Prestressed steel strand turnover device for broken line pre-tensioning method concrete precast beam

Abstract

The invention relates to the field of loading and transportation, and discloses a broken line pre-tensioning method concrete precast beam prestressed steel strand turnover device which comprises a turnover trolley plate, and discharging mechanisms are symmetrically arranged on the end faces of the two ends of the turnover trolley plate. The discharging mechanism comprises a side plate parallel to the end face of the turnover trolley plate. The discharging rods are used for bearing the steel strands moved out of the edge of the turnover trolley plate, and blocking columns are inserted into the discharging rods in the material receiving state; the connecting rod assembly is used for pushing the discharging rod to be switched between a material receiving state and a discharging state; and the pushing assembly is used for moving the side plate and enabling the discharging rod to be located above the turnover trolley plate when the discharging mechanism is not used. When the steel strand is moved out, the steel strand moving-out position can be far away from a tire of a flat car, the possibility that the tire is damaged by the steel strand is reduced, and the steel strand cannot be rolled by the flat car.

Description

Technical Field

[0001] This application relates to the field of loading and transportation, and in particular to a turnover device for prestressed steel strands of precast concrete beams by the broken-line pretensioning method. Background Art

[0002] The prestress of precast beams refers to the force applied to the beam in advance to generate a negative bending moment at the mid-span, so as to partially offset the positive bending moment during the use of the beam. Prestress is generally applied to precast beams by the pretensioning method and the post-tensioning method. In the pretensioning method, the prestressed steel bars are tensioned and fixed before the concrete is poured, and then the concrete is poured. The precompressive stress is transmitted through the bonding force between the concrete and the prestressed steel bars. In the post-tensioning method, after the concrete is poured and the concrete strength reaches the design requirements, the prestressed steel bars are tensioned, and the elastic rebound of the steel bars is prevented by the anchor device, so that the concrete obtains the precompressive stress.

[0003] Whether it is the pretensioning method or the post-tensioning method, before tensioning the ends of the steel bars, the steel strands are connected to the steel bars, and the tensioning of the steel bars is realized by tensioning the steel strands. The steel strands are cut off after tensioning, so that the steel strands are separated from the steel bars. After that, the steel strands can be applied to other precast concrete beams for prestress tensioning. Therefore, the turnover of the steel strands is a common construction operation in the precast beam yard.

[0004] However, in the process of implementing the related technical solutions, it is found that there are at least the following technical problems: The vehicle for transporting the steel strands is generally a flatbed truck. When the steel strands are removed from the flatbed truck, they are generally pushed down directly from the edge of the flatbed truck. The steel strands that fall to the ground often come into contact with the tires of the flatbed truck, which may cause the tires to burst. The movement of the flatbed truck often rolls over the steel strands. Therefore, it not only affects the service life of the tires, but also affects the quality of the steel strands. Summary of the Invention

[0005] This application provides a turnover device for prestressed steel strands of precast concrete beams by the broken-line pretensioning method, which solves the technical problem that the steel strands pushed out often pierce the tires of the flatbed truck in the prior art, and realizes that when the steel strands are removed, the removal position of the steel strands can be far away from the tires of the flatbed truck, reducing the possibility of damage to the tires caused by the steel strands, and also preventing the flatbed truck from rolling over the steel strands.

[0006] The present application provides a turnover device for prestressed steel strands of a folded-line pretensioned concrete precast beam, including a turnover vehicle plate, and blanking mechanisms are symmetrically arranged on the end faces at both ends of the turnover vehicle plate; the blanking mechanism includes: a side plate parallel to the end face of the turnover vehicle plate; a blanking rod for receiving the steel strands moved out from the edge of the turnover vehicle plate. When the blanking mechanism is in the material receiving state, the blanking rod is horizontal and perpendicular to the edge of the turnover vehicle plate. When the blanking mechanism is in the blanking state, the blanking rod is located above the outside of the turnover vehicle plate and is inclined, and the end of the inclined blanking rod close to the turnover vehicle plate is higher than the other end. A stop post is inserted at the end of the blanking rod away from the turnover vehicle plate when it is in the material receiving state; a connecting rod assembly is installed on the side plate and is used to push the blanking rod to switch between the material receiving state and the blanking state, and the blanking rod gradually forms an inclined shape from the horizontal state during the conversion from the material receiving state to the blanking state; a pushing component is used to move the side plate and make the blanking rod of the blanking mechanism located above the turnover vehicle plate when it is in the non-use state.

[0007] Further, the connecting rod assembly includes: a first long connecting rod, one end of which is hinged to the side plate, and the other end faces the outside of the turnover vehicle plate and is higher than the hinged end; a second long connecting rod, one end of which is hinged to the side plate, and the other end faces the inside of the turnover vehicle plate; a first short connecting rod, one end of which is hinged to the end of the second long connecting rod away from the side plate; a second short connecting rod, one end of which is hinged to the second long connecting rod and is parallel to the first short connecting rod; a first parallel rod, one end of which is hinged to the end of the first short connecting rod away from the second long connecting rod, and the other end is hinged to the end of the second short connecting rod away from the second long connecting rod. The first parallel rod is parallel to the second long connecting rod. The end of the first long connecting rod away from the side plate is hinged to one end of the first parallel rod. The hinge axis between the first parallel rod and the first long connecting rod and the hinge axis between the second short connecting rod and the first parallel rod are the same axis; a third long connecting rod, one end of which is hinged to the end of the second short connecting rod away from the second long connecting rod, and the other end is located below the second long connecting rod. The hinge axis between the third long connecting rod and the second short connecting rod and the hinge axis between the second short connecting rod and the first parallel rod are the same axis; a rod mounting rod for the blanking rod, one end of which is hinged to the end of the second long connecting rod away from the side plate, and the other end faces the outside of the turnover vehicle plate. The hinge axis between the rod mounting rod for the blanking rod and the second long connecting rod and the hinge axis between the second long connecting rod and the first short connecting rod are the same axis. The rod mounting rod for the blanking rod and the third long connecting rod are in a cross shape and are hinged to each other at the cross. The blanking rod is parallel to the rod mounting rod for the blanking rod, and the blanking rod is fixed to the side wall of the rod mounting rod for the blanking rod facing the turnover vehicle plate; a hydraulic cylinder is installed on the side plate, and the telescopic rod of the hydraulic cylinder is hinged to the first long connecting rod, and the bottom of the hydraulic cylinder is hinged to the side plate.

[0008] Further, the connecting rod assembly further includes: a short connecting rod III, one end of which is hinged to the end of the long connecting rod III away from one end of the short connecting rod II, and the other end faces the outside of the turnover car plate; a parallel rod II, one end of which is hinged to the end of the short connecting rod III away from the long connecting rod III, and the other end is hinged to the end of the material rod mounting rod away from the long connecting rod II, and the parallel rod II is parallel to the long connecting rod III; the blanking mechanism further includes: an extension rod for receiving the steel strand sliding down from the blanking rod, fixed on the side wall of the parallel rod II facing the turnover car plate, and the extension rod in the blanking state of the blanking mechanism is coaxial with the blanking rod.

[0009] Further, at least one blanking rod and at least one extension rod are provided, and the material rods and the extension rods are arranged side by side.

[0010] Further, the pushing component includes: a slide rail fixed on the end face of the turnover car plate and horizontally arranged; a slider slidably connected to the slide rail; a connecting block fixed to the slider; a column vertically arranged and fixed to the connecting block; a connecting sleeve fixed to the side plate and sleeved on the column, and there is a clearance fit between the connecting sleeve and the column; wherein, a threaded connection hole is formed on the column, and a limit bolt is threadedly connected to the threaded connection hole, and the limit bolt is used to abut against the bottom surface of the connecting sleeve, and the connecting rod assembly in the state where the limit bolt abuts against the connecting sleeve is located above the turnover car plate.

[0011] Further, a rib plate is fixedly connected between the connecting sleeve and the side plate.

[0012] Further, the connecting sleeve is located at the end of the side plate close to the inner side of the turnover car plate.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] Due to the adoption of the blanking rod and the connecting rod assembly, the blanking rod can be gradually lifted and finally tilted through the connecting rod assembly, and one end of the blanking rod in the tilted state close to the turnover car plate is higher than the other end. Thus, the steel strand can be dropped to a position far from the traveling wheel, thereby reducing the possibility of damage to the traveling wheel caused by the steel strand, and also preventing the traveling wheel from rolling over the steel strand. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of a prestressed steel strand turnover device for a precast concrete beam by the broken line pretensioning method in an embodiment of this application;

[0016] Figure 2 For Figure 1Schematic diagram of a partial structure, mainly showing the structure of the blanking mechanism on the turnover vehicle board when it is in a non-use state;

[0017] Figure 3 is Figure 2 Schematic diagram of a partial structure in [reference], mainly showing the structure of the connecting rod assembly;

[0018] Figure 4 Schematic diagram of the structure of the blanking mechanism in the blanking state in the embodiment of the present application;

[0019] Figure 5 Schematic diagram of the structure of the blanking mechanism in the material receiving state on the turnover vehicle board in the embodiment of the present application;

[0020] In the figure: 1. Turnover vehicle board; 2. Blanking mechanism; 21. Side plate; 22. Blanking rod; 2201. Stopping column; 23. Connecting rod assembly; 231. First long connecting rod; 232. Second long connecting rod; 233. First short connecting rod; 234. Second short connecting rod; 235. First parallel rod; 236. Third long connecting rod; 237. Rod installation rod; 238. Hydraulic cylinder; 239. Third short connecting rod; 2310. Second parallel rod; 24. Connecting rod assembly; 241. Slide rail; 242. Slide block; 243. Connecting block; 244. Column; 2441. Threaded connection hole; 245. Connecting sleeve; 2451. Rib plate; 246. Limit bolt; 25. Extension rod; 3. Traveling wheel; 4. Cab. Detailed implementation mode

[0021] The embodiment of the present application discloses a prestressed steel strand turnover device for a precast concrete beam by the broken line pre-tensioning method. By starting the hydraulic cylinder 238, the telescopic rod of the hydraulic cylinder 238 extends. Driven by the connecting rod assembly 2423, the blanking rod 22 is gradually lifted and finally tilted. At the same time, the extension rod 25 and the blanking rod 22 are coaxially arranged. Then, the stopping column 2201 is removed. In the blanking state, the blanking rod 22 and the extension rod 25 can drop the steel strand to a position far from the traveling wheel 3, thereby reducing the possibility of damage to the traveling wheel 3 caused by the steel strand and preventing the traveling wheel 3 from rolling over the steel strand, solving the technical problem that the pushed-out steel strand often pierces the tire of the flatbed truck in the prior art.

[0022] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation modes.

[0023] Refer to Figure 1, a turnover device for prestressed steel strands of a folded-line pretensioned concrete precast beam, comprising a turnover vehicle plate 1, a blanking mechanism 2, traveling wheels 3 and a cab 4. The turnover vehicle plate 1 is a rectangular plate, and traveling wheels 3 are installed at the four bottom corners of the turnover vehicle plate 1. The cab 4 is located at the middle position in the advancing direction of the turnover vehicle plate 1. Four groups of blanking mechanisms 2 are provided, and are symmetrically arranged in pairs on both sides of the two end faces of the turnover vehicle plate 1.

[0024] Refer to Figure 2 , the blanking mechanism 2 includes a side plate 21, a blanking rod 22, a connecting rod assembly 2423, a pushing assembly and an extension rod 25. The side plate 21 is a strip-shaped plate, the side plate 21 is located outside the end face of the turnover vehicle plate 1 and has a spacing from the end face of the turnover vehicle plate 1, and the length direction of the side plate 21 is consistent with the length direction of the end face of the turnover vehicle plate 1; the connecting rod assembly 2423 is installed on the side wall of the side plate 21 facing the end face of the turnover vehicle plate 1, and the connecting rod assembly 2423 operates movably between the side plate 21 and the end face of the turnover vehicle plate 1; the pushing assembly is installed between the side wall of the side plate 21 facing away from the turnover vehicle plate 1 and the end face of the turnover vehicle plate 1; both the blanking rod 22 and the extension rod 25 are installed on the connecting rod assembly 2423, and both the blanking rod 22 and the extension rod 25 are located on the side of the connecting rod assembly 2423 facing away from the side plate 21. Among them, the blanking rod 22 is used to receive the steel strands moved out from the edge of the turnover vehicle plate 1, and the extension rod 25 is used to receive the steel strands slipping from the blanking rod 22.

[0025] Refer to Figure 3The connecting rod assembly 2423 includes a long connecting rod 1 231, a long connecting rod 232, a short connecting rod 1 233, a short connecting rod 234, a parallel rod 1 235, a long connecting rod 3 236, a material rod mounting rod 237, a hydraulic cylinder 238, a short connecting rod 3 239 and a parallel rod 2 2310. The long connecting rod 1 231 and the long connecting rod 232 are respectively located at the two ends of the side panel 21, one end of the long connecting rod 1 231 is hinged to the end of the side panel 21 that is closer to the center line of the turnover vehicle plate 1, and the other end of the long connecting rod 1 231 is located above the side panel 21 and faces the outside of the turnover vehicle plate 1, one end of the long connecting rod 232 is hinged to the end of the side panel 21 that is farther away from the center line of the turnover vehicle plate 1, and the other end of the long connecting rod 232 faces the inside of the turnover vehicle plate 1, the hinge axes of the long connecting rod 1 231 and the long connecting rod 232 and the side panel 21 are perpendicular to the side panel 21 and are consistent with the length direction of the turnover vehicle plate 1, in addition, the long connecting rod 232 is located on the side of the long connecting rod 1 231 away from the side panel 21. The short link 1 233 and the short link 234 are parallel to each other, one end of the short link 1 233 is hinged to the end of the long link 232 away from the side plate 21, the other end of the short link 1 233 is located above the long link 232, one end of the short link 2 234 is hinged between the ends of the long link 232, and the hinge point is close to the hinged end of the long link 232 and the side plate 21, the other end of the short link 2 234 is located above the long link 232, in addition, the short link 1 233 and the short link 2 234 are both located on the side of the long link 2 232 close to the side plate 21. One end of the parallel rod 1 235 is hinged to the end of the short link 1 233 away from the end of the long link 232, and the other end of the parallel rod 1 235 is hinged to the end of the short link 2 234 away from the end of the long link 232. The parallel rod 1 235 is parallel to the long link 232, and a parallelogram is formed between the long link 1 231, the short link 1 233, the parallel rod 1 235 and the short link 2 234. In addition, the parallel rod 1 235 is located on the side of the short link 1 233 and the short link 2 234 away from the long link 232. One end of the long link three 236 is hinged to the end of the short link two 234 away from one end of the long link two 232, and the other end of the long link three 236 is located below the long link two 232. The long link three 236 is located on the side of the long link two 232 away from the side plate 21, and the hinge axis between the long link three 236 and the short link two 234, the hinge axis between the short link two 234 and the parallel rod one 235, and the hinge axis between the parallel rod one 235 and the long link two 232 are all the same axis.The rod mounting rod 237 is located on the side of the long connecting rod three 236 away from the long connecting rod two 232. One end of the rod mounting rod 237 is hinged to the end of the long connecting rod two 232 away from one end of the side plate 21, and the other end faces the outside of the turnover car plate 1. The hinge axis between the rod mounting rod 237 and the long connecting rod two 232 is the same axis as the hinge axis between the long connecting rod two 232 and the short connecting rod one 233. The rod mounting rod 237 and the long connecting rod three 236 are in a cross shape, and the intersection between the rod mounting rod 237 and the long connecting rod three 236 is hinged to each other. The lower material rod 22 is parallel to the rod mounting rod 237, and the lower material rod 22 is fixed to the side wall of the rod mounting rod 237 facing the turnover car plate 1. There are two lower material rods 22 arranged side by side. A stop post 2201 is inserted at the end of the lower material rod 22 away from the turnover car plate 1 in the material receiving state, and the stop post 2201 can be freely pulled out or inserted into the lower material rod 22. The short connecting rod three 239 is located on the side of the rod mounting rod 237 away from the long connecting rod three 236. One end of the short connecting rod three 239 is hinged to the end of the long connecting rod three 236 away from the short connecting rod two 234, and the other end faces the outside of the turnover car plate 1. The parallel rod two 2310 is located on the side of the rod mounting rod 237 away from the long connecting rod three 236. One end of the parallel rod two 2310 is hinged to the end of the short connecting rod three 239 away from the long connecting rod three 236, and the other end is hinged to the end of the rod mounting rod 237 away from one section of the long connecting rod two 232. The parallel rod two 2310 is parallel to the long connecting rod three 236. A parallelogram is formed among the parallel rod two 2310, the short connecting rod two 234, the long connecting rod three 236, and the rod mounting rod 237. Among them, the extension rod 25 is fixed to the side wall of the parallel rod two 2310 facing the turnover car plate 1. The hydraulic cylinder 238 can be controlled by the hydraulic system in the cab 4. The hydraulic cylinder 238 is located between the short connecting rod two 234 and the long connecting rod one 231, and is located below the long connecting rod one 231. The hydraulic cylinder 238 is installed on the side plate 21. The telescopic rod of the hydraulic cylinder 238 is hinged to the long connecting rod one 231, and the hinge point is located at one end of the long connecting rod one 231 close to the parallel rod one 235. The bottom of the hydraulic cylinder 238 is hinged to the side plate 21. The hydraulic cylinder 238 is used to push the swing of the long connecting rod one 231.

[0026] When the hydraulic cylinder 238 is in the contracted state (as Figure 3 shown), the end of the long connecting rod three 236 away from the short connecting rod two 234 is located below the long connecting rod two 232, the rod mounting rod 237 is in a horizontal state, so the lower material rod 22 is also in a horizontal state, and the included angle between the parallel rod two 2310 and the rod mounting rod 237 is an acute angle, so the included angle between the extension rod 25 and the lower material rod 22 is also an acute angle. When the hydraulic cylinder 238 is in the extended state (as Figure 4As shown, the end of the long connecting rod three 236 away from the short connecting rod two 234 is located above the long connecting rod two 232. The material rod mounting rod 237 is lifted upward and is inclined, so the blanking rod 22 is also inclined, and the end of the blanking rod 22 close to the turnover car plate 1 is higher than the other end. The extension rod 25 is located on the extension line of the blanking rod 22.

[0027] Referring to Figure 2 , Figure 3 and Figure 5 As shown, the pushing component includes a slide rail 241, a slider 242, a connecting block 243, a column 244, a connecting sleeve 245 and a limit bolt 246. The slide rail 241 is horizontally arranged and fixed on the end face of the turnover car plate 1; the slider 242 is slidably connected to the slide rail 241; the connecting block 243 is fixed on the slider 242; the column 244 is vertically arranged and fixed on the connecting block 243. By using the connecting block 243, a distance can be provided between the column 244 and the end face of the turnover car plate 1; the connecting sleeve 245 is located at the end of the side plate 21 close to the inner side of the turnover car plate 1. There are two connecting sleeves 245, and both of the two connecting sleeves 245 are fixed on the side plate 21. The two connecting sleeves 245 are arranged up and down and are coaxial, and rib plates 2451 are fixedly connected between both of the two connecting sleeves 245 and the side plate 21. Both of the two connecting sleeves 245 are sleeved on the column 244, and there is a clearance fit between the connecting sleeve 245 and the column 244, so that the side plate 21 can move on the column 244, and by using the slider 242, the side plate 21 can move along the length direction of the slide rail 241. In addition, a threaded connection hole 2441 is opened on the column 244, and the limit bolt 246 is threadedly connected to the threaded connection hole 2441. After moving the lower connecting sleeve 245 above the threaded connection hole 2441, the limit bolt 246 is threadedly connected to the threaded connection hole 2441. At this time, the limit bolt 246 can limit the height of the side plate 21.

[0028] When the blanking mechanism 2 is not needed, the hydraulic cylinder 238 is contracted, and then by using the clearance fit between the column 244 and the connecting sleeve 245, the side plate 21 is moved upward, and then limited by the limit bolt 246. Then the column 244 is pushed, so that the column 244 moves towards the inner side of the turnover car plate 1, so that the side plate 21, the blanking rod 22 and the connecting rod assembly 2423 can be placed above the turnover car plate 1, and the extension rod 25 abuts against the edge of the turnover car plate 1. Therefore, during the walking of the turnover car plate 1, the hindrance to the walking of the turnover car plate 1 can be reduced.

[0029] The functional principle of the present application can be described through the following operation methods:

[0030] When the turnover car plate 1 is loaded with steel strands and needs to unload the materials, move the side plate 21 outward from the turnover car plate 1, and remove the limit bolt 246, so that the side plate 21 moves downward. Then insert the stop post 2201 at one end of the blanking rod 22 away from the turnover car plate 1. At this time, the blanking mechanism 2 is in the material receiving state. Therefore, the steel strands on the turnover car plate 1 can be first pushed onto the blanking rod 22.

[0031] When the blanking rod 22 is filled with steel strands, start the hydraulic cylinder 238. The telescopic rod of the hydraulic cylinder 238 extends. Driven by the connecting rod assembly 2423, the blanking rod 22 is gradually lifted and finally in an inclined state. One end of the inclined blanking rod 22 close to the turnover car plate 1 is higher than the other end. At the same time, the extension rod 25 is coaxial with the blanking rod 22. At this time, the blanking mechanism 2 is in the blanking state. Then remove the stop post 2201. The blanking rod 22 and the extension rod 25 in the blanking state can drop the steel strands to a position farther from the traveling wheels 3, thereby reducing the possibility of damage to the traveling wheels 3 caused by the steel strands and also preventing the traveling wheels 3 from rolling over the steel strands.

[0032] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

[0033] The above is only the preferred specific implementation manner of the embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application, according to the technical solution and its concept of this application, makes equivalent replacements or changes, and should be covered by the protection scope of this application.

Claims

1. A prestressed steel strand turnover device for precast concrete beams using a folding line pretensioning method, comprising a turnover vehicle plate (1), characterized in that: The end surfaces at both ends of the turnover vehicle plate (1) are symmetrically provided with material unloading mechanisms (2); The unloading mechanism (2) comprises: A side plate (21) parallel to the end surface of the turnover vehicle plate (1); A feeding rod (22) is used to receive the steel strands removed from the edge of the turnover vehicle plate (1); when the feeding mechanism (2) is in a material receiving state, the feeding rod (22) is horizontal and perpendicular to the edge of the turnover vehicle plate (1); when the feeding mechanism (2) is in a material receiving state, the feeding rod (22) is located above the outer side of the turnover vehicle plate (1) and is inclined; and in an inclined state, one end of the feeding rod (22) close to the turnover vehicle plate (1) is higher than the other end; and a blocking column (2201) is inserted at one end of the feeding rod (22) away from the turnover vehicle plate (1) in a material receiving state; A connecting rod assembly (23) is installed on the side plate (21) and is used to push the material discharge rod (22) to switch between a material receiving state and a material discharge state, and the material discharge rod (22) gradually changes from a horizontal state to an inclined state during the conversion process from the material receiving state to the material discharge state; The pushing assembly (24) is used to move the side plate (21) and enable the unloading rod (22) of the unloading mechanism (2) to be located above the turnover vehicle plate (1) when the unloading mechanism (2) is not in use.

2. A prestressed steel strand turnover device for precast concrete beams using a folding line pretensioning method as claimed in claim 1, characterized in that: The connecting rod assembly (23) comprises: A long connecting rod (231), one end of which is hinged to the side plate (21), and the other end of which faces the outside of the turnover vehicle plate (1) and is higher than the hinged end; A second long connecting rod (232), one end of which is hinged to the side plate (21) and the other end of which faces the inner side of the turnover vehicle plate (1); A short connecting rod (233) having one end hinged to an end of the long connecting rod (232) away from the side plate (21); A second short link (234), one end of which is hinged to the second long link (232) and is parallel to the first short link (233); A parallel rod (235), one end of which is hinged to the end of the short link (233) away from the end of the long link (232), and the other end of which is hinged to the end of the short link (234) away from the end of the long link (232), the parallel rod (235) is parallel to the long link (232), one end of the long link (231) away from the side plate (21) is hinged to one end of the parallel rod (235), and the hinge axis between the parallel rod (235) and the long link (231) and the hinge axis between the short link (234) and the parallel rod (235) are the same axis; A long connecting rod 3 (236), one end of which is hinged to the end of the short connecting rod 2 (234) away from one end of the long connecting rod 2 (232), and the other end is located below the long connecting rod 2 (232), and the hinge axis between the long connecting rod 3 (236) and the short connecting rod 2 (234) and the hinge axis between the short connecting rod 2 (234) and the parallel rod 1 (235) are the same axis; The material rod mounting rod (237) has one end hinged to the end of the second long connecting rod (232) away from one end of the side plate (21), and the other end faces the outer side of the turnover vehicle plate (1). The hinge axis between the material rod mounting rod (237) and the second long connecting rod (232) and the hinge axis between the second long connecting rod (232) and the first short connecting rod (233) are the same axis. The material rod mounting rod (237) and the third long connecting rod (236) are in a cross shape and are hinged to each other at the intersection. The unloading material rod (22) is parallel to the material rod mounting rod (237), and the unloading material rod (22) is fixed to the side wall of the material rod mounting rod (237) facing the turnover vehicle plate (1). A hydraulic cylinder (238) is installed on the side plate (21), a telescopic rod of the hydraulic cylinder (238) is hinged on the long connecting rod (231), and a bottom of the hydraulic cylinder (238) is hinged on the side plate (21).

3. A prestressed steel strand turnover device for precast concrete beams using a folding line pretensioning method as claimed in claim 2, characterized in that: The connecting rod assembly (23) further comprises: A short link three (239), one end of which is hinged to the end of the long link three (236) away from one end of the short link two (234), and the other end of which faces the outside of the turnover vehicle plate (1); Parallel rod 2 (2310), one end of which is hinged to the end of the short link 3 (239) away from one end of the long link 3 (236), and the other end of which is hinged to the end of the material rod mounting rod (237) away from a section of the long link 2 (232), and the parallel rod 2 (2310) is parallel to the long link 3 (236); The unloading mechanism (2) further comprises: The extension rod (25) is used to receive the steel strand that slides down from the unloading rod (22) and is fixed on the side wall of the second parallel rod (2310) facing the turnover vehicle plate (1). When the unloading mechanism (2) is in the unloading state, the extension rod (25) is coaxial with the unloading rod (22).

4. A prestressed steel strand turnover device for precast concrete beams using a folding line pretensioning method as claimed in claim 3, characterized in that: At least one of the feed rods (22) and the extension rod (25) is provided, and each of the feed rods (22) and each of the extension rods (25) are arranged side by side.

5. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method as claimed in claim 2, characterized in that: The pushing assembly (24) comprises: A slide rail (241) is fixed on the end surface of the turnover vehicle plate (1) and is arranged horizontally; A slider (242) slidably connected to the slide rail (241); A connecting block (243) fixed on the sliding block (242); A column (244) is vertically arranged and fixed on the connecting block (243); A connecting sleeve (245) is fixed on the side plate (21) and sleeved on the column (244), and a clearance fit is formed between the connecting sleeve (245) and the column (244); Wherein, a threaded connection hole (2441) is opened on the column (244), and a limiting bolt (246) is threadedly connected to the threaded connection hole (2441), and the limiting bolt (246) is used to abut against the bottom surface of the connecting sleeve (245). When the limiting bolt (246) and the connecting sleeve (245) are in a state of abutment, the connecting rod assembly (23) is located above the turnover vehicle plate (1).

6. A prestressed steel strand turnover device for precast concrete beams using a folding line pretensioning method as claimed in claim 5, characterized in that: A rib plate (2451) is fixedly connected between the connecting sleeve (245) and the side plate (21).

7. The prestressed steel strand turnover device for precast concrete beams using the folding line pretensioning method as claimed in claim 5, characterized in that: The connecting sleeve (245) is located at an end of the side plate (21) close to an inner end of the turnover vehicle plate (1).

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