Multi-bolt synchronous tightening device and method

Abstract

The invention discloses a multi-bolt synchronous tightening device and method and a transmission mechanism. The multi-bolt synchronous tightening device comprises a power input shaft fixed to a plane, a sun gear on the power input shaft, planet gears distributed on the periphery of the sun gear and meshed with the sun gear, and output gears meshed with the planet gears from the outside. The adjustable bolt fixing mechanisms are arranged on the power output wheels and used for fixing bolts with different shaft diameters; and the shaft diameter changing connecting rod mechanism changes the distance radius between the driving bolt fixing mechanisms through a multi-connecting-rod driving structure. The device can be universally used under multiple working conditions, synchronous fixing operation of multiple bolt connecting structures is achieved, and the assembling efficiency is improved. And the same force can be applied to the connected object, so that the problems of large stress, large deformation and the like of bolt positions of parts caused by non-uniform stress on each connecting position of the connected object are solved, and the assembly quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical assembly equipment, and in particular to a multi-bolt synchronous tightening device and method. Background Art

[0002] Mechanical structures are often connected using bolts, and a common bolt arrangement is a circumferentially symmetrical arrangement of multiple bolts. During conventional bolt assembly, each bolt must be tightened multiple times in a specific tightening sequence. This method of tightening is inefficient and can easily result in uneven preload across the bolt connections.

[0003] In addition, during the process of multi-bolt arrangement and fixed connection, inconsistent pre-tightening force of each bolt connection will increase the assembly deformation of the connected objects and reduce the performance and life of the mechanical structure.

[0004] Therefore, there is an urgent need for a synchronous tightening device for circumferentially symmetrically distributed bolts to achieve consistent bolt pre-tightening force during the assembly process, thereby reducing the assembly deformation of the mechanical structure and meeting the high-efficiency and high-quality assembly requirements of circumferentially symmetrically distributed bolts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multi-bolt synchronous tightening device and method to achieve synchronous fixing operations of multiple bolt connection structures and improve assembly efficiency.

[0006] Furthermore, the present invention is applicable to multiple working conditions, so that the bolts can apply the same amount of force to the connected objects at the same time, solving the problems of high stress and deformation at the bolt positions of components caused by uneven force at various connection positions of the connected objects, thereby improving assembly efficiency and assembly quality at the same time.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A multi-bolt synchronous tightening device, comprising: The transmission mechanism includes a power input shaft fixed on a plane, a sun gear on the power input shaft, planetary gears distributed around the sun gear and meshing with the sun gear, and an output gear meshing with the planetary gears from the outside; Multiple adjustable bolt fixing mechanisms are provided on each power take-off wheel for fixing bolts of different shaft diameters; The shaft diameter changing connecting rod mechanism includes multiple connecting rods connected between each planetary gear and the output gear, drives the bolt fixing mechanism through the transmission mechanism, and is configured to be driven by the transmission mechanism to change the spacing radius between each adjustable bolt fixing mechanism through multiple connecting rods.

[0008] In the above technical solution, the shaft diameter changing connecting rod mechanism includes: Multiple three-rotation pair V-shaped connecting rods, with shaft holes set at the apex and both ends of the V; Multiple double-rotating connecting rods with shaft holes set at both ends of the connecting rods; Double rotating pair fixed rods, with shaft holes set at both ends of the fixed rods, connecting the fixed shafts of each output wheel and each planetary wheel from the top and bottom respectively; The V-shaped vertex of the three rotating pairs is fixed on one of the planetary gear shafts and connected to the output gear shaft group through the shaft hole, and the planetary gear shaft to which the V-shaped vertex of the three rotating pairs is not fixed is connected to the output gear shaft group through the double rotating pair fixing rod; The output wheel shaft corresponding to the planetary gear at the V-shaped vertex of the three rotating pairs is not fixed and is hinged to one end shaft hole of the adjacent three rotating pairs through a double rotating pair connecting rod; The V-shaped vertices of the remaining three rotating pair V-shaped connecting rods are hinged to the shaft holes at one end of the adjacent three rotating pairs through the double rotating pair connecting rods.

[0009] In the above technical solution, when N sets of planetary gears are provided, N-1 three-rotation pair V-shaped connecting rods and double-rotation pair connecting rods are provided respectively; of course, N is a natural number greater than 0.

[0010] In the above technical solution, the adjustable bolt fixing mechanism is a sleeve-shaped structure, the bottom and back of the sleeve are fixed on the axle of each output wheel, and multiple elastic columns are arranged at the bottom of the sleeve parallel to the sleeve wall. The multiple elastic columns are evenly distributed along the circumference of the sleeve and arranged in multiple circles at intervals. The elastic columns in the central part are configured to be compressed when subjected to pressure from foreign objects invading toward the bottom cover, while the outer elastic columns remain unchanged to clamp the foreign objects.

[0011] In the above technical solution, the elastic column is a fixed cylinder connected to the bottom of the sleeve through a spring.

[0012] In the above technical solution, the foreign objects are bolts with different shaft diameters.

[0013] In the above technical solution, the end of the power input shaft is configured to be a pointed head or a flat head suitable for various electric torque wrenches or manual torque wrenches so as to be connected to an external power device.

[0014] In the above technical solution, the transmission mechanism and the shaft diameter changing connecting rod mechanism are installed in the fixed cavity, and the adjustable bolt fixing mechanism extends from the empty slot of the fixed cavity and moves along the empty slot.

[0015] In the above technical solution, the fixed cavity includes an upper cover and a lower bottom that are buckled together, and a radius scale is set at the junction of the upper cover or the lower bottom to be associated with the empty slot.

[0016] In the above technical solution, the number of the planetary gears, output gears and universal sleeves is the same, which is 3-6.

[0017] A method for synchronously tightening multiple bolts adopts the above-mentioned synchronous tightening device to simultaneously fix multiple bolts, adjust the distribution radius of multiple adjustable bolt fixing mechanisms through the shaft diameter changing connecting rod mechanism, and transmit torque to the multiple adjustable bolt fixing mechanisms through the transmission mechanism to clamp the bolts.

[0018] Compared with the prior art, the present invention has at least one of the following technical effects: (1) The present invention designs a multi-bolt synchronous tightening device and method. Through the integrated structure of the upper rotating outer cover and the fixed base plate, and the ingenious combination of the transmission mechanism, the shaft diameter changing connecting rod mechanism and the universal sleeve, the synchronous tightening of the circumferentially uniformly distributed bolts is achieved, and the universal sleeve after the radius is adjusted is locked by using a locking screw, so that the bolts simultaneously apply the same amount of force to the connected objects, so that the various connection positions of the connected objects are evenly stressed, reducing the stress and deformation of the parts when the bolts are tightened, improving the assembly efficiency and improving the assembly quality.

[0019] (2) The universal socket in the present invention utilizes the internal multi-cylindrical locking structure to tighten various types of bolts on the market, has good adaptability, can be widely used in various mechanical assembly fields, has wide application, and is conducive to promotion.

[0020] (3) The power input shaft of the present invention has a square head at the end with conventional dimensions, and can be widely used in various mechanical assembly wrenches, which is widely applicable and conducive to promotion.

[0021] (4) The present invention fixes the rotating outer cover and the fixed base plate with locking screws to prevent the distribution radius of the universal sleeve from changing during the tightening process, effectively ensuring the stability and safety of the equipment.

[0022] (5) The present invention realizes rapid adjustment of the universal sleeve distribution radius by setting scales on the rotating outer cover and the fixed bottom plate, which has great convenience and can significantly improve assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a disassembly diagram of the multi-bolt synchronous tightening device and method provided by the present invention (three bolts are tightened synchronously).

[0024] Figure 2 This is a schematic diagram of the internal structure of the multi-bolt synchronous tightening device and method provided by the present invention.

[0025] Figure 3 This is an overall schematic diagram of the power output side of the multi-bolt synchronous tightening device and method provided by the present invention.

[0026] Figure 4This is an overall schematic diagram of the power input side of the multi-bolt synchronous tightening device and method provided by the present invention.

[0027] Figure 5 This is a schematic diagram of the initial position of the shaft diameter changing connecting rod mechanism of the internal structure of the multi-bolt synchronous tightening device and method provided by the present invention.

[0028] Figure 6 This is a schematic diagram of the internal structure of the multi-bolt synchronous tightening device and method provided by the present invention, after the shaft diameter changes and the connecting rod mechanism changes the spacing radius.

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the shaft diameter changing connecting rod mechanism of the multi-bolt synchronous tightening device and method provided by the present invention.

[0030] Figure 8 A partial schematic diagram of the use of a universal socket for M5 bolts in the multi-bolt synchronous tightening device and method provided by the present invention.

[0031] Figure 9 A partial schematic diagram of the use of a universal socket for M6 bolts in the multi-bolt synchronous tightening device and method provided by the present invention.

[0032] Figure 10 This is a schematic diagram of the connection structure between the universal socket and the power take-off wheel of the multi-bolt synchronous tightening device and method provided by the present invention.

[0033] Figure 11 This is an example of a four-sleeve (bolt) solution for the multi-bolt synchronous tightening device and method provided by the present invention.

[0034] Figure 12 This is an example of a five-sleeve (bolt) solution for the multi-bolt synchronous tightening device and method provided by the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Example 1: Combine Figure 1-Figure 7 The multi-bolt synchronous tightening device and method of this embodiment are described.

[0037] Figure markings: 1-transmission mechanism; 101-power input sun gear; 102-power transmission planetary gear; 103-power output gear; 2-axis diameter changing connecting rod mechanism; 201-double rotating pair lower fixed rod; 202-double rotating pair connecting rod; 203-double rotating pair upper fixed rod; 204-triple rotating pair V-shaped connecting rod; 3-universal socket; 4-upper rotating outer cover; 5-fixed base plate; 6-first fixing screw; 7-second fixing screw; 8-locking screw; 9-rotating pin; 10-pin fixing nut; 11-power input shaft; 12-third fixing screw; 13-fixed cylinder; 14-M5 bolt; 15-M6 bolt.

[0038] The multi-bolt synchronous tightening device and method of this embodiment includes a transmission mechanism 1 and an axial diameter changing connecting rod mechanism 2. The transmission mechanism 1 and the axial diameter changing connecting rod mechanism 2 are installed on a fixed base plate 5. The transmission mechanism 1 transmits torque to the universal sleeve 3 for sleeve-fitting the bolts for synchronous tightening of the bolts.

[0039] Transmission mechanism 1 includes a power input shaft 11, on which a power input sun gear 101 is mounted via a third fixing screw 12. A shaft diameter-changing linkage mechanism 2 changes the distribution radius of the universal sleeve 3 by rotating the upper rotating housing 4. Three internal power transmission planetary gears 102 rotate around power input sun gear 101 while their gears mesh. A power output gear 103 also rotates around power transmission planetary gears 102 while their gears mesh.

[0040] There are three power transmission planetary gears 102 , power output gears 103 and universal sleeves 3 .

[0041] In this embodiment, Figure 2 As shown, due to the uniform distribution of the multiple bolts around the circumference, the power input shaft 11 is located at the center of the circular fixed base plate 5. The three internal power transmission planetary gears 102 are located at different radii passing through the power input shaft 11. The three axles are arranged in an equilateral triangle with the power input shaft 11 at its center. The three internal power transmission planetary gears 102 each mesh with the power input sun gear 101 from the periphery. The three power output gears 103 are located at different radii passing through the power input shaft 11 and each meshes with the corresponding internal power transmission planetary gear 102 from the periphery.

[0042] like Figure 3As shown, on the power output side, three power takeoff wheels 103 coaxially secure the universal sleeve 3. These wheels 103 are connected to the back of the top cover of the universal sleeve 3 via connecting shafts. Each connecting shaft rotates through a strip groove on the top cover of the cylindrical rotating housing 4, thereby changing the spacing between the multiple universal sleeves 3 or the diameter of the multiple bolts. The strip grooves are symmetrically spaced on the circular rotating housing 4, and their shape corresponds to the motion trajectory of the three power takeoff wheels 103.

[0043] like Figure 4 As shown, on the power input side, the fixed base plate 5 is used to fix the transmission mechanism 1 and the shaft diameter changing connecting rod mechanism 2. The power input shaft 11 passes through the center of the fixed base plate 5 and extends into the cavity formed by the rotating outer cover 4 and the fixed base plate 5, driving the power input sun gear 101.

[0044] The transmission mechanism 1 drives the power transmission planetary gear 102 through the power input shaft 11 and the power input sun gear 101, and finally transfers the torque to the power output gear 103 and the universal sleeve 3.

[0045] The structure of the shaft diameter changing connecting rod mechanism 2 is as follows Figure 1-Figure 2 、 Figure 5-Figure 7 As shown: The planetary gear and power wheel assembly in the figure is shown with the first group on the left, the second group on the bottom, and the third group on the upper right, counterclockwise. The first three-rotational pair V-shaped connecting rod 204 has axial holes at the apex and both ends of the V-shape. The apex is fixed to the first set of planetary gear axles. One end axial hole is fixed to a second set of power output axles, and the other end axial hole is hinged to one end axial hole of a double-rotational pair connecting rod 202 via a bolt structure. The other end axial hole of the double-rotational pair connecting rod 202 is fixed to the second set of power output axles. The double-rotational pair upper fixed rod 203 and the double-rotational pair lower fixed rod 201 connect the fixed shafts of each power output wheel to the fixed shafts of each planetary gear from the top and bottom, respectively.

[0046] One end of the connecting rod 202 of the second double rotating pair is fixed to the V-shaped vertex of the first three-rotating pair V-shaped connecting rod 204, and the other end is hinged to the shaft hole at one end of the second three-rotating pair V-shaped connecting rod 204; the V-shaped vertex of the second three-rotating pair V-shaped connecting rod 204 is fixed to the third set of planetary gear axles; the other end shaft hole of the second three-rotating pair V-shaped connecting rod 204 is fixed to the third set of power output wheel axles.

[0047] At the same time, the interconnection between the double rotating pair lower fixed rod 201, the double rotating pair upper fixed rod 203, the double rotating pair connecting rod 202 and the triple rotating pair V-shaped connecting rod 204 ensures that the three universal sleeves are evenly distributed along the circumference, ultimately achieving the use of different bolts distributed along different spacing radii.

[0048] The shaft diameter changing connecting rod mechanism 2 changes the spacing radius between the universal sleeves 3 by rotating the rotating outer cover 4. The double rotating pair lower fixed rod 201, the double rotating pair upper fixed rod 203, the double rotating pair connecting rod 202 and the triple rotating pair V-shaped connecting rod 204 are of specific lengths to ensure that the three universal sleeves are evenly distributed along the circumference.

[0049] It should be noted that the lengths of the double rotating pair lower fixed rod 201, the double rotating pair upper fixed rod 203, the double rotating pair connecting rod 202 and the triple rotating pair V-shaped connecting rod 204 are not unique and can be set according to actual conditions. They cannot be used as a limitation on the scope of protection of the present invention. Any setting methods related to the above should be within the scope of protection of the present invention.

[0050] The power input shaft 11 has a square head at the end with conventional dimensions to ensure that it is suitable for various electric torque wrenches or manual torque wrenches.

[0051] Working principle: The power input sun gear 101 transmits the torque to the power output gear 103 through the power transmission planetary gear 102. The power output gear 103 is connected to the universal socket 3, and the bolts are tightened synchronously.

[0052] When the locking screws 8 are not tightened, the upper rotating housing 4 and the fixed base plate 5 can rotate relative to each other. The universal sleeve 3 moves along the arc-shaped elongated groove on the upper rotating housing 4. At this time, under the constraint of the shaft diameter changing connecting rod mechanism 2, the power transmission planetary gear 102 rotates around the power input sun gear 101 under the premise of gear meshing, and the power output gear 103 rotates around the power transmission planetary gear 102 under the premise of gear meshing, so that the power output gear 103 and the universal sleeve 3 can change the spacing radius. At the same time, the lower fixed rod 201 of the double rotating pair, the upper fixed rod 203 of the double rotating pair, and the V-shaped connecting rod 204 of the three rotating pairs are determined according to the dimensions of the power transmission planetary gear 102 and the power output gear 103. The length of the double rotating pair connecting rod 202 is calculated based on the lengths of the lower fixed rod 201 of the double rotating pair, the upper fixed rod 203 of the double rotating pair, and the V-shaped connecting rod 204 of the three rotating pairs. Under the premise of changing the spacing radius, the universal sleeve 3 always ensures that its circumference is uniformly distributed.

[0053] Example 2: On the basis of Example 1, combined Figures 1 to 7 To explain this embodiment, the dual-rotation pair upper fixed rod 203 and the dual-rotation pair lower fixed rod 201 mount the power transmission planetary gear 102, the power output gear 103, and the dual-rotation pair connecting rod 202 on the fixed base plate 5. This ensures that the power transmission planetary gear 102, the power output gear 103, and the dual-rotation pair connecting rod 202 can rotate freely at both ends. The dual-rotation pair lower fixed rod 201, the dual-rotation pair upper fixed rod 203, and the triple-rotation pair V-shaped connecting rod 204 are determined based on the dimensions of the power transmission planetary gear 102 and the power output gear 103.

[0054] Example 3: On the basis of Example 1, combined Figures 1 to 7 In this embodiment, the double rotating pair connecting rod 202 has a specific length to ensure that the universal sleeve is always evenly distributed. The length of the double rotating pair connecting rod 202 is calculated based on the length of the double rotating pair lower fixed rod 201, the double rotating pair upper fixed rod 203, and the triple rotating pair V-shaped connecting rod 204.

[0055] Example 4: On the basis of Example 1, combined Figures 1 to 7 To illustrate this embodiment, in this embodiment, a radius scale is provided at the junction of the upper cover or the lower bottom of the fixed cavity and is associated with the empty slot.

[0056] Specifically, in this embodiment, the fixed base plate 5 is provided with scale indicating lines, and the upper rotating outer cover 4 is provided with scale lines, so as to achieve precise adjustment of different spacing radii.

[0057] Example 5: On the basis of Example 1, combined Figures 1 to 7 In this embodiment, the fixed base plate 5 is provided with a circular groove, and the upper rotating cover 4 is provided with a threaded hole. When in use, the locking screw 8 is tightened after adjusting to the appropriate spacing radius to lock the structure and ensure the stability of the device during use.

[0058] The top cover of the rotating outer cover 4 and the fixed base plate 5 are fixed with locking screws 8. The locking screws 8 are used to achieve rotational locking of the upper rotating outer cover 4 and the fixed base plate 5, so that the universal sleeve 3 cannot move on the upper rotating outer cover 4, thereby achieving the purpose of fixing the spacing radius of the universal sleeve 3.

[0059] Example 6: On the basis of Example 1, combined Figures 1 to 7 To illustrate this embodiment, in this embodiment, the power input sun gear 101 and the power output gear 103 have the same size parameters to ensure a 1:1 torque transmission. The output torque of a single universal socket 3 is 1 / 3 of the total input torque.

[0060] Example 7: On the basis of Example 1, combined Figure 8 and Figure 10 To illustrate this embodiment, a plurality of fixed cylinders 13 are provided inside the top cover of the universal sleeve 3 , which are parallel to the sleeve wall and perpendicular to the plane of the top cover. The rear end of each fixed cylinder 13 is connected to the connection portion of the top cover by a spring.

[0061] During use, the bolt compresses the fixed cylinder 13 corresponding to the nut toward the top cover of the universal socket 3. The fixed cylinder 13 surrounding the nut laterally clamps the bolt 14, securing the nut. This allows for tightening bolts of varying sizes. This embodiment illustrates the changes in the internal structure of the bolt 14 and the universal socket 3 when the universal socket is used with an M5 bolt.

[0062] like Figure 10 A shaft sleeve is provided on the back of the top cover of the universal sleeve 3 and is fixedly connected to the shaft rod of the power output wheel 103 so that the universal sleeve 3 and the power output wheel 103 rotate synchronously.

[0063] The material of the universal sleeve 3 is preferably chrome-vanadium alloy steel. Of course, commercial products can also be purchased.

[0064] Example 8: On the basis of Example 1, combined Figure 9 and Figure 10 To illustrate this embodiment, a plurality of fixed cylinders 13 are provided inside the top cover of the universal sleeve 3 , which are parallel to the sleeve wall and perpendicular to the plane of the top cover. The rear end of each fixed cylinder 13 is connected to the connection portion of the top cover by a spring.

[0065] During use, the bolt compresses the fixed cylinder 13 corresponding to the nut toward the top cover of the universal socket 3. The fixed cylinder 13 surrounding the nut laterally clamps the bolt 14, securing the nut. This allows for tightening bolts of varying sizes. This embodiment illustrates the changes in the internal structure of the bolt 14 and the universal socket 3 when the universal socket is used with an M6 bolt.

[0066] like Figure 10 A shaft sleeve is provided on the back of the top cover of the universal sleeve 3 and is fixedly connected to the shaft rod of the power output wheel 103 so that the universal sleeve 3 and the power output wheel 103 rotate synchronously.

[0067] The material of the universal sleeve 3 is preferably chrome-vanadium alloy steel. Of course, commercial products can also be purchased.

[0068] Example 9: Based on Example 1, this example Figure 11 1 is an example of a four-sleeve (bolt) solution of the multi-bolt synchronous tightening device and method of the present invention.

[0069] The number of the power transmission planetary gear 102 , the power output gear 103 and the universal sleeve 3 is four.

[0070] Example 10: Based on Example 1, this example Figure 12As shown, it is an example of a five-sleeve (bolt) solution of the multi-bolt synchronous tightening device and method provided by the present invention.

[0071] The number of the power transmission planetary gears 102 , the power output gears 103 and the universal sleeves 3 is five.

[0072] Of course, according to the efficiency and quality requirements of the synchronous work, those skilled in the art can implement the synchronous tightening or loosening operation of any number of sleeves (bolts).

[0073] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A multi-bolt synchronous tightening device, characterized in that include: The transmission mechanism includes a power input shaft fixed on a plane, a sun gear on the power input shaft, planetary gears distributed around the sun gear and meshing with the sun gear, and an output gear meshing with the planetary gears from the outside; Multiple adjustable bolt fixing mechanisms are provided on each power take-off wheel for fixing bolts of different shaft diameters; The shaft diameter changing connecting rod mechanism includes multiple connecting rods connected between each planetary gear and the output gear, drives the bolt fixing mechanism through the transmission mechanism, and is configured to be driven by the transmission mechanism to change the spacing radius between each adjustable bolt fixing mechanism through multiple connecting rods.

2. The multi-bolt synchronous tightening device according to claim 1, characterized in that The shaft diameter changing connecting rod mechanism comprises: Multiple three-rotation pair V-shaped connecting rods, with shaft holes set at the apex and both ends of the V; Multiple double-rotating connecting rods with shaft holes set at both ends of the connecting rods; Double rotating pair fixed rods, with shaft holes set at both ends of the fixed rods, connecting the fixed shafts of each output wheel and each planetary wheel from the top and bottom respectively; The V-shaped vertex of the three rotating pairs is fixed on one of the planetary gear shafts and connected to the output gear shaft group through the shaft hole, and the planetary gear shaft to which the V-shaped vertex of the three rotating pairs is not fixed is connected to the output gear shaft group through the double rotating pair fixing rod; The output wheel shaft corresponding to the planetary gear at the V-shaped vertex of the three rotating pairs is not fixed and is hinged to one end shaft hole of the adjacent three rotating pairs through a double rotating pair connecting rod; The V-shaped vertices of the remaining three rotating pair V-shaped connecting rods are hinged to the shaft holes at one end of the adjacent three rotating pairs through the double rotating pair connecting rods.

3. The multi-bolt synchronous tightening device according to claim 1, characterized in that The adjustable bolt fixing mechanism is a sleeve-shaped structure. The bottom and back of the sleeve are fixed to the axle of each output wheel. Multiple elastic columns are set at the bottom of the sleeve parallel to the sleeve wall. The multiple elastic columns are evenly distributed along the circumference of the sleeve and arranged in multiple circles at intervals. The central elastic column is configured to be compressed when subjected to pressure from foreign objects invading toward the bottom cover, while the peripheral elastic columns remain unchanged to clamp the foreign objects.

4. The multi-bolt synchronous tightening device according to claim 1, characterized in that The elastic column is a fixed cylinder connected to the bottom of the sleeve through a spring.

5. The multi-bolt synchronous tightening device according to claim 1, characterized in that The foreign objects are bolts with different shaft diameters.

6. The multi-bolt synchronous tightening device according to claim 1, characterized in that The end of the power input shaft is configured as a pointed or flat head suitable for various electric torque wrenches or manual torque wrenches to connect to an external power device.

7. The multi-bolt synchronous tightening device according to claim 1, characterized in that The transmission mechanism and the shaft diameter changing connecting rod mechanism are installed in the fixed cavity, and the adjustable bolt fixing mechanism extends from the empty slot of the fixed cavity and moves along the empty slot.

8. The multi-bolt synchronous tightening device according to claim 1, characterized in that The fixed cavity comprises an upper cover and a lower bottom which are buckled together, and a radius scale is provided at the junction of the upper cover or the lower bottom and is associated with the empty slot.

9. The multi-bolt synchronous tightening device according to claim 1, characterized in that The number of the planetary gears, output gears and universal sleeves is the same, which is 3-6.

10. A method for synchronously tightening multiple bolts, using the multi-bolt synchronous tightening device described in any one of claims 1 to 9 to simultaneously fix multiple bolts, adjusting the distribution radius of multiple adjustable bolt fixing mechanisms through an axial diameter changing connecting rod mechanism, and transmitting torque to the multiple adjustable bolt fixing mechanisms through a transmission mechanism to clamp the bolts.

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