A tapered equalization flow blowing and draining device

Abstract

The application provides a taper equalization flow blowing and exhausting device, relates to the technical field of mold processing, and comprises a shell and an inner core, and the shell and the inner core are symmetrical about a longitudinal vertical plane passing through a central axis; the inner core comprises a head and a columnar part which are connected integrally, the head is provided with a gas hole, and the central axis of the columnar part is provided with an air channel; the outer periphery of the head of the inner core is provided with a first taper surface and a second taper surface, and the inner wall of the shell is provided with a third taper surface; the longitudinal vertical plane intersects the first taper surface, the second taper surface and the third taper surface to form a first intersection line, a second intersection line and a third intersection line; the first intersection line and the third intersection line are parallel to each other to form a blowing and exhausting gap, and the gas hole is communicated with the blowing and exhausting gap. The application has the advantages that the consistency and accuracy of the exhaust flow are ensured, the problem of non-uniform gap and non-uniform exhaust of the traditional blowing and exhausting device is solved, the qualified rate of the precision mold in the production of products is solved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mold processing, in particular to a taper balanced flow blowing device. Background Art

[0002] When precision molds such as injection molds, rubber molds, blow molds, and die-casting molds are producing products, it is necessary to quickly exhaust the air in the mold cavity. The mold exhaust plug is a mold accessory used to discharge the air and other miscellaneous gases inside the mold to improve the quality of the mold product. It can also be called a honeycomb hole exhaust plug, a breathable plug, a vent plug, and a cylindrical exhaust plug. It is mainly used for exhausting low-pressure casting molds of non-ferrous metals and alloys such as aluminum alloys, copper, and tin, such as injection molding molds, gravity casting molds, vacuum casting molds, and low-pressure casting molds. The exhaust plugs have various series such as honeycomb holes, grooves, porous, and mesh shapes, and have been widely used in gravity casting, vacuum casting, injection molding and other processes.

[0003] However, the actual situation of current technology is that if the gap of the exhaust device is too large, glue leakage and overflow will occur, which may cause burrs on the product at the least and the product may be stuck in the mold cavity at the worst. If the gap of the exhaust device is too small, it will cause poor exhaust, which will cause unsatisfactory product injection, product burning, product deformation, low production efficiency and other undesirable phenomena.

[0004] Chinese patent publication CN209260446U discloses a vent plug specifically designed for paper and plastic molds. The disclosure states: It includes a vent plug body; the vent plug body comprises a columnar portion and a head portion connected in sequence along the axial direction of the vent plug body; the columnar portion is cylindrical, the head portion is flat-top conical, and the head portion gradually converges toward the end where the columnar portion is located and is connected to the columnar portion; the columnar portion is provided with an external thread spirally encircling the outer circumference of the columnar portion; an air avoidance hole extending axially inward is provided at one end of the columnar portion; and an axial exhaust hole is provided in the head portion, which passes through the head portion and is connected to the air avoidance hole. In other words, gas is discharged through the combination of the exhaust hole and the air avoidance hole.

[0005] However, actual processing has shown that due to processing and assembly errors, the size of such apertures is difficult to control, making it impossible to ensure that precision molds such as injection molds and blow molds can quickly and evenly exhaust air without leaking glue when producing products. Therefore, the present invention discloses a tapered balanced flow exhaust device to overcome the above-mentioned drawbacks. Summary of the Invention

[0006] The present invention overcomes the shortcomings of the prior art and provides a tapered balanced flow blowing and exhaust device, which solves the problems of uneven gaps and uneven exhaust in traditional blowing and exhaust devices, thereby solving the problem of low pass rate of precision molds in product production and improving production efficiency.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] A conical balanced flow blowing and exhaust device comprises an outer shell and an inner core installed in the outer shell, the central axes of the outer shell and the inner core coincide, and the outer shell and the inner core are symmetrical about the longitudinal vertical plane passing through the central axis; the inner core comprises a head and a cylindrical portion connected as a whole, the head is provided with an air hole, and the central axis of the cylindrical portion is provided with an air channel, which extends upward to communicate with the air hole; the outer periphery of the head position of the inner core is provided with a first conical surface and a second conical surface, and the inner wall of the outer shell is provided with a third conical surface; the longitudinal vertical plane intersects with the first conical surface, the second conical surface, and the third conical surface respectively to form a first intersection line, a second intersection line, and a third intersection line; when the inner core and the outer shell are in an assembled and used state, the second intersection line is tightly connected with the third intersection line, so that the second conical surface and the third conical surface are matched with zero gap to form a seal; the first intersection line and the third intersection line are parallel to each other to form a blowing and exhaust gap, and the air hole is connected to the blowing and exhaust gap.

[0009] Furthermore, the circumferential depression of the head of the inner core is provided with a groove, and the air holes are evenly distributed on the groove; the air holes are arranged opposite to each other in pairs, and the center line connecting the two holes is perpendicular to the central axis of the inner core.

[0010] Furthermore, a threaded connection portion is provided at the connection point between the lower ends of the outer shell and the inner core.

[0011] Furthermore, the upper surfaces of the inner core and the outer shell are both flat, and when the inner core is connected and fixed to the outer shell, the upper surfaces of the inner core and the outer shell are flush.

[0012] Furthermore, a hollow rotating part is provided at the lower end of the inner core, and the hollow part of the rotating part is connected to the airway; an external tool is inserted into the rotating part and rotated to generate torque, thereby driving the inner core to rotate relative to the outer shell along the thread.

[0013] Furthermore, the rotating portion includes a plurality of side surfaces connected end to end and surrounding the central axis of the inner core, and the side surfaces are perpendicular to the plane where the inner core rotates.

[0014] Furthermore, the housing is cylindrical.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The outer periphery of the head position of the inner core of the present invention is provided with a first conical surface and a second conical surface, and the first conical surface is offset and processed in one go on the basis of the second conical surface; the inner wall of the outer shell is provided with a third conical surface; an exhaust gap is formed between the first conical surface and the third conical surface, and the second conical surface and the third conical surface are matched with zero gap, which helps to ensure the consistency and accuracy of the exhaust flow, and at the same time solves the problems of uneven gap and uneven exhaust in traditional exhaust devices, thereby solving the pass rate of precision molds in product production and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and are used to explain the present invention together with the embodiments of the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 The present invention is a three-dimensional tapered balanced flow blowing device Figure 1 ;

[0019] Figure 2 The present invention is a three-dimensional tapered balanced flow blowing device Figure 2 ;

[0020] Figure 3 is a cross-sectional view of the tapered balanced flow blowing and exhausting device of the present invention;

[0021] Figure 4 It is an enlarged view of the blowing and exhaust gap in the cross-sectional view of the tapered balanced flow blowing and exhaust device of the present invention;

[0022] Figure 5 is a cross-sectional view of the tapered balanced flow blowing and exhausting device of the present invention in an exploded state;

[0023] Figure 6 This is an exploded view of the tapered balanced flow blowing and exhaust device of the present invention;

[0024] Figure 7 It is a three-dimensional cross-sectional view of the tapered balanced flow blowing and exhausting device of the present invention in an exploded state.

[0025] In the picture:

[0026] 1. Outer shell; 101. Third conical surface; 2. Inner core; 201. Air hole; 202. Air channel; 203. First conical surface; 204. Second conical surface; 205. Groove; 206. Rotating portion; 2061. Side surface; 3. Blowing and exhaust gap; 4. Threaded joint; 5. Vertical plane; 6. Center axis;

[0027] a. First intersection line; b. Second intersection line; c. Third intersection line. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] like Figures 1 to 7 As shown, the present invention requests a tapered balanced flow blowing device, which is used in precision molds such as injection molds, rubber molds, blow molds, etc. when producing products and needs to quickly exhaust the air in the mold cavity. Specifically, it includes an outer shell 1 and an inner core 2 installed in the outer shell 1. The outer shell 1 can be fixed to the mold by an interference fit, so the outer shell 1 is cylindrical and has a relatively smooth surface so that the outer shell 1 can be driven into the fixing hole of the mold; and the cylindrical structure will make the circumferential force of the outer shell 1 better, and it is not easy to be compressed and deformed when it is driven into the fixing hole of the mold.

[0030] The inner core 2 is detachably connected to the outer shell 1 to facilitate cleaning of the inner core 2 and the interior of the outer shell 1; a threaded connection portion 4 is provided at the junction of the lower ends of the outer shell 1 and the inner core 2, and the threaded connection portion 4 includes an internal thread on the inner wall of the outer shell 1 and an external thread on the outer periphery of the inner core 2. By matching the internal thread and the external thread, the inner core 2 can be detachably connected to the outer shell 1.

[0031] Combine Figure 3 、 Figure 6 as well as Figure 7 As shown, when the inner core 2 is connected to the outer shell 1, the outer shell 1 and the central axis 6 of the inner core 2 coincide, and the outer shell 1 and the inner core 2 are symmetrical about the longitudinal vertical plane 5 passing through the central axis 6, that is, the outer shell 1 and the inner core 2 themselves have a high degree of symmetry, which helps to uniformly bear the force on the whole; the inner core 2 includes a head and a columnar portion connected as a whole, the head is provided with an air hole 201, and the central axis of the columnar portion is provided with an air channel 202, which extends upward to communicate with the air hole 201; the outer periphery of the head position of the inner core 2 is provided with a first conical surface 203 and a second conical surface 204, and the inner wall of the outer shell 1 is provided with a third conical surface 101; the conical surface slopes of the first conical surface 203, the second conical surface 204 and the third conical surface 101 are the same.

[0032] The longitudinal vertical plane 5 intersects with the first conical surface 203, the second conical surface 204, and the third conical surface 101 respectively to form a first intersection line a, a second intersection line b, and a third intersection line c; when the inner core 2 and the outer shell 1 are in an assembled and used state, the second intersection line b and the third intersection line c are tightly connected to make the second conical surface 204 and the third conical surface 101 fit with zero gap to form a seal; the first intersection line a and the third intersection line c are parallel to each other to form a blowing and exhaust gap 3, and the air hole 201 is connected to the blowing and exhaust gap 3.

[0033] The effect of the above setting is that, when the mold cavity is vented, the airflow flows through the exhaust gap 3, flows to the air hole 201, and then flows from the air hole 201 to the air channel 202 to be discharged outside the mold; when blowing air into the mold cavity, the compressed air flows through the air pipe connecting the mold outside to the air channel 202, flows to the air hole 201, and blows into the mold cavity through the exhaust gap 3. Any longitudinal vertical plane 5 passing through the central axis 6 intersects with the first conical surface 203 and the third conical surface 101 to form a first intersection line a and a third intersection line c that are parallel to each other, that is, the exhaust gap size between the inner core 2 and the outer shell 1 formed by the exhaust gap 3 remains consistent, ensuring that the exhaust gap is absolutely balanced and eliminating the problem of uneven exhaust gap caused by processing errors.

[0034] In addition, the inner core 2 and the outer shell 1 are matched with each other in conical surfaces (the second conical surface 204 and the third conical surface 101), and can be matched to 0 clearance; the first conical surface 203 and the second conical surface 204 of the inner core 2 are processed at one time, so the coaxiality and relative position are accurately guaranteed. When the inner core 2 and the outer shell 1 are assembled together through the threaded connection part 4, the gap of the blowing and exhaust gap 3 is guaranteed to be uniform. Even if the inner core 2 is disassembled many times, it can be accurately returned to the outer shell each time it is disassembled and assembled, and the blowing and exhaust gap 3 always remains unchanged.

[0035] The present invention is inspired by the tool tip offset function during machining on a CNC lathe. When producing and machining the inner core 2, this function can ensure that the first conical surface 203 and the second conical surface 204 of the inner core 2 are at the same angle, and the offset position ensures absolute coaxiality and accurate relative position, thereby eliminating the problem of uneven blowing and exhaust gaps and uneven blowing and exhaust flow caused by machining errors, thereby improving the yield rate of mold production products and improving production efficiency; at the same time, it solves the problem of defective blowing and exhaust device caused by uneven blowing and exhaust gaps, effectively improving the production efficiency and yield rate of the blowing and exhaust device.

[0036] Due to processing errors and assembly errors, the current exhaust device cannot guarantee the consistency and accuracy of the exhaust gap below 0.01mm of the exhaust device, and thus cannot ensure that precision molds such as injection molds and blow molds can quickly and evenly exhaust without glue leakage when producing products.

[0037] The present invention effectively solves the exhaust flow consistency and accuracy of the 0.003mm-0.01mm exhaust gap blowing exhaust device, and solves the problem of uneven gap and unbalanced exhaust of the 0.01mm-0.03mm gap blowing exhaust device, thereby solving the qualified rate of precision molds in product production and improving production efficiency.

[0038] Therefore, through the structure of the tapered surface matching between the inner core 2 and the outer shell 1 and the resulting blowing and exhaust gap 3, an exhaust gap of a size that meets the use requirements can be produced.

[0039] like Figure 3 As shown, the circumferential depression of the head of the inner core 2 is provided with a groove 205 , and the air holes 201 are evenly distributed on the groove 205 ; the air holes 201 are arranged opposite to each other in pairs, and the center line connecting the two holes is perpendicular to the central axis 6 of the inner core 2 .

[0040] The second conical surface 204 and the third conical surface 101 are matched with zero clearance to form a seal, so that the gas flows in sequence along the set path of the airway 202, the air hole 201, and the blowing and exhaust gap 3, without leaking at other connecting parts between the outer shell 1 and the inner core 2, which helps to ensure the controllable flow rate.

[0041] The upper surfaces of the inner core 2 and the outer shell 1 are both flat, and when the inner core 2 is connected and fixed to the outer shell 1, the upper surfaces of the inner core 2 and the outer shell 1 are flush; since after installation, the upper surfaces of the inner core 2 and the outer shell 1 are facing the inner side of the mold cavity, the above design makes the inner side of the structure flat after the two are installed, and will not be affected by the processed objects in the mold cavity.

[0042] The lower end of the inner core 2 is provided with a hollow rotating portion 206. The hollow portion of the rotating portion 206 communicates with the air passage 202, meaning that the rotating portion 206 does not interfere with the use of the air passage 202, a clever design. An external tool inserted into the rotating portion 206 generates torque, thereby driving the inner core 2 to rotate along the thread relative to the outer shell 1. In this embodiment, the rotating portion 206 is designed as a hexagonal socket. Using an hexagonal wrench, the inner core 2 can be installed or removed.

[0043] Combine Figure 6 As can be seen, the rotating portion 206 includes a plurality of side surfaces 2061 connected end to end and surrounding the central axis 6 of the inner core 2 , and the side surfaces 2061 are perpendicular to the plane where the inner core 2 rotates.

[0044] Therefore, when the hexagonal screwdriver is inserted into the rotating part 206 and rotated, the force can be evenly transmitted to each side surface 2061. Since the side surface 2061 is perpendicular to the plane of the rotation direction of the inner core 2, that is, when the hexagonal screwdriver is rotated, its rotational force can basically act directly on the side surface 2061. The rotational force applied to the side surface 2061 is transmitted more thoroughly, avoiding waste of force and facilitating assembly and disassembly.

[0045] The present invention discloses a conical balanced flow blowing and exhaust device, wherein a first conical surface and a second conical surface are provided on the outer periphery of the head position of the inner core, and a third conical surface is provided on the inner wall of the outer shell; an exhaust gap is formed between the first conical surface and the third conical surface, and the second conical surface and the third conical surface are matched with zero gap, which helps to ensure the consistency and accuracy of the exhaust flow, and solves the problems of uneven gap and unbalanced exhaust in traditional exhaust blowing and exhaust devices, thereby solving the qualified rate of precision molds in product production and improving production efficiency.

[0046] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tapered balanced flow blowing device, characterized in that: The invention comprises an outer shell (1) and an inner core (2) installed in the outer shell (1), wherein the outer shell (1) and the inner core (2) coincide with the central axis (6), and the outer shell (1) and the inner core (2) are symmetrical about the vertical plane (5) passing through the central axis (6); the inner core (2) comprises a head portion and a column portion connected as one body, wherein the head portion is provided with an air hole (201), and the column portion is provided with an air passage (202) in the central axis, and the air passage (202) extends upward to communicate with the air hole (201); the outer periphery of the head portion of the inner core (2) is provided with a first conical surface (203) and a second conical surface (204), and the inner wall of the outer shell (1) is provided with a The third conical surface (101); the vertical plane (5) intersects with the first conical surface (203), the second conical surface (204), and the third conical surface (101) to form a first intersection line (a), a second intersection line (b), and a third intersection line (c); when the inner core (2) and the outer shell (1) are in an assembled state, the second intersection line (b) and the third intersection line (c) are tightly connected to form a zero-gap fit between the second conical surface (204) and the third conical surface (101) to form a seal; the first intersection line (a) and the third intersection line (c) are parallel to each other to form a blowing and exhaust gap (3), and the air hole (201) is connected to the blowing and exhaust gap (3).

2. The tapered balanced flow blowing device according to claim 1, characterized in that: The circumferential recess of the head of the inner core (2) is provided with a groove (205), and the air holes (201) are equidistantly distributed on the groove (205); the air holes (201) are arranged opposite to each other in pairs, and the center line connecting the two holes is perpendicular to the center axis (6) of the inner core (2).

3. The tapered balanced flow blowing device according to claim 1, characterized in that: A threaded connection portion (4) is provided at the connection point between the lower ends of the outer shell (1) and the inner core (2).

4. The tapered balanced flow blowing device according to claim 3, characterized in that: The upper surfaces of the inner core (2) and the outer shell (1) are both flat, and when the inner core (2) is connected and fixed to the outer shell (1), the upper surfaces of the inner core (2) and the outer shell (1) are flush.

5. The tapered balanced flow blowing device according to claim 3, characterized in that: The lower end of the inner core (2) is provided with a hollow rotating portion (206), and the hollow portion of the rotating portion (206) is communicated with the airway (202); an external tool is inserted into the rotating portion (206) and rotated to generate a torque, thereby driving the inner core (2) to rotate relative to the outer shell (1) along the thread.

6. The tapered balanced flow blowing device according to claim 5, characterized in that: The rotating portion (206) comprises a plurality of side surfaces (2061) connected end to end and surrounding the central axis (6) of the inner core (2), and the side surfaces (2061) are perpendicular to the plane of the rotation direction of the inner core (2).

7. The tapered balanced flow blowing device according to claim 1, characterized in that: The housing (1) is cylindrical.

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