Electro-pneumatic combined braking device

Abstract

The utility model relates to the field of combined braking equipment, and discloses an electric-pneumatic combined braking device which comprises a fixing seat, a supporting frame, an ejector rod, an electric-hydraulic push rod and an air cylinder. The supporting frame is fixed to the fixing base, the ejector rod is rotationally connected to the supporting frame, the electric-hydraulic push rod and the air cylinder are rotationally installed on the fixing base, guide rods are arranged on a piston rod of the electric-hydraulic push rod and a piston rod of the air cylinder, through grooves are formed in the guide rods, and two rotating shafts are arranged on the ejector rod. The two rotating shafts are respectively inserted into the through groove of the piston rod of the electric-hydraulic push rod and the through groove of the piston rod of the air cylinder; a locking mechanism is installed in the through groove, and the rotating shaft can be fixed to any position in the through groove through the locking mechanism. The rotating shaft can be positioned in the through groove through the locking mechanism, the rotating shaft does not need to move from the lower end of the through groove to the upper end of the through groove in the process from loosening to locking of the band-type brake wheel, the action stroke of the electric-hydraulic push rod and the air cylinder is shortened, the time from loosening of the band-type brake wheel to locking of the band-type brake wheel is short, and the steelmaking efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combined braking equipment, and more specifically, to an electric-pneumatic combined braking device. Background Art

[0002] The utility model patent with the authorization announcement number CN216585048U discloses an electric-pneumatic combined brake device and a blast furnace swing chute, which relates to the technical field of blast furnace ironmaking auxiliary equipment. In the device, one end of the fixed end brake is connected to the fixed seat, one end of the movable end brake is rotatably connected to the fixed seat, the brake wheel is arranged between the fixed end brake and the movable end brake, one end of the adjustment rod is rotatably connected to the end of the fixed end brake away from the fixed seat, the electro-hydraulic push rod is fixedly connected to the fixed seat, the cylinder is fixedly connected to the fixed seat, the push rod is rotatably connected to the movable end brake, the adjustment rod, the fixed seat, the piston rod of the electro-hydraulic push rod and the piston rod of the cylinder respectively, and the electric brake and the pneumatic brake are realized in parallel by the cooperation of the electro-hydraulic push rod and the cylinder. When an electrical fault occurs, the pneumatic brake can be immediately changed to the pneumatic brake, and the position does not need to be manually switched. The operation is simple and quick, which can effectively avoid adverse consequences, such as the accident of molten iron falling due to the failure of the swing chute brake, and ensure the safety of iron tapping in front of the furnace.

[0003] In the above scheme, when an electrical failure occurs, the cylinder drives one end of the push rod to move upward, and the other end of the push rod moves downward to release the brake wheel. In order not to drive the piston rod of the electro-hydraulic push rod to move when the cylinder moves, a longer through groove is set at the end of the piston rod of the electro-hydraulic push rod. Similarly, in order not to drive the piston rod of the cylinder to move when the electro-hydraulic push rod moves, a longer through groove is also set at the end of the piston rod of the cylinder. In the process of loosening to locking the brake wheel, the top end of the through groove at the end of the piston rod of the electric-hydraulic push rod needs to act on the fourth point, and the top end of the through groove at the end of the piston rod of the cylinder needs to act on the fifth point to drive the push rod to move and lock the brake wheel. The electro-hydraulic push rod and the cylinder have long moving strokes, resulting in a long time from loosening the brake wheel to locking the brake wheel, affecting steelmaking efficiency. Utility Model Content

[0004] The utility model aims to overcome the defects of the above-mentioned prior art and provide an electric-pneumatic combined brake device for solving the technical problem that the electro-hydraulic push rod and the cylinder have a long action stroke, resulting in a long time from releasing the brake wheel to locking the brake wheel, thus affecting the steelmaking efficiency.

[0005] The technical solution adopted by the utility model is an electric-pneumatic combined braking device, which is mainly used for locking or releasing the brake wheel, and comprises a fixed seat, a support frame, a push rod, an electro-hydraulic push rod and a cylinder; the support frame is fixed on the fixed seat, the push rod is rotatably connected to the support frame, the electro-hydraulic push rod and the cylinder are respectively rotatably installed on the fixed seat, the piston rod of the electro-hydraulic push rod and the piston rod of the cylinder are both provided with guide rods, the guide rods are provided with through grooves, the push rod is provided with two rotating shafts, the two rotating shafts are respectively inserted into the through grooves of the piston rod of the electric-hydraulic push rod and the through grooves of the piston rod of the cylinder; a locking mechanism is installed in the through groove, and the rotating shaft can be fixed at any position in the through groove by the locking mechanism.

[0006] Under normal conditions, when the rotating shaft in the electro-hydraulic push rod slot is at the lower end of the slot, the locking mechanism in the electro-hydraulic push rod slot fixes the rotating shaft inside it, and the locking mechanism in the cylinder guide rod slot does not fix the rotating shaft inside it. At this time, it is equivalent to that the piston rod of the electro-hydraulic push rod is rotatably connected to the push rod, and the piston rod of the cylinder will not restrict the push rod, which is equivalent to using the electro-hydraulic push rod alone to drive the push rod to move and realize the fixing and release of the brake wheel; when the electro-hydraulic push rod is damaged, on the contrary, the locking mechanism in the cylinder slot fixes the rotating shaft at the bottom end of the slot, and the electro-hydraulic push rod is The locking mechanism in the groove does not fix the internal rotating shaft. At this time, it is equivalent to that the piston rod of the cylinder is rotationally connected to the push rod, and the piston rod of the electro-hydraulic push rod will not restrict the push rod, which is equivalent to using the cylinder alone to drive the push rod to move, so as to achieve the locking and release of the brake wheel. In summary, the rotating shaft can be positioned in the through groove through the locking mechanism. In the process of loosening to locking the brake wheel, there is no need for the rotating shaft to move from the lower end of the through groove to the upper end of the through groove, which shortens the action stroke of the electro-hydraulic push rod and the cylinder, and the time used from loosening the brake wheel to locking the brake wheel is short, which can effectively improve the steelmaking efficiency.

[0007] Furthermore, the locking mechanism includes a gear, a rack and an automatic locking assembly, a gear is rotatably connected to the rotating shaft, a rack is provided on the inner wall of one side of the through slot along its length direction, the gear is meshed with the rack, and an automatic locking assembly that can move along its length direction is provided in the through slot for locking the gear. When the electro-hydraulic push rod is damaged, the automatic locking assembly in the through slot of its piston rod does not lock its internal gear, and the rotating shaft in its through slot can move along the length direction of the through slot; while the automatic locking assembly in the through slot of the cylinder piston rod locks its internal gear, the gear cannot rotate, the gear teeth abut against the rack teeth, and the rotating shaft cannot move in the through slot. When the cylinder piston rod moves, the push rod can be directly driven to move through the rack, gear and rotating shaft, without the need for the rotating shaft to move to the upper end of the through slot; on the contrary, when the cylinder moves alone, the push rod can be directly driven to move, without the need for the rotating shaft to move to the upper end of the through slot, and the time taken from releasing to locking the brake wheel is short, which can effectively shorten the braking time and improve the steelmaking efficiency.

[0008] Furthermore, the distance between the side of the gear away from the rack and the side wall of the through slot opposite to it is not greater than the height of the gear teeth. If it is greater than the height of the gear teeth, even if the automatic locking assembly locks the gear so that it cannot rotate, due to the large width of the through slot, when subjected to force, the gear will slip out of the rack tooth groove, making it impossible to position the rotating shaft.

[0009] Furthermore, the automatic locking assembly includes a mounting housing, an electromagnet and a locking pin. The mounting housing is arranged in a through slot and can move along the length direction of the through slot. The locking pin is movably mounted on the mounting housing. The locking pin has a first end and a second end. The first end of the locking pin is plugged into and matched with the tooth groove of the gear. The second end of the locking pin is fixed with a magnet. The electromagnet is mounted on the mounting housing and arranged opposite to the magnet. When locking is not required, the electromagnet generates an attractive force on the magnet to pull the locking pin out of the tooth groove of the gear. When locking is required, the electromagnet generates a repulsive force on the magnet to insert the locking pin into the tooth groove of the gear to achieve locking of the gear.

[0010] Furthermore, the installation housing is provided with a socket, the locking pin is inserted into the socket on the installation housing, and a spring is connected between the second end of the locking pin and the installation housing. In a natural state, the spring drives the locking pin to retract into the installation housing, the electromagnet is not energized, the locking pin will not be plugged into the tooth groove on the gear, and the gear will not be locked. The gear can move along the rack in the through groove. When locking is required, the electromagnet is energized, and the electromagnet repels the magnet, thereby pushing the locking pin to slide out of the socket of the installation housing and insert into the tooth groove of the gear to lock the gear.

[0011] Furthermore, a guide wheel is provided on one side of the installation housing, a guide groove is provided on one side of the through groove, and the guide wheel is arranged in the guide groove. The guide wheel and the guide groove are in rolling cooperation, and the friction force is small, which makes it easier for the gear to push the installation housing upward to move.

[0012] Furthermore, the width of the installation shell is equal to the width of the through slot. Because the installation shell has a certain thickness and the width of the installation shell is equal to the width of the through slot, when moving in the through slot, the inner wall surface of the through slot and the two side surfaces of the installation shell form sliding friction, preventing one side of the installation shell from tilting and causing jamming.

[0013] Furthermore, a vertical notch is provided on the mandrel, one end of the rotating shaft is rotatably connected to one side wall of the vertical notch, the other end of the rotating shaft is rotatably connected to the other side wall of the vertical notch, and the guide rod passes through the vertical notch. Directly opening a longer vertical notch on the mandrel makes it more convenient to install the guide rod and the rotating shaft, reduces the material used for the mandrel, and can save manufacturing costs.

[0014] Furthermore, the axis of the electro-hydraulic push rod, the axis of the cylinder and the center axis of the support frame are in the same plane. When in motion, the connection between the electro-hydraulic push rod and the push rod, the connection between the cylinder and the push rod, and the connection between the support frame and the push rod move in the same plane, and the friction force at the connection is small, which can effectively increase the service life of the brake device.

[0015] Furthermore, two rotatable rotating seats are installed on the fixed seat, and the electro-hydraulic push rod and the cylinder are installed on the two rotating seats respectively. The height of the rotating seat where the cylinder is located is greater than the height of the rotating seat where the electro-hydraulic push rod is located, because the cylinder is far away from the support frame, and a higher rotating seat is used so that the top end of the cylinder piston rod can push the push rod to produce more displacement.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: when the electro-hydraulic push rod is working normally, when the rotating shaft in the electro-hydraulic push rod slot is located at the lower end of the slot, the locking mechanism in the electro-hydraulic push rod slot fixes the rotating shaft inside it, and the locking mechanism in the cylinder guide rod slot does not fix the rotating shaft inside it. At this time, it is equivalent to that the piston rod of the electro-hydraulic push rod is rotatably connected to the push rod, and the piston rod of the cylinder will not restrict the push rod, which is equivalent to using the electro-hydraulic push rod alone to drive the push rod to move to achieve the fixing and release of the brake wheel; when the electro-hydraulic push rod is damaged, on the contrary, the locking mechanism in the cylinder slot will fix the rotating shaft Fixed at the bottom end of the through slot, the locking mechanism in the through slot of the electro-hydraulic push rod does not fix the internal rotating shaft, which is equivalent to the piston rod of the cylinder being rotatably connected to the push rod. The piston rod of the electro-hydraulic push rod will not restrict the push rod, which is equivalent to using the cylinder alone to drive the push rod to move, so as to achieve the locking and release of the brake wheel; in summary, the rotating shaft can be positioned in the through slot through the locking mechanism, and the rotating shaft does not need to move from the lower end of the through slot to the upper end of the through slot in the process of loosening to locking the brake wheel, which shortens the action stroke of the electro-hydraulic push rod and the cylinder, and the time used from loosening the brake wheel to locking the brake wheel is short, which can effectively improve the steelmaking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the locking mechanism of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the automatic locking assembly of the utility model.

[0020] In the figure: 1, fixed seat, 2, support frame, 3, push rod, 4, electro-hydraulic push rod, 5, cylinder, 6, guide rod, 7, through groove, 8, rotating shaft, 9, locking mechanism, 10, gear, 11, rack, 12, automatic locking assembly, 13, mounting shell, 14, electromagnet, 15, locking pin, 16, spring, 17, guide wheel, 18, guide groove, 19, vertical notch, 20, rotating seat. DETAILED DESCRIPTION

[0021] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0022] like Figure 1 As shown, the present scheme discloses an electric-pneumatic combined braking device, comprising a fixed seat 1, a support frame 2, a push rod 3, an electro-hydraulic push rod 4 and a cylinder 5; the support frame 2 is fixed on the fixed seat 1, the push rod 3 is rotatably connected to the support frame 2, the electro-hydraulic push rod 4 and the cylinder 5 are respectively rotatably installed on the fixed seat 1, the piston rod of the electro-hydraulic push rod 4 and the piston rod of the cylinder 5 are both provided with guide rods 6, and the guide rods 6 are provided with through grooves 7, and the push rod 3 is provided with two rotating shafts 8, which are respectively inserted into the through grooves 7 of the piston rod of the electro-hydraulic push rod 4 and the piston rod of the cylinder 5; a locking mechanism 9 is installed in the through groove 7, and the rotating shaft 8 can be fixed at any position in the through groove 7 through the locking mechanism 9.

[0023] Under normal conditions, when the rotating shaft 8 in the through groove 7 of the electro-hydraulic push rod 4 is located at the lower end of the through groove 7, the locking mechanism 9 in the through groove 7 of the electro-hydraulic push rod 4 fixes the rotating shaft 8 inside it, and the locking mechanism 9 in the through groove 7 of the guide rod 6 of the cylinder 5 does not fix the rotating shaft 8 inside it. At this time, it is equivalent to that the piston rod of the electro-hydraulic push rod 4 is rotatably connected with the push rod 3, and the piston rod of the cylinder 5 does not restrict the push rod 3, which is equivalent to using the electro-hydraulic push rod 4 alone to drive the push rod 3 to move to achieve the fixing and release of the brake wheel; when the electro-hydraulic push rod 4 is damaged, on the contrary, the locking mechanism 9 in the through groove 7 of the cylinder 5 fixes the rotating shaft 8 to the bottom end of the through groove 7, The locking mechanism 9 in the through groove 7 of the electro-hydraulic push rod 4 does not fix the internal rotating shaft 8. At this time, it is equivalent to that the piston rod of the cylinder 5 is rotatably connected to the push rod 3, and the piston rod of the electro-hydraulic push rod 4 will not restrict the push rod 3, which is equivalent to using the cylinder 5 alone to drive the push rod 3 to move, so as to achieve the locking and release of the brake wheel; in summary, the rotating shaft 8 can be positioned in the through groove 7 through the locking mechanism 9, and in the process of loosening to locking the brake wheel, there is no need for the rotating shaft to move from the lower end of the through groove 7 to the upper end of the through groove 7, which shortens the action stroke of the electro-hydraulic push rod and the cylinder, and the time used from loosening the brake wheel to locking the brake wheel is short, which can effectively improve the steelmaking efficiency.

[0024] A vertical notch 19 is provided on the top rod 3, one end of the rotating shaft 8 is rotatably connected to one side wall of the vertical notch 19, the other end of the rotating shaft 8 is rotatably connected to the other side wall of the vertical notch 19, and the guide rod 6 passes through the vertical notch 19. Directly opening a relatively long vertical notch 19 on the top rod 3 makes it more convenient to install the guide rod 6 and the rotating shaft 8, reduces the material used for the top rod 3, and can save manufacturing costs. After the rotating shaft 8 is installed, the top rod 3 is a frame structure with sufficient structural strength.

[0025] The axis of the electric hydraulic push rod 4, the axis of the cylinder 5 and the center axis of the support frame 2 are in the same plane. When in motion, the connection between the electric hydraulic push rod 4 and the push rod 3, the connection between the cylinder 5 and the push rod 3, and the connection between the support frame 2 and the push rod 3 move in the same plane, and the friction force at the connection is small, which can effectively improve the service life of the brake device.

[0026] Two rotatable rotating seats 20 are installed on the fixed seat 1, and the electro-hydraulic push rod 4 and the cylinder 5 are respectively installed on the two rotating seats 20. The height of the rotating seat 20 where the cylinder 5 is located is greater than the height of the rotating seat 20 where the electro-hydraulic push rod 4 is located, because the cylinder 5 is far away from the support frame 2, and a higher rotating seat 20 is used so that the top end of the piston rod of the cylinder 5 can push the push rod 3 to produce more displacement.

[0027] like Figure 2 As shown, the locking mechanism 9 includes a gear 10, a rack 11 and an automatic locking assembly 12. The gear 10 is rotatably connected to the rotating shaft 8. The inner wall of one side of the through slot 7 is provided with a rack 11 along its length direction. The gear 10 is meshed with the rack 11. The through slot 7 is provided with an automatic locking assembly 12 that can move along its length direction for locking the gear 10. When the electro-hydraulic push rod 4 is damaged, the automatic locking assembly 12 in its piston rod through slot 7 does not lock its internal gear 10, and the rotating shaft 8 in its through slot 7 can move along the length direction of the through slot 7; while the automatic locking assembly 12 in the cylinder 5 piston rod through slot 7 locks its internal gear 10, and the gear 10 cannot rotate. The teeth of the gear 10 abut against the teeth of the rack 11, and the rotating shaft 8 cannot move in the through slot 7. When the piston rod of the cylinder 5 moves, the push rod 3 can be directly driven to move through the rack 11, the gear 10 and the rotating shaft 8 without rotating. The shaft 10 moves to the upper end of the through slot 7; on the contrary, when the electro-hydraulic push rod 4 is normal, the automatic locking component 12 in the electro-hydraulic push rod 4 locks the gear 10 in the piston rod through slot 7, and the automatic locking component 12 in the piston rod of the cylinder 5 does not lock the gear 10 inside it, and the rotating shaft 8 in the piston rod through slot 7 of the cylinder 5 can move in the through slot 7; when the cylinder 5 acts alone, it can directly drive the push rod 3 to move, and there is no need for the rotating shaft 8 to move to the upper end of the through slot 7. The time taken from loosening to locking the brake wheel is short, which can effectively shorten the braking time and improve the steelmaking efficiency.

[0028] The distance between the side of the gear 10 away from the rack 11 and the side wall of the through slot 7 opposite to it is not greater than the height of the teeth on the gear 10. When it is greater than the height of the teeth on the gear 10, even if the automatic locking assembly 12 locks the gear 10 so that it cannot rotate, due to the large width of the through slot 7, when the gear 10 is subjected to force, it will slip out of the tooth groove of the rack 11, making it impossible to position the rotating shaft 8; when the distance between the side of the gear 10 away from the rack 11 and the side wall of the through slot 7 opposite to it is not greater than the height of the teeth on the gear 10, the gear 10 is always meshed with the rack 11 and cannot be disengaged from the rack 11.

[0029] like Figure 3 As shown, the automatic locking assembly 12 includes a mounting shell 13, an electromagnet 14 and a locking pin 15. The mounting shell 13 is arranged in the through slot 7 and can move along the length direction of the through slot 7; the locking pin 15 is movably mounted on the mounting shell 13, and the locking pin 15 has a first end and a second end. The first end of the locking pin 15 is plug-fitted with the tooth groove of the gear 10; the second end of the locking pin 15 is fixed with a magnet, and the electromagnet 14 is mounted on the mounting shell 13 and arranged opposite to the magnet. When locking is not required, the electromagnet 14 generates suction force on the magnet to pull the locking pin 15 out of the tooth groove of the gear 10. When locking is required, the electromagnet 14 generates repulsive force on the magnet to insert the locking pin 15 into the tooth groove of the gear 10 to achieve locking of the gear 10. When locking is not required, the locking pin 15 moves and retracts into the mounting shell 13, and the gear 10 can push the mounting shell 13 to move when it moves up and down in the through groove 7. In this way, the automatic locking of the gear 10 can be achieved by automatically controlling the electromagnet 14, which has a high degree of automation and is more convenient to use.

[0030] Specifically, the mounting housing 13 is provided with a socket, the locking pin 15 is inserted into the socket on the mounting housing 13, and a spring 16 is connected between the second end of the locking pin 15 and the mounting housing 13. In a natural state, the spring 16 drives the locking pin 15 to retract into the mounting housing 13, the electromagnet 14 is not energized, the locking pin 15 will not be plugged into the tooth groove on the gear 10, and the gear 10 will not be locked. The gear 10 can move in the through groove 7 along the rack 11. When locking is required, the electromagnet 14 is energized, and the electromagnet 14 repel the magnet, thereby pushing the locking pin 15 to slide out of the socket of the mounting housing 13 and insert into the tooth groove of the gear 10 to lock the gear 10.

[0031] Specifically, a guide wheel 17 is provided on one side of the mounting housing 13, and a guide groove 18 is provided on one side of the through groove 7, and the guide wheel 17 is arranged in the guide groove 18. The guide wheel 17 and the guide groove 18 are rollingly matched, and the friction force is small, which makes it easier for the gear 10 to push the mounting housing 13 upward to move.

[0032] The width of the mounting housing 13 is equal to the width of the through slot 7. Because the mounting housing 13 has a certain thickness and the width of the mounting housing 13 is equal to the width of the through slot 7, when moving in the through slot 7, the inner wall surface of the through slot 7 forms sliding friction with the two side surfaces of the mounting housing 13, preventing one side of the mounting housing 13 from tilting and causing jamming.

[0033] Instructions for use: Under normal conditions, when the rotating shaft 8 in the through groove 7 of the guide rod 6 of the electro-hydraulic push rod 4 is located at the lower end of the through groove 7, the locking mechanism 9 in the through groove 7 of the guide rod 6 of the electro-hydraulic push rod 4 locks the rotating shaft 8 inside it so that it cannot rotate, and the locking mechanism 9 in the through groove 7 of the guide rod 6 of the cylinder 5 will not lock the rotating shaft 8 inside it, which is equivalent to the piston rod of the electro-hydraulic push rod 4 being rotatably connected to the push rod 3, and the piston rod of the cylinder 5 will not restrict the push rod 3, which is equivalent to using the electro-hydraulic push rod 4 alone to drive the push rod 3 to move to achieve the locking and release of the brake wheel; when the electro-hydraulic push rod 4 is damaged, the opposite operation is performed, and when the rotating shaft 8 in the through groove 7 of the guide rod 6 of the cylinder 5 is located at the lower end of the through groove 7, the through groove of the guide rod 6 of the cylinder 5 The locking mechanism 9 in 7 locks the rotating shaft 8 inside it so that it cannot rotate, and the locking mechanism 9 in the through groove 7 of the guide rod 6 of the electro-hydraulic push rod 4 does not lock the rotating shaft 8 inside it, which is equivalent to that the piston rod of the cylinder 5 is rotatably connected with the push rod 3, and the piston rod of the electro-hydraulic push rod 4 will not restrict the push rod 3, which is equivalent to using the cylinder 5 alone to drive the push rod 3 to move and finally achieve the locking and release of the brake wheel; in summary, when the electro-hydraulic push rod 4 and the cylinder 5 in this scheme work alone, there is no need to move the rotating shaft from the lower end of the through groove 7 to the upper end of the through groove 7 during the process of loosening to locking the brake wheel, which shortens the action stroke of the electro-hydraulic push rod and the cylinder, and the time taken from loosening the brake wheel to locking the brake wheel is short, which can effectively improve the steelmaking efficiency.

[0034] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. An electric-pneumatic combined braking device, characterized in that: The invention comprises a fixed seat (1), a support frame (2), a push rod (3), an electro-hydraulic push rod (4) and a cylinder (5); the support frame (2) is fixed on the fixed seat (1), the push rod (3) is rotatably connected to the support frame (2), the electro-hydraulic push rod (4) and the cylinder (5) are respectively rotatably mounted on the fixed seat (1), the piston rod of the electro-hydraulic push rod (4) and the piston rod of the cylinder (5) are both provided with guide rods (6), the guide rods (6) are provided with through grooves (7), the push rod (3) is provided with two rotating shafts (8), the two rotating shafts (8) are respectively inserted into the through grooves (7) of the piston rod of the electro-hydraulic push rod (4) and the through grooves (7) of the piston rod of the cylinder (5); a locking mechanism (9) is installed in the through groove (7), and the rotating shaft (8) can be fixed at any position in the through groove (7) by the locking mechanism (9); The locking mechanism (9) comprises a gear (10), a rack (11) and an automatic locking assembly (12); the gear (10) is rotatably connected to the rotating shaft (8); a rack (11) is provided on an inner wall of one side of the through slot (7) along its length direction; the gear (10) is meshed with the rack (11); an automatic locking assembly (12) is provided in the through slot (7) and can move along its length direction, and is used to lock the gear (10).

2. An electric-pneumatic combined brake device according to claim 1, characterized in that: The distance between the side of the gear (10) away from the rack (11) and the side wall of the through slot (7) opposite to it is not greater than the height of the teeth on the gear (10).

3. An electric-pneumatic combined brake device according to claim 1, characterized in that: The automatic locking assembly (12) comprises a mounting shell (13), an electromagnet (14) and a locking pin (15); the mounting shell (13) is arranged in a through slot (7) and can move along the length direction of the through slot (7); the locking pin (15) is movably mounted on the mounting shell (13); the locking pin (15) has a first end and a second end; the first end of the locking pin (15) is plug-fitted with a tooth groove of a gear (10); the second end of the locking pin (15) is fixed with a magnet; the electromagnet (14) is mounted on the mounting shell (13) and is arranged opposite to the magnet.

4. An electric-pneumatic combined brake device according to claim 3, characterized in that: The mounting shell (13) is provided with a plug hole, the locking pin (15) is plugged into the plug hole on the mounting shell (13), and a spring (16) is connected between the second end of the locking pin (15) and the mounting shell (13).

5. The electric-pneumatic combined brake device according to claim 3, characterized in that: A guide wheel (17) is provided on one side of the mounting housing (13), a guide groove (18) is provided on one side of the through groove (7), and the guide wheel (17) is arranged in the guide groove (18).

6. An electric-pneumatic combined brake device according to claim 3, characterized in that: The width of the installation housing (13) is equal to the width of the through slot (7).

7. The electric-pneumatic combined brake device according to claim 1, characterized in that: A vertical notch (19) is provided on the top rod (3); one end of the rotating shaft (8) is rotatably connected to one side wall of the vertical notch (19); the other end of the rotating shaft (8) is rotatably connected to the other side wall of the vertical notch (19); and the guide rod (6) passes through the vertical notch (19).

8. The electric-pneumatic combined brake device according to claim 1, characterized in that: The axis of the electro-hydraulic push rod (4), the axis of the cylinder (5) and the central axis of the support frame (2) are in the same plane.

9. The electric-pneumatic combined brake device according to claim 1, characterized in that: Two rotatable rotating seats (20) are mounted on the fixed seat (1), and the electro-hydraulic push rod (4) and the cylinder (5) are mounted on the two rotating seats (20) respectively.

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