CN112155891A

CN112155891A - Nursing wheelchair bed can be dismantled in integration

Info

Publication number: CN112155891A
Application number: CN202011184767.6A
Authority: CN
Inventors: 许有绝
Original assignee: Shengzhou Fengpu Medical Equipment Technology Co ltd
Current assignee: Shengzhou Fengpu Medical Equipment Technology Co ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-01-01

Abstract

The invention relates to the field of medical care, in particular to an integrated detachable nursing wheelchair bed, which comprises a bed head body and bed tail bodies which are positioned at the right side of the bed head body and symmetrically arranged front and back, the bed tail body is fixedly connected with the bed head body by using a bed body supporting frame, a bed head plate is rotatably arranged between the front end wall and the rear end wall of the bed body supporting frame, a machine body is arranged between the two bed body supporting frames in a left-right sliding manner, the integrated detachable nursing wheelchair bed can be transformed into a wheelchair and a bed, is convenient for patients and caregivers to use, is convenient to nurse and save space, the patient is positioned in the center of the wheelchair bed, the moving spaces on two sides are abundant, the experience of the patient is good, and the patient can autonomously control to move when being transformed into the wheelchair state, so that the actual labor intensity of the nursing staff can be effectively reduced.

Description

Nursing wheelchair bed can be dismantled in integration

Technical Field

The invention relates to the field of medical nursing, in particular to an integrated detachable nursing wheelchair bed.

Background

The nursing wheelchair bed mainly takes the nursing wheelchair bed as a main part to realize the conversion of the bed and the chair, and on one hand, the nursing wheelchair bed can provide the function of converting from a sickbed to a wheelchair for the disabled and semi-disabled old people or the disabled who lie in bed for a long time, thereby conveniently carrying out daily life, going out and getting rid of mind and the like and greatly improving the daily life quality of patients; on the other hand also can be applied to medical institutions such as hospital and the like to reduce the postoperative patient and need do various examinations, from the sick bed remove to the painful of wheelchair in-process, reduce the secondary injury that the removal in-process probably brought to patient and the heavy work that produces nursing staff simultaneously, current nursing wheelchair bed most only has the function of lying alone and lying down and sitting, be not convenient for realize user's removal and rotation, long-time bed, not only can influence user's mood, also can influence the speed that the health resumes simultaneously, consequently it is necessary to set up the detachable nursing wheelchair bed of an integration and improves above-mentioned problem.

Disclosure of Invention

The invention aims to provide an integrated detachable nursing wheelchair bed, which can overcome the defects in the prior art, so that the practicability of equipment is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to an integrated detachable nursing wheelchair bed, which comprises a bed head body and a bed tail body, wherein the bed tail body is positioned on the right side of the bed head body and symmetrically arranged front and back, the bed tail body is fixedly connected with the bed head body through a bed body supporting frame, a bed head plate is rotatably arranged between the front end wall and the back end wall of the bed body supporting frame, a machine body is arranged between the two bed body supporting frames in a left-right sliding manner, a left-right through opening and closing cavity is arranged in the machine body, a seat plate is fixedly arranged on the upper end wall of the machine body, an upward extending backrest plate is hinged on the left end wall of the seat plate, the backrest plate is connected with the bed head plate through a sliding pin device, a downward extending backrest fixing rod is fixedly arranged on the left end wall of the backrest plate, a downward extending calf plate is hinged on the right end of the seat plate, a rightward extending pedal is hinged, a lower leg connecting rod extending downwards is fixedly arranged on the left end wall of the lower leg plate, a pedal connecting rod extending downwards is hinged at the lower end of the lower leg connecting rod, the lower end of the pedal connecting rod is hinged with the lower end of the pedal supporting rod, a lower leg plate fixing rod extending leftwards and upwards is fixedly arranged at the upper end of the lower leg connecting rod, an opening and closing mechanism for controlling the backrest plate, the lower leg plate and the pedal plate to rotate to open and close is arranged on the upper end wall of the opening and closing cavity, a bevel gear cavity is arranged below the opening and closing cavity in the machine body, storage batteries are symmetrically arranged on the left side and the right side of the bevel gear cavity in the machine body, a forward motor is fixedly arranged on the right end wall of the bevel gear cavity, the forward motor is connected with a forward motor shaft in a leftward power mode, a driving bevel gear cavity, the utility model discloses a portable electric tool, including gear chamber, driving bevel gear, fuselage front and back end wall, charging head, head of a bed body right-hand member wall, the gear chamber is between the setting of using the switch-on of chamber of sliding, driving bevel gear rotates and can drive through advancing the device and be located the advancing wheel constant speed or the differential rotation that the symmetry set up around the fuselage front and back end wall, the fixed head that charges that is provided with of fuselage left end wall, fixed being provided with of head of a bed body right-hand member wall with the.

Furthermore, the sliding pin device comprises sliding pin cavities, openings are symmetrically formed in the front end wall and the rear end wall of the backrest plate, the openings are far away from the symmetric center, a backrest cavity is formed in the headboard and penetrates through the backrest cavity from left to right, sliding pin cylinders are symmetrically and fixedly arranged in the front end wall and the rear end wall of the backrest cavity from front to back, and sliding pins matched with the sliding pin cavities are dynamically arranged on the sliding pin cylinders towards the symmetric center.

Furthermore, the opening and closing mechanism comprises a screw cavity which is communicated with the opening and closing cavity upwards, a leg belt cavity is arranged on the left side of the screw cavity in the machine body, a leg motor is fixedly arranged on the left end wall of the screw cavity, a leg motor shaft which extends into the leg belt cavity leftwards is arranged on the left power of the leg motor, a leg motor belt wheel is fixedly arranged on the left end of the leg motor shaft, leg screw shafts which extend leftwards and rightwards are symmetrically arranged between the screw cavity and the leg belt cavity around the leg motor in a front-back rotating manner, a leg belt wheel is fixedly arranged on the left end of the leg screw shaft, the leg belt wheel is connected with the leg motor belt wheel through a leg belt, a leg screw is fixedly arranged in the screw cavity on the leg screw shaft, and a leg thread block which is meshed with the leg screw is arranged on the leg screw in a left-right, the lower end wall of the leg threaded block is fixedly provided with a control panel extending downwards, the lower end of the control panel is hinged with a lower leg plate connecting rod extending rightwards, the right end of the lower leg plate connecting rod is hinged with the upper end of a lower leg plate fixing rod, the right side of the screw cavity in the machine body is provided with a backrest belt cavity, the right end wall of the screw cavity is fixedly provided with a backrest motor, the backrest motor is powered rightwards and is provided with a backrest motor shaft extending rightwards into the backrest belt cavity, the right end of the backrest motor shaft is fixedly provided with a backrest motor belt, a backrest screw shaft which is required to extend is rotatably arranged between the backrest belt cavity and the screw cavity, the right end of the backrest screw shaft is fixedly provided with a backrest belt pulley connected with the backrest motor belt through a backrest belt, and the backrest screw shaft is positioned in the screw cavity and is fixedly provided with a backrest screw, the backrest screw rod is provided with a screw rod cavity meshed with the backrest screw rod in a left-right sliding mode, a backrest support rod extending downwards is fixedly arranged on the lower end wall of the screw rod cavity, the lower end of the backrest support rod is hinged to a backrest connecting rod extending leftwards, and the left end of the backrest connecting rod is hinged to the lower end of a backrest fixing rod.

Furthermore, the advancing device comprises advancing shafts which are symmetrically and rotationally arranged back and forth between the gear cavity and the front end wall and the rear end wall of the machine body, the advancing wheels are fixedly arranged on the advancing shafts far away from the center of symmetry, advancing gears are fixedly arranged in the gear cavities, driven bevel gear shafts which penetrate through the bevel gear cavities and extend back and forth are rotationally arranged between the two gear cavities, driven bevel gears which are meshed with the driving bevel gears are fixedly arranged in the bevel gear cavities, driving gears are fixedly arranged in the driven bevel gear shafts in the gear cavities, sliding blocks which are symmetrically arranged back and forth are slidably arranged in the sliding cavities, sliding cavities which extend back and forth are rotationally arranged on the sliding blocks, sliding gears which are meshed with the driving gears and the advancing gears are symmetrically arranged at two ends of the sliding cavities, and sliding cylinders are fixedly arranged on the lower end walls of the sliding cavities, the right power of the sliding cylinder is connected with a sliding piston rod, and the right end of the sliding piston rod is fixedly connected with the front side of the rear end wall of the sliding block.

The invention has the beneficial effects that: the integrated detachable nursing wheelchair bed provided by the invention can be transformed into a wheelchair and a bed, is convenient for patients and caregivers to use, is convenient to nurse, saves space, has good patient experience feeling and can autonomously control action when being transformed into a wheelchair state, and the patient is positioned in the center of the wheelchair bed, the moving space on two sides is abundant, and the actual labor intensity of nursing staff can be effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of an integrated detachable nursing wheelchair bed of the invention.

3 fig. 32 3 is 3 a 3 schematic 3 view 3 of 3 the 3 structure 3 a 3- 3 a 3 in 3 fig. 31 3. 3

FIG. 3 is a schematic diagram of B-B in FIG. 1.

Fig. 4 is a schematic view of the structure of C-C in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

With reference to fig. 1-4, the integrated detachable nursing wheelchair bed comprises a bed head 26 and a bed tail 46 symmetrically arranged at the right side of the bed head 26, the bed tail 46 and the bed head 26 are fixedly connected by a bed body supporting frame 27, a head plate 49 is rotatably arranged between the front and rear end walls of the bed body supporting frame 27, a machine body 15 is arranged between the two bed body supporting frames 27 in a left-right sliding manner, a left-right through opening and closing cavity 44 is arranged in the machine body 15, a seat plate 40 is fixedly arranged on the upper end wall of the machine body 15, an upwardly extending back plate 48 is hinged on the left end wall of the seat plate 40, the back plate 48 is connected with the head plate 49 by a sliding pin device 100, a downwardly extending back fixing rod 28 is fixedly arranged on the left end wall of the back plate 48, a downwardly extending shank plate 41 is hinged on the right end of the seat plate 40, the lower end of the shank plate 41 is hinged with a foot pedal 10 extending rightwards, the left side of the lower end wall of the foot pedal 10 is fixedly provided with a pedal support rod 11 extending leftwards and downwards, the left end wall of the shank plate 41 is fixedly provided with a shank connecting rod 13 extending downwards, the lower end of the shank connecting rod 13 is hinged with a foot connecting rod 12 extending downwards, the lower end of the foot connecting rod 12 is hinged with the lower end of the pedal support rod 11, the upper end of the shank connecting rod 13 is fixedly provided with a shank plate fixing rod 42 extending leftwards and upwards, the upper end wall of the opening and closing cavity 44 is provided with an opening and closing mechanism 200 for controlling the rotation opening and closing of the backrest plate 48, the shank plate 41 and the foot pedal 10, a conical tooth cavity 23 is arranged below the opening and closing cavity 44 in the machine body 15, batteries 16 are symmetrically arranged on the left side and the right side of the conical tooth cavity 23, and a forward motor 17 is, the left power of the forward motor 17 is connected with a forward motor shaft 19, the left end of the forward motor shaft 19 is fixedly provided with a drive bevel gear 20, gear cavities 65 are symmetrically arranged in the front and back of the forward motor 17 in the machine body 15, the gear cavities 65 are communicated with each other by a sliding cavity 68, the drive bevel gear 20 can drive forward wheels 18 symmetrically arranged in the front and back of the front and back end walls of the machine body 15 to rotate at a constant speed or at a differential speed by rotating through a forward device 300, the left end wall of the machine body 15 is fixedly provided with a charging head 24, the right end wall of the machine body 26 is fixedly provided with a charging port 25 engaged with the charging head 24, the left end wall of the machine body 26 is fixedly provided with a power line 50, and the upper end wall of the machine.

The sliding pin device 100 comprises a sliding pin cavity 58 which is formed by symmetrically arranging front and back end walls of the backrest plate 48 in a front-back mode and is opened away from a symmetric center, a backrest cavity 47 which penetrates left and right is formed in the headboard 49, sliding pin cylinders 60 are symmetrically and fixedly arranged on the front and back end walls of the backrest cavity 47 in the front-back mode, and sliding pins 59 which are matched with the sliding pin cavity 58 are arranged on the sliding pin cylinders 60 towards the symmetric center.

Beneficially, the opening and closing mechanism 200 includes a screw cavity 71 disposed in the upward opening and closing cavity 44, a leg belt cavity 30 is disposed in the left side of the screw cavity 71 in the body 15, a leg motor 34 is fixedly disposed on the left end wall of the screw cavity 71, the leg motor 34 is dynamically provided with a leg motor shaft 33 extending leftward into the leg belt cavity 30, a leg motor pulley 31 is fixedly disposed on the left end of the leg motor shaft 33, a leg screw shaft 52 extending leftward and rightward is rotationally disposed between the screw cavity 71 and the leg belt cavity 30 in a front-back symmetric manner with respect to the leg motor 34, a leg belt pulley 51 is fixedly disposed on the left end of the leg screw shaft 52, the leg belt pulley 51 is connected with the leg motor pulley 31 by using a leg belt 32, and the leg screw shaft 52 is disposed in the screw cavity 71 and fixedly provided with a leg screw 57, leg screw 57 go up the horizontal slip be provided with leg screw thread piece 53 of leg screw 57 meshing, the fixed control panel 72 that is provided with downwardly extending of terminal wall under leg screw thread piece 53, the articulated shank plate connecting rod 43 that is provided with right extension of control panel 72 lower extreme, shank plate connecting rod 43 right-hand member with the articulated setting in shank plate dead lever 42 upper end, be located in the fuselage 15 the screw chamber 71 right side is provided with back belt chamber 39, the fixed back motor 36 that is provided with of screw chamber 71 right-hand member wall, back motor 36 power is provided with right extension to back motor shaft 37 in back belt chamber 39, back motor shaft 37 right-hand member is fixed and is provided with back motor belt 38, back belt chamber 39 with screw chamber 71 rotates between and is provided with the back screw shaft 56 that the intention is extended, back screw shaft 56 right-hand member fixed be provided with back motor 38 uses back belt 55 to connect between back motor shaft 38 Back belt pulley 54, back screw shaft 56 is located screw cavity 71 internal fixation is provided with back screw rod 35, back screw rod 35 go up the horizontal slip be provided with back screw rod 35 meshed screw cavity 71, the fixed back bracing piece 45 that is provided with downwardly extending of terminal wall under screw cavity 71, the articulated back connecting rod 29 that is provided with left extension of back bracing piece 45 lower extreme, back connecting rod 29 left end with the articulated setting of back dead lever 28 lower extreme.

Beneficially, the advancing device 300 includes advancing shafts 64 disposed between the gear cavity 65 and the front and rear end walls of the machine body 15 in a front-rear symmetric manner, the advancing shafts 64 are fixedly disposed with the advancing wheels 18 away from the symmetric center, the advancing shafts 64 are disposed in the gear cavity 65 and fixedly disposed with the advancing gears 61, a driven bevel gear shaft 21 extending through the bevel gear cavity 23 in a front-rear manner is disposed between the two gear cavities 65 in a rotating manner, the driven bevel gear shaft 21 is disposed in the bevel gear cavity 23 and fixedly disposed with the driven bevel gear 22 engaged with the driving bevel gear 20, the driven bevel gear shaft 21 is disposed in the gear cavity 65 and fixedly disposed with the driving gear 62, the sliding cavities 68 are slidably disposed in a front-rear manner and symmetrically disposed with the sliding blocks 67, the sliding blocks 67 are rotatably disposed with the sliding cavities 68 extending in a front-rear manner, and the sliding gears 63 engaged with the driving gear 62 and the advancing gears 61 are symmetrically disposed at two ends of the sliding cavities 68, the lower end wall of the sliding cavity 68 is fixedly provided with a sliding cylinder 69, the sliding cylinder 69 is in power connection with a sliding piston rod 70 towards the right, and the right end of the sliding piston rod 70 is fixedly connected with the rear end wall of the sliding block 67 at the front side.

The fixing and connecting method in this embodiment includes, but is not limited to, bolting, welding, and the like.

As shown in fig. 1-4, the sequence of mechanical actions of the whole device of the apparatus of the invention: when the ordinary sickbed is used, the working process is as follows: when the head needs to be raised, the control panel 72 is controlled to start the backrest motor 36 to rotate in the forward direction to drive the backrest motor belt 38 to rotate, so as to drive the backrest belt pulley 54 to rotate, so as to drive the backrest screw 35 to rotate, so as to drive the screw cavity 71 to move leftwards, so as to drive the backrest connecting rod 29 to push the backrest plate 48 and the headboard 49 to rotate clockwise around a hinge point with the seat board 40 to complete the back-raising action, and the backrest motor 36 is started to rotate reversely to reset.

The working process when needing to be used as a wheelchair: the control panel 72 is controlled to start the backrest motor 36 to rotate forward to drive the backrest plate 48 and the headboard 49 to rotate clockwise around the hinged point with the seat plate 40 to the end, and simultaneously the control panel 72 is controlled to start the leg motor 34 to rotate forward to drive the leg motor belt pulley 31 to rotate, thereby driving the leg belt pulley 51 to rotate, thereby driving the leg screw 57 to rotate, thereby driving the screw cavity 71 to move leftward to drive the shank plate connecting rod 43 to pull the shank plate 41 to rotate clockwise around the hinged point with the seat plate 40 to complete the leg lowering process, simultaneously the shank connecting rod 13 pulls the pedal connecting rod 12 to push the pedal plate 10 to complete the foot pedal lowering process, and after the above actions are completed, the sliding pin cylinder 60 is started to drive the sliding pin 59 to move away from the symmetry center to be disengaged from the sliding pin cavity 58, so as to fix the wheelchair module and the bed body, start the forward motor 17 to drive the forward motor shaft 19 to rotate, so as to drive the driving bevel gear 20 to rotate, so as to drive the driven bevel gear 22 to rotate, so as to drive the driving gear 62 to rotate, so as to drive the sliding gear 63 to rotate, so as to drive the forward gear 61 to drive the forward wheel 18 to rotate, so as to complete the forward movement of the wheelchair, when a right turn is required, the sliding cylinder 69 is controlled to drive the sliding piston rod 70 to move leftwards, so as to drive the sliding gear 63 to move leftwards to disengage from the forward gear 61 at the front side, so as to stop the forward wheel 18 at the front side to rotate, so as to complete the right turn, when a left turn is required, the sliding cylinder 69 is controlled to drive the sliding piston rod 70 to move rightwards, and after the use, the forward wheel 18, the, The leg motor 34 and the sliding pin cylinder 60 complete the resetting, and the using process of the nursing wheelchair bed can be completed by repeating the actions.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a nursing wheelchair bed can be dismantled to integration, includes the head of a bed body and is located the tailstock body that symmetry set up around the head of a bed body right side, its characterized in that: the bed tail body is fixedly connected with the bed head body through a bed body supporting frame, the bed head plate is rotatably arranged between the front end wall and the rear end wall of the bed body supporting frame, a machine body is arranged between the two bed body supporting frames in a left-right sliding mode, a left-right through opening and closing cavity is formed in the machine body, a seat plate is fixedly arranged on the upper end wall of the machine body, a backrest plate extending upwards is hinged to the left end wall of the seat plate, the backrest plate is connected with the bed head plate through a sliding pin device, a backrest fixing rod extending downwards is fixedly arranged on the left end wall of the backrest plate, a lower leg plate extending downwards is hinged to the right end of the seat plate, a pedal extending rightwards is hinged to the lower end of the lower leg plate, a pedal supporting rod extending leftwards is fixedly arranged on the left side of the lower end wall of the pedal plate, a lower leg connecting rod extending downwards, the lower end of the pedal connecting rod is hinged with the lower end of the pedal supporting rod, a lower leg plate fixing rod extending leftwards and upwards is fixedly arranged at the upper end of the lower leg connecting rod, an opening and closing mechanism for controlling the backrest plate, the lower leg plate and the pedal plate to rotate to open and close is arranged on the upper end wall of the opening and closing cavity, a bevel gear cavity is arranged below the opening and closing cavity in the machine body, storage batteries are symmetrically arranged on the left side and the right side of the bevel gear cavity in the machine body, a forward motor is fixedly arranged on the right end wall of the bevel gear cavity, the forward motor is connected with a forward motor shaft in a leftward power mode, a driving bevel gear is fixedly arranged on the left end of the forward motor shaft, gear cavities are symmetrically arranged in the machine body in the front and back mode relative to the forward motor, the gear cavities are communicated through sliding cavities, and the driving bevel gear can drive, the fixed head that charges that is provided with of fuselage left end wall, the fixed mouth that charges that is provided with of head right end wall with the head agrees with charges, the fixed power cord that is provided with of head left end wall, the fixed control panel that is provided with of head upper end wall.

2. The integrated detachable nursing wheelchair bed as recited in claim 1, wherein: the sliding pin device comprises sliding pin cavities, openings are symmetrically formed in the front end wall and the rear end wall of the backrest plate, the openings are far away from the symmetric center, a left backrest cavity and a right backrest cavity are communicated with each other, sliding pin cylinders are symmetrically and fixedly arranged in the front end wall and the rear end wall of the backrest cavity, and the sliding pins matched with the sliding pin cavities are arranged in the sliding pin cylinders towards the symmetric center in a power mode.

3. The integrated detachable nursing wheelchair bed as recited in claim 1, wherein: the opening and closing mechanism comprises a screw cavity which is communicated with the opening and closing cavity upwards, a leg belt cavity is arranged on the left side of the screw cavity in the machine body, a leg motor is fixedly arranged on the left end wall of the screw cavity, a leg motor shaft which extends into the leg belt cavity leftwards is dynamically arranged leftwards, a leg motor belt wheel is fixedly arranged on the left end of the leg motor shaft, leg screw shafts which extend leftwards and rightwards are symmetrically and rotationally arranged between the screw cavity and the leg belt cavity around the leg motor, a leg belt wheel is fixedly arranged on the left end of the leg screw shaft, the leg belt wheel is connected with the leg motor belt wheel through a leg belt, a leg screw rod is fixedly arranged in the screw cavity by the leg screw shaft, and leg thread blocks which are meshed with the leg screw rod are arranged on the leg screw rod in a left-right sliding manner, the lower end wall of the leg threaded block is fixedly provided with a control panel extending downwards, the lower end of the control panel is hinged with a lower leg plate connecting rod extending rightwards, the right end of the lower leg plate connecting rod is hinged with the upper end of a lower leg plate fixing rod, the right side of the screw cavity in the machine body is provided with a backrest belt cavity, the right end wall of the screw cavity is fixedly provided with a backrest motor, the backrest motor is powered rightwards and is provided with a backrest motor shaft extending rightwards into the backrest belt cavity, the right end of the backrest motor shaft is fixedly provided with a backrest motor belt, a backrest screw shaft which is required to extend is rotatably arranged between the backrest belt cavity and the screw cavity, the right end of the backrest screw shaft is fixedly provided with a backrest belt pulley connected with the backrest motor belt through a backrest belt, and the backrest screw shaft is positioned in the screw cavity and is fixedly provided with a backrest screw, the backrest screw rod is provided with a screw rod cavity meshed with the backrest screw rod in a left-right sliding mode, a backrest support rod extending downwards is fixedly arranged on the lower end wall of the screw rod cavity, the lower end of the backrest support rod is hinged to a backrest connecting rod extending leftwards, and the left end of the backrest connecting rod is hinged to the lower end of a backrest fixing rod.

4. The integrated detachable nursing wheelchair bed as recited in claim 1, wherein: the advancing device comprises advancing shafts which are symmetrically and rotationally arranged back and forth between the gear cavity and the front end wall and the rear end wall of the machine body, the advancing shafts are fixedly provided with advancing wheels far away from the symmetric center, the advancing shafts are fixedly provided with advancing gears in the gear cavities, driven bevel gear shafts which extend back and forth through the bevel gear cavities are rotationally arranged between the two gear cavities, the driven bevel gear shafts are fixedly provided with driven bevel gears which are meshed with the driving bevel gear in the bevel gear cavities, the driven bevel gear shafts are fixedly provided with driving gears in the gear cavities, sliding blocks which are symmetrically arranged back and forth are slidably arranged in the sliding cavities back and forth, sliding cavities which extend back and forth are rotationally arranged on the sliding blocks, sliding gears which are meshed with the driving gears and the advancing gears are symmetrically arranged at two ends of the sliding cavities, and sliding cylinders are fixedly arranged on the lower end wall of the sliding cavities, the right power of the sliding cylinder is connected with a sliding piston rod, and the right end of the sliding piston rod is fixedly connected with the front side of the rear end wall of the sliding block.