Rail transit gear box paint spraying hoisting tool

Abstract

This utility model belongs to the field of gearbox painting technology, specifically relating to a hoisting fixture for painting rail transit gearboxes. The specific technical solution includes a lifting lug, a first insert rod fixed to the outer side of the lug, and a chain loop with its bottom end annularly fitted onto the lug. A base is provided on one side of a flange, and the first insert rod is threaded into the base. A second insert rod is provided on the other side of the flange, with a nylon sleeve covering its outer surface. The second insert rod is inserted into the shaft hole on the corresponding side of the main shaft, with a clearance fit between the second insert rod and the corresponding shaft hole. This utility model, by arranging hoisting fixtures on both sides of the main shaft, allows the second insert rod to be inserted into the shaft hole of the axle during use. During the painting process, the axle can rotate as needed to achieve uniform painting of the axle's outer surface, improving work efficiency and ensuring the overall painting quality of the workpiece.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox painting technology, specifically relating to a hoisting fixture for painting rail transit gearboxes. Background Technology

[0002] In the painting process of rail transit gearboxes, the axle or gearbox with axle needs to be horizontally suspended on the painting line. As the painting line rotates, the axle or gearbox with axle passes through each painting process in sequence to complete the spraying of each layer of paint. The existing connection method is to use a flange connected to the threaded hole at the end of the axle with three or four bolts. The flange is connected to the lifting chain with bolts, and the axle is lifted by the lifting chain. The installation process of the fixture requires tightening 8-10 bolts on both sides, which is time-consuming and inefficient. Furthermore, when painting the axle, the axle has a regular cylindrical structure. Due to the suspension method of the axle, both ends of the axle are tightened with multiple bolts, and the axle cannot rotate relative to the lifting chain. The paint under the axle is prone to drips and uneven spraying, resulting in poor paint surface smoothness and difficulty in guaranteeing the painting quality. Utility Model Content

[0003] To address the technical problems existing in the prior art, this utility model provides a hoisting fixture for painting rail transit gearboxes. The entire fixture is installed using a quick-connect method, which improves the overall hoisting and painting efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a hoisting fixture for painting a rail transit gearbox, including a suspension fixture movably installed in the shaft holes on both sides of the main shaft, with the two suspension fixtures arranged symmetrically, and the two suspension fixtures lifting the main shaft.

[0005] The suspension fixture includes a lifting lug and an insertion fixture. The lifting lug has a ring-shaped structure, and a first insertion rod is fixed on the outside of the lifting lug. The first insertion rod has a straight rod structure and an external thread at the front end of the first insertion rod. The bottom end of the suspension chain is ring-shaped and fitted onto the lifting lug. The lifting lug can rotate relative to the suspension chain to achieve the rotation of the main shaft.

[0006] The insertion fixture includes a flange, a base on one side of the flange, the base and the flange are arranged concentrically, and a threaded hole is opened coaxially on the base. The first insertion rod is threaded into the threaded hole. A second insertion rod is provided on the other side of the flange. The second insertion rod is inserted into the shaft hole on the corresponding side of the spindle. The second insertion rod and the shaft hole on the corresponding side are clearance fitted.

[0007] The axis of the first insertion rod is arranged along the diameter of the lifting lug to ensure the stability of the main shaft rotation.

[0008] The second insertion rod is arranged coaxially with the threaded hole of the base, further ensuring the stability of the spindle rotation.

[0009] The outer surface of the second insert is covered with a nylon sleeve. The nylon sleeve has an annular outer edge with the same diameter as the flange. The annular outer edge is arranged close to the surface of the flange, that is, the nylon sleeve and the annular outer edge completely cover the surface in contact with the spindle, so as to avoid the tooling from damaging the surface in contact with the spindle.

[0010] The nylon sleeve has a guide end, which is a transition type. The diameter of the guide end is smaller than that of the nylon sleeve, making it easier for the second insert rod to enter the spindle hole.

[0011] Compared with the prior art, the specific beneficial effects of this utility model are as follows: By arranging lifting fixtures on both sides of the main shaft, the second insert rod is inserted into the shaft hole of the axle during use. During the painting process, the axle can be rotated as needed to achieve uniform painting on the outer surface of the axle, thereby improving work efficiency and ensuring the painting quality of the entire workpiece. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0014] Figure 3 for Figure 2 A magnified view of a section at point B in the middle.

[0015] In the diagram, 1 is the main shaft, 2 is the suspension fixture, 21 is the lifting lug, 22 is the first insert rod, 23 is the flange, 24 is the base, 25 is the second insert rod, 26 is the shaft hole, 27 is the nylon sleeve, 28 is the guide end, 29 is the annular outer edge, and 3 is the lifting chain. Detailed Implementation

[0016] 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.

[0017] like Figure 1-3 As shown, a hoisting fixture for painting a rail transit gearbox includes a suspension fixture 2 movably installed in the shaft holes 26 on both sides of the main shaft 1. The two suspension fixtures 2 are symmetrically arranged and the two suspension fixtures 2 lift the main shaft 1.

[0018] The suspension fixture 2 includes a lifting lug 21 and an insertion fixture. The lifting lug 21 has a ring-shaped structure. A first insertion rod 22 is fixed on the outside of the lifting lug 21. The first insertion rod 22 has a straight rod structure and an external thread at the front end. The bottom end of the suspension chain 3 is ring-shaped and fitted onto the lifting lug 21. The lifting lug 21 can rotate relative to the suspension chain 3 to realize the rotation of the main shaft 1.

[0019] The insertion fixture includes a flange 23, a base 24 on one side of the flange 23, the base 24 being concentrically arranged with the flange 23, and a threaded hole coaxially opened on the base 24. The first insertion rod 22 is threaded into the threaded hole. The other side of the flange 23 is provided with a second insertion rod 25, which is inserted into the shaft hole 26 on the corresponding side of the spindle 1. The second insertion rod 25 and the shaft hole 26 on the corresponding side are clearance fitted.

[0020] The axis of the first insertion rod 22 is arranged along the diameter direction of the lifting lug 21 to ensure the stability of the rotation of the main shaft 1.

[0021] The second insertion rod 25 is arranged coaxially with the threaded hole of the base 24, further ensuring the stability of the rotation of the spindle 1.

[0022] The outer surface of the second insert 25 is covered with a nylon sleeve 27. The nylon sleeve 27 and the shaft hole 26 of the axle are fitted with a clearance, with the clearance controlled at 0.1-0.2mm. The nylon sleeve 27 has an annular outer edge 29. The diameter of the annular outer edge 29 is the same as the diameter of the flange 23. The annular outer edge 29 is made of nylon and is arranged close to the surface of the flange 23. That is, the nylon sleeve 27 and the annular outer edge 29 completely cover the surface in contact with the main shaft 1, so as to avoid damage to the surface in contact with the main shaft 1 by the metal tooling.

[0023] The nylon sleeve 27 has a guide end 28 at its end. The guide end 28 is a transition type end, and its diameter is smaller than that of the nylon sleeve 27, which facilitates the second insertion rod 25 to enter the shaft hole 26 of the main shaft 1.

[0024] In actual operation, instead of using the connection method of threaded hole and bolt at the shaft end, a quick-insertion method is adopted. The second insert rod 25 is inserted into the shaft hole 26 on the corresponding side of the axle. The nylon sleeve 27 contacts the inner wall of the shaft hole 26 on the corresponding side of the axle, and the annular outer edge 29 fits against both sides of the axle. The painting process is started. The axle moves forward slowly with the hoisting fixture. When it reaches the designated painting process, the axle is painted. Due to the influence of the axle's own weight, the friction force directly generated between the nylon sleeve 27 and the axle is much greater than the friction force between the lifting lug 21 and the lifting chain 3. This allows the axle to rotate in the suspended state, which facilitates painting operations in all directions of the axle, ensures uniform paint surface, and guarantees painting quality.

[0025] During use, the hoisting fixture can be suspended on the painting line. When in use, lower the hoisting chain 3, insert the second insert rod 25 directly into the center hole of the axle, raise the hoisting chain 3 to carry out the painting work of the main shaft 1; after the painting is completed, lower the hoisting chain 3, take the second insert rod 25 out of the axle, and run the hoisting chain 3 in reverse to its original position for the next painting work.

[0026] During the operation of the paint spraying line, due to the slow overall speed of the paint spraying line, when the line stops, the axle swings back and forth slightly due to inertia. Since the length of the second insert rod 25 is much greater than the swing amplitude, the gearbox can be firmly restricted from shaking by the tooling on both sides.

[0027] This utility model can also be used to paint the gearbox with shaft. The painting process is similar to that of the main shaft 1, and will not be described in detail here.

[0028] 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 painting rail transit gearboxes, characterized in that, Includes suspension fixtures (2) that are movably installed in the shaft holes (26) on both sides of the main spindle (1), with the two suspension fixtures (2) arranged symmetrically; The suspension fixture (2) includes a lifting lug (21) and an insertion fixture. The lifting lug (21) is a ring-shaped structure. A first insertion rod (22) is fixed on the outside of the lifting lug (21). The bottom end of the suspension chain (3) is fitted onto the lifting lug (21). The insertion fixture includes a flange (23), a base (24) on one side of the flange (23), a threaded hole on the base (24) on the same axis, a first insertion rod (22) threadedly connected in the threaded hole, and a second insertion rod (25) on the other side of the flange (23), the second insertion rod (25) being inserted into the shaft hole (26) on the corresponding side of the main shaft (1).

2. The hoisting fixture for painting rail transit gearboxes according to claim 1, characterized in that, The axis of the first insertion rod (22) is arranged along the diameter direction of the lifting lug (21).

3. The hoisting fixture for painting rail transit gearboxes according to claim 2, characterized in that, The second insert (25) is arranged coaxially with the threaded hole of the base (24).

4. The hoisting fixture for painting rail transit gearboxes according to claim 3, characterized in that, The outer surface of the second insertion rod (25) is covered with a nylon sleeve (27), the nylon sleeve (27) has an annular outer edge (29), the diameter of the annular outer edge (29) is the same as the diameter of the flange (23), and the annular outer edge (29) is arranged close to the surface of the flange (23).

5. The hoisting fixture for painting rail transit gearboxes according to claim 4, characterized in that, The nylon sleeve (27) is provided with a guide end (28) at one end.

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