Gantry milling equipment for maintaining power battery pack

Abstract

The invention relates to gantry milling equipment for maintenance of a power battery pack, which comprises a gantry frame, which is composed of two base assemblies arranged in parallel and a cross beam assembly erected on the two base assemblies; the main shaft assembly is mounted on the cross beam assembly; the battery pack positioning assembly is arranged on the ground below the gantry frame and comprises a trolley assembly used for bearing and clamping a battery pack; the trolley assembly can move to the battery pack positioning assembly and achieve automatic locking. The main shaft assembly comprises a laser range finder used for detecting the surface height of the battery pack and can conduct follow-up milling according to the detection result. According to the invention, a quick-change scheme of the moving trolley and pneumatic zero-point positioning is adopted, so that quick positioning and clamping of the large battery pack are realized, the traditional hoisting and alignment time is greatly shortened, and the maintenance efficiency is greatly improved. According to the invention, the back water-cooling plate of the battery pack can be quickly milled, and the non-destructive disassembly of the battery cell is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power battery processing, in particular to a gantry milling equipment for power battery pack maintenance. BACKGROUND

[0002] With the increasing number of new energy household cars, the battery pack bottom water cooling plate needs to be removed before replacing and disassembling the module battery cell. The removal of the water cooling plate requires special milling equipment for processing. Some existing general gantry mills mostly have fixed worktables, and the milling depth cannot follow the milling (the battery pack surface has concave bulging deformation). It is easy to mill the battery and cause leakage and fire safety accidents. The general gantry mill has a long feeding and discharging cycle, and the hoisting of feeding and discharging affects the processing efficiency and the cost of the general gantry mill is high, which is difficult for ordinary automobile repair shops to bear high costs. Some violent disassembly methods use manual polishing and cutting disassembly, which easily damages the module battery cell and is low in efficiency.

[0003] In view of the above defects, the present application actively researches and innovates to create a gantry milling equipment for power battery pack maintenance, so as to have more industrial use value. SUMMARY

[0004] To solve the above technical problems, the purpose of the present application is to provide a gantry milling equipment for power battery pack maintenance.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] The gantry milling equipment for power battery pack maintenance comprises:

[0007] The gantry frame is composed of two parallelly arranged base assemblies and a crossbeam assembly arranged on the two base assemblies;

[0008] The main shaft assembly is installed on the crossbeam assembly;

[0009] The battery pack positioning assembly is arranged on the ground below the gantry frame, which comprises a trolley assembly for carrying and clamping the battery pack;

[0010] The trolley assembly can be moved to the battery pack positioning assembly and automatically locked; the main shaft assembly comprises a laser range finder for detecting the surface height of the battery pack, and can follow the milling according to the detection results.

[0011] As a further improvement of the present application, the crossbeam assembly comprises a crossbeam, a first linear guide rail pair is installed on the crossbeam and fixed by a guide rail pressing block; tail bearing seats and head bearing seats are respectively installed at both ends of the crossbeam, and a first ball screw is installed between the two bearing seats; a first screw nut is assembled on the first ball screw and connected with an X-axis servo motor through a first coupling;

[0012] The main shaft assembly is slidably connected with the first linear guide rail pair through a sliding plate, and the sliding plate is connected with the first screw nut; an upper bearing seat and a lower bearing seat are installed on the sliding plate, and a second ball screw is installed between the two bearing seats; a second screw nut is assembled on the second ball screw, and the second screw nut is connected with a Z-axis servo motor through a second coupling.

[0013] As a further improvement of the present application, the main shaft assembly further comprises a main shaft and a Z-axis ram, the Z-axis ram is slidably connected with the sliding plate through a third linear guide rail pair, and is connected with a first nut seat on the second screw nut; the main shaft is installed on the Z-axis ram through a main shaft seat, and is connected with a main shaft motor through a fourth coupling; a tool is installed on the main shaft; a laser range finder is installed on the Z-axis ram; a tool loosening cylinder and a tool loosening button are also installed on the Z-axis ram.

[0014] As a further improvement of the present application, each base assembly comprises a bed base, a second linear guide rail pair is installed on the bed base; a front bearing seat and a rear bearing seat are fixed at both ends of the bed base, and a third ball screw is installed between the two bearing seats; a third screw nut is assembled on the third ball screw, and is connected with a Y-axis servo motor through a third coupling; a sliding seat is slidably connected with the second linear guide rail pair, and is connected with the third screw nut; both ends of the cross beam assembly are fixed on the sliding seats of the two base assemblies; a plurality of foot adjusting plates are arranged at the bottom of the bed base.

[0015] As a further improvement of the present application, the trolley assembly comprises a trolley frame, casters are installed at the bottom of the trolley frame, insulating cushion blocks for supporting the battery pack and pressing plate assemblies for pressing the battery pack are arranged at the top of the trolley frame; a plurality of draw lugs are also installed at the bottom of the trolley frame.

[0016] As a further improvement of the present application, a trolley locking mechanism is further provided, which comprises a support cross beam fixed on the ground, a plurality of pneumatic zero-point positioning discs matched with the draw lugs, a guide plate for guiding the trolley assembly, and a hard limiting block for limiting.

[0017] As a further improvement of the present application, an electric power-assisted lifting forklift is further provided, which is used to move the trolley assembly and realize the rapid feeding and discharging of the battery pack.

[0018] As a further improvement of the present application, an electric control console and an oil cooler are further provided; the electric control console is electrically connected with the X-axis servo motor, the Y-axis servo motor, the Z-axis servo motor, the main shaft motor, the laser range finder and the pneumatic zero-point positioning disc, and is used to control the operation of the equipment and the follow-up milling function; the oil cooler is used to cool the main shaft assembly.

[0019] By the above-mentioned scheme, the present application at least has the following advantages:

[0020] This invention employs a quick-change scheme using a mobile trolley and pneumatic zero-point positioning, enabling rapid positioning and clamping of large battery packs. This significantly reduces the time required for traditional hoisting and alignment, greatly improving maintenance efficiency.

[0021] This invention can quickly mill the water-cooling plate on the back of the battery pack, enabling non-destructive disassembly of the battery cells.

[0022] This invention is compatible with milling deformed and bulging battery packs, and is equipped with a distance-measuring follow-up milling system, making it safe and efficient.

[0023] The large-span gantry structure of this invention is compatible with battery packs of different sizes. The equipment is designed for specialized and modular applications in maintenance scenarios. It uses a high-rigidity cast iron base to ensure stability, while eliminating the complex functions and high costs of general-purpose machine tools, making it easy to popularize in repair shops.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the following are preferred embodiments of the present invention described in detail with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a gantry milling machine for repairing a power battery pack according to the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the middle crossbeam assembly;

[0028] Figure 3 yes Figure 1 Schematic diagram of the middle base assembly;

[0029] Figure 4 yes Figure 3 A magnified schematic diagram of the local structure;

[0030] Figure 5 yes Figure 1 A schematic diagram of the structure of the battery pack positioning component;

[0031] Figure 6 yes Figure 5 Schematic diagram of the locking mechanism for small and medium-sized vehicles;

[0032] Figure 7 yesFigure 5 Schematic diagram of the structure of the small and medium-sized vehicle components;

[0033] Figure 8 yes Figure 1 A schematic diagram of the structure of the spindle assembly.

[0034] The meanings of the labels in the figures are as follows.

[0035] Base assembly 1, crossbeam assembly 2, spindle assembly 3, battery pack positioning assembly 4, electrical control panel 5, oil cooler 6, crossbeam 7, first linear guide pair 8, guide rail pressure block 9, tail bearing seat 10, first ball screw 11, first screw nut 12, head bearing seat 13, first coupling 14, X-axis servo motor 15, Z-axis servo motor 16, second coupling 17, upper bearing seat 18, slide plate 19, second screw nut 20, first nut seat 21, second ball screw 22, lower bearing seat 23, bed base 24, front bearing seat 25, second linear guide pair 26, third ball screw 27, slide 28. 29. Rear bearing housing, 30. Third coupling, 31. Y-axis servo motor, 32. Foot adjustment plate, 33. Second nut seat, 34. Third lead screw nut, 35. Pressure plate assembly, 36. Battery pack, 37. Trolley assembly, 38. Trolley locking mechanism, 39. Insulating pad, 40. Electric power lifting forklift, 41. Support beam, 42. Guide plate, 43. Hard limit block, 44. Pneumatic zero-point positioning plate, 45. Frame, 46. Tie rod, 47. Casters, 48. Main spindle motor, 49. Fourth coupling, 50. Main spindle, 51. Cutting tool, 52. Tool clamping cylinder, 53. Third linear guide pair, 54. Z-axis slide, 55. Tool release button, 56. Laser rangefinder, 57. Detailed Implementation

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] First embodiment of the present invention:

[0039] like Figure 1 The gantry milling machine for power battery pack maintenance in this embodiment mainly includes a gantry frame, a spindle assembly 3, a battery pack positioning assembly 4, an electrical control panel 5, and an oil cooler 6.

[0040] The gantry frame consists of two parallel base components 1 and a crossbeam component 2 mounted on top of them.

[0041] like Figure 2 The crossbeam assembly 2 includes a crossbeam 7, on which a first linear guide pair 8 is mounted and fixed by a guide rail clamping block 9; a tail bearing seat 10 and a head bearing seat 13 are respectively mounted at its two ends, and a first ball screw 11 is mounted therebetween and fitted with a first screw nut 12, and connected to an X-axis servo motor 15 via a first coupling 14. The spindle assembly 3 is slidably connected to the first linear guide pair 8 via a slide plate 19, and the slide plate 19 is connected to the first screw nut 12. An upper bearing seat 18 and a lower bearing seat 23 are mounted on the slide plate 19, and a second ball screw 22 is mounted therebetween and fitted with a second screw nut 20, and connected to a Z-axis servo motor 16 via a second coupling 17.

[0042] like Figure 8 The spindle assembly 3 also includes a spindle 51 and a Z-axis slide 55. The Z-axis slide 55 is slidably connected to the slide plate 19 via a third linear guide pair 54 and connected to the first nut seat 21 on the second lead screw nut 20. The spindle 51 is mounted on the Z-axis slide 55 via a spindle seat 50 and is connected to the spindle motor 48 via a fourth coupling 49. The cutting tool 52 is mounted on the spindle 51. The laser rangefinder 57 is mounted on the Z-axis slide 55 to detect the surface height of the battery pack 36, thereby realizing the follow-up milling function. The Z-axis slide 55 is also equipped with a tool release cylinder 53 and a tool release button 56 for tool release.

[0043] like Figure 3 and Figure 4 Each base assembly 1 includes a bed base 24 on which a second linear guide pair 26 is mounted; a front bearing seat 25 and a rear bearing seat 29 are fixed at both ends of the bed base 24 respectively, a third ball screw 27 is installed therebetween and fitted with a third screw nut 34, and is connected to the Y-axis servo motor 31 through a third coupling 30; a slide 28 is slidably connected to the second linear guide pair 26 and connected to the third screw nut 34, and both ends of the crossbeam assembly 2 are fixed to the slides 28 of the two base assemblies 1; the bottom of the bed base 24 is provided with several foot adjustment plates 32.

[0044] like Figures 5 to 7 The battery pack positioning component 4 is located on the ground below the gantry frame, and its core is the trolley component 37 used to support and clamp the battery pack 36.

[0045] likeFigure 5 and Figure 7 The vehicle assembly 37 includes a frame 45, with casters 47 mounted on the bottom of the frame 45, and an insulating pad 39 for supporting the battery pack 36 and a pressure plate assembly 35 for pressing the battery pack on the top; the bottom of the frame 45 is also equipped with a plurality of rivets 46.

[0046] like Figure 6 The equipment also includes a trolley locking mechanism 38, which has a support beam 41 fixed to the ground. Multiple pneumatic zero-point positioning discs 44 that cooperate with pull studs 46, a guide plate 42 for guiding the trolley assembly 37, and a hard limit block 43 for limiting movement are mounted on the support beam 41. This allows the trolley assembly 37 to move onto the battery pack positioning assembly 4 and achieve automatic locking. For ease of handling, the equipment is also equipped with an electric-assisted lifting forklift 40, which allows for the rapid loading and unloading of the battery pack 36 by moving the trolley assembly 37.

[0047] The electrical control panel 5 is electrically connected to the X-axis servo motor 15, Y-axis servo motor 31, Z-axis servo motor 16, spindle motor 48, laser rangefinder 57, and pneumatic zero-point positioning disk 44 for centralized control of the equipment's operation and follow-up milling function; the oil cooler 6 is used to cool the high-speed rotating spindle assembly 3.

[0048] The second embodiment of the present invention:

[0049] like Figures 1 to 8 As shown, this embodiment provides a dedicated milling machine capable of quickly clamping various large battery packs and efficiently milling them. The spindle assembly is equipped with a laser rangefinder sensor to detect the surface deformation of the product. The Z-axis mills according to the product deformation, preventing overcutting and damage to the battery cells to avoid fire accidents. A mobile trolley loading and unloading scheme is adopted, where other standby trolleys simultaneously clamp the product while milling. Electric-assisted forklifts can be used for rapid loading and unloading, or AGV trolleys can be used for automatic loading and unloading, with the product fixed on a pallet trolley. The product clamping can accommodate battery packs with a maximum width of 1.8 meters, a length of 2.5 meters, and a thickness of 0.4 meters, demonstrating high product specification compatibility.

[0050] This embodiment describes a gantry milling machine for repairing power battery packs, specifically:

[0051] like Figure 1 The crossbeam assembly 2 is mounted on the two base assemblies 1 and connected to the second linear guide pair 26; the spindle assembly 3 is mounted on the crossbeam assembly 2 and connected to the first linear guide pair 8. The battery pack positioning assembly 4 is fixed to the ground, the oil cooler 6 for spindle cooling is placed on the ground, and the electrical control panel 5 is placed on the ground.

[0052] like Figure 2Two first linear guide pairs 8 are mounted on the crossbeam 7; guide rail clamping blocks 9 press the first linear guide pairs 8 together. Tail bearing housing 10 and head bearing housing 13 are respectively mounted on the crossbeam 7. First ball screw 11 is mounted on tail bearing housing 10 and head bearing housing 13. First screw nut 12 is mounted on first ball screw 11 and slide plate 19. X-axis servo motor 15 is mounted on head bearing housing 13. First coupling 14 is mounted on first ball screw 11 and X-axis servo motor 15. Lower bearing housing 23 and upper bearing housing 18 are respectively mounted on slide plate 19. Second ball screw 22 is mounted on lower bearing housing 23 and upper bearing housing 18. Z-axis servo motor 16 is mounted on upper bearing housing 18. Second coupling 17 is mounted on second ball screw 22 and Z-axis servo motor 16. Second screw nut 20 is mounted on first nut seat 21 and second ball screw 22. First nut seat 21 is mounted on Z-axis slide ram 55.

[0053] like Figure 3 and Figure 4 The front bearing housing 25 and the rear bearing housing 29 are respectively fixed on the bed base 24. The Y-axis servo motor 31 is mounted on the rear bearing housing 29. The third ball screw 27 is mounted on the front bearing housing 25 and the rear bearing housing 29. The third coupling 30 is mounted on the rear bearing housing 29 and the Y-axis servo motor 31. The second linear guide pair 26 is mounted on the bed base 24. The slide 28 is mounted on the two second linear guide pairs 26. The foot adjusting plate 32 is mounted on the bed base 24 and fixed to the ground. The third screw nut 34 is mounted on the third ball screw 27 and the second nut seat 33. The second nut seat 33 is mounted on the slide 28.

[0054] like Figure 8 The machine uses a mechanical spindle 51, which has high cutting force and low maintenance cost. The cutting tool 52 is mounted on the spindle 51, the spindle 51 is mounted on the spindle seat 50, and the spindle seat 50 is mounted on the Z-axis slide 55. The spindle motor 48 is mounted on the spindle seat 50, the fourth coupling 49 is mounted on the spindle motor 48 and the spindle 51, the tool release cylinder 53 is mounted on the Z-axis slide 55, two third linear guide pairs 54 are mounted on the Z-axis slide 55, the tool release button 56 is mounted on the Z-axis slide 55, and the laser rangefinder 57 is mounted on the Z-axis slide 55.

[0055] like Figure 5 The battery pack 36 is placed flat on the trolley assembly 37, and four pressure plate assemblies 35 are installed on the trolley assembly 37 to press the battery pack 36 firmly. Four insulating shims 39 support the battery pack 36, and the trolley assembly 37 is placed on the trolley locking mechanism 38 using an electric-assisted lifting forklift 40.

[0056] like Figure 6Two supporting beams 41 are fixed to the ground, six guide plates 42 are fixed on the two supporting beams 41 respectively, two hard limit blocks 43 are installed on the two supporting beams 41 respectively, and six pneumatic zero-point positioning discs 44 are installed on the two supporting beams 41. The six pneumatic zero-point positioning discs 44 and six pull studs 46 automatically lock to fix the carriage assembly, ensuring that it does not shake during milling.

[0057] like Figure 7 Four casters 47 are mounted on the frame 45, and six rivets 46 are mounted on the frame 45.

[0058] The main spindle assembly 3 of the equipment is raised to the maximum safe height. The customer uses an electric-assisted lifting forklift 40 to place the trolley assembly 37 on the trolley locking mechanism 38. The electric-assisted lifting forklift 40 descends and exits the processing area. At the same time, the six pneumatic zero-point positioning plates 44 automatically lock the six pull studs 46 to fix the trolley assembly. The main spindle assembly descends to set the tool and perform processing. After processing, the electric-assisted lifting forklift 40 is used to lift the trolley assembly 37 and move it out of the processing area. Unprocessed products are quickly pushed in to achieve rapid unloading and loading.

[0059] The X-axis direction mentioned in this article is as follows: Figure 1 The left and right directions, the Y-axis direction is as follows Figure 1 The front and back of the middle, the Z-axis direction is as follows Figure 1 The vertical direction in the middle.

[0060] This invention employs a quick-change solution using a mobile trolley and pneumatic zero-point positioning, enabling rapid positioning and clamping of large battery packs. This significantly reduces the time required for traditional hoisting and alignment, greatly improving maintenance efficiency. It can quickly mill the water-cooling plate on the back of the battery pack, achieving non-destructive cell disassembly. It is compatible with milling deformed and bulging battery packs, equipped with a distance-measuring follow-up milling system, ensuring safety and efficiency. The large-span gantry structure is compatible with battery packs of different sizes. The equipment is designed with specialization and modularity for maintenance scenarios, using a high-rigidity cast iron base to ensure stability. It also eliminates the complex functions and high costs of general-purpose machine tools, facilitating widespread adoption in repair shops.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A gantry milling device for the repair of a traction battery pack, characterized in that The application relates to a gantry frame, which is composed of two parallelly arranged base assemblies (1) and a crossbeam assembly (2) arranged on the two base assemblies (1); a main shaft assembly (3) is arranged on the crossbeam assembly (2); a battery pack positioning assembly (4) is arranged on the ground below the gantry frame, which comprises a trolley assembly (37) for bearing and clamping a battery pack (36); wherein the trolley assembly (37) can be moved to the battery pack positioning assembly (4) and automatically locked; the main shaft assembly (3) comprises a laser range finder (57) for detecting the surface height of the battery pack (36) and can follow the milling according to the detection result. The crossbeam assembly (2) comprises a crossbeam (7), a first linear guide rail pair (8) is arranged on the crossbeam (7) and fixed through a guide rail pressing block (9); tail bearing seats (10) and head bearing seats (13) are arranged at the two ends of the crossbeam (7) respectively, and a first ball screw (11) is arranged between the two bearing seats; a first screw nut (12) is arranged on the first ball screw (11) and connected with an X-axis servo motor (15) through a first coupling (14). The main shaft assembly (3) is slidably connected with the first linear guide rail pair (8) through a sliding plate (19), and the sliding plate (19) is connected with the first screw nut (12); an upper bearing seat (18) and a lower bearing seat (23) are arranged on the sliding plate (19), a second ball screw (22) is arranged between the two bearing seats, a second screw nut (20) is arranged on the second ball screw (22) and connected with a Z-axis servo motor (16) through a second coupling (17). The main shaft assembly (3) further comprises a main shaft (51) and a Z-axis slide ram (55), the Z-axis slide ram (55) is slidably connected with the sliding plate (19) through a third linear guide rail pair (54) and connected with a first nut seat (21) on the second screw nut (20); the main shaft (51) is arranged on the Z-axis slide ram (55) through a main shaft seat (50) and connected with a main shaft motor (48) through a fourth coupling (49); a cutter (52) is arranged on the main shaft (51); a laser range finder (57) is arranged on the Z-axis slide ram (55); a cutter loosening cylinder (53) and a cutter loosening button (56) are further arranged on the Z-axis slide ram (55). ​ 2. The gantry milling apparatus for servicing a power battery pack according to claim 1, characterized in that, ​ ​ 3. The gantry milling apparatus for servicing a power battery pack according to claim 2, wherein ​ 4. The gantry milling apparatus for servicing a power battery pack according to claim 1, wherein Each of the base assemblies (1) comprises a machine bed base (24) on which a second linear guide pair (26) is mounted; the two ends of the machine bed base (24) are respectively fixed with a front bearing seat (25) and a rear bearing seat (29) and a third ball screw (27) is installed between the two; the third ball screw (27) is assembled with a third screw nut (34) and connected with a Y-axis servo motor (31) through a third coupling (30); a sliding seat (28) is in sliding connection with the second linear guide pair (26) and connected with the third screw nut (34), and the two ends of the beam assembly (2) are fixed on the sliding seats (28) of the two base assemblies (1); the bottom of the machine bed base (24) is provided with a plurality of foot adjusting plates (32).

5. The gantry milling apparatus for servicing a power battery pack according to claim 1, wherein The trolley assembly (37) comprises a frame (45), the bottom of the frame (45) is mounted with casters (47), the top of the frame (45) is provided with an insulating cushion block (39) for supporting the battery pack (36) and a pressing plate assembly (35) for pressing the battery pack (36); the bottom of the frame (45) is further mounted with a plurality of pull pins (46).

6. The gantry milling apparatus for servicing a power battery pack according to claim 5, wherein It also comprises a trolley locking mechanism (38) comprising a support beam (41) fixed to the ground, a plurality of pneumatic zero-point positioning discs (44) cooperating with the pull pins (46), a guide plate (42) for guiding the trolley assembly (37) and a hard limit block (43) for limiting are mounted on the support beam (41).

7. The gantry milling apparatus for servicing a power battery pack according to claim 1, wherein It also comprises an electric power-assisted lifting forklift (40), which is used to move the trolley assembly (37) and realize the rapid feeding and discharging of the battery pack (36).

8. The gantry milling apparatus for servicing a power battery pack according to claim 1, wherein It also comprises an electrical control console (5) and an oil cooler (6); the electrical control console (5) is electrically connected with the X-axis servo motor (15), the Y-axis servo motor (31), the Z-axis servo motor (16), the main shaft motor (48), the laser range finder (57) and the pneumatic zero-point positioning disc (44) for controlling the operation and follow-up milling function of the equipment; the oil cooler (6) is used to cool the main shaft assembly (3).

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