A centering indicator device for assembling the center beam and side beam of a railway vehicle

Abstract

The invention discloses a centering indicating device for assembling a center beam and a side beam of a railway vehicle, and relates to the technical field of railway vehicle underframe assembly, comprising: a bottom plate, which is used to be connected to an assembly platform; a guide cylinder, which is connected to the bottom plate through a bracket; a push rod, which is movably inserted into the guide cylinder, and a pointer is arranged at one end of the push rod; a protective plate, which is arranged at one side of the guide cylinder, and a pointer through hole matched with the pointer is opened on the protective plate; a spring, which is arranged between the push rod and the guide cylinder, and the spring can push the push rod to make the pointer move to a side away from the protective plate; the device is provided with a bottom plate connected to the assembly platform, and a push rod and a pointer which can be telescopic in the guide cylinder are arranged above the bottom plate, and the center line of the pointer is conveniently overlapped with the transverse center line of the underframe assembly tire by adjusting the installation position of the bottom plate, and the pointer is aligned with an ideal center point pre-marked at the web of the center beam or the side beam, so as to improve the assembly accuracy of the center beam or the side beam during assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of railway vehicle underframe assembly, and more specifically, relates to a centering indicating device for assembling a center beam and side beams of a railway vehicle. Background Art

[0002] In the process of assembling the center beam or side beam in the existing railway vehicle underframe, the assembly process of the center beam or side beam is as follows: cutting (leaving process allowance at both ends when cutting) - drilling - assembling welding accessories - cutting off process allowance at both ends - underframe assembly on tire - underframe welding - proceed to the next process after passing the inspection.

[0003] The center beam or side beam generally prefers to use steel sections. The steel sections are cut first, and a certain process margin is left at both ends of the steel sections during cutting to prevent the center beam or side beam from shrinking and deforming during the prefabrication, assembly and welding process, which causes the total length to exceed the tolerance. In order to ensure the structural symmetry of the center beam or side beam and facilitate marking, before prefabrication of each beam, the horizontal or vertical center line is marked on the web in the middle to replace or approach the theoretical center line. Then, based on this marked center line, the holes and accessories on the two ends of the center beam or side beam are marked and positioned symmetrically. Next, the center beam or side beam is drilled or the accessories are assembled and welded according to the marked positioning. Then, according to the empirical value of the shrinkage of the center beam or side beam after the chassis is welded, the margin at both ends of the center beam or side beam is cut off, and each beam is assembled on the chassis assembly tire to ensure that the length meets the requirements after the chassis and each beam are assembled and welded.

[0004] In order to ensure the symmetry of the center beam or side beam structure and minimize the assembly size error, when positioning and assembling the center beam or side beam on the chassis assembly tire, the transverse or vertical center line drawn on the middle web of the prefabricated center beam or side beam must be replaced or close to coincide with the transverse center line on the chassis assembly tire. However, the center lines of the two have spatial dimensions, and observation by the naked eye is not only inaccurate, but also has extremely low assembly efficiency. Therefore, a centering indicator device for the assembly of center beams and side beams of railway vehicles is needed to improve the assembly quality and efficiency of the center beams and side beams and facilitate observation and operation. Summary of the invention

[0005] The purpose of the present invention is to provide a centering indicating device for assembling the center beam and side beam of a railway vehicle in view of the deficiencies in the prior art. The device is provided with a base plate connected to an assembly platform, and a push rod and a pointer which can be telescoped in a guide cylinder are provided above the base plate. By adjusting the installation position of the base plate, the center line of the pointer can be conveniently made to coincide with the transverse center line of the underframe assembly tire and the pointer can be made to align with the ideal center point pre-marked on the web of the center beam or the side beam, thereby improving the assembly accuracy when assembling the center beam or the side beam.

[0006] In order to achieve the above object, the present invention provides a centering indicator device for assembling a center beam and a side beam of a railway vehicle, comprising:

[0007] A base plate, used for connecting with the assembly platform;

[0008] A guide cylinder connected to the base plate via a bracket;

[0009] A push rod, movably arranged in the guide cylinder, and a pointer is arranged at one end of the push rod;

[0010] A protective plate is arranged on one side of the guide cylinder, and a pointer through hole matching with the pointer is opened on the protective plate;

[0011] A spring is arranged between the push rod and the guide cylinder, and the spring can push the push rod to make the pointer move to a side away from the protective plate.

[0012] Optionally, the bottom plate is in the shape of a flat plate, and a plurality of long waist holes are opened on the bottom plate.

[0013] Optionally, the base plate is connected to the top surface of the chassis assembly tire of the assembly platform through a plurality of the long waist holes and bolt assemblies.

[0014] Optionally, a pad is provided between the bottom plate and the top surface of the underframe assembly tire.

[0015] Optionally, the bracket includes two vertical plates, the two vertical plates are arranged in parallel on the upper side of the bottom plate, the protective plate is connected to one end of the two vertical plates, and the guide cylinder is arranged between the two vertical plates.

[0016] Optionally, the pointer includes a columnar portion and a conical portion, one end of the columnar portion is provided with a first threaded hole, the first threaded hole is connected to the first external thread of the one end of the push rod, and the conical portion is provided at the other end of the columnar portion.

[0017] Optionally, a front guide cover and a rear guide cover are respectively provided at both ends of the guide cylinder, the front guide cover and the rear guide cover are annular, the inner diameters of the front guide cover and the rear guide cover are smaller than the inner diameter of the guide cylinder, one end of the spring is connected to the front guide cover, and the other end of the spring is connected to the spring seat on the outer periphery of the push rod.

[0018] Optionally, the rear guide cover is connected to the guide cylinder via threads, and the spring seat interferes with the rear guide cover.

[0019] Optionally, center lines of the front guide cover, the rear guide cover and the pointer through hole are collinear.

[0020] Optionally, a grip groove is provided on the outer periphery of the other end of the push rod.

[0021] The present invention provides a centering indicator device for assembling a center beam and a side beam of a railway vehicle, which has the following beneficial effects:

[0022] 1. The device is provided with a bottom plate connected to the assembly platform, and a push rod and a pointer that can be extended and retracted in the guide tube are provided above the bottom plate. By adjusting the installation position of the bottom plate, the center line of the pointer is conveniently made to coincide with the transverse center line of the underframe assembly tire and the pointer is made to align with the ideal center point pre-marked on the web of the middle beam or side beam, thereby improving the assembly accuracy of the middle beam or side beam during assembly;

[0023] 2. The device is provided with a long waist hole on the bottom plate, which facilitates the adjustment of the installation position during installation so that the center line of the pointer coincides with the transverse center line of the chassis assembly tire, and the height of the pointer can be conveniently adjusted by adjusting the thickness of the pad so that the tip of the pointer points to the intersection (ideal center point) of the vertical center line, transverse center line, and longitudinal center line pre-marked on the web of the center beam or side beam on the outer surface of the web;

[0024] 3. The device can adjust the pointer height by adding or subtracting the thickness of the pad between the bottom plate and the chassis assembly tire, so that the center point of the pointer is aligned with the center point of the web at the intersection of the vertical center line and the transverse center line of the web of the middle beam or side beam. If the long beams are prefabricated and have deflection or deformation due to welding, the vertical center line drawn when the long beams are cut is not vertical. By longitudinally moving the transverse or vertical center point of the middle beam or side beam on the chassis assembly tire, the center point of the pointer of the device is aligned with the center point of the intersection of the vertical center line and the transverse center line of the web of the middle beam or side beam, the accuracy of the overlap of the transverse or vertical center of the middle beam or side beam with the transverse center space on the chassis assembly tire during the assembly of the railway vehicle chassis is improved, and the design problem that the center line drawn by the existing centering marking device on the long and large components is not parallel to the original center line and cannot be corrected is solved;

[0025] 4. The device has a protective plate and a telescopic push rod, so that the pointer can be retracted to the inside of the protective plate when not in operation, thus protecting the pointer and avoiding damage to the pointer;

[0026] 5. The telescopic push rod of the device drives the pointer to move, so that the device can maintain a certain safe distance from the middle beam or side beam when in use, and does not need to be set close to the middle beam or side beam, and does not affect the lifting and leaving of the chassis from the chassis assembly tire after the middle beam and side beam are assembled;

[0027] 6. The device has a simple structure, low cost, and is easy and labor-saving to operate.

[0028] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0030] Figure 1 A schematic diagram of the main structure of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention in a non-working state is shown.

[0031] Figure 2 A schematic diagram of the structure of a centering indicator device for assembling a center beam and side beam of a railway vehicle in a non-working state is shown according to an embodiment of the present invention.

[0032] Figure 3 A schematic side structural diagram of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown in a non-working state.

[0033] Figure 4 A schematic diagram of the main structure of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown in a working state.

[0034] Figure 5 A schematic diagram of the structure of a centering indicator device for assembling a center beam and side beam of a railway vehicle in a top view in a working state according to an embodiment of the present invention is shown.

[0035] Figure 6 A schematic structural diagram of a bottom plate of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0036] Figure 7 A schematic structural diagram of a protective plate of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0037] Figure 8 A schematic structural diagram of a vertical plate of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0038] Fig. 9 A schematic structural diagram of a push rod of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0039] Fig.10 A schematic structural diagram of a rear guide cover of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0040] Fig.11A schematic structural diagram of a spring seat of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0041] Fig.12 A structural schematic diagram of a guide cylinder of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0042] Fig.13 A schematic structural diagram of a front guide cover of a centering indicator device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0043] Fig.14 A schematic structural diagram of a pointer of a centering indicating device for assembling a center beam and side beam of a railway vehicle according to an embodiment of the present invention is shown.

[0044] Fig.15 A schematic diagram of the main structure of a side beam for a railway vehicle according to an embodiment of the present invention is shown.

[0045] Fig.16 A side structural schematic diagram of a side beam for a railway vehicle according to an embodiment of the present invention is shown.

[0046] Description of reference numerals:

[0047] 1. Bottom plate; 2. Protective plate; 3. Vertical plate; 4. Push rod; 5. Rear guide cover; 6. Spring seat; 7. Spring; 8. Guide cylinder; 9. Front guide cover; 10. Pointer; 11. Side beam; 12. Assembly platform; 13. Pad; 14. Vertical center line; 15. Horizontal center line; 16. Longitudinal center line. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0049] The present invention provides a centering indicating device for assembling a center beam and a side beam of a railway vehicle, comprising:

[0050] A base plate, used for connecting with the assembly platform;

[0051] A guide cylinder is connected to the base plate through a bracket;

[0052] A push rod is movably arranged in the guide cylinder, and a pointer is arranged at one end of the push rod;

[0053] A protective plate is arranged on one side of the guide cylinder, and a pointer through hole matching with the pointer is opened on the protective plate;

[0054] A spring is arranged between the push rod and the guide cylinder, and the spring can push the push rod to make the pointer move to a side away from the protective plate.

[0055] Specifically, the base plate is used to fix the device on the assembly platform. The installation position of the device can be determined according to the markings on the assembly platform. The installation height of the device can be adjusted by adding a pad. After fixing the device, the push rod is pushed to overcome the spring force so that the pointer on the push rod extends from the pointer hole. The position of the center beam or side beam is adjusted according to the direction of the pointer and the pre-marked center line on the center beam or side beam to be assembled, so that the assembly accuracy of the center beam or side beam is higher. After the adjustment, you only need to release the push rod, and the spring will automatically retract the pointer to the back side of the protective plate to protect the pointer and avoid accidental scratching of the pointer, which may cause the pointer to deform and lose the accuracy of the center indication.

[0056] In one example, the guide cylinder is cylindrical and made of a steel pipe, and the push rod is a cylindrical rod.

[0057] Optionally, the bottom plate is in the shape of a flat plate, and a plurality of long waist holes are opened on the bottom plate.

[0058] Specifically, the bottom plate is made of steel plate and mainly plays a supporting and connecting role. Four long waist holes for bolt connection are arranged along the length direction of the chassis assembly tire to facilitate longitudinal adjustment of the device during assembly, so that the center line of the pointer of the device coincides with the center of the chassis assembly tire.

[0059] Optionally, the bottom plate is connected to the top surface of the underframe assembly tire of the assembly platform through a plurality of long waist holes and bolt assemblies.

[0060] Specifically, a threaded hole matching the long waist hole is arranged on the top surface of the chassis assembly tire.

[0061] Optionally, a pad is provided between the bottom plate and the top surface of the underframe assembly tire.

[0062] Specifically, the pad is made of steel plates of different thicknesses and can have a variety of thicknesses. It mainly serves to adjust the height of the device. To facilitate connection, four connecting bolt holes are correspondingly arranged thereon. To facilitate adjustment, pads of different numbers and thicknesses can be used in combination.

[0063] Optionally, the bracket includes two vertical plates, the two vertical plates are arranged in parallel on the upper side of the bottom plate, the protective plate is connected to one end of the two vertical plates, and the guide tube is arranged between the two vertical plates.

[0064] Specifically, the vertical plates are made of steel plates, and two vertical plates are arranged on both sides of the guide cylinder head. The guide cylinder is fixedly assembled and welded to the bottom plate and the protective plate. At the same time, the vertical plates serve to connect the reinforcing ribs and protective steel pipes and pointers and other parts.

[0065] Optionally, the pointer includes a columnar portion and a conical portion, a first threaded hole is provided at one end of the columnar portion, the first threaded hole is connected to a first external thread at one end of the push rod, and the conical portion is provided at the other end of the columnar portion.

[0066] Specifically, the outer diameter of the cylindrical part is equal to the outer diameter of the push rod and the two are coaxial. By pushing the push rod, the pointer can be driven to pass through the pointer hole, and the conical part is used to contact the middle beam or the side beam to achieve the indication function of aligning the center of the middle and side beams.

[0067] Optionally, a front guide cover and a rear guide cover are respectively provided at both ends of the guide cylinder, the front guide cover and the rear guide cover are annular, the inner diameters of the front guide cover and the rear guide cover are smaller than the inner diameter of the guide cylinder, one end of the spring is connected to the front guide cover, and the other end of the spring is connected to the spring seat on the outer periphery of the push rod.

[0068] Specifically, the front guide cover can be welded to the guide cylinder, and the rear guide cover can be detachably connected to the guide cylinder, so as to facilitate the disassembly and replacement of the push rod and the pointer.

[0069] Furthermore, the outer diameter of the push rod matches the inner diameter of the front guide cover and the rear guide cover, which guides the push rod and ensures the accuracy of indication.

[0070] Optionally, the rear guide cover is connected to the guide cylinder via threads, and the spring seat interferes with the rear guide cover.

[0071] Specifically, the spring seat is welded on the push rod, and the interference between the spring seat and the rear guide cover can limit the push rod and keep the push rod in the guide cylinder.

[0072] Optionally, center lines of the front guide cover, the rear guide cover and the pointer through hole are collinear.

[0073] Specifically, the center lines of the front guide cover, the rear guide cover and the pointer through hole are collinear, and when the push rod is pushed, the push rod drives the pointer to move in a straight line along its center line to point to the center of the middle beam or the side beam.

[0074] Optionally, a grip groove is provided on the outer circumference of the other end of the push rod.

[0075] Specifically, the hand grip groove is a groove on the push rod that is sunken from the outside to the inside, which facilitates holding the push rod to prevent slipping when pushing the push rod.

[0076] Example

[0077] like Figures 1 to 16 As shown, the present invention provides a centering indicator device for assembling a center beam and a side beam of a railway vehicle, comprising:

[0078] A bottom plate 1, used for connecting with an assembly platform 12;

[0079] The guide cylinder 8 is connected to the base plate 1 through a bracket;

[0080] A push rod 4 is movably arranged in the guide cylinder 8, and a pointer 10 is arranged at one end of the push rod 4;

[0081] The protection plate 2 is arranged on one side of the guide cylinder 8, and a pointer 10 through hole matching with the pointer 10 is opened on the protection plate 2;

[0082] The spring 7 is arranged between the push rod 4 and the guide cylinder 8. The spring 7 can push the push rod 4 to make the pointer 10 move to the side away from the protective plate 2.

[0083] In this embodiment, the bottom plate 1 is in the shape of a flat plate, and a plurality of long waist holes are formed on the bottom plate 1 .

[0084] In this embodiment, the bottom plate 1 is connected to the top surface of the underframe assembly tire of the assembly platform 12 through a plurality of long waist holes and bolt assemblies.

[0085] In this embodiment, a backing plate 13 is provided between the bottom plate 1 and the top surface of the underframe assembly tire.

[0086] In this embodiment, the bracket includes two vertical plates 3 , which are arranged in parallel on the upper side of the bottom plate 1 , the protection plate 2 is connected to one end of the two vertical plates, and the guide tube 8 is arranged between the two vertical plates 3 .

[0087] In this embodiment, the pointer 10 includes a columnar portion and a conical portion. A first threaded hole is provided at one end of the columnar portion, the first threaded hole is connected to a first external thread at one end of the push rod 4, and the conical portion is provided at the other end of the columnar portion.

[0088] In this embodiment, a front guide cover 9 and a rear guide cover 5 are respectively provided at both ends of the guide cylinder 8, the front guide cover 9 and the rear guide cover 5 are annular, the inner diameters of the front guide cover 9 and the rear guide cover 5 are smaller than the inner diameter of the guide cylinder 8, one end of the spring 7 is connected to the front guide cover 9, and the other end of the spring 7 is connected to the spring 7 seat 6 on the outer periphery of the push rod 4.

[0089] In this embodiment, the rear guide cover 5 is connected to the guide cylinder 8 by threads, and the spring 7 seat 6 interferes with the rear guide cover 5 .

[0090] In this embodiment, the center lines of the front guide cover 9, the rear guide cover 5 and the through hole of the pointer 10 are collinear.

[0091] In this embodiment, a grip groove is provided on the outer circumference of the other end of the push rod 4 .

[0092] In summary, when the centering indicating device for assembling the side beam 11 of the center beam of a railway vehicle provided by the present invention is used, the assembly of the side beam 11 is taken as an example: the device is adjusted into place, that is, the four longitudinal long waist holes of the bottom plate 1 are used to adjust and move the bottom plate 1 longitudinally, so that the longitudinal center line 16 of the tip of the pointer 10 on the bottom plate 1 coincides with the transverse center line 15 on the chassis assembly tire, and the height of the longitudinal center line 16 of the tip of the pointer 10 is adjusted by adding the thickness or number of the adjustment pad 13 between the bottom plate 1 and the chassis assembly tire, so that when the tip of the pointer 10 is in the working state and extended, the center of its tip is exactly at the intersection (ideal center point) of the alternative vertical center line 14, transverse center line 15, and longitudinal center line 16 pre-marked on the web of the side beam on the outer surface of the web. This point is not affected by the deflection or welding deformation of the side beam, and is the center point closest to the ideal center (replacing the vertical and transverse center intersection of the side beam). The center line and center point at the web of the side beam can be marked on one side or on both sides depending on the specific situation.

[0093] Due to the same processes such as cutting and welding accessories for the center beam and the side beam during mass production, it can be considered that the lateral bending or welding deformation rules are the same, and the intersection point (ideal center point) of the vertical center line 14, the transverse center line 15 and the longitudinal center line 16 of the center beam and the side beam at the web on the outer surface of the web is close to the overall center of the center beam or the side beam and has a symmetrical structure, so the lateral bending or welding deformation is the least. It can be considered that the intersection point (ideal center point) at the outer surface of the web is close to the actual center point, which can be determined by drawing a line.

[0094] When the device is used, first, the side beam with the center line marked at the center of the web is hoisted onto the assembly tire and pressed against its transverse positioning block, then the handle part at the end of the push rod 4 of the device is pushed by hand, so that the push rod 4 drives the spring 7 seat 6 fixed thereon to move forward, and the spring 7 seat 6 drives the compression spring 7 to move forward, and at the same time, the push rod 4 drives the pointer 10 connected to its front section to extend forward and touch the side beam web (i.e., the working position), and measure the longitudinal distance between the center of the tip of the pointer 10 and the ideal center point of the middle beam or the side beam web, and then release the hand, and the push rod 4 pushes the spring 7 seat 6 under the restoring force of the compression spring 7, drives the push rod 4 and the pointer 10 connected to the head of the push rod 4 to retract the protective seat (i.e., the non-working position), and then moves the side beam longitudinally according to the measured value, and repeats the above steps until the center of the tip of the extended pointer 10 coincides with the ideal center point of the side beam web, and finally manipulates the transverse and vertical clamping devices on the assembly tire to tighten the middle beam or side beam without moving, thereby ensuring its accurate position.

[0095] When assembling the device, the front guide cover 9 is welded on the guide cylinder 8, and the spring 7 is first inserted into the guide cylinder 8. After the end of the pointer 10 is threadedly connected to the head of the push rod 4, the push rod 4 is inserted into the inner circle of the spring 7 in the guide cylinder 8 and the inner hole of the front guide cover 9. After the rear guide cover 5 is screwed in and tightened, the front part of the spring 7 contacts the inner side of the front guide cover 9, and the rear part of the spring 7 contacts the inner side of the spring 7 seat 6 welded on the push rod 4. At this time, there is a gap between the spring 7 seat 6 on the push rod 4 and the rear guide cover 5. In order to ensure that the push rod 4 has enough travel when pushing out, the rear guide cover 5 mainly prevents the push rod 4 from coming out and guides. When the pointer 10 of the device is partially disassembled, the rear guide cover 5 is rotated in the opposite direction to disassemble it, and then the push rod 4 and the spring 7 are pulled out, and then the pointer 10 and the push rod 4 are rotated in the opposite direction to separate them. After processing or replacing the pointer 10, assemble them according to the assembly sequence.

[0096] In order to cooperate with the connection and adjustment functions of the bottom plate 1 of the device, a corresponding number of bolt connection holes must be drilled at corresponding positions on the bottom frame assembly tire.

[0097] The device has a simple structure, is safe and reliable, has anti-collision and center position adjustment functions, and is suitable for promotion and application on tire assembly of chassis of various types of railway vehicles.

[0098] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A centering indicator device for assembling a center beam and a side beam of a railway vehicle, characterized in that: The device includes: The bottom plate is used to connect with the assembly platform, and the installation position of the device can be determined according to the markings on the assembly platform, and the installation height of the device can be adjusted by adding a pad; A guide cylinder connected to the base plate via a bracket; A push rod, movably arranged in the guide cylinder, and a pointer is arranged at one end of the push rod; A protective plate is arranged on one side of the guide cylinder, and a pointer through hole matching with the pointer is opened on the protective plate; a spring, wherein the spring is disposed between the push rod and the guide cylinder, and the spring can push the push rod so that the pointer moves to a side away from the protective plate; Push the push rod to overcome the spring force, so that the pointer on the push rod extends from the pointer hole. The position of the center beam or side beam is adjusted according to the direction of the pointer and the pre-marked center line on the center beam or side beam to be assembled, so that the assembly accuracy of the center beam or side beam is higher; release the push rod, the spring automatically retracts the pointer to the back side of the protective plate to protect the pointer.

2. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: The bottom plate is in the shape of a flat plate and is provided with a plurality of long waist holes.

3. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 2, characterized in that: The bottom plate is connected to the top surface of the underframe assembly tire of the assembly platform through a plurality of the long waist holes and bolt assemblies.

4. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: A pad is arranged between the bottom plate and the top surface of the underframe assembly tire.

5. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: The bracket includes two vertical plates, the two vertical plates are arranged in parallel on the upper side of the bottom plate, the protective plate is connected to one end of the two vertical plates, and the guide cylinder is arranged between the two vertical plates.

6. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: The pointer includes a columnar portion and a conical portion, one end of the columnar portion is provided with a first threaded hole, the first threaded hole is connected to the first external thread of the one end of the push rod, and the conical portion is provided at the other end of the columnar portion.

7. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: A front guide cover and a rear guide cover are respectively provided at both ends of the guide cylinder, the front guide cover and the rear guide cover are annular, the inner diameters of the front guide cover and the rear guide cover are smaller than the inner diameter of the guide cylinder, one end of the spring is connected to the front guide cover, and the other end of the spring is connected to the spring seat on the outer periphery of the push rod.

8. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 7, characterized in that: The rear guide cover is connected to the guide cylinder through threads, and the spring seat interferes with the rear guide cover.

9. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 7, characterized in that: The center lines of the front guide cover, the rear guide cover and the pointer through hole are collinear.

10. The centering indicator device for assembling the center beam and side beam of a railway vehicle according to claim 1, characterized in that: A hand grip groove is arranged on the outer periphery of the other end of the push rod.

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