CN108164054B

CN108164054B - The processing method of dyeing waste water

Info

Publication number: CN108164054B
Application number: CN201711492214.5A
Authority: CN
Inventors: 骆秀芳
Original assignee: Zhejiang Jinlaili Printing And Dyeing Co Ltd
Current assignee: Zhejiang Jinlaili Printing and Dyeing Co., Ltd.
Priority date: 2017-12-30
Filing date: 2017-12-30
Publication date: 2019-04-12
Anticipated expiration: 2037-12-30
Also published as: CN108164054A

Abstract

The invention discloses a kind of processing methods of dyeing waste water, the following steps are included: the grid prefiltration for being a) 5-8mm by grid gap by source water, then the source water after prefiltration is filtered through the grid essence that grid gap is 1-2mm, then passing to adding acid reagent in the first conditioning tank into the first conditioning tank to adjust PH is 6-8；Obtain water body A.Prefiltration of the present invention and essence filtering, can remove solid impurity in water body；The PH of waste water is adjusted in the environment of coagulant reaction by dyeing waste water in alkalinity, acid reagent；And impurity in the adsorbable water body of coagulant；It is passed through air to water body, removes particle in water body.

Description

The processing method of dyeing waste water

Technical field

The invention belongs to technical field of waste water processing, more particularly, to a kind of processing method of dyeing waste water.

Background technique

Dyeing waste water is the waste water of printing and dyeing mill's discharge based on processing cotton, fiber crops, chemical fibre and its blending product；Printing and dyeing are useless Water water is larger, 1 ton of every dyeing and printing process, 100~200 tons of textile water consumption, wherein 80~90% become waste water；Textile printing and dyeing wastewater Have the characteristics that water is big, organic pollutant content is high, alkalinity is big, change of water quality is big, belongs to one of intractable industrial wastewater, give up Contain dyestuff, slurry, auxiliary agent, finish, soda acid, fiber impurity, sand substance, inorganic salts etc. in water.

Existing water treatment technology especially handles effect to the organic matter in dyeing waste water to the poor processing effect of dyeing waste water Rate is low, can not handle the intracorporal organic matter of water completely, therefore, it is difficult to which the COD in dyeing waste water is down to discharge standard, and needs A variety of chemical assistant's agent are added, processing cost is high.

Summary of the invention

The present invention for overcome the deficiencies in the prior art, provides a kind of processing method of dyeing waste water that processing cost is low.

To achieve the goals above, the invention adopts the following technical scheme: a kind of processing method of dyeing waste water, including with Lower step:

A) source water prefiltration, essence are filtered, acid reagent is then added and adjusts PH, obtains water body A；

B) coagulant A and coagulant B is added in Xiang Shuiti A, after stirring, is passed through air；

C) ozone is passed through in Xiang Shuiti A；

D) weight ratio of interior addition active carbon in Xiang Shuiti A, the active carbon and source water is 1:150-220, obtains water body B；

E) water body B is placed in the electrolytic cell Inner electrolysis that anode is composite interlayer ti-supported lead dioxide electric material, obtains water Body C；

F) water body C is passed through to precipitation process in sedimentation basin.

The present invention can be removed most of in water body by carrying out prefiltration and essence filtering twice filtering technique to dyeing waste water Solid impurity, prefiltration can avoid water body in partial impurities block mesh in smart filter process, will not influence water body stream Grid through prefiltration；The PH of waste water can be adjusted to neutrality by dyeing waste water in alkalinity, therefore by adding acid reagent Range adds coagulant into water body convenient for subsequent, and coagulant is enable to react under suitable environment with water body, and mixes The setting of solidifying agent can carry out Adsorption to the impurity precipitated that be difficult on a small quantity in water body, be passed through air into water body, it can be achieved that Air bearing is realized to water body, removes the intracorporal particle of water；Electrolytic cell is set, and being passed through in electrolytic cell ozone can be in water body, it can So that the organic matter in water body in anodic oxidation, makes the organic matter in water body be converted to water and carbon dioxide, in treatment process Without adding chemical agent, secondary pollution will not be generated, high treating effect and high-efficient；Increasing ozone simultaneously can accelerate in water body Oxidation operation, enhance in water body organic matter handle efficiency；Water body COD is reduced, reaching water body can discharge value；Titanium-based The more other electrodes of composite interlayer brown lead oxide oxygen evolution potential with higher, can effectively prevent the side reaction in electrolytic process Occur, electrolytic efficiency is high, and oxidation efficiency is high, and small, long service life is lost in electrolytic process.

Further, in the step c), the rate that ozone is passed through is 30-50 mol/L/min；The rate is passed through smelly Oxygen can remove the partial organic substances premature oxidation in water body, while can also removing unit bacterium.

Further, the coagulant A includes 10-15 parts of Sodium Polyacrylates, 8-11 parts of polyacrylamides, 2-4 parts of polyphenyl Vinyl sulfonate and 15-30 polyethylene glycol oxide；Sodium Polyacrylate, polyacrylamide, poly styrene sulfonate and polyethylene glycol oxide It can be in flocculence in water body, consequently facilitating the particle in water can adhere to, and coagulant A is organic coagulants, in dyeing waste water In there are in the case where large amount of organic, on water body, there is no influences, and in subsequent organic matter treatment process, can to this with Original organic matter is jointly processed by water body, and the influence to water body is small.

Further, the coagulant B includes following components by weight: 15-25 parts of starch and 7-9 parts of celluloses；It should Natural products can also convert under electrolysis conditions, while starch and cellulose are natural products, therefore can be with discharge into water value In environment, self detergent power of environment quickly can convert inorganic matter for the natural products.

Further, the acid reagent includes following components by weight: 7-8 parts of hydrochloric acid and 9-13 parts of hypochlorous acid；Salt It is acid strong, the PH of water body can be quickly adjusted to certain value, and hypochlorous acid is weak acid, therefore can be after hydrochloric acid is adjusted, to water Body PH is precisely adjusted, and hypochlorous acid have it is Bleachability, being capable of pigment in purifying water body.

Further, it in the step e), in electrolysis, while being passed through into water body B with 5-12 mol/L/min rate Ozone；Ozone has strong oxidizing property, can aoxidize to the intracorporal partial organic substances of water, enhance the effect of anode electrolysis, removes Organic matter in water body, and ozone can also kill the bacterium in water body, must germ in full water body with processing complete it is clear Water enters in environment.

Further, load has ruthenium iridium on the active carbon, and the ruthenium iridium load capacity is the 0.5%-5% of activated carbon weight； Load ruthenium iridium can effectively enhance the adsorption capacity of active carbon on the activated carbon, and then remove the pigment in water body.

Further, the electrolytic cell includes pond body, cathode part, anode member and connecting component；The cathode part with it is described Anode member is spaced apart from each other setting；The connecting component includes connection ontology, first connecting portion and second connecting portion；Described first connects What socket part and anode member were connected, the second connecting portion is detachably connected by a fixation member and cathode part；Cathode part and sun Pole part is spaced apart from each other setting, can accelerate the speed of water body electrolysis, improves electrolytic efficiency, reduces the overall volume of electrolytic cell, reduces Occupied area；First connecting portion and anode member are connected, and stability is high, and anode member will not be broken, and cathode circuit directly passes through first Interconnecting piece is connected with anode member, and electrical efficiency performance is good, and anodic oxidation ability is strong；And cathode is using stainless steel, iron plate, graphite etc. Ordinary electrode, low cost reduce the cost of electrolytic cell, be detachably connected by fixation member, can be convenient for being lost Cathode part is replaced, convenient disassembly, will not damage connecting component.

Further, the fixation member including the first fixinig plate, the second fixinig plate and is equipped with the first fixinig plate and second Elastic component between fixinig plate；First fixinig plate is equipped with the first arc protrusion, and second fixinig plate is equipped with the second arc Shape protrusion and the third arc protrusion below second arc protrusion；Horizontal plane position locating for first arc protrusion Between the second arc protrusion and third arc protrusion；First fixinig plate and the mutual cooperation of the second fixinig plate can be by cathode parts Firmly, the first arc protrusion, the second arc protrusion and third arc protrusion are set, it can be convenient for cathode part directly from lower end along arc The arcwall face of shape protrusion slides into, and the connection type is simple, and when installation, which removes from, specially beats the first fixinig plate and the second fixinig plate The step of opening, and the forced area between three arc protrusions and cathode part is small, therefore its mutual active force is big, makes first to consolidate Stator and the second fixinig plate more step up to what cathode part pressed from both sides, three curved portions are set on three different horizontal planes, the first arc Shape protrusion resists the centre on cathode part top, and second and third arc protrusion be against the upper and lower of the first arc protrusion, thus There are three different mutual stress points in arc protrusion tool for cathode part, play three identical function and effect, convex compared to by arc Portion is located in same level, only one stress point, can be dropped fixed effect in the case where not changing manufacturing cost substantially and be mentioned It is three times higher.

Further, the cathode part is equipped with the first groove, convex with the second arc matched with the first arc protrusion The second groove that portion matches and the third groove matched with third arc protrusion；First arc protrusion is equipped with multiple Retaining lugs, first groove are equipped with multiple fixation cavitys matched with the retaining lugs；It is arranged on cathode part The groove of cooperation is thought in arc protrusion, is increased the forced area of arc protrusion Yu cathode part, is not easy to fall, and can also be convenient for Whether in place installation is judged when installation, and reduce the overall volume of fixation member during operation, retaining lugs is set and consolidate Determining cavity can be when connection, and retaining lugs penetrates intracavitary to anchor, can keep the fixed effect to cathode part, it is ensured that yin Slide downward and shaking will not occur for pole part, so that cathode part can steady operation；The setting of retaining lugs and fixed cavity is into one Step increases the contact area between the first arc protrusion and the first groove, to increase power of rubbing.

Upper described, prefiltration of the present invention and essence filtering can remove solid impurity in water body；Dyeing waste water is acid in alkalinity The PH of waste water is adjusted in the environment of coagulant reaction by reagent；And impurity in the adsorbable water body of coagulant；Sky is passed through to water body Gas removes particle in water body；Setting electrolytic cell makes organic matter in water body be not necessarily to additionization in anodic oxidation Cheng Shui and carbon dioxide Medicament is learned, will not generate secondary pollution, high treating effect and high-efficient；Oxidation operation in water body can be accelerated by increasing ozone, be dropped Low water body COD, reaching water body can discharge value.

Detailed description of the invention

Fig. 1 is the structural diagram of the present invention.

Fig. 2 is the enlarged drawing of A in Fig. 1.

Fig. 3 is the enlarged drawing of B in Fig. 2.

Fig. 4 is the enlarged drawing of C in Fig. 2.

Specific embodiment

In order to make those skilled in the art better understand the present invention program, below in conjunction in the embodiment of the present invention Attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.

Embodiment one:

A kind of processing method of dyeing waste water, comprising the following steps:

Industrial wastewater is subjected to prefiltration processing by the grid that grid gap is 8mm, filters out stone, the sand in the water of source Then the solid matters such as stone are filtered through the grid essence that grid gap is 2mm；Source water is passed through to the first conditioning tank, then to Add acid reagent in the second conditioning tank, it is 8 parts of hydrochloric acid and 13 parts of hypochlorous acid which, which presses, will using acid reagent It is 8 that water body A, which is adjusted to PH, obtains water body A.

Further, the water body A in the first conditioning tank among the above is pumped into the second conditioning tank, and is added into conditioning tank The coagulant being made of 15 parts of Sodium Polyacrylates, 11 parts of polyacrylamides, 4 parts of poly styrene sulfonates and 30 polyethylene glycol oxides A adds the coagulant B mixed by 25 parts of starch and 9 parts of celluloses after coagulant A is completely dissolved after 8-15min, After coagulant B is completely dissolved, water body is stirred using agitating device, stirs duration 35min；After the adjustment is completed by One adjusting bottom of pond portion is passed through air 80min；After being passed through air and completing, it is passed through ozone in Xiang Shuiti A, water body A is exposed Gas, the rate that ozone is passed through are 50 mol/L/min, the when a length of 53min being passed through.

Specifically, adding active carbon into water body, the amount of the active carbon is the mixing of the water phase of 1g active carbon and 220g, wherein Load has ruthenium iridium on the active carbon, and the load capacity of ruthenium iridium is the 5% of activated carbon weight；And after active carbon addition, stir Water body is mixed, is then allowed to stand；After standing 21-26min, the active carbon of addition is filtered out, water body B is obtained.

Further, water body B is passed through with the rate of 17L/min to being electrolysed in electrolytic cell, wherein the electrolytic cell Anode is composite interlayer ti-supported lead dioxide electric material, while being also passed through in the bottom of electrolytic cell with 9 mol/L/min rate Ozone, it is water body C that water body, which by four electrolysis, need to be electrolysed the water body of completion, in electrolytic process；Water body C is passed through to sedimentation basin It is interior, it is precipitated, the water body on sedimentation basin top is conveyed by transfer pipeline then, re-uses and is produced with work, and will precipitating The dirt of bottom of pond portion transports (number of substance is parts by weight among the above) with vehicle.

Embodiment two

Industrial wastewater is subjected to prefiltration processing by the grid that grid gap is 5mm, filters out stone, the sand in the water of source Then the solid matters such as stone are filtered through the grid essence that grid gap is 1mm；Source water is passed through to the first conditioning tank, then to Add acid reagent in the second conditioning tank, which is 7 parts of hydrochloric acid and 9 parts of hypochlorous acid, using acid reagent by water It is 6 that body A, which is adjusted to PH, obtains water body A.

Further, the water body A in the first conditioning tank among the above is pumped into the second conditioning tank, and is added into conditioning tank The coagulant A being made of 10 parts of Sodium Polyacrylates, 8 parts of polyacrylamides, 2 parts of poly styrene sulfonates and 15 polyethylene glycol oxides, After coagulant A is completely dissolved, the coagulant B mixed by 15 parts of starch and 7 parts of celluloses is added after 8min, in coagulation After agent B is completely dissolved, water body is stirred using agitating device, stirs duration 30min；After the adjustment is completed by first is adjusted Bottom of pond portion is passed through air 60min；After being passed through air and completing, it is passed through ozone in Xiang Shuiti A, water body A is aerated, ozone The rate being passed through is 30 mol/L/min, the when a length of 45min being passed through.

Specifically, adding active carbon into water body, the amount of the active carbon is the mixing of the water phase of 1g active carbon and 150g, wherein Load has ruthenium iridium on the active carbon, and the load capacity of ruthenium iridium is the 0.5% of activated carbon weight；And after active carbon addition, Water body is stirred, is then allowed to stand；After standing 21min, the active carbon of addition is filtered out, water body B is obtained.

Further, water body B is passed through with the rate of 12L/min to being electrolysed in electrolytic cell, wherein the electrolytic cell Anode is composite interlayer ti-supported lead dioxide electric material, while being also passed through in the bottom of electrolytic cell with 8 mol/L/min rate Ozone, it is water body C that water body, which by four electrolysis, need to be electrolysed the water body of completion, in electrolytic process；Water body C is passed through to sedimentation basin It is interior, it is precipitated, the water body on sedimentation basin top is conveyed by transfer pipeline then, re-uses and is produced with work, and will precipitating The dirt of bottom of pond portion transports (number of substance is parts by weight among the above) with vehicle.

Embodiment three

Industrial wastewater is subjected to prefiltration processing by the grid that grid gap is 6.4mm, filter out stone in the water of source, Then the solid matters such as sandstone are filtered through the grid essence that grid gap is 2mm；Source water is passed through to the first conditioning tank, then Acid reagent is added in towards the second conditioning tank, which is 7.1 parts of hydrochloric acid and 11 parts of hypochlorous acid, uses acid reagent It is 7.1 that water body A, which is adjusted to PH, obtains water body A.

Further, the water body A in the first conditioning tank among the above is pumped into the second conditioning tank, and is added into conditioning tank The coagulation being made of 12 parts of Sodium Polyacrylates, 9.5 parts of polyacrylamides, 3.1 parts of poly styrene sulfonates and 17 polyethylene glycol oxides Agent A adds the coagulant mixed by 18 parts of starch and 8.3 parts of celluloses after coagulant A is completely dissolved after 12min B stirs water body using agitating device, stirs duration 32min after coagulant B is completely dissolved；After the adjustment is completed by, First adjusting bottom of pond portion is passed through air 71min；After being passed through air and completing, it is passed through ozone in Xiang Shuiti A, water body A is carried out Aeration, the rate that ozone is passed through are 41 mol/L/min, the when a length of 47min being passed through.

Specifically, adding active carbon into water body, the amount of the active carbon is the mixing of the water phase of 1g active carbon and 200g, wherein Load has ruthenium iridium on the active carbon, and the load capacity of ruthenium iridium is the 3.1% of activated carbon weight；And after active carbon addition, Water body is stirred, is then allowed to stand；After standing 24min, the active carbon of addition is filtered out, water body B is obtained.

Further, water body B is passed through with the rate of 15L/min to being electrolysed in electrolytic cell, wherein the electrolytic cell Anode is composite interlayer ti-supported lead dioxide electric material, while also logical with 8.5 mol/L/min rate in the bottom of electrolytic cell Enter ozone, it is water body C that water body, which by four electrolysis, need to be electrolysed the water body of completion, in electrolytic process；Water body C is passed through to sedimentation basin It is interior, it is precipitated, the water body on sedimentation basin top is conveyed by transfer pipeline then, re-uses and is produced with work, and will precipitating The dirt of bottom of pond portion transports (number of substance is parts by weight among the above) with vehicle.

As shown in Figs 1-4, the electrolytic cell includes pond body 1, cathode part 2, anode member 3 and connecting component 4, wherein institute The pond body 1 stated is that inner wall is equipped with ceramic layer fountain square, is set in the pond body 1 there are four by the cathode part 2, anode member 3 And the electrolysis means that power supply 6 is constituted, the cathode part 1 are steel plate, the anode member 3 is composite interlayer titanium-based titanium dioxide Ni―Ti anode net made of lead material, the anode member 3 and the cathode part 2 are spaced apart from each other and are set together, i.e. anode member 3 and yin Pole part 2 is adjacent together, is then realized and is fixed by connecting component 4；Wherein the connecting component 4 includes to connect ontology 41, first connecting portion 42 and second connecting portion 43, the first connecting portion 42 and second connecting portion 43 are respectively perpendicular to connect 41 bottom of ontology；And first connecting portion 42 is and the integrally formed titanium item of the connection ontology 41, second connection Portion 43 is the titanium item of inner hollow；The first connecting portion 42 and the anode member 3 are connected, which is warp By being welded and fixed together, the second connecting portion 43 is detachably connected with the cathode part 2.

Specifically, being equipped with a placed cavity 411 in the connection ontology 41, first is equipped in the placed cavity 411 absolutely Edge body 413, the first insulator 413 are pipeline made of ceramics；Simultaneously be additionally provided on the connection ontology 411 it is multiple and The quantity of the lock chamber 412 that placed cavity 413 is connected, the lock chamber 412 is consistent with the quantity of cathode part 2, and the lock chamber 412 It is connected with the chamber in second connecting portion 43, second insulator 414 is equipped on the lock chamber 412 and second connecting portion 43, The second insulator 414 is made of ceramic material, and is connected in second connecting portion 43；In the first insulator 413 Equipped with electric conductor 44, which is electric wire, and the copper being connected with the electric conductor 44 is equipped in the second insulator 414 Item and the copper sheet being connected with the copper bar, the copper sheet are installed on the inner wall of second insulator 414；First insulator and Two insulators, the cathode traces that can effectively avoid power supply pass on connection ontology, cause power supply short circuit, lead to power-fail.

Further, a fixation member 5 is equipped on the lower end of the second connecting portion 43, which includes First fixinig plate 51, the second fixinig plate 52 and elastic component 53, wherein dividing on first fixinig plate 51 and the second fixinig plate 52 Not She You inner wall there is the ceramic insulating layer of copper sheet, and first fixinig plate 51 and the second fixinig plate 52 pass through 53 phase of elastic component Even, and elastic component 53 is in non-retracted position；The the first arc protrusion to bend inwards is equipped on first fixinig plate 51 511, the second arc protrusion 522 and third arc protrusion 523 to bend inwards is equipped on second fixinig plate 52, wherein the Two arc protrusions 522 are located at the top of third arc protrusion 523, and horizontal plane locating for the first arc protrusion 511 is located at second Between horizontal plane locating for arc protrusion 522 and third arc protrusion 523.

Further, the first groove 211, the second groove 222 and third groove 223, tool are equipped on the cathode part 2 Body, first groove 211 is matched with first arc protrusion 511, and the second groove 222 and second arc are convex Portion 522 matches, and third groove 223 is matched with third arc protrusion 523, and described herein matching is combined into, in cathode part 2 When being caught between the first fixinig plate 51 and the second fixinig plate 52, arc protrusion can be caught in corresponding groove；Described First arc protrusion 511 is equipped with multiple retaining lugs 514, and first groove 511 is equipped with multiple convex with the fixation The fixation cavity 214 that portion 514 matches, specifically, being caught in the cathode part 2 to the first fixinig plate 51 and the second fixinig plate 52 Between when, the retaining lugs 514 can be first caught in fixed cavity 214, then the second arc protrusion 522 and the Three arc protrusions 523 can be caught in corresponding groove.

In order to enable cathode part 2 and 3 lower end of anode member are stablized, it is installed with a clamping component 7 in 1 bottom of pond body, The clamping component 7 includes the first clamping element 71 and the second clamping element 72, and first clamping element 71 and the second clamping element 72 divide Not Wei a C font titanium；The clamping component 7 can be such that cathode part 2 and 3 lower end of anode member fixes, and keep lower end in water flow It will not shake under impact, further keep monolithic stability；And clamping component 7 also can avoid cathode part 2 and move downward, and protect Hold monolithic stability；It is also equipped with ozone pipeline 8 in the bottom of the pond body 1, which can be convenient for ozone in electrolytic process Organic matter is aoxidized；The ozone generating-device 9 being connected with the ozone pipeline 8 is equipped with outside the pond body 1.

Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment should fall within the scope of the present invention.

Claims

1. a kind of processing method of dyeing waste water, comprising the following steps:

A) source water prefiltration, essence are filtered, acid reagent is then added and adjusts PH, obtains water body A；The acid reagent is by weight Part includes following components: 7-8 parts of hydrochloric acid and 9-13 parts of hypochlorous acid；

C) ozone is passed through in Xiang Shuiti A；

D) weight ratio of interior addition active carbon in Xiang Shuiti A, the active carbon and source water is 1:150-220, obtains water body B；It is described Load has ruthenium iridium on active carbon, and the ruthenium iridium load capacity is the 0.5%-5% of activated carbon weight；

F) water body C is passed through to precipitation process in sedimentation basin；

The electrolytic cell includes pond body (1), cathode part (2), anode member (3) and connecting component (4)；The cathode part (2) and institute It states anode member (3) and is spaced apart from each other setting；The connecting component (4) includes connection ontology (41), first connecting portion (42) and second Interconnecting piece (43)；The first connecting portion (42) and anode member (3) are connected, and the second connecting portion (43) passes through a fixation member (5) it is detachably connected with cathode part (2)；The fixation member (5) includes the first fixinig plate (51), the second fixinig plate (52) and sets There is the elastic component (53) between the first fixinig plate (51) and the second fixinig plate (52)；First fixinig plate (51) is equipped with the first arc Shape protrusion (511), second fixinig plate (52) are equipped with the second arc protrusion (522) and are located at second arc protrusion (522) the third arc protrusion (523) below；It is convex that horizontal plane locating for first arc protrusion (511) is located at the second arc Between portion (522) and third arc protrusion (523).

2. a kind of processing method of dyeing waste water according to claim 1, it is characterised in that: in the step c), ozone The rate being passed through is 30-50 mol/L/min.

3. a kind of processing method of dyeing waste water according to claim 1, it is characterised in that: the coagulant A is by weight Part includes following components: 10-15 parts of Sodium Polyacrylates, 8-11 parts of polyacrylamides, 2-4 parts of poly styrene sulfonates and 15-30 Polyethylene glycol oxide.

4. a kind of processing method of dyeing waste water according to claim 1, it is characterised in that: the coagulant B is by weight Part includes following components: 15-25 parts of starch and 7-9 parts of celluloses.

5. a kind of processing method of dyeing waste water according to claim 1, it is characterised in that: in the step e), in electricity Xie Shi, while ozone is passed through with 5-12 mol/L/min rate into water body B.

6. a kind of processing method of dyeing waste water according to claim 1, it is characterised in that: set on the cathode part (2) Have the first groove (211) matched with the first arc protrusion (511), matched with the second arc protrusion (522) it is second recessed Slot (222) and the third groove (223) matched with third arc protrusion (523)；First arc protrusion (511) is equipped with Multiple retaining lugs (514), first groove (211) are equipped with multiple fixations matched with the retaining lugs (514) Cavity (214).