Double drive grinder with swivel tailstock

Abstract

The utility model relates to double -drive grinding machine with rotary tailstock, its tailstock is rotary tailstock, is equipped with tailstock base and tailstock main shaft, the upper portion of tailstock base is equipped with the main shaft hole for the wear tailstock main shaft, and the hole wall between main shaft hole and tailstock main shaft leaves oil film gap, and both ends of oil film gap are sealed through rotary sealing device, and the rear end of tailstock main shaft is coaxially fixedly connected with spline shaft, and rotary drive motor is connected spline shaft through rotary transmission mechanism, is used for driving spline shaft rotation, and the spline sleeve matched with spline shaft rotates and installs in the rear portion of tailstock base, and the rear of spline sleeve is equipped with adjusting nut, and adjusting nut is screwed on spline shaft, and the driven wheel of belt transmission mechanism is clamped between adjusting nut and spline sleeve, and the base frame is equipped with slide plate, and the moving mode of slide plate is longitudinal, and rotary drive motor is fixedly installed on slide plate. The utility model discloses tailstock can rotate, and simple structure, stable operation, low noise, small resistance, and be favorable to improving the machining precision of grinding machine high.

Description

Technical Field

[0001] This utility model relates to a dual-drive grinding machine equipped with a rotary tailstock. Background Technology

[0002] With the continuous improvement of technology, the requirements for coaxiality in grinding are becoming increasingly stringent. However, the tailstock of traditional grinding machines cannot rotate, which restricts the improvement of coaxiality. Therefore, it is necessary to develop a tailstock that can rotate with high precision to improve the coaxiality of grinding and provide favorable conditions for improving the coaxiality of grinding. Utility Model Content

[0003] The purpose of this invention is to make the tailstock of the grinding machine a rotary tailstock, so as to improve the coaxiality of the workpiece.

[0004] The technical solution of this utility model is as follows: a dual-drive grinding machine equipped with a rotary tailstock, wherein the tailstock is a rotary tailstock, and a tailstock base and a tailstock spindle are provided. The upper part of the tailstock base is provided with a spindle hole for the tailstock spindle to pass through. The spindle hole is a longitudinal through hole, and an oil film gap (a tiny gap for filling pressurized fluid to form an oil film) is left between the hole wall and the tailstock spindle. The tailstock base is provided with an oil inlet and an oil return port communicating with the oil film gap. The oil inlet and the oil return port are respectively used to connect an oil inlet pipe and an oil return pipe, so that pressurized oil (pressurized lubricant) can be filled into the oil film gap by a pressure pump to form an oil film that suspends and supports the tailstock spindle. The tailstock spindle has a center or other structure for clamping workpieces at its front end (specific details can be determined based on actual requirements). A splined shaft is coaxially fixedly connected to the rear end of the tailstock spindle. A splined sleeve, which matches the splined shaft (spline connection), is rotatably mounted (e.g., via a splined bearing) at the rear of the tailstock base. A rotary drive motor is connected to the splined shaft via a rotary transmission mechanism to drive the splined shaft to rotate. Therefore, the tailstock spindle can be driven to rotate by the rotary drive motor, and the tailstock spindle can move longitudinally like a tailstock spindle on an existing fixed (non-rotating) tailstock.

[0005] A longitudinal drive device can be set up based on existing technology to drive the tailstock spindle to move longitudinally.

[0006] Preferably, the two ends of the oil film gap are sealed by a rotary sealing device (a device that achieves a seal and allows the two to rotate relative to each other).

[0007] Preferably, the tailstock base is provided with an oil inlet channel and an oil return channel. The oil inlet channel and / or the oil return channel are provided with several branches (which can be referred to as oil inlet branches and oil return branches, respectively). The inner ends of different oil inlet branches open at different longitudinal positions on the spindle bore wall so that the oil inlet is introduced into the oil film gap from several different longitudinal positions (different branch openings on the spindle bore wall). The inner ends of different oil return branches open at different longitudinal positions on the spindle bore wall so that the oil return from the oil film gap is led to the oil return hole from several different longitudinal positions (different branch openings on the spindle bore wall), so as to facilitate the pressure balance or uniformity of various parts of the oil film gap.

[0008] The openings of branch roads can be of any suitable shape.

[0009] Preferably, the openings of some or all branches are annular, perpendicular to the axis.

[0010] Any suitable oil supply and return system can be used to form an oil film with the required pressure in the oil film gap.

[0011] Preferably, the rotary transmission mechanism is a rotating mechanism.

[0012] The belt drive mechanism used as a rotary transmission mechanism can employ any suitable existing technology. For example, it includes a driving pulley (driving belt pulley) and a driven pulley (driven belt pulley), with the driving pulley fixedly mounted on a rotary drive motor (e.g., on the output shaft extension of a motor reducer), and the driven pulley fixedly mounted on a splined shaft. The driving pulley drives the driven pulley to rotate via a transmission belt, which in turn drives the splined shaft and the tailstock main shaft to rotate via the driven pulley.

[0013] Depending on actual needs, belt drive mechanisms may or may not be equipped with guide / support pulleys and tension pulleys.

[0014] Preferably, a slide plate (a plate capable of sliding linearly on the base frame) is provided on the base frame. The slide plate moves longitudinally. A rotary drive motor is fixedly mounted on the slide plate, and the bearing housing of the spline bearing is fixedly mounted on the slide plate via a vertical support plate (e.g., a connecting plate or connecting plate assembly). When the slide plate moves longitudinally, it drives the rotary drive motor, belt drive mechanism, spline bearing, bearing housing, spline shaft, and tailstock main shaft to move longitudinally together.

[0015] Preferably, the tail frame base is provided with a longitudinal drive device for driving the slide plate to move longitudinally.

[0016] The longitudinal traverse drive can employ any suitable existing technology.

[0017] Preferably, the longitudinal movement drive device uses a longitudinally arranged hydraulic cylinder. The cylinder body is fixedly mounted on a base frame in front of the bearing housing, and the piston rod of the cylinder extends rearward, with its outer end fixedly connected to the slide plate. The fixed connection between the outer end of the piston rod and the slide plate can be achieved in any suitable manner; for example, the front end of the piston rod can be fixedly connected to a vertical connector between the slide plate and the bearing housing.

[0018] The oil supply and return system and its control device for the hydraulic cylinder can be set up according to any suitable existing technology.

[0019] Preferably, an adjusting nut is provided at the rear of the spline sleeve. The adjusting nut is screwed (threaded) onto the spline shaft and the driven wheel is clamped (held) between the adjusting nut and the spline sleeve.

[0020] Furthermore, a thrust spring is provided between the spline sleeve and the tailstock spindle.

[0021] The thrust spring can be a helical spring, with its rear end abutting against the front end face of the spline sleeve, and its front end abutting against the tailstock spindle or spline shaft. Depending on actual needs, an annular step or shoulder can be provided on the tailstock spindle or spline shaft, and the front end of the thrust spring abutting against the end face of the step or shoulder.

[0022] The beneficial effects of this utility model are as follows: due to the setting of the rotary tailstock, the headstock and tailstock can jointly drive the workpiece to rotate, which is conducive to improving the coaxiality of the workpiece; due to the suspension support of the tailstock spindle, the tailstock spindle is allowed to move and rotate longitudinally relative to the machine frame. By driving the tailstock spindle to rotate or move longitudinally through the corresponding rotary drive device and longitudinal transfer drive device, not only are the requirements for the rotary tailstock met, but the structure is also simple, the operation is stable, the noise is low, the resistance is low, and the coaxiality of the processed workpiece is high. Attached Figure Description

[0023] Figure 1 This is a front view of the slewing tailstock involved in this utility model; Figure 2 This is a side view of the slewing tailstock involved in this utility model; Figure 3 This is the AA sectional view of the slewing tailstock involved in this paper; Figure 4 This is a schematic diagram of the tailstock main shaft of this utility model with a pressure equalization groove; Figure 5 This is a schematic diagram showing the unfolded surface of the tailstock spindle of this utility model, which is equipped with another type of pressure equalization groove; Figure 6 This is a schematic diagram showing the unfolded surface of the tailstock spindle of this utility model, which is equipped with a third type of pressure equalization groove.

[0024] The markings in the diagram are: 1. Tailstock base; 2. Tailstock spindle; 3. Sheath; 4. Center; 5. Throttling device; 6. Oil supply block; 7. Splined shaft; 8. Thrust spring; 9. Bearing housing; 10. Splined sleeve; 11. Driven pulley; 12. Adjusting nut; 13. Synchronous belt; 14. Piston rod; 15. Slide plate; 16. Linear guide rail; 17. Motor base; 18. Servo motor; 19. Drive pulley; 20. Splined bearing; 21. Oil inlet; 22. Oil return port; 23. Slider; 24. Guide rail; 25. Pressure equalization groove. Detailed Implementation

[0025] See Figures 1 to 3 The upper part of the tailstock base 1 is a main shaft sleeve (a part on the tailstock base for passing through and supporting the tailstock main shaft). The tailstock main shaft, equipped with a center point 4, passes through an axial through hole in the main shaft sleeve, leaving a small gap between it and the axial through hole. This gap connects the oil supply circuit and the oil return circuit. The oil supply pressure forms a pressure oil film between the tailstock main shaft and the axial through hole, supporting the tailstock main shaft and keeping it in a hydraulically suspended state. The two ends of the gap are sealed by a rotary sealing device to prevent oil leakage. The rotary sealing device (including its corresponding structure) can be any suitable existing device, such as the rotary sealing device at both ends of an existing hydrostatic bearing or the rotary sealing device at both ends of a rotary cylinder. An oil supply block 6 and a throttle 5 are provided on the oil supply circuit. The oil inlet for connecting to the external oil circuit is located on the oil supply block, and the oil return port is located on the main shaft sleeve. This suspension support principle is consistent with that of hydrostatic bearings. Therefore, the hydraulic suspension support structure between the main shaft sleeve and the tailstock main shaft can be regarded as a hydrostatic bearing. Unlike common hydrostatic bearings, the axial (longitudinal) dimension of this hydrostatic bearing is much larger than that of conventional hydrostatic bearings. To maintain the balance of oil film thickness and pressure in various parts, higher machining and assembly precision and better oil circuit distribution are required. If necessary, pressure equalization grooves can be set to more effectively introduce oil pressure into various parts, thereby ensuring that the oil film thickness and pressure in each part have the required consistency.

[0026] The rear end of the tailstock main shaft is coaxially (e.g., fastened with bolts) fixedly connected to a splined shaft 7 by screws (the axes are on the same straight line). A thrust spring (e.g., a pre-compressed helical spring) is provided between the front end of the splined sleeve and the rear end of the tailstock main shaft. A splined bearing (e.g., two thrust bearings in opposite directions) is provided on the outer side of the splined sleeve. The splined bearing is rotatably connected to the bearing housing. The lower part of the bearing housing is fixedly connected to the slide plate. A hydraulic cylinder for driving the longitudinal (forward and backward) movement of the slide plate is horizontally set and fixedly installed on the tailstock base. The outer end of its piston rod is fixedly connected to the slide plate, thereby driving the slide plate to move back and forth through the hydraulic cylinder, which in turn drives the bearing housing to move back and forth.

[0027] A servo motor 14 is installed on the skateboard. The servo motor is connected to the spline shaft through a transmission mechanism to drive the spline shaft to rotate. The transmission mechanism can drive a transmission mechanism. Its driving wheel is installed on the shaft extension of the servo motor, and the driven wheel is installed on the spline shaft. The middle part of the spline shaft is provided with an annular stepped protrusion for installing a spline bearing. The driven wheel is fixedly installed on the rear end face of the annular stepped protrusion.

[0028] The splined shaft has an adjusting nut threaded at the rear, used to adjust the compression of the thrust spring, and thus the clamping force of the center on the workpiece. A set screw is located on the side wall of the adjusting nut, securing it to the splined shaft to prevent it from loosening during operation.

[0029] A linear (longitudinal) guide structure is provided between the skateboard and the tail frame base surface located below it, including a slider provided at the bottom of the skateboard and a groove provided at the surface of the tail frame base. The linear (longitudinal) guide structure can be set according to existing technology. For example, two guide rails 24 are provided at the surface of the tail frame base, and sliders (or grooves) 23 that match each guide rail are provided at the bottom of the skateboard.

[0030] See Figures 4 to 6 Uniform (or approximately uniform) pressure-equalizing grooves can be machined on the surface of the tailstock spindle. These grooves can be circumferential annular grooves and / or axial straight grooves, or spiral grooves. Multiple pressure-equalizing grooves are typically used, and grooves in different directions (e.g., circumferential annular grooves and / or axial straight grooves, or spiral grooves with opposite spiral directions) can intersect each other. The depth of the pressure-equalizing grooves (corresponding to the oil film thickness direction) can be significantly greater than the oil film thickness, and the groove width can be set according to actual needs. Therefore, the pressure-equalizing grooves offer very little resistance to oil pressure transmission, effectively transmitting oil pressure to all parts of the annular gap without changing the oil film thickness of the main body. This helps to achieve a balance of oil film thickness and pressure in various parts, better ensuring the coaxiality of the tailstock spindle.

[0031] The working principle of this utility model's rotary tailstock is as follows: The tailstock main shaft 2 is suspended in the tailstock body through the oil supply block 6 and the throttle 5. Because it is suspended by hydraulic pressure, the tailstock main shaft 2 can move axially and rotate. The hydraulic suspension eliminates the mechanical backlash effect, achieving high displacement and rotation accuracy, thus satisfying the functions of clamping and driving the workpiece. The axial movement of the tailstock main shaft is achieved by the piston rod 14 driving the slide plate 15. The slide plate 15 drives the spline shaft 7 and the moving tailstock main shaft 2 forward and backward through the bearing seat 9, spline sleeve 10, and thrust spring 8. The magnitude of the workpiece clamping force is achieved by adjusting the nut 12. The rotational movement of the tailstock main shaft 2 is achieved by the driving pulley 19, synchronous belt 13, driven pulley 11, spline sleeve 10, and spline shaft 7 on the motor shaft of the servo motor 18, which drive the tailstock main shaft 2 to rotate.

[0032] The slewing tailstock of this utility model has the following features: The tailstock spindle is supported by hydrostatic pressure, which can simultaneously satisfy axial and rotary motion. Eliminating the gap between the tailstock spindle and the frame body can achieve high precision and rigidity.

[0033] There is no mechanical contact between the tailstock spindle and the frame, resulting in minimal friction and a significantly extended mechanical lifespan.

[0034] Unless otherwise specified, the preferred and optional technical means disclosed in this utility model can be arbitrarily combined to form several different specific embodiments when one preferred or optional technical means is a further limitation of another technical means.

Claims

1. A dual-drive grinding machine equipped with a rotary tailstock, characterized in that... Its tailstock is a rotary tailstock, which is equipped with a tailstock base and a tailstock main shaft. The upper part of the tailstock base is provided with a main shaft hole for the tailstock main shaft to pass through. The main shaft hole is a longitudinal through hole, and an oil film gap is left between the hole wall and the tailstock main shaft. The tailstock base is provided with an oil inlet and an oil return port that communicate with the oil film gap. A spline shaft is coaxially fixedly connected to the rear end of the tailstock main shaft. A spline sleeve that matches the spline shaft is rotatably installed at the rear of the tailstock base. A rotary drive motor is connected to the spline shaft through a rotary transmission mechanism to drive the spline shaft to rotate.

2. The dual-drive grinding machine with a rotary tailstock as described in claim 1, characterized in that... The two ends of the oil film gap are sealed by a rotary sealing device.

3. The dual-drive grinding machine with a rotary tailstock as described in claim 2, characterized in that... The tailstock base is provided with an oil inlet channel and an oil return channel. The oil inlet channel and / or the oil return channel are provided with several branches. The inner ends of the branches of different oil inlet channels open at different longitudinal positions on the spindle bore wall, and the inner ends of the branches of different oil return channels open at different longitudinal positions on the spindle bore wall.

4. The dual-drive grinding machine with a rotary tailstock as described in claim 3, characterized in that... Some or all of the branch openings are in the form of a ring perpendicular to the axis.

5. The dual-drive grinding machine with a rotary tailstock as described in claim 1, characterized in that... The rotary transmission mechanism is a rotating mechanism.

6. The dual-drive grinding machine with a rotary tailstock as described in claim 5, characterized in that... An adjusting nut is located at the rear of the spline sleeve. The adjusting nut is screwed onto the spline shaft and clamps the driven wheel of the belt drive mechanism between the adjusting nut and the spline sleeve.

7. The dual-drive grinding machine with a rotary tailstock as described in claim 6, characterized in that... A thrust spring is provided between the spline sleeve and the tailstock spindle.

8. The dual-drive grinding machine with a rotary tailstock as described in claim 1, characterized in that... The base frame is equipped with a slide plate, which moves longitudinally. The rotary drive motor is fixedly installed on the slide plate, and the bearing seat of the spline bearing is fixedly installed on the slide plate through a vertical support plate.

9. The dual-drive grinding machine with a rotary tailstock as described in claim 8, characterized in that... The tail frame base is equipped with a longitudinal drive device for driving the slide plate to move longitudinally.

10. The dual-drive grinding machine with a rotary tailstock as described in claim 9, characterized in that... The longitudinal drive device uses a longitudinally arranged hydraulic cylinder. The cylinder body is fixedly mounted on the base frame in front of the bearing seat, and the piston rod of the hydraulic cylinder extends backward, with its outer end fixedly connected to the slide plate.

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