Floating gun head for self-tapping tightening and assembling device

Abstract

The invention relates to a floating gun head for self-tapping tightening and an assembling device. The floating gun head for self-tapping tightening comprises a multi-tooth gun head body, a conversion connector, a floating adjusting assembly and a driving part. The conversion joint comprises a first end and a second end, and the first end is in floating connection with the multi-tooth gun head; one end of the floating adjusting assembly is connected with the multi-tooth gun head, the other end of the floating adjusting assembly is connected with the adapter, and the floating adjusting assembly is used for adjusting the pre-tightening force between the adapter and the multi-tooth gun head; the driving part is connected with the second end of the adapter and used for driving the adapter and the multi-tooth gun head to rotate. According to the floating gun head for self-tapping tightening, the floating amount of the multi-tooth gun head can be adjusted through the floating adjusting assembly so as to adapt to different station holes, and compared with the prior art, the universality of the floating gun head is improved.

Description

Technical Field

[0001] This disclosure relates to the field of assembly tool technology, and more specifically, to a floating gun head and assembly device for self-tapping tightening. Background Technology

[0002] Tightening is one of the core processes in the industrial manufacturing system. Self-extruding nuts are used in key fastening positions of large die-cast parts integrated with the body-in-white. The quality of the tightening process directly affects the quality of the entire product.

[0003] In related technologies, in order to better achieve vertical alignment with the parts, the tightening gun head has a certain amount of floating. However, the floating amount is fixed and cannot be adjusted. Parts produced by different molds have different dimensions. When the adjustment is made by adjusting the machining reference, the position of the self-tapping hole will change. Therefore, the tightening gun head cannot adapt to the changes in the size of the parts. Summary of the Invention

[0004] The purpose of this disclosure is to provide a floating gun head and assembly device for self-tapping screwing. The floating gun head for self-tapping screwing can adjust the floating amount of the multi-tooth gun head through a floating adjustment component to adapt to different workpiece holes, thereby improving the versatility of the floating gun head compared with related technologies.

[0005] To achieve the above objectives, according to a first aspect of this disclosure, a floating gun head for self-tapping tightening is provided, comprising: Multi-toothed gun head; A conversion connector; comprising a first end and a second end, wherein the first end is floatingly connected to the multi-tooth gun head; A floating adjustment assembly; sleeved on the adapter, one end connected to the multi-tooth gun head, the other end connected to the adapter, used to adjust the preload between the adapter and the multi-tooth gun head; and A driving component, connected to the second end of the adapter, is used to drive the adapter and the multi-tooth gun head to rotate.

[0006] Optionally, the floating adjustment assembly includes an elastic element and an elastic sleeve; The elastic element is sleeved on the adapter, with one end abutting against the multi-toothed gun head and the other end connected to the elastic sleeve. The elastic sleeve is circumferentially fitted onto the elastic element and is adjustablely connected to the adapter. By adjusting the connection position of the elastic sleeve on the adapter, the floating amount between the multi-toothed gun head and the adapter can be adjusted; or The elastic element is sleeved on the adapter, with one end of the elastic element abutting against the adapter and the other end connected to the elastic sleeve. The elastic sleeve is sleeved around the circumference of the elastic element, and the end of the elastic sleeve away from the drive unit abuts against the multi-tooth gun head. The elastic sleeve is positionally adjustable to the adapter to adjust the floating amount of the multi-tooth gun head and the adapter.

[0007] Optionally, the adapter includes a first external thread, and the elastic sleeve includes a first internal thread, wherein the first external thread is screwed into the first internal thread.

[0008] Optionally, the first end of the adapter has a first connector portion, and the multi-tooth gun head includes a second connector portion. The first connector portion and the second connector portion are connected by a first radial locking member so that the multi-tooth gun head can rotate synchronously with the adapter, and the multi-tooth gun head can deflect a preset angle relative to the central axis of the adapter.

[0009] Optionally, the first connector portion is configured as a square plug with a first radial pin hole, and the second connector portion is configured as a square groove with a second radial pin hole. The first radial locking member is constructed as a first pin, and the size of the first pin is smaller than the size of the second radial pin hole; The first pin hole is inserted into the first radial pin hole and the second radial pin hole for floating connection of the square plug and the square groove.

[0010] Optionally, the floating head for self-tapping tightening further includes a retaining ring, which is fitted around the circumference of the multi-toothed head and corresponds to the second radial pin hole, to prevent the first pin from coming out.

[0011] Optionally, the multi-tooth gun head includes a multi-tooth head and a guide rod located at the front end of the multi-tooth head; The multi-tooth gun head also includes a magnetic suction element surrounding the multi-tooth head and located at the rear end of the multi-tooth head.

[0012] Optionally, the adapter further includes a third connector portion located away from the first connector portion; The drive spindle of the drive component is provided with a fourth connector, and the third connector is connected to the fourth connector, so that the drive component can drive the conversion connector to rotate.

[0013] Optionally, one of the third connector portion and the fourth connector portion is constructed as a square plug, and the other is constructed as a square groove, wherein the square plug and the square groove are connected by a second radial locking member.

[0014] Optionally, the floating gun head for self-tapping tightening further includes a first mounting plate and a gun head mounting plate; The drive unit is connected to the first mounting plate, and the drive spindle of the drive unit is constructed as a telescopic spindle. The telescopic spindle passes through the first mounting plate and is connected to the conversion joint. The gun head mounting plate is also provided with a bearing mounting seat, and the adapter is rotatably connected to the bearing mounting seat through a first bearing; The floating gun head for self-tapping tightening also includes a clamping component, one end of which is connected to the first mounting plate and the other end of which is connected to the gun head mounting plate, to increase the self-tightening pressure.

[0015] Optionally, the clamping assembly includes a cylinder connected to the first mounting plate, the piston rod of the cylinder passing through the first mounting plate and connected to the gun head mounting plate; or The clamping assembly is constructed as an elastic clamping member sleeved on the telescopic spindle, with one end of the elastic clamping member connected to the first mounting plate and the other end connected to the gun head mounting plate.

[0016] Optionally, the inner ring of the first bearing is fixedly sleeved on the adapter, and one side of the first bearing abuts against the shoulder of the adapter, and the outer ring of the first bearing is used to connect with the bearing mounting base. The floating head for self-tapping tightening also includes a locking nut axially movably connected to the adapter, the locking nut abutting against the other side of the first bearing for axial locking of the first bearing.

[0017] Optionally, the floating gun head for self-tapping tightening further includes at least one guide component connected to the first mounting plate and the gun head mounting plate respectively, for guiding the gun head mounting plate when the clamping component drives the gun head mounting plate to move and drives the telescopic spindle of the drive member to extend and retract.

[0018] Optionally, the guide assembly includes a linear bearing and a guide shaft; The linear bearing is fixedly connected to the first mounting plate, one end of the guide shaft is connected to the gun head mounting plate, and the other end is slidably connected to the linear bearing.

[0019] According to a second aspect of this disclosure, an assembly apparatus is also provided, the assembly apparatus comprising at least one of the above-described floating gun heads for self-tapping tightening.

[0020] The self-tapping screwdriver head disclosed herein comprises a multi-toothed screwdriver head, an adapter, a floating adjustment assembly, and a drive component. The multi-toothed screwdriver head is floatingly connected to the first end of the adapter, the second end of the adapter is connected to the drive component, and the floating adjustment assembly is connected between the multi-toothed screwdriver head and the adapter to adjust the preload between them, thereby adjusting the floating amount of the multi-toothed screwdriver head. Therefore, the self-tapping screwdriver head disclosed herein can adjust the floating amount of the multi-toothed screwdriver head through the floating adjustment assembly to adapt to different hole positions, thus improving the versatility of the floating screwdriver head compared to related technologies.

[0021] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a structural diagram of a floating gun head for self-tapping tightening provided in some embodiments of this disclosure; Figure 2 This is a side view of a floating gun head for self-tapping tightening provided in some embodiments of this disclosure; Figure 3 Based on Figure 2 AA section view in the middle; Figure 4 This is a connection structure diagram of the multi-tooth gun head, adapter, and floating adjustment assembly provided in some embodiments of this disclosure; Figure 5 This is an exploded view of the multi-tooth gun head, adapter, and floating adjustment assembly provided in some embodiments of this disclosure; Figure 6 This is a side view of the connection of the multi-tooth gun head, adapter and floating adjustment assembly provided in some embodiments of this disclosure; Figure 7 This is a cross-sectional view from one direction showing the connection of the multi-tooth gun head, adapter, and floating adjustment assembly provided in some embodiments of this disclosure; Figure 8 This is a cross-sectional view from another direction showing the connection of the multi-tooth gun head, adapter, and floating adjustment assembly provided in some embodiments of this disclosure; Figure 9 This is a structural diagram of the adapter provided in some embodiments of this disclosure.

[0023] Explanation of reference numerals in the attached figures 100 - Multi-toothed gun head; 101 - Second connector; 1011 - Square groove; 102 - Second radial pin hole; 103 - First annular groove; 110 - Multi-toothed head; 120 - Guide rod; 130 - Magnetic suction element; 131 - Magnetic ring sleeve; 132 - Magnetic ring; 140 - Snap ring; 200 - Adapter; 210 - First connector; 2101 - Square plug; 211 - First radial pin hole; 212 - First pin; 220 - Third connector; 221 - Third radial pin hole; 222 - Second pin; 230 - First external thread; 240 - Shoulder; 250 - Elastic retaining ring; 260 - Second annular groove; 300 - Floating adjustment assembly; 310 - Elastic element; 320 - Elastic sleeve; 330 - Seal; 400 - Drive component; 410 - Drive spindle; 411 - Fourth connector; 412 - Fourth radial pin hole; 510 - First bearing; 520 - Locking nut; 610 - First mounting plate; 620 - Gun head mounting plate; 630 - Bearing mounting seat; 640 - Cylinder; 641 - Piston rod; 650 - Guide assembly; 651 - Linear bearing; 652 - Guide shaft. Detailed Implementation

[0024] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0025] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer contours of the corresponding components; "far" and "near" refer to the corresponding structure or component being away from or near another structure or component. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. Additionally, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0026] Tightening is a core component of the industrial manufacturing system. Self-extracting nuts are used in critical fastening positions of large die-cast parts integrated with the body-in-white. The quality of the tightening process directly affects the overall product quality. Typically, an operator takes a bolt tightening gun, goes to the workstation, locates the workpiece where the self-extracting nut needs to be tightened, manually attaches the self-extracting nut to the gun head, holds the gun in place, presses down firmly, and drives the gun. The tightening is complete only after a certain period of time.

[0027] Tightening self-extruding nuts requires high assembly precision. It is difficult for operators to keep the fastener perpendicular to the product. Too large or too small an angle will affect the product quality. This is especially true for tightening self-extruding nuts on the integrated large cast floor of the body-in-white. The parts are large and varied, and different tightening guns need to be changed multiple times, resulting in low production efficiency and safety hazards.

[0028] Therefore, through a survey of the current status of self-tapping tightening operations, it was found that the self-tapping tightening assembly equipment on the integrated large die-cast body parts assembly automated production line is difficult to operate, especially when the tightening torque reaches 200Nm or more. It is difficult to control the vertical tightening of the tightening gun head and the part, which leads to the failure and scrapping of the self-extrusion nut in the final assembly. If a robot carrying a tightening gun and equipped with a vision system is used, the problem of vertical tightening can be solved, but only one self-extrusion nut can be tightened at a time, and tightening after taking a picture each time will also reduce efficiency.

[0029] In related technologies, tightening guns with a certain amount of floating tightening are all threaded tightening guns with pre-machined thread guides, making floating control more convenient. While self-tapping tightening guns are currently used in the market, none of them have a floating function. Commercially available floating tightening guns have a fixed floating amount that cannot be adjusted. However, parts produced by different molds in integrated large die-casting processes exhibit dimensional variations. Adjusting these variations through machining references can lead to changes in the position of the self-tapping holes. Therefore, existing tightening guns cannot adapt to these variations and thus cannot meet the assembly requirements of the parts.

[0030] The tightening guns in related technologies have the following characteristics: they are threaded tightening guns with strong guidance. Self-tapping tightening in a relatively free state requires a higher level of floating function and strong vertical clamping force to achieve vertical tightening with the end face; the floating amount cannot be adjusted, and it cannot adapt to the size changes of integrated large die-cast parts; the structure is relatively complex, which is not conducive to maintenance and replacement; and it has no magnetic attraction function, which cannot prevent the self-extracting nut from falling off during installation.

[0031] Based on this, such as Figures 1 to 9 As shown, according to a first aspect of this disclosure, a floating head for self-tapping screwdrivers is provided. The floating head includes a multi-toothed head 100, a conversion connector 200, a floating adjustment assembly 300, and a drive member 400. The conversion connector 200 includes a first end and a second end. The first end is floatingly connected to the multi-toothed head 100. The floating adjustment assembly 300 is sleeved on the conversion connector 200, with one end connected to the multi-toothed head 100 and the other end connected to the conversion connector 200, for adjusting the preload between the conversion connector 200 and the multi-toothed head 100. The drive member 400 is connected to the second end of the conversion connector 200 for driving the conversion connector 200 and the multi-toothed head 100 to rotate.

[0032] The floating gun head for self-tapping screwing disclosed herein, through the above technical solution, includes a multi-tooth gun head 100, a conversion connector 200, a floating adjustment component 300, and a drive component 400. The multi-tooth gun head 100 is floatingly connected to the first end of the conversion connector 200, the second end of the conversion connector 200 is connected to the drive component 400, and the floating adjustment component 300 is connected between the multi-tooth gun head 100 and the conversion connector 200 to adjust the preload between them, thereby adjusting the floating amount of the multi-tooth gun head 100. Therefore, the floating gun head for self-tapping screwing disclosed herein can adjust the floating amount of the multi-tooth gun head 100 through the floating adjustment component 300 to adapt to different workpiece holes, improving the versatility of the floating gun head compared to related technologies.

[0033] The drive unit 400 can be a tightening gun, which can drive the adapter 200 and the multi-tooth gun head 100 to rotate in order to achieve the tightening operation.

[0034] It is understandable that the floating gun head for self-tapping tightening disclosed herein can be configured with multiple gun heads simultaneously to perform self-tapping tightening on multiple positions, as the floating amount of its multi-tooth gun head 100 can be adjusted according to the offset state of the work position hole, so as to meet actual needs.

[0035] It should be noted that the floating connection of the first end of the aforementioned adapter 200 to the multi-tooth gun head 100 means that the first end of the adapter 200 is connected to the multi-tooth gun head 100, enabling the multi-tooth gun head 100 to rotate together. However, the two can also float, meaning that the multi-tooth gun head 100 can rotate a preset angle relative to the adapter 200 to adapt to the work position hole of the part to be assembled. Compared to related technologies, where the self-tapping nut and the mounting hole cannot always maintain coaxiality, and the screw cannot enter the mounting hole if there is a deviation, the floating gun head disclosed in this invention for self-tapping screw tightening only requires placing the fastener on the bit of the tightening gun. After the gun head descends, the self-tapping screw automatically corrects its position according to the mounting hole, having a large floating range, allowing the tightening gun to tighten the self-tapping nut to the target position.

[0036] The floating adjustment component 300 can be constructed using any suitable structure, such as... Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, in some embodiments, the elastic element 310 is sleeved on the adapter 200, with one end of the elastic element 310 abutting against the multi-toothed gun head 100 and the other end connected to the elastic sleeve 320. The elastic sleeve 320 is sleeved around the circumference of the elastic element 310 and is positionably connected to the adapter 200. By adjusting the connection position of the elastic sleeve 320 in the adapter 200, the floating amount between the multi-toothed gun head 100 and the adapter 200 can be adjusted. Specifically, the elastic element 310 can be sleeved around the circumference of the adapter 200, and the elastic sleeve 320 can be sleeved around the circumference of the elastic element 310. The elastic sleeve 320 is positionably connected to the adapter 200 along its axial direction. One end of the elastic element 310 is connected to the adapter 200, for example, through a fixed connection or abutment, and the other end abuts against the multi-toothed gun head 100. One end of the elastic element 310 is connected to the elastic sleeve 320, and the other end abuts against the multi-tooth gun head 100, which can apply a thrust to the multi-tooth gun head. By adjusting the connection position of the elastic sleeve 320 on the adapter 200, the thrust of the elastic element 310 acting on the multi-tooth gun head 100 can be adjusted, thereby adjusting the floating amount between the multi-tooth gun head 100 and the adapter 200.

[0037] It should be noted that, in order to seal the connection between the multi-tooth gun head 100 and the adapter 200, a sealing element 330 can be fitted onto the adapter 200. This sealing position is located at the end of the multi-tooth gun head 100 away from the guide rod 120, and a groove can be formed thereon. One end of the elastic element 310 (e.g., a spring) abuts against the inside of the groove, and the other end of the elastic element 310 abuts against the stop portion provided inside the elastic sleeve 320. By rotating the elastic sleeve 320, the pressure of the elastic element 310 acting on the multi-tooth gun head 100 can be adjusted, thereby adjusting the floating amount of the multi-tooth gun head 100.

[0038] In other embodiments, the floating adjustment assembly 300 includes an elastic element 310 and an elastic sleeve 320; the elastic element 310 is sleeved on the adapter 200, with one end of the elastic element 310 abutting against the adapter 200 and the other end connected to the elastic sleeve 320, the elastic sleeve 320 being sleeved around the elastic element 310, and the end of the elastic sleeve 320 away from the drive member 400 abutting against the multi-tooth gun head 100, the elastic sleeve 320 being positionably connected to the adapter 200 to adjust the floating amount between the adapter 200 and the multi-tooth gun head 100.

[0039] The elastic element 310 can be sleeved around the circumference of the adapter 200, and the elastic sleeve 320 can be sleeved around the circumference of the elastic element 310. One end of the elastic sleeve 320 abuts against the multi-toothed gun head 100, and the elastic sleeve 320 is axially adjustable in its connection to the adapter 200. One end of the elastic element 310 is connected to the adapter 200, for example, through a fixed connection or abutment, while the other end abuts against the elastic sleeve 320. The elastic element 310 can apply a thrust to the elastic sleeve 320, enabling the elastic sleeve 320 to apply a thrust to the multi-toothed gun head 100. The amount of floating between the adapter 200 and the multi-toothed gun head 100 can be adjusted by adjusting the connection position of the elastic sleeve 320 on the adapter 200.

[0040] After the multi-toothed gun head 100 rotates a certain angle with the adapter 200 (e.g., the square plug at the first end), when the rotational force is removed, the multi-toothed gun head 100 is affected by the thrust of the elastic sleeve 320 and returns to the coaxial state with the adapter 200, thereby realizing the floating function. The elastic sleeve 320 is connected to the adapter 200 in an adjustable position and can be tightened and loosened. By tightening and loosening, the compression state of the elastic element 310 is restricted, thereby achieving the function of adjusting the floating amount.

[0041] The elastic element 310 includes, but is not limited to, a spring, and may also be, for example, a sheet or elastic rubber.

[0042] The connection method between the elastic sleeve 320 and the adapter 200 can be any suitable, such as Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the adapter 200 includes a first external thread 230, and the elastic sleeve 320 includes a first internal thread. The first external thread 230 is screwed into the first internal thread. The adapter 200 has the first external thread 230, while the elastic sleeve 320 has a first internal thread that can thread-mate with the first external thread 230. The two are connected by threads, and the adapter 200 can be tightened and loosened by rotating the elastic sleeve 320, adjusting the floating amount between the adapter 200 and the multi-tooth gun head 100.

[0043] The floating connection between the adapter 200 and the multi-tooth gun head 100 can adopt any suitable structure. In some embodiments, the first end of the adapter 200 forms a first connector portion 210, and the multi-tooth gun head 100 includes a second connector portion 101. The first connector portion 210 and the second connector portion 101 are connected by a first radial locking member, so that the multi-tooth gun head 100 can rotate synchronously with the adapter 200, and the multi-tooth gun head 100 can deflect a preset angle relative to the central axis of the adapter 200. The first connector portion 210 and the second connector portion 101 have through holes through which the first radial locking member passes. To achieve the floating connection between the first connector portion 210 and the second connector portion 101, i.e., the multi-tooth gun head 100 can rotate a certain angle relative to the axis of the adapter 200, the size of the first radial locking member needs to be smaller than the size of the through hole, with a certain gap between them, so that the first connector portion 210 and the second connector portion 101 can rotate synchronously while also having a certain amount of floating.

[0044] like Figures 5 to 9 As shown, in some embodiments, the first connector portion 210 is configured as a square plug 2101 with a first radial pin hole 211, the second connector portion 101 is configured as a square groove 1011 with a second radial pin hole 102, the first radial locking member is configured as a first pin 212, and the size of the first pin 212 is smaller than the size of the second radial pin hole 102; the first pin 212 is inserted into the first radial pin hole 211 and the second radial pin hole 102 for floating connection of the square plug 2101 and the square groove 1011.

[0045] The first connector 210 is a square plug 2101, and the second connector 101 is a square groove 1011 corresponding to the square plug 2101. The square plug 2101 has a first radial pin hole 211, and the square groove 1011 has a second radial pin hole 102. The first radial locking member is a first pin 212, which is inserted into the first radial pin hole 211 and the second radial pin hole 102, thereby connecting the square plug 2101 to the square groove 1011 and preventing them from detaching axially. Through this configuration, the second connector 101 is connected to the first connector 210, allowing the multi-tooth gun head 100 to rotate with the adapter 200. Furthermore, because the radial dimension of the first pin 212 is smaller than the dimension of the second radial pin hole 102, the two are floatingly connected. This means the multi-tooth gun head 100 can float relative to the adapter 200 by rotating at a certain angle, facilitating alignment with the workpiece hole.

[0046] Since the first pin 212 and the second radial pin hole 102 are clearance-fitted, in order to prevent the first pin 212 from falling out of the second radial pin hole 102, as follows: Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, the floating head for self-tapping tightening further includes a retaining ring 140, which is fitted around the circumference of the multi-toothed head 100 and corresponds to the second radial pin hole 102, to prevent the first pin 212 from dislodging. The first pin 212 is fixed by inserting it into the second radial pin hole 102 on the multi-tooth gun head 100 and the first radial pin hole 211 of the adapter 200, and a retaining ring 140 (e.g., a stainless steel retaining ring 140) is fitted on the outside of the multi-tooth gun head 100 to prevent the first pin 212 from slipping out, thus improving the connection reliability. It should be noted that, in order to avoid axial movement of the retaining ring 140, a first annular groove 103 can be provided on the outer periphery corresponding to the second radial pin hole 102. By arranging the retaining ring 140 in the first annular groove 103, the movement of the retaining ring 140 is limited, thereby better fixing the first pin 212.

[0047] In other embodiments, the first connector 210 is constructed as a square groove 1011, and the second connector 101 is constructed as a square plug 2101 corresponding to the square groove 1011. Both the square groove 1011 and the square plug 2101 have pin holes. The first radial locking member is constructed as a pin, which is inserted into the two pin holes, thereby connecting the square plug 2101 to the square groove 1011 to prevent them from falling off in the axial direction. This also enables the connection between the first connector 210 and the second connector 101, allowing the multi-tooth gun head 100 to rotate together with the adapter 200. At the same time, because the radial dimension of the pin is smaller than the pin hole size, the two are floatingly connected. That is, the multi-tooth gun head 100 can also float relative to the adapter 200 by rotating a certain angle, which is convenient for aligning the workpiece hole.

[0048] The multi-toothed gun head 100 can be designed according to implementation requirements, such as... Figure 6 and Figure 7As shown, in some embodiments, the multi-tooth gun head 100 includes a multi-tooth head 110 and a guide rod 120 located at the front end of the multi-tooth head 110; the multi-tooth gun head 100 also includes a magnetic suction member 130 surrounding the multi-tooth head 110 and located at the rear end of the multi-tooth head 110. The multi-tooth head 110 is used to drive the bolts to be fitted to rotate to achieve the tightening function. The guide rod 120 is located at the front end of the multi-tooth head 110 and plays a guiding role, and the guide rod 120 also prevents the self-tapping screws from shaking. In addition, the multi-tooth gun head 100 also includes the magnetic suction member 130 for attracting and tightening the screws. It should be noted that the magnetic suction member 130 may include a magnetic ring 132 sleeve 131 and a collar. The magnetic ring 132 is installed inside the magnetic ring 132 sleeve 131 and surrounds the circumference of the multi-tooth head 110. The magnetic ring 132 attracts the tightened screws, preventing the screws from falling off after installation.

[0049] In order to achieve connection with the drive unit 400, such as Figures 5 to 9 As shown, in some embodiments, the adapter 200 further includes a third connector 220 at the end away from the first connector 210; the drive spindle 410 of the drive member 400 is provided with a fourth connector 411, and the third connector 220 is connected to the fourth connector 411, so that the drive member 400 can drive the adapter 200 to rotate. Specifically, the third connector 220 is provided at the end of the adapter 200 away from the first connector 210, while the fourth connector 411, corresponding to and capable of cooperating with the third connector 220, is arranged on the drive spindle 410 of the drive member 400. When the drive member 400 rotates, it can drive the adapter 200 and the multi-tooth gun head 100 connected to the first end of the adapter 200 to rotate synchronously for tightening operations.

[0050] The third connector 220 and the fourth connector 411 can be constructed using any suitable structure. Optionally, one of the third connector 220 and the fourth connector 411 can be constructed as a square plug, and the other as a square recess, with the square plug and the square recess connected by a second radial locking member. For example, the third connector 220 can be constructed as a square recess, while the fourth connector 411 can be constructed as a square plug, and the two can be fixedly connected together by radially arranged pins. Of course, the third connector 220 can also be constructed as a square plug, and the fourth connector 411 can also be constructed as a square recess; similarly, the two can also be connected by pins that radially pass through them. This allows the drive member 400 to drive the adapter 200 to rotate.

[0051] It should be noted that in some embodiments, the second radial locking member can be configured as a second pin 222. The second pin 222 connects the two by passing through the fourth radial pin hole 412 respectively provided on the square plug 2101 and the third radial pin hole 221 provided on the square groove 1011. In order to prevent the second pin 222 from radially dislodging, an elastic retaining ring 250 (e.g., an O-ring) can be fitted around the second pin 222 in the circumferential direction. For example, the third connector portion 220 is configured as a square groove and the fourth connector portion 411 is configured as a square plug. The elastic retaining ring 250 can be fitted around the outer circumference of the adapter 200 and arranged corresponding to (covering) the third radial pin hole 221 on the square groove.

[0052] It should be noted that, in order to prevent the axial movement of the elastic retaining ring 250, a second annular groove 260 can be provided on the outer periphery corresponding to the third radial pin hole 221. By arranging the elastic retaining ring 250 in the second annular groove 260, the movement of the elastic retaining ring 250 is limited, so as to better fix the second pin 222.

[0053] like Figures 1 to 3 As shown, in some embodiments, the floating gun head for self-tapping tightening further includes a first mounting plate 610 and a gun head mounting plate 620; the drive member 400 is connected to the first mounting plate 610, and the drive spindle 410 of the drive member 400 is constructed as a telescopic spindle, which passes through the first mounting plate 610 and is connected to the adapter 200; the gun head mounting plate 620 is also provided with a bearing mounting seat 630, and the adapter 200 is rotatably connected to the bearing mounting seat 630 through the first bearing 510; the floating gun head for self-tapping tightening also includes a clamping assembly, one end of which is connected to the first mounting plate 610 and the other end of which is connected to the gun head mounting plate 620, in order to increase the self-tapping tightening pressure.

[0054] The first mounting plate 610 and the gun head mounting plate 620 are arranged at intervals. The drive component 400 is mounted on the first mounting plate 610, and the clamping assembly is arranged between the first mounting plate 610 and the gun head mounting plate 620. To accommodate changes in the distance between the first mounting plate 610 and the gun head mounting plate 620, the drive spindle 410 of the drive component 400 is constructed as a telescopic spindle that can extend and retract. One end of the clamping assembly is connected to the first mounting plate 610, and the other end is connected to the gun head mounting plate 620. The force applied to the gun head mounting plate 620 by the clamping assembly increases the downward pressure on the multi-tooth gun head 100, satisfying the tightening operation. It should be noted that the connection method between the first mounting plate 610 and the drive component 400 can be designed according to the installation requirements. The telescopic spindle of the drive component 400 itself has a force of 48-60N. The self-tapping tightening of this disclosure requires a downward pressure that, after testing, is much greater than 60N. Therefore, the clamping assembly is added to increase the downward pressure acting on the tightening gun head.

[0055] The clamping assembly can be constructed using any suitable structure. It may include a cylinder 640 connected to the first mounting plate 610, with the piston rod 641 of the cylinder 640 passing through the first mounting plate 610 and connected to the gun head mounting plate 620. Alternatively, the clamping assembly may be constructed as an elastic clamping member sleeved on the telescopic spindle, with one end of the elastic clamping member connected to the first mounting plate 610 and the other end connected to the gun head mounting plate 620.

[0056] like Figure 1 As shown, in some embodiments, the clamping assembly may include a cylinder 640 connected to a first mounting plate 610. The piston rod 641 of the cylinder 640 passes through the first mounting plate 610 and is connected to a gun head mounting plate 620, for applying pressure to the gun head mounting plate 620 and the adapter 200 and multi-tooth gun head 100 connected to the gun head mounting plate 620, so as to increase the downward pressure during self-tapping tightening.

[0057] In other embodiments, the clamping assembly may also be configured as an elastic clamping member, such as a clamping spring, fitted around the outer ring of the telescopic spindle of the drive member 400. The elastic force of the elastic clamping member can also increase the downward pressure of the self-tapping tightening.

[0058] like Figure 1 and Figure 3 As shown, in some embodiments, the diverter is rotatably connected to the bearing mounting seat 630 via a first bearing 510. The inner ring of the first bearing 510 is fixedly sleeved on the adapter 200, and one side of the first bearing 510 abuts against the shoulder 240 of the adapter 200. The outer ring of the first bearing 510 is connected to the bearing mounting seat 630. The floating head for self-tapping also includes a locking nut 520 axially movably connected to the adapter 200. The locking nut 520 abuts against the other side of the first bearing 510 for axial locking of the first bearing 510. The locking nut 520 can also be threaded onto the first external thread 230, and by rotating the locking nut 520 on the first external thread 230, the outer and inner rings of the first bearing 510 are brought into contact, achieving a working state. It should be noted that the locking nut 520 may have a loosening washer to prevent the first bearing 510 from loosening during equipment operation. The first bearing 510 includes, but is not limited to, a one-way thrust ball bearing.

[0059] When the clamping assembly is a cylinder 640, it needs to be positioned on one side of the telescopic spindle. During its extension and retraction, it may create a lever arm on the telescopic spindle, causing uneven extension and retraction. In some embodiments, the floating head for self-tapping tightening also includes at least one guide assembly 650 connected to the first mounting plate 610 and the head mounting plate 620, respectively. This guide assembly 650 guides the telescopic spindle of the drive member 400 as it is driven to move by the piston rod 641 of the cylinder 640. By arranging the guide assembly 650, the uneven force caused by the cylinder 640 is balanced, allowing the telescopic spindle to extend and retract smoothly, thus improving the operational stability of the floating head for self-tapping tightening.

[0060] It should be noted that there can be one guide assembly 650, which is arranged on the other side of the telescopic spindle opposite to the cylinder 640, and can balance the movement of the cylinder 640.

[0061] like Figure 3 As shown, in some other embodiments, there can be two guide components 650. The two guide components 650 and the cylinder 640 can be arranged around the circumference of the telescopic spindle in a triangular arrangement, or they can be located on the same circumference with the center of the axis of the telescopic spindle as the center, so as to realize the stable extension and retraction of the telescopic spindle.

[0062] Optionally, the guide assembly 650 includes a linear bearing 651 and a guide shaft 652. The linear bearing 651 is fixedly connected to the first mounting plate 610, and one end of the guide shaft 652 is connected to the gun head mounting plate 620, while the other end is slidably connected to the linear bearing 651. The linear bearing 651 can be mounted on the first mounting plate 610 via a linear bearing 651 mounting seat. One end of the guide shaft 652 is fixed to the gun head mounting plate 620, while the other end is slidably connected to the linear bearing 651, thereby achieving a guiding function during the extension and retraction of the telescopic spindle.

[0063] The piston rod 641 of the cylinder 640 is connected to the gun head connecting plate, one end of the guide shaft 652 is connected to the gun head mounting plate 620, and the other end of the guide shaft 652 is slidably connected in the linear bearing 651. The cylinder 640 drives the gun head mounting plate 620 to reciprocate along the axis of the linear bearing 651. The telescopic main shaft can extend and retract appropriately to adapt to the movement of the gun head mounting plate 620.

[0064] It should be noted that the overall design of the floating gun head used for self-tapping tightening is rigid enough to cover bolt tightening with torques of over 300 Nm.

[0065] According to a second aspect of this disclosure, an assembly apparatus is also provided, comprising at least one of the aforementioned floating head for self-tapping tightening. Therefore, this assembly apparatus also possesses all the advantages of the aforementioned floating head for self-tapping tightening, which will not be elaborated upon here.

[0066] It is understood that the assembly device may include multiple floating heads for self-tapping tightening, which can simultaneously perform self-tapping tightening operations on multiple positions. The number of floating heads for self-tapping tightening depends on the number of workpiece holes on the part.

[0067] The floating gun head and assembly device disclosed herein for self-tapping screw tightening address the technical problem that the self-tapping nut and the mounting hole cannot always maintain coaxiality, and that the screw cannot enter the mounting hole if there is a deviation. A floating gun head for self-tapping screw tightening is developed. Simply place the fastener on the screwdriver bit of the tightening gun, and after the gun head descends, the self-tapping screw automatically corrects its position according to the mounting hole. It has a large floating range, and the tightening gun can tighten the self-tapping nut to the target position.

[0068] The assembly device disclosed herein can be equipped with multiple tightening guns simultaneously to meet actual needs, and can perform self-tapping tightening at multiple positions at the same time because the floating amount of its gun head can be adjusted according to the offset state of the workpiece hole. The floating gun head and assembly device of this invention for self-tapping tightening can realize the automated operation of screwing fasteners into the target position.

[0069] Compared with existing technologies, this disclosure is the first to invent a floating gun head solution for self-tapping installation of integrated large die-cast parts, filling a gap in the industry. Furthermore, the floating amount of the multi-toothed gun head 100 can be adjusted according to actual operating conditions, ensuring the stability of multiple self-tapping installations simultaneously. Based on this gun head design, a multi-stage speed control scheme for high-torque self-tapping installation was developed to ensure the stable assembly of the self-extruding nut.

[0070] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0072] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A floating gun for self-tapping, characterized in that, The utility model relates to a floating gun head for self-tapping, comprising: a multi-tooth gun head; a conversion joint comprising a first end and a second end, the first end being floatingly connected to the multi-tooth gun head; a floating adjusting assembly, sleeved on the conversion joint, one end connected to the multi-tooth gun head, the other end connected to the conversion joint, for adjusting the pre-tightening force between the conversion joint and the multi-tooth gun head; and a driving member connected to the second end of the conversion joint, for driving the conversion joint and the multi-tooth gun head to rotate. The floating adjusting assembly comprises an elastic member and an elastic sleeve.

2. A self-tapping floating gun head according to claim 1, characterized in that, The elastic member is sleeved on the conversion joint, one end of the elastic member abutting against the multi-tooth gun head, the other end connected to the elastic sleeve, the elastic sleeve being sleeved on the circumference of the elastic member, and the elastic sleeve being adjustably connected to the conversion joint, the floating amount of the multi-tooth gun head and the conversion joint being adjusted by adjusting the connection position of the elastic sleeve on the conversion joint; or The elastic member is sleeved on the conversion joint, one end of the elastic member abutting against the conversion joint, the other end connected to the elastic sleeve, the elastic sleeve being sleeved on the circumference of the elastic member, one end of the elastic sleeve away from the driving member abutting against the multi-tooth gun head, and the elastic sleeve being adjustably connected to the conversion joint, for adjusting the floating amount of the multi-tooth gun head and the conversion joint. The conversion joint comprises a first external thread, and the elastic sleeve comprises a first internal thread, the first external thread being screwed with the first internal thread.

3. A floating tap head for self-tapping according to claim 2, characterized in that The first end of the conversion joint is formed with a first joint part, the multi-tooth gun head comprises a second joint part, the first joint part and the second joint part being connected by a first radial locking member, so that the multi-tooth gun head can rotate synchronously with the conversion joint, while the multi-tooth gun head can be deflected by a preset angle relative to the central axis of the conversion joint.

4. A floating tap head for self-tapping according to any one of claims 1-3, characterized in that, The first joint part is configured as a square plug with a first radial bolt hole, and the second joint part is configured as a square groove with a second radial bolt hole.

5. A self-tapping floating gun head as defined in claim 4, wherein, The first radial locking member is configured as a first bolt, and the size of the first bolt is smaller than the size of the second radial bolt hole. The first bolt hole is inserted into the first radial bolt hole and the second radial bolt hole, for floating connection of the square plug and the square groove. The floating gun head for self-tapping further comprises a collar, sleeved on the circumference of the multi-tooth gun head and corresponding to the second radial bolt hole, for preventing the first bolt from coming out.

6. A self-tapping floating gun head as defined in claim 5, wherein, The multi-tooth gun head comprises a multi-tooth head and a guide rod located at the front end of the multi-tooth head.

7. A floating tap head for self-tapping according to claim 1, characterized in that The multi-tooth gun head further comprises a magnetic member, which is arranged around the multi-tooth head and located at the rear end of the multi-tooth head. The conversion joint further comprises a third joint part located at one end away from the first joint part.

8. A self-tapping floating gun head as defined in claim 4, wherein, The driving spindle of the driving member is provided with a fourth joint part, the third joint part and the fourth joint part being connected, so that the driving member can drive the conversion joint to rotate. One of the third joint part and the fourth joint part is configured as a square plug, and the other is configured as a square groove, the square plug and the square groove being connected by a second radial locking member.

9. A self-tapping floating gun head as defined in claim 8, wherein, ​ 10. A floating tap head for self-tapping according to claim 1, characterized in that, The floating gun head for self-tapping further comprises a first mounting plate and a gun head mounting plate; The driving member is connected to the first mounting plate, and a driving spindle of the driving member is configured as an extension spindle which is connected to the conversion joint after passing through the first mounting plate; The gun head mounting plate is provided with a bearing mounting seat, and the conversion joint is rotatably connected to the bearing mounting seat through a first bearing; The floating gun head for self-tapping further comprises a pressing assembly which is connected to the first mounting plate at one end and to the gun head mounting plate at the other end, so as to increase the pressing force for self-tapping.

11. A self-tapping floating gun head as defined in claim 10, wherein, The pressing assembly comprises a cylinder connected to the first mounting plate, and a piston rod of the cylinder is connected to the gun head mounting plate after passing through the first mounting plate; or The pressing assembly is configured as an elastic pressing member which is sleeved on the extension spindle, and one end of the elastic pressing member is connected to the first mounting plate and the other end is connected to the gun head mounting plate.

12. A self-tapping floating gun head as defined in claim 10, wherein, An inner ring of the first bearing is fixedly sleeved on the conversion joint, and one side of the first bearing abuts against a shaft shoulder of the conversion joint, and an outer ring of the first bearing is used to be connected to the bearing mounting seat; The floating gun head for self-tapping further comprises a locking nut which is axially movably connected to the conversion joint, and the locking nut abuts against the other side of the first bearing, so as to axially lock the first bearing.

13. A self-tapping floating gun head as defined in claim 10, wherein, The floating gun head for self-tapping further comprises at least one guide assembly which is respectively connected to the first mounting plate and the gun head mounting plate, so as to guide the movement of the gun head mounting plate driven by the pressing assembly and the extension and retraction of the extension spindle of the driving member.

14. A self-tapping floating gun head as defined in claim 13, wherein, The guide assembly comprises a linear bearing and a guide shaft; The linear bearing is fixedly connected to the first mounting plate, and one end of the guide shaft is connected to the gun head mounting plate and the other end is slidably connected to the linear bearing.

15. An assembly device characterized in that, The assembly device comprises at least one floating gun head for self-tapping according to any one of claims 1-14.

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