Limiting stop device and method for protecting brake beam under working condition of car dumper

Abstract

The invention discloses a limiting stop device and method for protecting a brake beam under the working condition of a car dumper, solves the problem that the brake beam of the car dumper is easy to crush in the prior art, and has the beneficial effects that the structure is simple, the brake beam is prevented from being damaged, and the limiting stop device is suitable for various working conditions. According to the specific scheme, the limiting stop device for protecting the brake beam under the working condition of the car dumper comprises a limiting stop assembly, the limiting stop assembly is installed through a swing bolster or a bogie side frame upper chord, the limiting stop assembly is arranged between the bogie side frame upper chord and the swing bolster, and the limiting stop assembly comprises a stop block; the outer ends of the check blocks exceed the bogie side frame upper chords, the length of the check blocks is larger than the width of the bogie side frame upper chords, and the check blocks and the bogie side frame upper chords are arranged at intervals.

Description

Technical Field

[0001] This invention relates to the field of railway freight car technology, and in particular to a limit stop device and method for protecting the brake beam under tipper operation. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] When unloading cargo from open railway wagons, two methods are generally used: excavators or tippers. Tippers have less impact on the lifespan of the open wagons and offer faster, cleaner unloading, making them more suitable for the current high-efficiency development of railway freight. Currently, the main types of tippers are rotary tippers and side-tilting tippers. Rotary tippers operate on the principle of "first tilting, then compressing," and are widely used in large ports and mines with reserves exceeding 100 million tons, especially in Africa. Side-tilting tippers operate on the principle of "first compressing, then tilting," and are commonly used in mines and other similar applications in some countries.

[0004] Research has revealed that in some countries, railway freight car bogies frequently exhibit a downward bending of the brake beam in the middle. Analysis indicates that this is caused by the use of rotary tippers. Due to the "tilt-and-press" principle, during the tipping phase before pressing, the bolster side frames of the open car bogie experience relative displacement. This causes the fulcrum and brake levers of the bogie's basic braking device to fold inwards, ultimately bending the brake beam after the car is unloaded. This situation adversely affects vehicle braking performance and compromises freight car safety.

[0005] The specific reason is during normal operation, see reference. Figure 1 As shown, one end of the brake lever 4 is connected to the bogie 3 via the bogie fulcrum seat 8. The angle of the brake lever 4 is close to vertical. Due to the weight of the car body pressing on the bogie, the distance between the bogie 3 and the side frame is relatively large. The brake lever fulcrum always faces outward from the bogie 3, and the brake lever fulcrum 7 will not pass the dead point. (Reference) Figure 2 As shown, when the vehicle is loaded onto the tipper or the car body is lifted directly, since only the bogie bolster 3 and the car body are connected, the car body will pull the bogie bolster 3 upward, and the distance between it and the upper chord of the side frame will decrease. At this time, the brake lever fulcrum may pass the dead point and flip inward towards the bolster. At this time, the brake lever 4 and the brake beam support 9 will form a very small acute angle. When the whole car falls back onto the track, it is equivalent to the entire weight of the car passing through the bolster 3 → brake lever fulcrum 7 → brake lever 4 → brake beam 10 and pressing on the brake beam. That is, because the brake lever has passed the dead point and is stuck inward, the angle between the brake lever and the brake beam support becomes smaller, and the brake lever and the brake beam contact the side facing the center, causing compression, which leads to the brake beam being bent in the middle. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a limiting device for protecting the brake beam under tipper conditions. It has a simple structure, is easy to use, and is suitable for newly manufactured railway freight cars as well as for relatively simple maintenance and repair scenarios where drilling and milling equipment cannot be used or welding conditions are not available.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: A limiting device for protecting the brake beam under tipper operation includes a limiting assembly. The limiting assembly is installed via a bolster or the upper chord of the bogie side frame. The limiting assembly is positioned between the upper chord of the bogie side frame and the bolster. The limiting assembly includes a stop block. The outer end of the stop block extends beyond the upper chord of the bogie side frame. The length of the stop block is greater than the width of the upper chord of the bogie side frame. The stop block is spaced apart from the upper chord of the bogie side frame.

[0008] As described above, a limiting device for protecting the brake beam under tipper operation, wherein the stop block is a rectangular block, the stop block is a hollow structural component, and the stop block is arranged along the length direction of the bolster.

[0009] As described above, a limiting device for protecting the brake beam under tipper operation is provided, wherein the limiting device is detachably mounted on the upper surface of both ends of the bolster via a first fastener, so as to be suitable for drillable bolsters.

[0010] As described above, a limiting stop device for protecting the brake beam under tipper operation includes a connecting plate on both sides of the stop block. The connecting plate is welded to the bottom of the stop block, and the first fastener passes through the connecting plate and the bolster to lock it in place.

[0011] As described above, a limiting stop device for protecting the brake beam under tipper operation has a notch in the limiting stop assembly, into which the bolster intermediate beam can be inserted. The limiting stop assembly is provided with a positioning block that can be engaged in the opening of the bolster intermediate beam to accommodate bolsters that cannot be drilled.

[0012] As described above, a limiting stop device for protecting the brake beam under tipper operation is provided, wherein the limiting stop assembly is disposed across the upper side of the bolster, the limiting stop assembly includes a clamping part having the notch, the top side of the clamping part is welded to the stop block, and the positioning block is disposed on one side of the clamping part.

[0013] As described above, a limiting stop device for protecting the brake beam under tipper operation includes two L-shaped plates spaced apart, one of which is longer than the other. The positioning block is fixed to the inner side of the longer L-shaped plate. The upper sides of the two L-shaped plates are detachably connected to one end of the support body, and the other end of the support body is welded to the stop block.

[0014] As described above, a limiting device for protecting the brake beam under tipper conditions includes a slot body that bypasses the reinforcing rib of the upper chord of the bogie side frame. A slot is formed inside the slot body, and a stop block is placed in the slot. A third fastener connects the stop block and the slot body, making it suitable for maintenance scenarios where welding operations are not possible.

[0015] As described above, a limiting device for protecting the brake beam under tipper operation includes a first groove and a second groove, which are arranged opposite to each other and respectively abut against the reinforcing ribs of the upper chord of the bogie side frame.

[0016] Secondly, the present invention also provides a method for operating a limiting stop device for protecting the brake beam under tipper conditions, comprising the following: A limit stop assembly is installed on the bolster before it leaves the factory, or a limit stop assembly is set between the upper chord of the bogie side frame and the bolster according to the maintenance scenario. The limit stop assembly is installed on the upper surface of both ends of the bolster. The limit stop assembly is placed between the upper chord of the bogie side frame and the bolster. The limit stop assembly includes a stop block. The outer end of the stop block is set beyond the upper chord of the bogie side frame. The length of the stop block is greater than the width of the upper chord of the bogie side frame. When the vehicle is loaded onto the tipper or the car body is lifted directly, the car body moves upward along with the bolster, and the distance between it and the upper chord of the side frame decreases. Because the stop block is placed between the upper chord of the side frame of the bogie and the bolster, the distance between the bolster and the upper chord of the side frame is maintained, thus avoiding the phenomenon of the brake lever fulcrum going too far.

[0017] The beneficial effects of the present invention are as follows: 1) The limiting stop device provided by the present invention uses the bolster or the upper chord of the bogie side frame to set the limiting stop assembly. The limiting stop assembly is placed between the upper chord of the bogie side frame and the bolster, so that the upper plane of the bolster end is always kept at a certain distance from the upper chord of the bogie side frame, regardless of the tipper operation or other abnormal operating conditions. The structure is simple and easy to use. It is suitable for newly manufactured railway freight cars and relatively simple maintenance and repair scenarios such as when drilling and milling equipment cannot be used or welding conditions are not available.

[0018] 2) This invention is aimed at newly manufactured railway vehicles. In the first scheme, the limit stop assembly can be detachably installed on the upper surface of both ends of the bolster via the first fastener. In the second scheme, the limit stop assembly is provided with a notch to cooperate with the middle beam of the bolster, which is suitable for bolsters that cannot be drilled and is suitable for adding the limit stop assembly after maintenance. In the third scheme, the limit stop assembly is provided with a slot body, which is installed using the upper chord of the bogie side frame, which facilitates quick installation in maintenance scenarios and does not involve welding operations during the installation process.

[0019] 3) In the second embodiment of the present invention, the structure of the bolster middle beam is used to set a limiting stop assembly. The limiting stop assembly is provided with a notch, and the bolster middle beam can be inserted into the notch and effectively positioned by the positioning block to ensure the stability of the structure. The upper side of the corresponding limiting stop assembly, i.e. the corresponding stop block, can be placed on the upper side of the bolster to separate the bolster and the upper chord of the bogie side frame.

[0020] 4) In the third embodiment of the present invention, the reinforcing ribs of the upper chord of the bogie side frame are used to form an opening between the reinforcing ribs and the upper chord of the bogie side frame, which can realize the attachment of the slot body and the support of the corresponding stop block. After the support is completed, it is locked by the third fastener to ensure the stability of the stop block setting. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the rocker arm and brake lever in their normal state in the prior art.

[0023] Figure 2 This is a schematic diagram of the brake lever fulcrum passing through the dead point when a vehicle is placed on a tipper or the vehicle body is directly lifted, in the existing technology.

[0024] Figure 3 This is an enlarged schematic diagram of a limit stop device for protecting the brake beam under tipper operation, as shown in Embodiment 1 of the present invention, installed at the bolster.

[0025] Figure 4 This is a schematic diagram of a limit stop device for protecting the brake beam under tipper conditions, as shown in Embodiment 1 of the present invention, installed at the bolster (with the upper chord of the bogie side frame removed).

[0026] Figure 5 This is an enlarged schematic diagram of a limit stop device for protecting the brake beam under tipper operation, as shown in Embodiment 2 of the present invention, installed at the bolster.

[0027] Figure 6 This is a schematic diagram of a limit stop device for protecting the brake beam under the working condition of a tipper, according to Embodiment 2 of the present invention.

[0028] Figure 7 This is a schematic diagram of a portion of the structure of a limit stop device for protecting the brake beam under tipper conditions, as described in Embodiment 2 of the present invention.

[0029] Figure 8 This is a schematic diagram of a limit stop device for protecting the brake beam under tipper conditions, as described in Embodiment 3 of the present invention, installed behind the upper chord of the bogie side frame.

[0030] Figure 9 This is a schematic diagram of a limit stop device for protecting the brake beam under tipper operation in Embodiment 3 of the present invention after the cotter pin is installed.

[0031] Figure 10 This is the present invention. Figure 9 A schematic diagram of section AA.

[0032] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0033] The components include: 1. Side frame upper chord; 2. First limit stop assembly; 3. Pillar; 4. Brake lever; 5. Second limit stop assembly; 6. Second limit stop assembly; 7. Brake lever fulcrum; 8. Pillar fulcrum seat; 9. Brake beam support; 10. Brake beam; 11. Reinforcing rib; 12. Pillar intermediate beam; 13. Opening; 2.1 First stop block; 2.2 Connecting plate; 2.3 First fastener; 5.1 Support body; 5.2 Clamping part; 5.3 L-shaped plate; 5.4 Nut; 5.5 Clamping plate on the longer side; 5.6 Positioning block; 5.7 Blocking plate; 5.8 Second stop block; 6.1 First groove; 6.2 Third stop; 6.3 Second groove; 6.4 Third fastener; 6.5 First section; 6.6 Second section. Detailed Implementation

[0034] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. As described in the background section, existing tipplers are prone to damaging the brake beam. To address this technical problem, this invention proposes a limit stop device for protecting the brake beam during tippler operation.

[0036] In a typical embodiment of the present invention, a limiting stop device for protecting the brake beam under tipper conditions includes a limiting stop assembly. The limiting stop assembly is installed via a bolster 3 or a bogie side frame upper chord 1. The limiting stop assembly is positioned between the bogie side frame upper chord 1 and the bolster 3. The limiting stop assembly includes a stop block. The outer end of the stop block extends beyond the outer surface of the bogie side frame upper chord 1. The length of the stop block is greater than the width of the bogie side frame upper chord 1. The stop block is spaced apart from the bogie side frame upper chord. The stop block is positioned between the bogie side frame upper chord 1 and the bolster 3. Under normal conditions, the stop block can be positioned close to the upper plane of the bolster 3 or close to the bogie side frame upper chord. When the car body moves upward with the bolster, the distance between the bogie side frame upper chord 1 and the bolster 3 is always maintained.

[0037] In addition, the stop block is a rectangular block and a hollow structural component. The stop block is set along the length of the rocker arm 3 and is placed in the middle of the upper plane of the rocker arm 3 to play a limiting role. When the vehicle is loaded onto the tipper or the vehicle body is directly lifted, the rocker arm 3 is moved upward by the vehicle body. The setting of the stop block effectively restricts the rocker arm 3 from moving upward, so that the rocker arm 3 and the side frame always maintain a safe distance. In this way, the brake lever and the fulcrum will never exceed the dead point.

[0038] Example 1 In this embodiment, reference Figure 3 and Figure 4 As shown, the first limit stop assembly 2 is detachably installed on the upper surface of both ends of the bolster 3 via the first fastener 2.3, so as to be suitable for drillable bolster 3 and bolster 3 of newly manufactured railway vehicles.

[0039] Specifically, for the bolster 3 of newly manufactured railway vehicles, bolt holes are pre-milled into the upper surface of both ends of the bolster 3 by machining. The first limit stop assembly 2 is installed on the upper surface of both ends of the bolster 3.

[0040] refer to Figure 2 As shown, the first limiting stop assembly 2 includes a stop block, which is a first stop block 2.1. Connecting plates 2.2 are respectively provided on both sides of the first stop block 2.1. The length of the connecting plates 2.2 is less than the length of the first stop block 2.1. The connecting plates 2.2 are provided with openings. The connecting plates 2.2 are welded to the first stop block 2.1 to ensure a reliable connection between the connecting plates 2.2 and the first stop block 2.1. The bottoms of the connecting plates 2.2 and the first stop block 2.1 are placed on the same plane. The height of the connecting plates 2.2 is less than the height of the first stop block 2.1. The first fastener 2.3, such as the first bolt, passes through the washer, the opening of the connecting plate 2.2 and the bolt hole on the upper surface of the rocker 3 and is then locked by the anti-loosening nut, thereby fixing the first stop block 2.1 to the rocker 3.

[0041] Specifically, the first stop 2.1 is made of a rectangular tube, which is cut to a suitable length to obtain the first stop 2.1. The length direction of the first stop 2.1 is set along the length direction of the rocker 3. Regardless of any changes in casting tolerance and casting fit clearance, most of the length of the first stop 2.1 can be located below the upper chord 1 of the side frame. The connecting plate 2.2 is made of a suitable width so that it does not interfere with the rocker's wedge stop and casting markings.

[0042] Example 2 The limiting stop assembly provided in this embodiment is a second limiting stop assembly 6. The second limiting stop assembly 6 has a notch, into which the middle beam 12 of the rocker bolster can be inserted to fix the second limiting stop assembly 6. In this way, the second limiting stop assembly 6 does not need to be fixed to the rocker bolster 3 by bolts or welding. The second limiting stop assembly 6 is provided with a positioning block 5.8, which can be inserted into the opening of the middle beam 12 of the rocker bolster to be suitable for maintenance scenarios where the rocker bolster 3 cannot be drilled but welding operations can be performed. refer to Figure 5 and Figure 6 As shown, the second limiting stop assembly 6 is positioned across the upper side of the rocker 3 through the notch, so that the stop block in the second limiting stop assembly 6 is positioned above the rocker 3. The second limiting stop assembly 6 includes a clamping part 5.2 with a notch. A positioning block 5.6 is provided on one side of the clamping part 5.2. The clamping part 5.2 clamps the support body 5.1. The clamping part 5.2 is fixedly connected to one side of the support body 5.1. A stop block is provided at the other end of the support body 5.1. The stop block is a second stop block 5.8. The second stop block 5.8 is a rectangular tube. The distance between the second stop block 5.8 and the horizontal section of the clamping part is set so that the second limiting stop assembly 6 can cross the upper surface of the rocker 3.

[0043] Specifically, the clamping part 5.2 consists of two L-shaped plates 5.3 spaced apart, with the support body 5.1 clamped between the two L-shaped plates 5.3. The L-shaped plates 5.3 are specifically L-shaped steel plates, with one side being a horizontal section and the other side being a vertical section. Two round holes are drilled and milled into the vertical section of the L-shaped plate. The horizontal section of one of the two L-shaped plates is longer than the horizontal section of the other L-shaped plate. A positioning block 5.6 is provided on the side of the longer clamping plate 5.5 facing the other L-shaped plate. The height of the positioning block 5.6 is less than the height of the horizontal section of the L-shaped plate, and the size of the positioning block 5.6 is adapted to the size of the opening in the middle beam 12 of the bolster. The support body is also an L-shaped structural component. Two round holes are milled on the vertical side of the support body 5.1. The second fastener, such as the second bolt, passes through the L-shaped plate and the round holes of the support body and is locked by the nut 5.4 to achieve the fixed connection between the clamping part 5.2 and the support body 5.1.

[0044] In this embodiment, the support body is specifically a support plate, and the side of the support plate away from the clamping part 5.2 is welded to the blocking plate 5.7, as shown in the reference. Figure 7 As shown, the blocking plate 5.7 is welded to the second stop 5.8. The size of the blocking plate 5.7 is similar to that of the second stop 5.8, and the side of the blocking plate 5.7 is reliably welded to the second stop 5.8.

[0045] Example 3 The limiting stop assembly disclosed in this embodiment is the third limiting stop assembly 6, as referenced. Figure 8 As shown, the third limit stop assembly 6 includes a slot body that bypasses the reinforcing rib 11 of the upper chord of the bogie side frame. A slot is formed inside the slot body, and the stop is a third stop 6.2, which is placed in the slot and supported by the slot. A third fastener 6.4 connects the third stop 6.2 and the slot body. This design is suitable for maintenance scenarios where welding operations are not feasible. During maintenance, the slot body is supported by the reinforcing rib 11 of the upper chord of the bogie side frame, so that the upper chord of the bogie side frame can be used to install the third limit stop assembly 6.

[0046] Specifically, the slot body includes a first slot 6.1 and a second slot 6.3, which are arranged opposite to each other. The first slot 6.1 and the second slot 6.3 are respectively attached to the reinforcing rib 11 of the upper chord of the bogie side frame. The first slot 6.1 and the second slot 6.3 are U-shaped structural members to support the third stop 6.2. (Refer to the previous section for details.) Figure 10 As shown, the first groove 6.1 includes a first segment 6.5 and a second segment 6.6 connected in sequence. The upper side of the first segment 6.5 is bent to abut against the reinforcing rib 11 of the upper chord of the bogie side frame. Because the reinforcing rib 11 and the upper chord of the side frame are spaced apart to form an opening 13, the first groove and the second groove are attached to the reinforcing rib 11 through the opening. The second segment 6.6 is connected to the third stop 6.2, so that the groove is attached from the opening 13 and extends towards the center of the bolster 3. The length of the third stop 6.2 is less than the length of the first groove 6.1 and the second groove 6.3.

[0047] During installation, place the third stop 6.2 against the reinforcing rib 11 directly below the center of the upper chord of the bogie side frame. Use the first groove 6.1 and the second groove 6.3 on the left and right sides as hooks to hang it on the reinforcing rib. Simultaneously, use the third fastener 6.4 (such as the third bolt) to pass through the third stop 6.2 and the groove, and tighten with a lock nut. (Refer to...) Figure 8 As shown, the cotter pin is designed to prevent the item from coming off.

[0048] Example 4 This embodiment discloses the working method of a limit stop device for protecting the brake beam under the working condition of a tipper, as described in Embodiments 1, 2, and 3, including the following: According to the maintenance scenario, select the appropriate limit stop assembly. The limit stop assembly is installed on the upper plane of both ends of the bolster. The limit stop assembly is placed between the upper chord 1 of the bogie side frame and the bolster 3. The limit stop assembly includes a stop block. The outer end of the stop block extends beyond the upper chord 1 of the bogie side frame. The length of the stop block is greater than the width of the upper chord 1 of the bogie side frame. When the vehicle is loaded onto the tipper or the car body is lifted directly, the car body moves upward along with the bolster 3, and the distance between it and the upper chord 1 of the side frame decreases. Because the stop block is placed between the upper chord 1 of the side frame of the bogie and the bolster 3, the distance between the bolster 3 and the upper chord 1 of the side frame is maintained, thus avoiding the phenomenon of the brake lever fulcrum going too far.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A limiting device for protecting the brake beam under tipper operation, characterized in that, The system includes a limit stop assembly, which is installed via the bolster or the upper chord of the bogie side frame. The limit stop assembly is positioned between the upper chord of the bogie side frame and the bolster. The limit stop assembly includes a stop block, the outer end of which extends beyond the upper chord of the bogie side frame. The length of the stop block is greater than the width of the upper chord of the bogie side frame, and the stop block is spaced apart from the upper chord of the bogie side frame.

2. A limiting device for protecting the brake beam under tipper operation as described in claim 1, characterized in that, The stop block is a rectangular block, a hollow structural component, and is arranged along the length of the rocker arm.

3. A limiting device for protecting the brake beam under tipper operation as described in claim 1, characterized in that, The limiting stop assembly is detachably mounted on the upper surface of both ends of the rocker arm via a first fastener, making it suitable for rocker arms that can be drilled.

4. A limiting device for protecting the brake beam under tipper operating conditions according to claim 3, characterized in that, The limiting stop assembly also includes a connecting plate, which is located on both sides of the stop block. The connecting plate is welded to the bottom of the stop block, and the first fastener passes through the connecting plate and the rocker arm to lock it in place.

5. A limiting device for protecting the brake beam under tipper operation as described in claim 1, characterized in that, The limiting stop assembly has a notch into which the middle beam of the rocker can be inserted. The limiting stop assembly is provided with a positioning block that can be engaged in the opening of the middle beam of the rocker to accommodate rockers that cannot be drilled.

6. A limiting device for protecting the brake beam under tipper operation as described in claim 5, characterized in that, The limiting stop assembly is disposed across the upper side of the rocker arm. The limiting stop assembly includes a clamping part with the notch. The top side of the clamping part is welded to the stop block, and the positioning block is disposed on one side of the clamping part.

7. A limiting device for protecting the brake beam under tipper operation as described in claim 6, characterized in that, The clamping part includes two L-shaped plates spaced apart, one of which is longer than the other. The positioning block is fixed to the inner side of the longer L-shaped plate. The upper sides of the two L-shaped plates are detachably connected to one end of the support body, and the other end of the support body is welded to the stop block.

8. A limiting device for protecting the brake beam under tipper operation as described in claim 1, characterized in that, The limiting stop assembly includes a slot body that bypasses the reinforcing rib of the upper chord of the bogie side frame. A slot is formed inside the slot body, and the stop block is placed in the slot. A third fastener connects the stop block and the slot body to suit maintenance scenarios where welding operations are not possible.

9. A limiting device for protecting the brake beam under tipper operation as described in claim 1, characterized in that, The slot body includes a first slot and a second slot, which are arranged opposite to each other. The first slot and the second slot are respectively attached to the reinforcing ribs of the upper chord of the bogie side frame.

10. The operating method of the limiting stop device for protecting the brake beam under the working condition of a tipper according to any one of claims 1-9, characterized in that, Includes the following: A limit stop assembly is installed on the bolster before it leaves the factory, or a limit stop assembly is set between the upper chord of the bogie side frame and the bolster according to the maintenance scenario. The limit stop assembly is installed on the upper surface of both ends of the bolster. The limit stop assembly is placed between the upper chord of the bogie side frame and the bolster. The limit stop assembly includes a stop block. The outer end of the stop block is set beyond the upper chord of the bogie side frame. The length of the stop block is greater than the width of the upper chord of the bogie side frame. When the vehicle is loaded onto the tipper or the car body is lifted directly, the car body moves upward along with the bolster, and the distance between it and the upper chord of the side frame decreases. Because the stop block is placed between the upper chord of the side frame of the bogie and the bolster, the distance between the bolster and the upper chord of the side frame is maintained, thus avoiding the phenomenon of the brake lever fulcrum going too far.

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