CN116374876B

CN116374876B - Vertical lifting mechanism

Info

Publication number: CN116374876B
Application number: CN202310377994.8A
Authority: CN
Inventors: 邓伟; 董仁泽; 刘行
Original assignee: Hunan Tengzhi Electromechanical Co ltd
Current assignee: Meihu Technology (Changsha) Co., Ltd.
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2025-09-19
Anticipated expiration: 2043-04-11
Also published as: CN116374876A

Abstract

The present invention provides a vertical lifting mechanism, comprising an upper housing, a lower housing, a driving gear, a driven gear, a spline guide rod, an internally splined hollow column, a lifting sleeve, a thrust ball bearing, and a deep groove ball bearing. The driven gear has an internal thread in its shaft hole. The lower end of the internally splined hollow column is bolted to a mounting platform. The lifting sleeve has an axial inner hole with an external thread on its outer circumference. The outer ring of the deep groove ball bearing is mounted on the inner hole wall of the lifting sleeve with a transition fit or a small interference fit. The inner ring of the deep groove ball bearing is sleeved on the outer circumference of the internally splined hollow column with a clearance fit. The lifting sleeve is screwed to the internal thread of the driven gear shaft hole via the external thread. The upper end of the lifting sleeve is mounted with a thrust ball bearing. The spline guide rod is inserted into the internally splined hollow column from top to bottom. The upper end of the spline guide rod is provided with a disc portion, the lower surface of which contacts and cooperates with the thrust ball bearing. The present invention has the advantages of a compact and ingenious structure and precise control.

Description

Vertical lifting mechanism

Technical Field

The invention relates to a lifting mechanism used on an automatic production line, in particular to a vertical lifting mechanism.

Background

In the automatic production line equipment, a laser marking machine is usually used, and in order to improve marking efficiency, a cam divider is usually used for carrying out segmentation operation, and the cam divider on the market generally has only a distance-dividing rotation function and has no lifting function. If a customer wants a production line capable of marking products with different specifications, the whole rack can only be modified, and the modification occupies a large amount of space and the lifting precision is often not as good as expected. The common improvement method is to use a hydraulic or pneumatic structure to lift the cam divider integrally, so that the structure usually uses a plurality of auxiliary structures, cannot accurately lift and position the cam divider, cannot be suitable for products with higher precision, and also adopts a structure of a motor, a gear rack and a motor screw rod, wherein the precision of the structures is high, but the size and the cost of the frame are greatly increased. A cam divider with an integrated lifting mechanism is also currently available on the market, but the lifting stroke is necessarily relatively short because the lifting mechanism is lifted in the form of a cam groove.

Disclosure of Invention

The invention aims to provide a vertical lifting mechanism which is compact in structure and can accurately control lifting travel.

The technical scheme of the invention is that the vertical lifting mechanism consists of a shell part, a transmission part and a lifting part;

The shell part comprises an upper shell and a lower shell, wherein the lower shell is mounted on the mounting table through bolts, and the upper shell is mounted on the contact surface of the lower shell through bolts;

The transmission part comprises a driving gear and a driven gear which are meshed with each other, the driving gear can be arranged on an output shaft of the motor or the speed reducer, the driven gear is positioned in a cavity formed between the upper shell and the lower shell, and an internal thread is arranged in a shaft hole of the driven gear;

The lifting part comprises a spline guide rod, an internal spline hollow column, a lifting sleeve, a thrust ball bearing and a deep groove ball bearing, wherein the lower end of the internal spline hollow column is arranged on an installation table through a bolt, the lifting sleeve is provided with an axial inner hole, the periphery of the lifting sleeve is provided with external threads, an outer ring of the deep groove ball bearing is arranged on the inner hole wall of the lifting sleeve in a transition fit or small interference fit mode, an inner ring of the deep groove ball bearing is sleeved on the outer peripheral surface of the internal spline hollow column in a clearance fit mode, the lifting sleeve is connected with the internal threads of a driven gear shaft hole in a screwing mode through the external threads, an annular groove is formed in the upper end of the lifting sleeve and is used for installing the thrust ball bearing, the spline guide rod is inserted into the internal spline hollow column from top to bottom, the upper end of the spline guide rod is provided with a disc part, and the lower surface of the disc part is in contact fit with the thrust ball bearing.

Further, the device further comprises a workpiece clamp which is arranged on the upper surface of the disc part through bolts and is used for installing a product to be processed.

Further, a supporting copper ring is arranged in the grooves in the upper shell and the lower shell and used for supporting and limiting the driven gear.

In one embodiment, the number of deep groove ball bearings is two.

In one embodiment, the upper and lower housings form a gap corresponding to the meshing position of the driving gear and the driven gear.

The working principle and the working process of the lifting mechanism are as follows:

When the driving gear drives the driven gear to rotate, the driven gear transmits the rotating force to the lifting sleeve without the limitation of the axial freedom degree through the internal thread, so that the lifting sleeve performs rotating motion and lifting motion in the shaft hole of the driven gear through the external thread. The lifting sleeve is provided with a rotating force while lifting, and the rotating force can be prevented from being continuously transmitted by arranging the deep groove ball bearing and the thrust ball bearing, because the inner ring of the deep groove ball bearing is in clearance fit with the outer peripheral surface of the hollow column with the internal spline, the thrust ball bearing is in contact fit with the lower surface of the disc part, and the internal spline of the hollow column with the internal spline completely limits the rotation of the spline guide rod, so that the rotating force of the lifting sleeve is not transmitted to the hollow column with the internal spline inwards, and is not transmitted to the disc part of the spline guide rod upwards. When the lifting sleeve descends, the spline guide rod and the disc part of the spline guide rod can follow the lifting sleeve to descend under the action of self gravity, so that the spline guide rod and the disc part of the spline guide rod can vertically ascend and descend relative to the mounting table, and products of different specifications and even different types can be mounted on the upper surface of the disc part by means of the workpiece clamp according to requirements.

The vertical lifting mechanism provided by the invention has the advantages of compact and ingenious structure, capability of accurately controlling lifting travel, capability of vertically lifting, wide application range and the like, and can be suitable for products with different specifications and different types of products by replacing the clamp.

Drawings

FIG. 1 is a schematic cross-sectional view of a lifting mechanism in an embodiment of the invention;

FIG. 2 is a schematic view of an external structure of a lifting mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the installation structure of a driving gear, a driven gear and a lifting sleeve according to the embodiment of the invention;

FIG. 4 is a schematic diagram of an exploded view of a lifting mechanism according to an embodiment of the present invention;

The reference numerals are:

1-product 2-workpiece holder

3-Spline guide rod 4-thrust ball bearing

5-Snap spring 6-upper shell for hole

7-Driving gear 8-driven gear

9-Support copper ring 10-lifting sleeve

11-Lower shell 12-deep groove ball bearing

13-Internal spline hollow column 14-mounting table.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in figures 1 to 4, the preferred embodiment of the invention is a vertical lifting mechanism which comprises a spline guide rod 3, a thrust ball bearing 4, a driving gear 7, a driven gear 8, a lifting sleeve 10, a deep groove ball bearing 12, an inner spline hollow column 13, an upper shell 6 and a lower shell 11, wherein the lower shell 11 is arranged on a mounting table 14 through bolts, the upper shell 6 is arranged on the contact surface of the lower shell 11 through bolts, the driving gear 7 can be arranged on an output shaft of a motor or a speed reducer, the driven gear 8 is positioned in a cavity formed between the upper shell and the lower shell, an inner thread is arranged in a shaft hole of the driven gear 8, the lower end of the inner spline hollow column 13 is arranged on the mounting table 14 through bolts, the lifting sleeve 10 is provided with an axial inner hole, the outer circumference of the lifting sleeve is provided with an outer thread, the outer ring of the deep groove ball bearing 12 is sleeved on the outer circumferential surface of the inner spline hollow column 13 in a clearance fit manner, the lifting sleeve 10 is in rotary connection with the inner thread of the shaft hole of the driven gear 8 through the outer thread, the upper end of the lifting sleeve 10 is provided with an annular groove 4 for mounting the thrust ball bearing 3, the lower end of the thrust ball bearing 3 is arranged in contact with the disc 3 from the upper end of the thrust ball bearing and the lower end of the thrust ball bearing is in contact with the disc 3.

As shown in fig. 1,2 and 4, the present embodiment further includes a workpiece holder 2, the workpiece holder 2 is mounted on the upper surface of the disc portion by bolts, the workpiece holder 2 is used for mounting a product 1 to be processed, and the product 1 in the present embodiment is a pump body.

As shown in fig. 1 to 4, the number of the deep groove ball bearings 12 in the embodiment is two, a hole is respectively arranged at the outer side ends of the two deep groove ball bearings 12 for limiting, a notch is formed at the position of the upper shell and the lower shell corresponding to the meshing position of the driving gear and the driven gear, and a supporting copper ring 9 is further arranged in the grooves in the upper shell and the lower shell for supporting and limiting the driven gear 8.

When the driving gear 7 drives the driven gear 8 to rotate, the driven gear 8 transmits the rotation force to the lifting sleeve 10 without the limitation of the axial freedom degree through the internal thread, so that the lifting sleeve 10 performs the rotation motion and the lifting motion in the shaft hole of the driven gear 8 through the external thread. Because the lifting sleeve 10 has rotating force while lifting, the continuous transmission of the rotating force can be avoided by arranging the deep groove ball bearing 12 and the thrust ball bearing 4, because the inner ring of the deep groove ball bearing 12 is in clearance fit with the outer peripheral surface of the internal spline hollow column 13, the thrust ball bearing 4 is in contact fit with the lower surface of the disc part, and the internal spline of the internal spline hollow column 13 completely limits the rotation of the spline guide rod 3, so that the rotating force of the lifting sleeve 10 is not transmitted inwards to the internal spline hollow column 13 and is not transmitted upwards to the disc part of the spline guide rod 3. Therefore, when the lifting sleeve 10 is lifted, the deep groove ball bearing 12 is driven to slide upwards while rotating along the outer peripheral surface of the hollow inner spline column 13, the disc part of the spline guide rod is jacked up to move upwards through the thrust ball bearing 4, the spline guide rod 3 and the disc part of the spline guide rod are not driven to rotate, when the lifting sleeve 10 is lifted, the spline guide rod 3 and the disc part of the spline guide rod follow the lifting sleeve 10 to be lifted down under the action of self gravity, so that the spline guide rod 3 and the disc part of the spline guide rod vertically lift relative to the mounting table 14, and products 1 with different specifications and even different types can be mounted on the upper surface of the disc part by means of the workpiece clamp 2 according to requirements.

The above embodiment is a preferred implementation of the present invention, but in addition, the present invention may be implemented in other ways, and any obvious substitution is within the scope of the present invention without departing from the concept of the present technical solution.

In order to facilitate understanding of the improvements of the present application over the prior art, some of the figures and descriptions of the present application have been simplified and some other elements have been omitted for clarity, as will be appreciated by those of ordinary skill in the art.

Claims

1. A vertical lifting mechanism, characterized in that: the lifting mechanism consists of a housing part, a transmission part, and a lifting part;

The housing portion comprises an upper housing (6) and a lower housing (11), wherein the lower housing (11) is mounted on a mounting platform (14) by means of bolts, and the upper housing (6) is mounted on a contact surface of the lower housing (11) by means of bolts;

The transmission part includes a driving gear (7) and a driven gear (8) that mesh with each other. The driving gear (7) can be installed on the output shaft of the motor or the reducer. The driven gear (8) is located in a cavity formed between the upper and lower shells. An internal thread is provided in the shaft hole of the driven gear (8);

The lifting part includes a spline guide rod (3), an inner spline hollow column (13), a lifting sleeve (10), a thrust ball bearing (4) and a deep groove ball bearing (12), wherein the lower end of the inner spline hollow column (13) is mounted on a mounting platform (14) by means of bolts, and the lifting sleeve (10) has an axial inner hole and an outer thread is provided on its outer periphery; the outer ring of the deep groove ball bearing (12) is mounted on the inner hole wall of the lifting sleeve (10) in a transition fit or a small interference fit manner, and the deep groove ball bearing (12) The inner ring is sleeved on the outer peripheral surface of the inner spline hollow column (13) in a clearance fit manner; the lifting sleeve (10) is screwed to the inner thread of the shaft hole of the driven gear (8) through the outer thread, and the upper end of the lifting sleeve (10) is provided with an annular groove for installing the thrust ball bearing (4), and the spline guide rod (3) is inserted into the inner spline hollow column (13) from top to bottom. The upper end of the spline guide rod (3) is provided with a disc portion, and the lower surface of the disc portion is in contact with the thrust ball bearing (4).

2. The vertical lifting mechanism according to claim 1 is characterized in that it also includes a workpiece clamp (2), which is installed on the upper surface of the disc part by bolts, and the workpiece clamp (2) is used to install the product (1) to be processed.

3. The vertical lifting mechanism according to claim 1 or 2, characterized in that a supporting copper ring (9) is further provided in the groove inside the upper and lower shells to provide support and limit the driven gear (8).

4. The vertical lifting mechanism according to claim 1 or 2, characterized in that the number of the deep groove ball bearings (12) is two.

5. The vertical lifting mechanism according to claim 1 or 2, characterized in that a notch is formed in the upper and lower shells corresponding to the position where the driving and driven gears are engaged.