CN115411659A - Wire tightener and cable tightening method - Google Patents
Wire tightener and cable tightening method Download PDFInfo
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- CN115411659A CN115411659A CN202211039561.3A CN202211039561A CN115411659A CN 115411659 A CN115411659 A CN 115411659A CN 202211039561 A CN202211039561 A CN 202211039561A CN 115411659 A CN115411659 A CN 115411659A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention relates to the technical field of cable erection construction, in particular to a wire grip and a cable tensioning method. The pulley transmission unit comprises a fixed pulley, a movable pulley and a flexible cable. The fixed pulley is arranged in the basic frame. The movable pulley is arranged on one side of the basic frame. Two free ends of the flexible cable are respectively restrained by the fixed pulley and the base frame and are wound around the movable pulley. The electric driving part is used for driving the fixed pulley. The first traction hook assembly is borne by the base frame, while the second traction hook assembly is arranged independently of the base frame and is kept in synchronization with the displacement movement of the movable pulley. Therefore, on one hand, when the cable tightening operation is executed, the operators can be completely placed at the outer corner side of the cable, so that the construction safety risk is reduced; on the other hand, the labor-saving principle of the movable pulley block is applied, so that the requirement on the rated power value of the electric driving part is greatly reduced.
Description
Technical Field
The invention relates to the technical field of cable erection construction, in particular to a wire tightener and a cable tightening method.
Background
In performing a construction process of an overhead high voltage cable of an electric power system, it is required to pay close attention to a tension state of the high voltage cable. If the high-voltage cable is too loose, the usage amount of the high-voltage cable is increased, and when the sag value exceeds the standard seriously, the two adjacent high-voltage cables collide and rub against each other under the action of wind power. The tightener plays a role in tightening the high-voltage cable in overhead line laying construction so as to ensure that the erected high-voltage cable keeps a proper sag value.
Regarding the current state of the industry, the wire grip mostly adopts a manual mode to realize the wire grip operation, for example, chinese utility model patent CN210224794U discloses a wire grip for electric power engineering cable installation, including the wire grip casing, the wire grip casing is open-ended hollow structure. Install winding mechanism in the turn-buckle casing, winding mechanism includes the winding reel and fixes the two-way ratchet in the winding reel both sides, the winding reel rotates to be connected on turn-buckle casing both sides inner wall, the turn-buckle casing rotates and is connected with the rocker, the center of rotation of rocker is coaxial with the winding reel, it is used for promoting two-way ratchet pivoted two-way ratchet to rotate to install on the rocker, two-way ratchet is including being used for promoting two-way ratchet clockwise rotation's first promotion portion and being used for promoting two-way ratchet anticlockwise rotation's second promotion portion, the turn-buckle casing still is provided with and is used for restricting the reverse pivoted auto-lock subassembly of two-way ratchet when two-way ratchet rotates. Although this type of tightener can meet the basic requirements of high-voltage cable tightening operation, there are several problems in practical application: on the one hand, a labor saving mechanism is lacking. As the tightening process continues, the tension required to be applied to the cable increases. Thus, at the end of the cable tensioning operation, the operator needs to expend a lot of physical effort to drive the rocker, which increases his labor intensity; on the other hand, in the actual wire tightening operation, the operator needs to be positioned at the inner corner of the cable, which is inconvenient for the operator to open the cable, and the cable is easily broken due to the over-limit tension, and then the operator is easily pulled out due to the instantaneous release of the elastic potential energy, which has a great personal risk.
Disclosure of Invention
Therefore, in view of the above-mentioned problems and drawbacks, the present inventors have collected relevant information, evaluated and considered in many ways, and made continuous experiments and modifications by technicians engaged in the industry through years of research and development experience, which finally resulted in the emergence of the wire tightener.
In order to solve the technical problem, the invention relates to a wire tightener which comprises a base frame, a pulley transmission unit, an electric driving part, a first traction hook assembly and a second traction hook assembly. The pulley transmission unit comprises a fixed pulley, a movable pulley and a flexible cable. The fixed pulley is arranged in the foundation frame by virtue of the first bearing shaft and synchronously executes circumferential rotation motion along with the first bearing shaft. The movable pulley matched with the fixed pulley is arranged on one side of the basic frame. Two free ends of the flexible cable are respectively restrained by the fixed pulley and the base frame and are wound around the movable pulley. The electric driving part is used for driving the fixed pulley to perform circumferential rotation around the central axis of the fixed pulley and is borne by the base frame. The first traction hook assembly is borne by the base frame, while the second traction hook assembly is arranged independently of the base frame and is kept synchronized with the displacement movement of the movable pulley. In the starting state of the electric driving part, the fixed pulley continuously performs circumferential rotation to realize the circle-by-circle containing operation of the flexible cable, and meanwhile, the movable pulley performs displacement motion towards the base frame due to the tensile force of the flexible cable. And assuming that the length of the wire wound around the fixed pulley is L1 and the displacement distance of the movable pulley is L2, L2=1/2L1.
As a further improvement of the technical scheme of the invention, the first towing hook component comprises a first mounting seat and a first towing hook. The displacement motion of the first mounting seat and the base frame keeps synchronous. The first towing hook is connected with the first mounting seat and can freely execute deflection movement.
As a further improvement of the technical scheme of the invention, the second towing hook component comprises a second mounting seat and a second towing hook. The displacement motion of the second mounting seat and the movable pulley keeps synchronous. The second towing hook is connected with the second mounting seat and can freely execute deflection movement.
As a further improvement of the technical scheme of the invention, the electric driving part comprises a driving motor, a worm and gear mechanism and a force bearing frame. The worm gear mechanism is composed of a worm wheel and a worm. The bearing frame and the basic frame are welded into a whole. The worm wheel is fixed at one end of the first bearing shaft in a key connection mode. The worm matched with the worm wheel transversely penetrates the bearing frame. The driving motor is used for driving the worm to perform circumferential rotation motion around the central axis of the worm and is borne by the base frame. In the starting state of the driving motor, the rotation torque is transmitted along the path of the worm, the worm wheel, the first bearing shaft and the fixed pulley.
As a further improvement of the technical scheme of the invention, the wire grip also comprises a tensile stress testing part. The tensile stress testing part comprises a tension plate, a strain gauge and a display. The tension plate is connected between the base frame and the first traction hook component and can generate adaptive stretching deformation under the action of tension. The strain gauge is attached to the side wall of the tension plate, and the stretching deformation process of the strain gauge is synchronous with that of the tension plate. The display is fixed on the basic frame. The display is matched with the strain gauge for displaying the tension value of the tension plate in real time.
As a further improvement of the technical scheme of the invention, the wire grip also comprises a micro-motion driving unit. The micro-motion driving unit comprises an auxiliary pulley, a second bearing shaft and a direct drive motor. The auxiliary pulley used for restraining the free end of the flexible cable is arranged on the basic frame through a second bearing shaft and synchronously performs circumferential rotation motion along with the second bearing shaft. The direct drive motor is used for directly inputting a rotating torque towards the second bearing shaft and is fixedly arranged on one side of the base frame.
Compared with the wire tightener with the traditional design structure, in the technical scheme disclosed by the invention, the first traction hook component and the second traction hook component are pulled in opposite directions by the electric driving part, so that the cable is tightened. In the process of formally executing the wire tightening operation, an operator firstly hooks the first traction hook component on the wire rod positioning hook, the second traction hook component is hooked on the free end of the cable, then the operator is far away from the operation center area, and the electric driving part is started by virtue of the remote controller. In addition, in the whole process of executing the cable tightening operation, the wire tightener is reasonably applied to the labor-saving principle of the movable pulley block, and the wire tightener is a labor-saving lever with a power arm 2 times as large as a resistance arm. Therefore, on the premise of ensuring reliable and stable tightening of the cable, the requirement on the rated power value of the electric driving part can be effectively reduced, and good bedding is made for reducing the manufacturing cost of the wire tightener to a certain extent.
In addition, the invention also discloses a cable tensioning method which is implemented by the tightener and comprises the following steps;
s1, determining an ideal sag value alpha of a pre-erected cable according to cable erection acceptance criteria;
s2, measuring an initial sag value beta of the cable which is erected and is not tensioned;
s3, comparing the values of beta and alpha;
when beta is larger than or equal to 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, firstly, the electric driving part outputs a rotating torque to the fixed pulley, so that the cable is tightened in a high-speed mode; when the visual inspection sag value approaches to the ideal sag value alpha, the electric driving part stops immediately, and then the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to be within a reasonable range of the visual inspection sag value in a low-speed mode;
when alpha is more than beta and less than 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, the electric drive part is always kept in a stop state, and only the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to a reasonable range of visual sag values in a low-speed mode;
when the beta is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s4, rechecking the sag value beta 1 of the cable subjected to the tensioning operation;
s5, comparing the values of beta 1 and alpha;
when the beta 1 is larger than the alpha, the cable is tightened again by the tightener, and the low-speed tightening operation is performed by only the direct drive motor in the whole tightening process until the cable is adjusted to be within a reasonable range of visual sag values; in the whole wire tightening process, the pulling speed of the free end of the cable is not more than 1.5m/min;
when the beta 1 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s6, rechecking the sag value beta 2 of the cable subjected to the tensioning operation;
s7, comparing the values of beta 2 and alpha;
when the beta 2 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
and when β 2 > α, step S5 is repeated.
As a further improvement of the above technical solution, in step S3, assuming that the tensile ultimate bearing capacity of the cable is σ, the display displays the number Φ in real time. In the process of tightening the cable, the operator needs to observe phi in real time. Under the mode that the cable is tightened at a high speed, when phi reaches K1 sigma, the electric drive part is stopped immediately, and K1 is more than 0 and less than 1; under the mode that the cable is tightened by the low speed, when phi reaches K2 sigma, the direct drive motor is stopped immediately, and K1 is more than 0 and less than K2 and less than 1.
As a further improvement of the above technical solution, in step S5, when β 1 > α, only the direct drive motor outputs a rotation torque to the auxiliary pulley, and the cable is tightened at a low speed. In the low-speed tightening process, an operator needs to observe phi in real time, when phi reaches K3 sigma, the direct drive motor is stopped immediately, K1 is more than 0 and less than K3 and less than 1, K3 is less than or equal to 1.2K2, and the operator needs to retest the sag value for multiple times until the sag value meets the cable erection acceptance standard.
As a further improvement of the technical scheme, the crawling trolley, the angular speed acquisition module and the ground data receiving device cooperate with each other to measure the cable sag value. The crawling trolley has autonomous power and performs crawling movement along the erected cable in the working process of actually performing measurement of the cable sag value. The angular speed acquisition module is matched with the crawling trolley for use to acquire the real-time angular speed of the crawling trolley. The ground data receiving device receives and collects real-time linear speed parameters of the crawling trolley and angular speed parameters collected by the angular speed collecting module, a curve equation of the cable is fitted after data processing and analysis, and then the sag value of the cable is obtained through solution.
Through adopting above-mentioned technical scheme to set up, after the cable was erect and is accomplished, the mode selection of tensioning of deciding the cable according to the comparison result of ideal sag value and initial sag value, and when actual measurement sag value and ideal sag value compare the difference great, take the mode that high-speed mode and low-speed mode mix in order to realize the tensioning operation to the cable. In addition, in the actual tensioning process, the tension force applied to the cable can be monitored and controlled in real time, so that the reasonable sag value of the cable subjected to tensioning operation is effectively ensured, and the accidental breakage phenomenon of the cable caused by over-limit tension is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a perspective view of a first embodiment of the tightener of the present invention from one perspective.
Fig. 2 is a perspective view of the first embodiment of the tightener of the present invention from another perspective.
Fig. 3 is a perspective view of a second embodiment of the tightener of the present invention.
Fig. 4 is a perspective view of a third embodiment of the tightener in accordance with the present invention.
1-a base frame; 2-a pulley transmission unit; 21-a fixed pulley; 22-a movable pulley; 23-a flexible cable; 3-an electric drive part; 31-a drive motor; 32-a worm gear mechanism; 321-a worm wheel; 322-a worm; 33-a bearing frame; 4-a first tow hook assembly; 41-a first mount; 42-a first towing hook; 5-a second tow hook component; 51-a second mount; 52-a second tow hook; 6-a micro-motion driving unit; 61-an auxiliary pulley; 62-direct drive motor; 7-tensile stress test section; 71-a tension plate; 72-strain gauge; 73-display.
Detailed Description
In the description of the present invention, it should be understood that the terms "front", "back", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to the following specific examples, and fig. 1 and fig. 2 respectively show two schematic perspective views of a first embodiment of the tightener of the present invention from different perspectives, and it can be seen that the tightener mainly comprises a base frame 1, a pulley transmission unit 2, an electric driving part 3, a first draw hook assembly 4, a second draw hook assembly 5, and so on. Wherein, the foundation frame 1 is of a frame structure and is formed by assembling and welding a plurality of steel plates. The pulley transmission unit 2 includes a fixed pulley 21, a movable pulley 22, and a flexible cable 23. The fixed pulley 21 is installed in the cavity of the base frame 1 by a first bearing shaft (not shown), and performs a circumferential rotation motion synchronously with the first bearing shaft. The movable pulley 22 is applied in cooperation with the fixed pulley 21 and is independently disposed at the left side of the base frame 1. The two free ends of the flexible cable 23 are restrained by the fixed pulley 21 and the base frame 1, respectively, and are wound around the movable pulley 22. The electric drive section 3 is used to drive the fixed pulley 21 to perform a circumferential rotational motion about its central axis, which is borne by the base frame 1. The first traction hook assembly 4 is borne by the base frame 1, while the second traction hook assembly 5 is arranged independently of the base frame 1 and in synchronism with the displacement movement of the movable pulley 22. The electric driving part 3 is used for realizing the opposite pulling of the first traction hook component 4 and the second traction hook component 5. In the activated state of the electric drive unit 3, the fixed pulley 21 continuously performs a circumferential rotation movement to perform a winding-by-winding storage operation of the flexible cable 23, and at the same time, the movable pulley 22 performs a displacement movement with respect to the base frame 1 by receiving a tensile force of the flexible cable 23. Assuming that the length of the wire 23 wound around the fixed sheave 21 is L1 and the displacement distance of the movable sheave 22 is L2 per unit time, L2=1/2L1.
According to common design knowledge, the first towing hook component 4 can take a plurality of designs to achieve the towing of the cable, however, an embodiment is proposed herein that is simple in design, easy to implement and later facilitates the performance of the rework operation, as follows: as shown in fig. 1 and 2, the first tow hook assembly 4 preferably includes a first mounting seat 41 and a first tow hook 42. The first mounting seat 41 is fixed to the right side wall of the base frame 1 by welding. The first draw hook 42 is connected to the first mount 41 and can freely perform a yawing motion.
For the same design purposes, the second towing hook component 5 can also be designed with reference to the design of the first towing hook component 4. As shown in fig. 1 and 2, the second towing hook assembly 5 preferably includes a second mounting seat 51 and a second towing hook 52. The second mounting seat 51 is pulled directly by the movable pulley 22 and is kept in synchronization with the displacement movement of the movable pulley 22. The second draw hook 52 is connected with the second mount 51 and can freely perform a yawing motion.
As can also be seen from fig. 1 and 2, the electric driving part 3 preferably comprises a driving motor 31, a worm gear mechanism 32 and a force bearing frame 33. The worm gear mechanism 32 is composed of a worm wheel 321 and a worm 322. The bearing frame 33 and the base frame 1 are welded into a whole. The worm gear 321 is fixed to one end of the first bearing shaft in a key coupling manner. A worm 322 matched with the worm gear 321 traverses the force bearing frame 33. The drive motor 31 is used to drive the worm 322 to perform a circumferential rotational motion about its central axis, and is borne by the base frame 1. The first bearing shaft not only plays a role of bearing the fixed pulley 21, but also plays a role of transmitting the rotation moment. In the activated state of the driving motor 31, the rotational torque is transmitted along the path of the worm 322, the worm wheel 32, the first bearing shaft and the fixed pulley 21. According to the common sense of design, worm gear 32 has great drive ratio in the actual motion, compact structure, and because of the line contact when meshing, has screw mechanism's characteristics, so has the characteristics that bearing capacity is strong, the transmission is steady, the low noise. More importantly, the worm and gear mechanism 32 has a self-locking characteristic, and can effectively avoid the phenomenon of 'rollback' caused by instantaneous insufficient pulling force in the process of executing cable tightening on the premise of ensuring that the wire tightener has a simple design structure, so that good bedding can be made for ensuring the wire tightening efficiency of the cable.
In the process of formally executing the wire tightening operation, an operator firstly hangs the first traction hook 42 on the wire rod positioning hook, the second traction hook 52 is hung on the free end of the cable, then, the operator is far away from the operation center area, starts the driving motor 31 by virtue of a remote controller, transmits the rotation torque to the fixed pulley 21 through the worm gear mechanism 32, and in the process that the flexible cable 23 is tightened around the fixed pulley 21 in a circle by circle, the second traction hook 52 performs opposite displacement movement relative to the first traction hook 42, and finally high-speed tightening of the cable is realized. Therefore, the remote control operation is possible, and an operator can be completely positioned at the outer corner side of the cable during actual operation, so that the phenomenon that the cable is accidentally whipped due to the instant fracture caused by the fact that the cable is pulled to be over-limited is effectively avoided.
In addition, it should be noted that, in the whole process of executing the cable tightening operation, the wire tightener is reasonably applied to the labor-saving principle of the movable pulley block, and the wire tightener is a labor-saving lever with a power arm 2 times as large as a resistance arm. Therefore, on the premise of ensuring reliable and stable tightening of the cable, the requirement on the rated power value of the driving motor 31 can be effectively reduced, and good bedding is made for reducing the manufacturing cost of the wire tightener to a certain extent.
Fig. 3 shows a schematic perspective view of a second embodiment of the tightener of the present invention, which differs from the first embodiment described above in that: the tightener is also additionally provided with a micro-motion driving unit 6. The micro-motion drive unit 6 comprises an auxiliary pulley 61, a second bearing shaft (not shown in the figure) and a direct drive motor 62. The auxiliary pulley 61 for restraining the free end of the wire 23 is mounted on the base frame 1 via a second messenger shaft and performs a circumferential rotational motion in synchronization with the second messenger shaft. The direct drive motor 62 is used for directly inputting a rotation torque to the second bearing shaft, and is detachably fixed to one side of the base frame 1. The second force bearing shaft not only plays a role of bearing the auxiliary pulley 61, but also plays a role of transmitting the rotation moment. Therefore, at the end of the cable tightening operation process, the driving motor 31 stops running, the direct drive motor 62 is started immediately, and the cable is dragged in a low-speed mode, so that the cable can be effectively prevented from being pulled or broken due to the fact that the instantaneous tension force exceeds the limit, the tightened cable can be ensured to have a more accurate sag value, and the cable erection acceptance standard can be favorably met.
Fig. 4 shows a schematic perspective view of a third embodiment of the tightener of the present invention, which differs from the first embodiment described above in that: the tightener is also additionally provided with a tensile stress testing part 7. The tensile stress test section 7 is mainly composed of several parts, such as a tension plate 71, a strain gauge 72, and a display 73. The tension plate 71 is connected between the base frame 1 and the first mounting base 41, and can be adaptively stretched and deformed when being subjected to tension. The tension plate 71 is preferably made of a metal material or a polymer composite material with a tensile strength controlled to 100 to 130 Mpa. The strain gauge 72 is attached to the sidewall of the tension plate 71, and the progress of tensile deformation thereof is synchronized with the tension plate 71. The display 73 is fixed to the base frame 1. The display 73 is used in conjunction with the strain gauge 72 to display the tension value applied to the tension plate 71 in real time. The strain gauge 72 is preferably an element for measuring strain, which is constituted by a sensitive grid or the like. In the process of performing the tightening operation on the cable, the strain gauge 72 is subjected to tensile deformation synchronously with the tension plate 71, and as the measuring point is subjected to strain, the sensitive grid is also subjected to deformation, so that the resistance value of the sensitive grid is changed. Then, the resistance variation amplitude is measured by a special instrument and converted into a strain value of a measuring point, the real-time tightening force generated by the wire grip is finally converted and directly reflected on the display 73, so that a worker can visually grasp the tension value of the cable in real time, and when the displayed tension value approaches to the allowable tension value of the cable, the driving motor 31 is immediately stopped, thereby effectively avoiding the phenomenon that the cable is pulled and damaged or broken due to instantaneous tension overrun.
In addition, the invention also discloses a cable tensioning method which is implemented by the tightener and comprises the following steps;
s1, determining an ideal sag value alpha of a pre-erected cable according to cable erection acceptance criteria; in the process of determining the ideal sag value alpha, parameters such as the distance between the wire rods, the type and the specification of the cable need to be comprehensively considered, and the parameters are corrected according to the temperature, the humidity, the wind speed, the ice and other weather parameters of the erected area.
S2, measuring an initial sag value beta of the erected cable which is not tensioned by means of the crawling trolley; the crawling trolley, the angular speed acquisition module and the ground data receiving device are cooperated with each other to measure the sag value of the cable. The crawling trolley has autonomous power and performs crawling movement along the erected cable in the working process of actually performing measurement of the cable sag value. The angular speed acquisition module is matched with the crawling trolley for use to acquire the real-time angular speed of the crawling trolley. The ground data receiving device receives and collects real-time linear velocity parameters of the crawling trolley and angular velocity parameters collected by the angular velocity collection module, and after data processing and analysis, a curve equation of the cable is fitted, and then the sag value of the cable is obtained through solution;
s3, comparing the values of beta and alpha;
when beta is larger than or equal to 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, firstly, the electric driving part outputs a rotating torque to the fixed pulley, so that the cable is tightened in a high-speed mode; when the visual inspection sag value is close to the ideal sag value alpha, the electric driving part stops immediately, and then the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to be within a reasonable range of the visual inspection sag value in a low-speed mode;
when alpha is more than beta and less than 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, the electric drive part is always kept in a stop state, and only the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to a reasonable range of visual sag values in a low-speed mode;
when the beta is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s4, rechecking the sag value beta 1 of the cable subjected to the tensioning operation;
s5, comparing the values of beta 1 and alpha;
when the beta 1 is larger than the alpha, performing secondary wire tightening operation on the cable by means of the wire tightener, and performing low-speed tightening operation only by means of the direct drive motor in the whole wire tightening process until the cable is adjusted to be within a reasonable range of visual sag values; in the whole wire tightening process, the pulling speed of the free end of the cable is not more than 1.5m/min;
when the beta 1 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s6, rechecking the sag value beta 2 of the cable subjected to the tensioning operation;
s7, comparing the values of beta 2 and alpha;
when the beta 2 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
and when β 2 > α, step S5 is repeated.
Through adopting above-mentioned technical scheme to set up, after the cable was erect and is accomplished, the mode selection of tensioning of deciding the cable according to the comparison result of ideal sag value and initial sag value, and when actual measurement sag value and ideal sag value compare the difference great, take the mode that high-speed mode and low-speed mode mix in order to realize the tensioning operation to the cable. So, compromise under the prerequisite that the cable tightened up efficiency, guaranteed that the cable has more accurate sag value after being tightened up.
In the process of executing the cable tightening process, whether the real-time tension borne by the cable tightening device exceeds the limit or not needs to be considered. In view of this, as a further optimization of the above technical solution, in step S3, assuming that the tensile ultimate bearing capacity of the cable is σ, the display displays the number in real time as Φ. In the process of tightening the cable, the operator needs to observe phi in real time. Under the mode that the cable is tightened at a high speed, when phi reaches K1 sigma, the electric drive part is stopped immediately, and K1 is more than 0 and less than 1; and under the low-speed tightening mode of the cable, immediately stopping the direct drive motor when phi reaches K2 sigma, wherein K1 is more than 0 and K2 is less than 1. In step S5, when β 1 > α, a rotational torque is output only by the direct drive motor toward the auxiliary pulley, and the cable is tightened at a low speed. In the low-speed tightening process, an operator needs to observe phi in real time, when the phi reaches K3 sigma, the direct drive motor is immediately stopped, K1 is more than 0 and less than K3 and less than 1, K3 is less than or equal to 1.2K2, and the operator needs to retest the sag value for multiple times until the sag value meets the cable erection acceptance standard. According to long-term construction experience, generally, the value of K1 is 0.7, the value of K2 is 0.85, and the value of K3 is 0.9. In the process of actually executing the cable tensioning operation, the worker can monitor and control the tension value applied to the cable in real time, so that the cable subjected to the tensioning operation is effectively ensured to have an accurate and reasonable sag value, and the phenomenon of tension loss and even breakage of the cable due to over-limit tension is avoided.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A wire grip is characterized by comprising a basic frame, a pulley transmission unit, an electric drive part, a first traction hook component and a second traction hook component; the pulley transmission unit comprises a fixed pulley, a movable pulley and a flexible cable; the fixed pulley is arranged in the base frame by virtue of a first bearing shaft and synchronously executes circumferential rotation motion along with the first bearing shaft; the movable pulley applied in cooperation with the fixed pulley is arranged on one side of the base frame; two free ends of the flexible cable are respectively restrained by the fixed pulley and the base frame and wound through the movable pulley; the electric driving part is used for driving the fixed pulley to perform circumferential rotation motion around the central axis of the fixed pulley and is borne by the base frame; the first traction hook component is borne by the base frame, and the second traction hook component is arranged independently of the base frame and keeps synchronous with the displacement motion of the movable pulley; in the starting state of the electric driving part, the fixed pulley continuously performs circumferential rotation to realize the circle-by-circle storage operation of the flexible cable, and meanwhile, the movable pulley performs displacement motion relative to the base frame under the action of the tension of the flexible cable; and assuming that the length of the wire wound around the fixed pulley is L1 and the displacement distance of the movable pulley is L2, L2=1/2L1.
2. The tightener of claim 1, wherein the first draw hook assembly comprises a first mounting seat and a first draw hook; the displacement motion of the first mounting seat and the basic frame is kept synchronous; the first towing hook is connected with the first mounting seat and can freely execute deflection movement.
3. The tightener of claim 1, wherein the second draw hook assembly comprises a second mounting seat and a second draw hook; the displacement motion of the second mounting seat and the movable pulley is kept synchronous; the second towing hook is connected with the second mounting seat and can freely execute deflection movement.
4. The tightener according to any one of claims 1-3, wherein the electric driving part comprises a driving motor, a worm gear mechanism and a force bearing frame; the worm gear mechanism consists of a worm gear and a worm; the bearing frame and the base frame are welded into a whole; the worm wheel is fixed at one end of the first bearing shaft in a key connection mode; the worm matched with the worm wheel transversely penetrates through the force bearing frame; the driving motor is used for driving the worm to perform circumferential rotation motion around the central axis of the worm and is borne by the base frame; and in the starting state of the driving motor, the rotating torque is transmitted along the path of the worm, the worm wheel, the first bearing shaft and the fixed pulley.
5. The turnbuckle of any one of claims 1-3, further comprising a tensile stress testing section; the tensile stress testing part comprises a tension plate, a strain gauge and a display; the tension plate is connected between the base frame and the first traction hook assembly and can generate adaptive stretching deformation under the action of tension; the strain gauge is attached to the side wall of the tension plate, and the stretching deformation process of the strain gauge is synchronous with that of the tension plate; the display is fixed on the base frame; the display is matched with the strain gauge for displaying the tension value of the tension plate in real time.
6. The tightener according to claim 5, further comprising a micro-motion drive unit; the micro-motion driving unit comprises an auxiliary pulley, a second bearing shaft and a direct drive motor; the auxiliary pulley used for restraining the free end of the flexible cable is arranged on the base frame through the second bearing shaft and synchronously performs circumferential rotation motion along with the second bearing shaft; the direct drive motor is used for directly inputting a rotating torque towards the second bearing shaft and is fixedly arranged on one side of the base frame.
7. A cable tensioning method, carried out by means of the tightener of claim 6, comprising the following steps;
s1, determining an ideal sag value alpha of a pre-erected cable according to a cable erection acceptance standard;
s2, measuring an initial sag value beta of the cable which is erected and is not tensioned;
s3, comparing the values of beta and alpha;
when the beta is larger than or equal to 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, firstly, the electric driving part outputs a rotating torque to the fixed pulley, so that the cable is tightened in a high-speed mode; when the visual inspection sag value approaches to the ideal sag value alpha, the electric driving part is stopped immediately, and then the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to be within a reasonable range of the visual inspection sag value in a low-speed mode;
when alpha is more than beta and less than 1.5 alpha, the cable is tightened by the tightener, and in the process of tightening operation, the electric drive part is always kept in a stop state, and only the direct drive motor outputs a rotating torque to the auxiliary pulley, so that the cable is tightened to a reasonable visual observation sag value range in a low-speed mode;
when the beta is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s4, rechecking the sag value beta 1 of the cable subjected to the tensioning operation;
s5, comparing the values of beta 1 and alpha;
when the beta 1 is larger than the alpha, performing secondary wire tightening operation on the cable by means of the wire tightener, and performing low-speed tightening operation by means of the direct drive motor in the whole wire tightening process until the cable is adjusted to be within a reasonable range of visual sag values; in the whole wire tightening process, the pulling speed of the free end of the cable is not more than 1.5m/min;
when the beta 1 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
s6, rechecking the sag value beta 2 of the tensioned cable;
s7, comparing the values of beta 2 and alpha;
when the beta 2 is less than or equal to the alpha, the sag value of the cable is judged to meet the cable erection acceptance standard;
and when β 2 > α, step S5 is repeated.
8. The cable tensioning method according to claim 7, characterized in that in step S3, assuming the tensile ultimate bearing capacity of the cable is σ, the display displays the number Φ in real time; in the process of tightening the cable, an operator needs to observe phi in real time; under the mode that the cable is tightened at a high speed, when phi reaches K1 sigma, the electric drive part is stopped immediately, and K1 is more than 0 and less than 1; and under the low-speed tightening mode of the cable, when phi reaches K2 sigma, immediately stopping the direct drive motor, wherein K1 is more than 0 and K2 is less than 1.
9. The cable tensioning method according to claim 8, wherein in step S5, when β 1 > α, a rotational torque is outputted only by the direct drive motor toward the auxiliary pulley, and the cable is tightened at a low speed; in the low-speed tightening process, an operator needs to observe phi in real time, when the phi reaches K3 sigma, the direct drive motor is stopped immediately, K1 is more than 0 and less than K3 and less than 1, K3 is less than or equal to 1.2K2, and the operator needs to retest the sag value for multiple times until the sag value meets the cable erection acceptance standard.
10. The cable tensioning method according to claim 7, wherein the crawling trolley, the angular velocity acquisition module and the ground data receiving device cooperate with each other to realize the measurement of the cable sag value; the crawling trolley has autonomous power and executes crawling movement along the erected cable in the actual measurement working process of the sag value of the cable; the angular speed acquisition module is matched with the crawling trolley for application so as to acquire the real-time angular speed of the crawling trolley; the ground data receiving device receives and collects the real-time linear velocity parameters of the crawling trolley and the angular velocity parameters collected by the angular velocity collecting module, a curve equation of the cable is fitted after data processing and analysis, and then the sag value of the cable is obtained through solution.
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| CN202211039561.3A CN115411659B (en) | 2022-08-29 | 2022-08-29 | Cable tensioning method |
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| CN115411659B (en) | 2023-09-08 |
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