A square hole drilling machine
By using a cage concentrically set with the spindle in the square hole drilling rig, and utilizing the meshing of the internal gear ring with the external gear of the cutter barrel to achieve rotation and revolution coupling, the wear problem of the Leylow triangle block is solved, the machining accuracy and reliability are improved, and energy consumption is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TAIZHOU JIYU TRADING CO LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-19
AI Technical Summary
In existing square hole drilling machines, the Leylow triangular block and the guide frame are prone to wear, which leads to increased drilling accuracy and energy consumption, as well as high frictional resistance, affecting processing quality and reliability.
The cage is set concentrically with the spindle, and the tool barrel is located eccentrically on the cage. The rotation and revolution coupling are achieved by the meshing of the internal gear ring with the external gear of the tool barrel, which reduces the axial load on the spindle and uses the cage to transmit thrust, avoiding the frictional engagement between the Leylow triangle block and the guide block.
It improves the quality of hole opening and machining accuracy, reduces energy consumption, enhances the stability and long-term reliability of the spindle, and reduces wear and frictional resistance.
Smart Images
Figure CN121820734B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of power tools and machine tools technology, and relates to a square hole drilling machine. Background Technology
[0002] A square hole drill is an electric tool used to drill square holes in various materials. It is widely used in furniture manufacturing, construction and decoration, and machining. Square hole drills currently generally employ the Reilly triangle principle to achieve square hole machining. This involves driving a Reilly triangle-shaped cutter head to rotate and revolve at a set speed, thus creating a square hole.
[0003] The square hole drilling machine disclosed in the patent document (application number: 201611020828.9) includes a housing, a guide frame fixed inside the housing, a Reuleaux triangle block inside the guide frame, a hollow square hole milling cutter at the lower end of the Reuleaux triangle block, a drive rod rotatably connected to the middle of the housing, the drive rod passing through the Reuleaux triangle block and the square hole milling cutter, and a centering head fixed at the protruding end, a pinion concentrically arranged in the middle of the drive rod, the Reuleaux triangle block having an internal gear, the pinion meshing with the internal gear, when the drive rod rotates, the pinion drives the Reuleaux triangle block to rotate and revolve through the internal gear. Since the Reuleaux triangle block is located inside the guide frame, the revolution trajectory is constrained by the guide frame, so that the rotation and revolution of the square hole milling cutter are coupled to open a square hole. The square hole end mill in this comparative document achieves its rotation and revolution through the meshing of a pinion and an internal gear. The driving force for both rotation and revolution is transmitted to the internal gear via the pinion, resulting in heavy loads and easy wear on both gears. In particular, the revolution of the square hole end mill relies on the guide frame to guide and constrain the Reuleaux triangle block. This leads to easy wear between the Reuleaux triangle block and the guide frame, affecting the hole-opening accuracy. Furthermore, the friction between them creates resistance to the rotation of the square hole end mill, increasing energy consumption. Moreover, during the hole-opening process, the square hole end mill needs to be pushed forward. The reaction force on the square hole end mill presses it against the inner end face of the housing through the Reuleaux triangle block. Since the Reuleaux triangle block is rotating and wobbling, it generates significant friction and wear with the housing, affecting the hole-opening quality and increasing energy consumption. Summary of the Invention
[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a square hole drilling machine that can improve long-term reliability and ensure hole quality.
[0005] The objective of this invention can be achieved through the following technical solution: A square hole drilling machine includes a housing, a cutter barrel inserted inside the housing, and a main shaft passing through the cutter barrel and rotatably connected to the housing. The front end of the cutter barrel extends out of the housing and is fixed with a square hole cutting head. The front end of the main shaft extends out of the cutter barrel and is fixed with a centering head. The machine is characterized in that a retainer is rotatably connected inside the housing, the retainer being concentrically arranged with the main shaft. The cutter barrel is axially positioned on the retainer and located at an eccentric position on the retainer. The main shaft drives the retainer or the cutter barrel to rotate through a transmission structure, causing the cutter barrel to revolve around the main shaft. An internal gear ring is also fixed inside the housing, the internal gear ring surrounding the cutter barrel and being concentric with the main shaft. The cutter barrel is rotatably connected to the retainer, and the outer wall of the cutter barrel has external teeth in the circumferential direction that mesh with the internal gear ring.
[0006] The Leylow cutter head is a type of cutter head designed using the characteristics of the Leylow triangle. When the Leylow cutter head couples its revolution and rotation in a set manner, it can machine square holes, which is also the most common cutter head for machining square holes. The square hole cutting head of this square hole drilling machine is a Leroy cutting head. Utilizing the principle of Leroy cutting heads for square hole machining, it ensures the stability and reliability of the Leroy cutting head's rotation and revolution. During use, the square hole drilling machine is mounted on a power tool such as an electric hammer, electric drill, drilling machine, or milling machine. The machine housing is connected to the power tool's housing, and the power tool's drive shaft is connected to the spindle, driving the spindle's rotation. The centering head at the front of the spindle can be a drill bit with cutting function or a round head with only positioning function. The former can directly machine positioning holes on the object, while the latter requires pre-machining positioning holes on the object, and then the centering head is inserted into the positioning holes for positioning. Therefore, during machining, the centering head is first drilled or inserted into the object for center positioning, preventing the square hole cutting head from wobbling or tilting on the object due to revolution, ensuring the quality of the hole opening. The user does not need to apply force for centering; only a forward thrust and anti-torsion force are required, making operation more labor-saving and convenient. Since the cage is concentrically set with the spindle, and the tool barrel is located eccentrically with respect to the spindle, when the spindle rotates and drives the cage to rotate through the transmission structure, the tool barrel on the cage will revolve around the spindle. An internal gear ring is fixed inside the housing, which can also be an integral structure with the housing. When the tool barrel revolves, it rotates because the external teeth on its outer wall mesh with the internal gear ring fixed inside the housing. The ratio of the number of teeth of the external teeth of the tool barrel to the number of teeth of the internal gear ring is 3:4. Therefore, the rotation and revolution of the square hole cutting head are coupled to open a square hole in the object. The square hole cutting head requires both forward thrust and circumferential torque for cutting during the hole-making process. This application provides a retainer that is rotatably connected to the housing, while the cutter barrel is axially positioned on the retainer. Therefore, during hole-making, the power tool applies a forward thrust, the housing of the power tool pushes the housing forward, and the housing pushes the cutter barrel forward through the retainer, thus advancing the square hole cutting head forward. In other words, the retainer transfers the thrust from the housing to the cutter barrel, while the spindle only needs to bear the force of the centering head drilling, greatly reducing the axial load on the spindle and ensuring its stability and reliability. Correspondingly, because the spindle drives the tool barrel to revolve through the cage, the external teeth of the tool barrel only need to mesh with the internal gear ring to drive the tool barrel to rotate. The load is relatively small, reducing mutual wear and ensuring machining accuracy and long-term reliability. In particular, when the cage drives the tool barrel to revolve, the external teeth of the tool barrel mesh with the internal gear ring to generate rotation. Therefore, there is no need for the Reilly triangle block and guide block to cooperate for trajectory guidance, reducing frictional resistance and wear, which reduces energy consumption and ensures long-term reliability.
[0007] In the aforementioned square hole drilling rig, a mounting hole is provided through the cage along the axial direction of the main shaft. This mounting hole is eccentrically positioned with respect to the main shaft. Both the cutter barrel and the main shaft pass through the mounting hole, and the cutter barrel is rotatably connected within the mounting hole of the cage. The mounting hole facilitates the passage of the main shaft, while the cutter barrel passing through the mounting hole provides greater stability and reliability when the cage pushes the cutter barrel to revolve.
[0008] In the aforementioned square hole drilling rig, the retainer comprises two disc-shaped discs, spaced apart and rotatably connected within the housing. The two discs are circumferentially fixed and concentrically positioned with the main shaft. The internal gear ring is located between the two discs, and mounting holes are provided on both discs. The rear end of the cutter barrel passes through these mounting holes and is rotatably connected to the two discs. The rotation of the two discs drives the cutter barrel to revolve around the internal gear ring. The engagement of the outer teeth of the cutter barrel with the internal gear ring causes the cutter barrel to rotate. The retainer's two-disc structure provides two-point axial support for the cutter barrel. The internal gear ring's position between the two discs ensures that the force exerted by the internal gear ring on the cutter barrel is distributed between the support points of the two discs. Therefore, the force on the cutter barrel is more symmetrical, resulting in better rigidity and a more stable and reliable structure. Furthermore, concealing the internal gear ring between the two discs reduces the entry of dust particles between the internal gear ring and the outer teeth, leading to smoother operation and higher reliability.
[0009] In the aforementioned square hole drilling rig, both of the two disc bodies have relatively protruding connecting protrusions on their opposite sides. The outer teeth on one side of the cutter barrel mesh with the inner gear ring, while there is a clearance gap between the outer teeth on the other side and the inner gear ring. The two connecting protrusions extend into the clearance gap and are circumferentially positioned by interlocking with each other in the front-back direction using a key with concave and convex joints. This structure cleverly utilizes the engagement of the outer teeth and the inner gear ring after the cutter barrel is offset, creating a clearance gap between the cutter barrel and the inner gear ring. The connecting protrusions are interlocked with keyes, ensuring the reliability of circumferential positioning and facilitating the assembly of the two disc bodies.
[0010] In the aforementioned square hole drilling rig, the inner cavity of the housing extends through the entire structure. A ring-shaped positioning flange is circumferentially positioned on the inner wall of the housing. The internal gear ring is inserted and fixed inside the positioning flange. Two support sleeves are also provided inside the housing, located on the front and rear sides of the positioning flange and abutting against its end face. Two discs are embedded in the ports of the two support sleeves. A ring of external ball bearings is press-fitted between each disc and support sleeve, and both discs are pressed against the support sleeves towards the internal gear ring via the external ball bearings. The positioning flange supports the internal gear ring and the two discs. When the square hole drilling rig is working, the positioning flange pushes the cutter barrel forward through the support sleeves and discs, causing the square hole cutting head to advance. As the cutter barrel revolves, it rotates via the internal gear ring on the positioning flange for cutting. In other words, the positioning flange on the housing fixes the internal gear ring and transmits the driving force, making the entire structure more stable and reliable.
[0011] In the aforementioned square hole drilling rig, the outer edge of the front end of the internal gear ring has an annular abutment flange, and the inner edge of the front end of the positioning flange has an annular concave shoulder. The abutment flange of the internal gear ring abuts against the concave shoulder of the positioning flange. A slot is provided on the outer peripheral wall of the internal gear ring, and a through hole is provided on the side wall of the housing. A pin is fixedly inserted into the through hole and positioned in the slot. There is a gap between the two end faces of the internal gear ring and the end faces of the two discs. The positioning flange limits the internal gear ring through the concave shoulder, and then the internal gear ring is fixed in place by the pin. At the same time, there is a gap between the two discs of the cage and the internal gear ring to avoid interference with the internal gear ring and ensure the smooth rotation of the cage.
[0012] In the aforementioned square hole drilling rig, the outer wall of the cutter barrel has a circumferentially annular limiting flange. The rear end of the cutter barrel passes through the mounting holes of the two discs and is screwed with a locking sleeve. An inner ball bearing is press-fitted between the limiting flange and the front disc, and between the locking sleeve and the rear disc. When the locking sleeve is tightened, the limiting flange and the locking sleeve are pressed against the two discs in the direction of the inner gear ring by the inner ball bearing. When the locking nut is tightened, the limiting flange and the locking nut press against the two discs in the direction of the inner gear ring. The two discs press against the two support sleeves in the direction of the inner gear ring. During assembly, the inner gear ring is inserted into the positioning flange and fixed. The two support sleeves are inserted into the housing from the front and rear ends and abut against the end face of the support flange. Then, outer balls are filled into the inner wall of the two support sleeves. The two discs are then embedded into the support sleeves from the front and rear ends, and inner balls are filled into the inner side of the discs. Finally, the rear end of the cutter barrel passes through the two discs from front to back and is locked by the locking nut. At this time, the limiting flange on the cutter barrel is pressed against the front disc by the inner balls on the front side, and the locking nut is pressed against the rear disc by the inner balls on the rear side. The two discs are pressed against the two support sleeves by their respective outer balls, so that the two support sleeves press against the positioning flange. This structure is easy to assemble, and the structure has high stability and reliability after assembly.
[0013] In the aforementioned square hole drilling rig, the transmission structure includes a torque arm fixed to the rear end of the spindle and extending radially. This torque arm is fixedly connected to the eccentric position of the rear end disc via a locating pin. The spindle drives the rear end disc through the torque arm, and the rear end disc drives the front end disc to rotate synchronously via a connecting protrusion, thereby realizing the transmission of driving force, reducing energy loss, and improving structural reliability.
[0014] In the aforementioned square hole drilling rig, a rear dust cover is fixedly fitted onto the rear end of the spindle. This dust cover is embedded in the rear support sleeve and covers the rear end face of the rear disc. The aforementioned locking nut is located inside the dust cover, and the torque arm is integrally formed onto the rear end face of the rear dust cover. The rear dust cover seals the moving parts inside the housing from the rear end, ensuring smooth and reliable internal transmission. Simultaneously, integrally forming the torque arm onto the rear end face of the dust cover makes the structure more compact and improves the structural strength of the torque arm, ensuring long-term reliability.
[0015] In the aforementioned square hole drilling rig, the transmission structure includes a transmission gear fixed to the rear end of the spindle, and a transmission gear sleeve fixed to the rear end of the cutter barrel. The transmission gear is located inside the transmission gear sleeve and meshes with it. When the transmission gear rotates, it drives the transmission gear sleeve to revolve around the transmission gear, thereby driving the cutter barrel to rotate and revolve, and the cutter barrel pushes the retainer to rotate.
[0016] Compared with existing technologies, this square hole drilling rig has the following advantages:
[0017] 1. During hole drilling, the power tool applies a forward thrust, and the power tool housing pushes the square hole drill housing forward. The housing pushes the tool barrel forward through the cage, thus advancing the square hole cutting head. In other words, the cage transfers the thrust of the housing to the tool barrel, while the spindle only needs to bear the force of the centering head drilling, which greatly reduces the axial load on the spindle and ensures the stability and reliability of the spindle.
[0018] 2. Since the spindle drives the cage to rotate the tool barrel, the external gear of the tool barrel only needs to mesh with the internal gear ring to drive the tool barrel to rotate. The load is relatively small, reducing mutual wear and ensuring machining accuracy and long-term reliability.
[0019] 3. Since the cage drives the tool barrel to revolve and the internal gear ring drives the tool barrel to rotate, there is no need for the Reilly triangle block and guide block to cooperate for trajectory guidance, which reduces frictional resistance and wear, thereby reducing energy consumption and ensuring long-term reliability.
[0020] 4. Because the cage includes two discs, the cutter barrel is supported at two points in the axial direction. The internal gear ring is located between the two discs, so the force exerted by the internal gear ring on the cutter barrel is located between the support points of the two discs. Therefore, the force on the cutter barrel is more symmetrical, and the structure is more stable and reliable.
[0021] 5. Since the torque arm is integrally molded on the rear end face of the rear dust cover, the structure is more compact, and the structural strength of the torque arm is improved by the rear dust cover, ensuring the reliability of long-term use. Attached Figure Description
[0022] Figure 1This is a three-dimensional structural diagram of a square hole drilling rig.
[0023] Figure 2 This is a front view of the structure of a square hole drilling rig.
[0024] Figure 3 yes Figure 2 Longitudinal structural cross-sectional view at point AA.
[0025] Figure 4 This is a cross-sectional view of the transverse structure at the internal gear ring of a square hole drilling rig.
[0026] Figure 5 yes Figure 2 A longitudinal partial structural cross-sectional view at point BB.
[0027] Figure 6 It is an exploded view of the structure of components such as the cage.
[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the cage.
[0029] Figure 8 This is a three-dimensional structural diagram of the rear dust cover.
[0030] Figure 9 This is a structural cross-sectional view of the square hole drilling machine in Embodiment 2.
[0031] In the diagram, 1. Housing; 11. Positioning flange; 111. Shoulder; 112. Annular groove; 12. Through hole; 2. Tool barrel; 21. Square hole cutting head; 22. External gear; 23. Limiting flange; 3. Spindle; 31. Centering head; 4. Cage; 41. Disc; 411. Mounting hole; 412. Connecting protrusion; 413. Groove II; 414. Positioning hole; 42. Internal ball bearing; 5. Internal gear ring; 51. Abutment flange; 52. Slot; 53. Pin; 54. Clearance clearance; 6. Support sleeve; 61. Groove I; 62. External ball bearing; 7. Transmission structure; 71. Torque arm; 711. Pin hole; 712. Positioning pin; 72. Rear dust cover; 73. Transmission gear; 74. Transmission gear sleeve; 8. Locking nut sleeve; 9. Front dust cover; 10. Bearing. Detailed Implementation
[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0033] Example 1:
[0034] like Figure 1 , Figure 3As shown, a square hole drilling rig includes a housing 1, a spindle 3, and a cutter barrel 2. The housing 1 has a through-cavity with a circular cross-section. The cutter barrel 2 is inserted into the housing 1, with its front end extending out of the housing 1 and fixed with a square hole cutting head 21. The spindle 3 is inserted into the cutter barrel 2, with its front end passing through the square hole cutting head 21, extending out of the cutter barrel 2, and fixed with a centering head 31. Figure 2 As shown, the square hole cutting head 21 includes a cutter head with an outer contour in the shape of a Reichstag triangle. The cutter head has three rounded edges and three sharp corners. At least three circumferentially distributed cutting blades are fixed on the front face of the cutter head, and the ends of the three cutting blades extend to the three sharp corners respectively. Figure 3 As shown, a support sleeve 6 is fixed inside the housing 1 or integrally formed with the housing 1. A retainer 4 is rotatably connected inside the support sleeve 6. A mounting hole 411 is provided through the retainer 4 in the front-rear direction. The rear end of the tool barrel 2 passes through the mounting hole 411 and is rotatably connected to the retainer 4. The rear end of the spindle 3 passes through the tool barrel 2 and is rotatably connected to the housing 1 through a bearing 10. The rear end of the spindle 3 also drives the retainer 4 to rotate through a transmission structure 7. The support sleeve 6, retainer 4, and spindle 3 are concentrically arranged. The mounting hole 411 is located at an eccentric position on the retainer 4. Therefore, the mounting hole 411 is eccentrically arranged with the spindle 3, that is, the tool barrel 2 and the spindle 3 are eccentrically arranged. Figure 4 As shown, an internal gear ring 5 is also fixed inside the housing 1. The internal gear ring 5 and the housing 1 can be a separate structure or an integrated structure. The internal gear ring 5 is arranged around the cutter barrel 2 and is concentric with the main shaft 3. The outer wall of the cutter barrel 2 has external teeth 22 in the circumferential direction. The cutter barrel 2 is eccentric to the internal gear ring 5 and the external teeth 22 on one side mesh with one side of the internal gear ring 5. There is a clearance 54 between the external teeth 22 on the other side of the cutter barrel 2 and the internal gear ring 5. The ratio of the number of teeth of the external teeth 22 of the cutter barrel 2 to the number of teeth of the internal gear ring 5 is 3:4.
[0035] Specifically, combined Figure 4 , Figure 5 As shown, the inner wall of the housing 1 has a circumferentially annular positioning protrusion 11. The inner edge of the front end of the positioning protrusion 11 has a circumferentially annular concave shoulder 111. The outer edge of the front end of the internal gear ring 5 has a circumferentially annular abutting protrusion 51. The internal gear ring 5 is inserted into the inner side of the positioning protrusion 11 with the rearward facing, and the abutting protrusion 51 of the internal gear ring 5 abuts against the concave shoulder 111 of the positioning protrusion 11. A slot 52 is provided on the outer peripheral wall of the internal gear ring 5. A through hole 12 is provided through the side wall of the housing 1. A pin 53, which is fixedly inserted into the slot 52, is fixedly inserted into the through hole 12. Both end faces of the positioning protrusion 11 have circumferentially annular grooves 112. There are two support sleeves 6. The two support sleeves 6 are located on the front and rear sides of the positioning protrusion 11 and abut against the annular grooves 112 of the positioning protrusion 11. The inner wall of the support sleeve 6 has a circumferentially annular groove 61. A ring of outer balls 62 is filled in the groove 61. Figure 5 , Figure 6, Figure 7 As shown, the cage 4 includes two disc-shaped discs 41. The two discs 41 are respectively inserted into the ports of the two support sleeves 6 from both ends, so that the internal gear ring 5 is located between the two discs 41. The discs 41 press against the outer ball 62 in the direction of the internal gear ring 5. There is a gap between the end faces of the two ends of the internal gear ring 5 and the end faces of the two discs 41. Mounting holes 411 are provided on both discs 41. The mounting holes 411 of the discs 41 have annular grooves 413 on the circumferential direction. A ring of inner balls 42 is filled in the grooves 413. The outer wall of the cutter cylinder 2 has annular limiting flanges 23 on the circumferential direction. The rear end of the cutter cylinder 2 passes through the mounting holes 411 of the two discs 41 and is screwed with a locking sleeve 8. When the locking sleeve 8 is locked, the limiting flanges 23 and the locking sleeve 8 press against the inner balls 42 in the direction of the inner gear ring 5. That is, the limiting flanges 23 and the locking sleeve 8 are pressed against the two discs 41 in the direction of the inner gear ring 5 through the inner balls 42. The two discs 41 are pressed against the two support sleeves 6 in the direction of the inner gear ring 5 through the outer balls 62. The two support sleeves 6 are pressed against the positioning flanges 11.
[0036] Two discs 41 are spaced apart and concentrically positioned with the spindle 3. The mounting hole 411 is located at an eccentric position on the disc 41. Each of the two discs 41 has a relatively protruding connecting protrusion 412 on its opposite side. The connecting protrusion 412 is strip-shaped along the circumference of the disc 41. The inner side of the connecting protrusion 412 is an arc surface and is coplanar with the wall of the mounting hole 411. Each of the connecting protrusions 412 has a concave keyway and a protruding key block on its end face. The two connecting protrusions 412 extend into the clearance 54 between the internal gear ring 5 and the tool barrel 2. The keyways and key blocks of the two connecting protrusions 412 are interlocked for circumferential positioning. A connecting pin can also be inserted between the two connecting protrusions 412 for circumferential positioning. A front dust cover 9 is fixed to the front surface of the front disc 41. This front dust cover 9 covers the outer end of the front support sleeve 6. A rear dust cover 72 is fixedly fitted to the rear end of the spindle 3. This rear dust cover 72 is embedded in the rear support sleeve 6 and covers the rear end surface of the rear disc 41. A locking screw 8 is located inside the dust cover. Figure 3 , Figure 8 As shown, the transmission structure 7 includes a torque arm 71 integrally formed on the rear end face of the dust cover. The torque arm 71 is block-shaped, and its inner end is fixed on the main shaft 3 together with the rear dust cover 72. The outer end is provided with a pin hole 711 along the axial direction of the main shaft 3. The pin hole 711 passes through the rear dust cover 72, and a positioning pin 712 passes through the pin hole 711. A positioning hole 414 is provided at the eccentric position of the rear disc 41. The positioning pin 712 is inserted and positioned in the positioning hole 414. The outer end of the torque arm 71 and the rear disc 41 are also locked and fixed by screws.
[0037] During hole drilling, the housing 1 is mounted on the electric motor. The drive shaft of the electric motor is connected to the spindle 3, which can drive the spindle 3 to rotate. The centering head 31 at the front end of the spindle 3 first drills into the object for center positioning. The spindle 3 also drives the cage 4 to rotate through the torque arm 71. The cage 4 pushes the tool barrel 2 to revolve relative to the spindle 3. At the same time, the tool barrel 2 rotates under the transmission of the external gear 22 and the internal gear ring 5, realizing the coupling of the rotation and revolution of the square hole cutting head 21 to process the square hole.
[0038] Example 2:
[0039] The structure of this square hole drilling rig is basically the same as that of Embodiment 1, the difference being that... Figure 9 As shown, the transmission structure 7 includes a transmission gear 73 fixed to the rear end of the main shaft 3, and a transmission sleeve 74 fixed to the rear end of the tool barrel 2. The transmission gear 73 is located at an eccentric position inside the transmission sleeve 74 and meshes with the transmission sleeve 74.
[0040] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.
[0041] Although this document frequently uses terms such as housing 1, positioning flange 11, and concave shoulder 111, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.
Claims
1. A square hole drilling machine, comprising a housing (1), a cutter barrel (2) passing through the housing (1), and a spindle (3) passing through the cutter barrel (2) and rotatably connected to the housing (1), wherein the front end of the cutter barrel (2) extends out of the housing (1) and is fixed with a square hole cutting head (21), and the front end of the spindle (3) extends out of the cutter barrel (2) and is fixed with a centering head (31), characterized in that, A retainer (4) is rotatably connected inside the housing (1). The retainer (4) is concentrically arranged with the main shaft (3). The cutter barrel (2) is axially positioned on the retainer (4) and located at an eccentric position of the retainer (4). The main shaft (3) drives the retainer (4) or the cutter barrel (2) to rotate through the transmission structure (7), causing the cutter barrel (2) to revolve around the main shaft (3). An internal gear ring (5) is also fixed inside the housing (1). The internal gear ring (5) is arranged around the cutter barrel (2) and is concentric with the main shaft (3). The cutter barrel (2) is rotatably connected with the retainer (4), and the outer wall of the cutter barrel (2) has external teeth (22) that mesh with the internal gear ring (5) in the circumferential direction.
2. The square hole drilling machine according to claim 1, characterized in that, The retainer (4) has a mounting hole (411) extending through the main shaft (3) axially. The mounting hole (411) is eccentrically set with respect to the main shaft (3). The tool barrel (2) and the main shaft (3) both pass through the mounting hole (411), and the tool barrel (2) is rotatably connected in the mounting hole (411) of the retainer (4).
3. The square hole drilling machine according to claim 2, characterized in that, The retainer (4) includes two disc-shaped discs (41), which are spaced apart and rotatably connected in the housing (1). The two discs (41) are fixed circumferentially and concentrically connected with the main shaft (3). The internal gear ring (5) is located between the two discs (41). The mounting holes (411) are provided on both discs (41). The rear end of the cutter barrel (2) passes through the mounting holes (411) of the two discs (41) and is rotatably connected to the two discs (41).
4. The square hole drilling machine according to claim 3, characterized in that, Both of the disc bodies (41) have relatively protruding connecting protrusions (412) on their opposite sides. The outer teeth (22) on one side of the blade cylinder (2) mesh with the inner gear ring (5), and there is a clearance gap (54) between the outer teeth (22) on the other side and the inner gear ring (5). The two connecting protrusions (412) extend into the clearance gap (54) and are circumferentially positioned by interlocking with each other in the front-back direction through the interlocking key with concave and convex arrangement.
5. The square hole drilling machine according to claim 3 or 4, characterized in that, The inner cavity of the housing (1) extends through the front and back. A circumferentially circumferential positioning protrusion (11) is provided on the inner wall of the housing (1). The aforementioned internal gear ring (5) is inserted and fixed inside the positioning protrusion (11). Two support sleeves (6) are also provided inside the housing (1). The two support sleeves (6) are located at the front and rear ends of the positioning protrusion (11) and abut against the end face of the positioning protrusion (11). Two discs (41) are respectively embedded in the ports of the two support sleeves (6). A ring of outer ball bearings (62) is pressed between the disc (41) and the support sleeve (6). Both discs (41) are pressed against the support sleeves (6) in the direction of the internal gear ring (5) by the outer ball bearings (62).
6. The square hole drilling machine according to claim 5, characterized in that, The front outer edge of the internal gear ring (5) has an annular abutment protrusion (51) in the circumferential direction, and the front inner edge of the positioning protrusion (11) has an annular concave shoulder (111) in the circumferential direction. The abutment protrusion (51) of the internal gear ring (5) abuts against the concave shoulder (111) of the positioning protrusion (11). A slot (52) is provided on the outer peripheral wall of the internal gear ring (5), and a through hole (12) is provided on the side wall of the housing (1). A pin (53) positioned in the slot (52) is fixedly inserted into the through hole (12). There is a gap between the two end faces of the internal gear ring (5) and the end faces of the two discs (41).
7. The square hole drilling machine according to claim 6, characterized in that, The outer wall of the cutter barrel (2) has an annular limiting flange (23) in the circumferential direction. The rear end of the cutter barrel (2) passes through the mounting hole (411) of the two discs (41) and is screwed with a locking sleeve (8). A ring of inner balls (42) is pressed between the limiting flange (23) and the front disc (41) and between the locking sleeve (8) and the rear disc (41). When the locking sleeve (8) is locked, the limiting flange (23) and the locking sleeve (8) are pressed against the two discs (41) in the direction of the inner tooth ring (5) through the inner balls (42).
8. The square hole drilling machine according to claim 7, characterized in that, The transmission structure (7) includes a torque arm (71) fixed to the rear end of the main shaft (3) and extending radially. The torque arm (71) is fixed to the eccentric position of the rear disc (41) by a positioning pin (712).
9. The square hole drilling machine according to claim 8, characterized in that, The rear end of the main shaft (3) is also fixedly fitted with a rear dust cover (72), which is embedded in the rear support sleeve (6) and covers the rear end face of the rear disc (41). The locking screw sleeve (8) is located inside the rear dust cover (72), and the torque arm (71) is integrally formed on the rear end face of the rear dust cover (72).
10. The square hole drilling rig according to any one of claims 1 to 4, characterized in that, The transmission structure (7) includes a transmission gear (73) fixed at the rear end of the main shaft (3), and a transmission sleeve (74) fixed at the rear end of the cutter barrel (2). The transmission gear (73) is located at an eccentric position inside the transmission sleeve (74) and meshes with the transmission sleeve (74).