Variable-angle large-length-diameter-ratio lead screw nut internal thread grinding device

Abstract

The invention relates to the technical field of grinding machining, in particular to an angle-variable large-length-diameter-ratio lead screw nut internal thread grinding device which comprises a driving element, a first transmission mechanism, an angle adjusting mechanism and a grinding assembly, and the driving element drives a first lead screw in the first transmission mechanism to rotate and drives a first nut sleeve and a connecting piece to linearly move; the angle adjusting mechanism comprises a bottom plate, a movable plate and a second transmission mechanism, the movable plate is hinged to the bottom plate through a shaft seat, a driving motor of the second transmission mechanism drives a second lead screw to enable a second nut sleeve and a sliding block to move, and the movable plate is pushed to rotate around the shaft seat through a connecting rod. A split torque motor of the grinding assembly is fixed to the movable plate, and the output end is connected with a grinding wheel. The included angle between the grinding wheel and a workpiece is changed by dynamically adjusting the inclination angle of the movable plate, it is ensured that a safe gap is kept between the grinding rod and the inner wall of a deep hole in the axial feeding process, and the interference and collision problems during large-length-diameter-ratio internal thread grinding are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding processing, in particular to a variable-angle large-length-diameter-ratio ball screw nut inner thread grinding device. BACKGROUND

[0002] In the field of inner thread grinding, the traditional inclined shaft grinding method needs to adjust the grinding wheel axis and the workpiece axis to the theoretical helix angle, and the helical surface formed by the method has the normal straight profile characteristic.

[0003] However, in the processing scene of large-length-diameter-ratio inner thread, due to the posture of the grinding rod of the grinding wheel, as the axial feed depth increases, the gap between the grinding rod of the grinding wheel and the inner wall of the workpiece continuously decreases, and finally interference collision occurs, resulting in damage to the workpiece and making the workpiece unable to be processed.

[0004] Therefore, there is an urgent need for a device that can realize continuous grinding in deep hole and slender parts without modifying the grinding wheel. SUMMARY

[0005] The purpose of the present application is to provide a variable-angle large-length-diameter-ratio ball screw nut inner thread grinding device to solve the problems mentioned in the background.

[0006] To achieve the above purpose, the present application provides a variable-angle large-length-diameter-ratio ball screw nut inner thread grinding device, which comprises a driving element, a first transmission mechanism, an angle adjusting mechanism and a grinding assembly, the output end of the driving element is connected with the input end of the first transmission mechanism, the output end of the first transmission mechanism is connected with the angle adjusting mechanism, a fixing seat is arranged between the first transmission mechanism and the angle adjusting mechanism, guide rods are arranged at the upper and lower ends of the fixing seat, the guide rods are connected with the fixing seat through second bearings, the angle adjusting mechanism is connected with the fixing seat through the guide rods, and the grinding assembly is fixedly connected with the angle adjusting mechanism.

[0007] Preferably, the output end of the driving element is connected with the input end of the first transmission mechanism through belt transmission. The belt transmission comprises a transmission box body, a driving wheel and a driven wheel, a belt wheel cover plate is fixed on one side of the belt wheel transmission box body, the driving wheel and the driven wheel are installed inside the belt wheel transmission box body, and the driving wheel is connected with the driven wheel through a conveying belt.

[0008] Preferably, the first transmission mechanism comprises an outer sleeve, a bearing box body and a screw nut mechanism arranged in the outer sleeve, one end of the bearing box body is fixedly connected with the outer sleeve, and the other end is fixedly connected with the transmission box body. A first bearing is arranged in the bearing box body, and baffles are fixedly connected to the upper and lower sides of the outer sleeve.

[0009] Preferably, the screw rod and nut mechanism comprises a first screw rod and a first nut sleeve sleeved outside the first screw rod.

[0010] Preferably, the angle adjusting mechanism is fixedly connected with the first nut sleeve through a connecting piece. The angle adjusting mechanism comprises a bottom plate, a second transmission mechanism and a movable plate, both ends of the bottom plate are provided with shaft seats, and the movable plate is hinged with the shaft seats.

[0011] Preferably, the bottom of the movable plate is provided with a connecting block. One end of the second transmission mechanism is connected with the bottom plate, and the other end is connected with the movable plate.

[0012] Preferably, the second transmission mechanism comprises a driving motor, a second screw rod and a second nut sleeve, the second screw rod is fixedly connected with the bottom plate through a support seat, and one end of the second screw rod is connected with the driving motor. The second nut sleeve is arranged outside the second screw rod, a sliding block is sleeved outside the second nut sleeve, left and right sides of the sliding block are provided with connecting rods, one end of the connecting rod is hinged with the sliding block, and the other end is hinged with the connecting block.

[0013] Preferably, the grinding assembly comprises a grinding wheel and a split torque motor, the split torque motor is fixedly installed on the movable plate, and the grinding wheel is connected with the output end of the split torque motor.

[0014] Preferably, the driving element is an electric motor.

[0015] Therefore, the present application provides a variable-angle large-length-diameter-ratio screw rod and nut inner thread grinding device, which has the following beneficial effects: the first transmission mechanism converts the rotary motion into linear feeding through the screw rod and nut mechanism, the first screw rod rotates, drives the first nut sleeve and the connecting piece to move linearly along the length direction of the first screw rod, and ensures that the angle adjusting mechanism and the grinding assembly fixed on the connecting piece continuously linearly feed.

[0016] By arranging the angle adjusting mechanism, the driving motor drives the second screw rod to rotate, the sliding block moves along the second screw rod, and the angle of the movable plate is adjusted, so that the included angle between the grinding wheel axis and the workpiece can be finally adjusted. When the workpiece is axially fed, the angle of the grinding wheel can be dynamically changed, so that the grinding rod always maintains a safe gap with the hole wall and collision is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an axial view of the variable-angle large-length-diameter-ratio screw rod and nut inner thread grinding device in the embodiment of the present application. Figure 2It is a cross-sectional view of a variable-angle large-length-diameter-ratio screw nut inner thread grinding device in a bent state in an embodiment of the present application; Figure 3 It is a structural schematic view of an angle adjusting mechanism in an embodiment of the present application; Figure 4 It is a structural schematic view of another view of a variable-angle large-length-diameter-ratio screw nut inner thread grinding device in an embodiment of the present application; Reference signs 1, motor; 2, first transmission mechanism; 21, bearing box; 22, outer sleeve; 23, first bearing; 24, first screw rod; 25, baffle; 26, first nut sleeve; 3, angle adjusting mechanism; 31, bottom plate; 311, shaft seat; 32, movable plate; 33, second transmission mechanism; 331, driving motor; 332, second screw rod; 333, support seat; 334, second nut sleeve; 335, sliding block; 336, connecting rod; 34, connecting block; 4, grinding assembly; 5, belt transmission; 51, transmission box; 52, driving wheel; 53, driven wheel; 54, transmission belt; 55, pulley cover plate; 6, connecting piece; 7, split torque motor; 8, grinding wheel; 9, fixed seat; 10, guide rod; 11, second bearing. DETAILED DESCRIPTION

[0018] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0019] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0021] Embodiments As Figures 1-4As shown, the variable angle large length-diameter ratio screw nut inner thread grinding device of the present application comprises a driving element, a first transmission mechanism 2, an angle adjusting mechanism 3 and a grinding assembly 4. In this embodiment, the driving element is a motor 1, the output end of the motor 1 is connected with the first transmission mechanism 2 through a belt transmission 5, the belt transmission 5 comprises a transmission box body 51, a driving pulley 52 and a driven pulley 53, a pulley box cover plate 55 is fixed on one side of the belt transmission box body 51, the driving pulley 52 and the driven pulley 53 are installed inside the belt transmission box body 51, the driving pulley 52 is fixedly connected with the output shaft of the motor 1, the driven pulley 53 is connected with the input end of the first transmission mechanism 2, and the driving pulley 52 is connected with the driven pulley 53 through a transmission belt 54.

[0022] The output end of the first transmission mechanism 2 is connected with the angle adjusting mechanism 3, a fixing seat 9 is arranged between the first transmission mechanism 2 and the angle adjusting mechanism 3, guide rods 10 are arranged at the upper and lower ends of the fixing seat 9, the guide rods 10 are connected with the fixing seat 9 through second bearings 11, the second bearings 11 are linear bearings, the angle adjusting mechanism 3 is connected with the fixing seat 9 through the guide rods 10, and the grinding assembly 4 is fixedly connected with the angle adjusting mechanism 3.

[0023] The first transmission mechanism 2 comprises an outer sleeve 22, a bearing box body 21 and a screw nut mechanism arranged inside the outer sleeve 22, one end of the bearing box body 21 is fixedly connected with the outer sleeve 22, the other end is fixedly connected with the transmission box body 51, the inside of the bearing box body 21 is provided with a first bearing 23, and the upper and lower sides of the outer sleeve 22 are fixedly connected with baffles 25.

[0024] The screw nut mechanism comprises a first screw rod 24 and a first nut sleeve 26 sleeved outside the first screw rod 24. When the driven pulley 53 drives the first screw rod 24 to rotate, the first nut sleeve 26 and the connecting piece 6 move linearly along the axial direction of the first screw rod 24, the rotary motion is converted into the feeding motion, and the grinding assembly 4 is driven to linearly feed.

[0025] The angle adjusting mechanism 3 is fixedly connected with the nut sleeve through the connecting piece 6, the angle adjusting mechanism 3 comprises a bottom plate 31, a second transmission mechanism 33 and a movable plate 32, one end of the second transmission mechanism 33 is connected with the bottom plate 31, and the other end is connected with the movable plate 32. Both ends of the bottom plate 31 are provided with shaft seats 311, the movable plate 32 is hinged with the shaft seats 311, the pitching movement of the movable plate 32 around the shaft seats 311 is realized, a connecting block 34 is arranged at the bottom of the movable plate 32, and the connecting block 34 is used for transmitting the driving force of the second transmission mechanism 33.

[0026] The second transmission mechanism 33 comprises a driving motor 331, a second screw rod 332 and a second nut sleeve 334, the second screw rod 332 is fixedly connected with the bottom plate 31 through a support seat 333, one end of the second screw rod 332 is connected with the driving motor 331, the second nut sleeve 334 is arranged outside the second screw rod 332, a sliding block 335 is sleeved outside the second nut sleeve 334, a connecting rod 336 is arranged on the left side and the right side of the sliding block 335, one end of the connecting rod 336 is hinged with the sliding block 335, and the other end is hinged with the connecting block 34.When the driving motor 331 drives the second screw rod 332 to rotate, the second nut sleeve 334 drives the sliding block 335 to move linearly along the axial direction of the second screw rod 332, and the connecting rod 336 pushes the movable plate 32 to rotate around the shaft seat 311, so that the inclination angle of the movable plate 32 is dynamically adjusted The grinding assembly 4 comprises a grinding wheel 8 and a split torque motor 7, the split torque motor 7 is fixedly installed on the movable plate 32, and the grinding wheel 8 is connected with the output end of the split torque motor 7.

[0027] The working principle of the variable-angle large-length-diameter-ratio screw nut inner thread grinding device with the above structure is as follows: the motor 1 drives the first screw rod 24 to rotate through the belt transmission 5, drives the first nut sleeve 26 and the connecting piece 6 fixedly connected with the first nut sleeve 26 to move linearly, and then drives the angle adjusting mechanism 3 and the grinding assembly 4 to move linearly along the axial direction of the first screw rod 24, so that the grinding wheel 8 moves in the depth direction of the workpiece inner hole.

[0028] During the feeding process, when the driving motor 331 drives the second screw rod 332 to rotate, the second nut sleeve 334 drives the sliding block 335 to move axially, and the connecting rod 336 pushes the movable plate 32 to rotate around the shaft seat 311, so that the inclination angle of the movable plate 32 is adjusted, the included angle between the axis of the grinding wheel 8 and the axis of the workpiece is dynamically adjusted with the feeding depth, the collision problem caused by the reduction of the gap during the grinding of the large-length-diameter-ratio inner thread is avoided, and it is ensured that the grinding rod always maintains a safe gap with the inner wall of the workpiece.

[0029] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application rather than limit them, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A variable angle, large aspect ratio lead screw nut internal thread grinding device, characterized by: It includes a driving element, a first transmission mechanism, an angle adjustment mechanism and a grinding assembly, the output end of the driving element is connected to the input end of the first transmission mechanism, the output end of the first transmission mechanism is connected to the angle adjustment mechanism, a fixed seat is provided between the first transmission mechanism and the angle adjustment mechanism, guide rods are provided at the upper and lower ends of the fixed seat, the guide rods are connected to the fixed seat through a second bearing, the angle adjustment mechanism is connected to the fixed seat through the guide rods, and the grinding assembly is fixedly connected to the angle adjustment mechanism.

2. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 1, characterized in that: The output end of the driving element is connected to the input end of the first transmission mechanism via a belt drive; The belt drive includes a transmission box, a driving wheel and a driven wheel. A pulley box cover is fixed to one side of the pulley transmission box. The driving wheel and the driven wheel are installed inside the pulley transmission box. The driving wheel and the driven wheel are connected by a transmission belt.

3. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 2, characterized in that: The first transmission mechanism includes an outer sleeve, a bearing housing, and a screw-nut mechanism disposed inside the outer sleeve, one end of the bearing housing being fixedly connected to the outer sleeve, and the other end thereof being fixedly connected to the transmission housing; A first bearing is provided inside the bearing box, and baffles are fixedly connected to the upper and lower sides of the outer sleeve.

4. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 3, characterized in that: The screw-nut mechanism includes a first screw and a first nut sleeve sleeved outside the first screw.

5. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 2, characterized in that: The angle adjustment mechanism is fixedly connected to the first nut sleeve via a connecting piece; The angle adjustment mechanism includes a base plate, a second transmission mechanism and a movable plate. Both ends of the base plate are provided with shaft seats, and the movable plate is hinged to the shaft seats.

6. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 5, characterized in that: A connecting block is provided at the bottom of the movable plate; One end of the second transmission mechanism is connected to the bottom plate, and the other end is connected to the movable plate.

7. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 6, characterized in that: The second transmission mechanism includes a driving motor, a second screw rod and a second nut sleeve, the second screw rod is fixedly connected to the base plate through a support seat, and one end of the second screw rod is connected to the driving motor; The second nut sleeve is arranged on the outside of the second screw rod, and a slider is provided on the outside of the second nut sleeve. Connecting rods are provided on the left and right sides of the slider. One end of the connecting rod is hinged to the slider, and the other end is hinged to the connecting block.

8. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 6, characterized in that: The grinding assembly includes a grinding wheel and a split torque motor. The split torque motor is fixedly mounted on the movable plate, and the grinding wheel is connected to the output end of the split torque motor.

9. The variable-angle, large aspect ratio lead screw nut internal thread grinding device according to claim 1, characterized in that: The driving element is an electric motor.

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