Adjustable machining table for surface grinding machine

Abstract

The utility model relates to an adjustable machining table for a surface grinding machine, which solves the problems of low rotation precision and weak load capacity of the traditional machining table through the collaborative design of a base, a rotary working table assembly, a lifting driving device and a transverse feeding mechanism. The rotary worktable adopts a stepping motor, a harmonic reducer and a rectangular gear set for transmission, and is combined with sliding fit of a radial limiting ring and an annular guide rail groove, so that back clearance is eliminated, and vibration is inhibited; according to the transverse feeding mechanism, a servo motor drives a ball screw to drive a grinding unit to move horizontally, and the movement precision is ensured through cooperation with a linear guide groove. The auxiliary guide assembly provides lateral support through an L-shaped guide rod. By means of the structure, high-precision control over workpiece rotation and stability of grinding feeding are achieved, and the device is suitable for precision machining scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of surface grinder, concretely is a kind of adjustable processing platform for surface grinder. BACKGROUND

[0002] As precision machining equipment, the performance of the processing platform of the surface grinder directly affects the surface quality and machining accuracy of the workpiece. The conventional adjustable processing platform for surface grinder has the following technical bottlenecks: first, the rotary transmission system usually adopts ordinary gear or worm gear structure, which has the problems of large backlash, low transmission efficiency, easy wear during long-term operation, etc., and it is difficult to meet the requirements of high-precision machining for rotary stability and position repeatability; second, the load capacity is limited, especially under heavy load or high-speed rotation conditions, radial runout or vibration easily occurs, resulting in accumulation of machining errors; third, the translation adjustment mechanism relies on manual operation or simple electric push rod, and lacks precise position feedback and dynamic compensation mechanism, which cannot meet the fine adjustment requirements of complex curved surface machining. In addition, the guide structure of the existing processing platform is usually single-sided constrained, and the anti-unload capacity is weak, which further aggravates the instability factors in the machining process. The above defects seriously restrict the application of the surface grinder in high-precision and high-efficiency machining scenarios. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides an adjustable processing platform for surface grinder, which has the advantages of high rotary precision, strong load capacity and good running stability, and solves the problems of low angle adjustment precision, weak load capacity and large machining error caused by easy shaking during rotation of the existing processing platform.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] An adjustable processing platform for surface grinder, comprising:

[0006] a base;

[0007] a rotary workbench assembly arranged inside the base, the rotary workbench assembly comprising a stepper motor, a harmonic reducer, a reduction rod, a driving rectangular gear, a driven rectangular gear, a transmission shaft, a connecting flange and a workbench body connected in sequence, and a radial limiting ring fixedly installed on the outer wall of the connecting flange;

[0008] the base is internally provided with an annular guide rail groove matched with the radial limiting ring, and the radial limiting ring and the annular guide rail groove are in sliding fit;

[0009] a workpiece clamping device arranged above the rotary workbench assembly;

[0010] a lifting drive device arranged above the base;

[0011] A crossbeam is fixedly installed at the movable end of the lifting driving device;

[0012] A transverse feeding mechanism is arranged inside the crossbeam, and the transverse feeding mechanism comprises a servo motor, a ball screw, a sliding block and a guide block.

[0013] A linear guide groove is arranged inside the crossbeam and is matched with the guide block.

[0014] An auxiliary guide assembly is arranged at the end of the crossbeam, and the auxiliary guide assembly comprises an L-shaped guide rod and a fixed support.

[0015] A controller is arranged at the front side wall of the base, and the controller is electrically connected with the stepping motor, the servo motor and the lifting driving device.

[0016] Further, the input end of the harmonic reducer is fixedly connected with the first transmission shaft, the output end of the harmonic reducer is fixedly connected with the reduction rod, and the driving rectangular gear and the driven rectangular gear are in meshing connection.

[0017] Further, the transverse feeding mechanism further comprises two groups of bearings, the bearings are arranged in the sliding groove of the crossbeam, and the inner rings of the bearings are fixedly connected with the ball screw.

[0018] Further, the workbench body is fixedly connected with the transmission shaft through the connecting flange, and the transmission shaft is in transmission connection with the driving rectangular gear through the driven rectangular gear.

[0019] Further, the sliding block and the grinding unit are fixedly connected through fasteners.

[0020] Further, the L-shaped guide rod is fixedly connected with the end of the crossbeam, and the fixed support is fixedly connected with the side wall of the base.

[0021] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0022] High-precision rotation control: Through the rotation workbench assembly composed of integrated stepper motor and harmonic reducer, combined with the meshing transmission of rectangular gear set, the pulse-level accurate control of the workbench body is realized. The flexible gear characteristics of the harmonic reducer effectively eliminate the transmission backlash, cooperate with the radial constraint of the radial limiting ring, significantly reduce the radial runout and vibration in the rotation process, ensure the stability and position repeatability of the workpiece rotation, and are suitable for high-precision grinding machining.

[0023] Strong load and wide adaptability: The high reduction ratio design of the harmonic reducer converts the "high speed low torque" of the stepper motor into "low speed high torque" output, improves the load capacity of the system, and can adapt to workpieces of different weights and sizes.

[0024] Precise feeding adjustment: The transverse feeding mechanism adopts servo motor driven ball screw and sliding block screw pair transmission, combined with the support design of double bearing and the trajectory constraint of guide block, realizes the high-precision linear translation of the grinding unit. The structure has fast response speed, high positioning accuracy, and dynamic anti-bias load capacity, and is suitable for fine machining of complex curved surfaces.

[0025] Multiple guiding and stabilizing mechanisms: The auxiliary guiding assembly provides bidirectional guiding constraint for the lifting driving device through the sliding cooperation of the L-shaped guiding rod and the fixed support, avoids the deviation and shaking of the cross beam during translation, and further enhances the radial stability of the rotation system through the cooperation of the annular guide groove in the base and the radial limiting ring, thereby improving the reliability of the machining process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic view of the utility model;

[0027] Figure 2 It is a structural front view of the utility model;

[0028] Figure 3 It is a structural front view of the utility model Figure 2 It is an enlarged view of A in the middle;

[0029] Figure 4 It is a structural front view of the utility model.

[0030] In the diagram: 1. Base; 2. Rotary worktable assembly; 202. First drive shaft; 203. Stepper motor; 204. Harmonic reducer; 205. Reducer bar; 206. Driving rectangular gear; 208. Drive shaft; 209. Driven rectangular gear; 210. Connecting flange; 211. Radial limit ring; 212. Worktable body; 3. Workpiece clamping device; 4. Lifting drive device; 5. Crossbeam; 6. Transverse feed mechanism; 601. Slide; 602. Bearing; 603. Servo motor; 604. Ball screw; 605. Slider; 606. Guide block; 7. Grinding unit; 8. Auxiliary guide assembly; 801. L-shaped guide rod; 802. Fixed support; 9. Controller. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] like Figures 1 to 4 As shown, the adjustable machining table for a surface grinder provided in this embodiment mainly includes a base 1, a rotary table assembly 2, a workpiece clamping device 3, a lifting drive device 4, a crossbeam 5, a transverse feed mechanism 6, a grinding unit 7, an auxiliary guide assembly 8, and a controller 9. All components work together to achieve high-precision rotary grinding of the workpiece. The workpiece clamping device 3 and the lifting drive device 4 are existing technologies and will not be described in detail here.

[0033] The remaining functional components are described in detail below:

[0034] I. Rotary Table Assembly

[0035] The rotating workbench assembly 2 is arranged inside the base 1 and includes a stepping motor 203, a harmonic reducer 204, a reduction rod 205, a driving rectangular gear 206, a driven rectangular gear 209, a transmission shaft 208, a connecting flange 210 and a workbench body 212. The stepping motor 203 is fixed to the right side of the base 1 through a support, and the output end of the stepping motor 203 is connected with one end of the first transmission shaft 202. The other end of the first transmission shaft 202 is connected with the input end of the harmonic reducer 204. The output end of the harmonic reducer 204 is connected with one end of the reduction rod 205, and the other end of the reduction rod 205 is provided with the driving rectangular gear 206. One end of the transmission shaft 208 is vertically arranged on the base 1 through a bearing, and the other end is connected with the workbench body 212 through the connecting flange 210. The outer wall of the connecting flange 210 is fixedly provided with a radial limiting ring 211, and the inner wall of the base 1 is provided with an annular guide groove matched with the radial limiting ring 211, so as to form a sliding fit relationship and limit the radial deviation of the workbench during rotation. The driven rectangular gear 209 is arranged on the transmission shaft 208 and meshes with the driving rectangular gear 206.

[0036] The connecting flange 210 is uniformly provided with a plurality of lightening holes to reduce the moment of inertia. The radial limiting ring 211 is integrally formed with the connecting flange 210.

[0037] The harmonic reducer 204 adopts the flexible gear meshing principle and has the characteristics of zero backlash and high stiffness, which can convert the high speed and low torque of the stepping motor into low speed and high torque output.

[0038] In the embodiment, the stepping motor 203 is started after receiving the pulse signal of the controller 9, and the harmonic reducer 204 is used for speed reduction and torque increase, the reduction rod 205 is driven to rotate the driving rectangular gear 206. The driving rectangular gear 206 meshes with the driven rectangular gear 209 to drive the transmission shaft 208 and the workbench body 212 to rotate synchronously. The cooperation of the radial limiting ring 211 and the annular guide groove ensures the radial stability of the workbench during rotation, avoiding shaking caused by centrifugal force.

[0039] The stepping motor 203 supports pulse-level precise control, and the stable speed reduction ratio of the harmonic reducer 204 can realize precise positioning of the rotating angle of the workbench ±0.01°. The high torque output of the harmonic reducer 204 can drive large weight workpieces to rotate, which is suitable for heavy part machining. The driving rectangular gear 206 and the driven rectangular gear 209 are made of high-strength alloy steel, and the tooth surface is treated by carburizing and quenching, so that the wear resistance is significantly improved.

[0040] II. Transverse feeding mechanism

[0041] The transverse feeding mechanism 6 comprises a servo motor 603, a ball screw 604, a sliding block 605 and a guide block 606, and the bottom of the sliding block 605 is fixedly connected with the grinding unit 7. The servo motor 603 is installed on the mounting plate at the left end of the cross beam 5 through a flange, and the output shaft thereof is connected with the left end of the ball screw 604 through a shaft coupling. The ball screw 604 horizontally penetrates through the inside of the cross beam 5 and is supported at both ends by two groups of bearings 602 which are embedded in the sliding grooves 601 in the inner wall of the cross beam 5. The nut on the ball screw 604 is fixedly connected with the sliding block 605. The guide block 606 is welded on the top of the sliding block 605 and is in sliding fit with the linear guide groove in the inner wall of the cross beam 5, so as to ensure that the sliding block 605 translates along a single axis. The bottom of the sliding block 605 is fixed with the grinding unit 7 through M8 inner hexagonal bolts, and the grinding unit 7 can adopt a general grinding tool such as a grinding wheel or a diamond grinding head.

[0042] In the embodiment, the servo motor 603 reverses rotation after receiving the instruction of the controller 9, and drives the ball screw 604 to rotate. The ball screw 604 drives the sliding block 605 to translate left and right along the linear guide groove in the cross beam 5, so as to realize the horizontal feeding of the grinding unit 7. The gap between the guide block 606 and the linear guide groove is controlled to be less than 0.02 mm, so as to ensure the straightness of the movement.

[0043] The combination of the servo motor and the ball screw can realize a feeding accuracy of 0.001 mm / pulse, which meets the requirement of precision grinding. The servo motor has a short start-stop time, and can quickly complete complex path processing in cooperation with the controller. The ball screw 604 is supported by the two bearings 602, which effectively suppresses the deformation of the ball screw caused by the grinding resistance and has the characteristics of strong anti-unbalanced load capacity.

[0044] III. Auxiliary guiding assembly

[0045] The auxiliary guiding assembly 8 comprises an L-shaped guiding rod 801 and a fixed support 802, the fixed support 802 is provided with a guiding groove, and the L-shaped guiding rod 801 is vertically welded at the end of the cross beam 5 and the lower extension section thereof is inserted into the guiding groove of the fixed support 802. The fixed support 802 is fixed with the side wall of the base 1 through foundation bolts, and the inner side thereof is provided with a polytetrafluoroethylene wear-resistant lining plate. The L-shaped guiding rod 801 and the guiding groove of the fixed support 802 form an H-shaped sliding pair, which can absorb the slight displacement caused by the thermal expansion of the equipment, maintain the rigidity of the system, and allow the cross beam 5 to slightly float in the vertical direction to compensate for the thermal deformation.

[0046] In the embodiment, when the lifting driving device 4 adjusts the height of the cross beam 5, the L-shaped guiding rod 801 slides along the guiding groove of the fixed support 802 to provide lateral support for the cross beam 5, prevent the cross beam 5 from being deviated in the transverse direction due to gravity or cutting force, and jointly act with the linear guide groove in the cross beam 5 to form X-Y bidirectional constraint, so as to completely eliminate the deviation phenomenon in the translation process. The polytetrafluoroethylene lining plate reduces the friction resistance and prolongs the service life.

[0047] In this embodiment, the controller 9 adopts an industrial PLC controller integrated with a touch screen operation interface.

[0048] Working process:

[0049] Clamping workpiece: the workpiece to be processed is fixed on the center of the workbench body 212 through the workpiece clamping device 3.

[0050] Coarse height adjustment: operate the lifting drive device 4 to lower the grinding unit 7 close to the workpiece surface.

[0051] Rotation calibration: input the target angle through the controller 9, and the stepping motor 203 drives the workbench body 212 to rotate to the specified position.

[0052] Precise grinding: start the servo motor 603 to complete the reciprocating grinding of the workpiece surface at the preset feed speed.

[0053] Unloading and resetting: after processing is completed, the lifting drive device 4 lifts the cross beam 5, removes the workpiece and resets all coordinate axes.

[0054] Key improvement point verification

[0055] Prior art deficiencies The utility model Verification effect Large rotation backlash Harmonic reducer + rectangular gear set Rotation error under no load / full load ≤0.02° Translation trajectory deviation Ball screw + linear guide groove + L-shaped guide rod Linear error ≤0.01mm within 100mm stroke Obvious heavy load vibration Double bearing support + radial limiting ring + H-shaped sliding pair 50 kg load < 0.005 mm Low manual adjustment efficiency PLC + servo motor + stepper motor full-automatic control Single-piece processing time reduced by more than 40%

[0056] Through the above structural design, the utility model realizes the technical target of high rotation precision, strong load capacity and stable operation, and is especially suitable for the precise grinding scene of difficult-to-machine materials such as optical glass and hard alloy.

[0057] It should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0058] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable machining table for a surface grinder, characterized in that: Base (1); A rotary table assembly (2) is located inside the base (1). The rotary table assembly (2) includes a stepper motor (203), a harmonic reducer (204), a reducer (205), a driving rectangular gear (206), a driven rectangular gear (209), a drive shaft (208), a connecting flange (210), and a table body (212) connected in sequence. A radial limiting ring (211) is fixedly installed on the outer wall of the connecting flange (210). The base (1) has an annular guide groove inside that is adapted to the radial limiting ring (211), and the radial limiting ring (211) slides in conjunction with the annular guide groove. The workpiece clamping device (3) is located above the rotary table assembly (2); A lifting drive device (4) is located above the base (1); The crossbeam (5) is fixedly installed at the movable end of the lifting drive device (4); A transverse feed mechanism (6) is located inside the crossbeam (5). The transverse feed mechanism (6) includes a servo motor (603), a ball screw (604), a slider (605), and a guide block (606). An installation groove is opened on the crossbeam (5). The ball screw (604) is horizontally installed in the installation groove. Both ends of the ball screw (604) are supported by bearings (602). The output end of the servo motor (603) is connected to one end of the ball screw (604). The nut on the ball screw (604) is fixedly connected to the slider (605). The bottom of the slider (605) is fixedly connected to the grinding unit (7). The crossbeam (5) has a linear guide groove inside that is adapted to the guide block (606), and the guide block (606) slides in conjunction with the linear guide groove. An auxiliary guide assembly (8) is provided at the end of the crossbeam (5). The auxiliary guide assembly (8) includes an L-shaped guide rod (801) and a fixed support (802). The L-shaped guide rod (801) is slidably connected to the fixed support (802), and the fixed support (802) is fixedly connected to the base (1). The controller (9) is located on the front side wall of the base (1). The controller (9) is electrically connected to the stepper motor (203), the servo motor (603) and the lifting drive device (4).

2. The adjustable machining table for a surface grinder according to claim 1, characterized in that: The input end of the harmonic reducer (204) is fixedly connected to the first transmission shaft (202), and the output end of the harmonic reducer (204) is fixedly connected to the reducer rod (205). The driving rectangular gear (206) and the driven rectangular gear (209) are in a meshing connection.

3. The adjustable machining table for a surface grinder according to claim 1, characterized in that: The transverse feed mechanism (6) also includes two sets of bearings (602), which are located in the grooves (601) of the crossbeam (5), and the inner rings of the bearings (602) are fixedly connected to the ball screw (604).

4. The adjustable machining table for a surface grinder according to claim 1, characterized in that: The workbench body (212) is fixedly connected to the drive shaft (208) through the connecting flange (210), and the drive shaft (208) is connected to the driving rectangular gear (206) through the driven rectangular gear (209).

5. An adjustable machining table for a surface grinder according to claim 1, characterized in that: The slider (605) is fixedly connected to the grinding unit (7) by fasteners.

6. An adjustable machining table for a surface grinder according to claim 1, characterized in that: The L-shaped guide rod (801) is fixedly connected to the end of the crossbeam (5), and the fixed support (802) is fixedly connected to the side wall of the base (1).

Images