Cushioning impact-resistant flat cable and production process thereof

Abstract

The invention relates to the field of elevator cables, and discloses a cushioning impact-resistant flat cable and a production process thereof.The cushioning impact-resistant flat cable comprises an outer sheath with a flat square section, the two side edges of the outer sheath are arc edges, a middle wiring cavity is formed in the outer sheath, the left side and the right side of the middle wiring cavity are each provided with a side wiring cavity, and two middle cushioning pieces are vertically arranged in the middle wiring cavity side by side; two control wire cores are transversely arranged between the two middle cushioning pieces side by side, and a lighting wire is arranged between the two control wire cores. The two side wiring cavities are in a parallelogram shape, video line sets and communication line sets are arranged in the two side wiring cavities, the video line sets and the communication line sets are trapezoid and are meshed with each other in a staggered mode, and the bottom edges and the side edges of the video line sets and the communication line sets abut against the inner walls of the side wiring cavities where the video line sets and the communication line sets are located. And gaps are formed between the top edges of the video line group and the communication line group and the inner wall of the wiring cavity on the side. The problem that an existing elevator cable is poor in impact resistance can be solved.

Description

Technical Field

[0001] The invention relates to the field of elevator cables, and in particular to a shock-absorbing and impact-resistant flat cable and a production process thereof. Background Art

[0002] With the acceleration of urbanization, high-rise buildings are springing up like mushrooms after a rain. As a key equipment for vertical transportation, the safety, reliability and stability of elevators have attracted much attention. In the operation system of elevators, elevator cables play an extremely important role, responsible for providing power transmission and signal transmission for the elevator car, control system, etc. However, the existing elevator cables have obvious deficiencies in impact resistance, which brings many hidden dangers to the safe and stable operation of elevators.

[0003] Traditional elevator cables are relatively conventional in structural design, mostly using a simple combination of round wire cores, and lack an effective impact-resistant buffer structure. When the elevator is subjected to shocks such as sudden acceleration, deceleration, shaking of the car, or collision with external objects during operation, the wire core inside the cable directly bears the impact force. Due to the lack of sufficient buffering and energy absorption mechanisms, the wire core is prone to deformation and breakage, which in turn leads to power transmission interruption or signal transmission abnormality. This will not only affect the normal operation of the elevator, causing emergencies such as passengers being trapped, but may also cause serious safety accidents.

[0004] The insulation layer of existing elevator cables is also easily damaged when facing long-term vibration and impact environments. Once the insulation layer is damaged, it will reduce the electrical insulation performance of the cable, increase the risk of leakage, and pose a threat to the elevator's electrical system and passenger safety. In addition, ordinary elevator cables have limited flexibility and bending resistance. During the frequent up and down movement of the elevator, the cable needs to bend and stretch continuously, which can easily cause fatigue damage to the internal structure of the cable, further reducing its impact resistance.

[0005] In order to solve these problems, there are some improved elevator cables on the market, but most of them are simply adjusted locally, such as increasing the strength of the wire core or thickening the insulation layer, and fail to fundamentally solve the problem of poor impact resistance. These improvement measures are not only costly, but also not ideal, and cannot meet the elevator industry's growing demand for high performance cables. Summary of the invention

[0006] The present invention aims to provide a shock-absorbing and impact-resistant flat cable to improve the problem of poor impact resistance of existing elevator cables.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a shock-absorbing and impact-resistant flat cable, including an outer sheath with a flat square cross-section, the two side edges of the outer sheath are arc edges, a central wiring cavity is arranged in the outer sheath, and a side wiring cavity is respectively arranged on the left and right sides of the central wiring cavity, two middle shock-absorbing parts are arranged vertically side by side in the middle wiring cavity, two control wire cores are arranged horizontally side by side between the two middle shock-absorbing parts, and a lighting wire is arranged between the two control wire cores; the two side wiring cavities are parallelogram-shaped and each of which is provided with a video line group and a communication line group, the video line group and the communication line group are both trapezoidal and are arranged in a staggered manner in meshing with each other, the bottom edges and side edges of the video line group and the communication line group are against the inner wall of the side wiring cavity, and a gap is formed between the top edges of the video line group and the communication line group and the inner wall of the side wiring cavity.

[0008] Preferably, as an improvement, the diameter of the lighting wire is smaller than the diameter of the control wire core, and the middle shock-absorbing member is bow-shaped or shuttle-shaped.

[0009] Preferably, as an improvement, the middle shock-absorbing member is an arched tube or a shuttle tube.

[0010] Preferably, as an improvement, the side wiring cavity and the video line group and communication line group therein are distributed in left and right mirror images with the lighting line as the center.

[0011] Preferably, as an improvement, the side wiring cavity and the video line group and communication line group therein are symmetrically distributed on the left and right axes with the lighting line as the center.

[0012] Preferably, as an improvement, a semicircular buffer cavity is respectively provided on the left side of the left side wiring cavity and on the right side of the right side wiring cavity, and the arc surface of the buffer cavity is close to the side end of the outer sheath.

[0013] Preferably, as an improvement, a circular side shock-absorbing tube is provided in the buffer cavity.

[0014] The present invention also provides a production process for a shock-absorbing and impact-resistant flat cable, which is used to produce the shock-absorbing and impact-resistant flat cable, comprising:

[0015] A. Prepare lighting wires and control wire cores, prepare video wire groups and communication wire groups, and extrude the video wire groups and communication wire groups into trapezoidal shapes on an extruder through an extrusion die with a trapezoidal extrusion port;

[0016] B. Extrusion molding of elastic material into a middle shock absorbing member and a side shock absorbing tube;

[0017] C. Prepare an outer sheath extrusion die, which includes an outer die and an inner die. The outer die is provided with a conical extrusion flow channel, and the inner die is provided with a tapered die core inserted into the extrusion flow channel. The end of the tapered die core is sequentially arranged side by side with five forming tubes of semicircle, parallelogram, rectangle, parallelogram and semicircle;

[0018] D. Install the outer sheath extrusion die on the extruder, insert the side shock-absorbing tube into the semicircular forming tube, install the video line group and the communication line group into the parallelogram forming tube in an interlocking and staggered manner, insert the middle shock-absorbing component, the lighting line, and the control line core into the rectangular forming tube, and keep the two middle shock-absorbing components clamping the lighting line and the control line core. Use polyvinyl chloride as the raw material to extrude the outer sheath on the outside. During the extrusion process, a vertical extrusion method with the machine head vertically downward is adopted. The raw material fills the extrusion flow channel on the outside of the forming tube. After extrusion, the middle wiring cavity, the side wiring cavity and the buffer cavity are formed in the outer sheath.

[0019] Preferably, as an improvement, the elastic material in step B is rubber.

[0020] Preferably, as an improvement, the middle shock-absorbing member in step B is a bow-shaped or shuttle-shaped tube.

[0021] The principles of this solution include:

[0022] Structural design and bending resistance: The shock-absorbing and impact-resistant flat cable designed by the present invention is flat and square in shape, and the two sides of the outer sheath are arc edges. Compared with traditional round cables, this flat structure has a more uniform stress distribution when bent, and is not easy to concentrate on a certain point, thereby greatly improving the bending resistance of the cable. At the same time, the flat structure makes the arrangement of the cable in a limited space more flexible, and can better adapt to the complex wiring environment of the elevator. In the process of frequent bending, the deformation of its internal structure is relatively small, which ensures the flexibility of the cable and enables it to move smoothly with the car during the operation of the elevator.

[0023] Anti-shock buffer principle:

[0024] Energy absorption of trapezoidal wire groups: The video wire group and communication wire group in the side wiring cavity are both trapezoidal and meshed with each other in a staggered arrangement. When the cable is impacted or squeezed, the trapezoidal wire groups will be dislocated due to pressure. In this process, the relative displacement of the trapezoidal wire group will consume part of the impact energy, and the reduction in cable thickness also plays a buffering role. Just like gears meshing with each other, when subjected to external force, the relative movement between teeth can disperse and absorb energy.

[0025] Deformation buffering of the shock-absorbing tube: The arched or shuttle-shaped middle shock-absorbing member (arched tube or shuttle tube) set in the middle wiring cavity and the circular side shock-absorbing tube in the buffer cavity are all made of elastic materials such as rubber. When the cable is impacted, these shock-absorbing tubes will be deformed under force. According to the characteristics of elastic materials, the deformation process will absorb impact energy and pressure, just like a spring stores energy when it is compressed by external force. Moreover, the elastic material can restore its original shape after the impact disappears, and can continue to provide buffering protection for the cable, ensuring that the impact force on the internal core is effectively weakened. The middle shock-absorbing member is located between the control core and the lighting line, which not only protects these key cores from direct impact, but also absorbs and disperses the impact force through its deformation. The side shock-absorbing tube is located at the outer edge of the side wiring cavity, which further enhances the impact resistance of the cable side. Thereby ensuring the normal operation of the core and reducing the risk of damage caused by impact.

[0026] During the extrusion process of the outer sheath, a vertical extrusion method with the die head pointing vertically downward is adopted. Combined with the selection of the outer sheath material and the structural design of the internal wiring cavity, the wiring cavity can be stably and effectively formed during the extrusion process.

[0027] Advantages of the present invention include:

[0028] Excellent bending resistance: The flat structure design of the cable fundamentally improves its bending resistance. During the frequent up and down movement of the elevator, the traditional round cable is prone to fatigue damage to the internal structure due to repeated bending, resulting in performance degradation or even failure. The flat cable of the present invention, with its unique structure, can withstand more bending times, reducing problems such as internal wire core breakage and insulation layer damage caused by bending, greatly improving the service life and reliability of the cable, and reducing maintenance costs and replacement frequency.

[0029] Highly efficient impact resistance: Through the synergistic effect of the trapezoidal wire group and the shock-absorbing tube, a highly efficient impact resistance effect is achieved. During the operation of the elevator, whether it is the sudden acceleration and deceleration, shaking of the car or the accidental collision with external objects, the cable can effectively cope with it. Under the dual protection of the trapezoidal wire group and the shock-absorbing tube, the impact force on the internal wire core is greatly reduced, which greatly reduces the possibility of deformation and breakage of the wire core, ensures the stability of power transmission and signal transmission, avoids elevator operation failures caused by impact, effectively improves the safety and reliability of elevator operation, and reduces the probability of emergencies such as passengers being trapped.

[0030] Good elastic recovery and long-term protection: The elastic materials such as rubber used to make the shock-absorbing parts and shock-absorbing tubes have good elastic recovery capabilities. After being impacted multiple times, these elastic components can still maintain their buffering performance and continue to provide protection for the cables. Compared with some disposable materials or materials whose buffering performance gradually decreases with the increase in the number of uses, the elastic material of the present invention can play a role in a long-term and stable manner, ensuring that the cable has reliable impact resistance throughout its entire service life, providing a strong guarantee for the long-term stable operation of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0032] Figure 2 This is a schematic diagram of the deformation of Example 1 of the present invention after being impacted.

[0033] Figure 3 This is a front view of the inner mold in Example 2 of the present invention. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: outer sheath 1, side shock-absorbing tube 2, buffer cavity 3, side wiring cavity 4, middle wiring cavity 5, lighting line 6, middle shock-absorbing component 7, video line group 8, communication line group 9, control line core 10, inner mold 11, tapered mold core 12, and molding tube 13.

[0036] Embodiment 1, basically as attached Figure 1 As shown: a shock-absorbing and impact-resistant flat cable, comprising an outer sheath 1 made of polyvinyl chloride with a flat square cross-section, the two sides of the outer sheath 1 are arc sides, a central wiring cavity 5 is provided in the outer sheath 1, a side wiring cavity 4 is provided on the left and right sides of the central wiring cavity 5, two central shock-absorbing parts 7 are arranged vertically side by side in the central wiring cavity 5, and the central shock-absorbing parts 7 are arched rubber tubes. Two control wire cores 10 are arranged horizontally side by side between the two central shock-absorbing parts 7, and a lighting wire 6 is arranged between the two control wire cores 10, and the diameter of the lighting wire 6 is smaller than the diameter of the control wire core 10, and the two central shock-absorbing parts 7 are against the upper and lower inner walls of the central wiring cavity 5 and clamp the lighting wire 6 and the control wire core 10. The two side wiring cavities 4 are parallelogram-shaped and each is provided with a video line group 8 and a communication line group 9. The video line group 8 and the communication line group 9 are both trapezoidal and are arranged in a staggered manner and mesh with each other. The bottom and side edges of the video line group 8 and the communication line group 9 are against the inner wall of the side wiring cavity 4, and a gap is formed between the top edge of the video line group 8 and the communication line group 9 and the inner wall of the side wiring cavity 4. The side wiring cavity 4 and the video line group 8 and the communication line group 9 therein are distributed in a left and right mirror image with the lighting line 6 as the center.

[0037] A semicircular buffer cavity 3 is provided on the left side of the left side wiring cavity 4 and on the right side of the right side wiring cavity 4. The arc surface of the buffer cavity 3 is close to the side end of the outer sheath 1. A circular side shock-absorbing tube 2 is provided in the buffer cavity 3, and the side shock-absorbing tube 2 is a rubber tube.

[0038] Embodiment 2, a process for producing a shock-absorbing and impact-resistant flat cable, used for producing the shock-absorbing and impact-resistant flat cable of embodiment 1, comprising:

[0039] A. Prepare lighting wire 6 and control wire core 10, prepare video wire group 8 and communication wire group 9, and extrude the video wire group 8 and communication wire group 9 into a trapezoidal shape through an extrusion die with a trapezoidal extrusion port on an extruder;

[0040] B. Extrusion molding of rubber material into a middle shock absorbing member 7 and a side shock absorbing tube 2, wherein the middle shock absorbing member 7 is a bow-shaped or shuttle-shaped tube;

[0041] C. Prepare an extrusion die for the outer sheath 1. The extrusion die for the outer sheath 1 includes an outer die and an inner die 11. The outer die is provided with a conical extrusion flow channel. Figure 3 As shown, the inner mold 11 is provided with a tapered core 12 inserted into the extrusion flow channel, and the end of the tapered core 12 is sequentially arranged side by side with five forming tubes 13 of semicircular, parallelogram, rectangular, parallelogram, and semicircular shapes;

[0042] D. Install the extrusion die of the outer sheath 1 on the extruder, insert the side shock-absorbing tube 2 into the semicircular forming tube 13, install the video line group 8 and the communication line group 9 into the parallelogram forming tube 13 by meshing with each other and staggering, insert the middle shock-absorbing component 7, the lighting line 6, and the control line core 10 into the rectangular forming tube 13, and keep the two middle shock-absorbing components 7 clamping the lighting line 6 and the control line core 10, use polyvinyl chloride as the raw material to extrude the outer side to form the outer sheath 1, and adopt the vertical extrusion method with the head vertically downward during the extrusion process, and the raw material fills the extrusion flow channel outside the forming tube 13, and the middle wiring cavity 5, the side wiring cavity 4 and the buffer cavity 3 are formed in the outer sheath 1 after extrusion.

[0043] Embodiment 3: The difference between this embodiment and embodiment 1 is that the middle shock absorbing member 7 is a bow-shaped rubber strip.

[0044] Embodiment 4: The difference between this embodiment and embodiment 1 is that the middle shock absorbing member 7 is a shuttle-shaped rubber strip.

[0045] Embodiment 5: The difference between this embodiment and embodiment 1 is that the middle shock absorbing member 7 is a shuttle-shaped rubber tube.

[0046] Embodiment 6: The difference between this embodiment and embodiment 1 is that the left and right wiring cavities and the video line group 8 and the communication line group 9 therein are symmetrically distributed on the left and right axes with the lighting line 6 as the center.

[0047] In actual use, combined with Figure 2 As shown, the elevator starts up at an accelerated speed: the elevator is packed with passengers, and as the elevator is ready to move upward, the motor starts and generates powerful power instantly, causing the car to accelerate suddenly. At this time, the shock-absorbing and impact-resistant flat cable connected to the car is also subjected to large tension and impact forces. The trapezoidal video line group 8 and the communication line group 9 in the cable are slightly misaligned due to the force. In this process, they absorb part of the impact energy through relative displacement. At the same time, the arched middle shock-absorbing member 7 of the middle wiring cavity 5 and the circular side shock-absorbing tube 2 in the buffer cavity 3 are also squeezed and deformed, which further buffers the tension and impact forces, protects the internal wire core, ensures the stable transmission of electricity and signals, and allows the elevator to start and rise smoothly.

[0048] Elevator emergency braking: During the operation of the elevator, an abnormal situation is suddenly detected, and the safety system immediately triggers the emergency brake. The car decelerates rapidly in a short period of time, and the huge inertia makes the cable bear a strong impact force. The trapezoidal wire groups on both sides of the flat cable are obviously misaligned under the pressure, which effectively reduces the overall thickness of the cable and absorbs a lot of impact energy. At the same time, each shock-absorbing tube is sharply compressed. With the characteristics of elastic materials, they convert the impact force into their own elastic potential energy, which greatly reduces the impact force on the internal wire core, avoids damage to the wire core caused by impact, ensures safe communication and power supply during the elevator braking process, and prevents more serious consequences caused by cable failure.

[0049] Elevator sway: When the elevator is running at high speed, it encounters a certain degree of sway. The shock-absorbing and impact-resistant flat cable connecting the car is constantly subjected to impact forces from different directions. The trapezoidal wire group inside the cable flexibly adjusts its position as the car sways, and consumes the impact energy through dislocation and mutual extrusion. At the same time, the shock-absorbing tube undergoes complex deformation under the impact force in all directions, absorbing the impact energy in all directions and effectively protecting the wire core, so that during the shaking process of the elevator, its control system can still stably receive signals through the cable, ensuring the safe operation of the elevator and avoiding dangerous situations caused by signal interruption or power failure.

[0050] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Shock-absorbing and impact-resistant flat cable, characterized by: It includes an outer sheath with a flat square cross-section, the two side edges of the outer sheath are arc edges, a central wiring cavity is arranged in the outer sheath, and a side wiring cavity is provided on each of the left and right sides of the central wiring cavity, two central shock-absorbing parts are arranged vertically side by side in the central wiring cavity and are against the inner wall of the central wiring cavity, two control wire cores are arranged horizontally side by side between the two central shock-absorbing parts, a lighting wire is arranged between the two control wire cores, and the two central shock-absorbing parts clamp the lighting wire and the control wire core in the central wiring cavity; the two side wiring cavities are parallelogram-shaped and each is provided with a video wire group and a communication wire group, the video wire group and the communication wire group are both trapezoidal and are arranged in a staggered manner in meshing with each other, the bottom edges and side edges of the video wire group and the communication wire group are against the inner wall of the side wiring cavity, and a gap is formed between the top edges of the video wire group and the communication wire group and the inner wall of the side wiring cavity.

2. The shock-absorbing and impact-resistant flat cable according to claim 1, characterized in that: The diameter of the lighting wire is smaller than the diameter of the control wire core, and the middle shock-absorbing member is in a bow shape or a shuttle shape.

3. The shock-absorbing and impact-resistant flat cable according to claim 2, characterized in that: The middle shock-absorbing member is an arch-shaped tube or a shuttle-shaped tube.

4. The shock-absorbing and impact-resistant flat cable according to claim 3, characterized in that: The side wiring cavity and the video line group and communication line group therein are distributed in left and right mirror images with the lighting line as the center.

5. The shock-absorbing and impact-resistant flat cable according to claim 3, characterized in that: The side wiring cavity and the video line group and the communication line group therein are symmetrically distributed on the left and right axes with the lighting line as the center.

6. The shock-absorbing and impact-resistant flat cable according to claim 3, characterized in that: A semicircular buffer cavity is respectively arranged on the left side of the left side wiring cavity and on the right side of the right side wiring cavity, and the arc surface of the buffer cavity is close to the side end of the outer sheath.

7. The shock-absorbing and impact-resistant flat cable according to claim 6, characterized in that: A circular side shock-absorbing tube is arranged in the buffer cavity.

8. A process for producing a shock-absorbing and impact-resistant flat cable, used for producing a shock-absorbing and impact-resistant flat cable as claimed in any one of claims 1 to 7, characterized in that: include A. Prepare lighting wires and control wire cores, prepare video wire groups and communication wire groups, and extrude the video wire groups and communication wire groups into trapezoidal shapes on an extruder through an extrusion die with a trapezoidal extrusion port; B. Extrusion molding of elastic material into a middle shock absorbing member and a side shock absorbing tube; C. Prepare an outer sheath extrusion die, which includes an outer die and an inner die. The outer die is provided with a conical extrusion flow channel, and the inner die is provided with a tapered die core inserted into the extrusion flow channel. The end of the tapered die core is sequentially arranged side by side with five forming tubes of semicircle, parallelogram, rectangle, parallelogram and semicircle; D. Install the outer sheath extrusion die on the extruder, insert the side shock-absorbing tube into the semicircular forming tube, install the video line group and the communication line group into the parallelogram forming tube in an interlocking and staggered manner, insert the middle shock-absorbing component, the lighting line, and the control line core into the rectangular forming tube, and keep the two middle shock-absorbing components clamping the lighting line and the control line core. Use polyvinyl chloride as the raw material to extrude the outer sheath on the outside. During the extrusion process, a vertical extrusion method with the machine head vertically downward is adopted. The raw material fills the extrusion flow channel on the outside of the forming tube. After extrusion, the middle wiring cavity, the side wiring cavity and the buffer cavity are formed in the outer sheath.

9. The process for producing a shock-absorbing and impact-resistant flat cable according to claim 8, characterized in that: The elastic material in step B is rubber.

10. The process for producing a shock-absorbing and impact-resistant flat cable according to claim 9, characterized in that: The middle shock-absorbing member in step B is a bow-shaped or shuttle-shaped tube.

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