CN112092851B - Underframe synthesis positioning device and positioning method thereof - Google Patents
Underframe synthesis positioning device and positioning method thereof Download PDFInfo
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- CN112092851B CN112092851B CN202010902497.1A CN202010902497A CN112092851B CN 112092851 B CN112092851 B CN 112092851B CN 202010902497 A CN202010902497 A CN 202010902497A CN 112092851 B CN112092851 B CN 112092851B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
- B61D17/04—Construction details of vehicle bodies with bodies of metal; with composite, e.g. metal and wood body structures
- B61D17/10—Floors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
- B61F1/08—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
- B61F1/08—Details
- B61F1/10—End constructions
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Assembly (AREA)
Abstract
The invention discloses a chassis synthesis positioning device and a positioning method thereof, belonging to the technical field of high-speed rail vehicle manufacturing, wherein a double-layer motor train unit chassis comprises: two end chassis; two partition walls; a floor for connecting the two partition walls; and two edge beams for connecting the edge beams of the two end underframe; a transition connection structure for connecting the partition wall and the end underframe; one side of the transitional connection structure is fixedly connected with the end underframe in an inserting mode, and the other side of the transitional connection structure is fixedly connected with the partition wall in a lapping mode so as to enable the end underframe and the partition wall to be divided into blocks; the invention has the advantages of reducing the assembly difficulty of the underframe, shortening the manufacturing period of underframe synthesis and improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of high-speed rail vehicle manufacturing, in particular to a synthetic positioning device and a positioning method for a double-layer motor train unit underframe.
Background
At present, a double-layer motor train unit is a novel motor train unit developed for meeting the large passenger flow requirements of urban rail transit and main railways, and has the characteristics of large transportation capacity, high speed, safety, reliability and the like;
in the prior art, in order to meet the space requirement of a double-layer motor train unit, a chassis of the double-layer motor train unit adopts a horizontal design structure, and an end chassis, a partition wall and a horizontal floor are all in a splicing structure, as shown in the attached drawing 1, one end of the partition wall is inserted into the end chassis, and the other end of the partition wall is inserted into the floor, so that the assembly difficulty of the partition wall, the end chassis and the floor is high due to the wide width of a train body;
the original serial manufacturing process method and the original tool for the single-layer motor train unit plane type underframe with the revival number, the harmony number and the like are adopted to synthesize the double-layer motor train unit underframe, the synthesis and manufacturing period is long, the production efficiency is low, and the manufacturing requirements of the double-layer motor train unit underframe cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art:
the chassis synthesis positioning device and the positioning method thereof are provided, so that the overall dimensional requirement of the chassis is effectively ensured, the synthesis efficiency is high, the production efficiency is further improved, and the chassis synthesis positioning device has the beneficial effects of high welding seam quality, good forming effect and low labor intensity;
in order to achieve the above purpose, the invention provides the following technical scheme:
the invention discloses a chassis synthesis positioning device, which is used for synthesizing a double-layer motor train unit chassis, and the double-layer motor train unit chassis comprises:
two end chassis;
two partition walls;
a floor for connecting the two partition walls; and
two edge beams for connecting the two end chassis; also comprises
A transitional coupling structure for coupling the partition wall and the end chassis;
one side of the transitional connecting structure is fixedly connected with the end underframe in an inserting mode, and the other side of the transitional connecting structure is fixedly connected with the partition wall in a lapping mode, so that the end underframe and the partition wall can be divided into blocks;
the chassis combination positioning device comprises:
the device comprises a platform, a positioning device and a control device, wherein two supporting mechanisms, two assembling mechanisms, a plurality of supporting and clamping mechanisms and four positioning devices capable of forming a rectangle are arranged on the platform; and
the supporting and pressing mechanism is connected with the partition wall and the transition connection structure;
the supporting mechanism is provided with a clamp for fixing and pressing the end chassis and a first propelling device for driving the end chassis to move along the X axis;
the assembling mechanism is used for supporting the partition wall and the floor, and the surfaces of the assembling mechanism, which are in contact with the partition wall and the floor, are provided with third propelling devices for moving the partition wall and the floor;
the two ends of the supporting and clamping mechanism are symmetrically provided with chucks which can be opened or closed to form an annular structure and are used for circumferentially clamping the edge beam;
the top end of the positioning device is provided with a reference hole for aligning the positions of the double-layer motor train unit underframe in the length and width directions;
and the top of the supporting and pressing mechanism is detachably connected with a pressing plate assembly for pressing the partition wall and the transitional connection structure from the upper part.
Further, the transition connecting structure comprises a first connecting piece and two second connecting pieces;
one side of the first connecting piece is fixedly connected with the end underframe in an inserting manner;
one side of the second connecting piece is fixedly connected with the first connecting piece in an overlapping mode, and the other side of the second connecting piece is fixedly connected with the partition wall in an overlapping mode.
Further, the second connecting piece is a plate-shaped body with a long strip structure.
Further, the two sides of the platform along the length direction are symmetrically provided with slide ways;
the slideway is fixedly connected with the supporting mechanism, the assembling mechanism, the supporting and clamping mechanism, the positioning device and the supporting and pressing mechanism through bolt components;
a plurality of lifting rings are fixedly connected in the slide way through bolt assemblies and used for lifting the platform;
the supporting mechanisms are arranged at the two ends of the platform;
the supporting mechanism comprises a first supporting body and a plurality of second supporting bodies;
the first supporting body is lifted by an oil cylinder to form a bracket, and the bracket is used for supporting the end underframe;
the first propelling device used for pushing the end underframe towards the partition wall is distributed at the end, far away from the partition wall, of the first supporting body;
the second supporting bodies are distributed on the side, far away from the first propelling device, of the first supporting body;
the first supporting body and the second supporting body are both rotatably connected with the clamp;
and the first support body and the second support body are positioned on one side of the clamp and are both connected with a second propelling device for pushing the end underframe to displace along the Y-axis direction.
Further, the chuck is of a rectangular annular structure;
the top end of the chuck is detachably connected with a top plate for opening or closing the chuck;
ejector rods are arranged on the side wall of the chuck and on the top plate and used for clamping the boundary beam in the circumferential direction.
Furthermore, the top end of the positioning device is provided with a convex block;
the side part of the protruding block is provided with a first reference surface parallel to the longitudinal axis of the underframe and a second reference surface vertical to the longitudinal axis of the underframe;
wherein an intersection point at which the first reference plane and the second reference plane intersect perpendicularly coincides with the reference hole center.
Further, the pressure plate assembly comprises a pressure plate and an adjusting rod penetrating through the pressure plate;
the tail end of the adjusting rod is in threaded connection with the supporting and pressing mechanism through threads.
Furthermore, the top ends of the supporting and pressing mechanisms are sequentially provided with a first cushion block and a second cushion block;
and a plurality of gaskets provided with U-shaped openings are also arranged between the first cushion block and the second cushion block.
The invention discloses a positioning method for synthesizing a double-layer motor train unit underframe, which synthesizes the double-layer motor train unit underframe by using an underframe synthesis positioning device and comprises the following steps:
step A: firstly, adjusting the positions of four positioning devices according to the drawing requirements of a double-layer motor train unit underframe, so that a center line A in the length direction formed by the four positioning devices is used for being overlapped with an axis in the length direction of the double-layer motor train unit underframe, and a center line B in the width direction formed by the four positioning devices is used for aligning the position of an end underframe;
and B: assembling the end underframe and the edge beam;
placing two end underframe assemblies assembled by welding process on a support mechanism in an inverted manner, placing a side beam in a chuck of a support clamping mechanism in an inverted manner, reserving positioning holes symmetrically on two sides of the end underframe, and connecting two ends of the side beam with the end of the end underframe in an inserting manner;
step B1: driving a first propelling device on the supporting mechanism, and translating the end underframe along the X-axis direction to enable two positioning holes of the end underframe to coincide with a central line B formed by the positioning device;
step B2: driving a second propelling device on the supporting mechanism, and translating the end underframe along the Y-axis direction to ensure that the hole distance H between the positioning hole of the end underframe and the reference hole is matched with a drawing;
step B3: driving the clamp to press the end underframe;
step B4: the ejector rods on the driving chuck circumferentially clamp the edge beam;
step B5: after the end underframe and the edge beam are assembled, and the end underframe is fixedly connected through a welding process, a top plate at the top end of the chuck is opened, so that the upper part of the edge beam is exposed outside;
and C: assembling the floor and the partition wall;
the floor is inverted and falls above the supporting and clamping mechanism, the lower surfaces of two sides of the floor are connected with the upper surface of the edge beam in an inserting manner, two ends of the floor are connected with the end part of the partition wall in an inserting manner, and the end of the partition wall far away from the floor is contacted with the supporting and pressing mechanism;
step C1: after the floor and the partition wall fall into the assembly mechanism, a third propulsion device at the side part of the assembly mechanism is driven to adjust the installation angle of the partition wall, so that the partition wall is inserted into the floor;
step C2: after the floor and the partition wall are assembled, a third propulsion device in the vertical direction at the top end of the assembling mechanism is driven, so that the floor and the partition wall are lifted by 2-3mm in the Z-axis direction;
step D: assembling the transitional connection structure and the end underframe;
the first connecting piece of the transition connecting structure is connected with the end underframe in a plugging mode;
step D1: after the first connecting piece falls into the supporting and pressing mechanism, the first connecting piece is translated to enable the first connecting piece to be inserted into the end underframe, a plurality of pressing plate assemblies on the supporting and pressing mechanism are assembled, adjusting rods of the pressing plate assemblies are in threaded connection with the supporting and pressing mechanism, the adjusting rods are driven to drive the pressing plates to press the first connecting piece and the partition wall, and the partition wall and the first connecting piece are lowered by 2-3mm in the Z-axis direction;
step D2: after the first connecting piece and the end underframe are assembled, the floor and the boundary beam are fixedly connected through a welding process in sequence, the floor and the partition wall are fixedly connected through a welding process, and the end underframe and the first connecting piece are fixedly connected through a welding process;
step D3: removing the pressing plate assembly;
step D4: the second connecting piece of the transitional connecting structure is connected with the partition wall and the first connecting piece in an overlapping mode;
the partition wall and the second connecting piece at the bottom layer of the first connecting piece are positioned in place from the side part of the double-layer motor train unit underframe, and the partition wall and the second connecting piece at the top layer of the first connecting piece are positioned in place above the double-layer motor train unit underframe;
step D5: and the second connecting piece is fixedly connected with the partition wall and the first connecting piece through a welding process in sequence.
In the technical scheme, the double-layer motor train unit underframe, the underframe synthesis positioning device and the positioning method thereof
Has the advantages that:
1. according to the double-layer motor train unit underframe designed by the invention, the transitional connection structure is arranged between the end underframe and the partition wall, so that the modular design of the end underframe, the partition wall, the floor and the boundary beam is realized, the welding of all modules can be completed in parallel through an automatic welding machine, the situation that the underframe synthesis is completed through serial processes of sequential splicing is avoided, the manufacturing period of the double-layer motor train unit underframe synthesis is greatly shortened, the production efficiency is improved, and the modular design of the double-layer motor train unit underframe is beneficial to the universality and replaceability of modules of different types of vehicles;
secondly, the transitional connection structure comprises a first connecting piece and a second connecting piece, when the underframe is synthesized, the size change between the modules caused by the accumulation of manufacturing tolerance is eliminated by adjusting the width of the second connecting piece, meanwhile, the assembly difficulty is reduced, and the underframe synthesis efficiency is improved;
in addition, compared with the prior art, the transitional connection structure is arranged between the end underframe and the partition wall, the double-layer motor train unit underframe is in a modular design, the whole underframe is prevented from being manufactured, the operation length of external automatic welding equipment is reduced to 13M from the original 25M, the automatic welding tool is divided into the automatic welding tools with the original length of 25M into 13M and 6M, the equipment cost and field resources are reduced, the productivity of parts is greatly improved, in addition, the automatic welding is completed by replacing the traditional manual welding with one gun for bottoming and covering, the working efficiency is greatly improved, the quality and the forming of welding seams are improved, the labor intensity is reduced, meanwhile, the investment of a set of large underframe synthesis turnover tool is saved, the project cost is saved, and the occupied area of the field resources is reduced;
2. the invention discloses a chassis synthesis positioning device, which comprises a supporting mechanism, a pairing mechanism, a supporting clamping mechanism, a positioning device and a supporting and pressing mechanism;
the partition wall and the transitional connection structure of the double-layer motor train unit underframe are pre-connected through the supporting and pressing mechanism, so that the overall size of the underframe is ensured, the whole-train processing of the underframe is cancelled, and the manufacturing cost is greatly saved;
firstly, a third propulsion device is arranged on the surface, in contact with the floor and the partition wall, of the assembly mechanism, the angle adjustment of the assembly of the partition wall is realized by adjusting the third propulsion devices at different positions on the assembly mechanism, the assembly between the partition wall and the floor is convenient, the time is saved, the assembly efficiency of the underframe is improved, and in addition, the third propulsion devices in the vertical direction of the assembly mechanism are adjusted to be used for prefabricating welding reverse deformation and deflection, so that the welding quality is ensured;
secondly, a chuck is arranged at the top end of the supporting and clamping mechanism, the top end of the chuck is detachably connected with a top plate, ejector rods are arranged on the side wall of the chuck and the top plate, the chuck enables the chuck to form an annular structure capable of being opened or closed through the top plate to clamp the side beams, the curvature of a single side beam in the length direction and the width between the two side beams can be adjusted by rotating the ejector rods on the two sides of the chuck, the angle, the torsion resistance, the curvature and the inner width of the side beam are adjusted and positioned, the overall size and welding quality requirements of the chassis are further guaranteed, the production efficiency is improved, and the production cost is saved;
in addition, four positioning devices form four-point positioning, so that the positioning reference of the underframe can be conveniently aligned, reference holes and protruding blocks are distributed at the top ends of the positioning devices, and a first reference surface and a second reference surface are formed on the side parts of the protruding blocks; the intersection point of the first reference surface and the second reference surface which are vertically intersected is superposed with the center of the reference hole, and the reference position can be conveniently aligned by the first reference surface and the second reference surface when the positioning device is positioned, so that the debugging time is further saved, and the working efficiency is improved;
drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a partial cross-sectional view of a prior art double-decker multiple unit underframe assembled on a car body;
FIG. 2 is an isometric view of a double-layer motor train unit underframe assembled on a car body according to the present disclosure;
FIG. 3 is an isometric view of the double-layer motor train unit underframe after being turned 180 degrees;
FIG. 4 is a front view of FIG. 3;
FIG. 5 is a partial enlarged view of FIG. 4;
FIG. 6 is an isometric view of a undercarriage combination positioning apparatus of the present disclosure;
FIG. 7 is an axonometric view of a double-layer motor train unit underframe positioned on an underframe synthesis positioning device
FIG. 8 is an isometric view of the support mechanism disclosed herein;
FIG. 9 is a front view of FIG. 8;
FIG. 10 is an isometric view of the pairing mechanism disclosed herein;
FIG. 11 is a front view of the pairing mechanism of FIG. 10;
FIG. 12 is an isometric view of the support clamp mechanism of the present disclosure;
FIG. 13 is an isometric view of the positioning device of the present disclosure;
FIG. 14 is an isometric view of a support and compression mechanism of the present disclosure;
FIG. 15 is a front view of FIG. 14;
FIG. 16 is a schematic view of the gasket construction of FIG. 14;
FIG. 17 is a top view of the double-decker multiple unit underframe positioned on the underframe composite positioning device of the present disclosure;
fig. 18 is a partially enlarged view of fig. 17.
Description of reference numerals:
1. an end chassis; 2. a partition wall; 3. a floor; 4. a boundary beam; 5. an end draft sill; 6. a first connecting member; 7. a second connecting member;
100. a platform; 110. a slideway; 120. a hoisting ring;
200. a support mechanism; 210. a first support; 220. a second support; 230. an oil cylinder; 240. a bracket; 250. clamping; 251. a first shaft; 252. a second shaft; 260. a first propulsion device; 270. a second propulsion device;
300. a pairing mechanism; 310. a third propulsion device;
400. a support clamping mechanism; 410. a chuck; 420. a top plate; 430. a top rod;
500. a positioning device; 510. a reference hole; 520. a first reference plane; 530. a second reference plane;
600. a supporting and pressing mechanism; 610. pressing a plate; 620. adjusting a rod; 630. a first cushion block; 640. a second cushion block; 650. and (7) a gasket.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in FIGS. 1-5;
double-deck EMUs chassis includes:
two end chassis 1;
two partition walls 2;
a floor 3 for connecting the two partition walls 2; and
two edge beams 4 for connecting the two end chassis 1; also comprises
A transitional connection structure for connecting the partition wall 2 and the end underframe 1;
one side of the transitional connection structure is fixedly connected with the end underframe 1 in an inserting mode, and the other side of the transitional connection structure is fixedly connected with the partition wall 2 in an overlapping mode, so that the end underframe 1 and the partition wall 2 can be divided into blocks.
Specifically, as shown in fig. 1, in the structure, a transitional connection structure is added to the partition wall 2 and the end underframe 1, so that modularization of the end underframe 1, the partition wall 2, the floor 3 with a horizontal structure and the boundary beam 4 is realized, welding of all modules can be completed in parallel through an automatic welding machine, underframe synthesis through a serial process is avoided, the manufacturing period of the double-layer motor train unit underframe synthesis is greatly shortened, the production efficiency is improved, and the modularized design of the double-layer motor train unit underframe is beneficial to universality and replaceability among modules of different types of vehicles;
secondly, transitional connection structures are added on the partition wall 2 and the end underframe 1, when the underframe is synthesized, the size change between modules caused by manufacturing tolerance accumulation is eliminated by adjusting the width of the transitional connection structures, meanwhile, the assembly difficulty is reduced, and the integral flatness of the underframe and the integral size of the underframe are ensured;
preferably, the transitional connecting structure comprises a first connecting piece 6 and two second connecting pieces 7;
one side of the first connecting piece 6 is fixedly connected with the end underframe 1 in an inserting way;
the second connecting element 7 is fixedly connected to the first connecting element 6 in an overlapping manner on one side and to the partition wall 2 in an overlapping manner on the other side.
Preferably, the second connecting member 7 is a plate-shaped body having an elongated structure.
Specifically, as shown in fig. 5, the first connecting piece 6 is a section bar manufactured by rolling, extruding or casting and other processes in the prior art, the second connecting pieces 7 are connecting plates, when the underframe is synthesized, one side of the first connecting piece 6 is inserted into the end underframe 1, the two second connecting pieces 7 are distributed up and down and are sequentially connected with the first connecting piece 6 and the partition wall 2 in a lap joint manner, when the underframe is synthesized, the size change caused by the accumulation of manufacturing tolerances among modules is eliminated by adjusting the width of the second connecting pieces 7, the assembly difficulty is reduced, and the integral flatness of the underframe and the integral size of the underframe are ensured;
as shown in fig. 6;
the invention discloses a chassis synthesis positioning device, which is used for synthesizing a double-layer motor train unit chassis, and comprises:
the platform 100 is provided with two supporting mechanisms 200, two assembling mechanisms 300, a plurality of supporting and clamping mechanisms 400 and four positioning devices 500 which can form a rectangle; and
a supporting and pressing mechanism 600 connecting the partition wall 2 and the transitional connection structure;
a supporting mechanism 200 provided with a clamp 250 for fixing the pressing end chassis 1 and a first propelling device 260 for driving the end chassis 1 to move along the X axis;
a fitting-up mechanism 300 for supporting the partition wall 2 and the floor 3, and surfaces of the fitting-up mechanism 300 in contact with the partition wall 2 and the floor 3 are each provided with a third urging device 310 for moving the partition wall 2 and the floor 3;
the supporting and clamping mechanism 400 is provided with two ends symmetrically provided with clamping heads 410 which can be opened or closed to form an annular structure and are used for circumferentially clamping the edge beam 4;
the positioning device 500 is provided with a reference hole 510 at the top end thereof and is used for aligning the positions of the double-layer motor train unit underframe in the length direction and the width direction;
a supporting pressing mechanism 600, the top of which is detachably connected with a pressing plate assembly, for pressing the partition wall 2 and the transitional connection structure from above.
Specifically, referring to fig. 6, the two ends of the platform 100 are symmetrically and fixedly connected with the supporting mechanism 200, the assembling mechanism 300 and the positioning device 500, and the supporting and clamping mechanisms 400 are distributed at intervals in the middle of the platform 100; when the underframe is paired, the four positioning devices 500 form a positioning reference of a rectangular structure;
the end part chassis 1 is lifted above the supporting mechanism 200 through an external equipment crane and falls onto the supporting mechanism 200, and a first propelling device 260 arranged at one end of the supporting mechanism 200 pushes the end part chassis 1 to translate and align along the X axis; the first propelling device 260 comprises a nut fixedly connected to the supporting mechanism 200 and a screw connected with the nut, the end chassis 1 is pushed to move along the X axis by rotating the screw, the first propelling device 260 can also be a hydraulic oil cylinder in the prior art, a piston rod of the hydraulic oil cylinder extends out to push the end chassis 1 to move along the X axis, clamps 250 are symmetrically arranged on two sides of the supporting mechanism 200, and the end chassis 1 is fixed by the clamps 250 after being aligned;
the floor 3 is lifted above the assembly mechanism 300 by an external equipment crane and falls onto the assembly mechanism 300, the partition walls 2 are inserted at two ends of the floor 3, the assembly mechanism 300 is contacted with the lower surfaces of the partition walls 2 and the floor 3 by a third propulsion device 310, the third propulsion device 310 comprises nuts fixedly connected to the assembly mechanism 300 and screws in threaded connection with the nuts, and referring to fig. 10 and 11, the positions of the floor 3 and the installation angle of the partition walls 2 are adjusted by the screws of the third propulsion devices 310 at different positions;
after the partition wall 2 falls onto the assembling mechanism 300, the end, far away from the floor 3, of the partition wall 2 is in contact with the supporting and pressing mechanism 600, one side of a first connecting piece 6 of the transitional connection structure is inserted into the end underframe 1, the other side of the first connecting piece 6 is in contact with the supporting and pressing mechanism 600, and the supporting and pressing mechanism 600 realizes the pre-connection of the partition wall 2 and the transitional connection structure through a pressing plate assembly;
see fig. 8 and 9;
preferably, the platform 100 is symmetrically provided with slideways 110 along both sides of the length direction;
the slideway 110 is fixedly connected with a supporting mechanism 200, an assembling mechanism 300, a supporting and clamping mechanism 400, a positioning device 500 and a supporting and pressing mechanism 600 through bolt components; specifically, the slideway 110 is of a T-shaped structure, and the slideway 110 is slidably connected with a bolt of the T-shaped structure; in the structure, the positions of the supporting mechanism 200, the assembling mechanism 300, the supporting and clamping mechanism 400, the positioning device 500 and the supporting and pressing mechanism 600 are conveniently adjusted by arranging the sliding part 110 on the platform 100, so that the use is convenient;
a plurality of lifting rings 120 are fixedly connected in the slide way 110 through bolt assemblies and are used for lifting the platform 100; to facilitate movement of the platform 100
The two ends of the platform 100 are provided with supporting mechanisms 200;
the support mechanism 200 includes a first support body 210 and a plurality of second support bodies 220;
the first supporting body 210 is lifted by an oil cylinder 230 to form a bracket 240, and the bracket is used for supporting an end underframe;
the end of the first supporting body 210 far away from the partition wall 2 is provided with a first propelling device 260 for propelling the end underframe 1 towards the partition wall 2;
the second supporting body 220 is distributed on the side of the first supporting body 210 far away from the first propelling device 260;
the first supporting body 210 and the second supporting body 220 are rotatably connected with a clamp 250;
wherein, the first supporting body 210 and the second supporting body 220 are connected with a second pushing device 270 at one side of the clamp 250, and are used for pushing the end chassis 1 to displace along the Y-axis direction. Specifically, as shown in fig. 8, a screw is installed at one end of the clamp 250, the end chassis 1 is clamped by rotating the screw, and a first shaft 251 and a second shaft 252 are installed at one end of the clamp 250; after the second shaft 252 is removed, the clamp 250 can rotate around the first shaft 251 to avoid interference with the clamp 250 when the end chassis 1 falls into the support mechanism 200, one side of the clamp 250 is connected with a second pushing device 270, the second pushing device 270 comprises a nut fixedly connected to the clamp 250 and a screw rod in threaded connection with the nut, and the structure can push the end chassis 1 to displace along the Y-axis direction by rotating the screw rod of the second pushing device 270;
as shown in fig. 12;
preferably, the collet 410 is a rectangular ring-shaped structure;
a top plate 420 is detachably attached to the top end of the cartridge 410 for opening or closing the cartridge 410;
the side wall of the clamp 410 and the top plate 420 are provided with a top rod 430 for circumferentially clamping the edge beam 4.
Specifically, the chuck 410 is in a U-shaped structure, two side walls of the U-shaped structure are both in threaded connection with ejector rods 430, the top end of the chuck 410 is detachably connected with a top plate 420 through a bolt assembly, the middle part of the top plate 420 is in threaded connection with the ejector rods 430, in the structure, the chuck 410 enables the chuck 410 to form an annular structure capable of being opened or closed to clamp the edge beam 4 through the top plate 420, and the curvature of the length direction of a single edge beam 4 and the width between two edge beams 4 can be adjusted by rotating the ejector rods 430 at two sides of the chuck 410;
as shown in fig. 13;
preferably, the top end of the positioning device 500 is provided with a convex block;
the side of the bump is formed with a first reference surface 520 parallel to the longitudinal axis of the chassis and a second reference surface 530 perpendicular to the longitudinal axis of the chassis;
wherein the intersection point where the first reference plane 520 and the second reference plane 530 perpendicularly intersect coincides with the center of the reference hole 510. The first reference surface 520 and the second reference surface 530 facilitate the alignment of the reference position when the positioning device 500 is positioned, thereby saving the debugging time and improving the working efficiency;
as shown in fig. 14;
preferably, the pressure plate assembly includes a pressure plate 610 and an adjustment rod 620 penetrating the pressure plate 610;
the end of the adjusting rod 620 is in threaded connection with the supporting and pressing mechanism 600 through threads. When in use, the pressure plate 610 is adjusted by rotating the adjusting rod 620 to clamp the partition wall 2 and the first connecting piece 6;
as shown in fig. 14; preferably, the top end of the supporting and pressing mechanism 600 is sequentially provided with a first cushion block 630 and a second cushion block 640; a plurality of gaskets 650 with U-shaped openings are arranged between the first cushion block 630 and the second cushion block 640. Specifically, as shown in fig. 16, a plurality of U-shaped openings are formed in one side of the gasket 650, and the U-shaped openings are used for avoiding the connecting bolts between the first cushion block 630 and the second cushion block 640, so that the overall height of the supporting and pressing mechanism 600 is convenient to adjust, in addition, the bottom wall of the chuck 410 of the supporting and clamping mechanism 400 can also adjust the distance between the bottom wall of the chuck 410 and the top plate 420 through the gasket 650 provided with the U-shaped openings, so that the chuck 410 can conveniently clamp the side beams 4 of different models, and the universality of the underframe synthesis positioning device is ensured;
see fig. 17-18;
the invention discloses a positioning method for synthesizing a double-layer motor train unit underframe, which synthesizes the double-layer motor train unit underframe by using an underframe synthesis positioning device and comprises the following steps:
step A: firstly, adjusting the positions of four positioning devices 500 according to the drawing requirements of the double-layer motor train unit underframe, so that a center line A in the length direction formed by the four positioning devices 500 is used for being overlapped with an axis in the length direction of the double-layer motor train unit underframe, and a center line B in the width direction formed by the four positioning devices 500 is used for aligning the position of an end underframe 1;
and B: assembling the end underframe 1 and the edge beam 4;
placing two end underframe 1 assembled by welding process on the supporting mechanism 200 in an inverted manner, placing the edge beam 4 in a chuck 410 of the supporting and clamping mechanism 400 in an inverted manner, reserving positioning holes symmetrically on two sides of the end underframe 1, and connecting two ends of the edge beam 4 with the end of the end underframe 1 in an inserting manner;
step B1: driving a first propelling device 260 on the supporting mechanism 200, and translating the end chassis 1 along the X-axis direction to enable two positioning holes of the end chassis 1 to coincide with a central line B formed by a positioning device 500;
step B2: driving a second propelling device 270 on the supporting mechanism 200, and translating the end underframe 1 along the Y-axis direction to enable the hole distance H between the positioning hole of the end underframe 1 and the reference hole 510 to be consistent with the drawing;
step B3: the driving clamp 250 presses the end chassis 1;
step B4: the ejector rod 430 on the driving chuck 410 circumferentially clamps the edge beam 4; specifically, the ejector rods 430 on the two sides of the driving chuck 410 are used for correcting the edge beam 4, so that the curvature of the edge beam 4 in the length direction meets the curvature requirement of the double-layer motor train unit underframe in the length direction;
step B5: after the end underframe 1 and the boundary beam 4 are completely assembled and fixedly connected with the end underframe 1 through a welding process, the top plate 420 at the top end of the chuck 410 is opened, so that the upper part of the boundary beam 4 is exposed outside;
and C: the floor 3 and the partition wall 2 are assembled;
the floor 3 falls into the upper part of the supporting and clamping mechanism 400 in an inverted manner, the lower surfaces of the two sides of the floor 3 are connected with the upper surface of the edge beam 4 in an inserted manner, the two ends of the floor 3 are connected with the end part of the partition wall 2 in an inserted manner, and the end of the partition wall 2 far away from the floor 3 is contacted with the supporting and pressing mechanism 600;
step C1: after the floor 3 and the partition wall 2 fall into the assembly mechanism 300, driving a third propulsion device 310 at the side of the assembly mechanism 300 to adjust the installation angle of the partition wall 2, so that the partition wall 2 is inserted into the floor 3;
step C2: after the floor 3 and the partition wall 2 are assembled, a third propulsion device 310 in the vertical direction at the top end of the assembling mechanism 300 is driven, so that the floor 3 and the partition wall 2 are lifted by 2-3mm in the Z-axis direction; the method is used for prefabricating welding reversible deformation and deflection (used for reserving welding deformation allowance);
step D: assembling the transitional connection structure and the end underframe 1;
the first connecting piece 6 of the transition connecting structure is connected with the end underframe 1 in a plugging mode;
step D1: after the first connecting piece 6 falls into the supporting and pressing mechanism 600, the first connecting piece 6 is translated to enable the first connecting piece 6 to be inserted into the end underframe 1, a plurality of pressing plate assemblies on the supporting and pressing mechanism 600 are assembled, an adjusting rod 620 of each pressing plate assembly is in threaded connection with the supporting and pressing mechanism 600, the adjusting rod 620 is driven to drive a pressing plate 610 to press the first connecting piece 6 and the partition wall 2 tightly, and the partition wall 2 and the first connecting piece 6 are enabled to descend by 2-3mm in the Z-axis direction;
step D2: after the first connecting piece 6 and the end underframe 1 are assembled, the floor 3 and the boundary beam 4 are fixedly connected through a welding process in sequence, the floor 3 and the partition wall 2 are fixedly connected through the welding process, and the end underframe 1 and the first connecting piece 6 are fixedly connected through the welding process;
step D3: removing the pressing plate assembly;
step D4: the second connecting piece 7 of the transitional connecting structure connects the partition wall 2 and the first connecting piece 6 in an overlapping manner;
the partition wall 2 and the second connecting piece 7 at the bottom layer of the first connecting piece 6 are positioned from the side part of the double-layer motor train unit underframe, and the partition wall 2 and the second connecting piece 7 at the top layer of the first connecting piece 6 are positioned above the double-layer motor train unit underframe;
step D5: the second connecting piece 7 is fixedly connected with the partition wall 2 and the second connecting piece 7 is fixedly connected with the first connecting piece 6 sequentially through a welding process.
Has the advantages that:
1. according to the double-layer motor train unit underframe designed by the invention, the transitional connection structure is arranged between the end underframe and the partition wall, so that the modular design of the end underframe, the partition wall, the floor and the boundary beam is realized, the welding of all modules can be completed in parallel through an automatic welding machine, the situation that the underframe synthesis is completed through serial processes of sequential splicing is avoided, the manufacturing period of the double-layer motor train unit underframe synthesis is greatly shortened, the production efficiency is improved, and the modular design of the double-layer motor train unit underframe is beneficial to the universality and replaceability of modules of different types of vehicles;
secondly, the transitional connection structure comprises a first connecting piece and a second connecting piece, when the underframe is synthesized, the size change between the modules caused by the accumulation of manufacturing tolerance is eliminated by adjusting the width of the second connecting piece, meanwhile, the assembly difficulty is reduced, and the underframe synthesis efficiency is improved;
in addition, compared with the prior art, the transitional connection structure is arranged between the end underframe and the partition wall, the double-layer motor train unit underframe is in a modular design, the whole underframe is prevented from being manufactured, the operation length of external automatic welding equipment is reduced to 13M from the original 25M, the automatic welding tool is divided into the automatic welding tools with the original length of 25M into 13M and 6M, the equipment cost and field resources are reduced, the productivity of parts is greatly improved, in addition, the automatic welding is completed by replacing the traditional manual welding with one gun for bottoming and covering, the working efficiency is greatly improved, the quality and the forming of welding seams are improved, the labor intensity is reduced, meanwhile, the investment of a set of large underframe synthesis turnover tool is saved, the project cost is saved, and the occupied area of the field resources is reduced;
2. the invention discloses a chassis synthesis positioning device, which comprises a supporting mechanism, a pairing mechanism, a supporting clamping mechanism, a positioning device and a supporting and pressing mechanism;
the partition wall and the transitional connection structure of the double-layer motor train unit underframe are pre-connected through the supporting and pressing mechanism, so that the overall size of the underframe is ensured, the whole-train processing of the underframe is cancelled, and the manufacturing cost is greatly saved;
firstly, a third propulsion device is arranged on the surface, in contact with the floor and the partition wall, of the assembly mechanism, the angle adjustment of the assembly of the partition wall is realized by adjusting the third propulsion devices at different positions on the assembly mechanism, the assembly between the partition wall and the floor is convenient, the time is saved, the assembly efficiency of the underframe is improved, and in addition, the third propulsion devices in the vertical direction of the assembly mechanism are adjusted to be used for prefabricating welding reverse deformation and deflection, so that the welding quality is ensured;
secondly, a chuck is arranged at the top end of the supporting and clamping mechanism, the top end of the chuck is detachably connected with a top plate, ejector rods are arranged on the side wall of the chuck and the top plate, the chuck enables the chuck to form an annular structure capable of being opened or closed through the top plate to clamp the side beams, the curvature of a single side beam in the length direction and the width between the two side beams can be adjusted by rotating the ejector rods on the two sides of the chuck, the angle, the torsion resistance, the curvature and the inner width of the side beam are adjusted and positioned, the overall size and welding quality requirements of the chassis are further guaranteed, the production efficiency is improved, and the production cost is saved;
in addition, four positioning devices form four-point positioning, so that the positioning reference of the underframe can be conveniently aligned, reference holes and protruding blocks are distributed at the top ends of the positioning devices, and a first reference surface and a second reference surface are formed on the side parts of the protruding blocks; the intersection point of the first reference surface and the second reference surface which are vertically intersected coincides with the center of the reference hole, and the reference position can be conveniently aligned by the first reference surface and the second reference surface when the positioning device is positioned, so that the debugging time is further saved, and the working efficiency is improved.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (9)
1. The chassis synthesis positioning device is used for synthesizing a double-layer motor train unit chassis, and the double-layer motor train unit chassis comprises: two end chassis (1);
two partition walls (2);
-a floor (3) for connecting two of said partitions (2); and
two edge beams (4) for connecting the two end chassis (1); also comprises
A transitional connection structure for connecting the partition wall (2) and the end chassis (1);
one side of the transitional connecting structure is fixedly connected with the end underframe (1) in a plugging way,
the other side is fixedly connected with the partition wall (2) in a lap joint mode so as to lead the end underframe (1) and the partition wall (2) to be capable of being divided into blocks;
it is characterized in that the underframe synthesis positioning device comprises:
the device comprises a platform (100), wherein two supporting mechanisms (200), two assembling mechanisms (300), a plurality of supporting and clamping mechanisms (400) and four positioning devices (500) capable of forming a rectangle are arranged on the platform (100); and
a supporting and pressing mechanism (600) connecting the partition wall (2) and the transition connection structure;
the supporting mechanism (200) is provided with a clamp (250) for fixing the pressing end chassis (1) and a first propelling device (260) for driving the end chassis (1) to move along the X axis;
the assembling mechanism (300) is used for supporting the partition wall (2) and the floor (3), and the surfaces of the assembling mechanism (300) in contact with the partition wall (2) and the floor (3) are provided with third propelling devices (310) for moving the partition wall (2) and the floor (3);
the two ends of the supporting and clamping mechanism (400) are symmetrically provided with clamping heads (410) which can be opened or closed to form an annular structure and are used for circumferentially clamping the edge beam (4);
the top end of the positioning device (500) is provided with a reference hole (510) for aligning the positions of the double-layer motor train unit underframe in the length and width directions;
and a supporting and pressing mechanism (600) with the top detachably connected with a pressing plate component for pressing the partition wall (2) and the transition connection structure from the upper part.
2. The undercarriage synthesizing and positioning apparatus of claim 1 wherein;
the transition connecting structure comprises a first connecting piece (6) and two second connecting pieces (7);
one side of the first connecting piece (6) is fixedly connected with the end underframe (1) in an inserting manner;
one side of the second connecting piece (7) is fixedly connected with the first connecting piece (6) in an overlapping mode, and the other side of the second connecting piece is fixedly connected with the partition wall (2) in an overlapping mode.
3. The chassis composite positioning apparatus of claim 2;
the second connecting piece (7) is a plate-shaped body with a long strip structure.
4. The undercarriage synthesizing and positioning apparatus of claim 1 wherein;
the platform (100) is symmetrically provided with slide ways (110) along two sides of the length direction;
the slide way (110) is fixedly connected with the supporting mechanism (200), the assembling mechanism (300), the supporting and clamping mechanism (400), the positioning device (500) and the supporting and pressing mechanism (600) through bolt assemblies;
a plurality of lifting rings (120) are fixedly connected in the slide way (110) through bolt assemblies and used for lifting the platform (100);
the supporting mechanisms (200) are arranged at the two ends of the platform (100);
the support mechanism (200) comprises a first support body (210) and a plurality of second support bodies (220);
a bracket (240) is lifted in the middle of the first supporting body (210) through an oil cylinder (230), and the bracket (240) is used for supporting the end underframe (1);
the end, far away from the partition wall (2), of the first support body (210) is provided with the first propelling device (260) used for pushing the end underframe (1) towards the partition wall (2);
the second support (220) is distributed on the side of the first support (210) away from the first propulsion device (260);
the first support body (210) and the second support body (220) are both rotatably connected with the clamp (250);
and the first support body (210) and the second support body (220) are positioned on one side of the clamp (250) and are both connected with a second pushing device (270) for pushing the end chassis (1) to displace along the Y-axis direction.
5. The undercarriage synthesizing and positioning apparatus of claim 1 wherein;
the chuck (410) is in a rectangular annular structure;
a top plate (420) is detachably connected to the top end of the clamping head (410) and used for opening or closing the clamping head (410);
and ejector rods (430) are arranged on the side wall of the clamping head (410) and the top plate (420) and are used for circumferentially clamping the edge beam (4).
6. The undercarriage synthesizing and positioning apparatus of claim 1 wherein;
the top end of the positioning device (500) is provided with a convex block;
the side of the protruding block is formed with a first reference surface (520) parallel to the longitudinal axis of the chassis and a second reference surface (530) perpendicular to the longitudinal axis of the chassis;
wherein an intersection point at which the first reference plane (520) and the second reference plane (530) perpendicularly intersect coincides with the center of the reference hole (510).
7. The undercarriage synthesizing and positioning apparatus of claim 1 wherein;
the pressure plate assembly comprises a pressure plate (610) and an adjusting rod (620) penetrating through the pressure plate (610);
the tail end of the adjusting rod (620) is in threaded connection with the supporting and pressing mechanism (600) through threads.
8. The chassis composite positioning apparatus of claim 7;
the top end of the supporting and pressing mechanism (600) is sequentially provided with a first cushion block (630) and a second cushion block (640);
a plurality of gaskets (650) provided with U-shaped openings are also arranged between the first cushion block (630) and the second cushion block (640).
9. The positioning method for synthesizing the underframe of the double-layer motor train unit is characterized in that the underframe synthesizing and positioning device of any one of claims 1 to 8 is used for synthesizing the underframe of the double-layer motor train unit, and comprises the following steps:
step A: firstly, adjusting the positions of four positioning devices (500) according to the drawing requirements of the double-layer motor train unit underframe, so that a center line A in the length direction formed by the four positioning devices (500) is superposed with an axis in the length direction of the double-layer motor train unit underframe, and a center line B in the width direction formed by the four positioning devices (500) is used for aligning the position of the end part underframe (1);
and B: assembling an end underframe (1) and a boundary beam (4);
placing two end underframe (1) assembled by welding process on a supporting mechanism (200) in an inverted manner, placing an edge beam (4) in a chuck (410) of a supporting and clamping mechanism (400) in an inverted manner, reserving positioning holes symmetrically on two sides of the end underframe (1), and connecting two ends of the edge beam (4) with the end of the end underframe (1) in an inserting manner;
step B1: driving a first propelling device (260) on the supporting mechanism (200), and enabling the end underframe (1) to translate along the X-axis direction to enable two positioning holes of the end underframe (1) to coincide with a central line B formed by the positioning device (500);
step B2: driving a second propelling device (270) on the supporting mechanism (200), and translating the end underframe (1) along the Y-axis direction to enable the hole distance H between the positioning hole of the end underframe (1) and the reference hole (510) to be matched with a drawing;
step B3: driving the clamp (250) to press the end underframe (1);
step B4: the ejector rod (430) on the driving chuck (410) circumferentially clamps the edge beam (4);
step B5: after the end underframe (1) and the boundary beam (4) are assembled, and the end underframe (1) is fixedly connected through a welding process, a top plate (420) at the top end of a chuck (410) is opened, so that the upper part of the boundary beam (4) is exposed outside;
and C: the floor (3) and the partition wall (2) are assembled in pairs;
the floor (3) falls into the upper part of the supporting and clamping mechanism (400) in an inverted mode, the lower surfaces of the two sides of the floor (3) are connected with the upper surface of the edge beam (4) in an inserting mode, the two ends of the floor (3) are connected with the end part of the partition wall (2) in an inserting mode, and the end, far away from the floor (3), of the partition wall (2) is contacted with the supporting and clamping mechanism (600);
step C1: after the floor (3) and the partition wall (2) fall into the assembling mechanism (300), driving a third propelling device (310) at the side part of the assembling mechanism (300) to adjust the installation angle of the partition wall (2), and enabling the partition wall (2) to be inserted into the floor (3);
step C2: after the floor (3) and the partition wall (2) are assembled, a third propulsion device (310) in the vertical direction of the top end of the assembling mechanism (300) is driven to lift the floor (3) and the partition wall (2) by 2-3mm in the Z-axis direction;
step D: the assembly transition connection structure and the end underframe (1) are arranged;
a first connecting piece (6) of the transition connecting structure is connected with the end underframe (1) in a plugging mode;
step D1: after the first connecting piece (6) falls into the supporting and pressing mechanism (600), the first connecting piece (6) is translated to enable the first connecting piece (6) to be inserted into the end underframe (1), a plurality of pressing plate assemblies on the supporting and pressing mechanism (600) are assembled, adjusting rods (620) of the pressing plate assemblies are in threaded connection with the supporting and pressing mechanism (600), the adjusting rods (620) are driven to drive the pressing plates (610) to press the first connecting piece (6) and the partition wall (2), and the partition wall (2) and the first connecting piece (6) are enabled to descend by 2-3mm in the Z-axis direction;
step D2: after the first connecting piece (6) and the end underframe (1) are assembled, the floor (3) and the boundary beam (4) are fixedly connected through a welding process in sequence, the floor (3) and the partition wall (2) are fixedly connected through the welding process, and the end underframe (1) and the first connecting piece (6) are fixedly connected through the welding process;
step D3: removing the pressing plate assembly;
step D4: a second connecting piece (7) of the transitional connecting structure is connected with the partition wall (2) and the first connecting piece (6) in an overlapping mode;
the partition wall (2) and the second connecting piece (7) at the bottom layer of the first connecting piece (6) are located in position from the side part of the double-layer motor train unit underframe, and the partition wall (2) and the second connecting piece (7) at the top layer of the first connecting piece (6) are located in position above the double-layer motor train unit underframe;
step D5: the second connecting piece (7) is fixedly connected with the partition wall (2) and the second connecting piece (7) is fixedly connected with the first connecting piece (6) sequentially through a welding process.
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| CN114179842B (en) * | 2021-12-03 | 2023-05-23 | 中车唐山机车车辆有限公司 | Double-deck chassis, automobile body and rail vehicle |
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| JPH1148967A (en) * | 1997-08-07 | 1999-02-23 | Hitachi Ltd | Rolling stock and manufacture thereof |
| CN107458501B (en) * | 2017-08-14 | 2019-04-23 | 中车唐山机车车辆有限公司 | Double-deck bus body assembly system and method |
| CN107790949B (en) * | 2017-12-11 | 2023-12-22 | 湖南联诚轨道装备有限公司 | Aerial rail train body welding tool and welding method thereof |
| CN208868050U (en) * | 2018-08-27 | 2019-05-17 | 中车青岛四方机车车辆股份有限公司 | A kind of fish-bellied type chassis |
| CN111361591B (en) * | 2018-12-25 | 2021-03-30 | 中车唐山机车车辆有限公司 | Double-deck rail vehicle and chassis thereof |
| CN110480153A (en) * | 2019-08-15 | 2019-11-22 | 青岛四方庞巴迪铁路运输设备有限公司 | Undercarriage frame welds auxiliary mould and its method |
| CN210822249U (en) * | 2019-11-12 | 2020-06-23 | 青岛四方庞巴迪铁路运输设备有限公司 | High-low floor connecting device of rail vehicle body |
| CN211166876U (en) * | 2019-12-16 | 2020-08-04 | 中车唐山机车车辆有限公司 | Transitional connection structure for connecting end underframe and middle underframe |
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