A tool holder structure

Abstract

The utility model relates to a tool holder vibration measurement technical field especially a tool holder structure, including the tool holder body that has the water passage of opening along the axial direction, the first mounting hole that is also opened with water passage intercommunication is established on the tool holder body, and the acceleration sensor module is installed in the first mounting hole, and the flow channel gap is arranged between the outside of acceleration sensor module and the inner wall of water passage to keep the center water function of tool holder body, wherein at least one measurement direction of acceleration sensor module is parallel to the rotation plane of tool holder body, and the shortest straight line distance between the measurement reference point of acceleration sensor module and tool holder body axis is limited in the predetermined range value, guarantees acceleration sensor module to be able to normal measurement acceleration of tool holder body to the measurement range of acceleration sensor module simultaneously with lower requirement.

Description

Technical Field

[0001] This utility model relates to the field of vibration measurement technology for tool holders, and in particular to a tool holder structure. Background Technology

[0002] In the field of machining, tool holder vibration monitoring is crucial for improving machining accuracy and tool life. Current technologies typically rely on piezoelectric or piezoresistive accelerometers for tool holder vibration detection. While these sensors offer high measurement accuracy, their high manufacturing cost severely restricts the widespread application of related monitoring technologies.

[0003] In contrast, capacitive MEMS accelerometers offer significant cost advantages, yet they struggle to find effective applications in real-world machining environments. This is because when the sensor rotates at high speed with the tool holder, it generates substantial centrifugal acceleration within a specific rotation radius. However, the actual vibration signals during machining are often extremely weak, requiring the sensor to possess both extremely large range and extremely high accuracy and resolution. Nevertheless, the range, accuracy, and resolution of capacitive accelerometers are typically positively correlated. Large-range sensors struggle to meet the accuracy requirements of weak vibration signals, while small-range sensors are prone to range overflow due to centrifugal acceleration, rendering them inoperable.

[0004] In addition, some existing wireless vibration signal acquisition tool holders, after integrating sensors, often lose their original center water outlet function due to structural design problems, which affects the normal delivery of cutting fluid and further limits their application scenarios.

[0005] Therefore, how to achieve low-cost, high-precision vibration monitoring while retaining the water outlet function at the center of the tool holder has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability of small-range sensors to function properly due to centrifugal acceleration causing range overflow. This invention proposes a tool holder structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: Design a knife handle structure, including: The handle body has a water passage along its axial direction; The handle body is also provided with a first mounting hole that communicates with the water passage. An acceleration sensor module is installed in the first mounting hole. A flow channel gap is provided between the outer side of the acceleration sensor module and the inner wall of the water passage. Wherein, at least one measurement direction of the acceleration sensor module is parallel to the rotation plane of the tool holder body, and the shortest straight-line distance between the measurement reference point of the acceleration sensor module and the axis of the tool holder body is limited to a predetermined range value.

[0008] Furthermore, the predetermined range value is 0-3mm; And / or, the measurement reference point coincides with the axis of the tool holder body.

[0009] Furthermore, the accelerometer module is waterproof and installed inside the water passage.

[0010] Furthermore, the acceleration sensor module includes a waterproof housing connected to the first mounting hole, and an acceleration sensor is installed inside the waterproof housing, the acceleration sensor having the measurement reference point.

[0011] Furthermore, a second mounting hole is provided on the waterproof housing, and a positioning component is placed inside the second mounting hole. The positioning component has a mounting clamp, and the acceleration sensor is placed in the mounting clamp. And / or, the second mounting hole has at least one open end and an end cap is provided inside the open end; And / or, the shortest straight-line distance between the measurement reference point of the acceleration sensor and the axis of the tool holder body is adjustable; And / or, the first mounting hole is a threaded hole, and the outer side of the waterproof housing has a threaded section that can be threadedly connected to the threaded hole.

[0012] Furthermore, the acceleration sensor module also includes a circuit board, the acceleration sensor is connected to the circuit board, and the circuit board is clamped in the mounting clip.

[0013] Furthermore, the circuit board is connected to an antenna, a processing module, a transmitting module, and a power supply module. The processing module is electrically connected to the accelerometer, and the processing module is wirelessly connected to an external terminal through the transmitting module and the antenna.

[0014] Furthermore, a cover is fixedly installed below the handle body; a cover is provided on the outside of the handle body and a power supply is installed between the two; an inlet port located outside the water passage is opened on the waterproof housing; a wiring hole is provided on the top of the handle body; the power supply wire passes through the wiring hole and the inlet port and is electrically connected to the acceleration sensor module.

[0015] Furthermore, the axis of the first mounting hole is offset from the axis of the tool holder body; And / or, the axis of the first mounting hole is perpendicular to the axis of the tool holder body.

[0016] Furthermore, a side hole is provided on the outer side of the handle body to connect with and communicate with the flow channel gap, and a water-stop bolt is threaded inside the side hole.

[0017] The tool holder structure proposed in this utility model has the following advantages: First, by making at least one measurement direction of the accelerometer module parallel to the rotation plane of the tool holder body, and limiting the shortest straight-line distance between the measurement reference point of the accelerometer module and the axis of the tool holder body to a predetermined range, it can ensure that the accelerometer module can normally measure the acceleration of the tool holder body while having lower requirements on the measurement range of the accelerometer module; Second, by configuring a flow channel gap between the outer side of the accelerometer module and the inner wall of the water passage, the shortest straight-line distance between the measurement reference point of the accelerometer module and the axis of the tool holder body is kept small while retaining the center water outlet function of the tool holder body. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at BB; Figure 5 This is a schematic diagram of the structure of the blade body of this utility model when removing the cover; Figure 6 This is a schematic diagram of the acceleration sensor module structure of this utility model; Figure 7 This is an exploded view of the acceleration sensor module of this utility model; Figure 8 This is a schematic diagram of the positioning component structure of this utility model.

[0019] In the diagram: 1. Tool holder body; 10. Water passage; 11. First mounting hole; 12. Flow channel gap; 13. Cover; 14. Switch; 15. Power supply; 16. Wiring hole; 17. End cap; 18. Plug; 19. Side hole; 110. Water-stop bolt; 2. Accelerometer sensor module; 21. Waterproof housing; 22. Second mounting hole; 23. Accelerometer sensor; 24. Circuit board; 25. Positioning component; 251. Mounting clamp; 26. Antenna; 27. Processing module; 28. Transmitting module; 29. ​​Power supply module; 210. Cable inlet. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1-8 As an embodiment of the utility model, a tool holder structure is disclosed. Specifically, the tool holder structure includes a tool holder body 1 with a water passage 10 formed along the axial direction. The water passage 10 passes through both ends of the tool holder body 1. The tool holder body 1 also has a first mounting hole 11 communicating with the water passage 10. An acceleration sensor module 2 is installed in the first mounting hole 11. A flow channel gap 12 is disposed between the outer side of the acceleration sensor module 2 and the inner wall of the water passage 10. At least one measurement direction of the acceleration sensor module 2 is parallel to the rotation plane of the tool holder body 1, and the shortest straight-line distance between the measurement reference point of the acceleration sensor module 2 and the axis of the tool holder body 1 is limited to a predetermined range.

[0022] In this embodiment, by making at least one measurement direction of the accelerometer module 2 parallel to the rotation plane of the tool holder body 1, and limiting the shortest straight-line distance between the measurement reference point of the accelerometer module 2 and the axis of the tool holder body 1 to a predetermined range, firstly, it can ensure that the accelerometer module 2 can normally measure the acceleration of the tool holder body 1 while having a lower requirement for the measurement range of the accelerometer module 2; secondly, by configuring a flow channel gap 12 between the outer side of the accelerometer module 2 and the inner wall of the water passage 10, it ensures that the shortest straight-line distance between the measurement reference point of the accelerometer module 2 and the axis of the tool holder body 1 is small while retaining the center water outlet function of the tool holder body 1.

[0023] In one optional embodiment, the predetermined range is 0-3mm. Within this range, the accelerometer module 2 itself will only generate a small centrifugal acceleration when rotating, so that the accelerometer module 2 has a low measurement range requirement when measuring the acceleration of the tool holder body 1.

[0024] In one alternative implementation, the measurement reference point coincides with the axis of the tool holder body 1, thereby further reducing the measurement range requirement of the acceleration sensor module 2. A lower range means lower cost. The acceleration sensor 23 is, for example, a piezoelectric, pressure-type, or capacitive type. It is worth mentioning that this design allows capacitive acceleration sensors with a lower range to also be used on the tool holder body 1 for acceleration measurement.

[0025] In some embodiments, the acceleration sensor module 2 of the present invention includes: a waterproof housing 21 installed in the first mounting hole 11, the interior of the waterproof housing 21 having a second mounting hole 22, an acceleration sensor 23 disposed in the second mounting hole 22, the acceleration sensor 23 having the aforementioned measurement reference point; the connection between the waterproof housing 32 and the first mounting hole 11 can be a detachable connection or a fixed connection.

[0026] In an optional embodiment, the waterproof housing 21 and the first mounting hole 11 are threaded together, that is, the first mounting hole 11 has an internal thread and the waterproof housing 21 has a threaded section, so as to achieve convenient installation of both; at the same time, the depth of the waterproof housing 21 screwed into the first mounting hole 11 can be controlled by the threaded connection, thereby adjusting the distance between the measurement reference point of the acceleration sensor 23 and the axis of the tool holder body 1, so as to be suitable for more usage scenarios.

[0027] Of course, in another embodiment, the accelerometer 23 can also be directly placed into the second mounting hole 22. The part of the accelerometer 23 located in the water passage 10 is designed to be waterproof. Meanwhile, the second mounting hole 22 can be a through hole or a blind hole structure. The accelerometer 23 can be positioned and installed by means of adhesive or welding. In addition, in this embodiment, the waterproof housing 21 can also be fixed in the first mounting hole 11 by adhesive. In this embodiment, the shape of the first mounting hole 11 is not limited. It can be circular or square. The shape of the waterproof housing 21 can be adapted to the shape of the first mounting hole 11.

[0028] Furthermore, the accelerometer 23 described in this embodiment can be a triaxial accelerometer.

[0029] Taking the accelerometer 23 of this invention as a triaxial accelerometer, it measures acceleration in the x, y, and z directions. Generally, one axis is parallel to the rotation axis to measure axial vibration during machining. Machining-induced vibration is typically small, usually within the range of 0-8g. However, if the radius of the rotation plane is too large, a large centrifugal acceleration (a=ω²*r) will be generated during rotation. For example, if the radius of the accelerometer is 10mm, a centrifugal acceleration of 716g will be generated at 8000rpm, requiring the accelerometer to have a large range. However, when the accelerometer has a large range, its resolution will decrease, making it impossible to achieve precise measurement of machining vibration. In this invention, by placing the accelerometer 23 very close to the tool holder's rotation axis, the centrifugal acceleration experienced by the accelerometer 23 can be controlled to be very small, thus reducing the range requirement of the accelerometer 23. Of course, those skilled in the art can also adjust the radius of the accelerometer to achieve corresponding designs for tool holders in different application scenarios, such as high or low speeds.

[0030] Based on the above embodiments, the acceleration sensor module 2 in this embodiment further includes a circuit board 24; the acceleration sensor 23 is connected to the circuit board 24, a positioning member 25 is placed inside the second mounting hole 22, and a mounting clamp 251 is provided axially in the middle of the positioning member 25. The circuit board 24 is placed in the mounting clamp 251, and the acceleration sensor 23 is connected to the mounting clamp 251 through the circuit board 24, thereby making its installation simpler and more stable.

[0031] In addition, the circuit board 24 is also equipped with an antenna 26, a processing module 27, a transmitting module 28 and a power module 29. The processing module 27 is electrically connected to the accelerometer 23, and the processing module 27 is wirelessly connected to an external terminal through the transmitting module 28 and the antenna 26.

[0032] It should be noted that the mounting clip 251 described in this embodiment also has a clearance opening, which is used to avoid the antenna 26, processing module 27, transmitting module 28 and power module 29. Since all of the above modules protrude from the circuit board 24, the design of the clearance opening can effectively avoid and accommodate each module.

[0033] Based on the above embodiments, a cover 13 is also fixedly installed below the knife handle body 1 in this utility model. Preferably, the cover 13 in this embodiment can be connected to the knife handle body 1 by a snap-fit ​​structure or by adhesive bonding. A switch 14 and a power supply 15 are fixedly installed between the cover 13 and the handle body 1. In this embodiment, the power supply 15 is a storage battery. The power supply 15 is electrically connected to the power module 29 of the circuit board 24 through the switch 14. The switch 14 has an operating part that is at least partially exposed outside the cover 13. Thus, the user can control the on / off supply of power from the power supply 15 to the power module 29 by operating the switch 14. In order to facilitate user operation, since at least a part of the operating part 14 is exposed outside the cover 13, the user can directly access and operate the switch 14 without opening the cover 13.

[0034] Specifically, this embodiment only improves the position of the accelerometer 23, without improving its circuit structure. Such structures and principles are conventional methods for those skilled in the art, so the structure and principle of this part will not be explained further.

[0035] Of course, in the above embodiments, the antenna 26, processing module 27, transmitting module 28 and power supply module 29 are integrated with the acceleration sensor 23. In other embodiments, the acceleration sensor 23 can be installed separately, and the integrated circuit boards of each module can be installed in the above-mentioned cover 13. The specific installation method can be selected by those skilled in the art, and will not be elaborated here.

[0036] In some embodiments, in order to facilitate convenient electrical connection between the power supply 15 and the circuit board 24, the waterproof housing 21 in this embodiment has a cable inlet 210 at the opening end of the second mounting hole 22, and a cable routing hole 16 is provided above the handle body 1, which faces the cable inlet 210. The wires of the power supply 15 pass through the cable routing hole 16 and the cable inlet 210 in sequence and are electrically connected to the power module 29. This also prevents the wiring from affecting the waterproof performance of the waterproof housing 21.

[0037] It should be noted that in this embodiment, the first mounting hole 11 can be a hole with two openings, and the two openings are respectively connected to the end cap 17 and the plug 18; the end cap 17 and the plug 18 respectively stop and abut against the two ends of the acceleration sensor module 2.

[0038] In this embodiment, the end cap 17 and the plug 18 can be installed inside the first mounting hole 11 by means of threaded connection. The purpose of this design is to achieve waterproofing and to position the internal waterproof shell 21. Of course, in other embodiments, the end cap 17 and the plug 18 can also be fixed inside the first mounting hole 11 by means of adhesive or bonding, which can also achieve the same technical effect.

[0039] It should be noted that, in this embodiment, the outer side of the handle body 1 is also provided with a side hole 19 that communicates with the flow channel gap 12. The side hole 19 is connected to the side near the flow channel gap 12, and a water-stop bolt 110 is threadedly connected inside the side hole 19.

[0040] The side hole 19 described in this embodiment is used to stabilize water pressure and flow rate. Its diameter is not limited. A water-stop bolt 110 can be used to seal the side hole 19 to avoid water leakage. Of course, a sealing ring can also be set on the outside of the water-stop bolt 110 to improve waterproofing. This method is a conventional method for those skilled in the art and will not be elaborated here.

[0041] In summary, this invention, by setting a flow channel gap 12 between the outer side of the accelerometer module 2 and the water channel 10, ensures that the water channel 10 of the tool holder body 1 is not completely blocked when the accelerometer module 2 is installed, thereby effectively preserving the water outlet function at the center of the tool holder and achieving structural compatibility between cutting fluid flow and sensor detection. At the same time, by controlling the radial distance between the measurement reference point of the accelerometer 23 and the axis of the water channel 10 within a small preset range, the amplitude of centrifugal acceleration under rotation is significantly reduced. This design not only reduces the mechanical stress borne by the sensor, but also allows a capacitive accelerometer with a smaller range to meet the requirements of high-precision vibration detection, taking into account both measurement sensitivity and low cost requirements.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A knife handle structure, characterized in that, include: The handle body (1) has a water passage (10) along its axial direction; The handle body (1) is also provided with a first mounting hole (11) that communicates with the water passage (10). An acceleration sensor module (2) is installed in the first mounting hole (11). A flow channel gap (12) is provided between the outer side of the acceleration sensor module (2) and the inner wall of the water passage (10). In this embodiment, at least one measurement direction of the acceleration sensor module (2) is parallel to the rotation plane of the tool holder body (1), and the shortest straight-line distance between the measurement reference point of the acceleration sensor module (2) and the axis of the tool holder body (1) is limited to a predetermined range.

2. The knife handle structure according to claim 1, characterized in that: The predetermined range value is 0-3mm; And / or, the measurement reference point coincides with the axis of the tool holder body (1).

3. The knife handle structure according to claim 1, characterized in that: The acceleration sensor module (2) is waterproof and is installed in the water passage (10).

4. The knife handle structure according to claim 1, characterized in that: Said plus The speed sensor module (2) includes a waterproof housing (21) connected to the first mounting hole (11), and an acceleration sensor (23) is installed inside the waterproof housing (21), the acceleration sensor (23) having the measurement reference point.

5. The knife handle structure according to claim 4, characterized in that: The waterproof housing (21) has a second mounting hole (22), and a positioning element (25) is placed inside the second mounting hole (22). The positioning element (25) has a mounting clamp (251), and the acceleration sensor (23) is placed in the mounting clamp (251).

6. The tool holder structure according to claim 5, characterized in that: The acceleration sensor module (2) also includes a circuit board (24), the acceleration sensor (23) is connected to the circuit board (24), and the circuit board (24) is clamped in the mounting clip (251).

7. A knife handle structure according to claim 6, characterized in that: The circuit board (24) is connected to an antenna (26), a processing module (27), a transmitting module (28), and a power module (29). The processing module (27) is electrically connected to the accelerometer (23), and the processing module (27) is wirelessly connected to an external terminal through the transmitting module (28) and the antenna (26).

8. The knife handle structure according to claim 5, characterized in that: The second mounting hole (22) has at least one open end and an end cap (17) is provided inside the open end; And / or, the shortest straight distance between the measurement reference point of the acceleration sensor (23) and the axis of the tool holder body (1) is adjustable; And / or, the first mounting hole (11) is a threaded hole, and the outer side of the waterproof housing (21) has a threaded section that can be threadedly connected to the threaded hole.

9. A tool holder structure according to any one of claims 4-8, characterized in that: A cover (13) is fixedly installed below the handle body (1); a cover (13) is provided on the outside of the handle body (1) and a power supply (15) is installed between the two; an inlet (210) located outside the water passage (10) is provided on the waterproof housing (21); a wiring hole (16) is provided on the top of the handle body (1); the wire of the power supply (15) passes through the wiring hole (16) and the inlet (210) and is electrically connected to the acceleration sensor module (2).

10. A tool holder structure according to any one of claims 1-8, characterized in that: The axis of the first mounting hole (11) is offset from the axis of the tool holder body (1); And / or, the axis of the first mounting hole (11) is perpendicular to the axis of the tool holder body (1); And / or, the outer side of the handle body (1) is provided with a side hole (19) that connects to and communicates with the flow channel gap (12), and the inside of the side hole (19) is threaded with a water-stop bolt (110).

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