Lifting device and battery replacing station

Abstract

The lifting device comprises a lifting table and a hydraulic lifting mechanism with an outer cylinder and a telescopic unit, the telescopic unit is provided with a plurality of telescopic components and connected with the lifting table, and an oil inlet and outlet cavity is formed between the telescopic unit and the outer cylinder; in any two adjacent telescopic components nested together, the telescopic component located on the outer side is set as an outer telescopic component, the telescopic component located on the inner side is set as an inner telescopic component, an outer oil storage cavity is defined by the outer side of the outer telescopic component, an inner oil storage cavity is defined by the inner side of the outer telescopic component and the inner telescopic component, and the inner oil storage cavity communicates with the outer oil storage cavity; when oil enters the oil inlet and outlet cavity, the outer telescopic component is driven to stretch upwards to compress the outer oil storage cavity, oil in the outer oil storage cavity is supplemented into the inner oil storage cavity, and then the inner oil storage cavity expands to drive the inner telescopic component to stretch upwards synchronously. The lifting device can generate stable and continuously changing lifting driving force, the coordination is good, shaking is reduced or avoided, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of lifting equipment, and in particular to a lifting device and a battery swap station. Background Art

[0002] Hydraulic lifting devices are widely used in all walks of life. The requirements for control accuracy are getting higher and higher, and the hazards caused by vibration and impact during the working process are gradually receiving attention.

[0003] Taking the battery swapping of electric vehicles as an example, the battery swapping station is an important carrier of the battery swapping technology, and the hydraulic lifting device is also widely used in the battery swapping station. The vehicle-carrying platform is a key component in the battery swapping technology of electric vehicles. After the vehicle enters and is positioned on the vehicle-carrying platform, the relevant equipment of the battery swapping station performs the operation of replacing the battery pack. After the electric vehicle enters the battery swapping station and is positioned, the battery swapping equipment of the battery swapping station enters the battery swapping room from the charging room and replaces the battery of the electric vehicle. At present, from the electric vehicle entering the battery swapping room to the battery swapping equipment performing the battery swapping operation, and then to the electric vehicle that has completed the battery swapping leaving the battery swapping station, during this whole process, the electric vehicle needs a lifting device to raise or lower it. The lifting device includes a lifting platform for carrying the battery swapping vehicle. The raising and lowering of the lifting platform is realized by a scissor mechanism and a hydraulic lifting mechanism that provides lifting and lowering driving force. In the existing lifting devices used in battery swapping stations, the hydraulic lifting mechanism mostly uses a multi-stage hydraulic cylinder. Compared with ordinary cylinders of the same size, the multi-stage hydraulic cylinder has a much longer working stroke than ordinary cylinders, and is suitable for working conditions where the installation space is limited and the telescopic stroke requirement is large.

[0004] At present, the oil circuits of each level of the multi-stage hydraulic cylinder are connected. When working, the oil pushes the cylinder body of each level step by step, and the extension speed is slow. The required oil pressure is large, which makes the oil chamber of each level of the cylinder body have too much impact when the oil is inlet, and the speed is too fast when the oil is returned. In addition, accompanied by the elastic effect of the oil, when the multi-stage cylinder is changed, the effective working area changes sharply, resulting in a sudden change in the system pressure and the cylinder movement speed, which is easy to cause hydraulic shock. The residual oscillation caused by the impact will cause the instability of the running speed of the multi-stage cylinder. The most obvious manifestation is the shaking of the lifting device, which in turn affects the working reliability and stability of the lifting device. In addition, in the lifting device, the lifting platform and the hydraulic lifting mechanism are hard-connected. When there is an angle deviation in the lifting platform during the lifting process, it is easy to cause the telescopic rod in the cylinder to deform, further aggravating the collision and vibration impact when the multi-stage cylinder is changed, affecting the working reliability and stability of the lifting device, and affecting the battery replacement process and experience. Utility Model Content

[0005] The present application provides a lifting device and a battery swap station to solve the technical problem of working instability caused by hydraulic shock when the hydraulic lifting mechanism of the existing lifting device is working.

[0006] The technical solution adopted in this application is:

[0007] A lifting device comprises a lifting platform and a hydraulic lifting mechanism capable of driving the lifting platform to move up and down, the hydraulic lifting mechanism comprising an outer cylinder and a telescopic unit arranged in the outer cylinder, the telescopic unit comprising a plurality of telescopic parts nested from the outside to the inside, the telescopic unit is connected to the lifting platform, and an inlet and outlet oil chamber is arranged between the telescopic unit and the outer cylinder; among any two adjacent telescopic parts nested together, the telescopic part located on the outside is set as the outer telescopic part, and the telescopic part located on the inside is set as the inner telescopic part, the outer side of the outer telescopic part forms an outer oil storage chamber, the inner side of the outer telescopic part and the inner telescopic part form an inner oil storage chamber, and the inner oil storage chamber is connected to the outer oil storage chamber; when the inlet and outlet oil chamber is filled with oil, the outer telescopic part is driven to extend upward and compress the outer oil storage chamber, so that the oil in the outer oil storage chamber is replenished into the inner oil storage chamber, and then the inner oil storage chamber is expanded to drive the inner telescopic part to extend upward synchronously to lift the lifting platform.

[0008] In the present technical solution, the telescopic unit of the hydraulic lifting mechanism is connected to the lifting platform, and the lifting stroke of the lifting platform is realized by the telescopic movement of the telescopic unit in the outer tube. Specifically, an oil inlet and outlet chamber is provided between the telescopic unit and the outer tube, and the oil inlet and outlet chamber is used for oil inlet and oil outlet. When the oil inlet and outlet chamber is filled with oil, the telescopic unit is extended out of the outer tube as a whole. The telescopic unit includes a plurality of telescopic components nested from the outside to the inside. For ease of understanding, in any two adjacent telescopic components nested together, the telescopic component located on the outside is set as an outer telescopic component, and the telescopic component located on the inside is set as an inner telescopic component. The inner and outer parts of the outer telescopic component are respectively surrounded by an inner oil storage chamber and an outer oil storage chamber. In the process of oil inlet and outlet of the oil chamber to make the telescopic unit as a whole extend from the outer tube, the outer oil storage chamber is compressed and the oil is replenished into the inner oil storage chamber, so that the inner telescopic component and the outer telescopic component are synchronously extended, that is, in the process of the outer telescopic component extending, the inner telescopic component is also extended from the outer telescopic component. Therefore, compared with the existing multi-stage hydraulic cylinder and multi-stage cylinder body that telescopes step by step, the hydraulic lifting mechanism in the present application only needs to pre-store an appropriate amount of hydraulic oil in the inner oil storage chamber and the outer oil storage chamber, and can realize the synchronous telescopic movement of all telescopic components by entering or discharging oil into or out of the oil chamber. During operation, the frequency of level change impact is effectively reduced, and the level change impact is minimized or even does not occur, avoiding speed oscillations and impacts caused by mechanical collision and level change, and helping to reduce the noise caused by impact when the lifting platform is lifted and lowered. The hydraulic lifting mechanism can also generate a stable and continuously changing driving force to drive the lifting platform to move up and down stably, ensuring the overall coordination of the lifting device rising or falling, reducing or avoiding shaking, and being able to optimize the product performance of the existing lifting device and increase its service life, thereby improving the reliability and stability of the battery swap station using the lifting device during the battery swap process, optimizing the battery swap process and improving the battery swap experience.

[0009] Preferably, the upper end of the telescopic unit supports the bottom surface of the lifting platform, and a flexible pad is provided between the upper end of the telescopic unit and the bottom surface of the lifting platform.

[0010] In the present technical solution, the hard connection between the existing hydraulic lifting mechanism and the lifting platform is changed to an adaptive connection through the flexible deformation performance of the flexible pad. Even if the lifting platform has an angle deviation during the lifting process due to processing errors, installation errors, and disturbances of the lifted object, the angle deviation can be automatically adjusted and compensated through appropriate deformation of the flexible pad, preventing the lifting platform from causing the telescopic unit to deform, ensuring that the driving force of the hydraulic lifting mechanism on the lifting platform changes stably, reducing the risk of hydraulic shock, and improving the working reliability and stability of the lifting device.

[0011] Preferably, the flexible pad has an upper plane extending horizontally and a lower spherical surface protruding downward in a spherical shape, the upper plane abuts against the bottom surface of the lifting platform, and the lower spherical surface abuts against the upper end of the telescopic unit.

[0012] In this technical solution, the flexible pad is against the bottom surface of the lifting platform through the upper plane to form a planar stable support, and is against the upper end of the telescopic unit through the lower spherical surface. The lower spherical surface has a strong adaptability to pressure in all circumferential directions. When the lifting platform produces angular deviations in different directions, it can achieve adjustment and compensation through the corresponding deformation of the lower spherical surface, thereby improving the overall applicability and coordination and ensuring the stability and reliability of the lifting device.

[0013] Preferably, a pit corresponding to the flexible pad is provided at the upper end of the telescopic unit, and a conical inclined surface surrounding the lower spherical surface is provided in the pit, so that the lower spherical surface abuts against the conical inclined surface when being confined in the pit.

[0014] In the technical solution, by limiting the lower spherical surface in the pit and abutting against the conical inclined surface, in the absence of pressure, line contact is formed between the lower spherical surface and the conical inclined surface, and the lower spherical surface has a deformation space with a larger degree of freedom relative to the conical inclined surface, thereby improving the adaptability of the deformation of the lower spherical surface during adjustment and compensation to the angle deviation of the lifting platform. Under the action of pressure, the lower spherical surface is adaptively deformed and the line contact with the conical inclined surface is changed to a stable surface contact, thereby improving the support stability. Moreover, under the limitation of the pit, it can also ensure that the flexible pad will not deviate in the radial direction and affect the adaptive adjustment effect.

[0015] Preferably, the lifting platform is provided with a through hole penetrating through the upper and lower ends at a position abutting against the telescopic unit, the lifting device also includes a bolt and a gasket, the telescopic unit is provided with a threaded hole, the bolt passes through the through hole and the flexible pad from top to bottom and is connected to the threaded hole to fix the telescopic unit and the lifting platform, and the gasket is located between the head of the bolt and the top surface of the lifting platform.

[0016] In this technical solution, the lifting platform and the telescopic unit are stably and reliably connected by bolts, thereby ensuring the strength of the connection between the hydraulic lifting mechanism and the lifting platform and ensuring the synchronization and stability of the telescopic movement of the telescopic unit and the lifting movement of the lifting platform.

[0017] Preferably, a bushing is provided in the through hole, and the bolt passes through the bushing.

[0018] In the present technical solution, on the one hand, the bushing protects the external thread of the bolt to prevent the external thread from being worn; on the other hand, the bushing and the bolt can be regarded as an integral structure, and the bushing compensates for the radial support of the bolt on the lifting platform in the through hole, so that the bolt has a thickening effect in the radial direction, thereby improving the pressure bearing capacity of the bolt and thus improving the connection reliability.

[0019] Preferably, the outer telescopic component is provided with an oil through hole connecting the outer oil storage chamber and the inner oil storage chamber; the oil through holes are symmetrically distributed on two opposite sides of the outer telescopic component, or the oil through holes are evenly distributed along the circumference of the outer telescopic component.

[0020] In the present technical solution, the oil holes are symmetrically distributed or evenly distributed circumferentially, so that when the telescopic unit makes an extension movement, the oil can be evenly replenished from the outer oil chamber to the inner oil chamber during the process of replenishing the oil from the outer oil chamber to the inner oil chamber. The oil flows evenly and stably, which helps to drive the inner telescopic component to extend stably, reduce the risk of hydraulic shock, and reduce the lifting platform's upward shaking. Similarly, when the telescopic unit makes a retraction movement, the oil can also be evenly replenished from both sides of the inner oil chamber to the outer oil chamber during the process of replenishing the oil from the inner oil chamber to the outer oil chamber. This helps to stably retract the inner telescopic component, reduce the risk of hydraulic shock, and reduce the lifting platform's downward shaking.

[0021] Preferably, the outer wall of the outer telescopic component is provided with a protruding sliding protrusion, and the sliding protrusion is used to guide the telescopic movement of the outer telescopic component. When the outer telescopic component extends, the sliding protrusion squeezes the oil in the outer oil storage chamber into the inner oil storage chamber.

[0022] In the present technical solution, the sliding protrusion guides the up and down sliding of the outer telescopic component to ensure sliding stability, and can serve as a force-applying structure for compressing the outer oil storage chamber during the extension movement of the outer telescopic component. At the same time, it serves as a pressure-bearing structure for bearing the oil pressure in the outer oil storage chamber during the retraction movement of the outer telescopic component, thus realizing multiple uses of one structure.

[0023] Preferably, the lifting device also includes a base and a scissor mechanism connecting the base and the lifting platform, the outer cylinder is fixed to the base, the hydraulic lifting mechanism drives the lifting platform to move up and down relative to the base, the base is provided with a mounting hole, the outer cylinder is provided with a flange ring extending in the circumferential direction, the outer cylinder is inserted into the mounting hole and is fixedly connected to the base through the flange ring.

[0024] In this technical solution, the base and the lifting platform are connected by a scissor mechanism, ensuring that the scissor mechanism performs scissor movement under the drive of the hydraulic lifting mechanism, so that the lifting platform can be lifted and lowered relative to the base. The outer cylinder is connected to the base through a flange ring, which, on the one hand, ensures the strength and reliability of the connection between the outer cylinder and the flange ring, and on the other hand, helps the outer cylinder to transfer the pressure of the lifted object to the base evenly through the flange ring in the circumferential direction, avoiding stress concentration, making the driving force change more stable, and helping to further reduce the risk of hydraulic shock by improving the working stability of the hydraulic lifting mechanism.

[0025] Preferably, the position of the bottom end surface of the outer cylinder in the vertical direction is lower than the position of the bottom end surface of the base in the vertical direction.

[0026] In this technical solution, by making the bottom end surface of the outer tube lower than the bottom end surface of the base, during the actual installation process, the part of the outer tube that is lower than the base can be buried below the ground supporting the base, and the outer tube is supported by the ground to form a stable supporting effect.

[0027] Preferably, the flange ring is provided with a positioning hole, the bottom of the outer cylinder is provided with a hydraulic oil inlet and outlet connected to the inlet and outlet oil chambers, and the hydraulic lifting mechanism also includes a hard oil pipe, one end of the hard oil pipe is connected to the hydraulic oil inlet and outlet, and the other end extends upward and passes through the positioning hole.

[0028] In this technical solution, a hard oil pipe is led upward from the hydraulic oil inlet and outlet to facilitate the connection between the external oil circuit and the hard oil pipe. Compared with soft pipes, hard oil pipes have high structural strength, are not easy to break, have strong pressure bearing capacity, and have a long service life. The hard oil pipe passes through the positioning hole and is positioned by the flange ring to prevent the hard oil pipe from loose shaking.

[0029] Preferably, the outer cylinder is provided with an exhaust hole communicated with the outer oil storage chamber, and the hydraulic lifting mechanism further comprises a cover for opening or closing the exhaust hole.

[0030] In the present technical solution, the outer cylinder is provided with an exhaust hole connected to the outer oil storage chamber, and the outer oil storage chamber is connected to the inner oil storage chamber, so that before the hydraulic lifting mechanism is put into use, the air in the outer oil storage chamber and the inner oil storage chamber can be conveniently discharged through the exhaust hole to avoid the air from adversely affecting the stable operation of the hydraulic lifting mechanism.

[0031] The present application provides a battery swap station, comprising the lifting device as described above.

[0032] In this technical solution, the battery swap station is equipped with the above-mentioned lifting device, and the battery swap vehicle can be parked on the lifting platform of the lifting device, and the lifting platform is driven by the hydraulic lifting mechanism to move up and down to assist the operation of the battery swap. The hydraulic lifting mechanism generates a stable and continuously changing driving force, driving the lifting platform to stably drive the battery swap vehicle to move up and down, optimizing the battery swap process and improving the battery swap experience.

[0033] Since the lifting device adopts the above technical solution, the technical effect achieved is: the telescopic unit of the hydraulic lifting mechanism is connected to the lifting platform, and the lifting stroke of the lifting platform is realized by the telescopic movement of the telescopic unit in the outer tube. Specifically, an inlet and outlet oil cavity is provided between the telescopic unit and the outer tube, and the inlet and outlet oil cavity is used for oil inlet and oil outlet. When the inlet and outlet oil cavity is filled with oil, the telescopic unit is extended from the outer tube as a whole. The telescopic unit includes a plurality of telescopic components nested from the outside to the inside. For ease of understanding, in any two adjacent telescopic components nested together, the telescopic component located on the outside is set as an outer telescopic component, and the telescopic component located on the inside is set as an inner telescopic component. The inner and outer parts of the outer telescopic component are respectively surrounded by an inner oil storage cavity and an outer oil storage cavity. In the process of oil inlet and outlet oil cavity to make the telescopic unit as a whole extend from the outer tube, the outer oil storage cavity is compressed and the oil is replenished into the inner oil storage cavity, so that the inner telescopic component and the outer telescopic component are synchronously extended, that is, in the process of the outer telescopic component extending, the inner telescopic component is also extended from the outer telescopic component. Therefore, compared with the existing multi-stage hydraulic cylinder and multi-stage cylinder body that retracts and extends step by step, the hydraulic lifting mechanism in the present application only needs to pre-store an appropriate amount of hydraulic oil in the inner oil storage chamber and the outer oil storage chamber, and can realize the synchronous retractable movement of all telescopic components by entering or discharging oil into or out of the oil chamber. During operation, the frequency of level change impact is effectively reduced, and the level change impact is minimized or even does not occur. The speed oscillation and impact caused by mechanical collision and level change are avoided, and a stable and continuously changing driving force is generated to drive the lifting platform to move up and down stably, thereby ensuring the overall coordination of the lifting device rising or falling, reducing or avoiding shaking, and being able to optimize the product performance of the existing lifting device and increase its service life, thereby improving the reliability and stability of the battery swap station using the lifting device during the battery swap process, optimizing the battery swap process and improving the battery swap experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of the lifting device provided in the embodiment of the present application Figure 1 ;

[0036] Figure 2 A schematic diagram of the structure of the lifting device provided in the embodiment of the present application Figure 2 ;

[0037] Figure 3 A schematic diagram of the structure of the hydraulic lifting mechanism provided in the embodiment of the present application;

[0038] Figure 4 A cross-sectional view of a hydraulic lifting mechanism provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the flow of oil in and out of the oil chamber under the oil inlet state provided by the embodiment of the present application;

[0040] Figure 6 A schematic diagram of the flow of oil in and out of the oil chamber in the oil discharge state provided by the embodiment of the present application;

[0041] Figure 7 A cross-sectional view of a lifting device provided in an embodiment of the present application;

[0042] Figure 8 for Figure 7 A partial enlarged view of the structure at A in the middle;

[0043] Fig. 9 The structure of the flexible pad provided in the embodiment of the present application is schematically shown in FIG. Figure 1 ;

[0044] Fig.10 The structure of the flexible pad provided in the embodiment of the present application is schematically shown in FIG. Figure 2 .

[0045] List of parts and reference numerals:

[0046] 1 lifting platform, 11 through holes;

[0047] 2 hydraulic lifting mechanism, 21 outer cylinder, 211 flange ring, 212 positioning hole, 213 hydraulic oil inlet and outlet, 214 exhaust hole, 22 oil inlet and outlet chamber, 23 outer telescopic component, 231 oil hole, 232 sliding convex part, 24 inner telescopic component, 241 pit, 242 conical inclined surface, 243 threaded hole, 25 outer oil storage chamber, 26 inner oil storage chamber, 27 hard oil pipe, 28 hexagonal joint, 29 cover;

[0048] 3 bolts;

[0049] 4 gaskets;

[0050] 5 bushing;

[0051] 6 bases, 61 mounting holes;

[0052] 7. Scissor mechanism;

[0053] 8 flexible pad, 81 upper plane, 82 lower spherical surface. DETAILED DESCRIPTION

[0054] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0056] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0058] In the embodiments of the present application, a lifting device is provided. For the convenience of explanation and understanding, the following contents provided in the present application are all explained on the basis of the illustrated product structure. Of course, it can be understood by those skilled in the art that the above structure is only used as a specific example and schematic description, and does not constitute a specific limitation on the technical solution provided in the present application. In addition, the present application also provides a battery swap station.

[0059] like Figures 1 to 10 As shown, a lifting device provided by the present application includes a lifting platform 1 and a hydraulic lifting mechanism 2 capable of driving the lifting platform 1 to move up and down, the hydraulic lifting mechanism 2 includes an outer cylinder 21 and a telescopic unit arranged in the outer cylinder 21, the telescopic unit includes a plurality of telescopic components nested from the outside to the inside, the telescopic unit is connected to the lifting platform 1, and an inlet and outlet oil chamber 22 is arranged between the telescopic unit and the outer cylinder 21; among any two adjacent telescopic components nested together, the telescopic component located on the outside is set as an outer telescopic component 23, and the telescopic component located on the inside is set as an inner telescopic component 24, the outer side of the outer telescopic component 23 encloses an outer oil storage chamber 25, the inner side of the outer telescopic component 23 and the inner telescopic component 24 enclose an inner oil storage chamber 26, and the inner oil storage chamber 26 is connected to the outer oil storage chamber 25; Figure 5 The arrows shown schematically indicate the flow of oil when the oil chamber 22 is filled with oil. When the oil chamber 22 is filled with oil, the outer telescopic component 23 is driven to extend upward to compress the outer oil storage chamber 25, so that the oil in the outer oil storage chamber 25 is replenished into the inner oil storage chamber 26, and then the inner oil storage chamber 26 is expanded to drive the inner telescopic component 24 to extend upward synchronously to lift the lifting platform 1. Accordingly, Figure 6 The arrows shown schematically represent the flow of oil when the oil inlet and outlet chamber 22 is in the oil discharge state. When the oil inlet and outlet chamber 22 is in the oil discharge state, the inner telescopic component 24 retracts downward into the outer telescopic component 23, the inner oil storage chamber 26 is compressed, and the oil in the inner oil storage chamber 26 is replenished into the outer oil storage chamber 25 to expand the outer oil storage chamber 25, thereby causing the outer telescopic component 23 to retract downward synchronously to drive the lifting platform 1 to descend.

[0060] It should be noted that the present application does not specifically limit the number of telescopic components included in the telescopic unit. Figure 2 and Figure 3Schematically depicts an embodiment in which the telescopic unit includes two telescopic components nested together, and the hydraulic lifting mechanism 2 forms a two-level hydraulic structure. Therefore, in this embodiment, the telescopic component located on the outside is the outer telescopic component 23, and the telescopic component located on the inside is the inner telescopic component 24. The outer oil storage chamber 25 is surrounded by the outer telescopic component 23 and the outer cylinder 21, and the inner oil storage chamber 26 is surrounded by the outer telescopic component 23 and the inner telescopic component 24. In other embodiments, when the number of telescopic components included in the telescopic unit is greater than two, any two adjacent telescopic components nested together can be set as the outer telescopic component and the inner telescopic component. Taking the telescopic unit including three telescopic components nested together as an example, the first telescopic component and the second telescopic component from the outside to the inside can be set as the outer telescopic component and the inner telescopic component respectively, and the second telescopic component and the third telescopic component can also be set as the outer telescopic component and the inner telescopic component respectively. The first telescopic component and the outer cylinder enclose an outer oil storage chamber, and the second telescopic component and the first telescopic component simultaneously enclose an isolated outer oil storage chamber and an inner oil storage chamber, and the third telescopic component and the second telescopic component only enclose an inner oil storage chamber. Specifically, the innermost telescopic component among all the telescopic components can be connected to the lifting platform 1, such as Figure 7 In the embodiment shown, in which the telescopic unit comprises two telescopic parts nested together, the inner telescopic part 24 is connected to the lifting platform 1 .

[0061] In the present application, the telescopic unit of the hydraulic lifting mechanism 2 is connected to the lifting platform 1, and the lifting stroke of the lifting platform 1 is realized by the telescopic movement of the telescopic unit in the outer cylinder 21. Specifically, an oil inlet and outlet chamber 22 is provided between the telescopic unit and the outer cylinder 21, and the oil inlet and outlet chamber 22 is used for oil inlet and oil outlet. When the oil inlet and outlet chamber 22 is filled with oil, the telescopic unit is extended from the outer cylinder 21 as a whole. The telescopic unit includes a plurality of telescopic components nested from the outside to the inside. For ease of understanding, of any two adjacent telescopic components nested together, the telescopic component located on the outside is set as an outer telescopic component 23, and the telescopic component located on the inside is set as an inner telescopic component 24. The outer telescopic component 23 is surrounded by an inner oil storage chamber 26 and an outer oil storage chamber 25 inside and outside, respectively. In the process of oil entering and exiting the oil chamber 22 to make the telescopic unit as a whole extend from the outer cylinder 21, the outer oil storage chamber 25 is compressed and the oil is replenished into the inner oil storage chamber 26, so that the inner telescopic component 24 and the outer telescopic component 23 are synchronously extended. That is, in the process of the outer telescopic component 23 extending, the inner telescopic component 24 is also extended from the outer telescopic component 23. Therefore, compared with the existing multi-stage hydraulic cylinder multi-stage cylinder body that telescopes step by step, the hydraulic lifting mechanism 2 in the present application only needs to pre-store an appropriate amount of hydraulic oil in the inner oil storage chamber 26 and the outer oil storage chamber 25, and can realize the synchronous telescopic movement of all telescopic components by entering or exiting the oil chamber 22. Figure 2The telescopic unit shown in the embodiment includes two telescopic parts nested together. When the outer telescopic part 23 extends from the outer tube 21, the inner telescopic part 24 extends from the outer telescopic part 23 synchronously. When the inner telescopic part 24 retracts into the outer telescopic part 23, the outer telescopic part 23 retracts into the outer tube 21 synchronously. Therefore, during the operation of the hydraulic lifting mechanism 2, the frequency of level change shock is effectively reduced through the synchronous telescopic movement of each telescopic part, and the level change shock is minimized or even does not occur, avoiding the speed oscillation and shock caused by mechanical collision level change, which helps to reduce the noise caused by the impact during the lifting and lowering movement of the lifting platform 1. The hydraulic lifting mechanism 2 can also generate a stable and continuously changing driving force to drive the lifting platform 1 to stably move up and down, ensuring the overall coordination of the lifting device rising or falling, reducing or avoiding shaking, and optimizing the product performance of the existing lifting device and increasing its lifespan, thereby improving the reliability and stability of the battery swap station using the lifting device during the battery swap process, optimizing the battery swap process and improving the battery swap experience.

[0062] As a preferred embodiment of the present application, Figures 7 to 10 As shown, the upper end of the telescopic unit supports the bottom surface of the lifting platform 1, and a flexible pad 8 is provided between the upper end of the telescopic unit and the bottom surface of the lifting platform 1. It can be understood by those skilled in the art that the flexible pad 8 is provided between the telescopic unit and the lifting platform 1, and the flexible deformation performance of the flexible pad 8 changes the hard connection between the existing hydraulic lifting mechanism and the lifting platform into a connection method with adaptive ability, so that even if the lifting platform 1 has an angle deviation during the lifting process due to the existence of processing errors, installation errors, and the disturbance of the lifted object, the angle deviation can be automatically adjusted and compensated through the appropriate deformation of the flexible pad 8, so as to prevent the lifting platform 1 from causing the telescopic unit to deform, ensure that the driving force of the hydraulic lifting mechanism 2 acting on the lifting platform 1 changes stably, reduce the risk of hydraulic shock, and improve the working reliability and stability of the lifting device. In a preferred embodiment, the flexible pad 8 can be a rubber pad or other suitable structure.

[0063] Specifically, the deformation posture of the flexible pad 8 depends on the deflection angle of the lifting platform 1. When the lifting platform 1 deflects in one direction, the deformation degree of the flexible pad 8 along the deflection direction of the lifting platform 1 should be greater. However, it is difficult to control the deformation direction and degree of the flexible pad 8. Therefore, in order to improve the adaptability of the deformation direction and degree of the flexible pad 8 to the deflection angle of the lifting platform 1, in a preferred embodiment, as shown in FIG. Figures 8 to 10As shown, the flexible pad 8 has an upper plane 81 extending horizontally and a lower spherical surface 82 protruding downward in a spherical shape. The upper plane 81 abuts against the bottom surface of the lifting platform 1, and the lower spherical surface 82 abuts against the upper end of the telescopic unit. In this technical solution, the flexible pad 8 abuts against the bottom surface of the lifting platform 1 through the upper plane 81 to form a stable planar support, and abuts against the upper end of the telescopic unit through the lower spherical surface 82. The lower spherical surface 82 has a strong adaptive ability to pressure in all directions in the circumferential direction, so that when the lifting platform 1 has an angular deviation in different directions, it can be adjusted and compensated by the deformation of the corresponding direction and the corresponding degree of deformation through the lower spherical surface 82, which improves the overall applicability and coordination and ensures that the lifting device is stable and reliable.

[0064] Furthermore, if Figure 4 and Figure 8 As shown, the upper end of the telescopic unit is provided with a pit 241 corresponding to the flexible pad 8, and a conical inclined surface 242 surrounding the lower spherical surface 82 is provided in the pit 241, so that the lower spherical surface 82 and the conical inclined surface 242 are abutted against each other when the lower spherical surface 82 is limited in the pit 241. In the technical solution, by making the lower spherical surface 82 abut against the conical inclined surface 242 when it is limited in the pit 241, under the action of no pressure, a line contact is formed between the lower spherical surface 82 and the conical inclined surface 242, and the lower spherical surface 82 has a deformation space with a large degree of freedom relative to the conical inclined surface 242, thereby improving the adaptability of the deformation of the lower spherical surface 82 to the angle deviation of the lifting platform 1 during adjustment and compensation. Under the action of pressure, after the lower spherical surface 82 is adaptively deformed, the line contact between the lower spherical surface 82 and the conical inclined surface 242 changes to a stable surface contact, thereby improving the support stability. Moreover, under the limitation of the pit 241, it can also ensure that the flexible pad 8 will not deviate in the radial direction and affect the adaptive adjustment effect.

[0065] In a preferred embodiment, Figure 7 and Figure 8 As shown, the lifting platform 1 is provided with a through hole 11 penetrating the upper and lower ends at the position against the telescopic unit, the lifting device also includes a bolt 3 and a gasket 4, the telescopic unit is provided with a threaded hole 243, the bolt 3 passes through the through hole 11 and the flexible pad 8 from top to bottom and is connected with the threaded hole 243 to fix the telescopic unit and the lifting platform 1, and the gasket 4 is located between the head of the bolt 3 and the top surface of the lifting platform 1. In this technical solution, the lifting platform 1 and the telescopic unit are stably and reliably connected by the bolt 3, the strength of the connection between the hydraulic lifting mechanism 2 and the lifting platform 1 is ensured, and the synchronization and stability of the telescopic movement of the telescopic unit and the lifting movement of the lifting platform 1 are ensured. Specifically, a hole for the bolt 3 to pass through can be set in the center of the flexible pad 8 to facilitate the connection of the bolt 3 with the threaded hole 243.

[0066] Furthermore, if Figure 8As shown, a bushing 5 is provided in the through hole 11, and the bolt 3 is passed through the bushing 5. In the technical solution, on the one hand, the bushing 5 protects the external thread of the bolt 3 to prevent the external thread from being worn, and on the other hand, the bushing 5 and the bolt 3 can be regarded as an integral structure, and the bushing 5 compensates for the radial support of the bolt 3 on the lifting platform 1 in the through hole 11, so that the bolt 3 has a thickening effect in the radial direction, improves the pressure bearing capacity of the bolt 3, and thus improves the connection reliability.

[0067] As a preferred embodiment of the present application, the outer telescopic component 23 is provided with an oil hole 231 that connects the outer oil storage chamber 25 and the inner oil storage chamber 26; Figure 4 As shown, the oil holes 231 are symmetrically distributed on two opposite sides of the outer telescopic part 23. The symmetrical distribution of the oil holes 231 allows the oil to be evenly replenished from both sides of the outer oil storage chamber 25 into the inner oil storage chamber 26 during the extension movement of the telescopic unit. The oil flows evenly and stably, which helps drive the inner telescopic part 24 to extend stably, reduces the risk of hydraulic shock, and reduces the lifting platform 1 from shaking as it rises. Similarly, when the telescopic unit retracts, the oil can also be evenly replenished from both sides of the inner oil storage chamber 26 into the outer oil storage chamber 25 during the retraction movement of the telescopic unit. The outer oil storage chamber 25 helps the inner telescopic part 24 to retract stably, reduces the risk of hydraulic shock, and reduces the lifting platform 1 from shaking as it descends.

[0068] In other embodiments, the oil holes can also be evenly distributed along the circumference of the outer telescopic component, so that the oil can be evenly replenished from the outer oil storage chamber to the inner oil storage chamber or from the inner oil storage chamber to the outer oil storage chamber, so that the telescopic unit can be stably extended and retracted and the hydraulic shock can be reduced.

[0069] As a preferred embodiment of the present application, Figure 4 As shown, the outer wall of the outer telescopic component 23 is provided with a protruding sliding protrusion 232, and the sliding protrusion 232 is used to guide the telescopic movement of the outer telescopic component 23. When the outer telescopic component 23 extends, the sliding protrusion 232 squeezes the oil in the outer oil storage chamber 25 into the inner oil storage chamber 26. In this technical solution, the sliding protrusion 232 guides the up and down sliding of the outer telescopic component 23 to ensure sliding stability, and can serve as a force-applying structure for compressing the outer oil storage chamber 25 during the extension movement of the outer telescopic component 23, and at the same time, it can serve as a pressure-bearing structure that bears the oil pressure in the outer oil storage chamber 25 during the retraction movement of the outer telescopic component 23, thus realizing multiple uses of one structure. Figure 4 In an embodiment in which the telescopic unit includes two telescopic components nested together, the sliding protrusion 232 of the outer telescopic component 23 abuts against the inner wall of the outer tube 21, and the sliding protrusion 232 isolates the outer oil storage chamber 25 from the inlet and outlet oil chamber 22. When the outer telescopic component 23 telescopes, the sliding protrusion 232 slides along the inner wall of the outer tube 21.

[0070] As a preferred embodiment of the present application, Figures 1 to 4 As shown, the lifting device also includes a base 6 and a scissor mechanism 7 connecting the base 6 and the lifting platform 1, the outer cylinder 21 is fixed to the base 6, the hydraulic lifting mechanism 2 drives the lifting platform 1 to move up and down relative to the base 6, the base 6 is provided with a mounting hole 61, the outer cylinder 21 is provided with a flange ring 211 extending along the circumferential direction, the outer cylinder 21 is inserted into the mounting hole 61 and is fixedly connected to the base 6 through the flange ring 211. In this technical solution, the base 6 and the lifting platform 1 are connected through the scissor mechanism 7 to ensure that the scissor mechanism 7 performs scissoring activities under the drive of the hydraulic lifting mechanism 2, so that the lifting platform 1 can move up and down relative to the base 6. The outer cylinder 21 is connected to the base 6 through the flange ring 211. On the one hand, the strength and reliability of the connection between the outer cylinder 21 and the flange ring 211 are ensured. On the other hand, it helps the outer cylinder 21 to transfer the pressure of the lifted object to the base 6 through the flange ring 211 in a circumferentially uniform manner, avoiding stress concentration, making the driving force change more stable, and helping to further reduce the risk of hydraulic shock by improving the working stability of the hydraulic lifting mechanism 2. In a preferred embodiment, the flange ring 211 can be fixedly connected to the base 6 by threaded fasteners to ensure connection reliability.

[0071] As a preferred embodiment of this implementation, Figure 1 and Figure 2 As shown, the position of the bottom end surface of the outer cylinder 21 in the vertical direction is lower than the position of the bottom end surface of the base 6 in the vertical direction. Those skilled in the art can understand that in the present technical solution, by making the bottom end surface of the outer cylinder 21 lower than the bottom end surface of the base 6, during the actual installation process, the part of the structure of the outer cylinder 21 lower than the base 6 can be buried below the ground (such as cement ground) supporting the base 6, and the outer cylinder 21 is supported by the ground to form a stable support effect.

[0072] As a preferred embodiment of this implementation, Figure 3 and Figure 4 As shown, the flange ring 211 is provided with a positioning hole 212, and the bottom of the outer cylinder 21 is provided with a hydraulic oil inlet and outlet 213 connected to the inlet and outlet oil chamber 22. The hydraulic lifting mechanism 2 also includes a hard oil pipe 27, one end of the hard oil pipe 27 is connected to the hydraulic oil inlet and outlet 213, and the other end extends upward and passes through the positioning hole 212. In this technical solution, the hard oil pipe 27 is led out upward from the hydraulic oil inlet and outlet 213 to facilitate the connection of the external oil circuit with the hard oil pipe 27. Compared with the soft pipe, the hard oil pipe 27 has high structural strength, is not easy to be damaged, has strong pressure bearing capacity, and has a long service life. The hard oil pipe 27 passes through the positioning hole 212 and is positioned by the flange ring 211 to prevent the hard oil pipe 27 from shaking freely.

[0073] In a preferred embodiment, the hard oil pipe 27 can be a metal oil pipe, such as a steel oil pipe. Figure 3 and Figure 4 As shown, a hexagonal joint 28 can be installed on the upper end of the hard oil pipe 27 to facilitate reliable connection between the hard oil pipe 27 and the external oil pipeline.

[0074] As a preferred embodiment of the present application, Figure 3 and Figure 4 As shown, the outer cylinder 21 is provided with an exhaust hole 214 communicating with the outer oil storage chamber 25, and the hydraulic lifting mechanism 2 further includes a cover 29 for opening or covering the exhaust hole 214. In the present technical solution, the outer cylinder 21 is provided with an exhaust hole 214 communicating with the outer oil storage chamber 25, and the outer oil storage chamber 25 is communicated with the inner oil storage chamber 26, so that before the hydraulic lifting mechanism 2 is put into use, it is convenient to discharge the air in the outer oil storage chamber 25 and the inner oil storage chamber 26 through the exhaust hole 214, so as to avoid the air from adversely affecting the stable operation of the hydraulic lifting mechanism 2. The exhaust hole 214 is blocked by the cover 29 to avoid internal oil leakage.

[0075] The present application provides a battery swap station, including a lifting device as described above. The battery swap station is used to replace the battery pack on the electric vehicle. After the electric vehicle that needs to replace the battery pack drives onto the lifting device, it is lifted by the lifting device and the battery pack replacement operation is performed. The electric vehicle drives out of the lifting device after the battery pack is replaced. In this technical solution, the battery swap station is provided with the above-mentioned lifting device, and the battery swap vehicle can be parked on the lifting platform of the lifting device. The lifting platform is driven up and down by the hydraulic lifting mechanism to assist the operation of the battery swap. During the operation of the hydraulic lifting mechanism, the frequency of level change shock is effectively reduced, and the level change shock is minimized or even does not occur, avoiding the speed oscillation and shock caused by mechanical collision level change, generating a stable and continuously changing driving force, driving the lifting platform to stably drive the battery swap vehicle to move up and down, optimizing the battery swap process and improving the battery swap experience.

[0076] In a preferred embodiment, two lifting devices as described above can be arranged at intervals along the front and rear directions in the battery swapping channel of the battery swapping station, namely a front lifting device and a rear lifting device. The front lifting device and the rear lifting device are respectively used to support the front wheels and rear wheels of the battery swapping vehicle. The front lifting device and the rear lifting device operate synchronously to drive the electric vehicle to rise and fall.

[0077] It should be noted that, since the electric vehicle provided in the present application includes the lifting device in any one of the above-mentioned implementation modes and examples, the beneficial effects of the lifting device are all included in the battery swap station provided in the present application and will not be elaborated here.

[0078] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0079] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0080] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A lifting device, comprising a lifting platform and a hydraulic lifting mechanism capable of driving the lifting platform to move up and down, characterized in that: The hydraulic lifting mechanism comprises an outer cylinder and a telescopic unit arranged in the outer cylinder, the telescopic unit comprises a plurality of telescopic components nested from the outside to the inside, the telescopic unit is connected to the lifting platform, and an oil inlet and outlet chamber is arranged between the telescopic unit and the outer cylinder; Among any two adjacent telescopic components nested together, the telescopic component located on the outside is set as an outer telescopic component, and the telescopic component located on the inside is set as an inner telescopic component, the outer side of the outer telescopic component forms an outer oil storage chamber, and the inner side of the outer telescopic component and the inner telescopic component form an inner oil storage chamber, and the inner oil storage chamber is connected to the outer oil storage chamber; when the inlet and outlet oil chambers are filled with oil, the outer telescopic component is driven to extend upward and compress the outer oil storage chamber, so that the oil in the outer oil storage chamber is replenished into the inner oil storage chamber, and then the inner oil storage chamber is expanded to drive the inner telescopic component to extend upward synchronously to lift the lifting platform.

2. The lifting device according to claim 1, characterized in that: The upper end of the telescopic unit supports the bottom surface of the lifting platform, and a flexible pad is provided between the upper end of the telescopic unit and the bottom surface of the lifting platform.

3. The lifting device according to claim 2, characterized in that: The flexible pad has an upper plane extending horizontally and a lower spherical surface protruding downward in a spherical shape, the upper plane abuts against the bottom surface of the lifting platform, and the lower spherical surface abuts against the upper end of the telescopic unit.

4. The lifting device according to claim 3, characterized in that: The upper end of the telescopic unit is provided with a pit corresponding to the flexible pad, and a conical inclined surface surrounding the lower spherical surface is provided in the pit, so that the lower spherical surface abuts against the conical inclined surface when being confined in the pit.

5. The lifting device according to claim 2, characterized in that: The lifting platform is provided with a through hole penetrating through the upper and lower ends at a position abutting against the telescopic unit. The lifting device also includes a bolt and a gasket. The telescopic unit is provided with a threaded hole. The bolt passes through the through hole and the flexible pad from top to bottom and is connected to the threaded hole to fix the telescopic unit and the lifting platform. The gasket is located between the head of the bolt and the top surface of the lifting platform.

6. The lifting device according to claim 5, characterized in that: A bushing is arranged in the through hole, and the bolt passes through the bushing.

7. The lifting device according to claim 1, characterized in that: The outer telescopic component is provided with an oil hole for connecting the outer oil storage cavity with the inner oil storage cavity; The oil holes are symmetrically distributed on two opposite sides of the outer telescopic component, or the oil holes are evenly distributed along the circumference of the outer telescopic component.

8. The lifting device according to claim 1, characterized in that: The outer wall of the outer telescopic component is provided with a protruding sliding protrusion, and the sliding protrusion is used to guide the telescopic movement of the outer telescopic component. When the outer telescopic component extends, the sliding protrusion squeezes the oil in the outer oil storage cavity into the inner oil storage cavity.

9. The lifting device according to claim 1, characterized in that: It also includes a base and a scissor mechanism connecting the base and the lifting platform, the outer cylinder is fixed to the base, the hydraulic lifting mechanism drives the lifting platform to move up and down relative to the base, the base is provided with a mounting hole, the outer cylinder is provided with a flange ring extending in the circumferential direction, the outer cylinder is inserted into the mounting hole and fixedly connected to the base through the flange ring.

10. The lifting device according to claim 9, characterized in that: The position of the bottom end surface of the outer cylinder in the vertical direction is lower than the position of the bottom end surface of the base in the vertical direction.

11. The lifting device according to claim 9, characterized in that: The flange ring is provided with a positioning hole, and the bottom of the outer cylinder is provided with a hydraulic oil inlet and outlet connected to the inlet and outlet oil chambers. The hydraulic lifting mechanism also includes a hard oil pipe, one end of which is connected to the hydraulic oil inlet and outlet, and the other end extends upward and passes through the positioning hole.

12. The lifting device according to claim 1, characterized in that: The outer cylinder is provided with an exhaust hole communicated with the outer oil storage chamber, and the hydraulic lifting mechanism also includes a cover for opening or covering the exhaust hole.

13. A battery swap station, characterized in that: Comprising a lifting device as described in any one of claims 1 to 12.

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