Double-end numerical control lathe capable of automatically feeding and discharging

Abstract

The invention relates to the technical field of numerical control lathes, in particular to an automatic feeding and discharging double-end numerical control lathe which comprises a base and a protective cover fixedly connected to the top of the base, an electric door is arranged on the protective cover, a pair of turning tool fixing frames are arranged at the top of the base, and a fixing plate is connected to the top of the base and located between the turning tool fixing frames through bolts. A top plate is fixedly connected to the top end of the front side of the base, a bottom block is fixedly connected to the top of the top plate, a storage hopper is fixedly connected to the top of the bottom block, sliding grooves are formed in the top of the top plate and the top of the base, and sliding blocks are slidably connected to the inner sides of the sliding grooves. Through mutual cooperation of the driving mechanism, the pushing frame, the feeding mechanism and other structures, the double-head clamping base can be automatically pulled out, then a workpiece to be machined is pushed into the double-head clamping base, meanwhile, the machined workpiece is pushed out, automatic feeding and discharging of the device are completed, manual feeding and discharging are not needed, and the convenience performance of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of CNC lathes, in particular to a double-head CNC lathe with automatic loading and unloading. Background Art

[0002] CNC lathes are mainly used for cutting inner and outer cylindrical surfaces of shaft parts or disk parts, inner and outer conical surfaces of arbitrary taper angles, complex rotating inner and outer curved surfaces, and cylindrical and conical threads, and can perform grooving, drilling, reaming, reaming and boring, etc. The double-head CNC lathe mainly improves the processing efficiency by setting a two-way clamp in the middle of the machine tool, leaving both ends of the workpiece exposed, and using two tools to process both ends of the workpiece at the same time, while reducing the number of repeated clamping of the workpiece to ensure the processing accuracy of the workpiece.

[0003] A CNC double-head lathe with publication number CN113787200A in the prior art performs cutting movements through a first tool holder, a second tool holder and the tools on the tool holders, thereby quickly completing the cutting processing on both sides of the workpiece and improving the cutting effect. At the same time, both the first tool holder and the second tool holder can move along a first direction and a second direction, so that they can be conveniently moved to the position where processing is required, further improving the processing efficiency. In addition, the rear end of the working table of the lathe body is raised and inclined to the ground, so that the specific situation can be observed during processing.

[0004] However, there are still some defects in the actual processing process. Since the double-head CNC lathe lacks an automatic loading and unloading mechanism, workers are required to take out the workpiece and put in a new workpiece after the workpiece is processed. This is not only time-consuming and labor-intensive, but also the surface temperature of the newly processed workpiece is high, which can easily scald the workers, posing certain safety hazards and reducing the convenience of the device.

[0005] Therefore, a double-head CNC lathe with automatic loading and unloading is proposed to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and propose a double-head CNC lathe with automatic loading and unloading.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a double-head CNC lathe with automatic loading and unloading, comprising a base, and a protective cover fixedly connected to the top of the base, an electric door is provided on the protective cover, a pair of turning tool fixing frames are provided on the top of the base, a fixing plate is bolted to the top of the base and located between the turning tool fixing frames, a double-head clamp is slidably connected to the top of the fixing plate, a top plate is fixedly connected to the top of the front side of the base, a bottom block is fixedly connected to the top of the top plate, a storage hopper is fixedly connected to the top of the bottom block, and slide grooves are provided on the top plate and the top of the base. The top of the top plate is fixedly connected with a frame placing platform, and the bottom of both sides of the storage hopper are provided with openings, and the bottom of the bottom block is provided with a moving groove, and the inside of the moving groove is slidably connected with a moving seat, and the inside of the moving seat is hinged with a push plate, and the bottom of the push plate side wall is obliquely fixedly connected with a side plate, and the bottom block is provided with a feeding mechanism for the sliding block to pull the moving seat to move.

[0008] In the above technical solution, further, the bottom of the side plate is abutted against the top of the movable seat, an upper spring is fixedly connected between the top of the movable seat and the bottom of the side plate, the top of the bottom block is fixedly connected with a support plate, and a return spring is fixedly connected between the support plate and the double-head clamp seat.

[0009] In the above technical scheme, further, the feeding mechanism includes a spiral spring, a pair of circular plates are fixedly connected to the side wall of the bottom block, a winding ring is rotatably connected between the circular plates, a pull rope is wrapped around the outer wall of the winding ring, one end of the pull rope is fixedly connected to the outer wall of the winding ring, the outer wall of the movable seat is fixedly connected to the outer wall of the pull rope, the spiral spring is arranged on the inner side of the winding ring, one end of the spiral spring is fixedly connected to the inner side of the winding ring, the other end of the spiral spring is fixedly connected to the side wall of the circular plate, a moving cavity is opened inside the top plate and is connected to the slide groove, a displacement plate is slidably connected to the inner side of the slide groove, and the other end of the pull rope passes through the moving cavity and is fixedly connected to the side wall of the displacement plate.

[0010] In the above technical solution, further, a plurality of guide rollers are rotatably connected to the inner side of the movable cavity, and the pull ropes all pass through the outer walls of the plurality of guide rollers.

[0011] In the above technical solution, further, a pair of L-shaped plates for limiting the movement of the double-head clamp seat are fixedly connected to the top of the top plate, a limiting plate is fixedly connected to the top of the base and away from the side of the L-shaped plate, and a bottom opening is opened at the bottom of the side wall of the electric door.

[0012] In the above technical solution, further, the driving mechanism includes a driving motor, a reciprocating screw is rotatably connected to the inner side of the slide groove, the reciprocating screw is threadedly connected to the inner wall of the sliding block, the driving motor is fixedly connected to the front side of the top plate, and the output end of the driving motor passes through the inner side of the top plate and is fixedly connected to the side wall of the reciprocating screw.

[0013] In the above technical scheme, further, the side wall of the sliding block is fixedly connected with a right-angle block through an extension rod, the top of the frame placing platform is slidably connected with a placing plate, the inner side of the frame placing platform is fixedly connected with a positioning plate, the side wall of the positioning plate is rotatably connected with a round block, the side wall of the round block passes through the positioning plate and is fixedly connected with a gear, the side wall of the frame placing platform passes through a rack that is slidably connected to the gear, the outer wall of the round block is respectively provided with a pair of vertical grooves and a pair of arc-shaped oblique grooves, the two ends of the arc-shaped oblique grooves are connected with the two ends of two adjacent vertical grooves, a rectangular frame is slidably connected with the top of the top plate and located on the outside of the round block, a straight rod is slidably connected with the top of the rectangular frame, the bottom of the straight rod is inserted into the inner side of the vertical groove, and the bottom of the vertical groove near one end of the rectangular frame is provided with an inward groove, and a connecting frame is fixedly connected between the rack and the side wall of the placing plate.

[0014] In the above technical solution, further, the connection between the groove and the arc-shaped bevel groove is inclined, a lower spring is fixedly connected between the top of the rectangular frame and the outer wall of the straight rod, a pair of extrusion springs are fixedly connected between the side wall of the rectangular frame and the side wall of the positioning plate, and the bottom end of the straight rod is set to a smooth arc surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can automatically pull out the double-head clamp through the cooperation of the driving mechanism, the pushing frame and the feeding mechanism, and then push the workpiece to be processed into the double-head clamp, and at the same time push out the processed workpiece, thereby completing the automatic loading and unloading of the device, and there is no need for workers to load and unload, thereby improving the convenience of the device.

[0016] 2. The present invention can automatically push the material box to move before each loading and unloading through the mutual cooperation of structures such as right-angle blocks, round blocks and straight rods, and push the material box away from the position where the workpiece was last placed, further improving the automation of loading and unloading of the device and improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front three-dimensional structural schematic diagram of the CNC lathe of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the CNC lathe of the present invention when viewed from top; Figure 3 It is a schematic diagram of the overall appearance structure of the top plate and the double-head clamp seat of the present invention; Figure 4 The appended Figure 2 A schematic diagram of the partially enlarged structure at center A; Figure 5 It is a schematic diagram of the rear-view full-section three-dimensional structure of the top plate of the present invention; Figure 6 The appended Figure 5 A schematic diagram of the partially enlarged structure at B in the middle; Figure 7 It is a schematic diagram of a partial top view and a full cutaway three-dimensional structure of the top plate of the present invention; Figure 8 It is a schematic diagram of the overall appearance structure of the frame placing table of the present invention; Fig. 9 This is a schematic diagram of the overall appearance structure of the round block and rectangular frame of the present invention; Fig.10 It is a schematic diagram of the overall appearance structure of the round block of the present invention.

[0018] In the figure: 1, base; 2, protective cover; 3, electric door; 4, turning tool fixing frame; 5, fixing plate; 6, double-head clamping seat; 7, top plate; 8, bottom block; 9, storage hopper; 10, slide; 11, sliding block; 12, push frame; 13, frame placing table; 14, opening; 15, moving seat; 16, push plate; 17, side plate; 18, upper spring; 19, support plate; 20, reset spring; 21, scroll spring; 22, round plate; 23, winding ring; 24 , pull rope; 25, displacement plate; 26, guide roller; 27, L-shaped plate; 28, limit plate; 29, drive motor; 30, reciprocating screw; 31, right-angle block; 32, placement plate; 33, positioning plate; 34, round block; 35, gear; 36, rack; 37, vertical groove; 38, arc-shaped inclined groove; 39, rectangular frame; 40, straight rod; 41, groove; 42, lower spring; 43, extrusion spring; 44, connecting frame; 45, bottom mouth; 46, extension rod. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-10The double-head CNC lathe with automatic loading and unloading shown in the figure comprises a base 1 and a protective cover 2 fixedly connected to the top of the base 1, an electric door 3 is arranged on the protective cover 2, a pair of turning tool fixing frames 4 are arranged on the top of the base 1, a fixing plate 5 is bolted to the top of the base 1 and located between the turning tool fixing frames 4, a double-head clamping seat 6 is slidably connected to the top of the fixing plate 5, the double-head clamping seat 6 has clamping and rotating functions, and can be electrically connected to the double-head clamping seat 6 through a displacement sensor, can automatically release the clamping of the workpiece when the double-head clamping seat 6 moves to the opening 14, and automatically clamp the workpiece when it is moved away, a top plate 7 is fixedly connected to the top of the front side of the base 1, a bottom block 8 is fixedly connected to the top of the top plate 7, a storage hopper 9 is fixedly connected to the top of the bottom block 8, a slide groove 10 is provided on the top of the top plate 7 and the base 1, a sliding block 11 is slidably connected to the inner side of the slide groove 10, a pushing frame 12 for pushing the double-head clamping seat 6 to move is fixedly connected to the top of the sliding block 11, and the inner side of the slide groove 10 is provided with a bottom plate 8, and the bottom plate 8 is provided with a bottom plate 8. A driving mechanism for driving the sliding block 11 to move is provided, a frame placing platform 13 is fixedly connected to the top of the top plate 7 and at one end away from the storage hopper 9, openings 14 are provided at the bottom of both sides of the storage hopper 9, the opening 14 on the side close to the frame placing platform 13 is adapted to the size of the workpiece, and the opening 14 on the side away from the frame placing platform 13 is adapted to the size of the push plate 16 to prevent the workpiece from moving out of the opening 14 on the side away from the frame placing platform 13, a moving groove is provided at the bottom of the bottom block 8, a moving seat 15 is slidably connected to the inner side of the moving groove, a push plate 16 is hingedly connected to the inner side of the moving seat 15, and a side plate 17 is fixedly connected to the bottom of the side wall of the push plate 16 at an angle, a feeding mechanism for the sliding block 11 to pull the moving seat 15 to move is provided on the bottom block 8, and the bottom of the side plate 17 is abutted against the top of the moving seat 15, an upper spring 18 is fixedly connected between the top of the moving seat 15 and the bottom of the side plate 17, a support plate 19 is fixedly connected to the top of the bottom block 8, and a return spring 20 is fixedly connected between the support plate 19 and the double-head clamp seat 6; The feeding mechanism includes a scroll spring 21, a pair of circular plates 22 are fixedly connected to the side wall of the bottom block 8, a winding ring 23 is rotatably connected between the circular plates 22, a pull rope 24 is wound around the outer wall of the winding ring 23, one end of the pull rope 24 is fixedly connected to the outer wall of the winding ring 23, the outer wall of the movable seat 15 is fixedly connected to the outer wall of the pull rope 24, the scroll spring 21 is arranged on the inner side of the winding ring 23, one end of the scroll spring 21 is fixedly connected to the inner side of the winding ring 23, the other end of the scroll spring 21 is fixedly connected to the side wall of the circular plate 22, a moving cavity is opened inside the top plate 7 and is connected to the slide groove 10, a displacement plate 25 is slidably connected to the inner side of the slide groove 10, and the other end of the pull rope 24 passes through the moving cavity and is fixedly connected to the side wall of the displacement plate 25; The driving mechanism includes a driving motor 29, a reciprocating screw rod 30 is rotatably connected to the inner side of the slide slot 10, the reciprocating screw rod 30 is threadedly connected to the inner side wall of the sliding block 11, the driving motor 29 is fixedly connected to the front side of the top plate 7, and the output end of the driving motor 29 passes through the inner side of the top plate 7 and is fixedly connected to the side wall of the reciprocating screw rod 30; Before processing, the processed material box is placed on the placement plate 32, and the workpiece to be processed is neatly placed in the storage hopper 9, and then the workpiece will slide to the opening 14 under its own gravity. Then, when processing, the drive motor 29 is first controlled to start and drive the reciprocating screw 30 to rotate, thereby driving the threaded sliding block 11 to slide inside the slide groove 10, thereby driving the push frame 12 to move, and then gradually release the thrust on the double-head clamp seat 6, and then pull the double-head clamp seat 6 to the side of the top plate 7 under the elastic force of the return spring 20. Then, when the center position of the double-head clamp seat 6 moves to the opening 14, the double-head clamp seat 6 can be controlled to open, and then the double-head clamp seat 6 is restricted from continuing to slide by the L-shaped plate 27. Then, the sliding block 11 continues to slide, which pushes the displacement plate 25 to move, thereby pulling the pull rope 24 to drive the moving seat 15 to slide in the moving groove, and at the same time, the reeled part of the pull rope 24 on the reeling ring 23 is pulled out. Since the other end of the pull rope 24 is fixed on the reeling ring 23, the movement of the pull rope 24 drives the reeling ring 23 to rotate at the same time; And because one end of the spiral spring 21 is fixed on the winding ring 23 and the other end is fixed on the circular plate 22, the spiral spring 21 will be gradually compressed by the rotation of the winding ring 23, so that the push plate 16 is driven to move by the movement of the moving seat 15. At this time, the side plate 17 of the side wall of the push plate 16 will be restrained by the top of the moving seat 15, so that the push plate 16 will pass through the opening 14 to push the workpiece at the lowest end of the storage hopper 9 to move, so that the workpiece passes through the opening 14 and is inserted into the double-head clamp seat 6 (during subsequent loading and unloading, the workpiece processed in the original double-head clamp seat 6 will be ejected and pushed into the material box on the frame table 13), and then the push plate 16 passes through the opening 14 at the other end, and the workpiece is completely inserted into the double-head clamp seat 6. At this time, the workpiece stored in the storage hopper 9 will fall into the position where the workpiece was originally pushed out under its own gravity; Then the sliding block 11 moves to the end of the reciprocating screw 30, and then the sliding block 11 is driven to move in the opposite direction to reset under the action of the reciprocating screw 30. At this time, the double-head clamping seat 6 can be controlled to start to clamp the workpiece, and at the same time, the thrust on the displacement plate 25 is gradually released. The pull rope 24 is gradually wound under the pulling force of the spiral spring 21, and then the moving seat 15 is gradually pulled to reset. When the push plate 16 moves to the opening 14, it will be hindered by the fallen workpiece. Since there is no restriction on the other side of the push plate 16, the push plate 16 will rotate around the hinge. Thereby, the top end of the push plate 16 is rotated into the moving groove, and the side plate 17 is driven to flip and stretch the upper spring 18. Then the sliding block 11 and the pushing frame 12 are moved to the side of the double-head clamp seat 6. At this time, the push plate 16 on the moving seat 15 moves out from under the storage hopper 9, and then loses the resistance of the workpiece. Subsequently, under the elastic force of the upper spring 18, the side plate 17 and the push plate 16 are pulled to rotate and reset. Finally, the pushing frame 12 pushes the double-head clamp seat 6 to move and reset on the base 1, and at the same time stretches the reset spring 20, pushes the double-head clamp seat 6 back and closes the electric door 3.

[0022] In order to increase the service life of the device, a number of guide rollers 26 are rotatably connected to the inner side of the movable cavity, and the pull ropes 24 pass through the outer walls of the guide rollers 26. The setting of the guide rollers 26 can not only guide the movement of the pull ropes 24, but also avoid direct contact between the pull ropes 24 and the corners of the movable cavity to cause wear and affect the service life of the pull ropes 24.

[0023] In order to improve the stability of the device during operation, a pair of L-shaped plates 27 for limiting the movement of the double-head clamp seat 6 are fixedly connected to the top of the top plate 7. Through the setting of the L-shaped plate 27, the moving position of the double-head clamp seat 6 can be limited, thereby ensuring that the double-head clamp seat 6 is aligned with the opening 14, thereby ensuring normal loading and unloading of the device. A limiting plate 28 is fixedly connected to the top of the base 1 and away from the side of the L-shaped plate 27. The limiting plate 28 can limit the position of the double-head clamp seat 6 when it is reset, thereby ensuring the accuracy of the workpiece during processing. A bottom opening 45 is opened at the bottom of the side wall of the electric door 3. Through the setting of the bottom opening 45, the electric door 3 can be prevented from being affected by the sliding block 11 and the reset spring 20 when closed, thereby ensuring the stability of the device during operation.

[0024] In order to automatically push the material box to move before loading and unloading each time, the material box is pushed away from the position where the workpiece was placed last time, the side wall of the sliding block 11 is fixedly connected to the right-angle block 31 through the extension rod 46, the top of the frame placing platform 13 is slidably connected to the placing plate 32, the inner side of the frame placing platform 13 is fixedly connected to the positioning plate 33, the side wall of the positioning plate 33 is rotatably connected to the round block 34, the side wall of the round block 34 passes through the positioning plate 33 and is fixedly connected to the gear 35, and the side wall of the frame placing platform 13 is slidably connected to the rack 33 meshing with the gear 35 6. A pair of vertical grooves 37 and a pair of arc-shaped oblique grooves 38 are respectively provided on the outer wall of the round block 34. The two ends of the arc-shaped oblique grooves 38 are connected with the two ends of the adjacent vertical grooves 37. A rectangular frame 39 is slidably connected to the top of the top plate 7 and located on the outer side of the round block 34. A straight rod 40 is slidably connected to the top of the rectangular frame 39. The bottom of the straight rod 40 is inserted into the inner side of the vertical groove 37. The bottom of the vertical groove 37 near the end of the rectangular frame 39 is provided with an inward groove 41. A connecting frame 44 is fixedly connected between the rack 36 and the side wall of the placement plate 32. The connection between the groove 41 and the arc-shaped inclined groove 38 is inclined, a lower spring 42 is fixedly connected between the top of the rectangular frame 39 and the outer wall of the straight rod 40, a pair of extrusion springs 43 are fixedly connected between the side wall of the rectangular frame 39 and the side wall of the positioning plate 33, and the bottom end of the straight rod 40 is set to a smooth arc surface, so that the straight rod 40 can slide out of the groove 41 better, thereby improving the smoothness of the device during operation; When the driving mechanism starts loading and unloading the workpiece, the movement of the sliding block 11 will drive the extension rod 46 and the right-angle block 31 to move at the same time. Before the double-head clamp 6 moves to the side of the storage hopper 9, the right-angle block 31 will first move to the side of the rectangular frame 39, and then through the continued movement of the sliding block 11, the inclined surface of the right-angle block 31 will squeeze the rectangular frame 39 to slide, and compress the squeezing spring 43, while driving the straight rod 40 to move. At this time, the straight rod 40 is located above the groove 41, and the straight rod 40 will be pushed into the groove 41 under the elastic force of the lower spring 42. There is a step between the groove 41 and the vertical groove 37, which is restricted. Therefore, under the thrust of the rectangular frame 39, the straight rod 40 will gradually move toward the arc-shaped inclined groove 38. At this time, since the rectangular frame 39 slides on the top plate 7, the round block 34 will be driven to rotate under the push of the straight rod 40, so that the straight rod 40 gradually slides out of the groove 41 and slides into the arc-shaped inclined groove 38, and gradually squeezes the straight rod 40 upward, stretches the lower spring 42, and drives the gear 35 to rotate, thereby driving the meshing rack 36 to move, and then drives the placement plate 32 on the frame placement table 1 through the connecting frame 44. 3, thereby driving the material box above the placement plate 32 to move, realizing the function of pushing away the position where the workpiece was placed last time, and then the straight rod 40 slides out of the arc-shaped inclined groove 38, and at the same time, the side wall of the extension rod 46 slides to the side wall of the rectangular frame 39, and the support plate 19 will not hinder the movement of the right-angle block 31. Finally, when the sliding block 11 is reset after the loading and unloading is completed, the right-angle block 31 will move away from the side wall of the rectangular frame 39, thereby releasing the extrusion restriction on the rectangular frame 39, and then the rectangular frame 39 is pushed to reset under the elastic force of the extrusion spring 43, and at the same time, the straight rod 40 is driven in the vertical groove 3 7, moves to the top of the groove 41, and then pushes the bottom of the straight rod 40 into the groove 41 under the elastic force of the lower spring 42, and repeats this process, so that the material box can be automatically pushed to move before each loading and unloading, and the position where the material box was last placed on the workpiece is pushed away, further improving the automation of loading and unloading of the device and improving the convenience of the device. When the material box is collected and needs to be replaced with a new one, the straight rod 40 can be pulled upward to slide out of the vertical groove 37, and then the connecting frame 44 can be pulled to drive the rack 36 and the placement plate 32 to reset, so as to release the straight rod 40 and replace the material box.

[0025] The basic principles, main features and advantages of the present invention are shown and described above.

[0026] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A double-head CNC lathe with automatic loading and unloading, comprising a base (1), and a protective cover (2) fixedly connected to the top of the base (1), an electric door (3) being provided on the protective cover (2), and a pair of turning tool fixing frames (4) being provided on the top of the base (1), characterized in that: A fixing plate (5) is bolted to the top of the base (1) and is located between the turning tool fixing frame (4); a double-head clamping seat (6) is slidably connected to the top of the fixing plate (5); a top plate (7) is fixedly connected to the top of the front side of the base (1); a bottom block (8) is fixedly connected to the top of the top plate (7); a storage hopper (9) is fixedly connected to the top of the bottom block (8); a slide groove (10) is provided on the top of the top plate (7) and the base (1); a sliding block (11) is slidably connected to the inner side of the sliding groove (10); a pushing frame (12) for pushing the double-head clamping seat (6) to move is fixedly connected to the top of the sliding block (11). A driving mechanism for driving the sliding block (11) to move is provided inside the sliding groove (10); a frame placing platform (13) is fixedly connected to the top of the top plate (7) and at one end away from the storage hopper (9); openings (14) are provided at the bottom of both sides of the storage hopper (9); a moving groove is provided at the bottom of the bottom block (8); a moving seat (15) is slidably connected to the inside of the moving groove; a push plate (16) is hingedly connected to the inside of the moving seat (15); a side plate (17) is fixedly connected to the bottom of the side wall of the push plate (16) in an inclined manner; and a feeding mechanism is provided on the bottom block (8) for pulling the moving seat (15) to move by the sliding block (11).

2. The double-head CNC lathe with automatic loading and unloading according to claim 1 is characterized in that: The bottom of the side plate (17) abuts against the top of the movable seat (15); an upper spring (18) is fixedly connected between the top of the movable seat (15) and the bottom of the side plate (17); a support plate (19) is fixedly connected to the top of the bottom block (8); and a return spring (20) is fixedly connected between the support plate (19) and the double-head clamp seat (6).

3. The double-head CNC lathe with automatic loading and unloading according to claim 1 is characterized in that: The feeding mechanism comprises a scroll spring (21), a pair of circular plates (22) are fixedly connected to the side wall of the bottom block (8), a winding ring (23) is rotatably connected between the circular plates (22), a pull rope (24) is wound around the outer wall of the winding ring (23), one end of the pull rope (24) is fixedly connected to the outer wall of the winding ring (23), the outer wall of the movable seat (15) is fixedly connected to the outer wall of the pull rope (24), the scroll spring (21) is arranged on the inner side of the winding ring (23), one end of the scroll spring (21) is fixedly connected to the inner side of the winding ring (23), and the other end of the scroll spring (21) is fixedly connected to the side wall of the circular plate (22), a moving cavity is opened inside the top plate (7) and is connected to the slide groove (10), a displacement plate (25) is slidably connected to the inner side of the slide groove (10), and the other end of the pull rope (24) passes through the moving cavity and is fixedly connected to the side wall of the displacement plate (25).

4. The double-head CNC lathe with automatic loading and unloading according to claim 3 is characterized in that: A plurality of guide rollers (26) are rotatably connected to the inner side of the movable cavity, and the pull ropes (24) pass through the outer walls of the plurality of guide rollers (26).

5. The double-head CNC lathe with automatic loading and unloading according to claim 1 is characterized in that: A pair of L-shaped plates (27) for limiting the movement of the double-head clamp seat (6) are fixedly connected to the top of the top plate (7); a limiting plate (28) is fixedly connected to the top of the base (1) and on one side away from the L-shaped plates (27); and a bottom opening (45) is provided at the bottom of the side wall of the electric door (3).

6. The double-head CNC lathe with automatic loading and unloading according to claim 1, characterized in that: The driving mechanism comprises a driving motor (29), a reciprocating screw rod (30) is rotatably connected to the inner side of the slide groove (10), the reciprocating screw rod (30) is threadedly connected to the inner side wall of the sliding block (11), the driving motor (29) is fixedly connected to the front side of the top plate (7), and the output end of the driving motor (29) passes through the inner side of the top plate (7) and is fixedly connected to the side wall of the reciprocating screw rod (30).

7. The double-head CNC lathe with automatic loading and unloading according to claim 1 is characterized in that: The side wall of the sliding block (11) is fixedly connected to a right-angle block (31) via an extension rod (46); the top of the frame placing platform (13) is slidably connected to a placing plate (32); the inner side of the frame placing platform (13) is fixedly connected to a positioning plate (33); the side wall of the positioning plate (33) is rotatably connected to a round block (34); the side wall of the round block (34) passes through the positioning plate (33) and is fixedly connected to a gear (35); the side wall of the frame placing platform (13) is slidably connected to a rack (36) meshing with the gear (35); the outer wall of the round block (34) is respectively provided with a pair of vertical grooves (34). 7) and a pair of arc-shaped inclined grooves (38), the two ends of the arc-shaped inclined grooves (38) are connected to the two ends of the adjacent two vertical grooves (37), a rectangular frame (39) is slidably connected to the top of the top plate (7) and located outside the round block (34), a straight rod (40) is slidably connected to the top of the rectangular frame (39), the bottom of the straight rod (40) is inserted into the inner side of the vertical groove (37), the bottom of the vertical groove (37) near the rectangular frame (39) is provided with an inward groove (41), and a connecting frame (44) is fixedly connected between the rack (36) and the side wall of the placement plate (32).

8. The double-head CNC lathe with automatic loading and unloading according to claim 7, characterized in that: The connection between the groove (41) and the arc-shaped inclined groove (38) is inclined, a lower spring (42) is fixedly connected between the top of the rectangular frame (39) and the outer wall of the straight rod (40), a pair of extrusion springs (43) are fixedly connected between the side wall of the rectangular frame (39) and the side wall of the positioning plate (33), and the bottom end of the straight rod (40) is set to a smooth arc surface.

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