A hoisting fixture for assembling and lifting rail transit gearboxes

Abstract

This utility model belongs to the technical field of gearbox maintenance equipment and discloses a hoisting fixture for assembling rail transit gearboxes. The specific technical solution is as follows: it includes a central shaft passing through the axle, with both the first and second ends of the central shaft extending outside the axle. A first base is provided in the middle of a first flange. The first end of the central shaft is threadedly connected to the first central shaft hole of the first flange. The threaded rod of the first lifting lug is threadedly connected to the first central shaft hole on the first base. A second base is provided in the middle of a second flange. The second end of the central shaft is threadedly connected to the second central shaft hole of the second flange. A nylon gasket is press-fitted between the second flange and the central shaft. A nylon sleeve is wrapped around the central shaft and placed inside the shaft hole of the axle. This utility model can achieve vertical hoisting and horizontal hoisting without damaging the axle structure and without requiring site modification. It can simultaneously meet the hoisting requirements of bearing clearance measurement, large gear hot fitting, and other processes that require axle hoisting.

Description

Technical Field

[0001] This utility model belongs to the technical field of gearbox maintenance equipment, specifically relating to a hoisting fixture for assembling and lifting rail transit gearboxes. Background Technology

[0002] During gearbox assembly, the assembly of the large gear with the axle and the measurement of the output bearing clearance both require the use of threaded holes on the shaft end and tooling for hoisting. Existing assembly and hoisting methods involve connecting a flange to the threaded hole on the shaft end with three or four bolts, vertically hoisting the axle. A crane and crane scale are then used to apply axial force to the axle for bearing clearance measurement. Alternatively, the axle can be directly hoisted vertically or horizontally for large gear hot-fitting and other assembly processes. Because the threaded hole on the shaft end is the customer's connection size, it is repeatedly used for connection during assembly and is subjected to significant stress, posing a risk of damaging the threaded hole.

[0003] The patent document CN202223120280.9 discloses a method for measuring bearing clearance without using threaded holes. This method employs a measuring table, with a support component installed at the bottom of the inner wall of the measuring table to support the axle gearbox assembly and apply an upward axial force. A manually operated hydraulic pump drives a hydraulic cylinder to provide the axial force required for bearing clearance measurement, thereby achieving precise quantitative output of the axial force. However, this method has high requirements for the site, requiring site modification, and cannot conveniently, quickly, and accurately measure bearing clearance. Utility Model Content

[0004] To address the technical problem of potential damage to axles during existing axle maintenance processes, this utility model provides a rail transit gearbox assembly and hoisting fixture that does not use a connection to the threaded hole at the axle end, making it convenient, quick, and efficient for maintenance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rail transit gearbox assembly and hoisting fixture, including a central shaft passing through the axle, the first end and the second end of the central shaft extending outside the axle, the first end of the central shaft being provided with an external thread, and the second end of the central shaft being provided with an external thread.

[0006] This tooling also includes a first flange, a first base in the middle of the first flange, a first central shaft hole through the first base in the center of the first flange, a first end of the central shaft threaded to the first central shaft hole of the first flange, and a threaded rod of the first lifting lug threaded to the first central shaft hole on the first base.

[0007] This fixture also includes a second flange, a second base in the middle of the second flange, a second central shaft hole through the second base in the center of the second flange, the second end of the central shaft being threaded into the second central shaft hole of the second flange, a nylon gasket being press-fitted between the second flange and the axle, and the nylon gasket being fixed to the second flange by multiple countersunk screws.

[0008] The central shaft is covered with a nylon sleeve, which is placed inside the shaft hole of the axle and serves a protective function.

[0009] This fixture also includes a second lifting lug. The threaded rod of the second lifting lug is threadedly connected to the second central shaft hole on the second base. The first and second lifting lugs are lifted by the lifting chains on both sides respectively, so as to achieve the horizontal lifting of the axle.

[0010] Preferably, the gap between the outer diameter of the nylon sleeve and the inner diameter of the axle hole is 0.1-0.2 mm.

[0011] Preferably, the diameters of the first flange and the second flange are both slightly smaller than the diameter of the axle.

[0012] Compared with the prior art, the specific advantages of this utility model are as follows: This utility model can be vertically or horizontally hoisted by inserting a central shaft through the shaft hole of the axle, which eliminates the traditional threaded hole connection on the end face of the axle, does not damage the axle structure, and does not require site modification. It is convenient and quick to use, and can simultaneously meet the needs of processes that require axle hoisting, such as bearing clearance measurement and large gear hot mounting, which facilitates gearbox maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0015] Figure 3 This is a schematic diagram of the structure of Example 2.

[0016] Figure 4 This is a schematic diagram of the protective sleeve.

[0017] In the diagram, 1 is the axle, 11 is the first end, 12 is the second end, 2 is the first flange, 21 is the first base, 22 is the first lifting lug, 3 is the second flange, 31 is the second base, 32 is the nylon gasket, 33 is the second lifting lug, 4 is the central shaft, 41 is the nylon sleeve, and 5 is the protective sleeve. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0019] like Figure 1-3 As shown, a hoisting fixture for assembling a rail transit gearbox includes a central shaft 4 passing through an axle 1. The first end 11 and the second end 12 of the central shaft 4 both extend outside the axle 1. The first end 11 of the central shaft 4 is provided with an external thread, and the second end 12 of the central shaft 4 is provided with an external thread.

[0020] This tooling also includes a first flange 2, a first base 21 is provided in the middle of the first flange 2, the first flange 2 and the first base 21 are arranged concentrically, the center of the first flange 2 is provided with a first central shaft hole that passes through the first base 21, the first end 11 of the central shaft 4 is threadedly connected to the first central shaft hole of the first flange 2, and the threaded rod of the first lifting lug 22 is threadedly connected to the first central shaft hole on the first base 21, that is, the central shaft 4, the first flange 2, the first base 21 and the first lifting lug 22 are connected together.

[0021] This tooling also includes a second flange 3, and a second base 31 is provided in the middle of the second flange 3. The second base 31 and the second flange 3 are arranged concentrically. A second central shaft hole is opened in the center of the second flange 3, which passes through the second base 31. The second end 12 of the central shaft 4 is threadedly connected to the second central shaft hole of the second flange 3, that is, the central shaft 4, the second flange 3 and the second base 31 are connected together.

[0022] A nylon gasket 32 ​​is press-fitted between the second flange 3 and the central shaft 4. The nylon gasket 32 ​​is fixed to the second flange 3 by multiple countersunk screws. The nylon gasket 32 ​​can ensure soft contact between the second flange 3 and the axle 1, avoiding damage to the axle 1.

[0023] The diameters of the first flange 2 and the second flange 3 are both slightly smaller than the diameter of the axle 1, making installation more stable and preventing the first flange 2 and the second flange 3 from curling.

[0024] A nylon sleeve 41 is wrapped around the central shaft 4 and is placed inside the shaft hole of the axle 1. Preferably, the gap between the outer diameter of the nylon sleeve 41 and the inner diameter of the shaft hole of the axle 1 is 0.1-0.2 mm.

[0025] The nylon sleeve 41 serves a protective function, preventing damage to the shaft hole of the axle 1.

[0026] This fixture can also be equipped with a protective sleeve 5. The protective sleeve 5 is fitted onto the front end of the central shaft 4, and the front end of the central shaft 4 is inserted into the shaft hole of the axle 1. The central shaft 4 is then pushed forward along the shaft hole of the axle 1 until the front end of the central shaft 4 passes through the axle 1. During routine storage and insertion of the central shaft 4 into the axle 1, to prevent rusting from exposure or damage to the shaft hole of the axle 1 by the front thread during insertion, the protective sleeve 5 serves as a guide design, ensuring smooth insertion of the central shaft 4 and facilitating protection during daily storage and use.

[0027] During the hoisting process, the entire axle 1 is vertically lifted by connecting it to the first lifting lug 22 via a lifting chain. Example

[0028] like Figure 4 As shown, the difference between this utility model and Embodiment 1 lies in the connection method of the second base 31. The threaded rod of the second lifting lug 33 is threadedly connected to the second central shaft hole on the second base 31. During the hoisting process, the lifting chain on one side is connected to the first lifting lug 22, and the lifting chain on the other side is connected to the second lifting lug 33. The entire axle 1 is horizontally hoisted.

[0029] This utility model allows for vertical or horizontal hoisting by inserting a central shaft 4 into the shaft hole of the axle 1. It eliminates the need for traditional threaded hole connection on the end face of the axle 1, causes no damage to the structure of the axle 1, and requires no site modification. It is convenient and quick to use and can simultaneously meet the needs of processes that require hoisting the axle 1, such as bearing clearance measurement and large gear hot mounting, thus facilitating gearbox maintenance.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the scope of the present utility model.

Claims

1. A hoisting fixture for assembling and lifting gearboxes in rail transit, characterized in that, Includes a central shaft (4) passing through the axle (1), the first end (11) and the second end (12) of the central shaft (4) both extending outside the axle (1), the first end (11) of the central shaft (4) is provided with an external thread, and the second end (12) of the central shaft (4) is provided with an external thread; It also includes a first flange (2), on which a first base (21) is provided, and on which a first central shaft hole is provided through the first base (21), the first end (11) of the central shaft (4) is threadedly connected to the first central shaft hole of the first flange (2), and the threaded rod of the first lifting lug (22) is threadedly connected to the first central shaft hole on the first base (21). It also includes a second flange (3), on which a second base (31) is provided, and a second central shaft hole through the second base (31) is provided on the second flange (3). The second end (12) of the central shaft (4) is threadedly connected to the second central shaft hole of the second flange (3). A nylon gasket (32) is press-fitted between the second flange (3) and the axle (1). The central shaft (4) is covered with a nylon sleeve (41), which is placed inside the shaft hole of the axle (1).

2. The rail transit gearbox assembly and hoisting fixture according to claim 1, characterized in that, It also includes a second lifting lug (33), the threaded rod of which is threadedly connected to the second central shaft hole on the second base (31).

3. The rail transit gearbox assembly and hoisting fixture according to claim 2, characterized in that, The gap between the outer diameter of the nylon sleeve (41) and the inner diameter of the shaft hole of the axle (1) is 0.1-0.2 mm.

4. The rail transit gearbox assembly and hoisting fixture according to claim 3, characterized in that, The diameters of the first flange (2) and the second flange (3) are both smaller than the diameter of the axle (1).

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