Hydraulic cylinder with multi-stage stroke adjusting function

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a multi-stage stroke adjusting function. According to the technical scheme, the hydraulic cylinder comprises a cylinder body and a first-stage hydraulic cavity formed in the cylinder body, a sliding column is installed in the first-stage hydraulic cavity in a sliding mode, a sliding block is installed in the sliding column in a sliding mode, an output shaft penetrating through one end of the sliding column is fixedly installed on the sliding block, the hydraulic cylinder further comprises a storage bin fixedly installed on the cylinder body, and a sealing block is installed in the storage bin in a sliding mode. The storage bin communicates with the first-stage hydraulic cavity, and the sum of the sectional area of the sealing block and the sectional area of the sliding block is equal to the sectional area of the bottom of the sliding column. The multi-stage telescopic cylinder is not affected by pipe diameters of different stages, the speed difference during stage changing is avoided, and the problems of positioning precision reduction, mechanical damage and system reliability reduction possibly caused by sudden change of the stage changing speed are solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a hydraulic cylinder with multi-stage stroke adjustment function. Background Technology

[0002] A hydraulic cylinder with multi-stage stroke adjustment is a hydraulic actuator that can adapt to different working conditions by adjusting the extension length of the piston rod. Its core lies in achieving segmented or continuous stroke adjustment through mechanical, hydraulic, or electronic control methods, thereby expanding the application flexibility of the hydraulic cylinder.

[0003] However, due to the different pipe diameters of different stages, multi-stage telescopic cylinders will have different speeds when switching stages. Multi-stage hydraulic cylinders have shown advantages of high space efficiency and strong dynamic adaptability in engineering, agriculture, and industrial scenarios, but sudden changes in their switching speed may lead to a decrease in positioning accuracy, mechanical damage and reduced system reliability. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a hydraulic cylinder with multi-stage stroke adjustment function.

[0005] The technical solution of this utility model: A hydraulic cylinder with multi-stage stroke adjustment function, comprising a cylinder body and a primary hydraulic chamber disposed within the cylinder body, wherein a sliding column is slidably mounted in the primary hydraulic chamber, a slider is slidably mounted in the sliding column, and an output shaft passing through one end of the sliding column is fixedly mounted on the slider, and further comprising:

[0006] A storage compartment is fixedly installed on the cylinder body, and a sealing block is slidably installed inside the storage compartment. The storage compartment is connected to the first-stage hydraulic chamber, and the sum of the cross-sectional areas of the sealing block and the slider is equal to the cross-sectional area of ​​the bottom of the sliding column.

[0007] A valve that is fixedly installed between the storage compartment and the primary hydraulic chamber;

[0008] The starting mechanism opens the valve after the slide column slides to its limit position and closes the valve after the slide column leaves the limit position.

[0009] Optionally, the cylinder body is provided with a limiting block to limit the sliding column, the starting mechanism includes a hydraulic chamber provided on the limiting block, a sealing block is slidably installed in the hydraulic chamber, a detection rod is fixedly installed on the sealing block, the detection rod extends into the first-stage hydraulic chamber, and a first connecting hole is provided on both sides of the hydraulic chamber.

[0010] Optionally, the starting mechanism further includes a drive cylinder rotatably mounted on the storage compartment. A sealing plate is slidably mounted inside the drive cylinder. A transmission rod passing through one end of the drive cylinder is fixedly mounted on the sealing plate. Both ends of the drive cylinder are provided with second connecting holes. The first connecting hole and the second connecting hole correspond one-to-one and are connected through an oil pipe. A first spring is fixedly mounted between the sealing plate and the drive cylinder.

[0011] Optionally, a second spring is fixedly installed inside the storage compartment, and the other end of the second spring is fixedly connected to the sealing block.

[0012] Optionally, the valve includes a valve body, a valve core rotatably mounted inside the valve body, and a support shaft fixedly mounted on the valve core and passing through one side of the valve body, wherein the transmission rod is fixedly connected to the support shaft.

[0013] Optionally, a plurality of first sealing rings are fixedly installed on the slide column, the slide column is provided with a sliding groove, and the bottom of the slide column is provided with an oil hole communicating with the sliding groove.

[0014] Optionally, a plurality of second sealing rings are fixedly installed on the slider, and a return hole is provided on the slide column. One end of the return hole is connected to the slide groove, and the other end is connected to the primary hydraulic chamber.

[0015] Optionally, the cylinder body is provided with a first oil port and a second oil port at both ends, and both the first oil port and the second oil port are connected to the first-stage hydraulic chamber.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] This invention, through the design of the storage chamber, valves, and starting mechanism, ensures that the multi-stage telescopic cylinder is not affected by different pipe diameters, avoids speed differences during stage switching, and prevents sudden changes in stage switching speed from causing problems such as decreased positioning accuracy, mechanical damage, and reduced system reliability. Attached Figure Description

[0018] Figure 1 Schematic diagram of hydraulic cylinder structure Figure 1 ;

[0019] Figure 2 Schematic diagram of hydraulic cylinder structure Figure 2 ;

[0020] Figure 3 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the valve structure;

[0022] Figure 5 This is a diagram showing the location of the valve.

[0023] Reference numerals: 1. Cylinder body; 101. Primary hydraulic chamber; 102. First oil port; 103. Second oil port; 104. Limiting block; 2. Sliding column; 201. First sealing ring; 202. Oil hole; 203. Sliding groove; 3. Sliding block; 301. Second sealing ring; 4. Output shaft; 5. Return hole; 6. Storage chamber; 601. Sealing block; 602. Second spring; 603. Valve; 6031. Valve body; 6032. Valve core; 6033. Support shaft; 7. Hydraulic chamber; 701. Sealing block; 702. Detection rod; 703. First connecting hole; 704. Drive cylinder; 705. Sealing plate; 706. Transmission rod; 707. Second connecting hole; 708. Oil pipe; 709. First spring. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 and Figure 2 As shown, this utility model proposes a hydraulic cylinder with multi-stage stroke adjustment function, including a cylinder body 1 and a primary hydraulic chamber 101 disposed within the cylinder body 1. A slide column 2 is slidably installed in the primary hydraulic chamber 101, and multiple first sealing rings 201 are fixedly installed on the slide column 2. A slide groove 203 is provided inside the slide column 2, and an oil hole 202 communicating with the slide groove 203 is provided at the bottom of the slide column 2. The hydraulic oil entering the primary hydraulic chamber 101 first pushes the slide column 2 to move. After the slide column 2 moves to its limit position, the hydraulic oil will enter the slide groove 203 through the oil hole 202 under the action of oil pressure. A slider 3 is slidably installed in the slide column 2, and multiple second sealing rings 301 are fixedly installed on the slider 3. A return hole 5 is provided on the slide column 2 for return. One end of the hole 5 is connected to the slide groove 203, and the other end is connected to the primary hydraulic chamber 101. When hydraulic oil enters the slide groove 203, it will push the slider 3 to move, and the hydraulic oil on the other side of the slider 3 will flow out through the return hole 5. An output shaft 4 that passes through one end of the slide column 2 is fixedly installed on the slider 3. The movement of the slider 3 can drive the output shaft 4 to move, so that the object connected to the output shaft 4 can be moved through the output shaft 4. The two ends of the cylinder body 1 are respectively provided with a first oil port 102 and a second oil port 103. The first oil port 102 and the second oil port 103 are both connected to the primary hydraulic chamber 101. Hydraulic oil can enter or leave the two ends of the primary hydraulic chamber 101 through the first oil port 102 and the second oil port 103.

[0026] like Figures 1 to 5As shown, this embodiment also includes a storage chamber 6 fixedly installed on the cylinder body 1. A sealing block 601 is slidably installed inside the storage chamber 6. The storage chamber 6 is connected to the primary hydraulic chamber 101. When the slide column 2 moves to its limit position, and the hydraulic oil begins to push the slider 3 to move, some hydraulic oil will enter the storage chamber 6, and another part will enter the slide groove 203. Since the sum of the cross-sectional areas of the sealing block 601 and the slider 3 is equal to the cross-sectional area of ​​the bottom of the slide column 2, the speed of the slider 3 when it moves can be kept consistent with the speed of the slide column 2 when it moves, thereby preventing sudden speed changes when the hydraulic cylinder extends and retracts. It also includes a valve 603 fixedly installed between the storage chamber 6 and the primary hydraulic chamber 101. By controlling the opening and closing of the valve 603, the hydraulic oil can be controlled to enter the storage chamber 6. Inside compartment 6, the timing of hydraulic oil entering the storage compartment 6 can be controlled by controlling the opening timing of valve 603. This allows the hydraulic oil to enter the storage compartment 6 simultaneously with pushing slider 3. A second spring 602 is fixedly installed inside the storage compartment 6, with the other end of the second spring 602 fixedly connected to sealing block 601. The second spring 602 can simulate the resistance encountered when output shaft 4 moves outward and can reset the position of sealing block 601. It can also directly connect the first sealing block 601 and output shaft 4, and this connecting shaft can extend and retract with the movement of sliding column 2. This ensures that the movement of sliding column 2 will not affect the first sealing block 601 again. At this time, the second spring 602 can be removed, so that the first sealing block 601 and output shaft 4 are subjected to the same amount of pressure.

[0027] The valve 603 includes a valve body 6031, a valve core 6032 rotatably mounted inside the valve body 6031, and a support shaft 6033 fixedly mounted on the valve core 6032 and passing through one side of the valve body 6031. The transmission rod 706 is fixedly connected to the support shaft 6033. By rotating the support shaft 6033, the valve core 6032 can be driven to rotate. The rotating valve core 6032 can control the open / closed state on both sides of the valve body 6031.

[0028] like Figures 3 to 4 As shown, this embodiment also includes a starting mechanism. The starting mechanism opens the valve 603 after the slide column 2 slides to the limit position and closes the valve 603 after the slide column 2 leaves the limit position. The cylinder body 1 is provided with a limiting block 104 to limit the slide column 2. The starting mechanism includes a hydraulic chamber 7 provided on the limiting block 104. A sealing block 701 is slidably installed in the hydraulic chamber 7. A detection rod 702 is fixedly installed on the sealing block 701. The detection rod 702 extends into the first-stage hydraulic chamber 101. First connecting holes 703 are provided on both sides of the hydraulic chamber 7. When the slide column 2 moves to the limit position, it will drive the detection rod 702 to move, and the hydraulic medium inside the hydraulic chamber 7 can be squeezed out through the sealing block 701.

[0029] Furthermore, the starting mechanism also includes a drive cylinder 704 rotatably mounted on the storage compartment 6. A sealing plate 705 is slidably mounted inside the drive cylinder 704. A transmission rod 706 passing through one end of the drive cylinder 704 is fixedly mounted on the sealing plate 705. Both ends of the drive cylinder 704 are provided with second connection holes 707. The first connection hole 703 and the second connection hole 707 correspond one-to-one and are connected through an oil pipe 708. A first spring 709 is fixedly mounted between the sealing plate 705 and the drive cylinder 704. When the hydraulic medium inside the hydraulic compartment 7 is forced out, the hydraulic medium will enter the drive cylinder 704 through the oil pipe 708 and drive the sealing plate 705 to move. This will drive the valve core 6032 to rotate through the transmission rod 706, thereby opening the valve 603 when the slider 3 starts to move.

[0030] In this embodiment, when the slide column 2 moves to its limit position, it will drive the detection rod 702 to move, and the hydraulic medium inside the hydraulic chamber 7 can be forced out through the sealing block 701. After the hydraulic medium inside the hydraulic chamber 7 is forced out, the hydraulic medium will enter the drive cylinder 704 through the oil pipe 708 and drive the sealing plate 705 to move, thereby driving the valve core 6032 to rotate through the transmission rod 706, so that the valve 603 is in the open state when the slider 3 starts to move. Since the sum of the cross-sectional areas of the sealing block 601 and the slider 3 is equal to the cross-sectional area of ​​the bottom of the slide column 2, the speed of the slider 3 can be kept consistent with the speed of the slide column 2 when it moves, thereby preventing sudden speed changes when the hydraulic cylinder extends and retracts.

[0031] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A hydraulic cylinder with multi-stage stroke adjustment function, comprising a cylinder body (1) and a primary hydraulic chamber (101) disposed within the cylinder body (1), wherein a slide column (2) is slidably mounted within the primary hydraulic chamber (101), a slider (3) is slidably mounted within the slide column (2), and an output shaft (4) passing through one end of the slide column (2) is fixedly mounted on the slider (3), characterized in that, Also includes: A storage chamber (6) is fixedly installed on the cylinder body (1). A sealing block (601) is slidably installed in the storage chamber (6). The storage chamber (6) is connected to the first-stage hydraulic chamber (101). The sum of the cross-sectional areas of the sealing block (601) and the slider (3) is equal to the cross-sectional area of ​​the bottom of the sliding column (2). A valve (603) is fixedly installed between the storage compartment (6) and the primary hydraulic chamber (101); The starting mechanism opens the valve (603) after the slide column (2) slides to the limit position, and closes the valve (603) after the slide column (2) leaves the limit position.

2. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 1, characterized in that, The cylinder (1) is provided with a limiting block (104) for limiting the sliding column (2). The starting mechanism includes a hydraulic chamber (7) provided on the limiting block (104). A sealing block (701) is slidably installed in the hydraulic chamber (7). A detection rod (702) is fixedly installed on the sealing block (701). The detection rod (702) extends into the first-stage hydraulic chamber (101). A first connecting hole (703) is provided on both sides of the hydraulic chamber (7).

3. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 2, characterized in that, The starting mechanism also includes a drive cylinder (704) rotatably mounted on the storage compartment (6). A sealing plate (705) is slidably mounted inside the drive cylinder (704). A transmission rod (706) passing through one end of the drive cylinder (704) is fixedly mounted on the sealing plate (705). Both ends of the drive cylinder (704) are provided with second connecting holes (707). The first connecting hole (703) and the second connecting hole (707) correspond one-to-one and are connected through an oil pipe (708). A first spring (709) is fixedly mounted between the sealing plate (705) and the drive cylinder (704).

4. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 3, characterized in that, A second spring (602) is fixedly installed inside the storage compartment (6), and the other end of the second spring (602) is fixedly connected to the sealing block (601).

5. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 4, characterized in that, The valve (603) includes a valve body (6031), a valve core (6032) rotatably mounted inside the valve body (6031), and a support shaft (6033) fixedly mounted on the valve core (6032) and passing through one side of the valve body (6031). The transmission rod (706) is fixedly connected to the support shaft (6033).

6. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 5, characterized in that, Multiple first sealing rings (201) are fixedly installed on the slide column (2), and a slide groove (203) is provided inside the slide column (2). An oil hole (202) communicating with the slide groove (203) is provided at the bottom of the slide column (2).

7. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 6, characterized in that, Multiple second sealing rings (301) are fixedly installed on the slider (3), and a return hole (5) is provided on the slide column (2). One end of the return hole (5) is connected to the slide groove (203), and the other end is connected to the primary hydraulic chamber (101).

8. A hydraulic cylinder with multi-stage stroke adjustment function according to claim 7, characterized in that, The cylinder body (1) has a first oil port (102) and a second oil port (103) at both ends, and the first oil port (102) and the second oil port (103) are both connected to the first-stage hydraulic chamber (101).

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