Long-stroke lead screw transmission device

Abstract

The utility model relates to the technical field of lead screw supporting devices of mechanical equipment, in particular to a long-stroke lead screw transmission device which comprises a horizontally-arranged rack and a combination of a servo motor and a lead screw, the servo motor and the lead screw are installed on the rack, and the output end of the lead screw drives a push plate to move transversely. The device further comprises at least one dragging roller shaft mechanism. The dragging roll shaft mechanism comprises a lifting module, a connecting part and a lifting module. The lifting module is fixedly mounted on the rack below the screw rod; one end of the connecting part is fixedly connected with the output end of the lifting module, the other end of the connecting part is fixedly connected with the lifting module, and the lifting module drives the lifting module to move in the plumb bob direction and is used for supporting the lead screw and automatically avoiding a push plate of the lead screw in the advancing process of the push plate on the lead screw. The dragging roll shaft mechanism plays a role in supporting and lifting the screw rod, effectively prevents the middle part of the screw rod shaft from drooping and bending, can avoid a push plate on the screw rod, reduces the abrasion of the screw rod, improves the operation stability of the transmission device, prolongs the service life of the transmission device, and maintains the transmission precision of the transmission device.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rod support devices for mechanical equipment, in particular to a long-stroke screw rod transmission device. Background Art

[0002] A lead screw is an ideal device for converting rotary motion into linear motion, or vice versa. A common lead screw on the market is a device that converts rotary motion into linear motion. Lead screws are widely used in existing machine tools. The lead screw is supported at both ends by bearings and bearing seats. The lead screw is driven by a motor to rotate. A nut is fitted onto the threaded portion of the lead screw. The nut has threads or balls that match the lead screw threads. The nut is connected to the machine tool's moving parts via a nut seat. When the drive motor rotates the lead screw, the lead screw threads drive the nut along the lead screw axis, and the machine tool's moving parts, connected to the nut, follow the movement.

[0003] The moving parts of large machine tools often have large travels. The lead screw nut reciprocates laterally across the long lead screw, making it impossible to install a support bearing in the middle of the long lead screw. Due to the long lead screw travel, the lead screw often sags severely in the middle due to its own weight, or sags and bends severely due to the combined weight of the lead screw and the weight of the machine tool's moving parts. This can cause jitter during transmission, affecting the lead screw's transmission accuracy and service life. Therefore, some factories increase the lead screw diameter or install elastic support devices to improve lead screw jitter and ensure accuracy. However, for large push-plate furnaces, roller furnaces, and other heavy-duty mass-produced industrial furnaces, the products to be transported are very heavy, and the precision requirements for each push plate advance are very high. Therefore, an ultra-long-travel lead screw or ball screw must be used for transmission. The lead screw travel can typically reach 4 meters or more, and the lead screw must be installed horizontally. In this case, even if the diameter of the extra-long lead screw shaft is increased, the lead screw shaft will still sag and bend, resulting in eccentric force, which can easily cause the push plate on the lead screw to crawl and shake when advancing. It will also cause unilateral force on the linear bearings, guide shafts, etc. on the lead screw, aggravating the wear of the lead screw and significantly reducing the operating stability and life of the equipment. In addition, increasing the diameter of the extra-long lead screw shaft will increase the lead screw material and processing costs, and at the same time, increase the weight of the entire equipment, which is not conducive to the long-term development of the enterprise. Although the installation of an elastic support device under the lead screw can alleviate the phenomenon of lead screw shaft sagging and bending to a certain extent, when the push plate passes the position where the lead screw and the elastic support device meet, there is a large mutual friction between the push plate and the elastic support device, which will cause the push plate to have a reduced accuracy during the advancement process, thereby affecting the transmission accuracy of the lead screw.

[0004] The present utility model provides a long-stroke lead screw drive device to solve the problems existing in the prior art, such as the lead screw shaft sagging and bending, resulting in the push plate on the lead screw creeping and jittering during forward movement, increased wear of the lead screw, and decreased transmission accuracy. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a long-stroke lead screw drive device to solve the problems existing in the prior art, such as the lead screw shaft sagging and bending, resulting in the push plate on the lead screw creeping and jittering during forward movement, increased wear of the lead screw, and decreased transmission accuracy.

[0006] The technical solution of the present utility model is: a long-stroke lead screw drive device, including: a horizontally arranged frame, a combination of a servo motor and a lead screw installed on the frame, and the output end of the lead screw drives a push plate to move laterally; wherein, it further includes at least one idler shaft mechanism.

[0007] The idler shaft mechanism includes a lifting module, a connecting component, and a lifting module; the lifting module is fixedly installed on the frame below the lead screw; one end of the connecting component is fixedly connected to the output end of the lifting module, and the other end is fixedly connected to the lifting module. The lifting module drives the lifting module to move longitudinally, for supporting the lead screw and automatically avoiding the push plate during the forward movement of the push plate on the lead screw.

[0008] Preferably, a travel switch is provided at the upper end of the frame and near the starting end of the lead screw, for detecting the position of the push plate and automatically controlling the lifting of the lifting module.

[0009] Preferably, the lifting module is any one of a cylinder, an electric cylinder, and a pulley block.

[0010] Preferably, the connecting component includes a connecting plate and a connecting shaft; the connecting plate is fixedly connected to the output end of the lifting module; the connecting shaft is fixedly arranged at the upper end of the connecting plate.

[0011] Preferably, the lifting module includes a lifting connecting plate, a lifting frame, and a plurality of lifting components; the lifting connecting plate is fixedly arranged at the upper end of the connecting shaft; the lifting frame is arranged on the lifting connecting plate; the lifting components are arranged on the lifting frame.

[0012] Preferably, the lifting component is set as a lifting roller group; the lifting roller group includes two rollers, and the axes of the two rollers are arranged in parallel.

[0013] Preferably, the lifting component is set as a lifting plate; a groove is provided on the lifting plate for accommodating and supporting the lead screw.

[0014] Compared with the prior art, the advantages of the present utility model are:

[0015] (1) The present utility model provides a long-stroke lead screw transmission device, which includes a roller shaft mechanism arranged below the lead screw; the structure of the roller shaft mechanism is simple and firm, and it runs reliably; moreover, the roller shaft mechanism can not only support and lift the lead screw, effectively preventing the middle part of the lead screw shaft from sagging and bending due to its own weight and / or the gravity of the conveyed object, greatly reducing the wear of the lead screw, thereby improving the running stability and service life of the transmission device; it can also automatically avoid the output end and the push plate of the lead screw when driving the push plate to move horizontally at the output end of the lead screw, enabling the push plate to move forward stably while maintaining a high transmission accuracy; solving the problems existing in the prior art such as the sagging and bending of the lead screw shaft, resulting in the creep and jitter of the push plate on the lead screw during forward movement, increased wear of the lead screw, and decreased transmission accuracy.

[0016] (2) A long-stroke lead screw transmission device provided by the present utility model includes a travel switch arranged on the frame, which can be used to monitor the positions of the output end and the push plate on the lead screw in real time, and the detection signal of the travel switch is linked with the control valve of the lifting module to control, realizing the automatic adjustment of the lifting of the lifting module through the detection signal of the travel switch, achieving the effect of flexibly adjusting the action position of the lifting module, and further realizing the effect of the roller shaft mechanism automatically avoiding the output end and the push plate on the lead screw, improving the transmission accuracy of the transmission device.

[0017] (3) A long-stroke lead screw transmission device provided by the present utility model can flexibly set the number and positions of the roller shaft mechanisms according to different lead screw strokes, without being restricted by the length and stroke of the lead screw, so as to achieve the best support effect and make the lead screw run smoothly. Brief Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0019] Figure 1 is a schematic structural diagram of the long-stroke lead screw transmission device provided by the present utility model;

[0020] Figure 2 is a left view of the long-stroke lead screw transmission device provided by the present utility model;

[0021] Figure 3 is a schematic structural diagram of the roller shaft mechanism of the present utility model in the working position and the original position;

[0022] Figure 4 is a right view of the roller shaft mechanism provided by the present utility model;

[0023] Figure 5 is a top view of the roller shaft mechanism provided by the present utility model;

[0024] Figure 6The front view of the idler shaft mechanism provided by the present utility model;

[0025] Wherein: 1. Frame; 2. Electric cylinder; 21. Servo motor; 22. Lead screw; 23. Guide rod; 3. Idler shaft mechanism; 4. Lifting module; 5. Connecting component; 51. Connecting plate; 52. Connecting shaft; 6. Lifting module; 61. Lifting connecting plate; 62. Lifting frame; 63. Lifting component; 64. Lifting roller group; 65. Roller; 66. Lifting plate; 67. Groove; 7. Travel switch. Detailed implementation manners

[0026] The following combines specific embodiments to further elaborate on the content of the present utility model:

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present utility model and simplifying the description, rather than indicating or implying that the components referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0028] A long-stroke lead screw transmission device includes a horizontally arranged frame 1 and an electric cylinder 2 installed on the frame 1. As Figure 1 shown, wherein, the electric cylinder 2 is a combination of a servo motor 21 and a lead screw 22; the lead screw 22 is arranged at the upper end of the frame 1 and is parallel to the frame 1, the servo motor 21 is fixedly installed on the side of the frame 1 and on the side of the frame 1 close to the starting end of the lead screw 22; the servo motor 21 drives the lead screw 22 to rotate through a sprocket and a chain; the output end of the lead screw 22 drives the push plate to move horizontally. The transmission device further includes at least one idler shaft mechanism 3; the idler shaft mechanism 3 is fixedly arranged on the frame below the lead screw 22, and the idler shaft mechanism 3 can move up and down in a direction perpendicular to the lead screw 22 for supporting the lead screw 22.

[0029] The idler shaft mechanism 3 includes a lifting module 4, a connecting component 5 and a lifting module 6; the lifting module 4 can be fixedly installed on the frame 1 below the lead screw 22 by means of bolt connection, screw connection, welding, etc.; one end of the connecting component 5 is fixedly connected to the output end of the lifting module 4, and the other end is fixedly connected to the lifting module 6. The lifting module 4 drives the lifting module 6 to move longitudinally, that is, the lifting module 4 drives the lifting module 6 to move in the plumb direction, for supporting and lifting the lead screw 22, and automatically avoiding its output end and the push plate during the process of the output end of the long-stroke lead screw 22 driving the push plate to travel.

[0030] A travel switch 7 is arranged at the upper end of the frame 1 and at a position close to the starting end of the lead screw 22, as Figure 2As shown, it is used to monitor the positions of the output end on the lead screw 22 and the push plate in real time, and the detection signal of the travel switch 7 is linked with the control valve of the lifting module 4 to realize the automatic regulation of whether the lifting module 4 lifts or not. As Figure 3 As shown, before the output end of the lead screw 22 drives the push plate to move horizontally, the lifting module 4 drives the lifting module 6 to rise, so that the lifting module 6 acts on the lead screw 22 to support and lift the lead screw 22. At this time, the lifting module 6 is in the working position; when the output end of the lead screw 22 drives the push plate to move forward, the travel switch 7 will monitor the position of the push plate in real time and transmit its detection signal to the control system. When the output end of the lead screw 22 drives the push plate to be about to move forward directly above the lifting module 6, that is, at the position where the lifting module 6 and the lead screw 22 are in contact with each other, the control system will automatically open the control valve of the lifting module 4, so that the lifting module 4 drives the lifting module 6 to move downward, and then the lifting module 6 automatically avoids the output end on the lead screw 22 and the push plate. At this time, the lifting module 6 descends to its original position; when the output end of the lead screw 22 drives the push plate to pass directly above the lifting module 6, the lifting module 4 drives the lifting module 6 to move upward, so that the lifting module 6 returns to the working position and continues to play its role of support and lifting.

[0031] The lifting module 4 in the idler shaft mechanism 3 can be a combination of a cylinder, an electric cylinder, a motor and a rack and pinion, or any other module that can realize lifting movement. The connecting component 5 in the idler shaft mechanism 3 includes a connecting plate 51 and a connecting shaft 52; the connecting plate 51 is fixedly connected to the output end of the lifting module 4; the lower end of the connecting shaft 52 is fixedly arranged on the upper end of the connecting plate 51. The lifting module 6 in the idler shaft mechanism 3 includes a lifting connecting plate 61, a lifting frame 62 and three lifting components 63; the lifting connecting plate 61 is fixedly arranged on the upper end of the connecting shaft 52; the bottom of the lifting frame 62 is fixedly arranged on the lifting connecting plate 61; the upper end of the lifting frame 62 is set to be convex, forming three platforms with a middle-high and two-side-low shape; the lifting components 63 are arranged on the upper end of the lifting frame 62; and the three lifting components 63 are sequentially arranged on the three platforms; thus, the lifting component 63 arranged on the middle platform is used to support the lead screw 22, and the lifting components 63 arranged on the two-side platforms are used to support the guide rod 23. In other embodiments, the shape of the upper end of the lifting frame 62 should fit the positional relationship between the guide rod 23 and the lead screw 22; for example, when the guide rod 23 and the lead screw 22 are at the same height, the upper end of the lifting frame 62 can be set as a flat structure. In addition, in other embodiments, there may be only one or more guide rods 23. At this time, the number of the lifting components 63 arranged at the upper end of the lifting frame 62 can be determined according to the number of the guide rod 23 and the lead screw 22; or only one lifting component 63 can be arranged and used to support the lead screw 22.

[0032] In this embodiment, as Figure 4, Figure 5 As shown, the lifting member 63 is provided as a lifting roller set 64; the lifting roller set 64 includes two rollers 65, and the axes of the two rollers 65 are arranged in parallel. At the same time, for the lifting roller set 64 that supports the lead screw 22, the distance between the two rollers 65 is less than the diameter of the lead screw 22; for the lifting roller set 64 that supports the guide rod 23, the distance between the two rollers 65 is less than the diameter of the guide rod 23. In other embodiments, the lifting member 63 can be provided as a lifting plate 66, as Figure 6 shown, a groove 67 is provided on the lifting plate 66, and the groove 67 is used to accommodate and support the lead screw 22 or the guide rod 23. The shape of the groove 67 can be any one of a V shape, an arc shape, a trapezoid shape, etc. that can achieve the purpose of limiting and supporting.

[0033] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A long-stroke screw drive device, comprising: A horizontally arranged frame (1), a combination of a servo motor (21) and a lead screw (22) installed on the frame (1), and the output end of the lead screw (22) drives a push plate to move laterally; characterized in that it further comprises at least one roller shaft mechanism (3); The roller shaft mechanism (3) includes a lifting module (4), a connecting component (5) and a lifting module (6); the lifting module (4) is fixedly installed on the frame (1) below the lead screw (22); one end of the connecting component (5) is fixedly connected to the output end of the lifting module (4), and the other end is fixedly connected to the lifting module (6), and the lifting module (4) drives the lifting module (6) to move longitudinally, for supporting the lead screw (22) and automatically avoiding the push plate during the movement of the push plate on the lead screw (22).

2. The long-stroke screw drive device according to claim 1, characterized in that: A travel switch (7) is provided at the upper end of the frame (1) and near the starting end of the lead screw (22), for detecting the position of the push plate and automatically controlling the lifting of the lifting module (4).

3. A long-stroke screw drive device according to claim 2, characterized in that: The connecting component (5) includes a connecting plate (51) and a connecting shaft (52); the connecting plate (51) is fixedly connected to the output end of the lifting module (4); the connecting shaft (52) is fixedly arranged at the upper end of the connecting plate (51).

4. A long-stroke screw drive device according to claim 3, characterized in that: The lifting module (6) includes a lifting connecting plate (61), a lifting frame (62), and a plurality of lifting components (63); the lifting connecting plate (61) is fixedly arranged at the upper end of the connecting shaft (52); the lifting frame (62) is arranged on the lifting connecting plate (61); the lifting components (63) are arranged on the lifting frame (62).

5. The long-stroke screw drive device according to claim 4, characterized in that: The lifting component (63) is set as a lifting roller group (64); the lifting roller group (64) includes two rollers (65), and the axes of the two rollers (65) are arranged in parallel.

6. The long-stroke screw drive device according to claim 4, wherein: The lifting component (63) is set as a lifting plate (66); a groove (67) is provided on the lifting plate (66) for accommodating and supporting the lead screw (22).

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