A stroke compensation hydraulic system

Abstract

The present invention discloses a stroke compensation hydraulic system, including a working cylinder, a synchronous cylinder group, a cylinder control valve, an adjustment cylinder and an adjustment control valve; the synchronous cylinder group includes a master cylinder and a synchronous cylinder, the synchronous cylinders are arranged side by side, and a driving beam is arranged between the master cylinder and the synchronous cylinder; the master cylinder is connected to one side of the driving beam, and the synchronous cylinder is connected to the other side of the driving beam, and the cylinder control valve can control the movement of the master cylinder, and the driving beam is driven to translate by the master cylinder, and then the piston of the synchronous cylinder is pushed to move the same distance by the driving beam. By adopting the present invention, an adjustment cylinder can be connected in the oil circuit of a specific working cylinder, and the oil between the working cylinder and the synchronous cylinder can be injected or extracted, so that the working cylinders move synchronously with a predetermined distance difference to meet different application requirements.

Description

Technical Field

[0001] The invention relates to a hydraulic system, in particular to a stroke compensation hydraulic system. Background Art

[0002] In the hydraulic system of a ceramic press, multiple hydraulic cylinders are often required to work in strict synchronization. For the production process requirements of a large-tonnage ceramic press, it is also necessary to be able to adjust the stroke of several of the hydraulic cylinders so that each group of hydraulic cylinders moves in stages according to a predetermined distance difference. Therefore, it is urgent to propose a hydraulic system that can meet the above requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a stroke compensation hydraulic system which can make the working cylinders move synchronously or move out of step with a predetermined distance difference.

[0004] In order to solve the above technical problems, the present invention provides a stroke compensation hydraulic system, including a working cylinder, a synchronous cylinder group, a cylinder control valve, an adjustment cylinder and an adjustment control valve;

[0005] The synchronous cylinder group includes a main cylinder and a synchronous cylinder, the synchronous cylinders are arranged side by side, and a driving beam is arranged between the main cylinder and the synchronous cylinder;

[0006] The master cylinder is connected to one side of the driving beam, and the synchronous cylinder is connected to the other side of the driving beam. The cylinder control valve can control the action of the master cylinder, and the driving beam is driven to translate by the master cylinder, and then the piston of the synchronous cylinder is pushed to move the same distance by the driving beam.

[0007] The synchronization cylinder is connected to the corresponding working cylinder through a hydraulic oil pipe, and the hydraulic oil pipe is also connected to the adjustment cylinder. The adjustment control valve is used to control the adjustment cylinder to inject a certain amount of hydraulic oil into the hydraulic oil pipe or extract it from the hydraulic oil pipe.

[0008] As an improvement of the above solution, the adjustment cylinder includes a cylinder body, an adjustment screw, a piston and a cylinder sleeve;

[0009] The adjusting screw, the piston and the cylinder sleeve are all arranged on the oil cylinder body. The oil cylinder body is provided with a first cavity. The adjusting screw extends from the top of the oil cylinder body into the first cavity.

[0010] The piston comprises a driving part and a volume adjusting part, wherein the driving part is provided with a first sealing ring which is sealedly connected to the inner wall of the first cavity, and the adjusting part is provided with a second sealing ring and a third sealing ring which are sealedly connected to the inner wall of the cylinder sleeve;

[0011] The first cavity is connected to a first control oil circuit and a second control oil circuit, and the first control oil circuit and the second control oil circuit are separated by the first sealing ring;

[0012] The cylinder sleeve is arranged below the first cavity, and the cylinder sleeve is provided with a first working cavity and a second working cavity, the first cavity and the first working cavity are separated by a second sealing ring, and the first working cavity and the second working cavity are separated by a third sealing ring;

[0013] The first working chamber is connected to a first working oil circuit, and the second working chamber is connected to a second working oil circuit.

[0014] As an improvement of the above solution, an adjusting screw mounting seat is provided on the top of the oil cylinder body, and the adjusting screw is installed in the adjusting screw mounting seat by threaded engagement.

[0015] As an improvement of the above solution, a locking nut is further provided on the adjusting screw.

[0016] As an improvement of the above solution, the horizontal cross-sectional area of ​​the first working cavity is twice that of the second working cavity.

[0017] As an improvement of the above solution, the driving part pushes the volume adjustment part to move in the first working chamber and the second working chamber through the hydraulic oil introduced into the first control oil circuit and the second control oil circuit to adjust the volume of the first working chamber and the second working chamber.

[0018] As an improvement of the above solution, a blind hole is further provided on the top of the piston. When the piston moves upward, the adjusting screw extends into the blind hole and abuts against the bottom of the blind hole.

[0019] As an improvement of the above solution, the bottom of the blind hole is lower than the height of the connection position between the second control oil circuit and the first cavity.

[0020] As an improvement of the above scheme, there are 4 groups of synchronous cylinders and working cylinders, and each synchronous cylinder drives a corresponding working cylinder; the adjustment cylinder is connected to two groups of synchronous cylinders and working cylinders, and a certain amount of oil is injected into the synchronous cylinders and working cylinders connected to it, or extracted from the synchronous cylinders and working cylinders connected to it.

[0021] As an improvement of the above solution, there are two adjusting cylinders, the first adjusting cylinder is connected to two groups of synchronous cylinders and working cylinders, and the second adjusting cylinder is connected to the other two groups of synchronous cylinders and working cylinders.

[0022] The implementation of the present invention has the following beneficial effects:

[0023] The present invention connects one side of the driving beam through the master cylinder, and the synchronous cylinder connects the other side of the driving beam. The cylinder control valve can control the action of the master cylinder, and the driving beam is driven to translate by the master cylinder, and then the piston of the synchronous cylinder is pushed to move the same distance by the driving beam, so that the working cylinders can be ensured to move in strict synchronization. By connecting an adjustment cylinder in the oil circuit of a specific working cylinder, and injecting or extracting the oil between the working cylinder and the synchronous cylinder, the working cylinders can move synchronously with a predetermined distance difference to meet different application requirements.

[0024] The adjusting oil cylinder drives the piston to move up and down by introducing hydraulic oil into the first control oil circuit or the second control oil circuit to change the volume of the first working chamber and the second working chamber, thereby injecting or extracting a certain amount of hydraulic oil from the corresponding hydraulic device. The maximum volume of the first working chamber and the second working chamber is controlled by the adjusting screw, and the overall structure is compact, the adjustment is convenient, and the working stability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a first embodiment of a stroke compensation hydraulic system of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a first embodiment of the adjustment oil cylinder of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a second embodiment of the adjusting oil cylinder of the present invention;

[0028] Figure 4 It is a schematic diagram of a second embodiment of a stroke compensation hydraulic system of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0030] like Figure 1 As shown, the first embodiment of the present invention provides a stroke compensation hydraulic system, comprising a working cylinder (1, 2), a synchronous cylinder group, a cylinder control valve 5, an adjustment cylinder 6 and an adjustment control valve 7;

[0031] The synchronous cylinder group comprises a main cylinder 8 and synchronous cylinders (3, 4), the synchronous cylinders (3, 4) are arranged side by side, and a driving beam 9 is arranged between the main cylinder 8 and the synchronous cylinders (3, 4);

[0032] The main oil cylinder 8 is connected to one side of the driving beam 9, and the synchronous oil cylinder (3, 4) is connected to the other side of the driving beam 9. The oil cylinder control valve 5 can control the movement of the main oil cylinder 8, and the driving beam 9 is driven to move horizontally by the main oil cylinder 8, and then the piston of the synchronous oil cylinder (3, 4) is pushed to move the same distance by the driving beam 9;

[0033] The synchronous cylinder (3, 4) is connected to the corresponding working cylinder (1, 2) via a hydraulic oil pipe 10, and the hydraulic oil pipe 10 is also connected to the adjusting cylinder 6. The adjusting control valve 7 is used to control the adjusting cylinder 6 to inject a certain amount of hydraulic oil into the hydraulic oil pipe 10 or to draw it out from the hydraulic oil pipe 10.

[0034] Combination Figure 2 The adjusting oil cylinder 6 comprises an oil cylinder body 61, an adjusting screw 62, a piston 63 and a cylinder sleeve 64. The adjusting screw 62, the piston 63 and the cylinder sleeve 64 are all arranged on the oil cylinder body 61. The oil cylinder body 61 is provided with a first cavity 611. The adjusting screw 62 extends into the first cavity 611 from the top of the oil cylinder body 61. The piston 63 comprises a driving part 631 and a volume adjusting part 632. The driving part 631 is provided with a first sealing ring 633 which is sealedly connected to the inner wall of the first cavity 611. The volume adjusting part 632 is provided with a second sealing ring 634 and a third sealing ring 635 which are sealedly connected to the inner wall of the cylinder sleeve 64. The first cavity 611 is connected to a first control oil circuit 65 and a second control oil circuit 66, and the first control oil circuit 65 and the second control oil circuit 66 are separated by the first sealing ring 633; ​​the cylinder sleeve 64 is arranged below the first cavity 611, and the cylinder sleeve 64 is provided with a first working chamber 641 and a second working chamber 642, the first cavity 611 and the first working chamber 641 are separated by the second sealing ring 634, the first working chamber 641 and the second working chamber 642 are separated by the third sealing ring 635, the first working chamber 641 is connected to a first working oil circuit 67, and the second working chamber 642 is connected to a second working oil circuit 68.

[0035] The oil cylinder drives the piston 63 to move up and down by passing hydraulic oil into the first control oil circuit 65 or the second control oil circuit 66 to change the volume of the first working chamber 641 and the second working chamber 642, thereby injecting or extracting a certain amount of hydraulic oil from the corresponding hydraulic device. The maximum volume of the first working chamber 641 and the second working chamber 642 is controlled by the adjusting screw 62, and the overall structure is compact, the adjustment is convenient, and the working stability is high.

[0036] In order to facilitate the installation and sealing of the adjusting screw 62, an adjusting screw mounting seat 612 is provided on the top of the oil cylinder body 61, and the adjusting screw 62 is mounted in the adjusting screw mounting seat 612 by threaded engagement. Figure 2 As shown, the adjusting screw mounting seat 612 can be fixed to the cylinder body 61 by bolts or welding, or can be fixed to the cylinder body 61 by bolts or welding. Figure 3 As shown, the adjusting screw 62 is connected to the oil cylinder body 61 through a thread 616. The adjusting screw 62 is also provided with a locking nut 69. After the adjusting screw 62 is rotated, the adjusting screw 62 and the oil cylinder body 61 can be fixed by the locking nut 69 to prevent the adjusting screw 62 from loosening due to the movement of the piston 63, thereby affecting the adjustment accuracy of the adjusting screw 62.

[0037] Preferably, the cylinder body 61 includes a cylinder cover 613, and the first cavity 611 is arranged in the cylinder cover 613. The cylinder body 61 also includes a cylinder base 614, and the first working oil circuit 67 and the second working oil circuit 68 are arranged in the cylinder base 614. Among them, the "cylinder base 614" is not a necessary component in most application scenarios, and the "cylinder base 614" can be arranged separately or integrated into other components. It is marked here only to better express the installation method of the cylinder. In order to prevent the hydraulic oil from leaking between the adjusting screw 62 and the adjusting screw mounting seat 612, a sealing ring 615 is also provided between the adjusting screw 62 and the adjusting screw mounting seat 612.

[0038] According to this embodiment, the horizontal cross-sectional area of ​​the first working chamber 641 is twice that of the second working chamber 642. Since the portion where the piston 63 extends into the second working chamber 642 is the same as the cross-sectional area of ​​the second working chamber 642, when the horizontal cross-sectional area of ​​the first working chamber 641 is twice that of the second working chamber 642, the volumes of the first working chamber 641 and the second working chamber 642 will change in a one-to-one ratio, which is conducive to connecting different hydraulic components in the first working chamber 641 and the second working chamber 642, and synchronously and equally controlling the connected hydraulic components.

[0039] Specifically, the driving part 631 pushes the volume adjustment part 632 to move in the first working chamber 641 and the second working chamber 642 through the hydraulic oil introduced into the first control oil circuit 65 and the second control oil circuit 66 to adjust the volume of the first working chamber 641 and the second working chamber 642 .

[0040] In order to conveniently adjust the stroke of the piston 63, a blind hole 636 is further provided on the top of the piston 63. When the piston 63 moves upward, the adjusting screw 62 extends into the blind hole 636 and contacts the bottom of the blind hole 636. The bottom of the blind hole 636 is lower than the height of the connection position of the second control oil circuit 66 and the first cavity 611. By providing the blind hole 636, the position where the adjusting screw 62 applies force to the piston 63 can be adjusted. When the bottom of the blind hole 636 is lower than the height of the connection position of the second control oil circuit 66 and the first cavity 611, when the piston 63 moves upward quickly and collides with the adjusting screw 62, the tendency of the piston 63 to deviate to both sides is reduced, the vibration is low, the wear of the piston 63 after long-term movement can be reduced, and the working stability of the piston 63 can be improved.

[0041] According to this embodiment, there are 4 groups of synchronous cylinders (3, 4) and working cylinders (1, 2), and each synchronous cylinder drives a corresponding working cylinder; the adjustment cylinder 6 is connected to two groups of synchronous cylinders and working cylinders, and injects a certain amount of oil into the synchronous cylinders and working cylinders connected to it, or draws it out from the synchronous cylinders and working cylinders connected to it. Specifically, the adjusting cylinder 6 has a first working chamber 641 and a second working chamber 642 which are independent of each other. The volumes of the first working chamber 641 and the second working chamber 642 are controlled by the piston 63 in the adjusting cylinder 6. When the piston 63 rises, the volumes of the first working chamber 641 and the second working chamber 642 increase, and part of the hydraulic oil in the synchronous cylinder 3 and the working cylinder 1 enters the first working chamber 641 or the second working chamber 642, so that the starting moving position of the working cylinder 1 is lower than when the piston 63 descends; the action of the four groups of working cylinders (1, 2) is manifested as two groups and one row of synchronous movement in a stepped manner; when the piston 63 descends, the hydraulic oil re-enters the synchronous cylinder 3 and the working cylinder 1, and at this time, the action of the four groups of working cylinders (1, 2) is manifested as synchronous movement in rows.

[0042] Combination Figure 4 According to the second embodiment of the present invention, the difference from the first embodiment is that there are two adjusting cylinders 6, the first adjusting cylinder 6 is connected to two groups of synchronous cylinders 3 and working cylinder 1, and the second adjusting cylinder 6 is connected to the other two groups of synchronous cylinders 4 and working cylinder 2. In this embodiment, the four groups of working cylinders (1, 2) can be adjusted to extend or move synchronously in units of two groups according to the different connected adjusting cylinders 6, and the adjustment is more comprehensive.

[0043] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A stroke compensation hydraulic system, characterized in that: It includes working cylinder, synchronous cylinder group, cylinder control valve, adjusting cylinder and adjusting control valve; The synchronous cylinder group includes a main cylinder and a synchronous cylinder, the synchronous cylinders are arranged side by side, and a driving beam is arranged between the main cylinder and the synchronous cylinder; The master cylinder is connected to one side of the driving beam, and the synchronous cylinder is connected to the other side of the driving beam. The cylinder control valve can control the action of the master cylinder, and the driving beam is driven to translate by the master cylinder, and then the piston of the synchronous cylinder is pushed to move the same distance by the driving beam. The synchronous cylinder is connected to the corresponding working cylinder through a hydraulic oil pipe, and the hydraulic oil pipe is also connected to the adjustment cylinder. The adjustment control valve is used to control the adjustment cylinder to inject a certain amount of hydraulic oil into the hydraulic oil pipe or draw it out from the hydraulic oil pipe; The adjustment cylinder comprises a cylinder body, an adjusting screw, a piston and a cylinder sleeve; The adjusting screw, the piston and the cylinder sleeve are all arranged on the oil cylinder body. The oil cylinder body is provided with a first cavity. The adjusting screw extends from the top of the oil cylinder body into the first cavity. The piston comprises a driving part and a volume adjusting part, wherein the driving part is provided with a first sealing ring which is sealedly connected to the inner wall of the first cavity, and the adjusting part is provided with a second sealing ring and a third sealing ring which are sealedly connected to the inner wall of the cylinder sleeve; The first cavity is connected to a first control oil circuit and a second control oil circuit, and the first control oil circuit and the second control oil circuit are separated by the first sealing ring; The cylinder sleeve is arranged below the first cavity, and the cylinder sleeve is provided with a first working cavity and a second working cavity, the first cavity and the first working cavity are separated by a second sealing ring, and the first working cavity and the second working cavity are separated by a third sealing ring; The first working chamber is connected to a first working oil circuit, and the second working chamber is connected to a second working oil circuit; An adjusting screw mounting seat is provided on the top of the oil cylinder body; The adjusting screw is also provided with a locking nut; The maximum volumes of the first working chamber and the second working chamber are controlled by the adjusting screw.

2. The stroke compensation hydraulic system according to claim 1, characterized in that: The adjusting screw is installed in the adjusting screw mounting seat by threaded engagement.

3. The stroke compensation hydraulic system according to claim 1, characterized in that: The horizontal cross-sectional area of ​​the first working chamber is twice that of the second working chamber.

4. The stroke compensation hydraulic system according to claim 1, characterized in that: The driving part pushes the volume adjustment part to move in the first working chamber and the second working chamber via the hydraulic oil introduced through the first control oil circuit and the second control oil circuit, so as to adjust the volumes of the first working chamber and the second working chamber.

5. The stroke compensation hydraulic system according to claim 1, characterized in that: The top of the piston is also provided with a blind hole. When the piston moves upward, the adjusting screw extends into the blind hole and abuts against the bottom of the blind hole.

6. The stroke compensation hydraulic system according to claim 5, characterized in that: The bottom of the blind hole is lower than the height of the connection position between the second control oil passage and the first cavity.

7. The stroke compensation hydraulic system according to any one of claims 1 to 6, characterized in that: There are 4 groups of synchronous cylinders and working cylinders in total, and each synchronous cylinder drives a corresponding working cylinder; the adjusting cylinder is connected to two groups of synchronous cylinders and working cylinders, and a certain amount of oil is injected into the synchronous cylinders and working cylinders connected to it, or extracted from the synchronous cylinders and working cylinders connected to it.

8. The stroke compensation hydraulic system according to any one of claims 1 to 6, characterized in that: There are two adjusting cylinders in total, the first adjusting cylinder is connected to two groups of synchronous cylinders and working cylinders, and the second adjusting cylinder is connected to the other two groups of synchronous cylinders and working cylinders.

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