A cylinder with memory function and stroke adjustable at will and operation method thereof

Abstract

The invention discloses an oil cylinder with a memory function and an operation method thereof, wherein the oil cylinder has an adjustable stroke and comprises an adjusting piston and a piston rod assembly which can be moved left and right, and an oil port A, an oil port B and an oil port C are respectively opened on the cylinder body; a first oil passage which is respectively connected to the oil port A and the D cavity is arranged in the cylinder body sealing rod, and a second oil passage which is respectively connected to the D cavity and the E cavity is arranged in the piston rod assembly; the oil port B is connected to the G cavity; and the oil port C is connected to the F cavity. The invention can adjust the stroke of the hydraulic oil cylinder as required, and has a stroke memory function, has a simple structure, is easy to operate, is safe and reliable to control, and has low installation, use and maintenance costs, saves time, saves resources, and does not delay production operations. The invention realizes that the stroke of the oil cylinder itself is changed and adjusted by hydraulic adjustment without the need to replace a new oil cylinder, and the maximum telescopic length is changed only by hydraulic adjustment, so as to meet the purpose of demand, save the design, manufacturing and replacement costs of the new oil cylinder, and also save the equipment space transformation costs, and almost does not delay the production operation of the equipment, and has high safety and low use and maintenance costs.

Description

Technical Field

[0001] The invention relates to an oil cylinder with a memory function and an operating method thereof, and belongs to the technical field of oil cylinders. Background Art

[0002] like Figure 6 As shown, the existing conventional hydraulic cylinder has a fixed range of motion of the piston, that is, its stroke S is fixed. If you want to change the stroke S of the hydraulic cylinder to Sn, you must produce and replace a cylinder with a stroke of Sn, which greatly increases the equipment cost and time cycle. Sometimes it is also necessary to adjust the structure of the entire equipment according to the new cylinder, which is more expensive and delays the production operation of the equipment.

[0003] like Figure 7 As shown, some conventional hydraulic cylinders that can adjust the cylinder stroke have a very complex structure, requiring the manufacture and installation of complex structures such as the adjusting screw 121, the sealing cover 122, the sealing guide rod 123, and the adjusting screw head 124. In addition, to achieve the adjustment of the hydraulic cylinder stroke from 0 to S, the lengths S1 and S2 of the adjusting screw 121 and the sealing guide rod 123 must be longer than S, and the size of the entire cylinder mechanism will increase to more than three times the original length, which is bulky and costly, and has multiple connection points, which is prone to oil leakage, polluting the environment, and the maintenance cost is also very high. In addition, the screw head needs to be adjusted manually, which is also dangerous under the working conditions of high-pressure oil operation. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a cylinder with a memory function and an operating method thereof whose stroke can be adjusted arbitrarily.

[0005] The technical solution provided by the present invention is as follows: an oil cylinder with a memory function whose stroke can be adjusted arbitrarily, comprising a cylinder body, a piston rod assembly, a front cover and a sealing member, characterized in that an adjusting piston which can be moved left and right is provided in the cylinder body, a cylinder sealing rod connected to the cylinder body is placed in the piston rod assembly, the piston rod assembly can be moved left and right, an F chamber is formed between the cylinder body, the front cover, the piston rod assembly and the adjusting piston, an E chamber is formed between the cylinder body, the piston rod assembly and the adjusting piston, a G chamber is formed between the cylinder body, the piston rod assembly and the cylinder sealing rod, and a D chamber is formed between the piston rod assembly and the cylinder sealing rod; oil ports A, B and C are respectively provided on the cylinder body; a first oil passage which is respectively connected to the oil ports A and D chambers is provided in the cylinder sealing rod, a second oil passage which is respectively connected to the D chamber and E chamber is provided in the piston rod assembly; oil port B is connected to the G chamber; oil port C is connected to the F chamber.

[0006] Furthermore, a first seal is provided between the piston rod assembly and the front cover, a second seal is provided between the cylinder body and the front cover, a third seal is provided between the piston rod assembly and the adjusting piston, a fourth seal is provided between the cylinder body and the adjusting piston, a fifth seal is provided between the cylinder body and the piston rod assembly, and a sixth seal is provided between the piston rod assembly and the cylinder body sealing rod.

[0007] A method for operating an oil cylinder with a memory function and an arbitrarily adjustable stroke comprises the following steps:

[0008] 1) Open ports A, B and C at the same time, and introduce system hydraulic oil from port A. The system hydraulic oil passes through port A, the first oil passage, D chamber and the second oil passage into chamber E, pushing the piston rod assembly to the right, and the oil in chamber G is discharged from port B. The oil in chamber G is completely discharged, and the piston rod assembly moves to the right against the rear end of the cylinder body; at the same time, the oil introduced into chamber E pushes the adjusting piston to the left, and the oil in chamber F is discharged from port C. The oil in chamber F is completely discharged, and the adjusting piston moves to the left against the front cover;

[0009] At this time, if the oil port C is locked, the adjusting piston is fixed at the far left end, and the maximum stroke of the hydraulic cylinder is S; if the oil port C is opened, the system hydraulic oil is introduced from the oil port C, and the system hydraulic oil is introduced into the F chamber, the adjusting piston moves to the right, and the cylinder stroke can be adjusted to any size between S and 0;

[0010] 2) Adjust the stroke to the required size Sn. When the piston is moved to the leftmost end in step 1), lock the oil port C, open the oil ports A and B, and introduce the system hydraulic oil from the oil port B. The system hydraulic oil enters the G chamber to push the piston rod assembly to the left. Conversely, introduce the system hydraulic oil from the oil port A. The system hydraulic oil passes through the oil port A, the first oil channel, the D chamber, and the second oil channel into the E chamber, which will push the piston rod assembly to the right. In this way, the piston rod assembly is adjusted to the desired stroke Sn.

[0011] 3) Close the locking oil port B to lock and fix the piston rod assembly so that it will not move; open the oil ports C and A, and let the system hydraulic oil flow from the oil port C. The system hydraulic oil flows into the F chamber, pushing the adjusting piston to the right, and the hydraulic oil in the E chamber is discharged from the oil port A until the oil in the E chamber is completely discharged, and the adjusting piston is completely pressed against the piston rod assembly to the right;

[0012] 4) Close the locking oil port C to lock and fix the adjusting piston; then open the oil ports A and B, and let the system hydraulic oil in from the oil port A. The system hydraulic oil passes through the oil port A through the first oil passage, the D chamber, and the second oil passage into the E chamber, pushing the piston rod assembly to the right, and the oil in the G chamber is discharged from the oil port B. The oil in the G chamber is completely discharged, and the piston rod assembly moves to the right against the rear end of the cylinder body; the stroke of the cylinder is set to Sn, and normal work is performed with Sn as the stroke;

[0013] 5) According to step 1), step 2), step 3), and step 4), the cylinder stroke can be adjusted to any size between 0 and S; after the adjustment, port C will always be in a locked state, the adjusted stroke and installation distance will be fixed, and opening ports A and B will push the hydraulic cylinder to operate according to the adjusted stroke Sn.

[0014] The beneficial effects of the present invention are as follows: the present invention solves the problem that after the conventional hydraulic cylinder is produced, the stroke S is fixed and cannot be changed, and the cylinder can be arbitrarily adjusted and changed in the stroke between 0 and S, and the maximum extended length also changes by the same unit length. After adjustment, the cylinder has a memory function and will operate according to the adjusted stroke in the future.

[0015] The present invention does not require replacement of hydraulic cylinder equipment and does not require a large installation space. The hydraulic cylinder stroke can be adjusted as needed only through hydraulic adjustment, and has a stroke memory function. It has a simple structure, is easy to operate, and is safe and reliable to control. It is low in cost to install, use, and maintain, saving time and resources without delaying production operations. It can be used in situations where the hydraulic cylinder stroke needs to be changed according to the needs of the installation equipment and the needs of the working conditions. It does not require manual close-range operation, and only requires hydraulic adjustment to change the cylinder stroke and the maximum telescopic length to meet the needs. It saves the design, manufacturing, and replacement costs of the new cylinder, and also saves the equipment space modification costs. It almost does not delay the production operation of the equipment, and it has high safety and low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the oil cylinder of the present invention;

[0017] Figure 2 It is a state diagram when the piston rod assembly of the oil cylinder of the present invention moves to the right and is close to the cylinder body and the regulating piston moves to the left and is close to the front cover;

[0018] Figure 3 This is a state diagram of the piston rod assembly of the oil cylinder of the present invention when it moves to the left to the stroke Sn to be adjusted;

[0019] Figure 4 This is a state diagram when the piston rod assembly of the oil cylinder of the present invention no longer moves and the regulating piston moves to the right and completely close to the piston rod assembly;

[0020] Figure 5 This is a state diagram of the oil cylinder of the present invention when the regulating piston moves to the left to the required adjustment stroke Sn;

[0021] Figure 6It is a structural schematic diagram of a conventional hydraulic cylinder whose cylinder stroke cannot be adjusted;

[0022] Figure 7 It is a schematic diagram of the structure of a conventional hydraulic cylinder with adjustable cylinder stroke. DETAILED DESCRIPTION

[0023] like Figure 1 As shown, a stroke-adjustable oil cylinder with memory function comprises a cylinder body 1, a piston rod assembly 2, a front cover 3, an adjusting piston 4, a cylinder body sealing rod 5 and a sealing member. The cylinder body 1 is provided with an adjusting piston 4, a piston rod assembly 2 and a cylinder body sealing rod 5. The front cover 3 is connected between the cylinder body 1 and the piston rod assembly 2. The cylinder body 1 and the cylinder body sealing rod 5 are connected as a whole. The cylinder body sealing rod 5 is placed in the piston rod assembly 2. The adjusting piston 4 is arranged between the cylinder body 1 and the piston rod assembly 2. The piston rod assembly 2 can move left and right, and the adjusting piston 4 can also move left and right. An F cavity 14 is formed between the cylinder body 1, the front cover 3, the piston rod assembly 2 and the adjusting piston 4. An E cavity 12 is formed between the cylinder body 1, the piston rod assembly 2 and the adjusting piston 4. A G cavity 13 is formed between the cylinder body 1, the piston rod assembly 2 and the cylinder body sealing rod 5. A D cavity 15 is formed between the piston rod assembly 2 and the cylinder body sealing rod 5. The cylinder body 1 is provided with three oil ports, namely, oil port A1-1, oil port B1-2, and oil port C1-3, which can be connected to the high-pressure hydraulic oil of the hydraulic system. The three oil port joints can be controlled to open and lock by the system control valve. When locked, the hydraulic oil in the cylinder body 1 is sealed in the cavity and cannot flow out through the oil port. The cylinder body sealing rod 5 is provided with a first oil passage 5-1 connected to the oil port A1-1 and the D cavity 15 respectively, and the piston rod assembly 2 is provided with a second oil passage 2-1 connected to the D cavity 15 and the E cavity 12 respectively. The oil port A1-1 is connected to the E cavity 12 through the first oil passage 5-1, the D cavity 15, and the second oil passage 2-1; the oil port B1-2 is connected to the G cavity 13; and the oil port C1-3 is connected to the F cavity 14. Among the three oil ports A1-1, B1-2 and C1-3, the oil port C1-3 is only used when adjusting the stroke and is locked after the adjustment is completed. Locking the oil port C1-3 will lock the F chamber 14, and the oil in the F chamber 14 can neither flow out nor flow in, and the size will no longer change. The adjusting piston 4 will be fixed and cannot move, and the adjusting piston 4, the F chamber 14, the front cover 3 and the cylinder body 1 will be connected and fixed as a whole. A first seal 6 is provided between the piston rod assembly 2 and the front cover 3, a second seal 7 is provided between the cylinder body 1 and the front cover 3, a third seal 8 is provided between the piston rod assembly 2 and the adjusting piston 4, a fourth seal 9 is provided between the cylinder body 1 and the adjusting piston 4, a fifth seal 10 is provided between the cylinder body 1 and the piston rod assembly 2, and a sixth seal 11 is provided between the piston rod assembly 2 and the cylinder body sealing rod 5. The function of the seal is to prevent the hydraulic oil from passing through in the placement position.

[0024] A method for operating an oil cylinder with a memory function and an arbitrarily adjustable stroke comprises the following steps:

[0025] 1) The initial state is as follows Figure 1 As shown, the three oil ports A1-1, B1-2 and C1-3 are opened at the same time, and the system hydraulic oil is introduced from the oil port A1-1, and the system hydraulic oil is introduced into the E chamber 12 through the oil port A1-1 via the first oil passage 5-1, the D chamber 15 and the second oil passage 2-1. The oil in the E chamber 12 increases and expands, and the pressure increases, pushing the piston rod assembly 2 to move rightward, and the oil in the G chamber 13 is discharged from the oil port B1-2, and the G chamber 13 gradually shrinks to zero, and the oil is completely discharged, and the piston rod assembly 2 is pressed against the rear end of the cylinder body 1 to the right; at the same time, the oil introduced into the E chamber 12 will also push the regulating piston 4 to move leftward, and the oil in the F chamber 14 is discharged from the oil port C1-3, and the F chamber 14 gradually shrinks to zero, and the oil is completely discharged, and the regulating piston 4 is pressed against the front cover 3 to the left. The final state is as shown in FIG. Figure 2 shown.

[0026] At this time, if the oil port C1-3 is locked, the regulating piston 4 is fixed at the leftmost end, and the maximum stroke of the hydraulic cylinder (the distance that the piston rod assembly 2 can move in the cylinder when the cylinder is working) is S. If the oil port C1-3 is opened later, the system hydraulic oil is introduced from the oil port C1-3, and the system hydraulic oil is introduced into the F chamber 14, the regulating piston 4 moves to the right. By adjusting the regulating piston 4 to move to the right and fixing them at different positions, the stroke of the cylinder can be adjusted to any size between S and 0.

[0027] 2) Adjust the stroke to the required size Sn, where Sn is the stroke that the cylinder needs to set. In step 1), when the piston is adjusted to move to the far left, lock the oil port C1-3, open the oil ports A1-1 and B1-2, and introduce the system hydraulic oil from the oil port B1-2. The system hydraulic oil enters the G chamber 13, and the oil in the G chamber 13 increases and expands, and the pressure increases, pushing the piston rod assembly 2 to move to the left. Conversely, introduce the system hydraulic oil from the oil port A1-1, and the system hydraulic oil passes through the oil port A1-1 through the first oil channel 5-1, the D chamber 15, and the second oil channel 2-1 into the E chamber 12, which will push the piston rod assembly 2 to move to the right, so as to adjust the piston rod assembly 2 to the desired stroke Sn, as shown in the figure. Figure 3 shown.

[0028] 3) Close the locking oil port B1-2, that is, lock the G chamber 13, that is, lock and fix the piston rod assembly 2, and it will no longer move. Next, open the oil ports C1-3 and A1-1, and introduce the system hydraulic oil from the oil port C1-3, and the system hydraulic oil enters the F chamber 14. The oil in the F chamber 14 increases and expands, and the pressure increases, pushing the adjusting piston 4 to the right. The hydraulic oil in the E chamber 12 is discharged from the oil port A1-1 until the oil in the E chamber 12 is completely discharged, and the E chamber 12 is zero. The adjusting piston 4 is completely pressed against the piston rod assembly 2 to the right. At this time, the oil port C1-3 is locked, that is, the adjusting piston 4 is locked and fixed. At this time, the stroke adjustment of the hydraulic cylinder is completed, such as Figure 4 shown.

[0029] 4) Close the locking oil port C1-3, that is, lock and fix the adjusting piston 4. Then open the oil ports A1-1 and B1-2, and let the system hydraulic oil in from the oil port A1-1. The system hydraulic oil passes through the oil port A1-1 through the first oil passage 5-1, D chamber 15, and the second oil passage 2-1 into the E chamber 12, pushing the piston rod assembly 2 to move rightward, and the oil in the G chamber 13 is discharged from the oil port B1-2. The G chamber 13 gradually shrinks to zero, and the oil is completely discharged. The piston rod assembly 2 moves rightward and closes to the rear end of the cylinder body 1; the piston rod assembly is in a fully retracted state as shown in the figure. Figure 5 As shown in the figure, the stroke of the cylinder is set to Sn, and the cylinder can work normally with Sn as the stroke.

[0030] 5) According to the methods described in steps 1), 2), 3), and 4), the cylinder stroke can be adjusted to any size between 0 and S. After the adjustment, the oil port C1-3 will always be in a locked state and will not participate in the subsequent work of the cylinder. The adjusted stroke and installation distance will be memorized and fixed. Opening the oil ports A1-1 and B1-2 will push the hydraulic cylinder to operate according to the adjusted stroke Sn.

[0031] It should be understood that the parts not elaborated in detail in this specification belong to the prior art. The above embodiments are only descriptions of the preferred implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made by ordinary engineers and technicians in this field to the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A cylinder with memory function and adjustable stroke, comprising a cylinder body, a piston rod assembly, a front cover and a seal, characterized in that An adjusting piston movable left and right is arranged in the cylinder body, a cylinder sealing rod connected to the cylinder body is placed in the piston rod assembly, the piston rod assembly can move left and right, an F chamber is formed between the cylinder body, the front cover, the piston rod assembly and the adjusting piston, an E chamber is formed between the cylinder body, the piston rod assembly and the adjusting piston, a G chamber is formed between the cylinder body, the piston rod assembly and the cylinder sealing rod, and a D chamber is formed between the piston rod assembly and the cylinder sealing rod; oil ports A, B and C are respectively opened on the cylinder body; a first oil passage connected to the oil ports A and D chambers respectively is arranged in the cylinder sealing rod, a second oil passage connected to the D chamber and E chamber respectively is arranged in the piston rod assembly; oil port B is connected to the G chamber; oil port C is connected to the F chamber, and a first sealing member is arranged between the piston rod assembly and the front cover; The operating method of the oil cylinder with memory function whose stroke can be adjusted arbitrarily comprises the following steps: 1) Open ports A, B and C at the same time, and introduce system hydraulic oil from port A. The system hydraulic oil passes through port A, the first oil passage, D chamber and the second oil passage into chamber E, pushing the piston rod assembly to the right, and the oil in chamber G is discharged from port B. The oil in chamber G is completely discharged, and the piston rod assembly moves to the right against the rear end of the cylinder body; at the same time, the oil introduced into chamber E pushes the adjusting piston to the left, and the oil in chamber F is discharged from port C. The oil in chamber F is completely discharged, and the adjusting piston moves to the left against the front cover; At this time, if the oil port C is locked, the adjusting piston is fixed at the far left end, and the maximum stroke of the hydraulic cylinder is S; if the oil port C is opened, the system hydraulic oil is introduced from the oil port C, and the system hydraulic oil is introduced into the F chamber, the adjusting piston moves to the right, and the cylinder stroke can be adjusted to any size between S and 0; 2) Adjust the stroke to the required size Sn. When the piston is moved to the leftmost end in step 1), lock the oil port C, open the oil ports A and B, and introduce the system hydraulic oil from the oil port B. The system hydraulic oil enters the G chamber to push the piston rod assembly to the left. Conversely, introduce the system hydraulic oil from the oil port A. The system hydraulic oil passes through the oil port A, the first oil channel, the D chamber, and the second oil channel into the E chamber, which will push the piston rod assembly to the right. In this way, the piston rod assembly is adjusted to the desired stroke Sn. 3) Close the locking oil port B to lock and fix the piston rod assembly so that it will not move; open the oil ports C and A, and let the system hydraulic oil flow from the oil port C. The system hydraulic oil flows into the F chamber, pushing the adjusting piston to the right, and the hydraulic oil in the E chamber is discharged from the oil port A until the oil in the E chamber is completely discharged, and the adjusting piston is completely pressed against the piston rod assembly to the right; 4) Close the locking oil port C to lock and fix the adjusting piston; then open the oil ports A and B, and let the system hydraulic oil in from the oil port A. The system hydraulic oil passes through the oil port A through the first oil passage, the D chamber, and the second oil passage into the E chamber, pushing the piston rod assembly to the right, and the oil in the G chamber is discharged from the oil port B. The oil in the G chamber is completely discharged, and the piston rod assembly moves to the right against the rear end of the cylinder body; the stroke of the cylinder is set to Sn, and normal work is performed with Sn as the stroke; 5) According to step 1), step 2), step 3), and step 4), the cylinder stroke can be adjusted to any size between 0 and S; after the adjustment, port C will always be in a locked state, the adjusted stroke and installation distance will be fixed, and opening ports A and B will push the hydraulic cylinder to operate according to the adjusted stroke Sn.

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