Four-column lead screw elevator with floatable frame

Abstract

The four-column lead screw elevator comprises four sets of driving assemblies, the same frame mechanism is installed on the four sets of driving assemblies, an elevator frame is arranged among the four frame mechanisms, one side of the elevator frame is fixedly connected with two rectangular frames which are arranged in a non-diagonal mode, and the other side of the elevator frame is fixedly connected with the two rectangular frames which are arranged in a non-diagonal mode. Connecting rods are arranged between the other side of the lifting frame and the other two non-diagonal rectangular frames, the lifting frame is hinged to the rectangular frames through connecting rod mechanisms, and spherical thrust bearings for compensating errors are arranged in the four frame mechanisms; according to the invention, the lifting frame floats in one plane, and the application of the four spherical thrust bearings can enable the lifting frame to float in a second plane, so that the influence of the mounting error and the manufacturing error of the lifting machine on the smooth operation of the lifting machine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of conveying equipment, and in particular to a four-column screw elevator with a floating frame. Background Art

[0002] The drive screw lift is a mechanical transmission device that converts rotational motion into linear motion. It is widely used in various industrial fields, such as automation equipment, lifting equipment, conveying equipment, precision positioning systems, etc.

[0003] Traditional driven screw lifts generally use two driven screws, one driving screw drives the lifting frame on one side. Since the two driving screws are located on both sides to drive the lifting frame, the space between the two driving screws (assuming that the driving screws are distributed on the left and right, then the left and right directions) is occupied by the driving screws and related transmission components (such as motors, couplings, etc. used to drive the driving screws to rotate). Therefore, it is difficult for objects to pass through the direction occupied by the driven screws.

[0004] The load that the screw lift bears for a long time will cause excessive stress on the screw, resulting in bending, tilting and deformation. The existing four-column screw lift frame is basically hard-connected with the columns and guide rails, and cannot be adjusted in time according to changes in the columns. Summary of the invention

[0005] In order to solve the above problem, the present invention provides a four-column screw lift with a floating frame to solve the problem.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A four-column screw elevator with a floating frame includes four groups of drive components. The same frame mechanism is installed on the four groups of drive components. A lifting frame is arranged between the four frame mechanisms. One side of the lifting frame is fixedly connected to two non-diagonally arranged rectangular frames, and the other side is provided with a connecting rod between the other two non-diagonally arranged rectangular frames. The lifting frame is hinged on the rectangular frame through the connecting rod mechanism, and spherical thrust bearings for compensating errors are arranged in the four frame mechanisms.

[0008] The further configuration is as follows: the driving assembly includes a bottom mounting plate, a vertically arranged linear guide rail is fixed on the bottom mounting plate, a top mounting plate is arranged on the upper surface of the linear guide rail, a driving motor is arranged on the top mounting plate, an output end of the driving motor is arranged vertically downward and connected to a vertically arranged driving screw, and the driving screw is rotatably arranged between the top mounting plate and the bottom mounting plate through a bearing, a screw nut is threadedly connected to the circumferential surface of the driving screw, and a frame mechanism is connected to the screw nut and the linear guide rail.

[0009] It is further configured as follows: a frame connecting piece is provided on the lower surface of the top plate, the lead screw nut is placed in the frame mechanism and a plurality of evenly arranged anti-rotation rods are arranged between the lead screw nut and the frame connecting piece.

[0010] It is further configured as follows: the anti-rotation rod is vertically mounted on the lower surface of the frame connector, and the lead screw nut is provided with a plurality of limiting holes for inserting the anti-rotation rod.

[0011] It is further configured as follows: the spherical thrust bearing is engaged between the frame connecting piece and the lead screw nut.

[0012] It is further configured as follows: the spherical thrust bearing comprises an upper shaft ring and a lower seat ring configured in an arc shape.

[0013] It is further configured as follows: a first accommodating groove is opened on the lower surface of the frame connector, an interference fit is formed between the top of the shaft ring and the first groove, and a second groove is opened on the upper surface of the lead screw nut, an interference fit is formed between the bottom of the seat ring and the second groove.

[0014] It is further configured as follows: a detection switch is provided on the frame connector or the lead screw nut, and a controller is also provided, the controller is connected to the detection switch signal and can control the start and stop of the drive motor.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The present invention first adds a spherical thrust bearing at the connection between the driving lead screw and the frame mechanism. The spherical bearing is a circular arc friction pair, which can adjust the angular error generated at both ends of the long lead screw. At the same time, an anti-rotation rod is designed to prevent relative rotation between the frame connector and the lead screw nut. The four driving lead screws of the present invention are simultaneously installed with thrust spherical bearings, so that the thrust spherical bearings can compensate for the angular errors between the four lead screws.

[0017] Furthermore, the lifting frame of the present invention is fixed on one side and hinged to the rectangular frame through a connecting rod on the other side, thereby realizing the follow-up floating of the lifting frame, so that the entire lifting frame can realize follow-up floating in the X direction. Such floating swing can compensate for environmental errors, installation errors and the effects of deformation caused by long-term load-bearing.

[0018] In summary, the lifting frame floats in one plane, and the application of four spherical thrust bearings can make the lifting frame float in the second plane, reducing the impact of the elevator installation error and manufacturing error on the smooth operation of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a front view of the present invention;

[0022] Figure 3 for Figure 2 Schematic diagram of some structures;

[0023] Figure 4 It is a schematic diagram of the interior of the framework mechanism;

[0024] Figure 5 Schematic diagram of the installation position of the spherical thrust bearing.

[0025] Figure numerals: 1. lifting frame; 2. bottom mounting plate; 3. linear guide; 4. top mounting plate; 5. driving motor; 6. driving screw; 7. screw nut; 8. top plate; 10. side plate; 11. frame connector; 12. anti-rotation rod; 13. spherical thrust bearing; 14. shaft ring; 15. seat ring; 16. accommodating slot one; 17. slot two; 18. detection switch; 19. connecting rod. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example

[0030] Reference Figure 1-Figure 5 , a four-column screw lift with a floating frame disclosed in the present invention, comprising four sets of driving components, a same frame mechanism is installed on the four sets of driving components, and a lifting frame 1 is arranged between the four frame mechanisms;

[0031] In this embodiment, the four sets of driving components are rectangular and separated independently, so that the transported parts have passability in both the X direction and the Y direction;

[0032] The driving assembly includes a bottom mounting plate 2, which is mounted on the ground by expansion screws, a vertically arranged linear guide rail 3 is fixed on the bottom mounting plate 2, a top mounting plate 4 is arranged on the upper surface of the linear guide rail 3, a driving motor 5 is arranged on the top mounting plate 4, an output end of the driving motor 5 is arranged vertically downward and connected with a vertically arranged driving lead screw 6, and the driving lead screw 6 is rotatably arranged between the top mounting plate 4 and the bottom mounting plate 2 through a bearing, a lead screw nut 7 is threadedly connected to the circumferential surface of the driving lead screw 6, and the frame mechanism is connected with the lead screw nut 7 and the linear guide rail 3;

[0033] During lifting and transporting, the driving motor 5 drives the driving screw 6 to rotate, and under the rotation drive of the driving screw 6, the screw nut 7 moves up and down, thereby driving the frame mechanism to lift;

[0034] In this embodiment, the frame mechanism includes a rectangular housing composed of a top plate 8 and four side plates 10, wherein the top plate 8 is slidably connected to the linear guide rail 3, and the top plate 8 can move vertically along the linear guide rail 3;

[0035] A frame connector 11 is provided on the lower surface of the top plate 8 by bolts, and the lead screw nut 7 is placed in the frame mechanism and has a plurality of evenly arranged anti-rotation rods 12 between the lead screw nut 7 and the frame connector 11. Specifically, the anti-rotation rod 12 is vertically installed on the lower surface of the frame connector 11, and a plurality of limiting holes for inserting the anti-rotation rod 12 are opened on the lead screw nut 7. The anti-rotation rod 12 is inserted into the limiting hole, thereby limiting the lead screw nut 7 and preventing the lead screw nut 7 from rotating.

[0036] A spherical thrust bearing 13 is installed and engaged between the frame connector 11 and the lead screw nut 7, and the spherical thrust bearing 13 is slidably connected with the drive lead screw 6;

[0037] Further, the spherical thrust bearing 13 includes an upper shaft ring 14 and a lower seat ring 15 which is arranged in an arc shape, wherein a first accommodating groove 16 is provided on the lower surface of the frame connector 11, and an interference fit is formed between the top of the shaft ring 14 and the first groove, and the deviation grade thereof is J8, and a second groove 17 is provided on the upper surface of the lead screw nut 7, and an interference fit is formed between the bottom of the seat ring 15 and the second groove 17, and the deviation grade thereof is J8;

[0038] In this embodiment, the spherical thrust bearing 13 is a circular arc surface friction pair, so that the bearing has the ability to automatically align the center, and can automatically compensate for a certain degree of shaft tilt, thereby compensating for the angle error of the four driving screws 6 caused by the load-bearing tilt;

[0039] A detection switch 18 is provided on the frame connector 11 or the lead screw nut 7. The detection switch 18 is used to detect whether the shaft ring 14 and the seat ring 15 are separated. The present embodiment also provides a controller, and the controller is connected to the detection switch 18 signal and can control the opening and closing of the drive motor 5. When the detection switch 18 detects that the gap between the shaft ring 14 and the seat ring 15 is greater than a preset value, the detection switch 18 transmits a signal to the controller, and the controller controls the drive motor 5 to turn off, thereby stopping the operation of the entire device.

[0040] One side of the lifting frame 1 is fixedly connected to two non-diagonally arranged rectangular frames, and a connecting rod 19 is arranged between the other side and the other two non-diagonally arranged rectangular frames. The lifting frame 1 is hinged on the rectangular frame through the connecting rod 19 mechanism. Specifically, one side of the connecting rod 19 is hinged to the lifting frame 1, and the other side is hinged to the rectangular frame.

[0041] The working principle and beneficial effects of the present invention are:

[0042] The four linear guides 3 of the present invention are equipped with a screw lift. The four linear guides 3 and the four driving screws 6 will have angle deviations due to long-term load-bearing, which is easy to cause over-constraint and cannot run smoothly. The present invention first adds a spherical thrust bearing 13 at the connection between the driving screw 6 and the frame mechanism. The spherical bearing is an arc surface friction pair, which can adjust the angle error generated at both ends of the long screw. At the same time, an anti-rotation rod 12 is designed to prevent relative rotation between the frame connector 11 and the screw nut 7. The four driving screws 6 of the present invention are simultaneously installed with thrust spherical bearings, and the thrust spherical bearings can make up for the angle errors between the four screws.

[0043] Furthermore, the lifting frame 1 of the present invention is fixed on one side and hinged to the rectangular frame on the other side through a connecting rod, thereby realizing the follow-up floating of the lifting frame 1, so that the entire lifting frame 1 can realize follow-up floating in the X direction. Such floating swing can compensate for environmental errors, installation errors and the effects of deformation caused by long-term load-bearing.

[0044] In summary, the lifting frame 1 floats in one plane, and the application of four spherical thrust bearings 13 can make the lifting frame 1 float in a second plane, thereby reducing the influence of the installation error of the elevator and the manufacturing error on the smooth operation of the elevator.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A four-column screw lift with a floating frame, characterized in that: The invention comprises four groups of driving components, on which the same frame mechanism is installed, and a lifting frame (1) is arranged between the four frame mechanisms, one side of the lifting frame (1) is fixedly connected to two rectangular frames arranged non-diagonally, and the other side is hinged to another two rectangular frames arranged non-diagonally, and spherical thrust bearings (13) for compensating errors are arranged in the four frame mechanisms.

2. A four-column screw lift with a floating frame according to claim 1, characterized in that: The driving assembly comprises a bottom mounting plate (2), a vertically arranged linear guide rail (3) is fixed on the bottom mounting plate (2), a top mounting plate (4) is arranged on the upper surface of the linear guide rail (3), a driving motor (5) is arranged on the top mounting plate (4), an output end of the driving motor (5) is arranged vertically downward and connected to a vertically arranged driving lead screw (6), and the driving lead screw (6) is rotatably arranged between the top mounting plate (4) and the bottom mounting plate (2) through a bearing, a lead screw nut (7) is threadedly connected to the circumferential surface of the driving lead screw (6), and a frame mechanism is connected to the lead screw nut (7) and the linear guide rail (3).

3. A four-column screw lift with a floating frame according to claim 2, characterized in that: The frame mechanism comprises a rectangular shell consisting of a top plate (8) and four side plates (10).

4. A four-column screw lift with a floating frame according to claim 3, characterized in that: The top plate (8) is slidably connected to the linear guide rail (3), and the top plate (8) can move vertically along the linear guide rail (3).

5. A four-column screw lift with a floating frame according to claim 4, characterized in that: A frame connecting piece (11) is provided on the lower surface of the top plate (8), and the lead screw nut (7) is placed in the frame mechanism and has a plurality of evenly arranged anti-rotation rods (12) between the lead screw nut and the frame connecting piece (11).

6. A four-column screw lift with a floating frame according to claim 5, characterized in that: The anti-rotation rod (12) is vertically mounted on the lower surface of the frame connecting member (11), and the lead screw nut (7) is provided with a plurality of limiting holes for inserting the anti-rotation rod (12).

7. A four-column screw lift with a floating frame according to claim 4, characterized in that: The spherical thrust bearing (13) is engaged between the frame connecting piece (11) and the lead screw nut (7).

8. A four-column screw lift with a floating frame according to claim 7, characterized in that: The spherical thrust bearing (13) comprises an upper shaft ring (14) and a lower seat ring (15) which is arranged in a circular arc shape.

9. A four-column screw lift with a floating frame according to claim 8, characterized in that: The lower surface of the frame connector (11) is provided with a first accommodating groove (16), an interference fit is formed between the top of the shaft ring (14) and the first accommodating groove, the upper surface of the lead screw nut (7) is provided with a second accommodating groove (17), and an interference fit is formed between the bottom of the seat ring (15) and the second accommodating groove (17).

10. A four-column screw lift with a floating frame according to claim 9, characterized in that: The frame connector (11) or the lead screw nut (7) is provided with a detection switch (18) and a controller, which is connected to the detection switch (18) by signal and can control the start and stop of the drive motor (5).

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