CN113136613A

CN113136613A - Stainless steel fastener surface treatment device and process

Info

Publication number: CN113136613A
Application number: CN202110684971.2A
Authority: CN
Inventors: 张坤; 夏满满; 邹小二
Original assignee: Zhongyida Metal Technology Changzhou Co ltd
Current assignee: Zhongyida Metal Technology Changzhou Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-07-20
Anticipated expiration: 2041-06-21
Also published as: CN113136613B

Abstract

The invention relates to the technical field of machining, and discloses a stainless steel fastener surface treatment device which comprises a main body assembly, a sealing assembly and a connecting assembly, wherein the main body assembly comprises an outer box body and an inner box body, the inner box body is fixedly arranged at the center of the bottom of the inner wall of the outer box body, a storage battery is fixedly arranged inside the inner box body, a mounting groove is formed in the top of the inner box body, the sealing assembly is arranged inside the mounting groove, partition plates are fixedly arranged on the side surfaces of the inner box body, the four partition plates are distributed in an annular array mode around the center of the inner box body, one side surface of each partition plate is fixedly connected with the inner wall of the outer box body, the four partition plates divide a gap between the outer box body and the inner box body into four electrolytic cells, and a top cover seals the electrolytic cells, so that harmful gas cannot be inhaled by workers to cause harm, the ventilation assembly sucks out the gas in the closed device.

Description

Stainless steel fastener surface treatment device and process

Technical Field

The invention relates to the technical field of machining, in particular to a stainless steel fastener surface treatment device.

Background

Electroplating is a process of plating a thin layer of other metals or alloys on the surface of some metals by using the principle of electrolysis, and is a process of attaching a layer of metal film on the surface of a metal or other material product by using the action of electrolysis so as to prevent the oxidation of the metals, such as corrosion, improve the wear resistance, the conductivity, the light reflection property and the corrosion resistance, and improve the appearance.

The existing electroplating device can generate harmful gas due to reasons such as electrolyte electrolysis and the like when being coated, a worker needs to watch the condition of the coating nearby the electrolysis device, the coating device is lack of gas generating treatment equipment, and the harmful gas can harm the body of the worker.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a stainless steel fastener surface treatment device which has the advantages of a sealing device and harmful gas discharge, and solves the problem that the harmful gas cannot be treated.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a stainless steel fastener surface treatment device comprises a main body assembly, a sealing assembly and a connecting assembly;

the main body assembly comprises an outer box body and an inner box body, the outer box body and the inner box body are both cylindrical, the inner box body is fixedly installed at the center of the bottom of the inner wall of the outer box body, a storage battery is fixedly installed inside the inner box body, an installation groove is formed in the top of the inner box body, a sealing assembly is arranged at the top of the inner box body, partition plates are fixedly installed on the side surfaces of the inner box body, the four partition plates are arranged and distributed in an annular array mode around the center of the inner box body, one side surface of each partition plate is fixedly connected with the inner wall of the outer box body, and the four partition plates divide a gap between the outer box body and the inner box body into four electrolytic cells;

the outer surface of the inner box body is fixedly provided with a first electrode plate, the inner wall of the outer box body is fixedly provided with a second electrode plate, the number of the first electrode plates and the number of the second electrode plates are four, and the four first electrode plates and the four second electrode plates are in one-to-one correspondence and are respectively arranged in four electrolytic cells;

the sealing assembly comprises a motor, a rotary table, a hydraulic cylinder and a top cover, the motor is fixedly arranged in the mounting groove, an output shaft of the motor is rotatably connected with the center of the bottom of the rotary table, the lower surface of the rotary table is rotatably connected with the upper surface of the inner box body, the center of the top of the rotary table is fixedly provided with the hydraulic cylinder, the telescopic end of the hydraulic cylinder is fixedly connected with the center of the bottom of the top cover, the top of the top cover is provided with a ventilation assembly, the lower surface of the top cover is provided with four groups of connecting assemblies, and the positions of the four groups of connecting assemblies correspond to the positions of the four electrolytic cells;

the connecting assembly comprises a fixed block and a connecting piece, the top of the fixed block is fixedly connected with the bottom of the top cover, the bottom of the fixed block is provided with the connecting piece, the connecting piece is divided into a first connecting rod and a second connecting rod, the top end of the first connecting rod is fixedly connected with the bottom of the fixed block, the bottom end of the first connecting rod is rotatably connected with the top end of the second connecting rod through a rotating shaft, the bottom end of the second connecting rod is fixedly provided with a hook, and an opening of the hook faces towards the hydraulic cylinder;

a connecting ring is fixedly mounted on one side face of the second connecting rod and fixedly connected with one end of a connecting rope, the connecting rope is arranged on the lower surface of the top cover, the other end of the connecting rope is fixedly connected with a connecting block, and the connecting block is fixedly mounted on the upper surface of the rotary table.

Preferably, the last fixed surface of carousel installs protection device, protection device includes outer safety cover and interior safety cover, outer safety cover and interior safety cover are cylindrically, the bottom of outer safety cover and the last fixed surface of carousel are connected, the holding tank has been seted up at the top of outer safety cover, the bottom of interior safety cover is pegged graft in the inside of holding tank, the top of interior safety cover and the lower fixed surface of top cap are connected.

Preferably, the height of the inner protection cover is larger than the length of the telescopic end of the hydraulic cylinder, and the hydraulic cylinder is arranged in the protection device.

Preferably, the ventilation assembly comprises a three-way pipe, a connecting pipe and an air fan, the top cover is penetrated through the two ends of the bottom of the three-way pipe, the two ends of the bottom of the three-way pipe are arranged outside the protection device, a bearing is sleeved outside one end of the top of the three-way pipe, sliding blocks are fixedly arranged on the left side surface and the right side surface of the outer ring of the bearing, one end of the top of the three-way pipe is arranged inside the connecting pipe, sliding grooves are formed in the left side surface and the right side surface of the inner wall of the connecting pipe, the sliding blocks are connected inside the sliding grooves in a sliding mode, the air fan is fixedly arranged.

Preferably, the top cover is cylindrical, the bottom of the top cover is through, the bottom of the top cover is provided with a connecting groove, the top of the outer box is provided with a closed ring, and the closed ring is inserted into the connecting groove.

Preferably, the lower surface of fixed block and the side that the fixed block is close to protection device have all seted up the through-hole, the other end of connecting the rope runs through the through-hole, just the other end of connecting the rope runs through interior safety cover.

Preferably, the bottom fixed mounting of top cap has the limiting plate, the inside cavity of limiting plate, the one end of limiting plate is linked together with a side of fixed block, connect the rope and set up in the inside of limiting plate, a side fixed mounting of fixed block inner wall has first pulley, the bottom fixed mounting of top cap has the second pulley, the second pulley sets up in the other end of limiting plate, connect rope sliding connection in the surface of first pulley and second pulley, it is wire rope to connect the rope.

A surface treatment process for a stainless steel fastener comprises the following steps:

s1, derusting by fasteners: before the fastener is placed in an electrolytic cell, rust removing work is carried out in an external container, firstly, oil dirt and impurities on the surface of the fastener are cleaned by using a sodium stearate aqueous solvent, then, the surface of the fastener is subjected to rust removing by using a solvent with the mass ratio of hydrochloric acid to hexamethylenetetramine to sodium dodecyl benzene sulfonate to triethanolamine to sodium chloride to water of 10:3:5:1:1:20, and the fastener is cleaned by using clean water after rust removing.

S2, electroplating:

1. starting a hydraulic cylinder to lift the top cover, wherein the connecting ropes connected with the four connecting blocks respectively drive second connecting rods in the four connecting pieces to rotate, the second connecting rods lift the hook from the electrolytic cell, a worker hangs the cleaned fastener on the hook, and then the hydraulic cylinder is started to move the top cover downwards so that the hook returns to the interior of the dibbling cell;

2. the electrolytic cells are divided into four electrolytic cells, wherein the electrolytic materials of the two electrolytic cells are trivalent black zinc and black zinc-nickel alloy respectively, the first electrode plate and the second electrode plate are electrified by using a storage battery, and the fastener is positioned at the second electrode plate to start electroplating;

3. the other two electrolytic baths are standby baths, single metal or alloy is placed in the standby baths or clad layer electroplating is carried out, after the fasteners are electroplated in one standby bath, the hydraulic cylinder lifts the top cover to enable the fasteners to be separated from the electrolytic baths, the motor rotates the rotary table to enable the fasteners to rotate to the upper side of the other standby bath, the telescopic end of the hydraulic cylinder descends again, and the fasteners enter the electrolytic baths to carry out the other layer of electroplating.

S3, detection: after the fastener passes through the electrolytic cell coating, the fastener is taken down from the hook and is placed into a special salt spray detection device for salt spray test, wherein the trivalent black zinc electroplating layer needs 96 hours of salt spray, and the black zinc-nickel alloy needs 500 hours of salt spray.

(III) advantageous effects

Compared with the prior art, the invention provides a stainless steel fastener surface treatment device, which has the following beneficial effects:

according to the invention, the electrolytic cell is sealed by arranging the top cover, so that harmful gas cannot be sucked by workers to cause harm, the hydraulic pump controls the top cover to ascend and descend, the ventilation assembly sucks out the gas in the sealed device, and the motor can rotate the top cover, so that the hook drives the fastening piece to enter different electrolytic cells to perform multilayer coating work, and different process requirements are met.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of the main assembly of the present invention;

FIG. 3 is a front sectional view of the connecting assembly of the present invention;

FIG. 4 is a schematic top view of the protection device of the present invention;

fig. 5 is a front sectional structural view of the ventilation assembly of the present invention.

In the figure:

1. a body assembly; 11. an outer case; 12. an inner box body; 121. mounting grooves; 13. a partition plate; 14. a storage battery; 15. a first electrode plate; 16. a second electrode plate; 17. an electrolytic cell; 18. a closed ring;

2. a closure assembly; 21. a motor; 22. a turntable; 23. a hydraulic cylinder; 24. a protection device; 241. an outer protective cover; 242. an inner protective cover; 25. a top cover; 26. connecting grooves; 27. connecting blocks;

3. a connecting assembly; 31. a fixed block; 311. a first pulley; 32. a connecting member; 321. a first connecting rod; 322. a second connecting rod; 33. a rotating shaft; 35. a connecting ring; 36. connecting ropes; 37. hooking; 38. a limiting plate; 39. a second pulley;

4. a ventilation assembly; 41. a three-way pipe; 42. a bearing; 43. a slider; 44. a connecting pipe; 45. a chute; 46. an air fan.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a surface treatment device for stainless steel fasteners comprises a main body component 1, a sealing component 2 and a connecting component 3;

the main body component 1 comprises an outer box body 11 and an inner box body 12, the outer box body 11 and the inner box body 12 are both cylindrical, the inner box body 12 is fixedly installed at the center of the bottom of the inner wall of the outer box body 11, a storage battery 14 is fixedly installed inside the inner box body 12, an installation groove 121 is formed in the top of the inner box body 12, a sealing component 2 is arranged at the top of the inner box body 12, partition plates 13 are fixedly installed on the side surfaces of the inner box body 12, four partition plates 13 are arranged, the four partition plates 13 are distributed around the center of the inner box body 12 in an annular array mode, one side surface of each partition plate 13 is fixedly connected with the inner wall of the outer box body 11, and the four partition plates 13 divide a gap between the outer box body 11 and the inner box body 12 into four electrolytic cells 17;

a first electrode plate 15 is fixedly installed on the outer surface of the inner box body 12, a second electrode plate 16 is fixedly installed on the inner wall of the outer box body 11, four first electrode plates 15 and four second electrode plates 16 are respectively arranged, and the four first electrode plates 15 and the four second electrode plates 16 are in one-to-one correspondence and are respectively arranged inside four electrolytic cells 17; a first electrode plate 15 and a second electrode plate 16 are arranged in each electrolytic cell 17 and are respectively used as a positive electrode and a negative electrode, so that the electrolytic work can normally work;

the sealing assembly 2 comprises a motor 21, a turntable 22, a hydraulic cylinder 23 and a top cover 25, the motor 21 is fixedly mounted inside the mounting groove 121, an output shaft of the motor 21 is rotatably connected with the center of the bottom of the turntable 22, the lower surface of the turntable 22 is rotatably connected with the upper surface of the inner box 12, the hydraulic cylinder 23 is fixedly mounted at the center of the top of the turntable 22, the telescopic end of the hydraulic cylinder 23 is fixedly connected with the center of the bottom of the top cover 25, a ventilation assembly 4 is arranged at the top of the top cover 25, a connecting assembly 3 is arranged at the lower surface of the top cover 25, four groups of the connecting assemblies 3 are arranged on the connecting assembly 3, and the positions of the four groups of the connecting assemblies 3 correspond to the positions of the four electrolytic cells 17;

the connecting assembly 3 comprises a fixed block 31 and a connecting piece 32, the top of the fixed block 31 is fixedly connected with the bottom of the top cover 25, the connecting piece 32 is arranged at the bottom of the fixed block 31, the connecting piece 32 is divided into a first connecting rod 321 and a second connecting rod 322, the top end of the first connecting rod 321 is fixedly connected with the bottom of the fixed block 31, the bottom end of the first connecting rod 321 is rotatably connected with the top end of the second connecting rod 322 through a rotating shaft 33, a hook 37 is fixedly mounted at the bottom end of the second connecting rod 322, and an opening of the hook 37 faces the hydraulic cylinder 23; the hook 37 is used for hooking the fastener, so that the fastener enters or is separated from the electrolytic cell 17 along with the extension and contraction of the hydraulic cylinder 23, and the hook 37 faces to the rotating direction of the second connecting rod 322 to prevent the fastener from being separated when the second connecting rod 322 rotates;

a connecting ring 35 is fixedly mounted on one side surface of the second connecting rod 322, the connecting ring 35 is fixedly connected with one end of a connecting rope 36, the connecting rope 36 is arranged on the lower surface of the top cover 25, the other end of the connecting rope 36 is fixedly connected with a connecting block 27, and the connecting block 27 is fixedly mounted on the upper surface of the turntable 22.

Specifically, the protection device 24 is fixedly mounted on the upper surface of the turntable 22, the protection device 24 includes an outer protection cover 241 and an inner protection cover 242, the outer protection cover 241 and the inner protection cover 242 are both cylindrical, the bottom of the outer protection cover 241 is fixedly connected with the upper surface of the turntable 22, the top of the outer protection cover 241 is provided with a containing groove, the bottom of the inner protection cover 242 is inserted into the containing groove, and the top of the inner protection cover 242 is fixedly connected with the lower surface of the top cover 25; the protection device 24 protects the hydraulic cylinder 23 inside, prevents corrosive gas from damaging the hydraulic cylinder 23 during electrolysis, the inner protective cover 242 moves along with the rising and falling of the top cover 25, the protection device 24 can play a role when the position of the top cover 25 changes, the outer protective cover 241 is connected with the inner protective cover 242 through the accommodating groove, and the joint of the two can not have a large gap so that gas can enter.

Specifically, the height of the inner protection cover 242 is greater than the length of the telescopic end of the hydraulic cylinder 23, and the hydraulic cylinder 23 is arranged inside the protection device 24; after the inner protection cover 242 is raised along with the top cover 25, the bottom of the inner protection cover 242 does not come out of the receiving groove because the height of the inner protection cover 242 is greater than the extended height of the hydraulic cylinder 23.

Specifically, the ventilation assembly 4 comprises a three-way pipe 41, a connecting pipe 44 and a fan 46, wherein two ends of the bottom of the three-way pipe 41 penetrate through the top cover 25, two ends of the bottom of the three-way pipe 41 are arranged outside the protection device 24, a bearing 42 is sleeved outside one end of the top of the three-way pipe 41, sliders 43 are fixedly mounted on the left side and the right side of the outer ring of the bearing 42, one end of the top of the three-way pipe 41 is arranged inside the connecting pipe 44, sliding grooves 45 are formed in the left side and the right side of the inner wall of the connecting pipe 44, the sliders 43 are connected inside the sliding grooves 45 in a sliding manner, the fan 46 is fixedly mounted inside the connecting pipe 44, and the bottom end of the connecting pipe 44 is communicated with an external gas collecting device through a pipeline; the suction force is generated by the rotation of the air fan 46 in the connecting pipe 44, the three-way pipe 41 leads out harmful gas generated by the electrolysis of the electrolytic cell 17, the bearing 42 enables the three-way pipe 41 to rotate along with the rotation of the top cover 25, and when the slide block 43 enables the top of the three-way pipe 41 to be lifted up, the top of the three-way pipe 41 can move in the connecting pipe 44.

Specifically, the top cover 25 is cylindrical, four observation windows are arranged on the outer side surface of the top cover 25, the bottom of the top cover 25 is through, a connecting groove 26 is formed in the bottom of the top cover 25, a closed ring 18 is formed in the top of the outer box 11, and the closed ring 18 is inserted into the connecting groove 26; when the top cover 25 is closed, a worker observes the progress of the internal plating through the observation window, and the sealing ring 18 is inserted into the connecting groove 26 to seal the joint between the top cover 25 and the outer box 11, so that gas does not flow out.

Specifically, through holes are formed in the lower surface of the fixing block 31 and one side surface of the fixing block 31 close to the protection device 24, the other end of the connecting rope 36 penetrates through the through holes, and the other end of the connecting rope 36 penetrates through the inner protection cover 242; the telescopic end of the hydraulic cylinder 23 is extended, and the through hole restricts the position of the connection rope 36, so that the connection rope 36 pulls the second connection rod 322 upward.

Specifically, a limiting plate 38 is fixedly mounted at the bottom of the top cover 25, the limiting plate 38 is hollow, one end of the limiting plate 38 is communicated with one side surface of the fixing block 31, the connecting rope 36 is arranged inside the limiting plate 38, a first pulley 311 is fixedly mounted on one side surface of the inner wall of the fixing block 31, a second pulley 39 is fixedly mounted at the bottom of the top cover 25, the second pulley 39 is arranged at the other end of the limiting plate 38, the connecting rope 36 is slidably connected to the surfaces of the first pulley 311 and the second pulley 39, and the connecting rope 36 is a steel wire rope; the stopper plate 38 restricts the moving direction and position of the connecting string 36, prevents the connecting string 36 from falling into the electrolytic bath 17, and the first pulley 311 and the second pulley 39 reduce the friction force when the connecting string 36 moves.

s1, derusting by fasteners: before the fastener is placed in the electrolytic cell 17, rust removing work is carried out in the external container, firstly, oil dirt and impurities on the surface of the fastener are cleaned by using a sodium stearate aqueous solvent, then, the surface of the fastener is subjected to rust removing by using a solvent with the mass ratio of hydrochloric acid to hexamethylenetetramine to sodium dodecyl benzene sulfonate to triethanolamine to sodium chloride to water of 10:3:5:1:1:20, and the fastener is cleaned by using clean water after rust removing.

S2, electroplating:

1. starting the hydraulic cylinder 23 to lift the top cover 25, enabling the connecting ropes 36 connected with the four connecting blocks 27 to respectively drive the second connecting rods 322 in the four connecting pieces 32 to rotate, enabling the hooks 37 to be lifted from the electrolytic cell 17 by the second connecting rods 322, enabling the cleaned fasteners to be hung on the hooks 37 by a worker, and then starting the hydraulic cylinder 23 to move the top cover 25 downwards to enable the hooks 37 to return to the interior of the electrolytic cell;

2. the electrolytic cells 17 are divided into four electrolytic cells, wherein the electrolytic materials of the two electrolytic cells 17 are trivalent black zinc and black zinc-nickel alloy respectively, the storage battery 14 is used for electrifying the first electrode plate 15 and the second electrode plate 16 in the corresponding electrolytic cells 17, the fastening piece is positioned at the second electrode plate 16, and electroplating is started;

3. the other two electrolytic cells 17 are spare cells, single metal or alloy is placed in the spare cells or clad layer electroplating is carried out, after the fasteners are electroplated in one spare cell, the hydraulic cylinder 23 lifts the top cover 25 to enable the fasteners to be separated from the electrolytic cells 17, the motor 21 rotates the rotary table 22 to enable the fasteners to rotate to the upper side of the other spare cell, the telescopic end of the hydraulic cylinder 23 descends again, and the fasteners enter the electrolytic cells 17 to carry out the other layer electroplating.

S3, detection: after the fastener passes through the coating of the electrolytic cell 17, the fastener is taken off from the hook 37 and is placed into a special salt spray detection device for a salt spray test, wherein the trivalent black zinc electroplating layer needs 96 hours of salt spray, and the black zinc-nickel alloy needs 500 hours of salt spray.

The working principle is as follows: when the device is used, firstly, the hydraulic cylinder 23 is started, the telescopic end of the hydraulic cylinder 23 moves upwards, the top cover 25 is jacked up by the hydraulic cylinder 23, one end of the connecting rope 36 positioned on the turntable 22 is fixed, the other end of the connecting rope lifts upwards along with the top cover 25 to pull the second connecting rod 322, the second connecting rod 322 drives the hook 37 to rotate upwards through the rotating shaft 33, so that the hook 37 is far away from the electrolytic cell 17, a worker hangs a fastener on the hook 37, so that the telescopic end of the hydraulic cylinder 23 descends to drive the top cover 25 to descend, the sealing ring 18 is inserted into the connecting groove 26 to seal the inner space, the storage battery 14 is started to work, the coating work inside the electrolytic cell 17 starts, the worker can check the coating work proceeding state through the observation window, after the coating is finished, the air fan 46 is started, the gas generated by electrolysis is sucked into the three-way pipe 41 through two ends at the bottom of the three-way pipe 41 and is guided into other collecting devices through the connecting pipe 44, the three-way pipe 41 can move up and down in the connecting pipe 44 through the sliding block 43 to adapt to the movement of the top cover 25, after the gas is exhausted, the hydraulic cylinder 23 is started again, the top cover 25 is enabled to ascend, the second connecting rod 322 drives the hook 37 to lift the fastener out of the electrolytic cell 17, a worker takes down the fastener after being plated and sends the fastener to the salt spray testing device, when multilayer film plating is needed, after the first-layer plating top cover 25 is lifted, the motor 21 is started, the motor 21 rotates the rotary table 22 and the top cover 25, the hook 37 is enabled to move to the position above another electrolytic cell 17 from the position above the original electrolytic cell 17, and secondary plating work is carried out after the top cover 25 is lowered.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A stainless steel fastener surface treatment device, includes main part subassembly (1), closing component (2) and coupling assembling (3), its characterized in that:

the main body component (1) comprises an outer box body (11) and an inner box body (12), the outer box body (11) and the inner box body (12) are both cylindrical, the inner box body (12) is fixedly arranged at the center of the bottom of the inner wall of the outer box body (11), a storage battery (14) is fixedly arranged in the inner box body (12), a mounting groove (121) is arranged at the top of the inner box body (12), the top of the inner box body (12) is provided with a sealing component (2), the side surface of the inner box body (12) is fixedly provided with a clapboard (13), the number of the partition plates (13) is four, the four partition plates (13) are distributed around the central annular array of the inner box body (12), one side surface of each partition plate (13) is fixedly connected with the inner wall of the outer box body (11), and the four partition plates (13) divide a gap between the outer box body (11) and the inner box body (12) into four electrolytic cells (17);

the outer surface of the inner box body (12) is fixedly provided with a first electrode plate (15), the inner wall of the outer box body (11) is fixedly provided with a second electrode plate (16), the number of the first electrode plate (15) and the number of the second electrode plate (16) are four, the four first electrode plates (15) correspond to the four second electrode plates (16) one by one, and the four first electrode plates and the four second electrode plates are respectively arranged in four electrolytic cells (17);

the sealing assembly (2) comprises a motor (21), a rotary table (22), a hydraulic cylinder (23) and a top cover (25), the motor (21) is fixedly installed inside the installation groove (121), an output shaft of the motor (21) is rotatably connected with the center of the bottom of the rotary table (22), the lower surface of the rotary table (22) is rotatably connected with the upper surface of the inner box body (12), the hydraulic cylinder (23) is fixedly installed at the center of the top of the rotary table (22), the telescopic end of the hydraulic cylinder (23) is fixedly connected with the center of the bottom of the top cover (25), a ventilation assembly (4) is arranged at the top of the top cover (25), connecting assemblies (3) are arranged on the lower surface of the top cover (25), four groups of the connecting assemblies (3) are arranged, and the positions of the four groups of the connecting assemblies (3) correspond to the positions of the four electrolytic cells (17);

the connecting assembly (3) comprises a fixed block (31) and a connecting piece (32), the top of the fixed block (31) is fixedly connected with the bottom of the top cover (25), the bottom of the fixed block (31) is provided with the connecting piece (32), the connecting piece (32) is divided into a first connecting rod (321) and a second connecting rod (322), the top end of the first connecting rod (321) is fixedly connected with the bottom of the fixed block (31), the bottom end of the first connecting rod (321) is rotatably connected with the top end of the second connecting rod (322) through a rotating shaft (33), a hook (37) is fixedly mounted at the bottom end of the second connecting rod (322), and an opening of the hook (37) faces towards the hydraulic cylinder (23);

a connecting ring (35) is fixedly mounted on one side face of the second connecting rod (322), the connecting ring (35) is fixedly connected with one end of a connecting rope (36), the connecting rope (36) is arranged on the lower surface of the top cover (25), the other end of the connecting rope (36) is fixedly connected with a connecting block (27), and the connecting block (27) is fixedly mounted on the upper surface of the rotary table (22).

2. The stainless steel fastener surface treatment device according to claim 1, characterized in that: the last fixed surface of carousel (22) installs protection device (24), protection device (24) include outer safety cover (241) and interior safety cover (242), outer safety cover (241) and interior safety cover (242) are cylindrically, the bottom of outer safety cover (241) is connected with the last fixed surface of carousel (22), the holding tank has been seted up at the top of outer safety cover (241), the bottom of interior safety cover (242) is pegged graft in the inside of holding tank, the top of interior safety cover (242) is connected with the lower fixed surface of top cap (25).

3. The stainless steel fastener surface treatment device according to claim 2, characterized in that: the height of the inner protection cover (242) is larger than the length of the telescopic end of the hydraulic cylinder (23), and the hydraulic cylinder (23) is arranged in the protection device (24).

4. The stainless steel fastener surface treatment device according to claim 1, characterized in that: ventilation assembly (4) include three-way pipe (41), connecting pipe (44) and air fan (46), top cap (25) all runs through at the both ends of three-way pipe (41) bottom, the both ends of three-way pipe (41) bottom set up in the outside of protection device (24), bearing (42) have been cup jointed to the outside of three-way pipe (41) top one end, the left and right sides face fixed mounting of bearing (42) outer lane has slider (43), the one end at three-way pipe (41) top sets up in the inside of connecting pipe (44), spout (45) have been seted up to the left and right sides face of connecting pipe (44) inner wall, slider (43) sliding connection is in the inside of spout (45), the inside fixed mounting of connecting pipe (44) has air fan (46), the bottom of connecting pipe (44) is linked together through pipeline and external gas collection device.

5. The stainless steel fastener surface treatment device according to claim 1, characterized in that: the top cover (25) is cylindrical, four observation windows are arranged on the outer side face of the top cover (25), the bottom of the top cover (25) is communicated, a connecting groove (26) is formed in the bottom of the side face of the top cover (25), a closed ring (18) is formed in the top of the outer box body (11), and the closed ring (18) is inserted into the connecting groove (26).

6. The stainless steel fastener surface treatment device according to claim 1, characterized in that: the lower surface of fixed block (31) and a side that fixed block (31) are close to protection device (24) have all seted up the through-hole, the other end of connecting rope (36) runs through the through-hole, just the other end of connecting rope (36) runs through interior safety cover (242).

7. The stainless steel fastener surface treatment device according to claim 6, wherein: the bottom fixed mounting of top cap (25) has limiting plate (38), the inside cavity of limiting plate (38), the one end of limiting plate (38) is linked together with a side of fixed block (31), connect rope (36) to set up in the inside of limiting plate (38), a side fixed mounting of fixed block (31) inner wall has first pulley (311), the bottom fixed mounting of top cap (25) has second pulley (39), second pulley (39) set up in the other end of limiting plate (38), connect rope (36) sliding connection in the surface of first pulley (311) and second pulley (39), it is wire rope to connect rope (36).

8. A surface treatment process for a stainless steel fastener, comprising the surface treatment apparatus for a stainless steel fastener according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:

s1, derusting by fasteners: before the fastener is placed in an electrolytic cell (17), rust removing work is carried out in an external container, firstly, oil dirt and impurities on the surface of the fastener are cleaned by using a sodium stearate aqueous solvent, then, the surface of the fastener is cleaned by using a solvent with the mass ratio of hydrochloric acid to hexamethylenetetramine to sodium dodecyl benzene sulfonate to triethanolamine to sodium chloride to water of 10:3:5:1:1:20, and the fastener is cleaned by using clean water after rust removing;

s2, electroplating:

1. starting a hydraulic cylinder (23), lifting a top cover (25), driving a second connecting rod (322) in a connecting piece (32) to rotate by a connecting rope (36) connected with a connecting block (27), lifting a hook (37) from an electrolytic cell (17) by the second connecting rod (322), hanging a cleaned fastener on the hook (37) by a worker, starting the hydraulic cylinder (23) to move the top cover (25) downwards, and returning the hook (37) to the interior of the electrolytic cell;

2. the electrolytic cells (17) are divided into four electrolytic cells, wherein the electrolytic materials of the two electrolytic cells (17) are trivalent black zinc and black zinc-nickel alloy respectively, the storage battery (14) is used for electrifying the first electrode plate (15) and the second electrode plate (16) in the corresponding electrolytic cells (17), the fastener is positioned at the second electrode plate (16), and electroplating is started;

3. the other two electrolytic cells (17) are standby cells, single metal or alloy is placed in the standby cells or clad layer electroplating is carried out, after the fasteners are electroplated in one standby cell, the hydraulic cylinder (23) lifts the top cover (25) to enable the fasteners to be separated from the electrolytic cells (17), the motor (21) rotates the rotary table (22) to enable the fasteners to rotate to the position above the other standby cell, the telescopic end of the hydraulic cylinder (23) descends again, and the fasteners enter the electrolytic cells (17) to carry out the other layer electroplating;

s3, detection: after the fastener passes through the coating of the electrolytic cell (17), the fastener is taken down from the hook (37) and is placed into a special salt spray detection device for a salt spray test, wherein the trivalent black zinc electroplating layer needs 96 hours of salt spray, and the black zinc-nickel alloy needs 500 hours of salt spray.