Novel frequency conversion cable for 10kV medium-voltage coal mine frequency conversion device

Abstract

The invention discloses a novel 10kV medium-voltage coal mine frequency conversion device frequency conversion cable, and relates to the technical field of frequency conversion cables, the novel 10kV medium-voltage coal mine frequency conversion device frequency conversion cable comprises a cable main body, the cable main body comprises an outer sheath, the inner wall of the outer sheath is fixedly sleeved with an aluminum-plastic tape copper wire braided shielding layer, and the aluminum-plastic tape copper wire braided shielding layer is internally sleeved with a plurality of groups of insulation shielding layers. And the inner walls of the plurality of groups of insulation shielding layers are respectively and fixedly sleeved with a group of power wire core insulation layers. According to the cable, the inner sheath is arranged and wraps the insulation shielding layers and the ground wire core conductors, so that friction between the ground wire core conductors and the insulation shielding layers and the aluminum-plastic tape copper wire braided shielding layer is avoided, and the fillers are arranged among the multiple sets of insulation shielding layers, so that mutual abrasion among the multiple sets of insulation shielding layers is avoided; the durability of the whole variable frequency cable is improved, the integrity of the whole variable frequency cable is stronger, and the tensile capacity of the variable frequency cable is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency conversion cables, in particular to a novel frequency conversion cable for a 10kV medium-voltage coal mine frequency conversion device. Background Art

[0002] With the increase of industrial electricity load and the continuous improvement of the degree of automation of large industrial and mining enterprises, low-carbon environmental protection, energy conservation and consumption reduction have become the main themes today. High-power frequency converters, frequency converter motors and various precision instruments are used extensively. The main circuit power cables connecting the frequency converters or frequency converter motors generate square waves and high-order harmonics in the process of transmitting electric energy. Therefore, frequency converter cables are used in coal mine frequency converter devices to avoid affecting the normal operation of other precision instruments.

[0003] An existing patent (publication number: CN203103001U) discloses a medium voltage (8.7 / 10kV) variable frequency power cable, which includes three conductors. The three conductors are multiple copper wires twisted and compressed into a circular compressed copper conductor. The three conductors are sequentially coated with a conductor shielding layer, a cross-linked polyethylene insulation layer, an insulation shielding layer, a metal shielding layer, and an isolation layer. The cross-section of the three insulated wire cores after being coated with the isolation layer is arranged in a herringbone shape to form a cable core. The cable core is coated with a protective layer. The protective layer is sequentially provided with an electrostatic shielding layer, a low-smoke halogen-free flame-retardant inner sheath, an armor layer composed of galvanized steel wire braid, and a low-smoke halogen-free flame-retardant outer sheath from the inside to the outside. Through the special structural design of the protective layer, it effectively solves the problem of square waves and high-order harmonics generated by the main circuit power cable of a medium voltage (8.7 / 10kV) variable frequency motor or inverter when transmitting electric energy.

[0004] However, the above technical solution still has certain defects. A galvanized steel wire wrapped armor layer is arranged between the low-smoke halogen-free flame retardant outer sheath layer and the low-smoke halogen-free flame retardant inner sheath layer, and an isolation layer is arranged inside the electrostatic screen, but no filler is arranged between the low-smoke halogen-free flame retardant outer sheath layer and the low-smoke halogen-free flame retardant inner sheath layer. As a result, when the cable is subjected to external forces such as pulling, the galvanized steel wire wrapped armor layer will rub between the low-smoke halogen-free flame retardant outer sheath layer and the low-smoke halogen-free flame retardant inner sheath layer, resulting in wear of the low-smoke halogen-free flame retardant outer sheath layer and the low-smoke halogen-free flame retardant inner sheath layer. Similarly, wear will also occur between the isolation layer and the electrostatic shielding layer. For this reason, a new type of 10kV medium-voltage frequency conversion cable for coal mine frequency conversion device is proposed. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a new type of 10kV medium voltage frequency conversion cable for coal mine frequency conversion device to solve the technical problem of easy wear between the low smoke halogen-free flame retardant outer sheath layer and the low smoke halogen-free flame retardant inner sheath layer raised in the above background.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A novel 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device, comprising a cable body, the cable body comprising an outer sheath, the inner wall of the outer sheath is fixedly sleeved with an aluminum-plastic tape copper wire braided shielding layer, the inner wall of the aluminum-plastic tape copper wire braided shielding layer is sleeved with multiple groups of insulating shielding layers, the inner walls of the multiple groups of insulating shielding layers are respectively fixedly sleeved with a group of power core insulation layers, the inner wall of the power core insulation layer is fixedly sleeved with a conductor shielding layer, the inner wall of the conductor shielding layer is fixedly sleeved with a power core body, the inner wall of the aluminum-plastic tape copper wire braided shielding layer is sleeved with multiple groups of ground core conductors, the inner wall of the ground core conductor is fixedly sleeved with a monitoring core insulation layer, the inner wall of the monitoring core insulation layer is fixedly sleeved with a monitoring core conductor, and multiple groups of ground core conductors are surrounded by the outside of the multiple groups of insulating shielding layers.

[0007] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, fillers are provided between multiple groups of the insulating shielding layers and multiple groups of ground core conductors, and inner sheaths are provided between the aluminum-plastic tape copper wire braided shielding layer and multiple groups of insulating shielding layers.

[0008] As a preferred technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, a connecting assembly is provided at the end of the cable body, and the connecting assembly includes a first fixed sleeve, the first fixed sleeve is fixedly connected to one end of the outer sheath, the outer wall of the first fixed sleeve is rotatably connected to a threaded sleeve, the inner wall of the threaded sleeve is threadedly connected to a second fixed sleeve, and the inner wall of the second fixed sleeve is provided with another set of outer sheaths.

[0009] As an optimal technical solution for a novel 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, one end of the insulating shielding layer is fixedly sleeved with a first connecting copper tube, and the end of the ground core conductor is fixedly sleeved with a second connecting copper tube.

[0010] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, the side walls of the first fixed sleeve and the second fixed sleeve are respectively fixedly connected with a group of sliders, the outer wall sliding sleeves of the two groups of sliders are provided with fixed plates, the side walls of the fixed plates are slidably connected with side plates, and the inner walls of the side plates are slidably connected with multiple groups of oblique blocks.

[0011] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, the side walls of multiple groups of the inclined blocks are respectively fixedly connected to one end of a support spring, and the other end of the support spring is fixedly connected to the inner wall of the side plate.

[0012] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, the inner wall of the fixed plate is rotatably connected to a bidirectional threaded rod extending to the outside of the fixed plate, and the outer wall of the bidirectional threaded rod is threadedly connected to two groups of push blocks, and the side walls of the two groups of push blocks are respectively hinged to a group of top plates, and the ends of the two groups of top plates are hinged to the side walls of the side plates.

[0013] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device of the present invention, the bidirectional threaded rod is fixedly connected to a hexagonal nut at one end outside the fixed plate, and the thread directions of the bidirectional threaded rod are opposite at the contact positions with the two sets of push blocks.

[0014] As an optimal technical solution for a new type of 10kV medium-voltage frequency conversion cable for a coal mine frequency conversion device according to the present invention, a group of buffer mounting components are respectively provided at the top and bottom ends of the fixed plate, and the buffer mounting components include a slide groove, which is opened on the side wall of the fixed plate, and the inner wall of the slide groove is slidably connected with two groups of fixed blocks, and the inner wall of the fixed block is slidably connected with a head extending to the inside of the slide groove, and the inner wall of the slide groove is provided with multiple groups of grooves matching the head, and one end of the head located inside the fixed block is fixedly connected to one end of a reset spring, and the other end of the reset spring is fixedly connected to the inner wall of the fixed block, and the side wall of the fixed block is provided with a bolt hole.

[0015] In summary, the present invention mainly has the following beneficial effects:

[0016] 1. The present invention provides an inner sheath so that the inner sheath wraps around the outside of the insulating shielding layer and the ground core conductor, thereby preventing the ground core conductor and the insulating shielding layer from rubbing against the aluminum-plastic tape and copper wire braided shielding layer. Fillers are provided between multiple groups of insulating shielding layers to prevent the multiple groups of insulating shielding layers from wearing each other, thereby improving the durability of the entire frequency conversion cable, making the entire frequency conversion cable more integrated, and improving the tensile strength of the frequency conversion cable;

[0017] 2. The present invention allows the two sets of cable bodies to be quickly connected together by threading the threaded sleeve on one set of cable bodies onto the second fixing sleeve on the other set of cable bodies. The two sets of sliders are then fixed by a fixing plate, thereby making the connection between the two sets of cable bodies less likely to bend, thereby preventing the connection from breaking after the two sets of cable bodies are connected together.

[0018] 3. The present invention uses bolts to fix the fixing block on the equipment or the wall, so that the cable body is fixed and will not be scattered on the ground at will. When the cable body is pulled, the fixing block slides on the fixing plate, so that the top head is continuously pushed, thereby consuming and buffering the pulling force, preventing the cable body from breaking when it is accidentally pulled. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the cable body of the present invention;

[0021] Figure 3 It is a schematic diagram of the rear cross-sectional structure of the fixing plate of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the connection between two sets of cable bodies of the present invention;

[0023] Figure 5 This is a schematic diagram of the front cross-sectional structure of the fixing plate of the present invention;

[0024] Figure 6 It is a side structural schematic diagram of the present invention;

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the fixing block of the present invention.

[0026] In the figure: 1. Cable body; 2. Connector assembly; 3. Buffer mounting assembly;

[0027] 101. Outer sheath; 102. Aluminum-plastic tape and copper wire braided shield; 103. Inner sheath; 104. Insulation shield; 105. Power line core insulation; 106. Conductor shield; 107. Power line core body; 108. Ground line core conductor; 109. Monitoring line core insulation; 110. Monitoring line core conductor; 111. Filler.

[0028] 201, first fixing sleeve; 202, second fixing sleeve; 203, threaded sleeve; 204, first connecting copper tube; 205, second connecting copper tube; 206, sliding block; 207, fixing plate; 208, side plate; 209, inclined block; 210, supporting spring; 211, bidirectional threaded rod; 212, pushing block; 213, top plate;

[0029] 301, slide groove; 302, fixing block; 303, head; 304, groove; 305, return spring; 306, bolt hole. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0031] The following describes an embodiment of the present invention based on its overall structure.

[0032] A new type of 10kV medium voltage frequency conversion cable for coal mine frequency conversion device, such as Figures 1 to 7 As shown, the cable comprises a main body 1, the main body 1 comprises an outer sheath 101, the inner wall of the outer sheath 101 is fixedly provided with an aluminum-plastic tape copper wire braided shielding layer 102, the inner wall of the aluminum-plastic tape copper wire braided shielding layer 102 is provided with multiple groups of insulating shielding layers 104, the inner walls of the multiple groups of insulating shielding layers 104 are respectively fixedly provided with a group of power core insulating layers 105, the inner wall of the power core insulating layer 105 is fixedly provided with a conductor shielding layer 106, the inner wall of the conductor shielding layer 106 is fixedly provided with a power core main body 107, the aluminum-plastic tape copper wire braided shielding layer 102 is provided with multiple groups of insulating shielding layers 104, the inner walls of the multiple groups of insulating shielding layers 104 are respectively fixedly provided with a group of power core insulating layers 105, the inner wall of the power core insulating layer 105 is fixedly provided with a conductor shielding layer 106, the inner wall of the conductor shielding layer 106 is fixedly provided with a power core main body 107, the aluminum-plastic tape copper wire braided shielding layer 102 is provided with multiple groups of insulating shielding layers 104, the inner wall of the multiple groups of insulating shielding layers 104 is ... The inner wall of the shielding layer 102 is provided with multiple groups of ground core conductors 108, the inner wall of the ground core conductor 108 is fixedly provided with a monitoring core insulation layer 109, the inner wall of the monitoring core insulation layer 109 is fixedly provided with a monitoring core conductor 110, the multiple groups of ground core conductors 108 are surrounded by the outside of the multiple groups of insulating shielding layers 104, fillers 111 are provided between the multiple groups of insulating shielding layers 104 and the multiple groups of ground core conductors 108, and an inner sheath 103 is provided between the aluminum-plastic tape copper wire braided shielding layer 102 and the multiple groups of insulating shielding layers 104.

[0033] The outer sheath 101 provides overall protection for the entire cable body 1 to prevent internal materials from being scratched. The aluminum-plastic tape and copper wire braided shielding layer 102 reduces the influence of square waves and high-order harmonics and improves the overall strength of the cable body 1. The conductor shielding layer 106 and the power core insulation layer 105 are provided on the outside of the power core to further improve the insulation performance and wave resistance. The monitoring core insulation layer 109 is provided on the outside of the monitoring core conductor 110 to improve the insulation performance of the monitoring core. The inner sheath 103 is wrapped around the outside of the insulating shielding layer 104 and the ground core conductor 108, so that the ground core conductor 108 and the insulating shielding layer 104 will not rub against the aluminum-plastic tape and copper wire braided shielding layer 102. Fillers 111 are provided between multiple groups of insulating shielding layers 104 to prevent multiple groups of insulating shielding layers 104 from wearing each other, thereby improving the durability of the entire frequency conversion cable, making the entire frequency conversion cable more integrated, and improving the tensile strength of the frequency conversion cable.

[0034] Please refer to Figures 2 to 5The end of the cable body 1 is provided with a connecting component 2, which includes a first fixed sleeve 201, the first fixed sleeve 201 is fixedly connected to one end of the outer sheath 101, the outer wall of the first fixed sleeve 201 is rotatably connected to a threaded sleeve 203, the inner wall of the threaded sleeve 203 is threadedly connected to a second fixed sleeve 202, the inner wall of the second fixed sleeve 202 is sleeved with another group of outer sheaths 101, one end of the insulating shielding layer 104 is fixedly sleeved with a first connecting copper tube 204, the end of the ground core conductor 108 is fixedly sleeved with a second connecting copper tube 205, the side walls of the first fixed sleeve 201 and the second fixed sleeve 202 are respectively fixedly connected with a group of sliders 206, the outer wall sliding sleeves of the two groups of sliders 206 are provided with a fixed plate 207, and the side wall of the fixed plate 207 is slidably connected There is a side plate 208, and the inner wall of the side plate 208 is slidingly connected to multiple groups of inclined blocks 209, and the side walls of the multiple groups of inclined blocks 209 are respectively fixedly connected to one end of a support spring 210, and the other end of the support spring 210 is fixedly connected to the inner wall of the side plate 208. The inner wall of the fixed plate 207 is rotatably connected to a two-way threaded rod 211 extending to the outside of the fixed plate 207, and the outer wall of the two-way threaded rod 211 is threadedly connected to two groups of pushing blocks 212, and the side walls of the two groups of pushing blocks 212 are respectively hinged to a group of top plates 213, and the ends of the two groups of top plates 213 are hinged to the side walls of the side plate 208, and one end of the two-way threaded rod 211 located on the outside of the fixed plate 207 is fixedly connected to a hexagonal nut, and the thread directions of the two-way threaded rod 211 at the contact position with the two groups of pushing blocks 212 are opposite.

[0035] By pushing the sliders 206 on the two groups of cable bodies 1 into the side walls of the fixed plate 207, and by pushing the two groups of sliders 206 closer to each other, the power core body 107 and the monitoring core conductor 110 on one group of cable bodies 1 are inserted into the first connecting copper tube 204 and the second connecting copper tube 205 on the other group of cable bodies 1, and then the threaded sleeve 203 is rotated so that the threaded sleeve 203 is threadedly connected to the outside of the second fixed sleeve 202, so that the two groups of cable bodies 1 are tightly connected together. When the slider 206 slides into the fixed plate 207, the slider 206 pushes the inclined block 209 so that the inclined block 209 compresses the support spring 210. After the slider 206 passes through a group of inclined blocks 209, the support spring 210 rebounds and pushes this group of inclined blocks 209 to reset. At this time, if the two groups of sliders 206 are pushed away from each other, the inclined blocks next to the two groups of sliders 206 The block 209 will block the two groups of inclined blocks 209, making it impossible for the two groups of inclined blocks 209 to move away from each other, making it impossible for the two groups of cable bodies 1 to be separated, and the connection between the slider 206 and the fixed plate 207 is used to make the connection between the two groups of cable bodies 1 stronger and less likely to break. When the two groups of cable bodies 1 need to be separated, the two-way threaded rod 211 is rotated so that the two-way threaded rod 211 pushes the connecting pushing blocks 212 away from each other, so that the two groups of pushing blocks 212 respectively pull the two groups of top plates 213, thereby driving the side plates 208 to slide toward the inside of the fixed plate 207, so that the fixed plate 207 drives the inclined block 209 to move, so that the inclined block 209 and the slider 206 cannot contact each other. At this time, the threaded sleeve 203 is rotated in the opposite direction to separate the threaded sleeve 203 from the second fixed sleeve 202, and the two groups of cable bodies 1 can be pulled apart.

[0036] Please refer to Figure 6 and Figure 7 A group of buffer mounting components 3 are respectively provided at the top and bottom ends of the fixed plate 207. The buffer mounting component 3 includes a slide groove 301. The slide groove 301 is opened on the side wall of the fixed plate 207. The inner wall of the slide groove 301 is slidably connected with two groups of fixed blocks 302. The inner wall of the fixed block 302 is slidably connected with a head 303 extending into the interior of the slide groove 301. The inner wall of the slide groove 301 is provided with multiple groups of grooves 304 that match the head 303. One end of the head 303 located inside the fixed block 302 is fixedly connected to one end of a return spring 305. The other end of the return spring 305 is fixedly connected to the inner wall of the fixed block 302. The side wall of the fixed block 302 is provided with a bolt hole 306.

[0037] By using bolts to pass through the bolt holes 306, and then fixing the fixing block 302 to a wall or other higher place, the cable body 1 is fixed and not easily touched by people. When the cable body 1 is accidentally pulled, sliding occurs between the fixing plate 207 and the fixing block 302, so that the top head 303 is pushed by the groove 304, thereby pushing the top head 303 to compress the return spring 305. When the top head 303 is aligned with another set of grooves 304, the return spring 305 pushes the top head 303 to return. At this time, the top head 303 slides into the inside of the other set of grooves 304, and the sliding between the fixing plate 207 and the fixing block 302 is used to make the return spring 305 continuously compressed and rebound, so that the force pulling the cable body 1 is consumed, preventing the cable body 1 from being broken.

[0038] During use, an inner sheath 103 is provided so that the inner sheath 103 is wrapped around the outside of the insulating shielding layer 104 and the ground core conductor 108, so that the ground core conductor 108 and the insulating shielding layer 104 will not rub against the aluminum-plastic tape copper wire braided shielding layer 102. Fillers 111 are provided between multiple groups of insulating shielding layers 104, so that the multiple groups of insulating shielding layers 104 will not wear each other, thereby improving the durability of the entire frequency conversion cable, making the entire frequency conversion cable more integrated, and improving the tensile strength of the frequency conversion cable. The parts not involved in the device are the same as the existing technology or can be implemented using existing technology.

[0039] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A novel 10kV medium voltage frequency conversion cable for a coal mine frequency conversion device, comprising a cable body (1), characterized in that: The cable body (1) comprises an outer sheath (101), the inner wall of the outer sheath (101) is fixedly provided with an aluminum-plastic tape copper wire braided shielding layer (102), the inner wall of the aluminum-plastic tape copper wire braided shielding layer (102) is provided with multiple groups of insulating shielding layers (104), the inner walls of the multiple groups of insulating shielding layers (104) are respectively fixedly provided with a group of power core insulating layers (105), the inner wall of the power core insulating layer (105) is fixedly provided with a conductor shielding layer (106), the conductor The inner wall fixed sleeve of the body shielding layer (106) is provided with a power core body (107), the inner wall sleeve of the aluminum-plastic tape copper wire braided shielding layer (102) is provided with multiple groups of ground core conductors (108), the inner wall fixed sleeve of the ground core conductor (108) is provided with a monitoring core insulation layer (109), the inner wall fixed sleeve of the monitoring core insulation layer (109) is provided with a monitoring core conductor (110), and the multiple groups of ground core conductors (108) are surrounded by the outside of the multiple groups of insulating shielding layers (104).

2. A novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 1, characterized in that: A filler (111) is provided between the multiple groups of insulating shielding layers (104) and the multiple groups of ground core conductors (108), and an inner sheath (103) is provided between the aluminum-plastic tape copper wire braided shielding layer (102) and the multiple groups of insulating shielding layers (104).

3. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 1 is characterized in that: The end of the cable body (1) is provided with a connecting assembly (2), and the connecting assembly (2) comprises a first fixing sleeve (201), the first fixing sleeve (201) is fixedly connected to one end of the outer sheath (101), the outer wall of the first fixing sleeve (201) is rotatably connected to a threaded sleeve (203), the inner wall of the threaded sleeve (203) is threadedly connected to a second fixing sleeve (202), and the inner wall of the second fixing sleeve (202) is provided with another set of outer sheaths (101).

4. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 1 is characterized in that: One end of the insulating shielding layer (104) is fixedly sleeved with a first connecting copper tube (204), and the end of the ground core conductor (108) is fixedly sleeved with a second connecting copper tube (205).

5. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 3 is characterized by: The side walls of the first fixed sleeve (201) and the second fixed sleeve (202) are respectively fixedly connected to a group of sliders (206), the outer wall sliding sleeves of the two groups of sliders (206) are provided with fixed plates (207), the side walls of the fixed plates (207) are slidably connected to side plates (208), and the inner walls of the side plates (208) are slidably connected to multiple groups of inclined blocks (209).

6. A novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 5, characterized in that: The side walls of the plurality of groups of inclined blocks (209) are respectively fixedly connected to one end of a support spring (210), and the other end of the support spring (210) is fixedly connected to the inner wall of the side plate (208).

7. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 5 is characterized in that: The inner wall of the fixed plate (207) is rotatably connected to a bidirectional threaded rod (211) extending to the outside of the fixed plate (207), and the outer wall of the bidirectional threaded rod (211) is threadedly connected to two groups of pushing blocks (212), and the side walls of the two groups of pushing blocks (212) are respectively hinged to a group of top plates (213), and the ends of the two groups of top plates (213) are hinged to the side walls of the side plates (208).

8. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 7 is characterized in that: One end of the bidirectional threaded rod (211) located outside the fixed plate (207) is fixedly connected to a hexagonal nut, and the thread directions of the bidirectional threaded rod (211) at the contact positions with the two groups of push blocks (212) are opposite.

9. The novel 10kV medium voltage frequency conversion cable for coal mine frequency conversion device according to claim 5, characterized in that: A group of buffer mounting components (3) are respectively provided at the top and bottom ends of the fixed plate (207), and the buffer mounting component (3) includes a slide groove (301), the slide groove (301) is opened on the side wall of the fixed plate (207), the inner wall of the slide groove (301) is slidably connected with two groups of fixed blocks (302), the inner wall of the fixed block (302) is slidably connected with a head (303) extending into the interior of the slide groove (301), the inner wall of the slide groove (301) is provided with multiple groups of grooves (304) that match the head (303), one end of the head (303) located inside the fixed block (302) is fixedly connected to one end of a return spring (305), the other end of the return spring (305) is fixedly connected to the inner wall of the fixed block (302), and the side wall of the fixed block (302) is provided with a bolt hole (306).

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