A vehicle girder lateral straightening machine

Abstract

The present application relates to the technical fields of automobile beam repair, and discloses a lateral straightening machine for automobile beam, which comprises a machine table, a plurality of limiting support frames are detachably fixed on the machine table, the limiting support frames are used for supporting the beam to be repaired, a lateral jacking mechanism is further installed on the machine table, and the lateral jacking mechanism is used for straightening the beam to be repaired; sliding rail grooves are formed on the two sides of the machine table, the bottom of the limiting support frame is slidingly installed on the sliding rail grooves, the limiting support frame comprises a base, a vertical stand is vertically fixed on the base, a limiting groove is formed on the vertical stand, a limiting plate is slidingly installed in the limiting groove, and a hydraulic lifting rod is connected between the limiting plate and the bottom of the limiting groove; in the embodiment, the lateral jacking mechanism is arranged to straighten the curved automobile beam, the limiting support frame is arranged to limit the automobile beam to be repaired, and the lateral jacking mechanism is cooperated with the limiting support frame to prevent displacement during the lateral jacking straightening of the automobile beam.

Description

Technical Field

[0001] This invention relates to the field of automotive frame repair technology, specifically to an automotive frame lateral straightening machine. Background Technology

[0002] The car frame, also known as the chassis, is an important component of a car. When a car is damaged, the frame is prone to bending due to impact. Achieving good straightening of the car frame can greatly reduce the repair cost after a car is damaged and avoid scrapping the entire frame. Therefore, how to straighten the car frame laterally has become an important part of car repair.

[0003] Current automotive frame repair methods are still in a relatively rudimentary state. For example, longitudinal beams are welded together, and hydraulic jacks are installed on the sides of the longitudinal beams, aligning them with the side bends. The jacks are then used to gradually straighten the automotive frame. However, there are some drawbacks in this process. For instance, the automotive frame lacks appropriate limiters during the straightening process with hydraulic jacks, making it prone to displacement. This causes the angle between the hydraulic jacks and the side bends to shift during straightening, ultimately affecting the success rate of straightening. Summary of the Invention

[0004] The purpose of this invention is to provide a lateral straightening machine for automobile beams, which solves the technical problem that the automobile beam lacks corresponding limiting points during the straightening process using hydraulic jacks, making it prone to displacement. This causes the angle between the hydraulic jack and the lateral bend to deviate during the straightening process, ultimately affecting the success rate of straightening.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A side straightening machine for automobile beams includes a machine base, on which multiple limiting support frames are detachably fixed, the limiting support frames being used to support the beam to be repaired, and a side top mechanism is also installed on the machine base, the side top mechanism being used to straighten the beam to be repaired;

[0007] The machine base has slide rail grooves on both sides. The bottom of the limiting support frame is slidably installed on the slide rail groove. The limiting support frame includes a base, on which a vertical frame is fixed. A limiting groove is opened on the vertical frame. A limiting plate is slidably installed in the limiting groove. A hydraulic lifting rod is connected between the limiting plate and the bottom of the limiting groove. Multiple positioning holes are equidistantly arranged on one side of the slide rail groove. A through hole is opened on the base. When the positioning holes and the through hole are concentric, they are fixed by positioning components.

[0008] Furthermore, the side-top mechanism includes a gantry fixed to the machine platform. Multiple hydraulic lifting columns are provided in the middle of the gantry, and the bottom of the multiple hydraulic lifting columns is fixed to the beam. Electric slide rails are provided on both sides of the beam, and hydraulic top columns are installed on the electric slide rails. A telescopic mechanism is provided between two limit support frames located in the middle of the same slide rail groove.

[0009] Furthermore, the telescopic mechanism includes a lead screw with opposite rotation directions on both sides. The base includes a slide block, which is slidably mounted in a displacement groove on the base. The upright is mounted on the slide block, and a reinforcing member is provided between the upright and the slide block. The lead screw and the slide block are connected by a helical drive. A first bevel gear is fixed on the lead screw, and the first bevel gear meshes with a second bevel gear. The second bevel gear is fixed to the side end of the cylinder. The cylinder is rotatably mounted on one of the bases. A reciprocating helical groove is formed on the outer surface of the cylinder. An electric telescopic rod is provided between the two cylinders. The bottom of the electric telescopic rod slides on a sliding plate. The slide rod is fixedly connected to the base. The end of the electric telescopic rod is slidably connected in the reciprocating helical groove. A docking assembly is provided on the cylinder of the electric telescopic rod. The docking assembly is used to detachably and fixedly connect the cylinder of the electric telescopic rod to the telescopic end of the hydraulic jack.

[0010] Furthermore, the docking assembly includes: a column, the bottom end of which is fixedly disposed in the middle of the cylinder of the electric telescopic rod; two grippers are hinged to the top of the column, the two grippers are symmetrically arranged, and connecting rods are hinged to the opposite side walls of the two grippers by torsion springs; a transition rod is hinged between the two connecting rods; a locking pin is fixed to the opposite side walls of the two grippers; a connecting block is fixedly disposed on the column body of the hydraulic jack, and grooves are provided on both sides of the connecting block, the grooves corresponding to the positions of the locking pins.

[0011] Furthermore, the column has a rectangular cross-section and is a telescopic structure, comprising an upper column and a lower column. The lower column has a movable groove at its top, and the upper column is slidably connected within the movable groove. A support spring is provided at the bottom of the movable groove.

[0012] Furthermore, the top of the hydraulic jack is provided with an adapter component, which is used to adapt to different curvatures at the bending points of the vehicle beam.

[0013] Furthermore, the adapter component includes a top block with an embedded groove in the center of the side of the top block facing the vehicle frame. A hydraulic telescopic rod is fixedly installed in the embedded groove, and a hinge column is rotatably connected to the end of the hydraulic telescopic rod. Two support members are symmetrically arranged, with one end of each support member movably connected to the hinge column and the other end hinged to the support frame. The other end of the support frame is hinged to the side of the top block. By extending the hydraulic telescopic rod, the distance between the hinge column and the side of the top block is increased, thereby adjusting the angle between the two support members.

[0014] The beneficial effects of this invention are:

[0015] (1) By setting up the docking component, the present invention can, on the one hand, use the extension action of the hydraulic jack to drive the distance between the two support structure parts to shrink synchronously, so as to achieve stronger support for the bending point; on the other hand, it can quickly switch the connection state between the hydraulic jack and the electric telescopic rod cylinder according to the working state of the hydraulic jack, without the need to set up an additional connection mechanism, which is free and flexible and highly practical.

[0016] (2) On the one hand, the present invention realizes the automatic retraction of the two grippers by the downward movement of the hydraulic jack, thereby realizing the automatic connection between the connecting block and the column, which is convenient and quick; on the other hand, the telescopic structure of the column compensates for the downward movement distance of the hydraulic jack, forming a process of first clamping and connecting with the grippers and then continuing to press down the column, so as to achieve the effect that the lower the height of the hydraulic jack, the lower the height of the column and the stronger the structural strength.

[0017] (3) By setting the adapter components, the present invention can increase the contact area when the side is topped, and prevent local deformation caused by excessive local pressure. On the other hand, by dynamically adjusting the included angle between the two support members, it can adapt to the changes in the bending of the beam during the side straightening process, always maintain a large support area, enhance the straightening effect, and adapt to the deformation straightening action of different bending degrees, with a wide range of applications. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is an overall schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional schematic diagram of the docking component in this invention;

[0021] Figure 3 This is a top view of the telescopic mechanism in this invention.

[0022] Figure 4 This is a top view of the adapter component in this invention;

[0023] Figure 5 for Figure 4 The main view.

[0024] Attached Figure Descriptions: 1. Machine base; 2. Limiting support frame; 21. Base; 22. Stand; 23. Limiting groove; 24. Limiting plate; 25. Hydraulic lifting rod; 26. Positioning hole; 27. Positioning component; 28. Reinforcing component; 29. ​​Through hole; 3. Side top mechanism; 31. Gantry; 32. Hydraulic lifting column; 33. Beam; 34. Electric slide rail; 35. Hydraulic top column; 4. Slide rail groove; 5. Telescopic mechanism; 51. Lead screw; 52. Slide seat; 53. Displacement groove; 54. First bevel gear; 55. Second bevel gear. 56. Bevel gear; 57. Cylindrical body; 58. Electric telescopic rod; 59. Slide plate; 50. Docking assembly; 591. Column; 5911. Upper column; 5912. Lower column; 5913. Movable groove; 5914. Support spring; 592. Gripper; 593. Connecting rod; 594. Transition rod; 595. Locking post; 596. Connecting block; 597. Groove; 60. Adaptor assembly; 61. Top block; 62. Embedded groove; 63. Hydraulic telescopic rod; 64. Hinge post; 65. Support component; 66. Support frame. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-5 As shown, the present invention is a lateral straightening machine for automobile beams, including a machine base 1, on which multiple limiting support frames 2 are detachably fixed, the limiting support frames 2 being used to support the beam to be repaired, and a side top mechanism 3 is also installed on the machine base 1, the side top mechanism 3 being used to straighten the beam to be repaired.

[0027] The machine base 1 has slide rail grooves 4 on both sides. The bottom of the limiting support frame 2 is slidably installed on the slide rail grooves 4. The limiting support frame 2 includes a base 21. A stand 22 is vertically fixed on the base 21. A limiting groove 23 is opened on the stand 22. A limiting plate 24 is slidably installed in the limiting groove 23. A hydraulic lifting rod 25 is connected between the limiting plate 24 and the bottom of the limiting groove 23. A plurality of positioning holes 26 are equidistantly arranged on one side of the slide rail groove 4. A through hole 29 is opened on the base 21. When the positioning hole 26 and the through hole 29 are concentric, they are fixed by a positioning member 27.

[0028] In this embodiment, a side-top mechanism 3 is used to straighten a bent car beam. A limiting support frame 2 is used to limit the car beam to be repaired and works with the side-top mechanism 3 to prevent displacement during the side-top straightening process. Specifically, the car beam is placed on the machine base 1, and the limiting support frame 2 is moved according to the position of the bent part of the car beam until the limiting support frame 2 is on both sides of the bent part. Then, the limiting support frame 2 is fixed on the machine base 1 by the positioning component 27 to achieve the positioning of the car beam. Then, the hydraulic lifting column 32 pushes the limiting plate 24 upward until the limiting plate 24 contacts the bottom surface of the car beam, thereby achieving the overall support of the car beam and maintaining its stability. The upright frame 22 of the limiting support frame 2 can limit the left and right sides of the car beam, preparing for the subsequent straightening of the bent part of the car beam by the side-top mechanism 3.

[0029] The side-top mechanism 3 includes a gantry 31, which is fixed on the machine base 1. Multiple hydraulic lifting columns 32 are provided in the middle of the gantry 31. The bottom of the multiple hydraulic lifting columns 32 is fixed to the beam 33. Electric slide rails 34 are provided on both sides of the beam 33. Hydraulic top columns 35 are installed on the electric slide rails 34. A telescopic mechanism 5 is provided between two limit support frames 2 located in the middle of the same slide rail groove 4.

[0030] In this embodiment, the side-mounted mechanism 3 is designed to straighten the bends at different locations on the vehicle beam. Specifically, after the vehicle beam is supported, the hydraulic lifting column 32 in the middle of the mast 31 extends downwards, pushing the bottom beam 33 downwards. This causes the hydraulic jacks 35 mounted on the beam 33 to move to a height corresponding to the vehicle beam. Then, the electric slide rail 34 controls the hydraulic jacks 35 on both sides to move to the bends of the vehicle beam. One hydraulic jack 35 extends and contacts the bend of the vehicle beam, while the other hydraulic jack 35 presses against the other side of the vehicle beam. The two hydraulic jacks 35 can simultaneously straighten the bends on both sides of the vehicle beam. The straightening action is highly efficient. In practice, it only requires extending the hydraulic jack 35. Since the initial part of the bend is relatively large, the range of the bend gradually decreases as the straightening process progresses. Therefore, to prevent excessive lateral jacking of the hydraulic jack 35 from causing the car frame to bend to the other side, a telescopic mechanism 5 is provided. This allows the limiting support frames 2 on both sides of the bend to gradually move closer together as the hydraulic jack 35 extends, always maintaining effective support for the bend of the car frame. Furthermore, the two limiting support frames 2 connected by the telescopic mechanism 5 form a connection, allowing them to move together for different bend positions. This is faster than the individual movement of the dispersed limiting support members 65.

[0031] The telescopic mechanism 5 includes a lead screw 51 with opposite rotation directions on both sides. The base 21 includes a slide 52, which is slidably mounted in a displacement groove 53 on the base 21. The upright frame 22 is mounted on the slide 52, and a reinforcing member 28 is provided between the upright frame 22 and the slide 52. The lead screw 51 and the slide 52 are connected by a helical drive. A first bevel gear 54 is fixed on the lead screw 51, and the first bevel gear 54 meshes with a second bevel gear 55. The second bevel gear 55 is fixed to the side end of the cylinder 56. A cylindrical body 56 is rotatably mounted on one of the bases 21. The outer surface of the cylindrical body 56 is provided with a reciprocating spiral groove. An electric telescopic rod 57 is provided between the two cylindrical bodies 56. The bottom of the electric telescopic rod 57 is limited to slide on a sliding plate 58. The sliding rod is fixedly connected to the base 21. The end of the electric telescopic rod 57 is slidably connected in the reciprocating spiral groove. A docking assembly 59 is provided on the cylinder of the electric telescopic rod 57. The docking assembly 59 is used to detachably and fixedly connect the cylinder of the electric telescopic rod 57 to the telescopic end of the hydraulic jack 35.

[0032] In this embodiment, a specific structure of the telescopic mechanism 5 is provided to achieve synchronous changes in the distance between the two sliding blocks 52 and the extension distance of the hydraulic jack 35, thereby enabling the side-mounted straightening of the vehicle beam while maintaining effective support for the bending points of the vehicle beam. Specifically, during use, when the hydraulic jack 35 extends, due to the arrangement of the docking component 59, a connection is established between the column of the hydraulic jack 35 and the cylinder of the electric telescopic column. Then, the extension action of the hydraulic jack 35 drives the end of the electric telescopic rod 57 to move synchronously. Since the end of the electric telescopic rod 57 is inserted into the reciprocating spiral groove on the outside of the cylinder 56, the linear movement of the electric telescopic rod 57 is converted into the rotation of the cylinder 56. The cylinder 56 drives the second bevel gear 55 to rotate. The second bevel gear 55 and the first bevel gear... Under the meshing action of 54, the first bevel gear 54 drives the lead screw 51 to rotate. The lead screw 51 and the slide 52 form a ball screw pair. Therefore, the two slides 52 and the supporting structure move synchronously towards the center, ultimately realizing the synchronous change of the distance between the two supporting structure parts and the extension distance of the hydraulic jack 35. This allows the side to straighten the car beam while maintaining effective support for the curved part of the car beam. Through the setting of the docking component 59, this invention can, on the one hand, use the extension action of the hydraulic jack 35 to drive the distance between the two supporting structure parts to decrease synchronously, thereby achieving stronger support for the curved part. On the other hand, it can quickly switch the connection state between the hydraulic jack 35 and the cylinder of the electric telescopic rod 57 according to the working state of the hydraulic jack 35, without the need for an additional connection mechanism, making it free, flexible and highly practical.

[0033] Further, the docking assembly 59 includes: a column 591, the bottom end of which is fixedly disposed in the middle of the cylinder of the electric telescopic rod 57; two grippers 592 are hinged to the top of the column 591, the two grippers 592 are symmetrically arranged, and a connecting rod 593 is hinged to the opposite side wall of each of the two grippers 592 by a torsion spring; a transition rod 594 is hinged between the two connecting rods 593; a locking post 595 is fixedly disposed on the opposite side wall of each of the two grippers 592; a connecting block 596 is fixedly disposed on the column of the hydraulic jack 35; grooves 597 are provided on both sides of the connecting block 596, and the grooves 597 correspond to the positions of the locking posts 595. The column 591 has a rectangular cross-section and is a telescopic structure, including an upper column 5911 and a lower column 5912. The lower column 5912 has a movable groove 5913 at its top, and the upper column 5911 is slidably connected in the movable groove 5913. A support spring 5914 is provided at the bottom of the movable groove 5913.

[0034] In this embodiment, the hydraulic jack 35, moving downwards with the beam 33, presses down on the transition rod 594 and the connecting rod 593. Since the transition rod 594 and the connecting rod 593 are hinged, the two grippers 592 are forced inwards until they are fully retracted. At this point, the locking pin 595 inside the gripper 592 is precisely engaged in the groove 597 within the connecting block 596, achieving assembly between the locking pin 595 and the groove 597. If the hydraulic jack 35 continues to move downwards, it will press the upper column 5911 to overcome the elastic force of the support spring 5914 and continue moving downwards until the hydraulic jack 35 reaches its final position. At this point, a stable connection is formed between the grippers 592 and the connecting block 596. When the hydraulic jack 35 continues to extend, the fixedly connected connecting block 596... The cylinder of the electric telescopic rod 57 is moved by the column 591, and the lead screw 51 is rotated by the transmission of the cylinder 56, the electric telescopic rod 57, the first bevel gear 54 and the second bevel gear 55. This causes the distance between the two sliding blocks 52 to decrease synchronously, gradually approaching the bend and achieving stronger support. The invention achieves the automatic retraction of the two grippers 592 by the downward movement of the hydraulic jack 35, thereby achieving the automatic connection between the connecting block 596 and the column 591, which is convenient and quick. On the other hand, the telescopic structure of the column 591 compensates for the downward movement of the hydraulic jack 35, forming a process of first clamping and connecting with the grippers 592 and then continuing to press down on the column 591. This achieves the effect that the lower the height of the hydraulic jack 35 and the lower the height of the column 591, the stronger the structure.

[0035] The top of the hydraulic jack 35 is provided with an adapter component 6, which is used to adapt to different curvatures at the bending points of the vehicle beam. The adapter component 6 includes a jack 61, and an embedding groove 62 is provided in the middle of the side of the jack 61 facing the vehicle beam. A hydraulic telescopic rod 63 is fixedly installed in the embedding groove 62. A hinge column 64 is rotatably connected to the end of the hydraulic telescopic rod 63. Two support members 65 are symmetrically arranged. One end of each support member 65 is movably connected to the hinge column 64, and the other end is hinged to the support frame 66. The other end of the support frame 66 is hinged to the side of the jack 61. By extending the hydraulic telescopic rod 63, the distance between the hinge column 64 and the side of the jack 61 is increased, thereby adjusting the angle between the two support members 65.

[0036] In this embodiment, an adapter component 6 is provided at the end of the hydraulic jack 35 to solve the problem that the contact area between the hydraulic jack 35 and the main beam is too small, which can easily lead to excessive local pressure and cause the main beam to dent and deform during the process of forcibly straightening the vehicle main beam. In use, the hinge column 64 is kept facing the center line of the bend, and then the hydraulic telescopic rod 63 is gradually extended according to the shape of the bend, so that the hinge column 64 moves outward and the support members 65 on both sides unfold to both sides until the included angle between the two support members 65 is adapted to the bend. At this time, the hinge column 64 in the middle and the sides of the support members 65 can be aligned with the bend. The design maximizes the contact area, preventing excessive local pressure and deformation during side-mounted straightening, resulting in better straightening of the car frame after repair. The invention, through the adaptation component 6, increases the contact area during side-mounted straightening, preventing localized deformation due to excessive local pressure. Furthermore, the dynamic adjustment of the angle between the two support members 65 adapts to changes in the beam's curvature during side-mounted straightening, maintaining a large support area and enhancing the straightening effect. It can also adapt to straightening actions with varying degrees of curvature, making it widely applicable.

[0037] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A lateral straightening machine for automobile beams, comprising a machine base (1), characterized in that, The machine base (1) is detachably fixed with multiple limiting support frames (2), which are used to support the beam to be repaired. The machine base (1) is also equipped with a side top mechanism (3), which is used to straighten the beam to be repaired. The machine base (1) has slide rail grooves (4) on both sides. The bottom of the limiting support frame (2) is slidably installed on the slide rail groove (4). The limiting support frame (2) includes a base (21). A stand (22) is vertically fixed on the base (21). A limiting groove (23) is opened on the stand (22). A limiting plate (24) is slidably installed in the limiting groove (23). A hydraulic lifting rod (25) is connected between the limiting plate (24) and the bottom of the limiting groove (23). Multiple positioning holes (26) are equidistantly arranged on one side of the slide rail groove (4). A through hole (29) is opened on the base (21). When the positioning hole (26) and the through hole (29) are concentric, they are fixed by a positioning component (27). The side top mechanism (3) includes a gantry (31), which is fixed on the machine base (1). Multiple hydraulic lifting columns (32) are provided in the middle of the gantry (31). The bottom of the multiple hydraulic lifting columns (32) is fixed to the beam (33). Electric slide rails (34) are provided on both sides of the beam (33). Hydraulic top columns (35) are installed on the electric slide rails (34). A telescopic mechanism (5) is provided between two limit support frames (2) located in the middle of the same slide rail groove (4). The telescopic mechanism (5) includes a lead screw (51) with opposite rotation directions on both sides. The base (21) includes a slide (52) which is slidably mounted in a displacement groove (53) on the base (21). The upright (22) is mounted on the slide (52), and a reinforcing member (28) is provided between the upright (22) and the slide (52). The lead screw (51) and the slide (52) are connected by a helical drive. A first bevel gear (54) is fixed on the lead screw (51), and the first bevel gear (54) meshes with a second bevel gear (55). The second bevel gear (55) is fixed to the cylinder (56). At the side end, the cylinder (56) is rotatably mounted on one of the bases (21). The outer surface of the cylinder (56) is provided with a reciprocating spiral groove. An electric telescopic rod (57) is provided between the two bases (21). The bottom of the electric telescopic rod (57) is limited to sliding on the slide plate (58). The slide plate (58) is fixedly connected to the base (21). The end of the electric telescopic rod (57) is slidably connected in the reciprocating spiral groove. A docking assembly (59) is provided on the cylinder of the electric telescopic rod (57). The docking assembly (59) is used to detachably and fixedly connect the cylinder of the electric telescopic rod (57) to the telescopic end of the hydraulic jack (35).

2. The lateral straightening machine for automobile beams according to claim 1, characterized in that, The docking assembly (59) includes: a column (591), the bottom end of which is fixedly disposed in the middle of the cylinder of the electric telescopic rod (57), and two grippers (592) are hinged to the top of the column (591). The two grippers (592) are symmetrically arranged, and a connecting rod (593) is hinged to the opposite side wall of the two grippers (592) by a torsion spring. A transition rod (594) is hinged between the two connecting rods (593). A locking post (595) is fixed on the opposite side wall of the two grippers (592). A connecting block (596) is fixedly disposed on the column of the hydraulic jack (35). Grooves (597) are opened on both sides of the connecting block (596), and the grooves (597) correspond to the positions of the locking posts (595).

3. The lateral straightening machine for automobile beams according to claim 2, characterized in that, The column (591) has a rectangular cross-section and is a telescopic structure, including an upper column (5911) and a lower column (5912). The lower column (5912) has a movable groove (5913) at its top, and the upper column (5911) is slidably connected in the movable groove (5913). The movable groove (5913) has a support spring (5914) at its bottom.

4. The lateral straightening machine for automobile beams according to claim 1 or 3, characterized in that, The top of the hydraulic jack (35) is provided with an adapter component (6), which is used to adapt to different curvatures at the bending points of the automobile beam.

5. The lateral straightening machine for automobile beams according to claim 4, characterized in that, The adapter component (6) includes a top block (61), and an embedding groove (62) is provided in the middle of the side of the top block (61) facing the car frame. A hydraulic telescopic rod (63) is fixedly installed in the embedding groove (62). A hinge column (64) is rotatably connected to the end of the hydraulic telescopic rod (63). Two support members (65) are symmetrically arranged. One end of each support member (65) is movably connected to the hinge column (64), and the other end is hinged to the support frame (66). The other end of the support frame (66) is hinged to the side of the top block (61).

6. The lateral straightening machine for automobile beams according to claim 5, characterized in that, By extending the hydraulic telescopic rod (63), the distance between the hinge column (64) and the side of the top block (61) is adjusted, thereby adjusting the angle between the two support members (65).

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