Rolling angle pipe threader

Abstract

This utility model relates to a rolling angled pipe threader, belonging to the technical field of auxiliary equipment for pipe laying in utility tunnels. It solves the problems of fixed angles, easy wear on pipelines, and low efficiency in existing pipe threading support devices. The key features of this pipe threader solution include: two sets of supports are installed on the base of the pipe threader, each set containing a short support and a high support, with multiple rest positions on the high support; one end of each of the two fixed shafts is hinged to the short support, and the other end is adjustablely resting on a rest position on the high support to form a V-shaped support; two rollers are rotatably connected to the fixed shafts. It is mainly used for guiding the laying of cables or pipes in utility tunnels, reducing traction resistance and protecting the pipeline surface.

Description

Technical Field

[0001] This utility model relates to the field of pipeline installation technology. More specifically, this utility model relates to a rolling angle pipe inserter. Background Technology

[0002] When threading linear materials such as cables and pipes in pipe racks or similar confined spaces, support devices are often required to change the laying direction or reduce traction resistance. Existing support devices mostly use guide wheels or sliding plate structures with fixed angles. The angles of these structures are usually not flexibly adjustable according to the actual threading path on site. This leads to excessively large or small wrap angles between the pipeline and the device contact point when encountering complex routes, easily causing a sharp increase in traction force or pipeline derailment, thus reducing construction efficiency.

[0003] Some devices attempt to incorporate angle adjustment functionality, but their adjustment mechanisms are often quite complex, requiring tools for disassembly and reinstallation, making the process cumbersome and time-consuming. After adjustment, their stability and load-bearing capacity are sometimes difficult to guarantee, posing safety hazards. Furthermore, the base length of these devices is mostly fixed, making them unsuitable for support beams with varying spacing within the utility tunnel, significantly limiting their application range.

[0004] Another common problem is that the rollers or guide wheels of the device often experience sliding friction or simple rolling friction with the pipeline, resulting in insufficient rotational flexibility. This frictional resistance remains high, especially when laying heavy cables. The roller surface is typically made of metal, and direct friction with the cable sheath poses a risk of scratching or abrading the pipeline's outer surface.

[0005] In terms of fixing methods, existing devices mostly use welding or drilling bolt connections, which not only compromises the structural integrity of the support beam but also makes installation and disassembly time-consuming and labor-intensive, hindering rapid site relocation. Therefore, there is an urgent need for a pipe-penetrating support device that offers flexible angle adjustment, stable support, strong adaptability, and effective protection for pipelines. Utility Model Content

[0006] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0007] To achieve these objectives and other advantages according to the present invention, a rolling angled pipe threader is provided, comprising: Pipe inserter base; Two sets of supports are set on the tube inserter base. Each set of supports includes a short support and a tall support. The two sets of supports are distributed on the same straight line on the top surface of the tube inserter base. The two short supports are located between the two tall supports. The tall support has multiple rest positions along the height direction. Two fixed shafts are respectively set on two sets of brackets to form a V-shaped support structure. One end of the fixed shaft is hinged to the short bracket, and the other end can be selectively placed on one of the resting positions on the high bracket. Two rollers are coaxially mounted on two fixed shafts, and the rollers are rotatably connected to the fixed shafts.

[0008] Preferably, the low support includes: A pair of ear plates are disposed on the top surface of the tube inserter base, and the axis of the ear hole on the pair of ear plates is perpendicular to the straight line of the distribution of the two sets of supports; One end of the fixed shaft has a first through hole in the radial direction, and the fixed shaft is positioned between a pair of ear plates. A pin passes through the ear holes on a pair of ear plates and the first through hole on the fixed shaft, so that the fixed shaft can rotate around the axis of the pin.

[0009] Preferably, the high support includes: a first channel steel, which is disposed on the top surface of the pipe inserter base, and the slot faces the low support in the same group; The resting position includes: a horizontal slot provided on the inner wall of the first channel steel and a detachable stop plate inserted into the slot, wherein the stop plate has a notch on the side facing the slot of the first channel steel for limiting the other end of the fixed shaft.

[0010] Preferably, the tube inserter base includes: The first square tube and the second channel steel, the second channel steel with the groove opening facing downwards and welded to the middle of one side wall of the first square tube to form a T shape, the high support is set on the first square tube, the low support is set on the second channel steel, and the second channel steel has through holes on both sides of its side walls; The second square tube has a width and height that are adapted to the second channel steel so that the end of the second square tube can be inserted into the second channel steel at a controllable depth. Several through third holes are provided on both sides of the second square tube. The second channel steel can be selectively aligned with one of the third through holes so that the second channel steel and the second square tube can be connected by bolts passing through the second through hole and the third through hole.

[0011] Preferably, bearings are coaxially arranged inside both ends of the roller, and the fixed shaft passes through the center hole of the bearing and is fixedly connected to the inner ring of the bearing, so that the roller is rotatably connected to the fixed shaft.

[0012] Preferably, one end of the first square tube is welded with a first U-shaped groove for inserting one side flange of the top beam in the pipe gallery, and the other end of the first square tube is detachably provided with a second U-shaped groove for inserting the other side flange of the top beam in the pipe gallery. The top of the second U-shaped groove is provided with a threaded hole, and the top and bottom of the first square tube are provided with a fourth through hole corresponding to the threaded hole. A screw threaded through the fourth through hole is threaded into the threaded hole, and a locking nut is threaded to the top of the screw, so that the second U-shaped groove fixes the first square tube to the beam.

[0013] Preferably, a rubber sleeve is fitted onto the surface of the roller.

[0014] This utility model has at least the following beneficial effects: When in use, the pipe threading device is first fixed to the crossbeam of the pipe gallery or other supporting structure via a base. The angle of the fixed shaft is adjusted to adapt to the actual pipe threading size. During the threading process, the rolling of the rollers assists in conveying the pipe, greatly reducing traction resistance, improving construction efficiency, and also reducing wear on the outer sheath of the pipeline. The entire device has a stable structure, high adjustability, and convenient operation, exhibiting good engineering applicability and economic benefits.

[0015] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0016] Fig. 1 This is a front structural diagram of the rolling angle tube inserter described in this utility model; Fig. 2 This is a three-dimensional structural diagram of the gear shift plate described in this utility model; Fig. 3 This is a side view of the rolling angle pipe inserter of this utility model. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0018] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] like Figs. 1-3 As shown, this utility model provides a rolling angled pipe threader, comprising: Pipe inserter base; Two sets of supports are set on the tube inserter base. Each set of supports includes a short support and a tall support. The two sets of supports are distributed on the same straight line on the top surface of the tube inserter base. The two short supports are located between the two tall supports. The tall support has multiple rest positions along the height direction. Two fixed shafts 1 are respectively set on two sets of brackets to form a V-shaped support structure. One end of the fixed shaft 1 is hinged to the short bracket, and the other end can be selectively placed on one of the resting positions on the high bracket. Two rollers 2 are coaxially mounted on two fixed shafts 1, and the rollers 2 are rotatably connected to the fixed shafts 1.

[0020] In the above technical solution, the rolling angled pipe threader mainly includes a pipe threader base, two sets of supports, two fixed shafts 1, and two rollers 2. The pipe threader base serves as the supporting foundation for the entire device. Two sets of supports are arranged along the same straight line on its top. Each set of supports consists of a short support and a tall support, with the two short supports located between the two tall supports. The tall supports have multiple rest positions in the height direction for flexibly adjusting the tilt angle of the fixed shafts 1.

[0021] One end of the fixed shaft 1 is connected to the low support via a hinge, while the other end can be placed on a specific resting position on the high support as needed, thus forming an adjustable V-shaped support structure. This design allows the pipe threader to adapt to different pipe diameter requirements under various working conditions. The roller 2 is mounted on the fixed shaft 1 via a rotatable connection and can rotate freely on the axis to reduce friction between the cable or pipe and the support surface during pipe threading.

[0022] For example, in actual operation, the operator can select different positions on the high bracket to place the end of the fixed shaft 1 according to the diameter of the pipe being threaded, thereby changing the angle of the V-shaped opening and making the threading process smoother. The outer surface of the roller 2 is usually covered with flexible materials such as rubber to further protect the surface of the pipe or cable from damage.

[0023] When using this pipe threading tool, the equipment is first fixed to the pipe rack beam 13 or other supporting structure via the base. The angle of the fixed shaft 1 is adjusted to adapt to the actual pipe threading size. During the pipe threading process, the rolling of the roller 2 assists in conveying the pipe, which greatly reduces traction resistance, improves construction efficiency, and also reduces wear on the outer sheath of the pipeline. The entire device has a stable structure, high adjustability, and is easy to operate, with good engineering applicability and economic benefits.

[0024] Furthermore, the low support includes: A pair of ear plates 3 are disposed on the top surface of the tube inserter base, and the axis of the ear hole on the pair of ear plates 3 is perpendicular to the straight line of the distribution of the two sets of supports; One end of the fixed shaft 1 has a first through hole in the radial direction, and one end of the fixed shaft 1 is located between a pair of ear plates 3. A pin 4 passes through the ear holes on a pair of ear plates 3 and the first through hole on the fixed shaft 1, so that the fixed shaft 1 can rotate around the axis of the pin 4.

[0025] In the above technical solution, the short support mainly includes a pair of ear plates 3 welded or fixed to the top surface of the tube inserter base. The pair of ear plates 3 are arranged in parallel, and the axis of the ear hole on them is perpendicular to the distribution line of the two sets of supports. This layout provides a clear directional basis for the installation of the fixed shaft 1.

[0026] One end of the fixed shaft 1 has a first through hole machined radially. During installation, this end of the fixed shaft 1 is placed between a pair of ear plates 3, and the ear holes on the ear plates 3 are aligned with the first through hole on the fixed shaft 1. Then, a pin 4 is passed sequentially through the ear hole of one ear plate 3, the through hole of the fixed shaft 1, and the ear hole of the other ear plate 3, thereby hinged the fixed shaft 1 between the pair of ear plates 3.

[0027] This hinge design allows the fixed shaft 1 to rotate around the axis of the pin 4 at a certain angle, providing a basis for adjusting the other end at different positions on the high bracket. For example, when it is necessary to increase the included angle of the V-shaped support structure, the operator can lift the fixed shaft 1 to rotate it around the pin 4, thereby moving its end from the high position to the low position. The entire adjustment process is flexible and labor-saving, with the hinge point as the center.

[0028] This structure enables a rotatable connection of the fixed shaft 1. Its advantages lie in its simple and reliable structure, reasonable force distribution at the hinge point, and guarantee of stability and smoothness during the adjustment process. It is a key foundational element for realizing the adjustable angle function of the tube inserter.

[0029] Furthermore, the high support includes: a first channel steel 5, which is disposed on the top surface of the pipe inserter base, and the slot faces the low support in the same group; The resting position includes: a horizontal slot 6 set on the inner wall of the first channel steel 5 and a detachable stop plate 7 inserted into the slot 6. The stop plate 7 has a notch on the side facing the slot of the first channel steel 5 for limiting the other end of the fixed shaft 1.

[0030] In the above technical solution, the main body of the high support adopts a section of first channel steel 5, which is fixed on the top surface of the pipe inserter base, and its slot faces the short support that it is paired with. This orientation design provides space and convenience for the subsequent installation of the adjustable gear structure.

[0031] The support plate consists of two main parts. The first part consists of multiple layers of slots 6 horizontally formed on the two inner side walls of the first channel steel 5. These slots 6 are arranged in pairs to support the second part, the removable support plate 7. The support plate 7 can be directly inserted into a pair of aligned slots 6, and a specific notch is machined on the edge facing the opening of the channel steel.

[0032] When adjusting the angle, specific operating steps must be followed. First, all gear plates 7 in the current position and along the target adjustment path must be removed from the slots 6 to allow unobstructed swinging space for the end of the fixed shaft 1 to rotate. Then, lift the end of the fixed shaft 1 by hand and rotate it around the hinge point at the other end until its height slightly exceeds the height of the target gear. Next, insert the gear plate 7 into the slot 6 of the target gear, and finally, securely place the end of the fixed shaft 1 into the notch of the gear plate 7 to complete the angle adjustment.

[0033] The shape of this notch matches the diameter of the fixed shaft 1, and its function is to precisely limit and support the end of the fixed shaft 1. This step-by-step operation method ensures the safety and smoothness of the adjustment process, and avoids the fixed shaft 1 from colliding with or getting stuck on the stop plate 7 when rotating.

[0034] The modular slot 6 and detachable stop plate 7 design not only allow for flexible height adjustment, but also enable the spacing and number of stop plates 7 to be increased or decreased according to actual needs, expanding the applicability of the equipment. Its technical advantages include rapid, tiered angle adjustment, a simple structure, intuitive operation, and ensure the stability of the fixed shaft 1 under load, preventing accidental displacement during operation.

[0035] Furthermore, the tube-piercing base includes: The first square tube 8 and the second channel steel 9 have the groove opening facing downwards and are welded to the middle of one side wall of the first square tube 8 to form a T shape. The high support is set on the first square tube 8 and the low support is set on the second channel steel 9. The two side walls of the second channel steel 9 are provided with through holes. The second square tube 10 has a width and height that are adapted to the second channel steel 9 so that the end of the second square tube 10 can be inserted into the second channel steel 9 at a controllable depth. The two side walls of the second square tube 10 are provided with several through third holes. The second channel steel 9 can be selectively aligned with one of the third holes so that the second channel steel 9 and the second square tube 10 can be connected by bolts passing through the second and third holes.

[0036] In the above technical solution, the core part of the base is welded together from a first square tube 8 and a second channel steel 9. The groove of the second channel steel 9 faces downward and is welded to the middle of one side wall of the first square tube 8, together forming a stable T-shaped main structure. The high support is fixedly installed on the first square tube 8 of this T-shaped structure, while the low support is set on the top surface of the second channel steel 9. This layout reasonably distributes the support points.

[0037] To allow for flexible adjustment of the overall length of the base to adapt to support environments with varying spacing, a telescopic extension mechanism was designed. A pair of through holes are formed on both sides of the second channel steel 9. A second square tube 10 is fitted to these holes; its cross-sectional dimensions are carefully designed to ensure a tight and smooth insertion into the slot of the second channel steel 9.

[0038] At the same height on both sides of the second square tube 10, multiple sets of through-holes are spaced apart along its length. To adjust the length, first insert the second square tube 10 into the open end of the second channel steel 9 and slide it to the desired approximate length. Then, finely adjust the insertion depth of the second square tube 10 so that a second through-hole on the side wall of the second channel steel 9 is precisely aligned with a set of third through-holes in the second square tube 10. Finally, pass bolts through the aligned second and third through-holes in sequence and tighten the nuts to securely connect and fix the two sections of the structure, forming a complete base of the desired length.

[0039] For example, when the top flange of the crossbeam 13 in the pipe gallery is wide, the operator can pull the second square tube 10 out of the second channel steel 9 and connect it to a set of third through holes further out, thereby effectively extending the length of the entire base and enabling it to span a wider distance. This modular telescopic design greatly improves the adaptability of the equipment, freeing it from the constraints of fixed dimensions and allowing it to flexibly cope with various on-site installation conditions. Its technical advantage lies in providing a simple, rigid, and easily adjustable length extension solution, ensuring stable and reliable support for the base in different working scenarios.

[0040] Furthermore, bearings 11 are coaxially arranged inside both ends of the roller 2, and the fixed shaft 1 passes through the central hole of the bearing 11 and is fixedly connected to the inner ring of the bearing 11, so that the roller 2 is rotatably connected to the fixed shaft 1.

[0041] The above technical solution specifies the rotational connection method between the roller 2 and the fixed shaft 1. This design aims to ensure that the roller 2 can rotate flexibly and with low resistance. To achieve this, a bearing 11 is coaxially installed inside both ends of each roller 2. The axes of these two bearings 11 are completely coincident with the axis of the roller 2, which is the basis for ensuring the smooth rotation of the roller 2.

[0042] The fixed shaft 1, serving as the core support component, passes sequentially through the center holes of the bearings 11 at both ends of the roller 2. The fixed shaft 1 and the inner ring of the bearings 11 are fixedly connected via an interference fit or through keyways, set screws, etc., ensuring no relative movement between them. The outer ring of the bearings 11 is fixedly connected to the inner wall of the roller 2. This connection method makes the power transmission path very clear: when an external cable or pipe drags the surface of the roller 2, friction drives the roller 2 to rotate. This rotational motion is transmitted through the outer ring and balls of the bearings 11, and ultimately the load is shared by the inner ring and the fixed shaft 1. Since the inner ring and the shaft are fixed, the fixed shaft 1 itself does not rotate, serving only as a support beam.

[0043] For example, when threading heavy cables, the cable presses against the surface of the roller 2, which is fitted with a rubber sleeve, and the huge pulling force is converted into the rotational torque of the roller 2. Thanks to the internal precision bearing 11 structure, the roller 2 can rotate smoothly with extremely low frictional resistance, thereby converting sliding friction into rolling friction, significantly reducing the force required for traction, and effectively protecting the cable sheath from scratches.

[0044] The core advantage of this design lies in its significant reduction of frictional losses. Its technical benefits are reflected in three aspects: First, rolling friction replaces sliding friction, making pipe-laying operations more labor-saving and efficient; second, the use of bearing 11 ensures rotational accuracy and load-bearing capacity, enabling the equipment to adapt to the laying of heavy pipelines; finally, the enclosed bearing 11 structure provides excellent dustproofing and durability, reducing maintenance requirements and extending the service life of the entire device in harsh working environments.

[0045] Furthermore, a first U-shaped groove 12 is welded to one end of the first square tube 8 for inserting one side flange of the top of the crossbeam 13 in the pipe gallery. A second U-shaped groove 14 is detachably provided at the other end of the first square tube 8 for inserting the other side flange of the top of the crossbeam 13 in the pipe gallery. A threaded hole is provided at the top of the second U-shaped groove 14. A fourth through hole corresponding to the threaded hole is provided at the top and bottom of the first square tube 8. A screw 15 is threaded through the fourth through hole in the threaded hole. A locking nut 16 is also threaded at the top of the screw 15 so that the second U-shaped groove 14 fixes the first square tube 8 to the crossbeam 13.

[0046] The above technical solution details the specific mounting structure for fixing the pipe inserter base to the crossbeam 13 of the pipe gallery. This structure mainly consists of two U-shaped slots, located at both ends of the first square tube 8. One of the first U-shaped slots 12 is permanently fixed to one end of the first square tube 8 by welding, with its U-shaped opening horizontally facing the other end of the first square tube 8, used to engage the flange on one side of the top of the crossbeam 13 from the side.

[0047] At the other end of the first square tube 8, a detachable second U-shaped slot 14 is provided. The structure of the second U-shaped slot 14 is similar to the first, but it has a threaded hole machined at its top. To accommodate this, a pair of through-holes are provided at corresponding positions at the top and bottom of the first square tube 8 at this end. During installation, the opening of the second U-shaped slot 14 is first positioned horizontally towards one end of the first square tube 8 and inserted into the flange on the other side of the crossbeam 13. Then, a screw 15 is screwed into the threaded hole from above the first square tube 8, passing through the top and bottom fourth through-holes, and abutting against the flange on the other side of the top of the crossbeam 13. Finally, a locking nut 16 is screwed into the top of the screw 15.

[0048] By tightening the locking nut 16, the screw 15 is subjected to an upward pulling force, which causes the second U-shaped groove 14 below it to tightly adhere to the bottom surface of the other side flange of the top of the crossbeam 13. This action securely clamps the flange of the crossbeam 13 within the space formed by the first U-shaped groove 12, the bottom of the first square tube 8, and the second U-shaped groove 14, achieving a rigid connection between the entire base and the crossbeam 13.

[0049] For example, during actual installation, the operator can first hook the end with the first U-shaped slot 12 welded on to one side of the crossbeam 13, then move the base so that the second U-shaped slot 14 at the other end aligns with the other flange of the crossbeam 13 and engages. Finally, the fixing can be quickly completed by tightening the screw 15 and nut. This design eliminates the tedious process of drilling holes in the crossbeam 13, achieving non-destructive installation.

[0050] Furthermore, a rubber sleeve is fitted onto the surface of the roller 2.

[0051] The above technical solution optimizes the contact surface of the roller 2 by proposing to add a cylindrical rubber sleeve to the outer surface of the metal roller 2. This rubber sleeve is typically made of wear-resistant, oil-resistant rubber material with a high coefficient of friction, and its inner diameter matches the outer diameter of the metal roller 2 to ensure a tight fit on the surface of the roller 2.

[0052] During installation, the prefabricated rubber cylinder is typically stretched and rolled onto the outside of the metal roller 2 using its own elastic deformation. For cases requiring a high degree of interference fit or with large dimensions, lubricant or specialized installation tools can be used to assist in the installation, ensuring that the rubber cylinder is properly installed and evenly wrapped around the circumference, preventing it from shifting or twisting during rotation.

[0053] In practical use, when a cable or pipe is pressed against roller 2, it is in direct contact with the rubber layer on its surface. For example, when pulling a smooth-sheathed optical fiber cable, the flexibility and high friction properties provided by the rubber roller surface can firmly "grip" the cable to prevent slippage, while its soft texture will not scratch the cable's fragile plastic outer sheath. Compared to direct friction with a metal surface, the rubber surface can provide greater static friction and a gentler contact.

[0054] This design brings several significant technical benefits. Firstly, it effectively protects the surface of the pipes or cables passing through, preventing scratches, indentations, or wear that could be caused by the metal roller 2, which is especially crucial for pipes with anti-corrosion coatings or marking lines. Secondly, the increased friction provided by the rubber material ensures effective transmission of traction force, preventing the pipes from slipping on the roller 2 and thus improving pipe threading efficiency. Furthermore, the rubber material also provides some shock absorption and noise reduction, improving the working environment. Finally, as a consumable part, this rubber sheath can be easily replaced after wear, thereby extending the service life of the core metal roller 2 and reducing overall maintenance costs.

[0055] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A rolling angle cannulato, characterized by, include: Pipe inserter base; Two sets of supports are set on the tube inserter base. Each set of supports includes a short support and a tall support. The two sets of supports are distributed on the same straight line on the top surface of the tube inserter base. The two short supports are located between the two tall supports. The tall support has multiple rest positions along the height direction. Two fixed shafts are respectively set on two sets of brackets to form a V-shaped support structure. One end of the fixed shaft is hinged to the short bracket, and the other end can be selectively placed on one of the resting positions on the high bracket. Two rollers are coaxially mounted on two fixed shafts, and the rollers are rotatably connected to the fixed shafts.

2. The rolling angle introducer of claim 1, wherein, The short support includes: A pair of ear plates are disposed on the top surface of the tube inserter base, and the axis of the ear hole on the pair of ear plates is perpendicular to the straight line of the distribution of the two sets of supports; One end of the fixed shaft has a first through hole in the radial direction, and the fixed shaft is positioned between a pair of ear plates. A pin passes through the ear holes on a pair of ear plates and the first through hole on the fixed shaft, so that the fixed shaft can rotate around the axis of the pin.

3. The rolling angle introducer of claim 1, wherein, The tall support includes: a first channel steel, which is disposed on the top surface of the pipe inserter base, and the slot faces the short support in the same group; The resting position includes: a horizontal slot provided on the inner wall of the first channel steel and a detachable stop plate inserted into the slot, wherein the stop plate has a notch on the side facing the slot of the first channel steel for limiting the other end of the fixed shaft.

4. The rolling angle introducer of claim 1, wherein, The tube inserter base includes: The first square tube and the second channel steel, the second channel steel with the groove opening facing downwards and welded to the middle of one side wall of the first square tube to form a T shape, the high support is set on the first square tube, the low support is set on the second channel steel, and the second channel steel has through holes on both sides of its side walls; The second square tube has a width and height that are adapted to the second channel steel so that the end of the second square tube can be inserted into the second channel steel at a controllable depth. Several through third holes are provided on both sides of the second square tube. The second channel steel can be selectively aligned with one of the third through holes so that the second channel steel and the second square tube can be connected by bolts passing through the second through hole and the third through hole.

5. The rolling angle introducer of claim 1 wherein, Bearings are coaxially installed inside both ends of the roller. The fixed shaft passes through the center hole of the bearing and is fixedly connected to the inner ring of the bearing, so that the roller is rotatably connected to the fixed shaft.

6. The rolling angle introducer of claim 4, wherein, One end of the first square tube is welded with a first U-shaped groove for inserting one side flange of the top beam in the pipe gallery. The other end of the first square tube is detachably provided with a second U-shaped groove for inserting the other side flange of the top beam in the pipe gallery. The top of the second U-shaped groove is provided with a threaded hole. The top and bottom of the first square tube are provided with a fourth through hole corresponding to the threaded hole. A screw threaded through the fourth through hole is threaded into the threaded hole. A locking nut is also threaded onto the top of the screw so that the second U-shaped groove can fix the first square tube to the beam.

7. The rolling angle introducer of claim 1 wherein, A rubber sleeve is fitted onto the surface of the roller.

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