Stress detection device and tool holder

Abstract

The utility model relates to a stress detection device and a knife handle, a central axis is defined, the stress detection device comprises a main body, a stress sensing module, an inner cylinder, a circuit board assembly and a packaging material, and the outer ring surface of the main body is recessed to form an annular accommodating groove; the stress sensing module comprises a plurality of stress sensing units, each stress sensing unit comprises two strain sensing elements, and the two strain sensing elements are symmetrically arranged in the annular accommodating groove by taking the central axis as the center; the inner cylinder is arranged in the hollow part and is provided with an accommodating space; the circuit board assembly is arranged in the containing space and comprises a control module and a wireless transmission module, and the control module is electrically connected with the stress sensing module and the wireless transmission module. The control module receives at least one sensing signal of the stress sensing module so as to send the at least one sensing signal through the wireless transmission module.

Description

Technical Field

[0001] The present utility model relates to a tool handle; in particular, it relates to a tool handle with a force detection device. Background Art

[0002] It is known that the tool handle plays an important role in the production process of precision parts. The tool handle is used to connect the spindle of a processing machine and a tool, so that the rotational power of the spindle can be transmitted to the tool through the tool handle to perform the cutting process. When the tool cuts an object, due to the vibration generated by the operation of the processing machine, and when the tool contacts the uneven surface of the object, real-time stress changes occur to the tool and the tool handle, which easily affects the accuracy of the tool handle driving the tool to perform cutting, and even reduces the service life of the tool handle and the tool.

[0003] In addition, when the types of objects to be cut are different, corresponding tools need to be replaced for cutting. At this time, the force on the tool handle will also change accordingly. Or, even for tools of the same specification, there may be quality differences, resulting in uneven force on the tool handle, which will also affect the cutting accuracy and service life of the tool handle. Coupled with the fact that the above situations are difficult for on-site operators to judge in real time, therefore, how to provide real-time monitoring information corresponding to the force situation is actually the current technical topic focused on by the related industries. Summary of the Utility Model

[0004] In view of this, the purpose of the present utility model is to provide a force detection device and a tool handle that can sense the force situation in real time and generate corresponding sensing signals.

[0005] To achieve the above purpose, the present utility model provides a force detection device, which defines a central axis; the force detection device includes a main body, a force sensing module, an inner cylinder, a circuit board assembly and a packaging material. The main body is cylindrical and has a hollow part, and an annular accommodation groove is recessed on an outer ring surface of the main body; the force sensing module includes a plurality of force sensing units, and each force sensing unit includes two strain sensing elements. The two strain sensing elements of each force sensing unit are symmetrically arranged in the annular accommodation groove of the main body with the central axis as the center; the inner cylinder is arranged in the hollow part of the main body, and the inner cylinder has an accommodation space; the circuit board assembly is arranged in the accommodation space, and the circuit board assembly includes a control module and a wireless transmission module. The control module is electrically connected to the force sensing module and the wireless transmission module. The control module receives at least one sensing signal of the force sensing module and sends at least one sensing signal of the force sensing module through the wireless transmission module; the packaging material is arranged in the annular accommodation groove of the main body and covers the force sensing module.

[0006] Wherein, the circuit board assembly includes a first circuit board and a second circuit board. The first circuit board is electrically connected to the second circuit board. The control module and the wireless transmission module are disposed on the first circuit board. A power control module is disposed on the second circuit board. The power control module is used to connect to a battery module to supply power to the control module and the wireless transmission module.

[0007] Wherein, the accommodating space has a first accommodating chamber, a second accommodating chamber and a third accommodating chamber. The first accommodating chamber and the third accommodating chamber are respectively located on opposite sides of the second accommodating chamber and communicate with the second accommodating chamber. The circuit board assembly is disposed in the second accommodating chamber. The battery module includes two batteries, and the two batteries are respectively disposed in the first accommodating chamber and the third accommodating chamber.

[0008] Wherein, the main body has a first light-transmitting hole, and the inner cylinder has a second light-transmitting hole. The circuit board assembly includes a light-emitting element. The first light-transmitting hole and the second light-transmitting hole correspond to the light-emitting element, and the light emitted by the light-emitting element passes through the first light-transmitting hole and the second light-transmitting hole.

[0009] Wherein, it includes a plurality of counterweight blocks. One end of the main body has a plurality of jacks, and each counterweight block is embedded in each jack.

[0010] Wherein, the plurality of force-sensing units include a first force-sensing unit and a second force-sensing unit. The first force-sensing unit is used to sense the force in the direction along a first axis, and the first axis is perpendicular to the central axis. The two strain-sensing elements of the first force-sensing unit are two first strain-sensing elements, and the two first strain-sensing elements are symmetrically disposed along the first axis; the second force-sensing unit is used to sense the force in the direction along a second axis, and the second axis is perpendicular to the central axis and the first axis. The two strain-sensing elements of the second force-sensing unit are two second strain-sensing elements, and the two second strain-sensing elements are symmetrically disposed along the second axis.

[0011] Wherein, each of the first strain-sensing elements includes two first strain-sensing structures. The first strain-sensing structures of the two first strain-sensing elements are electrically connected to form a first Wheatstone bridge. The first Wheatstone bridge has a first arm and a second arm. The two first strain-sensing structures of one of the first strain-sensing elements are respectively located on an upper arm of the first arm and a lower arm of the second arm; the two first strain-sensing structures of the other first strain-sensing element are respectively located on a lower arm of the first arm and an upper arm of the second arm.

[0012] Among them, each of the second strain sensing elements includes two second strain sensing structures, and the second strain sensing structures of the two second strain sensing elements are electrically connected to form a second Wheatstone bridge. The second Wheatstone bridge has a first arm and a second arm. The two second strain sensing structures of one of the second strain sensing elements are respectively located on an upper arm of the first arm of the second Wheatstone bridge and a lower arm of the second arm of the second Wheatstone bridge; the two second strain sensing structures of the other second strain sensing element are respectively located on a lower arm of the first arm of the second Wheatstone bridge and an upper arm of the second arm of the second Wheatstone bridge.

[0013] Among them, the plurality of force sensing units includes a tensile force sensing unit. The two strain sensing elements of the tensile force sensing unit are two tensile force sensing elements, and the two tensile force sensing elements are symmetrically arranged around the central axis in the annular accommodation groove of the main body.

[0014] Among them, the plurality of force sensing units includes a torque sensing unit. The two strain sensing elements of the torque sensing unit are two torque sensing elements, and the two torque sensing elements are symmetrically arranged around the central axis in the annular accommodation groove of the main body.

[0015] Among them, an antenna is included, which is arranged in the annular accommodation groove, and the antenna is electrically connected to the wireless transmission module; the encapsulating material covers the antenna.

[0016] Among them, the main body has at least one first coupling hole, the inner cylinder has at least one second coupling hole, and the position of the at least one second coupling hole corresponds to the position of the at least one first coupling hole.

[0017] The present utility model further provides a tool handle for connecting a machining spindle and a tool; the tool handle includes the force detection device, a tool head and a chuck. The tool head is used for connecting the machining spindle, and the tool head is connected to one end of the main body; the chuck is used for connecting the tool, and the chuck is connected to the other end of the main body.

[0018] The effect of the present utility model is that through the force sensing module arranged on the main body, the force detection device and the tool handle can convert the real-time force change into the corresponding at least one sensing signal. Then, in cooperation with the circuit board assembly arranged in the inner cylinder, the control module receives the at least one sensing signal and sends the at least one sensing signal of the force sensing module through the wireless transmission module, so that the operator can receive the at least one sensing signal in real time through an external electronic device, so as to achieve the purpose of effectively monitoring and analyzing the real-time working condition. Description of the Drawings

[0019] Figure 1Stereogram of the handle of a preferred embodiment of the present utility model.

[0020] Figure 2 Schematic diagram of some components of the above preferred embodiment.

[0021] Figure 3 For Figure 2 Exploded view of some components shown.

[0022] Figure 4 Stereogram of some components of the above preferred embodiment from another perspective.

[0023] Figure 5 For Figure 4 Cross-sectional view in the 5-5 direction of

[0024] Figure 6 Schematic diagram of the inner cylinder and the circuit board assembly of the above preferred embodiment.

[0025] Figure 7 For Figure 2 Cross-sectional view in the 7-7 direction of

[0026] Figure 8 Schematic diagram of some components of the above preferred embodiment, showing the configuration of the force sensing module.

[0027] Figure 9 Schematic diagram of the first force sensing unit of the above preferred embodiment.

[0028] Figure 10 Circuit diagram of the first force sensing unit of the above preferred embodiment.

[0029] Figure 11 Schematic diagram of the second force sensing unit of the above preferred embodiment.

[0030] Figure 12 Circuit diagram of the second force sensing unit of the above preferred embodiment.

[0031] Figure 13 Schematic diagram of the tensile force sensing unit of the above preferred embodiment.

[0032] Figure 14 Circuit diagram of the tensile force sensing unit of the above preferred embodiment.

[0033] Figure 15 Schematic diagram of the torque sensing unit of the above preferred embodiment.

[0034] Figure 16 Circuit diagram of the torque sensing unit of the above preferred embodiment.

[0035] Figure 17 Schematic diagram of the first circuit board of the above preferred embodiment.

[0036] Figure 18 Schematic diagram of the second circuit board of the above preferred embodiment.

[0037] Description of reference numerals:

[0038] 100: Force detection device

[0039] 10: Main body

[0040] 11: Hollow part

[0041] 11a: First opening

[0042] 11b: Second opening

[0043] 12: Outer ring surface

[0044] 12a: Annular accommodation groove

[0045] 12b: Wire threading groove

[0046] 13: Jack

[0047] 14: First coupling hole

[0048] 15: First light-transmitting hole

[0049] 16: First wire threading hole

[0050] 20: Counterweight

[0051] 30: Force sensing module

[0052] 32: First force sensing unit

[0053] 321: First strain sensing element

[0054] 321a: First flexible substrate

[0055] R1, R2, R3, R4: First strain sensing structure

[0056] 34: Second force sensing unit

[0057] 341: Second strain sensing element

[0058] 341a: Second flexible substrate

[0059] R5, R6, R7, R8: Second strain sensing structure

[0060] 36: Tensile force sensing unit

[0061] 361: Tensile force sensing element

[0062] 361a: Third flexible substrate

[0063] R9, R10, R11, R12: Tensile sensing structure

[0064] 38: Torque sensing unit

[0065] 381: Torque sensing element

[0066] 381a: Fourth flexible substrate

[0067] R13, R14, R15, R16: Torque sensing structure

[0068] 40: Inner cylinder

[0069] 40a: End cap

[0070] 40a1: Third through hole

[0071] 41: Accommodating space

[0072] 411: First chamber

[0073] 412: Second chamber

[0074] 413: Third chamber

[0075] 41a: Third opening

[0076] 41b: Fourth opening

[0077] 42: Second wire passing hole

[0078] 43: Second coupling hole

[0079] 44: Second light transmitting hole

[0080] 50: Circuit board assembly

[0081] 51: First circuit board

[0082] 511: First connector

[0083] 52: Second circuit board

[0084] 521: Second connector

[0085] 53: Power control module

[0086] 54: Light emitting element

[0087] 55: Wireless transmission module

[0088] 56: Vibration sensing module

[0089] 57: Control module

[0090] 571: Analog / digital signal converter

[0091] 572: Controller

[0092] 60: Battery module

[0093] 61: Battery

[0094] 70: Antenna

[0095] 80: Encapsulating material

[0096] 90: Flow guide tube

[0097] 200: Tool head

[0098] 200a: First through hole

[0099] 300: Chuck

[0100] 300a: Second through hole

[0101] 1: Tool handle

[0102] 2: Tool

[0103] A: Central axis

[0104] L1: First axis

[0105] L2: Second axis

[0106] V S1 : First sensing signal

[0107] V S2 : Second sensing signal

[0108] V S3 : Third sensing signal

[0109] V S4 : Fourth sensing signal

[0110] V i : Input voltage Detailed implementation manners

[0111] To more clearly illustrate the present utility model, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. Please refer to Figures 1 to 5Shown is a tool shank 1 according to a preferred embodiment of the present utility model. The tool shank 1 includes a tool head 200, a chuck 300, and a force detection device 100. The tool head 200 has a first through hole 200a communicating with two ends of the tool head 200. The tool head 200 is used to connect a machining spindle (not shown in the figure), and the tool head 200 is connected to one end of the force detection device 100. The chuck 300 has a second through hole 300a communicating with two ends of the chuck 300. The chuck 300 is used to connect a tool 2, and the chuck 300 is connected to the other end of the force detection device 100. In this embodiment, the tool shank 1 is taken as a rotary tool shank for example.

[0112] The force detection device 100 defines a central axis A. The force detection device 100 includes a main body 10, a plurality of counterweight blocks 20, a force sensing module 30, an inner cylinder 40, a circuit board assembly 50, and a packaging material 80.

[0113] One end of the main body 10 is connected to the tool head 200 along the central axis A, and the other end of the main body 10 is connected to the chuck 300 along the central axis A. The main body 10 is cylindrical and has a hollow portion 11. The hollow portion 11 communicates with two ends of the main body 10 along the central axis A and forms a first opening 11a and a second opening 11b respectively. The first opening 11a communicates with the first through hole 200a of the tool head 200, and the second opening 11b communicates with the second through hole 300a of the chuck 300. An annular accommodation groove 12a and a plurality of wire grooves 12b are recessed on an outer ring surface 12 of the main body 10. The plurality of wire grooves 12b communicate with the annular accommodation groove 12a. The main body 10 has a plurality of first wire holes 16, a plurality of jacks 13, at least one first coupling hole 14, and a first light transmission hole 15. Each of the first wire holes 16 is disposed in each of the wire grooves 12b and communicates with the hollow portion 11. The plurality of jacks 13 are located around the second opening 11b for the plurality of counterweight blocks 20 to be correspondingly embedded; the at least one first coupling hole 14 communicates with the hollow portion 11 and is used to couple the inner cylinder 40; the first light transmission hole 15 communicates with the hollow portion 11 and is used to couple a light guide column (not shown in the figure) for light to pass through; in this embodiment, the material of the main body 10 is metal; the number of the plurality of jacks 13 corresponds to the number of the plurality of counterweight blocks 20, and the number of the plurality of jacks 13 and the number of the plurality of counterweight blocks 20 can be set according to requirements to achieve the effect of dynamic balance counterweight.

[0114] As Figures 8 to 16 shown, the force sensing module 30 is used to sense the force on the tool shank 1 to output at least one sensing signal. In this embodiment, the at least one sensing signal is multiple and includes a first sensing signal V S1, a second sensing signal V S2 , a third sensing signal V S3 and a fourth sensing signal V S4 . The force sensing module 30 includes a plurality of force sensing units. Each of the force sensing units includes two strain sensing elements. In this embodiment, each of the strain sensing elements includes a flexible substrate and a strain sensing structure disposed on the flexible substrate, as shown in Figure 3 and Figure 4 . The plurality of strain sensing elements are disposed in the annular accommodation groove 12a, and each of the strain sensing elements is adhered to the groove surface of the annular accommodation groove 12a. The plurality of strain sensing elements are connected by a flexible circuit board (Flexure circuit board, FPC) and a plurality of wires (not shown in the figure), and the plurality of wires pass through the plurality of first wire passing holes 16 to transmit the plurality of sensing signals. The plurality of force sensing units include a first force sensing unit 32, a second force sensing unit 34, a tension sensing unit 36, and a torsion sensing unit 38.

[0115] The first force sensing unit 32 is configured to sense the force on the knife handle 1 in the direction of a first axis L1 to output the corresponding first sensing signal V S1 . The first axis L1 is perpendicular to the central axis A. The two strain sensing elements of the first force sensing unit 32 are two first strain sensing elements 321. The two first strain sensing elements 321 are symmetrically disposed in the annular accommodation groove 12a along the first axis L1. Each of the first strain sensing elements 321 includes a first flexible substrate 321a and two first strain sensing structures R1 to R4 disposed on the first flexible substrate 321a. Each of the first strain sensing structures R1 to R4 has a resistance value, so that the first force sensing unit 32 can be connected through the circuit of the flexible circuit board as shown in Figure 10The structure of the Wheatstone bridge shown (i.e., the first Wheatstone bridge), where the first Wheatstone bridge has a first arm and a second arm, and the two first strain sensing structures R3 and R4 of one of the first strain sensing elements 321 are respectively located on an upper arm of the first arm and a lower arm of the second arm; the two first strain sensing structures R1 and R2 of the other first strain sensing element 321 are respectively located on a lower arm of the first arm and an upper arm of the second arm. When the handle 1 is subjected to stress along the first axis L1, the resistance values of the first strain sensing structures R1 to R4 change correspondingly. Among them, when one side of the handle 1 along the first axis L1 is compressed and the other side is relatively stretched, the resistance value of one of the first strain sensing elements 321 on the compressed side is less than the resistance value of the other first strain sensing element 321, so as to generate the corresponding first sensing signal V S1 , when the handle 1 is subjected to greater stress along the first axis L1, the first sensing signal V S1 . Since it is the relative change in the resistance values on the two first strain sensing elements 321 (i.e., the resistance values of the two first strain sensing structures R1, R2 or R3, R4 on one first strain sensing element 321 increase, and the resistance values of the two first strain sensing structures R3, R4 or R1, R2 on the other first strain sensing element 321 decrease), the structure of the Wheatstone bridge can be used to increase the first sensing signal V S1 , that is, effectively increase the first sensing signal V S1 .

[0116] The second force sensing unit 34 is used to sense the force on the handle 1 in the direction of a second axis L2 to output the corresponding second sensing signal V S2 . The second axis L2 is perpendicular to the central axis A and the first axis L1. The two strain sensing elements of the second force sensing unit 34 are two second strain sensing elements 341. The two second strain sensing elements 341 are symmetrically arranged along the second axis L2 in the annular accommodating groove 12a. Each second strain sensing element 341 includes a second flexible substrate 341a and two second strain sensing structures R5 to R8 arranged on the second flexible substrate 341a. Each of the second strain sensing structures R5 to R8 has a resistance value, so that the second force sensing unit 34 can be connected through the circuit of the flexible circuit board as Figure 12The structure of the Wheatstone bridge shown (i.e., the second Wheatstone bridge), wherein the second Wheatstone bridge has a first arm and a second arm, and the two second strain sensing structures R7 and R8 of one of the second strain sensing elements 341 are respectively located on an upper arm of the first arm of the second Wheatstone bridge and a lower arm of the second arm of the second Wheatstone bridge; the two second strain sensing structures R5 and R6 of the other second strain sensing element 341 are respectively located on a lower arm of the first arm of the second Wheatstone bridge and an upper arm of the second arm of the second Wheatstone bridge. When the tool handle 1 is subjected to stress along the second axis L2, the resistance values of the second strain sensing structures R5 to R8 change correspondingly. Among them, when one side of the tool handle 1 along the second axis L2 is compressed and the other side is relatively stretched, the resistance value of one of the second strain sensing elements 341 on the compressed side is less than the resistance value of the other second strain sensing element 341, so as to generate the corresponding second sensing signal V S2 , in addition, when the tool handle 1 is subjected to greater stress along the second axis L2, the second sensing signal V S2 has a greater absolute value. Since it is the relative change in the resistance values on two second strain sensing elements 341 (i.e., the resistance values of the two second strain sensing structures R5, R6 or R7, R8 on one second strain sensing element 341 increase, and the resistance values of the two second strain sensing structures R7, R8 or R5, R6 on the other second strain sensing element 341 decrease), the structure of the Wheatstone bridge can be used to increase the second sensing signal V S2 , that is, effectively increase the second sensing signal V S2 sensitivity.

[0117] The tensile force sensing unit 36 is used to sense the tensile force on the tool handle 1 in the direction of the central axis A to output the corresponding third sensing signal V S3 , the two strain sensing elements of the tensile force sensing unit 36 are two tensile force sensing elements 361, the two tensile force sensing elements 361 are symmetrically arranged in the annular accommodating groove 12a of the main body 10 with the central axis A as the center, each tensile force sensing element 361 is located between each first strain sensing element 321 and each second strain sensing element 341, and each tensile force sensing element 361 includes a third flexible substrate 361a and two tensile force sensing structures R9 to R12 arranged on the third flexible substrate 361a, and each of the tensile force sensing structures R9 to R12 has a resistance value, so that the tensile force sensing unit 36 can be connected through the circuit of the flexible circuit board as Figure 14The structure of the Wheatstone bridge shown (i.e., the third Wheatstone bridge), wherein two tensile sensing structures R11 and R12 of one of the tensile sensing elements 361 are located on the upper arms of the first and second arms of the third Wheatstone bridge, and two tensile sensing structures R9 and R10 of the other tensile sensing element 361 are located on the lower arms of the first and second arms of the third Wheatstone bridge. The resistance value of each tensile sensing element 361 changes corresponding to the tensile force applied to the handle 1 along the central axis A, so as to generate the corresponding third sensing signal V S3 , when the tensile force applied to the handle 1 along the central axis A is greater, the third sensing signal V S3 . The greater the absolute value of

[0118] The torque sensing unit 38 is used to sense the torque applied to the handle 1 to output the corresponding fourth sensing signal V S4 . The two strain sensing elements of the torque sensing unit 38 are two torque sensing elements 381. The two torque sensing elements 381 are symmetrically arranged around the central axis A in the annular accommodating groove 12a of the main body 10. Each torque sensing element 381 is located between each first strain sensing element 321 and each second strain sensing element 341. Each torque sensing element 381 includes a fourth flexible substrate 381a and two torque sensing structures R13 to R16 arranged on the fourth flexible substrate 381a. Each of the torque sensing structures R13 to R16 has a resistance value, so that the torque sensing unit 38 can be connected into a structure of a Wheatstone bridge as shown in Figure 16 (i.e., the fourth Wheatstone bridge). Two torque sensing structures R15 and R16 of one of the torque sensing elements 381 are located on the upper arms of the first and second arms of the fourth Wheatstone bridge, and two torque sensing structures R13 and R14 of the other torque sensing element 381 are located on the lower arms of the first and second arms of the fourth Wheatstone bridge. The resistance value of each torque sensing element 381 changes corresponding to the torque applied to the handle 1, so as to generate the corresponding fourth sensing signal V S4 , when the torque applied to the handle 1 is greater, the fourth sensing signal V S4 . The greater the absolute value of

[0119] In other embodiments, the plurality of force sensing units can be added as required to correspond to the forces applied to the handle 1 in different directions, so as to obtain the corresponding plurality of sensing signals.

[0120] Such as Figures 3 to 7As shown, the inner cylinder 40 is disposed in the hollow portion 11 of the main body 10. The inner cylinder 40 has an accommodation space 41 communicating with both ends of the inner cylinder 40 to form a third opening 41a and a fourth opening 41b. One end of the inner cylinder 40 having the third opening 41a is combined with an end cap 40a. The end cap 40a covers the third opening 41a. The end cap 40a has a third through hole 40a1 to communicate the accommodation space 41, the first opening 11a, and the first through hole 200a of the cutter head 200. The fourth opening 41b communicates with the second opening 11b and the second through hole 300a of the chuck 300. The accommodation space 41 has a first accommodation chamber 411, a second accommodation chamber 412, and a third accommodation chamber 413. The first accommodation chamber 411 and the third accommodation chamber 413 are respectively located on opposite sides of the second accommodation chamber 412 and communicate with the second accommodation chamber 412. The inner cylinder 40 has a plurality of second wire passing holes 42, at least one second coupling hole 43, and a second light transmitting hole 44. The number and positions of the plurality of second wire passing holes 42 correspond to those of the plurality of first wire passing holes 16 for the plurality of wires to pass through. The position and number of the at least one second coupling hole 43 respectively correspond to the position and number of the at least one first coupling hole 14. The second light transmitting hole 44 communicates with the accommodation space 41 and is combined with a light guide column (not shown) corresponding to the first light transmitting hole 15. In this embodiment, the number of the at least one second coupling hole 43 and the at least one first coupling hole 14 is two each. Each of the second coupling holes 43 is a blind hole. Therefore, the main body 10 and the inner cylinder 40 are combined by locking the set screws into the corresponding at least one first coupling hole 14 and at least one second coupling hole 43 in sequence. In addition, the material of the inner cylinder 40 is plastic.

[0121] As Figure 6 , Figure 7 , Figure 17 and Figure 18As shown, the circuit board assembly 50 is disposed in the second chamber 412 of the accommodation space 41. The circuit board assembly 50 includes a first circuit board 51, a second circuit board 52, a power control module 53, a light-emitting element 54, a vibration sensing module 56, a control module 57, and a wireless transmission module 55. The first circuit board 51 includes a first connector 511 for electrically connecting to the second circuit board 52. The control module 57, the wireless transmission module 55, and the vibration sensing module 56 are disposed on the first circuit board 51. The first connector 511 is electrically connected to the control module 57, the wireless transmission module 55, and the force sensing module 30. The second circuit board 52 includes a second connector 521 for connecting to the first connector 511. The power control module 53 and the light-emitting element 54 are disposed on the second circuit board 52 facing the first circuit board 51. The power control module 53 is used to connect to a battery module 60 and is electrically connected to the second connector 521 and the light-emitting element 54 to supply power to the control module 57, the wireless transmission module 55, the vibration sensing module 56, the force sensing module 30, and the light-emitting element 54. Therefore, the force sensing module 30 can receive an input voltage V i from the power control module 53, and convert the input voltage V i into the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal V S3 , and the fourth sensing signal V S4 . The battery module 60 includes two batteries 61, and the two batteries 61 are respectively disposed in the first chamber 411 and the third chamber 413. The positions of the first light-transmitting hole 15 and the second light-transmitting hole 44 correspond to the position of the light-emitting element 54. The light emitted by the light-emitting element 54 passes through the light guide column and exits from the first light-transmitting hole 15 and the second light-transmitting hole 44.

[0122] The control module 57 includes an analog / digital signal converter 571 and a controller 572. The controller 572 can be, for example, a microcontroller. The controller 572 is electrically connected to the analog / digital signal converter 571 and the vibration sensing module 56. The analog / digital signal converter 571 is electrically connected to the two first strain sensing elements 321, the two second strain sensing elements 341, the two tensile sensing elements 361, and the two torque sensing elements 381 of the force sensing module 30 through the flexible circuit board and the plurality of wires. The controller 572 obtains the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal VS3 and the fourth sensing signal V S4 , and according to the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal V S3 and the fourth sensing signal V S4 The power control module 53 controls the light-emitting element 54, so that the light-emitting element 54 can emit light to achieve the effect of warning the operator.

[0123] The wireless transmission module 55 is electrically connected to the controller 572. The force detection device 100 further includes an antenna 70. The antenna 70 is disposed in the annular accommodation groove 12a and is electrically connected to the wireless transmission module 55. The antenna 70 is printed by a flexible circuit board. Therefore, the controller 572 transmits the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal V S3 and the fourth sensing signal V S4 to an external electronic device through the wireless transmission module 55 and the antenna 70. Therefore, the operator can receive the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal V S3 and the fourth sensing signal V S4 through the external electronic device in real time to effectively monitor and analyze the working conditions of the cutting operation.

[0124] Please refer again Figure 1 and Figure 4 , the encapsulation material 80 is disposed in the annular accommodation groove 12a and the plurality of wire passing grooves 12b of the main body 10, and the encapsulation material 80 covers the force sensing module 30 and the antenna 70. The encapsulation material 80 is an epoxy resin.

[0125] Please refer again Figure 5 and Figure 7, the force detection device 100 further includes a diversion pipe 90, which extends along the central axis A and is disposed in the accommodation space 41 of the inner cylinder 40. Among them, one end of the diversion pipe 90 passes through the third through hole 40a1 and the first opening 11a to extend into the first through hole 200a of the cutter head 200, and the other end of the diversion pipe 90 passes through the fourth opening 41b to extend into the second through hole 300a of the chuck 300. The diversion pipe 90 is located between the first circuit board 51 and the second circuit board 52. Therefore, the cutting fluid can flow to the tool 2 through the first through hole 200a, the diversion pipe 90, and the second through hole 300a, so as to avoid directly contacting the first circuit board 51 and the second circuit board 52.

[0126] In summary, the force detection device 100 and the tool holder 1 of the present invention enable the real-time force change to be converted into the corresponding first sensing signal V by setting the force sensing module 30 on the main body 10. S1 , the second sensing signal V S2 , the third sensing signal V S3 and the fourth sensing signal V S4 . Then, in cooperation with the circuit board assembly 50 disposed in the inner cylinder 40, the control module 57 receives the first sensing signal V S1 , the second sensing signal V S2 , the third sensing signal V S3 and the fourth sensing signal V S4 and transmits the multiple sensing signals of the force sensing module 30 through the wireless transmission module 55, so that the operator can receive the multiple sensing signals in real time through an external electronic device, so as to achieve the purpose of effectively monitoring and analyzing the real-time working conditions of the cutting operation.

[0127] The plastic inner cylinder 40 can also provide a buffering effect to protect the circuit board assembly 50 and the battery 61, and avoid the direct contact between the circuit board assembly 50 and the battery 61 and the rigid main body 10, so as to prevent them from being easily vibrated and reducing their service life.

[0128] The above are only the preferred and feasible embodiments of the present invention. Any equivalent changes made by applying the description and claims of the present invention should be included within the scope of the patent of the present invention.

Claims

1. A force detection device, wherein a central axis is defined; characterized in that: The force detection device comprises: A main body, which is cylindrical and has a hollow portion, and an annular receiving groove is formed indented on an outer annular surface of the main body; a force sensing module, the force sensing module comprising a plurality of force sensing units, each of the force sensing units comprising two strain sensing elements, the two strain sensing elements of each of the force sensing units being symmetrically arranged in the annular receiving groove of the main body with the central axis as the center; An inner cylinder is disposed in the hollow portion of the main body, and the inner cylinder has an accommodating space; a circuit board assembly, disposed in the accommodating space, the circuit board assembly comprising a control module and a wireless transmission module, the control module being electrically connected to the force sensing module and the wireless transmission module, the control module receiving at least one sensing signal of the force sensing module and sending at least one sensing signal of the force sensing module through the wireless transmission module; A packaging material is disposed in the annular groove of the main body and covers the force sensing module.

2. The force detection device according to claim 1, characterized in that: The circuit board assembly includes a first circuit board and a second circuit board, the first circuit board is electrically connected to the second circuit board, the first circuit board is provided with the control module and the wireless transmission module, the second circuit board is provided with a power control module, and the power control module is used to connect a battery module to supply power to the control module and the wireless transmission module.

3. The force detection device according to claim 2, characterized in that: The accommodating space has a first accommodating chamber, a second accommodating chamber and a third accommodating chamber, the first accommodating chamber and the third accommodating chamber are respectively located on opposite sides of the second accommodating chamber and are connected to the second accommodating chamber, the circuit board assembly is arranged in the second accommodating chamber, and the battery module includes two batteries, and the two batteries are respectively arranged in the first accommodating chamber and the third accommodating chamber.

4. The force detection device according to claim 1, characterized in that: The main body has a first light-transmitting hole, the inner tube has a second light-transmitting hole, the circuit board assembly includes a light-emitting element, the first light-transmitting hole and the second light-transmitting hole correspond to the light-emitting element, and the light emitted by the light-emitting element is transmitted through the first light-transmitting hole and the second light-transmitting hole.

5. The force detection device according to claim 1, characterized in that: It comprises a plurality of counterweight blocks, one end of the main body is provided with a plurality of insertion holes, and each of the counterweight blocks is embedded in each of the insertion holes.

6. The force detection device according to claim 1, characterized in that: The multiple force sensing units include a first force sensing unit and a second force sensing unit, the first force sensing unit is used to sense force in a direction along a first axis, the first axis is perpendicular to the central axis, the two strain sensing elements of the first force sensing unit are two first strain sensing elements, and the two first strain sensing elements are symmetrically arranged along the first axis; the second force sensing unit is used to sense force in a direction along a second axis, the second axis is perpendicular to the central axis and the first axis, the two strain sensing elements of the second force sensing unit are two second strain sensing elements, and the two second strain sensing elements are symmetrically arranged along the second axis.

7. The force detection device according to claim 6, characterized in that: Each of the first strain sensing elements includes two first strain sensing structures, the first strain sensing structures of the two first strain sensing elements are electrically connected to form a first Wheatstone bridge, wherein the first Wheatstone bridge has a first arm and a second arm, wherein the two first strain sensing structures of one of the first strain sensing elements are respectively located at an upper arm of the first arm and a lower arm of the second arm; and the two first strain sensing structures of another of the first strain sensing elements are respectively located at a lower arm of the first arm and an upper arm of the second arm.

8. The force detection device according to claim 7, characterized in that: Each of the second strain sensing elements includes two second strain sensing structures, the second strain sensing structures of the two second strain sensing elements are electrically connected to form a second Wheatstone bridge, wherein the second Wheatstone bridge has a first arm and a second arm, wherein the two second strain sensing structures of one of the second strain sensing elements are respectively located at an upper arm of the first arm of the second Wheatstone bridge and a lower arm of the second arm of the second Wheatstone bridge; and the two second strain sensing structures of another of the second strain sensing elements are respectively located at a lower arm of the first arm of the second Wheatstone bridge and an upper arm of the second arm of the second Wheatstone bridge.

9. The force detection device according to claim 1, characterized in that: The multiple force sensing units include a tension sensing unit, the two strain sensing elements of the tension sensing unit are two tension sensing elements, and the two tension sensing elements are symmetrically arranged in the annular groove of the main body with the central axis as the center.

10. The force detection device according to claim 1, characterized in that: The multiple force sensing units include a torque sensing unit, the two strain sensing elements of the torque sensing unit are two torque sensing elements, and the two torque sensing elements are symmetrically arranged in the annular mounting groove of the main body with the central axis as the center.

11. The force detection device according to claim 1, characterized in that: It comprises an antenna, which is arranged in the annular groove, and the antenna is electrically connected to the wireless transmission module; the packaging material covers the antenna.

12. The force detection device according to claim 1, characterized in that: The main body has at least one first combining hole, the inner cylinder has at least one second combining hole, and the position of the at least one second combining hole corresponds to the position of the at least one first combining hole.

13. A tool handle for connecting a machining spindle and a tool; characterized in that: The knife handle comprises: The force detection device according to any one of claims 1 to 12; A tool handle head, used to connect the processing spindle, the tool handle head is connected to one end of the main body; A chuck is used to connect the tool, and the chuck is connected to the other end of the main body.

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