Swing rod limiting device

Abstract

The invention relates to a limiting device, in particular to a swing rod limiting device which comprises a support, an automatic locking pin assembly, an arrow holding pin assembly and a limiting plate, the limiting plate comprises a connecting end and a limiting end, a pin hole is formed in the limiting end, the automatic locking pin assembly comprises an automatic locking pin, and the arrow holding pin assembly comprises an arrow holding pin. When the arrow holding pin penetrates through the second through hole to block the first edge of the sector plate, the automatic locking pin does not move downwards, and when the arrow holding pin moves downwards to penetrate through the second through hole and extend into the pin hole, the automatic locking pin moves downwards to the bottom of the automatic locking pin to make contact with the sector plate. When the automatic locking pin moves downwards to penetrate through the first through hole to block the second edge of the fan-shaped plate, the arrow holding pin moves upwards in place. According to the invention, the swing rod can be reliably limited, locked and unlocked at different stations, so that the swing rod is prevented from swinging by mistake.

Description

Technical Field

[0001] The invention relates to a limiting device, in particular to a swing rod limiting device. Background Art

[0002] The umbilical tower of the rocket launch platform is used to lay various pipelines for filling, gas supply, cables, etc. During transportation, the umbilical arm keeps the various pipelines, connectors, and cables unchanged. The umbilical tower of the launch platform is connected to a swing arm. Before and after the rocket takes off, the swing arm drives the detached connectors, pipelines, joints, etc. to swing to a safe range. The existing swing arm cannot be locked in a limited position during the transfer transportation, hoisting process, and at different angles after entering the launch process. The swing arm may swing incorrectly, causing the swing arm to collide with the rocket or other unexpected situations. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a swing rod limiting device which can reliably limit and lock the swing rod in different working positions and reliably unlock the swing rod to prevent the swing rod from swinging incorrectly.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The swing arm limiting device of the present invention comprises a bracket, an automatic locking pin assembly, an arrow-holding pin assembly, and a limiting plate, wherein the bracket comprises a first plate body, the first plate body is a flat plate, the first plate body is horizontally arranged, the limiting plate comprises a connecting end and a limiting end, the connecting end is provided with a connecting hole, the connecting hole is used to connect the swing arm, the limiting end is a fan-shaped plate, the fan-shaped plate is provided with a pin hole, the automatic locking pin assembly and the arrow-holding pin assembly are both connected to the bracket, the automatic locking pin assembly comprises an automatic locking pin, the arrow-holding pin assembly comprises an arrow-holding pin, the automatic locking pin and the arrow-holding pin are both vertically arranged, the automatic locking pin and the arrow-holding pin are both suitable for moving up and down and locking their positions when moving downward into position, and the first plate body is provided with a first through hole and a second through hole The first through hole and the second through hole correspond to the automatic locking pin and the arrow-holding pin respectively. When the arrow-holding pin moves downward, it passes through the second through hole and is blocked at the first edge of the fan-shaped plate or extends into the pin hole. When the automatic locking pin moves downward, it passes through the first through hole and is blocked at the second edge of the fan-shaped plate. When the arrow-holding pin passes through the second through hole and is blocked at the first edge of the fan-shaped plate, the automatic locking pin has not moved downward yet. When the arrow-holding pin moves downward, passes through the second through hole and extends into the pin hole, the automatic locking pin moves downward to the bottom of the automatic locking pin and contacts the fan-shaped plate. When the automatic locking pin moves downward, passes through the first through hole and is blocked at the second edge of the fan-shaped plate, the arrow-holding pin moves upward into position.

[0006] Furthermore, the arrow-holding pin assembly also includes an arrow-holding pin cylinder, an arrow-holding pin support, and an arrow-holding pin connecting frame. The arrow-holding pin support is connected to the support, the arrow-holding pin cylinder is connected to the arrow-holding pin support, one end of the arrow-holding pin connecting frame is hinged to the piston rod of the arrow-holding pin cylinder, and the other end is hinged to the arrow-holding pin. When the piston rod of the arrow-holding pin cylinder is extended, it drives the arrow-holding pin to move downward, and the arrow-holding pin passes through the second through hole.

[0007] Furthermore, the arrow-holding pin assembly also includes an arrow-holding pin spring, the arrow-holding pin support includes a support base plate, the arrow-holding pin passes through the support base plate, the arrow-holding pin spring is sleeved on the arrow-holding pin, and the arrow-holding pin spring is located between the arrow-holding pin connecting frame and the support base plate.

[0008] Furthermore, a first limiting boss is provided on the arrow-holding pin, and when the arrow-holding pin moves downward through the second through hole and blocks the first edge of the fan-shaped plate or extends into the pin hole, the first limiting boss abuts against the first plate body.

[0009] Furthermore, the automatic locking pin assembly also includes an automatic locking pin oil cylinder, an automatic locking pin support, an automatic locking pin connecting frame, and an automatic locking pin spring, the automatic locking pin support is connected to the bracket, the automatic locking pin oil cylinder is connected to the automatic locking pin support, the upper end of the automatic locking pin connecting frame is hinged with the automatic locking pin oil cylinder, and the automatic locking pin connecting frame includes a lower support ear, both of the lower support ears are provided with a through hole extending along the length direction, the upper end of the automatic locking pin is connected with a sliding pin, the two ends of the sliding pin are respectively arranged in one of the through holes, the sliding pin is suitable for moving up and down relative to the through hole, the automatic locking pin is provided with a second limiting boss, the automatic locking pin spring is sleeved on the automatic locking pin, the automatic locking pin spring is located between the bottom plate of the automatic locking pin support and the second limiting boss, and when the automatic locking pin moves downward through the first through hole and is blocked at the second edge of the fan-shaped plate, the second limiting boss abuts against the first plate body.

[0010] Furthermore, the automatic locking pin connection frame also includes an upper end support ear, and the automatic locking pin connection frame is hinged to the piston rod of the automatic locking pin cylinder through the upper end support ear.

[0011] Furthermore, the bracket also includes a second plate body, the second plate body is a flat plate, the second plate body is horizontally arranged, the second plate body is connected to the first plate body, and a third through hole and a fourth through hole are arranged on the second plate body, the third through hole corresponds to the first through hole, and the fourth through hole corresponds to the second through hole, the fan-shaped plate is clamped between the first plate body and the second plate body, and the arrow-holding pin passes through the second through hole and the fourth through hole when moving downward and is blocked at the first edge of the fan-shaped plate or passes through the second through hole, the pin hole, and the fourth through hole in sequence, and the automatic locking pin passes through the first through hole and the third through hole when moving downward and is blocked at the second edge of the fan-shaped plate.

[0012] Furthermore, the first through hole, the second through hole, the third through hole, the fourth through hole, and the pin hole on the limiting plate are all square holes, and the bottom of the automatic locking pin and the bottom of the arrow holding pin are both square columns.

[0013] Furthermore, the limiting plate further comprises a plurality of reinforcing ribs, wherein the reinforcing ribs are connected between the connecting end and the limiting end, and the plurality of reinforcing ribs are sequentially arranged along the circumference of the connecting end.

[0014] Furthermore, the first through hole and the second through hole are located at different radial positions of the sector plate.

[0015] Compared with the prior art, the swing rod limiting device of the present invention has at least the following beneficial effects:

[0016] The swing arm limiting device of the present invention comprises a bracket, an automatic locking pin assembly, an arrow-holding pin assembly and a limiting plate. The automatic locking pin assembly comprises an automatic locking pin, and the arrow-holding pin assembly comprises an arrow-holding pin. Both the automatic locking pin and the arrow-holding pin are suitable for moving up and down and locking their positions when they move downward into position. When the arrow-holding pin passes through the second through hole and blocks at the first edge of the fan-shaped plate, the automatic locking pin has not yet moved downward. When the arrow-holding pin moves downward through the second through hole and extends into a pin hole, the automatic locking pin moves downward until the bottom of the automatic locking pin contacts the fan-shaped plate. When the automatic locking pin moves downward through the first through hole and blocks at the second edge of the fan-shaped plate, the arrow-holding pin moves upward into position. Therefore, the swing arm can be reliably limited, locked and unlocked in multiple positions such as the arrow-holding state, the small-angle swing-open state, and the swing-open state, thereby preventing the swing arm from swinging by mistake or the swing arm from being unable to swing.

[0017] The swing rod limiting device of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the swing rod limiting device of the present invention;

[0019] Figure 2It is an isometric view of the swing arm limiting device of the present invention;

[0020] Figure 3 It is a front view of the swing rod limiting device of the present invention;

[0021] Figure 4a It is a front view of some components of the arrow-holding pin assembly in the swing arm limiting device of the present invention;

[0022] Figure 4b It is an isometric side view of some components of the arrow-holding pin assembly in the swing arm limiting device of the present invention;

[0023] Figure 5a It is a front view of some components of the automatic locking assembly in the swing rod limiting device of the present invention;

[0024] Figure 5b It is an isometric side view of some components of the automatic locking assembly in the swing rod limiting device of the present invention;

[0025] Figure 6a It is a schematic diagram of the arrow-holding pin in the swing arm limiting device of the present invention in a locked state;

[0026] Figure 6b It is a schematic diagram of the arrow-holding pin in the swing lever limiting device of the present invention in the unlocked state;

[0027] Figure 7a It is a schematic diagram of the automatic locking pin in the swing rod limiting device of the present invention in the unlocked state;

[0028] Figure 7b It is a schematic diagram of the automatic locking pin in the swing rod limiting device of the present invention in a state ready for automatic locking;

[0029] Figure 7c It is a schematic diagram of the automatic locking pin in the swing rod limiting device of the present invention in the state of automatic locking in place;

[0030] Figure 8a It is a top view of the swing rod limiting device of the present invention in the arrow holding state;

[0031] Figure 8b It is an isometric side view of the swing rod limiting device of the present invention in the arrow-holding state;

[0032] Figure 9a It is a schematic diagram of the top view of the swing rod limit device of the present invention in a state of swinging at a small angle;

[0033] Figure 9b It is an isometric side view of the swing rod limit device of the present invention in a state of swinging open at a small angle;

[0034] Fig.10a It is a schematic diagram of the top view of the swing rod limiting device of the present invention in the swing-open position state;

[0035] Fig.10b It is an isometric view of the swing arm limiting device of the present invention in the swing-open position state. DETAILED DESCRIPTION

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 8a As shown, a swing arm limiting device of the present invention includes a bracket 01, an automatic locking pin assembly 02, an arrow holding pin assembly 03, and a limiting plate 04. The bracket 01 includes a first plate body 11, the first plate body 11 is a flat plate, and the first plate body 11 is horizontally arranged. The limiting plate 04 includes a connecting end and a limiting end. The connecting end is provided with a connecting hole 41, and the connecting hole 41 is used to connect the swing arm main shaft. The limiting end is a fan-shaped plate 42, and the fan-shaped plate 42 is provided with one or more pin holes 421. The automatic locking pin assembly 02 and the arrow holding pin assembly 03 are both connected to the bracket 01. The automatic locking pin assembly 02 includes an automatic locking pin 21, and the arrow holding pin assembly 03 includes an arrow holding pin 31. The automatic locking pin 21 and the arrow holding pin 31 are both vertically arranged. The automatic locking pin 21 and the arrow holding pin 31 are both suitable for moving up and down and locking in position when moving downward. The first plate body 11 is provided with a first through hole and a second through hole, and the first through hole and the second through hole correspond to the automatic locking pin 21 and the arrow pin 31 respectively. When the arrow pin 31 moves downward, it passes through the second through hole and is blocked at the first edge of the fan-shaped plate 42 or extends into the pin hole 421. When the automatic locking pin 21 moves downward, it passes through the first through hole and is blocked at the second edge of the fan-shaped plate 42. When the arrow pin 31 passes through the second through hole and is blocked at the first edge of the fan-shaped plate 42, the automatic locking pin 21 has not moved downward yet. When the arrow pin 31 moves downward, passes through the second through hole and extends into a pin hole 421, the automatic locking pin 21 moves downward until the bottom of the automatic locking pin 21 contacts the fan-shaped plate 42. When the automatic locking pin 21 moves downward, passes through the first through hole and is blocked at the second edge of the fan-shaped plate 42, the arrow pin 31 moves upward into place.

[0037] When the swing rod connected to the limit plate 04 is in the arrow holding state, Figure 8a , Figure 8b As shown, the arrow holding pin 31 moves downward through the second through hole to block the first edge of the sector plate 42 and fits with the first edge. At this time, the arrow holding pin 31 is in a locked state and plays a limiting role. The first edge of the sector plate 42 is the left edge. At this time, the operations such as docking the rocker connectors with the rocket can be carried out, which can effectively prevent the rocker drive mechanism from malfunctioning and causing the rocker to swing open by mistake; when entering the launch process, the arrow holding pin 31 moves upward and retracts, the arrow holding pin 31 is unlocked, and the rocker connected to the limit plate 04 is ready to swing open. At this time, the automatic locking pin 21 is retracted;

[0038] When the swing arm connected to the limit plate 04 is in a small angle swing state, Figure 9a , Figure 9b As shown, the arrow holding pin 31 moves upward and retracts, so that the limit plate 04 is unlocked. When the swing arm swings to a certain small angle, the pin hole 421 on the sector plate 42 is aligned with the second through hole on the first plate body 11, and the arrow holding pin 31 moves downward and passes through the second through hole and the pin hole 421 to complete the locking action. At this time, the arrow body hoisting and other operations can be carried out; at this time, the automatic locking pin 21 moves downward, and when the lower end of the automatic locking pin 21 hits the upper surface of the sector plate 42, the automatic locking pin 21 stops moving downward and is in a state of waiting for automatic locking;

[0039] When the swing rod connected to the limit plate 04 is in the swing-open position, Fig.10a , Fig.10b As shown, the automatic locking pin 21 has been offset from the fan-shaped plate 42 and is no longer constrained by the fan-shaped plate 42. The automatic locking pin 21 automatically extends and fits with the right edge of the fan-shaped plate 42. At this time, the automatic locking pin 21 is locked and plays a limiting role. The right edge of the fan-shaped plate 42 is the second edge. At this time, the arrow holding pin 31 is retracted. The automatic locking pin 21 fits with the right edge of the fan-shaped plate 42, which can effectively prevent the phenomenon of the swing arm driving mechanism malfunctioning and causing the swing arm to swing back by mistake. When the launch mission is completed, the automatic locking pin 21 moves upward and is retracted into the second through hole of the first plate body 11 of the bracket 01 to achieve unlocking. At this time, the swing arm can be swung back.

[0040] The present invention provides a swing arm limiting device, which includes a bracket 01, an automatic locking pin assembly 02, an arrow holding pin assembly 03, and a limiting plate 04. The automatic locking pin assembly 02 includes an automatic locking pin 21, and the arrow holding pin assembly 03 includes an arrow holding pin 31. The automatic locking pin 21 and the arrow holding pin 31 are both suitable for moving up and down and locking in position when moving downward into position. When the arrow holding pin 31 passes through the second through hole and blocks at the first edge of the fan-shaped plate 42, the automatic locking pin 21 has not moved downward yet. When the arrow holding pin 31 moves downward through the second through hole and extends into a pin hole 421, the automatic locking pin 21 moves downward until the bottom of the automatic locking pin 21 contacts the fan-shaped plate 42. When the automatic locking pin 21 moves downward through the first through hole and blocks at the second edge of the fan-shaped plate 42, the arrow holding pin 31 moves upward into position. Therefore, the swing arm can be reliably limited and locked and reliably unlocked in multiple positions such as the arrow holding state, the small-angle swinging state, and the swinging into position state, so as to prevent the swing arm from swinging by mistake or the swing arm from being unable to swing.

[0041] Alternatively, if Figure 3 , Figure 4a , Figure 4bAs shown, the arrow pin assembly 03 also includes an arrow pin cylinder 32, an arrow pin support 33, and an arrow pin connecting frame 34. The arrow pin support 33 is connected to the bracket 01, and the arrow pin cylinder 32 is connected to the arrow pin support 33. One end of the arrow pin connecting frame 34 is hinged to the piston rod of the arrow pin cylinder 32, and the other end is hinged to the arrow pin 31. When the piston rod of the arrow pin cylinder 32 is extended, the arrow pin 31 is driven to move downward, and the arrow pin 31 passes through the second through hole. Specifically, the arrow pin support 33 is connected to the first plate body 11 of the bracket 01 by bolts, and the arrow pin cylinder 32 is connected to the arrow pin support 33 by bolts. The arrow pin cylinder 32 is vertically arranged. When the piston rod of the arrow pin cylinder 32 is extended, the arrow pin 31 is extended through the arrow pin connecting frame 34. The arrow-holding pin assembly 03 includes an arrow-holding pin oil cylinder 32, which enables the arrow-holding pin 31 to be automatically extended and retracted, which is conducive to automated remote monitoring and reduces human operation.

[0042] Optionally, the arrow pin assembly 03 also includes an arrow pin spring 35, the arrow pin support 33 includes a support bottom plate 331, the arrow pin 31 passes through the support bottom plate 331, the arrow pin spring 35 is sleeved on the arrow pin 31, and the arrow pin spring 35 is located between the arrow pin connecting frame 34 and the support bottom plate 331. Specifically, the arrow pin support 33 is a frame-shaped structure, including a support top plate, a support bottom plate 331 and two support side plates, and the arrow pin cylinder 32 is connected to the support top plate. When the piston rod of the arrow pin cylinder 32 is extended, the arrow pin spring 35 is compressed by the arrow pin connecting frame 34 to extend the arrow pin 31. When the arrow pin 31 moves downward, it passes through the second through hole and is blocked at the first edge of the fan-shaped plate 42 or extends into the pin hole 421. At this time, the arrow pin 31 is in a locked state, such as Figure 6a As shown, when the piston rod of the arrow pin cylinder 32 is retracted, the arrow pin 31 moves upward and retracts into the second through hole under the action of the arrow pin spring 35. At this time, the arrow pin 31 is in the unlocked state, as shown in FIG. Figure 6b Due to the setting of the arrow pin spring 35, the arrow pin 31 can be provided with a continuous upward force, effectively preventing the arrow pin 31 from being extended by mistake due to abnormal conditions such as leakage of the arrow pin cylinder 32, resulting in the risk that the swing arm cannot be swung open.

[0043] Optionally, a first limiting boss 311 is provided on the arrow pin 31. When the arrow pin 31 moves downward through the second through hole and is blocked at the first edge of the fan-shaped plate 42 or extends into the pin hole 421, the first limiting boss 311 abuts against the first plate body 11. The first limiting boss 311 limits the extreme position of the downward movement of the arrow pin 31, thereby avoiding the situation where the arrow pin 31 cannot be limited when moving downward due to an abnormality in the arrow pin cylinder 32.

[0044] Alternatively, if Figure 3 , Figure 5a , Figure 5bAs shown, the automatic locking pin assembly 02 also includes an automatic locking pin cylinder 22, an automatic locking pin support 23, an automatic locking pin connecting frame 24, and an automatic locking pin spring 25. The automatic locking pin support 23 is connected to the bracket 01, the automatic locking pin cylinder 22 is connected to the automatic locking pin support 23, the upper end of the automatic locking pin connecting frame 24 is hinged to the automatic locking pin cylinder 22, and the automatic locking pin connecting frame 24 includes lower end support ears, and both lower end support ears are provided with through holes extending in the length direction. The upper end of the automatic locking pin 21 is connected to the sliding pin 21 1. The sliding pin 211 is a horizontally arranged rod, and both ends of the sliding pin 211 are respectively arranged in a through hole. The sliding pin 211 is suitable for moving up and down relative to the through hole. The automatic locking pin 21 is provided with a second limiting boss 212. The automatic locking pin spring 25 is sleeved on the automatic locking pin 21. The automatic locking pin spring 25 is located between the bottom plate of the automatic locking pin support 23 and the second limiting boss 212. When the automatic locking pin 21 moves downward through the first through hole and is blocked at the second edge of the fan-shaped plate 42, the second limiting boss 212 abuts against the first plate body 11. Specifically, the automatic locking pin support 23 is a frame structure, including a top plate, a bottom plate, and two side plates. The automatic locking pin cylinder 22 is connected to the top plate by bolts. The automatic locking pin cylinder 22 is vertically arranged. The bottom plate of the automatic locking pin support 23 is connected to the first plate body 11 of the bracket 01 by bolts. The automatic locking pin connection frame 24 also includes an upper end support ear. The automatic locking pin connection frame 24 is hinged to the piston rod of the automatic locking pin cylinder 22 through the upper end support ear. When the automatic locking pin cylinder 22 is retracted, the automatic locking pin 21 is pulled by the automatic locking pin connection frame 24 to retract the automatic locking pin 21 into the first through hole on the bracket 01 to achieve the unlocking action. At the same time, the automatic locking pin spring 25 is compressed to store elastic potential energy, such as Figure 7a As shown, when the piston rod of the automatic locking pin cylinder 22 extends, it drives the automatic locking pin connecting frame 24 to move downward. When the lower end of the automatic locking pin 21 hits the upper surface of the fan-shaped plate 42, the automatic locking pin 21 stops moving downward, and the sliding pin 211 on the automatic locking pin 21 moves upward in the through holes on both sides of the automatic locking pin connecting frame 24. The through holes on both sides of the automatic locking pin connecting frame 24 form sliding grooves until the piston rod of the automatic locking pin cylinder 22 extends into place. At this time, the sliding pin 211 is located at the uppermost end of the through holes on both sides of the automatic locking pin connecting frame 24, and the automatic locking pin 21 is in a state of waiting for automatic locking. Figure 7b As shown, when the swing rod connected to the limit plate 04 is swung open, the sector plate 42 and the automatic locking pin 21 are no longer in contact, and the automatic locking pin 21 moves downward under the force of the automatic locking pin spring 25 to automatically lock, pass through the first through hole and block at the second edge of the sector plate 42, thereby achieving a locking action. Figure 7cAs shown. A locking sensor 27 is provided on the top of the automatic locking pin 21. The locking sensor 27 is used to detect whether the automatic locking pin 21 has been locked in place. When the automatic locking pin is locked in place, it indicates that the swing arm is normally opened. The swing arm limit device of the present invention has an automatic locking assembly including an automatic locking pin oil cylinder 22. The automatic locking cylinder 22 drives the automatic locking pin 21 to move up and down, thereby realizing the automatic extension and retraction of the automatic locking pin 21, which is conducive to automated remote duty and reduces human operation. Through holes are provided on both sides of the automatic locking pin connection frame 24, so that the automatic locking pin 21 has a certain free travel, thereby realizing the automatic locking of the limit device after the swing arm is swung into place.

[0045] Optionally, the bracket 01 further includes a second plate 12, which is a flat plate. The second plate 12 is horizontally arranged, connected to the first plate 11, and provided with a third through hole and a fourth through hole. The third through hole corresponds to the first through hole, and the fourth through hole corresponds to the second through hole. The fan-shaped plate 42 is clamped between the first plate 11 and the second plate 12. When the arrow-holding pin 31 moves downward, it passes through the second through hole and the fourth through hole and is blocked at the first edge of the fan-shaped plate 42, or passes through the second through hole, the pin hole 421, and the fourth through hole in sequence. When the automatic locking pin 21 moves downward, it passes through the first through hole and the third through hole and is blocked at the second edge of the fan-shaped plate 42. Since the bracket 01 further includes the second plate 12, the fan-shaped plate 42 is clamped between the first plate 11 and the second plate 12, so that the structure of the swing arm limit device of the present invention is more stable.

[0046] Optionally, the first through hole, the second through hole, the third through hole, the fourth through hole, and the pin hole 421 on the limiting plate 04 are all square holes, and the bottom of the automatic locking pin 21 and the bottom of the arrow pin 31 are both square columns, which prevents the automatic locking pin 21 and the arrow pin 31 from rotating relative to the hole wall, making the swing arm limit device of the present invention more stable when locking the swing arm position.

[0047] Optionally, the limit plate 04 also includes a plurality of reinforcing ribs 43, which are connected between the connecting end and the limit end, and the plurality of reinforcing ribs 43 are arranged in sequence along the circumference of the connecting end. A plurality of limit key grooves 411 are provided on the hole wall of the connecting hole 41 of the limit plate 04 to enhance the connection strength between the rocker arm main shaft and the limit plate 04.

[0048] Optionally, the connection points of the automatic locking pin assembly 02, the arrow pin assembly 03 and the bracket 01 are located at different radial positions of the fan-shaped plate 42, and the first through hole and the second through hole are located at different radial positions of the fan-shaped plate 42, so that the limit pin holes of the arrow pin 31 and the automatic locking pin 21 do not interfere with each other and are independent of each other.

[0049] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A swing arm limiting device, characterized in that: The invention comprises a bracket (01), an automatic locking pin assembly (02), an arrow holding pin assembly (03), and a limit plate (04); the bracket (01) comprises a first plate body (11), the first plate body (11) is a flat plate, the first plate body (11) is horizontally arranged, the limit plate (04) comprises a connecting end and a limit end, the connecting end is provided with a connecting hole (41), the connecting hole (41) is used to connect a swing rod, the limit end is a fan-shaped plate (42), the fan-shaped plate (42) is provided with a pin hole (42 1), the automatic locking pin assembly (02) and the arrow-holding pin assembly (03) are both connected to the bracket (01), the automatic locking pin assembly (02) includes an automatic locking pin (21), the arrow-holding pin assembly (03) includes an arrow-holding pin (31), the automatic locking pin (21) and the arrow-holding pin (31) are both vertically arranged, the automatic locking pin (21) and the arrow-holding pin (31) are both suitable for moving up and down and locking in position when moving downward, and the first plate body (11) is provided with The automatic locking pin (21) and the arrow-holding pin (31) are provided with a first through hole and a second through hole, respectively corresponding to the automatic locking pin (21) and the arrow-holding pin (31). When the arrow-holding pin (31) moves downward, it passes through the second through hole and is blocked at the first edge of the sector plate (42) or extends into the pin hole (421). When the automatic locking pin (21) moves downward, it passes through the first through hole and is blocked at the second edge of the sector plate (42). When the arrow-holding pin (31) passes through the second through hole and is blocked at the sector plate (42), the arrow-holding pin (31) passes through the second through hole and is blocked at the sector plate (42). When the automatic locking pin (21) is at the first edge of the plate (42), the automatic locking pin (21) has not yet moved downward, and when the arrow-holding pin (31) moves downward, passes through the second through hole and extends into the pin hole (421), the automatic locking pin (21) moves downward until the bottom of the automatic locking pin (21) contacts the fan-shaped plate (42), and when the automatic locking pin (21) moves downward, passes through the first through hole and blocks the second edge of the fan-shaped plate (42), the arrow-holding pin (31) moves upward into position.

2. The swing rod limiting device according to claim 1, characterized in that: The arrow-holding pin assembly (03) further comprises an arrow-holding pin oil cylinder (32), an arrow-holding pin support (33), and an arrow-holding pin connecting frame (34); the arrow-holding pin support (33) is connected to the bracket (01); the arrow-holding pin oil cylinder (32) is connected to the arrow-holding pin support (33); one end of the arrow-holding pin connecting frame (34) is hinged to the piston rod of the arrow-holding pin oil cylinder (32), and the other end is hinged to the arrow-holding pin (31); when the piston rod of the arrow-holding pin oil cylinder (32) is extended, the arrow-holding pin (31) is driven to move downward, and the arrow-holding pin (31) passes through the second through hole.

3. The swing rod limiting device according to claim 2, characterized in that: The arrow-holding pin assembly (03) also includes an arrow-holding pin spring (35); the arrow-holding pin support (33) includes a support base plate (331); the arrow-holding pin (31) passes through the support base plate (331); the arrow-holding pin spring (35) is sleeved on the arrow-holding pin (31); and the arrow-holding pin spring (35) is located between the arrow-holding pin connecting frame (34) and the support base plate (331).

4. The swing rod limiting device according to claim 3, characterized in that: The arrow-holding pin (31) is provided with a first limiting boss (311), and when the arrow-holding pin (31) moves downward through the second through hole to block the first edge of the fan-shaped plate (42) or extends into the pin hole (421), the first limiting boss (311) abuts against the first plate body (11).

5. The swing rod limiting device according to claim 1, characterized in that: The automatic locking pin assembly (02) further comprises an automatic locking pin oil cylinder (22), an automatic locking pin support (23), an automatic locking pin connecting frame (24), and an automatic locking pin spring (25). The automatic locking pin support (23) is connected to the bracket (01). The automatic locking pin oil cylinder (22) is connected to the automatic locking pin support (23). The upper end of the automatic locking pin connecting frame (24) is hinged to the automatic locking pin oil cylinder (22). The automatic locking pin connecting frame (24) comprises lower end support ears. Both of the lower end support ears are provided with through holes extending in the length direction. The upper end of the automatic locking pin (21) is connected to a sliding pin (25). 11), both ends of the sliding pin (211) are respectively arranged in one of the through holes, the sliding pin (211) is suitable for moving up and down relative to the through hole, the automatic locking pin (21) is provided with a second limiting boss (212), the automatic locking pin spring (25) is sleeved on the automatic locking pin (21), the automatic locking pin spring (25) is located between the bottom plate of the automatic locking pin support (23) and the second limiting boss (212), when the automatic locking pin (21) moves downward through the first through hole and blocks at the second edge of the fan-shaped plate (42), the second limiting boss (212) abuts against the first plate body (11).

6. The swing rod limiting device according to claim 5, characterized in that: The automatic locking pin connection frame (24) further comprises an upper end support ear, and the automatic locking pin connection frame (24) is hingedly connected to the piston rod of the automatic locking pin oil cylinder (22) via the upper end support ear.

7. The swing rod limiting device according to claim 1, characterized in that: The bracket (01) also includes a second plate body (12), the second plate body (12) is a flat plate, the second plate body (12) is horizontally arranged, the second plate body (12) is connected to the first plate body (11), and the second plate body (12) is provided with a third through hole and a fourth through hole, the third through hole corresponds to the first through hole, and the fourth through hole corresponds to the second through hole, the fan-shaped plate (42) is clamped between the first plate body (11) and the second plate body (12), the arrow-holding pin (31) passes through the second through hole and the fourth through hole when moving downward and is blocked at the first edge of the fan-shaped plate (42) or passes through the second through hole, the pin hole (421), and the fourth through hole in sequence, and the automatic locking pin (21) passes through the first through hole and the third through hole when moving downward and is blocked at the second edge of the fan-shaped plate (42).

8. The swing rod limiting device according to claim 7, characterized in that: The first through hole, the second through hole, the third through hole, the fourth through hole, and the pin hole (421) on the limiting plate (04) are all square holes, and the bottom of the automatic locking pin (21) and the bottom of the arrow holding pin (31) are both square columns.

9. The swing rod limiting device according to claim 1, characterized in that: The limiting plate (04) further comprises a plurality of reinforcing ribs (43), wherein the reinforcing ribs (43) are connected between the connecting end and the limiting end, and the plurality of reinforcing ribs (43) are arranged in sequence along the circumference of the connecting end.

10. The swing rod limiting device according to claim 1, characterized in that: The first through hole and the second through hole are located at different radial positions of the sector plate (42).

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