Polyurethane friction wheel pouring mold and using method thereof

Abstract

The invention discloses a polyurethane friction wheel pouring mold, and relates to the technical field of polyurethane wheels, the polyurethane friction wheel pouring mold comprises a bottom plate, a cavity, an isolation ring assembly, a mold cover and a mandrel, the cavity is arranged at the upper end of the bottom plate, the isolation ring assembly is arranged on the inner side of the cavity, the mold cover is arranged on the inner side of the isolation ring assembly, the mold cover is matched with a wheel core, and the mandrel is arranged on the bottom plate. The mandrel penetrates through the isolating ring assembly and is connected with the bottom plate. The high-hardness polyurethane layer provides good supporting performance, the radial deformation amount of the polyurethane wheel in the load state and internal heat generated in the operation process are remarkably reduced, and therefore the service life is prolonged. And a plurality of low-hardness polyurethane strips embedded in the surface provide a high friction coefficient, so that sufficient and stable driving force is ensured in the friction transmission process, and the phenomenon of transmission slipping is effectively avoided. In a load state, a plurality of low-hardness polyurethane strips embedded on the surface touch the ground at the same time. According to the composite structure, the performance advantages of polyurethane materials with different hardness are fully exerted, and the bearing capacity and the transmission performance are synergistically improved.

Description

Technical Field

[0001] This invention relates to the field of polyurethane wheel technology, and in particular to a polyurethane friction wheel casting mold and its method of use. Background Technology

[0002] Polyurethane friction wheels are widely used in conveying equipment and transmission systems, and their performance is significantly affected by the material hardness. High-hardness polyurethane has strong load-bearing capacity but a low coefficient of friction, while low-hardness polyurethane has a high coefficient of friction but is prone to deformation. To balance high load capacity and good friction performance, a composite polyurethane layer structure is required, that is, using polyurethane materials of different hardnesses simultaneously. Existing molds are difficult to achieve one-time casting composite molding; therefore, a special casting mold that can efficiently form composite polyurethane wheels is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a polyurethane friction wheel casting mold and its usage method to solve the above-mentioned technical problems.

[0004] The technical solution adopted in this invention is as follows: A polyurethane friction wheel casting mold includes a base plate, a cavity, an isolation ring assembly, a mold cover, and a mandrel. The cavity is provided at the upper end of the base plate, the isolation ring assembly is provided inside the cavity, the mold cover is provided inside the isolation ring assembly, the mold cover cooperates with the wheel core, and the mandrel passes through the isolation ring assembly and is connected to the base plate.

[0005] Preferably, the base plate also includes a positioning ring. The upper end of the base plate has an installation groove, and the positioning ring is disposed in the installation groove. The wheel core is sleeved on the outside of the positioning ring, and the positioning ring is connected to the base plate by a first bolt.

[0006] As a further preferred embodiment, the mold cover, the positioning ring, the mandrel, and the wheel core are coaxially arranged.

[0007] As a further preferred embodiment, the upper outer edge of the positioning ring is chamfered.

[0008] Preferably, the lower end of the mold cover has a slot, and the upper end of the wheel core is located inside the slot.

[0009] Preferably, the isolation ring assembly includes a fixing seat and a positioning sleeve. The fixing seat is provided on the inner side of the upper end of the positioning sleeve. The positioning sleeve and the fixing seat are connected by screws. A plurality of first grooves are provided on the inner wall of the positioning sleeve, and a plurality of second grooves are provided on the outer wall of the positioning sleeve. The first grooves and the second grooves are staggered.

[0010] As a further preferred embodiment, the fixing base is provided with a plurality of through holes, and the upper surface of the mold cover is provided with a first inclined surface, and the through holes are positioned directly opposite the first inclined surface.

[0011] As a further preferred embodiment, the upper end of the base plate is provided with a stepped groove, and the lower ends of the cavity and the positioning sleeve are both disposed within the stepped groove.

[0012] Preferably, the upper surface of the cavity is provided with a second inclined surface, which is inclined from top to bottom towards the center of the base plate.

[0013] A method of using a polyurethane friction wheel casting mold, comprising the polyurethane friction wheel casting mold, the method comprising the following steps: S1. First, install the positioning ring in the mounting groove and fix it, then install the wheel core so that the inner wall of the wheel core abuts against the outer wall of the positioning ring. S2. Then install the mold cover, with the upper end of the wheel core entering the lower end slot of the mold cover; S3. Then install the isolation ring assembly, insert the lower end of the positioning sleeve into the stepped groove, and position the isolation ring assembly by inserting the mandrel into the fixing seat. S4. Then, high-hardness liquid polyurethane material is poured through the through hole. The high-hardness liquid polyurethane material flows into the cavity between the positioning sleeve and the wheel core along the first inclined surface. At the same time, a certain amount of low-hardness liquid polyurethane material is poured through the second inclined surface of the upper surface of the cavity, so that the low-hardness liquid polyurethane material enters the cavity between the cavity and the positioning sleeve. Then, the isolation ring assembly is taken out upward. Under the action of gravity, the two polyurethane materials flow down the isolation ring assembly and fuse into one. S5. Then, place the entire mold in a 110°C oven for a certain period of time, then remove the product from the mold and continue to place the product in a 110°C oven for curing. After the product has been cured, remove the excess polyurethane part by mechanical processing.

[0014] The above technical solution has the following advantages or beneficial effects: (1) In this invention, the polyurethane layer adopts a composite structure, fusing low-hardness polyurethane strips and high-hardness polyurethane base layer, effectively solving the contradiction in the prior art where a single hardness polyurethane layer on the surface of the polyurethane wheel cannot simultaneously achieve high load capacity and high friction transmission performance. The high-hardness polyurethane layer provides good support, significantly reducing the radial deformation of the polyurethane wheel under load and the internal heat generated during operation, thereby extending its service life; while the multiple low-hardness polyurethane strips embedded on the surface provide a high coefficient of friction, ensuring sufficient and stable driving force during friction transmission and effectively avoiding transmission slippage. Under load, multiple low-hardness polyurethane strips embedded on the surface are simultaneously in contact with the ground. This composite structure fully utilizes the performance advantages of polyurethane materials with different hardness, achieving a synergistic improvement in load-bearing capacity and transmission performance.

[0015] (2) The casting mold and its usage method in this invention can realize the one-time casting of two polyurethane materials with different hardness. The process is simple and reliable, with high production efficiency, and has good practicality and economy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the polyurethane friction wheel casting mold in this invention; Figure 2 This is a top view of the polyurethane friction wheel casting mold in this invention; Figure 3 This is a cross-sectional schematic diagram of the cavity in this invention; Figure 4 This is a cross-sectional schematic diagram of the base plate in this invention; Figure 5 This is a cross-sectional schematic diagram of the mold cover in this invention; Figure 6 This is a cross-sectional schematic diagram of the isolation ring assembly in this invention; Figure 7 This is a top view of the isolation ring assembly in this invention; Figure 8 This is a schematic diagram of the polyurethane friction wheel in this invention; Figure 9 This is a schematic diagram of the polyurethane friction wheel casting mold during casting in this invention.

[0017] In the diagram: 1. Base plate; 2. Cavity; 3. Isolation ring assembly; 301. Fixing seat; 302. Positioning sleeve; 303. First groove; 304. Second groove; 305. Through hole; 306. Key; 4. Mold cover; 5. Mandrel; 501. Keyway; 6. Positioning ring; 7. Mounting groove; 8. Groove; 9. First inclined surface; 10. Stepped groove; 11. Second inclined surface; 12. Wheel core; 13. Inner polyurethane layer; 14. Low-hardness polyurethane strip. Detailed Implementation

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Please see Figures 1 to 8 The diagram illustrates a preferred embodiment of a polyurethane friction wheel casting mold, comprising a base plate 1, a cavity 2, an isolation ring assembly 3, a mold cover 4, and a mandrel 5. The cavity 2 is located at the upper end of the base plate 1, the isolation ring assembly 3 is located inside the cavity 2, and the mold cover 4 is located inside the isolation ring assembly 3. The mold cover 4 engages with the wheel core 12. The mandrel 5 passes through the isolation ring assembly 3 and connects to the base plate 1. In this embodiment, the base plate 1 serves as a basic support component. The cavity between the cavity 2 and the isolation ring assembly 3 accommodates low-hardness polyurethane raw material. The isolation ring assembly 3 acts as a barrier to prevent the flow of raw material within the mold. The cavity between the isolation ring assembly 3 and the wheel core 12 accommodates high-hardness liquid polyurethane raw material. In this embodiment, the isolation ring assembly 3 enables the separate casting and fusion of polyurethane raw materials with different hardnesses, thereby forming a composite polyurethane friction wheel. This allows the mold to be cast in one go to form a composite polyurethane wheel. This one-time casting method improves the bonding quality between polyurethane layers of different hardness, reduces defects such as delamination, and makes the overall performance of the polyurethane friction wheel more reliable, effectively improving product quality and production efficiency.

[0022] Furthermore, as a preferred embodiment, it also includes a positioning ring 6. A mounting groove 7 is provided at the upper end of the base plate 1, and the positioning ring 6 is disposed within the mounting groove 7. The wheel core 12 is fitted onto the outer side of the positioning ring 6, and the positioning ring 6 is connected to the base plate 1 by a first bolt. The positioning ring 6 serves to position the wheel core 12, ensuring its accurate position in the mold and guaranteeing the uniform distribution of polyurethane raw materials during subsequent casting. The first bolt facilitates the installation or removal of the positioning ring 6, allowing for the replacement of positioning rings 6 of different specifications to accommodate wheel cores 12 of different sizes.

[0023] Furthermore, as a preferred embodiment, the mold cover 4, positioning ring 6, mandrel 5 and wheel core 12 are coaxially arranged, which can reduce product quality problems caused by the positional deviation of wheel core 12.

[0024] Furthermore, as a preferred embodiment, the upper outer edge of the positioning ring 6 is chamfered. This facilitates the fitting of the wheel core 12 onto the periphery of the positioning ring 6.

[0025] Furthermore, as a preferred embodiment, the lower end of the mold cover 4 is provided with a groove 8, and the upper end of the wheel core 12 is located inside the groove 8, which facilitates the installation and positioning of the mold cover 4.

[0026] Furthermore, as a preferred embodiment, the isolation ring assembly 3 includes a fixing seat 301 and a positioning sleeve 302. The fixing seat 301 is provided on the inner side of the upper end of the positioning sleeve 302. A plurality of first grooves 303 are formed on the inner wall of the positioning sleeve 302, and a plurality of second grooves 304 are formed on the outer wall of the positioning sleeve 302. The first grooves 303 and the second grooves 304 are staggered. In this embodiment, during the casting process, the liquid polyurethane raw material with a high hardness formulation can enter the first groove 303, while the liquid polyurethane raw material with a low hardness formulation can enter the second groove 304. The polyurethane friction wheel finally formed includes, from the inside to the outside, a wheel core 12, an inner polyurethane layer 13, and an outer polyurethane layer. The outer wall of the inner polyurethane layer 13 forms a plurality of protrusions after the liquid polyurethane raw material with a high hardness formulation is cured in the first groove 303, and a low hardness outer polyurethane layer is formed between two adjacent protrusions. The outer polyurethane layer is arranged in several strips, including several low-hardness polyurethane strips 14. This effectively solves the contradiction in the prior art where the single hardness polyurethane on the surface of the polyurethane wheel is difficult to balance high load capacity and high friction transmission performance.

[0027] In this embodiment, the mandrel 5 is inserted into the fixing seat 301, and a keyway is provided on the side wall of the mandrel 5. The inner wall of the fixing seat 301 protrudes to form a key 306 that cooperates with the keyway 501. Through the cooperation of the keyway 501 and the key 306, relative rotation between the mandrel 5 and the fixing seat 301 can be avoided, thereby improving the stability of the structure.

[0028] Furthermore, as a preferred embodiment, the fixing base 301 has several through holes 305, and the upper surface of the mold cover 4 is provided with a first inclined surface 9, with the through holes 305 and the first inclined surface 9 facing each other. The high-hardness liquid polyurethane raw material enters the upper surface of the mold cover 4 through the through holes 305, and then is guided to flow through the first inclined surface 9 into the cavity between the positioning sleeve 302 and the wheel core 12. The upper surface of the cavity 2 is provided with a second inclined surface 11, which is inclined from top to bottom towards the middle of the base plate 1, so that the low-hardness liquid polyurethane raw material can flow into the cavity between the cavity 2 and the positioning sleeve 302, and after the isolation ring assembly 3 is removed, the two materials can better fuse under the action of gravity.

[0029] Furthermore, as a preferred embodiment, a stepped groove 10 is provided at the upper end of the base plate 1, and the lower ends of the cavity 2 and the positioning sleeve 302 are both disposed within the stepped groove 10. The stepped groove 10 facilitates the installation and positioning of the cavity 2 and the positioning sleeve 302, with the positioning sleeve 302 located inside the cavity 2.

[0030] A method for using a polyurethane friction wheel casting mold, comprising the polyurethane friction wheel casting mold, and the method comprising the following operating steps: S1. First, install the positioning ring 6 in the mounting groove 7 and fix it. Then install the wheel core 12 so that the inner wall of the wheel core 12 abuts against the outer wall of the positioning ring 6. S2. Then install the mold cover 4, with the upper end of the wheel core 12 entering the lower end slot 8 of the mold cover 4; S3. Then install the isolation ring assembly 3, insert the lower end of the positioning sleeve 302 into the stepped groove 10, and position the isolation ring assembly 3 by inserting the mandrel 5 into the fixing seat 301. S4. Then, high-hardness liquid polyurethane material is poured through the through hole 305. The high-hardness liquid polyurethane material flows along the first inclined surface 9 into the cavity between the positioning sleeve 302 and the wheel core 12. At the same time, a certain amount of low-hardness liquid polyurethane material is poured through the second inclined surface 11 on the upper surface of the cavity 2, so that the low-hardness liquid polyurethane material enters the cavity between the cavity 2 and the positioning sleeve 302. Then, the isolation ring assembly 3 is taken out upward. Under the action of gravity, the two polyurethane materials flow down the isolation ring assembly 3 and fuse into one. S5. Then, place the entire mold in a 110°C oven for a certain period of time, then remove the product from the mold and continue to place the product in a 110°C oven for curing. After the product has been cured, it can be machined to remove the excess polyurethane.

[0031] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A polyurethane friction wheel casting mold, characterized in that, The device includes a base plate, a cavity, an isolation ring assembly, a mold cover, and a mandrel. The cavity is located at the upper end of the base plate, the isolation ring assembly is located inside the cavity, and the mold cover is located inside the isolation ring assembly. The mold cover cooperates with the wheel core, and the mandrel passes through the isolation ring assembly and is connected to the base plate.

2. The polyurethane friction wheel casting mold as described in claim 1, characterized in that, It also includes a positioning ring. The upper end of the base plate has an installation groove, and the positioning ring is disposed in the installation groove. The wheel core is sleeved on the outside of the positioning ring, and the positioning ring is connected to the base plate by a first bolt.

3. The polyurethane friction wheel casting mold as described in claim 2, characterized in that, The mold cover, the positioning ring, the mandrel, and the wheel core are coaxially arranged.

4. The polyurethane friction wheel casting mold as described in claim 2, characterized in that, The upper outer edge of the positioning ring is chamfered.

5. The polyurethane friction wheel casting mold as described in claim 1, characterized in that, The lower end of the mold cover has a slot, and the upper end of the wheel core is located inside the slot.

6. The polyurethane friction wheel casting mold as described in claim 1, characterized in that, The isolation ring assembly includes a fixing seat and a positioning sleeve. The fixing seat is provided on the inner side of the upper end of the positioning sleeve. A plurality of first strip grooves are provided on the inner wall of the positioning sleeve, and a plurality of second strip grooves are provided on the outer wall of the positioning sleeve. The first strip grooves and the second strip grooves are arranged alternately.

7. The polyurethane friction wheel casting mold as described in claim 6, characterized in that, The fixing base has several through holes, and the upper surface of the mold cover has a first inclined surface, with the through holes facing the first inclined surface.

8. The polyurethane friction wheel casting mold as described in claim 6, characterized in that, The upper end of the base plate is provided with a stepped groove, and the lower end of the cavity and the positioning sleeve are both located in the stepped groove.

9. The polyurethane friction wheel casting mold as described in claim 1, characterized in that, The upper surface of the cavity is provided with a second inclined surface, which is inclined from top to bottom towards the middle of the base plate.

10. A method of using a polyurethane friction wheel casting mold, comprising the polyurethane friction wheel casting mold according to any one of claims 1-9, characterized in that, The method of use includes the following steps: S1. First, install the positioning ring in the mounting groove and fix it, then install the wheel core so that the inner wall of the wheel core abuts against the outer wall of the positioning ring. S2. Then install the mold cover, with the upper end of the wheel core entering the lower end slot of the mold cover; S3. Then install the isolation ring assembly, insert the lower end of the positioning sleeve into the stepped groove, and position the isolation ring assembly by inserting the mandrel into the fixing seat. S4. Then, high-hardness liquid polyurethane material is poured through the through hole. The high-hardness liquid polyurethane material flows into the cavity between the positioning sleeve and the wheel core along the first inclined surface. At the same time, a certain amount of low-hardness liquid polyurethane material is poured through the second inclined surface of the upper surface of the cavity, so that the low-hardness liquid polyurethane material enters the cavity between the cavity and the positioning sleeve. Then, the isolation ring assembly is taken out upward. Under the action of gravity, the two polyurethane materials flow down the isolation ring assembly and fuse into one. S5. Then, place the entire mold in a 110°C oven for a certain period of time, then remove the product from the mold and continue to place the product in a 110°C oven for curing. After the product has been cured, it can be machined to remove the excess polyurethane.

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