CN115078084A - Steel bar prestress detection device with stretch-proofing and deformation-resisting strength detection functions - Google Patents

Abstract

The invention discloses a steel bar prestress detection device with both tensile strength and anti-deformation strength detection. The hollow tube is fixedly connected, and the present invention uses the mutual cooperation between the second servo motor, the transmission gear, the driven gear, the transmission rod, the rotating rod, the winding roller, the wire rope, the square rod, the square tube, the ring and the hook, And observe the applied pulling force through the gravity dial indicator, so as to achieve the purpose of detecting the anti-deformation strength of the steel bar, and through the interaction between the side plate, the second threaded block, the second threaded rod, the first servo motor, the rotating rod and the transmission belt. The tensile strength of the steel bar can be detected by pulling the right side plate to move, so that the tensile strength detection and the deformation resistance detection can be carried out in one device, which not only improves the detection efficiency, but also reduces the detection time. cost.

Description

A kind of steel prestress detection with both tensile and anti-deformation strength detection device

technical field

The invention relates to the technical field of steel bar prestress detection, in particular to a steel bar prestress detection device with both tensile strength and deformation resistance strength detection.

Background technique

Prestressed reinforcement is the compressive stress applied to the concrete of the component by the pre-tensioning method or the post-tensioning method before the structural member is used. In reinforced concrete structures, there will be cracks in the components under tension. Although it does not affect the safety, it does not look good. After the steel bars are produced, it is necessary to sample the quality of the steel bars, such as testing the tensile strength and deformation strength of the steel bars.

When testing the tensile strength and deformation resistance of steel bars in the existing steel prestress testing device, the testing is usually carried out in two different devices, which not only reduces the testing efficiency but also increases the cost of use. Some steel prestress detection devices are too cumbersome and time-consuming when fixing steel bars.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to overcome the defects of the prior art, and to provide a steel bar prestress detection device with both tensile strength and deformation resistance strength detection.

In order to achieve the above purpose, the present invention provides the following technical solutions: a steel bar prestress detection device with both tensile strength and anti-deformation strength detection, including a workbench, the top of the workbench is fixedly connected with a support column near the left side , and the top of the support column is fixedly connected with a hollow tube, the inner cavity of the hollow tube is provided with a clamping mechanism, and the left and right sides of the support column are provided with side plates, which are located on the side of the left side. The bottom of the plate is fixedly connected with the top of the workbench, the bottom of the side plate on the right side is provided with a traction mechanism, and the two side plates are provided with a first slot near the top, and the first slot is opened. A sleeve is arranged on the top of the inner cavity of the groove, a stretching mechanism is jointly arranged between the two sleeves, and a slider is fixedly connected to the front and rear sides of the two sleeves. A chute is provided on both the front and rear sides of the cavity, and a plurality of the sliding blocks are respectively movably connected to the inner cavity of the adjacent chute.

Preferably, the clamping mechanism includes two annular plates, and the two annular plates are respectively located in the inner cavity of the hollow tube near the left and right sides, and the two annular plates are hinged on one side away from each other. A connecting rod is hinged at one end of the arc-shaped rod away from the adjacent annular plate, one end of the connecting rods is hinged with the inner side wall of the hollow tube, and the other connecting rods are hinged with the inner wall of the hollow tube. A ball is fixedly connected at one end, a vertical plate is fixedly connected to the top of the hollow tube near the left and right sides, and a first bearing is fixedly connected to the vertical plate, and a first bearing is fixedly connected between the two vertical plates. Two first threaded blocks, and the two first threaded blocks are arranged on the left and right sides, the two first threaded blocks are both provided with first threaded holes, and the inner cavity of the two first threaded holes has opposite thread directions , the two first threaded hole cavities are provided with a first threaded rod, the left end of the first threaded rod is inserted into the adjacent first bearing cavity, and the right end of the first threaded rod passes through the corresponding Adjacent to the inner cavity of the first bearing, and fixedly connected with a hand wheel, the bottoms of the two first threaded blocks are fixedly connected with vertical rods, and the top of the hollow tube is provided with a second opening that matches with the vertical rods. The bottom ends of the two vertical rods pass through the second slotted inner cavity and are respectively fixedly connected with the tops of the adjacent annular plates.

Preferably, the traction mechanism includes a limit block, and the limit block is fixedly connected at the bottom middle position of the side plate on the right side, a cavity is opened on the worktable near the right side, and the The top of the cavity is provided with a third slot, the bottom of the limiting block penetrates through the third slot cavity, extends to the cavity cavity, and is fixedly connected with a second threaded block, which is provided with a second threaded block. There is a second threaded hole, and the inner cavity of the second threaded hole is provided with a second threaded rod, the left and right sides of the inner cavity of the cavity are fixedly connected with a second bearing, and the second threaded rod is The left and right ends are respectively inserted into the adjacent second bearing inner cavity.

Preferably, a first servo motor is fixedly connected to the top right side of the workbench, and a rotating rod is fixedly connected to the power output end of the first servo motor, and a rotating rod is provided between the rotating rod and the second threaded rod. For the transmission belt, the top of the cavity is provided with a through hole matching with the transmission belt at the right side, and the rotating rod and the second threaded rod are connected by the transmission belt.

Preferably, the stretching mechanism includes two gravity dial indicators, and the two gravity dial indicators are respectively fixedly connected to the adjacent sides of the bottoms of the two sleeves, and the bottoms of the two gravity dial indicators are respectively Both are movably connected with hooks, and the hooks are movably connected with rings, the bottoms of the two rings are fixedly connected with steel wire ropes, and the adjacent sides of the two side plates are provided with winding rollers near the bottom. , and there is a rotating rod running through the winding roller, a third bearing is fixedly connected to the adjacent sides of the two side plates near the bottom, and the ends of the two rotating rods that are far away from each other are respectively inserted in the corresponding In the inner cavity of the adjacent third bearing, the ends of the two wire ropes away from the adjacent rings are respectively fixedly connected with the adjacent winding rollers, and the right end of the rotating rod on the left side is fixedly connected with a transmission rod. A first perforation is opened on the column near the bottom, and the right end of the transmission rod penetrates the inner cavity of the first perforation, and is fixedly connected with a square rod, the outer side of the square rod is sleeved with a square tube, and the square tube is The right end is fixedly connected with a connecting plate, the right side of the connecting plate is fixedly connected with the left end of the rotating rod located on the right side, the left side of the supporting column is fixedly connected with a second servo motor near the bottom, and the second servo motor The power output end of the motor is fixedly connected with a transmission gear, the bottom of the transmission gear is meshed with a driven gear, and the driven gear is sleeved on the outer side of the transmission rod near the left end.

Preferably, a second through hole is opened at the top middle position of the two side plates, and a T-shaped rod is formed through the inner cavity of the second through-hole, and the longer end of the T-shaped structure of the two T-shaped rods They are respectively fixedly connected with the tops of the adjacent sleeves, the outer sides of the two T-shaped rods are sleeved with springs, and the upper and lower ends of the springs are respectively fixedly connected with the T-shaped rods and the side plates.

Preferably, an L-shaped plate is fixedly connected to the middle position of the top of the two sleeves, and an electric push rod is fixedly connected to the bottom of the L-shaped plate, and the adjacent sides of the top of the two sleeves are A third perforation is opened, the power ends of the two electric push rods respectively penetrate through the inner cavity of the adjacent third perforation, and are fixedly connected with a pressure plate, and the bottoms of the two pressure plates are fixedly connected with a rubber pad.

Preferably, a plurality of the spherical spheres on the same side are arranged in an annular array with the center of the hollow tube as the center, and the two annular plates are arranged symmetrically on the left and right with the center axis of the hollow tube as the symmetry axis.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention uses the mutual cooperation between the second servo motor, the transmission gear, the driven gear, the transmission rod, the rotating rod, the winding roller, the wire rope, the square rod, the square tube, the ring and the hook, and through the percentage of gravity Watch the applied tensile force, so as to achieve the purpose of detecting the anti-deformation strength of the steel bar, and through the mutual cooperation between the side plate, the second threaded block, the second threaded rod, the first servo motor, the rotating rod and the transmission belt, pull the right side The side plate of the steel bar is moved to detect the tensile strength of the steel bar, so that the tensile resistance detection and the deformation resistance detection can be carried out in one device, which not only improves the detection efficiency, but also reduces the detection cost;

2. In the present invention, through the mutual cooperation between the hand wheel, the first threaded rod, the first threaded block, the vertical rod, the annular plate, the arc rod, the connecting rod and the ball, it can quickly detect the deformation of the steel bar. The steel bars are clamped and fixed, and the operation is simple and convenient, saving time and effort.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the right side view of the component side plate of the present invention;

Fig. 3 is the right side view of the hollow tube of the component of the present invention;

FIG. 4 is an enlarged view of A in FIG. 1 .

Labels in the figure: 1, workbench; 2, support column; 3, hollow tube; 4, side plate; 5, sleeve; 6, T-bar; 7, spring; 8, electric push rod; 9, pressure plate; 10. Rubber pad; 11. Gravity dial indicator; 12. Hook; 13. Ring; 14. Steel wire rope; 15. Winding roller; 16. Rotating rod; 17. Transmission rod; 18. Driven gear; 19. Transmission Gear; 20, second servo motor; 21, connecting plate; 22, square tube; 23, square rod; 24, first threaded block; 25, first threaded rod; 26, hand wheel; 27, second threaded block ; 28, the second threaded rod; 29, the first servo motor; 30, the rotating rod; 31, the transmission belt; 32, the connecting rod; 33, the ball;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-4, the present invention provides a technical solution: a steel bar prestress detection device with both tensile and deformation resistance strength detection, including a workbench 1, the top of the workbench 1 is fixedly connected near the left side There is a support column 2, and a hollow tube 3 is fixedly connected to the top of the support column 2. The inner cavity of the hollow tube 3 is provided with a clamping mechanism, and the left and right sides of the support column 2 are provided with side plates 4. The bottom of the side plate 4 is fixedly connected with the top of the workbench 1, the bottom of the side plate 4 on the right is provided with a traction mechanism, and the two side plates 4 are provided with a first slot near the top, and the first slot is The top of the inner cavity is provided with a sleeve 5, a stretching mechanism is jointly arranged between the two sleeves 5, and an L-shaped plate is fixedly connected to the middle position of the top of the two sleeves 5, and the bottom of the L-shaped plate is fixedly connected with an L-shaped plate. In the electric push rod 8, a third perforation is provided on the adjacent side of the top of the two sleeves 5, and the power ends of the two electric push rods 8 respectively penetrate the adjacent third perforated inner cavity, and are fixedly connected with a pressure plate 9 , the bottoms of the two pressure plates 9 are fixedly connected with rubber pads 10, which are convenient for pressing and fixing the two ends of the steel bars, the front and rear sides of the two sleeves 5 are fixedly connected with sliders, and the front and rear of the two first slotted cavities are Both sides are provided with chute, and several sliders are respectively movably connected to the inner cavity of the adjacent chute.

The clamping mechanism includes two annular plates 35, and the two annular plates 35 are respectively located in the inner cavity of the hollow tube 3 near the left and right sides, and a plurality of arc-shaped rods 34 are hinged on the side away from the two annular plates 35. , and one end of the arc-shaped rod 34 away from the adjacent annular plate 35 is hinged with a connecting rod 32, one end of several connecting rods 32 is hinged with the inner side wall of the hollow tube 3, and the other ends of several connecting rods 32 are fixedly connected There are spherical balls 33, and several spherical balls 33 on the same side are arranged in a circular array with the center of the hollow tube 3 as the center. Vertical plates are fixedly connected to the top of the hollow tube 3 near the left and right sides, and a first bearing is fixedly connected to the vertical plates. Two first threaded blocks 24 are arranged between the two vertical plates, and the two first The threaded blocks 24 are arranged on the left and right sides, the two first threaded blocks 24 are both provided with first threaded holes, the inner cavities of the two first threaded holes have opposite thread directions, and the inner cavities of the two first threaded holes are jointly provided with first threads Rod 25, the left end of the first threaded rod 25 is inserted into the inner cavity of the adjacent first bearing, and the right end of the first threaded rod 25 penetrates the inner cavity of the adjacent first bearing, and is fixedly connected with a hand wheel 26, two Nos. A vertical rod is fixedly connected to the bottom of a threaded block 24, the top of the hollow tube 3 is provided with a second slot matching with the vertical rod, and the bottom ends of the two vertical rods penetrate through the inner cavity of the second slot, respectively It is fixedly connected with the top of the adjacent annular plate 35, which is convenient for fast fixing of steel bars, saving time and effort.

The traction mechanism includes a limit block, and the limit block is fixedly connected at the bottom middle position of the side plate 4 on the right side. A cavity is opened on the workbench 1 near the right side, and a third opening is opened on the top of the cavity. The bottom of the limit block penetrates the third slotted cavity, extends to the cavity cavity, and is fixedly connected with a second threaded block 27. The second threaded block 27 is provided with a second threaded hole, and the second threaded hole The inner cavity is provided with a second threaded rod 28, the left and right sides of the inner cavity of the cavity are fixedly connected with a second bearing, and the left and right ends of the second threaded rod 28 are respectively inserted into the adjacent second bearings In the inner cavity, a first servo motor 29 is fixedly connected to the top right side of the workbench 1 , and a rotating rod 30 is fixedly connected to the power output end of the first servo motor 29 , and a rotating rod 30 and the second threaded rod 28 are provided with In the transmission belt 31, a through hole matching the transmission belt 31 is provided at the top of the cavity near the right side, and the rotating rod 30 and the second threaded rod 28 are connected by the transmission belt 31, which is convenient for the tensile strength test of the steel bar.

The stretching mechanism includes two gravity dial indicators 11, and the two gravity dial indicators 11 are respectively fixedly connected to the adjacent sides of the bottom of the two sleeves 5, and the bottoms of the two gravity dial indicators 11 are movably connected with hooks. 12, and the hook 12 is movably connected with a ring 13, the bottoms of the two rings 13 are fixedly connected with wire ropes 14, and the adjacent sides of the two side plates 4 are provided with winding rollers 15 near the bottom. The roller 15 is provided with a rotating rod 16, a third bearing is fixedly connected to the adjacent sides of the two side plates 4 near the bottom, and the ends of the two rotating rods 16 that are far away from each other are respectively inserted into the adjacent third bearings. Cavity, one end of the two wire ropes 14 away from the adjacent ring 13 is respectively fixedly connected with the adjacent winding roller 15, the right end of the rotating rod 16 on the left is fixedly connected with a transmission rod 17, and the support column 2 is opened near the bottom. There is a first perforation, and the right end of the transmission rod 17 penetrates through the inner cavity of the first perforation, and is fixedly connected with a square rod 23, the outer side of the square rod 23 is sleeved with a square tube 22, and the right end of the square tube 22 is fixedly connected with a connecting plate 21 , the right side of the connecting plate 21 is fixedly connected with the left end of the rotating rod 16 located on the right side, the left side of the support column 2 is fixedly connected with the second servo motor 20 near the bottom, and the power output end of the second servo motor 20 is fixedly connected There is a transmission gear 19, the bottom of the transmission gear 19 is meshed with a driven gear 18, and the driven gear 18 is sleeved on the outer side of the transmission rod 17 near the left end, and the middle position of the top of the two side plates 4 is provided with a second perforation , and the second perforated inner cavity is provided with a T-shaped rod 6, the longer ends of the T-shaped structures of the two T-shaped rods 6 are respectively fixedly connected with the top of the adjacent sleeve 5, and the outer sides of the two T-shaped rods 6 are sleeved. There is a spring 7, and the upper and lower ends of the spring 7 are fixedly connected with the T-bar 6 and the side plate 4 respectively, so as to facilitate the detection of the anti-deformation strength of the steel bar.

Working principle: When the present invention is in use, when the anti-deformation detection of the steel bar is performed, one end of the steel bar is penetrated from the inner cavity of the hollow tube 3, and the two ends of the steel bar are respectively penetrated from the inner cavity of the two sleeves 5. Go out, drive the first threaded rod 25 to rotate by rotating the hand wheel 26, the first threaded rod 25 rotates and drives the two first threaded blocks 24 away from each other, and the two first threaded blocks 24 move away from each other through the two vertical rods. The annular plates 35 move away from each other, and the distance between the two annular plates 35 pushes the adjacent arc rods 34 to move away from the inner cavity of the hollow tube 3, and drives a number of circles through the arrangement of several connecting rods 32. The ball 33 is close to the steel bar, clamps and fixes the steel bar, and simultaneously starts the two electric push rods 8. The electric push rod 8 works to push the pressing plate 9 to move down, and drives the rubber pad 10 to press the two ends of the steel bar, thereby compressing the two ends of the steel bar. The second servo motor 20 is started by an external power supply, the second servo motor 20 works to drive the transmission gear 19 to rotate, the transmission gear 19 rotates to drive the driven gear 18 to rotate, and the driven gear 18 rotates to drive the transmission rod 17 to rotate, The rotation of the transmission rod 17 drives the left rotation rod 16 and the square rod 23 to rotate at the same time, the rotation of the left rotation rod 16 drives the adjacent winding rollers 15 to rotate, and shrinks the wire rope 14, and the square rod 23 rotates through the square tube 22. The socket connection drives the right rotating rod 16 and the winding roller 15 to rotate at the same time, and also shrinks the wire rope 14. The two wire ropes 14 shrink and pull the two rings 13 to move down at the same time, and pull the gravity dial indicator 11 through the hook 12. Move down with the sleeve 5, and you can visually observe the pulling force of the applied force through the gravity dial indicator 11. After reaching the detection standard, stop applying pressure. At this time, if the steel bar is bent, it is unqualified, and if there is no change, it is qualified. When testing the tensile strength of the steel bar, the two ends of the steel bar are also passed through the inner cavities of the two sleeves 5 respectively. There is no need to turn the hand wheel 26 to clamp and fix the middle of the steel bar. Just start two electric pushers. The rod 8 clamps and fixes both ends of the steel bar, and activates the first servo motor 29 through an external power supply. The first servo motor 29 works to drive the rotating rod 30 to rotate, and the rotating rod 30 drives the second threaded rod 28 to rotate through the transmission belt 31. The rotation of the second threaded rod 28 drives the second threaded block 27 to move to the right, and drives the right side plate 4 to move to the right, thereby stretching the steel bars. After the distance, the traction force is stopped. By analyzing and judging the data of the steel bar after stretching, the purpose of testing the tensile strength of the steel bar can be achieved. This device can perform both deformation resistance and tensile strength testing. The detection efficiency is improved while the detection cost is reduced.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a have stretching-resistant and anti deformation strength detection's reinforcing bar prestressing force detection device simultaneously, includes workstation (1), its characterized in that: a supporting column (2) is fixedly connected to the top of the workbench (1) near the left side, the top end of the supporting column (2) is fixedly connected with a hollow tube (3), the inner cavity of the hollow tube (3) is provided with a clamping mechanism, the left side and the right side of the supporting column (2) are both provided with side plates (4), the bottom of the side plate (4) positioned on the left side is fixedly connected with the top of the workbench (1), the bottom of the side plate (4) positioned on the right side is provided with a traction mechanism, the positions of the two side plates (4) close to the top are both provided with first slots, and sleeve (5) are arranged at the top of the first slotted inner cavity, a stretching mechanism is arranged between the sleeves (5), two sliding blocks are fixedly connected to the front side and the rear side of each sleeve (5), sliding grooves are formed in the front side and the rear side of the first slotted inner cavity, and the sliding blocks are movably connected to the adjacent sliding groove inner cavities respectively.

2. The device for testing the prestress of the steel bar according to claim 1, wherein the device comprises: the clamping mechanism comprises two annular plates (35), the two annular plates (35) are respectively positioned at the positions, close to the left side and the right side, of an inner cavity of the hollow pipe (3), one side, far away from the two annular plates (35), of each annular plate is hinged with a plurality of arc-shaped rods (34), one end, far away from the adjacent annular plate (35), of each arc-shaped rod (34) is hinged with a connecting rod (32), one end of each connecting rod (32) is hinged with the inner side wall of the hollow pipe (3), the other end of each connecting rod (32) is fixedly connected with a round ball (33), the positions, close to the left side and the right side, of the top of the hollow pipe (3) are fixedly connected with vertical plates, first bearings are fixedly connected onto the vertical plates, two first thread blocks (24) are arranged between the two vertical plates, the two first thread blocks (24) are arranged leftwards and rightwards, and first thread holes are formed in the two first thread blocks (24), two first screw hole inner chamber screw thread opposite direction, two first screw hole inner chamber runs through jointly and is equipped with first threaded rod (25), peg graft at adjacent first bearing inner chamber at the left end of first threaded rod (25), just the right-hand member of first threaded rod (25) runs through adjacent first bearing inner chamber to the hand wheel of fixedly connected with (26), two the equal fixedly connected with montant in bottom of first thread piece (24), the second fluting that matches each other with the montant is seted up at the top of hollow tube (3), two the second fluting inner chamber is all run through to the bottom of montant to respectively with adjacent annular slab (35) top fixed connection.

3. The device for testing the prestress of the steel bar according to claim 1, wherein the device comprises: the traction mechanism comprises a limiting block, the limiting block is fixedly connected to the middle position of the bottom of a side plate (4) on the right side, a cavity is formed in the position, close to the right side, of the workbench (1), a third groove is formed in the top of the cavity, the bottom of the limiting block penetrates through the inner cavity of the third groove and extends to the inner cavity of the cavity, and a second threaded block (27) is fixedly connected with the bottom of the limiting block, a second threaded hole is formed in the second threaded block (27), a second threaded rod (28) penetrates through the inner cavity of the second threaded hole, second bearings are fixedly connected to the left side and the right side of the inner cavity of the cavity, and the left end and the right end of the second threaded rod (28) are respectively connected with adjacent second bearing inner cavities in an inserting mode.

4. The device for testing the prestress of the steel bar according to claim 3, wherein the device comprises: the top right side department fixedly connected with first servo motor (29) of workstation (1), just the power take off end fixedly connected with bull stick (30) of first servo motor (29), be equipped with between bull stick (30) and second threaded rod (28) drive belt (31), the top of cavity is close to right side department and is seted up the through-hole that matches each other with drive belt (31), be connected through drive belt (31) transmission between bull stick (30) and second threaded rod (28).

5. The device for testing the prestress of the steel bar according to claim 1, wherein the device comprises: the drawing mechanism comprises two gravity percentage meters (11), the two gravity percentage meters (11) are respectively and fixedly connected to one side of the adjacent bottoms of the two sleeves (5), the bottoms of the two gravity percentage meters (11) are respectively and movably connected with a hook (12), a ring (13) is movably connected onto the hook (12), steel wire ropes (14) are respectively and fixedly connected to the bottoms of the two rings (13), winding rollers (15) are respectively arranged at the positions, close to the bottoms, of the adjacent sides of the two side plates (4), rotating rods (16) are arranged on the winding rollers (15) in a penetrating manner, third bearings are respectively and fixedly connected to the positions, close to the bottoms, of the adjacent sides of the two side plates (4), one ends, far away from the rotating rods (16), are respectively inserted into the inner cavities of the adjacent third bearings, and one ends, far away from the adjacent rings (13), of the two steel wire ropes (14) are respectively and fixedly connected with the adjacent winding rollers (15), a transmission rod (17) is fixedly connected at the right end of the rotating rod (16) positioned at the left side, a first through hole is arranged on the supporting column (2) near the bottom, the right end of the transmission rod (17) penetrates through the inner cavity of the first through hole, and is fixedly connected with a square bar (23), a square tube (22) is sleeved outside the square bar (23), and the right end of the square tube (22) is fixedly connected with a connecting plate (21), the right side of the connecting plate (21) is fixedly connected with the left end of a rotating rod (16) positioned at the right side, a second servo motor (20) is fixedly connected at the left side of the supporting column (2) close to the bottom, a power output end of the second servo motor (20) is fixedly connected with a transmission gear (19), the bottom of the transmission gear (19) is engaged with a driven gear (18), and the driven gear (18) is sleeved at the outer side of the transmission rod (17) close to the left end.

6. The device for testing the prestress of the steel bar according to claim 1, wherein the device comprises: two the second perforation has all been seted up to the top intermediate position department of curb plate (4), just the second perforation inner chamber runs through and is equipped with T shape pole (6), two the longer one end of T shape pole (6) T shape structure respectively with adjacent sleeve (5) top fixed connection, two the outside of T shape pole (6) all is overlapped and is equipped with spring (7), just the upper and lower both ends of spring (7) respectively with T shape pole (6) and curb plate (4) fixed connection.

7. The device for testing the prestress of the steel bar according to claim 1, wherein the device comprises: two equal fixedly connected with L shaped plate in top intermediate position department of sleeve (5), just the bottom fixedly connected with electric putter (8) of L shaped plate, two the third perforation has all been seted up to the adjacent one side in top of sleeve (5), two the power end of electric putter (8) runs through adjacent third perforation inner chamber respectively to equal fixedly connected with clamp plate (9), two the equal fixedly connected with rubber pad (10) in bottom of clamp plate (9).

8. The device for testing the prestress of the steel bar according to claim 2, wherein the device is characterized in that: the round balls (33) positioned on the same side are arranged in an annular array shape by taking the circle center of the hollow pipe (3) as the center, and the two annular plates (35) are arranged in a bilateral symmetry manner by taking the central axis of the hollow pipe (3) as a symmetry axis.

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