Torsion attenuation prevention type tightening mechanism

Abstract

The utility model discloses an anti-torsion attenuation type tightening mechanism, and relates to the technical field of deep hole inclined tightening equipment, in particular to an automatic screw driving mechanism for automobile engine assembly, and particularly relates to the anti-torsion attenuation type tightening mechanism. The fixing frame structure serves as an assembly supporting structure of the torsion attenuation prevention type tightening mechanism and is fixedly installed on a robot arm. The automatic return floating mechanism is assembled on the fixed frame structure; the upper portion of the electric tightening shaft mechanism is vertically assembled on the fixing frame structure, and the lower portion of the electric tightening shaft mechanism is connected with the automatic return floating mechanism. The vacuum adsorption system is arranged on the electric tightening shaft mechanism, the outer side of the vacuum adsorption system is connected with an external vacuum generator, and the inner side of the vacuum adsorption system is communicated with the electric tightening shaft mechanism to provide vacuum adsorption force for the electric tightening shaft mechanism to suck screws. According to the technical scheme, the problems that in the prior art, a tightening sleeve is too large in floating amount and cannot enter a deep counter bore; the cap cannot be accurately screwed due to too small floating amount of the screwing sleeve; and torsion attenuation is easy to generate.

Description

Technical Field

[0001] The utility model discloses a torque attenuation-proof tightening mechanism, which relates to the technical field of deep hole inclined tightening equipment, in particular to an automatic screw-driving mechanism for assembling automobile engines, and in particular to a torque attenuation-proof tightening mechanism. Background Art

[0002] The degree of automation is getting higher and higher in the production line of engine assembly. Automatic screw driving machines are particularly common, but because the accuracy of threaded holes cannot be guaranteed during processing, the front end of common screw driving mechanisms is generally a floating mechanism. It is relatively easy to drive screws on the surface, but for deeper countersunk holes, the screws cannot be screwed in well. If the floating amount is too large, it cannot enter the countersunk hole well. If the floating amount is too small, it cannot be recognized well. Forcing the recognition of the cap to screw in will produce a reaction force, which will attenuate the force of screwing the screw and cannot meet the design requirements. Screwing in deep countersunk internal screws has always been an insurmountable obstacle in the field of screw driving. For example, the deep hole inclined tightening mechanism of the engine, because there is a thin and long sheath outside the screw, the ordinary screw driving mechanism cannot drive the screw in well, and it is easy to produce torque attenuation. Moreover, after the screw is screwed in, it is impossible to verify whether its torque is qualified, which brings certain hidden dangers to the production and manufacturing of the engine.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of anti-torque attenuation type tightening mechanism to overcome the problems existing in the prior art. Summary of the invention

[0004] According to the above technical problems that the floating amount of the tightening sleeve proposed in the prior art is too large to enter the deep countersunk hole; the floating amount of the tightening sleeve is too small to accurately confirm the cap; and torque attenuation is easy to occur, a torque attenuation-proof tightening mechanism is provided. The utility model mainly realizes the tightening of the deep countersunk hole without torque attenuation by setting an automatic return floating mechanism with a guide rail.

[0005] The technical means adopted by the utility model are as follows:

[0006] An anti-torque attenuation type tightening mechanism comprises: a fixing frame structure, an electric tightening shaft mechanism, an automatic return floating mechanism and a vacuum adsorption system;

[0007] Furthermore, the fixing frame structure is fixedly mounted on the robot arm as an assembly support structure of the anti-torque attenuation type tightening mechanism;

[0008] Furthermore, the automatic self-centering floating mechanism is assembled on the fixed frame structure;

[0009] Furthermore, the upper part of the electric tightening shaft mechanism is vertically mounted on the fixed frame structure, and the lower part is connected to the automatic return floating mechanism;

[0010] Furthermore, the vacuum adsorption system is arranged on the electric tightening shaft mechanism, the outer side is connected to the external vacuum generator, and the inner side is communicated with the electric tightening shaft mechanism, so as to provide vacuum adsorption force for the electric tightening shaft mechanism to absorb the screws.

[0011] Further, the fixing frame structure includes: a support and a connecting bracket;

[0012] Furthermore, the support and the connecting bracket are both L-shaped structures;

[0013] Furthermore, the connecting bracket is inverted and fixedly mounted on the bottom of the support;

[0014] Furthermore, the support and the horizontal plate of the connecting bracket are provided with through holes for assembling the electric tightening shaft mechanism;

[0015] Further, the support is fixedly mounted on the robot arm;

[0016] Furthermore, a linear guide rail is vertically mounted on the inner side of the vertical plate connecting the bracket.

[0017] Furthermore, the automatic return floating mechanism comprises: a slide table, a guide rail fixing screw, a connecting bracket, a linear guide rail and a slide table fastening screw;

[0018] Furthermore, the slide table is connected to the slider of the linear guide rail by means of a slide table fastening screw;

[0019] Furthermore, the linear guide rail is vertically assembled on the inner side of the connecting bracket through the guide rail fixing screws, so as to drive the slide table to slide freely in the axial direction under the action of the linear guide rail.

[0020] Further, the vacuum adsorption system includes: a ferrule-type air pipe joint and a sealing sleeve;

[0021] Furthermore, the sealing sleeve is embedded in the inner hole of the slide, and the lower end of the slide is assembled with the upper cover plate by screws, so that the sealing sleeve is firmly embedded in the slide;

[0022] Furthermore, a sealing threaded hole is provided on the side wall of the sealing sleeve, on which a ferrule-type air pipe joint is threadedly assembled;

[0023] Furthermore, the outer end of the ferrule-type air pipe joint is connected to the vacuum generator.

[0024] Furthermore, the electric tightening shaft mechanism comprises: a deep groove ball bearing, a self-made retaining ring, an elastic retaining ring, a tightening sleeve and an electric tightening shaft;

[0025] Furthermore, the electric tightening shaft is vertically fixedly assembled on the support, and its output end passes through the through holes on the support and the connecting bracket and is connected to the tightening sleeve;

[0026] Furthermore, the tightening sleeve is installed inside the sealing sleeve through deep groove ball bearings at the upper and lower ends; the inner ring of the deep groove ball bearing fits with the tightening sleeve, and the outer ring fits with the automatic self-centering floating mechanism;

[0027] Furthermore, a self-made retaining ring is arranged at the lower part of the deep groove ball bearing at the lower end between the tightening sleeve and the sealing sleeve; and an elastic retaining ring is arranged at the lower part of the self-made retaining ring for fixing the tightening sleeve and the sealing sleeve.

[0028] Further, the hollow portion of the tightening sleeve is completely sealed with the air inlet portion of the sealing sleeve;

[0029] Furthermore, a sealing ring with a hardness of 50° is arranged above and below the tightening sleeve to perform sealing.

[0030] Furthermore, there is a gap of 0.5 mm between the upper end of the sealing sleeve and the slide table;

[0031] Furthermore, there is a 0.5 mm gap on one side between the outer diameter of the sealing sleeve and the inner diameter of the slide table.

[0032] Furthermore, an O-ring with a hardness of 70° is provided above and below the sealing sleeve and the slide table;

[0033] Furthermore, the sealing sleeve is in a stationary state when not under stress due to the elasticity of the O-ring with a hardness of 70°.

[0034] The action process of the utility model is:

[0035] The tightening sleeve absorbs the screw from the feeder through vacuum adsorption, and the vacuum generator receives a signal to confirm that the screw has been adsorbed on the sleeve; the entire mechanism is moved by the robot to the top of the engine cylinder. After the secondary positioning of the engine cylinder, the tightening sleeve carries the screw into the sleeve of the engine cylinder. When the screw contacts the engine cylinder, the entire mechanism will slide backward along the guide rail direction. When it slides to the set position, the feeding stops. The electric tightening shaft begins to rotate forward and reverse to identify the cap. During the identification process, the entire sleeve is in an automatic return to the center floating state. The front end of the screw enters the threaded hole under the rotation of the tightening shaft and starts the tightening action. During this process, the tightening sleeve is always in an automatic return to the center floating state until the tightening shaft torque test is qualified. After the test is qualified, the entire mechanism withdraws and grabs the next screw according to the set route. Repeat the above actions.

[0036] Compared with the prior art, the utility model has the following advantages:

[0037] 1. The anti-torque attenuation type tightening mechanism provided by the utility model solves the problem that the existing device cannot reach the required torque for screw tightening due to uncontrollable floating. The torque of the device is almost not attenuated during the tightening process;

[0038] 2. The anti-torque attenuation tightening mechanism provided by the utility model solves the problem of difficulty in identifying the cap in deep countersunk holes;

[0039] 3. The anti-torque attenuation tightening mechanism provided by the utility model is flexible and convenient to use, simple to install, and compatible with a variety of installation methods;

[0040] 4. The anti-torque attenuation tightening mechanism provided by the utility model has low cost, convenient production, and is suitable for various tightening;

[0041] 5. The anti-torque attenuation type tightening mechanism provided by the utility model has a novel processing form, a simple and compact structure, simple and convenient operation, and improves productivity;

[0042] 6. The anti-torque attenuation type tightening mechanism provided by the utility model saves labor, saves money, and has a low failure rate.

[0043] In summary, the technical solution of the utility model solves the problems in the prior art that the floating amount of the tightening sleeve is too large to enter the deep countersunk hole; the floating amount of the tightening sleeve is too small to accurately confirm the cap; and torque attenuation is easily generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Attached Figure 1 This is the front view of the utility model;

[0046] Attached Figure 2 This is the axonometric drawing of the utility model;

[0047] Attached Figure 3 For attachment Figure 1 Left view of

[0048] Attached Figure 4 For attachment Figure 1 AA view;

[0049] Attached Figure 5 For attachment Figure 4 A magnified view of part I.

[0050] In the figure: 1, slide 2, deep groove ball bearing 3, 70° hardness O-ring 4, 50° hardness O-ring 5, ferrule type air pipe joint 6, homemade retaining ring 7, elastic retaining ring 8, tightening sleeve 9, cover plate fastening screws 10, cover plate 11, electric tightening shaft 12, fixing frame 13, guide rail fixing screws 14, connecting bracket 15, linear guide 16, slide table fastening screws 17, sealing sleeve. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0058] As shown in the figure, the utility model provides an anti-torque attenuation type tightening mechanism, an electric tightening shaft 11 is assembled and fixed on a fixing frame 12, one end of the fixing frame 12 is fixed on the robot arm, and the lower end is connected to the connecting bracket 14; the guide rail of the linear guide rail 15 is fastened to the connecting bracket 14 by the guide rail fixing screw 13; the slider of the linear guide rail 15 is fastened to the slide 1 by the slide fastening screw 16; the hexagonal structure at the upper end of the tightening sleeve 8 is connected to the docking port of the electric tightening shaft 11.

[0059] The sealing sleeve 17 is loaded with a 50° hardness O-ring 4 in the middle groove to play a sealing role. The deep groove ball bearings 2 are loaded at the upper and lower ends, and then the tightening sleeve 8 is inserted from the upper side. The lower end is fastened with a homemade gasket 6 and an elastic retaining ring 7 to become a part.

[0060] The O-ring 3 with a hardness of 70° is used for the automatic self-centering floating mechanism and plays a filling role; the O-rings 3 with a hardness of 70° are respectively installed in the grooves of the inner hole of the slide 1, and then the upper sealing sleeve 17 and the like are installed into the slide 1 from the lower end, and are pressed down at the lower end by the cover plate 10 and fastened with the cover plate fastening screws 9.

[0061] The ferrule-type air pipe joint 5 passes through the outer hole of the slide 1 and is screwed into the sealing sleeve 17.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A torque attenuation-proof tightening mechanism, characterized in that: The anti-torque attenuation type tightening mechanism comprises: a fixed frame structure, an electric tightening shaft mechanism, an automatic return floating mechanism and a vacuum adsorption system; The fixing frame structure is used as an assembly support structure of the anti-torque attenuation type tightening mechanism and is fixedly mounted on the robot arm; The automatic return floating mechanism is assembled on the fixed frame structure; The upper part of the electric tightening shaft mechanism is vertically mounted on the fixed frame structure, and the lower part is connected to the automatic return floating mechanism; The vacuum adsorption system is arranged on the electric tightening shaft mechanism, the outer side is connected to the external vacuum generator, and the inner side is communicated with the electric tightening shaft mechanism, so as to provide vacuum adsorption force for the electric tightening shaft mechanism to absorb screws.

2. The anti-torque attenuation type tightening mechanism according to claim 1, characterized in that: The fixing frame structure comprises: a support (12) and a connecting bracket (14); The support (12) and the connecting bracket (14) are both L-shaped structures; The connecting bracket (14) is inverted and fixedly mounted on the bottom of the support (12); The support (12) and the horizontal plate of the connecting bracket (14) are provided with through holes for assembling the electric tightening shaft mechanism; The support (12) is fixedly mounted on the robot arm; A linear guide rail (15) is vertically mounted on the inner side of the vertical plate of the connecting bracket (14).

3. The anti-torque attenuation type tightening mechanism according to claim 1, characterized in that: The automatic return floating mechanism comprises: a slide (1), a guide rail fixing screw (13), a connecting bracket (14), a linear guide rail (15) and a slide rail fastening screw (16); The slide table (1) is connected to the slider of the linear guide rail (15) by means of a slide table fastening screw (16); The linear guide rail (15) is vertically assembled on the inner side of the connecting bracket (14) through the guide rail fixing screw (13), so as to drive the slide table (1) to slide freely in the axial direction under the action of the linear guide rail (15).

4. The anti-torque attenuation type tightening mechanism according to claim 1, characterized in that: The vacuum adsorption system comprises: a ferrule-type air pipe joint (5) and a sealing sleeve (17); The sealing sleeve (17) is embedded in the inner hole of the slide (1), and the lower end of the slide (1) is assembled with the upper cover plate (10) by means of screws (9), so that the sealing sleeve (17) is firmly embedded in the slide (1); The side wall of the sealing sleeve (17) is provided with a sealing threaded hole, on which a ferrule-type air pipe connector (5) is threadedly mounted; The outer end of the ferrule-type air pipe joint (5) is connected to the vacuum generator.

5. The anti-torque attenuation type tightening mechanism according to claim 1, characterized in that: The electric tightening shaft mechanism comprises: a deep groove ball bearing (2), a self-made retaining ring (6), an elastic retaining ring (7), a tightening sleeve (8) and an electric tightening shaft (11); The electric tightening shaft (11) is vertically fixedly assembled on the support (12), and its output end passes through the through holes on the support (12) and the connecting bracket (14) and is connected to the tightening sleeve (8); The tightening sleeve (8) is installed inside the sealing sleeve (17) through the deep groove ball bearings (2) at the upper and lower ends; the inner ring of the deep groove ball bearing (2) fits with the tightening sleeve (8), and the outer ring fits with the automatic self-centering floating mechanism; A self-made retaining ring (6) is arranged below the deep groove ball bearing (2) at the lower end between the tightening sleeve (8) and the sealing sleeve (17); an elastic retaining ring (7) is arranged below the self-made retaining ring (6) for fixing the tightening sleeve (8) and the sealing sleeve (17).

6. The anti-torque attenuation type tightening mechanism according to claim 5, characterized in that: The hollow portion of the tightening sleeve (8) and the air inlet portion of the sealing sleeve (17) are completely sealed; A sealing ring (4) with a hardness of 50° is arranged above and below the tightening sleeve (8) and the sealing sleeve (17) to perform sealing.

7. The anti-torque attenuation type tightening mechanism according to claim 4, characterized in that: There is a gap of 0.5 mm between the upper end of the sealing sleeve (17) and the slide table (1); There is a 0.5 mm gap on one side between the outer diameter of the sealing sleeve (17) and the inner diameter of the slide table (1).

8. The anti-torque attenuation type tightening mechanism according to claim 4, characterized in that: An O-ring (3) with a hardness of 70° is disposed above and below the sealing sleeve (17) and the slide table (1); The sealing sleeve (17) is in a static state when not under stress due to the elasticity of the O-ring (3) with a hardness of 70°.

Images