CN111608985A

CN111608985A - Gear punching oil cylinder

Info

Publication number: CN111608985A
Application number: CN202010490971.4A
Authority: CN
Inventors: 张小名; 高建波; 陈邦国
Original assignee: Xianghe Kai Hua Gear Co ltd
Current assignee: Xianghe Kai Hua Gear Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-09-01

Abstract

The invention discloses a gear punching oil cylinder, which comprises: a cylinder body; a piston provided in the cylinder and slidable along the cylinder, the piston dividing the interior of the cylinder into an upper chamber and a lower chamber; a gap is formed between the piston and the cylinder body; the upper piston rod is arranged at the upper end of the piston, and the upper end of the upper piston rod extends out of the upper end of the cylinder body; a lower piston rod disposed at a lower end of the piston, the lower end of the lower piston rod extending out of a lower end of the cylinder; an impact die fixed to a lower end of the lower piston rod; a seal ring provided between the cylinder and the piston; wherein: and a buffer cavity with increased volume is formed in a gap between the piston and the cylinder body above the sealing ring.

Description

Gear punching oil cylinder

Technical Field

The invention relates to the technical field of gear machining, in particular to an oil cylinder for stamping a gear.

Background

The blank for machining into the gear needs to be repeatedly forged, and in the prior art, the blank is forged by a stamping oil cylinder. The prior art stamping oil cylinder generally comprises a cylinder body, a piston arranged in the cylinder body, an upper piston rod arranged at the upper end of the piston, and a lower piston rod arranged at the lower end of the piston, wherein the upper end of the upper piston rod extends out of the upper end of the cylinder body, the lower end of the lower piston rod extends out of the lower end of the cylinder body, and an impact die is fixed at the lower end of the piston rod. The piston divides the cylinder body into an upper chamber and a lower chamber, oil ports are formed in the upper chamber and the lower chamber, the two oil ports are connected with a hydraulic pump through a hydraulic control element, the hydraulic pump drives the piston to move up and down through the hydraulic control element to alternately introduce hydraulic oil into the upper chamber and the lower chamber, and then the impact die at the lower end of the lower piston rod is driven to forge the blank.

On the outside of the piston, a sealing ring is usually provided, which serves to prevent the two chambers from being exposed to hydraulic oil. In fact, the piston and the cylinder body outside the sealed cavity have inevitable gaps to ensure free sliding of the piston.

When the impact die impacts the blank body, the blank body generates a large reaction force on the impact die, the reaction force is transmitted to the piston through the lower piston rod and is transmitted to the upper chamber, the pressure of hydraulic oil in the upper chamber is increased sharply, the pressure of the hydraulic oil in the lower chamber is small, and a large pressure difference exists between the upper chamber and the lower chamber, so that the hydraulic oil in the upper chamber can enter a gap between the piston and the cylinder body above the sealing ring at a large speed and pressure, the hydraulic oil with the large speed and pressure generates large impact on the sealing ring, and the service life of the sealing ring is greatly shortened under the frequent impact.

Disclosure of Invention

In order to solve the technical problems in the prior art, embodiments of the present invention provide a gear punching oil cylinder.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

a gear punching cylinder comprising:

a cylinder body;

a piston provided in the cylinder and slidable along the cylinder, the piston dividing the interior of the cylinder into an upper chamber and a lower chamber; a gap is formed between the piston and the cylinder body;

the upper piston rod is arranged at the upper end of the piston, and the upper end of the upper piston rod extends out of the upper end of the cylinder body;

a lower piston rod disposed at a lower end of the piston, the lower end of the lower piston rod extending out of a lower end of the cylinder;

an impact die fixed to a lower end of the lower piston rod;

a seal ring provided between the cylinder and the piston; wherein:

and a buffer cavity with increased volume is formed in a gap between the piston and the cylinder body above the sealing ring.

Preferably, the buffer chamber is defined by an annular groove formed on the piston and the cylinder body.

Preferably, the piston comprises a piston body and a wear-resistant sleeve sleeved on the piston body; the annular groove is formed in the outer side of the wear-resistant sleeve.

Preferably, the piston body comprises a base body and a connecting body fixedly connected with the base body by a fastener; a step part is formed on the base body, and the wear-resistant sleeve is nested on the step part.

Preferably, a flow guide hole is formed in the base body, one end of the flow guide hole penetrates through the annular groove, and the other end of the flow guide hole penetrates through the lower cavity.

Preferably, a check valve block is arranged at a port of the flow guide hole, which is located in the lower cavity, an inlet of the check valve block is communicated with the annular groove, and an outlet of the check valve block is communicated with the lower cavity.

Preferably, the guide holes include a plurality of guide holes arranged periodically, and each guide hole is provided with the check valve block.

Preferably, the wear-resistant sleeve is provided with an installation groove, and the sealing ring is arranged in the installation groove.

Preferably, the number of the sealing rings is two, and the two sealing rings are sleeved on the wear-resistant sleeve and arranged at intervals.

Preferably, the surface of the wear-resistant sleeve has a chromium plating layer.

Compared with the prior art, the gear stamping oil cylinder disclosed by the invention has the beneficial effects that:

1. the pressure of hydraulic oil in the clearance above the sealing ring can be effectively reduced by additionally arranging the buffer cavity in the clearance between the piston above the sealing ring and the cylinder body, so that the compression and impact of the hydraulic oil on the sealing ring can be effectively reduced, and the service life of the sealing ring can be effectively prolonged.

2. The sealing ring can not be pressed by hydraulic oil with overlarge pressure under the condition of extreme pressure by additionally arranging the flow guide hole and the one-way valve block.

The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a schematic structural diagram of a gear punching oil cylinder according to an embodiment of the present invention.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is an enlarged view of a portion B of fig. 2.

Reference numerals:

10-a cylinder body; 11-an upper chamber; 12-a lower chamber; 13-oil feeding port; 14-oil outlet; 20-a piston; 21-a piston body; 211-a base body; 212-a connecting body; 213-bolt; 22-a wear-resistant sleeve; 30-a sealing ring; 31-a mounting groove; 41-a buffer chamber; 42-flow guide holes; 43-one-way valve block; 50-clearance; 61-an upper piston rod; 62-lower piston rod; 70-impacting the mold; 100-blank.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1 to 3, an embodiment of the present invention discloses a gear punching oil cylinder for punching a blank 100 for machining a gear. This hydro-cylinder includes: cylinder 10, piston 20, wear sleeve 22, upper piston rod 61, lower piston rod 62, impact die and sealing ring 30.

The upper part of the cylinder body 10 is provided with an upper oil port 13, and the lower part of the cylinder body 10 is provided with a lower oil port 14; the piston 20 is installed in the cylinder 10 and can slide along the axial direction of the cylinder 10; the piston 20 divides the interior of the cylinder 10 into the upper chamber 11 and the lower chamber 12, and the external hydraulic pump alternately supplies hydraulic oil for driving the piston 20 to slide along the cylinder 10 to the upper chamber 11 and the lower chamber 12 through the upper oil port 13 and the lower oil port 14 by the control of the valve control element.

The lower end of the upper piston rod 61 is connected to the upper end of the piston 20, and the upper end of the upper piston rod 61 extends out of the upper end of the cylinder 10; the upper end of the lower piston rod 62 is connected to the lower end of the piston 20, and the lower end of the lower piston rod 62 protrudes out of the lower end of the cylinder 10.

An impact die for impacting the blank 100 to perform forging of the blank 100 is fixed to the lower end of the lower piston rod 62. Specifically, hydraulic oil is introduced into the upper chamber 11 to drive the piston 20 to move downwards, and the piston 20 moves downwards to drive the lower piston rod 62 to move downwards, so that the impact die impacts the blank 100.

In the present invention, the piston 20 includes a piston body 21 and a wear sleeve 22. The piston body 21 includes a base 211 and a connector 212, the cross-sections of the base 211 and the connector 212 are circular, a step is provided on the base 211, the wear-resistant sleeve 22 is sleeved on the step, the connector 212 is disposed above the base 211, the connector 212 is fixedly connected with the base 211 by a bolt 213 penetrating through the connector and screwed into the base 211, and thus, the wear-resistant sleeve 22 is disposed between the step surface of the base 211 and the connector 212. And, wear-resisting cover 22 adopts interference fit's mode with basic body 211 to set up, and this makes wear-resisting cover 22 and piston 20 realize close connection.

The outer diameter of the wear-resistant sleeve 22 is larger than the diameters of the base body 211 and the connecting body 212, and the wear-resistant sleeve 22 forms a gap 50 with the inner wall of the cylinder body 10, so that the outer peripheral surfaces of the base body 211 and the connecting body 212 are further away from the inner wall of the cylinder body 10. It is necessary to form the gap 50 between the wear sleeve 22 and the cylinder block 10 because: the piston 20 can slide along the cylinder 10 more freely by forming a gap 50 between the wear sleeve 22 and the cylinder 10.

The wear-resistant sleeve 22 is provided with a chromium plating layer on the outer circumferential surface thereof to reduce wear.

Two mounting grooves 31 are formed in the middle lower portion of the wear-resistant sleeve 22, the number of the sealing rings 30 is two, the two sealing rings 30 are respectively mounted in the two mounting grooves 31, the edge of each sealing ring 30 is in contact with the inner wall of the cylinder body 10, and therefore the piston 20 is integrally sealed with the cylinder body 10.

In the present invention, an annular groove is formed on the outer circumferential surface of the wear-resistant sleeve 22 located above the uppermost seal ring 30, the annular groove and the cylinder 10 together define a buffer chamber 41, the buffer chamber 41 is communicated with the gap 50, and the cross-sectional dimension is larger than the gap 50.

A flow guide hole 42 is formed in the base 211, and one end of the flow guide hole 42 penetrates through the buffer cavity 41, and the other end penetrates through the lower chamber 12. The guide holes 42 include a plurality of guide holes 42 arranged circumferentially.

A one-way valve block 43 is arranged at the port of each flow guiding hole 42 communicated with the lower chamber 12, the inlet of the one-way valve block 43 is communicated with the buffer cavity 41 through the flow guiding hole 42, and the outlet of the one-way valve block 43 is communicated with the lower chamber 12. And, a check valve block 43 having a certain opening pressure, specifically 0.3 to 0.5 times the maximum pressure of the upper chamber 11, is selected as the check valve block 43.

The working process of the oil cylinder is described as follows:

when the blank 100 needs to be forged, hydraulic oil is introduced into the upper chamber 11, so that the hydraulic oil in the lower chamber 12 flows back to an oil tank or an oil return port of a hydraulic pump, and the piston 20 drives the lower piston rod 62 to move downwards, so that the impact die finally contacts with the blank 100 and forges the blank 100.

While the blank 100 is being forged, the blank 100 generates a reaction force against the impact die, which is transmitted to the upper chamber 11 via the lower piston rod 62 and the piston 20, and thus, the pressure of the hydraulic oil in the upper chamber 11 is increased.

Accordingly, the gap 50 located above the cushion chamber 41 is filled with hydraulic oil, the pressure of which is also correspondingly large, and this causes the hydraulic oil, the pressure of which is large in the gap 50, to have a tendency to flow toward the lower chamber 12 due to the large pressure difference between the upper chamber 11 and the lower chamber 12.

However, due to the buffer chamber 41, the buffer chamber 41 has a larger volume than the gap 50, and the pressure of the hydraulic oil in the gap 50 is greatly reduced after the hydraulic oil flows into the buffer chamber 41, so that the pressure of the hydraulic oil in the gap 50 below the buffer chamber 41 is not greatly increased, and thus the seal ring 30 below the buffer chamber 41 is pressed and impacted by the hydraulic oil with a smaller pressure.

When the buffer chamber 41 is not enough to reduce the pressure of the hydraulic oil to a lower level, the buffer chamber 41 is communicated with the check valve block 43 through the diversion hole 42, so that the check valve block 43 is opened to allow the hydraulic oil in the buffer chamber 41 to flow to the lower chamber 12, and the hydraulic oil in the buffer chamber 41 is reduced to a lower level, and when the hydraulic oil is reduced to a lower level, the check valve block 43 is closed again.

After the blank 100 is forged and pressed, hydraulic oil in the upper chamber 11 returns to the oil tank or the oil return port of the hydraulic pump by introducing hydraulic oil into the lower chamber 12, so that the piston 20 drives the lower piston rod 62 to move upwards, and in the process, the one-way valve block 43 is in a closed state, and the hydraulic oil in the lower chamber 12 cannot flow to the upper chamber 11 through the one-way valve block 43.

The gear stamping oil cylinder provided by the invention has the advantages that:

1. the pressure of the hydraulic oil in the gap 50 above the sealing ring 30 can be effectively reduced by additionally arranging the buffer cavity 41 in the gap 50 between the piston 20 above the sealing ring 30 and the cylinder body 10, so that the compression and impact of the hydraulic oil on the sealing ring 30 can be effectively reduced, and the service life of the sealing ring 30 can be effectively prolonged.

2. The sealing ring 30 can not be pressed by hydraulic oil with excessive pressure under the condition of extreme pressure by additionally arranging the flow guide hole 42 and the check valve block 43.

Moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. A gear stamping oil cylinder is characterized by comprising:

a cylinder body;

an impact die fixed to a lower end of the lower piston rod;

a seal ring provided between the cylinder and the piston; wherein:

2. The gear stroke oil cylinder of claim 1 wherein said cushion chamber is defined by an annular groove formed in said piston in cooperation with said cylinder block.

3. The gear punching oil cylinder according to claim 2, wherein the piston comprises a piston body and a wear-resistant sleeve sleeved on the piston body; the annular groove is formed in the outer side of the wear-resistant sleeve.

4. The gear punching cylinder according to claim 3, wherein the piston body comprises a base body and a connecting body fixedly connected with the base body by a fastener; a step part is formed on the base body, and the wear-resistant sleeve is nested on the step part.

5. The gear punching oil cylinder according to claim 4, wherein a flow guide hole is formed in the base body, one end of the flow guide hole penetrates through the annular groove, and the other end of the flow guide hole penetrates through the lower cavity.

6. The gear punching oil cylinder according to claim 5, wherein a check valve block is installed at a port of the flow guide hole located in the lower chamber, an inlet of the check valve block is communicated with the annular groove, and an outlet of the check valve block is communicated with the lower chamber.

7. The gear punching oil cylinder according to claim 6, wherein the flow guide hole comprises a plurality of flow guide holes which are arranged periodically, and each flow guide hole is provided with the one-way valve block.

8. The gear punching oil cylinder according to claim 3, wherein the wear-resistant sleeve is provided with a mounting groove, and the sealing ring is mounted in the mounting groove.

9. The gear punching oil cylinder according to claim 8, wherein the number of the sealing rings is two, and the two sealing rings are sleeved on the wear-resistant sleeve and are arranged at intervals.

10. The gear stamping cylinder according to claim 3, wherein the surface of the wear sleeve has a chrome plating layer.