An assembly tool for a stepped shaft

Abstract

This application relates to an assembly fixture for step shafts, belonging to the technical field of escalator assembly. It includes a base plate, radial positioning seats, and axial positioning seats. Multiple radial positioning seats are spaced apart along the length of the base plate, and the step shaft is placed on these radial positioning seats along its length. Two axial positioning seats are located at opposite ends of the step shaft along its length and are fixedly mounted on the base plate. During assembly, the operator places the step shaft on the radial positioning seats, achieving radial restraint. At this time, both ends of the step shaft along its length abut against the two axial positioning seats. The axial positioning seats are equipped with locking elements to lock the step shaft and prevent rotation. This application, through the synergistic effect of the radial and axial positioning seats, forms a stable constraint on the step shaft radially and axially, preventing the step shaft from shifting or moving due to external forces or vibrations during assembly.

Description

Technical Field

[0001] This application relates to the technical field of escalator assembly, and in particular to an assembly tooling for step shafts. Background Technology

[0002] As a vital transportation device for carrying people, escalators rely heavily on their steps, which are the key components directly supporting passengers. These steps operate continuously via the step shaft and step chain. The assembly precision of the step shaft directly affects the smoothness and safety of the escalator's operation. Improper assembly can lead to step swaying or even sudden malfunctions. Therefore, extremely high requirements are placed on the assembly process of the step shaft and its connecting components. In existing technologies, the step shaft must simultaneously achieve a reliable connection with both the steps and the step chain; its assembly quality becomes crucial for ensuring the long-term stable operation of the escalator.

[0003] Ladder clips 01 are fitted on the outer circumference of both ends of the ladder shaft 00. These clips are used to fix the ladder steps. Simultaneously, the ladder shaft 00 is connected to the ladder chain via pins, forming a rotatable connection structure. Specifically, the ladder clips 01 fix the ladder shaft 00 to the ladder steps. This assembly method requires the ladder clips 01 to maintain precise axial and circumferential positioning on the ladder shaft 00 to ensure the synchronization and stability of the ladder steps as they run with the chain. However, in existing technology, the ladder clips are locked to the ladder shaft 00 using bolt assemblies, requiring repeated bolt adjustments during assembly, which is inefficient and prone to loosening.

[0004] Regarding the aforementioned technologies, since the step clips are tightly secured to the step shaft, they are prone to loosening during the assembly process. This can cause the step clips to move axially along the step shaft, affecting the assembly of both the step shaft and the steps. Furthermore, assembly requires repeated bolt adjustments, making the process cumbersome and inefficient. Therefore, there is an urgent need to design a tooling that can achieve a stable connection between the step clips and the step shaft, prevent loosening, and facilitate assembly. Utility Model Content

[0005] In view of the shortcomings of the existing technology, one of the objectives of this utility model is to provide an assembly fixture for a ladder shaft.

[0006] This application provides an assembly fixture for a stepped shaft, which adopts the following technical solution: An assembly fixture for a step shaft includes a base plate, a radial positioning seat, an axial positioning seat, and an abutment block. There are two axial positioning seats, which are located at both ends of the step shaft along its length and are fixedly mounted on the base plate. The radial positioning seat is located between the two axial positioning seats and is fixedly mounted on the base plate. The step shaft is placed on the radial positioning seat, and a step buckle is fitted on the outer periphery of the step shaft. An abutment block for abutting the step buckle is provided on the radial positioning seat.

[0007] By adopting the above technical solution, the axial positioning seat limits the axial position from both ends of the step shaft, preventing the step shaft from moving along its length. The radial positioning seat provides stable support for the step shaft, and the abutment block on it can directly abut against the step buckle, forming an axial constraint on the step buckle. This effectively prevents the step buckle from loosening or moving during assembly, eliminating the need for repeated bolt adjustments, simplifying the operation process, and laying the foundation for the precise assembly of the step shaft and the step.

[0008] Preferably, there are at least two radial positioning seats, which are spaced apart along the length of the base plate.

[0009] By adopting the above technical solution, multiple spaced radial positioning seats can provide support from different positions of the ladder shaft, forming a multi-point stable support structure. This avoids problems such as sagging or offset in the middle of the ladder shaft due to its long length or external assembly forces, further improving the radial stability of the ladder shaft during the assembly process. It ensures that the ladder shaft is always on the preset assembly reference plane, guaranteeing the coaxiality and accuracy of subsequent component assembly.

[0010] Preferably, the abutment block is provided with an adjusting bolt, and the radial positioning seat is provided with an arc-shaped waist-shaped hole for moving the adjusting bolt.

[0011] By adopting the above technical solution, the adjustment bolt and the arc-shaped waist-shaped hole provide an arc-shaped adjustment trajectory for the abutment block. The operator can loosen the adjustment bolt and move the abutment block along the arc-shaped waist-shaped hole according to the actual installation angle and position deviation of the ladder buckle until the abutment block and the ladder buckle are precisely fitted. There is no need to disassemble and reinstall the abutment block, which greatly improves the adaptability and meets the precise constraint requirements of different specifications of ladder buckles or assembly deviations.

[0012] Preferably, the abutting block is provided with a limiting surface for abutting the step buckle, and the limiting surface is adapted to the abutting surface of the step buckle.

[0013] By adopting the above technical solution, the matching limiting surface and the step buckle contact surface can achieve a large-area tight fit, which not only restricts the step buckle movement axially, but also constrains the step buckle rotation circumferentially, forming a bidirectional stable constraint. This avoids problems such as uneven local force and loosening of the step buckle due to poor contact surface fit, further strengthening the relative fixed relationship between the step buckle and the step shaft, and ensuring the stability of the step operation after assembly.

[0014] Preferably, the radial positioning seat has a limiting groove for limiting the radial displacement of the step shaft.

[0015] By adopting the above technical solution, the limiting groove can form a wrapping constraint on the step shaft from the radial direction, clarify the placement reference of the step shaft, and avoid the step shaft from shifting left and right or shaking up and down due to external force or vibration during the assembly process. This ensures that the step shaft is always in the preset radial position, providing a precise radial reference for subsequent processes such as axial positioning and step buckle installation, and reducing assembly errors caused by radial offset.

[0016] Preferably, the limiting groove is an elongated groove with a U-shaped cross-section.

[0017] By adopting the above technical solution, the long strip-shaped limiting groove with U-shaped cross section can fit and conform to the outer periphery of the step shaft. The bottom of the groove provides stable support, and the two side walls restrict the horizontal displacement of the step shaft, forming a semi-enclosed support structure. This not only makes it easy for operators to quickly put the step shaft into the limiting groove, but also ensures the radial position stability of the step shaft during assembly. At the same time, it avoids sharp structures from scratching the surface of the step shaft, thus balancing ease of operation and workpiece protection.

[0018] Preferably, the axial positioning seat is provided with a locking element for locking the step shaft to prevent it from rotating. The locking element is a limiting pin. The two ends of the step shaft along the length direction are provided with pin holes. The axial positioning seat is provided with positioning holes. The limiting pin passes through the pin holes and the positioning holes.

[0019] By adopting the above technical solution, after the limiting pin passes through the pin hole and the positioning hole, a rigid locking structure can be formed: on the one hand, it further fixes the axial position of the step shaft, and avoids the step shaft from axial movement due to subsequent operations after the initial positioning; on the other hand, it restricts the rotation of the step shaft around its own axis, and prevents the rotation of the step shaft from causing the step buckle to shift circumferentially, ensuring that the step buckle is always in the position that matches the abutment block, providing a premise for the abutment block to accurately constrain the step buckle. At the same time, the pin-type locking operation is simple, the disassembly and assembly efficiency is high, and it does not affect the overall assembly process.

[0020] Preferably, two sliding shafts are provided between the two axial positioning seats, and at least two sliders are slidably mounted on the two sliding shafts. The sliders correspond one-to-one with the radial positioning seats, and the radial positioning seats are fixedly mounted on the sliding shafts. A threaded hole is provided on the side wall of the slider, and a locking bolt is threaded into the threaded hole. When the locking bolt is tightened, one end of the locking bolt abuts against the sliding shaft.

[0021] By adopting the above technical solution, the cooperation between the slider and the slide shaft enables the movable adjustment of the radial positioning seat. The operator can adjust the spacing and position of the radial positioning seat by sliding the slider according to the position of the step buckle and other accessories on the step shaft, avoiding interference from the accessories. After the locking bolt is tightened, the position of the slider is fixed by the clamping force with the slide shaft, ensuring that the radial positioning seat remains stable after adjustment.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The U-shaped limiting groove achieves radial positioning of the step shaft, the axial positioning seat and the limiting pin achieve axial and circumferential locking of the step shaft, and the abutment block and the step buckle fit together to achieve bidirectional constraint. Multiple components work together to form all-round positioning in radial, axial and circumferential directions, effectively avoiding step shaft offset and step buckle loosening, and significantly improving assembly accuracy. 2. The arc-shaped waist-shaped hole and the adjusting bolt are used to make fine adjustment of the angle of the abutment block, and the sliding shaft and the slider are used to make adjustment of the radial positioning seat position. Different specifications of step shafts and step buckles can be adapted without disassembly and reassembly, reducing repeated adjustment and disassembly steps, reducing operation complexity and improving assembly efficiency. 3. The radial positioning seat with multiple support points, the limit pin with rigid locking, and the tightly fitting abutment block form a stable assembly structure, reducing problems such as step shaking and malfunctions caused by loose or misaligned parts, ensuring the long-term stable operation of the escalator and reducing later maintenance costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram illustrating the overall structure of the radial positioning seat. Figure 3 This utility model is for demonstration purposes, showing the state structure of the ladder buckle and the abutment plate after the ladder shaft is installed on the radial positioning seat; Figure 4 This is a schematic diagram of the overall structure of the axial positioning seat.

[0024] Reference numerals: 00, step shaft; 01, step buckle; 1, base plate; 2, radial positioning seat; 21, limiting groove; 22, arc-shaped waist hole; 3, axial positioning seat; 31, positioning hole; 4, locking element; 41, limiting pin; 5, abutment block; 51, limiting surface; 6, fixing block; 7, sliding shaft; 8, slider; 9, locking bolt. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses an assembly fixture for a ladder shaft.

[0027] Reference Figure 1 and Figure 2An assembly fixture for a step shaft includes a base plate 1, radial positioning seats 2, and axial positioning seats 3. Multiple radial positioning seats 2 are spaced apart along the length of the base plate 1, and the step shaft 00 is placed on these radial positioning seats 2 along its length. Two axial positioning seats 3 are located at opposite ends of the step shaft 00 along its length and are fixedly mounted on the base plate 1. When assembling the step shaft 00, the operator places it on the radial positioning seats 2, achieving radial positioning of the step shaft 00. At this time, both ends of the step shaft 00 abut against the two axial positioning seats 3 along its length. The axial positioning seats 3 are equipped with locking elements 4 to lock the step shaft 00 and prevent its rotation.

[0028] The radial positioning seat 2 has a radial limiting groove 21, which is an elongated groove with a U-shaped cross-section. The U-shaped limiting groove 21 forms a semi-enclosed support structure. When the step shaft 00 is placed, its outer periphery can fit tightly with the two side walls and bottom of the limiting groove 21, simultaneously constraining the radial displacement of the step shaft 00 in both horizontal and vertical directions. This prevents the step shaft 00 from shifting left or right or wobbling up or down due to external forces or vibrations during assembly, ensuring that the step shaft 00 is always in the preset assembly reference position, providing a precise radial reference for subsequent steps such as the installation of the step buckle 01 and axial locking.

[0029] Specifically, two radial positioning seats 2 near the two ends of the step shaft 00 are respectively provided with abutment blocks 5. Each abutment block 5 has a limiting surface 51 for abutting the step latch 01, and the limiting surface 51 is adapted to the abutment surface of the step latch 01. The limiting surface 51 of the abutment block 5 and the abutment surface of the step latch 01 are adapted to achieve a tight fit, forming a stable constraint on the step latch 01 in both the circumferential and axial directions. This effectively solves the problem of the step latch 01 being prone to loosening and axial movement, ensuring that the step latch 01 is always in the preset assembly position. This provides a guarantee for the precise connection between the step shaft 00 and the step, and avoids affecting the subsequent assembly accuracy due to latch misalignment. Furthermore, two radial positioning seats 2 near the two ends of the step shaft 00 are respectively provided with arc-shaped waist-shaped holes 22. Bolts are inserted into the arc-shaped waist-shaped holes 22 and are threadedly connected to the abutment block 5. The arc-shaped waist-shaped holes 22 of the radial positioning seats 2 provide an arc-shaped movement trajectory for the bolts. The operator can adjust the position of the abutment block 5 along the arc-shaped waist-shaped holes 22 by loosening the bolts, so that the abutment block 5 can be precisely adapted according to the actual installation angle and position requirements of the step buckle 01.

[0030] When the step shaft 00 is placed on the positioning seat, the two ends of the step shaft 00 are initially positioned by the axial positioning seat 3 to fix the position of the step shaft 00 along its length and prevent axial movement. Then, the abutment blocks 5 close to the radial positioning seats 2 at both ends of the step shaft 00 are slid in, and the limiting surface 51 on the abutment block 5, which is adapted to the abutment surface of the step buckle 01, is used to tightly abut against the step buckle 01 fitted on the outer periphery of the step shaft 00.

[0031] Reference Figure 3 The abutment block 5 can be finely adjusted in position by engaging its own adjusting bolt with the arc-shaped waist-shaped hole 22 on the radial positioning seat 2, ensuring that the limiting surface 51 can accurately fit the abutment surface of the step buckle 01, thereby forming a stable circumferential and axial constraint on the step buckle 01. In this state, the step buckle 01 is firmly restricted in the preset assembly position and will not loosen or shift due to vibration, external force contact, or slight movement of the step shaft 00 during subsequent assembly operations.

[0032] Reference Figure 1 and Figure 4 The locking component 4 is a limiting pin 41. The two ends of the step shaft 00 along the length direction are provided with pin holes. The axial positioning seat 3 is provided with positioning holes 31. After the two ends of the step shaft 00 abut against the axial positioning seat 3 and the initial axial positioning is completed, the operator can insert the limiting pin 41 into the positioning holes 31 of the axial positioning seat 3 and the pin holes at both ends of the step shaft 00 in sequence. At this time, the limiting pin 41 forms a rigid constraint through the cooperation of the positioning hole 31 and the pin hole, further locking the axial position of the step shaft 00, preventing axial movement during subsequent assembly, and ensuring that the step shaft 00 always maintains a precise contact with the axial positioning seat 3; the limiting pin 41 can restrict the rotation of the step shaft 00 around its own axis, preventing the step shaft 00 from rotating due to external force or operational vibration, thereby preventing the circumferential position displacement of the step buckle 01 on the step shaft 00, providing a reliable premise for the precise fit of the abutment block 5 and the step buckle 01 and the stable fixation of the step buckle 01, and ultimately ensuring the overall assembly accuracy of the step shaft 00.

[0033] Specifically, two fixing blocks 6 are arranged between the two axial positioning seats 3, and two sliding shafts 7 are arranged between the two fixing blocks 6. The two sliding shafts 7 are in the same length direction as the step shaft 00 and are spaced apart. The two ends of the two sliding shafts 7 are fixedly connected to the two fixing blocks 6 respectively. Multiple sliders 8 are slidably installed on the two sliding shafts 7. The multiple sliders 8 correspond one-to-one with multiple radial positioning seats 2. The multiple radial positioning seats 2 are fixedly installed on the top surface of the multiple sliders 8. Threaded holes are opened on the side walls of the sliders 8, and locking bolts 9 are threaded into the threaded holes. When the locking bolts 9 are tightened, the end of the locking bolt 9 located in the threaded hole abuts against the sliding shaft 7. By sliding and adjusting the position of the radial positioning seats 2, the components (such as step clips 01) on the step shaft 00 can be precisely avoided. The slidable radial positioning seats 2 allow the operator to flexibly adjust the position of the support points according to the specific component (step clip 01) layout on the step shaft 00 being assembled, making the support more reasonable, avoiding interference, and improving positioning stability.

[0034] The implementation principle of this application embodiment is as follows: The operator first places the step shaft 00 into the U-shaped limiting groove 21 of a plurality of radial positioning seats 2 spaced apart along the length direction of the base plate 1. The limiting groove 21 forms a radial constraint on the step shaft 00, while the two ends of the step shaft 00 abut against the two axial positioning seats 3 to complete the initial axial positioning. Then, the limiting pin 41 is inserted into the positioning hole 31 of the axial positioning seat 3 and the pin hole of the step shaft 00 to lock the axial position of the step shaft 00 and prevent rotation. Then, according to the outer periphery of the step shaft 00 The position of the step buckle 01 is adjusted by sliding the slider 8 along the sliding shaft 7 to change the position of the radial positioning seat 2. After avoiding the assembly parts, tighten the locking bolt 9 on the slider 8 to fix the radial positioning seat 2. Then loosen the connecting bolt of the abutment block 5 and adjust the position of the abutment block 5 along the arc-shaped waist hole 22 of the radial positioning seat 2 so that the limiting surface 51 of the abutment block 5 is in close contact with the abutment surface of the step buckle 01. Finally, tighten the bolt to fix the abutment block 5, thereby completing the stable assembly of the step shaft 00 and the step buckle 01, ensuring the accuracy and efficiency of subsequent assembly.

[0035] 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. An assembly fixture for a stepped shaft, characterized in that, The device includes a base plate (1), a radial positioning seat (2), an axial positioning seat (3), and an abutment block (5). There are two axial positioning seats (3), which are located at both ends of the step shaft (00) along the length direction and are fixedly installed on the base plate (1). The radial positioning seat (2) is located between the two axial positioning seats (3) and is fixedly installed on the base plate (1). The step shaft (00) is placed on the radial positioning seat (2). A step buckle (01) is fitted on the outer periphery of the step shaft (00). An abutment block (5) for abutting the step buckle (01) is provided on the radial positioning seat (2).

2. The assembly fixture for a stepped shaft according to claim 1, characterized in that, There are at least two radial positioning seats (2), which are spaced apart along the length of the base plate (1).

3. The assembly fixture for a stepped shaft according to claim 2, characterized in that, The abutment block (5) is provided with an adjusting bolt, and the radial positioning seat (2) is provided with an arc-shaped waist-shaped hole (22) for moving the adjusting bolt.

4. The assembly fixture for a stepped shaft according to claim 3, characterized in that, The abutting block (5) is provided with a limiting surface (51) for abutting the step buckle (01), and the limiting surface (51) is adapted to the abutting surface of the step buckle (01).

5. The assembly fixture for a stepped shaft according to claim 3, characterized in that, The radial positioning seat (2) has a limiting groove (21) for limiting the radial displacement of the step shaft (00).

6. The assembly fixture for a stepped shaft according to claim 5, characterized in that, The limiting groove (21) is a long strip groove with a U-shaped cross-section.

7. The assembly fixture for a stepped shaft according to claim 1, characterized in that, The axial positioning seat (3) is provided with a locking member (4) for locking the step shaft (00) to prevent it from rotating. The locking member (4) is a limiting pin (41). The step shaft (00) has pin holes at both ends along its length. The axial positioning seat (3) has a positioning hole (31). The limiting pin (41) passes through the pin hole and the positioning hole (31).

8. The assembly fixture for a stepped shaft according to claim 7, characterized in that, Two sliding shafts (7) are provided between the two axial positioning seats (3). At least two sliders (8) are slidably installed on the two sliding shafts (7). The sliders (8) correspond one-to-one with the radial positioning seats (2), and the radial positioning seats (2) are fixedly installed on the sliding shafts (7). A threaded hole is provided on the side wall of the slider (8). A locking bolt (9) is threaded into the threaded hole. When the locking bolt (9) is tightened, one end of the locking bolt (9) abuts against the sliding shaft (7).

Images