A drill bit bore expander clamp and method of use

Abstract

The application discloses a drill inner hole supporting and expanding clamp and a use method thereof, and relates to the technical field of drill supporting and expanding clamps. The drill inner hole supporting and expanding clamp comprises a communicating head which is arranged on the bottom end of a rotating head, a sliding column sleeve is fixedly arranged at the bottom of the communicating head, an annular piece is fixedly arranged at the bottom end of the sliding column sleeve, and a liquid cavity is arranged in the rotating head. The supporting and expanding arc piece, the sliding column and other structures are arranged, liquid is injected into the liquid cavity, the sliding plate is pushed downward by using hydraulic pressure, the supporting and expanding head is used to expand the supporting and expanding arc piece outward, and the supporting and expanding arc piece is used to support and expand and fix in the inner hole of the drill. The inner hole of the drill is in a triangular cam shape in the plan view, the drill can be rotated under the action of the expanding force and the guidance of the arc surface of the inner hole during the expansion, the supporting and expanding arc piece can be expanded to the farthest end of the inner hole in the triangular cam shape, and the relative sliding between the supporting and expanding arc piece and the inner hole of the drill can be avoided after the three supporting and expanding arc pieces are supported and expanded and fixed during operation.

Description

Technical Field

[0001] This invention relates to the field of drill bit expansion clamp technology, and in particular to a drill bit inner hole expansion clamp and its method of use. Background Technology

[0002] In CNC machine tools and automated machining production lines, drilling power heads are typically equipped with automatic tool changers to enable rapid replacement of drill bits or other cutting tools, thereby meeting the demands of continuous and high-efficiency production. Existing power head clamping mechanisms, whether using spring collets to hold the outer diameter of the drill bit or using internal support clamps driven by built-in hydraulic cylinders, generally face problems such as complex structures, difficult wiring, and high maintenance costs.

[0003] Specifically, to achieve the locking and unlocking of the drill bit, traditional power heads often need to integrate electrical control components, such as miniature servo motors, electromagnets, proximity switches, or rotary encoders, inside or at the end of the rotating spindle, and introduce power and signal lines through slip rings or rotary joints. This design has the following drawbacks: Rotary cabling is difficult and unreliable. Cables located at the rotary head rotate at high speed with the spindle, making them highly susceptible to tangling, fatigue breakage, or loosening of connectors due to centrifugal force, leading to signal transmission interruptions or short circuits. Cutting fluid and oil contaminants from the machining process can easily penetrate the electrical interfaces of rotating parts, causing component damage and severely impacting the equipment's lifespan and stability. Furthermore, structural maintenance is inconvenient. If electrical components inside the rotary head malfunction, repair requires disassembling the entire spindle unit, which is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a drill bit inner hole expansion clamp and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A drill bit borehole expansion clamp includes a connecting head installed at the bottom of a rotating head. A sliding sleeve is fixed to the bottom of the connecting head, and an annular plate is fixed to the bottom end of the sliding sleeve. A liquid cavity is provided inside the rotating head, and a sliding plate is slidably connected to the liquid cavity. A sliding column is fixed to the bottom of the sliding plate, and the bottom end of the sliding column passes through the sliding sleeve and is connected to an expansion head. The bottom end of the expansion head has a frustum-shaped structure with a gradually decreasing radius. Circumferentially distributed expansion arc plates are provided on the outer side of the expansion head, and the bottom ends of multiple expansion arc plates are inclined and converge towards the center. The top of the expansion arc plate has a strip groove, and the bottom of the annular plate is fixed with a guide bar arranged in the radial direction. The guide bar is circumferentially distributed. The expansion arc plate slides on the outer wall of the guide bar through the strip groove. When the expansion arc plate is pushed outward, it can be tightly locked into the inner hole of the drill bit. A piston cylinder is installed on one side of the connecting head. A piston assembly for sealing the piston cylinder is provided inside the piston cylinder. The inner hole of the drill bit has a triangular cam-shaped structure in plan view. Adjacent expansion arc plates are connected by an elastic membrane.

[0006] As a preferred embodiment of the present invention: the piston assembly includes a piston, an inner support is fixed inside the piston cylinder, a piston rod is slidably connected inside the inner support, the piston is fixed to the end of the piston rod, the piston and the inner support are connected by an inner spring, and the piston seals the end of the piston cylinder based on the force of the inner spring.

[0007] As a preferred embodiment of the present invention: the rotating head is used in conjunction with a movement control mechanism, the movement control mechanism including a support frame, a transverse rail mounted on the support frame, an electric slide block sliding laterally on the transverse rail, a vertical rail fixed to one end of the electric slide block, an electric lifting seat sliding vertically connected inside the vertical rail, the rotating head being rotatably mounted at the bottom of the electric lifting seat, and a rotation control part for controlling the rotating head being provided inside the electric lifting seat.

[0008] As a preferred embodiment of the present invention: the piston cylinder is used in conjunction with a liquid supply mechanism, the liquid supply mechanism including a liquid supply device, the liquid supply device being installed on the outer wall of one side of the support frame, the liquid supply end of the liquid supply device being equipped with a liquid supply pipe, the liquid supply end of the liquid supply device being equipped with a liquid suction pipe, the liquid supply pipe and the liquid suction pipe being connected together to an electrically controlled three-way valve, one end of the electrically controlled three-way valve being connected to an end assembly adapted to the piston cylinder through a connecting pipe.

[0009] As a preferred embodiment of the present invention: the end assembly includes an end tube, which is fixed to one end of the connecting pipe, and an end head is fixed to one end of the end tube. The outer side of the end head is provided with evenly distributed drainage holes, and the diameter of the end head is smaller than the inner diameter of the piston cylinder end. An electric telescopic cylinder is installed on the support frame, and a translation frame is fixed to the output end of the electric telescopic cylinder. The end tube is fixed to the translation frame.

[0010] As a preferred embodiment of the present invention: a fixed sleeve is fixed to the outer side of the end tube, a sliding sleeve is slidably connected to the inner wall of the fixed sleeve, an annular baffle is fixed to one end of the sliding sleeve, the annular baffle and the fixed sleeve are connected by a baffle spring, and a sealing gasket is fixed to one side of the outer wall of the annular baffle.

[0011] As a preferred embodiment of the present invention, the end and the annular baffle are connected by an annular elastic connecting part.

[0012] As a preferred embodiment of the present invention: a fixed bracket is fixed on the piston cylinder, a reference base is fixed on the fixed bracket, a laser ranging component is fixed on one side of the support frame, the position of the laser ranging component is adapted to the reference base, the laser ranging component is signal connected to a control module, and the control module is electrically connected to an electric lifting seat, an electric sliding seat, a liquid supply device, a rotation control unit, and an electrically controlled three-way valve.

[0013] As a preferred embodiment of the present invention: a lifting control cylinder is fixed on one side of the support frame, the output end of the lifting control cylinder is fixed to the outer wall of the top of the lifting frame, the lifting frame is slidably connected to the outer wall of the support frame, a drill bit carrier is rotatably mounted on the outer wall of the lifting frame, the drill bit carrier is provided with circumferentially distributed protruding teeth, an mounting frame is fixed on the lifting frame, a motor is mounted on the mounting frame, a drive gear is mounted on the output end of the motor, the drive gear meshes with the protruding teeth, and a circumferentially distributed receiving box is provided on the drill bit carrier, the receiving box is provided with a receiving cavity for placing the drill bit.

[0014] A method for using a drill bit internal bore expansion clamp includes the following steps: S1: The mobile control mechanism controls the electric lifting seat to move to the change station; S2: The rotation control unit controls the rotation of the rotating head until the laser ranging component accurately detects the reference point; S3: The motor controls the rotation of the drill bit carrier, moving the housing containing the drill bit below the expansion plate; S4: The lifting control cylinder controls the lifting frame to move upward, so that the expansion arc plate enters the inner hole of the drill bit; S5: The electric telescopic cylinder is in operation, inserting the end into the piston cylinder; S6: The electrically controlled three-way valve is activated, connecting the liquid supply pipe to the connecting pipe; S7: The liquid supply device works, injecting liquid into the liquid chamber, causing the expansion arc plate to expand into the inner hole of the drill bit; S8: Each structure is reset in sequence to complete the installation of the drill bit.

[0015] The beneficial effects of this invention are as follows: 1. This invention, by setting up structures such as expansion arc plates and sliding columns, enables the injection of liquid into the liquid cavity to push the sliding plate downward using hydraulic pressure. This, in turn, uses the expansion head to expand the expansion arc plates outward, thereby securing them within the drill bit's inner bore. The drill bit's inner bore, viewed from above, has a triangular cam-shaped cross-section. During expansion, the drill bit rotates under the influence of the expansion force and the guidance of the inner bore's arc surface, allowing the expansion arc plates to reach the farthest point of the triangular cam-shaped inner bore. Thus, after being secured by the three expansion arc plates, relative sliding between the expansion arc plates and the drill bit's inner bore is avoided during operation.

[0016] 2. By setting an elastic membrane, the present invention can cause the expansion arc sheet to reset based on the elastic force of the elastic membrane when the liquid is drawn out of the liquid cavity.

[0017] 3. By setting up a liquid supply mechanism, the present invention can control the connecting head to move to a set position based on the movement control mechanism when the drill bit needs to be installed or removed. The electric telescopic cylinder works to push the end head into the piston cylinder. During the process, the sealing gasket of the annular baffle first makes close contact with the end of the piston cylinder. The end head pushes the piston away. Liquid is injected or pumped into the piston cylinder through the liquid supply device, thereby realizing the movement control of the expansion arc plate.

[0018] 4. By setting up a laser ranging component, a reference anchor, and other structures, this invention enables the rotating head to rotate after the connecting head has moved into position, based on the operation of the rotation control unit. The laser ranging component detects the position of the reference anchor in real time. When the reference anchor rotates to a position that matches the laser ranging component, the control module controls the rotation control unit to stop working. At this time, the piston cylinder is located on the movement path of the end head, and the electric telescopic cylinder controls the translation frame to extend, thus realizing the insertion of the end head into the piston cylinder.

[0019] 5. This invention, through the inclusion of a drill bit carrier and a lifting control cylinder, allows for the placement of different types of drill bits within the receiving box. When the connecting head moves to the changing position, the motor drives the drive gear to rotate, causing the corresponding receiving box on the drill bit carrier to move below the connecting head. Based on the operation of the lifting control cylinder, the drill bit carrier moves upward, allowing the expansion flange to smoothly enter the inner hole of the drill bit, facilitating subsequent fixing and installation of the drill bit. 6. In this invention, the drill bit carrier and fluid supply mechanism for changing drill bits are both located on the outside. No additional electrical structure is required at the rotating head to control the movement of the expansion arc plate, and no complex wiring is required. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a drill bit inner hole expansion clamp proposed in this invention; Figure 2 This is a schematic diagram of the structure of a drill bit inner hole expansion clamp support frame and transverse track proposed in this invention; Figure 3 This is a schematic diagram of the drill bit carrier frame of the drill bit inner hole expansion clamp proposed in this invention; Figure 4 This is a schematic diagram of the fluid supply mechanism for a drill bit inner hole expansion clamp proposed in this invention; Figure 5 This is a cross-sectional schematic diagram of the end tube of a drill bit inner hole expansion clamp proposed in this invention; Figure 6 This is a schematic diagram of the connecting head and expansion arc plate of a drill bit inner hole expansion clamp proposed in this invention; Figure 7 This is a cross-sectional schematic diagram of the connecting head and piston cylinder of a drill bit inner hole expansion clamp proposed in this invention.

[0021] In the diagram: 1-Support frame; 2-Horizontal rail; 3-Vertical rail; 4-Workbench; 5-Drill bit carrier; 6-Liquid supply device; 7-Laser rangefinder assembly; 8-Electric slide; 9-Electric lifting seat; 10-Drill bit; 11-Lifting frame; 12-Protruding tooth; 13-Mounting frame; 14-Drive gear; 15-Motor; 16-Lifting control cylinder; 17-Suction pipe; 18-Liquid supply pipe; 19-Electrically controlled three-way valve; 20-Electric telescopic cylinder; 21-Transfer frame; 22-End; 23-Connecting pipe; 2 4-End tube; 25-Baffle spring; 26-Annular baffle; 27-Sealing gasket; 28-Annular elastic connection; 29-Sliding sleeve; 30-Fixed sleeve; 31-Rotating head; 32-Connecting head; 33-Expansion arc plate; 34-Elastic membrane; 35-Reference column; 36-Fixed bracket; 37-Piston cylinder; 38-Piston; 39-Inner spring; 40-Inner bracket; 41-Piston rod; 42-Liquid chamber; 43-Slide plate; 44-Sliding column; 45-Strip groove; 46-Expansion head; 47-Sliding column sleeve. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1: A drill bit inner bore expansion clamp, such as Figures 1-7As shown, the device includes a connecting head 32 installed at the bottom of the rotating head 31. A sliding column sleeve 47 is fixed to the bottom of the connecting head 32, and an annular plate is fixed to the bottom end of the sliding column sleeve 47. A liquid cavity 42 is provided inside the rotating head 31, and a sliding plate 43 is slidably connected to the liquid cavity 42. A sliding column 44 is fixed to the bottom of the sliding plate 43. The bottom end of the sliding column 44 passes through the sliding column sleeve 47 and is connected to a support head 46. The bottom end of the support head 46 has a frustum-shaped structure with a gradually decreasing radius. A circumferentially distributed support arc is provided on the outer side of the support head 46. The bottom ends of multiple expansion arc plates 33 are inclined and converge towards the center. The top of the expansion arc plate 33 is provided with a strip groove 45. The bottom of the annular plate is fixed with a guide bar arranged in the radial direction. The guide bar is circumferentially distributed. The expansion arc plate 33 slides on the outer wall of the guide bar through the strip groove 45. When the expansion arc plate 33 is pushed outward, it can be tightly locked into the inner hole of the drill bit 10. A piston cylinder 37 is installed on one side of the connecting head 32. A piston assembly for sealing the piston cylinder 37 is provided inside the piston cylinder 37. By setting up structures such as expansion arc plate 33 and sliding column 44, liquid can be injected into the liquid cavity 42, and the slide plate 43 can be pushed downward by hydraulic pressure. Then, the expansion head 46 can be used to expand the expansion arc plate 33 outward, thereby expanding and fixing the expansion arc plate 33 in the inner hole of the drill bit 10. Preferably, the inner bore of the drill bit 10 has a non-circular cross-section when viewed from above, which can be a triangular cam-shaped structure. The triangular cam shape allows the drill bit 10 to rotate under the action of the expansion force and the guidance of the arc surface of the inner bore during expansion. This enables the expansion plate 33 to reach the farthest end of the triangular cam-shaped inner bore. After being expanded and fixed by the three expansion plates 33, relative sliding between the expansion plates 33 and the inner bore of the drill bit 10 can be avoided during operation.

[0025] To facilitate control of the piston cylinder 37's on / off state; such as Figure 7 As shown, the piston assembly includes a piston 38, an inner support 40 fixed inside the piston cylinder 37, a piston rod 41 slidably connected inside the inner support 40, a piston 38 fixed to the end of the piston rod 41, and a piston 38 connected to the inner support 40 by an inner spring 39. The piston 38 seals the end of the piston cylinder 37 based on the force of the inner spring 39.

[0026] To facilitate the repositioning of the expansion arc plate 33; such as Figure 6 As shown, adjacent expansion arc plates 33 are connected by an elastic membrane 34; By setting the elastic membrane 34, when the liquid is drawn out of the liquid chamber 42, the elastic membrane 34 can be used to cause the expansion arc plate 33 to reset.

[0027] To facilitate control of drill bit 10 operation; such as Figure 2As shown, the rotating head 31 is used in conjunction with a movement control mechanism. The movement control mechanism includes a support frame 1, a transverse rail 2 is installed on the support frame 1, an electric slide block 8 slides laterally on the transverse rail 2, a vertical rail 3 is fixed to one end of the electric slide block 8, an electric lifting seat 9 is slidably connected up and down in the vertical rail 3, the rotating head 31 is rotatably installed at the bottom of the electric lifting seat 9, and the electric lifting seat 9 is provided with a rotation control part for controlling the rotation of the rotating head 31. A work platform 4 is installed below the horizontal track 2; Specifically, the control methods for the electric slide 8 and the electric lifting seat 9 can adopt conventional technologies such as linear motors and lead screw motors.

[0028] To facilitate control of the expansion and inward contraction of the expansion arc plate 33; such as... Figure 3-5 As shown, the piston cylinder 37 is used in conjunction with a liquid supply mechanism, which includes a liquid supply device 6. The liquid supply device 6 is installed on the outer wall of one side of the support frame 1. The liquid supply end of the liquid supply device 6 is equipped with a liquid supply pipe 18, and the liquid suction end of the liquid supply device 6 is equipped with a liquid suction pipe 17. The liquid supply pipe 18 and the liquid suction pipe 17 are connected to an electrically controlled three-way valve 19. One end of the electrically controlled three-way valve 19 is connected to an end assembly adapted to the piston cylinder 37 through a connecting pipe 23.

[0029] To facilitate liquid injection and aspiration; such as Figure 5 As shown, the end assembly includes an end tube 24, which is fixed to one end of the connecting tube 23. An end 22 is fixed to one end of the end tube 24. The end 22 has evenly distributed drainage holes on its outer side. The diameter of the end 22 is smaller than the inner diameter of the piston cylinder 37. An electric telescopic cylinder 20 is installed on the support frame 1. A translation frame 21 is fixed to the output end of the electric telescopic cylinder 20. The end tube 24 is fixed to the translation frame 21.

[0030] To improve structural sealing; such as Figure 5 As shown, a fixing sleeve 30 is fixed to the outside of the end tube 24, and a sliding sleeve 29 is slidably connected to the inner wall of the fixing sleeve 30. An annular baffle 26 is fixed to one end of the sliding sleeve 29. The annular baffle 26 and the fixing sleeve 30 are connected by a baffle spring 25. A sealing gasket 27 is fixed to one side of the outer wall of the annular baffle 26.

[0031] To improve structural sealing; such as Figure 5 As shown, the end 22 and the annular baffle 26 are connected by an annular elastic connecting part 28; By setting up a liquid supply mechanism, when the drill bit 10 needs to be installed or removed, the connecting head 32 can be moved to a set position based on the movement control mechanism. The electric telescopic cylinder 20 works to push the end head 22 into the piston cylinder 37. During the process, the sealing gasket 27 of the annular baffle 26 first comes into close contact with the end of the piston cylinder 37. The end head 22 pushes the piston 38 away. Liquid is injected or pumped into the piston cylinder 37 through the liquid supply device 6, thereby realizing the movement control of the expansion arc plate 33.

[0032] To ensure that end cap 22 can accurately enter piston cylinder 37; such as Figure 2 , Figure 6 As shown, a fixed bracket 36 is fixed on the piston cylinder 37, and a reference bracket 35 is fixed on the fixed bracket 36. A laser ranging component 7 is fixed on one side of the support frame 1. The position of the laser ranging component 7 is adapted to the reference bracket 35. The laser ranging component 7 is signal-connected to a control module. The control module is electrically connected to the electric lifting seat 9, the electric sliding seat 8, the liquid supply device 6, the rotation control unit, and the electric three-way valve 19. By setting up structures such as the laser ranging component 7 and the reference holder 35, after the connecting head 32 moves into position, the rotation control unit works to drive the rotating head 31 to rotate. The laser ranging component 7 detects the position of the reference holder 35 in real time. When the reference holder 35 rotates to a position that matches the laser ranging component 7, the control module controls the rotation control unit to stop working. At this time, the piston cylinder 37 is located on the movement path of the end 22. The electric telescopic cylinder 20 controls the translation frame 21 to extend, so that the end 22 can be inserted into the piston cylinder 37.

[0033] To facilitate automatic replacement of drill bit 10; such as Figure 2 , Figure 3 As shown, a lifting control cylinder 16 is fixed on one side of the support frame 1. The output end of the lifting control cylinder 16 is fixed to the top outer wall of the lifting frame 11. The lifting frame 11 is slidably connected to the outer wall of the support frame 1. A drill bit carrier 5 is rotatably mounted on the outer wall of the lifting frame 11. The drill bit carrier 5 is provided with circumferentially distributed protruding teeth 12. A mounting frame 13 is fixed on the lifting frame 11. A motor 15 is mounted on the mounting frame 13. A drive gear 14 is mounted on the output end of the motor 15. The drive gear 14 meshes with the protruding teeth 12. A circumferentially distributed receiving box is provided on the drill bit carrier 5. The receiving box is provided with a receiving cavity for placing the drill bit 10. By setting up structures such as the drill bit carrier 5 and the lifting control cylinder 16, different models of drill bits 10 can be placed in the housing box. When the connecting head 32 moves to the change station, the motor 15 drives the drive gear 14 to rotate, so that the corresponding housing box on the drill bit carrier 5 moves to below the connecting head 32. Based on the operation of the lifting control cylinder 16, the drill bit carrier 5 is driven to move upward, so that the expansion arc plate 33 can smoothly enter the inner hole of the drill bit 10, so as to facilitate the subsequent fixed installation of the drill bit 10.

[0034] Example 2: A method for using a drill bit inner bore expansion clamp, comprising the following steps: S1: The mobile control mechanism controls the electric lifting platform 9 to move to the change station; S2: The rotation control unit controls the rotation head 31 to rotate until the laser ranging component 7 accurately detects the reference point 35; S3: Motor 15 controls the drill bit carrier 5 to rotate, moving the receiving box with drill bit 10 to below the expansion arc plate 33; S4: The lifting control cylinder 16 controls the lifting frame 11 to move upward, so that the expansion arc plate 33 enters the inner hole of the drill bit 10; S5: The electric telescopic cylinder 20 operates, inserting the end 22 into the piston cylinder 37; S6: The electrically controlled three-way valve 19 is activated, connecting the liquid supply pipe 18 to the connecting pipe 23; S7: The liquid supply device 6 operates, injecting liquid into the liquid chamber 42, causing the expansion arc plate 33 to expand into the inner hole of the drill bit 10; S8: Each structure is reset in sequence to complete the installation of drill bit 10.

[0035] For the parts not disclosed in detail in this invention, such as necessary control modules, specific control methods, signal transmission methods, power supply methods, etc., those skilled in the art can ensure the smooth implementation of the solution of this invention based on common sense, normal thinking logic and existing technology.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drill bit inner bore expansion clamp, characterized in that, Includes a connecting head (32) installed at the bottom of the rotating head (31), a sliding column sleeve (47) fixed at the bottom of the connecting head (32), an annular plate fixed at the bottom of the sliding column sleeve (47), a liquid cavity (42) provided inside the rotating head (31), a sliding plate (43) sealed and slidably connected inside the liquid cavity (42), a sliding column (44) fixed at the bottom of the sliding plate (43), the bottom end of the sliding column (44) passing through the sliding column sleeve (47) and connected to a support head (46), the bottom end of the support head (46) is a frustum-shaped structure with a gradually decreasing radius; the outer side of the support head (46) is provided with circumferentially distributed support arc plates (33), the bottom ends of multiple support arc plates (33) facing inward. The core tilts and converges, and the top of the expansion arc plate (33) is provided with a strip groove (45). The bottom of the annular plate is fixed with a guide strip arranged in the radial direction. The guide strip is circumferentially distributed. The expansion arc plate (33) slides on the outer wall of the guide strip through the strip groove (45). When the expansion arc plate (33) is pushed outward, it can be tightly locked in the inner hole of the drill bit (10). A piston cylinder (37) is installed on one side of the connecting head (32). A piston assembly for sealing the piston cylinder (37) is provided inside the piston cylinder (37). The inner hole of the drill bit (10) has a triangular cam-shaped structure in the plan view. The adjacent expansion arc plates (33) are connected by an elastic membrane (34).

2. The drill bit inner hole expansion clamp according to claim 1, characterized in that, The piston assembly includes a piston (38), an inner support (40) fixed inside the piston cylinder (37), a piston rod (41) slidably connected inside the inner support (40), the piston (38) is fixed to the end of the piston rod (41), the piston (38) and the inner support (40) are connected by an inner spring (39), and the piston (38) seals the end of the piston cylinder (37) based on the force of the inner spring (39).

3. The drill bit inner hole expansion clamp according to claim 2, characterized in that, The rotating head (31) is used in conjunction with a movement control mechanism, which includes a support frame (1), a transverse rail (2) installed on the support frame (1), an electric slide (8) that slides laterally on the transverse rail (2), a vertical rail (3) fixed at one end of the electric slide (8), an electric lifting seat (9) that slides up and down inside the vertical rail (3), the rotating head (31) is rotatably installed at the bottom of the electric lifting seat (9), and a rotation control part for controlling the rotating head (31) is provided inside the electric lifting seat (9).

4. A drill bit inner hole expansion clamp according to claim 3, characterized in that, The piston cylinder (37) is used in conjunction with a liquid supply mechanism, which includes a liquid supply device (6). The liquid supply device (6) is installed on the outer wall of one side of the support frame (1). The liquid supply end of the liquid supply device (6) is equipped with a liquid supply pipe (18), and the liquid suction end of the liquid supply device (6) is equipped with a liquid suction pipe (17). The liquid supply pipe (18) and the liquid suction pipe (17) are connected together to an electrically controlled three-way valve (19). One end of the electrically controlled three-way valve (19) is connected to an end assembly adapted to the piston cylinder (37) through a connecting pipe (23).

5. A drill bit inner hole expansion clamp according to claim 4, characterized in that, The end assembly includes an end tube (24), which is fixed to one end of the connecting tube (23). One end of the end tube (24) is fixed with an end head (22). The end head (22) has evenly distributed drainage holes on its outer side. The diameter of the end head (22) is smaller than the inner diameter of the piston cylinder (37). An electric telescopic cylinder (20) is installed on the support frame (1). A translation frame (21) is fixed to the output end of the electric telescopic cylinder (20). The end tube (24) is fixed on the translation frame (21).

6. A drill bit inner hole expansion clamp according to claim 5, characterized in that, A fixing sleeve (30) is fixed on the outside of the end tube (24). A sliding sleeve (29) is slidably connected to the inner wall of the fixing sleeve (30). An annular baffle (26) is fixed at one end of the sliding sleeve (29). The annular baffle (26) and the fixing sleeve (30) are connected by a baffle spring (25). A sealing gasket (27) is fixed on one side of the outer wall of the annular baffle (26).

7. A drill bit inner hole expansion clamp according to claim 6, characterized in that, The end (22) and the annular baffle (26) are connected by an annular elastic connection (28).

8. A drill bit inner hole expansion clamp according to claim 4, characterized in that, A fixed bracket (36) is fixed on the piston cylinder (37), and a reference base (35) is fixed on the fixed bracket (36). A laser ranging component (7) is fixed on one side of the support frame (1). The position of the laser ranging component (7) is adapted to the reference base (35). The laser ranging component (7) is connected to a control module. The control module is electrically connected to the electric lifting seat (9), the electric sliding seat (8), the liquid supply device (6), the rotation control unit, and the electric three-way valve (19).

9. A drill bit inner hole expansion clamp according to claim 8, characterized in that, A lifting control cylinder (16) is fixed on one side of the support frame (1). The output end of the lifting control cylinder (16) is fixed to the top outer wall of the lifting frame (11). The lifting frame (11) is slidably connected to the outer wall of the support frame (1). A drill bit carrier (5) is rotatably mounted on the outer wall of the lifting frame (11). A circumferentially distributed toothed protrusion (12) is provided on the drill bit carrier (5). A mounting frame (13) is fixed on the lifting frame (11). A motor (15) is mounted on the mounting frame (13). A drive gear (14) is installed at the output end of the motor (15). The drive gear (14) meshes with the toothed protrusion (12). A circumferentially distributed receiving box is provided on the drill bit carrier (5). A receiving cavity for placing the drill bit (10) is provided inside the receiving box.

10. A method of using a drill bit inner bore expansion clamp, characterized in that, Includes the following steps: S1: The mobile control mechanism controls the electric lifting seat (9) to move to the change station; S2: The rotation control unit controls the rotating head (31) to rotate until the laser ranging component (7) accurately detects the reference point (35). S3: The motor (15) controls the drill bit carrier (5) to rotate, moving the housing with the drill bit (10) to below the expansion arc plate (33); S4: The lifting control cylinder (16) controls the lifting frame (11) to move upward, so that the expansion arc plate (33) enters the inner hole of the drill bit (10); S5: The electric telescopic cylinder (20) operates, inserting the end (22) into the piston cylinder (37); S6: The electrically controlled three-way valve (19) is activated, connecting the liquid supply pipe (18) with the connecting pipe (23); S7: The liquid supply device (6) works to inject liquid into the liquid chamber (42), so that the expansion arc plate (33) expands into the inner hole of the drill bit (10); S8: Each structure is reset in sequence to complete the installation of the drill bit (10).

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