A flexible rope pre-stretching method

Abstract

The present invention relates to the technical field of aviation sonar, in particular to a method for pre-stretching a flexible rope. This method involves a pre-tightening device, a positioning device, a support rod, and a flexible rope; the pre-tightening device includes a thrust mechanism, a pre-tightening frame, pulley A, and a counterweight; the thrust mechanism includes a handwheel, a lead screw, a nut, pulley B, a guide shaft, and a thrust frame; the positioning device includes a positioning frame and pulley C. Using this method to stretch the flexible rope can be carried out in open spaces or general workshops, with a small occupied space and reduced requirements for the operating site; multiple flexible ropes can be pre-stretched synchronously, and the length in the stretched state can be easily measured; the distance between the pre-tightening device and the positioning device can be adjusted by increasing the number of sections of the support rod, increasing the length of a single flexible rope; when the suspended counterweight touches the ground as the flexible rope elongates, the counterweight can be lifted by rotating the handwheel of the thrust mechanism without re-suspending the counterweight.

Description

Technical Field

[0001] The invention relates to the technical field of aviation sonar, and in particular to a flexible rope pre-stretching method. Background Art

[0002] With the development of aviation sonar technology, underwater acoustic systems of dipping sonar and sonar buoys are gradually developing towards large apertures, typically vertical line acoustic arrays and planar acoustic arrays. These acoustic arrays need to be folded together before use to reduce the space occupied by the platform, and can be smoothly deployed when used to form an accurate and stable formation. The various primitives of the acoustic array are connected in series through flexible ropes, and the length or diameter of the acoustic array is required to meet the design value, and the spacing between the primitives remains constant.

[0003] The flexible rope used in aviation sonar equipment is generally woven with brocade silk thread or cotton silk thread, has unlimited degrees of freedom, and has a certain degree of expansion and contraction deformation under the action of external force. In order to avoid large expansion and contraction of the flexible rope during use, resulting in large errors in the total length or element spacing of the sound array, it is necessary to pre-stretch the flexible rope before cutting it. Pre-stretch the flexible rope with a weight that is not less than the weight that the flexible rope has to bear, and measure the length required for cutting under the condition of flexible rope stretching. At present, most flexible rope pre-stretching methods are to tie one end of the flexible rope to a higher hanging point and hang a heavy object on the other end of the flexible rope. This operation method requires finding a hanging point higher than the ground, which imposes restrictions on the operation site. If the flexible rope has a large elongation, the heavy object will touch the ground, and multiple people will need to cooperate to re-hang it, which is time-consuming and laborious. In addition, it is troublesome to mark the cutting position of the flexible rope and measure the length when hanging at high altitude. Summary of the invention

[0004] In view of the shortcomings of the prior art, an object of the present invention is to provide a flexible rope pre-stretching method.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flexible rope pre-stretching method, the method involves a pre-tensioning device, a positioning device, a support rod and a flexible rope, the pre-tensioning device and the positioning device are two independent units, placed on the ground at a certain distance, and connected and fixed by a support rod, there are four support rods in total, which are symmetrically installed between the pre-tensioning device and the positioning device to position the distance between the pre-tensioning device and the positioning device, and multiple smooth pulleys are installed on the pre-tensioning device and the positioning device, and the pulleys are used to limit and support the flexible rope, so as to facilitate the turning and stretching of the flexible rope and the transmission of tension; the flexible rope is wound back and forth between the pulleys to increase the length of a single flexible rope.

[0006] Preferably, the pre-tightening device includes a thrust mechanism, a pre-tightening frame, pulley A, and a counterweight. The thrust mechanism is installed on the pre-tightening frame. A plurality of pulley A are provided, and all the pulley A are installed on the pre-tightening frame. The counterweight is connected to the end of the flexible rope.

[0007] Preferably, the thrust mechanism includes a handwheel, a lead screw, a nut, pulley B, a guide shaft, and a thrust frame. The thrust frame is fixed on the pre-tightening frame; the nut and the guide shaft are fixed on the thrust frame; the handwheel is fixedly connected to the lead screw, the lead screw is in threaded cooperation with the nut, pulley B is installed at the lower end of the lead screw, and pulley B is arranged in cooperation with the guide shaft. Rotate the handwheel to make the lead screw rotate relative to the nut and move up and down at the same time. The lead screw drives pulley B to move up and down along the guide shaft; when pulley B moves downward, it pushes the flexible rope to stretch downward, lifts the counterweight, and forces the flexible rope to bear the tensile force.

[0008] Preferably, the positioning device includes a positioning frame and pulley C. A plurality of pulley C are provided, and the plurality of pulley C are installed on the positioning frame.

[0009] Preferably, the starting end of the flexible rope is tied to pulley A of the pre-tightening device close to the ground, the middle section bypasses pulley C on the positioning device, and the end bypasses pulley A of the pre-tightening device far from the ground and is in a free state. A counterweight is suspended at the end; the weight of the counterweight is determined according to the working conditions of the flexible rope.

[0010] Preferably, the pre-tightening frame is welded by angle aluminum or other metal materials.

[0011] Preferably, each support rod is formed by butting multiple metal rods, and the length of the support rod is determined according to the distance between the pre-tightening device and the positioning device.

[0012] Preferably, the positioning frame is welded by angle aluminum or other metal materials.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a method for pre-stretching a flexible rope, which can carry out work in open spaces or general factories, occupies a small space, and reduces the requirements for the operating site; it can pre-stretch multiple flexible ropes synchronously and easily measure the length in the stretched state; it can adjust the distance between the pre-tightening device and the positioning device by increasing the number of sections of the support rod and increase the length of a single flexible rope; when the suspended counterweight touches the ground as the flexible rope elongates, the counterweight can be lifted by rotating the handwheel without re-suspending the counterweight; a single person can complete the placement of the flexible rope and the suspension of the counterweight, and the operation is relatively convenient, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the installation schematic diagram of the flexible rope pre-stretching of the present invention;

[0015] Figure 2 Schematic diagram of the pre-tightening device of the present invention;

[0016] Figure 3 Schematic diagram of the thrust mechanism of the present invention;

[0017] Figure 4 Schematic diagram of the positioning device of the present invention.

[0018] In the figure: 1. Pre-tightening device; 2. Positioning device; 3. Support rod; 4. Flexible rope; 11. Thrust mechanism; 12. Pre-tightening frame; 13. Pulley A; 14. Counterweight; 21. Positioning frame; 22. Pulley C; 111. Handwheel; 112. Lead screw; 113. Nut; 114. Pulley B; 115. Guide shaft; 116. Thrust frame. Specific implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Flexible rope pre-stretching method, which involves a pre-tightening device, a positioning device, a support rod and a flexible rope. The pre-tightening device and the positioning device are placed on the ground at an interval as two independent units and are fixedly connected by the support rod.

[0021] There are a total of four support rods, and each support rod is formed by butt-jointing multiple sections of metal rods. The length of the support rod is determined according to the distance between the pre-tightening device and the positioning device, and is symmetrically installed between the pre-tightening device and the positioning device to position the distance between the pre-tightening device and the positioning device. A plurality of smooth pulleys are installed on the pre-tightening device and the positioning device, and the pulleys are used to limit and support the flexible rope, facilitating the turning, stretching and transmission of the pulling force of the flexible rope.

[0022] The pre-tightening device includes a thrust mechanism, a pre-tightening frame, pulley A and a counterweight. The thrust mechanism is installed on the pre-tightening frame. A plurality of pulley A are provided and are all installed on the pre-tightening frame. The counterweight is connected to the end of the flexible rope. The pre-tightening frame is welded by angle aluminum or other metal materials.

[0023] The thrust mechanism includes a handwheel, a lead screw, a nut, a pulley B, a guide shaft, and a thrust frame. The thrust frame is fixed on the pre-tightening frame. The nut and the guide shaft are fixed on the thrust frame. The handwheel is fixedly connected to the lead screw, the lead screw is in threaded fit with the nut, the pulley B is installed at the lower end of the lead screw, and the pulley B is arranged in cooperation with the guide shaft. When the handwheel is rotated, the lead screw rotates relative to the nut and moves up and down at the same time. The lead screw drives the pulley B to move up and down along the guide shaft. When the pulley B moves downward, it pushes the flexible rope to stretch downward, lifts the counterweight, and forces the flexible rope to bear the tensile force.

[0024] The positioning device includes a positioning frame and a pulley C. There are multiple pulley Cs, and the multiple pulley Cs are installed on the positioning frame. The positioning frame is welded by angle aluminum or other metal materials.

[0025] The flexible rope winds back and forth between the pulleys to increase the length of a single flexible rope. The starting end of the flexible rope is tied to the pulley A near the ground of the pre-tightening device, the middle section bypasses the pulley C on the positioning device, and the end bypasses the pulley A far from the ground of the pre-tightening device and is in a free state. A counterweight is suspended at the end. The weight of the counterweight is determined according to the working conditions of the flexible rope.

[0026] Specific embodiments based on the above solutions

[0027] Please refer to Figures 1-4 , the present invention provides a technical solution: a method for pre-stretching a flexible rope, which relates to a pre-tightening device 1, a positioning device 2, a support rod 3, and a flexible rope 4. The pre-tightening device 1 includes a thrust mechanism 11, a pre-tightening frame 12, a pulley A 13, and a counterweight 14. The thrust mechanism 11 includes a handwheel 111, a lead screw 112, a nut 113, a pulley B 114, a guide shaft 115, and a thrust frame 116. The positioning device 2 includes a positioning frame 21 and a pulley C 22.

[0028] The pre-tightening device 1 and the positioning device 2 are placed on the ground at an interval as two independent units and are fixedly connected by the support rod 3. There are four support rods 3 in total, which are symmetrically installed between the pre-tightening device 1 and the positioning device 2. Each support rod 3 is formed by butt-jointing multiple sections of aluminum alloy rods to position the distance between the pre-tightening device 1 and the positioning device 2, and the length of the support rod 3 can be increased. A plurality of smooth pulleys (8 pulley As, 2 pulley Bs, and 4 pulley Cs respectively) are installed on the pre-tightening device 1 and the positioning device 2. The pulleys are used to limit and support the flexible rope 4, facilitating the turning and stretching of the flexible rope 4 and transmitting the tensile force. The flexible rope 4 can wind back and forth between the pulleys to increase the length of a single flexible rope 4. The starting end of the flexible rope 4 is tied to the pulley A 13 near the ground of the pre-tightening device 1, the middle section bypasses the pulley C 22 on the positioning device 2, and the end bypasses the pulley A 13 far from the ground of the pre-tightening device 1 and is in a free state. A counterweight 14 is suspended at the end. The weight of the counterweight 14 is determined according to the working conditions of the flexible rope 4.

[0029] The pre-tightening frame 12 of the pre-tightening device 1 is welded by angle aluminum or other metal materials, and the frame is stable and reliable. A thrust mechanism 11 and a plurality of A pulleys 13 are installed on the pre-tightening frame 12.

[0030] The thrust mechanism 11 is a tension adjustment mechanism for the flexible rope 4; the thrust frame 116 is fixed on the pre-tightening frame 12; the nut 113 and the guide shaft 115 are fixed on the thrust frame 116; the handwheel 111 is fixedly connected to the lead screw 112. When the handwheel 111 is rotated, the lead screw 112 rotates relative to the nut 113 and moves up and down at the same time. The lead screw 112 drives the B pulley 114 to move up and down along the guide shaft 115; when the B pulley 114 moves downward, it pushes the flexible rope 4 to be stretched downward, lifts the counterweight 14, and forces the flexible rope 4 to bear the tensile force.

[0031] The positioning frame 21 of the positioning device 2 serves as a support frame and is welded by angle aluminum or other metal materials. The frame is stable and reliable. A plurality of C pulleys 22 are installed on the positioning frame 21, and the C pulleys 22 are used for the flexible rope 4 to turn and transmit the tensile force.

[0032] Through this technical solution, the present invention can pre-stretch two flexible ropes at the same time; more flexible ropes can be pre-stretched simultaneously by adding multiple sets of components such as lead screws, nuts, pulleys and counterweights; the distance between the pre-tightening device and the positioning device can be adjusted by increasing the number of sections of the support rod, and the length of a single flexible rope can be increased; the counterweight can be easily lifted by rotating the handwheel of the thrust mechanism without directly lifting the counterweight by hand; a single person can complete the placement of the flexible rope and the hanging of the counterweight, and the operation is relatively convenient, safe and reliable.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flexible rope pre-stretching method, which involves a pre-tightening device, a positioning device, a support rod and a flexible rope, is characterized in that: The pre-tightening device and the positioning device are placed on the ground as two independent units with a certain distance between them. They are fixedly connected by support rods. There are four support rods in total, which are symmetrically installed between the pre-tightening device and the positioning device to position the distance between the pre-tightening device and the positioning device. A plurality of smooth pulleys are installed on the pre-tightening device and the positioning device. The pulleys are used to limit and support the flexible rope, facilitating the turning, stretching and transmission of the tensile force of the flexible rope; the flexible rope winds back and forth between the pulleys to increase the length of a single flexible rope; the pre-tightening device includes a thrust mechanism, a pre-tightening frame, pulley A and a counterweight; the thrust mechanism is installed on the pre-tightening frame; a plurality of pulley A are provided, and all the pulley A are installed on the pre-tightening frame; the counterweight is connected to the end of the flexible rope; the thrust mechanism includes a handwheel, a lead screw, a nut, pulley B, a guide shaft and a thrust frame; the thrust frame is fixed on the pre-tightening frame; the nut and the guide shaft are fixed on the thrust frame; the handwheel is fixedly connected to the lead screw, the lead screw is in threaded cooperation with the nut, pulley B is installed at the lower end of the lead screw, and pulley B is arranged in cooperation with the guide shaft. Rotate the handwheel to make the lead screw rotate relative to the nut and move up and down at the same time. The lead screw drives pulley B to move up and down along the guide shaft; when pulley B moves downwards, it pushes the flexible rope to stretch downwards, lifts the counterweight, and forces the flexible rope to bear the tensile force; the positioning device includes a positioning frame and pulley C; a plurality of pulley C are provided, and a plurality of pulley C are installed on the positioning frame; the starting end of the flexible rope is tied to pulley A of the pre-tightening device close to the ground, the middle section bypasses pulley C on the positioning device, and the end section bypasses pulley A of the pre-tightening device far from the ground and is in a free state, with a counterweight hanging at the end; the weight of the counterweight is determined according to the working conditions of the flexible rope.

2. A method for pre-stretching a flexible rope according to claim 1, characterized in that: The pre-tightening frame is welded with angle aluminum or other metal materials.

3. A method for pre-stretching a flexible rope according to claim 1, characterized in that: Each support rod is formed by butt-jointing multiple sections of metal rods. The length of the support rod is determined according to the distance between the pre-tightening device and the positioning device.

4. A flexible rope pre-tensioning method according to claim 1, characterized in that: The positioning frame is welded with angle aluminum or other metal materials.

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