A straightening machine outlet guide straightening device

Abstract

This invention relates to a guide straightening device for the outlet of a straightening machine, comprising a base housing and several guide straightening groups arranged in a front-to-back direction mounted on the base housing. Each guide straightening group includes two guide straightening units arranged opposite each other in a left-to-right direction, forming a guide straightening channel between the left and right guide straightening units. Each guide straightening unit includes a guide seat slidably connected to the base housing and a drive mechanism for driving the guide seat to move left and right. A guide wheel rotatably mounted on a guide wheel shaft is provided on the side of the guide seat facing the guide straightening channel. At least two straight sections are provided on the upper and lower ends of the guide wheel shaft. The bottom of the guide seat is provided with a support groove adapted to the lower end of the guide wheel shaft. The guide wheel shaft of this invention is installed via a notch and a support groove, facilitating the installation and removal of the guide wheel shaft, improving the efficiency of turning the guide wheel up and down, and utilizing the bottom of the notch and the sidewall of the support groove to form lateral support for the guide wheel shaft at two points, preventing the guide wheel shaft from tilting.

Description

Technical Field

[0001] This invention relates to the field of steel profile guiding and straightening technology, and more particularly to the guiding and straightening of a track steel straightening machine, specifically referring to a straightening machine outlet guiding and straightening device. Background Technology

[0002] In the production of structural steel, straightening is an important finishing process that determines the final quality and precision of the product.

[0003] Currently, section steel straightening mainly employs multi-roll straighteners. By applying external force, the section steel undergoes plastic deformation, thereby eliminating its original bending and twisting. Taking a nine-roll straightener for straightening track steel as an example, when the rolled piece passes through the roll gap formed by two rows of staggered straightening rolls, it is repeatedly bent and gradually straightened. Because track steel typically has a large width and thickness, and mainly bears horizontal forces during use, the design of straighteners usually focuses on the straightening effect in the horizontal direction.

[0004] With the expansion of production scale and the increasing demands of users for product quality, straightening technology plays an increasingly important role in the production of profile steel. In actual production, compared with H-beams, track steel has a lower yield rate, only about 93%, and most of it is due to the track steel not meeting the requirements for straightness in the vertical direction, i.e., lateral bending.

[0005] Currently, straightening machines are generally equipped with guiding devices at the outlet, but these devices mainly serve to guide the rolled pieces. However, existing guiding devices have the following shortcomings during use:

[0006] 1. When producing track steel, the guide wheel of the guide device has a small contact area with the track steel, which leads to accelerated wear of the guide wheel and frequent replacement of the guide wheel. The current guide device is complicated to operate when replacing the guide wheel and requires the machine to be stopped, which not only affects the production rhythm, but also increases production costs and labor intensity.

[0007] 2. In the existing guide device, the lower end of the guide wheel axle is fixed during installation. During production, the guide wheel is prone to skew due to the extrusion pressure of the rolled workpiece, which causes the rolled workpiece to bend to the side.

[0008] 3. When producing profiles of different specifications, the position of the guide wheels needs to be adjusted manually, which is inefficient and labor-intensive.

[0009] 4. During the guiding process, the iron oxide scale falls off when it comes into contact with the guide wheel, resulting in the accumulation of iron oxide scale on the rolled piece. Cleaning the iron oxide scale is time-consuming and labor-intensive. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a guide straightening device for the outlet of a straightening machine. This device can not only guide the track steel after straightening by the straightening machine, but also perform lateral straightening to prevent side bending.

[0011] This invention is achieved through the following technical solution: a guide straightening device for the outlet of a straightening machine is provided, comprising a base housing and a plurality of guide straightening groups arranged in a front-to-back direction on the base housing. Each guide straightening group includes two guide straightening units arranged opposite each other in a left-to-right direction, with a guide straightening channel formed between the left and right guide straightening units. Each guide straightening unit includes a guide seat that slides with the base housing and a drive mechanism that drives the guide seat to move in a left-to-right direction. The guide seat has a guide wheel rotatably mounted on a guide wheel shaft on the side facing the guide straightening channel. The axis of the guide wheel shaft extends vertically, and at least two straight sections are provided on the upper and lower wheel surfaces of the guide wheel shaft. The bottom of the guide seat has a support groove adapted to the lower end of the guide wheel shaft, and the top of the guide seat has a notch adapted to the upper end of the guide wheel shaft, with the opening of the notch facing the side where the guide straightening channel is located.

[0012] This design integrates the entire guiding and straightening device into a single unit by setting up a base housing, facilitating overall installation and relocation. A guiding and straightening channel is formed between the two opposing guide wheels. The track plates output from the straightening machine pass through this channel. The position of the guide wheels is adjusted via a drive mechanism, allowing them to provide a guiding channel for the track plates while simultaneously straightening any lateral bends. The drive mechanism also improves the efficiency of adjusting the guide wheel position and provides sufficient thrust to ensure the straightening effect. The guide wheel shaft is mounted on the guide seat via support grooves and notches, facilitating switching between the upper and lower ends of the guide wheel. When the lower part of the guide wheel wears to a certain extent, it can be easily removed from the guide seat for installation.

[0013] As an optimization, the guide seat includes a top plate, a bottom plate, and two side plates located between the top and bottom plates and arranged opposite each other. A first reinforcing plate is provided between the side plates. The top plate, side plates, first reinforcing plate, and bottom plate are welded together. The outer side of the side plates has guide grooves extending in the left-right direction. A guide plate adapted to the guide grooves is fixed on the base box. The notch is opened on the top plate, and the support groove extends downward from the upper surface of the bottom plate. The guide seat structure of this optimized solution is simple. The structural strength is improved by setting the first reinforcing plate, and the stability of the guide seat movement is improved by setting the guide grooves on the side plates. The position setting of the notch and support groove facilitates processing and reduces manufacturing difficulty.

[0014] As an optimization, the distance between the guide wheel and the top plate is greater than the distance the guide wheel shaft extends into the support groove. With this optimized setting, when removing the guide wheel, the guide wheel can be lifted upwards first. Once the guide wheel shaft is completely removed from the support groove, the guide wheel shaft and guide wheel can be removed along the notch, improving the efficiency of switching between the upper and lower ends of the guide wheel.

[0015] As an optimization, the base plate is provided with several vertically penetrating discharge holes, which are located on the side of the first reinforcing plate near the guide straightening channel. This optimization scheme allows iron oxide scale to fall through the discharge holes on the base plate, preventing it from accumulating at the guide wheel. Furthermore, the first reinforcing plate acts as a barrier, preventing the iron oxide scale from collapsing onto the drive mechanism.

[0016] As an optimization, a vertically extending pin is threaded through the guide seat, and a support platform is fixed to the upper end of the pin, supporting the top surface of the guide seat. The guide seat is connected to the drive mechanism through the pin. This optimized solution connects the drive mechanism to the guide seat via a pin, resulting in a simple structure and convenient installation. The support platform prevents the pin from falling off.

[0017] As an optimization, the driving mechanism is an electric screw jack, with a connecting shaft fixedly connected to the extended end of the electric screw jack. The connecting shaft has a pin hole adapted to the pin shaft. This optimized solution uses an electric screw jack as the driving mechanism, which is convenient to use, facilitates adjustment of the guide wheel position, and utilizes the reverse self-locking function of the electric screw jack to prevent damage to the matching motor from impacts.

[0018] As an optimization, the guide seat also includes a second reinforcing plate located between the top plate and the bottom plate, and welded to both plates. The second reinforcing plate is positioned opposite to the first reinforcing plate, and the pin is located between the first and second reinforcing plates. The distance between the first and second reinforcing plates is adapted to the diameter of the pin. Through holes adapted to the connecting shaft are respectively formed on the first and second reinforcing plates. This optimized solution, by setting the second reinforcing plate, not only further improves the structural strength of the guide seat, but also forms a limit on the pin with the first reinforcing plate, preventing the pin from swinging left and right, thus improving the stability of the guide wheel position adjustment. The through holes prevent interference between the reinforcing plate and the connecting shaft.

[0019] As an optimization, the base housing is equipped with several partitions arranged at intervals along the front-to-back direction. Adjacent partitions form a discharge cavity corresponding to the guide and straightening assembly. An inclined guide plate is fixed within the discharge cavity, located below the guide and straightening channel. This optimized solution, by setting partitions to form a discharge cavity below the guide and straightening assembly, allows the detached iron oxide scale to fall onto the inclined guide plate in the discharge cavity, facilitating the collection of the iron oxide scale.

[0020] As an optimization, the guide straightening group consists of three groups: the left guide straightening unit in the front guide straightening group, the right guide straightening unit in the middle guide straightening group, and the left guide straightening unit in the rear guide straightening group form the first guide straightening working mechanism; the right guide straightening unit in the front guide straightening group, the left guide straightening unit in the middle guide straightening group, and the right guide straightening unit in the rear guide straightening group form the second guide straightening working mechanism. The first and second guide straightening working mechanisms operate simultaneously or at staggered times. This optimized scheme enables the first and second guide straightening working mechanisms to operate simultaneously or at staggered times. When the guide wheel in the first guide straightening working mechanism experiences severe wear, the guide seat containing the severely worn guide wheel can be removed from the working area via the drive mechanism. The second guide straightening working mechanism continues the guide straightening operation, switching the upper and lower ends of the worn guide wheel before pushing it back into the working area, ensuring the continuity of production.

[0021] As an optimization, threaded holes are provided on both ends of the guide wheel shaft along the axial direction, and a lifting eye bolt is threadedly connected to the threaded hole on the upper end face of the guide wheel shaft. This optimization scheme, by providing threaded holes on the end face of the guide wheel shaft, facilitates the connection of the lifting eye bolt, thereby making it easier to lift and remove the guide wheel shaft, and improving the efficiency of turning the guide wheel around.

[0022] The beneficial effects of this invention are as follows: the guide wheel shaft is installed through the notch and the support groove, which facilitates the disassembly and assembly of the guide wheel shaft, improves the efficiency of turning the guide wheel up and down, and utilizes the bottom of the notch and the side wall of the support groove to form lateral support for the guide wheel shaft at two points, thus avoiding the tilting of the guide wheel shaft; the guide wheel can be moved left and right through the drive mechanism, which not only facilitates the adjustment of the guide wheel position according to the size of the steel section, but also realizes the straightening of the steel section and avoids the steel section bending to the side. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the base box structure;

[0025] Figure 3 This is a schematic diagram of a double-sided guide plate structure;

[0026] Figure 4 This is a schematic diagram of a single-sided guide plate structure;

[0027] Figure 5 Schematic diagram of guide wheel installation structure;

[0028] Figure 6 Schematic diagram of the internal structure of the guide wheel installation;

[0029] Figure 7 This is a schematic diagram of the guide seat structure;

[0030] Figure 8 This is a schematic diagram of an electric screw jack.

[0031] As shown in the figure:

[0032] 1. Base box, 2. Guide plate, 3. Guide seat, 4. Guide wheel, 5. Electric screw jack, 6. Pin, 7. Guide wheel shaft, 8. Support groove, 9. Slot, 10. Top plate, 11. Bottom plate, 12. Side plate, 13. First reinforcing plate, 14. Guide groove, 15. Material drop hole, 16. Connecting shaft, 17. Second reinforcing plate, 18. Through hole, 19. Partition plate, 20. Inclined guide plate, 21. Lifting eye bolt. Detailed Implementation

[0033] The purpose of this solution is to provide a straightening machine outlet guide straightening device that is easy to operate, has an auxiliary straightening function, and can quickly flip the guide wheel for reuse after the guide wheel wears out.

[0034] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0035] like Figure 1 The diagram illustrates an outlet guiding and straightening device for a straightening machine, comprising a base housing 1 and several guiding and straightening groups arranged along the front-to-back direction on the base housing 1. Each guiding and straightening group includes two guiding and straightening units arranged opposite each other in the left-to-right direction. A guiding and straightening channel is formed between the left and right guiding and straightening units, which guides the track steel output from the straightening machine and simultaneously straightens the track steel laterally to prevent lateral bending. In this embodiment, three guiding and straightening groups are configured, with two guiding and straightening units in each group symmetrically arranged in the left-to-right direction.

[0036] The guiding and straightening unit includes a guide seat 3 that slides with the base housing 1, and a drive mechanism that drives the guide seat 3 to move in the left-right direction. The guide seat has a guide wheel 4 rotatably mounted on a guide wheel shaft 7 on the side facing the guiding and straightening channel. The guide wheel and guide wheel shaft are connected by bearings. The axis of the guide wheel shaft 7 extends vertically, and at least two straight sections are provided on the upper and lower end surfaces of the guide wheel shaft 7. The bottom of the guide seat has a support groove 8 that matches the lower end of the guide wheel shaft, and the top of the guide seat has a notch 9 that matches the upper end of the guide wheel shaft, with the opening of the notch 9 facing the side where the guiding and straightening channel is located. The sidewalls of the notch and support groove have a gap of 0.3mm to 0.5mm with the corresponding guide wheel shaft, making it easier to disassemble and assemble the guide wheel shaft.

[0037] To facilitate manufacturing, the upper and lower ends of the guide wheel shaft in this embodiment are milled flat to form a structure with two opposing straight sections, preventing the guide wheel shaft from rotating. The guide straightening channel is formed between the two opposing guide wheels. The track plate passes through the guide straightening channel, and the guide wheels on both sides are used to achieve guidance and straightening for lateral bends.

[0038] The guide wheel shaft has threaded holes on both ends of its axial direction. A lifting eye bolt 21 is threaded into the threaded hole on the upper end of the guide wheel shaft to facilitate lifting the guide wheel shaft upward when flipping it.

[0039] The guide seat 3 has a frame structure, including a top plate 10, a bottom plate 11, and two side plates 12 located between the bottom plate and the top plate and arranged opposite each other. A first reinforcing plate 13 is provided between the two side plates 12. The top plate 10, side plates 12, first reinforcing plate 13, and bottom plate 11 are welded together. The outer side of the side plates is provided with guide grooves 14 extending in the left-right direction. A guide plate 2 adapted to the guide groove is fixed on the base box. In this embodiment, as shown... Figure 4 As shown, the guide plates located at the front and rear ends of the base housing are single-sided guide plates. Figure 3 As shown, the guide plate in the middle is a double-sided guide plate, which also provides guidance to the guide seats on its front and rear sides. In this embodiment, there are four single-sided guide plates and four double-sided guide plates. The single-sided guide plates are installed on the outer side, and the double-sided guide plates are installed on the inner side. Each guide plate is fixed to the base box by hexagon socket head cap screws.

[0040] The notch 9 is formed on the top plate 10, and the support groove 8 extends downward from the upper surface of the bottom plate 11. The bottom of the notch provides lateral support to the upper end of the guide wheel shaft, and the side wall of the support groove provides lateral support to the lower end of the guide wheel shaft, so as to avoid the guide wheel shaft from tilting when passing steel and to better achieve lateral straightening.

[0041] The distance A between the guide wheel 4 and the top plate 10 is greater than the distance B from the guide wheel shaft to the support groove, and A>B+10mm. This allows the guide wheel to be quickly flipped over so that the unworn upper wheel surface can participate in production after the lower wheel surface of the guide wheel is worn.

[0042] The base plate 11 has several vertically extending discharge holes 15, which are located on the side of the first reinforcing plate near the guide straightening channel. These discharge holes provide a channel for the iron oxide scale to fall, preventing its accumulation and thus hindering the rotation of the guide rollers.

[0043] A pin 6 extending vertically is threaded through the guide seat. A support platform supporting the top surface of the guide seat is fixed at the upper end of the pin 6. The guide seat is connected to the drive mechanism through the pin 6.

[0044] The guide seat also includes a second reinforcing plate 17 located between the top plate and the bottom plate and welded to the top plate and the bottom plate. The second reinforcing plate 17 is disposed opposite to the first reinforcing plate 13, and the second reinforcing plate is located on the side of the first reinforcing plate away from the guide straightening channel. The pin 6 is located between the first reinforcing plate 13 and the second reinforcing plate 17. The distance between the first reinforcing plate and the second reinforcing plate is adapted to the diameter of the pin. The first reinforcing plate and the second reinforcing plate are respectively provided with through holes 18 adapted to the connecting shaft.

[0045] The driving mechanism in this embodiment is an existing electric screw jack 5, which has a self-locking function, simple structure, and high degree of automation. A fixed baffle for mounting the electric screw jack is fixedly attached to the base housing. A connecting shaft 16 is fixedly attached to the extended end of the electric screw jack 5, and the connecting shaft 16 has a pin hole adapted to the pin shaft 6. To prevent damage to the motor of the electric screw jack from impact, a steering mechanism is provided to change the motor from a vertical to a horizontal position. The steering mechanism is a bevel gear transmission mechanism that changes the power output direction of the motor by 90 degrees. This embodiment uses a total of 6 electric screw jacks, with the extension stroke selected according to actual needs, and each jack is mounted on a fixed baffle on both sides of the base housing.

[0046] The base housing is equipped with several partitions 19 arranged at intervals along the front-to-back direction. Adjacent partitions form a discharge cavity corresponding to the guide straightening assembly. An inclined guide plate 20, located below the guide straightening channel, is fixed within the discharge cavity to guide the iron oxide scale downwards. The base housing serves as a foundation supporting other components and simultaneously forms a space to receive the iron oxide scale, preventing it from accumulating at the guide rollers and hindering their rotation. The inclined guide plate facilitates the sliding of the iron oxide scale, prevents accumulation, and makes cleaning easier.

[0047] In this embodiment, the guide and straightening group consists of three groups. The left guide and straightening unit in the front guide and straightening group, the right guide and straightening unit in the middle guide and straightening group, and the left guide and straightening unit in the rear guide and straightening group form the first guide and straightening working mechanism, which cooperate to perform guidance and straightening. The right guide and straightening unit in the front guide and straightening group, the left guide and straightening unit in the middle guide and straightening group, and the right guide and straightening unit in the rear guide and straightening group form the second guide and straightening working mechanism, which cooperate to perform guidance and straightening. The first guide and straightening working mechanism and the second guide and straightening working mechanism operate simultaneously or at different times.

[0048] During installation, the guide seat is assembled with the guide plate through the guide grooves on both sides, and then the electric screw jack is connected to the guide seat using pin 6. Finally, the assembled guide wheel is installed into the guide seat and fixed using the notch and support groove of the guide seat. The notch is a U-shaped groove and the support groove is a flat groove. The position of the guide wheel is adjusted by sliding the guide seat to accommodate different specifications of steel.

[0049] This embodiment is used for the lateral bending straightening of steel profiles after planar straightening by a straightening machine. It is not only used for guiding and straightening track steel, but also for guiding and straightening other types of steel. In use, the guiding and straightening units of the three sets of guiding and straightening groups are staggered and used alternately in two groups. The number of guiding and straightening groups can also be increased according to actual needs.

[0050] The working principle of this embodiment is as follows: After the device is installed and put into operation, the six guide wheels are adjusted individually by electric screw jacks. In actual production, they can be divided into two groups of three guide wheels each, which are used in a staggered manner. When the wheel surface of a group of guide wheels is worn, the screw jacks can be electrically controlled to move backward to remove the group of guide wheels from production, while the other group of guide wheels is electrically controlled to move forward and put into production. When a short-term shutdown for maintenance is required, the guide wheels can be quickly flipped so that the unworn surface can be put into production, that is, one guide wheel can be used twice.

[0051] The guiding and straightening device in this embodiment serves both guiding and auxiliary straightening functions. By dividing the guide wheels into two groups for alternating use through misalignment, it reduces lateral bending of the rolled pieces and improves the yield of section steel (especially track steel) products. Furthermore, the guide wheels are used alternately, and each guide wheel is designed with a symmetrical upper and lower structure, allowing for two uses and reducing the frequency of guide wheel replacement. When replacing or flipping the guide wheels, the other group of guiding and straightening mechanisms continues to participate in production normally, which not only does not affect the production rhythm but also reduces production costs and labor intensity. The device not only has a simple structure but also improves the degree of automation and reduces labor intensity. By setting up an iron oxide scale receiving and guiding device, it reduces the accumulation of iron oxide scale on the platform, which is beneficial for cleaning.

[0052] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A guide and straightening device for the outlet of a straightening machine, characterized in that: It includes a base box (1) and several guide straightening groups arranged in the front-back direction on the base box (1). Each guide straightening group includes two guide straightening units arranged opposite each other in the left-right direction. A guide straightening channel is formed between the guide straightening unit on the left and the guide straightening unit on the right. The guide straightening unit includes a guide seat (3) that slides with the base box (1) and a drive mechanism that drives the guide seat (3) to move in the left and right direction. The guide seat has a guide wheel (4) rotatably mounted on the guide wheel shaft (7) on the side facing the guide straightening channel. The axis of the guide wheel shaft (7) extends vertically. At least two straight sections are provided on the upper and lower axial surfaces of the guide wheel shaft (7). The bottom of the guide seat has a support groove (8) that matches the lower end of the guide wheel shaft. The top of the guide seat has a notch (9) that matches the upper end of the guide wheel shaft. The opening of the notch (9) faces the side where the guide straightening channel is located. The distance A between the guide wheel and the top plate is greater than the distance B from the guide wheel shaft to the support groove, so that when the lower wheel surface of the guide wheel is worn, the guide wheel can be quickly flipped so that the upper unworn wheel surface can participate in production.

2. The outlet guide straightening device of a straightening machine according to claim 1, characterized in that: The guide seat (3) includes a top plate (10), a bottom plate (11), and two side plates (12) located between the bottom plate and the top plate and arranged opposite to each other. A first reinforcing plate (13) is provided between the two side plates (12). The top plate (10), side plates (12), first reinforcing plate (13) and bottom plate (11) are welded together. The outer side of the side plate is provided with a guide groove (14) extending in the left and right direction. A guide plate adapted to the guide groove is fixed on the base box. The slot (9) is formed on the top plate (10), and the support groove (8) extends downward from the upper surface of the bottom plate (11).

3. The outlet guide straightening device of a straightening machine according to claim 2, characterized in that: The base plate (11) has several vertically penetrating drop holes (15), and the drop holes (15) are located on the side of the first reinforcing plate near the guide straightening channel.

4. The outlet guide straightening device of a straightening machine according to claim 2, characterized in that: A pin (6) extending vertically is provided on the guide seat. A support platform supporting the top surface of the guide seat is fixed at the upper end of the pin (6). The guide seat is connected to the drive mechanism through the pin (6).

5. The outlet guide straightening device of a straightening machine according to claim 4, characterized in that: The driving mechanism is an electric screw jack (5), and the extended end of the electric screw jack (5) is fixedly connected to a connecting shaft (16). The connecting shaft (16) has a pin hole that matches the pin shaft (6).

6. The outlet guide straightening device of a straightening machine according to claim 5, characterized in that: The guide seat also includes a second reinforcing plate (17) located between the top plate and the bottom plate and welded to the top plate and the bottom plate. The second reinforcing plate (17) is arranged opposite to the first reinforcing plate (13). The pin (6) is located between the first reinforcing plate (13) and the second reinforcing plate (17). The distance between the first reinforcing plate and the second reinforcing plate is adapted to the diameter of the pin. The first reinforcing plate and the second reinforcing plate are respectively provided with through holes (18) adapted to the connecting shaft.

7. The outlet guide straightening device of a straightening machine according to claim 1, characterized in that: The base housing is fixed with several partitions (19) arranged at intervals along the front and rear direction. The adjacent partitions form a discharge cavity corresponding to the guide straightening group. An inclined guide plate (20) located below the guide straightening channel is fixed in the discharge cavity.

8. The outlet guide straightening device of a straightening machine according to claim 1, characterized in that: The guide straightening group consists of three groups: the left guide straightening unit in the front guide straightening group, the right guide straightening unit in the middle guide straightening group, and the left guide straightening unit in the rear guide straightening group form the first guide straightening operation mechanism; the right guide straightening unit in the front guide straightening group, the left guide straightening unit in the middle guide straightening group, and the right guide straightening unit in the rear guide straightening group form the second guide straightening operation mechanism; the first guide straightening operation mechanism and the second guide straightening operation mechanism operate simultaneously or at staggered times.

9. The outlet guide straightening device of a straightening machine according to claim 1, characterized in that: The guide wheel shaft has threaded holes on both ends of its axial direction, and a lifting eye bolt (21) is threadedly connected to the threaded hole on the upper end of the guide wheel shaft.

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