A guide wheel pouring device

Abstract

The utility model discloses a guide wheel pouring device, including the outer mould sleeve of transverse arrangement, the outer mould sleeve axial both sides all are provided with end template, the end template is set on the middle axle, and the middle axle one end is provided with the limit end, and the other end is provided with the lock nut, and the middle axle between two end templates still alternately is provided with the wheel hub and the isolation batten, the pouring hole is set up on the outer mould sleeve top surface. The utility model discloses simple structure can batch preparation same quality guide wheel, and the efficiency is high, and the operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane casting technology, specifically to a guide wheel casting device. Background Technology

[0002] Currently, guide wheels with polyurethane elastomer outer rings are widely used in industrial production, mainly in conveyor systems, transmission devices, and lifting equipment. These guide wheels combine the structural strength of metal hubs with the excellent properties of polyurethane materials, including high elasticity, wear resistance, oil resistance, and shock absorption characteristics.

[0003] Current production technology primarily employs annular cavity molds for casting. A typical manufacturing process involves placing a metal wheel hub as an insert in the center of the mold cavity, injecting liquid polyurethane material through a gating system, and completing the curing reaction under specific temperature and pressure conditions to form a bond between the polyurethane outer ring and the metal wheel hub. Regarding the mold structure, existing technology mainly uses the following configuration: a simple annular cavity composed of upper and lower molds, with the metal wheel hub fixed using simple locating pins or support blocks, and then polyurethane is poured using a single-point gate or side gate, with venting relying on the parting line gap or simple venting grooves. While this basic mold structure can accomplish the basic molding task, it has many limitations in ensuring product precision, consistency, and production efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a guide wheel casting device with simple structure, capable of mass-producing guide wheels of the same quality, high efficiency, and simple operation.

[0005] To solve the above-mentioned technical problems, this utility model provides a guide wheel casting device, including a transversely arranged outer mold sleeve, with end templates provided on both axial sides of the outer mold sleeve, the end templates being sleeved on a central shaft, one end of the central shaft being provided with a limiting end and the other end being provided with a locking nut, and a wheel hub and a separating pad being alternately arranged on the central shaft between the two end templates; a casting hole is opened on the top surface of the outer mold sleeve.

[0006] Furthermore, a placement bracket is provided below the outer mold sleeve, and a V-shaped placement groove is provided on the placement bracket.

[0007] Furthermore, a vibrator is installed inside the placement bracket.

[0008] Furthermore, an anti-rotation plate is also provided on the surface of the outer mold sleeve.

[0009] Furthermore, tapered guide surfaces are provided on both ends of the outer mold sleeve.

[0010] Furthermore, circular limiting protrusions are provided on the inner surface of the end template and on both sides of the isolation pad, and the diameter of the circular limiting protrusions is smaller than the diameter of the wheel hub.

[0011] Furthermore, it also includes a comb plate, which is disposed on the pouring gate, and the teeth of the comb plate extend between two adjacent isolation pads and between the end template and the adjacent isolation pad.

[0012] Furthermore, the top two ends of the comb plate are respectively provided with limiting overlapping protrusions, and the outer mold sleeve and / or end template corresponding to the limiting overlapping protrusions are provided with limiting recesses. The limiting overlapping protrusions and limiting recesses cooperate to restrict the movement of the comb plate.

[0013] The beneficial effects of this utility model are:

[0014] 1. A central shaft and an outer mold sleeve are used to form a central shaft reference system. The central shaft limits the position of the wheel hub, while the end templates and isolation pads are limited by the inner wall of the outer mold sleeve, achieving both isolation and alignment. Furthermore, the structure is easy to assemble, simply by nesting.

[0015] 2. The pouring port is located at the top, and the slurry flows from top to bottom, squeezing the internal gas upwards and expelling it. The large exhaust space makes it less prone to clogging, which can effectively reduce the generation of bubbles and improve the preparation quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is an exploded structural diagram of the mold part of this utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the mold part of this utility model;

[0019] Figure 4 This is a schematic diagram of the assembly structure of the wheel hub and the isolation pad of this utility model;

[0020] Figure 5 This is a schematic diagram of the overall structure of this utility model, which includes an anti-rotation plate and a comb plate.

[0021] Figure 6 This is a schematic diagram of the assembly structure of the comb plate of this utility model;

[0022] Figure 7 This is a schematic diagram of the end-positioning structure of one side of the comb plate of this utility model;

[0023] Figure 8 This is a schematic diagram of the isolation pad structure in one embodiment of the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0025] Reference Figures 1 to 4 As shown, one embodiment of the guide wheel casting device of this utility model includes a transversely arranged outer mold sleeve 1. End templates 2 are provided on both axial sides of the outer mold sleeve, and the end templates are fitted onto a central shaft 3. A limiting end 4 is provided at one end of the central shaft, and a locking nut 5 is provided at the other end. A hub 6 and an isolation pad 7 are alternately arranged on the central shaft between the two end templates. A casting hole 8 is provided on the top surface of the outer mold sleeve. The limiting end 4 cooperates with the locking nut to effectively axially compress and fix the isolation pad and end templates between them onto the central shaft. Furthermore, the interior of the outer mold sleeve is circular, conforming to the outer circular structure of the guide wheel structure. The circular inner wall structure, combined with the circular isolation pad, end templates, and central shaft, results in a clear centering effect, eliminating the need for centering adjustments.

[0026] Specifically, this application uses a central shaft and an outer mold sleeve to form a reference system. With the help of machining precision, it can ensure that the coaxiality error of all components is less than 0.02mm. Through the precise cooperation of the central shaft, end templates and isolation pads, the multi-degree-of-freedom constraint of the hub is achieved. In use, the first end template, hub, isolation pad, hub, isolation pad... hub, second end template are sequentially placed on the central shaft, and then locked and fixed with a lock nut to form an inner core structure. The inner core structure is then inserted into the outer mold sleeve to complete the assembly.

[0027] Of course, to improve the smoothness of assembly, the locking nut can be left unsecured initially. During the process of inserting the inner core structure into the outer mold sleeve, since there is no axial compression, the end template and isolation pad can adaptively fine-tune when entering the outer mold sleeve, avoiding problems such as jamming due to fixed positions. After they are in place, the locking nut can be tightened to secure them. Alternatively, the first end template can be assembled first, and then the end template and the central shaft can be pre-inserted into the outer mold sleeve to form a barrel-shaped structure with a central shaft. The barrel-shaped structure can be placed vertically, and the hub and isolation pad can be placed sequentially from top to bottom. Finally, the second end template can be placed and locked. In the above assembly process, since the central shaft and end template cannot directly guarantee that the central shaft is axially positioned in the outer mold sleeve, the isolation pad cannot smoothly enter the outer mold sleeve during the initial placement. Therefore, tapered guide surfaces 12 are provided on both ends of the outer mold sleeve. By applying a pushing force to the isolation pad, after the isolation pad comes into contact with the tapered guide surface, it will move along the tapered guide surface and thus smoothly enter the outer mold sleeve.

[0028] After assembly, the overall mold is placed horizontally with the pouring port facing upwards. Polyurethane slurry is injected into the mold through the pouring port using a pouring device. The polyurethane slurry flows and fills the cavities formed by the surface of the wheel hub, the side surface of the isolation pad, the inner surface of the end template, and the inner surface of the outer mold sleeve. By controlling the temperature, the polyurethane slurry is cured to obtain the guide wheel blank 111.

[0029] Loosen the locking nut, and then remove the guide wheel blank from the outer mold sleeve by tapping or lifting. The guide wheel blank is then machined to form its outer contour to obtain the finished product.

[0030] The release agent can be applied to the surfaces of the isolation pad, the end template, and the inner surface of the outer mold sleeve to ensure effective separation of the guide wheel blank without damaging the polyurethane surface. Circular limiting protrusions 13 are provided on the inner surface of the end template and both sides of the isolation pad. The diameter of the circular limiting protrusions is smaller than the wheel hub diameter. This circular limiting protrusion structure creates a gap between the isolation pad and the end template and the wheel hub, allowing the polyurethane slurry to flow to the side surface of the wheel hub, forming a coating effect and ensuring the bonding strength of the product.

[0031] Because the outer mold sleeve has a cylindrical outer surface and is placed horizontally, a placement bracket 9 is provided below the outer mold sleeve to prevent it from rolling during use. The placement bracket has a V-shaped placement groove 10 to effectively support the outer mold sleeve. During the polyurethane grout injection process, a vibrator is installed inside the placement bracket to better expel air. The vibrator's operation facilitates the expulsion of internal air, ensuring that the product is free of air bubbles and improving the quality of the finished product.

[0032] During the operation of the vibrator, there may be a problem of movement of the outer mold sleeve. Therefore, an anti-rotation plate 11 can be installed on the surface of the outer mold sleeve, as shown in the figure. Figure 5 As shown, the anti-rotation plate can be stepped on, which is convenient and reliable, or it can be locked to the top of the placement bracket with screws, which improves the ease of operation.

[0033] In one embodiment, Figures 5 to 7 As shown, during the injection process, polyurethane slurry enters the mold cavity simultaneously from both sides of the sprue. Therefore, a toothed comb plate 14 is designed. The comb plate is inserted into the sprue, and the teeth 15 of the comb plate extend between two adjacent isolation plates and between the end plate and the adjacent isolation plate to effectively block the flow of polyurethane. Polyurethane is injected from one side of the comb plate, while the other side is used for venting. When the mold is almost full, the comb plate is removed, and injection continues until the mold is full. The comb plate plays an auxiliary venting role, has a simple structure, and effectively improves the casting quality.

[0034] In order to position the comb plate during the casting process, limiting overlap protrusions 16 are provided at both ends of the top of the comb plate. Limiting recesses 17 are provided on the outer mold sleeve and / or end template corresponding to the limiting overlap protrusions. The limiting overlap protrusions and limiting recesses cooperate to restrict the movement of the comb plate. The comb plate can only move by inserting the plate.

[0035] In one embodiment, reference is made to Figure 8 As shown, since the center of the wheel hub surface typically has a hollowed-out weight-reducing section, polyurethane grout can enter gaps if the wheel hub and the adjacent circular limiting protrusion surface do not fit properly. Therefore, the circular limiting protrusion is designed as a ring structure, with a rubber pad 112 placed in the center of the ring structure. During assembly, the rubber pad first contacts and is compressed against the wheel hub surface, and then the circular limiting protrusion makes hard contact with the wheel hub, thus ensuring that there are no gaps after the two are fitted together. The rubber pad protrudes to a height of approximately 1mm.

[0036] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A runner gating device, characterized by, The outer mold sleeve is arranged laterally. End templates are provided on both sides of the outer mold sleeve. The end templates are sleeved on the central shaft. One end of the central shaft is provided with a limiting end and the other end is provided with a locking nut. Hubs and isolation pads are alternately provided on the central shaft between the two end templates. A pouring hole is opened on the top surface of the outer mold sleeve.

2. A trolley laiden apparatus as claimed in claim 1, characterised in that, A placement bracket is provided below the outer mold sleeve, and a V-shaped placement groove is provided on the placement bracket.

3. A trolley laiden apparatus as claimed in claim 2, wherein The placement bracket is equipped with a vibrator.

4. The trolley laiden apparatus of claim 2 wherein, An anti-rotation plate is also provided on the surface of the outer mold sleeve.

5. The trolley laiden apparatus of claim 1 wherein, Both ends of the outer mold sleeve are provided with tapered guide surfaces.

6. The trolley laiden apparatus of claim 1 wherein, A circular limiting protrusion is provided on the inner surface of the end template and on both sides of the isolation pad. The diameter of the circular limiting protrusion is smaller than the diameter of the wheel hub.

7. The trolley laiden apparatus of claim 1 wherein, It also includes a comb plate, which is disposed on the pouring gate, and the teeth of the comb plate extend between two adjacent isolation pads and between the end template and the adjacent isolation pad.

8. A trolley laiden apparatus as claimed in claim 7, characterised in that, The top two ends of the comb plate are respectively provided with limiting overlapping protrusions, and the outer mold sleeve and / or end template corresponding to the limiting overlapping protrusions are provided with limiting recesses. The limiting overlapping protrusions and limiting recesses cooperate to restrict the movement of the comb plate.

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