Battery box and bottom support locking device for battery replacement of commercial vehicle

Abstract

The invention discloses a battery box and bottom support locking device for battery replacement of a commercial vehicle in the technical field of electric vehicle battery replacement, which comprises a plurality of locking devices mounted on a battery bracket and a battery box frame locked on the battery bracket through the locking devices, the locking device comprises a bottom plate, a shell, a driving device, a lifting mechanism and a mushroom head check block rotating device. The driving device, the lifting mechanism and the mushroom head check block rotating device are fixedly connected to the bottom plate through the shell, the driving device drives the mushroom head check block rotating device through the lifting mechanism to achieve lifting and rotating actions, and the problem that in the prior art, a hinged type locking mechanism cannot achieve self-locking is solved; and meanwhile, the problem of how to judge unlocking and locking of the device is further solved, and the device can be used for battery replacement of commercial tramcars and electric trucks.

Description

Technical Field

[0001] The present invention relates to the technical field of battery replacement for electric vehicles, and in particular to a battery box and a bottom bracket locking device. Background Art

[0002] At present, the battery swap mode is often used in electric heavy trucks to replace the battery compartment to quickly replenish the battery energy. There are also many ways to swap batteries, and the top swap is currently the main one. The specific operation steps are: first, the truck drives into the charging station in the dedicated battery swap station, and the lifting equipment lifts the low-power battery compartment away, and then lifts the fully charged battery compartment onto the truck. After that, a locking device is needed to fix the battery compartment to the bracket below.

[0003] There are many types of existing electric heavy-duty truck battery compartment locking devices. For example, a heavy-duty truck locking device assembly with force sensing is disclosed in the patent with announcement number CN115817267. The cylinder piston rod is extended and retracted, so that the middle pull rod drives the left pressure plate and the right pressure plate to rise or fall. When the middle pull rod drives the left pressure plate and the right pressure plate to rise, the pressure plate is away from the battery compartment frame. When the middle pull rod drives the left pressure plate and the right pressure plate to fall, the pressure plate is close to the battery compartment frame.

[0004] The above-mentioned prior art has no self-locking structure. To keep the device in a certain position, it is necessary to continuously provide pressure to the cylinder, which requires the press to work all the time, consuming unnecessary energy. In addition, the above-mentioned technology uses strain gauges to monitor the force to make locking judgments, and cannot provide feedback on whether the unlocking is in place. In addition, the range of force is relatively vague when judging whether it is locked based on the force, which is not conducive to accurate judgment.

[0005] Therefore, a new technical solution is needed to solve the above problems. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a battery box and base locking device for commercial vehicle battery replacement, so as to solve the problem in the prior art that the articulated locking mechanism cannot achieve self-locking, and further solve the problem of how to determine whether the device is unlocked and locked.

[0007] The objective of the present invention is achieved as follows: A battery box and base locking device for commercial vehicle battery replacement comprises a plurality of locking devices mounted on a battery bracket and a battery box frame locked on the battery bracket via the locking devices, wherein the locking device comprises a base plate, a shell, a driving device, a lifting mechanism, and a mushroom head stopper rotating device; the driving device, the lifting mechanism, and the mushroom head stopper rotating device are fixedly connected to the base plate via the shell, and the driving device drives the mushroom head stopper rotating device via the lifting mechanism to realize lifting and rotating actions.

[0008] Furthermore, the mushroom head stopper rotating device includes a support shaft fixedly connected to the upper end of the lifting mechanism, a pair of mushroom head stops hinged on the support shaft, a pair of long cylindrical pins passing through the two mushroom head stops longitudinally, a pair of short cylindrical pins cooperating with the guide plate, a pair of connecting rods connecting the long cylindrical pins and the short cylindrical pins, and a torsion spring installed on the support shaft and in contact with the bottom of the two mushroom head stops, wherein the torsion spring is used to open the two mushroom head stops to a flush state without being subject to other external forces.

[0009] Furthermore, the long cylindrical pin, short cylindrical pin and connecting rod are symmetrically distributed with the lifting mechanism as the axis; the two mushroom-head blocks can rotate around the support shaft at a set angle, and the torsion springs are symmetrically placed on the support shaft; there are two pairs of guide plates, which are arranged on both sides of the lifting mechanism, and the guide plates are provided with slots for the short cylindrical pins to slide up and down; when the lifting mechanism rises and the short cylindrical pin has not reached the slot limit position, the entire device rises as a whole, and when the short cylindrical pin reaches the edge of the slot, the short cylindrical pin no longer rises; as the lifting mechanism drives the support shaft to continue to rise, the long cylindrical pin makes a circular arc motion within a certain range with the short cylindrical pin as the center, driving the mushroom-head block to both rise with the support shaft and rotate around the axis, thereby reducing the angle between the two blocks and shortening the linear distance occupied; when the lifting mechanism descends, the two mushroom-head blocks gradually rotate to a horizontal state under the action of the torsion springs, and then move downward with the lifting mechanism as a whole.

[0010] Furthermore, the battery box frame is provided with a support plate that cooperates with the locking device, and a slot is opened at the center of the support plate. The length of the slot is greater than the length of the mushroom head block, and the width of the slot is less than the total width when the two blocks are in a horizontal state but greater than the total width when the two mushroom head blocks are rotated to a retracted state. When the mushroom head block is in the unlocked position, the block can pass through the support plate, and when the block is in the locked position, the ends of the two mushroom head blocks are respectively pressed on the support plate.

[0011] Furthermore, a rectangular hole is punched in the middle of the end surface of the mushroom head stopper.

[0012] Furthermore, the driving device includes a motor, an active spiral bevel gear transmission-connected to the motor output shaft, and a driven spiral bevel gear fixedly sleeved on the outer periphery of the lifting mechanism. The active spiral bevel gear is meshingly connected with the driven spiral bevel gear, and the lifting mechanism is driven to lift and lower through the rotation of the driven spiral bevel gear.

[0013] Furthermore, the motor output shaft is transmission-connected to the active spiral bevel gear via an impact wrench assembly, and the impact wrench assembly comprises an impact frame, a striking block, and a rotating spindle. The motor output shaft is tightly connected to the impact frame, and the striking block is mounted on the rotating spindle and placed in the impact frame. The front end of the rotating spindle is key-connected to the active spiral bevel gear. The rotating spindle has two shaft sections that radially cooperate with the impact frame. When the motor encounters greater resistance during rotation, the impact wrench assembly uses the impact block to strike the rotating spindle to generate the required impact torque.

[0014] Furthermore, the lifting mechanism includes a sleeve shaft axially fixed in the shell hole, a screw rod passing through the axis of the sleeve shaft and spirally matched with it, and a guide limit sleeve fixedly connected to the upper end of the shell. The driven spiral bevel gear is fixedly sleeved on the outer periphery of the sleeve shaft, and the sleeve shaft is driven by a motor to rotate, thereby driving the screw rod to perform lifting and lowering actions.

[0015] Furthermore, the sleeve shaft is axially fixed in the hole of the shell, the screw rod passes through the center hole of the sleeve shaft, the middle section of the screw rod is elliptical, the lower section is threaded and connected to the sleeve shaft thread, and the middle section of the guide limit sleeve is equipped with an elliptical hole; the sleeve shaft, the guide limit sleeve and the screw rod are coaxial, and the elliptical shaft section of the screw rod and the elliptical hole of the guide limit sleeve are always matched during the lifting process, thereby limiting the rotation of the screw rod.

[0016] Furthermore, a hole with a diameter greater than the major axis length of the elliptical part of the screw is punched at the upper end of the sleeve shaft, and a shaft shoulder is processed. The shaft shoulder is clamped between the tapered roller bearing and the thrust ball to axially position the sleeve shaft and transmit the axial force.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention drives the sleeve shaft to rotate through the rotation of the motor, so that the lead screw can move up and down, thereby driving the support shaft and the mushroom head block to rise and fall, and through the mushroom head block rotating device, a part of the support shaft is lifted and lowered to drive the mushroom head block to rotate around the axis, forming a locking or unlocking between the mushroom head block and the battery support plate; the present invention uses the self-locking property of the lead screw and the lead screw nut itself to maintain the locking posture, and the self-locking structure is rigid self-locking and is less affected by external forces or vehicle bumps. At the same time, the device of the present invention only needs one motor, and then the mechanical structure can realize the composite action of lifting and lowering the mushroom head lock tongue and rotating around the main axis, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 is a layout diagram of a battery box locking device assembly for an electric heavy truck provided in an embodiment of the present invention; Figure 2 This is a state diagram of the battery bracket and the battery box frame in the embodiment of the present invention when they are matched; Figure 3 It is a schematic diagram of the structure of the locking device of an embodiment of the present invention, and shows a state diagram of the mushroom head stopper and the support plate during the locking process.

[0020] Figure 4 It is a schematic structural diagram from another angle of the locking device of an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the driving device of an embodiment of the present invention (without housing).

[0022] Figure 6 It is a cross-sectional view of the lifting mechanism of the embodiment of the present invention (without the housing).

[0023] Figure 7 1 is a state diagram of the mushroom head stopper of the lock tongue and the support plate when the lock tongue is unlocked according to the embodiment of the present invention.

[0024] Figure 8 It is a state diagram of the mushroom head stopper of the lock tongue and the support plate during the locking process of the embodiment of the present invention.

[0025] Fig. 9 It is a cross-sectional view of the entire locking device according to an embodiment of the present invention.

[0026] In the figure: 1. battery bracket; 2. quick-change connector; 3. locking device; 31. bottom plate; 32. housing; 33. driving device; 331. motor; 332. flange; 333. sealing ring; 334. impact frame; 335. striking block; 336. driven spiral bevel gear; 337. rotating spindle; 338. driving spiral bevel gear; 339. spindle sleeve; 3310. copper gasket; 34. lifting mechanism; 341. screw rod; 342. guide limit sleeve; 343 , thrust ball bearing; 344, sleeve shaft; 345, axial positioning sleeve; 346 tapered roller bearing, 347 guide plate; 349, O-ring; 348, housing end cover; 35, mushroom head stopper rotating device; 351, mushroom head stopper; 352, support shaft; 353, long cylindrical pin; 354, short cylindrical pin; 355, connecting rod; 356, torsion spring; 357, copper bushing; 358, copper oil nozzle; 359, proximity switch; 4, battery box; 41, support plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0028] like Figure 1-2 A battery box and base locking device for battery replacement in a commercial vehicle is shown, which are spaced apart on the inner side of the frame of a battery bracket 1. The number of devices is at least four and at most ten, and is not limited to the arrangement of four sets of locking devices shown in this embodiment. The middle position of the battery bracket 1 is a quick-change connector 2 connected to the battery pack.

[0029] like Figures 3 to 8 The battery bracket 1, the battery box frame 4, and the locking devices 3 installed on the battery bracket 1 are shown. The locking device includes a bottom plate 31, a shell 32, a driving device 33, a lifting mechanism 34, and a mushroom head block rotating device 35; the driving device 33 drives the driven spiral bevel gear 336 to rotate, and the gear 336 drives the sleeve shaft 344 to rotate; the lifting mechanism 34 includes a sleeve shaft 344 axially fixed in the shell 32, a screw rod 341 passing through the sleeve shaft 344 and spirally matched with it, and a guide limit sleeve 342 fixed to the upper end of the shell 32, and the elliptical shaft section of the screw rod 341 and the elliptical hole of the guide limit sleeve 342 are always matched during the lifting process, so as to limit the rotation of the screw rod 341; the shell 32 is fixed on the bottom plate 31; the bottom plate 31 is fixed to the inner side of the frame of the battery bracket 1, and can be connected by bolts or welding to ensure reliable connection strength.

[0030] The sleeve shaft 344 is fixed axially, and the guide limit sleeve 342 is screwed to the upper end of the shell 32. The motor 331 drives the gear to rotate to drive the sleeve shaft 344 to make forward and reverse movements; through the screw nut pair transmission, the screw rod 341 is restricted from rotating and can only move up and down; this mechanism can control the direction of the sleeve shaft 344 to make the screw rod 341 rise or fall axially.

[0031] The mushroom head stopper rotating device 35 comprises a pair of mushroom head stoppers 351 hinged on a support shaft 352, a support shaft 352 threadedly connected to the upper end of the screw rod 341, a pair of long cylindrical pins 353 integrally passing through the longitudinal direction of the mushroom head stoppers 351, a pair of short cylindrical pins 354 matched with the notches of the guide plate 347 at the top of the guide limiting sleeve 342, a pair of connecting rods 355 connecting the long cylindrical pins 353 and the short cylindrical pins 354, and a torsion spring 356 installed on the support shaft 352 and in contact with the bottom of the two mushroom head stoppers 351. A through hole with a smaller diameter is provided on the mushroom head stopper 351 for placing the long cylindrical pin 353, and through holes are provided at both ends of the connecting rod 355, through which the long cylindrical pin 353 and the short cylindrical pin 354 pass respectively, and the short cylindrical pin 354 is placed in the notch of the guide plate 347 and can move in the notch; Figure 7 As shown, when the screw rod 341 rises and the short cylindrical pin 354 does not reach the limiting position at the upper end of the slot, the entire device rises as a whole. When the short cylindrical pin 354 reaches the upper edge of the slot, the short cylindrical pin 354 stops rising. As the screw rod 341 drives the support shaft 352 to rise, the long cylindrical pin 353 makes a circular arc motion within a certain range with the short cylindrical pin 354 as the center, causing the mushroom head stopper 351 to rise with the support shaft 352 and to rotate around the axis of the short cylindrical pin 354, so that the angle between the two mushroom head stoppers 351 is reduced, the linear distance they occupy is shortened, and they are in an unlocked state. Figure 8 As shown, when the screw rod 341 descends, the two mushroom head blocks 351 gradually rotate to a horizontal state under the action of the torsion spring 356, and then the entire device moves downward as a whole until it is in a locked state.

[0032] A support plate 41 cooperating with the locking device is provided on the battery box frame 4, and a notch is opened at the center of the support plate 41. The length of the notch is greater than the length of the mushroom head stopper 351, and the width of the notch is less than the total width of the two mushroom head stoppers 351 when they are in a horizontal state but greater than the total width of the two mushroom head stoppers 351 when they are rotated to a smaller angle. When the mushroom head stoppers 351 are in the unlocking position, the mushroom head stoppers 351 can pass through the support plate 41, and the lifting and lowering processes do not interfere with each other; when the mushroom head stoppers 351 are in the locking position, the ends of the two mushroom head stoppers 351 are respectively pressed on the support plate 41 to achieve locking.

[0033] See also Figure 5The driving device 33 includes a motor 331, an impact frame 334 mounted on the motor shaft, a striking block 335 placed in the impact frame 334, an active spiral bevel gear 338 key-connected to the rotating main shaft 337, a driven spiral bevel gear 336 connected to the sleeve shaft 344, and a main shaft sleeve 339 sleeved on the cylindrical section of the pinion gear 338 and tightly matched with the housing 32; the motor 331 is connected to the flange 332 by screws, and the motor 331 is fixedly installed on the housing 32 by the flange 332 and the sealing ring 333, the top of the housing 32 is fixed to the bottom plate 31 by screws, the active spiral bevel gear 338 is axially fixed by the shaft shoulder, and the main shaft sleeve 339 is radially fixed and used for support. The large gear 336 is installed on the sleeve shaft 344 by key connection, and the shaft end is fixed by the end cover 348.

[0034] like Figure 5 As shown, the driving device 33 also includes a copper gasket 3310, which is placed between the motor 331 and the impact frame 334 to adjust the degree of meshing between the two bevel gears; Figure 6 and Fig. 9 As shown, the lifting mechanism 34 also includes a pair of tapered roller bearings 346, a thrust ball bearing 343, an axial positioning sleeve 345, and an O-ring 349. The tapered roller bearing 346 is mainly used to bear radial force and reduce friction; the thrust ball bearing 343 is in contact with the housing 32 and mainly bears a large axial force; the axial positioning sleeve 345 is used to fix the axial position of the driven spiral bevel gear 336; the O-ring 349 is placed in the rectangular groove opened by the guide limit sleeve 342 to seal the screw rod 341 and the inside of the housing 32. The rotating device 35 also includes a copper oil nozzle 358 installed on both sides of the support shaft 352 for providing lubricating oil to the device, and a copper shaft sleeve 357 sleeved on the support shaft 352 is used for lubrication between the support shaft 352 and the mushroom head block 351 to prevent wear caused by dry grinding. The proximity switch 359 installed in the mushroom head block 351 is used to determine whether the device is unlocked. An oil passage is drilled in the support shaft 352, and a rectangular groove is opened at a corresponding position of the mushroom head stopper 351 for storing oil.

[0035] The specific working steps of the embodiment of the present invention are as follows: when the vehicle is parked at the battery replacement station, the driver operates the "unlock" button, and the motor 331 drives the driven spiral bevel gear 336 through the active spiral bevel gear 338, thereby driving the sleeve shaft 344 to rotate forward, and the screw rod 341 is raised through the spiral fit, and the screw rod 341 drives the support shaft 352, the mushroom head stopper 351, the long cylindrical pin 353, the short cylindrical pin 354 and the connecting rod 355 to translate and rise as a whole. When the short cylindrical pin 354 rises to the upper edge of the notch of the guide plate 347 (rectangular column), At this time, the short cylindrical pin 354 is fixed, but the screw rod 341 continues to drive the support shaft 352 to rise synchronously. In this process, due to the action of the connecting rod 355, the long cylindrical pin 353 makes a certain range of arc motion with the short cylindrical pin 354 as the center, causing the mushroom head block 351 to rise with the support shaft 352 and rotate around the axis, so that the angle between the two mushroom head blocks is reduced, and the linear distance occupied is shortened. A mushroom head block is installed with a proximity switch 359 inside. When it is rotated into place, the switch is activated, the motor power is cut off, and unlocking is achieved. After unlocking is completed, the total width of a pair of mushroom head blocks 351 is less than the width of the slot of the support plate 41, and it can pass through it without blocking the support plate 41 of the battery box, allowing the crane to lift the battery box 4 from above. Afterwards, the empty battery box is replaced by a fully charged battery box under the action of the crane. Afterwards, the driver operates the "lock" button, and the motor 331 drives the sleeve shaft 344 to reverse, causing the screw rod 341 to move downward. During the descent of the screw rod 341, the mushroom head block 351 first descends with the support shaft 352, and rotates around the axis to open to a horizontal state, after which the entire rotating device moves downward as a whole until the mushroom head block 351 presses the support plate 41. When the mushroom head block 351 begins to contact the support plate 41, due to the impact wrench assembly, the motor 331 will be temporarily blocked when the torque is insufficient, and the current will increase to a higher value for a short time. After that, the motor 331 continues to rotate, and the current will decrease. The impact block 335 in the impact wrench structure quickly strikes the rotating spindle 337, generating a momentary large torque. The above actions are repeated several times to ensure that the mushroom head block presses the support plate. The number of times the motor current suddenly increases can be monitored by a sensor to control the cutting off of the motor power supply, so as to achieve the locking of the device. The device is provided with a self-locking clamping force by the screw nut to prevent the device from loosening during the driving process.

[0036] The device of the present invention has a simple structure, self-locking capability, and higher safety. After the locking is completed, the power supply of the drive motor is turned off, which can save electric energy and ensure that the truck has a higher endurance. In addition, the locking device of the present invention has a stepless locking capability and can be locked at any position within the travel range. Therefore, the lock tongue can adapt to the height error of different battery boxes, and can achieve reliable crimping and locking for any battery box, avoiding the gap between the mushroom head block and the support plate, eliminating the hidden danger of battery box shaking. Furthermore, the present invention presses the mushroom head block symmetrically from both sides, which can eliminate the unilateral deflection torque and prevent severe unilateral wear. Therefore, the present invention has a longer service life.

[0037] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A battery box and base locking device for commercial vehicle battery replacement, comprising a plurality of locking devices (3) mounted on a battery bracket (1) and a battery box (4) frame locked on the battery bracket (1) via the locking devices (3), characterized in that: The locking device (3) comprises a base plate (31), a shell (32), a driving device (33), a lifting mechanism (34), and a mushroom head stopper rotating device (35); the driving device (33), the lifting mechanism (34), and the mushroom head stopper rotating device (35) are fixedly connected to the base plate (31) via the shell (32); the driving device (33) drives the mushroom head stopper rotating device (35) via the lifting mechanism (34) to achieve lifting and rotating actions.

2. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 1, characterized in that: The mushroom head stopper rotating device (35) comprises a support shaft (352) fixedly connected to the upper end of the lifting mechanism (34), a pair of mushroom head stoppers (351) hinged on the support shaft (352), a pair of long cylindrical pins (353) passing through the two mushroom head stoppers (351) in the longitudinal direction, a pair of short cylindrical pins (354) cooperating with the guide plate (347), a pair of connecting rods (355) connecting the long cylindrical pins (353) and the short cylindrical pins (354), and a torsion spring (356) mounted on the support shaft (352) and in contact with the bottoms of the two mushroom head stoppers (351), wherein the torsion spring (356) is used to open the two mushroom head stoppers (351) to a flush state without being subjected to other external forces.

3. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 2, characterized in that: The long cylindrical pin (353), the short cylindrical pin (354) and the connecting rod (355) are all symmetrically distributed around the lifting mechanism (34); the two mushroom head stoppers (351) can rotate at a set angle around the support shaft (352), and the torsion springs (356) are symmetrically placed on the support shaft (352); two pairs of guide plates (347) are provided, which are arranged on both sides of the lifting mechanism (34); the guide plates (347) are provided with notches for the short cylindrical pin (354) to slide up and down; when the lifting mechanism (34) rises and the short cylindrical pin (354) has not reached the limit position of the notch, the entire device rises as a whole, and when the short cylindrical pin (354) reaches the limit position of the notch, the entire device rises as a whole. When the cylindrical pin (354) reaches the edge of the notch, the short cylindrical pin (354) stops rising; as the lifting mechanism (34) drives the support shaft (352) to continue rising, the long cylindrical pin (353) moves in a certain range of arcs with the short cylindrical pin (354) as the center, driving the mushroom head block (351) to rise with the support shaft (352) and to rotate around the axis, thereby reducing the angle between the two blocks and shortening the linear distance occupied; when the lifting mechanism (34) descends, the two mushroom head blocks (351) gradually rotate to a horizontal state under the action of the torsion spring (356), and then move downward as a whole with the lifting mechanism (34).

4. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 3, characterized in that: The battery box (4) frame is provided with a support plate (41) that cooperates with the locking device (3); a notch is provided at the center of the support plate (41); the length of the notch is greater than the length of the mushroom head stopper (351); the width of the notch is less than the total width of the two stoppers when they are in a horizontal state but greater than the total width of the two mushroom head stoppers (351) when they are rotated to a retracted state; when the mushroom head stoppers (351) are in an unlocked position, the stoppers can pass through the support plate (41); when the stoppers are in a locked position, the ends of the two mushroom head stoppers (351) are respectively pressed against the support plate (41).

5. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 4, characterized in that: A rectangular hole is punched in the middle of the end surface of the mushroom head stopper (351).

6. A battery box and base locking device for commercial vehicle battery replacement according to any one of claims 1-5, characterized in that: The driving device (33) comprises a motor (331), a driving spiral bevel gear (338) drivingly connected to an output shaft of the motor (331), and a driven spiral bevel gear (336) fixedly sleeved on the outer periphery of the lifting mechanism (34); the driving spiral bevel gear (338) is meshingly connected with the driven spiral bevel gear (336), and the lifting mechanism (34) is driven to move up and down through the rotation of the driven spiral bevel gear (336).

7. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 6, characterized in that: The output shaft of the motor (331) is connected to the active spiral bevel gear (338) via an impact wrench assembly. The impact wrench assembly comprises an impact frame (334), a striking block (335), and a rotating main shaft (337). The output shaft of the motor (331) is tightly connected to the impact frame (334). The striking block (335) is mounted on the rotating main shaft (337) and placed in the impact frame (334). The front end of the rotating main shaft (337) is key-connected to the active spiral bevel gear (338). The rotating main shaft (337) has two shaft sections that are radially matched with the impact frame (334). When the rotation of the motor (331) is subject to greater resistance, the impact wrench assembly uses the striking block to strike the rotating main shaft (337) to generate a required impact torque.

8. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 6, characterized in that: The lifting mechanism (34) comprises a sleeve shaft (344) axially fixed in a hole of a housing (32), a screw rod (341) passing through the axis of the sleeve shaft (344) and spirally engaged therewith, and a guide limit sleeve (342) fixedly connected to the upper end of the housing (32); the driven spiral bevel gear (336) is fixedly sleeved on the outer circumference of the sleeve shaft (344), and the sleeve shaft (344) is driven by a motor (331) to rotate, thereby driving the screw rod (341) to perform a lifting action.

9. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 8, characterized in that: The sleeve shaft (344) is axially fixed in the hole of the housing (32); the screw rod (341) passes through the central hole of the sleeve shaft (344); the middle section of the screw rod (341) is elliptical; the lower section is threaded and threadedly connected to the sleeve shaft (344); the middle section of the guide limit sleeve (342) is matched with an elliptical hole; the sleeve shaft (344), the guide limit sleeve (342) and the screw rod (341) are coaxial; the elliptical shaft section of the screw rod (341) and the elliptical hole of the guide limit sleeve (342) are always matched during the lifting process, thereby limiting the rotation of the screw rod (341).

10. A battery box and bottom bracket locking device for commercial vehicle battery replacement according to claim 9, characterized in that: The upper end of the sleeve shaft (344) is punched with a hole having a diameter greater than the length of the major axis of the elliptical portion of the screw rod (341), and a shaft shoulder is processed. The shaft shoulder is clamped between the tapered roller bearing (346) and the thrust ball to axially position the sleeve shaft (344) and transmit axial force.

Images