Sand blowing hardening device for sand strength test

Abstract

The utility model belongs to the sand testing technical field especially relates to a sand blowing hardening device for sand strength test, including the pot body and the pot cover that covers the pot body top, the pot cover top middle part is equipped with the safety valve air hole for connecting the hardening gas, the safety valve air hole side end is equipped with two groups of pressure relief valve, the pot body inside bottom is equipped with a plurality of groups of support column, install the circular board in the pot body, let positioning ring realize the accurate positioning of mould group again, ensure that the forming groove and the exhaust plug are coaxial alignment, provide the passage for the directional penetration of gas, when the hardening gas enters the pot body inside through the safety valve air hole, penetrate sand sample along the forming groove, then enter the lower exhaust cavity through the exhaust plug and through -hole, finally discharge from the exhaust hole of the pot body side end, form "intake - penetration - exhaust" directional airflow loop, ensure that the sand sample inside and outside harden evenly, avoid appearing "the false performance state of outside strong inside weak".

Description

Technical Field

[0001] This utility model relates to the field of molding sand testing technology, and in particular to a molding sand blowing hardening device for molding sand strength testing. Background Technology

[0002] Molding sand is a key medium for shaping the solidified form of molten metal in casting production. Its strength properties are directly related to the quality of castings and are the core indicator for evaluating whether the sand mold can withstand various forces during handling, mold assembly, and pouring. Air blowing hardening is a commonly used rapid hardening method in chemical molding.

[0003] However, most air-blowing hardening devices currently used in the industry for molding sand strength testing are general-purpose devices lacking specific design. In use, a standard sample mold is placed in a sealed space, and hardening gas is introduced into the space. Hardening is achieved by the gas penetrating into the sand mold. However, this method has unavoidable technical drawbacks: Firstly, the gas penetration path is obstructed by the pore structure of the sand mold, easily leading to a layering phenomenon of "rapid surface hardening and insufficient internal gas penetration." The internal molding sand is not fully hardened, resulting in low strength and a false performance state of "strong outside, weak inside." Secondly, the overall air blowing lacks directional guidance, and the gas easily stagnates on the sample surface, causing local overblowing, leading to the failure of the surface binder and a decrease in strength. Meanwhile, the interior is underblown due to insufficient gas, ultimately resulting in highly volatile test data that cannot accurately reflect the actual strength performance of the molding sand formulation. This seriously misleads the optimization of molding sand proportions and quality control in casting production. Therefore, we propose an air-blowing hardening device for molding sand strength testing to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a molding sand blowing hardening device for molding sand strength testing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a molding sand blowing hardening device for molding sand strength testing, comprising a pot body and a pot lid fitted to the top of the pot body. A safety valve vent for receiving hardening gas is installed in the middle of the top of the pot lid. Two sets of pressure relief valves are installed on the side of the safety valve vent. Multiple sets of supporting columns are installed at the bottom of the pot body. A circular plate is fixedly fixed at the top of the multiple sets of columns. Multiple sets of positioning rings are fixedly installed on the circular plate. Each set of positioning rings has two sets of through holes. Each through hole is fixedly embedded with an exhaust plug. A mold set is placed at the top of the circular plate. The mold set has forming grooves that correspond one-to-one with the multiple sets of positioning rings, and the forming grooves are coaxially aligned with the exhaust plugs. Two sets of exhaust holes are symmetrically opened on both sides below the side of the pot body. A pot handle is fixed to the side of the pot body and the pot lid.

[0006] As an improved technical solution, the edge of the circular plate is bonded and sealed to the inner wall of the pot using high-temperature resistant sealant, and the sealing area covers the entire circumference of the edge of the circular plate.

[0007] As an improved technical solution, the safety valve vent is detachably connected to an external air blowing device via a high-pressure hose, and a pressure regulating valve and a flow meter are connected in series on the hose.

[0008] As an improved technical solution, the multiple sets of columns are distributed in a ring at equal intervals along the axis of the pot body, and the installation positions of the columns avoid the through holes on the circular plate.

[0009] As an improved technical solution, the mold assembly is composed of multiple segmented modules, and the forming groove on the mold assembly is in the shape of an "8".

[0010] As an improved technical solution, the circular plate is 8-12mm away from the edge of the pot body, and the circular plate is made of heat-resistant solid wood board or epoxy resin board with a thickness of 8-10mm.

[0011] As an improved technical solution, the exhaust port is fitted with a removable dust plug.

[0012] After adopting the above technical solution, the beneficial effects of this utility model are: I. This utility model uses a circular plate installed inside the pot and a positioning ring to accurately position the mold assembly, ensuring that the forming groove and the vent plug are coaxially aligned. This provides a channel for directional gas penetration. When the hardening gas enters the pot through the safety valve vent, it penetrates the molding sand sample along the forming groove, then enters the lower venting chamber through the vent plug and through the through hole, and finally exits from the vent hole on the side of the pot. This forms a directional airflow loop of "intake-penetration-venting," ensuring uniform hardening of the molding sand sample inside and out, avoiding a false performance state of "strong outside and weak inside." Furthermore, the integrated pressure relief valve in the pot allows for real-time release of overpressure gas inside the pot, preventing damage to the device due to excessive pressure. This design balances operational safety and gas utilization, reducing testing costs. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention in a partially disassembled state; Figure 3 This is a schematic diagram of the structure of the circular plate of this utility model; Figure 4 This is a schematic diagram of the mold assembly of this utility model; Figure 5 This is a partial cross-sectional structural diagram of the present invention.

[0014] In the diagram: 1. Pot body; 2. Pot lid; 3. Safety valve vent; 4. Pressure relief valve; 5. Circular plate; 6. Column; 7. Through hole; 8. Vent plug; 9. Mold assembly; 10. Forming groove; 11. Positioning ring; 12. Vent hole; 13. Pot handle. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] This utility model provides a technical solution: such as Figures 1 to 5 As shown in this embodiment, a molding sand blowing hardening device for molding sand strength testing includes a pot body 1 and a pot lid 2 covering the top of the pot body 1. A safety valve vent 3 for introducing hardening gas is installed in the middle of the top of the pot lid 2. Two sets of pressure relief valves 4 are installed on the side of the safety valve vent 3. The device is characterized in that: multiple sets of supporting columns 6 are installed at the bottom inside the pot body 1. A circular plate 5 is fixedly fixed at the top of the multiple sets of columns 6. Multiple sets of positioning rings 11 are fixedly installed on the circular plate 5. Two sets of through holes 7 are opened in each set of positioning rings 11. An exhaust plug 8 is fixedly embedded in each of the through holes 7. A mold set 9 is placed at the top of the circular plate 5. A forming groove 10 corresponding to the multiple sets of positioning rings 11 is opened on the mold set 9. The forming groove 10 is coaxially aligned with the exhaust plug 8. Two sets of exhaust holes 12 are symmetrically opened on both sides below the side of the pot body 1. A pot handle 13 is fixed to the side of the pot body 1 and the pot lid 2.

[0017] Using the pot body 1 as a sealed hardening cavity, the column 6 provides stable support for the circular plate 5, creating an independent exhaust chamber below the circular plate 5. This allows the positioning ring 11 to accurately position the mold assembly 9, ensuring that the forming groove 10 and the exhaust plug 8 are coaxially aligned, providing a channel for directional gas penetration. When the hardening gas enters the pot body 1 through the safety valve vent 3, it penetrates the molding sand sample along the forming groove 10, then enters the lower exhaust chamber through the exhaust plug 8 and through the through hole 7, and finally exits from the exhaust hole 12 on the side of the pot body 1, forming a directional airflow circuit of "intake-penetration-exhaust". The pressure relief valve 4 can release the overpressure gas in the pot in real time to prevent damage to the device due to excessive gas pressure.

[0018] In other embodiments, the edge of the circular plate 5 is bonded and sealed to the inner wall of the pot body 1 with high-temperature resistant sealant, and the sealed area covers the entire circumference of the edge of the circular plate 5. The gap between the circular plate 5 and the inner wall of the pot body 1 is filled with high-temperature resistant sealant to form a full-circumference sealing structure, blocking the path of gas leakage from the gap, ensuring that the gas in the pot can concentrate and flow along the directional airflow loop, maintaining stable gas pressure in the pot, providing sufficient pressure support for gas to penetrate the molding sand sample in the molding groove 10, and the stable gas pressure in the pot avoids airflow pressure fluctuations, preventing local over-blowing or under-blowing of the sample, and further improving the uniformity of hardening.

[0019] In other embodiments, the safety valve vent 3 is detachably connected to an external air blowing device via a high-pressure hose, and a pressure regulating valve and a flow meter are connected in series on the hose; This design allows for a flexible connection between the high-pressure hose, the safety valve vent 3, and the external air blowing equipment, facilitating device movement and maintenance. The pressure regulating valve can precisely adjust the blowing pressure according to the type of molding sand, and the flow meter monitors the gas flow rate in real time, ensuring that the blowing parameters meet the hardening requirements of different molding sands and avoiding poor hardening results due to parameter malfunction.

[0020] In other embodiments, multiple sets of columns 6 are distributed in a ring at equal intervals along the axis of the pot body 1, and the installation positions of the columns 6 avoid the through holes 7 on the circular plate 5. This design allows the evenly spaced, ring-shaped columns 6 to provide uniform support for the circular plate 5, preventing the circular plate 5 from tilting or deforming due to uneven force. By avoiding the installation position of the through hole 7, it ensures that the gas can smoothly enter the exhaust chamber at the lower end of the pot body 1 after being discharged from the through hole 7, and then be discharged from the exhaust hole 12, thus ensuring the smoothness of the directional airflow circuit.

[0021] In other embodiments, the mold assembly 9 is composed of multiple segmented modules, and the molding groove 10 on the mold assembly 9 is in the shape of an "8". This design allows the segmented modular design to enable the mold assembly 9 to be quickly disassembled and assembled, facilitating the rapid handling of hardened samples and reducing sample breakage rate. The figure-eight forming groove 10 directly adapts to the standard sample requirements of the molding sand strength test. After the molding sand is filled and hardened, it can be directly formed into a standard sample without further processing.

[0022] In other embodiments, the circular plate 5 is 8-12mm away from the edge of the pot body 1, and the circular plate 5 is made of heat-resistant solid wood board or epoxy resin board with a thickness of 8-10mm. This design allows for an 8-12mm installation spacing to provide a buffer space for the gas inside the pot, preventing the hardening gas from directly impacting the sample surface after entering through the safety valve vent 3. This effectively prevents local overblowing of the sample surface, avoids the failure of the surface adhesive, and ensures that the hardening degree of the sample surface and interior is consistent. The heat-resistant plate ensures that the circular plate 5 does not deform or get damaged in the hardening gas environment and is suitable for different types of hardening gas environments.

[0023] In other embodiments, a removable dust plug is embedded in the vent 12; With this design, when not in use, the silicone dust plug is embedded in the vent hole 12 and sealed by interference fit, preventing dust and debris from entering the pot body 1 and contaminating the vent chamber or blocking the through hole 7. When in use, the dust plug can be quickly pulled out without affecting the gas discharge.

[0024] This utility model provides a molding sand blowing hardening device for molding sand strength testing, the specific working principle of which is as follows: I. Preliminary Preparation Stage 1. Device inspection: Confirm that the sealant between the circular plate 5 and the inner wall of the pot body 1 is not cracked, the exhaust plug 8 is not damaged, the dust plug of the exhaust hole 12 has been pulled out and the passage is unobstructed, check that the sealing ring of the pot lid 2 is intact, the pressure relief valve 4 can rebound normally, and the safety valve vent 3 is not blocked.

[0025] 2. Assembly and Positioning: Place the segmented mold assembly 9 inside the positioning ring 11 of the circular plate 5, ensuring that the molding groove 10 and the vent plug 8 are precisely aligned, and that the mold assembly 9 is flat and without tilt. Clean the inner wall of the molding groove 10. 3. Gas connection: Connect the safety valve air port 3 to the external air blowing equipment through the high-pressure hose, ensuring that the hose joint is well sealed.

[0026] II. Sample Filling and Sealing Stage After the molding sand to be tested is mixed and ground evenly according to the standard formula, it is slowly filled into the molding groove 10 of the mold group 9. During the filling process, it is gently tamped with a special tamping rod to ensure that the molding sand has a uniform density and no pores. After filling, the surface of the mold group 9 is scraped flat with a scraper to remove excess molding sand. Then, the pot lid 2 is covered and the lock is tightened. Check that there is no leakage in each sealing part to ensure that a sealed cavity is formed inside the pot body 1.

[0027] III. Directional Air-blowing Hardening Stage The external blowing device valve is opened, allowing the hardening gas to enter the pot body 1 through the high-pressure hose and safety valve vent 3. Because the circular plate 5 is sealed to the inner wall of the pot body 1, the gas cannot leak from the gaps and can only flow towards the molding groove 10 of the mold assembly 9, penetrating the interior of the molding sand sample along the molding groove 10. After penetrating the sample, the gas enters the exhaust chamber below the circular plate 5 through the exhaust plug 8 and through hole 7, and is then discharged through the exhaust hole 12 on the side of the pot body 1, forming a stable "intake-penetration-exhaust" directional airflow circuit.

[0028] During the blowing process, the gas flow rate is monitored in real time by a flow meter to ensure parameter stability. The blowing time is controlled according to the type of molding sand so that the molding sand sample can achieve uniform hardening of the entire thickness under the action of directional airflow.

[0029] IV. Sample Removal Stage After the blowing is completed, close the valve of the external blowing equipment, and then quickly release the residual gas in the pot through the pressure relief valve 4. After the gas pressure in the pot drops to normal pressure, open the pot lid 2, disassemble the segmented mold group 9, and gently tap the mold to take out the uniformly hardened "8" shaped standard sample for subsequent tensile, compressive and other strength tests.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A molding sand blowing hardening device for molding sand strength testing, comprising a pot body (1) and a pot lid (2) covering the top of the pot body (1), wherein a safety valve vent (3) for introducing hardening gas is installed in the middle of the top of the pot lid (2), and two sets of pressure relief valves (4) are installed on the side of the safety valve vent (3), characterized in that: The bottom of the pot body (1) is equipped with multiple sets of supporting columns (6). The top of the multiple sets of columns (6) is fixed with a circular plate (5). Multiple sets of positioning rings (11) are fixed on the circular plate (5). Each set of positioning rings (11) has two sets of through holes (7). Each set of through holes (7) is fixedly fitted with an exhaust plug (8). A mold set (9) is placed on the top of the circular plate (5). The mold set (9) has forming grooves (10) that correspond one-to-one with the multiple sets of positioning rings (11). The forming grooves (10) are coaxially aligned with the exhaust plugs (8). Two sets of exhaust holes (12) are symmetrically opened on both sides below the side of the pot body (1). The pot body (1) and the pot lid (2) are fixed with pot handles (13).

2. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The edge of the circular plate (5) is bonded and sealed to the inner wall of the pot body (1) with high-temperature resistant sealant, and the sealed area covers the entire circumference of the edge of the circular plate (5).

3. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The safety valve vent (3) is detachably connected to an external air blowing device via a high-pressure hose, and a pressure regulating valve and a flow meter are connected in series on the hose.

4. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The multiple sets of columns (6) are distributed in a ring at equal intervals along the axis of the pot body (1), and the installation position of the columns (6) avoids the through holes (7) on the circular plate (5).

5. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The mold assembly (9) is composed of multiple segmented modules, and the forming groove (10) on the mold assembly (9) is in the shape of an "8".

6. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The circular plate (5) is 8-12mm away from the edge of the pot body (1). The circular plate (5) is made of heat-resistant solid wood board or epoxy resin board with a thickness of 8-10mm.

7. The molding sand blowing hardening device for molding sand strength testing according to claim 1, characterized in that: The exhaust port (12) is fitted with a removable dust plug.

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