Spring collet with sensing detection structure

Abstract

The utility model relates to a spring cylinder clamp with sensing detection structure, including cylinder clamp main part, cylinder clamp main part installs on the main shaft, the middle part of cylinder clamp main part is equipped with the clamping hole for clamping tool, still include acceleration sensing device and encapsulation layer, the inside wall of cylinder clamp main part evenly is provided with a plurality of encapsulation grooves, the slot mouth of encapsulation groove faces the center of clamping hole, every encapsulation groove is encapsulated with an acceleration sensing device through encapsulation layer, and makes a plurality of acceleration sensing devices also be located same horizontal plane, the utility model discloses through the increase sensor makes the spring cylinder clamp possess the ability of acceleration detection.

Description

Technical Field

[0001] This utility model relates to the field of tool sensing and detection, and in particular to a spring collet with a sensing and detection structure. Background Technology

[0002] A spring collet is a clamping accessory mounted on a machine tool spindle to engage and lock cutting tools. Due to its various clamping advantages, spring collets are widely used in various machining clamping applications. They clamp the tool through elastic deformation, quickly and stably fixing the tool to the spindle, meeting the requirements for tool positioning and clamping force in conventional cutting processes.

[0003] However, as modern machining evolves towards higher speeds and greater precision, the monitoring of tool operating conditions becomes increasingly important. Sensors can be used to monitor tool operating conditions, such as detecting tool torque. The torque a tool experiences during machining is a key parameter reflecting its operating status. Abnormal torque fluctuations not only affect machining accuracy but can also lead to tool chipping, breakage, and even equipment malfunctions and safety accidents. Therefore, it is necessary to install sensors to monitor tool operating conditions. However, existing spring collets are limited to tool installation and fixation, lacking structural designs for tool sensing and detection. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned technical problems by adding a sensor to enable the spring collet to detect acceleration.

[0005] A spring collet with a sensing detection structure includes a collet body mounted on a spindle. The collet body has a clamping hole in the middle for clamping a tool. It also includes an acceleration sensing device and an encapsulation layer. Multiple encapsulation slots are evenly arranged on the inner sidewall of the collet body. The opening of the encapsulation slot faces the center of the clamping hole. Each encapsulation slot encapsulates an acceleration sensing device through the encapsulation layer, and the multiple acceleration sensing devices are located on the same horizontal plane.

[0006] According to the spring collet with sensing detection structure of this application, the tool is clamped and mounted on the spindle of the machine tool through the collet body of the spring collet. Multiple acceleration sensors located on the same horizontal plane are added to measure the acceleration. The tool torque is calculated based on the measured acceleration using existing calculation methods. This allows the spring collet to not only clamp the tool but also detect the tool torque. The acceleration sensors are encapsulated in the encapsulation groove by the encapsulation layer, which serves to fix and protect the acceleration sensors and prevent the acceleration sensors from shifting when the spring collet rotates at high speed, thereby avoiding errors in the torque data.

[0007] Furthermore, the bottom surface of the encapsulation groove is configured as a concave-convex surface, and the encapsulation layer aligns the concave-convex surface with the bottom surface of the accelerometer during encapsulation. The concave-convex surface enhances the encapsulation effect of the encapsulation layer, preventing the accelerometer from shifting or detaching due to impacts generated during machine tool processing.

[0008] Furthermore, the concave-convex surface is formed by multiple concentric annular wavy grooves.

[0009] Furthermore, one side of the encapsulation groove is configured as an open surface. A limiting block extending into the encapsulation groove is provided on the side of the encapsulation layer adjacent to the open surface. The accelerometer is installed from the open surface into a limiting space formed by the cooperation of the limiting block and the bottom surface of the encapsulation groove. The limiting block assists in the installation and positioning of the accelerometer, preventing displacement of the accelerometer during encapsulation.

[0010] Furthermore, the encapsulation layer is an encapsulation layer made of modified epoxy resin.

[0011] Furthermore, the acceleration sensing device includes a circuit board, a wireless communication unit, and an inertial measurement unit, with the wireless communication unit and the inertial measurement unit mounted on the circuit board. The inertial measurement unit can measure acceleration, and the wireless communication unit can transmit the data measured by the inertial measurement unit.

[0012] Furthermore, the collet body is provided with a first signal hole, which extends inward from the outer wall of the collet body and connects to the encapsulation groove. The spindle is provided with a second signal hole, which penetrates the spindle and connects to the first signal hole. Since the spindle and spring collet are generally made of metal, the first and second signal holes facilitate the wireless communication unit to transmit wireless signals to the outside.

[0013] Furthermore, it also includes an electric slip ring used to power the acceleration sensing device. The electric slip ring includes a rotating part, which is fixed on the main shaft and rotates with the main shaft. An electrical connection wire is led out from the rotating part, extends through the first signal hole and the second signal hole, and is electrically connected to the acceleration sensing device. Powering the acceleration sensing device through the electric slip ring enables the acceleration sensing device to operate normally.

[0014] Furthermore, the wireless communication unit is an NFC communication unit.

[0015] Furthermore, the encapsulation slots are provided in three parts, and the acceleration sensing device is configured in accordance with the number of encapsulation slots. Attached Figure Description

[0016] Figure 1This is an exploded view of the spring collet with a sensing detection structure of this utility model.

[0017] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0018] Figure 3 This is a cross-sectional view of the spring collet with a sensing detection structure according to the present invention.

[0019] Figure 4 This is a perspective view of the main shaft of this utility model.

[0020] Figure 5 This is a cross-sectional view of the main shaft of this utility model. Detailed Implementation

[0021] The present invention relates to a spring collet with a sensing detection structure, as illustrated in the accompanying drawings.

[0022] like Figures 1 to 5 The spring collet with a sensing detection structure shown includes a collet body 1, which is mounted on a spindle 5. The collet body 1 has a clamping hole 11 in the middle for clamping a tool 4. In the prior art, a locking cap threaded to the spindle 5 is generally used to drive the collet body 1 to elastically deform towards the clamping hole 11, thereby clamping the tool 4. It also includes an acceleration sensor 3 and an encapsulation layer. Multiple encapsulation slots 2 are evenly arranged on the inner wall of the collet body 1, with the opening of each slot facing the center of the clamping hole 11. Each encapsulation slot 2 encapsulates an acceleration sensor 3 through the encapsulation layer, and the multiple acceleration sensors 3 are located on the same horizontal plane. In the embodiment shown in the accompanying drawings, there are three encapsulation slots 2, and the acceleration sensors 3 are arranged to match the number of encapsulation slots 2. In the prior art, the acceleration α in the x, y, and z directions is first measured by the three acceleration sensors 3 respectively. x ,a y ,a z Composite acceleration amplitude A total The calculation formula is: A total =√(a x 2 +a y 2 +a z 2 The relationship between torque T and the magnitude of the resultant acceleration is: T = CA total The torque T is calculated using existing calculation methods, where C is the calibration coefficient. The torque of the tool 4 can be obtained by calculation using existing technology. This allows the spring collet to not only clamp the tool 4, but also detect the acceleration of the tool 4, thus facilitating the subsequent calculation of the torque on the tool 4.

[0023] The accelerometer 3 is encapsulated within the encapsulation groove 2 by the encapsulation layer, which serves to fix and protect the accelerometer 3. It also prevents the accelerometer 3 from shifting during high-speed rotation of the spring collet, thus avoiding torque data errors. The encapsulation layer is made of modified epoxy resin. In a preferred embodiment, the encapsulation layer is made of 3M-DP420 modified epoxy resin. This type of encapsulation layer features temperature resistance, high bonding strength, low curing shrinkage, and a certain degree of elasticity. It can withstand temperatures up to 150°C, making the encapsulation layer suitable for machine applications. During processing, localized high temperatures are generated, which maintains the encapsulation performance while preventing the accelerometer 3 from falling out of the encapsulation tank 2; the bonding strength of the encapsulation layer of this model is >20MPa, which allows the accelerometer 3, as an electronic component, to be firmly bonded to the metal product's collet body 1; the curing shrinkage rate is <1%, which is easy for batch installation and will not cause a small gap between the accelerometer 3 and the bottom surface of the encapsulation tank 2 due to expansion after glue injection; in addition, this adhesive model contains flexible chain segments, which have a certain degree of elasticity, can buffer vibration and impact, and can withstand the large impact force generated when the high-speed rotating cutter head stops and hits the blade.

[0024] Preferably, the outer surface of the encapsulation layer after encapsulation matches the arc surface of the inner sidewall of the collet body 1 to form a complete arc surface, thereby facilitating the clamping of the tool 4.

[0025] The bottom surface of the encapsulation groove 2 is configured with a concave-convex surface 22, which is aligned with the bottom surface of the accelerometer sensor 3 during encapsulation. The concave-convex surface 22 enhances the encapsulation effect. During encapsulation, after the adhesive enters the encapsulation groove 2, the concave-convex surface 22 allows it to travel between the accelerometer sensor 3 and the bottom surface of the groove. After curing, the adhesive forms an encapsulation layer, thus increasing the bonding and encapsulation effect and preventing the accelerometer sensor 3 from shifting or detaching due to impacts generated during machine tool processing.

[0026] like Figure 1 and Figure 2 As shown in the accompanying drawings, in the embodiment shown in this application, the uneven surface 22 is formed by multiple concentric annular wave-shaped grooves. The wave-shaped damping principle is used to buffer the impact generated during machine tool processing. The specific principle is as follows:

[0027] According to nonlinear mechanics, the mitigation of finite amplitude waves (impact force - sharp wave crest) can be achieved by extending the impact time through wave surface deformation. According to the impulse theorem (I = F * δt, where I is the impulse, F is the impact force, and t is the time of impact), during the mitigation process, energy is dissipated through the viscosity of the binder (internal friction of organic matter), converting the impact kinetic energy into heat energy. Furthermore, the direction of the impact force transmission forms a relative velocity with the direction of motion through the acceleration sensing device 3, thereby reducing the instantaneous impact intensity.

[0028] like Figures 1 to 3 As shown, one side of the encapsulation groove 2 is set as an open surface, which is located on the end face of a section of the collet body 1. A limiting block 21 extending into the encapsulation groove 2 is provided on the side of the encapsulation layer adjacent to the open surface. The acceleration sensing device 3 is installed from the open surface into the limiting space formed by the cooperation of the limiting block 21 and the bottom surface of the encapsulation groove 2. The limiting block 21 can assist in the installation and positioning of the acceleration sensing device 3 and prevent the acceleration sensing device 3 from shifting during encapsulation.

[0029] like Figure 1 As shown, the acceleration sensing device 3 includes a circuit board 31, a wireless communication unit 33, and an inertial measurement unit 32, with the wireless communication unit 33 and the inertial measurement unit 32 mounted on the circuit board 31.

[0030] like Figures 1 to 5 As shown, the collet body 1 is provided with a first signal hole 12, which extends inward from the outer side wall of the collet body 1 and connects to the encapsulation groove 2. The main shaft 5 is provided with a second signal hole 51, which passes through the main shaft 5 and connects to the first signal hole 12. Since the main shaft 5 and the spring collet are generally made of metal, the wireless communication unit 33 can easily transmit wireless signals to the outside by opening the first signal hole 12 and the second signal hole 51.

[0031] like Figure 4 and Figure 5As shown, it also includes an electric slip ring 6, which is used to power the acceleration sensing device 3. The electric slip ring 6 is a common electrical component that connects rotating bodies and transmits energy and signals. The electric slip ring 6 includes a stationary part 62 and a rotating part 61. The rotating part 61 is fixed on the main shaft 5 and rotates with the main shaft 5. The stationary part 62 is stationary relative to the rotating part 61 and the main shaft 5, which facilitates its connection to an external power source. The stationary part 62 and the rotating part 61 are rotatably connected, so that the power source connected to the stationary part 62 can be transmitted to the rotating part 61. Then, an electrical connection wire is led out from the rotating part 61, extends into the first signal hole 12 and the second signal hole 51, and is electrically connected to the acceleration sensing device 3, so that the acceleration sensing device 3 can work normally. The electric slip ring 6 also has the function of signal transmission. Similarly, the signal of the acceleration sensing device 3 can also be transmitted by the electric slip ring 6. Preferably, the size of the first signal hole 12 and the second signal hole 51 is larger than the size of the electrical connection wire to avoid the electrical connection wire blocking the signal hole and affecting the communication of the wireless communication unit 33.

[0032] Preferably, the length of the encapsulation slot 2 is 6mm and the width is 4mm. The length and width of the circuit board 31 match the length and width of the encapsulation slot 2, so that the circuit board 31 is installed in the encapsulation slot 2 with a clearance fit. The wireless communication unit 33 and the inertial measurement unit 32 are commercially available models. For example, the inertial measurement unit 32 is model LSM6DSV32X, which uses an LGA-14L package (size 2.5×3.0×0.83mm) and can be installed on the circuit board 31 of this size, adapting to the narrow space of the encapsulation slot 2. The wireless communication unit 33 is model ST25TV02K NFC communication unit, which can also be installed on the circuit board 31 of this size. The NFC communication unit is a near-field communication unit. Placing the NFC communication unit close to the inertial measurement unit 32 increases the signal strength of NFC communication.

[0033] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A spring collet with a sensing detection structure, comprising a collet body mounted on a spindle, wherein the collet body has a clamping hole in the middle for clamping a cutting tool, characterized in that, It also includes an acceleration sensing device and an encapsulation layer. Multiple encapsulation slots are evenly arranged on the inner sidewall of the collet body. The opening of the encapsulation slot faces the center of the clamping hole. An acceleration sensing device is encapsulated in each encapsulation slot through the encapsulation layer, and the multiple acceleration sensing devices are also located on the same horizontal plane.

2. The spring collet with a sensing detection structure according to claim 1, characterized in that, The bottom surface of the encapsulation groove is configured as a concave-convex surface, and the encapsulation layer is configured such that the concave-convex surface is opposite to the bottom surface of the acceleration sensing device during encapsulation.

3. The spring collet with a sensing detection structure according to claim 2, characterized in that, The concave-convex surface is formed by multiple concentric annular wavy grooves.

4. The spring collet with a sensing detection structure according to claim 1, characterized in that, One side of the encapsulation groove is set as an open surface. A limiting block extending into the encapsulation groove is provided on the side of the encapsulation layer adjacent to the open surface. The acceleration sensing device is installed from the open surface into the limiting space formed by the cooperation of the limiting block and the bottom surface of the encapsulation groove.

5. The spring collet with a sensing detection structure according to any one of claims 1 to 4, characterized in that, The encapsulation layer is made of modified epoxy resin.

6. The spring collet with a sensing detection structure according to claim 1, characterized in that, The acceleration sensing device includes a circuit board, a wireless communication unit, and an inertial measurement unit, which are mounted on the circuit board.

7. The spring collet with a sensing detection structure according to claim 6, characterized in that, The collet body is provided with a first signal hole, which extends inward from the outer side wall of the collet body and connects to the encapsulation groove. The main shaft is provided with a second signal hole, which passes through the main shaft and connects to the first signal hole.

8. The spring collet with a sensing detection structure according to claim 7, characterized in that, It also includes an electric slip ring, which is used to power the acceleration sensing device. The electric slip ring includes a rotating part, which is fixed on the main shaft and rotates with the main shaft. An electrical connection wire is led out from the rotating part, extends into the first signal hole and the second signal hole, and is electrically connected to the acceleration sensing device.

9. The spring collet with a sensing detection structure according to claim 6, characterized in that, The wireless communication unit is an NFC communication unit.

10. The spring collet with a sensing detection structure according to claim 1, characterized in that, The encapsulation slots are provided in three locations, and the acceleration sensing device is configured to correspond to the number of encapsulation slots.

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