A vertical lifting mechanism

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 together with 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

Technical Field

[0001] The invention relates to a lifting mechanism used in an automated production line, in particular to a vertical lifting mechanism. Background Art

[0002] Laser marking machines are commonly used in automated production line equipment. To improve marking efficiency, cam dividers are often used for segmented operations. However, commercially available cam dividers generally only have a rotating function for segmentation, without a lifting function. If a customer desires a production line that can mark products of varying specifications, the entire machine frame must be modified. This modification not only takes up a large amount of space but also often results in lower-than-expected lifting accuracy. Common improvements include using hydraulic or pneumatic mechanisms to lift the cam divider as a whole. However, such structures often require numerous auxiliary structures and lack precise lifting and positioning, making them unsuitable for high-precision products. Other approaches utilize a motor, rack, and pinion, along with a motor lead screw. While these structures offer high precision, they significantly increase the size and cost of the machine frame. Currently, there are also integrated lifting cam dividers available on the market. However, because their internal lifting mechanism utilizes a cam groove for lifting, their lifting stroke is inherently short. Summary of the Invention

[0003] The object of the present invention is to provide a vertical lifting mechanism with a compact structure and capable of precisely controlling the lifting stroke.

[0004] The technical solution of the present invention is: a vertical lifting mechanism, consisting of a shell part, a transmission part, and a lifting part;

[0005] The housing portion comprises an upper housing and a lower housing, wherein the lower housing is mounted on the mounting platform by bolts, and the upper housing is mounted on the contact surface of the lower housing by bolts;

[0006] The transmission part includes a driving gear and a driven gear that mesh with each other. The driving gear can be installed on the output shaft of the motor or the reducer. The driven gear is located in the cavity formed between the upper and lower shells. The shaft hole of the driven gear is provided with an internal thread.

[0007] The lifting part includes a spline guide rod, an inner spline hollow column, a lifting sleeve, a thrust ball bearing and a deep groove ball bearing. The lower end of the inner spline hollow column is mounted on the mounting platform by bolts. The lifting sleeve has an axial inner hole and an outer thread is provided on its outer periphery. 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, and the inner ring of the deep groove ball bearing is sleeved on the outer peripheral surface of the inner spline hollow column with a clearance fit. The lifting sleeve is screwed together with the inner thread of the driven gear shaft hole through the external thread. The upper end of the lifting sleeve is provided with an annular groove for installing the thrust ball bearing. The spline guide rod is inserted into the inner spline hollow column from top to bottom. The upper end of the spline guide rod is provided with a disc portion, and the lower surface of the disc portion is in contact with the thrust ball bearing.

[0008] Furthermore, it also includes a workpiece clamp, which is installed on the upper surface of the disc part through bolts, and is used to install the product to be processed.

[0009] Furthermore, supporting copper rings are provided in the grooves inside the upper and lower shells to provide support and limit the driven gear.

[0010] In one embodiment, the number of the deep groove ball bearings is two.

[0011] In one embodiment, a notch is formed on the upper and lower housings corresponding to the position where the driving gear and the driven gear are engaged.

[0012] The working principle and process of the above lifting mechanism are:

[0013] When the driving gear drives the driven gear to rotate, the driven gear transmits the rotational force to the lifting sleeve, which has no axial freedom restriction, through the internal thread. This causes the lifting sleeve to rotate and lift within the axial hole of the driven gear via the external thread. Since the lifting sleeve generates rotational force while lifting, the provision of deep groove ball bearings and thrust ball bearings prevents further transmission of this rotational force. This is because the inner ring of the deep groove ball bearing has a clearance fit with the outer circumference of the internal spline hollow column, while the thrust ball bearing has a contact fit with the lower surface of the disc. Furthermore, the internal splines of the internal spline hollow column completely restrict the rotation of the spline guide rod. As a result, the rotational force of the lifting sleeve is neither transmitted inward to the internal spline hollow column nor transmitted upward to the disc of the spline guide rod. Therefore, when the lifting sleeve rises, it will drive the deep groove ball bearing to rotate and slide upward along the outer circumference of the inner spline hollow column, and lift the spline guide rod disc part upward through the thrust ball bearing, without driving the spline guide rod and its disc part to rotate; when the lifting sleeve descends, the spline guide rod and its disc part will follow the lifting sleeve to descend under the action of their own gravity, so that the spline guide rod and its disc part can be vertically lifted and lowered relative to the mounting table, so that products of different specifications or even different types can be installed on the upper surface of the disc part with the help of workpiece clamps according to needs.

[0014] The vertical lifting mechanism provided by the present invention has the advantages of compact and ingenious structure, precise control of lifting stroke, vertical lifting, and wide range of applications. It is not only applicable to products of different specifications, but also applicable to different types of products by replacing the clamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a transverse cross-sectional structure of a lifting mechanism in an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of the external structure of the lifting mechanism in an embodiment of the present invention;

[0017] Figure 3 Schematic diagram of the installation structure of the driving gear, the driven gear, and the lifting sleeve in an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of the explosion structure of the lifting mechanism in an embodiment of the present invention;

[0019] The accompanying drawings are:

[0020] 1——Product 2——Workpiece fixture

[0021] 3——Spline guide rod 4——Thrust ball bearing

[0022] 5——Hole retaining ring 6——Upper shell

[0023] 7——driving gear 8——driven gear

[0024] 9——Support copper ring 10——Lifting sleeve

[0025] 11——lower housing 12——deep groove ball bearing

[0026] 13——Inner spline hollow column 14——Mounting table. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to 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 limiting the present invention.

[0029] like Figures 1 to 4 As shown, the preferred embodiment of the present invention is: a vertical lifting mechanism, including 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 internal spline hollow column 13, an upper shell 6 and a lower shell 11; the lower shell 11 is mounted on the mounting platform 14 by bolts, and the upper shell 6 is mounted on the contact surface of the lower shell 11 by bolts; the driving gear 7 can be mounted on the output shaft of the motor or the reducer, and the driven gear 8 is located in the cavity formed between the upper and lower shells, and the shaft hole of the driven gear 8 is provided with an internal thread; the lower end of the internal spline hollow column 13 is mounted on the mounting platform 14 by bolts On; the lifting sleeve 10 has an axial inner hole, and its outer circumference is provided with an external thread; the outer ring of the deep groove ball bearing 12 is installed on the inner hole wall of the lifting sleeve 10 with a transition fit or a small interference fit, and the inner ring of the deep groove ball bearing 12 is sleeved on the outer circumference of the inner spline hollow column 13 with a clearance fit; the lifting sleeve 10 is screwed with the internal thread of the shaft hole of the driven gear 8 through the external 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.

[0030] like Figure 1 、 2 As shown in Figures 4 and 5, this embodiment further includes a workpiece fixture 2, which is mounted on the upper surface of the disc portion by bolts. The workpiece fixture 2 is used to mount the product 1 to be processed. In this embodiment, the product 1 is a pump body.

[0031] like Figures 1 to 4 As shown, the number of deep groove ball bearings 12 in this embodiment is two, and a hole is installed on the outer end of each of the two deep groove ball bearings 12 for limiting. A notch is formed in the upper and lower shells corresponding to the position where the master and driven gears are engaged, and a supporting copper ring 9 is also provided in the groove inside the upper and lower shells to provide support and limiting for the driven gear 8.

[0032] The working principle and process of the above lifting mechanism are:

[0033] When the driving gear 7 drives the driven gear 8 to rotate, the driven gear 8 transmits the rotational force to the lifting sleeve 10, which has no axial freedom restriction, through the internal thread, causing the lifting sleeve 10 to rotate and lift within the axial hole of the driven gear 8 via the external thread. Since the lifting sleeve 10 generates rotational force while being raised and lowered, the provision of the deep groove ball bearing 12 and the thrust ball bearing 4 prevents further transmission of the rotational force. This is because the inner ring of the deep groove ball bearing 12 has a clearance fit with the outer circumference of the internal spline hollow column 13, and the thrust ball bearing 4 has a contact fit with the lower surface of the disc portion. In addition, the internal splines of the internal spline hollow column 13 completely restrict the rotation of the spline guide rod 3. As a result, the rotational force of the lifting sleeve 10 is neither transmitted inwardly to the internal spline hollow column 13 nor transmitted upwardly to the disc portion of the spline guide rod 3. Therefore, when the lifting sleeve 10 rises, it will drive the deep groove ball bearing 12 to rotate and slide upward along the outer circumference of the inner spline hollow column 13, and lift the spline guide rod disc part upward through the thrust ball bearing 4, without driving the spline guide rod 3 and its disc part to rotate; when the lifting sleeve 10 descends, the spline guide rod 3 and its disc part will follow the lifting sleeve 10 to descend under the action of its own gravity, so that the spline guide rod 3 and its disc part can be vertically lifted relative to the mounting table 14, so that products 1 of different specifications or even different types can be mounted on the upper surface of the disc part with the help of the workpiece clamp 2 as needed.

[0034] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of the patent of the present invention.

[0035] In order to make it easier for those skilled in the art to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have been omitted in this application document. Those skilled in the art should realize that these omitted elements may also constitute the content of the present invention.

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, characterized in that: It also includes a workpiece fixture (2), which is mounted on the upper surface of the disc portion via bolts, and is used to mount 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 also provided in the grooves inside the upper and lower shells for providing support and limiting 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 between the upper and lower shells at positions corresponding to the meshing positions of the driving and driven gears.

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