CN219379716U

CN219379716U - Overhead gear box ram structure of gantry machining center

Info

Publication number: CN219379716U
Application number: CN202223545356.2U
Authority: CN
Inventors: 刘勇; 马飞虎
Original assignee: Jiangxi Qiaoyang Cnc Equipment Co ltd
Current assignee: Jiangxi Qiaoyang Cnc Equipment Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-07-21
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a top gearbox ram structure of a gantry machining center, which belongs to the technical field of gantry machining center equipment accessories and comprises a base and a workbench, wherein two sides of the workbench are respectively provided with a stand column, the upper ends of the two stand columns are connected with a cross beam together, the cross beam is horizontally and slidingly connected with a sliding seat, the sliding seat is vertically and slidingly connected with a ram, the bottom of the ram is provided with a main shaft, the main shaft is coaxially connected with a transmission shaft, a high-speed gear pinion and a low-speed gear large gear are sequentially sleeved on the transmission shaft from top to bottom, and the transmission shaft is matched with a gearbox for use. The main shaft power adopts gear transmission, so that the transmission efficiency is high, and the failure rate is low; the spindle gear box adopts a high-low grade mode, so that the high-speed finish machining requirement can be met, the low-speed high-torque machining requirement can be met, and the machining efficiency of the machine tool is greatly improved. The spindle gear box is far away from the machine tool spindle in an overhead mode, heat dissipation is good, heat generated by the spindle motor cannot affect the spindle, and machining precision can be improved.

Description

Overhead gear box ram structure of gantry machining center

Technical Field

The utility model relates to the technical field of gantry machining center equipment accessories, in particular to a top gearbox ram structure of a gantry machining center.

Background

The gantry machining center belongs to a machine tool and is widely applied to high-end manufacturing industries such as molds, aviation, aerospace, rail transit, automobiles, household appliances, medical treatment and the like. The gantry machining center comprises a base, a workbench moving on a line rail of the base and upright posts fixed on two sides of the base, wherein a cross beam is fixed at the top of each upright post, a sliding seat capable of moving left and right is arranged on the line rail of the cross beam, and a ram capable of moving up and down is arranged on the sliding seat. The lower end of the ram is provided with a main shaft for machining and cutting, and the outside of the ram is provided with a main shaft motor for driving the main shaft to rotate.

The traditional mode is that the main shaft motor transmits power to the main shaft through the synchronous belt, and the defect is that the synchronous belt is not large enough in transmission torque and is easy to cause tooth jumping or breakage of the synchronous belt. In addition, the spindle driving motor of the ram is generally arranged outside the ram and near the spindle, and protrudes out of the ram by about 300mm to the right, so that an interference area is easily formed with a machined part when the deep cavity part is machined, and the machining range of the machine tool is reduced. In addition, the position of the spindle motor is too close to the spindle, and heat generated by the spindle motor is easily transferred to the spindle, so that the spindle is thermally stretched, and the machining precision is affected.

In order to solve the above problems, we propose a top gearbox ram structure of a gantry machining center.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, provides a top gearbox ram structure of a gantry machining center, and provides the following technical scheme for solving the technical problems in the prior art:

the utility model provides a top gearbox ram structure of a gantry machining center, which comprises a base of the gantry machining center, wherein a workbench is arranged on the base, upright posts are respectively arranged on two sides of the workbench, the upper ends of the two upright posts are connected with a cross beam together, the cross beam is horizontally and slidably connected with a slide seat, a ram is vertically and slidably connected with the slide seat, a main shaft is arranged at the bottom of the ram, a transmission shaft is coaxially connected with the main shaft, a high-speed gear pinion and a low-speed gear bull gear are sequentially sleeved on the transmission shaft from top to bottom, and the transmission shaft is matched with a gearbox for use.

In the overhead gearbox ram structure of the gantry machining center, the gearbox comprises motor teeth, the motor teeth are arranged on a motor shaft of a spindle motor, a spline shaft is arranged on the gearbox, a transmission gear is arranged on the spline shaft and meshed with the motor teeth, power can be further transmitted to the spline shaft from the spindle motor, a low-speed gear pinion is arranged on the spline shaft, a high-speed gear large gear is arranged on the low-speed gear pinion, a gear shifting fork is arranged on the high-speed gear large gear, a gear shifting cylinder is arranged at the top of the ram, a piston rod of the gear shifting cylinder is fixed on the gear shifting fork, and the gear shifting fork moves up and down along the spline shaft under the driving of the gear shifting cylinder and drives the low-speed gear pinion and the high-speed gear large gear to move up and down.

In the overhead gearbox ram structure of the gantry machining center, when the piston rod of the gear shifting oil cylinder moves to the lower limit position, the low-speed gear pinion is meshed with the low-speed gear large gear arranged on the transmission shaft, and the transmission ratio is 1:1.

In the overhead gearbox ram structure of the gantry machining center, when the piston rod of the gear shifting oil cylinder moves to the upper limit position, the high-speed gear large gear is meshed with the high-speed gear small gear arranged on the transmission shaft, and the gear is in a low gear at the moment, and the transmission ratio is 4:1.

In the overhead gearbox ram structure of the gantry machining center, the support is arranged on the ram, the balance oil cylinder is vertically arranged on the sliding seat, and the telescopic rod of the balance oil cylinder is connected with the support.

In the overhead gearbox ram structure of the gantry machining center, the transmission shaft is connected with the main shaft through the coupler.

In the overhead gearbox ram structure of the gantry machining center, two ends of the transmission shaft are respectively connected to the ram in a rotating manner through the first bearing seat and the second bearing seat.

In the overhead gearbox ram structure of the gantry machining center, an adjusting pad for adjusting the center height is arranged below the second bearing, and the thickness of the adjusting pad is ground by measuring the center heights of the transmission shaft and the main shaft during assembly, so that machining errors with high center are compensated.

Compared with the prior art, the utility model has the beneficial effects that: the main shaft power adopts gear transmission, so that the transmission efficiency is high, and the failure rate is low; the spindle gear box adopts a high-low grade mode, so that the high-speed finish machining requirement can be met, the low-speed high-torque machining requirement can be met, and the machining efficiency of the machine tool is greatly improved. The spindle gear box is far away from the machine tool spindle in a top-mounted mode, heat dissipation is good, heat generated by the spindle motor cannot affect the spindle, and machining precision can be improved; an adjusting pad for adjusting the center height is arranged below the second bearing and used for compensating the machining error of the center height; the processing degree of difficulty of ram has been reduced, produce effort to the support through setting up balanced hydro-cylinder, act on the hydro-cylinder piston through hydraulic pressure, produce ascending thrust and balance ram weight, lighten the load of Z axle motor and lead screw, the life of extension lead screw, through measuring the center height of transmission shaft and main shaft during the equipment, grind the thickness of adjusting the pad, be used for compensating the high processing error in center, leave the clearance between the bearing mounting hole on first bearing frame and the ram, can adjust the axiality error with the center of main shaft through the position of removal first bearing frame. Therefore, the requirement on the machining concentricity of the bearing seat mounting hole at the upper end of the ram and the spindle mounting hole at the lower end is greatly reduced, and the problem that the machining concentricity of the bearing seat mounting hole at the upper end of the ram and the spindle mounting hole at the lower end of the ram is difficult to process and guarantee is solved.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:

FIG. 1 is a schematic view of an assembled structure of the present utility model;

FIG. 2 is an isometric cross-sectional view of an overhead gearbox ram in a high gear state in an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of an overhead gearbox ram in a low gear state according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of an overhead gearbox ram in a high gear state according to an embodiment of the present utility model.

In the figure: 1-base, 2-workbench, 3-upright post, 4-main shaft, 5-gear box, 501-motor tooth, 502-transmission gear, 503-spline shaft, 504-shift fork, 505-high gear big gear, 506-low gear small gear, 507-high gear small gear, 508-low gear big gear, 6-crossbeam, 7-slide, 8-balance cylinder, 9-bracket, 10-main shaft motor, 11-transmission shaft, 12-first bearing seat, 13-second bearing seat, 14-coupling, 15-shift cylinder, 16-ram and 17-adjusting pad.

Detailed Description

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Examples

Referring to fig. 1-4, an overhead gear box ram structure of a gantry machining center comprises a base 1 of the gantry machining center, a workbench 2 is installed on the base 1, two upright posts 3 are respectively arranged on two sides of the workbench 2, the upper ends of the two upright posts 3 are connected with a cross beam 6 together, a sliding seat 7 is horizontally connected with the cross beam 6 in a sliding manner, a ram 16 is vertically connected with the sliding seat 7 in a sliding manner, a main shaft 4 is installed at the bottom of the ram 16, a transmission shaft 11 is coaxially connected with the main shaft 4, a high-speed pinion 507 and a low-speed gear wheel 508 are sequentially sleeved on the transmission shaft 11 from top to bottom, the transmission shaft 11 is matched with a gear box 5, in this embodiment, the gear box 5 comprises motor teeth 501, the motor teeth 501 are installed on a motor shaft of a main shaft motor 10, a spline shaft 503 is arranged on the gear box 5, a transmission gear 502 is installed on the spline shaft 503, the transmission gear 502 is meshed with the motor teeth 501, and further, power can be transmitted from the spindle motor 10 to the spline shaft 503, a low-speed pinion 506 is mounted on the spline shaft 503, a high-speed bull gear 505 is mounted on the low-speed pinion 506, a shift fork 504 is mounted on the high-speed bull gear 505, a shift cylinder 15 is mounted on the top of the ram 16, a piston rod of the shift cylinder 15 is fixed on the shift fork 504, so that the shift fork 504 moves up and down along the spline shaft 503 under the driving of the shift cylinder 15, and drives the low-speed pinion 506 and the high-speed bull gear 505 to move up and down, in this embodiment, when a high-speed small torque is required, that is, when the piston rod of the shift cylinder 15 moves to a lower limit position, the low-speed pinion 506 is meshed with the low-speed bull gear 508 mounted on the transmission shaft 11, and the transmission ratio is 1:1, in this embodiment, when a low-speed large torque is required, that is, when the piston rod of the shift cylinder 15 moves to the upper limit position, the high-speed gear wheel 505 meshes with a high-speed gear pinion 507 mounted on the transmission shaft 11, which is a low-speed gear at this time, and the transmission ratio is 1:4.

In the embodiment, a bracket 9 is arranged on a ram 16, a balance oil cylinder 8 is vertically arranged on a sliding seat 7, a telescopic rod of the balance oil cylinder 8 is connected with the bracket 9, acting force is generated on the bracket through the arrangement of the balance oil cylinder, hydraulic pressure acts on an oil cylinder piston to generate upward thrust to balance the weight of the ram, the load of a Z-axis motor and a screw rod is reduced, and the service life of the screw rod is prolonged.

In this embodiment, the transmission shaft 11 is connected with the main shaft 4 through the coupling 14, so that the influence of the coaxiality error of the transmission shaft 11 and the main shaft 4 on the rotation of the transmission shaft and the main shaft 4 is reduced.

In this embodiment, the two ends of the transmission shaft 11 are rotatably connected to the ram 16 by installing the first bearing seat 12 and the second bearing seat 13, so that the transmission shaft 11 can be rotatably connected to the ram 16.

Since the center heights of the transmission shaft 11 and the main shaft 4 will deviate during assembly, resulting in the intersection of assembly accuracy, in this embodiment, an adjusting pad 17 for adjusting the center height is disposed below the second bearing seat 13, and during assembly, the thickness of the adjusting pad 17 is ground by measuring the center heights of the transmission shaft 11 and the main shaft 4, so as to compensate for the machining error of the center height, and a gap is left between the first bearing seat 12 and the bearing mounting hole on the ram 16, so that the coaxiality error with the center of the main shaft 4 can be adjusted by moving the position of the first bearing seat 12. Therefore, the requirement on the machining concentricity of the bearing seat mounting hole at the upper end of the ram 16 and the spindle mounting hole at the lower end is greatly reduced, and the problem that the machining concentricity of the bearing seat mounting hole at the upper end of the ram and the spindle mounting hole at the lower end is difficult to process and guarantee is solved.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

Finally, it should be noted that: the above is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that the present utility model is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a overhead gear box ram structure of longmen machining center, its characterized in that, base (1) including longmen machining center, install workstation (2) on base (1), workstation (2) both sides respectively are equipped with stand (3), two the upper end of stand (3) is connected with crossbeam (6) jointly, horizontal sliding connection has slide (7) on crossbeam (6), vertical sliding connection has ram (16) on slide (7), main shaft (4) are installed to ram (16) bottom, coaxial coupling has transmission shaft (11) on main shaft (4), top-down is equipped with high-speed gear pinion (507), low-speed gear (508) in proper order on transmission shaft (11), transmission shaft (11) and gear box (5) cooperation use.

2. The overhead gearbox ram structure of a gantry machining center according to claim 1, wherein the gearbox (5) comprises motor teeth (501), the motor teeth (501) are arranged on a motor shaft of a spindle motor (10), a spline shaft (503) is arranged on the gearbox (5), a transmission gear (502) is arranged on the spline shaft (503), the transmission gear (502) is meshed with the motor teeth (501), power can be further transferred from the spindle motor (10) to the spline shaft (503), a low-gear pinion (506) is arranged on the spline shaft (503), a high-gear bull gear (505) is arranged on the low-gear pinion (506), a shifting fork (504) is arranged on the high-gear bull gear (505), a shifting cylinder (15) is arranged on the top of the ram (16), a piston rod of the shifting cylinder (15) is fixed on the shifting fork (504), and the shifting fork (504) moves up and down along the spline shaft (503) under the spline cylinder (15) to drive the low-gear pinion (506), and the high-gear bull gear (505) moves up and down.

3. The overhead gearbox ram structure of a gantry machining center according to claim 2, wherein when a piston rod of the gear shifting cylinder (15) moves to a lower limit position, the low gear pinion (506) is meshed with a low gear large gear (508) installed on the transmission shaft (11), and is in a high gear at this time, and the transmission ratio is 1:1.

4. The overhead gearbox ram structure of a gantry machining center according to claim 2, wherein when a piston rod of the gear shifting cylinder (15) moves to an upper limit position, the high-speed gear large gear (505) is meshed with a high-speed gear small gear (507) installed on the transmission shaft (11), and is in a low-speed gear at this time, and the transmission ratio is 1:4.

5. The overhead gearbox ram structure of the gantry machining center according to claim 1, wherein a support (9) is installed on the ram (16), a balance cylinder (8) is vertically installed on the sliding seat (7), and a telescopic rod of the balance cylinder (8) is connected with the support (9).

6. The overhead gearbox ram structure of a gantry machining center according to claim 1, wherein the transmission shaft (11) is connected with the main shaft (4) through a coupling (14).

7. The overhead gearbox ram structure of the gantry machining center according to claim 1, wherein two ends of the transmission shaft (11) are respectively connected to the ram (16) in a rotating manner through a first bearing seat (12) and a second bearing seat (13).

8. A top mounted gearbox ram structure for a gantry machining centre according to claim 7, characterised in that an adjusting pad (17) for adjusting the centre height is arranged below the second bearing (13), and that the thickness of the adjusting pad (17) is ground during assembly by measuring the centre heights of the drive shaft (11) and the main shaft (4) for compensating for machining errors of the centre height.