Flexible and reliable heavy-load medical trolley

Abstract

The invention provides a flexible and reliable heavy-load medical trolley which comprises a trolley body, a handle, trundles, a steering mechanism, a brake mechanism and a stable lifting mechanism. The steering mechanism adopts a gear-chain transmission system, all the trundles of the trolley are synchronously controlled to steer synchronously through steering of a hand control handle, and the steering control precision and synchronism of the multiple trundles of the medical trolley are improved; the brake mechanism adopts a connecting rod transmission system, the brake assembly is controlled to move up and down and rub with the ground for braking by stepping on a pedal, the operation action is simple and labor-saving, the trundles are effectively protected from being damaged, and the medical trolley is enabled to start, stop and brake quickly and safely in a labor-saving manner; the stable lifting mechanism is used for controlling the medical trolley to stably load equipment and controlling the equipment to lift; the above structures cooperate to jointly improve the control precision of the heavy-load medical trolley, reduce the control difficulty of the heavy-load medical trolley, and improve the moving flexibility, precision and reliability of the heavy-load medical trolley.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a flexible and reliable heavy-duty medical trolley. BACKGROUND

[0002] With the iteration of medical device technology, many large devices can be miniaturized and integrated into medical trolleys, which can facilitate corresponding examinations of patients and rapid viewing of medical images in cooperation with display devices. Heavy-duty devices combined with medical trolleys form medical instrument trolleys with different functions, the main purpose of which is to improve flexibility, so that devices that are not convenient to move can be quickly and conveniently moved, improving the convenience of medical operations and medical efficiency. However, while moving flexibly, the stability and reliability of use also need to be ensured.

[0003] The application scenarios and loads of medical trolleys in use are different from those in other fields, so different needs may arise depending on the actual situation. Some medical devices installed on the trolley need to be adjusted in height, but the size and weight of different devices are not the same. For example, mobile C-shaped arms and other medical trolleys, which have large loads and heavy weights, and most of the components are located at the front end of the trolley, causing the center of gravity of the device to easily shift. Therefore, the reliability of the lifting system of the trolley needs to be improved to make it suitable for most heavy medical devices. The movement of the medical trolley relies on the casters at the bottom of the trolley, and the flexibility of the movement relies on the steering mechanism of the casters. The heavy load medical device itself has large inertia, making it difficult to control the direction and rotation angle of the casters, resulting in poor accuracy of the trolley steering, especially when turning 90° on the corridor, which is prone to bumping. In addition, the angular inertia of the heavy load medical trolley itself also increases the difficulty of braking, and directly braking the casters, especially in emergency braking, can cause significant structural damage to the casters. Moreover, when there are a large number of casters, the failure of one or more caster braking mechanisms can easily cause brake failure or the inability to restart after braking. In view of the above technical problems, a flexible and reliable heavy-duty medical trolley is needed. SUMMARY

[0004] The purpose of the present application is to improve the structure of the medical trolley to solve the problem of heavy load medical trolley moving due to large self-weight and large inertia, resulting in inflexible and inaccurate steering, easy bumping, and difficult braking, easy damage to the casters, and easy failure when there are many casters.

[0005] To solve the above problems, the present application provides a flexible and reliable heavy-duty medical trolley, which comprises a trolley body, a handle, casters, a steering mechanism, and a brake mechanism. The steering mechanism is used to control the steering of the trolley body, and the brake mechanism is used to control the start and stop of the brake of the medical trolley, improving the control accuracy of the heavy-duty medical trolley, reducing the control difficulty of the heavy-duty medical trolley, and improving the mobility flexibility and safety of the heavy-duty medical trolley.

[0006] The rear end top of the body is provided with the handle, and the front end bottom of the body is provided with a castor, the steering mechanism comprises a steering connecting rod and a chain wheel transmission assembly, one end of the steering connecting rod is connected to the bottom end of the handle, the other end of the steering connecting rod is connected to the chain wheel transmission assembly, and the chain wheel transmission assembly is located on the chassis of the body and connected with the steering shaft of the castor; the handle is rotated to drive the steering connecting rod to rotate synchronously, and the steering connecting rod drives the castor to rotate synchronously through the chain wheel transmission assembly.

[0007] The operator directly controls the heavy-duty medical trolley to steer through hand action, the handle is located at the top end of the body, the steering mechanism is located at the bottom end of the body, the handle and the steering mechanism are connected and synchronously moved through the steering connecting rod, the synchronous steering between the handle and the castor is realized through the meshing transmission of the gear and the chain, and the steering angle of the handle is accurately transmitted through the gear and controls the castor to rotate by the same angle.

[0008] The chassis of the body is provided with the brake mechanism, the brake mechanism comprises a brake assembly, a transmission locking assembly, a reset assembly, a brake connecting rod and a pedal, the brake assembly is connected with the transmission locking assembly, the transmission locking assembly is connected with the reset assembly, the pedal is installed on the side of the chassis of the body, and the pedal is connected with the transmission locking assembly through the brake connecting rod; the pedal is stepped clockwise / counterclockwise to drive the brake connecting rod to rotate clockwise / counterclockwise, and the transmission locking assembly moves up / down on the brake assembly with the clockwise / counterclockwise rotation of the brake connecting rod; when the brake assembly moves down to rub against the ground for friction braking, the medical trolley is braked; when the brake assembly moves up to be separated from the ground without friction, the medical trolley is unbraked; when the medical trolley is braked and locked, the transmission locking assembly moves to the locked state, and the reset assembly stores energy; when the medical trolley is unbraked, the reset assembly releases energy to drive the transmission locking assembly to the unblocked state.

[0009] The operator controls the heavy-duty medical trolley to start and stop braking through the brake mechanism by foot action, steps on the pedal forward and backward, drives the transmission locking assembly through the brake connecting rod, and then drives the brake assembly to perform the braking or unlocking action. The brake assembly directly moves up and down, realizes braking through friction with the ground, and does not directly act on the castor, so as to not cause damage to the surface of the castor or parts of the castor, especially the heavy-duty medical trolley, the pressure borne by the castor is greater, the friction and wear between the castor and the ground are greater during movement, steering and braking, and therefore the protection effect of the brake mechanism with the above structure on the castor is more obvious.

[0010] The operator operates the heavy-duty medical trolley to turn by hand action and operates the heavy-duty medical trolley to start and stop brake by foot action, and the operation action and the execution component are not interfered with each other, the action execution error is effectively avoided, and the trolley control accuracy is improved.

[0011] In a possible implementation, the sprocket transmission assembly comprises a driving gear, a driven gear, a transmission chain, and a guide gear, the driving gear is coaxially installed at the bottom end of the steering connecting rod and synchronously rotates with the steering connecting rod, the driven gear is coaxially installed with the caster in one-to-one correspondence, the driving gear and the driven gear are connected through the transmission chain, the driven gear synchronously rotates with the driving gear and drives the corresponding caster to synchronously turn, and the guide gear is installed outside the transmission chain and is used to change the running route of the transmission chain to avoid the main body and components thereon.

[0012] In a possible implementation, the upper and lower ends of the steering connecting rod are sleeved with shafts and are rotationally connected with the main body.

[0013] In a possible implementation, the brake assembly comprises a brake shell, a brake member, and a brake disc, the brake shell penetrates through the chassis of the main body and is fixedly installed, the brake shell is internally provided with a vertically extending accommodating cavity, the brake shell is provided with a vertically extending operation opening in the side surface, the brake member is accommodated in the accommodating cavity of the brake shell, the transmission locking assembly enters the brake shell through the operation opening and is connected to the brake member to control the brake member to move up and down in the accommodating cavity, the brake disc is fixedly connected to the bottom end of the brake member and is located below the main body, the brake disc moves up and down with the brake member, and the brake disc moves downward to rub against the ground for friction braking.

[0014] In a possible implementation, the transmission locking assembly comprises a straight handle connecting rod, a crank connecting rod, and a transmission guide plate, the straight handle connecting rod comprises opposite A and B ends, the crank connecting rod is a “>”-shaped connecting rod with a bending angle, the crank connecting rod comprises C and D ends at two ends and a B’ end formed by the middle bending angle, the transmission guide plate is provided with an arc-shaped sliding groove, the A end is rotationally connected to the top end of the brake shell, the B end is rotationally connected to the B’ end, the C end is connected to the top end of the brake member, the D end is connected to the arc-shaped sliding groove of the transmission guide plate, and the bottom end of the transmission guide plate is connected to the brake connecting rod; the transmission guide plate synchronously rotates with the brake connecting rod, and the crank connecting rod slides in the arc-shaped sliding groove with the rotation of the transmission guide plate.

[0015] In a possible implementation manner, the A end of the straight handle connecting rod is connected with the C end of the crank connecting rod to form a straight line with a fixed position, when the D end of the crank connecting rod moves upward in the arc-shaped sliding groove, the joint point between the B end of the straight handle connecting rod and the B' end of the crank connecting rod moves towards the direction close to the brake housing, until the joint point between the B end and the B' end crosses the straight line formed by the connection between the A end and the C end, which is the locking state; when the D end of the crank connecting rod moves downward in the arc-shaped sliding groove, the joint point between the B end of the straight handle connecting rod and the B' end of the crank connecting rod moves away from the direction close to the brake housing, until the joint point between the B end and the B' end crosses the straight line formed by the connection between the A end and the C end, which is the unlocking state.

[0016] In a possible implementation manner, the reset assembly comprises a reset tension spring and a moving guide column, the moving guide column is fixedly installed on the chassis of the vehicle body, one end of the reset tension spring is connected to the top end of the transmission guide plate, and the other end of the reset tension spring is connected to the moving guide column and slides on the moving guide column.

[0017] In a possible implementation manner, the vehicle body is provided with a set of brake mechanisms on the left side and the right side respectively, the pedals of the two sets of brake mechanisms are arranged on the left side and the right side outside the chassis of the vehicle body respectively, and the two sets of brake mechanisms share one brake connecting rod; when the pedal on any side is stepped on, the two sets of brake mechanisms are synchronously braked or unbraked.

[0018] In a possible implementation manner, the vehicle body is further provided with a stable lifting mechanism, the stable lifting mechanism comprises a lifting housing, lifting rails, lifting sliding blocks, a lifting column, a fixed cross rod and an electric push rod, the lifting housing is installed at the front end of the vehicle body and has a hollow structure, the number of the lifting rails is two, and the two lifting rails are vertically arranged on the opposite inner side walls of the lifting housing respectively, the lifting column is located in the interior of the lifting housing, the lifting sliding blocks are respectively installed on the opposite outer side walls of the lifting column, the lifting sliding blocks are slidably installed in one-to-one correspondence with the lifting rails, the electric push rod is installed in the interior of the lifting column, the fixed cross rod is installed at the top end of the lifting column, the extension end of the electric push rod is connected to the fixed cross rod, and the electric push rod drives the lifting column to move up and down in the lifting housing through the fixed cross rod.

[0019] In a possible implementation manner, the bottom of the lifting column is provided with a counterweight.

[0020] Compared with the prior art, the present application has the following beneficial effects: 1. The steering mechanism adopts a gear-chain transmission system, and realizes 1:1 power transmission through rigid engagement, which can effectively reduce the steering angle deviation, and multiple casters are controlled by multiple gears under the same chain, so that the multi-caster synchronous steering error can be controlled within ±1°, which is especially suitable for heavy and precise medical equipment such as C-arm medical trolley moving demand; The structure of the steering mechanism is simple and convenient to install, and by increasing or decreasing the number and position of gears, it can easily adapt to different models of medical trolleys; 2. The brake mechanism adopts a connecting rod transmission system, and realizes the up-down movement of the brake assembly and the friction braking with the ground through the multi-connecting rod force amplification mechanism, which is simple and labor-saving in operation, short in braking time and direct in braking effect; In addition, through the friction braking between the brake assembly and the ground, it will not cause damage to the surface of the caster or the parts of the caster, and it will protect the caster; 3. The steering of the medical trolley is realized by rotating the handle with the hands of the operator, and the brake of the medical trolley is realized by stepping on the pedal with the feet of the operator, and the operation of the two does not interfere with each other, avoiding the problem of operation error in confusion; and the steering mechanism is directly connected to the caster and drives the caster to steer, and the brake mechanism does not act on the caster, and the parts of the transmission and execution of the two do not interfere with each other, so that the operation precision is higher, and the fault tolerance is also higher, even if the operation is wrong, it will not cause damage to the medical trolley; 4. The main parts of the steering mechanism and the brake mechanism of the medical trolley are arranged on the chassis at the bottom of the vehicle body, which increases the counterweight at the bottom of the vehicle body, and for heavy medical trolleys, especially C-arm medical trolleys with large volume and easily changed vehicle body gravity center installation position, it can improve the stability of operation and walking, improve the safety in use, and protect the medical equipment carried thereby. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 It is a schematic diagram of the overall structure of a flexible and reliable heavy-duty medical trolley; Figure 2 It is a schematic diagram of the installation structure of the steering mechanism; Figure 3 It is a schematic diagram of the state of the brake mechanism in the non-braking state; Figure 4 It is a schematic diagram of the state of the brake mechanism in the braking state; Figure 5It is the internal structure schematic diagram of brake mechanism in brake state; Figure 6 It is the overall structure schematic diagram of stable lifting mechanism; Figure 7 It is the structure schematic diagram of sliding connection between lifting shell and lifting column of stable lifting mechanism; Figure 8 It is the internal structure schematic diagram of lifting column of stable lifting mechanism.

[0023] Among them, the vehicle body main body 1, chassis 11; handle 2, caster 3; Steering mechanism 4, steering connecting rod 41, chain wheel transmission assembly 42, driving gear 421, driven gear 422, transmission chain 423, guide gear 424; Brake mechanism 5, brake assembly 51, transmission locking assembly 52, reset assembly 53, brake connecting rod 54, pedal 55, brake shell 511, brake piece 512, brake disc 513, containing cavity 5111, operation port 5112, straight handle connecting rod 521, crank connecting rod 522, transmission guide plate 523; arc-shaped sliding groove 5231; Stable lifting mechanism 6, lifting shell 61, lifting track 62, lifting sliding block 63, lifting column 64, fixed cross rod 65, electric push rod 66. DETAILED DESCRIPTION

[0024] In order to make the purpose, structure, characteristics and functions of the present application have further understanding, this part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as the limitation of the protection scope of the present application.

[0025] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "middle", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. If it is described as "first", "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features or implying the sequence of indicated technical features.

[0026] In the description of the present application, unless otherwise explicitly defined, the words "set", "install", "connect" and the like should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0027] Reference Figure 1 The present application provides a flexible and reliable heavy-duty medical trolley, comprising a trolley body 1, a handle 2, a caster 3, a steering mechanism 4, and a brake mechanism 5. In combination with the common structure of the medical trolley, the steering mechanism 4 and the brake mechanism 5 are designed to control the heavy-duty medical trolley to realize more flexible, accurate, safe and fast steering and braking, improve the control operation comfort and accuracy of the heavy-duty medical trolley, prolong the service life of the medical trolley, and better protect the medical equipment carried on the medical trolley. The medical trolley referred to in the present application includes all models and structures of medical trolleys in the current medical instrument field, including the trolley body, the handle 2 and the caster 3, and should not be limited.

[0028] Reference Figures 1-2 The rear end top of the trolley body 1 is provided with the handle 2, and the front end bottom of the trolley body 1 is provided with the caster 3. The steering mechanism 4 comprises a steering connecting rod 41 and a chain wheel transmission assembly 42. One end of the steering connecting rod 41 is connected to the bottom end of the handle 2, and the other end of the steering connecting rod 41 is connected to the chain wheel transmission assembly 42. The chain wheel transmission assembly is located on the chassis 11 of the trolley body 1 and is connected with the steering shaft of the caster 3. The handle 2 is rotated to drive the steering connecting rod 41 to rotate synchronously, and the steering connecting rod 41 drives the caster 3 to rotate synchronously through the chain wheel transmission assembly 42.

[0029] The above structure is used to control the medical trolley to realize steering operation. The specific operation method is as follows: the operator holds the handle 2 and rotates the handle 2 by force, which can control the caster 3 to rotate synchronously and in the same direction, thereby realizing the overall steering of the medical trolley. The principle of steering is as follows: a gear-chain transmission system is used, i.e. the chain wheel transmission assembly 42 transmission. When the handle 2 is rotated, the steering connecting rod 41 connected with the handle 2 rotates synchronously, and the chain wheel transmission assembly 42 is connected with the steering connecting rod 41 at one end and directly connected with the steering shaft of the caster 3 at the other end. Therefore, through the transmission of the chain wheel transmission assembly 42, the caster 3 and the handle 2 can be controlled to rotate synchronously and in the same direction, thereby realizing the steering of the medical trolley. The chain wheel transmission steering can realize better transmission ratio and precise caster 3 steering angle control, and can realize synchronous high-precision steering of multiple casters 3 of the same medical trolley, solving the problem of large steering error of each caster 3.

[0030] In some embodiments, reference Figure 2The sprocket transmission assembly 42 comprises a driving sprocket 421, a driven sprocket 422, a transmission chain 423, and a guide sprocket 424. The driving sprocket 421 is coaxially installed at the bottom end of the steering connecting rod 41 and rotates synchronously with the steering connecting rod 41. The driven sprocket 422 is coaxially installed with the caster 3 one by one. The driving sprocket 421 is connected with the driven sprocket 422 through the transmission chain 423. The driven sprocket 422 rotates synchronously with the driving sprocket 421 and drives the corresponding caster 3 to rotate synchronously. The guide sprocket 424 is installed outside the transmission chain 423 and changes the route of the transmission chain 423 to avoid the main body 1 and components thereon.

[0031] In this embodiment, the steering mechanism 4 is described with reference to Figure 2 The driving sprocket 421 is directly connected with the steering connecting rod 41 to realize 1:1 synchronous and same-direction rotation with the handle 2. The driving sprocket 421 drives the driven sprocket 422 and the guide sprocket 424 to rotate through the transmission chain 423. The driven sprocket 422 is coaxially connected with the steering shaft of the caster 3, so that the caster 3 rotates synchronously with the driven sprocket 422 to realize steering. Since the shapes, structures, and component distributions on the chassis 11 of medical trolleys of different models are different, the guide sprocket 424 outside the sprocket can change the shape and transmission trajectory of the sprocket to improve the adaptability of the steering mechanism 4. All the sprockets are installed on a transmission sprocket. The casters 3 of the same model are matched with the sprockets of the same model, so that synchronous transmission is truly realized. All the casters 3 rotate synchronously and the steering angle error is controlled within ±1°. The number of driven sprockets 422 is equal to the number of casters 3 controlled to steer. For example Figure 1 The number of casters 3 in the medical trolley is 2, and the number of driven sprockets 422 is also 2. The front two wheels are auxiliary front wheels, which have high control cost and poor effect, so they do not need to be controlled by the driven sprocket 422.

[0032] Optionally, the model of the driven sprocket 422 can be selected according to actual needs, so that the steering transmission ratio of the sprocket-chain is controlled in the range of 1:1 to 1:2.5 as needed. When the steering transmission ratio of the sprocket-chain is 1:1, the angle of rotation of the handle 2 is equal to the angle of rotation of the caster 3, and the operator can more directly and accurately control the steering of the medical trolley.

[0033] Optionally, in order to improve the adaptability of the steering mechanism 4 under complex working conditions, the transmission chain 423 adopts a sealed roller chain design, and is matched with a waterproof bearing, so that the steering mechanism 4 can still maintain a transmission efficiency of more than 90% in the environment of spraying disinfectant in medical applications.

[0034] In some embodiments, the upper and lower ends of the steering connecting rod 41 are sleeved with shafts and are rotationally connected with the main body 1. The shafts reduce the friction between the steering connecting rod 41 and the main body 1, so that the steering operation is more labor-saving and more accurate.

[0035] Reference Figure 1 、 Figures 3-5 The brake mechanism 5 is arranged at the chassis 11 of the body 1, and includes a brake assembly 51, a transmission locking assembly 52, a reset assembly 53, a brake connecting rod 54, and a pedal 55. The brake assembly 51 is connected with the transmission locking assembly 52, the transmission locking assembly 52 is connected with the reset assembly 53, the pedal 55 is installed on the side of the chassis 11 of the body 1, and the pedal 55 is connected with the transmission locking assembly 52 through the brake connecting rod 54. The pedal 55 is pressed clockwise / counterclockwise to drive the brake connecting rod 54 to rotate clockwise / counterclockwise, and the transmission locking assembly 52 moves up / down on the brake assembly 51 according to the clockwise / counterclockwise rotation of the brake connecting rod 54. When the brake assembly 51 moves down to rub against the ground, the medical trolley is braked. When the brake assembly 51 moves up to be separated from the ground, the medical trolley is unbraked. When the medical trolley is braked and locked, the transmission locking assembly 52 moves to the locked state, and the reset assembly 53 stores energy. When the medical trolley is unbraked, the reset assembly 53 releases energy to drive the transmission locking assembly 52 to the unblocked state.

[0036] The above structure is used to control the medical trolley to realize the braking / unlocking operation. The specific operation method is that the operator presses the pedal 55 forward and backward to realize the unlocking / braking of the medical trolley and the state locking after the brake braking. The steering principle is that the pedal 55 is pressed forward and backward to drive the brake connecting rod 54 to rotate clockwise / counterclockwise, the transmission locking assembly 52 fixedly connected with the brake connecting rod 54 rotates synchronously, and the brake assembly 51 moves up / down. When the brake assembly 51 moves up, it is separated from the ground, and the medical trolley is in the unlocked state. When the brake assembly 51 moves down, it is in contact with the ground and continuously increases the friction, and the medical trolley is in the brake state. The reset assembly 53 is connected with the transmission locking assembly 52, stores energy when the brake is locked, and releases energy to assist the unlocking of the medical trolley when the pedal 55 is pressed to unlock. The brake and unlocking of the medical trolley can be realized by the simple action of stepping on the pedal 55, and the reset assembly 53 can assist the unlocking, so that the operation process is convenient and labor-saving. The entire brake mechanism 5 is completely irrelevant to the casters 3, and relies on the friction between the brake assembly 51 and the ground, so it will not damage the casters 3. Especially for heavy medical trolleys, the inertia is usually large, and some brake pads acting on the casters 3 will cause great wear to the casters 3 and themselves.

[0037] The operator operates the heavy-duty medical trolley to turn by hand action and operates the heavy-duty medical trolley to start and stop the brake by foot action. Both the operation action and the execution component do not interfere with each other, effectively avoiding the situation of action execution error, improving the control accuracy of the trolley, and the main components of the turning mechanism 4 and the brake mechanism 5 are arranged on the chassis 11 at the bottom of the trolley body, increasing the counterweight at the bottom of the trolley body. For heavy-duty medical trolleys, especially C-shaped arms and other medical trolleys with large volume and easily changed trolley body gravity center installation position, the stability of operation and walking can be improved, the use safety can be improved, and the medical equipment carried thereby can be protected.

[0038] In some embodiments, the brake assembly 51 includes a brake housing 511, a brake piece 512, and a brake disc 513. The brake housing 511 passes through the chassis 11 of the trolley body 1 and is fixedly installed. The brake housing 511 is internally provided with a vertically extending accommodating cavity 5111. The brake housing 511 is provided with a vertically extending operation port 5112 on the side surface. The brake piece 512 is accommodated in the accommodating cavity 5111 of the brake housing 511. The transmission locking assembly 52 enters the brake housing 511 through the operation port 5112 and is connected to the brake piece 512 and controls the brake piece 512 to move up and down in the accommodating cavity 5111. The brake disc 513 is fixedly connected to the bottom end of the brake piece 512 and located below the trolley body 1. The brake disc 513 moves up and down with the brake piece 512. The brake disc 513 moves downward to rub against the ground for friction braking.

[0039] In this embodiment, the brake housing 511 plays a guiding, limiting and protecting role, so that the brake piece 512 and the brake disc 513 inside it move smoothly up and down along the axis of the brake housing 511, avoiding damage caused by collision of these components with the trolley body base or affecting the continuity of the brake action, affecting the brake / unlocking effect. The brake housing 511 can be a cylindrical body that penetrates up and down. The top end of the brake piece 512 is connected to the transmission locking assembly 52 and moves up and down under the drive of the transmission locking assembly 52. The brake piece 512 moves up and down in the brake housing 511, and its movement trajectory is constrained, which can ensure that the brake disc 513 moves straight up and down, thereby making the brake disc 513 have better friction braking effect.

[0040] In addition to high friction performance and wear resistance, the brake mechanism 5 of the heavy-duty medical trolley also needs to consider the medical application environment, environmental adaptability and medical scene compliance. In some embodiments, the brake chassis 11 can be made of a material with high friction coefficient, such as ceramic composite material as the main friction surface. Specifically, Al2O3-SiC-C fiber reinforced ceramic can be selected. More preferably, the brake chassis 11 is designed as a multi-layer structure, a buffer transition layer of metal matrix composite material is arranged above the ceramic composite brake disc 513, specifically, copper-based powder metallurgy can be selected. A support structure back plate is arranged above the buffer transition layer, which can be made of a polymer substrate, such as polyether ether ketone (PEEK) plus carbon fiber material. A constraint layer damping sheet is attached to the back of the brake chassis 11, which can be made of 3M ISD112 material to reduce noise and better adapt to hospital environments.

[0041] Further, the brake chassis 11 is divided into multiple independent modules, and there is a gap of 1-2 mm between adjacent modules to allow independent thermal expansion of each brake module to adapt to temperature differences in different medical environments, such as lower temperatures in operating rooms, which aims to reduce deformation and brake noise.

[0042] Further, a fluorescent warning strip is embedded in the bottom of the brake chassis 11, which is embedded in the bottom of the brake disc 513 and can be used as a failure protection design. When the brake disc 513 wears to a certain extent, the fluorescent warning strip is exposed, indicating that the wear of the brake chassis 11 has reached the limit.

[0043] In some embodiments, the transmission locking assembly 52 includes a straight handle connecting rod 521, a crank connecting rod 522, and a transmission guide plate 523. The straight handle connecting rod 521 includes opposite A and B ends. The crank connecting rod 522 is a “>” shaped connecting rod with a bending angle. The crank connecting rod 522 includes C and D ends at both ends and a B' end formed by the middle bending angle. The transmission guide plate 523 is provided with an arc-shaped sliding groove 5231. The A end is rotatably connected to the top end of the brake housing 511. The B end is rotatably connected to the B' end. The C end is connected to the top end of the brake piece 512. The D end is connected to the arc-shaped sliding groove 5231 of the transmission guide plate 523. The bottom end of the transmission guide plate 523 is connected to the brake connecting rod 54. The transmission guide plate 523 rotates synchronously with the brake connecting rod 54. The crank connecting rod 522 slides in the arc-shaped sliding groove 5231 with the rotation of the transmission guide plate 523.

[0044] In this embodiment, the transmission locking assembly 52 utilizes a crank rocker mechanism, a four-link force amplification mechanism composed of the brake connecting rod 54, the transmission guide plate 523, the crank connecting rod 522, and the straight handle connecting rod 521. When the pedal 55 is stepped on, the brake connecting rod 54 is rotated, which drives the transmission guide plate 523 to rotate. The rotation of the transmission guide plate 523 moves the D end of the crank connecting rod 522 in the arc-shaped sliding groove 5231 of the transmission guide plate 523. The bending inflection point of the crank connecting rod 522 is connected and cooperates with the straight handle connecting rod 521 to move the C end of the crank connecting rod 522 up and down. The rotational movement of the brake connecting rod 54 around its own axis is converted into the linear up-and-down movement of the C end of the crank connecting rod 522, thereby driving the brake assembly 51 to move linearly up and down, realizing the unlocking / braking operation. Not only can it easily change direction, but also can save the physical strength of the operator, without the need for large-scale foot movements, which is convenient for the operator to operate. Each time the pedal 55 is stepped on, the brake mechanism 5 can be easily moved up and down and locked, avoiding the situation that the brake is not in place or the unlocking is not in place, improving the braking reliability, and making it more safe to use for heavy-duty medical trolleys.

[0045] In some further embodiments, the A end of the straight handle connecting rod 521 is connected to the C end of the crank connecting rod 522 to form a straight line with a fixed position. When the D end of the crank connecting rod 522 moves up in the arc-shaped sliding groove 5231, the B end of the straight handle connecting rod 521 moves away from the brake housing 511 until the connecting point of the B end and the B' end of the crank connecting rod 522 crosses the straight line formed by the connection of the A end and the C end, which is the locking state. When the D end of the crank connecting rod 522 moves down in the arc-shaped sliding groove 5231, the B end of the straight handle connecting rod 521 moves away from the brake housing 511 until the connecting point of the B end and the B' end of the crank connecting rod 522 crosses the straight line formed by the connection of the A end and the C end, which is the unlocking state. The straight handle connecting rod 521, the crank connecting rod 522, the transmission guide plate 523, and the brake connecting rod 54 form a four-link force amplification mechanism, which realizes the transmission, reversing, and range amplification of force between the pedal 55 and the brake assembly. At the same time, the four-link force amplification mechanism itself is used to lock / unlock the brake state by whether the B' end of the crank connecting rod 522 crosses the straight line formed by the connection of the A end and the C end during the transmission process, without the need for additional components, which is simple in structure and low in failure rate, ensuring the safety and reliability of the brake of the heavy-duty medical trolley.

[0046] In some embodiments, the reset assembly 53 comprises a reset tension spring 531 and a moving guide column 532 fixedly installed on the chassis 11 of the vehicle body 1, one end of the reset tension spring 531 is connected to the top end of the transmission guide plate 523, and the other end of the reset tension spring 531 is connected to the moving guide column 532 and slides on the moving guide column 532. The function of the reset assembly 53 is to assist in releasing the brake, and the reset tension spring 531 is used to store and release energy. Since one end of the reset tension spring 531 is connected to the top end of the transmission guide plate 523, and the top end of the transmission guide plate 523 rotates with the rotation of the brake connecting rod 54, and the rotation stroke is greater than that of the brake connecting rod 54, the end of the reset tension spring 531 connected to the transmission guide plate 523 also moves greatly. The other end of the reset tension spring 531 can move on the moving guide column 532, which is used to offset the large movement of the end of the reset tension spring 531, so that the reset tension spring 531 can adaptively change its posture and always maintain the optimal force application and stress direction, avoiding the twisting and breaking of the tension spring during movement and stretching.

[0047] In some further embodiments, a sleeve ring is sleeved on the moving guide column 532, and one end of the reset tension spring 531 is connected to the sleeve ring, which facilitates the reset tension spring 531 to adjust its posture more easily.

[0048] In some embodiments, the vehicle body 1 is provided with a set of brake mechanisms 5 on the left and right sides, respectively, the pedals 55 of the two sets of brake mechanisms 5 are arranged on the left and right sides outside the chassis 11 of the vehicle body 1, and the two sets of brake mechanisms 5 share one brake connecting rod 54. When stepping on the pedal 55 of either side, the two sets of brake mechanisms 5 are synchronized to brake or release the brake. Each medical trolley is provided with two sets of brake mechanisms 5 symmetrically arranged on the left and right sides of the vehicle body 1, and the two sets of brake mechanisms 5 share one brake connecting rod 54, so that when stepping on the pedal 55 of either side, the brake mechanisms 5 on both sides are synchronized to work, which can double the braking effect.

[0049] Reference Figure 1 , Figures 6-8In some embodiments, the body main body 1 is also provided with a stable lifting mechanism 6, which comprises a lifting shell 61, a lifting rail 62, a lifting slider 63, a lifting column 64, a fixed crossbar 65 and an electric push rod 66; the lifting shell 61 is installed at the front end of the body main body 1 and has a hollow structure, the number of lifting rails 62 is two and they are vertically arranged on the opposite two inner side walls of the lifting shell 61, the lifting column 64 is located inside the lifting shell 61, the lifting sliders 63 are respectively installed on the opposite two outer side walls of the lifting column 64, the lifting sliders 63 are slidingly installed corresponding to the lifting rails 62, the electric push rod 66 is installed inside the lifting column 64, the fixed crossbar 65 is installed at the top end of the lifting column 64, and the telescopic end of the electric push rod 66 is connected to the fixed crossbar 65, so that the electric push rod 66 drives the lifting column 64 to move up and down in the lifting shell 61 through the fixed crossbar 65.

[0050] In this embodiment, the stable lifting mechanism 6 adopts a double-layer sleeve lifting structure, the lifting column 64 moves up and down in the lifting shell 61, the lifting column 64 and the lifting shell 61 are slidingly lifted through the cooperation of the lifting rails 62 and the lifting sliders 63, and the electric push rod 66 for driving the lifting column 64 is located inside the lifting column 64. By using the double-layer structure to separately arrange the different components inside and outside, the structure of each layer is simpler and the failure rate is reduced. The lifting rails 62 and the lifting sliders 63 not only assist the lifting column 64 to lift, but also play a guiding and righting role, avoiding the shaking of the lifting column 64 during lifting, so as to affect the use of the medical equipment installed on the upper end thereof.

[0051] Preferably, the lifting rails 62 and the lifting sliders 63 are located on the left and right sides of the outside of the lifting column 64, the fixed crossbar 65 is located inside the lifting column 64 and is fixed on the front and rear two side walls thereof, and the fixed crossbar 65 connects the two fixed side faces and the two side faces on which the lifting sliders 63 are installed, which are perpendicular to each other, thereby being more conducive to lifting stability.

[0052] In a further embodiment, the bottom end of the lifting column 64 is provided with a counterweight, which can avoid the medical trolley being excessively head-heavy or front-heavy, thereby improving the stability of the medical trolley. A buffer device such as a spring assembly, a buffer silica gel pad or the like can also be arranged at the bottom end and the top end of the lifting column 64, thereby avoiding damage caused by improper operation or fault of the lifting column 64.

[0053] The heavy-load medical trolley provided by the present application integrates the steering mechanism 4 and the brake mechanism 5 on the chassis 11 of the body main body 1, does not interfere with each other and occupies a very small height space, which is very suitable for the modification of various types of medical trolleys at present and perfectly adapts to the DIN 583 medical equipment access standard.

[0054] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0055] The application has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the application, and are used to help understand the technical solutions and the core ideas of the application. It must be pointed out that the disclosed embodiments do not limit the scope of the application; on the contrary, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced by equivalents; the modifications and refinements made without departing from the spirit and scope of the application all belong to the patent protection scope of the application.

Claims

1. A flexible and reliable heavy duty medical cart characterized by: It includes the vehicle body, handles, casters, steering mechanism, and brake mechanism; The handle is provided at the top of the rear end of the vehicle body, and a caster is provided at the bottom of the front end of the vehicle body. The steering mechanism includes a steering link and a sprocket transmission assembly. One end of the steering link is connected to the bottom end of the handle, and the other end of the steering link is connected to the sprocket transmission assembly. The sprocket transmission assembly is located on the chassis of the vehicle body and connected to the steering shaft of the caster. The rotation of the handle drives the steering link to rotate synchronously, and the steering link drives the caster to steer synchronously through the sprocket transmission assembly. The brake mechanism is provided at the chassis of the vehicle body, and the brake mechanism includes a brake assembly, a transmission locking assembly, a reset assembly, a brake link and a pedal, the brake assembly is connected to the transmission locking assembly, the transmission locking assembly is connected to the reset assembly, the pedal is installed on the side of the chassis of the vehicle body, and the pedal is connected to the transmission locking assembly through the brake link; the pedal is stepped on clockwise / counterclockwise to drive the brake link to rotate clockwise / counterclockwise, and the transmission locking assembly acts on the brake assembly to move up / down along with the clockwise / counterclockwise rotation of the brake link; when the brake assembly moves down to abut against the ground for friction braking, the medical trolley brakes; when the brake assembly moves up to be away from the ground and has no friction, the medical trolley releases the brakes; when the medical trolley brakes and locks, the transmission locking assembly moves to a locked state, and the reset assembly stores energy; when the brake of the medical trolley is released, the reset assembly releases energy to drive the transmission locking assembly to release the locked state.

2. The flexible and reliable heavy duty medical cart of claim 1, wherein: The sprocket transmission assembly includes a driving gear, a driven gear, a transmission chain, and a guide gear. The driving gear is coaxially installed at the bottom end of the steering link and rotates synchronously with the steering link. The driven gear is coaxially installed with the casters in a one-to-one correspondence. The driving gear and the driven gear are connected by a transmission chain. The driven gear rotates synchronously with the driving gear and drives the corresponding casters to turn synchronously. The guide gear is installed on the outside of the transmission chain and is used to change the direction of the transmission chain so that it avoids the vehicle body and the components thereon.

3. The flexible and reliable heavy duty medical cart of claim 2, wherein: The upper and lower ends of the steering link are connected to the vehicle body at the joints with rotating shafts.

4. The flexible and reliable heavy duty medical cart of claim 1, wherein: The brake assembly includes a brake housing, a brake member, and a brake disc. The brake housing passes through the chassis of the vehicle body and is fixedly installed. A vertically extending accommodating cavity is provided inside the brake housing. A vertically extending operating port is provided on the side of the brake housing. The brake member is accommodated in the accommodating cavity of the brake housing. The transmission locking assembly enters the brake housing through the operating port and is connected to the brake member to control the brake member to move up and down in the accommodating cavity. The brake disc is fixedly connected to the bottom end of the brake member and is located below the vehicle body. The brake disc moves up and down with the brake member. The brake disc moves down to rest against the ground for friction braking.

5. The flexible and reliable heavy duty medical cart of claim 4, wherein: The transmission locking assembly comprises a straight handle connecting rod, a crank connecting rod and a transmission guide plate, the straight handle connecting rod comprises opposite A end and B end, the crank connecting rod is a "> " shaped connecting rod with a bending angle, the crank connecting rod comprises C end and D end at two ends and B' end formed by the middle bending angle, the transmission guide plate is provided with an arc-shaped sliding groove, the A end is rotatably connected to the top end of the brake shell, the B end is rotatably connected to the B' end, the C end is connected to the top end of the brake piece, the D end is connected to the arc-shaped sliding groove of the transmission guide plate, and the bottom end of the transmission guide plate is connected to the brake connecting rod; the transmission guide plate rotates synchronously with the brake connecting rod, and the crank connecting rod slides in the arc-shaped sliding groove with the rotation of the transmission guide plate.

6. The flexible and reliable heavy duty medical cart of claim 5, wherein: The A end of the straight handle connecting rod and the C end of the crank connecting rod are connected to form a straight line with fixed position, when the D end of the crank connecting rod moves up in the arc-shaped sliding groove, the joint point of the B end of the straight handle connecting rod and the B' end of the crank connecting rod moves to the direction close to the brake shell until the joint point of the B end and the B' end crosses the straight line formed by the connection of the A end and the C end, which is the locking state; when the D end of the crank connecting rod moves down in the arc-shaped sliding groove, the joint point of the B end of the straight handle connecting rod and the B' end of the crank connecting rod moves to the direction away from the brake shell until the joint point of the B end and the B' end crosses the straight line formed by the connection of the A end and the C end, which is the unlocking state.

7. The flexible and reliable heavy duty medical cart of claim 6, wherein: The reset assembly comprises a reset tension spring and a moving guide column, the moving guide column is fixedly installed on the chassis of the vehicle body, one end of the reset tension spring is connected to the top end of the transmission guide plate, and the other end of the reset tension spring is connected to the moving guide column and slides on the moving guide column.

8. The flexible and reliable heavy duty medical cart of claim 1, wherein: The vehicle body is provided with a set of brake mechanism on the left and right sides, the pedals of the two sets of brake mechanisms are arranged on the left and right sides outside the chassis of the vehicle body, and the two sets of brake mechanisms share one brake connecting rod; when the pedal of any side is stepped on, the two sets of brake mechanisms brake or release the brake synchronously.

9. The flexible and reliable heavy duty medical cart of claim 1, wherein: The vehicle body is further provided with a stable lifting mechanism, the stable lifting mechanism comprises a lifting shell, lifting rails, lifting sliders, a lifting column, a fixed cross rod and an electric push rod, the lifting shell is installed at the front end of the vehicle body and has a hollow structure, the number of the lifting rails is two and the two lifting rails are vertically arranged on the opposite inner side walls of the lifting shell, the lifting column is located in the interior of the lifting shell, the lifting sliders are respectively installed on the opposite outer side walls of the lifting column, the lifting sliders are slidingly installed corresponding to the lifting rails, the electric push rod is installed in the interior of the lifting column, the fixed cross rod is installed at the top end of the lifting column, the extension end of the electric push rod is connected to the fixed cross rod, and the electric push rod drives the lifting column to move up and down in the lifting shell through the fixed cross rod.

10. The flexible and reliable heavy duty medical cart of claim 9, wherein: The bottom of the lifting column is provided with a counterweight.

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