A control method and control system for constant feed of oil to a rotating shuttle

Abstract

A kind of rotary hook quantitative oil supply control method, first, according to the interval of the machine speed of sewing machine is divided into N equal parts, i.e. N interval, the oil supply capacity corresponding to the nth interval is An, and the rotary hook demand for lubricating oil is Fn;Second, through the sewing machine electric control record or extract the working time of machine speed in N interval, the time corresponding to the nth interval is Tn, and the on-off valve oil supply time record is Un, and the electromagnetic valve does not supply oil time record is Un;Third, set the oil supply amount as K;K meets different conditions, and the on-off valve stops or opens oil supply;Rotary hook quantitative oil supply control system, including oil pump, oil supply pipe one, oil supply pipe two, return pipe, oil pan, electromagnetic valve is arranged between oil supply pipe one and oil supply pipe two, and the electromagnetic valve is connected with sewing machine electric control and control panel;At least three gear buttons are provided on the control panel, corresponding to the oil amount required by sewing machine electric control, and the on-off flow of the electromagnetic valve corresponding to the sewing machine electric control is controlled.

Description

Technical Field

[0001] This invention relates to the field of precision oil supply technology for rotary hooks, a core component of lock sewing machines, and specifically to a method and device for quantitative oil supply control of rotary hooks. 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, lubrication is required at the rotary hook guide rails to ensure its normal operation.

[0003] Current rotary hook oil supply systems are powered by an oil pump powered by the main shaft. This structure ensures the reliability of the oil pump but also brings some limitations. Since the power of the oil pump is tied to the machine's main shaft, the most direct result is that the oil pump starts supplying oil as soon as the machine starts working, and the amount of oil is uncontrollable. Feedback from numerous users indicates that such an oil supply system can cause excessive oil supply and difficulty in adjusting the oil volume, resulting in excess oil at the rotary hook contaminating the fabric.

[0004] The existing rotary hook oil supply system is powered by the oil pump of the main shaft. This means that the power of the oil pump is tied to the machine main shaft, making the amount of oil pumped uncontrollable. As a result, the oil supply is too large and the oil volume is difficult to adjust, causing excess oil at the rotary hook to contaminate the fabric.

[0005] Chinese patent application number 2022221480846 discloses a rotary shuttle quantitative oil supply control method, which uses multiple clamping columns to deform to different degrees according to the curved shape of the bumper, and all of them clamp the sealing ring, so that the end of the sealing ring away from the clamping column is more closely clamped to the bumper, thereby improving the sealing effect. However, it does not improve the installation position and still has the above-mentioned defects. The prior art lacks technical measures to solve this problem.

[0006] With users demanding higher and higher standards in garment processing, the original oil supply system can no longer meet the technical requirements, and a solution is urgently needed. Summary of the Invention

[0007] In view of this, and in light of the shortcomings of the prior art, the purpose of this invention is to provide a rotary hook quantitative oil supply control method to achieve controllable and quantitative oil supply, satisfying lubrication while avoiding excessive supply and spillage that contaminates the fabric.

[0008] This application aims to solve one of the problems in the background art. The technical solution adopted by the present invention is as follows: To achieve the above-mentioned objective and other related objectives, the present invention provides the following technical solution:

[0009] A rotary shuttle quantitative oil supply control method includes the following steps:

[0010] The first step is to divide the sewing machine into N equal parts according to the machine speed range, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricant requirement of the rotary hook is Fn.

[0011] The second step is to record or extract the working time of the machine speed in N intervals through the sewing machine electronic control. The time corresponding to the nth interval is the oil supply time of the on / off valve, which is recorded as Tn, and the oil supply time of the solenoid valve is recorded as Un.

[0012] The third step is to define the amount of fuel supplied at one time as K;

[0013] When K meets the following conditions, the on / off valve stops supplying oil:

[0014]

[0015] When K meets the following conditions, the on / off valve will start supplying oil:

[0016]

[0017] L is the lubrication coefficient.

[0018] Preferably, the relationship curve between L and the contaminated fabric is obtained by measuring the degree of contamination of the fabric by the lubricating oil.

[0019] Preferably, the first step is to divide the sewing machine into N equal intervals according to the machine speed range.

[0020] Preferably, the machine speed is divided into 5 levels: Level 1 0-1000rpm, with oil supply capacity set as a; Level 2 1000-2000rpm, with oil supply capacity set as b; Level 3 2000-3000rpm, with oil supply capacity set as c; Level 4 3000-4000rpm, with oil supply capacity set as d; and Level 5 4000-5000rpm, with oil supply capacity set as e.

[0021] The lubricant requirements of the rotary hook at different speeds are as follows: Gear 1 (0-1000rpm): Lubricant requirement F; Gear 2 (1000-2000rpm): Lubricant requirement G; Gear 3 (2000-3000rpm): Lubricant requirement H; Gear 4 (3000-4000rpm): Lubricant requirement I; Gear 5 (4000-5000rpm): Lubricant requirement J.

[0022] Based on the degree of oil stains on the fabric, select the value of L from the relationship curve between L and the contaminated fabric.

[0023] t1 to t5 are the fuel supply times, and T6 to T10 are the non-fuel supply times;

[0024] Let the amount of fuel supplied at one time be K;

[0025] K = a*t1 + b*t2 + c*t3 + d*t4 + e*t5 - (F*t1 + G*t2 + H*t3 + I*t4 + J*t5). Once the equation holds true, the solenoid valve is de-energized and stops supplying oil.

[0026] K = (F*t6 + G*t7 + H*t8 + I*t9 + J*t10) * L. Once the equation holds true, the solenoid valve is energized to start supplying oil.

[0027] A rotary hook quantitative oil supply control system includes an oil pump, an oil supply pipe 1, an oil supply pipe 2, a return oil pipe, and an oil pan. Using the aforementioned rotary hook quantitative oil supply control method, a solenoid valve is installed between the oil supply pipe 1 and the oil supply pipe 2. The solenoid valve is connected to a sewing machine electronic control unit and a control panel. The control panel has at least three buttons corresponding to the oil volume required by the sewing machine electronic control unit, and the solenoid valve corresponding to the sewing machine electronic control unit is used to control the on / off flow rate of the solenoid valve.

[0028] The beneficial effects of this invention are:

[0029] An on / off valve, i.e. a solenoid valve, is installed on the oil line from the oil pan to the rotary hook to control the oil supply. The oil volume can be quickly adjusted by the buttons on the operation interface. The oil volume is controllable and has good versatility.

[0030] The structure of this application is simple: it has few parts and includes some standard parts; the application has good versatility: it has high integration and good adaptability and can be directly matched and installed on the existing flat sewing machine oil pan;

[0031] The quantitative oil supply control method provided by this invention can effectively match the required amount of oil supply. Based on the degree of oil contamination received, an appropriate L value is selected, thereby realizing the quantitative oil supply control of the rotary hook.

[0032] This system solves the problems of excessive oil volume and difficult adjustment caused by the traditional rotary hook oil volume control system, resulting in fabric contamination, and significantly saves on the use of lubricating oil, enabling on-demand oil supply to the rotary hook. Attached Figure Description

[0033] Figure 1 This is a system diagram of a rotary shuttle quantitative oil supply control system according to the present invention;

[0034] Figure 2 This is a perspective view of the application of a rotary shuttle quantitative oil supply control system according to the present invention;

[0035] Figure 3 This is a schematic diagram of the control panel of a rotary shuttle quantitative oil supply control system according to the present invention;

[0036] Figure 4 This is a schematic diagram of the electrical control system for a sewing machine according to the present invention, which is a rotary hook quantitative oil supply control system.

[0037] In the picture:

[0038] 1. Oil pump

[0039] 2. Oil supply pipe one

[0040] 3. Solenoid valve

[0041] 4. Oil supply pipe two

[0042] 5. Return oil pipe

[0043] 6. Oil pan

[0044] 7. Control Panel

[0045] 8. Sewing machine electrical control. Detailed Implementation

[0046] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0047] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0049] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] A rotary shuttle quantitative oil supply control method, characterized by comprising the following steps:

[0051] The first step is to divide the sewing machine into N equal parts according to the machine speed range, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricant requirement of the rotary hook is Fn.

[0052] The second step is to record or extract the working time of the machine speed in N intervals through the sewing machine electronic control. The time corresponding to the nth interval is the oil supply time of the on / off valve, which is recorded as Tn, and the oil supply time of the solenoid valve is recorded as Un.

[0053] The third step is to define the amount of fuel supplied at one time as K;

[0054] When K meets the following conditions, the on / off valve stops supplying oil:

[0055]

[0056] When K meets the following conditions, the on / off valve will start supplying oil:

[0057]

[0058] L is the lubrication coefficient.

[0059] Specifically, by measuring the degree of contamination of the fabric by the lubricating oil, the relationship curve between L and the contaminated fabric is measured and obtained.

[0060] Specifically, the first step is to divide the range of the sewing machine's rotation speed into N equal intervals.

[0061] Specifically, the machine speed is divided into 5 levels: Level 1 0-1000rpm, with oil supply capacity set to a; Level 2 1000-2000rpm, with oil supply capacity set to b; Level 3 2000-3000rpm, with oil supply capacity set to c; Level 4 3000-4000rpm, with oil supply capacity set to d; and Level 5 4000-5000rpm, with oil supply capacity set to e.

[0062] The lubricant requirements of the rotary hook at different speeds are as follows: Gear 1 (0-1000rpm): Lubricant requirement F; Gear 2 (1000-2000rpm): Lubricant requirement G; Gear 3 (2000-3000rpm): Lubricant requirement H; Gear 4 (3000-4000rpm): Lubricant requirement I; Gear 5 (4000-5000rpm): Lubricant requirement J.

[0063] t1 to t5 are the fuel supply times, and T6 to T10 are the non-fuel supply times;

[0064] Let the amount of fuel supplied at one time be K;

[0065] K = a*t1 + b*t2 + c*t3 + d*t4 + e*t5 - (F*t1 + G*t2 + H*t3 + I*t4 + J*t5). Once the equation holds true, the solenoid valve is de-energized and stops supplying oil.

[0066] K = (F*t6 + G*t7 + H*t8 + I*t9 + J*t10) * L. Once the equation holds true, the solenoid valve is energized to start supplying oil.

[0067] like Figure 1-4 A rotary hook quantitative oil supply control system includes an oil pump 1, an oil supply pipe 2, an oil supply pipe 4, a return oil pipe 5, and an oil pan 6. A solenoid valve 3 is installed between the oil supply pipe 2 and the oil supply pipe 4. The solenoid valve 3 is connected to a sewing machine control panel 8 and a control panel 7. The control panel 7 is equipped with at least three buttons corresponding to the oil volume required by the sewing machine control panel 8, and the solenoid valve 3 is controlled by the flow rate of the sewing machine control panel 8.

[0068] In summary, this application optimizes the original oil supply system hardware and integrates the rotary hook oil volume control with the machine control panel and electronic control. It replaces the traditional mechanical oil volume adjustment with digital button adjustment on the control panel, making the adjustment more intuitive, precise, and convenient. The rotary hook oil supply principle involves the oil pump and main shaft power connected via an adapter shaft. When the machine starts running, it drives the oil pump power shaft to rotate, and the oil pump begins pumping oil. The oil pump outlet branches into multiple branches, one of which supplies lubrication to the rotary hook. This invention now matches a self-developed electromagnetic on / off valve to the oil supply circuit. The on / off state of the electromagnetic valve is controlled by the machine's operation to achieve precise, on-demand lubrication of the rotary hook. The system operates by first having the worker select the current sewing oil control requirements. After the selection, the worker selects the corresponding three oil volume shortcut buttons on the control panel: oilless lubrication, low-oil lubrication, and full lubrication.

[0069] Once the machine starts working, the sewing machine's electronic control system will begin recording operating data such as the sewing machine's working time and speed, along with the required level of oil stain control.

[0070] Using an internal oil consumption algorithm, the oil pump's oil supply capacity is affected by the machine's speed. First, we divide the machine's speed into 5 levels: Level 1 (0-1000rpm) has an oil supply capacity of a; Level 2 (1000-2000rpm) has an oil supply capacity of b; Level 3 (2000-3000rpm) has an oil supply capacity of c; Level 4 (3000-4000rpm) has an oil supply capacity of d; and Level 5 (4000-5000rpm) has an oil supply capacity of e. The amount of lubricating oil required by a rotary hook varies at different speeds. We divide this requirement into five levels: Level 1 (0-1000rpm), lubricating oil requirement F; Level 2 (1000-2000rpm), lubricating oil requirement G; Level 3 (2000-3000rpm), lubricating oil requirement H; Level 4 (3000-4000rpm), lubricating oil requirement I; and Level 5 (4000-5000rpm), lubricating oil requirement J. Based on the above parameters, and considering the user's actual requirements for oil contamination, we introduce three more lubrication coefficients for different levels of lubrication: no lubrication, slightly lubricated, and fully lubricated.

[0071] Let the amount of fuel supplied at one time be K;

[0072] K=a*t1+b*t2+c*t3+d*t4+e*t5-(F*t1+G*t2+H*t3+I*t4+J*t5);

[0073] Once the above equation is true, the solenoid valve is de-energized and stops supplying oil.

[0074] K = (F*t6 + G*t7 + H*t8 + I*t9 + J*t10) * lubrication coefficient;

[0075] Once the above equation is true, the solenoid valve is energized and begins to supply oil.

[0076] Through the above oil supply calculations and innovative design of the oil circuit structure, the rotary hook is precisely micro-lubricated via the machine control panel; this achieves minimal control of fabric contamination caused by the rotary hook; it solves the problem of fabric contamination caused by excessive oil volume and difficulty in adjustment in the original traditional rotary hook oil volume control system, and greatly saves the use of lubricating oil, realizing on-demand oil supply to the rotary hook;

[0077] The selection of L can distinguish the following different working conditions:

[0078] In situations where oil stain control is extremely critical, an oil-free lubrication setting can be selected, such as for sewing silk and down jackets. This setting prioritizes oil stain control, which may sacrifice some of the lifespan of the rotary hook, but can achieve zero contamination of the fabric by the lubricating oil at the rotary hook.

[0079] For applications requiring high oil stain control, the micro-oil lubrication setting can be selected. This setting is suitable for most sewing applications, ensuring both the lifespan of the rotary hook and keeping oil stains to a very small level.

[0080] The fully lubricated setting is for high-intensity sewing scenarios where oil contamination requirements are not very high, such as continuous high-speed sewing operations. The above three settings have been verified to control oil contamination better than the current traditional rotary hook oil supply method.

[0081] The above description is only a preferred embodiment of the present invention. 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 invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlling the quantitative oil supply of a rotary shuttle, characterized in that, Includes the following steps: The first step is to divide the sewing machine into N segments according to the machine speed range, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricant requirement of the rotary hook is Fn. The second step is to record or extract the working time of the machine speed in N intervals through the sewing machine electronic control. The time corresponding to the nth interval is the oil supply time of the solenoid valve, which is recorded as Tn, and the oil supply time of the solenoid valve is recorded as Un. The third step is to define the amount of fuel supplied at one time as K; When K meets the following condition, the solenoid valve stops supplying oil: When K meets the following condition, the solenoid valve will start supplying oil: L is the lubrication coefficient.

2. The rotary shuttle quantitative oil supply control method as described in claim 1, characterized in that, By measuring the degree of fabric contamination caused by lubricating oil, the relationship curve between L and the contaminated fabric is measured and obtained.

3. The rotary shuttle quantitative oil supply control method as described in claim 1, characterized in that, The first step is to divide the sewing machine into N equal intervals according to the machine speed range.

4. The rotary shuttle quantitative oil supply control method as described in claim 1, characterized in that, The machine speed is divided into 5 levels: Level 1 0-1000rpm, oil supply capacity set to a; Level 2 1000-2000rpm, oil supply capacity set to b; Level 3 2000-3000rpm, oil supply capacity set to c; Level 4 3000-4000rpm, oil supply capacity set to d; Level 5 4000-5000rpm, oil supply capacity set to e. The lubricant requirements of the rotary hook at different speeds are as follows: Gear 1 (0-1000rpm): Lubricant requirement F; Gear 2 (1000-2000rpm): Lubricant requirement G; Gear 3 (2000-3000rpm): Lubricant requirement H; Gear 4 (3000-4000rpm): Lubricant requirement I; Gear 5 (4000-5000rpm): Lubricant requirement J. Based on the degree of oil stains on the fabric, select the value of L from the relationship curve between L and the contaminated fabric. t1 to t5 are the fuel supply times, and T6 to T10 are the non-fuel supply times; Let the amount of fuel supplied at one time be K; K = a*t1 + b*t2 + c*t3 + d*t4 + e*t5 - (F*t1 + G*t2 + H*t3 + I*t4 + J*t5). Once the equation holds true, the solenoid valve is de-energized and stops supplying oil. K = (F*t6 + G*t7 + H*t8 + I*t9 + J*t10) * L. Once the equation holds true, the solenoid valve is energized to start supplying oil.

5. A rotary shuttle quantitative oil supply control system, using the rotary shuttle quantitative oil supply control method according to any one of claims 1-4, comprising an oil pump (1), an oil supply pipe one (2), an oil supply pipe two (4), an oil return pipe (5), and an oil pan (6), characterized in that, A solenoid valve (3) is installed between oil supply pipe 1 (2) and oil supply pipe 2 (4). The solenoid valve (3) is connected to the sewing machine control (8) and the control panel (7). The control panel (7) is equipped with at least three buttons corresponding to the oil volume required by the sewing machine control (8) and the on / off flow of the solenoid valve (3) corresponding to the sewing machine control (8).

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