JP5702089B2 - Oil damper - Google Patents

Description

  The present invention relates to an oil damper, and more particularly, to an oil damper suitable for use in, for example, a forging vibration isolator supported by an air spring.

  The support for forging vibration isolator, etc. consists of an air spring and an oil damper. The impact speed generated by the forging machine's lowering of the hammer is extremely fast. When the forging machine descends, the damping force of the oil damper is reduced and the impact is received by the air spring. After the descent, the air spring is repelled, and when returning upward, the damping force of the oil damper is increased to quickly attenuate the swing of the forging machine and prevent the occurrence of vibration.

  However, the speed due to the lowering of the hammer of the forging machine is fast, and the durability of the functional parts inside the oil damper is impaired by the rapid flow of the working fluid inside the oil damper.

  As a conventional oil damper having such a structure, one disclosed in Patent Document 1 is known.

  The oil damper used in Patent Document 1 has the same structure as an oil damper for railways. When the oil damper is compressed by lowering the hammer, the oil damper is attached to the tip of the piston rod in order to reduce the damping force. The check valve is provided inside the piston to allow oil to pass through, but the check valve cannot be enlarged because it is built into the piston, and the check valve is damaged without being able to escape the fast flow rate. The problem of end up being included.

  If the check valve breaks, it will not be possible to generate the damping force of the oil damper required when returning upward, which suppresses the repulsion of the air spring after the hammer descends, and the damping against the shaking of the forging machine also deteriorates and vibration for forging is prevented. The function as an apparatus etc. will not be demonstrated.

  Also, in the usage environment of oil dampers used in vibration isolators for forgings, etc., the damping force generated by the oil dampers is converted into heat, and the heat dissipation conditions are not good, so there is a structure with heat dissipation and durability. That is where it is needed.

Registered Utility Model No. 3016168

  The problem to be solved by the present invention is that the damping force when the piston descends is small and a large damping force is generated when the piston returns upward in a usage mode in which it is incorporated in a vibration isolator for forging together with an air spring. Thus, the repulsive force of the air spring can be suppressed, and the overall structure is simple, and there is no heat damper, and there is no oil damper that can be suitably used for, for example, a forging vibration isolator.

The oil damper of the present invention is a single cylinder type, a lower end portion is closed by a lower mounting mechanism portion, an upper end portion is closed by a cylinder lid portion, and a cylinder body fixedly arranged via the lower mounting mechanism portion, A piston with a piston lower end faced in a state where a first oil chamber is formed on the lower end side in the cylinder body, and the piston is integrated with the piston, and the lower end is exposed to the first oil chamber. In addition, an upper base that is projected upward from the cylinder body through the cylinder lid and linked to the vertical movement of the hammer of the forging machine, which is an element having a large impact force when lowered, is connected to the protruding end side. A piston rod of a one-side rod type that reciprocates the piston in the vertical direction in the cylinder body, and a piston between the upper end surface of the piston and the cylinder lid portion in the cylinder body. A partition plate that is divided into a second oil chamber that stores hydraulic oil on the ton side and a third oil chamber that stores hydraulic oil on the cylinder lid side, and a first oil chamber provided in a through-penetrated manner in the piston. A flow path with a plate valve that distributes hydraulic oil only to the two oil chambers, and an orifice type flow path that distributes the hydraulic oil only from the second oil chamber to the third oil chamber provided in the partition plate, When the upper platform linked to the hammer of the forging machine is lowered, hydraulic fluid is supplied from the first oil chamber to the second oil chamber by a flow path with a plate valve according to the increase of the hydraulic pressure in the first oil chamber as the piston is pushed. Along with pouring, a small amount of working oil for the piston rod pushing volume accompanying the pushing of the piston in the second oil chamber is poured into the third oil chamber using the orifice throttle provided in the partition plate, and the damping when the piston is pushed in to reduce the force, in conjunction with the hammer of the forging machine The ascent of the gantry on that, by pouring the volume fraction of the large amount of the hydraulic oil in the second oil chamber with increasing piston in the third oil chamber by utilizing the aperture of the orifice provided in the partition plate, the piston rises during the decay The most important feature is that the power is increased.

According to the first aspect of the invention, the piston is provided a check plate of the plate valve type, the partition plate under the simplified configuration in which an orifice type flow path, it is the impact force is large elements at the time of falling forging descent of the gantry on interlocked with the vertical movement of the machine hammer, can be realized an opening and closing operation of each flow path corresponding to the flow of the hydraulic oil which moves at a high speed in the cylinder body in response to an increase, and, of the upper frame Since the damping force when the piston is pushed down due to the lowering is small and a large damping force is generated when the upper base is returned to the upper side, the oil damper is suitable for use in a manner to be incorporated into a vibration isolator for forging together with an air spring. Can be realized and provided.

  According to the second aspect of the present invention, in a use mode in which the air spring is incorporated into a vibration isolator for forging or the like, the damping force when the piston is lowered is small, and a large damping force is generated when the piston is returned upward. Therefore, the repulsive force of the air spring can be suppressed, vibration of the forging machine when the forging hammer is raised can be accurately prevented, and a plate valve type check plate is provided on the piston, Is provided with an orifice-type flow path, and the piston rod is provided with a hydraulic oil recirculation flow path consisting of a flow path inside the piston rod and a plate valve type check valve. Therefore, it is possible to realize an oil damper that can open and close each flow path corresponding to the flow of the gas and that is excellent in durability and heat dissipation.

  According to the third aspect of the invention, in addition to the same effects as the second aspect of the invention, a needle valve for adjusting the flow rate of the hydraulic fluid in the orifice channel provided in the partition plate is added to the piston body. Thus, an oil damper that can adjust the damping force of the oil damper itself can be realized and provided.

1 is a schematic cross-sectional view of an oil damper according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing the flow of hydraulic oil during the piston lowering operation of the oil damper according to the first embodiment. FIG. 3 is an explanatory diagram showing the flow of hydraulic oil during the piston raising operation of the oil damper according to the first embodiment. FIG. 1 is a schematic configuration diagram of a forging vibration isolator in which the oil damper according to the first embodiment is incorporated. FIG. 5 is a partial enlarged cross-sectional view illustrating a state where the oil damper according to the first embodiment is assembled in the forging pressure vibration isolator. FIG. 6 is a schematic sectional view of an oil damper according to a second embodiment of the present invention. It is. FIG. 7 is a graph showing the relationship between the piston speed and the damping force of the oil damper according to the first and second embodiments of the present invention.

The present invention is such that the damping force when the piston descends is small and a large damping force is generated when returning to the upper side of the piston to reduce the repulsive force of the air spring. In order to realize and provide an oil damper with a simple overall structure, heat dissipation, and durability, the bottom end is closed by the lower mounting mechanism and the top end is closed. The cylinder lower end face is formed in a state in which a cylinder main body that is closed by the cylinder lid portion and fixedly arranged via the lower attachment mechanism portion and a first oil chamber that stores hydraulic oil on the lower end side in the cylinder main body is formed. The exposed piston and the piston are integrated with each other, and the lower end of the piston faces the first oil chamber and projects upward from the cylinder body through the cylinder lid. Is, one rod type piston reciprocates the piston cradle is connected on interlocked with the vertical movement of the forging machine of the hammer impact force at the time of descent is greater element projecting end side in the vertical direction within the cylinder body A second oil chamber for storing hydraulic oil on the piston side between the upper end surface of the piston and the cylinder lid portion in the cylinder body, and a third oil for storing hydraulic oil on the cylinder lid side in the cylinder body A partition plate partitioned into a chamber, a flow path with a plate valve through which hydraulic oil flows only from the first oil chamber to the second oil chamber provided in a penetrating manner in the piston, and a second oil provided in the partition plate An orifice type flow path for flowing hydraulic oil only from the chamber to the third oil chamber, a position in the third oil chamber of the piston rod, and a flow path in the piston rod communicating with the first oil chamber through the piston rod; Flow path in this piston rod Anda hydraulic fluid return channel formed of a plate valve type check valve for circulating only hydraulic oil from the third oil chamber provided in a portion to the first oil chamber, rack on interlocked with hammer of the forging machine When the stand is lowered, the hydraulic oil is poured from the first oil chamber into the second oil chamber through the flow path with a plate valve in accordance with the increase in the oil pressure in the first oil chamber as the piston is pushed, and the piston in the second oil chamber A small amount of hydraulic oil corresponding to the pushing volume of the piston rod accompanying the pushing of the piston rod is poured into the third oil chamber using the orifice restriction provided on the partition plate, and the damping force when the piston is pushed down is reduced . When the platform linked to the hammer rises, a large amount of hydraulic oil in the volume of the second oil chamber as the piston rises is poured into the third oil chamber using the orifice throttle provided in the partition plate, and the piston rises. To increase the damping force In addition, this is realized by a configuration in which the working oil is recirculated from the third oil chamber to the first oil chamber through the piston rod passage and the check valve of the working oil reflux passage.

  Hereinafter, the oil damper 41 according to the first embodiment of the present invention, particularly the oil damper 41 suitable for a forging vibration isolator, will be described in detail.

  FIG. 1 shows a damper 41 according to a first embodiment of the present invention. The oil damper 41 has a single rod structure and is a single cylinder for improving heat dissipation and adopts an upright structure. doing.

The oil damper 41 according to the first embodiment has, for example, a cylindrical shape, and a cylinder body 1 that accommodates a piston 3 and a piston rod 2 therein, and an piston rod 2 that is integral with the piston 3 on the upper side of the cylinder body 1. A cylinder lid portion 5 that is closed in a slidably penetrating state, and a state in which the piston rod 2 penetrates the central portion on the upper side of the cylinder lid portion 5 and is fitted to the outer periphery of the cylinder body 1 For example, a cylindrical lid cylinder portion 7 arranged at the lower portion of the cylinder main body 1, a lower attachment mechanism portion 31 arranged in a state of closing the lower end opening of the cylinder main body 1, and an upper portion of the lid cylindrical portion 7. And an upper attachment mechanism portion 32 arranged.
The lower attachment mechanism 31 is configured to attach and fix the cylinder body 1 vertically to a fixing member 80 of a forging vibration isolator 61, which will be described in detail later.

  The lower mounting mechanism 31 is mounted in close contact with the lower end opening of the cylinder body 1 and forms a first oil chamber 51 between the piston 3 and the mounting body 33. A lower mounting member 35 is provided which projects downward from the lower surface side of 33 and is integrally formed with a projecting screw body 34 provided with a screw on the outer periphery of the projecting end side.

  Further, the lower attachment mechanism 31 includes a substantially cylindrical lower anti-vibration rubber 6B fitted to the outer periphery of the protruding screw body 34, and a space between the lower surface of the mounting body 33 and the upper surface of the lower anti-vibration rubber 6B. The heat-resistant plate 8 interposed in a state where the protruding screw body 34 penetrates, the end washer 14 attached to the lower surface of the lower vibration isolating rubber 6B in a state where the protruding screw body 34 penetrates, and the protruding screw body 34 are provided. A nut 27 that is screwed onto the screw and a split pin 28 that fits into the end of the protruding screw 34 are provided.

  Then, a fixing portion of the forging machine is disposed at an intermediate position in the vertical direction of the lower vibration isolating rubber 6B with the intermediate washer 16 interposed therebetween, and the nut 27 is tightened, whereby the cylinder body 1 is anti-vibration device 61 for forging. The fixing member 80 is configured to be fixed vertically.

  The upper attachment mechanism portion 32 includes a substantially cylindrical upper vibration-proof rubber 6A fitted on the outer peripheral portion of the piston rod 2 protruding upward from the lid tube portion 7.

  Further, the upper mounting mechanism 32 is heat resistant to be interposed in a state where the piston rod 2 penetrates between the upper surface of the lid plate 7a disposed at the upper end of the lid cylinder portion 7 and the lower surface of the upper vibration isolating rubber 6A. A plate 8, an end washer 14 attached to the upper surface of the upper antivibration rubber 6 </ b> A in a state where the piston rod 2 penetrates, a nut 27 screwed into a screw provided at the upper end of the piston rod 2, and the piston rod 2 and a split pin 28 to be fitted into the upper end portion.

  As will be described in detail later, the upper base 75, which is a vertical movement member that moves up and down in conjunction with the forging hammer 71a of the forging machine 71, is attached to the intermediate washer 16 at the intermediate position in the vertical direction of the upper vibration isolating rubber 6A. The piston rod 2 and the piston 3 are configured to move up and down in conjunction with the vertical movement of the hammer of the forging machine by arranging the nut 27 and tightening the nut 27.

  The upper anti-vibration rubber 6A and the lower anti-vibration rubber 6B are disposed for the purpose of shock buffering and absorbing the displacement of the vertical mounting posture.

  Next, the structure inside the cylinder body 1 and the cylinder lid 5 will be described in detail.

Inside the cylinder body 1 and the cylinder lid 5, the piston rod 2 is slidable between the mounting body 33, the piston 3, the cylinder lid 5, and the piston 3 and the cylinder lid 5. A first oil chamber (A oil chamber) 51, a second oil chamber (B oil chamber) 52 for storing hydraulic oil, respectively, in the cylinder body 1 by an annular partition plate 4 provided in a penetrating manner, The third oil chamber (C oil chamber) 53 is divided into three chambers.
In FIG. 1, the first oil chamber 51 is indicated by the letter “A”, the second oil chamber 51 is indicated by the letter “B”, and the third oil chamber 51 is indicated by the letter “C”. ing. The same applies to the cases shown in FIG. 2, FIG. 3 and FIG.

  That is, the first oil chamber 51 is disposed between the mounting body 33 and the lower surface in FIG. 1 of the piston 3, and the first oil chamber 51 is disposed between the upper surface in FIG. 1 of the piston 3 and the lower surface in FIG. Two oil chambers 52 are respectively formed between the upper surface of the partition plate 4 in FIG. 1 and the lower surface of the cylinder lid 5 in FIG. 1.

  The piston rod 2 is provided with a third oil chamber side opening 2a at a position occupying the third oil chamber 53, and the first oil passes through the piston rod 2 from the third oil chamber side opening 2a. A flow path 2b in the piston rod that communicates with the chamber 51 is provided, and further, for example, a plate valve type check is performed in the middle of the flow path 2b in the piston rod (for example, a position close to the first oil chamber 51 at the center position of the piston 3). A valve 9 is provided to constitute a hydraulic oil recirculation flow path.

  The check valve 9 is configured to function as a check valve that circulates hydraulic oil only in the direction from the third oil chamber 53 toward the first oil chamber 51.

  The piston 3 has a piston flow path 3a that allows the first oil chamber 51 and the second oil chamber 52 to communicate with each other, and a plate-valve type valve disposed at a position facing the second oil chamber 52 of the piston flow path 3a. A check plate 11 is provided.

  The check plate 11 is configured to function as a check valve that circulates hydraulic oil only in the direction from the first oil chamber 51 toward the second oil chamber 52.

  The partition plate 4 has an orifice 4 a and a flow path 4 b that allow the second oil chamber 52 and the third oil chamber 53 to communicate with each other and distribute the hydraulic oil only in the direction from the second oil chamber 52 to the third oil chamber 53. Provided.

  A bush 21 that guides the outer periphery of the piston rod 2 and prevents leakage of hydraulic oil is provided on the inner periphery of the partition plate 4.

  A bush 21 that guides the outer periphery of the piston rod 2 and prevents leakage of hydraulic oil is also provided on the inner periphery of the end of the cylinder lid 5 on the third oil chamber 53 side.

A packing (U-packing) 22 that prevents leakage of hydraulic fluid is provided on the inner peripheral portion of the cylinder lid portion 5 at the middle position in the vertical direction. Further, dust is prevented from entering the upper end of the cylinder lid portion 5. A packing 23 (dust seal) is provided.

In the oil damper 41 according to the first embodiment, the area of the cross section of the piston rod 2 (the cross section in the direction orthogonal to the length direction of the piston rod 2) and the area of the second oil chamber 52 (the length of the cylinder body 1). The ratio of the cross-sectional area in the direction orthogonal to the vertical direction is set to 1: 5 or more.
Next, a schematic configuration of the vibration isolator 61 for forging in which the oil damper 41 according to the first embodiment is incorporated will be described with reference to FIGS. 4 and 5.

  As shown in FIGS. 4 and 5, the forging vibration isolator 61 forms a bottom surface of the forging machine 71 and receives a large impact force when the forging hammer 71a is lowered, and a floor as an installation surface. The oil damper 41 and the air spring 74 are arranged between the lower base 76 on the surface (or the ground) 73 and the air damper 74.

  That is, the forging vibration isolator 61 forms a recess 72 a in the base 72 of the forging machine 71, closes the upper base 75, which is a vertically moving member, to the base 72, and the spacer 77 on the lower base 76. A plurality of air springs 74 are arranged at predetermined intervals via the upper part, and each upper mounting mechanism portion 32 of, for example, three oil dampers 41 configured to absorb the impact of the forging hammer 71a in the forging machine 71 is mounted on the overhead. It is vertically arranged in a state of being connected to the table 75 and facing the recess 72a.

  Further, the lower attachment mechanism 31 of the oil damper 41 is connected to a fixing member 80 provided in the forging vibration isolator 61 so that the cylinder body 1 of the oil damper 41 is supported in a vertical arrangement. Yes.

The air spring 74 is supplied with air from a fluid supply source (not shown) through an air pipe 78, and the pressure of the air supplied to the air spring 74 is adjusted by a level adjusting unit 79 to adjust the air spring 74. The level of the forging machine 71 itself is adjusted by increasing or decreasing the pressure.
In the forging vibration isolator 61 described above, the air spring 74 is configured to sufficiently absorb a large impact when the forging hammer 71a of the forging machine 71 is lowered and to prevent vibration.

Next, the operation of the oil damper 41 according to the first embodiment will be described with reference to FIGS. 2 and 3 in relation to the lowering and raising operations of the forging hammer 71a of the forging machine 71. FIG.
The oil damper 41 according to the first embodiment is configured to generate a small damping force when the forging hammer 71a of the forging machine 71 is lowered, and to generate a large damping force when the forging machine 71 is raised. doing.

  That is, during the lowering operation of the forging hammer 71a of the forging machine 71, the air spring 74 sufficiently absorbs a large impact from the forging hammer 71a and, as shown in FIG. 2, accompanying the lowering operation of the forging hammer 71a. Thus, the piston 3 integral with the piston rod 2 is pushed downward to press the hydraulic oil in the first oil chamber 51.

At this time, the check plate 11 provided on the second oil chamber 52 side of the piston 3 is opened according to the increase of the oil pressure in the first oil chamber 51, and the hydraulic oil in the first oil chamber 51 is in the second oil chamber 52. Flows in.
Further, in the second oil chamber 52, the amount of oil corresponding to the pushing volume of the piston rod 2 accompanying the pushing of the piston 3 passes through the orifice 4a of the partition plate 4 and flows into the third oil chamber 53. Therefore, the damping force when the piston of the oil damper 41 is pushed by the restriction of the orifice 4a is small.

  Furthermore, the volume increase of the piston rod 2 pushed into the cylinder body 1 when the piston rod 2 is pushed in compresses the gas (air) Cb in the space formed in the upper part of the third oil chamber 53. It absorbs by its volume change.

  Next, when the forging hammer 71a of the forging machine 71 changes from the descending operation to the ascending operation, as shown in FIG. 3, the piston 3 integrated with the piston rod 2 ascends (extends) with the ascending operation of the forging hammer 71a. Then, the hydraulic oil in the second oil chamber 52 is pressed, and the amount of oil corresponding to the volume of the second oil chamber 52 flows into the third oil chamber 53 through the orifice 4a of the partition plate 4, but the amount of oil is large. Therefore, the damping force when the piston of the oil damper 41 is raised by the restriction of the orifice 4a is larger than that when the piston is pushed in.

  As a result, the repulsive force of the air spring 74 can be sufficiently suppressed by the large damping force when the piston is raised by the oil damper 41, and the vibration of the forging machine 71 can be suppressed.

  Further, when the piston 3 is raised, the hydraulic oil in the third oil chamber 53 is opened from the third oil chamber side opening 2a provided at a position always below the oil surface Ca in the piston rod 2 to the center. The plate valve type check valve 9 provided at the lower part of the piston rod 2 is opened through the piston rod internal flow path 2b and sucked into the first oil chamber 51 side, whereby the air to the first oil chamber 51 is sucked. It is possible to prevent the first oil chamber 51 from being in a vacuum state while preventing mixing, and to prepare for the next lowering operation of the forging hammer 71a.

  According to the oil damper 41 according to the first embodiment, the damping force when the piston 3 is lowered is small and the piston 3 returns to the upper side in a usage mode in which the oil damper 41 is incorporated into the forging vibration isolator 61 together with the air spring 74. At times, a large damping force can be generated to suppress the repulsive force of the air spring 74, and the vibration of the forging machine 71 can be prevented accurately when the forging hammer 71a is lifted. A suitable oil damper 41 can be obtained.

  Further, according to the oil damper 41 according to the first embodiment, the piston 3 is provided with the plate-valve type check plate 11 that distributes the hydraulic oil only from the first oil chamber 51 to the second oil chamber 52, and the second The partition plate 4 that divides the oil chamber 52 and the third oil chamber 53 is provided with an orifice 4a and a flow path 4b through which hydraulic oil flows only from the second oil chamber 52 to the third oil chamber 53. Therefore, the flow corresponding to the flow of hydraulic fluid moving at a high speed can be obtained without adopting a configuration in which a check valve is provided inside the piston as in the conventional example. The oil damper 41 can realize the opening / closing operation of the road and has excellent durability and heat dissipation.

  Further, the piston rod 2 is provided with a hydraulic oil recirculation flow path comprising a piston rod flow path 2b and a plate valve type check valve 9, thereby preventing air from entering the first oil chamber 51. However, it is possible to prevent the first oil chamber 51 from being in a vacuum state, and to make the oil damper 41 fully prepared for the next lowering operation of the forging hammer 71a.

  FIG. 6 shows an oil damper 41A according to the second embodiment of the present invention. The basic configuration of the oil damper 41A is the same as that of the oil damper 41 according to the first embodiment, and therefore, the same components have the same reference numerals. The detailed description is omitted.

  The oil damper 41A according to the second embodiment is provided with an orifice 4a in the partition plate 4 and a needle fitted from the outer peripheral side of the cylinder body 1 into a flow path 4b extending from the orifice 4a to the third oil chamber 53. The amount of oil flowing from the second oil chamber 52 to the third oil chamber 53 can be adjusted by facing the tip of the valve 10 and rotating the needle valve 10 from the outside. That is, the damping force of the oil damper 41A can be adjusted from the outside. It is characterized by being adjustable.

  According to the oil damper 41A according to the second embodiment, the same effect as in the case of the oil damper 41 according to the first embodiment is obtained, and by adding the needle valve 10, the damping force of the oil damper 41A is externally applied. For example, there is an advantage that it is possible to easily cope with a change in the specification of the vibration impact characteristics of the vibration isolator 61 for forging.

FIG. 7 is a graph showing the relationship between the piston speed and the damping force of the oil dampers 41 and 41A, with the horizontal axis representing the piston speed (cm / s) and the vertical axis representing the damping force (kgf).
In FIG. 7, the dotted line indicates the characteristics of the oil damper disclosed in Patent Document 1, and the solid line indicates the characteristics of the oil dampers 41 and 41A according to the first and second embodiments.
As shown in FIG. 7, the oil dampers 41 and 41A according to the first and second embodiments have a smaller damping force when the piston is pushed in (compression side) than the oil damper disclosed in Patent Document 1, and when the piston is raised (extension side). In this case, the orifice characteristic is simple and the relief valve is not used.

  The oil damper of the present invention has a different damping force between when the piston is lowered and when it is raised, and has increased durability and heat dissipation.Therefore, the air damper has an air cooling effect on heat dissipation generated by the shock absorber. Needless to say, the present invention can be widely applied to factory equipment used in an environment that cannot be expected.

DESCRIPTION OF SYMBOLS 1 Cylinder main body 2 Piston rod 2a 3rd oil chamber side opening part 2b Piston rod flow path 3 Piston 3a Piston flow path 4 Bulkhead plate 4a Orifice 4b Flow path 5 Cylinder cover part 6A Upper vibration-proof rubber 6B Lower vibration-proof rubber 7 Lid cylinder part 7a Lid plate 8 Heat-resistant plate 9 Check valve 10 Needle valve 11 Check plate 14 End washer 16 Intermediate washer 21 Bush 22 Packing 23 Packing 27 Nut 28 Split pin 31 Lower attachment mechanism 32 Upper attachment mechanism 33 Attachment body 34 Protruding screw body 35 Lower attachment tool 41 Oil damper 41A Oil damper 51 First oil chamber 52 Second oil chamber 53 Third oil chamber 61 Forging vibration isolator 71 Forging machine 71a Forging hammer 72 Base 72a Concavity 73 Floor surface 74 Air spring 75 Upper stand 76 Lower stand 77 Spacer 78 Air Pipe 79 Level adjustment part 80 Fixing member Ca Oil surface Cb Gas

Claims (3)

A cylinder main body that is a single cylinder type, the lower end portion is closed by the lower mounting mechanism portion, the upper end portion is closed by the cylinder lid portion, and fixedly arranged via the lower mounting mechanism portion,
A piston facing the lower end surface of the piston in a state of forming a first oil chamber for storing hydraulic oil at the lower end side in the cylinder body;
The piston is configured integrally with the lower end facing the first oil chamber, protrudes upward from the cylinder body through the cylinder lid, and has an impact force when lowered on the protruding end side. A one-sided rod-type piston rod that is connected to an upper base linked to the vertical movement of the hammer of a forging machine, which is a large element, and reciprocates the piston in the vertical direction within the cylinder body;
In the cylinder main body, a second oil chamber for storing hydraulic fluid on the piston side and a third oil chamber for storing hydraulic oil on the cylinder lid side are disposed between the upper end surface of the piston and the cylinder lid portion. Partition walls to partition,
A flow path with a plate valve through which hydraulic fluid flows only from the first oil chamber to the second oil chamber provided in a penetrating arrangement in the piston;
An orifice type flow path for flowing hydraulic oil only from the second oil chamber to the third oil chamber provided in the partition plate;
Have
When the upper platform linked to the hammer of the forging machine is lowered, hydraulic fluid is supplied from the first oil chamber to the second oil chamber by a flow path with a plate valve according to the increase of the hydraulic pressure in the first oil chamber as the piston is pushed. Along with pouring, a small amount of working oil for the piston rod pushing volume accompanying the pushing of the piston in the second oil chamber is poured into the third oil chamber using the orifice throttle provided in the partition plate, and the damping when the piston is pushed in Reduce the force,
When the upper base linked to the hammer of the forging machine is raised, a large amount of hydraulic oil corresponding to the volume in the second oil chamber accompanying the rise of the piston is poured into the third oil chamber using an orifice throttle provided in the partition plate. And configured to increase the damping force when the piston is raised,
Oil damper characterized by. A cylinder main body that is a single cylinder type, the lower end portion is closed by the lower mounting mechanism portion, the upper end portion is closed by the cylinder lid portion, and fixedly arranged via the lower mounting mechanism portion,
A piston facing the lower end surface of the piston in a state of forming a first oil chamber for storing hydraulic oil at the lower end side in the cylinder body;
The piston is configured integrally with the lower end facing the first oil chamber, protrudes upward from the cylinder body through the cylinder lid, and has an impact force when lowered on the protruding end side. A one-sided rod-type piston rod that is connected to an upper base linked to the vertical movement of the hammer of a forging machine, which is a large element, and reciprocates the piston in the vertical direction within the cylinder body;
In the cylinder main body, a second oil chamber for storing hydraulic fluid on the piston side and a third oil chamber for storing hydraulic oil on the cylinder lid side are disposed between the upper end surface of the piston and the cylinder lid portion. Partition walls to partition,
A flow path with a plate valve through which hydraulic fluid flows only from the first oil chamber to the second oil chamber provided in a penetrating arrangement in the piston;
An orifice type flow path for flowing hydraulic oil only from the second oil chamber to the third oil chamber provided in the partition plate;
A position in the third oil chamber of the piston rod, a passage in the piston rod that communicates with the first oil chamber through the inside of the piston rod, and a third oil chamber provided in a part of the passage in the piston rod from the first. A hydraulic oil return flow path comprising a plate valve type check valve that distributes the hydraulic oil only to the oil chamber;
Have
When the upper platform linked to the hammer of the forging machine is lowered, hydraulic fluid is supplied from the first oil chamber to the second oil chamber by a flow path with a plate valve according to the increase of the hydraulic pressure in the first oil chamber as the piston is pushed. In addition to pouring, a small amount of hydraulic oil for the piston rod pushing volume accompanying the pushing of the piston in the second oil chamber is poured into the third oil chamber using the orifice throttle provided in the partition plate, Decreasing the damping force,
When the upper base linked to the hammer of the forging machine is raised, a large amount of hydraulic oil corresponding to the volume in the second oil chamber accompanying the rise of the piston is poured into the third oil chamber using an orifice throttle provided in the partition plate. Thus, the damping force when the piston is raised is increased, and the working oil is recirculated from the third oil chamber to the first oil chamber via the piston rod flow passage and the check valve of the working oil recirculation flow passage. about,
Oil damper characterized by. A cylinder main body that is a single cylinder type, the lower end portion is closed by the lower mounting mechanism portion, the upper end portion is closed by the cylinder lid portion, and fixedly arranged via the lower mounting mechanism portion,
A piston facing the lower end surface of the piston in a state of forming a first oil chamber for storing hydraulic oil at the lower end side in the cylinder body;
The piston is configured integrally with the lower end facing the first oil chamber, protrudes upward from the cylinder body through the cylinder lid, and has an impact force when lowered on the protruding end side. A one-sided rod-type piston rod that is connected to an upper base linked to the vertical movement of the hammer of a forging machine, which is a large element, and reciprocates the piston in the vertical direction within the cylinder body;
In the cylinder main body, a second oil chamber for storing hydraulic fluid on the piston side and a third oil chamber for storing hydraulic oil on the cylinder lid side are disposed between the upper end surface of the piston and the cylinder lid portion. Partition walls to partition,
A flow path with a plate valve through which hydraulic fluid flows only from the first oil chamber to the second oil chamber provided in a penetrating arrangement in the piston;
An orifice type flow path for flowing hydraulic oil only from the second oil chamber to the third oil chamber provided in the partition plate;
A position in the third oil chamber of the piston rod, a passage in the piston rod that communicates with the first oil chamber through the inside of the piston rod, and a third oil chamber provided in a part of the passage in the piston rod from the first. A hydraulic oil return flow path comprising a plate valve type check valve that distributes the hydraulic oil only to the oil chamber;
A needle valve that is fitted from the outer peripheral side of the cylinder body so as to face the orifice type flow path and adjusts the amount of oil flowing from the second oil chamber to the third oil chamber;
Have
When the upper platform linked to the hammer of the forging machine is lowered, hydraulic fluid is supplied from the first oil chamber to the second oil chamber by a flow path with a plate valve according to the increase of the hydraulic pressure in the first oil chamber as the piston is pushed. Along with pouring, a small amount of working oil for the piston rod pushing volume accompanying the pushing of the piston in the second oil chamber is poured into the third oil chamber using the orifice throttle provided in the partition plate, and the damping when the piston is pushed in Reduce the force,
When the upper base linked to the hammer of the forging machine is raised, a large amount of hydraulic oil corresponding to the volume in the second oil chamber accompanying the rise of the piston is poured into the third oil chamber using an orifice throttle provided in the partition plate. And increasing the damping force when the piston is raised, and returning the hydraulic oil from the third oil chamber to the first oil chamber through the piston rod flow passage and the check valve of the hydraulic oil return flow passage,
That the damping force can be adjusted by operating the needle valve;
Oil damper characterized by.