Method and system for controlling quantitative oil supply of rotating shuttle

Abstract

A quantitative oil supply control method for a rotating shuttle comprises the steps that firstly, the interval of the machine rotating speed of a sewing machine is divided into N equal parts, namely N intervals, the oil supply capacity corresponding to the nth interval is An, and the lubricating oil demand quantity of the rotating shuttle is Fn; 2, the working time of the rotating speed of the machine in N intervals is recorded or extracted through electric control of the sewing machine, the time corresponding to the nth interval is the oil supply time of an on-off valve and recorded as Tn, and the non-oil supply time of an electromagnetic valve is recorded as Un; thirdly, the oil supply amount is set to be K at a time; when K meets different conditions, the on-off valve stops or starts oil supply; a quantitative oil supply control system for a rotating shuttle comprises an oil pump, a first oil supply pipe, a second oil supply pipe, an oil return pipe and an oil pan, an electromagnetic valve is arranged between the first oil supply pipe and the second oil supply pipe, and the electromagnetic valve is connected with a sewing machine electric controller and a control panel. The control panel is provided with at least three-gear buttons corresponding to the oil quantity required by electric control of the sewing machine, and the electric control of the sewing machine correspondingly controls the on-off flow of the electromagnetic valve.

Description

Technical Field

[0001] The invention relates to the technical field of precise oil supply for a rotary hook, a core component of a lockstitch sewing machine, and in particular to a method for controlling quantitative oil supply for a rotary hook and an oil supply device. Background Art

[0002] The rotary hook is an important part of the thread hooking mechanism of the sewing machine. When the sewing machine is working, the rotary hook will be in a high-speed running state. Since the rotary hook is composed of an outer shuttle frame and an inner shuttle frame, the inner shuttle frame is stationary relative to the outer shuttle frame during sewing, while the outer shuttle frame rotates at a high speed with the lower shaft. The inner and outer shuttle frames are connected together through a guide rail, and high-speed sliding friction occurs at the guide rail, and the maximum speed can reach 10,000 revolutions per minute. Therefore, the guide rail position of the rotary hook needs to be lubricated to ensure the normal operation of the rotary hook.

[0003] The current rotary hook oil supply system is provided by an oil pump whose power source comes from the main shaft. This structure can ensure the reliability of the oil pump but also brings some limitations, because the power of the oil pump is bound to the machine main shaft; the most direct result is that the oil pump starts to supply oil when the machine starts working and the amount of oil cannot be controlled; a large number of usage results have shown that such an oil supply system will cause excessive oil supply and difficulty in adjusting the oil volume, causing excess oil at the rotary hook to contaminate the fabric.

[0004] The power source of the existing rotary hook oil supply system comes from the main shaft oil pump. In this way, the power of the oil pump is bound to the machine main shaft, making the oil volume of the oil pump uncontrollable. Therefore, 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 No. 2022221480846 discloses a method for controlling the quantitative oil supply of a rotary hook, 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 fitted to the bumper, thereby improving the sealing effect. However, the installation position is not improved, and the above-mentioned defects still exist. The prior art lacks technical measures to solve them.

[0006] As users now have higher and higher requirements for clothing 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, facing the shortcomings of the prior art, the purpose of the present invention is to provide a method for controlling the quantitative oil supply of a rotary hook, so as to achieve controllable and quantitative oil supply, meet the lubrication requirements, and avoid excessive supply and overflow to contaminate the fabric.

[0008] The present application aims to solve one of the problems in the background technology. The technical solution adopted by the present invention is to provide the following technical solutions to achieve the above-mentioned purpose and other related purposes:

[0009] A method for controlling the quantitative oil supply of a rotary hook comprises the following steps:

[0010] The first step is to divide the speed range of the sewing machine into N equal parts, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricating oil demand 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 electronic control of the sewing machine. The time corresponding to the nth interval is the oil supply time of the on-off valve recorded as Tn, and the oil non-supply time of the solenoid valve recorded as Un;

[0012] The third step is to set the oil supply quantity to be K;

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

[0014]

[0015] K meets the following conditions, the on-off valve starts to supply oil:

[0016]

[0017] L is the lubrication coefficient.

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

[0019] Preferably, in the first step, the interval of the sewing machine speed is divided into N equal intervals.

[0020] Preferably, the machine speed is divided into 5 gears: the first gear is 0-1000rpm, the oil supply capacity is set to a; the second gear is 1000-2000rpm, the oil supply capacity is set to b; the third gear is 2000-3000rpm, the oil supply capacity is set to c; the fourth gear is 3000-4000rpm, the oil supply capacity is set to d; the fifth gear is 4000-5000rpm, the oil supply capacity is set to e;

[0021] At different speeds, the lubricating oil demand of the rotary hook is as follows: the first gear is 0-1000rpm, the lubricating oil demand is F; the second gear is 1000-2000rpm, the lubricating oil demand is G; the third gear is 2000-3000rpm, the lubricating oil demand is H; the fourth gear is 3000-4000rpm, the lubricating oil demand is I; the fifth gear is 4000-5000rpm, the lubricating oil demand is J;

[0022] According to the degree of oily fabric, select L value from the relationship curve of L corresponding to polluted fabric;

[0023] t1 to t5 is the oil supply time, T6 to T10 is the oil non-supply time;

[0024] Assume the oil supply at one time is K;

[0025] K=a*t1+b*t2+c*t3+d*t4+e*t5-(F*t1+G*t2+H*t3+I*t4+J*t5), after the equation is established, the solenoid valve is powered off and the oil supply stops;

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

[0027] A rotary hook quantitative oil supply control system comprises an oil pump, a first oil supply pipe, a second oil supply pipe, an oil return pipe and an oil pan. The above-mentioned rotary hook quantitative oil supply control method is applied, a solenoid valve is arranged between the first oil supply pipe and the second oil supply pipe, and the solenoid valve is connected to a sewing machine electronic control and a control panel; at least three gear buttons are arranged on the control panel corresponding to the oil volume required by the sewing machine electronic control, and the on-off flow rate of the sewing machine electronic control corresponding to the control solenoid valve.

[0028] Beneficial effects of the present invention:

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

[0030] The structure of the present application is simple: the number of parts is small and includes some standard parts; the present application has good versatility: the integration is high, the adaptability is good and it can be directly matched and installed on the existing flat-seam oil pan;

[0031] The quantitative oil supply control method provided by the present invention can well match the required amount of oil supply, and select a suitable L value according to the accepted oil pollution degree, thereby realizing the quantitative oil supply control of the rotary hook;

[0032] It solves the problem of excessive oil volume and fabric contamination caused by difficult adjustment in the original traditional rotary hook oil volume control system, saves a lot of lubricating oil, and realizes on-demand oil supply to the rotary hook. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0034] Figure 2 This is a three-dimensional application diagram of a rotary hook quantitative oil supply control system of the present invention;

[0035] Figure 3 It is a schematic diagram of a control panel of a rotary hook quantitative oil supply control system of the present invention;

[0036] Figure 4 It is a schematic diagram of a sewing machine electronic control system of a rotary hook quantitative oil supply control system of the present invention;

[0037] In the figure:

[0038] 1. Oil pump

[0039] 2. Oil supply pipe 1

[0040] 3. Solenoid valve

[0041] 4. Oil supply pipe 2

[0042] 5. Oil return pipe

[0043] 6. Oil pan

[0044] 7. Control Panel

[0045] 8. Sewing machine electronic control. DETAILED DESCRIPTION

[0046] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0050] A method for controlling the quantitative oil supply of a rotary hook, characterized in that it comprises the following steps:

[0051] The first step is to divide the speed range of the sewing machine into N equal parts, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricating oil demand 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 electronic control of the sewing machine. The time corresponding to the nth interval is the oil supply time of the on-off valve recorded as Tn, and the oil non-supply time of the solenoid valve recorded as Un;

[0053] The third step is to set the oil supply quantity to be K;

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

[0055]

[0056] K meets the following conditions, the on-off valve starts to supply oil:

[0057]

[0058] L is the lubrication coefficient.

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

[0060] Specifically, in the first step, the speed range of the sewing machine is divided into N equal intervals.

[0061] Specifically, the machine speed is divided into 5 gears: the first gear is 0-1000rpm, the oil supply capacity is set to a; the second gear is 1000-2000rpm, the oil supply capacity is set to b; the third gear is 2000-3000rpm, the oil supply capacity is set to c; the fourth gear is 3000-4000rpm, the oil supply capacity is set to d; the fifth gear is 4000-5000rpm, the oil supply capacity is set to e;

[0062] At different speeds, the lubricating oil demand of the rotary hook is as follows: the first gear is 0-1000rpm, the lubricating oil demand is F; the second gear is 1000-2000rpm, the lubricating oil demand is G; the third gear is 2000-3000rpm, the lubricating oil demand is H; the fourth gear is 3000-4000rpm, the lubricating oil demand is I; the fifth gear is 4000-5000rpm, the lubricating oil demand is J;

[0063] t1 to t5 is the oil supply time, T6 to T10 is the oil non-supply time;

[0064] Assume the oil supply at one time is K;

[0065] K=a*t1+b*t2+c*t3+d*t4+e*t5-(F*t1+G*t2+H*t3+I*t4+J*t5), after the equation is established, the solenoid valve is powered off and the oil supply stops;

[0066] K=(F*t6+G*t7+H*t8+I*t9+J*t10)*L. After the equation is established, 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 1 2, an oil supply pipe 2 4, an oil return pipe 5, and an oil pan 6. A solenoid valve 3 is arranged between the oil supply pipe 1 2 and the oil supply pipe 2 4. The solenoid valve 3 is connected to a sewing machine electronic control 8 and a control panel 7. At least three gear buttons are arranged on the control panel 7 corresponding to the amount of oil required by the sewing machine electronic control 8, and the sewing machine electronic control 8 controls the on-off flow of the solenoid valve 3 accordingly.

[0068] In general, the present application optimizes the design of the original oil supply system hardware, and combines the rotary hook oil quantity control with the machine control panel and electronic control, and changes the traditional mechanical oil quantity adjustment to the oil quantity adjustment through the digital buttons on the control panel, so that the adjustment amount is more intuitive, more detailed and more convenient; the rotary hook oil supply principle is that the oil pump is connected to the spindle power through the adapter shaft, and the machine starts to run and drives the oil pump power shaft to rotate, and the oil pump starts to pump oil; the oil pump outlet will be divided into multiple branches, and one branch will supply lubrication to the rotary hook; now the present invention matches a self-developed electromagnetic on-off valve to the oil supply end oil circuit; the on-off of the electromagnetic valve is controlled by the machine operation situation to realize the precise on-demand supply of lubricating oil to the rotary hook; the operating principle of this system is that the worker first selects the level of oil pollution control required for the current sewing; after the judgment is completed, select the corresponding three-speed oil quantity shortcut key button on the control panel: oil-free lubrication, micro-oil lubrication, and full lubrication;

[0069] When the machine starts working, the sewing machine electronic control will start to record the sewing machine working time, machine speed and other operating data and combine them with the oil pollution control requirement level;

[0070] Through a set of internal oil consumption algorithms, the oil pump's ability to supply oil will be affected by the machine speed. First, we divide the machine speed into 5 gears. The first gear is 0-1000rpm, and the oil supply capacity is set to a; the second gear is 1000-2000rpm, and the oil supply capacity is set to b; the third gear is 2000-3000rpm, and the oil supply capacity is set to c; the fourth gear is 3000-4000rpm, and the oil supply capacity is set to d; the fifth gear is 4000-5000rpm, and the oil supply capacity is set to e. Similarly, at different speeds, the demand for lubricating oil of the rotary hook is also different. We also divide the demand into 5 levels. The first level is 0-1000rpm, and the lubricating oil demand is F; the second level is 1000-2000rpm, and the lubricating oil demand is G; the third level is 2000-3000rpm, and the lubricating oil demand is H; the fourth level is 3000-4000rpm, and the lubricating oil demand is I; the fifth level is 4000-5000rpm, and the lubricating oil demand is J. Based on the above parameters, we introduce three lubrication coefficients with different lubrication levels in combination with the actual strictness of the user's requirements for oil pollution, namely, the lubrication coefficient of the oil-free lubrication level, the lubrication coefficient of the micro-oil lubrication level, and the lubrication coefficient of the full lubrication level;

[0071] Assume the oil supply at one time is K;

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

[0073] When the above equation is established, the solenoid valve is powered off and stops supplying oil;

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

[0075] When the above equation is established, the solenoid valve is energized to start supplying oil;

[0076] Through the above-mentioned oil supply calculation and the innovative design of the oil circuit structure, the rotary hook can be precisely micro-lubricated through the machine control panel; the rotary hook can be minimized to control the fabric pollution; the problem of fabric pollution caused by excessive oil and difficult adjustment caused by the original traditional rotary hook oil control system can be solved, and a large amount of lubricating oil can be saved, so as to realize the on-demand oil supply to the rotary hook;

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

[0078] In working conditions with extremely high requirements for oil pollution control, the oil-free lubrication gear can be selected, such as sewing silk and down jackets. This gear gives priority to controlling oil pollution, which may sacrifice the service life of part of the rotary hook, and can achieve zero pollution of the fabric by the lubricating oil at the rotary hook;

[0079] For working conditions with high requirements for oil pollution control, you can choose the micro-oil lubrication gear; this gear lubrication is suitable for most sewing working conditions, which can not only well ensure the service life of the rotary hook but also control the oil pollution within a very small range;

[0080] The full lubrication gear is designed for high-intensity sewing scenarios that do not require high oil pollution, such as continuous high-speed sewing. The above three gears have been verified to have better actual oil pollution control than the current traditional rotary hook oil supply method.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling the quantitative oil supply of a rotary hook, characterized in that: The steps include: The first step is to divide the speed of the sewing machine into N intervals, that is, N intervals. The oil supply capacity corresponding to the nth interval is An, and the lubricating oil demand 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 electronic control of the sewing machine. The time corresponding to the nth interval is the oil supply time of the on-off valve recorded as Tn, and the oil non-supply time of the solenoid valve recorded as Un; The third step is to set the oil supply quantity to be K; K meets the following conditions, the on-off valve stops supplying oil: ； K meets the following conditions, the on-off valve starts to supply oil: L is the lubrication coefficient.

2. A method for controlling the quantitative oil supply of a rotary hook as claimed in claim 1, characterized in that: By measuring the degree of contamination of the lubricating oil on the fabric, the relationship curve between L and the contaminated fabric is measured and obtained.

3. A method for controlling the quantitative oil supply of a rotary hook as claimed in claim 1, characterized in that: The first step is to divide the speed range of the sewing machine into N equal intervals.

4. A method for controlling the quantitative oil supply of a rotary hook as claimed in claim 1, characterized in that: The machine speed is divided into 5 gears: the first gear is 0-1000rpm, the oil supply capacity is set to a; the second gear is 1000-2000rpm, the oil supply capacity is set to b; the third gear is 2000-3000rpm, the oil supply capacity is set to c; the fourth gear is 3000-4000rpm, the oil supply capacity is set to d; the fifth gear is 4000-5000rpm, the oil supply capacity is set to e; At different speeds, the lubricating oil demand of the rotary hook is as follows: the first gear is 0-1000rpm, the lubricating oil demand is F; the second gear is 1000-2000rpm, the lubricating oil demand is G; the third gear is 2000-3000rpm, the lubricating oil demand is H; the fourth gear is 3000-4000rpm, the lubricating oil demand is I; the fifth gear is 4000-5000rpm, the lubricating oil demand is J; According to the degree of oily fabric, select L value from the relationship curve of L corresponding to polluted fabric; t1 to t5 is the oil supply time, T6 to T10 is the oil non-supply time; Assume the oil supply at one time is K; K=a*t1+b*t2+c*t3+d*t4+e*t5-(F*t1+G*t2+H*t3+I*t4+J*t5), after the equation is established, the solenoid valve is powered off and the oil supply stops; K=(F*t6+G*t7+H*t8+I*t9+J*t10)*L. After the equation is established, the solenoid valve is energized to start supplying oil.

5. A rotary hook quantitative oil supply control system, using a rotary hook quantitative oil supply control method according to any one of claims 1 to 4, comprising an oil pump (1), an oil supply pipe 1 (2), an oil supply pipe 2 (4), an oil return pipe (5), and an oil pan (6), characterized in that: An electromagnetic valve (3) is arranged between the first oil supply pipe (2) and the second oil supply pipe (4), and the electromagnetic valve (3) is connected to the sewing machine electronic control (8) and the control panel (7); the control panel (7) is provided with at least three gear buttons corresponding to the oil volume required by the sewing machine electronic control (8), and the sewing machine electronic control (8) controls the on-off flow of the electromagnetic valve (3) accordingly.

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