Wet-type static pressure molding line pulp riser feeding device
By designing a feeding device that combines a hollow sleeve-shaped pulp riser with a buffer pad on a wet static pressure molding line, the problems of easy breakage and difficult cleaning of the pulp riser were solved, thereby improving casting quality and production efficiency and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU HENGLI HYDRAULIC
- Filing Date
- 2025-06-12
- Publication Date
- 2026-07-14
AI Technical Summary
Existing pulp risers are prone to breakage on wet static pressing lines, are difficult to clean loose sand, and have poor production adaptability, resulting in low casting quality and production efficiency. Furthermore, the scarcity and high cost of large-size insulating sand risers restrict the economical production of heavy castings.
A pulp riser feeding device for wet static pressure molding line is designed, which adopts a hollow sleeve-shaped pulp riser and a buffer pad. The buffer pad is made of elastic silicone pad, which buffers the rigid contact between the pulp riser and the riser mold body. Combined with the venting channel and pre-drilled blind hole structure, the feeding effect of the casting is ensured and the cleaning is convenient.
It effectively avoids pulp riser breakage, improves casting quality and yield, reduces production costs, and enhances molding efficiency and casting surface quality.
Smart Images
Figure CN224487609U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thermal insulation riser technology, and in particular to a pulp riser feeding device for wet static pressure molding line. Background Technology
[0002] With the increasing demands for casting quality in the foundry industry, riser feeding technology has become a key factor affecting the internal density and performance of castings. Traditional sand risers, due to their low feeding efficiency, have been gradually replaced by high-efficiency exothermic risers or insulating risers. Among them, exothermic risers, although highly efficient in feeding, are more expensive; therefore, insulating risers are more widely used in actual production.
[0003] Insulating risers include two types: insulating sand risers and insulating pulp risers. In the production of heavy castings, due to the large hot spots in the castings, large-sized risers are usually required to ensure feeding effectiveness. However, the size of insulating sand risers is limited by production processes and costs, resulting in the near absence of large-sized insulating sand risers on the market. In contrast, pulp risers are inexpensive and readily available, but they have a rough surface, low dimensional accuracy, and significant drawbacks when used on wet-mold static pressure molding lines.
[0004] First, insufficient strength leads to breakage: the pulp riser itself has low structural strength and is easily crushed during high-pressure molding. The broken riser material may enter the mold with the molding sand, causing inclusion defects in the casting and reducing the yield.
[0005] Second, loose sand is difficult to clean: Due to the molding pressure, the surface of the pulp riser is rough and does not bond tightly with the molding sand. Loose sand is easily generated after molding. If it is not cleaned thoroughly, it will lead to poor surface quality of the casting.
[0006] Third, poor production adaptability: The surface of the insulating sand riser is smooth and can be firmly installed in the molding sand by manual hammering. However, the pulp riser cannot be installed in the same way and can only be positioned by the molding sand at the molding machine, which increases the instability of the process and affects the quality of the casting.
[0007] like Figure 1 A specific example is shown: the pulp riser is placed directly on the riser mold, with a rigid contact between the two. After the sand is removed, when the molding machine's pressure plate compacts the molding sand, it applies a pressure of nearly 120 MPa from top to bottom. Due to stress concentration, the area where the pulp riser contacts the riser mold will fracture. Because the interior of the pulp riser is composed of interwoven fibrous material, the fractured pieces are still partially connected by fibers, making them difficult to completely remove.
[0008] During subsequent pouring, the high-temperature molten metal causes the residual fibers to carbonize or vaporize, resulting in the original adhered pulp riser fragments forming individual particles. These particles may be drawn into the casting under the action of the flowing molten metal, leading to product quality problems.
[0009] In summary, while insulating sand risers are commonly used in wet-mold static pressure molding lines, their scarcity and high cost in large sizes limit the economical production of heavy castings. Although pulp risers have a cost advantage, their adaptability to high-pressure molding environments is insufficient, severely impacting casting quality and production efficiency. Therefore, there is an urgent need for a riser that can balance cost-effectiveness with high-pressure molding to improve casting yield and reduce production costs. Utility Model Content
[0010] The main technical problem solved by this utility model is to provide a pulp riser feeding device for wet static pressure molding line, which can effectively solve the problem of riser breakage, improve the efficiency of molding sand processing, improve the quality problems caused by riser slag, improve the molding quality of castings, and save costs.
[0011] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a pulp riser feeding device for wet static pressing molding lines, comprising:
[0012] Riser mold;
[0013] The pulp riser is in the shape of a hollow sleeve and is fitted onto the riser mold body;
[0014] A radial fitting clearance is formed between the inner wall surface of the pulp riser and the outer surface of the riser mold.
[0015] A ring-shaped groove is formed on the riser mold body at the contact position with the pulp riser. The bottom of the pulp riser is located within the ring-shaped groove, forming a radial fitting gap between the riser and the ring-shaped groove.
[0016] A buffer pad is placed inside the annular groove. The buffer pad is compressed between the annular groove and the pulp riser to form a buffer structure, which is used to buffer the rigid contact between the riser mold and the pulp riser.
[0017] In a preferred embodiment of this utility model, the buffer pad is an elastic silicone pad, and the thickness of the elastic silicone pad is 5-10mm.
[0018] In a preferred embodiment of this invention, the width of the elastic silicone pad is 2.0-2.8 mm wider than the pulp riser wall.
[0019] In a preferred embodiment of this utility model, the width of the elastic silicone pad is 2.5 mm wider than the pulp riser wall.
[0020] In a preferred embodiment of this utility model, the radial fit clearance between the inner wall surface of the pulp riser and the outer surface of the riser mold is 2.5-3.6 mm.
[0021] In a preferred embodiment of this utility model, the radial fit clearance between the inner wall surface of the pulp riser and the outer surface of the riser mold is 3mm.
[0022] In a preferred embodiment of this utility model, the radial fitting gap between the pulp riser and the annular groove is 1.8-2.4 mm.
[0023] In a preferred embodiment of this utility model, the radial fit gap between the pulp riser and the annular groove is 2mm.
[0024] In a preferred embodiment of the present invention, the top of the riser mold body is provided with an exhaust channel, and the bottom sides of the riser mold body are symmetrically provided with mounting bosses, through which the riser mold body is connected to the mold plate.
[0025] In a preferred embodiment of the present invention, at least three pre-drilled blind holes are provided at the riser neck positions on both sides of the riser mold body.
[0026] The beneficial effects of this utility model are: the plastic deformation of the buffer pad buffers the rigid contact between the pulp riser and the riser mold, avoids the pulp riser from breaking, solves the problem of pulp riser crushing, improves the casting molding quality, and saves costs; it can ensure the fitting accuracy between the pulp riser and the riser mold, achieve better feeding effect, and facilitate the cleaning of loose sand after molding, thus improving molding efficiency. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:
[0028] Figure 1 This is a schematic diagram of the structure of the pulp riser directly placed on the riser mold body in the background technology;
[0029] Figure 2 This is a schematic diagram of a preferred embodiment of the pulp riser of this utility model;
[0030] Figure 3 This is a schematic diagram of a preferred embodiment of the riser mold body of this utility model;
[0031] Figure 4 This is a schematic diagram of a preferred embodiment of the pulp riser feeding device for wet static pressing molding line of this utility model;
[0032] The components in the attached diagram are labeled as follows:
[0033] 1. Riser mold body; 11. Venting channel; 12. Mounting boss; 13. Riser neck; 14. Pre-drilled blind hole; 2. Pulp riser; 21. Inner cavity; 3. Annular groove; 4. Buffer pad. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0036] This utility model relates to an embodiment of a pulp riser feeding device for wet static pressure molding line.
[0037] Please see Figures 2 to 4 The wet static pressure molding line pulp riser feeding device includes: riser mold body 1 and pulp riser 2. Riser mold body 1 serves as the basic support for the entire feeding device and provides a positioning and bearing platform for pulp riser 2.
[0038] In one exemplary embodiment, the pulp riser 2 is a hollow sleeve and is fitted onto the riser mold 1. A radial fitting gap is formed between the inner cavity 21 wall of the pulp riser 2 and the outer surface of the riser mold 1. The size of the radial fitting gap is 2.5-3.6 mm, preferably 3 mm.
[0039] The gap is designed to ensure that the pulp riser 2 can be smoothly fitted onto the riser mold 1 during the molding process, and to form a stable feeding channel between the pulp riser 2 and the riser mold 1 during the pouring process, so that the molten metal can flow smoothly into the casting and achieve effective feeding.
[0040] Based on the above structure, this utility model has an annular groove 3 at the contact position between the riser mold body 1 and the pulp riser 2. The bottom of the annular groove 3 is covered with a buffer pad 4, and the bottom of the pulp riser 2 is located in the annular groove 3.
[0041] The buffer pad 4 is compressed between the annular groove 3 and the pulp riser 2 to form a buffer structure, which is used to buffer the rigid contact between the riser mold 1 and the pulp riser 2. When the pulp riser 2 is subjected to pressure, the plastic deformation of the buffer pad 4 can buffer the rigid contact between the pulp riser 2 and the riser mold 1, thus preventing the pulp riser from breaking.
[0042] The bottom of the pulp riser 2 and the annular groove 3 form a radial fitting gap. This gap ensures that the pulp riser 2 can be stably installed in the annular groove 3, and also provides appropriate compression space for the buffer pad.
[0043] Furthermore, the radial fit gap between the pulp riser 2 and the annular groove 3 is 1.8-2.4 mm, preferably 2 mm. Because the pulp riser 2 is irregularly sized, this gap not only provides a reasonable compression deformation space for the buffer pad, ensuring the stability of the buffering effect, but also facilitates the cleaning of loose sand after molding, improving molding efficiency.
[0044] The buffer pad 4 is preferably an elastic silicone pad, which has good elasticity and flexibility. The thickness of the elastic silicone pad is 5-10mm, which can withstand the impact and vibration during the molding and pouring process and provide sufficient buffer space.
[0045] Furthermore, the width of the elastic silicone pad is 2.0-2.8 mm wider than the pulp riser wall, preferably 2.5 mm, which can ensure the buffering effect while avoiding the impact of excessive thickness or width of the buffer pad on the fitting accuracy and shrinkage compensation effect between the pulp riser and the riser mold.
[0046] To ensure the stability and precision of the casting, this invention makes corresponding improvements to the riser mold body:
[0047] First, an exhaust channel 11 is provided at the top of the riser mold body 1 to smoothly discharge the air in the cavity, ensuring the quality and pass rate of the casting.
[0048] Secondly, mounting bosses 12 are symmetrically arranged on both sides of the bottom of the riser mold body 1. The riser mold body 1 is connected to the mold plate through the mounting bosses 12, and the force is evenly distributed, ensuring the stability of the riser mold body 1 during the molding and casting process. This solves the problem of inconvenient connection and unstable fixation of the riser mold body caused by the placement of the buffer pad.
[0049] Furthermore, at least three pre-drilled blind holes 14 are provided at the riser neck 13 positions on both sides of the riser mold body 1. The pre-drilled blind holes 14 are then drilled through using a radial drill, and the riser can be quickly separated from the casting by striking it with a hammer. By setting the pre-drilled blind holes, the flow of molten metal can be guided to promote faster solidification of the molten metal at the riser neck, thereby achieving a better feeding effect.
[0050] The casting feeding process of the pulp riser feeding device for wet-type static pressing molding line of this utility model is as follows:
[0051] Styling stage:
[0052] The riser mold 1 is fixedly connected to the mold plate by the mounting boss 12, and the pulp riser 2 is fitted into the riser mold 1. The bottom of the pulp riser 2 is located in the annular groove 3.
[0053] Pouring stage:
[0054] Molten iron is poured into the cavity of the casting through the ingate, at which point the riser mold body 1 is empty;
[0055] After the casting cavity is filled, the molten iron flows through the riser neck 13 and then into the inner cavity 21 of the pulp riser 2. The gas in the molten iron is discharged through the venting channel 11 at the top of the riser mold body 1 to avoid porosity defects.
[0056] When molten iron impacts, the pulp riser 2 is subjected to pressure. The plastic deformation of the elastic silicone pad can buffer the rigid contact between the pulp riser 2 and the riser mold 1, thus preventing the pulp riser from breaking.
[0057] Cleanup phase:
[0058] The pre-drilled blind hole 14 is quickly drilled through using a radial drill, and then the riser is quickly separated from the casting by striking it with a hammer.
[0059] The beneficial effects of this utility model's pulp riser feeding device for wet static pressing molding lines are:
[0060] Grooves are cut into the riser mold along the shape of the pulp riser, and a buffer pad is placed inside. The plastic deformation of the buffer pad buffers the rigid contact between the pulp riser and the riser mold, preventing the pulp riser from breaking and solving the problem of crushing the pulp riser. This improves the casting quality and saves costs.
[0061] While ensuring buffering, it can guarantee the fitting accuracy between the pulp riser and the riser mold, achieve better shrinkage compensation effect, and facilitate the cleaning of loose sand after molding, thereby improving molding efficiency.
[0062] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A pulp riser feeding device for a wet static pressing molding line, characterized in that, include: Riser mold; The pulp riser is in the shape of a hollow sleeve and is fitted onto the riser mold body; A radial fitting clearance is formed between the inner wall surface of the pulp riser and the outer surface of the riser mold. A ring-shaped groove is formed on the riser mold body at the contact position with the pulp riser. The bottom of the pulp riser is located within the ring-shaped groove, forming a radial fitting gap between the riser and the ring-shaped groove. A buffer pad is placed inside the annular groove. The buffer pad is compressed between the annular groove and the pulp riser to form a buffer structure, which is used to buffer the rigid contact between the riser mold and the pulp riser.
2. The pulp riser feeding device for wet-type static pressing molding line according to claim 1, characterized in that, The buffer pad is an elastic silicone pad with a thickness of 5-10mm.
3. The pulp riser feeding device for wet-type static pressing molding line according to claim 2, characterized in that, The width of the elastic silicone pad is 2.0-2.8 mm wider than the pulp riser wall.
4. The pulp riser feeding device for wet-type static pressing molding line according to claim 3, characterized in that, The width of the elastic silicone pad is 2.5 mm wider than the pulp riser wall.
5. The pulp riser feeding device for wet-type static pressing molding line according to claim 1, characterized in that, The radial fit clearance between the inner wall of the pulp riser and the outer surface of the riser mold is 2.5-3.6 mm.
6. The pulp riser feeding device for wet-type static pressing molding line according to claim 5, characterized in that, The radial fit clearance between the inner wall of the pulp riser and the outer surface of the riser mold is 3 mm.
7. The pulp riser feeding device for wet-type static pressing molding line according to claim 1, characterized in that, The radial fit clearance between the pulp riser and the annular groove is 1.8-2.4 mm.
8. The pulp riser feeding device for wet-type static pressing molding line according to claim 7, characterized in that, The radial fit clearance between the pulp riser and the annular groove is 2 mm.
9. The pulp riser feeding device for wet-type static pressing molding line according to claim 1, characterized in that, The riser mold body is provided with an exhaust channel at the top, and mounting bosses are symmetrically arranged on both sides of the bottom of the riser mold body, through which the riser mold body is connected to the mold plate.
10. The pulp riser feeding device for wet-type static pressing molding line according to claim 1, characterized in that, At least three pre-drilled blind holes are provided on each side of the riser neck position of the riser mold body.