Cooling mechanism of investment casting shell-making slurry stirring barrel

Abstract

The invention relates to the technical field of slurry cooling, in particular to an investment casting shell-making slurry stirring barrel cooling mechanism which comprises a base, a cooling assembly, a temperature sensor and a controller, the base is rotationally connected with a barrel body used for containing slurry through a driving part, and an L-shaped stirring part is arranged in the barrel body; the stirring part comprises a connecting shaft and a stirring blade movably connected to the connecting shaft through a connecting assembly, the stirring blade is located at the position close to the bottom end of the connecting shaft, and the length extension direction of the stirring blade is perpendicular to the axial direction of the connecting shaft. When the barrel body rotates to drive internal slurry to rotate to be in contact with the stirring blades for slurry stirring, the contact area with the slurry can be increased, redundant heat in the slurry barrel can be taken away, and therefore the cooling efficiency can be improved, and the cooling effect can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of slurry cooling, in particular to a cooling mechanism for a slurry stirring barrel for investment casting shell making. Background Art

[0002] Investment casting, also known as lost wax casting, is a casting method in which a precise pattern is made of fusible material, a refractory material is coated on it to make a shell, the pattern is melted away to obtain a hollow refractory shell, the shell is roasted and then poured with molten metal, and the shell is removed after the metal cools to obtain a casting. In the shell making process, slurry is needed to coat the wax pattern. In order to ensure the good performance of the slurry, a stirring barrel is needed to continuously stir the prepared slurry.

[0003] In the existing slurry barrel, during the continuous stirring process, due to the certain viscosity of the slurry, it is inevitable that the slurry will be deposited on the surface of the stirring blade and the inner wall of the stirring barrel over time. Under normal circumstances, during the stirring process, there is no interference between the stirring blade and the inner wall of the stirring barrel; but when more and more slurry is deposited on the surface of the blade and the inner wall of the stirring barrel, the stirring blade begins to contact and interfere with the inner wall of the stirring barrel during rotation, causing friction. The continuous friction will generate a certain amount of heat, and when the blade moves in the slurry, it will generate a certain amount of friction with the slurry itself. This friction will generate heat to a certain extent, and when high-speed stirring or high-viscosity slurry is stirred, the friction inside the slurry and between the slurry and the blades will increase. As the heat continues to accumulate, the chemical composition of the slurry changes, which may affect the rheological properties of the slurry, the uniformity of the coating and the quality of the mold shell, and will have an adverse effect on the performance of the slurry. At present, cooling is usually achieved by configuring a cooling pipe on the outer wall of the stirring barrel. The contact area is limited, the cooling effect usually does not achieve the expected effect, and the overall cooling effect is poor.

[0004] Based on the above situation, we propose a cooling mechanism for the investment casting shell slurry stirring barrel to solve the above problems. Summary of the invention

[0005] The invention provides a cooling mechanism for a shell-making slurry stirring barrel in investment casting, so as to solve the problem in the prior art that the shell-making slurry stirring barrel is prone to generate heat when stirring the internal slurry.

[0006] The technical problem solved by the present invention is achieved by adopting the following technical solutions: A cooling mechanism for a slurry stirring barrel for investment casting shell making, comprising a base, a barrel body for containing slurry being rotatably connected to the base through a driving member, an L-shaped stirring member being arranged inside the barrel body, the stirring member comprising a connecting shaft and a stirring blade movably connected to the connecting shaft through a connecting assembly, the stirring blade being located near the bottom end of the connecting shaft, and the length extension direction of the stirring blade being perpendicular to the axial direction of the connecting shaft; A cooling component, the cooling component includes a refrigeration box for containing a cooling medium and a cooling circulation pipeline for circulating the cooling medium in the refrigeration box to the stirring blade, the cooling circulation pipeline includes a cooling pipe located in the stirring blade and a transmission pipe connected to the input end and the output end of the cooling pipe, an annular pipe is connected to the output end of the transmission pipe, the input end of the transmission pipe is connected to the output end of the refrigeration box, and a return pipe is provided between the annular pipe and the refrigeration box, and a pump body for pumping the cooling medium is provided on the return pipe; A temperature sensor is disposed inside the barrel and is used to detect the temperature of the slurry inside the barrel; The controller is used to control the connection component to adjust the stirring angle of the stirring blade to change the shear force during stirring after receiving the temperature signal from the temperature sensor.

[0007] Preferably, the connecting assembly includes a rotating member rotatably connected to the connecting shaft and fixedly connected to the end of a stirring blade at one end, the rotating member extending to the inside of the connecting shaft is provided with a gear at one end, and the middle part of the connecting shaft is provided with a toothed plate member meshing with the gear, and the toothed plate member is driven by a telescopic member provided on the inner top wall of the connecting shaft to realize up and down movement.

[0008] Preferably, the cooling pipe is spiral or serpentine shaped.

[0009] Preferably, a heat exchange fin is provided inside the cooling pipe, and the other end of the heat exchange fin extends to the outside of the stirring blade.

[0010] Preferably, the cooling pipe is located at one end of the stirring blade close to the axis of the barrel and is connected to a cooling manifold.

[0011] Preferably, an arc portion is provided at the upper end of the stirring blade and at one end of the stirring blade close to the axis of the barrel body, and the protruding direction of the arc portion is tangent to the circular rotation trajectory of the stirring blade.

[0012] Preferably, the delivery pipe and the return pipe are both made of flexible material, and the delivery pipe and the return pipe are connected to the connecting shaft through a binding member.

[0013] Preferably, the refrigeration box is connected to the base, and the top end of the connecting shaft is connected to the refrigeration box.

[0014] The present invention has the following beneficial effects: The cooling medium is circulated through the stirring blades through the cooling component. When the barrel rotates, the internal slurry is driven to rotate and contact with the stirring blades to stir the slurry. At the same time, the contact area with the slurry is increased, and the excess heat in the slurry barrel is taken away, thereby improving the cooling efficiency, ensuring the cooling effect, and making the cooling effect of the slurry more uniform.

[0015] The temperature of the slurry is detected in real time by a temperature sensor, and the angle of the stirring blade is adjusted according to the temperature range of the slurry to produce different slurry flow patterns and shear forces, thereby achieving a more ideal stirring effect, ensuring that the slurry is fully mixed and uniform, extending the usable period of the slurry, and reducing manufacturing costs while ensuring the stability of product quality in the shell making process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 An isometric structural schematic diagram provided by the present invention; Figure 2 A schematic diagram of a cross-sectional structure provided by the present invention; Figure 3 This is a schematic diagram of the connection structure between the cooling circulation pipeline and the stirring blades in the present invention; Figure 4 It is a schematic diagram of the structure when the stirring blades in the present invention are turned over; Figure 5 It is a schematic diagram of a partial cross-sectional structure of the tooth plate member meshing with the gear in the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the stirring blade in the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the stirring blade in the present invention.

[0018] In the figure, 1. base; 11. driving member; 12. barrel; 13. connecting shaft; 14. stirring blade; 15. arc-shaped portion; 2. refrigeration box; 21. refrigeration element; 3. cooling circulation pipeline; 32. cooling pipe; 33. transmission pipe; 34. annular pipe; 35. return pipe; 36. pump body; 37. heat exchange fins; 38. cooling manifold; 4. temperature sensor; 5. controller; 6. rotating member; 61. gear; 62. tooth plate member; 63. telescopic member; 64. rack; 65. connecting rod; 7. binding member. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0020] Reference Figure 1-Figure 7 As shown, a cooling mechanism for a slurry stirring barrel for investment casting shell making comprises a base 1, on which a driving member 11 is provided, wherein the driving member 11 can adopt a motor or other device to drive a barrel body 12 for containing slurry, and an "L"-shaped stirring member is provided inside the barrel body 12, wherein the structure of the barrel body 12 is not limited, and the inner and outer walls can be integrated for synchronous rotation, or the inner and outer walls can be separated for rotation of the inner wall alone. The integrated structure is relatively easy to design and manufacture, with low cost and maintenance difficulty, and power can be directly applied to the barrel body 12, with high transmission efficiency, while the separate structure can reduce the contact with the external environment because the outer wall is fixed. The friction of objects prolongs the service life of the barrel body 12, so the structure of the barrel body 12 can be personalized according to the use requirements. The stirring member includes a connecting shaft 13 and a stirring blade 14 movably connected to the connecting shaft 13 through a connecting assembly. When the driving member 11 drives the barrel body 12 to rotate continuously and drives the slurry inside it to rotate, the slurry viscosity and the friction between the slurry and the stirring blade 14 may generate heat, causing the slurry temperature to rise, affecting the performance of the slurry. For this reason, the slurry needs to be cooled. In order to overcome the problem of poor cooling effect by setting a cooling pipe on the outer wall of the stirring barrel in the prior art, this solution makes the following improvements: Specifically, refer to Figure 3As shown, it also includes a cooling component, which includes a refrigeration box 2 for containing a cooling medium and a cooling circulation pipeline 3 for circulating the cooling medium in the refrigeration box 2 to the stirring blade 14. A refrigeration element 21, such as a condenser, is provided inside the refrigeration box 2 to cool the cooling medium. The cooling medium can be a coolant or a gas. The cooling circulation pipeline 3 includes a cooling pipe 32 located in the stirring blade 14 and a transmission pipe 33 connected to the input end and the output end of the cooling pipe 32. An annular pipe 34 is connected to the output end of the transmission pipe 33. The cooling medium in the refrigeration box 2 is discharged into the transmission pipe 33, and then transmitted to the cooling pipe 32 in the stirring blade 14 through the transmission pipe 33. The number of transmission pipes 33 is set accordingly according to the number of stirring blades 14, and the stirring blades 14 are located at the bottom end of the connecting shaft 13. The length extension direction of the stirring blades 14 is perpendicular to the axial direction of the connecting shaft 13. The connecting shaft 13 is located in the direction close to the inner wall of the barrel body 12, and will not occupy the center of the barrel body 12 during the stirring process. The working area of ​​the shell product can be normally put into the center of the barrel body 12 for slurry dipping. If the connecting shaft 13 is axially provided with multiple groups of stirring blades 14, multiple groups of conveying pipes 33 are provided. The cooling pipes 32 in the stirring blades 14 are connected through the conveying pipes 33, and finally enter the annular pipe 34. After that, under the action of the pump body 36, the cooling medium flowing through the stirring blades 14 is re-flowed through the refrigeration box 2 through the reflux pipe 35 for re-cooling. However, it is preferred to set the number of stirring blades 14 to one. If multiple stirring blades 14 are axially provided on the connecting shaft 13, it may affect the shell product being placed in the barrel body 12 for slurry dipping operation. When the barrel body 12 rotates and drives the internal slurry to rotate, it contacts the stirring blades 14. Through the cooling pipes 32 inside the stirring blades 14, the slurry contacted during stirring can be cooled down, and the effect is better. In order to enable the barrel body 12 to drive the internal slurry to rotate synchronously, a disturbance plate or the like can be provided on the inner wall of the barrel body 12 to avoid the smooth surface inside the barrel body 12, which makes it impossible to drive the slurry to move. At the same time, it also includes a temperature sensor 4 and a controller 5. The temperature sensor 4 is arranged inside the barrel body 12 to detect the temperature of the slurry inside the barrel body 12. The controller 5 is used to control the connection component to adjust the stirring angle of the stirring blade 14 to change the shear force during stirring after receiving the temperature signal of the temperature sensor 4. When the temperature sensor 4 detects that the slurry temperature in the barrel body 12 exceeds or is lower than the set threshold, it will transmit the signal to the controller 5. The controller 5 controls the action of the connection component to adjust the angle of the stirring blade 14 so that the stirring blade 14 takes a self-adaptive shape according to the slurry temperature. When the temperature is high, a larger cooling contact surface is expanded, and when the temperature is suitable, it shrinks to reduce resistance and energy consumption.

[0021] Specifically, refer to Figure 5As shown, the connecting assembly includes a rotating member 6 rotatably connected to the connecting shaft 13 and fixedly connected to the end of the stirring blade 14 at one end. The rotating member 6 extends to one end of the connecting shaft 13 and is provided with a gear 61. The middle part of the connecting shaft 13 is provided with a toothed plate member 62 meshing with the gear 61. Figure 4 as well as Figure 5 As shown, the tooth plate member 62 includes a connecting rod 65 located in the middle of the connecting shaft 13 and a rack 64 arranged on the side wall of the connecting rod 65. The tooth plate member 62 is driven to move up and down by a telescopic member 63 arranged on the inner top wall of the connecting shaft 13. The telescopic member 63 can be a mechanism capable of reciprocating linear motion such as an electric telescopic rod or a hydraulic rod. The main function is to drive the tooth plate member 62 to move up and down and drive the gear 61 meshing therewith to rotate. When the gear 61 drives the rotating member 6 to rotate a certain angle, the rotating member 6 drives the stirring blade 14 to adjust the angle. For example, when the slurry temperature increases and the viscosity decreases, the stirring blade 14 can automatically reduce the angle to reduce excessive stirring and foam generation; conversely, when the slurry temperature decreases and the viscosity increases, the stirring blade 14 can automatically increase the angle to ensure uniform mixing of the slurry. When the stirring blade 14 is in a vertical state, that is, the length extension direction of the stirring blade 14 is parallel to the horizontal plane of the stirring blade 14, at this time the stirring blade 1 4 has the largest contact resistance with the slurry. While the cooling effect is better, the slurry will be easily bubbled due to the large degree of turbulence. When the slurry temperature is reduced to a reasonable range, the stirring blade 14 is tilted at a certain angle. There is a certain angle between the length extension direction of the stirring blade 14 and the horizontal plane of the stirring blade 14, and this angle is located on the side of the rotation direction of the stirring blade 14, which is an acute angle. The inclined stirring blade will change the flow pattern inside the slurry, making the flow more stable and orderly, reducing violent turbulence and eddy currents, adjusting the shear force distribution on the slurry, making the shearing action more uniform and gentle, thereby avoiding local excessive shearing that causes gas mixing and forming a large amount of foam. Therefore, when the slurry temperature is high, the stirring blade 14 can be kept in a vertical state to cool down as quickly as possible to obtain the best cooling effect. When the slurry temperature reaches a reasonable range, the stirring blade can be adjusted to a tilted state to reduce the resistance and shear force with the slurry during rotation, thereby reducing bubble generation.

[0022] Further, see Figure 7 As shown, the cooling pipe 32 is spiral or snake-shaped to increase the contact area between the cooling pipe 32 and the stirring blade 14, so that the cooling effect is better when the stirring blade 14 stirs the slurry. Since the thickness of the stirring blade 14 is not easy to be too thick, it is preferably adopted a snake-shaped structure so that it can be more evenly distributed in the stirring blade 14, but it is not limited to the above two shapes, and it can also be set to a "U" shape according to the shape and size of the stirring blade 14.

[0023] Further, see Figure 6As shown, a heat exchange fin 37 is provided inside the cooling pipe 32, and the other end of the heat exchange fin 37 extends to the outside of the stirring blade 14. The cold air inside the cooling pipe 32 is conducted to the external slurry through the heat exchange fin 37, thereby cooling the external slurry and further improving the cooling efficiency of the slurry.

[0024] Among them, since the front end of the stirring blade 14 is the part that directly impacts and cuts into the slurry, the relative movement speed and contact pressure with the slurry are relatively large, the shear force and friction force it is subjected to are usually more significant, and it is easier to generate heat. Therefore, a cooling manifold 38 is connected to the end of the cooling pipe 32 located at the stirring blade 14 close to the axis of the barrel body 12, and part of the cooling medium in the cooling pipe 32 will enter the cooling manifold 38, thereby improving the heat dissipation effect on the front end of the stirring blade 14.

[0025] Further, see Figure 6 As shown, the upper end of the stirring blade 14 and the end of the stirring blade 14 close to the axis of the barrel body 12 are both provided with an arc portion 15, and the protruding direction of the arc portion 15 is tangent to the circular rotation trajectory of the barrel body 12, so that the edge of the stirring blade 14 on one side of the rotation direction is smoother, reducing the angle of the sharp edge, thereby reducing the resistance and shear force caused by the impact of the slurry and reducing frictional heat.

[0026] Among them, the conveying pipe 33 and the return pipe 35 are both made of flexible material. When the angle of the stirring blade 14 is adjusted, the conveying pipe 33 and the return pipe 35 can be adjusted to a certain extent accordingly. The conveying pipe 33 and the return pipe 35 are both connected to the connecting shaft 13 through a binding member 7. The binding member 7 can be a connecting rope or a connecting rod or other structures to prevent the slurry in the barrel body 12 from moving. The viscosity of the slurry will cause a pulling force on the conveying pipe 33 and the return pipe 35, resulting in the conveying pipe 33 and the return pipe 35 being broken or leakage at the joint.

[0027] Furthermore, the refrigeration box 2 is connected to the base 1, and the top end of the connecting shaft 13 is connected to the refrigeration box 2, which can support the refrigeration box 2 and fix the stirring element on the side of the barrel body 12 away from its axis, which will not affect the removal of the mold shell from the barrel body 12 for slurry sticking operation.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cooling mechanism for a mixing barrel of a slurry for investment casting shell making, characterized in that: include; A base (1), wherein a barrel (12) for containing slurry is rotatably connected to the base (1) via a driving member (11), an "L"-shaped stirring member is provided inside the barrel (12), the stirring member comprises a connecting shaft (13) and a stirring blade (14) movably connected to the connecting shaft (13) via a connecting assembly, the stirring blade (14) is located near the bottom end of the connecting shaft (13), and the length extension direction of the stirring blade (14) is perpendicular to the axial direction of the connecting shaft (13); A cooling component, the cooling component comprising a refrigeration box (2) for containing a cooling medium and a cooling circulation pipeline (3) for circulating the cooling medium in the refrigeration box (2) to the stirring blade (14), the cooling circulation pipeline (3) comprising a cooling pipe (32) located in the stirring blade (14) and a transmission pipe (33) connected to the input end and the output end of the cooling pipe (32), an annular pipe (34) being connected to the output end of the transmission pipe (33), the input end of the transmission pipe (33) being connected to the output end of the refrigeration box (2), a return pipe (35) being provided between the annular pipe (34) and the refrigeration box (2), and a pump body (36) for pumping the cooling medium being provided on the return pipe (35); a temperature sensor (4), the temperature sensor (4) being arranged inside the barrel (12) and being used to detect the temperature of the slurry inside the barrel (12); A controller (5) is used to control the connection component to adjust the stirring angle of the stirring blade (14) to change the shear force during stirring after receiving the temperature signal from the temperature sensor (4).

2. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: The connecting assembly comprises a rotating member (6) rotatably connected to the connecting shaft (13) and having one end fixedly connected to the end of the stirring blade (14); one end of the rotating member (6) extending into the interior of the connecting shaft (13) is provided with a gear (61); a toothed plate member (62) meshing with the gear (61) is provided in the middle of the connecting shaft (13); the toothed plate member (62) is driven by a telescopic member (63) provided on the inner top wall of the connecting shaft (13) to achieve up and down movement.

3. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: The cooling pipe (32) is in a spiral or snake shape.

4. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: A heat exchange fin (37) is provided inside the cooling pipe (32), and the other end of the heat exchange fin (37) extends to the outside of the stirring blade (14).

5. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: The cooling pipe (32) is located at one end of the stirring blade (14) close to the axis of the barrel body (12) and is connected to a cooling manifold (38).

6. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: An arc portion (15) is provided at the upper end of the stirring blade (14) and at one end of the stirring blade (14) close to the axis of the barrel body (12), and the protruding direction of the arc portion (15) is tangent to the circular rotation trajectory of the stirring blade (14).

7. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: The delivery pipe (33) and the return pipe (35) are both made of flexible material, and the delivery pipe (33) and the return pipe (35) are both connected to the connecting shaft (13) via a binding member (7).

8. The cooling mechanism for the investment casting shell slurry mixing barrel according to claim 1, characterized in that: The refrigeration box (2) is connected to the base (1), and the top end of the connecting shaft (13) is connected to the refrigeration box (2).

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