Anti-overload tool holder device

Abstract

The application discloses an overload-preventing tool holder device, which comprises a first tool holder and a second tool holder, the first tool holder is used for connecting a machine tool spindle, the second tool holder is used for connecting a tool, a coupling torque converter is arranged between the first tool holder and the second tool holder, the coupling torque converter is used for transmitting torque between the first tool holder and the second tool holder, at least two arc-shaped sliding grooves are formed on the first tool holder and the second tool holder and located on the outside of the coupling torque converter, the center of the arc-shaped sliding grooves is coincident with the axis of the first tool holder, and a slidable guide sliding pin is arranged between adjacent arc-shaped sliding grooves between the first tool holder and the second tool holder. The application has the advantages of overload-preventing capability and reduced tool holder fracture risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining, in particular to a kind of anti-overload tool holder device. BACKGROUND

[0002] In recent years, with the continuous development and improvement of aviation, aerospace technology, new generation aircraft structure is more complex, manufacturing cycle requires shorter, higher requirements for part processing, material strength and rigidity, and most of the aircraft structure is currently milled by milling method.Processing. Some new difficult-to-machine materials have characteristics such as high strength and high hardness, which can be widely used in aircraft part structures, but in the processing process, problems such as tool holder fracture and tool collapse often occur due to unreasonable processing parameters, which leads to the decline of spindle, slide rail and other precision of machine tool due to excessive load, and even causes the spindle of machine tool to be scrapped.

[0003] The tool holder used in the existing processing field lacks overload control capability when the torque is too large, which ultimately leads to mismatching of processing parameters, not only delays the production rhythm, but also causes serious economic losses. SUMMARY

[0004] The main purpose of the present application is to provide an anti-overload tool holder device, which aims to solve the technical problem that the existing tool holder lacks anti-overload capability when the torque is too large.

[0005] To achieve the above-mentioned purpose, the present application provides an anti-overload tool holder device, which comprises a first tool holder and a second tool holder, the first tool holder is used to connect the spindle of machine tool, the second tool holder is used to connect the tool, a coupling torque converter is arranged between the first tool holder and the second tool holder, the coupling torque converter is used to transmit the torque between the first tool holder and the second tool holder, at least two arc-shaped sliding grooves are formed on the first tool holder and the second tool holder, the center of the arc-shaped sliding groove corresponds to the axis of the first tool holder, and a slideable guide pin is arranged between the adjacent arc-shaped sliding grooves of the first tool holder and the second tool holder.

[0006] Optionally, the coupling torque converter comprises a first track disc and a second track disc embedded between the first tool holder and the second tool holder, a plurality of groups of rolling bodies are arranged in annular array between the first track disc and the second track disc, so that the first track disc and the second track disc rotate relative to each other when the overload condition is reached; wherein the overload condition is that the torque between the first tool holder and the second tool holder exceeds the rated torque.

[0007] Optionally, each rolling body comprises two mutually contacting balls, a conical surface and a spherical surface are respectively arranged on the balls, the adjacent two balls contact each other through the conical surface, and a spherical groove in contact with the corresponding spherical surface is formed on one side of the first track disc and the second track disc.

[0008] Optionally, a torque adjusting mechanism is arranged between the coupling variator and the second tool holder, and the torque adjusting mechanism is used to adjust the distance between the coupling variator and the second tool holder, so as to adjust the rated torque between the first tool holder and the second tool holder.

[0009] Optionally, the torque adjusting mechanism comprises a first wedge and a second wedge which are in contact with each other, and the opposite sides of the first wedge and the second wedge are inclined surfaces which are in contact with each other, the other side of the first wedge is a flat surface which is in contact with the coupling variator, and the other side of the second wedge is a flat surface which is in contact with the second tool holder.

[0010] Optionally, a cross roller bearing is arranged between the first tool holder and the second tool holder, and the cross roller bearing is sleeved outside the coupling variator.

[0011] Optionally, the guide sliding pin comprises a first sliding pin and a second sliding pin, the first sliding pin is slidingly arranged in the arc-shaped sliding groove of the first tool holder, the second sliding pin is slidingly arranged in the arc-shaped sliding groove of the second tool holder, and the first sliding pin and the second sliding pin are connected through threads.

[0012] Optionally, a compression spring is sleeved outside the guide sliding pin, and the compression spring abuts against the first tool holder and the second tool holder.

[0013] Optionally, the coupling variator is connected with a three-way force sensor, the three-way force sensor is embedded in the first tool holder, and the three-way force sensor is located at the axial center line position of the first tool holder.

[0014] Optionally, the second tool holder is connected with a clamping mechanism at the end away from the first tool holder, and the second tool holder is connected with a tool through the clamping mechanism.

[0015] Optionally, the clamping mechanism comprises a spring barrel clamp used for clamping the tool, the end of the second tool holder is provided with a mounting groove matched with the spring barrel clamp, the spring barrel clamp extends out of the mounting groove and is sleeved with a locking nut, and the locking nut is threadedly sleeved on the outer wall of the second tool holder.

[0016] Optionally, the outer walls of the first tool holder and the second tool holder are both provided with clamping grooves.

[0017] Optionally, the first tool holder is connected with a tool holder pull pin at the end away from the second tool holder, and the first tool holder is clamped on a main shaft of a machine tool through the tool holder pull pin.

[0018] The application can achieve the following beneficial effects:

[0019] The application comprises a first tool holder and a second tool holder, the first tool holder is used for connecting a machine tool spindle, the second tool holder is used for connecting a tool, a coupling torque converter is arranged between the first tool holder and the second tool holder, the coupling torque converter is used for transmitting torque between the first tool holder and the second tool holder, at least two arc-shaped sliding grooves are arranged on the first tool holder and the second tool holder and located outside the coupling torque converter, the center of the arc-shaped sliding grooves corresponds to the axis of the first tool holder, and a slide guide pin is arranged between adjacent arc-shaped sliding grooves between the first tool holder and the second tool holder. The tool holder is divided into the first tool holder and the second tool holder, the first tool holder and the second tool holder are fastened by the slide guide pin, so that the coupling torque converter is clamped between the first tool holder and the second tool holder, when the first tool holder is connected to the machine tool spindle, the machine tool spindle drives the first tool holder to rotate, the coupling torque converter transmits torque between the first tool holder and the second tool holder, so as to drive the second tool holder and the tool at the end of the second tool holder to rotate synchronously, so as to process the machining material by the tool, when the rotating speed exceeds the rated torque, the second tool holder and the coupling torque converter will rotate relatively, that is, the second tool holder and the first tool holder rotate relatively, and the slide guide pin also slides along the arc-shaped sliding groove to the corresponding position, so that when the machining of difficult-to-machine materials exceeds the spindle load, the first tool holder and the second tool holder can rotate relatively, so as to realize the spindle torque overload protection, reduce the risk of tool holder fracture, and improve the service life. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 FIG. 1 is a structural schematic view of an anti-overload tool holder device in an embodiment of the present application;

[0022] Figure 2 FIG. 2 is a structural schematic view of a top view of the anti-overload tool holder device of FIG. 1. Figure 1

[0023] Reference signs:

[0024] ​110 - first tool holder, 120 - second tool holder, 130 - tool, 140 - coupling variator, 141 - first track disc, 142 - second track disc, 143 - ball, 1431 - conical surface, 1432 - spherical surface, 150 - arc-shaped sliding groove, 160 - guide sliding pin, 170 - torque adjusting mechanism, 171 - first wedge-shaped block, 172 - second wedge-shaped block, 180 - cross roller bearing, 190 - compression spring, 210 - three-way force sensor, 220 - clamping mechanism, 221 - spring barrel clamp, 222 - locking nut, 230 - tool holder pull pin, 240 - clamping groove.

[0025] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0030] Embodiments

[0031] Referring to Figures 1-2 The present embodiment provides an anti-overload tool holder device, comprising a first tool holder 110 and a second tool holder 120, the first tool holder 110 is used to connect the main shaft of the machine tool (not shown in the figure), the second tool holder 120 is used to connect the tool 130 (mainly milling cutter), the coupling torque converter 140 is arranged between the first tool holder 110 and the second tool holder 120, the coupling torque converter 140 is used to transmit the torque between the first tool holder 110 and the second tool holder 120, at least two arc-shaped sliding grooves 150 are formed on the first tool holder 110 and the second tool holder 120, which are located outside the coupling torque converter 140, the center of the arc-shaped sliding groove 150 corresponds to the axis of the first tool holder 110, and the adjacent arc-shaped sliding grooves 150 between the first tool holder 110 and the second tool holder 120 are provided with a slidable guide sliding pin 160.

[0032] In the embodiment, the shank is split to form a first shank 110 and a second shank 120, and the first shank 110 and the second shank 120 are fastened and connected through a guide sliding pin 160, so as to clamp the coupling variable torque converter 140 between the first shank 110 and the second shank 120. When the first shank 110 is connected to the machine tool spindle, the machine tool spindle drives the first shank 110 to rotate, and the coupling variable torque converter 140 transmits torque between the first shank 110 and the second shank 120 by friction, so as to drive the second shank 120 and the tool 130 at the end of the second shank 120 to rotate synchronously, so as to process the machining material by the tool 130. When the rotating speed exceeds the rated torque, the second shank 120 and the coupling variable torque converter 140 will rotate relatively at this time, that is, the second shank 120 and the first shank 110 rotate relatively, and the guide sliding pin 160 also slides along the arc-shaped sliding groove 150 to the corresponding position, so as to realize that the first shank 110 and the second shank 120 can rotate relatively when the difficult-to-machine material exceeds the spindle load, so as to realize the spindle torque overload protection, reduce the risk of shank fracture, and improve the service life.

[0033] As an optional embodiment, the coupling variable torque converter 140 includes a first track disc 141 and a second track disc 142 embedded between the first shank 110 and the second shank 120, and a plurality of groups of rolling bodies in annular array are arranged between the first track disc 141 and the second track disc 142, so that the first track disc 141 and the second track disc 142 rotate relatively when the overload condition is reached; wherein the overload condition is that the torque between the first shank 110 and the second shank 120 exceeds the rated torque.

[0034] In the embodiment, when the overload condition is reached by exceeding the rated torque, the second track disc 142 will rotate relatively with the first track disc 141 under the action of the rolling bodies, so as to cooperate with the relative rotation between the second shank 120 and the first shank 110. Therefore, the coupling variable torque converter 140 not only plays a role in transmitting torque, but also plays a role in cooperating with rotation to realize variable torque, achieving two goals at once.

[0035] As an optional embodiment, each rolling body includes two mutually contacting rolling balls 143, the rolling balls 143 are respectively provided with a conical surface 1431 and a spherical surface 1432, and the first track disc 141 and the second track disc 142 are respectively provided with spherical grooves in contact with the corresponding spherical surfaces 1432.

[0036] In the embodiment, when the first track disc 141 and the second track disc 142 rotate relatively, the two adjacent balls 143 rotate with each other through the conical surface 1431, and the upper and lower balls 143 rotate with the spherical groove of the first track disc 141 and the second track disc 142 respectively through the spherical surface 1432. When rotating under normal load, the two balls 143 are tightly pressed against each other through the conical surface 1431 and are not easy to rotate, thereby ensuring smooth transmission of the torque. Only when the rated torque is exceeded, the balls 143 are forced to rotate. The structure is compact, the wear is low, and the device is suitable for high-speed rotating working conditions.

[0037] As an optional embodiment, a torque adjusting mechanism 170 is arranged between the coupling torque converter 140 and the second tool holder 120. The torque adjusting mechanism 170 is used to adjust the distance between the coupling torque converter 140 and the second tool holder 120, so as to adjust the rated torque between the first tool holder 110 and the second tool holder 120.

[0038] In the embodiment, according to the material processing characteristics, the torque adjusting mechanism 170 is used to adjust the distance between the coupling torque converter 140 and the second tool holder 120, so as to adjust the pressing force, thereby adjusting the friction force of the coupling torque converter 140 between the first tool holder 110 and the second tool holder 120, and further realizing the setting of the maximum torque load value of different machine tools or tools, so as to protect the machine tools and tools, improve the flexibility, and improve the versatility.

[0039] As an optional embodiment, the torque adjusting mechanism 170 includes a first wedge-shaped block 171 and a second wedge-shaped block 172 which are in contact with each other. The opposite side of the first wedge-shaped block 171 and the second wedge-shaped block 172 is a bevel which is in contact with each other. The other side of the first wedge-shaped block 171 is a flat surface which is in contact with the coupling torque converter 140. The other side of the second wedge-shaped block 172 is a flat surface which is in contact with the second tool holder 120.

[0040] In the embodiment, the flat surface of the first wedge-shaped block 171 abuts against the second track disc 142. When the second wedge-shaped block 172 moves inward, the first wedge-shaped block 171 is lifted upward through the bevel and is in a self-locking state. At this time, the coupling torque converter 140 is subjected to a larger pressure and transmits a larger torque and force. Similarly, when the second wedge-shaped block 172 moves outward, the first wedge-shaped block 171 is loosened downward under the action of gravity. At this time, the coupling torque converter 140 is subjected to a smaller pressure and transmits a smaller torque and force. Therefore, the second wedge-shaped block 172 can be moved inward or outward to a corresponding position according to the required rated torque, and then the second wedge-shaped block 172 is fixed on the second tool holder 120 through a locking member (such as a screw or a fastening pin), so as to realize the adjustment of the rated torque.

[0041] As an optional implementation, a cross roller bearing 180 is arranged between the first tool holder 110 and the second tool holder 120, and the cross roller bearing 180 is sleeved outside the coupling torque converter 140. Here, the cross roller bearing 180 plays a role in cooperating the relative rotation of the first tool holder 110 and the second tool holder 120, and also plays a role in torque transmission between the first tool holder 110 and the second tool holder 120. It should be noted that the cross roller bearing 180 is a special type of bearing with a split inner ring and a rotating outer ring. Due to its special structure, it is commonly used as a joint bearing in industrial robots.

[0042] As an optional implementation, the guide sliding pin 160 includes a first sliding pin and a second sliding pin. The first sliding pin is slidingly arranged in the arc-shaped sliding groove 150 of the first tool holder 110, and the second sliding pin is slidingly arranged in the arc-shaped sliding groove 150 of the second tool holder 120. The first sliding pin and the second sliding pin are connected by threads.

[0043] In this embodiment, when the distance between the coupling torque converter 140 and the second tool holder 120 is adjusted by the torque adjusting mechanism 170, the distance between the second tool holder 120 and the first tool holder 110 also changes. At this time, the first sliding pin and the second sliding pin can be connected by threads, so as to correspondingly adjust the overall length of the guide sliding pin 160 to adapt to the change in the distance between the second tool holder 120 and the first tool holder 110, that is, to play a tightening role and a adaptive adjustment role at the same time.

[0044] It should be noted that the end of the first sliding pin and the end of the second sliding pin can be provided with an internal threaded hole and a threaded section, respectively, for threaded connection. The head of the first sliding pin and the head of the second sliding pin are spherical, and the arc-shaped sliding groove 150 is a stepped hole for limiting cooperation with the first sliding pin and the second sliding pin. When relative sliding occurs, the heads of the first sliding pin and the second sliding pin can facilitate smooth sliding in the arc-shaped sliding groove 150.

[0045] As an optional implementation, a compression spring 190 is sleeved outside the guide sliding pin 160, and the compression spring 190 abuts against the first tool holder 110 and the second tool holder 120. The parallelism between the first tool holder 110 and the second tool holder 120 can be ensured by the compression spring 190, and the risk of axis deviation when the second tool holder 120 rotates relatively can be reduced, thereby ensuring the machining accuracy.

[0046] As an optional implementation, the coupling torque converter 140 is connected with a three-way force sensor 210, the three-way force sensor 210 is embedded in the first tool holder 110, and the three-way force sensor 210 is located at the axial center line position of the first tool holder 110.

[0047] In the embodiment, the internal three-way force sensor 210 can collect and transmit data in real time to determine whether the first tool holder 110 and the second tool holder 120 rotate relative to each other. If so, the cutting parameters are optimized, and the tool holder torque is adjusted again, so that the digital closed-loop control can be realized by closed-loop information feedback of the machine tool to guide the adjustment of the output torque and force of the coupling torque converter 140.

[0048] It should be noted that the three-way force sensor 210 is a sensor that can measure the force of an object. It can measure the force applied by the object in three directions, including the forward force, the lateral force, and the vertical force. The working principle of the three-way force sensor 210 is as follows: when an external force acts on the sensor, the spring element inside the sensor will deform, causing the strain gauge to produce strain. The sensitive element will convert these strains into electrical signals and output them. Finally, the signal processing circuit converts the size and direction of the force into digital signals. The three-way force sensor 210 can measure the strain on the strain gauge to determine the size and direction of the external force.

[0049] As an optional embodiment, the second tool holder 120 is connected with a clamping mechanism 220 at the end away from the first tool holder 110, and the second tool holder 120 is connected with the tool 130 through the clamping mechanism 220. The clamping mechanism 220 includes a spring barrel clamp 221 for clamping the tool 130. The second tool holder 120 is provided with a mounting groove at the end, which cooperates with the spring barrel clamp 221. The spring barrel clamp 221 extends out of the mounting groove and is sleeved with a locking nut 222. The locking nut 222 is threadedly sleeved on the outer wall of the second tool holder 120.

[0050] In the embodiment, when the tool 130 is installed, the connecting end of the tool 130 is installed into the spring barrel clamp 221, then the spring barrel clamp 221 is installed into the mounting groove of the second tool holder 120, and finally the locking nut 222 is screwed in to clamp the tool 130 with the spring barrel clamp 221. This has the effect of being detachable and replaceable, so that various types of tools 130 can be assembled, improving the versatility.

[0051] As an optional embodiment, the outer side wall of the first tool holder 110 and the second tool holder 120 is provided with a clamping slot 240. When the tool 130 is installed, the tool holder mounting seat (not shown in the figure) can be used to clamp the clamping slot 240, so as to facilitate the subsequent clamping work of the tool 130.

[0052] As an optional embodiment, the first tool holder 110 is connected with a tool holder pull pin 230 at one end away from the second tool holder 120, and the first tool holder 110 is clamped on the machine tool spindle through the tool holder pull pin 230, so that the improvement can be made based on the traditional BT tool holder, the original machine tool spindle clamping mode can be directly applied to engineering without changing, and it can be popularized to other tool holders, such as HSK tool holder.

[0053] Working principle: the tool holder mounting seat is clamped in the clamping groove 240 to clamp the tool 130, and then the torque adjusting mechanism 170 is adjusted, when the second wedge block 172 moves inward, the first wedge block 171 is lifted upward through the inclined surface, and the self-locking state is realized, at this time the coupling torque converter 140 is subjected to greater pressure, and greater torque and force are transmitted, when the second wedge block 172 moves outward, the first wedge block 171 moves downward under the action of gravity, at this time the coupling torque converter 140 is subjected to smaller pressure, and the transmitted torque and force are reduced, so that the coupling torque converter 140 can be adjusted to the minimum load torque of the three according to the characteristics of the material to be processed, the characteristics of the tool 130 used, and the characteristics of the machine tool spindle, the tool holder pull pin 230 is clamped on the matching machine tool spindle, milling is carried out, the tool holder can collect and transmit data in real time through the internal three-way force sensor 210 to judge whether the first tool holder 110 and the second tool holder 120 rotate relatively, if so, the cutting parameters are optimized, so that the tool holder torque is adjusted again, at the same time, when the torque exceeds the rated torque during processing, the second tool holder 120 will rotate relatively with the first tool holder 110 through the crossed roller bearing 180, the guide sliding pin 160, and the ball 143 in the coupling torque converter 140, thereby protecting the machine tool spindle from precision decline caused by overloading.

[0054] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An overload protection tool holder device, characterized in that, The tool includes a first tool holder and a second tool holder. The first tool holder is used to connect to the machine tool spindle, and the second tool holder is used to connect to the cutting tool. A coupling torque converter is provided between the first tool holder and the second tool holder. The coupling torque converter is used to transmit the torque between the first tool holder and the second tool holder. At least two arc-shaped sliding grooves located outside the coupling torque converter are provided on both the first tool holder and the second tool holder. The center of the arc-shaped sliding grooves coincides with the axis of the first tool holder. A slidable guide pin is provided between adjacent arc-shaped sliding grooves between the first tool holder and the second tool holder. The coupling torque converter includes a first track disk and a second track disk embedded between the first tool holder and the second tool holder. Multiple sets of rolling elements arranged in a circular array are provided between the first track disk and the second track disk to cause relative rotation between the first track disk and the second track disk when an overload condition is reached. The overload condition is that the torque between the first tool holder and the second tool holder exceeds the rated torque. Each of the rolling elements includes two balls that are in contact with each other. Each ball has a conical surface and a spherical surface. Adjacent balls are in contact with each other through the conical surface. The first track disk and the second track disk have spherical grooves that are in contact with the corresponding spherical surfaces on their adjacent sides.

2. The anti-overload tool holder device as described in claim 1, characterized in that, A torque adjustment mechanism is also provided between the coupling torque converter and the second tool holder. The torque adjustment mechanism is used to adjust the distance between the coupling torque converter and the second tool holder to adjust the rated torque between the first tool holder and the second tool holder.

3. The anti-overload tool holder device as described in claim 2, characterized in that, The torque adjustment mechanism includes a first wedge block and a second wedge block that are in contact with each other. The opposite sides of the first wedge block and the second wedge block are inclined surfaces that are in contact with each other. The other side of the first wedge block is a plane that is in contact with the coupling torque converter, and the other side of the second wedge block is a plane that is in contact with the second tool holder.

4. The anti-overload tool holder device as described in claim 2, characterized in that, A crossed roller bearing is also provided between the first tool holder and the second tool holder, and the crossed roller bearing is sleeved on the outside of the coupling torque converter.

5. The anti-overload tool holder device as described in claim 2, characterized in that, The guide pin includes a first guide pin and a second guide pin. The first guide pin is slidably disposed in the arc-shaped groove of the first tool holder, and the second guide pin is slidably disposed in the arc-shaped groove of the second tool holder. The first guide pin and the second guide pin are connected by a thread.

6. The anti-overload tool holder device as described in claim 5, characterized in that, A compression spring is fitted on the outside of the guide pin, and the compression spring abuts against the first tool holder and the second tool holder.

7. The anti-overload tool holder device as described in claim 2, characterized in that, The coupling torque converter is connected to a triaxial force sensor, which is embedded in the first tool holder and located at the axis of the first tool holder.

8. The anti-overload tool holder device as described in claim 1, characterized in that, The end of the second tool holder away from the first tool holder is connected to a clamping mechanism, and the second tool holder is connected to the tool through the clamping mechanism.

9. The anti-overload tool holder device as described in claim 8, characterized in that, The clamping mechanism includes a spring collet for clamping the tool. The end of the second tool holder has a mounting groove that mates with the spring collet. The spring collet extends out of the mounting groove and is fitted with a locking nut. The locking nut is threaded onto the outer wall of the second tool holder.

10. An overload protection tool holder device as described in claim 1 or 9, characterized in that, Both the first and second tool holders have clamping slots on their outer side walls.

11. The anti-overload tool holder device as described in claim 1, characterized in that, The end of the first tool holder away from the second tool holder is connected to a tool holder pull stud, and the first tool holder is clamped to the machine tool spindle by the tool holder pull stud.

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