A vacuum suction type screw tightening device

Abstract

The application provides a vacuum adsorption type screw tightening device, which is used for relative staticity, no sliding friction between a sealing ring and other components of equipment, long-term work, and the sealing ring cannot be damaged due to abrasion, and the vacuum adsorption type screw tightening device cannot be unable to suck up the screw due to sealing failure. In addition, only the lower end of the tightening unit and the screw gun rod rotate, and the rotating part does not contact other parts of the screw tightening device and has no friction, so that the process torque monitoring of the screw tightening of the equipment is not disturbed by other factors, and the accuracy of the process torque value of the screw tightening obtained by monitoring is very high. When the device starts to tighten the screw, the screw is separated from the screw vacuum suction pipe, there is no active friction between the nut and the screw vacuum suction pipe, metal debris does not pollute the product, and the process torque monitoring of the screw tightening of the equipment is not affected. Therefore, the service life of the device provided by the application will be much higher than that of the relative existing tightening device.

Description

Technical Field

[0001] This invention relates to the field of fastener installation, and more particularly to a vacuum adsorption type screw tightening device. Background Technology

[0002] Currently, metric screws are being used to connect components in the assembly of new energy vehicle electronic products such as PEU (Power Control Unit) and 48V DC-DC converters. Tightening metric screws requires that the screw be perpendicular to the upper surface of the screw hole when it enters the hole. The mainstream method for tightening metric screws is to use vacuum suction to ensure that the metric screw is in a vertical position. Figure 1 As shown.

[0003] Furthermore, because vacuum suction guns offer better control over screw orientation compared to traditional three-prong screwdriver heads, they improve tightening quality and reduce scrap rates. This is particularly beneficial for high-priced electronic products in new energy vehicles, such as PEUs and 48V DC-DC converters, which require tightening a large number of screws per product. Therefore, using vacuum suction guns instead of three-prong screwdriver heads for tightening self-tapping screws offers significant advantages and considerable economic value.

[0004] like Figure 1 As shown, the components, including the screw tightening unit 01, fixing sleeve 02, transition sleeve 03, screw tightening gun head 04, and screw vacuum suction tube 05, are assembled together and sealed with sealing rings to form a perfectly sealed cavity. The only inlet to the cavity is at the end of the screw vacuum suction tube 05. An air tube is connected to the upper part of the cavity and a vacuum is drawn. The end of the screw vacuum suction tube 05 adheres to the nut of the screw 06 through vacuum adsorption, and the contour design of the end of the screw vacuum suction tube 05 ensures that the screw 06 remains vertical.

[0005] Another widely used vacuum adsorption type screw tightening device is such as Figure 2 As shown, the screw tightening unit 001 and the fixing sleeve 002 are installed on the equipment frame. The screw vacuum suction tube 006 is installed on the screw tightening unit 001 in the vertical direction through the spring 005 and the port retaining ring 008. The screw vacuum suction tube 006 and the screw tightening unit 001 are kept in synchronous rotation through the flat key 009. The flat key 009 is fixed on the screw tightening unit 001 and can slide up and down in the keyway of the screw vacuum suction tube 006, that is, the screw tightening unit 001 can slide up and down in the upper cavity of the screw vacuum suction tube 006.

[0006] like Figure 2As shown, the sealing ring 004 and the sealing ring 010 are installed on the screw vacuum suction pipe 006, and the sealing between the fixed sleeve 002 and the screw vacuum suction pipe 006 is completed through the sealing ring 004 and the sealing ring 010, and the sealing between the screw tightening unit 001 and the screw vacuum suction pipe 006 is formed through the interference fit between the sealing boss structure on the outer surface of the screw tightening unit 001 and the inner wall of the cavity of the screw vacuum suction pipe 006. The vacuum suction pipe is connected at the vacuum suction pipe interface 003 on the fixed sleeve 002, and the gas in the cavity of the screw vacuum suction pipe 006 is sucked away by the vacuum suction pipe through the air hole 010 at the vacuum suction pipe interface 003, and a vacuum environment is formed in the cavity of the screw vacuum suction pipe 006, and the lower end of the screw vacuum suction pipe 006 can adsorb the screw nut.

[0007] The existing vacuum adsorption type screw tightening device is used for tightening the screw, and the screw vacuum suction pipe 006 rotates synchronously with the screw tightening unit 001 under the action of the flat key 009, so that the friction between the surface of the lower end of the screw vacuum suction pipe 006 and the screw is avoided. However, the fixed sleeve 002 is fixed, and the sealing ring 004 and the sealing ring 010 rotate with the screw vacuum suction pipe 006. Thus, there is always sliding friction between the sealing ring 004 and the sealing ring 010 and the fixed sleeve 002, which can cause the following problems:

[0008] 1) The sealing ring is worn out, resulting in sealing failure, and thus the vacuum environment in the cavity of the screw vacuum suction pipe cannot be established, and the lower end of the screw vacuum suction pipe cannot adsorb the screw nut.

[0009] 2) The frictional resistance between the sealing ring and the screw tightening unit causes the screw tightening torque value detected by the sensor of the device to be inconsistent with the actual value, and thus the screw tightening process cannot be accurately monitored.

[0010] The above two problems repeatedly occur in the actual application of the existing vacuum adsorption type screw tightening device, and have a great impact on the normal production of the production line. Therefore, a vacuum adsorption type screw tightening device for improving the service life of the screw tightening device is needed. SUMMARY

[0011] The purpose of the present application is to provide a vacuum adsorption type screw tightening device, which can solve the problems in the prior art, such as the sealing failure caused by the wear of the sealing ring, the failure of the screw vacuum suction pipe to adsorb the screw nut due to the failure to establish a vacuum environment in the cavity of the screw vacuum suction pipe, and the inconsistency between the screw tightening torque value detected by the sensor of the device and the actual value due to the frictional resistance between the sealing ring and the screw tightening unit, and the failure to accurately monitor the screw tightening process.

[0012] In order to solve the above technical problems, the present application provides a vacuum adsorption type screw tightening device, which comprises a fixing mechanism, a screw tightening unit, a rotating mechanism and a screw vacuum suction pipe.

[0013] The fixing mechanism comprises a cavity space, and the screw tightening unit comprises a connecting part and a rotating part.

[0014] One end of the connecting part is arranged in the cavity space and rotationally connected with one end of the rotating part, the connecting part is fixedly connected with the inner wall of the cavity space, and the other end of the connecting part is exposed outside the fixing mechanism.

[0015] The rotating part and the rotating mechanism are both arranged in the cavity space and do not contact with the inner wall of the cavity space.

[0016] One end of the rotating mechanism is connected with the other end of the rotating part, the rotating part is used for driving the rotating mechanism to rotate, the other end of the rotating mechanism is arranged in the screw vacuum suction pipe and does not contact with the screw vacuum suction pipe, and the other end of the rotating mechanism is used for rotating and tightening a screw.

[0017] One end of the screw vacuum suction pipe is arranged in the cavity space and fixedly connected with the inner wall of the cavity space, and the other end of the screw vacuum suction pipe is used for adsorbing and fixing the screw.

[0018] Optionally, the fixing mechanism is a sleeve part, and the sleeve part comprises the cavity space.

[0019] The connecting part and the inner wall of the cavity space are sealingly connected through a first sealing element.

[0020] Optionally, a vacuum suction pipe interface is arranged on the sleeve part and used for vacuumizing the cavity space.

[0021] Optionally, the sleeve part comprises a fixing sleeve and a transition sleeve.

[0022] One end of the transition sleeve is arranged in the fixing sleeve and fixedly connected with the inner wall of the fixing sleeve, the other end of the connecting part is exposed outside the fixing sleeve, and the fixing sleeve and the internal space of the transition sleeve jointly form the cavity space.

[0023] One end of the connecting part is arranged in the fixing sleeve and fixedly connected with the inner wall of the fixing sleeve, the rotating part is arranged in the transition sleeve and does not contact with the inner wall of the transition sleeve.

[0024] One end of the rotating mechanism is arranged in the transition sleeve, one end of the screw vacuum suction pipe is connected with the transition sleeve, and the vacuum suction pipe interface is arranged on the fixing sleeve.

[0025] Optionally, a ring-shaped groove for ventilation is arranged on the transition sleeve at a position corresponding to the vacuum pipe, and a ventilation hole is arranged in the ring-shaped groove.

[0026] Optionally, the number of ventilation holes is multiple.

[0027] Optionally, second sealing members are arranged on both sides of the ring-shaped groove for sealing connection of the transition sleeve and the fixed sleeve.

[0028] Optionally, a fitting section is arranged at one end of the screw vacuum pipe, and the fitting section is arranged in the transition sleeve.

[0029] Optionally, the length of the fitting section along the extension direction of the screw vacuum pipe is greater than 40% of the length of the screw vacuum pipe.

[0030] Optionally, a pressing mechanism is arranged between one end of the screw vacuum pipe and the inner wall of the transition sleeve, and the screw vacuum pipe further comprises an adsorption section, the diameter of the adsorption section is smaller than the diameter of the fitting section, and a step surface is formed at the connection position of the adsorption section and the fitting section.

[0031] The pressing mechanism applies a pressure to the screw vacuum pipe along the extension direction of the screw vacuum pipe, and a threaded end cover is arranged between the step surface and the outer wall of the transition sleeve for cooperation with the pressing mechanism to fix the screw vacuum pipe.

[0032] Optionally, third sealing members are arranged between the step surface and the transition sleeve and the threaded end cover for sealing connection.

[0033] Optionally, the pressing mechanism is a spring.

[0034] Optionally, the first sealing member, the second sealing member, and the third sealing member are all sealing rings.

[0035] Optionally, the rotating mechanism and the rotating component are fixedly connected through a clamping assembly.

[0036] Optionally, the rotating mechanism is a screw tightening gun rod.

[0037] The vacuum adsorption type screw tightening device provided by the application has the following advantages: during work, the sealing ring and other components of the device are relatively static and have no sliding friction, and the sealing ring will not be damaged due to wear and tear after long-term work, so the vacuum adsorption type screw tightening device will not have the problem of being unable to suck up the screw due to sealing failure. In addition, only the lower end of the tightening unit and the screw gun rod will rotate, and the rotating part does not contact other parts of the screw tightening device and has no friction, so the process torque monitoring of the device on the screw tightening process is not disturbed by other factors, and the accuracy of the screw tightening process torque value obtained by monitoring is very high. When the device starts to tighten the screw, the screw is separated from the screw vacuum suction pipe, so there is no active friction between the nut and the screw vacuum suction pipe, and metal debris will not pollute the product and will not affect the process torque monitoring of the device on the screw tightening. Therefore, the service life of the device provided by the application will be much longer than that of the existing vacuum adsorption type screw tightening device. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A schematic diagram of a screw tightening device for sucking up a screw;

[0039] Figure 2 A schematic diagram of a vacuum adsorption type screw tightening device in the prior art;

[0040] Figure 3 A schematic diagram of a vacuum adsorption type screw tightening device provided by an embodiment of the application;

[0041] Figure 4 A Figure 3 A partial enlarged schematic diagram of A in FIG. 1;

[0042] Figure 5 A Figure 3 A partial enlarged schematic diagram of B in FIG. 1;

[0043] Figure 6 A schematic diagram of a screw vacuum suction pipe in an embodiment of the application;

[0044] Figure 7 A schematic diagram of the state when the screw vacuum suction pipe in an embodiment of the application contacts a MASK clamp;

[0045] Among them, Figure 1 01-screw tightening unit, 02-fixed sleeve, 03-transition sleeve, 04-screw tightening gun head, 05-screw vacuum suction pipe, 06-screw;

[0046] Figure 2Middle: 001 - screw tightening unit, 002 - fixing sleeve, 003 - vacuum suction pipe interface, 004 - sealing ring, 005 - spring, 006 - screw vacuum suction pipe, 007 - screw tightening gun rod, 008 - port snap ring, 009 - flat key, 010 - sealing ring, 011 - vent hole, 012 - screw;

[0047] Figures 3 to 7 Middle: 1 - screw tightening unit, 2 - fixing sleeve, 3 - fixing screw hole, 4 - vacuum suction pipe interface, 5 - transition sleeve, 6 - screw tightening gun rod, 7 - threaded end cover, 8 - screw vacuum suction pipe, 9 - screw, 10 - sealing ring, 11 - sealing ring, 12 - vent hole, 13 - sealing ring, 14 - spring, 15 - sealing ring, 16 - annular groove, 17 - MASK clamp, 18 - product to be screwed. DETAILED DESCRIPTION

[0048] A vacuum suction type screw tightening device is further described in detail below in combination with the accompanying drawings and specific embodiments. The advantages and features of the present application will be more clearly understood from the following description taken in conjunction with the accompanying drawings and the claims. It should be noted that the drawings are in a very simplified form and are not drawn to precise scale, and are merely intended to facilitate, clarify and further set forth the present embodiments.

[0049] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or position shown in the drawings, and are merely used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] As Figures 3 to 7 shown, the present embodiment provides a vacuum suction type screw tightening device, which includes a fixing mechanism, a screw tightening unit 1, a rotating mechanism, and a screw vacuum suction pipe 8. The fixing mechanism includes a cavity space, and the screw tightening unit 1 includes a connecting part and a rotating part.

[0052] One end of the connecting component is arranged in the cavity space and rotationally connected with one end of the rotating component, the connecting component is fixedly connected with the inner wall of the cavity space, and the other end of the connecting component is exposed outside the fixing mechanism. The rotating component and the rotating mechanism are both arranged in the cavity space and do not contact the inner wall of the cavity space.

[0053] One end of the rotating mechanism is connected with the other end of the rotating component, and the rotating component is used to drive the rotating mechanism to rotate. The other end of the rotating mechanism is arranged in the screw vacuum suction pipe 8 and does not contact the screw vacuum suction pipe 8, and is used to rotate and tighten a screw 9.

[0054] One end of the screw vacuum suction pipe 8 is arranged in the cavity space and fixedly connected with the inner wall of the cavity space, and the other end of the screw vacuum suction pipe 8 is used to adsorb and fix the screw.

[0055] When vacuumizing the cavity space, air flows into the inside of the screw vacuum suction pipe 8 through the screw suction head at the lower end of the screw vacuum suction pipe 8, then air flows into the cavity space through the inside space of the screw vacuum suction pipe 8, and then is discharged through the upper part of the fixing mechanism. At this time, the end of the screw vacuum suction pipe 8 holds the screw to be tightened, the whole device moves downward, when the screw just enters the screw hole of the product, the power equipment (such as a motor) in the connecting component in the screw tightening unit 1 starts to drive the rotating component to rotate, the rotating component drives the rotating mechanism, the rotating mechanism drives the screw to rotate, and the screw starts to be tightened. At the same time, the part of the whole device except the screw vacuum suction pipe 8 continues to move downward. Since the screw vacuum suction pipe 8 does not move downward, the screw starts to gradually separate from the end of the screw vacuum suction pipe 8, at this time, since the screw tightening process has started, the screw can still maintain an upright posture after separating from the screw vacuum suction pipe 8, and the screw continues to be tightened until completion.

[0056] Optionally, the fixing mechanism can be a sleeve component, the sleeve component includes the cavity space, and the connecting component and the inner wall of the cavity space are sealingly connected through a first sealing member.

[0057] Optionally, a vacuum suction pipe interface 4 used for vacuumizing the cavity space is arranged on the sleeve component.

[0058] Optionally, the sleeve component can be an integral structure or composed of two structures, the sleeve component can further include a fixing sleeve 2 and a transition sleeve 5, one end of the transition sleeve 5 is arranged in the fixing sleeve 2 and fixedly connected with the inner wall of the fixing sleeve 2, and the inside space of the fixing sleeve 2 and the inside space of the transition sleeve 5 jointly constitute the cavity space.

[0059] One end of the connecting part is arranged in the fixing sleeve 2 and fixedly connected with the inner wall of the fixing sleeve 2, and the rotating part is arranged in the transition sleeve 5 and not in contact with the inner wall of the transition sleeve 5.

[0060] One end of the rotating mechanism is arranged in the transition sleeve 5, one end of the screw vacuum suction pipe 8 is connected with the transition sleeve 5, and the vacuum suction pipe interface 4 is arranged on the fixing sleeve 2.

[0061] It should be noted that the embodiment provides a connecting mode of the fixing sleeve 2 and the transition sleeve, but is not limited to this connecting mode, and there are many other types of connecting modes, which are not enumerated here.

[0062] Optionally, an annular groove 16 for ventilation can be arranged on the transition sleeve 5 at a position corresponding to the vacuum suction pipe, and a ventilation hole 12 can be further arranged in the annular groove 16.

[0063] Optionally, the number of the ventilation holes 12 can be multiple, and it should be noted that the number of the ventilation holes 12 is not limited, and generally 6-10 ventilation holes 12 can be arranged, which is selected according to specific conditions.

[0064] Optionally, second sealing parts can be arranged on both sides of the annular groove 16 for sealing connection of the transition sleeve 5 and the fixing sleeve 2.

[0065] Optionally, one end of the screw vacuum suction pipe 8 can be provided with a matching section, and the matching section is arranged in the transition sleeve 5.

[0066] Optionally, a pressing mechanism can be arranged between one end of the screw vacuum suction pipe 8 and the inner wall of the transition sleeve 5, and the screw vacuum suction pipe 8 can further include an adsorption section, the diameter of the adsorption section is smaller than the diameter of the matching section, and a stepped surface is formed at the connection position of the adsorption section and the matching section, as shown in Figure 6

[0067] The pressing mechanism exerts a pressure on the screw vacuum suction pipe 8 along the extension direction of the screw vacuum suction pipe 8, a threaded end cover 7 is arranged between the stepped surface and the outer wall of the transition sleeve 5 for cooperation with the pressing mechanism to fix the screw vacuum suction pipe 8. It should be noted that at this time, the outer wall of the transition sleeve 5 should be provided with threads so that the threaded end cover 7 can be screwed on the transition sleeve 5.

[0068] Optionally, third sealing parts are arranged between the stepped surface and the transition sleeve 5 and the threaded end cover 7 for sealing connection.

[0069] ​Optionally, the pressing mechanism can be a spring 14. It should be noted that the pressing mechanism can be other mechanisms in addition to the spring 14, which is not limited herein.

[0070] Optionally, the first seal, the second seal, and the third seal are all sealing rings. It should be noted that the use of the sealing ring in the embodiment is only a preferred solution, and the sealing ring can achieve better sealing effect. Of course, it is not limited to the use of the sealing ring. Other types of sealing rings can also be used, or a free combination of multiple sealing rings can be used, and appropriate sealing rings can be selected according to actual needs, which is not limited herein.

[0071] Optionally, the rotating mechanism and the rotating part are fixedly connected through a clamping assembly.

[0072] Optionally, the rotating mechanism is a screw tightening gun rod 6.

[0073] The embodiment provides a vacuum adsorption type screw tightening device. Figures 3 to 6 As shown in the figure, the upper end of the screw tightening unit 1 is fixedly connected with the part of the fixed sleeve 2 in contact, and the lower end of the screw tightening unit 1 is rotatable in the part inside the transition sleeve 5. A part that can drive the lower end to rotate is arranged at the connecting position of the upper end and the lower end of the screw tightening unit 1, for example, a motor can be arranged at the upper end to drive the lower end to rotate. The upper end here is the connecting part, and the lower end here is the rotating part.

[0074] The transition sleeve 5 is fixed on the fixed sleeve 2 through the fixing screw at the fixing screw hole 3. In order to ensure that the transition sleeve 5 is stably fixed on the fixed sleeve 2, three screw fixing structures are arranged between the fixed sleeve 2 and the transition sleeve 5.

[0075] The upper end cylinder a of the screw vacuum suction pipe 8 is located in the cylindrical cavity at the lower end of the transition sleeve 5. In order to ensure the coaxiality between the screw vacuum suction pipe 8 and the transition sleeve 5, avoid the screw vacuum suction pipe 8 from shaking after being installed in the transition sleeve 5, and ensure that the upper end cylinder a of the screw vacuum suction pipe 8 can freely slide up and down in the cylindrical cavity at the lower end of the transition sleeve 5, a transition fit is used between the screw vacuum suction pipe 8 and the transition sleeve 5, and the length of the fit surface (i.e. the length of the upper end cylinder a of the screw vacuum suction pipe 8) is not less than 40% of the length of the screw vacuum suction pipe 8. The length of the fit surface needs to be selected according to the actual situation.

[0076] The upper end face of the screw vacuum suction pipe 8 interacts with the transition sleeve 5 through the spring 14, which is in a compressed state and always presses the screw vacuum suction pipe 8 downward. The threaded end cap 7 is tightly fixed on the threads at the lower end of the transition sleeve 5, and the threaded end cap 7 limits the position of the upper end cylinder a of the screw vacuum suction pipe 8 in the cylindrical cavity at the lower end of the transition sleeve 5 through the stepped face b supporting the screw vacuum suction pipe 8.

[0077] The screw tightening gun rod 6 is fixed at the lower end of the screw tightening unit 1 through the clamping assembly on the screw tightening unit 1, and the screw tightening gun rod 6 rotates synchronously with the lower end of the screw tightening unit 1.

[0078] The transition sleeve 5 and the screw vacuum suction pipe 8 are not physically connected to the rotating part at the lower end of the screw tightening unit 1 and do not rotate with the lower end of the screw tightening unit 1.

[0079] The gap between the screw tightening unit 1 and the fixed sleeve 2 is sealed by the sealing ring 10, and the screw tightening unit 1, the fixed sleeve 2, and the sealing ring 10 are relatively static during the entire screw tightening process without sliding friction, so that the sealing ring 10 will not be damaged and the screw gun torque monitoring will not be affected during long-term work.

[0080] The sealing ring 11 and the sealing ring 13 are located at the upper and lower ends of the air hole 12 on the transition sleeve, respectively, to seal the gap between the fixed sleeve 2 and the transition sleeve 5, and the fixed sleeve 2, the transition sleeve 5, the sealing ring 11, and the sealing ring 13 are relatively static during the entire screw tightening process without sliding friction, so that the sealing ring 11 and the sealing ring 13 will not be damaged and the screw gun torque monitoring will not be affected during long-term work.

[0081] The transition sleeve 5 and the screw vacuum suction pipe 8 have a transition fit between the mating surfaces and a very long mating surface, so that the gas leaked from the gap between the two is very limited; at the same time, the transition sleeve 5 and the threaded end cap 7 can be effectively sealed by threads; when the screw vacuum suction pipe 8 needs to adsorb the screw, the stepped face b of the screw vacuum suction pipe 8 is tightly pressed on the threaded end cap 7, so that the sealing between the two is very good. Therefore, the sealing performance between the transition sleeve 5, the screw vacuum suction pipe 8, and the threaded end cap 7 can meet the use requirements even without using a sealing ring, but in order to further ensure the sealing performance of the device, a sealing ring 15 is used to seal between the transition sleeve 5, the screw vacuum suction pipe 8, and the threaded end cap 7.

[0082] In this way, a sealed cavity is formed inside the device of the present application, the vacuum suction pipe interface 4 is the only outlet for air flow, and the screw suction head at the lower end of the screw vacuum suction pipe 8 is the only inlet for air flow.

[0083] In addition, the outer surface of the transition sleeve 5 at the same height as the vacuum suction pipe interface 4 has a ring-shaped air passage groove 16, and the air passage holes 12 are arranged in the ring-shaped air passage groove 16. The number of air passage holes 12 can be set to about 6-10.

[0084] When the vacuum suction pipe interface 4 is vacuumized, the air flow enters the cavity of the screw vacuum suction pipe 8 through the screw suction head at the lower end of the screw vacuum suction pipe 8, then enters the cavity of the transition sleeve 5 through the cavity of the screw vacuum suction pipe 8, and then passes through the air passage holes 12 and the ring-shaped air passage groove 16 on the transition sleeve 5 to the vacuum suction pipe interface 4 to be vacuumized by the vacuum suction pipe. And the lower end of the screw vacuum suction pipe 8 can be designed by profiling, so that its contour can completely fit the screw cap. As shown in the figure, when the stepped surface c of the screw vacuum suction pipe 8 is pressed on the MASK clamp 17, the screw vacuum suction pipe 8 stops moving downward, and the end of the screw 9 just enters the screw hole of the product 18 to be screwed. At this time, the screw continues to move downward due to screwing, and even if it is separated from the screw vacuum suction pipe 8, it can still continue to maintain the vertical posture. Figure 7

[0085] The specific use process of the device provided in the embodiment is as follows:

[0086] First step: the end of the screw vacuum suction pipe 8 sucks the screw to be tightened, and the whole device moves downward.

[0087] Second step: when the stepped surface c of the screw vacuum suction pipe 8 is pressed on the MASK clamp 17, the screw vacuum suction pipe 8 stops moving downward, and the end of the screw 9 just enters the screw hole of the product, as shown in the figure. Figure 7

[0088] Third step: the screw tightening unit 1 starts to tighten the screw, and at the same time, the part of the device except the screw vacuum suction pipe 8 continues to move downward. At this time, the spring 14 is further compressed, the screw tightening gun rod 6 extends out of the screw vacuum suction pipe 8, the screw starts to separate from the end of the screw vacuum suction pipe 8, and the vacuum suction pipe stops vacuumizing. At this time, since the screw tightening process has started, the screw can still maintain the vertical posture after separating from the vacuum suction pipe 8.

[0089] Fourth step: the screw continues to tighten until completion, the screw tightening unit 1 stops working, and the device stops moving downward.

[0090] Fifth step: the device moves upward. The screw vacuum suction pipe 8 continues to press on the MASK clamp 17 under the action of the weight and the spring 14.

[0091] Sixth step: the device continues to move upward, and after the threaded end cover 7 supports the stepped surface b of the screw vacuum suction pipe 8, the screw vacuum suction pipe 8 separates from the MASK and moves upward with the device.

[0092] ​​Seventh step: the whole device returns to the initial position, and the screw tightening process is completed.

[0093] In summary, the vacuum adsorption type screw tightening device provided by the present application has the following advantages: during work, the sealing ring and other components of the device are relatively static and have no sliding friction, so the sealing ring will not be damaged due to wear and tear after long-term work, and thus the vacuum adsorption type screw tightening device will not have the problem of being unable to suck up the screw due to sealing failure. In addition, only the lower end of the tightening unit and the screw gun rod will rotate, and the rotating part does not contact other parts of the screw tightening device and has no friction, so the process torque monitoring of the device for screw tightening is not disturbed by other factors, and the accuracy of the screw tightening process torque value obtained by monitoring is very high. When the device starts to tighten the screw, the screw is separated from the screw vacuum suction pipe, so there is no active friction between the nut and the screw vacuum suction pipe, which will not pollute the product with metal debris and will not affect the process torque monitoring of the device for screw tightening. Therefore, the service life of the device provided by the present application will be much longer than that of the relative existing vacuum adsorption type screw tightening device.

[0094] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", or "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A vacuum adsorption type screw tightening device, characterized in that, Includes a fixing mechanism, a screw tightening unit, a rotating mechanism, and a screw vacuum suction tube; The fixing mechanism includes a cavity space, and the screw tightening unit includes a connecting component and a rotating component; One end of the connecting component is disposed within the cavity space and rotatably connected to one end of the rotating component. The connecting component is fixedly connected to the inner wall of the cavity space. The other end of the connecting component is exposed outside the fixing mechanism. The connecting component and the inner wall of the cavity space are sealed together by a first sealing element. Both the rotating component and the rotating mechanism are disposed within the cavity space and do not contact the inner wall of the cavity space; One end of the rotating mechanism is connected to the other end of the rotating component. The rotating component is used to drive the rotating mechanism to rotate. The other end of the rotating mechanism is located inside the screw vacuum suction tube and does not contact the screw vacuum suction tube. It is used to rotate and tighten a screw. One end of the screw vacuum suction tube is disposed inside the cavity space and is fitted with the inner wall of the cavity space using a transition fit. One end of the screw vacuum suction tube has a mating section. A clamping mechanism is provided between one end of the screw vacuum suction tube and the inner wall of the cavity space. The screw vacuum suction tube also includes an adsorption section. The diameter of the adsorption section is smaller than the diameter of the mating section. A stepped surface is formed at the connection between the adsorption section and the mating section. The clamping mechanism applies pressure to the screw vacuum suction tube along the extension direction of the screw vacuum suction tube. A threaded end cap is provided between the stepped surface and the outer wall of the fixing mechanism for cooperating with the clamping mechanism to fix the screw vacuum suction tube. The other end of the screw vacuum suction tube is used to adsorb and fix the screw. The fixing mechanism is a sleeve component, which includes the cavity space and a transition sleeve. The upper cylindrical part of the screw vacuum suction tube can slide freely up and down in the cylindrical cavity at the lower end of the transition sleeve. The mating section is disposed in the transition sleeve, and the length of the mating section along the extension direction of the screw vacuum suction tube is greater than 40% of the length of the screw vacuum suction tube. When a vacuum is drawn into the cavity, airflow enters the interior of the screw vacuum suction tube through the screw suction head at the lower end of the tube. The airflow then enters the cavity through the interior space of the suction tube and exits above the fixing mechanism. At this time, the end of the suction tube grips the screw to be tightened, and the entire device moves downwards. When the screw just enters the screw hole of the product, the power device located in the connecting component of the screw tightening unit begins to drive the rotating component to rotate. The rotating component drives the rotating mechanism, which in turn drives the screw to rotate. As the rotating mechanism drives the screw to rotate, the fixing mechanism, the tightening unit, and the rotating mechanism can continue to move downwards relative to the suction tube to tighten the screw.

2. The vacuum adsorption type screw tightening device as described in claim 1, characterized in that, The sleeve component is provided with a vacuum suction tube interface for evacuating the cavity space.

3. The vacuum adsorption type screw tightening device as described in claim 2, characterized in that, The sleeve component also includes a fixed sleeve; One end of the transition sleeve is disposed inside the fixed sleeve and is fixedly connected to the inner wall of the fixed sleeve, while the other end of the connecting component is exposed outside the fixed sleeve. The internal spaces of the fixed sleeve and the transition sleeve together constitute the cavity space. One end of the connecting component is disposed inside the fixed sleeve and is fixedly connected to the inner wall of the fixed sleeve; the rotating component is disposed inside the transition sleeve and does not contact the inner wall of the transition sleeve. One end of the rotating mechanism is disposed inside the transition sleeve; the vacuum suction tube interface is disposed on the fixed sleeve.

4. The vacuum adsorption type screw tightening device as described in claim 3, characterized in that, An annular groove for ventilation is provided on the transition sleeve at the position corresponding to the vacuum suction tube, and a ventilation hole is provided in the annular groove.

5. The vacuum adsorption type screw tightening device as described in claim 4, characterized in that, The number of vents is multiple.

6. The vacuum adsorption type screw tightening device as described in claim 4, characterized in that, The annular groove is provided with a second sealing element on both sides for sealing connection between the transition sleeve and the fixed sleeve.

7. The vacuum adsorption type screw tightening device as described in claim 1, characterized in that, The clamping mechanism is provided between one end of the screw vacuum suction tube and the inner wall of the transition sleeve; A threaded end cap is provided between the stepped surface and the outer wall of the transition sleeve to cooperate with the clamping mechanism to fix the screw vacuum suction tube.

8. The vacuum adsorption type screw tightening device as described in claim 7, characterized in that, A third sealing element is provided between the stepped surface, the transition sleeve, and the threaded end cap for sealing connection.

9. A vacuum adsorption type screw tightening device as described in claim 7, characterized in that, The clamping mechanism is a spring.

10. A vacuum adsorption type screw tightening device as described in claim 8, characterized in that, The first seal, the second seal, and the third seal are all sealing rings.

11. A vacuum adsorption type screw tightening device as described in claim 1, characterized in that, The rotating mechanism and the rotating component are fixedly connected by a clamping assembly.

12. The vacuum adsorption type screw tightening device as described in claim 1, characterized in that, The rotating mechanism is a screw-tightening mechanism for the gun bar.

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