Explosion-proof cable and preparation method thereof

Abstract

The invention relates to the technical field of cable preparation, in particular to an explosion-proof cable and a preparation method thereof. The cable dipping device comprises a dipping box and a frame body, a traction mechanism is arranged in the dipping box, the traction mechanism comprises a hanging mechanism and a driving mechanism, the hanging mechanism hangs a cable in the dipping box, the driving mechanism drives the hanging mechanism to rotate, in the dipping process, the cable is subjected to two-way displacement dipping, and in the draining process, the cable is subjected to two-way displacement dipping. Adjusting the lowest position of the cable; according to the cable dipping device, the cable is hung in the dipping box through the hanging mechanism, in the dipping process, the driving mechanism can drive the hanging mechanism to rotate and adjust the dipping direction of the cable, after dipping is completed, the hanging mechanism can assist in draining the cable, and the driving mechanism drives the hanging mechanism to rotate to adjust the clamping position of the cable; the situation that the impregnation liquid is gathered at the lowest position of the cable due to the gravity effect is effectively reduced, and the cable impregnation uniformity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable preparation, in particular to an explosion-proof cable and a preparation method thereof. Background Art

[0002] In modern industry and daily life, cables play a vital role. Cables are usually used to transmit power and signals. Their performance and safety are directly related to the normal operation of various fields. Cables are generally composed of conductors, insulation layers, sheaths and other parts, mainly to meet the conventional power and signal transmission needs. However, in some special environments, such as dangerous places with flammable and explosive gases, dust, etc., ordinary cables cannot meet the safety requirements. At this time, explosion-proof cables are needed; Explosion-proof cables are specially designed for use in hazardous environments. They have special structures and properties that can effectively prevent sparks, arcs and other explosion-causing factors from occurring in hazardous environments. In order to achieve explosion-proof effects, cables usually need to undergo an impregnation process, which can make the insulation layer of the cable tighter and more uniform, improve the insulation performance and corrosion resistance of the cable, and also enhance the explosion-proof performance of the cable, ensuring safe and reliable operation in hazardous environments. Since cables are usually long in size, continuous dipping is often used during dipping. Currently, when dipping explosion-proof cables, both ends of the cables are mostly fixed, with the middle part suspended. After the dipping is completed, the cables are allowed to drain freely. However, this dipping process has some problems: First, during the impregnation process, the cable is in a unidirectional impregnation state. During the unidirectional static impregnation, the impregnation liquid mainly penetrates into the insulation layer and other parts of the cable by free diffusion. At this time, the flow direction of the impregnation liquid on the surface and inside of the cable is relatively single, which can easily lead to uneven impregnation and affect the overall explosion-proof performance of the cable; Secondly, during the draining process after the impregnation, because the cable is a structure with both ends fixed and the middle part suspended, the impregnation liquid will drip at the lowest point of the cable due to its own gravity during free draining, resulting in inconsistent impregnation thickness on the cable surface, thus affecting the quality and performance of the cable; In view of this, there is an urgent need for an explosion-proof cable and a preparation method thereof to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide an explosion-proof cable and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides a method for preparing an explosion-proof cable, comprising the following steps: S1. Material preparation: Select explosion-proof cables with high-quality metal conductors and inspect the conductor materials; then select insulating materials with good insulation performance, high temperature resistance and wear resistance for drying. In addition, the impregnation liquid is prepared and filtered; S2. Cable core correction: twist the prepared conductors into an integrated cable core according to the specified direction and pitch; S3, wrapping the insulation layer: start the extruder for preheating, then add the insulation material into the extruder, control the cable core to pass through the extruder, so that the insulation layer extruded by the extruder is evenly wrapped on the cable core to form a wire core; S4, pretreatment: Use cleaning tools or equipment to clean the surface of the wire core, and dry the cleaned wire core; S5, impregnation and drying: placing the pretreated wire core into an impregnation container body containing an impregnation liquid, and after the impregnation is completed, draining the impregnated cable; S6, molding: cabling the dried and solidified wire cores in the specified direction and arrangement, so that multiple wire cores are combined into a whole, and a layer of outer sheath is wrapped around the outside of the cable after cabling; The impregnation container body in S5 includes an impregnation box and a frame body, wherein the impregnation box is installed inside the frame body, and the impregnation liquid is contained inside the impregnation box. An impregnation liquid flow mechanism is installed at the bottom end of the impregnation box, and the impregnation liquid flow mechanism is used to control the delivery of the impregnation liquid. The inner walls at both ends of the impregnation box are respectively provided with a cable entry hole and a cable exit hole, and a support roller is provided at one end of the impregnation box close to the cable entry hole, and the support roller is connected to the side wall of the impregnation box through a rod body; A traction mechanism is provided inside the impregnation box, and the traction mechanism includes a hanging mechanism and a driving mechanism. The hanging mechanism is used to hang the cable inside the impregnation box. During the impregnation process, the driving mechanism drives the hanging mechanism to rotate to perform bidirectional immersion on the cable. During the draining process, the rotation of the hanging mechanism is used to change the lowest position of the cable.

[0005] As a further improvement of the technical solution, two hanging mechanisms are provided, and both of the two hanging mechanisms include a first clamping wheel and a second clamping wheel, the first clamping wheel and the second clamping wheel are of equal size, a plurality of teeth are fixedly installed on the outer walls of the first clamping wheel and the second clamping wheel, a traction cavity is formed between the first clamping wheel and the second clamping wheel, support rods are provided at the bottom ends of the first clamping wheel and the second clamping wheel, the first clamping wheel and the second clamping wheel are rotatably connected to the top end of the support rod, and the other ends of the two support rods are fixedly connected to the inner wall of the impregnation box.

[0006] As a further improvement of the present technical solution, the impregnation liquid flow mechanism includes a receiving plate fixedly connected to the bottom of the inner cavity of the impregnation box, a liquid inlet pipe is installed at the bottom of one end of the impregnation box close to the cable inlet hole, and a liquid outlet pipe is installed at the bottom of one end of the impregnation box close to the cable outlet hole. The top ends of the liquid inlet pipe and the liquid outlet pipe are flush with the surface of the receiving plate, the end of the liquid inlet pipe away from the impregnation box is connected to a pump body, and valve bodies are installed inside the ends of the liquid inlet pipe and the liquid outlet pipe close to the impregnation box.

[0007] As a further improvement of the present technical solution, two driving mechanisms are provided, each of the two driving mechanisms includes a sleeve plate, the two sleeve plates are fixedly mounted on the outer wall of the impregnation box, a three-axis gearbox is mounted on the surface of the two sleeve plates, a driving motor is fixedly mounted on the surface of the sleeve plates, two output shafts of the three-axis gearbox are respectively fixedly mounted with extension shafts, the other ends of the two extension shafts are respectively fixedly connected to the first clamping wheel and the second clamping wheel, and the input shaft of the three-axis gearbox is coaxially connected to the output shaft of the driving motor.

[0008] As a further improvement of the technical solution, the surface of the receiving plate is inclined toward one side of the cable outlet hole.

[0009] As a further improvement of the technical solution, the two first clamping wheels and the second clamping wheels are fixedly connected to a top plate at one end close to the extension shaft, and the diameters of the four top plates are larger than those of the first clamping wheels and the second clamping wheels.

[0010] As a further improvement of the technical solution, bottoms of the two first clamping wheels and the second clamping wheels are respectively provided with bottom wheel seats, two adjacent bottom wheel seats are meshedly connected, and the four bottom wheel seats are fixedly connected to the support rod.

[0011] As a further improvement of the technical solution, the cable entry hole and the cable exit hole are both provided with sealing inner pads, both of which are made of elastic material, and the cable entry hole and the cable exit hole are fixedly connected with sealing rings on one side away from the inside of the impregnation box.

[0012] As a further improvement of the technical solution, the explosion-proof cable obtained by the above-mentioned preparation method includes a conductor layer, an insulating surface, a flame retardant layer, an impregnation layer and a sheath layer.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the preparation method of the explosion-proof cable, the pretreated cable can be continuously impregnated in the impregnation container body. A hanging mechanism is provided in the impregnation box, and the cable can be hung in the impregnation box in the form of a middle section suspended in the air. During the impregnation process, the driving mechanism can drive the hanging mechanism to rotate and adjust the impregnation direction of the cable. The cable can move inside the traction cavity. In this way, during the impregnation process, the impregnation direction of the cable can be adjusted, thereby greatly improving the uniformity of the cable impregnation. After the impregnation is completed, the impregnation liquid flow mechanism will discharge the impregnation liquid in the impregnation box. At this time, the hanging mechanism can assist the cable to drain, and the driving mechanism drives the hanging mechanism to rotate to adjust the clamping position of the cable, effectively reducing the situation where the impregnation liquid accumulates at the lower end of the cable due to gravity, thereby improving the uniformity of cable impregnation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cable preparation process structure of the present invention; Figure 2 It is a schematic diagram of the structure of the impregnation container body of the present invention; Figure 3 It is a schematic diagram of the internal structure of the impregnation container body of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the structure at A; Figure 5 A top view of the traction mechanism of the present invention in a running state; Figure 6 It is a schematic diagram of the adjustment structure of the cable of the present invention inside the impregnation container body; Figure 7 It is a cutaway front view of the dipping container body of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at B; Fig. 9 It is a cross-sectional view of the cable body of the present invention.

[0015] The meaning of each number in the figure is: 1. Dipping container body; 11. Dipping box; 12. Frame body; 13. Cable entry hole; 14. Cable exit hole; 15. Support roller; 2. Traction mechanism; 21. Hooking mechanism; 22. Driving mechanism; 211, first clamping wheel; 212, second clamping wheel; 213, traction cavity; 214, support rod; 215, teeth; 221, sleeve plate; 222, drive motor; 223, three-axis gear box; 224, extension shaft; 3. Immersing liquid flow mechanism; 31. Receiving plate; 32. Liquid inlet pipe; 33. Pump body; 34. Liquid outlet pipe; 4. Top plate; 5. Bottom wheel seat; 6. Sealing ring; 61. Sealing inner gasket; 100, conductor layer; 200, insulation surface; 300, flame retardant layer; 400, impregnation layer; 500, sheath layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] For examples, see Figure 1 and Figure 2 As shown, the purpose of this embodiment is to provide a method for preparing an explosion-proof cable, comprising the following steps: Step 1: Material preparation: Select explosion-proof cables with high-quality metal conductors and inspect the conductor materials; then select insulating materials with good insulation performance, high temperature resistance and wear resistance for drying. In addition, the impregnation liquid is prepared and filtered; Step 2: Cable core correction: twist the prepared conductors into an integrated cable core according to the specified direction and pitch; Step 3: Wrap the insulation layer: start the extruder for preheating, then add the insulation material into the extruder, control the cable core to pass through the extruder, so that the insulation layer extruded by the extruder is evenly wrapped on the cable core to form a wire core; Step 4: Pretreatment: Use cleaning tools or equipment to clean the surface of the wire core and dry the cleaned wire core; Step 5, impregnation and drying: placing the pre-treated wire core into the impregnation container body 1 containing the impregnation liquid, and after the impregnation is completed, draining the impregnated cable; Step 6: Molding: The dried and solidified wire cores are cabled in the specified direction and arrangement so that multiple wire cores are combined into a whole, and an outer sheath is wrapped around the cable after cabling; The impregnation container body 1 in step five includes an impregnation box 11 and a frame body 12, the impregnation box 11 is installed inside the frame body 12, the impregnation box 11 is filled with impregnation liquid, an impregnation liquid flow mechanism 3 is installed at the bottom end of the impregnation box 11, and the impregnation liquid flow mechanism 3 is used to control the delivery of the impregnation liquid. The inner walls at both ends of the impregnation box 11 are respectively provided with a cable inlet hole 13 and a cable outlet hole 14, and a support roller 15 is provided at one end of the impregnation box 11 close to the cable inlet hole 13, and the support roller 15 is connected to the side wall of the impregnation box 11 through a rod body; A traction mechanism 2 is provided inside the impregnation box 11, and the traction mechanism 2 includes a hanging mechanism 21 and a driving mechanism 22. The hanging mechanism 21 is used to hang the cable inside the impregnation box 11. During the impregnation process, the driving mechanism 22 drives the hanging mechanism 21 to rotate, and the cable is impregnated in both directions. During the draining process, the rotation of the hanging mechanism 21 is used to change the lowest position of the cable.

[0018] When the cable is impregnated, in order to further improve the impregnation effect, the cable can be hung inside the impregnation box 11 by a hanging mechanism 21. The specific structure of the hanging mechanism 21 is disclosed below. Two hanging mechanisms 21 are provided, and the two hanging mechanisms 21 include a first clamping wheel 211 and a second clamping wheel 212. The first clamping wheel 211 and the second clamping wheel 212 are of the same size. The outer walls of the first clamping wheel 211 and the second clamping wheel 212 are fixedly installed with a plurality of teeth 215. A traction cavity 213 is formed between the first clamping wheel 211 and the second clamping wheel 212. The bottom ends of the first clamping wheel 211 and the second clamping wheel 212 are provided with support rods 214. The first clamping wheel 211 and the second clamping wheel 212 are rotatably connected to the top of the support rod 214, and the other ends of the two support rods 214 are fixedly connected to the inner wall of the impregnation box 11.

[0019] See also Figure 4 and Figure 7 As shown, the first clamping wheel 211 and the second clamping wheel 212 are stably supported by two supporting rods 214. Under such support, the first clamping wheel 211 and the second clamping wheel 212 can be stably placed inside the dipping box 11 in a vertical state, and a traction cavity 213 is formed between the first clamping wheel 211 and the second clamping wheel 212. When the cable passes through the cable entry hole 13 and is pulled out from the cable exit hole 14, the part of the cable located inside the dipping box 11 near the two ends will be in the two traction cavities 213, so that the cable can be suspended in the dipping box 11 for dipping operation.

[0020] In the traction cavity 213, with the aid of a plurality of teeth 215 installed on the surface of the first clamping wheel 211 and the second clamping wheel 212, the friction between the first clamping wheel 211 and the second clamping wheel 212 and the surface of the cable can be increased. The enhancement of the friction can make the cable more stably hung in the traction cavity 213, effectively reduce the instability of the cable such as slipping and shifting during the impregnation operation, and ensure the smooth progress of the impregnation process. Among them, the surface of the teeth 215 is a soft structure (such as laying a sponge), and while using friction transportation, it will not cause clamping damage to the cable.

[0021] It should be noted that the length of the cable in the impregnation box 11 needs to be greater than the internal size of the impregnation box 11, so that more parts of the cable in the impregnation box 11 can be fully in contact with the impregnation liquid, increasing the effective area of ​​​​impregnation, thereby achieving a more complete impregnation effect per unit time and improving the efficiency of the entire impregnation operation.

[0022] After the cables are placed in the immersion box 11, the immersion liquid needs to be transported to the inside of the immersion box 11, and the liquid level of the immersion liquid needs to cover the cables so as to carry out the immersion operation. Here, the specific structure of the immersion liquid flow mechanism 3 is disclosed. The immersion liquid flow mechanism 3 includes a receiving plate 31 fixedly connected to the bottom of the inner cavity of the immersion box 11, a liquid inlet pipe 32 is installed at the bottom of one end of the immersion box 11 close to the cable inlet hole 13, and a liquid outlet pipe 34 is installed at the bottom of one end of the immersion box 11 close to the cable outlet hole 14. The top ends of the liquid inlet pipe 32 and the liquid outlet pipe 34 are flush with the surface of the receiving plate 31, the end of the liquid inlet pipe 32 away from the immersion box 11 is connected to a pump body 33, and valve bodies are installed inside the ends of the liquid inlet pipe 32 and the liquid outlet pipe 34 close to the immersion box 11.

[0023] In the initial state, the valve bodies inside the liquid inlet pipe 32 and the liquid outlet pipe 34 are both in a closed state. Figure 7 It can be seen that after the cable is hung, the pump body 33 is started and the valve body inside the liquid inlet pipe 32 is opened, and the impregnation liquid can be transported from the liquid inlet pipe 32 to the impregnation box 11. When the impregnation liquid covers the cable, the pump body 33 and the valve body inside the liquid inlet pipe 32 are closed, and then the cable starts to be impregnated. When the impregnation operation is completed, the valve body inside the liquid outlet pipe 34 is opened, so that the impregnation liquid in the impregnation box 11 can be discharged from the impregnation box 11 through the liquid outlet pipe 34. It should be noted that: since the cable adopts a continuous impregnation method, if this impregnation is not the last time, the impregnation liquid only needs to be discharged to the lowest end where its liquid level is lower than the cable, which can effectively save the feeding time of the impregnation liquid during the next impregnation, improve the efficiency of the entire continuous impregnation process, and at the same time ensure the effective connection between the impregnation operations, ensure the smooth progress of the entire impregnation process, and further improve the production efficiency and benefits.

[0024] Among them, the impregnation liquid for impregnating the explosion-proof cable can be epoxy resin impregnation varnish. After appropriate dilution, the epoxy resin impregnation varnish has good electrical insulation, can prevent leakage, and ensure the electrical safety of the explosion-proof cable during use. The impregnation process is carried out at room temperature.

[0025] The above-mentioned valve body adopts an electric control valve, which, as is well known to those skilled in the art, mainly drives the actuator through an electrical signal to control the opening and closing state of the valve body. It includes a motor, a transmission mechanism and a valve body component. When an opening or closing electrical signal is received, the motor starts to run, and the rotational motion of the motor is converted through a transmission mechanism (such as gears, screws) to convert the rotational motion into linear motion or appropriate angular motion, thereby pushing the valve core or gate and other components inside the valve body.

[0026] In the cable impregnation operation, if the hanging position of the cable is fixed and too single, it is very easy for the cable surface to be unevenly impregnated during the impregnation process. Therefore, through the coordinated operation of the driving mechanism 22 and the hanging mechanism 21, the hanging position of the cable can be flexibly adjusted, so that the cable can be fully and evenly contacted with the impregnation liquid at various positions in the impregnation box 11. The specific structure of the driving mechanism 22 is disclosed below. There are two driving mechanisms 22. The two driving mechanisms 22 both include sleeves 221. The two sleeves 221 are fixedly mounted on the outer wall of the impregnation box 11. Three-axis gear boxes 223 are installed on the surfaces of the two sleeves 221. A driving motor 222 is fixedly mounted on the surface of the sleeves 221. The two output shafts of the three-axis gear box 223 are respectively fixedly mounted with extension shafts 224. The other ends of the two extension shafts 224 are respectively fixedly connected to the first clamping wheel 211 and the second clamping wheel 212. The input shaft of the three-axis gear box 223 is coaxially connected to the output shaft of the driving motor 222.

[0027] See also Figure 3 Combined with Figure 7 As shown, during the cable impregnation process, two driving motors 222 are started at the same time, causing the two three-axis gear boxes 223 to operate synchronously and at the same speed. In this operating state, the first clamping wheel 211 and the second clamping wheel 212 on the same side will rotate in opposite directions at the same speed. When they rotate, the cable can move inside the traction cavity 213. In this way, during the impregnation process, the impregnation direction of the cable can be adjusted, thereby greatly improving the uniformity of the cable impregnation; The reason why adjusting the impregnation direction of the cable can improve the uniformity of the cable impregnation is that when the cable is adjusted left and right to achieve bidirectional impregnation, the relative movement mode of the impregnation liquid and the cable changes, and the impregnation liquid can contact the cable from different angles and positions. During the reciprocating motion of the cable, the impregnation liquid can be more fully filled into the pores of various parts of the cable, avoiding excessive or insufficient local impregnation, thereby effectively improving the uniformity of the cable impregnation.

[0028] When the driving motor 222 is started, the driving motor 222 transmits power to the three-axis gear box 223. The interior of the three-axis gear box 223 is mainly composed of a plurality of gears of different sizes meshing with each other. The principle is to receive the power of the driving motor 222 through the input shaft, and then use the gear ratio between different gears to change the speed and torque, and distribute the power to the other two output shafts. In this solution, the two output shafts are respectively connected to the extension shaft 224, and finally drive the first clamping wheel 211 and the second clamping wheel 212 to rotate. In this operating state, due to the transmission characteristics of the three-axis gear box 223, the first clamping wheel 211 and the second clamping wheel 212 on the same side will rotate in the same direction at the same speed. The surfaces of the first clamping wheel 211 and the second clamping wheel 212 are designed with teeth 215, and these teeth 215 are in close contact with the surface of the cable. When the two rotate in opposite directions, friction is generated between the teeth 215 and the cable. This friction is sufficient to overcome the static inertia of the cable in the traction cavity 213, thereby pushing the cable to move inside the traction cavity 213, and realizing dynamic adjustment of the cable position.

[0029] During the impregnation process, the first clamping wheel 211 and the second clamping wheel 212 start to rotate, and the cable moves accordingly. When the first clamping wheel 211 and the second clamping wheel 212 rotate, they will drive the surrounding impregnation liquid to flow, and the movement of the cable will further disrupt the original state of the impregnation liquid, causing the impregnation liquid to form a complex flow pattern, thereby enhancing the convection effect inside the impregnation liquid, prompting the various parts of the impregnation liquid to be fully mixed, achieving stirring of the impregnation liquid, and helping to maintain the uniformity of the impregnation liquid composition, so that all parts of the cable can be exposed to the impregnation liquid of the same nature, further improving the uniformity of the cable impregnation.

[0030] When the cables in the impregnation box 11 have completed impregnation, the cables need to be drained next. After the impregnation liquid is discharged, the drive motor 222 is started again, and the first clamping wheel 211 and the second clamping wheel 212 rotate again. At this time, the rotation of the first clamping wheel 211 and the second clamping wheel 212 will produce an extrusion effect on the surface of the impregnated cable. Through extrusion, the air that may exist on the surface and inside of the cable can be discharged, so that the impregnation liquid can be better absorbed by the cable, thereby enhancing the impregnation effect. As the first clamping wheel 211 and the second clamping wheel 212 rotate, the position of the cable also changes accordingly, which can effectively reduce the situation where a large amount of impregnation liquid accumulates at the lower end of the cable due to gravity. In addition, during the entire cable draining process, the drained impregnation liquid can also be collected to improve resource utilization.

[0031] In the process of cable impregnation, the impregnation liquid needs to be discharged after the impregnation of the cable is completed. Therefore, the surface of the receiving plate 31 is inclined toward one side of the cable outlet hole 14 .

[0032] like Figure 7As shown, the surface of the receiving plate 31 is inclined toward one end of the cable outlet hole 14, and the liquid outlet pipe 34 is located at an end close to the cable outlet hole 14. The inclination of the receiving plate 31 allows the impregnating liquid to smoothly converge in the direction of the liquid outlet pipe 34, so that the impregnating liquid can flow out through the liquid outlet pipe 34 more efficiently when discharged.

[0033] Taking into account the risk that the cable may slip out of the traction cavity 213 during movement, in order to reduce the occurrence of this situation, the two first clamping wheels 211 and the second clamping wheels 212 are fixedly connected to a top plate 4 at one end close to the extension shaft 224, and the diameters of the four top plates 4 are all larger than the first clamping wheels 211 and the second clamping wheels 212.

[0034] See also Figure 4 As shown, when the cable moves under the action of the first clamping wheel 211 and the second clamping wheel 212, the top plate 4 can prevent the cable from sliding out from the upper edge of the traction cavity 213, ensuring that the cable can move inside the traction cavity 213, thereby ensuring the stability and safety of the impregnation process.

[0035] Since the position of the cable needs to be precisely controlled and effective support needs to be provided for the cable during the cable immersion and subsequent draining process, the bottom of the two first clamping wheels 211 and the second clamping wheel 212 are respectively installed with bottom wheel seats 5, and the two adjacent bottom wheel seats 5 are meshedly connected, and the four bottom wheel seats 5 are fixedly connected to the support rod 214.

[0036] Combination Figure 3 and Figure 4 As shown, two adjacent bottom wheel seats 5 are connected in a meshing manner, which can make the connection between them more stable. The four bottom wheel seats 5 are fixedly connected to the support rod 214 to provide stable support for the cable, effectively limit the position of the bottom of the cable, and ensure that the cable will not shake or sag at will during the impregnation process; During the draining process, the bottom wheel seat 5 can scrape the surface of the cable, which helps to promote the separation of the impregnation liquid from the cable surface and speed up the draining speed. In addition, the corners of the bottom wheel seat 5 are designed to be inclined (not shown in the figure). During the contact with the cable, the inclined corners will not scratch the cable, reducing damage to the cable sheath and ensuring the quality and integrity of the cable.

[0037] During the cable impregnation process, since it is necessary to ensure the sealing inside the impregnation box 11, sealing inner pads 61 are laid inside the cable entry hole 13 and the cable outlet hole 14. The two sealing inner pads 61 are both made of elastic material, and the cable entry hole 13 and the cable outlet hole 14 are fixedly connected to the side away from the inside of the impregnation box 11 with a sealing ring 6.

[0038] like Figure 8As shown, a sealing inner gasket 61 is laid inside the cable entry hole 13 and the cable outlet hole 14, and the sealing inner gasket 61 is made of elastic material (rubber material is preferably selected). When the cable passes through the cable entry hole 13 or the cable outlet hole 14, the elastic sealing inner gasket 61 will automatically adjust its shape according to the outer diameter of the cable and fit tightly to the surface of the cable, thereby effectively filling the small gap between the cable and the hole wall, forming a reliable seal, and reducing the leakage of the impregnation liquid. At the same time, a sealing ring 6 is fixedly connected to the side of the cable entry hole 13 and the cable outlet hole 14 away from the inside of the impregnation box 11, and the sealing ring 6 cooperates with the sealing inner gasket 61 to further enhance the overall sealing effect.

[0039] The explosion-proof cable obtained by the above preparation method includes a conductor layer 100 , an insulating surface 200 , a flame retardant layer 300 , an impregnation layer 400 and a sheath layer 500 .

[0040] In summary, the working principle of the present invention is as follows: when the cable is inserted from the cable inlet hole 13 and pulled out from the cable outlet hole 14, the portion of the cable located inside the impregnation box 11 near the two ends will be in the two traction chambers 213, so that the cable can be suspended in the impregnation box 11 for impregnation. In the initial state, the valve bodies inside the liquid inlet pipe 32 and the liquid outlet pipe 34 are both in a closed state. Figure 7 It can be seen that after the cable is hung, the pump body 33 is started and the valve body inside the liquid inlet pipe 32 is opened, and the impregnation liquid can be transported from the liquid inlet pipe 32 to the impregnation box 11. When the impregnation liquid covers the cable, the pump body 33 and the valve body inside the liquid inlet pipe 32 are closed, and then the cable starts to be impregnated. During the cable impregnation process, two driving motors 222 are started at the same time, causing the two three-axis gear boxes 223 to operate synchronously and at the same speed. In this operating state, the first clamping wheel 211 and the second clamping wheel 212 on the same side will rotate in opposite directions at the same speed. When they rotate, the cable can move inside the traction cavity 213. In this way, during the impregnation process, the clamping position of the cable can be adjusted, thereby greatly improving the uniformity of the cable impregnation and effectively reducing the problem of poor impregnation effect due to the obstruction of a certain position; After the cables in the impregnation box 11 have been impregnated, they need to be drained. After the impregnation liquid is discharged, the drive motor 222 is started again, and the first clamping wheel 211 and the second clamping wheel 212 rotate again. At this time, the rotation of the first clamping wheel 211 and the second clamping wheel 212 will produce an extrusion effect on the surface of the impregnated cable. Through the extrusion, the air that may exist on the surface and inside of the cable can be discharged, so that the impregnation liquid can be better absorbed by the cable, thereby enhancing the impregnation effect. As the first clamping wheel 211 and the second clamping wheel 212 rotate, the position of the cable also changes accordingly, which can effectively reduce the situation where a large amount of impregnation liquid accumulates at the lower end of the cable due to gravity. In addition, during the entire cable draining process, the drained impregnation liquid can also be collected to improve resource utilization.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing an explosion-proof cable, characterized in that: The steps include: S1. Material preparation: Select explosion-proof cables with high-quality metal conductors and inspect the conductor materials; then select insulating materials with good insulation performance, high temperature resistance and wear resistance for drying. In addition, the impregnation liquid is prepared and filtered; S2. Cable core correction: twist the prepared conductors into an integrated cable core according to the specified direction and pitch; S3, wrapping the insulation layer: start the extruder for preheating, then add the insulation material into the extruder, control the cable core to pass through the extruder, so that the insulation layer extruded by the extruder is evenly wrapped on the cable core to form a wire core; S4, pretreatment: Use cleaning tools or equipment to clean the surface of the wire core, and dry the cleaned wire core; S5, impregnation and drying: placing the pre-treated wire core into an impregnation container body (1) containing an impregnation liquid, and after the impregnation is completed, draining the impregnated cable; S6, molding: cabling the dried and solidified wire cores in the specified direction and arrangement, so that multiple wire cores are combined into a whole, and a layer of outer sheath is wrapped around the outside of the cable after cabling; The impregnation container body (1) in S5 comprises an impregnation box (11) and a frame body (12), the impregnation box (11) being installed inside the frame body (12), the impregnation box (11) containing impregnation liquid inside, an impregnation liquid flow mechanism (3) being installed at the bottom end of the impregnation box (11), the impregnation liquid flow mechanism (3) being used to control the delivery of the impregnation liquid, a cable entry hole (13) and a cable exit hole (14) being respectively provided on the inner walls at both ends of the impregnation box (11), a support roller (15) being provided at one end of the impregnation box (11) close to the cable entry hole (13), the support roller (15) being connected to the side wall of the impregnation box (11) via a rod body; A traction mechanism (2) is arranged inside the impregnation box (11), and the traction mechanism (2) comprises a hanging mechanism (21) and a driving mechanism (22). The hanging mechanism (21) is used to hang the cable inside the impregnation box (11). During the impregnation process, the driving mechanism (22) drives the hanging mechanism (21) to rotate, so as to perform bidirectional impregnation on the cable. During the draining process, the rotation of the hanging mechanism (21) is used to change the lowest position of the cable.

2. The method for preparing an explosion-proof cable according to claim 1, characterized in that: Two hanging mechanisms (21) are provided, and the two hanging mechanisms (21) each comprise a first clamping wheel (211) and a second clamping wheel (212); the first clamping wheel (211) and the second clamping wheel (212) are of equal size; a plurality of teeth (215) are fixedly mounted on the outer walls of the first clamping wheel (211) and the second clamping wheel (212); a traction cavity (213) is formed between the first clamping wheel (211) and the second clamping wheel (212); a support rod (214) is provided at the bottom end of the first clamping wheel (211) and the second clamping wheel (212); the first clamping wheel (211) and the second clamping wheel (212) are rotatably connected to the top end of the support rod (214); and the other ends of the two support rods (214) are fixedly connected to the inner wall of the impregnation box (11).

3. The method for preparing an explosion-proof cable according to claim 1, characterized in that: The impregnation liquid flow mechanism (3) comprises a receiving plate (31) fixedly connected to the bottom of the inner cavity of the impregnation box (11); a liquid inlet pipe (32) is installed at the bottom of one end of the impregnation box (11) close to the cable inlet hole (13); a liquid outlet pipe (34) is installed at the bottom of one end of the impregnation box (11) close to the cable outlet hole (14); the top ends of the liquid inlet pipe (32) and the liquid outlet pipe (34) are both flush with the surface of the receiving plate (31); the end of the liquid inlet pipe (32) away from the impregnation box (11) is connected to a pump body (33); and the ends of the liquid inlet pipe (32) and the liquid outlet pipe (34) close to the impregnation box (11) are both internally installed with valve bodies.

4. The method for preparing an explosion-proof cable according to claim 2, characterized in that: Two driving mechanisms (22) are provided, and the two driving mechanisms (22) each comprise a sleeve plate (221), the two sleeve plates (221) are fixedly mounted on the outer wall of the impregnation box (11), a three-axis gear box (223) is mounted on the surface of the two sleeve plates (221), a driving motor (222) is fixedly mounted on the surface of the sleeve plates (221), two output shafts of the three-axis gear box (223) are respectively fixedly mounted with extension shafts (224), the other ends of the two extension shafts (224) are respectively fixedly connected to the first clamping wheel (211) and the second clamping wheel (212), and the input shaft of the three-axis gear box (223) is coaxially connected to the output shaft of the driving motor (222).

5. The method for preparing an explosion-proof cable according to claim 3, characterized in that: The surface of the receiving plate (31) is inclined toward one side of the cable outlet hole (14).

6. The method for preparing an explosion-proof cable according to claim 2, characterized in that: One end of the two first clamping wheels (211) and the second clamping wheel (212) close to the extension shaft (224) is fixedly connected to a top plate (4), and the diameter of the four top plates (4) is larger than that of the first clamping wheels (211) and the second clamping wheels (212).

7. The method for preparing an explosion-proof cable according to claim 2, characterized in that: Bottom wheel seats (5) are respectively installed at the bottom of the two first clamping wheels (211) and the second clamping wheel (212), two adjacent bottom wheel seats (5) are meshedly connected, and the four bottom wheel seats (5) are all fixedly connected to the support rod (214).

8. The method for preparing an explosion-proof cable according to claim 1, characterized in that: The cable entry hole (13) and the cable exit hole (14) are both provided with sealing inner pads (61), and both of the sealing inner pads (61) are made of elastic material. The cable entry hole (13) and the cable exit hole (14) are both fixedly connected with sealing rings (6) on the sides away from the inside of the impregnation box (11).

9. An explosion-proof cable, characterized in that: The explosion-proof cable is produced by the preparation method of any one of claims 1 to 8, comprising a conductor layer (100), an insulating surface (200), a flame retardant layer (300), an impregnation layer (400) and a sheath layer (500).

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