CN105788425B - Compartment simulator - Google Patents

Compartment simulator Download PDF

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Publication number
CN105788425B
CN105788425B CN201610130750.XA CN201610130750A CN105788425B CN 105788425 B CN105788425 B CN 105788425B CN 201610130750 A CN201610130750 A CN 201610130750A CN 105788425 B CN105788425 B CN 105788425B
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CN
China
Prior art keywords
carriage body
body frame
strip groove
plate
mounting plate
Prior art date
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Application number
CN201610130750.XA
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Chinese (zh)
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CN105788425A (en
Inventor
陈波
孙玉昆
侯方东
刘金林
焦京海
吴冬华
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CRRC Qingdao Sifang Co Ltd
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CRRC Qingdao Sifang Co Ltd
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Priority to CN201610130750.XA priority Critical patent/CN105788425B/en
Publication of CN105788425A publication Critical patent/CN105788425A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B25/00Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes

Abstract

The present invention provides a kind of compartment simulators, including:Bottom plate;First carriage body frame, the first carriage body rack position are adjustably disposed on bottom plate;Second carriage body frame, the second carriage body rack position are adjustably disposed on bottom plate;For connecting intercoil connection between first carriage body frame and the second carriage body frame.It is determining that compartment simulator in the present invention solves the problems, such as that the length of the gap bridge cable between the compartment end of vehicle in the prior art and installation site are not easy.

Description

Compartment simulator
Technical field
The present invention relates to vehicle simulation arts, in particular to a kind of compartment simulator.
Background technique
Currently, even being hung between the compartment and compartment of rail vehicle by hitch, there are also many height between the end in compartment Pressure connector, signal connector carry out even extension, are mainly used for the transmission of power supply and signal between compartment.
However, vehicle is running cross the bad working environments such as curve under, connector and gap bridge cable, which will appear, to be pullled, touches The situation hit and rubbed etc., and it is not easy to accurately determine the length of relatively reasonable gap bridge cable by calculating in the prior art, The mutually anti-degree when crossing curve between cable is also not easy to determine simultaneously, this makes equipment and connector cisco unity malfunction.
Summary of the invention
The main purpose of the present invention is to provide a kind of compartment simulators, to solve the compartment of vehicle in the prior art The length and installation site of gap bridge cable between end are not easy determining problem.
To achieve the goals above, the present invention provides a kind of compartment simulators, including:Bottom plate;First carriage body frame, the One carriage body rack position is adjustably disposed on bottom plate;Second carriage body frame, the second carriage body rack position are adjustably disposed in bottom plate On;For connecting intercoil connection between first carriage body frame and the second carriage body frame.
In the present embodiment, compartment simulator further includes:First loading plate, the first loading plate are hinge on the floor, the One loading plate is connect with the first carriage body frame, and the first carriage body frame is driven to move on bottom plate.
In the present embodiment, the first strip groove is provided on the first loading plate, the first strip groove is prolonged along the first loading plate Direction extension is stretched, the first carriage body frame movably plugs in the first slot along the extending direction of the first strip groove.
In the present embodiment, first connecting portion is set on the first carriage body frame, 3rd bearing is installed in first connecting portion, the Three bearings are located in the first strip groove.
In the present embodiment, compartment simulator further includes:Second loading plate, the second loading plate are hinge on the floor, the Two loading plates are connect with the second carriage body frame, and the second carriage body frame is driven to move on bottom plate.
In the present embodiment, the second strip groove is provided on the second loading plate, the second strip groove is prolonged along the second loading plate Direction extension is stretched, the second carriage body frame is movably plugged in the second strip groove along the extending direction of the second strip groove.
In the present embodiment, it is provided with second connecting portion on the second carriage body frame, fourth bearing is installed in second connecting portion, Fourth bearing is located in the second strip groove.
In the present embodiment, the first carriage body frame includes the first frame and the first mounting plate, and the first mounting plate is along the first frame Short transverse position-adjustable be arranged, intercoil connection is connected on the first mounting plate.
In the present embodiment, compartment simulator further includes the first connector holder, and the first connector holder is along the first mounting plate Extending direction position-adjustable be arranged, intercoil connection is connect by the first connector holder with the first mounting plate.
In the present embodiment, the second carriage body frame includes the second frame and the second mounting plate, and the second mounting plate is along the second frame Short transverse position-adjustable be arranged, intercoil connection is connected on the second mounting plate.
In the present embodiment, compartment simulator further includes the second connector holder, and the second connector holder is along the second mounting plate Extending direction position-adjustable be arranged, intercoil connection is connect by the second connector holder with the second mounting plate.
In the present embodiment, between the first carriage body frame and the second carriage body frame have more intercoil connections, the first of each intercoil connection Hold the height on the first carriage body frame identical, height of the second end of each intercoil connection on the second carriage body frame is identical.
Compartment simulator in the present invention includes bottom plate, the first carriage body frame and the second carriage body frame, due to the first carriage body frame It is arranged on bottom plate with the second equal position-adjustable of carriage body frame, and connects and pass a bridge between the first carriage body frame and the second carriage body frame Line.In this way, the first carriage body frame and the second carriage body frame are moved to analog position when the length to intercoil connection is simulated, examine Whether the length for looking into intercoil connection is pulled to no surplus or intercoil connection whether length is sagging beyond the mark under compression, and Whether mutually anti-phase is rubbed between two intercoil connections, and whether the length that can detect intercoil connection is reasonable, and then more easily determines The length of intercoil connection.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the main view of the embodiment of the compartment simulator according to the present invention;
Fig. 2 shows the top views of the compartment simulator according to the present invention;
Fig. 3 shows the side view of the compartment simulator according to the present invention;And
Fig. 4 shows the analog state figure of the compartment simulator in the present invention.
Wherein, above-mentioned attached drawing includes the following drawings label:
10, bottom plate;20, the first carriage body frame;21, the first frame;22, the first mounting plate;23, first connecting portion;30, second Carriage body frame;31, the second frame;32, the second mounting plate;33, second connecting portion;40, intercoil connection;50, the first loading plate;51, One strip groove;60, the second loading plate;61, the second strip groove;70, the first connector holder;80, the second connector holder;91, first Bearing;92, second bearing;93,3rd bearing;94, fourth bearing;100, dry run curve.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of compartment simulators, and please refer to figs. 1 to 4, which includes:Bottom plate 10;First carriage body frame 20 is arranged on bottom plate 10 to first carriage body frame, 20 position-adjustable;Second carriage body frame 30, the second carriage body It is arranged on bottom plate 10 to 30 position-adjustable of frame;For connecting intercoil connection between first carriage body frame 20 and the second carriage body frame 30 40。
Compartment simulator in the present invention includes bottom plate 10, the first carriage body frame 20 and the second carriage body frame 30, due to first It is arranged on bottom plate 10 to carriage body frame 20 and the equal position-adjustable of the second carriage body frame 30, and the first carriage body frame 20 and the second carriage body frame Intercoil connection 40 is connected between 30.In this way, when the length to intercoil connection 40 is simulated, by the first carriage body frame 20 and the second carriage body Frame 30 moves to analog position, checks whether the length of intercoil connection 40 is pulled to no surplus or intercoil connection 40 under compression Length is sagging, and whether mutually anti-phase is rubbed between beyond the mark and two intercoil connections 40, can detect the length of intercoil connection 40 Whether reasonable, and then more easily determine the length of intercoil connection 40 if spending.
In order to realize movement of the first carriage body frame 20 on bottom plate 10, compartment simulator further includes:First loading plate 50, First loading plate 50 is hinged on bottom plate 10, and the first loading plate 50 is connect with the first carriage body frame 20, and the first carriage body frame 20 is driven to exist It is moved on bottom plate 10.In this way, shifting of the first carriage body frame 20 on bottom plate 10 can be driven when rotating the first loading plate 50 It is dynamic.
In order to guarantee that the first loading plate 50 can rotate on bottom plate 10, the first loading plate 50 passes through first bearing 91 It is mounted on bottom plate 10.
In the present embodiment, as shown in Figure 1, Figure 2 and Figure 4, it is provided with the first strip groove 51 on the first loading plate 50, first Strip groove 51 extends along the extending direction of the first loading plate 50, and the first carriage body frame 20 is removable along the extending direction of the first strip groove 51 It is plugged in the first strip groove 51 dynamicly.
The present embodiment can expand the first carriage body frame 20 by the way that the first carriage body frame 20 to be plugged in the first strip groove 51 Motion range rotate the first carriage body frame 20 can not only around the hinge joint of the first loading plate 50, can also be along close to the hinge The direction of contact or the separate hinge joint is mobile.
In order to realize that the first carriage body frame 20 is plugged in the first strip groove 51, first connecting portion is set on the first carriage body frame 20 23,3rd bearing 93 is installed in first connecting portion 23,3rd bearing 93 is located in the first strip groove 51.
As shown in Figures 1 to 4, the first connecting portion 23 in the present embodiment is plugged in the first strip groove 51, due to first 3rd bearing 93 is installed, and the 3rd bearing 93 is located in the first strip groove 51 on interconnecting piece 23, in this way, the first carriage body frame 20 It can be rotated around 3rd bearing 93.
In order to realize movement of the second carriage body frame 30 on bottom plate 10, as shown in Figure 1, Figure 2 and Figure 4, compartment simulator Further include:Second loading plate 60, the second loading plate 60 are hinged on bottom plate 10, and the second loading plate 60 and the second carriage body frame 30 connect It connects, the second carriage body frame 30 is driven to move on bottom plate 10.In this way, the second compartment can be driven when rotating the second loading plate 60 Movement of the body frame 30 on bottom plate 10.
In order to make the second loading plate 60 can be to rotate on bottom plate 10, the second loading plate 60 be mounted on bottom by second bearing 92 On plate 10.
In the present embodiment, the second strip groove 61 is provided on the second loading plate 60, the second strip groove 61 is along the second carrying The extending direction of plate 60 extends, and the second carriage body frame 30 is movably plugged in the second bar shaped along the extending direction of the second strip groove 61 In slot 61.
The present embodiment can expand the second carriage body frame 30 by the way that the second carriage body frame 30 to be plugged in the second strip groove 61 Motion range rotate the second carriage body frame 30 can not only around the hinge joint of the second loading plate 60, can also be along close to the hinge The direction of contact or the separate hinge joint is mobile.
In order to realize that the second carriage body frame 30 is plugged in the second strip groove 61, the second connection is provided on the second carriage body frame 30 Portion 33 is equipped with fourth bearing 94 in second connecting portion 33, and fourth bearing 94 is located in the second strip groove 61.
Second connecting portion 33 in the present embodiment is plugged in the second strip groove 61, due to being equipped in second connecting portion 33 Fourth bearing 94, and the fourth bearing 94 is located in the second strip groove 61, in this way, the second carriage body frame 30 can be around fourth bearing 94 rotations.
In order to adjust the height of intercoil connection 40, the first carriage body frame 20 includes the first frame 21 and the first mounting plate 22, and first Mounting plate 22 along the first frame 21 short transverse position-adjustable be arranged, intercoil connection 40 is connected on the first mounting plate 22. In this way, can realize the adjusting to intercoil connection 40 by adjusting height of first mounting plate 22 on the first frame 21.
In the present embodiment, compartment simulator further includes the first connector holder 70, and the first connector holder 70 is along the first peace The extending direction position-adjustable of loading board 22 it is arranged, intercoil connection 40 is connected by the first connector holder 70 and the first mounting plate 22 It connects.
Preferably, the extending direction for extending perpendicularly to intercoil connection 40 of the first mounting plate 22.Preferably, the first carriage body Frame 20 includes multiple first mounting plates 22, in order to use when connector holder misplaces and simulates.Preferably, multiple first mounting plates 22 along the first frame 21 short transverse arranged for interval.
When mobile first connector holder 70 on the first mounting plate 22, intercoil connection 40 can be adjusted in the first mounting plate Position on 22.
In order to adjust the height of intercoil connection 40, the second carriage body frame 30 includes the second frame 31 and the second mounting plate 32, and second Mounting plate 32 along the second frame 31 short transverse position-adjustable be arranged, intercoil connection 40 is connected on the second mounting plate 32. In this way, can realize the adjusting to intercoil connection 40 by adjusting height of second mounting plate 32 on the second frame 31.
In the present embodiment, compartment simulator further includes the second connector holder 80, and the second connector holder 80 is along the second peace The extending direction position-adjustable of loading board 32 it is arranged, intercoil connection 40 is connected by the second connector holder 80 and the second mounting plate 32 It connects.
Preferably, the extending direction for extending perpendicularly to intercoil connection 40 of the second mounting plate 32.Preferably, the second carriage body Frame 30 includes multiple second mounting plates 32, in order to use when connector holder misplaces and simulates.Preferably, multiple second mounting plates 32 along the second frame 31 short transverse arranged for interval.
In the present embodiment, as shown in figure 4, having more intercoil connections between the first carriage body frame 20 and the second carriage body frame 30 40, height of the first end of each intercoil connection 40 on the first carriage body frame 20 is identical, and the second end of each intercoil connection 40 is in the second carriage body Height on frame 30 is identical.
The present embodiment is made each by making the identical as the height of one end of the first carriage body frame 20 connection of each intercoil connection 40 The height of one end of intercoil connection 40 connected with the first carriage body frame 20 is identical, can guarantee the height phase of each intercoil connection 40 Together.
Compartment simulator in the present embodiment is applied in railway vehicle end connector arrangement and gap bridge line length mould It is quasi-, in order to determine the reliability of connector installation site and the reasonability of gap bridge cable length, the main root in design in the past Simulation calculating is carried out according to vehicle running track, the length of connection is calculated by calculating minimum curve, in conjunction with design experiences early period The arrangement and length of progress select.
However, still have deviation by operation conditions after the result and actual installation that are calculated, thus design with The length of calculating is used to actually simulate by the device of rail vehicle end equal proportion, which can simulate vehicle Various routes state, gap bridge cable batch production when ensure correctness, avoid and cause huge waste.
The simple and reliable for structure of compartment simulator in the present embodiment, manual operation are strong, have controllability, and And the operating status of vehicle end connector under each curve circuit can be simulated.
A connector plug pair can be first made after calculating connector length according to disparity items, in the device On installed, in the longitudinal and transverse direction adjust connector position ensure it is identical with the position arranged in layout design. According to line condition rotate the bearing in loading plate and strip groove can simulating vehicle operation curve, when crossing curve, vehicle end is deposited It is drawing high and compressive state.
As shown in figure 4, there is the bearing slided in it in strip groove at this time, generally in simulation in addition to conventional mould It is quasi-, limit simulation can also be directly carried out, can check whether the length of intercoil connection 40 has been pulled to no surplus or right at this time Connector holder damages, at the same check intercoil connection 40 under compression length it is sagging whether be more than limit and this two Whether mutually anti-phase is rubbed between cable.Dry run curve 100 in Fig. 4 can indicate the emulation mode.
If by discovery after realistic simulation, there are problems, can change the length of intercoil connection in time, avoid large quantities of The waste of intercoil connection (gap bridge cable) is caused in amount production, whether the installation site that can also detect connector holder is reasonable, if Too close, gap bridge cable will mutually resist.
In order to ensure equipment and connector can work normally, need to guarantee in vehicle operation crossing the severe works such as curve Connector and situations such as pullling, collide and rub of gap bridge cable are avoided that under condition, in design it needs to be determined that connector The reasonability of installation site and cable length, so designing the railway vehicle end connector arrangement and gap bridge line length Simulator.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (6)

1. a kind of compartment simulator, which is characterized in that including:
Bottom plate (10);
First carriage body frame (20) is arranged on the bottom plate (10) to the first carriage body frame (20) position-adjustable;
Second carriage body frame (30) is arranged on the bottom plate (10) to the second carriage body frame (30) position-adjustable;
For connecting intercoil connection (40) between the first carriage body frame (20) and the second carriage body frame (30);
First loading plate (50), first loading plate (50) are hinged on the bottom plate (10), first loading plate (50) It is connect with the first carriage body frame (20), the first carriage body frame (20) is driven to move on the bottom plate (10);
Second loading plate (60), second loading plate (60) are hinged on the bottom plate (10), second loading plate (60) It is connect with the second carriage body frame (30), the second carriage body frame (30) is driven to move on the bottom plate (10);
It is provided with the first strip groove (51) on first loading plate (50), first strip groove (51) is along first carrying The extending direction of plate (50) extends, the first carriage body frame (20) along first strip groove (51) extending direction movably It is plugged in first strip groove (51);
First connecting portion (23) are set on the first carriage body frame (20), 3rd bearing is installed on the first connecting portion (23) (93), the 3rd bearing (93) is located in first strip groove (51);
It is provided with the second strip groove (61) on second loading plate (60), second strip groove (61) is along second carrying The extending direction of plate (60) extends, the second carriage body frame (30) along second strip groove (61) extending direction movably It is plugged in second strip groove (61);
It is provided with second connecting portion (33) on the second carriage body frame (30), the 4th axis is installed on the second connecting portion (33) It holds (94), the fourth bearing (94) is located in second strip groove (61).
2. compartment simulator according to claim 1, which is characterized in that the first carriage body frame (20) includes the first frame Frame (21) and the first mounting plate (22), first mounting plate (22) are adjustable along the short transverse position of first frame (21) Save land setting, and the intercoil connection (40) is connected on first mounting plate (22).
3. compartment simulator according to claim 2, which is characterized in that the compartment simulator further includes the first company Connect device seat (70), first connector holder (70) along first mounting plate (22) extending direction position-adjustable set It sets, the intercoil connection (40) is connect by first connector holder (70) with first mounting plate (22).
4. compartment simulator according to claim 1, which is characterized in that the second carriage body frame (30) includes the second frame Frame (31) and the second mounting plate (32), second mounting plate (32) are adjustable along the short transverse position of second frame (31) Save land setting, and the intercoil connection (40) is connected on second mounting plate (32).
5. according to claim go 4 described in compartment simulator, which is characterized in that the compartment simulator further includes second Connector holder (80), second connector holder (80) along second mounting plate (32) extending direction position-adjustable set It sets, the intercoil connection (40) is connect by second connector holder (80) with second mounting plate (32).
6. compartment simulator according to claim 1, which is characterized in that the first carriage body frame (20) and described second There are the more intercoil connections (40), the first end of each intercoil connection (40) is in the first carriage body frame between carriage body frame (30) (20) height on is identical, and height of the second end of each intercoil connection (40) on the second carriage body frame (30) is identical.
CN201610130750.XA 2016-03-08 2016-03-08 Compartment simulator Active CN105788425B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610130750.XA CN105788425B (en) 2016-03-08 2016-03-08 Compartment simulator

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Application Number Priority Date Filing Date Title
CN201610130750.XA CN105788425B (en) 2016-03-08 2016-03-08 Compartment simulator

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CN105788425B true CN105788425B (en) 2018-11-27

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Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7836749B2 (en) * 2006-08-09 2010-11-23 Ford Motor Company Sled buck testing system
DE102010019836B4 (en) * 2010-05-08 2015-11-26 Audi Ag airbag test
CN102128723A (en) * 2010-12-20 2011-07-20 哈尔滨工业大学 Vehicle end relation comprehensive test stand
CN102226743B (en) * 2011-04-12 2012-10-10 吉林大学 Rail vehicle vehicle terminal relation integration testing stand
CN103018034A (en) * 2012-12-25 2013-04-03 青岛四方车辆研究所有限公司 Car coupler coupling test bed
CN203310640U (en) * 2013-06-05 2013-11-27 北京铁道工程机电技术研究所有限公司 Ground coupler positioning device and system for locomotive testing bed
CN103439123B (en) * 2013-08-07 2016-08-17 长春轨道客车股份有限公司 A kind of device for measuring railway vehicle end relation
CN203838897U (en) * 2014-04-24 2014-09-17 湖南八方轨道交通仿真设备有限公司 Rail transit vehicle structure and maintenance training device
CN104934798B (en) * 2015-03-17 2017-04-05 中车青岛四方机车车辆股份有限公司 Car end interactive mode intercoil connection transferring box
CN205027595U (en) * 2015-07-27 2016-02-10 南车青岛四方机车车辆股份有限公司 Rail vehicle car holds cable relation of passing a bridge to verify and fatigue test device
CN204807408U (en) * 2015-07-27 2015-11-25 南车青岛四方机车车辆股份有限公司 Test of windscreen performance of stiffness and dampness and fatigue test device in rail vehicle

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