Pressurizing air cylinder

Abstract

The pressurizing air cylinder comprises a front cylinder body and a rear cylinder body which are connected through a middle end cover, a front piston, a supporting rod and a front piston rod are arranged in the front cylinder body, a rear piston and a rear piston rod are arranged in the rear cylinder body, and the supporting rod, the front piston, the front piston rod, the rear piston and the rear piston rod are coaxially arranged; the middle of the supporting rod and the middle of the front piston rod are each provided with a cavity formed in the length direction, and the cavity of the supporting rod is communicated with the cavity of the front piston rod to form a closed oil way cavity. When the front piston moves back and forth, an oil way cavity formed by the front piston rod and the supporting rod is filled with a liquid medium (oil), when the front piston moves, the space size of the oil way cavity is changed, when the front piston stops moving, the pressure of the space of the oil way cavity can be changed by moving the rear piston, the pressurizing effect is achieved, and the pressure is transmitted to the front piston rod through the supporting rod.

Description

Technical Field

[0001] The present invention relates to the technical field of cylinders, and in particular to a supercharged cylinder. Background Art

[0002] In the field of modern industrial automation and mechanical engineering, cylinders are widely used as the main actuators in various systems that require linear motion control and drive. However, due to the limitations of their structure and materials, ordinary cylinders usually have the problem of low pressure. This lack of pressure not only limits the application range of the cylinder, but also affects its driving efficiency and response speed.

[0003] In order to deal with the problem of insufficient pressure in ordinary cylinders, various types of booster cylinders have appeared on the market, which are mainly achieved by increasing the working pressure of the cylinder or changing the working mode of the cylinder. For example, using a high-pressure gas source, increasing the diameter or length of the cylinder, and improving the sealing structure of the cylinder. However, these methods still face many challenges in practical applications, such as increased system complexity, slow response speed, and rising costs. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned background technology, the present invention provides a supercharging cylinder which can effectively increase the cylinder pressure and has good response speed and low cost.

[0005] Technical solution: A booster cylinder comprises a front and a rear cylinder body connected by an intermediate end cover, wherein the front cylinder body is provided with a front piston, a supporting rod and a front piston rod, and the rear cylinder body is provided with a rear piston and a rear piston rod, and the supporting rod, the front piston rod and the rear piston rod are coaxially arranged; the middle parts of the supporting rod and the front piston rod are respectively provided with cavities opened along the length direction, and the supporting rod cavity is connected with the front piston rod cavity to form a closed oil circuit cavity; the front piston rod and the supporting rod are connected in a sealed movable manner, and the volume of the oil circuit cavity can be changed as the two move relative to each other; the rear end of the supporting rod is sealed and movablely sleeved on the rear piston rod, and the outer wall of the rear end is sealed and connected to the intermediate end cover, and the relative movement of the rear piston rod and the supporting rod can change the volume of the oil circuit cavity; it also includes an oil circuit channel connecting the oil circuit cavity and the oil supply end, and the movement of the rear piston rod can close or open the oil circuit channel.

[0006] In addition, it is particularly preferred that a circular hole allowing the support rod to pass through is provided in the middle of the intermediate end cover, and a radially recessed annular groove is provided on the side wall of the circular hole, and the oil circuit includes a first channel radially penetrating the side wall of the intermediate end cover and the annular groove and several second channels circumferentially arranged on the side wall of the support rod connecting the support rod cavity and the annular groove.

[0007] In addition, it is particularly preferred that it also includes an end head arranged at the front end of the front cylinder body and a tail end cover arranged at the rear end of the rear cylinder body, the tail end cover is provided with an air hole I connected to the rear cylinder body, the middle end cover is provided with an air hole II connected to the rear cylinder body and an air hole III connected to the front cylinder body, and the end head is provided with an air hole IV connected to the front cylinder body.

[0008] In addition, it is particularly preferred that the support rod includes a front support rod and a rear support rod that are plug-fitted, the cavity radii of the front support rod and the rear support rod are different, and a boss is formed at the connection between the two, and the boss is used to limit the stroke of the rear piston rod.

[0009] In addition, it is particularly preferred that a front end outer wall of the front support rod and a rear end inner wall of the rear support rod are respectively circumferentially provided with sealing grooves, and sealing members are arranged in the sealing grooves.

[0010] Furthermore, it is particularly preferred that the length of the support rod is greater than the length of the front cylinder cavity.

[0011] Furthermore, it is particularly preferred that the front end of the front piston rod is sealed and connected to a rod head.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The booster cylinder of the present invention realizes the variability of the oil path cavity volume through the sealed active connection between the front piston rod and the support rod, and the adjustment of the rear piston rod, so that the oil is automatically supplied or withdrawn under the action of the internal and external pressure difference, and the pressure of the front piston rod is effectively increased by the extrusion of hydraulic oil. The present invention not only simplifies the system structure and reduces energy consumption, but also significantly improves the response speed and pressure output of the cylinder.

[0014] 2. The present invention realizes precise control and efficient flow of hydraulic oil by providing a circular hole in the middle of the middle end cover for allowing the support rod to pass through, opening an annular groove on the side wall of the circular hole, and opening a second channel on the support rod. This makes the hydraulic oil flow in and out more smoothly, reduces energy loss, and improves the overall efficiency and response speed of the booster cylinder.

[0015] 3. The present invention adopts plug-in-matched front and rear support rods and forms a boss at the connection, which effectively limits the stroke of the rear piston rod, thus helping to accurately control the movement range of the piston rod.

[0016] 4. The sealing performance of the support rod is enhanced by setting sealing grooves at the front and rear ends of the support rod and embedding seals. This design reduces the leakage of hydraulic oil, ensures the airtightness of the oil channel cavity, and thus improves the working efficiency and pressure stability of the booster cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a longitudinal sectional view of the front and rear cylinder bodies of the present invention.

[0019] Figure 3 It is a longitudinal sectional view of the overall structure of the present invention.

[0020] Figure 4 For the present invention Figure 3 A is an enlarged view of the middle image.

[0021] Figure 5 It is a partial cross-sectional view of the end of the present invention.

[0022] Figure 6 It is a partial cross-sectional view of the intermediate end cover of the present invention, wherein a and b indicate two opposite surfaces of the intermediate end cover.

[0023] Figure 7 It is a partial cross-sectional view of the tail end cover of the present invention.

[0024] Among them, the above-mentioned drawings include the following figure marks: 1. front cylinder body, 2. rear cylinder body, 3. middle end cover, 4. front piston, 5. front piston rod, 61, 62, support rod, 7. rear piston, 8. rear piston rod, 91, 92, oil circuit cavity, 10. second channel, 11. round hole, 12. annular groove, 13. first channel, 14. end, 15. tail end cover, 16. air hole I, 17. air hole II, 18. air hole III, 19. air hole IV, 20. boss, 211, 212, sealing groove, 24, rod head. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0026] A traditional cylinder basically includes a cylinder body, a piston arranged in the cylinder body, and a piston rod installed on the piston. A three-position five-way valve is used to control the gas to enter or exit the cylinder body, thereby driving the piston rod to extend and retract. However, the pressure of this single cylinder is relatively low and its applicable working range is relatively narrow.

[0027] like Figure 1-3The booster cylinder of the present invention is shown, which includes a front cylinder body 1 and a rear cylinder body 2, which are fixedly connected by an intermediate end cover 3. The front cylinder body 1 is a main cylinder body, and the rear cylinder body 2 is a booster cylinder body. Unlike the traditional cylinder, the booster cylinder has a support rod 61, 62 added in the front cylinder body 1. Specifically, a front piston 4, a front piston rod 5 and support rods 61, 62 are arranged in the front cylinder body 1, and a rear piston 7 and a rear piston 8 are arranged in the rear cylinder body 2. The front piston 4, the front piston rod 5, the rear piston 7, the rear piston rod 8 and the support rod 61, 62 are coaxially arranged, the front piston 4 and the front piston rod 5 are hollow structures, the support rods 61 and 62 are placed in the front piston rod 5 to form a closed space (oil path chambers 91 and 92), and the closed space formed with the support rods 61 and 62 is filled with liquid medium (oil) when the front piston 4 moves back and forth. The size of the space changes when the front piston 4 moves. When the front piston 4 stops moving, the pressure in the closed space can be changed by the movement of the rear piston 7 to achieve a pressurization effect, and the pressure is transmitted to the front piston rod 5 through the support rods 61 and 62.

[0028] Specifically, the middle parts of the support rods 61, 62 and the front piston rod 5 are respectively provided with cavities opened along the length direction, and the front piston rod 5 and the support rods 61, 62 are connected in a sealed manner. Specifically, the front piston rod 5 is sealed and sleeved on the support rods 61, 62, and the cavities of the support rods 61, 62 are connected with the cavities of the front piston rod 5 to form closed oil path cavities 91, 92; both ends of the oil path cavities 91, 92 are sealed, and one end of the oil path cavities 91, 92 can be connected with the oil supply end through the oil path channel. With the relative movement of the two, that is, the extension or retraction of the front piston rod 5, the volume of the oil path cavities 91, 92 can be changed, specifically, when the front piston rod 5 is extended, the volume of the oil path cavities 91, 92 increases, and when the front piston rod 5 is retracted, the volume of the oil path cavities 91, 92 decreases. The increase and decrease of the volume changes the pressure in the oil path cavities 91, 92.

[0029] In addition, the rear end sealed sleeves of the support rods 61 and 62 are mounted on the rear piston rod 8, and the rear end outer walls of the support rods 61 and 62 are sealed and connected to the middle end cover 3. The relative movement of the rear piston rod 8 and the support rods 61 and 62 can also change the volume of the oil passage chambers 91 and 92. As the rear piston rod 8 extends forward, the volume of the oil passage chambers 91 and 92 decreases, and when the rear piston rod 8 retracts, the volume of the oil passage chambers 91 and 92 increases. In addition, it should be noted that the movement of the rear piston rod 8 can close or open the oil passage.

[0030] In a specific embodiment, Figure 3 , Figure 4 and Figure 6 The structure of the oil passage and the structure of the rear piston rod 8 closing or opening the oil passage are shown, which specifically include:

[0031] A circular hole 11 is provided in the middle of the intermediate end cover 3 to allow the support rods 61 and 62 to pass through, and a radially concave annular groove 12 is provided on the side wall of the circular hole 11;

[0032] The oil passageway specifically includes a first passageway 13 and a plurality of second passageways 10, wherein the first passageway 13 radially penetrates the side wall of the middle end cover 3 and the annular groove 12, and the plurality of second passageways 10 are circumferentially arranged on the side walls of the support rods 61 and 62 and connect the cavities of the support rods 61 and 62 and the annular groove 12. The oil is connected from the oil supply end and enters the oil passage cavities 91 and 92 through the first passageway 13 and the second passageway 10.

[0033] The liquid-gas boosting process of the boosting cylinder is as follows: start the boosting cylinder, and as air is taken in into the front cylinder body 1, the front piston rod 5 is driven to extend. At this time, the volume of the oil circuit chambers 91 and 92 increases, and a pressure difference is formed between the pressure in the chambers and the pressure at the oil supply end. The oil is sucked into the oil circuit chambers 91 and 92 from the second channel 10. Subsequently, the boosting part is started, that is, air is taken in into the rear cylinder body 2, driving the rear piston rod 8 to extend forward, compressing the volume of the oil circuit chambers 91 and 92, and squeezing the oil, thereby further increasing the output pressure of the front piston rod 5.

[0034] It is particularly important to note that the forward extension of the rear piston rod 8 will close the second channel 10 and cut off the oil supply channel, and the backward retraction of the rear piston rod 8 will open the second channel 10. As the rear piston rod 8 retracts backward to open the second channel 10, the front piston rod 5 retracts again to pump the oil back to the oil supply end along the second channel 10.

[0035] As a further preference, the oil supply end is provided with a solenoid valve for assisting oil inlet.

[0036] refer to Figure 1 and Figure 5-7 The boost cylinder further includes an end head 14 and a tail end cover 15, wherein the end head 14 is arranged at the front end of the front cylinder body 1, and the tail end cover 15 is arranged at the rear end of the rear cylinder body 2, wherein the end head 14 is provided with an air hole IV 19 connected to the front cylinder body 1, the middle end cover 3 is provided with an air hole II 17 connected to the rear cylinder body 2 and an air hole III 18 connected to the front cylinder body 1, and the tail end cover 15 is provided with an air hole I 16 connected to the rear cylinder body 2, and the air supply and exhaust of the front cylinder body 1 and the rear cylinder body 2 are realized through the air hole I 16, the air hole II 17, the air hole III 18 and the air hole IV 19.

[0037] Furthermore, Figure 3 As shown, the support rods 61, 62 include a front support rod 62 and a rear support rod 61 that are plug-fitted together. The cavity radii of the front support rod 62 and the rear support rod 61 are different, and a boss 20 is formed at the connection between the two, and the boss 20 is used to limit the stroke of the rear piston 7 rod.

[0038] A sealing groove 211 is circumferentially provided on the outer wall of the front end of the front support rod 62, and a sealing groove 212 is circumferentially provided on the inner wall of the rear end of the rear support rod 61. Seals are respectively provided in the sealing grooves 211 and 212.

[0039] In addition, as a further preferred solution, the overall length of the support rods 61, 62 is greater than the length of the cavity of the front cylinder body 1. This arrangement maximizes the volume difference between the oil passage cavities 91, 92 and the increased pressure.

[0040] like Figure 1 As shown, the front end of the front piston rod 5 is sealed and connected with a rod head 24. The rod head 24 and the front end of the front piston rod 5 can be threadedly connected, and when the oil passage chambers 91 and 92 need to be vented or maintained, the rod head 24 can be loosened or removed.

[0041] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A supercharged cylinder, characterized in that: It comprises a front cylinder body (1, 2) connected by an intermediate end cover (3), wherein the front cylinder body (1) is provided with a front piston (4), a support rod (61, 62) and a front piston rod (5), and the rear cylinder body (2) is provided with a rear piston (7) and a rear piston rod (8), and the support rod (61, 62), the front piston (4), the front piston rod (5), the rear piston (7) and the rear piston rod (8) are coaxially arranged; The middle parts of the support rods (61, 62) and the front piston rod (8) are respectively provided with cavities opened along the length direction, and the cavities of the support rods (61, 62) are connected with the cavities of the front piston rod (8) to form closed oil path cavities (91, 92); the front piston rod (8) and the support rods (61, 62) are connected in a sealed movable manner, and the volume of the oil path cavities (91, 92) can be changed as the two move relative to each other; The tail end of the support rod (61, 62) is sealed and movable sleeved on the rear piston rod (8), and the outer wall of the tail end is sealedly connected to the middle end cover (3). The relative movement of the rear piston rod (8) and the support rod (61, 62) can change the volume of the oil path cavity (91, 92); It also includes an oil passage connecting the oil passage chamber (91, 92) and the oil supply end, and the movement of the rear piston rod (8) can close or open the oil passage.

2. The boost cylinder according to claim 1, characterized in that: A circular hole (11) is provided in the middle of the intermediate end cover (3) to allow the support rod (61, 62) to pass through, and a radially recessed annular groove (12) is provided on the side wall of the circular hole (11). The oil passage comprises a first passage (13) radially penetrating the side wall of the intermediate end cover (3) and the annular groove (12), and a plurality of second passages (10) circumferentially arranged on the side wall of the support rod (61, 62) to connect the support rod (61, 62) cavity and the annular groove (12).

3. The boost cylinder according to claim 1, characterized in that: The invention also comprises an end cap (14) arranged at the front end of the front cylinder body (1) and a rear end cover (15) arranged at the rear end of the rear cylinder body (2); the rear end cover (15) is provided with an air hole I (16) connected to the rear cylinder body (2); the intermediate end cover (3) is provided with an air hole II (17) connected to the rear cylinder body (2) and an air hole III (18) connected to the front cylinder body (1); the end cap (14) is provided with an air hole IV (19) connected to the front cylinder body (1).

4. The boost cylinder according to claim 1, characterized in that: The support rods (61, 62) include a front support rod (62) and a rear support rod (61) that are plug-fitted together. The cavity radii of the front support rod (62) and the rear support rod (61) are different, and a boss (20) is formed at the connection between the two. The boss (20) is used to limit the travel of the rear piston rod (8).

5. The boost cylinder according to claim 4, characterized in that: The front end outer wall of the front support rod (62) and the rear end inner wall of the rear support rod (61) are respectively provided with sealing grooves (211, 212) in the circumferential direction, and sealing members are arranged in the sealing grooves (211, 212).

6. The boost cylinder according to claim 1, characterized in that: The length of the support rods (61, 62) is greater than the length of the cavity of the front cylinder body (1).

7. The boost cylinder according to any one of claims 1 to 6, characterized in that: The front end of the front piston rod (5) is sealed and connected to a rod head (24).

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