Air conditioner air pipe flange bolt synchronous tightening device

Abstract

The invention discloses an air conditioner air pipe flange bolt synchronous tightening device, and relates to the field of mechanical and electrical installation, and the technical scheme is that the air conditioner air pipe flange bolt synchronous tightening device comprises a bottom plate, two transverse moving guide rails are fixedly arranged on the bottom plate, a sliding frame is arranged on the transverse moving guide rails in a sliding mode, a fixing frame is further fixedly arranged on the bottom plate, and the upper surface of the fixing frame is flush with the upper surface of the sliding frame; sliding rails are fixedly arranged on the sliding frame and the fixed frame, two sliding blocks are arranged on each sliding rail in a sliding mode, and the two sliding blocks on the same side are connected through a connecting frame; the sliding blocks in sliding connection with the fixing frame are each provided with a set of bolt fastening unit, and the sliding blocks in sliding connection with the sliding frame are each provided with a set of nut fastening unit. The bolt tightening device has the beneficial effects that multiple bolts can be synchronously tightened, compared with traditional manual one-by-one operation, the mounting time is greatly shortened, and the working efficiency is improved by multiple times; the device can adapt to air conditioner air pipe flanges of different specifications and is high in universality.

Description

Technical Field

[0001] The present invention relates to the field of mechanical and electrical installation, and particularly to a device for synchronously tightening bolts of an air-conditioning duct flange. Background Art

[0002] Ventilation ducts in buildings are metal or non-metal ducts for ventilation and air-conditioning projects in industrial and civil buildings suspended at the top of the space. A ventilation duct is a structure for air circulation. Its structure is composed of several cylindrical segments spliced together, and most of the connection positions adopt a two-flange structure and are fastened through fasteners.

[0003] However, traditional bolt tightening operations mainly rely on manual operation by workers. Workers need to hold tools and tighten bolts one by one. This method is not only inefficient but also extremely labor-consuming for workers. Moreover, due to the large number of bolts, the traditional operation method has low construction efficiency, seriously affecting the overall construction progress of engineering projects. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a device for synchronously tightening bolts of an air-conditioning duct flange.

[0005] The technical solution is as follows: It includes a bottom plate, on which two transverse guide rails are fixedly arranged. A sliding frame is slidably arranged on the transverse guide rails. A fixed frame is also fixedly arranged on the bottom plate, and the upper surfaces of the fixed frame and the sliding frame are flush. Sliding rails are fixedly arranged on both the sliding frame and the fixed frame. Two sliders are slidably arranged on each sliding rail, and two sliders on the same side are connected by a connecting frame. A set of bolt tightening units are respectively arranged on the sliders slidably connected to the fixed frame, and a set of nut tightening units are respectively arranged on the sliders slidably connected to the sliding frame. The bolt tightening units and nut tightening units on the same side are arranged oppositely.

[0006] Preferably, both the bolt tightening unit and the nut tightening unit include vertical frames fixedly arranged on the sliders. A plurality of lifting bases are slidably arranged on each vertical frame, and a mounting seat is fixedly arranged on each lifting base. A sleeve column is fixedly arranged on each mounting seat located on the fixed frame, and a bolt sleeve is detachably arranged on the sleeve column. A sleeve column is rotatably arranged on each mounting seat located on the sliding frame, and a nut sleeve is detachably arranged on the sleeve column. The bolt sleeve and the nut sleeve are arranged oppositely.

[0007] Preferably, an adjusting rod is rotatably arranged in the middle of the vertical frame, a thread is arranged at the lower end of the adjusting rod, and the thread of the adjusting rod is in threaded connection with the lowermost lifting base; A vertical chute is formed in the vertical frame, a convex platform is fixedly arranged on one side of the lifting base away from the mounting seat, and the convex platform slides in the chute; Two connecting rods are rotatably arranged on each convex platform, the middle of the connecting rod is rotatably connected with the convex platform, and the two ends of the connecting rod are respectively rotatably connected with the connecting rods on the adjacent lifting bases; One short connecting rod is rotatably arranged on each of the two lowermost connecting rods, and the movable ends of the two short connecting rods are rotatably connected to each other and rotatably connected to the lower end of the vertical frame.

[0008] Preferably, an L-shaped mounting plate is fixedly arranged on each mounting seat located on the sliding frame, one end of the mounting plate is fixedly connected with the mounting seat, and the other end is rotatably provided with a driving bevel gear; A driven bevel gear is also rotatably arranged on the mounting seat, the driven bevel gear is coaxially fixed with the sleeve column, and the driving bevel gear and the driven bevel gear are meshed; The plurality of driving bevel gears are linked through a transmission rod, a transmission rod motor is fixedly arranged at the lower end of the vertical frame, and the motor shaft of the transmission rod motor is coaxially fixed with the transmission rod.

[0009] Preferably, the length of the nut sleeve is greater than that of the bolt sleeve, a magnet is fixedly arranged at one end of the nut sleeve close to the open end, a through hole is arranged in the middle of the magnet, and the diameter of the through hole is greater than the diameter of the installed bolt; A magnet is arranged in the bolt sleeve.

[0010] Preferably, a screw rod is rotatably arranged in the middle of the bottom plate, the screw rod is in threaded connection with the sliding frame, a transverse movement motor is also fixedly arranged in the middle of the bottom plate, and the motor shaft of the transverse movement motor is coaxially fixed with the screw rod.

[0011] Preferably, a handle is fixedly arranged on one side of the bottom plate away from the sliding frame and the fixed frame, two control switches are arranged on the handle, and each control switch controls the transverse movement motor and the transmission shaft motor to work respectively.

[0012] Preferably, the connecting frame includes a fixed part fixedly arranged on one of the sliders, a telescopic part is sleeved in the fixed part, and the telescopic part is fixedly connected with the other slider.

[0013] Preferably, scale lines are arranged at the lower part of the vertical frame, and pointers are fixedly arranged on the two lowermost lifting bases respectively.

[0014] The beneficial effects brought by the technical solution provided by the embodiments of the present invention are as follows: It can achieve synchronous tightening of multiple bolts, greatly shortening the installation time compared with the traditional manual operation one by one, and the working efficiency is increased by several times; it can adapt to air-conditioning duct flanges of different specifications, with strong versatility; moreover, the operation is simple, reducing the labor intensity of workers. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the usage state of the embodiments of the present invention.

[0016] Figure 2 It is a schematic diagram of the overall structure of the embodiments of the present invention.

[0017] Figure 3 It is a schematic diagram of the bolt tightening unit and the nut tightening unit of the embodiments of the present invention Figure 1 .

[0018] Figure 4 It is a schematic diagram of the bolt tightening unit and the nut tightening unit of the embodiments of the present invention Figure 2 .

[0019] Figure 5 It is a schematic diagram of two opposite lifting bases, a transmission rod motor, etc. of the embodiments of the present invention.

[0020] Figure 6 It is an exploded schematic diagram of a sleeve column, a bolt sleeve, a nut sleeve, etc. of the embodiments of the present invention.

[0021] Figure 7 It is a schematic diagram of the bottom plate and the sliding frame of the embodiments of the present invention.

[0022] Among them, the reference numerals are: 1, bottom plate; 2, transverse movement guide rail; 3, sliding frame; 4, fixed frame; 5, slide rail; 6, slider; 7, connecting frame; 8, bolt tightening unit; 9, nut tightening unit; 10, vertical frame; 11, lifting base; 12, mounting seat; 13, sleeve column; 14, bolt sleeve; 15, nut sleeve; 16, adjusting rod; 17, connecting rod; 18, short connecting rod; 19, mounting plate; 20, driving bevel gear; 21, driven bevel gear; 22, transmission rod; 23, transmission rod motor; 24, screw rod; 25, transverse movement motor; 26, handle; 27, air-conditioning duct. Detailed Embodiments

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0027] Embodiment 1 Referring to Figures 1 to 7 , the present invention provides a device for synchronously tightening bolts of an air-conditioning duct flange, which includes a bottom plate 1. Two transverse guide rails 2 are fixedly arranged on the bottom plate 1. A sliding frame 3 is slidably arranged on the transverse guide rails 2. A fixed frame 4 is also fixedly arranged on the bottom plate 1, and the upper surfaces of the fixed frame 4 and the sliding frame 3 are flush; Sliding rails 5 are fixedly arranged on both the sliding frame 3 and the fixed frame 4. Two sliders 6 are slidably arranged on each sliding rail 5. The two sliders 6 on the same side are connected by a connecting frame 7; A threaded hole is also arranged on each slider 6, and a limit bolt is threadedly connected in the threaded hole. The connecting frame 7 can enable the two sliders 6 to slide synchronously. By adjusting the position of the slider 6, the bolt tightening unit 8 and the nut tightening unit 9 are respectively aligned with the corresponding bolts and nuts on the duct flange. After adjustment, by tightening the limit bolt, the slider 6 is fixed on the sliding rail 5 to prevent it from shifting during the operation; A set of bolt tightening units 8 are respectively arranged on the sliders 6 slidably connected to the fixed frame 4, and a set of nut tightening units 9 are respectively arranged on the sliders 6 slidably connected to the sliding frame 3. The bolt tightening units 8 and the nut tightening units 9 on the same side are arranged oppositely.

[0028] Before use, first, according to the size of the air-conditioning duct 27, by moving the position of the slider 6, make the distance between the bolt fastening units 8 on both sides and the nut fastening units 9 correspond to the distance between the flange holes on both sides of the air-conditioning duct 27. Place the bolts on the bolt fastening units 8 respectively, and place the nuts on the nut fastening units 9 respectively. By moving the sliding frame 3, make the nut fastening unit 9 approach the bolt fastening unit 8, and synchronously tighten the flange bolts of the air-conditioning duct 27 through the bolt fastening unit 8 and the nut fastening unit 9.

[0029] Both the bolt fastening unit 8 and the nut fastening unit 9 include a vertical frame 10 fixedly arranged on the slider 6. A plurality of lifting bases 11 are slidably arranged on each vertical frame 10, and a mounting seat 12 is fixedly arranged on each lifting base 11. The vertical frames 10, the lifting bases 11 and the mounting seats 12 on the two sliders 6 on the same slide rail 5 are arranged oppositely. Since the sizes of the air-conditioning ducts 27 of different specifications are different, the distances between the corresponding bolt mounting holes are also different. By adjusting the position of the lifting base 11 on the vertical frame 10, the bolts and nuts can accurately align with the mounting holes of the air-conditioning duct 27. A sleeve column 13 is fixedly arranged on each mounting seat 12 located on the fixed frame 4, and a bolt sleeve 14 is detachably arranged on the sleeve column 13. A sleeve column 13 is rotatably arranged on each mounting seat 12 located on the sliding frame 3, and a nut sleeve 15 is detachably arranged on the sleeve column 13. The bolt sleeve 14 and the nut sleeve 15 are arranged oppositely.

[0030] According to the specifications of the bolts and nuts on the flange of the air-conditioning duct 27, select the suitable bolt sleeve 14 and nut sleeve 15, and install them on the corresponding sleeve columns 13 respectively. The bolt sleeve 14 is installed on the sleeve column 13 of the mounting seat 12 on the fixed frame 4, and the nut sleeve 15 is installed on the sleeve column 13 of the mounting seat 12 on the sliding frame 3, ensuring that the bolt sleeve 14 and the nut sleeve 15 are arranged oppositely.

[0031] The bolt sleeve 14 and the nut sleeve 15 on the sleeve column 13 are both detachably arranged. When encountering the flange bolts and nuts of the air-conditioning ducts 27 of different specifications, the sleeves can be replaced conveniently and quickly, enhancing the versatility of the device and making it applicable to the installation work of various different specifications of air ducts.

[0032] An adjusting rod 16 is rotatably arranged in the middle of the vertical frame 10. The lower end of the adjusting rod 16 is provided with threads, and the threads of the adjusting rod 16 are threadedly connected to the lowermost lifting base 11. A knob is coaxially fixedly arranged at the upper end of the adjusting rod 16. A vertical chute is provided on the upright frame 10. A boss is fixedly arranged on the side of the lifting base 11 facing away from the mounting base 12, and the boss slides within the chute; Two connecting rods 17 are rotatably arranged on each boss. The middle of the connecting rod 17 is rotatably connected to the boss, and the two end portions of the connecting rod 17 are respectively rotatably connected to the connecting rods 17 on the adjacent lifting bases 11; A short connecting rod 18 is rotatably arranged on each of the two connecting rods 17 at the lowermost end. The movable ends of the two short connecting rods 18 are rotatably connected to each other and rotatably connected to the lower end of the upright frame 10.

[0033] Before preparing to tighten the flange bolts of the air-conditioning duct 27, first observe the distribution spacing of the mounting holes on the air-conditioning duct 27 on the duct flange. If it is necessary to adjust the spacing between the lifting bases 11, by rotating the knob, the knob drives the adjusting rod 16 to rotate. Since the lower end of the adjusting rod 16 is threadedly connected to the lowermost lifting base 11, when the adjusting rod 16 rotates, the lowermost lifting base 11 will move up and down along the upright frame 10; When the lowermost lifting base 11 moves, the connecting rods 17 rotatably arranged on its boss will drive the connecting rods 17 on the adjacent lifting bases 11 to move. Because the middle of the connecting rod 17 is rotatably connected to the boss and the two ends are respectively rotatably connected to the connecting rods 17 on the adjacent lifting bases 11, under the drive of the movement of the lowermost lifting base 11, each lifting base 11 will be linked in sequence and move up or down simultaneously as required, so that the mounting base 12 and its corresponding sleeve column 13 and sleeve spacing on each lifting base 11 are adjusted to adapt to the mounting holes with different spacings; When the lifting base 11 is adjusted to the appropriate position, stop rotating the knob. At this time, the adjusting rod 16 no longer rotates, and the position of the lowermost lifting base 11 is fixed. Due to the linkage structure of the connecting rod 17, the other lifting bases 11 are also fixed at their corresponding positions, ensuring that during the subsequent tightening operation, the bolts and nuts can be stably aligned with the mounting holes of the duct flange.

[0034] By rotating the knob, the spacing between the lifting bases 11 can be easily adjusted to adapt to the different spacings of the mounting holes on the flanges of air-conditioning ducts 27 with different specifications, greatly improving the versatility and application range of the device. There is no need to replace different devices for flanges with different spacings, reducing the usage cost.

[0035] With the linkage design of the connecting rod 17, only by adjusting the lowermost lifting base 11, the other lifting bases 11 can be synchronously linked and adjusted. The operation is simple and fast, reducing the cumbersome process of individually adjusting the position of each lifting base 11 and improving the work efficiency; at the same time, this linkage structure can ensure that the spacing adjustment between each lifting base 11 is uniform, making the force on the sleeve more uniform during the tightening process and improving the tightening quality.

[0036] On each mounting base 12 located on the sliding carriage 3, an L-shaped mounting plate 19 is fixedly arranged. One end of the mounting plate 19 is fixedly connected to the mounting base 12, and the other end rotatably arranges a driving bevel gear 20. A driven bevel gear 21 is also rotatably arranged on the mounting base 12. The driven bevel gear 21 is coaxially fixed with the sleeve column 13, and the driving bevel gear 20 and the driven bevel gear 21 are meshed. Multiple driving bevel gears 20 are linked by a transmission rod 22. The driving bevel gear 20 is radially fixed and circumferentially slidable relative to the transmission rod 22. The characteristic that the driving bevel gear 20 is radially fixed and circumferentially slidable relative to the transmission rod 22 enables the transmission system to still work normally when adjusting the position of the lifting base 11 according to the flange bolt spacing of different air-conditioning ducts 27, and will not affect power transmission and synchronous tightening functions due to position adjustment. This design enhances the adaptability of the device to the flanges of various specifications of air-conditioning ducts 27, improves the versatility of the device, and reduces the use cost. A transmission rod motor 23 is fixedly arranged at the lower end of the vertical frame 10, and the motor shaft of the transmission rod motor 23 is coaxially fixed with the transmission rod 22.

[0037] When the transmission rod motor 23 is turned on, the motor shaft drives the transmission rod 22 to rotate. Since the driving bevel gear 20 is radially fixed and circumferentially slidable relative to the transmission rod 22, the rotation of the transmission rod 22 can drive all the driving bevel gears 20 to rotate synchronously. Because the driven bevel gear 21 is coaxially fixed with the sleeve column 13, the rotation of the driven bevel gear 21 will cause the sleeve column 13 to drive the nut sleeve 15 to rotate, thereby tightening the nut. In this process, the meshing of the driving bevel gear 20 and the driven bevel gear 21, on the one hand, provides additional power support for the rotation of the driven bevel gear 21, and on the other hand, can also ensure the smoothness of the rotation of the driven bevel gear 21. As the nut sleeve 15 rotates, the nut is gradually tightened, and at the same time, the bolt sleeve 14 on the fixed frame 4 cooperates to complete the synchronous fastening of the bolt and the nut.

[0038] By using the transmission rod 22 to connect multiple driving bevel gears 20, the synchronous rotation of multiple nut sleeves 15 can be realized. Compared with the traditional method of tightening nuts one by one, the tightening efficiency of the flange bolts of the air-conditioning duct 27 is greatly improved, the installation time is significantly shortened, and the overall working efficiency is enhanced.

[0039] The length of the nut sleeve 15 is greater than that of the bolt sleeve 14. A magnet is fixedly arranged at one end of the nut sleeve 15 near the open end. A through hole is arranged in the middle of the magnet, and the diameter of the through hole is greater than the diameter of the installed bolt. A magnet is arranged inside the bolt sleeve 14.

[0040] Before starting the work of tightening the flange bolts of the air duct 27, select the appropriate bolt socket 14 and nut socket 15 according to the specifications of the mounting holes on the air duct flange, and install them on the corresponding socket columns 13 respectively. The magnets on the nut socket 15 and bolt socket 14 can automatically adsorb the nuts and bolts. The nuts and bolts are adsorbed by magnetic force and firmly fixed in the bolt socket 14 and nut socket 15 to prevent the bolts and nuts from falling during the operation.

[0041] A screw rod 24 is rotatably arranged in the middle of the bottom plate 1. The screw rod 24 is threadedly connected to the sliding frame 3. A transverse movement motor 25 is also fixedly arranged in the middle of the bottom plate 1, and the motor shaft of the transverse movement motor 25 is fixedly coaxial with the screw rod 24.

[0042] Since the distance between the bolt tightening unit 8 and the nut tightening unit 9 is relatively large in the initial state and the nut cannot be installed on the bolt, when using this device, first move the device so that the bolt is inserted into the mounting hole of the air duct flange. By starting the transverse movement motor 25, since the motor shaft of the transverse movement motor 25 is fixedly coaxial with the screw rod 24, the motor will drive the screw rod 24 to rotate after starting. The screw rod 24 is threadedly connected to the sliding frame 3. When the screw rod 24 rotates, the sliding frame 3 will perform a transverse movement along the axial direction of the screw rod 24 on the transverse movement guide rail 2, making the nut gradually approach the bolt until the nut and the bolt are tightened. Using the transverse movement motor 25 to drive the screw rod 24 to rotate to drive the sliding frame 3 to move, the operator only needs to control the start, stop and forward and reverse rotation of the motor to easily complete the position adjustment of the sliding frame 3, without manually pushing the sliding frame 3 laboriously. This greatly simplifies the operation process, reduces the labor intensity of the operator and improves the work efficiency.

[0043] A handle 26 is fixedly arranged on one side of the bottom plate 1 away from the sliding frame 3 and the fixed frame 4. The handle 26 is provided with two control switches, and each control switch controls the transverse movement motor 25 and the transmission shaft motor to work respectively.

[0044] The operator starts the transverse movement motor 25 through the control switch on one side of the handle 26. Since the motor shaft of the transverse movement motor 25 is fixedly coaxial with the screw rod 24, the motor drives the screw rod 24 to rotate. The screw rod 24 is threadedly connected to the sliding frame 3, so that the sliding frame 3 performs a transverse movement on the transverse movement guide rail 2. The operator can accurately adjust the distance between the sliding frame 3 and the fixed frame 4 by controlling the forward and reverse rotation of the transverse movement motor 25 according to the actual width of the flange of the air duct 27. After adjusting to the appropriate position, the transverse movement motor 25 is turned off through the control switch to fix the sliding frame 3.

[0045] After the position of the sliding carriage 3 is adjusted, the operator starts the drive shaft motor by operating the control switch of the drive shaft motor on the other side of the handle 26. The drive shaft motor drives the drive rod 22 to rotate, and the drive rod 22 drives a plurality of driven bevel gears 21 to rotate synchronously. The driven bevel gears 21 are coaxially fixed with the sleeve column 13, so that the nut sleeve 15 rotates. During the rotation of the nut sleeve 15, the sliding carriage 3 is driven by the transverse movement motor 25 to move towards the fixed frame 4, so that the nut gradually approaches the bolt until the nut is tightened with the bolt.

[0046] The two control switches provided on the handle 26 respectively control the operation of the transverse movement motor 25 and the drive shaft motor. During the operation, the operator only needs to hold the handle 26 to conveniently control the start and stop of the motors. This design makes the operation more centralized and convenient, reduces the operation steps and time, and improves the work efficiency.

[0047] When the present invention is used, before use, first, according to the size of the air-conditioning duct 27, by moving the position of the slider 6, the distance between the two bolt fastening units 8 and the nut fastening unit 9 on both sides is made to correspond to the distance between the flange holes on both sides of the air-conditioning duct 27. The bolts are respectively placed on the bolt fastening units 8, and the nuts are placed on the nut fastening unit 9. By moving the sliding carriage 3, the nut fastening unit 9 is moved closer to the bolt fastening unit 8, and the flange bolts of the air-conditioning duct 27 are synchronously tightened through the bolt fastening unit 8 and the nut fastening unit 9.

[0048] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air-conditioning duct flange bolt synchronous tightening device, characterized in that, It includes a bottom plate (1), on which two transverse guide rails (2) are fixedly arranged. A sliding frame (3) is slidably arranged on the transverse guide rails (2). A fixed frame (4) is also fixedly arranged on the bottom plate (1), and the upper surfaces of the fixed frame (4) and the sliding frame (3) are flush. Sliding rails (5) are fixedly arranged on both the sliding frame (3) and the fixed frame (4). Two sliders (6) are slidably arranged on each sliding rail (5), and two sliders (6) on the same side are connected by a connecting frame (7). A set of bolt fastening units (8) are respectively arranged on the sliders (6) slidably connected to the fixed frame (4), and a set of nut fastening units (9) are respectively arranged on the sliders (6) slidably connected to the sliding frame (3). The bolt fastening units (8) and the nut fastening units (9) on the same side are arranged oppositely.

2. The synchronous tightening device for the flange bolts of the air-conditioning duct according to claim 1, characterized in that Both the bolt fastening unit (8) and the nut fastening unit (9) include upright frames (10) fixedly arranged on the sliders (6). A number of lifting bases (11) are slidably arranged on each upright frame (10), and a mounting seat (12) is fixedly arranged on each lifting base (11). A sleeve column (13) is fixedly arranged on each mounting seat (12) located on the fixed frame (4), and a bolt sleeve (14) is detachably arranged on the sleeve column (13). A sleeve column (13) is rotatably arranged on each mounting seat (12) located on the sliding frame (3), and a nut sleeve (15) is detachably arranged on the sleeve column (13). The bolt sleeve (14) and the nut sleeve (15) are arranged oppositely.

3. The air-conditioning duct flange bolt synchronous tightening device according to claim 2, characterized in that An adjusting rod (16) is rotatably arranged in the middle of the upright frame (10). The lower end of the adjusting rod (16) is threaded, and the thread of the adjusting rod (16) is threadedly connected to the lowermost one of the lifting bases (11). A vertical chute is opened on the upright frame (10). A convex platform is fixedly arranged on the side of the lifting base (11) facing away from the mounting seat (12), and the convex platform slides in the chute. Two connecting rods (17) are rotatably arranged on each convex platform. The middle of the connecting rod (17) is rotatably connected to the convex platform, and the two ends of the connecting rod (17) are respectively rotatably connected to the connecting rods (17) on the adjacent lifting bases (11). A short connecting rod (18) is rotatably arranged on each of the two lowermost connecting rods (17). The movable ends of the two short connecting rods (18) are rotatably connected to each other and rotatably connected to the lower end of the upright frame (10).

4. The air-conditioning duct flange bolt synchronous tightening device according to claim 3, characterized in that, An L-shaped mounting plate (19) is fixedly arranged on each mounting seat (12) located on the sliding frame (3). One end of the mounting plate (19) is fixedly connected to the mounting seat (12), and the other end rotatably arranges a driving bevel gear (20). A driven bevel gear (21) is also rotatably arranged on the mounting seat (12). The driven bevel gear (21) is coaxially fixed to the sleeve column (13), and the driving bevel gear (20) and the driven bevel gear (21) are meshed. The plurality of active bevel gears (20) are linked via a transmission rod (22); a transmission rod motor (23) is fixedly disposed at the lower end of the stand (10); and a motor shaft of the transmission rod motor (23) is coaxially fixed to the transmission rod (22).

5. The air-conditioning duct flange bolt synchronous tightening device according to claim 2, wherein, The length of the nut sleeve (15) is greater than the length of the bolt sleeve (14); a magnet is fixedly arranged at one end of the nut sleeve (15) close to the open end; a through hole is arranged in the middle of the magnet; and a diameter of the through hole is greater than a diameter of the installed bolt; A magnet is arranged inside the bolt sleeve (14).

6. The synchronous tightening device for the bolts of the air-conditioning duct flange according to claim 4, characterized in that, A screw rod (24) is rotatably arranged in the middle of the base plate (1), and the screw rod (24) is threadedly connected to the sliding frame (3). A transverse motor (25) is also fixedly arranged in the middle of the base plate (1), and the motor shaft of the transverse motor (25) is coaxially fixed with the screw rod (24).

7. The synchronous tightening device for the bolts of the air-conditioning duct flange according to claim 6, characterized in that, A handle (26) is fixedly provided on one side of the bottom plate (1) away from the sliding frame (3) and the fixed frame (4), and the handle (26) is provided with two control switches, each of which controls the operation of the transverse movement motor (25) and the transmission shaft motor respectively.

8. The synchronous tightening device for the bolts of the air-conditioning duct flange according to claim 1, characterized in that, The connecting frame (7) comprises a fixing portion fixedly arranged on one of the sliders (6), a telescopic portion being sleeved inside the fixing portion, and the telescopic portion being fixedly connected to the other slider (6).

9. The synchronous tightening device for air-conditioning duct flange bolts according to claim 2, characterized in that, A scale line is arranged at the bottom of the stand (10), and pointers are fixedly arranged on the two lifting bases (11) located below.

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