Large-tonnage hot coating accurate shifting device and method

Abstract

The large-tonnage hot coating accurate shifting device comprises a horizontal guide rail assembly and a vertical lifting assembly which are arranged on one side of a furnace body station, and the horizontal guide rail assembly comprises a rail arranged in the length direction of the furnace body station and a movable base walking along the rail; the movable base comprises a horizontal frame, first roller sets arranged on the two sides of the horizontal frame and a driving mechanism, the vertical lifting assembly is fixed to the upper portion of the horizontal frame and comprises a vertical grooved rail frame and a lifting frame, an electric hoist is arranged at the top end of the vertical grooved rail frame and connected with the lifting frame, and a bracket is fixed to the furnace body. A plurality of inserting holes are formed in the bracket, guide columns matched with the inserting holes are arranged on the lifting frame, the device further comprises a control unit for controlling the movable base and the lifting frame to move, a worker only needs to operate the control unit on a main console, rapid, stable and accurate displacement of the furnace body can be achieved, and the working efficiency and the safety are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine assembly, and in particular to a large-tonnage thermal coating precision shifting device and method. Background Art

[0002] Chemical vapor deposition (CVD) equipment is mainly used for depositing aluminide diffusion layers on the complex cooling cavities and flow channel surfaces of turbine blades. The equipment is based on four-station, dual-mode high-temperature reaction vapor deposition equipment. Its process requires frequent lifting of the heating furnace, high-temperature reactor and cooling tower, so that the furnace body moves repeatedly in the four stations; but the maximum weight of the furnace body is 5 tons, which is difficult to move. The existing crane occupies a large area and requires manual operation of the crane for lifting. It cannot be moved accurately and has low work efficiency. Secondly, the stability of the furnace body cannot be guaranteed during the movement, and safety cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a large-tonnage thermal coating precision shifting device and method to solve the above-mentioned problems.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A precise shifting mechanism for a large-tonnage hot coating device comprises a horizontal guide rail assembly arranged on one side of a furnace body station and a vertical lifting assembly slidably connected to the horizontal guide rail assembly, the horizontal guide rail assembly comprises a track arranged along the length direction of the furnace body station and a movable base moving along the track, the movable base comprises a horizontal frame, a roller group one arranged on both sides of the horizontal frame and a driving mechanism for driving the roller group one to move along the track, the vertical lifting assembly is fixed above the horizontal frame, the vertical lifting assembly comprises a vertical groove rail frame and a lifting frame, an electric hoist is provided at the top of the vertical groove rail frame, the electric hoist is connected to the lifting frame, a bracket is fixed on the furnace body, a plurality of sockets are provided on the bracket, and a guide column matching the sockets is provided on the lifting frame, the electric hoist pulls the lifting frame to move so that the guide column is inserted into the socket, thereby driving the furnace body to move up and down along the vertical groove rail frame.

[0006] In the above invention, further, the track is composed of two grooved guide rails and is fixed on the ground by chemical anchor bolts.

[0007] In the above invention content, further, a rack is provided on the inner surface of one of the groove-type guide rails, and the driving mechanism includes a driving motor arranged on a horizontal frame and a driving gear meshing with the rack, the output end of the driving motor passes through the side of the horizontal frame and is connected to the driving gear, the roller group is respectively placed in the groove-type guide rails on both sides, and the bottom of the vertical lifting assembly is fixedly connected to the four corners of the horizontal frame.

[0008] In the above invention content, further, the vertical groove rail frame includes two C-shaped groove guide rails and a cross beam connected to the top of the two C-shaped groove guide rails, the bottom ends of the two C-shaped groove guide rails are vertically welded to the horizontal frame, the electric hoist is fixed on the cross beam, and a plurality of rectangular steels are welded to the back of the C-shaped groove guide rails.

[0009] In the above invention content, further, the lifting frame is formed by connecting three horizontally arranged square steels and two side columns, and a roller group 2 is provided on the outer side of the side column. The roller group 2 is placed in the C-shaped groove guide rail and moves along the C-shaped groove guide rail, wherein at least two square steels are fixed with supports, and the guide column is fixed on the square steel through the support, and at least two brackets are also fixed on the furnace body. When the lifting frame is located at the bottom end of the vertical groove rail frame, the two square steels with the guide column are arranged at intervals with the two brackets.

[0010] In the above invention, further, a lifting frame for connecting with the electric hoist hook is fixed on one of the square steels.

[0011] In the above invention content, further, the precise shifting mechanism also includes a control unit, and the control unit includes a control circuit, a proximity sensing block and a position sensor. The proximity sensing block is fixed on the upper surface of the rack at a position corresponding to the furnace body workstation. The position sensor is fixed on the movable base and moves with the movable base to sense its position. The drive motor, the proximity sensing block and the position sensor are all electrically connected to the control circuit.

[0012] In the above invention content, further, the control unit also includes a proximity sensing block 2, a deceleration sensing block, a position sensor 2 and a photoelectric switch. The proximity sensing block 2 is fixed at the top and bottom ends of the side of the C-shaped groove guide rail. The deceleration sensing block is arranged at a certain position away from the proximity sensing block 2 and fixed on the side of the C-shaped groove guide rail. The position sensor 2 is fixed under the lifting frame, and the photoelectric switch is fixed on the top surface of the lifting frame. The proximity sensing block 2, the position sensor 2, the photoelectric switch and the electric hoist are all electrically connected to the control circuit.

[0013] A method for accurately shifting a large-tonnage thermal coating device comprises the following steps:

[0014] S1: The thermal coating device is arranged horizontally with two furnaces and four stations. The four stations are cooling tower station, heating furnace station, No. 1 station, and No. 2 station from left to right. The cooling tower station is regarded as the origin coordinate position. In the initial position, the vertical lifting assembly is located at the leftmost end of the horizontal guide rail assembly, and the guide column on the square steel is located directly below the socket on the pallet;

[0015] S2: By inputting movement parameters in the control unit, the electric hoist is controlled to drive the lifting frame to move upward so that the guide column is inserted into the socket of the bracket. The electric hoist continues to drive the lifting frame to move upward. The lifting frame drives the furnace body on the cooling tower station to move upward together through the cooperation between the guide column and the socket;

[0016] S3: The control unit controls the movable base to drive the furnace body to move along the track. When the position sensor senses that the movable base has moved to the position corresponding to the first or second position, the movable base stops moving, and the furnace body faces the first or second position.

[0017] S4: The control unit controls the electric hoist to drive the lifting frame to move downward, and the furnace body is gradually placed firmly on the first or second position;

[0018] S5: The control unit continues to control the electric hoist to drive the lifting frame to move downward, so that the guide column gradually disengages from the socket of the bracket until the position sensor 2 senses that the lifting frame stops moving when it drops to the bottom. At this time, the lifting frame has completely disengaged from the bracket, completing the displacement of the furnace body.

[0019] The beneficial effects of the present invention are:

[0020] The present invention drives the furnace body to move horizontally and up and down through a horizontal guide rail assembly, a movable base and a vertical lifting assembly, thereby ensuring the smooth operation of the furnace body and improving the safety of operation. The moving distance of the furnace body can be accurately controlled by a control unit. At the same time, multiple position sensors are used to interlock the up and down lifting and horizontal reciprocating movements of the lifting frame. The present shifting mechanism and method only require the staff to operate the control unit at the main console to achieve rapid and smooth shifting of the furnace body, with high work efficiency and small footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a side view of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the furnace bracket of the present invention;

[0024] Figure 4 A schematic diagram of a track of the present invention;

[0025] Figure 5 A top view of the track of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the mobile base of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the vertical groove rail frame of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the lifting frame of the present invention;

[0029] Fig. 9 It is a side view of the lifting frame of the present invention;

[0030] Fig.10 Schematic diagram of the display interface of the control unit of the present invention.

[0031] In the figure, 1-furnace body station, 2-track, 3-movable base, 31-horizontal frame, 32-roller group 1, 33-drive motor, 34-drive gear, 4-rack, 5-vertical groove rail frame, 51-C-shaped groove guide rail, 52-crossbeam, 53-rectangular steel, 6-lifting frame, 61-square steel, 62-side column, 63-roller group 2, 64-support, 65-guide column, 66-lifting frame, 7-bracket, 71-jack, 8-control unit, 81-proximity sensing block 1, 82-position sensor 1, 83-proximity sensing block 2, 84-position sensor 2, 85-photoelectric switch, 9-electric hoist. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] Embodiment 1:

[0034] Please see attached Figure 1-3 As shown, a precise displacement mechanism of a large-tonnage thermal coating device comprises a horizontal guide rail assembly arranged at one side of a furnace body station 1 and a vertical lifting assembly slidably connected to the horizontal guide rail assembly, wherein the horizontal guide rail assembly comprises a track 2 arranged along the length direction of the furnace body station 1 and a movable base 3 moving along the track 2, wherein the movable base 3 comprises a horizontal frame 31, a roller group 32 arranged on both sides of the horizontal frame 31, and a driving mechanism for driving the roller group 32 to move along the track 2, wherein the horizontal frame 31 is a workpiece that carries the horizontal movement of the vertical lifting assembly and is welded from a plurality of rectangular steels. The load-bearing capacity of the base and the torque borne in a high position shall be considered during the design, and the strength calculation of the corresponding components shall be performed, and the safety factor shall be not less than 4.0, as shown in the attached figure. Figure 6 As shown;

[0035] The vertical lifting assembly is fixed above the horizontal frame 31, so that the vertical lifting assembly moves horizontally along the track 2 together with the mobile base 3. The vertical lifting assembly includes a vertical groove rail frame 5 and a lifting frame 6. An electric hoist 9 is provided at the top of the vertical groove rail frame 5. The electric hoist 9 is connected to the lifting frame 6. The lifting frame 6 is pulled up and down along the vertical groove rail frame 5 by the electric hoist 9. A bracket 7 is fixed on the furnace body. The bracket 7 is provided with a plurality of sockets 71. The lifting frame 6 is provided with a guide column 65 that cooperates with the socket 71. The electric hoist 9 pulls the lifting frame 6 to move so that the guide column 65 is inserted into the socket 71, thereby driving the furnace body to move up and down along the vertical groove rail frame 5.

[0036] Please see attached Figure 4 As shown, the track 2 is composed of two grooved guide rails and fixed to the ground by chemical anchors, so that it has sufficient tension to withstand the tipping moment generated by the weight of the furnace body on the vertical grooved rail frame 5. At the same time, the horizontal state of the track 2 can be adjusted by chemical anchors to ensure the flatness of the guide rails and make the entire mechanism run smoothly.

[0037] Please see attached Figure 6 As shown, a rack 4 is provided on the inner surface of one of the grooved guide rails, and the driving mechanism includes a driving motor 33 arranged on the horizontal frame 31 and a driving gear 34 meshing with the rack 4. The output end of the driving motor 33 passes through the side of the horizontal frame 31 and is connected to the driving gear 34. The driving motor 33 is a servo motor with an adjustable running speed. The roller group 32 is respectively placed in the grooved guide rails on both sides. The output end of the driving motor 33 is also provided with a reduction gear box, and the horizontal movement speed can be adjusted by adjusting the parameters by the control unit. The driving motor 33 drives the driving gear 34 to rotate and move along the rack 4, thereby driving the roller group 32 to move along the grooved guide rail. The bottom of the vertical lifting assembly is fixedly connected to the four corners of the horizontal frame 31.

[0038] Please see attached Figure 7 As shown, the vertical groove rail frame 5 includes two C-shaped groove guide rails 51 and a crossbeam 52 connected to the top of the two C-shaped groove guide rails 51. The C-shaped groove guide rails 51 on both sides are connected by the upper crossbeam 52 to form a gantry-type whole. The bottom ends of the two C-shaped groove guide rails 51 are vertically welded to the horizontal frame 31. The electric hoist 9 is fixed on the crossbeam 52 to assume the vertical movement and lifting function of the furnace body. A plurality of rectangular steels 53 are welded to the back of the C-shaped groove guide rail 51 to strengthen the C-shaped groove guide rail 51 and increase the rigidity of the guide rail. In order to increase the bearing capacity of the vertical groove rail frame 5, counterweights can also be placed on the plurality of rectangular steels.

[0039] Please see attached Figure 8As shown, the lifting frame 6 is formed by connecting three horizontally arranged square steels 61 and two side columns 62. The outer side of the side column 62 is provided with a second roller group 63. The second roller group 63 is placed in the C-shaped groove guide rail 51 and moves along the C-shaped groove guide rail 51 to ensure the smooth operation of the furnace body during the lifting and falling process; at the same time, the overturning moment generated by the gravity of the furnace body is evenly transmitted to the C-shaped groove guide rail 51 through the multiple groups of roller groups 63 on the vertical lifting frame 6. The C-shaped groove guide rail 51 must have sufficient strength and rigidity. Strength calculation must be performed during design, and the safety factor must be not less than 4.0;

[0040] Among them, at least two square steels 61 are fixed with supports 64, and at least three supports 64 are provided. The guide posts 65 are fixed to the square steels 61 through the supports 64. In order to ensure that the furnace body does not shake during movement and cause the internal liquid to spill out, at least two brackets 7 are also fixed to the furnace body, and at least three jacks 71 are provided on each bracket 7. The upper and lower brackets 7 are used to distribute the balanced force so that the brackets 7 can move smoothly. Preferably, in order to make the two brackets 7 correspond to the two groups of guide posts 65 one by one, when the lifting frame 6 is located at the bottom end of the vertical groove rail frame 5, the two square steels 61 provided with guide posts 65 are arranged at intervals with the two brackets 7. When lifting, the upper group of guide posts 65 corresponds to the bracket 7 above the furnace body, and the lower group of guide posts 65 corresponds to the bracket 7 below the furnace body.

[0041] Please see attached Fig. 9 As shown, a lifting frame 66 for being hooked and connected to the electric hoist 9 is also fixed on one of the square steels 61 .

[0042] Please see attached Figure 5 , 8 As shown in Figure 10, the precise shifting mechanism also includes a control unit 8, which includes a control circuit, a proximity sensing block 81 and a position sensor 82. The proximity sensing block 81 is fixed on the upper surface of the rack 4 at a position corresponding to the furnace body station 1. The position sensor 82 is fixed on the movable base 3 and moves with the movable base 3 to sense its position. When the operator sets the furnace body to be moved to position No. 1, the movable base 3 drives the lifting frame 6 and the furnace body to move together through the driving motor 33. When the position sensor 82 senses the proximity sensing block 81 at position No. 1, the movable base 3 drives the furnace body to stop automatically. The driving motor 33, the proximity sensing block 81 and the position sensor 82 are all electrically connected to the control circuit.

[0043] Please see attached Figure 2 , 8As shown, the control unit 8 also includes a proximity sensing block 83, a deceleration sensing block (not shown in the accompanying drawings), a position sensor 84 and a photoelectric switch 85. The proximity sensing block 83 is fixed at the top and bottom ends of the side of the C-shaped groove guide rail 51. The deceleration sensing block is arranged at a certain position away from the proximity sensing block 83 and fixed on the side of the C-shaped groove guide rail 51. The position sensor 84 is fixed under the lifting frame 6. The position sensor 84 is used to sense whether there is a furnace body on the workstation facing the lifting frame 6 to execute the lifting command, and at the same time control the lifting frame 6 to freely switch between high speed and low speed when the rising and falling speeds, and automatically stop when the furnace body reaches the highest position and the lowest position; the photoelectric switch 85 is fixed on the top surface of the lifting frame 6, and is used to judge whether the positions of the guide column 65 and the socket 71 are aligned, whether the guide column 65 is separated from or inserted into the furnace body, and other information, so as to feedback the control power supply to perform corresponding actions, and the proximity sensing block 83, the position sensor 84, the photoelectric switch 85 and the electric hoist 9 are all electrically connected to the control circuit.

[0044] Embodiment 2:

[0045] A method for accurately shifting a large-tonnage thermal coating device comprises the following steps:

[0046] S1: The thermal coating device is arranged horizontally with two furnaces and four stations. The four stations are cooling tower station, heating furnace station, No. 1 station and No. 2 station from left to right. The two furnaces are cooling tower and heating furnace respectively. The cooling tower station is regarded as the origin coordinate position. In the initial position, the vertical lifting assembly is located at the leftmost end of the horizontal guide rail assembly, and the guide column 65 on the square steel 61 is located directly below the socket 71 on the bracket 7 of the cooling tower; wherein, the vertical lifting assembly is located at both ends of the horizontal guide rail assembly with mechanical limit blocks (not shown in the drawings) to improve the safety of displacement;

[0047] S2: By inputting the movement parameters into the control unit 8, as shown in the attached Fig.10 As shown, there is a "parameter setting" button on the display interface of the control unit 8, through which the operator sets the parameters of each station relative to the origin position, and sets the position where the cooling tower and the heating furnace need to move. If the furnace body needs to be moved to the first or second position, the control circuit controls the electric hoist 9 to drive the lifting frame 6 to move upward. The electric hoist 9 is a variable frequency electric hoist. When the position sensor 84 senses the deceleration sensing block, the electric hoist 9 automatically slows down the rising speed of the lifting frame 6, so that the guide column 65 is gradually inserted into the jack 71 of the bracket 7 to prevent the furnace body from rising and falling too fast and inertially impacting the furnace body or the vertical groove rail frame. The variable frequency electric hoist can stop the lifting frame from moving to the limit position, and the lifting and lowering speeds are variable frequency adjustable;

[0048] At this time, the photoelectric switch 85 is used to determine whether the positions of the guide column 65 and the socket 71 are aligned and whether the guide column 65 has been fully inserted into the socket 71. If it has been fully inserted into the socket 71, the electric hoist 9 continues to drive the lifting frame 6 to move upward, and the lifting frame 6 drives the furnace body on the cooling tower station to move upward together through the cooperation between the guide column 65 and the socket 71;

[0049] When the position sensor 84 senses the deceleration sensing block and the proximity sensing block 83 on the side of the C-shaped groove guide rail 51, it gradually decelerates until the lifting frame 6 has risen to the top and stops moving upward;

[0050] S3: The control unit 8 controls the movable base 3 to drive the furnace body to move horizontally along the track 2. When the position sensor 82 senses that the movable base 3 has moved to the position corresponding to the first position or the second position, the movement stops, and the furnace body faces the first position or the second position.

[0051] S4: Then, the control unit 8 controls the electric hoist 9 to drive the lifting frame 6 to move downward. When the position sensor 84 senses that it is almost at the bottom, the descending speed of the lifting frame 6 is slowed down, and the furnace body is gradually placed on the first or second position;

[0052] S5: After the furnace body is placed firmly in position 1 or 2, the control unit 8 continues to control the electric hoist 9 to drive the lifting frame 6 to move downward, so that the guide column 65 gradually disengages from the socket 71 of the bracket 7, until the position sensor 2 84 senses that the lifting frame 6 stops moving when it drops to the bottom. At this time, the photoelectric switch 85 is used to determine whether the guide column 65 has completely disengaged from the socket 71. If it has been completely disengaged, at this time, the lifting frame 6 has completely disengaged from the bracket 7, and a command can be issued to move the mobile base 3 horizontally along the track 2 to complete the displacement of the furnace body.

[0053] Similarly, when the cooling tower is completed heat treatment at position one or position two, it is necessary to put the cooling tower back from position one or position two to the cooling tower work station, and the operating process principle is the same as above.

[0054] This method can accurately control the moving distance of the furnace body. At the same time, multiple position sensors are used to interlock the lifting frame 6 in the up and down lifting and horizontal reciprocating movements, thereby ensuring the smooth operation of the furnace body and improving the safety of operation. The operator only needs to input instructions and parameters on the display interface of the control unit 8 to achieve rapid and smooth displacement of the furnace body, thereby reducing manpower and improving work efficiency.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0056] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A precise displacement mechanism for a large-tonnage thermal coating device, characterized in that: The invention comprises a horizontal guide rail assembly arranged on one side of a furnace body station (1) and a vertical lifting assembly slidably connected to the horizontal guide rail assembly, wherein the horizontal guide rail assembly comprises a track (2) arranged along the length direction of the furnace body station (1) and a movable base (3) moving along the track (2), wherein the movable base (3) comprises a horizontal frame (31), a roller group (32) arranged on both sides of the horizontal frame (31), and a driving mechanism driving the roller group (32) to move along the track (2), and the vertical lifting assembly is fixed above the horizontal frame (31). The vertical lifting assembly comprises a vertical groove rail frame (5) and a lifting frame (6). An electric hoist (9) is provided at the top of the vertical groove rail frame (5). The electric hoist (9) is connected to the lifting frame (6). A bracket (7) is fixed on the furnace body. The bracket (7) is provided with a plurality of sockets (71). The lifting frame (6) is provided with a guide column (65) matched with the sockets (71). The electric hoist (9) pulls the lifting frame (6) to move so that the guide column (65) is inserted into the socket (71), thereby driving the furnace body to move up and down along the vertical groove rail frame (5).

2. According to claim 1, a precise displacement mechanism for a large-tonnage thermal coating device is characterized in that: The track (2) consists of two grooved guide rails and is fixed on the ground by chemical anchor bolts.

3. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 2 is characterized in that: A rack (4) is provided on the inner surface of one of the grooved guide rails, the driving mechanism comprises a driving motor (33) arranged on the horizontal frame (31) and a driving gear (34) meshing with the rack (4), the output end of the driving motor (33) passes through the side of the horizontal frame (31) and is connected to the driving gear (34), the roller group (32) is respectively placed in the grooved guide rails on both sides, and the bottom of the vertical lifting assembly is fixedly connected to the four corners of the horizontal frame (31).

4. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 3 is characterized in that: The vertical groove rail frame (5) comprises two C-shaped groove rails (51) and a crossbeam (52) connected to the tops of the two C-shaped groove rails (51), the bottom ends of the two C-shaped groove rails (51) are vertically welded to the horizontal frame (31), the electric hoist (9) is fixed on the crossbeam (52), and a plurality of rectangular steels (53) are welded to the back of the C-shaped groove rails (51).

5. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 4 is characterized in that: The lifting frame (6) is formed by connecting three horizontally arranged square steels (61) and two side columns (62). A second roller group (63) is provided on the outer side of the side column (62). The second roller group (63) is placed in the C-shaped groove guide rail (51) and moves along the C-shaped groove guide rail (51). At least two square steels (61) are fixed with supports (64). The guide column (65) is fixed on the square steel (61) through the support (64). At least two brackets (7) are also fixed on the furnace body. When the lifting frame (6) is located at the bottom end of the vertical groove rail frame (5), the two square steels (61) provided with the guide column (65) are arranged at intervals with the two brackets (7).

6. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 5 is characterized in that: A lifting frame (66) for being hooked and connected to the electric hoist (9) is also fixed on one of the square steels (61).

7. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 7 is characterized in that: The precise shifting mechanism further comprises a control unit (8), the control unit (8) comprising a control circuit, a proximity sensing block (81) and a position sensor (82), the proximity sensing block (81) being fixed on a position on the upper surface of the rack (4) corresponding to a furnace body station (1), the position sensor (82) being fixed on the movable base (3) and moving with the movable base (3) to sense its position, and the drive motor (33), the proximity sensing block (81) and the position sensor (82) are all electrically connected to the control circuit.

8. The precise displacement mechanism of a large-tonnage thermal coating device according to claim 7 is characterized in that: The control unit (8) further comprises a proximity sensing block (83), a deceleration sensing block, a position sensor (84) and a photoelectric switch (85); the proximity sensing block (83) is fixed to the top and bottom ends of the side of the C-shaped groove guide rail (51); the deceleration sensing block is arranged at a certain position from the proximity sensing block (83) and fixed to the side of the C-shaped groove guide rail (51); the position sensor (84) is fixed below the lifting frame (6); the photoelectric switch (85) is fixed to the top surface of the lifting frame (6); and the proximity sensing block (83), the position sensor (84), the photoelectric switch (85) and the electric hoist (9) are all electrically connected to the control circuit.

9. A method for precise displacement of a large-tonnage thermal coating device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The thermal coating device is arranged horizontally with two furnaces and four stations. The four stations are respectively a cooling tower station, a heating furnace station, a No. 1 station, and a No. 2 station from left to right. The cooling tower station is regarded as the origin coordinate position. In the initial position, the vertical lifting assembly is located at the leftmost end of the horizontal guide rail assembly, and the guide column (65) on the square steel (61) is located directly below the socket (71) on the support plate; S2: By inputting movement parameters into the control unit (8), the electric hoist (9) is controlled to drive the lifting frame (6) to move upward so that the guide column (65) is inserted into the socket (71) of the bracket (7), and the electric hoist (9) continues to drive the lifting frame (6) to move upward. The lifting frame (6) drives the furnace body on the cooling tower station to move upward together through the cooperation between the guide column (65) and the socket (71); S3: The control unit (8) controls the movable base (3) to drive the furnace body to move along the track (2), and when the position sensor (82) senses that the movable base (3) has moved to the position corresponding to the first position or the second position, the movable base (3) stops moving, and the furnace body faces the first position or the second position; S4: The control unit (8) controls the electric hoist (9) to drive the lifting frame (6) to move downward, and the furnace body is gradually placed firmly on the first or second position; S5: The control unit (8) continues to control the electric hoist (9) to drive the lifting frame (6) to move downward, so that the guide column (65) gradually disengages from the socket (71) of the bracket (7), until the position sensor 2 (84) senses that the lifting frame (6) stops moving when it has descended to the bottom. At this time, the lifting frame (6) has completely disengaged from the bracket (7), completing the displacement of the furnace body.

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