Lead screw pair with limiting protection function

Abstract

The lead screw pair with the limiting protection function comprises a lead screw, the surface of the lead screw is rotationally connected with a nut, the surfaces of the two ends of the lead screw are rotationally connected with two end plates through bearings, supporting assemblies are fixed to the bottom ends of the two end plates, and the end plates are fixedly installed through the supporting assemblies. The adjacent sides of the two end plates are each provided with a limiting assembly. According to the utility model, the lead screw, the nut, the two end plates, the two supporting assemblies and the two limiting assemblies are arranged, the two ends of the lead screw are rotatably connected with the two end plates through the bearings respectively, the end plates are fixedly installed through the supporting assemblies, and when the nut moves along the lead screw and extrudes the sliding sleeve of any limiting assembly, the annular plate will extrude the contact switch. And a control system of the equipment is triggered by the contact switch to stop driving the lead screw to continuously rotate, so that the limiting protection effect is achieved. The height of the lead screw can be adjusted through the supporting assembly, and installation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rod pairs, in particular to a screw rod pair with position limiting protection. Background Art

[0002] A lead screw assembly is a mechanical component consisting of a screw, nut, and balls. Its function is to convert rotational motion into linear motion, or vice versa. It is a further development of the traditional sliding screw. This development has the same profound significance as the transformation of rolling bearings from sliding bearings. Due to their excellent friction characteristics, ball screws are widely used in various industrial equipment, precision instruments, and precision CNC machine tools.

[0003] When a lead screw assembly is in use, the device drives the lead screw, which in turn drives the nut along its length. Typically, the device incorporates limit switches or employs programming to limit the nut's movement. These two methods, known as hard and soft limits, respectively, limit the nut's position. However, if the device's limit switches malfunction or a program error occurs, there's no backup plan to ensure the safe operation of the lead screw assembly. Furthermore, dust particles on the lead screw surface can wear away the ball bearings inside the nut, shortening the lifespan of the lead screw assembly. Therefore, further improvements are needed. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a screw rod pair with limit protection.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a screw pair with limit protection, including a screw, a nut rotatably connected to the surface of the screw, and two end surfaces of the screw rotatably connected to two end plates through bearings, and the bottom ends of the two end plates are fixed with support assemblies, and the end plates are fixedly installed through the support assemblies, and the adjacent sides of the two end plates are installed with limit assemblies, and a detachable cleaning assembly is fixedly installed on one end of the nut surface.

[0006] Furthermore, the support assembly includes a base plate, and a plurality of mounting holes are opened on the base plate. A guide sleeve is fixed to the upper surface of the base plate, a vertical plate is slidably connected to the top of the guide sleeve, the top of the vertical plate is fixedly connected to the end plate, and a reinforcing plate is fixedly connected between the upper surface of the base plate and the outer wall of the guide sleeve.

[0007] Furthermore, a first bolt passes through and is threadedly connected to the side wall of the top end of the guide sleeve.

[0008] Furthermore, the limiting assembly includes a fixed sleeve fixed to the surface of the end plate, and a sliding sleeve is slidably connected to the surface of the fixed sleeve, and a ring plate is fixed to the side of the sliding sleeve close to the end plate. The limiting assembly also includes a contact switch fixed to the surface of the end plate.

[0009] Furthermore, a spring is fixedly connected between the ring plate and the end plate.

[0010] Furthermore, the cleaning assembly includes an annular sleeve, and the annular sleeve is sleeved on the surface of the nut. The annular sleeve is provided with a circular opening on the side away from the nut, and bristles are provided inside the circular opening. A second bolt is passed through the side wall of the annular sleeve and threadedly connected. One end of the second bolt is located inside the annular sleeve and fits against the outer wall of the nut.

[0011] Furthermore, the annular sleeve is composed of two semicircular sleeves, and the two semicircular sleeves are fixed by screws.

[0012] Beneficial effects of the utility model:

[0013] 1. When in use, the present invention comprises a screw pair with position limiting protection, comprising a screw, a nut, two end plates, two support assemblies, and two position limiting assemblies. The ends of the screw are rotatably connected to the two end plates via bearings, and the end plates are fixedly mounted via the support assemblies. When the nut moves along the screw and presses the sliding sleeve of any position limiting assembly, the ring plate presses the contact switch, which then triggers the control system of the device to stop driving the screw to continue rotating, thereby achieving the position limiting protection function. The support assembly allows the screw height to be adjusted, facilitating installation.

[0014] 2. When the utility model is in use, the screw pair with limit protection is provided with a cleaning component, which includes an annular sleeve. The annular sleeve is fixed to one end of the nut. When the nut moves, the annular sleeve can be driven to move, so that the bristles on the inner wall of the annular sleeve are used to clean the surface of the screw. Dust on the surface of the screw wears the ball inside the nut, and the cleaning can be disassembled and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 : Overall schematic diagram of the utility model;

[0017] Figure 2 : A three-dimensional diagram of the support assembly of the present invention;

[0018] Figure 3 :The utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 4 : A three-dimensional diagram of the cleaning component of the present invention.

[0020] The reference numerals are as follows:

[0021] 1. Screw; 2. Nut; 3. End plate; 4. Support assembly; 41. Base plate; 42. Guide sleeve; 43. Vertical plate; 44. First bolt; 45. Reinforcement plate; 5. Limit assembly; 51. Fixed sleeve; 52. Sliding sleeve; 53. Ring plate; 54. Contact switch; 55. Spring; 6. Cleaning assembly; 61. Annular sleeve; 62. Circular opening; 63. Brush; 64. Second bolt. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-Figure 4 As shown, it relates to a screw pair with limit protection, including a screw 1, a nut 2 is rotatably connected to the surface of the screw 1, and two end plates 3 are rotatably connected to the surfaces of both ends of the screw 1 through bearings. Support components 4 are fixed to the bottom ends of the two end plates 3, and the end plates 3 are fixedly installed through the support components 4. Limit components 5 are installed on adjacent sides of the two end plates 3, and a detachable cleaning component 6 is fixedly installed on one end of the surface of the nut 2.

[0024] The support assembly 4 includes a base plate 41, and a plurality of mounting holes are opened on the base plate 41. A guide sleeve 42 is fixed to the upper surface of the base plate 41. A vertical plate 43 is slidably connected to the top of the guide sleeve 42. The top of the vertical plate 43 is fixedly connected to the end plate 3. A reinforcing plate 45 is fixedly connected between the upper surface of the base plate 41 and the outer wall of the guide sleeve 42.

[0025] The bottom plate 41 can be fixed to the device in use through the mounting hole. During installation, the vertical plate 43 can be moved along the guide sleeve 42 to adjust the height of the end plate 3 so that the screw 1 can dock with the driving component of the device.

[0026] A first bolt 44 passes through and is threadedly connected to the side wall of the top end of the guide sleeve 42 .

[0027] After the vertical plate 43 has been moved and adjusted, the vertical plate 43 can be squeezed and fixed by tightening the first bolt 44 .

[0028] The limiting assembly 5 includes a fixed sleeve 51 fixed to the surface of the end plate 3, and a sliding sleeve 52 is slidably connected to the surface of the fixed sleeve 51. A ring plate 53 is fixed to the side of the sliding sleeve 52 close to the end plate 3. The limiting assembly 5 also includes a contact switch 54 fixed to the surface of the end plate 3.

[0029] In this embodiment, the contact switch 54 is connected to the control system of the device. When the nut 2 moves along the screw 1 and squeezes any sliding sleeve 52, the ring plate 53 on the sliding sleeve 52 will squeeze the corresponding contact switch 54. The contact switch 54 will feed back the signal to the control system of the device. The control system controls the component that drives the screw 1 to rotate to stop rotating, thereby cooperating with the limit switch of the device itself to achieve double protection.

[0030] A spring 55 is fixedly connected between the ring plate 53 and the end plate 3. When the sliding sleeve 52 is not squeezed, the spring 55 can push the ring plate 53 to reset.

[0031] The cleaning assembly 6 includes an annular sleeve 61, and the annular sleeve 61 is sleeved on the surface of the nut 2. A circular opening 62 is opened on the side of the annular sleeve 61 away from the nut 2, and bristles 63 are provided inside the circular opening 62. A second bolt 64 is passed through the side wall of the annular sleeve 61 and is threadedly connected. One end of the second bolt 64 is located inside the annular sleeve 61 and fits against the outer wall of the nut 2.

[0032] When the nut 2 moves along the surface of the lead screw 1 , the bristles 63 on the inner wall of the annular sleeve 61 can brush off the dust adsorbed on the surface of the lead screw 1 , thereby preventing the dust from wearing the balls.

[0033] The annular sleeve 61 is composed of two semicircular sleeves, and the two semicircular sleeves are fixed by screw splicing. Therefore, when the bristles 63 are seriously worn and need to be replaced, the annular sleeve 61 can be split into two semicircular sleeves, thereby facilitating the removal of the annular sleeve 61 from the surface of the nut 2.

[0034] Working principle: During installation, fix the base plate 41 on the device in use, and then connect the contact switch 54 to the control system of the device through a signal line. When the driving component of the device drives the screw 1 to rotate, the screw 1 drives the nut 2 to move. If the limit switch of the device itself fails and cannot be limited, the nut 2 will hit any sliding sleeve 52, thereby driving the ring plate 53 to squeeze the contact switch 54. After the contact switch 54 is fed back to the control system of the device, the control system controls the driving component to stop working, thereby achieving protection for the screw pair.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A screw pair with position limit protection, comprising a screw (1), characterized in that: The surface of the lead screw (1) is rotatably connected to a nut (2), and the surfaces at both ends of the lead screw (1) are rotatably connected to two end plates (3) through bearings. The bottom ends of the two end plates (3) are fixed with support assemblies (4), and the end plates (3) are fixedly mounted through the support assemblies (4). The adjacent sides of the two end plates (3) are both installed with limiting assemblies (5), and a detachable cleaning assembly (6) is fixedly mounted on one end of the surface of the nut (2).

2. The screw rod pair with position limit protection according to claim 1, characterized in that: The support assembly (4) includes a base plate (41) with a plurality of mounting holes formed thereon. A guide sleeve (42) is fixed to the upper surface of the base plate (41). A vertical plate (43) is slidably connected to the top of the guide sleeve (42). The top of the vertical plate (43) is fixedly connected to the end plate (3). A reinforcing plate (45) is fixedly connected between the upper surface of the base plate (41) and the outer side wall of the guide sleeve (42).

3. The screw rod pair with position limit protection according to claim 2, characterized in that: A first bolt (44) is threadedly connected through the top side wall of the guide sleeve (42).

4. The screw rod pair with position limit protection according to claim 1, characterized in that: The position limiting assembly (5) comprises a fixed sleeve (51) fixed to the surface of the end plate (3), and a sliding sleeve (52) is slidably connected to the surface of the fixed sleeve (51), and a ring plate (53) is fixed to the side of the sliding sleeve (52) close to the end plate (3). The position limiting assembly (5) also comprises a contact switch (54) fixed to the surface of the end plate (3).

5. The screw rod pair with position limit protection according to claim 4, characterized in that: A spring (55) is fixedly connected between the ring plate (53) and the end plate (3).

6. The screw rod pair with position limit protection according to claim 1, characterized in that: The cleaning assembly (6) comprises an annular sleeve (61), and the annular sleeve (61) is sleeved on the surface of the nut (2), a circular opening (62) is opened on the side of the annular sleeve (61) away from the nut (2), and bristles (63) are provided inside the circular opening (62), and a second bolt (64) is passed through the side wall of the annular sleeve (61) and is threadedly connected, and one end of the second bolt (64) is located inside the annular sleeve (61) and is in contact with the outer wall of the nut (2).

7. The screw rod pair with position limit protection according to claim 6, characterized in that: The annular sleeve (61) is composed of two semicircular sleeves, and the two semicircular sleeves are fixed by splicing with screws.

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