Height and span adjustable cable structure reduced scale model tensioning device

Abstract

The invention discloses an adjusting device for a traction cable tensioning process in a cable structure reduced scale model test, which comprises a hydraulic lifting platform, a shear type supporting arm of the hydraulic lifting platform is connected with a base and a top frame, and a sliding groove and two hydraulic rods are arranged in the base; the hand-cranking capstan is borne on a top frame of the hydraulic lifting platform and is provided with two parallel capstan bodies connected through a telescopic sleeve, the two parallel capstan bodies are fixed to the two flat plates respectively, the telescopic sleeve is wound with a steel wire rope with a lifting hook, and the capstan body on one side is provided with a self-locking type manual rotating mechanism; the length telescoping mechanism is installed between the two flat plates of the hand-cranking capstan and is provided with two gear boxes and a transmission mechanism, and a transmission rod is arranged between the gear boxes. The device has the function of bidirectional adjustment of height and span, can meet the tensioning requirements of cable bodies at different spatial positions in a cable structure reduced scale model test, and is high in flexibility, time-saving and labor-saving.

Description

Technical Field

[0001] This invention relates to the field of cable structures and structural engineering, and in particular to a construction tensioning device for cables during scaled-down model testing of cable structures. Background Technology

[0002] Cable structures, as a type of flexible structure, are widely used in various large-span building structures due to their advantages such as lightweight, high efficiency, and ability to achieve large spans. These structures mainly include cable net structures, cable trusses, and cable domes. These structures achieve the necessary structural stiffness by applying prestress to the cables; therefore, prestressing design and construction techniques have a decisive impact on structural performance. For some important cable structures, to ensure accurate realization of the design shape and internal force distribution during actual construction, scaled-down model tests are usually required before formal construction to verify the feasibility of the tensioning scheme.

[0003] However, cable structures generally have large spans, heavy weights, and sometimes require simultaneous tensioning of multiple cables, posing significant challenges to tensioning equipment, tooling, and control. Currently, there is a lack of suitable tensioning equipment for scaled-down cable structure models. Relying solely on manual lifting is not only time-consuming and labor-intensive but also difficult to control in terms of lifting accuracy. Therefore, we propose a tensioning device for scaled-down cable structure models with adjustable height and span to improve experimental efficiency and control accuracy. Summary of the Invention

[0004] This invention provides a tensioning device for a cable structure scaled-down model with adjustable height and span to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a tensioning device for a cable structure scaled-down model with adjustable height and span, comprising:

[0006] A hydraulic lifting platform, wherein the scissor support arm of the hydraulic lifting platform connects the base and the top frame, and the base is provided with a sliding groove and two hydraulic rods inside;

[0007] A hand-cranked winch is mounted on the top frame of a hydraulic lifting platform. It has two parallel winches connected by a telescopic sleeve and fixed on two flat plates. The telescopic sleeve is wound with a steel wire rope with a hook. One of the winches is equipped with a self-locking manual rotation mechanism.

[0008] The length telescopic mechanism is installed between two flat plates of a hand-cranked winch and is equipped with two gearboxes and a transmission mechanism, with a transmission rod between the gearboxes.

[0009] The scissor arms are connected by a cross-pin. The base has sliding grooves on both sides. Two hydraulic rods are located in the middle of the sliding grooves. One end of each hydraulic rod is connected to a lower round rod that can slide in the sliding groove, and the other end is connected to a round rod fixed in the sliding groove. The two lower round rods are connected to the lower ends of the scissor arms. The top frame has upper sliding grooves on both sides. The groove ends are provided with limiting grooves. A movable round rod is provided in the limiting groove. The sliding round rod is connected to the upper end of the scissor arms.

[0010] The winch and the telescopic sleeve form an integral structure, which is mounted on two flat plates via a telescopic fixed shaft. The integral structure consisting of the telescopic sleeve and the winch is used to wind a steel wire rope with a hook. The two winches have through holes on their sides for the steel wire rope to pass through.

[0011] The self-locking manual transmission mechanism includes an input component, a transmission component, and a self-locking component. The input component includes a handle and a rocker arm hinged by a pin, and the rocker arm is fixedly connected to the drive shaft by bolts. The transmission component includes a drive gear fixed on the drive shaft and a driven gear coaxially arranged with the telescopic fixed shaft and meshing with the drive gear. The self-locking component is a limiter disposed on the side of the drive gear.

[0012] The limiter is a pawl that cooperates with the drive gear. The pawl is connected to the operating handle via a spring. The pawl, spring, and operating handle form a whole and are fixed to the plate on which the winch is installed by a cover plate and bolts.

[0013] The two gearboxes of the telescopic mechanism are fixed in the sliding grooves of the winch support, and the two gearboxes are connected by a transmission rod. A rotating handle is provided on one side of each gearbox, and a rotating shaft is provided inside the gearbox. The rotating handle is connected to the rotating shaft of the gearbox, and a transmission gear is provided on the rotating shaft. A telescopic rod is connected below the gearbox, and a lead screw is provided inside the telescopic rod. A driven gear is fixed at the top of the lead screw, and the driven gear meshes with the transmission gear. The lower end of the telescopic rod extends into a fixed round rod, and a fixing nut is provided inside the fixed round rod. The end of the lead screw extends out of the bottom of the telescopic rod and is screwed into the fixing nut.

[0014] Both the telescopic rod and the fixed round rod are housed in the sliding groove of the winch support, and the fixed round rod is fixed to one of the flat plates.

[0015] The beneficial effects of this invention are:

[0016] The present invention provides a tensioning device for a cable structure scale-down model with adjustable height and span. It uses a hand-cranked winch for raising and lowering the traction cable and integrates a self-locking manual transmission mechanism, making the tensioning process more convenient and labor-saving and effectively preventing the traction cable from accidentally retracting due to external force or vibration during the tensioning process, thus significantly improving the safety and stability of the test process.

[0017] This device integrates independent adjustment functions for the overall working height, working span between the two winches, and length of the traction cable through the coordinated configuration of a hydraulic lifting platform, a length extension mechanism, and a hand-cranked winch. This design enables the device to quickly adapt to the tensioning requirements of cables at different spatial positions and angles in scaled-down models of cable structures, solving the problems of single equipment positioning and poor adaptability in existing technologies. Furthermore, by using multiple devices, simultaneous tensioning of multiple cables can be achieved. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of a tensioning device for a scaled-down model of a cable structure with adjustable height and span.

[0019] Figure 2 This is a structural diagram of a hydraulic lifting platform for a tensioning device of a scaled-down model of a cable structure with adjustable height and span.

[0020] Figure 3 This is a diagram of a hand-cranked winch structure for a tensioning device of a scaled-down model of a cable structure with adjustable height and span.

[0021] Figure 4 This is a structural diagram of a self-locking manual transmission mechanism for a tensioning device of a scaled-down model of a cable structure with adjustable height and span.

[0022] Figure 5 This is a structural diagram of the limiter of a tensioning device for a scaled-down model of a cable structure with adjustable height and span.

[0023] Figure 6 This is a structural diagram of the length extension mechanism of a tensioning device for a cable structure with adjustable height and span.

[0024] Numbered in the diagram: 1. Hydraulic lifting platform; 101. Base; 102. Top frame; 103. Scissor arm; 104. Pin; 105. Sliding groove; 106. Limiting groove; 107. Hydraulic rod; 108. Lower round rod; 109. Sliding round rod; 2. Hand-cranked winch; 201. Winch support; 202. Winch; 203. Telescopic sleeve; 204. Telescopic fixed shaft; 205. Steel wire rope; 206. Through hole; 207. Flat plate; 208. Handle; 209. Crank; 21 0. Bolt; 211. Drive shaft; 212. Drive gear; 213. Driven gear; 3. Self-locking manual rotation mechanism; 4. Limit switch; 401. Pawl; 402. Spring; 403. Operating handle; 404. Cover plate; 5. Length telescopic mechanism; 501. Gearbox; 502. Transmission rod; 503. Rotary handle; 504. Rotating shaft; 505. Transmission gear; 506. Driven gear; 507. Lead screw; 508. Telescopic rod; 509. Fixed round rod; 510. Fixed nut. Detailed Implementation

[0025] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention will be described in detail, clearly, and completely below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Furthermore, based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present invention.

[0026] In the description of the examples in this application, it should be noted that the terms "upper", "lower", "inner", "one side", "the other side", etc., are based on the positional relationship shown in the accompanying drawings, and are only used to describe the examples in this application more clearly, rather than requiring the parts referred to to have a specific orientation.

[0027] Please see Figures 1-6 This application provides a tensioning device for a scaled-down model of a cable structure with adjustable height and span, comprising:

[0028] The hydraulic lifting platform 1 has a scissor support arm 103 that connects the base 101 and the top frame 102, and the base is provided with a sliding groove 105 and two hydraulic rods 107.

[0029] The hand-cranked winch 2 is supported on the top frame of the hydraulic lifting platform. Two parallel winches 202 connected by a telescopic sleeve 203 are set and fixed on two flat plates 207 respectively. The telescopic sleeve 203 is wound with a steel wire rope 205 with a hook. One of the winches is equipped with a self-locking manual rotation mechanism 3.

[0030] The length telescopic mechanism 5 is installed between two flat plates 207 of the hand-cranked winch and is equipped with two gearboxes 401 and a transmission mechanism. A transmission rod 502 is provided between the gearboxes.

[0031] like Figure 2 As shown: The scissor support arms 103 are connected by pins 104. The base 101 has sliding grooves 105 on both sides inside. Two hydraulic rods 107 are provided in the middle of the sliding grooves 105. One end of the two hydraulic rods 107 is connected to a lower round rod 108 that can slide in the sliding groove 105, and the other end is connected to a round rod fixed in the sliding groove 105. The two lower round rods 108 are connected to the lower end of the scissor support arm. The top frame 102 has upper sliding grooves 105 on both sides inside. The groove end is provided with a limiting groove 106. A sliding round rod 109 is provided in the limiting groove. The sliding round rod is connected to the upper end of the scissor support arm.

[0032] In use, the synchronous extension and retraction of the two hydraulic rods 107 pushes the lower round rod 108 to move along the sliding groove of the base 101, driving the scissor support arm 103 to rotate around the pin 104, thereby realizing the smooth lifting and lowering of the top frame 102 and its upper structure, completing the stepless adjustment of the working height of the device, thus meeting the tensioning of the cable at different heights.

[0033] like Figures 3-5 As shown: The winch 202 and the telescopic sleeve 203 form an integral structure, which is mounted on two flat plates 207 through a telescopic fixed shaft 204. The integral structure formed by the telescopic sleeve 203 and the winch 202 is used to wind the steel wire rope 205 with hooks. The two winches 202 have through holes 206 on their sides for the steel wire rope to pass through.

[0034] The self-locking manual transmission mechanism 3 includes an input component, a transmission component, and a self-locking component. The input component includes a handle 208 and a rocker arm 209 hinged together by a pin 104. The rocker arm 209 is fixedly connected to the drive shaft 211 by a bolt 210. The transmission component includes a drive gear 212 fixed on the drive shaft 211 and a driven gear 213 coaxially arranged with the telescopic fixed shaft 204 and meshing with the drive gear 212. The self-locking component is a limiter 4 disposed on the side of the drive gear.

[0035] The limiter 4 is a pawl 401 that cooperates with the drive gear 212. The pawl 401 is connected to the operating handle 403 via a spring 402. The pawl, spring and operating handle form a whole and are fixed to the plate 207 on which the winch is installed via a cover plate 404 and bolts 210.

[0036] In use, the hook on the wire rope is passed through the ear plate hole of the cable to be tensioned. The handle 208 is cranked, and power is transmitted via the rocker arm 209, the drive shaft 211, and the meshing drive gear 212 and driven gear 213, ultimately reaching the telescopic fixed shaft 204. This drives the two winches 202 to rotate synchronously, thus tensioning or releasing the wire rope 205. During this process, the pawl 401 of the limiter 4 is always engaged between the teeth of the drive gear 212 under the action of the spring 402, achieving one-way self-locking and ensuring that the tension force is safely maintained. To release, the operating handle 403 is pulled to disengage the pawl and release the self-locking.

[0037] like Figure 6 As shown: The two gearboxes 501 of the length telescopic mechanism 5 are fixed in the sliding grooves 105 of the winch support 201, and the two gearboxes are connected by a transmission rod 502; a rotating handle 503 is provided on one side of the gearbox 501, and a rotating shaft 504 is provided inside the gearbox. The rotating handle 503 is connected to the rotating shaft 504 of the gearbox 501, and a transmission gear 505 is provided on the rotating shaft; a telescopic rod 508 is connected below the gearbox, and a lead screw 507 is provided inside the telescopic rod. A driven gear 506 is fixed at the top of the lead screw, and the driven gear meshes with the transmission gear; the lower end of the telescopic rod extends into a fixed round rod 509, and a fixed nut 510 is provided inside the fixed round rod. The end of the lead screw extends out of the bottom of the telescopic rod and is screwed into the fixed nut.

[0038] The telescopic rod 508 and the fixed round rod 509 are both housed in the sliding groove 105 of the winch support 201, and the fixed round rod is fixed to one of the flat plates 207.

[0039] In use, rotating the handle 503 transmits power to the lead screw 507 via the shaft 504, transmission gear 505, and driven gear 506, driving the telescopic rod 508 to extend or retract relative to the fixed round rod 509, thereby causing the two flat plates 207 to move towards or away from each other, achieving precise and continuous adjustment of the span between the two winches 202, and realizing the synchronous tensioning of multiple cables at the same height.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tensioning device for a scaled-down model of a cable structure with adjustable height and span, characterized in that, include: A hydraulic lifting platform (1) has a scissor support arm (103) that connects a base (101) and a top frame (102). The base is provided with a sliding groove (105) and a hydraulic rod (107). A hand-cranked winch (2) is supported on the top frame of the hydraulic lifting platform and includes a telescopic sleeve (203). The two ends of the telescopic sleeve are respectively connected to two parallel winches (202). The parallel winches are respectively fixed on two flat plates (207). The telescopic sleeve (203) is wound with a steel wire rope (205) with a hook. One of the parallel winches is equipped with a self-locking manual rotation mechanism (3). The length telescopic mechanism (5) is installed between two flat plates (207) of the hand-cranked winch and is provided with two gearboxes (501) and a transmission mechanism. A transmission rod (502) is provided between the gearboxes.

2. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 1, characterized in that: The scissor arms (103) are connected to each other by pins (104). The base (101) has sliding grooves (105) on both sides inside. A pair of hydraulic rods (107) are provided in the middle of the sliding grooves (105). One end of the hydraulic rod (107) is connected to a lower round rod (108) that can slide in the sliding groove (105), and the other end is connected to a round rod fixed in the sliding groove (105). The two lower round rods (108) are connected to the lower end of the scissor arms. The top frame (102) has upper sliding grooves on both sides inside. One end of the upper sliding groove is provided with a limiting groove (106). A movable round rod (109) is provided in the limiting groove. The sliding round rod is connected to the upper end of the scissor arms.

3. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 1, characterized in that: The parallel winch (202) and the telescopic sleeve (203) form an integral structure, which is mounted on two flat plates (207) via a telescopic fixed shaft (204). The integral structure formed by the telescopic sleeve (203) and the parallel winch (202) is used to wind a steel wire rope (205) with a hook. The two parallel winches (202) are respectively provided with through holes (206) on their sides for the steel wire rope to pass through.

4. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 1, characterized in that: The self-locking manual transmission mechanism (3) includes an input component, a transmission component, and a self-locking component. The input component includes a handle (208) and a rocker arm (209) hinged by a pin (104). The rocker arm (209) is fixedly connected to the drive shaft (211) by a bolt (210). The transmission component includes a drive gear (212) fixed on the drive shaft (211) and a driven gear (213) coaxially arranged with the telescopic fixed shaft (204) and meshing with the drive gear (212). The self-locking component is a limiter (4) disposed on the side of the drive gear.

5. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 4, characterized in that: The limiter (4) is a pawl (401) that cooperates with the drive gear (212). The pawl (401) is connected to the operating handle (403) by a spring (402). The pawl, spring and operating handle form a whole and are fixed on the plate (207) on which the winch is installed by a cover plate (404) and bolts (210).

6. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 1, characterized in that: The two gearboxes (501) of the length telescopic mechanism (5) are fixed in the sliding groove (105) of the winch support (201), and the two gearboxes are connected by a transmission rod (502); a rotating handle (503) is provided on one side of the gearbox (501), and a rotating shaft (504) is provided inside the gearbox. The rotating handle (503) is connected to the rotating shaft (504) of the gearbox (501), and a transmission gear (505) is provided on the rotating shaft; a telescopic rod (508) is connected below the gearbox, and a lead screw (507) is provided inside the telescopic rod. A driven gear (506) is fixed at the top of the lead screw, and the driven gear meshes with the transmission gear; the lower end of the telescopic rod extends into a fixed round rod (509), and a fixed nut (510) is provided inside the fixed round rod. The end of the lead screw extends out of the bottom of the telescopic rod and is screwed into the fixed nut.

7. The tensioning device for a cable structure scaled-down model with adjustable height and span according to claim 6, characterized in that: The telescopic rod (508) and the fixed round rod (509) are both housed in the sliding groove (105) of the winch support (201), and the fixed round rod is fixed to one of the flat plates (207).

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