A tension self-adjusting device for a cable drum

Abstract

The application discloses a kind of tension self-regulating devices of cable reel, including support and the cable pay-off structure of rotation being arranged on the support, the cable pay-off structure includes shaft pole;Further include: movable plate, rotationally connected to the support.This scheme is connected by setting clamping structure with the movable plate of the shaft pole of one end of pay-off reel, realize when worker pulls cable and drives pay-off reel rotation, shaft pole drives movable plate rotation, when movable plate rotates by transmission structure and drives rotary body reverse rotation, utilize centrifugal force to make the sliding block in the inner groove of rotary body and the speed limiting protrusion in the inner cavity of cover body occur and resist, and the faster pay-off reel speed, the greater tension, to realize the deceleration of pay-off reel, keep cable tension, since sliding block is slidably arranged in inner groove, when sliding block and speed limiting protrusion collide, it will be pushed back into inner groove, will not directly collide and cause sliding block abrasion or fracture, improve service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable pay-off device, in particular to a tension self-adjusting device of cable pay-off reel. BACKGROUND

[0002] In the cable laying operation, the cable pay-off rack is usually used for pay-off, but the general cable reel usually adopts passive tension pay-off mode in the pay-off process, the rotation of the pay-off reel is driven by the tension at the rear end to pay off the cable, when the pay-off speed of the reel is too fast, the cable tension adjustment is unbalanced due to the inability to adjust the tension, and the cable is often tangled, which seriously affects the pay-off efficiency.

[0003] In order to solve the above technical problems, the Chinese patent with the authorization announcement number CN206969894U discloses an automatic tension adjusting device of tension pay-off reel, which comprises a vertical adjusting tension screw, a vertical friction block arranged outside the adjusting tension screw, a top end of the friction block in contact with a friction disc, a spring block arranged at the bottom of the friction block, a spring connected below the spring block, a reducer connected at the bottom end of the spring, and a motor connected with the reducer.

[0004] The principle is that the up and down positions of the vertical adjusting tension screw are controlled by the motor switch, the adjusting tension screw drives the external friction block to move upward or downward, the friction block is subjected to the tension of the spring to realize the force buffering and the reset of the friction block, and the size of the friction force between the friction block and the friction disc determines the rotation speed of the friction disc, thereby realizing the adjustment of the tension.

[0005] However, the existing technology has the following problems: since the friction block is always in contact with the friction disc during the rotation of the friction disc, the surface of the friction block is worn and consumed with the increase of the use time, which finally leads to the decrease of the rotation speed limiting effect on the friction disc, and the service life of the friction block is short, so that the new friction block needs to be replaced periodically, which is troublesome in use. SUMMARY

[0006] The present application aims to provide a tension self-adjusting device of cable pay-off reel to solve the technical problem that the tension adjusting device of the cable pay-off reel in the current market is adjusted by the friction block to adjust the rotation speed of the friction disc, which leads to the easy wear and consumption of the surface of the friction block, and the structure has a short service life.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a tension self-adjusting device of cable pay-off reel, comprising a support and a cable pay-off structure rotating on the support, the cable pay-off structure comprising a shaft;

[0008] Further comprising:

[0009] a movable plate rotatably connected to the support;

[0010] a cover fixedly arranged on the support;

[0011] a rotating body rotatably arranged in a cavity of the cover;

[0012] a sliding block arranged in a slot of the rotating body, and the cavity is arranged with speed limiting protrusions matched with the sliding block about the central axis of the rotating body;

[0013] a spring for keeping the sliding block in contact with the speed limiting protrusions;

[0014] a clamping structure arranged on the surface of the movable plate for clamping the shaft, and the shaft penetrates through a through slot arranged about the central axis of the movable plate, the rotating body and the cover;

[0015] a transmission structure for synchronously driving the rotating body to rotate reversely when the shaft drives the movable plate to rotate forward, so that the sliding block intermittently contacts with the speed limiting protrusions to realize the speed reduction of the rotating body.

[0016] According to the preferred technical scheme of the present application, the support comprises at least two oppositely arranged support bodies, the support body comprises a support rod and a bearing frame arranged on the upper end of the support rod for placing the shaft, and the bottom of the support rod is connected with a base.

[0017] According to the preferred technical scheme of the present application, the cable pay-off structure comprises a pay-off disc directly connected with the shaft, and the pay-off disc is used for winding the cable.

[0018] According to the preferred technical scheme of the present application, the spring is fixed at one end of the slot, and the other end of the spring is in contact with the sliding block.

[0019] According to the preferred technical scheme of the present application, the surface of the sliding block is rotatably arranged with a roller, and the roller is in contact with the speed limiting protrusions.

[0020] According to the preferred technical scheme of the present application, the clamping structure comprises at least two clamping portions, and the clamping portion comprises:

[0021] a fixed plate arranged on one side of the movable plate;

[0022] an electric push rod, the bottom of which is connected with the fixed plate;

[0023] a clamping plate, one side of which is arranged with an arc-shaped slot matched with the shaft, and the other side of the clamping plate is connected with the output end of the electric push rod.

[0024] As a preferred technical scheme of the present application, the support rod is connected with a support ring on one side, and a limiting protrusion is arranged on the inner edge of the support ring and cooperates with a limiting groove arranged on the outer edge of the movable plate.

[0025] As a preferred technical scheme of the present application, the transmission structure comprises:

[0026] an inner rack arranged on one side of the movable plate;

[0027] a transmission gear rotatably arranged on one side of the support rod and arranged in the inner rack and engaged with the inner rack;

[0028] an outer rack arranged on the outer edge of the rotating body and engaged with the transmission gear.

[0029] As a preferred technical scheme of the present application, the tension self-adjusting device of the cable reel further comprises:

[0030] a mounting frame arranged on the support rod;

[0031] a sliding frame body, a guide hole for the cable to enter and exit being arranged on the surface of the sliding frame body;

[0032] a motor connected to the mounting frame;

[0033] a lead screw connected to the output shaft of the motor and cooperated with a lead screw groove arranged on the surface of the sliding frame body;

[0034] a guide rod, one end of the guide rod being fixed to the mounting frame and cooperated with a guide groove arranged on the surface of the sliding frame body.

[0035] As a preferred technical scheme of the present application, the through groove comprises:

[0036] a first through groove arranged in the direction of the central axis of the movable plate;

[0037] a second through groove arranged in the direction of the central axis of the rotating body, and a friction plate arranged on the inner wall of the second through groove and in frictional contact with the shaft;

[0038] a third through groove arranged in the direction of the central axis of the cover, and the central axes of the first through groove, the second through groove and the third through groove coincide.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] The application realizes the rotation of the shaft rod and the movable plate by workers pulling the cable to drive the pay-off reel to rotate, the reverse rotation of the rotating body by the transmission structure when the movable plate rotates, the friction between the sliding block in the rotating body and the speed limiting protrusion in the inner cavity of the cover by centrifugal force, and the greater tension with the faster rotation speed of the pay-off reel, so as to realize the speed reduction of the pay-off reel and keep the cable tension. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a perspective structural schematic diagram of the application;

[0042] Figure 2 It is a perspective structural schematic diagram of the application;

[0043] Figure 3 It is a perspective structural schematic diagram of the application;

[0044] Figure 4 It is a perspective structural schematic diagram of the application;

[0045] Figure 5 It is a perspective structural schematic diagram of the application;

[0046] Figure 6 It is a perspective structural schematic diagram of the application;

[0047] Figure 7 It is a perspective structural schematic diagram of the application; Figure 6 It is a perspective structural schematic diagram of the application;

[0048] Figure 8 It is a perspective structural schematic diagram of the application;

[0049] Figure 9 It is a perspective structural schematic diagram of the application;

[0050] Figure 10 It is a perspective structural schematic diagram of the application;

[0051] Figure 11 It is a perspective structural schematic diagram of the application.

[0052] In the figure: 1, support rod; 2, base; 3, bearing frame; 4, pay-off reel; 5, shaft; 6, cable; 7, support ring; 8, movable plate; 9, limiting protrusion; 10, limiting groove; 11, inner rack; 12, transmission gear; 13, cover body; 14, rotating body; 15, outer rack; 16, first through groove; 17, second through groove; 18, third through groove; 19, friction plate; 20, fixed plate; 21, electric push rod; 22, clamping plate; 23, inner groove; 24, sliding block; 25, spring; 26, roller; 27, speed limiting protrusion; 28, mounting frame; 29, motor; 30, screw rod; 31, sliding frame body; 32, screw rod groove; 33, guide rod; 34, guide groove; 35, guide hole; 36, pulley; 37, threaded groove; 38, threaded rod; 39, thorn end; 40, handle. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0054] Please refer to Figures 1-11 The present application provides a technical solution: a tension self-adjusting device of a cable pay-off reel, comprising a support and a cable pay-off structure rotatably arranged on the support, and the cable pay-off structure comprises a shaft 5. Specifically, the support comprises at least two oppositely arranged support bodies, each support body comprising a support rod 1 and a bearing frame 3 arranged at the upper end of the support rod 1 for placing the shaft 5, and the bottom of the support rod 1 is connected with a base 2. Specifically, the cable pay-off structure comprises a pay-off reel 4 directly connected with the shaft 5, and the pay-off reel 4 is used for winding the cable 6.

[0055] The above technical solution can be used to place the pay-off reel 4. By arranging the bearing frame 3, the bearing frame 3 can be used to support the shaft 5 on both sides of the pay-off reel 4. The base 2 can increase the contact area of the support rod 1 with the ground, so as to avoid the support rod 1 from falling down and improve the stability of the structure.

[0056] Further, as shown in Figure 1 and Figure 11 , the support body further comprises: a plurality of pulleys 36 arranged at the bottom of the base 2; a threaded rod 38 arranged in a threaded groove 37 formed in the base 2; a thorn end 39 arranged at the bottom end of the threaded rod 38 for insertion into the ground for fixation; and a handle 40 arranged at the top end of the threaded rod 38.

[0057] The above technical solution can facilitate the transportation of the device. After the support rod 1 is transported to the designated position by pushing the pulleys 36 at the bottom of the base 2, the thorn end 39 can be inserted into the ground for fixation, and the handle 40 can be used to rotate the threaded rod 38 to adjust the height of the support rod 1. Figure 1As shown, the support rod 1 is relatively placed, the rotating handle 40 drives the threaded rod 38 to rotate, the threaded rod 38 drives the sharp end 39 to move downward, until the sharp end 39 is inserted into the ground, the fixing of the base 2 is completed, and it is very convenient.

[0058] As shown in Figure 3 and Figure 4 , the tension self-adjusting device of the cable drum further comprises a movable plate 8 which is rotationally connected to the support; specifically, the support rod 1 is connected with a support ring 7 on one side, and the inner edge of the support ring 7 is provided with a limiting protrusion 9 which cooperates with a limiting groove 10 opened on the outer edge of the movable plate 8.

[0059] As shown in Figure 5 and Figure 9 , the cover 13 is fixedly arranged on the support; the rotating body 14 is rotationally arranged in the inner cavity of the cover 13.

[0060] As shown in Figure 3 , the tension self-adjusting device of the cable drum further comprises a clamping structure arranged on the surface of the movable plate 8 for clamping the shaft 5, and the shaft 5 penetrates through the through slot opened on the central axis of the movable plate 8, the rotating body 14 and the cover 13; wherein the through slot comprises: a first through slot 16 opened in the central axis direction of the movable plate 8; a second through slot 17 opened in the central axis direction of the rotating body 14; and a third through slot 18 opened in the central axis direction of the cover 13, and the central axes of the first through slot 16, the second through slot 17 and the third through slot 18 coincide; specifically, the clamping structure comprises at least two clamping parts, and the clamping part comprises: a fixed plate 20 arranged on one side of the movable plate 8; an electric push rod 21 connected with the fixed plate 20 at the bottom; and a clamping plate 22 which is provided with an arc-shaped slot matched with the shaft 5 on one side, and the other side of the clamping plate 22 is connected with the output end of the electric push rod 21.

[0061] The above technical scheme can fixedly connect the movable plate 8 with the shaft 5, ensure that the shaft 5 can drive the movable plate 8 to rotate synchronously when rotating, align the one end of the shaft 5 of the drum 4 with the first through slot 16 of the movable plate 8, insert the shaft 5 through the second through slot 17 of the rotating body 14, and make the other end of the shaft 5 placed on the bearing frame 3 of the other support rod 1, start the two electric push rods 21 to drive the respective clamping plates 22 to move, and the two clamping plates 22 clamp and fix the shaft 5, thereby completing clamping.

[0062] As shown in Figure 6 and Figure 7As shown in the drawings, the tension self-adjusting device of the cable pay-off reel further comprises a sliding block 24 arranged in an inner groove 23 formed in the rotating body 14, and the inner cavity is arranged with a speed limiting protrusion 27 matched with the sliding block 24 about the central axis of the rotating body 14; a resilient member for keeping the sliding block 24 in contact with the speed limiting protrusion 27; specifically, the resilient member comprises a spring 25 fixed at one end of the inner groove 23, and the other end of the spring 25 is in abutment with the sliding block 24;

[0063] As shown in the drawings, Figure 4 and Figure 5 a transmission structure for synchronously driving the rotating body 14 to rotate reversely when the shaft 5 drives the movable plate 8 to rotate forward, so that the sliding block 24 intermittently collides with the speed limiting protrusion 27 to realize the speed reduction of the rotating body 14; specifically, the transmission structure comprises: an inner gear rack 11 arranged on one side of the movable plate 8; a transmission gear 12 rotatably arranged on one side of the support rod 1, and the transmission gear 12 is arranged inside the inner gear rack 11 and engaged with the inner gear rack 11; and an outer gear rack 15 arranged on the outer edge of the rotating body 14 and engaged with the transmission gear 12.

[0064] The above technical scheme can limit the rotation speed of the pay-off reel 4 during rotation, and ensure that the cable 6 can maintain a certain tension without loosening. When the cable 6 is pulled, the cable 6 drives the pay-off reel 4 to rotate, the pay-off reel 4 drives the shaft 5 to rotate, the shaft 5 drives the movable plate 8 to rotate, the movable plate 8 drives the inner gear rack 11 on the surface thereof to rotate, the inner gear rack 11 drives the transmission gear 12 to rotate, the transmission gear 12 drives the outer gear rack 15 to engage, so that the rotating body 14 rotates, and the rotating direction of the rotating body 14 is opposite to the rotating direction of the movable plate 8. When the rotating body 14 rotates, the sliding block 24 in the inner groove 23 will generate a centrifugal force. The faster the rotation speed is, the greater the centrifugal force acting on the sliding block 24 will be, and the greater the length of the sliding block 24 extending out of the inner groove 23 will be. The speed limiting protrusion 27 on the outside of the sliding block 24 and the inside of the cover 13 is in contact. Therefore, when the sliding block 24 collides with the speed limiting protrusion 27, the rotation speed of the rotating body 14 will be limited to a lower speed. Since the sliding block 24 is slidably arranged in the inner groove 23, when the sliding block 24 collides with the speed limiting protrusion 27, the sliding block 24 will be pushed back into the inner groove 23 and will not directly collide to cause abrasion or breakage of the sliding block 24, thereby prolonging the service life. Then the spring 25 can drive the sliding block 24 to reset, so that the sliding block 24 continuously extends and retracts. The faster the rotation speed of the pay-off reel 4 is, the more obvious the speed reduction will be. As a possible case, in order to further improve the speed reduction effect, a friction plate 19 in frictional contact with the shaft 5 can be arranged on the inner wall of the second through groove 17.

[0065] Further, as shown in the drawings, Figure 7 the surface of the sliding block 24 is rotatably provided with a roller 26, and the roller 26 is in contact with the speed limiting protrusion 27;

[0066] Adopt above technical scheme can reduce the wear and tear between sliding block 24 and speed limiting protrusion 27, improve the service life, in the side of sliding block 24 and speed limiting protrusion 27 contact rotary connection roller 26, specifically, when speed limiting protrusion 27 presses roller 26, roller 26 will drive sliding block 24 retract in the inner groove 23, when roller 26 leaves speed limiting protrusion 27, under the elastic action of spring 25, sliding block 24 resets quickly.

[0067] As Figure 1 And Figure 10 The tension self-adjusting device of the cable pay-off reel further comprises: a mounting frame 28 arranged on the support rod 1; a sliding frame body 31, the surface of which is provided with a guide hole 35 for the cable 6 to enter and exit; a motor 29 connected to the mounting frame 28; a lead screw 30 connected to the output shaft of the motor 29, and the lead screw 30 cooperates with a lead screw groove 32 arranged on the surface of the sliding frame body 31; a guide rod 33, one end of which is fixed to the mounting frame 28, and the guide rod 33 cooperates with a guide groove 34 arranged on the surface of the sliding frame body 31.

[0068] The above technical scheme can achieve uniform pay-off, during the pay-off process, the motor 29 drives the lead screw 30 to rotate forward and backward, the lead screw 30 drives the sliding frame body 31 to move transversely along the guide rod 33, and the pay-off reel 4 uniformly pays off the cable 6.

[0069] Working principle: in use, after the pulley 36 at the bottom of the base 2 transports the support rod 1 to the designated position, as Figure 1 Indicated, the support rod 1 is placed relatively, the threaded rod 38 is rotated by rotating the handle 40, the sharp end 39 is lowered by the threaded rod 38, until the sharp end 39 is inserted into the ground, the fixing of the base 2 is completed, one end of the shaft 5 of the pay-off reel 4 is inserted into the first through groove 16 of the movable plate 8, the shaft 5 passes through the second through groove 17 of the rotating body 14, the shaft 5 passes out of the third through groove 18 of the cover body 13, the other end of the shaft 5 is placed on the bearing frame 3 of the other support rod 1, the two electric push rods 21 are started to drive the respective clamping plates 22 to move, the two clamping plates 22 clamp and fix the shaft 5, then a section of the cable 6 is pulled out and passes through the guide hole 35 on the surface of the sliding frame body 31, the assembly is completed.

[0070] When the cable 6 is pulled, the cable 6 drives the reel 4 to rotate, the reel 4 drives the shaft 5 to rotate, the shaft 5 drives the movable plate 8 to rotate, the movable plate 8 drives the inner rack 11 on the surface thereof to rotate, the inner rack 11 drives the transmission gear 12 to rotate, the transmission gear 12 drives the outer rack 15 to mesh, so that the rotating body 14 rotates, and the rotating direction of the rotating body 14 is opposite to the rotating direction of the movable plate 8, when the rotating body 14 rotates, the sliding block 24 in the inner groove 23 will generate centrifugal force, when the rotating speed is faster, the centrifugal force borne by the sliding block 24 is larger, and the length of the sliding block 24 extending out of the inner groove 23 is larger, and the outer part of the sliding block 24 contacts the speed limiting protrusion 27 in the inner part of the cover body 13, therefore, when the sliding block 24 collides with the speed limiting protrusion 27, the rotating speed of the rotating body 14 is limited to a lower speed, the faster the rotating speed of the reel 4 is, the more obvious the speed reduction is, as a possible case, in order to reduce the abrasion generated by long-term friction between the sliding block 24 and the speed limiting protrusion 27, the speed limiting protrusion 27 can be arranged as a surface cylindrical protrusion, and the rolling block 26 is rotationally connected to the side, where the sliding block 24 contacts the speed limiting protrusion 27, in detail, when the speed limiting protrusion 27 presses against the rolling block 26, the rolling block 26 will drive the sliding block 24 to retract into the inner groove 23, when the rolling block 26 is away from the speed limiting protrusion 27, the sliding block 24 is quickly reset under the elastic action of the spring 25, and simultaneously, since the second through groove 17 of the rotating body 14 is provided with the friction sheet 19, the rotating body 14 can drive the friction sheet 19 to frictionally slow down the shaft 5 when the rotating body 14 rotates, so that the reel 4 always maintains a certain tensioning force;

[0071] Meanwhile, since the sliding frame body 31 is arranged, in the process of paying out, the motor 29 drives the screw rod 30 to rotate forward and reversely, the screw rod 30 drives the sliding frame body 31 to reciprocate transversely along the guide rod 33, and the reel 4 uniformly pays out the cable 6.

[0072] Therefore, a series of work is completed, and the content not described in detail in the specification belongs to the prior art known by the person skilled in the art.

[0073] It is apparent for the person skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A tension self-adjusting device for a cable reel, comprising a bracket and a cable reel structure rotatably mounted on the bracket, wherein the cable reel structure comprises a shaft (5); Its features are, Also includes: Movable plate (8), which is rotatably connected to the bracket; The cover (13) is fixedly mounted on the bracket; A rotating body (14) is rotatably disposed in the inner cavity of the cover (13); A sliding block (24) is provided in an inner groove (23) opened in the rotating body (14), and the inner cavity is provided with speed limiting protrusions (27) that cooperate with the sliding block (24) about the central axis of the rotating body (14); An elastic element is used to keep the sliding block (24) in contact with the speed limiting protrusion (27); A clamping structure is provided on the surface of the movable plate (8) for clamping the shaft (5), and the shaft (5) passes through a through slot opened on the central axis of the movable plate (8), the rotating body (14) and the cover (13); The transmission structure is used to simultaneously drive the rotating body (14) to rotate in the opposite direction when the shaft (5) drives the movable plate (8) to rotate in the forward direction, so that the sliding block (24) and the speed limiting protrusion (27) intermittently contact each other to reduce the speed of the rotating body (14).

2. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The bracket includes at least two opposing support bodies, each support body including a support rod (1) and a bearing bracket (3) disposed on the upper end of the support rod (1) for placing the shaft (5), and a base (2) is connected to the bottom of the support rod (1).

3. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The cable laying structure includes a laying reel (4) directly connected to the shaft (5), which is used to wind the cable (6).

4. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The elastic element includes a spring (25) with one end fixed to the inner groove (23), and the other end of the spring (25) abuts against the sliding block (24).

5. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The surface of the sliding block (24) is provided with rollers (26) that rotate and contact the speed limiting protrusion (27).

6. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The clamping structure includes at least two clamping portions, each clamping portion comprising: A fixed plate (20) is provided on one side of the movable plate (8); An electric actuator (21) is connected at its bottom to the fixed plate (20); The clamping plate (22) has an arc-shaped groove on one side that matches the shaft (5), and the other side of the clamping plate (22) is connected to the output end of the electric actuator (21).

7. The tension self-adjusting device for the cable reel according to claim 2, characterized in that, The support rod (1) is connected to a support ring (7) on one side, and the inner edge of the support ring (7) is provided with a limiting protrusion (9), and the limiting protrusion (9) cooperates with the limiting groove (10) opened on the outer edge of the movable plate (8).

8. The tension self-adjusting device for the cable reel according to claim 7, characterized in that, The transmission structure includes: An internal rack (11) is provided on one side of the movable plate (8); A transmission gear (12) is rotatably mounted on one side of the support rod (1), and the transmission gear (12) is tangentially arranged and meshes with the internal rack (11); An external rack (15) is disposed on the outer edge of the rotating body (14) and meshes with the transmission gear (12).

9. The tension self-adjusting device for the cable reel according to claim 2, characterized in that, The tension self-adjusting device of the cable reel also includes: Mounting bracket (28), which is provided on the support rod (1); The sliding frame (31) has a guide hole (35) on its surface for the cable (6) to enter and exit; Motor (29), which is connected to the mounting bracket (28); A lead screw (30) is connected to the output shaft of the motor (29), and the lead screw (30) is engaged with a lead screw groove (32) formed on the surface of the sliding frame (31); A guide rod (33) is fixed at one end to the mounting bracket (28), and the guide rod (33) cooperates with the guide groove (34) formed on the surface of the sliding frame (31).

10. The tension self-adjusting device for the cable reel according to claim 1, characterized in that, The through slot includes: The first through slot (16) is opened in the direction of the central axis of the movable plate (8); The second through groove (17) is opened in the direction of the central axis of the rotating body (14), and the inner wall of the second through groove (17) is provided with a friction plate (19) that rubs against the shaft (5); The third through groove (18) is opened in the direction of the central axis of the cover (13), and the central axes of the first through groove (16), the second through groove (17) and the third through groove (18) coincide.

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