Multi-stage variable cylinder

Abstract

The utility model discloses multistage variable cylinder relates to engineering machinery field, including first connecting block, second connecting block, third connecting block, fourth connecting block and fifth connecting block, be provided with third cylinder between first connecting block and second connecting block, be provided with second cylinder between second connecting block and third connecting block, be provided with first cylinder between fourth connecting block and fifth connecting block, second connecting block, third connecting block, fourth connecting block, fifth connecting block and first cylinder and second cylinder constitute one -level adjusting structure. The utility model discloses through setting one -level adjusting structure control second top rod's movement in first cylinder and second cylinder, two -level adjusting structure control first top rod's movement in third cylinder, realize multistage stroke adjustment, satisfy the diversification demand of cylinder telescopic distance under different scenes.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery, specifically to a multi-stage variable cylinder. Background Technology

[0002] In the fields of industrial automation and precision machinery, cylinders, as important power actuators, are widely used in machining, logistics, and intelligent equipment. With the increasing demands for flexibility and precision in modern industry, traditional fixed-stroke cylinders can no longer meet the adjustment needs of various operating conditions and dimensions. For example, in automated production lines, the same equipment often needs to push and clamp workpieces of different specifications at different distances. This requires cylinders to have the ability to flexibly adjust their extension and retraction strokes to adapt to diverse operational needs. Multi-stage variable-stroke cylinders are a new type of actuator that has emerged in this context.

[0003] Currently, some cylinders with stroke adjustment functions exist on the market. Their basic principle is to achieve limited stroke changes through air volume control of a single cylinder or mechanical limiting. Although these cylinders can change the extension and retraction distance within a certain range, they generally suffer from problems such as few adjustment levels, complex structure, or slow response speed.

[0004] In the existing technology, there are two common ways to achieve cylinder stroke adjustment: one is to set a mechanical stop outside the cylinder body; the other is to adopt a dual-cylinder series structure, and control the independent extension and retraction of the two cylinders to create different strokes.

[0005] In terms of the accuracy of stroke adjustment and airtightness control, the existing technology has obvious defects. The sealing structure of the connection between the push rod and the cylinder body of the traditional multi-stage cylinder is simple. After long-term and high-frequency adjustment, air leakage is prone to occur, which leads to a decrease in the accuracy of air volume control on both sides of the push rod, affecting the stability of the stroke. The overall operating efficiency of the equipment is often affected by response delay or stroke error. Utility Model Content

[0006] Based on this, the purpose of this utility model is to provide a multi-stage variable cylinder to solve the problems of limited stroke adjustment stages, low precision, poor airtightness and slow response in the existing technology, and to achieve the technical problem of multi-stage precise adjustment.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage variable cylinder, comprising a first connecting block, a second connecting block, a third connecting block, a fourth connecting block, and a fifth connecting block; a third cylinder body is disposed between the first and second connecting blocks; a second cylinder body is disposed between the second and third connecting blocks; and a first cylinder body is disposed between the fourth and fifth connecting blocks. The second, third, fourth, and fifth connecting blocks, the first cylinder body, and the second cylinder body constitute a primary adjustment structure. The first, second, and third connecting blocks constitute a secondary adjustment structure. A second push rod is disposed within the first cylinder body, extending through the fourth and third connecting blocks into the second cylinder body. A first push rod is disposed within the third cylinder body, passing through the first connecting block.

[0008] By adopting the above technical solution, the cylinder is multi-stage adjusted by the first cylinder block, the second connecting block, the third connecting block, the fourth connecting block, the fifth connecting block, the first cylinder block, and the second cylinder block forming a primary adjustment structure, and the first connecting block, the second connecting block, and the third cylinder block forming a secondary adjustment structure.

[0009] The present invention is further configured such that: one end of the first push rod is connected to a first top plate inside the third cylinder, the first top plate dividing the third cylinder into left and right spaces; one end of the second push rod is connected to a second top plate inside the second cylinder, the second top plate dividing the second cylinder into left and right spaces; and one end of the second push rod is connected to a third top plate inside the first cylinder, the third top plate dividing the first cylinder into left and right spaces.

[0010] By adopting the above technical solution, the cylinder is divided into two spaces, and the air volume in the two spaces is controlled to control the pushrod.

[0011] The present invention is further configured such that: a first air valve is provided on the first connecting block, the first air valve being connected to the left end of the third cylinder body; a second air valve and a third air valve are provided on the second connecting block, the second air valve being connected to the right end of the third cylinder body, and the third air valve being connected to the left end of the second cylinder body; a fourth air valve is provided on the third connecting block, the fourth air valve being connected to the right end of the second cylinder body; a fifth air valve is provided on the fourth connecting block, the fifth air valve being connected to the left end of the first cylinder body; and a sixth air valve is provided on the fifth connecting block, the sixth air valve being connected to the right end of the first cylinder body.

[0012] By adopting the above technical solution, an external air pump can be connected to control the push rod.

[0013] The present invention is further provided with sealing rings at the penetration points of the first connecting block, the second connecting block, the third connecting block and the fourth connecting block by the first push rod and the second push rod.

[0014] By adopting the above technical solution, the cylinder body is sealed.

[0015] The present invention is further configured such that a connector is connected to the other end of the first push rod, and the surface of the connector is provided with threads.

[0016] By adopting the above technical solution, the connection between the cylinder and other structures can be achieved. In summary, the present invention has the following main advantages: This utility model achieves multi-stage stroke adjustment by setting a primary adjustment structure to control the movement of the second push rod in the first and second cylinders, and a secondary adjustment structure to control the movement of the first push rod in the third cylinder, thereby meeting the diverse needs for cylinder extension and retraction distance in different scenarios. This invention controls the air volume on both sides of the cylinder top by setting corresponding air valves on each connecting block, and uses sealing rings and lubricating grease to ensure airtightness and smoothness, making the movement of the push rod precise and controllable, and improving the stability and response speed of the cylinder extension and retraction adjustment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 This is another structural diagram of the overall structure of this utility model.

[0018] In the diagram: 1. First connecting block; 2. Second connecting block; 3. Third connecting block; 4. Fourth connecting block; 5. Fifth connecting block; 6. First cylinder block; 7. Second cylinder block; 8. Third cylinder block; 9. Connector; 10. Sealing ring; 11. First push rod; 12. First push plate; 13. Second push plate; 14. Third push plate; 15. Second push rod; 16. First air valve; 17. Second air valve; 18. Third air valve; 19. Fourth air valve; 20. Fifth air valve; 21. Sixth air valve. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The embodiments of this utility model will be described below based on its overall structure.

[0021] Multi-stage variable cylinder, such as Figure 1-3 As shown, the device includes a first connecting block 1, a second connecting block 2, a third connecting block 3, a fourth connecting block 4, and a fifth connecting block 5. A third cylinder 8 is disposed between the first connecting block 1 and the second connecting block 2. A second cylinder 7 is disposed between the second connecting block 2 and the third connecting block 3. A first cylinder 6 is disposed between the fourth connecting block 4 and the fifth connecting block 5. The second connecting block 2, the third connecting block 3, the fourth connecting block 4, the fifth connecting block 5, the first cylinder 6, and the second cylinder 7 form a primary adjustment structure. The first connecting block 1, the second connecting block 2, and the third cylinder 8 form a secondary adjustment structure. Correspondingly, a second push rod 15 is provided inside the first cylinder 6. The second push rod 15 extends into the second cylinder 7 through the fourth connecting block 4 and the third connecting block 3. A first push rod 11 is provided inside the third cylinder 8. The first push rod 11 passes through the first connecting block 1. Its operating principle is as follows: the movement of the second push rod 15 is controlled by the primary adjustment structure, thereby controlling the positional relationship between the first cylinder 6 and the second cylinder 7, thereby controlling the extension distance of the cylinder, achieving the primary adjustment effect of the cylinder. Furthermore, the position of the first push rod 11 within the third cylinder 8 is controlled by the secondary adjustment structure, thereby controlling the extension distance of the third cylinder 8, achieving the secondary adjustment effect.

[0022] In conjunction with the above structure, the first push rod 11 is connected to one end of the third cylinder 8 by a first push plate 12, which divides the third cylinder 8 into left and right spaces. The second push rod 15 is connected to one end of the second cylinder 7 by a second push plate 13, which divides the second cylinder 7 into left and right spaces. The second push rod 15 is connected to one end of the first cylinder 6 by a third push plate 14, which divides the first cylinder 6 into left and right spaces. By dividing the space in each cylinder into left and right parts, the movement of the push plate in the cylinder can be controlled by controlling the air volume on both sides of the push plate in the cylinder, thereby controlling the movement of the push rod and achieving the effect of cylinder extension and retraction adjustment. Furthermore, the specific methods for adjusting the left and right air volume during top-slapping include: The first connecting block 1 is provided with a first air valve 16, which is connected to the left end of the third cylinder 8. The second connecting block 2 is provided with a second air valve 17 and a third air valve 18, which are connected to the right end of the third cylinder 8 and the left end of the second cylinder 7. The third connecting block 3 is provided with a fourth air valve 19, which is connected to the right end of the second cylinder 7. The fourth connecting block 4 is provided with a fifth air valve 20, which is connected to the left end of the first cylinder 6. The fifth connecting block 5 is provided with a sixth air valve 21, which is connected to the right end of the first cylinder 6. By providing several air valves corresponding to the left and right ends of the three cylinders respectively, the top tapping inside the cylinder can be controlled. The following is an explanation with reference to an example. For ease of explanation, the stroke of the cylinder in the example is S, the first valve 16 is represented by A, the second valve 17 by B, the first valve 18 by C, the fourth valve 19 by D, the fifth valve 20 by E, and the first valve 21 by F. Status A: Air enters through port B, and the piston rod extends for stroke S. Status A1: Air enters through port A, piston rod retraction stroke 0; State B: Air intake is through port C+B, and the piston rod extension stroke is S+S. Status B1: Air intake is through D+B hole, and the piston rod retraction stroke is S; State C: Air intake at F+C+B port, piston rod extension stroke S+S+S State C1: Air intake can be via E+C+B or F+C+B, or the piston rod retraction stroke can be S+S via A+C+F. State D: When air enters through the E+C+B port, the piston rod retracts, and the stroke becomes S+S. State D1 Air intakes through holes F+C+B, piston rod extends, stroke is S+S+S State E: Air enters through holes D+E+B, the piston rod retracts, and the stroke is S; Status E1: Air intake at B+C+E ports, piston rod extension, stroke outside S+S; State F: When air enters through holes A+D+E, the piston rod retracts, and the stroke is 0. The above examples illustrate the various variations of the cylinder in this application, thereby achieving a multi-stage variable effect. In conjunction with the above structure, sealing rings 10 are provided at the penetration points of the first connecting block 1, the second connecting block 2, the third connecting block 3 and the fourth connecting block 4 where the first push rod 11 and the second push rod 15 pass through. At the same time, an appropriate amount of lubricating grease is applied to each cylinder body to fill the gaps and cooperate with the sealing rings to ensure the airtightness of the cylinder body while ensuring the smooth operation of the cylinder.

[0023] The other end of the first push rod 11 is connected to a connector 9, and the surface of the connector 9 is provided with threads, which facilitates the connection of the connector 9 to other devices.

[0024] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A multi-stage variable cylinder, comprising a first connecting block (1), a second connecting block (2), a third connecting block (3), a fourth connecting block (4), and a fifth connecting block (5), characterized in that: A third cylinder (8) is provided between the first connecting block (1) and the second connecting block (2), a second cylinder (7) is provided between the second connecting block (2) and the third connecting block (3), and a first cylinder (6) is provided between the fourth connecting block (4) and the fifth connecting block (5). The second connecting block (2), the third connecting block (3), the fourth connecting block (4), the fifth connecting block (5), the first cylinder (6), and the second cylinder (7) form a first-level adjustment structure. The first connecting block (1), the second connecting block (2), and the third cylinder (8) form a second-level adjustment structure. A second push rod (15) is provided inside the first cylinder (6). The second push rod (15) passes through the fourth connecting block (4) and the third connecting block (3) and extends into the second cylinder (7). A first push rod (11) is provided inside the third cylinder (8). The first push rod (11) passes through the first connecting block (1).

2. The multi-stage variable cylinder according to claim 1, characterized in that: The first push rod (11) is connected to a first push plate (12) at one end inside the third cylinder (8). The first push plate (12) divides the third cylinder (8) into two spaces, left and right. The second push rod (15) is connected to a second push plate (13) at one end inside the second cylinder (7). The second push plate (13) divides the second cylinder (7) into two spaces, left and right. The second push rod (15) is connected to a third push plate (14) at one end inside the first cylinder (6). The third push plate (14) divides the first cylinder (6) into two spaces, left and right.

3. The multi-stage variable cylinder according to claim 1, characterized in that: The first connecting block (1) is provided with a first air valve (16), which is connected to the left end of the third cylinder (8). The second connecting block (2) is provided with a second air valve (17) and a third air valve (18), which is connected to the right end of the third cylinder (8) and the third air valve (18) is connected to the left end of the second cylinder (7). The third connecting block (3) is provided with a fourth air valve (19), which is connected to the right end of the second cylinder (7). The fourth connecting block (4) is provided with a fifth air valve (20), which is connected to the left end of the first cylinder (6). The fifth connecting block (5) is provided with a sixth air valve (21), which is connected to the right end of the first cylinder (6).

4. The multi-stage variable cylinder according to claim 1, characterized in that: Sealing rings (10) are provided at the penetration points of the first connecting block (1), the second connecting block (2), the third connecting block (3) and the fourth connecting block (4) by the first push rod (11) and the second push rod (15).

5. The multi-stage variable cylinder according to claim 2, characterized in that: The other end of the first push rod (11) is connected to a connector (9), and the surface of the connector (9) is provided with threads.

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