Photovoltaic flexible inhaul cable extension construction method

Abstract

The invention discloses a photovoltaic flexible inhaul cable extension construction method, belongs to the technical field of inhaul cable extension, and solves the technical problems of inhaul cable extension and anchoring in the state of a photovoltaic inhaul cable with force. The construction method comprises the steps that after a photovoltaic panel of the photovoltaic flexible inhaul cable is dismantled, the cable clamp is installed, the tensioning tool is installed, and the tensioning tool is connected with the tensioning device; the tensioning tool is tensioned through the tensioning device, and after the photovoltaic flexible inhaul cable is completely loosened, positioning and cable cutting are conducted; an extrusion connecting sleeve mechanism is manufactured on the photovoltaic flexible inhaul cable, and correspondingly, an extrusion connecting sleeve mechanism is manufactured on the extension inhaul cable; the extrusion connecting sleeve mechanism is subjected to preservative treatment; the photovoltaic flexible inhaul cable is connected with an extrusion connecting sleeve mechanism of the extension inhaul cable through a connecting sleeve; the lengthened inhaul cable penetrates through the anchoring seat; and after the tensioning jack tensions the extension inhaul cable to the designed tensioning force, the extension inhaul cable is anchored on the anchoring seat through the anchoring mechanism. The integrated operation of lengthening and anchoring of the inhaul cable under the force state is achieved, and the construction efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable splicing, and more specifically, it relates to a construction method for splicing flexible photovoltaic cables. Background Art

[0002] The existing steel strand splicing technology has the following problems:

[0003] Insufficient connection reliability: Traditional steel strand splicing methods mostly use wedge anchors, bolt connections or simple mechanical fixings, which are prone to loosening, have poor sealing performance, and are easily corroded when exposed to the outdoor environment for a long time, affecting the structural safety.

[0004] Moreover, there is currently no construction method for splicing and anchoring photovoltaic cables under the condition of the cable being under tension. Summary of the Invention

[0005] The technical problem to be solved by the present invention is in view of the above deficiencies of the prior art. The object of the present invention is to provide a construction method for splicing flexible photovoltaic cables, which can realize the splicing and anchoring construction of photovoltaic cables under the condition of the cable being under tension.

[0006] The technical solution of the present invention is: A construction method for splicing flexible photovoltaic cables, including the following steps:

[0007] Step 1. After removing the photovoltaic panels near the anchor block on the flexible photovoltaic cable, install a cable clamp on the flexible photovoltaic cable, and install a tensioning tooling on the side of the cable clamp away from the anchor block, and then connect the tensioning tooling to a tensioning device;

[0008] Step 2. Tension the tensioning tooling through the tensioning device until the flexible photovoltaic cable near the anchor block end is completely relaxed, then position it according to the process requirements and cut the cable;

[0009] Step 3. Fabricate an extrusion connection sleeve mechanism at the cut end of the flexible photovoltaic cable, and correspondingly, fabricate an extrusion connection sleeve mechanism at one end of the spliced cable;

[0010] Step 4. Perform anti-corrosion treatment on the extrusion connection sleeve mechanism;

[0011] Step 5. Connect the extrusion connection sleeve mechanism of the flexible photovoltaic cable and the extrusion connection sleeve mechanism of the spliced cable through a connection sleeve to complete the cable splicing;

[0012] Step 6. Pass the other end of the spliced cable through the anchor block and install an anchoring mechanism;

[0013] Step 7. After tensioning the spliced cable to the set value through a tensioning jack, remove the tensioning device, tensioning tooling and cable clamp;

[0014] Step 8. After the tensioning jack continues to tension the spliced cable to the designed tensile force, the spliced cable is anchored to the anchor seat through the anchoring mechanism, the tensioning jack is unloaded and removed, and the tensioning process is completed.

[0015] As a further improvement, step 1 includes:

[0016] Step 11. Install the first cable clamp, and it is required that each cable clamp bolt of the first cable clamp be tightened with a torque wrench to a torque above the set torque;

[0017] Step 12. Install the second cable clamp. After pre-tightening the cable clamp bolts of the second cable clamp, install the tensioning tooling behind the second cable clamp, and the tensioning tooling is connected to the tensioning device through a connecting piece;

[0018] Step 13. The tensioning device tensions at least the set tensile force. After the first cable clamp and the second cable clamp are in close contact, each cable clamp bolt of the second cable clamp is tightened with a torque wrench to a torque above the set torque.

[0019] Further, the process of manufacturing the extrusion connection sleeve mechanism in step 3 includes:

[0020] Step 31. Screw the extrusion spring into the position on the photovoltaic flexible cable or the spliced cable that needs to be extruded;

[0021] Step 32. Squeeze the sealant into the inner hole of the extrusion connection sleeve;

[0022] Step 33. Pass the end of the photovoltaic flexible cable or the spliced cable with the extrusion spring through the extrusion die of the extruder and into the extrusion connection sleeve;

[0023] Step 34. Operate the oil pump to supply pressure oil to the extruder, and the piston of the extruder extends to drive the pressing head of the extruder to press the extrusion connection sleeve towards the extrusion die;

[0024] Step 35. After the pressing head presses in place, operate the oil pump to retract the piston;

[0025] Step 36. After the piston retracts in place, remove the extruder to complete the manufacture of the extrusion connection sleeve mechanism.

[0026] Further, the anti-corrosion treatment in step 4 is specifically:

[0027] Clean the grease and impurities on the surface of the extrusion connection sleeve;

[0028] Apply sealing wax at the transition between the extrusion connection sleeve and the photovoltaic flexible cable or the spliced cable;

[0029] After the sealing wax solidifies, install a heat shrinkable sleeve which completely wraps the sealing wax.

[0030] Further, in step 5, the connecting sleeve and the extrusion connecting sleeve mechanism of the extrusion connecting sleeve are connected by threads.

[0031] Further, the anchoring mechanism includes an anchor plate and wedge grips. The extended cable passes through the tapered hole of the anchor plate of the anchor plate and is clamped in the tapered hole of the anchor plate by the wedge grips.

[0032] Further, the tensioning device is a chain block or an electric hoist or a jack.

[0033] Further, it also includes:

[0034] Step 9. Fabricate an extrusion sleeve assembly at the anchored end of the extended cable;

[0035] Step 10. Cut off the redundant cable at the tensioning end of the extended cable, and require the length of the extended cable exposed from the extrusion sleeve assembly to be within a set range;

[0036] Step 11. Perform anti-corrosion treatment on the extrusion sleeve assembly.

[0037] Further, the process of fabricating the extrusion sleeve assembly in step 9 includes:

[0038] Step 91. Screw the extrusion spring onto the position of the extended cable that needs to be extruded;

[0039] Step 92. Pass the end of the extended cable with the extrusion spring through the extrusion die, support cylinder, extrusion sleeve of the extruder in sequence, and insert it into the hole of the top pressure head of the extruder;

[0040] Step 93. Operate the oil pump to supply pressure oil to the extruder, and the piston of the extruder extends to drive the top pressure head to extrude the extrusion sleeve towards the extrusion die;

[0041] Step 94. After the top pressure head reaches the top pressure position, operate the oil pump to make the piston return;

[0042] Step 95. After the piston returns to the position, remove the extruder to complete the fabrication of the extrusion sleeve assembly.

[0043] Further, the anti-corrosion treatment in step 11 specifically is:

[0044] Clean the grease and impurities on the surface of the extrusion sleeve;

[0045] Apply sealing wax at the transition between the extrusion sleeve and the extended cable;

[0046] After the sealing wax solidifies, a heat shrinkable sleeve is installed, and the heat shrinkable sleeve completely wraps the sealing wax and the cable exposed from the extrusion sleeve assembly.

[0047] Advantages

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] 1. The present invention can improve the connection reliability: By using the extrusion connection sleeve and the sealing wax, the loosening and corrosion of the extended part of the cable are effectively prevented, and the safety and durability of the structure are improved.

[0050] 2. The present invention can improve the construction efficiency: After the photovoltaic flexible cable is completely relaxed by the tensioning device to tension the tensioning tooling, positioning and cable cutting are carried out, and then the extruder and the tensioning jack are used to realize the integrated operation of extending and anchoring the cable under the force-bearing state, improving the construction efficiency and quality.

[0051] 3. The present invention can ensure the construction accuracy: Through precise tensioning and extrusion control, the tensile force and extrusion amount of the extended part are ensured to meet the design requirements, improving the construction accuracy. Brief Description of the Drawings

[0052] Figure 1 is a schematic structural diagram of the present invention after extension;

[0053] Figure 2 is a schematic structural diagram of the cable clamp and the tensioning tooling in the present invention;

[0054] Figure 3 is a schematic structural diagram of the tensioning tooling in the present invention;

[0055] Figure 4 is a schematic diagram of the mechanism for manufacturing the extrusion connection sleeve in the present invention;

[0056] Figure 5 is a schematic structural diagram of the extrusion connection sleeve mechanism in the present invention;

[0057] Figure 6 is a schematic diagram of the anti-corrosion treatment of the extrusion connection sleeve mechanism in the present invention;

[0058] Figure 7 is a schematic structural diagram of the connection between the photovoltaic flexible cable and the extended cable in the present invention;

[0059] Figure 8 is a schematic structural diagram of the anchoring of the extended cable in the present invention;

[0060] Figure 9 is a schematic diagram of the manufacturing of the extrusion sleeve assembly in the present invention;

[0061] Figure 10Schematic diagram of the anti-corrosion treatment of the extrusion sleeve assembly in the present invention;

[0062] Figure 11 is Figure 10 the enlarged view of part A in

[0063] Wherein: 1 - photovoltaic flexible cable, 2 - anchoring seat, 3 - cable clamp, 4 - tensioning tooling, 5 - extrusion connection sleeve mechanism, 6 - extended cable, 7 - connection sleeve, 8 - anchoring mechanism, 9 - extrusion spring, 10 - extrusion connection sleeve, 11 - extruder, 12 - extrusion die, 13 - piston, 14 - pressing head, 15 - sealing wax, 16 - heat shrinkable sleeve, 17 - anchor plate, 18 - wedge, 19 - extrusion sleeve assembly, 20 - support cylinder, 21 - extrusion sleeve, 22 - cable clamp bolt, 23 - tensioning connection hole, 24 - first buckle plate, 25 - second buckle plate, 26 - hinge bolt, 27 - fastening bolt, 28 - fastening groove, 29 - cable through hole, 30 - hinge nut. Specific embodiments

[0064] The present invention will be further described below with reference to specific embodiments in the drawings.

[0065] Refer to Figures 1 to 11 , a construction method for extending a photovoltaic flexible cable, comprising the following steps:

[0066] Step 1. After removing the photovoltaic panels near the anchoring seat 2 on the photovoltaic flexible cable 1 (only a small part of the photovoltaic panels need to be removed), install a cable clamp 3 on the photovoltaic flexible cable 1, and install tensioning tooling 4 on the side of the cable clamp 3 away from the anchoring seat 2, and then connect the tensioning tooling 4 with a tensioning device;

[0067] Step 2. Tension the tensioning tooling 4 through the tensioning device until the photovoltaic flexible cable 1 at one end close to the anchoring seat 2 is completely relaxed, then position it according to process requirements and cut the cable;

[0068] Step 3. Fabricate an extrusion connection sleeve mechanism 5 at the cut end of the photovoltaic flexible cable 1, and correspondingly, fabricate an extrusion connection sleeve mechanism 5 at one end of the extended cable 6; in this embodiment, both the photovoltaic flexible cable 1 and the extended cable 6 are steel strands;

[0069] Step 4. Perform anti-corrosion treatment on the extrusion connection sleeve mechanism 5;

[0070] Step 5. Connect the extrusion connection sleeve mechanism 5 of the photovoltaic flexible cable 1 and the extrusion connection sleeve mechanism 5 of the extended cable 6 through a connection sleeve 7 to complete the cable extension;

[0071] Step 6. Pass the other end of the extended cable 6 through the anchoring seat 2 and install an anchoring mechanism 8;

[0072] Step 7. After the extended cable 6 is tensioned by the tensioning jack to the set value, remove the tensioning device, the tensioning tooling 4, and the cable clamp 3.

[0073] Step 8. After the tensioning jack continues to tension the extended cable 6 to the design tensile force, anchor the extended cable 6 on the anchor seat 2 through the anchoring mechanism 8. The tensioning jack is unloaded and removed, completing the tensioning process. It is required that the exposed amount of the extended cable 6 relative to the pressure-bearing surface of the tensioning end of the anchor seat 2 after installation is not less than 250 mm.

[0074] Specifically, in Step 1, it includes:

[0075] Step 11. Install the first cable clamp 3. It is required that each cable clamp bolt 22 of the first cable clamp 3 needs to be tightened with a torque wrench to a torque above the set value. In this embodiment, the set torque is 100 N·M. The torque wrench can be a pointer-type torque wrench, with a specification of 0 - 300 N·M.

[0076] Step 12. Install the second cable clamp 3. After pre-tightening the cable clamp bolts 22 of the second cable clamp 3, install the tensioning tooling 4 behind the second cable clamp 3. The tensioning tooling 4 is connected to the tensioning device through a connecting piece. The tensioning device can be a manual hoist, an electric hoist, or a jack. The connecting piece can be a steel wire rope or a connecting rod, and the connecting piece is connected to the tensioning connection hole 23 of the tensioning tooling 4.

[0077] Step 13. The tensioning device tensions at least the set tensile force. The set tensile force is 10 KN, so that the first cable clamp 3 and the second cable clamp 3 are tightly attached. For example, when using a manual hoist to pull with a force of at least 10 KN to make the two cable clamps 3 tightly attached, use a torque wrench to tighten each cable clamp bolt 22 of the second cable clamp 3 to a torque above the set value. By using two cable clamps 3, the stability during tensioning can be greatly improved, and it can prevent damage to the photovoltaic flexible cable 1 due to excessive clamping force used by the cable clamp 3.

[0078] The tensioning tooling 4 is as Figure 3 shown, including a first buckle plate 24 and a second buckle plate 25. One ends of the first buckle plate 24 and the second buckle plate 25 are rotatably connected through a hinge bolt 26 and locked by a hinge nut 30. The other end of the first buckle plate 24 is provided with a fastening bolt 27, and the other end of the second buckle plate 25 is provided with a fastening groove 28. The fastening bolt 27 is buckled in the fastening groove 28 and locked by a fastening nut. A cable through-hole 29 is provided between the middle parts of the first buckle plate 24 and the second buckle plate 25 for passing through the photovoltaic flexible cable 1. Two tensioning connection holes 23 are respectively located on both sides of the cable through-hole 29.

[0079] In Step 3, the process of manufacturing the extrusion connection sleeve mechanism 5 includes:

[0080] Step 31. Slowly screw the extrusion spring 9 onto the position on the photovoltaic flexible cable 1 or the extension cable 6 that needs to be extruded; in this embodiment, there are 2 extrusion springs 9, each about 60 mm long. Make them close together by hand and then screw them tightly, so that they are tightly wrapped around the photovoltaic flexible cable 1. Note: During the installation of the extrusion spring, breakage and fragmentation should be avoided;

[0081] Step 32. Squeeze 10 mL of sealing structural adhesive into the inner hole of the extrusion connecting sleeve 10; the extrusion connecting sleeve 10 has a structure with one end closed and the other end open, and the outer wall of the closed end is provided with an external thread;

[0082] Step 33. Pass the end of the photovoltaic flexible cable 1 or the extension cable 6 with the extrusion spring 9 through the extrusion die 12 of the extruder 11 and then into the extrusion connecting sleeve 10, as Figure 4 shown; during installation, it is necessary to ensure that there is an extrusion spring 9 throughout the entire length of the extrusion connecting sleeve 10, and the exposed length of the extrusion spring 9 should not exceed 15 mm, as Figure 5 shown;

[0083] Step 34. Operate the oil pump to supply pressure oil to the extruder 11. The piston 13 of the extruder 11 extends to drive the pressing head 14 of the extruder 11 (here, the pressing head 14 uses a solid pressing head) to press the extrusion connecting sleeve 10 towards the extrusion die 12; it should be noted that: first pre-tighten the extrusion connecting sleeve 10, and then straighten and align it; there should be no pause during the extrusion process and it should be completed in one go; observe the oil pressure of the pressure gauge during extrusion, and the extrusion oil pressure should not exceed 50 MPa (corresponding to an extrusion force not exceeding 412 KN);

[0084] Step 35. After the pressing head 14 presses in place, operate the oil pump to make the piston 13 return;

[0085] Step 36. After the piston 13 returns in place, remove the extruder 11 to complete the production of the extrusion connecting sleeve mechanism 5.

[0086] As Figure 6 shown, the specific anti-corrosion treatment in Step 4 is as follows:

[0087] Clean the grease and impurities on the surface of the extrusion connecting sleeve 10;

[0088] Apply sealing wax 15 at the transition between the extrusion connecting sleeve 10 and the photovoltaic flexible cable 1 or the extension cable 6;

[0089] After the sealing wax 15 solidifies, install the heat shrinkable sleeve 16. The heat shrinkable sleeve 16 completely wraps the sealing wax 15 (the heat shrinkable sleeve 16 can be pre-sleeved on the photovoltaic flexible cable 1 or the extension cable 6 before extrusion), and the length of the heat shrinkable sleeve 16 is not less than 170 mm.

[0090] As Figure 7As shown, in step 5, the connecting sleeve 7 is threadedly connected to the extrusion connecting sleeve 10 of the extrusion connecting sleeve mechanism 5, that is, the external thread of the extrusion connecting sleeve 10 is in mating connection with the internal thread of the connecting sleeve 7, and it is required that the threads of the connecting sleeve 7 are all tightened.

[0091] The anchoring mechanism 8 includes an anchor plate 17 and wedge grips 18. The extended stay cable 6 passes through the tapered hole of the anchor plate 17 of the anchor plate and is clamped in the tapered hole of the anchor plate by the wedge grips 18. Before use, the anchor and the wedge grips must not rust; before use, the surfaces of the anchor, the wedge grips and the steel strand clamping surfaces should be kept clean without water stains, sediment and other impurities; after anchoring, the top surfaces of the wedge grips should be flush, and the misalignment between them should not be greater than 2 mm; after anchoring, the height of the wedge grips protruding outside the anchor plate should not be greater than 4 mm.

[0092] Furthermore, this construction method further includes:

[0093] Step 9. Fabricate an extrusion sleeve assembly 19 at one end of the extended stay cable 6 where it is anchored;

[0094] Step 10. Cut off the excess stay cable at the tensioning end of the extended stay cable 6, and it is required that the length of the extended stay cable 6 protruding from the extrusion sleeve assembly 19 is within a set range; the set range is 10 - 20 mm;

[0095] Step 11. Perform anti-corrosion treatment on the extrusion sleeve assembly 19.

[0096] As Figure 9 shown, the process of fabricating the extrusion sleeve assembly 19 in step 9 includes:

[0097] Step 91. Slowly screw the extrusion spring 9 onto the position of the extended stay cable 6 that needs to be extruded; make it tight by hand while screwing, and tightly wrap it around the steel strand. Note: During the installation of the extrusion spring, breakage and fragmentation should be avoided;

[0098] Step 92. Pass one end of the extended stay cable 6 with the extrusion spring 9 through the extrusion die 12, the support cylinder 20, and the extrusion sleeve 21 of the extruder 11 in sequence, and insert it into the hole of the top pressure head 14 of the extruder 11 (here the top pressure head 14 uses a through-hole top pressure head); during installation, it is necessary to ensure that there is an extrusion spring throughout the entire length of the extrusion sleeve 21;

[0099] Step 93. Operate the oil pump to supply pressure oil to the extruder 11, and the piston 13 of the extruder 11 extends to drive the top pressure head 14 to extrude the extrusion sleeve 21 towards the extrusion die 12; it should be noted that: first pre-tighten the extrusion sleeve 21, then straighten and align it. During the extrusion process, there should be no intermediate pauses and it should be completed in one go. Observe the oil pressure of the pressure gauge during extrusion, and the extrusion oil pressure does not exceed 50 MPa (corresponding to an extrusion force not exceeding 412 KN);

[0100] Step 94. After the top pressure head 14 reaches the top pressure position, operate the oil pump to retract the piston 13;

[0101] Step 95. After the piston 13 returns to its in-place position during the return stroke, remove the extruder 11 to complete the fabrication of the extrusion sleeve assembly 19.

[0102] As Figure 10 shown, the specific anti-corrosion treatment in Step 11 is as follows:

[0103] Clean the grease and impurities on the surface of the extrusion sleeve 21;

[0104] Apply sealing wax 15 at the transition between the extrusion sleeve 21 and the extension cable 6;

[0105] After the sealing wax 15 solidifies, install the heat shrinkable sleeve 16. The heat shrinkable sleeve 16 completely wraps the sealing wax 15 and the cable exposed from the extrusion sleeve assembly 19. That is, it is required that the heat shrinkable sleeve completely wraps the extrusion sleeve and the exposed steel strands, and the length of the heat shrinkable sleeve is not less than 110 mm.

[0106] The above is only the preferred embodiment of the present invention. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A construction method for lengthening a flexible cable of a photovoltaic system, characterized in that, The steps include: Step 1. After removing the photovoltaic panel on the photovoltaic flexible cable (1) near the anchoring seat (2), install a cable clamp (3) on the photovoltaic flexible cable (1), install a tensioning tooling (4) on the side of the cable clamp (3) away from the anchoring seat (2), and then connect the tensioning tooling (4) to a tensioning device; Step 2. Tension the tensioning tooling (4) through the tensioning device until the photovoltaic flexible cable (1) at one end near the anchoring seat (2) is completely relaxed, then position it according to the process requirements and cut the cable; Step 3. Fabricate an extrusion connection sleeve mechanism (5) at the cut end of the photovoltaic flexible cable (1), and correspondingly, fabricate an extrusion connection sleeve mechanism (5) at one end of the extended cable (6); Step 4. Perform anti-corrosion treatment on the extrusion connection sleeve mechanism (5); Step 5. Connect the extrusion connection sleeve mechanism (5) of the photovoltaic flexible cable (1) and the extrusion connection sleeve mechanism (5) of the extended cable (6) through a connection sleeve (7) to complete the cable extension; Step 6. Pass the other end of the extended cable (6) through the anchoring seat (2) and install an anchoring mechanism (8); Step 7. After tensioning the extended cable (6) to a set value by a tensioning jack, remove the tensioning device, tensioning tooling (4) and cable clamp (3); Step 8. After the tensioning jack continues to tension the extended cable (6) to the design tensile force, anchor the extended cable (6) in the anchoring seat (2) through the anchoring mechanism (8), unload the tensioning jack and remove it to complete the tensioning process.

2. The method for lengthening a photovoltaic flexible cable according to claim 1, wherein In Step 1, it includes: Step 11. Install the first cable clamp (3), and it is required that each cable clamp bolt (22) of the first cable clamp (3) be tightened with a torque wrench to a torque above the set value; Step 12. Install the second cable clamp (3), after pre-tightening the cable clamp bolts (22) of the second cable clamp (3), install the tensioning tooling (4) behind the second cable clamp (3), and the tensioning tooling (4) is connected to the tensioning device through a connecting piece; Step 13. The tensioning device at least tensions to the set tensile force, after the first cable clamp (3) and the second cable clamp (3) are in close contact, use a torque wrench to tighten each cable clamp bolt (22) of the second cable clamp (3) to a torque above the set value.

3. A photovoltaic flexible cable extension construction method according to claim 1, characterized in that, In the process of fabricating the extrusion connection sleeve mechanism (5) in Step 3, it includes: Step 31. Screw the extrusion spring (9) into the position on the photovoltaic flexible cable (1) or extended cable (6) that needs to be extruded; Step 32. Squeeze sealing structural adhesive into the inner hole of the extrusion connection sleeve (10); Step 33. Pass the end of the photovoltaic flexible cable (1) or extended cable (6) with the extrusion spring (9) through the extrusion die (12) of the extruder (11) and insert it into the extrusion connection sleeve (10); Step 34. Operate the oil pump to supply pressure oil to the extruder (11), and the piston (13) of the extruder (11) extends to drive the pressing head (14) of the extruder (11) to press the extrusion connection sleeve (10) towards the extrusion die (12); Step 35. After the top pressing head (14) presses in place, operate the oil pump to retract the piston (13). Step 36. After the piston (13) retracts in place, remove the extruder (11) to complete the fabrication of the extrusion connection sleeve mechanism (5).

4. A method for lengthening a photovoltaic flexible cable according to claim 3, characterized in that, In step 4, the anti-corrosion treatment is specifically as follows: Clean the grease and impurities on the surface of the extrusion connection sleeve (10). Apply sealing wax (15) at the transition between the extrusion connection sleeve (10) and the photovoltaic flexible cable (1) or the extended cable (6). After the sealing wax (15) solidifies, install a heat shrinkable sleeve (16), and the heat shrinkable sleeve (16) completely wraps the sealing wax (15).

5. A method for lengthening a photovoltaic flexible cable connection in construction according to claim 3, characterized in that, In step 5, the connection sleeve (7) and the extrusion connection sleeve (10) of the extrusion connection sleeve mechanism (5) are threadedly connected.

6. A photovoltaic flexible cable lengthening construction method according to claim 1, characterized in that, The anchoring mechanism (8) includes an anchor plate (17) and wedge grips (18). The extended cable (6) passes through the tapered hole of the anchor plate of the anchor plate (17) and is clamped in the tapered hole of the anchor plate by the wedge grips (18).

7. A photovoltaic flexible cable lengthening construction method according to claim 1, characterized in that The tensioning device is a chain block or an electric hoist or a jack.

8. A photovoltaic flexible cable lengthening construction method according to any one of claims 1-7, characterized in that, It also includes: Step 9. Fabricate an extrusion sleeve assembly (19) at the anchored end of the extended cable (6). Step 10. Cut off the excess cable at the tensioning end of the extended cable (6), and require that the length of the extended cable (6) exposed from the extrusion sleeve assembly (19) is within a set range. Step 11. Perform anti-corrosion treatment on the extrusion sleeve assembly (19).

9. A method for lengthening a photovoltaic flexible cable joint according to claim 8, characterized in that, In step 9, the process of fabricating the extrusion sleeve assembly (19) includes: Step 91. Screw the extrusion spring (9) onto the position of the extended cable (6) that needs to be extruded. Step 92. Insert one end of the extended cable (6) with the extrusion spring (9) through the extrusion die (12), support cylinder (20), and extrusion sleeve (21) of the extruder (11) in sequence, and insert it into the hole of the top pressing head (14) of the extruder (11). Step 93. Operate the oil pump to supply pressure oil to the extruder (11), and the piston (13) of the extruder (11) extends to drive the top pressing head (14) to press the extrusion sleeve (21) against the extrusion die (12). Step 94. After the top pressing head (14) presses in place, operate the oil pump to retract the piston (13). Step 95. After the piston (13) retracts in place, remove the extruder (11) to complete the fabrication of the extrusion sleeve assembly (19).

10. A photovoltaic flexible cable lengthening construction method according to claim 8, characterized in that, In step 11, the anti-corrosion treatment is specifically as follows: Clean the grease and impurities on the surface of the extrusion sleeve (21). Apply sealing wax (15) at the transition between the extrusion sleeve (21) and the extended cable (6). After the sealing wax (15) solidifies, install a heat shrinkable sleeve (16), and the heat shrinkable sleeve (16) completely wraps the sealing wax (15) and the cable exposed from the extrusion sleeve assembly (19).

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