CN112795975B

CN112795975B - Chromium plating production line and production process applied to same

Info

Publication number: CN112795975B
Application number: CN202011563887.7A
Authority: CN
Inventors: 张金; 冯贤; 张连明; 张炳力
Original assignee: Taicang Xiaxin Electroplating Co ltd
Current assignee: Taicang Xiaxin Electroplating Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-11-30
Anticipated expiration: 2040-12-25
Also published as: CN112795975A

Abstract

The application relates to the technical field of electroplating processing, in particular to a chromium plating production line and a production process applied to the production line, which sequentially comprise a front cleaning pool group, an electroplating pool and a rear cleaning pool group, wherein drying pools are arranged between the front cleaning pool group and the electroplating pool and between the electroplating pool and the rear cleaning pool group; the front cleaning pool group sequentially comprises a solution cleaning pool and a first clean water pool, and the rear cleaning pool group comprises a second clean water pool and a third clean water pool; a waste gas recovery box is arranged at the mouth end of the electroplating pool; an air injection mechanism and an electric heating mechanism are arranged in the drying pool; a waterproof heat-conducting component is covered on the electric heating component in the drying pool; still including erectting the guide rail of washing group top in the front, the guide rail is organized by the washing group of preceding group and is extended towards back washing group, slides on the guide rail and is equipped with the portal frame, and the portal frame is gone up to hang and is equipped with the lifting rod that is used for hanging the work piece that treats to plate. This application has the automatic production of plating of hanging of realization work piece, reduces the leading processing and dilutes the plating solution, improves the effect of the electroplating quality of work piece.

Description

Chromium plating production line and production process applied to same

Technical Field

The application relates to the technical field of electroplating processing, in particular to a chromium plating production line and a production process applied to the production line.

Background

Chromium is a silver white metal with slight blue color, the chromium metal is very easy to passivate in the air, and a layer of extremely thin passivation film is formed on the surface of the chromium metal, so that the property of the noble metal is displayed. Electroplating is to use the principle of electrolysis, wherein, plating metal or other insoluble materials are used as an anode, a workpiece to be plated is used as a cathode, cations of the plating metal are reduced on the surface of the workpiece to be plated to form a plating layer, and the chromium plating layer has good chemical stability, does not act in alkali, sulfide, nitric acid and most organic acids, but can be dissolved in hydrochloric acid (such as hydrochloric acid) and hot sulfuric acid. Chromium has a reflectance of about 65% in the visible range, between that of silver (88%) and nickel (55%), and is superior to silver and nickel in that chromium does not discolor and retains its reflectance for a long time in use.

Chinese patent publication No. CN111485275A discloses a rack plating production line, which comprises a pretreatment device, an electroplating device and a post-treatment device, which are sequentially arranged, wherein the pretreatment device comprises a plurality of pretreatment tanks, the electroplating device comprises an electroplating tank, and the post-treatment device comprises a plurality of post-treatment tanks; the rack conveying device comprises a conveying frame, wherein the conveying frame extends from a pretreatment device to a post-treatment device, the conveying frame is provided with a conveying device in a sliding manner for conveying a hanger, and the conveying device is provided with a lifting device for placing the hanger into a pretreatment pool, an electroplating pool or a post-treatment pool or taking the hanger out of the pretreatment pool, the electroplating pool or the post-treatment pool; the top surface of the electroplating pool is provided with a slide rail, the slide rail is arranged along the direction from the pretreatment device to the post-treatment device, and a slide rod for bearing a hanger is arranged in the slide rail in a sliding manner; the slide rod is provided with a driving device which is used for enabling the slide rod to slide in a reciprocating way along the direction from the pretreatment device to the post-treatment device.

In view of the above-mentioned related technologies, the inventor believes that there are often depressions on the workpiece, before and after the electroplating treatment of the workpiece, the workpiece is put into the electroplating tank with the pretreatment liquid in the pretreatment device, and the workpiece is put into the post-treatment device with the electroplating liquid, and the pretreatment, electroplating and post-treatment are easy to mix a large amount of different treatment liquids after long-term use, resulting in dilution of the electroplating liquid and serious influence on the electroplating effect of the workpiece.

Disclosure of Invention

In order to reduce the dilution of electroplating solution by the pre-treatment solution and improve the electroplating effect of workpieces, the application provides a chromium plating production line and a production process applied to the production line.

In a first aspect, the chromium plating production line provided by the application adopts the following technical scheme:

a chromium plating production line sequentially comprises a front cleaning pool group, an electroplating pool and a rear cleaning pool group, wherein drying pools are arranged between the front cleaning pool group and the electroplating pool and between the electroplating pool and the rear cleaning pool group;

the front cleaning pool group sequentially comprises a solution cleaning pool and a first clean water pool, and the rear cleaning pool group comprises a second clean water pool and a third clean water pool;

a waste gas recovery box for absorbing electroplating waste gas is oppositely arranged at the opening end of the electroplating pool;

an air injection mechanism externally connected with a blower device and an electric heating mechanism used for heating the drying pool are arranged in the drying pool;

the electric heating mechanism comprises a plurality of electric heating parts arranged on the inner wall of the drying pool, and water-proof heat conducting parts are covered on the electric heating parts in the drying pool;

still including erectting the guide rail of preceding cleaning pool group top, the guide rail by preceding cleaning pool group is towards the extension of back cleaning pool group, just it is provided with the portal frame to slide on the guide rail, the lower part of portal frame is fixed with the edge the walking shell that the guide rail removed, the walking shell internal rotation is provided with the walking gear, just along self extending direction on the guide rail be provided with walking gear engaged with guide rack, be provided with the drive on the walking shell walking gear pivoted travel drive subassembly, the portal frame is gone up to hang and is equipped with the lifter that is used for hanging the work piece of waiting to plate, just be provided with the drive on the portal frame lifter elevating movement's lift drive subassembly.

Through adopting above-mentioned technical scheme, operating personnel drives the portal frame through drive walking drive assembly and removes along the guide rail, will treat that the electroplating work piece is hung and establish on the lifter, cooperation drive lift drive assembly drives the work piece and puts into solution in proper order and washs the pond, first clean water basin carries out leading processing, then put into the stoving pond, it blows and cooperate the stoving of electric heat rising mechanism to dry through jet mechanism, then put into the electroplating pond and electroplate, waste gas recovery case absorbs the harmful waste gas of electroplating production this moment, put into the stoving pond again in proper order at last and dry and wash the derivation through second clean water basin and third clean water basin, be favorable to reducing leading processing solution and dilute the plating solution, improve the electroplating effect of work piece.

Optionally, a limit groove is formed in the top surface of the guide rail along the extending direction of the guide rail, the guide rack is fixed to the bottom wall of the limit groove, the lower portion of the walking gear is attached to the opposite groove side wall of the limit groove, the walking driving assembly comprises a walking motor fixed to the side wall of the walking shell, and the output end of the walking motor is fixedly connected with the walking gear coaxially;

guide grooves are respectively formed in the two opposite side walls of the guide rail along the extending direction of the guide rail, guide wheels are rotatably arranged on the two opposite side walls of the walking shell, a pair of the guide wheels corresponds to the two guide grooves one by one, and the wheel surfaces of the pair of the guide wheels are oppositely attached to the bottom walls of the corresponding guide grooves;

the portal frame comprises a hoisting beam and support rods which are longitudinally and fixedly connected with two ends of the hoisting beam;

be provided with the cavity along self axial in the hoist and mount roof beam, lift drive assembly is including fixing the elevator motor one of hoist and mount roof beam one end, the output of elevator motor one is with axle center fixedly connected with bull stick, just the bull stick is followed hoist and mount roof beam length direction rotates and connects in the cavity, there are a plurality of wind-up rolls along self axial fixity on the pole wall of bull stick, just the rolling has the suspender that is used for hanging to connect on the wind-up roll the lifting rod.

Optionally, the hoisting beam is located the cavity internal fixation has a plurality of confessions the bull stick rotates the rolling bearing who connects, be fixed with pressure sensor on rolling bearing's the holding surface, just be fixed with on the hoisting beam and connect pressure sensor's controller one, be fixed with electric connection on the pole wall of hoisting beam the warning light one of controller one.

Optionally, opposite surfaces of the two support rods are longitudinally provided with lifting grooves, two ends of each lifting rod slide along the lifting grooves, one end, located on the hoisting beam, of each lifting groove is fixedly provided with a lubricating sponge, the side wall of each support rod is fixedly provided with an oil conveying box, the oil conveying box is provided with an oil pump, the extraction end of the oil pump is connected with the oil conveying box, and the extraction end of the oil pump is connected with the lubricating sponge;

the walking shell is provided with an oil spraying shell, the oil spraying shell is provided with an oil nozzle used for facing the oil spraying nozzle for spraying lubricating oil on the walking gear, an oil storage box is arranged on the walking shell, the oil storage box is provided with an air pump for connecting the oil storage box, one end of the guide rail faces the walking shell, the limit switch is arranged on the walking shell, and the limit switch controls and connects the air pump.

Optionally, be fixed with on the lift bar and hang the spiale, the suspender is around going out the one end of bull stick is around establishing hang on the spiale, just the centre gripping is used for pressing from both sides tightly on the suspender is around going into hang the area section of spiale with the suspender is around going out hang the fixation clamp of the area section of spiale, be provided with force sensor on the fixation clamp, just force sensor's one end is connected the fixation clamp, the other end is connected the suspender is around going out hang the area section of spiale, be provided with the connection on the walking shell force sensor's controller two, just be provided with electric connection on the walking shell the warning light two of controller two.

Optionally, a plurality of frame rods are longitudinally erected in the drying pool, two adjacent frame rods are arranged along the length direction of the inner wall of the drying pool, sliding grooves are respectively formed in opposite surfaces of the two adjacent frame rods along the axial direction of the frame rods, a lifting plate is connected between the two adjacent frame rods in a sliding manner along the sliding grooves, and a plurality of spray pipes are arranged on the lifting plate;

a first lifting motor is fixed on the drying pool at the pool opening, the output end of the first lifting motor is vertically downward and is fixedly connected with a lead screw coaxially, the lifting plate is in threaded connection with the lead screw, and a limiting block is fixedly sleeved at one end of the lead screw, which faces to the inner bottom wall of the drying pool;

the inside wall in stoving pond by pond mouth open end slope is downward, just the inside wall in stoving pond from top to bottom slope inwards, the stoving pond is located pond mouth end is followed the inside wall length direction in stoving pond is provided with the pipe that is used for external jet-propelled equipment, be provided with a plurality of shower nozzles along self axial on the pipe, and it is a plurality of the injection direction of shower nozzle is on a parallel with the inside wall incline direction in stoving pond.

Optionally, the electrical heating part sets up to the electrical heating piece, water proof heat-conducting part sets up to the heat-conducting plate, the heat-conducting plate sets up the interior diapire in stoving pond, and a plurality of the electrical heating piece is fixed the heat-conducting plate orientation on the face of diapire in the stoving pond, the heat-conducting plate slope sets up the interior diapire in stoving pond, just the stoving pond is located liquid delivery port has been seted up to the pool wall of heat-conducting plate bottom one side, the lateral wall in stoving pond is located be connected with the delivery pipe on the liquid delivery port, just be provided with the water valve on the delivery pipe.

Optionally, a space for placing the electroplating workpiece into the electroplating pool is reserved between the two opposite waste gas recovery boxes, a plurality of air suction ports are formed in the two opposite side surfaces of the two opposite waste gas recovery boxes, and the waste gas recovery boxes are connected with air suction pipes externally connected with air suction equipment;

a collecting part for accumulating acid mist is arranged in the waste gas recovery tank towards the air suction port, a collecting box for collecting the acid mist accumulated on the collecting part is arranged on one side of the waste gas recovery tank, the collecting part is arranged as a flow baffle plate, the flow baffle plate is arranged along the arrangement direction of the air suction ports, the bottom of the flow baffle plate is fixedly connected to the inner wall of the waste gas recovery tank below the air suction port, and the top of the flow baffle plate is inclined towards the top of the waste gas recovery tank;

the inner walls of the flow baffle and the waste gas recovery box are provided with a flow guide channel which faces one side of the waste gas recovery box, the waste gas recovery box is positioned on one side of the bottom end of the flow guide channel and is connected with a flow guide pipe, the other end of the flow guide pipe is connected with the collection box, and the connecting end of the exhaust pipe and the waste gas recovery box is positioned on one side of the flow baffle, which deviates from the air suction port.

It is optional, waste gas recovery case includes that box and lid establish the case lid at the box top surface, the case mouth has been seted up to the box top surface, just the box top is located the annular has been seted up to case mouth circumference, the case lid orientation be fixed with on the face of case mouth and be used for pegging graft the sealed inserted block of annular, the outer wall of box is located a plurality of induction port upper shield is equipped with the filter screen panel, the outer wall of box is located a plurality of induction port array direction's top and has seted up the draw-in groove, the filter screen panel articulates there is the joint be used for the cassette of draw-in groove, one side that self hinged end was kept away from to the filter screen panel is fixed with and is used for adsorbing the magnet piece of box outer wall.

In a second aspect, the chromium plating production process provided by the application adopts the following technical scheme:

a chromium plating production process comprises the following steps:

s1, hanging: hanging the processed workpiece on a lifting rod, and driving a portal frame and the lifting rod to move above a first solution cleaning pool;

s2, acid washing activation: adding solution components of 50g/L sodium chloride, 100 g/L37% hydrochloric acid and 150g/L ferrous chloride into the first solution cleaning pool, wherein the temperature is 20-30 ℃, the current density is 2-6A/dm, descending the lifting rod and placing the workpiece into the first solution cleaning pool for 1-2 min;

s3, washing: driving the portal frame and the lifting rod to transfer the workpiece into a first clean water pool, and washing at least twice;

s4, drying: driving the portal frame and the lifting rod to transfer the workpiece into the drying pool, drying and blowing the workpiece through the air injection mechanism, and simultaneously switching on the electric heating mechanism to bake the workpiece;

s5, hexavalent chromium electroplating: driving a portal frame and a lifting rod to transfer the workpiece into an electroplating pool, wherein the electroplating solution is 200-250g/L chromic anhydride and 2-5g/L sulfuric acid, the current density is 20A/dm, and the temperature is 45 ℃;

s6, drying: as with S4;

s7, washing: driving the portal frame and the lifting rod to transfer the workpiece into a second clean water tank for washing;

s8, ultrasonic water washing: driving the portal frame and the lifting rod to transfer the workpiece into a third clean water tank, and cleaning the workpiece by matching with an ultrasonic generator;

s9, drying: as with S4;

s10, unloading and checking;

and S11, packaging.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present application for embodying the whole of a chromium plating production line.

Fig. 2 is a schematic structural diagram for embodying a portal frame, a traveling shell, a guide rail, a lifting rod, a hanging strip, an oil delivery box, a lifting driving assembly, a traveling driving assembly, a first controller and a first warning light in the embodiment of the application.

Fig. 3 is a partial sectional view for embodying a traveling gear, a guide rack, an oil jet case, an oil storage box, and an air pump in the embodiment of the present application.

Fig. 4 is a partial sectional view for embodying a cavity, a rotating rod, a rotating bearing, a pressure sensor, a second controller and a second warning light in the embodiment of the present application.

Fig. 5 is an enlarged view of fig. 2.

FIG. 6 is a schematic structural diagram for embodying the exhaust gas recovery box, the filter screen, the magnet, the collection box, and the flow guide pipe in the embodiment of the present application.

Fig. 7 is a cross-sectional view for embodying a flow baffle, an air suction port, a sealing insert, a sealing sleeve thereof, a ring groove and a clamping groove in the embodiment of the present application.

Fig. 8 is a broken-away sectional view for embodying the inclination direction of the diversion tunnel, the diversion pipe, and the solenoid valve thereof in the embodiment of the present application.

Fig. 9 is a schematic structural diagram for embodying the whole of the drying pool, the air injection mechanism, the rack bar, the first lifting motor, the lifting plate, the screw rod and the guide pipe in the embodiment of the application.

Fig. 10 is a sectional view of a heat conductive plate, an electric heating plate, a liquid outlet port, a fluid guide tube, a water valve, and a stopper for embodying the inclined heat conductive plate in the embodiment of the present application.

Fig. 11 is a cross-sectional view of two opposite inclined inner walls, ducts and nozzles of the drying basin according to the embodiment of the present invention.

Reference number 1, gantry; 10. hoisting the beam; 100. a cavity; 11. a support bar; 111. a lifting groove; 12. a walking shell; 13. a traveling gear; 14. a guide wheel; 15. a lubricating sponge; 16. an oil delivery box; 17. an oil pump; 18. a synchronizing shaft; 19. a connecting rod; 2. a guide rail; 20. a limiting groove; 21. a guide rack; 22. a guide groove; 23. a support leg; 3. a lifting bar; 30. a hook; 31. hanging the connecting shaft; 32. a fixing clip; 33. fixing the ear plate; 34. a slider; 4. a lift drive assembly; 40. a first lifting motor; 41. a rotating rod; 42. a wind-up roll; 43. a sling; 44. a rotating bearing; 45. a second speed reducer; 5. a travel drive assembly; 50. a traveling motor; 51. a first speed reducer; 6. spraying an oil shell; 60. an oil jet; 61. an oil storage box; 62. an air pump; 63. a limit switch; 7. a pressure sensor; 70. a first controller; 71. a first warning light; 8. a tension sensor; 80. a second controller; 81. a second warning light; 9. an electroplating pool; 90. a solution cleaning tank; 91. a first clean water tank; 92. a drying pool; 921. a pool opening; 922. a liquid outlet; 923. a discharge pipe; 924. a water valve; 925. an air injection mechanism; 9251. a nozzle; 9252. an air inlet pipe; 926. an electric heating mechanism; 9261. an electrical heating sheet; 9262. a heat conducting plate; 927. a frame bar; 9271. a chute; 928. a lifting plate; 9281. a second lifting motor; 9282. a screw rod; 9283. a limiting block; 9284. a support; 9285. connecting blocks; 929. a conduit; 9291. a spray head; 93. a waste gas recovery tank; 931. a box body; 9311. an air suction port; 9312. a box opening; 9313. a ring groove; 9314. a card slot; 9315. an air extraction opening; 932. a box cover; 9321. sealing the insert block; 9322. sealing sleeves; 9323. a handle; 933. an air exhaust pipe; 934. a foot seat; 935. a flow baffle plate; 9351. a flow guide way; 936. a collection box; 9361. a flow guide pipe; 9362. an electromagnetic valve; 937. a filtering net cover; 9371. a card holder; 9372. a magnet piece; 94. a second clean water tank; 95. and a third clean water tank.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

The embodiment of the application discloses a chromium plating production line. Referring to fig. 1, a chromium plating production line includes preceding washing group in proper order, electroplating bath 9 and back washing group, between preceding washing group and the electroplating bath 9, all be provided with stoving pond 92 between electroplating bath 9 and the back washing group, preceding washing group includes solution washing pond 90 and first clean water basin 91 in proper order, back washing group includes second clean water basin 94 and third clean water basin 95, set up supersonic generator in the third clean water basin 95, supersonic generator's theory of use is prior art, no longer describe herein. A drying pool 92 is arranged on one side of the third clean water pool 95 far away from the second clean water pool 94; still including erectting the guide rail 2 in electroplating cell 9 top, guide rail 2 is washd pond 90 by the solution and extends towards third clean water basin 95, and slide on guide rail 2 and be provided with portal frame 1, and portal frame 1 is gone up to hang and is equipped with the lifter 3 that is used for hanging the work piece of waiting to plate, and is provided with the lift drive subassembly 4 of 3 elevating movement of drive lifter on the portal frame 1, and this application embodiment uses the rack to plate as the example, adopts conventional electroplating hanger, no longer gives details here.

Referring to fig. 2 and 3, the bottom surface of the guide rail 2 is sequentially and fixedly supported with a plurality of support legs 23 supporting the guide rail 2 above the rack plating tank along the length direction thereof, the portal frame 1 comprises a hoisting beam 10 horizontally arranged between the two guide rails 2 and a support rod 11 longitudinally and fixedly connected with the two ends of the hoisting beam 10, the bottom end of the support rod 11 is fixed with a traveling shell 12 moving along the guide rail 2, a traveling gear 13 is rotatably arranged in the traveling shell 12, the top surface of the guide rail 2 is provided with a guide rack 21 engaged with the traveling gear 13 along the extending direction thereof, the side wall of the traveling shell 12 is provided with a traveling driving component 5 driving the traveling gear 13 to rotate, and the left and right back side walls of the traveling shell 12 are provided with guide limit components limiting the traveling shell 12 from the guide rails 2. An operator drives the walking driving assembly 5 to drive the walking gear 13 to move along the guide rack 21 on the guide rail 2 in a meshing transmission manner, and meanwhile, the guide limiting assembly limits the walking shell 12 to be separated from the guide rail 2, so that the portal frame 1 integrally moves along the two guide rails 2.

Referring to fig. 3 and 4, a lifting rod 3 is vertically hung between two support rods 11 on the bottom surface of a hoisting beam 10, the lifting rod 3 is horizontally arranged above an electroplating pool 9, two ends of the lifting rod 3 in the length direction are provided with lifting hooks 30 for hooking a workpiece to be hoisted, and one end of the hoisting beam 10 above a walking drive assembly 5 is provided with a lifting drive assembly 4 for driving the lifting rod 3 to move up and down; the relative hook of lifting hook 30 on operating personnel through the lifting rod 3 hoists and treats the electroplating work piece, drive walking drive assembly 5 drives walking gear 13 and rotates, drive lifting rod 3 elevating movement through drive lifting drive assembly 4, thereby it moves along guide rail 2 to drive treating the electroplating work piece of hoist and mount on the lifting rod 3 in a flexible way, go up and down, when portal frame 1 need only to stop, stop walking drive assembly 5, walking gear 13 meshes guide rack 21 and chucking, thereby be favorable to the rapid stabilization to stop portal frame 1, reduce that portal frame 1 transportation process takes place inertial drift when stopping, improve the efficiency that portal frame 1 stably aligns electroplating bath 9.

Referring to fig. 2 and 3, a limit groove 20 is formed in the top surface of the guide rail 2 along the extending direction of the guide rail, a guide rack 21 is fixed to the bottom wall of the limit groove 20, two opposite tooth surfaces of the lower portion of the traveling gear 13 are attached to opposite side walls of the limit groove 20, two opposite side walls of the guide rail 2 are respectively provided with a guide groove 22 along the extending direction of the guide rail, the guide limit assembly comprises a pair of guide wheels 14 rotatably arranged on two opposite side walls of the traveling shell 12, the rotating centers of the pair of guide wheels 14 are vertically downward and correspond to the two guide grooves 22 one by one, and the wheel surfaces of the guide wheels 14 are attached to the bottom wall of the corresponding guide grooves 22; the walking driving assembly 5 is arranged on the side wall of one walking shell 12, two walking gears 13 are respectively arranged in the walking shells 12 at two sides along the length direction of the guide rail 2, the walking driving assembly 5 is correspondingly arranged on the walking shells 12 in two groups, the walking driving assembly 5 comprises a first speed reducer 51 fixed on the side wall of the walking shell 12, which deviates from the electroplating pool 9, and a walking motor 50 in transmission connection with the first speed reducer 51, the output end of the first speed reducer 51 is fixedly connected with the walking gears 13 with the same axle center, the walking gears 13 at two opposite sides are fixedly connected with a synchronizing axle 18 with the same axle center to realize the synchronous rotation of the walking gears 13 at two sides of the electroplating pool 9, meanwhile, a connecting rod 19 is fixedly butted between the walking shells 12 at two sides to enhance the integrity, an operator drives the two walking motors 50 at one side and the first speed reducer 51 to drive the walking gears 13 to rotate along the guide rail 2, a limiting groove 20 limits the moving direction of the walking gears 13 to reduce the possibility that the walking gears 13 are separated from the guide rack 21, the pair of guide wheels 14 relatively clamp the opposite side walls of the guide rail 2 and roll and guide along the guide grooves 22, so that the stability of the traveling shell 12 moving along the guide rail 2 is further improved, and the stability of the whole traveling of the portal frame 1 is improved.

Referring to fig. 3 and 4, the lifting driving assembly 4 includes a second reducer 45 fixed on the lifting beam 10 and located on the traveling motor 50, and a first lifting motor 40 in transmission connection with the second reducer 45, a cavity 100 is axially arranged in the lifting beam 10, a rotating rod 41 penetrating into the cavity 100 is fixedly connected with the power output end of the second reducer 45 coaxially, the rotating rod 41 is rotatably connected with two ends of the lifting beam 10 along the length direction of the lifting beam 10, a plurality of winding rollers 42 are axially fixed on the rod wall of the rotating rod 41, in this embodiment, two winding rollers 42 are provided, a hanging strip 43 is wound on the winding rollers 42, a plurality of rotating bearings 44 for rotatably connecting the rotating rod 41 are fixed in the cavity 100 on the lifting beam 10, the hanging strip 43 vertically extends out of the cavity 100 and is connected with the lifting rod 3, an operator drives the first lifting motor 40 to drive the rotating rod 41 to rotate, so that the hanging strip 43 can be wound and unwound on the corresponding winding rollers 42, thereby driving the lifting rod 3 to vertically lift and is beneficial to quickly and stably lifting and hoisting the workpiece by the lifting rod 3.

Referring to fig. 2 and 3, an oil spraying shell 6 is arranged on the top surface of the traveling shell 12 above the traveling gear 13, the longitudinal section of the whole oil spraying shell 6 is arc-shaped, the inner arc surface of the oil spraying shell 6 is matched with the traveling gear 13, a plurality of oil spraying nozzles 60 are arranged on the inner arc surface of the oil spraying shell 6 facing the traveling gear 13 along the circumferential direction of the top of the traveling gear 13, an oil storage box 61 is fixed on the top surface of the traveling shell 12 above the oil spraying shell 6, an air pump 62 connected with the oil storage box 61 is fixed on the top surface of the oil storage box 61, a limit switch 63 is arranged at one end of the guide rail 2 facing the traveling shell 12, and the limit switch 63 is in control connection with the air pump 62; an operator stores lubricating oil in the oil storage box 61 in advance, a glass observation hole is formed in the wall of the oil storage box 61 to facilitate checking of the residual amount of the lubricating oil in the oil storage box 61, after the operator drives the portal frame 1 to reciprocate once along the guide rail 2, portal frame 1 moves to the one end of guide rail 2, walking shell 12 touches limit switch 63 and starts air pump 62, air pump 62 aerifys towards in the oil storage box 61, make oil storage box 61 spray lubricating oil by fuel sprayer 60 towards walking gear 13, be favorable to in time carrying out oil lubrication to walking gear 13, reduce walking gear 13 and spacing groove 20's wearing and tearing, and with guide rack 21 meshing wearing and tearing, improve the protection to walking gear 13, guide rail 2 and guide rack 21, reduce the noise that walking gear 13 walking in-process produced because too big mechanical friction, limit switch 63 improves the timeliness and the convenience of lubricated walking gear 13.

Referring to fig. 3 and 4, the opposite surfaces of the two support rods 11 are longitudinally provided with lifting grooves 111, two axial ends of the lifting rod 3 are fixed with sliders 34 sliding along the lifting grooves 111, in the embodiment of the present application, the cross section of the lifting groove 111 is T-shaped, the sliders 34 are fitted with the inner wall of the lifting grooves 111, the top end wall of the lifting groove 111 is fixed with a lubricating sponge 15, the outer side wall of the support rod 11, which is located at one side of the lubricating sponge 15, is fixed with an oil delivery box 16, the top surface of the oil delivery box 16 is fixed with an oil pump 17, the pumping end of the oil pump 17 is connected with the inside of the oil delivery box 16 through a conduit, and the pumping end of the oil pump 17 penetrates into the lifting grooves 111 through a conduit and is connected with the lubricating sponge 15; when an operator drives the lifting motor 40 to drive the lifting rod 3 to perform lifting motion, the two ends of the lifting rod 3 slide along the corresponding lifting groove 111 by means of the corresponding sliding blocks 34, the lifting groove 111 is favorable for reducing the shaking deviation of the lifting rod 3 for lifting a lifting workpiece, the lifting stability of the lifting rod 3 is improved, the operator stores lubricating oil in the oil conveying box 16 in advance, the driving oil pump 17 conveys part lubricating oil towards the lubricating sponge 15, when the lifting rod 3 moves to the top end of the lifting groove 111, the sliding blocks 34 extrude the lubricating sponge 15 and extrude the lubricating oil, thereby lubricating the lifting groove 111 and the sliding blocks 34 quickly, the abrasion of the lifting rod 3 and the wall of the lifting groove 111 is favorably reduced, and the mechanical friction noise of the lifting rod 3 to perform lifting motion is reduced.

Referring to fig. 3 and 4, a pressure sensor 7 is fixed on the bottom surface of the rotating bearing 44, a first controller 70 connected with the pressure sensor 7 is fixed on the side surface of the hoisting beam 10, a first warning lamp 71 is fixed on one side of the hoisting beam 10, which is positioned on the first controller 70, and the first controller 70 controls the on and off of the first warning lamp 71 through a lead wire; an operator hoists a batch of workpieces to be electroplated on the lifting rod 3, the rotating rod 41 is connected with the lifting rod 3 in a rotating mode, the rotating bearing 44 supports the rotating rod 41 and the gravity of the workpieces hoisted by the lifting rod 3 and presses down the pressure sensor 7, the operator sets a hoisting gravity upper limit value according to the bearing upper limit value of the rotating rod 41, when the rotating bearing 44 presses down the pressure sensor 7 to the hoisting weight upper limit value, the first controller 70 controls to turn on the first warning lamp 71, so that the operator is prompted to hoist the workpieces to be electroplated in time to reach the upper limit value, the reduction of the overweight hoisting of the excessive workpieces on the lifting rod 3 is facilitated, and the potential safety hazard of hoisting the electroplated workpieces is reduced.

Referring to fig. 2 and 5, two pairs of fixing ear plates 33 are fixed on the top surface of the lifting rod 3 opposite to the hanging ends of the two hanging straps 43, the two pairs of fixing ear plates 33 are in one-to-one correspondence with the two hanging straps 43, the pair of fixing ear plates 33 are oppositely arranged along the length direction of the lifting rod 3, a hanging shaft 31 is fixed between the pair of fixing ear plates 33, the hanging ends of the hanging straps 43 are wound on the hanging shaft 31 and are bent upwards, a fixing clamp 32 is clamped between the hanging section and the bending section of the hanging straps 43 facing the hanging shaft 31, the fixing clamp 32 comprises two clamping plates which are oppositely clamped and locked through bolts, a tension sensor 8 is arranged on the surface of the fixing clamp 32 departing from the hanging straps 43, one end of the tension sensor 8 is hooked with the fixing clamp 32, the other end is connected with the upward bending section of the hanging straps 43, a second controller 80 connected with the tension sensor 8 is fixed on one side of the walking shell 12 located on the walking motor 50, a second warning lamp 81 is fixed on one side of the second controller 80 located on the walking shell 12, the second controller 80 is connected with a lead to control the on and off of the second alarm lamp 81; hanging strip 43 is around establishing on hanging connecting shaft 31 the back, mounting clamp 32 is connected to tension sensor 8 one end, the upwards bending section of hanging strip 43 is connected to the other end, when hanging strip 43 becomes flexible between mounting clamp 32, the one end that tension sensor 8 was connected to hanging strip 43 changes with mounting clamp 32 relative position, tension sensor 8 response pulling force change this moment and in time give second controller 80 with pulling force change signal transport, second controller 80 and then control open warning light two 81, thereby in time indicate operating personnel hanging strip 43 lax and in time consolidate mounting clamp 32, be favorable to improving the security that hanging strip 43 hung lifting rod 3.

Referring to fig. 6 and 7, two opposite waste gas recycling boxes 93 are disposed on the top of the top surface of the electroplating tank 9, the waste gas recycling boxes 93 are disposed along the length direction of the top surface of the electroplating tank 9, the length of each waste gas recycling box 93 is matched with the length of the inner wall of the electroplating tank 9 in the length direction of the opening, a space is reserved between the two waste gas recycling boxes 93, so that an operator can conveniently lift a part to be electroplated into the electroplating tank 9, a plurality of air suction ports 9311 are disposed on the opposite side surfaces of the two waste gas recycling boxes 93 in the length direction, and an air suction port 9315 is disposed at the same end of the two waste gas recycling boxes 93 in the length direction, the air suction port 9315 is connected with an air suction pipe 933 of an external air suction device, during the electroplating process, the external air suction device such as an exhaust fan and an air suction pump works to draw air in the waste gas recycling boxes 93, a negative pressure is formed inside the waste gas recycling boxes 93, and the waste gas rising from the electroplating tank 9 is absorbed by the air suction ports 9311, Acid mist realizes automatic collection of mist pollutants and gas pollutants generated in the electroplating process, and improves the control of the air environment of the electroplating site and the protection of operators.

Referring to fig. 6 and 7, the exhaust gas recovery box 93 includes a box body 931, a box opening 9312 is opened on the top surface of the box body 931, a box cover 932 is covered on the box opening 9312, a circular groove 9313 is opened on the top end of the box body 931 located on the outer side of the box opening 9312 in the circumferential direction, a sealing insert 9321 is fixed on the bottom surface of the box cover 932, the sealing insert 9321 is integrally matched with the circular groove 9313, a sealing sleeve 9322 is sleeved on the sealing insert 9321, the sealing sleeve 9322 can be made of rubber materials, the sealing insert 9321 is inserted into the circular groove 9313 to abut against and seal the circular groove 9313, the sealing performance of the exhaust gas recovery box 93 is improved, the suction force reducing effect of the air suction port 9311 due to the box opening 9312 is reduced, handles 9323 are fixed on both ends of the top surface of the box cover 932 in the length direction, and the box cover 932 is convenient for an operator to open the box cover 932 and clean the inside of the box body 931.

Referring to fig. 6 and 8, the feet 934 are fixed to two sides of the length of the box 931, the lower portion of the box 931 is placed in the electroplating bath 9 and then supported on the electroplating bath 9 through the two feet 934, and an operator locks the feet 934 on the top end of the electroplating bath 9 through screws to fix the box 931.

Referring to fig. 6 and 7, a collecting member is provided in the case 931 toward the suction ports 9311, the collecting member is provided as a flow blocking plate 935, the flow blocking plate 935 is provided along the arrangement direction of the plurality of suction ports 9311, the two ends of the flow baffle 935 in the length direction are attached to the two inner walls of the box 931, the bottom of the flow baffle 935 is fixedly connected to the inner wall of the box 931 below the air suction port 9311, the top of the flow baffle 935 inclines towards the box cover 932, the air suction port 9315 is located at the side of the flow baffle 935 away from the air suction port 9311, a flow guide channel 9351 inclining towards the end of the box 931 far away from the air suction port 9315 is formed on the inner wall of the flow baffle 935 and the box 931, the side wall of the box 931 at the bottom end side of the flow guide channel 9351 is connected with a flow guide pipe 9361, a collecting box 936 is arranged at the side of the electroplating pool 9 far away from the air suction pipe 933, and the other end of the flow guide pipe 9361 is connected with the collecting box 936, an electromagnetic valve 9362 for controlling the conduction tube 9361 to be switched on and off is arranged on the conduction tube 9361; the flow baffle 935 is connected to the inner wall of the housing 931, water mist pollutants such as acid mist and the like enter the waste gas recovery tank 93 through the air inlet 9311 and then are blocked and collected by the flow baffle 935, a large amount of water mist pollutants are collected and flow down onto the flow guide channel 9351, flow to the flow guide pipe 9361 along the inclined direction of the flow guide channel 9351 and flow into the collection box 936, which is beneficial to realizing rapid collection and collection, liquid pollutants are output by diversion, the subsequent centralized treatment of operators is facilitated, the damage to equipment caused by conveying corrosive pollutants such as acid mist to external air extraction equipment is reduced, the air suction port 9311 is directly separated from the air extraction end of the air extraction pipe 933 by the flow baffle 935, the rapid guiding out of the air extraction pipe 933 of water mist pollutants along with the suction effect of the air extraction pipe 933 is reduced, the effect that the flow baffle 935 collects the water mist pollutants such as the acid mist is improved, the electromagnetic valve 9362 facilitates the operators to timely stop the flow guide pipe 9361, and therefore the centralized treatment of waste liquid stored in the collecting box 936 is facilitated.

Referring to fig. 6 and 7, a filter screen 937 is covered on a plurality of air inlets 9311 on the outer wall of the box 931, a clamping groove 9314 is formed in the outer wall of the box 931 above the arrangement direction of the plurality of air inlets 9311 along the length direction of the box 931, in the embodiment of the present application, the cross section of the clamping groove 9314 is T-shaped, the filter screen 937 is hinged to a clamping seat 9371, one side of the clamping seat 9371 away from the filter screen 937 is clamped to the clamping groove 9314, a magnet piece 9372 is fixed on the lower portion of the filter screen 937, and the box 931 can be made of iron and other materials; filter screen panel 937 on the one hand and cover and establish the separation on induction port 9311 and put into electroplating bath 9 part mistake and go into induction port 9311, filter the separation simultaneously by the electroplating solution that the electroplating part that goes up and down splashes, the electroplating solution is gathered and falls electroplating bath 9 once more by filtering screen panel 937, reduce the loss of electroplating solution, operating personnel can install filtering screen panel 937 fast through cassette 9371 joint draw-in groove 9314, can wash filtering screen panel 937 through taking off cassette 9371, improve filtering screen panel 937 dismouting, abluent convenience, magnet piece 9372 adsorbs at the box 931 outer wall, improve the stability that filtering screen panel 937 covers on box 931.

Referring to fig. 9 and 10, in the embodiment of the present application, taking a drying tank 92 which is a rectangular parallelepiped as an example, a tank opening 921 is formed in a top surface of the drying tank 92, and an air injection mechanism 925 externally connected with an air blowing device (not shown in the figure) and an electric heating mechanism 926 arranged at a bottom wall in the drying tank 92 are arranged on four circumferential walls in the drying tank 92; an operator puts the batch of parts subjected to electroplating into the drying pool 92 through the pool port 921 through an external hoisting device, then drives the air blowing device to enable the air blowing mechanism 925 to circumferentially and sequentially spray drying air towards the batch of parts, and simultaneously starts the electric heating and warming mechanism to heat the drying pool 92 to cooperate with the drying air to quickly evaporate residual water on the parts.

Referring to fig. 9 and 10, the bottom wall four corners position vertically is fixed with hack lever 927 respectively in stoving pond 92, the opposite face of two adjacent hack levers 927 is vertically opened relatively and is equipped with spout 9271, slide along two double-phase relative spout 9271 between two adjacent hack levers 927 and be connected with lifter 928, lifter 928 is fixed with connecting block 9285 towards the face of stoving pond 92 inner wall, it is fixed with support 9284 to be located pond mouth 921 department on 92 top of stoving pond, and the top surface of support 9284 is fixed with elevator motor two 9281, the vertical downward coaxial axle center fixedly connected with lead screw 9282 of output of elevator motor two 9281, and lead screw 9282 screw cross-under connecting block 9285, the fixed cover in bottom of lead screw 9282 is equipped with stopper 9283. The air injection mechanism 925 comprises a plurality of spray pipes 9251 which are uniformly arranged along the length direction of the lifting plate 928, the spray pipes 9251 are fixedly connected with the longitudinal plate surface of the lifting plate 928 in a penetrating manner, the spray ends of the spray pipes 9251 in the two opposite sides in the drying pool 92 are opposite, the spray ends of the plurality of spray pipes 9251 deviated from the spray ends of the spray pipes 9251 at the same side are connected with an air inlet pipe 9252 of an external air blower device, and the air inlet pipe 9252 is made of a soft pipe material and is reserved with a reserved length along the longitudinal lifting of the spray pipes 9251 and the lifting plate 928. The operating personnel will treat that the part of drying is put into stoving pond 92 by pond mouth 921 in batches, drive outside air-blast equipment by air-supply line 9252 and a plurality of spray tube 9251 spray the stoving wind towards the part, a plurality of spray tubes 9251 on each inner wall of stoving pond 92 of alternate use in proper order blow to dry by the fire in batches part circumference, drive elevator motor two 9281 simultaneously drives lead screw 9282 and rotates, thereby drive the vertical elevating movement of lifter plate 928 along spout 9271, be favorable to drying and blowing to the part side is vertical even, improve the effect of weathering in batches the part, stopper 9283 is favorable to avoiding lifter plate 928 descending position to hang down low and collision stoving pond 92 inner bottom wall, improve the protection to lifter plate 928.

Referring to fig. 10 and 11, the electrothermal heating mechanism 926 includes a water-proof heat-conducting component fixed on the inner bottom wall of the drying pool 92 in an inclined manner and a plurality of electric heating components fixed on the bottom surface of the water-proof heat-conducting component, the water-proof heat-conducting component is a heat-conducting plate 9262, the heat-conducting plate 9262 is made of a metal material, the electric heating components are electric heating sheets 9261 connected with an external power supply, the electric heating sheets 9261 are sequentially fixed on the bottom surface of the heat-conducting plate 9262 along the inclined direction of the heat-conducting plate 9262, a liquid outlet 922 is formed in the pool wall of the drying pool 92 at one side of the bottom end of the heat-conducting plate 9262, a discharge pipe 923 is connected to the side wall of the drying pool 92 at the liquid outlet 922, and a water valve 924 is arranged on the discharge pipe 923; the operating personnel fixes a plurality of electric heating plate 9261 in heat-conducting plate 9262 bottom surface in advance, then fix heat-conducting plate 9262 at the interior diapire of stoving pond 92, heat-conducting plate 9262 is favorable to a plurality of electric heating plate 9261 heats of quick conduction inside with toasting stoving pond 92, be favorable to cooperating a plurality of spray tubes 9251 to accelerate the evaporation of part surface water stain in batches, the isolated part of heat-conducting plate 9262 drips and drenches the water stain simultaneously, avoid the water stain to drip to drench electric heating plate 9261, improve the protection to electric heating plate 9261, the heat-conducting plate 9262 that the slope set up is favorable to will assembling the drip trickle on heat-conducting plate 9262 fast and is got rid of the stoving case by liquid outlet 922, reduce heat loss that the water body caused is piled up to heat-conducting plate 9262 evaporation face, raise the interior intensification efficiency of stoving pond 92, discharge pipe 923 cooperation water valve 924 convenient to use nimble control stoving pond 92 in water body discharges or ends, make things convenient for operating personnel freely to guide.

Referring to fig. 10 and 11, four inner side walls of the drying pool 92 are inclined downwards from the opening end of the pool port 921 and face the center of the bottom surface of the drying pool 92, a guide pipe 929 externally connected with an air injection device (not shown in the figure) is arranged at the end of the drying pool 92, which is positioned at the pool port 921, along the length direction of the inner side wall of the drying pool 92, a plurality of spray heads 9291 are arranged on the guide pipe 929 along the self axial direction, the injection direction of the plurality of spray heads 9291 is parallel to the inclined direction of the inner side wall of the drying pool 92, the inclined downwards inner side wall of the drying pool 92 conveniently and quickly guides water stains blown off from parts, the water stains blown off the parts are favorably and quickly collected in the drying pool 92, an operator drives the external air injection device to inject air downwards from the plurality of spray heads 9291 along the inner wall of the drying pool 92, and is favorable for accelerating the collection of the water stains adhered to the bottom of the drying pool 92 to the bottom surface of the drying pool 92, simultaneously a plurality of shower nozzles 9291 accelerate the inside air flow of stoving pond 92, improve part drying efficiency.

The embodiment of the application also discloses a chromium plating production process.

S1, hanging: hanging the processed workpiece on two lifting hooks 30 of the lifting rod 3, and driving a walking motor 50 and a first lifting motor 40 to move the lifting rod 3 and the workpiece to be above a first solution cleaning pool 90;

s2, acid washing activation: adding sodium chloride with solution components of 50g/L, 37% hydrochloric acid with solution components of 100g/L and ferrous chloride with solution components of 150g/L into the first solution cleaning pool 90, wherein the temperature is 20-30 ℃, the current density is 2-6A/dm, and driving the lifting motor I40 to lower the lifting rod 3 and enable the workpiece to be placed into the first solution cleaning pool 90 for 1-2 min;

s3, washing: driving a walking motor 50 and a first lifting motor 40 to transfer the portal frame 1 and the lifting rod 3 into a first clean water tank 91, and washing with water at least twice, wherein cold water and hot water can be used for alternately washing;

s4, drying: driving a walking motor 50 and a first lifting motor 40 to enable the portal frame 1 and the lifting rod 3 to lift the workpiece out of the first clean water tank 91 and transfer the workpiece into a drying tank 92, drying and blowing the workpiece through an air injection mechanism 925, and simultaneously connecting a plurality of electric heating plates 9261 to bake the workpiece;

s5, hexavalent chromium electroplating: driving a traveling motor 50 and a first lifting motor 40 to enable the portal frame 1 and the lifting rod 3 to transfer the workpiece into the electroplating pool 9, wherein the electroplating solution is 200 and 250g/L of chromic anhydride and 2-5g/L of sulfuric acid, and a power supply of the electroplating pool 9 is connected, the current density is 20A/dm, and the temperature is 45 ℃;

s6, drying: driving a traveling motor 50 and a first lifting motor 40 to lift the workpieces out of the electroplating pool 9 and transfer the workpieces into a drying pool 92 by the portal frame 1 and the lifting rod 3, drying the workpieces by an air injection mechanism 925, and simultaneously connecting a plurality of electric heating plates 9261 to bake the workpieces;

s7, washing: driving a traveling motor 50 and a first lifting motor 40 to transfer the workpieces to a second clean water tank 94 for washing by the gantry 1 and the lifting rod 3;

s8, ultrasonic water washing: driving a walking motor 50 and a first lifting motor 40 to transfer the workpieces to a third clean water tank 95 by the portal frame 1 and the lifting rod 3, and cleaning the workpieces by matching with an ultrasonic generator;

s9, drying: driving a traveling motor 50 and a first lifting motor 40 to lift the workpieces out of a third clean water tank 95 and transfer the workpieces into a drying tank 92 by a portal frame 1 and a lifting rod 3, drying the workpieces by an air injection mechanism 925, and simultaneously connecting a plurality of electric heating plates 9261 to bake the workpieces;

s10, unloading and checking; manually lowering the lifting rod 3, detaching the dried workpiece, and inspecting the surface uniformity of the electroplated workpiece;

and S11, packaging the workpieces which are finished by electroplating in batches and qualified by inspection.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A chromium plating production line is characterized in that: the device comprises a front cleaning pool group, an electroplating pool (9) and a rear cleaning pool group in sequence, wherein drying pools (92) are arranged between the front cleaning pool group and the electroplating pool (9) and between the electroplating pool (9) and the rear cleaning pool group;

the front cleaning pool group sequentially comprises a solution cleaning pool (90) and a first clean water pool (91), and the rear cleaning pool group comprises a second clean water pool (94) and a third clean water pool (95);

a waste gas recovery box (93) for absorbing electroplating waste gas is oppositely arranged at the mouth end of the electroplating pool (9);

an air injection mechanism (925) externally connected with a blower device and an electric heating mechanism (926) used for heating the drying pool (92) are arranged in the drying pool (92);

the air injection mechanism (925) comprises a plurality of spray pipes (9251) which are oppositely arranged on the inner wall of the drying pool (92), the spray pipes (9251) on the same side are connected with an air inlet pipe (9252) for externally connecting air blowing equipment, the electric heating mechanism (926) comprises a plurality of electric heating parts which are arranged on the inner wall of the drying pool (92), and water-proof heat-conducting parts are covered on the electric heating parts in the drying pool (92);

also comprises a guide rail (2) arranged above the front cleaning pool group, the guide rail (2) extends from the front cleaning pool group to the rear cleaning pool group, a portal frame (1) is arranged on the guide rail (2) in a sliding manner, a traveling shell (12) moving along the guide rail (2) is fixed at the lower part of the portal frame (1), a traveling gear (13) is rotationally arranged in the traveling shell (12), and a guide rack (21) meshed with the walking gear (13) is arranged on the guide rail (2) along the extending direction of the guide rail, a walking driving component (5) for driving the walking gear (13) to rotate is arranged on the walking shell (12), a lifting rod (3) for hanging a workpiece to be plated is hung on the portal frame (1), a lifting driving component (4) for driving the lifting rod (3) to move up and down is arranged on the portal frame (1);

a limiting groove (20) is formed in the top surface of the guide rail (2) along the extending direction of the guide rail, the guide rack (21) is fixed to the bottom wall of the limiting groove (20), the lower portion of the walking gear (13) is attached to the opposite groove side wall of the limiting groove (20), the walking driving assembly (5) comprises a walking motor (50) fixed to the side wall of the walking shell (12), and the output end of the walking motor (50) is fixedly connected with the walking gear (13) in a coaxial mode;

guide grooves (22) are respectively formed in two opposite side walls of the guide rail (2) along the extending direction of the guide rail, guide wheels (14) are rotatably arranged on the two opposite side walls of the walking shell (12), a pair of the guide wheels (14) corresponds to the two guide grooves (22) one by one, and wheel surfaces of the pair of the guide wheels (14) are relatively attached to the bottom walls of the corresponding guide grooves (22);

the portal frame (1) comprises a hoisting beam (10) and support rods (11) which are longitudinally and fixedly connected with two ends of the hoisting beam (10);

a cavity (100) is axially arranged in the hoisting beam (10) along the self-body, the lifting driving assembly (4) comprises a first lifting motor (40) fixed at one end of the hoisting beam (10), the output end of the first lifting motor (40) is fixedly connected with a rotating rod (41) with the same axis, the rotating rod (41) is rotatably connected in the cavity (100) along the length direction of the hoisting beam (10), a plurality of winding rollers (42) are axially fixed on the rod wall of the rotating rod (41), and a hanging strip (43) used for hanging the hoisting rod (3) is wound on each winding roller (42);

opposite surfaces of the two support rods (11) are longitudinally provided with lifting grooves (111), two ends of the lifting rod (3) slide along the lifting grooves (111), one end, located on the hoisting beam (10), of each lifting groove (111) is fixedly provided with a lubricating sponge (15), the side wall of each support rod (11) is fixedly provided with an oil conveying box (16), each oil conveying box (16) is provided with an oil pump (17), the extraction end of each oil pump (17) is connected with the corresponding oil conveying box (16), and the extraction end of each oil pump (17) is connected with the corresponding lubricating sponge (15);

an oil spraying shell (6) is arranged on the walking shell (12) and above the walking gear (13), an oil nozzle (60) used for spraying lubricating oil towards the walking gear (13) is arranged on the oil spraying shell (6), an oil storage box (61) is arranged on the walking shell (12), an air pump (62) connected with the oil storage box (61) is arranged on the oil storage box (61), a limit switch (63) is arranged at one end of the guide rail (2) towards the walking shell (12), and the limit switch (63) is in control connection with the air pump (62);

a plurality of rack rods (927) are longitudinally erected in the drying pool (92), two adjacent rack rods (927) are arranged along the length direction of the inner wall of the drying pool (92), sliding grooves (9271) are respectively formed in opposite surfaces of two adjacent rack rods (927) along the axial direction of the rack rods, a lifting plate (928) is connected between the two adjacent rack rods (927) in a sliding mode along the sliding grooves (9271), and a plurality of spray pipes (9251) are arranged on the lifting plate (928);

a second lifting motor (9281) is fixed on the drying pool (92) positioned on the pool opening (921), the output end of the second lifting motor (9281) is vertically downward and is fixedly connected with a screw rod (9282) coaxially, the lifting plate (928) is in threaded connection with the screw rod (9282), and a limit block (9283) is fixedly sleeved at one end, facing the inner bottom wall of the drying pool (92), of the screw rod (9282);

the inside wall in stoving pond (92) by pond mouth (921) open end slope is downward, just the inside wall in stoving pond (92) from top to bottom slope is inwards, stoving pond (92) are located pond mouth (921) end is followed the inside wall length direction in stoving pond (92) is provided with pipe (929) that are used for external jet-propelled equipment, pipe (929) are gone up and are provided with a plurality of shower nozzles (9291) along self axial, and a plurality of the injection direction of shower nozzle (9291) is on a parallel with the inside wall incline direction in stoving pond (92).

2. The chrome plating production line according to claim 1, characterized in that: the lifting beam (10) is located in the cavity (100), a plurality of rotating bearings (44) for the rotating rods (41) to be rotatably connected are fixed in the cavity, a pressure sensor (7) is fixed on a supporting surface of each rotating bearing (44), a first controller (70) connected with the pressure sensor (7) is fixed on the lifting beam (10), and a first warning lamp (71) electrically connected with the first controller (70) is fixed on the rod wall of the lifting beam (10).

3. The chrome plating production line according to claim 1, characterized in that: a hanging shaft (31) is fixed on the lifting rod (3), one end of the hanging strip (43) which is wound out of the rotating rod (41) is wound on the hanging shaft (31), and a fixing clamp (32) used for clamping the belt section of the hanging belt (43) wound into the hanging connecting shaft (31) and the belt section of the hanging belt (43) wound out of the hanging connecting shaft (31) is clamped on the hanging belt (43), a tension sensor (8) is arranged on the fixing clamp (32), one end of the tension sensor (8) is connected with the fixing clamp (32), the other end is connected with the strap (43) and wound out of the strap section of the hanging shaft (31), a second controller (80) connected with the tension sensor (8) is arranged on the walking shell (12), and a second warning lamp (81) electrically connected with the second controller (80) is arranged on the walking shell (12).

4. The chrome plating production line according to claim 1, characterized in that: electric heating member sets up to electric heating plate (9261), water proof heat-conducting member sets up to heat-conducting plate (9262), heat-conducting plate (9262) sets up the interior diapire of stoving pond (92), and a plurality of electric heating plate (9261) is fixed heat-conducting plate (9262) orientation on the face of stoving pond (92) interior diapire, heat-conducting plate (9262) slope sets up the interior diapire of stoving pond (92), just stoving pond (92) are located liquid outlet guide (922) have been seted up to the pool wall of heat-conducting plate (9262) bottom one side, the lateral wall of stoving pond (92) is located be connected with discharge pipe (923) on liquid outlet guide (922), just be provided with water valve (924) on discharge pipe (923).

5. The chrome plating production line according to claim 1, characterized in that: a space for placing an electroplating workpiece into an electroplating pool (9) is reserved between the two opposite waste gas recovery boxes (93), a plurality of air suction ports (9311) are formed in the opposite side surfaces of the two opposite waste gas recovery boxes (93), and the waste gas recovery boxes (93) are connected with air suction pipes (933) of external air suction equipment;

a collecting part for accumulating acid mist is arranged in the waste gas recovery tank (93) towards the air suction port (9311), a collecting box (936) for collecting the acid mist accumulated on the collecting part is arranged on one side of the waste gas recovery tank (93), the collecting part is arranged as a flow baffle plate (935), the flow baffle plate (935) is arranged along the arrangement direction of the air suction ports (9311), the bottom of the flow baffle plate (935) is fixedly connected to the inner wall of the waste gas recovery tank (93) below the air suction ports (9311), and the top of the flow baffle plate (935) is inclined towards the top of the waste gas recovery tank (93);

the inner walls of the flow baffle plate (935) and the waste gas recovery box (93) are provided with a flow guide channel (9351) inclined towards one side of the waste gas recovery box (93), the waste gas recovery box (93) is positioned at one side of the bottom end of the flow guide channel (9351) and is connected with a flow guide pipe (9361), the other end of the flow guide pipe (9361) is connected with the collection box (936), and the connecting end of the exhaust pipe (933) and the waste gas recovery box (93) is positioned at one side of the flow baffle plate (935) deviating from the air suction port (9311).

6. The chrome plating production line according to claim 5, characterized in that: the waste gas recovery box (93) comprises a box body (931) and a box cover (932) covered on the top surface of the box body (931), the top surface of the box body (931) is provided with a box opening (9312), and a ring groove (9313) is arranged at the top end of the box body (931) and positioned at the box opening (9312) in the circumferential direction, a sealing insert block (9321) for inserting the ring groove (9313) is fixed on the surface of the box cover (932) facing the box opening (9312), a filtering screen cover (937) is covered on the plurality of air suction ports (9311) on the outer wall of the box body (931), a clamping groove (9314) is arranged on the outer wall of the box body (931) above the arrangement direction of the plurality of air suction ports (9311), the filter screen cover (937) is hinged with a clamping seat (9371) used for clamping the clamping groove (9314), one side of the filter screen (937) far away from the hinged end of the filter screen is fixed with a magnet piece (9372) used for adsorbing the outer wall of the box body (931).

7. A chromium plating production process using a chromium plating production line as defined in any one of claims 1 to 6, characterized in that: the method comprises the following steps:

s1, hanging: hanging the processed workpiece on a lifting rod (3), and driving a portal frame (1) and the lifting rod (3) to move to the position above a first solution cleaning pool (90);

s2, acid washing activation: adding 50g/L sodium chloride, 100 g/L37% hydrochloric acid and 150g/L ferrous chloride into a first solution cleaning pool (90), lowering a lifting rod (3) and placing a workpiece into the first solution cleaning pool (90) at the temperature of 20-30 ℃ and the current density of 2-6A/dm for 1-2 min;

s3, washing: driving the portal frame (1) and the lifting rod (3) to transfer the workpiece into a first clean water tank (91), and washing at least twice;

s4, drying: driving a portal frame (1) and a lifting rod (3) to transfer the workpiece into a drying pool (92), drying and blowing the workpiece through an air injection mechanism (925), and simultaneously switching on an electric heating mechanism (926) to bake the workpiece;

s5, hexavalent chromium electroplating: the driving portal frame (1) and the lifting rod (3) transfer the workpiece into the electroplating pool (9), the components of the electroplating solution are 200 and 250g/L chromic anhydride and 2-5g/L sulfuric acid, the current density is 20A/dm, and the temperature is 45 ℃;

s6, drying: as with S4;

s7, washing: driving the portal frame (1) and the lifting rod (3) to transfer the workpiece into a second clean water tank (94) for washing;

s8, ultrasonic water washing: the portal frame (1) and the lifting rod (3) are driven to transfer the workpiece into a third clean water tank (95), and the workpiece is cleaned by matching with an ultrasonic generator;

s9, drying: as with S4;

s10, unloading and checking;

and S11, packaging.