A tool holder clamping structure and machining equipment

Abstract

The application discloses a tool holder clamping structure and machining equipment, the tool holder clamping structure includes the tool holder body connected with the output shaft, the tool holder body is provided with a through hole, one end of the through hole is slidably connected with a collet, the collet is provided with a clamping hole, the other end of the through hole is slidably connected with an extension assembly, one end of the extension assembly is connected with the collet, the other end of the extension assembly is rotatably connected with a rotating pin, an adjusting hole is radially arranged on the hole wall of the through hole, an adjusting assembly is arranged in the adjusting hole, the adjusting assembly can correct the position of the collet to compensate the accuracy. In the process of tool changing, the rotating pin is rotatably connected with the extension assembly, the rotating pin does not rotate when the collet rotates, so that the tool changing assembly and the output shaft do not interfere with each other, that is, the output shaft can drive the collet to rotate slowly at this time, the influence of gravity, insufficient precision of the manipulator and other factors is overcome, the axis of the tool can gradually coincide with the axis of the collet, and the installation precision of the tool is improved.

Description

Technical Field

[0001] This invention relates to the field of machining, and more particularly to a tool holder clamping structure and machining equipment. Background Technology

[0002] With the continuous development of modern industrial production technology, machining is covering an increasingly larger area in actual production sites and occupying an increasingly important position, becoming a core component of modern manufacturing technology. Among these aspects, the precision of machining is one of the key concerns. In machining, the cutting tool is the direct tool used to process the workpiece; therefore, its precision affects the overall precision of the machining process. Thus, ensuring the precision of the cutting tool is a crucial issue in the field of machining.

[0003] In conventional machining scenarios, machining equipment is typically equipped with a clamping structure to hold the cutting tool. During tool installation, a robotic arm places the tool into the clamping structure, which then secures it. The clamping accuracy of this structure depends on the accuracy of the robotic arm. Sufficient robotic arm accuracy ensures that the tool's axis coincides with the clamping mechanism's axis. However, in actual machining processes, factors such as gravity and insufficient robotic arm accuracy can prevent the tool from being accurately placed into the clamping structure. Furthermore, as machining progresses, factors like vibration can further reduce the tool's positioning accuracy. In other words, current clamping structures cannot guarantee tool clamping accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a tool holder clamping structure and processing equipment to solve the problem that current clamping structures cannot guarantee tool clamping accuracy.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A tool holder clamping structure includes a tool holder body for connection with an output shaft, the tool holder body having a through hole;

[0007] A collet is slidably connected to one end of the through hole, and the collet has a clamping hole; when the collet slides in the direction extending out of the through hole, the clamping hole expands; when the collet slides in the direction extending into the through hole, the clamping hole contracts.

[0008] An extension assembly is slidably connected to the other end of the through hole. One end of the extension assembly is connected to the collet, and the other end of the extension assembly is rotatably connected to a rotating pin. When the rotating pin is subjected to external force, it can move in the direction close to the collet.

[0009] An adjustment hole is provided radially on the wall of the through hole, and an adjustment component that can move radially is provided in the adjustment hole, and the adjustment component abuts against the collet.

[0010] Optionally, the extension assembly includes a collet rod, one end of which is connected to the collet, and the other end of which is connected to the rotating pin;

[0011] The collet pull rod is externally threaded with a pull rod locking nut; a first butterfly spring is provided between the pull rod locking nut and the tool handle body, and the first butterfly spring abuts against the pull rod locking nut and the tool handle body respectively; when the collet slides along the direction extending out of the through hole, the first butterfly spring is in a compressed state.

[0012] Optionally, the extension assembly includes an extension rod connected to the collet, the extension rod having a rotating hole, and one end of the rotating pin being disposed in the rotating hole and rotatably connected to the rotating hole;

[0013] A first air passage is formed between the rotating pin and the wall of the rotating hole; the rotating pin has an air inlet hole along the axial direction, and the wall of the air inlet hole has a connecting hole, which connects the air inlet hole and the first air passage; the first air passage is connected to the clamping hole.

[0014] Optionally, a sealing groove is provided at the edge of the rotating hole near the collet; a sealing element is provided in the sealing groove, the sealing element is connected to the air inlet, and the outer diameter of the sealing element is larger than the diameter of the rotating hole;

[0015] The extension rod has a first reset boss protruding outward, and the rotating pin has a second reset boss protruding outward. A reset spring is provided between the first reset boss and the second reset boss, respectively abutting against the first reset boss and the second reset boss.

[0016] The return spring is in a compressed state, causing the rotating pin to slide away from the extension rod, and the seal is in contact with the edge of the rotating hole.

[0017] Optionally, a second air passage is formed between the collet and the tool holder body, and the first air passage communicates with the second air passage.

[0018] Optionally, the collet sleeve is provided with a limiting ring; on one side of the limiting ring, an assembly hole is radially formed on the wall of the through hole;

[0019] The assembly hole is provided with a limiting component, a limiting spring, and a limiting ball in sequence along the direction close to the limiting ring; the limiting component is connected to the tool holder body; multiple limiting grooves are formed on the outer wall of the limiting ring along its circumference, and the limiting ball is pushed into one of the limiting grooves by the limiting spring.

[0020] Optionally, a first anti-loosening groove is provided at the end of the adjusting hole away from the through hole, and a second anti-loosening groove is provided at the opening of the first anti-loosening groove;

[0021] The adjustment assembly includes a tamper-proof screw and a set screw. The outer wall of the tamper-proof screw is provided with a first external thread and a tamper-proof boss protruding from the first external thread. The tamper-proof screw is threadedly connected to the first anti-loosening groove through the first external thread. The tamper-proof boss abuts against the bottom of the second anti-loosening groove.

[0022] The anti-disassembly screw also has a first internal threaded hole, the set screw is threadedly connected to the first internal threaded hole, and the end of the set screw abuts against the collet.

[0023] Optionally, the outer ring of the set screw is provided with an anti-loosening boss, and a second butterfly spring is provided between the bottom of the first anti-loosening groove and the anti-loosening boss.

[0024] Optionally, a deformation ring is provided between the end of the set screw and the collet, and the deformation ring is sleeved on the outside of the collet;

[0025] The deformable ring has a positioning opening, and the tool holder body is threaded with a positioning screw corresponding to the position of the positioning opening, with the positioning screw extending into the positioning opening.

[0026] A processing device includes a tool-cutting assembly, an output shaft, and a tool holder clamping structure as described above. The tool-cutting assembly is disposed on one side of the rotating pin and is used to push the rotating pin to slide along the direction of extending into the through hole. The output shaft is connected to the tool holder body.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The tool holder clamping structure and processing equipment provided by this invention allow the collet to slide along the direction extending from the through hole during tool changing, thus expanding the clamping hole. During processing, the collet slides along the direction extending into the through hole, causing the clamping hole to contract and clamp the tool. During tool changing, the tool-changing assembly of the processing equipment pushes a rotating pin, causing the rotating pin to slide from the other end of the through hole along the direction extending into the through hole, allowing the collet to extend from one end of the through hole, further expanding the clamping hole. It is understood that at this time, the output shaft can drive the tool holder body, collet, and extension assembly to rotate slowly, while the rotating pin, due to its rotatable connection with the extension assembly, does not rotate, ensuring that the tool-changing assembly and the output shaft do not interfere with each other, thereby achieving slow rotation of the collet during tool changing. It is understood that because the collet rotates slowly, it can overcome the influence of gravity, insufficient precision of the robotic arm, and other factors, allowing the tool axis to gradually coincide with the collet axis, thus improving the tool installation accuracy. Meanwhile, when the positional accuracy of the collet is insufficient, the position of the collet can be changed by adjusting the position of the adjusting component, thereby correcting the position of the collet and compensating for the positional accuracy of the collet. In summary, this tool holder clamping structure and processing equipment can improve the clamping accuracy of the tool. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0031] Figure 1 This is a schematic diagram of a first cross-sectional view of the tool holder clamping structure provided in an embodiment of the present invention;

[0032] Figure 2 This is a second cross-sectional view of the tool holder clamping structure provided in an embodiment of the present invention.

[0033] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A;

[0034] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure along point BB;

[0035] Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure along point CC;

[0036] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point D;

[0037] Figure 7 This is a schematic diagram of the third cross-sectional structure of the tool holder clamping structure provided in an embodiment of the present invention;

[0038] Figure 8 for Figure 7 A magnified schematic diagram of the structure at point E.

[0039] Illustrations: 10. Tool holder body; 100. Through hole; 101. First step groove; 102. Second step groove; 103. Third step groove; 104. Fourth step groove; 105. Fifth step groove; 106. Adjustment hole; 1061. First anti-loosening groove; 1062. Second anti-loosening groove; 107. Assembly hole;

[0040] 20. Collet; 201. Clamping hole; 30. Rotating pin; 301. Air inlet; 302. Second reset boss; 303. Connecting hole;

[0041] 40. Adjustment assembly; 41. Anti-tamper screw; 411. First external threaded part; 412. Anti-tamper boss; 413. First internal threaded hole; 42. Set screw; 421. Anti-loosening boss; 43. Second butterfly spring; 44. Deformation ring; 441. Positioning opening; 45. Positioning screw;

[0042] 51. Limiting ring; 511. Limiting groove; 52. Limiting component; 53. Limiting spring; 54. Limiting ball;

[0043] 61. Clamping rod; 62. Rod locking nut; 63. First disc spring; 64. Extension rod; 641. Rotating hole; 642. First reset boss; 643. Sealing groove; 65. Reset spring; 66. Seal;

[0044] 71. Bearing; 72. Locking screw; 73. Washer; 74. Check valve; 75. Tool holder inner sleeve; 76. Tool holder lock nut. Detailed Implementation

[0045] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0046] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0047] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] Please refer to Figures 1 to 8 , Figure 1 This is a first cross-sectional view of the tool holder clamping structure provided in an embodiment of the present invention. Figure 2 This is a second cross-sectional view of the tool holder clamping structure provided in an embodiment of the present invention. Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A. Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along point BB. Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure along point CC. Figure 6 for Figure 5 A magnified structural diagram at point D. Figure 7 This is a third cross-sectional view of the tool holder clamping structure provided in an embodiment of the present invention. Figure 8 for Figure 7 A magnified schematic diagram of the structure at point E.

[0049] Example 1

[0050] The tool holder clamping structure provided in this embodiment is applied to machining equipment in a mechanical processing scenario, and it serves to clamp the tool; in this embodiment, the tool holder clamping structure is optimized to improve its precision.

[0051] like Figure 1 and Figure 2As shown, the tool holder clamping structure provided in this embodiment includes a tool holder body 10 for connection with an output shaft, the tool holder body 10 having a through hole 100; a collet 20 is slidably connected to one end of the through hole 100, the collet 20 having a clamping hole 201 for clamping workpieces such as cutting tools; when the collet 20 slides in the direction extending out of the through hole 100, the clamping hole 201 expands; when the collet 20 slides in the direction extending into the through hole 100, the clamping hole 201 contracts; wherein, a first [feature / feature] is provided at one end of the through hole 100 along the edge of the hole. The first stepped groove 101 has a tool holder inner sleeve 75 installed in it. The tool holder inner sleeve 75 has an opening corresponding to the position of the collet 20. The wall of the opening has a first conical surface, and the outer wall of the collet 20 has a second conical surface corresponding to the first conical surface. When the collet 20 slides in the direction of extending into the through hole 100, the second conical surface is squeezed by the first conical surface, causing the clamping hole 201 of the collet 20 to contract and clamp the workpiece. Conversely, when the collet 20 slides in the direction of extending out of the through hole 100, the clamping hole 201 expands.

[0052] An extension assembly is slidably connected to the other end of the through hole 100. One end of the extension assembly is connected to the collet 20, and the other end of the extension assembly is rotatably connected to a rotating pin 30. When the rotating pin 30 is subjected to external force, it can move in the direction close to the collet 20. That is, the rotating pin 30 is pushed by the cutting tool assembly in the direction of extending into the through hole 100. Correspondingly, a fourth step groove 104 is provided on the edge of the hole at the other end of the through hole 100, and one end of the extension assembly is sleeved in the fourth step groove 104. An adjustment hole 106 is provided radially on the hole wall of the through hole 100. An adjustment assembly 40 that can move radially is provided in the adjustment hole 106, and the adjustment assembly 40 abuts against the collet 20.

[0053] Specifically, during tool changing, the collet 20 slides along the direction extending out of the through hole 100, causing the clamping hole 201 to expand; during machining, the collet 20 slides along the direction extending into the through hole 100, causing the clamping hole 201 to contract and clamp the tool; wherein, during tool changing, the tool-changing assembly of the machining equipment pushes the rotating pin 30, causing the rotating pin 30 to slide from the other end of the through hole 100 along the direction extending into the through hole 100, thereby causing the collet 20 to extend from one end of the through hole 100, causing the clamping hole 201 to expand. Understandably, at this time, the output shaft can drive the tool holder body 10, collet 20, and extension assembly to rotate slowly. Since the rotating pin 30 is rotatably connected to the extension assembly, it does not rotate, ensuring that the tool changing assembly and the output shaft do not interfere with each other. This allows the collet 20 to rotate slowly during tool changing. Understandably, because the collet 20 rotates slowly, it can overcome the influence of gravity, insufficient precision of the robotic arm, and other factors, allowing the tool's axis to gradually coincide with the collet 20's axis, thus improving the tool's installation accuracy. Simultaneously, when the collet 20's positional accuracy is insufficient, the position of the adjusting component 40 can be adjusted to change the collet 20's position, completing the positional correction of the collet 20 and compensating for its positional inaccuracy. In summary, this tool holder clamping structure can improve the clamping accuracy of the tool.

[0054] In this embodiment, as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the adjusting hole 106 has a first anti-loosening groove 1061 at the end away from the through hole 100, and a second anti-loosening groove 1062 is provided at the opening of the first anti-loosening groove 1061; the adjusting assembly 40 includes an anti-disassembly screw 41 and a set screw 42. The outer wall of the anti-disassembly screw 41 has a first external thread portion 411 and an anti-disassembly boss 412 protruding from the first external thread portion 411. The anti-disassembly screw 41 is threadedly connected to the first anti-loosening groove 1061 through the first external thread portion 411, and the anti-disassembly boss 412 abuts against the bottom of the second anti-loosening groove 1062; the anti-disassembly screw 41 also has a first internal thread hole 413, and the set screw 42 is threadedly connected to the first internal thread hole 413. The end of the set screw 42 abuts against the collet 20. The anti-disassembly screw 41 prevents the set screw 42 from loosening, ensuring the positional accuracy of the set screw 42 relative to the adjustment hole 106, thereby ensuring that the set screw 42 can accurately correct the position of the collet 20.

[0055] Furthermore, such as Figure 6As shown, the outer ring of the set screw 42 is provided with an anti-loosening boss 421, and a second butterfly spring 43 is provided between the bottom of the first anti-loosening groove 1061 and the anti-loosening boss 421. The second butterfly spring 43 plays a further role in preventing loosening. The second butterfly spring 43 can act on the set screw 42 and cooperate with the anti-disassembly screw 41, so that the set screw 42 can fit more tightly with the first internal thread hole 413 of the anti-disassembly screw 41, making the set screw 42 less likely to loosen.

[0056] Furthermore, such as Figure 5 As shown, a deformable ring 44 is provided between the end of the set screw 42 and the collet 20. The deformable ring 44 is sleeved on the outside of the collet 20, and a third stepped groove 103 is opened at the bottom of the first stepped groove 101. The deformable ring 44 is sleeved in the third stepped groove 103. The deformable ring 44 has a positioning opening 441. A positioning screw 45 is threadedly connected to the tool holder body 10 at the position corresponding to the positioning opening 441. The positioning screw 45 can be a Torx screw, and the positioning screw 45 extends into the positioning opening 441. The deformable ring 44 and the collet 20 are clearance-fitted. Through the setting of the deformable ring 44, the force of the set screw 42 can be applied to the collet 20 through the deformable ring 44. That is, the movement of the set screw 42 causes the deformable ring 44 to undergo local deformation. The local deformation of the deformable ring 44 forces the collet 20 to move slightly, thereby further improving the positioning accuracy of the collet 20. In this embodiment, there are three adjustment holes 106, which are equidistantly distributed around the axis of the tool holder body 10, and the corresponding number of adjustment components 40 is also three; in other optional embodiments, there may be four or more adjustment holes 106 that are equidistantly distributed.

[0057] In this embodiment, as Figures 1 to 4 As shown, the extension assembly includes a collet pull rod 61, one end of which is connected to the collet 20, and the other end of which is connected to the rotating pin 30. A pull rod locking nut 62 is threaded onto the external part of the collet pull rod 61, and a locking hole is radially provided on the pull rod locking nut 62. A locking screw 72 is threaded into the locking hole, and the locking screw 72 abuts against the collet pull rod 61 via a pad, thereby improving the stability of the pull rod locking nut 62 on the collet pull rod 61. A first butterfly spring 63 is provided between the pull rod locking nut 62 and the tool holder body 10, and the first butterfly spring 63 abuts against both the pull rod locking nut 62 and the tool holder body 10. When the collet 20 slides along the direction extending from the through hole 100, the first butterfly spring 63 is in a compressed state. When the processing equipment is in a tool-released state, such as... Figure 1 and Figure 2As shown, at this time, the collet 20 is clamped by the inner sleeve 75 of the tool holder; after the cutting assembly of the processing equipment acts on the rotating pin 30, the rotating pin 30 moves downward, which acts on the collet pull rod 61, causing the collet pull rod 61 to move downward synchronously. At this time, through the setting of the pull rod locking nut 62, the first disc spring 63 is in a compressed state, and the clamping hole 201 of the collet 20 is expanded; after the cutting assembly of the processing equipment no longer applies force to the rotating pin 30, the first disc spring 63 returns to its original position, driving the pull rod locking nut 62 and the collet pull rod 61 to move upward, so that the rotating pin 30 returns to its original position, and at the same time, the collet 20 extends into the inner sleeve 75 of the tool holder again, so that the collet 20 is clamped by the inner sleeve 75 of the tool holder.

[0058] It should be added that a fifth step groove 105 is provided at the edge of the fourth step groove 104. A tool handle locking nut 76 is installed in the fifth step groove 105. The tool handle locking nut 76 is threadedly connected to the fifth step groove 105. The tool handle locking nut 76 serves to seal the tool handle body 10 and also serves to support the first butterfly spring 63. A washer 73 is also provided below the pull rod locking nut 62. The washer 73 is used to abut against the first butterfly spring 63 so that the elastic force of the first butterfly spring 63 can be evenly applied to the pull rod locking nut 62.

[0059] Furthermore, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the extension assembly also includes an extension rod 64, which is connected to the collet 20. The extension rod 64 has a rotating hole 641, and one end of the rotating pin 30 is disposed in the rotating hole 641 and rotatably connected to the rotating hole 641. A first air passage is formed between the rotating pin 30 and the hole wall of the rotating hole 641. The rotating pin 30 has an air inlet 301 along the axial direction, and the hole wall of the air inlet 301 has a connecting hole 303, which connects the air inlet 301 and the first air passage. The first air passage is connected to the clamping hole 201. For example, external blowing air enters the rotating pin 30 from the air inlet 301, then enters the first air passage through the connecting hole 303, and flows to the clamping hole 201. Simultaneously, when the extension assembly includes a chuck rod 61, the chuck rod 61 forms a third air passage, which is located between the first air passage and the clamping hole 201. This allows air to pass through the first and third air passages sequentially and exit from the clamping hole 201, achieving a cleaning effect. Additionally, a one-way valve 74 can be installed on the chuck rod 61. The one-way valve 74 has a set opening value; when the air pressure in the first air passage exceeds this opening value, the one-way valve 74 opens, allowing air to flow from the first air passage into the third air passage, ultimately blowing dust from the clamping hole 201. This ensures that no foreign objects enter the clamping hole 201 when the tool holder clamping structure is in the clamping state, preventing any impact on clamping accuracy.

[0060] Furthermore, a sealing groove 643 is provided at the edge of the rotating hole 641 near the collet 20; a sealing element 66 is provided in the sealing groove 643, the sealing element 66 is connected to the air inlet 301, and the outer diameter of the sealing element 66 is larger than the diameter of the rotating hole 641; the sealing element 66 includes a flat washer and a hexagon socket head cap screw, the hexagon socket head cap screw is threaded to the air inlet 301, and the flat washer further improves the sealing performance between the sealing element 66 and the first air passage; the extension rod 64 has a first reset boss 642 protruding outward, and the rotating pin 30 has a second reset boss 302 protruding outward, and a reset spring 65 is provided between the first reset boss 642 and the second reset boss 302, respectively abutting against the first reset boss 642 and the second reset boss 302; the reset spring 65 is in a compressed state, causing the rotating pin 30 to slide away from the extension rod 64, and the sealing element 66 fits against the edge of the rotating hole 641. For example, in the released state, such as Figure 7 and Figure 8 As shown, the return spring 65 applies force to the second return boss 302, causing the rotating pin 30 to move upward, which in turn causes the sealing member 66 to move upward, allowing it to fit against the edge of the rotating hole 641, thus blocking the first air passage. In the clipping state, the clipping assembly acts on the rotating pin 30, causing the rotating pin 30 to move downward against the elastic force of the return spring 65, creating a gap between the sealing member 66 and the edge of the rotating hole 641, allowing the gas in the first air passage to flow to the one-way valve 74. Through the above settings, the external dust-blowing air source can only blow dust from the clamping hole 201 in the clipping state, avoiding resource waste and preventing the airflow from affecting the clamping accuracy.

[0061] It should be added that a bearing 71 is also installed below the second reset boss 302. The bearing 71 is lifted by the reset spring 65, so that the bearing 71 abuts against the second reset boss 302. At the same time, the rotating pin 30 and the extension rod 64 are both sleeved in the bearing 71, so that the rotation of the extension rod 64 relative to the rotating pin 30 is more stable.

[0062] Furthermore, a second air passage is formed between the collet 20 and the tool holder body 10, and the first air passage is connected to the second air passage. Specifically, multiple airflow grooves are provided on the collet 20, and the gas in the first air passage can flow to the second air passage through the airflow grooves, thereby cleaning the inner sleeve 75 of the tool holder.

[0063] Based on the above embodiments, as a preferred embodiment, the extension assembly includes a clamping rod 61 and an extension rod 64, wherein, as shown... Figure 2As shown, the extension rod 64, the collet pull rod 61, and the collet 20 are arranged sequentially from top to bottom. One end of the collet pull rod 61 is threadedly connected to the collet 20, and the other end of the collet pull rod 61 is threadedly connected to the extension rod 64. Simultaneously, one end of the collet pull rod 61 is fitted into the fourth step groove 104 for positioning. Furthermore, the tool holder locking nut 76, fitted onto the collet pull rod 61, is threadedly connected to the fifth step groove 105, achieving radial positioning of the collet pull rod 61. This ensures that the collet pull rod 61 can only slide axially along the tool holder body 10 and along the axis of the tool holder body 10. The extension rod 64 is further threaded to the other end of the collet pull rod 61. A first air passage is formed between the rotating pin 30 and the wall of the rotating hole 641 on the extension rod 64. A third air passage is formed inside the collet pull rod 61, and a one-way valve 74 is installed on the collet pull rod 61. This allows the dust-blowing air source to enter the clamping hole 201 of the collet 20 through the first air passage, the one-way valve 74, and the third air passage to clean the clamping hole 201. It can also be diverted to the second air passage between the collet 20 and the tool holder body 10 to clean the tool holder inner sleeve 75. Cleaning is performed; more specifically, the dust-blowing air source enters the rotating pin 30 from the air inlet 301, then enters the first and third air passages from the connecting hole 303, and exits from the clamping hole 201, and is diverted to the second air passage, thus achieving a cleaning effect; in this embodiment, the extension rod 64 is also equipped with a return spring 65 and other structures, and the chuck pull rod 61 is also equipped with a first butterfly spring 63 and other structures, so that when the knife-breaking assembly acts on the rotating pin 30, it first overcomes the force of the return spring 65, causing the rotating pin 30 to overcome the elastic force of the return spring 65 and move downward. The movement creates a gap between the seal 66 and the edge of the rotating hole 641, allowing the gas in the first air passage to flow to the one-way valve 74. After the second reset boss 302 abuts against the first reset boss 642 via the bearing 71 and the reset spring 65, when the tool-changing assembly continues to act on the rotating pin 30, it can drive the extension rod 64 and the chuck pull rod 61 to move down synchronously, overcoming the elastic force of the first disc spring 63, causing the chuck 20 to extend out of the inner sleeve 75 of the tool holder, thus expanding the clamping hole 201. At this time, the tool can be replaced and the clamping hole 201 can be cleaned.

[0064] In this embodiment, as Figures 1 to 4As shown, a limiting ring 51 is provided on the outer sleeve of the collet 20; on one side of the limiting ring 51, an assembly hole 107 is provided radially on the wall of the through hole 100; a limiting member 52, a limiting spring 53 and a limiting ball 54 are sequentially provided in the assembly hole 107 along the direction close to the limiting ring 51; the limiting member 52 is connected to the tool holder body 10; a plurality of limiting grooves 511 are provided on the outer wall of the limiting ring 51 along its circumference, and the limiting ball 54 is pushed into one of the limiting grooves 511 by the limiting spring 53. For example, during the insertion of the collet 20 into the inner sleeve 75 of the tool holder, the collet 20 engages with the limiting ring 51 via a key connection, and the other end of the collet 20 is connected to the collet pull rod 61 via a threaded connection. That is, the collet 20 needs to be inserted into the inner sleeve 75 by rotation to achieve the connection between the collet 20 and the collet pull rod 61. During the rotation of the collet 20, the interaction between the limiting spring 53 and the limiting groove 511 of the limiting ring 51 provides a comfortable, tactile feedback when the operator twists the collet 20, allowing for more accurate installation. Additionally, a second step groove 102 is provided at the junction of the first step groove 101 and the third step groove 103, and the limiting ring 51 is installed in this second step groove 102.

[0065] In summary, the tool holder clamping structure provided in this embodiment has a collet 20 that can rotate slowly when the tool is in the holding state, resulting in higher precision. The positional accuracy of the collet 20 can be adjusted by adjusting the component 40, maintaining precision output for a longer period and allowing for real-time control. It features high precision, ease of use, and long service life. The dust-blowing structure can quickly clean the second conical surface of the collet 20 and the clamping hole 201, and the first conical surface of the tool holder inner sleeve 75 further ensures the precision and stability of the tool holder clamping. During installation, the collet 20 can be stopped at any time during installation via the setting of components such as the limiting ring 51, making the assembly of the collet 20 more convenient.

[0066] Example 2

[0067] A processing device includes a tool-cutting assembly, an output shaft, and a tool holder clamping structure as described in Embodiment 1. The tool-cutting assembly is disposed on one side of a rotating pin 30 and is used to push the rotating pin 30 to slide along the direction of insertion into the through hole 100. The output shaft is connected to the tool holder body 10. The tool-cutting assembly includes a tool-cutting cylinder, which can extend and retract along the tool-cutting direction to push the rotating pin 30. The output shaft has the ability to rotate. After the output shaft is connected to the tool holder body 10, it can drive the tool holder body 10 and the collet 20 to rotate relative to the rotating pin 30, so that the tool-cutting assembly and the output shaft of the processing device do not interfere with each other. Embodiment 1 describes the specific structure and technical effects of the tool holder clamping structure. The processing device of this embodiment uses this structure and also has its technical effects, namely, the processing device has advantages such as high precision and ease of use.

[0068] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool holder clamping structure, characterized in that, Includes a tool holder body (10) for connection with an output shaft, the tool holder body (10) having a through hole (100). A collet (20) is slidably connected to one end of the through hole (100), and the collet (20) has a clamping hole (201); when the collet (20) slides in the direction extending out of the through hole (100), the clamping hole (201) expands; when the collet (20) slides in the direction extending into the through hole (100), the clamping hole (201) contracts. An extension assembly is slidably connected to the other end of the through hole (100). One end of the extension assembly is connected to the collet (20), and the other end of the extension assembly is rotatably connected to a rotating pin (30). When the rotating pin (30) is subjected to external force, it can move in the direction close to the collet (20). An adjustment hole (106) is provided radially on the wall of the through hole (100). An adjustment component (40) that can move radially is provided in the adjustment hole (106), and the adjustment component (40) abuts against the collet (20). The extension assembly includes an extension rod (64), which is connected to the collet (20). The extension rod (64) has a rotating hole (641), and one end of the rotating pin (30) is disposed in the rotating hole (641) and rotatably connected to the rotating hole (641). A first air passage is formed between the rotating pin (30) and the wall of the rotating hole (641); the rotating pin (30) has an air inlet (301) along the axial direction, and the wall of the air inlet (301) has a connecting hole (303) that connects the air inlet (301) and the first air passage; the first air passage is connected to the clamping hole (201); A sealing groove (643) is provided at the edge of the rotating hole (641) near the hole of the collet (20); a sealing element (66) is provided in the sealing groove (643), the sealing element (66) is connected to the air inlet (301), and the outer diameter of the sealing element (66) is larger than the diameter of the rotating hole (641); The extension rod (64) is provided with a first reset boss (642), and the rotating pin (30) is provided with a second reset boss (302). A reset spring (65) is provided between the first reset boss (642) and the second reset boss (302), respectively abutting against the first reset boss (642) and the second reset boss (302). The return spring (65) is in a compressed state, causing the rotating pin (30) to slide away from the extension rod (64), and the seal (66) to fit against the edge of the rotating hole (641).

2. The tool holder clamping structure according to claim 1, characterized in that, The extension assembly includes a clamp rod (61), one end of which is connected to the collet (20), and the other end of which is rotatably connected to the rotating pin (30); The collet pull rod (61) is externally threaded with a pull rod locking nut (62); a first butterfly spring (63) is provided between the pull rod locking nut (62) and the tool handle body (10), and the first butterfly spring (63) abuts against the pull rod locking nut (62) and the tool handle body (10) respectively; when the collet (20) slides along the direction extending out of the through hole (100), the first butterfly spring (63) is in a compressed state.

3. The tool holder clamping structure according to claim 1, characterized in that, A second air passage is formed between the collet (20) and the handle body (10), and the first air passage is connected to the second air passage.

4. The tool holder clamping structure according to claim 1, characterized in that, The collet (20) is fitted with a limiting ring (51); on one side of the limiting ring (51), an assembly hole (107) is radially provided on the wall of the through hole (100). The assembly hole (107) is provided with a limiting member (52), a limiting spring (53) and a limiting ball (54) in sequence along the direction close to the limiting ring (51); the limiting member (52) is connected to the tool holder body (10); a plurality of limiting grooves (511) are provided on the outer wall of the limiting ring (51) along its circumference, and the limiting ball (54) is pushed into one of the limiting grooves (511) by the limiting spring (53).

5. The tool holder clamping structure according to claim 1, characterized in that, The adjustment hole (106) is provided with a first anti-loosening groove (1061) at one end away from the through hole (100), and a second anti-loosening groove (1062) is provided at the opening of the first anti-loosening groove (1061). The adjustment assembly (40) includes a tamper screw (41) and a set screw (42). The outer wall of the tamper screw (41) is provided with a first external thread (411) and a tamper boss (412) protruding from the first external thread (411). The tamper screw (41) is threadedly connected to the first anti-loosening groove (1061) through the first external thread (411). The tamper boss (412) abuts against the bottom of the second anti-loosening groove (1062). The anti-disassembly screw (41) is also provided with a first internal thread hole (413), the set screw (42) is threadedly connected to the first internal thread hole (413), and the end of the set screw (42) abuts against the collet (20).

6. The tool holder clamping structure according to claim 5, characterized in that, The set screw (42) has an anti-loosening boss (421) on its outer ring, and a second butterfly spring (43) is provided between the bottom of the first anti-loosening groove (1061) and the anti-loosening boss (421).

7. The tool holder clamping structure according to claim 5, characterized in that, A deformation ring (44) is provided between the end of the set screw (42) and the collet (20), and the deformation ring (44) is sleeved on the outside of the collet (20); The deformable ring (44) has a positioning opening (441), and the tool holder body (10) is threaded with a positioning screw (45) corresponding to the position of the positioning opening (441), and the positioning screw (45) extends into the positioning opening (441).

8. A processing equipment, characterized in that, The tool includes a tool break assembly, an output shaft, and a tool holder clamping structure as described in any one of claims 1-7. The tool break assembly is disposed on one side of the rotating pin (30) and is used to push the rotating pin (30) to slide along the direction of extending into the through hole (100). The output shaft is connected to the tool holder body (10).

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