Installation Method and Adjustment Requirements for the Fixed Standard Lower Die of the Coaxial Guide Rail

What are the installation methods and adjustment requirements for the fixed standard lower die of a synchronous guide rail? Let’s discuss this next.

1. Each guide rail shall be provided with at least two guide rail supports, spaced 2 to 2.5 meters apart. In special cases, measures shall be taken to ensure that the installation of the guide rails complies with the bending strength requirements specified in GB 7588-2003. The levelness of the guide rail supports shall not exceed 1.5%, and the anchor bolts of the supports or the direct embedment depth of the supports shall be no less than 120 mm. If welded supports are used, the welds must be continuous and securely welded on both sides.

2. When reaching the top, the guide shoe shall not overtravel the rail.

3. For the working surfaces of guide rails in each row, the deviation at every 5 meters shall not exceed the following values: 0.6 mm for safety-equipped counterweight guide rails within the elevator car, and 1.0 mm for T-shaped counterweight guide rails without safety devices.

4. The guide rails shall be secured to the guide rail frame by clamping plates; welding or direct connection is prohibited.

5. Deviation in the top-surface distance between the two sets of guide rails: +2 to 0 for the car guide rails; +3 to 0 for the counterweight guide rails.

6. During the installation of the reference line, each row of guide rails shall be tested as a whole relative to the reference line, and the largest deviation value shall be recorded.

Adjust the guide rail

① Remove the installation line from the guide rail bracket, align the centerline of the car guide rail with the car guide rail centerline marked on the template, and secure it in place.

② Use a steel feeler gauge to measure the distance between the guide rail end face and the centerline of the car guide rail. Adjust the distance between the guide rail bracket and the guide rail by adding or removing shims, ensuring that the distance between the guide rail end face and the car guide rail centerline is consistent at all measurement points.

The guide rails provide guidance for the elevator car and counterweight during operation and also serve as a supporting structure during emergency brake activation. They are a critical component of the system.

The importance of the guide rail is analyzed from the perspectives of safety and comfort.

1. Safety. The material of the guide rails is a primary factor affecting safety. If the guide rail material is excessively hard or non-uniform (with localized areas that are too hard), the brake shoes will not generate sufficient friction when the brake is applied, which can lead to brake failure and, in the most severe scenarios, cabin fall. Furthermore, the guide rails must possess adequate strength to ensure they can reliably support the cabin and withstand the impact forces during braking.

2. Comfort. Factors that affect comfort include:

a. Guide rail connection accuracy: For solid guide rails, connection accuracy is ensured by the end dimensions of the rail and the symmetry of the male and female tenons. For hollow guide rails and escalator guide rails, connection accuracy is ensured by the end dimensions and geometric tolerances of the rail. The connection accuracy of the guide rails directly affects the stability and ride comfort during operation.

b. Guide rail surface roughness: The surface roughness of the guide rails directly affects the smooth operation of the guide shoes on the rail surface and also influences the retention of lubricating oil, thereby impacting the ride quality of the elevator car.

c. Straightness and deformation of the guide rails: Any bending or deformation at any point along the guide rails will generate lateral forces on the elevator car, disrupting its vertical linear motion and causing vibration. As the speed increases, these vibrations become more pronounced, thereby compromising ride comfort.