third connecting part (2-6) is arranged between the fifth construction plate (2-5) and the sixth construction plate (2-1) and is positioned at the center position to fixedly connect the fifth construction plate (2-5) and the sixth construction plate (2-1) into an integral structure, the two sides of the I-shaped structure are provided with hollow areas, and the first circular ring (3-15) and the second circular ring (3-16) are respectively arranged on the first circular ring (3-15) and the second circular ring (3-16) of the I-shaped limiting sliding plate In the hollow areas on two sides of the I-shaped limiting sliding plate, the distance between the fifth structural plate (2-5) and the sixth structural plate (2-1) is just good, so that the first circular ring (3-15) and the second circular ring (3-16) can slide in the hollow areas; the fifth constructional plate (2-5) is matched with the sixth constructional plate (2-1) in size; a fifth sliding block (2-3) and a sixth sliding block (2-4) are respectively arranged on two sides of the fifth construction plate (2-5), the fifth sliding block (2-3) and the sixth sliding block (2-4) are respectively parallel to the end faces of two ends of the fifth construction plate (2-5), and the I-shaped limiting sliding plate is parallel to the first construction plate (1-5); one side of each of the first baffle guide rail (2-17) and the second baffle guide rail (2-18) is respectively fixed at two ends of the same side of the first constructional plate (1-5), the first baffle guide rail (2-17) and the second baffle guide rail (2-18) are parallel to each other and are vertical to the first constructional plate (1-5), and the first baffle guide rail (2-17) is matched with the second baffle guide rail (2-18); the first baffle guide rail (2-17) is provided with a first guide rail groove (2-19) matched with the fifth slide block (2-3), the second baffle guide rail (2-18) is provided with a second guide rail groove (2-20) matched with the fifth slide block (2-3), and the I-shaped limiting slide plate can respectively slide in the first guide rail groove (2-19) and the second guide rail groove (2-20) through the fifth slide block (2-3) and the sixth slide block (2-4) to form synchronous motion parallel to the first constructional plate (1-5); the pi-shaped limiting plate is composed of a third baffle (2-7), a seventh sliding block and an eighth sliding block, wherein the seventh sliding block comprises a seventh body (2-12) with a rectangular cross section, a sixth bulge (2-13) arranged in the middle of the seventh body (2-12) and a first limiting sliding plate (2-11) arranged below the seventh body (2-12); the eighth sliding block comprises an eighth body (2-15) with a rectangular cross section, a seventh bulge (2-16) arranged in the middle of the eighth body (2-15) and a second limiting sliding plate (2-14) arranged below the eighth body (2-15); the third baffle (2-7) comprises a fifth groove body (2-21) for accommodating the seventh body (2-12) and the eighth body (2-15) and a fifth notch (2-9) for the sixth bulge (2-13) and the seventh bulge (2-16) to penetrate through, and the fifth notch (2-9) is arranged in the middle of the upper surface of the fifth groove body (2-21) and is opened upwards; the third baffle (2-7) also comprises a sixth notch (2-10) for the first limiting sliding plate (2-11) and the second limiting sliding plate (2-14) to penetrate through, and the sixth notch (2-10) is opened downwards; the first limiting sliding plate (2-11) and the second limiting sliding plate (2-14) are respectively provided with a first limiting through groove (2-22) and a second limiting through groove (2-23) for the first locating rod (3-13) and the second locating rod (3-14) to penetrate through, the first locating rod (3-13) and the second locating rod (3-14) are respectively matched with the first limiting through groove (2-22) and the second limiting through groove (2-23), and the first locating rod (3-13) and the second locating rod (3-14) are kept in a parallel state through the first limiting through groove (2-22) of the seventh sliding block and the second limiting through groove (2-23) of the eighth sliding block; the third baffle (2-7) is parallel to the second constructional plate (1-4) along the length direction; a fifth bulge (2-8) is arranged on the side surface of the third baffle (2-7), a first limiting groove (1-13) capable of fixing the fifth bulge (2-8) is arranged on the second construction plate (1-4), and the first limiting groove (1-13) is matched with the fifth bulge (2-8); a second limiting groove (2-2) matched with the fifth bulge (2-8) is formed in the side, away from the second structural plate (1-4), of the sixth structural plate (2-1), and the second limiting groove (2-2) is matched with the fifth bulge (2-8); the third baffle (2-7) is detachably fixed on the second structural plate (1-4) or the sixth structural plate (2-1), and the first positioning rod (3-13) and the second positioning rod (3-14) are ensured to respectively penetrate through the first limiting through groove (2-22) of the seventh sliding block and the second limiting through groove (2-23) of the eighth sliding block in a horizontal state;

the shell (1-10) is hollow, the first supporting mechanism, the first sliding guide rail (3-7) and the second sliding guide rail (3-6) connected with the first supporting mechanism, the second supporting mechanism, the third sliding guide rail (4-7) and the fourth sliding guide rail (4-6) connected with the second supporting mechanism are uniformly distributed in the shell (1-10), the shell (1-10) is perpendicular to the first positioning rod (3-13) and close to a side opening of the side surface of the first positioning rod (3-13), a first reserved hole (1-2) and a second reserved hole (1-3) are arranged on the side panel (1-1) corresponding to the opposite surface of the opening side, and the first positioning shaft (3-12) and the second positioning shaft (4-12) respectively penetrate through the first reserved hole (1-2) and the second reserved hole (1-2) Holes (1-3) are reserved and matched with the first reserved holes (1-2) and the second reserved holes (1-3); the first knob (3-10) and the second knob (4-10) are respectively arranged on the first positioning shaft (3-12) and the second positioning shaft (4-12) and are positioned outside the side panel (1-1), the first limiting sheet (3-11) is arranged between the inner side of the side panel (1-1) and the first rolling gear (3-1), the second limiting sheet (4-11) is arranged between the inner side of the side panel (1-1) and the second rolling gear (4-1), and the distance between the first limiting sheet (3-11) and the side panel (1-1) is less than the width of the first rolling gear (3-1), the distance between the second limiting sheet (4-11) and the side panel (1-1) is less than the width of the second rolling gear (4-1);

the maximum moving distance between the third positioning rod (4-13) and the fourth positioning rod (4-14) is at least larger than the diameter of a working table (6) of the universal testing machine;

the distance between the first baffle guide rail (2-17) and the second baffle guide rail (2-18) is slightly smaller than the diameter of the workbench (6) of the universal testing machine;

the maximum distance between the first positioning rods (3-13) and the second positioning rods (3-14) is matched with the size of the I-shaped limiting sliding plate.