CN217121417U - Self-contained air cushion - Google Patents

Abstract

The application discloses a self-contained air cushion which is arranged below a workbench of a press machine, the air cushion comprises an upper cylinder body and a lower cylinder body, the lower cylinder body is connected to a machine body of the press machine, the upper cylinder body is slidably connected above the lower cylinder body, and the inner walls of the lower cylinder body and the upper cylinder body jointly define a closed air chamber; when the upper cylinder body moves downwards, the volume of the air chamber is reduced; when the upper cylinder moves upward, the volume of the air chamber becomes large. The air cushion of this application occupation space is little, low cost.

Description

Self-contained air cushion

Technical Field

The application relates to the field of material ejection and edge pressing of a press machine, in particular to a self-contained air cushion.

Background

The press machine air cushion is an important component of the press machine, is used for carrying out processes such as material ejection, stretch forming, drawing and edge pressing on parts, can increase the depth of a stretched workpiece by the press machine additionally provided with the air cushion, has the effects of facilitating ejection and preventing the surface of the workpiece from wrinkling, and generally needs to be additionally provided with an air source including an air compressor, an air bag and the like in cooperation with the air cushion to meet the working requirement so as to realize the purpose of stable work.

However, the additional use of an air bag is a problem that needs to be solved by those skilled in the art because it occupies a large space and is costly.

Disclosure of Invention

It is an object of the present application to provide a low-cost, self-contained air mattress that occupies a small space.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows:

a self-contained air cushion is arranged below a workbench of a press machine, and comprises an upper cylinder body and a lower cylinder body, wherein the lower cylinder body is connected to the machine body of the press machine, the upper cylinder body is slidably connected above the lower cylinder body, and the inner walls of the lower cylinder body and the upper cylinder body jointly define a closed air chamber;

when the upper cylinder moves downwards, the volume of the air chamber is reduced; when the upper cylinder moves upward, the volume of the air chamber becomes large.

The traditional press machine air cushion generally uses a fixed air cylinder to match with a movable piston, a piston rod is arranged on the piston and used for abutting against a workpiece, when a punch of the press machine moves downwards, the piston is driven by the press machine to move downwards, air in the air cylinder is discharged, and the workpiece completes the required working procedures; then the punch head of the press moves upwards, gas is injected into the cylinder, and the piston is pushed, so that the workpiece is ejected.

In the practical use process, because the punching force of the press is relatively large, a piston and a piston rod in a cylinder must be in the same axis with a punch of the press, otherwise the piston and the piston rod are easy to break; and the cylinder must cooperate and use other air supplies, for example gas bag etc. the volume that the gas bag occupied is bigger, if installation, design unreasonable still can bring the noise, influence life.

The self-contained air cushion utilizes the upper cylinder body and the lower cylinder body to form a closed air chamber, the upper cylinder body and the lower cylinder body are connected in a sliding manner, when a punch of a press machine moves downwards, the upper cylinder body is driven to move downwards, air in the air chamber is compressed, and the volume of the air chamber is reduced; when the punch of the press machine retreats, the gas in the gas chamber expands, the upper cylinder body moves upwards, the volume of the gas chamber is increased, and the working procedures of material ejection and the like are realized; and because the piston rod used for bearing is removed, the fault tolerance of the air cushion is increased, and even if the axis of the punch head of the press machine is not coincident with the axis of the air cushion and is buffered by the air in the air chamber, the air cushion is not easy to damage.

Further preferably, the air chamber comprises a movable air chamber and a fixed air chamber, when the upper cylinder moves downwards, the volume of the movable air chamber is reduced, and the volume of the fixed air chamber is unchanged; when the upper cylinder body moves upwards, the volume of the movable air chamber is increased, and the volume of the fixed air chamber is unchanged; the volume of the fixed air chamber is 6-8 times of that of the movable air chamber.

It is worth mentioning that 6-8 times of the volume of the positive displacement movable air chamber of the fixed air chamber is beneficial to the stable work of the air cushion, the ideal gas state equation PV is nRT, when the volume of the air chamber is reduced, the pressure of the gas is increased rapidly, so that a certain resistance is caused to a punch of the press, if the volume of the movable air chamber of the air chamber is too large, the pressure is too large, so that the resistance is too large, the problems of poor product quality, yield and the like are influenced, and the press is seriously damaged; therefore, the volume of the positive displacement movable air chamber of the fixed air chamber needs to be controlled to be 6-8 times.

In another preferred mode, a top plate is connected above the upper cylinder body and abuts against the workpiece; the top plate is provided with a blanking hole, the upper part of the upper cylinder body is provided with a blanking slide way communicated with the outside, and materials fall from the blanking hole and pass through the blanking slide way to be discharged out of the press machine.

The application range of the air cushion can be enlarged by utilizing the top plate to abut against the workpiece, and different top plates are used to match with presses or dies with different sizes on the premise of not changing the structure of the air cushion, so that the universality is realized; and set up blanking hole and set up in the blanking slide of external intercommunication on last cylinder body on the roof, make things convenient for the material after the punching press to drop from blanking hole and along with blanking slide discharge press, make things convenient for continuous operation.

Preferably, the upper cylinder body is sleeved outside the lower cylinder body, the inner wall of the lower cylinder body defines the fixed air chamber, and the inner wall of the upper cylinder body and the top surface of the lower cylinder body define the movable air chamber; a first cushion pad is arranged above the inner wall of the upper cylinder body.

Preferably, a limiting column is connected to the lower portion of the upper cylinder, the bottom of the limiting column extends out of the limiting portion, a limiting stopper is arranged at a position corresponding to the lower cylinder, and the limiting portion and the limiting stopper are suitable for limiting the upper cylinder to move upwards.

In the use, the air cushion of this application need not supplementary gas in addition, sets up the cylinder body upward movement in the restriction of spacing post, can increase the gas pressure in the air cushion, increases the rebound speed of cylinder, increases work efficiency, increases stability.

Preferably, a second cushion pad is arranged between the limiting part and the limiter, and the second cushion pad is suitable for limiting the upward impact force of the limiting column.

Preferably, the bottom of the lower cylinder body is provided with a ventilation hole and a sealing cover, the ventilation hole is communicated with the air chamber, and the sealing cover is suitable for sealing the ventilation hole.

In the use, sealed lid seals the breather, prevents that the air chamber from leaking gas, but uses one end time after, perhaps when just beginning to use, the gas pressure in the air chamber is lower, need fill the gas through sealed lid and breather toward the air chamber, increases gaseous original pressure, makes things convenient for it to only need follow-up work.

Another kind is preferred, the below of going up the cylinder body is connected with spacing post, the top of spacing post is provided with connecting portion, connecting portion pass through threaded connection spacing post, connecting portion detachably connects go up on the cylinder body, be provided with cylindrical threaded pin on the connecting portion, cylindrical threaded pin is suitable for the connection connecting portion with spacing post.

The limiting column is connected with the connecting portion through threads, and the connecting portion and the limiting column are further reinforced through the cylindrical threaded pin, so that the situation that the air cushion fails due to the fact that the limiting column is separated from the upper cylinder body due to repeated up-and-down reciprocating motion in the using process is avoided.

Further preferably, the outer wall of the lower cylinder body is provided with a sealing groove in a surrounding manner, the sealing groove is formed in the upper portion of the lower cylinder body, a sealing ring is arranged in the sealing groove, and the sealing ring is suitable for sealing the air chamber.

In another preferred embodiment, the air cushion comprises a stud, the lower cylinder body is detachably connected with the machine body through the stud, and double nuts are arranged on the stud and are suitable for limiting the displacement of the lower cylinder body.

Compared with the prior art, the beneficial effect of this application lies in:

(1) compared with the traditional scheme, the self-contained air cushion has smaller volume, removes a piston used in the traditional air cushion, realizes the back-and-forth movement of the upper cylinder body by utilizing the sliding of the upper cylinder body and the lower cylinder body, has simpler processing, is more convenient to use, does not need to be additionally provided with an air bag and the like, and has lower noise during working;

(2) the utility model provides a from holding formula air cushion at the during operation, its air chamber is kept apart with the external world, has reduced gas leakage's possibility to make the atmospheric pressure output in the air chamber more stable, and the part of this air cushion is less, makes things convenient for the later stage maintenance to change, improves the commonality and the durability of product.

Drawings

FIG. 1 is a schematic view of one embodiment of the self-contained cushion of the present application, showing the location and configuration of the various components;

FIG. 2 is an enlarged partial view of portion A of one embodiment of the self-contained air mattress of the present application, showing the connection portion and the cylindrical threaded pin;

FIG. 3 is an enlarged partial view of portion B of an embodiment of the self-contained air mattress of the present application, illustrating the seal groove and the seal ring;

FIG. 4 is a schematic view of an embodiment of the self-contained air mattress of the present application showing the minimum air chamber volume when the upper cylinder is in contact with the lower cylinder.

In the figure:

1. an upper cylinder body; 11. a top plate; 111. a blanking hole; 12. a first cushion pad; 13. a limiting column; 131. a limiting part; 132. a connecting portion; 1321. a cylindrical threaded pin; 14. a blanking slideway;

2. a lower cylinder body; 21. a stopper; 22. a sealing groove; 221. a seal ring; 23. a ventilation hole; 24. a sealing cover;

3. an air chamber; 31. a movable air chamber; 32. a fixed air chamber;

4. a second cushion pad;

5. a stud; 51. double nut

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be construed as limiting the specific scope of protection of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The traditional press machine air cushion generally uses a fixed air cylinder to match with a movable piston, a piston rod is arranged on the piston and used for abutting against a workpiece, when a punch of the press machine moves downwards, the piston is driven by the press machine to move downwards, air in the air cylinder is discharged, and the workpiece completes the required working procedures; then the punch head of the press moves upwards, gas is injected into the cylinder, and the piston is pushed, so that the workpiece is ejected.

In the practical use process, because the punching force of the press is relatively large, the piston and the piston rod in the cylinder must be in the same axis with the punch of the press, otherwise the piston and the piston rod are easy to break; and the cylinder must cooperate and use other air supplies, for example gas bag etc. the volume that the gas bag occupied is bigger, if installation, design unreasonable still can bring the noise, influence life.

Accordingly, the applicant has developed a self-contained air cushion, one embodiment of which is shown in fig. 1 to 4, installed below the table of a press, comprising an upper cylinder 1 and a lower cylinder 2, the lower cylinder 2 being fixed to the body of the press, the upper cylinder 1 being slidably connected above the lower cylinder 2, the lower cylinder 2 and the inner wall of the upper cylinder 1 together defining a closed air chamber 3; when the upper cylinder 1 moves downwards, the volume of the air chamber 3 becomes smaller; when the upper cylinder 1 moves upward, the volume of the air chamber 3 becomes large.

The self-contained air cushion utilizes the upper cylinder body 1 and the lower cylinder body 2 to form a closed air chamber 3, the upper cylinder body 1 and the lower cylinder body 2 are connected in a sliding manner, when a punch of a press machine moves downwards, the upper cylinder body 1 is driven to move downwards, air in the air chamber 3 is compressed, and the volume of the air chamber 3 is reduced; when the punch of the press machine retracts, the gas in the gas chamber 3 expands, the upper cylinder body 1 moves upwards, the volume of the gas chamber 3 is increased, and the processes of material ejection and the like are realized; and because the piston rod used for bearing is removed, the fault tolerance of the air cushion is increased, and even if the axis of the punch head of the press machine is not coincident with the axis of the air cushion and is buffered by the air in the air chamber 3, the air cushion is not easy to damage.

Further preferably, as shown in fig. 4, the air chamber 3 includes a movable air chamber 31 and a fixed air chamber 32, and when the upper cylinder 1 moves downward, the volume of the movable air chamber 31 becomes smaller and the volume of the fixed air chamber 32 does not change; when the upper cylinder 1 moves upward, the volume of the movable air chamber 31 becomes large, and the volume of the fixed air chamber 32 does not change; the volume of the fixed air chamber 32 is 6-8 times of that of the movable air chamber 31. As shown in fig. 2, the ram of the press moves downward, the upper cylinder 1 moves downward, the volume in the movable air chamber 31 becomes zero, and the volume in the fixed air chamber 32 remains unchanged; as shown in fig. 1, the ram of the press moves upward, the upper cylinder 1 moves upward, the volume in the movable air chamber 31 becomes large, and the volume in the fixed air chamber 32 does not change.

It is worth mentioning that 6-8 times of the volume-type movable air chamber 31 of the fixed air chamber 32 is beneficial to the stable work of the air cushion, and when the volume in the air chamber 3 is reduced, the pressure of the air is increased rapidly by an ideal gas state equation PV (nrT), so that a certain resistance is caused to a punch of the press, and if the volume of the movable air chamber 31 of the air chamber 3 is too large, the pressure is too high, so that the resistance is too high, the problems of poor product quality, yield and the like are influenced, and the press is seriously damaged; therefore, it is necessary to control the volume of the movable volumetric air chamber 31 of the fixed air chamber 32 to be 6 to 8 times.

In another preferred mode, as shown in fig. 1, a top plate 11 is connected above the upper cylinder body 1, and the top plate 11 abuts against the workpiece; the top plate 11 is provided with a blanking hole 111, the upper part of the upper cylinder body 1 is provided with a blanking slideway 14 communicated with the outside, and the material is suitable for falling from the blanking hole 111 and passing through the blanking slideway 14 to be discharged out of the press machine.

The application range of the air cushion can be enlarged by utilizing the top plate 11 to abut against the workpiece, and different top plates 11 are used to match with presses or dies with different sizes on the premise of not changing the structure of the air cushion, so that the universality is realized; and set up blanking hole 111 and set up the blanking slide 14 that the external world communicates on upper cylinder body 1 on roof 11, make things convenient for the material after the punching press to drop from the blanking hole and discharge the press along with blanking slide 14, make things convenient for continuous operation.

Further preferably, as shown in fig. 4, the upper cylinder 1 is sleeved outside the lower cylinder 2, the inner wall of the lower cylinder 2 defines a fixed air chamber 32, and the inner wall of the upper cylinder 1 and the top surface of the lower cylinder 2 define a movable air chamber 31; a first cushion pad 12 is arranged above the inner wall of the upper cylinder body 1.

When the upper cylinder body 1 moves downwards under the driving of the punch of the press, as shown in fig. 4, the upper cylinder body 1 and the lower cylinder body 2 touch at the limit position, and at the moment, the first cushion pad 12 is arranged on the contact surface of the upper cylinder body 1 and the lower cylinder body 2, so that the collision of the upper cylinder body 1 and the lower cylinder body 2 is prevented, the fracture failure of the upper cylinder body 1 and the lower cylinder body 2 is prevented, and the service life of the air cushion is prolonged to a limited extent.

Further preferably, as shown in fig. 1 and 4, a limiting column 13 is connected to the lower portion of the upper cylinder 1, the bottom of the limiting column 13 extends outwards from the limiting portion 131, a limiting stopper 21 is disposed at a corresponding position of the lower cylinder 2, and the limiting portion 131 and the limiting stopper 21 are adapted to limit the upward movement of the upper cylinder 1.

In the using process, the air cushion does not need to be supplemented with air additionally, the limiting column 13 is arranged to limit the upper cylinder body 1 to move upwards, so that the air pressure in the air cushion can be increased, the rebound speed of the upper cylinder body 1 is increased, the working efficiency is increased, and the stability is improved; as shown in figure 1, for last cylinder 1 upward movement to extreme position, spacing portion 131 and stopper 21 contact this moment, go up cylinder 1 and can not continue online motion, if do not install spacing post 13 additional, can make the gas pressure in the air chamber 3 lower on the contrary, go up cylinder 1 and the connection of lower cylinder 2 and lean on the frictional force between two cylinders, consequently the speed that goes up cylinder 1 and kick-back is slower, and use experience is relatively poor.

Alternatively, as shown in fig. 4, a second cushion 4 is disposed between the position-limiting part 131 and the position-limiting stopper 21, and the second cushion 4 is adapted to limit the upward impact force of the position-limiting column 13.

Because the resilience of the upper cylinder body 1 depends on the spontaneous expansion of the gas in the gas chamber 3, the gas pressure in the gas chamber 3 is higher, the resilience speed is higher, the resilience height is higher, the resilience force is larger, and therefore, in order to ensure the working efficiency, the gas with certain pressure needs to be filled, and the upper cylinder body 1 and the lower cylinder body 2 are ensured to not frequently hit the cylinder, so that the second cushion pad 4 is additionally arranged, the upward impact force of the limit column 13 is reduced, and the fracture failure of the upper cylinder body and the lower cylinder body is prevented.

Alternatively, as shown in fig. 4, the lower cylinder 2 is provided at the bottom thereof with a ventilating hole 23 and a sealing cover 24, the ventilating hole 23 being communicated with the air chamber 3, the sealing cover 24 closing the ventilating hole 23, the sealing cover 24 being adapted to prevent the ventilating hole 23 from being air-leaked during the operation of the air mattress.

In the use, sealed lid 24 seals breather 23, prevents that air chamber 3 from leaking gas, but after using a period, or when just beginning to use, the gas pressure in air chamber 3 is lower, needs to fill the gas in air chamber 3 through sealed lid 24 and breather 23, increases gaseous original pressure, makes things convenient for it only to need follow-up work.

Alternatively, as shown in fig. 2, the lower portion of the upper cylinder 1 is connected with the limit column 13, the upper portion of the limit column 13 is provided with a connecting portion 132, the connecting portion 132 is connected with the limit column 13 through a screw, the connecting portion 132 is detachably connected to the upper cylinder 1, the connecting portion 132 is provided with a cylindrical threaded pin 1321, and the cylindrical threaded pin 1321 is adapted to connect the connecting portion 132 and the limit column 13.

The cylindrical threaded pin 1321 is used for connecting the reinforcing connecting part 132 and the limiting column 13, and the limiting column is connected with the reinforcing connecting part 132 and the limiting column 13 through the cylindrical threaded pin 1321 except the threaded connecting part 132, so that the limiting column 13 is prevented from being separated from the upper cylinder body 1 due to repeated up-and-down reciprocating motion in the using process, and the air cushion is prevented from losing efficacy.

Further preferably, as shown in fig. 3, a sealing groove 22 is circumferentially provided on an outer wall of the lower cylinder 2, the sealing groove 22 is provided on an upper portion of the lower cylinder 2, a sealing ring 221 is provided in the sealing groove 22, and the sealing ring 221 is adapted to seal the air chamber 3.

The sealing ring 221 can reduce the problem that gas escapes from the gap between the upper cylinder 1 and the lower cylinder 2 during the working process, so that the gas pressure is reduced, and the ejection distance is not enough, or the rebound rigidity of the gas cushion is not high, and the force is not enough.

Preferably, the air cushion comprises a stud 5, the lower cylinder 2 is detachably connected with the machine body through the stud 5, and a double nut 51 is arranged on the stud 5, wherein the double nut 51 is suitable for limiting the displacement of the lower cylinder 2.

Because the lower cylinder body 2 is acted by impact force of cyclic reciprocation, the connection of the lower cylinder body 2 and the machine body needs to consider the anti-loosening technology, otherwise the lower cylinder body 2 is easy to separate from the machine body after being used for a long time, and the double nut 51 has lower cost and better effect in the anti-loosening technology, so the double nut 51 is used for preventing loosening.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (10)

1. A self-contained air cushion is arranged below a workbench of a press machine, and is characterized by comprising an upper cylinder body and a lower cylinder body, wherein the lower cylinder body is connected to the machine body of the press machine, the upper cylinder body is slidably connected above the lower cylinder body, and the inner walls of the lower cylinder body and the upper cylinder body jointly define a closed air chamber;

when the upper cylinder moves downwards, the volume of the air chamber is reduced; when the upper cylinder moves upward, the volume of the air chamber becomes large.

2. The self-contained air mattress as recited in claim 1, wherein said air chamber comprises a movable air chamber and a fixed air chamber, wherein when said upper cylinder moves downward, said movable air chamber becomes smaller in volume and said fixed air chamber becomes constant in volume; when the upper cylinder body moves upwards, the volume of the movable air chamber is increased, and the volume of the fixed air chamber is unchanged; the volume of the fixed air chamber is 6-8 times of that of the movable air chamber.

3. The self-contained air mattress of claim 1, wherein a top plate is attached to the upper portion of said upper cylinder, said top plate abutting the workpiece; the top plate is provided with a blanking hole, the upper part of the upper cylinder body is provided with a blanking slide way communicated with the outside, and materials fall from the blanking hole and pass through the blanking slide way to be discharged out of the press machine.

4. The self-contained air mattress of claim 2, wherein said upper cylinder is disposed about the exterior of said lower cylinder, the inner wall of said lower cylinder defining said fixed air chamber, the inner wall of said upper cylinder and the top surface of said lower cylinder defining said movable air chamber; a first cushion pad is arranged above the inner wall of the upper cylinder body.

5. The self-contained air cushion as claimed in claim 4, wherein a limiting post is connected to a lower portion of said upper cylinder, a bottom portion of said limiting post extends outwardly beyond a limiting portion, a limiting stopper is provided at a corresponding position of said lower cylinder, and said limiting portion and said limiting stopper are adapted to limit upward movement of said upper cylinder.

6. The self-contained cushion as claimed in claim 5, wherein a second cushion is provided between the stopper and the stopper, the second cushion being adapted to limit the upward impact force of the stopper.

7. The self-contained air mattress of claim 6, wherein said lower cylinder body is provided at a bottom thereof with ventilation holes communicating with said air chamber and with a sealing cover adapted to close said ventilation holes.

8. The self-contained air cushion as recited in claim 3, wherein a position-limiting post is connected to the lower portion of said upper cylinder, a connecting portion is disposed above said position-limiting post, said connecting portion is connected to said position-limiting post by screw threads, said connecting portion is detachably connected to said upper cylinder, said connecting portion is provided with a cylindrical threaded pin, and said cylindrical threaded pin is adapted to connect said connecting portion and said position-limiting post.

9. The self-contained air cushion as claimed in claim 2, wherein the outer wall of the lower cylinder is circumferentially provided with a sealing groove, the sealing groove is provided at the upper portion of the lower cylinder, and a sealing ring is provided in the sealing groove, the sealing ring being adapted to seal the air chamber.

10. The self-contained air mattress as recited in claim 1, wherein said air mattress includes studs through which said lower cylinder is removably connected to said frame, said studs having double nuts disposed thereon, said double nuts being adapted to limit displacement of said lower cylinder.

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