CN116180639B - Automatic lifting device for highway height limiting rod - Google Patents

Abstract

The invention discloses an automatic lifting device for a highway height limit pole, which comprises two groups of load-bearing rods, sliding grooves are provided on the sides of the load-bearing rods, a truss is arranged at the top of the load-bearing rods, and a fixed Seat, the top of the fixed seat is provided with a limit slot, and the bottom end of the truss is also provided with a connecting slot, and the sliding slot is provided with a lifting rod whose end is located in the load-bearing rod, and the load-bearing rod is fixedly connected near the top. The limited gear ring, this automatic lifting device for the height limit rod of the highway, involves the technical field of the height limit rod, which solves the problem that the original truss has an upper limit height, the lifting space is limited, and the upper space cannot be fully opened, and the applicability for special equipment with a high height is poor. When an emergency occurs, such as when the fire truck needs to pass the height limit pole for rescue work, it cannot pass through normally, and needs to change the route or dismantle it on site, which will lead to the delay of rescue work.

Description

An automatic lifting device for a highway height limit pole

technical field

The invention relates to the technical field of height-limiting poles, in particular to an automatic lifting device for height-limiting poles on highways.

Background technique

The height limit pole is also called the height limit frame, which can be roughly divided into two types, the fixed height limit frame and the adjustable height limit frame; the fixed one-piece height limit frame is mainly used for the portal frame at the entrance of bridges, culverts, and tunnels, and is generally welded by steel structures. It plays the role of protecting bridges, culverts, and tunnels. In an emergency, to achieve vehicle passage, it must be lifted by external force; there is a sign board with a limited height in meters, which is used to remind vehicles. The adjustable height limit is divided into manual height limit. 1. Two types of electric height limiters; manual height limiters can manually lift the height limiter through the manual device when needed;

The Chinese patent application number CN202222189898.4 discloses a height-adjustable height-limiting pole for roads, including a limited-height pole assembly, and a height-limiting pole assembly, including two support columns for placing on both sides of the road, two The top of the support column is fixed with a top plate, the top plate is connected to two support columns to make the installation more stable, and there is a movable plate slidingly connected between the two support columns, through which the effect of height limit is achieved. Between the movable panels, the height of the height-limiting rod assembly can be adjusted during use by adjusting the components, so as to facilitate the adjustment of the height-limiting range according to the actual situation, but the lifting space of the height-limiting rod is limited, and the upper space cannot be fully opened. When an emergency occurs, such as when the fire truck needs to carry out rescue work through the height limit pole, after adjusting the height limit pole to the highest height, if it still cannot pass normally, it needs to change the route or remove it on site, which will lead to rescue work. Delay, for this reason, we propose an automatic lifting device for a highway height limit pole.

Contents of the invention

The object of the present invention is to provide an automatic raising and lowering device for a highway height limit pole, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: an automatic lifting device for a highway height limit pole, comprising: two sets of load-bearing rods, sliding grooves are opened on the sides of the load-bearing rods, and a truss is arranged at the top of the load-bearing rods, The bottom end of the load-bearing rod is provided with a fixing seat, the top of the fixed seat is provided with a limiting groove, the bottom end of the truss is also provided with a connecting groove, and the sliding groove is provided with a lifting rod whose end is located in the load-bearing rod. The load-bearing rod is fixedly connected to the limit gear ring near the top end, and the limit gear ring is set as an opening at the sliding groove, and the top end of the load-bearing rod is provided with a matching ring that matches the limit gear ring. The gear ring, the matching gear ring is fixedly connected with the bottom end of the truss, the load-bearing rod is provided with a rotation notch located at the top of the sliding groove, and the rotation notch is provided with a device that slides with the inner wall of the load-bearing rod. The connected arc block, the inner wall of the load-bearing rod is also fixedly connected with a blocking block, the blocking block is provided with an arc shaft fixedly connected to it at one end, and the other end of the arc shaft is slidingly connected with the arc block , the arc-shaped shaft is also sleeved with a spring located between the arc-shaped plate and the blocking block, and the top of the load-bearing rod is provided with a connecting mechanism connected with the truss, which solves the problem that the original truss has an upper limit. The height and the lifting space are limited, and the upper space cannot be fully opened. The applicability of special equipment with a high height is poor. When an emergency occurs, such as when a fire truck needs to carry out rescue work through the height limit pole, it cannot pass normally and needs to change its route. Or on-site dismantling, which will lead to the delay of rescue work;

Preferably, the load-bearing rod is fixedly connected with a mounting block, and the mounting block is rotatably connected with a threaded rod arranged inside the load-bearing rod, and the threaded rod is threadedly connected with the lifting rod, and the lifting rod is A connecting shaft adapted to the connecting groove is fixedly connected, a power mechanism is also provided on the load-bearing rod, and a moving shaft is rotatably connected to the bottom end of the bearing rod, and a rectangular groove is opened on the moving shaft. The moving shaft is located in the limiting groove, and the bottom end of the moving shaft is fixedly connected with a first gear, and the first gear is meshed with a rack fixedly connected with the inside of the fixed seat, and the bottom end of the load-bearing rod There is a docking mechanism adapted to the moving shaft.

Preferably, the power mechanism includes a mounting plate arranged on the outside of the load-bearing rod and fixedly connected to it, the motor is fixedly connected to the mounting plate, and the bottom end of the mounting plate is also fixedly connected to the limiting groove The matching limit shaft, the output end of the motor is fixedly connected with a power shaft, and the power shaft is connected to the threaded rod through transmission, which is beneficial to provide power for the whole.

Preferably, the docking mechanism includes a coil arranged near the bottom end of the threaded rod and fixedly connected thereto, the bottom end of the coil is fixedly connected with a first magnet block, and the bottom end of the threaded rod is slidably connected with a sliding sleeve, A second magnet block is fixedly connected to the top of the sliding sleeve, and the magnetic properties of the second magnet block and the first magnet block are the same, and a sleeve is fixedly connected between the first magnet block and the second magnet block. The first tension spring on the threaded rod is fixedly connected to the bottom end of the sliding sleeve with an insertion shaft matching the rectangular slot, which is beneficial to control whether to drive the moving shaft to rotate.

Preferably, the connection mechanism includes a rotating disc arranged inside the load-bearing rod close to the top end and connected to it in rotation. The rotating disc is provided with multiple sets of telescopic shafts with one end fixedly connected to it. The other end of the telescopic shaft It is fixedly connected with the truss, and a second extension spring is sheathed on the telescopic shaft, so that the connection between the truss and the load-bearing rod is more stable.

Preferably, any one set of the trusses is fixedly connected with a first plugging block, two groups of the trusses are connected through the first plugging blocks, and any one set of the lifting rods is far away from the end of the load-bearing rod The second plug-in block is fixedly connected, and the two sets of lifting rods are plugged in through the second plug-in block, so that the truss remains stable at the daily limit and height, and at the same time cooperates in the return position.

Preferably, the power shaft is fixedly connected with a driving wheel, the driving wheel is connected with a belt, and the belt is connected with a driven wheel fixedly connected with the threaded rod, which is beneficial to the power shaft and the threaded rod. Stable transmission.

Preferably, the end of the plug-in shaft close to the rectangular slot is tapered, which facilitates the stable insertion of the plug-in shaft into the rectangular slot.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention effectively solves the problem that the original truss has an upper limit height, the lifting space is limited, the upper space cannot be fully opened, and the applicability of special equipment with a high height is poor. When an emergency occurs, such as a fire truck needs to pass through the height limit pole When carrying out rescue work, it is impossible to pass normally, and it is necessary to change the route or dismantle it on site, which will lead to the problem of delay in rescue work. When the daily passing height is sufficient, the operation of the motor drives the two sets of threaded rods to rotate through transmission, and Drive the two sets of moving rods to slide up and down in the sliding grooves accordingly, so as to control the height limit of the height limit rods to meet the daily height adjustment. The docking mechanism operates, wherein the second magnet block is magnetically identical to the first magnet block, the second magnet block moves, and finally drives the insertion shaft at the bottom end of the sliding sleeve to insert into the rectangular groove on the moving shaft, because the bottom of the insertion shaft The setting of the end taper enables the insertion shaft to be stably inserted into the rectangular groove, which facilitates the subsequent movement of the load-bearing rod on the fixed seat, so that the position of the truss can be driven by the load-bearing rod to move;

2. In the present invention, the two groups of load-bearing rods drive the two groups of trusses and the two groups of lifting rods to be disconnected from each other. The lifting rods slide upward in the sliding groove through the threaded rods at the same time, and the connecting shafts on the lifting rods are gradually inserted into the trusses. In the connecting groove at the bottom, and in the process of continuing to rise, the truss is lifted, and the matching gear ring at the bottom of the truss moves upwards on the top of the load-bearing rod, and the matching gear ring gradually disengages from the limit gear ring, and the truss rises At the same time, it drives the telescopic shaft to stretch, and the lifting rod continues to rise until it moves to the top of the sliding groove and contacts the arc block. At this time, the threaded rod drives the lifting rod to rotate when it rotates, and the lifting rod drives the truss to rotate at the same time. The truss and the two sets of lifting rods rotate in mirror image at the same time, and the movement state is like opening a door. At this time, there is no restriction on the space above the high rods, and various vehicles can pass freely, which is beneficial to deal with situations of various heights.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a schematic diagram of the bottom structure of the truss of the present invention;

Figure 3 is an enlarged view of area A in Figure 2;

Fig. 4 is a schematic diagram of the overall internal structure of the load-bearing rod of the present invention;

Figure 5 is an enlarged view of area B in Figure 4;

Figure 6 is an enlarged view of area C in Figure 4;

Fig. 7 is a schematic diagram of the internal structure of the bottom end of the load-bearing rod and the fixing seat of the present invention;

Fig. 8 is a schematic diagram of the overall fixed internal structure of the present invention;

Fig. 9 is a structural schematic diagram of the docking mechanism of the present invention;

Fig. 10 is a schematic diagram of the top structure of the load-bearing rod of the present invention;

Fig. 11 is a schematic diagram of the structure of the rotating notch in the present invention.

In the figure: 1-load-bearing rod; 2-sliding groove; 3-truss; 4-the first plug block; 12-rack; 14-installation block; 15-threaded rod; 16-connecting shaft; 17-power mechanism; 18-installation plate; 19-motor; 20-limit shaft; 21-power shaft; - driving wheel; 23 - belt; 24 - driven wheel; 25 - moving shaft; 26 - rectangular slot; 27 - first gear; 28 - docking mechanism; 29 - coil; 30 - first magnet block; 31 - sliding sleeve; 32-the second magnet block; 33-the first extension spring; 34-insert shaft; 35-limiting gear ring; 36-cooperating gear ring; 37-rotation notch; 38-arc block; 40-arc shaft; 41-spring; 42-connection mechanism; 43-turning disc; 44-telescopic shaft; 45-the second extension spring.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1-Fig. 11, the present invention provides a technical solution: an automatic lifting device for a highway height limit pole, comprising: two sets of load-bearing rods 1, the sides of the load-bearing rods 1 are provided with sliding grooves 2, and the A truss 3 is provided at the top of the load-bearing bar 1, and two sets of trusses 3 are mirrored at the top of the two sets of load-bearing bars 1. The bottom end of the load-bearing bar 1 is provided with a fixing seat 6, and the fixing seat 6 is installed on both sides of the road for the overall Stable, the top of the fixed base 6 is provided with a limiting groove 7, and the bottom end of the truss 3 is also provided with a connecting groove 5, and the sliding groove 2 is provided with a lifting rod 9 whose end is located in the load-bearing rod 1, two groups The elevating rod 9 is set as a mirror image, and the load-bearing rod 1 is fixedly connected with a limit gear ring 35 near the top, and the limit gear ring 35 is located at the sliding groove 2 and is set as an opening, and the top end of the load-bearing rod 1 is sleeved with a A matching gear ring 36 adapted to the limiting gear ring 35, the matching gear ring 36 is fixedly connected to the bottom end of the truss 3, and the load-bearing rod 1 is provided with a rotating shaft located at the top end of the sliding groove 2. The notch 37, the rotation notch 37 is provided with an arc-shaped block 38 slidingly connected to the inner wall of the load-bearing rod 1, and the inner wall of the load-bearing rod 1 is also fixedly connected with a blocking block 39, and the blocking block 39 is provided with One end is fixedly connected with the arc shaft 40, the other end of the arc shaft 40 is slidingly connected with the arc block 38, and the arc shaft 40 is also sleeved with the arc plate and the blocking block. The spring 41 between the blocks 39, the top of the load-bearing rod 1 is provided with a connection mechanism 42 connected to the truss 3, and the connection mechanism 42 includes a spring that is arranged inside the load-bearing rod 1 near the top and is rotatably connected to it. Rotating disk 43, said rotating disk 43 is provided with a plurality of telescopic shafts 44 with one end fixedly connected with it, the other end of said telescopic shaft 44 is fixedly connected with said truss 3, said telescopic shaft 44 is also sleeved with a second Two extension springs 45;

The load-bearing rod 1 is fixedly connected with a mounting block 14, and the mounting block 14 is rotatably connected with a threaded rod 15 arranged inside the load-bearing rod 1, and the threaded rod 15 is threadedly connected with the lifting rod 9, so that The lifting rod 9 is fixedly connected with a connecting shaft 16 that is compatible with the connecting groove 5, and the load-bearing rod 1 is also provided with a power mechanism 17, and the bottom end of the load-bearing rod 1 is rotatably connected with a moving shaft 25, so A rectangular groove 26 is provided on the moving shaft 25, the moving shaft 25 is located in the limiting groove 7, and the bottom end of the moving shaft 25 is fixedly connected with a first gear 27, and the first gear 27 is meshed with a The rack 12 fixedly connected with the inside of the fixed seat 6, the bottom end of the load-bearing bar 1 is provided with a docking mechanism 28 suitable for the moving shaft 25, and the power mechanism 17 includes a 1 outside and fixedly connected to the mounting plate 18, the motor 19 is fixedly connected to the mounting plate 18, and the bottom end of the mounting plate 18 is also fixedly connected to the limit shaft 20 that is compatible with the limit groove 7 , the output end of the motor 19 is fixedly connected with a power shaft 21, the power shaft 21 and the threaded rod 15 are connected in transmission, the power shaft 21 is fixedly connected with a driving wheel 22, and the driving wheel 22 drives A belt 23 is connected, and the belt 23 is drivingly connected with a driven wheel 24 fixedly connected with the threaded rod 15, which is beneficial to the stable transmission between the power shaft and the threaded rod.

The docking mechanism 28 includes a coil 29 which is arranged near the bottom end of the threaded rod 15 and is fixedly connected thereto. Sliding sleeve 31, the top of the sliding sleeve 31 is fixedly connected with a second magnet block 32, the magnetic properties of the second magnet block 32 and the first magnet block 30 are the same, the first magnet block 30 and the second magnet block 30 A first extension spring 33 sleeved on the threaded rod 15 is fixedly connected between the magnet blocks 32, and an insertion shaft 34 matching the rectangular slot 26 is fixedly connected to the bottom end of the sliding sleeve 31, so that The distance between the two groups of load-bearing rods can be expanded when the restriction is released, and at the same time, the truss and the lifting rod are driven to release the plug-in connection, wherein, in order to facilitate the insertion of the plug-in shaft 34 into the rectangular slot 26, the plug-in shaft 34 is close to the rectangular slot One end of 26 is set to taper.

Any set of trusses 3 is fixedly connected with a first plug-in block 4, two groups of trusses 3 are inserted through the first plug-in block 4, and any set of lifting rods 9 is far away from the load-bearing rod One end of 1 is fixedly connected with a second plug-in block 10 , and the two groups of lifting rods 9 are plugged in through the second plug-in block 10 .

When it is necessary to control the height limit of the height limit bar, the motors 19 on the two sets of mounting plates 18 are controlled to operate simultaneously, and the output end of the motor 19 drives the power shaft 21 to rotate, and the power shaft 21 then drives the driving wheel 22 to rotate, and Through the transmission connection of the belt 23, the driven wheel 24 is further driven to rotate, and the driven wheel 24 then drives the threaded rod 15 fixedly connected with it to rotate on the mounting block 14. The lifting rod 9 is connected by the second plug-in block 10, and when the two groups of threaded rods 15 are rotating, the two groups of moving rods are driven to slide up and down in the sliding groove 2, so as to control the height limit of the height-limiting rod. And when the height limit of the height limit bar needs to be fully removed, the coil 29 is energized, and now the first magnet block 30 fixedly connected with the coil 29 has magnetism, and the second magnet block 32 is the same as the magnetism of the first magnet block 30 At this time, the first magnet block 30 pushes the second magnet block 32 downward, and the first tension spring 33 is stretched in cooperation at this time, while the sliding sleeve 31 and the bottom end of the threaded rod 15 slide axially, and the second The magnet block 32 then drives the sliding sleeve 31 fixedly connected with it to slide downward at the bottom end of the threaded rod 15 until the insertion shaft 34 at the bottom end of the sliding sleeve 31 is inserted into the rectangular groove 26 on the moving shaft 25. The setting of the end taper makes the insertion shaft 34 stably inserted into the rectangular groove 26;

When the plug shaft 34 is inserted into the rectangle, the rotating threaded rod 15 passes through the sliding sleeve 31 and the plug shaft 34, and then drives the moving shaft 25 to rotate, and the moving shaft 25 drives the first gear 27 fixedly connected to the bottom end to rotate. Rotate, through the meshing connection between the first gear 27 and the rack 12, the first gear 27 moves to the other side in the fixed seat 6, and the moving shaft 25 moves correspondingly in the limit groove 7, and by moving The shaft 25 is connected to the rotation of the bottom end of the load-bearing rod 1, and then drives the load-bearing rod 1 to move simultaneously, the two sets of load-bearing rods 1 move in the opposite direction at the same time, and the two groups of trusses 3 move simultaneously until the first plug-in block 4 and the other One group of trusses 3 is disconnected, and the two groups of lifting rods 9 below the trusses 3 move at the same time, and the second plug block 10 is also disconnected from the other group of lifting rods 9. The positioning shaft 20 moves correspondingly in the limiting groove 7;

When the two groups of trusses 3 and the two groups of lifting rods 9 are disconnected from each other, the lifting rods 9 slide upward in the sliding groove 2 through the threaded rods 15 at the same time, and the connecting shaft 16 on the lifting rods 9 is gradually inserted into the bottom of the truss 3 In the connection groove 5 at the end, and in the process of continuing to rise, the truss 3 is lifted, and the matching gear ring 36 at the bottom end of the truss 3 moves upward on the top of the load-bearing rod 1, and the matching gear ring 36 gradually aligns with the limit gear ring 35 is disengaged, the truss 3 rises and simultaneously drives the telescopic shaft 44 to stretch, and the second extension spring 45 cooperates to stretch at the same time, and the lifting rod 9 continues to rise until it moves to the top of the sliding groove 2 and contacts the arc block 38. Now when the threaded rod 15 is rotating, it drives the elevating rod 9 to rotate with the threaded rod 15 as the center of circle, and the elevating rod 9 drives the truss 3 to rotate simultaneously, and two groups of trusses 3 and two groups of elevating rods 9 rotate simultaneously, and the state is to open the door shape, and when the lifting rod 9 rotates in the rotation notch 37, the arc block 38 is squeezed, and at this time, the spring 41 is squeezed, and the arc shaft 40 slides toward the inside of the arc block 38. The high pole as a whole has no restrictions on the road, and can freely pass through various vehicles. After passing through, the motor 19 is controlled to rotate in the opposite direction, and the overall parts of the height limiting pole are returned, while the spring 41 rebounds to push the arc block 38 Move toward the rotation notch 37 again, and after the overall return, the coil 29 is de-energized, and this time, the high limit bar can perform simple height limit adjustment again.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. An automatic lifting device for a highway height limit pole, characterized in that it includes: two sets of load-bearing rods (1), the sides of the load-bearing rods (1) are provided with sliding grooves (2), and the load-bearing rods (1) ) is provided with a truss (3) at the top, and the bottom end of the load-bearing rod (1) is provided with a fixing seat (6), and the top of the fixing seat (6) is provided with a limiting groove (7), and the bottom end of the truss (3) There is also a connection slot (5), the sliding slot (2) is provided with a lifting rod (9) whose end is located in the load-bearing rod (1), and the load-bearing rod (1) is fixedly connected to a limited position near the top end. Gear ring (35), the limit gear ring (35) is located at the slide groove (2) and is set as an opening, and the top end of the load-bearing rod (1) is sleeved with the limit gear ring (35). An adapted matching gear ring (36), the matching gear ring (36) is fixedly connected to the bottom end of the truss (3), and the load-bearing rod (1) is provided with a Rotation notch (37), the arc-shaped block (38) slidingly connected with the inner wall of the load-bearing rod (1) is provided at the rotation notch (37), and the inner wall of the load-bearing rod (1) is also fixedly connected with a blocking block (39), the blocking block (39) is provided with an arc-shaped shaft (40) fixedly connected to it at one end, and the other end of the arc-shaped shaft (40) is slidingly connected with the arc-shaped block (38), The arc shaft (40) is also sleeved with a spring (41) between the arc plate and the blocking block (39), and the top end of the load-bearing rod (1) is provided with the truss ( 3) connected connecting mechanism (42); The load-bearing rod (1) is fixedly connected with a mounting block (14), and the mounting block (14) is rotatably connected with a threaded rod (15) arranged inside the load-bearing rod (1), and the threaded rod (15) ) is threadedly connected with the lifting rod (9), and the connecting shaft (16) matching the connecting groove (5) is fixedly connected to the lifting rod (9), and the load-bearing rod (1) is A power mechanism (17) is also provided, and the bottom end of the bearing rod (1) is rotatably connected with a moving shaft (25), and a rectangular groove (26) is opened on the moving shaft (25), and the moving shaft (25) It is located in the limit groove (7), and the bottom end of the moving shaft (25) is fixedly connected with a first gear (27), and the first gear (27) is meshed with the fixed seat (6) The rack (12) is fixedly connected inside, and the bottom end of the load-bearing rod (1) is provided with a docking mechanism (28) that is compatible with the moving shaft (25); Any one set of trusses (3) is fixedly connected with a first plug-in block (4), and the two groups of trusses (3) are plugged through the first plug-in block (4), and any one set of The end of the lifting rod (9) away from the load-bearing rod (1) is fixedly connected with a second plug-in block (10), and two groups of the lifting rods (9) are connected through the second plug-in block (10). plugging; The docking mechanism (28) includes a coil (29) arranged near the bottom end of the threaded rod (15) and fixedly connected thereto, the bottom end of the coil (29) is fixedly connected with a first magnet block (30), The bottom end of the threaded rod (15) is slidably connected with a sliding sleeve (31), and the top end of the sliding sleeve (31) is fixedly connected with a second magnet block (32), and the second magnet block (32) is connected with the first The magnetism of a magnet block (30) is the same, and the first tension spring sleeved on the threaded rod (15) is fixedly connected between the first magnet block (30) and the second magnet block (32) (33), the bottom end of the sliding sleeve (31) is fixedly connected with an insertion shaft (34) matching the rectangular slot (26). 2. An automatic lifting device for a highway height limit pole according to claim 1, characterized in that: the power mechanism (17) includes a mounting plate (18) arranged on the outside of the load-bearing pole (1) and fixedly connected to it ), the motor (19) is fixedly connected to the mounting plate (18), and the bottom end of the mounting plate (18) is also fixedly connected with a limit shaft (20 ), the output end of the electric motor (19) is fixedly connected with a power shaft (21), and the power shaft (21) is connected in transmission with the threaded rod (15). 3. An automatic lifting device for a highway height limit pole according to claim 1, characterized in that: the connection mechanism (42) includes a rotating shaft arranged inside the load-bearing rod (1) close to the top end and connected to it in rotation disc (43), the rotating disc (43) is provided with multiple sets of telescopic shafts (44) with one end fixedly connected with it, the other end of the telescopic shaft (44) is fixedly connected with the truss (3), the The telescopic shaft (44) is also sheathed with a second extension spring (45). 4. An automatic lifting device for a highway height limit pole according to claim 2, characterized in that: the drive shaft (21) is fixedly connected with a drive wheel (22), and the drive wheel (22) is connected with a drive A belt (23), the belt (23) is drive-connected with a driven wheel (24) fixedly connected to the threaded rod (15). 5. The automatic lifting device for a highway height limit pole according to claim 1, characterized in that: the end of the plug-in shaft (34) close to the rectangular groove (26) is set in a tapered shape.

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