CN216737160U - Hoisting device applied to three-pipe pile suction type jacket - Google Patents

Abstract

The application discloses a lifting device applied to a three-pipe-pile suction type jacket, which comprises an upper lifting device, a lower lifting device and a pin shaft device used for being connected with lifting lugs of the three-pipe-pile suction type jacket, wherein the upper lifting device comprises a frame beam, four hanging lugs are formed on the periphery of the frame beam, first hanging strips connected with a floating crane lifting hook are arranged at the four hanging lugs in a winding mode, and four hanging wheels are arranged in the middle of the frame beam; the lower lifting appliance comprises a cross beam, wherein three second lifting belts are arranged on the cross beam in a winding mode, four first lifting belt shafts are arranged at positions, corresponding to four hanging wheels, of the cross beam, connection lifting belts are connected between the hanging wheels and the corresponding first lifting belt shafts, the pin shaft devices are three and correspond to three lifting lugs of the three-pipe-pile suction type guide pipe frame in a one-to-one mode, the pin shaft devices are detachably connected with the corresponding lifting lugs, and the second lifting belts are connected with the three pin shaft devices in a one-to-one mode. This application helps reducing the restriction of three tubular pile suction jacket.

Description

Hoisting device applied to three-pipe pile suction type jacket

Technical Field

The application relates to the field of ocean engineering installation, in particular to a hoisting device applied to a three-pipe-pile suction type jacket.

Background

With the rapid development of wind power generation technology, wind power plants which can be developed and utilized on land are less and less, and offshore wind power development is more and more emphasized. The three-pipe pile suction type jacket is produced by operation, the total height of the jacket is generally more than 80 meters, and the total weight is about 2000 tons. The three-pipe pile suction type jacket has the characteristics of no need of piling, no need of a large positioner and low construction noise, the soil penetration depth is more conventional, and the three-pipe pile suction type jacket has good adaptability in a region with a shallower rock stratum in a site, so that the three-pipe pile suction type jacket is increasingly applied to the foundation of offshore wind power.

Referring to fig. 1 and 2, there is a three tubular pile suction type jacket at present, including jacket main part 1, three suction section of thick bamboo 2 is installed to the lower part of jacket main part 1, the upper portion integrated into one piece of jacket main part 1 has box girder changeover portion 3, the plane of box girder changeover portion 3 is equilateral triangle shape, and 3 three angle departments of box girder changeover portion all install lug 4, lug 4 includes two otic placodes 41, two otic placodes 41 are vertical and the interval is installed in the apex angle department of box girder changeover portion 3, wear-to-establish hole 411 has been seted up on two otic placodes 41, supply the suspender to hang required round pin axle and pass. In practice, the lower lifting points of the three lifting straps are fixed with the three lifting lugs respectively, and then the lifting hooks of the floating cranes are used for hooking the upper lifting points of the three lifting straps, so that the three-pipe-pile suction type jacket can be lifted and transferred.

However, the distances between the lifting hooks of different floating cranes are different, but the distances between the three lifting points of the three-pipe-pile suction type jacket are fixed, and if the distances between the lifting hooks are too large or too small, then the three-pipe-pile suction type jacket is lifted, the three-pipe-pile suction type jacket is not stable, so in practice, the adaptive floating crane is needed, but the offshore working environment is severe, the adaptive floating crane is difficult to match, namely the existing lifting environment has limitation, and therefore the invention needs to provide a lifting appliance, so that different floating cranes can be adapted to the three-pipe-pile suction type jacket.

SUMMERY OF THE UTILITY MODEL

In order to reduce the restriction of three tubular pile suction type jacket hoists, this application provides a hoist and mount that is applied to three tubular pile suction type jacket.

The application provides a hoist and mount that is applied to three tubular pile suction jacket adopts following technical scheme:

the hoisting device comprises an upper hoisting device, a lower hoisting device and a pin shaft device, wherein the pin shaft device is used for being connected with a three-pipe-pile suction type jacket lifting lug; the lower lifting appliance comprises a cross beam, wherein three second lifting belts are arranged on the cross beam in a winding mode, four first lifting belt shafts are arranged at positions, corresponding to four hanging wheels, of the cross beam, connection lifting belts are connected between the hanging wheels and the corresponding first lifting belt shafts, the pin shaft device is three and is in one-to-one correspondence with three lifting lugs of a three-pipe-pile suction type guide pipe frame, the pin shaft device is detachably connected with the corresponding lifting lugs, and the second lifting belts are connected with the three pin shaft device in one-to-one correspondence.

By adopting the technical scheme, in the process of hoisting the three-pipe-pile suction type jacket, the three pin shaft devices are respectively connected to the lifting lugs, then the second lifting straps are used for connecting with the corresponding pin shaft devices, and then the lifting hooks of the floating crane are hooked on the four connecting lifting straps, so that the hoisting operation of the three-pipe-pile suction type jacket can be realized; when the floating crane aims at the floating crane with larger distance between the lifting hooks, the upper lifting appliance is connected with the lower lifting appliance through the connecting lifting belt, the distance of lifting points is increased, the distance between the lifting hooks of the floating crane is adapted, the limitation of the three-pipe pile suction type guide pipe frame is reduced, and the fault-tolerant rate of offshore operation is improved.

Preferably, the vertical stand that is provided with on the crossbeam, the stand is provided with three oblique pull rod along its circumference interval, two liang contained angle between the oblique pull rod is 120, the position and the quantity that the crossbeam corresponds three oblique pull rod are provided with three level and prop, the one end and the stand of oblique pull rod are connected, and the other end props the one end of keeping away from the crossbeam with the level and passes through the second to hang the belting hub connection and form the rotation and be connected, and is three the second suspender is connected respectively at three second to hang the belting epaxially.

By adopting the technical scheme, the three second hanging strips are respectively connected with the three second hanging strips through the shafts, and then the three second hanging strips are respectively connected with the three pin shaft devices, so that the connection between the three tubular pile suction type guide pipe frame and the lower hanging device is realized, and the lifting operation of the three tubular pile suction type guide pipe frame can be realized; in addition, a triangle is formed among the diagonal draw bars, the upright posts and the corresponding horizontal braces, so that the loads of the three hoisting points are converged to the central point, and the bearing capacity of the lower lifting appliance is improved.

Preferably, the crossbeam is provided with two compensating beams along its length direction interval, two the length direction of compensating beam is parallel, wherein two first string of taking the axle to set up respectively at the both ends of one of them compensating beam, two in addition first string of taking the axle to set up respectively at the both ends of another compensating beam.

Through adopting above-mentioned technical scheme, four first hanging band axles set up on two compensating beams, and four are connected the suspender and are connected respectively at four first hanging band epaxially, and when the floating crane lifting hook interval was less, can directly be connected with four connection suspenders, realize the hoist and mount operation to three tubular pile suction type jacket, when the floating crane lifting hook interval was great, be connected four hanging wheels and four connection suspenders of frame roof beam, then the floating crane lifting hook is connected with four first connection suspenders on the frame roof beam, realizes the hoist and mount to three tubular pile suction type jacket.

Preferably, the cross beam is provided with two cross hinged beams corresponding to the two balance beams, the balance beams are hinged to the corresponding cross hinged beams, and the rotating directions of the balance beams are parallel to and perpendicular to the length direction of the cross beam.

Through adopting above-mentioned technical scheme, the compensating beam is articulated with the cross articulated beam, has realized promptly that the compensating beam is horizontal and fore-and-aft rotates, when the floating crane lifting hook is direct to be connected with the connection suspender, can make the deviation that takes place certain angle for the connection suspender, can the different floating crane lifting hook intervals of adaptation.

Preferably, the round pin axle device includes sleeve, hanging axle, driving piece and cardboard, the sleeve passes through the bolt fastening in the week side of otic placode worn to establish the hole, the hanging axle slides and connects in the sleeve, the driving piece sets up on the sleeve, driving piece drive hanging axle slides, just the hanging axle slides and wears to establish downtheholely at two, works as behind the otic placode is worn out to the tip of hanging axle, the cardboard joint is at the tip of hanging axle to fix on the otic placode through the bolt.

Through adopting above-mentioned technical scheme, before carrying out the hoist and mount operation, fix the sleeve in the week side of one of them otic placode through-hole, then utilize driving piece drive to hang axial opposite side otic placode and slide, simultaneously with the second suspender around establishing on hanging the axle, continue to drive immediately and hang the axle and slide, pass through the through-hole of another otic placode until hanging the axle, then tip and the tip joint of hanging the axle to fix on the otic placode through the bolt, realize promptly that hoist and three tubular pile suction type jackets are connected down.

Preferably, the driving part is set as a screw rod, the screw rod is rotatably connected in the sleeve, the length direction of the screw rod is parallel to the sliding direction of the hanging shaft, the screw rod is in threaded connection with the hanging shaft, and a hand wheel is arranged at one end, far away from the hanging shaft, of the screw rod.

Through adopting above-mentioned technical scheme, rotate the hand wheel, drive the screw rod and rotate, because hanging axle and screw rod threaded connection, the hanging axle can take place to slide, realizes the sliding motion of hanging axle promptly.

Preferably, it is three the diagonal draw bar all articulates on the stand, and is three the level props all articulates on the crossbeam, the axis of rotation of diagonal draw bar is parallel with the axis of rotation that the level that corresponds propped, the stand goes up and down to set up on the crossbeam, and the axis of rotation that all diagonal draw bars and all levels propped is perpendicular with the direction of lift of stand, be provided with the lift piece that is used for driving the stand to go up and down on the crossbeam.

Through adopting above-mentioned technical scheme, utilize lift drive stand to go up and down for the one end of diagonal draw bar goes up and down, and then makes the second hang the tape spool and take place slight skew from top to bottom, thereby changes the distance between the three hoisting point, helps the hoist and mount action of the three tubular pile suction type jackets of the different specifications of adaptation.

Preferably, the lifting piece is a hydraulic cylinder, the hydraulic cylinder is arranged on the cross beam, the end part of a piston rod of the hydraulic cylinder is vertically and upwards arranged, and the upright column is fixedly connected with the end part of a piston rod of the hydraulic cylinder.

By adopting the technical scheme, the lifting piece is arranged as the hydraulic cylinder, and the lifting motion of the upright post can be realized by operating the hydraulic cylinder.

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

by utilizing the detachable connection relationship between the upper lifting appliance and the lower lifting appliance, when the distance between the lifting hooks of the floating lifting appliance is small, the lifting hooks of the floating lifting appliance are directly connected with the lower lifting appliance to lift the three-pipe-pile suction type jacket, when the distance between the lifting hooks of the floating lifting appliance is large, the upper lifting appliance is connected with the lower lifting appliance to increase the distance between four lifting points so as to adapt to the distance between the lifting hooks of the floating lifting appliance, and the lifting is beneficial to enabling the three-pipe-pile suction type jacket to be adaptive to different floating lifting, namely reducing the limitation of the three-pipe-pile suction type jacket in the lifting process;

by means of the cross hinged beam, the balance beam can slightly deviate, and the lower lifting appliance is suitable for floating cranes with more specifications;

the hydraulic cylinder drives the upright column to lift, and the distance between three lifting points below the lower lifting appliance is adjusted, so that the lifting action of the three-pipe pile suction type jacket adaptive to different specifications is facilitated.

Drawings

Fig. 1 is a schematic view of an overall structure of a three-pipe pile suction type jacket in the background art of the present application;

FIG. 2 is an enlarged view of a portion A of FIG. 1, which mainly shows the structure of the ear plate and the through hole;

FIG. 3 is a schematic overall structure diagram of a first embodiment of the present application;

fig. 4 is a partial structural sectional view of the first embodiment of the present application, which mainly shows the structure of the pin device;

fig. 5 is a schematic overall structure diagram of the second embodiment of the present application.

Reference numerals: 1. lifting a lifting appliance; 11. a frame beam; 2. a lower lifting appliance; 21. a cross beam; 211. horizontally supporting; 3. a pin shaft device; 31. a sleeve; 32. a hanging shaft; 33. a drive member; 34. clamping a plate; 4. hanging a lug; 5. a first strap; 6. a change gear; 7. a second harness; 8. a first strap shaft; 9. connecting a hanging strip; 10. a column; 101. a diagonal member; 20. a second strap shaft; 30. a balance beam; 40. a cross-shaped hinged beam; 50. a lifting member.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses be applied to hoist and mount of three tubular pile suction jacket.

In the case of the example 1, the following examples are given,

referring to fig. 3, the hoisting device applied to the three-pipe-pile suction type jacket comprises an upper hoisting device 1, a lower hoisting device 2 and a pin shaft device 3 used for being connected with three-pipe-pile suction type jacket lifting lugs, wherein the upper hoisting device 1 comprises a frame beam 11, four hanging lugs 4 are formed on the periphery of the frame beam 11, hanging points of the four hanging lugs 4 are connected to form a rectangular shape, first hanging strips 5 connected with a floating crane lifting hook are arranged at the positions of the four hanging lugs 4 in a winding manner, four hanging wheels 6 are installed in the middle of the frame beam 11, the hanging points of the four hanging wheels 6 are connected to form a rectangular shape, and the rectangular area formed by the four hanging wheels 6 is smaller than the rectangular area formed by the four hanging lugs 4; the lower lifting appliance 2 comprises a cross beam 21, three second lifting belts 7 are wound on the cross beam 21, four first lifting belt shafts 8 are arranged at positions of the cross beam 21 corresponding to the four hanging wheels 6, and connecting lifting belts 9 are connected between the hanging wheels 6 and the corresponding first lifting belt shafts 8; the three pin shaft devices 3 are arranged and correspond to three lifting lugs of the three pipe pile suction type guide pipe racks one by one, the pin shaft devices 3 are detachably connected with the corresponding lifting lugs, and the three second lifting belts 7 are connected with the three pin shaft devices 3 in a one-to-one correspondence mode.

In practice, the three pin shaft devices 3 are respectively connected to the lifting lugs, then the second hanging strips 7 are connected with the corresponding pin shaft devices 3, then the lifting hooks of the floating crane are hooked on the four connecting hanging strips 9, and then the lifting operation of the three-pipe pile suction type jacket can be realized; when the floating crane is used for the floating crane with the larger distance between the lifting hooks, the upper lifting appliance 1 is connected with the lower lifting appliance 2 through the connecting lifting belt 9, the distance of lifting points is increased, the distance between the lifting hooks of the floating crane is adapted, the three-pipe pile suction type guide pipe frame is favorably matched with more floating cranes, and the limitation of the three-pipe pile suction type guide pipe frame is favorably reduced.

Follow vertical direction fixedly connected with stand 10 on the crossbeam 21, stand 10 installs a three oblique pull rod 101 along its axial interval, oblique pull rod 101 is the slope and sets up downwards, contained angle between two liang of oblique pull rods 101 is 120, the position that crossbeam 21 corresponds three oblique pull rod 101 and quantity articulate there is three horizontal brace 211, the one end of oblique pull rod 101 is articulated with stand 10, the one end of keeping away from crossbeam 21 with the horizontal brace 211 that corresponds of oblique pull rod 101 is connected and is formed the rotation through second lacing shaft 20 and is connected, the axis of rotation of oblique pull rod 101 is parallel with the axis of rotation of the horizontal brace 211 that corresponds, and all oblique pull rod 101 and the axis of rotation of all horizontal braces 211 all are horizontal settings, three second braces 7 is respectively around establishing on three second lacing shaft 20.

The second sling 7 is used for connecting the second sling shaft 20 with the corresponding pin shaft device 3, namely, the connection between the lower lifting appliance 2 and the three-pipe pile suction type jacket is realized, wherein a triangle is formed among the diagonal draw bar 101, the upright post 10 and the corresponding horizontal support 211, so that the load of three lifting points is converged to a central point, and the bearing capacity of the lower lifting appliance 2 is improved.

The cross beam 21 is provided with two balance beams 30 along the length direction thereof, the length directions of the two balance beams 30 are parallel to each other and are perpendicular to the length direction of the cross beam 21, wherein two first hanging shafts 8 are respectively installed at two ends of one balance beam 30, and the other two first hanging shafts 8 are respectively installed at two ends of the other balance beam 30. One end of the connecting sling 9 is connected with the hanging wheel 6 of the frame beam 11, and the other end is connected with the first sling shaft 8 on the balance beam 30, namely, the connection between the upper sling 1 and the lower sling 2 is realized.

The cross beam 21 is provided with two cross hinged beams 40 corresponding to the two balance beams 30, the cross hinged beams 40 are hinged on the cross beam 21, the rotating axis is vertical to the length direction of the cross beam 21, the balance beams 30 are hinged on the corresponding cross hinged beams 40, and the rotating axis of the balance beams 30 is parallel to the length direction of the cross beam 21. The balance beam 30 is hinged with the cross-shaped hinged beam 40, namely, the balance beam 30 is rotated transversely and longitudinally, when the floating crane hook is directly connected with the connecting hanging strip 9, the connecting hanging strip 9 can deviate at a certain angle, and the lower lifting appliance 2 can be adapted to floating cranes with different specifications.

Since the three pin devices 3 and the three lifting lugs are connected in the same manner, a description will be given by taking one of the pin devices 3 as an example.

Referring to fig. 3 and 4, the pin device 3 includes a sleeve 31, a hanging shaft 32, a driving part 33 and a clamping plate 34, in practice, the sleeve 31 is fixedly connected to the ear plate through a bolt, the hanging shaft 32 is connected to the sleeve 31 in a sliding manner, and the sliding of the hanging shaft 32 is guided between the hanging shaft 32 and the sleeve 31 through a guide block and a guide slot, and the effect of preventing the hanging shaft 32 from rotating is achieved, and the hanging shaft 32 is arranged in two through holes in a sliding manner, the driving part 33 is provided as a screw rod, the screw rod is connected to the sleeve 31 in a rotating manner, the screw rod is in threaded connection with the hanging shaft 32, the length direction of the screw rod is parallel to the sliding direction of the hanging shaft 32, a hand wheel is installed at one end of the screw rod far from the hanging shaft 32, after the hanging shaft 32 is driven to slide through another ear plate, the clamping plate 34 is clamped to the end of the hanging shaft 32, and then the clamping plate 34 is in threaded connection with the ear plate.

In practice, when carrying out the hoist and mount operation, fix the sleeve 31 in the week side of one of them otic placode through hole, then rotate the hand wheel for the screw rod rotates, and drive hanging shaft 32 slides to the otic placode of opposite side, simultaneously with second suspender 7 around establishing on hanging shaft 32, continue driving hanging shaft 32 to slide immediately, until hanging shaft 32 passes the through hole of another otic placode, then tip and hanging shaft 32's tip joint to fix on the otic placode through the bolt, realize the connection of hoist 2 and three tubular pile suction type pipe racks down promptly.

The implementation principle of the hoisting applied to the three-pipe-pile suction type jacket in the embodiment of the application is as follows: the method comprises the steps of firstly installing a pin shaft device 3 on an ear plate, simultaneously connecting a second hanging strip 7 with a hanging shaft 32, realizing the connection of a lower hanging tool 2 and a three-pipe-pile suction type jacket, directly connecting a floating hanging hook with four connecting hanging strips 9 when the distance between the floating hanging hook is small, realizing the hanging operation of the three-pipe-pile suction type jacket, increasing an upper hanging tool 1 on the lower hanging tool 2 when the distance between the floating hanging hooks is large, increasing the distance between four hanging points, enabling the integral hanging to be matched with the distance between the floating hanging hooks, facilitating the hanging operation, and being beneficial to enabling the three-pipe-pile suction type jacket to be matched with more floating hanging tools by utilizing the hanging tools, namely reducing the limitation of the hanging of the three-pipe-pile suction type jacket.

In the case of the example 2, the following examples are given,

referring to fig. 5, the present embodiment is different from embodiment 1 in that a cross beam 21 is provided with a lifting member 50, the lifting member 50 is provided as a hydraulic cylinder, the hydraulic cylinder is fixedly mounted on the cross beam 21, a piston rod of the hydraulic cylinder is vertically arranged upwards, and a column 10 is fixedly connected to an end of the hydraulic cylinder.

In practice, the hydraulic cylinder is used for driving the upright post 10 to lift, so that one end of the inclined pulling cylinder is lifted, the second hanging belt shaft 20 is driven to deviate, the positions of three lifting points are changed, the three-pipe pile suction type jacket is favorably matched with three-pipe pile suction type jacket frames of different specifications, and the applicability of the lifting is favorably improved.

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 (8)

1. The utility model provides a be applied to hoist and mount of three tubular pile suction jacket which characterized in that: the lifting device comprises an upper lifting appliance (1), a lower lifting appliance (2) and a pin shaft device (3) used for being connected with a three-pipe-pile suction type jacket lifting lug, wherein the upper lifting appliance (1) comprises a frame beam (11), four hanging lugs (4) are formed on the periphery of the frame beam (11), first hanging strips (5) connected with a floating crane lifting hook are wound at the four hanging lugs (4), and four hanging wheels (6) are installed in the middle of the frame beam (11); lower hoist (2) include crossbeam (21), around being equipped with three second suspender (7) on crossbeam (21), the position that crossbeam (21) corresponds four change gear (6) is provided with four first suspender axles (8), be connected with between change gear (6) and the first suspender axle (8) that corresponds and connect suspender (9), round pin axle device (3) are provided with threely, with the three lug one-to-one of three tubular pile suction type pipe racks, just round pin axle device (3) can be dismantled with the lug that corresponds and be connected threely second suspender (7) are connected with three round pin axle device (3) one-to-one.

2. The hoisting device applied to the three-pipe-pile suction type jacket according to claim 1 is characterized in that: the vertical stand (10) that is provided with on crossbeam (21), stand (10) are provided with three oblique pull rod (101) along its circumference interval, two liang contained angle between oblique pull rod (101) is 120, crossbeam (21) correspond the position and the quantity of three oblique pull rod (101) and are provided with three level and prop (211), the one end and the stand (10) of oblique pull rod (101) are connected, and the other end props (211) with the level and keeps away from the one end of crossbeam (21) and is connected and form through second suspender axle (20) and rotate and be connected, and is three second suspender (7) are connected respectively on three second suspender axle (20).

3. The hoisting device applied to the three-pipe-pile suction type jacket as claimed in claim 2, is characterized in that: the beam (21) is provided with two balance beams (30) at intervals along the length direction of the beam, the length directions of the two balance beams (30) are parallel, two first hanging belt shafts (8) are respectively arranged at two ends of one balance beam (30), and the other two first hanging belt shafts (8) are respectively arranged at two ends of the other balance beam (30).

4. The hoisting device applied to the three-pipe-pile suction type jacket according to claim 3 is characterized in that: the position that crossbeam (21) corresponds two compensating beams (30) is provided with two cross articulated roof beams (40), compensating beam (30) articulate on corresponding cross articulated roof beam (40), the rotation direction of compensating beam (30) is the length direction of parallel and perpendicular crossbeam (21).

5. The hoisting device applied to the three-pipe-pile suction type jacket according to claim 1 is characterized in that: round pin axle device (3) include sleeve (31), hang axle (32), driving piece (33) and cardboard (34), sleeve (31) pass through the bolt fastening in the week side of otic placode through-hole, hang axle (32) and slide and connect in sleeve (31), driving piece (33) set up on sleeve (31), driving piece (33) drive hangs axle (32) and slides, just hang axle (32) and slide in two through-holes, work as behind the otic placode is worn out to the tip of hanging axle (32), cardboard (34) joint is at the tip of hanging axle (32) to fix on the otic placode through the bolt.

6. The hoisting device applied to the three-pipe pile suction type jacket as claimed in claim 5, is characterized in that: the driving piece (33) is arranged as a screw rod, the screw rod is connected in the sleeve (31) in a rotating mode, the length direction of the screw rod is parallel to the sliding direction of the hanging shaft (32), the screw rod is connected with the hanging shaft (32) in a threaded mode, and a hand wheel is arranged at one end, far away from the hanging shaft (32), of the screw rod.

7. The hoisting device applied to the three-pipe-pile suction type jacket as claimed in claim 2, is characterized in that: it is three to draw pole (101) to one side all to articulate on stand (10), it is three the level props (211) and all articulates on crossbeam (21), the axis of rotation of drawing pole (101) to one side is parallel with the axis of rotation that the level that corresponds propped (211), stand (10) goes up and down to set up on crossbeam (21), and all draw pole (101) and all levels to one side prop the axis of rotation of (211) and the direction of lift of stand (10) perpendicular, be provided with on crossbeam (21) and be used for driving stand (10) to carry out lift piece (50) that go up and down.

8. The hoisting device applied to the three-pipe-pile suction type jacket as claimed in claim 7, is characterized in that: the lifting piece (50) is arranged to be a hydraulic cylinder, the hydraulic cylinder is arranged on the cross beam (21), the end part of a piston rod of the hydraulic cylinder is vertically and upwards arranged, and the upright column (10) is fixedly connected with the end part of a piston rod of the hydraulic cylinder.

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