Tool changer for a numerically controlled machine tool

Abstract

The application discloses a tool changing device of a numerical control machine tool, comprising: a tool holder mechanism, comprising a tool holder body and clamping components attached to both sides of the tool holder body in a linear direction, the clamping components comprising a first clamping arm and a second clamping arm, the first clamping arm and the second clamping arm defining a clamping slot at the head thereof, the clamping slots on both sides of the tool holder body facing opposite directions, at least the first clamping arm being configured to be movable relative to the tool holder body so as to enable the first clamping arm to elastically approach and move away from the second clamping arm; a driving mechanism, having a fixed sleeve and a rotating rod penetrating the fixed sleeve, the rotating rod and the fixed sleeve being inserted into the middle part of the tool holder body and the rotating rod being fixedly connected with the tool holder body, the tool holder body being driven to rotate relative to the fixed sleeve by the rotating rod; and a braking mechanism, which, in response to the rotation of the tool holder body relative to the fixed sleeve, applies braking to the first clamping arm or releases the first clamping arm.

Description

Technical Field

[0001] This invention relates to a related instrument for CNC machine tools, and more particularly to a tool changing device for CNC machine tools. Background Technology

[0002] As is known, the tool changing device of a CNC machine tool is used to install the tool from the tool magazine onto the tool head of the machine tool and simultaneously remove the tool from the tool head and deliver it to the tool magazine. A typical tool changing device includes a drive mechanism and a tool holder mechanism. The tool holder mechanism includes a straight tool holder body with two ends in a linear direction. The drive mechanism is used to drive the tool holder body to rotate. The two ends of the tool holder body are respectively configured with slots, and the two slots face opposite directions. When a tool change is required, the tool to be removed from the tool head and the tool to be used in the tool magazine are respectively locked into the slots by driving the tool holder body to rotate. However, by rotating 180 degrees, the tool to be removed and the tool to be used are respectively delivered and attached to the tool magazine and the tool head.

[0003] A chuck typically consists of a fixed arm and a torsion arm that can be twisted at a certain angle and reset after twisting by means of a spring, so that the tool shaft is locked in place by the torsion arm after passing through the chuck's opening.

[0004] The aforementioned tool changing device in the prior art has the following drawbacks:

[0005] 1. There is a contradiction in configuring the torque of the torsion arm: the smaller the torque, the worse the stability of the tool being held in the tool holder body, resulting in severe radial movement of the tool relative to the tool holder body when the tool holder is rotated. However, the smaller the torque, the easier it is to separate from the slot and attach to the tool magazine and tool head. The larger the torque, the better the stability of the tool being held in the tool holder body, but the less likely it is to separate from the slot and attach to the tool magazine and tool head.

[0006] 2. The opening of the slot and its jaw cannot adapt to the tool size, resulting in a tool holder body of one model being able to better fit only one size and model of tool. Summary of the Invention

[0007] In view of the above-mentioned technical problems existing in the prior art, the present invention provides a tool changing device for CNC machine tools.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A tool changing device for a CNC machine tool, comprising:

[0010] A tool holder mechanism includes a tool holder body and locking components respectively attached to both sides of the tool holder body in a linear direction. The locking components include a first locking arm and a second locking arm, the first locking arm and the second locking arm defining a locking groove at their heads. The locking grooves on both sides of the tool holder body face opposite directions. The first locking arm is configured to be movable relative to the tool holder body so that the first locking arm can elastically approach and move away from the second locking arm.

[0011] A driving mechanism having a fixed sleeve and a rotating rod passing through the fixed sleeve, the rotating rod and the fixed sleeve being inserted into the middle of the handle body and the rotating rod being fixedly connected to the handle body, the handle body being rotated relative to the fixed sleeve by the drive of the rotating rod;

[0012] A braking mechanism that brakes or releases the first locking arm in response to rotation of the tool holder body relative to the fixed sleeve.

[0013] Preferably, the second locking arm is configured to be movable relative to the tool holder body.

[0014] Preferably, a first guide groove and a second guide groove extending linearly are provided on each side of the tool holder body; the arm body of the first locking arm and the arm body of the second locking arm extend into the first guide groove and the second guide groove, respectively; wherein:

[0015] An installation space is provided between the first guide groove and the second guide groove, and the installation space communicates with the first guide groove and the second guide groove respectively. A gear is installed in the installation space.

[0016] Linear teeth are provided on the arm body of the first snap-fit ​​arm and the arm body of the second snap-fit ​​arm for meshing with the gear.

[0017] Preferably, the braking mechanism includes:

[0018] An actuating structure, comprising a radial recess formed on the outer wall of the fixed sleeve;

[0019] A friction block having a friction surface that passes through the sidewall of the first guide groove and faces the sidewall of the arm body of the first snap-fit ​​groove;

[0020] A transmission rod, disposed between the friction block and the fixed sleeve, rotates with the handle body relative to the fixed sleeve. In response to the end of the transmission rod located on the fixed sleeve sliding from the radial recess of the fixed sleeve onto the outer wall, the transmission rod drives the friction block to move toward the first snap-fit ​​arm to brake it. In response to sliding into the radial recess from the outer wall, the braking of the friction block on the first snap-fit ​​arm is released.

[0021] Preferably, the transmission rod is configured with a ball head at one end of the fixed sleeve and a cone head at one end of the friction block; a transmission bead is provided between the tail of the friction block and the cone head of the transmission rod; wherein:

[0022] The transmission rod is provided with a helical groove so that the transmission rod can produce axial extension and contraction.

[0023] Preferably, a groove is formed on the friction surface of the friction block, and a spring is installed at the bottom of the groove. The head of the spring is configured in an arc shape and protrudes from the friction surface to abut against the side wall of the first snap-fit ​​arm and separate the friction surface from the first snap-fit ​​arm.

[0024] Preferably, a torsion spring is installed between the gear and the tool holder body, and the torsion spring provides torque for the rotation of the gear.

[0025] Preferably, the heads of the first latching arm and the second latching arm each have two opposing inclined walls, and the two inclined walls define the latching slot; wherein:

[0026] Both the first latching arm and the second latching arm are equipped with guide rollers, which protrude from the inclined wall.

[0027] Preferably, both the first guide groove and the second guide groove are provided with slide rails, and the arm body of the first snap-fit ​​arm and the arm body of the second snap-fit ​​arm respectively slide in cooperation with the slide rails of the first guide groove and the second guide groove.

[0028] Preferably, the friction block is horseshoe-shaped.

[0029] Compared with the prior art, the advantages of the tool changing device for CNC machine tools disclosed in this invention are:

[0030] 1. The tool changing device provided by the present invention enables the tool holder body to maintain the engagement by only the torque provided by the torsion spring when it is rotated to the angle where the tool needs to be changed, thereby making the tool changing smoother. When the tool holder body is driven to rotate to transport the tool, the braking mechanism responds to the rotation of the tool holder body and automatically brakes the engagement arm that defines the slot to suppress the movement of the engagement arm, so that the tool can be transported stably without falling out of the slot.

[0031] 2. The tool changing device provided by the present invention can clamp tools with a larger radial dimension range by moving the two clamping arms relative to each other. Furthermore, by making the two clamping arms mesh with the gear and rotate, the transport trajectory and transport position of the tool will not change due to the different radial dimensions of the tool.

[0032] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0033] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0034] Figure 1 This is a front view of a tool changing device provided in an embodiment of the present invention.

[0035] Figure 2 This is a front view of the tool holder mechanism in the tool changing device provided in an embodiment of the present invention.

[0036] Figure 3 for Figure 2 A sectional view along the AA direction (the tool is being changed).

[0037] Figure 4 for Figure 3 A magnified view of part B.

[0038] Figure 5 for Figure 2 AA-direction cross-sectional view (tool transport state).

[0039] Figure 6 for Figure 5 A magnified view of part C.

[0040] Figure label:

[0041] 10-Tool holder mechanism; 11-Tool holder body; 111-First guide groove; 112-Second guide groove; 12-Snap-fit ​​component; 121-First snap-fit ​​arm; 1211-First end; 1212-First inclined wall; 1213-First arm body; 122-Second snap-fit ​​arm; 1221-Second end; 1222-Second inclined wall; 1223-Second arm body; 123-Snap-fit ​​groove; 124-Guide roller; 125-Gear; 126-Linear gear; 127-Torsion spring; 13-Brake mechanism; 131-Friction block; 1311-Friction surface; 1312-Counterpart; 1313-Spring; 132-Transmission rod; 1321-Helical groove; 133-Transmission ball; 20-Drive mechanism; 21-Rotating rod; 22-Fixed sleeve; 221-Radial recess; 100-Tool. Detailed Implementation

[0042] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0044] An embodiment of the present invention discloses a tool changing device for replacing the tool 100 on the tool head of a CNC machine tool with the tool 100 in the tool magazine. The tool changing device provided by the present invention includes: a tool holder mechanism 10, a drive mechanism 20, and a braking mechanism 13. The drive mechanism 20 is used to drive the tool holder mechanism 10 to rotate. Preferably, the tool holder of the tool being replaced is a PSC tool holder.

[0045] like Figures 1 to 6As shown, the handle mechanism 10 includes a handle body 11 and a locking component 12. The handle body 11 has two ends in a linear direction, and a first guide groove 111 and a second guide groove 112 extending linearly from each end of the handle body 11 into the interior of the handle body 11 are provided. There are two locking components 12, which are respectively attached to the two sides of the handle body 11. Each locking component 12 includes a first locking arm 121 and a second locking arm 122. The first locking arm 121 includes an integrally formed first arm body 1213 and a first end 1211, and the second locking arm 122 includes an integrally formed second arm body 1223 and a second end. 1221, the first arm body 1213 of the first latching arm 121 extends from the end of the handle body 11 into the first guide groove 111, and the first end 1211 of the first latching arm 121 is located outside the end of the handle body 11, so that the first latching arm 121 can move relative to the handle body 11 along the first guide groove 111. The second arm body 1223 of the second latching arm 122 extends from the end of the handle body 11 into the second guide groove 112, and the second end 1221 of the second latching arm 122 is located outside the end of the handle body 11, so that the second latching arm 122 can move relative to the handle body 11 along the second guide groove 112. A first inclined wall 1212 is disposed on the first end 1211, and a second inclined wall 1222 is disposed on the second end 1221. The first inclined wall 1212 and the second inclined wall 1222 define a slot 123 that allows the shaft of the tool 100 to enter, and the slots 123 defined by the first end 1211 and the second end 1221 of the two locking members 12 at both ends of the tool holder body 11 face opposite directions. Preferably, slide rails are disposed in both the first guide groove 111 and the second guide groove 112. The first arm body 1213 of the first locking arm 121 slides along the first guide groove 111 under the guidance of the slide rails, and the second arm body 1223 of the second locking arm 122 slides along the second guide groove 112 under the guidance of the slide rails.

[0046] Guide rollers 124 are installed on the first end 1211 and the second end 1221 on each side. The two guide rollers 124 are located at the opening of the slot 123 and protrude from the corresponding inclined wall. That is, the guide roller 124 on the first end 1211 protrudes from the first inclined wall 1212, and the guide roller 124 on the second end 1221 protrudes from the second inclined wall 1222. Since the guide rollers 124 are arranged at the opening of the slot 123 and protrude from the corresponding inclined wall, the guide rollers 124 guide the tool 100 (e.g., the tool 100 on the tool head and the tool 100 on the tool magazine) into the slot 123 through the opening. On the other hand, by inhibiting the movement of the first retaining arm 121 and the second retaining arm 122, the guide rollers 124 restrict the tool 100 that has entered the slot 123 from being dislodged from the slot 123.

[0047] In this invention, an installation space is configured in the area between the first guide groove 111 and the second guide groove 112 on each side of the handle body 11. The installation space is connected to both the first guide groove 111 and the second guide groove 112, so that the first arm body 1213 of the first locking arm 121 and the second arm body 1223 of the second locking arm 122 are exposed in the installation space. A gear 125 is installed in the installation space. A row of linear teeth 126 is formed on the side wall of the first arm body 1213 and the second arm body 1223 on the side of the installation space. The gear 125 meshes with the linear teeth 126 on both the first arm body 1213 and the second arm body 1223 at the same time. In this way, the first locking arm 121 and the second locking arm 122 can move in opposite directions relative to the handle body 11 and the amount of movement is the same.

[0048] In this invention, a torsion spring 127 is sleeved on the end shaft of the gear 125, and the two ends of the torsion spring 127 are respectively connected to the end of the gear 125 and the end face of the handle body 11, so that when the gear 125 rotates, the torsion spring 127 is used to provide torque for the rotation of the gear 125. Thus, when the tool holder body 11 is driven, causing the slots 123 at both ends to rotate simultaneously to the tool 100 on the tool magazine and the tool 100 on the tool head, the tool 100 abuts against the guide rollers 124, forcing the first locking arm 121 and the second locking arm 122 to move away from each other. At the same time, the arm bodies of the two locking arms mesh with the gear 125, forcing the gear 125 to rotate. The torsion spring 127 accumulates torque (or elastic potential energy), thus increasing the opening of the slot 123 to allow the tool 100 to enter the slot through the two opposing guide rollers 124. After entering the slot, the torsion spring 127 releases its elastic potential energy to make the two locking arms engage with each other, thereby using the two opposing guide rollers 124 to lock the tool 100 in the slot 123. When the tool holder body 11 is driven to rotate 180° and the tool 100 needs to be changed, the binding force between the tool 100 and the tool magazine or tool head needs to overcome the force of the guide roller 124 on the tool 100, forcing the two locking arms to move away and break free from the slot 123 and attach to the tool magazine and tool head. Therefore, the torque of the torsion spring 127 needs to be as small as possible to prevent the binding force between the tool 100 and the tool magazine or tool head from being unable to overcome the force of the guide roller 124 on the tool 100.

[0049] The drive mechanism 20 has a fixed sleeve 22 and a rotating rod 21 passing through the fixed sleeve 22. The rotating rod 21 is a drive component and can rotate relative to the fixed sleeve 22. The ends of the fixed sleeve 22 and the rotating rod 21 are coaxially passed through the middle region of the tool holder body 11. The rotating rod 21 is fixedly connected to the tool holder body 11. Thus, the rotating rod 21 can drive the tool holder body 11 to rotate, thereby causing the tool holder body 11 to rotate relative to the fixed sleeve 22.

[0050] like Figure 4 As shown, a braking mechanism 13 is provided between the side wall of the first arm body 1213 of the first locking arm 121 on each side of the handle body 11 and the fixing sleeve 22. Specifically, a radial recess 221 is provided on the outer wall of the fixing sleeve 22. The braking mechanism 13 on each side includes a friction block 131, a transmission rod 132 and a transmission ball 133. The friction block 131 has a rectangular block-shaped main body and a columnar tail. A friction surface 1311 is formed on the front side of the main body, so that the friction block 131 faces the side wall of the first arm body 1213 and can approach or move away from the side wall. Furthermore, a groove 1312 is provided on the friction surface 1311 of the friction block 131. A spring piece 1313 is installed at the bottom of the groove 1312. The head of the spring piece 1313 is configured in an arc shape and protrudes from the friction surface 1311 to abut against the side wall of the first locking arm 121 and separate the friction surface 1311 from the side wall. The tail of the friction block 131 is located in the radial hole, and the transmission rod 132 is arranged in the transverse hole perpendicular to the radial hole. The transverse hole extends radially to the fixed sleeve 22. A ball head is provided at one end of the transmission rod 132 on the fixed sleeve 22, and a cone head is provided on one side of the transmission rod 132 on the friction block 131. A transmission bead 133 is located between the cone head and the friction block 131. A helical groove 1321 is provided on the transmission rod 132 to enable the transmission rod 132 to perform axial extension and retraction.

[0051] like Figure 3 and Figure 4 As shown, when the rotating rod 21 drives the tool holder body 11 to rotate to the point where the slots on both sides of the tool holder body 11 reach the tool magazine and the tool 100, at this time, the ball head of the transmission rod 132 of the braking mechanism 13 on both sides rotates to the position opposite to the radial recess 221 of the fixed sleeve 22. At this time, the spring piece 1313 at the friction surface 1311 of the friction block 131 protrudes from the friction surface 1311 and separates the friction surface 1311 from the side wall of the first arm body 1213, thereby releasing the braking of the friction block 131 on the first arm body 1213 and releasing the first locking arm 121. In this way, the tool 100 can only smoothly enter the slot 123 or disengage from the slot 123 by overcoming the torque of the torsion spring 127. Figure 5 and Figure 6As shown, when the tool 100 enters the slot 123 and the tool holder body 11 is driven to rotate only a small angle, the ball head of the transmission rod 132 of the braking mechanism 13 slides from the radial recess 221 onto the outer wall of the fixed sleeve 22. During the process of sliding onto the outer wall, the transmission rod 132 is driven to move towards the friction block 131 because it slides from the radial recess 221 onto the outer wall. Thus, the friction block 131 is driven to move towards the first arm body 1213 by means of the transmission ball 133, so that the spring piece 1313 retracts into the friction surface 1311 and at the same time, the friction surface 1311 abuts against the side wall of the first arm body 1213, thereby inhibiting the movement of the first locking arm 121. Thus, the tool 100 is stably locked in the slot 123 without being affected by the torque provided by the torsion spring 127. Therefore, during the movement of the tool 100 by the tool holder body 11, the tool 100 can be stably locked in the slot 123. When the tool holder body 11 rotates 180 degrees, the ball head of the transmission rod 132 slides back into the radial recess 221, thereby causing the friction block 131 to release the first locking arm 121 again, allowing the tool 100 to be easily released and engaged with the tool head and tool magazine. The purpose of configuring the helical groove 1321 on the transmission rod 132 is to match the overall movement of the transmission rod 132 with the movement of the friction block 131 by axially extending and retracting the transmission rod 132, thereby avoiding the situation where the ball head of the transmission rod 132 has slid onto the outer surface of the fixed sleeve 22 before the friction block 131 has pressed against the side wall of the first arm body 1213, or the friction surface 1311 of the friction block 131 has pressed against the side wall of the first arm body 1213 before the ball head of the transmission rod 132 has slid onto the outer wall of the fixed sleeve 22 due to the low machining accuracy of the radial recess 221. The purpose of configuring the spring piece 1313 on the friction block 131 is to reset the spring piece 1313 when the tool holder body 11 rotates to the slot 123 and reaches the tool head or tool magazine, thereby separating the friction block 131 and avoiding the friction block 131 from contacting the side wall of the first arm body 1213 at this time, so as to increase the resistance of the tool 100 entering the slot 123 or the tool 100 disengaging from the slot 123.

[0052] The tool changing device provided by this invention has at least the following advantages:

[0053] 1. The tool changing device provided by the present invention enables the tool holder body 11 to maintain the engagement by only using the torque provided by the torsion spring 127 when it is rotated to the angle where the tool 100 needs to be changed, thereby making the tool changing smoother. When the tool holder body 11 is driven to rotate to transport the tool 100, the braking mechanism 13 responds to the rotation of the tool holder body 11 and automatically brakes the engagement arm that defines the slot 123 to suppress the movement of the engagement arm, so that the tool 100 can be transported stably without falling out of the slot 123.

[0054] 2. The tool changing device provided by the present invention can clamp a tool 100 with a larger radial dimension range by moving the two clamping arms relative to each other. Furthermore, by making the two clamping arms mesh with the gear 125, the transport trajectory and transport position of the tool 100 will not change due to the different radial dimensions of the tool 100.

[0055] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0056] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being possible in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0057] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A tool changing device for a CNC machine tool, characterized in that, include: A tool holder mechanism includes a tool holder body and locking components respectively attached to both sides of the tool holder body in a linear direction. The locking components include a first locking arm and a second locking arm, the first locking arm and the second locking arm defining a locking groove at their heads. The locking grooves on both sides of the tool holder body face opposite directions. The first locking arm is configured to be movable relative to the tool holder body so that the first locking arm can elastically approach and move away from the second locking arm. A driving mechanism having a fixed sleeve and a rotating rod passing through the fixed sleeve, the rotating rod and the fixed sleeve being inserted into the middle of the handle body and the rotating rod being fixedly connected to the handle body, the handle body being rotated relative to the fixed sleeve by the drive of the rotating rod; A braking mechanism that brakes or releases the first locking arm in response to rotation of the tool holder body relative to the fixed sleeve.

2. The tool changing device for a CNC machine tool according to claim 1, characterized in that, The second locking arm is configured to be movable relative to the tool holder body.

3. The tool changing device for a CNC machine tool according to claim 2, characterized in that, A first guide groove and a second guide groove extending linearly are provided on each side of the tool holder body; the arm body of the first locking arm and the arm body of the second locking arm extend into the first guide groove and the second guide groove, respectively; wherein: An installation space is provided between the first guide groove and the second guide groove, and the installation space communicates with the first guide groove and the second guide groove respectively. A gear is installed in the installation space. Linear teeth are provided on the arm body of the first snap-fit ​​arm and the arm body of the second snap-fit ​​arm for meshing with the gear.

4. The tool changing device for a CNC machine tool according to claim 3, characterized in that, The braking mechanism includes: An actuating structure, comprising a radial recess formed on the outer wall of the fixed sleeve; A friction block having a friction surface that passes through the sidewall of the first guide groove and faces the sidewall of the arm body of the first snap-fit ​​groove; A transmission rod, disposed between the friction block and the fixed sleeve, rotates with the handle body relative to the fixed sleeve. In response to the end of the transmission rod located on the fixed sleeve sliding from the radial recess of the fixed sleeve onto the outer wall, the transmission rod drives the friction block to move toward the first snap-fit ​​arm to brake it. In response to sliding into the radial recess from the outer wall, the braking of the friction block on the first snap-fit ​​arm is released.

5. The tool changing device for a CNC machine tool according to claim 4, characterized in that, The transmission rod is configured with a ball head at one end of the fixed sleeve and a cone head at one end of the friction block; a transmission bead is provided between the tail of the friction block and the cone head of the transmission rod; wherein: The transmission rod is provided with a helical groove so that the transmission rod can produce axial extension and contraction.

6. The tool changing device for a CNC machine tool according to claim 4, characterized in that, The friction surface of the friction block is provided with a groove, and a spring is installed at the bottom of the groove. The head of the spring is configured with an arc-shaped structure and protrudes from the friction surface to abut against the side wall of the first snap-fit ​​arm and separate the friction surface from the first snap-fit ​​arm.

7. The tool changing device for a CNC machine tool according to claim 3, characterized in that, A torsion spring is installed between the gear and the handle body, and the torsion spring provides torque for the rotation of the gear.

8. The tool changing device for a CNC machine tool according to claim 3, characterized in that, The heads of the first and second latching arms each have two opposing inclined walls, which define the latching slot; wherein: Both the first latching arm and the second latching arm are equipped with guide rollers, which protrude from the inclined wall.

9. The tool changing device for a CNC machine tool according to claim 3, characterized in that, Both the first guide groove and the second guide groove are provided with slide rails, and the arm body of the first snap-fit ​​arm and the arm body of the second snap-fit ​​arm respectively slide in cooperation with the slide rails of the first guide groove and the second guide groove.

10. The tool changing device for a CNC machine tool according to claim 3, characterized in that, The friction block is horseshoe-shaped.

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