CN215763281U

CN215763281U - Novel buffer seal for hydraulic breaking hammer

Info

Publication number: CN215763281U
Application number: CN202122190281.XU
Authority: CN
Inventors: 杜杰; 陈成
Original assignee: Yantai Runfuxiang Oil Seal Co ltd
Current assignee: Yantai Runfuxiang Oil Seal Co ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-02-08
Anticipated expiration: 2031-09-10

Abstract

The utility model relates to a novel buffer seal for a hydraulic breaking hammer, which relates to the technical field of sealing parts and comprises an elastic support ring, an adjusting ring, a support ring, a buffer ring and a check ring; the utility model discloses a buffer ring, including elastic support ring, buffer ring, adjustable ring, retaining ring, elastic support ring and support ring are coaxial and adjacent to be set up, elastic support ring, support ring establish with the coaxial cover of buffer ring respectively and are connected, adjustable ring and the coaxial setting of elastic support ring, and inlay mutually and connect in elastic support ring, the both sides of elastic support ring are put to retaining ring and support ring branch, just retaining ring and elastic support ring's terminal surface side laminating, the gap is left with the terminal surface side of buffer ring to the retaining ring. The novel buffer seal for the hydraulic breaking hammer has good buffer seal performance.

Description

Novel buffer seal for hydraulic breaking hammer

Technical Field

The utility model relates to the technical field of sealing elements, in particular to a novel buffer seal for a hydraulic breaking hammer.

Background

The hydraulic breaking hammer is called as breaking hammer or breaker for short, is installed in the bucket or bucket of excavator or loader for breaking stone and rock, and is the main equipment for open-pit mining.

The cushion seal is an important component of the seal in a hydraulic breaker. The interior of the middle cylinder body is hollow, the front end of the middle cylinder body is provided with a dustproof sealing groove, a main oil sealing groove and a buffering ring groove, and the dustproof sealing groove, the main oil sealing groove and the buffering ring groove are used for providing positions for sealing rings installed inside, so that oil in the middle cylinder body can be conveniently sealed. The mutual action of the piston and the valve group in the middle cylinder body enables the piston to reciprocate, so that the hydraulic breaking hammer can achieve striking operation.

The buffer seal is very important for the protection of the hydraulic equipment. The large hydraulic breaking hammer has large impact energy, high oil hydraulic pressure in the cylinder body, strong impact, high reciprocating frequency of the piston and high internal temperature. The existing buffer sealing structure is shown in figure 1 and cannot meet the use requirement. During operation, if the buffer seal can not reduce the impact of oil, the main seal at the front end can be directly impacted by the oil to cause failure. On the other hand, if the stable oil film can not be leaked from the buffer seal, the main seal at the front end and the piston generate dry friction to cause high-temperature failure, and oil leakage can be caused after the failure of the main seal to cause insufficient oil pressure in the cylinder body, so that the breaking hammer cannot normally work. The clearance of piston and well cylinder body is very little, and the holding power is not enough after the main seal inefficacy can cause piston and well cylinder body to pull the hirsute, and the iron that the in-process produced can enter into the cavity, influences the quartering hammer and normally works.

Specifically, the buffer seal used on the hydraulic breaking hammer at the present stage has the following problems: (1) the friction heat generation of the matrix is high, and the service life is short; (2) the buffer seal fails prematurely due to poor high hydraulic impact resistance of the structure; (3) the shape is enlarged after being impacted by pressure, and the leaked oil film is unstable; (4) limited by polyurethane base materials, the rebound speed is low, and the following performance is poor; (5) the high temperature compression set property is poor.

Based on this, it is necessary to design and develop a new buffer seal for a hydraulic breaking hammer.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects in the prior art, the utility model provides a novel buffer seal for a hydraulic breaking hammer.

The technical scheme is as follows: in order to achieve the purpose, the novel buffer seal for the hydraulic breaking hammer comprises an elastic support ring, an adjusting ring, a support ring and a buffer ring; the elastic support ring and the support ring are coaxial and adjacent to each other, the elastic support ring and the support ring are respectively connected with the buffer ring in a sleeved mode, the adjusting ring and the elastic support ring are coaxially arranged and are connected in the elastic support ring in an embedded mode.

The buffer ring is characterized by further comprising a check ring, the check ring and the support ring are respectively arranged on two sides of the elastic support ring, the check ring is attached to the end face side of the elastic support ring, and a gap is reserved between the check ring and the end face side of the buffer ring.

Furthermore, a convex lip is arranged on the outer circular surface of the elastic support ring;

furthermore, the axial symmetrical position of elastic support ring is provided with the fixed slot that is used for installing the adjustable ring, the adjustable ring can be rectangle circle, D type circle, O type circle or star type circle.

Furthermore, a circle of groove is formed in the joint side of the elastic support ring and the retainer ring, the groove divides the end face side of the elastic support ring into a part A and a part B, wherein the part A is far away from the axis, the part B is close to the axis, and the upper surface of the part A is higher than that of the part B.

Furthermore, a plurality of oil return grooves are formed in the side, close to the end face of the retainer ring, of the buffer ring, extend along the radial direction, and are distributed at intervals along the circumferential direction.

Further, the inner circle face of the buffer ring is provided with a first seal lip and an arc-shaped second seal lip, wherein the first seal lip is composed of an inclined face C and an inclined face D, the inclined face C faces the high-pressure oil side, the inclined face D deviates from the high-pressure oil side, the inclined face C is defined to form an included angle with the axial direction, the inclined face D is defined to form an included angle with the axial direction, the included angle with the axial direction is F, the E is larger than or equal to 40 degrees and smaller than or equal to 60 degrees, and the F is larger than or equal to 10 degrees and smaller than or equal to 20 degrees.

Furthermore, the check ring and the support ring are provided with inclined notches, and the check ring and the support ring respectively form a closed ring after the inclined notches are closed.

Furthermore, the inner ring surface of the retainer ring is wavy, and the distance between the wave crest and the wave trough is 0.2mm at most.

Furthermore, the elastic support ring is made of PPDI system polyurethane material, the adjusting ring is made of modified material with nitrile rubber as base material, the support ring is made of nylon material, the buffer ring is made of modified polytetrafluoroethylene material with the mass percentage of 20% -40%, and the check ring is made of nylon material.

The novel buffer seal for the hydraulic breaking hammer at least has the following technical effects:

(1) the check ring, the first lip of the buffer ring and the second lip of the buffer ring form triple buffering functions, and after buffering, the impact and pressure of oil are very low, so that the oil is protected for the subsequent sealing;

(2) the elastic support ring made of polyurethane material has high-strength support performance, can ensure the integrity of the elastic support ring under high hydraulic impact, provides good sealing for the outer side when the lip on the outer side of the elastic support ring impacts the groove with oil, and can protect the adjusting ring which is wrapped in the elastic support ring and made of nitrile rubber material from being impacted by high-pressure oil; the elastic support ring can provide larger holding force for the buffer ring, and the groove on the oil side can further provide holding force for buffering under the action of oil pressure impact, so that the first lip of the buffer ring can provide stable sealing under the condition of high-low pressure change;

(3) the problem of slow rebound of polyurethane can be solved by adopting the adjusting ring of the nitrile rubber, so that the follow-up property of the buffering ring is improved under the impact vibration of the high-frequency reciprocating motion of the piston;

(4) the support ring is used as a fulcrum to be matched with the second lip of the buffer ring, so that the gap between the second lip of the buffer ring and the piston is unchanged in a working state, and a stable oil film is provided for the main seal;

(5) the buffer ring adopting polytetrafluoroethylene is tightly embraced on the piston to play a sealing role, the self-lubricating property is good, the friction coefficient is low, the internal heat is less, the temperature of the buffer seal can be reduced, and the service life of the buffer seal is prolonged.

Drawings

FIG. 1 illustrates a buffer sealing manner of a conventional breaking hammer;

FIG. 2 is a schematic view of the installation of the cushion seal according to the present invention;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a top view of the retainer ring of the present invention;

FIG. 5 is an enlarged view of portion I of FIG. 4;

FIG. 6 is a schematic structural view of an elastic support ring according to the present invention;

FIG. 7 is a front view of the support ring of the present invention;

FIG. 8 is a schematic view of the buffer ring according to the present invention;

fig. 9 is a schematic cross-sectional view of a cushion ring according to the present invention.

In the figure, 1, an elastic support ring; 2. an adjusting ring; 3. a support ring; 4. a buffer ring; 5. a retainer ring; 6. fixing grooves; 7. a groove; 8. part A; 9. part B; 10. an oil return groove; 11. a bevel C; 12. a bevel D; 13. a first seal lip; 14. a second sealing lip; 15. and (4) chamfering.

Detailed Description

The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-8, which are provided by way of example only to illustrate the present invention and not to limit the scope of the present invention.

Example 1

The utility model provides a hydraulic pressure quartering hammer is sealed with novel buffering, includes elastic support ring 1, adjustable ring 2, support ring 3, cushion ring 4 and retaining ring 5.

The elastic support ring 1 and the support ring 3 are coaxial and adjacent to each other, the elastic support ring 1 and the support ring 3 are respectively connected with the buffer ring 4 in a sleeved mode, the adjusting ring 2 is coaxially arranged with the elastic support ring 1, and the adjusting ring is embedded into the elastic support ring 1. The retainer ring 5 and the support ring 3 are respectively arranged on two sides of the elastic support ring 1, the retainer ring 5 is attached to the end face side of the elastic support ring 1, and a gap is reserved between the retainer ring 5 and the end face side of the buffer ring 4.

This patent of installation the buffering when sealed, retaining ring 5 is the first subassembly of the sealed high oil pressure side of buffering, and its effect is tentatively reduced the oil pressure and strikes, plays the effect of elastomer in the protection subassembly, improves its life. The inner diameter of the retainer ring 5 is provided with raised grains with the depth of less than 0.2 mm. The wave patterns can prolong the impact-resistant service life of the retainer ring 5 and play a role in oil return. The elastic support ring 1 is arranged in the middle of the buffer seal, a circle of groove 7 is arranged on the joint side of the elastic support ring 1 and the retainer ring 5, the groove 7 divides the end face side of the elastic support ring 1 into a part A8 and a part B9, wherein the part A8 is far away from the axis, the part B9 is close to the axis, and the upper surface of the part A8 is higher than the upper surface of the part B9. The excircle face of elasticity support ring 1 is provided with convex lip, and this lip contacts with the cylinder body cell wall, and its effect is the protection internal regulation ring 2 and provides the holding power for buffer ring 4. The elastic support ring 1 is provided with fixing grooves 6 for mounting the adjusting ring 2 at axial symmetrical positions; the adjusting ring 2 can be a rectangular ring, a D-shaped ring, an O-shaped ring or a star-shaped ring. The sealing force and the following performance of the breaking hammer are adjusted according to different models and working conditions, so that the working conditions can be better adapted, and the following stability of the lip mouth is ensured. Adjusting ring 2 one side and cylinder body cell wall contact, other faces are wrapped up by elastic support ring 1, and the effect is guaranteed to press under the great condition to become and provide the support for cushion ring 4 at elastic support ring 1. The buffer ring 4 is in contact with the piston, a first sealing lip 13 and an arc-shaped second sealing lip 14 which are formed by an inclined surface C11 and an inclined surface D12 are arranged on the inner ring surface of the buffer ring, wherein the inclined surface C11 faces the high-pressure oil side, the inclined surface D12 deviates from the high-pressure right side, the included angle between the inclined surface C11 and the axial direction is defined as E, the included angle between the inclined surface D12 and the axial direction is defined as F, the E is more than or equal to 40 degrees and less than or equal to 60 degrees, and the F is more than or equal to 10 degrees and less than or equal to 20 degrees. The end face side of the buffer ring 4 close to the retainer ring 5 is provided with a plurality of oil return grooves 10, the oil return grooves 10 extend along the radial direction, and the oil return grooves 10 are distributed at intervals along the circumferential direction. The buffer ring 4 is used for reducing the impact and pressure of oil and providing a stable oil film for the main seal. The function of the support ring 3 is to provide a stable support for the cushion ring 4. The buffer ring 4 is impacted by piston motion and oil liquid when working, the high oil pressure side can rotate towards the outer side, and the support ring 3 is supported at the bottom of the buffer ring 4, so that a stable gap is ensured between the support ring and the piston in the rotation recovery process, and stable oil film supply is formed.

The retainer ring 5 and the support ring 3 are both provided with inclined notches 15, and the inclined notches 15 enable the retainer ring 5 and the support ring 3 to form a closed ring respectively after being closed, so that the installation is facilitated.

In terms of materials, the elastic support ring 1 is made of PPDI system polyurethane materials, the adjusting ring 2 is made of modified materials with nitrile rubber as base materials, the support ring 3 is made of nylon materials, the buffer ring 4 is made of modified polytetrafluoroethylene materials with the mass percentage of 20% -40%, and the check ring 5 is made of nylon materials. The retainer ring 5 and the support ring 3 are made of nylon materials, so that the strength is high, the temperature resistance is good, and good compression resistance and support effects can be achieved at high temperature. The elastic support ring 1 is made of PPDI system polyurethane material, the high-temperature pressure deformation performance of the elastic support ring is superior to that of common polyurethane, and the elastic support ring can provide lasting support force at high temperature. The adjusting ring 2 is made of a modified material with nitrile rubber as a base material, the modulus of elasticity of the nitrile rubber at high temperature is superior to that of hydrogenated nitrile, the rebound speed of polyurethane at high temperature is low, the following performance of the adjusting ring 2 is supplemented, and meanwhile the buffering ring 4 can be tightly held on the piston in a high-frequency working state. The buffer ring 4 is made of modified polytetrafluoroethylene, 20% -40% of bronze powder can be added into the buffer ring according to different types of breaking hammers, so that the strength of the buffer ring is improved, the polytetrafluoroethylene has good self-lubricating performance, the friction coefficient is extremely low, internal heat can be well reduced, and the service life of each part is prolonged.

The working principle of the utility model is as follows: under the pressurization state of the breaking hammer, oil impacts the buffer seal from the high-pressure oil side, the oil impacts a check ring 5 of the buffer seal in the first step, and the oil enters a first seal lip 13 of the buffer ring 4 through a gap between the wave patterns on the inner side of the check ring 5 and the piston; oil liquid enters the groove 7 from the oil return groove 10, pressure is applied to the groove 7, the groove 7 is pressurized radially, sealing is provided for the elastic support ring 1 and the cylinder body, holding force is provided for the buffer ring 4, and meanwhile, holding force is provided for the adjusting ring 2; oil passes through the first seal lip 13 of the buffer ring 4 under the action of high pressure, so that the first seal lip deforms and rotates a little at a fulcrum provided by the support ring 3, the oil reaches the second seal lip 14, and when the buffer ring 4 deforms and rotates, the gap between the second seal lip 14 and the piston does not change, so that the oil stably passes through to form an oil film.

Under the working pressure relief state of the breaking hammer cylinder, oil is relieved from the groove 7 through the oil return groove 10 and through the wavy lines of the retainer ring 5. When the piston impacts to generate vibration after the breaking hammer works and is pressurized, the adjusting ring 2 is hooped on the elastic support ring 1 to enable the elastic support ring 1 to rebound rapidly, and the buffering ring 4 is enabled to hold the piston tightly under the vibration through the elastic support ring 1.

Example 2

The difference from the above embodiment is that the present embodiment does not include the retainer ring 5, and can be used in a small-sized breaking hammer. Because the small-size breaking hammer has lower oil pressure impact, the buffer sealing function can be still completed under lower pressure after the check ring 5 is removed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a hydraulic pressure quartering hammer is sealed with novel buffering which characterized in that: comprises an elastic support ring (1), an adjusting ring (2), a support ring (3) and a buffer ring (4); the elastic support ring (1) and the support ring (3) are coaxial and adjacent to each other, the elastic support ring (1) and the support ring (3) are respectively connected with the buffer ring (4) in a sleeved mode, the adjusting ring (2) and the elastic support ring (1) are coaxial to be arranged, and are connected in the elastic support ring (1) in an embedded mode.

2. The new buffer seal for a hydraulic demolition hammer as claimed in claim 1, wherein: still include retaining ring (5), the both sides of elastic support ring (1) are put respectively in retaining ring (5) and support ring (3), just retaining ring (5) are laminated with the terminal surface side of elastic support ring (1), the gap is left with the terminal surface side of buffer ring (4) in retaining ring (5).

3. The new buffer seal for a hydraulic demolition hammer according to claim 1 or 2, characterized in that: the outer circular surface of the elastic support ring (1) is provided with a convex lip.

4. The new buffer seal for a hydraulic demolition hammer according to claim 1 or 2, characterized in that: fixing grooves (6) for mounting the adjusting ring (2) are formed in the axial symmetrical positions of the elastic support ring (1); the adjusting ring (2) can be a rectangular ring, a D-shaped ring, an O-shaped ring or a star-shaped ring.

5. The new buffer seal for a hydraulic demolition hammer as claimed in claim 2, wherein: the joint side of the elastic support ring (1) and the retainer ring (5) is provided with a circle of groove (7), the groove (7) divides the end face side of the elastic support ring (1) into a part A (8) and a part B (9), wherein the part A (8) is far away from the axis, the part B (9) is close to the axis, and the upper surface of the part A (8) is higher than that of the part B (9).

6. The new buffer seal for a hydraulic demolition hammer as claimed in claim 2, wherein: the buffer ring (4) is provided with a plurality of oil return grooves (10) on the end face side close to the retainer ring (5), the oil return grooves (10) extend along the radial direction, and the oil return grooves (10) are distributed at intervals along the circumferential direction.

7. The new buffer seal for a hydraulic demolition hammer as claimed in claim 1, wherein: the inner circle face of buffer ring (4) is provided with first seal lip (13) and curved second seal lip (14) that are inclined plane C (11) and inclined plane D (12) and constitute, and wherein inclined plane C (11) are towards the high pressure oil side, inclined plane D (12) deviate from the high pressure oil side, define inclined plane C (11) are E with axial contained angle, define inclined plane D (12) are F with axial contained angle, wherein E is greater than or equal to 40 and is less than or equal to 60, F is greater than or equal to 10 and is less than or equal to 20.

8. The new buffer seal for a hydraulic demolition hammer as claimed in claim 2, wherein: the check ring (5) and the support ring (3) are provided with inclined notches (15), and the check ring (5) and the support ring (3) form a closed ring shape respectively after the inclined notches (15) are closed.

9. The new buffer seal for a hydraulic demolition hammer as claimed in claim 2, wherein: the inner ring surface of the retainer ring (5) is wavy, and the distance between the wave crest and the wave trough is 0.2mm at most.

10. The new buffer seal for a hydraulic demolition hammer as claimed in claim 2, wherein: the elastic support ring (1) is made of a PPDI (poly-p-phenylene diisocyanate) system polyurethane material, the adjusting ring (2) is made of a modified material with nitrile rubber as a base material, the support ring (3) is made of a nylon material, the buffer ring (4) is made of a modified polytetrafluoroethylene material added with the modified polytetrafluoroethylene material with the mass percentage of 20% -40%, and the check ring (5) is made of a nylon material.