CNC high speed double wheel frame bridge housing grinder

Abstract

Provided is a CNC high-speed double-grinding wheel frame bridge housing grinder, with adjustable multi-layer fixed headstock and fixed tailstock fixed at the left and right ends of the workbench respectively, the right end of the workpiece supported on the workbench by a measuring instrument, a bracket and a hydraulic tracking center frame is tightened by the top of the fixed tailstock, the top of the headstock in the adjustable multi-layer fixed headstock tightens the left end of the workpiece, the inner expansion block at the right end of the adjustable multi-layer fixed headstock tightens the inner hole at the left end of the workpiece, and the workpiece is driven to rotate by the servo motor in the adjustable multi-layer fixed headstock; a composite feeding device is provided at the rear end of the plane on the machine bed, and the grinding process of the left and right ends of the workpiece is realized by the composite feeding device and the grinding wheel frame grinding device. The present invention adopts a double-grinding wheel frame grinder structure to realize simultaneous grinding of both ends of the workpiece, and there is no need to turn the workpiece during the grinding process, eliminating the disadvantages of secondary clamping and turning grinding of the workpiece, improving the grinding efficiency of the workpiece, and the grinding cost of the workpiece is low and the grinding effect of the workpiece is good.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control equipment, and in particular relates to a numerically controlled high-speed double-grinding wheel bridge housing grinder. Background Art

[0002] At present, when grinding the outer circle, end face and arc of the shaft head at both ends of the heavy truck bridge housing in China, the single-head grinding method is adopted, that is, a single-head grinder with an end face of a grinding wheel frame is used to perform a forming grinding on the outer circle, end face and arc of the bridge housing using a set of grinding wheels, and then the outer circle, end face and arc of the other end of the bridge housing are manually turned around and ground. The workpiece needs to be turned around once manually, and the production efficiency is low. When the robot is connected at the same time, an automatic line needs to be equipped with two single-head grinders. Each single-head grinder needs to use a hydraulic automatic tracking center frame with a large stroke movement to realize automatic loading and unloading on the single-head grinder, and an automatic robot is required to turn the workpiece around, which greatly increases the manufacturing cost of the single-head grinder and increases the manufacturing difficulty and cost of the robot. Therefore, it is necessary to make improvements to the above problems. Summary of the invention

[0003] The technical problem solved by the present invention is as follows: a CNC high-speed double-grinding wheel frame bridge housing grinder is provided, by arranging a compound feeding device on the flat rear end of the machine tool bed, and the grinding processing of the left and right ends of the workpiece is completed by the grinding wheel frame grinding device arranged on the compound feeding device, thereby solving the problem of workpiece turning when a single-head grinder processes a workpiece that requires double-head grinding. There is no need to turn the workpiece during the grinding process, thereby eliminating the disadvantages of secondary clamping and turning grinding of the workpiece, greatly improving the grinding efficiency of the workpiece, reducing the grinding cost of the workpiece, and achieving good workpiece grinding effect.

[0004] There is no need to turn the workpiece during the grinding process, which eliminates the disadvantages of secondary clamping and turning the workpiece for grinding, greatly improves the grinding efficiency of the workpiece, reduces the grinding cost of the workpiece, and achieves good grinding effect.

[0005] The technical solution adopted by the present invention is as follows: a CNC high-speed double-grinding wheel frame bridge housing grinder, which has a machine tool bed, a workbench is provided on the flat front end of the machine tool bed, and an adjustable multi-layer fixed headstock and a fixed tailstock are respectively fixed at the left and right ends of the workbench. The right end of the workpiece supported on the workbench by a measuring instrument, a bracket and a hydraulic tracking center frame is tightened by the top point on the fixed tailstock, the top point of the headstock in the adjustable multi-layer fixed headstock tightens the left end of the workpiece, and the inner expansion block at the right end of the adjustable multi-layer fixed headstock tightens the inner hole of the left end of the workpiece, and the workpiece is driven to rotate by the servo motor in the adjustable multi-layer fixed headstock; a composite feeding device is provided on the flat rear end of the machine tool bed, and the grinding processing of the left and right ends of the workpiece is realized by the composite feeding device and the grinding wheel frame grinding device arranged on the composite feeding device.

[0006] Wherein, the adjustable multi-layer fixed head frame includes a head frame lower layer, a head frame middle layer, a head frame upper layer, a cylinder, a head frame top, a head frame spindle, a servo motor, a long rod and a rotary cylinder, the head frame lower layer is fixed on the workbench, a linear guide is laid in the length direction of the upper plane of the lower layer of the head frame, and the head frame middle layer is installed on the head frame lower layer through the linear guide, the rotating shaft of the upper plane of the head frame middle layer is inserted into the hole of the bottom plane of the head frame upper layer, and the head frame middle layer and the head frame upper layer are fixedly connected by bolts, the cylinder is fixed on the head frame lower layer and the end of the cylinder piston rod is fixedly connected to the connecting plate fixed on the middle layer of the head frame, and the movement of the head frame middle layer and the head frame upper layer along the length direction of the linear guide is realized by the extension and retraction of the cylinder piston rod; the head frame main The shaft is rotatably installed on the upper layer of the head frame, and the driving pulley fixed on the output shaft of the servo motor installed in the upper layer of the head frame is connected to the driven pulley fixed on the left end of the head frame main shaft through a belt. The rotary cylinder is installed on the left end of the head frame main shaft, and the rotary cylinder piston rod is fixedly connected to the left end of the long rod arranged inside the head frame main shaft, the right end of the head frame main shaft is fixedly connected to the left end of the head frame top located outside the upper layer of the head frame, and the left end of the pull rod that matches the clearance of the center hole of the head frame top is fixedly connected to the right end of the long rod, and the right end of the pull rod is a conical structure. After the upper layer of the head frame moves to the right, it drives the head frame top and the inner expansion block at the right end of the head frame top to be inserted into the left end hole of the workpiece, and the pull rod is driven to move by the extension and retraction of the rotary cylinder piston rod to realize the tightening or loosening of the workpiece by the inner expansion block.

[0007] Furthermore, the dovetail groove on the bottom surface of the lower layer of the head frame is adapted to the workbench, and the clamping screws fix the lower layer of the head frame to the workbench by fixing the lower layer of the head frame to the workbench with the clamping plate adapted to the boss on the side wall of the lower layer of the head frame.

[0008] Furthermore, the lower end of the rotating shaft is interference fit with the hole provided on the upper plane of the middle layer of the head frame, and the upper end of the rotating shaft is gap fit with the hole on the bottom plane of the upper layer of the head frame. The middle layer of the head frame and the upper layer of the head frame are connected by bolts, and the rotation angle of the upper layer of the head frame is adjusted by loosening the bolts and rotating the upper layer of the head frame with the rotating shaft as the center.

[0009] Furthermore, the composite feeding device comprises two sets of Z-direction feeding devices which are arranged on the rear end of the plane of the machine tool bed and are located in the same feeding direction, and an X-direction feeding device which is arranged on the Z-direction feeding device. The X-direction feeding devices which are respectively arranged on the two sets of Z-direction feeding devices at an angle are arranged symmetrically with each other. The Z-direction feeding device comprises a longitudinal support plate and an AC servo motor ball screw. A flat V-shaped plastic guide rail is arranged on the machine tool bed and the longitudinal support plate is arranged on the flat V-shaped plastic guide rail. The AC servo motor is installed on the machine tool bed, and the output shaft of the AC servo motor is connected to the input shaft of the reducer. The output shaft of the reducer is connected to the end of the screw in the ball screw which is located below the longitudinal support plate and is rotatably supported on the machine tool bed through a coupling. The nut in the ball screw is connected to the The longitudinal support plate is fixedly connected, and the AC servo motor drives the screw in the ball screw to rotate to realize the movement of the longitudinal support plate along the Z direction; the X-direction feeding device includes a transverse pad, a linear guide rail I, a transverse support plate and an AC servo motor I, the transverse pad is fixed to the longitudinal support plate, and the transverse pad and the transverse support plate are connected through the linear guide rail I, the AC servo motor I is installed on the transverse pad, the screw end of the ball screw I rotatably supported on the transverse pad is fixedly connected to the output shaft of the AC servo motor I through a coupling I, the nut in the ball screw I is fixedly connected to the transverse support plate, and the AC servo motor I drives the screw in the ball screw I to rotate to realize the movement of the transverse support plate and the grinding device of the grinding wheel frame installed on the transverse support plate along the X direction.

[0010] Furthermore, the grinding wheel frame grinding device includes a grinding wheel motor, a driving pulley I, a driven pulley I, a grinding wheel and a grinding wheel shaft. The grinding wheel motor is installed on the grinding wheel frame and the grinding wheel frame is fixed on a transverse support plate in the composite feeding device. The driving pulley I is fixed on the output shaft of the grinding wheel motor. The grinding wheel shaft is rotatably installed on the grinding wheel frame and the driving pulley I is connected to the driven pulley I at one end of the grinding wheel shaft through a belt. After the grinding wheel motor drives the grinding wheel shaft to rotate, the grinding wheel installed at the other end of the grinding wheel shaft completes the grinding of the workpiece end.

[0011] Furthermore, both ends of the workpiece are provided with a measuring instrument, a bracket and a hydraulic tracking center frame, and the measuring instrument and the bracket are provided with a measuring instrument for measuring the diameter of the workpiece at the grinding processing position.

[0012] The advantages of the present invention compared with the prior art are:

[0013] 1. This technical solution solves the problem of workpiece turning when a single-head grinder processes a workpiece that needs double-head grinding by arranging a compound feeding device on the rear end of the plane of the machine tool bed, and the grinding wheel frame grinding device arranged on the compound feeding device completes the grinding processing of the left and right ends of the workpiece. The workpiece does not need to be turned during the grinding process, eliminating the disadvantages of secondary clamping and turning grinding of the workpiece;

[0014] 2. This technical solution adopts a composite feeding device formed by two sets of Z-direction feeding devices at the rear end of the plane on the machine bed and located in the same feeding direction and an X-direction feeding device arranged on the Z-direction feeding device, which provides the required adjustment conditions for the grinding position of the grinding wheel frame grinding device installed on the X-direction feeding device on the workpiece, ensuring that the grinding wheel in the grinding wheel frame grinding device effectively grinds the outer circle, end surface and arc of the two ends of the workpiece;

[0015] 3. This technical solution uses the mechanism that the expansion block at the top end of the headstock is tightened or loosened by the extension of the piston rod of the rotary oil cylinder. On the one hand, it reduces the difficulty of loading and unloading the workpiece by the manipulator, and on the other hand, it improves the clamping efficiency of the workpiece;

[0016] 4. This technical solution can not only control the size of the workpiece cylindrical grinding online and provide measurement conditions for the precision of the workpiece cylindrical size, but also improve the grinding rigidity of the workpiece and ensure the grinding quality of the workpiece by arranging the measuring instrument, bracket and hydraulic tracking center frame support structure at both ends of the workpiece.

[0017] 5. This technical solution has a compact structure and novel design, which greatly improves the grinding efficiency of the workpiece, reduces the grinding cost of the workpiece, has a good workpiece grinding effect, and has a high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the structure of the present invention;

[0019] Figure 2 It is a top view of the structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the workpiece support structure of the present invention;

[0021] Figure 4 The adjustable multi-layer fixed head frame of the present invention;

[0022] Figure 5 It is a side view of the internal structure of the adjustable multi-layer fixed head frame of the present invention;

[0023] Figure 6 It is a schematic diagram of the installation structure of the composite feeding device and the grinding wheel frame grinding device of the present invention;

[0024] Figure 7 for Figure 6 Middle AA section view. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-7 An embodiment of the present invention is described to clearly and completely describe the technical solution. Obviously, the described embodiment is only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0027] CNC high speed double wheel frame bridge housing grinder, such as Figure 1-3 As shown, there is a machine tool bed 1, a workbench 2 is provided at the front end of the upper plane of the machine tool bed 1, and an adjustable multi-layer fixed headstock 3 and a fixed tailstock 4 are fixed to the left and right ends of the workbench 2 respectively. The right end of a workpiece 7 supported on the workbench 2 by a measuring instrument, a bracket 5 and a hydraulic tracking center frame 6 is tightened by the top point on the fixed tailstock 4, the headstock top point 3-1 in the adjustable multi-layer fixed headstock 3 tightens the left end of the workpiece 7, and the inner expansion block 3-16 at the right end of the adjustable multi-layer fixed headstock 3 tightens the inner hole of the left end of the workpiece 7, and the workpiece 7 is driven to rotate by the servo motor 3-2 in the adjustable multi-layer fixed headstock 3; a compound feeding device 8 is provided at the rear end of the upper plane of the machine tool bed 1, and the grinding processing of the left and right ends of the workpiece 7 is realized by the compound feeding device 8 and the grinding device 9 of the grinding wheel frame arranged on the compound feeding device 8.

[0028] like Figure 4-5As shown, specifically, the adjustable multi-layer fixed head frame 3 includes a head frame lower layer 3-6, a head frame middle layer 3-7, a head frame upper layer 3-8, a cylinder 3-9, a head frame top 3-1, a head frame spindle 3-3, a servo motor 3-2, a long rod 3-4 and a rotary cylinder 3-5, the head frame lower layer 3-6 is fixed on the workbench 2, a linear guide rail 3-10 is laid on the length direction of the upper plane of the head frame lower layer 3-6, and the head frame middle layer 3-7 is installed on the head frame lower layer 3-6 through the linear guide rail 3-10, the rotating shaft 3-11 of the upper plane of the head frame middle layer 3-7 is inserted into the hole of the bottom plane of the head frame upper layer 3-8, and the head frame middle layer 3-7 and the head frame upper layer 3-8 are screwed together. The oil cylinder 3-9 is fixedly connected with the headstock lower layer 3-6 and the end of the piston rod of the oil cylinder 3-9 is fixedly connected with the connecting plate 3-12 fixed with the middle layer 3-7 of the headstock, and the movement of the middle layer 3-7 of the headstock and the upper layer 3-8 of the headstock along the length direction of the linear guide rail 3-10 is realized by the extension and contraction of the piston rod of the oil cylinder 3-9; the headstock main shaft 3-3 is rotatably installed on the upper layer 3-8 of the headstock, and the driving pulley 3-14 fixed on the output shaft of the servo motor 3-2 installed in the upper layer 3-8 of the headstock is connected with the driven pulley 3-13 fixed on the left end of the headstock main shaft 3-3 through the belt 3-15, and the rotary oil cylinder 3-5 is installed at the left end of the headstock main shaft 3-3 , and the piston rod of the rotary oil cylinder 3-5 is fixedly connected to the left end of the long rod 3-4 arranged inside the head frame main shaft 3-3, the right end of the head frame main shaft 3-3 is fixedly connected to the left end of the head frame top 3-1 located outside the head frame upper layer 3-8, and the left end of the pull rod 3-17 that matches the clearance of the center hole of the head frame top 3-1 is fixedly connected to the right end of the long rod 3-4, and the right end of the pull rod 3-17 is a conical structure. After the head frame upper layer 3-8 moves to the right, the head frame top 3-1 and the internal expansion block 3-16 at the right end of the head frame top 3-1 are inserted into the left end hole of the workpiece 7, and the pull rod 3-17 is driven by the extension and retraction of the piston rod of the rotary oil cylinder 3-5 to realize the tightening or loosening of the workpiece 7 by the internal expansion block 3-16; Specifically, the dovetail groove on the bottom surface of the head frame lower layer 3-6 is adapted to the workbench 2, and the clamping screw 3-18 fixes the head frame lower layer 3-6 and the pressure plate 3-19 adapted to the boss on the side wall of the head frame lower layer 3-6 to fix the head frame lower layer 3-6 on the workbench 2; Specifically, the lower end of the rotating shaft 3-11 has an interference fit with the hole provided on the upper plane of the head frame middle layer 3-7, and the upper end of the rotating shaft 3-11 has a clearance fit with the hole on the bottom plane of the head frame upper layer 3-8, the head frame middle layer 3-7 is connected to the head frame upper layer 3-8 by bolts, and the rotation angle of the head frame upper layer 3-8 is adjusted by loosening the bolts and rotating the head frame upper layer 3-8 with the rotating shaft 3-11 as the center;In the above structure, the cylinder body at one end of the rotary oil cylinder 3-5 can rotate relative to the piston rod at the other end. Therefore, when installing, the cylinder body at one end of the rotary oil cylinder 3-5 is fixedly installed on the left end of the head frame main shaft 3-3 by bolts, and the piston rod at the other end of the rotary oil cylinder 3-5 is fixedly connected to the left end of the long rod 3-4 inside the head frame main shaft 3-3. When the head frame main shaft 3-3 rotates, the cylinder body at one end of the rotary oil cylinder 3-5 rotates synchronously with the head frame main shaft 3-3, while the cylinder body at the other end of the rotary oil cylinder 3-5 does not rotate. ;

[0029] In the above structure, the lower layer 3-6 of the head frame is pressed on the workbench 2 by the pressure plate 3-19 and the tightening screw 3-18, the middle layer 3-7 of the head frame is installed on the lower layer 3-6 of the head frame by the linear guide 3-10, and the middle layer 3-7 of the head frame can be moved relative to the lower layer 3-6 of the head frame through the guide block of the linear guide 3-10; the upper layer 3-8 of the head frame is connected to the middle layer 3-7 of the head frame by bolts, and the upper layer 3-8 of the head frame can be rotated to a certain small angle through the rotating shaft 3-11, which is used for small taper adjustment of the upper layer 3-8 of the head frame.

[0030] The telescopic movement of the piston rod of the oil cylinder 3-9 drives the connecting plate 3-12, and then drives the lower layer 3-6 of the head frame, thereby realizing the movement of the upper layer 3-8 of the head frame and the middle layer 3-7 of the head frame, so that the top 3-1 of the head frame and the inner expansion block 3-16 enter the inner hole at the end of the workpiece 7, the top 3-1 of the head frame presses against the left end of the workpiece 7, and tightens the inner hole of the workpiece 7 through the inner expansion block 3-16, thereby driving the workpiece 7 to rotate; the tightening of the inner expansion block 3-16 drives the long rod 3-4 to extend or retract through the extension (extending) and retraction (retreating) of the piston rod of the rotary oil cylinder 3-5 The servo motor 3-2 is controlled to rotate by the electrical system, and the belt 3-15, the driving pulley 3-14 and the driven pulley 3-13 are used to drive the head frame main shaft 3-3 to rotate, thereby driving the head frame top 3-1, the inner expansion block 3-16 and the workpiece 7 to rotate.

[0031] like Figure 6-7As shown, specifically, the composite feeding device 8 includes two sets of Z-direction feeding devices 8-1 arranged at the rear end of the plane on the machine tool bed 1 and located in the same feeding direction, and an X-direction feeding device 8-2 arranged on the Z-direction feeding device. The X-direction feeding devices 8-2 arranged on the two sets of Z-direction feeding devices 8-1 are arranged symmetrically with each other at an angle. The Z-direction feeding device 8-1 includes a longitudinal support plate 8-1-1 and an AC servo motor 8-1-2 and a ball screw 8-1-3. The machine tool bed 1 is provided with a flat V-shaped plastic guide rail and a longitudinal support plate 8-1-1 is arranged on a flat V-shaped plastic guide rail, the AC servo motor 8-1-2 is installed on the machine tool bed 1, and the output shaft of the AC servo motor 8-1-2 is connected to the input shaft of the reducer 8-1-4, the output shaft of the reducer 8-1-4 is connected to the end of the screw in the ball screw 8-1-3 located below the longitudinal support plate 8-1-1 and rotatably supported on the machine tool bed 1 through a coupling 8-1-5, the nut in the ball screw 8-1-3 is fixedly connected to the longitudinal support plate 8-1-1, and is connected to the machine tool bed 1 through the AC servo motor 8 -1-2 drives the screw in the ball screw 8-1-3 to rotate to realize the movement of the longitudinal support plate 8-1-1 along the Z direction; the X-direction feeding device 8-2 includes a transverse pad 8-2-1, a linear guide rail I 8-2-2, a transverse support plate 8-2-3 and an AC servo motor I 8-2-4, the transverse pad 8-2-1 is fixed on the longitudinal support plate 8-1-1, and the transverse pad 8-2-1 and the transverse support plate 8-2-3 are connected by a linear guide rail I 8-2-2, and the AC servo motor I 8-2-4 is installed on the transverse On the pad 8-2-1, the end of the screw in the ball screw I8-2-6 rotatably supported on the transverse pad 8-2-1 is fixedly connected to the output shaft of the AC servo motor I8-2-4 through a coupling I8-2-5, and the nut in the ball screw I8-2-6 is fixedly connected to the transverse support plate 8-2-3, and the screw in the ball screw I8-2-6 is driven to rotate by the AC servo motor I8-2-4 to realize the movement of the transverse support plate 8-2-3 and the grinding wheel frame grinding device 9 installed on the transverse support plate 8-2-3 along the X direction.

[0032] In the above structure, the grinding wheel frame grinding device 9 can realize the X-direction and Z-direction movement, thereby realizing the dressing of the grinding wheel 9 - 4 in the grinding wheel frame grinding device 9 and the grinding of the workpiece 7. A flat V-shaped plastic guide rail is provided on the machine tool bed 1. The longitudinal support plates 8-1-1 located at the left and right ends of the machine tool bed 1 move left and right on the flat V-shaped plastic guide rail. The AC servo motor 8-1-2 is controlled to rotate by the numerical control system. The AC servo motor 8-1-2 drives the screw in the ball screw 8-1-3 to rotate, so as to realize the movement of the longitudinal support plate 8-1-1 fixedly connected with the nut in the ball screw 8-1-3 along the Z direction; the AC servo motor I8-2-4 is controlled to rotate by the numerical control system. The AC servo motor I8-2-4 drives the screw in the ball screw I8-2-6 to rotate through the coupling I8-2-5, so as to realize the movement of the transverse support plate 8-2-3 fixedly connected with the nut in the ball screw I8-2-6 and the grinding wheel frame grinding device 9 installed on the transverse support plate 8-2-3 along the X direction, thereby realizing the combination of the grinding wheel frame grinding device 9 in the X direction and the Z direction;

[0033] like Figure 6 As shown, specifically, the grinding wheel frame grinding device 9 includes a grinding wheel motor 9-1, a driving pulley Ⅰ9-2, a driven pulley Ⅰ9-3, a grinding wheel 9-4 and a grinding wheel shaft 9-5, the grinding wheel motor 9-1 is installed on the grinding wheel frame 9-6 and the grinding wheel frame 9-6 is fixed on the transverse support plate 8-2-3 in the composite feeding device 8, the driving pulley Ⅰ9-2 is fixed on the output shaft of the grinding wheel motor 9-1, the grinding wheel shaft 9-5 is rotatably installed on the grinding wheel frame 9-6 and the driving pulley Ⅰ9-2 is connected to the driven pulley Ⅰ9-3 at one end of the grinding wheel shaft 9-5 through a belt, and the grinding wheel motor 9-1 drives the grinding wheel shaft 9-5 After rotation, the grinding wheel 9-4 installed at the other end of the grinding wheel shaft 9-5 completes the grinding of the end of the workpiece 7; specifically, both ends of the workpiece 7 are provided with a measuring instrument and a bracket 5 and a hydraulic tracking center frame 6, and the measuring instrument and the measuring instrument with a forward and backward moving function on the bracket 5 are used to measure the diameter of the workpiece 7 at the grinding processing point. The supporting structure of the measuring instrument and the bracket 5 and the hydraulic tracking center frame 6 are set at both ends of the workpiece 7. On the one hand, the grinding position of the workpiece 7 is measured in real time by the measuring instrument and the measuring instrument on the bracket 5. On the other hand, the grinding rigidity of the workpiece 7 is improved by the hydraulic tracking center frame 6 arranged at both ends of the workpiece 7.

[0034] In the above structure, the grinding wheel motor 9-1 drives the active pulley Ⅰ9-2 to rotate, and drives the driven pulley Ⅰ9-3 connected to one end of the grinding wheel shaft 9-5 to rotate through the belt transmission, and drives the grinding wheel shaft 9-5 to rotate through the friction force of the cone of the grinding wheel shaft 9-5, thereby driving the grinding wheel 9-4 to rotate, and grinding the outer circle, end face and arc of the workpiece 7; the rotation of the two grinding wheel motors 9-1 is controlled by the CNC system, and the two grinding wheel motors 9-1 can be controlled to rotate at the same time, so as to realize the simultaneous grinding of the two ends of the workpiece 7, and the left and right shaft heads of the workpiece 7 can be ground at one time; in this structure, the X-direction and Z-direction movement of the grinding wheel 9-4 can be realized, thereby realizing the dressing of the grinding wheel 9-4 and the grinding of the workpiece 7. This structure is equipped with a hydraulic action oil tank to provide pressure for the movement of the head frame upper layer 3-8, the forward and backward movement of the measuring instrument and the measuring instrument on the bracket 5, and the movement of the hydraulic tracking center frame 6. It is equipped with a guide rail lubricating oil tank to provide lubrication for the Z-direction guide rail, and is equipped with an electric box, a lubricating oil tank for the grinding wheel shaft 9-5, a cooling water tank, a control panel, and a fully enclosed protection for the machine tool. The control panel is fixed on the fully enclosed protection and can rotate around the rotating shaft for easy operation; the drive of the workpiece 7 is tightened by the six inner expansion blocks 3-16 installed on the top of the head frame 3-1 to tighten the inner hole at the end of the workpiece 7, so that the friction between the six inner expansion blocks 3-16 and the inner hole wall at the end of the workpiece is used to drive the workpiece 7 to rotate.

[0035] In order to realize the automatic upper and lowering of the workpiece by the manipulator (robot), the moving structure of the upper end of the adjustable multi-layer fixed head frame 3 adopts a double-layer structure. When the manipulator places the workpiece 7 on the two measuring instruments and the bracket 5 and the hydraulic tracking center frame 6, the extension and contraction of the piston rod of the cylinder 3-9 realizes the movement of the middle layer 3-7 of the head frame and the upper layer 3-8 of the head frame along the length direction of the linear guide 3-10, so that the top 3-1 of the head frame and the internal expansion block 3-16 at the right end are inserted into the left end hole of the workpiece 7, and then the top of the tail frame 4 is fixed to press the right end of the workpiece 7 to realize automatic clamping of the workpiece 7, and then the rotation of the head frame spindle 3-3 is driven by the servo motor 3-2 to drive the workpiece 7 to rotate.

[0036] The technical solution solves the problem of workpiece 7 turning around when a single-head grinder processes a workpiece 7 that needs double-head grinding by arranging a compound feeding device 8 at the rear end of the plane on the machine tool bed 1, and the grinding wheel frame grinding device 9 arranged on the compound feeding device 8 completes the grinding processing of the left and right ends of the workpiece 7. During the grinding process, there is no need to turn the workpiece 7 around, eliminating the disadvantage of secondary clamping and turning grinding of the workpiece 7. The compound feeding device 8 formed by two sets of Z-direction feeding devices located at the rear end of the plane on the machine tool bed 1 and located in the same feeding direction and an X-direction feeding device arranged on the Z-direction feeding device provides the required adjustment conditions for the grinding position of the grinding wheel frame grinding device 9 installed on the X-direction feeding device on the workpiece 7, ensuring that the grinding wheel in the grinding wheel frame grinding device 9 is aligned with the workpiece The outer circle, end face and arc of both ends of workpiece 7 can be effectively ground; the mechanism of tightening or loosening the inner expansion block 3-16 at the end of the head frame top 3-1 is driven by the extension and contraction of the piston rod of the rotary cylinder 3-5, which reduces the difficulty of loading and unloading the workpiece 7 by the manipulator, and improves the clamping efficiency of the workpiece 7 on the other hand. By arranging the supporting structure of the measuring instrument, the bracket 5 and the hydraulic tracking center frame 6 at both ends of the workpiece 7, not only the size of the outer circle grinding of the workpiece 7 can be controlled online, and the measurement conditions can be provided for the accuracy of the outer circle size of the workpiece 7, but also the grinding rigidity of the workpiece 7 can be improved to ensure the grinding quality of the workpiece 7. The structure is compact and the design is novel, which greatly improves the grinding efficiency of the workpiece 7 and reduces the grinding cost of the workpiece 7. The workpiece 7 has a good grinding effect and has a high use value.

[0037] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A CNC high-speed double-grinding-wheel bridge housing grinding machine, comprising a machine bed (1), wherein a workbench (2) is provided at the front end of the upper plane of the machine bed (1), and characterized in that: The left and right ends of the workbench (2) are respectively fixed with an adjustable multi-layer fixed headstock (3) and a fixed tailstock (4); the right end of a workpiece (7) supported on the workbench (2) by a measuring instrument and a bracket (5) and a hydraulic tracking center frame (6) is tightened by a top on the fixed tailstock (4); the top of the headstock (3-1) in the adjustable multi-layer fixed headstock (3) tightens the left end of the workpiece (7); and the inner expansion block (3-16) at the right end of the adjustable multi-layer fixed headstock (3) tightens the inner hole of the left end of the workpiece (7), and the workpiece (7) is driven to rotate under the drive of the servo motor (3-2) in the adjustable multi-layer fixed headstock (3); a composite feeding device (8) is provided at the rear end of the upper plane of the machine tool bed (1), and the grinding process of the left and right ends of the workpiece (7) is realized by the composite feeding device (8) and a grinding wheel frame grinding device (9) provided on the composite feeding device (8); The adjustable multi-layer fixed head frame (3) comprises a head frame lower layer (3-6), a head frame middle layer (3-7), a head frame upper layer (3-8), a cylinder (3-9), a head frame top (3-1), a head frame spindle (3-3), a servo motor (3-2), a long rod (3-4) and a rotary cylinder (3-5); the head frame lower layer (3-6) is fixed on the workbench (2); a linear guide rail (3-10) is laid on the upper plane of the head frame lower layer (3-6) in the length direction; and the head frame middle layer (3-7) is installed on the head frame lower layer (3-6) via the linear guide rail (3-10). The rotating shaft (3-11) on the upper plane of the middle layer (3-7) of the head frame is inserted into the hole on the bottom plane of the upper layer (3-8) of the head frame, and the middle layer (3-7) of the head frame is fixedly connected with the upper layer (3-8) of the head frame by bolts, the oil cylinder (3-9) is fixed on the lower layer (3-6) of the head frame, and the end of the piston rod of the oil cylinder (3-9) is fixedly connected with the connecting plate (3-12) fixed on the middle layer (3-7) of the head frame, and the movement of the middle layer (3-7) of the head frame and the upper layer (3-8) of the head frame along the length direction of the linear guide rail (3-10) is achieved by telescoping the piston rod of the oil cylinder (3-9); The frame main shaft (3-3) is rotatably mounted on the head frame upper layer (3-8), the driving pulley (3-14) fixed on the output shaft of the servo motor (3-2) installed in the head frame upper layer (3-8) is connected to the driven pulley (3-13) fixed to the left end of the head frame main shaft (3-3) through a belt (3-15), the rotary cylinder (3-5) is installed on the left end of the head frame main shaft (3-3), and the piston rod of the rotary cylinder (3-5) is fixedly connected to the left end of the long rod (3-4) arranged inside the head frame main shaft (3-3), and the right end of the head frame main shaft (3-3) is connected to the upper layer (3-8) of the head frame. 3-8) The left end of the headstock top (3-1) on the outside is fixedly connected, and the left end of the pull rod (3-17) that matches the clearance of the center hole of the headstock top (3-1) is fixedly connected to the right end of the long rod (3-4), and the right end of the pull rod (3-17) is a conical structure. After the headstock upper layer (3-8) moves to the right, it drives the headstock top (3-1) and the inner expansion block (3-16) at the right end of the headstock top (3-1) to be inserted into the left end hole of the workpiece (7), and the pull rod (3-17) is driven to move by the extension and contraction of the piston rod of the rotary cylinder (3-5) to achieve the tightening or loosening of the workpiece (7) by the inner expansion block (3-16); The composite feeding device (8) comprises two sets of Z-direction feeding devices (8-1) arranged at the rear end of the plane on the machine tool bed (1) and located in the same feeding direction, and an X-direction feeding device (8-2) arranged on the Z-direction feeding device, the X-direction feeding devices (8-2) arranged on the two sets of Z-direction feeding devices (8-1) are arranged symmetrically with each other at an angle, the Z-direction feeding device (8-1) comprises a longitudinal support plate (8-1-1) and an AC servo motor (8-1-2) and a ball screw (8-1-3), the machine tool bed (1) is provided with a flat V-shaped plastic guide rail and the longitudinal support plate (8-1-1) The AC servo motor (8-1-2) is mounted on a flat V-shaped plastic guide rail, and the output shaft of the AC servo motor (8-1-2) is connected to the input shaft of the reducer (8-1-4). The output shaft of the reducer (8-1-4) is connected to the end of the screw in a ball screw (8-1-3) located below the longitudinal support plate (8-1-1) and rotatably supported on the machine tool bed (1) through a coupling (8-1-5). The nut in the ball screw (8-1-3) is fixedly connected to the longitudinal support plate (8-1-1) and is rotated by the AC servo motor (8-1-2). The ball screw (8-1-3) is driven to rotate to realize the movement of the longitudinal support plate (8-1-1) along the Z direction; the X-direction feeding device (8-2) includes a transverse pad (8-2-1), a linear guide rail I (8-2-2), a transverse support plate (8-2-3) and an AC servo motor I (8-2-4); the transverse pad (8-2-1) is fixed on the longitudinal support plate (8-1-1), and the transverse pad (8-2-1) and the transverse support plate (8-2-3) are connected through the linear guide rail I (8-2-2); the AC servo motor I (8-2-4) is installed on the transverse pad The end of the screw in the ball screw I (8-2-6) rotatably supported on the transverse pad (8-2-1) is fixedly connected to the output shaft of the AC servo motor I (8-2-4) through a coupling I (8-2-5), the nut in the ball screw I (8-2-6) is fixedly connected to the transverse support plate (8-2-3), and the screw in the ball screw I (8-2-6) is driven by the AC servo motor I (8-2-4) to rotate, so that the transverse support plate (8-2-3) and the grinding wheel frame grinding device (9) installed on the transverse support plate (8-2-3) move along the X direction; The grinding wheel frame grinding device (9) comprises a grinding wheel motor (9-1), a driving pulley I (9-2), a driven pulley I (9-3), a grinding wheel (9-4) and a grinding wheel shaft (9-5); the grinding wheel motor (9-1) is mounted on a grinding wheel frame (9-6) and the grinding wheel frame (9-6) is fixed on a transverse support plate (8-2-3) in a composite feeding device (8); the driving pulley I (9-2) is fixed on an output shaft of the grinding wheel motor (9-1); the grinding wheel shaft (9-5) is rotatably mounted on the grinding wheel frame (9-6) and the driving pulley I (9-2) is connected to a driven pulley I (9-3) at one end of the grinding wheel shaft (9-5) via a belt; after the grinding wheel motor (9-1) drives the grinding wheel shaft (9-5) to rotate, the grinding wheel (9-4) mounted on the other end of the grinding wheel shaft (9-5) completes the grinding of the end of the workpiece (7).

2. The CNC high-speed double-grinding wheel frame bridge housing grinder according to claim 1, characterized in that: The dovetail groove on the bottom surface of the head frame lower layer (3-6) is adapted to the workbench (2), and the clamping screw (3-18) securely connects the head frame lower layer (3-6) and a clamping plate (3-19) adapted to the boss on the side wall of the head frame lower layer (3-6) to achieve the fixation of the head frame lower layer (3-6) on the workbench (2).

3. The CNC high-speed double-grinding wheel frame bridge housing grinder according to claim 2, characterized in that: The lower end of the rotating shaft (3-11) is interference-fitted with a hole provided on the upper plane of the middle layer (3-7) of the head frame, and the upper end of the rotating shaft (3-11) is gap-fitted with a hole on the bottom plane of the upper layer (3-8) of the head frame. The middle layer (3-7) of the head frame is connected to the upper layer (3-8) of the head frame by bolts, and the rotation angle of the upper layer (3-8) of the head frame is adjusted by loosening the bolts and rotating the upper layer (3-8) of the head frame with the rotating shaft (3-11) as the center.

4. The CNC high-speed double-grinding wheel frame bridge housing grinder according to claim 1, 2 or 3, characterized in that: Both ends of the workpiece (7) are provided with a measuring instrument and a bracket (5) and a hydraulic tracking center frame (6), and a measuring instrument for measuring the diameter of the grinding processing portion of the workpiece (7) is provided on the measuring instrument and the bracket (5).

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