Forming die of anti-skid polyurethane wheel

Abstract

The utility model provides a forming die for an anti-skid polyurethane wheel. The forming die comprises a cavity guide ring, a cavity fixing plate and a bottom plate which are connected in sequence, the upper end face of the cavity fixing plate is connected with a base part of a core rod; the core rod is sleeved with a wheel core and a mold cover; the handle comprises a handle part and a threaded hole part matched with the threaded column at the upper end of the core rod; convex strips extending up and down are arranged on the outer side walls of the plurality of cavity inserts, and concave-convex patterns are arranged on the inner side walls; a guide groove matched with the convex strip is formed in the inner side wall of the cavity guide ring; the ejector pin supporting plate is provided with a plurality of ejector pins and connected with the upper ends of the springs. The lower ends of the springs are connected with the baseplate; an ejector pin penetrating hole corresponding to the ejector pin is formed in the cavity fixing plate, and the ejector pin penetrates through the ejector pin supporting wheel core and the cavity insert penetrating hole; the groove is directly manufactured on the surface of the polyurethane tire, the friction coefficient between the groove and the ground is higher than that between a polyurethane wheel with the surface subjected to machining and the ground, the machining procedure is omitted, the production cost is reduced, the production efficiency is higher, and the product consistency is better.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane wheel manufacturing technology, and in particular to a molding die for an anti-slip polyurethane wheel. Background Technology

[0002] Compared to solid rubber tires, polyurethane solid tires have higher load-bearing capacity and better wear resistance, thus they are widely used in automated guided vehicles (AGVs) operating under low-speed, heavy-duty conditions. When heavy-duty polyurethane tires travel on smooth surfaces, slippage can occur due to the low coefficient of friction between polyurethane and the road surface. Therefore, the surface of polyurethane tires is usually roughened using machining methods. While machining improves the coefficient of friction to some extent, slippage still sometimes occurs. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a molding die for an anti-slip polyurethane wheel, which aims to solve the technical problems of easy slippage of solid polyurethane wheels in the prior art.

[0004] This utility model provides a molding die for an anti-slip polyurethane wheel, including a cavity guide ring, a cavity fixing plate, and a base plate connected sequentially from top to bottom; the upper end face of the cavity fixing plate is connected to the base part of the core rod, and the core rod is used to fit the wheel core and the mold cover;

[0005] The handle includes a handle portion and a threaded hole portion that mates with the threaded post at the upper end of the core rod;

[0006] Several cavity inserts have raised strips extending vertically on the outer side wall and concave-convex patterns on the inner side wall.

[0007] The inner wall of the cavity guide ring has guide grooves that correspond one-to-one with the protrusions;

[0008] The ejector pin support plate, corresponding to the lower end of the cavity fixing plate, is provided with several ejector pins and connected to the upper ends of several springs;

[0009] The lower end of the spring is connected to the base plate;

[0010] The cavity fixing plate has ejector pin holes that correspond one-to-one with the ejector pins. The ejector pins pass through the ejector pin holes to support the wheel core and the cavity insert.

[0011] When the handle is pressed down, the wheel core moves down to contact the upper end face of the cavity fixing plate, and the cavity insert slides down along the guide groove to also contact the upper end face of the cavity fixing plate, thus forming the mold forming cavity.

[0012] Furthermore, the inner wall of the cavity guide ring is a frustum conical surface;

[0013] The outer wall of the cavity insert slopes inward from top to bottom.

[0014] Furthermore, the upper and lower thicknesses of the cavity guide ring and the cavity insert are the same.

[0015] Furthermore, the central hole of the mold cover is fitted onto the core rod, and the lower end face of the mold cover includes a cylindrical boss surrounding the central hole of the mold cover and an annular stepped surface surrounding the cylindrical boss.

[0016] When the wheel core is fitted, the upper end face of the wheel core contacts the annular stepped surface of the lower end face of the mold cover.

[0017] Furthermore, the lower end face of the cavity guide ring has several first connecting holes;

[0018] The side wall of the cavity fixing plate has several second connecting holes that correspond one-to-one with the first connecting holes;

[0019] The base plate has several third connecting holes that correspond one-to-one with the second connecting holes above and below;

[0020] The cavity guide ring, cavity fixing plate, and base plate are fixed together by connecting the first connecting hole, the second connecting hole, and the third connecting hole in series with the first screw.

[0021] Furthermore, the ejector pin support plate includes an upper ejector pin fixing plate and a lower ejector pin pad plate that are fixedly connected by a second screw;

[0022] The top of the ejector pin passes through the upper end face of the ejector pin fixing plate;

[0023] The bottom of the ejector pin contacts the upper surface of the ejector pin pad;

[0024] The upper end of the spring passes through the ejector pin pad and is fixedly connected to the lower end face of the ejector pin fixing plate.

[0025] Furthermore, a positioning post is provided on the lower end face of the base portion of the core rod;

[0026] The cavity fixing plate has a positioning hole in the center;

[0027] The positioning pins correspond to the positioning holes;

[0028] The upper end face of the cavity fixing plate is fixedly connected to the base of the core rod by a third screw.

[0029] Furthermore, the base plate is fixed to the heating table by a fourth screw.

[0030] Furthermore, several springs are arranged in a ring on the base plate.

[0031] Furthermore, the upper edge of the cavity fixing plate is provided with an annular limiting platform to position the cavity guide ring on the upper edge of the cavity fixing plate.

[0032] The beneficial technical effects of this utility model are as follows: by dividing the cavity insert that forms the mold cavity into blocks, and setting concave and convex patterns on the inner sidewall of each block, when pouring, it forms a molding cavity for polyurethane pouring and molding. After pouring and molding, the cavity insert is dispersed to facilitate the removal of the molding wheel with the concave and convex patterns on the surface. Grooves are directly made on the surface of the polyurethane tire, which has a higher coefficient of friction with the ground than polyurethane wheels with mechanically processed surfaces. Moreover, it eliminates the mechanical processing steps, reduces production costs, increases production efficiency, and improves product consistency. Attached Figure Description

[0033] Figure 1 This is an exploded view of the molding die for an anti-slip polyurethane wheel according to this utility model.

[0034] Figure 2 This is a cross-sectional schematic diagram of the ejector pin lifting the molding insert in the molding die of the anti-slip polyurethane wheel of this utility model;

[0035] Figure 3 This is a top view of a molding die for an anti-slip polyurethane wheel according to the present invention.

[0036] Figure 4 This is a cross-sectional schematic diagram of the mold for forming an anti-slip polyurethane wheel according to the present invention, showing the wheel core and locking mold cover.

[0037] in:

[0038] 1-Handle;

[0039] 2-Core rod; 21-Base section; 22-Threaded post; 23-Positioning post;

[0040] 3-Wheel core;

[0041] 4-Mold cover; 41-Cylindrical boss; 42-Annular stepped surface;

[0042] 5-Cavity guide ring; 51-Guide groove; 52-First connecting hole;

[0043] 6-Cavity insert; 61-Raised strip; 62-Embossing pattern;

[0044] 7-Cavity fixing plate; 71-Positioning hole; 72-Ejector pin through hole; 73-Second connecting hole; 74-Annular limiting platform;

[0045] 8-Ejector pin support plate; 81-Ejector pin fixing plate; 82-Ejector pin pad;

[0046] 9-Thimble;

[0047] 10-Spring;

[0048] 11-Base plate; 111-Third connecting hole;

[0049] 12 - First screw;

[0050] 13 - Second screw;

[0051] 14 - Third screw;

[0052] 15 - Fourth screw. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0056] See Figure 1-4 This utility model provides a molding die for an anti-slip polyurethane wheel, including a cavity guide ring (5), a cavity fixing plate (7) and a base plate (11) connected sequentially from top to bottom; the upper end face of the cavity fixing plate (7) is connected to the base part (21) of the core rod (2), and the core rod (2) is used to fit the wheel core (3) and the mold cover (4);

[0057] The handle (1) includes a handle portion and a threaded hole portion that mates with the threaded post (22) at the upper end of the core rod (2);

[0058] Several cavity inserts (6) have raised strips (61) extending vertically on the outer side wall and raised and recessed patterns (62) on the inner side wall;

[0059] The inner wall of the cavity guide ring (5) has guide grooves (51) that correspond one-to-one with the protrusions (61);

[0060] The ejector pin support plate (8) is provided with a number of ejector pins (9) corresponding to the lower end face of the cavity fixing plate (7), and is connected to the upper end of a number of springs (10).

[0061] The lower end of the spring (10) is connected to the base plate (11);

[0062] The cavity fixing plate (7) has ejector pin holes (72) that correspond one-to-one with the ejector pins (9). The ejector pins (9) pass through the ejector pin holes (72) to support the wheel core (3) and the cavity insert (6);

[0063] When the handle (1) moves downward, the wheel core (3) moves down to contact the upper end face of the cavity fixing plate (7), and the cavity insert (6) slides down along the guide groove (51) to also contact the upper end face of the cavity fixing plate (7), a mold forming cavity is formed.

[0064] The mold forming cavity is a cylindrical cavity.

[0065] The wheel core (3) is fitted onto the core rod (2), and the mold cover (4) is then fitted onto the core rod (2), that is, the wheel core (3) is below the mold cover (4).

[0066] In this way, when the handle (1) does not rotate and moves downward, the spring supports the ejector pin support plate (8) upward. The ejector pin (9) on the ejector pin support plate (8) passes through the ejector pin hole (72) on the cavity fixing plate (7) and protrudes from the upper end face of the cavity fixing plate (7), contacting the lower end face of the wheel core (3) and the lower end face of the cavity insert (6), supporting the wheel core (3) and the cavity insert (6), so that the wheel core (3) and the cavity insert (6) do not contact the upper end face of the cavity fixing plate (7). At this time, the cavity insert (6) is dispersed to facilitate the removal of the model.

[0067] As the handle (1) moves downward by rotating in the first direction, the downward movement of the handle (1) applies pressure to the mold cover (4) and the wheel core (3). The wheel core (3) transmits the pressure sequentially to the ejector pin (9), the ejector pin support plate (8), and then to the spring (10). The ejector pin support plate (8) moves downward, and the spring (10) is compressed. When the top of the ejector pin (9) is parallel to the upper end face of the cavity fixing plate (7), the lower end face of the wheel core (3) contacts the upper end face of the cavity fixing plate (7). At this time, the cavity insert (6) falls down along the guide groove due to gravity. The cavity insert (6) gathers together to form a mold forming cavity. Polyurethane is poured into the mold forming cavity. After solidification, a polyurethane wheel containing the wheel core (3) is formed. Because the inner wall of the cavity insert (6) is a concave-convex pattern, an uneven pattern is directly formed on the outer surface of the polyurethane wheel, that is, it has texture. Then, as the handle (1) moves upward by rotating in the second direction, the pressure generated by the handle (1) is gradually released. The ejector pin support plate (8) moves upward due to the spring force, and the ejector pin (9) also moves upward, passes through the cavity fixing plate (7) and protrudes on the upper end surface of the cavity fixing plate (7). The cavity insert (6) moves upward along the guide groove, and the cavity insert (6) disperses, making it easier to form a polyurethane wheel for removal.

[0068] The second direction is the opposite of the first direction; for example, if the first direction is clockwise, the second direction is counterclockwise.

[0069] By dividing the cavity inserts that form the mold cavity into blocks, each block has a raised and recessed pattern on its inner sidewall. When pouring, these blocks form a molding cavity for polyurethane pouring. After pouring, the cavity inserts are dispersed to facilitate the removal of the molding wheel with the raised and recessed pattern on its surface. Grooves are directly made on the surface of the polyurethane tire, resulting in a higher coefficient of friction with the ground than polyurethane wheels with machined surfaces. Furthermore, the machining process is eliminated, reducing production costs, increasing production efficiency, and improving product consistency.

[0070] Furthermore, the inner wall of the cavity guide ring (5) is a frustum conical surface;

[0071] The outer sidewall of the cavity insert (6) slopes inward from top to bottom.

[0072] Inclined inward from top to bottom, the upper opening of the cavity guide ring (5) is larger than the lower opening. At this time, the guide groove (51) on the cavity guide ring (5) also inclines inward from top to bottom.

[0073] When the cavity insert (6) slides down along the guide groove (51) and comes into contact with the upper end face of the cavity fixing plate (7), the outer side wall of all cavity inserts (6) also forms a frustum of a cone.

[0074] The outer wall of the cavity insert (6) slopes inward from top to bottom, facilitating the fitting of the protrusion into the guide groove (51). When the cavity insert (6) falls onto the cavity fixing plate (7) without ejector pin support, the cavity guide ring (5) slopes inward and has a smaller lower opening, causing each cavity insert (6) to be positioned within a smaller area, forming a molding cavity together, which facilitates the casting and molding of polyurethane. When the cavity insert (6) is supported upward by ejector pin (9), the cavity guide ring (5) has a larger upper opening than a lower opening, causing each cavity insert (6) to spread out, which is beneficial for removing the anti-slip polyurethane wheel with its textured surface.

[0075] Furthermore, the upper and lower thicknesses of the cavity guide ring (5) and the cavity insert (6) are the same.

[0076] Furthermore, the central hole of the mold cover (4) is fitted onto the core rod (2), and the lower end face of the mold cover (4) includes a cylindrical boss (41) surrounding the central hole of the mold cover (4) and an annular stepped surface (42) surrounding the cylindrical boss (41).

[0077] When the wheel core (3) is fitted, the upper end face of the wheel core (3) contacts the annular step surface (42) of the lower end face of the mold cover (4).

[0078] The lower end face of the mold cover (4) forms a cylindrical boss (41) and an annular stepped surface (42) surrounding the cylindrical boss (41), which further limits the wheel core to prevent the wheel core from shaking during casting and affecting the molding quality of the polyurethane wheel.

[0079] Furthermore, the lower end face of the cavity guide ring (5) has several first connecting holes (52);

[0080] The side wall of the cavity fixing plate (7) has several second connecting holes (73) that correspond one-to-one with the first connecting hole (52);

[0081] The base plate (11) has several third connecting holes (111) that correspond one-to-one with the second connecting holes (73);

[0082] The cavity guide ring (5), cavity fixing plate (7), and base plate (11) are fixedly connected together by connecting the first connecting hole (52), the second connecting hole (73), and the third connecting hole (111) with the first screw (12). The first connecting hole (52) in the cavity guide ring (5) has a threaded section, and the second connecting hole (73) in the cavity fixing plate (7) has a threaded section. The long first screw (12) is directly used to pass through the base plate (11), the cavity fixing plate (7), and partially penetrate the cavity guide ring (5) to make a threaded connection, so as to realize the connection of the three plates (cavity guide ring (5), cavity fixing plate (7), and base plate (11) together. This eliminates the number of threaded holes required for fixing only two adjacent plates among the three plates, reduces the number of screws, simplifies the assembly complexity, reduces the time spent on assembly, and facilitates disassembly.

[0083] Furthermore, the ejector pin support plate (8) includes an upper ejector pin fixing plate (81) and a lower ejector pin pad plate (82) fixedly connected by a second screw (13);

[0084] The top of the ejector pin (9) passes through the upper end face of the ejector pin fixing plate (81);

[0085] The bottom of the ejector pin (9) contacts the upper end face of the ejector pin pad (82);

[0086] The upper end of the spring (10) passes through the ejector pin pad (82) and is fixedly connected to the lower end face of the ejector pin fixing plate (81).

[0087] The ejector pin fixing plate (81) is used to install the ejector pin (9) in the form of a through hole. The bottom of the ejector pin (9) is supported by the ejector pin pad plate (82), which is mainly for the purpose of facilitating the installation of the ejector pin.

[0088] Furthermore, a positioning post (23) is provided on the lower end face of the base part (21) of the core rod (2);

[0089] The cavity fixing plate (7) has a positioning hole (71) in the center;

[0090] The positioning pin (23) corresponds to the positioning hole (71);

[0091] The upper end face of the cavity fixing plate (7) is fixedly connected to the base part (21) of the core rod (2) by the third screw (14).

[0092] When the upper end face of the cavity fixing plate (7) is fixedly connected to the base part (21) of the core rod (2) by the third screw (14), the positioning pin (23) and the positioning hole (71) can be used. The positioning pin (23) is inserted into the positioning hole (71) to play a positioning role, so that the third screw (14) can be aligned with the hole on the upper end face of the cavity fixing plate (7) and the hole on the base part (21) of the core rod (2) for connection.

[0093] Furthermore, the base plate (11) is fixed to the heating table by the fourth screw (15).

[0094] Furthermore, several springs (10) are arranged in a ring on the base plate (11). The ring arrangement of springs (10) helps to maintain balance and avoid tilting between ejector pins, tilting of the wheel core or cavity insert, which would affect the molding quality of the polyurethane wheel.

[0095] Furthermore, an annular limiting platform (74) is provided on the edge of the upper end face of the cavity fixing plate (7) to position the cavity guide ring (5) on the upper end face of the cavity fixing plate (7).

[0096] With the annular limiting platform (74), the cavity guide ring (5) is placed on the upper end face of the cavity fixing plate (7), which limits the horizontal movement of the cavity guide ring (5) and facilitates the alignment of each first connecting hole and each second connecting hole.

[0097] Specifically, there are three first connecting holes, which are arranged in an isosceles triangle on the lower end face of the cavity guide ring (5).

[0098] Specifically, there are 6 cavity inserts (6).

[0099] Furthermore, the cross-section of the convex strip (61) is T-shaped. The T-shaped head extends into the guide groove.

[0100] Furthermore, the ejector pins (9) are divided into a first type of ejector pin and a second type of ejector pin. The first type of ejector pins are arranged in a ring and contact the lower end face of the wheel core to support the wheel core. The second type of ejector pins support the cavity insert.

[0101] The molding principle of the polyurethane wheel of this invention is as follows:

[0102] First, the mold is fixed to the heating table of the production line by the fourth screw. Rotate the handle to remove the nut end of the handle (i.e., the part with the threaded hole) from the screw end (i.e., the threaded post) of the mandrel, remove the mold cover, insert the wheel core, fit the center hole of the wheel core onto the mandrel, and then cover the mold cover.

[0103] The second step involves attaching the handle and rotating it clockwise to press the mold cover downwards. The mold cover presses down on the wheel core, causing it to move downwards. The wheel core presses down on the ejector pins, which in turn move the ejector pin pad downwards, simultaneously compressing the spring. Since the ejector pin fixing plate and the ejector pin pad are connected, the ejector pin fixing plate and all the ejector pins move downwards simultaneously. The cavity insert moves downwards along the guide groove under the influence of gravity. When the lower surface of the wheel core contacts the upper surface of the cavity fixing plate, the upper end face of the ejector pin is also flush with the upper surface of the cavity fixing plate, and the lower surface of the cavity insert contacts the upper surface of the cavity fixing plate. At this point, the cavity inserts are assembled circumferentially to form a complete cylindrical cavity.

[0104] The third step is to pour polyurethane raw material into the molding cavity.

[0105] Fourth, after the polyurethane material has cured, rotate the handle counterclockwise to remove it from the mandrel. Under the action of the spring, the ejector plate, ejector fixing plate, and all ejector pins move upward simultaneously. The ejector pins push the wheel core and cavity insert upward simultaneously. Under the action of the guide groove, the cavity insert moves radially away from the axis of the wheel core during its upward movement. When the upper surface of the ejector fixing plate contacts the lower surface of the cavity fixing plate, the ribs of the grooves on the surface of the cavity insert and the molded product are completely removed from the polyurethane surface. Then, the resulting polyurethane wheel is removed from the mold.

[0106] The fifth step is to insert the wheel core, cover it with the mold cover, tighten the handle, and begin production of the next polyurethane wheel.

[0107] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A molding die for an anti-slip polyurethane wheel, characterized in that, It includes a cavity guide ring (5), a cavity fixing plate (7) and a base plate (11) connected from top to bottom; the upper end face of the cavity fixing plate (7) is connected to the base part (21) of the core rod (2), and the core rod (2) is used to fit the wheel core (3) and the mold cover (4); The handle (1) includes a handle portion and a threaded hole portion that mates with the threaded post (22) at the upper end of the core rod (2); Several cavity inserts (6) have raised strips (61) extending vertically on the outer side wall and raised and recessed patterns (62) on the inner side wall; The inner wall of the cavity guide ring (5) has guide grooves (51) that correspond one-to-one with the protrusions (61); The ejector pin support plate (8) is provided with a plurality of ejector pins (9) corresponding to the lower end face of the cavity fixing plate (7), and is connected to the upper end of a plurality of springs (10); The lower end of the spring (10) is connected to the base plate (11); The cavity fixing plate (7) has ejector pin holes (72) that correspond one-to-one with the ejector pins (9). The ejector pins (9) pass through the ejector pin holes (72) to support the wheel core (3) and the cavity insert (6). When the handle (1) is pressed down, the wheel core (3) moves down to contact the upper end face of the cavity fixing plate (7), and the cavity insert (6) slides down along the guide groove (51) to also contact the upper end face of the cavity fixing plate (7), a mold forming cavity is formed.

2. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The inner wall of the cavity guide ring (5) is a frustum conical surface; The outer wall of the cavity insert (6) slopes inward from top to bottom.

3. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The cavity guide ring (5) and the cavity insert (6) have the same thickness on the top and bottom.

4. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The central hole of the mold cover (4) is fitted onto the core rod (2). The lower end face of the mold cover (4) includes a cylindrical boss (41) surrounding the central hole of the mold cover (4) and an annular stepped surface (42) surrounding the cylindrical boss (41). When the wheel core (3) is fitted, the upper end face of the wheel core (3) contacts the annular step surface (42) of the lower end face of the mold cover (4).

5. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The lower end face of the cavity guide ring (5) has a plurality of first connecting holes (52); The side wall of the cavity fixing plate (7) has a plurality of second connecting holes (73) that correspond one-to-one with the first connecting hole (52); The base plate (11) has a plurality of third connecting holes (111) that correspond one-to-one with the second connecting hole (73); The cavity guide ring (5), the cavity fixing plate (7) and the base plate (11) are fixedly connected together by connecting the first connecting hole (52), the second connecting hole (73) and the third connecting hole (111) in series with the first screw (12).

6. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The ejector pin support plate (8) includes an upper ejector pin fixing plate (81) and a lower ejector pin pad plate (82) fixedly connected by a second screw (13); The top of the ejector pin (9) passes through the upper end face of the ejector pin fixing plate (81); The bottom of the ejector pin (9) contacts the upper end face of the ejector pin pad (82); The upper end of the spring (10) passes through the ejector pad (82) and is fixedly connected to the lower end face of the ejector fixing plate (81).

7. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The lower end face of the base part (21) of the core rod (2) is provided with a positioning post (23); The cavity fixing plate (7) is provided with a positioning hole (71) at its center; The positioning post (23) corresponds to the positioning hole (71); The upper end face of the cavity fixing plate (7) is fixedly connected to the base part (21) of the core rod (2) by a third screw (14).

8. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The base plate (11) is fixed to the heating table by the fourth screw (15).

9. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, Several of the springs (10) are arranged in a ring on the base plate (11).

10. The molding die for an anti-slip polyurethane wheel as described in claim 1, characterized in that, The upper edge of the cavity fixing plate (7) is provided with an annular limiting platform (74) to position the cavity guide ring (5) on the upper surface of the cavity fixing plate (7).

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