TWI832630B - Machine tool and component replacement prediction method for machine tool - Google Patents

Abstract

A machine tool and a component replacement prediction method for the machine tool. The machine tool includes a sensing device and an analysis device installed on a machine platform mechanism. The pulling unit of the machine mechanism can drive the chain that suspends the spindle box to maintain an upward pulling force equal to the gravity of the spindle box when the spindle box is driven to move up and down. The sensing device includes a measured object that is driven and displaced by the pulling unit, and a sensing module installed on the machine body and used to sense the measured object. The analysis device can analyze the sensing data generated by the sensing module to determine the wear and stretch length of the chain. Through the structural design of the sensing device and the analysis device provided on the machine mechanism, the wear and stretch length of the chain can be automatically sensed and analyzed, which is quite convenient and practical.

Description

Machine tool and component replacement prediction method for machine tool

The present invention relates to a mechanical equipment, in particular to a machine tool that can be installed with a cutting tool for processing objects.

Existing machine tools used for processing such as milling and cutting generally include a spindle box suspended from a machine body via a chain for installing processing tools, a spindle box installed on the machine body and telescopically connected up and down. The hydraulic cylinder of the chain, and a driver installed on the machine body and capable of driving the main spindle box up and down relative to the machine body. The gravity of the main spindle box will be directly transmitted to the chain, causing the chain to be stretched and stretched. The hydraulic cylinder can stretch up and down to exert a downward traction force on the chain, so that the chain exerts an upward pulling force on the spindle box, thereby balancing the weight of the spindle box, so that the driver can save effort. The main spindle box is driven to move up and down.

However, after this kind of machine tool is used for a period of time, the chain will stretch due to long-term stress and wear. When the chain stretches beyond a predetermined length, it will easily cause machine failure or affect processing operations. Currently, the chain stretch length can only be measured manually using tools on a regular basis. In addition to being quite inconvenient, the measurement process also involves industrial safety risks.

It is therefore an object of the present invention to provide a machine tool that improves at least one of the disadvantages of the prior art.

Therefore, the machine tool of the present invention includes a machine mechanism, a sensing device and an analysis device. The machine mechanism includes a machine body, a spindle box mounted on the machine body so as to be displaceable up and down, a driving unit mounted on the machine body and connected to the spindle box, and a drive unit with both ends connected to the machine body respectively. The machine body and the spindle box are suspended relative to the machine body by a chain of the spindle box, and a pulling unit is installed on the machine body and connected between both ends of the chain. The driving unit can be used to drive the main spindle box to move up and down relative to the machine body. The pulling unit can be used to pull and drive the chain, so that when the main spindle box is driven to move up and down, the chain maintains a predetermined upward pulling force on the main spindle box, and the predetermined pulling force is equal to the gravity of the main spindle box.

The sensing device includes a subject disposed on the pulling unit, and a sensing module installed on the machine body and capable of sensing the subject in a predetermined direction to generate sensing data. The measured body will be synchronously driven and displaced relative to the sensing module when the pulling unit drives the chain. The signal of the analysis device is connected to the sensing module and can receive and analyze the sensing data to determine the wear and stretch length of the chain.

The effect of the present invention is that through the structural design of the machine mechanism, the sensing device and the analysis device, the wear and stretch length of the chain can be automatically sensed and analyzed, which is very convenient and practical.

Another object of the present invention is to provide a method for predicting component replacement of a machine tool that can improve at least one shortcoming of the prior art.

Therefore, the component replacement prediction method for machine tools of the present invention includes the following steps: a pulling unit transmission is arranged between a spindle box and a machine body, and the head of the spindle box is suspended relative to the machine body. The chain operates so that when the main spindle box is driven up and down, the chain maintains a predetermined pulling force that is upward and equal to the gravity of the main spindle box, and causes a drive unit of the machine mechanism to move at intervals. A predetermined time drives the lifting and lowering displacement of the main spindle box to a reference position of the machine body; causing a sensing module to sense a measured object provided on the pulling unit when the main spindle box is driven to rise and fall to the reference position. The body generates sensing data. When the pulling unit drives the chain to move, the subject will be synchronously driven and displaced relative to the sensing module; an analysis device will store the sensing data, and after accumulating N pieces of sensing data, it will continue Each added piece of sensing data is compared with one of the previously stored pieces of sensing data to obtain a stretch change value, N≧2; and after the analysis device accumulates m stretch change values, each successive cumulative increase For a stretch change value, all currently accumulated stretch change values are analyzed to establish a prediction model about stretch change value and time, and a predetermined stretch threshold is brought into the prediction model to obtain a prediction Replacement time, m≧2.

Therefore, the component replacement prediction method for machine tools of the present invention includes the following steps: a pulling unit transmission is arranged between a spindle box and a machine body, and the head of the spindle box is suspended relative to the machine body. The chain operates so that when the main spindle box is driven up and down, the chain maintains a predetermined pulling force that is upward and equal to the gravity of the main spindle box, and causes a drive unit of the machine mechanism to move at intervals. A predetermined time drives the lifting and lowering displacement of the main spindle box to a reference position of the machine body; causing a sensing module to sense a sensor provided on the pulling unit in a predetermined direction when the main spindle box is driven to rise and fall to the reference position. The object under test generates a sensing data, and the object under test will be synchronously driven and displaced relative to the sensing module when the pulling unit drives the chain; and an analysis device analyzes the sensing data, and When it is determined that the sensing data indicates that the sensing module has not sensed the object, a warning message is issued.

The effect of the present invention is that through the design of the component replacement prediction method, it can be used to automatically sense and analyze the wear and stretch length of the chain of the machine mechanism, and determine that the wear and stretch length has reached the predetermined stretch valve. It is quite convenient and practical to give a warning when the wear stretch length reaches the predetermined stretch threshold, or to predict the possible time when the wear stretch length reaches the predetermined stretch threshold.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated with the same numbering.

Referring to Figures 1, 2, and 3, a first embodiment of a machine tool 200 of the present invention is suitable for installing a processing tool (not shown) for processing objects. The processing includes, but is not limited to, milling, cutting, etc. The machine tool 200 includes a machine mechanism 3 , a sensing device 4 installed on the machine mechanism 3 , and an analysis device 5 connected to the sensing device 4 via signals.

The machine mechanism 3 includes a machine body 31, a spindle box 32 that is displaceably installed on the machine body 31, a driving unit 33 disposed on the machine body 31 and connected to the spindle box 32, and a Its two ends are connected to the machine body 31 and the spindle box 32 respectively, and the chain 34 of the spindle box 32 is suspended relative to the machine body 31, and a chain 34 is installed on the machine body 31 and connected to the chain 34 Pulling unit 35. The machine body 31 is provided with many devices for controlling or driving the main spindle box 32 , the pulling unit 35 and the driving unit 33 . The spindle box 32 can be used to install processing tools, and can be driven to process objects with the processing tools.

The driving unit 33 includes a driver 331 installed and fixed on the machine body 31 , and a transmission screw 332 extending up and down to connect the driver 331 and the machine body 31 and screwed to the main spindle box 32 . The transmission screw 332 can be driven by the driver 331 to rotate around its own axis relative to the machine body 31, thereby driving the screw-connected spindle box 32 to move up and down relative to the machine body 31, and can be used to move the spindle box 32 The lifting transmission moves to a reference position of the machine body 31 . In the first embodiment, the reference position is the position where the machine body 31 is used to replace the machining tool of the spindle box 32, but the implementation is not limited to this.

Since the machine body 31 , the spindle box 32 and the drive unit 33 are not the focus of the present invention, and there are many types, they will not be described in detail, and the implementation is not limited to the figures.

Referring to Figures 1 and 4, the pulling unit 35 includes a telescopic cylinder 351 that extends up and down and is telescopically mounted on the machine body 31, and a pulley 352 pivoted on the top end of the telescopic cylinder 351. In the first embodiment, the telescopic cylinder 351 is a hydraulic cylinder, but the implementation is not limited to this.

The chain 34 has a suspension section 341 that extends up and down and is suspended and connected to the top side of the spindle box 32 with its bottom end, and a suspension section 341 with one end fixed to the machine body 31 and extending around the bottom of the pulley 352. The transmission section 342 is connected to the top of the suspension section 341 . The transmission section 342 bends and extends up and down to form a bent recess 343 with an opening facing upward and for the pulley 352 to be inserted and pressed downward.

The chain 34 will be pulled by the gravity of the main spindle box 32 and stretched, and then the bent concave portion 343 will press upward against the pulley 352 . The telescopic cylinder 351 can exert a downward force on the bending recess 343 of the chain 34 through the pulley 352, and exert an upward force on the main spindle box 32 through the suspension section 341 of the chain 34. Predetermined pulling force. The predetermined pulling force is equal to the gravity of the main spindle box 32 and can be used to balance the weight of the main spindle box 32 .

Referring to Figures 4 and 6, through the structural design of the chain 34 and the pulling unit 35, when the driving unit 33 wants to drive the main spindle box 32 to move up and down relative to the machine body 31, the telescopic cylinder 351 will also be synchronized. The transmission telescopes up and down. That is to say, when the driving unit 33 drives to raise the main spindle box 32, the telescopic cylinder 351 will synchronously drive the pulley 352 to move downward, and pull the bending recess 343 of the chain 34 downward, so that the chain 34 The chain 34 is maintained in the tensile state and the chain 34 continues to exert the predetermined pulling force on the main spindle box 32 , so that the driving unit 33 can drive and raise the main spindle box 32 quite effortlessly and stably. Similarly, when the drive unit 33 lowers the main spindle box 32, the telescopic cylinder 351 will synchronously drive the pulley 352 upward to gradually release the chain 34, so that the bending recess 343 is relative to the machine body 31. Therefore, the chain 34 is maintained in a tensile state that still exerts the predetermined pulling force on the main spindle box 32 , so that the driving unit 33 can lower the main spindle box 32 in a labor-saving and stable manner.

Referring to Figures 2, 3, and 5, the sensing device 4 includes a test object 41 installed and fixed on the top end of the telescopic cylinder 351, and a test object 41 installed and fixed on the machine body 31 and capable of moving the test object in a predetermined direction. The sensing module 42 of 41 is sensed. The measured object 41 can be displaced up and down relative to the sensing module 42 by the telescopic transmission of the telescopic cylinder 351 . The sensing module 42 can generate sensing data according to the sensing results.

In the first embodiment, the object 41 is made of metal, and the sensing module 42 is an inductive sensor. The sensing data generated by the sensing module 42 will be related to the object under test. 41 changes depending on the relative distance between them.

The analysis device 5 is connected to the sensing module 42 via signals, and includes an analysis module 51 , a display module 52 and a warning module 53 . The analysis module 51 can statistically analyze more than a predetermined number of sensing data, and predict and determine a predicted replacement time when the wear and elongation of the chain 34 reaches a predetermined stretch threshold, and display it on the display module 52 The predicted replacement time. In addition, the analysis module 51 will also control the warning module 53 to send a warning message when it is determined that the predicted replacement time is shorter than a predetermined time threshold from the current time. The warning message may be perceptible messages such as, but not limited to, warning sounds, lights, and/or images, or electronic messages such as text messages, push messages, and/or emails. How the analysis device 5 analyzes and obtains the predicted replacement time will be described later.

Referring to Figures 2, 4, and 7, the first embodiment of the component replacement prediction method used by the first embodiment of the machine tool 200 of the present invention includes the following steps:

Step 901: Timingly drive the main spindle box 32 to move up and down to a reference position. The driving unit 33 drives the main spindle box 32 to move up and down to the reference position of the machine body 31 every predetermined time interval. The predetermined time every interval refers to, for example but not limited to, every interval of 12 hours or 24 hours.

While controlling the driving unit 33 to drive the main spindle box 32 to the reference position, it also controls the telescopic cylinder 351 to telescope up and down, thereby synchronously driving the pulley 352 to move up and down to drive the chain 34 so that the chain 34 is maintained in alignment. The main spindle box 32 applies the predetermined pulling force. In addition, the measured object 41 will also be synchronously driven by the telescopic cylinder 351 to move up and down relative to the sensing module 42 .

Step 902: Make the sensing module 42 sense the object 41. The sensing module 42 is configured to sense the object 41 to generate a piece of sensing data when the main spindle box 32 moves to the reference position.

Step 903: Let the analysis device 5 calculate the tensile change value. The analysis module 51 is allowed to receive and store the sensing data generated by the sensing module 42, and after accumulating N pieces of sensing data, N≧2, each successively added piece of sensing data will be compared with the previously stored one. A piece of sensing data is compared and analyzed to obtain a tensile change value representing the wear tensile length of the chain 34 .

In this embodiment, the N+nth piece of sensing data is compared and analyzed with the previously stored n+1th sensing data, n≧1. However, the implementation is not limited to this.

Assuming that the spindle box 32 is driven to move to the reference position every 24 hours, and taking N equal to 90 as an example, that is, the machine tool 200 is used for 90 days, and when 90 pieces of sensing data are accumulated, the analysis module 51 will Starting from the 91st day when the machine tool 200 is used, a difference comparison analysis is performed on the 91st piece of sensing data (taken from the 91st day) and the 2nd piece of sensing data (taken from the 2nd day) to obtain a Tensile change value; then perform a difference comparison analysis on the 92nd sensing data (taken from the 92nd day) and the 3rd sensing data (taken from the 3rd day) to obtain a stretch change value. And so on.

Step 904: Let the analysis device 5 predict the replacement time of the chain 34. The analysis module 51 is allowed to store the tensile change value obtained in each analysis, and after accumulating m tensile change values, m≧2, each time a tensile change value is added to the cumulative total, all the currently accumulated tensile change values will be added. The stretch change values are analyzed to build a predictive model of the stretch change values over time. Then, a predetermined stretch threshold representing the maximum warning value of the stretch change value of the chain 34 is brought into the prediction model to obtain a predicted replacement time, and the predicted replacement time is displayed on the display module 52 . In this embodiment, linear regression analysis is performed on the accumulated m tensile change values to establish the prediction model, but the method of establishing the prediction model during implementation is not limited to this.

Step 905: Cause the analysis device 5 to send a warning message. When the analysis module 51 determines that the predicted replacement time is shorter than a predetermined time threshold relative to the current time, it controls the warning module 53 to issue the warning message.

Through the structural design of the machine tool 200 and the design of the component replacement prediction method of the machine tool 200, after the machine tool 200 starts to be used, for example, after the machine tool 200 replaces a new chain 34 and starts to be used, the drive unit 33 is controlled to drive the main spindle box 32 to the reference position every predetermined time interval, and the pulling unit 35 is synchronously controlled to expand and contract up and down, and the chain 34 is driven to maintain the predetermined force on the main spindle box 32 The state of tension. The sensing device 4 will sense and obtain a piece of sensing data each time the main spindle box 32 is transmitted to the reference position.

The analysis device 5 will automatically analyze the sensing data after accumulating N pieces of sensing data, that is, N days after the machine tool 200 is started to be used, and the chain 34 may have been worn and elongated, so as to The tensile change value of the chain 34 after being used for a predetermined number of days is obtained. Then, the prediction model is automatically established based on the analysis of accumulated tensile change values of more than m pens, and the predetermined stretch threshold is brought into the prediction model to estimate the predicted replacement time, and display the predicted replacement time. Relevant personnel can clearly know the current wear and stretch length of the chain 34 and predict the replacement time. In addition, the analysis device 5 can also send a warning message when the difference between the predicted replacement time and the current time is shorter than the predetermined time threshold to remind relevant personnel to pay attention to the replacement time of the chain 34 .

Referring to FIGS. 1 , 2 , and 8 , the difference between a second embodiment of a machine tool 200 of the present invention and the first embodiment lies in the design of the sensing device 4 and the analysis device 5 . For convenience of explanation, only the differences between the embodiments will be described below.

In the second embodiment, the sensing module 42 is a proximity sensor, such as but not limited to an optical proximity sensor, which can be used to sense whether the object 41 exists in a predetermined direction, and generate the corresponding Sensing data. When the chain 34 is stretched beyond a predetermined length due to wear, the object 41 will move upward or downward out of the predetermined sensing range of the sensing module 42, and the sensing module will 42 does not sense the condition of the subject 41 .

The analysis module 51 can receive and analyze the sensing data, and when it is determined that the sensing data represents that the object 41 is not sensed, control the warning module 53 to issue the warning message.

Referring to Figures 1, 2, 8 and 9, the second embodiment of the component replacement prediction method executed by the second embodiment of the machine tool 200 of the present invention includes the following steps:

Step 901: Timingly drive the main spindle box 32 to move up and down to a reference position. The driving unit 33 drives the main spindle box 32 to move up and down to the reference position of the machine body 31 every predetermined time interval, and the pulling unit 35 drives the main spindle box 32 while the driving unit 33 drives and moves the main spindle box 32. The chain 34 is also synchronously driven to operate, so that the chain 34 maintains applying the predetermined pulling force to the main spindle box 32 .

Step 902: Make the sensing module 42 sense the object 41. The sensing module 42 is configured to sense the object 41 provided on the pulling unit 35 to generate the sensing data when the main spindle box 32 is driven up and down to the reference position.

Step 905: Cause the analysis device 5 to send a warning message. The analysis module 51 is caused to analyze the sensing data, and when it is determined that the sensing data indicates that the sensing module 42 has not sensed the object 41, the warning module 53 is controlled to issue a warning message.

During implementation, in another implementation aspect of the present invention, it is not necessary to provide the display module 52 in the second embodiment.

To sum up, through the structural design of the sensing device 4 installed on the machine mechanism 3 and the design of the analysis device 5 that is signal-connected to the sensing device 4, the machine tool 200 of the present invention can be replaced by this component. The prediction method is designed to automatically sense and analyze the wear and stretch length of the chain 34 of the machine mechanism 3, and the prediction model can be established based on accumulated multiple sensing data to automatically analyze and estimate the wear of the chain 34. The possible time when the stretching reaches the predetermined stretching threshold is given, and a warning is given in advance, so that the operator or maintenance personnel of the machine tool 200 can plan and arrange the operation period and maintenance time of the machine tool 200 in advance. Therefore, the machine tool 200 of the present invention and the component replacement prediction method used for the machine tool 200 are indeed quite innovative, convenient and practical creations, and therefore can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention. They cannot be used to limit the scope of the present invention. All simple equivalent changes and modifications made based on the patent scope of the present invention and the contents of the patent specification are still within the scope of the present invention. within the scope covered by the patent of this invention.

200:Machine tools

3: Machine mechanism

31:Machine body

32:Spindle box

33: Drive unit

331:drive

332: Transmission screw

34:Chain

341: Suspension section

342: Transmission section

343: Bending concave part

35: Pulling unit

351:Telescopic cylinder

352:Pulley

4: Sensing device

41: Subject

42: Sensing module

5:Analysis device

51:Analysis module

52:Display module

53:Alert module

901～905: steps

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view illustrating a first embodiment of the machine tool of the present invention; Figure 2 is a functional block diagram illustrating the control architecture of the first embodiment; Figure 3 is an incomplete front view illustrating the structure of the first embodiment; Figure 4 is an incomplete side view illustrating the structure of the first embodiment; Figure 5 is an incomplete perspective view illustrating the structure of a sensing device of the first embodiment; Figure 6 is a view similar to Figure 4, illustrating the situation when a spindle box is driven to move upward relative to a machine body in the first embodiment; Figure 7 is a step flow chart illustrating the first embodiment of the component replacement prediction method of the first embodiment of the machine tool of the present invention; Figure 8 is a view similar to Figure 5 , illustrating the structure of the sensing device of a second embodiment of the machine tool of the present invention; and FIG. 9 is a step flow chart illustrating the second embodiment of the component replacement prediction method of the second embodiment of the machine tool of the present invention.

3: Machine mechanism

31:Machine body

32:Spindle box

33: Drive unit

34:Chain

341: Suspension section

342: Transmission section

343: Bending concave part

35: Pulling unit

351:Telescopic cylinder

352:Pulley

4: Sensing device

41: Subject

42: Sensing module

Claims (10)

A machine tool, including: a machine mechanism, including a machine body, a spindle box mounted on the machine body to be displaceable up and down, a drive unit mounted on the machine body and connected to the spindle box, a A chain with its two ends respectively connected to the machine body and the spindle box and suspending the spindle box relative to the machine body, and a pulling unit installed on the machine body and connected between the two ends of the chain, The driving unit can be used to drive the main spindle box to move up and down relative to the machine body. The chain bends and extends up and down to form a bent recess between its two ends and with an upward opening. The pulling unit includes a relatively rotatable The pulley is embedded downwardly against the bending recess, and a telescopic cylinder is installed telescopically up and down on the machine body and is pivotally connected to the pulley. The telescopic cylinder can be driven to telescope up and down to drive the pulley. Displace up and down, so that the pulley pulls and drives the chain, so that when the main spindle box is driven to move up and down, the chain maintains a predetermined upward pulling force on the main spindle box, and the predetermined pulling force is equal to the gravity of the main spindle box. ; A sensing device, including a subject disposed on the pulling unit, and a sensing module installed on the machine body and capable of sensing the subject in a predetermined direction to generate sensing data, The measured object will be synchronously driven and displaced relative to the sensing module when the pulling unit drives the chain; and an analysis device, a signal connected to the sensing module, can receive and analyze the sensing data to determine the The wear and stretch length of the chain. The machine tool according to claim 1, wherein the analysis device includes a analyzer An analysis module and a warning module are provided. The analysis module can control the warning module to send a warning message when it analyzes the sensing data and determines that the wear and stretch length of the chain has reached a predetermined stretch threshold. The machine tool according to claim 2, wherein the sensing module is a proximity sensor that can sense the presence of the object in a predetermined direction, and the analysis module can analyze and determine that the sensed data represents an unknown object. When the detected object is sensed, the warning module is controlled to send the warning message. The machine tool of claim 1, wherein the sensing data generated by the sensing module changes as the measured relative distance of the object changes, and the analysis device includes an analysis module and A display module, the analysis module can analyze more than a predetermined number of sensing data, and predict and determine a predicted replacement time when the worn stretch length of the chain reaches a predetermined stretch threshold, and display the The module displays this predicted replacement time. The machine tool according to claim 4, wherein the analysis device further includes a warning module, and the analysis module controls the warning module to issue a warning when it is determined that the predicted replacement time is shorter than a predetermined time threshold. message. The machine tool as described in claim 4 or 5, wherein the drive unit drives the main spindle box to move up and down to a reference position of the machine body at predetermined intervals, and the sensing module detects the displacement of the main spindle box. When reaching the reference position, the object is sensed, and the analysis module will store the sensing data, and after accumulating N pieces of sensing data, it will continue to add the N+nth piece of sensing data with The previously stored n+1 sensing data is compared to obtain a tensile change value. The analysis module will accumulate m tensile changes. After each stretch change value is accumulated, all the currently accumulated stretch change values are analyzed to establish a prediction model about the change of stretch change value over time, and the predetermined stretch threshold value is Bring in the prediction model to get the predicted replacement time, N≧2, n≧1, m≧2. The machine tool according to claim 4, wherein the object to be measured is metal, and the sensing module is an inductive sensor. A component replacement prediction method for machine tools, including the following steps: disposing a pulling unit transmission between a spindle box and a machine body, and actuating a chain of the spindle box suspended relative to the machine body, When the main spindle box is driven to move up and down, the chain maintains a predetermined pulling force that is upward and equal to the gravity of the main spindle box, and causes a driving unit of the machine body to be driven at a predetermined time interval. The main spindle box is driven to move up and down to a reference position of the machine body; a sensing module is driven to sense a measured object disposed on the pulling unit in a predetermined direction when the main spindle box is driven up and down to the reference position. The body generates a sensing data, and the measured body will be synchronously driven and displaced relative to the sensing module when the pulling unit drives the chain; an analysis device is caused to store the sensing data, and the accumulated storage N After sensing data, each successively added sensing data is compared with one of the previously stored sensing data to obtain a stretch change value, N≧2; and the analysis device is configured to accumulate m strokes After the stretch change value is accumulated, each time a stretch change value is accumulated, all currently accumulated stretch change values are analyzed to establish a prediction of the change in stretch change value over time. The prediction model is used, and a predetermined stretch threshold is brought into the prediction model to obtain a predicted replacement time, m≧2. The component replacement prediction method for machine tools as described in claim 8, wherein the analysis device is configured to, after accumulating N pieces of sensing data, compare the N+nth piece of consecutively added sensing data with the previously stored data. The n+1th sensing data is compared to obtain the tensile change value, n≧1. The component replacement prediction method also includes the following steps: causing the analysis device to determine that the difference between the predicted replacement time and the current time is shorter than one When the predetermined time threshold is reached, a warning message is issued. A component replacement prediction method for machine tools, including the following steps: disposing a pulling unit transmission between a spindle box and a machine body, and actuating a chain of the spindle box suspended relative to the machine body, When the main spindle box is driven to move up and down, the chain maintains a predetermined pulling force that is upward and equal to the gravity of the main spindle box, and causes a driving unit of the machine body to be driven at a predetermined time interval. The main spindle box is driven to move up and down to a reference position of the machine body; a sensing module senses a measured object provided on the pulling unit when the main spindle box is driven up and down to the reference position to generate A sensing data, the measured body is synchronously transmitted and displaced relative to the sensing module when the pulling unit drives the chain; and an analysis device is used to analyze the sensing data and determine the sensing data When the sensing module does not sense the object, a warning message is sent.

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