CN212822419U

CN212822419U - Air hammer

Info

Publication number: CN212822419U
Application number: CN202021703420.3U
Authority: CN
Inventors: 王春晓; 刘巍; 郭孝先; 周斌; 王卫东
Original assignee: Anyang Forging Press Numerical Control Equipment Co ltd
Current assignee: Anyang Forging Press Numerical Control Equipment Co ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-30
Anticipated expiration: 2030-08-13

Abstract

The utility model provides an air hammer, air hammer include the hammer stem, and the hammer stem is including linking firmly first portion and second portion as an organic whole, and first portion and second portion are the cylinder type, and first portion and second portion are coaxial, and second portion diameter is greater than first portion diameter, and the inside blind hole that is provided with of hammer stem, blind hole and first portion are coaxial, and the blind hole bottom surface is the sphere. The stepped structure at the bottom of the blind hole in the hammer rod is changed into a spherical structure, so that the stress concentration effect at the stepped structure can be effectively relieved, the strength and reliability of the hammer rod are improved, and the service life of the air hammer is prolonged.

Description

Air hammer

Technical Field

The utility model relates to a forging and pressing equipment technical field especially relates to an air hammer.

Background

With the rapid development of iron technology, chemical industry, surgical instruments and hand tool industries in recent years, the air hammer is gradually and widely applied to the forging industry with the advantages of high speed, high efficiency, economy and the like. The hammer rod of the air hammer is the most important key part of the air hammer and plays a vital role in forging work, different users in various industries have high requirements on the practicability and the strength performance of the hammer rod, and the traditional old-fashioned air hammer cannot meet the requirements of customers on the practicability and the strength performance of the hammer rod.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an air hammer for solving the problems of insufficient practicability and strength of the air hammer rod in the existing forging equipment.

The above purpose is realized by the following technical scheme:

the air hammer comprises a hammer rod, wherein the hammer rod comprises a first part and a second part which are fixedly connected into a whole, the first part and the second part are both cylindrical, the first part and the second part are coaxial, the diameter of the second part is larger than that of the first part, a blind hole is formed in the hammer rod, the blind hole is coaxial with the first part, and the bottom surface of the blind hole is a spherical surface.

In one embodiment, the hammer rod is arranged in the lead in a penetrating mode, and when the hammer rod moves to the upper limit position, the lower end face of the hammer rod is located below the lead.

In one embodiment, an upper anvil block is disposed on the hammer rod, an upper wedge is disposed between the upper anvil block and the hammer rod, and a dimension of the upper anvil block and/or the upper wedge along a radial direction of the hammer rod is greater than a diameter of the hammer rod.

In one embodiment, the blind hole is a stepped hole and comprises a first section and a second section, the diameter of the second section is larger than that of the first section, and the joint of the first section and the second section is an arc-shaped surface.

In one embodiment, the hammer rod is provided with a dovetail groove and a piston ring groove.

In one embodiment, the connection between the bottom of the dovetail groove and the groove wall is an arc-shaped surface, and the connection between the bottom of the piston ring groove and the groove wall is an arc-shaped surface.

The utility model has the advantages that:

Drawings

FIG. 1 is a cross-sectional view of a prior art old fashioned air hammer shank;

FIG. 2 is a schematic view of the prior art assembly of the hammer shaft and upper anvil of an old fashioned air hammer;

fig. 3 is a schematic view of the prior art assembly of the hammer shaft of an old air hammer and the upper anvil block in another viewing direction.

Fig. 4 is a cross-sectional view of an air hammer according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating an assembly of a hammer rod and an upper anvil block of the air hammer according to an embodiment of the present invention;

FIG. 6 is a schematic view of the assembly of the air hammer stem and upper anvil of FIG. 4 in another viewing orientation.

Wherein:

a hammer lever 100; a blind hole 101; a first portion 110; a dovetail groove 111; a second portion 120; a piston ring groove 121; an upper anvil block 200; an upper wedge 300; a loosening prevention device 400.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail by the following embodiments in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The numbering of the components themselves, such as "first", "second", etc., is used herein only to distinguish between the objects depicted and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The utility model provides an air hammer, air hammer include the hammer stem, as shown in fig. 4 to fig. 6, hammer stem 100 is including solid first portion 110 and the second portion 120 as an organic whole that links, and first portion 110 and second portion 120 are the cylinder type, and first portion 110 is coaxial with second portion 120, and second portion 120 diameter is greater than first portion 110 diameter, and hammer stem 100 is inside to be provided with blind hole 101, and blind hole 101 is coaxial with first portion 110, and blind hole 101 bottom surface is the sphere. The stepped structure at the bottom of the blind hole 101 in the hammer rod 100 is changed into a spherical structure, so that the stress concentration effect at the stepped structure can be effectively relieved, the strength and reliability of the hammer rod 100 are improved, and the service life of the air hammer is prolonged.

In one embodiment, the hammer rod 100 is disposed in the lead, and when the hammer rod 100 moves to the upper limit position, the lower end surface of the hammer rod 100 is located below the lead. The hammer shaft 100 is provided with an upper anvil 200, an upper wedge 300 is arranged between the upper anvil 200 and the hammer shaft 100, and the size of the upper anvil 200 and/or the upper wedge 300 along the radial direction of the hammer shaft 100 is larger than the diameter of the hammer shaft 100. The air hammer rod 100 is generally disposed within and slidable along a piston cylinder having a lead at the bottom to assist in sliding the hammer rod 100. The conventional hammer rod 100 has a short length, as shown in fig. 1, when the hammer rod 100 slides along the piston cylinder to an upper limit position, such that the lower end surface of the hammer rod 100 is located inside the lead, and when the upper anvil 200 is connected to the lower end surface of the hammer rod 100, the upper anvil 200 is also located inside the lead, so that the size of the upper anvil 200 in the radial direction of the hammer rod 100 needs to be smaller than the diameter of the lead, limiting the size of the upper anvil 200, as shown in fig. 2. In addition, an upper wedge 300 is further disposed between the upper anvil 200 and the hammer rod 100, and when the lead is frequently inserted and extracted, the upper wedge 300 may be loosened, so that the upper wedge 300 scratches the inner wall of the lead, thereby requiring an additional anti-loosening device 400, as shown in fig. 3. The utility model provides an air hammer with hammer stem 100 length extension for when hammer stem 100 was in last extreme position, the lower terminal surface of hammer stem 100 still was located outside the lead, therefore the upper anvil block 200 who is connected to hammer stem 100 lower terminal surface does not get into the lead all the time, therefore the size of upper anvil block 200 is not restricted by the lead size, can satisfy the customer to the demand of jumbo size upper anvil block 200, as shown in fig. 4 and 5; and because the upper wedge 300 does not enter the lead all the time, the inner wall of the lead is not scratched even if the upper wedge 300 is loosened, the anti-loosening device 400 can be omitted, as shown in fig. 6.

In one embodiment, the blind hole 101 is a stepped hole, and includes a first section and a second section, the diameter of the second section is larger than that of the first section, and the joint of the first section and the second section is an arc-shaped surface. The hammer lever 100 is provided with a dovetail groove 111 and a piston ring groove 121, the joint between the groove bottom of the dovetail groove 111 and the groove wall is an arc surface, and the joint between the groove bottom of the piston ring groove 121 and the groove wall is an arc surface. The connection between the surfaces of the holes, the grooves and other structures in the hammer rod 100 is changed into an arc transition form, so that the stress concentration phenomenon when the hammer rod 100 is stressed can be effectively relieved, and the service life of the hammer rod 100 is further prolonged.

Through above-mentioned embodiment, the utility model discloses an advantage includes at least: the hammer rod structure of the air hammer is lengthened, so that the air hammer is wider in application range, higher in strength and safety factor, and prolonged in service life by about 30% through calculation and practice, the problem that the service life of key wearing parts of the air hammer is short is solved, spare part cost is saved for users, and economic benefit is improved. And the appearance machining precision is improved, and the appearance is attractive and elegant. The application range of the air hammer is greatly expanded, and the requirements of a large number of domestic and foreign users are met.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The air hammer is characterized by comprising a hammer rod, wherein the hammer rod comprises a first portion and a second portion which are fixedly connected into a whole, the first portion and the second portion are cylindrical, the first portion and the second portion are coaxial, the diameter of the second portion is larger than that of the first portion, a blind hole is formed in the hammer rod, the blind hole is coaxial with the first portion, and the bottom surface of the blind hole is a spherical surface.

2. The air hammer of claim 1, wherein the hammer rod is disposed within a lead, and wherein the lower end surface of the hammer rod is below the lead when the hammer rod moves to the upper limit position.

3. The air hammer of claim 2, wherein the hammer shaft is provided with an upper anvil, an upper wedge is arranged between the upper anvil and the hammer shaft, and the upper anvil and/or the upper wedge has a dimension along the radial direction of the hammer shaft larger than the diameter of the hammer shaft.

4. The air hammer of claim 1, wherein the blind bore is a stepped bore including a first section and a second section, the second section having a diameter greater than the first section, the first section and the second section joining an arcuate surface.

5. The air hammer of claim 1, wherein the hammer shank is provided with a dovetail groove and a piston ring groove.

6. The air hammer of claim 5 wherein the junction between the dovetail groove bottom and the groove wall is an arcuate surface and the junction between the ring groove bottom and the groove wall is an arcuate surface.