CN114682983A

CN114682983A - Pipe connection auxiliary device for water conservancy construction

Info

Publication number: CN114682983A
Application number: CN202210407815.6A
Authority: CN
Inventors: 曾冉; 孟炜; 崔满强
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-07-01

Abstract

The utility model relates to a pipeline connection auxiliary device for water conservancy construction, which mainly relates to the technical field of pipeline connection auxiliary devices and comprises a guide rail arranged on the ground at the pipeline splicing position along the pipeline laying direction, a base connected to the guide rail in a sliding way, a clamping mechanism arranged on the base, a driving mechanism arranged on the clamping mechanism and a supporting mechanism arranged on the base; the driving mechanism comprises a driving motor arranged on the clamping mechanism, a transmission rod rotationally connected to the clamping mechanism along the horizontal direction, and gear rods rotationally connected to two sides of the clamping mechanism along the vertical direction; the power output shaft of the driving motor is in chain transmission connection with the transmission rod, two ends of the transmission rod are respectively meshed with the two gear rods, and the two gear rods are respectively meshed with two sides of the guide rail. The method and the device have the advantages of improving the precision and efficiency of pipeline connection work, saving time and labor.

Description

Pipe connection auxiliary device for water conservancy construction

Technical Field

The application relates to the technical field of pipeline connection auxiliary devices, in particular to a pipeline connection auxiliary device for water conservancy construction.

Background

The drainage pipeline is used as an important component of the hydraulic facility, and the construction efficiency and the construction quality of the drainage pipeline can influence the integral completion degree of the hydraulic engineering. Therefore, a set of high-quality and high-efficiency installation scheme of the water conservancy construction drainage pipeline has higher economic prospect and research value.

The installation difficulty of the drainage pipeline for water conservancy construction mainly lies in the splicing of the pipeline. For ease of transport, the drainage duct is usually cut into short pipes for easy movement. Before the drainage pipeline is put into use, the multiple short pipes need to be spliced into a continuous pipeline again. At present, the common splicing mode is to use hoisting equipment to hoist the pipeline and weld the spliced part. The position of hoisting equipment needs to be changed continuously when the scheme is used for connecting a plurality of sections of long-distance pipelines in large-scale hydraulic engineering, and the disassembly and assembly operation needs to be carried out manually and repeatedly, so that the efficiency of the pipeline connecting operation is adversely affected. Due to the limitation of the operation precision of the hoisting equipment, the coaxiality of the butt joint of the pipelines is difficult to guarantee.

To the correlation technique among the above-mentioned, the inventor finds that there is the defect that efficiency is lower and the butt joint precision can't be guaranteed in current pipeline butt joint operation scheme for water conservancy construction.

Disclosure of Invention

In order to improve the efficiency and the precision of pipe connection work for the water conservancy construction, this application provides a pipe connection auxiliary device for the water conservancy construction.

The application provides a pair of pipe connection auxiliary device for water conservancy construction adopts following technical scheme:

a pipeline connection auxiliary device for water conservancy construction comprises a guide rail arranged on the ground at a pipeline splicing position along a pipeline laying direction, a base connected to the guide rail in a sliding manner, a clamping mechanism arranged on the base, a driving mechanism arranged on the clamping mechanism and a supporting mechanism arranged on the base; the driving mechanism comprises a driving motor arranged on the clamping mechanism, a transmission rod rotationally connected to the clamping mechanism along the horizontal direction, and gear rods rotationally connected to two sides of the clamping mechanism along the vertical direction; the power output shaft of the driving motor is in chain transmission connection with the transmission rod, two ends of the transmission rod are respectively meshed with the two gear rods, and the two gear rods are respectively meshed with two sides of the guide rail.

By adopting the technical scheme, the guide rail fixedly arranged on the ground at the pipeline splicing position along the pipeline laying direction plays a role in supporting and limiting the base on the guide rail, the base provides an installation position for the clamping mechanism and the supporting mechanism of the pipeline splicing position and plays a role in supporting the clamping mechanism, the clamping mechanism can be matched with the supporting mechanism to clamp and fix the pipeline to be processed, the pipeline clamped and fixed by the clamping mechanism and the supporting mechanism can slide along the guide rail under the supporting action of the base, so that the pipeline can be aligned with another pipeline under the limiting action of the guide rail, the coaxiality and the welding quality of pipeline connection are ensured, the driving motor in the driving mechanism serves as a power source, and a transmission rod in chain transmission connection with a power output shaft of the driving motor can transmit torque generated by the rotation of the driving motor to gear rods at two sides in a bevel gear meshing mode, the bottom can take place to rotate with the gear pole of guide rail meshing under the effect of transfer line to promote the base and take place to slide along the guide rail direction, actuating mechanism can provide power for the slip of base on the guide rail, reduces the manpower consumption, improves pipeline butt joint work's efficiency of construction.

Optionally, the edges of two sides of the upper surface of the base, which are parallel to the guide rail, are symmetrically provided with raised lines, the bottom of the clamping mechanism is provided with a groove, and the raised lines are clamped with the groove of the clamping mechanism.

Through adopting above-mentioned technical scheme, along being on a parallel with the guide rail direction symmetry establish the sand grip of base upper surface both sides edge can insert the recess that fixture bottom was seted up to form the joint structure of easily assembling and dismantling, this structure can make things convenient for the staff to install fixture on the base or demolish fixture from the base, thereby can improve the efficiency to the repeated tight operation of clamp of pipeline.

Alternatively, the cross-sectional width of the ribs may be gradually reduced in a direction facing vertically upward.

Through adopting above-mentioned technical scheme, the structural design that the cross section width of sand grip reduces gradually along the ascending direction of vertical ground makes the top thickness of sand grip less to make the sand grip insert more easily and set up in the recess of clamping mechanism bottom, be favorable to avoiding appearing the sand grip because of being difficult for aligning the recess, be difficult to insert and cause the influence to clamping mechanism's assembly efficiency, further promoted pipeline butt joint work's efficiency of construction.

Optionally, the base is equipped with the slope with the perpendicular both sides edge of guide rail, be equipped with a plurality of round rollers along length direction on the slope, round roller rotates with the slope to be connected.

Through adopting above-mentioned technical scheme, the slope with the installation of guide rail vertically both sides edge has played the guide effect to the pipeline on the base, make the user can with promote or pull etc. more laborsaving mode with the piping erection base, a plurality ofly along the installation of slope length direction and slope rotate the round roller of being connected and can change the slip friction between pipeline and the slope into the less friction of frictional force, the resistance that the pipeline suffered when having reduced the piping erection base, thereby the assembly process of pipeline has been simplified, the efficiency of construction of pipeline butt joint work has further been promoted.

Optionally, the clamping mechanism includes side plates symmetrically arranged on two side edges of the upper surface of the base along the vertical direction, a top plate horizontally arranged on the top of the side plates, and clamping claws arranged on the side plates in a penetrating manner.

Through adopting above-mentioned technical scheme, the curb plate has played and has fixed fixture on the base effect, provides mounted position and limiting displacement for the clamping jaw simultaneously, installs the roof at the curb plate top and has played and connect two curb plates effect as an organic whole, wears to establish the clamping jaw on the curb plate and can carry out the centre gripping fixedly to the left and right sides of treating the pipeline of processing.

Optionally, the clamping jaw comprises two screw rods penetrating through the side plate and an elastic sheet rotatably connected to one end of each screw rod close to the base; the two screws are connected through chain transmission.

Through adopting the above technical scheme, the screw rod of wearing to establish on the curb plate has played the supporting role to the shell fragment of connecting the screw rod and being close to base one end, thereby the shell fragment can hug closely the outer wall of pipeline under the effect of screw rod and realize the centre gripping fixed function to the pipeline, the shell fragment rotates the structural design who is connected with the screw rod and can avoid the screw rod to rotate the centre gripping state that causes the influence to the shell fragment, two screw rods make the turned angle and the slew velocity homoenergetic of two screw rods keep unanimous through chain drive connection's structural design, the user only need rotate one of them screw rod and can let two screw rod synchronous feed, avoid the pin joint of screw rod and shell fragment to appear damaging because of the asynchronous motion of two screw rods, the convenience of use has been improved, the efficiency of construction of pipeline butt joint work has further been promoted.

Optionally, a sleeve is arranged on the side plate in a penetrating manner; the sleeve is sleeved on the screw and is in threaded fit with the screw.

Through adopting above-mentioned technical scheme, the sleeve structure of wearing to establish on the curb plate can increase curb plate and screw rod threaded connection's cooperation length, improves curb plate and screw rod connection structure's mechanical stability, makes it can bear bigger load and nonelastic deformation does not appear, has improved the application scope of this application.

Optionally, a plurality of rib plates are arranged at the connecting part of the side plate and the top plate.

Through adopting above-mentioned technical scheme, curb plate and roof junction fixed mounting's a plurality of gussets can show the resistance to compression and the tensile ability that improves curb plate and roof connection structure, have improved curb plate and roof connection structure's mechanical stability, make by fixed the generation processing pipeline of fixture be difficult to appear rocking earlier and the condition of slippage after the centre gripping is fixed, improved the use convenience of this application.

Optionally, the elastic sheet is arc-shaped, and a rubber gasket is arranged on the concave surface of the elastic sheet.

Through adopting the above technical scheme, the convex structural design of shell fragment makes its outer wall that can laminate the pipeline of treating processing better, can effectively increase the area of contact of shell fragment and pipeline outer wall, thereby improve fixture's frictional force to the pipeline, the concave surface of shell fragment can increase frictional force with the rubber gasket of the contact surface installation of pipeline outer wall promptly on the one hand, it is more stable to make fixture treat the centre gripping of processing pipeline, on the other hand can avoid the direct heat preservation of fish tail pipeline surface of shell fragment, positive effect has been played to improving the piping erection quality.

Optionally, the supporting mechanism includes a plurality of supporting cylinders vertically arranged on the base, a supporting rod arranged on the supporting cylinders in a penetrating manner, and a supporting plate arranged at one end of the supporting rod far away from the supporting cylinders; the supporting cylinder is rotatably connected with the base, and the supporting rod is in threaded fit with the supporting cylinder.

Through adopting above-mentioned technical scheme, the pipeline that the processing was treated to the backup pad plays the fixed effect of support, and the bracing piece makes the user can jack-up the bracing piece through the mode of rotatory a support section of thick bamboo with a support section of thick bamboo screw-thread fit and a support section of thick bamboo and base rotation connection's structural design to realize the function of adjustment backup pad height in vertical side.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the guide rail fixedly arranged on the ground at the pipeline splicing position along the pipeline laying direction plays a role in supporting and limiting the base on the guide rail, the base provides a mounting position for the clamping mechanism and the supporting mechanism of the device and plays a role in supporting the clamping mechanism, the clamping mechanism can be matched with the supporting mechanism to clamp and fix a pipeline to be processed, the pipeline clamped and fixed by the clamping mechanism and the supporting mechanism can slide along the guide rail under the supporting action of the base, so that the pipeline can be aligned with another pipeline under the limiting action of the guide rail, the coaxiality and the welding quality of pipeline connection are ensured, a driving motor in the driving mechanism serves as a power source, a transmission rod in chain transmission connection with a power output shaft of the driving motor can transmit torque generated by the rotation of the driving motor to gear rods at two sides in a bevel gear meshing mode, the gear rod with the bottom meshed with the guide rail can rotate under the action of the transmission rod and push the base to slide along the direction of the guide rail, and the driving mechanism can provide power for the sliding of the base on the guide rail, so that the labor consumption is reduced, and the construction efficiency of pipeline butt joint work is improved;

2. the screw rods penetrating through the side plates have a supporting effect on the elastic pieces connected to one ends, close to the base, of the screw rods, the elastic pieces can be tightly attached to the outer wall of the pipeline under the effect of the screw rods, so that the pipeline is clamped and fixed, the structural design that the elastic pieces are rotationally connected with the screw rods can avoid the influence of the rotation of the screw rods on the clamping state of the elastic pieces, the rotation angles and the rotation speeds of the two screw rods can be kept consistent through the structural design that the two screw rods are connected through chain transmission, a user can synchronously feed the two screw rods only by rotating one of the screw rods, the damage of the hinge joints of the screw rods and the elastic pieces due to asynchronous movement of the two screw rods is avoided, the use convenience is improved, and the construction efficiency of pipeline butt joint work is further improved;

3. the convex structural design of shell fragment in this application makes its outer wall that can laminate the pipeline of treating processing better, can effectively increase the area of contact of shell fragment and pipeline outer wall, thereby improve fixture's frictional force to the pipeline, the concave surface of shell fragment can increase frictional force with the rubber gasket of the contact surface installation of pipeline outer wall promptly on the one hand, it is more stable to make fixture treat the centre gripping of processing the pipeline, on the other hand can avoid the direct heat preservation of fish tail pipeline surface of shell fragment, positive effect has been played to improving the piping erection quality.

Drawings

Fig. 1 is a schematic structural diagram of a pipeline connection auxiliary device for water conservancy construction disclosed in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a guide rail and a base in the embodiment of the present application.

Fig. 3 is a schematic structural diagram of a clamping mechanism in an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a support mechanism in an embodiment of the present application.

Description of reference numerals: 1. a guide rail; 2. a base; 21. a convex strip; 22. a slope; 23. a round roller; 3. a clamping mechanism; 31. a side plate; 32. a top plate; 33. a clamping jaw; 34. a rib plate; 311. a sleeve; 331. a screw; 332. a spring plate; 333. a rubber gasket; 4. a drive mechanism; 41. a drive motor; 42. a transmission rod; 43. a gear lever; 5. a support mechanism; 51. a support cylinder; 52. a support bar; 53. a support plate; .

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Pipeline laying is an important link of hydraulic engineering construction. At present, pipeline butt joint operation related to pipeline laying mainly adopts a scheme that hoisting equipment is used for hoisting a pipeline, and then manual alignment and fixed connection are carried out. The operation scheme has the defects of insufficient efficiency and poor accuracy when the operation scheme is used for the butt joint work of the long-distance multi-section pipelines. In order to improve the efficiency and the assembly precision of pipe connection construction, this application embodiment has provided a pipe connection auxiliary device for water conservancy construction.

The embodiment of the application discloses pipe connection auxiliary device for water conservancy construction. Referring to fig. 1, the auxiliary pipe connection device for water conservancy construction includes a guide rail 1, a base 2, a clamping mechanism 3, a driving mechanism 4, and a supporting mechanism 5. Wherein, the guide rail 1 is fixedly arranged on the ground below the pipeline splicing position along the pipeline laying direction. Base 2 installs on guide rail 1 through sliding connection's mode, and base 2 can take place to slide along pipe laying's direction, and fixture 3 can dismantle the connection on base 2 through the mode of joint to can slide along with base 2 together. The driving mechanism 4 is installed on the top of the clamping mechanism 3, and the driving mechanism 4 can provide power for the base 2 to slide along the guide rail 1. The supporting mechanism 5 is installed on the base 2, and can support the pipeline to be processed fixed by the clamping mechanism 3 and finely adjust the position of the pipeline in the vertical direction.

Referring to fig. 1 and 2, the guide rail 1 may be a linear guide made of a long metal plate provided with grooves. The length direction of the guide rail 1 is the same as the direction of laying the pipeline. The guide rail 1 may be fixedly installed on the ground by means of a plurality of anchor bolts. The length of the guide rail 1 can be selected according to the actual production requirements. The multi-section guide rail 1 can be lengthened through welding and other modes so as to meet different use scenes. Racks are arranged on the left side wall and the right side wall of the groove on the upper surface of the guide rail 1 in a bolt connection or welding mode.

Referring to fig. 1 and 2, the base 2 may be a metal plate abutting against a groove on the upper surface of the guide rail 1, and the base 2 is slidably connected to the guide rail 1. The convex strip 21 is installed on two side edges of the upper surface of the base 2 parallel to the guide rail 1 in an integrated molding mode through welding or casting, the cross section of the convex strip 21 is trapezoidal, and the width of the cross section of the convex strip 21 is gradually reduced along the upward direction vertically facing. The slope 22 is installed on the two side edges of the upper surface of the base 2 perpendicular to the guide rail 1 in a welding mode, and the slope 22 can be a section of metal strip with a right-angled triangle cross section. The ramp 22 is provided with a plurality of round rollers 23, and in the present embodiment, two round rollers 23 may be provided on each ramp 22. The round roller 23 is rotatably connected to the ramp 22. The round roller 23 may be an elastic roller made of rubber.

Referring to fig. 1 and 3, the chucking mechanism 3 includes a side plate 31, a top plate 32, a clamping claw 33, and a rib plate 34. The side plate 31 may be a rectangular metal plate with a groove on the lower surface, the side plate 31 is installed perpendicular to the base 2, and the protruding strip 21 on the base 2 is inserted into the groove on the lower surface of the side plate 31 to form an abutment. The number of rib plates 34 is set to 2. The top plate 32 is mounted on the upper surfaces of the two side plates 31 in a direction parallel to the base 2 by welding or bolting. A rib plate 34 is installed at the joint of the top plate 32 and the side plate 31 by welding. The webs 34 may be metal sheets having a right triangle cross-section. Two right-angle sides of the rib plate 34 are respectively and vertically connected with the lower surface of the top plate 32 and the side surface of the side plate 31.

Referring to fig. 1 and 3, a clamping jaw 33 is mounted on each side plate 31. The clamping jaw 33 includes a threaded rod 331, a spring plate 332 and a rubber washer 333. Wherein the number of the screw 331 may be 2. The screw 331 is disposed through the side plate 31 and is threadedly engaged with the side plate 31. The screw 331 is provided with a spring 332 at one end thereof near the base 2 by a rotary connection. The elastic piece 332 may be a long metal piece with a circular arc shape. The concave surface of the elastic sheet 332, that is, the contact surface with the outer wall of the pipeline, is provided with a rubber gasket 333 by means of liquid glue bonding. The two screw rods 331 of each clamping jaw 33 are connected in a chain transmission manner, and the chain wheels sleeved on the two screw rods 331 are equal in size. Each screw 331 is sleeved with a sleeve 311, the sleeves 311 are in threaded fit with the screws 331, and the sleeves 311 are vertically connected with the side surfaces of the side plates 31 in a welding mode.

Referring to fig. 1, the driving mechanism 4 includes a driving motor 41, a transmission lever 42, and a gear lever 43. The driving motor 41 is fixed to the upper surface of the top plate 32 by bolting. The driving lever 42 is installed on the upper surface of the top plate 32 in a horizontal direction, and the driving lever 42 is rotatably coupled with the top plate 32. The power output shaft of the driving motor 41 is connected with the transmission rod 42 in a chain transmission mode, and torque is transmitted. The number of the gear levers 43 may be set to 2. The gear rods 43 are inserted through both side edges of the top plate 32 in a direction perpendicular to the ground. Bevel gears are mounted at two ends of the transmission rod 42, and two ends of the transmission rod 42 are respectively connected with the top ends of the two gear rods 43 in a bevel gear meshing mode. The bottom ends of the two gear rods 43 are respectively meshed with the racks on the two sides of the guide rail 1.

Referring to fig. 1 and 4, the support mechanism 5 includes a support cylinder 51, a support rod 52, and a support plate 53. Wherein, the support cylinder 51 can be a cylindrical cylinder body with a thread section arranged inside, the bottom end of the support cylinder 51 is embedded on the upper surface of the base 2, and the support cylinder 51 is rotatably connected with the base 2. The support rod 52 is arranged in the support cylinder 51 in a penetrating way, and the support rod 52 is matched with the support cylinder 51 in a threaded way. The user can lift up the support rod 52 by rotating the support cylinder 51. The top of the support bar 52 is connected to the support plate 53 by welding. The number of the support cylinders 51 and the support rods 52 may be set to 2. The supporting plate 53 may be a rectangular metal plate with a cylindrical concave surface.

The utility model provides a water conservancy is pipe connection auxiliary device for construction's implementation principle does: the constructor firstly installs guide rail 1 at the assigned position, then imbeds base 2 in the recess of guide rail 1, inspects its slip condition and does not have unusual back, installs fixture 3 on base 2, then supplies power for driving motor 41 and inspects whether each part transmission structure of actuating mechanism 4 operates normally, can begin pipeline butt joint installation work after the inspection is errorless.

The constructor firstly arranges a plurality of pipelines to be butt-jointed on the track in sequence, then starts the driving motor 41 to make the base 2 slide towards the direction of the pipelines and finally slide into the clamping mechanism 3. The pipeline is clamped and fixed by adjusting the clamping mechanism 3, the height of the pipeline in the vertical direction is finely adjusted by adjusting the supporting mechanism 5 until the coaxiality of the butt joint of the pipeline meets the installation standard, and finally the driving motor 41 is started to rotate reversely, so that the pipeline to be processed can be aligned with the clamped pipeline. Constructors can connect the pipelines afterwards. After the connection is completed, the clamping mechanism 3 is adjusted to enable the pipeline to fall off from the clamping mechanism 3, and then the processes are repeated to carry out butt joint installation on other pipelines.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A pipeline connection auxiliary device for water conservancy construction is characterized by comprising a guide rail (1) arranged on the ground of a pipeline splicing position along a pipeline laying direction, a base (2) connected to the guide rail (1) in a sliding manner, a clamping mechanism (3) arranged on the base (2), a driving mechanism (4) arranged on the clamping mechanism (3) and a supporting mechanism (5) arranged on the base (2); the driving mechanism (4) comprises a driving motor (41) arranged on the clamping mechanism (3), a transmission rod (42) connected to the clamping mechanism (3) in a rotating mode along the horizontal direction, and gear rods (43) connected to two sides of the clamping mechanism (3) in a rotating mode along the vertical direction; the power output shaft of the driving motor (41) is in chain transmission connection with a transmission rod (42), two ends of the transmission rod (42) are respectively meshed with two gear rods (43), and the two gear rods (43) are respectively meshed with two sides of the guide rail (1).

2. The pipe connection auxiliary device for water conservancy construction according to claim 1, characterized in that: the clamping mechanism is characterized in that convex strips (21) are symmetrically arranged on two side edges, parallel to the guide rail (1), of the upper surface of the base (2), grooves are formed in the bottom of the clamping mechanism (3), and the convex strips (21) are connected with the grooves of the clamping mechanism (3) in a clamping mode.

3. The pipe connection auxiliary device for water conservancy construction according to claim 2, characterized in that: the cross-sectional width of the rib (21) is gradually reduced in a direction facing vertically upward.

4. The pipe connection auxiliary device for water conservancy construction according to claim 1, characterized in that: base (2) and guide rail (1) vertically both sides edge are equipped with slope (22), be equipped with a plurality of round rollers (23) along length direction on slope (22), round roller (23) are connected with slope (22) rotation.

5. The pipe connection auxiliary device for water conservancy construction according to claim 1, characterized in that: the clamping mechanism (3) comprises side plates (31) symmetrically arranged on two side edges of the upper surface of the base (2) along the vertical direction, a top plate (32) horizontally arranged at the top of each side plate (31) and clamping claws (33) arranged on the side plates (31) in a penetrating mode.

6. The pipe connection auxiliary device for water conservancy construction according to claim 5, characterized in that: the clamping claw (33) comprises two screw rods (331) penetrating through the side plate (31) and an elastic sheet (332) rotatably connected to one end, close to the base (2), of each screw rod (331); the two screw rods (331) are connected through chain transmission.

7. The pipe connection auxiliary device for water conservancy construction according to claim 5, characterized in that: a sleeve (311) is arranged on the side plate (31) in a penetrating way; the sleeve (311) is sleeved on the screw rod (331) and is in threaded fit with the screw rod (331).

8. The pipe connection auxiliary device for water conservancy construction according to claim 5, characterized in that: and a plurality of rib plates (34) are arranged at the connecting part of the side plate (31) and the top plate (32).

9. The pipe connection auxiliary device for water conservancy construction according to claim 6, characterized in that: the elastic sheet (332) is arc-shaped, and a rubber gasket (333) is arranged on the concave surface of the elastic sheet (332).

10. The pipe connection auxiliary device for water conservancy construction according to claim 1, characterized in that: the supporting mechanism (5) comprises a plurality of supporting cylinders (51) vertically arranged on the base (2), a supporting rod (52) arranged on the supporting cylinders (51) in a penetrating mode and a supporting plate (53) arranged at one end, far away from the supporting cylinders (51), of the supporting rod (52); the supporting cylinder (51) is rotatably connected with the base (2), and the supporting rod (52) is in threaded fit with the supporting cylinder (51).