A ventilation closed-loop structure applied to a rotating motor shaft

Abstract

This utility model relates to a closed-loop ventilation structure for motor shaft rotation, belonging to the field of chip mounter technology. It includes a nozzle assembly, a motor assembly, and a sealing adapter. The sealing adapter has an air passage connected to an external air source and to the nozzle assembly. The sealing adapter also has a motor shaft hole to accommodate the shaft of the motor assembly. A closed-loop PCB is also mounted on the sealing adapter. A side air inlet is provided inside the sealing adapter, communicating with the motor shaft hole. A sealing assembly is also provided, housed in the sealing adapter, to seal the side air inlet and the motor shaft hole. The bearing of the motor assembly is a hollow rotating shaft with inlet and outlet air holes. This utility model has the advantages of stable airtightness under high-speed operation, simple assembly, stable and reliable performance, and ease of mass production.

Description

Technical Field

[0001] This utility model relates to a closed-loop air path structure for a pick-and-place machine, and more particularly to a closed-loop air passage structure for motor shaft rotation, belonging to the field of pick-and-place machine technology. Background Technology

[0002] Existing rotary electric motors are widely used in industrial automation, medical devices, and precision manufacturing, especially in the application of pick-and-place machines. The integrated design of closed-loop drive and ventilation functions is a key requirement for improving equipment performance. However, the ventilation and closed-loop drive structures of existing rotary electric motors suffer from the following technical bottlenecks:

[0003] 1. Conflict between Structural Integration and Functionality: Traditional rotating electric motors often employ a separate design for their ventilation system and closed-loop drive structure, such as using external air ducts and independent sealing components to achieve ventilation. This approach requires additional sealing cavities, connecting flanges, and other components, resulting in a bulky overall structure and high assembly complexity. Furthermore, the dynamic coupling design between the motor's rotating shaft and the air duct interface is insufficient, making it difficult to simultaneously meet the requirements of high-precision closed-loop control and stable air supply within a limited space, thus hindering the development of miniaturization and high-density integration of equipment.

[0004] 2. Modular maintainability and cost drawbacks: Existing motor systems often use an integrated design or fixed connection between the sealing adapter structure and the motor body. When the motor or sealing components fail, the entire system must be disassembled and key components replaced, resulting in long maintenance cycles and high spare parts costs. Especially for nozzle modules that are frequently replaced in high-precision equipment, the lack of a modular interface design for quick disassembly and assembly significantly reduces equipment maintenance efficiency and increases user downtime losses.

[0005] 3. Insufficient reliability of dynamic sealing: Traditional dynamic sealing solutions often rely on the combination of multi-stage mechanical seals (such as labyrinth seals and mechanical face seals), which increases the contact area between the rotating shaft and the sealing structure, exacerbating frictional losses and making it prone to air leakage or seal failure during long-term operation. At the same time, the existing sealing layout has weak protection against the intrusion of impurities in the nozzle's working environment. Moisture or particulate matter can easily seep into the closed-loop PCB area along the axial gap, causing circuit short circuits or sensor signal drift and other malfunctions.

[0006] 4. Limitations on gas path stability and supply efficiency: Conventional single-hole or straight-through gas path designs suffer from problems such as large airflow pulsation and uneven local pressure. Especially under high-speed rotation conditions, gas permeability is easily affected by shaft eccentric vibration. In addition, a single air inlet is prone to blockage by foreign objects, leading to gas supply interruption, which makes it difficult to meet the needs of precision equipment for a continuous and stable gas source, thus restricting the improvement of process repeatability and machining accuracy. Summary of the Invention

[0007] The technical problem to be solved by this utility model is to provide a closed-loop ventilation structure for motor shaft rotation that has a reasonable structural design, stable airtightness under high-speed operation, high efficiency in replacement and maintenance, simple assembly, stable and reliable performance, and is easy to mass-produce.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is a closed-loop ventilation structure for motor shaft rotation, which includes the following components:

[0009] A nozzle assembly, which is a direct working component of the pick-and-place machine;

[0010] A motor assembly, which is connected to the nozzle assembly and is used to control the movement of the nozzle assembly;

[0011] A sealing adapter is provided above the motor assembly. An air passage is provided inside the sealing adapter. The air passage is connected to an external air source and is connected to the suction nozzle assembly below. The sealing adapter is also provided with a motor shaft hole for accommodating the shaft of the motor assembly. A closed-loop PCB is also provided on the sealing adapter.

[0012] Its structural features are as follows:

[0013] A side air intake is provided inside the sealed adapter, and the side air intake is connected to the motor shaft hole;

[0014] A sealing assembly is also provided, which is disposed in the sealing adapter seat and is used to seal the side air intake and the motor shaft hole;

[0015] The bearing of the motor assembly is a hollow rotating shaft, and air inlet and outlet holes are provided on the hollow rotating shaft.

[0016] As a further preferred embodiment, the present invention also provides a side air passage within the sealing connection seat. The side air passage is connected to the air inlet and outlet holes of the hollow rotating shaft. The side air passage opens into the outer shell of the sealing connection seat, and a sealing plug is provided at the opening.

[0017] As a further preferred embodiment, the sealing assembly of this invention includes a sealing gasket, an O-ring, and a U-ring. The sealing gasket is disposed below the closed-loop PCB, and the O-ring and U-ring are disposed in the motor shaft hole. The O-ring is disposed above the upper horizontal position of the side air passage, and the U-ring is disposed below the upper horizontal position of the side air passage.

[0018] As a further preferred embodiment, the present invention provides an O-ring mounting groove, a U-ring mounting groove, a sealing plug mounting hole, a gasket mounting surface, and a closed-loop PCB mounting surface in the sealing adapter, respectively, for mounting the O-ring, U-ring, sealing plug, gasket, and closed-loop PCB.

[0019] As a further preferred embodiment, the closed-loop PCB and the sealing gasket are fixedly installed in the sealing adapter using closed-loop PCB fixing screws, and the sealing adapter is fixedly installed on the motor assembly using sealing adapter fixing screws.

[0020] As a further preferred embodiment, the present invention provides a radial magnet above the hollow rotating shaft, and the radial magnet is disposed within the radial magnet fixing surface in the sealed adapter.

[0021] As a further preferred embodiment, the sealing adapter of this utility model is provided with an air pipe connector, and an air pipe is connected to the air pipe connector, and the air pipe is connected to an external air source.

[0022] Compared with the prior art, this utility model has the following advantages and effects:

[0023] 1. Simple and compact structure. It can achieve closed-loop drive of the motor while allowing air to pass through and rotation to occur simultaneously.

[0024] 2. Simple production and after-sales service. The two motor parts and the sealed adapter part can be assembled or replaced separately as modules. This not only results in high efficiency but also low cost.

[0025] 3. High structural stability and reliability. The only dynamic contact between the motor and the sealing adapter is between the rotating shaft and the O-ring and U-ring seals. Simultaneously, the O-ring seals effectively prevent the nozzle from accidentally drawing in impurities or moisture, which could then contact the closed-loop PCB and cause damage.

[0026] 4. Improved stability of air intake and exhaust at the nozzle. Multiple air inlet and outlet holes on the motor shaft ensure a stable and continuous air supply. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an exploded view of the overall structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the side structure of the sealing adapter of this utility model;

[0030] Figure 3 This is a top view of the sealing adapter of this utility model.

[0031] Figure 4 This is a schematic diagram of the motor assembly of this utility model;

[0032] Figure 5 This is a schematic diagram of the air path of this utility model;

[0033] Figure 6 This is an assembly diagram of the present invention;

[0034] Figure 7 This is a schematic diagram of the overall structure of this utility model.

[0035] Labeling Explanation: Nozzle Assembly 1, Motor Assembly 2, Sealing Plug 3, Sealing Gasket 4, Closed-Loop PCB 5, Air Tube Connector 6, Air Tube 7, Sealing Adapter 8, Closed-Loop PCB Fixing Screw 51, Sealing Adapter Fixing Screw 81, O-ring 82, U-ring 83, Radial Magnet 9, O-ring Mounting Groove 821, U-ring Mounting Groove 831, Sealing Plug Mounting Hole 31, Motor Shaft Hole 32, Sealing Gasket Mounting Surface 34, Closed-Loop PCB Mounting Surface 35, Air Tube Connector Fixing Hole 36, Side Air Inlet 37, Side Air Inlet 38, Through Hole 351, Closed-Loop PCB Fixing Screw Hole 352, Nozzle Mounting End 21, Hollow Rotating Shaft 22, Air Inlet / Outlet Hole 23, Radial Magnet Fixing Surface 29, Sealing Adapter Fixing Screw Hole 281. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0037] like Figure 1-7 As shown in the figure, this utility model embodiment provides a closed-loop ventilation structure for motor shaft rotation, the specific structure of which is as follows:

[0038] Nozzle assembly 1: The nozzle assembly 1 is a direct working component of the pick-and-place machine. It is fixedly connected to the lower end of the hollow rotating shaft 22 of the motor assembly 2 via the nozzle mounting end 21, and is used to adsorb or release electronic components.

[0039] Motor assembly 2: The motor assembly 2 includes a hollow rotating shaft 22, the interior of which is a through air chamber, and multiple air inlet and outlet holes 23 are evenly opened circumferentially above the shaft body; the upper end of the hollow rotating shaft 22 is connected to a radial magnet 9, which is fixed in the radial magnet fixing surface 29 of the sealing adapter 8, and is used to cooperate with the closed-loop PCB5 to realize closed-loop feedback of motor position.

[0040] Sealing adapter 8: The sealing adapter 8 is mounted on top of the motor assembly 2 via sealing adapter fixing screws 81, and its internal structure includes the following:

[0041] Motor shaft hole 32: passes through the center of the sealed adapter 8 and is connected to the side air inlet 37 through the side air inlet 38, and is used to accommodate the hollow rotating shaft 22;

[0042] Side air intake 37: Located in the sealed adapter 8, the side wall extends to communicate with the motor shaft hole 32 through the side air passage 38, and the upper end is connected to the external air source;

[0043] Side air passage 38: connects the side air inlet passage 37 and the motor shaft hole, and is positioned opposite to the air inlet and outlet holes 23 of the hollow rotating shaft 22. The end of the side air passage 38 opens into the housing of the sealing adapter 8 and is sealed by the sealing plug 3.

[0044] 6. Air tube connector: Installed above the sealing adapter 8 through the air tube connector fixing hole 36, and connected to the air tube 7 to introduce an external air source.

[0045] Sealing assembly: includes the following components:

[0046] O-ring 82: Installed in the O-ring mounting groove 821, in the motor shaft hole 32 above the horizontal position of the side air passage 38, to isolate the air passage from the closed-loop PCB5 area;

[0047] U-shaped sealing ring 83: Installed in the U-shaped sealing ring mounting groove 831, in the motor shaft hole 32 located below the horizontal position of the side air passage 38, for dynamically sealing the gap between the hollow rotating shaft 22 and the motor shaft hole 32;

[0048] Sealing gasket 4: It is installed on the sealing gasket mounting surface 34. The closed-loop PCB fixing screw 51 passes through the closed-loop PCB fixing screw hole 352 and is pressed together with the closed-loop PCB 5 to prevent gas from seeping into the electrical components.

[0049] Closed-loop PCB5: Mounted on the mounting surface 35 of the closed-loop PCB, it is fixed by the screw hole 281 of the sealing adapter fixing seat and the fixing screw 81 of the sealing adapter fixing seat through the through hole 351. The closed-loop PCB5 has a built-in sensor to detect the magnetic field change of the radial magnet 9 and realize the closed-loop control of the motor position.

[0050] Further optimization of the structure:

[0051] The sealing adapter 8 is also provided with a sealing plug mounting hole 31 for installing the sealing plug 3 to close the end of the air passage 38 on the side.

[0052] The air inlet and outlet holes 23 of the hollow rotating shaft 22 are arranged in a spiral array or horizontally, generally 2-4 in number, with a hole diameter of 0.3-0.8 mm, forming a continuous airflow passage with the side air passage 38;

[0053] The radial magnet 9 is a multi-pole magnetized ring magnet, and the distance between it and the sensor element of the closed-loop PCB5 should not be too far to ensure high-precision position signal acquisition.

[0054] The sealing adapter fixing screw 81 passes through the sealing adapter fixing screw hole 281 to lock the sealing adapter 8 and the motor assembly 2, and the assembly gap is controlled within 0.05mm.

[0055] Working principle:

[0056] External air enters the side air inlet 37 through the air pipe 7 and the air pipe connector 6, and is delivered to the air inlet and outlet holes 23 of the hollow rotating shaft 22 through the side air inlet 38. Finally, it is output from the nozzle assembly 1, forming positive or negative pressure, thereby realizing the suction and release of the nozzle. When the motor assembly 2 drives the hollow rotating shaft 22 to rotate, the closed-loop PCB5 monitors the position of the radial magnet 9 in real time and adjusts the motor speed and direction. At the same time, the O-ring seal 82 and the U-ring seal 83 work together to ensure airtightness and prevent external pollutants from entering the closed-loop PCB5 area.

[0057] The primary purpose of the side air passage 38 in this invention is to facilitate processing. Secondly, it serves a certain maintenance function; for example, if small components are sucked into the interior, an air gun can be used to blow out the side air passage 38.

[0058] Furthermore, it should be noted that the shapes and names of the parts and components described in the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A closed-loop ventilation structure for motor shaft rotation, comprising the following components: A nozzle assembly, which is a direct working component of the pick-and-place machine; A motor assembly, which is connected to the nozzle assembly and is used to control the movement of the nozzle assembly; A sealing adapter is provided above the motor assembly. An air passage is provided inside the sealing adapter. The air passage is connected to an external air source and is connected to the suction nozzle assembly below. The sealing adapter is also provided with a motor shaft hole for accommodating the shaft of the motor assembly. A closed-loop PCB is also provided on the sealing adapter. Its features are: A side air intake is provided inside the sealed adapter, and the side air intake is connected to the motor shaft hole; A sealing assembly is also provided, which is disposed in the sealing adapter seat and is used to seal the side air intake and the motor shaft hole; The bearing of the motor assembly is a hollow rotating shaft, and air inlet and outlet holes are provided on the hollow rotating shaft.

2. The closed-loop ventilation structure for motor shaft rotation according to claim 1, characterized in that: in The sealing adapter is also provided with a side air passage. The side air passage is connected to the air inlet and outlet of the hollow rotating shaft through the side air passage. The side air passage opens into the outer shell of the sealing adapter, and a sealing plug is provided at the opening.

3. The closed-loop ventilation structure for motor shaft rotation according to claim 2, characterized in that: The sealing assembly includes a sealing gasket, an O-ring, and a U-ring. The sealing gasket is disposed below the closed-loop PCB. The O-ring and U-ring are disposed in the motor shaft hole. The O-ring is disposed above the upper level position of the side air passage, and the U-ring is disposed below the upper level position of the side air passage.

4. The closed-loop ventilation structure for motor shaft rotation according to claim 3, characterized in that: in The sealing adapter is provided with an O-ring mounting groove, a U-ring mounting groove, a sealing plug mounting hole, a gasket mounting surface, and a closed-loop PCB mounting surface, respectively, for mounting the O-ring, U-ring, sealing plug, gasket, and closed-loop PCB.

5. The closed-loop ventilation structure for motor shaft rotation according to claim 4, characterized in that: The closed-loop PCB and the sealing gasket are fixedly installed in the sealing adapter using closed-loop PCB fixing screws, and the sealing adapter is fixedly installed on the motor assembly using sealing adapter fixing screws.

6. A closed-loop ventilation structure for motor shaft rotation according to any one of claims 1, 2, 3, 4, and 5, characterized in that: A radial magnet is provided above the hollow rotating shaft, and the radial magnet is located within the radial magnet fixing surface in the sealed adapter.

7. A closed-loop ventilation structure for motor shaft rotation according to claim 6, characterized in that: The sealing adapter is provided with an air pipe connector, and an air pipe is connected to the air pipe connector, which is connected to an external air source.

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