Detection device for spindle of machine tool and detection method for spindle of machine tool

Abstract

The present invention discloses a detection device for a spindle of a machine tool and a detection method for a spindle of a machine tool, wherein the spindle includes a slot. The detection device includes a contact shell, a main shell, a sensing element and a processing module. The contact shell has a first cavity, and the first cavity has an inner surface. The main shell is connected to the contact shell and has a second cavity connected to the first cavity. The sensing element is disposed in the first cavity and connected to the inner surface. The processing module is disposed in the second cavity and electrically connected to the sensing element. When the contact shell is inserted into the slot of the spindle, the sensing element is used to detect a strain of the contact shell and generate a detection signal. The processing module generates a judgment signal based on the detection signal.

Description

Technical Field

[0001] The present invention relates to a detection device and a detection method, and in particular to a detection device for a spindle of a machine tool and a detection method for the spindle of the machine tool. Background Art

[0002] A machine tool for cutting or drilling generally has a spindle, and a tool is detachably mounted on the spindle. The spindle can be used to rotate the tool, and the rotation of the tool enables the tool to cut or drill a target object.

[0003] However, because the tool will wear out during use, it is necessary to replace the tool frequently. During the tool replacement process, the chips generated during cutting or drilling may run into the spindle. When the new tool is installed in the spindle, the chips between the tool and the spindle will cause the tool to tilt and cause a lot of vibration when the tool rotates, which may cause damage to the spindle.

[0004] The general detection method is to coat the surface of the tool with a detection paint, insert the tool into the spindle and then pull it out. The detection paint on the tool is scraped off by the spindle to detect whether there are debris in the spindle. However, the above detection method is not accurate and often has misjudgment. It is necessary to provide an improved detection solution for the spindle of the machine tool. Summary of the invention

[0005] The present invention provides a spindle detection device for a machine tool, which can detect the spindle of the machine tool in real time to prevent a tool from being set on the spindle in a bad state, thereby preventing the spindle from being damaged or affecting the yield of the product produced by the machine tool.

[0006] The present invention provides a detection device for a spindle of a machine tool, wherein the spindle includes a slot. The detection device includes a contact shell, a main shell, a sensing element and a processing module. The contact shell has a first cavity, and the first cavity has an inner surface. The main shell is connected to the contact shell and has a second cavity connected to the first cavity. The sensing element is disposed in the first cavity and connected to the inner surface. The processing module is disposed in the second cavity and electrically connected to the sensing element. When the contact shell is inserted into the slot of the spindle, the sensing element is used to detect a strain of the contact shell and generate a detection signal. The processing module generates a judgment signal based on the detection signal.

[0007] In some embodiments, the contact housing is a conical structure. The slot has a connection surface, and the contact housing has an outer surface. In some embodiments, when the contact housing is inserted into the slot of the spindle, the outer surface contacts the connection surface.

[0008] In some embodiments, the processing module obtains a contact rate according to the detection signal and a quantitative data. The contact rate corresponds to the contact area between the outer surface and the connection surface. In some embodiments, the connection surface and the outer surface are conical.

[0009] In some embodiments, the detection device for the spindle of a machine tool further includes a display module. The display module is electrically connected to the processing module and is used to display a display signal corresponding to the determination signal.

[0010] In some embodiments, the detection device for the spindle of a machine tool further includes a wireless transmission module. The wireless transmission module is electrically connected to the processing module and is used to transmit the determination signal in a wireless manner.

[0011] In some embodiments, the detection device for the spindle of the machine tool further includes a snap-fit ​​element disposed on the contact housing. When the contact housing is inserted into the slot of the spindle, the snap-fit ​​element is snap-fitted into the slot.

[0012] In some embodiments, the sensing element is a strain sensor, and the resistance value of the sensing element corresponds to the strain amount. The sensing element is a long strip structure and extends along a ring path.

[0013] The present invention provides a method for detecting a spindle of a machine tool, comprising: inserting a detection device into a spindle of a machine tool; detecting a strain of a contact shell of the detection device through a sensing element of the detection device and generating a detection signal; and obtaining a contact rate according to the detection signal and a quantitative data through a processing module.

[0014] In some embodiments, quantitative data is obtained according to the following method: a first detection device having a first contact shell is inserted into the main shaft, and the first contact shell is detected by a sensing element of the first detection device, and a first strain amount is obtained, wherein the first contact shell and a connecting surface of the main shaft have a first contact rate; a second detection device having a second contact shell is inserted into the main shaft, and the second contact shell is detected by a sensing element of the second detection device, and a second strain amount is obtained, wherein the first contact shell and a connecting surface of the main shaft have a second contact rate; and the quantitative data is formed according to the above-mentioned first contact rate, the above-mentioned first strain amount, the above-mentioned second contact rate, and the above-mentioned second strain amount.

[0015] In some embodiments, the contact rates are equivalent values ​​of the strain amounts. In some embodiments, the sensing module obtains a determination signal according to the contact rate.

[0016] In summary, the detection device of the present invention can detect the spindle of the machine tool in real time, thereby reducing the probability of spindle damage or improving the yield rate of the products produced by the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] When read in conjunction with the accompanying drawings, various aspects of the present invention can be well understood from the following detailed description. It should be noted that, in accordance with the common practice of this industry, the drawings are not necessarily drawn to scale. In fact, the size of the elements may be arbitrarily enlarged or reduced for clear illustration.

[0018] Figure 1 are cross-sectional views of a machine tool and a detection device of the present invention in some embodiments;

[0019] Figure 2 is a front view of a detection device of the present invention in some embodiments;

[0020] Figure 3 A bottom view of the contact housing and the sensing element of the present invention in some embodiments;

[0021] Figure 4 is a schematic diagram of the detection device of the present invention during a detection process;

[0022] Figure 5 The relationship between contact rate and strain for quantitative data.

[0023] Explanation of symbols:

[0024] Detection device 1

[0025] Contact housing 10

[0026] Tip 11

[0027] Combination end 12

[0028] Outer surface 13

[0029] Extension surface 14

[0030] First cavity 15

[0031] Inner surface 151

[0032] Fastening element 20

[0033] Buckle slot 21

[0034] Limiting element 30

[0035] Limiting slot 31

[0036] Main housing 40

[0037] Second cavity 41

[0038] Sensing element 50

[0039] Processing module 60

[0040] Display module 70

[0041] Display panel 71

[0042] Judgment Light 72

[0043] Wireless transmission module 80

[0044] Machine Tool A1

[0045] Spindle A10

[0046] Slot A11

[0047] Connection surface A12

[0048] Fastening element A13

[0049] Center axis AX1

[0050] Rotation axis AX2

[0051] Extension direction D1

[0052] Loop path P1

[0053] Debris M1 DETAILED DESCRIPTION

[0054] The following description provides many different embodiments, or examples, for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention. For example, a description of a structure in which a first feature is on or above a second feature includes direct contact between the first and second features, or another feature is disposed between the first and second features so that the first and second features are not in direct contact.

[0055] Spatially related terms such as above or below are used only to simply describe the relationship of one element or feature relative to another element or feature in the drawings. In addition to the orientations described in the drawings, the device may be used or operated in different orientations. In addition, the shapes, sizes, thicknesses, and angles of inclination in the drawings may not be drawn to scale or may be simplified for the purpose of clarity and are provided for illustration only.

[0056] Figure 1 sectional views of a machine tool A1 and a detection device 1 according to some embodiments of the present invention. Figure 2It is a front view of the detection device 1 of the present invention according to some embodiments. The machine tool A1 can be a cutting machine or a drilling machine, but is not limited thereto. The machine tool A1 can include a spindle A10. A tool (not shown) can be inserted into a slot A11 of the spindle A10, and the machine tool A1 can rotate the tool via the spindle A10. The tool can be used to cut a target object, or to drill a hole in the target object. Therefore, if a connection surface A12 where the slot A11 connects to the tool is worn, or there are debris M1 such as iron filings (such as Figure 4 The tool may not be properly connected to the spindle A10 when the tool is attached to the connection surface A12. When the spindle A10 rotates the tool, the tool may vibrate, which may cause the tool to not properly process the target object or cause damage to the spindle A10.

[0057] The detection device 1 is inserted into the spindle A10 of the machine tool A1 , and can be used to determine whether the connection surface A12 of the slot A11 is good or whether there are debris M1 such as iron filings attached to the slot A11 through the detection result of the detection device 1 .

[0058] The detection device 1 may include a contact housing 10, a snap-fit ​​element 20, a stopper element 30, a main housing 40, a plurality of sensing elements 50, and a processing module 60. The contact housing 10 may be a conical structure. The contact housing 10 may be made of a metal material, such as steel. When the detection device 1 is inserted into the slot A11 of the main shaft A10, the contact housing 10 contacts the slot A11.

[0059] The contact housing 10 may have a tip 11 and a coupling end 12. The contact housing 10 may gradually narrow from the coupling end 12 to the tip 11. The contact housing 10 may extend along a central axis AX1 and may rotate around the central axis AX1. In other words, the central axis AX1 may pass through the center of the contact housing 10. In addition, the central axis AX1 may pass through the centers of the tip 11 and the coupling end 12.

[0060] The contact shell 10 may be a hollow structure. The contact shell 10 may have an outer surface 13, an extension surface 14 and a first cavity 15. The shape of the outer surface 13 matches the shape of the connecting surface A12. When the detection device 1 is inserted into the slot A11 of the main shaft A10, the outer surface 13 contacts the connecting surface A12. In this embodiment, the connecting surface A12 and the outer surface 13 may be tapered. The diameter of the outer surface 13 may gradually shorten from the coupling end 12 to the tip 11. The extension surface 14 is connected to the outer surface 13. The extension surface 14 may be an annular surface and may be a cylindrical shape. The extension surface 14 may extend along an extension direction D1. When the detection device 1 is inserted into the slot A11 of the main shaft A10, the extension surface 14 is located outside the slot A11.

[0061] The first cavity 15 may have an inner surface 151. The first cavity 15 and the inner surface 151 may be cylindrical and may extend along the extension direction D1. The central axis AX1 may pass through the center of the first cavity 15. In this embodiment, the outer surface 13 and the extension surface 14 may surround the first cavity 15.

[0062] The snap-fit ​​element 20 is disposed at the tip 11 of the contact housing 10. When the contact housing 10 is inserted into the slot A11 of the spindle A10, the snap-fit ​​element 20 is snap-fitted into the slot A11. In the present embodiment, the spindle A10 has a fastening element A13, and the snap-fit ​​element 20 has a fastening groove 21. When the contact housing 10 is inserted into the slot A11 of the spindle A10, the fastening element A13 is located in the fastening groove 21. By means of the fastening element 20 and the fastening element A13, the detection device 1 is detachably disposed on the spindle A10. In addition, the fastening element A13 can provide a pulling force to the snap-fit ​​element 20, so that the outer surface 13 can be tightly attached to the connecting surface A12.

[0063] The limiting element 30 is disposed on the contact housing 10. In the present embodiment, the limiting element 30 may surround and be connected to the extension surface 14. The limiting element 30 may be a cylindrical structure. In the present embodiment, the limiting element 30 may include a limiting groove 31. When the contact housing 10 is inserted into the slot A11 of the spindle A10, the limiting element 30 abuts against the spindle A10, and a portion of the spindle A10 may be located in the limiting groove 31 to limit the rotation between the detection device 1 and the spindle A10.

[0064] The contact housing 10 , the locking element 20 and / or the limiting element 30 of the detection device 1 may correspond to the contact housing 10 , the locking element 20 and / or the limiting element 30 of a tool.

[0065] The main housing 40 is disposed at the joint end 12 connected to the contact housing 10. The main housing 40 may extend along the extension direction D1. The main housing 40 may be a hollow structure. The main housing 40 may have a second cavity 41 connected to the first cavity 15. The first cavity 15 may be cylindrical, and the central axis AX1 may pass through the center of the first cavity 15.

[0066] Figure 3 1 is a bottom view of the contact housing 10 and the sensing element 50 of the present invention according to some embodiments. The sensing element 50 is disposed in the first cavity 15 and connected to the inner surface 151. The sensing element 50 is a long strip structure and extends along an annular path P1. In this embodiment, there are a plurality of sensing elements 50 and they are arranged at intervals along the annular path. The annular path P1 can be located on a plane perpendicular to the central axis AX1.

[0067] exist Figure 3In the figure, six sensing elements 50 are drawn, but the number of sensing elements 50 is not limited. The detection device 1 may have one sensing element 50 or more than one sensing element 50. In some embodiments, the sensing element 50 may be a ring structure extending along the ring path P1. The detection device 1 may have two or more than three sensing elements 50.

[0068] In this embodiment, the sensing element 50 is adjacent to the coupling end 12. However, the position of the sensing element 50 on the inner surface 151 is not limited. In some embodiments, the sensing element 50 is adjacent to the tip 11. In some embodiments, the sensing element 50 is located between the tip 11 and the coupling end 12. In some embodiments, the detection device 1 may include a plurality of sensing elements 50 arranged on the inner surface 151 along the extension direction D1.

[0069] The processing module 60 is disposed in the second cavity 41 and is electrically connected to the sensing element 50. In some embodiments, the processing module 60 may include a processor (process chip) and a circuit board. The processor may be disposed on the circuit board. When the contact housing 10 is inserted into the slot A11 of the spindle A10, the sensing element 50 is used to detect a strain of the contact housing 10 and generate a detection signal. The processing module 60 generates a determination signal based on the detection signal.

[0070] In this embodiment, when the contact housing 10 is inserted into the slot A11 of the main shaft A10, the fastening element A13 applies a pulling force to the buckling element 20, so that the outer surface 13 abuts against the connecting surface A12 of the slot A11, and then causes the contact housing 10 to deform. Since the sensing element 50 is fixed to the inner surface 151 of the contact housing 10, the deformation of the contact housing 10 will cause the deformation of the sensing element 50. In this embodiment, the sensing element 50 can be a strain sensor. The deformation of the contact housing 10 can cause the length of the sensing element 50 to change, and the change in the length of the sensing element 50 will cause the resistance value of the sensing element 50 to change. Therefore, the strain of the contact housing 10 can be derived by detecting the resistance value of the sensing element 50. In other words, the detection signal can correspond to the resistance value of the sensing element 50. The processing module 60 can deduce the strain of the contact housing 10 based on the resistance value of the sensing element 50 and generate a judgment signal.

[0071] exist Figure 1 In the embodiment, the spindle A10 is in a good state. There is no debris M1 between the connection surface A12 of the slot A11 and the outer surface 13 of the contact housing 10. In addition, the connection surface A12 of the slot A11 can be well attached to the outer surface 13. At this time, a rotation axis AX2 of the spindle A10 coincides with the central axis AX1 of the detection device 1, so the spindle A10 can stably drive the detection device 1 to rotate around the rotation axis AX2.

[0072] Figure 4 FIG. 1 is a schematic diagram of the detection device 1 of the present invention during a detection process. Figure 4 In the example, spindle A10 is in a bad state. Figure 4 As shown, when a debris M1 is attached to the connection surface A12 of the slot A11 of the spindle A10, the detection device 1 is tilted relative to the slot A11, and a portion of the outer surface 13 is separated from the connection surface A12. In other words, the central axis AX1 of the detection device 1 is tilted relative to the rotation axis AX2 of the spindle A10. In some embodiments, when the connection surface A12 of the slot A11 of the spindle A10 is worn, or the connection surface A12 itself has defects, it may also cause a portion of the outer surface 13 to separate from the connection surface A12, or the central axis AX1 of the detection device 1 may be tilted relative to the rotation axis AX2 of the spindle A10.

[0073] In this embodiment, when part of the outer surface 13 is separated from the connecting surface A12, Figure 4 The tension of the fixing element A13 causes the deformation of the contact housing 10 to be different from Figure 1 The tension of the fixing element A13 causes the deformation of the contact housing 10. In addition, Figure 4 The resistance value of the sensing element 50 is different from Figure 1 Therefore, the processing module 60 can determine the state (eg, good state or bad state) of the spindle A10 according to the resistance value (detection signal) of the sensing element 50.

[0074] Generally speaking, when the volume or number of debris M1 is larger, or the defect of the connection surface A12 is larger, the angle between the central axis AX1 of the detection device 1 and the rotation axis AX2 of the spindle A10 will be larger, or the contact ratio between the outer surface 13 and the connection surface A12 will be smaller. At this time, if a tool is installed on the spindle A10, and the spindle A10 rotates the tool, the vibration generated by the tool will be greater, thereby causing the tool to be unable to correctly process the target object, or causing damage to the spindle A10.

[0075] In this embodiment, in order to accurately measure the state of the spindle A10. The processing module 60 can obtain a contact rate based on the detection signal and a quantitative data, and the judgment signal may include the above contact rate. The above contact rate corresponds to the contact area between the outer surface 13 and the connection surface A12. In this embodiment, the contact rate may be the ratio of the contact area to the outer surface 13. For example, when the contact rate is 100%, it means that the outer surface 13 is completely in contact with the connection surface A12. When the contact rate is 80%, it may represent that 20% of the area of ​​the outer surface 13 is not in contact with the connection surface A12. When the contact rate is 60%, it may represent that 40% of the area of ​​the outer surface 13 is not in contact with the connection surface A12.

[0076] For example, when the spindle A10 is in a good condition, the central axis AX1 may coincide with the rotation axis AX2. The contact rate may be within a good range. The good range may be between 75% and 100%. When the spindle A10 is in a normal range, the contact rate may be within an acceptable range. The acceptable range may be between 50% and 100%. When the spindle A10 is in a good condition or an acceptable condition, the user may not need to repair or clean the spindle A10.

[0077] For example, when the spindle A10 is in a bad state, the central axis AX1 is tilted relative to the rotation axis AX2. The contact rate may be within a bad range. The bad range may be less than 50%. The user should repair or clean the spindle A10 as soon as possible.

[0078] In some embodiments, the quantitative data can be obtained by measurement. First, the user can prepare contact shells (such as a first contact shell, a second contact shell, a third contact shell, a fourth contact shell, and a fifth contact shell) with different contact rates with the connection surface A12 of the main axis A10. In some embodiments, the contact shell used for the quantitative data can be a standard part. For example, the user can prepare a first contact shell with a first contact rate (such as 100% contact rate) with the connection surface A12 of the main axis A10, a second contact shell with a second contact rate (such as 75% contact rate), a third contact shell with a third contact rate (such as 50% contact rate), a fourth contact shell with a fourth contact rate (such as 25% contact rate), and a fifth contact shell with a fifth contact rate (such as 0% contact rate).

[0079] Then, the detection device 1 having a first contact shell is inserted into the slot A11 for measurement, and the first resistance value (or first strain value) of the sensing element 50 is obtained. The detection device 1 having a second contact shell is inserted into the slot A11 for measurement, and the second resistance value (or second strain value) of the sensing element 50 is obtained. The detection device 1 having a third contact shell is inserted into the slot A11 for measurement, and the third resistance value (or third strain value) of the sensing element 50 is obtained. The detection device 1 having a fourth contact shell is inserted into the slot A11 for measurement, and the fourth resistance value (or fourth strain value) of the sensing element 50 is obtained. The detection device 1 having a fifth contact shell is inserted into the slot A11 for measurement, and the fifth resistance value (or fifth strain value) of the sensing element 50 is obtained.

[0080] In this embodiment, a quantitative data can be formed by the first resistance value (first strain amount) corresponding to the first contact rate, the second resistance value (second strain amount) corresponding to the second contact rate, the third resistance value (third strain amount) corresponding to the third contact rate, the fourth resistance value (fourth strain amount) corresponding to the fourth contact rate, and the fifth resistance value (fifth strain amount) corresponding to the fifth contact rate.

[0081] Therefore, when the user actually uses the detection device 1 to detect a spindle A10, the resistance value (or strain amount) corresponding to the detection signal is compared with the first to fifth resistance values ​​(or strain amounts) of the above-mentioned quantitative data, and the contact rate between the outer surface 13 of the contact housing 10 and the connecting surface A12 of the spindle A10 can be calculated.

[0082] In some embodiments, the quantitative data obtained by the above measurement can form a formula. The quantitative data can be obtained through a formula of the resistivity (or strain) and contact rate of the sensing element 50. The contact rates are equivalent values ​​of the strains. In some embodiments, the resistivity (or strain) of the sensing element 50 can be proportional to the contact rate.

[0083] In some embodiments, the quantitative data may be formed by at least two groups of contact shells with different contact rates and their corresponding resistance values ​​(strain amounts).

[0084] Accordingly, when the processing module 60 analyzes the detection signal, the resistivity (or strain) of the sensing element 50 can be obtained. The processing module 60 then compares the resistivity of the sensing element 50 with the quantitative data to deduce the contact ratio between the outer surface 13 of the contact housing 10 and the connecting surface A12 of the main shaft A10.

[0085] In some embodiments, the judgment signal also includes a judgment value. The processing module 60 can generate the above judgment value based on the contact rate. For example, the above judgment value corresponds to a good state, an acceptable state, or a bad state of the spindle A10. When the contact rate is above 75%, the judgment value can be 1, and corresponds to a good state of the spindle A10. When the contact rate is above 50% and less than 75%, the judgment value can be 2, and corresponds to an acceptable state of the spindle A10. When the contact rate is less than 50%, the judgment value can be 3, and corresponds to a bad state of the spindle A10.

[0086] For example, Figure 5As shown, the first contact rate is 100%, and the measured strain is 82.72με; the second contact rate is 75%, and the measured strain is 64.74με; the third contact rate is 50%, and the measured strain is 42.83με; the fourth contact rate is 25%, and the measured strain is 21.22με; and the fifth contact rate is 0%, and the measured strain is 1.31με. Through the above values, a formula is obtained:

[0087] y=0.8254x+1.296

[0088] The strain of the spindle can be measured by the detection device 1, and the processing module 60 calculates the current contact rate of the spindle through the formula obtained by the quantitative data. For example, if the strain of the spindle measured by the detection device 1 is 77.65με, the processing module 60 calculates the contact rate to be 92.51%.

[0089] like Figure 1 and Figure 2 As shown, the detection device 1 may also include a display module 70 and a wireless transmission module 80. The display module 70 is electrically connected to the processing module 60 and is used to display a display signal corresponding to the judgment signal. In some embodiments, the display module 70 may include a display panel 71. The display panel 71 can be used to display a display screen corresponding to the judgment signal. In some embodiments, the display module 70 may include a display device. The display module 70 can be used to display a display screen corresponding to the judgment signal. The above display screen can display the contact rate between the outer surface 13 of the contact housing 10 and the connection surface A12 of the main shaft A10.

[0090] In some embodiments, the display module 70 may include a plurality of judgment lights 72. The display module 70 may activate or deactivate at least one judgment light 72 according to the judgment value of the judgment signal. The judgment lights 72 may correspond to a good state, a fair state, or a bad state of the spindle A10. Therefore, through the display module 70, the user may know the state of the spindle A10 in a timely manner and may determine whether to repair or clean the spindle A10.

[0091] The wireless transmission module 80 is electrically connected to the processing module 60 and is used to transmit the judgment signal in a wireless manner. For example, the wireless transmission module 80 can generate a wireless signal corresponding to the judgment signal. An external terminal device (not shown) can receive the wireless signal. In some embodiments, the external terminal device can be a computer, a server, or a mobile electronic device. Therefore, through the wireless transmission module 80, the user can record and analyze the spindle A10 of different machine tools A1 on the external terminal device.

[0092] In summary, the detection device of the present invention can detect the spindle of the machine tool in real time, thereby reducing the probability of spindle damage or improving the yield rate of the products produced by the machine tool.

[0093] Although the present invention is disclosed in conjunction with the above various embodiments, they are only exemplary references and are not intended to limit the scope of the present invention. Anyone familiar with the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the above embodiments are not intended to limit the scope of the present invention, and the scope of protection of the present invention shall be subject to the definition of the attached claims.

Claims

1. A detection device for a spindle of a machine tool, characterized in that: The spindle includes a slot having a connection surface, and the detection device includes: A contact housing having a first cavity and an outer surface, wherein the first cavity has an inner surface; A main housing connected to the contact housing and having a second cavity communicating with the first cavity; A sensing element is disposed in the first cavity and connected to the inner surface; and A processing module is disposed in the second cavity and electrically connected to the sensing element. When the contact housing is inserted into the slot of the spindle, the sensing element is used to detect the strain of the contact housing and generate a detection signal, and the processing module generates a judgment signal according to the detection signal. The processing module obtains a contact rate according to the detection signal and the quantitative data, wherein the contact rate corresponds to a contact area between the outer surface and the connection surface, and the contact rate is an equivalent value of the strain amount. The quantitative data is obtained according to the following method: Inserting a first detection device having a first contact housing into the main shaft, and detecting the first contact housing through a sensing element of the first detection device to obtain a first strain, wherein a connection surface between the first contact housing and the main shaft has a first contact ratio; Inserting a second detection device having a second contact housing into the main shaft, and detecting the second contact housing through a sensing element of the second detection device to obtain a second strain, wherein a connection surface between the first contact housing and the main shaft has a second contact ratio; and The quantitative data is formed according to the first contact rate, the first strain amount, the second contact rate, and the second strain amount. 2 . The detection device for a spindle of a machine tool as claimed in claim 1 , wherein the contact housing is a conical structure. 3 . The detection device for a spindle of a machine tool as claimed in claim 1 , wherein when the contact housing is inserted into the slot of the spindle, the outer surface contacts the connection surface. 4 . The detection device for a spindle of a machine tool as claimed in claim 3 , wherein the connecting surface and the outer surface are conical. 5 . The detection device for a spindle of a machine tool as claimed in claim 1 , further comprising a display module electrically connected to the processing module and configured to display a display signal corresponding to the determination signal. 6 . The detection device for a spindle of a machine tool as claimed in claim 1 , further comprising a wireless transmission module electrically connected to the processing module and transmitting the determination signal wirelessly.

7. The detection device for a spindle of a machine tool as claimed in claim 1, further comprising a locking element disposed on the contact housing, wherein when the contact housing is inserted into the slot of the spindle, the locking element is locked in the slot. 8 . The detection device for a spindle of a machine tool as claimed in claim 1 , wherein the sensing element is a strain sensor, and a resistance value of the sensing element corresponds to the strain amount. 9 . The detection device for a spindle of a machine tool as claimed in claim 1 , wherein the sensing element is a long strip structure and extends along a circular path.

10. A method for detecting a spindle of a machine tool, comprising: Inserting the detection device into the spindle of the machine tool; The sensing element of the detection device detects the strain of the contact housing of the detection device and generates a detection signal, wherein the contact housing has a first cavity, the first cavity has an inner surface, and the sensing element is disposed in the first cavity and connected to the inner surface; as well as The contact rate is obtained by a processing module according to the detection signal and the quantitative data, wherein the contact rate is an equivalent value of the strain amount. The quantitative data is obtained according to the following method: Inserting a first detection device having a first contact housing into the main shaft, and detecting the first contact housing through a sensing element of the first detection device to obtain a first strain, wherein a connection surface between the first contact housing and the main shaft has a first contact ratio; Inserting a second detection device having a second contact housing into the main shaft, and detecting the second contact housing through a sensing element of the second detection device to obtain a second strain, wherein a connection surface between the first contact housing and the main shaft has a second contact ratio; and The quantitative data is formed according to the first contact rate, the first strain amount, the second contact rate, and the second strain amount. 11 . The detection method of a spindle of a machine tool as claimed in claim 10 , wherein the processing module obtains a determination signal according to the contact rate.

12. The detection method for the spindle of a machine tool as described in claim 10, wherein the detection device further comprises a main housing connected to the contact housing and having a second cavity connected to the first cavity, wherein the processing module is disposed in the second cavity and electrically connected to the sensing element.

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