NL2029715B1

NL2029715B1 - Stainless steel hollow pin water treatment chain

Info

Publication number: NL2029715B1
Application number: NL2029715A
Authority: NL
Inventors: Zhang Kefei; Chen Yibing; Zhang Yi; Zhou Jian; Shao Jian
Original assignee: Anhui Huangshan Hengjiu Chain Trans Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2023-06-08

Abstract

UITTREKSEL The invention discloses a stainless steel hollow pin water treatment chain, including outer chain plates, inner chain plates, welded inner attachment plates, welded outer attachment plates, hollow pins, sleeves, and rollers. The outer chain plates and 5 inner chain. plates are made of high chromiunl molybdenum. super duplex stainless steel material ASTMUNSS32750, which are required to have a hardness of 25—3OHRC and a tensile strength of not less than 800 MPa. The hollow pins, the sleeves, and the rollers are made of precipitation hardening stainless steel ASTMA564UNSSl7400. 10 The present invention has the following beneficial effects: the perfect fit between. parts enhances wear resistance and fatigue strength of hinged parts of the chain; high manufacturing precision reduces impact load generated by a water treatment grid conveyor hoist during operation; under rated conveying capacity, 15 the average tensile strength of the chain reaches 165 kN, which prolongs the service life of the chain. (+ Fig. )

Description

P787/NLpd

STAINLESS STEEL HOLLOW PIN WATER TREATMENT CHAIN

TECHNICAL FIELD

The present invention relates to the technical field of chains, and particularly to a stainless steel hollow pin water treatment chain.

BACKGROUND ART

It is an indisputable fact that human beings are facing a wa- ter crisis. In recent years, as countries around the world attach importance to sewage treatment, the number of sewage treatment plants increases rapidly. At present, there are more than 3000 sewage treatment plants nationwide, and the discharge of industri- al wastewater up to standards increases by 40-50%. Sewage treat- ment is widely used in the fields of construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical treatment, catering, etc., and more and more comes into the daily life of ordinary people. Sewage treat- ment chains are used for sewage treatment in various complicated situations such as corrosion and mud in working environments.

Therefore, the chains cannot be lubricated during operation, and the maintenance of the chains cannot be carried out in the pres- ence of corrosive substances. This puts higher requirements for the chains. With the vigorous development of sewage treatment in- dustry, the demand for water treatment chains is increasing, and the requirements for sewage treatment are increasingly high in to- day's environmental protection that receives more and more atten- tion. Sewage chains are important transmission parts of sewage ma- chinery and equipment. Due to their wide use, high demand, and complex and changeable use conditions, chain products are showing a diversified development trend. It is no longer practical to rely entirely on imported high-performance water treatment chains.

Therefore, we must focus on our own development to meet the re- quirements of the water treatment industry. Sewage chains are im- portant transmission parts in sewage machinery and equipment. The stainless steel hollow pin water treatment chain is located in the initial stage of sewage treatment and is a grid chain. The grid chain is used as a conveyor for mortar and sludge in water, and sewage 1s to move in the grid chain. Therefore, in order to adapt to the harsh conditions of movement in the sewage, the grid chain must have the characteristics of high strength, wear resistance, corrosion resistance and high working reliability.

Foreign sewage treatment started early, and water treatment chain products have shown a diversified development trend. This has led to the diversification of materials used for manufacturing chains. The application of various materials has become a theme of the innovation and development of sewage treatment chains. Sleeves and pin parts of traditional sewage chains are mainly made of two kinds of stainless steel materials. One is martensitic stainless steel, such as 420, its hardness and strength can be improved by heat treatment, but its corrosion resistance is poor. The other is austenitic stainless steel, such as 304, its corrosion resistance is good, but its hardness or strength cannot be improved by heat treatment because it does not have the feature of polymorphism.

Chain plate materials of the sewage chains usually include 420 and 304 stainless steel materials, but they also have the characteris- tics of poor corrosion resistance and insufficient strength. In light of the shortcomings of the above-mentioned traditional sew- age chains, providing high-performance stainless steel sewage treatment chains will lead the development direction of sewage treatment chains.

Based on this, the present invention designs a stainless steel hollow pin water treatment chain to solve the above prob- lems.

SUMMARY

The objective of the present invention is to provide a stain- less steel hollow pin water treatment chain, to solve the problems of poor corrosion resistance and insufficient strength of the wa- ter treatment chain in the prior art proposed in the background art.

In order to achieve the above objective, the present inven-

tion provides the following technical solution: a stainless steel hollow pin water treatment chain includes outer chain plates, in- ner chain plates, welded inner attachment plates, welded outer at- tachment plates, hollow pins, sleeves, and rollers; the inner chain plates are arranged in pairs, and two ends thereof in the length direction are respectively sleeved with hollow pins; the outer chain plates are arranged in pairs, two ends thereof in the length direction are respectively sleeved on the ends of two adja- cent hollow pins passing through the inner chain plate, and the outer chain plates are limited by shaft retaining rings disposed on the hollow pins; the sleeves are sleeved on the hollow pins, and two end surfaces thereof are in sliding contact with surfaces of the inner chain plates; the sleeves are sleeved with the roll- ers, the welded outer attachment plates are connected to the outer chain plates on the same side, and the welded inner attachment plates are connected to the inner chain plates on the same side; the outer chain plates and the inner chain plates are made of a high chromium molybdenum super duplex stainless steel material

ASTMUNSS32750, the hardness and strength of which are required, that is, the material is required to have a hardness of 25 to 30

HRC and a tensile strength of not less than 800 MPa; and the hol- low pins, the sleeves, and the rollers are made of precipitation hardening stainless steel ASTMALE4UNSS17400.

Preferably, each of the outer chain plates and the inner chain plates is respectively provided with passage holes for mounting the welded outer attachment plates and the welded inner attachment plates, and the number of the passage holes is at least two.

Preferably, large gaps are designed between the rollers and the sleeves and between the sleeves and the hollow pins, and after the chain is assembled, the initial gaps cooperating with each other are controlled at 0.6 to 0.8 mm.

Preferably, the hollow pins, the sleeves, and the rollers un- dergo solid solution strengthening in accordance with TS3 solid solution state standards before finishing, and then undergo sur- face passivation treatment.

Preferably, the welded inner attachment plates and the welded outer attachment plates are respectively connected to the inner chain plates and the outer chain plates by welding, the spot weld- ing positions, spot welding sequence and seam welding sequence are specified during the welding, and a 6-axis independent articulated industrial robot is used for the welding; and after the welding, the seams and heat-affected zones are smeared with passivation paste for passivation treatment according to the passivation pro- cess.

Preferably, the inner chain plates and the outer chain plates are both leveled on a multi-axis hydraulic leveling machine before and after second punching, and the welded inner attachment plates and the welded outer attachment plates after being welded are lev- eled by maintaining pressure on a leveling die by using a hydrau- lic punching machine, to reach a flatness of 0.1 mm; after the en- tire chain is formed, in order to ensure the flatness after the installation of accessories, the welded inner attachment plates and the welded outer attachment plates are also detected for the flatness of the entire chain, to keep the flatness of the entire chain at 0.25 mm; since chains are used in pair, the lengths of two chains used in pair should be matched; the chain length error value of the matching left and right chains is not more than 1.52 mm per 3000 mm, and the chains are packed in pair to ensure syn- chronous operation of the left and right chains.

Preferably, the leveling die includes a leveling base, each of two horizontally opposite ends of the leveling base is provided with a protruding portion, a hydraulic cylinder is horizontally arranged on each of the two protruding portions, a leveling block is connected to the hydraulic cylinder in a driven manner, a heat- ing element is arranged on the leveling block, the top of the lev- eling base is provided with a lower roll shaft, a guide post is vertically and fixedly connected to each of the two protruding portions, the two guide posts are jointly sleeved with a floating seat that can slide up and down, the bottom of the floating seat is provided with an upper roll shaft, and the floating seat is driven by a lifting unit to move down.

Preferably, the lifting unit includes two electromagnets re- spectively fixedly connected to the two protruding portions, the guide post is sleeved with a magnetic ring that can slide up and down, the two magnetic rings are respectively fixedly connected to two ends of the floating seat in the length direction, the upper ends of the two guide posts are sleeved with limiting members, the 5 guide posts are also sleeved with reset springs, and two ends of the reset springs in the elasticity direction respectively elas- tically press against the magnetic rings and the electromagnets.

Compared with the prior art, the present invention has the following beneficial effects: compared with the same type of prod- ucts, the perfect fit between the parts enhances the wear re- sistance and fatigue strength of the hinged parts of the chain; meanwhile, the high manufacturing precision reduces the impact load generated by a water treatment grid conveyor hoist during op- eration; and under the rated conveying capacity, the average ten- sile strength of the high-performance stainless steel hollow pin water treatment chain reaches 165 kN, which prolongs the service life of the chain.

BRIEFT DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a stainless steel hollow pin water treatment chain according to the present inven- tion;

FIG. 2 is a schematic top view of the structure in FIG. 1;

FIG. 3 is a schematic assembly diagram of the water treatment chain in the present invention; and

FIG. 4 is a schematic diagram of a three-dimensional struc- ture of a leveling die in an embodiment of the present invention.

In the figures, the list of parts represented by numerals is as follows: 1 - shaft retaining ring, 2 - hollow pin, 3 - roller, 4 - outer chain plate, 5 - welded inner attachment plate, 6 - inner chain plate, 7 - welded outer attachment plate, 8 - sleeve, 100 - leveling base, 200 - electromagnet, 300 - hydraulic cylinder, 400 — reset spring, 500 - magnetic ring, 600 - limiting member, 700 - guide post, 800 - floating seat, 900 - upper roll shaft, 1000 - lower roll shaft, 1100 - leveling block, and 1200 - heating ele- ment.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring to FIGS. 1-4, the present invention provides a technical solution: a stainless steel hollow pin water treatment chain includes outer chain plates 4, inner chain plates 6, welded inner attachment plates 5, welded outer attachment plates 7, hol- low pins 2, sleeves 8, and rollers 3; the inner chain plates 6 are arranged in pairs, and two ends thereof in the length direction are respectively sleeved with hollow pins 2; the outer chain plates 4 are arranged in pairs, two ends thereof in the length di- rection are respectively sleeved on the ends of two adjacent hol- low pins 2 passing through the inner chain plate 6, and the outer chain plates 4 are limited by shaft retaining rings 1 disposed on the hollow pins 2; the sleeves 8 are sleeved on the hollow pins 2, and two end surfaces thereof are in sliding contact with surfaces of the inner chain plates 6; the sleeves 8 are sleeved with the rollers 3, the welded outer attachment plates 7 are connected to the outer chain plates 4 on the same side, and the welded inner attachment plates 5 are connected to the inner chain plates 6 on the same side; the outer chain plates 4 and the inner chain plates 6 are made of a high chromium molybdenum super duplex stainless steel material ASTMUNSS32750, the hardness and strength of which are required, that is, the material is required to have a hardness of 25 to 30 HRC and a tensile strength of not less than 800 MPa; and the hollow pins 2, the sleeves 8, and the rollers 3 are made of precipitation hardening stainless steel ASTMA564UNSS17400. The high-performance stainless steel hollow pin water treatment chain is applied to front-end treatment equipment in water treatment plants, and still has good corrosion resistance and high strength in heavily polluted sewage. Based on the working conditions and use requirements of different stages of the water treatment pro- cess, the chain parts achieve good results through the combined application of multiple materials. In order to ensure the uni- formity of installation directions of the outer chain plates 4 and the inner chain plates 6, on the premise of ensuring the strength of the outer chain plates 4 and the inner chain plates 6, while installation passage holes of the welded outer attachment plates 7 and the welded inner attachment plates 5 are maintained, a passage hole is added, which facilitates installation and reduces mold manufacturing costs.

Large gaps are designed between the rollers 3 and the sleeves 8 and between the sleeves 8 and the hollow pins 2, and after the chain is assembled, the initial gaps cooperating with each other are controlled at 0.6 to 0.8 mm to improve the flexibility of operation of the rollers and hinges.

The hollow pins 2, the sleeves 8, and the rollers 3 undergo solid solution strengthening in accordance with TS3 solid solution state stand- ards before finishing, and then undergo surface passivation treat- ment to ensure the hardness and corrosion resistance.

The welded inner attachment plates 5 and the welded outer attachment plates 7 are respectively connected to the inner chain plates 6 and the outer chain plates 4 by welding, the spot welding positions, spot welding sequence and seam welding sequence are specified during the welding, and a 6-axis independent articulated industrial robot is used for the welding to reduce manual welding defects.

After the welding, the seams and heat-affected zones are smeared with passivation paste for passivation treatment according to the pas- sivation process, so as to ensure the corrosion resistance of the seams.

The inner chain plates 6 and the outer chain plates 4 are both leveled on a multi-axis hydraulic leveling machine before and after second punching, and the welded inner attachment plates 5 and the welded outer attachment plates 7 after being welded are leveled by maintaining pressure on a leveling die by using a hy- draulic punching machine, to reach a flatness of 0.1 mm.

After the entire chain is formed, in order to ensure the flatness after the installation of accessories, the welded inner attachment plates 5 and the welded outer attachment plates 7 are also detected for the flatness of the entire chain, to keep the flatness of the entire chain at 0.25 mm.

Since chains are used in pair, the lengths of two chains used in pair should be matched.

The chain length error value of the matching left and right chains is not more than 1.52 mm per 3000 mm, and the chains are packed in pair to ensure syn- chronous operation of the left and right chains and reduce initial wear of the chains and accidental influence caused by unbalance loading.

Compared with the same type of products, the perfect fit between the parts enhances the wear resistance and fatigue strength of the hinged parts of the chain. Meanwhile, the high manufacturing precision reduces the impact load generated by a wa- ter treatment grid conveyor hoist during operation. Under the rat- ed conveying capacity, the average tensile strength of the high- performance stainless steel hollow pin water treatment chain reaches 165 kN, which prolongs the service life of the chain. The leveling die includes a leveling base 100, each of two horizon- tally opposite ends of the leveling base 100 is provided with a protruding portion, a hydraulic cylinder 300 is horizontally ar- ranged on each of the two protruding portions, a leveling block 1100 is connected to the hydraulic cylinder 300 in a driven man- ner, a heating element 1200 is arranged on the leveling block 1100, the top of the leveling base 100 is provided with a lower roll shaft 1000, a guide post 700 is vertically and fixedly con- nected to each of the two protruding portions, the two guide posts 700 are jointly sleeved with a floating seat 800 that can slide up and down, the bottom of the floating seat 800 is provided with an upper roll shaft 900, and the floating seat 800 is driven by a lifting unit to move down. The lifting unit includes two electro- magnets 200 respectively fixedly connected to the two protruding portions, the guide post 700 is sleeved with a magnetic ring 500 that can slide up and down, the two magnetic rings 500 are respec- tively fixedly connected to two ends of the floating seat 800 in the length direction, the upper ends of the two guide posts 700 are sleeved with limiting members 600, the guide posts 700 are al- so sleeved with reset springs 400, and two ends of the reset springs 400 in the elasticity direction respectively elastically press against the magnetic rings 500 and the electromagnets 200.

When the chain is leveled, the chain is first spread between the upper roll shaft 900 and the lower roll shaft 1000, then the power of the electromagnets 200 is turned on, and the electromagnets 200 are energized to generate magnetism, which drives the two magnetic rings 500 to move down and drives the floating seat 800 to move down, so that the upper roll shaft 900 and the lower roll shaft 1000 press against the chain together. Since the chain is pressed by the upper roll shaft 900 and the lower roll shaft 1000 togeth-

er, the chain can move and is in a limit state.

Then the two hy- draulic cylinders 300 are synchronously started, and the two hy- draulic cylinders 300 drive the two leveling blocks 1000 to move toward the chain, so that the two leveling blocks 1000 level the welded inner attachment plates 5 and the welded outer attachment plates 7 on the chain.

Meanwhile, the heating elements 1200 are activated, and the heating elements 1200 heat the welded inner at- tachment plates 5 and the welded attachment plates 7, thereby achieving heating leveling and improving the leveling effect.

Claims

CONCLUSIESCONCLUSIONS

1. Roestvaststalen waterbehandelingsketting met holle pennen, met het kenmerk, dat deze omvat buitenste kettingplaten (4), binnenste kettingplaten (6), gelaste binnenste bevestigingsplaten (5), ge- laste buitenste bevestigingsplaten (7), holle pennen (2), hulzen (8) en rollen (3), waarbij de binnenste kettingplaten (6) paarsge- wijs zijn aangebracht, en twee uiteinden daarvan in de lengterich- ting respectievelijk zijn omhuld met holle pennen (2); waarbij de buitenste kettingplaten (4) in paren zijn geplaatst, waarbij twee uiteinden ervan in de lengterichting respectievelijk zijn gehuld op de uiteinden van twee aangrenzende holle pennen (2) die door de binnenste kettingplaat (6) gaan, en waarbij de buitenste ketting- platen (4) worden begrensd door asborgringen (1) die zijn aange- bracht op de holle pennen (2); waarbij de hulzen (8) zijn gehuld op de holle pennen (2), en twee eindvlakken daarvan in glijdend contact zijn met oppervlakken van de binnenste kettingplaten (6); waarbij de hulzen (8) zijn omhuld met de rollen (3), de gelaste buitenste bevestigingsplaten (7) aan dezelfde kant zijn verbonden met de buitenste kettingplaten (4), en de gelaste binnenste beves- tigingsplaten (5) aan dezelfde kant zijn verbonden met de binnen- ste kettingplaten (6); waarbij de buitenste kettingplaten (4) en de binnenste kettingplaten (6) zijn gemaakt van een hoog chroom- molybdeen super duplex roestvrij staal materiaal ASTMUNSS32750, waarvan de hardheid en sterkte vereist zijn, dat wil zeggen dat het materiaal een hardheid moet hebben van 25 tot 30 HRC en een treksterkte van niet minder dan 800 MPa; en waarbij de holle pen- nen (2), de hulzen (8) en de rollen (3) zijn gemaakt van precipi- tatie hardend roestvaststaal ASTMA564UNSS17400.A stainless steel water treatment chain with hollow pins, characterized in that it comprises outer chain plates (4), inner chain plates (6), welded inner fixing plates (5), welded outer fixing plates (7), hollow pins (2), sleeves (8) and rollers (3), wherein the inner chain plates (6) are arranged in pairs, and two ends thereof in the longitudinal direction are respectively sheathed with hollow pins (2); wherein the outer chain plates (4) are arranged in pairs, with two ends thereof longitudinally sheathed respectively on the ends of two adjacent hollow pins (2) passing through the inner chain plate (6), and wherein the outer chain plates (4) are limited by shaft retaining rings (1) fitted to the hollow pins (2); wherein the sleeves (8) are shrouded on the hollow pins (2), and two end faces thereof are in sliding contact with surfaces of the inner chain plates (6); wherein the sleeves (8) are sheathed with the rollers (3), the welded outer mounting plates (7) on the same side are connected to the outer chain plates (4), and the welded inner mounting plates (5) are connected on the same side with the inner chain plates (6); wherein the outer chain plates (4) and the inner chain plates (6) are made of a high chromium molybdenum super duplex stainless steel material ASTMUNSS32750, the hardness and strength of which are required, that is, the material must have a hardness of 25 to 30 HRC and a tensile strength of not less than 800 MPa; and wherein the hollow pins (2), the sleeves (8) and the rollers (3) are made of precipitation hardening stainless steel ASTMA564UNSS17400.

2. Roestvaststalen waterbehandelingsketting met holle pennen vol- gens conclusie 1, met het kenmerk, dat elk van de buitenste ket- tingplaten (4) en de binnenste kettingplaten (6) respectievelijk is voorzien van doorvoergaten voor het monteren van de gelaste buitenste bevestigingsplaten (7) en de gelaste binnenste bevesti- gingsplaten (5), en het aantal doorvoergaten minimaal twee is.The stainless steel hollow pin water treatment chain according to claim 1, characterized in that each of the outer chain plates (4) and the inner chain plates (6) is respectively provided with through holes for mounting the welded outer attachment plates (7 ) and the welded inner fixing plates (5), and the number of through holes is at least two.

3. Roestvaststalen waterbehandelingsketting met holle pennen vol- gens conclusie 1, met het kenmerk, dat tussen de rollen (3) en de hulzen (8) en tussen de hulzen (8) en de holle pennen (2) grote openingen zijn gevormd, en nadat de ketting is gemonteerd, de aan- vankelijke openingen die met elkaar samenwerken, worden ingesteld op 0,6 tot 0,8 mm.Stainless steel water treatment chain with hollow pins according to claim 1, characterized in that large gaps are formed between the rollers (3) and the sleeves (8) and between the sleeves (8) and the hollow pins (2), and after the chain is mounted, the initial gaps that interact with each other are set to 0.6 to 0.8 mm.

4. Roestvaststalen waterbehandelingsketting met holle pennen vol- gens conclusie 1, met het kenmerk, dat de holle pennen (2), de hulzen (8) en de rollen (3) een vaste oplossingsversterking onder- gaan in overeenstemming met de TS3-normen voor vaste oplossings- toestanden voorafgaand aan afwerking, en vervolgens een oppervlak- tepassiveringsbehandeling ondergaan.A stainless steel water treatment chain with hollow pins according to claim 1, characterized in that the hollow pins (2), the sleeves (8) and the rollers (3) undergo solid solution reinforcement in accordance with TS3 standards for solid solution states before finishing, and then undergoing surface passivation treatment.