Power cable telescopic dynamic balancing device

Abstract

The invention discloses a power cable telescopic dynamic balancing device which comprises an adjusting assembly and at least one frame, two oppositely-distributed balancing assemblies are arranged on the frame, and guide assemblies are arranged at the moving ends of the balancing assemblies. A cable body penetrates through the guide assembly, a reserved space for the guide assembly to move downwards is formed in the position, corresponding to the guide assembly, of the frame, the balance assembly can drive the extrusion guide assembly to move downwards and drive the cable body to bend downwards, and the bending section is an expansion reserved section of the cable body; the balance assembly comprises a shell arranged on the frame, a first spring is vertically arranged in the shell, a connecting part in contact with the top of the first spring is arranged on the shell in an up-down sliding mode, and a locking part is further arranged on the shell. According to the invention, the cable body has corresponding tension after thermal expansion, so that the cable body is prevented from being too loose to damage a surface insulating layer.

Description

Technical Field

[0001] The invention relates to the technical field of cable protection, and in particular to a power cable expansion and contraction dynamic balancing device. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Power cable is an insulated wire used to transmit electric energy. It is usually composed of multiple strands of wire and an outer protective material. Power cable will expand and contract due to temperature differences (such as different seasons or regions). If the cable contacts a fixed bracket or the cables are in contact with each other, it is easy to have adverse effects due to thermal expansion and contraction. For example, on the cable interlayer, the cable is easy to move due to thermal expansion and contraction. After displacement, the friction between the bracket or other cables will increase, thereby causing damage to the insulation layer. After the cable shrinks, it will affect the connection stability between its end and the connection point. The insulation performance of the cable is reduced and the cable is prone to increase its failure risk due to tension and pressure. The existing processing method is usually to reserve a margin section for the thermal expansion and contraction of the cable. However, the expansion and contraction of the cable is different in different seasons or at different temperatures. If the cable margin section is long and the expansion and contraction is less than the margin section, the above-mentioned margin section will easily relax at a high temperature. After relaxation, it will still contact the bracket or other cables to produce friction. Therefore, a power cable expansion and contraction dynamic balancing device is proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a power cable expansion and contraction dynamic balancing device to solve the above-mentioned shortcomings, so that the cable has a surplus section for expansion and contraction, and at the same time the cable is not easy to loosen.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a power cable expansion and contraction dynamic balancing device, comprising:

[0006] An adjusting component and at least one frame, wherein two relatively distributed balancing components are arranged on the frame, a guide component is arranged at the moving end of the balancing component, the cable body passes through the guide component, and a position of the frame corresponding to the guide component has a reserved space for the guide component to move downward, the balancing component can drive the extrusion guide component to move downward, and drive the cable body to bend downward, and the bending section is a reserved section for the expansion and contraction of the cable body;

[0007] The balancing assembly comprises a shell arranged on the frame, a first spring arranged vertically in the shell, the bottom of the first spring contacts the guide assembly, a connecting component slidably arranged on the shell and in contact with the top of the first spring, and a locking component is also arranged on the shell, the locking component is used to push the connecting component to move downward and compress the first spring;

[0008] The adjusting component can trigger the locking component to release the limiting state of the connecting component, and can also push the connecting component downward to change the elastic force applied by the first spring to the guiding component.

[0009] Furthermore, the connecting component includes a first rack that can slide up and down and is inserted into the shell, and a mounting plate is provided at the bottom of the first rack, and a side of the mounting plate away from the first rack contacts with a top of the first spring; the locking component includes a first gear that can be rotatably arranged on the shell, and the first gear is meshed with the first rack. A guide frame is also provided on the shell, and a slider that slides in the direction of the rotation axis of the first gear is provided on the guide frame, and a limit plate is provided on the side of the slider close to the first gear, and the limit plate is used to be inserted into the tooth groove of the first gear to limit the rotation of the first gear, and a second spring is transversely arranged on the guide frame, and the second spring is located between the inner wall of the guide frame and the slider;

[0010] The top of the slider has an inclined surface, and the adjustment component can contact the inclined surface downward, so that the slider drives the limiting plate to move to one side, releasing the limitation of the first gear and the first rack, and the second spring can push the moved slider to reset it.

[0011] Furthermore, the adjustment component is detachably arranged on the guide frame, and the adjustment component includes a frame body, a push rod is arranged in the frame body and can slide up and down, a plurality of lock grooves are opened on the side wall of the push rod, and a latch assembly is arranged on the side wall of the frame body, and the latch assembly can be inserted into the corresponding lock groove to limit the push rod, and the push rod can slide up and down when the latch assembly is in an unlocked state, and the push rod can move laterally after the push rod moves downward to contact with the corresponding inclined surface of the slider.

[0012] Furthermore, positioning pins are provided on both sides of the guide frame, and fixing hooks are provided on both sides of the frame body. Each fixing hook can be hooked on a corresponding positioning pin, so that the frame body is temporarily fixed on the top of the guide frame.

[0013] Furthermore, the adjustment component also includes a second rack that can slide up and down and is arranged in the frame. The frame is rotatably provided with an adjustment component. After the adjustment component is rotated, it can drive the second rack to descend to a desired height, so that the second rack pushes the first rack to descend, or blocks it directly above the first rack.

[0014] Furthermore, the adjustment component includes a second gear and a locking gear rotatably arranged in the frame body, the second gear is meshed with the second rack, and a rotating handle penetrating outside the frame body is coaxially arranged on the side of the second gear away from the locking gear. Rotating the rotating handle can drive the second gear to rotate synchronously, and the second gear has a cavity inside, and a contact piece is arranged on the side wall of the cavity corresponding to the second gear. The rotation of the second gear can drive the contact piece to rotate around the center of the second gear, and a contact platform corresponding to the contact piece is arranged on the side of the locking gear close to the second gear, and the contact platform is rotatably arranged on the second gear. The wheel is inside, the contact platform is composed of a circular sheet and a baffle arranged on the circular sheet. The frame is also provided with a locking component, and the locking component can limit the locking gear and the contact platform after contacting the locking gear rotated to a corresponding angle. The baffle can limit the contact plate moved to contact it and prevent the second gear from continuing to rotate. The locking gear is coaxially provided with an adjusting knob that penetrates outside the frame body on the side away from the second gear. When the locking gear is in an unlimited state, rotating the adjusting knob can drive the locking gear and the contact platform to rotate synchronously, and corresponding adjustment scales are provided at the corresponding adjusting knobs on the outer wall of the frame.

[0015] Furthermore, the guide assembly includes a mounting platform connected to the bottom of the first spring, a roller belt group is arranged on the mounting platform, the roller belt group includes two roller belt assemblies distributed up and down, the cable body is located between the upper and lower roller belt assemblies, and a plurality of laterally equidistantly distributed spacers are arranged on the mounting platform.

[0016] Furthermore, two relatively distributed bearing platforms are provided on the frame, and at least one groove is provided on the bearing platform for guiding the cable body to pass through, and a rotating roller is rotatably provided on the corresponding groove of the bearing platform.

[0017] The beneficial effects of the present invention are embodied in:

[0018] In the present invention, at least one frame is installed at the cable interlayer installation location, and the cable body passes through the guide assembly on the frame. The guide assembly will balance and support the cable body. The cable body has a section of expansion and contraction reserved section at the corresponding guide assembly. When the temperature is high, the cable body will become longer due to expansion, and the first spring in the balance assembly will apply a downward elastic force to the guide assembly, so that the cable body bends downward and maintains the corresponding tension; when the temperature is low, the cable body contracts, and at this time, the partially bent expansion and contraction reserved section will gradually straighten and cause the first spring to contract upward. The device can cooperate with the cable body to perform adaptive expansion and contraction, and ensure that the cable body always has the corresponding tension with moderate tightness.

[0019] In the present invention, the connection component is released from the limited state and can move up and down by moving the adjustment component downward and triggering the locking component, and then the elastic force applied by the first spring to the guide component is changed by the adjustment component. The higher the temperature, the greater the elastic force applied by the first spring to the guide component, so that the cable body can have corresponding tension after thermal expansion, so that the cable body will not damage the surface insulation layer due to excessive relaxation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of the present invention (excluding the adjustment component);

[0021] Figure 2 It is a structural schematic diagram of the guide component in the present invention;

[0022] Figure 3 It is a schematic diagram of the combination of the regulating component and the balancing component in the present invention;

[0023] Figure 4 It is a partial view of the locking component in the present invention;

[0024] Figure 5 A partial view of the adjustment component of the present invention;

[0025] Figure 6 It is a schematic diagram of temporary installation of the adjustment component in the present invention;

[0026] Figure 7 A partial cross-sectional view of the adjustment assembly of the present invention;

[0027] Figure 8 It is a partial side view of the adjustment assembly in the present invention;

[0028] Fig. 9 For the present invention Figure 7 A partial view of A shown;

[0029] Fig.10 It is an exploded schematic diagram of the adjustment component in the present invention;

[0030] Fig.11 It is a schematic diagram of the assembly of the rotating roller in the present invention.

[0031] In the figure:

[0032] 1. Frame; 2. Balance assembly; 21. Shell; 22. First spring; 23. Mounting plate; 24. First rack; 25. Locking component; 251. First gear; 252. Guide frame; 253. Slider; 254. Second spring; 255. Limiting piece; 256. Positioning pin; 3. Guide assembly; 31. Mounting platform; 32. Roller belt assembly; 33. Spacer; 4. Cable body; 5. Carrying platform; 6. Adjustment assembly; 61. Frame; 62. Push rod; 63. Locking groove; 64. Latch assembly; 65. Second rack; 66. Adjustment component; 661. Second gear; 662. Rotating handle; 663. Contact piece; 664. Contact platform; 665. Locking gear; 666. Adjustment knob; 667. Locking component; 67. Adjustment rod; 68. Fixing hook; 7. Rotating roller. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-9 The present invention discloses a dynamic balancing device for telescopic expansion of a power cable, comprising an adjusting component 6 and at least one frame 1 and a cable body 4. Two relatively distributed balancing components 2 are arranged on the frame 1. A guide component 3 is arranged at the moving end of the balancing component 2. The cable body 4 passes through the guide component 3 and the position of the frame 1 corresponding to the guide component 3 has a reserved space for the guide component 3 to move downward. The balancing component 2 can drive the extrusion guide component 3 to move downward, and drive the cable body 4 to bend downward. The bending section is a reserved section for expansion and contraction of the cable body 4. When the temperature of the cable body 4 is high, the expansion and contraction reserved section is curved and can maintain corresponding tension to prevent it from being excessively relaxed.

[0035] In one embodiment, the balancing assembly 2 includes a shell 21 mounted on the frame 1, a first spring 22 vertically arranged in the shell 21, the bottom of the first spring 22 contacts the guide assembly 3, a connecting component that can slide up and down and contacts the top of the first spring 22 is arranged on the shell 21, and a locking component 25 is also arranged on the shell 21. The locking component 25 is used to push the connecting component to move downward and squeeze the first spring 22. The adjusting assembly 6 can trigger the locking component 25 to release the limiting state of the connecting component, and can also push the connecting component downward to change the elastic force applied by the first spring 22 to the guide assembly 3.

[0036] In a specific implementation, at least one frame 1 is installed at the cable interlayer installation location, and the cable body 4 passes through the guide assembly 3 on the frame 1. The guide assembly 3 will support the cable body 4. The cable body 4 has a reserved expansion and contraction section at the corresponding guide assembly 3. When the temperature is high, the cable body 4 will become longer due to expansion, and the first spring 22 in the balance assembly 2 will apply a downward elastic force to the guide assembly 3, so that the cable body 4 bends downward and maintains the corresponding tension; when the temperature is low, the cable body 4 contracts, and at this time, the partially bent expansion and contraction reserved section will gradually straighten and cause the first spring 22 to contract upward. The device can cooperate with the cable body 4 to perform adaptive expansion and contraction, and ensure that the cable body 4 always has the corresponding tension with moderate tightness.

[0037] Furthermore, by moving the adjustment component 6 downward and triggering the locking component 25, the connecting component is released from the limited state and can move up and down, and then the elastic force applied by the first spring 22 to the guide component 3 is changed by the adjustment component 6, so that the cable body 4 can have corresponding tension after thermal expansion, so that the cable body 4 will not damage the surface insulation layer due to excessive relaxation.

[0038] In actual situations, the number of cables guided by the guide component 3 is usually one or three. In the case of three cables, they correspond to the phase line, the neutral line and the protective grounding line respectively. The guide component 3 can guide a single cable, or separate and guide multiple cables; it should also be noted that when the elastic force applied by the first spring 22 to the guide component 3 is set, the elastic force is not large enough to affect the connection stability between the end of the cable body 4 and the corresponding connection point.

[0039] In one embodiment, the connecting component includes a first rack 24 that can slide up and down and is inserted into the shell 21. A mounting plate 23 is installed at the bottom of the first rack 24, and the side of the mounting plate 23 away from the first rack 24 contacts the top of the first spring 22; the locking component 25 includes a first gear 251 that can be rotatably installed on the shell 21, and the first gear 251 is meshed with the first rack 24. A guide frame 252 is also installed on the shell 21, and a slider 253 that slides in the direction of the rotation axis of the first gear 251 is installed on the guide frame 252. A limiting plate 255 is installed on the side of the slider 253 close to the first gear 251. The limiting plate 255 is used to be inserted into the tooth groove of the first gear 251 to limit the rotation of the first gear 251. A second spring 254 is installed horizontally on the guide frame 252, and the second spring 254 is located between the inner wall of the guide frame 252 and the slider 253; the top of the slider 253 has an inclined surface.

[0040] In a specific implementation, the adjusting component 6 can contact the inclined surface of the slider 253 downward, and the slider 253 drives the limiting piece 255 to move toward the side close to the second spring 254. After the limiting piece 255 continues to move, it will leave the tooth groove of the first gear 251. At this time, the first gear 251 can rotate and the first rack 24 can move up and down. Therefore, the locking component 25 releases the limitation on the first rack 24. After the adjustment is completed, when the adjusting component 6 does not continue to contact the inclined surface of the slider 253, the second spring 254 can push the moved slider 253 to reset it, so that the limiting piece 255 is inserted into the tooth groove of the first gear 251. Since the first gear 251 and the corresponding parts of the first gear 251 have rounded corners, when the limiting piece 255 contacts the teeth of the first gear 251, it will squeeze the first gear 251 through the rounded corner to make it rotate slightly. After rotation, the limiting piece 255 corresponds to the tooth groove of the first gear 251, so it can be inserted into it.

[0041] It should be noted that, in actual situations, the more teeth the first gear 251 has, the smaller the rotation amplitude of the first gear 251 due to being squeezed by the limiting piece 255 .

[0042] In one embodiment, positioning pins 256 are installed on both sides of the guide frame 252 , and elastic fixing hooks 68 are installed on both sides of the frame body 61 .

[0043] In a specific implementation, the positioning pin 256 is rectangular in shape, and the frame body 61 can be temporarily fixed on the top of the guide frame 252 by hooking each fixing hook 68 on the corresponding positioning pin 256. This method enables the frame body 61 to be temporarily installed on the guide frame 252. When the first spring 22 is pushed downward, since the frame body 61 can remain fixed, it will not be pushed in the opposite direction by the first spring 22, which is beneficial to improving its adjustment stability.

[0044] In one embodiment, the adjustment assembly 6 is detachably arranged on the guide frame 252, and the adjustment assembly 6 includes a frame body 61, and a push rod 62 is installed in the frame body 61 so as to slide up and down. An adjustment rod 67 is installed on the side wall of the push rod 62, and a strip-shaped and vertically arranged guide groove is opened on the side wall of the frame body 61. The adjustment rod 67 passes through the guide groove, and the staff can hold the adjustment rod 67 and drive the adjustment rod 67 to move up and down. A plurality of locking grooves 63 are opened on the side wall of the push rod 62. The lock slot 63 is wedge-shaped, with its flat surface facing downward and its inclined surface facing upward. A latch assembly 64 is provided on the side wall of the frame body 61. The latch assembly 64 includes a wedge-shaped latch and an extrusion spring in contact with the wedge-shaped latch. The extrusion spring can push the wedge-shaped latch to be inserted into the corresponding lock slot 63 to limit the push rod 62. When the latch assembly 64 is in an unlocked state, the push rod 62 can slide up and down, and after the push rod 62 moves downward to contact the corresponding inclined surface of the slider 253, the slider 253 can be moved horizontally.

[0045] In a specific implementation, the latch assembly 64 can be inserted into different lock slots 63 to fix the push rod 62 at a corresponding height. The push rod 62 can continuously resist the slider 253 at a corresponding height, so that the limit plate 255 will not reset within a corresponding time, so as to facilitate the height adjustment of the first rack 24. The side of the wedge-shaped latch away from the lock slot 63 is located outside the frame 61, so it is convenient for the staff to pull it away from the lock slot 63. The above-mentioned latch assembly 64 belongs to the common knowledge in the field, so its specific structure and working principle will not be described in detail in this article.

[0046] In one embodiment, the adjustment assembly 6 further includes a second rack 65 slidably installed in the frame 61, and an adjustment component 66 is rotatably provided on the frame 61. After the adjustment component 66 rotates, it can drive the second rack 65 to descend to a desired height.

[0047] With this design, when the second rack 65 descends to the desired height, the second rack 65 can push the first rack 24 down, or block it directly above the first rack 24, so that the first rack 24 is reversely squeezed by the first spring 22 until it contacts the mounting plate 23 and then stops.

[0048] In one embodiment, the adjustment component 66 includes a second gear 661 and a locking gear 665 rotatably installed in the frame body 61. The second gear 661 is meshed with the second rack 65. A rotating handle 662 that penetrates the outside of the frame body 61 is coaxially installed on the side of the second gear 661 away from the locking gear 665. Rotating the rotating handle 662 can drive the second gear 661 to rotate synchronously. The second gear 661 has a cavity inside, and a contact piece 663 is installed on the side wall of the cavity corresponding to the second gear 661. The rotation of the second gear 661 can drive the contact piece 663 to rotate around the center of the second gear 661. A contact platform 664 corresponding to the contact piece 663 is installed on the side of the locking gear 665 close to the second gear 661. The contact platform 664 is rotatably installed in the second gear 661 at the same time. The contact platform 664 is The frame 61 is composed of a circular sheet and a blocking piece installed on the circular sheet. A locking component 667 is also provided on the frame 61. The locking component 667 cooperates with the locking gear 665, and its structure is the same as the locking component 25. The locking component 667 can limit the locking gear 665 and the abutment platform 664 after contacting the locking gear 665 rotated to a corresponding angle. The blocking piece can limit the abutment plate 663 moved to contact it and prevent the second gear 661 from continuing to rotate. An adjusting knob 666 that penetrates the outside of the frame 61 is coaxially installed on the side of the locking gear 665 away from the second gear 661. When the locking gear 665 is in an unrestricted state, rotating the adjusting knob 666 can drive the locking gear 665 and the abutment platform 664 to rotate synchronously. A corresponding adjustment scale is provided at the corresponding adjusting knob 666 on the outer wall of the frame 61.

[0049] In a specific implementation, the adjusting knob 666 is in the initial state. When the locking component 667 releases the limit on the locking gear 665, the adjusting knob 666 can be rotated in one direction or the other direction according to the indication of the adjusting scale. The angle corresponds to the required lifting height of the second rack 65. At this time, the locking gear 665 and the abutment platform 664 will also rotate to move the blocking piece to the corresponding position. After the adjusting knob 666 is rotated, the locking component 667 is operated to limit the locking gear 665. Subsequently, the rotating handle 662 can be rotated in the same direction as the locking gear 665 until the abutment plate 664 is released. 63 is blocked by the blocking piece. When the second gear 661 rotates in one direction with the rotating handle 662, the second rack 65 will descend and push the second rack 65 down. At this time, the first spring 22 is squeezed by the mounting plate 23, thereby increasing the corresponding elastic force it applies to the guide assembly 3; when the rotating handle 662 rotates in the other direction, the second rack 65 will drive the mounting plate 23 to rise, so that the first spring 22 can be extended and elongated from its top, thereby reducing the corresponding elastic force it applies to the guide assembly 3. When multiple adjustments are made, it is only necessary to adjust the abutment table 664 to the corresponding angle according to the indicated scale and then stop.

[0050] In one embodiment, the guide assembly 3 includes a mounting platform 31 connected to the bottom of the first spring 22, and a roller-belt group 32 is arranged on the mounting platform 31. The roller-belt group 32 includes two roller-belt assemblies distributed up and down. The roller-belt assembly includes two roller bodies and a transmission belt arranged on the roller bodies. The cable body 4 is located between the upper and lower roller-belt assemblies and is in contact with the transmission belt. A plurality of spacer plates 33 distributed equidistantly in the transverse direction are installed on the mounting platform 31.

[0051] With this design, when the guide assembly 3 drives the cable body 4 to move up and down, the transmission belt contacts the cable body 4, which will not cause damage to the surface of the cable body 4. When there are multiple cable bodies 4, the spacer plate 33 can separate them from each other to prevent the cable bodies 4 from contacting and rubbing against each other.

[0052] In one embodiment, two relatively distributed supporting platforms 5 are installed on the frame 1, and at least one groove is provided on the supporting platform 5 for guiding the cable body 4 to pass through. A rotating roller 7 is rotatably installed on the corresponding groove of the supporting platform 5.

[0053] In a specific implementation, each cable body 4 is located in a corresponding groove to prevent them from contacting each other, and the cable body 4 is in contact with the rotating roller 7, so it will not be damaged by friction with the supporting platform 5 during expansion and contraction adjustment.

[0054] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] In addition, "plurality" means two or more.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power cable expansion and contraction dynamic balancing device, characterized in that: include: An adjusting component (6) and at least one frame (1), wherein the frame (1) is provided with two balancing components (2) which are relatively distributed, a guide component (3) being provided at a moving end of the balancing component (2), a cable body (4) passing through the guide component (3) and a position of the frame (1) corresponding to the guide component (3) having a reserved space for the guide component (3) to move downward, the balancing component (2) being able to drive the extrusion guide component (3) to move downward, and drive the cable body (4) to bend downward, and the bending section is a reserved section for expansion and contraction of the cable body (4); The balancing assembly (2) comprises a shell (21) arranged on the frame (1), a first spring (22) vertically arranged in the shell (21), the bottom of the first spring (22) contacts the guide assembly (3), a connecting component slidably arranged on the shell (21) and in contact with the top of the first spring (22), and a locking component (25) is also arranged on the shell (21), and the locking component (25) is used to push the connecting component to move downward to squeeze the first spring (22); The adjustment component (6) can trigger the locking component (25) to release the limiting state of the connecting component, and can also push the connecting component downward to change the elastic force applied by the first spring (22) to the guide component (3).

2. The power cable expansion and contraction dynamic balancing device according to claim 1, characterized in that: The connecting component comprises a first rack (24) which is slidable up and down and is passed through the housing (21); a mounting plate (23) is provided at the bottom of the first rack (24); a side of the mounting plate (23) which is away from the first rack (24) contacts the top of the first spring (22); the locking component (25) comprises a first gear (251) which is rotatably provided on the housing (21); the first gear (251) is meshed with the first rack (24); a guide frame (252) is also provided on the housing (21); The guide frame (252) is provided with a slider (253) which slides in the direction of the rotation axis of the first gear (251); a limit plate (255) is provided on a side of the slider (253) close to the first gear (251); the limit plate (255) is used to be inserted into the tooth groove of the first gear (251) to limit the rotation of the first gear (251); a second spring (254) is transversely provided on the guide frame (252); the second spring (254) is located between the inner wall of the guide frame (252) and the slider (253); The top of the slider (253) has an inclined surface, and the adjustment component (6) can contact the inclined surface downward, so that the slider (253) drives the limiting plate (255) to move to one side, thereby releasing the limiting of the first gear (251) and the first rack (24), and the second spring (254) can push the slider (253) after moving to reset it.

3. The power cable expansion and contraction dynamic balancing device according to claim 2, characterized in that: The adjusting assembly (6) is detachably arranged on the guide frame (252), and the adjusting assembly (6) comprises a frame body (61), a push rod (62) is arranged in the frame body (61) and can slide up and down, a plurality of locking grooves (63) are provided on the side wall of the push rod (62), and a latch assembly (64) is arranged on the side wall of the frame body (61), and the latch assembly (64) can be inserted into the corresponding locking groove (63) to limit the push rod (62), and when the latch assembly (64) is in an unlocked state, the push rod (62) can slide up and down, and after the push rod (62) moves downward to contact with the corresponding inclined surface of the slider (253), it can cause the slider (253) to move horizontally.

4. The power cable expansion and contraction dynamic balancing device according to claim 3, characterized in that: Positioning pins (256) are provided on both sides of the guide frame (252), and fixing hooks (68) are provided on both sides of the frame body (61). Each fixing hook (68) can be hooked onto a corresponding positioning pin (256) so that the frame body (61) is temporarily fixed on the top of the guide frame (252).

5. The power cable expansion and contraction dynamic balancing device according to claim 3, characterized in that: The adjustment assembly (6) further comprises a second rack (65) which is slidable up and down and is arranged in the frame (61); an adjustment component (66) is rotatably arranged on the frame (61); after the adjustment component (66) rotates, it can drive the second rack (65) to descend to a desired height, so that the second rack (65) pushes the first rack (24) to descend, or blocks it directly above the first rack (24).

6. The power cable expansion and contraction dynamic balancing device according to claim 5, characterized in that: The adjusting component (66) comprises a second gear (661) and a locking gear (665) rotatably arranged in the frame body (61); the second gear (661) meshes with the second rack (65); a rotating handle (662) penetrating the outside of the frame body (61) is coaxially arranged on the side of the second gear (661) away from the locking gear (665); rotating the rotating handle (662) can drive the second gear (661) to rotate synchronously; the second gear (661) has a cavity inside; a contact piece (663) is arranged on the side wall of the cavity corresponding to the second gear (661); the rotation of the second gear (661) can drive the contact piece (663) to rotate around the center of the second gear (661); a contact platform (664) corresponding to the contact piece (663) is arranged on the side of the locking gear (665) close to the second gear (661); the contact platform (664) is rotatably arranged In the second gear (661), the abutment platform (664) is composed of a circular plate and a blocking piece arranged on the circular plate. A locking component (667) is also arranged on the frame (61). The locking component (667) can limit the locking gear (665) and the abutment platform (664) after contacting the locking gear (665) rotated to a corresponding angle. The blocking piece can limit the abutment plate (663) moved to contact with it and prevent the second gear (661) from continuing to rotate. An adjusting knob (666) penetrating the outside of the frame (61) is coaxially arranged on a side of the locking gear (665) away from the second gear (661). When the locking gear (665) is in an unrestricted state, rotating the adjusting knob (666) can drive the locking gear (665) and the abutment platform (664) to rotate synchronously. An adjusting scale corresponding to the adjusting knob (666) is arranged on the outer wall of the frame (61).

7. The power cable expansion and contraction dynamic balancing device according to claim 1, characterized in that: The guide assembly (3) comprises a mounting platform (31) connected to the bottom of the first spring (22), a roller belt group (32) is arranged on the mounting platform (31), the roller belt group (32) comprises two roller belt assemblies which are distributed up and down, the cable body (4) is located between the two roller belt assemblies, and a plurality of spacer plates (33) which are distributed equidistantly in the transverse direction are arranged on the mounting platform (31).

8. The power cable expansion and contraction dynamic balancing device according to claim 1, characterized in that: The frame (1) is provided with two relatively distributed supporting platforms (5), the supporting platform (5) is provided with at least one groove, the groove is used to guide the cable body (4) to pass through, and a rotating roller (7) is rotatably provided on the corresponding groove of the supporting platform (5).

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