Workbench lifting mechanism

Abstract

The utility model belongs to the technical field of machine tool workbench moving auxiliary mechanisms, and particularly relates to a workbench lifting mechanism which comprises a lifting module and is characterized in that the lifting module comprises an eccentric cam assembly and a swing rod assembly, and one end of a wheel shaft of the eccentric cam assembly is connected with the swing rod assembly; one end of a swing rod of the swing rod assembly is fixed to a wheel shaft of the eccentric cam assembly, the other end of the swing rod is hinged to a pull rod, and the pull rod is perpendicular to the rotation center line of the eccentric cam assembly. The lifting mechanism solves the problems that a lifting mechanism adopting a plurality of telescopic cylinders is large in control difficulty and high in use cost, is applied to the vertical exchange process of the workbenches of the horizontal turning plate machining center, and ensures that the exchange process of the workbenches is stably and reliably executed.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool workbench moving auxiliary mechanism, in particular to a workbench lifting mechanism suitable for the workbench exchange of a large horizontal flap machining center. Background Art

[0002] Complex aviation structural parts are key core parts of aircraft with characteristics such as large size, high precision, thin walls, low rigidity and large material removal. Since such parts have high requirements in cutting efficiency, cutting heat dissipation and chip removal, large-scale horizontal flap machining centers have gradually been used to replace traditional gantry machining centers for processing.

[0003] The existing large-scale horizontal flap machining center adopts a horizontal spindle layout, and the workpiece is fixed on the worktable. It can be divided into two types: mobile worktable and fixed worktable. Regardless of the layout, the machine tool is equipped with an exchangeable vertical worktable, which is convenient for the discharge of chips and cutting heat during the processing, and improves the processing quality and efficiency of the workpiece. After the processing is completed, the worktable is exchanged to process other parts. At present, the exchange methods of the worktable of the large-scale horizontal flap machining center are mainly vertical exchange and horizontal exchange, and the exchange accuracy of the worktable and the stability during the exchange process are important indicators of the machine tool.

[0004] The existing workbench lifting mechanism generally adopts a telescopic mechanism, such as using a telescopic cylinder to lift or lower the workbench. For example, CN 220613028 U discloses a CNC workbench quick-release exchange tray, which includes a machine tool body, a movable shaft is arranged at the inner bottom of the machine tool body near the rear side, a base is arranged at the inner bottom of the machine tool body near the front side, a fixed seat is arranged near the middle of the inner bottom of the machine tool body, and the upper surfaces of the two positioning seats are provided with a workbench body. The utility model drives the exchange rack to move upward by starting the telescopic rod, so that the workbench body is lifted, and the effect of exchanging the two workbenches is achieved by starting the first motor, so that the workbench body can be quickly disassembled and assembled. However, for a workbench with a large area and a large weight, there are the following problems: 1. It is necessary to use multiple telescopic cylinders to act simultaneously, and good linkage is required, which requires the electrical structure to control multiple telescopic cylinders to work synchronously at the same time, which increases the control difficulty; 2. Since the lifting force of the telescopic cylinder directly acts on the workbench, a telescopic cylinder that can bear a large load matching with it is required for a heavy workbench, and the use cost is high. Utility Model Content

[0005] The purpose of the utility model is to provide a worktable lifting mechanism with a reasonable structure and reliable use, so as to solve the problems of difficulty in controlling and high cost of using a lifting mechanism using multiple telescopic cylinders, and to be applied to the vertical exchange process of the worktable of a horizontal flap machining center to ensure that the worktable exchange process is stably and reliably executed.

[0006] The technical solution of the utility model is:

[0007] A workbench lifting mechanism includes a lifting module, and its technical highlights are: the lifting module includes an eccentric cam assembly and a rocker arm assembly, one end of the wheel axle of the eccentric cam assembly is connected to the rocker arm assembly, one end of the rocker arm of the rocker arm assembly is fixed to the wheel axle of the eccentric cam assembly, and the other end is hinged to the pull rod, the pull rod is perpendicular to the rotation center line of the eccentric cam assembly, and one end of the pull rod is connected to a driving source; the rocker arm assembly includes a rocker arm, the free end of the rocker arm is provided with a first long through hole for the pull rod to pass through, and a second long through hole perpendicular to and connected to the first long through hole, a pin shaft is passed through the pull rod, and both ends of the pin shaft are supported in the second long through hole by bearings.

[0008] The above-mentioned workbench lifting mechanism has a plurality of lifting modules, which are arranged at intervals along the length direction of the pull rod. Each lifting module shares a pull rod, or the pull rods of two adjacent lifting modules are connected in series, and the end of the first pull rod is connected to the driving source.

[0009] The above-mentioned workbench lifting mechanism, the eccentric cam assembly includes an eccentric cam, a wheel axle integrated with the eccentric cam, and a supporting roller assembled on the eccentric cam using bearings, both ends of the wheel axle are supported on the base using bearings, and one end of the wheel axle is led out of the base and connected and fixed to the rocker arm of the rocker arm assembly.

[0010] In the above-mentioned workbench lifting mechanism, the driving source is an oil cylinder, and the telescopic part of the oil cylinder is connected to the end of the pull rod.

[0011] In the above-mentioned workbench lifting mechanism, the fixed end of the swing rod is connected to the wheel shaft key of the eccentric cam and is positioned by a screw.

[0012] In the above-mentioned workbench lifting mechanism, an annular groove matching with the workbench track is provided on the outer peripheral surface of the supporting roller.

[0013] The above-mentioned workbench lifting mechanism has a base provided with a fixing component for connecting with a machine tool.

[0014] The beneficial effects of the utility model are:

[0015] 1. The driving source drives the pull rod to produce linear displacement, and the pull rod drives the swing rod to swing through the pin. Since the swing rod and the wheel axle of the eccentric cam assembly are fixed, the eccentric cam assembly is driven to rotate around its rotation center line, so as to use the eccentric distance generated by the rotation of the eccentric cam to achieve the purpose of lifting the workbench. It is scalable, and multiple lifting modules act synchronously under the linkage of the pull rod, which solves the problem of difficult control of the lifting mechanism using multiple telescopic cylinders. The linkage lifting action is high in precision, ensuring the stable and reliable execution of the workbench exchange process.

[0016] 2. During the lifting process, the utility model utilizes the pulling force generated by the driving source, and finally produces a lever effect through the pull rod and the eccentric cam assembly, thereby amplifying the pulling force generated by the driving source by multiples of the lever ratio, playing a force-enhancing role, significantly improving the load resistance capacity, reducing the use cost, and solving the problem of high use cost of the prior art.

[0017] 3. A bearing is provided between the eccentric cam and the supporting roller, and a bearing is also provided between the pull rod and the pin shaft, that is, rolling friction is used instead of sliding friction to reduce the loss generated during the movement and extend the service life.

[0018] In summary, the utility model can well meet the requirements of the worktable exchange function of the flip machining center, ensure the worktable exchange accuracy, improve the stability of the worktable exchange process, reduce the occurrence of faults, and thus improve the working efficiency of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the lifting module of the utility model;

[0020] Figure 2 It is a usage state diagram of the utility model;

[0021] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0022] Figure 4 It is a schematic diagram of the combined structure of multiple lifting modules of the utility model.

[0023] In the figure: 1. base, 2. pull rod, 3. rocker arm, 4. second long through hole, 5. third bearing, 6. pin, 7. cylinder, 8. connector, 9. machine tool, 10. workbench, 11. first long through hole, 12. fixing assembly, 13. flat key, 14. eccentric cam, 15. support roller, 16. first bearing, 17. second bearing. DETAILED DESCRIPTION

[0024] The utility model is described in detail according to the accompanying drawings of the specification.

[0025] like Figure 1 to Figure 4As shown, the workbench lifting mechanism includes a lifting module, and the lifting module includes an eccentric cam assembly and a rocker assembly. One end of the wheel axle of the eccentric cam assembly is connected to the rocker assembly, one end of the rocker 3 of the rocker assembly is fixed to the wheel axle of the eccentric cam assembly, and the other end is hinged to the pull rod 2, the pull rod 2 is perpendicular to the rotation center line of the eccentric cam assembly, and one end of the pull rod 2 is connected to the driving source.

[0026] In this embodiment, see Figure 4 The number of the lifting modules is 4, which are arranged at intervals along the length direction of the tie rod 2. The tie rods 2 of two adjacent lifting modules are connected in series by a connector 8, and the center lines of each tie rod 2 coincide. The driving source is an oil cylinder 7, and the telescopic part of the oil cylinder 7 is threadedly connected to the end of the first tie rod 2.

[0027] The eccentric cam assembly includes an eccentric cam 14, a wheel shaft integrated with the eccentric cam 14, and a support roller 15 assembled on the eccentric cam 14 by a first bearing 16. The two ends of the wheel shaft are supported on the base 1 by a second bearing 17, and one end of the wheel shaft is led out of the base 1 and connected and fixed to the rocker 3 of the rocker assembly. An annular groove matching the track of the workbench 10 is provided on the outer circumference of the support roller 15, and the cross section of the annular groove is V-shaped. The rocker assembly includes a rocker 3, and the free end of the rocker 3 is provided with a first long through hole 11 for the pull rod 2 to pass through and a second long through hole 4 perpendicular to and connected to the first long through hole 11. The pull rod 2 is penetrated by a pin shaft 6, and the two ends of the pin shaft 6 are supported in the second long through hole 4 by a third bearing 5. The fixed end of the rocker 3 is connected to the wheel shaft of the eccentric cam 14 by a flat key 13, and is positioned by a screw. The base 1 is provided with a fixing assembly 12 for connecting with the machine tool 9.

[0028] Working principle:

[0029] When the workbench 10 needs to be lifted, the oil cylinder 7 is started to drive the pull rod 2 to produce horizontal linear displacement. The pull rod 2 drives the swing rod 3 of each lifting module to swing to a set angle through the pin shaft 6. Since the swing rod 3 is fixed to the wheel axle of the eccentric cam assembly, the eccentric cam assembly is driven to rotate around its rotation center line to a set angle. Then, the support height of the support roller 15 outside the eccentric cam 14 rises, and the circular track of the workbench to be exchanged enters the annular groove of each support roller 15 and is lifted up by each support roller 15. The utility model shows a lever effect during operation. After the original workbench moves the machine tool 9 above each support roller 15, another workbench moves into the machine tool 9. After moving into place, the oil cylinder 7 is reset, and the swing rod 3, eccentric cam 14 and support roller 15 of each lifting module are reset, and the height of the workbench 10 drops to the working height.

[0030] The above embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A workbench lifting mechanism, comprising a lifting module, characterized in that: The lifting module includes an eccentric cam assembly and a rocker arm assembly, one end of the wheel axle of the eccentric cam assembly is connected to the rocker arm assembly, one end of the rocker arm of the rocker arm assembly is fixed to the wheel axle of the eccentric cam assembly, and the other end is hinged to the pull rod, the pull rod is perpendicular to the rotation center line of the eccentric cam assembly, and one end of the pull rod is connected to the driving source; the rocker arm assembly includes a rocker arm, the free end of the rocker arm is provided with a first long through hole for the pull rod to pass through, and a second long through hole perpendicular to and connected to the first long through hole, a pin shaft is passed through the pull rod, and both ends of the pin shaft are supported in the second long through hole by bearings.

2. The workbench lifting mechanism according to claim 1, characterized in that: There are multiple lifting modules, which are arranged at intervals along the length direction of the pull rod. Each lifting module shares a pull rod, or the pull rods of two adjacent lifting modules are connected in series, and the end of the first pull rod is connected to the driving source.

3. The workbench lifting mechanism according to claim 1, characterized in that: The eccentric cam assembly includes an eccentric cam, a wheel axle integrated with the eccentric cam, and a supporting roller assembled on the eccentric cam using bearings. Both ends of the wheel axle are supported on a base using bearings, and one end of the wheel axle is led out of the base and connected and fixed to the rocker arm of the rocker arm assembly.

4. The workbench lifting mechanism according to claim 1, characterized in that: The driving source is an oil cylinder, and the telescopic part of the oil cylinder is connected to the end of the pull rod.

5. The workbench lifting mechanism according to claim 1, characterized in that: The fixed end of the swing rod is connected with the wheel shaft key of the eccentric cam and is positioned by a screw.

6. The workbench lifting mechanism according to claim 3, characterized in that: An annular groove matching with the workbench track is arranged on the outer peripheral surface of the supporting roller.

7. The workbench lifting mechanism according to claim 3, characterized in that: The base is provided with a fixing component for connecting with a machine tool.

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