WO2020034456A1

WO2020034456A1 - Braking force holding apparatus for railway freight car

Info

Publication number: WO2020034456A1
Application number: PCT/CN2018/114715
Authority: WO
Inventors: 刘毅; 吕超; 王开恩; 安鸿; 肖维远; 全琼; 申燕飞; 韦雪丽; 申检宏; 杜霞; 李果; 肖晨; 胡玉梅; 毛富英; 时云霄; 吕亮
Original assignee: 眉山中车制动科技股份有限公司
Priority date: 2018-08-13
Filing date: 2018-11-09
Publication date: 2020-02-20
Also published as: CN109050502B; CN109050502A

Abstract

A braking force holding apparatus for a railway freight car, relating to the field of braking devices. The braking force holding apparatus comprises a cylinder base (10), a piston component (50), a cylinder body (20), a front cover (30), a release spring (60), and a locking mechanism (40); the cylinder base (10) is connected with the cylinder body (20) and the front cover (30) so as to form a sealed cavity (80); an opening (11) is provided on the cylinder base (10); the opening (11) is communicated with the cavity (80); the piston component (50), the release spring (60), and the locking mechanism (40) are mounted in the cavity (80); the piston component (50) is slidably connected with the cylinder body (20); the locking mechanism (40) is configured to fix the piston component (50); the two ends of the release spring (60) are respectively connected with the piston component (50) and the locking mechanism (40); the release spring (60) is configured to make the piston component (50) and the locking mechanism (40) have the tendency of being far away from each other. The braking force holding apparatus for the railway freight car can fix the position of the piston component by using the locking mechanism, thereby holding a braking force, saving the action that people needs to continuously operate, and greatly reducing the labor intensity.

Description

Braking force holding device of railway freight car

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on August 13, 2018 under the application number 201810919528.7 and entitled "A Railway Freight Car Brake Holding Device", the entire contents of which are incorporated herein by reference. .

Technical field

The present application relates to the field of braking equipment, and in particular, to a braking force maintaining device for railway freight cars.

Background technique

A railway truck vehicle braking system is usually equipped with a set of brake cylinders and a set of hand brakes. The brake cylinders complete service braking (common braking, emergency braking). Hand brakes are usually used in the following situations: Use when parking; if the vehicle needs to stay on the ramp for a long time during the operation, in order to prevent the brake cylinder from leaking, the hand brake must be tightened at this time; the parking on the ramp to prevent slipping accidents , You need to tighten the hand brake. To prevent the vehicle from being blown away by the strong wind, tighten the hand brake. Tightening the hand brake needs to be operated one by one, especially when the vehicle is running, and dozens or hundreds of cars are parked on the ramp. To complete the hand brake operation, the labor intensity is extremely great.

Summary of the Invention

The object of the present application is to provide a braking force maintaining device for a railway freight car, so as to improve the problem that the existing vehicle is too labor-intensive when braking.

This application is implemented as follows:

Based on the above purpose, the present application provides a braking force maintaining device for a railway freight car, which includes a cylinder block, a piston assembly, a cylinder block, a front cover, a relief spring, and a locking mechanism. The front cover is connected to form a sealed cavity. An opening is provided on the cylinder seat, and the opening communicates with the cavity. The piston assembly, the relief spring, and the locking mechanism are installed in the cavity. The piston assembly is slidably connected to the cylinder, the locking mechanism is configured to fix the piston assembly, and both ends of the relief spring are connected to the piston assembly and the locking mechanism, respectively. The relief spring is configured to tend to move the piston assembly and the locking mechanism away from each other.

In an implementation manner of this embodiment, the piston assembly includes a piston and a piston rod, and the piston is slidably connected to the cylinder body. The piston rod is provided with an inner hole and a push rod head seat. A rod head seat is located in the inner hole, the push rod head seat is fixedly connected to the piston, the relief spring is sleeved on the piston rod, and one end of the relief spring is connected to the piston.

In an implementation manner of this embodiment, the piston assembly further includes a piston seal ring, the piston includes a mounting portion and a snap-in portion, and the snap-in portion is disposed around a circumferential direction of the mount portion, and the card The connecting portion is provided with a sealing groove, the sealing groove is ring-shaped around the axis line of the engaging portion, the piston seal ring is engaged in the sealing groove, and the piston rod is connected to the mounting portion.

In an implementation manner of this embodiment, an end of the latching portion remote from the mounting portion is disposed substantially perpendicular to an axial line of the mounting portion; an end of the latching portion remote from the mounting portion is installed A guide belt is wound around the engaging portion.

In an implementation manner of this embodiment, a cup lock ring is further provided on the latching portion, and the cup lock ring is configured to fix the piston seal ring.

In an implementation manner of this embodiment: the inner hole extends along the axis line direction of the piston rod, and the diameter of the inner hole gradually decreases along the axis line direction of the piston rod; the The putter head seat is located at the larger diameter end of the inner hole; the diameter of the putter head seat is larger than the minimum diameter of the inner hole; both ends of the inner hole respectively extend to both ends of the piston rod .

In an implementation manner of this embodiment: a push rod is provided on the piston rod, the push rod is inserted into the piston rod from a smaller diameter end of the inner hole, and the push rod is located on the piston rod One end in the inner hole is connected to the push rod head base; the length of the push rod is greater than the length of the piston rod.

In an implementation manner of this embodiment, a plurality of grooves are provided on the piston rod, and the plurality of grooves are disposed at intervals along the axial line direction of the piston rod, and the grooves surround the piston rod. The axis line is annular, and the side wall of the groove near the putter head is provided with an inclined surface, and the inclined surface is configured to gradually reduce the width of the groove along its recessed direction. In an implementation manner of this embodiment, the locking mechanism includes an energy storage spring, an energy storage spring seat, a parking piston, a ratchet assembly, and an elastic sleeve. The energy storage spring seat is mounted on the front cover, and A parking piston is slidably connected to the front cover, the energy storage spring is installed between the energy storage spring seat and the parking piston, and the energy storage spring is configured to make the energy storage spring seat and the parking piston There is a tendency to be relatively far away, the ratchet assembly is connected to the parking piston, and the ratchet assembly is configured to move with the parking piston, the elastic sleeve is connected to the energy storage spring seat, and the elastic sleeve is sleeved In the piston rod, one end of the elastic sleeve is provided with a plurality of tapered surfaces, and the plurality of tapered surfaces are arranged around the axis of the elastic sleeve, and the ratchet assembly is configured to shrink a plurality of the tapered surfaces. Alternatively, the plurality of tapered surfaces are configured to fix the piston assembly under a shrinking condition, and the other end of the relief spring is connected to the energy storage spring seat.

In an implementation manner of this embodiment: the locking mechanism further includes an intake pipe seat, the front cover includes a first section and a second section, the first section forms a mounting hole, and the parking piston The axis of the mounting hole slides relative to the front cover, the second section is located at the end of the first section, and the second section extends inward along the radial direction of the first section, The energy storage spring seat is installed in the first section; the parking piston includes a horizontal plate and a vertical plate, the horizontal plate is connected to the ratchet assembly, and the energy storage spring abuts the vertical plate, so An end of the vertical plate far from the horizontal plate abuts the first section, and a seal ring is installed between the vertical plate and the first section, and an end of the second section far from the first section The sealing ring is also arranged between the horizontal plate and the second section, and a cavity is formed between the parking piston and the front cover. The output end is in communication with the chamber.

In an implementation manner of this embodiment, the locking mechanism further includes a retaining ring, an outer ring of the retaining ring is engaged with the front cover, and an inner ring of the retaining ring is engaged with the front cover. An elastic sleeve, and the energy storage spring seat is located between the retaining ring and the energy storage spring.

In an implementation manner of this embodiment, the ratchet assembly includes a ratchet, a return spring, a spring sleeve, and a wedge. The ratchet is provided with a first protrusion and a through hole, and the first protrusion is located in the through Inside the hole, and the first protrusion is ring-shaped around the axis line of the through hole, a plurality of card slots are arranged on the ratchet wheel, and the plurality of card slots are spaced around the axis line of the through hole It is provided that one end of the card slot extends to an end surface of the ratchet wheel, and the card slot is located at an end of the ratchet wheel away from the spring sleeve, and the front cover is engaged with the card slot; The two ends are respectively connected to the ratchet wheel and the spring sleeve, and the return spring is configured to make the spring sleeve move toward the first projection, and the inclined wedge and the spring sleeve are respectively located in the spring On both sides of the first projection, the inclined wedge is coaxially arranged with the ratchet wheel, and the inner diameter of the inclined wedge gradually increases in a direction away from the first projection, and the spring sleeve is sleeved on the elasticity. Sleeve, the inclined wedge sleeve is provided on the elastic sleeve, and the inclined wedge is provided corresponding to the tapered surface.

In an implementation manner of this embodiment, the ratchet assembly further includes a spring seat and two retaining rings, both of the retaining rings are installed in the through hole, and both of the retaining ring and the through hole are Coaxially arranged, the two retaining rings are respectively located on both sides of the first protrusion, and the retaining ring is spaced from the first protrusion, the spring seat is annular, and the spring seat is located at Between the return spring and the retaining ring, one end of the return spring is in contact with the spring seat, the other end of the return spring is in contact with the spring sleeve, and the return spring is configured to make the A spring seat abuts against the retaining ring, and the two retaining rings respectively clamp the spring seat and the inclined wedge in the through hole.

In an implementation manner of this embodiment: the ratchet wheel is provided with a non-self-locking trapezoidal external thread, the parking piston is provided with an internal thread that cooperates with the non-self-locking trapezoidal external thread, and the parking piston Screwed to the ratchet.

In an implementation manner of this embodiment, the non-self-locking trapezoidal external thread and the internal thread are configured so that the ratchet wheel and the parking piston move toward each other under the condition that the ratchet wheel rotates in a forward direction, When the ratchet wheel rotates in the reverse direction, the ratchet wheel and the parking piston are far away from each other; the card slot includes two side walls, one of the side walls passes through the axis of the ratchet wheel, and the other The side wall is disposed obliquely, and is configured to gradually reduce the width of the card slot along its recessed direction. In the direction in which the ratchet wheel rotates forward, the front side of the card slot is disposed obliquely.

In an implementation manner of this embodiment, a clamping component is provided on the front cover, and the clamping component includes a pawl seat, a pawl, an elastic member, and a pull ring, and the pawl seat is mounted on the pawl seat. A front cover, the pawl is slidably connected to the pawl seat, the pawl slides relative to the pawl seat in a radial direction of the front cover, and one end of the pawl is snapped into the card slot The elastic member is installed between the pawl seat and the pawl, the elastic member is configured to make the pawl have a tendency to move toward the card slot, and the pull ring is installed on the ratchet The other end of the claw.

In an implementation manner of this embodiment, a second protrusion is provided on the spring sleeve, the second protrusion is located at one end of the spring sleeve, and the second protrusion is along a diameter of the spring sleeve. Projecting outward, one end of the spring sleeve provided with the second projection is disposed toward the first projection, the return spring is disposed on the spring cover, and one end of the return spring is in contact with The other end of the retaining ring and the return spring abuts against the second bump.

In an implementation manner of this embodiment, one end of the elastic sleeve is provided with a plurality of tapered surfaces, and the plurality of tapered surfaces are disposed at intervals around the axis of the elastic sleeve, and the ends of each of the tapered surfaces A first protrusion is provided, and the first protrusion is disposed toward the axis line of the elastic sleeve; the first protrusion extends along the axis line direction of the elastic sleeve, and the elastic sleeve is far from The tapered surface extends in the direction.

In an implementation manner of the embodiment, a clamping groove is provided on an inner wall of the elastic sleeve, the clamping groove is recessed outward in a radial direction of the elastic sleeve, and the clamping groove is along the elasticity. The shaft centerline of the sleeve extends, and both ends of the engaging groove respectively extend to two end surfaces of the elastic sleeve.

In an implementation manner of this embodiment, a mounting ring is provided at the other end of the elastic sleeve, and the diameter of the mounting ring is smaller than the diameter of the elastic sleeve. The mounting ring is provided with a thread, and the elastic sleeve The mounting ring is screwed to the energy storage spring seat, and an end of the spring sleeve remote from the first protruding block is locked between the energy storage spring seat and the elastic sleeve.

Compared with the prior art, the beneficial effects achieved by this application include:

When the railway freight car is braking, the piston assembly will retreat under the action of the easing spring after the braking action is released. When the piston assembly is returned to the original position, the braking force disappears. A locking mechanism can be used to fix the position of the piston assembly, thereby maintaining the braking force, eliminating the need for people to continue to operate, thereby greatly saving labor intensity.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the specific implementation of the present application or the technical solution in the prior art, the following will briefly introduce the practical drawings required in the specific implementation or the prior art description. Obviously, the drawings described below These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor.

FIG. 1 shows a schematic diagram of a braking force holding device for a railway freight car in a braking state according to an embodiment of the present application;

FIG. 2 shows a schematic diagram of a railway truck braking force maintaining device provided in an embodiment of the present application when the braking force is maintained;

FIG. 3 is a schematic diagram of a connection between a cylinder seat and a cylinder block provided by an embodiment of the present application; FIG.

4 is a schematic diagram of a piston assembly according to an embodiment of the present application;

FIG. 5 shows a schematic diagram of a piston according to an embodiment of the present application;

FIG. 6 shows a partial schematic diagram of a piston according to an embodiment of the present application; FIG.

FIG. 7 is a schematic diagram of a piston rod according to an embodiment of the present application; FIG.

FIG. 8 shows a partial schematic diagram of a piston rod according to an embodiment of the present application; FIG.

FIG. 9 shows a schematic diagram of a locking mechanism provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a front cover provided in an embodiment of the present application; FIG.

FIG. 11 is a schematic diagram of a parking piston provided by an embodiment of the present application; FIG.

FIG. 12 is a schematic diagram of a clamping component according to an embodiment of the present application; FIG.

FIG. 13 is a schematic diagram of a ratchet assembly according to an embodiment of the present application; FIG.

FIG. 14 is a schematic diagram of a ratchet wheel provided by an embodiment of the present application; FIG.

FIG. 15 is a schematic diagram of a spring sleeve according to an embodiment of the present application; FIG.

FIG. 16 is a schematic diagram of an elastic sleeve provided in an embodiment of the present application in a first perspective; FIG.

FIG. 17 is a schematic diagram of an elastic sleeve provided in an embodiment of the present application in a second perspective.

Reference signs: 10-cylinder block; 11-opening;

20-cylinder block;

30-front cover; 31-first paragraph; 32-second paragraph;

40-locking mechanism; 41-intake pipe seat; 42-parking piston; 421-vertical plate; 422-transverse plate; 43-energy storage spring seat; 44-energy storage spring; 45-chamber; 46-elastic sleeve; 461-slot groove; 462-mounting ring; 463-conical surface; 47-ratchet assembly; 471-ratchet; 4711-first projection; 4712-slot; 472-return spring; 473-retaining ring; 474-spring Sleeve; 4741 second projection; -475- spring seat; 476- oblique wedge; 477- thrust bearing;

50-piston assembly; 51-piston; 511-mounting part; 512-clamping part; 513-piston seal ring; 514-cup bowl lock ring; 515- guide belt; 52-piston rod; 521- putter head seat; 522-putter; 523-inner hole; 524-groove; 525-slope;

60-relief spring;

70-clamping assembly; 71- pawl seat; 72- pawl; 73- elastic piece; 74- pull ring;

80-cavity.

detailed description

The following further describes the present application in detail through specific implementation examples in conjunction with the accompanying drawings.

In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described above with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of the present application, but not all the embodiments. The components of embodiments of the present application, which are generally described and illustrated in the drawings herein, may be arranged and designed in a variety of different configurations.

Therefore, the above detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of this application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and are not indicative or implied. The device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application.

In this application, the terms "installation," "connected," "connected," and "fixed" shall be broadly understood unless otherwise specified and defined, for example, they may be fixed connections or integrated; they may be The mechanical connection can also be an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In this application, unless explicitly stated and defined otherwise, the first feature may include direct contact between the first and second features above or below the second feature, and may also include that the first and second features are not in direct contact but It is through another characteristic contact between them. Moreover, the first feature is above, above, and above the second feature, including the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is higher in level than the second feature. The first feature is below, below, and below the second feature, including the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is less horizontal than the second feature.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

1 to 17, this embodiment provides a braking force retaining device for a railway freight car, which includes a cylinder seat 10, a piston assembly 50, a cylinder block 20, a front cover 30, a relief spring 60, and a locking mechanism 40.

Specifically, referring to FIGS. 1 to 3, the cylinder block 10 is connected to the cylinder block 20 and the front cover 30 to form a sealed cavity 80, and the piston assembly 50, the relief spring 60 and the locking mechanism 40 are installed in the cavity 80. The cylinder block 10 is provided with an opening 11 that communicates with the cavity 80. The piston assembly 50 is slidably connected to the cylinder block 20. The piston assembly 50 is configured to slide back and forth in the cavity 80. The locking mechanism 40 is configured to fix the piston assembly. 50. Both ends of the relief spring 60 are connected to the piston assembly 50 and the locking mechanism 40, respectively. The relief spring 60 is configured so that the piston assembly 50 and the locking mechanism 40 have a tendency to move away from each other.

Preferably, referring to FIGS. 4 to 8, the piston assembly 50 includes a piston 51, a piston seal 513, and a piston rod 52. The piston 51 is slidably connected to the cylinder 10. The piston 51 includes a mounting portion 511 and a locking portion 512. 512 is provided around the mounting portion 511 in a circumferential direction, and a sealing groove is provided on the engaging portion 512. The sealing groove is ring-shaped around the axis of the engaging portion 512. The piston sealing ring 513 is engaged in the sealing groove. 511 is connected. An end of the latching portion 512 away from the mounting portion 511 is substantially perpendicular to an axial line of the mounting portion 511. A guiding tape 515 is mounted on one end of the engaging portion 512 away from the mounting portion 511, and the guiding tape 515 is wound around the engaging portion 512. A cup lock ring 514 is also provided on the locking portion 512, and the cup lock ring 514 is configured to fix the piston seal ring 513.

Preferably, referring to FIG. 7, the piston rod 52 is provided with an inner hole 523 and a putter head seat 521, the putter head seat 521 is located in the inner hole 523, and the putter head seat 521 is fixedly connected to the mounting portion 511 of the piston 51, for example, The push rod head 521 is welded to the mounting portion 511 of the piston 51, the relief spring 60 is sleeved on the piston rod 52, and one end of the relief spring 60 is connected to the piston 51. The inner hole 523 extends along the axis line direction of the piston rod 52, and the diameter of the inner hole 523 gradually decreases along the axis line direction of the piston rod 52. The putter head seat 521 is located at the larger diameter end of the inner hole 523. The diameter of the putter head 521 is larger than the minimum diameter of the inner hole 523. Both ends of the inner hole 523 extend to both ends of the piston rod 52, respectively. The piston rod 52 is provided with a push rod 522. The push rod 522 is inserted into the piston rod 52 from a smaller diameter end of the inner hole 523, and an end of the push rod 522 located in the inner hole 523 is connected to the push rod head 521. The length of the push rod 522 is greater than the length of the piston rod 52.

Preferably, referring to FIGS. 7 and 8, the piston rod 52 is provided with a plurality of grooves 524. The plurality of grooves 524 are disposed at intervals along the axis line direction of the piston rod 52. The grooves 524 surround the axis line of the piston rod 52. Has a ring shape. An inclined surface 525 is provided on a side wall of the groove 524 near the putter head 521, and the inclined surface 525 is configured to gradually reduce the width of the groove 524 along its recessed direction. The minimum width of the trenches 524 is greater than the distance between two adjacent trenches 524. The area of the groove 524 is less than half the length of the piston rod 52.

Preferably, referring to FIG. 9, the locking mechanism 40 includes a front cover 30, an intake pipe seat 41, an energy storage spring 44, an energy storage spring seat 43, a parking piston 42, a ratchet assembly 47 and an elastic sleeve 46, and the energy storage spring seat 43 is installed. At the front cover 30, the parking piston 42 is slidably connected to the front cover 30. An energy storage spring 44 is installed between the energy storage spring seat 43 and the parking piston 42. The energy storage spring 44 is configured so that the energy storage spring seat 43 and the parking piston 42 have Relatively far away, a cavity 45 is formed between the parking piston 42 and the front cover 30, the output end of the intake pipe seat 41 communicates with the cavity 45, the ratchet assembly 47 is connected to the parking piston 42, and the ratchet assembly 47 is configured to be parked with the parking The piston 42 moves together, and the elastic sleeve 46 is connected to the energy storage spring seat 43. The elastic sleeve 46 is sleeved on the piston rod 52. In conjunction with FIG. 16 and FIG. 17, one end of the elastic sleeve 46 is provided with a plurality of tapered surfaces 463 and a plurality of tapered surfaces. 463 is arranged around the axis of the elastic sleeve 46, and the ratchet assembly 47 is configured to shrink or expand a plurality of tapered surfaces 463. In conjunction with FIG. 7 and FIG. In 524, the piston assembly 50 is fixed, and the other end of the relief spring 60 is connected to the energy storage spring seat 43.

Preferably, referring to FIGS. 10 and 11, the front cover 30 includes a first section 31 and a second section 32. The first section 31 forms a mounting hole, and the parking piston 42 slides relative to the front cover 30 along the axis of the mounting hole. The second section 32 is located at the end of the first section 31, and the second section 32 extends inward along the radial direction of the first section 31. The parking piston 42 includes a horizontal plate 422 and a vertical plate 421. In conjunction with FIG. 9, the horizontal plate 422 and The ratchet assembly 47 is connected, the energy storage spring 44 abuts on the vertical plate 421, an end of the vertical plate 421 far from the horizontal plate 422 abuts on the first section 31, and a seal ring is installed between the vertical plate 421 and the first section 31. An end of the second section 32 away from the first section 31 is in contact with the horizontal plate 422, and a seal ring is also provided between the horizontal plate 422 and the second section 32.

Preferably, referring to FIG. 1 and FIG. 12, the front cover 30 is provided with a clamping assembly 70. The clamping assembly 70 includes a pawl seat 71, a pawl 72, an elastic member and a pull ring 74. The pawl seat 71 is mounted on the front cover 30. The pawl 72 is slidably connected to the pawl base 71. The pawl 72 slides relative to the pawl base 71 in the radial direction of the front cover 30. One end of the pawl 72 is snapped into the slot 4712, and the elastic member is installed on the pawl base 71. Between the pawl 72 and the pawl 72, the elastic member is configured to make the pawl 72 have a tendency to move toward the latching groove 4712, and the pull ring 74 is installed at the other end of the pawl 72.

Preferably, referring to FIG. 1, FIG. 9, and FIG. 13, the locking mechanism 40 further includes a retaining ring 473. The outer ring of the retaining ring 473 is engaged with the front cover 30. The inner ring of the retaining ring 473 is engaged with the elastic sleeve 46. The energy spring seat 43 is located between the retaining ring 473 and the energy storage spring 44.

Preferably, referring to FIGS. 13 and 14, the ratchet assembly 47 includes a ratchet 471, a return spring 472, a spring sleeve 474, a spring seat 475, a wedge 476, and two retaining rings 473. The ratchet 471 is provided with a first protrusion 4711 and a through Hole, the first protrusion 4711 is located in the through hole, and the first protrusion 4711 is ring-shaped around the axis of the through hole. Both retaining rings 473 are installed in the through hole, and both retaining rings 473 are the same as the through hole. The two retaining rings 473 are located on both sides of the first protrusion 4711, and the retaining ring 473 is spaced from the first protrusion 4711. The spring seat 475 is annular, and the spring seat 475 is located on the return spring 472 and the retaining ring 473. In between, one end of the return spring 472 is in contact with the spring seat 475, and the other end of the return spring 472 is in contact with the spring sleeve 474. The return spring 472 is configured so that the spring seat 475 is in contact with the retaining ring 473, and the return spring 472 is configured so that The spring sleeve 474 has a tendency to move toward the first protrusion 4711. The inclined wedge 476 and the spring sleeve 474 are located on both sides of the first protrusion 4711, respectively. The inclined wedge 476 and the ratchet 471 are coaxially arranged, and the inner diameter of the inclined wedge 476 is away from The direction of the first protrusion 4711 is gradually increased, the spring sleeve 474 is sleeved on the elastic sleeve 46, and the inclined wedge 476 sleeve The elastic sleeve 46 is provided, and the inclined wedge 476 is provided corresponding to the tapered surface 463. The two retaining rings 473 respectively catch the spring seat 475 and the inclined wedge 476 in the through hole.

The first bump 4711 divides the through hole into two parts, and the through hole is configured such that the length of one end of the mounting spring sleeve 474 is greater than or equal to the length of the other end.

The inclined wedge 476 is rotatably connected to the ratchet 471, and the inclined wedge 476 rotates relative to the ratchet 471 along its axis. The ratchet assembly 47 further includes two thrust bearings 477, which are respectively installed at both ends of the inclined wedge 476, and the inclined wedge 476 is connected to the ratchet 471 through the thrust bearing 477.

Preferably, referring to FIG. 15, the spring sleeve 474 is provided with a second projection 4741. The second projection 4741 is located at one end of the spring sleeve 474. The second projection 4741 protrudes outward from the spring sleeve 474 in the radial direction of the spring sleeve 474. An end of the spring sleeve 474 provided with the second protrusion 4741 is disposed toward the first protrusion 4711, a return spring 472 is sleeved on the spring cover 474, one end of the return spring 472 abuts against the retaining ring 473, and the other end of the return spring 472 abuts Connected to the second bump 4741. Before assembly, the second protrusion 4741 abuts on the first protrusion 4711 under the action of the return spring 472.

The length of the spring sleeve 474 is greater than the distance between the first protrusion 4711 and the retaining ring 473. The outer diameter of the spring seat 475 is substantially equal to the inner diameter of the ratchet 471, and the inner diameter of the spring seat 475 is substantially equal to the outer diameter of the spring sleeve 474. The outer diameter of the second projection 4741 is smaller than the inner diameter of the ratchet 471, and the outer diameter of the second projection 4741 is larger than the inner diameter of the first projection 4711. The inner diameter of one end of the spring sleeve 474 near the second protrusion 4741 is larger than the inner diameter of the other end of the spring sleeve 474. The return spring 472 is a spring in a compressed state.

Preferably, referring to FIG. 14, the ratchet wheel 471 is provided with a plurality of latching slots 4712. The plurality of latching slots 4712 are arranged at intervals around the axis of the through hole. One end of the latching slot 4712 extends to the end surface of the ratchet 471, and the latching slot 4712. It is located at the end of the ratchet 471 away from the spring sleeve 474. With reference to FIGS. 3 and 13, the front cover 30 is latched to the slot 4712; two ends of the return spring 472 are respectively connected to the ratchet 471 and the spring sleeve 474. The slot 4712 includes two side walls. One side wall passes through the axis line of the ratchet wheel 471, and the other side wall is disposed obliquely. The width of the slot 4712 is gradually reduced along the recessed direction. In this way, when something is caught in the slot 4712, the ratchet wheel 471 can only rotate in one direction.

Preferably, a non-self-locking trapezoidal external thread is provided on the outer peripheral surface of the other end of the ratchet wheel 471. The center line of the external thread is substantially parallel to the direction of the relative movement between the spring sleeve 474 and the ratchet wheel 471. The self-locking trapezoidal external thread is matched with an internal thread, and the parking piston 42 is screwed to the ratchet 471. The non-self-locking trapezoidal external and internal threads are configured such that the ratchet 471 and the parking piston 42 move toward each other under the condition that the ratchet 471 rotates in the forward direction, and the ratchet 471 and the parking piston 42 are away from each other under the condition that the ratchet 471 is rotated in the reverse direction. ; The slot 4712 includes two side walls, one side wall passes through the axis line of the ratchet 471, and the other side is disposed obliquely, so that the width of the slot 4712 gradually decreases along its recessed direction, and rotates in the positive direction of the ratchet 471 In the direction, the front side wall of the slot 4712 is inclined. In this embodiment, the clockwise direction viewed from right to left in the figure is positive, and the counterclockwise direction viewed from right to left in the figure is reverse.

Preferably, referring to FIG. 16 and FIG. 17, one end of the elastic sleeve 46 is provided with a plurality of tapered surfaces 463. The plurality of tapered surfaces 463 are spaced apart from each other around the axis of the elastic sleeve 46. A first protrusion is provided at the end of the tapered surface 463, and the first protrusion is provided toward the axis of the elastic sleeve 46. The first protrusion extends in the direction of the axis of the elastic sleeve 46, and the elastic sleeve 46 extends in a direction away from the tapered surface 463.

The inner wall of the elastic sleeve 46 is provided with a latching groove 461. The latching groove 461 is recessed outward in the radial direction of the elastic sleeve 46. The latching groove 461 extends along the axis of the elastic sleeve 46 and two ends of the latching groove 461. It extends to both end surfaces of the elastic sleeve 46, respectively. The plurality of latching grooves 461 are provided. The plurality of latching grooves 461 are arranged at intervals around the axis of the elastic sleeve 46. The number of the engaging slots 461 is six.

Preferably, referring to FIG. 17, in combination with FIGS. 9 and 14, the other end of the elastic sleeve 46 is provided with a mounting ring 462, the diameter of the mounting ring 462 is smaller than the diameter of the elastic sleeve 46, and the mounting ring 462 is provided with threads. The elastic sleeve 46 is screwed to the energy storage spring seat 43 through a mounting ring 462, and an end of the spring sleeve 474 away from the first protrusion 4711 is latched between the energy storage spring seat 43 and the elastic sleeve 46. The mounting ring 462 is provided with a plurality of second protrusions. The plurality of second protrusions are arranged at intervals around the axis of the mounting ring 462. The second protrusions protrude outward along the radial direction of the mounting ring 462. A notch is provided on the mounting ring 462, and the notch is ring-shaped around the axis of the mounting ring 462, and the notch is recessed inward along the radial direction of the mounting ring 462. The notch is spaced from the second protrusion, and the notch is located between the second protrusion and the elastic sleeve 46.

The structure and installation method of the railway vehicle braking force holding device provided in this embodiment are as follows:

The plunger head seat 521 in the piston assembly 50 is inserted from the large end of the inner hole 523 of the piston rod 52, but cannot be pushed out from the small end. The piston rod 52 is welded to the piston 51. A guide belt 515 is installed on the outer circle of the piston 51, a seal ring is installed in the groove 524 of the piston 51, and a cup lock ring 514 locks the seal ring to the piston 51. In particular, there is an annular groove 524 on the outer circumference of the piston rod 52. The elastic sleeve 46 in the locking mechanism 40 blocks the protrusion when the braking force is maintained, preventing the piston rod 52 from backing up and achieving locking.

The piston rod 52 may not be a bump, but a bare rod. The piston rod 52 can also be held immobile by increasing the frictional force (increasing the force of the energy storage spring) to play a parking role.

The locking mechanism 40 is connected to the cylinder base 10 through six bolts. The intake pipe holder 41 is welded to the front cover 30, and the pressurized air of the train tube enters the right side of the parking piston 42 through the small hole of the intake pipe holder 41, which is an operation signal of the locking mechanism 40. A sealing ring is installed at the front cover 30, and together with the sealing ring on the parking piston 42, completes the sealing of the right-side cavity 45 of the parking piston 42. This cavity 45 is called a parking cylinder cavity 45.

The energy storage spring seat 43 is screw-connected to the front cover 30, presses the energy storage spring on the left side of the parking piston 42, and a retaining ring 473 is installed at the front cover 30 to prevent the energy storage spring seat 43 from rotating out. The limit sleeve is put on the parking piston 42 to limit the compression amount of the energy storage spring.

The inner circle of the parking piston 42 is a non-self-locking trapezoidal thread, and meshes with the thread of the ratchet 471 in the ratchet assembly 47.

In the ratchet assembly 47, the restoration spring sleeve 474 is blocked by the spring sleeve 474 during installation, and the restoration spring is pressed against the ratchet 471 before assembly, and the return spring 472 seat is blocked by the retaining ring 473. The oblique wedge 476 is installed on the right side of the ratchet wheel 471. Thrust bearings 477 are respectively installed on both sides of the oblique wedge 476, and they are blocked by a retaining ring 473 with a hole.

The inner surface of the oblique wedge 476 cooperates with the tapered surface 463 of the elastic sleeve 46. The oblique wedge 476 will be subjected to the axial force into a radial force and amplified. The magnification is determined by the cone angle of the oblique wedge 476. This radial force promotes the elastic sleeve 46. Collapse radially.

The outer circle of the ratchet 471 is a non-self-locking trapezoidal thread that meshes with the thread of the parking piston 42. It has teeth on the outer end of the other end and faces the direction of the ratchet 471. The ratchet 471 can rotate counterclockwise. However, due to the blocking of the pawl 72 clockwise, it cannot rotate.

The elastic sleeve 46 is threadedly connected to the energy storage spring seat 43 through the ratchet assembly 4737, and the elastic sleeve 466 is clamped by a special tool 47 to rotate 4712, and the retaining ring 473 prevents the elastic sleeve 46 from rotating out. The elastic sleeve 46 annularly supports the piston rod 52 to prevent the piston rod 52 from heading up. The elastic sleeve 46 convexly catches the piston rod 52 during parking (braking force holding), forming a parking brake (braking force holding). The elastic sleeve 46 is petal-shaped, and the tapered surface 463 will gather radially after receiving the radial force.

The elastic sleeve 46 can also increase the protrusion. By increasing the force of the energy storage spring, the clamping force between the elastic sleeve 46 and the optical piston rod 52 is increased, which serves to prevent the piston rod 52 from retreating and achieve the function of parking. .

The braking method of the railway truck braking force holding device is that the compressed air enters the left side of the piston assembly 50 and pushes the piston 51 to the braking direction (to the right). The braking force pushes the push rod 522 through the push rod head seat 521, and the push rod 522 pushes the base braking device to generate braking force.

The working principle of the railway truck braking force holding device in this embodiment is:

(1) Inflated unlocked state:

During the running of the train, the compressed air of the train tube is charged into the right side of the parking piston 42 through the intake pipe seat 41, and the energy storage spring 44 is compressed until the limit sleeve is stopped. The parking piston 42 no longer moves to the left, and the ratchet 471 is resetting. The spring 472 moves to the left, which drives the wedge 476 to the left until the ratchet 471 contacts the energy storage spring seat 43 and the locking mechanism 40 is in an unlocked state. At this time, the piston rod 52 can move.

(2) Exhaust locked state:

When the train brakes, the air pressure of the train tube decreases, and the pressure on the right side of the parking piston 42 connected to it decreases. When the force of the pressure air on the parking piston 42 is insufficient to balance the force of the storage spring, the storage spring Push the parking piston 42 to move to the right, and the parking piston 42 pushes the ratchet 471 to the right through thread engagement. Because the engagement thread is non-self-locking, the ratchet 471 will tend to rotate forward, but the groove 4712 on the outer periphery of the ratchet 471 is ratcheted. Restricted by the claw 72, it cannot rotate in the forward direction, and the ratchet 471 can only move to the right with the parking piston 42 at this time. During the movement of the ratchet 471 to the right, the pushing bearing and the pushing wedge 476 move to the right. The inner surface of the wedge 476 fits with the tapered surface 463 of the elastic sleeve 46. Under the action of the energy storage spring 44, the diameter of the elastic sleeve 46 Close up, jam the piston rod 52, and abut the groove 524 of the piston rod 52, and the piston rod 52 cannot be retracted. Even if the pressure air on the left side of the piston 51 is completely leaked, the piston rod 52 can be maintained in the braking position by the energy storage spring.

When the train is relieved, the air pressure in the chamber 45 rises, pushing the parking piston 42 to the left until the stopper is blocked, and the ratchet 471 drives the wedge 476 to retreat to complete the unlocking of the locking mechanism 40.

(2) Manual unlock status:

The locking mechanism 40 can be manually unlocked in addition to being unlocked by inflation. When no pressure air is charged into the parking cylinder chamber 45 (right side of the parking piston 42) and it needs to be unlocked, the pull ring 74 is pulled, and the pawl 72 leaves the locking groove 4712 of the ratchet 471. The ratchet 471 is forwarded by the return spring 472. Rotating and moving to the left causes the wedge 476 to move to the left, the axial force of the tapered surface 463 of the elastic sleeve 46 disappears, the elastic sleeve 46 recovers, the elastic sleeve 46 disengages the piston rod 52, and the piston rod 52 reduces the effect of the spring 60 Back down until the piston 51 contacts the cylinder block 10. In this process, the parking piston 42 is moved to the right until it contacts the front cover 30, and the locking mechanism 40 is unlocked.

In summary, the braking force retaining device for railway freight cars provided by this application uses the pressure drop of the train tube as a signal after the vehicle has braked, and through a set of locking mechanisms, the piston in the cylinder cannot be returned, and the braking force has Hold, even if the pressure air leakage in the cylinder is zero, the braking force is always maintained, and the braking force is maintained automatically. When relief is needed, the intake pipe seat is inflated, the locking mechanism is unlocked, the holding force disappears, and the brake cylinder is relieved. When the train tube cannot be inflated, the locking mechanism can be unlocked by releasing the pull ring to realize the relief of the brake cylinder.

In addition, most of the brake cylinder pistons of the existing railway truck vehicles are cast iron pistons, which are heavy and labor-intensive. Especially when the brake cylinders are repaired in each depot, the work space is narrow, More labor-intensive. The piston in the present application can be stamped with a 7mm steel plate, and the weight of the piston assembly can be reduced by 42% compared to the original cast iron piston (305 × 254 type brake cylinder).

The above is only a preferred embodiment of the present application, and is not configured to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of this application shall be included in the protection scope of this application.

Industrial applicability

When the railway freight car is braking, the piston assembly will retreat under the action of the easing spring after the braking action is released. When the piston assembly is returned to the original position, the braking force disappears. The braking force retaining device for the railway freight car provided by this application The locking mechanism can be used to fix the position of the piston assembly, thereby maintaining the braking force, eliminating the need for people to continue the operation, thereby greatly saving labor intensity and having industrial applicability.

Claims

A braking force maintaining device for a railway freight car, comprising a cylinder seat, a piston assembly, a cylinder block, a front cover, a easing spring, and a locking mechanism. The cylinder seat is connected to the cylinder block and the front cover to form one. The sealed cavity is provided with an opening on the cylinder seat, the opening is in communication with the cavity, and the piston assembly, the relief spring, and the locking mechanism are installed in the cavity, and the piston The component is slidingly connected to the cylinder, the locking mechanism is configured to fix the piston component, and both ends of the relief spring are respectively connected to the piston component and the locking mechanism, and the relief spring is configured to make The piston assembly and the locking mechanism have a tendency to move away from each other.
The braking force maintaining device for a railway freight car according to claim 1, wherein the piston assembly includes a piston and a piston rod, the piston is slidably connected to the cylinder body, and the piston rod is provided with an inner hole and a pusher. A rod head seat, the putter head seat is located in the inner hole, the putter head seat is fixedly connected to the piston, the relief spring is sleeved on the piston rod, and one end of the relief spring and The piston is connected.
The braking force maintaining device for a railway freight car according to claim 2, wherein the piston assembly further comprises a piston seal ring,

The piston includes a mounting portion and a clamping portion. The clamping portion is provided around a circumferential direction of the mounting portion. A sealing groove is provided on the clamping portion, and the sealing groove surrounds an axis of the clamping portion. The wire is ring-shaped, the piston seal ring is snapped into the seal groove, and the piston rod is connected to the mounting portion.
The braking force maintaining device for a railway freight car according to claim 3, wherein

An end of the snap-in portion remote from the mounting portion is disposed substantially perpendicular to an axis line of the mounting portion;

A guiding tape is mounted on an end of the locking portion remote from the mounting portion, and the guiding tape is wound around the locking portion.
The braking force retaining device for a railway freight car according to claim 3 or 4, wherein:

A cup lock ring is further provided on the snap-in portion, and the cup lock ring is configured to fix the piston seal ring.
The braking force retaining device for a railway freight car according to any one of claims 2 to 5, wherein

The inner hole extends along the axis line direction of the piston rod, and the diameter of the inner hole gradually decreases along the axis line direction of the piston rod;

The putter head is located at the larger diameter end of the inner hole; the diameter of the putter head is larger than the minimum diameter of the inner hole; both ends of the inner hole extend to the piston rod respectively. Both ends.
The braking force maintaining device for a railway freight car according to claim 6, wherein:

A push rod is provided on the piston rod,

The push rod is inserted into the piston rod from a smaller diameter end of the inner hole, and an end of the push rod located in the inner hole is connected to the push rod head seat;

The length of the push rod is greater than the length of the piston rod.
The braking force maintaining device for a railway freight car according to any one of claims 2 to 7, wherein the piston rod is provided with a plurality of grooves, and the plurality of grooves are along the axis of the piston rod The grooves are arranged at intervals in the line direction, and the grooves have a ring shape around the axis of the piston rod. A side surface of the groove on the side close to the putter head seat is provided with an inclined surface. The width gradually decreases along the direction of its depression.
The braking force maintaining device for a railway freight car according to any one of claims 2 to 8, wherein the locking mechanism comprises an energy storage spring, an energy storage spring seat, a parking piston, a ratchet assembly and an elastic sleeve,

The energy storage spring seat is installed on the front cover, the parking piston is slidably connected to the front cover, the energy storage spring is installed between the energy storage spring seat and the parking piston, and the energy storage The spring is configured to make the energy storage spring seat and the parking piston relatively distant, the ratchet assembly is connected to the parking piston, and the ratchet assembly is configured to move with the parking piston, the elasticity The sleeve is connected to the energy storage spring seat,

The elastic sleeve is sleeved on the piston rod. One end of the elastic sleeve is provided with a plurality of tapered surfaces. The plurality of tapered surfaces are arranged around the axis of the elastic sleeve. The ratchet assembly is configured to make a plurality of The tapered surface is contracted or expanded, a plurality of the tapered surfaces are configured to fix the piston assembly under a shrinking condition, and the other end of the relief spring is connected to the energy storage spring seat.
The braking force maintaining device for a railway freight car according to claim 9, wherein the locking mechanism further comprises an intake pipe seat,

The front cover includes a first section and a second section, the first section forms a mounting hole, the parking piston slides relative to the front cover along the axis of the mounting hole, and the second section is located at An end of the first section, and the second section extends inward along a radial direction of the first section, and the energy storage spring seat is installed in the first section;

The parking piston includes a horizontal plate and a vertical plate, the horizontal plate is connected to the ratchet assembly, the energy storage spring abuts against the vertical plate, and an end of the vertical plate away from the horizontal plate abuts on the vertical plate. The first segment is described, and a seal ring is installed between the vertical plate and the first segment. An end of the second segment remote from the first segment abuts against the horizontal plate, and the horizontal plate and the The second ring is also provided with the seal ring, a cavity is formed between the parking piston and the front cover, and the output end of the intake pipe seat is in communication with the cavity.
The braking force maintaining device for a railway freight car according to claim 9 or 10, wherein the locking mechanism further comprises a retaining ring, and an outer ring of the retaining ring is engaged with the front cover, and the retaining ring The inner ring of the ring is clamped to the elastic sleeve, and the energy storage spring seat is located between the retaining ring and the energy storage spring.
The braking force maintaining device for a railway freight car according to any one of claims 9 to 11, wherein the ratchet assembly includes a ratchet, a return spring, a spring sleeve, and a wedge, and the ratchet is provided with a first projection and A through hole, the first protrusion is located in the through hole, and the first protrusion is ring-shaped around an axis line of the through hole; The card slot is arranged at intervals around the axis of the through hole, one end of the card slot extends to an end surface of the ratchet wheel, and the card slot is located at an end of the ratchet wheel away from the spring sleeve, and the front cover Snapped to the card slot; both ends of the return spring are respectively connected to the ratchet and the spring sleeve, and the return spring is configured to make the spring sleeve move toward the first projection, The inclined wedge and the spring sleeve are respectively located on both sides of the first projection, the inclined wedge is coaxially disposed with the ratchet, and an inner diameter of the inclined wedge is in a direction away from the first projection. Gradually increasing, the spring sleeve is sleeved on the elastic sleeve, and the oblique wedge sleeve is sleeved on the elastic sleeve An elastic sleeve, and the inclined wedge is provided corresponding to the tapered surface.
The braking force retaining device for a railway freight car according to claim 12, wherein the ratchet assembly further comprises a spring seat and two retaining rings,

The two retaining rings are installed in the through hole, the two retaining rings are arranged coaxially with the through hole, the two retaining rings are respectively located on both sides of the first bump, and the retaining ring The spring seat is spaced apart from the first bump, and the spring seat is in a ring shape, and the spring seat is located between the return spring and the retaining ring. One end of the return spring abuts the spring seat. The other end of the return spring is in contact with the spring sleeve. The return spring is configured to contact the spring seat with the retaining ring. The two retaining rings respectively connect the spring seat and the inclined wedge. Stuck in the through hole.
The braking force maintaining device for a railway freight car according to claim 12 or 13, wherein the ratchet wheel is provided with a non-self-locking trapezoidal external thread, and the parking piston is provided with a phase corresponding to the non-self-locking trapezoidal external thread. With the matching internal thread, the parking piston is screwed to the ratchet.
The braking force maintaining device for a railway freight car according to claim 14, wherein the non-self-locking trapezoidal external thread and the internal thread are configured so that the ratchet wheel and the ratchet wheel are in a forward rotation condition. When the parking piston moves towards each other, and the ratchet wheel rotates in the reverse direction, the ratchet wheel and the parking piston move away from each other; the card slot includes two side walls, and one side wall passes through the shaft of the ratchet wheel. A center line, and the other side wall is disposed obliquely, and is configured to gradually reduce the width of the card slot along its recessed direction. In the direction in which the ratchet wheel rotates forward, the side of the card slot is forward The wall is set obliquely.
The braking force maintaining device for a railway freight car according to any one of claims 12 to 15, wherein the front cover is provided with a clamping component, wherein the clamping component includes a pawl seat, a pawl, and an elastic member. And a pull ring, the pawl seat is mounted on the front cover, the pawl is slidably connected to the pawl seat, and the pawl slides relative to the pawl seat in a radial direction of the front cover, One end of the pawl is snapped into the card slot, the elastic member is installed between the pawl seat and the pawl, and the elastic member is configured so that the pawl has a direction toward the card slot In a trend of movement, the pull ring is mounted on the other end of the pawl.
The braking force holding device for a railway freight car according to any one of claims 12 to 16, wherein

A second projection is provided on the spring sleeve, the second projection is located at one end of the spring sleeve, the second projection protrudes outward in a radial direction of the spring sleeve, and the spring sleeve is provided One end of the second protruding block is disposed toward the first protruding block, the return spring is sleeved on the spring sleeve, one end of the return spring is in contact with the retaining ring, and the other of the return spring is One end abuts against the second bump.
The braking force maintaining device for a railway freight car according to any one of claims 9 to 17, wherein

A plurality of tapered surfaces are provided at one end of the elastic sleeve, and the plurality of tapered surfaces are spaced around the axis of the elastic sleeve. A first protrusion is provided at the end of each of the tapered surfaces. The protrusion is disposed toward the axis of the elastic sleeve;

The first protrusion extends in the direction of the axis of the elastic sleeve, and the elastic sleeve extends in a direction away from the tapered surface.
The braking force maintaining device for a railway freight car according to any one of claims 9 to 17, wherein

A snap groove is provided on an inner wall of the elastic sleeve, the clip groove is recessed outward in a radial direction of the elastic sleeve, the clip groove extends along an axis line of the elastic sleeve, and the card Both ends of the connecting slot respectively extend to two end faces of the elastic sleeve.
The braking force retaining device for a railway freight car according to any one of claims 9 to 17, wherein the other end of the elastic sleeve is provided with a mounting ring, and the diameter of the mounting ring is smaller than the diameter of the elastic sleeve, The mounting ring is provided with a thread, the elastic sleeve is screwed to the energy storage spring seat through the mounting ring, and an end of the spring sleeve remote from the first projection is locked to the energy storage spring seat. And the elastic sleeve.