CN112077522B

CN112077522B - Pipeline construction port plugging device

Info

Publication number: CN112077522B
Application number: CN202010922201.2A
Authority: CN
Inventors: 赵亚威
Original assignee: Zhuji Dinghong Construction Co ltd
Current assignee: Zhuji Dinghong Construction Co ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-04-22
Anticipated expiration: 2040-09-04
Also published as: CN112077522A

Abstract

The invention provides pipeline construction port plugging equipment, which belongs to the technical field of pipeline construction equipment and comprises an installation component, a moving component, a rotating component and an adjusting component, wherein an installation plate of the installation component is arranged on the outer side of an installation box, and a first fixing plate and a second fixing plate are fixed on the installation plate; a first motor of the moving assembly is fixed on the first fixing plate, one end of a first lead screw is fixed on the first motor, the other end of the first lead screw is arranged on the second fixing plate, and a first moving block is arranged on the first lead screw; a supporting seat in the rotating assembly is fixed on the first moving block, the second motor is fixed on the supporting seat, and the rotating disc is fixed on the second motor; the knob of the adjusting assembly is arranged on the rotating disk, one end of the second lead screw is fixed on the knob, the other end of the second lead screw is arranged on the rotating disk, the second moving block is arranged on the second lead screw, and the welding head is fixed on the second moving block. The device can automatically weld the pipeline without manual welding, thereby reducing the labor amount of workers and achieving high working efficiency.

Description

Pipeline construction port plugging device

Technical Field

The invention relates to the technical field of pipeline construction equipment, in particular to pipeline construction port plugging equipment.

Background

The pipeline engineering is the pipeline construction for conveying oil products, natural gas and solid slurry. Including pipeline line engineering, station depot engineering and pipeline auxiliary engineering. Plumbing in a broad sense also includes equipment and equipment supplies. The pipeline engineering is that pipe, pipe fitting, valve, etc. are used to connect the pipeline starting station, intermediate station and destination station to constitute pipeline transportation. Is the main body part of the pipeline engineering.

Generally need carry out the shutoff to the terminal port of pipeline, present shutoff mode is mostly the blanking cover on pipeline port welding, and the welding blanking cover is artifical manual welding usually, because the pipeline generally buries in underground foundation ditch, the foundation ditch space is little, and the workman is little when the foundation ditch welds, and the welding is inconvenient, leads to welding inefficiency, and welding quality is poor, and workman's working strength is big.

Disclosure of Invention

In order to make up for the defects, the invention provides pipeline construction port plugging equipment, and aims to solve the problems of low welding efficiency, poor welding quality and high working strength of workers caused by small working space and inconvenient welding when the workers perform pipeline plugging cover welding in a foundation pit at present.

The invention is realized by the following steps: the invention provides a pipeline construction port plugging device which comprises a mounting assembly, a moving assembly, a rotating assembly and an adjusting assembly, wherein the moving assembly is mounted on the mounting assembly, the rotating assembly is mounted on the moving assembly, the adjusting assembly is mounted on the rotating assembly, the moving assembly realizes the forward and backward movement of a welding head, the rotating assembly realizes the circumferential rotation motion of the welding head, and the adjusting assembly realizes the position adjustment of the welding head on a rotating disc.

The installation component comprises an installation box, an installation plate, an installation seat, a first fixing plate and a second fixing plate, wherein the installation plate is arranged on the outer side of the installation box, the installation seat is fixedly installed on the installation plate, the first fixing plate and the second fixing plate are respectively arranged at the end parts of the two ends of the installation seat, and the first fixing plate and the second fixing plate are fixedly installed on the installation plate.

The moving assembly comprises a first motor, a first lead screw and a first moving block, the first motor is fixedly mounted on the first fixing plate, one end of the first lead screw is fixedly mounted on an output shaft of the first motor, the other end of the first lead screw is rotatably mounted on the second fixing plate, and the first moving block is arranged on the first lead screw.

The rotating assembly comprises a supporting seat, a second motor and a rotating disk, the supporting seat is fixedly installed on the first moving block, the second motor is fixedly installed on the supporting seat, and the rotating disk is fixedly installed on an output shaft of the second motor.

The adjusting assembly comprises a knob, a second lead screw, a second moving block and a welding head, the knob is arranged on the rotating disc, one end of the second lead screw is fixedly arranged on the knob, the other end of the second lead screw is rotatably arranged on the rotating disc, the second moving block is arranged on the second lead screw, a first sliding groove is formed in the rotating disc, the second moving block slides in the first sliding groove, and the welding head is fixedly arranged on the second moving block.

In an embodiment of the present invention, the locking device further includes a locking assembly, the locking assembly includes a locking pin, an elastic member, and a plug screw, the locking pin is inserted into the knob, the rotating disk is provided with a plurality of locking grooves, one end of the locking pin can be clamped in the locking grooves, one end of the elastic member is disposed at one end of the locking pin away from the locking grooves, the other end of the elastic member abuts against the plug screw, the plug screw is fixedly mounted on the knob, and the elastic member is disposed in the knob.

In an embodiment of the present invention, the mounting box further includes a lifting assembly, the lifting assembly includes a third motor, a third lead screw, a lifting plate and a connecting rod, the third motor is fixedly installed inside the mounting box, one end of the third lead screw is fixedly installed on the third motor, the other end of the third lead screw is rotatably installed on the mounting box, the lifting plate is disposed on the third lead screw, the lifting plate is disposed inside the mounting box, the connecting rod is fixedly installed on the lifting plate, and the connecting rod penetrates through the mounting box and is fixedly connected with the mounting base.

In an embodiment of the invention, first limiting blocks are fixed on two sides of the interior of the installation box, and the first limiting blocks can be abutted against the lifting plate.

In an embodiment of the present invention, a second limiting block is fixed to an end of the locking pin away from the locking groove, the second limiting block is disposed in the knob, and the second limiting block abuts against an end of the elastic member away from the plug screw.

In one embodiment of the invention, the outer circumferential surface of the knob is provided with anti-skid grains.

In an embodiment of the invention, sliding seats are fixed on both sides of one end of the supporting seat, which is far away from the second motor, and guide rails are slidably connected in the sliding seats and fixedly installed on the installation seat.

In an embodiment of the present invention, two sides of the first sliding groove are both provided with a second sliding groove, two sides of the second moving block are both fixed with a sliding block, and the sliding block can be accommodated in the second sliding groove and slide along the second sliding groove.

In one embodiment of the invention, handles are fixedly arranged on both sides of the installation box.

In one embodiment of the invention, self-locking universal wheels are fixedly mounted at four corners of the bottom end of the mounting box.

The invention has the beneficial effects that: when the pipeline construction port plugging device is used, the first motor drives the first lead screw to rotate, the first lead screw drives the first movable block to move along the first lead screw, the first movable block drives the supporting seat to move back and forth, and the welding head is arranged on the supporting seat, so that the back and forth movement of the welding head is realized, and the adjustment of the distance between the welding head and a pipeline to be welded is realized;

the rotating disc is driven to rotate by the second motor, the welding head is arranged on the rotating disc and then rotates along with the welding disc, and the welding head does circular motion around the pipeline to be welded, so that the pipeline is integrally welded;

the knob drives the second lead screw to rotate, the second lead screw drives the second moving block to move along the second lead screw, the second moving block slides on the rotating disk along the first sliding groove, the welding head is fixed on the second moving block, the position of the welding head on the rotating disk is adjusted, the rotating diameter of the welding head is changed, and pipelines with different diameters can be plugged and welded;

automatic welding work is carried out to the shutoff of pipeline port automatically through above-mentioned device, need not artifical manual welding, alleviates workman's the amount of labour, and welding work efficiency is high, and welding quality is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic perspective view of an apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the apparatus according to the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mobile assembly according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an exploded view of a conditioning assembly according to an embodiment of the present invention;

FIG. 5 is an enlarged view taken at A of FIG. 4 according to the present invention;

fig. 6 is a schematic structural diagram of a locking assembly according to an embodiment of the present invention.

In the figure: 1-mounting the assembly; 1 a-an installation box; 1a 1-handle; 1a 2-self-locking universal wheel; 1 b-a mounting plate; 1 c-a mounting seat; 1 d-a first fixing plate; 1 e-a second fixation plate; 2-a moving assembly; 2 a-a first motor; 2 b-a first screw rod; 2 c-a first moving block; 3-a rotating assembly; 3 a-a support seat; 311-sliding seat; 312-a guide rail; 320-a second motor; 3 c-rotating disk; 3c1 — first runner; 3c 11-second runner; 3c 2-locking groove; 4-a regulating component; 4 a-knob; 4a 1-non-slip pattern; 4 b-a second screw rod; 430-a second moving block; 431-a slide block; 4 d-welding head; 5-a locking assembly; 510-a locking pin; 5 a-a second limiting block; 5 b-an elastic member; 5 c-a plug screw; 6-a lifting assembly; 6 a-a third motor; 6 b-a third screw rod; 6 c-a lifter plate; 6 d-connecting rod; 6 e-a first stopper.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

Referring to fig. 1 and fig. 2, the present invention provides a technical solution: the utility model provides a pipeline construction port shutoff equipment, includes installation component 1, removes subassembly 2, rotating assembly 3 and adjusting part 4, wherein, remove subassembly 2 and install on installation component 1, rotating assembly 3 installs on removing subassembly 2, adjusting part 4 installs on rotating assembly 3, remove subassembly 2 and realize that soldered connection 4d back-and-forth movement, rotating assembly 3 realizes soldered connection 4d along circular rotary motion, adjusting part 4 realizes the position control of soldered connection 4d on rotary disk 3 c.

Referring to fig. 2 and 3, the mounting assembly 1 includes a mounting box 1a, a mounting plate 1b, a mounting base 1c, a first fixing plate 1d and a second fixing plate 1e, the mounting plate 1b is disposed on the outer side of the top end of the mounting box 1a, the mounting base 1c is fixedly mounted on two sides of the upper surface of the mounting plate 1b through bolts, the first fixing plate 1d and the second fixing plate 1e are respectively disposed on the end portions of two ends of the mounting base 1c, and the first fixing plate 1d and the second fixing plate 1e are both fixedly mounted on the upper surface of the mounting plate 1b through bolts.

Referring to fig. 2, in the specific setting, handles 1a1 are fixedly mounted at the outer ends of the two sides of the mounting box 1a through bolts, so that the whole device can be conveniently pulled to move by hands through the handles 1a 1. All fixed mounting has auto-lock universal wheel 1a2 in the bottom four corners position of install bin 1a, makes things convenient for the removal and the fixed of whole device, improves the mobility and the flexibility of whole device.

Referring to fig. 2 and 3, the moving assembly 2 includes a first motor 2a, a first lead screw 2b and a first moving block 2c, the first motor 2a is fixedly mounted in the middle of the outer side of a first fixing plate 1d through a bolt, the first motor 2a is a servo motor, one end of the first lead screw 2b is fixedly mounted at the end of an output shaft of the first motor 2a through a coupler, the other end of the first lead screw 2b is rotatably mounted in the middle of a second fixing plate 1e through a bearing, and the first moving block 2c is in threaded transmission connection with the first lead screw 2b, so that the first moving block 2c can move back and forth along the first lead screw 2 b.

Referring to fig. 2 and 3, preferably, in an embodiment of the present invention, sliding seats 311 are fixed to both sides of the lower end of the supporting seat 3a through bolts, a guide rail 312 is connected in the sliding seat 311 in a sliding manner, the guide rail 312 is fixedly installed on the mounting seat 1c through bolts, and the supporting seat 3a slides along the guide rail 312 under the driving of the sliding seat 311, so as to reduce friction and reduce energy consumption.

Referring to fig. 2, the rotating assembly 3 includes a supporting base 3a, a second motor 320 and a rotating disc 3c, the supporting base 3a is fixedly mounted at the upper end of the first moving block 2c by welding, the second motor 320 is fixedly mounted at the upper end of the supporting base 3a by bolts, the second motor 320 is a servo motor, the rotating disc 3c is fixedly mounted at the end of the output shaft of the second motor 320, and the rotating disc 3c is disposed at one side of the supporting base 3a far away from the second motor 320, so as to realize the rotating motion of the rotating disc 3 c.

Referring to fig. 4 and 5, the adjusting assembly 4 includes a knob 4a, a second lead screw 4b, a second moving block 430 and a welding head 4d, the knob 4a is disposed on an outer cylindrical surface of the rotating disc 3c, a platform is disposed in an area of the rotating disc 3c where the knob 4a is disposed, so as to facilitate installation and operation of the knob 4a, one end of the second lead screw 4b is fixedly mounted in the middle of the inside of the knob 4a through a key, the other end of the second lead screw 4b is rotatably mounted in the rotating disc 3c through a bearing, the second moving block 430 is in threaded transmission connection with the second lead screw 4b, the rotating disc 3c is provided with a first sliding groove 3c1, the second moving block 430 slides in the first sliding groove 3c1, the welding head 4d is fixedly mounted on the second moving block 430 through a bolt, the welding head 4d is connected with a welding machine through a pipeline, and the welding head 4d can achieve welding work.

Referring to fig. 4, in a specific configuration, the second sliding grooves 3c11 are formed on both sides of the first sliding groove 3c1, the sliding blocks 431 are fixed on both sides of the second moving block 430, and the sliding blocks 431 can be accommodated in the second sliding grooves 3c11 and slide along the second sliding grooves 3c11 to limit and guide the second moving block 430 when sliding in the first sliding groove 3c 1.

Referring to fig. 5 and fig. 6, in an embodiment of the present invention, the locking assembly 5 further includes a locking pin 510, an elastic member 5b and a plug screw 5c, the locking pin 510 is inserted into one side of the knob 4a, the rotating disc 3c is provided with a plurality of locking grooves 3c2, one end of the locking pin 510 can be clamped in the locking grooves 3c2, it should be noted that the end of the locking pin 510 is provided with a ball head shape, the locking grooves 3c2 are spherical grooves, the locking grooves and the spherical grooves can be mutually matched and clamped together to lock and fix the locking pin 510, one end of the elastic member 5b is provided at one end of the locking pin 510 away from the locking grooves 3c2, the elastic member 5b can be a spring, the other end of the elastic member 5b abuts against the plug screw 5c, the plug screw 5c is fixedly installed on the knob 4a, and the elastic member 5b is disposed in the knob 4 a.

Referring to fig. 6, in the present application, a second limiting block 5a is fixed at an end of the locking pin 510 away from the locking groove 3c2, the second limiting block 5a is disposed in the knob 4a, and the second limiting block 5a and an end of the elastic member 5b away from the plug screw 5c are abutted to prevent the locking pin 510 from sliding out of the knob 4a under the elastic force of the elastic member 5b, so as to perform limiting and protecting functions. Optionally, an anti-slip pattern 4a1 is disposed on the outer circumferential surface of the knob 4a to increase the friction between the hand and the knob 4a, so as to facilitate the rotation of the knob 4a by hand.

Referring to fig. 2, in addition, in an embodiment of the present invention, the present invention further includes a lifting assembly 6, the lifting assembly 6 includes a third motor 6a and a third screw rod 6b, lifter plate 6c and connecting rod 6d, third motor 6a passes through bolt fixed mounting in the middle of the inside bottom of install bin 1a, third motor 6a is servo motor, the lower extreme fixed mounting of third lead screw 6b is in the output shaft tip of third motor 6a, the upper end of third lead screw 6b is passed through the bearing and is rotated and install in the top of install bin 1a, lifter plate 6c screw thread transmission is on third lead screw 6b, lifter plate 6c sets up in the inside of install bin 1a, connecting rod 6d is provided with four, four connecting rods 6d pass through welded fastening and install in the higher authority four corners position of lifter plate 6c, connecting rod 6d runs through install bin 1a and passes through welded fastening with mount pad 1c and be connected.

Referring to fig. 2, in the specific setting, the lower ends of the two sides of the inside of the installation box 1a are respectively fixed with a first limiting block 6e, the lifting plate 6c is arranged above the first limiting block 6e, the first limiting block 6e can abut against the lifting plate 6c, when the lifting plate 6c moves downwards to abut against the first limiting block 6e, the lifting plate 6c stops moving, the collision with the lower third motor 6a is avoided, and the limiting protection effect is achieved.

Specifically, the working principle of the pipeline construction port plugging device is as follows: when the device is used, the whole device is firstly placed near a pipeline port, then the third motor 6a is started, then the third motor 6a drives the third screw rod 6b to rotate, then the third screw rod 6b drives the lifting plate 6c to move upwards along the third screw rod 6b, then the lifting plate 6c drives the connecting rod 6d to move upwards, further the connecting rod 6d drives the mounting seat 1c to move upwards, the rotating disc 3c is arranged on the mounting seat 1c, further the rotating disc 3c realizes the upward movement, and the rotating disc 3c stops moving upwards until the central height of the rotating disc 3c is equal to the central height of a pipeline;

then the installation box 1a is moved through the self-locking universal wheel 1a2, and then the installation box 1a drives the whole device to move until the rotary disk 3c and the pipeline are coaxially positioned and then stop moving, so that the position adjustment of the rotary disk 3c is realized;

then, the knob 4a is rotated by hand, the knob 4a drives the second lead screw 4b to rotate, the second lead screw 4b drives the second moving block 430 to slide along the first sliding groove 3c1, the second moving block 430 realizes position adjustment on the rotating disk 3c, a welding head 4d is fixed on the second moving block 430, the rotating circumferential diameter of the welding head 4d is adjusted, and the position of the welding head 4d is adjusted according to the diameter of the pipeline port;

when the knob 4a is turned by hand, the knob 4a drives the locking pin 510 to rotate, and then the locking pin 510 comes out of one locking groove 3c2, the knob 4a continues to rotate, and the locking pin 510 enters the next adjacent locking groove 3c2 under the elastic force of the elastic piece 5b to realize locking of the knob 4a, which is performed in sequence and circularly, and when the position of the welding head 4d is adjusted, the knob 4a is simultaneously locked, so that the welding head 4d is prevented from moving and a fixing effect is realized;

then, the first motor 2a is started, the first motor 2a drives the first lead screw 2b to rotate, the first lead screw 2b drives the first moving block 2c to move forwards along the first lead screw 2b, the first moving block 2c drives the supporting seat 3a to move forwards and backwards, and the welding head 4d is arranged on the supporting seat 3a, so that the welding head 4d moves forwards, and the distance between the welding head 4d and a pipeline to be welded is adjusted;

after the distance between the welding head 4d and the pipeline port is adjusted, the second motor 320 is started, the second motor 320 drives the rotating disk 3c to rotate, the welding head 4d is arranged on the rotating disk 3c, the welding head 4d rotates along with the rotating disk 3c, meanwhile, the welding head 4d works to weld, the welding head 4d performs circular motion around the pipeline to be welded, in order to avoid the winding situation of the pipeline connected with the welding head 4d, the welding head 4d rotates clockwise for one circle around the pipeline port and then rotates anticlockwise for one circle, and the circular welding is performed according to the above operation, and the integral welding of the pipeline port is further realized;

it should be noted that the specific model specifications of the first motor 2a, the second motor 320, and the third motor 6a need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art, so detailed description is omitted.

The power supply of the first motor 2a, the second motor 320 and the third motor 6a and the principle thereof will be clear to the skilled person and will not be described in detail here.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A pipeline construction port plugging device is characterized by comprising

The mounting assembly (1) comprises a mounting box (1 a), a mounting plate (1 b), a mounting seat (1 c), a first fixing plate (1 d) and a second fixing plate (1 e), wherein the mounting plate (1 b) is arranged on the outer side of the mounting box (1 a), the mounting seat (1 c) is fixedly mounted on the mounting plate (1 b), the first fixing plate (1 d) and the second fixing plate (1 e) are respectively arranged at the end parts of the two ends of the mounting seat (1 c), and the first fixing plate (1 d) and the second fixing plate (1 e) are both fixedly mounted on the mounting plate (1 b);

the moving assembly (2) comprises a first motor (2 a), a first lead screw (2 b) and a first moving block (2 c), the first motor (2 a) is fixedly installed on the first fixing plate (1 d), one end of the first lead screw (2 b) is fixedly installed on an output shaft of the first motor (2 a), the other end of the first lead screw (2 b) is rotatably installed on the second fixing plate (1 e), and the first moving block (2 c) is arranged on the first lead screw (2 b);

the rotating assembly (3) comprises a supporting seat (3 a), a second motor (320) and a rotating disk (3 c), the supporting seat (3 a) is fixedly installed on the first moving block (2 c), the second motor (320) is fixedly installed on the supporting seat (3 a), and the rotating disk (3 c) is fixedly installed on an output shaft of the second motor (320);

the adjusting assembly (4) comprises a knob (4 a), a second lead screw (4 b), a second moving block (430) and a welding head (4 d), the knob (4 a) is arranged on the rotating disc (3 c), one end of the second lead screw (4 b) is fixedly arranged on the knob (4 a), the other end of the second lead screw (4 b) is rotatably arranged on the rotating disc (3 c), the second moving block (430) is arranged on the second lead screw (4 b), a first sliding groove (3 c 1) is formed in the rotating disc (3 c), the second moving block (430) slides in the first sliding groove (3 c 1), and the welding head (4 d) is fixedly arranged on the second moving block (430);

the locking mechanism is characterized by further comprising a locking assembly (5), wherein the locking assembly (5) comprises a locking pin (510), an elastic piece (5 b) and a plug screw (5 c), the locking pin (510) is inserted into the knob (4 a), the rotating disc (3 c) is provided with a plurality of locking grooves (3 c 2), one end of the locking pin (510) can be clamped in the locking groove (3 c 2), one end of the elastic piece (5 b) is arranged at one end, far away from the locking groove (3 c 2), of the locking pin (510), the other end of the elastic piece (5 b) is abutted against the plug screw (5 c), the plug screw (5 c) is fixedly arranged on the knob (4 a), and the elastic piece (5 b) is arranged in the knob (4 a);

the lifting device is characterized by further comprising a lifting assembly (6), wherein the lifting assembly (6) comprises a third motor (6 a), a third screw rod (6 b), a lifting plate (6 c) and a connecting rod (6 d), the third motor (6 a) is fixedly installed inside the installation box (1 a), one end of the third screw rod (6 b) is fixedly installed on the third motor (6 a), the other end of the third screw rod (6 b) is rotatably installed on the installation box (1 a), the lifting plate (6 c) is arranged on the third screw rod (6 b), the lifting plate (6 c) is arranged inside the installation box (1 a), the connecting rod (6 d) is fixedly installed on the lifting plate (6 c), and the connecting rod (6 d) penetrates through the installation box (1 a) and is fixedly connected with the installation seat (1 c);

a first limiting block (6 e) is fixed on each of two sides of the interior of the installation box (1 a), and the first limiting blocks (6 e) can be abutted against the lifting plate (6 c);

a second limiting block (5 a) is fixed at one end, far away from the locking groove (3 c 2), of the locking pin (510), the second limiting block (5 a) is arranged in the knob (4 a), and the second limiting block (5 a) is abutted against one end, far away from the screw plug (5 c), of the elastic piece (5 b);

the outer circumferential surface of the knob (4 a) is provided with anti-skid grains (4 a 1);

both sides of one end, far away from the second motor (320), of the supporting seat (3 a) are fixedly provided with sliding seats (311), the sliding seats (311) are connected with guide rails (312) in a sliding manner, and the guide rails (312) are fixedly arranged on the mounting seat (1 c);

two sides of the first sliding groove (3 c 1) are respectively provided with a second sliding groove (3 c 11), two sides of the second moving block (430) are respectively fixed with a sliding block (431), and the sliding blocks (431) can be contained in the second sliding groove (3 c 11) and slide along the second sliding groove (3 c 11);

handles (1 a 1) are fixedly arranged on two sides of the mounting box (1 a);

and self-locking universal wheels (1 a 2) are fixedly mounted at four corners of the bottom end of the mounting box (1 a).