High-load noise reduction vertical machining center

Abstract

The invention discloses a high-load noise reduction vertical machining center, and relates to the technical field of vertical machining centers, the high-load noise reduction vertical machining center comprises a numerical control machine tool body and a tool magazine system, and further comprises two V-shaped blocks arranged at the rear end of the tool magazine system in a bilateral symmetry mode, and sliding assemblies are symmetrically arranged on the front inner wall and the rear inner wall of each V-shaped block; the numerical control machine tool body is vertically and fixedly connected with a guide rail; the sliding component comprises a mounting plate; mounting cavities are formed in the positions, corresponding to the sliding assemblies, in the V-shaped blocks, racks are fixedly connected to the ends, close to the inner walls of the V-shaped blocks, of the mounting plates, nuts are rotationally connected to the sides, corresponding to the racks, of the inner walls of the mounting cavities, the nuts are in threaded connection with vertically-arranged screws, and sliding blocks are slidably connected into the mounting cavities. The self-locking performance of the two mounting plates is eliminated, and the mounting plates move towards the V-shaped block, so that the situation that when thermal expansion occurs, the fit clearance between the guide rail and the roller is reduced, the extrusion force between the guide rail and the roller is increased, the friction force in the transmission process is increased, and the noise of a machining center is increased is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of vertical machining centers, in particular to a high-load noise-reducing vertical machining center. Background Art

[0002] A machining center is a highly automated, multifunctional CNC machine tool with a tool magazine and automatic tool changing device. It consists of a tool magazine system and a machine body. A vertical machining center refers to a machining center with a vertical spindle. Its structure is mostly a fixed column, the worktable is rectangular, and it has no indexing and rotation function. The tool magazine system of the vertical machining center is slidably assembled with the machine body. The tool magazine system cooperates with the machine body to move on a vertical plane to feed the workpiece on the worktable.

[0003] During the use of a vertical machining center, part of the noise comes from the friction of the tool magazine system's feed; the greater the friction, the corresponding noise generated by sliding will also increase. The gap between the tool magazine system and the sliding assembly of a traditional vertical machining center is fixed. When high-speed operation is performed for a long time, the temperature of the assembly between the tool magazine system and the body rises, the metal assembly undergoes thermal expansion, and the assembly gap will decrease, resulting in increased friction and increased noise. Summary of the Invention

[0004] The object of the present invention is to provide a high-load noise-reducing vertical machining center to solve the technical problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-load noise-reducing vertical machining center, comprising a CNC machine tool body and a tool magazine system, and further comprising two V-shaped blocks symmetrically arranged at the rear end of the tool magazine system, wherein the front and rear inner walls of the V-shaped blocks are symmetrically provided with sliding assemblies; The CNC machine tool body is vertically fixedly connected with a guide rail, and the guide rail can be vertically slidably connected with four sets of sliding assemblies; the sliding assemblies include mounting plates symmetrically arranged in the upper and lower parts; The V-shaped block is provided with an installation cavity at the corresponding sliding assembly, and the installation plate is fixedly connected to a rack at one end close to the inner wall of the V-shaped block. The rack passes through the V-shaped block to the corresponding installation cavity, and a spring is fixedly connected between the end of the rack and the inner wall of the installation cavity. A nut is rotatably connected to the side of the inner wall of the installation cavity corresponding to the rack, and the nut is threadedly connected to a vertically arranged screw. A slider is slidably connected to the installation cavity, and the two screw ends corresponding to the same sliding assembly are rotatably connected to the slider in the corresponding installation cavity. The rack is connected to a transmission assembly, and the transmission assembly is connected to the corresponding nut, and the rack can drive the nut to rotate through the transmission assembly.

[0006] The side wall of the mounting plate is rotatably connected to a plurality of rollers arranged in an array in the vertical direction.

[0007] The transmission assembly includes a gear, which is meshed with a rack and rotatably connected to the inner wall of the mounting cavity. The gear is coaxially fixedly connected to a helical gear 1, which is meshed with a helical gear 2, and the helical gear 2 is coaxially fixedly connected to a nut.

[0008] A control mechanism is provided in the slider, and the control mechanism is used to release or start the locking of the screw rod and the slider along its own axis.

[0009] The control mechanism includes two oil grooves provided in the slider, and the positions of the two oil grooves correspond to the two screw rods respectively. A piston is slidably connected in the oil grooves, and the end of the piston close to the screw rod is fixedly connected to a connecting rod; the connecting rod passes through the slider and is fixedly connected to the end of the screw rod, and is slidably connected to the slider; an annular groove is provided at the end of the oil groove close to the screw rod, and the inner diameter of the annular groove is larger than the inner diameter of the oil groove; the oil groove and the annular groove are both provided with an injection hole passing through the slider at the end away from the screw rod, and all the injection holes in the same sliding component are connected to a liquid injection mechanism that can be turned on and off through an external pipeline; the injection hole can absorb or discharge hydraulic oil into the injection mechanism.

[0010] The injection mechanism includes an oil tank, which is fixedly connected to the outer wall of the V-shaped block. The oil tank is penetrated by a through hole with four corresponding injection holes. The through holes are fixedly connected to the pipes connected to the through holes respectively. A valve assembly is provided at the through hole in the oil tank, and the valve assembly is used to control the connection and disconnection between the through hole and the pipe.

[0011] The valve assembly includes a sliding rod that is slidably connected to the inner wall of the oil tank. The sliding rod is fixedly connected to a sealing block at the through hole position. The sliding rod is transmission-connected to a push-pull assembly, which is used to push and pull the sliding rod and maintain it.

[0012] The push-pull assembly includes a bolt threadedly connected to the side wall of the oil tank, the end of the bolt is fixedly connected to a push rod, the end of the push rod passes through the side wall of the oil tank and is fixedly connected to the end of the slide rod, a avoidance cavity is provided in the oil tank, and a partition is elastically and slidably connected in the avoidance cavity, and the partition can isolate the communication between the avoidance cavity and the oil tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The self-locking property of the two mounting plates is eliminated, and the mounting plates move toward the V-shaped block. This avoids: when thermal expansion occurs, the matching clearance between the guide rail and the roller is reduced, resulting in an increase in the extrusion pressure between the two, which increases the friction during the transmission process and further causes the machining center to increase noise.

[0014] When the V-block and the guide rail are spliced ​​and engaged, the self-locking property of the slider is released to reduce the difficulty of installation. After the installation is completed, the self-locking property of the slider is activated to increase the stability of the sliding connection between the CNC machine tool body and the tool magazine system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural diagram of the V-shaped block and its upper components; Figure 3 for Figure 2 Schematic diagram of the half-section structure at the rack; Figure 4 for Figure 3 Schematic diagram of the half-section structure at the installation cavity; Figure 5 for Figure 4 A in the middle and the enlarged schematic diagram of the structure; Figure 6 for Figure 5 Schematic diagram of the half-section structure of the screw; Figure 7 for Figure 6 Schematic diagram of point B and the enlarged structure.

[0016] The accompanying drawings are marked as follows: 1: CNC machine tool body, 2: tool magazine system, 3: V-block, 4: guide rail, 5: mounting plate, 6: mounting cavity, 7: rack, 8: spring, 9: nut, 10: screw, 11: slider, 12: roller, 13: gear, 14: bevel gear 1, 15: bevel gear 2, 16: oil groove, 17: piston, 18: connecting rod, 19: annular groove, 20: liquid injection hole, 21: oil tank, 22: through hole, 23: slide rod, 24: sealing block, 25: bolt, 26: push rod, 27: avoidance cavity, 28: partition. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 7 The present invention provides a technical solution: a high-load noise-reducing vertical machining center, comprising a CNC machine tool body 1 and a tool magazine system 2, further comprising two V-shaped blocks 3 symmetrically arranged at the rear end of the tool magazine system 2, wherein the front and rear inner walls of the V-shaped blocks 3 are symmetrically provided with sliding assemblies; a guide rail 4 is vertically fixedly connected to the CNC machine tool body 1, and the guide rail 4 is vertically slidably connected to four sets of sliding assemblies; the sliding assemblies include mounting plates 5 symmetrically arranged in the upper and lower directions; The V-shaped block 3 is provided with an installation cavity 6 at the corresponding sliding assembly. The end of the installation plate 5 close to the inner wall of the V-shaped block 3 is fixedly connected with a rack 7. The rack 7 passes through the V-shaped block 3 and extends into the corresponding installation cavity 6. A spring 8 is fixedly connected between the end of the rack 7 and the inner wall of the installation cavity 6. A nut 9 is rotatably connected to the side of the inner wall of the installation cavity 6 corresponding to the rack 7. The nut 9 is threadedly connected to a vertically arranged screw 10. A slider 11 is slidably connected in the installation cavity 6. The ends of the two screws 10 corresponding to the same sliding assembly are rotatably connected to the slider 11 in the corresponding installation cavity 6. The rack 7 is transmission-connected with a transmission assembly, and the transmission assembly is transmission-connected to the corresponding nut 9. The rack 7 can drive the nut 9 to rotate through the transmission assembly.

[0018] The side wall of the mounting plate 5 is rotatably connected to a plurality of rollers 12 arranged in an array in the vertical direction.

[0019] The left and right V-shaped blocks 3 are vertically slidably connected to the guide rails 4 through four sets of sliding components, thereby realizing a vertical sliding connection between the CNC machine tool body 1 and the tool magazine system 2; Motion state of a single sliding assembly: Under ideal conditions, when the machining center is not subject to external forces including gravity, the elastic force of the spring 8 causes the rack 7 to tend to move toward the guide rail 4, causing the nut 9, which is connected to the rack 7 through the transmission assembly, to rotate at the same time. This causes the two screws 10 to tend to move in the same direction, causing the slider 11 to slide under the movement trend of the screw 10, and the corresponding rack 7 to move toward the guide rail 4, causing the roller 12 on the mounting plate 5 connected to the rack 7 to squeeze the side wall of the guide rail 4, so that the V-shaped block 3 and the guide rail 4 fit tightly; Under normal conditions, such as Figure 1 It can be seen that the main part of the tool magazine system 2 extends out of the CNC machine tool body 1, so that when the tool magazine system 2 is subjected to external forces including gravity, a certain amount of torque will be generated at the connection between the tool magazine system 2 and the CNC machine tool body 1, that is, the connection between the V-shaped block 3 and the guide rail 4; correspondingly, the upper and lower mounting plates 5 in the same sliding assembly will be subjected to external forces in opposite directions respectively; when a mounting plate 5 is subjected to an extrusion force, its corresponding rack 7 has a tendency to slide into the mounting cavity 6, and through the transmission assembly and the nut 9, the corresponding screw 10 has a tendency to move linearly, so that the screw 10 pushes and pulls the slider 11, and at this time the slider 11 will Push and pull another screw 10 so that it has the same movement trend as the previous screw 10. However, due to the self-locking property between the screw 10 and the nut 9, the screw 10 cannot actively drive the nut 9 to rotate. Since the external force acting on the mounting plate 5 corresponding to the screw 10 is in the opposite direction to the external force acting on the previous mounting plate 5, the two nuts 9 cannot move synchronously, and the corresponding slider 11 and the mounting plate 5 are self-locking. When the two mounting plates 5 do not have the same movement trend, the two mounting plates 5 are self-locking, thus ensuring the stability of the vertical sliding connection between the tool magazine system 2 and the CNC machine tool body 1 during the operation or idle process of the machining center; When the machining center works under high load for a long time, the temperature of the machining center rises, causing the guide rail 4 and the sliding assembly to have a thermal expansion effect; at this time, both mounting plates 5 will be subjected to the extrusion force generated by the metal expansion in the direction of the mounting cavity 6. Based on the above-mentioned movement principle, when the two mounting plates 5 have a tendency to move in the same direction, the self-locking property of the two mounting plates 5 is eliminated, and the mounting plates 5 move toward the V-shaped block 3, thereby avoiding: when thermal expansion occurs, the matching clearance between the guide rail 4 and the roller 12 is reduced, resulting in an increase in the extrusion force between the two, which increases the friction force during the transmission process, and further causes an increase in the noise of the machining center.

[0020] The transmission assembly includes a gear 13, which is meshed with the rack 7 and is rotatably connected to the inner wall of the mounting cavity 6. The gear 13 is coaxially fixedly connected to a bevel gear 14, which is meshed with a bevel gear 2 15, and the bevel gear 2 15 is coaxially fixedly connected to the nut 9.

[0021] A control mechanism is provided in the slider 11 , and the control mechanism is used to release or start the locking of the screw rod 10 with the slider 11 along its own axis.

[0022] By releasing the lock of the screw rod 10 and the slider 11 along its own axis, the two screw rods 10 corresponding to the same slider 11 can move relative to each other, thereby releasing the self-locking property of the slider 11; correspondingly, the two mounting plates 5 can freely move away from or close to the V-shaped block 3, and then when the V-shaped block 3 and the guide rail 4 are spliced ​​and engaged, the self-locking property of the slider 11 is released to reduce the difficulty of installation. After the installation is completed, the self-locking property of the slider 11 is activated to increase the stability of the sliding connection between the CNC machine tool body 1 and the tool magazine system 2.

[0023] Furthermore, the control mechanism includes two oil grooves 16 opened in the slider 11, and the positions of the two oil grooves 16 correspond to the two screws 10 respectively. A piston 17 is slidably connected in the oil grooves 16, and the end of the piston 17 close to the screw 10 is fixedly connected to a connecting rod 18; the connecting rod 18 passes through the slider 11 and is fixedly connected to the end of the screw 10, and is slidably connected to the slider 11; an annular groove 19 is opened at the end of the oil groove 16 close to the screw 10, and the inner diameter of the annular groove 19 is larger than the inner diameter of the oil groove 16, and the ends of the oil groove 16 and the annular groove 19 away from the screw 10 are both provided with an injection hole 20 passing through the slider 11, and all the injection holes 20 in the same sliding component are connected to a liquid injection mechanism that can be turned on and off through an external pipeline; the injection hole 20 can absorb or discharge hydraulic oil into the injection mechanism.

[0024] When the injection mechanism is disconnected from the injection hole 20, the hydraulic oil in the space of the oil grooves 16 on both sides of the piston 17 cannot be discharged, so that the piston 17 cannot slide relative to the oil grooves 16. Furthermore, the screw 10 fixedly connected to the piston 17 by the connecting rod 18 cannot move along its own axial direction, causing the sliding assembly to self-lock; correspondingly, when the injection mechanism is connected to the injection hole 20, the hydraulic oil in the space of the oil grooves 16 on both sides of the piston 17 can be discharged or extracted through the injection hole 20, so that the piston 17 can slide relative to the oil grooves 16, thereby canceling the self-locking of the sliding assembly.

[0025] Furthermore, the injection mechanism includes an oil tank 21, which is fixedly connected to the outer wall of the V-shaped block 3. The oil tank 21 is penetrated by a through hole 22 with four corresponding injection holes 20. The through holes 22 are fixedly connected to the pipes connected to the through holes 22 respectively. A valve assembly is provided at the through hole 22 in the oil tank 21, and the valve assembly is used to control the connection and disconnection between the through hole 22 and the pipe.

[0026] Furthermore, the valve assembly includes a slide rod 23 slidably connected to the inner wall of the oil tank 21. The slide rod 23 is fixedly connected to a sealing block 24 at the position of the through hole 22. The slide rod 23 is transmission-connected to a push-pull assembly, which is used to push and pull the slide rod 23 and maintain it.

[0027] Furthermore, the push-pull assembly includes a bolt 25 threadedly connected to the side wall of the oil tank 21, and the end of the bolt 25 is fixedly connected to a push rod 26. The end of the push rod 26 passes through the side wall of the oil tank 21 and is fixedly connected to the end of the slide rod 23. A avoidance cavity 27 is provided in the oil tank 21, and a partition 28 is elastically slidably connected in the avoidance cavity 27. The partition 28 can isolate the communication between the avoidance cavity 27 and the oil tank 21.

[0028] The sliding of the slide bar 23 is controlled by rotating the bolt 25 , so that the sealing block 24 on the slide bar 23 changes the blocking state of the liquid injection hole 20 .

Claims

1. A high-load noise-reducing vertical machining center, comprising a CNC machine tool body (1) and a tool magazine system (2), characterized in that: The invention comprises two V-shaped blocks (3) symmetrically arranged at the rear end of the tool magazine system (2), and the front and rear inner walls of the V-shaped blocks (3) are symmetrically provided with sliding assemblies; the CNC machine tool body (1) is vertically fixedly connected with a guide rail (4), and the guide rail (4) can be vertically slidably connected with four sets of sliding assemblies; the sliding assemblies include mounting plates (5) symmetrically arranged up and down; the V-shaped blocks (3) are provided with mounting cavities (6) at the positions corresponding to the sliding assemblies, and the mounting plates (5) are fixedly connected with racks (7) at one end close to the inner wall of the V-shaped blocks (3), and the racks (7) pass through the V-shaped blocks (3) to the corresponding mounting cavities (6). A spring (8) is fixedly connected between the end of the rack (7) and the inner wall of the installation cavity (6); a nut (9) is rotatably connected to the side of the inner wall of the installation cavity (6) corresponding to the rack (7); the nut (9) is threadedly connected to a vertically arranged screw (10); a slider (11) is slidably connected in the installation cavity (6); the ends of the two screws (10) corresponding to the same sliding assembly are rotatably connected to the slider (11) in the corresponding installation cavity (6); the rack (7) is transmission-connected to a transmission assembly, and the transmission assembly is transmission-connected to the corresponding nut (9); the rack (7) can drive the nut (9) to rotate through the transmission assembly.

2. The high-load noise-reducing vertical machining center according to claim 1, characterized in that: The side wall of the mounting plate (5) is rotatably connected to a plurality of rollers (12) arranged in an array in the vertical direction.

3. The high-load noise-reducing vertical machining center according to claim 2, characterized in that: The transmission assembly includes a gear (13), the gear (13) is meshed with the rack (7) and is rotatably connected to the inner wall of the mounting cavity (6), the gear (13) is coaxially fixedly connected to a bevel gear 1 (14), the bevel gear 1 (14) is meshed with a bevel gear 2 (15), and the bevel gear 2 (15) is coaxially fixedly connected to the nut (9).

4. The high-load noise-reducing vertical machining center according to claim 2, characterized in that: A control mechanism is provided in the slider (11), and the control mechanism is used to release or start the locking of the screw rod (10) and the slider (11) along its own axis.

5. The high-load noise-reducing vertical machining center according to claim 4, characterized in that: The control mechanism comprises two oil grooves (16) provided in the slider (11), the positions of the two oil grooves (16) respectively corresponding to the two screw rods (10), the oil grooves (16) are slidably connected with pistons (17), and the ends of the pistons (17) close to the screw rods (10) are fixedly connected with connecting rods (18); the connecting rods (18) pass through the slider (11) and are fixedly connected to the ends of the screw rods (10), and are slidably connected to the slider (11); the oil grooves (16) are slidably connected to the two screw rods (10), and the pistons (17) are fixedly connected to the ends of the screw rods (10). ) An annular groove (19) is provided at one end close to the screw (10), the inner diameter of the annular groove (19) is larger than the inner diameter of the oil groove (16), and an injection hole (20) penetrating the slider (11) is provided at one end of the oil groove (16) and the annular groove (19) away from the screw (10). All the injection holes (20) in the same sliding assembly are connected to a liquid injection mechanism that can be turned on and off through an external pipeline; the injection holes (20) can absorb or discharge hydraulic oil into the liquid injection mechanism.

6. The high-load noise-reducing vertical machining center according to claim 5, characterized in that: The injection mechanism comprises an oil tank (21), the oil tank (21) being fixedly connected to the outer side wall of the V-shaped block (3), the oil tank (21) being penetrated by a through hole (22) having four corresponding injection holes (20), the through holes (22) being fixedly connected to pipelines connected to the through holes (22), and a valve assembly being provided at the through hole (22) in the oil tank (21), the valve assembly being used to control the connection and disconnection between the through hole (22) and the pipeline.

7. The high-load noise-reducing vertical machining center according to claim 6, characterized in that: The valve assembly includes a slide rod (23) slidably connected to the inner wall of the oil tank (21), the slide rod (23) is fixedly connected to a sealing block (24) at the position of the through hole (22), and the slide rod (23) is transmission-connected to a push-pull assembly, which is used to push and pull the slide rod (23) and maintain it.

8. The high-load noise-reducing vertical machining center according to claim 7, characterized in that: The push-pull assembly includes a bolt (25) threadedly connected to the side wall of the oil tank (21), the end of the bolt (25) is fixedly connected to a push rod (26), the end of the push rod (26) passes through the side wall of the oil tank (21) and is fixedly connected to the end of the slide rod (23), a relief cavity (27) is provided in the oil tank (21), a partition (28) is elastically slidably connected in the relief cavity (27), and the partition (28) can isolate the communication between the relief cavity (27) and the oil tank (21).

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