Device for automatically fixing screw on workpiece

Abstract

The utility model discloses a device for automatically fixing a screw on a workpiece, which is used for connecting a first workpiece and a second workpiece in a counterpoint and screwing manner, and comprises a first positioning component, a second positioning component, a transfer component and a screwing component, the first positioning assembly is used for shaping and positioning a first workpiece; the second positioning assembly is used for positioning a second workpiece; the transfer assembly is used for transferring the first workpiece to the second workpiece, so that a connecting hole in the first workpiece is aligned with a connecting hole in the second workpiece; the screw hitting assembly is used for hitting screws into the connecting holes formed after the first workpiece and the second workpiece are aligned. Through cooperation of the first positioning assembly, the second positioning assembly, the third positioning assembly, the transfer assembly and the conveying line, the alignment screw-driving fixing process of the outdoor unit chassis and the condenser is achieved, the whole process is automatic, the machining efficiency is high, and the labor intensity of workers and errors of manual operation are reduced.

Description

Technical Field

[0001] This utility model relates to the field of automatic screw-driving equipment technology, and in particular to a device for automatically screwing the chassis of an air conditioner outdoor unit to the condenser. Background Technology

[0002] Currently, the assembly of the outdoor unit chassis and condenser in the air conditioning industry relies on manual operation. Workers need to repeat positioning and alignment actions for a long time, which can easily lead to omissions or misalignments. Manual assembly results in high labor intensity for workers, low production efficiency, and unreliable processing quality. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for automatically fixing screws to workpieces, so as to solve the technical problems of low efficiency and high labor intensity caused by the existing manual assembly of outdoor unit chassis and condensers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An embodiment of this utility model provides an automatic screw fixing device for aligning and screwing a first workpiece and a second workpiece together, comprising: a first positioning component, a second positioning component, a transfer component, and a screw-driving component;

[0006] The first positioning component is used to shape and position the first workpiece;

[0007] The second positioning component is used to position the second workpiece;

[0008] The transfer assembly is used to transfer the first workpiece to the second workpiece so that the connecting hole on the first workpiece is aligned with the connecting hole on the second workpiece;

[0009] The screw-driving assembly is used to drive screws into the connection hole after the first workpiece and the second workpiece are aligned.

[0010] The first positioning component includes: a positioning bracket, an X-axis positioning unit and a Y-axis positioning unit connected to the positioning bracket; wherein, the positioning bracket is provided with a positioning plane, and a first side plate and a second side plate are provided on adjacent sides of the positioning plane, which are perpendicular to each other; the X-axis positioning unit and the Y-axis positioning unit are both disposed on the positioning plane, and the X-axis positioning unit and the Y-axis positioning unit are perpendicular to the first side plate and the second side plate, respectively.

[0011] The X-axis positioning unit and the Y-axis positioning unit have the same structure, both including: a positioning power component and a positioning plate controlled by the moving end of the positioning power component.

[0012] The transfer assembly includes: a robotic arm, a connecting plate connected to the robotic arm, and at least two sets of opening and closing gripping units connected to the connecting plate. The opening and closing gripping units are controlled to open and close to grip the first workpiece and are transferred to the second workpiece by the robotic arm.

[0013] The opening and closing clamping unit includes: an opening and closing power component, a clamping plate connected to the moving end of the opening and closing power component, and an alignment clamping plate disposed opposite to the clamping plate. The opening and closing power component drives the clamping plate to move closer to or away from the alignment clamping plate.

[0014] The second positioning component includes two sets of positioning units that are opposite to each other. Each positioning unit includes a driving member and a positioning arm connected to the moving end of the driving member. The positioning arm is controlled by the driving member to move relative to the driving member in order to position the second workpiece.

[0015] The device for automatically fixing screws to the workpiece further includes a third positioning component that cooperates with the second positioning component. The third positioning component is used to stop the second workpiece and forms a positioning direction perpendicular to the second positioning component.

[0016] The third positioning component includes: a mounting plate, a linear drive and a slider connected to the mounting plate, and a guide rail slidably connected to the slider. The moving end of the linear drive is also connected to the guide rail, such that the linear drive drives the guide rail to synchronously extend and retract along the slider.

[0017] The moving end of the linear drive component is connected to the guide rail via a floating joint.

[0018] The device for automatically fixing screws to the workpiece further includes a conveyor line, with the first positioning component and the second positioning component respectively disposed on both sides of the conveyor line, the transfer component disposed above the conveyor line, and the screw-driving component disposed below the conveyor line.

[0019] The present invention relates to an automatic screw fixing device for fixing screws to workpieces. Through the cooperation of a first positioning component, a second positioning component, a third positioning component, a transfer component and a conveyor line, it realizes the alignment and screw fixing process between the outdoor unit chassis and the condenser. The process is fully automated, with high processing efficiency, and reduces the labor intensity of workers and the error of manual operation.

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the first positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0023] Figure 3 The first positioning of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention. Partial top view.

[0024] Figure 4 This is a front view of the first positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0025] Figure 5 This is a side view of the first positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the transfer component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0027] Figure 7 This is a front view of the transfer component portion of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0028] Figure 8 This is a side view of the transfer component portion of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0029] Figure 9 This is a top view of the transfer component portion of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the third positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0031] Figure 11 This is a top view of the third positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0032] Figure 12 This is a side view of the third positioning component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0033] Figure 13 This is a schematic diagram of the screw-driving component of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0034] Figure 14 This is a side view of the screw-driving assembly of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0035] Figure 15 This is a front view of the screw-driving assembly of the device for automatically fixing screws to a workpiece according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100 Automatic device for fixing screws to workpiece, 21 Positioning bracket, 22 First side plate, 23 Second side plate, 24 Positioning plane, 25 X-axis positioning unit, 251 Positioning power component, 252 Positioning plate, 26 Y-axis positioning unit, 261 Positioning power component, 262 Positioning plate, 211 Fixing plate, 3 Transfer assembly, 31 Connecting plate, 311 Flange, 32 Opening and closing power component, 33 Opening and closing power component, 34 Clamping plate, 35 Alignment clamping plate, 36 Clamping plate, 37 Alignment clamping plate, 4 Third positioning assembly, 41 Mounting plate, 42 Linear drive component, 43 Slider, 44 Guide rail, 45 Floating joint, 46 Connector, 5 Robotic arm, 6 Screw-driving assembly, 61 Connecting column, 62 Lifting unit, 63 Horizontal movement unit, 64 Electric screw-driving unit, 7 Second positioning assembly, 1 Conveyor line, 200 First workpiece, 300 Second workpiece. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Currently, the assembly of the outdoor unit chassis and condenser in the air conditioning industry relies on manual operation. Workers need to repeat positioning and alignment actions for a long time, which easily leads to missed or misaligned screws. Manual assembly is labor-intensive, inefficient, and produces unreliable quality. Therefore, based on the above requirements, this embodiment provides a device 100 for automatically fixing screws to the workpiece.

[0046] Please see Figures 1 to 15This embodiment discloses an automatic screw-fixing device 100 for fixing screws to workpieces. This device 100 is used to align and screw together a first workpiece 200 and a second workpiece 300. In this embodiment, the first workpiece 200 is the condenser of an air conditioner, and the second workpiece 300 is the outdoor unit chassis. The outdoor unit chassis is connected to the bottom of the condenser by screw alignment. It is understood that in other embodiments, the first workpiece 200 and the second workpiece 300 can be any other components; the purpose is to achieve the alignment and screw-fixing connection process between the two.

[0047] The automatic screw-fixing device 100 includes: a first positioning component 2, a second positioning component 7, a transfer component 3, and a screw-driving component 6;

[0048] The first positioning component 2 is used to shape and position the first workpiece 200;

[0049] The second positioning component 7 is used to position the second workpiece 300;

[0050] The transfer component 3 is used to transfer the first workpiece 200 to the second workpiece 300 so that the connecting hole on the first workpiece 200 is aligned with the connecting hole on the second workpiece 300.

[0051] The screw-driving assembly 6 is used to drive screws into the connecting holes after the first workpiece 200 and the second workpiece 300 are aligned.

[0052] The device 100 for automatically fixing screws to workpieces in this embodiment uses a first positioning component 2 to accurately position a first workpiece 200, and a second positioning component 7 to accurately position a second workpiece 300. Then, a transfer component 3 aligns and assembles the positioned first workpiece 200 and second workpiece 300 so that their connecting holes are aligned. Finally, a screw-driving component 6 drives screws into the aligned connecting holes to connect and fix the first workpiece 200 and second workpiece 300. The entire process requires no manual intervention, has a high degree of automation, and has a low probability of missing or misaligning screws, which significantly improves assembly efficiency and quality.

[0053] Please refer to it again. Figures 2 to 5 The first positioning component 2 includes: a positioning bracket 21, an X-axis positioning unit 25 and a Y-axis positioning unit 26 connected to the positioning bracket 21; wherein, the positioning bracket 21 is provided with a positioning plane 24, and the adjacent sides of the positioning plane 24 are provided with a first side plate 22 and a second side plate 23 that are perpendicularly distributed to each other, the X-axis positioning unit 25 and the Y-axis positioning unit 26 are both disposed on the positioning plane 22, and the positioning directions of the X-axis positioning unit 25 and the Y-axis positioning unit 26 are perpendicular to each other.

[0054] like Figure 2As shown, the first workpiece 200 condenser in this embodiment has an L-shaped structure, thus requiring positioning in two directions. The X-direction positioning unit 25 and the second side plate 23 cooperate to achieve positioning in one direction, while the Y-direction positioning unit 26 is positioned opposite the first side plate 22 to achieve positioning in the other direction. The positioning directions of the X-direction positioning unit 25 and the Y-direction positioning unit 26 are perpendicular to each other, corresponding precisely to the L-shaped condenser structure, thereby achieving the positioning of the first workpiece 200. Before positioning, the first workpiece 200 is transferred from the production line to the positioning plane 22 of the first positioning assembly 2. The X-direction positioning unit 25 and the Y-direction positioning unit 26 are then controlled to move the first workpiece 200 and position it on the first side plate 22 and the second side plate 23, respectively.

[0055] In this embodiment, the X-axis positioning unit 25 and the Y-axis positioning unit 26 are arranged vertically, meaning the Y-axis positioning unit 26 is connected to the top of the X-axis positioning unit 25. In other embodiments, the X-axis positioning unit 25 and the Y-axis positioning unit 26 can also be designed to be independently connected to the positioning plane 22.

[0056] The X-axis positioning unit 25 includes: a positioning power component 251 and a positioning plate 252 controlled by the moving end of the positioning power component 251.

[0057] The Y-axis positioning unit 26 includes: a positioning power component 261 and a positioning plate 262 controlled by the moving end of the positioning power component 261.

[0058] Both the positioning power component 251 and the positioning power component 261 are cylinders. In other embodiments, linear power units such as servos and lead screws may also be used.

[0059] The bottom of the support leg of the positioning bracket 21 is also connected to a fixing plate 211, through which the first positioning component 2 can be connected to the equipment base or the factory floor.

[0060] Please refer to it again. Figures 6 to 9 The transfer assembly 3 includes: a robotic arm 5, a connecting plate 31 connected to the robotic arm 5, and at least two sets of opening and closing gripping units connected to the connecting plate 31. The opening and closing gripping units are controlled to open and close to grip the first workpiece 200 and follow the robotic arm 5 to transfer to the second workpiece 300.

[0061] One set of the opening and closing clamping units includes: an opening and closing power member 32, a clamping plate 34 connected to the moving end of the opening and closing power member 32, and an alignment clamping plate 35 disposed opposite to the clamping plate 34. The opening and closing power member 32 drives the clamping plate 34 to move closer to or away from the alignment clamping plate 35. Since the first workpiece 200 in this embodiment is a condenser, it can be transferred by using a planar clamping jaw. The clamping plate 34 and the corresponding alignment clamping plate 35 are not limited to plate-shaped parts, and can also be changed according to the shape of the clamping surface of the actual second workpiece 200.

[0062] Another set of opening and closing clamping units includes an opening and closing power member 33, a clamping plate 36 connected to the moving end of the opening and closing power member 33, and an alignment clamping plate 37 disposed opposite to the clamping plate 36. The opening and closing power member 33 drives the clamping plate 36 to move closer to or away from the alignment clamping plate 37. Similarly, since the first workpiece 200 in this embodiment is a condenser, it can be transferred by using a planar clamping jaw. The clamping plate 36 and the corresponding alignment clamping plate 37 are not limited to plate-shaped parts, and can also be changed according to the shape of the clamping surface of the actual second workpiece 200.

[0063] The opening and closing power component 32 (33) is a drive cylinder. In other embodiments, other linear drive modules may also be used.

[0064] The connecting plate 31 is also provided with a flange 311, and the robot arm 5 is connected to the flange 311, thereby driving the connecting plate 31 and its opening and closing clamping unit to transfer the first workpiece 200.

[0065] Please refer to it again. Figure 1 The second positioning component 7 includes two sets of positioning units arranged opposite each other. Each positioning unit includes a driving member and a positioning arm connected to the moving end of the driving member. The positioning arm is controlled by the driving member to move relative to the driving member to position the second workpiece 200. Specifically, the two sets of positioning units of the second positioning component 7 are respectively arranged opposite each other on both sides of the conveyor line 1. They use a cylinder to drive the clamping arms to move closer together, thereby positioning the second workpiece 300 located on the conveyor line 1.

[0066] In order to stop the second workpiece 300 and cooperate with the second positioning component 7 to achieve precise positioning, the device 100 for automatically fixing screws to the workpiece further includes a third positioning component 4 that cooperates with the second positioning component 7. The third positioning component 4 is used to stop the second workpiece 300 and to position the second workpiece 300 in a positioning direction perpendicular to the second positioning component 7.

[0067] like Figure 1As shown, when the second workpiece 300 is conveyed on the conveyor line 1, its position and angle on the conveyor line 1 are uncertain. The third positioning component 4 stops the second workpiece 300 and positions it in its conveying direction. The second positioning component 7, located on the side of the conveyor line 1, performs secondary positioning. The positioning directions of the second positioning component 7 and the third positioning component 4 are perpendicular to each other. The outer chassis of the second workpiece 300 is a rectangular plate, which can be precisely positioned by adjusting the perpendicular directions.

[0068] Please refer to it again. Figures 10 to 12 The third positioning component 4 includes: a mounting plate 41, a linear drive 42 and a slider 43 connected to the mounting plate 41, and a guide rail 44 slidably connected to the slider 43. The moving end of the linear drive 42 is also connected to the guide rail 44, so that the linear drive 42 drives the guide rail 44 to move synchronously along the slider 43. Specifically, the driving direction of the linear drive 42 is parallel to the moving direction of the guide rail 44, so the linear drive 42 can drive the guide rail 44 to reciprocate along the guiding direction of the slider 43. The connecting plate 41 of the third positioning component 4 is connected to the bracket of the conveyor line 1. When the linear drive 42 moves, it drives the guide rail 44 to extend from the surface of the conveyor line 1, stopping the second workpiece 300 and positioning it in one direction. After completing one screw connection and fixing, it retracts again, waiting for the next execution command.

[0069] In this embodiment, there are two sliders 43, and the guides of the two sliders 43 are parallel to the driving direction of the linear drive member 42.

[0070] To reduce the linkage loss between the guide rail 44 and the linear drive component 42 and ensure smooth long-term operation, a floating joint 45 is used to connect the moving end of the linear drive component 42 to the guide rail 44. Specifically, the moving end of the linear drive component 42 is connected to the floating joint 45, and the other end of the floating joint 45 is connected to a connector 46, which in turn is connected to the guide rail 44. Using the floating joint 45 allows for greater compatibility between the linear drive component 42 and the guide rail 44 during operation, reducing operational losses and resistance.

[0071] Please refer to it again. Figure 1 The device 100 for automatically fixing screws to a workpiece further includes a conveyor line 1. The first positioning component 2, the third positioning component 4, and the second positioning component 7 are respectively disposed on both sides of the conveyor line 1. The transfer component 3 is disposed above the conveyor line 1, and the screw-driving component 6 is disposed below the conveyor line 1.

[0072] In this embodiment, the conveyor line 1 is a roller conveyor line. In other embodiments, conveyor belts, conveyor chains, or other conveying mechanisms may also be used.

[0073] Please refer to it again. Figures 13 to 15 The screw-driving assembly 6 includes: a connecting column 61, a lifting unit 62 fixed to the connecting column 61, a horizontal moving unit 63 connected to the lifting end of the lifting unit 62, and an electric screw-driving unit 64 connected to the moving end of the horizontal moving unit 63. The electric screw-driving unit 64 is prior art, comprising a screw vibration feeding module and an electric screwdriver, which work together to achieve screw feeding and screw-driving processes.

[0074] It should be noted that the device 100 for automatically fixing screws to workpieces in this embodiment also includes a controller, such as an industrial computer or PLC, and sensors that provide data references to the controller. The power units of the first positioning component 2, the second positioning component 7, the third positioning component 4, the transfer component 3, and the screw-driving component 6 are all controlled by the controller. The controller controls the above components to perform the screw-driving process in an orderly manner according to the acquired information and the operation control logic.

[0075] Please refer to the following again. Figures 1 to 15 Briefly describe the working process of the device 100 that automatically fixes screws to the workpiece in this embodiment:

[0076] Step 1: After the first workpiece 200 is processed by the previous production line, it is transferred to the positioning plane 22 of the first positioning component 2. The X-axis positioning unit 25 and the Y-axis positioning unit 26 are activated to push the first workpiece 200 in the X and Y directions respectively, so that it abuts against the first side plate 22 and the second side plate 23.

[0077] In the second step, almost simultaneously with the first step, the second workpiece 300 is stopped by the third positioning component 4, and the second positioning component 7 is activated. The two work together to complete the positioning of the second workpiece 300.

[0078] The third step is to transfer the first workpiece 200, which has been positioned, to the second workpiece 300, which has been positioned. At this time, the connecting holes on the first workpiece 200 and the second workpiece 300 are accurately aligned.

[0079] Step 4: Start the screw-driving assembly 6 to drive the screws into the connecting holes, thereby completing the alignment and connection of the first workpiece 200 and the second workpiece 300.

[0080] By repeating the above steps, the automatic assembly of the condenser and the outdoor unit chassis by the alignment screws can be completed continuously.

[0081] The device for automatically fixing screws to the workpiece in this embodiment achieves the alignment and screw fixing process between the outdoor unit chassis and the condenser through the cooperation of the first positioning component, the second positioning component, the third positioning component, the transfer component and the conveyor line. The process is fully automated, with high processing efficiency, reducing the labor intensity of workers and the error of manual operation.

[0082] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A device for automatically fastening a screw to a workpiece, for aligning a first workpiece with a second workpiece for screwing, characterized by, The device comprises: a first positioning assembly, a second positioning assembly, a transfer assembly and a screwing assembly; the first positioning assembly is used for shaping and positioning a first workpiece; the second positioning assembly is used for positioning a second workpiece; the transfer assembly is used for transferring the first workpiece to the second workpiece so as to align the connecting holes on the first workpiece with the connecting holes on the second workpiece; the screwing assembly is used for screwing a screw into the connecting holes of the first workpiece and the second workpiece after alignment.

2. The apparatus of claim 1, wherein, The first positioning assembly comprises a positioning support, an X-direction positioning unit and a Y-direction positioning unit connected to the positioning support; wherein the positioning support is provided with a positioning plane, adjacent sides of the positioning plane are provided with a first side plate and a second side plate which are perpendicular to each other, the X-direction positioning unit and the Y-direction positioning unit are arranged on the positioning plane, and the positioning directions of the X-direction positioning unit and the Y-direction positioning unit are perpendicular to the first side plate and the second side plate respectively.

3. The apparatus of claim 2, wherein, The X-direction positioning unit and the Y-direction positioning unit are the same in structure and each comprises a positioning power member and a positioning plate at a moving end controlled by the positioning power member.

4. The apparatus of claim 1, wherein, The transfer assembly comprises a mechanical hand, a connecting plate connected to the mechanical hand, and at least two groups of opening and closing clamping units connected to the connecting plate; the opening and closing clamping units are controlled to open and close to clamp the first workpiece and are transferred to the second workpiece following the mechanical hand.

5. The apparatus of claim 4, wherein, The opening and closing clamping unit comprises an opening and closing power member, a clamping plate at a moving end connected to the opening and closing power member, and an alignment clamping plate arranged opposite to the clamping plate; the opening and closing power member drives the clamping plate to move close to or away from the alignment clamping plate.

6. The apparatus of claim 1, wherein: The second positioning assembly comprises two groups of positioning units which are oppositely arranged; the positioning unit comprises a driving member and a positioning arm at a moving end connected to the driving member; the positioning arm is controlled to move oppositely by the driving member to complete the positioning of the second workpiece.

7. The apparatus of claim 6 wherein, The device for automatically fixing a screw on a workpiece further comprises a third positioning assembly matched with the second positioning assembly; the third positioning assembly is used for stopping the second workpiece and forms a vertical positioning direction with the second positioning assembly.

8. The apparatus of claim 7, wherein, The third positioning assembly comprises a mounting plate, a linear driving member and a sliding block connected to the mounting plate, and a guide rail slidingly connected to the sliding block; a moving end of the linear driving member is further connected to the guide rail, so that the linear driving member drives the guide rail to synchronously stretch and retract along the sliding block.

9. The apparatus of claim 8, wherein, A floating joint is adopted to connect between the moving end of the linear driving member and the guide rail.

10. The apparatus for automatically fastening a screw to a workpiece according to any one of claims 1 to 9, wherein The device for automatically fixing a screw on a workpiece further comprises a conveying line; the first positioning assembly and the second positioning assembly are arranged on two sides of the conveying line respectively; the transfer assembly is arranged above the conveying line; and the screwing assembly is arranged below the conveying line.

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