Bridge steel strand tensile strength detection device

Abstract

The invention relates to the field of steel strand detection, and particularly discloses a bridge steel strand tensile strength detection device which comprises a rack and a steel strand body, a detection mechanism is arranged on the rack and comprises a base arranged at the top of the rack, and carrying tables are arranged at the two ends of the base respectively. Wherein a tension sensor is fixedly arranged on one side of one carrying table, a positioning seat is arranged at the upper end of the carrying table, the positioning seat on the carrying table corresponding to the tension sensor is slidably connected to the upper end of the carrying table, and one side of the positioning seat is in bolted connection with one end of the tension sensor. According to the bridge steel strand tensile strength detection device, the detection mechanism, the clamping mechanism and the protection mechanism share the driving mechanism and the guiding mechanism, when the detection mechanism descends to the bottom of the protection mechanism, closing of the protection mechanism and clamping of a steel strand body by the clamping mechanism can be automatically achieved, the structure is compact, one-step operation is achieved, and the detection efficiency is improved. And the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of steel strand detection, and in particular to a bridge steel strand tensile strength detection device. Background Art

[0002] As a high-strength building material, bridge steel strands are widely used in bridges and other projects, and play an important role in bearing. Their quality directly affects the safety and durability of bridge structures. Therefore, it is crucial to test the tensile strength of bridge steel strands. Through testing, potential quality problems can be discovered in time, accidents can be prevented, and the service life and safety of bridges can be ensured.

[0003] However, in the existing detection technology, there are some problems with the tensile strength detection device of bridge steel strands. First, the steel strands are made of twisted steel wires, and it is time-consuming and laborious to fix and clamp the two ends, which greatly reduces the detection efficiency. The traditional fixing method may require multiple manual adjustments and confirmations to ensure the stability and safety of the steel strands.

[0004] Secondly, although the detection devices in the prior art have taken safety into consideration, they still have some shortcomings. In order to increase the safety during detection, a protective structure is generally set. However, these protective structures often need to be opened and closed manually, which is cumbersome and inconvenient. This not only increases the labor intensity of the operator, but also may cause safety hazards due to human factors.

[0005] Therefore, it is necessary to propose a bridge steel strand tensile strength detection device to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a bridge steel strand tensile strength detection device, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A bridge steel strand tensile strength detection device comprises a frame and a steel strand body, the frame is provided with a detection mechanism, the detection mechanism comprises a base arranged on the top of the frame, two ends of the base are respectively provided with platforms, one side of one of the platforms is fixedly provided with a tension sensor, the upper end of the platform is provided with a positioning seat, and the positioning seat on the platform corresponding to the tension sensor is slidably connected to the upper end of the platform, and one side of the positioning seat is bolted to one end of the tension sensor, the positioning seat on the platform away from the tension sensor is fixedly provided at the upper end of the platform, the positioning seat is provided with a clamping mechanism for fixing the end of the steel strand body, and one end of the top of the base is provided with a second driving source for driving the platform corresponding to the tension sensor to move; The clamping mechanism comprises clamping blocks slidably connected to the two ends of the positioning seat, and the two clamping blocks are fixedly provided with a cross arm for pushing the clamping blocks to move on the opposite sides; The upper end of the frame is provided with a protective mechanism, the protective mechanism includes a hood provided on the top of the frame for covering the detection mechanism, the top of the hood is provided with an entrance and exit for the detection mechanism to enter and exit, and protective plates for covering the entrance and exit are symmetrically slidably connected on both sides of the top of the inner cavity of the hood; The bottom of the base is provided with a driving mechanism for driving the base to rise and fall; The cam is an angular channel formed on a pair of camshafts, the channel having a first end, a second end, and a second end, wherein the camshaft is arranged on a track and the track is moved along the track in a direction opposite to the track.

[0008] Preferably, the driving mechanism includes screws rotatably arranged at both ends of the inner cavity of the hood, and the two ends of the base are respectively engaged with the two screw threads, the lower end of the screw extends to the inner side of the frame and is provided with a synchronous wheel, and a synchronous belt is commonly provided on the two synchronous wheels, and a first driving source for driving one of the screws to rotate is provided at one end of the inner side of the frame.

[0009] Preferably, a first guide wheel is rotatably provided at one end of the cross arm away from the clamping block, and the end of the cross arm is movably guided and matched with the vertical groove and the second guide groove through the first guide wheel; A ball is movably provided at one end of the first guide wheel away from the cross arm.

[0010] Preferably, the hood is provided with a loosening and resetting mechanism for loosening the two ends of the steel strand body, the loosening and resetting mechanism comprises a transverse groove transversely arranged at the lower end of the second guide groove, the second guide groove is provided with a second guide slope at one end close to the transverse groove, and the second guide slope smoothly transitions with the transverse groove and the inner wall of the second guide groove, and the end of the cross arm cooperates with the transverse groove movable guide through the first guide wheel; The upper end of the positioning seat is provided with a second slide groove, and the inner two ends of the second slide groove are symmetrically slidably connected with second sliders corresponding to the clamping block, the top of the second slider is fixedly connected to the bottom of the clamping block, a spring is provided between the two second sliders, a second guide rod is provided inside the second slide groove, and the second slider is movably sleeved on the outer side of the second guide rod; The two ends of the top of the base are symmetrically provided with first sliding grooves, and a second sliding block corresponding to the carrier is slidably connected to the inner side of the first sliding groove, and the top of the second sliding block is fixedly connected to the bottom of the carrier, a first guide rod is provided on the inner side of the first sliding groove, and the second sliding block is movably sleeved on the outer side of the first guide rod, and a mounting groove is provided on the side of the base, and rack plates are slidably connected to the upper and lower ends of the mounting groove, and a gear located between the two rack plates is rotatably provided in the middle part of the inner side of the mounting groove, and the gear is meshed with the rack plate, and the side walls of the two rack plates in the same mounting groove that are away from each other are respectively fixedly connected to the side walls of the two second sliding blocks.

[0011] Preferably, an "L"-shaped discharge arm is provided at the end of the base, the upper end of the discharge arm corresponds to the gap between the two clamping blocks, and the side of the upper end of the discharge arm close to the clamping block is in a pointed cone shape.

[0012] Preferably, arc-shaped clamping blocks are provided on opposite sides of the two clamping blocks on the same positioning seat, arc-shaped clamping grooves are provided between adjacent arc-shaped clamping blocks, and the arc-shaped clamping block on one clamping block corresponds to the arc-shaped clamping groove on the other clamping block.

[0013] Preferably, the arc-shaped clamping block is slidably matched with the side of the clamping block, and an installation cavity is provided on the side of the clamping block close to the arc-shaped clamping block. A driving arm is slidably connected to the inner side of the positioning seat, and one end of the driving arm is fixedly connected to the side of the arc-shaped clamping block close to the clamping block. A secondary clamping block corresponding to the installation cavity is movably connected to the side of the clamping block close to the arc-shaped clamping groove, and the inner end of the secondary clamping block is matched with the inclined surface of one end of the driving arm.

[0014] Preferably, guide pillars are vertically arranged at both ends of the inner side of the hood, and the ends of the base are movably connected to the guide pillars.

[0015] Preferably, the second driving source is a hydraulic cylinder; The first driving source is a reduction motor.

[0016] Preferably, the end of the protective plate and the top of the hood are both provided with avoidance grooves corresponding to the cross arms.

[0017] Compared with the prior art, the present invention provides a bridge steel strand tensile strength detection device, which has the following beneficial effects: 1. The bridge steel strand tensile strength detection device uses a common driving mechanism and a guiding mechanism through the detection mechanism, the clamping mechanism and the protective mechanism. When the detection mechanism descends to the bottom of the protective mechanism, the protective mechanism can be automatically closed and the clamping mechanism can clamp the steel strand body. The structure is compact, one-step, easy to use, and improves the detection efficiency. The setting of the loosening and resetting mechanism can loosen the steel strand body after the fracture is detected. The unloading arm can push the steel strand body out from between the clamping blocks for easy removal. The structure is linked and easy to use.

[0018] 2. The bridge steel strand tensile strength testing device can increase the degree of fixation of the clamping block to the steel strand body and increase the contact area by means of the arc-shaped clamping block and the arc-shaped clamping groove. The coordinated arrangement of the driving arm, the mounting cavity and the secondary clamping block can further reinforce the steel strand body when the steel strand body is subjected to force and is pulled. When the steel strand body is subjected to force, part of the force will be applied to the arc-shaped clamping block, so that the arc-shaped clamping block has a tendency to move, and the steel strand body is further reinforced by the secondary clamping block, thereby further increasing the firmness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the protective plate of the present invention in a shielding state; Figure 3 The present invention Figure 1 Schematic diagram of the cross-sectional structure of the hood and frame on the foundation; Figure 4 It is a schematic diagram of the structure of the present invention when the hood and frame are removed; Figure 5 The present invention Figure 4 A structural diagram from another perspective based on the above; Figure 6 The present invention Figure 4 Schematic diagram of the structure with the protective plate and sliding plate on the foundation disassembled; Figure 7 It is a schematic diagram of the structure of the base and the driving mechanism of the present invention in a coordinated state; Figure 8 The present invention Figure 7 Schematic diagram of the structure when the foundation is disassembled; Fig. 9 The present invention Figure 8 A structural diagram from another perspective based on the above; Fig.10 It is a schematic diagram of the structure of the clamping block and the carrier in the disassembled state of the present invention; Fig.11 It is a schematic diagram of the overall structure of the clamp block and the cross arm of the present invention; Fig.12It is a schematic diagram of the cross-sectional structure of the clamp block and the steel strand body of the present invention in a matching state; Fig.13 It is a schematic diagram of the structure of the second guide wheel and the first guide groove of the present invention in a separated state; Fig.14 It is a structural schematic diagram of the sliding plate of the present invention.

[0020] In the figure: 1, machine cover; 2, frame; 3, entrance and exit; 4, steel strand body; 5, carrier; 6, discharge arm; 7, clamping block; 8, protective plate; 9, avoidance groove; 10, first driving source; 11, sliding plate; 12, base; 13, guide column; 14, screw; 15, synchronous belt; 16, synchronous wheel; 17, cross arm; 18, second driving source; 19, installation groove; 20, rack plate; 21, tension sensor; 22, first sliding groove; 23, gear; 24, The first guide rod; 25, the positioning seat; 26, the second slide groove; 27, the first slider; 28, the second guide rod; 29, the first guide wheel; 30, the ball; 31, the second slider; 32, the arc-shaped clamping block; 33, the arc-shaped clamping groove; 34, the secondary clamping block; 35, the mounting cavity; 36, the driving arm; 37, the second guide wheel; 38, the first guide groove; 39, the second guide groove; 40, the vertical groove; 41, the horizontal groove; 42, the first guide slope; 43, the second guide slope; 44, the spring. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figure 1 , Figure 3-Figure 9As shown, a bridge steel strand tensile strength detection device includes a frame 2 and a steel strand body 4, a detection mechanism is arranged on the frame 2, and the detection mechanism includes a base 12 arranged on the top of the frame 2 and capable of being lifted and lowered, a platform 5 is arranged at both ends of the top of the base 12, and first slide grooves 22 are symmetrically arranged at both ends of the top of the base 12, a second slider 31 corresponding to the platform 5 is slidably connected to the inner side of the first slide groove 22, the top of the second slider 31 is fixedly connected to the bottom of the platform 5, a first guide rod 24 is arranged inside the first slide groove 22, and the second slider 31 is movably sleeved on the outer side of the first guide rod 24, and one side of one platform 5 is bolted fixedly. A tension sensor 21 is fixedly provided, a positioning seat 25 is provided at the upper end of the carrier 5, and the positioning seat 25 on the carrier 5 corresponding to the tension sensor 21 is slidably connected to the upper end of the carrier 5, and one side of the positioning seat 25 is bolted to one end of the tension sensor 21, and the positioning seat 25 on the carrier 5 away from the tension sensor 21 is fixedly provided at the upper end of the carrier 5, and a clamping mechanism for fixing the end of the steel strand body 4 is provided on the positioning seat 25, and a second driving source 18 for driving the carrier 5 corresponding to the tension sensor 21 to move is fixedly provided at one end of the top of the base 12 with bolts, and the second driving source 18 is preferably a hydraulic cylinder; like Figure 1 , Figure 3-Figure 4 , Figure 6-Figure 11 As shown, the clamping mechanism includes clamping blocks 7 slidably connected to the two ends of the positioning seat 25, and the opposite sides of the two clamping blocks 7 are fixedly provided with a cross arm 17 for pushing the clamping blocks 7 to move. In order to increase the stability of the clamping block 7, a second slide groove 26 is provided at the upper end of the positioning seat 25, and the inner ends of the second slide groove 26 are symmetrically slidably connected with second sliders 31 corresponding to the clamping blocks 7, the top of the second slider 31 is fixedly connected to the bottom of the clamping block 7, and a second guide rod 28 is provided on the inner side of the second slide groove 26. The second slider 31 is movably sleeved on the outer side of the second guide rod 28. In order to clamp firmly, arc-shaped arc-shaped clamping blocks 32 are provided on the opposite sides of the two clamping blocks 7 on the same positioning seat 25, and an arc-shaped arc-shaped clamping groove 33 is provided between adjacent arc-shaped clamping blocks 32, and the arc-shaped clamping block 32 on one clamping block 7 corresponds to the arc-shaped clamping groove 33 on the other clamping block 7; like Figure 11-Figure 12As shown, in order to further increase the fixing firmness of the clamping block 7 to the steel strand body 4, the arc-shaped clamping block 32 is set to slide with the side of the clamping block 7, and a mounting cavity 35 is set on the side of the clamping block 7 close to the arc-shaped clamping block 32. A driving arm 36 is slidably connected to the inner side of the positioning seat 25, and one end of the driving arm 36 is fixedly connected to the side of the arc-shaped clamping block 32 close to the clamping block 7. A secondary pressing block 34 corresponding to the mounting cavity 35 is movably connected to the side of the clamping block 7 close to the arc-shaped clamping groove 33, and the inner end of the secondary pressing block 34 is matched with the inclined surface of one end of the driving arm 36, and is configured so that when the steel strand body 4 is pulled, the secondary pressing block 34 has a tendency to press the steel strand body 4 outwardly; like Figure 1-Figure 6 As shown, a protective mechanism is provided at the upper end of the frame 2, and the protective mechanism includes a hood 1 provided on the top of the frame 2 for covering the detection mechanism, and an entrance and exit 3 for the detection mechanism to enter and exit is provided on the top of the hood 1. Both sides of the top of the inner cavity of the hood 1 are symmetrically slidably connected with protective plates 8 for covering the entrance and exit 3. Specifically, a linear guide rail can be provided on the top of the inner cavity of the hood 1, and the protective plate 8 is movably connected to the linear guide rail. In order to facilitate the avoidance of the cross arm 17, avoidance grooves 9 corresponding to the cross arm 17 are provided at the ends of the protective plate 8 and the top of the hood 1. like Figure 3-Figure 7 As shown, in order to realize the lifting and lowering of the base 12, a driving mechanism for driving the lifting and lowering of the base 12 is arranged at the bottom of the base 12, and the driving mechanism includes screws 14 rotatably arranged at both ends of the inner cavity of the hood 1, the screws 14 are arranged vertically, and the two ends of the base 12 are respectively threadedly matched with the two screws 14. In order to increase the stability of the base 12, guide pillars 13 are vertically arranged at both ends of the inner side of the hood 1, and the ends of the base 12 are movably connected with the guide pillars 13. The lower end of the screw 14 extends to the inner side of the frame 2 and is provided with a synchronous wheel 16. The two synchronous wheels 16 are jointly provided with a synchronous belt 15. A first driving source 10 for driving one of the screws 14 to rotate is arranged at one end of the inner side of the frame 2. The first driving source 10 is preferably a reduction motor; like Figure 3-Figure 11 , Figure 13-14As shown, it also includes a guiding mechanism for driving the displacement of the protective plate 8 and the cross arm 17, the guiding mechanism includes a sliding plate 11 movably connected to the inner wall of the hood 1 and corresponding to the cross arm 17, the movable direction of the sliding plate 11 is perpendicular to the movable direction of the protective plate 8, the upper end side wall of the sliding plate 11 is vertically provided with a vertical groove 40, the lower end of the vertical groove 40 is obliquely provided with a second guide groove 39, and the depth of the second guide groove 39 is less than the depth of the vertical groove 40, and the second guide groove 39 is provided with a first guiding slope 42 at one end of the second guide groove 39 close to the vertical groove 40, and the two ends of the first guiding slope 42 are smoothly transitioned with the inner walls of the second guide groove 39 and the vertical groove 40 respectively, and the end of the cross arm 17 away from the clamping block 7 is used for active guiding cooperation with the vertical groove 40 and the second guide groove 39, and is configured so that when the end of the cross arm 17 corresponds to the second guide groove 39 When the clamping block 7 is just in a clamping state for the end of the steel strand body 4, in order to reduce friction, a first guide wheel 29 can be rotatably provided at the end of the cross arm 17 away from the clamping block 7. In order to reduce friction at the end of the first guide wheel 29, a ball 30 can be movably provided at the end of the first guide wheel 29 away from the cross arm 17. The end of the cross arm 17 is movably guided and matched with the vertical groove 40 and the second guide groove 39 through the first guide wheel 29. A second guide wheel 37 is rotatably provided on one side of the upper end of the sliding plate 11. The second guide wheel 37 is vertically arranged. A first guide groove 38 corresponding to the second guide wheel 37 is provided at the bottom end of the protective plate 8, and the second guide wheel 37 is movably guided and matched with the first guide groove 38, and is configured so that when one end of the cross arm 17 corresponds to the lower end of the second guide groove 39, the protective plate 8 just completely blocks the entrance and exit 3.

[0023] like Figure 1 , Figure 3-Figure 4 , Figure 6-Figure 10 , Figure 13-14As shown, in order to facilitate the loosening of the steel strand body 4, a loosening and resetting mechanism for loosening the two ends of the steel strand body 4 is provided in the hood 1, and the loosening and resetting mechanism includes a transverse groove 41 transversely arranged at the lower end of the second guide groove 39, and the depth of the second guide groove 39 is less than the depth of the transverse groove 41, and the second guide groove 39 is provided with a second guide slope 43 at one end close to the transverse groove 41, and the second guide slope 43 smoothly transitions with the transverse groove 41 and the inner wall of the second guide groove 39, and the end of the cross arm 17 is also coordinated with the transverse groove 41 through the first guide wheel 29. In order to facilitate the resetting of the clamping block 7, a spring 44 is provided between the two second sliders 31, and in order to facilitate the synchronous positioning of the two carriers 5 The mounting groove 19 is provided on the side of the base 12, and the upper and lower ends of the mounting groove 19 are slidably connected with rack plates 20, and the two rack plates 20 are arranged opposite to each other. A gear 23 located between the two rack plates 20 is rotatably provided in the middle of the inner side of the mounting groove 19, and the gear 23 is meshed with the rack plates 20. The side walls of the two rack plates 20 at one end away from each other in the same mounting groove 19 are fixedly connected with the side walls of the two second sliders 31 respectively. In order to facilitate the removal of the steel strand body 4, an "L"-shaped unloading arm 6 is provided at the end of the base 12, and the upper end of the unloading arm 6 corresponds to the gap between the two clamping blocks 7, and the side of the upper end of the unloading arm 6 close to the clamping block 7 is in a pointed cone shape.

[0024] When in use, the first driving source 10 drives the two screws 14 to rotate through the cooperation of the synchronous belt 15 and the synchronous wheel 16, thereby moving the base 12 upward, so that the clamping block 7 extends from the inlet and outlet 3, and the steel strand body 4 is respectively inserted into the gap between the clamping blocks 7 at both ends, and then the first driving source 10 is controlled to reverse, and the screw 14 drives the base 12 to gradually move downward, and the guide column 13 guides to increase the stability of the base 12. The first guide wheel 29 at one end of the cross arm 17 first enters the vertical groove 40, and when the clamping block 7 is completely lower than the protective plate 8, the first guide wheel 29 at one end of the cross arm 17 begins to enter the second guide groove 39 , and under the action of the first guide slope 42, the ball 30 at the end of the first guide wheel 29 goes uphill through the first guide slope 42, and then the cross arm 17 drives the clamping block 7 to move, and the clamping block 7 drives the second slider 31 to move, the spring 44 is compressed, and the second slider 31 is guided by the second slide groove 26 and the second guide rod 28, and the side wall of the clamping block 7 clamps the end of the steel strand body 4 through the arc clamping block 32 and the arc clamping groove 33, and the end of the steel strand body 4 is clamped and bent. When the first guide wheel 29 is located in the second guide groove 39, the steel strand body 4 is in a bent and clamped state, and as the base 12 moves downward The first guide wheel 29 at the end of the cross arm 17 gradually moves downward in the second guide groove 39, and then the sliding plate 11 moves horizontally. The sliding plate 11 drives the protective plate 8 to move horizontally through the cooperation of the second guide wheel 37 and the first guide groove 38. The protective plate 8 blocks the entrance 3. After the blocking is complete, the first guide wheel 29 is located at the corresponding position of the lower end of the second guide groove 39 and the cross groove 41. At this time, the first driving source 10 stops, and the second driving source 18 is controlled to push the carrier 5 corresponding to the tension sensor 21, so that the steel strand body 4 is stressed, and the tension sensor 21 detects the tension until the steel strand body 4 breaks. After the break, the second driving source 1 8 continues to drive the carrier 5 to move, and under the action of the rack plate 20 and the gear 23, the other carrier 5 moves in the opposite direction, the first guide wheel 29 at the end of the cross arm 17 enters the cross groove 41, and then the ball 30 starts to go downhill through the second guide slope 43, and then the spring 44 resets, and the clamping block 7 loosens the steel strand body 4. With the displacement of the carrier 5, one side of the upper end of the discharge arm 6 enters the gap of the clamping block 7, and the discharge arm 6 can push out the clamping block 7 between the two clamping blocks 7. Finally, the second driving source 18 resets to drive the two carriers 5 to reset, and then the first driving source 10 lifts the clamping block 7 again to wait for subsequent detection; It should be noted that after the clamping block 7 clamps the steel strand body 4, the end of the steel strand body 4 is in a bent state. When the steel strand body 4 is subjected to force, part of the force will be applied to the arc-shaped clamping block 32, and the arc-shaped clamping block 32 will tend to move. The arc-shaped clamping block 32 will act on the driving arm 36 with the force it receives, and the driving arm 36 will also tend to move. Then the driving arm 36 tends to push the secondary clamping block 34 outward, and then the secondary clamping block 34 can further tighten the steel strand body 4. The greater the traction force applied to the arc-shaped clamping block 32, the tighter the secondary clamping block 34 will contact the steel strand body 4, thereby increasing the firmness.

[0025] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A bridge steel strand tensile strength testing device, comprising a frame (2) and a steel strand body (4), characterized in that: The frame (2) is provided with a detection mechanism, the detection mechanism comprising a base (12) arranged on the top of the frame (2), and platforms (5) are respectively arranged at both ends of the base (12), one side of one of the platforms (5) is fixedly provided with a tension sensor (21), a positioning seat (25) is arranged at the upper end of the platform (5), and the positioning seat (25) on the platform (5) corresponding to the tension sensor (21) is slidably connected to the upper end of the platform (5), and one side of the positioning seat (25) is bolted to one end of the tension sensor (21), and the positioning seat (25) on the platform (5) away from the tension sensor (21) is fixedly arranged at the upper end of the platform (5), and a clamping mechanism for fixing the end of the steel strand body (4) is arranged on the positioning seat (25), and a second driving source (18) for driving the platform (5) corresponding to the tension sensor (21) to move is arranged at one end of the top of the base (12); The clamping mechanism comprises clamping blocks (7) slidably connected to two ends of the positioning seat (25), and a cross arm (17) for pushing the clamping blocks (7) to move is fixedly provided on opposite sides of the two clamping blocks (7); A protective mechanism is provided at the upper end of the frame (2), the protective mechanism comprising a hood (1) provided at the top of the frame (2) for covering the detection mechanism, an entrance (3) for the detection mechanism to enter and exit is provided at the top of the hood (1), and protective plates (8) for covering the entrance (3) are symmetrically slidably connected to both sides of the top of the inner cavity of the hood (1); A driving mechanism for driving the base (12) to rise and fall is provided at the bottom of the base (12); The invention also comprises a guide mechanism for driving the displacement of the protective plate (8) and the cross arm (17), the guide mechanism comprising a sliding plate (11) movably connected to the inner wall of the hood (1) and corresponding to the cross arm (17), the movable direction of the sliding plate (11) being perpendicular to the movable direction of the protective plate (8), a vertical groove (40) being vertically arranged on the upper side wall of the sliding plate (11), a second guide groove (39) being obliquely arranged on the lower end of the vertical groove (40), and a depth of the second guide groove (39) being less than a depth of the vertical groove (40), a first guide slope (42) being arranged at one end of the second guide groove (39) close to the vertical groove (40), and two ends of the first guide slope (42) being respectively connected to the second guide groove (39) and the vertical groove (40). The inner wall of the cross arm (17) has a smooth transition, one end of the cross arm (17) away from the clamping block (7) is used to cooperate with the vertical groove (40) and the second guide groove (39) for active guidance, and is configured so that when the end of the cross arm (17) corresponds to the second guide groove (39), the clamping block (7) is just in a clamping state with the end of the steel strand body (4), one side of the upper end of the sliding plate (11) is rotatably provided with a second guide wheel (37), the bottom end of the protective plate (8) is provided with a first guide groove (38) corresponding to the second guide wheel (37), and the second guide wheel (37) is movably guided to cooperate with the first guide groove (38), and is configured so that when one end of the cross arm (17) corresponds to the lower end of the second guide groove (39), the protective plate (8) just completely blocks the entrance (3).

2. A bridge steel strand tensile strength detection device according to claim 1, characterized in that: The driving mechanism comprises screw rods (14) rotatably arranged at two ends of an inner cavity of a machine cover (1), two ends of a base (12) respectively threadably engage with the two screw rods (14), the lower ends of the screw rods (14) extend to the inner side of a frame (2) and are provided with a synchronous wheel (16), a synchronous belt (15) is commonly provided on the two synchronous wheels (16), and a first driving source (10) for driving one of the screw rods (14) to rotate is provided at one end of the inner side of the frame (2).

3. A bridge steel strand tensile strength detection device according to claim 1, characterized in that: A first guide wheel (29) is rotatably provided at one end of the cross arm (17) away from the clamping block (7), and the end of the cross arm (17) is movably guided and matched with the vertical groove (40) and the second guide groove (39) through the first guide wheel (29); A ball (30) is movably provided on one end of the first guide wheel (29) away from the cross arm (17).

4. A bridge steel strand tensile strength detection device according to claim 3, characterized in that: The hood (1) is provided with a loosening and resetting mechanism for loosening the two ends of the steel strand body (4), the loosening and resetting mechanism comprising a transverse groove (41) arranged transversely at the lower end of the second guide groove (39), a second guide slope (43) is arranged at one end of the second guide groove (39) close to the transverse groove (41), and the second guide slope (43) smoothly transitions with the transverse groove (41) and the inner wall of the second guide groove (39), and the end of the cross arm (17) is movably guided and matched with the transverse groove (41) through the first guide wheel (29); The upper end of the positioning seat (25) is provided with a second slide groove (26), and the inner two ends of the second slide groove (26) are symmetrically slidably connected with second sliders (31) corresponding to the clamping block (7), the top of the second slider (31) is fixedly connected to the bottom of the clamping block (7), a spring (44) is provided between the two second sliders (31), and a second guide rod (28) is provided inside the second slide groove (26), and the second slider (31) is movably sleeved on the outer side of the second guide rod (28); The two ends of the top of the base (12) are symmetrically provided with first slide grooves (22), the inner side of the first slide groove (22) is slidably connected with a second slide block (31) corresponding to the carrier (5), the top of the second slide block (31) is fixedly connected to the bottom of the carrier (5), the inner side of the first slide groove (22) is provided with a first guide rod (24), the second slide block (31) is movably sleeved on the outer side of the first guide rod (24), the side edge of the base (12) is provided with a mounting groove (19), the upper and lower ends of the mounting groove (19) are slidably connected with a rack plate (20), a gear (23) located between the two rack plates (20) is rotatably provided in the middle part of the inner side of the mounting groove (19), and the gear (23) is meshed with the rack plate (20), and the side walls of the two rack plates (20) in the same mounting groove (19) that are away from each other are respectively fixedly connected to the side walls of the two second slide blocks (31).

5. A bridge steel strand tensile strength detection device according to claim 4, characterized in that: An "L"-shaped discharge arm (6) is provided at the end of the base (12); the upper end of the discharge arm (6) corresponds to the gap between the two clamping blocks (7), and the side of the upper end of the discharge arm (6) close to the clamping blocks (7) is in a pointed cone shape.

6. A bridge steel strand tensile strength detection device according to claim 1, characterized in that: An arc-shaped arc-shaped clamping block (32) is provided on opposite sides of the two clamping blocks (7) on the same positioning seat (25), an arc-shaped arc-shaped clamping groove (33) is provided between adjacent arc-shaped clamping blocks (32), and the arc-shaped clamping block (32) on one clamping block (7) corresponds to the arc-shaped clamping groove (33) on the other clamping block (7).

7. A bridge steel strand tensile strength detection device according to claim 6, characterized in that: The arc-shaped clamping block (32) is slidably matched with the side of the clamping block (7); a mounting cavity (35) is provided on a side of the clamping block (7) close to the arc-shaped clamping block (32); a driving arm (36) is slidably connected to the inner side of the positioning seat (25); one end of the driving arm (36) is fixedly connected to a side of the arc-shaped clamping block (32) close to the clamping block (7); a secondary clamping block (34) corresponding to the mounting cavity (35) is movably connected to a side of the clamping block (7) close to the arc-shaped clamping groove (33); and the inner end of the secondary clamping block (34) is matched with an inclined surface of one end of the driving arm (36).

8. A bridge steel strand tensile strength detection device according to claim 2, characterized in that: Guide pillars (13) are vertically arranged at both ends of the inner side of the hood (1), and the ends of the base (12) are movably connected to the guide pillars (13).

9. The bridge steel strand tensile strength detection device according to claim 1, characterized in that: The second driving source (18) is a hydraulic cylinder; The first driving source (10) is a reduction motor.

10. The bridge steel strand tensile strength detection device according to claim 1, characterized in that: The end of the protective plate (8) and the top of the hood (1) are both provided with avoidance grooves (9) corresponding to the cross arms (17).

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