An air duct bolt tightening device for narrow spaces in subway stations

Abstract

The present invention relates to the technical field of auxiliary tools for subway construction, and discloses a device for tightening air duct screws for use in confined spaces in subway stations. The device comprises an electric drill body, a flexible shaft mounted on the power output end of the electric drill body, a torque sensor fixedly mounted at the connection between the electric drill body and the flexible shaft, a corrugated protective tube sheathed around the flexible shaft, a rotary tube rotatably connected to the front of the flexible shaft, the lateral surface of the rotary tube rotatably connected to the corrugated protective tube, two symmetrically arranged mounting positions provided at eccentric positions on the surface of the rotary tube, a screw seat rotatably connected to the inner wall of one mounting position, a collection camera arranged parallel to the screw seat fixedly mounted on the surface of the other mounting position, and a driven gear fixedly mounted on the lateral surface of the flexible shaft. By providing the flexible shaft, corrugated protective tube, and screw seat, the present invention enables the device to efficiently complete the tightening of air duct connecting bolts or screws in confined spaces in subway stations.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary tools for subway construction, and more particularly to an air duct bolt tightening device for a narrow space in a subway station. Background Art

[0002] like Figure 14 As shown, the traditional vertical support columns are eliminated in the subway interior space 005, and are replaced by diagonal support columns 004. A triangular narrow space 007 is formed between the diagonal support columns 004 and the walls and floor slabs 006. The air duct 001 is installed in this triangular narrow space 007, so that the clearance height of the subway interior space 005 is higher, preventing people from feeling depressed inside the subway, and providing a wide and beautiful view, making people feel more comfortable. The subway air duct 001 made of aluminum alloy is very long and is installed section by section. The air ducts 001 are connected to each other through flanges 002. A circle of bolts 003 surrounds the flanges 002. The bolts 003 are generally hexagonal bolts, octagonal bolts, etc. Nowadays, bolts are not tightened manually, but are tightened with electric screwdrivers and electric drills. However, in this narrow triangular space 007, and the air duct 001 has a certain length, it is difficult for people to move and it is difficult to drive the bolts into place, which leads to low bolt tightening efficiency. In addition, the existing tightening device is not convenient for online adjustment of the spatial operating angle and spatial operating position of the air duct screw tightening device according to the position of the bolt when tightening the bolt. On the other hand, it is not convenient to accurately control the tightening force of the tightening device on the bolt. Based on this, the present invention provides an air duct bolt tightening device for a narrow space in a subway station to solve the problems raised in the above background technology. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the present invention provides an air duct bolt tightening device for a narrow space in a subway station, which has the advantage of efficiently completing the tightening operation of air duct connecting bolts or screws in a narrow space in a subway station.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a device for tightening air duct bolts for use in a narrow space in a subway station, comprising an electric drill body, a flexible shaft installed at the power output end of the electric drill body, a torque sensor fixedly installed at the connection between the electric drill body and the flexible shaft, a corrugated protective tube sheathed on the circumferential side of the flexible shaft, a rotationally connected indexing rotary tube at the front of the flexible shaft, a rotationally connected circumferential side of the indexing rotary tube and the corrugated protective tube, two symmetrically arranged mounting positions are provided at eccentric positions on the surface of the indexing rotary tube, a screw seat is rotationally connected to the inner wall of one mounting position, and a collection camera arranged parallel to the screw seat is fixedly installed on the surface of the other mounting position, a driven gear fixedly installed on the circumferential side of the flexible shaft, a differential gear transmission-connected to the driven gear fixedly installed on the circumferential side of the screw seat, an air drive assembly transmission-connected to the indexing rotary tube and a telescopic arm assembly for universally telescopic positioning of the corrugated protective tube are respectively installed on the outside of the electric drill body, a central control host is magnetically attracted to the surface of the electric drill body, and ports of the torque sensor and the collection camera are electrically connected to the central control host.

[0005] Preferably, the end of the torque sensor and the interior of the screw seat are fixedly provided with a magnetic card slot, and the tail end of the flexible shaft is fixedly installed with a transmission rod that is magnetically attracted to and transmits to the magnetic card slot. The cross-sections of the transmission rod and the magnetic card slot are both regular polygons, and the inner wall of the screw seat is connected to the screw head through the magnetic card slot.

[0006] Furthermore, an image recognition module electrically connected to the acquisition camera is built into the interior of the central control host, and a display screen and an indicator light are installed on the surface of the central control host. The ports of the display screen and the indicator light are electrically connected to the image recognition module, and a group of fill lights distributed in a circular array are installed on the surface of the acquisition camera.

[0007] Furthermore, the air drive assembly includes a pneumatic cavity provided between the bellows and the indexing rotary tube, and pneumatic blades fixed to the peripheral side of the indexing rotary tube and slidingly fitted with the pneumatic cavity. A sealing spacer ring rotatably connected to the pneumatic cavity is fixedly installed on the peripheral side of the indexing rotary tube, a disc spring is installed between the relative surfaces of the sealing spacer ring and the bellows, a pneumatic tube connected to the pneumatic cavity is fixedly installed on the surface of the bellows, and the air outlet direction of the pneumatic tube is opposite to the pneumatic blades. A normal pressure hole connected to the pneumatic cavity is provided inside the bellows, and the port of the pneumatic tube is connected to an inflation balloon, and a one-way air inlet valve is installed at the bottom end of the inflation balloon. A one-way air outlet valve and a pressure relief valve are sequentially provided at the connection between the inflation balloon and the pneumatic tube.

[0008] Furthermore, the radius of the driven gear is 2 to 4 times the radius of the differential gear, the flexible shaft is a coil spring, and the corrugated protective tube is made of plastic rubber.

[0009] Furthermore, the telescopic arm assembly includes a positioning arm and two symmetrically arranged rotation rings that are sleeved on the outside of the corrugated protective tube. The inner wall of the positioning arm is slidingly connected to the extension arm, and the inner wall of the positioning arm is rotatably connected to the outer screw tube. The circumferential side of the outer screw tube is transmission-connected to the extension arm, and the inner wall of the outer screw tube is rotationally connected to the transmission shaft. The circumferential side of the transmission shaft is transmission-connected and slidingly matched with a sleeve, and the circumferential side of the sleeve is rotationally connected to the extension arm. The inner wall of the extension arm is rotatably connected to the rotating shaft, and the circumferential side of the rotating shaft is fixedly installed with a rotary arm. The bottom surfaces of the rotary arm and the positioning arm are respectively fixedly connected to the two rotation rings, and the rotating shaft is driven by the sleeve. The bottom surfaces of the positioning arm and the rotary arm are clamped with a group of tightening parts that cooperate with the corrugated protective tube.

[0010] Furthermore, the transmission shaft and the outer spiral tube are fixedly installed with transmission buttons on the peripheral side, the positioning arm is fixedly installed with a paddle on the peripheral side, the end of the sleeve is fixedly installed with a transmission bevel gear, and the peripheral side of the rotating shaft is fixedly installed with a driven bevel gear connected to the transmission bevel gear.

[0011] Furthermore, a transmission part is fixedly provided on the peripheral side surface of the transmission shaft, and a transmission groove with a tail end opening fixedly opened inside the sleeve and slidingly connected to the transmission part is provided. The cross sections of the transmission part and the transmission groove are both regular polygons.

[0012] Furthermore, the tightening member includes two symmetrically arranged clamps, a metal strap is connected between the relative surfaces of the two clamps, a group of positioning clamps are fixedly installed on the top surfaces of the two clamps, and the bottom surfaces of the rotary arm and the positioning arm are provided with several groups of regularly distributed positioning slots that are clamped with the positioning clamps.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention provides a flexible shaft, a corrugated protective tube, a screw seat and other structures, so that the device can efficiently complete the tightening operation of the air duct connecting bolts or screws in the narrow space of the subway station. When tightening the bolts or screws, the device facilitates the online multi-directional adjustment of the spatial working position and spatial working angle of the screw seat through the provision of the telescopic arm assembly, thereby effectively improving the operational flexibility of the device. On the other hand, the provision of the telescopic arm assembly facilitates the operation of the device in a narrow space. The provision of the telescopic arm assembly can accurately locate the position of the screw seat when the screw seat is working, thereby effectively ensuring the stability of the screw seat during operation.

[0015] 2. The present invention facilitates the cyclic switching of the acquisition camera and the screw seat position by setting the acquisition camera and the indexing rotary tube. By realizing the switchable effect of the acquisition camera and the screw seat position, the accuracy of the operation of the device is effectively improved. By setting the differential gear and the driven gear, the output speed of the flexible shaft to the screw seat can be increased exponentially, thereby improving the tightening efficiency of the air duct connecting bolts or screws. By setting the torque measuring structure of the torque sensor, the tightening strength of the air duct connecting bolts or screws can be accurately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an air duct bolt tightening device for a narrow space in a subway station according to the present invention;

[0017] Figure 2 For the present invention Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0018] Figure 3 For the present invention Figure 1 Schematic diagram of the local enlarged structure at B in the middle;

[0019] Figure 4 It is a structural schematic diagram of the rotary arm and the screw seat of the present invention;

[0020] Figure 5 For the present invention Figure 4 Schematic diagram of the local enlarged structure at C in the middle;

[0021] Figure 6 This is a schematic structural diagram of the inflation balloon and the pressure relief valve of the present invention;

[0022] Figure 7 Schematic diagram of the structure of the flexible shaft and the indexing coil of the present invention;

[0023] Figure 8 For the present invention Figure 7 Schematic diagram of the local enlarged structure at D in the middle;

[0024] Figure 9 Schematic diagram of the cross-sectional structure of the corrugated protective tube and the pneumatic tube of the present invention;

[0025] Figure 10 It is a schematic structural diagram of the metal strap and positioning arm of the present invention;

[0026] Figure 11 For the present invention Figure 10 Schematic diagram of the local enlarged structure at E in the middle;

[0027] Figure 12 It is a structural schematic diagram of the shaft sleeve and the transmission shaft of the present invention;

[0028] Figure 13This is a schematic structural diagram of the positioning post and metal strap of the present invention;

[0029] Figure 14 It is a structural diagram of the background technology of the present invention.

[0030] Figure: 1. Electric drill body; 2. Flexible shaft; 3. Torque sensor; 4. Bellows; 5. Rotary tube; 6. Screw seat; 7. Collection camera; 8. Driven gear; 9. Differential gear; 10. Central control host; 11. Extension arm; 12. Pneumatic chamber; 13. Pneumatic blade; 14. Sealing ring; 15. Coil spring; 16. Pneumatic tube; 17. Normal pressure hole; 18. Inflatable balloon; 19. Positioning arm; 2 0. External screw tube; 21. Drive shaft; 22. Bushing; 23. Rotating shaft; 24. Swing arm; 25. Drive button; 26. Pick; 27. Clamp; 28. Metal strap; 29. Positioning column; 30. Pressure relief valve; 31. Rotating ring; 001. Air duct; 002. Flange; 003. Bolt; 004. Diagonal brace; 005. Interior space of subway; 006. Floor; 007. Narrow triangular space. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figures 1 to 13 As shown, the present invention provides an air duct bolt tightening device for use in a narrow space of a subway station, comprising an electric drill body 1, a flexible shaft 2 being installed at the power output end of the electric drill body 1, and a torque sensor 3 being fixedly installed at the connection between the electric drill body 1 and the flexible shaft 2;

[0033] The torque sensor 3 is used to monitor the output torque value of the flexible shaft 2 in real time;

[0034] The flexible shaft 2 is a coil spring;

[0035] The circumferential side of the flexible shaft 2 is sleeved with a corrugated protective tube 4, which is made of plastic rubber. The front part of the flexible shaft 2 is rotatably connected to an indexing rotary tube 5, and the circumferential side of the indexing rotary tube 5 is rotatably connected to the corrugated protective tube 4. Two symmetrical mounting positions are provided on the eccentric position of the surface of the indexing rotary tube 5. The inner wall of one mounting position is rotatably connected to a screw seat 6, and the surface of the other mounting position is fixedly mounted with a collection camera 7 arranged parallel to the screw seat 6. A group of fill lights distributed in a circular array are installed on the surface of the collection camera 7.

[0036] A central control host 10 is magnetically attracted to the surface of the electric drill body 1 , and ports of the torque sensor 3 and the acquisition camera 7 are electrically connected to the central control host 10 .

[0037] The central control host 10 has an internal built-in image recognition module electrically connected to the acquisition camera 7. The surface of the central control host 10 is respectively installed with a display screen and an indicator light. The ports of the display screen and the indicator light are electrically connected to the image recognition module.

[0038] The image recognition module is an image recognition software that is equipped with an image recognition algorithm. When the acquisition camera 7 is working, the image data collected by the acquisition camera 7 is transmitted to the display screen in real time. The image recognition module uses the built-in image recognition and processing algorithm to identify the edge and axis position of the air duct connection bolt or screw. When the camera axis of the acquisition camera 7 is in a straight line with the axis of the air duct connection bolt or screw, the designated light lights up, thereby reminding the operator.

[0039] The image recognition module can be customized according to actual needs, and the acquisition camera 7 and torque sensor 3 can be customized or selected according to actual needs;

[0040] By means of the rotary structure of the indexing coil 5 and the symmetrical structure of the two mounting positions, the positions of the screw seat 6 and the acquisition camera 7 can be cyclically switched. By achieving the effect of the position switching of the screw seat 6 and the acquisition camera 7, the acquisition camera 7 can accurately locate the working position of the screw seat 6.

[0041] When it is necessary to tighten the bolts or screws connecting the air duct, first, by adjusting the position of the acquisition camera 7, the axis of the acquisition camera 7 is aligned with the bolts or screws connecting the air duct. At this time, the position and angle of the acquisition camera 7 are marked as the calibration position. After the acquisition camera 7 is aligned, the indexing tube 5 is rotated by the set angle, so that the screw head moves to the calibration position of the acquisition camera 7;

[0042] A driven gear 8 is fixedly mounted on the peripheral side of the flexible shaft 2, and a differential gear 9 connected to the driven gear 8 is fixedly mounted on the peripheral side of the screw seat 6;

[0043] The radius of the driven gear 8 is three times the radius of the differential gear 9;

[0044] By setting the radius difference between the driven gear 8 and the differential gear 9, the rotation speed of the flexible shaft 2 can be transmitted to the screwing head in multiples, thereby improving the tightening efficiency of the screwing head on bolts and screws;

[0045] The outside of the electric drill body 1 is respectively installed with an air drive assembly connected to the indexing rotary tube 5 and a telescopic arm assembly for universal telescopic positioning of the corrugated protective tube 4;

[0046] The end of the torque sensor 3 and the interior of the screw seat 6 are fixedly provided with a magnetic card slot, and the tail end of the flexible shaft 2 is fixedly provided with a transmission rod that is magnetically attracted to and transmits to the magnetic card slot. The cross-sections of the transmission rod and the magnetic card slot are both regular polygons.

[0047] The inner wall of the screw seat 6 is connected to a screw head through a magnetic card slot. The type and specification of the screw head can be customized according to actual needs.

[0048] By switching the specifications and types of the screw heads, the screw heads can be used to tighten air duct connecting bolts or screws of different specifications.

[0049] The air drive assembly includes a pneumatic chamber 12 defined between the bellows 4 and the indexing coil 5, and pneumatic blades 13 fixed to the circumferential side of the indexing coil 5 and slidingly engaged with the pneumatic chamber 12. A sealing ring 14 rotatably connected to the pneumatic chamber 12 is fixedly mounted on the circumferential side of the indexing coil 5, and a coil spring 15 is installed between the sealing ring 14 and the opposing surface of the bellows 4.

[0050] By setting the coil spring 15, the surface of the pneumatic blade 13 can automatically fit with the pneumatic cavity 12 when the pneumatic blade 13 is not under stress.

[0051] A pneumatic tube 16 connected to the pneumatic cavity 12 is fixedly installed on the surface of the corrugated protective tube 4. The air outlet direction of the pneumatic tube 16 is opposite to the pneumatic blades 13. A normal pressure hole 17 connected to the pneumatic cavity 12 is opened inside the corrugated protective tube 4. The port of the pneumatic tube 16 is connected to an inflatable balloon 18. A one-way air inlet valve is installed at the bottom end of the inflatable balloon 18. A one-way air outlet valve and a pressure relief valve 30 are sequentially provided at the connection between the inflatable balloon 18 and the pneumatic tube 16.

[0052] By setting a one-way air outlet valve, it is ensured that the gas of the inflated balloon 18 can only be fed into the pneumatic tube 16 in one direction;

[0053] By setting the pressure relief valve 30, the gas inside the pneumatic tube 16 can be quickly discharged to the outside;

[0054] By setting a one-way air inlet valve, it is ensured that external air can only be fed into the inflatable balloon 18 in one direction;

[0055] When the angle of the indexing coil 5 needs to be changed, the operator drives the inflation balloon 18, thereby causing the pneumatic tube 16 to send pressure into the pneumatic chamber 12. The pneumatic blades 13 rotate under pressure, and after the pneumatic blades 13 rotate, the original air inside the pneumatic chamber 12 is discharged through the normal pressure hole 17;

[0056] When the pneumatic blade 13 rotates to the set angle, it is automatically blocked and stops. When the indexing coil 5 needs to be reset, the pressure relief valve 30 opens, and the pneumatic blade 13 and the indexing coil 5 are automatically reset under the action of the coil spring 15.

[0057] The telescopic arm assembly includes a positioning arm 19 and two symmetrically arranged indexing rings 31 sleeved on the outside of the corrugated protective tube 4. The indexing rings 31 are arranged so that the layout position of the positioning arm 19 can be changed.

[0058] The inner wall of the positioning arm 19 is slidably connected to the extension arm 11, and the inner wall of the positioning arm 19 is rotatably connected to the outer screw tube 20. The peripheral side of the outer screw tube 20 is transmission-connected to the extension arm 11. The inner wall of the outer screw tube 20 is rotatably connected to the transmission shaft 21. The peripheral side of the transmission shaft 21 is transmission-connected and slidably fitted with a shaft sleeve 22;

[0059] The rotational connection between the outer spiral tube 20 and the positioning arm 19 and the rotational connection between the transmission shaft 21 and the outer spiral tube 20 are both provided with damping washers. By providing the damping washers, the angles of the outer spiral tube 20 and the transmission shaft 21 after rotation are effectively self-locked and self-braked.

[0060] The angle of the transmission shaft 21 is self-locked, thereby effectively self-locking the angle of the swing arm 24;

[0061] A transmission button 25 is fixedly mounted on the peripheral side of the transmission shaft 21 and the outer screw tube 20, and a paddle 26 is fixedly mounted on the peripheral side of the positioning arm 19;

[0062] By setting the paddle 26, the angle of the indexing ring 31 can be quickly changed;

[0063] A transmission part is fixedly provided on the peripheral side of the transmission shaft 21, and a transmission chute with an opening at the tail end fixedly opened inside the shaft sleeve 22 and slidably connected to the transmission part is provided. The cross-sections of the transmission part and the transmission chute are both regular polygons.

[0064] By setting the shaft sleeve 22 and the transmission shaft 21, the transmission shaft 21 can continuously and effectively transmit the shaft sleeve 22 during the position change of the extension arm 11;

[0065] The peripheral side surface of the shaft sleeve 22 is rotatably connected to the extension arm 11, and the inner wall of the extension arm 11 is rotatably connected to the rotating shaft 23. The peripheral side surface of the rotating shaft 23 is fixedly mounted with a rotary arm 24. The bottom surface of the rotary arm 24 and the positioning arm 19 are respectively fixedly connected to two indexing rings 31. The rotating shaft 23 is driven by the shaft sleeve 22. The end of the shaft sleeve 22 is fixedly mounted with a transmission bevel gear, and the peripheral side surface of the rotating shaft 23 is fixedly mounted with a driven bevel gear in transmission connection with the transmission bevel gear.

[0066] When the angle of the rotary arm 24 and the orientation angle of the flexible shaft 2 need to be changed, the orientation angle of the flexible shaft 2 and the acquisition camera 7 can be quickly changed by driving the transmission shaft 21;

[0067] The bottom surfaces of the positioning arm 19 and the rotary arm 24 are both clamped with a set of tightening pieces that cooperate with the corrugated protective tube 4.

[0068] The tightening piece includes two symmetrically arranged clamps 27, and a metal strap 28 is connected between the opposite surfaces of the two clamps 27. A group of positioning clamps 29 are fixedly installed on the top surfaces of the two clamps 27. The bottom surfaces of the rotary arm 24 and the positioning arm 19 are provided with multiple groups of regularly distributed positioning slots that are clamped with the positioning clamps 29.

[0069] The working principle and use process of the present invention:

[0070] This device is mainly suitable for tightening air duct connecting bolts or screws in the narrow space of subway stations. Before work, the operator selects a screw head of appropriate specifications according to the specifications of the air duct connecting bolts or screws and fixes the screw head to the screw seat 6. During operation, the operator holds the electric drill body 1, controls the angle of the electric drill body 1, sets the angle of the swing arm 24, and drives the air drive component to align the camera axis of the acquisition camera 7 with the axis of the air duct connecting bolt or screw. When the camera axis of the acquisition camera 7 is aligned with the axis of the air duct connecting bolt or screw, a designated light on the central control host 10 lights up, then reminds the operator. After the operator is reminded, the pressure relief valve 30 releases pressure, and the screw head moves to the acquisition position of the acquisition camera 7. Then, the operator applies force, and the flexible shaft 2 rotates, thereby tightening the air duct connecting bolt or screw. When the detection value of the torque sensor 3 reaches the set value, the central control host 10 automatically prompts with sound and light, and then completes the tightening operation of the single air duct connecting bolt or screw.

[0071] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for tightening air duct bolts in a narrow space of a subway station, comprising an electric drill body (1), characterized in that: The power output end of the electric drill body (1) is provided with a flexible shaft (2), a torque sensor (3) is fixedly installed at the connection between the electric drill body (1) and the flexible shaft (2), a corrugated protective tube (4) is sleeved on the peripheral side of the flexible shaft (2), a rotationally connected indexing rotary tube (5) is provided on the front of the flexible shaft (2), the peripheral side of the indexing rotary tube (5) is rotationally connected to the corrugated protective tube (4), and two symmetrically arranged mounting positions are provided on the eccentric position of the surface of the indexing rotary tube (5), the inner wall of one mounting position is rotationally connected to a screw seat (6), and the surface of the other mounting position is fixedly provided with a screw seat (6) connected to the screw seat (6). A collection camera (7) is arranged parallel to the screw seat (6), a driven gear (8) is fixedly mounted on the peripheral side of the flexible shaft (2), a differential gear (9) connected to the driven gear (8) is fixedly mounted on the peripheral side of the screw seat (6), an air drive assembly connected to the indexing rotary tube (5) and a telescopic arm assembly for universal telescopic positioning of the corrugated protective tube (4) are respectively mounted on the outside of the electric drill body (1), a central control host (10) is magnetically attracted to the surface of the electric drill body (1), and the ports of the torque sensor (3) and the collection camera (7) are both electrically connected to the central control host (10); The air drive assembly comprises a pneumatic cavity (12) provided between the bellows (4) and the indexing coil (5), and a pneumatic blade (13) fixed to the peripheral side of the indexing coil (5) and slidingly fitted with the pneumatic cavity (12). A sealing ring (14) rotatably connected to the pneumatic cavity (12) is fixedly installed on the peripheral side of the indexing coil (5). A coil spring (15) is installed between the relative surface of the sealing ring (14) and the bellows (4). The surface of the bellows (4) is fixedly installed with a A pneumatic tube (16) is connected to the pneumatic chamber (12), the air outlet direction of the pneumatic tube (16) is opposite to the pneumatic blades (13), the interior of the corrugated protective tube (4) is provided with a normal pressure hole (17) connected to the pneumatic chamber (12), the port of the pneumatic tube (16) is connected to the inflation balloon (18), the bottom end of the inflation balloon (18) is equipped with a one-way air inlet valve, and the connection point between the inflation balloon (18) and the pneumatic tube (16) is provided with a one-way air outlet valve and a pressure relief valve (30) in sequence.

2. The air duct bolt tightening device for a narrow space in a subway station according to claim 1, characterized in that: The end of the torque sensor (3) and the interior of the screw seat (6) are both fixedly provided with a magnetic card slot, and the tail end of the flexible shaft (2) is fixedly provided with a transmission rod that is magnetically attracted to and transmits to the magnetic card slot. The cross sections of the transmission rod and the magnetic card slot are both regular polygons, and the inner wall of the screw seat (6) is connected to a screw head through the magnetic card slot.

3. The air duct bolt tightening device for a narrow space in a subway station according to claim 2, characterized in that: An image recognition module electrically connected to the acquisition camera (7) is built into the central control host (10), a display screen and an indicator light are mounted on the surface of the central control host (10), ports of the display screen and the indicator light are electrically connected to the image recognition module, and a group of fill lights distributed in a circular array are mounted on the surface of the acquisition camera (7).

4. The air duct bolt tightening device for a narrow space in a subway station according to claim 3, characterized in that: The radius of the driven gear (8) is 2 to 4 times the radius of the differential gear (9), the flexible shaft (2) is a coil spring, and the corrugated protective tube (4) is made of plastic rubber.

5. The air duct bolt tightening device for a narrow space in a subway station according to claim 1, characterized in that: The telescopic arm assembly comprises a positioning arm (19) and two symmetrically arranged indexing rings (31) sleeved on the outside of the corrugated protective tube (4); the inner wall of the positioning arm (19) is slidably connected to the extension arm (11); the inner wall of the positioning arm (19) is rotatably connected to the outer spiral tube (20); the peripheral side surface of the outer spiral tube (20) is transmission-connected to the extension arm (11); the inner wall of the outer spiral tube (20) is rotationally connected to the transmission shaft (21); the peripheral side surface of the transmission shaft (21) is transmission-connected and slidably matched with a shaft sleeve ( 22), the peripheral side surface of the shaft sleeve (22) is rotatably connected to the extension arm (11), the inner wall of the extension arm (11) is rotatably connected to a rotating shaft (23), the peripheral side surface of the rotating shaft (23) is fixedly mounted with a rotary arm (24), the bottom surfaces of the rotary arm (24) and the positioning arm (19) are respectively fixedly connected to two indexing rings (31), the rotating shaft (23) is driven by the shaft sleeve (22), and the bottom surfaces of the positioning arm (19) and the rotary arm (24) are both clamped with a group of tightening members that cooperate with the corrugated protective tube (4).

6. The air duct bolt tightening device for a narrow space in a subway station according to claim 5, characterized in that: The transmission shaft (21) and the outer spiral tube (20) are both fixedly mounted with a transmission button (25) on their circumferential side surfaces, the positioning arm (19) is fixedly mounted with a paddle (26) on its circumferential side surface, the end of the shaft sleeve (22) is fixedly mounted with a transmission bevel gear, and the circumferential side surface of the rotating shaft (23) is fixedly mounted with a driven bevel gear in transmission connection with the transmission bevel gear.

7. The air duct bolt tightening device for a narrow space in a subway station according to claim 6, characterized in that: A transmission part is fixedly provided on the peripheral side surface of the transmission shaft (21), and a transmission slide groove with a tail end opening and slidably connected to the transmission part is fixedly provided inside the shaft sleeve (22), and the cross sections of the transmission part and the transmission slide groove are both regular polygons.

8. The air duct bolt tightening device for a narrow space in a subway station according to claim 7, characterized in that: The tightening member comprises two symmetrically arranged clamping heads (27), a metal strap (28) is connected between the opposite surfaces of the two clamping heads (27), a group of positioning clamping columns (29) are fixedly installed on the top surfaces of the two clamping heads (27), and the bottom surfaces of the rotary arm (24) and the positioning arm (19) are provided with a plurality of regularly distributed positioning slots that are clamped with the positioning clamping columns (29).

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