Polyurethane sieve plate forming mold

Abstract

The utility model discloses a polyurethane sieve plate forming mold, relates to the technical field of polyurethane sieve plate production equipment, and aims to solve the problems that an existing polyurethane sieve plate forming mold is inconvenient to demold a product, and the size of sieve pores of the demolded product is too large. Comprising an upper die base, a lower die base and an upper die core. A guide column is arranged on the lower die base, a guide hole is formed in the upper die base, a material injection hole is formed in the lower die base, and a material ejecting piece is connected to the lower die base in a sliding mode. The upper mold core is arranged on the upper mold base in a sliding connection mode, the two-stage demolding design mode is adopted, when a product is demolded, the upper mold core can be demolded firstly through first-stage demolding, a main body of the polyurethane sieve plate is limited between the upper mold base and the lower mold base, and it is guaranteed that the sizes of sieve holes in the polyurethane sieve plate are accurate; the upper mold core is connected to the upper mold base, the core column is arranged on the upper mold core, the upper mold hole is further formed in the upper mold base, and during secondary demolding, the upper mold core drives the upper mold base to move, so that demolding and taking-out of a product are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane sieve plate production equipment, in particular to a polyurethane sieve plate forming die. Background Art

[0002] Polyurethane sieve plate is a mesh product made of polyurethane. Because polyurethane sieve plate has good wear resistance and long service life, and its wear resistance is more than twice that of ordinary rubber sieve plate, polyurethane sieve plate is used in many types of screening machines to screen ore aggregates.

[0003] The existing polyurethane sieve plate production includes two categories. One is manual casting. Although this method is convenient for demoulding of the product, it has low production efficiency and is prone to bubbles. The other is mold casting. This method has significantly improved production efficiency, but the polyurethane sieve plate contains multiple groups of penetrating sieve holes, which is inconvenient to demould and often has the problem of large sieve hole size.

[0004] Therefore, the present application provides a polyurethane sieve plate forming mold to meet the needs. Utility Model Content

[0005] The purpose of the present application is to provide a polyurethane sieve plate forming mold, aiming to solve the problem that the existing polyurethane sieve plate forming mold is inconvenient for product demoulding and the sieve hole size of the product after demoulding is too large.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a polyurethane sieve plate forming mold, comprising an upper mold base, a lower mold base and an upper mold core, wherein the upper mold base and the lower mold base are respectively provided with a guiding and positioning boss and a groove for injection molding of a polyurethane sieve plate product on the facing surfaces thereof;

[0007] The facing surfaces of the lower mold base and the upper mold base are also provided with guide columns, the upper mold base is provided with guide holes adapted to the guide columns, the back surfaces of the lower mold base and the upper mold base are provided with injection holes connected to the groove, and the back surfaces of the lower mold base and the upper mold base are slidably connected with a ejecting piece for ejecting the polyurethane sieve plate product from the groove; by arranging a slidingly connected upper mold core on the upper mold base and adopting a two-stage demoulding design, when the product is demoulded, the upper mold core can be demoulded first through the first-stage demoulding, and the main body of the polyurethane sieve plate is also limited between the upper mold base and the lower mold base, so as to ensure the accuracy of the sieve hole size on the polyurethane sieve plate;

[0008] The upper mold core is slidably connected to the upper mold base, and a core column is provided on the facing surfaces of the upper mold core and the lower mold base. The upper mold base is also provided with an upper mold hole matching the size of the core column. During the secondary demolding, the upper mold base is moved by the upper mold core to separate the upper mold base from the lower mold base, which is convenient for demolding and removal of the product.

[0009] Preferably, the ejecting piece includes a ejecting plate and a ejecting rod, the ejecting rod is arranged on the facing surfaces of the ejecting plate and the lower mold base, the lower mold base is also provided with a ejecting hole matched with the ejecting rod, the ejecting hole is connected with the groove, and a reset spring is also provided between the ejecting plate and the lower mold base. By arranging the ejecting piece on the lower mold base and cooperating with the connecting plate on the lower mold base, after completing the secondary demolding, the lower mold base can be driven to move by the connecting plate, and cooperate with the ejecting column on the casting machine to resist the ejecting piece, and the polyurethane sieve plate can be ejected from the lower mold base by the ejecting rod to complete the production of the polyurethane sieve plate.

[0010] Preferably, the guide column is a T-shaped column including a head and a neck, the guide hole is a stepped hole including an outer hole and an inner hole, a clearance fit is adopted between the outer hole and the head, and an interference fit is adopted between the neck and the inner hole.

[0011] Preferably, side panels are further provided on the side surfaces of the upper mold core, and the side panels are provided in two groups and are symmetrically arranged on the upper mold core. Pull ears corresponding to the positions of the side panels are provided on the upper mold base.

[0012] Preferably, a connecting plate for driving the lower mold base to move is provided on the side surface of the lower mold base; and a connecting block for driving the upper mold core to move is provided on the upper mold core.

[0013] Preferably, the lower die base is also provided with a lower die hole matching the size of the core column.

[0014] In summary, the technical effects and advantages of the utility model are:

[0015] In the utility model, a slidingly connected upper mold core is arranged on the upper mold base, and a two-stage demolding design is adopted. When the product is demolded, the upper mold core can be demolded first through the first-stage demolding, and the main body of the polyurethane sieve plate is also limited between the upper mold base and the lower mold base to ensure the accuracy of the sieve hole size on the polyurethane sieve plate; during the second demolding, the upper mold base is driven to move by the upper mold core to separate the upper mold base from the lower mold base, which is convenient for demolding and removing the product.

[0016] In the utility model, a ejecting piece is arranged on the lower mold base, and cooperates with the connecting plate on the lower mold base. After the secondary demoulding is completed, the lower mold base can be driven to move by the connecting plate, and cooperates with the ejecting column on the casting machine to resist the ejecting piece, and the polyurethane sieve plate is ejected from the lower mold base by the ejecting rod to complete the production of the polyurethane sieve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 The explosion of the utility model Figure 1 ;

[0020] Figure 3 The explosion of the utility model Figure 2 ;

[0021] Figure 4 It is a half-section view of the utility model;

[0022] Figure 5 It is a partial cross-sectional view of the utility model;

[0023] Figure 6 It is a partial cross-sectional view of the lower die base of the utility model.

[0024] In the figure: 1, upper die base; 11, guide hole; 12, pull ear; 13, boss; 14, upper die hole;

[0025] 2. Lower die base; 21. Guide column; 22. Connecting plate; 23. Injection hole; 24. Ejection hole; 25. Lower die hole; 26. Groove;

[0026] 3. Upper mold core; 31. Side plate; 32. Connecting block; 33. Core column;

[0027] 4. Ejector piece; 41. Ejector rod; 42. Spring; 43. Ejector plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0029] refer to Figure 1-6A polyurethane sieve plate forming mold shown in the figure comprises an upper die base 1, a lower die base 2 and an upper die core 3, wherein the upper die base 1 and the lower die base 2 are respectively provided with a guiding and positioning boss 13 and a groove 26 for injection molding of a polyurethane sieve plate product on their facing surfaces, wherein the boss 13 is arranged on the upper die base 1 and is an integrally formed part with the upper die base 1, and the groove 26 is provided on the lower die base 2, and the depth dimension of the groove 26 is equal to the sum of the thickness dimension of the boss 13 and the thickness dimension of the product polyurethane sieve plate;

[0030] The upper mold core 3 is slidably connected to the upper mold base 1, and a core column 33 is provided on the facing surfaces of the upper mold core 3 and the lower mold base 2. The upper mold base 1 is also provided with an upper mold hole 14 whose size matches the core column 33. One end of the core column 33 is connected to the upper mold core 3, and the other end of the core column 33 protrudes from the upper mold base 1 and is located in the groove 26. When the upper mold core 3 moves, it can drive the core column 33 to slide in the upper mold hole 14; the lower mold base 2 is also provided with a lower mold hole 25 whose size matches the core column 33. When the upper mold base 1 and the lower mold base 2 are molded together, the end of the core column 33 is located in the lower mold hole 25, which can ensure the accuracy of the sieve holes on the polyurethane sieve plate and avoid the problem of the sieve holes being blocked during pouring.

[0031] The side surface of the upper mold core 3 is also provided with a side plate 31. The side plates 31 are provided in two groups and are symmetrically arranged on the upper mold core 3. The upper mold base 1 is provided with a pull ear 12 corresponding to the position of the side plate 31. The pull ear 12 is a C-shaped part. The side plate 31 cooperates with the pull ear 12 for demoulding. When the upper mold core 3 moves, the pull ear 12 can drive the upper mold base 1 to move, so that the upper mold base 1 and the lower mold base 2 can be separated and demoulded.

[0032] A guide column 21 is also provided on the facing surfaces of the lower mold base 2 and the upper mold base 1, and a guide hole 11 matched with the guide column 21 is opened on the upper mold base 1. The setting of the guide column 21 and the guide hole 11 is to enable the upper mold base 1 and the lower mold base 2 to be smoothly molded and demolded, while ensuring the casting accuracy of the polyurethane sieve plate. The guide column 21 is a T-shaped column, including a head and a neck, and the guide hole 11 is a stepped hole, including an outer hole and an inner hole. A clearance fit is adopted between the outer hole and the head, and an interference fit is adopted between the neck and the inner hole. The friction force between the neck and the inner hole is greater than the friction force between the core column 33 and the upper mold base 1. When demolding, the upper mold core 3 can be demolded first. A threaded section is opened on the neck of the guide column 21, and a threaded hole meshing with the guide column 21 is opened on the lower mold base 2. The guide column 21 and the lower mold base 2 are screwed.

[0033] The lower die seat 2 and the upper die seat 1 are provided with a material injection hole 23 connected with the groove 26 on their back surfaces, and a material ejecting member 4 for ejecting the polyurethane sieve plate product from the groove 26 is slidably connected on the lower die seat 2 and the upper die seat 1 on their back surfaces;

[0034] The ejection piece 4 includes an ejection plate 43 and an ejection rod 41, the ejection rod 41 is arranged on the facing surface of the ejection plate 43 and the lower mold base 2, the lower mold base 2 is also provided with an ejection hole 24 adapted to the ejection rod 41, the ejection hole 24 is connected with the groove 26, and a spring 42 for resetting is also provided between the ejection plate 43 and the lower mold base 2; the side of the lower mold base 2 is provided with a connecting plate 22 for driving the lower mold base 2 to move; the upper mold core 3 is provided with a connecting block 32 for driving the upper mold core 3 to move, the lower mold base 2 can be driven to move by the connecting block 32, and cooperate with the ejection column on the casting machine to resist the ejection piece 4, the lower mold base 2 drives the formed polyurethane sieve plate to move, the ejection piece 4 remains stationary, and the polyurethane sieve plate is ejected from the lower mold base 2 by the ejection rod 41 to complete the demolding.

[0035] Working principle of the utility model: during production, the upper die base 1 and the lower die base 2 are first molded together, and the mixed polyurethane raw material is injected into the groove 26 in the lower die base 2 through the injection hole 23 on the lower die base 2, and the pressure and temperature are maintained to form the polyurethane raw material into a sieve plate structure;

[0036] During demoulding, the upper mold core 3 is pulled by the connecting block 32 to move it away from the lower mold base 2 (due to the interference fit between the guide column 21 and the guide hole 11, the upper mold base 1 will not be driven to move when the upper mold core 3 moves), driving the core column 33 to slide out of the lower mold hole 25 on the lower mold base 2, and slide in the upper mold hole 14 on the upper mold base 1. When the end face of the core column 33 is flush with the end face of the boss 13, the core column 33 is completely separated from the polyurethane sieve plate. At the same time, the side plate 31 is against the pull ear 12, completing the first-level demoulding; continue to pull the connecting block 32 to move, drive the pull ear 12 to move through the side plate 31, thereby driving the upper mold base 1 to move and separate from the lower mold base 2, and starting the second-level demoulding. (Since the injection hole 23 is opened on the lower mold base 2, and the contact area between the product polyurethane sieve plate and the lower mold base 2 is larger than the contact area with the upper mold base 1, the product polyurethane sieve plate will remain on the lower mold base 2 when the upper mold base 1 is separated from the lower mold base 2). When the upper mold base 1 moves, under the cooperation and limitation of the guide column 21 and the guide hole 11, there will be no misalignment between the upper mold base 1 and the lower mold base 2; at the same time, the lower mold base 2 is driven by the connecting plate 22 to move away from the upper mold base 1, and cooperates with the top column on the casting machine. The top column resists the ejection plate 43, making it unable to move with the lower mold base 2, so that the ejection rod 41 pushes the polyurethane sieve plate to separate from the groove 26, thereby realizing the demolding of the polyurethane sieve plate.

[0037] The electromechanical connection involved in the present utility model is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of tests, which belongs to common knowledge.

[0038] Components not described in detail herein are prior art.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A polyurethane sieve plate forming mold, characterized in that: It comprises an upper mold base (1), a lower mold base (2) and an upper mold core (3), wherein the upper mold base (1) and the lower mold base (2) are respectively provided with a guiding and positioning boss (13) and a groove (26) for injection molding of a polyurethane sieve plate product on facing surfaces thereof; A guide column (21) is also provided on the facing surfaces of the lower die base (2) and the upper die base (1); a guide hole (11) adapted to the guide column (21) is provided on the upper die base (1); an injection hole (23) connected to the groove (26) is provided on the back surfaces of the lower die base (2) and the upper die base (1); and a ejector (4) for ejecting the polyurethane sieve plate product from the groove (26) is slidably connected on the back surfaces of the lower die base (2) and the upper die base (1); The upper die base (1) is slidably connected to the upper die core (3), a core column (33) is provided on the facing surfaces of the upper die core (3) and the lower die base (2), and the upper die base (1) is also provided with an upper die hole (14) whose size matches that of the core column (33).

2. A polyurethane sieve plate forming mold according to claim 1, characterized in that: The ejection member (4) comprises an ejection plate (43) and an ejection rod (41), wherein the ejection rod (41) is arranged on the facing surface of the ejection plate (43) and the lower die base (2), and the lower die base (2) is also provided with an ejection hole (24) adapted to the ejection rod (41), wherein the ejection hole (24) is communicated with the groove (26), and a spring (42) for returning is also provided between the ejection plate (43) and the lower die base (2).

3. A polyurethane sieve plate forming mold according to claim 1, characterized in that: The guide column (21) is a T-shaped column, comprising a head and a neck; the guide hole (11) is a stepped hole, comprising an outer hole and an inner hole; a clearance fit is adopted between the outer hole and the head, and an interference fit is adopted between the neck and the inner hole.

4. The polyurethane sieve plate forming mold according to claim 1, characterized in that: The side surface of the upper mold core (3) is also provided with a side plate (31), and the side plates (31) are provided in two groups and are symmetrically arranged on the upper mold core (3), and the upper mold base (1) is provided with a pull ear (12) corresponding to the position of the side plate (31).

5. A polyurethane sieve plate forming mold according to claim 4, characterized in that: A connecting plate (22) for driving the lower die base (2) to move is provided on the side surface of the lower die base (2); and a connecting block (32) for driving the upper die core (3) to move is provided on the upper die core (3).

6. The polyurethane sieve plate forming mold according to claim 1, characterized in that: The lower die base (2) is also provided with a lower die hole (25) having a size matching that of the core column (33).

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