Three-stroke cylinder and pneumatic system

Abstract

The application discloses a three-stroke cylinder and a pneumatic system, and belongs to the technical field of pneumatic transmission. The three-stroke cylinder comprises an outer cylinder body, an intermediate cylinder body located in the outer cylinder body, and a piston and a piston rod located in the intermediate cylinder body. The outer cylinder body is sequentially provided with a first air port, a second air port, a third air port and a fourth air port. The intermediate cylinder body is provided with a first spacing portion on the side away from the piston rod, and the first spacing portion separates the outer cylinder body into a first cavity and a second cavity. The first spacing portion is provided with a fifth air port. When the intermediate cylinder body is located at a retracted position, the third air port on the outer cylinder body is in communication with the fifth air port of the intermediate cylinder. When the intermediate cylinder body is located at an extended position, the second air port on the outer cylinder body is in communication with the fifth air port of the intermediate cylinder. The application solves the problems of uncontrollable intermediate position and complex air path in the existing multi-stroke cylinder.

Description

Technical Field

[0001] This invention relates to the field of pneumatic systems technology, and in particular to a three-stroke cylinder and a pneumatic system. Background Technology

[0002] A cylinder is a pneumatic actuator in a pneumatic transmission system that converts the pressure energy of compressed gas into mechanical energy, and it is widely used in various industries. Existing cylinders mainly consist of a cylinder barrel, end caps, a piston, a piston rod, and seals. The piston is located within the cylinder body formed by the cylinder barrel and end caps. One end of the piston rod is connected to the piston, and the other end extends out of the end cap and connects to the component being driven. Existing cylinders are generally single-stroke designs, with limited compression and motion strokes, which greatly restricts their application range and fields.

[0003] Therefore, the multi-stroke cylinder solved the aforementioned technical problems. However, existing ordinary multi-stroke cylinders typically require multiple cylinders connected in series, resulting in a long cylinder body and a large required space. While existing nested cylinders can achieve a longer stroke within limited installation space, these cylinders can only reliably guarantee the final stroke, with uncontrollable intermediate positions. Even if the cylinder can extend and retract in stages, the internal air circuit is complex and difficult to manufacture. Therefore, it is necessary to improve the existing cylinder structure to further enhance the practicality of cylinder products. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the middle position of existing multi-stroke cylinders is uncontrollable and the air circuit is complex.

[0005] To address the aforementioned technical problems, the present invention provides the following technical solution:

[0006] A three-stroke cylinder includes: an outer cylinder body, an intermediate cylinder body located within the outer cylinder body, and a piston and piston rod located within the intermediate cylinder body; wherein, the outer cylinder body is provided with a first vent, a second vent, a third vent, and a fourth vent in sequence; the intermediate cylinder body has a first partition portion on the side away from the piston rod, the first partition portion dividing the outer cylinder body into a first cavity and a second cavity; the first partition portion has a fifth vent; when the intermediate cylinder body is in the retracted position, the third vent on the outer cylinder body communicates with the fifth vent of the intermediate cylinder body; when the intermediate cylinder body is in the extended position, the second vent on the outer cylinder body communicates with the fifth vent of the intermediate cylinder body.

[0007] In some embodiments of the present invention, an elastic reset member is provided in the intermediate cylinder body, and the elastic reset member is located in the rod cavity of the intermediate cylinder body.

[0008] In some embodiments of the present invention, the intermediate cylinder is provided with a first end cap on the side away from the first interval portion, and a sliding sleeve is provided on the first end cap, and the piston rod is slidably connected to the sliding sleeve.

[0009] In some embodiments of the present invention, the elastic reset member is sleeved on the sliding sleeve and the piston rod.

[0010] In some embodiments of the present invention, the fifth vent includes a first hole extending axially along the cylinder and a second hole extending radially along the cylinder.

[0011] In some embodiments of the present invention, two first sealing grooves are provided on the first interval portion, and a first sealing ring is provided in the first sealing groove. The two first sealing grooves are respectively located on both sides of the second hole section of the fifth vent.

[0012] In some embodiments of the present invention, the piston is provided with a second sealing groove, and a second sealing ring is provided in the second sealing groove.

[0013] The present invention also provides a pneumatic system, including the above-mentioned three-stroke cylinder.

[0014] In some embodiments of the present invention, a first reversing valve and a second reversing valve are also included. The first output port of the first reversing valve is connected to the second vent port of the three-stroke cylinder, the second output port of the first reversing valve is connected to the third vent port of the three-stroke cylinder, the first output port of the second reversing valve is connected to the fourth vent port of the three-stroke cylinder, and the second output port of the second reversing valve is connected to the first vent port of the three-stroke cylinder.

[0015] In some embodiments of the present invention, the first reversing valve and the second reversing valve are center-leaking three-position five-way reversing valves, and a two-position three-way solenoid valve is provided on the pipeline between the first reversing valve and the gas source.

[0016] The technical solution of the present invention has the following technical effects compared with the prior art:

[0017] The cylinder provided by this invention comprises an outer cylinder body, an intermediate cylinder body, a piston, and a piston rod. The rodless chamber of the intermediate cylinder body can be connected to the second and third vent ports of the outer cylinder body through a fifth vent port. Thus, by using different air intake methods through the four vent ports on the outer cylinder body, the cylinder can be in four different positions and form three different strokes, and the three stroke positions are fixed and controllable. At the same time, the cylinder has a simple structure and low manufacturing cost. Attached Figure Description

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0019] Figure 1 A schematic diagram of a specific embodiment of the three-stroke cylinder provided by the present invention;

[0020] Figure 2 A working state diagram illustrating a specific embodiment of the three-stroke cylinder provided by the present invention;

[0021] Figure 3 This is a structural schematic diagram of a specific embodiment of the pneumatic system provided by the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 , Figure 2The diagram illustrates a specific embodiment of the three-stroke cylinder provided by the present invention. The cylinder includes an outer cylinder body 10, an intermediate cylinder body 20 located within the outer cylinder body 10, and a piston 30 and piston rod 40 located within the intermediate cylinder body 20. The outer cylinder body 10 has a first vent A, a second vent B, a third vent C, and a fourth vent D sequentially arranged along its cylinder wall. These four vents are connected to a pneumatic system, for example, to a directional valve or solenoid valve that controls the cylinder's travel direction. The intermediate cylinder body 20 is located away from... A first partition 21 is provided on one side of the piston rod 40. The first partition 21 is used to divide the outer cylinder 10 into a first cavity and a second cavity that are isolated from each other. A fifth vent E is provided on the first partition 21. When the intermediate cylinder 20 is in the retracted position, the third vent C on the outer cylinder 10 is connected to the fifth vent E of the intermediate cylinder. When the intermediate cylinder 20 is in the extended position, the second vent B on the outer cylinder 10 is connected to the fifth vent E of the intermediate cylinder 20.

[0027] With the above-described structure, this cylinder can achieve four-position, three-stroke operation. Specifically, when the cylinder is in the first initial position, such as... Figure 2 As shown in Figure 2-a, the intermediate cylinder 20 is located in a retracted position inside the outer cylinder 10, and the piston rod 40 is located in a retracted position inside the intermediate cylinder 20; when pressurized gas enters the first vent A and the third vent C of the cylinder, as... Figure 2 As shown in Figure 2-b, when the intermediate cylinder 20 is in the retracted position, the third vent C on the outer cylinder 10 is connected to the fifth vent E of the intermediate cylinder. Pressurized gas enters the intermediate cylinder 20 through the fifth vent E and pushes the piston 30 and piston rod 40 to the extended position, forming the first stroke S1, thus placing the cylinder in the second position. When pressurized gas enters through the fourth vent D of the cylinder, as... Figure 2 As shown in Figure 2-c, the pressurized gas pushes the intermediate cylinder 20 to the extended position, forming the second stroke S2, which places the cylinder in the third position. When the cylinder reaches the second stroke, the intermediate cylinder 20 reaches the extended position. At this time, the second vent B on the outer cylinder 10 connects with the fifth vent E of the intermediate cylinder 20. When pressurized gas enters through the second vent B and the fourth vent D, as... Figure 2 As shown in Figure 2-d, the pressurized gas can enter the intermediate cylinder 20 through the fifth vent E and push the piston 30 and piston rod 40 to the extended position, forming the third stroke S1+S2, so that the cylinder is in the fourth position; thus, the cylinder achieves four different positions and three strokes, and the three stroke positions are determined and controllable; at the same time, the cylinder has a simple structure and low processing and manufacturing cost.

[0028] Specifically, such as Figure 1As shown, the intermediate cylinder 20 is provided with an elastic reset member 50, which is located in the rod chamber of the intermediate cylinder 20. When there is no pressurized gas in the rodless chamber of the intermediate cylinder 20, the piston rod 40 is reset to the initial contraction position under the action of the elastic reset member 50.

[0029] Specifically, such as Figure 1 As shown, the intermediate cylinder 20 has a first end cap 22 on the side away from the first interval 21. The first end cap 22 has a sliding sleeve 23 extending along the axial direction of the cylinder. The piston rod 40 slides along the sliding sleeve 23, making the piston rod 40 slide more smoothly and move more easily.

[0030] Specifically, the elastic reset member 50 is sleeved on the sliding sleeve 23 and the piston rod 40, with one end abutting against the first end cap 22 and the other end abutting against the piston 30.

[0031] Specifically, such as Figure 1 As shown, the fifth vent E includes a first section E1 extending axially along the cylinder and a second section E2 extending radially along the cylinder. When the fifth vent is opposite to the second vent B or the third vent C, the pressurized gas enters the rodless chamber of the intermediate cylinder 20 through the second section E2 to the first section E1 along the second vent B or the third vent C. More specifically, the first section E1 is located at the axis of the intermediate cylinder, so that the pressurized gas acts evenly on the piston 30 in the intermediate cylinder 20, making the piston 30 drive the piston rod 40 to move more smoothly.

[0032] Specifically, the first spacer 21 is formed into a cylinder with a diameter larger than other areas of the intermediate cylinder 20, and the first spacer 21 is sealed to the outer cylinder 10; specifically, the first spacer 21 is provided with two first sealing grooves 21a along its cylindrical surface, and a first sealing ring is provided in the first sealing groove 21a. The two first sealing grooves 21a are respectively located on both sides of the second hole section E2 of the fifth vent E.

[0033] Specifically, the piston 30 is sealed to the intermediate cylinder 20; specifically, the piston 30 is provided with a second sealing groove 30a, and a second sealing ring is provided in the second sealing groove 30a.

[0034] like Figure 3The diagram shows a pneumatic system using the aforementioned three-stroke cylinder 100, comprising: a first reversing valve 200 and a second reversing valve 300. The first output port of the first reversing valve 200 is connected to the second air port B of the three-stroke cylinder 100, the second output port of the first reversing valve 200 is connected to the third air port C of the three-stroke cylinder 100, the first output port of the second reversing valve 300 is connected to the fourth air port D of the three-stroke cylinder 100, and the second output port of the second reversing valve 300 is connected to the first air port A of the three-stroke cylinder 100. Different strokes of the three-stroke cylinder 100 are controlled by controlling the first reversing valve 200 and the second reversing valve 300.

[0035] Specifically, the first reversing valve 200 and the second reversing valve 300 are center-leaking three-position five-way reversing valves, and a two-position three-way solenoid valve 400 is provided on the pipeline between the first reversing valve 200 and the gas source.

[0036] When using the above-described pneumatic system to adjust the position of the cylinder, when it is necessary to perform the following... Figure 2 When switching between the first and second positions, the two-position three-way solenoid valve 400 is energized, the first directional valve 200 switches to position R1, and the second directional valve 300 switches to position R2. At this time, air enters through the first vent A and the third vent C, and exhausts through the fourth vent D. The pressurized gas keeps the intermediate cylinder 20 in the retracted position and pushes the piston 30 to the extended position, thus realizing the switching of the cylinder from the first position to the second position. When the two-position three-way solenoid valve 400 is de-energized, the third vent C is depressurized, and the cylinder switches from the second position to the first position.

[0037] When switching between the second and fourth positions, the two-position three-way solenoid valve 400 is de-energized. At this time, the first directional valve 200 is in the neutral position. When the second directional valve 300 switches to the L2 position, air enters through the fourth vent port D and exhausts through the first vent port A, thus switching the cylinder from the second to the fourth position. When the second directional valve 300 switches to the R2 position, air enters through the first vent port A and exhausts through the fourth vent port D, thus switching the cylinder from the fourth to the second position.

[0038] When switching between the first and third positions, the two-position three-way solenoid valve 400 is de-energized. At this time, the first directional valve 200 is in the neutral position. When the second directional valve 300 switches to the L2 position, air enters through the fourth vent port D and exhausts through the first vent port A, thus switching the cylinder from the first position to the third position. When the second directional valve 300 switches to the R2 position, air enters through the first vent port A and exhausts through the fourth vent port D, thus switching the cylinder from the third position to the first position.

[0039] When switching between the third and fourth positions, the two-position three-way solenoid valve 400 is energized, the first directional valve 200 switches to the L1 position, the second directional valve 300 switches to the L2 position, air enters through the second vent B and the fourth vent D, and air exits through the first vent A. The pressurized gas keeps the intermediate cylinder 20 in the extended position. At the same time, the pressurized gas enters the intermediate cylinder 20 from the second vent B to the fifth vent E and pushes the piston 30 and piston rod 40 to the extended position, and the cylinder switches from the third position to the fourth position. When the two-position three-way solenoid valve 400 is de-energized, the second vent B is depressurized, and the cylinder switches from the fourth position to the third position under the action of the reset elastic element.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A three-stroke cylinder, characterized in that, include: The system comprises an outer cylinder, an intermediate cylinder located within the outer cylinder, and a piston and piston rod located within the intermediate cylinder; wherein, the outer cylinder is provided with a first vent, a second vent, a third vent, and a fourth vent in sequence; the intermediate cylinder is provided with a first partition on the side away from the piston rod, the first partition dividing the outer cylinder into a first cavity and a second cavity; and the first partition is provided with a fifth vent. When the intermediate cylinder is in the retracted position, the third vent on the outer cylinder is connected to the fifth vent on the intermediate cylinder; when the intermediate cylinder is in the extended position, the second vent on the outer cylinder is connected to the fifth vent on the intermediate cylinder.

2. A three-stroke cylinder according to claim 1, characterized in that, The intermediate cylinder is provided with an elastic reset member, which is located in the rod cavity of the intermediate cylinder.

3. A three-stroke cylinder according to claim 2, characterized in that, The intermediate cylinder has a first end cap on the side away from the first interval, and a sliding sleeve is provided on the first end cap. The piston rod is slidably connected to the sliding sleeve.

4. A three-stroke cylinder according to claim 3, characterized in that, The elastic reset element is sleeved on the sliding sleeve and the piston rod.

5. A three-stroke cylinder according to claim 1, characterized in that, The fifth vent includes a first section extending axially along the cylinder and a second section extending radially along the cylinder.

6. A three-stroke cylinder according to claim 5, characterized in that, Two first sealing grooves are provided on the first interval, and a first sealing ring is provided in the first sealing groove. The two first sealing grooves are respectively located on both sides of the second hole section of the fifth vent.

7. A three-stroke cylinder according to claim 1, characterized in that, The piston is provided with a second sealing groove, and a second sealing ring is provided in the second sealing groove.

8. A pneumatic system, characterized in that, Includes the three-stroke cylinder as described in any one of claims 1-7.

9. A pneumatic system according to claim 8, characterized in that, It also includes a first reversing valve and a second reversing valve. The first output port of the first reversing valve is connected to the second air port of the three-stroke cylinder. The second output port of the first reversing valve is connected to the third air port of the three-stroke cylinder. The first output port of the second reversing valve is connected to the fourth air port of the three-stroke cylinder. The second output port of the second reversing valve is connected to the first air port of the three-stroke cylinder.

10. A pneumatic system according to claim 9, characterized in that, The first and second directional valves are centrally vented three-position five-way directional valves, and a two-position three-way solenoid valve is provided on the pipeline between the first directional valve and the gas source.

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