A deep hole turning numerical control machine tool machining clamp

Abstract

The application discloses a deep hole turning numerical control machine tool machining clamp and relates to the technical field of clamps, which comprises a mounting seat and a flange mounted on the rear side of the mounting seat, a recess is formed in the front side of the mounting seat, a rotating seat is mounted in the recess, rotating shafts are connected to the centers of the upper and lower surfaces of the rotating seat, first bearings are connected between the rotating shafts and the mounting seat, mounting grooves are formed in the centers of the peripheral side walls of the rotating seat, and chuck bodies are mounted in the four mounting grooves. The four chuck bodies can be used to clamp special-shaped parts, circular parts, square parts and thin-walled parts, and the universality of the machining clamp is achieved. The mounting seat, the rotating shafts and the rotating seat are arranged, the rotating seat is used to rotate and switch different chuck bodies to clamp workpieces of different types, the chuck bodies do not need to be disassembled and replaced, and the time interval for switching workpieces of different types for machining is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, specifically to a deep hole turning CNC machine tool machining fixture. Background Technology

[0002] Deep hole turning is a process of machining the inner wall of deep hole parts on a lathe. It generally refers to machining holes with relatively small diameters, usually less than or equal to 50 mm, but with a depth-to-diameter ratio greater than 5. Deep hole turning CNC machine tools usually consist of a bed, spindle box, fixture, cutting tool, and cooling and chip removal system. The fixture is mostly a chuck, which holds one end of the workpiece, while the other end of the workpiece is connected to the cutting tool. The cutting tool rotates and advances to perform turning machining on the deep hole of the workpiece.

[0003] Existing chucks are usually connected to the spindle box via a rear flange. Based on the number of jaws, they can be divided into two-jaw chucks, three-jaw chucks, four-jaw chucks, five-jaw chucks, and six-jaw chucks. Two-jaw chucks are mostly used for clamping irregularly shaped objects, three-jaw chucks are mostly used for clamping round objects, four-jaw chucks are mostly used for clamping square objects, and five-jaw and six-jaw chucks are mostly used for clamping thin-walled parts.

[0004] Existing chucks are limited in their ability to universally clamp workpieces of various shapes, resulting in overly narrow applications. This is particularly problematic when machining certain alloy cutting tools, where tool types and shapes vary significantly. For instance, some thin-walled tools requiring intermediate hole machining are unsuitable for two-jaw chucks, as are some cylindrical turning alloy cutting tools requiring hole machining (internal cooling holes) at the top. Consequently, before performing deep hole turning, different types of chucks must be installed depending on the workpiece's specific shape. Furthermore, traditional chucks rely on numerous bolts for installation, leading to time-consuming disassembly and frequent changes that negatively impact machining efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a deep hole turning CNC machine tool machining fixture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a deep hole turning CNC machine tool machining fixture, comprising a mounting base and a flange mounted on the rear side of the mounting base, a groove is provided on the front side of the mounting base, a rotary seat is installed inside the groove, a rotating shaft is connected to the center of the upper and lower surfaces of the rotary seat, a first bearing is connected between the two rotating shafts and the mounting base, a mounting groove is provided at the center of the four side walls of the rotary seat, a chuck body is installed inside each of the four mounting grooves, a slot is provided inside the rotary seat inside the four mounting grooves, and the four slots are staggered in the vertical direction, a movable groove is provided inside the rotary seat above the four slots, a pressure block is installed inside the movable groove above the four slots, a connecting frame is connected between two adjacent pressure blocks, a movable column is connected to the upper surface of the uppermost pressure block, and a spring is installed on the upper surface of the connecting frame on one side of the movable column.

[0007] Preferably, the rotating seat is cubic in shape, and the rotating seat is rotatably connected to the mounting seat via a rotating shaft. The four chuck bodies are respectively mounted on the four side walls of the rotating seat.

[0008] Preferably, the number of pressing blocks is four and they are staggered in the vertical direction. The longitudinal section of each pressing block is a right trapezoid that is wider at the top and narrower at the bottom, and the cross-section is capsule-shaped. The hypotenuses of the four pressing blocks face outwards from the four sides respectively.

[0009] Preferably, the connecting frame is U-shaped, and two adjacent pressure blocks are connected by the connecting frame, which is slidably connected to the inner wall of the movable groove.

[0010] Preferably, the upper surface of the movable column is provided with a threaded groove, and a screw is threadedly connected in the threaded groove. A second bearing is connected between the top of the screw and the rotating seat. A first gear is installed on the outside of the screw between the second bearing and the movable column. A second gear is meshed with one side of the first gear. A central shaft is connected through the middle of the second gear. A third bearing is connected between the bottom of the central shaft and the rotating seat. A knob is connected to the top of the central shaft extending from the upper surface of the rotating seat.

[0011] Preferably, the screw is inserted into the inner wall of the threaded groove to form a threaded connection with the movable column, and the screw is rotatably connected to the central shaft via the first gear and the second gear.

[0012] Preferably, each of the four chuck bodies has a sliding groove on its outer sidewall, a chuck claw is slidably connected inside the sliding groove, a rack is connected to the inner sidewall of the chuck claw, a large bevel gear is installed inside the chuck body inside the rack, a spiral groove is provided on the front side of the large bevel gear, a small bevel gear is meshed with the rear side of the large bevel gear, a rotating shaft is connected through the middle of the small bevel gear, a fourth bearing is connected between the rotating shaft and the chuck body, a countersunk end is connected to the top of the rotating shaft, an insert plate is connected to the inner sidewall of the chuck body, and an elongated hole is opened through the end of the insert plate away from the chuck body.

[0013] Preferably, the number of jaws in the four chuck bodies is two, three, four, and six in a clockwise order, and all of the jaws are engaged with a rack and a helical groove.

[0014] Preferably, the four insert plates inside the chuck body are staggered in the vertical direction, the insert plates are movably connected to the slots, the pressure block is movably connected to the insert plates through the elongated hole, and the length of the top of the pressure block is greater than the length of the elongated hole.

[0015] Preferably, a limit rod is connected to the outer wall of the rotating shaft below the rotating seat. There are four limit rods forming a cross shape along the outer wall of the rotating shaft. Each of the four limit rods has a through hole. A through hole is provided in the mounting seat below the last limit rod. A limit bolt is installed inside the through hole. The limit bolt passes through the through hole and is threaded to the limit rod through the screw hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This deep hole turning CNC machine tool machining fixture has four chuck bodies. The number of jaws in the four chuck bodies are two, three, four and six in a clockwise direction. The four chuck bodies form a two-jaw chuck, a three-jaw chuck, a four-jaw chuck and a six-jaw chuck in a clockwise direction, so that the rotary table can clamp irregularly shaped parts, round parts, square parts and thin-walled parts. In the case of machining thin-walled tools or cylindrical tools, the machining fixture can be universal.

[0017] 2. This deep hole turning CNC machine tool machining fixture is configured with a mounting base, a rotating shaft, and a rotary seat. After the mounting base is installed on the machine tool spindle box via a flange, the rotary seat is rotated by turning it. The rotary seat drives the rotating shaft to rotate relative to the mounting base, and the rotary seat drives the four chuck bodies installed around it to rotate. By rotating the rotary seat, different chuck bodies can be switched to clamp different types of workpieces without disassembling the chucks for replacement, which greatly shortens the time interval between switching between different types of workpieces for processing.

[0018] 3. This deep hole turning CNC machine tool machining fixture, through the setting of insert plates, pressure blocks, and connecting brackets, drives the insert plates to insert into the slot when the chuck body is installed on the rotary seat. The knob drives the central shaft to rotate, the central shaft drives the second gear to rotate, the second gear drives the first gear to rotate, the first gear drives the screw to rotate, and the screw drives the movable column to move down through the threaded groove. The movable column pushes the uppermost pressure block down, and the uppermost pressure block drives the other three pressure blocks down through the connecting bracket. The four pressure blocks move down and insert into the elongated hole in the insert plate. The inclined edge of the pressure block presses against the inner wall of the elongated hole, pushing the insert plate to move laterally until it is fully inserted into the slot, maintaining the tightness of the chuck body inserted into the mounting slot. At the same time, multiple pressure blocks move down in linkage, synchronously fastening the four insert plates. When the knob is turned in the opposite direction, the four pressure blocks move up synchronously, canceling the fastening effect of the pressure blocks, achieving the effect of synchronous disassembly and assembly of the four chuck bodies, greatly accelerating the disassembly and assembly speed of the chuck body.

[0019] 4. This deep hole turning CNC machine tool machining fixture, by setting a limit plate and limit bolt, when the rotary seat rotates to switch the chuck body for use, the rotating shaft under the rotary seat drives the limit rod to rotate, and switch the other limit rod to be above the through hole. The limit bolt passes through the through hole and is threadedly connected to the screw hole to limit the limit rod laterally, thereby limiting the rotary seat laterally. This can effectively maintain the stability of the rotary seat when it rotates longitudinally with the mounting base. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is an isometric view of the rotary seat of the present invention; Figure 4 This is a side sectional view of the chuck body of the present invention; Figure 5 This is an isometric view of the chuck body of the present invention; Figure 6 This is a side sectional view of the rotary seat of the present invention; Figure 7 This is a schematic diagram of the connection structure between the pressure block and the connecting frame of the present invention.

[0021] In the diagram: 1. Mounting base; 2. Flange; 3. Groove; 4. Rotary seat; 41. Slot; 42. Movable groove; 43. Pressure block; 44. Connecting frame; 45. Movable column; 451. Threaded groove; 452. Screw; 453. Second bearing; 454. First gear; 455. Second gear; 456. Central shaft; 457. Third bearing; 458. Knob; 46. Spring; 5. Rotating shaft; 6. First bearing; 7. Mounting groove; 8. Chuck body; 81. Slide groove; 82. Claw; 83. Rack; 84. Large bevel gear; 85. Spiral groove; 86. Small bevel gear; 87. Rotating shaft; 88. Fourth bearing; 89. Countersunk end; 810. Insert plate; 811. Long hole; 9. Limiting rod; 10. Screw hole; 11. Through hole; 12. Limiting bolt. Detailed Implementation

[0022] 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, and 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.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figures 1 to 7As shown, the deep hole turning CNC machine tool machining fixture in this embodiment includes a mounting base 1 and a flange 2 mounted on the rear side of the mounting base 1. The mounting base 1 is mounted on the spindle box of the machine tool through the flange 2, replacing the traditional chuck directly mounted on the spindle box. A groove 3 is provided on the front side of the mounting base 1 for mounting a rotary seat 4 and providing space for the rotary seat 4 to rotate around the rotating shaft 5. The rotary seat 4 is installed inside the groove 3. The center of the upper and lower surfaces of the rotary seat 4 is connected to the rotating shaft 5. The rotary seat 4 is coaxially arranged with the mounting base 1. A first bearing 6 is connected between the two rotating shafts 5 and the mounting base 1. The rotating shafts 5 are rotatably connected to the mounting base 1 through the first bearing 6. The center of the four side walls of the rotary seat 4 is provided with mounting slots 7 for mounting the chuck body 8. The four mounting slots 7 are located inside the... Each of the four mounting slots 7 is equipped with a chuck body 8. The rotating base 4 inside each of the four mounting slots 7 has a slot 41. The four slots 41 are staggered in the vertical direction, so that the insert plates 810 on the four chuck bodies 8 are also staggered in the vertical direction after being inserted into the slots 41, so as to avoid being blocked by the structure. The rotating base 4 above the four slots 41 has a common movable slot 42. The movable slot 42 above the four slots 41 is equipped with a pressure block 43. A connecting frame 44 is connected between two adjacent pressure blocks 43 to connect the two adjacent pressure blocks 43. The upper surface of the uppermost pressure block 43 is connected to a movable column 45. A spring 46 is installed on the upper surface of the connecting frame 44 on one side of the movable column 45. The spring 46 is used to maintain the stability of the lifting and lowering of the connecting frame 44.

[0026] Specifically, the rotating seat 4 is cubic in shape, and its length is matched with the length of the groove 3. In practical applications, the length of the groove 3 must be sufficient for the rotating seat 4 to rotate around the rotating shaft 5. The rotating seat 4 is rotatably connected to the mounting base 1 via the rotating shaft 5. Four chuck bodies 8 are respectively installed on the four side walls of the rotating seat 4. The rotating seat 4 drives the four chuck bodies 8 installed around it to rotate. By rotating the rotating seat 4, different chuck bodies 8 can be switched to clamp different types of workpieces without disassembling the chucks for replacement, which greatly shortens the time interval for switching between different types of workpieces for processing.

[0027] Furthermore, there are four pressure blocks 43, which are staggered in the vertical direction. The four pressure blocks 43 correspond to the elongated holes 811 on the four insert plates 810. The longitudinal section of the pressure block 43 is a right trapezoid with a wider top and a narrower bottom, and the cross section is capsule-shaped. The four pressure blocks 43 are coaxially arranged on the side closest to the vertical edge, and are coaxial with the movable column 45 and the rotating seat 4. The inclined sides of the four pressure blocks 43 face the four directions respectively. The direction in which the inclined sides of the pressure blocks 43 face is the direction in which the corresponding insert plate 810 is inserted. The pressure block 43 moves down and is inserted into the elongated hole 811 in the insert plate 810. The inclined side of the pressure block 43 presses the inner wall of the elongated hole 811, pushing the insert plate 810 to move laterally until it is fully inserted into the slot 41, maintaining the tightness of the chuck body 8 inserted into the mounting slot 7.

[0028] Furthermore, the connecting frame 44 is U-shaped and made of a non-deformable alloy. The connecting frame 44 transmits the compressive force of the pressure block 43 downwards. Adjacent pressure blocks 43 are connected by the connecting frame 44, which is slidably connected to the inner wall of the movable groove 42. Figure 7 As shown, from top to bottom, the first pressure block 43 and the second pressure block 43 are connected by the left connecting bracket 44, the second pressure block 43 and the third pressure block 43 are connected by the right connecting bracket 44, and the third pressure block 43 and the fourth pressure block 43 are connected by the rear connecting bracket 44. The installation position of the connecting bracket 44 should avoid the insert plates 810 inserted from all sides to ensure that the four pressure blocks 43 and the connecting bracket 44 can be raised and lowered in the movable slot 42. When the movable column 45 pushes the uppermost pressure block 43 to rise and fall, the pressure block 43 drives the other three pressure blocks 43 to rise and fall through the connecting bracket 44, so as to achieve the effect of simultaneous disassembly and assembly of the four chuck bodies 8, which greatly speeds up the disassembly and assembly of the chuck bodies 8.

[0029] Furthermore, a threaded groove 451 is provided on the upper surface of the movable column 45. A screw 452 is threadedly connected to the threaded groove 451. The outer diameter of the screw 452 is adapted to the inner diameter of the threaded groove 451. A second bearing 453 is connected between the top of the screw 452 and the rotating seat 4. The screw 452 is rotatably connected to the rotating seat 4 via the second bearing 453. A first gear 454 is installed on the outer side of the screw 452 between the second bearing 453 and the movable column 45. A second gear 455 is meshed on one side of the first gear 454. A central shaft 456 is connected through the middle of the second gear 455. A third bearing 457 is connected between the bottom of the central shaft 456 and the rotating seat 4. The central shaft 456 is rotatably connected to the rotating seat 4 via the third bearing 457. The top of the central shaft 456 extends from the upper surface of the rotating seat 4 and is connected to a knob 458.

[0030] Furthermore, the screw 452 is inserted into the inner wall of the threaded groove 451 and forms a threaded connection with the movable column 45. The screw 452 is rotatably connected to the central shaft 456 via the first gear 454 and the second gear 455. The central shaft 456 is rotated by the knob 458, which in turn drives the second gear 455 to rotate. The second gear 455 drives the first gear 454 to rotate, which in turn drives the screw 452 to rotate. The screw 452 drives the movable column 45 to rise and fall via the threaded groove 451, and the movable column 45 pushes the uppermost pressure block 43 to rise and fall.

[0031] Furthermore, each of the four chuck bodies 8 has a sliding groove 81 on its outer side wall. A jaw 82 is slidably connected inside the sliding groove 81. A rack 83 is connected to the inner side wall of the jaw 82. A large bevel gear 84 is installed inside the chuck body 8 inside the rack 83. A spiral groove 85 is provided on the front side of the large bevel gear 84. The spiral groove 85 is spiral-shaped, and the racks 83 on the side walls of the multiple jaws are inserted into the threaded grooves 451. A small bevel gear 86 is meshed with the rear side of the large bevel gear 84. A rotating shaft 87 is connected through the middle, and a fourth bearing 88 is connected between the rotating shaft 87 and the chuck body 8. The rotating shaft 87 is rotatably connected to the chuck body 8 via the fourth bearing 88. A countersunk end 89 is connected to the top of the rotating shaft 87. A wrench can be inserted into the countersunk end 89 and rotated. An insert plate 810 is connected to the inner side wall of the chuck body 8. An elongated hole 811 is opened through the end of the insert plate 810 away from the chuck body 8. The elongated hole 811 is capsule-shaped.

[0032] Furthermore, the number of jaws 82 in the four chuck bodies 8 are two, three, four, and six in a clockwise direction. The four chuck bodies 8 are arranged in a clockwise direction to form a two-jaw chuck, a three-jaw chuck, a four-jaw chuck, and a six-jaw chuck. The two-jaw chuck is used to clamp irregularly shaped parts, the three-jaw chuck is used to clamp round parts, the four-jaw chuck is used to clamp square parts, and the six-jaw chuck is used to clamp thin-walled parts. Different chuck bodies 8 can be selected for clamping workpieces of different shapes. All jaws 82 are engaged with the rack 83 and the helical groove 85. Like the drive structure of a traditional chuck, the rack 83 is driven to rise and fall by the rotation of the helical groove 85 to achieve self-centering clamping.

[0033] Furthermore, the insert plates 810 inside the four chuck bodies 8 are staggered in the vertical direction. The insert plates 810 are movably inserted into the slots 41. When the chuck body 8 is inserted into the mounting slot 7, it drives the insert plates 810 to be inserted into the slots 41. The pressure block 43 is movably inserted into the insert plate 810 through the elongated hole 811. The length of the top of the pressure block 43 is greater than the length of the elongated hole 811. The four pressure blocks 43 move down and are inserted into the elongated hole 811 inside the insert plate 810. The inclined edge of the pressure block 43 presses against the inner wall of the elongated hole 811, pushing the insert plate 810 to move laterally until it is fully inserted into the slot 41. This restricts the insert plate 810 from moving up and down in the slot 41 and also restricts the insert plate 810 from moving horizontally in the slot 41.

[0034] Furthermore, four limit rods 9 are connected to the outer wall of the rotating shaft 5 below the rotating seat 4, forming a cross shape along the outer wall of the rotating shaft 5. Each of the four limit rods 9 has a threaded hole 10. A through hole 11 is provided in the mounting seat 1 below the last limit rod 9. The through hole 11 and the threaded hole 10 are coaxially arranged. A limit bolt 12 is installed inside the through hole 11. The limit bolt 12 passes through the through hole 11 and is threaded to the limit rod 9 through the threaded hole 10. By using the limit bolt 12 to pass through the through hole 11 and threaded to the threaded hole 10, the through hole 11 and the threaded hole 10 are aligned, so that the limit rod 9 drives the rotating seat 4 to rotate 90° precisely via the rotating shaft 5. On the other hand, the limit bolt 12 limits the limit rod 9 laterally, thereby limiting the rotating seat 4 laterally, which can effectively maintain the stability of the rotating seat 4 when it rotates longitudinally with the mounting seat 1.

[0035] The usage method of this embodiment is as follows: When the user actually uses this machining fixture to clamp the workpiece for deep hole turning, firstly, insert the four chuck bodies 8 into the mounting slots 7 around the rotary seat 4 respectively. The number of jaws 82 in the four chuck bodies 8 should be two, three, four, and six in a clockwise sequence. When the chuck bodies 8 are inserted, the insert plate 810 is inserted into the slot 41. Then, rotate the knob 458. The knob 458 drives the central shaft 456 to rotate, the central shaft 456 drives the second gear 455 to rotate, the second gear 455 drives the first gear 454 to rotate, the first gear 454 drives the screw 452 to rotate, and the screw 452 drives the movable column 45 to move downwards through the threaded groove 451. The movable column 45 pushes the uppermost pressure block 43 downwards. The square pressure block 43, via the connecting frame 44, drives the other three pressure blocks 43 downwards, causing the four pressure blocks 43 to insert into the elongated hole 811. The inclined edges of the pressure blocks 43 press against the inner wall of the elongated hole 811, pushing the insert plate 810 to move laterally until it is fully inserted into the slot 41, maintaining the tightness of the chuck body 8 inserted into the mounting slot 7. Then, the rotating shafts 5 on the upper and lower sides of the rotary seat 4 are installed in the mounting seat 1 via the first bearing 6. The rotary seat 4 is located in the groove 3. Then, the mounting seat 1 is installed on the spindle box of the machine tool via the flange 2. Then, according to the specific shape of the workpiece, the rotary seat 4 is rotated. The rotary seat 4 drives the rotating shafts 5 to rotate relative to the mounting seat 1. The rotary seat 4 drives the four chuck bodies 8 installed around it to rotate, adjusting the chuck body 8 suitable for the shape to the mounting seat. At the front position of mounting base 1, a two-jaw chuck is used for irregularly shaped parts, a three-jaw chuck for round parts, a four-jaw chuck for square parts, and a six-jaw chuck for thin-walled parts. While the rotating base 4 rotates, the rotating shaft 5 below it drives the limiting rod 9 to rotate. The other limiting rod 9 is positioned above the through hole 11. Then, the limiting bolt 12 passes through the through hole 11 and the screw hole 10 sequentially from below the mounting base 1. The limiting bolt 12 is used to adjust the alignment of the through hole 11 and the screw hole 10, allowing the limiting rod 9 to drive the rotating base 4 to rotate precisely 90° via the rotating shaft 5. Then, the limiting bolt 12 is rotated to connect with the limiting rod 9 via a thread, providing lateral limiting for the limiting rod 9, and thus lateral limiting for the rotating base 4. This maintains the stability of the rotating base 4 when it rotates longitudinally with the mounting base 1. The workpiece is then placed in the... At the center of the front side of the chuck body 8, a wrench is inserted into the countersunk end 89 from above the mounting groove 7. The wrench drives the countersunk end 89 to rotate, which in turn drives the rotating shaft 87 to rotate. The rotating shaft 87 drives the small bevel gear 86 to rotate, which in turn drives the large bevel gear 84 to rotate. The large bevel gear 84 drives the spiral groove 85 to rotate, and the inner wall of the spiral groove 85 pushes multiple racks 83 to move. The racks 83 drive multiple jaws to move toward the center of the chuck body 8 within the slide groove 81 to center and clamp the workpiece. Then, the spindle box drives the mounting base 1 to rotate longitudinally, which in turn drives the rotating base 4 to rotate longitudinally. The rotating base 4 drives the chuck body 8 and the workpiece it clamps to rotate longitudinally. The end of the workpiece away from the chuck body 8 is cut by the cutting tool.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep hole turning CNC machine tool machining fixture, comprising a mounting base (1) and a flange (2) mounted on the rear side of the mounting base (1), characterized in that: The mounting base (1) has a groove (3) on its front side, and a rotating seat (4) is installed inside the groove (3). A rotating shaft (5) is connected to the center of the upper and lower surfaces of the rotating seat (4). A first bearing (6) is connected between each of the two rotating shafts (5) and the mounting base (1). A mounting groove (7) is opened at the center of each of the four side walls of the rotating seat (4). A chuck body (8) is installed inside each of the four mounting grooves (7). A slot (41) is opened inside the rotating seat (4) inside each of the four mounting grooves (7). The four slots (41) are staggered in the vertical direction. The rotating seat (4) above the four slots (41) has a common movable slot (42). The movable slot (42) above the four slots (41) is equipped with a pressure block (43). A connecting frame (44) is connected between two adjacent pressure blocks (43). A movable column (45) is connected to the upper surface of the uppermost pressure block (43). A spring (46) is installed on the upper surface of the connecting frame (44) on one side of the movable column (45). The rotating seat (4) is cubic in shape. The rotating seat (4) is rotatably connected to the mounting seat (1) via a rotating shaft (5). The four chuck bodies (8) are respectively installed on the four side walls of the rotating seat (4). The upper surface of the movable column (45) is provided with a threaded groove (451), and a screw (452) is threadedly connected to the threaded groove (451). A second bearing (453) is connected between the top of the screw (452) and the rotating seat (4). A first gear (454) is installed on the outside of the screw (452) between the second bearing (453) and the movable column (45). A second gear (455) is meshed on one side of the first gear (454). A central shaft (456) is connected through the middle of the second gear (455). A third bearing (457) is connected between the bottom of the central shaft (456) and the rotating seat (4). The top of the central shaft (456) extends from the upper surface of the rotating seat (4) and is connected to a knob (458).

2. The deep hole turning CNC machine tool machining fixture according to claim 1, characterized in that: The number of the pressing blocks (43) is four and they are staggered in the vertical direction. The longitudinal section of the pressing block (43) is a right trapezoid with a wider top and a narrower bottom and a capsule-shaped cross section. The hypotenuses of the four pressing blocks (43) face the four sides respectively.

3. The deep hole turning CNC machine tool machining fixture according to claim 1, characterized in that: The connecting frame (44) is U-shaped, and two adjacent pressure blocks (43) are connected by the connecting frame (44). The connecting frame (44) is slidably connected to the inner wall of the movable groove (42).

4. The deep hole turning CNC machine tool machining fixture according to claim 1, characterized in that: The screw (452) is inserted into the inner wall of the threaded groove (451) and forms a threaded connection with the movable column (45). The screw (452) is rotatably connected to the central shaft (456) via the first gear (454) and the second gear (455).

5. The deep hole turning CNC machine tool machining fixture according to claim 1, characterized in that: The four chuck bodies (8) are provided with a sliding groove (81) on their outer side walls. A chuck claw (82) is slidably connected inside the sliding groove (81). A rack (83) is connected to the inner side wall of the chuck claw (82). A large bevel gear (84) is installed inside the chuck body (8) inside the rack (83). A spiral groove (85) is provided on the front side of the large bevel gear (84). A small bevel gear (86) is meshed on the rear side of the large bevel gear (84). A rotating shaft (87) is connected through the middle of the small bevel gear (86). A fourth bearing (88) is connected between the rotating shaft (87) and the chuck body (8). A countersunk end (89) is connected to the top of the rotating shaft (87). An insert plate (810) is connected to the inner side wall of the chuck body (8). An elongated hole (811) is provided through the end of the insert plate (810) away from the chuck body (8).

6. The deep hole turning CNC machine tool machining fixture according to claim 5, characterized in that: The number of jaws (82) in the four chuck bodies (8) are two, three, four and six in clockwise order, and multiple jaws (82) are engaged with the helical groove (85) via a rack (83).

7. The deep hole turning CNC machine tool machining fixture according to claim 5, characterized in that: The four insert plates (810) inside the chuck body (8) are staggered in the vertical direction. The insert plates (810) are movably inserted into the slots (41). The pressure block (43) is movably inserted into the insert plates (810) through the elongated hole (811). The length of the top of the pressure block (43) is greater than the length of the elongated hole (811).

8. The deep hole turning CNC machine tool machining fixture according to claim 1, characterized in that: The outer wall of the rotating shaft (5) below the rotating seat (4) is connected to a limiting rod (9). There are four limiting rods (9) forming a cross shape along the outer wall of the rotating shaft (5). Each of the four limiting rods (9) has a threaded hole (10). The mounting seat (1) below the last limiting rod (9) has a through hole (11). A limiting bolt (12) is installed inside the through hole (11). The limiting bolt (12) passes through the through hole (11) and is threaded to the limiting rod (9) through the threaded hole (10).

Images