A composite scraper online compression molding die and molding process

Abstract

The present invention provides an online compression molding die and molding process for a composite scraper, comprising an upper die and a lower die, wherein the upper die comprises a main cavity and end cavities connected to the left and right ends of the main cavity, the lower die comprises a main groove and end grooves located at the left and right ends of the main groove, a vertical joint is provided between the main groove and the end groove, and groove guard frames protruding upward are provided on the front and rear sides of the main groove, the main cavity comprises a first stepped cavity adapted to the groove guard frame, after the upper die is locked and connected with the lower die, the first stepped cavity covers the groove guard frame and forms a molding chamber. Through the online compression molding die and molding process for a composite scraper described in the present invention, after compression molding, the composite scraper can not only efficiently meet the development requirements of lightweight coal machinery equipment, but also ensure its use effect after long-term use, thereby improving the service life of the composite scraper.

Description

Technical Field

[0001] The invention relates to the technical field of composite scraper processing and forming, in particular to an online compression molding die and a molding process for a composite scraper. Background Art

[0002] Scraper conveyor equipment is a continuous conveying machine that fixes the scraper on the chain as a traction component to transport materials in the middle trough. It has the advantages of large transportation capacity, wide adaptability to the environment and simple maintenance, and is widely used in coal mine fully mechanized working faces. In the scraper conveyor equipment, the scraper and the pressure plate, bolts, nuts and chains form the scraper chain, which is the direct actuator that drives the transported materials to move.

[0003] At present, in coal mining machinery and transportation equipment, the scrapers are all integral forged structures of low-alloy steel, and the manufacturing process is: die forging → machining → heat treatment. The material used is generally 40Mn2 or 27SiMn. As a result, the coal mining machinery and transportation equipment itself is heavy, and a large part of the motor load energy consumption is consumed by the coal mining machinery and transportation equipment itself, which limits the transportation capacity of the coal mining machinery and transportation equipment and even the production efficiency of the entire set of coal mining equipment; at the same time, due to the large wear of the steel scraper assembly on the bottom of the coal mining machinery and transportation equipment, the complete set of equipment is seriously damaged, with a short life and low production efficiency.

[0004] As an improvement, a large number of researchers in the coal mining equipment industry are also studying how to improve metal scrapers into composite types of non-metallic materials and metal core plates. The production process has been changed from the original forging machine processing to placing the forged metal core plate in a mold and directly pouring non-metallic materials to form it, thereby reducing the installed load of scraper conveying equipment for coal mines, and to a large extent, it has indeed met the development requirements of lightweight coal mining equipment, but the use effect is not ideal. For example, the composite scraper itself has a low structural strength, and it often needs to operate in harsh installation environments and complex extreme load conditions. After a period of use, its tensile strength, wear resistance, flame retardancy, antistatic properties, etc. will be further reduced, and it is often accompanied by poor transportation operation and severe local wear. In severe cases, it may even cause the chain to break, resulting in a service life that is seriously less than expected. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is: the first aspect is to provide an online compression molding die for a composite scraper, so that after compression molding, the composite scraper can not only efficiently meet the development requirements of lightweight coal machinery equipment, but also ensure its use effect after long-term use, thereby improving the service life of the composite scraper.

[0006] In order to solve the above-mentioned technical problem of the first aspect, the present invention provides an online compression molding die for a composite scraper, comprising an upper die and a lower die, the upper die comprising a main cavity and end cavities connected to the left and right ends of the main cavity, the lower die comprising a main groove and end grooves located at the left and right ends of the main groove, a vertical joint portion is provided between the main groove and the end grooves, and groove protection frames protruding upward are distributed on the front and rear sides of the main groove, the main cavity comprises a first stepped cavity adapted to the groove protection frame, after the upper die is locked and connected with the lower die, the first stepped cavity covers the groove protection frame and forms a molding chamber.

[0007] Preferably, the main cavity further comprises a second stepped cavity arranged closely to the inner side of the first stepped cavity, and the second stepped cavity is communicated with the end cavity.

[0008] Preferably, the compression molding die further comprises a plurality of positioning plugs, the upper ends of the positioning plugs are provided with threaded holes, and / or the main grooves are provided with top plug holes extending downwardly.

[0009] Preferably, the main groove is further provided with a top piece hole penetrating downward.

[0010] Preferably, the main groove is provided with an upwardly protruding pressure plate seat, a flat chain seat, and a first vertical chain seat, a first escape space is formed between the pressure plate seat and the groove protection frame, and a second escape space is enclosed between the flat chain seat and the first vertical chain seat.

[0011] Preferably, the main slot also includes at least one of the following settings:

[0012] 1) The top plug hole and the top piece hole are both opened through the pressure plate seat;

[0013] 2) The vertical joint is arranged close to the end surface of the pressure plate seat and its height is equal to the height of the pressure plate seat, and the first avoidance space passes through the vertical joint and is connected to the end groove;

[0014] 3) The flat chain seat and the first vertical chain seat are both arranged close to the inner side wall of the groove protection frame. The height of the first vertical chain seat is equal to the height of the groove protection frame and constitutes a reinforced groove frame of the groove protection frame.

[0015] Preferably, the second stepped cavity is open upward, and the compression molding die further comprises an upper die cover, and the upper die cover is used to cover the second stepped cavity after the upper die is buckled.

[0016] Preferably, the molding chamber at least includes a first molding cavity distributed at both ends of the compression molding die, the first molding cavity includes a vertical joint surface, a bottom end surface, a first inclined end surface, a tail arc surface, a second inclined end surface, and a third inclined end surface which are sequentially connected from head to tail, the vertical joint surface is arranged tightly against the outer wall surface of the vertical joint portion, a first opening is formed between the vertical joint surface and the third inclined end surface, and the tail arc surface is arranged on opposite sides of the first opening.

[0017] The technical problem to be solved by the present invention is also: the second aspect proposes an online compression molding process for a composite scraper, so that after compression molding, the composite scraper can not only efficiently meet the development requirements of lightweight coal machinery equipment, but also ensure its use effect after long-term use, thereby improving the service life of the composite scraper.

[0018] In order to solve the above-mentioned second technical problem, the present invention proposes an online compression molding process for a composite scraper, comprising the following steps:

[0019] S1: Start the temperature-controlled compression molding machine, remove the upper mold, take an appropriate amount of blank and place it in the end cavity;

[0020] S2: Move the preheated special core insert into the lower mold and place it on the lower mold, and use the positioning plug to embed and position it;

[0021] S3: Take an appropriate amount of blank again and place it in the weight-reducing groove of the special core insert;

[0022] S4: Move the upper mold to the top of the lower mold, start the temperature-controlled compression molding machine, and quickly close the mold by moving the slider downward;

[0023] S5: After the mold is closed once and the molding is finalized, the slider of the temperature-controlled compression molding machine is started to move upward to complete the open exhaust;

[0024] S6: Move the upper mold to the top of the lower mold, start the temperature-controlled compression molding machine and move the slider downward to complete the secondary mold closing;

[0025] S7: After the secondary mold closing, the slider of the temperature-controlled compression molding machine is started to move upward, the upper mold is opened, and the positioning plug and the molded composite scraper product are ejected in sequence;

[0026] S8: After trimming, the formed composite scraper products are inspected for product quality and packaged for storage;

[0027] S9: Execute steps S1-S8 in a loop.

[0028] Preferably, the present invention also proposes another online compression molding process for a composite scraper, comprising the following steps:

[0029] S1: Start the temperature-controlled compression molding machine, remove the upper mold, take an appropriate amount of blank and place it in the end cavity;

[0030] S2: Move the preheated special core insert into the lower mold and place it on the lower mold, and use the positioning plug to embed and position it;

[0031] S3: Take an appropriate amount of blank again and place it in the weight-reducing groove of the special core insert;

[0032] S4: Move the upper mold to the top of the lower mold, start the temperature-controlled compression molding machine, and quickly close the mold by moving the slider downward;

[0033] S5': the temperature-controlled compression molding machine performs one-step mold closing and molding in an open exhaust mode;

[0034] S6': Move the upper mold cover to the top of the upper mold for quick closing to complete the secondary mold closing;

[0035] S7': After the secondary mold closing and pressure-maintaining cooling and shaping, the slider of the temperature-controlled compression molding machine is started to move upward, the upper mold cover and the upper mold are opened, and the positioning plug and the molded composite scraper product are ejected in sequence;

[0036] S8: After trimming, the formed composite scraper products are inspected for product quality and packaged for storage;

[0037] S9: Execute steps S1-S8 in a loop.

[0038] Compared with the prior art, the composite scraper online molding die and molding process described in the present invention have the following beneficial effects:

[0039] 1) After the composite scraper is formed, it can not only efficiently meet the development requirements of lightweight coal mining equipment, but also ensure its use effect after long-term use, thereby increasing the service life of the composite scraper;

[0040] 2) After the composite scraper is formed, it can be better adapted to the original matching assembly parts such as chains, pressure plates, bolts, etc., which helps to reduce the modification of related supporting equipment and the customized purchase of related special installation tools, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0042] Figure 1 It is a cross-sectional schematic diagram of the main structure of a composite scraper in the prior art described in a specific embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of the three-dimensional structure of the online compression molding mold of a composite scraper described in Example 1 of the present invention in a mold-closing state;

[0044] Figure 3It is a schematic diagram of the exploded structure of the composite scraper online compression molding die in working state described in Example 1 of the present invention;

[0045] Figure 4 This is a schematic diagram of the three-dimensional structure of a lower mold described in Example 1 of the present invention;

[0046] Figure 5 This is a schematic diagram of a top view of the structure of a lower mold described in Example 1 of the present invention;

[0047] Figure 6 This is a schematic diagram of the three-dimensional structure of an upper mold described in Example 1 of the present invention;

[0048] Figure 7 This is a schematic diagram of the three-dimensional structure of a special core insert described in Example 1 of the present invention;

[0049] Figure 8 It is a bottom view structural schematic diagram of a special core insert described in Example 1 of the present invention;

[0050] Fig. 9 This is a schematic diagram of the main cross-sectional structure of a positioning plug described in Example 1 of the present invention;

[0051] Fig.10 It is an exploded schematic diagram of a front view half-section structure of an online compression molding die for a composite scraper described in Example 1 of the present invention;

[0052] Fig.11 It is a partially enlarged schematic diagram of the main structure of a first molding cavity described in Example 1 of the present invention.

[0053] Description of reference numerals:

[0054] 100-body, 101-bolt hole, 102-flat chain groove, 200-end body, 300-core insert, 400-cladding layer;

[0055] 1-upper die, 11-main cavity, 111-first step cavity, 112-second step cavity, 1121-second vertical chain seat, 12-end cavity, 13-exhaust groove, 2-lower die, 21-main groove, 211-top plug hole, 212-top piece hole, 213-pressing plate seat, 214-flat chain seat, 215-first vertical chain seat, 216-first avoidance space, 217-second avoidance space, 22-end groove, 23-vertical joint 24-groove protection frame, 241-reinforcement groove frame, 242-tail groove frame, 3-molding chamber, 31-first molding cavity, 311-vertical joint surface, 312-bottom end surface, 313-first oblique end surface, 314-tail arc surface, 315-second oblique end surface, 316-third oblique end surface, 317-upper end surface, 318-first opening, 32-second molding cavity, 4-positioning plug, 41-threaded hole, 5-upper mold cover;

[0056] 6-special core insert, 61-main body, 611-weight reduction groove, 612-strengthening rib, 613-first bolt hole, 614-pressure plate groove, 615-vertical chain groove, 62-wing body. DETAILED DESCRIPTION

[0057] In order to make the above-mentioned purpose, technical scheme and advantages of the present invention more clear and easy to understand, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments of the present invention described herein only constitute part of the embodiments of the present invention, which are only used to explain the present invention and do not constitute a limitation of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0058] like Figure 1 As shown, 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. The body 100 is provided with a plurality of bolt holes 101 from top to bottom, and a plurality of flat chain grooves 102 are provided at the bottom of the body 100 to facilitate the composite scraper and the chain to be assembled into a scraper chain after being pressed and assembled by a pressing plate, bolts, and nuts. When the composite scraper is processed and formed, it is cast by two groups of materials, a core insert 300 and a coating layer 400, wherein the core insert 300 is a metal material, usually low alloy steel, and the coating layer 400 is a non-metal material, usually wear-resistant resin.

[0059] Example 1

[0060] like Figure 2-11As shown, the present invention provides an online compression molding die for a composite scraper, comprising an upper die 1 and a lower die 2, wherein the upper die 1 comprises a main cavity 11 and an end cavity 12 connected to the left and right ends of the main cavity 11, the lower die 2 comprises a main groove 21 and end grooves 22 located at the left and right ends of the main groove 21, a vertical joint 23 is provided between the main groove 21 and the end grooves 22, and groove protection frames 24 protruding upward are distributed on the front and rear sides of the main groove 21, the main cavity 11 comprises a first stepped cavity 111 adapted to the groove protection frame 24, and after the upper die 1 is locked and connected with the lower die 2, the first stepped cavity 111 covers the groove protection frame 24 and forms a molding chamber 3.

[0061] Specifically, Figure 1 As shown, when the composite scraper is operated in a harsh installation environment and complex extreme load conditions, the traction force at the joint between the flat chain groove 102 and the chain is the largest and is most susceptible to chain wear, thereby causing the vertical chain groove ( Figure 1 Not shown, please refer to Figure 8 The joints between the vertical chain groove 615 and the chain, and the joints between the lower part of the bolt hole 101 and the pressure plate, bolts, and nuts are also subject to greater wear. In the prior art, due to the unreasonable casting molding method during the processing of the composite scraper, the structural strength of the composite scraper itself is relatively low. The composite scraper is excessively lightweight by sacrificing the necessary structural strength of the composite scraper itself. It is this excessive exchange that leads to its unsatisfactory use effect.

[0062] Research and experiments have shown that the scraper's own weight can be reduced by 33% to 40% simply by fully wrapping the end body 200 through casting or compression molding. Moreover, when the end body 200 is fully wrapped with non-metallic materials such as wear-resistant resin, a moderate decrease in its various performances (excluding size) will not affect the use of the scraper, and there will be no phenomena such as "poor conveying operation, severe local wear, and even chain breakage in severe cases."

[0063] More specifically, when the composite scraper is molded by the molding die of the present invention, the core insert 300 used in the molding process will be specially designed to match the molding die, such as Figure 7-8As shown, it is a structural schematic diagram of a special core insert 6 in the present invention. When the special core insert 6 is designed, the main body 61 of the special core insert 6 can be reserved and designed with reference to the original structural dimensions of the main body 100 of the traditional low-alloy steel scraper. Therefore, when the composite scraper is molded, when the special core insert 6 is placed in the lower mold 2, the main body 61 of the special core insert 6 will fall into the main groove 21, and in the vertical direction, the vertical joint 23 provides a close fit and support in the vertical direction, and is surrounded by the groove protection frame 24 in the front and rear directions. After the upper mold 1 and the lower mold 2 are locked and connected, the end groove 22 and the main groove 21 will be completely separated by the vertical joint 23, the special core insert 6, and the groove protection frame 24. Under the joint support and enclosure, the end groove 22 and the main groove 21 will be completely separated. At this time, the part of the molding chamber 3 corresponding to the end groove 22, that is, the first molding cavity 31 formed by the end groove 22 and the end cavity 12 will also be divided into upper and lower parts by the wing body 62 of the special core insert 6, and the upper and lower parts are only connected at the tail end and fully wrap the wing body 62. When the composite scraper is processed and formed, only the first molding cavity 31 can be molded and formed with non-metallic materials, so that after the composite scraper is processed and formed, only the end body 200 is formed with a non-metallic material fully wrapped coating 400.

[0064] As can be seen from the above, through the above-mentioned setting of the compression molding die, the composite scraper only needs to fully wrap the wing body 62 of the special core insert 6 during processing and molding. After the composite scraper is molded, the structural strength of its body 100 will remain unchanged, thereby not only efficiently meeting the development requirements of lightweight coal machinery equipment, but also greatly improving the structural strength of the composite scraper itself, ensuring its use effect after long-term use, and thus improving the service life of the composite scraper. In addition, after the composite scraper is molded, since its body 100 retains the original structural size design of the low-alloy steel scraper, it can better adapt to the original matching assembly parts such as chains, pressure plates, bolts, etc., which helps to reduce the modification of related supporting equipment and the customized purchase of related special installation tools, and reduce production costs.

[0065] Preferably, the main cavity 11 further includes a second stepped cavity 112 arranged closely to the inner side of the first stepped cavity 111 , and the second stepped cavity 112 is communicated with the end cavity 12 .

[0066] Specifically, when the composite scraper is in operation, the upper part of the bolt hole 101 does not need to be in direct contact with the chain, that is, corresponding to the upper area of ​​the main body 100 of the composite scraper, the tensile strength and wear resistance of this area do not need to be designed to be very superior, and the coating layer 400 can be completely formed by compression molding of non-metallic composite materials, thereby achieving further weight reduction of the composite scraper.

[0067] More specifically, through the setting of the second stepped cavity 112, the dedicated core insert 6 can also 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 molded, when the dedicated core insert 6 is placed in the lower mold 2, the main body 61 of the dedicated core insert 6 will still fall into the main groove 21, and be provided with vertical upward close fit and support by the vertical joint 23 in the vertical direction, and be surrounded by the groove protection frame 24 in the front and rear direction; but at the same time, the reinforcing rib 612 will also be appropriately higher than the groove protection frame 24. Then, when the upper mold 1 and the lower mold 2 are locked and connected, the reinforcing rib 612 will extend upward into the second stepped cavity 112. At this time, the part of the molding chamber 3 corresponding to the weight-reducing groove 611, that is, the second molding cavity 32 will be enclosed between the second stepped cavity 112 and the weight-reducing groove 611, and the second molding cavity 32 will be connected with the first molding cavity 31. When the composite scraper is being compression molded, the second molding cavity 32 can also be compression molded with non-metallic materials to further reduce the weight of the composite scraper without affecting the overall structural strength of the composite scraper. At the same time, the structural setting of the second molding cavity 32 will greatly facilitate the injection of non-metallic materials such as wear-resistant resins, and flow and compaction toward the first molding cavity 31.

[0068] Preferably, the compression molding die further comprises a plurality of positioning plugs 4 , a threaded hole 41 is formed at the upper end of the positioning plug 4 , and / or a top plug hole 211 is formed through the main groove 21 downward.

[0069] Specifically, Figure 1 As shown, after the composite scraper is molded, its body 100 needs to be penetrated from top to bottom with a number of bolt holes 101, so as to facilitate the composite scraper and the chain to be assembled into a scraper chain after being pressed and assembled by a pressure plate, bolts, and nuts. When the molding die also includes a number of positioning plugs 4, when the composite scraper is molded, the special core insert 6 itself will also be provided with a first bolt hole 613 for the positioning plug 4 to pass through. The positioning plug 4 is used to pre-embed and position the special core insert 6, which can greatly improve the assembly accuracy and assembly efficiency of the special core insert 6 and the lower mold 2; at the same time, when the composite scraper is molded into the second molding cavity 32, the positioning plug 4 will be assembled with the first bolt hole 613 and will be basically flush with the reinforcing rib 612, which will greatly facilitate the one-time molding of the composite scraper after molding, and avoid the subsequent drilling of the composite scraper. The provision of the threaded hole 41 and / or the top plug hole 211 facilitates the removal of the positioning plug 4 after molding. After the positioning plug 4 is removed, the coating layer 400 molded by non-metallic material will form a second bolt hole above the first bolt hole 613. The second bolt hole and the first bolt hole 613 will together constitute the bolt hole 101 of the composite scraper.

[0070] Preferably, the main groove 21 is further provided with a top hole 212 penetrating downward.

[0071] Specifically, after the composite scraper is molded, the upper mold 1 is opened, and the coating layer 400 formed by injection molding of the non-metallic composite material will fill the lower mold 2. When the composite scraper is taken out of the lower mold 2, it will be difficult to demold because the overall mass of the composite scraper is still heavy. At this time, the opening of the ejector hole 212 will greatly facilitate the ejection of the composite scraper from the lower mold 2.

[0072] Preferably, the main groove 21 is provided with an upwardly protruding pressure plate seat 213, a flat chain seat 214, and a first vertical chain seat 215, a first escape space 216 is formed between the pressure plate seat 213 and the groove protection frame 24, and a second escape space 217 is enclosed between the flat chain seat 214 and the first vertical chain seat 215.

[0073] Specifically, after the composite scraper is formed, in order to facilitate the assembly into a scraper chain after being pressed and assembled with the chain through a pressure plate, bolts and nuts, a flat chain groove 102, a vertical chain groove 615 and a pressure plate groove 614 will be respectively opened at the lower part of the composite scraper body 100. The arrangement of the pressure plate seat 213, the flat chain seat 214, the first vertical chain seat 215, the first avoidance space 216 and the second avoidance space 217 can make the special core insert 6 be placed in the lower mold 2, and the main body 61 of the special core insert 6 will fall completely into the main groove 21. The main groove 21 will cover the lower part of the main body 61 and provide a vertical upward close fit and support for the main body 61, which is conducive to the stable and secure placement of the special core insert 6.

[0074] Preferably, the main slot 21 further includes at least one of the following configurations:

[0075] 1) The top plug hole 211 and the top piece hole 212 are both opened through the pressure plate seat 213;

[0076] 2) The vertical joint portion 23 is arranged close to the end surface of the pressure plate seat 213 and its height is equal to the height of the pressure plate seat 213, and the first avoidance space 216 passes through the vertical joint portion 23 and communicates with the end groove 22;

[0077] 3) The flat chain seat 214 and the first vertical chain seat 215 are both arranged close to the inner side wall of the groove protection frame 24 . The height of the first vertical chain seat 215 is equal to the height of the groove protection frame 24 and constitutes a reinforced groove frame 241 of the groove protection frame 24 .

[0078] Specifically, the pressure plate seat 213 is adapted to the pressure plate groove 614 of the dedicated core insert 6, and the top plug hole 211 must be opened through the pressure plate seat 213, and when the top piece hole 212 is also opened through the pressure plate seat 213, the upward force will be located in the center of the composite scraper, which is conducive to the stable lifting of the composite scraper. For the further arrangement of the vertical joint 23, the pressure plate seat 213, and the first avoidance space 216, after the composite scraper is formed, the pressure plate groove 614 will be set through along the length direction of its body 100, which is conducive to the tight fit between the composite scraper and the chain. The setting of the reinforcing groove frame 241 not only makes the reinforcing groove frame 241 more tightly enclose the special core insert 6 in the front-to-back direction, but also greatly facilitates the processing of the compression molding die. At this time, a second vertical chain seat 1121 can also be opened on the second step cavity 112. The second vertical chain seat 1121 cooperates with the first vertical chain seat 215 to complete the tight enclosure of the opposite chain groove 615, so that the special core insert 6 will not loosen in the front-to-back direction, thereby avoiding unqualified quality of the composite scraper after compression molding.

[0079] Preferably, the groove protection frame 24 includes a tail groove frame 242 located at the end of the length direction thereof, and the thickness of the tail groove frame 242 is gradually increased inwardly along the end of the length direction thereof.

[0080] Specifically, the end of the body 100 of the composite scraper along its length direction has avoided the position of the bolt hole 101. When the body 100 is moderately tapered inward in this area, it is helpful to moderately reduce the width of the end body 200, and will not affect the overall structural strength of the composite scraper, which is conducive to further weight reduction of the composite scraper. The setting of the tail slot frame 242 helps to achieve this weight reduction structure. More specifically, the body 61 of the special core insert 6 will also be tapered inward along its length direction. Then, the tail slot frame 242 needs to synchronously provide a tight enclosure for the special core insert 6 in the front-to-back direction to prevent the unnecessary expansion of the first molding cavity 31, or prevent the non-metallic material located in the first molding cavity 31 from flowing into other gap positions during the molding process to form an unnecessary coating layer.

[0081] Preferably, the second stepped cavity 112 is open upward, and the compression molding die further comprises an upper mold cover 5 , and the upper mold cover 5 is used to cover the second stepped cavity 112 after the upper mold 1 is buckled.

[0082] Specifically, during the molding process, the non-metallic material will produce a large amount of low-molecular volatile gases during the heating process. If these gases cannot be discharged from the molding chamber 3 in a timely and smooth manner, the volatile gases are very likely to be compressed and generate high temperatures during the molding process of the non-metallic material, thereby causing local carbonization and burning of the non-metallic material, or generating bubbles, or poor welding, which causes a decrease in density and affects the structural strength of the coating layer 400. In severe cases, it may even hinder the normal molding process. The open setting of the second stepped cavity 112 can realize an open exhaust during the molding process, and then use the upper mold cover 5 to compact the filled non-metallic material, and then perform a second mold closing pressure-maintaining cooling and shaping, which is beneficial to improving the molding quality of the composite scraper.

[0083] Preferably, an exhaust groove 13 is provided on the outer side of the upper mold 1 close to the end cavity 12 .

[0084] Specifically, during the compression molding process of the composite scraper, a large amount of low-molecular volatile gas will be generated in the first molding cavity 31 and urgently needs to be exhausted. The opening of the exhaust groove 13 will greatly facilitate the discharge of the gas in the first molding cavity 31, which is beneficial to improving the molding quality of the composite scraper; at the same time, when the upper mold 1 is opened, the opening of the exhaust groove 13 will also greatly facilitate the mold opening process under various extreme mold opening conditions.

[0085] Preferably, the molding chamber 3 at least includes a first molding cavity 31 distributed at both ends of the compression molding die, the first molding cavity 31 includes a vertical joint surface 311, a bottom end surface 312, a first inclined end surface 313, a tail arc surface 314, a second inclined end surface 315, and a third inclined end surface 316 which are sequentially connected head to tail, the vertical joint surface 311 is arranged close to the outer wall surface of the vertical joint part 23, and a first opening 318 is between the vertical joint surface 311 and the third inclined end surface 316, and the tail arc surface 314 and the first opening 318 are arranged on opposite sides.

[0086] Specifically, when the dedicated core insert 6 is placed in the compression molding die, it usually means that the compression molding die is in the compression molding process. At this time, the first opening 318 will be blocked by the main body 61 of the dedicated core insert 6, and the first molding cavity 31 will be divided into upper and lower parts by the wing body 62 of the dedicated core insert 6, and the upper and lower parts are connected only at the tail end and fully wrap the wing body 62, which also means that the first molding cavity 31 is completely activated under the action of the dedicated core insert 6. The above-mentioned multi-faceted design of the first molding cavity 31 is conducive to improving the bonding wrapping area and bonding wrapping strength between the coating layer 400 and the dedicated core insert 6 of the composite scraper after compression molding, thereby enhancing the overall structural strength of the composite scraper, and at the same time ensuring that the coating layer 400 at the end body 200 of the composite scraper can have sufficient thickness and length dimensions, so as to increase the thickness of the wear-resistant resin layer and ensure the wear resistance of the contact surface with the middle groove while reducing the weight to the maximum extent and adapting to the middle groove, and ensuring that the composite scraper has sufficient service strength.

[0087] Preferably, each joint surface of the molding cavity 3 is processed with a smooth arc.

[0088] When smooth arc treatment is further adopted between each joint surface, on the one hand, when the end body 200 of the composite scraper is in the process of compression molding, the interface bonding wrapping area of ​​the coating layer 400 can be further increased, thereby effectively ensuring the bonding strength with non-metallic materials such as wear-resistant resin; on the other hand, after the composite scraper is compression molded, the stress shearing effect of the special core insert 6 on the coating layer 400 can be effectively reduced, thereby reducing or delaying the probability or occurrence time of the interface bonding wrapping falling off after long-term use.

[0089] Preferably, the molding chamber 3 also includes a second molding cavity 32 located in the middle of the compression molding die and connected to the first molding cavity 31, the third inclined end surface 316 extends inward in a horizontal direction and connects to form an upper end surface 317, and the first opening 318 is opened between the upper end surface 317 and the vertical joint surface 311.

[0090] Specifically, in the compression molding die, when a special core insert 6 with a weight-reducing groove 611 is placed, the main body 61 of the special core insert 6 does not need to completely block the first opening 318, and a small gap can be left on the upper part of the first opening 318. At this time, the second molding cavity 32 will also be completely activated under the action of the special core insert 6, and connected with the first molding cavity 31 through the small gap, thereby achieving further weight reduction of the composite scraper without affecting the overall structural strength of the composite scraper, and at the same time, it will greatly facilitate the injection of non-metallic materials such as wear-resistant resins, and flow and compaction in the direction of the first molding cavity 31.

[0091] Example 2

[0092] The present invention also provides a composite scraper online compression molding process, using a composite scraper online compression molding die, which includes the following steps:

[0093] S1: Start the temperature-controlled compression molding machine, remove the upper mold 1, take an appropriate amount of blank and place it in the end cavity 12;

[0094] S2: The preheated special core insert 6 is moved and placed on the lower mold 2, and the positioning plug 4 is pre-embedded and positioned;

[0095] S3: Take an appropriate amount of blank again and place it in the weight-reducing groove 611 of the dedicated core insert 6;

[0096] S4: Move the upper mold 1 to the top of the lower mold 2, and start the temperature-controlled compression molding machine to move the slider downward to quickly close the mold;

[0097] S5: After the mold is closed once and the molding is finalized, the slider of the temperature-controlled compression molding machine is started to move upward to complete the open exhaust;

[0098] S6: Move the upper mold 1 to the top of the lower mold 2, start the temperature-controlled compression molding machine slider to move downward to complete the secondary mold closing;

[0099] S7: After the secondary mold closing and pressure-maintaining cooling and shaping, the slider of the temperature-controlled compression molding machine is started to move upward, the upper mold 1 is opened, and the positioning plug 4 and the molded composite scraper product are ejected in sequence;

[0100] S8: After trimming, the formed composite scraper products are inspected for product quality and packaged for storage;

[0101] S9: Execute steps S1-S8 in a loop.

[0102] Specifically, the composite scraper online compression molding die may include an upper mold cover 5 or may not include the upper mold cover 5. When the upper mold cover 5 is not included, the upper mold 1 is closed, that is, the second step cavity 112 is no longer open upward. At this time, the open exhaust can only be completed by starting the temperature-controlled compression molding machine slider to move upward.

[0103] As another preferred embodiment of the present invention, when the composite scraper online molding die further includes an upper die cover 5, the second stepped cavity 112 in the upper die 1 will be open upwardly, and at this time, the upper die cover 5 can also be in a non-fastening state with respect to the upper die 1 to complete the one-time mold closing and shaping in the open exhaust mode. At this time, steps S5-S7 can be modified as follows:

[0104] S5': the temperature-controlled compression molding machine performs one-step mold closing and molding in an open exhaust mode;

[0105] S6': Move the upper mold cover 5 to the top of the upper mold 1 for quick fastening to complete the secondary mold closing;

[0106] S7': After the secondary mold closing and pressure-maintaining cooling and shaping, the slider of the temperature-controlled compression molding machine is started to move upward, the upper mold cover 5 and the upper mold 1 are opened, and the positioning plug 4 and the molded composite scraper product are ejected in sequence.

[0107] Therefore, the present invention is equivalent to proposing another online compression molding process for composite scrapers on the basis of the above-mentioned process. Compared with the former, the latter can make the one-time molding of the composite scraper be an open exhaust mode. In this mode, the emission of low-molecular volatile gases is more timely, which is beneficial to improving the molding quality of the composite scraper.

[0108] Preferably, before step S1, the process further comprises the following steps:

[0109] ST1: Place the wear-resistant resin-based composite material into a hot air circulation system at 70℃~95℃ for preheating and drying;

[0110] ST2: Use cotton yarn dipped in acetone to clean the oil stains on the inner and outer surfaces of the upper mold 1 and the lower mold 2, and evenly apply the release agent;

[0111] ST3: Place the upper mold 1 and the lower mold 2 together and place them between the upper and lower mold plates of the temperature-controlled compression molding machine to preheat and keep the temperature to 50°C to 80°C;

[0112] ST4: Surface rust removal, oil cleaning, roughening, secondary surface cleaning, primary preheating and drying at 60°C to 100°C, application of interface treatment agent, and secondary preheating at 100°C to 150°C are performed on the special core insert 6;

[0113] ST5: Use a vacuum feeding system to transport the wear-resistant resin-based composite material in step ST1 to a storage bin, and start a melt-plasticizing extrusion system to prepare a lump or sheet composite material blank.

[0114] It should be noted here that the wear-resistant resin-based composite material in step ST1 may include a functional modified resin-based composite material and / or a fiber-reinforced resin-based composite material, thereby preparing the blank in steps S1 and S3. Wherein, the resin may be composed of any one or more of polyamide, ultra-high molecular weight polyethylene, polytetrafluoroethylene, high-density polyethylene, polyurethane, polyoxymethylene, and polyimide, or may be composed of any one or more of natural rubber, styrene-butadiene rubber, nitrile rubber, butadiene rubber, and chloroprene rubber; and the fiber type may be any one or more of glass fiber, carbon fiber, quartz fiber, basalt fiber, ultra-high molecular weight polyethylene fiber, aramid fiber, and polyester fiber; and the fiber type may be any one or more of chopped fiber, long fiber and continuous fiber, fiber mat, and fiber fabric.

[0115] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A composite scraper online molding die, characterized in that: The invention comprises an upper die (1) and a lower die (2), wherein the upper die (1) comprises a main cavity (11) and end cavities (12) connected to the left and right ends of the main cavity (11), the lower die (2) comprises a main groove (21) and end grooves (22) located at the left and right ends of the main groove (21), a vertical joint portion (23) is provided between the main groove (21) and the end groove (22), and groove protection frames (24) protruding upward are provided on the front and rear sides of the main groove (21), the main cavity (11) comprises a first stepped cavity (111) adapted to the groove protection frame (24), and after the upper die (1) and the lower die (2) are locked and connected, the first stepped cavity (111) covers the groove protection frame (24) to form a molding chamber (3); during the molding of the composite scraper online molding die, the following steps are included: S1: Start the temperature-controlled compression molding machine, remove the upper mold (1), take an appropriate amount of blank and place it in the end cavity (12); S2: The preheated special core insert (6) is moved and placed on the lower mold (2), and the positioning plug (4) is pre-embedded and positioned; S3: Take an appropriate amount of blank again and place it in the weight-reducing groove (611) of the dedicated core insert (6); S4: Move the upper mold (1) to the top of the lower mold (2), and start the temperature-controlled compression molding machine to move the slider downward to quickly close the mold; S5: After the mold is closed once and the molding is finalized, the slider of the temperature-controlled compression molding machine is started to move upward to complete the open exhaust; S6: Move the upper mold (1) to the top of the lower mold (2), start the temperature-controlled compression molding machine to move the slider downward to complete the secondary mold closing; S7: After the secondary mold closing and pressure-maintaining cooling and shaping, the slider of the temperature-controlled compression molding machine is started to move upward, the upper mold (1) is opened, and the positioning plug (4) and the molded composite scraper product are ejected in sequence; S8: After trimming, the formed composite scraper products are inspected for product quality and packaged for storage; S9: loop through steps S1-S8; The special core insert (6) comprises a main body (61) and a wing body (62). When the composite scraper is molded, the special core insert (6) is placed in the lower mold (2), and the main body (61) falls into the main groove (21). In the vertical direction, the vertical joint portion (23) provides a close fit and support for the main body (61), and the main body (61) is surrounded by the groove protection frame (24) in the front and rear directions. After the upper mold (1) and the lower mold (2) are locked and connected, the vertical joint portion (2 3), the dedicated core insert (6) and the groove protection frame (24) are jointly fitted, supported and enclosed, and the end groove (22) and the main groove (21) are separated; the end groove (22) and the end cavity (12) enclose a first molding cavity (31), and the wing body (62) divides the first molding cavity (31) into upper and lower parts, and the upper and lower parts are connected only at the rear end and form a full wrap around the wing body (62); the main cavity (11) also includes a cavity closely attached to the first stepped cavity ( A second stepped cavity (112) is arranged on the inner side of the second stepped cavity (112), and the second stepped cavity (112) is communicated with the end cavity (12); reinforcing ribs (612) are arranged on both sides of the weight-reducing groove (611), and the reinforcing ribs (612) extend upward into the second stepped cavity (112), and the second stepped cavity (112) and the weight-reducing groove (611) enclose a second molding cavity (32), and the second molding cavity (32) is communicated with the first molding cavity (31); the dedicated core insert (6) is provided with a first bolt hole (613), and after the positioning plug (4) is assembled with the first bolt hole (613), the upper end surface of the positioning plug (4) is flush with the upper end surface of the reinforcing rib (612), and after the positioning plug (4) is removed after molding, a second bolt hole can be formed above the first bolt hole (613), and the second bolt hole and the first bolt hole (613) together constitute the bolt hole (101) of the composite scraper.

2. The composite scraper online compression molding die according to claim 1, characterized in that: The compression molding die also includes a plurality of positioning plugs (4), the upper ends of the positioning plugs (4) are provided with threaded holes (41), and / or the main groove (21) is provided with a top plug hole (211) penetrating downwards.

3. The composite scraper online molding die according to claim 2, characterized in that: The main groove (21) is also provided with a top piece hole (212) penetrating downward.

4. The composite scraper online compression molding die according to claim 3, characterized in that: The main groove (21) is provided with an upwardly protruding pressure plate seat (213), a flat chain seat (214), and a first vertical chain seat (215); a first escape space (216) is formed between the pressure plate seat (213) and the groove protection frame (24); and a second escape space (217) is enclosed between the flat chain seat (214) and the first vertical chain seat (215).

5. The composite scraper online compression molding die according to claim 4, characterized in that: The main tank (21) further comprises at least one of the following configurations: 1) The top plug hole (211) and the top piece hole (212) are both penetrated and opened on the pressure plate seat (213); 2) the vertical joint (23) is arranged close to the end surface of the pressure plate seat (213) and its height is equal to the height of the pressure plate seat (213), and the first avoidance space (216) passes through the vertical joint (23) and is connected to the end groove (22); 3) The flat chain seat (214) and the first vertical chain seat (215) are both arranged closely to the inner side wall of the groove protection frame (24); the height of the first vertical chain seat (215) is equal to the height of the groove protection frame (24) and constitutes a reinforcing groove frame (241) of the groove protection frame (24).

6. A composite scraper online compression molding die according to any one of claims 1 to 5, characterized in that: The second stepped cavity (112) is open upward, and the compression molding die further comprises an upper die cover (5), wherein the upper die cover (5) is used to cover the second stepped cavity (112) after the upper die (1) is buckled.

7. A composite scraper online compression molding die according to any one of claims 1 to 5, characterized in that: The molding chamber (3) at least comprises a first molding cavity (31) distributed at both ends of the compression molding die, the first molding cavity (31) comprising a vertical joint surface (311), a bottom end surface (312), a first oblique end surface (313), a tail arc surface (314), a second oblique end surface (315), and a third oblique end surface (316) which are sequentially connected head to tail, the vertical joint surface (311) being arranged in close contact with the outer wall surface of the vertical joint portion (23), a first opening (318) being formed between the vertical joint surface (311) and the third oblique end surface (316), and the tail arc surface (314) and the first opening (318) being arranged on opposite sides.

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