A pre-tensioning ladder pressing method and device

Abstract

The application discloses a pre-tensioning ladder pressure compacting method and device, and belongs to the technical field of tensioning methods, which comprises the following steps: S1: a section of steel wire rope to be tensioned is not applied with a compacting force; S2: a fixed end compacting piece located at the outermost side and a moving end compacting piece located at the outermost side are pressed down, a compacting force P is applied, the moving end compacting piece is moved, a tension force F1 is applied to the steel wire rope, and the elongation of the steel wire rope is ΔX1; S3: a fixed end compacting piece and a moving end compacting piece located at the inner side are pressed down, the compacting force P is applied, the moving end compacting piece is synchronously moved, a tension force F1+F2 is applied to the steel wire rope, and the elongation of the steel wire rope is ΔX2; and S4: the steps are sequentially repeated until a fixed end compacting piece and a moving end compacting piece located at the innermost side are pressed down, the compacting force P is applied, the moving end compacting piece is synchronously moved, and a tension force F1+F2+…+F N The application reduces the relative displacement of the steel wire rope between two adjacent compacting pieces and improves the consistency of the friction between the compacting pieces.

Description

Technical Field

[0001] This invention relates to the field of tensioning methods, and in particular to a pre-tensioning stepped compression method and apparatus. Background Technology

[0002] After steel wire ropes are twisted and formed on the production line, due to their spiral winding structure, structural loosening is inevitable. This causes unpredictable changes in length during use. Therefore, in most applications that require precise length control, a pre-tensioning process is necessary to eliminate structural elongation of the steel wire rope.

[0003] Pre-tensioning refers to the process of applying a load equivalent to approximately 10%-40% of the breaking strength of the wire rope after it has been twisted, and maintaining that load. Finished wire ropes are relatively long (approximately 1000 meters in a coil). Wire rope pre-tensioning equipment typically consists of two parts: a take-up end and a release end. The length of the middle section is determined by the size of the site, and the wire rope needs to be stretched segment by segment. Lever-type clamping structures are rationally designed, with clamping blocks distributed along a certain length, resulting in high friction and the ability to generate significant tension force on the wire rope. They offer many advantages and are widely used.

[0004] However, during the tensioning process, under the action of a large tension force, the wire rope between two adjacent clamping blocks will also elongate, resulting in displacement between the wire rope and the clamping blocks. Since the clamping force between the clamping blocks and the wire rope is large, the friction is also large, which will cause wear on the clamping blocks. The wear of the clamping blocks closer to the inside is greater. Moreover, the friction provided by each clamping block is not equal. The friction generated by the next clamping block depends on the displacement of the adjacent previous clamping block (along the wire rope towards the center of the equipment). In addition, it will also cause some damage to the wire rope.

[0005] To address this, a pre-tensioning stepped compression method and its apparatus are proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a pre-tensioning stepped compression method and apparatus, which aims to solve or improve at least one of the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a pre-tensioning stepped compression method,

[0008] Includes the following steps:

[0009] S1: Place the section of the wire rope to be tensioned on N fixed end clamping members and N movable end clamping members, without applying clamping force;

[0010] S2: Press down the outermost fixed end clamping member and the outermost movable end clamping member to clamp the wire rope, apply clamping force P, the movable end clamping member moves, apply tension force F1 to the wire rope, and the wire rope elongation ΔX1.

[0011] S3: Press down the adjacent fixed end clamping parts and moving end clamping parts on the inner side to clamp the wire rope and apply clamping force P. The moving end clamping parts move synchronously to apply tension force F1+F2 to the wire rope, and the wire rope elongates to ΔX2.

[0012] S4: Continue in this manner until the innermost fixed-end clamping member and the moving-end clamping member are pressed down, clamping the wire rope and applying a clamping force P. The moving-end clamping member moves synchronously, applying a tension force F1+F2+……+F to the wire rope. N The elongation of the wire rope to ΔX N ;

[0013] The total preload required for the wire rope is F. 拉 F1+F2+……+F N equals F 拉 .

[0014] Preferred, F1, F2...F N The values ​​are equal, both being F / N.

[0015] Preferably, the pressure P is set based on the friction coefficient of the wire rope.

[0016] A pre-tensioning stepped clamping device is also provided, comprising N fixed-end clamping members and N movable-end clamping members, wherein the N fixed-end clamping members and the N movable-end clamping members are arranged sequentially along the tension direction of the wire rope.

[0017] Preferably, a slide base is provided below the mobile end clamping member, a slide is slidably connected to the slide base, a driving member connected to the slide is provided on the slide base, and N mobile end clamping members are fixedly connected to the slide; N fixed end clamping members are fixedly connected to the fixed base.

[0018] Preferably, the moving end clamping member and the fixed end clamping member each include a connecting platform. The connecting platform on the moving end clamping member is fixedly connected to the top of the slide table, and the connecting platform on the fixed end clamping member is fixedly connected to the top of the fixed base. A lower pressing block is fixedly connected to the top of the connecting platform, and an upper pressing block is rotatably connected to the connecting platform. A driving part is provided on the connecting platform. The driving part is connected to the upper pressing block and drives the upper pressing block to approach or move away from the top of the lower pressing block. Through grooves are respectively opened on the side walls opposite to the upper pressing block and the lower pressing block, and a steel wire rope is pressed between the two through grooves.

[0019] Preferably, the driving unit includes a clamping hydraulic cylinder hinged to one side of the connecting platform. A support rod is hinged to the piston rod of the clamping hydraulic cylinder. The end of the support rod away from the clamping hydraulic cylinder is fixedly connected to the upper pressure block. The support rod is rotatably connected to the connecting platform through a rotating shaft. The upper pressure block and the clamping hydraulic cylinder are located on both sides of the rotating shaft, respectively.

[0020] Preferably, the distance from the connection point between the upper pressure block and the support rod to the rotating shaft is less than the distance from the connection point between the clamping hydraulic cylinder and the support rod to the rotating shaft.

[0021] Preferably, the distance between two adjacent pressing blocks on the fixed base is S1, and the distance between two adjacent pressing blocks on the slide is S2, where S1 and S2 are equal.

[0022] Preferably, the driving component includes a driving cylinder fixedly connected to the slide base, and the piston rod of the driving cylinder is fixedly connected to the slide.

[0023] The present invention discloses the following technical effects: When tensioning a wire rope, a method is adopted in which a fixed end clamping member and a moving end clamping member are used to clamp the wire rope in a stepwise manner and gradually increase the tensile force. By using this method, the relative displacement of the wire rope between two adjacent clamping members is reduced when tensioning the wire rope, the consistency of the friction force between each clamping member is improved, the equipment performance is improved, the wear of the clamping members is reduced, and the quality of the wire rope is improved. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a top view of the present invention;

[0027] Figure 3 This is the left-side view of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the present invention at step S3;

[0029] Figure 5 This is a schematic diagram of the structure of the present invention at step S4.

[0030] In the diagram: 1. Fixed end clamping component; 2. Moving end clamping component; 3. Steel wire rope; 4. Slide base; 5. Slide; 6. Connecting platform; 7. Lower pressure block; 8. Upper pressure block; 9. Through slot; 10. Rotary shaft; 11. Clamping hydraulic cylinder; 12. Support rod; 13. Drive cylinder; 14. Fixed base. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1-5 This invention provides a pre-tensioning stepwise compression method, comprising the following steps:

[0034] S1: Place the section of the wire rope 3 to be tensioned on N fixed end clamping parts 1 and N moving end clamping parts 2, without applying clamping force;

[0035] S2: Press down the outermost fixed end clamping member 1 and the outermost movable end clamping member 2 to clamp the wire rope 3, apply clamping force P, the movable end clamping member 2 moves, apply tension force F1 to the wire rope 3, and the wire rope 3 elongates by ΔX1.

[0036] S3: Press down the adjacent fixed end clamping member 1 and the moving end clamping member 2 on the inner side to clamp the wire rope 3 and apply clamping force P. The moving end clamping member 2 moves synchronously to apply tension force F1+F2 to the wire rope 3 and the wire rope 3 elongates to ΔX2.

[0037] S4: Continue in this manner until the innermost fixed end clamping member 1 and the moving end clamping member 2 are pressed down, clamping the wire rope 3 and applying a clamping force P. The moving end clamping member 2 moves synchronously, applying a tension force F1+F2+……+F to the wire rope 3. N The elongation of the steel wire rope 3 to ΔX N ;

[0038] The total preload required for wire rope 3 is F. 拉 F1+F2+……+F N equals F 拉 ;

[0039] When tensioning the wire rope 3, a method is adopted to tighten it in stages using the fixed end clamping member 1 and the moving end clamping member 2, and to gradually increase the tensile force. This method reduces the relative displacement of the wire rope 3 between two adjacent clamping members, improves the consistency of friction between each clamping member, enhances equipment performance, reduces wear on the clamping members, and improves the quality of the wire rope.

[0040] Further optimize the scheme, F1, F2...F N The values ​​are equal, both being F. 拉 / N.

[0041] In step S2, F is applied. 拉 A tension of / N is applied in S3 at a rate of 2F. 拉 The pulling force is / N, and so on, gradually increasing, so that the frictional force contributed by each fixed end clamping member 1 and the moving end clamping member 2 is the same.

[0042] The scheme was further optimized, and the pressure P was set based on the friction coefficient of the steel wire rope 3.

[0043] A pre-tensioning stepped clamping device is also provided, comprising N fixed-end clamping members 1 and N movable-end clamping members 2, wherein the N fixed-end clamping members 1 and the N movable-end clamping members 2 are arranged sequentially along the tensioning direction of the wire rope 3.

[0044] In a further optimized design, a slide base 4 is provided below the mobile end clamping component 2, a slide 5 is slidably connected to the slide base 4, a drive component connected to the slide 5 is provided on the slide base 4, and N mobile end clamping components 2 are fixedly connected to the slide 5; N fixed end clamping components 1 are fixedly connected to the fixed base 14.

[0045] In a further optimized design, the mobile end clamping component 2 and the fixed end clamping component 1 each include a connecting platform 6. The connecting platform 6 on the mobile end clamping component 2 is fixedly connected to the top of the slide table 5, and the connecting platform 6 on the fixed end clamping component 1 is fixedly connected to the top of the fixed base 14. A lower pressing block 7 is fixedly connected to the top of the connecting platform 6, and an upper pressing block 8 is rotatably connected to the connecting platform 6. A driving part is provided on the connecting platform 6. The driving part is connected to the upper pressing block 8 and drives the upper pressing block 8 to approach or move away from the top of the lower pressing block 7. Through grooves 9 are respectively opened on the side walls opposite to the upper pressing block 8 and the lower pressing block 7. The steel wire rope 3 is pressed between the two through grooves 9.

[0046] In a further optimized design, the drive unit includes a clamping hydraulic cylinder 11 hinged to one side of the connecting platform 6. A support rod 12 is hinged to the piston rod of the clamping hydraulic cylinder 11. The end of the support rod 12 away from the clamping hydraulic cylinder 11 is fixedly connected to the upper pressure block 8. The support rod 12 is rotatably connected to the connecting platform 6 through a rotating shaft 10. The upper pressure block 8 and the clamping hydraulic cylinder 11 are located on both sides of the rotating shaft 10, respectively.

[0047] Further optimization of the scheme: the distance from the connection point of the upper pressure block 8 and the support rod 12 to the rotating shaft 10 is less than the distance from the connection point of the clamping hydraulic cylinder 11 and the support rod 12 to the rotating shaft 10.

[0048] The clamping hydraulic cylinder 11 forms a lever with the rotating shaft 10 through the support rod 12 to increase the clamping force.

[0049] In a further optimized design, the distance between two adjacent pressing blocks 7 on the fixed base 14 is S1, and the distance between two adjacent pressing blocks 7 on the slide table 5 is S2, with S1 and S2 being equal.

[0050] The scheme is further optimized. The driving component includes a driving cylinder 13 fixedly connected to the slide base 4, and the piston rod of the driving cylinder 13 is fixedly connected to the slide 5.

[0051] In use, the steel wire rope 3 is tensioned in sections. The tensioned steel wire rope 3 is placed on the wire feeder for section feeding. The tensioned steel wire rope 3 is collected by the wire take-up device. The fixed end clamping member 1 is close to the wire feeder, and the moving end clamping member 2 is close to the wire take-up device. N sets of fixed end clamping members 1 and moving end clamping members 2 are respectively provided.

[0052] When tensioning a steel wire rope with a diameter φ, the required pre-tensioning force is set to F. 拉 The clamping hydraulic cylinders 11 on the outermost fixed end clamping member 1 and the moving end clamping member 2 are activated, causing the upper pressure block 8 to engage with the top of the lower pressure block 7, clamping the wire rope 3. A pressure P is preset according to the wire rope's friction coefficient. Subsequently, the drive cylinder 13 is activated, moving the slide table 5 and applying pressure F to the wire rope 3. 拉 With a tension of 1 / N, the wire rope elongates by ΔX1 within the clamping length L; Figure 1 As shown;

[0053] When the detected tension reaches F 拉 When / N, the clamping hydraulic cylinders 11 on the adjacent fixed end clamping member 1 and the moving end clamping member 2 are activated to apply clamping force P, thereby clamping the wire rope 3. Under the action of the drive cylinder 13, the slide table 5 continues to move, and the tension applied to the wire rope increases to 2F. 拉 / N, At this point, within the clamping length L, the elongation of the wire rope reaches ΔX2, such as Figure 4 ;

[0054] This process continues until the innermost fixed-end clamping member 1 and the moving-end clamping member 2 are pressed down, applying a clamping force P to press the wire rope 3 tightly, until the wire rope 3 reaches the preset tension value F. 拉 The elongation of the wire rope over a length L reaches ΔX. n ;like Figure 5 .

[0055] In conventional pretensioning equipment, since the wire rope 3 is tightened before the tension force F is applied... 拉 This ΔX n The wire rope 3 is pulled out entirely from between the pressure blocks, especially on the inner side, near the middle of the two sets of pressure blocks, which will experience severe wear. The slipped wire rope 3 will also be locally damaged (which may be a fatal defect for high-end wire ropes). Moreover, the friction (tension) contributed by each set of pressure blocks depends on the displacement generated on the adjacent inner side. With the stepped clamping method of this application, this displacement falls entirely outside the pressure blocks, and the friction contributed by each set of pressure blocks is the same. Under the same hydraulic power, the effective tension generated by the equipment is larger. The equipment has less pressure block wear and lower operating costs.

[0056] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0057] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A pre-tensioning stepwise compaction method, characterized in that: Includes the following steps: S1: Place the section of the wire rope (3) to be tensioned on N fixed end clamping parts (1) and N moving end clamping parts (2), without applying clamping force; S2: Press down the outermost fixed end clamping member (1) and the outermost movable end clamping member (2) to clamp the wire rope (3), apply clamping force P, the movable end clamping member (2) moves, apply tension force F1 to the wire rope (3), and the wire rope (3) elongates by ΔX1. S3: Press down the adjacent fixed end clamping member (1) and moving end clamping member (2) on the inner side to clamp the wire rope (3) and apply clamping force P. The moving end clamping member (2) moves synchronously to apply tension force F1+F2 to the wire rope (3) and the wire rope (3) elongates to ΔX2. S4: Continue in this manner until the innermost fixed end clamping member (1) and the moving end clamping member (2) are pressed down, so that they clamp the wire rope (3) and apply clamping force P. The moving end clamping member (2) moves synchronously, applying tension F1+F2+……+F to the wire rope (3). N The elongation of the wire rope (3) up to ΔX N ; The total preload required for the wire rope (3) is F. 拉 F1+F2+……+F N equals F 拉 ; F1, F2...F N The values ​​are equal, both being F. 拉 / N.

2. The pre-tensioning stepwise compression method according to claim 1, characterized in that: The pressure P is set according to the friction coefficient of the wire rope (3).

Images