An inside expanding tool holder

Abstract

The application discloses an inner expansion type cutter clamping device and relates to the technical field of cutter clamping, aiming to solve the technical problem that current devices adopt a single fixing mechanism, have poor versatility and are difficult to meet the fixing needs of different specifications and types of cutters, and comprises a spreading assembly. The application is characterized in that the spreading assembly, the deformed inner expansion assembly and the plug positioning structure are designed, the deformed inner expansion assembly and the spreading assembly are matched through a slope to realize efficient expansion and contraction conversion, the plug positioning structure is integrated in the spreading assembly, the limiting locking is completed through buckling, and the buckling positions other types of cutters. The application integrates the expansion and contraction and the positioning locking functions, forms a double fixing mechanism of radial expansion and circumferential buckling, can switch the fixing structure according to the specific type of the cutter, adapts to the fixing needs of different specifications of cutters, and guarantees the reliability of cutter fixing.

Description

Technical Field

[0001] This invention relates to the field of tool clamping technology, and more specifically, to an internally expanding tool clamping device. Background Technology

[0002] In modern manufacturing, the precision, efficiency, and reliability of machining directly determine product quality and production efficiency. As a core component connecting the machine tool spindle and the cutting tool, the tool clamping device plays a decisive role in machining quality. The internal expansion tool clamping device, based on the core principle of "internal tensioning," achieves a wrapping fixation of the tool through the radial expansion of internal components. Compared to traditional clamping methods, it offers advantages such as high clamping precision, strong stability, and minimal damage to the tool.

[0003] However, existing devices often employ only a simple radial tensioning fixing mechanism, and the fixing structure can only accommodate a single type of tool with internal expansion fixing. When it is necessary to fix tools with slots, other equipment must be used for clamping, resulting in poor versatility and difficulty in meeting the diverse fixing needs of tools of different specifications and types. In view of this, we propose an internal expansion tool clamping device. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide an internal expansion tool clamping device to solve the technical problem that the current device adopts a single fixing mechanism, has poor versatility, and is difficult to meet the fixing needs of tools of different specifications and types.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an internal expansion tool clamping device, comprising a spreading component, a deformable internal expansion component, and an insert block positioning structure; The deformable inner expansion component is slidably arranged on the outside of the expansion component. When the deformable inner expansion component moves axially on the expansion component, the expansion sleeve end of the deformable inner expansion component cooperates with the inclined surface of the expansion component to expand and contract. The insertion block positioning structure is arranged on the expansion assembly. The insertion block positioning structure has a retracted state and an extended state. When the insertion block positioning structure is in the retracted state, the positioning component of the insertion block positioning structure retracts into the expansion assembly. When the insertion block positioning structure is in the extended state, the expansion assembly rotates to drive the slider of the insertion block positioning structure to rotate, and the positioning component of the insertion block positioning structure extends out of the expansion assembly to form a tool latch.

[0006] Preferably, the spreading component has an initial state and a deformed state. When the spreading component is in the initial state, the front end of the spreading component contracts into a conical structure. When the spreading component is in the deformed state, the front end of the spreading component opens into a trumpet-shaped structure. The deformable internal expansion component has a first open state and a second open state. When the deformable internal expansion component is in the first open state, it has a columnar structure. When the deformable internal expansion component is in the second open state, it has a trumpet-shaped structure. When the expansion component is in the initial state and moves along the axial direction, the expansion component uses a conical structure to make the deformable internal expansion component in the first open state. When the expansion component is in the deformed state, the expansion component uses a trumpet-shaped structure to make the deformable internal expansion component in the second open state.

[0007] Preferably, the spreading component includes a fixed base, a rear spreading member of the expanding sleeve, and a head spreading structure of the expanding sleeve; The rear end support of the expansion sleeve is movably connected to the front end of the fixed base, and the front end support structure of the expansion sleeve is located at the front end of the rear end support of the expansion sleeve. The rear end support of the expansion sleeve and the front end support structure of the expansion sleeve form a conical structure. The conical structure is used to drive the deformation internal expansion component to deform to the first expansion state.

[0008] Preferably, the expansion sleeve end spreading structure includes a mounting cylinder, a spreading plate, a connecting piece, a drive link, a drive rod, and a telescopic drive unit; The mounting cylinder is installed at the front end of the expansion sleeve rear end support member, and the mounting cylinder is a hollow cylindrical structure. Several expansion plates are equidistantly arranged in a ring on the side wall of the mounting cylinder. The middle parts of several expansion plates are movably connected to several connecting members, and the several connecting members are all installed on the inner wall of the mounting cylinder. Several driving rods are movably connected to one end of several expansion plates, and the other ends of several driving rods are equidistantly arranged in a ring on the head end of the driving rod. The driving rod is slidably connected to the expansion sleeve rear end support member. The telescopic driving unit is installed on the expansion sleeve rear end support member, and the output end of the telescopic driving unit is connected to the tail end of the driving rod. When the expansion assembly is in the initial state, the expansion plates are closed and flush with the side wall of the mounting cylinder. When the expansion assembly is in the deformed state, the drive linkages drive the expansion plates to protrude to the outside of the mounting cylinder. The mounting cylinder and the expansion plates form a trumpet-shaped structure. The trumpet-shaped structure is used to drive the deformation expansion assembly to deform to the second expansion state.

[0009] Preferably, the deformable inner expansion assembly includes an expansion sleeve structure, a connecting soft sleeve, and a longitudinal drive component; A plurality of expansion sleeve structures are arranged in an equidistant ring on the outside of the mounting cylinder. A plurality of connecting soft sleeves are connected between the plurality of expansion sleeve structures. A plurality of expansion sleeve structures are arranged in an equidistant ring at the head end of the longitudinal drive component, and the longitudinal drive component is slidably connected to the fixed seat. When the deformable inner expansion assembly is in the first expanded state, the plurality of expansion sleeve structures and the plurality of connecting soft sleeves form a columnar structure. The columnar structure is used for inner expansion to fix the tool with a cylindrical hole.

[0010] Preferably, the expansion sleeve structure includes an inner expansion end and a rotating end; A plurality of inner expansion ends are equidistantly and annularly connected to the head end of the longitudinal drive component. One end of each of the plurality of rotating ends is rotatably connected to the plurality of inner expansion ends, and an inclined surface is provided at the connection between the inner expansion ends and the rotating ends. The plurality of rotating ends rotate in a direction away from the mounting cylinder. When the deformable inner expansion assembly is in the second open state, the front ends of the plurality of rotating ends and the plurality of connecting soft sleeves form a trumpet-shaped structure. The trumpet-shaped structure is used for inner expansion to fix the tool with a trumpet-shaped hole.

[0011] Preferably, the expansion sleeve structure further includes a guide rod, a guide groove, and a return spring; Several guide rods are respectively installed on several rotating ends, several guide grooves are respectively opened on the inclined surfaces of several inner expansion ends, and several guide rods are respectively slidably connected in several guide grooves. Several guide rods and several guide grooves are connected by several return springs, and the guide rods are curved rod structures.

[0012] Preferably, the insertion block positioning structure includes a slider, a crank arm, a reciprocating connecting rod, a slide rod, and a positioning component; A plurality of sliders are slidably connected to the inner sides of a plurality of inner expansion ends. A plurality of curved arms are mounted on a plurality of sliders and slidably connected to the inner sides of a plurality of inner expansion ends. The two ends of each curved arm are movably connected to two reciprocating connecting rods. A plurality of reciprocating connecting rods are movably connected to a plurality of sliding rods. A plurality of sliding rods are slidably connected to a plurality of inner expansion ends. A plurality of positioning components are mounted at the ends of a plurality of sliding rods and movably connected to grooves opened on the surfaces of a plurality of inner expansion ends. When the insert positioning structure is in a retracted state, the plurality of positioning components retract into the grooves. When the insert positioning structure is in an extended state, the plurality of positioning components extend out of the grooves to form a protruding snap-fit ​​structure. The protruding snap-fit ​​structure is used to snap-fit ​​and fix the tool with a corresponding shaped groove.

[0013] Preferably, the rear end support member of the expansion sleeve is provided with several equidistant annular limiting grooves, and several sliders are respectively slidably connected in the several limiting grooves. The rear end support member of the expansion sleeve is connected to the output end of a rotary drive unit, and the rotary drive unit is mounted on a fixed base.

[0014] Preferably, the positioning component includes a first positioning block and a second positioning block; The first positioning blocks are all hexagonal columnar structures, and the second positioning blocks are all frustum-shaped structures. Each inner expansion end has a first positioning block and a second positioning block on its two sides.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the design of an expansion component, a deformable internal expansion component, and a positioning block structure, achieves efficient expansion and contraction switching between the deformable internal expansion component and the expansion component via inclined surface cooperation. The positioning block structure is integrated into the expansion component and achieves limiting and locking through a snap-fit ​​mechanism, enabling the snap-fit ​​positioning of other types of cutting tools. This invention integrates expansion, contraction, and positioning locking functions into one unit, forming a dual fixing mechanism of radial tension and circumferential snap-fit. The fixing structure can be switched according to the specific type of cutting tool, adapting to the fixing requirements of different specifications of cutting tools and ensuring the reliability of tool fixing.

[0016] 2. This invention utilizes the design of a spreading component and a deformable internal expansion component. The spreading component initially presents a conical structure, while its deformed state is a trumpet-shaped structure. The deformable internal expansion component presents a columnar structure in its first spreading state and a trumpet-shaped structure in its second spreading state. These two components are linked through structural adaptation. When the spreading component is in its initial conical structure and moves axially, it drives the deformable internal expansion component to switch to the first spreading columnar state, completing the adaptation and fixation of one type of tool. When the spreading component switches to the deformable trumpet-shaped structure, it drives the deformable internal expansion component to switch to the second spreading trumpet-shaped state through structural adaptation, achieving the adaptation and fixation of another type of tool. This invention, through the design of the spreading component and the deformable internal expansion component, achieves internal expansion fixation of different tools through structural adaptation in different states, adapting to the industrial application needs of fixing different specifications of tools in the fields of machining and automated equipment.

[0017] 3. This invention, through the design of the expanding component and the deformable inner expansion component, allows for the following: When the longitudinal driving component moves the deformable inner expansion component axially, and the expanding component is in its initial state, the tapered expansion sleeve's rear end expanding member and the retracting expanding plate push the inner expansion end of the expansion sleeve structure to retract synchronously, adapting to the inner expansion and fixation of cylindrical hole tools. When it is necessary to fix a trumpet-shaped hole tool, the expansion sleeve's head end expanding structure transforms into a trumpet-shaped deformed state, while the deformable inner expansion component fits against this trumpet-shaped structure. The six rotating ends and the front end of the connecting soft sleeve form a second trumpet-shaped expanding state, achieving full-fitting inner expansion and fixation of the trumpet-shaped hole tool. This invention, through the switching between tapered and trumpet-shaped forms of the expanding component and the graded adaptation of the cylindrical and trumpet-shaped forms of the deformable inner expansion component, can achieve precise fixation of tools with different hole shapes without complex adjustments. The guide rod and crank design of the expansion sleeve structure, in conjunction with the return spring, ensures a smooth and controllable deformation process and precise reset.

[0018] 4. This invention utilizes a design for a positioning block structure. When the positioning block is retracted, the positioning component retracts into the groove without interfering with the internal expansion action. When extended, it presents a protruding snap-fit ​​structure that precisely snaps onto the tool with a corresponding groove shape, thus achieving a dual locking effect of internal expansion fixation and snap-fit ​​positioning. This invention, through its positioning block structure design, overcomes the shortcomings of traditional internal expansion structures, which can only adapt to a single hole shape and lack sufficient fixing stability. It is suitable for fixing various sizes of tools, both with and without grooves.

[0019] 5. This invention utilizes a dual-form design for its positioning components. The first positioning block is a hexagonal columnar structure, and the second positioning block is a frustum-shaped structure. During retraction, both retract into the inner expansion groove without interfering with the expansion action. During extension, they can be fitted and engaged according to the shape of the tool's groove. Existing snap-fit ​​tools often have hexagonal or frustum-shaped grooves. Hexagonal grooves have a large contact area, high circumferential positioning accuracy, and strong torque transmission capability, making them suitable for tools that withstand large torques. Frustum-shaped grooves offer high positioning accuracy, good self-centering effect, and superior torque transmission capability compared to cylindrical pins. The hexagonal and frustum-shaped positioning blocks correspond to these two types of grooves respectively. This invention deeply integrates graded inner expansion adaptation, precise snap-fit ​​positioning, and dual-form positioning adaptation. It not only solves the shortcomings of traditional inner expansion structures, such as single adaptation and fixed positioning forms, but also improves the fixing reliability under high-speed cutting and vibration conditions through a dual fixing mechanism. It can adapt to cylindrical / flared holes, hexagonal / frustum-shaped grooves, and various specifications of tools without grooves. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the expansion component of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the deformable internal expansion component of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the expansion sleeve rear end support and the expansion sleeve head end support structure of the present invention.

[0024] Figure 5 This is a cross-sectional view of the expansion sleeve rear end support member and the expansion sleeve head end support structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the expansion sleeve end spreading structure of the present invention.

[0026] Figure 7 This is a schematic diagram of a single expansion sleeve structure of the present invention.

[0027] Figure 8 This is a cross-sectional view of one side of a single expansion sleeve structure of the present invention.

[0028] Figure 9 This is a cross-sectional view of the other side of a single expansion sleeve structure of the present invention.

[0029] Figure 10 This is a cross-sectional view of the tool adapted to the second open state of the present invention.

[0030] Figure 11 This is a cross-sectional view of the tool adapted to the second open state of the present invention when the first positioning block is extended.

[0031] Figure 12 This is a cross-sectional view of the tool adapted to the second open state of the present invention when the second positioning block is extended.

[0032] Explanation of the labels in the diagram: 1. Spreading component; 2. Deformable internal expansion component; 3. Insert block positioning structure; 101. Fixed base; 102. Rear end support component of the expansion sleeve; 103. Head end support structure of the expansion sleeve; 1021. Limiting slide; 1022. Rotary drive unit; 1031. Mounting cylinder; 1032. Spreading plate; 1033. Connecting piece; 1034. Drive linkage; 1035. Drive rod; 1036. Telescopic drive unit; 201. Expanding sleeve structure; 202. Connecting flexible sleeve; 203. Longitudinal drive component; 2011, Inner expansion end; 2012, Rotating end; 2013, Guide rod; 2014, Guide groove; 2015, Return spring; 301. Slider; 302. Crank arm; 303. Reciprocating connecting rod; 304. Slide rod; 305. Positioning component; 3051, First positioning block; 3052, Second positioning block. Detailed Implementation

[0033] Example 1, as Figures 1 to 12As shown, the present invention relates to an internally expanding tool clamping device, comprising a spreading assembly 1, a deformable internally expanding assembly 2, and an insert positioning structure 3; the deformable internally expanding assembly 2 is slidably arranged on the outside of the spreading assembly 1, and when the deformable internally expanding assembly 2 moves axially on the spreading assembly 1, the expanding sleeve end of the deformable internally expanding assembly 2 cooperates with the inclined surface of the spreading assembly 1 to expand and contract; the insert positioning structure 3 is arranged on the spreading assembly 1, and the insert positioning structure 3 has a contracted state and an extended state. When the insert positioning structure 3 is in the contracted state, the positioning component 305 of the insert positioning structure 3 retracts into the spreading assembly 1. When the insert positioning structure 3 is in the extended state, the spreading assembly 1 rotates to drive the slider 301 of the insert positioning structure 3 to rotate, and the positioning component 305 of the insert positioning structure 3 extends out of the spreading assembly 1 to form a tool clamping component.

[0034] This invention utilizes the design of an expansion component 1, a deformable inner expansion component 2, and a positioning block structure 3. The deformable inner expansion component 2 is slidably assembled on the outside of the expansion component 1. The two components achieve efficient expansion and contraction conversion through precise inclined surface cooperation. The axial driving force can be cleverly converted into radial expansion force at the expansion sleeve end, allowing the expansion sleeve end to tightly fit against the inner wall of the tool mounting hole to complete the initial radial fixation. At the same time, the high-precision characteristics of the inclined surface guide ensure uniform force distribution during expansion, avoiding damage to the tool or component caused by local stress concentration. The positioning block structure 3 is integrated into the expansion component 1 and achieves flexible switching between contraction and extension states through rotational linkage. During contraction, the positioning component 305 retracts into the component without interfering with the expansion action. After extension, it forms a snap-fit ​​component adapted to the tool, achieving limit locking through snap-fit, and realizing snap-fit ​​positioning of other types of tools. This invention integrates the expansion, contraction, and positioning locking functions into one unit, forming a dual fixing mechanism of radial tension and circumferential snap-fit. The fixing structure can be switched according to the specific type of tool, adapting to the fixing requirements of different specifications of tools and ensuring the reliability of tool fixing.

[0035] Specifically, such as Figures 1 to 8 As shown, the expansion component 1 of the present invention has an initial state and a deformed state. When the expansion component 1 is in the initial state, the front end of the expansion component 1 contracts into a conical structure. When the expansion component 1 is in the deformed state, the front end of the expansion component 1 opens into a trumpet structure. The deformable inner expansion component 2 has a first expansion state and a second expansion state. When the deformable inner expansion component 2 is in the first expansion state, it has a columnar structure. When the deformable inner expansion component 2 is in the second expansion state, it has a trumpet structure. When the expansion component 1 is in the initial state and moves along the axial direction, the expansion component 1 causes the deformable inner expansion component 2 to be in the first expansion state through the conical structure. When the expansion component 1 is in the deformed state, the expansion component 1 causes the deformable inner expansion component 2 to be in the second expansion state through the trumpet structure.

[0036] This invention utilizes the design of an expanding component 1 and a deformable internal expansion component 2. The expanding component 1 has two states: an initial state and a deformed state. In the initial state, its front end contracts into a conical structure, while in the deformed state, its front end expands into a trumpet shape. The deformable internal expansion component 2 has two corresponding expanding states: a first expanding state with a columnar structure and a second expanding state with a trumpet shape. The two components achieve precise state linkage through structural adaptation. When the expanding component 1 is in the initial conical structure and moves axially, it can drive the deformable internal expansion component 2 to switch to the first expanding columnar state, completing the adaptation and fixation of one type of tool. When the expanding component 1 switches to the deformed trumpet shape, the structural adaptation drives the deformable internal expansion component 2 to switch to the second expanding trumpet shape, achieving the adaptation and fixation of another type of tool. This invention, through the design of the expanding component 1 and the deformable internal expansion component 2, achieves internal expansion fixation of different tools through structural adaptation in different states, adapting to the industrial application needs of fixing different specifications of tools in the fields of machining and automated equipment.

[0037] It is worth noting that, such as Figures 4 to 8 As shown, the expansion assembly 1 of the present invention includes a fixed base 101, a rear expansion member 102 of the expansion sleeve, and a head expansion structure 103 of the expansion sleeve; the rear expansion member 102 of the expansion sleeve is movably connected to the front end of the fixed base 101, and the head expansion structure 103 of the expansion sleeve is located at the front end of the rear expansion member 102 of the expansion sleeve. The rear expansion member 102 of the expansion sleeve and the head expansion structure 103 of the expansion sleeve form a conical structure. The conical structure is used to drive the deformation internal expansion assembly 2 to deform to the first expansion state.

[0038] The expansion sleeve head end spreading structure 103 includes a mounting cylinder 1031, spreading plates 1032, connecting members 1033, drive connecting rods 1034, drive rods 1035, and a telescopic drive unit 1036. The mounting cylinder 1031 is installed at the front end of the expansion sleeve rear end spreading member 102, and the mounting cylinder 1031 is a hollow cylindrical structure. Six spreading plates 1032 are equidistantly arranged in a ring on the side wall of the mounting cylinder 1031. The middle parts of the six spreading plates 1032 are movably connected to six connecting members 1033, and the six connecting members 1033 are all installed on the inner wall of the mounting cylinder 1031. Six drive connecting rods 1034 are movably connected to one end of the six spreading plates 1032, and the other ends of the six drive connecting rods 1034 are respectively connected to one end of the six spreading plates 1032. An equidistant ring is movablely connected to the head end of the drive rod 1035. The drive rod 1035 is slidably connected to the rear end support member 102 of the expansion sleeve. The telescopic drive unit 1036 is installed on the rear end support member 102 of the expansion sleeve, and the output end of the telescopic drive unit 1036 is connected to the tail end of the drive rod 1035. When the expansion assembly 1 is in the initial state, the six support plates 1032 are closed and flush with the side wall of the mounting cylinder 1031. When the expansion assembly 1 is in the deformed state, the six drive connecting rods 1034 drive the six support plates 1032 to protrude to the outside of the mounting cylinder 1031. The mounting cylinder 1031 and the six support plates 1032 form a trumpet-shaped structure. The trumpet-shaped structure is used to drive the deformation inner expansion assembly 2 to deform to the second expansion state.

[0039] The deformable internal expansion assembly 2 includes an expansion sleeve structure 201, a connecting soft sleeve 202, and a longitudinal drive component 203. Six expansion sleeve structures 201 are arranged equidistantly in a ring on the outside of the mounting cylinder 1031. Six connecting soft sleeves 202 are connected between the six expansion sleeve structures 201. The six expansion sleeve structures 201 are arranged equidistantly in a ring at the head end of the longitudinal drive component 203, and the longitudinal drive component 203 is slidably connected to the fixed seat 101. When the deformable internal expansion assembly 2 is in the first expanded state, the six expansion sleeve structures 201 and the six connecting soft sleeves 202 form a columnar structure. The columnar structure is used for internal expansion to fix the tool with a cylindrical hole.

[0040] The expansion sleeve structure 201 includes an inner expansion end 2011 and a rotating end 2012; six inner expansion ends 2011 are equidistantly and annularly connected to the head end of the longitudinal drive component 203, and one end of each of the six rotating ends 2012 is rotatably connected to the six inner expansion ends 2011. An inclined surface is provided at the connection between the inner expansion ends 2011 and the rotating ends 2012. The six rotating ends 2012 rotate in a direction away from the mounting cylinder 1031. When the deformable inner expansion assembly 2 is in the second open state, the front ends of the six rotating ends 2012 and the six connecting soft sleeves 202 form a trumpet-shaped structure. The trumpet-shaped structure is used for the inner expansion to fix the tool with the trumpet-shaped hole.

[0041] The expansion sleeve structure 201 also includes guide rods 2013, guide grooves 2014, and return springs 2015; six guide rods 2013 are respectively installed on six rotating ends 2012, six guide grooves 2014 are respectively opened on the inclined surfaces of six inner expansion ends 2011, and the six guide rods 2013 are slidably connected in the six guide grooves 2014. The six guide rods 2013 and the six guide grooves 2014 are connected by six return springs 2015. The guide rods 2013 are curved rod structures.

[0042] This invention integrates the precise cooperation of the expansion component 1 and the deformable internal expansion component 2 through the design of the expansion component 1 and the deformable internal expansion component 2, to achieve adaptive internal expansion and fixation for tools with different hole shapes. The expansion component 1 is based on the fixed base 101, and the expansion sleeve rear end expansion member 102 and the expansion sleeve head end expansion structure 103 in the initial state form a conical structure. The deformable internal expansion component 2 forms a deformable internal expansion system through six equidistantly arranged ring-shaped expansion sleeve structures 201, connecting soft sleeves 202 and longitudinal drive components 203. The expansion sleeve structure 201 has a built-in rotating end 2012, guide rod 2013, inclined surface guide groove 2014 and return spring 2015, to build a stable deformation-reset mechanism. When the longitudinal drive component 203 drives the deformable inner expansion component 2 to move axially, and the expansion component 1 is in its initial state, the tapered expansion sleeve rear end expansion member 102 and the retracted expansion plate 1032 push the inner expansion end 2011 of the expansion sleeve structure 201 to retract synchronously. The six expansion sleeve structures 201 and the connecting soft sleeve 202 form a columnar first expansion state, which accurately adapts to the inner expansion and fixation of the cylindrical hole tool. When it is necessary to fix the trumpet-shaped hole tool, the telescopic drive unit 1036 drives the drive rod 1035 to drive the six drive connecting rods 1034. The linkage causes the expansion plate 1032 to rotate along the connector 1033 and protrude outward from the mounting cylinder 1031. The expansion head end expansion structure 103 deforms into a trumpet-shaped deformed state. At the same time, the deformed inner expansion component 2 fits into this trumpet-shaped structure. The rotating end 2012 rotates outward along the guide groove 2014 under the dual action of the inclined surface and the expansion plate 1032. The return spring 2015 is stretched, and the six rotating ends 2012 and the front end of the connecting soft sleeve 202 form a second trumpet-shaped expansion state, realizing the full fit and inner expansion fixation of the trumpet-shaped hole tool. This invention achieves precise fixation of tools with different hole shapes without complex adjustment by switching between the conical and trumpet-shaped forms of the expansion component 1 and the columnar and trumpet-shaped stepwise adaptation of the deformed inner expansion component 2. The guide rod 2013 of the expansion sleeve structure 201 is designed with a curved rod and cooperates with the return spring 2015 to ensure that the deformation process is stable and controllable and the reset is accurate.

[0043] Furthermore, such as Figures 7 to 9As shown, the insertion block positioning structure 3 of the present invention includes a slider 301, a crank arm 302, a reciprocating connecting rod 303, a slide rod 304, and a positioning component 305; six sliders 301 are slidably connected to the inner sides of six inner expansion ends 2011, six crank arms 302 are respectively mounted on the six sliders 301, and the six crank arms 302 are slidably connected to the inner sides of the six inner expansion ends 2011, the two ends of the crank arms 302 are respectively movably connected to two reciprocating connecting rods 303, and twelve reciprocating connecting rods 303 are respectively movably connected to twelve slide rods 304, and twelve... The slide rods 304 are slidably connected to the six inner expansion ends 2011 respectively. The twelve positioning components 305 are respectively installed at the ends of the twelve slide rods 304, and the twelve positioning components 305 are movably connected to the grooves opened on the surface of the six inner expansion ends 2011. When the insert block positioning structure 3 is in the retracted state, the twelve positioning components 305 are retracted into the grooves. When the insert block positioning structure 3 is in the extended state, the twelve positioning components 305 protrude from the grooves to form a protruding snap-fit ​​structure. The protruding snap-fit ​​structure is used to snap-fit ​​and fix the tool with the corresponding groove shape.

[0044] The expansion sleeve rear end support member 102 has six equidistant annularly arranged limiting grooves 1021. The six sliders 301 are slidably connected in the six limiting grooves 1021 respectively. The expansion sleeve rear end support member 102 is connected to the output end of the rotary drive unit 1022, and the rotary drive unit 1022 is mounted on the fixed base 101.

[0045] This invention achieves precise fixation of tools with different hole shapes and grooves through the design of the insert positioning structure 3. The insert positioning structure 3 uses six sliders 301 as the transmission starting point. The sliders 301 are slidably connected in the limiting groove 1021 of the expansion sleeve rear end support 102. The expansion sleeve rear end support 102 is driven to rotate by the rotary drive unit 1022. Through the limiting groove 1021, the sliders 301 are driven to rotate along the inner side of the inner expansion end 2011, which in turn drives the crank arm 302 to move synchronously. The two ends of the crank arm 302 drive the connected reciprocating connecting rod 303 to rotate. The reciprocating connecting rod 303 pulls the slide rod 304 to slide, and finally realizes the extension and retraction switching of the twelve positioning components 305 in the groove of the inner expansion end 2011. In the retracted state, the positioning components 305 are retracted into the groove and do not interfere with the inner expansion action. In the extended state, they are in the form of a protruding buckle structure, which precisely buckles the tool with the corresponding groove shape, and also forms a double locking of inner expansion fixation and buckle positioning.

[0046] This invention solves the shortcomings of traditional internal expansion structures, which can only adapt to a single hole shape and have insufficient fixing stability, through the design of the insertion block positioning structure 3. It is suitable for fixing various specifications of tools with and without grooves.

[0047] Furthermore, such as Figures 8 to 9As shown, the present invention relates to a positioning component 305 including a first positioning block 3051 and a second positioning block 3052; all six first positioning blocks 3051 are hexagonal columnar structures, and all six second positioning blocks 3052 are frustum-shaped structures, with a first positioning block 3051 and a second positioning block 3052 respectively provided on both sides of each inner expansion end 2011.

[0048] This invention utilizes the design of the positioning component 305, which employs a dual-form design. Six first positioning blocks 3051 are hexagonal columnar structures, and six second positioning blocks 3052 are frustum-shaped structures. Each inner expansion end 2011 is symmetrically arranged on both sides. During contraction, they retract into the grooves of the inner expansion end 2011 without interfering with the expansion action. During extension, they can be adapted to fit the shape of the tool's groove. Existing snap-fit ​​tools often have hexagonal or frustum-shaped grooves. Hexagonal grooves have a large contact area, high circumferential positioning accuracy, and strong torque transmission capability, making them suitable for tools that withstand large torques. Frustum-shaped grooves have high positioning accuracy, good self-centering effect, and superior torque transmission capability compared to cylindrical pins. By using hexagonal and frustum-shaped positioning blocks corresponding to the two types of grooves respectively, and with symmetrical arrangement on both sides, the uniformity of the snap-fit ​​force is further improved, enhancing the anti-rotation and anti-shifting effects. The dual-mode positioning block significantly expands the tool compatibility range. The longitudinal drive component 203 and the rotary drive unit 1022 work together to achieve full automation of the "internal expansion mode switching - positioning block extension and engagement" process, eliminating the need for additional independent drives and simplifying the operation process. This invention deeply integrates graded internal expansion adaptation, precise snap-fit ​​positioning, and dual-mode positioning adaptation, solving the shortcomings of traditional internal expansion structures in terms of single adaptation and fixed positioning form. It also improves the fixing reliability under high-speed cutting and vibration conditions through a dual fixing mechanism. It can adapt to various specifications of tools such as cylindrical / trumpet-shaped holes, hexagonal / frustum-shaped grooves, and grooveless tools, making it perfectly suitable for industrial tool fixing needs in fields such as machining, rapid tool change in automated production lines, and multi-specification tooling positioning.

[0049] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. An internally expanding tool clamping device, characterized in that, It includes a spreading component (1), a deformable inner expansion component (2), and an insert positioning structure (3); The deformable inner expansion component (2) is slidably arranged on the outside of the expansion component (1). When the deformable inner expansion component (2) moves axially on the expansion component (1), the expansion sleeve end of the deformable inner expansion component (2) cooperates with the inclined surface of the expansion component (1) to expand and contract. The deformable internal expansion assembly (2) includes an expansion sleeve structure (201), a connecting soft sleeve (202), and a longitudinal drive component (203); a plurality of expansion sleeve structures (201) are arranged equidistantly in a ring on the outside of the mounting cylinder (1031) of the expansion assembly (1), a plurality of connecting soft sleeves (202) are connected between a plurality of expansion sleeve structures (201), a plurality of expansion sleeve structures (201) are arranged equidistantly in a ring at the head end of the longitudinal drive component (203), and the longitudinal drive component (203) is slidably connected to the fixing seat (101) of the expansion assembly (1). When the deformable internal expansion assembly (2) is in the first expansion state, a plurality of expansion sleeve structures (201) and a plurality of connecting soft sleeves (202) form a columnar structure, and the columnar structure is used for internal expansion to fix the tool with a cylindrical hole; The expansion sleeve structure (201) includes an inner expansion end (2011) and a rotating end (2012); a plurality of inner expansion ends (2011) are equidistantly and annularly connected to the head end of the longitudinal drive component (203); one end of a plurality of rotating ends (2012) is rotatably connected to a plurality of inner expansion ends (2011); and an inclined surface is provided at the connection between the inner expansion end (2011) and the rotating end (2012); the plurality of rotating ends (2012) rotate in a direction away from the mounting cylinder (1031); when the deformable inner expansion assembly (2) is in the second open state, the front ends of the plurality of rotating ends (2012) and the plurality of connecting soft sleeves (202) are in a trumpet-shaped structure; the trumpet-shaped structure is used for inner expansion to fix the tool with a trumpet-shaped hole; The insertion block positioning structure (3) is arranged on the expansion assembly (1). The insertion block positioning structure (3) has a retracted state and an extended state. When the insertion block positioning structure (3) is in the retracted state, the positioning component (305) of the insertion block positioning structure (3) is retracted into the expansion assembly (1). When the insertion block positioning structure (3) is in the extended state, the expansion assembly (1) rotates to drive the slider (301) of the insertion block positioning structure (3) to rotate. The positioning component (305) of the insertion block positioning structure (3) extends out of the expansion assembly (1) to form a tool fastener.

2. The internal expansion tool clamping device according to claim 1, characterized in that, The spreading component (1) has an initial state and a deformed state. When the spreading component (1) is in the initial state, the front end of the spreading component (1) contracts into a conical structure. When the spreading component (1) is in the deformed state, the front end of the spreading component (1) opens into a trumpet-shaped structure. The deformable inner expansion component (2) has a first open state and a second open state. When the deformable inner expansion component (2) is in the first open state, it has a columnar structure. When the deformable inner expansion component (2) is in the second open state, it has a trumpet-shaped structure. When the opening component (1) is in the initial state and moves along the axial direction, the opening component (1) makes the deformable inner expansion component (2) in the first open state through the conical structure. When the opening component (1) is in the deformed state, the opening component (1) makes the deformable inner expansion component (2) in the second open state through the trumpet-shaped structure.

3. The internal expansion tool clamping device according to claim 2, characterized in that, The expansion assembly (1) includes a fixed base (101), a rear expansion member (102) of the expansion sleeve, and a head expansion structure (103) of the expansion sleeve. The rear end support member (102) of the expansion sleeve is movably connected to the front end of the fixed base (101). The head end support structure (103) of the expansion sleeve is located at the front end of the rear end support member (102). The rear end support member (102) and the head end support structure (103) of the expansion sleeve form a conical structure. The conical structure is used to drive the deformation inner expansion component (2) to deform to the first expansion state.

4. The internally expanding tool clamping device according to claim 3, characterized in that, The expansion sleeve end opening structure (103) includes an installation cylinder (1031), an opening plate (1032), a connector (1033), a drive link (1034), a drive rod (1035), and a telescopic drive unit (1036). The mounting cylinder (1031) is installed at the front end of the expansion sleeve rear end support member (102), and the mounting cylinder (1031) is a hollow cylindrical structure. A plurality of expansion plates (1032) are equidistantly arranged in a ring on the side wall of the mounting cylinder (1031). The middle portions of the expansion plates (1032) are movably connected to a plurality of connecting members (1033), and the connecting members (1033) are all installed on the inner wall of the mounting cylinder (1031). A plurality of driving connecting rods (103... 4) The other ends of the plurality of drive rods (1034) are movably connected to one end of the plurality of expansion plates (1032), and are movably connected to the head end of the drive rod (1035) at equal intervals in a ring. The drive rod (1035) is slidably connected to the rear end expansion member (102) of the expansion sleeve. The telescopic drive unit (1036) is installed on the rear end expansion member (102) of the expansion sleeve, and the output end of the telescopic drive unit (1036) is connected to the tail end of the drive rod (1035). When the expansion assembly (1) is in the initial state, several expansion plates (1032) are closed and flush with the side wall of the mounting cylinder (1031). When the expansion assembly (1) is in the deformed state, several driving connecting rods (1034) drive several expansion plates (1032) to protrude to the outside of the mounting cylinder (1031). The mounting cylinder (1031) and several expansion plates (1032) form a trumpet-shaped structure. The trumpet-shaped structure is used to drive the deformation expansion assembly (2) to deform to the second expansion state.

5. The internal expansion tool clamping device according to claim 1, characterized in that, The expansion sleeve structure (201) also includes a guide rod (2013), a guide groove (2014), and a return spring (2015). A plurality of guide rods (2013) are respectively installed on a plurality of rotating ends (2012), a plurality of guide grooves (2014) are respectively opened on the inclined surfaces of a plurality of inner expansion ends (2011), and a plurality of guide rods (2013) are respectively slidably connected in a plurality of guide grooves (2014). A plurality of guide rods (2013) and a plurality of guide grooves (2014) are connected by a plurality of return springs (2015). The guide rods (2013) are curved rod structures.

6. The internal expansion tool clamping device according to claim 1, characterized in that, The insertion block positioning structure (3) includes a slider (301), a crank arm (302), a reciprocating connecting rod (303), a slide bar (304), and a positioning component (305). A plurality of sliders (301) are slidably connected to the inner sides of a plurality of inner expansion ends (2011). A plurality of crank arms (302) are respectively mounted on a plurality of sliders (301), and the plurality of crank arms (302) are slidably connected to the inner sides of a plurality of inner expansion ends (2011). The two ends of each crank arm (302) are movably connected to two reciprocating connecting rods (303). The plurality of reciprocating connecting rods (303) are movably connected to a plurality of sliding rods (304), and the plurality of sliding rods (304) are slidably connected to a plurality of inner expansion ends (2011). Above, several positioning components (305) are respectively installed at the ends of several slide rods (304), and several positioning components (305) are respectively movably connected in the grooves opened on the surface of several inner expansion ends (2011). When the insert block positioning structure (3) is in the retracted state, several positioning components (305) are retracted into the grooves. When the insert block positioning structure (3) is in the extended state, several positioning components (305) protrude from the grooves to form a protruding buckle structure, and the protruding buckle structure is used to buckle and fix the tool with the corresponding shaped groove.

7. The internal expansion tool clamping device according to claim 3, characterized in that, The expansion sleeve rear end support member (102) is provided with several equidistant annular limiting grooves (1021), and several sliders (301) are respectively slidably connected in several limiting grooves (1021). The expansion sleeve rear end support member (102) is connected to the output end of a rotary drive unit (1022), and the rotary drive unit (1022) is mounted on a fixed base (101).

8. The internal expansion tool clamping device according to claim 6, characterized in that, The positioning component (305) includes a first positioning block (3051) and a second positioning block (3052); The first positioning blocks (3051) are all hexagonal columnar structures, and the second positioning blocks (3052) are all frustum-shaped structures. Each inner expansion end (2011) has a first positioning block (3051) and a second positioning block (3052) on its two sides respectively.

Images