阅读说明：本技术 一种有效行程可调气缸及行程调节方法 (Effective stroke adjustable cylinder and stroke adjusting method ) 是由 宋维静 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种有效行程可调气缸,包括第二活塞和第二塞杆,第一塞杆内设有内螺纹,第二活塞设于气缸本体内并位于后端盖与第一活塞之间,第二塞杆设于第一塞杆内,并且第二塞杆与第二活塞的中部固定连接,第二塞杆的外壁设有与内螺纹配合的外螺纹,第二塞杆内设有排气通道。本发明通过将第二塞杆螺纹连接在第一塞杆内,并设置第二塞杆的一端连接第二活塞,通过旋拧第二塞杆调节第二塞杆与第一塞杆之间的间距,使第二活塞与后端盖之间形成的后腔室容积改变,从而实现气缸的有效行程可调,节约压缩空气的同时也提高气缸的响应速度；重要的是,在第二活塞与后端盖之间无塞杆部件,使第二活塞的有效面积更大,气缸输出力更大,效率更高。(The invention discloses an effective stroke adjustable cylinder which comprises a second piston and a second piston rod, wherein an internal thread is arranged in the first piston rod, the second piston is arranged in a cylinder body and positioned between a rear end cover and the first piston, the second piston rod is arranged in the first piston rod and fixedly connected with the middle part of the second piston, an external thread matched with the internal thread is arranged on the outer wall of the second piston rod, and an exhaust channel is arranged in the second piston rod. According to the invention, the second plug rod is in threaded connection with the first plug rod, one end of the second plug rod is connected with the second piston, and the distance between the second plug rod and the first plug rod is adjusted by screwing the second plug rod, so that the volume of a rear cavity formed between the second piston and the rear end cover is changed, the effective stroke of the cylinder is adjustable, compressed air is saved, and the response speed of the cylinder is improved; importantly, a part of the plug rod is not arranged between the second piston and the rear end cover, so that the effective area of the second piston is larger, the output force of the cylinder is larger, and the efficiency is higher.)

1. The utility model provides an effective stroke adjustable cylinder which characterized in that: the method is characterized in that: the method is characterized in that: the air cylinder comprises an air cylinder body (1), a front end cover (2), a rear end cover (3), a first piston (4) and a first plug rod (5), wherein the front end cover (2) is in sealing fit with the front end of the air cylinder body (1), the rear end cover (3) is in sealing fit with the rear end of the air cylinder body (1), the first piston (4) is arranged in the air cylinder body (1), one end of the first plug rod (5) penetrates through the front end cover (2) and then extends into the air cylinder body (1) and is fixedly connected with the middle of the first piston (4), the first plug rod (5) is in sealing fit with the front end cover (2), and the front end cover (2) and the rear end cover (3) are provided with air holes communicated with the inside of the air cylinder body (1); characterized in that the device also comprises a second piston (6) and a second plug rod (7), the first plug rod (5) is hollow and provided with internal threads, the second piston (6) is arranged in the cylinder body (1) and is positioned between the rear end cover (3) and the first piston (4), the second plug rod (7) is arranged in the first plug rod (5), and one end of the second plug rod (7) close to the rear end cover (3) extends out and then is fixedly connected with the middle part of the second piston (6), the outer wall of the second plug rod (7) is provided with an external thread matched with the internal thread, an exhaust channel (71) is arranged in the second plug rod (7), the exhaust passage (71) communicating a chamber formed between the first piston (4) and the second piston (6) with the outside, the other end of the second plug rod (7) is provided with a notch for screwing the second plug rod (7).

2. An active stroke adjustable cylinder according to claim 1, characterized in that the end of the first plug rod (5) close to the front end cover (2) is provided with a backstop screw (8), and the backstop screw (8) is used for preventing the first plug rod (5) and the second plug rod (7) from moving mutually.

3. An active stroke adjustable cylinder according to claim 1, characterized in that more than two tie rods (9) are connected between the front end cover (2) and the rear end cover (3).

4. An active stroke adjustable cylinder according to claim 1, characterized in that more than two tie rods (9) are connected between the front end cover (2) and the rear end cover (3).

5. An active stroke adjustable cylinder according to claim 1, characterized in that more than two tie rods (9) are connected between the front end cover (2) and the rear end cover (3).

6. A stroke adjusting method using the cylinder comprises the following steps: the method is characterized in that: an external screwing tool is used for screwing the second plug rod 7 through the notch of the second plug rod 7, so that the second plug rod 7 drives the second piston 6 to move relative to the first piston 4, the distance between the first piston 4 and the second piston 6 is adjusted, the volume of a rear cavity formed between the second piston 6 and the rear end cover 3 is changed, the first piston 4 and the second piston 6 simultaneously keep reciprocating motion during working, and the effective stroke of the first plug rod 5 is changed due to the change of the volume of the rear cavity, so that the purpose of changing the effective stroke of the cylinder is achieved;

the second plug rod 7 is connected in the first plug rod 5 in a threaded mode, one end of the second plug rod 7 is connected with the second piston 6, the second plug rod 7 is screwed to adjust the distance between the second plug rod 7 and the first plug rod 5, and the volume of a rear cavity formed between the second piston 6 and the rear end cover 3 is changed, so that the effective stroke of the cylinder can be adjusted, compressed air is saved, and the response speed of the cylinder is improved; importantly, a plug rod component is not arranged between the second piston 6 and the rear end cover 3, so that the effective area of the second piston 6 is larger, and according to the Pascal theorem F = P S, the cylinder has larger output force, higher efficiency and wider application range; in addition, locate second cock stem 7 in first cock stem 5, do not occupy the exterior space, the whole size of cylinder is compacter, adopts the screw thread mode of regulation, and it is more convenient to adjust, can realize infinitely variable control.

Technical Field

The invention relates to the technical field of cylinders, in particular to a cylinder with an adjustable effective stroke.

Background

Disclosure of Invention

The invention aims to overcome the defects and provide an effective stroke adjustable cylinder.

In order to achieve the purpose, the invention adopts the following specific scheme:

an effective stroke adjustable cylinder comprises a cylinder body, a front end cover, a rear end cover, a first piston and a first plug rod, wherein the front end cover is matched at the front end of the cylinder body in a sealing manner, the rear end cover is matched at the rear end of the cylinder body in a sealing manner, the first piston is arranged in the cylinder body, one end of the first plug rod penetrates through the front end cover and then extends into the cylinder body and is fixedly connected with the middle part of the first piston, the first plug rod is matched with the front end cover in a sealing manner, and the front end cover and the rear end cover are both provided with air holes communicated with the inside of the cylinder body; still include second piston and second cock stem, cavity sets up and is equipped with the internal thread in the first cock stem, the second piston is located this internal and be located between rear end cap and the first piston of cylinder, the second cock stem is located in the first cock stem to the second cock stem is close to the one end of rear end cap and stretches out the middle part fixed connection of back and second piston, the outer wall of second cock stem be equipped with interior screw-thread fit's external screw thread, be equipped with exhaust passage in the second cock stem, exhaust passage communicates the cavity and the external world that form between with first piston and the second piston, the other end tip of second cock stem is equipped with the notch that is used for revolving the second cock stem soon.

The first plug rod is provided with a front end cover, the front end cover is provided with a first plug rod, the first plug rod is provided with a second plug rod, and the front end cover is provided with a front end cover.

More than two pull rods are connected between the front end cover and the rear end cover.

The invention has the beneficial effects that: compared with the prior art, the second piston rod is connected in the first piston rod in a threaded manner, one end of the second piston rod is connected with the second piston, and the distance between the second piston rod and the first piston rod is adjusted by screwing the second piston rod, so that the volume of a rear cavity formed between the second piston and the rear end cover is changed, the effective stroke of the cylinder is adjustable, compressed air is saved, and the response speed of the cylinder is improved; importantly, a plug rod component is not arranged between the second piston and the rear end cover, so that the effective area of the second piston is larger, the output force of the cylinder is larger according to the Pascal theorem, the efficiency is higher, and the application range is wider; in addition, locate the second cock stem in the first cock stem, do not occupy the exterior space, the whole size of cylinder is compacter, adopts the screw thread mode of regulation, and it is more convenient to adjust, can realize infinitely variable control.

Drawings

FIG. 1 is a perspective view of an active stroke adjustable cylinder provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an active stroke adjustable cylinder provided by an embodiment of the present invention;

description of reference numerals: 1-a cylinder body; 2-front end cover; 3-rear end cap; 4-a first piston; 5-a first stopper rod; 6-a second piston; 7-a second stopper rod; 71-an exhaust channel; 8-stop screw; 9-a pull rod; 10-end face sealing ring; 11-a shaft seal ring; 12-dust ring.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention.

As shown in fig. 1 to 2, the cylinder with adjustable effective stroke according to the present embodiment includes a cylinder body 1, a front end cap 2, a rear end cap 3, a first piston 4 and a first plug rod 5, the front end cover 2 is hermetically fitted at the front end of the cylinder body 1, and the rear end cover 3 is hermetically fitted at the rear end of the cylinder body 1, specifically, the front end cover 2 and the rear end cover 3 are respectively sleeved with an end face sealing ring 10, so that a large cavity is formed in the cylinder body 1, the first piston 4 is arranged in the cylinder body 1, one end of the first plug rod 5 penetrates through the front end cover 2 and then extends into the cylinder body 1 and is fixedly connected with the middle part of the first piston 4, the first plug rod 5 is in sealing fit with the front end cover 2, specifically, the front end cover 2 is nested with a shaft sealing ring 11, and the front end cover 2 and the rear end cover 3 are both provided with air holes communicated with the interior of the cylinder body 1; the piston is characterized by further comprising a second piston 6 and a second plug rod 7, wherein an internal thread is arranged in the first plug rod 5 in a hollow mode, the second piston 6 is arranged in the cylinder body 1 and located between the rear end cover 3 and the first piston 4, the second plug rod 7 is arranged in the first plug rod 5, one end, close to the rear end cover 3, of the second plug rod 7 extends out and then is fixedly connected with the middle of the second piston 6, an external thread matched with the internal thread is arranged on the outer wall of the second plug rod 7, an exhaust channel 71 is arranged in the second plug rod 7, a cavity formed between the first piston 4 and the second piston 6 is communicated with the outside through the exhaust channel 71, so that when the second plug rod 7 is screwed, the second piston 6 can move relative to the first piston 4, a notch used for screwing the second plug rod 7 is arranged at the end of the second plug rod 7, and a threaded connection portion can be arranged at the other end of the first plug rod 5, for connection to an external load.

During the use, utilize external rotatory instrument of twisting to twist second cock stem 7 through the notch of second cock stem 7, make second cock stem 7 drive second piston 6 and remove relative first piston 4, adjust the interval between first piston 4 and the second piston 6, thereby change the back cavity volume that forms between second piston 6 and the rear end cap 3, during operation, first piston 4 and second piston 6 keep reciprocating motion simultaneously, because of the change of back cavity volume, thereby changed the effective stroke of first cock stem 5, reach the purpose that changes the effective stroke of cylinder.

In the embodiment, the second plug rod 7 is in threaded connection with the first plug rod 5, one end of the second plug rod 7 is connected with the second piston 6, and the second plug rod 7 is screwed to adjust the distance between the second plug rod 7 and the first plug rod 5, so that the volume of a rear cavity formed between the second piston 6 and the rear end cover 3 is changed, the effective stroke of the cylinder is adjustable, compressed air is saved, and the response speed of the cylinder is improved; importantly, a plug rod component is not arranged between the second piston 6 and the rear end cover 3, so that the effective area of the second piston 6 is larger, and according to the Pascal theorem F = P S, the cylinder has larger output force, higher efficiency and wider application range; in addition, locate second cock stem 7 in first cock stem 5, do not occupy the exterior space, the whole size of cylinder is compacter, adopts the screw thread mode of regulation, and it is more convenient to adjust, can realize infinitely variable control.

As shown in fig. 2, based on the above embodiment, further, a retaining screw 8 is disposed at one end of the first plug rod 5 close to the front end cap 2, and the retaining screw 8 is used for preventing the first plug rod 5 and the second plug rod 7 from moving relative to each other.

As shown in fig. 1, based on the above embodiment, more than two tie rods 9 are further connected between the front end cover 2 and the rear end cover 3, so that the front end cover 2 and the cylinder body 1 and the rear end cover 3 and the cylinder body 1 are more firmly connected, and specifically, four tie rods 9 are connected between the front end cover 2 and the rear end cover 3 at intervals.

As shown in fig. 2, in this embodiment, the front end cap 2 is sleeved with a dust ring 12 that is engaged with the first plug rod 5, so that the structure is more reliable.

The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the protection scope of the present patent application.