Large eccentric shaft mounting method

Abstract

The application discloses a large eccentric shaft mounting method, aiming at different stages of the eccentric shaft in the mounting process of a press, different arc-shaped backing plates are placed and different hoisting point positions are arranged, so that the mounting process is smoother and more stable, and meanwhile, the center of gravity is prevented from being deviated in the hoisting process of the eccentric shaft to cause serious mechanical damage. By using the mounting method, the eccentric shaft and the bushing will not cause damage to the bushing hole of the press in the mounting process, and the eccentric shaft is automatically aligned and located at the center position of the bushing hole, so that the mounting efficiency is improved, and the mounting quality is obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of eccentric shaft installation technology, specifically relating to a method for installing a large eccentric shaft. Background Technology

[0002] The eccentric shaft used on the press is installed in the through hole of the sliding bushing at the upper end of the press. Due to the long length of the eccentric shaft and the large eccentricity, the following problems exist during on-site installation:

[0003] 1) When lifting the eccentric shaft horizontally, due to the deep mounting hole, the lifting position must be changed multiple times during the crane lifting process. When changing the lifting position, it is inevitable that the eccentric shaft will collide with the bushing hole of the press, resulting in damage to both products.

[0004] 2) When installing the sliding bushing attached to the eccentric shaft, it is difficult to adjust the eccentric shaft to be in the middle of the bushing through hole, making the installation of the sliding bushing difficult and causing the bushing to jam with the eccentric shaft or the bushing hole.

[0005] 3) In order to improve installation efficiency, the damaged parts caused by installation are polished manually. This not only results in poor polishing accuracy, but also seriously affects the performance and life of the eccentric shaft. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for installing large eccentric shafts that meets the needs of different press models.

[0007] To achieve the above objectives, the present invention provides a method for installing a large eccentric shaft as follows:

[0008] 1) Place the upper part of the press horizontally;

[0009] 2) Tie a rope to each side of the eccentric section near the eccentric shaft and lift the eccentric shaft horizontally using the ropes; use a crane to slowly push the left end of the eccentric shaft into the right bushing hole. After the left end of the eccentric shaft has completely passed through the right bushing hole, place the first arc-shaped pad between the eccentric shaft and the right end of the right bushing hole.

[0010] 3) The crane lowers so that the first arc-shaped pad supports the eccentric shaft. Adjust the position of the suspension rope on the left side of the eccentric section so that the suspension rope on the left side is close to the left end of the eccentric shaft. The crane lifts the eccentric shaft and removes the first arc-shaped pad. The eccentric shaft descends so that the eccentric section of the eccentric shaft enters the right bushing hole. When the left end of the eccentric shaft enters the left bushing hole, place the second arc-shaped pad between the left end of the eccentric shaft and the right end of the left bushing hole.

[0011] 4) As the crane lowers, the second arc-shaped pad supports the eccentric shaft. Adjust the position of the left-side lifting rope so that it is close to the left side of the eccentric section of the eccentric shaft. After the crane lifts the eccentric shaft, remove the second arc-shaped pad and continue moving to the left. When the eccentric section is in the middle of the upper part of the press, raise the eccentric shaft. Place the first arc-shaped pad between the right end of the eccentric shaft and the left end of the left bushing hole, and between the eccentric shaft and the left end of the right bushing hole. Lower the eccentric shaft and remove the lifting rope.

[0012] Furthermore, the installation method also includes: inserting two lead screws into the through hole of the right bushing and the corresponding screw hole of the right bushing hole respectively, then tightening the nut at the end of the lead screw, and relying on the pressure generated by the screw of the nut to slowly press the right bushing into the right bushing hole. As the right bushing moves, the first arc-shaped pad is automatically squeezed out of the right bushing hole. The installation of the left bushing is the same as the installation process of the right bushing.

[0013] Furthermore, in step 1), the center line of the right bushing hole on the upper part of the press is collinear with the center line of the left bushing hole and parallel to the horizontal plane.

[0014] Furthermore, in step 2), after the left end of the eccentric shaft has completely passed through the right bushing hole, the suspension rope on the left side of the eccentric section is located on the right side of the right bushing hole.

[0015] Furthermore, in step 3), when the left end of the eccentric shaft enters the left bushing hole, the suspension rope at the left end of the eccentric shaft is located on the right side of the left bushing hole.

[0016] Furthermore, the upper arc surface of the first arc-shaped pad is consistent with the outer surface of the eccentric shaft, and the lower arc surface of the first arc-shaped pad is consistent with the inner surfaces of the left bushing hole and the right bushing hole.

[0017] Furthermore, the upper arc surface of the first arc-shaped pad is provided with an upper wear-resistant plate of wear-resistant flexible material and the lower arc surface of the first arc-shaped pad is provided with a lower wear-resistant plate.

[0018] Further, measure the distance from the right bushing end face to the upper right end face of the press until the deviation is no greater than 1mm.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the installation method of the present invention will not damage the press bushing hole during the installation process, and because the eccentric shaft is automatically aligned and located in the center of the bushing hole, it not only improves the installation efficiency but also improves the installation quality; the method requires fewer auxiliary tools, is easy to manufacture, has high installation efficiency, reduces on-site installation difficulty and damage risk, and can quickly complete the installation of the eccentric shaft and auxiliary bushing. The method can be extended to the installation of different presses, various eccentric shafts and accessories. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the upper part of the press of the present invention;

[0021] Figure 2 This is a schematic diagram of the eccentric shaft of the present invention;

[0022] Figure 3 ( Figure 3 a), 3b), 3c), and 3d) are schematic diagrams of the installation process;

[0023] Figure 4 This is a schematic diagram of the bushing installation process;

[0024] Figure 5 This is a diagram showing the installation complete.

[0025] Figure 6 for Figure 3 Schematic diagram of the first arc-shaped pad structure. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments to facilitate a clearer understanding of the present invention, but these embodiments do not constitute a limitation on the present invention.

[0027] The specific installation method for large eccentric shafts is as follows:

[0028] 1) Position the upper part 2 of the press horizontally, so that the center line of the right bushing hole 2-1 of the upper part 2 of the press is collinear with the center line of the left bushing hole 2-2 and parallel to the horizontal plane, such as... Figure 1 As shown;

[0029] 2) such as Figure 2 As shown, a lifting rope is attached to each of the left and right sides of the eccentric section 1-1 near the eccentric shaft 1, and the eccentric shaft 1 is horizontally lifted by the lifting ropes; as shown Figure 3 As shown in a and 3b, the left end of the eccentric shaft 1 is slowly pushed into the right bushing hole 2-1 by a crane. After the left end of the eccentric shaft 1 has completely passed through the right bushing hole 2-1, the first arc-shaped pad 7 is placed between the eccentric shaft 1 and the right end of the right bushing hole 2-1. At this time, the lifting rope on the left side of the eccentric section 1-1 is located on the right side of the right bushing hole 2-1, which makes it easy to remove the lifting rope.

[0030] 3) such as Figure 3 As shown in c, the crane descends, causing the first arc-shaped pad 7 to support the eccentric shaft 1. The position of the suspension rope on the left side of the eccentric section 1-1 is adjusted so that the suspension rope on the left side is close to the left end of the eccentric shaft. The crane lifts the eccentric shaft 1, removes the first arc-shaped pad 7, and the eccentric shaft 1 descends, causing the eccentric section 1-1 of the eccentric shaft to slowly enter the right bushing hole 2-1. When the left end of the eccentric shaft 1 enters the left bushing hole 2-2, the second arc-shaped pad 8 is placed between the left end of the eccentric shaft 1 and the right end of the left bushing hole 2-2. At this time, the suspension rope at the left end of the eccentric shaft is located on the right side of the left bushing hole 2-2, making it convenient to remove the suspension rope.

[0031] 4) such as Figure 3 As shown in d, the crane descends to support the eccentric shaft 1 with the second arc-shaped pad 8. The position of the left-side lifting rope is adjusted so that it is close to the left side of the eccentric section 1-1 of the eccentric shaft 1. After the crane lifts the eccentric shaft 1, the second arc-shaped pad 8 is removed and the crane continues to move slowly to the left. When the eccentric section 1-1 is in the middle of the upper part 2 of the press, the eccentric shaft 1 is raised. The first arc-shaped pad 7 is placed between the right end of the eccentric shaft 1 and the left end of the left bushing hole 2-2, and between the eccentric shaft 1 and the left end of the right bushing hole 2-1. The eccentric shaft 1 descends, the lifting rope is removed, and the eccentric shaft 1 is supported entirely by the two first arc-shaped pads 7.

[0032] like Figure 6 The upper arc surface of the first arc-shaped pad 7 is consistent with the outer surface of the eccentric shaft 1. Similarly, the lower arc surface of the first arc-shaped pad 7 is consistent with the inner surfaces of the left bushing hole 2-2 and the right bushing hole 2-1, ensuring that the eccentric shaft 1 automatically aligns and is positioned without skewing, and is centered in the bushing hole. This facilitates the subsequent installation of the left and right bushings and avoids mechanical damage to the eccentric shaft and bushing holes during bushing installation. Furthermore, the upper arc surface of the first arc-shaped pad 7 is provided with an upper wear-resistant plate 7-2 made of wear-resistant flexible material, and the lower arc surface of the first arc-shaped pad 7 is provided with a lower wear-resistant plate 7-1, eliminating damage to the contact surface caused by the first arc-shaped pad 7. The structure of the second arc-shaped pad 8 is the same as that of the first arc-shaped pad 7, but the dimensions of the second arc-shaped pad 8 are smaller than those of the first arc-shaped pad 7.

[0033] 5) such as Figure 4 As shown, the right bushing 3 is hoisted to the side of the right bushing hole 2-1. Since the right bushing 3 requires a relatively high angle during installation, two lead screws 5 are inserted into the through hole of the right bushing 3 and the corresponding screw hole of the right bushing hole 2-1, respectively, to fix the relative position of the right bushing 3. Then, the nut 6 is tightened at the end of the lead screw 5, and the pressure generated by the screw nut 6 slowly presses the right bushing 3 into the right bushing hole 2-1. As the right bushing 3 moves, the first arc-shaped pad 7 is automatically expelled from the right bushing hole 2-1. The distance from the end face of the right bushing 3 to the right end face of the upper part 2 of the press is measured until the deviation is no greater than 1mm. The installation of the left bushing 4 is the same as the installation of the right bushing 3. After installation, as shown... Figure 5 As shown.

[0034] This invention addresses the different stages of eccentric shaft installation on presses by placing different arc-shaped pads and setting different lifting points, making the installation process smoother and more stable. It also avoids serious mechanical damage caused by improper installation, such as eccentric shaft misalignment during lifting. Using this method, the eccentric shaft and bushing will not damage the press bushing hole during installation. Furthermore, because the eccentric shaft automatically aligns itself at the center of the bushing hole, it not only improves installation efficiency but also significantly enhances installation quality. This method requires fewer auxiliary tooling, is easy to manufacture, and has high installation efficiency, allowing for rapid installation of the eccentric shaft and auxiliary bushing. This method can be extended to the installation of different presses, various eccentric shafts, and accessories.

Claims

1. A method for installing a large eccentric shaft, characterized in that: The installation method is as follows: 1) Place the upper part (2) of the press horizontally; 2) Tie a rope to each side of the eccentric section (1-1) near the eccentric shaft (1) and lift the eccentric shaft (1) horizontally using the ropes; use a crane to slowly push the left end of the eccentric shaft (1) into the right bushing hole (2-1). After the left end of the eccentric shaft (1) has completely passed through the right bushing hole (2-1), place the first arc-shaped pad (7) between the eccentric shaft (1) and the right end of the right bushing hole (2-1); 3) The crane descends to support the eccentric shaft (1) with the first arc-shaped pad (7). The position of the suspension rope on the left side of the eccentric section (1-1) is adjusted so that the suspension rope on the left side is close to the left end of the eccentric shaft. The crane lifts the eccentric shaft (1), removes the first arc-shaped pad (7), and the eccentric shaft (1) descends so that the eccentric section (1-1) of the eccentric shaft enters the right bushing hole (2-1). When the left end of the eccentric shaft (1) enters the left bushing hole (2-2), the second arc-shaped pad (8) is placed between the left end of the eccentric shaft (1) and the right end of the left bushing hole (2-2). 4) The crane lowers so that the second arc-shaped pad (8) supports the eccentric shaft (1). Adjust the position of the left-side hoisting rope so that the left-side hoisting rope is close to the left side of the eccentric section (1-1) of the eccentric shaft (1). After the crane lifts the eccentric shaft (1), remove the second arc-shaped pad (8) and continue to move to the left. When the eccentric section (1-1) is in the middle of the upper part (2) of the press, raise the eccentric shaft (1). Place the first arc-shaped pad (7) between the right end of the eccentric shaft (1) and the left end of the left bushing hole (2-2) and between the eccentric shaft (1) and the left end of the right bushing hole (2-1). The eccentric shaft (1) falls and the hoisting rope is removed. The upper arc surface of the first arc-shaped pad (7) is consistent with the outer surface of the eccentric shaft (1), and the lower arc surface of the first arc-shaped pad (7) is consistent with the inner surface of the left bushing hole (2-2) and the right bushing hole (2-1).

2. The method for installing a large eccentric shaft according to claim 1, characterized in that: The installation method further includes: inserting two lead screws (5) into the through hole of the right bushing (3) and the corresponding screw hole of the right bushing hole (2-1) respectively, and then locking the nut (6) at the end of the lead screw (5). The right bushing (3) is slowly pressed into the right bushing hole (2-1) by the pressure generated by the screw (6). As the right bushing (3) moves, the first arc-shaped pad (7) is automatically squeezed out of the right bushing hole (2-1). The installation of the left bushing (4) is the same as the installation process of the right bushing (3).

3. The method for installing a large eccentric shaft according to claim 1, characterized in that: In step 1), the center line of the right bushing hole (2-1) of the upper part (2) of the press is collinear with the center line of the left bushing hole (2-2) and parallel to the horizontal plane.

4. The method for installing a large eccentric shaft according to claim 1, characterized in that: In step 2), after the left end of the eccentric shaft (1) has completely passed through the right bushing hole (2-1), and at this time the suspension rope on the left side of the eccentric section (1-1) is located on the right side of the right bushing hole (2-1).

5. The method for installing a large eccentric shaft according to claim 1, characterized in that: In step 3), when the left end of the eccentric shaft (1) enters the left bushing hole (2-2), the suspension rope at the left end of the eccentric shaft is located on the right side of the left bushing hole (2-2).

6. The method for installing a large eccentric shaft according to claim 1, characterized in that: The upper arc surface of the first arc-shaped pad (7) is provided with an upper wear-resistant plate (7-2) of wear-resistant flexible material, and the lower arc surface of the first arc-shaped pad (7) is provided with a lower wear-resistant plate (7-1).

7. The method for installing a large eccentric shaft according to claim 2, characterized in that: Measure the distance from the end face of the right bushing (3) to the right end face of the upper part (2) of the press until the deviation is no more than 1mm.

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