Non-contact constant-pressure adsorption positioning mechanism

Abstract

The invention discloses a non-contact constant-pressure adsorption positioning mechanism which comprises a positioning base and a plurality of rows of mounting holes formed in the positioning base in an array mode, a cyclone clamping body is mounted in each mounting hole, an air inlet pipeline communicated with each mounting hole is formed in the positioning base, and the air inlet pipeline is used for circulating compressed air; a porous membrane attached to the cyclone clamping body is fixed on the positioning base; the cyclone clamping body comprises a shaft sleeve installed in the installation hole in a sealed mode, a stepped hole is formed in the shaft sleeve, an air compression core is rotatably installed in the stepped hole, an annular groove is formed in the air compression core, and a circulation hole is formed in the air compression core. An air guide head is arranged on the air compression core; a conical surface inclined towards one side of the stepped hole is arranged on the shaft sleeve; an air pressure sensor is embedded in the shaft sleeve; an inlet of the air inlet pipeline is connected with an adjusting valve; and an air suspension state is formed, so that the conditions of clamping damage, damage or scratches are avoided in the polishing and grinding process, and the polishing and grinding efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polishing and grinding of fragile products, and particularly to a non-contact constant-pressure adsorption and positioning mechanism. Background Art

[0002] Fragile products such as ceramics, optical glass, and electronic components need to be polished and ground in the final process. Usually, polishing and grinding equipment is used for processing. The fragile products are clamped and positioned by the clamping tooling in the polishing and grinding equipment, and the surface grinding and polishing are realized through the polishing wheel. During the clamping state and the polishing operation process, certain forces are applied to the fragile products, which may cause the fragile products to be clamped, damaged, scratched, etc. Especially for fragile products with a thin-walled structure, it is more difficult to achieve a clamping method with a protective effect and meeting the positioning requirements during the polishing and grinding process. Summary of the Invention

[0003] (1) Technical Problem

[0004] The purpose of the present invention is to provide a non-contact constant-pressure adsorption and positioning mechanism to solve the problem that the fragile products with a thin-walled structure are prone to be clamped, damaged or scratched during the polishing and grinding process after being clamped and positioned in the prior art.

[0005] (2) Technical Solution

[0006] To achieve the above purpose, the present invention provides the following technical solution:

[0007] A non-contact constant-pressure adsorption and positioning mechanism includes a positioning base and multiple rows of mounting holes arrayed on the positioning base. Each mounting hole is internally provided with a cyclone clamping body. An air inlet pipeline communicating with each mounting hole is opened on the positioning base, and the air inlet pipeline is used for circulating compressed air; a porous diaphragm is fixed on the positioning base and fits on the cyclone clamping body; the cyclone clamping body includes a shaft sleeve hermetically installed in the mounting hole. A stepped hole communicating with the mounting hole is opened on the shaft sleeve. An air pressure core is rotatably installed in the stepped hole. An annular groove is opened on the air pressure core, and a circulation hole communicating the bottom of the stepped hole with the annular groove is opened on the air pressure core; a guide air head with a diameter larger than the large hole diameter of the stepped hole is arranged on the air pressure core, and a conical surface inclined towards one side of the stepped hole is arranged on the shaft sleeve; a pressure sensor is embedded on the shaft sleeve at the opening edge of the mounting hole, and an adjustment valve is connected to the inlet of the air inlet pipeline; a control unit is further included, which is used to adjust the opening degree of the adjustment valve according to the pressure detected by the pressure sensor so as to adjust the circulation amount of the compressed air in the air inlet pipeline.

[0008] Preferably, the circulation hole includes a diversion hole coaxial with the stepped hole and a plurality of diffuser holes penetrating the annular groove; the plurality of diffuser holes are arranged in a spiral pattern along the circumferential direction of the air pressure core.

[0009] Preferably, the conical surface includes a first air guiding surface and a second air guiding surface with different tapers. There is a transition connection structure between the first air guiding surface and the second air guiding surface. The taper of the first air guiding surface is greater than that of the second air guiding surface, and the first air guiding surface extends below the air guiding head.

[0010] Preferably, an air guiding inclined surface is provided at the end of the air guiding head close to the first air guiding surface.

[0011] Preferably, a convex ring portion protruding upward from the opening edge of the mounting hole is provided on the positioning base. An embedding hole is provided on the convex ring portion, and the air pressure sensor is embedded in the embedding hole.

[0012] Preferably, an electrical cavity is provided on the positioning base on one side of the inlet of the air inlet pipeline. A control unit is installed in the electrical cavity. A wiring groove communicating the electrical cavity and the embedding hole is provided on the positioning base; a sealing cover covering the electrical cavity is installed on the positioning base, and a connector is provided on the sealing cover.

[0013] Preferably, an installation groove for fixing the porous diaphragm is provided on the positioning base, and the porous diaphragm is attached to the upper surface of the convex ring portion.

[0014] Preferably, a plurality of assembly holes are provided in the middle of the positioning base.

[0015] Preferably, the thickness range of the air film layer formed above the porous diaphragm is 0.05 mm to 0.2 mm.

[0016] (III) Beneficial Effects

[0017] By providing a mounting hole communicating with the air inlet pipeline in the positioning base, installing a cyclone clamping body in the mounting hole, conducting air through the porous diaphragm attached to the cyclone clamping body, the compressed air enters the annular groove after passing through the air inlet pipeline, the stepped hole, and the circulation hole. During the flow of the compressed air, the air pressure core is driven to rotate in the shaft sleeve, and flows at high speed from the annular groove through the gap between the air guiding head and the conical surface. Under the guiding action of the conical surface, part of the compressed air swirls and flows towards the air pressure core side, thereby forming an air film layer with a negative pressure adsorption effect above the porous diaphragm. The fragile product with a thin-walled structure is adsorbed and positioned by the air film layer without contacting the porous diaphragm, thereby forming an air suspension state, which ensures that no clamping, damage, or scratches occur during the polishing and grinding process, and improves the polishing and grinding efficiency;

[0018] At the same time, after the fragile products with different shapes and sizes are clamped by air suspension, the control unit judges the adsorption force of the air film layer by obtaining the air pressure signal of the air pressure sensor, and adjusts the air flow rate of the compressed air in the air inlet pipeline through the control adjustment valve to adjust the adsorption force, so as to adapt to the stable adsorption of fragile products with different sizes and shapes. Description of the Drawings

[0019] Figure 1 Schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 Schematic structural diagram of disassembling a porous diaphragm according to an embodiment of the present invention;

[0021] Figure 3 Schematic cross-sectional structural diagram of an embodiment of the present invention;

[0022] Figure 4 Schematic structural diagram of a positioning base in an embodiment of the present invention;

[0023] Figure 5 Schematic structural diagram of a cyclone clamping body in an embodiment of the present invention;

[0024] Figure 6 Schematic structural diagram of a shaft sleeve in an embodiment of the present invention;

[0025] Figure 7 Schematic structural diagram of a hollow pressure core in an embodiment of the present invention;

[0026] In Figures 1 to 7 the correspondence between the component names or lines and the drawing reference numerals is as follows:

[0027] Positioning base 1, mounting hole 2, cyclone clamping body 3, shaft sleeve 31, stepped hole 32, hollow pressure core 33, annular groove 34, diversion hole 35, diffusing hole 36, conical surface 37, first air guiding surface 371, second air guiding surface 372, air guiding head 38, air guiding inclined surface 380, convex ring portion 39, air inlet pipeline 4, porous diaphragm 5, mounting groove 6, assembly hole 7, air pressure sensor 8, sealing cover 9, connector 10. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Refer to Figures 1 - 5As shown in the figure, in an embodiment of the present invention, a non-contact constant-pressure adsorption positioning mechanism is proposed, which is used to be installed in a polishing and grinding device to perform air suspension clamping on fragile products and cooperate with a polishing wheel for polishing and grinding processing. Specifically, it includes a positioning base 1 and multiple rows of mounting holes 2 arrayed on the positioning base 1. A cyclone clamping body 3 is installed in each mounting hole 2. An air inlet pipeline 4 communicating with each mounting hole 2 is provided on the positioning base 1. The air inlet pipeline 4 is used for the flow of compressed air. The compressed air is connected from an external air compressor to the air inlet pipeline 4. After passing through the cyclone clamping body 3, a layer of air film layer will be formed above, and the air film layer has an adsorption effect, so that the fragile products with thin-walled structures can be air-suspended and clamped, and a constant adsorption pressure can be maintained without changing the flow rate of the compressed air. At the same time, a porous diaphragm 5 attached to the cyclone clamping body 3 is fixed on the positioning base 1. The holes on the porous diaphragm 5 are used to divert the air flowing out of the cyclone clamping body 3 and can form a more uniform air film layer.

[0030] Specifically, as Figures 5 - 7 shown, the cyclone clamping body 3 includes a bushing 31 sealed and installed in the mounting hole 2. A stepped hole 32 communicating with the mounting hole 2 is provided on the bushing 31. An air pressure core 33 is rotatably installed in the stepped hole 32. The bottom contact part is kept sealed when the air pressure core 33 is rotatably connected. At the same time, an annular groove 34 is provided on the air pressure core 33. A flow hole communicating the bottom of the stepped hole 32 with the annular groove 34 is provided on the air pressure core 33. The flow hole is used to guide the compressed air entering the bushing 31 into the interior of the air pressure core 33 and then flow into the annular groove 34. Thus, the air pressure core 33 is driven to rotate relative to the bushing 31 by the power of the compressed air, and the compressed air also flows outwards in a rotating direction from the annular groove 34.

[0031] At the same time, a wind guiding head 38 with a diameter larger than the large hole diameter of the stepped hole 32 is provided on the air pressure core 33. A conical surface 37 inclined towards one side of the stepped hole 32 is provided on the bushing 31. A gap is formed between the wind guiding head 38 and the conical surface 37, thereby increasing the flow rate of the compressed air passing through the gap. The conical surface 37 is used to divert the direction of the compressed air. Therefore, after the compressed air flows towards the conical surface 37 in a rotating direction, under the guiding action of the conical surface 37, part of the compressed air flows back towards the side of the wind guiding head 38, forming a cyclone flow with a wind pressure applied towards the side of the wind guiding head 38. The cyclone flow is used to achieve air suspension adsorption of fragile products with thin-walled structures.

[0032] A pneumatic sensor 8 is embedded in the bushing 31 at the opening edge of the mounting hole 2. The inlet of the intake air pipeline 4 is connected with an adjusting valve. Meanwhile, a control unit is further included, which is used to adjust the opening degree of the adjusting valve according to the pressure detected by the pneumatic sensor 8 so as to adjust the flow rate of the compressed air in the intake air pipeline 4. Since different wind pressures need to be applied to fragile products with thin-walled structures of different sizes and shapes, in order to adapt to the stable adsorption after the change of the type of fragile products, the control unit collects the air pressure of the cyclone flow detected by the pneumatic sensor 8 and controls the opening degree of the adjusting valve to realize the adjustment of the flow rate of the compressed air in the intake air pipeline 4, so as to realize the adaptive adjustment of the adsorption pressure of the air film layer. Among them, the control unit is an integrated processor with the function of processing pneumatic signals and transmitting signals, and realizes the control of the opening degree of the adjusting valve through the linkage of the PLC control box in the external polishing and grinding equipment. Generally speaking, by controlling the flow rate of the compressed air, the thickness range of the air film layer formed above the porous diaphragm 5 can be changed from 0.05 mm to 0.2 mm, so as to ensure that there is at least a 0.05 mm air suspension gap and at most a 0.2 mm air suspension gap between the fragile product and the porous diaphragm 5 when the fragile product is adsorbed and pressed tightly.

[0033] Specifically, in order to ensure that the compressed air passing through the flow holes can drive the air pressure core 33 to rotate, the flow holes include a diversion hole 35 coaxial with the stepped hole 32 and a plurality of diffuser holes 36 penetrating the annular groove 34, and the plurality of diffuser holes 36 are arranged in a spiral shape along the circumferential direction of the air pressure core 33. Thus, the compressed air is shunted after passing through the diversion hole 35 and flows into the annular groove 34 through the spiral diffuser holes 36, and the air pressure core 33 is driven to rotate relative to the bushing 31 under the action of the air flow, and the compressed air flowing into the annular groove 34 has a rotational flow direction.

[0034] The conical surface 37 is used to guide the rotating compressed air to form a cyclone flow for part of the compressed air, and flow toward the air guide head 38 side to ensure the formation of the air film layer. Specifically, the conical surface 37 includes a first air guiding surface 371 and a second air guiding surface 372 with different taper angles. There is a transition connection structure between the first air guiding surface 371 and the second air guiding surface 372, and the transition connection structure is a fillet to avoid the formation of resistance when the compressed air flows through. The taper angle of the first air guiding surface 371 is greater than that of the second air guiding surface 372, and the first air guiding surface 371 extends below the air guide head 38. The compressed air with a rotational direction flowing out of the annular groove 34 flows toward the first air guiding surface 371 and the second air guiding surface 372 respectively. Among them, the compressed air passing through the second air guiding surface 372 has a larger return angle, while the compressed air passing through the first air guiding surface 371 accelerates and pushes the upper-layer compressed air, so that the speed of the cyclone flow is increased and a stable air film layer can be continuously maintained. The adsorption pressure is formed by the combined action of the compressed air blowing from below and the compressed air swirling above on the fragile product, and finally a stable air suspension state is achieved.

[0035] At the same time, an air guide slope 380 is provided at the end of the air guide head 38 close to the first air guide surface 371, and a gap for accelerating the flow of compressed air is formed between the air guide slope 380 and the first air guide surface 371. The air guide slope 380 can reduce the wind resistance formed at the end of the air guide head 38 during the flow of compressed air.

[0036] Specifically, a convex ring portion 39 protruding upward from the opening edge of the mounting hole 2 is provided on the positioning base 1, and an embedding hole is opened on the convex ring portion 39, and the air pressure sensor 8 is embedded in the embedding hole; the convex ring portion 39 is used to fit and position the porous diaphragm 5, and at the same time embed the air pressure sensor 8 to obtain more accurate air pressure parameters.

[0037] Specifically, an electrical cavity is opened on the positioning base 1 at one side of the entrance of the air intake pipe 4, and a control unit is installed in the electrical cavity. A wiring groove connecting the electrical cavity and the embedded hole is provided on the positioning base 1, and the wiring groove is used to lay the wires between the air pressure sensor 8 and the control unit. In addition, a sealing cover 9 covering the electrical cavity is installed on the positioning base 1, and a connector 10 is provided on the sealing cover 9. The connector 10 is used to connect and communicate with the PLC control box in the polishing and grinding equipment, and the adjustment valve can also be connected to the PLC control box through the connector 10.

[0038] In order to stably install the porous diaphragm 5 and allow the air film layer to be located above the porous diaphragm 5 so that fragile products are adsorbed without interference from the positioning base 1, a mounting groove 6 for fixing the porous diaphragm 5 is provided on the positioning base 1, and the porous diaphragm 5 is attached to the upper surface of the convex ring portion 39. Thus, the porous diaphragm 5 is installed and attached to the convex ring portion 39 through the mounting groove 6, so that the upper surface of the porous diaphragm 5 is flush with the positioning base 1, and the air film layer formed at the convex ring portion 39 is located above the upper surface of the entire positioning base 1.

[0039] Specifically, in order to facilitate the fixed installation of the positioning base 1 in the polishing and grinding equipment, a plurality of assembly holes 7 are opened in the middle of the positioning base 1, and the positioning base 1 is fixedly installed through the assembly holes 7.

[0040] If all the cyclone clamping bodies 3 on the positioning base 1 do not need to be put into use, it is possible to consider independently controlling the air inlet pipe 4 entering the MiG mounting hole 2 inside the positioning base 1, and further integrating the stop valve for on-off control. It should also be noted that the maximum size of the fragile product being clamped is less than the maximum size of the convex ring portion 39 + 10mm.

[0041] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0043] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A non-contact constant pressure adsorption and positioning mechanism, characterized in that: It includes a positioning base and multiple columns of mounting holes arrayed on the positioning base. A cyclone clamping body is installed in each mounting hole. An air inlet pipeline communicating with each mounting hole is opened on the positioning base, and the air inlet pipeline is used for flowing compressed air. A porous diaphragm that fits on the cyclone clamping body is fixed on the positioning base. The cyclone clamping body includes a bushing sealed and installed in the mounting hole. A stepped hole communicating with the mounting hole is opened on the bushing. An air pressure core is rotatably installed in the stepped hole. An annular groove is opened on the air pressure core, and a circulation hole communicating the bottom of the stepped hole with the annular groove is opened on the air pressure core. A wind guiding head with a diameter larger than the large hole diameter of the stepped hole is provided on the air pressure core, and a conical surface inclined towards one side of the stepped hole is provided on the bushing. A pressure sensor located at the opening edge of the mounting hole is embedded on the bushing, and an adjustment valve is connected to the inlet of the air inlet pipeline. It further includes a control unit for adjusting the opening degree of the adjustment valve according to the pressure detected by the pressure sensor to regulate the flow rate of the compressed air in the air inlet pipeline.

2. The non-contact constant pressure adsorption and positioning mechanism according to claim 1, characterized in that: The circulation hole includes a diversion hole coaxial with the stepped hole and multiple diffuser holes penetrating the annular groove. The multiple diffuser holes are arranged in a spiral pattern along the circumferential direction of the air pressure core.

3. A non-contact constant pressure adsorption and positioning mechanism according to claim 1, characterized in that: The conical surface includes a first air guiding surface and a second air guiding surface with different taper degrees. There is a transition connection structure between the first air guiding surface and the second air guiding surface. The taper degree of the first air guiding surface is greater than that of the second air guiding surface, and the first air guiding surface extends below the wind guiding head.

4. A non-contact constant pressure adsorption and positioning mechanism according to claim 3, characterized in that: A wind guiding inclined surface is provided at the end of the wind guiding head close to the first air guiding surface.

5. A non-contact constant pressure adsorption and positioning mechanism according to claim 1, characterized in that: A convex ring portion protruding upward from the opening edge of the mounting hole is provided on the positioning base. An embedding hole is opened on the convex ring portion, and the pressure sensor is embedded in the embedding hole.

6. A non-contact constant pressure adsorption and positioning mechanism according to claim 5, characterized in that: An electrical cavity is opened on the positioning base on one side of the inlet of the air inlet pipeline. The control unit is installed in the electrical cavity, and a wiring groove communicating the electrical cavity with the embedding hole is provided on the positioning base. A sealing cover covering the electrical cavity is installed on the positioning base, and a connector is provided on the sealing cover.

7. A non-contact constant pressure adsorption and positioning mechanism according to claim 5, characterized in that: An installation groove for fixing the porous diaphragm is provided on the positioning base, and the porous diaphragm fits on the upper surface of the convex ring portion.

8. A non-contact constant pressure adsorption and positioning mechanism according to any one of claims 1-7, characterized in that: Multiple assembly holes are opened in the middle of the positioning base.

9. A non-contact constant pressure adsorption and positioning mechanism according to claim 8, characterized in that: The thickness range of the air film layer formed above the porous diaphragm is 0.05 mm to 0.2 mm.

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