An automatic hook-on and hook-off rotary connection device for a mine car

Abstract

The present invention relates to an automatic hook-on and hook-off rotary connection device for mine cars, which includes a U-shaped hook base, a hook and a hook reset device. The automatic hook-on and hook-off rotary connection devices for mine cars are used in pairs. The two paired automatic hook-on and hook-off rotary connection devices for mine cars are respectively assembled at the connection ends of the two mine cars. The automatic hook-on and hook-off rotary connection devices on the two mine cars are centrosymmetric. When the two mine cars approach each other, the abutting surface of one mine car contacts and abuts against the smooth surface of the other mine car, causing the convex parts of the automatic hook-on and hook-off rotary connection devices of the two mine cars to rotate towards the direction close to the central axis of the main shaft. After rotation, the convex parts of the two automatic hook-on and hook-off rotary connection devices for mine cars are hooked to each other. The automatic hook-on and hook-off rotary connection device for mine cars of the present invention enables the mine cars to automatically hook on and hook off during operation without the need for operators to participate in the operation; it is shock-resistant and has a stable overlap; the hook does not become unhooked when the mine car is overturned to unload ore, and the hook can rotate 360° along with the mine car and can automatically position itself after rotation.

Description

Technical Field

[0001] The present invention relates to the field of mining machinery and equipment, and particularly to an automatic hook-on and hook-off rotary connection device for mine cars. Background Art

[0002] The existing connection of mine cars still uses manual hook-on and manual hook-off to achieve the connection and separation of mine cars, and the connection between mine cars mostly uses pin shafts and round-link chains or three-link chains and universal chains. After the mine car arrives, the operator uses his back to push or hands to spread the mine car apart, and then manually pulls out the cylindrical pin shaft to complete the hook-off of the mine car. Most of the hook-off mine cars are heavy-duty mine cars, and usually more than two people are required to complete the hook-off operation of the mine car, which has great potential safety hazards and is likely to cause personal injuries. When hooking on, the operator also needs to use his back to push or hands to spread the mine car apart. The operator bends down, puts the round-link chain into the socket groove with one hand, and holds the cylindrical pin with the other hand. After the hole and the pin are aligned, inserts the cylindrical pin to complete the hook-on of the mine car. Similarly, there are great potential safety hazards and it is easy to cause personal injuries. Moreover, the mine car is not allowed to run during the hook-on and hook-off operations, so personal injuries are often caused by the malfunction of the mine car. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: In order to overcome the above technical problems, the present invention provides an automatic hook-on and hook-off rotary connection device for mine cars.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an automatic hook-on and hook-off rotary connection device for a mine car, including a U-shaped hook base, a hook, and a hook reset device. The U-shaped hook base includes a hook base body, a main shaft, a bearing, a hook mounting seat, and a driving arc plate. The hook base body, the hook mounting seat, and the driving arc plate are fixedly connected. The main shaft is passed through the hook base body and is connected to the hook base body through a bearing. The hook mounting seat and the driving arc plate are respectively located on both sides of the hook base body. The driving arc plate has a smooth surface facing the hook mounting seat. The smooth surface extends out of the hook base body and gradually inclines towards the center axis direction of the main shaft from the end far away from the hook base body to the end close to the hook base body. The smooth surface is a plane or an arc surface. The hook includes a hook main vertical plate and a hook upper horizontal plate. The hook main vertical plate is rotatably connected to the hook mounting seat through a hook reset device. The hook upper horizontal plate is arranged at the end of the hook main vertical plate far away from the main shaft. After the hook upper horizontal plate is connected to the hook main vertical plate, it has a part protruding out of the hook main vertical plate. The part of the hook upper horizontal plate protruding out of the hook main vertical plate is the protruding part. The protruding part faces the driving arc plate and the surface of the protruding part is a plane. The hook upper horizontal plate has a abutting surface, and the abutting surface is located on the opposite side of the protruding part. The automatic hook-on and hook-off rotary connection devices for mine cars are used in pairs. The two paired automatic hook-on and hook-off rotary connection devices for mine cars are respectively assembled at the connection ends of the two mine cars. The centers of the automatic hook-on and hook-off rotary connection devices on the two mine cars are symmetric. When the two mine cars approach, the abutting surface of one mine car contacts and abuts against the smooth surface of the other mine car, so that the protruding parts of the automatic hook-on and hook-off rotary connection devices of the two mine cars rotate towards the center axis direction of the main shaft. After rotation, the protruding parts of the two automatic hook-on and hook-off rotary connection devices for mine cars are hooked to each other.

[0005] The hook base body, the hook mounting seat, and the driving arc plate are integrally cast into a U shape.

[0006] The U-shaped hook base further includes a connecting pin shaft. The hook main vertical plate is rotatably connected to the hook mounting seat through the connecting pin shaft.

[0007] It further includes a hook locking device. The hook locking device includes a locking shaft, an upper spring, a lower spring, a positioning shaft sleeve, an upper roller, and a lower roller. The locking shaft has a middle boss. The upper spring and the lower spring are both sleeved on the locking shaft. The top end of the upper spring is fixed relative to the locking shaft. The bottom end of the upper spring abuts against the upper surface of the middle boss of the locking shaft. The bottom end of the lower spring is fixed relative to the locking shaft. The top end of the lower spring abuts against the lower surface of the middle boss of the locking shaft. The upper spring, the lower spring, and the locking shaft are located in the positioning shaft sleeve. The upper roller and the lower roller are respectively arranged at both ends of the locking shaft. The locking shaft is arranged vertically, and the positioning shaft sleeve is fixed to the U-shaped hook base.

[0008] It also includes a decoupling and opening device, which includes a sloped unlocking plate, and the sloped unlocking plate is tilted to form a slope.

[0009] The hook also includes a lower horizontal plate of the hook, and the upper horizontal plate and the lower horizontal plate of the hook are respectively located at the two ends of the main vertical plate of the hook. The main vertical plate of the hook, the upper horizontal plate of the hook, and the lower horizontal plate of the hook are welded together or cast as a whole into a Z shape. The main vertical plate of the hook is assembled between the hook mounting seats through a connecting pin shaft.

[0010] The hook also includes an arc plate and a positioning arc plate, the positioning arc plate is connected to the lower horizontal plate of the hook through the arc plate, and the positioning arc plate is connected to the hook locking device, the hook main vertical plate, the hook upper horizontal plate, the hook lower horizontal plate, the arc plate and the positioning arc plate are welded together or integrally cast into a Z shape, the positioning arc plate is located at the outer circle of the arc plate, and the curvature of the positioning arc plate is smaller than that of the arc plate, the positioning arc plate and the arc plate are transitioned through an oblique side surface, the middle boss of the locking shaft intersects with the rotating surface of the positioning arc plate, and the middle boss of the locking shaft is tangent to the rotating surface of the arc plate, before hooking, the upper surface of the positioning arc plate abuts against the lower surface of the middle boss of the locking shaft, and after hooking, the hook rotates to make the positioning arc plate disengage from the lower surface of the middle boss of the locking shaft, and the middle boss of the locking shaft contacts the oblique side surface and the arc surface of the arc plate.

[0011] The hook resetting device comprises a resetting spring, one end of which is connected to the hook mounting seat, and the other end of which is connected to the hook.

[0012] It also includes a hanger fixing seat, which includes a fixing plate and a main positioning pin. The fixing plate is provided with a plurality of through holes, and a positioning steel ball and a positioning spring are arranged in the through holes. One end of the positioning spring is connected to the fixing seat body through the fixing plate, and the other end of the positioning spring abuts against the positioning steel ball. The fixing seat body is connected to the U-shaped hook base through the main positioning pin. The U-shaped hook base is provided with a plurality of grooves on one side facing the fixing seat body, and the positioning steel ball abuts against the grooves.

[0013] It also includes a mine car connection buffer device, which includes a mine car screw mounting plate, a screw sleeve, a screw and a buffer spring. The screw is inserted into the screw sleeve, one end of the screw and one end of the screw sleeve abut against the mine car screw mounting plate, the mine car screw mounting plate is fixed to the fixed seat body, the buffer spring sleeve is arranged on the screw, one end of the buffer spring abuts against the other end of the screw sleeve, and the other end of the buffer spring is relatively fixed to the screw.

[0014] The beneficial effects of the present invention are as follows. An automatic hook-on and hook-off rotary connection device for mine cars of the present invention enables the mine cars to perform automatic hook-on and hook-off operations during operation without the need for operator participation; the lapping surface is a plane, with a large contact surface, impact resistance, and stable lapping; the mine car does not unhook during tipping and unloading, and the hook can rotate 360° with the mine car. A rotary surface automatic positioning structure is designed between the hook fixing seat and the U-shaped hook base, and the design of the positioning steel ball and the positioning spring and the groove realizes the automatic positioning of the rotary surface. The plane of the U-shaped hook base after rotating 360° with the mine car is automatically positioned in the horizontal position state. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is a schematic structural diagram of the automatic hook-on and hook-off rotary connection device for mine cars of the present invention.

[0017] Figure 2 is Figure 1 a partial enlarged view of part A in

[0018] Figure 3 is a schematic structural diagram of the cooperation between the hook locking device and the hook-off opening device of the automatic hook-on and hook-off rotary connection device for mine cars of the present invention.

[0019] Figure 4 is a schematic diagram of the state after the hook of the automatic hook-on and hook-off rotary connection device for mine cars of the present invention rotates 45°.

[0020] Figure 5 is a schematic structural diagram of two pairs of the automatic hook-on and hook-off rotary connection devices for mine cars of the present invention.

[0021] In the figure, 1. hook base body, 2. main shaft, 3. bearing, 4. hook mounting seat, 5. driving arc plate, 5-1. smooth surface, 6. hook main vertical plate, 7. hook upper cross plate, 7-1. convex part, 7-2. abutting surface, 8. connecting pin shaft, 9. hook lower cross plate, 10. return spring, 11. arc plate, 12. positioning arc plate, 12-1. inclined side surface, 13. locking shaft, 13-1. middle boss, 14. upper spring, 15. lower spring, 16. positioning shaft sleeve, 17. upper roller, 18. lower roller, 19. inclined surface unlocking plate, 20. fixed seat body, 21. main positioning pin, 22. positioning steel ball, 23. positioning spring, 24. groove, 25. mine car screw mounting plate, 26. screw sleeve, 27. screw, 28. buffer spring, 29. fixing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, and therefore only showing the components related to the present invention.

[0023] As Figures 1-5 shown, an automatic hook-on / hook-off rotary connection device for a mine car of the present invention includes a U-shaped hook base, a hook, and a hook reset device. The U-shaped hook base includes a hook base body 1, a main shaft 2, a bearing 3, a hook mounting seat 4, and a driving arc plate 5. The hook base body 1, the hook mounting seat 4, and the driving arc plate 5 are fixedly connected. The main shaft 2 is disposed within the hook base body 1, and the main shaft 2 is connected to the hook base body 1 through the bearing 3. The hook mounting seat 4 and the driving arc plate 5 are respectively located on both sides of the hook base body 1. The driving arc plate 5 has a smooth surface 5-1 facing the hook mounting seat 4. The smooth surface 5-1 extends out of the hook base body 1, and the smooth surface 5-1 gradually inclines towards the central axis direction of the main shaft 2 from the end far away from the hook base body 1 to the end close to the hook base body 1. The smooth surface 5-1 is a plane or a curved surface.

[0024] The hook includes a hook main vertical plate 6 and a hook upper horizontal plate 7. The hook main vertical plate 6 is rotatably connected to the hook mounting seat 4 through the hook reset device. The hook upper horizontal plate 7 is disposed at the end of the hook main vertical plate 6 far away from the main shaft 2. After the hook upper horizontal plate 7 is connected to the hook main vertical plate 6, a part of it protrudes outward from the hook main vertical plate 6, and the part of the hook upper horizontal plate 7 protruding outward from the hook main vertical plate 6 is an outward protruding part 7-1. The outward protruding part 7-1 faces the driving arc plate 5 and the surface of the outward protruding part 7-1 is a plane. The hook upper horizontal plate 7 has a abutting surface 7-2, and the abutting surface 7-2 is located on the opposite side of the outward protruding part 7-1.

[0025] The automatic hook-on / hook-off rotary connection devices for mine cars of the present invention are used in pairs. The two paired automatic hook-on / hook-off rotary connection devices for mine cars are respectively assembled at the connection ends of the two mine cars. As Figure 5 shown, the automatic hook-on / hook-off rotary connection devices for mine cars on the two mine cars are centrosymmetric. When the two mine cars approach, the abutting surface 7-2 of one mine car contacts and abuts against the smooth surface 5-1 of the other mine car, causing the outward protruding parts 7-1 of the automatic hook-on / hook-off rotary connection devices for mine cars of the two mine cars to rotate towards the central axis direction of the main shaft 2. After rotation, the outward protruding parts 7-1 of the two automatic hook-on / hook-off rotary connection devices for mine cars are hooked to each other.

[0026] The hook base body 1, the hook mounting seat 4, and the driving arc plate 5 are integrally cast into a U shape.

[0027] The U-shaped hook base further includes a connecting pin shaft 8. The hook main vertical plate 6 is rotatably connected to the hook mounting seat 4 through the connecting pin shaft 8. The outward protruding part 7-1 can rotate around the connecting pin shaft 8 towards the central axis direction of the main shaft 2. The connecting pin shaft 8 is vertically disposed and is perpendicular to the main shaft 2.

[0028] It further includes a hook locking device, which includes a locking shaft 13, an upper spring 14, a lower spring 15, a positioning shaft bushing 16, an upper roller 17 and a lower roller 18. The locking shaft 13 has a middle boss 13-1. Both the upper spring 14 and the lower spring 15 are sleeved on the locking shaft 13. The top end of the upper spring 14 is fixed relative to the locking shaft 13, and the bottom end of the upper spring 14 abuts against the upper surface of the middle boss 13-1 of the locking shaft 13. The bottom end of the lower spring 15 is fixed relative to the locking shaft 13, and the top end of the lower spring 15 abuts against the lower surface of the middle boss 13-1 of the locking shaft 13. The upper spring 14, the lower spring 15 and the locking shaft 13 are located within the positioning shaft bushing 16. The upper roller 17 and the lower roller 18 are respectively arranged at both ends of the locking shaft 13. The locking shaft 13 is arranged vertically, and the positioning shaft bushing 16 is fixed to the U-shaped hook base. The locking shaft 13 is parallel to the connecting pin shaft 8.

[0029] It further includes a hook unlocking device, which includes an inclined unlocking plate 19, and the inclined unlocking plate 19 is inclined to form a slope surface. As Figure 3 shown, the hook unlocking device includes two inclined unlocking plates 19 with opposite inclination directions on the left and right, and the hook unlocking device is installed at the place where the hook needs to be unlocked on the mine car running track.

[0030] The hook further includes a lower cross plate 9 of the hook. The upper cross plate 7 of the hook and the lower cross plate 9 of the hook are respectively located at both ends of the main vertical plate 6 of the hook. The main vertical plate 6 of the hook, the upper cross plate 7 of the hook and the lower cross plate 9 of the hook are jointly welded or integrally cast into a Z shape, and the main vertical plate 6 of the hook is assembled to the hook mounting seat 4 through the connecting pin shaft 8.

[0031] The hook further includes an arc plate 11 and a positioning arc plate 12. The positioning arc plate 12 is connected to the lower cross plate 9 of the hook through the arc plate 11, and the positioning arc plate 12 is connected to the hook locking device. The main vertical plate 6 of the hook, the upper cross plate 7 of the hook, the lower cross plate 9 of the hook, the arc plate 11 and the positioning arc plate 12 are jointly welded or integrally cast into a Z shape. The positioning arc plate 12 is located on the outer circle of the arc plate 11, and the radian of the positioning arc plate 12 is smaller than that of the arc plate 11. The positioning arc plate 12 and the arc plate 11 are transitioned through an inclined side surface 12-1. The middle boss 13-1 of the locking shaft 13 intersects with the rotating surface of the positioning arc plate 12, and the middle boss 13-1 of the locking shaft 13 is tangent to the rotating surface of the arc plate 11. Before hooking, the upper surface of the positioning arc plate 12 abuts against the lower surface of the middle boss 13-1 of the locking shaft 13. After hooking, the hook rotates to make the positioning arc plate 12 disengage from the lower surface of the middle boss 13-1 of the locking shaft 13, and the middle boss 13-1 of the locking shaft 13 contacts the inclined side surface 12-1 and the arc surface of the arc plate 11. The arc diameter at the positioning arc plate 12 is larger than the diameter of the arc plate 11. In this embodiment, the arc diameter at the positioning arc plate 12 is 10 mm larger than the diameter of the arc plate 11. As Figure 4As shown, when the hook collides, the positioning arc plate 12 rotates clockwise about 45° with the hook. After that, the upper surface of the positioning arc plate 12 disengages from the lower surface of the middle boss 13-1 of the locking shaft 13. At the same time, the locking shaft 13 contacts the arc surface of the arc plate 11. Under the action of the upper spring 14 and the lower spring 15, the locking shaft 13 resets and drops to contact the inclined side surface 12-1 of the positioning arc plate 12. The locking shaft 13 is at the arc of the arc plate 11 to clamp the inclined side surface 12-1 of the positioning arc plate 12, locking the hook. When the hook runs onto the inclined surface unlocking plate 19, the lower roller 18 rolls along the inclined surface, driving the locking shaft 13 to move upward and disengage from the inclined side surface 12-1 of the positioning arc plate 12. The hook rotates counterclockwise 45° under the action of the reset spring 10. At the same time, the positioning arc plate 12 also rotates counterclockwise 45°. The middle boss 13-1 of the locking shaft 13 is on the upper surface of the positioning arc plate 12, unlocking the hook.

[0032] The hook reset device includes a reset spring 10. The reset spring 10 is a torsion spring. One end of the reset spring 10 is connected to the hook mounting seat 4, and the other end of the reset spring 10 is connected to the hook. As Figure 1 shown, the hook reset device is composed of a reset spring 10, a double-hole fixing plate, a single-slot hole fixing plate and mounting bolts, and is assembled into the middle slot of the Z-shaped hook device. The double-hole fixing plate is welded in the middle slot of the Z-shaped hook device, and the single-slot hole fixing plate is fixed to the side of the Z-shaped hook mounting seat 4 of the U-shaped hook base with bolts.

[0033] It also includes a hanger fixing seat. The hanger fixing seat includes a fixing plate 29 and a main positioning pin 21. A plurality of through holes are provided on the fixing plate 29. Positioning steel balls 22 and positioning springs 23 are arranged in the through holes. One end of the positioning spring 23 is connected to the fixing seat body 20 through the fixing plate 29, and the other end of the positioning spring 23 abuts against the positioning steel ball 22. The fixing seat body 20 is connected to the U-shaped hook base through the main positioning pin 21. A plurality of grooves 24 are provided on one side of the U-shaped hook base facing the fixing seat body 20, and the positioning steel balls 22 abut against the grooves 24. As Figures 1-2 shown, after being connected to the U-shaped hook base through the main shaft 2, bearings 3, retaining rings, locking round nuts and stop washers, positioning steel balls 22, positioning springs 23 and spring fixing plates are respectively assembled in the six through holes of the fixing plate 29. Two groups of positioning holes are provided on the fixing seat body 20 and the U-shaped hook base, and the main positioning pins 21 are assembled in the two groups of positioning holes.

[0034] It also includes a mine car connection buffer device, which includes a mine car screw mounting plate 25, a screw sleeve 26, a screw 27, and a buffer spring 28. The screw 27 is inserted into the screw sleeve 26. One end of the screw 27 and one end of the screw sleeve 26 abut against the mine car screw mounting plate 25. The mine car screw mounting plate 25 is fixed to the fixed seat body 20. The buffer spring 28 is sleeved on the screw 27. One end of the buffer spring 28 abuts against the other end of the screw sleeve 26, and the other end of the buffer spring 28 is relatively fixed to the screw 27. After assembly, the mine car screw mounting plate 25 is welded to the fixed seat body 20 on site.

[0035] For the automatic hook-on and hook-off rotary connection device of the mine car of the present invention, when the automatic hook-on and hook-off rotary device of the mine car is not hooked, the Z-shaped hook is in an open state of 45°. When two mine cars run into each other, under the action of inertia, the Z-shaped hook rotates 45° to automatically hook under the extrusion of the driving arc plate 5. At the same time, the locking shaft 13 locks the positioning arc plate 12 and the Z-shaped hook under the action of the upper spring 14 and the lower spring 15 to complete the locking of the hook and ensure that the automatic hook-on and hook-off rotary device does not come off. When the mine car runs to the hook-off area provided with a hook-off opening device, the lower roller 18 of one of the mine cars rolls on the inclined unlocking plate 19, and the lower rollers 18 of the two mine cars roll on the two inclined unlocking plates 19. Then the lower roller 18 rolling on the inclined unlocking plate 19 is lifted, thereby lifting the locking shaft 13 and unlocking the positioning arc plate 12, and the two hooks are disengaged from each other and rotate 45° under the action of the return spring 10 in the hook return device to complete the hook-off action. When the mine car enters the dumper for ore unloading, the automatic hook-on and hook-off rotary device on one mine car rotates 360° with the mine car under the action of the main positioning pin 21. The automatic hook-on and hook-off rotary device on the other mine car is not provided with the main positioning pin 21, and the fixed seat body 20 and the U-shaped hook base can rotate. After the U-shaped hook base on this mine car rotates 360° around the main shaft 2 and completes the flip under the action of the positioning spring 23 and the positioning steel ball 22, the automatic positioning of the fixed seat body 20 and the U-shaped hook base is completed.

[0036] The automatic hook-on and hook-off rotary connection device of the mine car of the present invention has the following advantages:

[0037] 1. The Z-shaped hook automatically engages when moving towards each other.

[0038] 2. The U-shaped hook base can automatically position the hook within a certain range in the up, down, left, and right directions according to the size of the Z-shaped hook, and the whole can rotate 360° with the mine car after engagement.

[0039] 3. After the Z-shaped hook is engaged, a hook locking device is provided in the U-shaped hook base to axially lock the Z-shaped hook, and the Z-shaped hook does not fall off when the mine car is running;

[0040] 4. The engagement hook locking device and the hook disengaging and opening device operate in opposite directions to automatically disengage. After unlocking, the Z-shaped hook rotates 45° by the action of the hook reset device to release the connection, and the mine car is separated.

[0041] 5. A rotating surface automatic positioning structure is designed between the hanger fixing seat and the U-shaped hook base. The design of the positioning steel ball 22, the positioning spring 23 and the groove 24 realizes the automatic positioning of the rotating surface. The plane of the U-shaped hook base after rotating 360° with the mine car is automatically positioned in the horizontal position state.

[0042] Based on the ideal embodiments of the present invention as described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic hook-on and hook-off rotary connection device for a mine car, characterized in that, It includes a U-shaped hook base, a hook and a hook reset device. The U-shaped hook base includes a hook base body (1), a main shaft (2), a bearing (3), a hook mounting seat (4) and a driving arc plate (5). The hook base body (1), the hook mounting seat (4) and the driving arc plate (5) are fixedly connected. The main shaft (2) is arranged in the hook base body (1), and the main shaft (2) is connected to the hook base body (1) through the bearing (3). The hook mounting seat (4) and the driving arc plate (5) are respectively located on both sides of the hook base body (1). The driving arc plate (5) has a smooth surface (5-1) facing the hook mounting seat (4). The smooth surface (5-1) extends out of the hook base body (1), and the smooth surface (5-1) gradually inclines towards the central axis direction of the main shaft (2) from the end far away from the hook base body (1) to the end close to the hook base body (1). The smooth surface (5-1) is a plane or an arc surface. The hook includes a hook main vertical plate (6) and a hook upper horizontal plate (7). The hook main vertical plate (6) is rotatably connected to the hook mounting seat (4) through a hook reset device. The hook upper horizontal plate (7) is arranged at the end of the hook main vertical plate (6) far away from the main shaft (2). After the hook upper horizontal plate (7) is connected to the hook main vertical plate (6), it has a part protruding out of the hook main vertical plate (6). And the part of the hook upper horizontal plate (7) protruding out of the hook main vertical plate (6) is a protruding part (7-1). The protruding part (7-1) faces the driving arc plate (5) and the surface of the protruding part (7-1) is a plane. The hook upper horizontal plate (7) has a abutting surface (7-2), and the abutting surface (7-2) is located on the opposite side of the protruding part (7-1). The paired use of the automatic hook-on and hook-off rotary connection device for mine cars. Two paired automatic hook-on and hook-off rotary connection devices for mine cars are respectively assembled at the connection ends of two mine cars. The centers of the automatic hook-on and hook-off rotary connection devices on the two mine cars are symmetric. When the two mine cars approach, the abutting surface (7-2) of one mine car contacts and abuts against the smooth surface (5-1) of the other mine car, so that the protruding parts (7-1) of the automatic hook-on and hook-off rotary connection devices of the two mine cars rotate towards the central axis direction of the main shaft (2). After rotation, the protruding parts (7-1) of the two automatic hook-on and hook-off rotary connection devices for mine cars are hooked to each other.

2. The automatic hook-on / hook-off rotary connection device for mine cars according to claim 1, characterized in that, The hook base body (1), the hook mounting seat (4) and the driving arc plate (5) are integrally cast into a U shape.

3. The automatic hooking and unhooking rotary connection device for mine cars according to claim 1, characterized in that, The U-shaped hook base further includes a connecting pin shaft (8). The hook main vertical plate (6) is rotatably connected to the hook mounting seat (4) through the connecting pin shaft (8).

4. The automatic hook-on and hook-off rotary connection device for a mine car according to claim 1, characterized in that, It further includes a hook locking device, and the hook locking device includes a locking shaft (13), an upper spring (14), a lower spring (15), a positioning shaft bushing (16), an upper roller (17) and a lower roller (18). The locking shaft (13) has a middle boss (13-1). The upper spring (14) and the lower spring (15) are both sleeved on the locking shaft (13). The top end of the upper spring (14) is fixed relative to the locking shaft (13), and the bottom end of the upper spring (14) abuts against the upper surface of the middle boss (13-1) of the locking shaft (13). The bottom end of the lower spring (15) is fixed relative to the locking shaft (13), and the top end of the lower spring (15) abuts against the lower surface of the middle boss (13-1) of the locking shaft (13). The upper spring (14), the lower spring (15) and the locking shaft (13) are located inside the positioning shaft bushing (16). The upper roller (17) and the lower roller (18) are respectively arranged at both ends of the locking shaft (13). The locking shaft (13) is vertically arranged, and the positioning shaft bushing (16) is fixed to the U-shaped hook base.

5. The automatic hook-on and hook-off rotary connection device for a mine car according to claim 4, characterized in that It further includes a hook release device, and the hook release device includes an inclined unlocking plate (19), and the inclined unlocking plate (19) is inclined to form a slope surface.

6. The automatic hook-on / hook-off rotary connection device for a mine car according to claim 4, characterized in that, The hook further includes a lower cross plate (9) of the hook. The upper cross plate (7) and the lower cross plate (9) of the hook are respectively located at both ends of the main vertical plate (6) of the hook. The main vertical plate (6) of the hook, the upper cross plate (7) and the lower cross plate (9) of the hook are jointly welded or integrally cast into a Z shape. The main vertical plate (6) of the hook is assembled to the hook mounting seat (4) through a connecting pin shaft (8).

7. The automatic hook-on and disengagement rotary connection device for a mine car according to claim 6, characterized in that The hook further includes an arc plate (11) and a positioning arc plate (12). The positioning arc plate (12) is connected to the lower cross plate (9) of the hook through the arc plate (11). The positioning arc plate (12) is connected to the hook locking device. The main vertical plate (6) of the hook, the upper cross plate (7), the lower cross plate (9), the arc plate (11) and the positioning arc plate (12) are jointly welded or integrally cast into a Z shape. The positioning arc plate (12) is located on the outer circle of the arc plate (11), and the radian of the positioning arc plate (12) is smaller than that of the arc plate (11). The positioning arc plate (12) and the arc plate (11) are transitioned through an inclined side surface (12-1). The middle boss (13-1) of the locking shaft (13) intersects with the rotating surface of the positioning arc plate (12). The middle boss (13-1) of the locking shaft (13) is tangent to the rotating surface of the arc plate (11). Before hooking, the upper surface of the positioning arc plate (12) abuts against the lower surface of the middle boss (13-1) of the locking shaft (13). After hooking, the hook rotates to make the positioning arc plate (12) disengage from the lower surface of the middle boss (13-1) of the locking shaft (13), and the middle boss (13-1) of the locking shaft (13) contacts the inclined side surface (12-1) and the arc surface of the arc plate (11).

8. The automatic hook-on and disengagement rotary connection device for mine cars according to claim 1, characterized in that, The hook reset device includes a reset spring (10). One end of the reset spring (10) is connected to the hook mounting seat (4), and the other end of the reset spring (10) is connected to the hook.

9. The automatic hook-on / hook-off rotary connection device for mine cars according to claim 1, characterized in that, It further includes a hanger fixing seat, and the hanger fixing seat includes a fixing plate (29) and a main positioning pin (21). A plurality of through holes are formed in the fixing plate (29), and positioning steel balls (22) and positioning springs (23) are arranged in the through holes. One end of the positioning spring (23) is connected to the fixing seat body (20) through the fixing plate (29), and the other end of the positioning spring (23) abuts against the positioning steel ball (22). The fixing seat body (20) is connected to the U-shaped hook base through the main positioning pin (21). A plurality of grooves (24) are formed on one side of the U-shaped hook base facing the fixing seat body (20), and the positioning steel balls (22) abut against the grooves (24).

10. The automatic hook-on / hook-off rotary connection device for a mine car according to claim 1, characterized in that, It further includes a mine car connection buffer device, and the mine car connection buffer device includes a mine car screw mounting plate (25), a screw sleeve (26), a screw (27) and a buffer spring (28). The screw (27) is arranged in the screw sleeve (26), one end of the screw (27) and one end of the screw sleeve (26) abut against the mine car screw mounting plate (25), the mine car screw mounting plate (25) is fixed to the fixing seat body (20), the buffer spring (28) is sleeved on the screw (27), one end of the buffer spring (28) abuts against the other end of the screw sleeve (26), and the other end of the buffer spring (28) is relatively fixed to the screw (27).

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