A locking mechanism for pre-tightening

Abstract

This utility model discloses a locking mechanism for pre-tightening, including a base, a locking module, and a driver. The driver is fixed to the base and connected to the locking module, and is used to drive the locking module to move longitudinally. The locking module includes a slide, a motor, a screwdriver, a sensor, and a sensing plate. The slide is slidably connected to the base longitudinally and is connected to the driver. The motor is fixed to the slide and is connected to the screwdriver to drive the screwdriver to rotate. The screwdriver has a downward-through negative pressure channel for adsorbing the screw. The sensor is fixed to the slide, and the sensing plate is clamped on the screwdriver. The sensor is used to sense the number of rotations of the sensing plate and is signal-connected to the motor. This solution can control the number of screw locking rotations and facilitates adjustment of the final screw locking posture.

Description

Technical Field

[0001] This utility model relates to the technical field of automated screw fastening, and more particularly to a fastening mechanism for pre-tightening. Background Technology

[0002] Currently, most screw fastening operations are done manually, where operators use electric screwdrivers to fasten screws to designated positions on the workpiece. This method is labor-intensive, and prolonged work can easily lead to fatigue, resulting in missed fastening positions or poor fastening quality. A small number of automatic screw fastening mechanisms have been adopted, but these mechanisms cannot fasten screws to designated workpieces according to a preset number of turns, and the final posture of the screw after fastening cannot be adjusted. This fails to meet the production requirements of both tightening screws to a specified number of turns and facilitating adjustment of the final fastening posture. Therefore, improvements to the existing screw fastening mechanisms are necessary. Utility Model Content

[0003] This utility model provides a locking mechanism for pre-tightening, which mainly solves the technical problem of how to control the number of turns of the automatically locking screw and also facilitate the adjustment of the final locking posture of the screw.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A locking mechanism for pre-tightening includes a base, a locking module, and a driver;

[0006] The driver is fixed to the base and connected to the locking module, and the driver is used to drive the locking module to move longitudinally.

[0007] The locking module includes a slide, a motor, a screwdriver, a sensor, and a sensing plate. The slide is slidably connected to the base in the longitudinal direction and is connected to the driver. The motor is fixed on the slide and is connected to the screwdriver to drive it to rotate. The screwdriver has a downward-through negative pressure channel for adsorbing screws. The sensor is fixed on the slide, and the sensing plate is clamped on the screwdriver. The sensor is used to sense the number of rotations of the sensing plate and is signal-connected to the motor.

[0008] In one of the technical solutions, the sensing plate includes a clamping base and a sensing plate body that are fixedly connected. The outer edge of the sensing plate body is provided with a notch. The clamping base is clamped on the outer wall of the screwdriver. The sensor is disposed on the rotation path of the notch. The sensor is used to determine the number of rotations of the sensing plate by sensing the number of times the notch passes through it.

[0009] In one of the technical solutions, a linear bearing is fixed on the base, the screwdriver is inserted longitudinally through the linear bearing, and a coupling connects the motor and the screwdriver.

[0010] In one of the technical solutions, a pull rod is connected between the driver and the slide, and an elastic element is sleeved on the pull rod. The slide has a tendency to move downward relative to the pull rod due to the elastic force of the elastic element.

[0011] In one of the technical solutions, the driver is a cylinder, the cylinder body is fixed on the base, and the piston rod of the cylinder is fixedly connected to the top end of the pull rod.

[0012] In one of the technical solutions, the locking module further includes an air seat, which is sleeved on the screwdriver and rotatably connected to the screwdriver. The screwdriver has a downward-through negative pressure channel, and the outer wall of the air seat has a vacuum hole that communicates with the negative pressure channel.

[0013] In one of the technical solutions, the locking mechanism further includes a three-axis module, which is connected to the base and used to drive the base to move.

[0014] In one of the technical solutions, a guide rail is fixed on the base, the guide rail extends longitudinally, a slider is slidably connected to the guide rail, and the slider is fixedly connected to the slide block.

[0015] Compared with the prior art, the locking mechanism for pre-tightening provided by this utility model has at least the following beneficial effects:

[0016] During operation, the screwdriver of the fastening module attracts the screw. After the fastening module moves above the workpiece, the driver drives the fastening module to descend, causing the screw held by the screwdriver to contact the threaded hole of the workpiece. Then, the driver drives the screwdriver to rotate, screwing the screw into the workpiece. When the sensor detects that the sensing plate has rotated to a specified number of turns, the motor automatically stops rotating. This solution utilizes a combination of sensor and sensing plate to enable the screw to be screwed onto the workpiece to a specified number of turns. In fact, the screw is in a pre-tightened state at this time. In addition, since the sensing plate is fixed to the screwdriver by clamping, the clamping position of the sensing plate is easy to adjust in the vertical direction to allow the sensor to accurately detect the sensing plate. Moreover, the rotation posture of the sensing plate clamped on the screwdriver is also easy to adjust, thus facilitating the control of the final posture of the screw after rotating to a specified number of turns. For example, the final posture of the screw after rotating to a specified number of turns is that one side of the screw head is parallel to a specified plane of the workpiece. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a locking mechanism for pre-tightening provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of the locking mechanism for pre-tightening provided in an embodiment of this application from another angle;

[0020] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle.

[0021] Figure label:

[0022] 1. Base; 11. Guide rail; 12. Slider; 13. Linear bearing; 2. Locking module; 21. Slide block; 22. Motor; 23. Screwdriver; 231. Negative pressure channel; 24. Sensor; 25. Sensor plate; 251. Clamping seat; 252. Sensor plate body; 2521. Notch; 26. Coupling; 27. Air seat; 271. Vacuum hole; 3. Driver; 4. Pull rod; 5. Elastic element. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] 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 application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] 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 embodiments.

[0028] Please refer to the following: Figures 1 to 3 This utility model provides a locking mechanism for pre-tightening, which mainly includes a base 1, a locking module 2, and a driver 3. The driver 3 is fixed on the base 1 and is also connected to the locking module 2 to drive the entire locking module 2 to move up and down longitudinally. The locking module 2 specifically includes a slide 21, a motor 22, a screwdriver 23, a sensor 24, and a sensing plate 25. The slide 21 is connected to the driver 3, and the driver 3 drives the entire locking module 2 to move up and down by driving the slide 21. The slide 21 is slidably connected to the base 1 longitudinally to improve the accuracy of the entire locking module 2's up and down movement. Preferably, a guide rail 11 is fixed on the base 1, extending longitudinally, and a slider 12 is slidably connected to the guide rail 11. The slide 21 is fixedly connected to the slider 12, thereby achieving the purpose of sliding the slide 21 and the base 1 longitudinally. The motor 22 is fixed to the slide 21. The motor 22 is connected to the screwdriver 23 and drives the screwdriver 23 to rotate. The screwdriver 23 has a downward-through negative pressure channel 231, which is used to attract screws. The sensor 24 is fixed to the bottom of the slide 21. The sensing plate 25 is sleeved on the screwdriver 23 and clamps the screwdriver 23. That is, the sensing plate 25 rotates with the screwdriver 23. The sensor 24 is used to sense the number of rotations of the sensing plate 25. The sensor 24 is also connected to the motor 22 for signal transmission.

[0029] Specifically, during operation, the screwdriver 23 of the fastening module 2 attracts the screw. After the fastening module 2 moves above the workpiece, the driver 3 drives the fastening module 2 to descend, causing the screw attracted by the screwdriver 23 to contact the threaded hole of the workpiece. Then, the driver 3 drives the screwdriver 23 to rotate, screwing the screw into the workpiece. When the sensor 24 detects that the sensing plate 25 has rotated to a specified number of revolutions, the motor 22 receives the signal from the sensor 24 and automatically stops rotating. This solution utilizes the combination of the sensor 24 and the sensing plate 25 to ensure that the screw rotates to a specified number of revolutions. When the screw is screwed onto the workpiece, it is actually in a pre-tightened state. In addition, since the sensing plate 25 of this solution is fixed to the screwdriver 23 by clamping, the clamping position of the sensing plate 25 is easy to adjust in the up and down direction so that the sensor 24 can accurately sense the sensing plate 25. Moreover, the rotation posture of the sensing plate 25 clamped on the screwdriver 23 is also easy to adjust, so as to control the final posture of the screw after rotating a specified number of times. For example, the final posture of the screw after rotating a specified number of times is that one side of the screw head is parallel to the specified plane of the workpiece.

[0030] Please see Figure 3 The sensing element 25 specifically includes a clamping base 251 and a sensing element body 252 that are separately and fixedly connected. A notch 2521 is provided on the outer edge of the sensing element body 252. The clamping base 251 is clamped onto the outer wall of the screwdriver 23. The aforementioned sensor 24 is positioned on the rotation path of the notch 2521. The sensor 24 is used to determine the number of rotations of the sensing element 25 by sensing the number of times the notch 2521 passes through it. By designing the sensing element 25 as two separate components, it has the advantage of lower manufacturing cost. In actual installation, both the clamping base 251 and the sensing element body 252 need to be pre-mounted on the screwdriver 23. Then, the clamping base 251 is first clamped onto the outer wall of the screwdriver 23, and finally, the sensing element body 252 is locked onto the clamping base 251.

[0031] Please see Figure 1 or Figure 2 In this embodiment, a linear bearing 13 is fixed on the base 1, and the screwdriver 23 is longitudinally inserted into this linear bearing 13 to achieve a longitudinal sliding connection between the screwdriver 23 and the base 1, thereby improving the positional accuracy of the screwdriver 23's vertical movement. In low-speed applications, the linear bearing 13 will not hinder the rotational movement of the screwdriver 23. To avoid the screwdriver 23 and the motor 22 from jamming due to errors in their central shafts, this embodiment connects a coupling 26 between the output shafts of the screwdriver 23 and the motor 22.

[0032] Please see Figure 1A pull rod 4 connects the driver 3 and the slide 21. An elastic element 5 is sleeved on the pull rod 4. The slide 21, subjected to the elastic force of this elastic element 5, tends to move downwards relative to the pull rod 4. This elastic element 5 is preferably a spring. By providing this elastic element 5, the screw can elastically contact the locked workpiece downwards, preventing hard collisions between the screw and the locked workpiece that could damage the surface of the locked workpiece or the screw. Furthermore, this elastic element 5 also ensures that the screw is always subjected to a downward force during the tightening process, thereby allowing the screw to reliably screw downwards into the locked workpiece. Preferably, the driver 3 in this embodiment uses a low-cost cylinder. The cylinder body is preferably fixed to the base 1, and the piston rod of the cylinder is preferably fixedly connected to the aforementioned pull rod 4.

[0033] Please see Figure 1 The locking module 2 also includes an air seat 27, which is fitted onto the screwdriver 23 and rotatably connected to it. The outer wall of the air seat 27 has a vacuum hole 271 connected to a negative pressure channel 231 of the screwdriver 23. By evacuating air from the vacuum hole 271, the screwdriver 23 can reliably hold the screw, ensuring that the screwdriver 23 can reliably drive the screw to be screwed into the designated workpiece when it rotates. Because the air seat 27 and the screwdriver 23 are rotatably connected, the air seat 27 does not rotate with the screwdriver 23 when it rotates, thus avoiding entanglement of the air tube connected to the air seat 27.

[0034] In this embodiment, the fastening mechanism further includes a three-axis module. The three-axis module is connected to the base 1 and is used to drive the base 1 to move in three axes. The three-axis module can be understood as including an X-axis module, a Y-axis module and a Z-axis module connected in sequence. By setting the three-axis module, the screwdriver 23 can move in the X, Y and Z directions, thereby enabling the fastening mechanism to complete the automatic fastening of screws in multiple positions.

[0035] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A locking mechanism for pre-tightening, characterized in that, Includes base, latching module and driver; The driver is fixed to the base and connected to the locking module, and the driver is used to drive the locking module to move longitudinally. The locking module includes a slide, a motor, a screwdriver, a sensor, and a sensing plate. The slide is slidably connected to the base in the longitudinal direction. The slide is connected to the driver. The motor is fixed on the slide and connected to the screwdriver to drive the screwdriver to rotate. The screwdriver has a downward-through negative pressure channel for adsorbing screws. The sensor is fixed on the slide, and the sensing plate is clamped on the screwdriver. The sensor is used to sense the number of rotations of the sensing plate and is signal-connected to the motor.

2. The locking mechanism for pre-tightening as described in claim 1, characterized in that, The sensing plate includes a clamping base and a sensing plate body that are fixedly connected. The outer edge of the sensing plate body is provided with a notch. The clamping base is clamped on the outer wall of the screwdriver. The sensor is disposed on the rotation path of the notch. The sensor is used to determine the number of rotations of the sensing plate by sensing the number of times the notch passes through it.

3. The locking mechanism for pre-tightening as described in claim 1, characterized in that, A linear bearing is fixed on the base, and the screwdriver is inserted longitudinally through the linear bearing. A coupling connects the motor and the screwdriver.

4. The locking mechanism for pre-tightening as described in claim 1, characterized in that, A pull rod is connected between the driver and the slide, and an elastic element is sleeved on the pull rod. The slide has a tendency to move downward relative to the pull rod due to the elastic force of the elastic element.

5. The locking mechanism for pre-tightening as described in claim 4, characterized in that, The actuator is a cylinder, the cylinder body is fixed on the base, and the piston rod of the cylinder is fixedly connected to the top end of the pull rod.

6. The locking mechanism for pre-tightening as described in claim 1, characterized in that, The locking module also includes an air seat, which is sleeved on the screwdriver and rotatably connected to the screwdriver. The outer wall of the air seat is provided with a vacuum hole that communicates with the negative pressure channel.

7. The locking mechanism for pre-tightening as described in claim 1, characterized in that, The locking mechanism also includes a three-axis module, which is connected to the base and used to drive the base to move.

8. The locking mechanism for pre-tightening as described in claim 1, characterized in that, A guide rail is fixed on the base, the guide rail extends longitudinally, and a slider is slidably connected to the guide rail. The slider is fixedly connected to the slider.

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