CN210735997U

CN210735997U - Novel rescue tripod

Info

Publication number: CN210735997U
Application number: CN201921651251.0U
Authority: CN
Inventors: 赵晨; 赵连君; 王佳竹
Original assignee: Beijing Honglintai Electrical Engineering Co Ltd
Current assignee: Beijing Honglintai Electrical Engineering Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-12
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a novel rescue tripod, which is erected on the periphery of a well head and comprises a top disc and three supporting parts which are distributed in a triangular shape, wherein the supporting parts are hinged with the top disc, a manual winch is arranged on the supporting parts, a fixed pulley is suspended on the top disc, a hanging rope is wound on the manual winch, one end of the hanging rope is fixedly connected with the manual winch, and the other end of the hanging rope is in a free hanging state and is fixedly connected with a hook by winding the fixed pulley; three the supporting component includes and deviates from the one end of top plate one end from the bracing piece with top plate articulated main tributary vaulting pole and articulate at the main tributary vaulting pole, and the articulated shaft is located the main tributary vaulting pole and follows same one side of bracing piece, and three articulated shaft all sets up towards the well head. The utility model has the advantages that the space that reduces the support component occupies, the staff of being convenient for transports the tripod.

Description

Novel rescue tripod

Technical Field

The utility model relates to a rescue instrument technical field, concretely relates to novel rescue tripod.

Background

In a sewer well in the municipal construction field, a cable well in the communication engineering construction field and a rescue and rescue place, large rescue equipment cannot reach the rescue area, and in the construction operation and operation, maintenance and repair processes, construction equipment and materials often need to be hung into the well from the ground, sometimes, obstacles in the construction or rescue place need to be lifted away and removed, and personnel are conveyed to enter and exit the well to complete construction or rescue.

The utility model discloses a current utility model patent that bulletin number is CN205170243U discloses an emergency rescue tripod, including top hinge spare and the support component who has flexible function, it is three the support component is followed the circumferencial direction of top hinge spare, the equipartition is in on the hinge spare of top, still including fixed the setting the fixed pulley on the hinge spare of top still includes the cooperation the string rope of fixed pulley is provided with manual hoist engine on one of them support component, the one end of hanging the rope is fixed on manual hoist engine, the other end with be the free state of hanging behind the fixed pulley cooperation, through hanging the rope and carry out the well head with the heavy object or put into the well head.

Because the supporting part has certain length, the occupied space is more in the transportation process, and the transportation of workers is inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel rescue tripod, its advantage is that the space that reduces the support component occupies, and the staff of being convenient for transports the tripod.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a novel rescue tripod is erected on the periphery of a well head and comprises a top disc and three supporting parts which are distributed in a triangular shape, wherein the supporting parts are hinged with the top disc, a manual winch is arranged on the supporting parts, a fixed pulley is hung on the top disc, a hanging rope is wound on the manual winch, one end of the hanging rope is fixedly connected with the manual winch, and the other end of the hanging rope is in a free hanging state and fixedly connected with a hook by winding the fixed pulley; three the supporting component includes and deviates from the one end of top plate one end from the bracing piece with top plate articulated main tributary vaulting pole and hinge at the main tributary vaulting pole, and the articulated shaft is located the bracing piece and follows same one side of bracing piece, and three articulated shaft all sets up towards the well head.

Through the technical scheme, when a worker folds the tripod, the auxiliary supporting rod can be folded towards the main supporting rod along the hinged shaft, so that the auxiliary supporting rod and the main supporting rod are close to each other, the length of the supporting part is reduced, and the space occupation of the tripod in the transportation process is reduced conveniently; and three articulated shaft all sets up towards the well head, and the downward effort of tripod is applyed to the heavy object that the couple was hooked to the incline direction that deviates from the well head along the supporting part distributes, and when normal use, can not rotate round the articulated shaft from the bracing piece, thereby guarantees the stability of tripod.

The utility model discloses further set up to: be provided with the cover on the main tributary vaulting pole and establish the protective sheath outside the articulated shaft, the protective sheath is the opening towards the U type of articulated shaft, the protective sheath include with the main tributary vaulting pole with follow the bracing piece can dismantle a pair of inserted bar of being connected and with a pair of inserted bar fixed connection's connecting rod, the joint groove of pegging graft with the inserted bar cooperation is seted up with one side of following the bracing piece towards the inserted bar to the main tributary vaulting pole.

Through above-mentioned technical scheme, a pair of inserted bar of protective sheath is pegged graft at the main tributary vaulting pole and from the bracing piece to restrict the tripod in the use from bracing piece and main tributary vaulting pole round the articulated shaft, improve the stability and the security of tripod.

The utility model discloses further set up to: the holding tank has been seted up to inserted bar one side, and the rigid coupling has first spring in the holding tank, and one side rigid coupling that first spring deviates from the holding tank has the joint piece that slides with the holding tank cooperation, and the joint piece is the hemisphere towards one side of draw-in groove.

Through above-mentioned technical scheme, the inserted bar inserts the in-process in joint groove, first spring is extruded, the joint piece is extruded into the holding tank in, guarantee that the inserted bar can get into the joint inslot smoothly, when the cell wall in joint piece and joint groove breaks away from, initial position is resumeed to first spring, make the joint piece with the main tributary vaulting pole or follow the inner wall butt of bracing piece, reduce the possibility that the inserted bar drops from the joint inslot, thereby reduce the main tributary vaulting pole and follow the bracing piece round articulated shaft pivoted possibility, improve the stability and the security of tripod.

The utility model discloses further set up to: the connecting rod is provided with a second magnet, and the main support rod is provided with a first magnet which is magnetically attracted with the second magnet.

Through above-mentioned technical scheme, during folding tripod, the staff dismantles the protective sheath to through the mutual magnetism between first magnet and the second magnet, fix the protective sheath on the main tributary vaulting pole, reduce the protective sheath and lose the possibility when not using.

The utility model discloses further set up to: the slave supporting rod comprises a hinge part hinged with the main supporting rod and a sliding part which deviates from one end of the main supporting rod with the hinge part and is in a round rod shape, and an extension rod connected with the sliding part in a sliding mode is sleeved outside the sliding part.

Through above-mentioned technical scheme, the staff can be according to the size of a dimension of well head, through the distance of adjusting the portion of sliding and sliding into the extension rod, adjusts the length of tripod for the tripod is suitable for not unidimensional well head.

The utility model discloses further set up to: the extension rod is round bar shape, is provided with a plurality of fixed slot and is used for connecting the intercommunication groove between two adjacent fixed slots along its not co-altitude department on the extension rod inner wall, is provided with the slider of being connected with fixed slot and intercommunication groove slide on the portion outer wall that slides.

Through above-mentioned technical scheme, slide through slider and fixed slot and intercommunication groove, improve the gliding stability of portion of sliding and extension rod, when the slider slides in the fixed slot of co-altitude department, the adjustable distance that the portion of sliding slided into the extension rod, simple structure, the staff's operation of being convenient for.

The utility model discloses further set up to: the extension rod is provided with a fixing component used for fixing the extension rod on the main support rod.

Through above-mentioned technical scheme, fixed subassembly's setting can be fixed extension rod and from the bracing piece on the main tributary vaulting pole round the articulated shaft, avoids jolting in the transportation and leads to the possibility of following bracing piece and extension rod random motion.

The utility model discloses further set up to: fixed subassembly slides the pole and the rigid coupling that slides of being connected including passing the extension rod and with the extension rod and is the butt post of rectangle on the pole orientation bracing piece one end that slides, and the main tributary vaulting pole is and offers the trompil that supplies the butt post to pass the main tributary vaulting pole lateral wall on cavity and the main tributary vaulting pole, and the trompil is the rectangle the same with the butt post, rotates the butt post butt behind the pole that slides on the inner wall of main tributary vaulting pole.

Through above-mentioned technical scheme, after supporting component is folding, the staff is through moving the pole that slides towards the main tributary vaulting pole direction for the pole that slides passes the trompil, and rotates 90 degrees, makes butt post butt on the inner wall of main tributary vaulting pole, thereby fixes extension rod and follow the bracing piece on the main tributary vaulting pole.

The utility model discloses further set up to: the vertical rigid coupling of the one end that the pole that slides deviates from the butt joint post has the restriction to slide the spacing ring that the pole slided out the extension rod, is located the cover on the pole that slides between extension rod outer wall and the spacing ring and is equipped with the second spring, and second spring both ends and spacing ring and extension rod leave the space.

Through the technical scheme, when a worker pushes the limiting ring to drive the sliding rod to move towards the main support rod, the limiting ring extrudes the second spring, so that the second spring moves towards the direction of the extension rod and is compressed and is abutted against the outer wall of the extension rod; the worker enables the abutting column to abut against the inner wall of the main support rod by penetrating the sliding rod through the opening and rotating the sliding rod for 90 degrees; when loosening the spacing ring, the second spring has the trend of recovering initial condition to drive the pole of sliding and move towards the spacing ring direction, drive the butt post and hug closely on the main tributary vaulting pole inner wall, thereby strengthen the connection between extension rod and the main tributary vaulting pole.

To sum up, the utility model discloses following beneficial effect has:

1. the length of the supporting part is reduced by folding the auxiliary supporting rod around the hinge shaft to the main supporting rod, and the space occupation of the supporting part during transportation is reduced;

2. the stability and the safety of the tripod are improved by arranging the protective sleeve for limiting the rotation of the main supporting rod and the auxiliary supporting rod;

3. through setting up fixed subassembly, be convenient for fix the folding from bracing piece, extension rod on the main tributary bracing piece.

Drawings

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

FIG. 2 is a schematic view of the structure of the highlighted support member;

FIG. 3 is an enlarged schematic view of section A of FIG. 2;

FIG. 4 highlights a structural schematic view of the first connecting groove;

FIG. 5 is a view showing the support rods folded from the support rods;

FIG. 6 is a schematic view showing the structure of the fixing member.

In the figure, 1, top plate; 2. a support member; 21. a main support bar; 211. a first magnet; 212. a clamping groove; 22. a slave support bar; 221. a hinge portion; 222. a sliding part; 223. a slider; 23. hinging a shaft; 24. an extension pole; 241. a horizontal column; 242. a communicating groove; 243. fixing grooves; 25. a stabilizing cord; 3. a protective sleeve; 31. inserting a rod; 311. accommodating grooves; 312. a first spring; 313. a clamping block; 32. a connecting rod; 321. a second magnet; 4. a manual hoist; 41. a fixed pulley; 42. hanging a rope; 43. hooking; 5. a fixing assembly; 51. a slide bar; 52. a butting post; 521. opening a hole; 53. a limiting ring; 54. a second spring.

Detailed Description

Example (b): the utility model provides a novel rescue tripod, as shown in figure 1, sets up in the well head periphery, including top dish 1 and three supporting component 2 that are triangular distribution, three supporting component 2 is the circumferencial direction along top dish 1 and lays, and all articulates with top dish 1, and top dish 1 is located the well head, and the bottom of three supporting component 2 is located the periphery of well head. The fixed pulley 41 is detachably hung below the top disc 1, the manual winch 4 is installed on one of the supporting parts 2 through a bolt, the hanging rope 42 is wound on the manual winch 4, one end of the hanging rope 42 is connected with the manual winch 4, and the other end of the hanging rope penetrates through the fixed pulley 41 and is fixedly connected with the hook 43 and is in a free hanging state. The manual hoist 4 has a clutch self-locking function, and even if the worker loosens the manual hoist 4, the hook 43 cannot pull the hanging rope 42 to fall downwards. When the tripod is used, a worker hooks the hook 43 on a heavy object, and lifts the heavy object out of the wellhead or puts the heavy object into the wellhead by retracting the hanging rope 42 through the manual winch 4.

As shown in fig. 1 and 2, in order to reduce the space occupied by the support member 2 during transportation, the support member 2 is configured to be foldable, the support member 2 includes a main support rod 21 hinged to the top plate 1 and a secondary support rod 22 hinged to an end of the main support rod 21 away from the top plate 1, and hinge shafts 23 are located on the same side of the main support rod 21 and the secondary support rod 22, and three hinge shafts 23 are all arranged toward the wellhead. With reference to fig. 6, the secondary support rod 22 is folded along the hinge shaft 23 toward the primary support rod 21, so that the secondary support rod 22 is adjacent to the primary support rod 21, the length of the support member 2 is reduced, the occupied space during transportation is reduced, and the tripod is convenient for a worker to transport.

As shown in fig. 1 and 2, since the hinge shaft 23 is provided at a side facing the wellhead and the inclination direction of the acting force supporting member 2 applied to the tripod by the weight is downward, the slave supporting rod 22 is not folded up along the hinge shaft 23 toward the master supporting rod 21 in the normal use state, and the tripod can normally support and stand. However, when the tripod works, if a worker collides with the slave supporting rod 22 in the direction of the wellhead, the worker easily moves the slave supporting rod 22 in the direction of the wellhead, so that the stress balance of the tripod is damaged, and the possibility of falling of the tripod is increased. Referring to fig. 3, a protective sleeve 3 sleeved outside the hinge shaft 23 is disposed on the main support rod 21, the protective sleeve 3 is U-shaped with an opening facing the hinge shaft 23, the protective sleeve 3 includes a pair of insertion rods 31 detachably connected with the main support rod 21 and the support rod 22, and a connection rod 32 fixedly connected with the pair of insertion rods 31, and the main support rod 21 and one side facing the insertion rods 31 from the support rod 22 are provided with clamping grooves 212 matched and plugged with the insertion rods 31.

As shown in fig. 2 and fig. 3, the main supporting rod 21 and the auxiliary supporting rod 22 are both hollow, the accommodating groove 311 is formed in one side of the inserting rod 31, the first spring 312 is fixedly connected in the accommodating groove 311, the clamping block 313 matched with the accommodating groove 311 to slide is fixedly connected to one side of the first spring 312 away from the accommodating groove 311, and one side of the clamping block 313 facing the clamping groove is hemispherical. By inserting the pair of insertion rods 31 into the clamping grooves 212, the groove walls of the clamping grooves 212 press the clamping blocks 313, so that the first springs 312 are compressed, the clamping blocks 313 return to the accommodating grooves 311, so that the insertion rods 31 can be smoothly inserted into the clamping grooves 212, when the clamping blocks 313 are separated from the clamping grooves 212, the first springs 312 restore to the initial state, a part of the clamping blocks 313 slide out of the accommodating grooves 311 and abut against the inner walls of the main support rod 21 and the auxiliary support rod 22, and the protective sleeve 3 falls off from the main support rod 21 and the auxiliary support rod 22. The setting of protective sheath 3 avoids the tripod in the use, takes place pivoted possibility from bracing piece 22, has improved the stability and the security of tripod.

As shown in fig. 2 and 3, when folding the tripod, the worker first detaches the manual winding machine 4 and the fixed pulley 41, and then shifts the protective sleeve 3 in the direction away from the main supporting rod 21, so that the clamping block 313 compresses the first spring 312 under the extrusion of the groove wall of the clamping groove 212, the clamping block 313 returns to the accommodating groove 311, and the inserting rod 31 is pulled out from the supporting component 2. Referring to fig. 5, the secondary support bar 22 is then folded over toward the primary support bar 21 along the hinge shaft 23 so that the secondary support bar 22 is adjacent to the primary support bar 21, reducing the length of the support member 2 and reducing the space occupied during tripod transportation.

As shown in fig. 2 and 3, in order to avoid the loss of the protective cover 3, the second magnet 321 is disposed on the connecting rod 32, the first magnet 211 magnetically attracting the second magnet 321 is disposed on one side wall of the main supporting rod 21, and the protective cover 3 is fixed on the main supporting rod 21 by the magnetic attraction between the first magnet 321 and the second magnet 211, so as to reduce the possibility of the loss of the protective cover 3.

As shown in fig. 1 and 4, in order to facilitate the worker to adjust the inclination angle of the support member 2 according to the size of the wellhead, the slave support rod 22 includes a hinge portion 221 hinged to the master support rod 21 and a sliding portion 222 fixedly connected to one end of the hinge portion 221 away from the master support rod 21 and having a circular rod shape, the sliding portion 222 is sleeved with an extension rod 24 slidably connected to the sliding portion 222, the extension rod 24 has a circular rod shape, the outer wall of the sliding portion 222 is provided with a sliding block 223, the inner wall of the extension rod 24 is provided with a plurality of fixing grooves 243 along different heights thereof and a communication groove 242 for connecting two adjacent fixing grooves 243, in this embodiment, three fixing grooves 243 are provided, the number of the communication grooves 242 is three, the communication grooves 242 and the fixing grooves 243 are vertically communicated, the worker can adjust the sliding distance of the sliding portion 222 sliding into the extension rod 24 by sliding the sliding block 223 into the fixing grooves, thereby adjusting the length of the support member 2.

When the staff is adjusting the length of supporting component 2, can lift a supporting component 2 and leave ground certain distance, draw extension rod 24 towards ground direction, perhaps draw main tributary vaulting pole 21 towards deviating from extension rod 24 direction, make slider 223 slide in extension rod 24, through sliding slider 223 to the fixed slot 243 that corresponds the height on, thereby adjust the distance that sliding part 222 slided into extension rod 24, be convenient for the staff is according to the size of well head, adjust the length of supporting component 2, adjust the inclination of supporting component 2.

As shown in fig. 1 and 5, when the tripod is folded, the worker detaches the manual hoist 4, the fixed block 41 and the stabilizing rope 25 from the support part 2 and turns the extension pole 24 along the hinge shaft 23 so that the extension pole 24 is folded with the main support pole 21, the extension pole 24 is provided with a fixing assembly 5 for fixing the folded extension pole 24 to the main support pole 21, and the extension pole 24 is hollow. Referring to fig. 6, the fixing assembly 5 includes a sliding rod 51 passing through the extension rod 24 and slidably connected to the extension rod 24, and a rectangular abutting column 52 fixedly connected to one end of the sliding rod 51 facing the main support rod 21, an opening 521 is formed in the main support rod 21 for the abutting column 52 to pass through a side wall of the main support rod 21, the opening 521 is rectangular as the abutting column 52, and the abutting column 52 after rotating the sliding rod 51 abuts against an inner wall of the main support rod 21, so as to fix the extension rod 24 to the main support rod 21.

As shown in fig. 5 and 6, in order to enhance the connection between the abutting column 52 and the inner wall of the main support rod 21, a stop ring 53 for limiting the sliding rod 51 from sliding out of the extension rod 24 is vertically and fixedly connected to one end of the sliding rod 51 away from the abutting column 52, a second spring 54 is sleeved on the sliding rod 51 between the outer wall of the extension rod 24 and the stop ring 53, and gaps are left between two ends of the second spring 54 and the stop ring 53 and the extension rod 24. When the worker pushes the limiting ring 53 to drive the sliding rod 51 to move towards the main support rod 21, the limiting ring 53 presses the second spring 54, so that the second spring 54 moves towards the extension rod 24 and is compressed, and is abutted against the outer wall of the extension rod 24; the worker makes the abutment post 52 abut on the inner wall of the main support pole 21 by passing the slide pole 51 through the open hole 521 and rotating 90 degrees; when the stop collar 53 is released, the second spring 54 tends to return to its original state, thereby moving the sliding rod 51 toward the stop collar 53 and bringing the abutment post 52 into abutment against the inner wall of the main support rod 21, thereby strengthening the connection between the extension rod 24 and the main support rod 21.

As shown in fig. 1, in order to enhance the stability of the tripod, a horizontal column 241 horizontally placed on the ground is hinged to one end of the extension rod 24 away from the main support rod 21, the end surface area of the horizontal column 241 is larger than that of the extension rod 24, and the arrangement of the horizontal column 241 increases the support area between the extension rod 24 and the ground, thereby enhancing the support function of the tripod. One side that three extension rod 24 deviates from the bracing piece is hung and is equipped with and stabilizes rope 25, and the length of stabilizing rope 25 is greater than the length that three extension rod 24 encloses into triangle-shaped, and stabilizes rope 25 setting and is being close to ground department, does not influence staff business turn over well head, stabilizes the distance that rope 25 restriction extension rod 24 moved outward to the well head to improve the stability and the security of tripod.

The working process is as follows: when folding the tripod, the staff dismantles manual hoist 4, fixed pulley 41 and protective sheath 3 earlier, and the pole 51 that slides again slides on the third fixed slot 243, will turn over from bracing piece 22 along articulated shaft 23 to the position department that is close to with main tributary vaulting pole 21 at last to fix extension rod 24 on main tributary vaulting pole 21 through fixed subassembly 5, thereby reduce the length of supporting part 2, be convenient for reduce the space in the tripod motion process and occupy.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a novel rescue tripod, set up on the well head periphery, including top dish (1) and three supporting component (2) that are triangular distribution, supporting component (2) are articulated with top dish (1), be provided with manual hoist engine (4) on supporting component (2), top dish (1) has hung fixed pulley (41), it has hanging rope (42) to coil on manual hoist engine (4), it has rope (42) to hang rope (42) one end and manual hoist engine (4) rigid coupling, the other end is walked around fixed pulley (41) and is freely hanging state and rigid coupling and have couple (43), characterized by: three supporting component (2) include with top dish (1) articulated main tributary vaulting pole (21) and articulate and deviate from one of top dish (1) one end from bracing piece (22) main tributary vaulting pole (21), and articulated shaft (23) are located main tributary vaulting pole (21) and follow same one side of bracing piece (22), and three articulated shaft (23) all set up towards the well head.

2. The novel rescue tripod as claimed in claim 1, wherein: be provided with on main tributary vaulting pole (21) and establish protective sheath (3) outside articulated shaft (23), protective sheath (3) are the opening towards the U type of articulated shaft (23), protective sheath (3) including with main tributary vaulting pole (21) and from bracing piece (22) can dismantle a pair of inserted bar (31) of being connected and with a pair of inserted bar (31) fixed connection's connecting rod (32), main tributary vaulting pole (21) and from bracing piece (22) towards one side of inserted bar (31) offer with the joint groove (212) of inserted bar (31) cooperation grafting.

3. A novel rescue tripod as claimed in claim 2, wherein: holding tank (311) have been seted up to inserted bar (31) one side, and the rigid coupling has first spring (312) in holding tank (311), and one side rigid coupling that first spring (312) deviate from holding tank (311) has joint piece (313) that slides with holding tank (311) cooperation, and joint piece (313) are the hemisphere towards one side of draw-in groove.

4. A novel rescue tripod as claimed in claim 3, wherein: the connecting rod (32) is provided with a second magnet (321), and the main supporting rod (21) is provided with a first magnet (211) which is magnetically attracted with the second magnet (321).

5. The novel rescue tripod as claimed in claim 1, wherein: the auxiliary supporting rod (22) comprises a hinge part (221) hinged with the main supporting rod (21) and a sliding part (222) which is fixedly connected with one end of the hinge part (221) away from the main supporting rod (21) and is in a round rod shape, and an extension rod (24) connected with the sliding part (222) in a sliding mode is sleeved outside the sliding part (222).

6. The novel rescue tripod as claimed in claim 5, wherein: the extension rod (24) is in a round rod shape, a plurality of fixing grooves (243) and a communication groove (242) used for connecting two adjacent fixing grooves (243) are formed in the inner wall of the extension rod (24) along different heights of the extension rod, and a sliding block (223) connected with the fixing grooves (243) and the communication groove (242) in a sliding mode is arranged on the outer wall of the sliding portion (222).

7. The novel rescue tripod as claimed in claim 6, wherein: the extension rod (24) is provided with a fixing component (5) for fixing the extension rod (24) on the main support rod (21).

8. The novel rescue tripod as claimed in claim 7, wherein: fixed subassembly (5) including pass extension rod (24) and with extension rod (24) slide rod (51) of being connected and rigid coupling be butt post (52) of rectangle on slide rod (51) face main tributary vaulting pole (21) one end, main tributary vaulting pole (21) pole is offered on cavity and main tributary vaulting pole (21) and supplies butt post (52) to pass trompil (521) of main tributary vaulting pole (21) lateral wall, trompil (521) are the same rectangle with butt post (52), butt post (52) butt behind rotation slide rod (51) is on the inner wall of main tributary vaulting pole (21).

9. The novel rescue tripod as claimed in claim 8, wherein: the vertical rigid coupling of the one end that slides pole (51) deviates from butt joint post (52) has spacing ring (53) that restriction slide pole (51) slided out extension rod (24), is located slide pole (51) between extension rod (24) outer wall and spacing ring (53) and goes up the cover and be equipped with second spring (54), and second spring (54) both ends and spacing ring (53) and extension rod (24) leave the space.