Spring pressing device for numerical control lathe

Abstract

The application relates to the technical field of numerical control lathes, in particular to a spring top pressing device of a numerical control lathe, which comprises a base, a storage groove is formed in the left side of the base, a hydraulic rod is installed in the storage groove, the telescopic end of the hydraulic rod penetrates through the right side of the base, a moving seat is fixedly installed at the telescopic end of the hydraulic rod, a supporting frame is installed at the top of the moving seat, the fixed seat is provided with two fixed tubes which are arranged left and right, a fixed tube is fixedly installed at the right side of the fixed seat, four slot mouths are circularly arranged on the side wall of the fixed tube, an adjusting tube is movably inserted at the right end of the fixed tube, four sliders are circularly arranged on the left end outer wall of the adjusting tube, the four sliders are slidably installed in the corresponding slot mouths, a moving ring is arranged outside the fixed tube, and the ends, away from the adjusting tube, of the four sliders are connected with the inner wall of the moving ring; the front and back segmented cooperative work structure effectively solves the problem that the traditional top pressing device is integrally formed, and the pre-clamping and self-adaptive clamping cannot be considered.

Description

Technical Field

[0001] This invention relates to the field of CNC lathe technology, and in particular to a spring pressing device for a CNC lathe. Background Technology

[0002] When CNC lathes perform turning on shaft-type workpieces, a clamping device is typically required to axially clamp and radially hold the workpiece for positioning, preventing movement and vibration during cutting and ensuring machining accuracy and surface quality. Existing conventional clamping devices are mostly integral structures, relying on a single spring or hydraulic mechanism for clamping. They can only perform simple axial pressure and lack segmented clamping and positioning designs, making it difficult to simultaneously address the needs of workpiece pre-clamping, adaptive clamping, and rear-end positioning.

[0003] Most existing CNC lathes use integrated clamping devices, which cannot achieve segmented collaborative operation. They lack stable pre-clamping of rod-shaped workpieces at the front end and also lack an elastic adaptive clamping mechanism. They cannot flexibly adjust the clamping force according to the actual specifications of the workpiece, which can easily lead to problems such as loose clamping causing machining wobbling or excessive clamping damaging the workpiece surface. At the same time, the rear end does not have a flexible positioning and unloading structure that can be linked, so the unloading step cannot be completed quickly after the workpiece is processed. The unloading process is cumbersome and time-consuming, which seriously affects the continuous machining efficiency of CNC lathes and the quality of finished workpieces. Therefore, this application proposes a spring clamping device for CNC lathes. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a spring pressing device for CNC lathes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a spring pressing device for a CNC lathe, comprising: The base has a storage slot on the left side, and a hydraulic rod is installed in the storage slot. The telescopic end of the hydraulic rod passes through the right side of the base. The movable seat is fixedly installed at the telescopic end of the hydraulic rod, and a support frame is installed on the top of the movable seat. The fixing base has two parts that fit together on the left and right. A fixing tube is fixedly installed on the right side of the fixing base. The side wall of the fixing tube has four slots arranged in a circular array. The adjusting tube is movably inserted into the right end of the fixed tube. Four sliders are installed in a circular array on the outer wall of the left end of the adjusting tube. The four sliders are slidably installed in the corresponding slots. The movable ring is sleeved on the outside of the fixed tube. The ends of the four sliders away from the adjusting tube are all connected to the inner wall of the movable ring, and the bottom end of the movable ring is fixedly connected to the top end of the support frame. The front clamp assembly consists of four sets arranged in a circular array and installed on the right side wall of the regulating tube. The rear-mounted components are provided in two sets and are respectively installed on two fixed bases.

[0006] Optionally, the front clamp assembly includes a lifting plate, a squeezing block, a positioning rod, a fixing rod, and a clamping plate. The side wall of the adjusting tube has four first openings and four second openings in a circular array. The second openings are located to the right of the first openings. The lifting plate is located inside the adjusting tube. The squeezing block is fixedly installed on the top left end of the lifting plate, and the top of the squeezing block passes through the first opening. The fixing rod is fixedly installed in the second opening, and a rod groove is opened at the bottom end of the fixing rod. The positioning rod is fixedly installed on the top right end of the lifting plate, and the top of the positioning rod is movably inserted into the rod groove. A first spring is fixedly connected between the top of the positioning rod and the rod groove. The clamping plate is located below the lifting plate. Anti-detachment guide rods are installed at the four corners of the top of the clamping plate. Through holes are opened at the four corners of the lifting plate. The four anti-detachment guide rods pass through the corresponding through holes. A second spring is fixedly connected between the top of each of the four anti-detachment guide rods and the lifting plate.

[0007] Optionally, a baffle is fixedly installed on the top of the lifting plate, with the top of the baffle in close contact with the inner wall of the adjusting pipe. The bottom of the clamping plate is arc-shaped, and an anti-slip layer is fixedly installed on the bottom of the clamping plate. The top of the extrusion block and the corner near the fixed pipe are set as slopes. The inner wall of the right end of the fixed pipe has four extrusion grooves in a circular array. The top of each of the four extrusion grooves is set as a slope that matches the slope of the top slope of the extrusion block, and the positions of the four extrusion grooves correspond to the positions of the four extrusion blocks.

[0008] Optionally, the top of the side wall of the positioning rod is provided with four first ball grooves in a circular array, each of which is provided with a first ball. The upper half of the side wall of the positioning rod is provided with four first sliding grooves in a circular array, and the bottom of the inner wall of the rod groove is provided with four second ball grooves in a circular array, each of which is provided with a second ball. The inner wall of the rod groove is provided with four second sliding grooves in a circular array. The four first balls are respectively engaged with the corresponding second slide grooves, and the four second balls are respectively engaged with the corresponding first slide grooves.

[0009] Optionally, a first bearing seat is fixedly installed on the top and bottom of both sides of the fixed seat, and a second bearing seat is installed at both ends of the top of the fixed seat. Two vertically symmetrical and through-hole movable slots are opened on the side of the fixed seat, and a bottom slot communicating with the lower movable slot is opened on the top of the fixed seat.

[0010] Optionally, the rear fixing component includes a double-threaded screw, a transmission rod, a first motor, and a rubber roller. Two double-threaded screws are provided, and the two double-threaded screws are respectively installed between two first bearing seats on the same side of the fixing seat. A first bevel gear is installed at the top of each double-threaded screw. The transmission rod is installed between two second bearing seats on the top of the fixing seat, and a second bevel gear is installed at both ends of the transmission rod. The two second bevel gears are respectively meshed with the two first bevel gears. A first gear is fixedly sleeved in the middle of the transmission rod. The first motor is installed on the top of the fixing seat, and a second gear that meshes with the first gear is fixedly installed at the output end of the first motor. Moving blocks are threaded on the positive and negative threads of the two double-threaded screws. Four moving blocks extend into the two ends of the two moving slots respectively. A rod shaft is rotatably inserted between the two moving blocks in the same moving slot. Two rubber rollers are provided and are respectively fixedly sleeved on the two rod shafts. A frame located in a bottom groove is installed between the bottom of the two moving blocks. A channel is opened in the horizontal and vertical part of the frame. A second motor is installed at the bottom of the frame. A sprocket is installed at the output end of the second motor and at one end of the lower rod shaft. A chain that passes through the channel is sleeved between the two sprockets.

[0011] Optionally, the rear fixing components on the two fixing seats have the same structure, and the two fixing seats and the corresponding rear fixing components are arranged in a staggered pattern, one vertically and one horizontally.

[0012] The beneficial effects of this invention are: By adopting a front and rear segmented collaborative operation structure, the problem of traditional top pressing devices being integrated as a whole and unable to take into account both pre-clamping and adaptive clamping is effectively solved. The four front clamping components adopt a first spring and a second elastic adaptive design, combined with inclined extrusion drive and arc anti-slip clamping plate, which can adaptively adjust the clamping force according to the actual specifications of shaft-type workpieces. This avoids both excessively loose clamping that causes machining shaking and excessively tight clamping that damages the workpiece surface, significantly improving the stability of workpiece radial positioning and machining accuracy, and making up for the adaptability shortcomings of a single top pressing mechanism.

[0013] By relying on hydraulic drive and slider sliding, precise displacement control of the adjusting tube and front clamping assembly is achieved. The extrusion block is squeezed by the extrusion groove on the fixed tube, which drives the lifting plate and clamping plate to properly clamp the workpiece. The two sets of rear fixed components with cross-shaped rear end adopt a double-threaded screw linkage and rubber roller flexible positioning structure (four rubber rollers are distributed in an alternating manner around the rear end of the workpiece). After processing, the workpiece can be unloaded quickly, simplifying the part removal process, shortening auxiliary time, and effectively improving the continuous processing efficiency of CNC lathe. Attached Figure Description

[0014] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure connecting the fixed base, fixed tube, adjusting tube and movable base of the present invention; Figure 3 This is a schematic diagram of the structure of the base, movable seat, fixed tube and adjusting tube of the present invention. Figure 4 This is a schematic diagram of the structure connecting the fixing tube and the adjusting tube to the front clamp assembly of the present invention; Figure 5 This is a cross-sectional structural diagram of the front clamp assembly of the present invention; Figure 6 This is a schematic diagram of the connection between the fixing base and the rear fixing component of the present invention; Figure 7 This is a cross-sectional structural diagram of the connection between the fixing base and the rear fixing component of the present invention; Figure 8 This is a schematic diagram of the connection between the moving block, the rubber roller, and the second motor in this invention. In the picture: 11. Base; 12. Hydraulic rod; 13. Movable seat; 14. Support frame; 111. Storage tray; 21. Fixed base; 22. Fixed tube; 23. Adjusting tube; 24. Moving ring; 211. First bearing housing; 212. Second bearing housing; 213. Through port; 214. Moving groove; 215. Bottom groove; 221. Groove opening; 222. Extrusion groove; 231. Slider; 232. First opening; 233. Second opening; 4. Front clamp assembly; 41. Lifting plate; 42. Enclosure; 43. Extrusion block; 44. Positioning rod; 45. Fixing rod; 46. First spring; 47. Clamping plate; 48. Anti-detachment guide rod; 49. Second spring; 411. Through hole; 441. First ball bearing; 442. First groove; 451. Rod groove; 452. Second ball bearing; 453. Second groove; 5. Post-determined components; 51. Double-threaded screw; 52. First bevel gear; 53. Transmission rod; 54. Second bevel gear; 55. First gear; 56. First motor; 57. Second gear; 58. Moving block; 59. Shaft; 510. Rubber roller; 511. Frame; 512. Second motor; 513. Sprocket; 514. Chain. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0016] Please see Figures 1-8 This invention provides a technical solution: a spring pressing device for a CNC lathe, comprising a base 11, a storage groove 111 on the left side of the base 11, a hydraulic rod 12 installed in the storage groove 111, the telescopic end of the hydraulic rod 12 passing through the right side of the base 11, a movable seat 13 fixedly installed on the telescopic end of the hydraulic rod 12, a support frame 14 installed on the top of the movable seat 13, two fixed seats 21 arranged side to side, a fixed tube 22 fixedly installed on the right side of the fixed seat 21, the side wall of the fixed tube 22 having four slots 221 arranged in a circular array, and an adjusting tube 23 movable. The movable plug is connected to the right end of the fixed tube 22. Four sliders 231 are installed in a circular array on the outer wall of the left end of the adjusting tube 23. The four sliders 231 are slidably installed in the corresponding slots 221. The movable ring 24 is sleeved on the outside of the fixed tube 22. The ends of the four sliders 231 away from the adjusting tube 23 are all connected to the inner wall of the movable ring 24. The bottom end of the movable ring 24 is fixedly connected to the top end of the support frame 14. The front clamp assembly 4 is provided with four sets and is installed in a circular array on the right side wall of the adjusting tube 23. The rear fixed assembly 5 is provided with two sets and is installed on two fixed seats 21 respectively. The complete structure consists of a base 11, a hydraulic rod 12, a movable seat 13, a fixed seat 21, a fixed tube 22, an adjusting tube 23, a movable ring 24, a front clamping assembly 4, and a rear fixed assembly 5. The hydraulic rod 12 drives the movable seat 13 to achieve displacement adjustment. The slider 231 and the movable ring 24 work together to ensure precise movement. The front and rear segmented collaborative operation design solves the problem that traditional devices cannot take into account pre-clamping, adaptive clamping, and rear-end positioning. It realizes the separation and coordination of front-end clamping and positioning and rear-end support and unloading functions, providing a stable and reliable overall structural support for the turning of shaft-type workpieces.

[0017] like Figure 4 and Figure 5As shown, the front clamping assembly 4 includes a lifting plate 41, a pressing block 43, a positioning rod 44, a fixing rod 45, and a clamping plate 47. The side wall of the adjusting tube 23 has four first openings 232 and four second openings 233 arranged in a circular array. The second openings 233 are located to the right of the first openings 232. The lifting plate 41 is disposed inside the adjusting tube 23. The pressing block 43 is fixedly installed on the top left end of the lifting plate 41, and the top end of the pressing block 43 passes through the first opening 232. The fixing rod 45 is fixedly installed in the second opening 233, and a rod groove 4 is provided at the bottom end of the fixing rod 45. 51. The positioning rod 44 is fixedly installed on the top right end of the lifting plate 41, and the top end of the positioning rod 44 is movably inserted into the rod groove 451. A first spring 46 is fixedly connected between the top end of the positioning rod 44 and the rod groove 451. The clamping plate 47 is set below the lifting plate 41. Anti-detachment guide rods 48 are installed at the four corners of the top of the clamping plate 47. Through holes 411 are opened at the four corners of the lifting plate 41. The four anti-detachment guide rods 48 pass through the corresponding through holes 411 respectively. A second spring 49 is fixedly connected between the top end of the four anti-detachment guide rods 48 and the lifting plate 41. The first spring 46 and the second spring 49 form a double-layer elastic adaptive mechanism. The clamping action is achieved by the inclined plane extrusion drive. The anti-disengagement guide rod 48 ensures accurate motion guidance. The clamping stroke and force can be adaptively adjusted according to the actual diameter of the workpiece. This ensures firm radial positioning and prevents machining wobbling. It also avoids damage to the workpiece surface by rigid clamping with flexible buffering, greatly improving clamping adaptability and machining safety.

[0018] like Figure 4 and Figure 5 As shown, a barrier 42 is fixedly installed on the top of the lifting plate 41. The top of the barrier 42 is in close contact with the inner wall of the adjusting pipe 23. The bottom of the clamping plate 47 is arc-shaped, and an anti-slip layer is fixedly installed on the bottom of the clamping plate 47. The top of the extrusion block 43 and the corner near the fixed pipe 22 are set as inclined surfaces. The inner wall of the right end of the fixed pipe 22 has four extrusion grooves 222 in a circular array. The top of each of the four extrusion grooves 222 is set as an inclined surface that matches the slope of the top inclined surface of the extrusion block 43. The positions of the four extrusion grooves 222 correspond to the positions of the four extrusion blocks 43. The enclosure 42 prevents cutting chips from entering the interior and affecting operation. The use of arc-shaped clamping plates 47 and anti-slip layers improves the fit and friction with the workpiece. The extrusion block 43 and extrusion groove 222 are set as matching inclined surfaces, making the extrusion transmission smoother and more efficient, and the clamping force distribution more uniform. This not only improves clamping stability and positioning accuracy, but also protects the workpiece surface from scratches, adapting to the high-precision machining needs of various specifications of shaft workpieces.

[0019] like Figure 5As shown, the top of the side wall of the positioning rod 44 has four first ball grooves arranged in a circular array, each of which is provided with a first ball 441. The upper half of the side wall of the positioning rod 44 has four first sliding grooves 442 arranged in a circular array. The bottom of the inner wall of the rod groove 451 has four second ball grooves arranged in a circular array, each of which is provided with a second ball 452. The inner wall of the rod groove 451 has four second sliding grooves 453 arranged in a circular array. The four first ball bearings 441 are respectively engaged in rolling contact with the corresponding second slide grooves 453, and the four second ball bearings 452 are respectively engaged in rolling contact with the corresponding first slide grooves 442; By setting a first ball bearing 441, a second ball bearing 452, and corresponding first and second sliding grooves 442 and 453 between the positioning rod 44 and the rod groove 451, sliding friction is changed to rolling friction, which greatly reduces the resistance when the positioning rod 44 extends and retracts, making the front clamp assembly 4 respond faster and run more smoothly, effectively avoiding problems such as jamming and deviation, while ensuring accurate extension and retraction direction and uniform force, reducing component wear, extending the service life of core components such as the first spring 46 and the positioning rod 44, and improving the long-term operational stability and durability of the device.

[0020] like Figure 6 and Figure 7 As shown, the top and bottom of both sides of the fixed base 21 are fixedly installed with first bearing seats 211, and the top two ends of the fixed base 21 are installed with second bearing seats 212. The fixed base 21 has two vertically symmetrical moving grooves 214 with through openings 213 on its side, and the top of the fixed base 21 has a bottom groove 215 that communicates with the lower moving grooves 214. Multiple sets of first bearing seats 211, second bearing seats 212, symmetrical moving grooves 214 and connecting bottom grooves 215 are configured to provide standardized installation space and clear running trajectory for the rear fixed component 5, ensuring that components such as double-threaded screw 51 and transmission rod 53 are firmly installed and move accurately. The overall structure is compact and reasonable with high space utilization, providing a stable and reliable installation and support foundation for the rear linkage positioning, clamping and unloading functions.

[0021] like Figure 6 , Figure 7 and Figure 8As shown, the rear fixing assembly 5 includes a double-grooved screw 51, a transmission rod 53, a first motor 56, and a rubber roller 510. Two double-grooved screws 51 are provided, each installed between two first bearing seats 211 on the same side of the fixing base 21. A first bevel gear 52 is installed at the top of each double-grooved screw 51. The transmission rod 53 is installed between two second bearing seats 212 at the top of the fixing base 21, and second bevel gears 54 are installed at both ends of the transmission rod 53. The two second bevel gears 54 mesh with the two first bevel gears 52 respectively. Next, a first gear 55 is fixedly sleeved in the middle of the transmission rod 53, a first motor 56 is mounted on the top of the fixed base 21, and a second gear 57 that meshes with the first gear 55 is fixedly installed at the output end of the first motor 56. Moving blocks 58 are threaded on the positive and negative threads of the two double-threaded screws 51. The four moving blocks 58 extend into the two ends of the two moving slots 214 respectively. A rod shaft 59 is rotatably inserted between the two moving blocks 58 in the same moving slot 214. Two rubber rollers 510 are provided and fixedly sleeved on the two rod shafts 59 respectively. A frame 511 located in the bottom groove 215 is installed between the bottom of the two moving blocks 58 located below. The horizontal and vertical parts of the frame 511 have a channel. A second motor 512 is installed at the bottom of the frame 511. A sprocket 513 is installed at the output end of the second motor 512 and at one end of the lower rod shaft 59. A chain 514 with a through channel is sleeved between the two sprockets 513. The rear positioning component 5 uses a transmission rod 53 to synchronously drive two double-grooved screws 51 to open and close multiple rubber rollers 510, which can quickly adjust the spacing to adapt to workpieces of different sizes. In conjunction with the second motor 512, sprocket 513 and chain 514, the rubber rollers 510 are actively driven, which also has the functions of flexible positioning and unloading. The flexible contact of the rubber rollers 510 avoids scratching the workpiece. After processing, the second motor 512 is controlled to drive one of the rubber rollers 510 to rotate. Through the friction between this rubber roller 510 and the workpiece, the workpiece can be moved backward, which can quickly unload the material, simplify the part removal process, shorten the auxiliary time, and significantly improve the continuous processing efficiency of CNC lathes.

[0022] like Figure 1 and Figure 2 As shown, the rear fixing components 5 on the two fixing seats 21 have the same structure, and the two fixing seats 21 and the corresponding rear fixing components 5 are arranged in a staggered manner, one vertically and one horizontally. The two sets of fixed seats 21 and the rear fixed component 5 are arranged in a staggered pattern, one longitudinal and one transverse, so that the rubber roller 510 forms a multi-directional ring support, which constrains the rear end of the workpiece from multiple directions, effectively suppressing radial movement and vibration during processing, and greatly improving the workpiece processing accuracy and surface quality. The staggered layout does not interfere with the unloading action, and takes into account both positioning stability and high discharge efficiency, making it especially suitable for batch continuous processing scenarios of high-precision shaft-type workpieces.

[0023] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A spring pressing device for a CNC lathe, characterized in that, include: The base (11) has a storage slot (111) on the left side, and a hydraulic rod (12) is installed in the storage slot (111). The telescopic end of the hydraulic rod (12) passes through the right side of the base (11). The movable seat (13) is fixedly installed at the telescopic end of the hydraulic rod (12), and a support frame (14) is installed on the top of the movable seat (13). The fixing base (21) has two parts that fit together on the left and right sides. A fixing tube (22) is fixedly installed on the right side of the fixing base (21). The side wall of the fixing tube (22) has four slots (221) arranged in a circular array. The regulating tube (23) is movably inserted into the right end of the fixed tube (22). Four sliders (231) are installed in a circular array on the outer wall of the left end of the regulating tube (23). The four sliders (231) are slidably installed in the corresponding slots (221). The movable ring (24) is sleeved on the outside of the fixed tube (22). The ends of the four sliders (231) away from the adjusting tube (23) are all connected to the inner wall of the movable ring (24), and the bottom end of the movable ring (24) is fixedly connected to the top end of the support frame (14). The front clamp assembly (4) is provided with four sets arranged in a circular array and installed on the right side wall of the regulating tube (23); The rear fixed component (5) is provided with two sets and is installed on two fixed seats (21) respectively.

2. The spring pressing device for a CNC lathe according to claim 1, characterized in that, The front clamp assembly (4) includes a lifting plate (41), a pressing block (43), a positioning rod (44), a fixing rod (45), and a clamping plate (47). The side wall of the adjusting tube (23) has four first openings (232) and four second openings (233) arranged in a circular array. The second openings (233) are located to the right of the first openings (232). The lifting plate (41) is disposed inside the adjusting tube (23). The pressing block (43) is fixedly installed on the top left end of the lifting plate (41), and the top end of the pressing block (43) penetrates through the first opening (232). The fixing rod (45) is fixedly installed inside the second opening (233), and a rod is provided at the bottom end of the fixing rod (45). The positioning rod (44) is fixedly installed on the top right end of the lifting plate (41), and the top end of the positioning rod (44) is movably inserted into the rod groove (451). A first spring (46) is fixedly connected between the top end of the positioning rod (44) and the rod groove (451). The clamping plate (47) is set below the lifting plate (41). Anti-detachment guide rods (48) are installed at the four corners of the top of the clamping plate (47). Through holes (411) are opened at the four corners of the lifting plate (41). The four anti-detachment guide rods (48) pass through the corresponding through holes (411). A second spring (49) is fixedly connected between the top end of the four anti-detachment guide rods (48) and the lifting plate (41).

3. The spring pressing device for a CNC lathe according to claim 2, characterized in that, The top of the lifting plate (41) is fixedly installed with a guardrail (42), the top of the guardrail (42) is in close contact with the inner wall of the adjusting pipe (23), the bottom of the clamping plate (47) is set in an arc shape, and an anti-slip layer is fixedly installed at the bottom of the clamping plate (47). The top of the extrusion block (43) and the corner near the fixed pipe (22) are set as a slope. The inner wall of the right end of the fixed pipe (22) is provided with four extrusion grooves (222) in a circular array. The top of the four extrusion grooves (222) is set as a slope that matches the slope of the top slope of the extrusion block (43), and the positions of the four extrusion grooves (222) correspond to the positions of the four extrusion blocks (43).

4. The spring pressing device for a CNC lathe according to claim 2, characterized in that, The top of the side wall of the positioning rod (44) is provided with four first ball grooves in a circular array, each of which is provided with a first ball (441). The upper half of the side wall of the positioning rod (44) is provided with four first sliding grooves (442) in a circular array. The bottom of the inner wall of the rod groove (451) is provided with four second ball grooves in a circular array, each of which is provided with a second ball (452). The inner wall of the rod groove (451) is provided with four second sliding grooves (453) in a circular array. The four first balls (441) are respectively engaged in rolling contact with the corresponding second grooves (453), and the four second balls (452) are respectively engaged in rolling contact with the corresponding first grooves (442).

5. The spring pressing device for a CNC lathe according to claim 1, characterized in that, The top and bottom of both sides of the fixed seat (21) are fixedly installed with first bearing seats (211), and second bearing seats (212) are installed at both ends of the top of the fixed seat (21). The fixed seat (21) has two vertically symmetrical moving slots (214) with through openings (213) on its side, and the top of the fixed seat (21) has a bottom slot (215) that communicates with the lower moving slots (214).

6. The spring pressing device for a CNC lathe according to claim 5, characterized in that, The rear fixing assembly (5) includes a double-grooved screw (51), a transmission rod (53), a first motor (56), and a rubber roller (510). Two double-grooved screws (51) are provided, each installed between two first bearing seats (211) on the same side of the fixing base (21), and each double-grooved screw (51) has a first bevel gear (52) installed at its top. The transmission rod (53) is installed between two second bearing seats (212) at the top of the fixing base (21), and each transmission rod (53) has a second bevel gear (54) installed at both ends. The two second bevel gears (54) mesh with the two first bevel gears (52) respectively. Next, a first gear (55) is fixedly sleeved in the middle of the transmission rod (53), the first motor (56) is installed on the top of the fixed seat (21), and a second gear (57) that meshes with the first gear (55) is fixedly installed at the output end of the first motor (56). Moving blocks (58) are threaded on the positive and negative threads of the two double-threaded screws (51). The four moving blocks (58) extend to the two ends of the two moving slots (214) respectively. A rod shaft (59) is rotatably inserted between the two moving blocks (58) in the same moving slot (214). Two rubber rollers (510) are provided and fixedly sleeved on the two rod shafts (59) respectively. A frame (511) located in the bottom groove (215) is installed between the bottom of the two moving blocks (58) below. A channel is opened in the horizontal part of the frame (511). A second motor (512) is installed at the bottom of the frame (511). A sprocket (513) is installed at the output end of the second motor (512) and at one end of the lower rod shaft (59). A chain (514) passing through the channel is sleeved between the two sprockets (513).

7. The spring pressing device for a CNC lathe according to claim 6, characterized in that, The rear fixing components (5) on the two fixing seats (21) have the same structure, and the two fixing seats (21) and the corresponding rear fixing components (5) are arranged in a staggered manner, one vertically and one horizontally.

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