CN114454401A - Online casting molding die and molding process for composite scraper - Google Patents
Online casting molding die and molding process for composite scraper Download PDFInfo
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- CN114454401A CN114454401A CN202110956392.9A CN202110956392A CN114454401A CN 114454401 A CN114454401 A CN 114454401A CN 202110956392 A CN202110956392 A CN 202110956392A CN 114454401 A CN114454401 A CN 114454401A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/123—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels for centering the inserts
- B29C33/126—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels for centering the inserts using centering means forming part of the insert
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
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- B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention provides a composite scraper blade online casting forming die and a forming process, which comprises a lower die and an upper die, wherein the lower die comprises a main groove and end grooves communicated with the left end and the right end of the main groove, the upper die comprises a main cavity and end cavities positioned at the left end and the right end of the main cavity, a vertical joint part is arranged in the main cavity along the position close to the end cavities, groove protecting frames protruding downwards are distributed on the front side and the rear side of the main cavity, the main groove comprises a first step groove matched with the groove protecting frames, and after the upper die and the lower die are connected in a locking manner, the groove protecting frames are buckled in the first step groove to form a forming cavity. Through the online casting molding die and the molding process for the composite scraper blade, the composite scraper blade can efficiently meet the development requirement of light weight of coal equipment after casting molding, and can simultaneously ensure the use effect of the composite scraper blade after long-time use, so that the service life of the composite scraper blade is prolonged.
Description
Technical Field
The invention relates to the technical field of composite scraper blade machining and forming, in particular to an online casting forming die and a forming process for a composite scraper blade.
Background
The scraper conveying equipment is a continuous conveying machine which fixes scrapers on chains to serve as traction members and conveys materials in a middle groove, has the advantages of large conveying capacity, wide adaptive environment, simplicity in maintenance and the like, and is widely applied to coal mine fully-mechanized coal mining working faces. In the scraper conveying equipment, a scraper chain is composed of a scraper, a pressing plate, a bolt, a nut and a chain, and the scraper chain is a direct execution part for driving a conveyed material to move.
At present, in coal machine transportation equipment, the scraper blade is the whole forging structure of low alloy steel, and its manufacturing process is: the forging forming → the machining → the heat treatment, the material is generally 40Mn2 or 27SiMn, thereby leading to the heavy weight of the coal machine transportation equipment, the great part of the energy consumption of the motor load is consumed by the coal machine transportation equipment, and the transportation capability of the coal machine transportation equipment and the production efficiency of the whole set of coal mining equipment are limited; meanwhile, the steel scraper component has large abrasion to the bottom of the coal machine transportation equipment, so that complete equipment is seriously damaged, the service life is short, and the production efficiency is low.
As an improvement, a large number of researchers in the coal machine transportation equipment industry are also researching to improve the metal scraper into a composite mode of a non-metal material and a metal core plate, the production process is changed from original forging machining into the mode of placing the forged metal core plate in a mold to directly pour the non-metal material for molding, so that the loading load of the scraper conveying equipment for the coal mine is reduced, the development requirement of light weight of the coal machine equipment is really met to a great extent, and the use effect is not ideal. For example, the composite scraper has a low structural strength, and needs to be operated in a severe installation environment and under a complex extreme load condition, after a period of use, the tensile strength, wear resistance, flame resistance, antistatic property and the like of the composite scraper are further greatly reduced, and the composite scraper is often accompanied with unsmooth conveying operation, serious local wear and even breakage of a chain in serious conditions, so that the service life is seriously shortened.
Disclosure of Invention
In view of the above, the technical problems to be solved by the present invention are: the first aspect is to provide an online casting mold for a composite scraper, so that after casting, the composite scraper can efficiently meet the development requirement of light weight of coal equipment, and can simultaneously ensure the use effect of the composite scraper after long-time use, thereby prolonging the service life of the composite scraper.
In order to solve the technical problem of the first aspect, the invention provides an online casting forming mold for a composite scraper, which comprises a lower mold and an upper mold, wherein the lower mold comprises a main groove and end grooves communicated with the left end and the right end of the main groove, the upper mold comprises a main cavity and end cavities positioned at the left end and the right end of the main cavity, a vertical joint part is arranged in the main cavity along the position close to the end cavities, groove protection frames protruding downwards are distributed on the front side and the rear side of the main cavity, the main groove comprises a first step groove matched with the groove protection frame, and after the upper mold is connected with the lower mold in a locking manner, the groove protection frame is locked in the first step groove to form a forming cavity.
Preferably, the main groove further comprises a second stepped groove closely attached to the inner side of the first stepped groove, and the second stepped groove is communicated with the end groove.
Preferably, a plurality of positioning plugs are fixedly arranged in the second stepped groove.
Preferably, a plurality of top piece holes are formed in the main cavity in an upward penetrating mode, and the projections of the top piece holes and the positioning plug on the horizontal plane are not overlapped with each other.
Preferably, the main cavity is provided with a pressing plate seat, a flat chain seat and a vertical chain seat which are arranged in a downward protruding mode, a first avoidance space is formed between the pressing plate seat and the groove protecting frame, and a second avoidance space is formed between the flat chain seat and the vertical chain seat in a surrounding mode.
Preferably, the main chamber further comprises at least one of the following:
1) the top piece hole penetrates through the pressing plate seat;
2) the pressure plate seat comprises an extension section which penetrates through the vertical joint part along the length direction and extends to the end cavity, the first avoidance space penetrates through the vertical joint part and comprises a third avoidance space formed between the extension section and the slot protecting frame, and the third avoidance space is communicated with the end cavity;
3) the flat chain seat and the vertical chain seat are arranged close to the inner side wall of the groove protecting frame, and the downward protruding height of the vertical chain seat is higher than that of the groove protecting frame and forms a reinforced groove frame of the groove protecting frame.
Preferably, the casting mold further includes a sealing strip, and a sealing groove adapted to the sealing strip is formed in one or more of the lower mold corresponding to the outer peripheral side of the groove guard frame, the lower end of the vertical joint portion, and the second stepped groove.
Preferably, the end cavity is an upward opening, the casting mold further comprises an upper mold cover, and the upper mold cover is used for covering the opening of the end cavity after the upper mold is buckled.
Preferably, the molding cavity at least comprises first molding cavities distributed at two ends of the casting mold, each first molding cavity comprises a bottom end face, a first inclined end face, a second inclined end face, a tail arc face, a third inclined end face, an upper end face and a vertical joint face which are sequentially connected end to end, the vertical joint face is arranged to be attached to an outer wall face of the vertical joint portion, a first opening is formed between the vertical joint face and the bottom end face, and the tail arc face and the first opening are arranged on opposite sides.
The technical problems to be solved by the invention are as follows: the second aspect provides an online casting molding process for a composite scraper, so that after casting molding, the composite scraper can efficiently meet the development requirement of light weight of coal equipment, and can simultaneously ensure the use effect of the composite scraper after long-time use, thereby prolonging the service life of the composite scraper.
In order to solve the technical problem of the second aspect, the invention provides an online casting molding process for a composite scraper, which comprises the following steps:
s1: starting the temperature-controlled pouring forming machine, removing the upper die, and moving the preheated special core insert into the lower die for preheating and heat preservation;
s2: moving the upper die to be right above the lower die and quickly closing the die;
s3: pouring the polyurethane mixed liquid from the opening of the upper die, and quickly buckling the upper die cover after the pouring is finished;
s4: completing one-time curing molding under the condition of preheating temperature and a normal-pressure standing state;
s5: removing the upper die cover and the upper die, and demolding the composite scraper product;
s6: and after trimming the composite scraper product, performing batch secondary curing, qualified inspection, packaging and warehousing.
Compared with the prior art, the online casting molding die and the molding process for the composite scraper have the following beneficial effects that:
1) after the composite scraper is formed, the development requirement of light weight of coal machine equipment can be met efficiently, the use effect of the composite scraper after long-time use can be guaranteed, and the service life of the composite scraper is further prolonged;
2) after the composite scraper is formed, the composite scraper can be better matched with original matching and assembling parts such as chains, pressing plates and bolts, the improvement of related matching equipment and the customized purchase of related special mounting tools are facilitated to be reduced, and the production cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and are not to limit the invention. In the drawings:
FIG. 1 is a schematic cross-sectional view of a composite screed according to the prior art, according to an embodiment of the present invention, in a front view;
fig. 2 is a schematic perspective view of a composite scraper blade on-line casting mold in a closed state according to embodiment 1 of the present invention;
fig. 3 is an exploded view of a composite scraper blade on-line casting mold in an operating state according to embodiment 1 of the present invention;
fig. 4 is a schematic perspective view of an upper mold according to embodiment 1 of the present invention;
fig. 5 is a schematic top view of an upper mold according to embodiment 1 of the present invention;
fig. 6 is a schematic perspective view of a lower mold according to embodiment 1 of the present invention;
FIG. 7 is a perspective view of a specialized core insert according to embodiment 1 of the present invention;
FIG. 8 is a schematic bottom view of a specialized core insert according to embodiment 1 of the present invention;
fig. 9 is an exploded schematic view of a front view half-section structure of an online casting mold for a composite scraper according to embodiment 1 of the present invention;
fig. 10 is a partially enlarged schematic view of a first molding cavity according to embodiment 1 of the present invention in a perspective sectional structure thereof.
Description of reference numerals:
100-body, 101-bolt hole, 102-flat link slot, 200-end body, 300-core insert, 400-cladding;
1-lower die, 11-main groove, 111-first step groove, 112-second step groove, 1121-positioning plug, 113-avoidance portion, 12-end groove, 2-upper die, 21-main cavity, 211-top hole, 212-third avoidance space, 213-platen seat, 214-flat chain seat, 215-vertical chain seat, 216-first avoidance space, 217-second avoidance space, 22-end cavity, 221-opening, 23-vertical joint, 24-groove protection frame, 241-reinforced groove frame, 25-die opening groove, 3-forming cavity, 31-first forming cavity, 311-vertical joint, 312-bottom end surface, 313-first oblique end surface, 314-tail arc surface, 315-second oblique end surface, 316-third oblique end surface, 317, an upper end face, 318, a first opening, 32, a second forming cavity, 4, a sealing strip, 41, a sealing groove and 5, an upper die cover;
6-dedicated core insert, 61-body, 611-weight-reduction groove, 612-stiffener, 613-first bolt hole, 614-platen groove, 615-vertical link groove, 616-leg, 62-wing body.
Detailed Description
In order to make the aforementioned objects, technical solutions and advantages of the present invention more comprehensible, the present invention is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only some of the embodiments constituting the present invention, and are not intended to limit the present invention, and the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, a composite scraper in the prior art includes a body 100 and end bodies 200 located at the left and right ends of the body 100, wherein the body 100 is provided with a plurality of bolt holes 101 through from top to bottom, and the lower portion of the body 100 is provided with a plurality of flat chain grooves 102, so as to facilitate the assembly of the composite scraper and a chain into a scraper chain after being pressed and assembled by pressing plates, bolts and nuts. When the composite scraper is machined and molded, the composite scraper is cast and molded by two groups of materials, namely a core insert 300 and a cladding 400, wherein the core insert 300 is made of a metal material, generally low alloy steel, and the cladding 400 is made of a non-metal material, generally wear-resistant resin.
Example 1
As shown in fig. 2-10, the invention provides an online casting mold for a composite scraper, which includes a lower mold 1 and an upper mold 2, wherein the lower mold 1 includes a main groove 11 and end grooves 12 communicated with the left and right ends of the main groove 11, the upper mold 2 includes a main cavity 21 and end cavities 22 located at the left and right ends of the main cavity 21, a vertical joint portion 23 is disposed along a position close to the end cavities 22 in the main cavity 21, slot protection frames 24 protruding downward are disposed on the front and rear sides of the main cavity 21, the main groove 11 includes a first step groove 111 adapted to the slot protection frame 24, and after the upper mold 2 and the lower mold 1 are connected by locking, the slot protection frame 24 is locked in the first step groove 111 to form a molding cavity 3.
Specifically, as shown in fig. 1, when the composite scraper operates in a severe installation environment and under a complex extreme load condition, the joint of the flat chain groove 102 and the chain is most prone to wear due to the largest traction force, and further, the joint of the vertical chain groove (not shown in fig. 1, and reference may be made to the vertical chain groove 615 in fig. 8) and the chain is also more prone to wear due to the lower part of the bolt hole 101 and the joint of the pressure plate, the bolt, and the nut. In the prior art, the casting molding mode of the composite scraper blade during processing and molding is not reasonable, so that the structural strength of the composite scraper blade is low, the composite scraper blade is light in weight by excessively replacing the composite scraper blade by sacrificing the necessary structural strength of the composite scraper blade, and the excessive replacement leads to the fact that the composite scraper blade is not ideal in use effect.
Research and experiments show that the dead weight of the scraper can be reduced by 33-40% only by carrying out full-wrapping type compression molding or pouring molding on the end body 200, and after the end body 200 is fully wrapped and molded by non-metallic materials such as wear-resistant resin and the like, the using effect of the scraper cannot be influenced by the moderate reduction of all aspects of performance (including no size) of the end body 200, and phenomena such as 'unsmooth conveying operation, serious local abrasion and even chain breakage caused in serious conditions' cannot occur.
More specifically, when the composite scraper is molded by casting using the casting mold of the present invention, the core insert 300 used in the casting process may form a special matching sleeve design with the casting mold, as shown in fig. 7-8, which is a schematic structural diagram of the special core insert 6 of the present invention, and when the special core insert 6 is configured, the main body 61 of the special core insert 6 may be designed to be retained with reference to the original structural size of the main body 100 of the conventional low alloy steel scraper. Thus, when the composite blade is cast, the dedicated core insert 6 is first placed in the lower mold 1 in the reverse direction, the main body 61 of the dedicated core insert 6 falls into the main groove 11, and the wing bodies 62 thereof are kept in the tilted state in the end groove 12. Then, after the upper mold 2 and the lower mold 1 are locked and connected, the vertical joint part 23 provides a tight pressing fit vertically downward for the main body 61, the main cavity 21 covers most or all of the main body 61, and the slot-protecting frame 24 encloses the main body 61 in the front-back direction. Under the action of tightly pressing and enclosing the vertical joint part 23, the special core insert 6 and the slot-protecting frame 24 together, most or all of the main cavity 21 is completely isolated from the end cavity 22, at this time, the part of the molding cavity 3 corresponding to the end cavity 22, namely the end cavity 22, the end slot 12, the vertical joint part 23 and the first molding cavity 31 formed by enclosing the main body 61, also divides the wing body 62 into an upper part and a lower part, the upper part and the lower part are communicated only at the tail end and at least fully wrap the whole wing body 62, and the composite scraper can only perform casting molding of a non-metal material on the first molding cavity 31 during machining and molding, so that the composite scraper can only form the coating layer 400 of the fully wrapped non-metal material on the end body 200 after machining and molding.
Of course, according to the specific opening position of the vertical joint portion 23, the first molding cavity 31 may also fully wrap the small part of the main body 61, so that after the composite scraper is only molded by pouring the non-metal material into the first molding cavity 31, the formation of the fully wrapped non-metal material cladding layer 400 on the small part of the main body 100 may also be simultaneously achieved, and meanwhile, since the small part of the main body 100 is located outside the flat chain groove 102, the requirements on the tensile strength and the wear resistance are also low, thereby being beneficial to further reducing the weight of the composite scraper without affecting the use effect of the composite scraper.
According to the invention, through the arrangement of the casting mold, the composite scraper can be cast and molded only by fully wrapping the wing body 62 of the special core insert 6 at least during processing and molding, and the structural strength of the body 100 of the composite scraper is kept unchanged after molding, so that the development requirement of light weight of coal equipment can be met efficiently, the structural strength of the composite scraper can be improved greatly, the use effect of the composite scraper after long-time use can be guaranteed, and the service life of the composite scraper can be prolonged. In addition, after the composite scraper is formed, the body 100 can be kept with the original structural dimension design of the low-alloy steel scraper, and can be better matched with original matching and assembling parts such as chains, pressing plates and bolts, so that the improvement of related matching equipment and the customized purchase of related special mounting tools are facilitated to be reduced, and the production cost is reduced.
Preferably, the main groove 11 further includes a second step groove 112 closely attached to the inner side of the first step groove 111, and the second step groove 112 is communicated with the end groove 12.
Specifically, when the composite scraper is in operation, the upper portion of the bolt hole 101 does not need to be in direct contact with the chain, that is, the upper region of the composite scraper body 100 is corresponding to, and the tensile strength and the wear resistance of the region do not need to be designed to be very superior, and the cladding layer 400 can be formed completely by casting and molding the non-metal composite material, so that further weight reduction of the composite scraper is realized.
More specifically, through the arrangement of the second stepped groove 112, the dedicated core insert 6 may further be provided with a weight-reducing groove 611 and reinforcing ribs 612 located on both sides of the weight-reducing groove 611. Therefore, when the composite scraper is cast and molded, when the special core insert 6 is reversely placed in the lower die 1, the main body 61 of the special core insert 6 still falls into the main groove 11, but at the same time, the reinforcing rib 612 is reversely placed in the second stepped groove 112 and abuts against the first stepped groove 111, and then after the upper die 2 and the lower die 1 are locked and connected, the groove protecting frame 24 is downwards locked in the first stepped groove 111 and still provides a front-back enclosure for the main body 61, at this time, under the supporting action of the reinforcing rib 612, the part of the molding cavity 3 corresponding to the weight reducing groove 611, namely, the second stepped groove 112 and the weight reducing groove 611, will also enclose and form the second molding cavity 32, and the second molding cavity 32 will be communicated with the first molding cavity 31. When the composite scraper is subjected to casting molding, the second molding cavity 32 can be subjected to non-metal material casting molding, so that the composite scraper is further lightened, the overall structural strength of the composite scraper cannot be influenced, meanwhile, the structure of the second molding cavity 32 is greatly convenient for the casting of non-metal materials such as wear-resistant resin, and the non-metal materials such as the wear-resistant resin can flow from the first molding cavity 31 to the second molding cavity 32.
Preferably, a plurality of positioning plugs 1121 are also fixedly disposed in the second step groove 112.
Specifically, as shown in fig. 1, after the composite scraper is molded by casting, a plurality of bolt holes 101 need to be formed through the body 100 from top to bottom, so that the composite scraper and the chain can be assembled into the scraper chain after being pressed by the pressing plate, the bolts and the nuts. When a plurality of positioning plugs 1121 are further fixedly arranged in the second stepped groove 112, when the composite scraper is molded by casting, the dedicated core insert 6 itself is further provided with a first bolt hole 613 for the positioning plug 1121 to pass through, and the positioning plug 1121 is used for positioning and placing the dedicated core insert 6, so that the assembly accuracy and the assembly efficiency of the dedicated core insert 6 and the lower die 1 can be greatly improved; meanwhile, when the composite scraper plate is poured into the second forming cavity 32, the composite scraper plate can be greatly convenient to be formed at one time after pouring, and the subsequent drilling processing of the composite scraper plate is avoided. More specifically, after the composite blade is cast and successfully demolded, the composite blade is separated from the positioning plug 1121, and the coating layer 400 cast from the non-metallic material forms a second bolt hole below the first bolt hole 613, and the second bolt hole and the first bolt hole 613 together form the bolt hole 101 of the composite blade.
Preferably, a plurality of top piece holes 211 penetrate upwards through the main cavity 21, and projections of the top piece holes 211 and the positioning plugs 1121 on a horizontal plane are not overlapped with each other.
Specifically, the composite scraper is after casting, and first molding cavity 31 can be filled to full by non-metallic composite casting's coating 400, goes up mould 2 and may have the die sinking difficulty, and the setting in kicking off hole 211 will greatly make things convenient for the composite scraper to carry out appropriate reverse application of force to the composite scraper with the help of the kicking off instrument after casting to make go up mould 2 easily and the separation that drops of composite scraper.
Preferably, an open mold cavity 25 is opened on the outer side of the upper mold 2 close to the end cavity 22.
Specifically, the mold opening groove 25 can be matched with the ejector piece hole 211, so that the mold opening process under various extreme mold opening working conditions is greatly facilitated.
Preferably, a pressing plate seat 213, a flat chain seat 214 and a vertical chain seat 215 which protrude downwards are arranged in the main cavity 21, a first avoidance space 216 is formed between the pressing plate seat 213 and the slot guard frame 24, and a second avoidance space 217 is formed between the flat chain seat 214 and the vertical chain seat 215 in a surrounding manner.
Specifically, after the composite scraper is formed, the composite scraper is assembled into a scraper chain after being compressed and assembled with a chain through a pressing plate, a bolt and a nut, a flat chain groove 102, a vertical chain groove 615 and a pressing plate groove 614 are respectively formed in the lower portion of a body 100 of the composite scraper, a pressing plate seat 213, a flat chain seat 214, a vertical chain seat 215, a first avoidance space 216 and a second avoidance space 217 are arranged, after an upper die 2 and a lower die 1 are connected in a locking mode, a main cavity 21 at least forms fixing limit on a special core insert 6 between vertical joint parts 23, the special core insert 6 is prevented from shifting in the pouring process, meanwhile, high-temperature pouring liquid is prevented from continuously flowing into the main cavity 21 from the vertical joint parts 23, and the forming quality of the composite scraper is prevented from being influenced.
Preferably, said main chamber 21 also comprises at least one of the following settings:
1) the top piece hole 211 is arranged on the pressing plate seat 213 in a penetrating way;
2) the platen seat 213 includes an extension section that penetrates through the vertical joint portion 23 along the length direction thereof and extends to the end cavity 22, the first avoidance space 216 penetrates through the vertical joint portion 23 and includes a third avoidance space 212 formed between the extension section and the slot guard frame 24, and the third avoidance space 212 is communicated with the end cavity 22;
3) the flat chain seat 214 and the vertical chain seat 215 are arranged close to the inner side wall of the slot protecting frame 24, and the downward protruding height of the vertical chain seat 215 is higher than the downward protruding height of the slot protecting frame 24 and forms a reinforcing slot frame 241 of the slot protecting frame 24.
Specifically, the pressing plate seat 213 is adapted to the pressing plate groove 614 of the special core insert 6, and when the ejecting member hole 211 is opened on the pressing plate seat 213, the force of the ejecting member will be located at the center of the composite scraper, which is beneficial to stably realizing the falling and separation of the upper die 2 and the composite scraper. For the further arrangement of the vertical joint portion 23 and the platen base 213, the first avoiding space 216, and the third avoiding space 212, when the composite blade is molded by casting, the platen groove 614 of the special core insert 6 or the support legs 616 at both sides of the platen groove 614 may be arranged in a non-penetrating manner, and then the third avoiding space 212 is filled with the poured non-metal material, and then after the composite blade is molded, the platen groove 614 is arranged in a penetrating manner along the length direction of the body 100, which is beneficial for the compression fit of the composite blade and the chain, and meanwhile, the cladding layer 400 molded by casting at the third avoiding space 212 is located outside the flat chain groove 102, which has low requirements on tensile strength and wear resistance, and does not affect the use effect of the composite blade while contributing to further weight reduction of the composite blade. The arrangement of the reinforcing slot frame 241 not only makes the reinforcing slot frame 241 more tightly enclose the special core insert 6 in the front-back direction, but also makes it more convenient to lock the slot protecting frame 24 in the first stepped slot 111 in the vertical direction, so that the tight press fit of the main cavity 21 on the special core insert 6 in the vertical direction is more guaranteed. At this moment, the transition step of the first step groove 111 and the second step groove 112 can be further provided with an avoiding portion 113, the avoiding portion 113 is used for being in snap fit with the reinforcing groove frame 241, so that the vertical chain seat 215 can tightly enclose the vertical chain groove 615 of the special core insert 6, and further the main groove 11 can be used for fixing and limiting the special core insert 6, the special core insert 6 is prevented from shifting in the pouring process, and meanwhile, under an extreme working condition, high-temperature pouring liquid is prevented from continuously overflowing out of the second step groove 112 from the reinforcing rib 612 through the vertical chain groove 615, so that the forming quality of the composite scraper is not influenced.
Preferably, the casting mold further includes a sealing strip 4, and a sealing groove 41 adapted to the sealing strip 4 is formed in one or more positions of the lower mold 1 corresponding to the outer peripheral side of the groove guard 24, the lower end of the vertical joint 23, and the second stepped groove 112.
Specifically, in the casting process of the composite scraper, in order to prevent the high-temperature casting liquid in the first molding cavity 31 and/or the second molding cavity 32 from permeating to other directions, the casting mold further includes a sealing strip 4, and the sealing strip 4 is installed in the sealing groove 41 and used for expanding at high temperature to prevent the high-temperature casting liquid in the first molding cavity 31 and/or the second molding cavity 32 from permeating to other directions. More specifically, the sealing groove 41 is used to prevent the high-temperature casting liquid in the molding chamber 3 from permeating in the circumferential direction, the high-temperature casting liquid in the first molding cavity 31 from continuously permeating into the main cavity 21 from the vertical joint 23, and the high-temperature casting liquid in the second molding cavity 32 from continuously permeating to the outside of the second stepped groove 112 from the stringer groove 615 to the bead 612 of the special core insert 6, respectively.
Preferably, the end cavity 22 is provided with an upward opening, the casting mold further includes an upper mold cover 5, and the upper mold cover 5 is used for covering the opening 221 of the end cavity 22 after the upper mold 2 is fastened.
Specifically, in the pouring process, the opening 221 may serve as a pouring gate, and the high-temperature pouring liquid may flow into the first molding cavity 32 from the pouring gate through the first molding cavity 31, and stop pouring until the liquid level in the first molding cavity 31 reaches a preset liquid level, and then buckle the upper mold cover 5 to perform pressure maintaining, cooling and shaping.
Preferably, the molding cavity 3 at least includes a first molding cavity 31 distributed at two ends of the casting mold, the first molding cavity 31 includes a bottom end surface 311, a first oblique end surface 312, a second oblique end surface 313, a tail arc surface 314, a third oblique end surface 315, an upper end surface 316, and a vertical joint surface 317 sequentially joined end to end, the vertical joint surface 317 is disposed closely to an outer wall surface of the vertical joint portion 23, a first opening 318 is disposed between the vertical joint surface 317 and the bottom end surface 311, and the tail arc surface 314 is disposed at an opposite side to the first opening 318.
Specifically, in the casting mold, when the dedicated core insert 6 is placed in the reverse direction, it usually means that the casting mold is in the casting process, at this time, the first opening 318 is blocked by the main body 61 of the dedicated core insert 6, and the first molding cavity 31 is divided into the upper portion and the lower portion by the wing body 62 of the dedicated core insert 6, and the upper portion and the lower portion are only communicated at the tail end and fully wrap the wing body 62, which means that the first molding cavity 31 is completely activated under the action of the dedicated core insert 6. The multi-surface design of the first molding cavity 31 is beneficial to improving the bonding and wrapping area and the bonding and wrapping strength between the coating 400 and the special core insert 6 of the composite scraper after casting molding, so as to enhance the overall structural strength of the composite scraper, and simultaneously ensure that the coating 400 at the end body 200 of the composite scraper can have enough thickness and length, so that when the composite scraper is lightened to the maximum extent and is matched with the middle groove, the thickness of the wear-resistant resin layer is improved on the premise of ensuring that the composite scraper has enough service strength, and the wear resistance of the contact surface of the composite scraper and the middle groove is ensured.
Preferably, a smooth arc is adopted between each joint surface of the forming chamber 3.
When the joint surfaces are further subjected to smooth radian processing, on one hand, when the end body 200 of the composite scraper is cast, the interface bonding and wrapping area of the coating layer 400 can be further increased, and the bonding strength with non-metal materials such as wear-resistant resin and the like is further effectively ensured; on the other hand, after the composite scraper is cast and molded, the stress shearing action of the special core insert 6 on the coating layer 400 can be effectively reduced, and the probability or occurrence time of falling off of the interface bonding coating part after long-time use is reduced or delayed.
Preferably, the molding chamber 3 further includes a second molding cavity 32 located in the middle of the casting mold and communicated with the first molding cavity 31, and the bottom end surface 311 extends inward in the horizontal direction until the first molding cavities 31 distributed at the two ends of the casting mold are communicated through the second stepped groove 112.
Specifically, in the casting mold, when the special core insert 6 with the weight-reducing groove 611 is placed in the reverse direction, the main body 61 of the special core insert 6 does not need to completely block the first opening 318, and a small gap may be optionally left in the lower portion of the first opening 318, so that the small gap may be surrounded by the reinforcing rib 612 in the front-back direction and simultaneously may be communicated with the weight-reducing groove 611 in the left-right direction, at this time, the second molding cavity 32 will be completely activated under the action of the special core insert 6 and is communicated with the first molding cavity 31 through the small gap, thereby further weight reduction of the composite scraper may be realized, the overall structural strength of the composite scraper may not be affected, and meanwhile, it will be greatly convenient for the high-temperature casting liquid to flow in the direction of the second molding cavity 32 in time during casting.
Meanwhile, it should be noted here that the platen base 213 and the extension thereof are only disposed at the center of the main cavity 21, and a first avoiding space 216 and a third avoiding space 212 thereof are formed between the platen base 213 and the shroud groove frame 24, and while the extension of the platen base 213 extends to the end cavity 22 after penetrating through the vertical joint portion 23 along the length direction, it cannot block the first opening 318 in the vertical direction, and only occupies a certain physical space in the first molding cavity 31, so as to facilitate the further weight reduction of the composite screed body 100 and the cast molding of the composite screed body 100 at this position into the full-through platen groove 614.
Example 2
The invention also provides an online casting molding process of the composite scraper, which adopts an online casting molding die of the composite scraper and comprises the following steps:
s1: starting the temperature-controlled pouring forming machine, moving away the upper die 2, and moving the preheated special core insert 6 into the lower die 1 for preheating and heat preservation;
s2: moving the upper die 2 to the position right above the lower die 1 and quickly closing the dies;
s3: pouring the polyurethane mixed liquid from the opening 221 of the upper die 2, and quickly buckling the upper die cover 5 after pouring;
s4: completing one-time curing molding under the condition of preheating temperature and a normal-pressure standing state;
s5: removing the upper die cover 5 and the upper die 2, and demolding the composite scraper product;
s6: and after trimming the composite scraper product, performing batch secondary curing, qualified inspection, packaging and warehousing.
Specifically, the preheating and heat-preserving temperature in the step S1 may be 80 ℃ to 120 ℃, and the polyurethane mixed liquid in the step S3 is prepared by using a polyurethane prepolymer composed of polyester or polyether polyol and polyisocyanate as a resin matrix of the wear-resistant resin layer, and adding functional additives such as a chain extender, a reinforcing agent, a wear-resistant agent, an antistatic agent, a flame retardant and the like. The material has excellent oil resistance, corrosion resistance and wear resistance, has good buffering, energy absorption, noise reduction and mechanical strength, can effectively reduce the weight of a single scraper and reduce the abrasion of the scraper and a middle groove, further reduces the maintenance cost of equipment, and improves the service life and the production efficiency of the equipment.
Preferably, before step S1, the process further includes the steps of:
ST 1: derusting and cleaning the casting mold, coating a release agent and preheating;
ST 2: derusting and cleaning the special core insert 6, performing shot blasting and sand blasting, performing secondary cleaning, activating the surface, and performing gluing and preheating treatment;
ST 3: preheating and vacuum defoaming the polyurethane prepolymer by using a hot air circulating system;
ST 4: quantitatively and uniformly mixing functional additives including a chain extender, a reinforcing agent, a wear-resisting agent, an antistatic agent and a flame retardant, and then preheating and vacuum defoaming;
ST 5: and (3) coating a release agent on the main groove 11, the end groove 12, the main cavity 21 and the end cavity 22.
Specifically, the preheating temperature in step ST1 may be 90 to 140 ℃, the preheating temperature in step ST3 may be 60 to 100 ℃, and the preheating temperature in step ST4 may be 60 to 140 ℃.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides an online casting forming die of compound scraper blade, its characterized in that, includes lower mould (1), goes up mould (2), lower mould (1) including main groove (11) and with end groove (12) of both ends intercommunication about main groove (11), go up mould (2) including main cavity (21) and be located end chamber (22) at both ends about main cavity (21), along being close to in main cavity (21) end chamber (22) department has seted up perpendicular joint portion (23), both sides distribute around main cavity (21) and be protection tank tower (24) that downward protrusion set up, main groove (11) include with protect first step groove (111) of tank tower (24) looks adaptation, go up mould (2) with lower mould (1) hasp is connected the back, protect tank tower (24) lock in and form molding cavity (3) in first step groove (111).
2. The online casting molding die for the composite scraper blade as claimed in claim 1, wherein the main groove (11) further comprises a second stepped groove (112) closely attached to the inner side of the first stepped groove (111), and the second stepped groove (112) is communicated with the end groove (12).
3. The online casting molding die for the composite scraper blade as claimed in claim 2, wherein a plurality of positioning plugs (1121) are further fixedly arranged in the second stepped groove (112).
4. The online casting molding mold for the composite scraper blade of claim 3, wherein a plurality of top piece holes (211) are formed in the main cavity (21) in an upward penetrating manner, and projections of the top piece holes (211) and the positioning plugs (1121) on a horizontal plane are not overlapped with each other.
5. The online casting molding mold for the composite scraper blade of claim 4, wherein a pressing plate seat (213), a flat chain seat (214) and a vertical chain seat (215) are arranged in the main cavity (21) in a downward protruding manner, a first avoidance space (216) is formed between the pressing plate seat (213) and the groove protecting frame (24), and a second avoidance space (217) is formed between the flat chain seat (214) and the vertical chain seat (215).
6. The composite blade online casting molding mold according to claim 5, wherein the main cavity (21) further comprises at least one of the following:
1) the top piece hole (211) penetrates through the pressing plate seat (213);
2) the pressing plate seat (213) comprises an extension section which penetrates through the vertical joint part (23) along the length direction of the pressing plate seat and extends to the end cavity (22), the first avoidance space (216) penetrates through the vertical joint part (23) and comprises a third avoidance space (212) formed between the extension section and the slot protecting frame (24), and the third avoidance space (212) is communicated with the end cavity (22);
3) the flat chain seat (214) and the vertical chain seat (215) are arranged close to the inner side wall of the groove protecting frame (24), and the downward protruding height of the vertical chain seat (215) is higher than the downward protruding height of the groove protecting frame (24) and forms a reinforcing groove frame (241) of the groove protecting frame (24).
7. The online casting mold for the composite scraper blade according to any one of claims 2-6, characterized in that the casting mold further comprises a sealing strip (4), and the lower mold (1) is provided with a sealing groove (41) adapted to the sealing strip (4) corresponding to any one or more of the outer peripheral side of the groove guard frame (24), the lower end of the vertical joint part (23) and the second stepped groove (112).
8. The online casting mold for the composite scraping plate as claimed in any one of claims 1-6, wherein the end cavity (22) is arranged in an upward opening manner, the casting mold further comprises an upper mold cover (5), and the upper mold cover (5) is used for covering the opening (221) of the end cavity (22) after the upper mold (2) is buckled.
9. The online casting mold for the composite scraper blade of any one of claims 1-6, wherein the molding cavity (3) at least comprises first molding cavities (31) distributed at two ends of the casting mold, the first molding cavities (31) comprise a bottom end surface (311), a first inclined end surface (312), a second inclined end surface (313), a tail arc surface (314), a third inclined end surface (315), an upper end surface (316) and a vertical joint surface (317) which are sequentially joined end to end, the vertical joint surface (317) is closely attached to an outer wall surface of the vertical joint portion (23), a first opening (318) is formed between the vertical joint surface (317) and the bottom end surface (311), and the tail arc surface (314) and the first opening (318) are arranged at opposite sides.
10. The on-line casting molding process of the composite scraper is characterized by comprising the following steps of:
s1: starting the temperature-controlled pouring forming machine, moving away the upper die (2), and moving the preheated special core insert (6) into the lower die (1) for preheating and heat preservation;
s2: moving the upper die (2) to be right above the lower die (1) and quickly closing the dies;
s3: pouring of the polyurethane mixed liquid is carried out from the open (221) of the upper die (2), and the die cover (5) is quickly buckled after pouring is finished;
s4: completing one-time curing molding under the condition of preheating temperature and a normal-pressure standing state;
s5: removing the upper die cover (5) and the upper die (2) and demolding the composite scraper product;
s6: and after trimming the composite scraper product, performing batch secondary curing, qualified inspection, packaging and warehousing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110678832 | 2021-06-18 | ||
| CN2021106788329 | 2021-06-18 |
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| CN114454401A true CN114454401A (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110956392.9A Pending CN114454401A (en) | 2021-06-18 | 2021-08-19 | Online casting molding die and molding process for composite scraper |
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| DE10231875B3 (en) * | 2002-07-12 | 2004-02-19 | Dbt Gmbh | Chute and scraper for scraper chain conveyor for underground mining, esp. for coal has wear-resistant inserts of oxide ceramics, and protective inserts of wear-resistant steel in chute and scrapers |
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