CN211653570U

CN211653570U - Ship reinforcing server

Info

Publication number: CN211653570U
Application number: CN202020497273.2U
Authority: CN
Inventors: 经志明; 伍瑞秀; 利剑伟; 喻志刚; 梁永强; 冯勇; 严志佑; 卢锦臻; 唐春华
Original assignee: Guilin Changhai Development Co ltd
Current assignee: Guilin Changhai Development Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-10-09
Anticipated expiration: 2030-04-08

Abstract

The utility model relates to a ship reinforcing server, which comprises a case, a power supply, a mainboard component, a hard disk component, a power filter, a shielding bin and a conveying interface; the power supply, the mainboard component, the hard disk component and the power supply filter are respectively fixed in the case, and the power supply and the hard disk component are respectively connected with a power supply interface and a hard disk interface on the mainboard component through leads and data lines; a socket connected with an external power supply is arranged on the side wall of the case, the socket is connected with a power filter through a power line, and the power filter is connected with a power supply through a power supply line; the shielding bin is fixed in the case at a position corresponding to the outer parts of the socket and the power line, and seals the socket and the power line inside; the transmission interfaces are arranged on the front side and the rear side of the case and are connected with the exchange interface on the mainboard assembly through cables. The utility model has the advantages that: 1. the processing method is simple and light; 2. the requirements of complex electromagnetic compatibility environment of the ship are met; 3. the requirement of ship vibration impact is met; 4. the heat dissipation requirement is met.

Description

Ship reinforcing server

Technical Field

The utility model relates to a server field, concretely relates to naval reinforcement server.

Background

In the naval environment, firstly, a ship can generate vibration, swing and impact when navigating in sea waves, and secondly, the ship is filled with various electronic devices, can generate various electromagnetic radiation and can interfere with each other. Therefore, the common server cannot be stably and reliably used on the ship at all, and the reinforcing equipment can meet the long-term severe working environment, so that the reinforcing server which can stably and highly work in the severe environment for a long time is the problem to be solved by technical personnel in the technical field.

SUMMERY OF THE UTILITY MODEL

To sum up, for overcoming prior art's not enough, the utility model aims to solve the technical problem that a naval reinforcement server is provided, its reasonable in design, stability are high, electromagnetic compatibility is good, anti-vibration, convenient operation, easily maintenance.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a ship-based reinforcement server comprises a case, a power supply, a mainboard assembly, a hard disk assembly, a power supply filter, a shielding bin and a conveying interface; the power supply, the mainboard assembly, the hard disk assembly and the power filter are respectively fixed in the case, and the power supply and the hard disk assembly are respectively connected with a power interface and a hard disk interface on the mainboard assembly through leads and data lines; a socket connected with an external power supply is arranged on the side wall of the case, the socket is connected with the power filter through a power line, and the power filter is connected with the power supply through a power supply line; the shielding bin is fixed at a position corresponding to the outer parts of the socket and the power line in the case, and seals the socket and the power line in the case; the transmission interfaces are arranged on the front side and the rear side of the case and are connected with the exchange interface on the mainboard assembly through cables.

On the basis of the technical scheme, the utility model discloses can also make following further improvement:

further, the case comprises a case body and an upper cover; the box body is made of aluminum alloy materials and is of a square structure with an opening at the top, the upper cover is installed at the opening of the box body, and a first conductive rubber strip for ensuring the sealing performance inside the box body is arranged between the upper cover and the opening of the box body; the box body and the upper cover are respectively provided with a heat dissipation groove, and the side wall of the heat dissipation groove is in a sawtooth shape so as to increase the heat dissipation area;

the power supply, the mainboard assembly, the hard disk assembly and the power supply filter are respectively fixed at the bottom in the box body; the socket is arranged on the rear side wall of the box body, the input end of the socket, which is connected with an external power supply, extends out of the rear part of the box body, and the output end of the socket, which is connected with the power line, extends into the box body; the shielding bin is fixed on the inner side wall of the box body; the conveying interfaces are positioned on the front side and the rear side of the box body; and a cabling rack for guiding and installing the wires, the data lines, the power supply lines and the cables is fixed in the box body.

Further, the mainboard assembly comprises a mainboard, a memory, a display card, a CPU radiator, a mainboard battery and a mounting plate; the main board is fixed at the bottom of the box body through the mounting plate, the memory, the display card, the CPU and the CPU radiator are respectively mounted on the main board, and the power supply interface, the hard disk interface and the exchange interface are arranged on the main board; a mainboard state indicator lamp which is connected with the mainboard and is used for indicating the working state of the mainboard is arranged at the front side of the box body; the mainboard battery is fixed at the bottom of the box body and supplies power to the mainboard after the mainboard is powered off so as to store the individual settings of a user;

a start key and a reset key are arranged on the front side of the box body; the starting key is connected with the mainboard and used for starting or closing the mainboard, and the reset key is connected with the mainboard and used for restarting the mainboard.

Further, the hard disk assembly comprises a hard disk and a mounting rack; the hard disk is fixed at the bottom of the box body through the mounting frame and is connected with the hard disk interface on the mainboard assembly through the data line; and a hard disk state indicating lamp which is connected with the hard disk and used for indicating the working state of the hard disk is arranged on the front side of the box body.

Furthermore, a plurality of fans are arranged on the rear side in the box body, honeycomb-shaped air outlets are arranged on the rear side of the box body corresponding to the fans, and honeycomb-shaped air inlets are arranged on the front side of the box body.

Further, the transmission interface comprises a VGA interface, a gigabit network interface, a rear USB interface, a grounding column and a front USB interface; a plurality of exchange interfaces are arranged; the VGA interface, the gigabit network interface, the rear USB interface and the grounding column are arranged on the rear side of the box body, the front USB interface is arranged on the front side of the box body, and the VGA interface, the gigabit network interface, the rear USB interface, the grounding column and the front USB interface are respectively connected with the corresponding exchange interface through cables; the rear side of the box body is further provided with a fuse box, the live wire of the socket is connected with the input end of the fuse box, and the output end of the fuse box is connected with the live wire of the power filter.

Further, the cable adopts a shielded cable.

Furthermore, a sealed cabin which is inwards concave and has a forward opening is arranged at the front side of the box body, the starting key, the reset key, the air inlet and the front USB interface are positioned in the sealed cabin, and a sealed cabin door which can close or open the sealed cabin is arranged at the opening of the sealed cabin in a vertically-overturning manner; the sealed cabin door is provided with a vent hole, and one side of the sealed cabin door close to the box body is fixed with a dustproof filter element and sound absorption foam through a pressure plate; and a second conductive rubber strip which ensures the sealing performance of the sealed cabin after the sealed cabin is closed by the sealed cabin door is also fixed at the opening of the sealed cabin.

Furthermore, two sides of the lower part of the sealed cabin door are respectively provided with a rotating shaft protruding outwards, a base is fixed on the inner wall of the opening of the sealed cabin and corresponds to the rotating shaft, a round hole is formed in the base, and the rotating shaft is rotatably inserted into the corresponding round hole so that the sealed cabin door can be installed at the opening of the sealed cabin in a vertically-overturning manner; the top of the sealing cabin door is provided with a screw for fixing the position of the sealing cabin door after the sealing cabin door is turned upwards, and the position of the screw, corresponding to the position of the sealing cabin door after the sealing cabin door is turned upwards, on the front side of the box body is provided with a screw hole.

Furthermore, a handle for holding is arranged on the front side of the case.

The utility model has the advantages that:

1. the front panel, the rear panel, the side plates and the bottom plate of the aluminum alloy material are processed into the case with the required shape, and the case is assembled by screws and then welded into a sealed cavity, so that the processing method is simple and the weight is light;

2. the requirements of complex electromagnetic compatibility environment of the ship are met;

3. the requirement of ship vibration impact is met, and the operation is more stable;

4. the heat dissipation requirement is met.

Drawings

FIG. 1 is a three-dimensional schematic view of the present invention with the upper cover removed;

FIG. 2 is a schematic three-dimensional assembly diagram of the components of the enclosure, the sealed cabin door and the like;

fig. 3 is a front three-dimensional schematic view of the present invention (the door of the capsule opens the opening of the capsule);

fig. 4 is a rear three-dimensional schematic view of the present invention;

FIG. 5 is a schematic view of the assembly of the sealed door and the pressure plate;

fig. 6 is a block diagram of the working principle of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the power supply comprises a power supply, 2, a mainboard assembly, 3, a hard disk assembly, 4, a power filter, 5, a shielding bin, 6, a socket, 7, a box body, 8, an upper cover, 9, a first conductive rubber strip, 10, a heat dissipation groove, 11, a wiring rack, 12, a mounting plate, 13, a mainboard status indicator lamp, 14, a power-on key, 15, a reset key, 16, a mounting rack, 17, a hard disk status indicator lamp, 18, a fan, 19, an air outlet, 20, an air inlet, 21, a VGA interface, 22, a gigabit network interface, 23, a rear USB interface, 24, a grounding column, 25, a front USB interface, 26, a fuse box, 27, a sealing cabin door, 28, a ventilation hole, 29, a pressing plate, 30, a dustproof filter core, 31, attraction foam, 32, a second conductive rubber strip, 33, a rotating shaft, 34, a screw, 35, a handle, 36, a base, 37 and a mainboard battery.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, a ship-based reinforcement server includes a chassis, a power supply 1, a motherboard component 2, a hard disk component 3, a power supply filter 4, a shielding bin 5, and a transport interface. The front side of the case is provided with a handle 35 for holding. The power supply 1, the mainboard component 2, the hard disk component 3 and the power filter 4 are respectively fixed in the case, and the power supply 1 and the hard disk component 3 are respectively connected with a power interface and a hard disk interface on the mainboard component 2 through wires and data lines. The power supply device is characterized in that a socket 6 connected with an external power supply source is arranged on the side wall of the case, the socket 6 is connected with the power filter 4 through a power line, and the power filter 4 is connected with the power supply 1 through a power supply line. The shielding bin 5 is fixed in the case at a position corresponding to the outside of the socket 6 and the power line, and seals the socket 6 and the power line inside. The power filter 4 is mainly used for filtering an external power supply and overcoming conducted interference of a power line, so that the design of electromagnetic compatibility can be met. The installation of the power filter 4 is provided with a shielding bin 5, and the shielding bin 5 isolates the socket 6 and the power line from the inside of the case, so that radiation disturbance emission can be better solved. The transmission interfaces are located on the front side and the rear side of the case, and are connected with the exchange interface on the mainboard assembly 2 through cables.

As shown in fig. 2, the cabinet includes a box body 7 and an upper cover 8. The box 7 is aluminum alloy material and open-top's square structure, upper cover 8 is installed the opening part of box 7, and upper cover 8 with be equipped with the assurance between the opening of box 7 the inside sealing performance's of box 9 first conductive rubber strip 9 fills the connection gap, makes whole quick-witted case become a sealed cavity, strengthens the whole shielding performance of quick-witted case to conductive first conductive rubber strip 9 avoids electromagnetic radiation and interference signal to go out from the gap of

box

7 and 8 lids and leaks. The server case adopts a 19 'standard case, the height is 2U, and the appearance of the whole machine meets the requirement of a 19' rack type equipment structure. The box body 7 is formed by processing a front panel, a rear panel, side plates and a bottom plate made of aluminum alloy materials into a required shape, assembling the front panel, the rear panel, the side plates and the bottom plate by using screws and welding the front panel, the rear panel, the side plates and the bottom plate into a sealed whole. The side plates and the bottom plate on two sides of the case 7 and the upper cover 8 are all designed with heat dissipation grooves 10, and the side walls of the heat dissipation grooves 10 are in a zigzag shape to increase the heat dissipation area.

The power supply 1, the mainboard component 2, the hard disk component 3 and the power filter 4 are respectively fixed at the bottom in the box body 7. The power supply 1 is a module power supply and can provide 5V, 3.3V and 12V voltages for the mainboard and the fan 18 to use, and the hard disk is 1 2.5' 480GBSATA solid state hard disk. The socket 6 is arranged on the rear side wall of the box body 7, the input end of the socket 6 connected with an external power supply extends out of the rear part of the box body 7, and the output end of the socket connected with the power line extends into the box body 7. The shielding bin 5 is fixed on the inner side wall of the box body 7. The transport interfaces are at the front and rear sides of the box 7. A rack 11 for guiding and mounting the wires, the data lines, the power supply lines, and the cables is fixed in the box 7. The wiring racks 11 with different sizes are arranged according to the wiring direction and the space size of the internal devices and are used for fixing each line in a segmented mode, so that the line trend is attractive, the line can be fixed firmly, and damage to the line or a welding head of the line caused by vibration and impact is avoided.

The motherboard assembly 2 includes a motherboard, a memory, a graphics card, a CPU heat sink, a motherboard battery 37, and a mounting plate 12. The CPU adopts IntelXeon2600V3 series, and the memory is 16GBDDR 4. The mainboard passes through mounting panel 12 is fixed the bottom of box 7, the memory the display card CPU with the CPU radiator is installed respectively on the mainboard, and the mainboard subassembly includes mainboard, memory, display card, CPU radiator and mainboard subassembly mounting panel. The mainboard battery 37 is fixed at the bottom of the box body 7 and supplies power to the mainboard after the mainboard is powered off so as to save the personal settings of the user. The motherboard battery 37 is used for storing user personality settings such as time, date, start-up settings and the like after the motherboard is powered off. The memory can be welded on the mainboard, and devices such as a display card, a network card and a sound card are integrated on the mainboard, so that the problem that the mainboard cannot work normally due to poor contact caused by easy oxidation and loosening of golden fingers of the devices such as the separate memory, the display card, the network card and the sound card is solved. The motherboard battery 37 is separately fixed from the motherboard and connected to the power supply interface of the motherboard via a corresponding plug. The mainboard adopts the high substrate of intensity, and device rational arrangement on the mainboard, heavier components and parts take fixed measure, are close to mounting panel 12 installation as far as possible, increase the mainboard mounting hole, make the local lifting surface area of mainboard littleer, and the mainboard connector adopts buckle formula connector, and the fixed difficult not hard up that can be fine. The CPU radiator is fastened on the main board by screws. The mainboard is provided with the power interface, the hard disk interface and the exchange interface. A main board state indicator lamp 13 connected with the main board and used for indicating the working state of the main board is arranged on the front side of the box body 7. As shown in fig. 3, a start key 14 and a reset key 15 are provided on the front side of the case 7. The power-on key 14 is connected to the main board and is used for starting or closing the main board, and the reset key 15 is connected to the main board and is used for restarting the main board.

The hard disk assembly 3 includes a hard disk and a mounting bracket 16. The hard disk is fixed at the bottom of the box body 7 through the mounting frame 16 and is connected with the hard disk interface on the main board component 2 through the data line. The hard disk adopts a solid state disk form, and has the advantages of quick start, quick data reading, no noise, no mechanical activity inside, no mechanical fault, collision resistance, impact resistance, vibration resistance, large working temperature range and the like. And a hard disk state indicator lamp 17 which is connected with the hard disk and is used for indicating the working state of the hard disk is arranged on the front side of the box body 7.

The rear side of the box body 7 is provided with a plurality of fans 18, the rear side of the box body 7 is provided with honeycomb-shaped air outlets 19 corresponding to the fans 18, and the front side of the box body 7 is provided with honeycomb-shaped air inlets 20.

The transport interface comprises a VGA interface 21, three gigabit network interfaces 22, two rear USB interfaces 23, a ground column 24 and two front USB interfaces 25. As shown in fig. 4, the switching interface is provided in plurality. VGA interface 21 gigabit network interface 22 rearmounted USB interface 23 with earthing post 24 adopts aviation socket connector to install the rear side of box 7, leading USB interface 25 is installed the front side of box 7, and VGA interface 21 gigabit network interface 22 rearmounted USB interface 23 earthing post 24 with leading USB interface 25 passes through respectively the cable with corresponding exchange interface connects, the cable adopts shielded cable. A fuse box 26 is further installed on the rear side of the box 7, the live wire of the socket 6 is connected to the input end of the fuse box 26, and the output end of the fuse box 26 is connected to the live wire of the power filter 4.

The front side of box 7 is equipped with inwards sunken and opening sealed cabin forward, start key 14 reset key 15 air intake 20 with leading USB interface 25 is in the sealed cabin the opening part of sealed cabin can be about the upset install with its closed or open sealed cabin door 27. As shown in fig. 5, the sealed hatch 27 is provided with a vent hole 28, and a dust-proof filter element 30 and a sound-absorbing foam 31 are fixed on one side of the sealed hatch close to the box 7 through a pressing plate 29. The dustproof filter element 30 is used for preventing dust from entering the case, and the sound absorption foam 31 is used for reducing noise emission when the fan 18 in the case runs. And a second conductive rubber strip 32 for ensuring the sealing performance of the sealed cabin after the sealed cabin is closed by the sealed cabin door 27 is also fixed at the opening of the sealed cabin. The both sides of sealed hatch door 27 lower part are equipped with outside outstanding pivot 33 respectively, on the inner wall of sealed hatch door opening part and correspond the position department of pivot 33 is fixed with base 36, be equipped with the round hole on the base 36, the pivot 33 is rotatable insert corresponding the round hole is downthehole so that the installation that sealed hatch door 27 can overturn from top to bottom the opening part of sealed hatch door. A screw 34 for fixing the position of the sealing cabin door 27 after being turned upwards is arranged at the top of the sealing cabin door 27, and a screw hole is arranged at the front side of the box body 7 and at the position corresponding to the screw 34 after the sealing cabin door 27 is turned upwards. The sealed cabin door 27 can be freely turned up and down to open and close the sealed cabin, and two loose screws 34 are further designed on the sealed cabin door 27 to facilitate the operation of closing and opening the sealed cabin by the sealed cabin door 27.

As shown in fig. 6, the working principle of the ship-based reinforcement server is that an external power supply is connected, the power supply 1 supplies power to the main board and the internal fan 18 after being powered on, the switch of the power supply 1 is turned on, the main board is started, the CPU starts to operate, operating system files are read from the hard disk into the memory, configuration files are checked, then human-computer interaction is realized by waiting for reading user input commands and data, and interaction between a user and the reinforcement server is performed through input and output equipment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A ship reinforcing server is characterized by comprising a case, a power supply (1), a mainboard assembly (2), a hard disk assembly (3), a power supply filter (4), a shielding bin (5) and a conveying interface; the power supply (1), the mainboard assembly (2), the hard disk assembly (3) and the power filter (4) are respectively fixed in the case, and the power supply (1) and the hard disk assembly (3) are respectively connected with a power interface and a hard disk interface on the mainboard assembly (2) through wires and data lines; a socket (6) connected with an external power supply is arranged on the side wall of the case, the socket (6) is connected with the power filter (4) through a power line, and the power filter (4) is connected with the power supply (1) through a power supply line; the shielding bin (5) is fixed in the case at a position corresponding to the outer parts of the socket (6) and the power line, and seals the socket (6) and the power line inside; the conveying interfaces are arranged on the front side and the rear side of the case and are connected with the exchange interface on the mainboard assembly (2) through cables.

2. The naval vessel reinforcement server according to claim 1, wherein the chassis comprises a box (7) and a top cover (8); the box body (7) is made of an aluminum alloy material and is of a square structure with an opening at the top, the upper cover (8) is installed at the opening of the box body (7), and a first conductive rubber strip (9) for ensuring the internal sealing performance of the box body (7) is arranged between the upper cover (8) and the opening of the box body (7); the box body (7) and the upper cover (8) are respectively provided with a heat dissipation groove (10), and the side wall of the heat dissipation groove (10) is in a sawtooth shape so as to increase the heat dissipation area;

the power supply (1), the mainboard assembly (2), the hard disk assembly (3) and the power supply filter (4) are respectively fixed at the bottom in the box body (7); the socket (6) is arranged on the rear side wall of the box body (7), the input end of the socket (6) connected with an external power supply extends out of the box body (7), and the output end of the socket connected with the power line extends into the box body (7); the shielding bin (5) is fixed on the inner side wall of the box body (7); the conveying interfaces are positioned on the front side and the rear side of the box body (7); a cabling rack (11) for guiding and mounting the wires, the data lines, the power supply lines and the cables is fixed in the box body (7).

3. The naval vessel reinforcement server according to claim 2, wherein the motherboard assembly (2) comprises a motherboard, a memory, a graphics card, a CPU heat sink, a motherboard battery (37) and a mounting plate (12); the main board is fixed at the bottom of the box body (7) through the mounting plate (12), the memory, the display card, the CPU and the CPU radiator are respectively mounted on the main board, and the power supply interface, the hard disk interface and the exchange interface are arranged on the main board; a main board state indicator lamp (13) which is connected with the main board and is used for indicating the working state of the main board is arranged on the front side of the box body (7); the mainboard battery (37) is fixed at the bottom of the box body (7) and supplies power to the mainboard after the mainboard is powered off so as to store the personal settings of a user;

a start key (14) and a reset key (15) are arranged on the front side of the box body (7); the start-up key (14) is connected with the mainboard and used for starting or closing the mainboard, and the reset key (15) is connected with the mainboard and used for restarting the mainboard.

4. The naval vessel reinforcement server according to claim 2, characterized in that the hard disk assembly (3) comprises a hard disk and a mounting rack (16); the hard disk is fixed at the bottom of the box body (7) through the mounting frame (16) and is connected with the hard disk interface on the mainboard assembly (2) through the data line; and a hard disk state indicating lamp (17) which is connected with the hard disk and is used for indicating the working state of the hard disk is arranged on the front side of the box body (7).

5. The naval vessel reinforcement server according to claim 3, wherein a plurality of fans (18) are arranged at the rear side in the box body (7), a honeycomb-shaped air outlet (19) is arranged at the position corresponding to the fans (18) at the rear side of the box body (7), and a honeycomb-shaped air inlet (20) is arranged at the front side of the box body (7).

6. The naval reinforcement server according to claim 5, wherein the transport interface comprises a VGA interface (21), a gigabit network interface (22), a rear USB interface (23), a ground column (24), and a front USB interface (25); a plurality of exchange interfaces are arranged; the VGA interface (21), the gigabit network interface (22), the rear USB interface (23) and the grounding column (24) are installed on the rear side of the box body (7), the front USB interface (25) is installed on the front side of the box body (7), and the VGA interface (21), the gigabit network interface (22), the rear USB interface (23), the grounding column (24) and the front USB interface (25) are respectively connected with the corresponding exchange interfaces through the cables; a fuse box (26) is further mounted on the rear side of the box body (7), the live wire of the socket (6) is connected with the input end of the fuse box (26), and the output end of the fuse box (26) is connected with the live wire of the power filter (4).

7. The naval vessel reinforcement server of claim 6, wherein the cable is a shielded cable.

8. The naval reinforcement server according to claim 6, wherein a sealed cabin which is concave inwards and has a forward opening is arranged at the front side of the box body (7), the start key (14), the reset key (15), the air inlet (20) and the front USB interface (25) are arranged in the sealed cabin, and a sealed cabin door (27) which can be closed or opened is arranged at the opening of the sealed cabin in a vertically-turnable manner; a ventilation hole (28) is formed in the sealed cabin door (27), and a dustproof filter core (30) and sound absorption foam (31) are fixed on one side of the sealed cabin door (27) close to the box body (7) through a pressing plate (29); and a second conductive rubber strip (32) which ensures the sealing performance of the sealed cabin after the sealed cabin is closed by the sealed cabin door (27) is also fixed at the opening of the sealed cabin.

9. The naval reinforcement server according to claim 8, wherein two sides of the lower portion of the sealed cabin door (27) are respectively provided with a rotating shaft (33) protruding outwards, a base (36) is fixed on the inner wall of the opening of the sealed cabin and at a position corresponding to the rotating shaft (33), a round hole is formed in the base (36), and the rotating shaft (33) is rotatably inserted into the corresponding round hole so that the sealed cabin door (27) can be installed at the opening of the sealed cabin in a vertically-reversed manner; the top of the sealing cabin door (27) is provided with a screw (34) for fixing the position of the sealing cabin door (27) after the sealing cabin door is turned upwards, and a screw hole is formed in the position, corresponding to the screw (34) after the sealing cabin door (27) is turned upwards, of the front side of the box body (7).

10. The vessel-based reinforcement server according to any one of claims 1 to 9, wherein a handle (35) for hand holding is provided at a front side of the chassis.