CN111643081B

CN111643081B - Angle-adjustable movable seat

Info

Publication number: CN111643081B
Application number: CN202010539598.7A
Authority: CN
Inventors: 陈强; 刘大鹏; 路志强; 程东芹
Original assignee: Shandong Aoxin Medical Technology Co ltd
Current assignee: Shandong Aoxin Medical Technology Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-06-25
Anticipated expiration: 2040-06-15
Also published as: CN111643081A

Abstract

The invention relates to a movable chair with an adjustable angle, which comprises a base frame, a seat board, a backrest board, a first supporting arm, a second supporting arm and a locking device, wherein the first supporting arm is connected with the backrest board; the backrest plate is hinged on the base frame; the back end of the seat board is hinged on the back board, and the front end is hinged with a leg supporting board; one end of the first supporting arm is hinged on the leg supporting plate, and the other end of the first supporting arm is hinged on the backrest plate; one end of the second supporting arm is hinged on the seat board, and the other end of the second supporting arm is hinged on the base frame; when the backrest plate rotates relative to the base frame, the seat plate and the leg supporting plate are driven to move together; the locking device is arranged between the seat board and the leg supporting board and has the locking and braking functions. The movable seat with the adjustable angle can be sat and laid, is movable, is stably adjusted, is safe and comfortable, is suitable for multiple people, helps patients to finish detection quickly and comfortably, and is particularly suitable for limb magnetic resonance imaging.

Description

Angle-adjustable movable seat

Technical Field

The invention relates to a movable seat with an adjustable angle, and belongs to the technical field of medical equipment.

Background

The magnetic resonance imaging technology is a technology for imaging by utilizing the characteristic expression of a magnetic nucleus in a living body in a strong magnetic field, and has the advantages of rich image density levels, good image contrast, good soft tissue imaging effect, high resolution, no dead angle artifact, no radioactive hazard, early diagnosis of tumors and the like. With the improvement of the national living standard, the requirements of people on medical diagnosis are higher and higher, and the use of magnetic resonance imaging is increased year by year.

In recent years, with the development of magnetic resonance imaging technology, new products are continuously introduced into magnetic resonance imaging systems. An extremity magnetic resonance imaging system is a medical imaging system mainly used for ankle, knee, hand and elbow parts of a human body. The imaging system has a small imaging area, and only the imaging part of a human body needs to be placed in the imaging hole of the magnet during imaging. The existing device for bearing the patient by the magnetic resonance imaging system is mostly an auxiliary sickbed which is fixed on the ground or integrated with a magnetic resonance instrument, and a bed board of the sickbed is required to extend into an imaging hole of a magnet during imaging, and is mostly aimed at the whole body type magnetic resonance imaging. Because the auxiliary sickbed is mostly directed at a whole-body type magnetic resonance imaging system, a bed board of the auxiliary sickbed needs to extend into an imaging hole of a magnet during imaging, which is obviously not applicable to the limb end magnetic resonance imaging system with a smaller imaging area. Meanwhile, the auxiliary hospital bed is fixed on the ground or integrated with a magnetic resonance instrument, so that the auxiliary hospital bed has the defects of large volume, large floor area, immobility and the like in order to meet the requirements of different patients and the adjustment of the auxiliary hospital bed up and down and back and forth. Is not suitable for the limb magnetic resonance imaging which is convenient to require and flexible.

A chair for a limb end magnetic resonance imaging system in the prior art is similar to a common chair in structure, cannot adapt to detection of different parts of a patient, such as ankles, knees, hands, elbows and the like, and is poor in comfort level when the patient uses the chair.

Disclosure of Invention

The invention aims to solve the technical problem that the angle-adjustable movable seat is provided, can be sat and laid, is movable, is stably adjusted, is safe and comfortable, is suitable for a plurality of people, helps patients to quickly and comfortably complete detection, and is particularly suitable for the movable seat of extremity magnetic resonance imaging.

In order to solve the above problems, the technical scheme adopted by the invention is as follows:

a movable chair with adjustable angle comprises a base frame, a seat board and a back board, wherein the back board is hinged on the base frame; the back end of the seat board is hinged on the back board, and the front end is hinged with the leg supporting board; the support device also comprises a first support arm and a second support arm; one end of the first supporting arm is hinged on the leg supporting plate, and the other end of the first supporting arm is hinged on the backrest plate; one end of the second supporting arm is hinged on the seat board, and the other end of the second supporting arm is hinged on the base frame; when the back board rotates relative to the base frame, the seat board and the leg supporting board are driven to move together.

As an improvement, the backrest plate is hinged with the base frame assembly through a central rotating shaft, the seat plate is hinged with the backrest plate through a seat plate rotating shaft, and the backrest plate is hinged with the first supporting arm through a first rotating shaft. Wherein the seat plate rotation shaft and the first rotation shaft are respectively located at an upper side and a lower side of the central rotation shaft.

As an improvement, the locking device is arranged between the seat plate and the leg supporting plate, or between the seat plate and the back plate, or between the first supporting arm and the leg supporting plate, or between the back plate and the first supporting arm; the locking device has a locking braking function.

As an improvement, the locking means is a hydraulic spring or a self-locking type gas spring installed between the seat plate and the leg rest.

As an improvement, the number of the locking devices is two, one of the two locking devices is a hydraulic spring, and the other locking device is a self-locking type gas spring.

As an improvement, the seat board is provided with a rotatably arranged adjusting rod, and the adjusting rod is connected with a control switch of the locking device through a pull wire; the adjusting rod is rotated, and a control switch of the locking device can be opened through the pull wire.

As an improvement, the back board is provided with a limiting sleeve, the base frame is provided with a limiting groove, and the limiting sleeve is arranged in the limiting groove.

As an improvement, the base frame comprises a support frame, the rear end of the support frame is provided with a support arm which is obliquely arranged from bottom to top, and the backrest plate, the first support arm and the second support arm are all hinged on the support arm; two front roller supporting plates arranged at intervals are installed at the front end of the supporting frame, two rear roller supporting plates arranged at intervals are installed at the rear end of the supporting frame, and rollers are installed on the front roller supporting plates and the rear roller supporting plates.

As an improvement, the seat plate, the leg supporting plate and the second supporting arm are hinged together through a leg supporting plate rotating shaft, and the leg supporting plate rotating shaft is located at the upper position of the leg supporting plate.

As an improvement, the mobile seat further comprises a seat pan assembly and two armrests; the seat plate assembly comprises a seat plate, a seat plate shell and a seat cushion, the seat cushion is arranged on the seat plate, and the seat plate and the seat cushion are positioned on the inner side of the seat plate shell; the two handrails are both arranged on the base frame; the two handrails are respectively positioned at the two sides of the seat board.

By adopting the technical scheme, compared with the prior art, the invention has the following advantages:

the movable seat has the capability of being moved forwards, backwards, leftwards and rightwards and braking at 360 degrees at any time and any place. The movable seat adopts a purely mechanical structure operated manually, and uses a hydraulic spring or a gas spring as an important adjusting component.

The movable seat uses the universal wheels and the directional wheels, so that the seat can move in any direction, and meanwhile, the universal wheels have a braking function, so that the position of the movable seat can be locked at any time and any place. Compared with the complicated operation of the auxiliary sickbed, the design greatly simplifies the operation process and is more flexible to use. Simultaneously for the sick bed, seat itself has small in size, and area is little characteristics, and to the little room of part operating space, this advantage is more outstanding.

The movable chair provided by the invention is additionally provided with the backrest component, and the leg support component has the angle adjustable function, so that the requirement that different patients need to use different postures for detection is met. And through the structure that the front part is wide and the rear part is narrow and the gravity center moves forwards downwards, the supporting surface of the gravity center is increased, the force required when the seat is moved is reduced, the phenomenon that the movable seat is toppled over is avoided, and meanwhile, the chair cannot be blocked when other people push and pull the seat.

This angle adjustable removes seat is particularly useful for the removal seat of acrosome magnetic resonance imaging, has compact structure, adjusts nimble simple and convenient, and the magnetism does not have, adjusts steadily slowly, convenient comfortable advantage such as, and help patient detects fast.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic perspective view of a mobile angularly adjustable seat according to an embodiment of the present invention;

FIG. 2 is a first schematic structural diagram of the present invention;

FIG. 3 is a schematic of the present invention;

FIG. 4 is a side view of the present invention;

FIG. 5 is a schematic view of the base of FIG. 2;

FIG. 6 is a schematic illustration of the seat plate assembly of FIG. 2;

FIG. 7 is a schematic view of the backrest module of FIG. 2;

FIG. 8 is a schematic view of the leg rest assembly of FIG. 2;

FIG. 9 is a use state reference diagram of the present invention;

FIG. 10 is a schematic view of the hydraulic spring of the present invention;

in the figure, 1-base frame, 11-support frame, 12-front roller support plate, 13-rear roller support plate, 14-limit groove, 15-support arm, 2-moving component, 21-directional wheel, 22-universal wheel, 3-adjusting transmission and control component, 31-second support arm, 32-mounting bracket, 33-hydraulic spring, 34-bracing wire bracket, 35-first support arm, 36-leg support plate rotating shaft, 37-first rotating shaft, 38-seat plate rotating shaft, 39-central rotating shaft, 310-limit sleeve, 311-second rotating shaft, 312-adjusting rod, 313-bracing wire, 314-third rotating shaft, 4-seat plate component, 41-seat plate, 5-backrest component, 51-backrest plate, 6-leg support component, 61-leg supporting plate, 7-handrail component, 8-shell and protection component.

Detailed Description

For ease of illustration and not by way of limitation, the front of the user when seated in the seat is defined as front, the rear of the user is defined as rear, and the resulting left and right.

The high-intensity magnetic field environment refers to an environment with a large magnetic field intensity. In a strong magnetic field environment, a great interaction force is generated with a magnetic material.

The magnetic resonance apparatus is an apparatus for scanning and imaging living beings by utilizing the nuclear magnetic resonance principle in an ultra-strong magnetic field. The magnetic field can generate super strong magnetic field, and can generate strong interaction force with magnetic material.

Non-magnetic material refers to a material that is not or is weakly magnetic. This is a material that does not generate or generates a minute magnetic force in a magnetic field.

Examples

As shown in fig. 1, 2, 3 and 4, an angularly adjustable moving seat mainly comprises: the seat plate assembly comprises a base frame 1, a moving assembly 2, an adjusting transmission and control assembly 3, a seat plate assembly 4, a backrest assembly 5, a leg support assembly 6, an armrest assembly 7, a shell and a protection assembly 8. The whole movable seat is firmly fixed by using the modes of bolts, welding and the like, and the used materials are all non-magnetic materials so as to meet the requirement of use in a high-intensity magnetic field environment.

The base frame 1 is a main stress component and a positioning component of the mobile seat, the base frame 1 comprises a support frame 11, and a support arm 15 which is obliquely arranged from bottom to top is arranged at the rear end of the support frame 11; two front roller supporting plates 12 arranged at intervals are installed at the front end of the supporting frame 11, and two rear roller supporting plates 13 arranged at intervals are installed at the rear end of the supporting frame. The distance of the width of the two front roller support plates 12 is greater than the distance of the width of the two rear roller support plates 13. The base frame 1 is integrally fastened and detachably connected together by bolts. The rest of the mobile chair is directly or indirectly connected with the base frame.

The whole structure of the movable seat is wide in front and narrow in back, the distance between the front directional wheels is widened, and the area of a supporting surface of the center of gravity of the seat is increased. Meanwhile, the rear end of the support frame adopts a support arm which is obliquely arranged from bottom to front and top, so that the whole gravity center of the seat moves forwards. This arrangement ensures that the overall centre of gravity of the seat, whether lying or sitting in the seat, is located near the centre of the support surface when the seat is in use. The occurrence of the seat toppling condition is prevented. Thereby ensuring the safety and stability of the movable seat in the using process.

As shown collectively in fig. 1 and 2, the moving assembly 2 includes two directional wheels 21 and two universal wheels 22. The moving assembly 2 is connected with the base frame 1 through bolts, two directional wheels 21 are respectively arranged on two front roller supporting plates 12 arranged at intervals, and two universal wheels 22 are respectively arranged on two rear roller supporting plates 13 arranged at intervals. The universal wheel 22 has a braking function, and the movable seat can flexibly move in a narrow and limited space through the use of the directional wheel 21 and the universal wheel 22, so that the position of the movable seat can be braked and locked at any time. The distance between the two orienting wheels 21 is greater than the distance between the two universal wheels 22, and the moving seat is more stable when moving.

As shown in fig. 2, 3 and 4 together, the adjustment drive and control assembly 3 functions to adjust the angle and relative position of the seat pan assembly 4, the backrest assembly 5 and the leg rest assembly 6 in the moving seat. The adjustment transmission and control assembly 3 comprises a second support arm 31, a first support arm 35 and a locking device with a locking braking action.

As shown in fig. 6, the seat pan assembly 4 includes a seat pan 41, a seat pan housing 42, and a seat cushion 43. The seat cushion 43 is mounted on the seat plate 41, and the seat plate 41 and the seat cushion 43 are located inside the seat plate case 42. The seat plate housing 42 is made of nonmagnetic materials such as glass fiber reinforced plastics or carbon fibers, and is connected to the seat plate 41 by bolts. The cushion 43 is made of soft material and is connected with the seat plate shell 42 by burr fastening. As shown collectively in fig. 2 and 7, the back assembly 5 includes a back plate 51, a reinforcement plate 52, a back shell 53, and a back pad 54. The back plate 51 and the reinforcing plate 52 are connected by bolts. The back cover 53 is made of nonmagnetic material such as glass fiber reinforced plastic or carbon fiber, and is connected to the back plate 51 and the reinforcing plate 52 by bolts. The back pad 54 is made of soft material and is connected to the back shell 53 by a burr.

As shown collectively in fig. 2, 3 and 8, the leg rest assembly 6 includes a leg rest 61, a leg rest housing 62 and a leg rest pad 63. The leg rest housing 62 is made of nonmagnetic materials such as glass fiber reinforced plastics or carbon fibers and is connected with the leg rest 61 through bolts. The leg rest pad 63 is made of soft material inside and outside and is connected with the leg rest housing 62 by a burr buckle. The user is helped to use the movable chair comfortably. The seat cushion 43, back cushion 54 and leg rest cushion 63 all provide improved comfort when the mobile seat is in use.

As shown in fig. 1 and 2, the armrest assembly 7 includes two armrests 71, and the two armrests 71 are both mounted on the support frame 11 of the base frame 1; the two armrests 71 are respectively located on both side portions of the seat plate 41. The shell and protection assembly 8 comprises a shell part 81, the shell part 81 is a shell positioned on the outer side of the movable seat, the shell part 81 is not only attractive, but also can effectively avoid the situation that a user is clamped by internal components of the movable seat.

The backrest plate 51 is articulated on the support arm 15 of the base frame 1 by means of a central pivot 39. The back end of the seat plate 41 is hinged on the back plate 51 through the seat plate rotating shaft 38, and the front end is hinged with a leg supporting plate 61. The first support arm 35 has one end hinged to the leg rest 61 through the third rotation shaft 314 and the other end hinged to the back plate 51 through the first rotation shaft 37. The second supporting arm 31 has one end hinged to the seat plate 41 and the other end hinged to the supporting arm 15 of the base frame 1 through the second rotating shaft 311. Wherein the seat plate rotation shaft 38 and the first rotation shaft 37 are respectively located at the upper and lower sides of the central rotation shaft 39. Preferably, the seat plate 41, the leg rest 61 and the second support arm 31 are hinged together by a leg rest rotating shaft 36, and the leg rest rotating shaft 36 is located at the upper end position of the leg rest 61. The above structure makes the back board 51, the seat board 41, the leg rest 61 and the first support arm 35 constitute a link structure. When the backrest plate 51 rotates relative to the base frame 1, the seat plate 41 and the leg rest 61 are moved together.

The first support arm 35 and the second support arm 31 are both arranged at the lower side of the seat plate 41, and the hinged part of the first support arm 35 and the seat plate 41 is positioned at the front end part of the seat plate 41; the first support arm 35 and the second support arm 31 each extend in the front-rear direction of the seat plate 41. The number of the first support arms 35 is two, and the two first support arms 35 are disposed at intervals on the lower side of the seat plate 41. The number of the second supporting arms 31 is also two, and the two second supporting arms 31 are arranged at intervals at the lower side of the seat plate 41. The two sets of first supporting arms 35 and the two sets of second supporting arms 31 enable the whole movable seat to be more stable when the angle adjustment of the backrest plate 51, the seat plate 41 and the leg support plate 61 is changed.

Since the back board 51, the seat board 41, the leg rest 61 and the first support arm 35 constitute a link structure, when the adjacent two link members between the adjacent two link members are locked, the entire link structure is in a locked state, and thus the locking device has a locking braking function. The locking device is installed between the seat plate 41 and the leg rest 61, or between the seat plate 41 and the back plate 51, or between the first support arm 35 and the leg rest 61, or between the back plate 51 and the first support arm 35. The locking means is a hydraulic spring 33 or a self-locking type gas spring. The adjusting transmission and control assembly 3 is connected and matched with the base frame 1, the seat plate 41, the backrest plate 51 and the leg supporting plate 61.

The preferred locking means in this embodiment is mounted between the seat plate 41 and the leg rest 61. The number of the locking devices is two, the two locking devices are arranged in parallel, one of the two locking devices is a hydraulic spring 33, and the other locking device is a self-locking type gas spring. A self-locking gas spring is a spring which can be stopped at any position in a stroke by means of some release mechanism and has a large locking force after the stop. The mechanical component is a common mechanical component which can be commercially available, and the specific structure and the control principle of the mechanical component are not innovation points of the invention and are not described in detail herein. As shown in fig. 10, the hydraulic spring is a member formed by combining a control valve with the hydraulic cylinder, the control valve being connected in series with the oil inlet and the oil outlet of the hydraulic cylinder. And whether the inner cavities on the two sides of the piston in the hydraulic cylinder are communicated or not is controlled by opening or closing the control valve. When the control valve is closed, the aim of locking and controlling the position of the piston rod is fulfilled due to the incompressibility of the liquid under the low-pressure condition.

The seat has the characteristic of gentle and stable adjustment. The seat has the advantages that the particularity of a use object can meet the requirements of different patients, the adjusting speed of the seat is gentle as much as possible in order to ensure the comfort of a user, and secondary injury can not be caused to the user. The mobile seat uses a hydraulic spring as a main component of the adjustment mechanism. The hydraulic spring uses hydraulic oil as a transmission medium, and the hydraulic oil has the characteristics of large viscosity and slow flow, so that the seat can move smoothly when being adjusted. Meanwhile, a layer of soft material is added to the place where the shell of the chair is released from a user, so that the chair is more friendly and comfortable to the user.

The adjusting transmission and control assembly 3 further comprises a mounting bracket 32, a wire pulling bracket 34, a first support arm 35, a leg support plate rotating shaft 36, a first rotating shaft 37, a seat plate rotating shaft 38, a center rotating shaft 39, a stop collar 310, a second rotating shaft 311, an adjusting rod 312 and a wire pulling 313. The adjusting rod 312 is rotatably installed on the seat plate 41, and the adjusting rod 312 is connected with a control switch of the locking device through a pull wire 313. Turning the adjustment lever 312 enables the control switch of the locking device to be opened by means of the pull wire 313. After the control switch is opened, the length of the locking device can be adjusted, namely, the locking device is in an unlocked state. After the control switch is closed, the length part of the locking device can be adjusted, namely, the locking device is in a locking state. For the convenience of control, an arrow direction is marked on the adjusting lever 312, so that a user can conveniently know how to rotate the adjusting lever 312 to open the control switch of the locking device.

As shown in fig. 3, the position-limiting sleeve 310 is fixedly installed on the back plate 51, the base frame 1 is provided with a position-limiting groove 14, and the position-limiting sleeve 310 is installed in the position-limiting groove 14. When the back board 51 rotates relative to the base frame 1, the limiting sleeve 310 slides in the limiting groove 14 and limits the back board 51. Preferably, the stop collar 310 is mounted on the inner support arm pivot shaft 37.

The seat plate 41 is provided with a mounting bracket 32 and a wire bracket 34. Preferably, the center of the wire support bracket 34 is collinear with the axis of the leg rest pivot shaft 36. The leg rest 61 also has a mounting bracket 32 mounted thereon. The two ends of the locking device are respectively arranged between the two mounting brackets 32 on the leg supporting plate 61 and the seat plate 41, and the pull wire 313 is connected with the adjusting rod 312 through the pull wire bracket 34.

As shown in fig. 1 and 9, all the components connected by the rotating shaft have relative rotation movement, so that the components form a relatively complex link mechanism. When the length of the locking device is not changed, the whole body cannot move, and when the length of the locking device is changed, the relative positions of all components of the connecting rod mechanism can be changed. When the adjustable telescopic rod is used, the adjusting rod 312 is rotated according to the direction indicated by the arrow on the adjusting rod 312, the adjusting rod 312 is connected with the pull wire 313, the pull wire passes through the pull wire bracket 34 and then is connected with the hydraulic spring 33, at the moment, the hydraulic spring 33 is in an open state, and the spring rod can be freely stretched. Wherein the wire drawing hole in the wire drawing bracket 34 is on the axis of the first rotating shaft 37, ensuring that the length of the hydraulic spring 33 in the telescopic wire drawing 313 does not need to be changed.

As shown in fig. 1 and fig. 9, when the human body leans back from the sitting posture to the lying posture, the adjusting rod 312 is rotated to open the control valve of the locking device, the back of the human body applies pressure to the backrest plate 51, the backrest plate rotates counterclockwise around the central rotation axis 39 as a center, the seat plate 41 is driven to move backward and the first supporting arm 35 is driven to move forward, at this time, the leg supporting plate 61 rotates counterclockwise due to the push-pull force of the seat plate 41 and the first supporting arm 35, and the extension rod of the hydraulic spring 33 and the extension rod of the self-locking gas spring are pulled out. Until the control valve of the locking device is closed to place the hydraulic spring 33 in a locked state or until the stop collar 310 reaches one end of the stop groove 14 of the base frame 1. On the contrary, when the human body changes from the lying posture to the sitting posture, the adjusting rod 312 is rotated to open the control valve of the locking device, and at this time, the seat plate 41 becomes the main stressed component, and under the action of the downward gravity of the user, the seat plate 41 moves downward and pulls the backrest plate 51 to rotate clockwise around the central rotating shaft 39, so as to drive the first supporting arm 35 to move backward. At this time, the leg rest 61 is pushed by the seat plate 41 and the inner support plate 35 against the lying posture, and rotates clockwise, and presses the extension bar of the hydraulic spring 33 into the hydraulic spring. Until the hydraulic spring 33 is in the locked state or the stopping sleeve 310 reaches the other end of the stopping groove 14 of the base frame 1.

The hydraulic spring has the characteristics of stability, safety and random telescopic length, so that the safety and comfort of users in the process are ensured.

In conclusion, the angle-adjustable movable seat can be moved, stably adjusted, safe and comfortable, is suitable for a large number of people, helps patients to complete detection quickly and comfortably, and is particularly suitable for limb magnetic resonance imaging. Compared with the existing fixed sickbed, the chair has the advantages of compact structure and flexible movement; especially when the environment of the magnetic resonance apparatus is small, the use with the user is more beneficial.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An angularly adjustable mobile seat comprising a base frame (1), a seat plate (41) and a back plate (51), characterized in that: the backrest plate (51) is hinged on the base frame (1); the rear end of the seat plate (41) is hinged on the backrest plate (51), and the front end is hinged with a leg supporting plate (61);

further comprising a first support arm (35) and a second support arm (31); one end of the first supporting arm (35) is hinged on the leg supporting plate (61), and the other end is hinged on the backrest plate (51); one end of the second supporting arm (31) is hinged on the seat board (41), and the other end is hinged on the base frame (1);

the base frame (1) comprises a support frame (11), a support arm (15) which is obliquely arranged from bottom to front and top is arranged at the rear end of the support frame (11), and the backrest plate (51), the first support arm (35) and the second support arm (31) are all hinged on the support arm (15);

when the backrest plate (51) rotates relative to the base frame (1), the seat plate (41) and the leg supporting plate (61) are driven to move together, and the sitting and lying of the seat are realized.

2. The angularly adjustable mobile seat according to claim 1, wherein: the backrest plate (51) is hinged with the base frame (1) through a central rotating shaft (39), the seat plate (41) is hinged with the backrest plate (51) through a seat plate rotating shaft (38), and the backrest plate (51) is hinged with the first supporting arm (35) through a first rotating shaft (37); wherein the seat plate rotation shaft (38) and the first rotation shaft (37) are located on the upper side and the lower side of the central rotation shaft (39), respectively.

3. The angularly adjustable mobile seat according to claim 1, wherein: the locking device is arranged between the seat plate (41) and the leg supporting plate (61), or between the seat plate (41) and the back plate (51), or between the first supporting arm (35) and the leg supporting plate (61), or between the back plate (51) and the first supporting arm (35); the locking device has a locking braking function.

4. The angularly adjustable mobile seat according to claim 3, wherein: the locking device is a hydraulic spring (33) or a self-locking type gas spring which is arranged between the seat plate (41) and the leg supporting plate (61).

5. The angularly adjustable mobile seat according to claim 3, wherein: the number of the locking devices is two, one of the two locking devices is a hydraulic spring (33), and the other locking device is a self-locking type gas spring.

6. The angularly adjustable mobile seat according to claim 3, wherein: the seat plate (41) is provided with an adjusting rod (312) which is rotatably arranged, and the adjusting rod (312) is connected with a control switch of the locking device through a pull wire (313); the adjusting rod (312) is rotated, and a control switch of the locking device can be opened or closed through a pull wire (313).

7. The angularly adjustable mobile seat according to claim 1, wherein: the backrest plate (51) is provided with a limiting sleeve (310), the base frame (1) is provided with a limiting groove (14), and the limiting sleeve (310) is arranged in the limiting groove (14).

8. The angularly adjustable mobile seat according to claim 1, wherein: two front roller supporting plates (12) arranged at intervals are installed at the front end of the supporting frame (11), two rear roller supporting plates (13) arranged at intervals are installed at the rear end of the supporting frame, and rollers are installed on the front roller supporting plates (12) and the rear roller supporting plates (13).

9. The angularly adjustable mobile seat according to claim 1, wherein: the seat plate (41), the leg supporting plate (61) and the second supporting arm (31) are hinged together through a leg supporting plate rotating shaft (36), and the leg supporting plate rotating shaft (36) is located at the upper position of the leg supporting plate (61).

10. The angularly adjustable mobile seat according to claim 1, wherein: the mobile seat further comprises a seat pan assembly (4) and two armrests (71); the seat plate assembly (4) comprises a seat plate (41), a seat plate shell (42) and a seat cushion (43), the seat cushion (43) is installed on the seat plate (41), and the seat plate (41) and the seat cushion (43) are located on the inner side of the seat plate shell (42);

the two handrails (71) are both arranged on the base frame (1); the two handrails (71) are respectively positioned at the two side parts of the seat board (41);

the first supporting arm (35) and the second supporting arm (31) are arranged on the lower side of the seat plate (41), and the hinged position of the second supporting arm (31) and the seat plate (41) is located at the front end part of the seat plate (41).