Method for positioning a pulley in a lifting platform system

Abstract

The application relates to a positioning method of pulleys in a lifting platform system, which comprises the following steps: temporarily fixing each pulley and a supporting head bolt; installing a steel wire; installing a positioning tool at an in-out rope groove of each pulley; detecting the in-out rope angle of each pulley through a ruler and the positioning tool; and fixing the pulley shell to the structure of the lifting platform system by adjusting the position of the pulley through the supporting head bolt. The positioning method of the pulleys in the lifting platform system has a reference measuring point for all the pulleys, the use condition of an actual steel cable is simulated through the steel wire, the in-out rope angle of each pulley is detected through the ruler, the pulley reaches the best positioning requirement, and a solid foundation is laid for the normal operation of the subsequent lifting platform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shipbuilding, in particular to a positioning method of pulleys in a lifting platform system. BACKGROUND

[0002] With the actual demand of large ship channel transportation system being higher and higher, many ships under construction are equipped with lifting platform systems for the transfer of materials, vehicles and personnel. The lifting system is equipped with multiple pulleys. The pulleys are connected in series by steel ropes, and serve as the intermediate hub connecting the hydraulic drive unit and the lifting platform, playing a key role. The lifting platform is provided with a lifting locking device (the end of the steel rope is connected to the platform interface), the steel rope passes through several pulleys and is connected to the hydraulic drive unit. The operation of the hydraulic unit retracts the steel rope, drives each pulley in the middle link to rotate, and finally realizes the function of platform lifting operation. Since the in-out rope angle of the steel rope at each pulley is required to be within 2 degrees, the positioning size of the pulley measured by a tape measure cannot meet the requirements. If the in-out rope angle is measured by pulling the steel rope, it is basically impossible to achieve because the steel rope is too thick and it is difficult to adjust after being installed on the pulley. SUMMARY

[0003] To solve the technical problems in the prior art, the present application provides a positioning method of pulleys in a lifting platform system, which adjusts all the pulleys in the lifting platform system and ensures that the in-out rope angle of each pulley is controlled within 2 degrees.

[0004] To achieve the above-mentioned purpose, the technical solution of the present application is as follows:

[0005] A positioning method of pulleys in a lifting platform system, comprising the following steps:

[0006] Step 1: temporarily fix each pulley on the structure of the lifting platform system with a C-type clamp, and temporarily fix a branch bolt around the shell of each pulley;

[0007] Step 2: bind a steel wire at the end of the hydraulic cylinder in the lifting platform system, pass the steel wire through each pulley in turn, and pull it to the lifting locking device of the lifting platform system;

[0008] Step 3: install a positioning tool at the in-out rope groove of each pulley, and the positioning tool is detachably connected with the pulley;

[0009] Step 4: detect the in-out rope angle of each pulley by a ruler and the positioning tool;

[0010] Step 5: after the measurement is completed, remove the positioning tool, adjust the position of the pulley through the branch bolt, so that the in-out rope angle of each pulley meets the requirements, and fix the pulley shell to the structure of the lifting platform system.

[0011] As a preferred technical scheme, in step three, the positioning tool comprises two limiting blocks, the two limiting blocks are respectively clamped at the entering and exiting rope grooves of the pulley, one side of the limiting block matches the groove of the pulley, and the other side of the limiting block is provided with a semicircular groove, the semicircular groove is located on the center line of the limiting block, and the steel wire passes through the semicircular grooves on the two limiting blocks.

[0012] As a preferred technical scheme, the depth of the semicircular groove is 10-15mm.

[0013] As a preferred technical scheme, the positioning tool is made of nylon.

[0014] As a preferred technical scheme, in step four, the entering and exiting rope angle of the pulley is detected by the combination of the ruler and the positioning tool, and the step comprises the following steps: the ruler is placed on one side of the pulley, a measuring point is selected on the ruler, the distance from the measuring point to the pulley is h, the vertical distance from the entering and exiting rope of the pulley to the measuring point is a, and then the entering and exiting rope angle of the steel wire is Arctan(a / h).

[0015] As a preferred technical scheme, the measuring point is arranged at a distance of 300-500mm from the pulley.

[0016] Compared with the prior art, the method has the following beneficial effects:

[0017] (1) The positioning method of the pulley in the lifting platform system makes all the pulleys have a reference measuring point, the actual use of the steel cable is simulated by pulling the steel wire, the entering and exiting rope angle of each pulley is detected by the ruler, the pulley reaches the best positioning requirement, and a solid foundation is laid for the normal operation of the subsequent lifting platform.

[0018] (2) The positioning tool in the positioning method of the pulley in the lifting platform system uses the principle of two points and one line, so that the final installation position of each pulley can be determined in the whole lifting system steel wire stringing process, and the positioning tool itself is simple to manufacture, convenient to install and high in precision. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the arrangement of the pulley in the lifting platform system of the application;

[0020] Figure 2 is a schematic view of the installation position of the positioning tool in the lifting platform system of the application;

[0021] Figure 3 is an operation schematic view of step four of the positioning method of the pulley in the lifting platform system of the application;

[0022] Figure 4 is Figure 3 the enlarged view of A of

[0023] In the diagram: 1. Hydraulic cylinder; 2. Pulley; 21. Housing; 22. Support bolt; 3. Steel wire; 4. Cutting tool; 5. Positioning fixture. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0025] like Figure 1 As shown, a method for positioning pulley 2 in a lifting platform system includes the following steps:

[0026] Step 1: Use C-type calipers to temporarily fix each pulley 2 to the structure of the lifting platform system. Temporarily fix adjustment support bolts 22 around the outer shell 21 of each pulley 2. Specifically, each pulley 2 has a screw hole around its outer shell, and the inner ring of the screw hole has a thread that matches the support bolt 22. The four support bolts 22 pass through the four screw holes respectively, and the position of the pulley 2 is adjusted by the support bolts 22.

[0027] Step 2: Tie the steel wire 3 to the end of the hydraulic cylinder 1 in the lifting platform system, and then pass the steel wire 3 around each pulley 2 in turn and pull it to the lifting locking device of the lifting platform system.

[0028] Step 3, as Figure 2 As shown, a positioning fixture 5 is installed at the inlet / outlet rope groove of each pulley 2. The positioning fixture 5 is made of nylon, which is tough and easy to process. The positioning fixture 5 includes two limiting blocks. The two limiting blocks are respectively clamped at the inlet / outlet rope groove of the pulley 2. A little glue can be applied to fix them to ensure that the limiting blocks will not fall off during the measurement process. The size of one side of the limiting block matches the groove of the pulley 2. The other side of the limiting block is provided with a semi-circular groove. The semi-circular groove is located on the center line of the limiting block. The steel wire 3 passes through the semi-circular groove on the two limiting blocks. The depth of the semi-circular groove is 10-15mm. In this embodiment, the depth of the semi-circular groove is 14mm.

[0029] Step four, as Figure 3 and 4 As shown, a measuring point is selected on the cutter ruler 4 on one side of pulley 2, at a distance of 500-3300 mm from pulley 2. The vertical distance from the inlet / outlet rope of pulley 2 to the measuring point on the cutter ruler 4 is measured. The inlet / outlet rope angle of steel wire 3 is calculated by conversion. Specifically, the distance from the measuring point to pulley 2 is h, and the vertical distance from the inlet / outlet rope of pulley 2 to the measuring point is a. Then the inlet / outlet rope angle of steel wire 3 is Arctan(a / h). To reduce the error, another measuring point can be selected. The vertical distance from the inlet / outlet rope of pulley 2 to the second measuring point is b. The angle is calculated again using the same method. Theoretically, the angles calculated twice should be consistent.

[0030] Step five, after the measurement is finished, the positioning tool 5 is removed, the position of the pulley 2 is adjusted through the support head bolt 22, the angle of the in-out rope of each pulley 2 is adjusted to meet the requirements, that is, the angle of the in-out rope of each pulley 2 is controlled within 2 degrees, and the pulley 2 shell 21 is welded and fixed with the structure of the lifting platform system.

[0031] The embodiment is only a further explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make non-creative modifications to the embodiment according to the needs after reading the specification, and as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for positioning pulleys in a lifting platform system, characterized in that, The method includes the following steps: Step 1: Use C-type calipers to temporarily fix each pulley to the structure of the lifting platform system, and temporarily fix support bolts around the outer shell of each pulley; Step 2: Tie the steel wire to the hydraulic cylinder end of the lifting platform system, and then pass the steel wire around each pulley in turn and pull it to the lifting locking device of the lifting platform system. Step 3: Install positioning fixtures at the inlet and outlet rope grooves of each pulley. The positioning fixtures are detachably connected to the pulleys. Each positioning fixture includes two limiting blocks, which are respectively locked in the inlet and outlet rope grooves of the pulleys. One side of each limiting block is matched with the groove of the pulley, and the other side of each limiting block is provided with a semi-circular groove located on the center line of the limiting block. The steel wire passes through the semi-circular grooves on the two limiting blocks. Step 4: Detect the inlet and outlet rope angles of each pulley using a ruler and positioning fixture. This includes the following steps: Place a ruler on one side of the pulley, select a measurement point on the ruler, the distance from the measurement point to the pulley is h, and the vertical distance from the inlet and outlet ropes of the pulley to the measurement point is a. Then, the inlet and outlet rope angles of the steel wire are Arctan(a / h). Step 5: After measurement, remove the positioning fixture, adjust the position of the pulleys using the support bolts to ensure that the rope inlet and outlet angles of each pulley meet the requirements, and fix the pulley housings to the structure of the lifting platform system.

2. The method for positioning pulleys in a lifting platform system according to claim 1, characterized in that, The depth of the semicircular groove is 10-15mm.

3. The method for positioning pulleys in a lifting platform system according to claim 1, characterized in that, The positioning fixture is made of nylon.

4. The method for positioning pulleys in a lifting platform system according to claim 1, characterized in that, The measuring point is set at a distance of 300-500mm from the pulley.

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