CN217286326U - Power-assisted stretcher vehicle - Google Patents

Abstract

The utility model discloses a power-assisted stretcher vehicle, which comprises a stretcher bed, a pair of X-shaped lifting arms arranged left and right and a crawler travelling mechanism, wherein the crawler travelling mechanism comprises crawler frames, crawler driving wheels and crawler load following wheels on two sides, the crawler frames on two sides are fixedly connected through main shafts arranged front and back, the end part of each main shaft is rotatably provided with the crawler driving wheel, a crawler is sleeved between the two crawler driving wheels on each side, the crawler frames are also rotatably provided with a plurality of crawler load following wheels which are in contact with the crawler, and the inner side of each crawler frame is fixedly provided with a bottom guide rail part; the lower ends of the two sides of the stretcher bed are fixedly provided with top guide rail parts; the X-shaped lifting arm comprises a pair of lifting arms which are arranged in a crossed mode. The utility model has the advantages of reasonable design, can be along the stair step toward swift current down, need not hard to lift up whole stretcher, operation convenient to use, labour saving and time saving can carry out the folding of stretcher, in convenient to accomodate the entering emergency tender, occupation space is little.

Description

Power-assisted stretcher vehicle

Technical Field

The invention relates to the technical field of stretchers, in particular to a power-assisted stretcher vehicle.

Background

The stretcher is a carrying apparatus which is usually used when a patient or an injured person cannot move freely, and is convenient for the patient and the injured person to lie down. Traditional stretcher structure is fairly simple, mainly lifts through the double and transports, but because the stretcher dead weight is heavier, in addition patient's weight need consume a large amount of physical power during the transport, so traditional stretcher only is applicable to the transport of level land short distance. When needing transport of longer distance, in order to carry the convenience, can adopt the stretcher to carry the patient usually, nevertheless to live when the patient of no elevator building needs stretcher transport, current stretcher can not be automatic downstairs, can't transport, can only adopt traditional stretcher manual handling. In recent years, with the improvement of living standard of people, the number of obese people is increased, and when obese patients need to be lifted to carry the patients to go downstairs, a large amount of manpower is consumed, but the personnel allocated in the ambulance are limited, so that the patients can be quickly carried downstairs, and the completion of the rescue personnel is difficult.

Some stretchers capable of automatically going upstairs and downstairs exist in the market at present, a traveling mechanism is driven by a motor to go upstairs and downstairs, but the self weights of the stretchers are about four or five hundred jin, first-aid workers cannot carry the stretchers upstairs and only can walk upstairs by themselves, and due to the fact that the speed of going upstairs is low, gold rescue time of patients is easily missed, and the requirements of daily use cannot be met.

Disclosure of Invention

The present invention aims to provide a power-assisted stretcher vehicle to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the power-assisted stretcher vehicle comprises a stretcher bed, a pair of X-shaped lifting arm assemblies arranged on the left and right sides and a crawler travelling mechanism, wherein the crawler travelling mechanism comprises crawler racks on two sides, crawler driving wheels and crawler load following wheels;

the lower ends of the two sides of the stretcher bed are fixedly provided with a first guide rail piece;

the X-shaped lifting arm assembly comprises a pair of lifting arms which are arranged in a crossed mode, the middle parts of the lifting arms which are arranged in the crossed mode are connected in a rotating fit mode through detachable pin shaft parts, the upper ends of the lifting arms which are parallel to the left and right sides are fixedly connected through upper stabilizer bars, the lower ends of the lifting arms which are parallel to the left and right sides are fixedly connected through lower stabilizer bars, the upper ends of the lifting arms are connected with the first guide rail part in a horizontal sliding fit mode through idler wheels which are installed in a rotating mode, and the end portions of the lower stabilizer bars are connected with the second guide rail part in a horizontal sliding fit mode through idler wheels which are installed in a rotating mode.

Preferably, the second guide rail part is provided with a bottom transverse guide rail groove matched with the roller, and the bottom transverse guide rail groove is provided with at least two bottom limiting grooves;

the first guide rail part is provided with a top transverse guide rail groove matched with the roller, and the top transverse guide rail groove is provided with at least two top limiting grooves.

Preferably, the number of the second guide rail parts is 4, and two ends of each second guide rail part are provided with bottom limiting grooves;

the number of the first guide rail parts is 4, top limiting grooves are formed in two ends of each first guide rail part, a working groove is formed in the middle of each first guide rail part, and a clamping groove is formed between the top limiting grooves on the outer sides and the working grooves;

and the bottom limiting groove at the outer side of the second guide rail part is correspondingly arranged right below the clamping groove on the first guide rail part.

Preferably, a roller limiting mechanism is installed on the first guide rail part corresponding to each top limiting groove, the roller limiting mechanism comprises a limiting hook and a limiting spring which are installed on the first guide rail part in a sliding mode from top to bottom, and a fixing pin fixed on the first guide rail part, one end of the limiting spring is connected with the fixing pin, and the other end of the limiting spring abuts against the limiting hook.

Preferably, the crawler frame comprises a frame seat plate and an outer stabilizing frame, the end part of the main shaft penetrates through the corresponding frame seat plate, a plurality of auxiliary shafts are fixedly mounted on the outer side of the frame seat plate, the crawler load follow-up wheel is rotatably mounted on the corresponding auxiliary shafts, and the outer stabilizing frame is fixedly connected with the end part of the main shaft and the end part of the auxiliary shaft.

Preferably, the crawler belt tensioning device comprises a tensioning seat plate fixed with the crawler belt frame, a tensioning rod and a tensioning wheel in abutting connection with the crawler belt, the tensioning wheel is rotatably arranged on a tensioning wheel shaft, and the tensioning rod is sleeved at the end part of the tensioning wheel shaft in a limiting manner;

vertical tensioning guide slot has been seted up to tensioning bedplate upper end, and tensioning shaft sliding fit is in vertical tensioning guide slot, fixedly connected with lock nut on the locking bedplate, the free end activity of tensioning rod passes the locking bedplate, and the free end of tensioning rod passes through the screw thread section and the cooperation of screwing of two lock nuts, and two lock nuts laminate respectively on the locking bedplate lateral wall from top to bottom.

Preferably, the support frame that sets up around still including, fixed mounting has a pair of support swing arm on the support frame, and the support swing arm is kept away from the one end of support frame and is rotated the suit on the main shaft, still overlaps on the main shaft and is equipped with the torsional spring, and the one end and the main shaft of torsional spring are fixed, and the other end and the support swing arm of torsional spring are fixed, the bottom of support frame still distributes and installs a plurality of universal ball.

Preferably, still include the locating lever, the suit is rotated on the main shaft to the one end of locating lever, and the other end of locating lever is provided with the circular arc cutting ferrule that is used for clamping on lower stabilizer bar.

Compared with the prior art, the invention has the beneficial effects that: the whole crawler belt travelling mechanism is reasonable in structural design, in the using process, a first-aid patient is bound on the stretcher bed, the crawler belt travelling mechanism can be contacted with a stair step, a rescuer can slide downwards along the stair step only by pulling the stretcher bed, the whole stretcher bed does not need to be lifted by strenuous force, the operation and the use are convenient, and time and labor are saved;

the X-shaped lifting arm assembly comprises a pair of lifting arms which are arranged in a crossed mode, when the stretcher is not used, the stretcher is folded by adjusting the positions of rollers at the end portions of the lifting arms in the top transverse guide rail groove and the bottom transverse guide rail groove, the stretcher is convenient to store and enter the ambulance, and the occupied space is small;

when the roller enters the corresponding top limiting groove, the limiting clamping hook is clamped into the wheel groove of the roller under the elastic force of the limiting spring to limit the transverse movement of the roller, so that the limiting effect is achieved, and when the roller is in contact limiting, the elastic force of the limiting spring can be overcome, the limiting clamping hook is pushed upwards, and the limiting can be relieved;

when the stretcher vehicle is in a high-position state, the positioning rod is rotated, so that the arc clamping sleeve is clamped on the lower stabilizing rod, the lower end of the X-shaped lifting arm assembly can be locked, and the use safety is ensured;

the tension degree of the crawler is conveniently adjusted by arranging the crawler tensioning mechanism; at stair corner, in order to turn to more nimble, can overcome the elasticity of torsional spring, step on the support frame for universal ball and ground contact, the track breaks away from with ground simultaneously, can realize turning to in a flexible way, transport convenient operation.

The folding stretcher cart has reasonable structural design, can slide downwards along the stair steps, does not need to difficultly lift the whole stretcher bed, is convenient to operate and use, saves time and labor, can be folded, is convenient to store and enter the emergency ambulance, and occupies small space.

Drawings

Fig. 1 is a schematic bottom perspective view of a power-assisted stretcher;

fig. 2 is a schematic top perspective view of the power-assisted stretcher;

fig. 3 is a side view of the power stretcher;

fig. 4 is an enlarged structural schematic diagram of a position A in the power-assisted stretcher vehicle;

fig. 5 is an enlarged schematic structural view of a position B in the power-assisted stretcher;

fig. 6 is a schematic structural view of a support frame in the power-assisted stretcher vehicle;

fig. 7 is a schematic side view of a first guide rail member and a second guide rail member of the power-assisted stretcher;

fig. 8 is a schematic structural view of the power-assisted stretcher in a folded state;

fig. 9 is a schematic structural view of the power-assisted stretcher in a horizontal offset state;

fig. 10 is a schematic structural view of the power-assisted stretcher in an inclined state.

In the figure: 1-stretcher, 11-longitudinal bottom plate, 2-first guide rail member, 21-top limit groove, 22-limit hook, 23-limit spring, 24-fixed pin, 25-limit spring, 26-limit hook, 3-X type lifting arm component, 31-lifting arm, 32-pin shaft component, 33-lower stabilizer bar, 34-upper stabilizer bar, 35-roller, 4-track running mechanism, 41-frame seat plate, 42-track driving wheel, 43-track, 44-external stabilizer, 45-track load follower wheel, 46-main shaft, 47-auxiliary shaft, 5-second guide rail member, 51-bottom limit groove, 6-support frame, 61-support swing arm, 62-middle rotating arm, 63-free arm, 64-universal ball, 7-positioning rod, 71-arc clamping sleeve, 8-track tensioning mechanism, 81-tensioning wheel, 82-tensioning seat plate, 83-locking seat plate, 84-tensioning rod, 85-vertical tensioning guide groove and 86-locking nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: referring to fig. 1 to 3, the power-assisted stretcher vehicle comprises a stretcher 1, a pair of X-shaped lifting arm assemblies 3 arranged left and right, and a crawler traveling mechanism 4, wherein the crawler traveling mechanism 4 comprises crawler frames on two sides, crawler driving wheels 42 and crawler load following wheels 45, the crawler frames on two sides are fixedly connected through a main shaft 46 arranged in front and back, the end of the main shaft 46 is rotatably provided with the crawler driving wheels 42, a crawler 43 is sleeved between the two crawler driving wheels 42 on each side, the crawler frames are also rotatably provided with a plurality of crawler load following wheels 45 in contact with the crawler 43, and the inner sides of the crawler frames are fixedly provided with guide rail members two 5;

the lower ends of the two sides of the stretcher bed 1 are fixedly provided with a first guide rail part 2; specifically, a plurality of longitudinal bottom plates 11 are fixed at the bottom of the stretcher 1, and a first guide rail member 2 is fixedly arranged on the lower surfaces of the longitudinal bottom plates 11.

The X-shaped lifting arm assembly 3 comprises a pair of lifting arms 31 which are arranged in a crossed mode, the middle parts of the lifting arms 31 which are arranged in the crossed mode are connected in a rotating fit mode through detachable pin shaft pieces 32, the upper ends of the lifting arms 31 which are parallel to the left and the right are fixedly connected through upper stabilizer bars 34, the lower ends of the lifting arms 31 which are parallel to the left and the right are fixedly connected through lower stabilizer bars 33, the upper ends of the lifting arms 31 are connected with a first guide rail piece 2 through idler wheels 35 which are installed in a rotating mode in a horizontal sliding fit mode, and the end portions of the lower stabilizer bars 33 are connected with a second guide rail piece 5 through idler wheels 35 which are installed in a rotating mode in a horizontal sliding fit mode.

Specifically, as shown in fig. 1 and 7, the number of the second rail members 5 is 4, and bottom limiting grooves 51 are formed at two ends of each second rail member 5; the number of the guide rail parts I2 is 4, top limiting grooves 21 are formed in two ends of each guide rail part I2, a working groove 22 is formed in the middle of each guide rail part I2, and a clamping groove 23 is formed between each top limiting groove 21 and the working groove 22 on the outer side of each guide rail part I2; when the rail member is installed, the bottom limiting groove 51 at the outer side of the second guide rail member 5 is correspondingly arranged right below the clamping groove 23 on the first guide rail member 2.

The working principle of the invention is as follows: in the initial state, the stretcher 1 and the crawler belt walking mechanism 4 are in the folded state (see fig. 8), the roller 35 at the end of the lower stabilizer bar 33 is positioned in the bottom limiting groove 51 at the outer side of the second rail member 5, and the roller 35 near the end of the upper stabilizer bar 34 is positioned in the clamping groove 23;

when the stretcher is used, the stretcher 1 is pulled upwards, so that the roller 35 at the end part of the lower stabilizing bar 33 is positioned in the bottom limiting groove 51 at the inner side of the second guide rail part 5, the roller 35 close to the end part of the upper stabilizing bar 34 is positioned in the working groove 22, and the stretcher is in a normal working state (see fig. 3).

When the stretcher vehicle goes down a staircase to a rest platform and needs to turn, the front and rear support frames 6 are stepped down, the universal balls 64 of the support frames are in contact with the ground, the crawler belt walking mechanism 4 is lifted, then the stretcher bed 1 is horizontally pulled, a group of rollers 35 close to the end part of the upper stabilizing rod 34 move into the clamping grooves 23 from the working grooves 22, so that the horizontal displacement of the stretcher bed 1 is adjusted (see figure 9), if the stretcher bed 1 cannot turn after being adjusted in horizontal displacement or is limited by the height of the stair railing, the pin shaft piece 32 can be pulled down, one end of the stretcher bed 1 needing to cross an obstacle is lifted, the stretcher bed 1 is in an inclined state (see figure 10), and the stretcher vehicle is moved left and right to conveniently pass through the stair rest platform. Obviously, in actual use, the stretcher 1 is inclined, so that the stretcher 1 should be provided with a safety binding belt, and the patient should be bound and positioned by the safety binding belt to prevent the patient from sliding down.

Whole track running gear 4's structural design is reasonable, and in the use, the first aid patient binds at stretcher 1, and track running gear 4 can contact with the stair step, and the rescue personnel only need stimulate stretcher 1, can down walk along the stair step, need not hard to lift up whole stretcher, operation convenient to use, labour saving and time saving.

As a further scheme, a roller limiting mechanism is installed on the first guide rail part 2 corresponding to each top limiting groove 21, the roller limiting mechanism comprises a limiting hook 26 and a limiting spring 25 which are vertically slidably installed on the first guide rail part 2, and a fixing pin 24 fixed on the first guide rail part 2, one end of the limiting spring 25 is connected with the fixing pin 24, and the other end of the limiting spring 25 abuts against the limiting hook 26. When the roller wheel enters the corresponding top limiting groove 21, the limiting hook 26 is clamped into the wheel groove of the roller wheel under the elastic force action of the limiting spring 25 to limit the transverse movement of the roller wheel, so that the limiting effect is achieved, and when the roller wheel is in contact limiting, the elastic force of the limiting spring 25 can be overcome, the limiting hook 26 is pushed upwards, and the limiting effect can be relieved.

In this embodiment, the track frame includes a frame base plate 41 and an outer stabilizer 44, the end of the main shaft 46 passes through the corresponding frame base plate 41, a plurality of auxiliary shafts are fixedly mounted on the outer side of the frame base plate 41, the track load following wheels 45 are rotatably mounted on the corresponding auxiliary shafts 47, and the outer stabilizer 44 is fixedly connected with the end of the main shaft 46 and the end of the auxiliary shafts 47. The crawler frame is reasonable in structural design, the end of the main shaft 46 and the end of the auxiliary shaft 47 can be fixed and limited through the outer stabilizer 44, and stable operation of the crawler driving wheels 42 and the crawler load follow-up wheels 45 is guaranteed.

The fixing device further comprises a positioning rod 7, one end of the positioning rod 7 is rotatably sleeved on the main shaft 46, and an arc clamping sleeve 71 used for being clamped on the lower stabilizing rod 33 is arranged at the other end of the positioning rod 7. When the stretcher vehicle is in a high-position state, the positioning rod 7 is rotated, so that the arc clamping sleeve 71 is clamped on the lower stabilizing rod 33, the lower end of the X-shaped lifting arm assembly 3 can be locked, and the use safety is ensured.

Example 2: referring to fig. 6, the power-assisted stretcher vehicle is different from embodiment 1 in that the power-assisted stretcher vehicle further includes a track tensioning mechanism 8, the track tensioning mechanism 8 includes a tensioning seat plate 82 fixed to the track frame, a tensioning rod 84 and a tensioning wheel 81 for abutting against and connecting with the track 43, the tensioning wheel 81 is rotatably mounted on a tensioning wheel shaft, and the end of the tensioning wheel shaft is limited by the tensioning rod 84;

the upper end of the tensioning seat plate 82 is provided with a vertical tensioning guide groove 85, a tensioning wheel shaft is in sliding fit in the vertical tensioning guide groove 85, the outer side wall of the tensioning seat plate 82 is further fixedly connected with a locking seat plate 83, the free end of the tensioning rod 84 movably penetrates through the locking seat plate 83, the free end of the tensioning rod 84 is in tight fit with two locking nuts 86 through a threaded section, and the two locking nuts 86 are respectively attached to the upper side wall and the lower side wall of the locking seat plate 83.

When the tensioning seat plate 82 and the tensioning rod 84 are installed, two groups of tensioning seat plates 82 and two groups of tensioning rods 84 are arranged and are respectively positioned at two ends of the tensioning wheel 81, when the tensioning wheel 81 is required to rise to tightly abut against the crawler belt 43, the lower locking nut 86 is firstly rotated to enable the lower locking nut 86 to be separated from the locking seat plate 83 by a certain distance, then the upper locking nut 86 is screwed until the two locking nuts 86 are attached to the locking seat plate 83, and the adjustment and the fixation are completed; through the setting of track straining device 8, conveniently adjust the rate of tension of track 43.

Of course, similar structures of other track tensioning mechanisms can be adopted, as shown in fig. 5, only one group of tensioning seat plate 82 and tensioning rod 84 is arranged and located at the outer side, the lower end of the tensioning seat plate 82 is welded and fixed with the outer stabilizing frame 44 of the track frame, the frame seat plate 41 is provided with a plurality of tensioning shaft holes in the height direction in a distributed manner, during specific installation, one end of a tensioning wheel shaft can be inserted into the tensioning shaft hole with a proper height, then the tensioning rod 84 is sleeved at the other end of the tensioning wheel shaft, and finally, two locking nuts 86 are screwed for locking.

Example 3: referring to fig. 1, 3 and 6, the power-assisted stretcher vehicle is different from embodiment 2 in that the power-assisted stretcher vehicle further includes a support frame 6 disposed in front and rear, a pair of support swing arms 61 is fixedly mounted on the support frame 6, one end of each support swing arm 61, which is far away from the support frame 6, is rotatably sleeved on the main shaft 46, a torsion spring is further sleeved on the main shaft 46, one end of the torsion spring is fixed to the main shaft 46, the other end of the torsion spring is fixed to the support swing arm 61, and a plurality of universal balls 64 are further distributed and mounted at the bottom of the support frame 6.

Although the crawler traveling mechanism 4 can steer, the steering is not flexible enough, so that at the corner of the stairs, in order to steer more flexibly, the power-assisted stretcher can be lifted, the elastic force of the torsion spring is overcome, the support frame 6 is stepped on, the universal ball 64 is in contact with the ground, meanwhile, the crawler 43 is separated from the ground, the flexible steering can be realized, when the flexible steering is not needed, the power-assisted stretcher can be lifted, the free arm 63 is stepped on, and the support frame 6 can be reset under the elastic action of the torsion spring.

In the present embodiment, the universal ball 64 specifically includes a ball cylinder fixed to the lower end of the support frame 6, and a ball is fitted into the lower end of the ball cylinder. Obviously, the ball bearings 64 of the present embodiment may be replaced with a universal roller.

In this embodiment, the supporting frame 6 is a triangular frame, a middle rotating arm 62 is further fixed on the supporting frame 6, the middle rotating arm 62 is also rotatably sleeved on the main shaft 46, and a free arm 63 extends from the middle rotating arm 62, so that the supporting frame 6 can be driven to rotate by stepping on or pulling the free arm 63. The support frame 6 has reasonable structural design, and when the support frame 6 is in a horizontal state, the universal balls 64 at three corners of the support frame 6 are in contact with the ground and are matched with the middle rotating arm 62 and the support swing arm 61, so that the whole crawler travel mechanism 4 can be stably supported.

In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.

Claims (8)

1. Helping hand stretcher, its characterized in that: the stretcher comprises a stretcher bed (1), a pair of X-shaped lifting arm assemblies (3) arranged left and right and a crawler travelling mechanism (4), wherein the crawler travelling mechanism (4) comprises crawler racks on two sides, crawler driving wheels (42) and crawler load following wheels (45), the crawler racks on the two sides are fixedly connected through main shafts (46) arranged front and back, the end parts of the main shafts (46) are rotatably provided with the crawler driving wheels (42), a crawler (43) is sleeved and connected between the two crawler driving wheels (42) on each side, the crawler racks are also rotatably provided with a plurality of crawler load following wheels (45) which are in contact with the crawler (43), and the inner sides of the crawler racks are fixedly provided with guide rail pieces II (5);

the lower ends of the two sides of the stretcher (1) are fixedly provided with a first guide rail piece (2);

x type lift arm subassembly (3) are including a pair of alternately arranged lift arm (31), alternately arranged lift arm (31) middle part is connected through detachable round pin axle spare (32) normal running fit, lift arm (31) upper end of controlling the parallel is through last stabilizer bar (34) fixed connection, lift arm (31) lower extreme of controlling the parallel is through stabilizer bar (33) fixed connection down, the upper end of lift arm (31) is connected with guide rail spare one (2) horizontal sliding fit through gyro wheel (35) of rotation installation, the tip of lower stabilizer bar (33) is connected with guide rail spare two (5) horizontal sliding fit through gyro wheel (35) of rotation installation.

2. A powered stretcher as claimed in claim 1 wherein: a bottom transverse guide rail groove matched with the roller (35) is formed in the second guide rail part (5), and at least two bottom limiting grooves (51) are formed in the bottom transverse guide rail groove;

the first guide rail part (2) is provided with a top transverse guide rail groove matched with the roller, and the top transverse guide rail groove is provided with at least two top limiting grooves (21).

3. A powered stretcher as claimed in claim 1 wherein: the number of the second guide rail parts (5) is 4, and two ends of each second guide rail part (5) are provided with bottom limiting grooves (51);

the number of the first guide rail parts (2) is 4, top limiting grooves (21) are formed in two ends of each first guide rail part (2), a working groove (22) is formed in the middle of each first guide rail part (2), and a clamping groove (23) is formed between the top limiting groove (21) and the working groove (22) on the outer side;

and a bottom limiting groove (51) at the outer side of the second guide rail part (5) is correspondingly arranged right below the clamping groove (23) of the first guide rail part (2).

4. A powered stretcher as claimed in claim 2 wherein: the utility model discloses a guide rail spare is including guide rail spare (2) is gone up and is corresponded every top spacing groove (21) and all install gyro wheel stop gear, gyro wheel stop gear include about the slidable mounting spacing pothook (26) on guide rail spare (2), spacing spring (25) and fix fixed pin (24) on guide rail spare (2), the one end and the fixed pin (24) of spacing spring (25) are connected, the other end of spacing spring (25) is contradicted on spacing pothook (26).

5. A power assisted stretcher as claimed in claim 1, wherein: the crawler frame comprises a frame base plate (41) and an outer stabilizing frame (44), the end part of a main shaft (46) penetrates through the corresponding frame base plate (41), a plurality of auxiliary shafts are fixedly mounted on the outer side of the frame base plate (41), a crawler load following wheel (45) is rotatably mounted on the corresponding auxiliary shafts, and the outer stabilizing frame (44) is fixedly connected with the end part of the main shaft (46) and the end part of the auxiliary shaft.

6. A powered stretcher as claimed in claim 1 wherein: the crawler tensioning mechanism (8) comprises a tensioning seat plate (82) fixed with the crawler frame, a tensioning rod (84) and a tensioning wheel (81) in abutting connection with the crawler (43), the tensioning wheel (81) is rotatably mounted on a tensioning wheel shaft, and the tensioning rod (84) is sleeved at the end part of the tensioning wheel shaft in a limiting manner;

vertical tensioning guide slot (85) have been seted up to tensioning bedplate (82) upper end, and tensioning wheel axle sliding fit is in vertical tensioning guide slot (85), and still fixedly connected with locking bedplate (83) on tensioning bedplate (82) lateral wall, locking bedplate (83) are passed in the free end activity of tensioning rod (84), and the free end of tensioning rod (84) passes through the screw thread section and screws the cooperation with two lock nut (86), and lateral wall about locking bedplate (83) are laminated respectively in two lock nut (86).

7. A powered stretcher as claimed in claim 1 wherein: the support frame (6) that still sets up around including, fixed mounting has a pair of support swing arm (61) on support frame (6), and the one end rotation suit that support frame (6) were kept away from in support swing arm (61) is on main shaft (46), still overlaps on main shaft (46) and is equipped with the torsional spring, and the one end and main shaft (46) of torsional spring are fixed, and the other end and support swing arm (61) of torsional spring are fixed, the bottom of support frame (6) still distributes and installs a plurality of universal ball (64).

8. A powered stretcher as claimed in claim 1 wherein: the fixing device also comprises a positioning rod (7), one end of the positioning rod (7) is rotatably sleeved on the main shaft (46), and the other end of the positioning rod (7) is provided with an arc clamping sleeve (71) which is clamped on the lower stabilizing rod (33).

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