Automatic screw tightening device

Abstract

The utility model discloses an automatic screw tightening device which comprises a back plate, a linear module, a lifting frame, a pressure maintaining unit, a mounting frame and a mechanical arm, the linear module is arranged on the back plate, the lifting frame is arranged on the linear module and driven by the linear module to move, the mounting frame is arranged on the lifting frame through the pressure maintaining unit, and the mechanical arm is arranged on the mounting frame. The pressure maintaining unit is used for abutting against the mechanical arm and the screws, and the mechanical arm is fixed to the mounting frame. According to the automatic screw tightening device, the pressure maintaining unit and the linear module are adopted, in the screw tightening process, stable thrust is kept on the mechanical arm all the time, the screwing consistency of a plurality of screws on the same product is guaranteed, the adjusting unit and the moving unit are matched, automatic in-place of the mechanical arm can be achieved, and positioning is rapid and accurate.

Description

Technical Field

[0001] The utility model relates to a screw tightening technology, in particular to an automatic screw tightening device. Background Art

[0002] Screws are tools that use the physics and mathematical principles of the circular rotation of an object's inclined surface and friction to gradually fasten objects and machine parts. Screws are a general term for fasteners and a daily colloquialism. Screws are an indispensable industrial necessity in daily life: such as the tiny screws used in cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; as for engineering, construction, and bridges, large screws and nuts are used; transportation equipment, airplanes, trams, cars, etc. use both large and small screws; screws have important tasks in industry;

[0003] The screw tightening method in the prior art is generally that a worker pre-screws the screw into a screw hole on a product, operates a screw tightening device to adjust a manipulator to align with the screw, provides a thrust to the screw tightening device, and the manipulator on the screw tightening device screws the screw in. The operation is complicated, and the thrust provided by the worker is extremely unstable, and it is very easy to screw too much or too little, resulting in difficulty in ensuring the screwing consistency of multiple screws on the same product and poor fixing effect. Utility Model Content

[0004] In order to solve the defects of the above-mentioned prior art, the utility model provides an automatic screw tightening device, which can always maintain a stable thrust during the screw tightening process to ensure the consistency of tightening multiple screws on the same product.

[0005] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: an automatic screw tightening device, including a back plate, a linear module, a lifting frame, a pressure holding unit, a mounting frame and a manipulator, the linear module is arranged on the back plate, the lifting frame is arranged on the linear module and is driven by the linear module to move, the mounting frame is arranged on the lifting frame through the pressure holding unit, the pressure holding unit is used to hold the manipulator against the screw, and the manipulator is fixed to the mounting frame.

[0006] Preferably, the pressure maintaining unit includes a gas spring, a first guide rail and a first slider, the first guide rail is fixed to the lifting frame, the first slider is fixed to the mounting frame and slides along the first guide rail, one end of the gas spring is fixed to the lifting frame, and the other end of the gas spring is fixed to the mounting frame.

[0007] Preferably, a base plate is fixed at the bottom of the back plate, an adjustment unit is provided under the base plate, the adjustment unit guides the base plate to move, the adjustment unit is arranged on the middle plate, a moving unit is provided under the middle plate, the moving unit is arranged on the base plate, and the middle plate is arranged between the base plate and the base plate.

[0008] Preferably, the adjustment unit includes a second guide rail, a second slider and a drive assembly, the second guide rail is fixed to the top of the middle plate, the second slider is fixed to the bottom of the base plate and slidingly cooperates with the second guide rail, the drive assembly includes a first motor, a first gear and a first rack, the first rack is fixed to the middle plate and arranged parallel to the second guide rail, the first gear is driven to rotate by the first motor and meshes with the first rack, and the first motor is fixed to the bottom of the base plate.

[0009] Preferably, the moving unit includes a third guide rail, a third slider and a power assembly, the third guide rail is fixed to the top of the base plate, the third slider is fixed to the bottom of the middle plate and slides with the third guide rail, the power assembly includes a second motor, a second gear and a second rack, the second rack is fixed to the base plate and arranged parallel to the third guide rail, the second gear is driven to rotate by the second motor and meshes with the second rack, and the second motor is fixed to the bottom of the middle plate.

[0010] In summary, the utility model has achieved the following technical effects:

[0011] The automatic screw tightening device of the utility model adopts a pressure-maintaining unit and a linear module. During the screw tightening process, a stable thrust is always maintained on the robot arm to ensure the consistency of screwing multiple screws on the same product. The adjustment unit and the moving unit are used in combination to realize automatic positioning of the robot arm and fast and accurate positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the automatic screw tightening device of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the automatic screw tightening device of the utility model;

[0014] Explanation of the reference numerals in the specification: 1. back plate; 2. linear module; 3. lifting frame; 4. first guide rail; 5. first slider; 6. mounting frame; 7. gas spring; 8. manipulator; 9. bottom plate; 10. first rack; 11. second guide rail; 12. second slider; 13. middle plate; 14. third slider; 15. third guide rail; 16. base plate; 17. second rack. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0016] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0017] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] Embodiment 1:

[0022] like Figure 2As shown, an automatic screw tightening device includes a back plate 1, a linear module 2, a lifting frame 3, a pressure holding unit, a mounting frame 6 and a manipulator 8, wherein the linear module 2 is arranged on the back plate 1, the lifting frame 3 is arranged on the linear module 2 and is driven by the linear module 2 to move, the mounting frame 6 is arranged on the lifting frame 3 through the pressure holding unit, the pressure holding unit is used to hold the manipulator 8 against the screw, and the manipulator 8 is fixed to the mounting frame 6; the pressure holding unit includes a gas spring 7, a first guide rail 4 and a first slider 5, the first guide rail 4 is fixed to the lifting frame 3, the first slider 5 is fixed to the mounting frame 6 and slides along the first guide rail 4, one end of the gas spring 7 is fixed to the lifting frame 3, and the other end of the gas spring 7 is fixed to the mounting frame 6.

[0023] The automatic screw tightening device of this embodiment adopts a pressure-maintaining unit and a linear module 2. During the screw tightening process, a stable thrust is always maintained on the manipulator 8 to ensure the consistency of screwing multiple screws on the same product.

[0024] like Figure 1 As shown, a bottom plate 9 is fixed to the bottom of the back plate 1, an adjustment unit is provided below the bottom plate 9, the adjustment unit guides the bottom plate 9 to move, the adjustment unit is arranged on the middle plate 13, a moving unit is provided below the middle plate 13, the moving unit is arranged on the base plate 16, and the middle plate 13 is arranged between the base plate 16 and the bottom plate 9; the adjustment unit includes a second guide rail 11, a second slider 12 and a driving assembly, the second guide rail 11 is fixed to the top of the middle plate 13, the second slider 12 is fixed to the bottom of the bottom plate 9 and slidably cooperates with the second guide rail 11, the driving assembly includes a first motor, a first gear and a first rack 10, the first rack 10 is fixed to the middle plate 1 3 and is arranged in parallel with the second guide rail 11, the first gear is driven to rotate by the first motor and meshes with the first rack 10, and the first motor is fixed to the bottom of the base plate 9; the moving unit includes a third guide rail 15, a third slider 14 and a power assembly, the third guide rail 15 is fixed to the top of the base plate 16, the third slider 14 is fixed to the bottom of the middle plate 13 and slidably cooperates with the third guide rail 15, the power assembly includes a second motor, a second gear and a second rack 17, the second rack 17 is fixed to the base plate 16 and is arranged in parallel with the third guide rail 15, the second gear is driven to rotate by the second motor and meshes with the second rack 17, and the second motor is fixed to the bottom of the middle plate 13.

[0025] The automatic screw tightening device of this embodiment adopts the cooperation of the adjustment unit and the moving unit, which can realize the automatic positioning of the manipulator 8 and fast and accurate positioning.

[0026] Working principle: First, adjust the position of the manipulator 8 through the adjustment unit and the moving unit so that the screws grasped by the manipulator 8 are aligned with the screw holes. Then the linear module 2 drives the lifting frame 3 to move, and cooperates with the pressure holding unit to provide continuous and stable thrust to the manipulator 8 during the screw tightening process, so that the tightening degree of multiple screws on the same product remains consistent.

[0027] The above description is only a preferred implementation mode of the present invention, and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. An automatic screw tightening device, characterized in that: It includes a back plate, a linear module, a lifting frame, a pressure-maintaining unit, a mounting frame and a manipulator. The linear module is arranged on the back plate, the lifting frame is arranged on the linear module and is driven to move by the linear module, the mounting frame is arranged on the lifting frame through the pressure-maintaining unit, the pressure-maintaining unit is used to hold the manipulator against screws, and the manipulator is fixed to the mounting frame.

2. An automatic screw tightening device according to claim 1, characterized in that: The pressure-maintaining unit includes a gas spring, a first guide rail and a first slider, wherein the first guide rail is fixed to the lifting frame, the first slider is fixed to the mounting frame and slides along the first guide rail, one end of the gas spring is fixed to the lifting frame, and the other end of the gas spring is fixed to the mounting frame.

3. The automatic screw tightening device according to claim 1, characterized in that: A bottom plate is fixed at the bottom of the back plate, an adjustment unit is provided below the bottom plate, the adjustment unit guides the bottom plate to move, the adjustment unit is arranged on the middle plate, a moving unit is provided below the middle plate, the moving unit is arranged on the base plate, and the middle plate is arranged between the base plate and the bottom plate.

4. The automatic screw tightening device according to claim 3, characterized in that: The adjusting unit includes a second guide rail, a second slider and a driving assembly, wherein the second guide rail is fixed to the top of the middle plate, the second slider is fixed to the bottom of the bottom plate and slidably cooperates with the second guide rail, the driving assembly includes a first motor, a first gear and a first rack, the first rack is fixed to the middle plate and arranged parallel to the second guide rail, the first gear is driven to rotate by the first motor and meshes with the first rack, and the first motor is fixed to the bottom of the bottom plate.

5. The automatic screw tightening device according to claim 3, characterized in that: The moving unit includes a third guide rail, a third slider and a power assembly, wherein the third guide rail is fixed to the top of the base plate, the third slider is fixed to the bottom of the middle plate and slidably cooperates with the third guide rail, and the power assembly includes a second motor, a second gear and a second rack, wherein the second rack is fixed to the base plate and arranged parallel to the third guide rail, the second gear is driven to rotate by the second motor and meshes with the second rack, and the second motor is fixed to the bottom of the middle plate.

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