Unwinding mechanism

Abstract

The invention discloses an unwinding mechanism, and belongs to the field of unwinding devices. The unwinding mechanism comprises a pair of side vertical plates which are arranged in parallel, and at least two connecting cross beams are connected between the two side vertical plates; a first tensioning roller, a third tensioning roller, a second tensioning roller, a first adjusting roller, a second adjusting roller, a first guide roller and a second guide roller are further connected between the two side vertical plates. A base material led out of a material coil sequentially passes through the first tensioning roller, the third tensioning roller, the second tensioning roller, the first adjusting roller, the second adjusting roller, the first guide roller and the second guide roller. And a static elimination rod is connected between the two side vertical plates between the second adjusting roller and the first guide roller. According to the electrostatic eliminating device, the electrostatic eliminating rod is integrally installed on the unwinding path, the distance between the electrostatic eliminating rod and the base material is accurately controlled to be within the range of 1-5 cm, electrostatic charges generated by friction of the surface of the base material are efficiently neutralized, and the situation that the base material carrying the electrostatic charges adsorbs dust and impurities in the environment in the conveying process is avoided.

Description

Technical Field

[0001] This invention relates to the field of unwinding devices, and particularly to an unwinding mechanism. Background Technology

[0002] In industrial manufacturing, particularly in production lines processing flexible roll materials such as films, foils, and nonwoven fabrics, the unwinding mechanism, as the starting point of the entire process, directly determines the product quality and production efficiency of subsequent processes (such as coating, printing, lamination, and drying). During the unwinding and transport of these roll materials, continuous and high-speed friction, contact, and separation with various guide rollers are inevitable. A natural byproduct of this physical interaction is the generation and accumulation of static charge.

[0003] The accumulation of static charge can lead to a series of production problems: First, the charged substrate surface will attract dust and impurities from the environment, affecting the quality of subsequent coating, drying and other processes, resulting in product defects; second, during high-speed unwinding, electrostatic discharge may generate electric sparks, posing a safety hazard in production environments containing flammable solvents or dust; in addition, static electricity can cause the substrates to stick together or repel each other, resulting in uneven unwinding, wrinkling or even breakage, affecting production efficiency and continuity.

[0004] In the existing technology, the common practice for static electricity elimination is to install an additional static eliminator at a separate workstation in the later part of the production line. However, the path from the generation of static electricity to its elimination is too long. During this period, the generation and accumulation of static charge has already adsorbed dust and impurities in the environment. Summary of the Invention

[0005] This invention provides an unwinding mechanism that can solve the problem in the prior art where the generation and accumulation of static charge causes the substrate surface to adsorb dust and impurities from the environment.

[0006] An unwinding mechanism includes a pair of parallel side plates, with at least two connecting beams connecting the two side plates; one side of each side plate has a stepped portion for placing the material roll; a first tension roller, a second tension roller, a first adjusting roller, a second adjusting roller, a first guide roller, and a second guide roller are also connected between the two side plates, and a third tension roller is located below the first tension roller and the second tension roller; the substrate drawn from the material roll passes sequentially through the first tension roller, the third tension roller, the second tension roller, the first adjusting roller, the second adjusting roller, the first guide roller, and the second guide roller; an antistatic rod is connected between the two side plates located between the second adjusting roller and the first guide roller, and the distance between the antistatic rod and the substrate is between 1cm and 5cm.

[0007] Furthermore, a rectangular slot is formed by an inwardly recessed side wall of the stepped portion; the material roll is assembled on the outside of a take-up shaft, and a first drive block is respectively provided at both ends of the take-up shaft, with a pair of parallel planes formed on the outer side of the first drive block; rolling bearings that are locked in the rectangular slot are respectively assembled at both ends of the take-up shaft; an annular groove is provided on the outer periphery of the rolling bearing; a housing is installed on the outer wall of one of the side upright plates, and a rotary motor is installed on the inner wall of the housing. The output end of the rotary motor is connected to a second drive block through a coupling, and the second drive block is rotatably mounted on the side wall of the housing; a rectangular slot for the insertion of the first drive block is provided on the second drive block, and a guide portion is provided at the end of the rectangular slot.

[0008] Furthermore, a first pin hole is provided through the top of the side plate located at the rectangular slot, and a second pin hole is provided on the outer ring of the rolling bearing to cooperate with the first pin hole; after installation, a control pin is passed through the first pin hole and inserted into the second pin hole.

[0009] Furthermore, a groove is vertically arranged at one end of the side plate, and a vertical guide rail is provided on the inner bottom side of the groove, with a slider fitted on the guide rail; a first telescopic cylinder is installed on the top of the groove, and the output end of the first telescopic cylinder is connected to the top side of the slider; a support block is provided on the top of one side of the slider, and an arc-shaped groove is formed on the support block; the width of the slider is smaller than the width of the annular groove.

[0010] Furthermore, an equipment compartment is provided on the outer wall of one of the side panels; a first bearing seat is fixedly installed on the inner wall surface of both side panels, and a rotating shaft is installed on each of the two first bearing seats. The end of the rotating shaft is connected to a swing arm, and a connecting beam is connected between the two swing arms. The two ends of the third tension roller are assembled on the two swing arms; a limiting structure is installed on the inner wall surface of at least one of the side panels, and the end of the limiting structure abuts against the end side surface of the swing arm; a drive motor is installed in the equipment compartment, and the output end of the drive motor is connected to the end of a rotating shaft through a coupling.

[0011] Furthermore, the limiting structure includes a fixing seat fixed to the inner wall of the side plate, a stud threaded onto the fixing seat, an end of the stud connected to a mounting block, a through hole on the mounting block, an elastic telescopic rod passing through the through hole, two limiting rings detachably mounted on the outer side of the elastic telescopic rod; the two limiting rings respectively abut against both sides of the mounting block; and a rubber abutment block abutting against the side of the swing arm end is installed at the end of the elastic telescopic rod.

[0012] Furthermore, each of the two side plates is provided with a rectangular hole, and a movable plate is provided in the rectangular hole. A guide block is provided on the outer wall of the movable plate. A second bearing seat is fixed on the inner wall of the movable plate, and the two ends of the first adjusting roller are respectively assembled on the two second bearing seats. An upper fixing plate and a lower fixing plate are respectively fixed on the outer wall of the side plate located at the top and bottom of the rectangular hole. A guide rod passing through the guide block is connected between the upper fixing plate and the lower fixing plate. An adjusting cylinder is installed on the upper fixing plate, and a connecting block is connected to the output end of the adjusting cylinder. The connecting block is fixed on the movable plate.

[0013] Furthermore, a boss is fixed to the inner wall of the side plate located at the top of the rectangular hole, and an L-shaped plate with a horizontal section located directly above the boss is fixed to the inner wall of the movable plate; a distance sensor is installed on the boss and / or the L-shaped plate.

[0014] Furthermore, a mounting beam is connected between the two side uprights, and a telescopic structure is installed on the bottom side of the mounting beam. A "["-shaped fixing frame is installed at the end of the telescopic structure; the two ends of the first guide roller are respectively assembled on the two opposite inner walls of the fixing frame.

[0015] Furthermore, the telescopic structure includes at least one second telescopic cylinder installed on the bottom side of the mounting beam. The bottom side of the mounting beam is also fixed with a guide sleeve by a vertical plate. A movable column is provided through the guide sleeve. The bottom end of the movable column is fixed on the fixed frame, and the top end is connected to the output end of the second telescopic cylinder.

[0016] 1. This invention integrates and installs an electrostatic eliminator on the unwinding path and precisely controls the distance between it and the substrate within the range of 1cm-5cm. This effectively neutralizes the static charge generated by friction on the substrate surface and prevents the substrate carrying static charge from adsorbing dust and impurities in the environment during transportation.

[0017] 2. In this invention, the material roll is placed in the rectangular slot of the stepped section by rolling bearings at both ends of the take-up shaft. The drive end uses a second drive block with a guide portion to be inserted into the first drive block, realizing rapid alignment and power connection of the material roll, greatly shortening the time for changing material rolls and improving production efficiency.

[0018] 3. The third tensioning roller of the present invention is connected to the drive motor through the swing arm to form an active tension adjustment unit that can swing. Combined with the flexible limiting structure composed of studs, elastic telescopic rods and rubber blocks, it can realize dynamic and precise adjustment of the tension of the substrate, and effectively buffer the impact to ensure constant tension. Attached Figure Description

[0019] Figure 1 A top-view structural schematic diagram of the unwinding mechanism is provided for this invention; Figure 2 Provided for the present invention Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 Provided for the present invention Figure 1 Enlarged view of a section at point B in the middle; Figure 4 Provided for the present invention Figure 1 Enlarged view of a section at point C; Figure 5 Provided for the present invention Figure 1 Enlarged view of a section at point E in the middle; Figure 6 A schematic diagram of the unwinding mechanism from a low angle is provided for this invention; Figure 7 Provided for the present invention Figure 6 Enlarged view of a section at point F in the middle; Figure 8 A top view of the unwinding mechanism is provided for this invention; Figure 9 Provided for the present invention Figure 8 Sectional view at point AA; Figure 10 Provided for the present invention Figure 9 Enlarged view of a section at point D.

[0020] Explanation of reference numerals in the attached figures: 1-Side upright plate, 3-Connecting crossbeam, 4-Mounting crossbeam, 5-Movable plate, 6-Equipment compartment, 10-Material roll, 11-Step section, 12-Shell, 13-Second drive block, 14-Trough, 15-Support block, 16-First telescopic cylinder, 17-Rectangular hole, 18-Upper fixed plate, 19-Lower fixed plate, 20-First tension roller, 30-Third tension roller, 31-First bearing seat, 32-Swing arm, 33-Fixed seat, 34-Connecting beam, 35-Stud, 36-Mounting block, 37-Elastic telescopic rod, 38-Limiting ring, 39-Rubber abutment, 40-Second tension roller, 41-Second telescopic cylinder, 42-Vertical plate, 43-Guide sleeve, 44-Movable column, 45-Fixed frame, 50-First adjusting roller, 51-Guide block. 52-Connecting block, 53-L-shaped plate, 60-Second adjusting roller, 70-Static eliminator rod, 80-First guide roller, 90-Second guide roller, 100-Base material, 102-Rewinding shaft, 103-First driving block, 104-Flat surface, 105-Rolling bearing, 106-Annular groove, 111-Rectangular slot, 112-First pin hole, 131-Rectangular groove, 132-Guide part, 141-Guide rail, 142-Slider, 151-Arc groove, 181-Guide rod, 182-Adjusting cylinder, 183-Boss. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] like Figure 1 and Figure 6 As shown in the figure, an unwinding mechanism provided in this embodiment of the invention includes a pair of parallel side plates 1, and two connecting beams 3 are connected between the two side plates 1 for reinforcement, forming a stable frame.

[0023] like Figure 1 , 6 As shown in Figures 8-9, a first tensioning roller 20, a second tensioning roller 40, a first adjusting roller 50, a second adjusting roller 60, a first guide roller 80, and a second guide roller 90 are connected between the two side uprights 1. A stepped portion 11 for placing the material roll 10 is provided on one side of the side uprights 1. During the unwinding process, the substrate 100 drawn from the material roll 10 is controlled to pass sequentially through the first tensioning roller 20, the third tensioning roller 30, the second tensioning roller 40, the first adjusting roller 50, the second adjusting roller 60, the first guide roller 80, and the second guide roller 90. An electrostatic eliminator 70 is connected between the two side uprights 1 located between the second adjusting roller 60 and the first guide roller 80. The vertical distance between the electrostatic eliminator 70 and the substrate 100 is 1cm-5cm to ensure the best electrostatic neutralization effect. The third tensioning roller 30 is located below the first tensioning roller 20 and the second tensioning roller 40.

[0024] To facilitate tension adjustment, an equipment compartment 6 is provided on the outer wall of one side of the upright plate 1; for example... Figure 6-7 Each of the two upright plates 1 has a first bearing seat 31 fixedly installed on its inner wall surface. Each of the two first bearing seats 31 has a rotating shaft installed on it. The end of the rotating shaft is connected to a swing arm 32. A connecting beam 34 is connected between the two swing arms 32. The two ends of the third tension roller 30 are assembled on the two swing arms 32. At least one of the upright plates 1 has a limit structure installed on its inner wall surface. The end of the limit structure abuts against the end side of the swing arm 32. A drive motor is installed in the equipment compartment 6. The output end of the drive motor is connected to the end of a rotating shaft through a coupling. The first tension roller 20, the second tension roller 40, and the swingable third tension roller 30 constitute an active tension control system. By controlling the swing angle of the third tension roller 30, the drive motor can adjust the wrap angle and tension of the substrate 100 in real time, quickly respond to tension changes caused by changes in the diameter of the roll or speed fluctuations, and maintain constant tension.

[0025] The limiting structure includes a fixing seat 33 fixed to the inner wall of the side plate 1. A stud 35 is threaded onto the fixing seat 33. The end of the stud 35 is connected to a mounting block 36. A through hole is provided on the mounting block 36, and an elastic telescopic rod 37 is inserted through the through hole. Two limiting rings 38 are detachably installed on the outer side of the elastic telescopic rod 37. The two limiting rings 38 abut against the two sides of the mounting block 36 respectively. A rubber abutment 39 is installed at the end of the elastic telescopic rod 37, which abuts against the side of the swing arm 32. During use, the telescopic rod 37 can be adjusted by installing or removing the limiting rings 38. 7. At the installation position of the through hole, the swing range of the swing arm 32 can be precisely set, thereby setting the upper and lower limits of the tension; the elastic telescopic rod 37 and the rubber block 39 provide flexible buffer contact, avoiding equipment damage and tension sudden changes caused by rigid impact, making tension control more stable and precise; and by turning the stud 35, it is convenient to adjust the rotation of the mounting block 36 relative to the side plate 1, thereby facilitating the control of the axial direction of the through hole during use, and thus ensuring that the rubber block 39 can fit against the end side of the swing arm 32 as much as possible.

[0026] To facilitate the support, installation and disassembly of the material roll 10, a step 11 for placing the material roll 10 is provided on one side of the side plate 1.

[0027] like Figure 5 The material roll 10 is assembled on the outside of a take-up shaft 102. The two ends of the take-up shaft 102 are respectively provided with a first drive block 103. A pair of parallel planes 104 are formed on the outside of the first drive block 103. The two ends of the take-up shaft 102 are respectively equipped with rolling bearings 105 that are locked in rectangular slots 111. The outer periphery of the rolling bearings 105 is provided with an annular groove 106.

[0028] like Figure 1-2 A rectangular slot 111 is formed by an inwardly recessed side wall of the stepped portion 11. A housing 12 is installed on the outer wall of one side plate 1, and a rotary motor is installed on the inner wall of the housing 12. The output end of the rotary motor is connected to a second drive block 13 via a coupling. The second drive block 13 is rotatably mounted on the side wall of the housing 12. A rectangular slot 131 for the insertion of a first drive block 103 is provided on the second drive block 13. A guide portion 132 is provided at the port of the rectangular slot 131. A groove 14 is also vertically provided at one end of the side plate 1. A vertical guide rail 141 is provided on the inner bottom side of the groove 14. A slider 142 is fitted on the guide rail 141. A first telescopic cylinder 16 is installed on the top of the groove 14. The output end of the first telescopic cylinder 16 is connected to the top side of the slider 142. A support block 15 is provided on the top side of one side of the slider 142. An arc-shaped groove 151 is formed on the support block 15. The width of the slider 142 is smaller than the width of the annular groove 106.

[0029] The installation process of material roll 10 includes: First, control the first telescopic cylinder 16 to extend, causing the slider 142 to move to the lowest end; Control the horizontal movement of the material roll 10 so that the annular grooves 106 of the rolling bearings 105 at both ends of the winding shaft 102 are engaged in the arc-shaped grooves 151 of the support block 15. Controlling the first telescopic cylinder 16 to retract drives the slider 142 to move to the top, at which point the upper surface of the support block 15 and the step portion 11 are coplanar; Under the action of the rolling bearing 105, it is controlled to move along the upper surface of the support block 15 and the step portion 11 until it moves into the rectangular slot 111. The first drive block 103 is controlled to engage in the rectangular groove 131 of the second drive block 13 under the action of the guide part 132. At this time, the rotation of the rotary motor can be controlled to drive the material roll 10 to rotate through the cooperation of the second drive block 13 and the first drive block 103, thereby completing the active unwinding.

[0030] A first pin hole 112 is provided through the top of the side plate 1 located at the rectangular slot 111, and a second pin hole is provided on the outer ring of the rolling bearing 105 to cooperate with the first pin hole 112. After installation, a control pin is passed through the first pin hole 112 and inserted into the second pin hole. The pin is used to position and fix both ends of the material roll 10 to prevent the material roll 10 from falling off from the rectangular slot 111.

[0031] In order to adjust the vertical distance between the static eliminator 70 and the substrate 100, the installation height of the first adjusting roller 50 and the first guide roller 80 of the present invention can be adjusted.

[0032] Specifically, such as Figure 3-4 Both side plates 1 are provided with rectangular holes 17, and movable plates 5 are provided inside the rectangular holes 17. Guide blocks 51 are provided on the outer walls of the movable plates 5. Second bearing seats are fixed on the inner walls of the movable plates 5, and the two ends of the first adjusting roller 50 are respectively mounted on the two second bearing seats. Upper fixed plates 18 and lower fixed plates 19 are respectively fixed on the outer walls of the side plates 1 located at the top and bottom of the rectangular holes 17. A guide rod 181 passing through the guide block 51 is connected between the upper fixed plates 18 and the lower fixed plates 19. An adjusting cylinder 182 is installed on the upper fixed plate 18, and the output end of the adjusting cylinder 182 is connected to A connecting block 52 is attached and fixed to the movable plate 5. A boss 183 is fixed to the inner wall of the side plate 1 located at the top of the rectangular hole 17. An L-shaped plate 53 with a horizontal section located directly above the boss 183 is fixed to the inner wall of the movable plate 5. A distance sensor is installed on the boss 183. In use, controlling the extension and retraction of the adjusting cylinder 182 can drive the movable plate 5 to move up and down. The up and down movement of the movable plate 5 can drive the first adjusting roller 50 to move up and down. The distance sensor detects the distance between the boss 183 and the L-shaped plate 53 and monitors the height position of the first adjusting roller 50 in real time.

[0033] Specifically, such as Figure 10 A mounting beam 4 is connected between two side uprights 1. A telescopic structure is installed on the bottom side of the mounting beam 4, and a "["-shaped fixing frame 45 is installed at the end of the telescopic structure. The telescopic structure includes two second telescopic cylinders 41 installed on the bottom side of the mounting beam 4. A guide sleeve 43 is also fixed on the bottom side of the mounting beam 4 through a vertical plate 42. A movable column 44 is installed through the guide sleeve 43. The bottom end of the movable column 44 is fixed on the fixing frame 45, and the top end is connected to the output end of the second telescopic cylinder 41. The two ends of the first guide roller 80 are respectively assembled on the two opposite inner walls of the fixing frame 45. The extension and retraction of the second telescopic cylinder 41 can drive the fixing frame 45 to move up and down in the vertical direction, thereby adjusting the installation height of the first guide roller 80.

[0034] In use, the installation height of the first adjusting roller 50 and the first guide roller 80 can be adjusted to adjust the distance between the substrate 100 passing through the first adjusting roller 50 and the first guide roller 80 and the static elimination rod 70, which is suitable for the static elimination needs of substrates 100 of different materials.

[0035] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A pay-off mechanism, characterized by The application relates to a material roll placing device, which comprises a pair of parallel side vertical plates (1) and at least two connecting cross beams (3) connected between the side vertical plates (1). One side of the side vertical plate (1) is provided with a stepped part (11) for placing a material roll (10); First and second tension rollers (20 and 40), first and second adjusting rollers (50 and 60), first and second guide rollers (80 and 90) are further connected between the two side vertical plates (1), and a third tension roller (30) is arranged below the first and second tension rollers (20 and 40); The base material (100) drawn from the material roll (10) sequentially passes through the first tension roller (20), the third tension roller (30), the second tension roller (40), the first adjusting roller (50), the second adjusting roller (60), the first guide roller (80) and the second guide roller (90); An electrostatic elimination rod (70) is connected between the two side vertical plates (1) between the second adjusting roller (60) and the first guide roller (80), and the distance between the electrostatic elimination rod (70) and the base material (100) is 1-5 cm.

2. A pay-off mechanism as claimed in claim 1, characterized in that The side wall of the stepped part (11) is inwardly recessed to form a rectangular notch (111); The material roll (10) is assembled outside a winding shaft (102), the two ends of the winding shaft (102) are respectively provided with first driving blocks (103), the outer side of the first driving blocks (103) forms a pair of parallel planes (104), the two ends of the winding shaft (102) are respectively provided with rolling bearings (105) clamped at the rectangular notches (111), and the outer circumferential side of the rolling bearings (105) is provided with annular grooves (106); A housing (12) is mounted on the outer wall of one side vertical plate (1), a rotary motor is mounted on the inner wall of the housing (12), the output end of the rotary motor is connected with a second driving block (13) through a shaft coupling, and the second driving block (13) is rotatably mounted on the side wall of the housing (12); A rectangular groove (131) for inserting the first driving block (103) is formed in the second driving block (13), and a guide part (132) is arranged at the port of the rectangular groove (131).

3. A pay-off mechanism as claimed in claim 2, characterized in that A first pin hole (112) is arranged through the top of the side vertical plate (1) at the rectangular notch (111), and the outer ring of the rolling bearing (105) is provided with a second pin hole matched with the first pin hole (112); After installation, a pin rod is arranged through the first pin hole (112) and inserted into the second pin hole.

4. A pay-off mechanism as claimed in claim 2, wherein, A groove (14) is vertically arranged at one end of the side vertical plate (1), a vertical guide rail (141) is arranged on the inner bottom side of the groove (14), and a sliding block (142) is arranged on the guide rail (141) in a matched mode; A first telescopic cylinder (16) is mounted on the top of the groove (14), and the output end of the first telescopic cylinder (16) is connected to the top side of the sliding block (142). The side top of the sliding block (142) is provided with a support block (15), and an arc-shaped groove (151) is formed on the support block (15); the width of the sliding block (142) is less than the width of the annular groove (106).

5. A pay-off mechanism as claimed in claim 1, characterized in that An outer wall of one of the side vertical plates (1) is provided with an equipment bin (6); The inner wall surface of each of the two side vertical plates (1) is fixedly provided with a first bearing seat (31), and a rotating shaft is arranged on each of the two first bearing seats (31); the end of the rotating shaft is connected with a swing arm (32), and the two swing arms (32) are connected with a connecting beam (34); and the two ends of the third tensioning roller (30) are assembled on the two swing arms (32). The inner wall surface of at least one of the side vertical plates (1) is provided with a limiting structure, and the end of the limiting structure abuts against the end side surface of the swing arm (32). A driving motor is arranged in the equipment bin (6), and the output end of the driving motor is connected with the end of a rotating shaft through a shaft coupling.

6. A pay-off mechanism as claimed in claim 5, characterized in that The limiting structure comprises a fixing seat (33) fixed to the inner wall surface of the side vertical plate (1), a threaded hole is formed in the fixing seat (33), and a threaded stud (35) is arranged in the threaded hole; the end of the threaded stud (35) is connected with a mounting block (36), a through hole is formed in the mounting block (36), and an elastic telescopic rod (37) is arranged in the through hole; and two limiting rings (38) are detachably arranged on the outer side of the elastic telescopic rod (37). The two limiting rings (38) are arranged on the two sides of the mounting block (36) respectively; and a rubber abutting block (39) is arranged on the end of the elastic telescopic rod (37) and abuts against the end side surface of the swing arm (32).

7. A pay-off mechanism as claimed in claim 1, characterized in that Rectangular holes (17) are formed in the two side vertical plates (1) respectively, and a movable plate (5) is arranged in each of the rectangular holes (17); and a guide block (51) is arranged on the outer side wall of the movable plate (5). A second bearing seat is fixed to the inner wall surface of the movable plate (5), and the two ends of the first adjusting roller (50) are assembled on the two second bearing seats respectively. Upper and lower fixed plates (18) and (19) are fixed to the outer wall surfaces of the side vertical plates (1) located at the top and bottom positions of the rectangular holes (17) respectively, and a guide rod (181) penetrating through the guide block (51) is arranged between the upper and lower fixed plates (18) and (19). An adjusting cylinder (182) is arranged on the upper fixed plate (18), and a connecting block (52) is connected to the output end of the adjusting cylinder (182) and fixed to the movable plate (5).

8. A pay-off mechanism as claimed in claim 7, characterized in that A boss (183) is fixed to the inner wall surface of the side vertical plate (1) located at the top position of the rectangular hole (17), an L-shaped plate (53) is fixed to the inner wall surface of the movable plate (5) and located above the boss (183) in a horizontal direction, and a distance sensor is arranged on the boss (183) and / or the L-shaped plate (53).

9. A pay-off mechanism as claimed in claim 1, characterized in that A mounting cross beam (4) is arranged between the two side vertical plates (1), a telescopic structure is arranged on the bottom side surface of the mounting cross beam (4), and a "[”-shaped fixed frame (45) is arranged on the end of the telescopic structure. The two ends of the first guide roller (80) are assembled on the two opposite inner walls of the fixed frame (45) respectively.

10. A pay-off mechanism as claimed in claim 9, characterized in that The telescopic structure comprises at least one second telescopic cylinder (41) installed on the bottom side of the mounting beam (4), the bottom side of the mounting beam (4) is further fixed with a guide sleeve (43) through a vertical plate (42), the guide sleeve (43) is provided with a movable column (44) penetratingly arranged in the guide sleeve (43), the bottom end of the movable column (44) is fixed on a fixed frame (45), and the top end is connected to the output end of the second telescopic cylinder (41).

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