A train body lifting device for air spring compensation pad retrofitting

Abstract

The utility model provides a kind of for train air spring compensation gasket additional vehicle body lifting device, comprising: lifting component, including upper portion top rod and lower portion thick wall top rod, the upper portion top rod is installed on the lower portion thick wall top rod;Positioning sleeve, the outside of the upper portion top rod is sleeved, the outer diameter size of the positioning sleeve and the process hole size clearance fit of air spring bottom;Supporting component, including shaft sleeve and support, the outside of the lower portion thick wall top rod is worn in the shaft sleeve, the outside of the lower portion thick wall top rod and the inside of the shaft sleeve clearance fit, the support is connected with the outside of the shaft sleeve, the support is placed on ground;Adjustable positioning block is set on shaft sleeve, and the adjustable positioning block is adjusted telescopic along the direction parallel to ground.The vehicle body lifting device greatly improves the maintenance efficiency and guarantees maintenance safety.

Description

Technical Field

[0001] This utility model relates to the field of rail transit, specifically to a car body lifting device for installing air spring compensation shims on trains. Background Technology

[0002] When a train is stopped at a platform, the height between the train body and the platform should meet relevant standards. Excessive height difference could cause passengers to trip and fall, posing a safety hazard. However, during normal operation, subway train wheels experience wear. If abnormal conditions such as tread abrasion, ring-shaped peeling, or excessive flange dimensions are observed, wheel turning is necessary. Both of these situations reduce the wheel diameter, thus lowering the height of the train body relative to the rail surface; wheel wear alone can reduce the height by as much as 12mm. To ensure the train height meets standards, adjustments are made by adding compensating shims to the lower part of the air springs. However, installing these shims requires raising the train body to a certain height, so this operation can currently only be performed on dedicated tracks (fixed maintenance tracks), and requires the deployment of locomotives, making the process cumbersome and inefficient.

[0003] The key issues that need to be addressed are as follows: Issue ①: When the train is parked on the maintenance track, the process hole for installing the compensation shims under the air spring is about 1.2 meters above the ground, making it impossible to operate directly with a jack. Issue ②: The positioning accuracy of the jack provided on-site is poor, making it impossible to guarantee reliable contact with the working surface each time. Issue ③: The lifting process hole at the bottom of the air spring is very close to the rail (almost touching the rail), limiting the available space for operation. Issue ④: If the jack is placed on a concrete surface, it is prone to damaging the ground during operation and has poor reliability.

[0004] Therefore, to improve maintenance efficiency and reduce workload, a car body lifting device is needed to work in conjunction with jacks to raise the car body of a train parked on a frequently used maintenance track to a certain height (e.g., an additional 20mm from the original height) to accommodate compensating shims. This car body lifting device ensures the safe and reliable lifting of the car body during jack operation. Utility Model Content

[0005] To address the aforementioned issues, this application provides a vehicle body lifting device for installing air spring compensation shims on trains. This device enables the installation of air spring compensation shims even when the train is parked on a regular track, significantly improving maintenance efficiency and ensuring maintenance safety.

[0006] This application proposes a car body lifting device for installing air spring compensation shims on trains, comprising:

[0007] The lifting component includes an upper push rod and a lower thick-walled push rod, wherein the upper push rod is mounted on the lower thick-walled push rod;

[0008] A positioning sleeve is fitted onto the outside of the upper top rod, and the outer diameter of the positioning sleeve is clearance-fitted with the process hole size at the bottom of the air spring.

[0009] The support component includes a bushing and a bracket. The bushing passes through the outer side of the lower thick-walled top rod, and the inner side of the bushing is clearance-fitted with the outer side of the lower thick-walled top rod. The bracket is connected to the outer side of the bushing, and the bracket is placed on the ground.

[0010] An adjustable positioning block is mounted on the bushing. The adjustable positioning block can be adjusted to extend and retract in a direction parallel to the ground. It is used for longitudinal positioning between the car body lifting device and the train air spring, as well as for limiting the longitudinal displacement of the car body lifting device.

[0011] In one embodiment, the bottom of the upper push rod has a groove, and the top of the lower thick-walled push rod has a protrusion that matches the groove. The upper push rod is installed on the lower thick-walled push rod through the cooperation of the groove and the protrusion.

[0012] In one embodiment, the bracket includes multiple support rods and multiple corner braces. One end of each support rod is mounted on the outer wall of the bushing, and the other end of the support rod is placed on the ground. One side of each corner brace is mounted on the support rod, and the other side of each corner brace is mounted on the bushing.

[0013] In one embodiment, the vehicle body lifting device further includes a base plate, which is placed on the ground, and the bracket is placed on the ground via the base plate.

[0014] In one embodiment, the base plate is provided with a jack placement position for placing jacks.

[0015] In one embodiment, the upper push rod and the lower thick-walled push rod are made of carbon steel, and the positioning sleeve is made of nylon.

[0016] In one embodiment, the distance between the outer side of the positioning sleeve and the inner side of the process hole at the bottom of the air spring is 2mm.

[0017] In one embodiment, the distance between the inner side of the positioning sleeve and the outer side of the upper top rod ranges from 0 to 0.1 mm.

[0018] In one embodiment, the distance between the inner side of the bushing and the outer side of the lower thick-walled top rod is 2 mm.

[0019] The car body lifting device for installing air spring compensation shims in this application has the following beneficial effects:

[0020] This vehicle lifting device can be used with jacks to lift a vehicle body up to 1.2 meters in height, and it features dual auxiliary positioning functions, enabling quick and precise positioning of the jack rod at the lifting point. The T-shaped design of the device solves the problem of limited operating space. It also includes a jack auxiliary mounting position, ensuring no damage to the ground during operation, and features an anti-slip design and leveling adjustment function. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a vehicle body lifting device according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram illustrating the usage method of the vehicle body lifting device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the upper top rod of the vehicle body lifting device according to an embodiment of the present utility model, wherein (a) is a front view, (b) is a cross-sectional view along AA in (a), (c) is a bottom view, and (d) is a three-dimensional structural diagram;

[0024] Figure 4 This is a schematic diagram of the upper push rod and positioning sleeve of the vehicle body lifting device according to an embodiment of the present invention, wherein (a) is a front view, (b) is a cross-sectional view along BB in (a), (c) is a bottom view, and (d) is a three-dimensional structural diagram.

[0025] Figure 5 This is a schematic diagram of the positioning sleeve of the vehicle body lifting device according to an embodiment of the present utility model, wherein (a) is a front view, (b) is a cross-sectional view along CC in (a), (c) is a bottom view, and (d) is a three-dimensional structural diagram.

[0026] Figure 6 This is a schematic diagram of the lower thick-walled top rod of the vehicle body lifting device according to an embodiment of the present utility model, wherein (a) is a front view, (b) is a cross-sectional view along DD in (a), and (c) is a three-dimensional structural diagram;

[0027] Figure 7 This is a schematic diagram of the structure of the upper push rod and the lower thick-walled push rod of the vehicle body lifting device according to an embodiment of the present utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the support component of the vehicle body lifting device according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the upper push rod, the lower thick-walled push rod, and the positioning sleeve of the vehicle body lifting device according to an embodiment of the present invention.

[0030] Figure Labels

[0031] Upper top rod 1, lower thick-walled top rod 2, positioning sleeve 3, bushing 4, adjustable positioning block 5, support rod 6, corner brace 7, base plate 8, jack placement position 9, car body lifting device 10, secondary spring 11, wheel wear adjustment pad 12, existing setting adjustment pad 13, bogie centerline L. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] The bogie is a structure at the bottom of a train used to support the car body, connect the wheels, and enable the train to move and turn. It typically includes components such as air springs, wheels, and secondary suspension springs. During the installation of air spring compensation shims, the gap between the bottom of the air spring and the bogie is where the shims need to be inserted.

[0034] like Figure 1 As shown, this application proposes a car body lifting device 10 for installing air spring compensation shims on trains, including: lifting components, positioning sleeves 3, support components and adjustable positioning blocks 5.

[0035] like Figure 7 As shown, the lifting component includes an upper push rod 1 and a lower thick-walled push rod 2, with the upper push rod 1 mounted on the lower thick-walled push rod 2. Figure 4 , Figure 5 and Figure 9 As shown, the positioning sleeve 3 is fitted onto the outside of the upper push rod 1, and the outer diameter of the positioning sleeve 3 is clearance-fitted with the process hole size at the bottom of the air spring. The support components include a bushing 4 and a bracket. The bushing 4 passes through the outside of the lower thick-walled push rod 2, and the inner side of the bushing 4 is clearance-fitted with the outer side of the lower thick-walled push rod 2. The bracket is connected to the outer side of the bushing 4, and the bracket is placed on the ground. An adjustable positioning block 5 is set on the bushing 4. The adjustable positioning block 5 can be adjusted and extended in a direction parallel to the ground, and is used for longitudinal positioning between the car body lifting device 10 and the train air spring, as well as for limiting the longitudinal displacement of the car body lifting device 10.

[0036] Specifically, the adjustable positioning block 5 is welded to the bushing 4, and its function is mainly reflected in two aspects: First, it enables rapid longitudinal positioning between the car body lifting device 10 and the equipment (i.e., the train air spring and surrounding structure). Here, "longitudinal" can be understood as along the length of the train. By adjusting the adjustable positioning block 5, the car body lifting device 10 can quickly align with the target positions such as the lifting process holes at the bottom of the train air spring, reducing positioning adjustment time and improving work efficiency. Second, it can limit the longitudinal displacement of the car body lifting device 10, that is, limit the range of movement of the lifting device in the longitudinal direction, prevent the device from excessive longitudinal displacement due to accidents during operation (such as when the jack is under force), avoid deviation from the lifting position, and thus ensure the accuracy and safety of the operation.

[0037] In one embodiment, the bottom of the upper push rod 1 has a groove (see...). Figure 3 The top of the lower thick-walled top rod 2 is provided with a protrusion that matches the groove (see...). Figure 6 The upper push rod 1 is installed on the lower thick-walled push rod 2 through the engagement of a groove and a protrusion (see...). Figure 7 The upper jack has a groove at its bottom, and the upper part of the lower reinforced thick-walled jack fits concentrically with this groove. This means that the groove mates with the corresponding protruding structure (the top of the lower thick-walled jack) during installation, ensuring that their axes are aligned and the lifting force is stably transmitted. The lower part of the lower thick-walled jack 2 is the force-bearing surface of the jack during operation.

[0038] In one embodiment, the bracket includes multiple support rods 6 and multiple gusset plates 7. One end of the support rod 6 is mounted on the outer wall of the bushing 4, and the other end of the support rod 6 rests on the ground. One side of the gusset plate 7 is mounted on the support rod 6, and the other side of the gusset plate 7 is mounted on the bushing 4. See [link / reference needed] Figure 8 Specifically, the support rod 6 and the gusset plate 7 are connected to the bushing 4 by welding. The specific connection relationship is as follows: one end of the support rod 6 is directly welded to the outer wall of the bushing 4, and the other end is welded to the base plate 8. Through this vertical or inclined welding fixation, the bushing 4 and the base plate 8 are connected as a whole, ensuring that the bushing 4 will not shake or shift during lifting operations. The gusset plate 7, as a reinforcing structure, is usually welded at the connection points between the support rod 6 and the bushing 4, and between the support rod 6 and the base plate 8. Its connection with the bushing 4 is specifically as follows: one side of the gusset plate 7 is welded to the outer wall of the bushing 4, and the other side is welded to the side of the support rod 6, forming a triangular support structure. This further enhances the fixing strength of the support rod to the bushing, preventing the bushing 4 from deforming or loosening due to excessive force when bearing the lifting force of the jack. This ensures the high stability between the bushing and the base plate, providing reliable spatial support for the placement of the jack.

[0039] In one embodiment, the vehicle body lifting device 10 further includes a base plate 8, which is placed on the ground, and the bracket is placed on the ground via the base plate 8.

[0040] In one embodiment, a jack placement position 9 is provided on the base plate 8, which is used to place jacks.

[0041] In one embodiment, the upper push rod 1 and the lower thick-walled push rod 2 are made of carbon steel, and the positioning sleeve 3 is made of nylon. Preferably, in this embodiment, the upper push rod 1 and the lower thick-walled push rod 2 are made of 45# carbon steel.

[0042] In one embodiment, the outer diameter of the positioning sleeve 3 and the clearance between the process hole at the bottom of the air spring are 2mm. Specifically, the outer diameter of the positioning sleeve is 2mm smaller than the inner diameter of the process hole at the bottom of the air spring, and there is a 2mm gap between them after assembly. This fit facilitates the smooth insertion of the positioning sleeve into the process hole, while reserving a certain adjustment space for quick alignment.

[0043] In one embodiment, the inner side of the positioning sleeve 3 forms a transition fit with the upper push rod 1, with a tolerance of +0.1mm / 0mm. A transition fit is a type of fit between a clearance fit and an interference fit, where the inner diameter of the positioning sleeve is 0-0.1mm larger than the outer diameter of the push rod (i.e., the minimum inner diameter of the positioning sleeve is equal to the outer diameter of the push rod, and the maximum inner diameter is 0.1mm larger than the outer diameter of the push rod). This fit ensures a tight, secure fit between the push rod and the positioning sleeve, guaranteeing accurate positioning, and also allows for smooth assembly of both.

[0044] The upper part of the positioning sleeve forms a clearance fit with the bottom process hole of the air spring, and the inner side forms a transition fit with the upper push rod. Its main function is to accurately position the upper push rod to the lifting part of the vehicle body (the bottom process hole of the air spring) through the dual fit with the process hole and the push rod. The upper push rod and the lower thick-walled push rod are directly fitted by the groove and the protrusion structure.

[0045] In one embodiment, the clearance between the inner side of the bushing 4 and the outer side of the lower thick-walled push rod 2 is 2mm. That is, the outer diameter of the thick-walled push rod is 2mm smaller than the inner diameter of the bushing, resulting in a 2mm gap between them after assembly. This fit allows the thick-walled push rod to move smoothly up and down within the bushing (to cooperate with the lifting action of the jack), while the bushing guides and limits the thick-walled push rod, ensuring its stability during lifting under load and preventing lateral displacement, thereby guaranteeing the accuracy and reliability of the overall lifting device.

[0046] like Figure 2As shown, the process hole is located at the center of the bottom of the air spring (aligned with the "bogie centerline"). It is a pre-drilled circular or irregularly shaped hole at the bottom of the air spring, used to allow the top of the lifting device to be inserted (or fitted) during lifting operations, thereby accurately transmitting the lifting force to the bottom of the air spring and achieving car body lifting. The secondary spring 11 is the core suspension component between the car body and the bogie (located above the air spring in the figure). Its main function is to support the weight of the car body, transfer the car body load (such as the weight of passengers and equipment) to the bogie, absorb vibrations and impacts caused by track irregularities (such as bumps, switches, and curves), improve ride comfort, and, in conjunction with the elasticity of the air spring, maintain the vertical height and horizontal alignment of the car body, ensuring the stability of train operation. During train operation, the wheels gradually wear down due to friction with the track, resulting in a decrease in the overall height of the wheelset, which in turn affects the installation height and suspension performance of the air spring. By increasing or decreasing the thickness of the wheel wear adjustment pad 12, the height difference caused by wheel wear is compensated, ensuring that the vertical clearance of the air spring and the height of the car body meet the design standards. The existing adjustment shims 12 are shims reserved for initial installation or early maintenance, used to calibrate system tolerances. These shims compensate for manufacturing tolerances (such as dimensional deviations) in components like the bogie, air springs, and car body, ensuring accurate initial air spring installation height; they also fine-tune the relative position of the car body and bogie, optimizing the mechanical performance of the secondary suspension (such as vertical stiffness and horizontal alignment accuracy). If subsequent adjustments to the air spring height or suspension parameters are needed, this can be achieved by changing the thickness of these shims (without modifying the main structure). When the compensation shims are installed, the car body lifting device 10 applies force through the process holes at the bottom of the air springs, lifting the car body and creating a bottom gap between the bottom of the air springs and the bogies, facilitating shim insertion. At this time, the secondary springs are responsible for buffering the impact of the lifting process and maintaining the car body's posture. Adjustment shims (especially wheel wear adjustment shims 12) need to be calibrated in advance to ensure a stable suspension height reference before lifting, allowing for more precise control of the bottom gap.

[0047] In one embodiment, the method of using the vehicle body lifting device 10 includes:

[0048] Place the support component at the bottom of the air spring that requires the addition of compensation shims;

[0049] Insert the lower thick-walled push rod into the bushing, then install the positioning sleeve on the upper push rod. After installation, support the bottom of the upper push rod and fully insert the upper push rod into the process hole at the bottom of the air spring.

[0050] Move the support so that the lower thick-walled top rod is aligned with the groove at the bottom of the upper top rod, thus completing the assembly of the lifting component;

[0051] Place the jack and press it to raise the vehicle body. Stop when there is about 20mm gap between the bottom of the air spring and the bogie. Then install the compensation shim at the bottom of the air spring.

[0052] After installation, loosen and remove the jack, and remove the lifting device.

[0053] In one embodiment, the car body lifting device is used by train maintenance workers when installing air spring shims on the 07A02 train. This device overcomes the limitations of air spring compensation shim installation on the 07A02 train: previously, the train had to be parked on a dedicated track (i.e., a designated maintenance track, where the rails are laid on the ground and there is no height difference between the train and the floor), but with this device, even if the train is parked on a regular track (including parking tracks and maintenance tracks, where the rails are higher than the ground and there is a height difference between the train and the floor), the air spring compensation shim installation can still be completed, significantly improving maintenance efficiency and ensuring maintenance safety.

[0054] The car body lifting device for installing air spring compensation shims in this application has the following beneficial effects:

[0055] This vehicle lifting device can be used with jacks to lift a vehicle body up to 1.2 meters in height, and it features dual auxiliary positioning functions, enabling quick and precise positioning of the jack rod at the lifting point. The T-shaped design of the device solves the problem of limited operating space. It also includes a jack auxiliary mounting position, ensuring no damage to the ground during operation, and features an anti-slip design and leveling adjustment function.

[0056] The embodiments described above are merely further illustrations of this application and are not intended to limit this application in any other way. This application may also have various other embodiments. Without departing from the spirit and essence of this application, those skilled in the art can make various corresponding modifications and changes based on this application, but these corresponding modifications and changes should all fall within the protection scope of this application.

Claims

1. A car body lifting device for installing air spring compensation shims on trains, characterized in that, include: The lifting component includes an upper push rod and a lower thick-walled push rod, wherein the upper push rod is mounted on the lower thick-walled push rod; A positioning sleeve is fitted onto the outside of the upper top rod, and the outer diameter of the positioning sleeve is clearance-fitted with the process hole size at the bottom of the air spring. The support component includes a bushing and a bracket. The bushing passes through the outer side of the lower thick-walled top rod, and the inner side of the bushing is clearance-fitted with the outer side of the lower thick-walled top rod. The bracket is connected to the outer side of the bushing, and the bracket is placed on the ground. An adjustable positioning block is mounted on the bushing. The adjustable positioning block can be adjusted to extend and retract in a direction parallel to the ground. It is used for longitudinal positioning between the car body lifting device and the train air spring, as well as for limiting the longitudinal displacement of the car body lifting device.

2. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The upper push rod has a groove at its bottom, and the lower thick-walled push rod has a protrusion at its top that matches the groove. The upper push rod is installed on the lower thick-walled push rod through the cooperation of the groove and the protrusion.

3. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The bracket includes multiple support rods and multiple corner braces. One end of each support rod is mounted on the outer wall of the bushing, and the other end of the support rod is placed on the ground. One side of each corner brace is mounted on the support rod, and the other side of each corner brace is mounted on the bushing.

4. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The vehicle body lifting device also includes a base plate, which is placed on the ground, and the bracket is placed on the ground via the base plate.

5. The car body lifting device for installing air spring compensation shims in trains according to claim 4, characterized in that, The base plate is provided with a jack placement position for placing jacks.

6. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The upper push rod and the lower thick-walled push rod are made of carbon steel, and the positioning sleeve is made of nylon.

7. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The distance between the outer side of the positioning sleeve and the inner side of the process hole at the bottom of the air spring is 2mm.

8. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The distance between the inner side of the positioning sleeve and the outer side of the upper top rod is 0 to 0.1 mm.

9. The car body lifting device for installing air spring compensation shims in trains according to claim 1, characterized in that, The distance between the inner side of the bushing and the outer side of the lower thick-walled top rod is 2mm.

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