Jacking, rotating and positioning mechanism for engine tray

Abstract

An engine tray jacking, rotating and positioning mechanism comprises a floating base plate, a gear disc, a lifting mechanism, a guiding mechanism and a supporting mechanism, the guiding mechanism comprises an outer guiding column and an inner guiding column, the inner guiding column is rotatably connected to the inner side of the outer guiding column in a sleeved mode, and the upper side of the outer guiding column is fixedly connected with the lower side of the floating base plate; the top end of the inner guide column penetrates through the floating base plate and is fixedly connected with the center of the gear disc, a plurality of tray positioning pins are fixedly arranged on the upper side of the gear disc, the lower end of the lifting mechanism is connected with the supporting mechanism, the upper end of the lifting mechanism is connected with the floating base plate, and the floating base plate is provided with a gear disc driving mechanism. According to the engine tray reversing device, the engine tray which is conveyed can be accurately positioned through the tray positioning pins arranged on the gear disc, the gear disc driving mechanism and the lifting mechanism are used for accurately rotating and lifting the gear disc by a specified angle and height, reversing of the engine tray is completed, and efficiency, stability and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to engine manufacturing production line equipment, specifically an engine tray lifting and rotating positioning mechanism. Background Technology

[0002] During the assembly line transport process, engines need to be placed on engine trays for transfer. When transferring between different conveyor lines, the direction needs to be changed, and the accuracy of lifting, rotating, and positioning of the engine trays must be ensured during these changes. In existing technology, the rotation of engine trays on the assembly line is done manually, which is inefficient, unstable, and unreliable, and cannot meet daily production needs. Summary of the Invention

[0003] The purpose of this utility model is to provide an engine pallet lifting, rotating and positioning mechanism, which aims to solve the technical problems of low efficiency, instability and low reliability of engine pallet lifting, rotating and positioning in the prior art.

[0004] This utility model discloses an engine pallet lifting and rotating positioning mechanism, comprising a floating base plate, a gear disk, a lifting mechanism, a guiding mechanism, and a supporting mechanism. The guiding mechanism includes an outer guide post and an inner guide post. The inner guide post is rotatably sleeved on the inner side of the outer guide post. The upper side of the outer guide post is fixedly connected to the lower side of the floating base plate. The top end of the inner guide post passes through the floating base plate and is fixedly connected to the center of the gear disk. A plurality of pallet positioning pins are fixedly provided on the upper side of the gear disk. The lower end of the lifting mechanism is connected to the supporting mechanism, and the upper end of the lifting mechanism is connected to the floating base plate. The floating base plate is provided with a gear disk driving mechanism.

[0005] Furthermore, the lifting mechanism includes two lifting cylinders, the lower end of which is fixedly connected to the support mechanism, and the piston rod of which is connected to the floating base plate through a lifting floating joint.

[0006] Furthermore, the gear drive mechanism includes a servo motor and a reducer. The reducer is fixed on the lower side of the floating base plate. The input end of the reducer is connected to the servo motor, and the output end of the reducer passes through the floating base plate and is connected to a pinion. The pinion meshes with the gear disk.

[0007] Furthermore, the reducer is a right-angle helical planetary reducer; a protective cover is installed above the floating base plate, and the protective cover covers the pinion.

[0008] Furthermore, the outer guide post has a through hole in the middle, and stepped holes are respectively provided at both ends of the through hole. Each stepped hole is provided with an angular contact bearing and a thrust bearing from the inside to the outside. The two ends of the inner guide post are sleeved on the inner side of the two angular contact bearings. A first collar is provided on the upper side of the circumferential surface of the inner guide post, and a first washer is provided on the lower side of the first collar. The lower side of the first washer abuts against the upper side of the thrust bearing in the stepped hole at the upper end of the outer guide post. A round nut is installed below the inner guide post, and a second washer is provided above the round nut. The upper side of the second washer abuts against the lower side of the thrust bearing in the stepped hole at the lower end of the outer guide post.

[0009] Furthermore, the support mechanism includes a base plate, a base is installed on the top of the base plate, the lifting mechanism is fixedly connected to the base, a crossbeam is provided below the base plate, a support pad is provided below the crossbeam, and a foot support and a fixed bracket are provided below the support pad.

[0010] Furthermore, an upper stop disc and a lower stop disc are fixedly arranged sequentially from top to bottom in the middle of the base. The outer guide post is sleeved inside the upper and lower stop discs. A second collar is provided on the outer side of the upper end of the outer guide post, which is located on the upper side of the upper stop disc. A stop ring is provided at the lower end of the outer guide post, and a stop washer is provided on the upper side of the stop ring. The stop washer is located on the lower side of the lower stop disc. A fourth proximity switch is fixedly arranged on one side of the upper stop disc, and the fourth proximity switch is aligned with the lower side of the floating base plate. A limit post is fixedly arranged above the upper stop disc, and a buffer block is fixedly arranged above the limit post.

[0011] Furthermore, a stop groove is provided on the outer side of the outer guide post, and a lower locking mechanism is provided on one side of the support mechanism. The lower locking mechanism includes a sleeve, a positioning guide block, a transverse cylinder, a positioning floating joint, and an oil-free bushing. The sleeve is fixedly connected to the support mechanism, the oil-free bushing is installed inside the sleeve, the positioning guide block is installed inside the oil-free bushing, the transverse cylinder is transversely installed on one side of the sleeve, one end of the positioning guide block is connected to the piston rod of the transverse cylinder through the positioning floating joint, and the other end of the positioning guide block can be inserted into the stop groove. A second proximity switch is fixedly provided on one side of the support mechanism, and the second proximity switch is aligned with the side of the gear disk.

[0012] Furthermore, the gear disk is provided with multiple positioning holes, and the lower side of any pallet positioning pin is connected to the positioning hole. The lower side of the floating base plate is provided with an upper locking mechanism, which includes a vertical cylinder, a cylinder pad, and a locking pin. The cylinder pad is installed on the lower side of the floating base plate, and the vertical cylinder is vertically installed on the lower side of the cylinder pad. The piston rod of the vertical cylinder is connected to the locking pin, and the locking pin can pass through the cylinder pad and the floating base plate and be inserted into the positioning hole of the gear disk. A third proximity switch is fixedly provided on one side of the floating base plate, and the third proximity switch is aligned with the positioning hole.

[0013] Furthermore, at least one upward-facing first proximity switch is fixedly disposed on the side of the floating substrate.

[0014] Compared with existing technologies, the advantages of this invention are positive and significant. This invention, through the pallet positioning pins on the gear disc, can accurately position the engine pallet brought by the conveyor. The gear disc drive mechanism and lifting mechanism accurately rotate and raise the gear disc to a specified angle and height, completing the reversal of the engine pallet and improving efficiency, stability, and reliability. Attached Figure Description

[0015] Figure 1 This is the front view of this utility model.

[0016] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0017] Figure 3 This is a schematic diagram of the lifting mechanism of this utility model.

[0018] Figure 4 This is a three-dimensional schematic diagram of the gear disk drive mechanism of this utility model.

[0019] Figure 5 This is a front view of the gear drive mechanism of this utility model.

[0020] Figure 6 This is a lower schematic diagram of the guide mechanism of this utility model.

[0021] Figure 7 This is a cross-sectional view of the guide mechanism of this utility model.

[0022] Figure 8 This is a schematic diagram of the support mechanism of this utility model.

[0023] Figure 9 This is a front view of the locking mechanism of this utility model.

[0024] Figure 10 This is a partial sectional view of the locking mechanism of this utility model.

[0025] Markings in the diagram: 1. Floating base plate; 2. Gear disk; 201. Positioning hole; 3. Pallet positioning pin; 4. Engine pallet; 5. Lifting mechanism; 501. Lifting cylinder; 502. Lifting floating joint; 6. Gear disk drive mechanism; 601. Servo motor; 602. Reducer; 603. Pinion; 604. Protective cover; 7. Guide mechanism; 701. Outer guide post; 702. Thrust bearing; 703. Angular contact bearing; 704. Locking washer; 705. Locking ring; 706. Round nut; 707. Inner guide post; 708. First washer; 709. Locking groove; 710. Second washer; 711. First collar; 712. Second collar; 8. Support Support mechanism; 801, foot support; 802, support pad; 803, fixed bracket; 804, base plate; 805, crossbeam; 806, base; 807, lower stop disc; 808, upper stop disc; 809, limit post; 810, buffer block; 9, lower locking mechanism; 901, sleeve; 902, positioning guide block; 903, horizontal cylinder; 904, positioning floating joint; 905, oil-free bushing; 10, upper locking mechanism; 1001, vertical cylinder; 1002, cylinder pad; 1003, locking pin; 1101, first proximity switch; 1102, second proximity switch; 1103, third proximity switch; 1104, fourth proximity switch. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention.

[0027] like Figures 1-2 As shown, the engine tray lifting and rotating positioning mechanism of this utility model includes a floating base plate 1, a gear disk 2, a lifting mechanism 5, a guiding mechanism 7, and a supporting mechanism 8. Figure 6 As shown, the guiding mechanism 7 includes an outer guide post 701 and an inner guide post 707. The inner guide post 707 is rotatably sleeved on the inner side of the outer guide post 701. The upper side of the outer guide post 701 is fixedly connected to the lower side of the floating base plate 1. The top end of the inner guide post 707 passes through the floating base plate 1 and is fixedly connected to the center of the gear disk 2. A plurality of tray positioning pins 3 are fixedly provided on the upper side of the gear disk 2. The lower end of the lifting mechanism 5 is connected to the support mechanism 8, and the upper end of the lifting mechanism 5 is connected to the floating base plate 1. The floating base plate 1 is provided with a gear disk drive mechanism 6.

[0028] Specifically, the pallet positioning pin 3 is used to position the engine pallet 4. Then, the floating base plate 1 is lifted by the lifting mechanism 5. After being lifted into position, the gear disk drive mechanism 6 drives the gear disk 2 to rotate by a specified angle, thereby lifting the engine pallet 4 to a specified height and rotating it by a specified angle, thus completing the reversal of the engine pallet 4. The inner guide post 707, as the rotation center, is sleeved on the inner side of the outer guide post 701 to improve the stability of the gear disk 2 during rotation.

[0029] At least one upward-facing first proximity switch 1101 is fixedly disposed on the side of the floating base plate 1. The first proximity switch 1101 can detect whether the engine tray 4 is in position. Preferably, a detection block can be disposed on the lower side of the engine tray 4, and two first proximity switches 1101 can be disposed on the side of the floating base plate 1 to detect whether the engine tray 4 is in position at the beginning and end of the rotation.

[0030] like Figure 3 As shown, the lifting mechanism 5 includes two lifting cylinders 501. The lower end of any one of the lifting cylinders 501 is fixedly connected to the support mechanism 8, and the piston rod of any one of the lifting cylinders 501 is connected to the floating base plate 1 through the lifting floating joint 502.

[0031] Specifically, setting two lifting cylinders 501 can improve the load-bearing capacity during lifting. The two lifting cylinders 501 can be symmetrically arranged on both sides below the floating base plate 1. The floating joint 502 can flexibly connect the floating base plate 1 and the lifting cylinders 501 to prevent jamming during lifting.

[0032] like Figures 4-5 As shown, the gear drive mechanism 6 includes a servo motor 601 and a reducer 602. The reducer 602 is fixed to the lower side of the floating base plate 1. The input end of the reducer 602 is connected to the servo motor 601, and the output end of the reducer 602 passes through the floating base plate 1 and connects to a pinion 603. The pinion 603 meshes with the gear disk 2. The reducer 602 is a right-angle helical planetary reducer. A protective cover 604 is installed above the floating base plate 1, covering the pinion 603.

[0033] Specifically, a servo motor 601 and a reducer 602 drive a pinion 603, which in turn drives the gear disk 2, thus improving the rotational accuracy of the gear disk 2. Using a right-angle helical planetary reducer allows for a change in the mounting angle of the servo motor 601, enabling it to be mounted horizontally and saving space. A protective cover 604 protects the pinion 603 and the meshing portion between it and the gear disk 2.

[0034] like Figures 6-7As shown, the outer guide post 701 has a through hole in the middle, and stepped holes are provided at both ends of the through hole. An angular contact bearing 703 and a thrust bearing 702 are arranged sequentially from the inside to the outside in any of the stepped holes. The two ends of the inner guide post 707 are sleeved on the inner side of the two angular contact bearings 703. A first collar 711 is provided on the upper side of the circumferential surface of the inner guide post 707. A first washer 708 is provided on the lower side of the first collar 711. The lower side of the first washer 708 abuts against the upper side of the thrust bearing 702 in the stepped hole at the upper end of the outer guide post 701. A round nut 706 is installed below the inner guide post 707. A second washer 710 is provided above the round nut 706. The upper side of the second washer 710 abuts against the lower side of the thrust bearing 702 in the stepped hole at the lower end of the outer guide post 701.

[0035] Specifically, the two ends of the inner guide post 707 are sleeved in the angular contact bearing 703, which can improve the rotational stability of the inner guide post 707. The first collar 711 is supported on the thrust bearing 702 by the first washer 708, so that the inner guide post 707 is axially positioned. The thrust bearing 702 ensures the axial stability of the inner guide post 707 when rotating. The round nut 706 can prevent the angular contact bearing 703, the thrust bearing 702 and the second washer 710 in the lower stepped hole from falling off.

[0036] like Figure 8 As shown, the support mechanism 8 includes a base plate 804, a base 806 is installed on the top of the base plate 804, the lifting mechanism 5 is fixedly connected to the base 806, a crossbeam 805 is provided on the lower side of the base plate 804, a support pad 802 is provided on the lower side of the crossbeam 805, and a foot support 801 and a fixed bracket 803 are provided on the lower side of the support pad 802.

[0037] Specifically, the two sides of the base 806 can be designed in a Z-shape to facilitate the installation of the lifting mechanism 5 on the Z-shaped structure of the base 806. The foot support 801 is connected to the crossbeam 805 through the support pad 802. The support pad 802 is used to support the entire mechanism. The fixed bracket 803 can be L-shaped to facilitate the installation of the mechanism of this utility model on the assembly line.

[0038] An upper stop disc 808 and a lower stop disc 807 are fixedly arranged sequentially from top to bottom in the middle of the base 806. The outer guide post 701 is sleeved inside the upper stop disc 808 and the lower stop disc 807. A second shaft ring 712 is provided on the outer side of the upper end of the outer guide post 701. The second shaft ring 712 is located above the upper stop disc 808. A stop ring 705 is provided at the lower end of the outer guide post 701. A stop washer 704 is provided on the upper side of the stop ring 705. The stop washer 704 is located below the lower stop disc 807. A fourth proximity switch 1104 is fixedly arranged on one side of the upper stop disc 808. The fourth proximity switch 1104 is aligned with the lower side of the floating base plate 1. A limit post 809 is fixedly arranged on the upper side of the upper stop disc 808. A buffer block 810 is fixedly arranged at the upper end of the limit post 809.

[0039] Specifically, the upper stop disc 808 and the lower stop disc 807 are used to limit the up-and-down movement of the guide mechanism 7. The upper stop disc 808 limits the downward movement of the outer guide post against the second collar 712, and the lower stop disc 807 limits the upward movement of the stop ring 705. The fourth proximity switch 1104 is used to detect the height of the floating substrate 1, and the signal of the fourth proximity switch 1104 is triggered after the floating substrate 1 rises. The limiting post 809 and the buffer block 810 are used to limit and buffer the floating substrate 1 when it descends.

[0040] like Figure 9 As shown, a stop groove 709 is provided on the outer side of the outer guide post 701, and a lower locking mechanism 9 is provided on one side of the support mechanism 8. The lower locking mechanism 9 includes a sleeve 901, a positioning guide block 902, a horizontal cylinder 903, a positioning floating joint 904, and an oil-free bushing 905. The sleeve 901 is fixedly connected to the support mechanism 8, the oil-free bushing 905 is installed inside the sleeve 901, the positioning guide block 902 is installed inside the oil-free bushing 905, the horizontal cylinder 903 is horizontally installed on one side of the sleeve 901, one end of the positioning guide block 902 is connected to the piston rod of the horizontal cylinder 903 through the positioning floating joint 904, and the other end of the positioning guide block 902 can be inserted into the stop groove 709. Figure 1 , Figure 3 As shown, a second proximity switch 1102 is fixedly installed on one side of the horizontal cylinder 903 via a connector, and the second proximity switch 1102 is aligned with the side of the gear disk 2.

[0041] Specifically, when the floating base plate 2 is raised or lowered, the upper side of the outer guide post 701 of the guide mechanism 7 is connected to the lower side of the floating base plate 2 and rises or falls together with the floating base plate 2. The lower locking mechanism 9 is used to lock the outer guide post 701 after it is raised. The sleeve 901 can be fixedly connected to the base 806 in the support mechanism 8. The oil-free bushing 905 plays a positioning and guiding role for the guide block 902. The horizontal cylinder 903 pushes the guide block 902 into the stop groove 709 of the outer guide post 701 through the positioning floating joint 904, so that the height can be accurately positioned. The second proximity switch 1102 is set on the side of the gear disk 2 when the floating base plate 2 is in the lowering position, and can trigger a signal after it rises.

[0042] like Figure 10 As shown, the gear disk 2 is provided with multiple positioning holes 201, and the lower end of any pallet positioning pin 3 is connected to the positioning hole 201. The lower side of the floating base plate 1 is provided with an upper locking mechanism 10. The upper locking mechanism 10 includes a vertical cylinder 1001, a cylinder pad 1002, and a locking pin 1003. The cylinder pad 1002 is installed on the lower side of the floating base plate 1, and the vertical cylinder 1001 is vertically installed on the lower side of the cylinder pad 1002. The piston rod of the vertical cylinder 1001 is connected to the locking pin 1003. The locking pin 1003 can pass through the cylinder pad 1002 and the floating base plate 1 and be inserted into one of the positioning holes 201 of the gear disk 2. A third proximity switch 1103 is fixedly provided on one side of the floating base plate 1. The third proximity switch 1103 is aligned with another positioning hole 201.

[0043] Specifically, the upper locking mechanism 9 is located at one of the positioning holes 201 when the gear disk 2 rotates to its final position. This mechanism is used to lock the angle of the gear disk 2 after it has rotated to its final position. After the gear disk 3 has rotated to its final position, the vertical cylinder 1001 drives the locking pin 1003 to extend into the positioning hole 201. The third proximity switch 1103 is aligned with the other positioning hole 201 when the gear disk 2 has rotated to its final position, and sends a signal when the gear disk 2 has rotated to its final position.

[0044] In use, the engine tray 4 is transported from the previous station to above the gear disk 2 and positioned by the tray positioning pin 3. After the first proximity switch 1101 detects that the engine tray 4 is in place, the floating base plate 1 is lifted by the lifting mechanism 5. After the second proximity switch 1102 detects that the gear disk 2 has left its original position, and after the fourth proximity switch 1104 detects that the floating base plate 1 has been lifted into place, the horizontal cylinder 903 of the lower locking mechanism 9 drives the positioning guide block 902 to insert into the stop groove 709 to fix the height of the guide mechanism 7. Then, the gear disk drive mechanism 6 drives the gear disk 2 to rotate by a specified angle. After the third proximity switch 1103 detects that the gear disk 2 has rotated into place, the vertical cylinder 1001 of the upper locking mechanism 10 drives the locking pin 1003 to insert into the positioning hole 201 to lock the gear disk 2. Then, the engine tray 4, which has been lifted to the specified height and rotated to the specified angle, can be sent to the next station by the conveying equipment.

[0045] Specifically, the signal terminals of the first proximity switch 1101, the second proximity switch 1102, the third proximity switch 1103, the fourth proximity switch 1104, the control terminal of the servo motor 601, the control terminal of the lifting cylinder 501, the control terminal of the horizontal cylinder 903, and the control terminal of the vertical cylinder 1001 are all connected to a controller via cables. The first proximity switch 1101, the second proximity switch 1102, the third proximity switch 1103, the fourth proximity switch 1104, the servo motor 601, the lifting cylinder 501, the horizontal cylinder 903, the vertical cylinder 1001, the controller, and their connection methods all adopt well-known technical solutions in the prior art, which are understood by those skilled in the art and will not be described in detail here.

Claims

1. An engine pallet lifting and rotating positioning mechanism, characterized in that: The system includes a floating base plate (1), a gear disk (2), a lifting mechanism (5), a guiding mechanism (7), and a supporting mechanism (8). The guiding mechanism (7) includes an outer guide post (701) and an inner guide post (707). The inner guide post (707) is rotatably sleeved on the inner side of the outer guide post (701). The upper side of the outer guide post (701) is fixedly connected to the lower side of the floating base plate (1). The top end of the inner guide post (707) passes through the floating base plate (1) and is fixedly connected to the center of the gear disk (2). A plurality of pallet positioning pins (3) are fixedly provided on the upper side of the gear disk (2). The lower end of the lifting mechanism (5) is connected to the supporting mechanism (8), and the upper end of the lifting mechanism (5) is connected to the floating base plate (1). The floating base plate (1) is provided with a gear disk drive mechanism (6).

2. The engine tray lifting and rotating positioning mechanism as described in claim 1, characterized in that: The lifting mechanism (5) includes two lifting cylinders (501). The lower end of any one of the lifting cylinders (501) is fixedly connected to the support mechanism (8). The piston rod of any one of the lifting cylinders (501) is connected to the floating base plate (1) through the lifting floating joint (502).

3. The engine tray lifting and rotating positioning mechanism as described in claim 1, characterized in that: The gear drive mechanism (6) includes a servo motor (601) and a reducer (602). The reducer (602) is fixed on the lower side of the floating base plate (1). The input end of the reducer (602) is connected to the servo motor (601). The output end of the reducer (602) passes through the floating base plate (1) and is connected to a pinion (603). The pinion (603) meshes with the gear disk (2).

4. The engine tray lifting and rotating positioning mechanism as described in claim 3, characterized in that: The reducer (602) is a right-angle helical planetary reducer; a protective cover (604) is installed above the floating base plate (1), and the protective cover (604) covers the pinion (603).

5. The engine pallet lifting and rotating positioning mechanism as described in claim 1, characterized in that: The outer guide post (701) has a through hole in the middle, and stepped holes are provided at both ends of the through hole. An angular contact bearing (703) and a thrust bearing (702) are sequentially arranged from the inside to the outside in each stepped hole. The two ends of the inner guide post (707) are sleeved on the inner sides of the two angular contact bearings (703). A first collar (711) is provided on the upper side of the circumferential surface of the inner guide post (707), and a second... A washer (708) is provided, the lower side of which abuts against the upper side of the thrust bearing (702) in the stepped hole at the upper end of the outer guide post (701). A round nut (706) is installed below the inner guide post (707). A second washer (710) is provided above the round nut (706). The upper side of the second washer (710) abuts against the lower side of the thrust bearing (702) in the stepped hole at the lower end of the outer guide post (701).

6. The engine pallet lifting and rotating positioning mechanism as described in claim 1, characterized in that: The support mechanism (8) includes a base plate (804), a base (806) is installed on the top of the base plate (804), the lifting mechanism (5) is fixedly connected to the base (806), a crossbeam (805) is provided below the base plate (804), a support pad (802) is provided below the crossbeam (805), and a foot support (801) and a fixed bracket (803) are provided below the support pad (802).

7. The engine pallet lifting and rotating positioning mechanism as described in claim 6, characterized in that: The base (806) has an upper stop disc (808) and a lower stop disc (807) fixedly arranged from top to bottom in the middle. The outer guide post (701) is fitted inside the upper stop disc (808) and the lower stop disc (807). A second collar (712) is provided on the outer side of the upper end of the outer guide post (701), and the second collar (712) is located above the upper stop disc (808). A stop ring (705) is provided at the lower end of the outer guide post (701). A stop washer (704) is provided on the upper side of the upper stop disk (805). The stop washer (704) is located below the lower stop disk (807). A fourth proximity switch (1104) is fixedly provided on one side of the upper stop disk (808). The fourth proximity switch (1104) is aligned with the lower side of the floating base plate (1). A limit post (809) is fixedly provided on the upper side of the upper stop disk (808). A buffer block (810) is fixedly provided at the upper end of the limit post (809).

8. The engine pallet lifting and rotating positioning mechanism as described in claim 1, characterized in that: A stop groove (709) is provided on the outer side of the outer guide post (701), and a lower locking mechanism (9) is provided on one side of the support mechanism (8). The lower locking mechanism (9) includes a sleeve (901), a positioning guide block (902), a horizontal cylinder (903), a positioning floating joint (904), and an oil-free bushing (905). The sleeve (901) is fixedly connected to the support mechanism (8), and the oil-free bushing (905) is installed inside the sleeve (901). The positioning guide block (902) is installed... Inside the oil-free bushing (905), the horizontal cylinder (903) is horizontally mounted on one side of the sleeve (901). One end of the positioning guide block (902) is connected to the piston rod of the horizontal cylinder (903) through the positioning floating joint (904). The other end of the positioning guide block (902) can be inserted into the stop groove (709). A second proximity switch (1102) is fixedly provided on one side of the horizontal cylinder (903). The second proximity switch (1102) is aligned with the side of the gear disk (2).

9. The engine pallet lifting and rotating positioning mechanism as described in claim 1, characterized in that: The gear disk (2) is provided with multiple positioning holes (201), and the lower end of any pallet positioning pin (3) is connected to the positioning hole (201). The floating base plate (1) is provided with an upper locking mechanism (10) on its lower side. The upper locking mechanism (10) includes a vertical cylinder (1001), a cylinder pad (1002), and a locking pin (1003). The cylinder pad (1002) is installed on the lower side of the floating base plate (1). The vertical cylinder (1001) The cylinder (1001) is vertically installed on the lower side of the cylinder block (1002). The piston rod of the vertical cylinder (1001) is connected to the locking pin (1003). The locking pin (1003) can pass through the cylinder block (1002) and the floating base plate (1) and be inserted into a positioning hole (201) of the gear disk (2). A third proximity switch (1103) is fixedly provided on one side of the floating base plate (1). The third proximity switch (1103) is aligned with another positioning hole (201).

10. The engine pallet lifting and rotating positioning mechanism as described in claim 1, characterized in that: At least one upward-facing first proximity switch (1101) is fixedly disposed on the side of the floating substrate (1).

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