A thick bundle of tape reel unwinder

Abstract

The application discloses a thick bale belt reel, and particularly relates to the field of metal bale belt packaging, and comprises an unwinding base, a lifting support, a rotary tray, a lifting hydraulic cylinder, a speed reducer and a bale belt disc assembly; the outer periphery of the lifting support is provided with an outer guide rail, the inner periphery of the unwinding base is provided with an inner guide rail, and the lifting support and the unwinding base are connected in a sliding mode along the vertical direction through cooperation of the outer guide rail and the inner guide rail. The unwinding machine is designed as a rotary lifting structure composed of the lifting support and the rotary tray, an outer cone and a driving protrusion are arranged on the rotary tray, the inner cone and the positioning groove of the bale belt disc assembly are matched, the quick installation and positioning of the bale belt disc assembly composed of multiple bale belt discs are realized, the bale belt storage capacity of one-time filling is improved, the baling production line can be continuously operated for a long time, the shutdown caused by frequent replacement of single bale belt disc is avoided, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of metal strapping packaging technology, and more specifically, to a thick strapping reel uncoiling machine. Background Technology

[0002] In the production process of hot-rolled narrow strip steel, the packaging of finished steel coils is a crucial step to ensure that the products do not scatter or become damaged during transportation, loading, unloading, and storage. Currently, the commonly used bundling methods in the industry include circumferential bundling and axial (through-core) bundling. Among them, axial bundling has become the mainstream process for packaging large steel coils because it can efficiently fix multiple steel coils along the axial direction. The strapping used for bundling is mostly plain carbon steel strip with a thickness of 2-4mm and a width of 40-50mm. This type of steel strip is made by longitudinally shearing hot-rolled strip steel and has the advantages of good toughness, high strength, and low cost.

[0003] However, in actual automated bundling production lines, the upstream strapping feeding device, i.e., the uncoiler, directly affects the production efficiency and stability of the entire line. Currently, domestic technology for automatic axial bundling of multiple coils of hot-rolled narrow strip steel has seen some development. For example, the automatic bundling machine for multiple coils of hot-rolled narrow strip steel disclosed in invention patent number ZL201210052200.2 automates the bundling process. However, in its feeding stage, and in existing technologies such as the steel coil strapping feeding device disclosed in announcement number CN218809659U, a single-disc circular strapping feeding method is commonly used. Although these technologies have replaced manual labor to some extent, they still reveal the following significant shortcomings and defects when facing the demands of continuous and efficient production in modern steel enterprises:

[0004] 1. Insufficient single-reel strapping stock and frequent replacements lead to production interruptions: The length of a single reel of strapping is limited, and it is consumed very quickly in continuous bundling operations. Once a single reel of strapping is used up, the entire bundling production line must be shut down to replace it with a new reel. The replacement process is not only time-consuming, but also often requires complex clamping and alignment installation steps, resulting in high labor intensity for operators. Frequent downtime directly leads to a decrease in the effective operating rate of the equipment, severely restricting the increase in production line capacity and failing to meet the ever-growing demand for continuous and uninterrupted production.

[0005] 2. The problem of loose and detached strapping is severe, causing jamming malfunctions: During the automatic strapping take-up or reverse tensioning process, excess strapping may slip out of the threading mechanism. In existing single-reel feeding devices, due to the lack of an effective tension control mechanism, the slipped excess strapping will fall and loosen due to its own gravity, eventually deviating from the strapping reel or even falling off completely. Once this happens, the strapping is very likely to get stuck in the guide groove during subsequent threading, causing equipment malfunctions and downtime. This not only damages the strapping but also severely disrupts production continuity and increases maintenance costs.

[0006] 3. The manufacturing process of single-reel strapping is complex and inefficient: The manufacturing process of thick strapping involves first slitting hot-rolled narrow strip steel into strips. A single slitting operation produces multiple finished strapping products that meet the required width. However, to accommodate existing single-reel uncoilers, these simultaneously produced strappings must undergo multiple subsequent processes, including splitting, manual or mechanical independent winding, and re-bundling, to become individual single-reel strappings. This process not only increases additional equipment investment and labor costs but also makes the strapping manufacturing process lengthy, complex, and less reliable.

[0007] In summary, the existing strapping feeding and uncoiling device has become a key bottleneck restricting the overall efficiency improvement of automatic strapping production lines for hot-rolled narrow strip steel. How to effectively solve problems such as insufficient strapping reel storage, inconvenient replacement, loose strapping feed, and complex manufacturing processes are technical challenges that urgently need to be overcome by those skilled in the art. Summary of the Invention

[0008] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a thick strapping reel uncoiling machine. The technical problem to be solved by the present invention is: how to provide a thick strapping reel uncoiling machine that can store multiple reels of strapping in groups, realize quick replacement, and maintain constant tension of the strapping during the feeding and receiving process to prevent slack, thereby meeting the needs of continuous and automated production.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a thick strapping reel uncoiling machine, comprising an uncoiling base, a lifting bracket, a rotary tray, a lifting hydraulic cylinder, a reduction motor, and a strapping reel assembly;

[0010] The lifting bracket is provided with an outer guide rail on its outer periphery, and the uncoiling base is provided with an inner guide rail on its inner periphery. The lifting bracket and the uncoiling base are connected in a sliding connection along the vertical direction through the cooperation of the outer guide rail and the inner guide rail.

[0011] The cylinder body of the lifting hydraulic cylinder is fixedly installed at the center of the uncoiling base, and the piston rod end of the lifting hydraulic cylinder is fixedly connected to the lifting bracket through a connecting plate to drive the lifting bracket and its upper components to perform lifting movements.

[0012] The lifting bracket is rotatably connected to the rotary tray via a rotary bearing, and the rotary tray is used to support and drive the strapping reel assembly to rotate.

[0013] The geared motor is fixedly mounted on the lifting bracket, and a pin gear is mounted on the output shaft of the geared motor;

[0014] A pin wheel is fixedly installed on the lower surface of the rotary tray. The pin wheel meshes with the pin gear to transmit the power of the geared motor to the rotary tray.

[0015] The strapping reel assembly is detachably stacked on a rotary tray, and the strapping reel assembly is composed of multiple independent strapping reels stacked coaxially.

[0016] In a preferred embodiment, an outer cone is fixed at the center of the upper end face of the rotary tray, and at least one upwardly protruding drive protrusion is also provided on the upper end face of the rotary tray.

[0017] The strapping reel assembly has an inner cone at its center, the shape of which matches the shape of the outer cone, to enable quick centering and positioning of the strapping reel assembly and the rotary pallet during installation.

[0018] The bottom plate of the strapping reel assembly is provided with a positioning groove, which cooperates with the drive protrusion to transmit the rotational torque of the rotary tray.

[0019] In a preferred embodiment, the strapping reel assembly includes a strapping bracket and a plurality of strapping reels. The strapping bracket has a fixing groove (902) for fixing the head of the strapping (14) during strapping preparation.

[0020] In a preferred embodiment, a thrust cover is fixedly installed on the upper end face of the lifting bracket. The thrust cover presses against the upper end face of the slewing bearing to limit the axial movement of the slewing tray.

[0021] In a preferred embodiment, a sealing ring is provided at the rotational fit gap between the lifting bracket and the rotary tray to prevent external dust and debris from entering the rotary bearing.

[0022] In a preferred embodiment, the lifting hydraulic cylinder is a closed-loop control hydraulic cylinder with an integrated linear position sensor, which is used to achieve precise control of the lifting height of the lifting support.

[0023] In a preferred embodiment, the geared motor is an AC variable frequency motor, which provides a reverse drag torque to the strapping reel assembly through a torque control mode during the feeding and take-up processes, thereby maintaining a constant tension in the strapping.

[0024] In a preferred embodiment, at least one detection switch is also installed on the unwinding base. The position of the detection switch corresponds to the working layer height of the strapping reel assembly and is used to detect the usage status of the strapping in the current working layer.

[0025] In a preferred embodiment, the pin wheel is fixedly connected to the lower flange of the rotary tray by bolts, and the pin shafts on the pin wheel are distributed in a ring array. The tooth profile of the pin gear matches the pin shaft, and the two constitute a pin-tooth transmission pair.

[0026] The technical effects and advantages of this invention are as follows:

[0027] 1. This invention designs the uncoiler as a rotary lifting structure consisting of a lifting bracket and a rotary tray, and sets an outer cone and a driving protrusion on the rotary tray to cooperate with the inner cone and positioning groove of the strapping reel assembly. This enables the rapid installation and positioning of grouped strapping reel assemblies composed of multiple strapping reels. It increases the strapping capacity of a single loading, allowing the bundling production line to operate continuously for a long time, completely avoiding downtime caused by frequent replacement of single-reel strapping, and significantly improving production efficiency. The grouped strapping method allows the strapping preparation process to be directly connected to the upstream slitting line, eliminating the steps of splitting and rewinding after slitting, and simplifying the preparation process.

[0028] 2. This invention, by setting a pin gear driven by an AC variable frequency reduction motor on the lifting support, and forming a pin-tooth transmission pair with the pin wheel under the rotary tray, can precisely control the rotation state of the rotary tray; when the baler feeds the strap, the reduction motor outputs a reverse torque, so that the strap remains taut under traction; when the strap is retracted, the reduction motor actively reverses, tightly wrapping the excess strap back onto the strapping reel; this constant tension control function solves the problems of strap slack, sagging, skew, and even falling off in the prior art, effectively eliminating equipment failures caused by strap jamming, and ensuring the continuity and stability of the baling operation;

[0029] 3. This invention employs a lifting support driven by a lifting hydraulic cylinder, combined with integrated linear position sensor closed-loop control, to achieve precise positioning and lifting of the strapping reel assembly. When the top layer of strapping is exhausted, the system can automatically control the lifting hydraulic cylinder to lift it upwards by the thickness of one strapping reel, allowing the next layer of strapping to precisely enter the working height. This automatic layer-changing function further reduces manual intervention and improves the automation level of the equipment. The entire process, from strapping preparation, installation, storage, tension control to automatic layer changing, has undergone systematic innovation, laying a solid foundation for the promotion and application of automatic strapping technology for hot-rolled narrow strip steel. Attached Figure Description

[0030] Figure 1 This is a schematic axial sectional view of the entire invention.

[0031] Figure 2 This is a schematic front sectional view of the present invention.

[0032] Figure 3 This is a top view of the present invention (the strapping reel assembly is hidden).

[0033] Figure 4 This is a schematic diagram of the strapping reel assembly of the present invention.

[0034] The attached figures are labeled as follows: 1 Uncoiling base, 2 Lifting bracket, 3 Rotary tray, 4 Lifting hydraulic cylinder, 5 Gear motor, 6 Thrust cover, 7 Rotary bearing, 8 Pin gear, 9 Strapping reel assembly, 10 Pin wheel, 11 Detection switch, 12 Connecting plate, 13 Sealing ring, 14 Strapping;

[0035] 101 inner guide rail;

[0036] 201 outer guide rail;

[0037] 301 drive bump, 302 outer cone;

[0038] 901 Inner cone, 902 Fixing groove, 903 Base plate with disc, 904 Positioning groove. Detailed Implementation

[0039] 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.

[0040] This invention discloses a thick strapping reel uncoiling machine, the specific structure of which is described in the appendix to the instruction manual. Figures 1 to 4 This uncoiler is designed to provide a stable and continuous supply of thick strapping for multi-coil automatic bundling equipment for hot-rolled narrow strip steel;

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a thick strapping reel uncoiling machine, the core structure of which includes an uncoiling base 1 as an overall support and guiding foundation, a lifting bracket 2 for carrying and lifting moving parts, a rotary tray 3 for driving and positioning the strapping reel assembly 9, a lifting hydraulic cylinder 4 as a lifting power source, a geared motor 5 as a rotation drive and tension control actuator, and a strapping reel assembly 9 as a consumable supplier.

[0042] Specifically, the uncoiling base 1 has a cylindrical structure with multiple vertically arranged inner guide rails 101 machined circumferentially on its inner wall. Correspondingly, the lifting bracket 2 has outer guide rails 201 circumferentially machined on its outer wall, matching the number and shape of the inner guide rails 101. The lifting bracket 2 is embedded in the inner guide rails 101 of the uncoiling base 1 via its outer guide rails 201, forming a precise sliding fit connection. This multi-guide rail structure ensures that the lifting bracket 2 has good guiding accuracy and torsional stiffness during lifting, guaranteeing smooth movement and verticality even when bearing the significant weight of the multi-layer strapping reel assembly 9.

[0043] like Figure 2As shown, the bottom of the lifting hydraulic cylinder 4 is fixedly mounted to the center bottom of the uncoiling base 1 via a flange and bolts. The piston rod of the lifting hydraulic cylinder 4 extends vertically upward, and its end is fixedly connected to the center bottom of the lifting bracket 2 via a rigid connecting plate 12. When the hydraulic system supplies oil to the lifting hydraulic cylinder 4, the piston rod extends or retracts, driving the entire lifting bracket 2 and all components mounted on it to perform precise lifting and lowering movements along the directions defined by the inner guide rail 101 and the outer guide rail 201 via the connecting plate 12. The lifting hydraulic cylinder 4 is preferably a closed-loop control hydraulic cylinder with a built-in or external linear position sensor (such as a magnetostrictive displacement sensor). The control system can read the precise position of the piston rod in real time, thereby achieving precise control of the lifting height of the lifting bracket 2 and ensuring the accuracy of each layer-changing operation.

[0044] like Figure 1 and Figure 3 As shown, a rotary tray 3 is rotatably connected above the lifting bracket 2 via a rotary bearing 7. Specifically, the outer ring of the rotary bearing 7 is fixedly connected to the upper flange of the lifting bracket 2, and its inner ring is fixedly connected to the lower flange of the rotary tray 3. The rotary bearing 7 is preferably a large-diameter crossed roller rotary bearing or a four-point contact ball rotary bearing, which can simultaneously withstand the axial load from the strapping reel assembly 9 and the radial load and overturning moment generated by the traction strapping, ensuring the smooth rotation and support rigidity of the rotary tray 3. To prevent axial movement of the rotary bearing 7, an annular thrust cap 6 is also bolted to the upper end face of the lifting bracket 2. The inner edge of the thrust cap 6 presses downward against the end face of the inner ring of the rotary bearing 7, serving as axial positioning and limiting. Meanwhile, at least one labyrinth-type or lip-shaped sealing ring 13 is provided at the fitting gap between the upper end face of the lifting bracket 2 and the lower surface of the rotary tray 3 to effectively prevent external dust, iron filings and other impurities from entering the interior of the rotary bearing 7, thereby improving the durability and maintenance cycle of the equipment.

[0045] The power transmission path for driving the rotary pallet 3 to rotate is as follows: The geared motor 5 is fixedly mounted on the lower surface of the lifting bracket 2 via its mounting flange. The output shaft of the geared motor 5 passes vertically upward through a pre-drilled hole on the lifting bracket 2, and a pin gear 8 is fixedly mounted at its shaft end. The pin gear 8 has teeth of a specific tooth profile machined on its circumference. Meshing with it is a pin wheel 10 fixedly mounted on the lower surface of the rotary pallet 3. The pin wheel 10 is annular, with several cylindrical or sleeve-shaped pins evenly distributed along its circumference. The teeth of the pin gear 8 are inserted into the gaps between adjacent pins, and through meshing, the rotational motion of the geared motor 5 is transmitted to the pin wheel 10, thereby driving the rotary pallet 3 to rotate around its central axis. The advantage of using a pin-gear transmission pair is that it has relatively low requirements for manufacturing and installation precision, and possesses good impact resistance and wear resistance, making it very suitable for use in the harsh working conditions of steel plant sites.

[0046] To achieve rapid, precise positioning and reliable torque transmission of the strapping reel assembly 9, this invention designs a specific positioning and drive interface. For example... Figure 1 , Figure 2 and Figure 4 As shown, a slewing flange with an upward protrusion is fixed at the center of the upper end face of the slewing pallet 3. The outer circumferential surface of the flange is machined into an outer cone 302 with a certain taper. The upper part of the outer cone 302 has a large guide cone angle, which facilitates coarse guidance during installation. On the upper surface of the slewing pallet 3 around the flange, a plurality of, for example, three or four, upward protruding drive bumps 301 are welded or integrally machined. These drive bumps 301 are evenly distributed on the circumference.

[0047] like Figure 4 As shown, the corresponding strapping reel assembly 9 is a modular structure comprising an integral central strapping support and multiple layers of straps 14 coaxially and tightly stacked thereon. The strapping support has a central inner conical sleeve 901, the shape and taper of which match the outer conical 302 on the rotary tray 3. At the bottom of the strapping support, on the bottom plate 903 of the lowest layer, are positioning grooves 904, corresponding one-to-one in number and position to the drive protrusions 301. Each single-layer strapping reel has a fixing groove 902 for inserting and securing the starting end of the strap 14 during preparation or replacement.

[0048] When the strapping reel assembly 9 needs to be replaced, the operator or hoisting equipment lifts the new strapping reel assembly 9 vertically onto the rotary pallet 3, and uses the guide opening at the lower end of the inner cone 901 to align with the guide cone angle at the upper end of the outer cone 302 of the rotary pallet 3 for initial alignment. As the strapping reel assembly 9 falls, the inner and outer cone surfaces cooperate to achieve automatic and precise alignment. At the same time, the strapping reel assembly 9 is slightly rotated so that the positioning groove 904 at the bottom aligns with the drive protrusion 301 on the rotary pallet 3, and finally falls completely into place. At this point, the strapping reel assembly 9 rests stably on the rotary pallet 3 under its own weight, with its entire weight supported by the rotary pallet 3 and the rotary bearing 7. The cooperation between the drive protrusion 301 and the positioning groove 904 not only restricts the circumferential rotation of the strapping reel assembly 9, but also constitutes a reliable connection for transmitting the torque of the geared motor 5.

[0049] To detect the usage status of the strapping, at least one detection switch 11, such as a photoelectric sensor or proximity switch, is installed on the unwinding base 1 or a separate bracket. The installation height of the detection switch 11 is set to align with the lower edge of the top working strapping reel or a specific position when the strapping is exhausted, and is used to send a signal to the control system that the current layer of strapping is about to run out or that there is no strapping left in the current layer, thereby triggering an automatic layer switching procedure.

[0050] The working process of this invention is as follows:

[0051] Strapping preparation and installation: After the upstream slitting unit completes the slitting of hot-rolled narrow strip steel, the resulting multiple strapping strips do not need to be separated. They are directly wound synchronously onto the strapping support of the strapping reel assembly by a dedicated winding device, forming a grouped strapping reel assembly 9 containing multiple strapping strips. The prepared strapping reel assembly 9 is hoisted and aligned using the guides of the inner cone 901 and the outer cone 302, and the positioning groove 904 engages with the drive protrusion 301, thus completing the installation in a very short time.

[0052] Continuous strapping operation: When the baler starts working, its traction mechanism clamps the head of the uppermost strap 14 and pulls it forward. At this time, the control system controls the AC variable frequency reduction motor 5 to be in torque control mode, outputting a constant torque in the opposite direction to the traction direction. This reverse torque is transmitted to the rotary tray 3 through the pin gear 8 and pin wheel 10, and then acts on the strapping reel assembly 9 through the drive protrusion 301, so that the strap 14 is always subjected to a reverse tension force during the feeding process. This mechanism ensures that the strap 14 is in a flat and taut state throughout the entire strapping path, without slack or wrinkles.

[0053] Automatic Strap Retraction and Tension Maintenance: After the baler completes one strap tightening action, some excess strapping length needs to be retracted. At this time, the drive unit on the baler pushes the strapping back in the opposite direction, while the control system controls the geared motor 5 to actively reverse. The geared motor 5 drives the rotary tray 3 to reverse at a preset torque value, actively and tightly rewinding the retracted excess strapping 14 back onto the strapping reel. Throughout the process, the strapping 14 maintains constant tension, completely eliminating slack, skewness, and slippage caused by gravity, ensuring smooth strapping for the next pass.

[0054] Automatic Layer Switching: When the top layer of strapping 14 is about to run out, the detection switch 11 detects a signal and transmits it to the control system. The system then issues a layer switching command, and the piston rod of the lifting hydraulic cylinder 4 extends precisely a preset distance under closed-loop control. This distance is exactly equal to the thickness of a single layer of strapping reel. The lifting hydraulic cylinder 4 pushes the lifting bracket 2 smoothly upward along the inner and outer guide rails 101 and 201 via the connecting plate 12, lifting the second layer of strapping reel to the original working height. The layer switching process is quick and smooth, requiring no manual intervention, and due to the precise control of the lifting action, it will not cause any impact or interruption to the ongoing bundling operation. This process is repeated until the entire strapping reel assembly 9 is used up.

[0055] Replacement of new reel: When a set of strapping reel assembly 9 is used up, the lifting hydraulic cylinder 4 retracts to the lowest position. The operator only needs to lift the empty strapping bracket away and repeat the installation steps to replace it with a new strapping reel assembly 9.

[0056] This invention clearly demonstrates that through a systematic and innovative design of the mechanical structure, drive method, and control logic, it integrates multiple independent strapping reels into a single unit for management, fundamentally solving the problems of insufficient strapping storage and complex preparation. By introducing a pin-tooth transmission mechanism driven by a variable frequency torque motor, it perfectly achieves constant tension control of the strapping, eliminating a series of malfunctions caused by strapping slack. Furthermore, by integrating a lifting mechanism with closed-loop position control, it achieves automatic and precise switching of strapping layers. The organic combination of these technical features enables the thick strapping reel uncoiler provided by this invention to achieve breakthroughs in automation, operational stability, production efficiency, and ease of maintenance, fully meeting the stringent requirements of modern continuous and efficient hot-rolled narrow strip steel bundling production lines.

[0057] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0058] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0059] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thick strapping reel uncoiling machine, comprising an uncoiling base (1), a lifting bracket (2), a rotary tray (3), a lifting hydraulic cylinder (4), a reduction motor (5), and a strapping reel assembly (9), characterized in that: The lifting bracket (2) is provided with an outer guide rail (201) on its outer periphery, and the unwinding base (1) is provided with an inner guide rail (101) on its inner periphery. The lifting bracket (2) and the unwinding base (1) are connected in a sliding connection along the vertical direction through the cooperation of the outer guide rail (201) and the inner guide rail (101). The cylinder body of the lifting hydraulic cylinder (4) is fixedly installed at the center of the uncoiling base (1). The piston rod end of the lifting hydraulic cylinder (4) is fixedly connected to the lifting bracket (2) through the connecting plate (12) to drive the lifting bracket (2) and its upper components to perform lifting movements. The lifting bracket (2) is rotatably connected to the rotary tray (3) via a rotary bearing (7), and the rotary tray (3) is used to support and drive the strapping reel assembly (9) to rotate; The geared motor (5) is fixedly installed on the lifting bracket (2), and a pin gear (8) is installed on the output shaft of the geared motor (5). A pin wheel (10) is fixedly installed on the lower surface of the rotary tray (3). The pin wheel (10) meshes with the pin gear (8) to transmit the power of the geared motor (5) to the rotary tray (3). The strapping reel assembly (9) is detachably stacked on the rotary tray (3), and the strapping reel assembly (9) is composed of multiple independent strapping reels stacked coaxially.

2. The thick strapping reel uncoiling machine according to claim 1, characterized in that: An outer cone (302) is fixed at the center of the upper end face of the rotary tray (3), and at least one upward protruding drive protrusion (301) is also provided on the upper end face of the rotary tray (3). The strapping reel assembly (9) has an inner cone (901) at its center, the shape of which matches the shape of the outer cone (302) to achieve quick centering and positioning of the strapping reel assembly (9) and the rotary tray (3) during installation. The bottom plate (903) of the strapping reel assembly (9) is provided with a positioning groove (904), which cooperates with the drive protrusion (301) to transmit the rotational torque of the rotary tray (3).

3. The thick strapping reel uncoiling machine according to claim 2, characterized in that: The strapping reel assembly (9) includes a strapping bracket and multiple strapping reels. The strapping bracket has a fixing groove (902) for fixing the head of the strapping (14) during strapping preparation.

4. The thick strapping reel uncoiling machine according to claim 1, characterized in that: A thrust cover (6) is fixedly installed on the upper end face of the lifting bracket (2). The thrust cover (6) presses against the upper end face of the slewing bearing (7) to limit the axial movement of the slewing tray (3).

5. The thick strapping reel uncoiling machine according to claim 1, characterized in that: A sealing ring (13) is provided at the rotational fit gap between the lifting bracket (2) and the rotary tray (3) to prevent external dust and debris from entering the rotary bearing (7).

6. The thick strapping reel uncoiling machine according to claim 1, characterized in that: The lifting hydraulic cylinder (4) is a closed-loop control hydraulic cylinder with an integrated linear position sensor, which is used to achieve precise control of the lifting height of the lifting support (2).

7. The thick strapping reel uncoiling machine according to claim 3, characterized in that: The geared motor (5) is an AC variable frequency motor, which provides reverse drag torque to the strapping reel assembly (9) through torque control mode during the feeding and take-up process, thereby maintaining the constant tension of the strapping (14).

8. The thick strapping reel uncoiling machine according to claim 1, characterized in that: At least one detection switch (11) is also installed on the unwinding base (1). The position of the detection switch (11) corresponds to the working layer height of the strapping reel assembly (9) and is used to detect the current working layer strapping usage status.

9. The thick strapping reel uncoiling machine according to claim 1, characterized in that: The pin wheel (10) is fixedly connected to the lower flange of the rotary tray (3) by bolts, and the pin shafts on the pin wheel (10) are distributed in a ring array. The tooth profile of the pin gear (8) matches the pin shaft, and the two constitute a pin-tooth transmission pair.

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