Centrifugal forming die for polyurethane rubber sleeve of pulley sheet

Abstract

The utility model discloses a pulley wheel sheet polyurethane rubber sleeve centrifugal forming die, which relates to the technical field of rubber sleeve processing, and comprises an upper die, a middle ring and a lower die, the upper die is stacked above the lower die, the outer wall of the upper die and the outer wall of the lower die are respectively provided with an annular inner curved surface, and a slit is arranged between the two annular inner curved surfaces; the lower die and the upper die are sleeved with the middle ring, the inner wall of the middle ring is provided with an annular outer curved surface, and the annular outer curved surface and the two annular inner curved surfaces define a forming cavity; an annular storage cavity is defined by the upper die and the lower die and located on the inner side of the forming cavity, and the forming cavity communicates with the annular storage cavity through a slit. The centrifugal forming die for the polyurethane rubber sleeve of the pulley sheet is simple in structure, good in product forming effect and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber sleeve processing, in particular to a centrifugal forming die for a pulley wheel polyurethane rubber sleeve. Background Art

[0002] Polyurethane rubber sleeves are usually set on the pulleys of the electric wire release pulley to avoid direct friction between the wire and the pulley, reduce the wear of the cable wire when passing through the pulley, and protect the cable.

[0003] At present, polyurethane rubber sleeves are usually processed by injection molding. Since the polyurethane rubber sleeves on the electric wire-laying pulley wheels are large in size, bubbles are easily generated during the material flow and curing process during the injection molding process, thereby reducing the density and strength of the product and affecting the service life of the product. At the same time, the injection mold consists of an upper mold plate, a lower mold plate, a screw and an injection molding head, which require high dimensional accuracy and complex internal channels.

[0004] Therefore, it is necessary to propose a centrifugal forming die for the polyurethane rubber sleeve of a pulley wheel to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model aims to provide a pulley wheel polyurethane rubber sleeve centrifugal molding die with good molding effect and simple mold structure, so as to solve the problems raised in the above background technology.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the utility model is implemented by the following technical scheme: a pulley wheel polyurethane rubber sleeve centrifugal forming mold, comprising an upper mold, a middle ring and a lower mold, the upper mold is stacked above the lower mold, the outer walls of the upper mold and the lower mold are both provided with annular inner curved surfaces, and a slit is provided between the two sections of the annular inner curved surfaces;

[0009] The middle ring is sleeved on the outer sides of the lower mold and the upper mold, and the inner wall of the middle ring is provided with an annular outer curved surface, and the annular outer curved surface and two sections of annular inner curved surfaces together form a molding cavity;

[0010] The upper die and the lower die are combined to form an annular material storage cavity, the annular material storage cavity is located inside the forming cavity, and the forming cavity and the annular material storage cavity are connected through a slit.

[0011] Preferably, the upper die, the middle ring and the lower die are all ring-shaped.

[0012] Preferably, a cylindrical limiting portion is provided on the inner side of the lower mold, the upper mold is sleeved on the outer side of the cylindrical limiting portion, and an annular limiting portion is provided at a position of the upper mold corresponding to the cylindrical limiting portion.

[0013] Preferably, the middle ring is located between the upper die and the lower die, annular positioning parts are provided on both upper and lower sides of the annular outer curved surface, and positioning grooves matched with the annular positioning parts are provided on adjacent sides of the upper die and the lower die.

[0014] Preferably, an annular groove is opened on the top of the lower mold, and the annular groove is located on the lower outer side of the cylindrical limiting part. The upper mold is provided with an inclined surface at a position corresponding to the annular groove. The inclined surface, the annular groove and the outer wall of the cylindrical limiting part together form an annular storage cavity.

[0015] Preferably, the cross-section of the annular storage cavity is triangular, and the position of the slit corresponds to the end angle of the triangle.

[0016] Preferably, a first clamping portion is provided on the outer side of the middle ring, and a second clamping portion is provided on the outer sides of the upper die and the lower die.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a pulley wheel polyurethane rubber sleeve centrifugal forming mold, which has the following beneficial effects:

[0019] 1. The pulley wheel polyurethane rubber sleeve centrifugal molding mold is provided with an upper mold, a middle ring and a lower mold to enclose a molding cavity. After the material is cast in the cavity, centrifugal molding is performed. The centrifugal molding can effectively exhaust gas and improve the service life. At the same time, the mold structure is simple.

[0020] 2. The pulley wheel polyurethane rubber sleeve centrifugal molding mold increases the raw material reserves by arranging an annular storage cavity on the inner side of the molding cavity and connecting the annular storage cavity and the molding cavity through a slit, thereby avoiding product defects caused by insufficient raw materials. At the same time, the connection area between the edge material and the product is small, and the edge material is easy to remove after demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the assembly state of the structure of the utility model;

[0022] Figure 2 It is a cross-sectional schematic diagram of the assembly state of the structure of the utility model;

[0023] Figure 3 It is a cross-sectional schematic diagram of the structure of the utility model;

[0024] Figure 4 It is a schematic diagram of the injection state of the structure of the utility model.

[0025] In the figure: 1. upper die; 2. middle ring; 3. lower die; 4. positioning groove; 5. annular limiting portion; 6. inclined surface; 7. annular positioning portion; 8. first clamping portion; 9. annular outer curved surface; 10. cylindrical limiting portion; 11. annular groove; 12. annular inner curved surface; 13. second clamping portion; 14. storage trough; 15. molding cavity; 16. annular storage cavity; 17. slit. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] See also Figure 1-4 As shown, a centrifugal forming mold for a pulley wheel polyurethane rubber sleeve comprises an upper mold 1, a middle ring 2 and a lower mold 3. The upper mold 1 is stacked on the upper part of the lower mold 3. The outer walls of the upper mold 1 and the lower mold 3 are both provided with an annular inner curved surface 12. The two sections of the annular inner curved surface 12 are symmetrical, and a slit 17 is provided between the two sections of the annular inner curved surface 12; the middle ring 2 is sleeved on the outer sides of the lower mold 3 and the upper mold 1, and the inner wall of the middle ring 2 is provided with an annular outer curved surface 9. The annular outer curved surface 9 and the two sections of the annular inner curved surfaces 12 together form a forming cavity 15; the upper mold 1 and the lower mold 3 together form an annular storage cavity 16, which is located on the inner side of the forming cavity 15, and the forming cavity 15 is connected to the annular storage cavity 16 through a slit 17.

[0028] When in use, the middle ring 2 is mounted on the outer side of the upper mold 1 to form a material storage tank 14, the raw material melted by the casting machine is poured into the material storage tank 14, and then the upper mold 1 is covered, and after being assembled, it is pressed and fixed on the rotating platform of the centrifuge, and the axis of the mold is aligned with the axis of the rotating platform of the centrifuge. Under the action of centrifugal force, the liquid raw material fills the entire molding cavity 15. Centrifugal molding can effectively eliminate pores in the product, and the structure is more uniform.

[0029] By providing the annular storage cavity 16, the storage capacity of raw materials is increased under the action of the annular storage cavity 16, thereby avoiding product defects caused by insufficient raw materials. At the same time, the slit 17 is used to connect the molding cavity 15 and the annular storage cavity 16 to reduce the connection area between the edge material and the product, so as to facilitate the removal of the edge material after demolding.

[0030] The mold has a simple structure and good product molding effect.

[0031] Specifically, the upper die 1, the middle ring 2 and the lower die 3 are all annular. By adopting the annular upper die 1, the middle ring 2 and the lower die 3, the centrifuge can be ensured to run smoothly and vibration can be avoided to affect the molding effect.

[0032] In some embodiments, in order to facilitate the assembly and positioning of the upper mold 1 and the lower mold 3, a cylindrical limiting portion 10 is provided on the inner side of the lower mold 3, the upper mold 1 is mounted on the outer side of the cylindrical limiting portion 10, and an annular limiting portion 5 is provided at the position of the upper mold 1 corresponding to the cylindrical limiting portion 10.

[0033] By inserting the upper mold 1 onto the outer side of the cylindrical limiting portion 10, radial displacement between the upper mold 1 and the lower mold 3 is avoided. At the same time, an annular limiting portion 5 is provided on the inner side of the upper mold 1. The annular limiting portion 5 acts on the upper end surface of the cylindrical limiting portion 10 to control the assembly spacing between the upper mold 1 and the lower mold 3 so that a slit 17 is formed between the two sections of the annular inner curved surface 12.

[0034] In some embodiments, in order to facilitate the assembly and positioning of the middle ring 2, the middle ring 2 is located between the upper die 1 and the lower die 3, and an annular positioning portion 7 is provided on both the upper and lower sides of the annular outer curved surface 9, and a positioning groove 4 adapted to the annular positioning portion 7 is provided on the adjacent side of the upper die 1 and the lower die 3. By providing the annular positioning portion 7 at two sections of the annular outer curved surface 9, the annular positioning portion 7 falls into the positioning groove 4 after assembly, and the radial deviation of the middle ring 2 is avoided under the limit of the positioning groove 4. At the same time, under the limit support of the middle ring 2, the assembly spacing of the upper die 1 and the lower die 3 is controlled so that a slit 17 is formed between the two sections of the annular inner curved surface 12.

[0035] In some embodiments, the annular storage cavity 16 is formed by the following method: an annular groove 11 is opened on the top of the lower mold 3, and the annular groove 11 is located on the lower outer side of the cylindrical limiting portion 10. A slope 6 is provided at a position of the upper mold 1 corresponding to the annular groove 11. The slope 6, the annular groove 11 and the outer wall of the cylindrical limiting portion 10 together form the annular storage cavity 16.

[0036] Specifically, the cross section of the annular material storage chamber 16 is triangular, and the position of the slit 17 corresponds to the end angle of the triangle.

[0037] The annular material storage cavity 16 with a triangular cross section is formed in the above manner. During the centrifugal forming process, the raw materials in the annular material storage cavity 16 enter the forming cavity 15 through the slit 17 under the action of the triangular inclined surface.

[0038] In order to facilitate assembly and separation, a first clamping portion 8 is provided on the outer side of the middle ring 2, and a second clamping portion 13 is provided on the outer sides of the upper mold 1 and the lower mold 3. The first clamping portion 8 and the second clamping portion 13 are provided to clamp the upper mold 1, the middle ring 2 and the lower mold 3.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal forming mold for a pulley wheel polyurethane rubber sleeve, characterized in that: It comprises an upper die (1), a middle ring (2) and a lower die (3), wherein the upper die (1) is stacked on top of the lower die (3), the outer walls of the upper die (1) and the lower die (3) are both provided with an annular inner curved surface (12), and a slit (17) is provided between two sections of the annular inner curved surface (12); The middle ring (2) is sleeved on the outer sides of the lower mold (3) and the upper mold (1); the inner wall of the middle ring (2) is provided with an annular outer curved surface (9); the annular outer curved surface (9) and two sections of annular inner curved surfaces (12) together form a molding cavity (15); The upper die (1) and the lower die (3) together form an annular material storage cavity (16), the annular material storage cavity (16) is located inside the molding cavity (15), and the molding cavity (15) and the annular material storage cavity (16) are connected via a slit (17).

2. The centrifugal forming mold for the polyurethane rubber sleeve of a pulley according to claim 1, characterized in that: The upper die (1), the middle ring (2) and the lower die (3) are all ring-shaped.

3. The centrifugal forming mold for the polyurethane rubber sleeve of a pulley according to claim 1, characterized in that: A cylindrical limiting portion (10) is provided on the inner side of the lower die (3), the upper die (1) is sleeved on the outer side of the cylindrical limiting portion (10), and an annular limiting portion (5) is provided on the upper die (1) at a position corresponding to the cylindrical limiting portion (10).

4. The centrifugal forming mold for the polyurethane rubber sleeve of a pulley according to claim 1, characterized in that: The middle ring (2) is located between the upper die (1) and the lower die (3), annular positioning portions (7) are provided on both upper and lower sides of the annular outer curved surface (9), and a positioning groove (4) adapted to the annular positioning portion (7) is provided on one side adjacent to the upper die (1) and the lower die (3).

5. The pulley wheel polyurethane rubber sleeve centrifugal forming mold according to claim 1, characterized in that: An annular groove (11) is provided above the lower die (3), and the annular groove (11) is located below and outside the cylindrical limiting portion (10). An inclined surface (6) is provided at a position of the upper die (1) corresponding to the annular groove (11), and the inclined surface (6), the annular groove (11) and the outer wall of the cylindrical limiting portion (10) together form an annular material storage cavity (16).

6. The pulley wheel polyurethane rubber sleeve centrifugal forming mold according to claim 1, characterized in that: The cross section of the annular material storage chamber (16) is triangular, and the position of the slit (17) corresponds to the end angle of the triangle.

7. The pulley wheel polyurethane rubber sleeve centrifugal forming mold according to claim 1, characterized in that: A first clamping portion (8) is provided on the outer side of the middle ring (2), and a second clamping portion (13) is provided on the outer sides of both the upper die (1) and the lower die (3).

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