Automatic exchange device for double exchange workbench horizontal machining center

Abstract

The utility model discloses a kind of automatic exchange devices for double-exchange workbench horizontal machining center, including base, workbench exchange mechanism, workbench rotary mechanism and double hydraulic cylinder lifting mechanism.Workbench exchange mechanism adopts servo motor driving gear transmission, improves exchange accuracy and efficiency;Double hydraulic cylinder is symmetrically arranged at the both ends of bridge plate, improves carrying capacity and avoids jamming;Workbench rotary mechanism realizes accurate positioning and oil circuit on-off by positioning cone assembly and quick coupling.The utility model has the advantages of compact structure, exchange stability, chip removal smoothness, high reliability, and is suitable for high-precision numerical control machining center.

Description

Technical Field

[0001] This utility model relates to the technical field of CNC machine tool exchange mechanisms, specifically to an automatic exchange device for a horizontal machining center with a double exchange worktable. Background Technology

[0002] In the field of CNC machine tools, the double-exchange table horizontal machining center has two worktables, one for machining and one for loading, and is equipped with an automatic exchange device to realize the simultaneous clamping and machining of workpieces, which can significantly reduce the waiting time for workpiece clamping and improve the processing utilization rate of the equipment.

[0003] Existing automatic exchange devices mainly use dual hydraulic cylinders and gear rack mechanisms to achieve the exchange action. The disadvantages are: the dual hydraulic cylinders are prone to uneven driving pressure, which can cause the rotary table to jam or even stop; the hydraulic response speed is slow, the accuracy is low, the exchange time is long, and the efficiency is low.

[0004] The existing automatic exchange device's lifting mechanism mainly uses a single hydraulic cylinder drive, and its position is mainly located in the middle of the automatic exchange device. Its disadvantages are: the lifting mechanism uses a single hydraulic cylinder drive, which cannot obtain a large workpiece load-bearing capacity, reducing the load-bearing performance of the horizontal machining center; the lifting mechanism is located in the middle of the device, which will occupy the installation space of the guide rail protective cover, making chip removal in the horizontal machining center very difficult and seriously affecting the reliability of the equipment. Utility Model Content

[0005] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing an automatic exchange device for a horizontal machining center with a double exchange table. This automatic exchange device uses double hydraulic cylinders arranged at both ends of the device for lifting, which can significantly improve the workpiece load-bearing capacity of the horizontal machining center and provide sufficient space for the installation of guide rail protective covers. The rotary mechanism of this automatic exchange device is driven by a servo motor and has the characteristics of stable and reliable structure, short exchange time, and high exchange accuracy.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an automatic exchange device for a horizontal machining center with a double-exchange worktable, the innovation of which lies in comprising: Base; The workbench exchange mechanism includes a bridge plate fixed to the base, a rotary shaft rotatably disposed at the center of the bridge plate, and a drive assembly for driving the rotary shaft to rotate. A worktable rotation mechanism is located above the rotation shaft and is used to install and position the worktable; The dual hydraulic cylinder lifting mechanism includes two hydraulic cylinder assemblies symmetrically arranged at both ends of the bridge plate. The piston end of the hydraulic cylinder assembly is connected to the bridge plate and is used to synchronously drive the bridge plate and the worktable exchange mechanism and the worktable rotation mechanism disposed thereon to lift the entire structure. The drive assembly includes a large gear mounted on the rotary shaft and a small gear driven by a servo motor via a planetary reducer. The small gear meshes with the large gear to form a primary reduction transmission pair.

[0007] Furthermore, the worktable rotation mechanism includes: A rotary table fixed to the top of the rotary shaft; The rotary spindle is mounted on the rotary table and is supported on the worktable base by a thrust ball bearing and an angular contact ball bearing. A rotary seat fixed to the upper end of the rotary spindle is provided with a plurality of positioning cone assemblies for positioning and clamping the worktable.

[0008] Furthermore, the rotating platform is provided with a claw, and the front end of the worktable is provided with a left contact block, a right contact block and a lower contact block, and a hooking space is formed between the left contact block, the right contact block and the lower contact block for the claw to engage.

[0009] Furthermore, the rotary spindle is a hollow shaft structure, with an oil distributor connected to its lower end and a lower oil distributor flange fixed to its upper end. A quick-connect female is provided on the lower oil distributor flange. The worktable is correspondingly provided with an upper oil distributor flange and a quick-connect male. When the worktable is installed on the rotary seat, the quick-connect male and the quick-connect female are connected and conductive.

[0010] Furthermore, the rotary shaft bears the axial load through a thrust roller bearing and is radially positioned and supported by a tapered roller bearing.

[0011] Furthermore, each of the hydraulic cylinder assemblies includes: The upper end cover of the hydraulic cylinder is fixed on the base; The cylinder body is connected to the upper end cover of the cylinder; The cylinder piston is disposed inside the cylinder body; And a piston rod fixed to the top of the cylinder piston and fixedly connected to the bridge plate via a connecting flange.

[0012] Furthermore, a lower end cover is provided at the lower end of the cylinder body, and a compression fitting for connecting external hydraulic lines is installed on the lower end cover.

[0013] Furthermore, the planetary reducer is directly connected to the servo motor and integrated onto the rotary table.

[0014] Furthermore, the number of the positioning cone assemblies is four, and they are evenly distributed on the rotary seat.

[0015] Furthermore, there are four male and four female quick-connect couplings, which are used to simultaneously switch on and off multiple hydraulic oil channels.

[0016] The beneficial effects of this utility model after adopting the above structure are as follows: 1. The automatic exchange device of this utility model adopts a servo motor driven gear transmission mechanism to realize the exchange action. Its advantages are: high servo transmission accuracy, fast response, high exchange efficiency, stable and reliable mechanism, low manufacturing and maintenance cost, and strong interchangeability. 2. The lifting mechanism of the automatic exchange device of this utility model is driven by a double hydraulic cylinder. The double hydraulic cylinders are arranged on both sides of the automatic exchange device. Its advantages are: the lifting mechanism is driven by a double hydraulic cylinder, which can obtain a larger workpiece load-bearing capacity and improve the load-bearing performance of the horizontal machining center; the lifting mechanism is arranged on both sides of the device, providing space for the installation of the guide rail protective cover, so that the chip removal of the horizontal machining center is smooth and the machine tool reliability is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the isometric structure of the automatic exchange device for a horizontal machining center with a dual-exchange worktable disclosed in this invention. Figure 2 This is a longitudinal sectional view of the automatic exchange device for a horizontal machining center with a dual-exchange worktable disclosed in this invention. Figure 3 This is a cross-sectional view of the automatic exchange device for a horizontal machining center with a double-exchange worktable disclosed in this invention.

[0018] Explanation of reference numerals in the attached figures: 1. Worktable, 2. Left contact block, 3. Right contact block, 4. Rotary seat, 5. Worktable base, 6. Base, 7. Bridge plate, 8. Rotary table claw, 9. Lower contact block, 10. Positioning cone assembly, 11. Quick coupling male, 12. Upper oil distribution flange, 13. Breather valve, 14. Quick coupling female, 15. Lower oil distribution flange, 16. Thrust ball bearing, 17. Rotary spindle, 18. Angular contact ball bearing, 19. Locking nut, 20. Oil distributor, 21. Servo motor, 22. Planetary reducer, 23. Pinion, 24. Pressure cap, 25. Upper end cover, 26. Tapered roller bearing, 27. Large gear, 28. Rotary shaft, 29. Rotary table, 30. Bottom pressure cap, 31. Thrust roller bearing, 32. Compression fitting, 33. Lower end cover of hydraulic cylinder, 34. Hydraulic cylinder piston, 35. Hydraulic cylinder body, 36. Upper end cover of hydraulic cylinder, 37. Connecting flange, 38. Cover plate. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0021] See Figure 1-3 The automatic exchange device in this embodiment mainly includes a base 6, a worktable exchange mechanism, a worktable rotation mechanism, and a dual hydraulic cylinder lifting mechanism. These four mechanisms are integrated on the base 6 to form a compact and efficient automatic exchange unit.

[0022] 1. Table exchange mechanism (responsible for driving the entire rotating part to rotate) This mechanism is the core power component that enables the 180-degree rotation and exchange of the worktable. It includes a bridge plate 7, which is bolted to the base 6 and serves as the supporting foundation for the entire rotational motion.

[0023] Core transmission component: A rotary shaft 28 is precisely mounted at the center of the bridge plate 7. The rotary shaft 28 is supported by a high-load bearing combination: its axial load is borne by a thrust roller bearing 31, which is connected to the upper rotary table 29 via a bottom cover 30; its radial positioning and additional axial force are borne by a tapered roller bearing 26, which is connected to the rotary table 29 via an upper end cover 25. The advantage of this bearing arrangement is that it can withstand huge combined loads, ensuring the smoothness and high rigidity of the rotation process under heavy loads, and structurally avoiding jamming.

[0024] Servo drive system: A servo motor 21 and a planetary reducer 22 are integrated on the rotary table 29. The high-speed shaft of the planetary reducer 22 is directly connected to the servo motor 21, and a pinion 23 is mounted on its low-speed output shaft. The pinion 23 meshes with a large gear 27 fixedly mounted on the rotary shaft 28, forming a single-stage high-reduction-ratio gear transmission pair.

[0025] Advantages: 1) High precision and high response: Servo motors provide precise angle control and fast start and stop response, which makes the table exchange position accurate and the exchange time significantly shortened.

[0026] 2) High rigidity and stability: The combination of planetary reducer and gear transmission provides transmission rigidity far exceeding that of hydraulic motor, resulting in smooth movement, no crawling phenomenon, and improved stability of the exchange process.

[0027] 3) Easy to control and maintain: The electronically controlled servo system is cleaner and more precise than the hydraulic system, and does not require complex hydraulic pipelines and oil temperature control, resulting in lower maintenance costs.

[0028] 2. Workbench rotation mechanism (responsible for installing, positioning, and connecting the workbench) The mechanism interfaces directly with the workbench 1 to be exchanged, enabling precise positioning and connection of hydraulic / pneumatic signals.

[0029] Worktable mounting base: The rotary spindle 17 is mounted on the worktable base 5 via a bearing assembly consisting of a thrust ball bearing 16 and an angular contact ball bearing 18, and is pre-tightened by a lock nut 19. This bearing configuration can withstand both axial and radial forces simultaneously, ensuring the rotational accuracy of the rotary spindle 17. A rotary seat 4 is fixed to the top of the rotary spindle 17.

[0030] Precise positioning and gripping: Four positioning cone components 10 are evenly distributed on the rotary seat 4, and the worktable 1 achieves precise and repeatable positioning through these four cone surfaces. The front end of the worktable 1 is equipped with a left contact block 2, a right contact block 3 and a lower contact block 9, which together form a "gripping space".

[0031] Automatic hydraulic circuit connection: In order to realize the automatic connection of hydraulic functions such as worktable clamping, this embodiment designs a quick hydraulic circuit connector system.

[0032] The upper end face of the rotary spindle 17 is fixed with a lower oil distribution flange 15, on which four quick-connect female heads 14 are installed.

[0033] The bottom surface of the workbench 1 is equipped with an upper oil distribution flange 12, on which four quick-connect male connectors 11 are installed.

[0034] When the worktable 1 is placed on the rotary seat 4 and positioned, the male connector 11 and the female connector 14 of the quick connector automatically align and lock in the vertical direction, thus connecting the oil circuit; when the worktable is removed, the connector automatically separates and seals.

[0035] Advantages: It enables automatic, fast, and reliable connection and disconnection of hydraulic functions without manual intervention, greatly improving exchange efficiency and eliminating the risk of oil leakage.

[0036] Dual hydraulic cylinder lifting mechanism (responsible for raising and lowering the entire exchange unit) This mechanism is key to enabling the "grabbing" and "placing" actions on the workbench.

[0037] Symmetrical layout design: Two identical hydraulic cylinder assemblies are symmetrically arranged at both ends of the bridge plate 7. Each hydraulic cylinder assembly includes an upper cylinder cover 36, a cylinder body 35, a cylinder piston 34, a lower cylinder cover 33, and a connecting flange 37. The connecting flange 37 at the top of the cylinder piston 34 is fixedly connected to the bridge plate 7.

[0038] The core advantages it brings: 1) High load-bearing capacity: The dual hydraulic cylinders work synchronously, and their total thrust is twice that of the single hydraulic cylinder, which significantly improves the workpiece load-bearing capacity of the device and allows the horizontal machining center to process heavier and larger parts.

[0039] 2) Balanced force distribution to avoid jamming: The symmetrical layout ensures that the lifting force is evenly distributed, avoiding deformation or jamming of the bridge plate 7 and the rotary table 29 due to uneven loading, making the movement smoother and more reliable.

[0040] 3) Optimized spatial layout: The lifting mechanism has been moved from the traditional center to both sides, leaving ample space for the installation of a wide guide rail protective cover in the center of base 6. This allows the metal chips generated during processing to fall smoothly into the chip conveyor, completely solving the problem of difficult chip removal in the original structure and improving the overall reliability of the machine.

[0041] Brief description of the work process: Lifting and gripping: The hydraulic system supplies oil to the dual hydraulic cylinders through the compression fitting 32 on the lower end cover 33 of the cylinder, pushing the cylinder pistons 34 to rise synchronously, thereby lifting the entire bridge plate 7 and the above mechanism. The hooks 8 on the rotary table 29 rise accordingly and embed into the gripping space at the front end of the worktable 1 to complete the gripping.

[0042] Rotary exchange: Servo motor 21 starts and drives rotary shaft 28 and rotary table 29 to rotate 180 degrees through planetary reducer 22 and gear pair, exchanging the worktables of the two workstations.

[0043] Lowering and Releasing: The dual hydraulic cylinders descend synchronously, lowering the device carrying the new worktable to the processing position. The worktable 1 is precisely positioned via the positioning cone assembly 10, while the quick-connect male head 11 engages with the female head 14. The claw 8 retracts from the grabbing space, completing the entire exchange process.

[0044] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An automatic exchange device for a horizontal machining center with a double-exchange worktable, characterized in that, include: Base; The workbench exchange mechanism includes a bridge plate fixed to the base, a rotary shaft rotatably disposed at the center of the bridge plate, and a drive assembly for driving the rotary shaft to rotate. A worktable rotation mechanism is located above the rotation shaft and is used to install and position the worktable; The dual hydraulic cylinder lifting mechanism includes two hydraulic cylinder assemblies symmetrically arranged at both ends of the bridge plate. The piston end of the hydraulic cylinder assembly is connected to the bridge plate and is used to synchronously drive the bridge plate and the worktable exchange mechanism and the worktable rotation mechanism disposed thereon to lift the entire structure. The drive assembly includes a large gear mounted on the rotary shaft and a small gear driven by a servo motor via a planetary reducer. The small gear meshes with the large gear to form a primary reduction transmission pair.

2. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 1, characterized in that, The worktable rotation mechanism includes: A rotary table fixed to the top of the rotary shaft; The rotary spindle is mounted on the rotary table and is supported on the worktable base by a thrust ball bearing and an angular contact ball bearing. A rotary seat fixed to the upper end of the rotary spindle is provided with a plurality of positioning cone assemblies for positioning and clamping the worktable.

3. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 2, characterized in that, The rotating platform is equipped with a claw, and the front end of the worktable is equipped with a left contact block, a right contact block and a lower contact block. The left contact block, the right contact block and the lower contact block form a hooking space for the claw to be inserted.

4. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 2, characterized in that, The rotary spindle is a hollow shaft structure with an oil distributor connected to its lower end and a lower oil distributor flange fixed to its upper end. A quick-connect female is provided on the lower oil distributor flange. The worktable is correspondingly provided with an upper oil distributor flange and a quick-connect male. When the worktable is installed on the rotary seat, the quick-connect male and quick-connect female are connected and conductive.

5. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 1, characterized in that, The rotating shaft bears axial loads through thrust roller bearings and is radially positioned and supported by tapered roller bearings.

6. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 1, characterized in that, Each of the hydraulic cylinder assemblies includes: The upper end cover of the hydraulic cylinder is fixed on the base; The cylinder body is connected to the upper end cover of the cylinder; The cylinder piston is disposed inside the cylinder body; And a piston rod fixed to the top of the cylinder piston and fixedly connected to the bridge plate via a connecting flange.

7. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 6, characterized in that, The lower end of the cylinder body is provided with a cylinder lower end cover, and a compression fitting for connecting external hydraulic lines is installed on the cylinder lower end cover.

8. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 2, characterized in that, The planetary reducer is directly connected to the servo motor and integrated onto the rotary table.

9. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 2, characterized in that, The number of positioning cone assemblies is four, and they are evenly distributed on the rotary seat.

10. The automatic exchange device for a horizontal machining center with a double-exchange worktable according to claim 4, characterized in that, The quick-connector has four male and four female connectors, which are used to simultaneously switch on and off multiple hydraulic oil channels.

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