Instantaneous action cylinder

Abstract

The utility model provides an instantaneous action air cylinder, including cylinder body, piston, piston rod, control gas valve, piston rod, piston are equipped with the first hole, second hole respectively through the axial, second hole and first hole butt joint intercommunication form hole cavity, control gas valve is located the side of piston far away from piston rod, and it includes the tubular valve body that extends into cylinder body and is connected with it, the valve core that can axial movement is equipped with valve body one end, is connected in the end cover of valve body other end, valve core and valve body dynamic sealing connection, form the closed valve cavity between valve core and end cover, the control gas hole that is equipped with with valve cavity intercommunication is opened on end cover, when the valve cavity gas pressure is greater than hole cavity gas pressure, the valve core is at the first position that extends valve body and blocks up second hole is located the piston opening, the hole cavity can accumulate gas pressure rise, when the valve cavity gas pressure is less than hole cavity gas pressure, the valve core is at the second position that retracts valve body and opens the opening, the large amount of gas that accumulates in hole cavity can release along the opening, drive the instantaneous action of this air cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of cylinder technology, specifically relating to an instantaneous action cylinder. Background Technology

[0002] Cylinders are common driving components in mechanical equipment. They supply air to the cylinder cavity on the piston side through an air inlet, forcing the piston to move. This, in turn, drives the piston rod to push out or retract, thereby moving the components connected to the piston rod. Generally speaking, the diameter of the air inlet is small, and the amount of gas that can be introduced in a short time is limited. This makes it impossible to form a high air pressure in the cylinder cavity, resulting in a slow start-up action of the cylinder. This cannot meet the requirements of testing fields, such as drop testers, which require instantaneous cylinder action. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a momentary action cylinder.

[0004] To achieve the above objectives, the present invention employs a momentary action cylinder, comprising: a cylinder body, a piston, a piston rod connected to the piston, and a control valve connected to the cylinder body. The piston rod has a first through-hole extending axially, and the piston has a second through-hole extending axially. The second through-hole and the first through-hole are connected to form a cavity. The control valve is located on the side of the piston away from the piston rod and includes a tubular valve body extending into and connected to the cylinder body, a valve core axially movable at one end of the valve body, and an end cap connected to the other end of the valve body. The valve core and the valve body are dynamically sealed together, forming a sealed valve cavity between the valve core and the end cap. The end cap has a control air hole communicating with the valve cavity. When the air pressure in the valve cavity is greater than the air pressure in the hole cavity, the valve core is in a first position extending out of the valve body and blocking the second through-hole, which is open on the piston. The hole cavity can store gas and increase pressure. When the air pressure in the valve cavity is less than the air pressure in the hole cavity, the valve core is in a second position retracting the valve body and opening the opening. The gas stored in the hole cavity can be released along the opening, driving the cylinder to move momentarily.

[0005] Preferably, the diameter of the first hole is not less than the distance between the piston rod and the cylinder, and the diameter of the second hole is not less than the diameter of the first hole.

[0006] Preferably, the second hole is a stepped hole, the valve body extends into the large-diameter section of the second hole, and the opening is located on the stepped surface of the second hole.

[0007] More preferably, an annular guide cavity is formed between the outer wall of the valve body and the inner wall of the large-diameter section of the second hole.

[0008] More preferably, the valve body is provided with an outwardly extending first skirt and a second skirt, the first skirt being sealed to the inner wall of the cylinder, the second skirt being located outside the first skirt, and the second skirt being connected to the end of the cylinder.

[0009] More preferably, the control vent includes a first control vent and a second control vent that are vertically connected. The first control vent penetrates the end face of the end cap and communicates with the valve cavity, and the second control vent penetrates the side wall of the end cap.

[0010] More preferably, an L-shaped air nozzle is also inserted on the second skirt edge, and the air nozzle is locked in the opening of the second control hole.

[0011] Preferably, the valve body has an inwardly extending inner skirt at its end, and the valve core has an inwardly recessed end to form a guide post, which is movably inserted into the inner skirt.

[0012] More preferably, the end face of the guide post is provided with an annular groove, and an O-ring for sealing the opening is embedded in the annular groove.

[0013] Preferably, the first hole, the second hole, the piston rod, the piston, and the cylinder are coaxially arranged.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The instantaneous action cylinder provided by this utility model includes a cylinder body, a piston, a piston rod, and a control valve. The piston rod and piston are respectively provided with an axially penetrating first hole and a second hole. The second hole and the first hole are connected to form a cavity. The control valve is located on the side of the piston away from the piston rod. It includes a tubular valve body that extends into and is connected to the cylinder body, a valve core that can move axially at one end of the valve body, and an end cap connected to the other end of the valve body. The valve core and the valve body are dynamically sealed together, forming a sealed valve cavity between the valve core and the end cap. The end cap has a control air hole that communicates with the valve cavity. When the air pressure in the valve cavity is greater than the air pressure in the hole cavity, the valve core is in a first position where it extends out of the valve body and blocks the second hole, which is open on the piston. The hole cavity can store gas and increase pressure. When the air pressure in the valve cavity is less than the air pressure in the hole cavity, the valve core is in a second position where it retracts into the valve body and opens the opening. A large amount of gas stored in the hole cavity can be released along the opening, driving the cylinder to act instantaneously. Attached Figure Description

[0015] Figure 1 This is a longitudinal sectional view of a preferred embodiment of the present invention, in which the valve core is in the first position.

[0016] Figure 2 This is a longitudinal sectional view of a preferred embodiment of the present invention, in which the valve core is in the process of moving from the first position to the second position.

[0017] Figure 3 This is a longitudinal sectional view of a preferred embodiment of the present invention, in which the valve core is in the second position.

[0018] Wherein: 10. Cylinder body; 20. Piston; 21. Second hole; 22. Opening; 23. Annular guide cavity; 30. Piston rod; 31. First hole; 40. Control valve; 41. Valve body; 411. Inner skirt; 412. First skirt; 413. Second skirt; 414. Nozzle; 42. Valve core; 421. Guide post; 422. Annular groove; 423. O-ring seal; 43. End cap; 44. Control air hole; 441. First control hole; 442. Second control hole; 50. Cavity; 60. Valve cavity. Detailed Implementation

[0019] As shown in the figure Figures 1 to 3 As shown, the instantaneous action cylinder provided by this utility model includes: a cylinder body 10, a piston 20, a piston rod 30, and a control valve 40. The cylinder body 10 is cylindrical and vertically arranged. The piston 20 is vertically movable within the cylinder body 10, with its outer wall dynamically sealed to the inner wall of the cylinder body 10. The piston rod 30 is connected to the center of the piston 20 and extends vertically upwards. The upper end of the piston rod 30 passes through a valve-sealed end cap at the top of the cylinder body 10 and extends upwards. The control valve 40 is connected to the bottom of the cylinder body 10. The piston rod 30 has an axially penetrating first hole 31, and the piston 20 has an axially penetrating second hole 21. The first hole 31, the second hole 21, the piston rod 30, the piston 20, and the cylinder body 10 are coaxially arranged. The second hole 21 connects with the first hole 31, forming a cavity 50. The control valve 40 is located on the side of the piston 20 away from the piston rod 30. The piston 20 (lower side) includes a tubular valve body 41 extending into and connected to the cylinder body 10, a valve core 42 axially movable at one end of the valve body 41, and an end cap 43 connected to the other end of the valve body 41. The valve core 42 is coaxial with the valve body 41 and dynamically sealed, forming a sealed valve cavity 60 between the valve core 42 and the end cap 43. The end cap 43 has a control air hole 44 communicating with the valve cavity 60. When the air pressure in the valve cavity 60 is greater than the air pressure in the orifice 50, the valve core 42 is in the first position of extending out of the valve body 41 and blocking the second hole 21 located at the opening 22 on the lower end face of the piston 20, and the orifice 50 can store air and increase pressure. When the air pressure in the valve cavity 60 is less than the air pressure in the orifice 50, the valve core 42 is in the second position of retracting the valve body 41 and opening the opening 22, so that a large amount of gas stored in the orifice 50 is released instantaneously along the opening 22, driving the cylinder to move instantaneously.

[0020] The advantage of this design is that by simply supplying air to the valve chamber 60 through the control vent 44 to maintain a certain air pressure, air can be stored and pressurized in the cavity 50. When the pressure reaches the set value, the air supply through the control vent 44 is removed, allowing the control vent 44 to connect with the atmosphere or negative pressure. The gas in the cavity 50 can then push the valve core 42 to the second position, thereby releasing a large amount of gas in the cavity 50 instantly to do work. This structure greatly shortens the time required to supply a large amount of gas to the cavity on the piston 20 side of the cylinder 10 and significantly increases the upper limit of the gas supply, which can meet the requirements of drop testers and other testing instruments for instantaneous cylinder action.

[0021] To balance strength and gas release effect, in this embodiment, the diameter of the first hole 31 is not less than the distance between the piston rod 30 and the cylinder 10, and the diameter of the second hole 21 is not less than the diameter of the first hole 31. For convenient guidance, the second hole 21 is further a stepped hole, with the valve body 41 extending into the large-diameter section of the second hole 21. The opening 22 is located on the stepped surface of the second hole 21. An annular guide cavity 23 is formed between the outer wall of the valve body 41 and the inner wall of the large-diameter section of the second hole 21. Furthermore, the end of the valve body 41 is provided with an inwardly extending inner skirt 411, and the end of the valve core 42 is recessed to form a guide post 421. The guide post 421 is movably inserted into the inner skirt 411. To improve the sealing effect, the end face of the guide post 421 is provided with an annular groove 422, and an O-ring 423 for sealing the opening 22 is embedded in the annular groove 422.

[0022] For ease of connection, in this embodiment, the valve body 41 is provided with an outwardly extending first skirt 412 and second skirt 413. The first skirt 412 is sealed to the inner wall of the cylinder body 10, and the second skirt 413 is located outside the first skirt 412. The second skirt 413 extends to the end face of the cylinder body 10 and is locked to the end face of the cylinder body 10 by bolts. The second skirt 413 wraps around the outside of the end cover 43.

[0023] For ease of setup, in this embodiment, the control vent 44 includes a first control vent 441 and a second control vent 442 that are vertically connected. The first control vent 441 passes through the center of the end face of the end cap 43 and communicates with the valve cavity 60. The second control vent 442 passes through the side wall of the end cap 43. An L-shaped air nozzle 414 is also laterally inserted on the second skirt 413. The insertion end of the air nozzle 414 passes through the second skirt 413 and is locked at the opening of the second control vent 442.

[0024] It should be noted that the intake structure at the upper end of the piston rod 30 and the intake and exhaust structure at the upper end of the cylinder block 10 can be implemented using existing technologies, and will not be described in detail here.

[0025] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A momentary action cylinder, comprising: A cylinder block, a piston, a piston rod connected to the piston, and a control valve connected to the cylinder block, characterized in that: The piston rod has a first through hole extending axially, and the piston has a second through hole extending axially. The second hole connects with the first hole to form a cavity. The control valve is located on the side of the piston away from the piston rod. It includes a tubular valve body extending into and connected to the cylinder body, a valve core that can move axially at one end of the valve body, and an end cap connected to the other end of the valve body. The valve core and the valve body are dynamically sealed together, forming a sealed valve cavity between the valve core and the end cap. The end cap has a control air hole that communicates with the valve cavity. When the air pressure in the valve cavity is greater than the air pressure in the cavity, the valve core is in a first position where it extends out of the valve body and blocks the second hole, which is open on the piston. The cavity can store air and increase pressure. When the air pressure in the valve cavity is less than the air pressure in the cavity, the valve core is in a second position where it retracts into the valve body and opens the opening. The gas stored in the cavity can be released along the opening, driving the cylinder to move instantaneously.

2. The instantaneous action cylinder according to claim 1, characterized in that: The diameter of the first hole is not less than the distance between the piston rod and the cylinder body, and the diameter of the second hole is not less than the diameter of the first hole.

3. The instantaneous action cylinder according to claim 1, characterized in that: The second hole is a stepped hole, the valve body extends into the large-diameter section of the second hole, and the opening is located on the stepped surface of the second hole.

4. The instantaneous action cylinder according to claim 3, characterized in that: An annular guide cavity is formed between the outer wall of the valve body and the inner wall of the large-diameter section of the second hole.

5. The instantaneous action cylinder according to claim 3, characterized in that: The valve body is provided with a first skirt and a second skirt extending outward. The first skirt is sealed to the inner wall of the cylinder body, and the second skirt is located outside the first skirt and is connected to the end of the cylinder body.

6. The instantaneous action cylinder according to claim 5, characterized in that: The control vent includes a first control vent and a second control vent that are vertically connected. The first control vent penetrates the end face of the end cap and communicates with the valve cavity, while the second control vent penetrates the side wall of the end cap.

7. The instantaneous action cylinder according to claim 6, characterized in that: An L-shaped air nozzle is also inserted into the second skirt edge, and the air nozzle is locked into the opening of the second control hole.

8. The instantaneous action cylinder according to claim 1, characterized in that: The valve body has an inwardly extending inner skirt at its end, and the valve core is recessed at its end to form a guide post, which is movably inserted into the inner skirt.

9. The instantaneous action cylinder according to claim 8, characterized in that: The end face of the guide post is provided with an annular groove, and an O-ring for sealing the opening is embedded in the annular groove.

10. The instantaneous action cylinder according to claim 1, characterized in that: The first hole, the second hole, the piston rod, the piston, and the cylinder are coaxially arranged.

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