REXROTH INDRAMAT MKD-090B-035-GPO-KN

描述

REXROTH INDRAMAT MKD-090B-035-GPO-KN

产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。

主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌：ABB   ,AB  ,GE,FOXBORO,本特利，英维思，伍德沃德，西屋，瑞恩，施耐德，西门子，摩托罗拉，安川。力士乐。ACSO，横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA   专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

7 ADEPT 310 and 840 Robots

6 Quantronix 0201-03776 Laser System Lot

MPM AP17 SOLDER STENCIL PRINTER

ORBO TECH 360-04-50001 Imaging System

Instron 1122 Electromechanic​al test System 1,000LBS

Intergraph FDSP11304 IMA Microscope system

INSTRON 1122 Electromechanic​al Test System

MINE ROCK MIXER BLENDER POLISHER

ROCK MINE MIXER BLENDER POLISHER

SEC Box Partition Assembly Machine

Tektronix VM700T Video Measurement Set Opt 01

Harig Bridgeport 618 Surface Grinder

CUTLER-HAMMER CP 0096SP11K71A TRANSFORMER 500KVA

Brown and Sharpe 818 Techmaster Surface Grinder Cycle

Adept 90402-30013 Robotic Module

CROWNE 30SP36 TL ORDER PICKER FORKLIFT 3000 LBS

BACHI Multi Coil Winding Machine

HP 43856A X Ray system

Haumiller Spin Welder 200CPM

HARNISCHFEGER P&H 13” MAGNETIC BRAKE

Inspect Technologies 8006-R02 Microscope Inspection Ma

JEOL JEM-100cx Electron Microscope TEM Scanning

7 LAMBDA PHYSIK LASER TECHNIK POWER CONTROLS

IBM 7540 ROBOT

CUTLER-HAMMER CP 0096SP10K70A TRANSFORMER 300KVA

Hermes Regent GU 3275S OD Grinder

Comparator 89/CMS Optical Comparator

2 Elgar AC Power Source 1751 400SR

Jones Superior Machine No 52 Bandsaw 26”

5 LAMBDA PHYSIK HV LASER POWER SUPPLY 28084030

AMETEK 4000 PHOTOMETRIC ANALYZER

Universal 4836PDH-DC200 Media Blast Machine

Champion HRA25-12 Compressor 25HP 120 Gallon

Simpson S3-14 r Step Down Transformer Converter

Kalamazoo FA350A Automatic Cold Saw

BRAUN CUBE MIXER ROCK MINING

LORAIN WAA502B INVERTER DC-AC 5 KVA

Hewlett Packard HP 8702B Lightwave Component Analyzer

HP 43855A X Ray System

8 Matsui JLS-VCM JL4VC2 Plastic Jet Loaders

BRIDGEPORT 48791 MILLING MACHINE 42X9”

3 Lindgren RF Enclosures Radio Frequency

Florida Feeders FH-2 FB-18 FF-18 FI-9 Feeder

HDPE SDR 13.5 Fiber Optic Conduit Pipe 30,000FT BLUE

HDPE SDR 13.5 Fiber Optic Conduit Pipe 30,000FT GREEN

McCormick F-CUB Tractor

CUTLER-HAMMER SPB100 CIRCUIT BREAKER

VG Gas Analysis System

5 ECONO LIFT TR20 TOTE BOX TILTERS

Brown & Sharpe Traverse Surface Grinder No1 S148826

Veet 3R Precision Radial Arm Drill

HDPE SDR 13.5 Fiber Optic Conduit Pipe 30,000 ft

TECHNIC TNR301 GOLD STRIKE BATH

2 CONAIR 18041202 MOLDING DEHUMIDIFYING DRYER 480V 3PH

Autojecter WDHS75-S 75 Ton Vertical Injection Molding

Hubbell Hipotronics 715-1/S Hi-Pot AC Dielectric Test

Harig Bridgeport 618 Surface Grinder

3 Robinaire 17500B Refigerant Recovery and Recycling S

Sumitomo Wire Harness Resistance Welder System

BRANSON 10 LASER APETURE HEAD

2 Cutler-Hammer SPB100 Switchboards

MOORFEED VIBRATORY BOWL FEEDER 62″

MOORFEED VIBRATORY BOWL FEEDER 50″

18 Sony XC-73CE Video Vision Camera CCD

Chatillon TCD500 Tension Meter

MARCH QUADREL TL2 LABELING SYSTEM TABLETOP

Tektronix TDS714L Oscilloscope Color 500MHz 4Ch 500MSa

Schneider Automation 140 CPS 114 10 TSX Quantum PLC

IDEX PULSA SERIES 7660 DIAPHRAGM METERING PUMP

LEAR SIEGLER DYNATRON 1100M OPACITY MONITORING SYSTEM

Komax Alpha 411 Automatic Crimping Machine

Friedrich Deckel 2250 Pantograph

8 Va-Tran C02 Steam Cleaner MPS-1

2 Chuo 61 kVa S1-6-204 Resistive Spot Welders

THERMO ENVIRONMENTAL 48 GAS CORRELATION CO ANALYZER

Aircel Systems R20 Refrigerated Compressed Air Dryer 2

Domino CodeBox 3 INK Jet Printer

74-70020110 ROTATING ELEMENT Turbine

HP Agilent 6032A System Power Supply 0-60V, 0-50A

MICROWAVE PWR DEVICES EWAL 1050 SOLID STATE AMPLIFIER

Chuo Seisakusho S1-6-204 Resistance Spot Welder 61 kVa

GRAPHOTYPE 6381 MULTIGRAPH Dog Tag Maker

14 MAGNETIC ANALYSIS MAC XMH031XT WIRE ANALYZER

NIPPON TANSHI ACM-11A CRIMPER 1.5TON BENCHTOP

NIPPON TANSHI ACM-11A CRIMPER UNIT 1.5TON

NIPPON TANSHI ACM-11A CRIMPER MACHINE 1.5TON

PEERLESS HYDROCONSTANT VARIABLE SPEED DRIVE M017B

LVO FL14G Stainless Steel Front Load Pan Washer

CAE PMR-5000 ULTRASONIC CLEANER

TCE 705-58 GRP 504 Winding Machine Winder

Artos TA-20R-10 Crimper Cutter w/ feeder

5 HP 85024A High Frequency Probe

FUJI DTII-5000 Optical Comparator

GTI Groningen Water Chiller G0451-98101

FALK BLENDER MINE SMELTER ROCK

Corning 12SME Optical Cable 38000ft

EIL OG-100 OIL/GLOVE TEST SET

AURORA 344A-BF 48020031 PUMP

Stangenes Isolation Transformer SI-7356 100KVDC 500W

Tektronix VM700A Measurement Set Opt 01,21,30,48

PRYSMIAN 288F OFNR SMF-28E RILT OPTICAL CABLE 700FT

Omega-Alpha Metals 500 Ionic Contamination Test System

REX WH82 Welded Steel Mill Chain

CSI CS39 FLEX Abrasion Tester

27 Stanley 120-7180 AGR Framed Sliding Doors

TECHNOS 73-00200020 RADIAL FAN WHEEL

Rota-Flow DP-150-E30 Hydraulic Motor Dover 30HP

Schlumberger SRS 7776006601 Rev01 MainFrame 16 Front P

Sumitomo SE54Q2MT-072 Fiber Optical Cable 1500FT

Chemical Safety Technologies Pump Station BCA Sump

Reliable Rubber Plastic 4319 Press Platen Hydraulic

AUTONETICS P116A EVACUATION CHAMBER & CONSOLE

NITTAN TECHNO ACM-20 CIMPING UNIT

Rockwell Delta Fiber Glass Vertical Band Saw

Marconi Instruments 2022D 10Hz 1GHz Signal Generator

Domino CodeBox 3 Ink Jet Printer

Tokyo Weld TWA-6000 High Speed Chip Tapping Machine

SCANRAY TORREX 150D X-RAY INSPECTION SYSTEM

National Instruments PCI-6542 Digital Wave Form Genera

Audion Elektro VM201 PAC Audiovac Vacuum Sealer

2 Shermco AC Distribution 2300V ITE/ED

KH Hupport ST Electric Burn-In Furnace

JLG LIFT CAGE BOOM

SMI Press Stamping Dies Die Set

AUTOBAG HB25 593003A3 PACESETTER

MONARCH 10EE ENGINE LATHE

Cascade Forklift Attachment 4295 Roll Clamp 3700lb 25′

Kato Sychronous AC Generator 4.13 KVA

FUSION UV SYSTEM P300 CURE I300MB

FACET MAU-II Oil/Water Separator OIL WATER

NITTAN TECHNO ACM-20 2TON CRIMPING MACHINE

Contraves Servo Control Cabinet D704738

Power Ten P62B-30100 DC Power Supply 200-240 VAC

Yaskawa CACR-SR Servopack

Tektronix T576 Curve Tracer

3 Sun Chemical 543385503-000 sierra magenta 0410

HP 4274 Multi-Frequency LCR Meter

Pacific Smart Source 115 ASX AC POWER SOURCE 1500VA

Dymax Light Curing System 2000 Flood UV

AUTOSPLICE 635085 PIN INSERTION AUTOMATIC MACHINE 120V

Davis 12LAHR-03-15 12 Rotary Table Servo

6 YASAKI TERMINAL PRESSES HMY32DT

TREK NMP Batch Cleaner Ultrasonic

TREK Film Cleaner NMP Inline Ultrasonic

2 Electrovert SUPA 1N Spray Station Flux Wave Solder

Faithful Screen Heat Press Print 8×6

450 SYMBOL LA-4131 WIRELESS CARDS

OGDEN CK5A-0581 CIRCULATION HEATER 30,000W

B&G 900GPM 50HP WATER PUMP

Service Vibration Vibratory Bowl 24”

800ft Rolled Aluminum Sheet .0078 gauge

HANNIFIN 2225-1 E-143JE 1266BR HYDAULIC PRESS

NITTO TB-52 LABEL DISPENSER

ROCKWELL 622-4160-015 DIGITAL RADIO ALTITUDE INDICATOR

AM MULTIGRAPHICS 20F SCANNER

BLUE M OVEN B1-32F-1 Batch Oven 572 F

40X24” ANVIL TABLE

BARCO R9200906 PROJECTORS GRAPHICS

NUGIER H25-7MD3 HYDRAULIC PRESS 25TON

Tektronix TDS544A Four Channel Digitizing Oscilloscope

Dillon Weigh-Tronix Motorized DTM Tensile Test System

Hofmann HL 3/01/5/5029 Rotor Armature balancing system

Meiji Techno Microscope

4 Michelin Offroad TIRES 16.00 R20 X2L TUBELESS STEEL

2 Mitutoyo Microscope AT112

Gallmeyer & Livingston No. 45 Surface Grinder

Vibco SCR-400 Vibratory Table

NORDSON RHINO BU-ADLSMA15RKVN BULK UNLOADER

2 GH Bushnell Press & ML Andrew 2388 Antique Machines

Signode SP-300 Strapping Machine SP300

Automated Assembly RZ-300SLVGXX Robot

Sintech 210-0000 Wire Strength Tester

NITTAN TECHNO ACM-20 CRIMPING PRESS 20T

M&Q Plastic Tube for Cable/Wire 38103573 10mm BKFN SLI

OGDEN CK5A-0581 CIRCULATION HEATER 30,000W

DURIRON EV-1 AQUA CARE FILTRATION SYSTEM

NWL Capacitors 3209A 10770 Capacitor 1.67UF 90KVDC

FURNAS D72069-32 MAGNETIC CONTROLLER COIL SIZE 5

Branson Ultrasplice Ultrasonic Welder LOT BATCH

Mecal Crimp Press Crimper PE7

Schlumberger SRS 7776006601 Rev01 MainFrame 16 Front P

NITTAN TECHNO ACM-20 CRIMPING MACHINE

NITTAN TECHNO ACM-20 CRIMPING MACHINE 20T

NITTAN TECHNO ACM-20 CRIMPING MACHINE

NITTAN TECHNO ACM-20 CRIMPING MACHINE

LEAR SIEGLER MC2000 VISSIBLE EMMISION MONITOR

DAVID SYSTEMS 6102-01 5 SLOT CONCNTR W/ MODULES

LEAR SIEGLER MC2000 VISSIBLE EMMISION MONITOR

21 FOXBORO SPEC200 240SJ CONTROL STATION

GE CR206G0 Size 5 Magnetic Starter

THERMO ENVIRONMENTAL 200SPC STACK PROBE CONTROLLER

ITT STANDARD PF20 PLATEFLOW HEAT EXCHANGER 230F

Torit 54 Cutting Saw

Techron 5530 Power Supply Amplifier

HP 8568B Spectrum Analyzer

2 Erbium Crystalase CLR2940 YAG Dermatology Laser

Twin City Monorail 14948 Overhead TwinCity

Amsco Vacamatic A 3110 PF Motor Maration Electrics

Tektronix 577 Curve Tracer

Hannifin Hydraulic HC 1.5 Press 1.5 Ton T-2099

Despatch Industries V-34 HD Electric Oven

FONS Single Mode 48 Fiber Type OFNR E92319 Fiber Optic

3 Exide Dynacell DDH 125-15 phone system dry batteries

IFS VIBRATORY BOWL PlASTIC FEEDING SYSTEM 19″

5 Square D SCA44 8538 COMBO FUSIBLE MOTOR STARTER

TECHRON 7560 POWER SUPPLY AMPLIFIER

Rampe Hytrol MB-2 Tumbler Sifter Conveyor System

2 ARTOS TU-3 TERMINATING UNIT CRIMPER

1000 SCIENTIFIC ATLANTA ER1 E2050ER1 REMOTE CONTROL

CLEVELAND EASTERN MIXERS RA-3 INK MIXER INPUT 220VAC

7 Hakko 472D-02 Desoldering Station

MINE & SMELTER 3-F BENCH GRINDER

GE MX X-Ray Tube Mode 46-155500G18 46-155318G36 46-155

HP 75000 Series B

Zentech 9032A Programmable Auto Safety Tester Hipot

Techron 5530 Power Supply Amplifier

Stainless Steel Architecture Statue Structure

ROM AIR 55″ FUME AIR EXTRACTOR 5HP 480V

8 Van Der Graaf TM113B25-6252 Drum Conveyor Motors

Sorensen DCR80-33B DC Power Supply

BENTLY NEVADA 3300 DUAL ACCELEROMETER MONITOR

Howell Red Band BB Propeller Motor

SIEMENS SIMATIC S7-300 PLC

50 GRINNELL FIG 772 RIGID FIRE COUPLING 6”

6 ZEBRA 170XiII 170XiIII LABEL PRINTER

2 GORTON PANTOGRAPH

18 Sterile Containers

LDS DVC 4000 Digital Vibration Controller

NIPPON TANSHI ACM-11A CRIMPING PRESS 1.5TON

COPELAND COPELAMETIC KAT4-0100-CABN COMPRESSOR

NIPPON TANSHI ACM-11A CRIMPING MACHINE 1.5T

Fluke PM5193 V/PH Programmable Synthesizer Function Ge

Lambda PS-421910-12 Module DC Power Supply

AUTONETICS VACUUM CHAMBER FLUIDIZER

Sciex API III Plus Biomolecular Mass Analyzer

4 Autotronic SU-16B/EJQ-22 Collimator Set

Fuji MRA6185J 3 Phase Induction Motor 30kW

Cal-Power M6175 DC Power Supply 40V/100A

DIE PRESS 3000PSI

NIPPON TANSHI ACM-11A CRIMPING MACHINE 1.5T

6 CATEL 153199-1 TV Modulator

Hobart RC-450 RVS Mega MIG Welder

Robo Cylinder RCP-R5A-A-H-200​-S RCP-S5A-A-H-400​-S XY

Precision Scientific 88046 Astromet Polisher

Linde UCC-305 TIG/Stick Welding Power Supply

Linde UCC-305 TIG Stick Welding Power Supply

Baldor JMM3314T 15HP Motor Price Pump

GOULDS ITT 1SVCK7 SSV CENTRIFUGAL PUMP

336 FORD OMRON F80B-14B192-AA PLUG-IN RELAY

MECAL AT80BN/4 CRIMP PRESS

Amperex YD1160 Triode

BENTLY NEVADA 3300/55 DUAL VELOCITY MONITOR

Corona 42X62XSM Screen Printing

Price Pump JB150ss-700-212​11-PED Motor 10HP

W 107707 Water Pump Motor

Linde UCC-305 TIG Stick Welding Power Supply

Baldor JMM3219T 7.5HP Motor Price Pump

Milford Multihead 56 Riviter Automated Assembly 9”

Edmund Buhler GMBH VKS Orbital Shaker

APPLIED BIOSYSTEM 341 NUCLEIC ACID PURIFICATION SYSTEM

PRECISION WELDER

MOORFEED MFD15Y VIBRATORY BOWL FEEDER 21”

3 Nutek 2000-0790-B04 Bareboard Loader

ABB ACH401601635 Adjustable Frequency AC Drive

Nittoku Engineering SCC-01 Saddle Coil Checker

10 STACKABLE CONTAINERS METAL STORAGE CRATES 44X57X37

Imtran GS100 Pad Printer

Hobart Mega Flex 450 RVS Welder Mig RCC

Miller 330 A/B AC/DC tungsten-ARC Welding Power Source

Imtran GS100 Pad Printer

Coherent Innova Spectrum 70 Laser

2 RCA Titan Zeiss 5510544 Microscopes

Koyo Direct Logic 205 D2-09B-1 PLC

Rhino Tech AFP695-0 Parts Washer

Wild Heerbrugg Makrozoom 1:5 Inspection Lense

LEXEL IMAGING SYSTEM 81736-02 CRT PROJECTOR

2 Zebra 140XiIII Xi Thermal Label Printer

Kulicke & Soffa K&S 1484 XQ Auto Wire Bonder

2 NIPPON AVIONICS AVIO NA-72 Resistance Welding Machin

Unitek Weldmatic 1-024-02 and 3-028-04

Captron 5.5MF 20000VDC +/- 10% Capacitor 959-358701

Wild Heerbrugg MakroZoom 1:5 Lense

Wild Heerbrugg Makrozoom 1:5 lense

G&L Beijer Electronics AB E200 + R5-422 Cable

KOMAX 020573/C240D ALPHA BOARD I/O B109C

Zumbach ODAC 15XYJ Measuring Head

CEMC 5.5MF 20000VDC +/- 10% Capacitor 142-1920

ECONO LIFT TR20 TOTE BOX TILTER

ABB FLAKT V4550220-0100 CONTROLLER EPIC II

38102800 1″ CV PPI 28 half MR Split flex tubing

4 Tektronix Curve Tracer Test Fixtures 013-0124-00 013

Phillips PM5695A TV Monitoring demodulator

Pirelli LEM-EM M05 Board

VSR Corporation M527 Single Phase Oscillator

37 SECO MJ 7683 W/J POLISH 883

PHOTON PS-5000-4

COLONIAL BROACH Punch PRESS VJ1-2-12 A7-T

Sorensen DCR 80-33B M22 DC Power Supply

7 Sierra Instruments TopTrak Mass Flow Meter 822-13-0V

4 Corning Vertical Cutoff Machines

Behlman 50-C-1957A AC Power Supply 0-130V 45-2000Hz

Puffer-Hubbard 1949 Antique Enamel Freezer 3 Door

BIOMED RE-9450 MEDICAL EXAM TABLE

DAVIDSON D696 AUTOMATIC AUTOCOLLIMATOR ELECTRONIC UNIT

MODICON PC0085 12 SLOT PLC

2 SQUARE D 7004 HGO-1 300A DC CONTACTOR

BENTLY NEVADA 3300/55-06-01 DUAL VELOCITY MONITOR

WESTINGHOUSE VERITRAK 75PS3101 POWER SUPPLY

WESTINGHOUSE VERITRAK 75PS3101 POWER SUPPLY

SIEMENS-ALLIS STATIC TRIP II TSG

Anorad Gantry Series PCB Assembly

Anorad Gantry Series BCB Assembly

ILX FOS 79880/000 Tunable ECL Source

Phoenix DL-24_ARM Dock light

WEBER SCREWDRIVING SYSTEM SURETORK PC-WFSC-501-024

Black & Webster BW-35 Orbital Riveter

ZEHNTEL 1800 45001 CHASSIS

Solartron Schlumberger 1210 Random Vibration Controlle

6 Intermec 6650 Norand Pen Tablet Computer

2 LE CROSS CONDUIT CABLE CUTTERS SPLICER

KEITHLY DAS-1801ST-DA CARD

KEITHLY DDA-08/16 PC9172 14286 REV3 CARD

JAM Toyo Jamco Wire Crimper

AUMANN WG300 BENCH TOP WINDER

MELLES GRIOT 59LGJ423 INVARITAR

STOKES VACUUM 291-020 OIL MIST SEPARATOR

ROBOTRON WELD CONTROL W/ FEDERAL TRANSFORMER

12 Damont Engineering Cylinder CYL-A100

LOCK Metalcheck 9 Metal Detector

AMP 672126-3 Crimping Machine

10 STACKABLE CONTAINERS METAL STORAGE CRATES 44X57X37

2 AGILENT HP 6812B AC POWER SOURCE ANALYZER

ismet high voltage transformer DA 92/093587 HG 40-5-02

ISMET DA98 702044 97/715312/1 High Voltage Transformer

Spellman RHR40PN120X253 Hi-Pot Tester High Voltage Pow

3S Phoenix 8013 Inspection System Pick & Place

FAIRBANKS MORSE 22,500 LBS Scale Printomatic

4 Signode Rapz Strapping Cart Strap Wire

HITACHI 5188 ELEVATOR CHAIN LIFT

FISHER SCIENTIFIC ISOTEMP 1028P HEATING COOLING BATH

NITTAN TECHNO ACM-20 CRIMPING MACHINE

3 Guardian Protective Packaging Liners

Tektronix VX4357 SPDT Relay Switching VXI Module

ILX FOS 79800D/315L2 Precision Fiber Optic Source 1585

2 HP Agilent 6459A DC Power Supply 0-64 V/0-50 A.

Beckman Instruments DU640 Spectrophotomet​er

SODICK Hydraulic Cylinder Piston

ADC SE-5562MT-072 PUREBAND OFNR OPTICAL CABLE 415FT

BLUE M BM7000 PROCESS CONTROL

ARO 3860-2003-1-160 PNEUMATIC CYLINDER

Systron RS320-2C Power Supply 0-320VDC12A

PULIZZI PC726-D-2482 POWER DISTRIBUTION UNIT

Nordson 102234A Centrifugal Machine

BalTec Radial RN180 Riveter Riviter Spinner Hydraulic

Solomat MPM 2000 Modumeter

30 Wire Decking Pallet Skid Racks

Spectrolinker XL-1500A UV Crosslinker Spectronics

Spectra Physics 314 Ion Laser Water Conditioner

Coherent Thyratron Supply Unit

Weinman 3KH4A-00P14G-3 Pump 15 HP

Candela LFDL-8 Long Pulse

Deray Continuous Splice Sealer FST165

Augat Photon PS-5000-4 PS-5000

Augat Photon PS-5000-4 PS-5000

Augat Photon PS-5000-4 PS-5200

Tektronix VM700A Video Measurement Set

BRANSON 222-100-016 REV122 LASER MODULE INTERFACE

SIEMENS FXD63B250 ITE CIRCUIT BREAKER

Jet VBS 1610 Vertical Bandsaw

Chroma 2135 Programmable Video Pattern Generator 135MH

6 HEAVY DUTY INDUSTRIAL HUB BEARINGS

MOORFEED MFD15Y 71203 VIBRATORY BOWL FEEDER 12”

HP 8903A Audio Analyzer

BENCHMASTER 182A-2 ROTARY DIE PRESS

Marley Aquatower 87-2287C Cooling Tower

Ok Industries MTR-2001 Mixed Technology Rework

Socapel Socasin AC-Servo ST1 10-310 Digital Motion Co

SORENSEN DCS 300-3.5 DC POWER SUPPLY

LOCTITE 97006 Precision Syringe Dispenser

Socapel Socasin AC-Servo ST1 10-310 Digital Motion Con

S/200/60794 Polyester Film MYLAR

专业销售进口DCS  PLC系统备件模块

PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家