A rotating hook oil supply circulation loop, rotating hook assembly, and sewing apparatus

Abstract

The utility model discloses a kind of spin shuttle oil supply circulation loop, spin shuttle assembly and sewing equipment, including electronic oil pump, oil supply nozzle, oil return nozzle, oil supply pipe and oil return pipe;Electronic oil pump is as independent oil supply source, is communicated with spin shuttle respectively through oil supply nozzle and oil return nozzle, oil supply nozzle passage cross-sectional area is greater than oil return nozzle, cross-sectional difference is 0.1~1mm square;Stable oil pressure is established by controlling electronic oil pump speed and oil nozzle cross-sectional difference, realize indirect spin shuttle precision oil supply;System combines speed and oil film consumption algorithm to adjust oil supply opportunity and oil quantity, keep spin shuttle lubrication stable, reduce lubricating oil throw and fabric pollution;The scheme realizes spin shuttle oil supply independent control and electric control adjustable, improve the oil supply fluctuation problem of traditional mechanical oil pump affected by main shaft speed, improve spin shuttle operation reliability and service life, with the advantages of simple structure, easy to adjust and strong universality.

Description

Technical Field

[0001] This utility model belongs to the field of rotary hook oil supply for lock sewing machines, specifically relating to a rotary hook oil supply circulation circuit, a rotary hook assembly, and a sewing device. Background Technology

[0002] The rotary hook is an important component of the sewing machine's thread-hooking mechanism. During operation, the rotary hook rotates at high speed. Because the rotary hook is composed of an outer and an inner shuttle frame, the inner shuttle frame remains stationary relative to the outer shuttle frame during sewing, while the outer shuttle frame rotates at high speed along with the lower shaft. The inner and outer shuttle frames are connected by guide rails, where high-speed sliding friction occurs, reaching speeds of up to 10,000 revolutions per minute. Therefore, stable lubrication is required at the rotary hook guide rail position to ensure the normal operation of the rotary hook.

[0003] In existing sewing equipment, the lubrication of the rotary hook mainly relies on a mechanical oil pump system driven by the main shaft. This structure binds the oil pump speed to the sewing main shaft speed. Under different sewing speeds, the oil supply of the rotary hook changes linearly, resulting in significant fluctuations in oil volume depending on the working conditions. Under high-speed conditions, excessive oil volume in the rotary hook causes lubricating oil to be thrown out and contaminate the fabric. Under low-speed conditions, insufficient oil supply can cause the rotary hook to overheat, wear, or make abnormal noises, affecting the equipment's lifespan and sewing quality. In addition, traditional oil circuits typically use screws or valves to fine-tune the oil volume, which has problems of lag and complex operation. It is difficult to adjust quickly and consistently in mass production, and the stability of the oil volume is greatly affected by mechanical wear and environmental factors.

[0004] With users demanding higher quality in garment processing and OEMs raising their requirements for equipment quality, the original oil supply system can no longer meet technical needs. Utility Model Content

[0005] To solve the above problems, this utility model proposes a rotary hook oil supply circulation loop, which decouples the oil supply from the spindle speed by using an electronic oil pump as an independent oil supply source; the system controls the oil pressure by the difference in cross-section between the oil supply nozzle and the return nozzle, and achieves indirect oil supply by combining an electronic control algorithm, thereby maintaining the stability of rotary hook lubrication at different sewing speeds.

[0006] A rotary hook oil supply circulation circuit includes an electronic oil pump, an oil supply nozzle, an oil return nozzle, an oil supply pipe, and an oil return pipe. The electronic oil pump is an independent oil supply source and is connected to the oil supply pipe and the oil return pipe respectively.

[0007] The oil supply pipe supplies oil to the rotary hook through the oil supply nozzle, and the oil return pipe returns the oil to the electronic oil pump through the oil return nozzle;

[0008] Among them, the cross-sectional area of ​​the oil supply nozzle is larger than that of the oil return nozzle, and the difference between the cross-sectional areas of the two is 0.1 to 1 mm².

[0009] The electronic oil pump operates independently of the spindle speed of the sewing machine. The speed of the electronic oil pump is adjusted by the sewing machine control system to supply oil independently to the rotary hook.

[0010] The technical solution provided in this application also has the following technical features:

[0011] Preferably, in one embodiment of this application, the channel cross-section of the oil supply nozzle is circular; the channel cross-section of the oil return nozzle is circular.

[0012] Preferably, in one embodiment of this application, the electronic oil pump is equipped with a controller for matching the oil supply to the rotary hook under operating conditions; the controller is connected to a sensor for obtaining the rotary hook speed parameters and controlling the electronic oil pump to start and stop the oil supply according to a preset formula.

[0013] Preferably, in one embodiment of this application, the controller has a built-in oil film consumption model unit, which divides the oil film working condition and oil sludge requirement working condition of the rotary hook into consumption working condition and lubrication working condition, and dynamically supplies oil in a cycle according to the operating time period of consumption working condition and lubrication working condition.

[0014] Preferably, in one embodiment of this application, the oil supply nozzle and the oil return nozzle are detachable structures.

[0015] Preferably, in one embodiment of this application, the electronic oil pump and controller are an integrated module, which is connected to the sewing machine control system via a bus interface for unified speed regulation and data acquisition.

[0016] Preferably, in one embodiment of this application, the sewing machine control system includes a solenoid valve assembly, which controls the oil circuit to open or close when the controller sends an on / off signal, thereby completing the start and stop of oil supply.

[0017] Preferably, in one embodiment of this application, the sewing machine control system is provided with a rotary hook temperature sensor or a rotary hook vibration sensor to obtain the oil supply condition.

[0018] Preferably, in one embodiment of this application, a rotary hook assembly includes the aforementioned rotary hook oil supply circulation loop.

[0019] Preferably, in one embodiment of this application, a sewing device includes the aforementioned rotary hook assembly.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0021] This application utilizes an electronic pump for independent oil supply and employs channels with different cross-sectional areas to achieve differential pressure control of oil supply and return. This technical solution achieves the following technological advancements:

[0022] 1. To solve the problems of oil pump being tied to the main shaft in traditional rotary hook oil supply systems, resulting in unstable oil supply, insufficient rotary hook lubrication, and fabric contamination due to changes in oil supply with sewing speed, an independent electronic oil pump drive structure design is adopted. The oil pump speed is adjusted by electronic control to achieve decoupling from the main shaft speed, overcoming the problem of uneven oil supply caused by fluctuations in working conditions of mechanical oil pumps. This achieves the technical effects of stable rotary hook oil supply, controllable oil pressure, and improved operational reliability.

[0023] 2. To solve the problems of traditional oil quantity adjustment relying on mechanical screws, slow response and poor adjustment consistency, a fixed cross-sectional difference of 0.1 to 1 mm² between the oil supply nozzle and the oil return nozzle is adopted. Combined with digital parameter control and preset calculation unit to complete the calculation, automatic speed adjustment forms oil pressure difference control mode, which overcomes the defects of mechanical adjustment lag and poor batch consistency, and achieves the technical effect of precise oil quantity adjustment, rapid response and high batch stability.

[0024] 3. To address the issues of significant differences in oil film consumption and inaccurate lubrication control at different sewing speeds, a feasible hardware implementation path for digital oil supply is provided. This path, combined with the present application, enables precise digital oil supply control based on target control requirements, such as oil contamination control and lubrication control, thus meeting the digital adjustment needs for precise automated oil supply. For example, an algorithm compensation mechanism based on dividing oil film consumption levels according to the rotary hook speed is adopted. By calculating the oil supply quantity K in real time and automatically starting and stopping the oil supply, the shortcomings of traditional systems in dynamically compensating for oil consumption are overcome, meeting the technical requirements of intelligent oil supply, balanced lubrication, and reduced rotary hook temperature rise.

[0025] 4. To address the problem of excessive lubricating oil spillage and fabric contamination during long-term operation of rotary hooks, a feasible hardware implementation path for digital oil supply is proposed. By adopting indirect micro-oil lubrication control logic and multi-level lubrication coefficient adjustment mechanism, the defects of oil contamination caused by traditional continuous oil supply are overcome, thus meeting the technical requirements of sufficient rotary hook lubrication, controllable oil quantity, significant reduction in fabric contamination, and saving oil consumption.

[0026] 5. To address the issues of poor adaptability and complex maintenance in existing oil circuit systems, a detachable and replaceable oil nozzle and modular electronic oil pump control unit structure are adopted. This overcomes the shortcomings of traditional oil circuit structures, which are fixed and cannot be quickly matched with different sewing machines, and achieves the technical effects of high system versatility, easy maintenance, and improved assembly efficiency. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This utility model provides a three-dimensional rotary hook oil supply circulation circuit. Figure 1 ;

[0029] Figure 2 This utility model provides a three-dimensional rotary hook oil supply circulation circuit. Figure 2 ;

[0030] Figure 3 This is a top view of a rotary hook oil supply circulation circuit according to the present invention;

[0031] Figure 4 for Figure 3 AA section view;

[0032] Components in the diagram:

[0033] 1. Electronic oil pump

[0034] 2. Oil supply nozzle

[0035] 3. Oil return nozzle

[0036] 4. Oil supply pipe

[0037] 5. Oil return pipe. Detailed Implementation

[0038] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings. These embodiments are only for illustrating this application and are not intended to limit the scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In traditional mechanical oil pump systems, the pump speed is synchronized with the spindle speed, resulting in insufficient oil supply at low speeds and excessive oil supply at high speeds. In addition, the mechanical adjustment structure has a sluggish response and poor batch consistency.

[0043] To address the problems in traditional sewing equipment where the rotary hook oil supply system is dependent on the main shaft drive, resulting in unstable oil supply volume due to fluctuations in rotational speed, insufficient lubrication, or excessive oil causing fabric contamination, this application provides a rotary hook oil supply circulation loop structure driven independently by an electronic oil pump. This solution achieves precise oil supply and return control of the rotary hook through an independent electronic oil pump, breaking the structural limitations of the traditional mechanical oil pump being tied to the main shaft speed. This allows the oil supply volume to be fully adjusted on demand by the electronic control system, thereby achieving stable lubrication under different sewing speeds and working conditions.

[0044] This solution uses an electronic oil pump as an independent power source, and the speed is independently adjusted through an electronic control system to achieve decoupling between oil supply and spindle speed;

[0045] This scheme sets a fixed cross-sectional difference of 0.1 to 1 mm² between the oil supply nozzle and the oil return nozzle to form a stable oil pressure difference;

[0046] This solution can combine electronic control algorithms to calculate the lubrication requirements of the rotary hook in real time, and adjust the oil pump speed according to sewing speed and oil film consumption data to achieve intermittent or continuous micro-oil lubrication.

[0047] The closed-loop system of the oil supply and return pipes in this design allows the lubricating oil to flow back to the electronic oil pump for reuse.

[0048] like Figures 1-4 A rotary hook oil supply circulation circuit includes an electronic oil pump 1, an oil supply nozzle 2, an oil return nozzle 3, an oil supply pipe 4, and an oil return pipe 5. The electronic oil pump 1 is used to supply oil to and return oil to the rotary hook, and the electronic oil pump 1 is an independent oil supply source. The operating conditions of the electronic oil pump 1 are set independently and are not bound to the spindle speed of the sewing equipment. Instead, it can be set independently to achieve the target oil supply, so as to accurately meet the operating conditions of the rotary hook and the sewing target requirements. The electronic oil pump is separated from the spindle, and the oil supply system operates independently, which is not affected by the fluctuation of the sewing speed, thus improving the stability of the oil supply.

[0049] The electronic oil pump 1 is connected to the oil supply pipe 4 and the oil return pipe 5;

[0050] Oil supply pipe 4 supplies oil to the rotary hook through oil supply nozzle 2, and oil return pipe 5 returns oil to the electronic oil pump 1 through oil return nozzle 3. The cross-sectional area of ​​the channel of oil supply nozzle 2 is larger than that of the channel of oil return nozzle 3, and the difference in channel cross-sectional area is 0.1 to 1 mm². The oil supply nozzle and the oil return nozzle form a micro-differential cross-sectional structure, and a constant oil pressure gradient is formed in the oil circuit to achieve stable establishment of the oil film of the rotary hook.

[0051] The working state of the electronic oil pump 1 is independent of the spindle speed of the sewing machine. The speed of the electronic oil pump 1 is adjusted by the sewing machine control system to independently supply oil to the rotary hook. Through the preset calculation relationship between speed, time and oil film consumption, the controller dynamically compensates the oil supply to keep the rotary hook in the best lubrication state at all times.

[0052] When implementing this application, the key points are as follows: the electronic oil pump 1 is installed as an independent oil supply source in the internal or external oil circuit module of the sewing machine, and the sewing machine control system is connected to its motor drive end; one end of the oil supply pipe 4 is connected to the outlet of the electronic oil pump, and the other end is guided to the lubrication point of the rotary hook through the oil supply nozzle 2; the return oil pipe 5 is connected to the inlet of the electronic oil pump through the return oil nozzle 3 to form a closed-loop oil circuit; the cross-sectional ratio of the oil supply nozzle and the return oil nozzle is controlled within a specific range, with a difference of 0.1 to 1 mm², to ensure stable oil pressure when the oil pump is running and to prevent oil stagnation or backflow;

[0053] The working process of this application is as follows: When the sewing equipment is started, the electronic control system determines the working status based on the rotary hook speed signal and calculates the oil film consumption rate. When the rotary hook speed is at any operating gear (F to J gear), the control system determines the corresponding oil demand based on the preset model, adjusts the speed output of the electronic oil pump, so that the oil sprayed from the oil supply nozzle forms a uniform oil film on the rotary hook guide rail;

[0054] After lubricating the rotary hook, the oil returns to the electronic oil pump through the return nozzle and return pipe, completing one cycle.

[0055] When the rotary hook stops or the oil film thickness reaches the target value, the control system stops the electronic oil pump; when the oil film thickness is detected to be below the threshold or the speed increases, the electronic oil pump is restarted to provide intermittent oil supply, thereby achieving dynamic closed-loop control.

[0056] Specifically, in one embodiment of this application, the channel cross-section of the oil supply nozzle 2 is circular; the channel cross-section of the oil return nozzle 3 is circular. In order to solve the problems of uneven oil flow, large pressure fluctuation and unstable oil film establishment in traditional rotary hook lubrication systems, the oil supply nozzle 2 and the oil return nozzle 3 are designed to have circular channel structures, so that the oil flow maintains a stable streamlined path during the entry and return process, reducing turbulence and local pressure loss, thereby ensuring the controllability and consistency of oil supply and return flow, and achieving the technical effects of stable oil pressure, continuous oil film and uniform lubrication.

[0057] Furthermore, the circular channel can also be replaced with an elliptical or tapered channel with an equivalent flow area, and the same flow resistance and oil pressure control effect can be achieved by adjusting the channel length and inlet angle.

[0058] Specifically, in one embodiment of this application, the electronic oil pump 1 is equipped with a controller for matching the oil supply to the rotary hook under different operating conditions; the controller is connected to a sensor to obtain the rotary hook speed parameters and control the electronic oil pump 1 to start and stop the oil supply according to a preset formula; the controller has a built-in oil film consumption model unit to divide the rotary hook's oil film condition and oil sludge requirement condition into consumption condition and lubrication condition, and dynamically supplies oil in a cyclical manner according to the operating time of consumption condition and lubrication condition.

[0059] To address the issues of delayed oil supply, uneven oil film maintenance, and oil sludge buildup caused by excessive oil supply in traditional rotary hook lubrication systems, an intelligent matching control feature between the electronic oil pump 1 and the controller is adopted. The rotary hook speed and load parameters are collected in real time by sensors. Based on the oil film consumption model unit built into the controller, the lubrication status of the rotary hook is dynamically identified, and the operating status is divided into two stages: consumption condition and lubrication condition. The timing and flow parameters for oil supply start and stop are set for each stage, realizing closed-loop control of the electronic oil pump 1. This overcomes the shortcomings of traditional mechanical linkage oil supply, which cannot automatically adjust with changes in operating conditions, and achieves the technical effects of precise oil supply, stable oil film, and reduced oil sludge buildup.

[0060] Furthermore, the sensor can be a Hall speed sensor, a photoelectric encoder, or a pressure feedback detection element, and the controller can be an MCU or FPGA architecture. As long as it can realize the dynamic control of the oil film based on the shuttle operation signal, the technical solution of this application can be realized.

[0061] Specifically, in one embodiment of this application, the oil supply nozzle 2 and the oil return nozzle 3 are detachable structures. The oil supply nozzle 2 and the oil return nozzle 3 and their connected oil supply pipe 4 and oil return pipe 5 are detachable and can be replaced independently to meet different rotary hook oil supply needs and different sewing equipment needs.

[0062] To address the challenges of diverse sewing and lubrication conditions in traditional rotary hook oil supply systems, which make oil supply control difficult, and to improve oil supply control to accommodate these diverse needs, the system employs a detachable oil supply nozzle (2) and return nozzle (3), with independent and detachable connections to the oil supply pipe (4) and return pipe (5). This allows the nozzles to be freely replaced according to the rotary hook size, oil volume requirements, or equipment model, overcoming the shortcomings of fixed nozzle structures in terms of poor versatility and insufficient adjustment flexibility. The system achieves adjustable rotary hook oil supply, high system versatility, and convenient maintenance and replacement. It is essential to ensure a good seal at the detached connections to prevent oil leakage, which can be achieved through threaded connections, quick-connect fittings, or snap-fit ​​interfaces.

[0063] Specifically, in one embodiment of this application, the electronic oil pump 1 and the controller are an integrated module, which is connected to the sewing machine control system through a bus interface for unified speed regulation and data acquisition; the sewing machine control system includes a solenoid valve assembly, which controls the oil circuit to open or close when the controller sends an on / off signal, thereby completing the start and stop of oil supply; the sewing machine control system is equipped with a rotary hook temperature sensor or a rotary hook vibration sensor to obtain the oil supply conditions.

[0064] To address the diverse oil supply methods and multiple spindle speeds associated with traditional rotary hook oil supply systems, this application adopts an integrated module combining an electronic oil pump 1 and a controller, connected to the sewing machine control system via a bus interface. This allows for applicability to various sewing equipment, meeting diverse needs and offering good compatibility. This application enables unified management of oil supply speed regulation and data acquisition. Simultaneously, the sewing machine control system is equipped with a solenoid valve assembly, rapidly controlling the oil circuit's start and stop based on on / off signals from the controller. Combined with real-time data acquisition of operating conditions using a rotary hook temperature sensor or vibration sensor, closed-loop intelligent oil supply is achieved. This overcomes the shortcomings of traditional systems, such as lag in adjustment, unstable oil film maintenance, and insufficient lubrication, achieving rapid oil supply response, uniform and stable oil film, reliable rotary hook lubrication, and adaptability to different sewing conditions. The control module can employ an independent MCU or FPGA system, with a bus interface of CAN, RS485, or Ethernet. As long as data acquisition, closed-loop control, and oil circuit on / off functions are achieved, the technical effects of this application can be realized.

[0065] Specifically, in one embodiment of this application, the rotary hook assembly includes a rotary hook oil supply circulation loop. The electronic oil pump 1, oil supply nozzle 2, oil return nozzle 3, and controller are integrated into the rotary hook assembly. The oil supply is adjusted in real time according to the rotary hook speed and operating conditions by the electronic control system, and intermittent precise oil supply is achieved by combining a closed-loop oil film consumption model. This overcomes the defects of traditional rotary hooks that rely on the main shaft for mechanical oil supply, unstable oil film maintenance, and adjustment lag. It achieves the technical effects of uniform rotary hook lubrication, continuous and stable oil film, extended rotary hook life, and reduced fabric contamination. The rotary hook assembly can be adapted to different models or specifications of sewing machine rotary hooks. As long as the oil supply circulation loop and closed-loop control function remain unchanged, the same technical effects can be achieved.

[0066] Specifically, in one embodiment of this application, the sewing equipment includes a rotary hook oil supply circulation loop, integrating an electronic oil pump 1, an oil supply nozzle 2, an oil return nozzle 3, and a controller into the equipment. The oil supply is adjusted in real time through an electronic control system, and the working condition of the rotary hook is monitored in a closed loop by a rotary hook temperature or vibration sensor, thereby achieving intermittent and precise oil supply. This overcomes the defects of traditional mechanical oil pumps that are tied to the main shaft, resulting in unstable oil volume, delayed adjustment, and poor versatility. It achieves the technical effects of uniform rotary hook lubrication, continuous and stable oil film, reduced fabric contamination, strong equipment adaptability, and simple maintenance, solving the problems of unstable rotary hook lubrication, insufficient oil film, or excessive oil volume leading to fabric contamination in traditional sewing equipment.

[0067] Specifically, in one embodiment of this application, the original oil supply system hardware is optimized by separating the oil pump power and the main shaft. The advantages of this are: firstly, an independent oil supply source eliminates the influence of actual sewing conditions on the oil supply of the rotary hook under the original oil circuit architecture; secondly, the user's on-site working conditions are constantly changing and uncontrollable; the oil supply of the rotary hook can differ by tens of times between high-speed and low-speed sewing conditions; for example, in special working scenarios: long-term high-speed operation can cause lubricating oil to contaminate the fabric, while long-term low-speed operation can cause insufficient oil supply to the rotary hook, resulting in abnormal noise and reduced lifespan. By separating the power source of the oil pump, the above problems can be solved, and the oil pump speed can be matched according to the actual situation of the oil circuit, no longer affected by sewing conditions; this greatly improves the oil supply stability of the rotary hook.

[0068] Fabric contamination can be addressed by indirectly supplying oil to the rotary hook via electronic control. The sewing industry has long relied on experience regarding rotary hook oil volume. When the rotary hook is running at 3800 rpm, the width of the oil output on the oiling paper needs to be controlled within 1-2 mm (within 5 seconds). However, traditional oil volume adjustment suffers from a lag, making it difficult to achieve quickly in mass production. Now, the oil circuit has been adjusted by removing the original oil volume adjustment screw and replacing it with a suitable small-hole return oil connector. The difference in cross-section between the return oil nozzle and the supply oil nozzle is controlled within 0.1-1 mm². Once the oil pump starts and reaches the specified speed, a certain oil pressure difference is generated in the oil circuit to begin supplying oil to the rotary hook. Fine-tuning the speed on the electronic control panel during production can compensate for the oil volume fluctuations during the supply phase, thus achieving stable oil supply to the rotary hook and achieving a level of stability in oil volume fluctuation that traditional oil supply methods cannot achieve.

[0069] After a stable oil supply to the rotary hook, a sustainable lubricating oil film will form on the hook guide rail. The hook will not jam, experience rapid wear, or suffer from abnormal temperature rise before the oil film disappears. The rate of oil film loss is closely related to the sewing speed. Extensive sewing and durability testing has accumulated a large amount of data on oil film loss under different working conditions. This data is then incorporated into the oil supply program through algorithmic compensation, combined with extensive external feedback and corrections. This demonstrates that indirect oil supply is feasible and can reliably ensure high-quality operation of the rotary hook while significantly mitigating the problem of lubricating oil contamination of the fabric. The specific control logic is as follows:

[0070] The amount of oil film consumed by the rotary hook varies at different speeds. We divide the consumption into 5 levels: Level 1 (0-1000rpm), consumption is F; Level 2 (1000-2000rpm), consumption is G; Level 3 (2000-3000rpm), consumption is H; Level 4 (3000-4000rpm), consumption is I; Level 5 (4000-5000rpm), consumption is J.

[0071] Based on the above parameters, and considering the user's actual requirements for oil contamination, three more parameters are introduced: oil-free lubrication coefficient L, micro-oil lubrication coefficient M, and fully lubricated lubrication coefficient N.

[0072] Let the amount of fuel supplied at one time be K:

[0073] K≧a×t1+b×t2+c×t3+d×t4+e×t5-(F×t1+G×t2+H×t3+I×t4+J×t5);

[0074] a, b, c, d, and e are initial coefficients, and the time ranges from t1 to t5. The data represent the actual sewing time for the corresponding consumption level.

[0075] Once the above equation is true, the solenoid valve is de-energized and stops supplying oil.

[0076] K≦(F×t6+G×t7+H×t8+I×t9+J×t10)×lubrication coefficient. When this equation holds, the solenoid valve is energized to start supplying oil. The above times t6~t10 are all actual sewing times, obtained by extracting the rotary hook speed and the corresponding time period.

[0077] Through the innovative design of the algorithm and oil circuit structure described above, the rotary hook is precisely and indirectly lubricated via the machine control panel, minimizing the amount of lubricating oil thrown out and thus minimizing fabric contamination. This solves the problems of excessive oil volume, difficult adjustment, and fabric contamination caused by the traditional rotary hook oil volume control system, achieving the following technological advancements:

[0078] Stable fuel supply and convenient fuel volume adjustment;

[0079] For parts with low precision requirements, the oil level can be corrected through parameter compensation.

[0080] Good versatility: compatible with most existing lockstitch sewing machines;

[0081] Adjustment method: simple and intuitive;

[0082] This application eliminates the original oil adjusting screw and uses two oil nozzles with different cross-sections and controls the amount of oil in the rotary hook by controlling the motor speed;

[0083] The rotary hook oil supply circuit can be applied to sewing equipment to meet the needs of high-end sewing.

[0084] Alternatively, a structure can be used to achieve precise oil supply to the rotary hook by switching the oil supply end on and off, such as an independent oil pump.

[0085] In summary, this invention aims to solve the problems of unstable oil supply, fabric contamination, and insufficient lubrication of the rotary hook caused by the influence of spindle speed on the oil supply of the existing sewing equipment. By constructing an independently driven rotary hook oil supply circulation loop with an electronic oil pump, the oil supply and sewing conditions are decoupled. Combined with the oil nozzle cross-section difference design and the application of electronic control algorithms, digital precision oil supply can be achieved, realizing precise and indirect micro-oil lubrication of the rotary hook. This ensures that the rotary hook obtains a stable oil film at different speeds, reduces oil consumption and contamination, and extends the service life of the rotary hook.

[0086] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A rotary shuttle oil supply circulation circuit, characterized in that, It includes an electronic oil pump (1), an oil supply nozzle (2), an oil return nozzle (3), an oil supply pipe (4), and an oil return pipe (5); the electronic oil pump (1) is an independent oil supply source and is connected to the oil supply pipe (4) and the oil return pipe (5); The oil supply pipe (4) supplies oil to the rotary hook via the oil supply nozzle (2), and the oil return pipe (5) returns the oil to the electronic oil pump (1) via the oil return nozzle (3); The cross-sectional area of ​​the oil supply nozzle (2) is larger than that of the return nozzle (3), and the difference between their cross-sectional areas is 0.1 to 1 mm². The working state of the electronic oil pump (1) is independent of the spindle speed of the sewing machine. The speed of the electronic oil pump (1) is adjusted by the sewing machine control system to supply oil independently to the rotary hook.

2. The rotary shuttle oil supply circulation circuit as described in claim 1, characterized in that, The channel cross-section of the oil supply nozzle (2) is circular; the channel cross-section of the oil return nozzle (3) is circular.

3. The rotary shuttle oil supply circulation circuit as described in claim 1, characterized in that, The electronic oil pump (1) is equipped with a controller to match the oil supply under the working conditions of the rotary shuttle; the controller is connected to a sensor to obtain the rotary shuttle speed working parameters and control the electronic oil pump (1) to start and stop the oil supply according to the preset formula.

4. The rotary shuttle oil supply circulation circuit as described in claim 3, characterized in that, The controller has a built-in oil film consumption model unit, which divides the oil film working conditions and oil sludge requirement working conditions of the rotary hook into consumption conditions and lubrication conditions, and dynamically supplies oil in cycles according to the operating time of consumption conditions and lubrication conditions.

5. The rotary shuttle oil supply circulation circuit as described in claim 1, characterized in that, The oil supply nozzle (2) and the oil return nozzle (3) are detachable.

6. The rotary shuttle oil supply circulation circuit as described in claim 4, characterized in that, The electronic oil pump (1) and controller are an integrated module that is connected to the sewing machine control system via a bus interface for unified speed regulation and data acquisition.

7. The rotary shuttle oil supply circulation circuit as described in claim 1, characterized in that, The sewing machine control system includes a solenoid valve assembly, which controls the oil circuit to open or close when the controller sends an on / off signal, thus completing the start and stop of oil supply.

8. The rotary shuttle oil supply circulation circuit as described in claim 7, characterized in that, The sewing machine control system is equipped with a rotary hook temperature sensor or a rotary hook vibration sensor to obtain the oil supply conditions.

9. A rotary shuttle assembly, characterized in that, Includes the rotary oil supply circulation circuit as described in any one of claims 1-8.

10. A sewing device, characterized in that, Includes the rotary shuttle assembly as described in claim 9.

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