Numerical control machining tool for shaft parts

Abstract

The invention relates to the technical field of machining, and discloses a shaft part numerical control machining tool which comprises a base, a protective cover, a clamping jaw disc, a lifting frame, a top seat and a connecting plate. In the shaft part numerical control machining tool, multiple clamping seats can be synchronously driven to move by means of rotation of a worm wheel, and quick clamping of shaft parts is achieved; a plurality of clamping blocks are arranged at the contact end of the clamping base and the part, the contact area can be increased, clamping stability can be improved, the clamping base can be replaced according to needs to enlarge the application range of the device, meanwhile, a workpiece extrudes an ejector pin to enable a limiting claw to be tightly attached to the outer wall of the part, a roller at the contact end can reliably limit the part, radial run-out during machining is avoided, and precision is guaranteed. The spindle oil duct is matched with the angular contact ball bearing in the fixing seat, axial movement of the spindle can be effectively prevented, the electric push rod is firstly pushed out of the clamping rod in the clamping groove, the adjusting motor drives the cutterhead frame to rotate to complete quick tool changing, and repeated disassembly is not needed. After tool changing, the electric push rod drives the clamping rod to reset and lock the cutterhead frame, so that the cutterhead frame is prevented from moving during working to guarantee the precision, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical processing, in particular to a shaft part numerical control machining tool. BACKGROUND

[0002] In the field of mechanical manufacturing, shaft parts as the core components of various transmission equipment and precision instruments, the machining precision and production efficiency directly determine the performance and quality of the terminal product. With the rapid development of automobile, aerospace, high-end equipment manufacturing and other industries, the market demand for shaft parts machining presents the characteristics of "high precision, multi-specification, fast delivery", which puts forward more stringent requirements on the performance of shaft part numerical control machining tool. However, in the actual application of the current mainstream shaft part numerical control machining tool, there are still some key technical problems such as insufficient clamping stability, low efficiency of adjusting the size of clamping jaw and complicated switching of multi-process machining, which seriously restrict the improvement of machining precision and production efficiency.

[0003] The existing numerical control machining tool mostly uses three-jaw chuck or four-jaw chuck as clamping mechanism, which has two key problems in actual application: on the one hand, for shaft parts of different diameter specifications, the adaptive clamping jaw needs to be replaced or manually adjusted. The traditional clamping jaw adjustment method highly depends on the experience of the operator, and the adjustment process needs to measure the fitting gap between the clamping jaw and the workpiece repeatedly, which not only consumes a lot of time, but also is difficult to accurately ensure the centering of the clamping jaw. This problem directly leads to the radial runout of the workpiece during machining, and further causes the machining precision deviation of the key parts such as the outer circle and step surface of the shaft part, which cannot meet the machining standard of high-precision shaft parts. At the same time, due to the weak rigidity of some shaft parts or the small contact area between the clamping jaw and the workpiece, the workpiece is easily deformed or displaced under the action of cutting force, which further affects the machining quality.

[0004] On the other hand, shaft part machining usually involves multiple processes, and the existing numerical control machining tool has significant limitations in multi-process machining scene: first, most of the tools use single-spindle single-tool holder tool mounting structure, and need to stop and replace the tool after completing each process. The replacement process needs to manually disassemble the old tool, install the new tool and calibrate the tool, which seriously occupies the machining time and greatly reduces the production efficiency; second, for some complex shaft parts, the workpiece needs to be transferred between different machines or different stations of the same machine during machining. Each transfer needs to disassemble the workpiece and re-clamp and position it, and each clamping and positioning introduces new positioning error, which accumulates after multiple transfers, often exceeding the preset precision requirement of the part, resulting in a decrease in machining qualification rate. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides a shaft part numerical control machining machine tool, which solves the problems of low clamping efficiency, insufficient clamping stability, low tool changing efficiency and excessive accumulation of positioning errors caused by multiple dismounting of the existing claw disc.

[0007] (II) Technical scheme

[0008] To achieve the above object, the present application is implemented by the following technical scheme: a shaft part numerical control machining machine tool, comprising a base, a protective cover, a claw disc, a lifting frame, a top seat and a connecting plate, the base is provided with a clamping assembly for fixing the shaft part, the lifting frame is provided with a tool changing assembly for changing tools:

[0009] The clamping assembly comprises a plurality of sliding grooves uniformly provided on the claw disc, a sliding seat is slidably connected in the sliding groove, a clamping seat is inserted into the sliding seat, a plurality of clamping blocks are uniformly rotatably connected to the clamping end of the clamping seat, a rotating groove is provided in the claw disc, an adjusting plate is rotatably connected in the rotating groove, a plurality of arc-shaped grooves are uniformly provided on the adjusting plate, and the arc-shaped grooves are matched with the sliding seat, an expansion groove is provided in the top seat, a connecting rod is slidably connected in the expansion groove, a top pin and an expansion plate are fixedly connected to the two ends of the connecting rod, a plurality of sliding rods are uniformly fixedly connected to the end of the expansion plate close to the claw disc, a hinged plate is rotatably connected to the end of the sliding rod away from the expansion plate, a plurality of fixing frames are uniformly fixedly connected to the end of the top seat close to the claw disc, a limiting claw is rotatably connected in the fixing frame, and the hinged plate is rotatably connected with the limiting claw.

[0010] The tool changing assembly comprises a lifting seat slidably connected in the lifting frame, an installation groove is provided in the lifting seat, an adjusting motor is fixedly connected in the installation groove, an electric push rod is fixedly connected to the output end of the adjusting motor, and a tool holder disc is fixedly connected to the output end of the electric push rod.

[0011] Preferably, the upper surface of the base is fixedly connected with a plurality of sliding rails, the two ends of the top seat are fixedly connected with first sliding blocks, the first sliding blocks are slidably connected with the sliding rails, the end of the top seat close to the base is fixedly connected with a first screw rod seat, and a first screw rod is threadedly connected in the first screw rod seat.

[0012] Preferably, an adjusting groove is provided in the connecting plate, a first toothed plate is slidably connected in the adjusting groove, and the first toothed plate is fixedly connected with the lifting frame, two second sliding blocks are symmetrically mounted on the end of the connecting plate close to the base, and the second sliding blocks are slidably connected with the sliding rails.

[0013] Preferably, a second screw rod seat is fixedly connected to the end of the connecting plate close to the base, and a second screw rod is threadedly connected in the second screw rod seat.

[0014] Preferably, one end of the lifting seat close to the tool holder disc is fixedly connected with a limiting ring, the other end of the lifting seat is fixedly connected with a second toothed plate, one end of the tool holder disc close to the lifting seat is uniformly fixedly connected with a plurality of clamping rods, a plurality of clamping grooves are uniformly arranged on the limiting ring, and the clamping grooves are matched with the clamping rods.

[0015] Preferably, the upper surface of the base is fixedly connected with a fixing seat, an angular contact ball bearing is fixedly connected in the fixing seat, a main shaft is rotatably connected in the fixing seat, the outer wall of the main shaft is fixedly connected with the inner ring wall of the angular contact ball bearing, an oil channel is arranged in the fixing seat, and an oil pipe is fixedly connected in the oil channel.

[0016] Preferably, the upper surface of the base is fixedly connected with an oil storage tank, a driving motor and an oil pump, the output end of the driving motor is fixedly connected with a toothed belt pulley, the toothed belt pulley is sleeved with a toothed belt, and the main shaft is fixedly connected with the jaw disc.

[0017] Preferably, the oil storage tank and the oil pump are communicated through the oil pipe, and the adjusting plate is fixedly connected with a worm gear at one end close to the main shaft.

[0018] Preferably, one end of the sliding seat close to the top seat is fixedly connected with a mounting frame, a plug rod is slidably connected to the mounting frame, and the plug rod is matched with the clamping seat.

[0019] Preferably, one end of the tool holder disc away from the limiting ring is uniformly fixedly connected with a plurality of tool handle seats.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1、In the present application, the clamping assembly is arranged to solve the problems of low clamping efficiency and insufficient clamping stability of the jaw disc of the existing device, the worm gear is rotated to synchronously drive the movement of the plurality of clamping seats, the shaft parts are quickly clamped, a plurality of clamping blocks are arranged on the contact end of the clamping seat and the shaft part, the contact area between the clamping seat and the shaft part is increased, the clamping stability of the parts is significantly improved, the corresponding clamping seat can be replaced according to the type of the parts processed by the device, and the application range of the device is further expanded.

[0022] 2、The tool changing assembly is arranged in the application, the problems of low tool changing efficiency and excessive positioning error accumulation caused by multiple disassembly are solved, during work, the clamping rod is first pushed out of the clamping groove by the electric push rod, then the tool disc holder is driven to rotate by adjusting the motor, and the tool changing operation is quickly completed without multiple disassembly of parts, after the tool changing is completed, the clamping rod is inserted into the clamping groove again by the electric push rod, the stable locking of the tool disc holder is realized, the movement of the tool disc holder during work is avoided, the machining precision is ensured, the tool changing time is greatly reduced, and the overall machining efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the shaft part numerical control machining machine tool of the application;

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the protective cover of the shaft part numerical control machining machine tool of the application;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the fixing seat of the shaft part numerical control machining machine tool of the application;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the clamping jaw disc of the shaft part numerical control machining machine tool of the application;

[0027] Figure 5 It is a schematic diagram of the structure of the slide rail of the shaft part numerical control machining machine tool of the application;

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure of the top seat of the shaft part numerical control machining machine tool of the application;

[0029] Figure 7 It is a schematic diagram of the cross-sectional structure of the connecting plate of the shaft part numerical control machining machine tool of the application;

[0030] Figure 8 It is a schematic diagram of the cross-sectional structure of the limiting ring of the shaft part numerical control machining machine tool of the application.

[0031] In the figure: 1, base; 2, protective cover; 3, jaw disc; 4, lifting frame; 5, tool holder disc; 6, top seat; 7, screw one; 8, slide rail; 9, fixed seat; 10, drive motor; 11, main shaft; 12, toothed pulley; 13, toothed belt; 14, oil pump; 15, oil tank; 16, oil pipe; 17, angular contact ball bearing; 18, oil channel; 19, arc-shaped groove; 20, worm gear; 21, adjusting plate; 22, sliding groove; 23, sliding seat; 24, clamping seat; 25, clamping block; 26, mounting frame; 27, insertion rod; 28, tool shank seat; 29, screw two; 30, first sliding block; 31, second sliding block; 32, telescopic groove; 33, telescopic plate; 34, thimble; 35, connecting rod; 36, sliding rod; 37, fixed frame; 38, limit claw; 39, hinged plate; 40, connecting plate; 41, first toothed plate; 42, adjusting groove; 43, first screw seat; 44, second screw seat; 45, second toothed plate; 46, lifting seat; 47, limit ring; 48, adjusting motor; 49, electric push rod; 50, clamping groove; 51, clamping rod; 52, mounting groove; 53, rotating groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] REFERENCE Figures 1-8The utility model provides an axle kind of spare numerical control processing machine tool, including pedestal 1, protective cover 2, dog disc 3, lifting frame 4, top seat 6 and connecting plate 40, install the clamping assembly for fixed axle kind of spare on pedestal 1, install the tool changing assembly for changing tool in lifting frame 4, clamping assembly includes the multiple slide groove 22 that even set up on dog disc 3, slide groove 22 is slidably connected with slide seat 23, and the slide seat 23 is inserted with clamping seat 24, and the clamping end of clamping seat 24 is evenly rotatably connected with multiple clamping blocks 25, and the rotary groove 53 is seted up in dog disc 3, and the rotary groove 53 is rotatably connected with adjusting plate 21, and the adjusting plate 21 is evenly seted up with multiple arc grooves 19, and arc groove 19 is adapted to slide seat 23, and the telescopic groove 32 is seted up in top seat 6, and the telescopic groove 32 is slidably connected with connecting rod 35, and the both ends of connecting rod 35 are fixedly connected with thimble 34 and telescopic plate 33, and the end close to dog disc 3 of telescopic plate 33 is evenly fixedly connected with multiple slide rods 36, and the end away from telescopic plate 33 of slide rod 36 is rotatably connected with hinged plate 39, and the end close to dog disc 3 of top seat 6 is evenly fixedly connected with multiple fixed frame 37, and the fixed frame 37 is rotatably connected with limit pawl 38, and hinged plate 39 is rotatably connected with limit pawl 38, the upper surface of pedestal 1 is fixedly connected with multiple slide rails 8, and the both ends of top seat 6 are fixedly connected with first sliding block 30, and first sliding block 30 is slidably connected with slide rail 8, and the end close to pedestal 1 of top seat 6 is fixedly connected with first screw rod seat 43, and the first screw rod seat 43 is threadedly connected with screw rod one 7, and the upper surface of pedestal 1 is fixedly connected with fixed seat 9, and fixed seat 9 is fixedly connected with angular contact ball bearing 17, and fixed seat 9 is rotatably connected with main shaft 11, and the outer wall of main shaft 11 is fixedly connected with the inner ring wall of angular contact ball bearing 17, and the oil channel 18 is seted up in fixed seat 9, and the oil channel 18 is fixedly connected with oil pipe 16, and the upper surface of pedestal 1 is fixedly connected with oil storage tank 15, drive motor 10 and oil pump 14, and the output end of drive motor 10 is fixedly connected with toothed belt pulley 12, and toothed belt pulley 12 is sleeved with toothed belt 13, and main shaft 11 is fixedly connected with dog disc 3, and oil storage tank 15 and oil pump 14 are communicated through oil pipe 16, and the end close to main shaft 11 of adjusting plate 21 is fixedly connected with worm wheel 20, and the end close to top seat 6 of slide seat 23 is fixedly connected with mounting bracket 26, and mounting bracket 26 is slidably connected with plug rod 27, and plug rod 27 is adapted to clamping seat 24.

[0034] To improve the clamping efficiency and stability of the chuck disk 3, this invention incorporates a clamping assembly. The rotation of the worm gear 20 synchronously moves multiple clamping seats 24, enabling rapid clamping of shaft-like parts. Multiple clamping blocks 25 are provided at the contact ends of the clamping seats 24 and the shaft-like parts, increasing the contact area and significantly improving clamping stability. Furthermore, the clamping seats 24 can be replaced according to the type of parts being processed, further expanding the applicability of the device. Simultaneously, the workpiece squeezes the ejector pin 34, causing the limiting claw 38 to fit tightly against the outer wall of the part. Rollers are installed at the contact ends of the limiting claw 38 and the part, providing reliable positioning and preventing radial runout during processing, thus ensuring machining accuracy. In addition, an oil passage 18 is provided at the spindle 11, and an angular contact ball bearing 17 is installed in the fixed seat 9. The combination of these two effectively prevents axial movement of the spindle 11, solving the accuracy deviation problem caused by axial movement and thermal deformation of traditional spindles 11.

[0035] Specifically, firstly, the shaft-like part is placed on the chuck disk 3. The worm gear matched with the worm wheel 20 is controlled to rotate, driving the adjusting plate 21 to rotate. The servo motor matched with the worm gear is fixedly connected to the inner wall of the rotating groove 53 and will not affect the rotation of the adjusting plate 21. The rotation of the adjusting plate 21 drives multiple slide blocks 23 to move synchronously along the corresponding slide grooves 22. The multiple slide blocks 23 move along the arc-shaped grooves 19 opened on the adjusting plate 21 to prevent the clamping seat 24 from shifting during the clamping process. Multiple clamping blocks 25 rotatably connected to the end of the clamping seat 24 near the part clamping seat clamp the shaft-like part. The multiple clamping blocks 25 increase the contact area between the clamping seat 24 and the shaft-like part, improving the stability of the clamping seat 24 in clamping the shaft-like part. The corresponding clamping seat 24 can be replaced according to the size of the shaft-like part being processed. When the clamping seat 24 needs to be replaced, the insertion rod 27 is pulled upward. A disc is fixedly connected to the outer wall of the insertion rod 27. When the insertion rod 27 is pulled upward, When the disc compresses the spring fitted on the insert rod 27, the insert rod 27 is pulled out from the clamp 24, and the clamp 24 is pulled out from the insertion slot on the slide 23. At the same time, the clamp 24 to be replaced is inserted into the insertion slot. When it reaches the designated position, the insert rod 27 is released, and the insert rod 27 will automatically fix the clamp 24. At the same time, the rotating motor matched with the lead screw 7 drives the top seat 6 to move along the slide rail 8, so that the ejector pin 34 compresses the shaft part. The center line of the ejector pin 34 is collinear with the center line of the chuck disk 3. The shaft part compresses the ejector pin 34, so that the telescopic plate 33 slides along the telescopic groove 32. The telescopic plate 33 pulls multiple slide rods 36 to move, so that the limiting claw 38 fits the roller installed at the end of the shaft part and fits the outer wall of the shaft part. Under the drive of the shaft part, they rotate synchronously. The multiple limiting claws 38 are installed in a circular array, which can limit the shaft part and avoid radial runout during processing, thus ensuring processing accuracy.

[0036] Secondly, the drive motor 10 drives the toothed pulley 12 to rotate. Since the toothed pulley 12 is also fixedly connected to the end of the main shaft 11 near the drive motor 10, and both are fitted with a toothed belt 13, the rotation of the drive motor 10 drives the main shaft 11 to rotate synchronously. The rotation of the main shaft 11 drives the chuck disk 3 and shaft parts to rotate. The two angular contact ball bearings 17 limit the main shaft 11 to prevent axial movement during rotation. The oil pump 14 delivers the lubricating oil in the oil tank 15 to the oil passage 18 opened in the fixed seat 9 to lubricate and dissipate heat from the main shaft 11. The oil passage 18 is spirally arranged. The lubricating oil after cooling is delivered back to the oil tank 15 through the oil pipe 16. The fixed seat 9 is fixedly connected with multiple heat dissipation fins to further enhance heat dissipation performance and prevent the main shaft 11 from undergoing thermal deformation due to high-speed rotation, which could lead to accuracy deviation.

[0037] refer to Figures 1-8 The tool changing assembly includes a lifting seat 46 slidably connected within the lifting frame 4. The lifting seat 46 has a mounting groove 52, and an adjusting motor 48 is fixedly connected within the mounting groove 52. An electric push rod 49 is fixedly connected to the output end of the adjusting motor 48, and a tool holder disc 5 is fixedly connected to the output end of the electric push rod 49. An adjusting groove 42 is provided on the connecting plate 40, and a first toothed plate 41 is slidably connected within the adjusting groove 42 and fixedly connected to the lifting frame 4. Two second sliders 31 are symmetrically installed on the end of the connecting plate 40 near the base 1, and the second sliders 31 are connected to the slide rail. 8. A sliding connection is provided. A second lead screw seat 44 is fixedly connected to one end of the connecting plate 40 near the base 1. A second lead screw 29 is internally threaded onto the second lead screw seat 44. A limit ring 47 is fixedly connected to one end of the lifting seat 46 near the tool holder 5. A second toothed plate 45 is fixedly connected to the other end of the lifting seat 46. Multiple locking rods 51 are evenly fixedly connected to one end of the tool holder 5 near the lifting seat 46. Multiple locking grooves 50 are evenly provided on the limit ring 47, and the locking grooves 50 are adapted to the locking rods 51. Multiple tool holder seats 28 are evenly fixedly connected to one end of the tool holder 5 away from the limit ring 47.

[0038] To improve tool changing efficiency and machining accuracy, this invention includes a tool changing assembly. During operation, the electric push rod 49 first pushes the locking rod 51 out of the slot 50, and then the adjusting motor 48 drives the tool holder disk 5 to rotate, quickly completing the tool changing operation without the need for multiple parts disassembly. After the tool changing is completed, the electric push rod 49 drives the locking rod 51 to re-insert into the slot 50, achieving a stable lock on the tool holder disk 5. This not only prevents the tool holder disk 5 from moving during operation, ensuring machining accuracy, but also significantly reduces tool changing time and improves overall machining efficiency.

[0039] Specifically, when a tool needs to be changed, the drive system matching the first toothed plate 41 in the adjusting groove 42 controls the lifting frame 4 to move along the adjusting groove 42, keeping the tool holder disk 5 away from shaft parts to avoid scratching parts during tool change. After the tool holder disk 5 moves to the predetermined position, the drive system matching the second toothed plate 45 controls the lifting seat 46 to move upward along the lifting frame 4, driving the tool holder disk 5 to move upward synchronously. The drive system matching the second lead screw 29 controls the second lead screw 29 to rotate, driving the connecting plate 40 to slide along the slide rail 8 to avoid collisions during the rotation of the tool holder disk 5. The electric push rod 49 extends, pushing the locking rod 51 installed on the tool holder disk 5 to disengage from the locking groove 50 on the limit ring 47. The adjusting motor 48 is a servo motor. By adjusting the rotation of the motor 48, the tool holder disk 5 is moved to the desired position. The replaced tool is rotated to the direction of machining shaft parts. After the tool change is completed, and since the tool for machining shaft parts is an existing component, the machining tool is not specifically shown in the figure. The machining tool is installed in the tool holder 28 and is limited by bolts. The electric push rod 49 retracts, causing the locking rod 51 to re-insert into the locking slot 50. This prevents the tool holder disk 5 from moving due to cutting force during machining. At the same time, it prevents the electric push rod 49 and the adjusting motor 48 from directly limiting the tool holder disk 5, thus avoiding damage to the electric push rod 49 and the adjusting motor 48 due to excessive cutting force. Simultaneously, the lifting seat 46 retracts into the lifting frame 4, and the first toothed plate 41 moves along the adjusting groove 42 to move the tool holder disk 5 after tool change to the shaft part for machining. This avoids disassembling the shaft part during machining, which would lead to excessive cumulative error and seriously affect machining accuracy.

[0040] The working principle of this invention is as follows: The rotation of the worm gear 20 synchronously drives the movement of multiple clamping seats 24, achieving rapid clamping of shaft-like parts. Multiple clamping blocks 25 are provided at the contact ends of the clamping seats 24 and the shaft-like parts, which increases the contact area and significantly improves the clamping stability. The corresponding clamping seat 24 can be replaced according to the type of part being processed, and also according to the size of the shaft-like parts being processed. When it is necessary to replace the clamping seat 24, the insertion rod 27 is pulled upwards. A disc is fixedly connected to the outer wall of the insertion rod 27. When the insertion rod 27 is pulled upwards... When the disc compresses the spring fitted on the insert rod 27, the insert rod 27 is pulled out from the clamp 24, and the clamp 24 is pulled out from the insertion slot on the slide 23. At the same time, the clamp 24 to be replaced is inserted into the insertion slot. When it reaches the designated position, the insert rod 27 is released and the insert rod 27 will automatically fix the clamp 24. At the same time, the workpiece squeezes the ejector pin 34, so that the limiting claw 38 fits tightly with the outer wall of the part. The contact end of the limiting claw 38 with the part is equipped with a roller, which can reliably limit the part and avoid radial runout during the processing, thus ensuring the processing accuracy. In addition, an oil passage 18 is provided at the spindle 11, and an angular contact ball bearing 17 is installed in the fixed seat 9. The two work together to effectively prevent axial movement of the spindle 11, solving the accuracy deviation problem caused by axial movement and thermal deformation of traditional spindles 11. When it is necessary to change the tool, the drive system matching the first toothed plate 41 in the adjusting groove 42 controls the lifting frame 4 to move along the adjusting groove 42, so that the tool holder disk 5 is away from the shaft parts, avoiding scratching the parts when changing tools. After the tool holder disk 5 moves to the predetermined position, the drive system matching the second toothed plate 45 controls the lifting seat 46 to move upward along the lifting frame 4. The tool holder disk 5 moves upward synchronously. The drive system, which is matched with the lead screw 29, controls the rotation of the lead screw 29, which drives the connecting plate 40 to slide along the slide rail 8 to avoid collisions during the rotation of the tool holder disk 5. The electric push rod 49 extends and first pushes the locking rod 51 out of the slot 50. Then, the electric push rod 49 drives the tool holder disk 5 to rotate through the adjustment motor 48, which quickly completes the tool changing operation without the need for multiple disassemblies of parts. After the tool changing is completed, the electric push rod 49 drives the locking rod 51 to re-insert into the slot 50, which realizes the stable locking of the tool holder disk 5 and prevents the tool holder disk 5 from moving during operation.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is 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 CNC machining tool for shaft parts, comprising a base (1), a protective cover (2), a chuck disc (3), a lifting frame (4), a top seat (6), and a connecting plate (40), characterized in that, A clamping assembly for fixing shaft-type parts is installed on the base (1), and a tool changing assembly for changing tools is installed inside the lifting frame (4). The clamping assembly includes multiple sliding grooves (22) evenly opened on the jaw disk (3), a slide seat (23) is slidably connected in the sliding groove (22), a clamping seat (24) is inserted in the slide seat (23), multiple clamping blocks (25) are evenly rotatably connected to the clamping end of the clamping seat (24), a rotating groove (53) is opened in the jaw disk (3), an adjusting plate (21) is rotatably connected in the rotating groove (53), multiple arc-shaped grooves (19) are evenly opened on the adjusting plate (21), and the arc-shaped grooves (19) are adapted to the slide seat (23), and a telescopic groove (32) is opened in the top seat (6). A connecting rod (35) is slidably connected inside the telescopic groove (32). A pin (34) and a telescopic plate (33) are fixedly connected to both ends of the connecting rod (35). A plurality of sliding rods (36) are evenly fixedly connected to one end of the telescopic plate (33) near the claw disk (3). A hinge plate (39) is rotatably connected to one end of the sliding rod (36) away from the telescopic plate (33). A plurality of fixing frames (37) are evenly fixedly connected to one end of the top seat (6) near the claw disk (3). A limiting claw (38) is rotatably connected inside the fixing frame (37), and the hinge plate (39) is rotatably connected to the limiting claw (38). The tool changing assembly includes a lifting seat (46) that is slidably connected in the lifting frame (4). The lifting seat (46) has an installation groove (52) in it. An adjusting motor (48) is fixedly connected in the installation groove (52). An electric push rod (49) is fixedly connected to the output end of the adjusting motor (48). A tool holder disc (5) is fixedly connected to the output end of the electric push rod (49).

2. The CNC machining tool for shaft parts according to claim 1, characterized in that: The upper surface of the base (1) is fixedly connected with a plurality of slide rails (8), and the two ends of the top seat (6) are fixedly connected with a first slider (30), and the first slider (30) is slidably connected to the slide rails (8). The end of the top seat (6) near the base (1) is fixedly connected with a first lead screw seat (43), and the first lead screw seat (43) is internally threaded with a lead screw (7).

3. The CNC machining tool for shaft parts according to claim 2, characterized in that: An adjustment groove (42) is provided on the connecting plate (40). A first toothed plate (41) is slidably connected in the adjustment groove (42), and the first toothed plate (41) is fixedly connected to the lifting frame (4). Two second sliders (31) are symmetrically installed on one end of the connecting plate (40) near the base (1), and the second sliders (31) are slidably connected to the slide rail (8).

4. A CNC machining tool for shaft parts according to claim 3, characterized in that: The connecting plate (40) is fixedly connected to a second lead screw seat (44) at one end near the base (1), and the second lead screw seat (44) is internally threaded with a second lead screw (29).

5. A CNC machining tool for shaft parts according to claim 1, characterized in that: The lifting seat (46) is fixedly connected to a limiting ring (47) at one end near the tool holder disc (5), and a second toothed plate (45) is fixedly connected to the other end of the lifting seat (46). Multiple locking rods (51) are evenly fixedly connected to one end of the tool holder disc (5) near the lifting seat (46). Multiple locking grooves (50) are evenly opened on the limiting ring (47), and the locking grooves (50) are adapted to the locking rods (51).

6. A CNC machining tool for shaft parts according to claim 1, characterized in that: A fixed seat (9) is fixedly connected to the upper surface of the base (1). An angular contact ball bearing (17) is fixedly connected inside the fixed seat (9). A main shaft (11) is rotatably connected inside the fixed seat (9). The outer wall of the main shaft (11) is fixedly connected to the inner ring wall of the angular contact ball bearing (17). An oil passage (18) is opened inside the fixed seat (9). An oil pipe (16) is fixedly connected inside the oil passage (18).

7. A CNC machining tool for shaft parts according to claim 6, characterized in that: The upper surface of the base (1) is fixedly connected to an oil storage tank (15), a drive motor (10) and an oil pump (14). The output end of the drive motor (10) is fixedly connected to a toothed pulley (12). A toothed belt (13) is fitted on the toothed pulley (12), and the main shaft (11) is fixedly connected to the chuck disc (3).

8. A CNC machining tool for shaft parts according to claim 7, characterized in that: The oil storage tank (15) and the oil pump (14) are connected by an oil pipe (16), and a worm gear (20) is fixedly connected to one end of the adjusting plate (21) near the main shaft (11).

9. A CNC machining tool for shaft parts according to claim 1, characterized in that: The slide (23) is fixedly connected to a mounting bracket (26) at one end near the top seat (6). A plug rod (27) is slidably connected on the mounting bracket (26), and the plug rod (27) is adapted to the clamp (24).

10. A CNC machining tool for shaft parts according to claim 1, characterized in that: Multiple tool holders (28) are evenly fixedly connected to one end of the tool holder disc (5) away from the limiting ring (47).

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