Lifting device, mobile medical imaging device, and medical imaging device

Abstract

A lifting device, a mobile medical imaging device, and a medical imaging device are provided. The lifting device comprises a fixed column, a first transmission device, and a spring assembly coupled to the first transmission device. The lifting device further comprises a movable column in sliding connection with the fixed column and coupled to the first transmission device. The spring assembly is configured to support the movable column in a compressed state via the first transmission device.

Description

Technical Field

[0001] This disclosure relates to medical imaging technology, and more particularly to a lifting device and a medical imaging equipment. Background Technology

[0002] In medical imaging systems such as X-ray imaging systems, radiation from an X-ray source is directed at a subject, typically a patient in a medical diagnostic application. A portion of the radiation passes through the subject and impacts a detector, which is divided into a matrix of discrete elements (e.g., pixels). The detector elements are read out to generate an output signal based on the amount or intensity of radiation impacting each pixel region. This output signal can then be processed to produce a medical image that can be displayed for examination on the display device of the X-ray imaging system.

[0003] For overhead tube suspension (OTS) systems, a separate wall stand is typically required to mount the detector. To accommodate different imaging needs for varying heights and body parts, this wall stand usually needs to be over 2 meters high, a requirement that current wall stand heights cannot meet. Furthermore, current wall stand designs also have problems. First, there are limitations and requirements on the height of the scanning space. During the transportation of the imaging system, an excessively tall wall stand poses a significant challenge for packaging and transport, and also places high demands on its installation and maintenance. Besides OTS systems, ground-mounted imaging systems and mobile DR (mobile digital direct imaging) systems also use wall stands, and these systems face the same issues. Moreover, in mobile applications, medical staff sometimes need to move the imaging system closer to the patient for imaging. When moving the imaging system, an excessively tall wall stand can obstruct the line of sight, affecting the safety and efficiency of movement. Therefore, a height-adjustable wall stand is needed to replace the current fixed-height wall stand. Utility Model Content

[0004] A first aspect of this disclosure provides a lifting device, comprising: a fixed column including a first transmission device and a spring assembly coupled to the first transmission device; and a movable column slidably connected to the fixed column and coupled to the first transmission device, wherein the spring assembly is used to support the movable column via the first transmission device in a compressed state.

[0005] In one embodiment, the spring assembly is disposed inside the fixed column along the axial direction of the fixed column, and the first transmission device is disposed inside the fixed column and located above the spring assembly.

[0006] In one embodiment, the first transmission device is coupled to the moving end of the spring assembly, and the moving end is located below the fixed column, and the fixed end of the spring assembly is disposed between the moving end and the first transmission device.

[0007] In one embodiment, a first transmission device is coupled to a moving end of the spring assembly via a connecting rod passing through the spring assembly and a piston block disposed at the end of the connecting rod, wherein the piston block is used to drive the moving end of the spring assembly to move.

[0008] In one embodiment, the interior of the fixed column includes a chamber for accommodating the spring assembly, the top of the chamber for securing the fixed end of the spring assembly, and includes a first opening through which the connecting rod passes.

[0009] In one embodiment, the interior of the chamber includes a bushing for housing a spring assembly, the top of the bushing having a second opening through which a connecting rod passes, and the bushing being coaxially arranged with the chamber.

[0010] In one embodiment, the first transmission device includes a variable diameter drum and a drive drum coaxially arranged, wherein the drive drum is disposed on the side closer to the movable column than the variable diameter drum, the variable diameter drum is coupled to the connecting rod via a first connecting rope and has a variable diameter to convert the variable elastic force of the spring assembly into a constant torque, and the drive drum is coupled to the movable column via a second connecting rope.

[0011] In one embodiment, a variable-diameter drum is used to wind a first connecting rope, a drive drum is used to wind a second connecting rope, and the winding directions of the first and second connecting ropes are opposite.

[0012] In one embodiment, the first transmission device further includes a pulley assembly consisting of at least one movable pulley and at least one fixed pulley. The variable diameter drum is coupled to the connecting rod via a first connecting rope wound through the pulley assembly. The at least one movable pulley is supported on the top of the chamber by a pulley bracket connected to the connecting rod. The at least one fixed pulley is coaxially arranged with the variable diameter drum and the drive drum. One end of the first connecting rope is connected to a fixed point inside the fixed column via the pulley assembly, and the other end is connected to the variable diameter drum via the pulley assembly.

[0013] In one embodiment, it further includes: a crossarm assembly, one end of which is slidably connected to and coupled to a second connecting rope via a movable column; and a head assembly, which is rotatably connected to the other end of the crossarm assembly.

[0014] In one embodiment, the movable column includes a second drive mechanism, and the crossarm assembly is coupled to the first drive mechanism via the second drive mechanism.

[0015] In one embodiment, the second transmission device includes a multi-diameter drum, which includes a first drum portion and a second drum portion for winding a second connecting rope, and a crossarm assembly coupled to the second connecting rope. The diameter of the first drum portion is larger than the diameter of the second drum portion, and the first drum portion is positioned on the side of the multi-diameter drum closer to the crossarm assembly in the axial direction of the multi-diameter drum than the second drum portion.

[0016] In one embodiment, the second transmission device further includes an idler pulley, through which a second connecting rope is connected from a multi-diameter drum to a drive drum, wherein the multi-diameter drum is disposed on the upper side inside the movable column and the idler pulley is disposed on the lower side of the multi-diameter drum.

[0017] In one embodiment, the multi-diameter drum further includes a third drum section, which is disposed on both sides of the first drum section. The third drum section is for winding a third connecting rope, which, together with the second connecting rope, is connected from the multi-diameter drum to the drive drum via an idler pulley.

[0018] In one embodiment, the third connecting rope is configured to bear a smaller load than the second connecting rope when the second connecting rope is operating normally.

[0019] In one embodiment, a first guide rail is provided on a first side of the movable column opposite to the fixed column, a second guide rail is provided on a second side of the movable column opposite to the first side, a first guide wheel assembly for sliding connection with the first guide rail is provided on the side of the fixed column opposite to the first side, and a second guide wheel assembly for sliding connection with the second guide rail is provided on the side of the cross arm assembly opposite to the second side.

[0020] In one embodiment, the lifting device is switchable between a retracted configuration and an extended configuration. In the retracted configuration, the movable column is moved to the bottom relative to the fixed column, the crossarm assembly is moved to the bottom relative to the movable column, the height of the lifting device is at its lowest, and the compression of the spring assembly is at its maximum. In the extended configuration, the movable column is moved to the top relative to the fixed column, the crossarm assembly is moved to the top relative to the movable column, the height of the lifting device is at its highest, and the compression of the spring assembly is at its minimum.

[0021] In one embodiment, the head assembly includes an X-ray source or a detector.

[0022] A second aspect of this disclosure provides a mobile medical imaging device, comprising: a body assembly; a chassis assembly connected to the body assembly, the chassis assembly including a rotating mechanism and a set of wheels; and a lifting device as described in any one of the preceding embodiments, wherein the bottom of the fixed column of the lifting device is fixed to the rotating mechanism, such that the lifting device can rotate with the rotating mechanism.

[0023] A third aspect of this disclosure provides a medical imaging device, comprising: a base; and a lifting device as described in any one of the preceding claims, wherein the bottom of the fixed column of the lifting device is fixed to the base. Attached Figure Description

[0024] Figure 1 An X-ray imaging system 100, as an example of a medical imaging apparatus according to some embodiments of the present disclosure, is shown;

[0025] Figure 2 A schematic diagram of the structure of an example mobile X-ray imaging system 200 according to some embodiments of the present disclosure is shown;

[0026] Figure 3A A schematic diagram of a first state of a mobile X-ray imaging system 300 according to some embodiments of the present disclosure is shown;

[0027] Figure 3B A schematic diagram of a second state of a mobile X-ray imaging system 300 according to some embodiments of the present disclosure is shown;

[0028] Figure 4 A schematic diagram of the structure of an example lifting device 400 according to some embodiments of the present disclosure is shown;

[0029] Figure 5 It shows Figure 4 A partially enlarged schematic diagram of part A of the lifting device 400 in the middle;

[0030] Figure 6 It shows Figure 4 A partially enlarged schematic diagram of part B of the lifting device 400 in the diagram;

[0031] Figure 7 It shows Figure 4 A partially enlarged schematic diagram of part C of the lifting device 400 in the diagram;

[0032] Figure 8 It shows Figure 4 A perspective sectional view of the fixed column 31 of the lifting device 400 in the example;

[0033] Figure 9 A schematic diagram of a retractable configuration of an example lifting device 400 according to some embodiments of the present disclosure is shown;

[0034] Figure 10 A schematic diagram of a partially retracted configuration of an example lifting device 400 according to some embodiments of the present disclosure is shown;

[0035] Figure 11 A schematic diagram of the structure of an example lifting device 500 according to another embodiment of the present disclosure is shown;

[0036] Figure 12 It shows Figure 11 A partially enlarged schematic diagram of part D of the lifting device 500; and

[0037] Figure 13 It shows Figure 11 A partially enlarged schematic diagram of part E of the lifting device 500. Detailed Implementation

[0038] Numerous specific details are set forth in the following description. However, it should be understood that embodiments of this disclosure may be practiced without these specific details. In other instances, well-known circuits, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description.

[0039] References to "one embodiment," "embodiment," "some embodiments," etc., in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in connection with an embodiment, it is believed that the influence of such feature, structure, or characteristic on such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge of those skilled in the art.

[0040] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application description and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses the element or object listed following “comprising” or “including” and its equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” “coupled,” and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0041] In detailing the embodiments of this disclosure, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this disclosure. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0042] Figure 1An X-ray imaging system 100, as an example of a medical imaging apparatus according to some embodiments of the present disclosure, is shown. Figure 1 As shown, the X-ray imaging system 100 includes an X-ray source 104, a detector 106, and a control subsystem 108. In some embodiments, the X-ray imaging system 100 may be a fixed X-ray imaging system disposed in a fixed X-ray imaging chamber, or it may be a mobile X-ray imaging system.

[0043] X-ray source 104 can project X-rays 114 onto a region of interest in the object 102 being inspected. Specifically, X-ray source 104 can be positioned adjacent to a beam limiter 116, which is used to align the X-rays 114 to the region of interest in the object 102 being inspected. At least a portion of the X-rays 114 can be attenuated by the object 102 being inspected and can be incident on detector 106.

[0044] The control subsystem 108 includes a source controller (not shown) and a detector controller (not shown). The source controller commands the X-ray source 104 to emit X-rays 114 for image exposure. The detector controller coordinates the control of various detector functions, such as performing various signal processing and filtering functions, specifically for initial adjustment of dynamic range, interleaving of digital image data, etc. In some embodiments, the control subsystem 108 can provide power and timing signals for controlling the operation of the X-ray source 104 and the detector 106. Specifically, the control subsystem 108 can provide power and timing signals to the X-ray source 104 and / or detector 106 respectively via a power supply 110 and one or more wired and / or wireless communication links 112, wherein the communication link 112 may correspond to a backplane bus, local area network, wide area network, and / or Internet, etc. In some embodiments, the power supply 110 includes one or more batteries; furthermore, although... Figure 1 The diagram shows that the power supply 110 and the X-ray source 104 are connected via a communication link 112; however, those skilled in the art should understand that the power supply 110 and the X-ray source 104 can also be directly coupled.

[0045] Control subsystem 108 can be configured and / or arranged for use in different ways. For example, in some implementations, a single control subsystem 108 may be used; in other implementations, multiple control subsystems 108 are configured to operate together (e.g., based on a distributed processing configuration) or individually, each control subsystem 108 being configured to handle specific aspects and / or functions, and / or process data for generating models that are only used for a specific medical imaging system. In some implementations, control subsystem 108 may be local (e.g., co-located with one or more X-ray imaging systems 100, such as within the same facility and / or the same local network). In other implementations, control subsystem 108 may be remote and therefore accessible only via a remote connection (e.g., via the Internet or other available remote access technologies). In a particular implementation, control subsystem 108 may be configured in a cloud-like manner and may be accessed and / or used in a manner substantially similar to accessing and using other cloud-based systems.

[0046] In some embodiments, system 100 further includes computing device 120, which may be configured to use digital signals to reconstruct one or more desired images and / or determine useful diagnostic information corresponding to the object 102 being examined. The computing device 120 may include one or more dedicated processors, graphics processing units, digital signal processors, microcomputers, microcontrollers, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other suitable processing devices.

[0047] In some embodiments, system 100 further includes a storage device 122, in which computing device 120 can store digitized signals. For example, storage device 122 may include a hard disk drive, floppy disk drive, optical disc read / write (CD-R / W) drive, digital universal disk (DVD) drive, flash memory drive, and / or solid-state storage device. The storage device is used to store programs executable by a computer, which, when executed, cause multiple components of the X-ray imaging system to perform operations corresponding to the aforementioned imaging sequence. When the computer executes the program, it can also perform medical imaging methods to post-process the raw images to obtain post-processed optimized images.

[0048] although Figure 1 The storage device 122, computing device 120, and control subsystem 108 are illustrated as separate devices, but in some embodiments, one or more of them may be combined into a single device to efficiently utilize floor space and / or meet desired imaging requirements.

[0049] In one embodiment, the system 100 further includes a display device 124, which can be used to display reconstructed images and / or diagnostic information, etc.

[0050] In one embodiment, system 100 further includes an operator workstation 126, which allows a user to receive and evaluate reconstructed images, as well as input control commands (operation signals or control signals). Operator workstation 126 may include a user interface (or user input device), such as a keyboard, mouse, voice-activated controller, or any other suitable input device, through which the operator can input operation / control signals to control subsystem 108, such as one or more scan parameters and / or request required diagnostic information and / or images to evaluate the internal structure and / or function of the object under examination 102.

[0051] Figure 2 A schematic diagram of the structure of an example mobile X-ray imaging system 200 according to some embodiments of the present disclosure is shown. The mobile X-ray imaging system 200 may be a reference Figure 1 An example implementation of the described X-ray imaging system 100 includes a body assembly 1, a chassis assembly 2, a column assembly 3, a crossarm assembly 4, and a head assembly 5. For ease of illustration, the height direction of the mobile X-ray imaging system 200 can be defined as the z-direction, the length direction as the x-direction, and the width direction as the y-direction.

[0052] The chassis assembly 2 is connected to the body assembly 1. The chassis assembly 2 includes a rotating mechanism 21 and a set of moving wheels 22. The set of moving wheels 22 enables the movement of the mobile X-ray imaging system 200. The column assembly 3 includes a fixed column 31 and a movable column 32. The movable column 32 is slidably connected to the fixed column 31 in the z-direction, which is the axial direction of the fixed column 31. The fixed column 31 is detachably fixed to the rotating mechanism 21. The fixed column 31 can rotate in a plane perpendicular to the z-direction via the rotating mechanism 21. The cross arm assembly 4 is slidably connected to the movable column 32 in the z-direction. In some embodiments, the cross arm assembly 4 may include a telescopic part (not shown in the figure), the telescopic direction of which is perpendicular to the z-direction. The telescopic distance of the telescopic part can be determined according to the shooting requirements.

[0053] The head assembly 5 is rotatably connected to the crossarm assembly 4. The head assembly 5 can have two rotation states. In one rotation state, the center line of rotation of the head assembly 5 is parallel to the extension / retraction direction of the crossarm assembly 4, and it can rotate within an angle range of ±180°, providing a large rotation angle range. In the other rotation state, the center line of rotation of the head assembly 5 is perpendicular to both the z-direction and the extension / retraction direction of the crossarm assembly 4, and it can rotate within an angle range of -30° to +90°.

[0054] The X-ray tube assembly 5 may include an X-ray tube 51 and a collimator 52. The X-ray tube 51 is used to emit X-rays, while the collimator 52 is used to control the irradiation range of the X-rays, so as to minimize the projection range while enhancing image quality, while still meeting the requirements for X-ray imaging and diagnosis. The X-ray tube 51 may include a reference... Figure 1 The X-ray source 104 is described. The beam limiter 52 may be a reference. Figure 1 The described beam limiter 116.

[0055] The head assembly 5 may include an operating handle 53. The operator can apply force to the operating handle 53, or to other parts of the head assembly 5 or the crossarm assembly 4, to slide and raise the movable column 32 relative to the fixed column 31, and to slide and raise the crossarm assembly 4 and the head assembly 5 relative to the movable column 32. In other words, both the movable column 32 and the crossarm assembly 4 can be raised and lowered independently, thereby adjusting the overall height of the mobile X-ray imaging system 200. In this embodiment, the operating handle 53 is shown as part of the head assembly 5, but in some embodiments, the operating handle 53 may be located in other positions, such as being part of a control console on the body assembly 1.

[0056] exist Figure 2 In this embodiment, the column assembly 3, the crossarm assembly 4, and the head assembly 5 constitute an example implementation of the lifting device of this disclosure. However, it should be understood that the crossarm assembly 4 and the head assembly 5 can also be replaced with other loads as needed. The crossarm assembly 4 and the head assembly 5 can also be configured to be detachable from the movable column 32 of the column assembly 3 for separate transport from the movable column 32.

[0057] Figure 3A A schematic diagram of a first state of a mobile X-ray imaging system 300 according to some embodiments of the present disclosure is shown. Figure 3B A schematic diagram of a second state of a mobile X-ray imaging system 300 according to some embodiments of the present disclosure is shown. The mobile X-ray imaging system 300 may be a reference Figure 2 The mobile X-ray imaging system 200 is described.

[0058] like Figure 3A and Figure 3B As shown, the fixed column 31 can be rotatably mounted on the chassis assembly 2. Figure 3A and Figure 3B In the middle, the fixed column 31 is compared to Figure 2 The state shown is rotated 180° in the xy-plane, so that the movable column 32 is positioned on the positive x-direction side relative to the fixed column 31. The mobile X-ray imaging system 300 is able to... Figure 2 as well as Figures 3A-3B Operate under any of the orientations shown.

[0059] The movable column 32 and the fixed column 31 are oriented in the same direction and slidably connected. Specifically, a first guide rail (not shown) may be provided vertically on the first side of the movable column 32 opposite to the fixed column 31. A first guide wheel assembly that can move within the first guide rail is provided on the side of the fixed column 31 opposite to the first side. The first guide wheel assembly can move within the first guide rail of the movable column 32 to drive the movable column 32 to move relative to the fixed column 31. In some embodiments, the first guide wheel assembly includes, for example, four guide wheels (not shown).

[0060] Similarly, a second guide rail (not shown) can be vertically arranged on the second side of the movable column 32 opposite to the first side. The second side with the second guide rail and the first side with the first guide rail are located on opposite sides of the movable column 32. The cross arm assembly 4 can be slidably connected to the movable column 32 via the second guide rail through the second guide wheel set (not shown).

[0061] like Figure 3A As shown, when the lifting device is in the extended configuration, the movable column 32 is raised to its highest position relative to the fixed column 31, and the horizontal arm assembly 4 is raised to its highest position relative to the movable column 32. At this time, the lifting device reaches its maximum height. Figure 3B As shown, when the lifting device is in the retracted configuration, the movable column 32 is lowered to its lowest position relative to the fixed column 31, and the crossarm assembly 4 is lowered to its lowest position relative to the movable column 32. At this time, the height of the lifting device reaches its minimum. Switching between the extended and retracted configurations can be done by applying an upward or downward force to the operating handle 53 provided on the head assembly 5 or other parts of the head assembly 5 or the crossarm assembly 4.

[0062] The crossarm assembly 4 can be raised and lowered independently. A retaining structure can be provided in the movable column 32 to help hold the crossarm assembly 4 at any height. A retaining structure can also be provided in the fixed column 31 to help hold the movable column 32 at any height.

[0063] The movement of the movable column 32 can be driven by the crossarm assembly 4. During the ascent, the head assembly 5 and the crossarm assembly 4 can be controlled to move relative to the movable column 32, and then the movable column 32 can be controlled to move relative to the fixed column 31. During the descent, the movable column 32 can be controlled to move relative to the fixed column 31, and then the head assembly 5 and the crossarm assembly 4 can again be controlled to move relative to the movable column 32.

[0064] Specifically, when the lifting device is in Figure 3BIn the retracted configuration shown, if the head assembly 5 is raised upwards, the crossarm assembly 4 and the head assembly 5 will move upwards relative to the movable column 32. Before the crossarm assembly 4 and the head assembly 5 reach their highest point relative to the movable column 32, the movable column 32 remains stationary relative to the fixed column 31. If the head assembly 5 is further raised after the crossarm assembly 4 and the head assembly 5 have reached their highest point relative to the movable column 32, the crossarm assembly 4 and the head assembly 5 will cause the movable column 32 to move upwards relative to the fixed column 31 until it reaches its highest point. Figure 3A The expanded configuration is shown.

[0065] On the other hand, when the lifting device is in Figure 3A In the unfolded configuration shown, if the head assembly 5 is pressed down, the crossarm assembly 4 and the head assembly 5 will first cause the movable column 32 to move downward relative to the fixed column 31. Before the movable column 32 reaches its lowest point relative to the fixed column 31, the crossarm assembly 4 remains stationary relative to the movable column 32. If the head assembly 5 is pressed further down after the movable column 32 has reached its lowest point relative to the fixed column 31, the crossarm assembly 4 and the head assembly 5 will move downward relative to the fixed column 31 until... Figure 3B The shrink configuration shown.

[0066] It should be understood that, although in Figure 2 and Figures 3A-3B The head assembly 5 shown includes an X-ray tube 51 and a collimator 52 as a medical imaging device. However, those skilled in the art should know that the lifting device of this application can also be applied to the arrangement of the head assembly 5 including the detector 106.

[0067] In addition, Figure 2 and Figures 3A-3B The image shows a fixed column 31 installed in a mobile medical imaging device configuration on a mobile vehicle. However, the lifting device can also be fixed, for example, the fixed column 31 of the lifting device can be fixed on a base on the ground. Specifically, it can be a detector column in an imaging system that is mounted on the ground in conjunction with an OTS system or a track.

[0068] Figure 4 A schematic diagram of the structure of an example lifting device 400 according to some embodiments of the present disclosure is shown. Figure 5 It shows Figure 4 A partially enlarged schematic diagram of part A of the lifting device 400. Figure 6 It shows Figure 4 A partially enlarged schematic diagram of part B of the lifting device 400. Figure 7 It shows Figure 4 A partially enlarged schematic diagram of part C of the lifting device 400. Figure 8 It shows Figure 4A perspective sectional view of a fixed column 31, representing an example of a lifting device 400. The lifting device 400 can be installed on, for example... Figure 3A and Figure 3B The chassis component 2 shown is suitable for mobile application scenarios, or it can be directly fixed to the ground as described above for fixed application scenarios.

[0069] The fixed column 31 serves as one of the load-bearing structures of the lifting device 400, and internally includes a spring assembly 301 as an energy storage element. The spring assembly 301 has two energy storage states: a compressed state and a stretched state. This disclosure, through a specific structural design, ensures that the spring assembly 301 is always kept in the compressed state, and can change the compression state of the spring assembly 301 according to the load to achieve dynamic balance.

[0070] Specifically, a chamber 302 is axially disposed within the fixed column 31. The chamber 302 is located at the bottom of the fixed column 31. A spring assembly 301 is installed within the chamber 302. In some embodiments, the spring assembly 301 and the chamber 302 may be coaxially arranged. The spring assembly 301 includes a fixed end 301a and a movable end 301b. The fixed end 301a of the spring assembly 301 abuts against or is fixed to the top of the chamber 302, and the position of the fixed end 301a within the fixed column 31 remains unchanged. The movable end 301b of the spring assembly 301 is located on the lower side of the fixed column 31 or the chamber 302. The movable end 301b of the spring assembly 301 is connected to a piston block 303. The piston block 303 can drive the movable end 301b of the spring assembly 301 to move relative to the inner surface of the chamber 302, thereby achieving different degrees of compression of the spring assembly 301. The diameter of piston block 303 is slightly smaller than the inner diameter of chamber 302, allowing piston block 303 to move within chamber 302. On the other hand, the diameter of piston block 303 is larger than the diameter of opening 322 on the base of fixed column 31, thereby ensuring that piston block 303 cannot move further downward through opening 322.

[0071] To dynamically adjust the compression of the spring assembly 301 according to the load, the fixed column 31 further includes a connecting rod 304. The connecting rod 304 passes through the spring assembly 301, thus being disposed within the spring assembly 301. Preferably, the connecting rod 304 is arranged along the axis of the spring assembly 301 to achieve uniform force distribution on the spring assembly 301 in the circumferential direction. One end of the connecting rod 304 is fixedly or detachably connected to the piston block 303, and the other end can pass through the opening 315 at the top of the chamber 302 (e.g., ...). Figure 8The spring assembly 302 (shown) is connected to a transmission device (also called a first transmission device) above the spring assembly 301. The first transmission device is used to transmit the load to the spring assembly 301 to achieve force balance. The first transmission device can move the moving end 301b of the spring assembly 301 via the connecting rod 304 and the piston block 303. The opening 315 at the top of the chamber 302 is sized to allow the connecting rod 304 to pass through, but the spring assembly 301 cannot pass through, thereby ensuring that the spring assembly 301 is always kept within the chamber 302 and remains compressed.

[0072] In some embodiments, such as Figure 8 As shown, an optional bushing 320 can be provided between the spring assembly 301 and the chamber 302. The bushing 320 can be coaxially arranged with the chamber 302 and has an opening like the chamber 302 for the connecting rod 304 to pass through. The bushing 320 can effectively avoid frictional resistance between the spring assembly 301 and the inner wall of the metal chamber 302 during compression and recovery, reducing wear and noise caused by direct metal contact. The use of the bushing 320 also facilitates maintenance, as the bushing 320 is easier to replace than the chamber 302.

[0073] Continue to refer to Figure 4 , Figure 6 and Figure 8 In some embodiments, an adjusting nut 316 may be provided at the bottom of the piston block 303. A connecting rod 304 passes through the piston block 303 and couples to the adjusting nut 316 and the locking nut 317. An opening 322 is provided on the base of the fixed column 31 for the adjusting nut 316 and the locking nut 317 to pass through, allowing the adjusting nut 316 and the locking nut 317 to move together with the moving end of the piston block 303 and the spring assembly 301. By adjusting the adjusting nut 316 and the locking nut 317, the position of the spring assembly 301 can be changed. Figure 4 The minimum compression amount, i.e., pre-compression amount and pre-tension force, is shown in the deployed state. Ignoring the reduction in elastic force due to fatigue, this minimum compression amount is the minimum compression amount of the lifting device 500 throughout the entire operation.

[0074] The fixed end 301a of the spring assembly 301 is disposed between its movable end 301b and the first transmission device. In other words, this disclosure changes the direction of the elastic force of the spring assembly 301 by inverting the spring assembly 301. The movement of the movable end 301b of the spring assembly 301 and the piston block 303 is guided by the chamber 302, that is, it allows movement along the axial direction of the chamber 302.

[0075] The first transmission device is used to transmit the weight of the movable column 32, the cross arm assembly 4 and the head assembly 5 to the spring assembly 301 through the connecting rod 304 and the piston block 303, so that the spring assembly 301 can be compressed to different degrees according to the actual load and extension conditions, thereby achieving dynamic balance of the load of the entire system.

[0076] Specifically, the piston block 303 is connected to the pulley bracket 305 via a connecting rod 304. The connecting rod 304 and the pulley bracket 305 can be fixedly connected, for example, by welding. Alternatively, the connecting rod 304 and the pulley bracket 305 can be integrally formed. The pulley bracket 305 rotatably supports a set of movable pulleys 306 (three are shown in the figure). A set of fixed pulleys 307 (two are shown in the figure) is rotatably disposed above the movable pulleys 306. The movable pulleys 306 and the fixed pulleys 307 are coupled by a first connecting rope 308 to form a pulley assembly. This pulley assembly can reduce the tension required on the first connecting rope 308. The number of movable pulleys 306 and fixed pulleys 307 can be adjusted according to actual needs and is not limited to those shown in the figure.

[0077] One end of the first connecting rope 308 is fixed at point 309, which is fixed to a fixed point inside the fixed column 31. The other end is connected to the variable diameter drum 310 via a pulley system. In other words, the variable diameter drum 310 is coupled to the connecting rod 304 via the first connecting rope 308. This depends on the different extension / retraction states of the lifting device 400 (e.g., ...). Figure 4 , Figure 9 and Figure 10 As shown, the first connecting rope 308 can be wound on the variable-diameter drum 310 with different numbers of turns. The variable-diameter drum 310 has a varying diameter to convert the varying elastic force from the spring assembly 301 into a constant torque. When the compression of the spring assembly 301 is greater, i.e., the moving end 301b is closer to the fixed end 301a, the first connecting rope 308 is wound on the smaller diameter portion of the variable-diameter drum 310. When the compression of the spring assembly 301 is smaller, i.e., the moving end 301b is farther from the fixed end 301a, the first connecting rope 308 is wound on the larger diameter portion of the variable-diameter drum 310. The diameter of the variable-diameter drum 310 can vary monotonically in one direction. In some embodiments, the variable-diameter drum 310 can be a tapered wheel.

[0078] The variable-diameter drum 310 is coaxially arranged with the fixed pulley 307. The fixed pulley 307 is located on the side of the variable-diameter drum 310 with a smaller diameter. The drive drum 311 is located on the side of the variable-diameter drum 310 with a larger diameter. The drive drum 311 is coaxially connected to the variable-diameter drum 310 and the fixed pulley 307. The drive drum 311 is located on the side closer to the movable column 32 than the variable-diameter drum 310. The drive drum 311 is wound with the connecting rope 312 (also called the second connecting rope). The degree of winding of the second connecting rope 312 on the drive drum 311 depends on the extension and retraction state of the lifting device 400, and its winding direction is opposite to the winding direction of the first connecting rope 308.

[0079] The aforementioned movable pulley 306, fixed pulley 307, variable diameter drum 310, drive drum 311, and first connecting rope 308 together constitute the first transmission device within the fixed column 31, enabling the lifting device 400 to balance the weight of the movable column 32, crossarm assembly 4, and head assembly 5 transmitted via the second connecting rope 312, regardless of the extension or retraction state of the lifting device 400. It should be understood that... Figure 4 This is just one example of the first transmission device; other transmission designs may also be used to achieve the force transmission and balance between the elastic force of the spring assembly 301 and the load from the movable column 32.

[0080] One end of the second connecting rope 312 is connected to the drive drum 311, and the other end is coupled to the interior of the movable column 32. The side wall of the movable column 32 has a hole or slot for the second connecting rope 312 to enter. As a result, the drive drum 311 inside the fixed column 31 is coupled to the movable column 32 via the second connecting rope 312. Specifically, the other end of the second connecting rope 312 is connected to the crossarm assembly 4 via an idler pulley 313 and a multi-diameter drum 314 inside the movable column 32. The multi-diameter drum 314 is located on the upper interior side of the movable column 32, and the idler pulley 313 is located on the lower side of the multi-diameter drum 314.

[0081] As the crossarm assembly 4 moves relative to the movable column 32 along a second track (not shown) on the movable column 32, the other end of the second connecting rope 312 moves synchronously, transmitting the gravity of the crossarm assembly 4 and the head assembly 5. The second connecting rope 312, the idler pulley 313, and the multi-diameter drum 314 constitute a transmission device (also referred to as the "second transmission device") within the movable column 32. Thus, the crossarm assembly 4 can be coupled to the first transmission device within the fixed column 31 via the second transmission device.

[0082] like Figure 5As shown, the multi-diameter drum 314 includes a first drum portion 314a with a first diameter D1 and a second drum portion 314b with a second diameter D2. The first diameter D1 is larger than the second diameter D2. The first drum portion 314a is positioned on the side of the multi-diameter drum 314 closer to the crossarm assembly 4 in the axial direction than the second drum portion 314b. The second connecting rope 312 can be wound onto the first drum portion 314a and / or the second drum portion 314b of different diameters according to different extension and retraction states of the lifting device 400, so as to achieve a dynamic balance between the elastic force of the spring assembly 301 and the load. When the compression of the spring assembly 301 is large, the second connecting rope 312 is wound more on the second drum portion 314b with a smaller diameter. Conversely, when the compression of the spring assembly 301 is small, the second connecting rope 312 is wound more on the first drum portion 314a with a larger diameter.

[0083] This embodiment shows an example of a multi-diameter spool 314 having two spool sections, namely a first spool section 314a and a second spool section 314b. However, the multi-diameter spool 314 can also be designed to have more spool sections as needed to achieve different diameter distributions, thereby meeting the required output torque variation characteristics. For example, in some applications, a larger initial torque may be required, while in other applications, a smoother torque output may be needed. By reasonably configuring the diameter and number of spool sections, these different requirements can be met.

[0084] Figure 9 A schematic diagram of the retractable configuration of an example lifting device 400 according to some embodiments of the present disclosure is shown. Figure 10 A schematic diagram of a partially retracted configuration of an example lifting device 400 according to some embodiments of the present disclosure is shown.

[0085] exist Figure 9 In the retractable configuration shown, the movable column 32 moves to the bottom of its movable range relative to the fixed column 31, and the crossarm assembly 4 moves to the bottom of its movable range relative to the movable column 32, resulting in the lowest overall height of the lifting device 400. In this configuration, the movable pulley 305, pulley bracket 305, connecting rod 304, and piston block 303 are pulled to their highest positions. The compression of the spring assembly 301 reaches its maximum.

[0086] To balance the maximum elastic force on the spring assembly 301, the first connecting rope 308 is wound from the larger diameter portion of the variable diameter drum 310 to the smaller diameter portion, maximizing the number of turns. Conversely, the second connecting rope 312 has the fewest (even zero) turns on the first drum portion 314a, and the most turns on the second drum portion 314b. Within the fixed column 31, the second connecting rope 312 has the fewest turns on the drive drum 311.

[0087] In this retractable configuration, the lifting device 400 is in a compact, stowed state, facilitating equipment transportation, storage, or standby. At this time, all moving parts are in their lowest positions, ensuring structural stability and high safety.

[0088] If the operator, for example, through Figure 2 When the operating handle 53 applies an upward (positive z-axis) force to the head assembly 5 in an attempt to lift it, the head assembly 5 will first drive the cross arm assembly 4 upward until the head assembly 5 and the cross arm assembly 4 reach the highest position of their movable range relative to the movable column 32. Figure 10 The partial shrinkage configuration is shown. From Figure 9 The shrink configuration shown is transformed to Figure 10 During the partial retraction configuration shown, the movable column 32 remains relatively stationary with respect to the fixed column 31, while only the cross arm assembly 4 and the head assembly 5 move relative to the movable column 32.

[0089] During this process, the compression of the spring assembly 301 gradually decreases, releasing elastic potential energy, and the moving ends of the pulley bracket 305, movable pulley 306, connecting rod 304, piston block 303, and spring assembly 301 gradually descend. The number of turns of the first connecting rope 308 on the variable diameter drum 310 gradually decreases towards the larger diameter portion. Simultaneously, the number of turns of the second connecting rope 312 on the drive drum 311 gradually increases. In the movable column 32, the second connecting rope 312 gradually winds from the second drum portion 314b onto the first drum portion 314a. Figure 10 In the state shown, the number of turns of the second connecting rope 312 on the first drum portion 314a reaches its maximum, and the number of turns on the second drum portion 314b reaches its minimum.

[0090] exist Figure 10 In the partially retracted configuration shown, if the operator wishes to further raise the head assembly 5 and continues to apply an upward (positive z-axis) force to the operating handle 53, the lifting device 400 will gradually switch to... Figure 4 The unfolded configuration is shown. In this configuration, the overall height of the lifting device 400 reaches its maximum, and the movable column 32 moves to its highest position relative to the fixed column 31 within its movable range.

[0091] During the transition from a partially contracted configuration to an extended configuration, the compression of the spring assembly 301 is further reduced, and the moving ends of the pulley bracket 305, movable pulley 306, connecting rod 304, piston block 303, and spring assembly 301 descend further until they reach... Figure 4The configuration is as follows. During this process, the number of turns of the first connecting rope 308 on the variable diameter drum 310 is further reduced. At the same time, the number of turns of the second connecting rope 312 on the drive drum 311 is further increased. In the movable column 32, the winding state of the second connecting rope 312 on the multi-diameter drum 314 remains unchanged. That is, the number of turns of the second connecting rope 312 on the first drum portion 314a reaches its maximum, and the number of turns on the second drum portion 314b reaches its minimum.

[0092] Should Figure 4 In the deployed configuration shown, the piston block 303 abuts against the bottom of the cavity 302, preventing the moving end of the spring assembly 301 from moving further downward. The spring assembly 301 remains compressed, but its elastic restoring force is minimized. At this time, the number of turns of the first connecting rope 308 on the variable diameter drum 310 is minimized, and the number of turns on the drive drum 311 is maximized, achieving the maximum lifting height of the lifting device 400, suitable for scenarios requiring high-level operations.

[0093] Conversely, if you wish to move the lifting device 400 from... Figure 4 The expanded configuration shown is converted to Figure 9 The retraction configuration shown allows a downward (negative z-axis) force to be applied to the head assembly 5. During this process, the lifting device 400 first switches to... Figure 10 The partially retracted configuration shown allows the movable column 32 to move downwards relative to the fixed column 31, while the crossarm assembly 4 and the head assembly 5 remain stationary relative to the movable column 32. If a downward force is continuously applied to the head assembly 5, the crossarm assembly 4 and the head assembly 5 move downwards relative to the movable column 32 until... Figure 9 The shrink configuration shown.

[0094] It should be understood that the lifting device 400 can maintain Figure 4 , Figure 9 and Figure 10 Any of the three configurations shown can be configured, rather than being limited to one of them. Figure 4 , Figure 9 and Figure 10 The configuration shown. Regardless of the configuration, the crossarm assembly 4 can extend and retract independently.

[0095] This disclosure utilizes a compression spring as a power output element. The spring assembly 301 is always kept in a compressed state, and the elastic force of the spring assembly 301 is effectively transmitted to the load through the piston block 303 and the connecting rod 304, thereby achieving dynamic balance with the load.

[0096] In contrast, another type of lifting device uses a tension spring as the power output. In this tension spring design, the fixed end of the spring faces downwards, the moving end faces upwards, and it connects to the pull head. The tension of the spring is used to balance the load. However, the connection between the tension spring and the pull head is complex, requiring the production of a pull head that matches the spring's helix, and the outer surface of the pull head needs to be machined into a helical curved surface, which is difficult to manufacture. Furthermore, the connection between the tension spring and the pull head usually requires welding, and the thermal stress generated during welding reduces the spring's mechanical properties, thus affecting its fatigue life. Moreover, during the lifting of the movable column, the tension spring tends to generate significant noise due to repeated stretching.

[0097] In contrast, the compression spring design employed in this disclosure effectively avoids the aforementioned problems. Firstly, by pointing the moving end of the spring assembly downwards, the direction of the elastic force is changed, making it the same as the direction of the elastic force in the tension spring design. Simultaneously, this disclosure further utilizes a piston block and connecting rod to transmit force with the first transmission system. This piston block and connecting rod structure design eliminates the need for welding connections between the spring assembly and the piston block or connecting rod, thus simplifying the assembly process, reducing manufacturing costs, and avoiding the heat effects of welding, ensuring the mechanical properties and long-term reliability of the spring assembly. Secondly, the compression spring primarily bears axial pressure during operation, resulting in more uniform stress distribution and a significantly longer fatigue life than a tension spring with the same output force, meeting the requirements for higher frequency and longer service life. Furthermore, the smooth movement of the compression spring during compression and release helps reduce noise.

[0098] Furthermore, the installation and maintenance of the compression spring are more convenient, eliminating the need to cut weld joints, facilitating later inspection and replacement, and reducing maintenance costs. Due to the simple structure and clearly defined force of the compression spring, it also effectively improves the safety of the device, reducing safety hazards caused by spring assembly breakage or connection failure. Therefore, the compression spring power output scheme described in this disclosure not only optimizes the structural design of the lifting device but also significantly improves the device's performance and reliability while reducing costs.

[0099] In some embodiments, such as Figure 8As shown, the fixed column 31 may further include a brake 318. The brake 318 is coaxially arranged with the fixed pulley 307, the variable-diameter drum 301, and the drive drum 311 to apply braking force to the drive drum 311 during the operation of the lifting device 400, thereby effectively locking or slowly releasing the movable column 32 and its upper structure. When the lifting device 400 is stationary or needs to maintain a specific height, the brake 318 can lock the drive drum 311 in time to prevent accidental slippage due to external forces or system malfunctions, improving the safety of the device. During lifting operations, the brake 318 can also provide appropriate damping or buffering as needed to ensure the smoothness of the lifting movement and avoid impacts and shaking caused by inertia or sudden operations. Furthermore, the brake 318 allows the operator to more precisely control the lifting speed and stopping position during lifting operations. The brake 318 can adopt various structural forms such as mechanical, pneumatic or electromagnetic. The specific type can be selected and optimized according to the actual application requirements, and this application does not limit it.

[0100] In some embodiments, the fixed column 31 and / or the movable column 32 may include a limiting mechanism (not shown). The limiting mechanism within the fixed column 31 limits the maximum range of movement of the movable column 32 to prevent additional tension on the first connecting rope 308 and the second connecting rope 312 when further movement is impossible. Similarly, the limiting mechanism within the movable column 32 limits the maximum range of movement of the crossarm assembly 4. The structure and location of the limiting mechanism are not limited. For example, the limiting mechanism may be located inside the fixed column 31 and / or the movable column 32, or it may be located in the first track and / or the second track described above. Furthermore, the limiting mechanism may employ mechanical limiting, electronic limiting, or other suitable methods to adapt to different working environments and usage requirements.

[0101] Figure 11 A schematic diagram of the structure of an example lifting device 500 according to another embodiment of the present disclosure is shown. Figure 12 It shows Figure 11 A partially enlarged schematic diagram of part D of the lifting device 500. Figure 13 It shows Figure 11 A partially enlarged schematic diagram of part E of the lifting device 500.

[0102] Reference Figures 4 to 10Compared to the lifting device 400, the lifting device 500 has a newly added third drum section 314c on its multi-diameter drum 314, and also adds a spare third connecting rope 319 (also called a safety rope). One end of the third connecting rope 319 can be wound on the third drum section 314c, and the other end, together with the second connecting rope 312, is connected to the drive drum 311 via an idler pulley 313, realizing a dual-rope parallel transmission structure. The third drum section 314c has an independent third diameter D3. In some embodiments, the third diameter D3 is the same size as the second diameter D2, such that the load change rate of the second connecting rope 312 and the third connecting rope 319 is the same.

[0103] To accommodate the simultaneous winding of two connecting ropes, the drive drum 311 can, for example, employ a double-groove design, with one groove for winding the second connecting rope 312 and the other for winding the third connecting rope 319. Even if one connecting rope fails, the other spare connecting rope can continue to function, improving the safety and reliability of the lifting device 500. In some embodiments, the third connecting rope 319 can be configured to bear a smaller load than the third connecting rope 319 during normal operation, thereby extending its fatigue life and making its service life longer than that of the third connecting rope 319.

[0104] The fixed column 31 of the lifting device 500 may further include a ratchet 320 and a pawl 321. The ratchet 320 is coaxially arranged with the drive drum 311 and the variable diameter drum 310. The pawl 321 is coupled to the first connecting rope 308. When the second connecting rope 312 breaks, the pawl 321 will be triggered by the tension spring and quickly lock the ratchet 320, thereby effectively preventing the drive drum 311 and the variable diameter drum 310 from rotating further.

[0105] The preferred embodiments of this disclosure have been described in detail above. However, it should be understood that various embodiments and modifications can be adopted without departing from the broad spirit and scope of this disclosure. Those skilled in the art can make many modifications and changes based on the concept of this disclosure without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this disclosure through logical analysis, reasoning, or limited experimentation on the basis of the prior art should fall within the protection scope defined by the claims of this disclosure.

Claims

1. A lifting device, characterized in that, include: A fixed column includes a first transmission device and a spring assembly coupled to the first transmission device; The movable column is slidably connected to and coupled to the fixed column and the first transmission device. The spring assembly is used to support the movable column via the first transmission device when it is compressed.

2. The lifting device as described in claim 1, wherein, The spring assembly is disposed inside the fixed column along the axial direction of the fixed column, and The first transmission device is disposed inside the fixed column and located above the spring assembly.

3. The lifting device as described in claim 1, wherein, The first transmission device is coupled to the moving end of the spring assembly, and the moving end is located on the lower side of the fixed column, and the fixed end of the spring assembly is disposed between the moving end and the first transmission device.

4. The lifting device as described in claim 1, wherein, The first transmission device is coupled to the moving end of the spring assembly via a connecting rod passing through the spring assembly and a piston block disposed at the end of the connecting rod, wherein the piston block is used to drive the moving end of the spring assembly to move.

5. The lifting device as described in claim 4, wherein, The interior of the fixed column includes a chamber for accommodating the spring assembly, the top of the chamber for securing the fixed end of the spring assembly and including a first opening through which the connecting rod passes.

6. The lifting device as described in claim 5, wherein, The interior of the chamber includes a bushing for accommodating the spring assembly, the top of the bushing having a second opening through which the connecting rod passes, and the bushing being coaxially arranged with the chamber.

7. The lifting device as described in claim 5, wherein, The first transmission device includes a variable diameter drum and a drive drum arranged coaxially. The drive drum is positioned on the side closer to the movable column than the variable diameter drum. The variable-diameter drum is coupled to the connecting rod via a first connecting rope and has a varying diameter to convert the varying elastic force of the spring assembly into a constant torque. The drive drum is coupled to the movable column via a second connecting rope.

8. The lifting device as described in claim 7, wherein, The variable diameter drum is used to wind the first connecting rope, and the drive drum is used to wind the second connecting rope, with the first connecting rope and the second connecting rope being wound in opposite directions.

9. The lifting device as described in claim 8, wherein, The first transmission device further includes a pulley block consisting of at least one movable pulley and at least one fixed pulley, and the variable diameter drum is coupled to the connecting rod via a first connecting rope wound through the pulley block. The at least one movable pulley is supported on the top of the chamber by a pulley bracket connected to the connecting rod, and the at least one fixed pulley is coaxially arranged with the variable diameter drum and the drive drum. One end of the first connecting rope is connected to a fixed point inside the fixed column via the pulley group, and the other end is connected to the variable diameter drum via the pulley group.

10. The lifting device as claimed in claim 8, wherein, Also includes: A cross arm assembly, one end of which is slidably connected to the movable column and coupled to the second connecting rope; as well as A head assembly, which is rotatably connected to the other end of the crossarm assembly.

11. The lifting device as claimed in claim 10, wherein, The movable column includes a second transmission device, and the cross arm assembly is coupled to the first transmission device via the second transmission device.

12. The lifting device as claimed in claim 11, wherein, The second transmission device includes a multi-diameter drum, which comprises a first drum portion and a second drum portion for winding the second connecting rope. The crossarm assembly is coupled to the second connecting rope. Wherein, the diameter of the first spool section is larger than the diameter of the second spool section, and The first drum section is positioned on the side closer to the crossarm assembly in the axial direction of the multi-diameter drum than the second drum section.

13. The lifting device as described in claim 12, wherein, The second transmission device further includes an idler pulley, through which the second connecting rope is connected from the multi-diameter drum to the drive drum. The multi-diameter drum is located on the upper side inside the movable column, and the idler wheel is located on the lower side of the multi-diameter drum.

14. The lifting device as described in claim 13, wherein, The multi-diameter spool further includes a third spool section, which is disposed on both sides of the first spool section. The third drum section is used for winding a third connecting rope, which, together with the second connecting rope, is connected from the multi-diameter drum to the drive drum via the idler pulley.

15. The lifting device as described in claim 14, wherein, The third connecting rope is configured to bear a smaller load than the second connecting rope when the second connecting rope is working normally.

16. The lifting device as claimed in claim 10, wherein, A first guide rail is provided on the first side of the movable column opposite to the fixed column, and a second guide rail is provided on the second side of the movable column opposite to the first side. The fixed column has a first guide wheel set on the side opposite to the first side for sliding connection with the first guide rail. The crossarm assembly has a second guide wheel set on the side opposite to the second side for sliding connection with the second guide rail.

17. The lifting device as claimed in claim 10, wherein, The lifting device can switch between a retracted configuration and an extended configuration. In the retracted configuration, the movable column moves to its lowest position relative to the fixed column, the crossarm assembly moves to its lowest position relative to the movable column, the lifting device reaches its lowest height, and the spring assembly reaches its maximum compression. In the deployed configuration, the movable column moves to the top relative to the fixed column, the cross arm assembly moves to the top relative to the movable column, the lifting device reaches its maximum height, and the spring assembly reaches its minimum compression.

18. The lifting device as claimed in claim 10, wherein, The head assembly includes an X-ray source or a detector.

19. A mobile medical imaging device, characterized in that, include: fuselage components; A chassis assembly connected to the fuselage assembly, the chassis assembly including a rotating mechanism and a set of wheels; as well as The lifting device according to any one of claims 1-18, wherein the bottom of the fixed column of the lifting device is fixed to the rotating mechanism, so that the lifting device can rotate with the rotating mechanism.

20. A medical imaging device, characterized in that, include: Base; as well as The lifting device as described in any one of claims 1-18, wherein the bottom of the fixed column of the lifting device is fixed to the base.

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