Linear actuator maintenance method and system

Abstract

A linear transmission maintenance method and system, the linear transmission maintenance method is suitable for calculating a life value of a linear transmission, and includes the following steps: receiving a plurality of electrical signals fed back by a sensing unit installed on the linear transmission and a driving device, calculating at least four correction factors according to the electrical signals, and calculating the life value according to the electrical signals and the correction factors. In this way, since the calculation is based on the actual usage, the estimation accuracy of the life value can be improved, and the equipment manufacturer can more accurately arrange maintenance or part replacement according to the actual condition of the machine.

Description

Technical Field

[0001] This invention relates to a device maintenance method and system, and more particularly to a linear drive device maintenance method and a linear drive device maintenance system using the method. Background Technology

[0002] After prolonged use, fatigue erosion can easily occur at the inlet and outlet of the return pipe of a linear drive device. When the erosion reaches a certain level, the components need to be repaired or replaced to ensure the processing quality.

[0003] Currently, machine maintenance mostly relies on annual or periodic maintenance, or further, using cumulative operating time or cumulative operating cycles to determine whether repairs or component replacements are needed. However, because the processing objects of a machine differ each time it operates, the load varies, resulting in different lifespans for each operation. In other words, even with the same cumulative operating time or cumulative operating cycles, different operating loads will lead to different lifespan losses. Therefore, estimating the remaining lifespan solely based on a pre-set cumulative operating time or cumulative operating cycles will result in inaccurate lifespan estimates. Summary of the Invention

[0004] The purpose of this invention is to provide a maintenance method for linear transmission devices with high accuracy in life estimation.

[0005] The linear drive maintenance method of the present invention is applied to a control unit of a signal-connected drive device, the drive device being used to drive the linear drive device. The linear drive device maintenance method is applicable to calculating the lifespan value of the linear drive device and includes the following steps:

[0006] The system receives multiple electrical signals from sensing units installed in the linear transmission device and the drive device, calculates at least four correction factors based on the electrical signals, and calculates the lifetime value based on the electrical signals and the correction factors.

[0007] The linear transmission device maintenance method of the present invention has at least two correction factors that have a nonlinear relationship with their corresponding electrical signals, wherein the electrical signals are related to at least four of the following: stress, stroke, speed, temperature, and acceleration.

[0008] The linear transmission device maintenance method of the present invention calculates five correction factors based on the stress, stroke, speed, temperature and acceleration information in the electrical signal. The five correction factors are load correction factor, stroke correction factor, speed correction factor, temperature correction factor and impact correction factor.

[0009] The linear drive maintenance method of the present invention calculates the actual working equivalent based on the electrical signal and the correction factor, and calculates the life value based on the actual working equivalent.

[0010] The linear drive maintenance method of the present invention calculates the actual working equivalent F based on the electrical signal and the correction factor according to the following formula. act And based on the actual working equivalent F act Calculate the lifetime value:

[0011]

[0012] Among them, A t A is the temperature correction factor. s A is the travel correction factor. i Let A be the impact correction factor. f Let A be the load correction factor. r F is the velocity correction factor. iavg For the interval average load, N iavg For the interval average speed, N avg For the periodic average rotational speed, t i Let t be the interval time. cycle Let n be the periodic time, and n be the number of intervals within the period.

[0013] The linear transmission device maintenance method of the present invention is described in P. max When the load correction factor is greater than 2.0 GPa, the load correction factor A is calculated according to the following formula. f If not, make A f =1:

[0014] A f =a f ×P max 3 ;

[0015] Among them, P max a is the maximum stress value obtained based on the electrical signal. f This is the load factor.

[0016] The linear drive maintenance method of the present invention calculates the temperature correction factor A according to the following formula when the temperature corresponding to the electrical signal is between 80 and 200°C. t If not, make A t =1:

[0017] A t =a t1 ×T 3 +a t2 ×T 2 +a t3 ×T+at4 ;

[0018] Where T is temperature, a t1 a t2 a t3 a t4 It has four temperature coefficients.

[0019] The linear transmission maintenance method of the present invention further calculates the oil consumption variable f related to oil loss according to the following formula:

[0020]

[0021] Among them, a o b o For two fuel consumption coefficients, F MAX To allow the highest load, F op DN is the actual maximum load obtained based on the electrical signal. MAX To allow the highest DN value, DN op The actual highest DN value is obtained based on the electrical signal. The DN value is the product of the outer diameter of the long shaft of the linear transmission device and the rotational speed.

[0022] The purpose of this invention is to provide a linear transmission device maintenance system with high accuracy in life estimation.

[0023] The linear transmission device maintenance system of the present invention includes a linear motion unit, a sensing unit, and a control unit.

[0024] The linear motion unit includes a linear transmission device and a drive device for driving the linear transmission device.

[0025] The sensing unit is disposed on the linear motion unit and is used to sense the operation of the linear motion unit and output multiple electrical signals.

[0026] The control unit is signal-connected to the linear motion unit and the sensing unit, used to control the operation of the linear motion unit, calculate at least four correction factors based on the electrical signal, and calculate the lifespan value of the linear transmission device based on the electrical signal and the correction factors.

[0027] The present invention discloses a linear transmission device maintenance system, wherein the linear transmission device has a long shaft, a movable member disposed on the long shaft and defining at least one return channel, and a plurality of rolling members, the rolling members rolling between the long shaft and the movable member and in the at least one return channel, one of the inlets and outlets of the rolling members entering and exiting the at least one return channel is defined as a return point, and the sensing unit includes a sensor disposed on the movable member, wherein the distance between the sensor and the return point in the extension direction of the long shaft is less than 3 times the diameter of the rolling member.

[0028] The beneficial effects of the present invention are as follows: the lifespan value is calculated by the multiple electrical signals fed back by the sensing unit installed on the linear motion unit. Since the calculation is based on the actual usage, the accuracy of the lifespan value estimation can be improved. This allows equipment manufacturers to more accurately arrange maintenance or parts replacement schedules according to the actual condition of the machine, reducing losses caused by sudden machine failures and downtime. Attached Figure Description

[0029] Figure 1 This is a block diagram of an embodiment of the linear transmission device maintenance system of the present invention;

[0030] Figure 2 This is an incomplete exploded view of the embodiment described;

[0031] Figure 3 This is an incomplete top view of the embodiment; and

[0032] Figure 4 This is an application flowchart of an embodiment of the linear transmission device maintenance method of the present invention. Detailed Implementation

[0033] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.

[0034] See Figure 1 , Figure 2 and Figure 3 An embodiment of the linear transmission device maintenance system of the present invention includes a linear motion unit 2, a sensing unit 3, and a control unit 4, and optionally also includes a display unit 5.

[0035] The linear motion unit 2 includes a linear transmission device 20 and a drive device 24 for driving the linear transmission device 20.

[0036] The linear transmission device 20 includes a long shaft 21, a moving part 22 disposed on the long shaft 21, and a plurality of rolling parts 23.

[0037] The linear transmission device 20 can be a ball screw as shown in this embodiment, with the long shaft 21, the moving part 22, and the rolling part 23 being a screw, a nut, and a ball, respectively. The linear transmission device 20 can also be a linear slide rail (not shown), with the long shaft 21, the moving part 22, and the rolling part 23 being a slide rail, a slider, and a ball, respectively, or it can be any other linearly movable transmission device depending on actual needs.

[0038] The moving member 22 includes a body 221 and two return components 222 disposed on the body 221. Each return component 222 defines a return channel 223, causing the rolling member 23 to circulate between the long axis 21 and the moving member 22, and within the return channel 223. One of the inlets and outlets of the rolling member 23 entering and exiting the return channel 223 is defined as a return point 224. Figure 3 In this example, the leftmost inlet / outlet is defined as the return point 224. The number of return components 222 can be determined according to actual needs, and can be one or more.

[0039] The drive device 24 is used to drive the long shaft 21 to move linearly relative to the moving part 22, and has a drive circuit 241 and a motor 242.

[0040] Since those skilled in the art can deduce the details of the expansion of the linear motion unit 2 from the above description, they will not be repeated here.

[0041] The sensing unit 3 is disposed between the linear transmission device 20 and the drive device 24, and is used to sense the operation of the linear transmission device 20 and the drive device 24 and output multiple electrical signals. The sensing unit 3 includes multiple sensors 31.

[0042] One of the sensors 31 is screwed into a groove 225 on the outer surface of the body 221 of the moving member 22, and one sensing end 311 of the sensor 31 can be embedded in the body 221 to achieve better measurement results through stable setting. The sensor 31 is set corresponding to the return point 224, and is as close as possible to the return point 224 in the circumferential direction. In the axial direction, the distance between the sensor 31 and the return point 224 in the direction of extension of the long axis 21 is less than a predetermined distance D. That is, the sensor 31 is basically in the same (or close to) radial direction as the return point 224, and the distance between the groove 225 of the moving member 22 and the return point 224 in the direction of extension of the long axis 21 is less than the predetermined distance D. This distance is calculated based on the center point position of the object. The predetermined distance D can be set according to actual needs to be 3 times the diameter of the ball (the rolling member 23) or 3 times the lead of the screw (the long axis 21). Thus, by placing the sensor 31 adjacent to the return point 224, the sensor 31 can better sense the temperature and acceleration (impact force) corresponding to the return point 224. The sensor 31 can be implemented using, for example, a temperature-sensing chip and an accelerometer. Additionally, for clarity of illustration, Figure 3The main body 221, the sensor 31, and a transmission line 9 connected to the control unit 4 are all drawn with dotted chain lines.

[0043] The other sensors 31 are used to sense force, stroke, and speed to output corresponding electrical signals. The stress is, for example, the stress on the linear transmission device 20, such as the stress on the contact surface between the rolling element 23 and the long shaft 21 and the return assembly 222, which can be sensed using, for example, a force sensor (e.g., a piezoelectric crystal, displacement gauge, strain gauge, etc.). The stroke is, for example, the distance that the moving element 22 moves linearly relative to the long shaft 21. The speed is, for example, the speed at which the moving element 22 moves linearly relative to the long shaft 21, or the rotational speed of the long shaft 21 (screw). The distance can be measured and the speed calculated using, for example, an optical ruler, or the number of rotations of the motor 242 can be measured using a rotary encoder, Hall sensor, etc., to estimate the distance and speed of the moving element 22 relative to the long shaft 21 (screw), or to estimate the rotational speed of the long shaft 21 (screw).

[0044] The control unit 4 is connected to the linear motion unit 2, the sensing unit 3 and the display unit 5, and is used to control the operation of the linear motion unit 2 and calculate at least four correction factors based on the electrical signal, wherein at least two of the correction factors have a non-linear relationship with their corresponding electrical signals. The control unit 4 calculates a lifespan value of the linear transmission device 20 based on the electrical signal and the correction factors.

[0045] The display unit 5 is a display screen that is controlled by the control unit 4 to display the lifespan value so that the user can know the current lifespan of the linear transmission device 20.

[0046] The linear drive maintenance method of the present invention is applicable to the control unit 4 described above, and is also applicable to calculating the lifespan value of the linear drive 20. The linear drive maintenance method includes the following steps:

[0047] The system receives multiple electrical signals fed back by the sensing unit 3 installed on the linear motion unit 2, calculates at least four correction factors based on the electrical signals, wherein at least two of the correction factors have a non-linear relationship with their corresponding electrical signals, and calculates the lifetime value based on the electrical signals and the correction factors.

[0048] The electrical signals may be related to stress (load), stroke, speed, temperature, and acceleration (impact force), etc. The correction factors may be, for example, a load correction factor, a stroke correction factor, a speed correction factor, a temperature correction factor, and an impact correction factor. Users can select at least four of the electrical signals to calculate the corresponding correction factors according to their actual needs.

[0049] The control unit 4 calculates the lifespan value L according to the following formula. left In this embodiment, the lifetime value L left The remaining lifespan percentage (%) refers to the remaining lifespan value, for example, the lifespan value L. left The value of 80% indicates that there are still 80% of the lifespan remaining. However, in actual use, the lifespan value can also be designed as a depletion lifespan value. For example, when the depletion lifespan value is 20%, it means that there are still 80% of the lifespan remaining.

[0050]

[0051]

[0052] Where CY represents the cumulative number of work cycles; L act The actual lifespan value refers to the calculated service life of the linear transmission device 20 under actual conditions; for example, the number of cycles it can operate under actual conditions, calculated from the data. basic The theoretical lifespan value refers to the service life of the linear transmission device 20 under theoretical (or baseline) conditions; for example, the number of operating cycles under theoretical conditions. l Where L is the loss-inducing lifetime equivalent, and L is the theoretical lifetime value. basic Compared with the actual lifespan value L act The ratio of , therefore The value of F represents the proportion of lifespan lost in each cycle under actual conditions; act For a practical working equivalent; F basic This is a theoretical working equivalent, a value derived from the specifications of the linear transmission device 20; A general The system safety factor is the specification of the linear transmission device 20. For example, its value is set to 1.1, 1.3, and 2 for level 1 (smoothness), level 2 (normal), and level 3 (impact vibration), respectively.

[0053] Taking the linear transmission device 20 as an example with a ball screw, the principle of the above formula is explained, and the theoretical life value L of the linear transmission device 20 is given. basic Compared with the actual lifespan value Lact The formula is as follows:

[0054] (Unit: cycle)

[0055] (Formula 3)

[0056] (Unit: cycle)

[0057] (Formula 4)

[0058] Where Lead is the lead of the screw, Ca is the rated dynamic load of the linear transmission device 20, which is a value obtained according to the specifications of the linear transmission device 20, and Stroke basic For theoretical travel, Stroke act This is the actual itinerary. Because under normal circumstances, Stroke basic ≈Stroke act Therefore, the equivalent of the loss life X can be... l It is approximately equivalent to Formula 2.

[0059] Returning to the stated lifetime value L left The control unit 4 calculates the actual working equivalent F according to the following formula. act The following description uses a ball screw as an example of the linear transmission device 20:

[0060]

[0061] Among them, A t For the temperature correction factor, A s For the aforementioned travel correction factor, A i For the impact correction factor, A f For the load correction factor, A r The velocity correction factor is t. cycle Where n is the periodic time, n is the number of intervals within one period, and t is the periodic time. i The time interval refers to the time spent on a set of repetitive tasks. These tasks are divided into multiple (n) intervals based on computational or practical needs. Each interval includes one or more tasks. iavg For the interval average load, N i avg The average rotational speed of the screw within a given range, N avg The average rotational speed of the screw during the cycle is denoted as .

[0062] In Formula 5, at least four of the aforementioned correction factors can be selected for calculation according to actual needs, and the calculated values ​​are substituted into Formula 5 to calculate the lifetime value L using Formulas 1, 2, and 5. left If the selected correction factor is not selected, then the value 1 can be substituted.

[0063] The calculation formula for the correction factor is as follows, wherein the load correction factor A f The travel correction factor A s The temperature correction factor A t The impact correction factor A i The corresponding electrical signals are all nonlinear. It should be noted that, generally, when there is limited data, only two data points are used to generate a correction line. In this case, the correction line and the correction factor will have a linear relationship, resulting in low estimation accuracy. This paper replaces the estimation methods for at least two correction factors with the following nonlinear calculation method to achieve higher estimation accuracy:

[0064] The load correction factor A f :

[0065] At P max When the load is >2.0 GPa (gigapascals), the load correction factor A is calculated according to the following formula. f If not, make A f =1.

[0066] A f =a f ×P max 3 ; (Formula 6)

[0067] Among them, P max a is the maximum stress value of the ball screw calculated based on the electrical signal during the cycle. f This is a load factor, determined experimentally based on actual needs; for example, it can be set to 0.125.

[0068] The travel correction factor A s :

[0069] When Θ < TU, the travel correction factor A is calculated according to the following formula. s If not, make A s =1. Where Θ is the number of screw turns corresponding to one operating cycle, and TU is the basic number of turns (turns unit), which refers to the number of screw turns spanned by the return assembly 222. TU is generally set to 2 to 5.

[0070]

[0071] The speed correction factor A r :

[0072] At DN op >DN MAX At that time, the speed correction factor A is calculated according to the following formula. r If not, make A r =1. Where, DN MAX To allow the highest DN value, DN op The highest actual DN value obtained from the electrical signal during the cycle is DN, which is the product of the outer diameter of the long shaft 21 of the linear transmission device 20 and the rotational speed.

[0073]

[0074] Among them, a r This is a velocity coefficient, typically set between 1.5 and 2. ω MAX ω is the maximum permissible rotational speed of the long shaft 21. op The actual maximum rotational speed of the long shaft 21 during the cycle, as determined by the electrical signal.

[0075] The temperature correction factor A t :

[0076] When the temperature corresponding to the electrical signal (the temperature at the return point 224) is between 80 and 200°C, the temperature correction factor A is calculated according to the following formula. t If not, make A t =1;

[0077] A t =a t1 ×T 3 +a t2 ×T 2 +a t3 ×T+a t4 ; (Formula 9)

[0078] Where T is temperature, a t1 a t2 a t3 a t4 It has four temperature coefficients, which can be set according to actual needs; for example, it can be set to a. t1 = -1×10 -7 a t2 =3×10 -5 a t3 =-0.004, a t4 =1.1.

[0079] The impact correction factor A i:

[0080] When A > 15G (gravitational acceleration), make A i =0, if not, make A i =1. Where A is the acceleration value measured by the sensor 31.

[0081] See Figure 1 and Figure 4 The following explanation is provided based on the application process:

[0082] Step 61: The sensing unit 3 senses force, stroke, speed, temperature and acceleration, and outputs the corresponding electrical signals, and the control unit 4 receives the electrical signals.

[0083] Step 62: The control unit 4, according to the work being performed, splits the electrical signal into multiple cycles, and then divides each cycle into multiple periods.

[0084] Step 63: Based on the electrical signal and the above calculation method, calculate the at least four selected correction factors and the actual working equivalent F. act .

[0085] Step 64: Based on the actual working equivalent F act The pre-stored theoretical working equivalent F basic With the system safety factor A general The loss life equivalent X is calculated using Formula 2 above. l .

[0086] Step 65: Based on the aforementioned loss lifetime equivalent X l The cumulative number of working cycles CY and the theoretical lifespan value L basic Calculate the lifetime value L left and the lifetime value L left The information is displayed on the display unit 5 to inform the user.

[0087] It is worth noting that steps 64 and 65 can also be replaced by first calculating the actual lifespan value L according to formula 4. act Then, based on the cumulative number of working cycles CY and the actual lifespan value L... act Calculate the lifetime value L left (Formula 1).

[0088] Based on a real-world example, calculations using the screw specifications in Table 1 below can yield the stroke correction factor A under the operating conditions described in Tables 2-4 below. s Temperature correction factor A t Impact correction factor A i Load correction factor Af Speed ​​correction factor A r Actual working equivalent F act Loss life equivalent X l Lifespan attrition ratio As can be seen from Tables 2-4, comparing the values ​​in Tables 3 and 4 with those in Table 2 (under normal conditions), under the high-load operation conditions in Table 3, the equivalent wear life X l A significant increase will lead to a decrease in the proportion of lifespan. This means that the lifespan lost in each operating cycle will be greater than its theoretically possible lifespan. In the short-stroke, low-load operation shown in Table 4, the equivalent lifespan loss X... l A decrease will lead to a reduction in the proportion of lifespan loss. The decline means that the lifespan lost in each operating cycle is less than the theoretically possible lifespan.

[0089]

[0090] Table 1

[0091] Here, "Turn No." refers to the number of basic volumes (turns units). Figure 2 For example, in the case of a ball bearing, the number of rolls is 2, meaning it has 2 loop units (two strings of beads). ω i Let ω be the rotational speed at time ti. Taking Table 2 as an example, in this case, the different loads and speeds of stage 1 and stage 2 constitute a periodic motion. The actual maximum rotational speed ω under this periodic motion is... op It is 750 rpm.

[0092]

[0093]

[0094] Table 2

[0095]

[0096] Table 3

[0097]

[0098]

[0099] Table 4

[0100] It is worth mentioning that the linear transmission device maintenance method can also calculate a fuel consumption equivalent X according to the following formula. o And a fuel consumption life L oil And can calculate the fuel consumption equivalent X. o With the aforementioned fuel consumption life L oilThe output is sent to the display unit 5 for user viewing. The fuel consumption equivalent X... o This is the ratio of the theoretical lubrication cycle to the actual lubrication cycle.

[0101] Users can determine the fuel consumption life L based on the stated fuel consumption life. oil The decision to activate the lubricating oil dispenser (not shown) to add lubricating oil is determined by the control unit 4, based on the oil consumption life L. oil Determine whether to turn on the oil injection machine.

[0102]

[0103] Where f is a fuel consumption variable related to fuel loss; a o b o There are two fuel consumption coefficients that can be set according to actual needs; for example, they can be set to a. o =0.8, b o =0.2; F MAX For the maximum allowable load; F op The actual highest load obtained from the electrical signal during the cycle.

[0104] The fuel consumption equivalent X is calculated according to Formula 10. o Then, the lubrication cycle CY can be determined according to the theoretical lubrication cycle. oil-basic Based on the cumulative number of working cycles CY, the current fuel consumption life L is calculated using the following formula 11. oil ,in, This refers to the proportion of fuel consumption per cycle under actual conditions.

[0105]

[0106] Same as the lifetime value L described above left The explanation in Formula 11 uses the remaining fuel consumption life value as the explanation, but the lost fuel consumption life value can also be calculated and displayed according to actual needs.

[0107] Based on the above explanation, the effects of this embodiment are as follows:

[0108] 1. By calculating at least four correction factors based on multiple electrical signals fed back by the sensing unit 3 installed on the linear motion unit 2, and at least two of the correction factors having a non-linear relationship with their corresponding electrical signals, the lifespan value is calculated based on the electrical signals and the correction factors. Since the calculation is based on actual usage, the accuracy of the lifespan value estimation can be improved, enabling equipment manufacturers to more accurately arrange maintenance or parts replacement schedules according to the actual condition of the machine, and reducing losses caused by sudden machine downtime.

[0109] Second, by calculating the oil consumption variable related to oil loss based on the electrical signal, the current oil consumption life can also be obtained, which can be used by equipment personnel or the control unit 4 to determine whether the oiling machine needs to be turned on to replenish lubricating oil. In this way, the oiling and lubrication cycle can be adjusted in a timely manner according to the actual operation of the machine to achieve better processing quality and longer service life.

[0110] Third, by setting the sensor 31 to correspond to the return point 224, the sensor 31 can better measure the usage status at the inlet and outlet of the return channel 223, and can provide measurement data that is closer to the actual state, so as to obtain a more accurate life value estimation result.

[0111] In summary, the linear transmission device maintenance method and system of the present invention can indeed achieve the purpose of the present invention.

[0112] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A maintenance method for a linear drive device, applied to a control unit of a signal-connected drive device, the drive device being used to drive the linear drive device, the maintenance method for the linear drive device being suitable for calculating the lifespan value of the linear drive device, characterized in that: The maintenance method for the linear drive device includes the following steps: The system receives multiple electrical signals from sensing units installed in the linear transmission and the drive unit, calculates at least four correction factors based on the electrical signals, and calculates the lifetime value based on the electrical signals and the correction factors. Specifically, five correction factors are calculated based on the stress, stroke, speed, temperature, and acceleration information in the electrical signal. These five correction factors are the load correction factor, stroke correction factor, speed correction factor, temperature correction factor, and impact correction factor. The actual working equivalent is calculated based on the electrical signal and the correction factor according to the following formula. And based on the actual working equivalent Calculate the lifetime value: in, The temperature correction factor is... The travel correction factor is... This refers to the impact correction factor. The load correction factor is... The speed correction factor is... The average load over the interval, The average rotational speed over the interval. The periodic average rotational speed, For interval time, For periodic time, The number of intervals within a period. At At that time, the load correction factor is calculated according to the following formula. If not, make : in, The maximum stress value obtained based on the electrical signal. For load factor, When the temperature corresponding to the electrical signal is between 80 and 200°C, the temperature correction factor is calculated according to the following formula. If not, make : in, For temperature, , , , It has four temperature coefficients.

2. The maintenance method for a linear transmission device according to claim 1, characterized in that: At least two correction factors have a nonlinear relationship with their corresponding electrical signals, and the electrical signals are related to at least four of the following: stress, stroke, speed, temperature, and acceleration.

3. The maintenance method for the linear transmission device according to claim 2, characterized in that: The actual working equivalent is calculated based on the electrical signal and the correction factor, and the lifetime value is calculated based on the actual working equivalent.

4. The maintenance method for a linear transmission device according to claim 1, characterized in that: The fuel consumption variable related to fuel loss is also calculated using the following formula. : ； in, , All are fuel consumption coefficients. To allow the highest load, The actual maximum load obtained based on the electrical signal. To allow the highest DN value, The actual highest DN value is obtained based on the electrical signal. The DN value is the product of the outer diameter of the long shaft of the linear transmission device and the rotational speed.

5. A linear drive maintenance system for implementing the linear drive maintenance method as described in claim 1, comprising a linear motion unit: The linear motion unit includes a linear transmission device and a drive device for driving the linear transmission device; Its features are: The linear drive maintenance system also includes a sensing unit and a control unit; The sensing unit is disposed on the linear motion unit and is used to sense the operation of the linear motion unit and output multiple electrical signals; The control unit is connected to the linear motion unit and the sensing unit to control the operation of the linear motion unit and to calculate at least four correction factors based on the electrical signal. The control unit also calculates the lifespan value of the linear transmission device based on the electrical signal and the correction factors.

6. The linear transmission device maintenance system according to claim 5, characterized in that: The linear transmission device has a long shaft, a moving member disposed on the long shaft and defining at least one return channel, and a plurality of rolling members, the rolling members rolling between the long shaft and the moving member and in the at least one return channel, one of the inlets and outlets of the rolling members entering and exiting the at least one return channel is defined as the return point, the sensing unit includes a sensor disposed on the moving member, the distance between the sensor and the return point in the extension direction of the long shaft is less than 3 times the diameter of the rolling member.

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