Inner hole expanding clamp for crown drill bit

Abstract

The invention discloses a crown drill bit inner hole expanding clamp, and relates to the technical field of drill bit machining, the expanding clamp comprises a base, a mounting plate is arranged in the base, a drill bit is arranged above the mounting plate, and an expanding mechanism used for expanding and clamping the drill bit is arranged below the mounting plate; a positioning mechanism used for adjusting the drill bit clamping benchmark is arranged above the mounting plate, through the arrangement of a positioning ring and a guide ring, when the drill bit is arranged above the expanding and supporting plate in a sleeving mode, positioning correction can be effectively conducted on the drill bit, the drill bit is made to be arranged on the outer side of the expanding and supporting plate in a sleeving mode in a vertical state, an ejector rod drives an ejector column, and the drill bit clamping benchmark is adjusted. The wedge-shaped plate is in close contact with the expanding and supporting plate, gaps generated after expanding and supporting of the expanding and supporting plate are filled, the situation that after the expanding and supporting plate expands and supports the drill bit, expanding and supporting of the expanding and supporting plate on the drill bit are unstable due to vibration and other influences when the drill bit is machined can be avoided, and the clamping stability of the drill bit can be further improved when the drill bit is machined; and the machining efficiency and quality are improved.

Description

Technical Field

[0001] This invention relates to the field of drill bit processing technology, and in particular to a crown drill bit internal hole expansion clamp. Background Technology

[0002] Crown drill bits are a type of high-efficiency professional drilling tool that integrates multiple functions. Through unique structural design and material upgrades, they can handle complex drilling tasks. During the processing, crown drill bits are usually mounted on the spindle of machine tools such as drilling machines and machining centers. As the spindle rotates, multiple cutting edges of the drill tip simultaneously cut the workpiece material.

[0003] Crown drill bits consist of a drill body and a drill bit. Typically, a discharge hole is opened inside the drill body. During the machining process, debris and waste liquid are discharged through the discharge hole. When machining crown drill bits, in order to machine the drill body and the drill bit, the discharge hole inside the drill body is usually used as a reference. The drill body is fixed with an expansion jig, and then the drill body and the drill bit are machined.

[0004] In current technologies, when using a cylindrical expansion clamp to fix the drill body and drill bit, after the drill bit is installed on the expansion clamp, there may be a deviation between the discharge hole inside the drill body and the axis of the cylindrical expansion clamp. If expansion clamping is performed directly in this case, uneven force may occur on the inner wall of the discharge hole of the drill body, resulting in damage to the inner wall. This not only affects the processing stability of the drill bit and drill body, but may also damage the discharge hole on the inner wall of the drill body. To address this, we propose a crown drill bit inner hole expansion clamp. Summary of the Invention

[0005] To address the problem that when using a cylindrical expansion clamp to fix the drill body and drill bit, after the drill bit is installed on the expansion clamp, uneven stress may occur on the inner wall of the drill body's discharge hole due to a misalignment between the discharge hole and the axis of the cylindrical expansion clamp, potentially causing damage to the inner wall, the present invention adopts the following technical solution: A crown drill bit internal hole expansion clamp includes a base, an installation plate is provided inside the base, a drill bit is provided above the installation plate, an expansion mechanism for expanding and clamping the drill bit is provided below the installation plate, and a positioning mechanism for adjusting the drill bit clamping reference is provided above the installation plate. The expansion mechanism includes multiple movable expansion plates, with guide rings slidably connected above the expansion plates. The positioning mechanism includes a positioning ring with an arc-shaped surface above it. A spring rod is fixedly connected to one side of the positioning ring, and an L-shaped rod is fixedly connected to one side of the spring rod. The L-shaped rod is slidably connected to the mounting plate.

[0006] Preferably, the expansion mechanism further includes a housing fixedly connected to the base, and the housing is provided with a plurality of electric expansion devices. The output end of the electric expansion device is detachably connected to the outer side of the expansion plate, and the housing is fixedly connected to the mounting plate.

[0007] Preferably, the positioning mechanism further includes an electric pull rod fixedly connected to one side of the mounting plate, the output end of the electric pull rod is fixedly connected to a pull plate, the pull plate is slidably engaged with the positioning ring, and the output end of the electric pull rod is fixedly connected to the L-shaped rod.

[0008] Preferably, a partition is detachably connected to the lower part of the L-shaped rod. The partition is tapered on the side near the expansion plate. Contact rods slide in contact with both sides of the partition, and one end of the contact rod is electrically connected to the electric expansion device.

[0009] Preferably, an auxiliary mechanism for improving the stability of the expansion clamping is provided below the expansion plate. The auxiliary mechanism includes a pressure ring slidably connected to the mounting plate, and a swing plate rotatably connected to the base is provided below the pressure ring. One end of the swing plate is rotatably connected to a ring sleeve via a pin, and a top rod is fixedly connected above the ring sleeve. The top rod is tapered, and multiple top columns are slidably contacted on the surface of the top rod. One end of each top column is fixedly connected to a wedge plate.

[0010] Preferably, a plurality of sliding rods are fixedly connected to the lower part of the pressure ring, the sliding rods are slidably connected to the outer shell, the lower part of the sliding rods is in slidable contact with the surface of the swing plate, and the top rod and the ring sleeve are slidably connected to the outer shell.

[0011] Preferably, the surface of the mounting plate is provided with a groove, and the groove is set in a wedge shape away from the center line of the expansion plate. The lower part of the L-shaped rod is set in a wedge shape, and an elastic washer is provided on the upper arc surface of the L-shaped rod.

[0012] Preferably, a compression spring is provided at the sliding position between the pressure ring and the mounting plate, the inner diameter of the pressure ring is larger than the diameter of the expansion plate after it is fully expanded, and the lower end of the wedge plate is slidably connected to the base.

[0013] Preferably, a spring pad is provided above the top rod, the height of the top rod is lower than the height of the guide ring, and the sliding rod is also slidably connected to the outer shell.

[0014] Preferably, the spring rod is located inside a groove on the surface of the mounting plate, the partition below the positioning ring is slidably connected to the mounting plate, the partition is made of insulating material, and the expansion plate is made of high-strength material.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up positioning rings and guide rings, when the drill bit is sleeved on top of the expansion plate, the drill bit can be effectively positioned and corrected, so that the drill bit is sleeved on the outside of the expansion plate in a vertical state. This improves the stability of the subsequent expansion and clamping of the drill bit by the expansion plate, avoids the offset between the center line of the expansion plate and the drill bit axis, and improves the protection effect of the drill bit.

[0016] 2. By driving the top column with the top rod, the wedge plate and the expansion plate are in close contact, filling the gaps created after the expansion plate expands. This prevents the expansion plate from becoming unstable due to vibrations during the drilling process, thus further improving the stability of the drill bit during processing and increasing the efficiency and quality of the processing.

[0017] In summary, this invention overcomes the shortcomings of the prior art and has high social value and application prospects. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the positioning mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the partition and contact rod of the present invention; Figure 5 This is a schematic diagram of the expansion mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the spring rod and pull plate of the present invention; Figure 7 This is a diagram showing the motion state of the guide ring of the present invention on the expansion plate; Figure 8 This is a schematic diagram of the auxiliary mechanism of the present invention; Figure 9 This is a schematic diagram of the sliding rod and swing plate of the present invention; Figure 10 This is a schematic diagram of the top rod and swing plate of the present invention; Figure 11 This is an exploded view of the auxiliary mechanism of the present invention.

[0020] In the diagram: 1. Base; 2. Mounting plate; 3. Drill bit; 4. Positioning mechanism; 401. Electric pull rod; 402. Positioning ring; 403. L-shaped rod; 404. Pull plate; 405. Spring rod; 406. Partition plate; 407. Contact rod; 5. Expansion mechanism; 501. Housing; 502. Electric expander; 503. Expansion plate; 504. Guide ring; 6. Auxiliary mechanism; 601. Pressure ring; 602. Sliding rod; 603. Swing plate; 604. Top rod; 605. Wedge plate; 606. Top column. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figures 1 to 6 A crown drill bit inner hole expansion clamp includes a base 1, an installation plate 2 is provided inside the base 1, a drill bit 3 is provided above the installation plate 2, an expansion mechanism 5 for expanding and clamping the drill bit 3 is provided below the installation plate 2, and a positioning mechanism 4 for adjusting the clamping reference of the drill bit 3 is provided above the installation plate 2. The expansion mechanism 5 includes multiple movable expansion plates 503. A guide ring 504 is slidably connected above the expansion plate 503. The positioning mechanism 4 includes a positioning ring 402, and the upper part of the positioning ring 402 is arc-shaped. A spring rod 405 is fixedly connected to one side of the positioning ring 402. An L-shaped rod 403 is fixedly connected to one side of the spring rod 405. The L-shaped rod 403 is slidably connected to the mounting plate 2.

[0023] This invention takes into account that when the drill bit 3 needs to be processed (e.g., repairing the drill bit face of the drill bit 3), the drill bit 3 needs to be installed on the expansion clamp. Using the discharge hole inside the drill body as a reference, the drill bit 3 is clamped from the inside out. This not only protects the drill body of the drill bit 3, preventing damage from external clamping, but also effectively improves the processing effect of the drill bit part of the drill bit 3, avoiding interference with the operating space during external clamping. However, when expanding and clamping from the inside out using the discharge hole inside the drill body as a reference, the centerline of the expansion clamp may deviate from the axis of the drill body after the drill bit 3 is installed on the expansion clamp. If the drill bit 3 is clamped in this case, uneven force may occur in the discharge hole inside the drill body, potentially causing damage to the inner wall of the discharge hole and reducing the processing quality of the drill bit 3. Therefore, when it is necessary to expand and clamp the drill bit 3 from the inside out, the positioning ring 402 is first driven to move relative to the center line of the expansion plate 503. At this time, the drill bit 3 is installed on the outside of the expansion plate 503 from top to bottom. When the bottom of the drill bit 3 contacts the positioning ring 402, the bottom of the drill bit 3 will squeeze the arc surface above the positioning ring 402, causing the positioning ring 402 to move outward until the drill bit 3 stops descending. At this time, the inner side of the positioning ring 402 will always be in contact with the outer surface of the drill bit 3, so that the axis of the drill bit 3 is consistent with the center line of the expansion plate 503. This avoids the situation where the axis of the drill bit 3 is offset from the center line of the expansion plate 503 after installation, which would affect the subsequent expansion and clamping effect of the expansion plate 503 on the drill bit 3. Furthermore, when the upper arc surface of the positioning ring 402 moves outward due to the downward gravity of the drill bit 3, the positioning ring 402 will compress the spring rod 405, causing the L-shaped rod 403 to slide outward inside the mounting plate 2. The sliding of the L-shaped rod 403 can improve the stability of the positioning ring 402 moving outward. When the spring rod 405 is compressed, it can buffer the compressive force after the drill bit 3 contacts the positioning ring 402. On the other hand, when the inner side of the positioning ring 402 contacts the outer side of the drill bit 3, under the compression reaction force of the spring rod 405, the inner side of the positioning ring 402 is always in contact with the outer surface of the drill bit 3. This ensures that the positioning ring 402 can always position the axis of the drill bit 3, making it consistent with the center line of the expansion plate 503. This facilitates the subsequent movement of the expansion plate 503 to expand and clamp the drill bit 3, improving the stability of the expansion plate 503 in expanding and clamping the drill bit 3. It should be noted that since the drill bit 3 is fitted onto the surface of multiple expansion plates 503 from top to bottom, there is a gap between the outer side of the expansion plate 503 and the discharge hole inside the drill body of the drill bit 3. If the drill bit 3 shifts position during the fitting process, the multiple guide rings 504 above the expansion plate 503 will directly contact the inner wall of the discharge hole. A return spring is installed between the guide ring 504 and the expansion plate 503. When the inner wall of the discharge hole contacts the guide ring 504, the guide ring 504 will compress the return spring, thereby correcting the drill bit. Position 3 allows drill bit 3 to move downwards vertically on the surface of expansion plate 503. When drill bit 3 contacts positioning ring 402, the compressive force on the two positioning rings 402 is balanced, thereby further improving the accuracy of drill bit 3 being fitted onto the outside of expansion plate 503. This improves the stability of subsequent expansion plate 503 movement in clamping drill bit 3, effectively improving the clamping effect of drill bit 3, facilitating the processing of drill body and drill bit, and improving processing quality and efficiency.

[0024] Reference Figures 3 to 7The expansion mechanism 5 also includes a housing 501 fixedly connected to the base 1. Multiple electric expansion devices 502 are provided inside the housing 501. The output end of the electric expansion device 502 is detachably connected to the outer side of the expansion plate 503. The housing 501 is fixedly connected to the mounting plate 2.

[0025] During operation, after the drill bit 3 is vertically fitted onto the outside of multiple expansion plates 503, multiple electric expansion devices 502 are activated to drive the expansion plates 503 to move from the inside to the outside, so that the surface of the expansion plates 503 is in close contact with the inner wall of the discharge hole of the drill bit 3, thereby completing the expansion and clamping work of the drill bit 3. Furthermore, when the drill bit 3 is fitted onto the outside of multiple expansion plates 503, the inner wall of the discharge hole will first contact the outside of the guide ring 504. At this time, the discharge hole will squeeze the guide ring 504, causing the guide ring 504 to slide above the expansion plates 503. If the drill bit 3 is displaced at this time, the guide ring 504 will drive the drill bit 3 to perform state correction under the action of the return spring, so that the drill bit 3 is completely fitted onto the outside of multiple expansion plates 503 from top to bottom in a vertical state, which facilitates the subsequent clamping work of the expansion plates 503. It should be noted that when the guide ring 504 is not squeezed by the discharge hole of the drill bit 3, the guide ring 504 will extend a certain distance above the expansion plate 503 under the action of the return spring. When the drill bit 3 is fitted onto the surface of the expansion plate 503, the guide ring 504 will be squeezed and slide inward. When the drill bit 3 is misaligned, the guide ring 504 will correct the position of the drill bit 3 under the reverse force of the return spring, so that the drill bit 3 is fitted vertically from top to bottom on the outside of the expansion plate 503, thereby completing the precise installation of the drill bit 3, improving the stability of the subsequent contact between the lower part of the drill bit 3 and the upper arc surface of the positioning ring 402, allowing the positioning ring 402 to correct the position of the drill bit 3 again, improving the accuracy of the expansion plate 503 in clamping the drill bit 3, and thus improving the stability of the drill body of the drill bit 3 and the processing of the drill bit.

[0026] Reference Figures 4 to 6 The positioning mechanism 4 also includes an electric pull rod 401 fixedly connected to one side of the mounting plate 2. The output end of the electric pull rod 401 is fixedly connected to a pull plate 404. The pull plate 404 and the positioning ring 402 are slidably engaged. The output end of the electric pull rod 401 is fixedly connected to the L-shaped rod 403.

[0027] During operation, after multiple expansion plates 503 expand and clamp the discharge hole of the drill bit 3, in order to facilitate the processing of the drill body part below the drill bit 3, the electric pull rod 401 is activated to drive the pull plate 404 to move away from the center line of the expansion plate 503 inside the positioning ring 402. At this time, the pull plate 404 will move a certain distance inside the positioning ring 402 before driving the positioning ring 402 to slide outward on the upper side of the mounting plate 2, so that the positioning ring 402 is away from the surface of the drill bit 3, which makes it convenient to process the part of the drill body below the drill bit 3. It should be noted that by opening a pulling cavity inside the positioning ring 402, when the lower part of the drill bit 3 contacts and presses against the upper arc surface of the positioning ring 402, the positioning ring 402 will slide outward under the pressure of the drill bit 3's own weight. Under the reverse force of the spring rod 405, the inner side of the positioning ring 402 will always be in contact with the drill body surface of the drill bit 3, thus correcting the position of the drill bit 3. At this time, the pulling cavity of the positioning ring 402 will not contact the pull plate 404. When the electric pull rod 401 starts and drives the pull plate 404 to slide inside the pulling cavity, the pull plate 404 will slide a certain distance before pulling the positioning ring 402 away from the lower drill body surface of the drill bit 3. This can improve the stability of the movement of the positioning ring 402 and provide a processing environment for the drill body part of the drill bit 3, thereby improving the processing effect of the drill bit 3.

[0028] Reference Figures 4 to 6 A partition 406 is detachably connected to the lower part of the L-shaped rod 403. The partition 406 is tapered on the side near the expansion plate 503. Contact rods 407 slide in contact on both sides of the partition 406. One end of the contact rod 407 is electrically connected to the electric expansion device 502.

[0029] During operation, when the electric pull rod 401 drives the pull plate 404 to pull the positioning ring 402 to a position away from the expansion plate 503, the electric pull rod 401 will also drive the L-shaped rod 403 to slide outward inside the mounting plate 2. The sliding of the L-shaped rod 403 will drive the partition plate 406 to move. At this time, the contact rods 407 on the surface of each electric expander 502 will contact each other, thereby activating the electric expander 502 to drive the expansion plate 503 to move from the inside to the outside, thereby expanding and clamping the drill bit 3. It should be noted that when the drill bit 3 presses the positioning ring 402 outward from top to bottom, the pull plate 404 will be positioned close to the center line of the expansion plate 503 after the positioning ring 402 moves. When the electric pull rod 401 moves outward without pulling the positioning ring 402 outward, the positioning ring 402 will drive the L-shaped rod 403 to move through the spring rod 405. At this time, the L-shaped rod 403 will drive the partition plate 406 to move, so that the contact rods 407 on both sides of the partition plate 406 will contact each other, thereby activating the electric expander 502 to drive the expansion plate 503 to perform expansion work. When the electric pull rod 401 drives the pull plate 404 to pull the positioning ring 402 to move, it will continue to make the two contact rods 407 no longer contact each other, so that the expansion plate 503 can continue to expand the drill bit 3 until the drill bit 3 is completely positioned and clamped.

[0030] Reference Figures 8 to 11 Below the expansion plate 503, there is an auxiliary mechanism 6 for improving its expansion clamping stability. The auxiliary mechanism 6 includes a pressure ring 601 that is slidably connected to the mounting plate 2. Below the pressure ring 601, there is a swing plate 603 that is rotatably connected to the base 1. One end of the swing plate 603 is rotatably connected to a ring sleeve via a pin, and a top rod 604 is fixedly connected above the ring sleeve. The top rod 604 is tapered, and multiple top posts 606 are slidably contacted on the surface of the top rod 604. One end of the top post 606 is fixedly connected to a wedge plate 605.

[0031] The present invention also considers that when multiple expansion plates 503 expand and clamp the drill bit 3 from the inside out, there will be a large number of gaps between the multiple expansion plates 503. In order to avoid the expansion and clamping of the drill bit 3 being unstable due to vibration and other factors during the processing, which may affect the processing stability of the drill bit 3, multiple wedge plates 605 are set on the inner side of the multiple expansion plates 503. When the drill bit 3 moves downward on the arc surface above the positioning ring 402 and no longer contacts the arc surface above the positioning ring 402, the drill bit 3 will move downward under its own gravity until it falls onto the surface of the pressure ring 601. When the drill bit 3 contacts the pressure ring 601, the pressure ring 601 will move downward. The downward movement of the pressure ring 601 will drive the swing plate 603 to swing. The swing plate 603 will push the ring sleeve to move upward. The upward movement of the ring sleeve will drive the push rod 604 to move upward. The upward movement of the push rod 604 will squeeze multiple push columns 606 through the conical surface to move away from the axis of the expansion plate 503. At this time, the push column 606 will drive multiple wedge plates 605 to move to the position where there is a gap between the two expansion plates 503, until one side of the wedge plate 605 contacts the inner side of the expansion plate 503, thereby supporting and limiting the expansion plate 503, and thus improving the stability of the expansion plate 503. It should be noted that, since the push rod 604 is tapered and the length of the push column 606 is varied, when the push rod 604 moves upward, it will push the wedge plate 605 outward by relying on the inclined surface, thereby filling the gap generated after the expansion plate 503 expands, thus improving the stability of the drill bit 3 after the expansion plate 503 expands and clamps it. Therefore, it can effectively avoid the instability of the drill bit 3 due to vibration and other factors during the processing after the expansion plate 503 expands and clamps it, thereby improving the stability of the drill bit 3 during processing.

[0032] Reference Figures 8 to 10 Multiple sliding rods 602 are fixedly connected to the lower part of the pressure ring 601. The sliding rods 602 are slidably connected to the outer shell 501. The lower part of the sliding rods 602 is in slidable contact with the surface of the swing plate 603. The top rod 604 and the ring sleeve are slidably connected to the outer shell 501.

[0033] During operation, when the bottom of the drill bit 3 contacts the pressure ring 601, the downward movement of the pressure ring 601 will drive the sliding rod 602 to move downward. The downward movement of the sliding rod 602 will drive the swing plate 603 to swing around the pin inside the housing 501. The swing of the swing plate 603 will push the ring sleeve to move upward, thereby driving the push rod 604 to move upward between the expansion plates 503. This allows the wedge plate 605 to adjust the gap created after the expansion plates 503 are expanded, thereby improving the stability of the expansion plates 503 during expansion. It should be noted that by setting the pin position on the surface of the swing plate 603 close to the sliding rod 602, when the sliding rod 602 moves downward to push the swing plate 603 to swing around the pin, the swing plate 603 can better drive the ring sleeve to move upward, thereby improving the stability of the push rod 604 sliding upward inside the outer shell 501, making the wedge plate 605 and the expansion plate 503 fit tightly together, and improving the stability of the expansion plate 503 in expanding and clamping the drill bit 3.

[0034] Reference Figure 11 The surface of the mounting plate 2 is provided with a sliding groove, and the sliding groove is set in a wedge shape away from the center line of the expansion plate 503. The lower part of the L-shaped rod 403 is set in a wedge shape, and an elastic washer is set on the upper arc surface of the L-shaped rod 403.

[0035] During operation, to prevent the positioning ring 402 from moving excessively outward due to the weight of the drill bit 3 after contact between the lower part of the drill bit 3 and the upper arc surface of the positioning ring 402, which could cause the pull plate 404 to directly contact the pull cavity inside the positioning ring 402 and damage the electric pull rod 401, the mounting plate 2 is wedge-shaped away from the expansion plate 503. When the positioning ring 402 moves outward due to the weight of the drill bit 3, it will push the L-shaped rod 403 outward via the spring rod 405. Furthermore, the lower part of the L-shaped rod 403 is wedge-shaped. When the L-shaped rod 403 reaches the wedge-shaped position of the groove, it will no longer be subjected to the squeezing force of the positioning ring 402 and the spring rod 405 and continue to move (e.g., Figure 11 As shown), when the subsequent electric pull rod 401 drives the positioning ring 402 to move outward through the pull plate 404, the L-shaped rod 403 will cooperate with the wedge position of the slide groove, thus continuing to move. At this time, the slide groove opened on the surface of the mounting plate 2 can limit the movement of the L-shaped rod 403 to a certain extent, effectively protecting the output end of the electric pull rod 401 and limiting the movement range of the positioning ring 402, so that the inner side of the positioning ring 402 can always be in close contact with the drill body position below the drill bit 3, thereby improving the accuracy of the positioning of the drill bit 3. It should be noted that when the wedge-shaped position below the L-shaped rod 403 engages with the groove on the surface of the mounting plate 2 and stops moving, even if the positioning ring 402 continues to move, it will continue to compress the spring rod 405, making the reverse force of the spring rod 405 greater. This makes the inner side of the positioning ring 402 fit more tightly against the outer surface of the drill bit 3, improving the accuracy and stability of the positioning ring 402 in positioning the drill bit 3, and thus improving the stability of the subsequent expansion plate 503 in expanding it.

[0036] Reference Figures 9 to 11 A compression spring is provided at the sliding position of the pressure ring 601 and the mounting plate 2. The inner diameter of the pressure ring 601 is larger than the diameter of the expansion plate 503 after it is fully expanded. The lower end of the wedge plate 605 is slidably connected to the base 1.

[0037] During operation, after the drill bit 3 slides off the surface of the positioning ring 402, the drill bit 3 will press down on the pressure ring 601 by its own weight. After the drill bit 3 finishes processing, the pressure ring 601 loses the downward pressure of the drill bit 3. At this time, the pressure ring 601 resets under the force of the compression spring, so that one end of the sliding rod 602 below the pressure ring 601 no longer contacts the surface of the swing plate 603. This causes the top rod 604 above the swing plate 603 to reset, so that the conical surface of the top rod 604 no longer presses against the top column 606. At this time, the wedge plate 605 no longer fills the gap between the expansion plates 503, which facilitates the subsequent reset of the expansion plates 503 and completes the expansion and clamping work of the drill bit 3. It should be noted that when the electric expander 502 drives the expander plate 503 to move, and when the push rod 604 drives the wedge plate 605 at one end of the push column 606 to move through the conical surface, the lower surfaces of the expander plate 503 and the wedge plate 605 will slide on the inner surface of the base 1. This can effectively improve the stability of the movement of the expander plate 503 and the wedge plate 605. Furthermore, since the inner diameter of the pressure ring 601 is larger than the diameter of the expander plate 503 after it is fully expanded, even when the expander plate 503 expands and clamps the drill bit 3, the expander plate 503 will not contact the pressure ring 601. This can further improve the safety of the expander plate 503 in expanding and clamping, and avoid damage to it.

[0038] Reference Figures 8 to 11 A spring pad is provided above the top rod 604. The height of the top rod 604 is lower than the height of the guide ring 504. The sliding rod 602 is also slidably connected to the outer casing 501.

[0039] During operation, when the push rod 604 is pushed upward by multiple swing plates 603 through the ring, in order to avoid damage caused by the push rod 604 contacting the inner wall of the drill bit 3 discharge hole, a spring pad is set above the push rod 604. On the one hand, this can prevent the push rod 604 from scratching the discharge hole inside the drill bit 3 after moving upward, and on the other hand, it can improve the contact stability between the push rod 604 and the discharge hole, so that the conical surface of the push rod 604 can stably push the wedge plate 605 at one end of the push column 606 to contact the expansion plate 503, thereby improving the stability of the expansion plate 503 and making the expansion and clamping stability of the expansion plate 503 better. Furthermore, by setting the height of the push rod 604 to be lower than the height of the guide ring 504, when the push rod 604 moves upward, it will only contact the guide ring 504 through the spring pad, thereby further improving the stability of the contact between the push rod 604 and the drill bit 3 and protecting the discharge hole opened inside the drill bit 3.

[0040] Reference Figures 1 to 6 The spring rod 405 is located inside the groove opened on the surface of the mounting plate 2. The partition 406 below the positioning ring 402 is slidably connected to the mounting plate 2. The partition 406 is made of insulating material, and the expansion plate 503 is made of high-strength material.

[0041] During operation, when the positioning ring 402 moves outward under the weight of the drill bit 3, the positioning ring 402 will drive the spring rod 405 to slide in the groove inside the mounting plate 2. At this time, the partition 406 driven by the positioning ring 402 will lose its isolation effect on the two contact rods 407, making the two contact rods 407 electrically connected. This causes the electric expander 502 to drive the expander plate 503 to expand and clamp the drill bit 3. Furthermore, by using insulating material for the partition plate 406 and high-strength material for the expansion plate 503, the stability of the electric expansion device 502 can be improved, thereby enabling multiple expansion plates 503 to stably and synchronously expand the drill bit 3. On the other hand, the service life of the expansion plate 503 can be increased, and the expansion effect of the expansion plate 503 on the drill bit 3 can be improved.

[0042] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0043] 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 crown drill inner hole expansion clamp comprising a base (1), characterized in that: The inside of the base (1) is provided with a mounting plate (2), the upper side of the mounting plate (2) is provided with a drill bit (3), the lower side of the mounting plate (2) is provided with a splaying mechanism (5) for splaying and clamping the drill bit (3), the upper side of the mounting plate (2) is provided with a positioning mechanism (4) for adjusting the clamping reference of the drill bit (3). The splaying mechanism (5) comprises a plurality of movable splaying splaying plates (503), the upper side of the splaying plate (503) is slidably connected with a guide ring (504), the positioning mechanism (4) comprises a positioning ring (402), and the upper side of the positioning ring (402) is provided in an arc surface, one side of the positioning ring (402) is fixedly connected with a spring rod (405), one side of the spring rod (405) is fixedly connected with an L-shaped rod (403), and the L-shaped rod (403) is slidably connected with the mounting plate (2).

2. A crown drill inner hole expander clamp according to claim 1, characterized in that: The splaying mechanism (5) further comprises an outer shell (501) fixedly connected with the base (1), the inside of the outer shell (501) is provided with a plurality of electric splaying devices (502), the output end of the electric splaying device (502) is detachably connected with the outer side of the splaying plate (503), and the outer shell (501) is fixedly connected with the mounting plate (2).

3. A crown drill inner hole expander clamp according to claim 1, characterized in that: The positioning mechanism (4) further comprises an electric pull rod (401) fixedly connected on one side of the mounting plate (2), the output end of the electric pull rod (401) is fixedly connected with a pull plate (404), the pull plate (404) is slidably connected with the positioning ring (402), and the output end of the electric pull rod (401) is fixedly connected with the L-shaped rod (403).

4. A crown drill inner hole expander clamp according to claim 3, characterized in that: The lower side of the L-shaped rod (403) is detachably connected with a partition plate (406), the partition plate (406) is provided in a conical shape near one side of the splaying plate (503), the two sides of the partition plate (406) are slidably connected with contact rods (407), and one end of the contact rod (407) is electrically connected with the electric splaying device (502).

5. A crown bit hole expander clamp as defined in claim 1 wherein: The lower side of the splaying plate (503) is provided with an auxiliary mechanism (6) for improving the splaying and clamping stability thereof, the auxiliary mechanism (6) comprises a pressing ring (601) slidably connected with the mounting plate (2), the lower side of the pressing ring (601) is rotatably connected with a swing plate (603) of the base (1), one end of the swing plate (603) is rotatably connected with a ring sleeve through a pin shaft, a top rod (604) is fixedly connected above the ring sleeve, the top rod (604) is provided in a conical shape, a plurality of jacks (606) are slidably connected on the surface of the top rod (604), and one end of the jack (606) is fixedly connected with a wedge-shaped plate (605).

6. A crown drill inner hole expander clamp according to claim 5, characterized in that: A plurality of sliding rods (602) are fixedly connected below the pressing ring (601), the sliding rods (602) are slidably connected with the outer shell (501), the lower side of the sliding rod (602) is slidably connected with the surface of the swing plate (603), and the top rod (604) and the ring sleeve are slidably connected with the outer shell (501).

7. A crown drill inner hole expander clamp according to claim 1, characterized in that: The surface of the mounting plate (2) is provided with a sliding groove, and the position of the sliding groove away from the center line of the expansion plate (503) is wedge-shaped, the lower part of the L-shaped rod (403) is wedge-shaped, and the upper arc surface of the L-shaped rod (403) is provided with an elastic washer.

8. A crown drill inner hole expander clamp according to claim 6, characterized in that: The sliding position of the compression ring (601) and the mounting plate (2) is provided with a compression spring, the inner diameter of the compression ring (601) is greater than the diameter of the expansion plate (503) after being fully expanded, and the lower end of the wedge-shaped plate (605) and the base (1) are slidingly connected.

9. A crown drill inner hole expander clamp according to claim 8, characterized in that: The upper part of the ejector rod (604) is provided with a spring pad, the height of the ejector rod (604) is lower than the height of the guide ring (504), and the sliding rod (602) and the shell (501) are also slidingly connected.

10. A crown drill inner hole expander clamp according to claim 1, characterized in that: The spring rod (405) is located in the sliding groove on the surface of the mounting plate (2), the partition plate (406) below the positioning ring (402) and the mounting plate (2) are slidingly connected, the partition plate (406) is made of insulating material, and the expansion plate (503) is made of high-strength material.

Images