A small non-powered self-locking knife claw assembly device and its use method

Abstract

The present invention relates to the technical field of numerical control machine tools, and in particular to a small-sized non-powered self-locking knife claw assembly device and a method for using the same, comprising: a support seat; two knife claws, one end of which is provided with a bayonet, and the other end of which is provided with a spring positioning column; a second spring installation groove is provided on the opposite side; a first spring; two second springs are installed in the spring installation groove, two middle rotating blocks have protrusions attached to the locking slide block; the locking slide block slides along the knife claw in and out direction; a guide column is provided at the end, which is divided into a locking section and an unlocking section, a locking guide block is fixed on the device frame, and completes self-locking together with the guide column; an unlocking push rod pushes the locking slide block to unlock the knife claw assembly. The present invention realizes self-locking without an additional power source through the cooperation of the knife claw, the middle rotating block, the locking slide block and the locking guide block, greatly simplifying the storage and fixing operation of the tool; sufficient locking force is provided through hard contact, ensuring that the tool is stable and reliable during use, and ensuring the safety of tool storage.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, and in particular to a small-sized non-powered self-locking tool claw assembly device and a use method thereof. Background Art

[0002] CNC machine tools are widely used in modern manufacturing for the processing of precision parts. The automatic tool replacement system is an important part of the automated processing of CNC machine tools, and the tool magazine is one of the core components. The tool claw is a key component in the tool magazine for grabbing and fixing the tool, and its design directly affects the clamping stability and replacement efficiency of the tool.

[0003] In modern mechanical processing and automated production lines, tool replacement and fixation is a key link. Traditional tool claws usually have the following problems when fixing tools: the tool claws are not locked after grabbing the tool, so the tool may loosen or fall off when the tool holder runs at high speed; the tool claw spring is prone to fatigue, and the spring inside the tool claw may lose its elasticity after long-term use, resulting in insufficient clamping force. A stable and efficient new tool claw structure and its use method are urgently needed. Summary of the invention

[0004] In view of at least one of the above technical problems, the present invention provides a small-sized non-powered self-locking knife claw assembly device and a method of using the same, which adopts the mechanical self-locking principle to improve the system reliability and clamping stability.

[0005] According to a first aspect of the present invention, a small-sized non-powered self-locking knife claw assembly device is provided, comprising a support seat, two knife claws, a second spring, a first spring, two second springs, two middle rotating blocks, a locking slider, a locking guide block and an unlocking push rod, wherein:

[0006] A support base, used to provide an installation space;

[0007] Two knife claws are symmetrically arranged on both sides of the support base; each knife claw is rotatably connected to the support base; one end of each knife claw is provided with a bayonet for clamping a knife, and the other end is provided with a spring positioning column; the opposite sides of the two knife claws are provided with spring mounting grooves;

[0008] A first spring is sleeved on the spring positioning column and compressed between the two knife claws;

[0009] Two second springs are respectively installed in the spring installation grooves on the two knife claws, and are respectively compressed between the two middle rotating blocks and the knife claws;

[0010] Two middle rotating blocks are symmetrically arranged on both sides of the support seat; one end of each middle rotating block close to the tool is rotatably connected to the support seat; the other end has a protrusion that fits the side of the locking slide;

[0011] The locking slide slides along the tool entry and exit direction; the locking slide has a guide column at the end of the tool entry direction; the locking slide is provided with a locking section and an unlocking section, the two sides of the locking section are planes extending along the tool entry and exit direction, and the distance between the two sides of the unlocking section gradually narrows along the tool insertion direction;

[0012] The locking guide block is independently fixed; an inclined surface is arranged on one end of the locking guide block facing the support seat;

[0013] The unlocking push rod is used to push the locking slide block to unlock the knife claw assembly.

[0014] Furthermore, the middle rotating block and the knife claw are provided with a first inclined surface and a second inclined surface respectively. When the knife claw is opened to a maximum angle, the first inclined surface fits with the second inclined surface and makes the protrusion press against the unlocking section of the locking slider.

[0015] Furthermore, there is a locking device on the side of the locking slider attached to the support seat, the locking device includes a locking spring and a locking block, the locking block is installed inside the accommodating space opened by the locking slider and is rotatably connected to the locking slider, and the locking spring is compressed between the locking slider and the locking block; when the protrusion contacts the locking section, the locking block is popped out by the locking spring and stuck on the side of the support seat away from the tool.

[0016] Further, the locking guide block surrounds the tool magazine turntable.

[0017] Furthermore, a spring accommodating groove is provided on one side of the middle rotating block opposite to the knife claw and opposite to the spring mounting groove, a spring supporting groove is provided in the spring accommodating groove, the spring supporting groove is a waist hole structure extending along the entry and exit direction of the tool, and one end of the second spring extends into the spring supporting groove.

[0018] Furthermore, the guide column and the locking guide block are both detachable fixed structures.

[0019] Furthermore, the support seat is provided with a limit block for inserting the locking slider and a groove for limiting the moving direction of the locking slider.

[0020] Furthermore, an oil groove is provided on the contact surface between the locking slide block and the protrusion.

[0021] Furthermore, the unlocking push rod is a pneumatic push rod.

[0022] According to a first aspect of the present invention, a method for using a small-sized non-powered self-locking knife claw assembly device is provided, wherein using the small-sized non-powered self-locking knife claw assembly device comprises the following steps:

[0023] S10: When the tool enters, the tool pushes the locking slider to move in the direction of tool entry, the unlocking section drives the middle rotating block to deviate toward the direction of the tool claw and compresses the second spring, and the guide column moves to above the lowest point of the locking guide block;

[0024] S20: When the cutter disc rotates to change the cutter, the locking guide block drives the guide column to move in the direction of inserting the cutter and continues to drive the locking slider to move in the direction of inserting the cutter, so that the locking section contacts the middle rotating block. At this time, the middle rotating block and the locking slider completely block the movement space in the direction of opening the cutter claws.

[0025] S30: When taking out the knife, the unlocking push rod pushes the locking slider in the direction of taking out the knife, so that the protrusion contacts the unlocking section, so that the knife claw can move and the knife can be taken out.

[0026] The beneficial effects of the present invention are as follows: the present invention realizes self-locking without an additional power source through the cooperation of the knife claw, the middle rotating block, the locking slide block and the locking guide block, greatly simplifying the storage and fixing operation of the tool; through hard contact, the device provides sufficient locking force to ensure that the tool is stable and reliable during use, ensures the safety of tool storage, improves work efficiency, and protects the safety of operators. Its structure is compact and suitable for various limited space applications, and it has the advantages of high reliability and low cost. In short, the device provides an efficient, reliable, safe and economical tool storage and retrieval solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of a small-sized non-powered self-locking knife claw assembly device in an embodiment of the present invention;

[0029] Figure 2 An exploded view of a small-sized non-powered self-locking knife claw assembly device in an embodiment of the present invention;

[0030] Figure 3 It is a bottom view of a small-sized non-powered self-locking knife claw assembly device in an embodiment of the present invention;

[0031] Figure 4 It is a structural schematic diagram of a locking slide block of a small-sized non-powered self-locking knife claw assembly device in an embodiment of the present invention;

[0032] Figure 5 The small-sized non-powered knife lock claw assembly device in the embodiment of the present invention is in the knife storage state. Figure 3 A sectional view of the

[0033] Figure 6 The small-sized non-powered knife lock claw assembly device in the embodiment of the present invention is in the knife storage state. Figure 3A cross-sectional view at point B;

[0034] Figure 7 for Figure 5 Enlarged view of point C;

[0035] Figure 8 The small-sized non-powered self-locking knife claw assembly device in the embodiment of the present invention is clamped in the tool state. Figure 3 A sectional view of the

[0036] Fig. 9 The small-sized non-powered self-locking knife claw assembly device in the embodiment of the present invention is clamped in the tool state. Figure 3 A cross-sectional view at point B;

[0037] Fig.10 for Figure 8 The enlarged view of point D;

[0038] Fig.11 The small-sized non-powered self-locking knife claw assembly device in the embodiment of the present invention is in the self-locking state. Figure 3 A sectional view of the

[0039] Fig.12 The small-sized non-powered self-locking knife claw assembly device in the embodiment of the present invention is in the self-locking state. Figure 3 A cross-sectional view at point B;

[0040] Fig.13 for Fig.11 The enlarged view of point E;

[0041] Fig.14 In the embodiment of the present invention, the small-sized non-powered self-locking knife claw assembly device is used when the tool is not aligned. Figure 3 A sectional view of the

[0042] Fig.15 In the embodiment of the present invention, the small-sized non-powered self-locking knife claw assembly device is used when the tool is not aligned. Figure 3 A cross-sectional view at point B;

[0043] Fig.16 for Fig.14 The enlarged view of F;

[0044] Fig.17 The small-sized non-powered self-locking knife claw assembly device in the embodiment of the present invention is in the unlocked state. Figure 3 Sectional view at point A. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] According to a first aspect of the present invention, a small-sized non-powered self-locking knife claw assembly device is provided. Figures 1 to 17 As shown, it includes a support seat 1, two knife claws 2, a first spring 3, two second springs 4, two middle rotating blocks 5, a locking slider 6, a locking guide block 7 and an unlocking push rod 8. The specific structure of each component is introduced below:

[0049] The support base 1 is used to provide installation space; in specific implementation, the support base 1 can be composed of a bottom plate and an upper cover, and the bottom plate is symmetrically provided with positioning shafts for connecting the knife claws 2 and the middle rotating block 5, and a limit block for limiting the movement of the locking slider 6 and preventing it from falling. The support base 1 is usually fixed on the turntable of the tool magazine. When the turntable rotates, the turntable will drive the support base 1 to rotate, thereby driving the knife claw group to rotate as a whole.

[0050] Two knife claws 2 are symmetrically arranged on both sides of the support base 1; each knife claw 2 is rotatably connected to the support base 1; a bayonet 21 for clamping the tool is arranged at one end of each knife claw 2, and a spring positioning column 22 for fixing the first spring 3 is arranged at the other end; a spring mounting groove 23 is arranged on the opposite side of the two knife claws 2; the function of the knife claw 2 is to clamp the tool. In a specific embodiment, the knife claw 2 is fixed to the support base 1 through the positioning hole on the knife claw 2 through the positioning shaft on the support base 1, and the spring mounting groove 23 is used to install the second spring 4 and provide space for the compression and release of the second spring 4.

[0051] The first spring 3 is sleeved on the spring positioning column 22 and is compressed between the two knife claws 2. The function of the first spring 3 is to push the ends of the two knife claws 2 away from the bayonet 21 away from each other, so that the bayonet 21 generates a clamping force on the tool.

[0052] Two middle rotating blocks 5 are symmetrically arranged on both sides of the support base 1; one end of each middle rotating block 5 close to the tool is rotatably connected to the support base 1; and the other end has a protrusion 51 that fits with the side of the locking slider 6.

[0053] The two second springs 4 are respectively installed in the spring installation grooves 23 on the two knife claws 2, and are respectively compressed between the two middle rotating blocks 5 and the knife claws 2; one end of the second spring 4 is fixed in the spring installation groove 23, and the other end provides pressure to the middle rotating block 5 to push the middle rotating block 5 so that the protrusion 51 of the middle rotating block 5 can fit tightly with the side of the locking slider 6.

[0054] The locking slider 6 slides along the tool entry and exit direction to complete the self-locking of the tool claw group; a guide column 61 is provided at the end of the locking slider 6 in the tool entry direction; the locking slider 6 is divided into a locking section 62 and an unlocking section 63. The two sides of the locking section 62 are planes extending along the tool entry and exit direction, and the distance between the two sides of the unlocking section 63 gradually narrows along the tool insertion direction.

[0055] The locking guide block 7 is independently fixed and is usually directly installed on the frame of the tool magazine and will not move with the rotation of the tool magazine turntable; a slope is set on one end of the locking guide block 7 facing the support seat 1, and the knife claw group achieves self-locking through the slope.

[0056] The unlocking push rod 8 is usually installed at the tool changing position on the frame of the tool magazine, and is used to push the locking slide block 6 to move so as to unlock the two sets of tool claws.

[0057] The specific principle of this knife claw group is as follows:

[0058] When the knife claw assembly is in the self-locking release state, the protrusion 51 of the middle rotating block 5 will always abut against the unlocking section 63 of the locking slide block 6. Figures 5 to 7 As shown, under the action of the second spring 4, the middle rotating block 5 will push the locking slider 6 to extend; and after the tool is inserted, as shown in FIG. Figures 8-10 As shown, the tool will push the extended locking slide 6 back; if the tool needs to be removed, the locking slide 6 will be pushed out again by the middle rotating block 5 as the tool is moved out. Figure 7 and Fig.10 As can be seen from the figure, as long as the protrusion 51 abuts against the unlocking section 63, there will always be a gap between the side wall of the middle rotating block 5 and the knife claw 2. This gap allows the knife claw 2 to be opened and closed, so that the knife claw assembly can freely place and take out the knife.

[0059] When the tool magazine needs to change the tool, the turntable of the tool magazine will start to rotate, and the claw group that was originally in the tool change position and has placed the tool will rotate to the side. As the claw group moves, the guide column 61 will reach the locking guide block 7, and then move along the locking guide block 7. As the inclined surface of the locking guide block 7 rises, the guide column 61 will rise, and then drive the locking slide block 6 to move in the direction of inserting the tool, so that the locking section 62 contacts the protrusion 51 on the middle rotating block 5, as shown in FIG. Figures 11 to 13 As shown, in this case, the knife claw 2, the middle rotating block 5 and the locking slide block 6 are pressed against each other, completely blocking the movement space of the knife claw 2 in the opening direction, locking the knife claw 2, completing the complete locking, and keeping the clamping jaw in a locked state.

[0060] When the knife claw group in the self-locking state moves to the knife taking position for changing the knife, it is necessary to contact the self-locking of the knife claw group. At this time, the unlocking push rod 8 can be driven to push the locking slide block 6 forward, so that the protrusion 51 and the locking section 62 are disengaged and slide to the unlocking section 63, that is, return to the state as shown in the figure. Figures 8-10 In the state shown, the knife claw 2 and the middle rotating block 5 are no longer in contact with each other, so that the knife claw 2 regains the ability to open. At this time, the knife claw 2 can move and the tool can be put in and taken out.

[0061] The small-scale non-powered self-locking tool claw assembly device realizes automatic locking of the tool through the cooperation of two tool claws 2, two second springs 4, two middle rotating blocks 5, locking slide block 6, and locking guide block. It does not require an external power source, is easy to operate, safe and reliable, has a compact structure, is suitable for various spaces, is easy to maintain, and has a high degree of automation and tool management efficiency. It provides a cost-effective tool management solution, which is particularly suitable for mechanical processing and production environments that require frequent tool replacement.

[0062] When the tool is stored, there is a certain position requirement, and the side of the tool with the positioning groove needs to face the tool claw assembly. In the prior art, it is usually necessary to install additional detection equipment to determine the direction of the tool positioning groove, which is costly. However, this tool assembly adopts a physical limit method to prevent the tool from being placed in the wrong position. The specific structure is as follows Figures 5 to 16 As shown, the middle rotating block 5 and the knife claw 2 are provided with a first inclined surface 52 and a second inclined surface 24 respectively. When the knife claw 2 is opened to the maximum angle, as shown in FIG. Fig.16 As shown, the first bevel 52 and the second bevel 24 can fit tightly together, and the protrusion 51 can press against the unlocking section 63 of the locking slider 6. At this time, the distance between the end face of the locking slider 6 facing the tool and the tool entrance of the bayonet 21 in the tool insertion direction is equal to the radius of the tool.

[0063] The limiting principle of the above structure is as follows: when the tool is put in, Figures 14 to 16As shown, if the positioning groove of the tool is not aligned with the locking slider 6 (i.e., the positioning groove is not facing the knife claw assembly), when the tool is put in, when the center of the tool reaches the entrance of the bayonet 21, the side surface will simultaneously abut against the end surface of the locking slider 6 and the entrances of the two bayonet 21, and at this time, the knife claw 2 is opened to the maximum angle, and the first inclined surface 52 will be in contact with the second inclined surface 24, and the protrusion 51 will abut against the unlocking section 63 of the locking slider 6, which will limit the retreat of the locking slider 6, thereby preventing the tool from being put in;

[0064] If the positioning groove of the tool is aligned with the locking slide block 6, then when the tool reaches the tool entrance of the two bayonet holes 21, there will still be a distance between the end face of the locking slide block 6 and the bottom of the positioning groove. At this time, the tool is continued to be put in. When the end face of the locking slide block 6 fits with the bottom of the positioning groove, the center of the tool has passed the tool entrance of the bayonet hole 21, that is, the opening of the knife claw 2 is no longer at the maximum angle, then at this time, Figure 7 As shown, the first inclined surface 52 and the second inclined surface 24 will separate, so that the middle rotating block 5 can rotate again, and the locking slide block 6 can retreat normally, so that the tool can be smoothly inserted.

[0065] The above structure can physically block the entry of the tool when the tool positioning groove fails to properly align with the locking slider 6 through the design of two inclined surfaces, thereby improving the positioning accuracy of the tool placement and eliminating the possibility of misplacement of the tool. This design also ensures that when the knife claw 2 is in a fully opened state, the fit between the inclined surfaces can provide additional mechanical support to prevent the knife claw 2 from being over-opened or accidentally moving when subjected to external force.

[0066] In the self-locking state of the knife claw assembly, in order to further prevent the self-locking from being accidentally released during the rotation of the turntable, it is necessary to prevent the locking slider 6 from accidentally moving and ensure that the protrusion 51 is always in contact with the locking section 62. Two protective structure forms are designed for this knife claw assembly:

[0067] The first form of protection, such as Figure 6 , 9 As shown in FIGS. 12 and 15, a locking device 64 is provided on the side of the locking slider 6 attached to the support seat 1. The locking device 64 is composed of a locking spring 64a and a locking block 64b. The locking block 64b is installed in the accommodation space opened by the locking slider 6 and is rotatably connected to the locking slider 6. The locking spring 64a is compressed between the locking slider 6 and the locking block 64b. When the protrusion 51 contacts the locking section 62, the locking block 64b is ejected by the locking spring 64a and is stuck on the side of the support seat 1 away from the tool, as shown in FIG. Fig.12 As shown. The function of this structure is to ensure that the locking slider 6 can be fixed in a fixed position after the locking is completed, ensuring the stability of the locking, thereby enhancing the stability and safety of the entire device. When unlocking later, the unlocking push rod 8 only needs to push the locking slider 6 to return to the position shown in FIG. Fig. 9 To unlock, press the key to the position shown in the figure.

[0068] The second protection form is to make the locking guide block 7 surround the tool magazine turntable, and only set the inclined surface at the tool removal position. The locking guide block 7 surrounding the entire tool magazine turntable ensures that the locking slide 6 will not move in the tool removal direction when unlocking is not required, so that the entire device remains in a locked state, avoiding the risk of tool falling, and enhancing the stability and safety of the entire device.

[0069] Preferably, a spring receiving groove 53 is provided on the side of the middle rotating block 5 opposite to the knife claw 2, and a spring supporting groove 54 is provided in the spring receiving groove 53. The spring supporting groove 54 is a waist hole structure extending along the direction of the tool entering and exiting, and one end of the second spring 4 extends into the spring supporting groove 54. The reasonable design of the spring installing groove 23 and the spring receiving groove 53 not only provides a larger space to accommodate the second spring 4, but also can ensure the safe fixing of the spring and the stability of operation. Figure 7 and Fig.10 As shown, after the middle rotating block 5 rotates, the alignment relationship between the middle rotating block 5 and the position where the second spring 4 is installed on the knife claw 2 changes. Therefore, it is necessary to provide a sliding space for one end of the second spring 4 through the spring support groove 54 of the waist hole structure to prevent the second spring 4 from twisting too much during the rotation of the middle rotating block 5 and the knife claw 2 and causing damage.

[0070] like Figure 2 As shown, the guide column 61 and the locking guide block 7 are both detachable fixed structures. Since the sliding of the guide column 61 on the locking guide block 7 will produce friction and wear, the replaceable guide column 61 and the locking guide block 7 do not require large-scale disassembly of the entire device, making the maintenance process simpler and faster.

[0071] The support base 1 has a limit block 11 for inserting the locking slider 6 and a groove 12 for limiting the moving direction. The limit block 11 and the groove 12 can ensure that the locking slider 6 is limited in the moving range during use, preventing it from accidentally falling off or shifting, thereby improving the safety of the entire device. Moreover, the limit block 11 of the locking slider 6 and the groove 12 for limiting the moving direction of the locking slider 6 are in the correct position during the installation process, which provides convenience for the installation of the device.

[0072] In the embodiment of the present invention, the unlocking push rod 8 is preferably a pneumatic push rod. The pneumatic push rod can be driven by air pressure to achieve automatic operation, which greatly simplifies the manual operation process. In addition, the pneumatic push rod has a fast response speed and can quickly complete the unlocking operation, thereby improving the working efficiency of the device. Compared with manual operation, the pneumatic push rod can complete the action in a very short time, which is suitable for application scenarios that require quick response.

[0073] According to a second aspect of the present invention, a method for using a small-sized unpowered self-locking knife claw assembly device is also provided. Using the small-sized unpowered self-locking knife claw assembly device, the method comprises the following steps:

[0074] S10: When the tool enters, the tool pushes the locking slider 6 to move in the direction of tool entry, the unlocking section 63 drives the middle rotating block 5 to deviate in the direction of the knife claw 2 and compresses the second spring 4, and the guide column 61 moves to above the lowest point of the locking guide block;

[0075] S20: When the cutter disc rotates to change the cutter, the locking guide block 7 drives the guide column 61 to move in the direction of inserting the cutter and continues to drive the locking slide block 6 to move in the direction of inserting the cutter, so that the locking section 62 contacts the middle rotating block 5. At this time, the middle rotating block 5 and the locking slide block 6 completely block the movement space of the cutter claw 2 in the direction of opening.

[0076] S30: When taking out the knife, the unlocking push rod 8 pushes the locking slider 6 in the direction of taking out the knife, so that the protrusion 51 contacts the unlocking section 62, so that the knife claw 2 can move and the knife can be taken out.

[0077] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A small-sized unpowered self-locking claw assembly device, characterized in that: It includes a support seat, two knife claws, a first spring, two second springs, two middle rotating blocks, a locking slide block, a locking guide block and an unlocking push rod, wherein: The support base is used to provide installation space; The two knife claws are symmetrically arranged on both sides of the support base; each of the knife claws is rotatably connected to the support base; one end of each knife claw is provided with a bayonet for clamping a knife, and the other end is provided with a spring positioning column; the opposite sides of the two knife claws are provided with a spring mounting groove; The first spring is sleeved on the spring positioning column and compressed between the two knife claws; Two second springs are respectively installed in the spring installation grooves on the two knife claws, and are respectively compressed between the two middle rotating blocks and the knife claws; Two middle rotating blocks are symmetrically arranged on both sides of the support seat; one end of each middle rotating block close to the tool is rotatably connected to the support seat; and the other end has a protrusion that fits the side of the locking slider; The locking slider slides along the tool entry and exit direction; the locking slider has a guide column at the end of the tool entry direction; the locking slider is provided with a locking section and an unlocking section, the two sides of the locking section are planes extending along the tool entry and exit direction, and the distance between the two sides of the unlocking section gradually narrows along the tool insertion direction; A locking guide block is independently fixed; an inclined surface is arranged at one end of the locking guide block facing the support seat; An unlocking push rod, used to push the locking slider to move so as to unlock the knife claw assembly; The middle rotating block and the knife claw are provided with a first inclined surface and a second inclined surface respectively. When the knife claw is opened to a maximum angle, the first inclined surface fits with the second inclined surface and enables the protrusion to press against the unlocking section of the locking slider.

2. The small-sized non-powered self-locking knife claw assembly device according to claim 1 is characterized in that: A locking device is provided on a side of the locking slider attached to the support seat, the locking device comprising a locking spring and a locking block, the locking block being installed inside the accommodating space opened by the locking slider and being rotatably connected to the locking slider, the locking spring being compressed between the locking slider and the locking block; when the protrusion contacts the locking section, the locking block is ejected by the locking spring and stuck on the side of the support seat away from the tool.

3. The small-sized non-powered self-locking knife claw assembly device according to claim 1 is characterized in that: The locking guide block surrounds the tool magazine turntable.

4. The small-sized non-powered self-locking knife claw assembly device according to claim 1 is characterized in that: A spring receiving groove opposite to the spring installation groove is arranged on one side of the middle rotating block opposite to the knife claw, a spring supporting groove is arranged in the spring receiving groove, and the spring supporting groove is a waist hole structure extending along the entry and exit direction of the tool, and one end of the second spring extends into the spring supporting groove.

5. The small-sized non-powered self-locking knife claw assembly device according to claim 1, characterized in that: The guide column and the locking guide block are both detachable fixed structures.

6. The small-sized non-powered self-locking knife claw assembly device according to claim 1, characterized in that: The support seat is provided with a limit block for inserting the locking slider and a groove for limiting the moving direction of the locking slider.

7. The small-sized non-powered self-locking knife claw assembly device according to claim 6, characterized in that: An oil groove is formed on the contact surface between the locking slide block and the protrusion.

8. The small-sized non-powered self-locking knife claw assembly device according to claim 6, characterized in that: The unlocking push rod is a pneumatic push rod.

9. A method for using a small-sized non-powered self-locking knife claw assembly device, characterized in that: Using the small-sized non-powered self-locking knife claw assembly device as claimed in any one of claims 1 to 8 comprises the following steps: S10: When the tool enters, the tool pushes the locking slider to move in the direction of tool entry, the unlocking section drives the middle rotating block to deviate toward the knife claw and compress the second spring, and the guide column moves to above the lowest point of the locking guide block; S20: When the cutter disc rotates to change the cutter, the locking guide block drives the guide column to move along the direction of inserting the cutter and continues to drive the locking slider to move in the direction of inserting the cutter, so that the locking section contacts the middle rotating block. At this time, the middle rotating block and the locking slider completely block the movement space of the cutter claw in the direction of opening. S30: When taking out the knife, the unlocking push rod pushes the locking slider in the direction of taking out the knife, so that the protrusion contacts the unlocking section, so that the knife claw can move and the knife can be taken out.

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