CN110368229B

CN110368229B - Shifting vehicle

Info

Publication number: CN110368229B
Application number: CN201910575722.2A
Authority: CN
Inventors: 李路平; 杨茗予; 陆柯军; 覃鸿
Original assignee: Ningbo Kangmailong Medical Apparatus Co Ltd
Current assignee: Ningbo Kangmailong Medical Apparatus Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2024-05-07
Anticipated expiration: 2039-06-28
Also published as: WO2020258435A1; CN110368229A

Abstract

The invention relates to a shifting vehicle, belongs to the field of shifting vehicles, and solves the problem that an object to be used needs to be shifted to the shifting vehicle by means of external force to cause troublesome overall operation; the left mechanical arm and the right mechanical arm lift and put down a human body under the driving force of the lifting upright post; according to the shifting vehicle, the left mechanical arm and the right mechanical arm are lifted and put down by virtue of the driving force of the lifting upright post, and the left mechanical arm and the right mechanical arm act on the armpits of the human body and play a supporting role, so that the shifting vehicle imitates the actions of holding the old or children by both hands, accords with the characteristics of the stress position of the human body, does not cause harm or discomfort to the old or the patient, and has the advantages of simpler and faster operation, saving labor time and labor force and meeting the users who need to finish shifting in a short time compared with the traditional binding type shifting vehicle and hanging bracket.

Description

Shifting vehicle

Technical Field

The present invention relates to a shift vehicle.

Background

Along with social development and technological progress, the medical field is more and more emphasized, so that research in the field of medical equipment is deeper, under the current medical environment, a considerable part of use objects which are difficult to self-care and move daily due to inconvenience of lower limbs exist, such use objects usually need nursing staff to assist, and the physique of the staff needing to be nursing is very weak, and the physical strength of the nursing staff is limited, so that the nursing staff needed to be held or lifted by the nursing staff is unstable, and potential safety hazards are caused.

Therefore, the importance of medical equipment in the field is more important, in view of the poor mobility of a used object, the common mobile trolley equipment cannot meet the requirement, especially the problem that the used object is uncomfortable or topples left and right easily occurs in the process of carrying and fixing the used object on a shifting trolley, when the user is in a holding process, if the user is hard improperly, some user is hard to protect, the accident often causes great secondary injury to the used object, the occurrence of medical contradiction is aggravated, in addition, the common shifting trolley adopts a binding type fixing mode to fix the used object on the shifting trolley, and the problems of mental unsafe and even panic caused by shaking left and right, complex wearing and even secondary injury caused by improper use can be solved.

Disclosure of Invention

The invention aims to provide a shifting vehicle, which solves the technical problems that the whole operation is troublesome and secondary damage is brought to a used object because the used object is shifted to the shifting vehicle by external force in the prior art.

In order to solve the technical problems, the invention is realized by the following technical scheme that the shifting vehicle comprises a vehicle base and a lifting upright post arranged on the vehicle base; the left mechanical arm and the right mechanical arm are arranged on the lifting upright post, and a holding force for holding the human trunk is formed between the left mechanical arm and the right mechanical arm; the hip support body is arranged below the left mechanical arm and the right mechanical arm and used for supporting the buttocks of a human body; the left mechanical arm and the right mechanical arm lift and put down a human body under the driving force action of the lifting upright post.

The beneficial effects of the invention are as follows:

According to the shifting vehicle, the left mechanical arm and the right mechanical arm are lifted and put down by virtue of the driving force of the lifting upright post, and the left mechanical arm and the right mechanical arm act on the armpits of the human body and play a supporting role, so that the shifting vehicle imitates the actions of holding the old or children by both hands, accords with the characteristics of the stress position of the human body, does not cause harm or discomfort to the old or the patient, and has the advantages of simpler and faster operation, saving labor time and labor force and meeting the users who need to finish shifting in a short time compared with the traditional binding type shifting vehicle and hanging frame;

Secondly, the left mechanical arm and the right mechanical arm are respectively used for supporting the two armpits of the human body, so that the left and right directions of the human body can be just fixed, and the object to be used can be prevented from toppling and shaking in the left and right directions, and the safety performance of the human body in the lifting and putting down process is improved;

then, a buttock support body is arranged below the left mechanical arm and the right mechanical arm and is mainly used for supporting buttocks of a human body, and a user can sit on the buttock support body, so that the user is supported in the vertical direction, and the stability is improved;

Finally, the lifting upright post can adjust the heights of the left mechanical arm and the right mechanical arm according to different human bodies, so that the requirements of different human bodies are met, and the practicability is good;

Therefore, according to the technical scheme of the invention, the left mechanical arm and the right mechanical arm are used for lifting and putting down the human body by virtue of the driving force of the lifting upright post, and the left mechanical arm and the right mechanical arm are used for supporting two armpits of the human body, so that safe, efficient and comfortable transfer of a used object to the shifting vehicle is realized, the force of a worker is not required for protecting the worker, the process of transferring the used object to the shifting vehicle is greatly simplified, the secondary injury brought in the transfer process is reduced, and even the accident rate in the shifting process of the used object can be reduced.

Preferably, the lifting upright post is provided with two rotating shafts, the left mechanical arm and the right mechanical arm are respectively arranged around the two rotating shafts in a rotating way, the included angle between the rotating shafts and the horizontal plane is alpha, 0< alpha <90 degrees, and the left mechanical arm and the right mechanical arm generate a movement trend of rotating towards the human body trunk under the action of gravity.

Preferably, the rotating shaft is provided with an end plate, the end plate is axially inclined relative to the rotating shaft, an axial included angle between the end plate and the rotating shaft is beta, 0 degrees < beta <45 degrees, the end plate is provided with a rotating hole, the axial distance between the rotating hole and the rotating shaft is d,30mm < d <60mm, a connecting rod is connected between the two end plates, and the end part of the connecting rod is rotationally arranged at the rotating hole.

Preferably, a gear piece is arranged between the inner sides of the left mechanical arm and the right mechanical arm, and the gear piece is used for limiting the closing angle between the two mechanical arms.

Preferably, the gear is a spring or an electric push rod or a cylinder.

Preferably, the left mechanical arm and the right mechanical arm are connected through an arm driving device, the arm driving device comprises a first tooth and a second tooth, the two rotating shafts are a left rotating shaft and a right rotating shaft respectively, the first tooth and the second tooth are linked, the first tooth drives the left mechanical arm through the left rotating shaft, the second tooth drives the right mechanical arm through the right rotating shaft, the first tooth or the second tooth rotates to control the left mechanical arm and the right mechanical arm to synchronously close or separate, the angular speeds of the left mechanical arm and the right mechanical arm are the same, and the left mechanical arm and the right mechanical arm are symmetrically arranged along a vertical plane.

Preferably, the first gear comprises a first gear and a second gear which are coaxially fixed, the second gear comprises a third gear and a fourth gear which are coaxially fixed, the first gear is meshed with the third gear, a fifth gear is fixed on the left rotating shaft, a sixth gear is fixed on the right rotating shaft, the second gear is meshed with the fifth gear, and the fourth gear is meshed with the sixth gear.

Preferably, the left mechanical arm and the right mechanical arm are respectively provided with a supporting pad simulating the shape of a human hand.

Preferably, the hip support body comprises a bracket and a hip support plate, the bracket is arranged on the vehicle base, the bracket is rotationally connected with the hip support plate, a linear driver is arranged on the hip support plate, a connecting rod assembly is further arranged between the bracket and the hip support plate, one end of the connecting rod assembly is rotationally connected with the bracket, the other end of the connecting rod assembly is rotationally connected with the linear driver, the hip support mechanism further comprises a locking piece for locking the connecting rod assembly, when the locking piece is in a locking state, the linear driver drives the hip support plate to rotate relative to the bracket, and when the locking piece is in an unlocking state, the hip support plate can manually rotate relative to the bracket.

Preferably, the connecting rod assembly comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is rotationally connected with the linear driver, the other end of the first connecting rod is rotationally connected with the second connecting rod, one end of the second connecting rod, far away from the first connecting rod, is rotationally connected with the bracket, when the locking piece is in a locking state, the second connecting rod is non-rotatable relative to the bracket, the linear driver drives the hip support plate to rotate relative to the bracket, and when the locking piece is in an unlocking state, the second connecting rod is rotatable relative to the bracket, and the hip support plate is manually rotatable relative to the bracket.

Preferably, the second connecting rod comprises a sleeve, a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are arranged on the side wall of the sleeve and are arranged on the same side, a clamp spring pin is rotationally connected between the ends of the first connecting plate and the second connecting plate far away from the sleeve, one end of the first connecting rod far away from the linear driver is rotationally arranged on the clamp spring pin, a connecting shaft is connected between the hip supporting plate and the bracket, and the sleeve is rotationally arranged on the connecting shaft; the first connecting rod is arranged between the first connecting plate and the second connecting plate, and a limiting shaft sleeve for limiting the sliding of the first connecting rod is arranged on the clamp spring pin.

Preferably, the locking piece comprises a locking bolt and a pull ring, and the second connecting rod and the bracket are respectively provided with a positioning hole for the locking bolt to move.

Preferably, the hip support plate and the opposite end of the bracket are provided with locking teeth.

Preferably, the hip support body comprises two hip support plates, the two hip support plates are symmetrically arranged about the horizontal axis of the bracket, and an arc-shaped notch is arranged between the two hip support plates.

Preferably, the lifting stand column comprises an inner pipe, an electric push rod arranged at the bottom of the inner side of the inner pipe, and an outer pipe which is driven by the electric push rod to stretch out and draw back along the outer side of the inner pipe, the electric push rod is provided with a safety release device, the safety release device is provided with a safety release switch, the shift vehicle further comprises a safety release connecting rod assembly for pressing the safety release switch, and the vehicle base is provided with a safety release button for driving the safety release connecting rod assembly to act.

Preferably, the safety release device is located the inner side of inner tube bottom and the safety release switch extends to safety release device below, the safety release link assembly includes horizontal migration connecting rod and rotation connecting rod, horizontal migration connecting rod horizontal swing joint is on shifting the car base, safety release button is connected to the one end of horizontal migration connecting rod, and rotation connecting rod is connected to other one end, and safety release button is located shifting car base side, the rotation connecting rod is equipped with the roof that upwards promotes safety release switch, safety release button is connected with reset spring.

Preferably, the rotating connecting rod comprises a vertical section and a horizontal section which are connected into a V shape, the bottom of the vertical section is hinged with the horizontal moving connecting rod, the connecting part of the vertical section and the horizontal section is rotationally connected with the rotating shaft, and the top plate is arranged on the horizontal section.

Preferably, the lifting upright is arranged in a backward inclined mode, the guide rail comprises a guide rail strip connected with the outer pipe and a guide rail sliding block connected with the inner pipe, the guide rail sliding block is provided with a guide rail groove in sliding fit with the guide rail strip, the length of the guide rail sliding block is larger than one third of the length of the inner pipe, and at least one fifth of the length of the inner pipe is kept in fit with the guide rail strip when the outer pipe extends outwards to a limit position.

Preferably, the horizontal projection of the lifting upright post is in a shape with a front narrow, a rear wide and a width gradually changed, and two groups of guide rails are arranged on the left side and the right side of the rear part of the lifting upright post side by side.

Preferably, the lower front side inner wall of the outer tube is connected with a backing plate supported on the outer wall of the inner tube, or/and the upper front side outer wall of the inner tube is connected with a backing plate supported on the inner wall of the outer tube.

Preferably, a self-lubricating nylon bushing is arranged in the guide rail groove.

Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.

Drawings

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

Fig. 2 is a schematic front view of a left mechanical arm and a right mechanical arm according to a first embodiment of the present invention;

fig. 3 is a schematic perspective view of a left mechanical arm and a right mechanical arm according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating a front view of a spindle according to an embodiment of the present invention;

FIG. 5 is a schematic bottom view of a shaft according to an embodiment of the invention;

FIG. 6 is a schematic view of an arm support according to the present invention;

FIG. 7 is an enlarged partial schematic view of F in FIG. 6;

FIG. 8a is a schematic view showing the structure of the arm support body of the present invention when the hip support plate is closed in a locked state of the locking member;

FIG. 8b is a cross-sectional view of the G-G plane of FIG. 8 a;

FIG. 9 is a schematic view showing a partial structure of a bracket in an arm support according to the present invention;

FIG. 10 is a schematic view of the structure of the second link in the arm support according to the present invention;

FIG. 11a is a schematic view showing the structure of the arm support body according to the present invention when the hip support plate is opened in a locked state of the locking member;

FIG. 11b is a cross-sectional view taken along the C-C plane in FIG. 11 a;

FIG. 12a is a schematic view showing the structure of the arm support body of the present invention when the hip support plate is closed in the unlocked state of the locking member;

FIG. 12b is a cross-sectional view taken along the D-D plane in FIG. 12 a;

FIG. 13a is a schematic view showing the structure of the arm support body according to the present invention when the hip support plate is opened in the unlocked state of the locking member;

FIG. 13b is a cross-sectional view taken along the E-E plane in FIG. 13 a;

FIG. 14 is a front view of the shift cart;

FIG. 15 is a schematic view of the cross-sectional structure A-A of FIG. 14;

FIG. 16 is an enlarged schematic view of the structure shown at I in FIG. 15;

FIG. 17 is a side view of the shift cart;

FIG. 18 is a schematic view of the cross-sectional structure B-B in FIG. 17;

FIG. 19 is a schematic view of a portion of the first embodiment of FIG. 18;

FIG. 20 is a schematic diagram of a portion II of the structure of FIG. 18;

FIG. 21 is a schematic view of a first configuration of a usage status of a usage object according to a first embodiment of the present invention;

FIG. 22 is a second schematic diagram illustrating a usage status of a usage object according to the first embodiment of the present invention;

FIG. 23 is a third schematic diagram illustrating a usage status of a usage object according to the first embodiment of the present invention;

FIG. 24 is a schematic perspective view of a shift cart according to a second embodiment of the present invention;

FIG. 25 is an exploded view of a left mechanical arm and a right mechanical arm in a third embodiment of the present invention;

FIG. 26 is an enlarged schematic view of the structure shown at X in FIG. 25;

Fig. 27 is a schematic perspective view of a left mechanical arm and a right mechanical arm in a fourth embodiment of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.

In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Embodiment one:

referring to fig. 1, in this embodiment, a shift vehicle includes a vehicle base C, on which four pulleys C1 are provided, on which a pedal area is provided, on which a lifting column D is provided, and a left mechanical arm A1 and a right mechanical arm A2 mounted on the lifting column D for lifting the armpits of a human body are respectively mounted, and the left mechanical arm A1 and the right mechanical arm A2 hug the trunk of the human body; the hip support body B is arranged below the left mechanical arm A1 and the right mechanical arm A2 and used for supporting the buttocks of a human body; the left mechanical arm A1 and the right mechanical arm A2 lift and put down a human body under the action of the driving force of the lifting upright post.

The shifting cart in the embodiment enables the left mechanical arm A1 and the right mechanical arm A2 to lift and put down a human body by virtue of the driving force of the lifting upright post D, and as the left mechanical arm A1 and the right mechanical arm A2 respectively act on the armpits of the human body and play a supporting role, the shifting cart simulates the actions of holding the old or the child by both hands, accords with the characteristics of the stress position of the human body, does not harm or cause discomfort to the old or the patient, and is simpler and faster to operate, saves labor protection time and labor force and can more meet users who need to finish shifting in a short time compared with the traditional binding type shifting cart and hanging frame;

Secondly, as the left mechanical arm A1 and the right mechanical arm A2 are respectively used for supporting the two armpits of the human body, the left mechanical arm A1 and the right mechanical arm A2 just can fix the left and right directions of the human body, so that the object to be used can be prevented from toppling and shaking in the left and right directions, and the safety performance of the human body in the lifting and putting down process is improved;

then, the buttocks support body B is arranged, and is mainly used for supporting buttocks of a human body, and a user can sit on the buttocks support body, so that the buttocks support body B is supported in the vertical direction, and the stability is improved;

finally, the lifting upright post D can adjust the height of the supporting pad body according to different human bodies, thereby meeting the requirements of different human bodies, and having good practicality;

therefore, according to the technical scheme of the whole invention, the left mechanical arm A1 and the right mechanical arm A2 are used for lifting and putting down a human body by virtue of the driving force of the lifting upright post D, and the left mechanical arm A1 and the right mechanical arm A2 are used for supporting two armpits of the human body, so that safe, efficient and comfortable transfer of a used object to a shift vehicle is realized, force is not required for protecting workers, the process of transferring the used object to the shift vehicle is greatly simplified, secondary injury brought in the transfer process is reduced, and even the accident rate in the shifting process of the used object can be reduced.

Specifically, referring to fig. 1 to 5, the left mechanical arm A1 is lifted at the left armpit of the human body, the right mechanical arm A2 is lifted at the right armpit of the human body, the left mechanical arm A1 and the right mechanical arm A2 simulate the hands of a person to lift the upper body of the person with mobility impairment, meanwhile, the left mechanical arm A1 and the right mechanical arm A2 are respectively held tightly from the left side and the right side of the trunk part of the person with mobility impairment, the upper trunk is prevented from shaking in the underpit supporting process, in addition, a supporting pad A5 simulating the shape of a human hand is arranged on the left mechanical arm A1 and the right mechanical arm A2, the supporting and holding effects are achieved simultaneously through the supporting pad A5, and in addition, the supporting pad A5 can be rotationally connected with the mechanical arm, so that the trunk of the supporting pad A5 is attached to the armpit and the skin of the person with mobility impairment can be realized, and the comfort of the lifted person can be improved.

In order to reduce the irritation of the pad body A5 to the underarm skin and reduce the probability of damaging the underarm skin, the pad body A5 may be made of a flexible material such as silica gel, and a metal reinforcing plate matched with the pad body A5 in shape may be installed in the pad body A5 to improve the mechanical strength of the pad body A5.

Two rotating shafts are arranged on the frame, and the two rotating shafts are a left rotating shaft A3 and a right rotating shaft A4 respectively. The left rotating shaft A3 and the right rotating shaft A4 are simultaneously installed on the frame, the left mechanical arm A1 is rotatably installed on the left rotating shaft A3, the right mechanical arm A2 is installed on the right rotating shaft A4, and the left mechanical arm A1 and the right mechanical arm A2 are respectively supported through the left rotating shaft A3 and the right rotating shaft A4.

In this embodiment, the left rotating shaft A3 and the right rotating shaft A4 are identical, and the left mechanical arm A1 and the right mechanical arm A2 are identical. A vertical plane is selected, and the left rotating shaft A3 and the right rotating shaft A4 are symmetrically arranged along the vertical plane.

Taking the left rotating shaft A3 as an example, the left rotating shaft A3 is arranged at the left side of the vertical plane, the included angle between the left rotating shaft A3 and the horizontal plane is alpha, 0< alpha <90 degrees, that is, the left rotating shaft A3 is neither arranged horizontally nor vertically, and the rotating plane where the corresponding left mechanical arm A1 is located is a non-horizontal plane or a non-vertical plane. Therefore, after the left armpit is extruded on the supporting pad A5 on the left mechanical arm A1, the left mechanical arm A1 rotates towards the lowest point of the vertical height in the rotating plane under the dual actions of self gravity and human gravity, and only the lowest point is required to be arranged in the middle of the human body trunk, so that the rotating process of the left mechanical arm A1 from the highest point to the lowest point in the rotating plane is equivalent to the rotating process of the left mechanical arm A1 towards the trunk, meanwhile, the left mechanical arm A1 contacts with the human body trunk before rotating to the lowest point, the rotation of the left mechanical arm A1 is stopped by the blocking of the human body trunk, but the moving trend towards the middle of the human body trunk is still reserved, and under the condition that the human body weight is larger, the moving trend is stronger, the holding force between the corresponding left mechanical arm A1 and the trunk is larger.

The working principle of the right mechanical arm A2 and the right rotating shaft A4 is the same. The rotation of the left and right arms A1 and A2 both involve a movement horizontally approaching the torso from a position away from the torso.

Before the left mechanical arm A1 and the right mechanical arm A2 rotate to hold the trunk, the symmetrical vertical plane between the left rotating shaft A3 and the right rotating shaft A4 can be adjusted to coincide with the central axis of the trunk, the corresponding left mechanical arm A1 and the right mechanical arm A2 can hold the trunk from the left side and the right side of the trunk respectively, on one hand, the comfort level of a human body is better, and on the other hand, the holding effect on the trunk is better.

In the above-mentioned enclasping process, in order to ensure that the enclasping position of the trunk is bilaterally symmetrical, the trunk is prevented from tilting, and in this embodiment, the left mechanical arm A1 and the right mechanical arm A2 are symmetrically arranged as well, and the symmetry plane is also the symmetry plane between the left rotating shaft A3 and the right rotating shaft A4. In order to ensure real-time symmetry of the left and right mechanical arms A1 and A2, the rotational speeds of the left and right mechanical arms A1 and A2 need to be kept consistent or approximately consistent, and thus a linkage relationship needs to exist between the left and right rotating shafts A3 and A4.

Taking the left rotating shaft A3 as an example, the left rotating shaft A3 is provided with an end plate A18, the end plate A18 is axially inclined relative to the left rotating shaft A3, the axial included angle between the end plate A18 and the rotating shaft is beta, 0 degrees < beta <45 degrees, the end plate A18 is provided with a rotating hole A19, and the distance between the axis of the rotating hole A19 and the axis of the rotating shaft is d,30mm < d <60mm. At this time, a connecting rod a17 is connected between the end plate a18 of the left rotating shaft A3 and the end plate a18 with the rotating shaft, and two ends of the connecting rod a17 are respectively rotatably arranged at two rotating holes a 19.

The angular velocities of the left and right rotational shafts A3 and A4 can still be kept equal or approximately equal at this time.

In addition, in this embodiment, the left mechanical arm and the right mechanical arm are controlled manually, so that the left mechanical arm and the right mechanical arm are prevented from being close to each other under the action of dead weight and collide with each other, a gear piece A20 is arranged between the inner sides of the left mechanical arm and the right mechanical arm, the gear piece A20 is used for limiting the closing angle between the two mechanical arms, the gear piece is a spring or an electric push rod or a gas spring, some fat people can realize larger clamping force, the closing angle between the mechanical arms is smaller, the trunk is pressed under the condition that the closing angle is too small, and the mechanical arms are limited through the gear piece so as to avoid excessive extrusion of the mechanical arms to the trunk. Meanwhile, after the trunk leaves the mechanical arm, the mechanical arm can slide, and then the mechanical arms are close to each other to generate impact, the gear piece effectively plays a limiting role on the closing angle between the two mechanical arms, the mechanical arm is prevented from being directly impacted, the service life of the mechanical arm is prolonged, the left mechanical arm and the right mechanical arm are opened and closed through the two rotating shafts, the human body requirements of different fat-thin body types can be met, the practicability is good, the connecting rod can meet the requirement of a human body on balance in the holding and lifting process, and the inclination of the left shoulder and the right shoulder does not occur.

For the buttock supporter, see fig. 1, fig. 6 to fig. 13B and fig. 22 specifically, including support B1 and buttock backup pad B2, support B1 sets up on car base C, buttock backup pad B2 rotates to be connected on support B1, and buttock backup pad B2 is two bilateral symmetry, form an arc breach B0 between two buttock backup pads B2, specifically, be equipped with the arc breach of axisymmetry on two buttock backup pads B2 about, certain interval is also left between two buttock layer board B1 about simultaneously, thereby form intermediate breach B0, set up this intermediate breach B0, its main aim is that the user can go on like the lavatory conveniently, the user can directly go on the nursing car, it is comparatively convenient to get off, be equipped with linear actuator B3 on buttock backup pad B2, still be equipped with link assembly B4 between support B1 and the buttock backup pad B2, link assembly B4 one end is connected with support B1 rotation, the other end is connected with linear actuator B3 rotation, buttock backup pad mechanism still includes the locking piece B5 to link assembly B4 locking, locking piece B5 when locking piece B1 is in the state of locking piece, can rotate relative to support B2B 1, the rotation is in the state of rotating piece is in relative to the rotation of support B2. When the locking piece B5 is in a locking state, the linear driver B3 drives the connecting rod assembly B4 to drive the hip support plate B2 to rotate relative to the support B1, so that the hip support plate B2 is driven to rotate electrically, and when the linear driver B3 cannot work normally, the hip support plate B2 can be driven to rotate around the support B1 manually at the moment by enabling the locking piece B5 to be in an unlocking state, so that objects are prevented from being blocked on a shifting vehicle, and the safety of the disabled-assistant shifting vehicle in use is improved.

In this embodiment, the link assembly B4 includes a first link B41 and a second link B42, one end of the first link B41 is rotatably connected to the linear driver B3, the other end of the first link B41 is rotatably connected to the second link B42, one end of the second link B42 remote from the first link B41 is rotatably connected to the bracket B1, the second link B42 is not rotatable with respect to the bracket B1 when the locking member B5 is in the locked state, the linear driver B3 drives the hip support plate B2 to rotate with respect to the bracket B1, and the second link B42 is rotatable with respect to the bracket B1 and the hip support plate B2 is manually rotatable with respect to the bracket B1 when the locking member B5 is in the unlocked state. When the locking piece B5 is in a locking state, the second connecting rod B42 is not rotatable relative to the support B1, the linear driver B3 drives the first connecting rod B41 to rotate relative to the second connecting rod B42, at the moment, the hip support plate B2 rotates relative to the support B1, when the locking piece B5 is in an unlocking state, the first connecting rod B41 rotates relative to the second connecting rod B42, the second connecting rod B42 rotates relative to the support B1, the hip support plate B2 can rotate relative to the support B1 by manually rotating the hip support plate B2, manual rotation adjustment of the hip support plate B2 is achieved, symmetry is prevented from being clamped on a disabled-assisting shift vehicle, and safety of the disabled-assisting shift vehicle is improved.

In the present embodiment, the second link B42 includes a sleeve B4201, a first connection plate B4202 and a second connection plate B4203, the first connection plate B4202 and the second connection plate B4203 are mounted on a side wall of the sleeve B4201 and are disposed on the same side, a clamp spring pin B6 is rotatably connected between ends of the first connection plate B4202 and the second connection plate B4203 far from the sleeve B4201, one end of the first link B41 far from the linear actuator B3 is rotatably mounted on the clamp spring pin B6, a connection shaft B7 is connected between the hip support plate B2 and the bracket B1, and the sleeve B4201 is rotatably mounted on the connection shaft B7. The sleeve B4201 is rotatably connected to the connecting shaft B7, the first connecting plate B4202 and the second connecting plate B4203 can rotate along with the sleeve B4201, when the sleeve B4201 is in a locked state, the locking member B5 limits the first connecting plate B4202 and the second connecting plate B4203 to rotate, the linear driver B3 drives the first connecting rod B41 to rotate relative to the clamp spring pin B6, when the sleeve B4201 is in an unlocked state, the first connecting plate B4202 and the second connecting plate B4203 can rotate relative to the connecting shaft B7, the first connecting plate B4202 and the second connecting plate B4203 can rotate along with the sleeve B4201, at the moment, the first connecting rod B41 can also rotate relative to the clamp spring pin B6, and therefore manual rotation of the hip support plate B2 can be achieved, the strength of the second connecting rod B42 is enhanced due to the arrangement of the first connecting plate B4202 and the second connecting plate B4203, and stability of the hip support plate B2 is ensured when the sleeve B is manually rotated.

In the present embodiment, the bracket B1 is provided with a first movable groove B9 for swinging the first connection board B4203 and the second connection board B4203. By providing the bracket B1 with the first movable groove B9 for swinging the first connection plate B4202 and the second connection plate B4203, the first movable groove B9 can limit the movable range of the first connection plate B4202 and the second connection plate B4203, prevent the first connection plate B4202 and the second connection plate B4203 from swinging when rotating, and improve the rotation stability of the hip support plate B2.

In this embodiment, the distance between the inner wall of the first movable groove B9 and a side wall of the first connection plate B4202 away from the second connection plate B4203 is M,0 < M < 3cm. In this embodiment, M is 2cm. This arrangement ensures that the first connection plate B4202 and the second connection plate B4203 are not rubbed against the inner wall of the first movable groove B9 when rotated.

In this embodiment, the locking member B5 includes a locking bolt B52 and a pull ring B52, and the second connecting rod B42 and the bracket B1 are both provided with a positioning hole B10 for moving the locking bolt B52. The second connecting rod B42 is connected with the support B1 through the connection of the second connecting rod B42 and the support B10, the second connecting rod B42 cannot rotate at the moment, the locking piece B5 is in a locking state, the linear driver B3 drives the first connecting rod B41 to rotate around the second connecting rod B42, the hip support plate B2 rotates relative to the support B1, the second connecting rod B42 is separated from the support B1 after the locking bolt B52 is pulled out, the second connecting rod B42 can rotate around the support B1, the first connecting rod B41 rotates relative to the second connecting rod B42, the second connecting rod B42 rotates relative to the support B1, and the hip support plate B2 can be manually rotated at the moment.

In this embodiment, the linear actuator B3 is installed in the hip support plate B2. The linear driver B3 is arranged in the hip support plate B2, so that the hidden arrangement of the linear driver B3 is realized, the structure of the shift vehicle is more compact, and the appearance is more attractive.

In this embodiment, the hip support plate B2 and the bracket B1 are each provided with locking teeth B8 at opposite ends thereof. The provision of the locking teeth B8 prevents the buttocks support plate B2 and the supporter B1 from shaking in a closed state.

In the present embodiment, the hip support plate B2 is provided with a second movable groove B11 in which the link assembly B4 swings. Through establishing the second movable groove B11 that supplies link assembly B4 wobbling on buttock backup pad B2, can restrict link assembly B4 wobbling scope on the one hand, realize buttock backup pad B2 rotatory in the safe region, on the other hand has also avoided rocking when first link B41 rotates, improves the travelling comfort when shifting the car and uses.

For lifting upright posts, see fig. 1 and fig. 14-20 specifically, the lifting upright post comprises an outer tube D11 and an inner tube D12, wherein the inner tube D12 is fixedly connected with a shifting vehicle base, the outer tube D11 is driven by an electric push rod to stretch along the outer wall of the inner tube D12, the electric push rod is arranged at the bottom of the inner side of the inner tube, the electric push rod is provided with a safety release device D14, and the safety release device D14 is provided with a safety release switch D141.

In order to facilitate the operation of the safety release switch D141, the safety release device D14 is located inside the bottom of the inner tube and the safety release switch D141 extends below the safety release device D14. The safety release device further comprises a safety release connecting rod assembly D15 for pressing the safety release switch, wherein the safety release connecting rod assembly D15 comprises a horizontal movement connecting rod D151 and a rotation connecting rod D152, one end of the horizontal movement connecting rod D151 is connected with a safety release button D153, the other end of the horizontal movement connecting rod D151 is connected with the rotation connecting rod D152, and the rotation connecting rod D152 is provided with a top plate for pushing the safety release switch upwards.

The lifting upright post can be emergently lowered by only pressing the safety release button arranged on the side surface of the vehicle base through the safety release connecting rod assembly acting on the safety release switch, and the operation is convenient. The safety release button D153 is positioned on the side surface of the shifting cart base, can be a front side surface, a left side surface, a right side surface or a rear side surface, and can be operated by bending over a nursing object.

The rotating connecting rod D152 comprises a vertical section and a horizontal section which are connected into a V shape, the bottom of the vertical section is hinged with the horizontal moving connecting rod, the connecting part of the vertical section and the horizontal section is rotationally connected with a rotating shaft, and the top plate is arranged on the horizontal section. In order to guide the horizontal moving rod to move horizontally and linearly, the horizontal moving connecting rod is connected with the guide hole in a sliding manner. The safety release button only needs to be lightly pressed to drive the rotary connecting rod, and then the safety release switch is pushed upwards by the top plate, so that the operation experience is further improved.

The safety release quick-closing D141 of the safety release device is provided with a return structure, and can be reset after the safety release button is released, so that the safety release connecting rod assembly is pushed to return. Of course, further, in order to ensure that the safety release button can be accurately reset, a reset spring may be connected to the safety release button.

Referring to fig. 19, the guide rail includes a guide rail bar D111 connected to the outer pipe and a guide rail slider D122 connected to the inner pipe, the guide rail slider D122 having a guide rail groove slidably fitted with the guide rail bar. The conventional lifting column is in a vertical state, but since the lifting column is inclined rearward in this embodiment, it receives a force downward of the rear side in a use state, and the conventional rail slider is short, and is easily deformed or even damaged when receiving a large force. In order to increase the contact area between the guide rail slide block D122 and the guide rail strip D111, the length of the guide rail slide block D122 is more than one third of the length of the inner pipe, so that a larger stress area is ensured between the guide rail slide block D122 and the guide rail strip D111. Those skilled in the art will appreciate that the length of the rail block D122 may be up to the same length as the inner tube.

It will be appreciated by those skilled in the art that the relative movement relationship between the outer tube and the inner tube may be interchanged, as may the relative movement relationship between the rail and the rail slide.

Further, the rail blocks, which are at least one fifth of the length of the inner tube, remain engaged with the rail strips when the outer tube is extended outwardly to the extreme position. At the moment, even if the guide rail sliding block and the inner pipe are subjected to larger backward pressure, the guide rail sliding block and the inner pipe are not easy to deform and be damaged by stress. It will be appreciated by those skilled in the art that the rail block D122 may be a generally elongated structure extending from the bottom end of the inner tube to the top end, although a split structure having at least two portions may be employed, wherein the bottom portion is connected to the bottom of the inner tube such that the bottom portion remains engaged with the rail bar when the inner tube is extended outwardly to the extreme position.

In addition, there is a gap between the outer tube D11 and the inner tube D12, and the outer tube is easy to shake during expansion and contraction, and when the outer tube is considered to extend upwards for a long time and is subjected to a large external force, the gap between the outer tube D11 and the inner tube D12 is large, and the outer tube is easy to deform under stress, and the lower front side inner wall of the outer tube is connected with a pad D13 supported on the outer wall of the inner tube or/and the upper front side outer wall of the inner tube is connected with a pad D13 supported on the inner wall of the outer tube. When the outer tube D11 extends upwards for a long time and is subjected to a large downward pressure towards the rear side, the guide rail supports the outer tube D11 at the rear, and the pad D13 supports the inner tube D12 at the front, so that a large supporting force is ensured between the outer tube D11 and the inner tube D12, and the inner tube and the outer tube are not easy to deform under the stress.

Referring to fig. 5 to 7, the horizontal projection of the lifting upright post is in a shape with a front narrow and a rear wide and gradually changed width, which approximates to an isosceles triangle, corners are in arc transition, and the pad D13 is arranged at the front side angle position of the isosceles triangle. Simultaneously, the left and right sides of the rear part of the lifting upright post are provided with two groups of guide rails side by side. The inner tube can bear larger downward pressure by increasing the number of the guide rails. The left side and the right side of the rear part of the inner tube are respectively provided with a groove D121 which extends up and down, and the guide rail is arranged in the groove D121, so that the guide rail is convenient to install and the space between the inner tube and the outer tube is utilized intensively.

As an implementation manner, the guide rail is a V-shaped guide rail, so that a large contact area is formed between the guide rail sliding block and the guide rail strip, and the guide rail can bear large downward pressure and certain lateral force. Of course, those skilled in the art will appreciate that dovetail rail or other existing rail configurations may be used instead.

In order to reduce the friction of the guide rail, the wear is reduced. And a self-lubricating nylon bushing D123 is arranged in the guide rail groove. The friction coefficient of nylon decreases with the increase of load, and can decrease to about 0.1-0.15 under the condition of high load, thus having better lubricating performance. And nylon has good abrasion resistance. Here, in order to install the self-lubricating nylon bush D123, the inner wall of the guide rail groove is provided with a caulking groove, and the self-lubricating nylon bush is embedded in the caulking groove and glued and fixed.

In addition, the outer tube D11 and the guide rail strip D111 are metal profiles with an integrated structure, so that the integrated processing and forming are convenient. The inner tube D12 and the guide rail slide block D122 are all metal profiles and are fixed together by screws, and the inner tube D12 and the guide rail slide block D122 are assembled together with the outer tube D11 after being installed.

In this embodiment, when the user wants to shift from one position to another, for example, shift from a bed to a toilet, the user sits at the bedside with the help of a carer, the shift cart approaches the user, to the foot-operated area of the cart base, the user lifts up the user with the armpit support plate to hold the armpit of the user, when the buttocks of the user leave the bed by 10cm, the buttocks support plate is rotated to the position below the buttocks of the user, then the user is put down, until the user sits on the buttocks support plate, see fig. 21, the carer pushes the shift cart carrying the user to the target position, as shown in fig. 22, the user can go through the arc-shaped notch B0 formed between the left and right buttocks support plates B2, the user can go directly on the nursing cart, the user does not need to get off, the user can rotate the buttocks support plate to the two sides of the shift cart conveniently, the height of the armpit of the shift cart is lowered, the user sits down to the armpit of the user stably, the user sits on the target position, the user is separated from the buttocks support plate, and the shift cart is pulled away from the user, and the shift process is finished; referring to fig. 23, for another use function of the displacement cart in this embodiment, when the user slowly stands up under the lifting of the underarm support plate of the displacement cart, the lifting height can be properly adjusted according to the wish and physical state of the user, the user can try to move the steps according to the physical state of the user, the bottom of the displacement cart is provided with pulleys, the pulleys can move along with the user, and the user can be continuously supported, so that the user can be prevented from falling down, and when the user feels physical weakness, the user can choose to sit on the displacement cart for rest or sit on a chair for rest.

Embodiment two:

In the shifting cart according to the first embodiment, referring to fig. 24, the shifting cart further includes a knee baffle F disposed at a front side of the hip support body for preventing a human body from sliding forward, and the knee baffle can limit a knee of the user when the user sits on the hip support body during use, thereby preventing the user from tilting forward.

In this embodiment, since the object to be used is sitting on the displacement cart, the displacement cart moves in the left-right direction of the object to be used by the armpit supporting plate, the hip supporting body moves in the up-down direction of the object to be used by the knee baffle to prevent the object to be used from sliding forward, the left-right direction of the object to be used is already limited, the front-back direction of the object to be used is already limited, and the vertical direction of the object to be used is also supported, so that a multidirectional positioning effect is achieved.

In addition, the shift car is also provided with a waterproof layer, through the fixing mode and the waterproof layer in the embodiment, the use object can be used in the bathroom, the use object only needs to be seated on the shift car in advance and then the shift car carrying the use object is pushed into the bathroom by a nurse, the use object seated on the shift car can independently finish bathing or other people to assist bathing according to the self condition, and the sliding and tilting condition can not occur in the bathing process.

Embodiment III:

The shift cart according to the first and second embodiments has the following differences, referring to fig. 25 and 26, in this embodiment, the left mechanical arm and the right mechanical arm are connected by an arm driving device, the arm driving device includes a first tooth and a second tooth, the first tooth is linked with the second tooth, the first tooth drives the left mechanical arm A1 through the left rotating shaft A3, the second tooth drives the right mechanical arm A2 through the right rotating shaft A4, and the first tooth or the second tooth rotates to control the left mechanical arm A1 and the right mechanical arm A2 to be close or separated.

For example, the first tooth and the second tooth mesh, and the first tooth rotates reversely when the steering direction of the first tooth is changed. For example, in this embodiment, the first tooth includes a first gear A6 and a second gear A7 that are coaxially fixed, the second tooth includes a third gear A8 and a fourth gear A9 that are coaxially fixed, the first gear A6, the second gear A7, the third gear A8 and the fourth gear A9 are all horizontally disposed, the radius of the second gear A7 is smaller than that of the first gear A6, the radius of the fourth gear A9 is smaller than that of the third gear A8, the first gear A6 is meshed with the third gear A8, the second gear A7 is separated from the fourth gear A9, the first gear A6 drives the third gear A8, and the third gear A8 drives the fourth gear A9 to rotate. The left rotating shaft A3 is fixedly provided with a fifth gear A10, the right rotating shaft A4 is fixedly provided with a sixth gear A11, the second gear A7 is meshed with the fifth gear A10 by helical teeth, and the fourth gear A9 is meshed with the sixth gear A11 by helical teeth, so that the first gear A6 rotates forwards or reversely to realize simultaneous transmission of the left rotating shaft A3 and the right rotating shaft A4, and at the moment, the left rotating shaft A3 and the right rotating shaft A4 simultaneously rotate in a direction far away from the trunk or simultaneously approach the trunk.

The transmission ratio between the second gear A7 and the fifth gear a10 is equal to or approximately equal to the product of the transmission ratio between the first gear A6 and the third gear A8 and the transmission ratio between the fourth gear A9 and the sixth gear a11, the angular speeds of the left rotating shaft A3 and the right rotating shaft A4 are the same or similar, and when the symmetrical vertical plane between the corresponding left mechanical arm A1 and the right mechanical arm A2 coincides with the central axis of the trunk, the left mechanical arm A1 and the right mechanical arm A2 can hold or release the trunk simultaneously, and the trunk cannot incline during holding.

In addition, taking the left rotating shaft A3 as an example, the smaller the included angle between the left rotating shaft A3 and the horizontal plane is, the closer the rotating plane of the left mechanical arm A1 is to the vertical plane, the poor comfort level of the human body is, and the larger the included angle between the left rotating shaft A3 and the horizontal plane is, the closer the rotating plane of the left mechanical arm A1 is to the horizontal plane, the weak the rotating trend of the left rotating shaft A3 under the action of gravity is, and the weak holding force to the left side of the trunk is. Therefore, the included angle between the left rotating shaft A3 and the horizontal plane is set in the range of 45-75 degrees.

Embodiment four:

The shift cart according to the first to third embodiments, which has the following differences, is shown in fig. 27, in which the arm driving device includes a motor a12, a first tooth, a second tooth, a first worm wheel a13, a second worm wheel a14, a first screw a15, and a second screw a16. The first screw A15 is meshed with the first worm gear A13, the first worm gear A13 is meshed with the first teeth, the motor A12 drives the first teeth through the first screw A15, and the first teeth and the left rotating shaft A3 are coaxially fixed. The second screw A16 is meshed with the second worm wheel A14, the second worm wheel A14 is meshed with second teeth, the motor A12 drives the second teeth through the second screw A16, and the second teeth and the right rotating shaft A4 are coaxially fixed. The ratio of the first screw a15 to the first worm wheel a13 and the ratio of the first worm wheel a13 to the first tooth are equal or approximately equal to the ratio of the second screw a16 to the second worm wheel a14 and the ratio of the second worm wheel a14 to the second tooth, where the angular velocities of the first tooth and the second tooth are equal or approximately equal.

In addition, the motor shaft, the end of the first screw a15 and the end of the second screw a16 are fixed with bevel gears, the bevel gears at the end of the motor shaft are simultaneously meshed with the bevel gears at the end of the first screw a15 and the bevel gears at the end of the second screw a16, and the transmission ratio between the bevel gears at the end of the motor shaft and the bevel gears at the end of the first screw a15 is equal to or approximately equal to the transmission ratio between the bevel gears at the end of the motor shaft and the bevel gears at the end of the second screw a 16.

While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.

Claims

1. The utility model provides a shift car, includes car base, its characterized in that:

lifting upright posts arranged on the vehicle base;

the left mechanical arm and the right mechanical arm are arranged on the lifting upright post and used for lifting armpits of a human body respectively, and the left mechanical arm and the right mechanical arm hold the trunk of the human body tightly;

the hip support body is arranged below the left mechanical arm and the right mechanical arm and used for supporting the buttocks of a human body;

The left mechanical arm and the right mechanical arm lift and put down a human body under the driving force of the lifting upright post;

The buttock support body comprises a support and a buttock support plate, the support is arranged on the vehicle base, the support is rotationally connected with the buttock support plate, a linear driver is arranged on the buttock support plate, a connecting rod assembly is further arranged between the support and the buttock support plate, one end of the connecting rod assembly is rotationally connected with the support, the other end of the connecting rod assembly is rotationally connected with the linear driver, the buttock support body further comprises a locking piece for locking the connecting rod assembly, when the locking piece is in a locking state, the linear driver drives the buttock support plate to rotate relative to the support, and when the locking piece is in an unlocking state, the buttock support plate can manually rotate relative to the support;

The connecting rod assembly comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is rotationally connected with the linear driver, the other end of the first connecting rod is rotationally connected with the second connecting rod, one end of the second connecting rod, which is far away from the first connecting rod, is rotationally connected with the bracket, when the locking piece is in a locking state, the second connecting rod is non-rotatable relative to the bracket, the linear driver drives the hip support plate to rotate relative to the bracket, when the locking piece is in an unlocking state, the second connecting rod is rotatable relative to the bracket, and the hip support plate is manually rotatable relative to the bracket;

The second connecting rod comprises a sleeve, a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are arranged on the side wall of the sleeve and are arranged on the same side, a clamp spring pin is rotationally connected between the ends of the first connecting plate and the second connecting plate, which are far away from the sleeve, one end of the first connecting rod, which is far away from the linear driver, is rotationally arranged on the clamp spring pin, a connecting shaft is connected between the hip supporting plate and the bracket, and the sleeve is rotationally arranged on the connecting shaft;

The first connecting rod is arranged between the first connecting plate and the second connecting plate, and a limiting shaft sleeve for limiting the sliding of the first connecting rod is arranged on the clamp spring pin;

The locking piece comprises a locking bolt and a pull ring, and the second connecting rod and the bracket are respectively provided with a positioning hole for the locking bolt to move.

2. The shift car of claim 1, wherein the lifting upright post is provided with two rotating shafts, the left mechanical arm and the right mechanical arm are respectively arranged around the two rotating shafts in a rotating way, the included angle between the rotating shafts and the horizontal plane is alpha, 0< alpha <90 degrees, and the left mechanical arm and the right mechanical arm generate a movement trend of rotating towards the human body trunk under the action of gravity.

3. The shift car of claim 2, wherein the rotating shaft is provided with an end plate, the end plate is axially inclined relative to the rotating shaft, the axial included angle between the end plate and the rotating shaft is beta, 0 degrees < beta <45 degrees, the end plate is provided with a rotating hole, the axial distance between the rotating hole and the rotating shaft is d,30mm < d <60mm, a connecting rod is connected between the two end plates, and the end part of the connecting rod is rotatably arranged at the rotating hole.

4. A shift car as set forth in claim 3, wherein a gear is provided between the inner sides of the left and right arms for limiting a closing angle between the two arms.

5. The shift car as set forth in claim 4, wherein the gear is a spring, an electric push rod or a cylinder.

6. The shift car of claim 2, wherein the left mechanical arm and the right mechanical arm are connected through an arm driving device, the arm driving device comprises a first tooth and a second tooth, the two rotating shafts are a left rotating shaft and a right rotating shaft respectively, the first tooth and the second tooth are linked, the first tooth drives the left mechanical arm through the left rotating shaft, the second tooth drives the right mechanical arm through the right rotating shaft, the rotation of the first tooth or the second tooth controls the left mechanical arm and the right mechanical arm to synchronously close or separate, the angular speeds of the left mechanical arm and the right mechanical arm are the same, and the left mechanical arm and the right mechanical arm are symmetrically arranged along a vertical plane.

7. A shift truck as defined in claim 6, wherein the first gear comprises a first gear and a second gear which are coaxially fixed, the second gear comprises a third gear and a fourth gear which are coaxially fixed, the first gear is meshed with the third gear, a fifth gear is fixed on the left rotating shaft, a sixth gear is fixed on the right rotating shaft, the second gear is meshed with the fifth gear, and the fourth gear is meshed with the sixth gear.

8. The displacement cart of claim 1,2, 3 or 6, wherein the left and right mechanical arms are provided with a pad simulating the shape of a human hand.

9. A displacement car as claimed in claim 1, wherein the hip support plate and the bracket are provided with locking teeth at opposite ends thereof.

10. The displacement car of claim 1, wherein the hip support body comprises two hip support plates, the two hip support plates are arranged in bilateral symmetry with respect to the horizontal axis of the bracket, and an arc-shaped notch is arranged between the two hip support plates.

11. The shift car as set forth in claim 1, wherein the lifting column comprises an inner tube, an electric push rod arranged at the bottom of the inner side of the inner tube, and an outer tube which is driven by the electric push rod to extend and retract along the outer side of the inner tube, the electric push rod is provided with a safety release device, the safety release device is provided with a safety release switch, the shift car further comprises a safety release connecting rod assembly for pressing the safety release switch, and the car base is provided with a safety release button for driving the safety release connecting rod assembly to act.

12. The shift car as set forth in claim 11, wherein the safety release device is located inside the bottom of the inner tube and the safety release switch extends below the safety release device, the safety release link assembly comprises a horizontal moving link and a rotating link, the horizontal moving link is movably connected to the shift car base horizontally, one end of the horizontal moving link is connected to the safety release button, the other end is connected to the rotating link, the safety release button is located on the side of the shift car base, the rotating link is provided with a top plate pushing the safety release switch upwards, and the safety release button is connected to a return spring.

13. The shift car as set forth in claim 12, wherein the rotary link comprises a vertical section and a horizontal section connected in a V-shape, the bottom of the vertical section is hinged to the horizontal movable link, the connection part of the vertical section and the horizontal section is rotatably connected to the rotary shaft, and the top plate is disposed on the horizontal section.

14. A shift car as set forth in claim 12, wherein the lifting column is disposed obliquely rearward, the guide rail comprises a guide rail strip connected to the outer tube and a guide rail slider connected to the inner tube, the guide rail slider has a guide rail groove slidably engaged with the guide rail strip, the length of the guide rail slider is greater than one third of the length of the inner tube, and the guide rail slider having at least one fifth of the length of the inner tube remains engaged with the guide rail strip when the outer tube is extended outward to the limit position.

15. The shift car of claim 12, wherein the horizontal projection of the lifting upright is in a shape with narrow front and wide rear and gradually changed width, and two groups of guide rails are arranged on the left side and the right side of the rear part of the lifting upright side by side.

16. A shift car as set forth in claim 12, wherein the lifting column further comprises a pad, and the pad supported on the outer wall of the inner tube is connected to the inner wall of the lower portion of the outer tube or/and the pad supported on the inner wall of the outer tube is connected to the outer wall of the upper portion of the inner tube.

17. The shift car as set forth in claim 14, wherein the lifting column further comprises a backing plate, and the guide rail groove is provided with a self-lubricating nylon bushing.