A hand adjustment mechanism for a railway wagon parking brake cylinder

Abstract

The application provides a kind of railway freight car parking brake cylinder manual adjustment mechanism, including piston component, guide bracket component and the manual adjustment mechanism being arranged in both interiors, the guide bracket component is oriented to the movement of manual adjustment mechanism, the manual adjustment mechanism is coaxially arranged with piston component and guide bracket component and is connected and fixed with piston rod, the manual adjustment mechanism includes adjusting rod assembly, first locking mechanism and second locking mechanism, the front end of adjusting rod assembly extends out of guide bracket component, the rear end is in piston component, the second locking mechanism is sleeved on adjusting rod assembly outside and is connected with piston rod limit, the first locking mechanism is sleeved on the second locking mechanism outside, the second locking mechanism cooperates with adjusting rod assembly screw rod and controls adjusting rod assembly to move along axial direction, and the first locking mechanism is connected with the second locking mechanism in linkage mode.The application can conveniently solve the parking brake cylinder relief and braking problem under various working conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of railway freight car braking technology, and particularly relates to a railway freight car parking brake cylinder manual adjustment mechanism. BACKGROUND

[0002] The railway freight car braking system is generally composed of an air braking system and a hand braking system. The air braking is mainly used for train running braking (such as normal braking and emergency braking); the hand braking is mainly used for train or vehicle parking braking (such as long-time parking on a slope and in a station or section).

[0003] Due to inevitable leakage of the air braking, the air brake cylinder cannot maintain braking force for a long time. In order to prevent the train from running away under the action of external forces such as wind force and slope sliding force, the railway staff must operate the hand brake when the train is parked. However, the traditional manual hand brake has the problems of inconvenient operation, braking force depending on the strength of the operator, and the operator being prone to misoperation to cause poor vehicle relief, resulting in wheel skidding, tread abrasion and other safety hazards.

[0004] At present, the manual relief of the parking brake cylinder with automatic braking and automatic relief functions is mainly realized through a locking mechanism. When the train is in a windless state, if manual relief is needed, the locking mechanism is disconnected from the piston rod by pulling a pull ring.

[0005] For example, the Chinese patent with publication number CN110155115B discloses a brake parking cylinder manual relief mechanism and a railway vehicle brake parking cylinder device. The brake parking cylinder manual relief mechanism includes a mounting seat, a taper handle and a relief screw arranged in the mounting seat. One end of the taper handle extends out of the mounting seat, and the taper handle can move in the mounting seat along the axial direction of the taper handle. A plurality of pin holes are arranged on the peripheral wall of the mounting seat in a direction perpendicular to the axis of the taper handle, and a pin is arranged in each pin hole. One end of the pin is in abutting contact with the taper surface of the taper handle. A pin spring is sleeved on the pin. The relief screw is used to connect an external component. In the parking braking state, the taper handle is pulled, the relief screw transmits force to the external component, the locking mechanism of the external component is relieved, and the relieved state can be maintained. However, the prior art can only realize manual relief, but cannot realize manual braking. SUMMARY

[0006] The present application aims at the deficiencies of the prior art, and provides a railway freight car parking brake cylinder manual adjustment mechanism which has the functions of manual braking, manual relief and manual relief and air charging automatic reset, can conveniently solve the problems of parking brake cylinder relief and braking in various working conditions, and is simple to operate and time-saving and labor-saving.

[0007] To solve the above technical problems, the present application adopts the following technical scheme:

[0008] The application discloses a hand adjusting mechanism for a railway wagon parking brake cylinder, which comprises a piston assembly, a guide bracket assembly and a hand adjusting mechanism arranged in the piston assembly and the guide bracket assembly.

[0009] Further, the second locking mechanism comprises a second ratchet wheel, a second pawl and a second pawl bracket, the second ratchet wheel is arranged outside the adjusting rod assembly and a limiting ring is arranged at the front end of the second ratchet wheel, the second pawl bracket is arranged outside the second ratchet wheel, the second pawl bracket is connected with the piston rod through a first round pin, the second pawl is arranged in the second pawl bracket, the second locking mechanism further comprises a second elastic control member for controlling the second pawl, the first locking mechanism is arranged outside the front end of the second ratchet wheel and is connected with the first locking mechanism in linkage, a thrust ball bearing and an adjusting nut are sequentially arranged at the rear end of the second ratchet wheel in the axial direction, the adjusting nut rotates with the second ratchet wheel and cooperates with the screw rod of the adjusting rod assembly. The second ratchet wheel is rotated to drive the adjusting nut to rotate, thereby controlling the adjusting rod assembly to move in the axial direction, and the hand control of the parking brake cylinder is completed, the second pawl is controlled to be separated from the second ratchet wheel through the first elastic control member, the second ratchet wheel can be manually controlled to rotate clockwise through a special wrench, thereby driving the adjusting nut to control the adjusting rod assembly to move forward relative to the piston rod, the vehicle is relieved, the second pawl is released to keep the relief state, the second pawl bracket connects the hand adjusting mechanism with the piston rod and cooperates with the piston rod, and the position of the hand adjusting mechanism is limited, so that the hand adjusting mechanism and the piston assembly are prevented from rotating under the action of the spring force, the train can be manually relieved through the manual control of the second locking mechanism, the operation is simple, time and labor are saved.

[0010] Further, the second elastic control member comprises a second spring sleeved outside the second pawl and a handle extending upward from the second pawl support, two ends of the second spring are connected to the inner wall of the second pawl support and the bottom end of the second pawl respectively, and the handle is fixedly connected with the end of the second pawl. The handle can be easily controlled to lift the bottom end of the second pawl, the second spring is compressed by lifting the handle, so that the bottom end of the second pawl is separated from the ratchet teeth of the second ratchet wheel, the staff can drive the second ratchet wheel to rotate clockwise by using a special wrench, and the adjusting nut is rotated to make the adjusting rod assembly move radially, so that the manual relief operation is completed, which is simple in operation, time-saving and labor-saving. When the second spring is reset after the manual brake or the manual relief and the automatic reset, the second pawl is in contact with the ratchet teeth of the second ratchet wheel, and the second ratchet wheel and the second pawl can normally cooperate to rotate.

[0011] Further, the adjusting nut is provided with a lock ring, the adjusting nut is connected to the rear end of the second ratchet wheel through a second round pin penetrating the lock ring and the adjusting nut, and the second round pin is fixed by a split pin. The second round pin can drive the second ratchet wheel to rotate, and the lock ring is used to prevent the second round pin from separating from the adjusting nut.

[0012] Further, the front end of the second ratchet wheel is sequentially sleeved with a first support ring and a first sealing ring from outside to inside in the radial direction, the first sealing ring is sleeved with the adjusting rod assembly, and the front end of the first support ring is provided with a second check ring. The inside of the front end of the second ratchet wheel is open, used for arranging the first support ring and the first sealing ring, and the second check ring is arranged at the opening to prevent the first support ring from escaping from the second ratchet wheel.

[0013] Further, the rear end of the second pawl support comprises an integrally formed second support ring, and the second support ring is provided with a second sealing ring sleeved with the second ratchet wheel.

[0014] Further, the first locking mechanism comprises a first ratchet wheel and a first pawl support sequentially sleeved from inside to outside at the front end of the second ratchet wheel in the radial direction, the first ratchet wheel and the second ratchet wheel are connected by a hexagon, the first pawl support is provided with a first pawl matched with the first ratchet wheel, the first pawl support further comprises a first elastic control member for controlling the first pawl, the front end of the first pawl support is provided with a first check ring sleeved with the second ratchet wheel, and the first ratchet wheel and the second ratchet wheel are locked in the clockwise direction. The first locking mechanism and the second locking mechanism are connected in linkage by a hexagon, the first pawl can be controlled to press down the ratchet teeth of the first ratchet wheel by using the first elastic control member, so as to prevent the first ratchet wheel from rotating counterclockwise. At this time, the first ratchet wheel, the second ratchet wheel and the adjusting nut are driven to rotate counterclockwise by controlling the first pawl support to rotate counterclockwise by using a special tool, so as to make the adjusting rod assembly retract into the parking brake cylinder, brake the vehicle and keep the braking state, thereby realizing the manual brake function of the train, which is simple in operation, time-saving and labor-saving.

[0015] Further, the first elastic control member comprises a first spring sleeved outside the first pawl, two ends of the first spring are connected with the inner wall of the first pawl support and the bottom end of the first pawl respectively, and the first pawl support is further provided with a crowbar insertion hole. The crowbar is inserted into the crowbar insertion hole, the first pawl is pressed down by the first spring to contact the first ratchet, at this time, the first pawl prevents the first ratchet from rotating counterclockwise, when the first pawl support rotates counterclockwise, the first ratchet is driven to rotate counterclockwise together with the second ratchet through the hexagonal belt, the adjusting nut rotates together with the second ratchet, due to the limiting effect of the second pawl support, the second ratchet and the adjusting nut can only rotate relative to the piston rod and cannot move forward and backward, therefore, the counterclockwise rotation of the adjusting nut can drive the adjusting rod assembly to move backward relative to the piston rod, so that the adjusting rod assembly is retracted to generate braking force on the parking brake cylinder.

[0016] Further, the adjusting rod assembly comprises a pull rod, a connecting sleeve and a screw rod arranged in sequence from front to back, the rear end of the pull rod is welded with the connecting sleeve, the front end of the screw rod is screwed with the connecting sleeve, the second locking mechanism is sleeved outside the screw rod, the rear end of the screw rod extends into the piston rod, and the front end of the pull rod extends out of the guide support. The connecting sleeve plays a limiting role when the manual adjusting mechanism moves to the front end of the guide support, at this time, the position of the adjusting rod assembly remains unchanged, due to the continuous air charging state of the train, the piston rod continues to push forward, and the second pawl support limits the movement of the second ratchet, the adjusting nut, the first ratchet and the first pawl support, so that the second ratchet, the adjusting nut, the first ratchet and the first pawl support rotate while continuing to move forward, until the piston rod stops moving, at this time, the manual adjusting mechanism is reset, ready for the next air exhaust automatic braking, which can realize the function of manual relief and air charging automatic reset, saving time and effort.

[0017] Further, the guide support assembly comprises a limiting support, a guide plate and an end plate, the rear end of the limiting support is connected and fixed with the front end of the shell, the front end of the limiting support is detachably connected with the end plate, the guide plate is sleeved outside the connecting sleeve and the edge thereof is attached to the inner wall of the limiting support, the front end of the pull rod extends out of the end plate, the inner wall of the front end of the shell is provided with a limiting sleeve for limiting the piston rod, and the energy storage spring is sleeved outside the limiting sleeve. The end plate is provided with a small hole for the pull rod to extend out, the diameter of the small hole is smaller than the diameter of the front end of the connecting sleeve, so that the end plate can limit the movement of the connecting sleeve and the guide plate when the manual relief and air charging are performed, preventing the adjusting rod assembly from continuing to move axially, and the guide plate and the limiting sleeve make the movement of the piston rod and the manual adjusting mechanism more stable.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The parking brake cylinder has the functions of manual braking, manual relief and automatic reset after manual relief and air charging, and can conveniently solve the problems of parking brake cylinder relief and braking under various working conditions, and is simple to operate and saves time and effort. The first locking mechanism and the second locking mechanism can be controlled independently, one of the locking mechanisms is controlled independently, the other locking mechanism is driven to rotate in the same direction, thereby controlling the axial movement of the adjusting rod assembly matched with the second locking mechanism screw, when the locking mechanism rotates clockwise, the adjusting rod assembly extends to the front end, realizing manual relief of the train, when the locking mechanism rotates counterclockwise, the adjusting rod assembly is withdrawn to the rear end, realizing manual braking of the train, when the train is manually relieved and air charged, the piston rod moves to drive the connecting sleeve in the adjusting rod assembly to move to the front end position of the guide bracket, the adjusting rod assembly no longer moves, and the locking mechanism rotates and moves axially to the front end along with the continuous movement of the piston rod, realizing the function of automatic reset after air charging, which is simple to operate, saves time and effort, can solve the problems of parking brake cylinder relief and braking under various working conditions, can not only realize manual relief, but also easily realize manual braking and automatic reset after manual relief and air charging, overcomes the defect that air braking cannot maintain braking force for a long time due to leakage, and avoids safety hazards. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of manual braking of the present application.

[0021] Figure 2 It is a schematic diagram of manual relief of the present application.

[0022] Figure 3 It is a schematic diagram of manual relief and air charging reset of the present application.

[0023] Figure 4 It is a schematic diagram of the structure of the manual adjusting mechanism of the present application.

[0024] Figure 5 It is a sectional view of the structure of the manual adjusting mechanism of the present application.

[0025] Figure 6 It is a schematic diagram of the second ratchet structure of the present application.

[0026] Wherein, 1-thrust ball bearing, 2-second pawl support, 3-pull handle, 4-first pawl support, 5-screw rod, 6-adjusting nut, 7-first round pin, 8-second ratchet wheel, 9-first ratchet wheel, 10-connection sleeve, 11-pull rod, 12-second round pin, 13-second support ring, 14-second pawl, 15-second spring, 16-first pawl, 17-first spring, 18-first check ring, 19-first support ring, 20-split pin, 21-lock ring, 22-second sealing ring, 23-first sealing ring, 24-second check ring, 25-limiting check ring, 26-piston, 27-guiding support, 271-limiting support, 272-guiding plate, 28-energy storage spring, 29-prying stick insertion hole, 30-end plate, 31-hexagon. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] The present application will be further described below with reference to specific embodiments, but not as a limitation of the present application.

[0030] The hand adjustment mechanism of the railway wagon parking brake cylinder shown in the figure comprises a piston assembly 26, a guide bracket assembly 27 and a hand adjustment mechanism arranged inside the two, the piston assembly 26 comprises a shell, a piston rod and an energy storage spring 28 sleeved outside the piston rod, the guide bracket assembly 27 is arranged at the front end of the shell and plays a guiding role for the movement of the hand adjustment mechanism, the hand adjustment mechanism is coaxially arranged with the piston assembly 26 and the guide bracket assembly 27 and is fixedly connected with the piston rod, the hand adjustment mechanism comprises an adjustment rod assembly, a first locking mechanism and a second locking mechanism, the front end of the adjustment rod assembly extends out of the guide bracket assembly 27, the rear end is located in the piston assembly 26, the second locking mechanism is sleeved outside the adjustment rod assembly and is limitingly connected with the piston rod, the first locking mechanism is sleeved outside the second locking mechanism, the second locking mechanism cooperates with the screw rod of the adjustment rod assembly to control the axial movement of the adjustment rod assembly, the first locking mechanism and the second locking mechanism are connected in linkage and the locking directions of the two are the same. The first locking mechanism and the second locking mechanism can be controlled independently, by controlling one of the locking mechanisms independently, the other locking mechanism can be driven to rotate in the same direction, so as to control the axial movement of the adjustment rod assembly cooperating with the screw rod of the second locking mechanism, when the locking mechanism rotates clockwise, the adjustment rod assembly extends to the front end, realizing the manual relief of the train, when the locking mechanism rotates counterclockwise, the adjustment rod assembly is withdrawn to the rear end, realizing the manual braking of the train, when the train is manually relieved and then inflated, the piston rod moves to drive the connecting sleeve in the adjustment rod assembly to move to the front end position of the guide bracket assembly, the adjustment rod assembly no longer moves, and the locking mechanism rotates along the axial direction to move to the front end with the continuous movement of the piston rod, realizing the automatic reset function after inflation, which is simple to operate, time-saving and labor-saving, can solve the relief and braking problems of the parking brake cylinder under various working conditions, can not only realize manual relief, but also easily realize manual braking and automatic reset function after manual relief and inflation, overcomes the defect that air braking cannot maintain braking force for a long time due to leakage, and avoids safety hazards.

[0031] Preferably, the second locking mechanism includes a second ratchet 8, a second pawl 14, and a second pawl bracket 2. The second ratchet 8 is sleeved outside the adjusting rod assembly and has a limiting retaining ring 25 at its front end. The second pawl bracket 2 is sleeved outside the second ratchet 8 and is limitedly connected to the piston rod via a first round pin 7. The second pawl 14 is disposed inside the second pawl bracket 2. The second locking mechanism also includes a second elastic control element for controlling the second pawl 14. The first locking mechanism is sleeved outside the front end of the second ratchet 8 and is linked to it. A thrust ball bearing 1 and an adjusting nut 6 are sequentially sleeved along the axial direction at the rear end of the second ratchet 8. The adjusting nut 6 rotates with the second ratchet 8 and engages with the lead screw of the adjusting rod assembly. The second ratchet rotates, driving the adjusting nut to rotate, which in turn controls the axial movement of the adjusting rod assembly, thus enabling manual control of the parking brake cylinder. The first elastic control element controls the second pawl to disengage from the second ratchet. A special wrench can be used to manually control the second ratchet to rotate clockwise, thereby driving the adjusting nut to move the adjusting rod assembly forward relative to the piston rod, releasing the vehicle. Lowering the second pawl maintains the released state. The second pawl bracket connects and cooperates with the manual adjustment mechanism and the piston rod, while also limiting the position of the manual adjustment mechanism to prevent the manual adjustment mechanism and piston assembly from rotating under the spring force. The train can be manually released by manually controlling the second locking mechanism to unlock it. The operation is simple, time-saving, and labor-saving.

[0032] Preferably, the second elastic control component includes a second spring 15 fitted over the second pawl 14 and a handle 3 extending upward from the second pawl bracket 2. The two ends of the second spring 15 are respectively connected to the inner wall of the second pawl bracket 2 and the bottom end of the second pawl 14. The handle 3 is fixed to the end of the second pawl 14 by rivets. The handle allows easy control of the bottom position of the second pawl. Lifting the handle compresses the second spring, disengaging the bottom of the second pawl from the ratchet teeth of the second ratchet. This allows the operator to manually release the ratchet by rotating the second ratchet clockwise with a special wrench, which in turn moves the adjusting rod assembly radially. This simple, time-saving, and labor-saving operation is achieved. When the manual braking or release is completed and the air is automatically reset, the second spring returns to its original position, causing the second pawl to contact the ratchet teeth of the second ratchet. The second ratchet and second pawl can then rotate counter-clockwise.

[0033] Preferably, the adjusting nut 6 is fitted with a locking ring 21. The adjusting nut 6 is connected to the rear end of the second ratchet 8 via a second pin 12 passing through the locking ring 21 and the adjusting nut 6. The second pin 12 is fixed by a cotter pin 20. The second pin can drive the second ratchet to rotate, and the locking ring is used to prevent the second pin from disengaging from the adjusting nut.

[0034] As preferred, the first end of the second ratchet wheel 8 is sequentially sleeved with the first support ring 19 and the first sealing ring 23 from outside to inside in the radial direction, the first sealing ring 23 is sleeved on the adjusting rod assembly, and the first support ring 19 is provided with the second stop ring 24 at the front end. The first end of the second ratchet wheel is provided with an opening inside for arranging the first support ring and the first sealing ring, and the second stop ring is arranged at the opening to prevent the first support ring from escaping from the second ratchet wheel.

[0035] As preferred, the second pawl support 2 is provided with the second support ring 13 integrally formed at the rear end, and the second support ring 13 is provided with the second sealing ring 22 sleeved on the second ratchet wheel 8. The first sealing ring and the second sealing ring play a role in dustproof and waterproof.

[0036] As preferred, the first locking mechanism includes the first ratchet wheel 9 and the first pawl support 4 sequentially sleeved from inside to outside in the radial direction at the front end of the second ratchet wheel 8, the first ratchet wheel 9 and the second ratchet wheel 8 are connected through the hexagon 31, the first pawl support 4 is provided with the first pawl 16 matched with the first ratchet wheel 9, the first pawl support 4 further includes the first elastic control member for controlling the first pawl 16, the first pawl support 4 is provided with the first stop ring 18 sleeved on the second ratchet wheel 8 at the front end, and the first ratchet wheel 9 and the second ratchet wheel 8 are locked when both rotate in the clockwise direction. The first locking mechanism and the second locking mechanism are connected in linkage through the hexagon, the first pawl can be controlled to press down the ratchet teeth of the first ratchet wheel by the first elastic control member to prevent the first ratchet wheel from rotating counterclockwise, at this time, the first ratchet wheel, the second ratchet wheel and the adjusting nut can be driven to rotate counterclockwise by controlling the first pawl support to rotate counterclockwise with a special tool, so that the adjusting rod assembly is retracted into the parking brake cylinder, the vehicle is braked and kept in the braking state, and the manual braking function of the train is realized. The operation is simple, time-saving and labor-saving.

[0037] As preferred, the first elastic control member includes the first spring 17 sleeved outside the first pawl 16, both ends of the first spring 17 are connected with the inner wall of the first pawl support 4 and the bottom end of the first pawl 16 respectively, and the first pawl support 4 is further provided with the crowbar insertion hole 29. The first pawl is pressed down by the first spring by inserting the crowbar into the crowbar insertion hole, so that the first pawl is in contact with the first ratchet wheel, at this time, the first pawl prevents the first ratchet wheel from rotating counterclockwise, and the two are locked. At this time, the first ratchet wheel is driven to rotate counterclockwise when the first pawl support is rotated counterclockwise, and the second ratchet wheel is driven to rotate counterclockwise through the hexagon, the adjusting nut rotates together with the second ratchet wheel, and the second ratchet wheel and the adjusting nut can only rotate relative to the piston rod due to the limiting action of the second pawl support, and cannot move forward and backward. Therefore, the counterclockwise rotation of the adjusting nut can make the adjusting rod assembly move backward relative to the piston rod, so that it is retracted into the parking brake cylinder to generate braking.

[0038] As preferred, the adjusting rod assembly comprises the pull rod 11, the connecting sleeve 10 and the screw rod 5 arranged in sequence from front to back, the rear end of the pull rod 11 is welded with the connecting sleeve 10, the front end of the screw rod 5 is threadedly connected with the connecting sleeve 10, the second locking mechanism is sleeved outside the screw rod 5, the rear end of the screw rod 5 extends into the piston rod, and the front end of the pull rod 11 extends out of the guide bracket assembly 27. The connecting sleeve plays a limiting role when the manual adjusting mechanism moves to the front end of the guide bracket assembly, at this time, the position of the adjusting rod assembly remains unchanged, since the train is in a continuous air charging state, the piston rod continues to push forward, and the limiting role of the second pawl bracket is added, so that the second ratchet wheel, the adjusting nut, the first ratchet wheel and the first pawl bracket rotate and continue to move forward, until the piston rod stops moving, at this time, the manual adjusting mechanism resets, ready for the next automatic exhaust brake, and the function of manual relief and automatic reset after air charging can be realized, time and labor are saved.

[0039] As preferred, the guide bracket assembly 27 comprises the limiting bracket 271, the guide plate 272 and the end plate 30, the rear end of the limiting bracket 271 is connected and fixed with the front end of the shell, the front end of the limiting bracket 271 is detachably connected with the end plate 30, the guide plate 272 is sleeved outside the connecting sleeve 10 and the edge thereof is attached to the inner wall of the limiting bracket 271, the front end of the pull rod 11 extends out of the end plate 30, the inner wall of the front end of the shell is provided with a limiting sleeve for limiting the piston rod, and the energy storage spring 28 is sleeved outside the limiting sleeve. The end plate is provided with a small hole for the pull rod to extend out, the diameter of the small hole is smaller than the diameter of the front end of the connecting sleeve, so that the end plate can limit the connecting sleeve and the guide plate when the manual relief and air charging are performed, the movement of the adjusting rod assembly in the axial direction is prevented, and the movement of the piston rod and the manual adjusting mechanism is more stable.

[0040] The second pawl bracket is connected with the piston rod and the guide bracket assembly in the piston assembly through the first round pin, the relative position of the manual adjusting mechanism and the piston rod can be ensured, and the manual adjusting mechanism and the piston assembly can be prevented from rotating under the action of the spring force; the second ratchet wheel is connected with the adjusting nut through the second round pin, when the vehicle is in a braking state, the second ratchet wheel can be rotated clockwise, the adjusting nut is driven to rotate through the second round pin, the screw rod extends out of the parking brake cylinder, the vehicle is relieved and kept in a relieved state; the first ratchet wheel is connected with the second ratchet wheel through a hexagonal, when the vehicle is in a relieved state, the first ratchet wheel can be rotated counterclockwise, the second ratchet wheel is also rotated counterclockwise, the adjusting nut is driven to rotate through the second round pin, the screw rod is retracted into the parking brake cylinder, and the vehicle is braked and kept in a braking state; the manual adjusting mechanism is automatically reset without manual reset after manual relief, when the parking brake cylinder is charged with air, the manual adjusting mechanism can be automatically reset, ready for the next automatic braking. The parking brake cylinder has the functions of manual braking, manual relief and automatic reset after manual relief, the problems of the parking brake cylinder in various working conditions can be conveniently solved, the operation is simple, and time and labor are saved.

[0041] Manual relief working condition: the vehicle is parked for a long time, due to leakage, the parking brake cylinder piston assembly is retracted under the elastic force of the energy storage spring, driving the manual adjustment mechanism to retract together to generate braking effect, such as Figure 1 . When manually relieving, lift the handle, lift the second pawl through the rivet, make the second pawl and the second ratchet wheel disengage, rotate the second ratchet wheel clockwise with a special wrench, under the action of the second round pin, the adjusting nut rotates together with the second ratchet wheel, due to the limiting action of the second pawl bracket, the second ratchet wheel and the adjusting nut can only rotate relative to the piston rod and cannot move forward and backward, so the clockwise rotation of the adjusting nut can make the screw rod move forward relative to the piston rod, make the screw rod extend out of the parking brake cylinder, and the vehicle is relieved, at this time, the second pawl is released, the relieved state can be maintained, such as Figure 2 .

[0042] Manual braking working condition: when manually braking, insert the crowbar into the crowbar insertion hole of the first pawl bracket and rotate the first pawl bracket counterclockwise, since the first pawl is pressed between the ratchet teeth of the first ratchet wheel under the action of the first spring, the counterclockwise rotation of the first pawl bracket drives the first ratchet wheel and the second ratchet wheel to rotate counterclockwise together through the hexagonal belt, such as Figure 6 , under the action of the second round pin, the adjusting nut rotates together with the second ratchet wheel, due to the limiting action of the second pawl bracket, the second ratchet wheel and the adjusting nut can only rotate relative to the piston rod and cannot move forward and backward, so the counterclockwise rotation of the adjusting nut can make the screw rod move backward relative to the piston rod, make the screw rod retract into the parking brake cylinder to generate braking, such as Figure 1 .

[0043] Manual relief and air charging reset working condition: after manual relief, air is charged to the parking brake cylinder, the parking brake cylinder piston assembly moves forward under the action of the air pressure, drives the manual adjustment mechanism to move forward together under the action of the first round pin. When the connecting sleeve contacts the end plate, the screw rod, the connecting sleeve and the pull rod cannot continue to move forward due to the blockage of the end plate, so the second pawl bracket drives the second ratchet wheel, the adjusting nut, the first ratchet wheel, the first pawl bracket to rotate and continue to move forward, until the piston rod stops moving, at this time, the manual adjustment mechanism is reset, ready for the next air exhaust automatic braking, such as Figure 3 .

[0044] The above is only the preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A hand adjustment mechanism for a railway freight car parking brake cylinder, characterized by: The device comprises a piston assembly (26), a guide bracket assembly (27) and a manual adjustment mechanism arranged inside the two assemblies, the piston assembly (26) comprises a housing, a piston rod and an energy storage spring (28) sleeved outside the piston rod, the guide bracket assembly (27) is arranged at the front end of the housing and guides the movement of the manual adjustment mechanism, the manual adjustment mechanism is coaxially arranged with the piston assembly (26) and the guide bracket assembly (27) and is fixedly connected with the piston rod, the manual adjustment mechanism comprises an adjusting rod assembly, a first locking mechanism and a second locking mechanism, the front end of the adjusting rod assembly extends out of the guide bracket assembly (27), the rear end of the adjusting rod assembly is arranged in the piston assembly (26), the second locking mechanism is sleeved outside the adjusting rod assembly and is limitingly connected with the piston rod, the first locking mechanism is sleeved outside the second locking mechanism, the second locking mechanism cooperates with the screw rod of the adjusting rod assembly to control the axial movement of the adjusting rod assembly, and the first locking mechanism is connected with the second locking mechanism in linkage and the locking directions of the two locking mechanisms are the same. The second locking mechanism comprises a second ratchet wheel (8), a second pawl (14) and a second pawl bracket (2), the second ratchet wheel (8) is sleeved outside the adjusting rod assembly and the front end of the second ratchet wheel (8) is provided with a limiting stop ring (25), the second pawl bracket (2) is sleeved outside the second ratchet wheel (8), the second pawl bracket (2) is limitingly connected with the piston rod through a first round pin (7), the second pawl (14) is arranged in the second pawl bracket (2), the second locking mechanism further comprises a second elastic control member for controlling the second pawl (14), the first locking mechanism is sleeved outside the front end of the second ratchet wheel (8) and is connected with the second ratchet wheel (8) in linkage, the rear end of the second ratchet wheel (8) is sequentially sleeved with a thrust ball bearing (1) and an adjusting nut (6) along the axial direction, the adjusting nut (6) rotates with the second ratchet wheel (8) and cooperates with the screw rod of the adjusting rod assembly.

2. The railway freight car parking brake cylinder manual adjustment mechanism of claim 1, characterized by: The second elastic control member comprises a second spring (15) sleeved outside the second pawl (14) and a handle (3) extending out of the second pawl bracket (2), the two ends of the second spring (15) are respectively connected with the inner wall of the second pawl bracket (2) and the bottom end of the second pawl (14), and the handle (3) is fixedly connected with the end portion of the second pawl (14).

3. The railway freight car parking brake cylinder manual adjustment mechanism of claim 1 wherein: The adjusting nut (6) is sleeved with a lock ring (21), the adjusting nut (6) is connected with the rear end of the second ratchet wheel (8) through a second round pin (12) penetrating through the lock ring (21) and the adjusting nut (6), and the second round pin (12) is fixed through a split pin (20).

4. The railway freight car parking brake cylinder manual adjustment mechanism of claim 1, wherein: The front end of the second ratchet wheel (8) is sequentially sleeved with a first support ring (19) and a first sealing ring (23) from outside to inside along the radial direction, the first sealing ring (23) is sleeved with the adjusting rod assembly, and the front end of the first support ring (19) is provided with a second stop ring (24).

5. The railway freight car parking brake cylinder manual adjustment mechanism of claim 1, wherein: The rear end of the second pawl bracket (2) comprises an integrally formed second support ring (13), and the second support ring (13) is provided with a second sealing ring (22) sleeved with the second ratchet wheel (8).

6. The railway freight car parking brake cylinder manual adjustment mechanism of claim 1, wherein: The first locking mechanism comprises a first ratchet wheel (9) and a first pawl support (4) which are sequentially sleeved in the radial direction from inside to outside near the front end of the second ratchet wheel (8), the first ratchet wheel (9) and the second ratchet wheel (8) are connected through a hexagon (31), the first pawl support (4) is provided with a first pawl (16) matched with the first ratchet wheel (9) inside, the first pawl support (4) further comprises a first elastic control member for controlling the first pawl (16), the first pawl support (4) is provided with a first blocking ring (18) sleeved on the second ratchet wheel (8) at the front end, and the first ratchet wheel (9) and the second ratchet wheel (8) are locked in the clockwise direction.

7. The railway freight car parking brake cylinder manual adjustment mechanism of claim 6, characterized by: The first elastic control member comprises a first spring (17) sleeved outside the first pawl (16), both ends of the first spring (17) are connected with the inner wall of the first pawl support (4) and the bottom end of the first pawl (16) respectively, and the first pawl support (4) is further provided with a crowbar insertion hole (29).

8. The railway freight car parking brake cylinder manual adjustment mechanism according to any one of claims 1-7, characterized in that: The adjusting rod assembly comprises a pull rod (11), a connecting sleeve (10) and a screw rod (5) which are sequentially arranged from front to back, the rear end of the pull rod (11) is welded with the connecting sleeve (10), the front end of the screw rod (5) is threadedly connected with the connecting sleeve (10), the second locking mechanism is sleeved outside the screw rod (5), the rear end of the screw rod (5) extends into the piston rod, and the front end of the pull rod (11) extends out of the guide support assembly (27).

9. The railway freight car parking brake cylinder manual adjustment mechanism of claim 8, characterized by: The guide support assembly (27) comprises a limiting support (271), a guide plate (272) and an end plate (30), the rear end of the limiting support (271) is fixedly connected with the front end of the shell, the front end of the limiting support (271) is detachably connected with the end plate (30), the guide plate (272) is sleeved outside the connecting sleeve (10) and the edge thereof is attached to the inner wall of the limiting support (271), the front end of the pull rod (11) extends out of the end plate (30), the inner wall of the front end of the shell is provided with a limiting sleeve for limiting the piston rod, and the energy storage spring (28) is sleeved outside the limiting sleeve.

Images