52 results about "Mobile bearing" patented technology

The invention discloses a multifunctional vehicle for cleaning high-voltage porcelain insulators, which belongs to the technical field of porcelain insulator cleaning and comprises a movable bearing unit, a multifunctional operation unit, a cleaning medium supply unit and a control unit. The cleaning medium supply unit and the control unit are both arranged on the movable bearing unit, and the multifunctional operation unit is detachably installed at the operation end of the movable bearing unit. The multifunctional operation unit is a self-adaptive opening and closing cleaning bin or a manned car hopper or a multi-shaft cleaning ring; the cleaning medium supply unit is communicated with a part with a cleaning function in the multifunctional operation unit and is used for supplying a cleaning medium; the control unit is electrically connected with the movable bearing unit, the multifunctional operation unit and the cleaning medium supply unit and used for receiving the detection signals and outputting control instructions. The safety risk of traditional high-altitude operation can be effectively avoided, the operation efficiency is greatly improved, and the diversified operation requirements of power equipment operation and maintenance are met.

The invention discloses a high-voltage porcelain insulator cleaning device and method with a multi-shaft cleaning ring, and belongs to the technical field of porcelain insulator cleaning. The high-voltage porcelain insulator cleaning device comprises a movable bearing unit, a cleaning medium supply unit, a multi-shaft cleaning unit and a control unit; the control unit and the cleaning medium supply unit are arranged on the movable bearing unit; the multi-axis cleaning unit is installed at the operation end of the movable bearing unit, and the multi-axis cleaning unit has multi-dimensional stretching and rotating adjustment degrees so as to adapt to cleaning of porcelain insulators at different positions and angles; the cleaning medium supply unit is communicated with the multi-shaft cleaning unit to supply a cleaning medium; the control unit is electrically connected with the cleaning medium supply unit and the multi-axis cleaning unit and used for receiving the detection signals and outputting control instructions. The problems that in an existing outdoor high-voltage porcelain insulator cleaning mode, the high-altitude operation safety risk is high, the operation efficiency is low, and cleaning of an asparagus area is not thorough can be effectively solved.

The invention discloses a high-voltage porcelain insulator cleaning device and method, and belongs to the technical field of porcelain insulator cleaning. The high-voltage porcelain insulator cleaning device comprises a movable bearing unit, a cleaning medium supply unit, a self-adaptive opening and closing cleaning unit and a control unit; the control unit and the cleaning medium supply unit are arranged on the movable bearing unit; the self-adaptive opening and closing cleaning unit is installed at the operation end of the movable bearing unit, the opening and closing size is automatically adjusted according to the diameter of the porcelain bottle, and a cleaning execution assembly is arranged on the inner side. The cleaning medium supply unit is communicated with the self-adaptive opening and closing cleaning unit and is used for supplying a cleaning medium; the control unit is electrically connected with the cleaning medium supply unit and the self-adaptive opening and closing cleaning unit and used for receiving the detection signal and outputting a control instruction. The problems that in an existing outdoor high-voltage porcelain insulator cleaning mode, the high-altitude operation safety risk is high, the operation efficiency is low, and time and labor are consumed can be effectively solved.

The invention discloses an intelligent mechanical cutter suction system based on culvert dredging, and relates to the field of intelligent control, the intelligent mechanical cutter suction system comprises a mobile bearing module, the left side of the top end of the mobile bearing module is provided with a mechanical arm execution component, and the center of the top end of the mobile bearing module is provided with a main control unit, the power module is used for providing moving capacity and overall power support for all functional parts and modules through a walking mechanism and an energy system; the mechanical arm execution component is used for executing cutter suction dredging operation through a mechanical arm driven by the hydraulic driving system and a hydraulic cutter suction head at the tail end of the mechanical arm; when facing complex and changeable culvert deposits, the device always keeps the most efficient cutting and suction state, the overall dredging time is greatly shortened, the operation accuracy and consistency are improved, the mechanical structure overload and collision risks caused by rough operation or path deviation are reduced, and the service life of a core working device is prolonged.

The application discloses a kind of with pressure operating device and its control method, for with pressure well repair pipe column operation, including mobile slip group, mobile crossbeam, lifting oil cylinder, fixed slip group and lower working platform;Mobile slip group includes mobile anti-top cone slip, mobile bearing cone slip, mobile universal slip by first connecting piece connection;Fixed slip group includes fixed anti-top cone slip, fixed bearing cone slip, fixed universal slip by second connecting piece connection;Mobile universal slip and fixed universal slip are used for in the state of pipe column suspended weight as neutral point state alternately operation;Mobile bearing cone slip and fixed bearing cone slip are used for in the state of pipe column suspended weight as heavy pipe column alternately operation;Mobile anti-top cone slip and fixed anti-top cone slip are used for in the state of pipe column suspended weight as light pipe column alternately operation.The application can improve the safety of pipe column operation, simplify operation, improve operation efficiency, reduce labor intensity.

The present application relates to the technical field of rescue vehicles, in particular to a visual recognition intelligent mobile vehicle and a use method, comprising: a mobile bearing assembly, comprising a vehicle chassis frame provided with four Macadam wheels, and a top chassis frame installed above the vehicle chassis frame, used to provide a mobile and bearing basis; a temporary storage assembly installed on the top chassis frame, used to bear and collect clamped objects; a clamping jaw part, comprising a mechanical arm rotatably installed on the top chassis frame, and a clamping jaw unit installed at the front end of the mechanical arm and used to clamp target objects; and a visual assembly installed at the front end of the top chassis frame, used to collect images for visual recognition; the device can integrate visual recognition, mechanical arm grabbing and temporary storage functions, realize automatic target recognition, accurate grabbing and safe transfer, and overcome the defects of single function, low operation efficiency and dependence on manual control of existing equipment.

The invention belongs to the field of engine assembly, and particularly relates to a loading control system for a rotating part in a semi-closed cavity, which comprises a bearing system and a spring system, the spring system is connected into the bearing system, and the spring system can be pushed and pulled by moving the bearing system; the spring system comprises a blind hole shaft, a large spring and a small spring; the small spring is coaxially connected into a blind hole of the blind hole shaft, and the large spring is coaxially connected to the outer wall of the blind hole shaft. One ends of the large spring and the small spring are free ends, and the other ends are fixed ends; the free ends and the fixed ends of the large spring and the small spring are positioned in the same direction; the device is small, light, easy to operate, simple in structure and low in machining cost. The device can adapt to the axial force loading operation of a rotating part in a semi-closed cavity with a small internal space, a narrow outlet and a low visual degree, and can also be used in an open space to replace similar equipment with similar functions but complex structures.

The utility model discloses an electric arc swing platform, include: drive assembly, fixed component, sliding assembly, the drive assembly includes: motor, with the output shaft connection of motor's ball screw, with ball screw cooperation's screw rod nut, with the push frame of screw rod nut connection, the fixed component includes: the base that is provided with mobile groove, arc groove, install first support bearing, second support bearing on the base, the both ends of ball screw are installed on the inner ring of first support bearing, second support bearing respectively, the utility model discloses a movable bearing is used to push the angle inclination, and simple structure, and transmission is efficient, need not adopt the structure of worm and worm precision cooperation to can reduce the machining accuracy of spare part, reduce product manufacturing cost.

The invention relates to the technical field of anti-falling equipment, in particular to fixed wall type anti-falling equipment for assisting old people in defecation, which comprises an arched door type support frame, upper top bearing battens are symmetrically and fixedly arranged on two sides of the upper end of the arched door type support frame, and an electric telescopic rod is fixedly mounted at one end, close to the arched door type support frame, of each upper top bearing batten. Moving limiting grooves are symmetrically formed in the two sides of the arched door type supporting frame, when the old man gets up, the two protective moving bearing plates are closed together, in this way, the old man can be protected in the protective moving bearing plates, the phenomenon that the old man tumbles forwards is avoided, an electric telescopic rod retracts when the old man gets up, and therefore the old man can get up conveniently. The movable arm supporting batten can be driven to move upwards, a certain supporting and pushing effect is achieved on the standing-up of the old, and it is guaranteed that the old cannot fall down under the action of the protective movable bearing plate while the old can stand up more easily.

Extraction attachment for a tool (300), in particular a drilling tool (302), comprising a housing (13) with an end-face opening (16) designed to receive the tool (300), a bearing unit (28) for mounting the extraction attachment (10) on the tool (300), an extraction opening (20) for coupling the extraction attachment (10) to an extraction device (11), wherein the end-face opening (16) and the extraction opening (20) form a transport channel (26), wherein the extraction attachment (10) is mounted axially movable and rotatable on the tool (300) by means of the bearing unit (28) such that the position of the extraction attachment (10) relative to the tool (300) changes with increasing bore depth, characterized in that the extraction attachment (10) has an actuating element (36) by means of which the position of the movable bearing element can be controlled. (32) is adjustable.

The direct drive device (10) has a bearing (14) fitted to the outer periphery of a ball screw (12), a nut holder (30) through which the ball screw (12) is inserted, and a bearing pressing member (22) fixed to a motor housing (16) in a state where the ball screw (12) is inserted into a through hole (36), which restricts the axial movement of the bearing (14) in the motor housing (16), the bearing pressing member (22) having a cutout portion (40) extending radially from the inner peripheral surface of the through hole (36) to the outer peripheral surface of the bearing pressing member (22).

The invention relates to a building continuous translation device and method.The device comprises a paving steel plate, a movable bearing mechanism, a frame beam, a pushing mechanism and a continuous traction mechanism, the paving steel plate is flatly laid on a horizontal foundation, the bottom of the frame beam is arranged on the paving steel plate through the movable bearing mechanism, and a building is fixedly arranged at the top of the frame beam; a pushing mechanism is arranged at the tail of the frame beam, and a continuous traction mechanism is arranged at the head; the pushing mechanism pushes the frame beam to start the building on the frame beam; after being started, the continuous traction mechanism drags the frame beam, and continuous displacement of the building is achieved. The gravity of the building is dispersedly transmitted to the ground by utilizing the paving steel plate, the building is started by utilizing the rear pushing mechanism, and the building is dragged from the front by utilizing the continuous traction mechanism, so that the aim of uninterrupted continuous translation of the building is fulfilled. The continuous traction mechanism realizes continuous translation of the building so as to ensure that kinetic friction force is always generated in the translation process, and the maximum static friction force is generated only when the building is started.

The bending machine for motorcycle production relates to the technical field of motorcycle production and comprises a bending device body, the bending device body comprises a machining table, a support is fixedly installed on the left side of the front portion of the top of the machining table, and a moving groove is formed in the middle of the left side of the top of the machining table. A bending unit is arranged at the top of the machining table, a material taking unit is arranged at the position, located on one side of the bending unit, of the top of the machining table, the bending unit comprises a motor fixedly installed at the bottom end of the machining table, and the output end of the motor is fixedly connected with a driving rod. The fixed bearing block and the movable bearing block are arranged for bearing and limiting a raw material steel pipe, so that the raw material steel pipe has stability during bending, the grip is rotated to drive the threaded rod to rotate along with the grip, the movable bearing block can be promoted to move front and back, the bearing position can be conveniently adjusted according to the length of the raw material steel pipe, and then the effect of precise machining is achieved.

The invention provides a dual-bearing reel capable of smoothly moving a pinion gear. A dual-bearing reel (100) is provided with a reel body (2), a spool (3), a spool shaft (4), a handle (5), a pinion gear (15), a clutch control mechanism (22), and bearings (16a, 16b). The pinion gear (15) moves between a transmission position at which the rotational force of the handle (5) is transmitted to the spool shaft (4) and a blocking position at which the transmission of the rotational force of the handle (5) to the spool shaft (4) is blocked. The bearings (16a, 16b) support the pinion gear (15) so that the pinion gear (15) can rotate with respect to the reel body (2). When the pinion gear (15) moves between the transmission position and the blocking position, the bearings (16a, 16b) move together with the pinion gear (15).

The utility model discloses a static friction angle measuring device based on simulated rock structural surface slippage, which comprises a shell, a moving mechanism is arranged in the shell, the moving mechanism is in driving connection with a moving bearing platform, a coating box body is arranged above the moving bearing platform, a mounting groove is formed in the lower part of the coating box body, and a plurality of fixing screws are in threaded connection with the periphery of the coating box body. The inner end of the fixing screw is located in the mounting groove, a testing box is arranged on the shell and comprises a measuring rod, and the end of the measuring rod faces the wrapping box body.

Linear drive for providing linear motion, comprising a profile arm (2) extending along an axis of motion (8) and a guide arrangement (3) arranged linearly movable along the axis of motion (8) on the profile arm (2), the guide arrangement comprising a gear mounted for rotation, and a toothed belt (5) extending along the axis of motion (8), which partially wraps around the gear and is fixed at each end to the profile arm (2), wherein the profile arm (2) has a guide recess (82) extending along the axis of motion (8), in which at least one guide surface (107, 108, 109, 110) is formed for a linearly movable bearing of the guide arrangement (3), wherein the guide arrangement (3) comprises at least one guide element (85, 86) that engages in the guide recess (82) and rests on the guide surface (107, 108, 109, 110). lieswherein at least one connection opening (96) is formed on an outer surface (95) of the guide arrangement (3) and wherein at least one outlet opening (97) is formed on an inner surface (103) of the guide arrangement (3) facing the guide recess (82), wherein the guide arrangement (3) is penetrated by at least one fluid channel (98) between the at least one connection opening (96) and the at least one outlet opening (97), characterized in that a cover strip (83) is associated with the profile extension (2), which extends with a longest edge parallel to the axis of movement (8) and which covers the guide recess (82).

The application discloses a kind of test device for sensor, including test unit, including mobile bearing assembly, with mobile bearing assembly vertical insertion self-weight locking assembly, with mobile bearing assembly lateral insertion and symmetrically arranged two groups of adjusting base assembly, mobile debugging component is arranged in mobile bearing assembly and is limited with self-weight locking assembly bottom insertion, and first sensor and second sensor are respectively arranged in adjusting base assembly and are arranged in adjusting base assembly; Self-weight locking assembly is limited and can only move up and down along vertical direction;Adjusting base assembly is limited and can only move left and right along horizontal direction.The beneficial effects of the present application are that multiple sensors are simultaneously clamped by using the self-weight of the clamping member to ensure stability;After clamping and stabilizing, the longitudinal limit sensing distance and the transverse interval distance change test of the two sensors can be performed by rotating the outer adjusting rod, without frequent handling, improving the test efficiency and service life.

The bearing unit (10) has: a thrust damper (20) capable of expanding and contracting in the axial direction of a shaft (2A) disposed in a gear case (4) and limited in movement to one side in the axial direction; a bearing receiving member (30) held to the thrust damper (20) from the other side in the axial direction of the thrust damper (20); a bearing bush retaining frame (50) holding the bearing receiving member (30) in a manner separable in the axial direction; and an oil-impregnated bearing bush (40) held to the bearing bush retaining frame (50) and disposed on the other side of the bearing receiving member (30). The thrust damper (20), the bearing receiving member (30), the bearing bush retaining frame (50), and the oil-impregnated bearing bush (40) are integrated before assembly to the gear case (4).

The invention provides a movable post-fire gaseous fire extinguishing agent discharging device and a working method thereof, and the movable post-fire gaseous fire extinguishing agent discharging device comprises a movable bearing platform, a negative pressure pumping and discharging system, a gas detector and an air bag, the function of discharging residual gas after gas fire extinguishing is integrated into the modularized and movable discharging device, the device can replace all functional assemblies needing to be installed on site in a traditional fixed ventilation system, and a special linkage control valve and a complex control system do not need to be arranged. The method has the technical advantages that the building space occupation requirement is remarkably reduced, and the initial construction investment cost is reduced; reusability is achieved, and flexible deployment and quick response are supported; by means of the modular design, efficient gas emission operation is achieved, a fixed facility installation procedure is not needed, the device can be put into use at any time, and therefore the emission efficiency and emergency disposal flexibility of gas extinguishing agent residual gas (such as heptafluoropropane, IG541 and carbon dioxide) after fire extinguishing are systematically improved.

The invention discloses a positioning method, system and tool used in movable plateau unicompartmental knee arthroplasty, and the method comprises the following steps: when a patient is in a lithotomy position, vertically and upwards extending the inward 1 / 3 position of a tibial tuberosity of the patient to the upper edge of patella and then extending to the body surface connecting line of anterior superior spine of iliac, and determining the ilioshin line of the patient; determining the inner side edge of the vertex of the tibial spine on the inner side of the patient as an osteotomy starting point; determining that the saw blade direction of osteotomy is parallel to the ilioshin line; the installation position of the thighbone drilling guider is located at the position with the distance of 5.25-7.25 mm from the vertical osteotomy face of the tibia through a quantification method; the rotating position of the femoral prosthesis is limited through geometric constraint, so that the connecting line of the center points of the two preset fixing nails on the femoral prosthesis is perpendicular to the tibia osteotomy surface. Good tibia prosthesis rotation is obtained by accurately guiding tibia vertical osteotomy through the body surface iliotibia line, good liner inner and outer side positions are obtained by quantifying the distance between the thighbone drilling guider and the tibia vertical osteotomy surface, and a good liner movement track can be provided.

The application discloses a friction plate with thickness compensation function for traction machine and relates to the technical field of the friction plate for traction machine.The friction plate comprises a mounting shell, a movable groove is formed in the inner side of the mounting shell, a clamping groove is formed in the inner side of the movable groove, the clamping groove is formed on the inner wall of the mounting shell, a supporting seat is movably arranged on the inner side of the movable groove, and clamping blocks are arranged on the outer walls of the two sides of the supporting seat.The application is provided with a screw rod, a pressure sensor and a handle, a threaded ring supports the screw rod on the inner side, the screw rod is connected with a bearing seat, the bearing seat is connected with the pressure sensor, the pressure sensor is connected with a connecting seat, the threaded ring supports the screw rod on the inner side, the rear end of the screw rod is provided with the handle, a user holds the handle to rotate the screw rod, the screw thread on the outer side of the screw rod is rotated, the screw rod moves in the inner side of the threaded ring, the screw rod drives the bearing seat to move, the bearing seat drives the connecting seat to move, the connecting seat drives the friction plate assembly to move, and the extension length of the friction plate assembly can be adjusted according to the requirement.

The liftable working table comprises a main frame, a lifting table, a moving assembly and a clamping assembly, the lifting table is arranged in the main frame in a sliding mode, a bearing table is arranged in the lifting table in a rotating mode, a containing groove and a moving groove are formed in the bearing table, the moving assembly is connected with the bottom of the lifting table, and the clamping assembly is connected with the bottom of the lifting table. The clamping assembly comprises a bearing plate, a first spring, clamping plates, a second spring, a connecting rod, a moving frame and a moving shaft, the bearing plate is arranged in the containing groove in a sliding mode, the clamping plates are located on the two sides of the bearing plate respectively, the connecting rod is connected with the clamping plates and the moving shaft respectively, an inclined sliding groove is formed in the moving frame, and the moving shaft is arranged in the inclined sliding groove in a sliding mode. According to the lifting table, the height of the lifting table can be adjusted through the moving assembly, so that the flexibility of the lifting table is improved, the lifting table is convenient to use, the clamping assembly can clamp and fix articles in the containing groove, the articles can be taken out conveniently and rapidly, the articles are prevented from being mixed with other articles on the table top, and related work is facilitated.

The utility model relates to bearing assembly technical field, especially a kind of positioning workstation for bearing installation, including workstation, the side of the workstation is provided with mechanical arm, the mechanical arm is used to clamp and move bearing, the top of the workstation is fixedly installed with support, the front side of the support is spaced apart and is provided with angle adjusting module fixedly installed in the top of workstation, the top of the support is fixedly installed with hydraulic cylinder, the bottom of the hydraulic cylinder is fixedly installed with pressing plate. By adopting the above technical scheme, the part that needs to install bearing is clamped and fixed by angle adjusting module when using, then the bearing is placed in the position that part needs to install bearing by mechanical arm clamping, the bearing is pressed on part by the pressing plate of hydraulic cylinder.

The invention discloses an air floatation moving bearing surface type supercritical carbon dioxide static pressure thrust bearing pressure distribution measuring device, and belongs to the field of gas lubrication and performance detection. The device mainly comprises a vibration isolation plate, a bearing platform with a pressure measuring hole, a linear air floating guide rail, an arc-shaped air floating guide rail, a double-layer chamber, a labyrinth seal, a static pressure gas bearing, a sensor and a collector. According to the device, the two-dimensional, non-contact and friction-free movement of the bearing platform is realized by combining the air floating guide rail and the labyrinth seal, the pressure measuring hole is driven to be aligned with any position to be measured, and the continuous and complete measurement of the pressure of the bearing surface is completed. An inner-layer cavity of the device is used for containing supercritical carbon dioxide and a hydrostatic bearing; compressed air is introduced into the outer-layer cavity to form a positive-pressure air barrier, so that a medium in the inner cavity is prevented from leaking to the atmospheric environment. The method solves the problem that a traditional method is limited in measuring points and cannot adapt to the supercritical carbon dioxide medium environment, and can also be used for pressure distribution testing of other high-pressure and special medium hydrostatic bearings.

The present application relates to the technical field of wheel production, and particularly relates to an automatic transfer and stacking device for wheels, comprising: a mobile bearing platform, comprising a mobile chassis and an omnidirectional moving mechanism arranged at the bottom of the mobile chassis, and a central storage groove arranged on the mobile chassis and used for temporarily storing wheels. The present application mainly comprises the mobile bearing platform and a conveying and stacking mechanism arranged above the mobile bearing platform. The omnidirectional moving mechanism is used for flexible walking. The central storage groove is arranged at the center of the mobile bearing platform and used for temporarily storing wheels. The conveying and stacking mechanism is driven by a lifting and horizontal moving assembly to position a clamping and conveying assembly. The clamping and conveying assembly comprises a pair of clamping guide frames with adjustable spacing and clamping conveying belts arranged on the clamping guide frames. The clamping and conveying assembly is used for stably clamping and horizontally conveying wheels. The clamping and conveying assembly can clamp wheels and temporarily store the wheels in the central storage groove. The transfer and stacking functions are integrated. The second handling step by a forklift is omitted. The central storage groove is used for batch transfer. The transfer efficiency from a production line to a warehouse is improved.

The application discloses a kind of charging and discharging device and control method thereof, belong to pure electric engineering machinery energy supplement field, charging and discharging device includes mobile bearing unit, mobile bearing unit is detachably installed with platform assembly, platform assembly is provided with electrical assembly and thermal management system;Electrical assembly is used for electrical energy storage, electrical energy input and output conversion and electrical energy monitoring;Thermal management system is connected with electrical assembly, for monitoring and controlling the temperature of electrical assembly.Through setting mobile bearing unit, the mobility of the device is realized, the use limit of traditional charging equipment in remote areas is solved, and the outdoor work scene of small-tonnage pure electric excavator is adapted, and the platform assembly is detachably installed on the mobile bearing unit, when the work area that the mobile bearing unit cannot pass is encountered, the module formed by the mobile bearing unit, the platform assembly, the electrical assembly and the thermal management system can be disassembled, and the module is transported, and the adaptability to different work environments is improved.

The application discloses a kind of automatic loading machine of packing box, it is related to loading machine technical field, including mobile bearing machine shell, and sequentially arranged in mobile bearing machine shell on packing box conveying direction feed unit, whole column unit, push unit and unloading unit, the top of the unloading unit is equipped with first bearing surface, and the side adjacent to the whole column unit of first bearing surface is equipped with push execution mechanism, characterized in that, the unloading unit includes the temporary storage platform with containing cavity inside, and the containing cavity is equipped with the bearing mechanism that can be horizontally telescopic along packing box conveying direction;The bearing mechanism includes linear module, bearing plate and attitude adjustment component.The application changes the falling process of packing box from traditional free falling to controllable sliding by innovative bearing plate inclination guide structure, i.e., attitude adjustment component drives bearing plate to slowly deflect to inclination state around pivot shaft, lets packing box slide along inclined bearing surface smoothly, and greatly weakens falling impact.

The invention discloses a two-way bearing plane moving bearing which comprises a loading shaft, a bearing end cover, balls, a retainer, a supporting plate, a gasket and a locking nut. The ball is restrained between the bearing end cover and the supporting plate through the retainer; the bearing end cover, the supporting plate, the retainer and the gasket are connected together through the loading shaft and are integrally pre-tightened through the locking nut. Motion decoupling of the vibration table of the centrifugal machine can be achieved, vibration can be effectively transmitted in the axial direction, follow-up can be conducted in the radial direction, and good guidance quality is achieved; the centrifugal machine vibration table adopting the bidirectional bearing plane moving bearing is simple in composition and compact in structure, and can solve the oil leakage problem of a hydrostatic pressure bearing and the problems of energy consumption and control nonlinearity caused by a laminated rubber bearing.

An actuator assembly comprising: a support structure; a movable part that is movable relative to the support structure; a bearing arrangement arranged to guide movement of the movable part relative to the support structure parallel to a primary axis; and at least one actuating unit configured to apply an actuating force to a connection point of either the movable part or the support structure. The actuating unit comprising: a force-modifying unit; a coupling link connected between the force-modifying unit and the connection point; and an SMA element connected between the force-modifying unit and the support structure. On actuation of the SMA element: the SMA element is configured to apply an input force to the force-modifying unit; the force-modifying unit is configured to modify the input force so as to give rise to the actuating force applied to the connection point; and the actuating unit is configured to move the movable part in a direction parallel to the primary axis.