Double-speed speed reducer for bending machine

Abstract

The application discloses a double-speed speed reducer for a bending machine, which comprises a servo motor, horizontal bevel gears, vertical bevel gears and a three-piece clutch. The servo motor is fixed to a right-angle support, and the output shaft is connected to a center double-sun gear through the bevel gears. The three-piece clutch comprises an upper tooth chuck, a middle double-sided tooth chuck and a lower tooth chuck, and realizes clutch switching in cooperation with a traction electromagnet. An upper machine stand and four other parts constitute an outer shell, and a planetary gear system and an inner ring gear are arranged in the outer shell. An output connecting sleeve is connected to the center double-sun gear through splines. The speed reducer can automatically switch two kinds of speed reduction ratios. The large speed reduction ratio is used for slow work of a main shaft, and the small speed reduction ratio is used for fast feeding and fast returning. The speed reducer can reduce motor power, reduce power demand and cost of installed machines, and improve driving speed of a sliding block and working efficiency.

Description

Technical Field

[0001] This invention relates to the field of dual-speed reducer technology, specifically a dual-speed reducer for a bending machine. Background Technology

[0002] In a typical all-electric servo bending machine, the spindle reducer has a single speed ratio. When the speed ratio is small, the motor power required to drive the spindle is high. Due to its larger size and weight, it needs to be mounted upside down inside the frame, and the motor drive is transmitted to the spindle screw via a synchronous belt reducer. This not only requires high power and increases cost, but also results in high noise from the high-speed transmission of the high-power synchronous belt and a lower response speed for short-stroke slide movements. Conversely, when the single speed ratio is large, the motor power required to drive the spindle is lower, but the speed is lower during long-stroke drives, leading to a lower rapid traverse speed for the bending machine spindle and impacting work efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-speed reducer for a bending machine to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dual-speed reducer for a bending machine, comprising a servo motor, a horizontal bevel gear, a vertical bevel gear, and a three-plate clutch; The servo motor is bolted to a right-angle support. A bearing is installed at the connection between the servo motor's output shaft and the right-angle support. A horizontal bevel gear is mounted on the servo motor's output shaft. A central double sun gear is mounted on the base plate of the right-angle support via a bearing, and a vertical bevel gear is mounted on the upper end of the central double sun gear. The vertical bevel gear meshes with the horizontal bevel gear. An upper base is fixed to the bottom of the right-angle support. A three-plate clutch is mounted on the central double sun gear inside the upper base. A planetary gear support is mounted on the central double sun gear below the three-plate clutch via a bearing. An upper planetary gear and a lower planetary gear are mounted on the bracket via a shaft. The outer side of the upper planetary gear meshes with an upper internal gear ring, which is connected to a three-plate clutch via bolts. The outer side of the lower planetary gear meshes with a lower internal gear ring, and a lower gear ring bearing support is mounted on the outer side of the lower internal gear ring via a bearing. A bottom connecting seat is provided below the lower gear ring bearing support, and an output connecting sleeve fixed to the lower internal gear ring is provided inside the bottom connecting seat. An upper gear ring bearing support is provided between the lower gear ring bearing support and the upper machine base, and the upper gear ring is mounted on the upper gear ring bearing support via a bearing.

[0005] Furthermore, the three-plate clutch includes an upper toothed chuck, a middle double-sided toothed chuck, and a lower toothed chuck. The upper toothed chuck is rigidly concentrically connected to the planetary gear support through a connecting sleeve. The middle double-sided toothed chuck is circumferentially fixed to the upper base through a sliding key. The lower toothed chuck is rigidly concentrically connected to the upper inner gear ring.

[0006] Furthermore, a traction electromagnet is bolted onto the intermediate double-sided toothed chuck, and the traction electromagnet passes through the upper machine base.

[0007] Furthermore, the upper base, upper gear ring bearing support, lower gear ring bearing support, and bottom connecting seat together constitute the outer shell structure of the reducer.

[0008] Furthermore, an angular contact ball bearing is installed between the upper internal gear ring and the upper gear ring bearing support. The angular contact ball bearings are installed in pairs in opposite directions, and an annular mounting groove for accommodating the inner ring of the angular contact ball bearing is provided on the outer wall of the upper internal gear ring. Positioning steps for limiting the axial displacement of the angular contact ball bearing are provided at both ends of the annular mounting groove. Similarly, an angular contact ball bearing is installed between the lower internal gear ring and the lower gear ring bearing support, and the installation structure is consistent with the mating structure of the upper internal gear ring and the upper gear ring bearing support.

[0009] The beneficial effects of this invention are: This dual-speed reducer is used for the spindle drive of an all-electric servo bending machine. It automatically switches between two reduction ratios: a large reduction ratio is used for the slow feed drive of the spindle, and a small reduction ratio is used for the fast feed and fast return drive of the spindle. The two reduction ratios automatically switch as needed during operation, reducing the power of the spindle motor and enabling higher slide block fast descent and fast return drive speeds. This significantly reduces the power requirements of the installed machine and further reduces the cost of the spindle structure configuration. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the dual-speed reducer of the present invention; Figure 2 This is a schematic diagram of the three-plate clutch in this invention.

[0011] In the diagram: 1. Servo motor; 2. Bearing 1; 3. Right-angle support; 4. Horizontal bevel gear; 5. Vertical bevel gear; 6. Bearing 2; 7. Traction electromagnet; 8. Three-plate clutch; 81. Upper gear chuck; 82. Middle double-sided gear chuck; 83. Lower gear chuck; 9. Planetary gear support; 10. Upper internal gear ring; 11. Upper planetary gear; 12. Lower internal gear ring; 13. Lower planetary gear; 14. Upper base; 15. Upper gear ring bearing support; 16. Lower gear ring bearing support; 17. Bottom connecting seat; 18. Output connecting sleeve; 19. Central double sun gear. Detailed Implementation

[0012] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0013] like Figure 1 and Figure 2As shown, a dual-speed reducer for a bending machine includes a servo motor 1, a horizontal bevel gear 4, a vertical bevel gear 5, and a three-plate clutch 8. The servo motor 1 is bolted to the right-angle support 3. A bearing 2 is installed at the connection between the output shaft of the servo motor 1 and the right-angle support 3. A horizontal bevel gear 4 is mounted on the output shaft of the servo motor 1. A central double sun gear 19 is mounted on the base plate of the right-angle support 3 via a bearing 6. A vertical bevel gear 5 is mounted on the upper end of the central double sun gear 19, meshing with the horizontal bevel gear 4. An upper base 14 is fixed to the bottom of the right-angle support 3. A three-plate clutch 8 is mounted on the central double sun gear 19 inside the upper base 14. A planetary gear carrier 9 is mounted on the central double sun gear 19 below the three-plate clutch 8 via a bearing. The shaft is equipped with an upper planetary gear 11 and a lower planetary gear 13. The outer side of the upper planetary gear 11 meshes with the upper internal gear ring 10, and the upper internal gear ring 10 is connected to the three-plate clutch 8 by bolts. The outer side of the lower planetary gear 13 meshes with the lower internal gear ring 12, and the outer side of the lower internal gear ring 12 is equipped with a lower gear ring bearing support 16 through a bearing. A bottom connecting seat 17 is provided below the lower gear ring bearing support 16, and an output connecting sleeve 18 fixed on the lower internal gear ring 12 is provided inside the bottom connecting seat 17. An upper gear ring bearing support 15 is provided between the lower gear ring bearing support 16 and the upper base 14, and the upper internal gear ring 10 is installed on the upper gear ring bearing support 15 through a bearing.

[0014] The three-plate clutch 8 includes an upper gear chuck 81, a middle double-sided gear chuck 82, and a lower gear chuck 83. The upper gear chuck 81 is rigidly concentrically connected to the planetary gear carrier 9 via a connecting sleeve. The middle double-sided gear chuck 82 is circumferentially fixed to the upper base 14 via a sliding key. The lower gear chuck 83 is rigidly concentrically connected to the upper internal gear ring 10. A traction electromagnet 7 is bolted to the middle double-sided gear chuck 82, and the traction electromagnet 7 passes through the upper base 14. Driven by the traction electromagnet 7, the middle double-sided gear chuck of the three-plate clutch 8 switches between upper and lower engagement / disengagement, which can circumferentially lock either the planetary gear carrier 9 or the upper internal gear ring 10, realizing the switching output of two transmission ratios of the 3K-H planetary gear system.

[0015] The upper base 14, the upper gear ring bearing support 15, the lower gear ring bearing support 16, and the bottom connecting seat 17 are combined to form the housing structure of the reducer.

[0016] An angular contact ball bearing is installed between the upper internal gear ring 10 and the upper gear ring bearing support 15. The angular contact ball bearings are installed in pairs in opposite directions. The outer wall of the upper internal gear ring 10 has an annular mounting groove for accommodating the inner ring of the angular contact ball bearing. The two ends of the annular mounting groove are provided with positioning steps to limit the axial displacement of the angular contact ball bearing. An angular contact ball bearing is also installed between the lower internal gear ring 12 and the lower gear ring bearing support 16. The installation structure is consistent with the mating structure of the upper internal gear ring 10 and the upper gear ring bearing support 15.

[0017] The drive of servo motor 1 is input to the reducer from a right angle. The servo motor is equipped with a brake device as standard, which can lock the slider that moves up and down when the machine tool is powered off.

[0018] When the machine tool is stopped or in standby mode, the spindle stops at the top dead center or the starting point of the cycle. Once it starts working, it needs to be driven by fast advance. Therefore, when the machine tool is stopped or in standby mode, the dual-speed reducer is in the fast gear transmission mode with a small reduction ratio. At this time, the middle double-sided toothed chuck of the three-plate clutch 8 is located at the top and is engaged with the connecting chuck of the planetary gear support 9, which is conducive to realizing fast advance drive with a small reduction ratio after the machine is started.

[0019] When the machine tool spindle completes the rapid traverse and transitions to the working feed, the reducer switches between fast and slow gears. Driven by the traction electromagnet 7, the middle double-sided toothed chuck of the three-plate clutch 8 moves downwards from its engagement position with the upper end-face toothed chuck until it engages with the lower end-face toothed chuck. Because the three-plate clutch 8 requires engagement at corresponding positions on the equally spaced end-face teeth during switching, the shifting position is selected by the CNC system from a series of pre-planned fixed-interval points, rather than being arbitrary. After the fast / slow gear shift is complete, the spindle reducer performs the working feed transmission at a relatively large reduction ratio.

[0020] After the machine tool spindle completes the machining at a slow feed speed, it moves in the reverse direction and reaches the nearest shift position to perform a slow-to-fast gear switching action. Driven by the traction electromagnet 7, the middle double-sided toothed chuck of the three-plate clutch 8 moves upward from the position of meshing with the lower end face toothed chuck until it reaches the position of meshing with the upper end face toothed chuck. After completing the slow-to-fast gear switching action, the spindle reducer performs transmission with a small reduction ratio to quickly complete the reset action.

Claims

1. A dual-speed reducer for a bending machine, characterized in that: It includes a servo motor (1), a horizontal bevel gear (4), a vertical bevel gear (5), and a three-plate clutch (8). The servo motor (1) is fixed to the right-angle support (3) by bolts. A bearing (2) is installed at the connection between the output shaft of the servo motor (1) and the right-angle support (3). A horizontal bevel gear (4) is installed on the output shaft of the servo motor (1). A central double sun gear (19) is installed on the bottom plate of the right-angle support (3) through a bearing (6). A vertical bevel gear (5) is installed on the upper end of the central double sun gear (19). The vertical bevel gear (5) and the horizontal bevel gear (4) mesh. An upper base (14) is fixed to the bottom of the right-angle support (3). A three-plate clutch (8) is installed on the central double sun gear (19) inside the upper base (14). A planetary gear support (9) is installed on the central double sun gear (19) below the three-plate clutch (8) through a bearing. An upper planetary gear (11) and a lower planetary gear (13) are mounted on the upper shaft. The outer side of the upper planetary gear (11) meshes with the upper internal gear ring (10), and the upper internal gear ring (10) is connected to a three-plate clutch (8) by bolts. The outer side of the lower planetary gear (13) meshes with the lower internal gear ring (12), and a lower gear ring bearing support (16) is mounted on the outer side of the lower internal gear ring (12) by a bearing. A bottom connecting seat (17) is provided below the lower gear ring bearing support (16), and an output connecting sleeve (18) fixed on the lower internal gear ring (12) is provided inside the bottom connecting seat (17). An upper gear ring bearing support (15) is provided between the lower gear ring bearing support (16) and the upper machine base (14), and the upper internal gear ring (10) is mounted on the upper gear ring bearing support (15) by a bearing. The three-plate clutch (8) includes an upper toothed chuck (81), a middle double-sided toothed chuck (82) and a lower toothed chuck (83). The upper toothed chuck (81) is rigidly concentrically connected to the planetary gear carrier (9) through a connecting sleeve. The middle double-sided toothed chuck (82) is circumferentially fixed to the upper machine base (14) through a sliding key. The lower toothed chuck (83) is rigidly concentrically connected to the upper inner gear ring (10). A traction electromagnet (7) is bolted onto the intermediate double-sided toothed chuck (82), and the traction electromagnet (7) passes through the upper base (14).

2. The dual-speed reducer for a bending machine according to claim 1, characterized in that: The upper base (14), upper gear ring bearing support (15), lower gear ring bearing support (16), and bottom connecting seat (17) together constitute the outer shell structure of the reducer.

3. The dual-speed reducer for a bending machine according to claim 1, characterized in that: An angular contact ball bearing is installed between the upper internal gear ring (10) and the upper gear ring bearing support (15). The angular contact ball bearings are installed in pairs in opposite directions. An annular mounting groove for accommodating the inner ring of the angular contact ball bearing is provided on the outer wall of the upper internal gear ring (10). Positioning steps for limiting the axial displacement of the angular contact ball bearing are provided at both ends of the annular mounting groove. An angular contact ball bearing is also installed between the lower internal gear ring (12) and the lower gear ring bearing support (16). The installation structure is consistent with the mating structure of the upper internal gear ring (10) and the upper gear ring bearing support (15).

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