Indirectly cooled tower laser centering auxiliary wire device and auxiliary equipment

Abstract

The application relates to the technical field of intermediate cooling tower construction, in particular to an auxiliary wire twisting device and auxiliary equipment for laser centering of an intermediate cooling tower, which comprises a base, a wire twisting disc, a tension meter and an adjusting mechanism; the wire twisting disc is rotationally installed on the base, and a wire is wound on the wire twisting disc; the tension meter is connected with the free end of the wire; and the adjusting mechanism is arranged on the base and used for adjusting the tension degree of the wire. The application actively adjusts the tension degree of the wire by the adjusting mechanism, replaces the original mode of forcibly clamping into the ratchet tooth gap by relying on temporary tools such as steel bars and crowbars, thereby realizing stable maintenance of the tension force. Meanwhile, the setting of the tension meter enables an operator to read the actual tension value of the wire in real time and intuitively, not only avoids the risks of target shaking caused by too small tension and equipment damage caused by too large tension, but also makes balanced adjustment of the tension among multiple wires possible, and further guarantees the balance and positioning accuracy of the receiving target in the air.

Description

Technical Field

[0001] The present application relates to the technical field of indirect cooling tower construction, in particular to a laser alignment auxiliary strand winding device and auxiliary equipment for an indirect cooling tower. Background Art

[0002] The indirect cooling tower is a critical cooling structure in modern thermal power plants, and its cylinder usually adopts a hyperboloid reinforced concrete structure, which has good aerodynamic characteristics and structural stability. During the construction process, the indirect cooling tower needs to carry out concrete pouring operations section by section upwards. To ensure that the geometric center of the finally formed tower body can be precisely consistent with the design center, and ensure that the cylinder wall radius and perpendicularity of each construction section meet strict design requirements, a precise centering operation must be performed before the construction of each section. This process is realized by setting up a laser alignment instrument on the zero-meter layer at the center of the tower, emitting a laser reference line to the high-altitude construction layer, arranging a laser receiving target in the air of the construction layer, and setting up a laser plummet on the ground to confirm that the center of the target is the center of the indirect cooling tower. In order to initially pull and stabilize the receiving target near the theoretical center position, a set of ground-laid auxiliary strand winding device is required to pull the receiving target to achieve its temporary fixation. Therefore, the accuracy and efficiency of the centering operation directly depend on the reliability and controllability of the auxiliary strand winding device, which is the core of the construction quality control link.

[0003] At present, the core components of the auxiliary strand winding device widely used in the laser alignment process of indirect cooling towers mainly include a strand winding reel and a steel wire rope. Among them, as the core operating component, the strand winding reel usually consists of a main frame, a ratchet drum for winding the steel wire rope, and a handle for driving the drum to rotate. Its basic working principle is: the operator drives the ratchet drum to rotate by shaking the handle, so as to realize the winding or unwinding of the steel wire rope. By arranging a plurality of such devices on the ground and coordinating the winding and unwinding lengths of each steel wire rope, the two-dimensional coordinates of the high-altitude laser receiving target on the horizontal plane are adjusted to align it with the laser spot.

[0004] However, in practice, operators often need to forcibly insert temporary tools such as steel bars and crowbars into the ratchet tooth gaps, or adopt other non-standard and irregular fixing methods to prevent the strand winding reel from reversing. This practice not only greatly increases the complexity of operation, but also results in extremely unstable fixing effect, leading to the drift of the positioned laser receiving target, thus introducing alignment errors. Utility Model Content

[0005] In order to solve the problem that the traditional auxiliary strand winding device relies on temporary tools such as steel bars and crowbars to be forcibly inserted into the ratchet tooth gaps, which increases the operation complexity and leads to extremely unstable fixing effect, the present application provides a laser alignment auxiliary strand winding device and auxiliary equipment for an indirect cooling tower.

[0006] The technical solution provided in this application for an auxiliary stranding device and auxiliary equipment for laser centering in an intercooled tower is as follows: On one hand, an intercooled tower laser centering auxiliary stranding device includes: Base; A stranded wire spool is rotatably mounted on the base, and wire is wound on the stranded wire spool; A tension gauge, connected to the free end of the wire; and An adjustment mechanism, located on the base, is used to adjust the tension of the wire.

[0007] By adopting the above technical solution, the tension of the wire is actively adjusted using the adjustment mechanism located on the base, replacing the original method of forcibly wedging the ratchet teeth with temporary tools such as steel bars and crowbars. This achieves stable tension maintenance. At the same time, the tension gauge allows the operator to read the actual tension value of the wire in real time and intuitively. This not only avoids the risk of target shaking caused by insufficient tension or equipment damage caused by excessive tension, but also makes it possible to balance the tension of multiple wires, further ensuring the balance and accurate positioning of the receiving target in the air.

[0008] Optionally, the adjustment mechanism includes a primary adjustment component, the primary adjustment component comprising: The primary handle is connected to and rotates synchronously with the strand reel; and A primary positioning structure is used to position the primary handle after the primary handle is rotated to adjust the wire to the primary tension.

[0009] By adopting the above technical solution, the initial locking after tensioning is achieved through the primary positioning structure, transforming the traditional continuous and unstable manual holding operation into a mechanical operation that can be fixed in stages, significantly improving the convenience and initial stability of the operation.

[0010] Optionally, one end of the stranded coil is connected to the base via a first rotating shaft, and the other end is connected to a second rotating shaft. The second rotating shaft passes through the base and is connected to the primary handle. The primary handle can slide in the axial direction of the second rotating shaft and rotate synchronously with the second rotating shaft. The primary positioning structure includes a primary screw nut, and the second rotating shaft is provided with an external thread. The primary screw nut is threadedly connected to the second rotating shaft to press the primary handle against the base.

[0011] By adopting the above technical solution, the cooperation between the second rotating shaft with external thread and the screw nut generates huge axial pressure by tightening the nut, which presses the primary handle against the base. This achieves reliable self-locking by using friction. This structure is simple and has strong locking force, ensuring the stability of the primary tension state.

[0012] Optionally, the primary handle and the second rotating shaft are engaged via a spline structure.

[0013] By adopting the above technical solution, it is ensured that the primary handle can smoothly slide axially while transmitting torque synchronously with the second rotating shaft for line winding and unwinding operations.

[0014] Optionally, one side of the primary handle and the opposite side of the base is provided with a positioning part, and the other side is provided with a plurality of mating parts spaced apart in the circumferential direction. The positioning part and the mating parts cooperate to position the primary handle at a primary preset angle.

[0015] By adopting the above technical solution, when the nut is tightened to press the handle against the base, the positioning part will be embedded in the mating part to form a mechanical interlock. This greatly enhances the anti-reverse positioning strength, effectively prevents the handle from slipping under continuous tension or vibration, and ensures the long-term maintenance of the initial tension state.

[0016] Optionally, the adjustment mechanism includes a secondary adjustment component, the secondary adjustment component comprising: An adjusting wheel is movably mounted on the base, located to the side of the stranded wire reel, and the axis of the adjusting wheel is parallel to the axis of the stranded wire reel; and The secondary positioning structure is installed on the base and is used to position the adjusting wheel after the adjusting wheel moves to push the wire to the secondary tension level.

[0017] By adopting the above technical solution, since the primary positioning has already absorbed and offset the main tension of the wire, the secondary adjustment component only needs to overcome the remaining small tension fluctuations, thus eliminating the need for a large locking force. By using the movable adjustment wheel to slightly push or release the wire, stepless fine adjustment of the wire tension is achieved, thereby enabling higher tension control accuracy and meeting the stringent requirements of precise alignment.

[0018] Optionally, the adjusting wheel is a cam, and the secondary positioning structure includes: A bracket is mounted on the base, and the cam is rotatably mounted on the bracket; The secondary handle is coaxially and fixedly connected to the cam; and A positioning element is used to position the secondary handle after the secondary handle is rotated to bring the wire to the secondary tension level.

[0019] By adopting the above technical solution, the continuous variation of the cam profile radius is utilized to precisely convert the minute rotational motion of the secondary handle into a minute linear adjustment of the wire tension. This "small rotational input - micro linear output" transmission method is perfectly suited to the high precision and high resolution required for fine-tuning operations. Furthermore, because the required locking force is very small, the cam mechanism itself possesses a certain degree of self-locking after adjustment, and simple friction positioning is sufficient to fully meet the usage requirements.

[0020] Optionally, the secondary handle is provided with a threaded hole, and the positioning element includes a positioning bolt, which is threaded into the threaded hole and abuts against the bracket.

[0021] By adopting the above technical solution, given that the locking torque required after secondary adjustment is very small, the static friction generated by tightening the positioning bolt so that its end abuts against the bracket is sufficient to reliably fix the angle of the secondary handle, thereby stably maintaining the tension after fine adjustment. This solution is simple in structure, low in cost, and easy to operate.

[0022] Optionally, a friction pad is provided at the end of the positioning bolt facing the bracket.

[0023] By adopting the above technical solution, the reliability of locking is enhanced by increasing the coefficient of friction, preventing the bolts from loosening under vibration. On the other hand, it avoids the wear or damage that may be caused by the direct friction between the metal bolts and the bracket, thus protecting the parts and extending their service life.

[0024] On the other hand, an intercooled tower laser centering auxiliary device includes: A laser receiving target is used to be placed at the center of the construction layer of the indirect cooling tower. Multiple auxiliary components, including the laser centering auxiliary stranded wire device and pulleys of the indirect cooling tower as described above; the multiple laser centering auxiliary stranded wire devices of the indirect cooling tower are spaced apart in the circumferential direction and are arranged on the ground at the center of the indirect cooling tower; the pulleys are arranged one-to-one with the laser centering auxiliary stranded wire devices of the indirect cooling tower and are installed on the inner side wall above the construction layer of the indirect cooling tower, and the free end of the wire is wound around the corresponding pulley and connected to the laser receiving target.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up an adjustment mechanism and cooperating with a tension gauge, active, precise and visual control of the tension of the wires is achieved, replacing the traditional method of relying on temporary steel bars for fixing. This not only makes the operation safe and reliable, but also allows for precise equalization of the tension of multiple wires through real-time tension data display, thereby ensuring the stability and centering accuracy of the laser receiving target in the air.

[0026] 2. By adopting a primary adjustment component that includes a primary handle and a primary positioning structure, and combining a multi-locking mechanism of spline connection, threaded tightening and clamping, and engagement of positioning part and mating part, the initial tensioning and fixing of the wire is achieved, effectively preventing the receiving target from drifting due to the rotation of the stranded coil under the main force.

[0027] 3. By adding a secondary adjustment component consisting of a cam and a friction positioning element, the cam's characteristics are used to convert the minute rotation of the handle into linear tension fine-tuning. With its small locking force, the fine-tuning state can be stably maintained by simple bolt friction positioning. Thus, stepless fine control of tension is achieved with a simple mechanism, meeting the stringent requirements of precise alignment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the auxiliary equipment in the intercooling tower in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the laser centering auxiliary stranding device for the indirect cooling tower in the embodiments of this application; Figure 3 This is a cross-sectional schematic diagram showing the primary adjustment component in an embodiment of this application; Figure 4 yes Figure 2 A magnified view of a portion of point A in the middle.

[0029] Explanation of reference numerals in the attached figures: 1. Base; 11. Fitting part; 2. Stranding reel; 21. Second rotating shaft; 22. Spline structure; 3. Adjustment mechanism; 31. Primary adjustment component; 311. Primary handle; 312. Primary screw nut; 313. Positioning part; 32. Secondary adjustment component; 321. Adjusting wheel; 322. Bracket; 323. Secondary handle; 324. Positioning component; 10. Laser receiving target; 20. Indirect cooling tower laser centering auxiliary stranding device; 30. Pulley. Detailed Implementation

[0030] The following will be combined with the appendix Figure 1-4 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] This application discloses a laser centering auxiliary stranding device 20 for indirect cooling towers and auxiliary equipment including the device. The core function of this auxiliary equipment is to accurately position and stabilize the laser receiving target 10 at the center of the high-altitude construction layer of the indirect cooling tower. The entire auxiliary equipment mainly includes the laser receiving target 10 and multiple auxiliary components arranged around the center of the indirect cooling tower. Taking four commonly used auxiliary components as an example, such as... Figure 1 As shown, each auxiliary component includes a laser centering auxiliary stranded wire device 20 for the indirect cooling tower according to this embodiment and a pulley 30. Four laser centering auxiliary stranded wire devices 20 are arranged circumferentially at intervals on the ground, while four pulleys 30 are correspondingly installed on the inner wall above the construction layer of the indirect cooling tower. The wire in the stranded wire device extends upwards, passes around the corresponding pulley 30, and finally connects to the laser receiving target 10 located on the construction layer.

[0032] Since all four pulleys 30 are located above the laser receiving target 10, the laser receiving target 10 is pulled by four wires. By adjusting the extension length of the wires on the four twisted wire devices, the laser receiving target 10 can be pulled in the horizontal plane so that its center coincides with the laser spot emitted from the ground laser transmitter, thereby completing the centering.

[0033] To achieve precise and reliable control of wire length and tension, such as Figure 2 As shown, the laser centering auxiliary stranding device 20 of the intercooling tower in this embodiment includes a base 1, a stranding disc 2, a tension gauge (not shown in the figure), and an adjustment mechanism 3.

[0034] The base 1 provides a stable mounting foundation for the entire device. The stranded wire reel 2 is rotatably mounted on the base 1 via a rotating shaft. Specifically, one end of the stranded wire reel 2 is rotatably connected to the base 1 via a first rotating shaft, and the other end is rotatably connected to the base 1 via a second rotating shaft 21. The second rotating shaft 21 is fixedly connected to the stranded wire reel 2 and can be connected to the base 1 via a bearing. A wire for pulling the laser receiving target 10 is wound on the stranded wire reel 2. The free end of the wire is connected to a tension gauge, which can display the tension value of the wire in real time.

[0035] Understandably, in one alternative embodiment, to achieve centralized monitoring and coordinated adjustment of tension, the tension gauge on each stranding device is connected to a central control display via wired or wireless means. This control display can receive and synchronously display tension values ​​from all stranding devices in real time. Operators can gain a comprehensive understanding of the tension distribution throughout the entire traction system simply by observing the control display.

[0036] Four pulleys 30 are installed above the construction layer of the indirect cooling tower on the inner wall at the same horizontal level, and are evenly and symmetrically distributed in a 90-degree circumference around the design center. After the laser receiving target 10 is initially positioned in the center by adjusting the wire length, the operator can finely operate the adjustment components of each stranded wire device to make fine adjustments based on the four tension values ​​fed back in real time on the control display, so that the values ​​displayed by the four tension gauges are consistent. When the tension of the four wires is balanced, the laser receiving target 10 is subjected to uniform tension from four directions, and its center position precisely coincides with the theoretical center of the tower, reaching a stable equilibrium state.

[0037] The adjustment mechanism 3 is mounted on the base 1 and is used for fine-tuning the tension of the wire. In this embodiment, the adjustment mechanism 3 integrates two-stage adjustment functions to achieve full-process control from coarse adjustment to fine adjustment.

[0038] The first stage is the primary adjustment component 31, whose main function is to quickly extend and retract the wire length and perform initial tensioning. This component includes a primary handle 311 and a primary positioning structure.

[0039] like Figure 3 As shown, the second rotating shaft 21 passes through the base 1 and is connected to the primary handle 311. The primary handle 311 can slide along the axis of the second rotating shaft 21 and rotate synchronously with the second rotating shaft 21. Specifically, the primary handle 311 is engaged with the second rotating shaft 21 through a spline structure 22, so that the primary handle 311 can both rotate synchronously with the second rotating shaft 21 to drive the stranding reel 2 to take in and unwind the wire, and slide along the axis of the second rotating shaft 21.

[0040] The primary positioning structure includes a primary screw nut 312, and the second rotating shaft 21 is provided with an external thread. The primary screw nut 312 is threadedly connected to the second rotating shaft 21. After the primary handle 311 is cranked to adjust the wire to the required primary tension, the operator can tighten the primary screw nut 312 to firmly press the primary handle 311 against the base 1.

[0041] To further enhance the locking effect and provide precise angle positioning, one side of the primary handle 311 and the base 1 opposite each other has a positioning part 313, and the other side has multiple circumferentially spaced mating parts 11. The positioning part 313 and the mating parts 11 cooperate to position the primary handle 311 at a preset primary angle. For example, one side has a protrusion as the positioning part 313, and the other side has multiple circumferentially spaced grooves as the mating parts 11. When the primary screw nut 312 is tightened, the protrusion engages with the groove. This mechanical interlocking structure greatly enhances the positioning strength, prevents accidental slight rotation of the handle under continuous tension, and ensures long-term stability of the primary tension state. The number and size of the protrusions and grooves can be set according to the adjustment accuracy.

[0042] In other embodiments, the positioning part 313 can be a groove, and the mating part 11 can be a corresponding protrusion. The positioning part 313 can be provided on the primary handle 311, and the mating part 11 can be provided on the base 1.

[0043] The second stage is the secondary adjustment component 32, which, based on the primary tensioning, provides finer adjustments to the wire tension. This component includes an adjustment wheel 321 and a secondary positioning structure. In a preferred embodiment, such as... Figure 4 As shown, the adjusting wheel 321 is a cam, and a bracket 322 is fixed on the base 1. The cam is rotatably mounted on the bracket 322 (connected by a rotating shaft and bearing) and located on the side of the stranded coil 2, with its axis parallel to the axis of the stranded coil 2. The secondary positioning structure includes a secondary handle 323 fixed coaxially with the cam and a positioning element 324. The positioning element 324 can be a positioning bolt threaded onto the secondary handle 323.

[0044] When the secondary handle 323 is rotated, the cam rotates. By changing the cam's radius, it engages or disengages the wire radially on the strand reel 2, allowing the operator to finely adjust the wire tension with minimal torque. When the tension reaches the ideal secondary tension, simply tighten the positioning bolt until its end firmly abuts against the bracket 322. The resulting friction will then fix the cam in place. To further enhance friction and protect components, a friction pad can be added to the end of the positioning bolt. The operator can balance the tension of each wire with extremely high precision, ensuring the laser receiving target 10's final stability and precise alignment in the air.

[0045] In other alternative embodiments, the installation and adjustment method of the adjusting wheel 321 can be different to achieve the same fine tensioning purpose. In this embodiment, the adjusting wheel 321 is not a cam structure, but is designed as a common guide wheel. The adjusting wheel 321 can not only rotate around its own axis, but is also mounted on a slider that can move radially along the strand spool 2.

[0046] The operator directly changes the relative position of the adjusting wheel 321 to the wire exit point on the stranded reel 2 by moving the adjusting wheel 321 radially. When the adjusting wheel 321 moves away from the stranded reel 2, it creates a reverse resistance on the section of wire passing over it, effectively increasing the wire's wrap angle or effective path. This tightens the wire section from the adjusting wheel 321 to the laser receiving target 10 without rotating the stranded reel 2 itself, achieving a slight increase in tension. Conversely, moving the adjusting wheel 321 closer to the stranded reel 2 releases some tension on the wire, causing a slight decrease in tension.

[0047] To position the adjusting wheel 321 in the desired radial position to maintain tension, its secondary positioning structure typically employs a linear locking mechanism. For example, a through-hole threaded hole can be provided on the slider, equipped with a locking bolt. Once the adjusting wheel 321 is moved to the target position, thereby adjusting the wire tension to the expected secondary tension, simply tighten the locking bolt, pressing its end firmly against the slide rail or mounting surface of the base 1. The resulting friction reliably locks the radial position of the adjusting wheel 321, preventing it from retracting under tension.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not 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 application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser centering auxiliary stranding device for an indirect cooling tower, characterized in that, include: Base (1); A stranded wire reel (2) is rotatably mounted on the base (1), and wire is wound on the stranded wire reel (2); A tension gauge, connected to the free end of the wire; and An adjustment mechanism (3) is provided on the base (1) for adjusting the tension of the wire.

2. The laser centering auxiliary stranding device for indirect cooling towers according to claim 1, characterized in that, The adjustment mechanism (3) includes a primary adjustment component (31), which includes: The primary handle (311) is connected to and rotates synchronously with the stranded wire reel (2); and A primary positioning structure is used to position the primary handle (311) after the wire is adjusted to the primary tension by rotating the primary handle (311).

3. The laser centering auxiliary stranding device for indirect cooling towers according to claim 2, characterized in that, One end of the stranded coil (2) is connected to the base (1) via a first rotating shaft, and the other end is connected to a second rotating shaft (21). The second rotating shaft (21) passes through the base (1) and is connected to the primary handle (311). The primary handle (311) can slide in the axial direction of the second rotating shaft (21) and rotate synchronously with the second rotating shaft (21). The primary positioning structure includes a primary screw nut (312), the second rotating shaft (21) is provided with an external thread, and the primary screw nut (312) is threadedly connected to the second rotating shaft (21) to abut the primary handle (311) against the base (1).

4. The laser centering auxiliary stranding device for indirect cooling towers according to claim 3, characterized in that, The primary handle (311) and the second rotating shaft (21) are engaged by a spline structure (22).

5. The laser centering auxiliary stranding device for indirect cooling towers according to claim 3, characterized in that, On the opposite sides of the primary handle (311) and the base (1), one side is provided with a positioning part (313), and the other side is provided with a plurality of mating parts (11) spaced apart in the circumferential direction. The positioning part (313) and the mating part (11) cooperate to position the primary handle (311) at a primary preset angle.

6. The laser centering auxiliary stranding device for indirect cooling towers according to claim 2, characterized in that, The adjustment mechanism (3) includes a secondary adjustment component (32), which includes: An adjusting wheel (321) is movably mounted on the base (1), located to the side of the stranded wire reel (2), and the axial direction of the adjusting wheel (321) is parallel to the axis of the stranded wire reel (2); and The secondary positioning structure is installed on the base (1) and is used to position the adjusting wheel (321) after the adjusting wheel (321) moves to push the wire to the secondary tension level.

7. The laser centering auxiliary stranding device for indirect cooling towers according to claim 6, characterized in that, The adjusting wheel (321) is a cam, and the secondary positioning structure includes: A bracket (322) is mounted on the base (1), and the cam is rotatably mounted on the bracket (322); The secondary handle (323) is coaxial with and fixedly connected to the cam; and Positioning element (324) is used to position the secondary handle (323) after the secondary handle (323) is rotated to abut the wire to the secondary tension level.

8. The laser centering auxiliary stranding device for indirect cooling towers according to claim 7, characterized in that, The secondary handle (323) is provided with a threaded hole, and the positioning member (324) includes a positioning bolt, which is threadedly connected to the threaded hole and abuts against the bracket (322).

9. The laser centering auxiliary stranding device for indirect cooling towers according to claim 8, characterized in that, The end of the positioning bolt facing the bracket (322) is provided with a friction pad.

10. A laser centering auxiliary device for an indirect cooling tower, characterized in that, include: A laser receiving target (10) is used to be set at the center of the construction layer of the intercooling tower; Multiple auxiliary components, including a laser centering auxiliary stranded wire device (20) and a pulley (30) as described in any one of claims 1 to 9 for indirect cooling towers; multiple laser centering auxiliary stranded wire devices (20) are spaced apart in the circumferential direction and are arranged on the ground at the center of the indirect cooling tower; the pulley (30) is arranged in a one-to-one correspondence with the laser centering auxiliary stranded wire device (20) for installation on the inner side wall above the construction layer of the indirect cooling tower, and the free end of the wire is wound around the corresponding pulley (30) and connected to the laser receiving target (10).

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