CN219521062U

CN219521062U - Rail train top cover welding tool

Info

Publication number: CN219521062U
Application number: CN202223437755.7U
Authority: CN
Inventors: 蒋玉平; 席伟明; 唐亚红; 杨卫林; 梁艺蓝; 周富斌; 彭建明
Original assignee: Nanning CRRC Aluminum Precision Processing Co Ltd
Current assignee: Nanning CRRC Aluminum Precision Processing Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-08-15
Anticipated expiration: 2032-12-21

Abstract

The utility model belongs to the technical field of rail car machining tools and discloses a rail train top cover welding tool, which comprises two parallel longitudinal bottom edge beams, a plurality of mutually symmetrical left compression assemblies and right compression assemblies which are respectively and fixedly arranged on the two parallel longitudinal bottom edge beams at intervals, a transverse supporting beam which is arranged between the two parallel longitudinal bottom edge beams at intervals, two ends of the transverse supporting beam are respectively arranged on the inner side wall of the longitudinal bottom edge beams in a longitudinal sliding way, one or a plurality of transversely slidable forward supporting assemblies are arranged on the transverse supporting beam, and a reverse compression rod is arranged between the mutually symmetrical forward and reverse compression assemblies. The utility model discloses a welding frock can adapt to the positive and negative switching of top cap work piece and carry out quick installation location, also can in time adjust frock parameter in order to adapt to top cap welding deformation, effectively improves the production efficiency of top cap assembly welding process.

Description

Rail train top cover welding tool

Technical Field

The utility model belongs to the technical field of rail car machining tools, and particularly relates to a rail train top cover welding tool.

Background

Along with the development of society, lean production is promoted in the society in recent years, the automatic welding proportion of products is required to be improved, the labor intensity is reduced, the labor cost is saved, the workshop operation environment is improved, and the improvement of the equipment utilization rate and the production efficiency is continuously pursued. At present, the top cover of a rail train is welded on the front side and the back side of the top cover, but in the past, two sets of tools for respectively welding the front side and the back side of the top cover are needed to be equipped when top cover workpieces are welded, so that the welding tools are more in investment, more welding sites are occupied, the manufacturing cost is high, the production efficiency is low, the functions of the welding tools are single, the front side and the back side of the welding tools cannot be switched back and forth, the welding tools cannot be simultaneously applied to the product welding of different welding projects, the top cover workpieces are sometimes deformed in the welding process, the welding outline or the size is difficult to ensure to meet the design requirement, the production progress requirement is influenced, and the top cover welding tools with high universality are required to be designed so as to adapt to the situation of front side and back side switching of the welding process, and the welded top cover welding tools are ensured to meet the design requirement.

Disclosure of Invention

The utility model aims to provide a rail train top cover welding tool, which can adapt to forward and reverse switching of a top cover workpiece and perform quick installation and positioning, and can also timely adjust tool parameters to adapt to top cover welding deformation, so that the production efficiency of a top cover assembly welding procedure is effectively improved. In order to achieve the above purpose, the present utility model adopts the following technical scheme:

according to one aspect of the utility model, a welding fixture for a top cover of a rail train is provided, the welding fixture comprises two parallel longitudinal bottom edge beams, a plurality of mutually symmetrical left pressing assemblies and right pressing assemblies are respectively and fixedly arranged on the two parallel longitudinal bottom edge beams at intervals, a transverse supporting beam is arranged between the two parallel longitudinal bottom edge beams at intervals, two ends of the transverse supporting beam are respectively and longitudinally arranged on the inner side wall of the longitudinal bottom edge beams in a sliding manner, one or more transversely slidable forward supporting assemblies are arranged on the transverse supporting beam, and a reverse pressing rod is arranged between the mutually symmetrical forward and reverse pressing assemblies.

The above scheme is further preferable, the left compacting component comprises a left supporting column, a left transverse supporting plate, a left compacting rod, a left compacting head and a left supporting seat, the lower end of the left supporting column is fixed on the longitudinal bottom edge beam, one end of the left transverse supporting plate is rotationally connected to the top end of the left supporting column through a left limiting sleeve, a vertical bolt of the left compacting rod is connected to the other end of the left transverse supporting plate in a penetrating way, the left compacting head is arranged at the lower end of the left compacting rod, the left supporting seat close to one side of the right compacting component is arranged above the longitudinal bottom edge beam and close to the lower end of the left supporting column, one end of the left supporting seat is fixed on the side wall of the left supporting column, the other end of the left supporting seat is provided with a left lower supporting clamping block, the upper part between the left lower supporting clamping block and the left supporting column is horizontally fixed with an upper left supporting plate, the end of the upper left supporting plate close to one side of the right compacting component is provided with a left movable supporting clamping block in a sliding way, the upper left supporting plate close to one side of the left supporting column is provided with a pair of longitudinally parallel fixed adjusting plates, the left adjusting plates are arranged on the upper adjusting plates and are respectively provided with adjusting screws which are movably connected with the adjusting screws at two sides;

the right compacting assembly comprises a right supporting column, a right transverse supporting plate, a right compacting rod, a right compacting head and a right supporting seat, wherein the lower end of the right supporting column is fixed on a longitudinal bottom edge beam, one end of the right transverse supporting plate is rotationally connected to the top end of the right supporting column through a right limiting sleeve, a vertical bolt of the right compacting rod is connected to the other end of the right transverse supporting plate in a penetrating mode, the right compacting head is arranged at the lower end of the right compacting rod, the right supporting seat close to one side of the left supporting seat is arranged above the longitudinal bottom edge beam and close to the lower end of the right supporting column, one end of the right supporting seat is fixed on the side wall of the right supporting column, a right lower supporting clamping block is arranged at the other end of the right supporting seat, and an upper left supporting block is horizontally fixed above the right lower supporting clamping block and the right supporting column.

The above scheme is further preferable that an edge pressing assembly is arranged on the left transverse supporting plate between the right limiting sleeve and the left pressing rod and close to the left pressing rod end.

The above-mentioned scheme is further preferred, the edge is sticiss the subassembly and is sticiss support section of thick bamboo, edge are sticiss pressure pole and edge and are sticiss the briquetting, the vertical through connection of edge is sticiss support section of thick bamboo and is in left horizontal backup pad, is sticiss the top of support section of thick bamboo and is had the diameter and be greater than the limit section of thick bamboo head that the edge sticiss support section of thick bamboo outer wall, the edge is sticiss the pressure pole and is worn out the lower extreme in the support section of thick bamboo along the downthehole screw thread cup joint mode of limit section of thick bamboo head, sets up at the lower extreme of edge is sticiss the briquetting, the top of edge sticiss pressure pole have with limit fixing head of limit section of thick bamboo head inner wall screw thread matching connection.

The above scheme is further preferable that the upper surface of the left movable supporting clamping block, the upper surface of the left lower supporting clamping groove block and the upper surface of the right lower supporting clamping block are respectively provided with a through head clamping groove extending along the longitudinal direction. Above-mentioned scheme is further preferred, is provided with the backup pad of placing along longitudinal direction in forward support assembly's below, forward support assembly is including being fixed in the forward support subassembly on the transverse support beam and vertical setting just can be along longitudinal bottom edge beam extending direction pivoted forward bracing piece on the forward support subassembly, is provided with fixation nut on forward bracing piece top, has the ejector pin of upwards vertical extension at fixation nut internal thread connection, is provided with the support crew cut on the top of ejector pin. The above scheme is further preferred, forward support subassembly includes forward supporting baseplate, spacing fixed plate and spacing fixed plate, forward supporting baseplate slidable sets up cross bracing beam is provided with fixed stay piece at the one side edge of forward supporting baseplate, transversely runs through on fixed stay piece and is provided with the pivot, is connected with vertical parallel engaging lug at the both ends of pivot, is connected with fixed connection board on the other tip of engaging lug, the lower extreme of forward bracing piece is vertical to be connected on fixed connection board, is provided with the baffle fixed plate that a pair of cross bracing beam below was buckled on the forward supporting baseplate at pivot both ends, just is located the both ends surface of fixed connection board and is connected with the spacing fixed plate that a pair of cross bracing beam below was buckled between a pair of baffle fixed plate, and the lower extreme of forward bracing piece is located between a pair of spacing fixed plate, is provided with the bolt between the downward one end of buckling of a pair of spacing fixed plate and a pair of baffle fixed plate.

It is further preferable that the height of the forward support assembly is gradually reduced from both ends of the cross support beam toward the center. The above solution is further preferable that the forward support assemblies at both ends of the cross support beam have the same height, and are higher than the forward support assemblies provided at the center of the cross support beam, and the forward support assemblies provided at both ends of the cross support beam toward the center have the same height.

In summary, the utility model adopts the technical scheme, and has the following technical effects:

(1) The welding tool disclosed by the utility model can be quickly installed on the tool after being suitable for forward and reverse switching of the top cover workpieces, so that the forward and reverse switching of various top cover workpieces is realized for welding; the constraint on the top cover workpiece product can be realized, and the overall space size requirements of the top cover such as the outer width, the profile degree, the inner height and the like are met; the welding tool can also ensure that the internal height of the top cover is stable within a qualified range, effectively improve the production efficiency of the top cover assembly welding process, and ensure that the tool can effectively restrict the top cover from deforming in the welding process.

(2) The utility model discloses a welding frock can in time adjust frock parameter in order to adapt the top cap welding deformation according to the requirement of top cap outer width, interior height etc. has improved the production efficiency of top cap assembly welding process, reduces welding man-hour cost, has improved welding product quality.

Drawings

FIG. 1 is a schematic perspective view of a rail train top cover welding fixture of the present utility model;

FIG. 2 is a schematic diagram of the front view structure of a rail train top cover welding fixture of the present utility model;

FIG. 3 is a schematic top view of a rail train top cover welding fixture of the present utility model;

FIG. 4 is a schematic side view of a rail train top cover welding fixture of the present utility model;

FIG. 5 is a schematic view of the left compression assembly of the present utility model in partial construction;

FIG. 6 is a schematic perspective view of the forward locating installation of the overcap of the present utility model;

FIG. 7 is a side elevational schematic view of the forward positioning installation of the overcap of the present utility model;

FIG. 8 is a schematic perspective view of the reverse orientation installation of the top cover of the present utility model;

FIG. 9 is a schematic side view of the reverse orientation installation of the overcap of the present utility model;

FIG. 10 is a schematic illustration of the positioning of the left and right compression assemblies of the present utility model;

FIG. 11 is a schematic perspective view of a forward support assembly of the present utility model;

FIG. 12 is a side schematic view of the forward support assembly of the present utility model;

in the drawing, a longitudinal bottom edge beam 1, a left pressing assembly 2, a right pressing assembly 3, a transverse supporting beam 4, a forward supporting assembly 5, a reverse pressing rod 6, an edge pressing assembly 7, a forward supporting seat assembly 50 for placing supporting plates 8, a forward supporting rod 51, a fixing nut 52, a push rod 53, a supporting flat head 54, a left supporting upright 201, a left transverse supporting plate 202, a left pressing rod 203, a left pressing head 204, a left supporting seat 205, a left lower supporting clamping block 206, a left upper supporting plate 207, a left movable supporting clamping block 208, a fixed adjusting plate 209, an adjusting screw 210, a fastening adjusting nut 211, a right supporting upright 301, a right transverse supporting plate 302, a right limiting sleeve 302a, a right pressing rod 303, a right pressing head 304, a right supporting seat 305, a right lower supporting clamping block 306, a left upper supporting block 307, a forward supporting bottom plate 501, a fixed supporting block 502, a rotating shaft 503, a connecting lug 504, a fixed connecting plate 505, a limiting fixing plate 506, a limiting fixing plate 507, a plug 508, an edge pressing supporting cylinder 702, an edge pressing rod 703, an edge pressing block 703, a limiting cylinder head 704, a limiting fixing head 705.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the utility model, and that these aspects of the utility model may be practiced without these specific details.

As shown in fig. 1, 2 and 3, the welding fixture for the top cover of the rail train provided by the utility model comprises two parallel longitudinal bottom beams 1, a plurality of mutually symmetrical left pressing assemblies 2 and right pressing assemblies 3 respectively and fixedly arranged on the two parallel longitudinal bottom beams 1 at intervals, a transverse supporting beam 4 which spans between the two parallel longitudinal bottom beams 1 at intervals, two ends of the transverse supporting beam 4 are respectively arranged on the inner side walls of the longitudinal bottom beams 1 in a longitudinally sliding manner, one or more transversely slidable forward supporting assemblies 5 are arranged on the transverse supporting beam 4, and a transverse pressing rod 6 is arranged between the mutually symmetrical forward and backward pressing assemblies 2; at the time of forward welding, the top cap 100 is forward placed on the left and right compressing assemblies 2 and 3, and the inside of the top cap is supported by the forward supporting assembly 5.

In the embodiment of the present utility model, as shown in fig. 1, 2 and 3, the height of the forward support assembly 5 gradually decreases from two ends of the transverse support beam 4 to the center so as to adapt to the requirements of different top cover inner heights.

In the embodiment of the present utility model, as shown in fig. 1, 2 and 3, the heights of the forward supporting components 5 at the two ends of the transverse supporting beam 4 are the same and higher than the heights of the forward supporting components 5 arranged at the center of the transverse supporting beam 4, and the heights of the forward supporting components 5 arranged at the two ends of the transverse supporting beam 4 towards the center are the same, and the forward supporting components 5 in the embodiment adapt to the top cover workpiece based on internal high flatness and uniformity and are used for supporting the inner wall on which the top cover is placed forward.

In the utility model, as shown in fig. 1, 4, 5, 6 and 7, the left compressing assembly 2 comprises a left supporting column 201, a left transverse supporting plate 202, a left compressing rod 203, a left compressing head 204 and a left supporting seat 205, wherein the lower end of the left supporting column 201 is fixed on the longitudinal bottom beam 1, one end of the left transverse supporting plate 202 is rotationally connected to the top end of the left supporting column 201 through a left limiting sleeve 202a, the left compressing rod 203 is vertically and bolt-connected to the other end of the left transverse supporting column 202, the left compressing head 204 is arranged at the lower end of the left compressing rod 204, a left supporting seat 205 close to one side of the left compressing assembly 3 is arranged at the lower end of the left supporting column 201 above the longitudinal bottom beam 1, one end of the left supporting seat 205 is fixed on the side wall of the left supporting column 201, a left lower supporting fixture 206 is arranged at the other end of the left supporting seat 205, an upper left supporting plate 207 is horizontally fixed above the left lower supporting fixture 206 and the left supporting column 201, the upper end of the left supporting plate 207 close to one side of the left compressing assembly 3 is vertically and vertically connected to an adjusting screw rod 209 is arranged at one side of the left supporting plate 209, and the left supporting plate is movably connected to the left supporting seat is arranged at the two sides of the left supporting seat, and the left supporting seat is movably connected to the left supporting seat is movably and the left supporting seat is provided with an adjusting screw rod 209; the right compacting assembly 3 comprises a right supporting column 301, a right transverse supporting plate 302, a right compacting rod 303, a right compacting head 304 and a right supporting seat 305, wherein the lower end of the right supporting column 301 is fixed on the longitudinal bottom edge beam 1, one end of the right transverse supporting plate 302 is rotationally connected with the top end of the right supporting column 301 through a right limiting sleeve 302a, the right compacting rod 303 is vertically and bolt-through connected with the other end of the right transverse supporting plate 302, the right compacting head 304 is arranged at the lower end of the right compacting rod 304, a right supporting seat 305 close to one side of the left supporting seat 205 is arranged above the longitudinal bottom edge beam 1 and near the lower end of the right supporting column 301, one end of the right supporting seat 305 is fixed on the side wall of the right supporting column 301, a right lower supporting clamping block 306 is arranged at the other end of the right supporting seat 305, an upper left supporting block 307 is horizontally fixed above the position between the lower right supporting clamping block 306 and the right supporting upright post 301, two ends of the reverse tightening pressure rod 6 are detachably lapped on the lower left supporting clamping block 206 and the lower right supporting clamping block 306 respectively, a reverse positioning rod 60 is vertically arranged in the center of the reverse tightening pressure rod 6, the reverse tightening pressure rod 6 is a telescopic rod, threads are arranged at two ends of the reverse tightening pressure rod 6, the middle of the rotary reverse tightening pressure rod 6 can be lengthened or shortened, the rotary reverse tightening pressure rod 6 can be used for controlling the width of a product, the rotary reverse positioning rod 60 is rotated, the rotary reverse positioning rod 60 can be tightly pressed on the inner wall of the top cover 100 or downwards extends through the top cover 100 to be connected on the transverse supporting beam 4, and an edge tightening assembly 7 is arranged on the left transverse supporting plate 202 between the limiting sleeve 202a and the left tightening pressure rod 203 and close to the end of the left tightening pressure rod 203; in the present utility model, the edge pressing assembly 7 includes an edge pressing support cylinder 701, an edge pressing rod 702 and an edge pressing block 703, the edge pressing support cylinder 701 is vertically connected to the left transverse support plate 202 in a penetrating manner, a limit cylinder head 704 with a diameter larger than that of the outer wall of the edge pressing support cylinder 701 is provided at the top end of the edge pressing support cylinder 701, the edge pressing rod 702 penetrates out of the lower end of the edge pressing support cylinder 701 in a downwards threaded sleeving manner along the limit cylinder head 704, the edge pressing block 703 is provided at the lower end of the edge pressing rod 702, and a limit fixing head 705 in threaded matching connection with the inner wall of the limit cylinder head 704 is provided at the top end of the edge pressing rod 702. When the top cover is welded in the forward direction, the height of the forward direction supporting component 5 is adjusted to adapt to the internal height parameter when the top cover 100 is placed in the forward direction, then the two side edges of the top cover 100 are respectively placed in the through head clamping grooves of the left lower supporting clamping groove block 206 and the right lower supporting clamping block 306, the forward direction supporting component 5 is tightly contacted with the inner wall of the top cover 100, then the left transverse supporting plate 202 and the right transverse supporting plate 302 are respectively rotated to be in a vertical state above the top cover edge, then the left pressing rod 203 and the right pressing rod 303 are screwed and adjusted to vertically move downwards to be close to the back edge of the top cover 10, the left pressing head 204 and the right pressing head 304 are respectively pressed close to the back outline of the top cover 10, and then the left pressing head and the right pressing head are further fixed through the edge pressing component 7; when welding with respect to the width of the transverse dimension of different top covers, the adjusting screw 210 can be screwed and the left movable supporting clamping block 208 is pushed to transversely slide on the left upper supporting plate 207, after the positions of the left movable supporting clamping block 208 and the left upper supporting block 307 are adjusted, the adjusting screw 210 is fixed on the left upper supporting plate 207 through fastening the adjusting nut 211, then the top cover 100 can be placed on the left movable supporting clamping block 208 and the left upper supporting block 307, and the back surface of the fixed top cover 100 is tightly pressed through the edge pressing rod 702 of the edge pressing assembly 7, the left pressing rod 203 and the right pressing rod 303.

In the utility model, a placement support plate 8 along the longitudinal direction is arranged below a forward support assembly 5, the forward support assembly 5 comprises a forward support seat assembly 50 fixed on a transverse support beam 4 and a forward support rod 51 vertically arranged on the forward support seat assembly 50 and capable of rotating along the extending direction of a longitudinal bottom edge beam 1, a fixed nut 52 is arranged at the top end of the forward support rod 51, a push rod 53 which vertically extends upwards is connected with the fixed nut 52 in a threaded manner, a support flat head 54 is arranged at the top end of the push rod 53, when the top cover 100 is welded in the forward direction, the push rod 53 rotates in the fixed nut 52, and the height of the support flat head 54 is supported by the push rod 53 so as to adapt to the support with the inner wall of the top cover 100; when the top cover 100 is welded reversely, as shown in fig. 4, 8, 9 and 10, the forward support rod 51 is pushed to rotate towards the side where the support plate 8 is to be placed, the forward support rod 51 is placed on the support plate 8 to prevent the forward support assembly 5 from being propped against the inner wall of the top cover, then the back surface of the top cover 100 can be placed on the left lower support clamping groove block 206 and the right lower support clamping block 306, then the left transverse support plate 202 and the right transverse support plate 302 are respectively rotated to be in a vertical state above the back surface edge of the top cover, then the left compression rod 203 and the right compression rod 303 are screwed and adjusted to move vertically downwards to be close to the mouth edge of the top cover 100, and the left compression head 204 and the right compression head 304 are respectively compressed close to the outline of the mouth edge of the top cover 10, and then are further fixed through the edge compression assembly 7; and the adjusting screw 210 can be screwed and the left movable supporting clamping block 208 is pushed to transversely slide on the left upper supporting plate 207, so that the left movable supporting clamping block 208 extrudes the back surface of the top cover 100, after the positions of the left movable supporting clamping block 208 and the left upper supporting block 307 are adjusted, the adjusting screw 210 is fixed on the left upper supporting plate 207 through fastening the adjusting nut 211, then the inner wall of the top cover 100 is tightly pressed and fixed through the edge pressing rod 702 of the edge pressing assembly 7, the left pressing rod 203 and the right pressing rod 303 are adjusted, the reverse pressing rod 6 can be transversely supported on the inner walls on the left side and the right side of the top cover 100, and then the reverse positioning rod 60 downwards passes through the through holes on the top cover 100 and downwards extends to be connected on the transverse supporting beam 4, so that the top cover 100 is prevented from deforming in the welding process, and therefore, the welding deformation of a workpiece product is restrained, and the welded deformation of the workpiece product is quickly positioned, and the dimensional requirements after the product is welded are ensured to meet the design requirements.

In the present utility model, as shown in fig. 11 and 12, the forward support assembly 50 includes a forward support base 501, a limit fixing plate 506 and a limit fixing plate 507, the forward support base 501 is slidably disposed on the transverse support beam 4, a fixed support block 502 is disposed at one side edge of the forward support base 501, a rotation shaft 503 is transversely disposed through the fixed support block 502, two ends of the rotation shaft 503 are connected with longitudinally parallel connection lugs 504, the other ends of the connection lugs 504 are connected with a fixing connection plate 505, the lower ends of the forward support rods 51 are vertically connected with the fixing connection plate 505, a pair of limit fixing plates 506 bent under the transverse support beam 4 are disposed on the forward support base 501 at two ends of the rotation shaft 503, a pair of limit fixing plates 507 bent under the transverse support beam 4 are connected between the pair of limit fixing plates 506 and on two end surfaces of the fixing connection plate 505, and the lower ends of the forward support rods 51 are located between the pair of limiting fixing plates 507, a bolt 508 is provided between the pair of limiting fixing plates 507 and the downward bent ends of the pair of blocking fixing plates 506, when the top cover 100 is forward welded, as shown in fig. 4, 6, 7, 11 and 12, the forward support rods 51 are pushed to rotate along the rotating shafts 503 from the placement support plates 8 to the vertical position above the transverse support beams 4, then the forward support bottom plates 501 are pushed to slide on the transverse support beams 4, so that the positions of the whole forward support assemblies 5 on the transverse support beams 4 are adjusted, the fixing connection plates 505 and the limiting fixing plates 507 also rotate together with the forward support rods 51 in the process of pushing the forward support rods 51 to rotate, at the moment, the two ends of the fixing connection plates 505 are limited between the pair of blocking fixing plates 506 on the forward support bottom plates 501, and the pair of limiting and fixing plates 507 are limited between the pair of blocking and fixing plates 506, the limiting and fixing plates 507 and one end of the blocking and fixing plates 506, which is bent downwards, are connected together by the bolts 508, so that the forward support rod 51 is supported and limited on the forward support bottom plate 501, then the adjustable support flat head 54 is contacted with the inner wall of the top cover, and the adjustment and installation of the top cover 100 supported by the forward support assembly 50 are completed, so that the high support adjustment in the top covers 100 of different vehicle types is satisfied.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. A rail train top cap welding frock, its characterized in that: the welding fixture comprises two parallel longitudinal bottom edge beams, a plurality of mutually symmetrical left compression assemblies and right compression assemblies which are respectively and fixedly arranged on the two parallel longitudinal bottom edge beams at intervals, a transverse supporting beam which spans between the two parallel longitudinal bottom edge beams at intervals, two ends of the transverse supporting beam are respectively arranged on the inner side walls of the longitudinal bottom edge beams in a longitudinal sliding manner, one or more transversely slidable forward supporting assemblies are arranged on the transverse supporting beam, and a horizontal transverse compression rod is arranged between the mutually symmetrical forward and backward compression assemblies.

2. The rail train top cover welding fixture of claim 1, wherein: the left compacting assembly comprises a left supporting upright post, a left transverse supporting plate, a left compacting rod, a left compacting head and a left supporting seat, wherein the lower end of the left supporting upright post is fixed on the longitudinal bottom edge beam, one end of the left transverse supporting plate is rotationally connected to the top end of the left supporting upright post through a left limiting sleeve, a vertical bolt of the left compacting rod is connected to the other end of the left transverse supporting plate in a penetrating way, the left compacting head is arranged at the lower end of the left compacting rod, the left supporting seat close to one side of the right compacting assembly is arranged on the lower end of the left compacting head above the longitudinal bottom edge beam and close to the left supporting upright post, one end of the left supporting seat is fixed on the side wall of the left supporting upright post, the other end of the left supporting seat is provided with a left lower supporting clamping block, the upper left supporting plate is horizontally fixed on the upper side between the left lower supporting clamping block and the left supporting upright post, the upper end of the upper left supporting plate close to one side of the right supporting assembly is slidably provided with a left movable supporting block, the upper left supporting plate is arranged on the upper left supporting plate close to one side of the left supporting upright post, the left movable supporting plate is provided with a pair of longitudinally parallel fixed adjusting plates, the left adjusting plates are arranged on the left fixed adjusting plates, one pair of the fixed adjusting plates are respectively, one side adjusting screw rods are connected with the left movable adjusting screw rods, and the adjusting nuts are arranged on the two sides, and the adjusting screw rods are respectively arranged on the adjusting screw rods;

3. The rail train top cover welding fixture of claim 1, wherein: an edge compressing assembly is arranged on the left transverse supporting plate between the right limiting sleeve and the left compressing rod and close to the left compressing rod end.

4. A rail train top cap welding fixture according to claim 3, wherein: the edge pressing assembly comprises an edge pressing supporting cylinder, an edge pressing rod and an edge pressing block, the edge pressing supporting cylinder is vertically and penetratingly connected to the left transverse supporting plate, a limiting cylinder head with the diameter larger than that of the outer wall of the edge pressing supporting cylinder is arranged at the top end of the edge pressing supporting cylinder, the edge pressing rod penetrates out of the lower end of the edge pressing supporting cylinder in a downwards threaded sleeving manner in the limiting cylinder head, the edge pressing block is arranged at the lower end of the edge pressing rod, and a limiting fixing head in threaded matching connection with the inner wall of the limiting cylinder head is arranged at the top end of the edge pressing rod.

5. The rail train top cover welding fixture of claim 2, wherein: the upper surface of the left movable supporting clamping block, the upper surface of the left lower supporting clamping groove block and the upper surface of the right lower supporting clamping block are respectively provided with a through head clamping groove extending along the longitudinal direction.

6. The rail train top cover welding fixture of claim 1, wherein: the support plate is arranged below the forward support assembly along the longitudinal direction, the forward support assembly comprises a forward support assembly fixed on a transverse support beam and a forward support rod vertically arranged on the forward support assembly and capable of rotating along the extension direction of the longitudinal bottom edge beam, a fixing nut is arranged at the top end of the forward support rod, an ejector rod vertically extending upwards is connected with the inner thread of the fixing nut, and a support flat head is arranged at the top end of the ejector rod.

7. The rail train top cover welding fixture of claim 6, wherein: the forward support assembly comprises a forward support bottom plate, a limit fixing plate and a limit fixing plate, wherein the forward support bottom plate is slidably arranged on the transverse support beam, a fixed support block is arranged at one side edge of the forward support bottom plate, a rotating shaft transversely penetrates through the fixed support block, two ends of the rotating shaft are connected with connecting lugs longitudinally in parallel, the other ends of the connecting lugs are connected with a fixed connecting plate, the lower ends of the forward support rods are vertically connected to the fixed connecting plate, a pair of blocking fixing plates bent below the transverse support beam are arranged on the forward support bottom plate at two ends of the rotating shaft, a pair of limit fixing plates bent below the transverse support beam are connected between the pair of blocking fixing plates and are positioned on the surfaces of two ends of the fixed connecting plate, the lower ends of the forward support rods are positioned between the pair of limit fixing plates, and a bolt is arranged between the pair of limit fixing plates and one end of the downward bending of the pair of blocking fixing plates.

8. The rail train top cover welding fixture of claim 1, wherein: the height of the forward support assembly gradually decreases from the two ends of the transverse support beam to the center.

9. The rail train top cover welding fixture of claim 1, wherein: the height of the forward supporting components at the two ends of the transverse supporting beam is the same and higher than that of the forward supporting components arranged at the center of the transverse supporting beam, and the height of the forward supporting components arranged at the two ends of the transverse supporting beam towards the center is the same.