Limiting reversing device

Abstract

The application discloses a limiting reversing device, which comprises a main frame, a plurality of supporting wheels and a limiting mechanism. The main frame is provided with a cavity, a first opening and a second opening which are communicated with two ends of the cavity and are used for the cable to pass through. The plurality of supporting wheels are arranged in an arc shape from the first opening to the second opening and are used for supporting the cable. The limiting mechanism comprises a trigger rod, a reset spring and a proximity switch. The reset spring is arranged on the main frame, the trigger rod is rotationally connected with the main frame, the first end of the trigger rod is connected with the reset spring and is used for triggering the proximity switch, and the second end of the trigger rod is used for supporting the cable. The whole device is simple in structure, convenient to install, stable in cooperation of components, can be adapted to cables of different specifications, has a wide application range, and realizes automatic monitoring and protection of the bending state of the cable through the combination of the mechanical structure and the electric control element, thereby reducing the cost of manual monitoring and improving the safety and reliability of the cable use.

Description

Technical Field

[0001] This application belongs to the technical field of limit switching devices, and particularly relates to a limit switching device. Background Technology

[0002] During long-distance cable transmission, laying, and equipment connection, cables often need to undergo directional transitions and reversals. In this process, the bending state and stress uniformity of the cable directly affect its safety and service life.

[0003] Currently, existing cable transmission systems typically guide cables for reversal using only simple guide structures, lacking dedicated limiting and protection mechanisms. This leads to numerous problems during cable reversal: on the one hand, uneven stress on the cable during reversal can easily cause excessive bending, i.e., the bending angle exceeds the safety threshold, which can lead to breakage of the internal core wires and damage to the external sheath. This not only affects the normal signal transmission or power delivery of the cable, but may also cause safety hazards such as short circuits and leakage due to sheath damage. In severe cases, it can even cause equipment failure and economic losses. Summary of the Invention

[0004] This application aims to at least partially address the problem that cables, during long-distance transmission or reversing, are prone to excessive bending due to excessive bending angles and uneven stress, leading to breakage of the internal core wires or damage to the external sheath. To this end, this application provides a limiting reversing device.

[0005] In a first aspect, the present application provides a limiting and reversing device, comprising: a main frame, multiple rollers, and a limiting mechanism; the main frame has a cavity and a first opening and a second opening communicating with both ends of the cavity, the first opening and the second opening being for cable to pass through; the multiple rollers are arranged in an arc along the first opening to the second opening, the multiple rollers being used to hold the cable; the limiting mechanism includes a trigger rod, a reset spring, and a proximity switch; the reset spring is disposed on the main frame, the trigger rod is rotatably connected to the main frame, the first end of the trigger rod is connected to the reset spring and is used to trigger the proximity switch, and the second end of the trigger rod is used to hold the cable.

[0006] Optionally, the limiting mechanism also includes a transition wheel, which is connected to the second end of the trigger rod, and the trigger rod holds the cable through the transition wheel.

[0007] Optionally, the limiting and reversing device includes a swing arm and a swing frame disposed in the cavity. The swing arm is rotatably connected to the main frame, and the swing frame is connected to the swing arm. The swing frame has a limiting hole for cable to pass through.

[0008] Optionally, the limit switching device includes a forward switch and a reverse switch, which are located on opposite sides of the swing arm and are used to trigger the forward switch or the reverse switch during the swing of the swing arm.

[0009] Optionally, the limit reversing device includes a balance beam with a flat top. The balance beam is connected to and symmetrical with respect to the swing arm, and the flat surface is opposite to the forward switch and the reverse switch, respectively.

[0010] Optionally, the limiting and reversing device includes multiple guide wheels, which are rotatably connected to the opposite ends of the swing frame and partially extend into the limiting hole.

[0011] Optionally, multiple rollers are symmetrically distributed on opposite sides of the swing arm.

[0012] Optionally, the main frame is provided with an arc-shaped swing groove, and the swing frame is assembled in the swing groove.

[0013] Optionally, the limit reversing device includes a buffer block, which is connected to the main frame and is used to support the swing arm.

[0014] Optionally, the limiting and reversing device includes a protective roller, which is rotatably connected to the main frame and located at the first opening and / or the second opening.

[0015] The beneficial effects of this application are: Multiple arc-shaped rollers provide stable support and guidance for the cable, reducing frictional resistance during transitions and preventing abnormal bending due to excessive local stress. Simultaneously, the limiting mechanism monitors the cable's bending status in real time. When excessive bending occurs, the bent cable pushes a trigger rod to rotate, triggering a proximity switch at its first end. The proximity switch then sends a control signal to the cable equipment, stopping its operation and preventing further stress on the cable, thus avoiding breakage and providing real-time cable protection.

[0016] Once the cable bends and returns to normal, the reset spring quickly pushes the trigger rod to reset, releasing the proximity switch and allowing the cable equipment to resume normal operation. This ensures the safe use of the cable without affecting the normal operating efficiency of the equipment. Furthermore, the entire device has a simple structure, is easy to install, and its components work together stably. It can adapt to cables of different specifications and has a wide range of applications. At the same time, through the combination of mechanical structure and electrical control components, it realizes automatic monitoring and protection of cable bending status, reducing the cost of manual monitoring and improving the safety and reliability of cable use.

[0017] The limiting mechanism also includes a transition wheel, a return spring mounted on the main frame, and a trigger rod rotatably connected to the main frame. The first end of the trigger rod is connected to the return spring and can trigger a proximity switch. The second end of the trigger rod is connected to the transition wheel, which holds the cable against it, preventing direct contact and damage. When the cable is in a normal bending state, the trigger rod remains in its initial position under the action of the return spring and does not trigger the proximity switch. When the cable undergoes excessive bending, the bent cable pushes the transition wheel, causing the trigger rod to rotate around the main frame. The first end of the trigger rod then triggers the proximity switch, which stops the cable equipment. When the cable bends back to normal, the return spring resets the trigger rod and transition wheel, releasing the proximity switch and allowing the equipment to resume normal operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the limit reversing device provided in this application; Figure 2 This is a schematic diagram of the limiting mechanism provided in this application; Figure 3 This is a schematic diagram of the swing mechanism provided in this application; Figure 4 This is a schematic diagram of the three states of the swinging mechanism provided in this application during the swinging process; Figure label: 10 Main frame; 101 First opening; 102 Second opening; 103 Arc-shaped swing groove; 20 Support rollers; 30 Limiting mechanism; 31 Trigger rod; 32 Return spring; 33 Proximity switch; 34 Transition wheel; 40 Swing arm; 50 Swing frame; 51 Limit hole; 61 Forward switch; 62 Reverse switch; 70 Balance beam; 80 Guide wheel; 91 Buffer block; 92 Protective roller. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described application is only a part of this application, not all of it. Based on the applications in this application, all other applications obtained by a person skilled in the art without inventive effort are within the scope of protection of this application.

[0021] It should be noted that all directional indications in this application are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, technical solutions from different applications can be combined, but only on the basis of being achievable by a person skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed in this application. This application is described below with reference to the accompanying drawings and specific applications: Please see Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of the limit reversing device provided in this application. Figure 2 This is a schematic diagram of the limiting mechanism 30 provided in this application.

[0024] The limiting and reversing device disclosed in this application includes a main frame 10, multiple support rollers 20, and a limiting mechanism 30. These components work together to limit and protect the cable during reversal. The specific structure and function are as follows: The main frame 10 serves as the mounting base for the entire device and has an internal cavity. At both ends of the cavity are interconnected openings 101 and 102, which together form a cable passage, ensuring the cable can smoothly pass through the main frame 10 and achieve directional transition. The multiple support rollers 20 are evenly arranged in an arc shape from the first opening 101 to the second opening 102. The support rollers 20 are rotatably connected to the main frame 10, and their surfaces abut against the outer surface of the cable. This provides support for the cable, reducing frictional loss between the cable and the main frame 10 during movement or transition, and the arc-shaped arrangement adapts to the cable's reversal requirements, guiding the cable smoothly through the cavity.

[0025] The limiting mechanism 30, as a core protective component, includes a trigger rod 31, a return spring 32, and a proximity switch 33. The return spring 32 is fixedly mounted on the main frame 10. The trigger rod 31 is rotatably connected to the main frame 10 via a rotating shaft. The first end of the trigger rod 31 is fixedly connected to the free end of the return spring 32, and this end is also set to the sensing end of the proximity switch 33 to trigger the on / off state of the proximity switch 33. The second end of the trigger rod 31 extends to the side of the cable and abuts against the outer surface of the cable. When the cable is in a normal bending state, the trigger rod 31 maintains its initial position under the elastic force of the return spring 32 and does not trigger the proximity switch 33. When the cable is excessively bent, the bent cable will generate a lateral thrust on the second end of the trigger rod 31, causing the trigger rod 31 to rotate around the rotating shaft, thereby bringing the first end of the trigger rod 31 closer to and triggering the proximity switch 33. After the cable returns to a normal bending state, the elastic force of the return spring 32 will push the trigger rod 31 to rotate in the opposite direction, returning it to its initial position and releasing the triggering of the proximity switch 33.

[0026] In existing technologies, cables are prone to excessive bending due to excessive bending angles and uneven stress during long-distance transmission or reversal, which can lead to breakage of the internal core wires or damage to the external sheath, affecting the normal use of the cable and even causing safety hazards. This solution effectively solves this technical problem by reasonably setting up the support rollers 20 and the limiting mechanism 30: multiple arc-shaped support rollers 20 can provide stable support and guidance for the cable, reduce the frictional resistance of the cable during the transition process, and prevent the cable from bending abnormally due to excessive local stress. At the same time, the limiting mechanism 30 can monitor the bending state of the cable in real time. When the cable bends excessively, the bent cable will push the trigger rod 31 to rotate. The first end of the trigger rod 31 triggers the proximity switch 33, which then sends a control signal to the cable equipment to stop the operation of the control equipment, thereby timely preventing the cable from being subjected to further stress and avoiding the cable from being pulled apart, thus achieving real-time protection of the cable.

[0027] Once the cable bend returns to normal, the reset spring 32 can quickly push the trigger rod 31 to reset, releasing the trigger on the proximity switch 33 and restoring the cable equipment to normal operation. This ensures the safe use of the cable without affecting the normal operating efficiency of the equipment. In addition, the entire device has a simple structure, is easy to install, and the components work together stably. It can adapt to cables of different specifications and has a wide range of applications. At the same time, through the combination of mechanical structure and electrical control components, it realizes automatic monitoring and protection of the cable bending state, reduces the cost of manual monitoring, and improves the safety and reliability of cable use.

[0028] The limiting mechanism 30 also includes a transition wheel 34, a return spring 32 mounted on the main frame 10, and a trigger rod 31 rotatably connected to the main frame 10. The first end of the trigger rod 31 is connected to the return spring 32 and can trigger the proximity switch 33. The second end of the trigger rod 31 is connected to the transition wheel 34, and the trigger rod 31 abuts against the cable through the transition wheel 34 to prevent direct contact with the cable and potential damage. When the cable is in a normal bending state, the trigger rod 31 maintains its initial position under the action of the return spring 32 and does not trigger the proximity switch 33. When the cable undergoes excessive bending, the bent cable pushes the transition wheel 34, thereby causing the trigger rod 31 to rotate around the main frame 10. The first end of the trigger rod 31 then triggers the proximity switch 33, which can control the cable equipment to stop operating. When the cable bend returns to normal, the return spring 32 drives the trigger rod 31 and the transition wheel 34 to reset, releasing the trigger on the proximity switch 33, and the equipment can resume normal operation.

[0029] Please see Figures 1 to 4 , Figure 3 This is a schematic diagram of the swing mechanism provided in this application. Figure 4 This is a schematic diagram of the three states of the swing mechanism provided in this application during the swinging process.

[0030] The core structure of the limiting reversing device of this application also includes a swing arm 40 and a swing frame 50. The main frame 10 has a cavity, and the swing arm 40 is disposed inside this cavity. The swing arm 40 is rotatably connected to the main frame 10, allowing the swing arm 40 to rotate flexibly around the connection point of the main frame 10, adapting to the bending and reversing requirements of the cable. The swing frame 50 is fixedly connected to the swing arm 40 and moves synchronously with the rotation of the swing arm 40. The swing frame 50 has a limiting hole 51 that penetrates it. The size of the limiting hole 51 is adapted to the cable specification and is specifically used for cable insertion. The limiting hole 51 constrains the cable, ensuring that the cable always stays within the preset trajectory during the reversing process, avoiding deviation, shaking, etc., thereby achieving smooth cable reversing and transmission.

[0031] This application, through the structural design of the swing arm 40, swing frame 50, and limiting hole 51, effectively solves the technical problem of cable deviation and swaying during the reversing process, leading to unstable reversing and easy wear, and achieves the technical effect of smooth cable reversing. In the prior art, there is a lack of effective limiting and guiding structures during cable reversing, which easily leads to deviation and swaying, not only affecting the reversing efficiency, but also causing friction between the cable and equipment components, aggravating cable wear. In this application, the swing arm 40 is rotatably connected to the main frame 10 and can rotate flexibly with the bending direction of the cable. The swing frame 50 moves synchronously with the swing arm 40, and the limiting hole 51 on the swing frame 50 precisely limits the cable, which can constrain the movement trajectory of the cable and prevent cable deviation and swaying.

[0032] Meanwhile, the limiting hole 51 provides a stable passage for the cable, reduces uneven stress during cable reversal, reduces friction loss between the cable and the equipment, ensures that the cable can complete the reversal smoothly and steadily, guarantees the stability and safety of cable transmission, and extends the service life of the cable.

[0033] Furthermore, this application optimizes and improves upon the above application. The limiting and reversing device also includes multiple guide wheels 80, which are rotatably connected to the opposite ends of the swing frame 50. A portion of the structure of each guide wheel 80 extends into the limiting hole 51. The wheel surface of the guide wheel 80 is in contact with the outer surface of the cable after it has been inserted. The guide wheel 80 can rotate flexibly with the movement or bending of the cable without affecting the normal transmission and reversing of the cable.

[0034] This application adds multiple guide wheels 80, further solving the technical problems of high frictional resistance, easy wear, and insufficient smooth reversing when the cable passes through the limiting hole 51, thus improving the practicality of the device and the protection effect on the cable. When the cable passes through the limiting hole 51, it is in direct contact with the inner wall of the limiting hole 51, resulting in high frictional resistance. Long-term use can easily lead to wear of the cable's outer sheath, affecting the cable's service life. In this application, the guide wheels 80, which are rotatably connected to the two ends of the swing frame 50, are partially inserted into the limiting hole 51. When the cable passes through, it contacts the wheel surface of the guide wheel 80, converting the sliding friction between the cable and the inner wall of the limiting hole 51 into the rolling friction of the guide wheel 80, which greatly reduces frictional resistance and reduces wear on the cable's outer sheath.

[0035] Meanwhile, the guide wheel 80 can rotate flexibly with the movement and bending of the cable, which can help the cable pass smoothly through the limiting hole 51, further constrain the movement trajectory of the cable, prevent the cable from getting stuck or deviating in the limiting hole 51, and make the cable reversal smoother. It not only continues the limiting effect of the first application, but also further improves the stability and safety of cable transmission and extends the service life of the cable and the device.

[0036] Furthermore, multiple support rollers 20 are symmetrically distributed on opposite sides of the swing arm 40, and the support rollers 20 and the swing arm 40 are spaced apart and do not directly contact each other. The support rollers 20 are only rotatably connected to the main frame 10. The wheel surface of the support rollers 20 faces the center direction of the swing arm 40 and is used to support the cable passing through the limit hole 51, providing auxiliary support and guidance for the cable and ensuring that the cable is subjected to balanced force during the reversal process.

[0037] This application effectively solves the technical problem of uneven force distribution and excessive bending during cable reversal, which can lead to cable breakage, by setting multiple support rollers 20 on opposite sides of the swing arm 40 at intervals. These support rollers 20 are rotatably connected only to the main frame 10. This achieves reliable cable protection and smooth reversal. In existing technologies, cable reversal relies solely on the constraint structure to limit the trajectory, which can easily lead to excessive force on one side, causing excessive bending and breakage of the cable. In this application, multiple support rollers 20 are symmetrically distributed on both sides of the swing arm 40 and do not directly contact the swing arm 40, but are rotatably connected only to the main frame 10. This allows for uniform support and restraint of the cable from opposite sides, ensuring balanced force distribution during reversal and preventing excessive force on one side.

[0038] The main frame 10 is provided with an arc-shaped swing groove 103. The arc of the arc-shaped swing groove 103 is adapted to the preset swing trajectory of the swing frame 50. The swing frame 50 is assembled inside the arc-shaped swing groove 103. The arc-shaped swing groove 103 plays a limiting and guiding role for the swing frame 50, which can strictly limit the swing trajectory of the swing frame 50 and prevent the swing frame 50 from deviating or misaligning during the rotation of the swing arm 40. This ensures that the swing frame 50 always swings along the preset arc trajectory, thereby ensuring the stability of the reversing trajectory of the cable passing through the limiting hole 51 of the swing frame 50.

[0039] Furthermore, the limiting and reversing device also includes a buffer block 91, which is fixedly connected to the main frame 10. Its installation position corresponds to the swing limit position of the swing arm 40. The abutting surface of the buffer block 91 faces the swing arm 40 and is used to abut the swing arm 40 when it swings to the limit position. The swing arm 40 can swing left and right along the extension direction of the arc swing groove 103. When the swing arm 40 swings to the limit position defined by the arc swing groove 103, the buffer block 91 contacts the swing arm 40 and generates a buffering force, thereby limiting the further swing of the swing arm 40. Since the swing frame 50 is connected to the swing arm 40 and the cable passes through the limiting hole 51 of the swing frame 50, after the swing of the swing arm 40 is limited, the further bending of the cable will also be limited synchronously, avoiding excessive bending of the cable.

[0040] This application effectively solves the technical problems of unstable swing trajectory of the swing frame 50 and excessive bending and breakage of the cable due to excessive swing of the swing arm 40 by adding an arc-shaped swing groove 103 and a buffer block 91 structure, thus achieving the dual technical effects of stable commutation and cable protection. Regarding the problem of unstable swing trajectory of the swing frame 50, the arc-shaped swing groove 103 on the main frame 10 is adapted to fit the swing frame 50. The arc-shaped swing groove 103 can precisely limit the swing trajectory of the swing frame 50, preventing the swing frame 50 from deviating or misaligning when rotating with the swing arm 40, ensuring that the swing frame 50 always moves along the preset arc-shaped trajectory, thereby ensuring the stability of the cable commutation trajectory, reducing stress disorder during cable commutation, and reducing cable wear.

[0041] To address the issue of excessive cable bending and breakage due to excessive swing of the swing arm 40, a buffer block 91 connected to the main frame 10 is set at the swing limit position of the swing arm 40. When the swing arm 40 swings to the left or right to its limit position, the buffer block 91 will promptly abut against the swing arm 40, using its own buffering effect to limit further swing of the swing arm 40, thereby limiting further bending of the cable and preventing the cable from being pulled apart due to excessive bending angle from the source. At the same time, the buffering effect of the buffer block 91 can also reduce rigid collisions between the swing arm 40 and the main frame 10, reduce component wear, and extend the service life of the device. In addition, the arc-shaped swing groove 103 and the buffer block 91 have a simple structure and are easy to assemble. They fit tightly with the original swing arm 40 and swing frame 50 structure without affecting the normal operation of the device, further improving the stability of the limit reversing device and the reliability of cable protection, ensuring that the cable is both smooth and safe during the reversing process.

[0042] The limit switching device of this application includes a forward switch 61 and a reverse switch 62, which are symmetrically arranged on opposite sides of the swing arm 40. Both are electrically connected to the cable winding mechanism, and their core function is to control the rotation direction of the cable winding mechanism to achieve automatic regulation of cable winding and unwinding. In actual operation, the swing arm 40 swings synchronously with the bending degree of the cable. When the cable pulls the swing arm 40 to swing to one side, the swing arm 40 will directly trigger the corresponding forward switch 61 or reverse switch 62.

[0043] When the forward switch 61 is triggered, it sends a control signal to the cable winding mechanism, controlling the cable winding mechanism to rotate in the forward direction, thereby releasing the cable. When the reverse switch 62 is triggered, it also sends a control signal to the cable winding mechanism, controlling the cable winding mechanism to rotate in the reverse direction, thereby winding the cable back. Through the linkage between the swing arm 40 and the switch triggering, the automatic control of cable winding and unwinding is realized.

[0044] This application, through the structural design of forward switch 61 and reverse switch 62, effectively solves the technical problem that cable winding cannot be automatically controlled according to the swing of the swing arm 40, requiring manual operation and resulting in low efficiency, thus achieving the technical effect of automatic control of cable winding. In the prior art, cable winding largely relies on manual observation of the swing state of the swing arm 40 and manual control of the winding mechanism. This is not only cumbersome and inefficient, but also prone to cable overstretching or bending damage due to untimely manual response. In this application, forward switch 61 and reverse switch 62 are symmetrically arranged on opposite sides of the swing arm 40 and electrically connected to the winding mechanism. When the swing arm 40 swings with the cable bending, the corresponding switch can be directly triggered without manual intervention, realizing automatic linkage control of cable winding and significantly improving operational efficiency. At the same time, after the switch is triggered, it can quickly control the winding mechanism to wind the cable forward or backward, adapting to the bending state of the cable in a timely manner, avoiding cable damage due to overstretching or bending, ensuring the safety of cable transmission, and improving the practicality and automation level of the device.

[0045] This application further adds a balance beam 70 to the previous application. The balance beam 70 is fixedly connected to the swing arm 40, and the balance beam 70 is symmetrically distributed with respect to the swing arm 40, ensuring that the balance beam 70 can swing synchronously and smoothly with the swing arm 40, avoiding deviation and skew. The top of the balance beam 70 is set as a plane, which corresponds to the trigger end of the forward switch 61 and the reverse switch 62 respectively, replacing the method of the swing arm 40 directly triggering the switch in the first application. When the swing arm 40 drives the balance beam 70 to swing to one side, the plane at the top of the balance beam 70 will contact the switch on the corresponding side and trigger the switch. This avoids damage to the switch caused by the swing arm 40 directly contacting the switch, and also ensures the stability and accuracy of the switch triggering. After triggering, the forward switch 61 controls the winding mechanism to unwind the cable in the forward direction, and the reverse switch 62 controls the winding mechanism to wind the cable in the reverse direction, realizing automatic control of cable winding and unwinding.

[0046] The limiting and reversing device of this application includes a protective roller 92, which is rotatably connected to the main frame 10. Its installation position corresponds to the first opening 101 and / or the second opening 102 on the main frame 10. That is, the protective roller 92 can be installed alone at the first opening 101, alone at the second opening 102, or both at both openings. The first opening 101 and the second opening 102 are channel ports on the main frame 10 for cable passage. The wheel surface of the protective roller 92 faces inward towards the port. When the cable passes through the first opening 101 and / or the second opening 102, the wheel surface of the protective roller 92 abuts against the outer surface of the cable. The protective roller 92 can rotate flexibly with the movement and reversal of the cable, without affecting the normal passage and transmission of the cable. Its core function is to protect the cable at the passage port and prevent direct contact between the cable and the port edge.

[0047] This application effectively solves the technical problem that when cables pass through the ports of the main frame 10, direct friction with the port edge can easily cause wear on the outer sheath of the cable and even damage to the internal core wires. By setting a protective roller 92 and assembling it at the first port 101 and / or the second port 102 of the main frame 10, this application achieves the technical effect of effectively protecting the cable and extending its service life. In the prior art, when the cable passes through the first port 101 and the second port 102 of the main frame 10, it is prone to rigid friction with the edge of the port. Long-term use will lead to wear and cracking of the cable outer sheath, which will damage the internal core wire and affect the normal transmission and service life of the cable. In this application, the protective roller 92 is rotatably connected to the main frame 10 and is located at the port to abut against the cable. It converts the sliding friction between the cable and the edge of the port into the rolling friction of the protective roller 92, which greatly reduces the frictional resistance and reduces the wear of the cable outer sheath. At the same time, the protective roller 92 can rotate synchronously with the movement and reversal of the cable, without obstructing the transmission of the cable, ensuring that the cable can pass through the port smoothly and steadily, and further ensuring the stability of the cable transmission. In addition, the protective roller 92 has a simple structure and is easy to assemble. It can be set at the first port 101, the second port 102 or both ports according to actual needs, adapting to different usage scenarios. Without affecting the overall function of the device, it effectively improves the device's protection capability for the cable and extends the service life of the cable and the device.

[0048] In the description of this specification, the references to terms such as "an application," "some applications," "example," "specific example," or "some examples," etc., mean that a specific feature, structure, material, or characteristic described in connection with that application or example is included in at least one application or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same application or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more applications or examples. Moreover, those skilled in the art can combine and integrate the different applications or examples described in this specification.

[0049] Furthermore, the technical solutions of each application can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0050] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A limiting and reversing device, characterized in that, include: The main frame has a cavity and a first and a second opening that communicate with both ends of the cavity. The first and second openings are used for cable routing. Multiple support rollers are arranged in an arc along the first opening to the second opening, and the multiple support rollers are used to hold the cable; The limiting mechanism includes a trigger rod, a reset spring, and a proximity switch. The reset spring is mounted on the main frame. The trigger rod is rotatably connected to the main frame. The first end of the trigger rod is connected to the reset spring and is used to trigger the proximity switch. The second end of the trigger rod is used to hold the cable.

2. The limiting and reversing device according to claim 1, characterized in that, The limiting mechanism also includes a transition wheel, which is connected to the second end of the trigger rod, and the trigger rod holds the cable through the transition wheel.

3. The limiting and reversing device according to claim 1, characterized in that, The limiting and reversing device includes a swing arm and a swing frame disposed in the cavity. The swing arm is rotatably connected to the main frame, and the swing frame is connected to the swing arm. The swing frame has a limiting hole for cable to pass through.

4. The limiting and reversing device according to claim 3, characterized in that, The limit reversing device includes a forward switch and a reverse switch, which are located on opposite sides of the swing arm and are used to trigger the forward switch or the reverse switch during the swing of the swing arm.

5. The limiting and reversing device according to claim 4, characterized in that, The limiting reversing device includes a balance beam with a flat top. The balance beam is connected to the swing arm and is symmetrical with respect to the swing arm. The flat surface is opposite to the forward switch and the reverse switch, respectively.

6. The limiting and reversing device according to claim 3, characterized in that, The limiting and reversing device includes multiple guide wheels, which are rotatably connected to the opposite ends of the swing frame and partially extend into the limiting hole.

7. The limiting and reversing device according to claim 3, characterized in that, Multiple rollers are symmetrically distributed on opposite sides of the swing arm.

8. The limiting and reversing device according to claim 3, characterized in that, The main frame has an arc-shaped swing groove, and the swing frame is assembled in the swing groove.

9. The limiting and reversing device according to claim 3, characterized in that, The limiting and reversing device includes a buffer block, which is connected to the main frame and is used to support the swing arm.

10. The limiting and reversing device according to claim 1, characterized in that, The limiting and reversing device includes a protective roller, which is rotatably connected to the main frame and located at the first opening and / or the second opening.

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