Tubing encapsulated cable for facilitating stripping

Abstract

Disclosed in the present invention is a tubing encapsulated cable for facilitating stripping. The tubing encapsulated cable comprises a tubing having a circular cross section, wherein an encapsulation layer is provided outside the tubing, an inner peripheral wall of the encapsulation layer is attached to an outer peripheral wall of the tubing, and a plurality of stripping grooves are uniformly formed in a circumferential direction on an outer peripheral wall of the encapsulation layer; the outer peripheral wall of the encapsulation layer has a circular cross section, and the number of the plurality of stripping grooves is three, that is, adjacent stripping grooves are spaced apart by 120°; and an inner end surface of each stripping groove is arc-shaped, and two side walls of the stripping groove are planar. In the present invention, the stripping grooves are uniformly formed on the periphery of the encapsulation layer of the tubing encapsulated cable, such that the positioning of jaws of a nutcracker is facilitated when the encapsulation layer is stripped using the nutcracker; and during stripping, an inward force is applied by means of the jaws of the nutcracker, such that the encapsulation between two adjacent grooves is lifted in the form of a strip, and then the encapsulation strip is pulled along the axial direction of the tubing, thereby stripping the tubing encapsulated cable. Therefore, the convenience of stripping the encapsulation layer of the tubing encapsulated cable is effectively improved, and damage to an inner tubing is avoided.

Description

An easy-to-peel encapsulated cable Technical Field

[0001] This invention relates to the field of encapsulated cable technology, and more particularly to an encapsulated cable that is easy to peel off. Background Technology

[0002] Encapsulated cables are commonly used in the oil extraction industry. These cables mainly consist of an outer encapsulation layer and an inner protective tube. They are used to protect the connection lines between underground mines and the surface. During use, the outer encapsulation layer needs to be peeled off at the ends for connection. Due to the hardness and density of the encapsulation material, peeling off the encapsulation layer is difficult. Currently, the outer encapsulation is mainly peeled off by cutting with a blade or adding tear cords inside the encapsulation. Firstly, blade cutting is cumbersome and may damage the inner tube. Adding tear cords inside creates significant resistance when dragging the cord, and the cutting action of the encapsulation layer makes the cord prone to breakage. Secondly, internal cord filling increases quality risks during encapsulation extrusion production and increases cable production costs. Therefore, a more easily peelable encapsulated cable is needed. Summary of the Invention

[0003] The purpose of this invention is to provide an easily peelable packaged cable to solve the technical problems mentioned in the background section.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The present invention provides an easy-to-peel encapsulated cable, comprising a circular cross-section cable, an encapsulation layer disposed on the outside of the cable, the inner peripheral wall of the encapsulation layer being in contact with the outer peripheral wall of the cable, and a plurality of peeling grooves being uniformly formed along the circumferential direction on the outer peripheral wall of the encapsulation layer.

[0006] Furthermore, the outer peripheral wall of the encapsulation layer has a circular cross-section, and the number of the plurality of peeling grooves is three, that is, the interval between each peeling groove is 120°.

[0007] Furthermore, the inner end face of the peeling groove is arc-shaped, and the two side walls are planar.

[0008] Furthermore, the outer peripheral wall of the encapsulation layer has a square cross-section.

[0009] Furthermore, the number of the plurality of peeling grooves is three, which are respectively opened at the middle position of the three adjacent sidewalls of the encapsulation layer.

[0010] Furthermore, a color identification band is provided between the inner wall of the portion of the encapsulation layer without the peeling groove and the outer wall of the pipeline.

[0011] Furthermore, a protective sleeve is fitted over the outer surface of the encapsulation layer. The inner circumferential wall of the protective sleeve is uniformly provided with a plurality of connecting protrusions that are adapted to each of the peeling grooves. A peeling sleeve is fitted over one end of the outer surface of the protective sleeve. A peeling mechanism is fixedly provided on the outer surface of the peeling sleeve at a position corresponding to each of the connecting protrusions.

[0012] Furthermore, each of the peeling mechanisms includes a sleeve fixedly disposed outside the peeling sleeve, a slide block slidably engaged with the sleeve inside the sleeve, and a drive assembly for driving the slide block to move at the outer end of the sleeve; a cutting blade is fixedly disposed at one end of the slide block near the peeling sleeve, and the middle part of the cutting blade slidably engages with a cutting groove formed on the peeling sleeve.

[0013] Furthermore, the drive assembly includes a threaded sleeve fixedly disposed at the outer end of the sleeve, a screw threadedly connected thereto on the threaded sleeve, one end of the screw located inside the sleeve being rotatably connected to the slide block, and a screw handle fixedly disposed at the other end of the screw located outside the sleeve.

[0014] Furthermore, one end of the screw located inside the sleeve is fixedly provided with a connector with an inverted T-shaped cross-section, and the connector is rotatably engaged with an inverted T-shaped connecting hole opened at the end of the slide block.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] This invention utilizes uniformly spaced peeling grooves on the outer periphery of the encapsulation layer of the packaged cable. This facilitates the positioning of the nutcracker jaws when peeling the encapsulation layer using nutcrackers. During peeling, simply apply inward force with the nutcracker jaws to cut the weak points of the encapsulation at the peeling groove, causing the encapsulation between the two grooves to lift up in a strip. The packaged cable can then be peeled off by dragging the encapsulation strip along the pipeline axis. This effectively improves the convenience of peeling the encapsulation layer of the packaged cable and avoids damage to the inner tube.

[0017] The inner bottom surface of the peeling groove of the present invention is arc-shaped, which can make the encapsulation thickness at each point at the bottom of the groove consistent. This also ensures uniform stress at the bottom of the groove and reduces the risk of stress concentration causing cracking of the encapsulation layer. Furthermore, the bottom force-bearing structure is curved, which can be used for clamping operations with nutcrackers of different sizes.

[0018] Furthermore, during production, this invention only requires adjusting the mold shape and the length of the sizing zone to mold the molten thermoplastic into the desired irregular shape for encapsulation. After cooling, the desired irregular shape encapsulation layer is formed. Compared to processing methods that add internal tear cords, this effectively reduces the production cost of the encapsulated cable and helps ensure product quality. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 is a cross-sectional schematic diagram of Embodiment 1 of the present invention;

[0021] Figure 2 is a schematic diagram of the peeling groove in Embodiment 1 of the present invention;

[0022] Figure 3 is a schematic diagram of the peeling state in Embodiment 1 of the present invention;

[0023] Figure 4 is a schematic diagram of the diameter reduction mold used in the production of Embodiment 1 of the present invention;

[0024] Figure 5 is a cross-sectional schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 6 is a cross-sectional schematic diagram of Embodiment 3 of the present invention;

[0026] Figure 7 is an enlarged schematic diagram of the structure at point A in Figure 6;

[0027] Figure 8 is a longitudinal cross-sectional view of Embodiment 3 of the present invention;

[0028] Explanation of reference numerals in the attached diagram: 1. Encapsulation layer; 2. Pipeline; 3. Peeling groove; 4. Color identification band; 5. Protective sleeve; 6. Connecting protrusion; 7. Sleeve; 8. Slide; 9. Cutting blade; 10. Cutting groove; 11. Threaded sleeve; 12. Screw; 13. Connector; 14. Tightening handle. Detailed Implementation

[0029] The easily peelable encapsulated tubing involved in this invention is suitable for encapsulated tubing covered with thermoplastic materials such as polyvinylidene fluoride (PVDF), polypropylene (PP), polyamide (PA), thermoplastic elastomers (TPE, TPU, TPR), thermoplastic vulcanizate (TPV), ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroethylene propylene (FEP), ethylene trifluorochloroethylene copolymer (ECTFE), and polytetrafluoroethylene (PFA).

[0030] Example 1

[0031] As shown in Figures 1 and 2, an easily peelable encapsulated cable includes a circular cross-section pipe 2, which is used for hydraulic control by filling with oil or for the injection and conduction of chemical reagents. An encapsulation layer 1 is fitted around the outside of the pipe 2, and the inner peripheral wall of the encapsulation layer 1 is in contact with the outer peripheral wall of the pipe 2 to provide protection for the internal pipe 2 and resist corrosion from downhole annular fluids.

[0032] Multiple peeling grooves 3 are uniformly formed along the circumferential direction on the outer peripheral wall of the encapsulation layer 1. In this embodiment, the cross-section of the outer peripheral wall of the encapsulation layer 1 is circular, and the number of the multiple peeling grooves 3 is specifically three, that is, the interval between each peeling groove is 120°.

[0033] As shown in Figure 3, the application of the peeling groove 3 makes it easier to position the nutcracker jaws. When peeling, the nutcracker jaws are used to apply force inward to cut the weak point of the encapsulation in the groove. This will cause the encapsulation between the two grooves to lift up in a strip. At this time, the encapsulation strip can be peeled off along the groove by dragging it along the pipeline axis.

[0034] To ensure the thickness of the encapsulation layer, the inner end face of the peeling groove 3 is arc-shaped, while the two sidewalls are flat. The bottom of the groove is arc-shaped, rather than flat, to ensure that the encapsulation thickness at all points on the bottom of the groove is consistent. This also ensures uniform stress at the bottom of the groove, reducing the risk of stress concentration causing cracking of the encapsulation layer. Compared to V-shaped or U-shaped grooves, the square groove has a curved bottom surface, making it suitable for nutcrackers with different jaw sizes.

[0035] In this embodiment, a color identification band 4 is provided between the inner wall of the portion of the encapsulation layer without the peeling groove 3 and the outer wall of the pipeline 2. The color identification band 4 can be used to identify the inner tube of the encapsulation.

[0036] As shown in Figure 4, in this embodiment, when designing the mold for irregularly shaped encapsulated cables, the diameter reduction of the thermoplastic encapsulation material in the molten and solid states must be considered. For example, if the required size after cooling is φ11mm, the mold design should consider the encapsulation layer thickness and the groove shape, resulting in a diameter of φ11.5mm. To ensure the shape of the groove, the length of the sizing zone also needs to be adjusted during mold design. An excessively long sizing zone can easily cause material buildup and scratches on the encapsulation surface, while an excessively short sizing zone will result in poor outer encapsulation molding and indistinct groove formation. To ensure the molding effect of irregularly shaped encapsulations, extrusion molding must be used.

[0037] Example 2

[0038] In this embodiment, without changing the other structures of Embodiment 1, the outer peripheral wall cross-section of the encapsulation layer is specifically set to be square.

[0039] In this embodiment, there are three peeling grooves 3, each located in the middle of three adjacent sidewalls of the encapsulation layer. The peeling method in this embodiment is the same as in Embodiment 1. In this embodiment, the peeling grooves are flat-bottomed, and the direction of the color identification band 4 is limited by the thickness of the encapsulation layer, so no peeling grooves are provided. During peeling, either adjacent two sides of the encapsulation can be clamped off using clamps, or opposite sides can be clamped off.

[0040] Example 3

[0041] In this embodiment, without changing the other structures of Embodiment 1, a protective sleeve 5 is fitted over the outside of the encapsulation layer 1. The protective sleeve 5 further improves the protection effect on the encapsulated cable. Especially at the slotted portion of the encapsulation layer 1, the inner circumferential wall of the protective sleeve 5 is uniformly provided with multiple connecting protrusions 6 that are adapted to each of the peeling grooves 3. By the one-to-one cooperation between each connecting protrusion 6 and each peeling groove 3, the protective sleeve 5 and the encapsulation layer 1 are connected in a limiting manner.

[0042] The protective sleeve 5 has a peeling sleeve 15 fitted on one end of its outer side. The peeling sleeve 15 is made of stainless steel. The peeling sleeve 15 has a peeling mechanism fixedly installed on its outer side at a position corresponding to each of the connecting protrusions 6.

[0043] Each of the peeling mechanisms includes a sleeve 7 fixedly disposed radially outside the peeling sleeve 15. A slide block 8 is slidably fitted inside the sleeve 7, and a drive assembly for driving the slide block 8 is disposed at the outer end of the sleeve 7. A cutting blade 9 is fixedly mounted on one end of the slide block 8 near the peeling sleeve 15. The middle portion of the cutting blade 9 slidably fits into a cutting groove 10 formed on the peeling sleeve 15, and the cutting direction of the cutting blade 9 faces the protective sleeve 5.

[0044] In this embodiment, the driving assembly includes a threaded sleeve 11 fixedly installed on the outer end of the sleeve 7. A screw 12 threadedly connected to the threaded sleeve 11 is mounted on the threaded sleeve 11. One end of the screw 12 located inside the sleeve 7 is rotatably connected to the slide block 8. Specifically, a connector 13 with an inverted T-shaped cross-section is fixedly provided at the end of the screw 12 located inside the sleeve 7. The connector 13 is rotatably engaged with an inverted T-shaped connecting hole opened at the end of the slide block 8. A screw handle 14 is fixedly provided at the end of the screw 12 located outside the sleeve 7.

[0045] This embodiment further enhances the protection of the encapsulated cable, especially the slotted area of ​​the encapsulation layer, by setting a protective sleeve. As shown in Figure 6, before use, each cutting blade penetrates the corresponding cutting groove and enters the connecting protrusion of the protective sleeve 5 to a certain depth. This ensures the peeling sleeve is fixed on the protective sleeve and prevents easy slippage. When it is necessary to peel off the encapsulation layer of the cable, first rotate the screw handles at the ends of each screw in sequence. During the rotation of the screw, it needs to maintain a threaded connection with the threaded sleeve fixed on the sliding sleeve, which will drive the sliding block inside the sliding sleeve to move linearly towards the peeling sleeve. As the blade moves synchronously with the sliding block, its cutting edge penetrates the connecting protrusion of the protective sleeve and enters the encapsulation layer to a certain depth. It is important to note that the movement distance of the cutting blade needs to be controlled to avoid damage to the inner tube after the cutting blade penetrates the encapsulation layer. After adjusting the feed of each cutting blade by rotating the handle, the operator can apply a pushing force to the outside of the multiple sliding sleeves, thereby pushing the entire stripping sleeve to slide along the axis of the encapsulated cable. During the sliding process, each cutting blade equally cuts the protective sleeve, allowing the operator to easily peel it off. Furthermore, during the cutting process, the cutting blades also leave cut marks on the inner end face of the peeling grooves in the encapsulation layer, making it easier to subsequently use nutcrackers to detach the encapsulation layer between the two peeling grooves from the internal pipeline.

[0046] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A readily strippable encapsulated tube cable, characterized by: The device includes a pipeline with a circular cross-section, and an encapsulation layer is provided on the outside of the pipeline. The inner peripheral wall of the encapsulation layer is attached to the outer peripheral wall of the pipeline, and multiple peeling grooves are uniformly formed on the outer peripheral wall of the encapsulation layer along the circumferential direction.

2. The easily stripped encapsulated tube cable of claim 1, wherein: The outer peripheral wall of the encapsulation layer has a circular cross-section, and the number of the plurality of peeling grooves is three, that is, the interval between each peeling groove is 120°.

3. The easily strippable encapsulated tube cable of claim 2, wherein: The inner end face of the peeling groove is arc-shaped, and the two side walls are planar.

4. The easily stripped encapsulated tube cable of claim 1, wherein: The outer peripheral wall of the encapsulation layer has a square cross-section.

5. The easily strippable encapsulated tube cable of claim 4, wherein: The number of the plurality of peeling grooves is three, and they are respectively opened at the middle position of the three adjacent sidewalls of the encapsulation layer.

6. The easily strippable encapsulated tube cable of claim 1, wherein: A color identification band is provided between the inner wall of the portion of the encapsulation layer without the peeling groove and the outer wall of the pipeline.

7. The easily strippable encapsulated tube cable of claim 1, wherein: The outer surface of the encapsulation layer is covered with a protective sleeve. The inner circumferential wall of the protective sleeve is uniformly provided with a plurality of connecting protrusions that are adapted to each of the peeling grooves. A peeling sleeve is provided on one end of the outer surface of the protective sleeve. A peeling mechanism is fixedly provided on the outer surface of the peeling sleeve at a position corresponding to each of the connecting protrusions.

8. The easily strippable encapsulated tube cable of claim 7, wherein: Each of the peeling mechanisms includes a sleeve fixedly disposed outside the peeling sleeve, a slide block slidably engaged with the sleeve inside the sleeve, and a drive assembly for driving the slide block to move at the outer end of the sleeve; a cutting blade is fixedly disposed at one end of the slide block near the peeling sleeve, and the middle part of the cutting blade slidably engages with a cutting groove formed on the peeling sleeve.

9. The easily strippable encapsulated tube cable of claim 8, wherein: The drive assembly includes a threaded sleeve fixedly disposed at the outer end of the sleeve, a screw threadedly connected thereto on the threaded sleeve, one end of the screw located inside the sleeve being rotatably connected to the slide block, and a screw handle fixedly disposed at the other end of the screw located outside the sleeve.

10. The easily strippable encapsulated tube cable of claim 9, wherein: The screw is fixedly provided with an inverted T-shaped connector at one end inside the sleeve, and the connector is rotatably engaged with an inverted T-shaped connecting hole at the end of the slide block.

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