Uniform irradiation device for irradiation crosslinking of cable insulation

Abstract

This invention discloses a uniform irradiation device for cross-linking cable insulation, relating to the field of irradiation cross-linking technology. It includes a flexible follow-up support assembly installed inside a housing to adaptively conform to the cable's tilt trajectory, and a positioning assembly positioned above and below the ultraviolet irradiation tube to achieve adaptive attitude adjustment of the irradiation tube to match the cable's angle. This invention utilizes an alloy spring as a flexible sensing and actuation integrated element. The alloy spring forms a helical flexible line contact with the cable, resulting in uniform pressure distribution. This reduces damage such as indentations and scratches caused by rigid point-contact clamping to the insufficiently hard insulation layer. When the cable tilts, the alloy spring and the annular plate tilt in tandem, driving the ultraviolet irradiation tube to adaptively adjust to the same angle as the cable. This invention transforms the traditional "rigid point-contact correction" into "flexible conformal following," significantly reducing contact damage and stress risks.

Description

Technical Field

[0001] This invention relates to the field of radiation crosslinking technology, specifically to a uniform irradiation device for radiation crosslinking of cable insulation layers. Background Technology

[0002] Irradiation crosslinking is a technology that uses high-energy radiation such as ultraviolet light to transform polymer molecular chains from a linear to a three-dimensional network structure. A photoinitiator is added to polyolefin insulation materials, and after ultraviolet irradiation, a crosslinking reaction is initiated to form crosslinked polyethylene. Compared with traditional chemical crosslinking, ultraviolet irradiation crosslinking has advantages such as lower investment, lower energy consumption, and no ozone generation. After irradiation crosslinking, the operating temperature of cable insulation is significantly increased, and its wear resistance, solvent resistance, and electrical properties are significantly improved, meeting the requirements of high-safety scenarios such as nuclear power plants and subways. In continuous production, after the cable is coated with insulation by an extruder, it directly enters the irradiation device for crosslinking, followed by cooling water bath for shaping and curing, and finally wound into the finished product by a traction device. The irradiation device is located after the extrusion process and before the cooling process; its irradiation uniformity directly affects product quality.

[0003] For example, CN121790092A discloses a uniform irradiation device for cross-linking cable insulation layers, belonging to the field of cable irradiation. It includes a constraint component and an irradiation cross-linking machine. A cable guide tube is fixedly connected to the outside of the irradiation cross-linking machine, and a housing is fixedly connected to the outside of the cable guide tube. The housing has a first L-groove and a second L-groove on its outer surface. A clamping assembly for supporting the cable is installed inside the housing, and a moving component is also installed inside the housing. Through the constraint component, rotating the first screw facilitates the retraction of the support wheel towards the center, automatically adapting to cables of different diameters and precisely positioning them at the axis of the cable guide tube. This solves the problem of unilateral over-irradiation or under-irradiation caused by cable eccentricity, ensuring the circumferential uniformity of the cross-linking degree of the insulation layer under ultraviolet irradiation, thereby guaranteeing the production quality of the cable.

[0004] In actual production, cables often enter the irradiation crosslinking machine at a slight tilt due to factors such as equipment installation errors, residual stress, temperature gradients, and vibration. This tilted section is only the middle segment of a continuous long cable, with both ends constrained by the extruder and cooling tank, respectively. At this point, the cable is in a naturally tilted equilibrium state, with both ends well-fitted to the upstream and downstream equipment. If the rigid clamping and limiting method commonly used in the comparative patent is used to forcibly correct this middle segment to a horizontal position, it will inevitably cause local bulging or twisting of the cable. While this may improve local irradiation uniformity, it will introduce additional mechanical stress, causing irreversible damage to the insulation layer. Especially for insulation layers that have only undergone natural cooling, their surface hardness is insufficient to withstand excessive compression; rigid point-contact clamping causes even more significant damage to the insulation layer.

[0005] To address the aforementioned issues, there is an urgent need for innovative designs based on existing uniform irradiation devices for cross-linking cable insulation layers. Summary of the Invention

[0006] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a uniform irradiation device for cross-linking cable insulation layers, thereby solving the problem mentioned in the background art where forcibly correcting the middle section to a horizontal position inevitably leads to local bulging or twisting of the cable.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a uniform irradiation device for cross-linking cable insulation, comprising a housing and an ultraviolet irradiation cylinder movably disposed within the housing, and further comprising: A flexible support component installed inside the chassis to adapt to the inclined trajectory of the cable, and a positioning component installed above and below the ultraviolet irradiation tube to achieve adaptive attitude adjustment of the ultraviolet irradiation tube to match the angle of the cable. The flexible support assembly includes four sets of multi-directional slide rails fixed to the inner wall of the chassis, circular plates symmetrically arranged in the chassis, an alloy spring fixed between two sets of circular plates, a connecting rod fixed to the bottom end of the circular plate, and a connecting sleeve rod movably sleeved on the connecting rod. The positioning assembly includes an electric push rod mounted on the chassis, a roller rotatably disposed at the bottom of the ultraviolet irradiation tube, and a pressure sensor embedded in the surface of the connecting rod.

[0008] Preferably, the multi-directional slide rail consists of a transverse slide rail and a longitudinal slide rail; Both the transverse and longitudinal slide rails are composed of tracks and sliders; One side of each of the four sets of transverse slide rails is fixedly connected to the inner wall of the chassis by fasteners. The two sides of each set of circular plates are rotatably connected to the sliders in each pair of longitudinal slide rails; Both the transverse and longitudinal slide rails are equipped with return springs inside. The two ends of the return spring are fixedly connected to the inner wall of the transverse slide rail and the surface of the slider in the longitudinal slide rail, respectively.

[0009] Preferably, the connecting rods are provided in two symmetrically distributed sets; The connecting rod is L-shaped.

[0010] Preferably, a fastener is movably inserted through one end of the connecting rod; The fastener consists of bolts and nuts; The connecting rod has through grooves on both sides that are adapted to the bolts, and the width of the grooves is smaller than the width of the nut. One end of the bolt moves through both the groove and the inside of one end of the connecting rod.

[0011] Preferably, the extended axis of the alloy spring always coincides with the extended axis of the two sets of annular plates; The extended axis of the annular plate coincides with the extended axis of the ultraviolet irradiation tube.

[0012] Preferably, the positioning assembly further includes a multi-directional rod hinged to the top of the ultraviolet irradiation tube; Both the electric push rod and the multi-directional rod are provided with two symmetrically distributed sets; The top of each set of multi-directional rods is hinged to the piston end of each set of electric push rods.

[0013] Preferably, both the pressure sensor and the roller are provided with two symmetrically distributed sets; The two sets of rollers are located at the bottom ends of the ultraviolet irradiation tube, respectively; The roller is composed of several groups of cylindrical tubes arranged in a linear array; Each set of rollers is always positioned directly above each set of pressure sensors.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In this invention, when the cable is inserted into the alloy spring, if the cable tilts slightly, the alloy spring will be deflected by the cable, and one end of the alloy spring will pull on one set of annular plates, causing that set of annular plates to also tilt. The other set of annular plates tilts synchronously with one set of annular plates via connecting rods and sleeve rods. Ultimately, the alloy spring and both sets of annular plates maintain the same tilt as the cable. When the cable passes through the middle of the alloy spring, the alloy spring provides a spiral and uniform wrapping around the cable, and it does not forcefully clamp or correct the insulation layer, unlike rigid point-contact compression clamping. The damage to the insulation layer caused by the alloy spring is minimal and negligible. After the sleeve rod tilts, the pressure sensor receives pressure from the ultraviolet irradiation tube that does not match the preset value. Therefore, the ultraviolet irradiation tube can be pushed and pulled again via an electric push rod until the pressure values ​​received by both sets of pressure sensors are equal and consistent with the preset value. At this point, the ultraviolet irradiation tube will also be at the same tilt angle as the cable, and the distance between the surface of the insulation layer inside the ultraviolet irradiation tube and the ultraviolet lamp inside the tube will be equal. This invention utilizes an alloy spring as a flexible sensing and actuation integrated element. The alloy spring forms a helical flexible line contact with the cable, resulting in uniform pressure distribution. This reduces damage such as indentations and scratches caused by rigid point-contact clamping to the insufficiently hard insulation layer. When the cable tilts, the alloy spring and the annular plate tilt in tandem, driving the ultraviolet irradiation tube to adaptively adjust to the same angle as the cable. Simultaneously, the inner diameter of the alloy spring is adjustable, allowing a single element to adapt to various cable specifications. This invention transforms the traditional "rigid point-contact correction" into "flexible compliant following," significantly reducing contact damage and stress risks. Furthermore, the tilt angle of the ultraviolet irradiation tube can be adjusted at any time to ensure its axis coincides with the cable, guaranteeing uniform irradiation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the chassis of the present invention.

[0017] Figure 3 This is a partial structural diagram of the present invention.

[0018] Figure 4 This is a schematic diagram of the annular plate and alloy spring structure of the present invention.

[0019] Figure 5 This is a schematic diagram of the multi-directional slide rail and return spring structure of the present invention.

[0020] Figure 6 This is a schematic diagram of the pressure sensor structure of the present invention.

[0021] Figure 7 This is a schematic diagram of the roller structure of the present invention.

[0022] Figure 8 For the present invention Figure 7 A magnified structural diagram of A in the diagram.

[0023] Figure 9 This is a front view of the structure in the initial state of the present invention.

[0024] Figure 10 This is a front view schematic diagram of the cable of the present invention in a tilted state.

[0025] Figure 11 This is a front view schematic diagram of the ultraviolet irradiation tube in the initial adjustment state of the present invention.

[0026] Figure 12 This is a front view of the ultraviolet irradiation tube of the present invention after adjustment.

[0027] In the diagram: 1. Chassis; 2. Electric actuator; 3. Multi-directional rod; 4. Ultraviolet irradiation tube; 5. Circular ring plate; 6. Connecting rod; 7. Connecting rod; 8. Alloy spring; 9. Pressure sensor; 10. Multi-directional slide rail; 11. Return spring; 12. Fastener; 13. Roller. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 12 The present invention provides a technical solution: a uniform irradiation device for cross-linking of cable insulation layer by irradiation, comprising a housing 1 and an ultraviolet irradiation cylinder 4 movably disposed within the housing 1, and further comprising: A flexible support component that adapts to the inclined trajectory of the cable is installed inside the chassis 1, and a positioning component that is installed at the top and bottom of the ultraviolet irradiation tube 4 to achieve adaptive attitude adjustment of the ultraviolet irradiation tube 4 to match the angle of the cable. In practical implementation, both ends of the casing 1 are provided with channel holes for feeding and discharging materials. In the initial state, the extended axis of the channel hole coincides with the extended axis of the annular plate 5. The diameters of the circular hole in the middle of the annular plate 5 and the channel holes must both be larger than the outer diameter of conventional cables to ensure that cables of various specifications can pass through freely even when tilted. In addition, the ultraviolet irradiation tube 4 consists of an outer protective shell and several groups of ultraviolet lamps evenly and densely distributed inside the protective shell. For the specific principle of ultraviolet irradiation crosslinking and related components, refer to existing mature technologies; this invention will not elaborate further here.

[0030] The flexible support assembly includes four sets of multi-directional slide rails 10 fixed to the inner wall of the chassis 1, circular ring plates 5 symmetrically arranged in the chassis 1, alloy springs 8 fixed between two sets of circular ring plates 5, connecting rods 7 fixed to the bottom of the circular ring plates 5, and connecting sleeve rods 6 movably sleeved on the connecting rods 7. The positioning assembly includes an electric push rod 2 mounted on the housing 1, a roller 13 rotatably disposed at the bottom of the ultraviolet irradiation tube 4, and a pressure sensor 9 embedded in the surface of the connecting rod 6.

[0031] The multi-directional slide rail 10 consists of a transverse slide rail and a longitudinal slide rail; Both the horizontal and vertical slide rails consist of tracks and sliders; One side of each of the four sets of transverse slide rails is fixedly connected to the inner wall of the chassis 1 by fasteners. The two sides of each set of circular plates 5 are rotatably connected to the sliders in each pair of longitudinal slide rails. In specific implementation, as shown in the appendix Figure 5 and attached Figure 10 As shown, the tilting base point of the cable is uncertain and may begin to tilt at any position on the left side of the chassis 1. Therefore, when the cable is inserted into the alloy spring 8 and the alloy spring 8 is deflected, in order to better follow the cable trajectory and avoid excessive pressure on the cable, the tilting base points of the two sets of annular plates 5 need to be consistent with the tilting base point of the cable. This means that the annular plates 5 will simultaneously experience different stroke displacements in the lateral and longitudinal directions, as well as deflections at different angles. Therefore, this invention utilizes multi-directional slide rails 10 to accommodate the different directional displacements of the annular plates 5. It should be noted that the slider in the lateral slide rail is fixedly connected to the track in the longitudinal slide rail, allowing the annular plates 5 to perform multi-directional displacements with different strokes while rotating, utilizing the longitudinal and lateral slide rails.

[0032] Both the transverse and longitudinal slide rails are equipped with return springs 11 inside; The two ends of the return spring 11 are fixedly connected to the inner wall of the transverse slide rail and the surface of the slider in the longitudinal slide rail, respectively.

[0033] In specific implementation, as shown in the appendix Figure 5As shown, each set of transverse and longitudinal slide rails is symmetrically equipped with two sets of return springs 11. The main function of the return springs 11 is to allow the annular plate 5 to return to its original position. The return springs 11 in the transverse slide rails keep the longitudinal slide rail in the middle, and the return springs 11 in the longitudinal slide rails keep the annular plate 5 in the middle, ensuring sufficient space for the annular plate 5 to move in any direction. It should be noted that even though the multi-directional slide rails 10 and the return springs 11 can only return the annular plate 5 to its original position and cannot restore the rotation angle of the annular plate 5 to its original position, the elasticity of the alloy springs 8 itself does not allow the extended axes of the two sets of annular plates 5 to be misaligned. The rebound of the alloy springs 8 will restore the angle of the two sets of annular plates 5 to its original position. Therefore, without the action of the cable, the two sets of annular plates 5 can return to their initial state. In addition, the return spring 11 needs to be able to support the weight of components such as the annular plate 5 and the connecting rod 6 to prevent the annular plate 5 from falling and losing its bottom movement space. Therefore, components such as the annular plate 5 and the connecting rod 6 can be made of lightweight materials to minimize the burden on the return spring 11. However, the return spring 11 cannot resist the bending force of the cable on the alloy spring 8 and the annular plate 5. Once the cable passes through the chassis 1 at an angle, the annular plate 5 and the alloy spring 8 will follow the angle of the cable. If the elastic force of the return spring 11 is too large, it will cause the displacement resistance of the annular plate 5 to be too large, which will eventually cause the alloy spring 8 to exert excessive reverse compression on the cable insulation layer, attempting to correct the cable.

[0034] The connecting rod 7 is provided with two symmetrically distributed sets; The connecting rod 7 is set in an L-shape.

[0035] In practice, the top end of the connecting rod 7 is fixedly connected to the bottom end of the annular plate 5, and the other end of the connecting rod 7 is movably inserted into the connecting sleeve rod 6. The dimensions of the connecting rod 7 and the connecting sleeve rod 6 are compatible, and the contact surfaces of both are polished and lubricated. The extension and retraction of the connecting sleeve rod 6 and the connecting rod 7 can be used to adjust the distance between the two sets of annular plates 5, that is, to adjust the extension and retraction length of the alloy spring 8, thereby changing the inner diameter of the alloy spring 8 to better match the outer diameter of the cable. At the same time, after the connecting sleeve rod 6 and the connecting rod 7 are fixed, it is equivalent to fixing the two sets of annular plates 5. After one end of the cable enters the interior of one end of the alloy spring 8 and tilts, the tilt state can be immediately transferred from one set of annular plates 5 to the other set of annular plates 5, so that the two sets of annular plates 5 will move and deflect together. In this way, the alloy spring 8 will also keep in line with the tilt trajectory of the cable at the first time and will not bend. Because once the alloy spring 8 is bent, it is very likely that the cable will not be able to move at the bend, or even the insulation layer will be scratched and damaged.

[0036] One end of the connecting rod 7 is movably inserted with a fastener 12; Fastener 12 consists of bolts and nuts; The connecting rod 6 has through grooves on both sides that are adapted to the bolts, and the width of the grooves is smaller than the width of the nut. One end of the bolt moves through both the slide groove and the inside of one end of the connecting rod 7.

[0037] In specific implementation, as shown in the appendix Figure 6 As shown, after the total extension length of the connecting rod 6 and the connecting rod 7 is adjusted, it can be locked by tightening the nut. The friction between the nut and the surface of the connecting rod 6 makes it difficult for the length of the connecting rod 7 and the connecting rod 6 to change. Anti-slip pads can also be installed between the nut and the surface of the connecting rod 6.

[0038] The extended axis of the alloy spring 8 always coincides with the extended axis of the two sets of annular plates 5; The extended axis of the annular plate 5 coincides with the extended axis of the ultraviolet irradiation tube 4.

[0039] In specific implementation, as shown in the appendix Figure 9 and attached Figure 10 As shown, the alloy spring 8 and the annular plate 5 are tilted together to follow the cable's trajectory, forming a unified rectangular frame. Regardless of which point is used as the base for rotation, it remains a rectangle and will not become a rhombus. This ensures that the angle between the two sets of pressure sensors 9 is also consistent with the cable trajectory, facilitating the alignment of the ultraviolet irradiation tube 4 with the axis of the annular plate 5 and the alloy spring 8. It is important to note that the alloy spring 8 must be made of materials including, but not limited to, nickel-titanium alloys. With specific parameters such as the helix angle, the inner diameter can be reduced during stretching and increased during compression. Specific parameters and materials can be selected according to requirements.

[0040] The positioning assembly also includes a multi-directional rod 3 that is hinged to the top of the ultraviolet irradiation tube 4; Both the electric push rod 2 and the multi-direction rod 3 are equipped with two sets of symmetrically distributed components; The top of each set of multi-directional rods 3 is hinged to the piston end of each set of electric push rods 2.

[0041] In specific implementation, as shown in the appendix Figure 12 As shown, the piston end of the electric push rod 2 moves vertically, while the ultraviolet irradiation tube 4 not only needs to move vertically but also needs to tilt. Therefore, through the connection of the multi-directional rod 3, the piston end of the electric push rod 2 can be kept in a vertically descending state to achieve the downward movement and tilting of the ultraviolet irradiation tube 4.

[0042] Both the pressure sensor 9 and the roller 13 are provided with two sets of symmetrically distributed pressure sensors; The two sets of rollers 13 are located at the bottom ends of the ultraviolet irradiation tube 4, respectively; The roller 13 is composed of several groups of cylindrical tubes arranged in a linear array. Each set of rollers 13 is always positioned directly above each set of pressure sensors 9.

[0043] In practice, two sets of pressure sensors 9 sense the gravity transmitted from the two sets of rollers 13. When the ultraviolet irradiation tube 4 moves vertically downwards, the outermost cylindrical section of one set of rollers 13 will inevitably contact the pressure sensor 9 first. After the gravity sensed by the corresponding set of pressure sensors 9 reaches a preset value, the corresponding set of electric push rods 2 stops advancing the ultraviolet irradiation tube 4. At this time, it is in the position shown in the attached figure. Figure 11 As shown in the diagram, the other set of rollers 13 has not yet come into contact with the other set of pressure sensors 9, or in other words, the other set of pressure sensors 9 has not yet received sufficient pressure. Therefore, the other set of electric push rods 2 continues to push the ultraviolet irradiation tube 4. At this time, the height position of one end of the ultraviolet irradiation tube 4 remains unchanged, while the other end is pushed down. The ultraviolet irradiation tube 4 will then rotate around the bottom hinge point of one set of multi-directional rods 3. This will cause one set of pressure sensors 9 to gradually disengage from one set of rollers 13. One set of electric push rods 2 will then start pushing the ultraviolet irradiation tube 4 down again until the pressure exerted by one set of rollers 13 on one set of pressure sensors 9 reaches the preset value. This process is repeated until the tilt angle of the ultraviolet irradiation tube 4 is consistent with that of the connecting rod 6, and the pressure exerted by the two sets of rollers 13 on the two sets of pressure sensors 9 is equal and reaches the preset value of the pressure sensors 9. Only then will the two sets of electric push rods 2 truly stop pushing. Rollers 13 can reduce the friction between the ultraviolet irradiation tube 4 and the pressure sensors 9. It should be noted that the pressure sensor 9 can transmit the received pressure signal to the central processing unit in real time. The central processing unit analyzes the data and sends commands to the electric actuators 2 to control the start and stop of the two sets of electric actuators 2. This is a mature existing technology, and the present invention will not elaborate on it in detail here. The adjustment time of the ultraviolet irradiation tube 4 is very fast. It is not moved slowly. Basically, as soon as the connecting rod 6 tilts and the two sets of pressure sensors 9 are subjected to uneven force, the two sets of electric actuators 2 are immediately activated. Therefore, it will not affect the irradiation uniformity of the cable insulation layer too much. In addition, it should be emphasized that not the entire weight of the ultraviolet irradiation tube 4 is pressed on the pressure sensor 9. Only a slight weight is needed. This weight is enough for the pressure sensor 9 to detect, but it cannot resist the elastic force of the return spring 11. That is, even if a small part of the weight of the ultraviolet irradiation tube 4 is pressed on the pressure sensor 9, it will not easily cause the return spring 11 to be stretched or compressed. However, straightening the tilt of the cable itself requires a large force, which is sufficient to stretch or compress the return spring 11.

[0044] Working principle: When using the uniform irradiation device for cross-linking of cable insulation, first stretch the connecting rod 6 and the connecting rod 7 to a suitable length so that the inner diameter of the alloy spring 8 matches the outer diameter of the insulation layer, and lock the connecting rod 6 and the connecting rod 7 with the fastener 12. After the cable and insulation layer come out of the front end equipment, it is generally necessary to manually remove the excess insulation layer at the end. At this step, the cable end can be manually assisted to enter the alloy spring 8. The cable continues to pass through the middle of the alloy spring 8, and the insulation layer on its surface is uniformly irradiated by the ultraviolet lamp in the ultraviolet irradiation tube 4. If the cable tilts, taking a downward tilt as an example, the cable will deflect the alloy spring 8 and the annular plate 5. The annular plate 5 will move and rotate in different directions using the multi-directional slide rail 10 and the return spring 11. The extended axes of the alloy spring 8, the annular plate 5, and the cable will all coincide. The two sets of pressure sensors 9 will sense the pressure imbalance and that it is less than the preset value. They will immediately drive the electric push rod 2, which will push the ultraviolet irradiation tube 4 downward. The pressure value sensed by the pressure sensor 9 will determine the start and stop of the two sets of electric push rods 2 in real time. Finally, the ultraviolet irradiation tube 4 will be pushed to a state parallel to the connecting rod 6. The axis of the ultraviolet irradiation tube 4 and the part of the cable inside it will coincide. The cable inside the ultraviolet irradiation tube 4 can be uniformly irradiated by ultraviolet rays.

[0045] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A uniform irradiation device for crosslinking cable insulation, comprising a housing (1) and an ultraviolet irradiation tube (4) movably disposed within the housing (1), characterized in that, Also includes: A flexible support component that adapts to the inclined trajectory of the cable is installed inside the chassis (1), and a positioning component that is installed above and below the ultraviolet irradiation tube (4) to achieve adaptive attitude adjustment of the ultraviolet irradiation tube (4) to match the angle of the cable. The flexible support assembly includes four sets of multi-directional slide rails (10) fixed to the inner wall of the chassis (1), circular ring plates (5) symmetrically arranged in the chassis (1), alloy springs (8) fixed between the two sets of circular ring plates (5), connecting rods (7) fixed to the bottom of the circular ring plates (5), and connecting sleeve rods (6) movably sleeved on the connecting rods (7). The positioning assembly includes an electric push rod (2) mounted on the housing (1), a roller (13) rotatably disposed at the bottom of the ultraviolet irradiation tube (4), and a pressure sensor (9) embedded in the surface of the connecting rod (6).

2. The uniform irradiation device for cross-linking cable insulation layer according to claim 1, characterized in that: The multi-directional slide rail (10) consists of a transverse slide rail and a longitudinal slide rail; Both the transverse and longitudinal slide rails are composed of tracks and sliders; One side of each of the four sets of transverse slide rails is fixedly connected to the inner wall of the chassis (1) by fasteners. The two sides of each set of circular plates (5) are rotatably connected to the sliders in each pair of longitudinal slide rails; Both the transverse and longitudinal slide rails are equipped with return springs (11). The two ends of the return spring (11) are fixedly connected to the inner wall of the transverse slide rail and the surface of the slider in the longitudinal slide rail, respectively.

3. The uniform irradiation device for cross-linking cable insulation layer according to claim 1, characterized in that: The connecting rod (7) is provided with two symmetrically distributed sets; The connecting rod (7) is L-shaped.

4. The uniform irradiation device for cross-linking cable insulation layer according to claim 1, characterized in that: One end of the connecting rod (7) is movably inserted with a fastener (12); The fastener (12) consists of a bolt and a nut; The connecting rod (6) has through grooves on both sides that are adapted to the bolts, and the width of the grooves is smaller than the width of the nut. One end of the bolt moves through both the groove and the inside of one end of the connecting rod (7).

5. The uniform irradiation device for cross-linking of cable insulation layer according to claim 1, characterized in that: The extended axis of the alloy spring (8) always coincides with the extended axis of the two sets of annular plates (5); The extended axis of the annular plate (5) coincides with the extended axis of the ultraviolet irradiation tube (4).

6. The uniform irradiation device for cross-linking of cable insulation layer according to claim 1, characterized in that: The positioning assembly also includes a multi-directional rod (3) hinged to the top of the ultraviolet irradiation tube (4); Both the electric push rod (2) and the multi-directional rod (3) are provided with two sets of symmetrically distributed components; The top of each set of multi-directional rods (3) is hinged to the piston end of each set of electric push rods (2).

7. The uniform irradiation device for cross-linking cable insulation layer according to claim 1, characterized in that: The pressure sensor (9) and the roller (13) are both provided with two symmetrically distributed sets; The two sets of rollers (13) are located at the bottom ends of the ultraviolet irradiation tube (4); The roller (13) is composed of several groups of cylindrical tubes arranged in a linear array; Each set of rollers (13) is always positioned directly above each set of pressure sensors (9).

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