Rope drive power split silent telescoping cylinder

Abstract

This invention relates to the field of telescopic cylinder technology, and discloses a rope-driven, power-separated, silent telescopic cylinder, including a cylinder body, a screw, a rope bridge, a push rod, a central coupling, an external universal joint, and a synchronous belt reel. The cylinder body is a hollow cavity, with the screw rotatably mounted inside. One end of the push rod is connected to the rope bridge and extends into the cylinder body, while the other end extends outwards. One end of the screw extends outwards and is connected to the synchronous belt reel sequentially via the central coupling and the external universal joint. The screw has a double-ended helical groove, and the rope bridge is connected to the groove via two strands of rope, forming a closed-loop transmission around the cylinder body pulley. During operation, the drive motor drives the synchronous belt reel to rotate the screw in both directions, and the rope winding and unwinding drives the rope bridge and push rod to extend and retract. This device achieves power separation from the cylinder body, is lightweight, and offers flexible installation; the rope transmission provides good noise reduction, and the structure is simple and low-cost, making it suitable for civilian applications such as powered home appliances and medical beds / chairs.

Description

Technical Field

[0001] This invention relates to the field of telescopic cylinder technology, and in particular to a rope-driven, power-separated, silent telescopic cylinder. Background Technology

[0002] In existing technologies, telescopic cylinders mainly include three types: electric cylinders, pneumatic cylinders, and hydraulic cylinders. They are widely used in industrial and scientific research fields, but their promotion in civilian and high-end industrial segments is limited. The core drawbacks are as follows: Noise issues: Pneumatic cylinders generate approximately 60-80 dB of noise (exhaust sound + pneumatic vibration), requiring additional silencers; hydraulic cylinders generate approximately 55-75 dB of noise (hydraulic pump + oil flow sound), relying on sound insulation measures; even the quietest electric cylinders still produce 40-60 dB of motor / lead screw friction noise. Especially in multi-axis parallel robot platforms, where six telescopic cylinders work simultaneously, the combined noise far exceeds industry standards. Currently, there is no mature domestic technology to solve this multi-cylinder noise problem, severely limiting the application of parallel robots in low-noise environments such as indoor spaces, medical settings, and precision assembly.

[0003] Cost and compatibility issues: Electric cylinders require servo motors, drivers, and ball screws, resulting in high initial investment; hydraulic cylinder systems are complex, with pumps, valves, and hydraulic fluids being expensive; and existing telescopic cylinders have their drive motors fixed to the cylinder body, with the motor moving synchronously with the cylinder body, resulting in a large overall size and heavy weight, making them unsuitable for parallel robot platforms and the requirements of civilian products for lightweight and miniaturized equipment.

[0004] Limitations in adaptability: The integrated structure of the motor and cylinder limits the installation and range of motion of the telescopic cylinder, making it difficult to adapt to the multi-degree-of-freedom layout of parallel robot platforms and the diverse installation scenarios and operating conditions of civilian products.

[0005] The aforementioned defects prevent existing telescopic cylinders from being widely used in civilian products, and they also fail to meet the core requirements of low noise and high load capacity in high-end industrial scenarios such as parallel robots. Therefore, there is an urgent need for a telescopic cylinder technology that is quiet, has a strong load capacity, is low in cost, lightweight, and has wide adaptability. Summary of the Invention

[0006] In view of this, the present invention aims to provide a rope-driven, power-separated, silent telescopic cylinder to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial alternative.

[0007] The technical solution of this invention is implemented as follows: A rope-driven, power-separated, silent telescopic cylinder includes a cylinder body, a screw, a rope bridge, a push rod, a central coupling, an external universal joint, and a synchronous pulley. The cylinder body has a hollow cavity structure. The screw is rotatably installed inside the cylinder body. One end of the push rod extends into the cylinder body and is fixedly connected to the rope bridge, while the other end extends out of the cylinder body. One end of the screw extends to the outside of the cylinder body and is fixedly connected to the synchronous pulley in sequence through a central coupling and an external universal joint. The synchronous pulley is used to drive an external motor. The screw has three independent spiral grooves on its outer circumference. The groove depth can fully accommodate the corresponding rope. The rotation direction of a single spiral groove can be set to clockwise or counterclockwise as needed, without the need to set both directions simultaneously. The rope bridge is connected to the three spiral grooves by three closed-loop high-molecular polyethylene ropes. One end of the rope is fixed in the corresponding spiral groove, and the other end passes through the rope bridge, goes around the pulley at one end of the cylinder, and is then fixed to the rope bridge. The screw rotates in both directions to drive a single rope to complete the winding and unwinding action in the same groove. The three ropes simultaneously bear the force to drive the rope bridge and push rod to perform telescopic movements. At least one guide rod is fixed axially on the inner wall of the cylinder. A groove adapted to the guide rod is provided on the outer periphery of the rope bridge. The guide rod is embedded in the groove to limit the circumferential rotation of the rope bridge. A magnetic grating ruler or optical grating ruler is installed on the guide rod, and a corresponding reading head is installed on the rope bridge to detect the axial position of the rope bridge in real time and output position data. A brake locking device is integrated on the rope bridge to lock the relative position of the rope bridge and the guide rod to prevent the push rod from slipping.

[0008] Preferably, the two ends of the rope are fixed to the corresponding spiral groove of the screw and the fixing hole of the rope bridge by crimping components. The rope bridge is provided with rope guide holes corresponding to the three ropes. After the rope passes through the guide holes, it forms an independent closed-loop transmission structure with the pulley at one end of the cylinder. When the screw rotates forward, the front section of the rope in a single spiral groove is wound in and the rear section is simultaneously ejected. When the screw rotates in reverse, the rope moves in the opposite direction. The three ropes move in sync to achieve smooth driving of the rope bridge.

[0009] Preferably, one end of the cylinder is fixed with three sets of independent pulleys by bolts, each corresponding to one of the three ropes. The pulleys are made of engineering plastic and are used to guide the ropes and reduce transmission friction noise.

[0010] Preferably, the central coupling is a flexible coupling, used to compensate for the installation coaxiality error between the screw and the external universal joint, thereby achieving flexible transmission.

[0011] Preferably, the external universal joint is a cross-shaped universal joint, with one end fixed to the central coupling and the other end fixedly connected to the synchronous pulley via a flat key, thereby realizing flexible power transmission.

[0012] Preferably, the synchronous slave belt reel and the driving belt reel of the external drive motor are connected by a transmission belt, and the number of teeth of the synchronous slave belt reel is adapted to the number of teeth of the driving belt reel, with a transmission ratio of 1:1-1:3.

[0013] Preferably, the diameter of the high molecular weight polyethylene rope is 2-6mm, the rated tensile strength of a single rope is ≥15kN, and the overall output thrust can reach more than 45kN when three ropes are under the same load.

[0014] Preferably, the cylinder body and push rod are both made of aluminum alloy, the screw is made of 45 steel, and the rope bridge is made of high-strength engineering plastic in one piece, achieving a lightweight design.

[0015] Preferably, the screw is rotatably mounted inside the cylinder via a silent deep groove ball bearing, and the outer diameter of the push rod is adapted to the inner diameter of the cylinder to ensure the coaxiality and smoothness of the telescopic movement.

[0016] Preferably, the brake locking device is an electromagnetic locking device, which automatically locks the guide rod when power is lost and releases it when power is restored to allow the rope bridge to move axially; the detection accuracy of the magnetic grating ruler or optical grating ruler is ≤0.01mm, and it can be linked with an external control system to achieve high-precision closed-loop control of the push rod position.

[0017] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions: I. Significantly quiet operation: The flexible transmission structure of rope and screw replaces the traditional ball screw transmission of electric cylinder, the pneumatic transmission of air cylinder, and the hydraulic transmission of hydraulic cylinder, greatly reducing the noise generated by mechanical friction. The noise of a single cylinder can be lower than 38dB, and the cumulative noise of six cylinders running in parallel can still be controlled within 45dB. This completely solves the multi-cylinder noise problem of parallel robot platforms and meets the quiet operation requirements of civilian products.

[0018] II. Significantly Improved Load Capacity: The use of a three-slot screw combined with three synchronously load-bearing high-molecular-weight polyethylene ropes increases the overall output thrust by more than 50% compared to the dual-rope structure, reaching a maximum of 45kN, which can meet the usage requirements of parallel robot platforms and various medium-to-high load scenarios.

[0019] III. Lightweight and Miniaturized: The cylinder and drive motor are separated by an external universal joint, a central coupling, and a synchronous pulley. The drive motor does not need to move with the cylinder, which greatly reduces the size and weight of the cylinder and the overall equipment. It is suitable for the multi-degree-of-freedom layout of parallel robot platforms and the lightweight and miniaturized installation requirements of civilian products.

[0020] IV. Controllable Costs: The simplified structure eliminates the need for servo motors, drivers, ball screws, or complex hydraulic / pneumatic systems. Core components include only cylinders, screws, ropes, and rope bridges, reducing initial investment costs and facilitating promotion in both civilian and industrial niche markets.

[0021] V. Wide adaptability to working conditions: The power source is separated from the cylinder block, and with the flexible transmission of the external universal joint, the installation position of the cylinder block is not limited by the drive motor, which can adapt to the diverse installation needs of parallel robot platforms, powered home appliances, medical beds and chairs and other scenarios.

[0022] VI. Significantly Improved Control Precision and Safety: The newly added guide rod anti-rotation structure completely avoids jamming and offset caused by the circumferential rotation of the rope bridge; the integrated magnetic grating ruler / optical grating ruler position detection system enables high-precision closed-loop control of the push rod position; equipped with a brake locking device, the push rod can be locked at any position, effectively preventing the risk of slippage during power failure or sudden load changes, and ensuring the safe operation of the equipment.

[0023] VII. Stable and reliable transmission: The synchronous cooperation of three independent spiral grooves and three ropes ensures the smoothness of the push rod's extension and retraction movement, with no crawling phenomenon. In addition, the high molecular weight polyethylene rope has excellent wear resistance, low maintenance cost, and long service life.

[0024] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a structural diagram from another perspective of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional structural diagram from another perspective of the present invention.

[0027] Reference numerals in the attached diagram: 1-Push rod, 2-Cylinder block, 3-Rope bridge, 4-Screw, 5-Center coupling, 6-Universal joint, 7-Synchronous pulley. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features. In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the accompanying drawings and specific circumstances.

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] like Figure 1-4 As shown, the present invention provides a rope-driven, power-separated, silent telescopic cylinder, characterized in that it includes a cylinder body 2, a screw 4, a rope bridge 3, a push rod 1, a central coupling 5, an external universal joint 6, and a synchronous pulley 7; The components work together to form the core architecture of "power separation + three-rope synchronous transmission + high-precision position control". This not only breaks the design limitations of the traditional telescopic cylinder with integrated power and cylinder body, but also achieves a double leap in quietness and load-bearing capacity through multi-rope flexible transmission. At the same time, it solves the problems of multi-cylinder noise and high-precision control in parallel robot platforms.

[0032] The cylinder body 2 has a hollow cavity structure. The screw 4 can be rotatably installed inside the cylinder body 2. One end of the push rod 1 extends into the cylinder body 2 and is fixedly connected to the rope bridge 3, while the other end extends out of the cylinder body 2. The hollow cavity of cylinder 2 provides a closed operating space for screw 4 and rope bridge 3, preventing external impurities from entering and reducing the outward diffusion of transmission noise. The rigid fixation of push rod 1 and rope bridge 3 ensures lossless power transmission and improves the response accuracy of telescopic motion.

[0033] One end of the screw 4 extends to the outside of the cylinder 2 and is fixedly connected to the synchronous pulley 7 via the central coupling 5, the external universal joint 6, and the synchronous pulley 7, which is used to drive the external drive motor. The design of the extended end of the screw 4 is the key structure to achieve "power separation": through the connection of the central coupling 5 and the external universal joint 6, the drive motor can be installed independently at a position away from the cylinder 2 without having to move synchronously with the cylinder 2. This design greatly reduces the overall weight of the cylinder 2, while expanding the freedom of installation layout of the telescopic cylinder in the multi-degree-of-freedom layout of the parallel robot platform and in civilian scenarios.

[0034] The outer circumference of the screw 4 has three independent spiral grooves. The groove depth is designed to fully accommodate the corresponding rope, preventing the rope from protruding from the groove and causing additional friction and noise. The rotation direction of a single spiral groove can be uniformly set to clockwise or counterclockwise according to installation requirements, without the need to set both directions simultaneously. The rope bridge 3 is connected to the three spiral grooves by three closed-loop high-molecular polyethylene ropes. Each rope corresponds to an independent spiral groove. One end of the rope is fixed to the starting end of the corresponding spiral groove by a metal crimping piece, and the other end passes through the corresponding guide hole on the rope bridge 3, and then passes around the rope bridge pulley on the rope bridge 3, the upper fixed pulley at the top of the cylinder 2, and the lower fixed pulley at the bottom in sequence. Finally, it is fixed back into the fixing hole of the rope bridge 3 by the crimping piece, forming an independent closed-loop transmission structure.

[0035] When screw 4 rotates in both directions, each rope completes a synchronized "front section winding in, rear section unwinding" motion within the same slot. All three ropes bear force simultaneously and work in sync, pulling rope bridge 3 to extend and retract along the axis of cylinder 2. Compared to a dual-rope structure, the three-rope synchronous transmission results in more even force distribution on rope bridge 3, increasing overall load-bearing capacity by over 50%, and completely eliminating the risk of equipment failure due to single-rope breakage.

[0036] Two guide rods are symmetrically fixed on the inner wall of the cylinder 2 along the axial direction. Two arc-shaped grooves that match the guide rods are provided on the outer periphery of the rope bridge 3. The guide rods are embedded in the grooves to form a sliding fit, which can completely restrict the rope bridge 3 from rotating with the screw 4 and ensure that the rope bridge 3 can only move smoothly along the axial direction, fundamentally solving the torsional jamming problem that is prone to occur in traditional rope drive structures.

[0037] A magnetic scale is mounted axially on the side of one of the guide rods, and a magnetic reading head is fixed at the corresponding position on the rope bridge 3. The gap between the reading head and the magnetic scale is controlled within the range of 0.5-1mm, which can detect the axial position of the rope bridge 3 in real time with a detection accuracy of up to 0.01mm. The position data is then output to an external control system to achieve high-precision closed-loop control of the push rod 1. Depending on the accuracy requirements, the magnetic scale can also be replaced with an optical scale.

[0038] The side of the rope bridge 3 integrates an electromagnetic brake locking device, with the jaws of the locking device facing another guide rod. When the equipment is powered off or when a locking position is required, the brake locking device automatically clamps the guide rod when de-energized, completely locking the relative position of the rope bridge 3 and the guide rod, effectively preventing the push rod 1 from slipping under load; when telescopic movement is required, the brake locking device is energized and released, allowing the rope bridge 3 to move freely along the guide rod.

[0039] In this embodiment, specifically, one end of the cylinder 2 is fixed with three independent pulley assemblies by bolts. Each pulley assembly includes an upper fixed pulley and a lower fixed pulley, which correspond to three ropes respectively. All pulleys are made of engineering plastics with low coefficient of friction such as POM or UHMWPE. The matching gap between the pulley groove and the rope diameter is controlled at 0.2-0.5mm. Compared with metal pulleys, the friction noise between the rope and the pulley can be reduced by more than 40%, while avoiding wear on the rope surface.

[0040] The central coupling 5 is a flexible coupling, used to compensate for the installation coaxiality error between the screw 4 and the external universal joint 6, so as to achieve flexible transmission; The elastic element of the flexible coupling is made of polyurethane, which has good buffering and vibration reduction performance. The allowable coaxiality compensation error is ≤0.2mm. It can not only eliminate the transmission impact caused by installation errors, but also absorb the speed fluctuation of the drive motor, making the rotation of screw 4 more stable and further reducing operating noise.

[0041] The external universal joint 6 is a cross-shaft universal joint, with one end fixed to the central coupling 5 and the other end fixedly connected to the synchronous pulley 7 via a flat key, thus realizing flexible power transmission. The needle roller bearing of the cross shaft universal joint adopts a sealed structure and is pre-filled with silent grease. It can flexibly transmit power within a swing angle range of up to 30°, making the installation angle of the drive motor and cylinder 2 more flexible, while preventing dust from entering the bearing and extending the service life of the universal joint.

[0042] The synchronous driven belt pulley 7 engages with the driving belt pulley of the external drive motor via a transmission belt. The number of teeth on the synchronous driven belt pulley 7 is matched with that on the driving belt pulley, and the transmission ratio is 1:1 to 1:3. The synchronous driven belt pulley 7 is made of aluminum alloy, and the transmission belt is a polyurethane synchronous belt. The aluminum alloy pulley is lightweight while ensuring strength, and the polyurethane synchronous belt has high transmission accuracy and no risk of slippage, making the output speed of the telescopic cylinder more stable.

[0043] In this embodiment, the rope is made of ultra-high molecular weight polyethylene (UHMWPE), which has advantages such as high strength, light weight, wear resistance, corrosion resistance, and low noise. The diameter is 2-6mm, and the rated tensile strength of a single rope is ≥15kN. When three ropes are simultaneously bearing load, the overall output thrust can reach over 45kN. Users can flexibly choose the rope diameter according to actual load requirements, ensuring transmission reliability while avoiding cost waste due to over-design.

[0044] The cylinder body 2 and push rod 1 are both made of aluminum alloy, the screw 4 is made of 45 steel, and the rope bridge 3 is made of high-strength engineering plastic in one piece to achieve a lightweight design. The cylinder body 2 and push rod 1 are made of 6061 aluminum alloy and are anodized to improve surface hardness; the screw 4 is made of 45 steel and is heat-treated. The overall structure weight is reduced by more than 40% compared with traditional steel telescopic cylinders, which facilitates the installation and handling of parallel robot platforms and civilian products. At the same time, aluminum alloy has better corrosion resistance and is suitable for humid home and medical environments.

[0045] The screw 4 is rotatably mounted inside the cylinder 2 via a silent deep groove ball bearing. The outer diameter of the push rod 1 is matched with the inner diameter of the cylinder 2 to ensure the coaxiality and smoothness of the telescopic movement.

[0046] The radial clearance of the silent deep groove ball bearing is controlled at 0.01-0.03mm, and the fit clearance between the push rod 1 and the cylinder 2 is ≤0.05mm. The extremely small clearance and fit clearance ensure that the rotation of the screw 4 is free from radial wobble and the extension and retraction of the push rod 1 is free from offset, thus ensuring the coaxiality of the extension and retraction movement and improving the stability during load operation.

[0047] Working principle of the invention The working process of this device follows the logic of "power input - screw rotation - rope synchronous transmission - rope bridge movement - push rod extension and retraction", and the specific steps are as follows: Power input: An external drive motor drives the synchronous pulley 7 to rotate clockwise (if it rotates counterclockwise, the push rod moves in the opposite direction). The power is transmitted to the synchronous pulley 7 without loss through the synchronous belt drive. Synchronous rotation of the screw: The central screw 4 is driven to rotate clockwise synchronously from the pulley 7 through the external universal joint 6 and the central coupling 5. The flexible transmission of the universal joint and the flexible coupling can absorb installation errors and vibrations, further reducing noise. Synchronous winding and unwinding of ropes: When screw 4 rotates clockwise, the three independent spiral grooves move synchronously. The front section of each rope is gradually wound into the corresponding groove, and at the same time, the rear section of the rope is synchronously unwinding from the same groove. The three ropes generate an upward pulling force at the same time. The rope bridge and the push rod move synchronously: the tension of the three ropes acts on the rope bridge 3 together, pulling the rope bridge 3 to move smoothly upward along the guide rod. Since the rope bridge 3 and the push rod 1 are rigidly fixed, the push rod 1 is then driven to extend upward. Position locking and control: When push rod 1 reaches the target position, the external control system sends a command, the brake locking device loses power and clamps the guide rod, locking the position of rope bridge 3; at the same time, the magnetic scale and reading head provide real-time feedback of position data, realizing high-precision closed-loop control.

[0048] When push rod 1 needs to retract, simply control the external drive motor to rotate counterclockwise and repeat the above steps. The rope will be wound in and out in the opposite direction, pulling rope bridge 3 downward and causing push rod 1 to retract smoothly. By adjusting the output speed of the external drive motor, combined with the transmission ratio (1:1-1:3) between the synchronous driven pulley 7 and the driving pulley, the extension and retraction speed of push rod 1 can be adjusted as needed (the adjustment range can reach 0.01-0.5m / s).

[0049] In summary, this device completely solves the core pain points of existing technologies: through three-rope synchronous flexible transmission, it achieves an extremely quiet effect with single-cylinder noise ≤38dB and six-cylinder parallel noise ≤45dB, while increasing the load-bearing capacity to over 45kN; the power separation design significantly reduces cylinder weight and installation limitations; the integration of guide rod anti-rotation, high-precision position detection, and brake locking devices significantly improves the control accuracy and operational safety of the equipment, perfectly adapting to the needs of parallel robot platforms, powered home appliances, medical beds and chairs, and other scenarios.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A rope-driven, power-separated, silent telescopic cylinder, characterized in that, It includes a cylinder block (2), a screw (4), a rope bridge (3), a push rod (1), a central coupling (5), an external universal joint (6), and a synchronous pulley (7); The cylinder (2) has a hollow cavity structure. The screw (4) is rotatably installed inside the cylinder (2). One end of the push rod (1) extends into the cylinder (2) and is fixedly connected to the rope bridge (3), while the other end extends out of the cylinder (2). One end of the screw (4) extends to the outside of the cylinder (2) and is fixedly connected to the synchronous pulley (7) in sequence through the central coupling (5) and the external universal joint (6). The synchronous pulley (7) is used to drive the external drive motor. The screw (4) has three independent spiral grooves on its outer circumference. The groove depth can fully accommodate the corresponding rope. The direction of rotation of a single spiral groove can be set to clockwise or counterclockwise as needed, without the need to set both directions simultaneously. The rope bridge (3) is connected to the three spiral grooves by three closed-loop high-molecular polyethylene ropes. One end of the rope is fixed in the corresponding spiral groove, and the other end passes through the rope bridge (3), passes around the pulley at one end of the cylinder (2), and is then fixed to the rope bridge (3). The screw (4) rotates in both directions to drive a single rope to complete the winding and unwinding action in the same groove. The three ropes simultaneously bear the force to drive the rope bridge (3) and the push rod (1) to perform telescopic movements. At least one guide rod is fixed axially on the inner wall of the cylinder (2). The outer periphery of the rope bridge (3) is provided with a groove that matches the guide rod. The guide rod is embedded in the groove to limit the circumferential rotation of the rope bridge (3). A magnetic grating ruler or optical grating ruler is installed on the guide rod. A corresponding reading head is installed on the rope bridge (3) to detect the axial position of the rope bridge (3) in real time and output position data. A brake locking device is integrated on the rope bridge (3) to lock the relative position of the rope bridge (3) and the guide rod to prevent the push rod (1) from slipping.

2. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The two ends of the rope are respectively fixed in the corresponding spiral groove of the screw (4) and the fixing hole of the rope bridge (3) by crimping parts. The rope bridge (3) is provided with rope guide holes corresponding to the three ropes. After the rope passes through the guide hole, it forms an independent closed-loop transmission structure with the pulley at one end of the cylinder (2). When the screw (4) rotates forward, the front section of the rope in the single spiral groove is wound in and the rear section is simultaneously ejected. When the screw (4) rotates in reverse, it moves in the opposite direction. The three ropes work together synchronously to achieve smooth driving of the rope bridge (3).

3. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, One end of the cylinder (2) is fixed with three independent pulleys by bolts, which correspond to three ropes respectively. The pulleys are made of engineering plastic material and are used to guide the ropes and reduce transmission friction noise.

4. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The central coupling (5) is an elastic coupling used to compensate for the installation coaxiality error between the screw (4) and the external universal joint (6) to achieve flexible transmission.

5. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The external universal joint (6) is a cross-shaped universal joint, with one end fixed to the central coupling (5) and the other end fixedly connected to the synchronous pulley (7) via a flat key, thereby realizing flexible power transmission.

6. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The synchronous slave belt reel (7) is engaged with the driving belt reel of the external drive motor via a transmission belt. The number of teeth of the synchronous slave belt reel (7) is adapted to the number of teeth of the driving belt reel, and the transmission ratio is 1:1-1:

3.

7. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The high-molecular-weight polyethylene rope has a diameter of 2-6mm, a rated tensile strength of ≥15kN for a single rope, and an overall output thrust of over 45kN when three ropes are under the same load.

8. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The cylinder body (2) and push rod (1) are both made of aluminum alloy, the screw (4) is made of No. 45 steel, and the rope bridge (3) is made of high-strength engineering plastic in one piece to achieve lightweight design.

9. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The screw (4) is rotatably mounted inside the cylinder (2) via a silent deep groove ball bearing. The outer diameter of the push rod (1) is adapted to the inner diameter of the cylinder (2) to ensure the coaxiality and stability of the telescopic movement.

10. The rope-driven, power-separated, silent telescopic cylinder according to claim 1, characterized in that, The brake locking device is an electromagnetic locking device. When power is lost, it automatically locks the guide rod to achieve position locking. When power is restored, it releases to allow the rope bridge (3) to move axially. The detection accuracy of the magnetic grating ruler or optical grating ruler is ≤0.01mm. It can be linked with the external control system to achieve high-precision closed-loop control of the push rod (1).

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