Air cylinder device

Abstract

The air cylinder device comprises a cylinder body, a piston assembly and an air cylinder gland, an air cylinder cavity is formed in the cylinder body, the piston assembly is arranged in the air cylinder cavity and comprises a piston cylinder, a piston rod and a piston, the piston rod and the piston are connected with each other, and the air cylinder gland covers the outer surface of the opening side of the air cylinder cavity. The air cylinder gland is used for fixing the piston assembly, a through hole for reciprocating motion of the piston rod is formed in the middle of the air cylinder gland, the bottom of the piston cylinder is open, the piston, the side wall of the piston cylinder and the bottom wall of the air cylinder cavity jointly define a rodless cavity, and the rodless cavity is connected with an external air source through a first air path arranged on the bottom wall of the air cylinder cavity; a rod cavity of the piston cylinder comprises a standby pressure cavity connected with a rodless cavity. According to the air cylinder device, air is independently supplied to the rodless cavity through the first air path, the standby pressure cavity is communicated with the second air path through the air holes in the side wall of the piston cylinder to form an air pressure transition area, and the peak value of impact force at the tail end of the piston can be reduced through the structure; the pressure preparation cavity serves as a buffer partition of the rod cavity, back pressure is injected in advance through the second gas circuit before the piston moves to the tail end, and compared with a single-cavity structure, the response time is shortened.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic component technology, specifically, it relates to a cylinder device. Background Technology

[0002] A cylinder is an actuator in pneumatic transmission that converts the pressure energy of compressed air into mechanical energy. Existing cylinders are ordinary double-acting cylinders. When the piston moves at high speed to the end of its stroke, the single air passage structure cannot quickly establish reverse air pressure, causing the piston to inertially impact the cylinder body. Long-term use can easily lead to a decrease in positioning accuracy. Only a single-stage sealing ring is installed between the piston rod and the cylinder head, which is prone to gap leakage due to pressure pulsation under high-pressure conditions. Traditionally, the rod-side and rodless sides share the same air passage interface, resulting in a delay of about 0.5 seconds when switching air pressure. The integral cylinder body structure means that replacing the piston assembly requires the removal of all connecting pipelines, which takes an average of more than 40 minutes.

[0003] In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a cylinder device.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A cylinder device includes a cylinder body, a piston assembly, and a cylinder cover. The cylinder body has a cylinder cavity, and the piston assembly is disposed in the cylinder cavity, including a piston cylinder and a piston rod and a piston connected to each other. The cylinder cover covers the outer surface of the opening side of the cylinder cavity for fixing the piston assembly. The cylinder cover has a through hole in the middle for reciprocating movement of the piston rod. The bottom of the piston cylinder is open. The piston, the side wall of the piston cylinder, and the bottom wall of the cylinder cavity together form a rodless cavity. The rodless cavity is connected to an external air source through a first air passage disposed on the bottom wall of the cylinder cavity.

[0007] The piston cylinder has a rod chamber including a backup chamber connected to the rodless chamber and a motion chamber connected to the backup chamber. The backup chamber has a vent hole on its side wall, and a second air passage corresponding to the vent hole is provided at a corresponding position on the side wall of the cylinder chamber.

[0008] Furthermore, the inner wall of the piston cylinder is provided with a first protrusion and a second protrusion in sequence along the direction from the inside of the cylinder cavity outward. The bottom of the piston cylinder is open. The first protrusion and the bottom wall of the cylinder body define a rodless cavity. The second protrusion and the first protrusion define a pressure-reserving cavity. The second protrusion and the cylinder head define a moving cavity. The piston reciprocates in the working cavity.

[0009] Furthermore, the inner diameters of the rodless cavity, the pressure preparation cavity, and the motion cavity decrease sequentially.

[0010] Furthermore, the cylinder head is fixedly connected to the cylinder body by fixing bolts.

[0011] Furthermore, the fixing bolts are evenly distributed along the circumference of the cylinder head, and the number is 2-8.

[0012] Furthermore, the piston assembly also includes:

[0013] The sealing assembly includes a first sealing ring disposed between the air port and the bottom of the piston cylinder, and a second sealing ring disposed between the air port and the top of the piston cylinder.

[0014] Furthermore, the first sealing ring is disposed outside the side wall of the pressure preparation chamber; the second sealing ring is disposed outside the side wall of the motion chamber.

[0015] Furthermore, the first and second sealing rings are O-rings or fluororubber sealing rings.

[0016] Furthermore, the first gas path includes a high-pressure gas path and a low-pressure gas path.

[0017] After adopting the above technical solution, the cylinder device provided by this utility model has the following beneficial effects compared with the prior art.

[0018] 1. The cylinder device provided by this utility model has a rodless chamber that is independently supplied with air through a first air passage, and a backup pressure chamber that is connected to a second air passage through an air hole on the side wall of the piston cylinder to form a pressure transition zone. This structure can reduce the peak impact force at the piston end. The backup pressure chamber serves as a buffer zone for the rod chamber. Back pressure is injected in advance through the second air passage before the piston moves to the end, which shortens the response time compared to the single-chamber structure.

[0019] 2. The cylinder device provided by this utility model has a decreasing diameter design of rodless chamber > reserve chamber > moving chamber, which makes the pressure gradient and the direction of piston force form a dynamic balance, thereby improving energy conversion efficiency.

[0020] 3. The cylinder device provided by this utility model has a first sealing ring that isolates the high-pressure air path and a second sealing ring that prevents the backflow of pollutants. The dual-stage sealing structure effectively reduces the leakage rate.

[0021] 4. The cylinder device provided by this utility model has 2-8 fixing bolts distributed circumferentially to enable quick disassembly of the cylinder cover and shorten the replacement time of the piston assembly.

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0024] Figure 1 This is a cross-sectional view of the cylinder device provided by this utility model;

[0025] Figure 2 This is a cross-sectional view of the piston assembly in the cylinder device provided by this utility model;

[0026] Figure 3 This is a partial enlarged view of the piston assembly in the cylinder device provided by this utility model.

[0027] In the picture:

[0028] 1. Cylinder block;

[0029] 11. First gas path; 111. High-pressure gas path; 112. Low-pressure gas path;

[0030] 12. Second air passage;

[0031] 13. First pressure solenoid valve;

[0032] 14. Second pressure solenoid valve;

[0033] 15. First gas storage chamber;

[0034] 16. Second gas storage chamber;

[0035] 17. Third gas storage chamber;

[0036] 2. Piston assembly;

[0037] 21. Piston;

[0038] 22. Piston rod;

[0039] 23. Piston cylinder; 231. Rodless chamber; 232. Rod chamber; 2321. Reserve chamber; 2322. Moving chamber; 233. First boss; 234. Second boss;

[0040] 24. Sealing assembly; 241. First sealing ring; 242. Second sealing ring;

[0041] 25. Stomata;

[0042] 3. Cylinder gland;

[0043] 4. Fixing bolts.

[0044] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0046] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0047] In the description of this utility model, 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] [Example 1]

[0050] like Figure 1-3 As shown, this embodiment provides a cylinder device, including a cylinder body 1, a piston assembly 2, and a cylinder head 3. The cylinder body 1 has a cylinder chamber, and the piston assembly 2 is disposed within the cylinder chamber. The piston assembly 2 has a modular design, which facilitates quick disassembly and assembly and rapid maintenance.

[0051] Furthermore, the piston assembly 2 includes a piston cylinder 23 and a piston rod 22 and a piston 21 connected to each other. The cylinder cover 3 covers the outer surface of the opening side of the cylinder cavity and is used to fix the piston assembly 2. The cylinder cover 3 has a through hole in the middle for the piston rod 22 to reciprocate.

[0052] Furthermore, the bottom of the piston cylinder 23 is open, and the piston 21, the side wall of the piston cylinder 23, and the bottom wall of the cylinder cavity together form a rodless cavity 231. The rodless cavity 231 is connected to an external air source through a first air passage 11 provided on the bottom wall of the cylinder cavity. The rod cavity 232 of the piston cylinder 23 includes a backup pressure cavity 2321 connected to the rodless cavity 231, and a moving cavity 2322 connected to the backup pressure cavity 2321. The side wall of the rodless cavity 231 is slidably and tightly fitted with the piston 21, and the inner wall of the moving cavity 2322 is slidably and tightly fitted with the piston rod 22.

[0053] The side wall of the pressure-reservoir chamber 2321 is provided with an air hole 25, and a second air passage 12 corresponding to the air hole 25 is provided at the corresponding position on the side wall of the cylinder chamber. By controlling the external air source of the first air passage 11 and the second air passage 12 respectively, a pressure difference is generated between the rodless chamber 231 and the pressure-reservoir chamber 2321, and the reciprocating motion of the piston rod 22 is further realized under the action of the pressure difference. Specifically, when the air pressure in the rodless chamber 231 is greater than the air pressure in the pressure-reservoir chamber 2321, the piston rod 22 extends, and conversely, the piston rod 22 retracts. Furthermore, the rodless chamber 231 is independently supplied with air through the first air passage 11, and the pressure-reservoir chamber 2321 is connected to the second air passage 12 through the air hole 25 on the side wall of the piston cylinder 23 to form an air pressure transition zone. This structure can reduce the peak impact force at the end of the piston 21. The pressure-reservoir chamber 2321 serves as a buffer zone for the rod chamber 232. Back pressure is injected in advance through the second air passage 12 before the piston moves to the end, which shortens the response time compared to the single-chamber structure.

[0054] Furthermore, the inner wall of the piston cylinder 23 is provided with a first protrusion 233 and a second protrusion 234 sequentially from the inside of the cylinder cavity outward. The bottom of the piston cylinder 23 is open. The first protrusion 233 and the bottom wall of the cylinder body 1 define a rodless cavity 231. The second protrusion 234 and the first protrusion 233 define a pressure-reserving cavity 2321. The second protrusion 234 and the cylinder head 3 define a moving cavity 2322. The piston 21 reciprocates within the working cavity. In a preferred embodiment, the inner diameters of the rodless cavity 231, the pressure-reserving cavity 2321, and the moving cavity 2322 decrease sequentially. This decreasing diameter design (rodless cavity 231 > pressure-reserving cavity 2321 > moving cavity 2322) creates a dynamic balance between the pressure gradient and the direction of force on the piston, improving energy conversion efficiency.

[0055] Furthermore, the cylinder head 3 is fixedly connected to the cylinder body 1 by fixing bolts 4. In a preferred embodiment, the fixing bolts 4 are evenly distributed around the circumference of the cylinder head 3, with a quantity of 2-8. The 2-8 circumferentially distributed fixing bolts 4 enable quick disassembly of the cylinder head 3, shortening the replacement time of the piston assembly 2.

[0056] Furthermore, the piston assembly 2 also includes a sealing assembly, comprising a first sealing ring 241 disposed between the vent 25 and the bottom of the piston cylinder 23, and a second sealing ring 242 disposed between the vent 25 and the top of the piston cylinder 23. In a preferred embodiment, the first sealing ring 241 is disposed outside the side wall of the pressure chamber 2321, and the second sealing ring 242 is disposed outside the side wall of the moving chamber 2322. The first sealing ring 241 isolates the high-pressure air passage 111, and the second sealing ring 242 prevents backflow of contaminants; this dual-stage sealing structure effectively reduces the leakage rate.

[0057] In a preferred embodiment, the first sealing ring 241 and the second sealing ring 242 are O-rings or fluororubber rings.

[0058] [Example 2]

[0059] This embodiment provides a cylinder device with dual air passages. Based on the fact that the other structures are the same as those in the previous embodiment, the first air passage 11 of the cylinder device provided in this embodiment includes a high-pressure air passage 111 and a low-pressure air passage 112.

[0060] Specifically, the high-pressure air passage 111 and the low-pressure air passage 112 are respectively provided with a first air storage chamber 15, a second air storage chamber 16, a first pressure solenoid valve 13, and a second pressure solenoid valve 14. The first air storage chamber 15 and the second air storage chamber 16 are located in the side wall of the cylinder body 1, and the first pressure solenoid valve 13 and the second pressure solenoid valve 14 are located outside the bottom wall of the cylinder body 1.

[0061] The first and second air storage chambers 15 and 16 are respectively connected to an external air source. The opening and closing of the high-pressure air path 111 and the low-pressure air path 112, as well as the output air pressure, are controlled by adjusting the first and second pressure solenoid valves 13 and 14. The backup pressure chamber 2321 is connected to the third air storage chamber 17, which in turn is connected to an external air path. In operation, the third air storage chamber 17 inputs a constant third air pressure into the backup pressure chamber 2321. The rodless chamber 231 outputs either the first air pressure through the high-pressure air path 111 or the second air pressure through the low-pressure air path 112, where the first air pressure > the second air pressure > the third air pressure. This allows for easy pressure conversion by adjusting the first and second pressure solenoid valves 13 and 14, enabling the piston rod 22 to output different pressures. When piston reset is required, the output of the high-pressure air path 111 and the low-pressure air path 112 is closed.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A cylinder device, comprising a cylinder body, a piston assembly, and a cylinder head, wherein the cylinder body has a cylinder cavity, the piston assembly is disposed within the cylinder cavity, and includes a piston cylinder and a piston rod and a piston connected to each other, the cylinder head covers the outer surface of the opening side of the cylinder cavity for fixing the piston assembly, and the cylinder head has a through hole in the middle for reciprocating movement of the piston rod, characterized in that: The bottom of the piston cylinder is open, and the piston, the side wall of the piston cylinder and the bottom wall of the cylinder cavity together form a rodless cavity. The rodless cavity is connected to an external air source through a first air passage provided on the bottom wall of the cylinder cavity. The piston cylinder has a rod chamber including a backup chamber connected to the rodless chamber and a motion chamber connected to the backup chamber. The backup chamber has a vent hole on its side wall, and a second air passage corresponding to the vent hole is provided at a corresponding position on the side wall of the cylinder chamber.

2. The cylinder device according to claim 1, characterized in that: The inner wall of the piston cylinder is provided with a first protrusion and a second protrusion in sequence from the inside of the cylinder cavity outward. The bottom of the piston cylinder is open. The first protrusion and the bottom wall of the cylinder body define a rodless cavity. The second protrusion and the first protrusion define a pressure preparation cavity. The second protrusion and the cylinder head define a moving cavity. The piston reciprocates in the working cavity.

3. The cylinder device according to claim 1, characterized in that: The inner diameters of the rodless cavity, the pressure preparation cavity, and the motion cavity decrease sequentially.

4. The cylinder device according to claim 1, characterized in that: The cylinder head is fixedly connected to the cylinder body by fixing bolts.

5. The cylinder device according to claim 4, characterized in that: The fixing bolts are evenly distributed along the circumference of the cylinder cover, and the number is 2-8.

6. The cylinder device according to claim 1, characterized in that, The piston assembly also includes: The sealing assembly includes a first sealing ring disposed between the air port and the bottom of the piston cylinder, and a second sealing ring disposed between the air port and the top of the piston cylinder.

7. The cylinder device according to claim 6, characterized in that: The first sealing ring is disposed on the outside of the side wall of the pressure preparation chamber; The second sealing ring is disposed on the outside of the side wall of the moving cavity.

8. The cylinder device according to claim 6, characterized in that: The first and second sealing rings are O-rings or fluororubber rings.

9. The cylinder device according to claim 1, characterized in that: The first gas path includes a high-pressure gas path and a low-pressure gas path.

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