A prefabricated box culvert flipping retractable lifting device and its usage method

Abstract

The present invention provides a precast box culvert flipping and telescopic lifting device and a using method thereof, which includes a lifting beam. Sliding arms that slide relative to each other are arranged on both sides of the lifting beam. A sliding lifting and flipping mechanism is arranged at the end of the sliding arm. Plugs that slide left and right are arranged at both ends of the sliding seat in the lifting and flipping mechanism. One end of the plug also abuts against the front and back sliding inside the sliding seat. A rotating arm that rotates is arranged outside the sliding seat. A stop rod that slides back and forth is arranged at the end of the rotating arm. The plugs are inserted into the lifting holes on both sides of the precast box culvert, and the stop rod abuts against the bottom of the precast box culvert. The telescopic adjustment structure of the lifting device can lift precast box culverts of various sizes. When flipping, the fourth hydraulic cylinder is driven to make the stop rod abut against the bottom of the precast box culvert, so as to push and lift the end of the precast box culvert, which is convenient for the third hydraulic cylinder to drive the plug to withdraw from the lifting hole, so that the precast box culvert can rotate around the plug fixed in the lifting hole due to its own weight. The slow release of the fourth hydraulic cylinder can ensure the stability of the flipping of the precast box culvert.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering hoisting, and particularly relates to a precast culvert turnover telescopic sling and a using method thereof. Background Technique

[0002] In recent years, for the hoisting construction of precast culverts, for precast culverts of different sizes, the main construction processes are as follows: ① The hoisting of precast culverts is divided into two steps: horizontal hoisting and turnover, and usually two types of slings are required. ② Among the existing precast culvert slings, the patent document CN209411599U discloses a turnover sling for precast culvert construction and a precast culvert hoisting construction process. This sling combines the horizontal hoisting and turnover slings into one. The patent document CN215592373U discloses a simple rotary sling for precast culverts. This sling combines the horizontal hoisting and turnover slings into one. For different culverts, the position of the hanging blocks needs to be adjusted manually frequently to complete the hoisting of precast culverts.

[0003] In the above construction, the construction methods of using two types of slings and one type of sling to complete the horizontal hoisting and turnover of precast culverts are the most common precast culvert hoisting construction methods at present. For using two types of slings to complete the hoisting of precast culverts, slings of different sizes need to be processed, the slings need to be replaced frequently, the turnover is poor, the construction efficiency is low, and the construction cost is high; for using one type of sling to complete the hoisting of precast culverts, the position of the hanging blocks needs to be adjusted manually frequently for different culverts, the mechanization degree is not high, and the applicability is poor. Summary of the Invention

[0004] The main purpose of the present invention is to provide a precast culvert turnover telescopic sling and a using method thereof to solve the problems in the above background technique.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: it includes a lifting beam, sliding arms are arranged on both sides of the lifting beam and slide relative to each other. A sliding lifting and turnover mechanism is arranged at the end of the sliding arm. Plug pins that slide left and right are arranged at both ends of the sliding seat in the lifting and turnover mechanism. One end of the plug pin also abuts and slides back and forth in the sliding seat. A rotating arm that rotates is arranged outside the sliding seat. A stop bar that slides back and forth is arranged at the end of the rotating arm.

[0006] The plug pins are inserted into the hanging holes on both sides of the precast culvert, and the stop bar abuts against the bottom of the precast culvert.

[0007] In a preferred solution, the lifting beam is composed of two I-beams. Slide rails are fixedly arranged on both sides of the I-beams. A plurality of sliding sliders are arranged on the slide rails. The sliding arms are arranged between the two I-beams, and the fixing plate at the top of the sliding arm is fixed on the slider.

[0008] In a preferred embodiment, a hoisting connection part is fixedly arranged in the middle of the I-beam, a motor is fixedly arranged on one side of the I-beam, a bidirectional lead screw is arranged between two I-beams, the bidirectional lead screw rotates by abutting against the I-beam through a bearing seat, the motor is connected to the bidirectional lead screw through a driving structure, and a nut sleeve in the sliding arm is in threaded connection with the bidirectional lead screw;

[0009] The motor drives the bidirectional lead screw to rotate through the driving structure, so that the sliding arms on both sides move relatively.

[0010] In a preferred embodiment, a first hinge seat is fixedly arranged at the bottom of the sliding arm, a fixing plate is fixedly arranged at the top, a through nut sleeve is fixedly arranged inside the sliding arm, a first hydraulic cylinder is hinged on the first hinge seat, and guide sleeves are fixedly arranged on both sides of the first hinge seat.

[0011] In a preferred embodiment, a second hinge seat is fixedly arranged in the middle of the sliding seat in the hoisting and flipping mechanism, guide columns are fixedly arranged on both sides of the second hinge seat, the guide columns slide by abutting against the inside of the guide sleeves, and the end of the piston rod of the first hydraulic cylinder is hinged inside the second hinge seat.

[0012] In a preferred embodiment, through chutes are arranged at both ends inside the sliding seat, sliding sleeves are arranged inside the chutes, and pins slide by abutting against the inside of the sliding sleeves.

[0013] In a preferred embodiment, a plurality of threaded holes are arranged on one side of the chute, through holes corresponding thereto are arranged on one side of the sliding sleeve, and the sliding sleeve is fixed by a fixing bolt passing through the through hole and connecting with the threaded hole;

[0014] A plug block in threaded connection is arranged inside the sliding sleeve at one end, and the plug block abuts against and fixes the pin inside the sliding sleeve;

[0015] At the end of the sliding sleeve at the other end, a third hydraulic cylinder is arranged, a connecting sleeve is fixedly arranged between the third hydraulic cylinder and the sliding sleeve, and the end of the piston rod of the third hydraulic cylinder is in threaded connection with the pin.

[0016] In a preferred embodiment, a rotating shaft is arranged to rotate inside the middle of the sliding seat, the end of the rotating arm is sleeved on the rotating shaft, the rotating shaft rotates by abutting against the inside of the sliding seat through a bearing, baffles are fixedly arranged at both ends of the rotating shaft, and the baffles abut against the rotating arm and the bearing inside the sliding seat.

[0017] In a preferred embodiment, a hinge shaft is fixedly arranged on one side of the end of the sliding seat, a fourth hydraulic cylinder is hinged on the hinge shaft, and the end of the piston rod of the fourth hydraulic cylinder is hinged on the rotating arm;

[0018] A second hydraulic cylinder is fixedly arranged on one side of the end of the rotating arm, and the end of the piston rod of the second hydraulic cylinder is in threaded connection with the stop rod.

[0019] The method is as follows: S1. According to the size of the precast culvert, drive the motor to adjust the distance between the lifting beams on both sides, and drive the first hydraulic cylinder to adjust the distance between the hoisting and flipping mechanism and the lifting beams;

[0020] S2, using a lifting device to move the sling to the top of the prefabricated box culvert, and the lower sling to align the latch with the pre-buried lifting hole on the prefabricated box culvert, and the driving motor drives the lifting beam to move relatively, so that the latch is inserted into the lifting hole, and the prefabricated box culvert is lifted by the lifting device;

[0021] S3, lifting the prefabricated box culvert by the lifting device and transferring it to the transportation equipment, and then transporting the prefabricated box culvert to the construction site;

[0022] S4. At the construction site, the prefabricated box culvert needs to be turned over for installation, and the prefabricated box culvert is lifted and moved to the designated location by repeating S2 with the lifting device;

[0023] S5, drive the second hydraulic cylinder to push out the blocking rod, and then drive the fourth hydraulic cylinder to drive the rotating arm to rotate, so that the blocking rod abuts against the bottom of the prefabricated box culvert, thereby pushing up one end of the prefabricated box culvert, and driving the third hydraulic cylinder to withdraw the pin from the lifting hole;

[0024] S6. Slowly releasing the fourth hydraulic cylinder can make the prefabricated box culvert rotate around the pin fixed in the lifting hole by its own weight, so that the prefabricated box culvert is turned 90° and then placed at the designated location by the lifting equipment.

[0025] The present invention provides a prefabricated box culvert retractable hanger and a use method, and the beneficial effects are as follows:

[0026] 1. By adjusting the distance between the sliding arms on both sides and the distance between the lifting and flipping mechanism and the hanging beam, it can be used to lift prefabricated box culverts of different sizes;

[0027] 2. The distance between the sliding pins at both ends of the sliding seat is adjustable, so it can be used for hanging holes of prefabricated box culverts with different spacings;

[0028] 3. During hoisting, the pins on both sides are pressed against the hoisting holes of the prefabricated box culvert, with a total of four hoisting points to ensure the hoisting stability of the prefabricated box culvert;

[0029] 4. When flipping, the fourth hydraulic cylinder drives the blocking rod to rest against the bottom of the prefabricated box culvert, thereby pushing up the end of the prefabricated box culvert, making it easier for the third hydraulic cylinder to drive the pin out of the lifting hole, so that the prefabricated box culvert can rotate around the pin fixed in the lifting hole due to its own weight. The slow release of the fourth hydraulic cylinder can ensure the stability of the flipping of the prefabricated box culvert. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention serving as a prefabricated box culvert;

[0032] Figure 2It is a schematic diagram of the precast box culvert with the overall structure of the present invention overturned;

[0033] Figure 3 It is an axonometric view of the overall structure of the present invention;

[0034] Figure 4 It is an axonometric view of the lifting beam of the present invention;

[0035] Figure 5 It is a top view of the lifting beam of the present invention;

[0036] Figure 6 It is a sectional view taken along line A-A of the present invention;

[0037] Figure 7 It is an axonometric view of the sliding arm of the present invention;

[0038] Figure 8 It is a top view of the hoisting and overturning mechanism of the present invention;

[0039] Figure 9 It is an axonometric exploded view of the hoisting and overturning mechanism of the present invention;

[0040] Figure 10 It is a sectional view taken along line B-B of the present invention;

[0041] Figure 11 It is a sectional view taken along line C-C of the present invention;

[0042] Figure 12 It is a sectional view taken along line D-D of the present invention;

[0043] In the figure: precast box culvert 1; lifting hole 101; lifting beam 2; I-beam 201; slider 202; slide rail 203; hoisting connection part 204; motor 205; bidirectional lead screw 206; sliding arm 3; fixed plate 301; lead screw sleeve 302; guide sleeve 303; first hinge seat 304; first hydraulic cylinder 305; hoisting and overturning mechanism 4; sliding seat 401; guide post 402; second hinge seat 403; rotating arm 404; bolt 405; stop bar 406; second hydraulic cylinder 407; third hydraulic cylinder 408; rotating shaft 409; baffle 410; chute 411; sliding sleeve 412; fixing bolt 413; plug 414; connecting sleeve 415; hinge shaft 416; fourth hydraulic cylinder 417. Detailed implementation manners

[0044] Example 1

[0045] As Figures 1 to 12As shown in the figure, a precast box culvert flipping telescopic lifting device and its usage method include a lifting beam 2. On both sides of the lifting beam 2, there are relatively sliding sliding arms 3. At the end of the sliding arm 3, there is a sliding lifting and flipping mechanism 4. At both ends of the sliding seat 401 in the lifting and flipping mechanism 4, there are left and right sliding pins 405. One end of the pin 405 also abuts against the inner front and back sliding of the sliding seat 401. Outside the sliding seat 401, there is a rotating rotating arm 404. At the end of the rotating arm 404, there is a front and back sliding stop rod 406;

[0046] The pins 405 are inserted into the lifting holes 101 on both sides of the precast box culvert 1, and the stop rods 406 abut against the bottom of the precast box culvert 1. With this structure, two lifting holes 101 are pre-embedded on both sides of the precast box culvert 1. Thus, by the pins 405 abutting against the lifting holes 101, four lifting points are formed, and the precast box culvert 1 can be stably lifted and transferred. The relatively sliding sliding arms 3 and the lifting and flipping mechanism 4 can adjust the size of the lifting device, so as to be applicable to lifting precast box culverts 1 of various sizes. The left and right sliding pins 405 can adjust the spacing, so that the pins 405 can be inserted into the lifting holes 101 with various size spacings. During flipping, the rotating arm 404 rotates so that the stop rod 406 abuts against the bottom of the precast box culvert 1. By the stop rod 406 pushing against the bottom of the precast box culvert 1, the end of the precast box culvert 1 is lifted, so that one end of the pin 405 exits the lifting hole 101, thus forming two parallel lifting points. Centered on the two parallel lifting points, the precast box culvert 1 can be flipped by its own weight. The fourth hydraulic cylinder 417 slowly releases so that the stop rod 406 supports the precast box culvert 1, avoiding the impact caused by the too-fast flipping of the precast box culvert 1.

[0047] In a preferred solution, the lifting beam 2 is composed of two I-beams 201. On both sides of the I-beams 201, there are fixed slide rails 203. On the slide rails 203, there are multiple sliding sliders 202. The sliding arms 3 are arranged between the two I-beams 201. The fixing plate 301 at the top of the sliding arm 3 is fixed on the slider 202. With this structure, the I-beams 201 have good anti-torsion. When lifting the precast box culvert 1, the stability of lifting can be guaranteed. The sliding arm 3 moves by abutting against the slide rail 203 through the slider 202, and the movement is more smooth and reliable. The two I-beams 201 are welded together firmly and reliably, and there is a gap between them. The sliding arm 3 moves in the gap.

[0048] In a preferred solution, a lifting connection part 204 is fixed in the middle of the I-beam 201. A motor 205 is fixed on one side of the I-beam 201. Between the two I-beams 201, there is a bidirectional lead screw 206. The bidirectional lead screw 206 rotates by abutting against the I-beam 201 through a bearing seat. The motor 205 is connected to the bidirectional lead screw 206 through a driving structure. The lead screw sleeve 302 in the sliding arm 3 is threadedly connected to the bidirectional lead screw 206;

[0049] The motor 205 drives the bidirectional lead screw 206 to rotate through a driving structure, so that the sliding arms 3 on both sides move relatively. With this structure, the driving structure can be a gear meshing drive or a sprocket chain drive. In this example, a bevel gear drive is adopted, and the motor 205 drives the bidirectional lead screw 206 to rotate through bevel gears. The two ends of the bidirectional lead screw 206 have threads with opposite helix directions, and the threads are respectively threadedly connected to the lead screw sleeves 302 in the two sliding arms 3. Therefore, when the motor 205 drives the bidirectional lead screw 206 to rotate, the two sliding arms 3 can be driven to move relatively.

[0050] In a preferred embodiment, a first hinge seat 304 is fixedly provided at the bottom of the sliding arm 3, a fixing plate 301 is fixedly provided at the top, a through lead screw sleeve 302 is fixedly provided inside the sliding arm 3, a first hydraulic cylinder 305 is hinged on the first hinge seat 304, and guide sleeves 303 are fixedly provided on both sides of the first hinge seat 304. With this structure, the cylinder barrel of the first hydraulic cylinder 305 is hinged on the first hinge seat 304, and the piston rod is hinged on the hoisting and flipping mechanism 4. Therefore, the hoisting and flipping mechanism 4 can be pushed up and down by the first hydraulic cylinder 305.

[0051] In a preferred embodiment, a second hinge seat 403 is fixedly provided in the middle of the sliding seat 401 in the hoisting and flipping mechanism 4, guide posts 402 are fixedly provided on both sides of the second hinge seat 403, the guide posts 402 are abutted and slide inside the guide sleeves 303, and the end of the piston rod of the first hydraulic cylinder 305 is hinged inside the second hinge seat 403. With this structure, the sliding seat 401 slides by abutting the guide posts 402 inside the guide sleeves 303, and the sliding is smoother and more reliable. The first hydraulic cylinder 305 pushes the sliding seat 401 to slide up and down.

[0052] In a preferred embodiment, through grooves 411 are provided at both ends inside the sliding seat 401, sliding sleeves 412 are provided inside the grooves 411, and the pins 405 are abutted and slide inside the sliding sleeves 412. With this structure, the pins 405 slide by abutting the sliding sleeves 412 inside the grooves 411, so that the distance between the two pins 405 can be adjusted to adapt to the lifting holes 101 with different distances.

[0053] In a preferred embodiment, a plurality of threaded holes are provided on one side of the groove 411, through holes corresponding to them are provided on one side of the sliding sleeve 412, and the sliding sleeve 412 is fixed by a fixing bolt 413 passing through the through hole and connecting with the threaded hole;

[0054] A plug block 414 is provided inside the sliding sleeve 412 at one end, and the plug block 414 abuts and fixes the pin 405 inside the sliding sleeve 412;

[0055] At the end of the sliding sleeve 412 at the other end, a third hydraulic cylinder 408 is provided. A connecting sleeve 415 is fixedly provided between the third hydraulic cylinder 408 and the sliding sleeve 412. The end of the piston rod of the third hydraulic cylinder 408 is threadedly connected to the bolt 405. With this structure, the sliding sleeve 412 is fixed to the sliding groove 411 by the fixing bolt 413. The bolt 405 in the sliding sleeve 412 at one end is the fixed end, and the bolt 405 in the sliding sleeve 412 at the other end is the telescopic end. The bolt 405 at the fixed end is fixed in the sliding sleeve 412 by the plug 414, and the telescopic end bolt 405 is pushed by the third hydraulic cylinder 408 to abut and slide in the connecting sleeve 415 and the sliding groove 411, so that the bolt 405 can be withdrawn from the lifting hole 101.

[0056] In the preferred solution, a rotating shaft 409 is provided inside the middle of the sliding seat 401. The end of the rotating arm 404 is sleeved on the rotating shaft 409. The rotating shaft 409 abuts against the inside of the sliding seat 401 through a bearing and rotates. Baffles 410 are fixedly provided at both ends of the rotating shaft 409. The baffles 410 abut against the bearings in the rotating arm 404 and the sliding seat 401. With this structure, both ends of the rotating shaft 409 abut against the inside of the sliding seat 401 through bearings and rotate. The end of the rotating arm 404 is sleeved on the rotating shaft 409 through a key, and the rotating arm 404 and the rotating shaft 409 are fixed by the baffles 410.

[0057] In the preferred solution, a hinge shaft 416 is fixedly provided on one side of the end of the sliding seat 401. A fourth hydraulic cylinder 417 is hinged on the hinge shaft 416. The end of the piston rod of the fourth hydraulic cylinder 417 is hinged on the rotating arm 404;

[0058] A second hydraulic cylinder 407 is fixedly provided on one side of the end of the rotating arm 404. The end of the piston rod of the second hydraulic cylinder 407 is threadedly connected to the stop bar 406. With this structure, the fourth hydraulic cylinder 417 can push and drive the rotating arm 404 to rotate. Pushing upward can make the stop bar 406 abut against the bottom of the precast box culvert 1 and lift the end of the precast box culvert 1; releasing downward can limit the impact of the self-weight rotation of the precast box culvert 1. The second hydraulic cylinder 407 can push the stop bar 406 in and out of the bottom of the precast box culvert 1. During hoisting, the stop bar 406 retracts into the rotating arm 404, and during flipping, the stop bar 406 is pushed to abut against the bottom of the precast box culvert 1.

[0059] Embodiment 2

[0060] As Figures 1 to 12As shown in the figure, it is further described in combination with Embodiment 1: The method is as follows: According to the size of the precast box culvert 1, the driving motor 205 adjusts the distance between the two lifting beams 2 on both sides, and the first hydraulic cylinder 305 is driven to adjust the distance between the lifting and flipping mechanism 4 and the lifting beam 2; The hoisting equipment is used to move the sling above the precast box culvert 1, and the lower sling is used to align the bolt 405 with the embedded lifting hole 101 on the precast box culvert 1. The driving motor 205 drives the relative movement of the lifting beam 2, so that the bolt 405 is inserted into the lifting hole 101, and the precast box culvert 1 is lifted by the hoisting equipment; The precast box culvert 1 is lifted and transported to the transportation equipment by the sling, and then the precast box culvert 1 is transported to the construction site; At the construction site, the precast box culvert 1 needs to be flipped and installed. The precast box culvert 1 is lifted and moved to the designated location by repeating S2 with the sling; The second hydraulic cylinder 407 is driven to eject the stop bar 406, and then the fourth hydraulic cylinder 417 is driven to drive the rotating arm 404 to rotate, so that the stop bar 406 abuts against the bottom of the precast box culvert 1, thereby pushing up one end of the precast box culvert 1. The third hydraulic cylinder 408 is driven to withdraw the bolt 405 from the lifting hole 101; Slowly releasing the fourth hydraulic cylinder 417 allows the precast box culvert 1 to rotate around the bolt 405 fixed in the lifting hole 101 by its own weight, so that the precast box culvert 1 is flipped by 90°, and then placed at the designated location by the hoisting equipment.

[0061] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as a limitation to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A precast box culvert flipping and telescopic lifting device, characterized in that: It includes a suspension beam (2). On both sides of the suspension beam (2), there are sliding arms (3) that slide relative to each other. At the end of the sliding arm (3), there is a sliding hoisting and flipping mechanism (4). At both ends of the sliding seat (401) in the hoisting and flipping mechanism (4), there are pins (405) that slide left and right. One end of the pin (405) also abuts and slides back and forth inside the sliding seat (401). Outside the sliding seat (401), there is a rotating arm (404) that rotates. At the end of the rotating arm (404), there is a rod (406) that slides back and forth; The pin (405) is inserted into the lifting holes (101) on both sides of the precast box culvert (1), and the rod (406) abuts against the bottom of the precast box culvert (1); At the bottom of the sliding arm (3), there is a fixedly installed first hinge seat (304). At the top, there is a fixed plate (301). Inside the sliding arm (3), there is a through-threaded sleeve (302). On the first hinge seat (304), there is a hinged first hydraulic cylinder (305). On both sides of the first hinge seat (304), there are fixedly installed guide sleeves (303); In the hoisting and flipping mechanism (4), in the middle of the sliding seat (401), there is a fixedly installed second hinge seat (403). On both sides of the second hinge seat (403), there are fixedly installed guide columns (402). The guide columns (402) abut and slide inside the guide sleeves (303). The piston rod end of the first hydraulic cylinder (305) is hinged inside the second hinge seat (403); At both ends inside the sliding seat (401), there are through-chutes (411). Inside the chutes (411), there are sliding sleeves (412). The pin (405) abuts and slides inside the sliding sleeve (412); On one side of the chute (411), there are multiple threaded holes. On one side of the sliding sleeve (412), there are corresponding through-holes. The sliding sleeve (412) is fixed by a fixing bolt (413) passing through the through-hole and connecting with the threaded hole; Inside the sliding sleeve (412) at one end, there is a plug (414) connected by threads. The plug (414) abuts and fixes the pin (405) inside the sliding sleeve (412); At the end of the sliding sleeve (412) at the other end, there is a third hydraulic cylinder (408). Between the third hydraulic cylinder (408) and the sliding sleeve (412), there is a connecting sleeve (415). The piston rod end of the third hydraulic cylinder (408) is connected by threads to the pin (405).

2. The precast box culvert flipping and telescopic lifting device according to claim 1, wherein: The suspension beam (2) is composed of two I-beams (201). On both sides of the I-beam (201), there are fixedly installed slide rails (203). On the slide rails (203), there are multiple sliding sliders (202). The sliding arm (3) is arranged between the two I-beams (201). The fixed plate (301) at the top of the sliding arm (3) is fixed on the slider (202); 3. The telescopic sling for a precast culvert with a turnover function according to claim 2, characterized in that: In the middle of the I-beam (201), there is a fixedly installed hoisting connection part (204). On one side of the I-beam (201), there is a motor (205). Between the two I-beams (201), there is a bidirectional lead screw (206). The bidirectional lead screw (206) abuts and rotates on the I-beam (201) through a bearing seat. The motor (205) is connected to the bidirectional lead screw (206) through a drive structure. The threaded sleeve (302) inside the sliding arm (3) is threadedly connected to the bidirectional lead screw (206); The motor (205) drives the bidirectional lead screw (206) to rotate through a driving structure, so that the sliding arms (3) on both sides move relatively.

4. The retractable spreader for precast culvert with turnover function according to claim 1, characterized in that: A rotating shaft (409) is arranged inside the middle of the sliding seat (401). The end of the rotating arm (404) is sleeved on the rotating shaft (409). The rotating shaft (409) rotates by abutting against the bearing inside the sliding seat (401) through a bearing. Baffles (410) are fixedly arranged at both ends of the rotating shaft (409), and the baffles (410) abut against the rotating arm (404) and the bearing inside the sliding seat (401).

5. The precast culvert turnover telescopic spreader according to claim 4, characterized in that: One side of the end of the sliding seat (401) is fixedly provided with a hinge shaft (416). A fourth hydraulic cylinder (417) is hinged on the hinge shaft (416). The end of the piston rod of the fourth hydraulic cylinder (417) is hinged on the rotating arm (404). One side of the end of the rotating arm (404) is fixedly provided with a second hydraulic cylinder (407). The end of the piston rod of the second hydraulic cylinder (407) is threadedly connected with the stop bar (406).

6. The using method of a precast box culvert flipping and telescopic lifting device according to any one of claims 1 to 5, the method is: S1. According to the size of the precast box culvert (1), drive the motor (205) to adjust the distance between the lifting beams (2) on both sides, and drive the first hydraulic cylinder (305) to adjust the distance between the lifting and flipping mechanism (4) and the lifting beam (2); S2. Use a lifting device to move the lifting device above the precast box culvert (1), lower the lifting device, so that the plug pin (405) is aligned with the embedded lifting hole (101) on the precast box culvert (1), drive the motor (205) to drive the lifting beam (2) to move relatively, so that the plug pin (405) is inserted into the lifting hole (101), and lift the precast box culvert (1) through the lifting device; S3. Lift and transport the precast box culvert (1) to a transport device through this lifting device, and then transport the precast box culvert (1) to the construction site; S4. When the precast box culvert (1) needs to be flipped and installed at the construction site, lift the precast box culvert (1) to a designated location by repeating S2 through the lifting device; S5. Drive the second hydraulic cylinder (407) to eject the stop bar (406), and then drive the fourth hydraulic cylinder (417) to drive the rotating arm (404) to rotate, so that the stop bar (406) abuts against the bottom of the precast box culvert (1), so as to push up one end of the precast box culvert (1), and drive the third hydraulic cylinder (408) to withdraw the plug pin (405) from the lifting hole (101); S6. Slowly release the fourth hydraulic cylinder (417), so that the precast box culvert (1) can rotate around the plug pin (405) fixed in the lifting hole (101) by its own weight, so that the precast box culvert (1) is flipped by 90°, and then placed at a designated location through the lifting device.

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