Resin curing agent conveying device with mixing function
By designing a spiral blade conveying device in the sand mixer and combining it with compressed air mixing, the problem of premature reaction between resin and curing agent was solved, and uniform mixing and strength improvement of the molding sand were achieved.
Patent Information
- Application Number
- CN202422018277.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-08-20
AI Technical Summary
When the existing sand mixer mixes the resin and the curing agent, the resin and the curing agent tend to react prematurely, resulting in reduced strength of the molding sand and failure to fully wrap the sand particles.
A resin curing agent delivery device was designed, which transported sand particles through spiral blades and added curing agent and resin at intervals during the delivery process. Compressed air was used for mixing to prevent premature hardening and ensure uniform mixing.
It improves the mixing quality and strength of the molding sand, prevents the molding sand from solidifying prematurely, ensures that the sand particles are evenly packed, and improves the performance of the molding sand.
Smart Images
Figure CN223352866U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting auxiliary equipment, in particular to a resin curing agent conveying device with a mixing function. Background Art
[0002] Sand casting is a casting method that produces castings in sand molds. Most non-ferrous alloy castings, such as steel and iron, can be formed using sand casting. Sand casting offers advantages such as high surface quality, high dimensional accuracy, low scrap rates, and a wide range of applications. Therefore, sand casting is widely used. The first step in sand casting is to mix qualified molding sand that meets casting requirements. The sand is then mixed with a liquid curing agent and resin, ensuring that the curing agent and resin are evenly distributed and effectively coated on the surface of the sand, forming a coated sand suitable for mold making. The sand is then formed into a casting mold for use.
[0003] A sand mixer is a device that evenly mixes the various components of molding sand. It is a device that can mix sand, resin, curing agent, etc. in a certain ratio to form molding sand suitable for casting. However, there are two main mixing methods for existing sand mixers. One is to put sand, curing agent, and resin into the sand mixer together for mixing. Since the resin and curing agent quickly complete the curing reaction within a short time after mixing, it is easy to cause some of the curing agent and resin to react and cure prematurely before contacting the sand. As a result, the three cannot be fully mixed and the sand cannot be fully wrapped, resulting in a lower strength of the mixed molding sand. The other is to mix the resin and curing agent in advance, mix them evenly, and then spray them onto the surface of the sand. In this way, the resin and curing agent are evenly mixed, but the curing reaction is quickly completed in a short time after mixing. The sand cannot be fully wrapped, resulting in a lower strength of the mixed molding sand. Utility Model Content
[0004] In order to solve the technical problem in the prior art that the resin and curing agent cannot fully wrap the sand particles, resulting in reduced strength of the mixed produced molding sand, the utility model provides the following technical solution.
[0005] The utility model discloses a resin curing agent conveying device with a mixing function, comprising a conveying cylinder with a sand inlet and a sand outlet respectively provided at both ends, a rotating main shaft being rotatably connected to both ends of the inner cavity of the conveying cylinder, a driving motor connected to the rotating main shaft being provided on the outer side of one end of the conveying cylinder, a spiral blade being provided on the outer periphery of the rotating main shaft extending from the sand inlet to the sand outlet, a curing agent feeding piece being connected to the sand inlet, a resin feeding piece having the same structure as the curing agent feeding piece being connected to the middle part of the conveying cylinder, a hollow portion being provided on the side of the rotating main shaft away from the driving motor, a plurality of air outlet holes being axially provided on the outer periphery of the hollow portion, and a second compressed air pipe being connected to the end of the air portion away from the resin feeding piece through a dynamic sealing sleeve, so that the compressed air can blow and stir the mixture.
[0006] As a further technical solution, the resin feeding part includes a feeding pipe provided with a metering valve connected to an external resin feeding pump and a sealing shell connected to the conveying cylinder. The end of the feeding pipe is connected to a feeding pipe connected to a spray head and extending into the sealing shell. One side of the feeding pipe is connected to a first compressed air pipe.
[0007] As a further technical solution, the spiral blades are loosely fitted with the inner wall of the conveying cylinder, and the spray head does not extend into the inner side of the inner wall of the conveying cylinder.
[0008] As a further technical solution, the outer diameter of the shower head is consistent with the inner diameter of the sealing shell to prevent sand from entering the interior of the sealing shell.
[0009] As a further technical solution, the air outlet holes are staggeredly distributed on the axial periphery of the hollow portion.
[0010] As a further technical solution, a vent valve is connected to the outer wall of the conveying cylinder between the resin feeding member and the sand discharge port.
[0011] The beneficial effect of the present invention is that the conveying cylinder of the present invention adds and mixes the curing agent and resin at intervals while conveying the sand, thereby preventing the premature hardening of the curing agent and resin from causing adverse effects on the molding sand, improving the mixing quality of the molding sand, and ensuring the strength of the molding sand. After the sand and the fixative are mixed, they are continuously mixed and advanced in the conveying cylinder. In the middle and rear section of the conveying cylinder, the resin is sprayed in and mixed with the sand and the curing agent. While the spiral blades are mixing them, compressed air enters the conveying cylinder through the second compressed air pipe and the air outlet. The compressed air can blow and mix the mixture of sand, curing agent and resin again, thereby improving the mixing speed and mixing uniformity of the three, allowing the curing agent and resin to evenly wrap the sand, and after being evenly mixed, they are quickly discharged from the sand discharge port for molding or core making, thereby preventing the molding sand from solidifying prematurely. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic structural diagram of a resin curing agent delivery device with a mixing function according to the present invention;
[0013] Figure 2 This is a schematic cross-sectional view of a delivery cylinder of a resin curing agent delivery device with a mixing function according to the present invention;
[0014] Figure 3 It is a schematic diagram of a resin feeding member of a resin curing agent conveying device with a mixing function according to the present invention;
[0015] In the figure: 1-conveying cylinder; 101-sand inlet; 102-sand outlet; 103-vent valve; 2-driving motor; 3-rotating main shaft; 301-hollow part; 302-air outlet; 4-spiral blade; 5-curing agent feed piece; 6-resin feed piece; 601-feed pipe; 602-metering valve; 603-discharge pipe; 604-first compressed air pipe; 605-sealing shell; 606-spray head; 7-dynamic sealing sleeve; 8-second compressed air pipe; 9-support plate. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.
[0017] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc. are used solely for descriptive purposes and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features referred to. In the description of this utility model, unless otherwise specified, "plurality" means two or more.
[0018] like Figure 1 and Figure 2As shown, the utility model is a resin curing agent conveying device with a mixing function, comprising a conveying cylinder 1 with a sand inlet 101 and a sand outlet 102 at both ends, the sand inlet 101 being located at one end of the upper part of the conveying cylinder 1, which is connected to an external sand bucket for the entry of sand particles; the sand outlet 102 being located at the other end of the lower part of the conveying cylinder 1, for discharging the molding sand after uniform mixing. Support plates 9 are connected to the lower parts of both ends of the conveying cylinder 1 for providing support for the conveying cylinder 1. A rotating main shaft 3 is rotatably connected to both ends of the inner cavity of the conveying cylinder 1, and the rotating main shaft 3 is located in the axial direction of the conveying cylinder 1. A driving motor 2 connected to the rotating main shaft 3 is provided on the outer side of one end of the conveying cylinder 1. The driving motor 2 is an existing reduction motor for driving the rotation of the rotating main shaft 3.
[0019] In a preferred embodiment, a spiral blade 4 is fixedly mounted on the outer periphery of the rotating main shaft 3. The spiral blade 4 extends from the sand inlet 101 to the sand outlet 102, facilitating the conveying of sand from the sand inlet 101 to the sand outlet 102. The spiral blade 4 rotates with the rotating main shaft 3 and, during the conveying process, mixes the sand with the curing agent and resin. To prevent the sand, curing agent, and resin from adhering to or solidifying the inner wall of the conveying barrel 1, the spiral blade 4 has a clearance fit with the inner wall of the conveying barrel 1, allowing any adhering material to be scraped off.
[0020] The sand inlet 101 is connected to a curing agent feeder 5, which is used to spray curing agent into the sand inlet 101, so that the curing agent evenly contacts the sand particles and then falls into the conveying barrel 1 with the sand particles for conveying and mixing. A resin feeder 6, which has the same structure as the curing agent feeder 5, is connected to the middle or rear portion of the conveying barrel 1. The resin feeder 6 is used to spray resin into the inner cavity of the conveying barrel 1, so that the resin is mixed with the sand particles and curing agent mixture again, and then discharged from the sand discharge port 102 after mixing.
[0021] In a preferred embodiment, a hollow portion 301 is provided on the side of the rotating main shaft 3 away from the drive motor 2, that is, a portion of the rotating main shaft 3 close to the drive motor 2 is solid, and a portion away from the drive motor 2 is a hollow hollow portion 301. The resin feed piece 6 is closer to the drive motor 2 than the hollow portion 301, so that the mixture of sand and curing agent contacts the resin before passing through the hollow portion 301. The end of the hollow portion 301 away from the resin feed piece 6 is connected to a second compressed air pipe 8 through a dynamic sealing sleeve 7. The second compressed air pipe 8 is connected to an external air compressor to provide high-pressure air to the hollow portion 301. A plurality of air outlet holes 302 are axially provided on the outer periphery of the hollow portion 301. The air outlet holes 302 are staggeredly distributed on the axial outer periphery of the hollow portion 301 so that the compressed air can blow and stir the mixture of sand, curing agent and resin in the conveying cylinder 1, thereby improving the mixing uniformity of the three. After the high-pressure air enters the inner cavity of the conveying cylinder 1, part of it can be discharged from the sand discharge port 102. In order to prevent the pressure in the conveying cylinder 1 from being too high, a vent valve 103 is connected to the outer wall of the conveying cylinder 1 between the resin feeding piece 6 and the sand discharge port 102, which can further discharge the high-pressure air in the conveying cylinder 1.
[0022] like Figure 1 and Figure 3 As shown, in a preferred embodiment, the curing agent feed member 5 and the resin feed member 6 have the same structure, with only the component names being different. The resin feed member 6 will be described in detail below. The resin feed member 6 includes a feed pipe 601 connected to an external resin feed pump. The feed pipe 601 is provided with a metering valve 602, which can monitor and control the resin feed flow in real time. The resin feed member 6 also includes a sealed shell 605 connected to the conveying cylinder 1. The end of the feed pipe 601 is connected to a feed pipe 603 extending into the sealed shell 605. One end of the feed pipe 603 extending into the sealed shell 605 is connected to a spray head 606. One side of the feed pipe 603 is connected to a first compressed air pipe 604, which is connected to an external air compressor for providing power for the spraying of the resin. To prevent the spiral blade 4 from causing wear on the spray head 606, the spray head 606 does not extend into the inner side of the inner wall of the conveying cylinder 1 and does not contact the spiral blade 4. The outer diameter of the spray head 606 is consistent with the inner diameter of the sealing shell 605 , which can prevent sand from entering the interior of the sealing shell 605 .
[0023] When the present invention is in use, the ratio of sand, curing agent and resin in the molding sand is usually 100:1:2, and the feed flow of the external sand bucket, curing agent feeding piece 5 and resin feeding piece 6 is controlled; first, the sand and curing agent are respectively added to the sand inlet 101, and the sand and curing agent are stirred and mixed by the spiral blade 4 while being transported in the conveying cylinder 1; then the resin feeding piece 6 controls the resin to be sprayed into the inner cavity of the conveying cylinder 1, and at the same time, the second compressed air pipe 8 provides high-pressure air to the hollow part 301, and while the spiral blade 4 mixes the sand, curing agent and resin, the compressed air enters the conveying cylinder 1 through the second compressed air pipe 8 and the air outlet 302, and the compressed air blows and mixes the mixture of sand, curing agent and resin again, and after being evenly mixed, the molding sand mixed by the three is quickly discharged from the sand discharge port 102, and then molding or core making is carried out as soon as possible to prevent the mixed molding sand from solidifying.
[0024] The preferred specific implementation methods and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above implementation methods and embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.
Claims
1. A resin curing agent conveying device with a mixing function, comprising a conveying cylinder (1) with a sand inlet (101) and a sand outlet (102) respectively provided at both ends, a rotating main shaft (3) being rotatably connected to both ends of the inner cavity of the conveying cylinder (1), and a driving motor (2) connected to the rotating main shaft (3) being provided on the outer side of one end of the conveying cylinder (1), characterized in that: The outer periphery of the rotating main shaft (3) is provided with a spiral blade (4) extending from the sand inlet (101) to the sand discharge port (102); the sand inlet (101) is connected to a curing agent feeding member (5); the middle part of the conveying cylinder (1) is connected to a resin feeding member (6) having the same structure as the curing agent feeding member (5); the side of the rotating main shaft (3) away from the driving motor (2) is provided with a hollow portion (301); the outer periphery of the hollow portion (301) is axially provided with a plurality of air outlet holes (302); the end of the air portion (301) away from the resin feeding member (6) is connected to a second compressed air pipe (8) through a dynamic sealing sleeve (7) so that the compressed air can blow and stir the mixed material.
2. The resin curing agent delivery device with mixing function according to claim 1, characterized in that: The resin feeding member (6) comprises a feeding pipe (601) connected to an external resin feeding pump and provided with a metering valve (602) and a sealing shell (605) connected to the conveying cylinder (1); the end of the feeding pipe (601) is connected to a discharge pipe (603) extending into the sealing shell (605) and connected to a spray head (606); and one side of the discharge pipe (603) is connected to a first compressed air pipe (604).
3. The resin curing agent delivery device with mixing function according to claim 2, characterized in that: The spiral blade (4) is in clearance fit with the inner wall of the conveying cylinder (1), and the spray head (606) does not extend into the inner side of the inner wall of the conveying cylinder (1).
4. The resin curing agent delivery device with mixing function according to claim 2, characterized in that: The outer diameter of the spray head (606) is consistent with the inner diameter of the sealing shell (605) to prevent sand from entering the interior of the sealing shell (605).
5. The resin curing agent delivery device with mixing function according to claim 1, characterized in that: The air outlet holes (302) are staggeredly distributed on the axial periphery of the hollow portion (301).
6. The resin curing agent delivery device with mixing function according to claim 1, characterized in that: An air release valve (103) is connected to the outer wall of the conveying cylinder (1) between the resin feeding member (6) and the sand discharge port (102).