Shaft type pay-off rack with tension

The shaft-type pay-off stand with integrated tension and pay-off functions solves the adaptability and space utilization problems of existing pay-off stands, realizes the adaptation of multiple reels and miniaturized design, and has adjustable tension, making it suitable for scenarios with limited space.

CN120698293APending Publication Date: 2025-09-26GOLDEN TECH (DONGGUAN) WIRE &CABLE EQUIP CO LTD
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Patent Information

Application Number
CN202510904239.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2025-09-26

AI Technical Summary

Technical Problem

The existing shaft-type pay-off rack has a complex structure, is not convenient for adapting to different types of reels, occupies a large space, and has an inappropriate minimum tension. It is expensive and is not suitable for scenarios with limited space.

Method used

A tension-equipped shaft-type pay-off stand is designed, which integrates a tension mechanism and a pay-off stand, including a support mechanism, a tension mechanism, a pay-off mechanism, a winding mechanism and a reeling mechanism. The tension is adjusted by a servo motor and a telescopic cylinder, and the winding height is adjusted by a lifting motor. It is suitable for a variety of reels. The overall structure is simple and occupies a small space.

Benefits of technology

It is adaptable to a variety of cable drums, has adjustable tension, occupies a small space, is suitable for scenes with limited space, and the minimum tension can reach 1NM. It has a reasonable structural design and moderate cost.

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Abstract

The invention relates to the technical field of wire and cable equipment, in particular to a shaft type pay-off rack with tension, which comprises a supporting mechanism, the supporting mechanism comprises a frame, sealing plates are arranged on the side surfaces of the frame, an operation box is arranged at the top end of the frame, and an air storage tank is arranged at the bottom end of the side surface of the frame. An electric proportional valve is arranged in the middle of the side, provided with the tension mechanism, of the frame. The tension mechanism is arranged on one side of the supporting mechanism and comprises a supporting plate, the supporting plate is fixed to the side face of the frame through a plurality of short rods, and the bottom end of the side, away from the frame, of the supporting plate is rotationally connected with a first wire guide wheel; the pay-off mechanism is arranged on the side, provided with the tension mechanism, of the supporting mechanism. The device has the advantages of being simple in structure, reasonable in design, capable of being matched with different types of wire coils, capable of integrating the tension frame and the pay-off frame, small in occupied space, capable of being conveniently used when the site space is limited and small in minimum tension, and worthy of being vigorously popularized.
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Description

Technical Field

[0001] The present invention relates to the technical field of electric wire and cable equipment, and more particularly to a shaft-type pay-off stand with tension. Background Art

[0002] Wire and cable are widely used products, used in a variety of sectors, from businesses to the public. This dictates the diversity of their product forms. Depending on their specific requirements, they come in various wire counts and outer diameters, but the final product is always composed of several single wires or wound small strands. Regardless of the type of cable, during the production process, the strands that make up the cable product must be unwound from a storage reel, with specific directional and tension requirements. The reel itself has a limited length. When the reel runs out of wire, the empty reel must be removed and replaced with a fully loaded one. This necessitates timely replacement of the reels during the production process to meet production requirements.

[0003] After years of development in the wire and cable industry, the storage reels used for production turnover have been serialized and standardized. According to national standards, storage reels are divided into two types: shaft-type and shaftless. Among them, the shaft-type pay-off rack has a more complex structure, an unreasonable design, and is not convenient for loading, and is not suitable for scenarios with many types of reels; some tension racks and pay-off racks are not integrated together, occupying a large space, and are inconvenient to use when the site is limited; some pay-off racks have too large a minimum tension and are not suitable for use, and some pay-off racks are too expensive, which is not conducive to vigorous promotion.

[0004] In view of this, we propose a shaft-type pay-off stand with tension. Summary of the Invention

[0005] The purpose of the present invention is to provide a shaft-type pay-off stand with tension, which has a simple structure, reasonable design, can be adapted to different types of wire drums, and integrates a tension frame and a pay-off stand. It occupies a small space and is convenient for use when the site space is limited. It also has the advantage of low minimum tension, so as to solve the technical problems raised in the above background.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a shaft-type pay-off stand with tension, comprising: a support mechanism, the support mechanism comprising a frame, sealing plates being provided on both sides of the frame, an operating box being provided on the top of the frame, a gas storage tank being provided at the bottom end of the side of the frame, and an electric proportional valve being provided in the middle of the side of the frame where the tension mechanism is provided;

[0007] A tension mechanism is placed on one side of the support mechanism and includes a support plate fixed to the side of the frame via a plurality of short rods, and a bottom end of the support plate away from the frame is rotatably connected to a wire pulley;

[0008] A wire-releasing mechanism, the wire-releasing mechanism being placed on a side of the support mechanism where the tension mechanism is provided and being fixed to the top end of the side of the tension mechanism, and the wire-releasing mechanism comprising a support plate, a servo motor being mounted on the end of the support plate, the output end of the servo motor being arranged downward and being connected to a rotating plate;

[0009] A wire winding mechanism, comprising a rotating shaft, a wire winding reel being sleeved and mounted on the outer edge of the rotating shaft, a drive shaft being provided on the side of the wire winding reel facing the support mechanism, and a lifting bearing seat being provided on the end of the drive shaft away from the rotating shaft;

[0010] The loading mechanism is placed on the side of the support mechanism where the tension mechanism is provided, and is placed below the winding mechanism, and the loading mechanism includes a base plate, on which a slide is slidably mounted, and the upper end surface of the slide plate is symmetrically provided with two limit strips about the axis of the winding mechanism.

[0011] Preferably, the middle part of the support plate is rotatably connected to a rotating rod, one end of the rotating rod is rotatably connected to the support plate, and the other end is rotatably connected to a dancing wheel. Two limit plates are provided on the outside of the support plate, and the two limit plates are respectively placed on the upper and lower sides of the rotating rod.

[0012] Preferably, a telescopic cylinder is provided on the outer side of the support plate, the bottom end of the telescopic cylinder is rotatably connected to the bottom end of the support plate, and the output end of the telescopic cylinder is arranged upward and rotatably connected to the bottom end of the rotating rod.

[0013] Preferably, a displacement sensing cam is provided on the inner side of the support plate, the displacement sensing cam is fixedly connected to the rotating shaft of the rotating rod, and a displacement sensor is provided on the top of the displacement sensing cam.

[0014] Preferably, a second guide wheel is provided at one end of the outer side of the rotating plate, a third guide wheel is provided at the other end, and a limiting axis is provided at the bottom of the end of the rotating plate away from the second guide wheel. There are two limiting axes and they are placed below the third guide wheel.

[0015] Preferably, a nut for fixing the cable reel is provided at one end of the rotating shaft away from the driving shaft, and lifting screw rods are provided at both ends of the lifting bearing seat.

[0016] Preferably, a reducer connected to the drive shaft is provided at the end of the lifting bearing seat away from the drive shaft, a drive motor is provided at the top of the reducer, a drive motor is provided at the top of the lifting bearing seat, a mounting seat is provided at the top of the drive motor, and a lifting motor connected to the lifting screw is provided at the top of the mounting seat.

[0017] Preferably, handles are provided at both ends of the skateboard, and rollers are provided at both ends of each handle. Each roller extends out of the side of the skateboard and rolls to fit on the upper end surface of the base plate.

[0018] Preferably, one end of the substrate is placed under the winding mechanism, and the other end extends out of the winding mechanism, and discharge surfaces are opened on both sides of the end of the substrate extending out of the winding mechanism, and the height value of each discharge surface gradually decreases from the inside to the outside.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a shaft-type pay-off stand with tension, which includes a support mechanism, a tension mechanism, a pay-off mechanism, a winding mechanism, and a reeling mechanism. The overall structure is simple and the design is reasonable. The winding mechanism includes a rotating shaft, and a winding reel is installed on the outer edge of the rotating shaft. A driving shaft is provided on the side of the winding reel facing the support mechanism. A lifting bearing seat is provided at the end of the driving shaft away from the rotating shaft. A nut for fixing the winding reel is provided at the end of the rotating shaft away from the driving shaft. Lifting screws are provided at both ends of the lifting bearing seat. A speed reducer connected to the driving shaft is provided at the end of the lifting bearing seat away from the driving shaft. The machine has a driving motor on the top of the reducer, a driving motor on the top of the lifting bearing seat, a mounting seat on the top of the driving motor, and a lifting motor connected to the lifting screw on the top of the mounting seat. The driving motor cooperates with the reducer to drive the driving shaft to rotate, and the driving shaft drives the rotating shaft to rotate, and the winding reel is used to wind the wire. When unloading, the lifting motor cooperates with the lifting screw to drive the lifting bearing seat to rise and fall, and then the rotating shaft can be driven to rise and fall, and the height of the rotating shaft from the loading mechanism can be changed. It can realize the assembly of wire reels of multiple sizes and is suitable for scenarios with various types of wire reels. It is worthy of vigorous promotion.

[0021] 2. The tension mechanism in the present invention includes a support plate, which is fixed to the side of the frame through a number of short rods, and the bottom end of the support plate on the side away from the frame is rotatably connected to a wire pulley 1, a pay-off mechanism, and the pay-off mechanism is placed on the side of the support mechanism where the tension mechanism is provided, and is fixed to the top end of the side of the tension mechanism, and the pay-off mechanism includes a support plate, a servo motor is installed at the end of the support plate, the output end of the servo motor is set downward and is connected to a rotating plate, the wires and cables pass through the bottom end of the wire pulley 1, are wound to the top end of the dancing wheel, and then pass through the bottom end of the wire pulley 2, and then pass through the top end of the wire pulley 3, and pass through between the two limit shafts. The pay-off frame is integrated with the tension frame as one, and the overall space occupied is small, which is convenient for use when the venue space is limited.

[0022] 3. The tension mechanism of the present invention includes a support plate, which is fixed to the side of the frame by a number of short rods, and the bottom end of the support plate on the side away from the frame is rotatably connected to a wire pulley. A telescopic cylinder is provided on the outside of the support plate, and the bottom end of the telescopic cylinder is rotatably connected to the bottom end of the support plate, and the output end of the telescopic cylinder is set upward and rotatably connected to the bottom end of the rotating rod. A displacement sensing cam is provided on the inside of the support plate, and the displacement sensing cam is fixedly connected to the rotating shaft of the rotating rod, and a displacement sensor is provided on the top of the displacement sensing cam. The wires and cables pass through the bottom end of the wire pulley and are wound around the top of the dancing wheel. The rotating rod is driven to rotate by the telescopic cylinder and is limited by two limit plates. By changing the position of the dancing wheel, the purpose of changing the tension of the wires and cables is achieved. The displacement sensing cam connected to the rotating shaft of the rotating rod cooperates with the displacement sensor to monitor the position of the dancing wheel, and its minimum tension can reach 1NM. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view structural schematic diagram of the present invention;

[0024] Figure 2 It is a side structural schematic diagram of the present invention;

[0025] Figure 3 For the present invention Figure 1 Schematic diagram of the front structure of the intermediate tension mechanism;

[0026] Figure 4 For the present invention Figure 1 Rear view schematic diagram of the intermediate tension mechanism;

[0027] Figure 5 For the present invention Figure 1 Schematic diagram of the front structure of the winding mechanism;

[0028] Figure 6 For the present invention Figure 1 Schematic diagram of the front structure of the middle loading mechanism.

[0029] Description of the numbers in the figure:

[0030] 1. Support mechanism; 11. Frame; 12. Closing plate; 13. Operation box; 14. Gas tank; 15. Electric proportional valve; 2. Tension mechanism; 21. Support plate; 22. Rotating rod; 23. Dance wheel; 24. Limit plate; 25. Telescopic cylinder; 26. Wire pulley 1; 27. Displacement sensing cam; 28. Displacement sensor; 3. Pay-off mechanism; 31. Support plate; 32. Servo motor; 33. Rotating plate; 34. Wire pulley 2; 35. Wire pulley 3; 36. Limit shaft; 4. Winding mechanism; 41. Rotating shaft; 42. Winding reel; 43. Drive shaft; 44. Lifting bearing seat; 45. Lifting screw rod; 46. Reducer; 47. Drive motor; 48. Mounting seat; 49. Lifting motor; 5. Loading mechanism; 51. Base plate; 52. Slide plate; 53. Limit strip; 54. Handle; 55. Roller; 56. Discharge surface. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0034] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The present invention relates to a tensioned shaft-type pay-off stand, comprising a support mechanism 1, the support mechanism 1 comprising a frame 11, a sealing plate 12 being provided on each side of the frame 11, an operation box 13 being provided on the top of the frame 11, an air storage tank 14 being provided on the bottom end of the side of the frame 11, and an electric proportional valve 15 being provided in the middle of one side of the frame 11 on which the tension mechanism 2 is provided; a tension mechanism 2, the tension mechanism 2 being placed on one side of the support mechanism 1, and the tension mechanism 2 comprising a support plate 21, the support plate 21 being fixed to the side of the frame 11 by a plurality of short rods, and the bottom end of the side of the support plate 21 away from the frame 11 being rotatably connected to a wire wheel 26; a pay-off mechanism 3, the pay-off mechanism 3 being placed on the side of the support mechanism 1 on which the tension mechanism 2 is provided, and being fixed to the top end of the side of the tension mechanism 2, and the pay-off mechanism 3 comprising a support plate 31, a servo motor 32 being installed on the end of the support plate 31, the output end of the servo motor 32 being arranged downward, and It is connected to a rotating plate 33, and a rotating rod 22 is rotatably connected to the middle of the support plate 21. One end of the rotating rod 22 is rotatably connected to the support plate 21, and the other end is rotatably connected to the dancing wheel 23. Two limit plates 24 are provided on the outside of the support plate 21, and the two limit plates 24 are respectively placed on the upper and lower sides of the rotating rod 22. A telescopic cylinder 25 is provided on the outside of the support plate 21, and the bottom end of the telescopic cylinder 25 is rotatably connected to the bottom end of the support plate 21, and the output end of the telescopic cylinder 25 is set upward and rotatably connected to the bottom end of the rotating rod 22. A displacement sensing cam 27 is provided on the inside of the support plate 21, and the displacement sensing cam 27 is fixedly connected to the rotating axis of the rotating rod 22, and a displacement sensor 28 is provided on the top of the displacement sensing cam 27. A wire pulley 2 34 is provided at one end of the outer side of the rotating plate 33, and a wire pulley 3 35 is provided at the other end. A limiting shaft 36 is provided at the bottom of the end of the rotating plate 33 away from the wire pulley 2 34, and the limiting shaft 36 is placed below the wire pulley 3 35.

[0035] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4The wire and cable passes through the bottom end of the wire pulley 1 26 and is wound around the top of the dancing wheel 23. Then, it passes through the bottom end of the wire pulley 2 34, and then through the top end of the wire pulley 3 35, and passes between the two limit shafts 36. The rotating rod 22 is driven to rotate by the telescopic cylinder 25, and is limited by the two limit plates 24. By changing the position of the dancing wheel 23, the tension of the wire and cable is changed. The position of the dancing wheel 23 can be monitored by the displacement sensing cam 27 connected to the rotating shaft of the rotating rod 22 in cooperation with the displacement sensor 28. The minimum tension can be 1NM.

[0036] See also Figure 1 、 Figure 2 ,and Figure 5 , wherein the winding mechanism 4 includes a rotating shaft 41, a winding drum 42 is sleeved and installed on the outer edge surface of the rotating shaft 41, a driving shaft 43 is provided on the side of the winding drum 42 facing the supporting mechanism 1, a lifting bearing seat 44 is provided on the end of the driving shaft 43 away from the rotating shaft 41, a nut for fixing the winding drum 42 is provided on the end of the rotating shaft 41 away from the driving shaft 43, a lifting screw 45 is provided at both ends of the lifting bearing seat 44, a reducer 46 connected to the drive shaft 43 is provided on the end of the lifting bearing seat 44 away from the driving shaft 43, a driving motor 47 is provided on the top of the reducer 46, a driving motor 47 is provided on the top of the lifting bearing seat 44, a mounting seat 48 is provided on the top of the mounting seat 48, a lifting motor 49 connected to the lifting screw 45 is provided;

[0037] Please refer again Figure 1 、 Figure 2 ,and Figure 5 The driving motor 47 cooperates with the reducer 46 to drive the driving shaft 43 to rotate, and the driving shaft 43 drives the rotating shaft 41 to rotate, and the winding reel 42 is used to wind the wire. When unloading, the lifting motor 49 cooperates with the lifting screw 45 to drive the lifting bearing seat 44 to move up and down, and then the rotating shaft 41 can be driven to move up and down, and the height of the rotating shaft 41 from the loading mechanism 5 can be changed, so that the assembly of wire reels of various sizes can be realized. The lifting motor mounting seat is made movable and is equipped with a normally open proximity switch (not shown in the figure). When descending, when the edge of the wire reel touches the loading pulley, the mounting seat moves up, the proximity switch disengages, and the motor stops rotating, so that wire reels of different sizes can be loaded and unloaded.

[0038] See also Figure 1 、 Figure 2 and Figure 6The loading mechanism 5 includes a base plate 51, on which a slide plate 52 is slidably mounted. Two limit bars 53 are symmetrically arranged on the upper end surface of the slide plate 52 about the axis of the winding mechanism 4. Handles 54 are arranged at both ends of the slide plate 52. Rollers 55 are arranged at both ends of each handle 54. Each roller 55 extends from the side of the slide plate 52 and rolls to fit the upper end surface of the base plate 51. One end of the base plate 51 is placed below the winding mechanism 4, and the other end extends to the outside of the winding mechanism 4. Discharging surfaces 56 are provided on both sides of the end of the base plate 51 extending from the winding mechanism 4, and the height of each discharging surface 56 gradually decreases from the inside to the outside.

[0039] Please refer again Figure 1 、 Figure 2 and Figure 6 The slide plate 52 is supported by the roller 55 to slide on the base plate 51. When the cable drum 42 is located between the two limit bars 53, the handle 54 is pulled to pull the slide plate 52 to the discharge surface 56. The two discharge surfaces 56 are opened to facilitate the removal of the cable drum 42.

[0040] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A tensioned shaft-type pay-off stand, characterized in that: include: A support mechanism (1), the support mechanism (1) comprising a frame (11), a sealing plate (12) being provided on each side of the frame (11), an operating box (13) being provided at the top of the frame (11), a gas storage tank (14) being provided at the bottom end of the side of the frame (11), and an electric proportional valve (15) being provided in the middle of one side of the frame (11) where the tension mechanism (2) is provided; A tension mechanism (2) is placed on one side of the support mechanism (1), and the tension mechanism (2) includes a support plate (21), the support plate (21) is fixed to the side of the frame (11) through a plurality of short rods, and the bottom end of the support plate (21) away from the frame (11) is rotatably connected to a wire wheel (26), the middle part of the support plate (21) is rotatably connected to a rotating rod (22), one end of the rotating rod (22) is rotatably connected to the support plate (21), and the other end is rotatably connected to a dancing wheel (23), two limit plates (24) are provided on the outside of the support plate (21), and the two limit plates (24) are respectively placed on the upper and lower sides of the rotating rod (22), a telescopic cylinder (25) is provided on the outside of the support plate (21), the bottom end of the telescopic cylinder (25) is rotatably connected to the bottom end of the support plate (21), and the output end of the telescopic cylinder (25) is arranged upward and rotatably connected to the bottom end of the rotating rod (22); A wire-releasing mechanism (3) is disposed on a side of the support mechanism (1) on which the tension mechanism (2) is provided, and is fixed to the top end of the side of the tension mechanism (2). The wire-releasing mechanism (3) includes a support plate (31), a servo motor (32) is mounted on the end of the support plate (31), and an output end of the servo motor (32) is disposed downward and is connected to a rotating plate (33). A wire winding mechanism (4), the wire winding mechanism (4) comprising a rotating shaft (41), a wire winding drum (42) being sleeved and mounted on the outer edge surface of the rotating shaft (41), a driving shaft (43) being provided on the side of the wire winding drum (42) facing the supporting mechanism (1), and a lifting bearing seat (44) being provided on the end of the driving shaft (43) away from the rotating shaft (41); A loading mechanism (5) is provided, the loading mechanism (5) being arranged on a side of the support mechanism (1) provided with the tension mechanism (2) and being arranged below the winding mechanism (4), and the loading mechanism (5) comprising a base plate (51), a slide plate (52) being slidably mounted on the base plate (51), and two limit bars (53) being symmetrically provided on the upper end surface of the slide plate (52) about the axis of the winding mechanism (4).

2. A tensioned shaft-type pay-off stand according to claim 1, characterized in that: A displacement sensing cam (27) is provided on the inner side of the support plate (21), the displacement sensing cam (27) is fixedly connected to the rotating shaft of the rotating rod (22), and a displacement sensor (28) is provided on the top of the displacement sensing cam (27).

3. The tensioned shaft-type pay-off stand according to claim 1, characterized in that: A second guide wheel (34) is provided at one end of the outer side of the rotating plate (33), and a third guide wheel (35) is provided at the other end. A limiting shaft (36) is provided at the bottom of one end of the rotating plate (33) away from the second guide wheel (34), and the limiting shaft (36) is placed below the third guide wheel (35).

4. The tensioned shaft-type pay-off stand according to claim 1, characterized in that: A nut for fixing the cable reel (42) is provided at one end of the rotating shaft (41) away from the driving shaft (43), and lifting screw rods (45) are provided at both ends of the lifting bearing seat (44).

5. The tensioned shaft-type pay-off stand according to claim 4, characterized in that: A reducer (46) connected to the drive shaft (43) is provided at one end of the lifting bearing seat (44) away from the drive shaft (43), a drive motor (47) is provided at the top end of the reducer (46), a drive motor (47) is provided at the top end of the lifting bearing seat (44), a mounting seat (48) is provided at the top end of the drive motor (47), and a lifting motor (49) connected to the lifting screw rod (45) is provided at the top end of the mounting seat (48).

6. The tensioned shaft-type pay-off stand according to claim 1, characterized in that: Both ends of the slide plate (52) are provided with handles (54), and both ends of each handle (54) are provided with rollers (55). Each roller (55) extends out of the side of the slide plate (52) and rolls to fit the upper end surface of the base plate (51).

7. The tensioned shaft-type pay-off stand according to claim 1, characterized in that: One end of the substrate (51) is placed below the winding mechanism (4), and the other end extends out of the winding mechanism (4). Discharging surfaces (56) are provided on both sides of the end of the substrate (51) extending out of the winding mechanism (4), and the height of each discharging surface (56) gradually decreases from the inside to the outside.