Rotary drying frame for silica sol shell

Abstract

The invention relates to the technical field of precision investment casting, in particular to a rotary drying frame for a silica sol shell, which comprises a base, a vertical output motor is mounted in the base, the output end of the vertical output motor is fixedly connected with a main shaft, and a plurality of horizontal suspension beam groups are arranged in the height direction of the main shaft at certain intervals; according to the mold shell drying device, mold shells hung on the horizontal cross beams are driven by the main shaft to rotate, so that the drying consistency of the same batch of mold shells is guaranteed; autorotation of the suspended shell under different wind drying conditions is achieved through the wing type blade sets or the inner gear ring assemblies arranged in the rotary suspension assemblies, it is guaranteed that all parts of the shell are evenly heated, compared with the prior art, simultaneous autorotation of the multiple sets of suspension assemblies on one horizontal suspension beam is achieved, and the space utilization rate and the drying efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of investment casting, in particular to a rotary drying rack for silica sol shells. Background Art

[0002] Investment casting is a near-net-shape casting process with the highest precision and widest adaptability in the casting process. It is widely used in the aerospace industry. Multi-layer silica sol shell molds are generally used in investment casting processes. To ensure the quality of the final casting, drying of the silica sol shell is a very critical step.

[0003] During the shell drying process, the rotating drying rack ensures the drying consistency of the same batch of shells by constantly changing the position of the shells relative to the heat source compared to the stationary drying rack. Furthermore, by designing the self-rotation of a single shell, it is helpful for all parts of the single shell to be evenly affected by the heat source, thereby reducing local overheating or uneven drying. In the prior art, such as the Chinese patent "An intelligent adjustable shell drying box suitable for intelligent robot shell making line" with announcement number CN109341292B, a self-rotation and revolution mechanism is set for shell drying. However, it is worth considering that, on the one hand, the self-rotation mechanism it adopts includes a second motor that needs to rotate to realize the self-rotation function, causing the fixed structure of the motor to bear unexpected dynamic loads, and there is a problem of pulling the motor connecting line; on the other hand, the pulley self-rotation structure designed by it is suitable for the situation where only one set of suspension components is set on the beam. For the situation where multiple sets of suspension components are set on a beam, the belt drive driven self-rotation cannot be realized.

[0004] Therefore, there is a need for the emergence of a related device that better meets usage requirements. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a rotating drying rack for silica sol shells to solve the problem that the above-mentioned prior art devices cannot meet the requirement of simultaneous rotation of multiple groups of suspension components on a beam.

[0006] Based on the above objectives, the present invention provides two technical solutions.

[0007] The first technical solution: a rotary drying rack for silica sol shells, comprising a base, the base being a rectangular cavity structure, a vertical output motor being fixedly mounted at the center of the inner bottom surface of the base, a main shaft being fixedly connected to the output end of the vertical output motor, the main shaft vertically passing through the center of the top surface of the base, a plurality of horizontal suspension beam groups being fixedly connected to the main shaft along the height direction, the horizontal suspension beams at the same height being distributed in a ring shape, at least two groups of rotary suspension components being equidistantly arranged on each horizontal suspension beam, the rotary suspension components including blade groups, the rotary suspension components being used to suspend the shells to be dried, and hot air drying components being arranged outside and inside the base.

[0008] Furthermore, the horizontal suspension beams at different heights are staggered.

[0009] Furthermore, the rotating suspension assembly includes a vertically placed suspension shaft, which is rotatably connected to a horizontal suspension beam, a limiting cap is fixedly connected to the top end of the suspension shaft, a limiting ring is arranged between the limiting cap and the upper surface of the horizontal suspension beam, the limiting ring is sleeved on the suspension shaft, a blade group is fixedly connected to the middle and lower part of the suspension shaft, and a hook is fixedly connected to the bottom end of the suspension shaft.

[0010] Furthermore, the blade group is composed of three identical blades fixedly connected, each blade is fixedly connected to the side of the suspension shaft, the blade is wing-shaped, and the curved parts on both sides of the blade are the windward side and the leeward side, and the curvature of the windward side is smaller than that of the leeward side.

[0011] Furthermore, the drying component includes a horizontal hot air dryer arranged outside the base and a vertical hot air dryer arranged on the top of the base, and there is at least one horizontal hot air dryer and at least one vertical hot air dryer.

[0012] Furthermore, universal wheels are installed at four vertices of the bottom of the base.

[0013] Optionally, the rotary suspension assembly further includes a limit gear, which is meshingly connected to the inner gear ring assembly.

[0014] Furthermore, the inner gear ring assembly includes a bracket fixed to the ground, and the bracket has a multi-layer structure. Each layer of the bracket corresponds to a horizontal suspension beam group of different heights. Different layers of the bracket are connected using threaded sleeves. Each layer of the bracket is fixedly connected with at least two concentrically arranged inner gear rings. The number and radial spacing of the inner gear rings correspond to the number and spacing of the rotating suspension components on each horizontal suspension beam, and the inner gear rings are meshingly connected with the limit gear.

[0015] Beneficial effects of the present invention: The present invention drives the shell suspended on the horizontal beam to rotate through the main shaft, thereby ensuring the consistency of the drying of the shells in the same batch. The suspended shells are rotated under different wind drying conditions by the arranged wing-shaped blade group or inner gear ring assembly, which helps all parts of the shell to be evenly affected by the heat source. The above-mentioned blade group and concentric inner gear ring group rotation mechanism can realize the simultaneous rotation of multiple groups of suspension assemblies on one horizontal suspension beam, thereby improving space utilization and drying efficiency. A vertical hot air dryer is arranged on the top of the base of the present invention for drying the inside of a downward-opening mold shell, and the staggered arrangement of horizontal suspension beams at different heights ensures the consistency of vertical drying of the mold shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or 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 in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the internal structure of a base according to an embodiment of the present invention; Figure 3 It is a schematic top view of the entire embodiment 1 of the present invention; Figure 4 This is a schematic structural diagram of a rotary suspension assembly according to Embodiment 1 of the present invention; Figure 5 It is a schematic diagram of the overall structure of Embodiment 2 of the present invention; Figure 6 It is a schematic diagram of the partial structure of the rotary suspension assembly of Example 2 of the present invention; Figure 7 It is a schematic structural diagram of the inner gear ring assembly of embodiment 2 of the present invention.

[0018] Markings in the figure are: 1. base; 2. vertical output motor; 3. main shaft; 4. horizontal suspension beam; 501. suspension shaft; 502. limit ring; 503. limit cap; 504. blade group; 505. hook; 506. blade; 5061. windward side; 5062. leeward side; 507. limit gear; 508. bracket; 509. inner gear ring; 510. threaded sleeve; 511. connecting plate; 601. vertical hot air dryer; 7. universal wheel. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0020] Example 1: A rotating drying rack for silica sol shells, such as Figure 1 and Figure 2As shown, it includes a base 1 with a rectangular cavity structure, a vertical output motor 2 is fixedly installed at the center of the bottom surface of the base 1, and a main shaft 3 is fixedly connected to the output end of the vertical output motor 2. The main shaft 3 vertically passes through the center of the top surface of the base 1, and a total of 12 horizontal suspension beams 4 are fixedly connected to the main shaft 3 in three height directions. The four horizontal suspension beams 4 at the same height are distributed in a ring, and three groups of rotating suspension components are equidistantly arranged on each horizontal suspension beam 4. The rotating suspension component includes a blade group 504, and the rotating suspension component is used to suspend and rotate the shell to be dried. Four vertical hot air dryers 601 arranged symmetrically with respect to the center of the top surface of the base 1 are arranged on the top of the base 1, which are used for drying the inside of the shell with an opening downward. Horizontal hot air dryers are arranged on the rear and right sides of the base 1 to generate horizontal airflow to drive the suspension component with the blade group 504 to rotate, and universal wheels 7 are installed at the four vertices at the bottom of the base 1.

[0021] like Figure 3 As shown, the horizontal suspension beams 4 at different heights are staggered, and the rotating suspension components do not overlap when viewed from a top view, thereby improving space utilization and the efficiency of the vertical hot air dryer 601.

[0022] like Figure 4 As shown, the suspension shaft 501 in the rotary suspension assembly is vertically rotatably connected to the horizontal suspension beam 4, and the top end of the suspension shaft 501 is axially fixed to the horizontal suspension beam 4 through a limit cap 503 and a limit ring 502, so that the suspension shaft 501 can revolve around the main axis 3 with the horizontal suspension beam 4, and the bottom end is fixedly connected with a hook 505 for hanging the shell to be dried, and the middle and lower part of the suspension shaft 501 is fixedly connected with a blade group 504 composed of three blades 506. The blade 506 is wing-shaped, and consists of a windward side 5061 with a smaller curvature and a leeward side 5062 with a larger curvature. In the horizontal airflow generated by the horizontal hot air dryer, the windward side 5061 has a small curvature angle, and the airflow path on the windward side 5061 is smaller than that on the leeward side 5062, and the airflow speed is slow. According to Bernoulli's principle, the pressure is high where the airflow speed is slow, and the windward side 5061 generates thrust to drive the blade group 504 to rotate.

[0023] The working process and principle of this embodiment are as follows: the device is moved into the drying room by the universal wheel 7, the produced silica sol mold shell is hung on the hook 505, the external horizontal hot air dryer is turned on, the bottom vertical output motor 2 and the vertical hot air dryer 601 are turned on, the output end of the bottom vertical output motor 2 is connected to the main shaft 3 and starts to rotate, driving the horizontal suspension beam 4 and the suspension shaft 501 thereon to rotate, and then driving the mold shell on the hook 505 to rotate around the main shaft 3. During the rotation process, the position of the mold shell relative to the heat source is constantly changed, ensuring the drying consistency of the same batch of mold shells. At the same time, the horizontal airflow generated by the horizontal hot air dryer drives the blade group 504 to rotate, and the blade group 504 drives the suspended mold shell to rotate, which helps all parts of the mold shell to be evenly affected by the heat source, reduces the stress concentration of the mold shell caused by the local drying speed being too fast, and reduces the risk of mold shell deformation. Further, the blade group 504 at the same height is equally subjected to wind force, ensuring that multiple groups of suspension components on a horizontal suspension beam 4 can rotate at the same time, improving space utilization and drying efficiency.

[0024] The mold shell rotates and revolves simultaneously under the action of the hot air drying component, so that the mold shell is dried evenly and quickly. Example 2: A rotating drying rack for silica sol shells, such as Figure 5 and Figure 2 As shown, it includes a base 1 with a rectangular cavity structure, a vertical output motor 2 is fixedly installed at the center of the bottom surface of the base 1, and a main shaft 3 is fixedly connected to the output end of the vertical output motor 2. The main shaft 3 vertically passes through the center of the top surface of the base 1, and a total of 12 horizontal suspension beams 4 are fixedly connected to the main shaft 3 in three height directions. The 12 horizontal suspension beams 4 are staggered, and four horizontal suspension beams 4 at the same height are distributed in a ring shape. Three groups of rotating suspension components are equidistantly arranged on each horizontal suspension beam 4, and the rotating suspension component includes an inner gear ring component. The rotating suspension component is used to suspend and rotate the shell to be dried. Four vertical hot air dryers 601 are symmetrically arranged relative to the center of the top surface of the base 1 at the top of the base 1, which are used for drying the inside of the shell with an opening downward, and universal wheels 7 are installed at the four vertices of the bottom of the base 1.

[0025] like Figure 6 As shown, the suspension shaft 501 in the rotating suspension assembly is vertically rotatably connected to the horizontal suspension beam 4, and the top end of the suspension shaft 501 is axially fixed to the horizontal suspension beam 4 through a limiting gear 507 and a limiting ring 502, so that the suspension shaft 501 can revolve around the main axis 3 with the horizontal suspension beam 4, and the bottom end of the suspension shaft 501 is fixedly connected with a hook 505 for hanging the mold shell to be dried, and the limiting gear 507 is meshed with the inner gear ring 509 in the inner gear ring assembly.

[0026] like Figure 7As shown, the inner gear ring assembly includes a three-layer structural bracket 508 fixed to the ground, each layer of the bracket 508 corresponds to a horizontal suspension beam 4 of a different height, and different layers of the bracket 508 are connected by a threaded sleeve 510 to facilitate disassembly and installation. Each layer of the bracket 508 is fixedly connected with three concentrically arranged inner gear rings 509, and the inner gear rings 509 are fixedly connected by connecting plates 511. The radial spacing of the inner gear rings 509 corresponds to the spacing of the rotating suspension assemblies on each horizontal suspension beam 4, ensuring that the limiting gears 507 in each group of rotating suspension assemblies are meshed and connected with the inner gear rings 509.

[0027] Working process and principle of this embodiment: In some drying workshops, the drying rack is located far away from the horizontal airflow, and due to space limitations, a horizontal air supply component cannot be set. In this case, the technical solution of this embodiment is adopted. The working principle and process similar to those of Embodiment 1 are not repeated here. The difference in the working form lies in the process of the shell realizing self-rotation: During the process of the suspension shaft 501 revolving around the main axis 3 with the horizontal suspension beam 4, the limit gear 507 at its top moves relative to the internal gear ring 509 that remains fixed. The relative movement of the meshing parts drives the limit gear 507 and the suspension shaft 501 to rotate, and the silica sol shell of the hook 505 suspended on the suspension shaft 501 rotates. Since each set of rotating suspension components is meshed with the internal gear ring 509, multiple sets of suspension components on a horizontal suspension beam 4 can rotate at the same time, thereby improving space utilization and drying efficiency.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. A rotating drying rack for silica sol shells, comprising a base (1), characterized in that: The base (1) is a rectangular hollow structure, a vertical output motor (2) is fixedly mounted at the center of the bottom surface of the base (1), the output end of the vertical output motor (2) is fixedly connected to a main shaft (3), the main shaft (3) vertically passes through the center of the top surface of the base (1), and the main shaft (3) is fixedly connected to a plurality of horizontal suspension beams (4) along the height direction, the horizontal suspension beams (4) at the same height are distributed in a ring shape, and at least two groups of rotating suspension components are equidistantly arranged on each horizontal suspension beam (4), and hot air drying components are arranged outside and inside the base (1).

2. The rotary drying rack for silica sol shell according to claim 1, characterized in that: The horizontal suspension beams (4) are staggered at different heights.

3. The rotary drying rack for silica sol shell according to claim 1, characterized in that: The rotary suspension assembly comprises a vertically placed suspension shaft (501), the suspension shaft (501) being rotatably connected to a horizontal suspension beam (4), the top end of the suspension shaft (501) being fixedly connected to a limiting cap (503), a limiting ring (502) being arranged between the limiting cap (503) and the upper surface of the horizontal suspension beam (4), the limiting ring (502) being sleeved on the suspension shaft (501), a blade group (504) being fixedly connected to the middle and lower part of the suspension shaft (501), and a hook (505) being fixedly connected to the bottom end of the suspension shaft (501).

4. The rotary drying rack for silica sol shell according to claim 3, characterized in that: The blade group (504) is composed of three identical blades (506) that are fixedly connected, each blade (506) being fixedly connected to a side of the suspension shaft (501), the blade (506) being in the shape of an airfoil, the curved portions on both sides of the blade (506) being respectively a windward side (5061) and a leeward side (5062), and the degree of curvature of the windward side (5061) being smaller than that of the leeward side (5062).

5. The rotary drying rack for silica sol shell according to claim 4, characterized in that: The hot air drying assembly comprises a horizontal hot air dryer arranged outside the base (1) and a vertical hot air dryer (601) arranged at the top of the base (1), and there is at least one horizontal hot air dryer and at least one vertical hot air dryer (601).

6. The rotary drying rack for silica sol shell according to claim 3, characterized in that: The rotary suspension assembly further comprises a limit gear (507), the limit gear (507) being meshingly connected with the inner gear ring assembly.

7. The rotary drying rack for silica sol shell according to claim 6, characterized in that: The inner gear ring assembly comprises a bracket (508) fixed to the ground, the bracket (508) being a multi-layer structure, each layer of the bracket (508) corresponding to a horizontal suspension beam (4) of a different height, different layers of the bracket (508) being connected by a threaded sleeve (510), each layer of the bracket (508) being fixedly connected to at least two concentrically arranged inner gear rings (509), a connecting plate (511) being fixedly connected between the inner gear rings (509), the number and radial spacing of the inner gear rings (509) corresponding to the number and spacing of the rotating suspension components on each horizontal suspension beam (4), and the inner gear rings (509) being meshingly connected to the limit gear (507).

8. The rotary drying rack for silica sol shell according to claim 1, characterized in that: Universal wheels (7) are installed at four vertices of the bottom of the base (1).

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