Automatic tightening gun

Abstract

The utility model belongs to the technical field of automobile manufacturing, and discloses an automatic tightening gun which comprises a main body frame, a tightening shaft, a first sleeve and a double-rod double-acting air cylinder, the tightening shaft is installed in the main body frame, the first sleeve is installed at one end of the tightening shaft, and the double-rod double-acting air cylinder is installed on the same surface of the tightening shaft on the main body frame. The output end is connected with a sliding seat, a rotating air cylinder is installed on one surface of the sliding seat, a second sleeve is installed at the output end of the rotating air cylinder, and the second sleeve and the first sleeve are coaxially and oppositely arranged and used for grabbing and tightening nuts. According to the utility model, the automatic tightening gun is mounted in the gripper, the tightening gun can be moved to a nail taking station through the gripper during nail taking, and then the automatic tightening gun performs low-speed reverse rotation for nail taking through the tightening shaft and the rotating cylinder, so that the automatic nail taking process is realized, manual work is replaced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile manufacturing, and particularly relates to an automatic tightening gun. Background Art

[0002] There are a large number of bolts tightened manually in the assembly of the automobile chassis subassembly production line, which greatly consumes a lot of manpower. Moreover, when people work for a long time, they will always bear the internal force generated when tightening bolts and nuts, resulting in occupational diseases.

[0003] At present, in the assembly process of chassis bolts and nuts, there are mainly two conventional implementation methods: manual tightening and semi-automatic tightening. In manual tightening, one person holds two tools, one for preventing the rotation of the nut and the other for tightening the bolt; in semi-automatic tightening, the bolt and nut are first assembled onto the workpiece, and then the final tightening mechanism is used for tightening. In these two methods, it is too difficult for one person to operate two tools, which is not conducive to controlling the overall tightening quality. If two robots are used for subassembly, there are also great limitations in the operation space and cost. Summary of the Utility Model

[0004] In order to solve at least one problem in the background art, the utility model provides an automatic tightening gun.

[0005] In order to achieve the above object, the utility model adopts the following technical solutions:

[0006] An automatic tightening gun, comprising:

[0007] A main body frame, on which a tightening shaft is installed;

[0008] One end of the tightening shaft is provided with a first sleeve for grasping and tightening bolts;

[0009] A double-rod double-acting cylinder is installed on the same surface of the tightening shaft on the main body frame, and its output end is connected with a sliding seat;

[0010] A rotary cylinder is installed on one surface of the sliding seat;

[0011] The output end of the rotary cylinder is provided with a second sleeve;

[0012] The second sleeve is coaxially and oppositely arranged with the first sleeve for grasping and tightening nuts.

[0013] Preferably, a protective cover is installed on one surface of the main body frame away from the first sleeve for covering the tightening shaft and the double-rod double-acting cylinder.

[0014] Preferably, the top surface of the main body frame is a gripper mounting surface for connecting with the gripper of the robot.

[0015] Preferably, a servo motor is built into the tightening shaft, and the servo motor is used to drive the tightening shaft to rotate.

[0016] Preferably, a spring is installed at one end of the double-rod double-acting cylinder away from the sliding seat, and the spring is sleeved on the output shaft of the double-rod double-acting cylinder.

[0017] Preferably, the sliding seat is an L-shaped seat. The horizontal section is connected to the output shaft of the double-rod double-acting cylinder, and the surface of the vertical section facing the first sleeve is used to install the rotary cylinder.

[0018] Preferably, a positioning cylinder is installed on one surface of the vertical section of the sliding seat away from the rotary cylinder;

[0019] The positioning cylinder and the rotary cylinder are eccentrically arranged;

[0020] The positioning cylinder is used to embed the output shaft into the rotary cylinder to position the rotary cylinder.

[0021] Preferably, a positioning block is installed on the side of the output end of the rotary cylinder, and the positioning block is used for the output shaft of the positioning cylinder to be embedded.

[0022] Preferably, a substrate is further connected to the bottom of the main body frame;

[0023] The substrate is in sliding fit with the sliding seat;

[0024] A valve island mounting surface is reserved on the bottom surface of the substrate.

[0025] Preferably, a vision component is installed at one end of the substrate.

[0026] Advantages of the present utility model:

[0027] 1. By installing the automatic tightening gun into the gripper, when picking up the nail, the tightening gun can be moved to the nail-picking station by the gripper, and then the automatic tightening gun reversely rotates at a low speed through the tightening shaft and the rotary cylinder to pick up the nail, realizing the automated nail-picking process, replacing manual labor and improving work efficiency;

[0028] 2. By moving the first sleeve and the second sleeve to the position of the tightening hole by the gripper, and then matching the bolt and the nut through the tightening gun and forward rotation, the automatic installation process is realized, and the position of the tightening hole can be positioned by the vision component, improving the tightening quality.

[0029] Other features and advantages of the present utility model will be described in the subsequent specification, and part of them will be obvious from the specification or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the specification and the drawings. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Shows a schematic structural view of an automatic tightening gun of the present invention;

[0032] Figure 2 Shows a schematic structural view of nail taking of the automatic tightening gun of the present invention;

[0033] Figure 3 Shows the present invention Figure 2 An enlarged view of region C.

[0034] In the figure: 1. Main body frame; 101. Mounting plate; 2. Tightening shaft; 3. Double-rod double-acting cylinder; 4. Spring; 5. Sliding seat; 6. Positioning cylinder; 7. Rotary cylinder; 701. Positioning block; 8. First sleeve; 9. Second sleeve; 10. Protective cover; 1001. Wire outlet; 11. Substrate; 12. Vision component. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0036] An automatic tightening gun, as Figure 1 shown, includes a main body frame 1, a bolt tightening part and a nut tightening part.

[0037] Furthermore, the main body frame 1 is a welded structure of the plates of the tightening gun. Its top is an inverted "concave" seat structure. Several mounting holes are provided on the surface of the "concave" seat structure as the gripper mounting surface A to connect with the gripper of the robot.

[0038] In addition, vertical support plates are welded to the left and right sides of the "concave" seat. A strip-shaped substrate 11 is welded to the inner side of the bottom of the vertical support plate. A vision component 12 is installed at the end of the substrate 11. At the same time, a valve island mounting surface B is reserved on the bottom surface of the substrate 11. The valve island mounting surface B provides an integrated object for the solenoid valves for air and various signals.

[0039] Furthermore, Figure 1 the bolt tightening module of Figure 1 includes a tightening shaft 2, a double-rod double-acting cylinder 3 and a first sleeve 8. The tightening shaft 2 is internally integrated with a servo motor, and the servo motor can drive the tightening shaft 2 to rotate. The tightening shaft 2 is installed through the recessed position of the "concave" seat structure, and a first sleeve 8 is installed at one end thereof. The first sleeve 8 can grab the bolt by reversing and apply torque to the bolt by forward rotation.

[0040] In addition, the double-rod double-acting cylinder 3 is installed on the same surface of the main body frame 1 as the tightening shaft 2, and a sliding seat 5 is connected to the output end. Moreover, a spring 4 is installed at one end of the double-rod double-acting cylinder 3 away from the sliding seat 5, and the spring 4 is sleeved on the output shaft of the double-rod double-acting cylinder 3. When the double-rod double-acting cylinder 3 works, it can control the sliding seat 5 to move axially.

[0041] It should be noted that a mounting plate 101 can be welded on the end face of the main body frame 1, and the double-rod acting cylinder 3 is connected to the mounting plate 101 by bolts.

[0042] Furthermore, a protective cover 10 is installed on one surface of the main body frame 1 away from the first sleeve 8. The protective cover 10 is used to cover the tightening shaft 2 and the double-rod double-acting cylinder 3. In addition, a wire outlet 1001 is opened on the upper surface of the protective cover 10 to facilitate the passage of wires.

[0043] Furthermore, Figure 1 in the nut tightening part of Figure 1 , a rotary cylinder 7 is installed on one surface of the sliding seat 5; a second sleeve 9 is installed at the output end of the rotary cylinder 7; the second sleeve 9 is coaxially and oppositely arranged with the first sleeve 8 and is used to grab and tighten the nut.

[0044] In addition, the sliding seat 5 is an L-shaped seat, which is slidably matched with the substrate 11. The horizontal section of the L-shaped seat is connected to the output shaft of the double-rod double-acting cylinder 3, and the surface of the vertical section facing the first sleeve 8 is used to install the rotary cylinder 7. Moreover, a positioning cylinder 6 is installed on one surface of the vertical section of the sliding seat 5 away from the rotary cylinder 7. The positioning cylinder 6 is eccentrically arranged with the rotary cylinder 7 and is used to embed the output shaft into the rotary cylinder 7 to position the rotary cylinder 7.

[0045] Furthermore, a positioning block 701 is installed on the side of the output end of the rotary cylinder 7, and the positioning block 701 is used for the output shaft of the positioning cylinder 6 to be embedded.

[0046] It should be noted that in Figure 1In it, the output end of the rotary cylinder 7 is a disc-shaped structure. A positioning block 701 is fixedly connected to the side surface of the disc-shaped structure. A positioning hole matching with the positioning cylinder 6 is provided on the positioning block 701. When positioning the rotary cylinder 7 is required, only the output shaft of the positioning cylinder 6 needs to be inserted into the positioning hole of the positioning block 701 to achieve positioning.

[0047] In the present utility model, the nut tightening part can replace the rotary cylinder 7 and the second sleeve 9 with a clamping cylinder and a connecting part, so as to realize the occasions where the installed bolts and nuts are not tightened and have small torque. In the present utility model, the tightening shaft 2 can also be replaced with a pneumatic type according to the working conditions. In the present utility model, the first sleeve 8 can also be changed from a fixed type to a floating type, and the double-rod double-acting cylinder 3, the spring 4, and the sliding seat 5 can be replaced with a servo variable pitch module, which can better realize the tightening of different bolt length working conditions and can be optionally replaced.

[0048] The following is based on Figure 1 the structure to illustrate the working process of the automatic tightening gun:

[0049] 1. When the front suspension or rear suspension of the vehicle is transported to the tightening station of the chassis subassembly (under the working condition that the bolts and nuts are not installed and not tightened), the robot carries the Figure 1 automatic tightening gun from the pre-tightening position and moves to the bolt picking position.

[0050] 2. The double-rod double-acting cylinder 3 extends, and the sliding seat 5 moves to the Figure 1 left side in it, the "C" - shaped area between the first sleeve 8 and the second sleeve 9 increases, and the spring 4 is in a compressed state. Then the tightening shaft 2 rotates reversely at a low speed to pick up the bolt, and then picks up the nut according to the reverse rotation of the rotary cylinder 7. After picking up is completed, it leaves the nail picking position.

[0051] 3. The rotary cylinder 7 continues to rotate to the limit position. At this time, the positioning hole of the positioning block 701 is coaxial with the output shaft of the positioning cylinder 6. Then the positioning cylinder 6 extends to position the rotary cylinder 7, and the rotary cylinder 7 is in a locked state at this time.

[0052] 4. Then the vision component 12 takes a photo to determine the position of the tightening hole (this step can be selected or discarded according to the working conditions: if the hole position accuracy is high, the photo-taking system can be removed; if the hole position accuracy is not high, the photo-taking system is retained;), then moves to the tightening position of the station. The double-rod double-acting cylinder 3 retracts, and the spring 4 changes from the compressed state to the stretched state, and at the same time takes into account the front and rear floating effects. Subsequently, the tightening shaft 2 starts to rotate forward at a low speed to search for the nut, and then the tightening shaft 2 starts to tighten. After tightening is completed, the double-rod double-acting cylinder 3 extends, the positioning cylinder 6 retracts, leaves the tightening position, and returns to the HOME position.

[0053] Such as Figure 2As shown, the conveying device on the left conveys the screw nuts to the box body, and then the box body conveys the nuts and screws to the nail-taking station at the C area position on the right. During the automatic nail-taking process, the bolts and nuts have been placed at the nail-taking station. When the first sleeve 8 and the second sleeve 9 move to the nail-taking position, the bolts and nuts can be clamped by reversing at a low speed. As Figure 3 shown, it is Figure 2 an enlarged view of the C area in, where above the screw position, the nut is located below, and the first sleeve 8 and the second sleeve 9 have moved to the nail-taking position for nail-taking.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic tightening gun, characterized in that: include: A main frame (1) is provided with a tightening shaft (2); A first sleeve (8) is installed at one end of the tightening shaft (2), and the first sleeve (8) is used to grasp and tighten the bolt; A double-rod double-acting cylinder (3) is mounted on the same surface of the tightening shaft (2) on the main frame (1), and the output end is connected to a sliding seat (5); A rotating cylinder (7) is mounted on one surface of the sliding seat (5); A second sleeve (9) is installed at the output end of the rotary cylinder (7); The second sleeve (9) is coaxial with the first sleeve (8) and arranged facing each other, and is used for grasping and tightening the nut.

2. An automatic tightening gun according to claim 1, characterized in that: A protective cover (10) is installed on a surface of the main frame (1) away from the first sleeve (8), and the protective cover (10) is used to cover the tightening shaft (2) and the double-rod double-acting cylinder (3).

3. The automatic tightening gun according to claim 1, characterized in that: The top surface of the main frame (1) is a gripper mounting surface, which is used to be connected to the gripper of the robot.

4. The automatic tightening gun according to claim 1, characterized in that: The tightening shaft (2) is internally provided with a servo motor, and the servo motor is used to drive the tightening shaft (2) to rotate.

5. The automatic tightening gun according to claim 1, characterized in that: A spring (4) is installed at one end of the double-rod double-acting cylinder (3) away from the sliding seat (5), and the spring (4) is sleeved on the output shaft of the double-rod double-acting cylinder (3).

6. The automatic tightening gun according to claim 1, characterized in that: The sliding seat (5) is an L-shaped seat, the horizontal section of which is connected to the output shaft of the double-rod double-acting cylinder (3), and the vertical section facing the surface of the first sleeve (8) is used to install the rotary cylinder (7).

7. An automatic tightening gun according to claim 6, characterized in that: A positioning cylinder (6) is installed on a surface of the vertical section of the sliding seat (5) away from the rotating cylinder (7); The positioning cylinder (6) and the rotating cylinder (7) are eccentrically arranged; The positioning cylinder (6) is used to embed the output shaft into the rotating cylinder (7) to position the rotating cylinder (7).

8. An automatic tightening gun according to claim 7, characterized in that: A positioning block (701) is installed on the side of the output end of the rotary cylinder (7), and the positioning block (701) is used to position the output shaft of the cylinder (6) for embedding.

9. An automatic tightening gun according to any one of claims 1 to 8, characterized in that: The bottom of the main frame (1) is also connected to a base plate (11); The base plate (11) is slidably matched with the sliding seat (5); The bottom surface of the base plate (11) is reserved with a valve island installation surface.

10. An automatic tightening gun according to claim 9, characterized in that: A visual component (12) is installed at one end of the substrate (11).

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