Electro-hydraulic actuating mechanism

Abstract

The utility model relates to the technical field of actuators, in particular to an electro-hydraulic actuating mechanism. Comprising a main box body, double-acting hydraulic cylinders, piston type racks and a fluted disc are arranged in the main box body, the number of the double-acting hydraulic cylinders is two, the two double-acting hydraulic cylinders are symmetrically arranged on the two sides of the main box body, the two piston type racks are arranged in the double-acting hydraulic cylinders respectively, the fluted disc is meshed between the two piston type racks, a through hole is formed in the fluted disc, and a through hole is formed in the fluted disc. An output shaft is arranged in the through hole; the oil tank, the two-way hydraulic pump and the energy storage assembly are communicated through a first connecting pipeline, and the two-way hydraulic pump is used for charging the energy storage assembly; the energy storage assembly communicates with the double-acting hydraulic cylinder through a first driving pipeline, and an electromagnetic reversing valve is further arranged on the first driving pipeline. Through the arrangement, the double-acting hydraulic cylinder, the piston type rack and the fluted disc are used for enabling the output shaft to control the movement of the valve, and the stress uniformity and large-torque output of the output shaft can be guaranteed through the arrangement of the energy storage assembly.

Description

Technical Field

[0001] The present disclosure relates to the technical field of actuators, and in particular to an electro-hydraulic actuator. Background Art

[0002] Bidirectional sealed ball valves have been widely used in natural gas long-distance transmission stations. Since the switching torque of such valves is very large, the supporting actuators are mostly electric or manual reducers. The electric control switching cycle is long, overload protection occurs from time to time, and the manual operation cycle is even longer. In addition, due to the excessive switching torque of the valve, the reducer is particularly large, which cannot meet the market's needs for short switching time and small size. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides an electro-hydraulic actuator.

[0004] The present disclosure provides an electro-hydraulic actuator, comprising a main housing, a double-acting hydraulic cylinder, an oil tank, a piston rack, a gear plate, an electromagnetic reversing valve, an energy storage assembly and a bidirectional hydraulic pump;

[0005] The main housing is provided with the double-acting hydraulic cylinder, the piston rack and the toothed disc. The double-acting hydraulic cylinder is provided with two, and the two double-acting hydraulic cylinders are symmetrically arranged on both sides of the main housing. The two piston racks are respectively arranged in the double-acting hydraulic cylinder, and the toothed disc is meshed between the two piston racks. A through hole is arranged in the toothed disc, and an output shaft is arranged in the through hole.

[0006] The oil tank, the bidirectional hydraulic pump and the energy storage assembly are connected through a first connecting pipeline, and the bidirectional hydraulic pump is used to charge the energy storage assembly;

[0007] The energy storage assembly and the double-acting hydraulic cylinder are communicated with each other through a first driving pipeline, and an electromagnetic reversing valve is also arranged on the first driving pipeline.

[0008] Optionally, it further includes a second connecting pipeline, on which a manual hydraulic pump and a one-way valve are provided, one end of the second connecting pipeline is connected to the oil tank, and the other end of the second connecting pipeline is connected to the energy storage assembly.

[0009] Optionally, the first connecting pipeline and the second connecting pipeline are connected in parallel.

[0010] Optionally, it further includes a second drive pipeline, one end of which is connected to the energy storage assembly, the other end of which is connected to the double-acting hydraulic cylinder, and a manual reversing valve is provided on the second drive pipeline.

[0011] Optionally, the energy storage assembly includes an accumulator and a safety valve group, and the first connecting pipeline, the second connecting pipeline, the first driving pipeline and the second driving pipeline are all connected to the safety valve group.

[0012] Optionally, a liquid level sensor is further provided in the oil tank, and the liquid level sensor is used to detect the liquid level in the oil tank.

[0013] Optionally, a support is further provided, which is arranged on the lower side of the main box body and is used to support the output shaft.

[0014] Optionally, a pressure regulating overflow valve is also provided on the first connecting pipeline.

[0015] Optionally, a pressure sensor is further included, and the pressure sensor is used to detect the pressure value of the safety valve group.

[0016] Optionally, it further comprises a control unit and a driving unit, wherein the driving unit is electrically connected to the bidirectional hydraulic pump, the control unit is used to control the driving unit, and the driving unit is used to control the bidirectional hydraulic pump.

[0017] Compared with the prior art, the technical solution provided by this embodiment has the following advantages:

[0018] The present disclosure provides an electro-hydraulic actuator, including a main housing, a double-acting hydraulic cylinder, a piston rack, a toothed disc, an electromagnetic reversing valve, an energy storage assembly, a bidirectional hydraulic pump and an oil tank. During operation: the hydraulic oil in the oil tank is transported to the energy storage assembly through the bidirectional hydraulic pump and the first connecting pipeline, so that the pressure in the energy storage assembly reaches the set working pressure value. Then the electromagnetic reversing valve is opened, and the hydraulic oil in the energy storage assembly can be transmitted to the two double-acting hydraulic cylinders. The double-acting hydraulic cylinders push the piston gear to move in the double-acting hydraulic cylinders, so that the toothed disc meshing with the piston rack rotates. The rotation of the toothed disc can output torque to the output shaft, so that the valve controlled by the output shaft is opened or closed. Through the above-mentioned arrangement, the present disclosure uses a double-acting hydraulic cylinder, a piston rack and a toothed disc so that the output shaft controls the movement of the valve, and the uniformity of the force on the output shaft and the large torque output can be ensured through the arrangement of the energy storage assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of the electro-hydraulic actuator described in the embodiment of the present disclosure;

[0022] Figure 2 It is a front view of the electro-hydraulic actuator according to the embodiment of the present disclosure;

[0023] Figure 3 for Figure 2 Cross-sectional view along AA direction.

[0024] Among them, 1. main box; 2. double-acting hydraulic cylinder; 3. oil tank; 31. liquid level sensor; 4. piston rack; 5. gear disc; 6. electromagnetic reversing valve; 7. energy storage component; 71. accumulator; 72. safety valve group; 8. two-way hydraulic pump; 9. output shaft; 10. first connecting pipeline; 11. first drive pipeline; 12. second connecting pipeline; 121. manual hydraulic pump; 122. one-way valve; 13. second drive pipeline; 14. manual reversing valve; 15. support; 16. pressure regulating overflow valve; 17. pressure sensor; 18. control unit; 19. drive unit. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0027] The present disclosure provides an electro-hydraulic actuator, comprising a main housing 1, a double-acting hydraulic cylinder 2, a piston rack 4, a gear plate 5, an electromagnetic reversing valve 6, an energy storage assembly 7, a bidirectional hydraulic pump 8 and an oil tank 3;

[0028] A double-acting hydraulic cylinder 2, a piston rack 4 and a toothed disc 5 are arranged in the main housing 1. Two double-acting hydraulic cylinders 2 are arranged symmetrically on both sides of the main housing 1. Two piston racks 4 are arranged in the double-acting hydraulic cylinder 2 respectively. The toothed disc 5 is meshed between the two piston racks 4. A through hole is arranged in the toothed disc 5, and an output shaft 9 is arranged in the through hole.

[0029] The oil tank 3, the bidirectional hydraulic pump 8 and the energy storage assembly 7 are connected through a first connecting pipeline 10, and the bidirectional hydraulic pump 8 is used to charge the energy storage assembly 7;

[0030] The energy storage assembly 7 and the double-acting hydraulic cylinder 2 are connected via a first drive pipeline 11 , and an electromagnetic reversing valve 6 is also provided on the first drive pipeline 11 .

[0031] like Figures 1 to 3 As shown, the present disclosure provides an electro-hydraulic actuator, including a main box 1, a double-acting hydraulic cylinder 2, a piston rack 4, a toothed disc 5, an electromagnetic reversing valve 6, an energy storage assembly 7, a bidirectional hydraulic pump 8 and an oil tank 3. During operation: the hydraulic oil in the oil tank 3 is delivered to the energy storage assembly 7 through the bidirectional hydraulic pump 8 and the first connecting pipeline 10, so that the pressure in the energy storage assembly 7 reaches the set working pressure value. Then the electromagnetic reversing valve 6 is opened, and the hydraulic oil in the energy storage assembly 7 can be delivered to the two double-acting hydraulic cylinders 2, and the double-acting hydraulic cylinders 2 push the piston gear to move in the double-acting hydraulic cylinder 2, so that the toothed disc 5 meshing with the piston rack 4 rotates, and the rotation of the toothed disc 5 can output torque to the output shaft 9, so that the valve controlled by the output shaft 9 is opened or closed.

[0032] Through the above arrangement, in this embodiment, the double-acting hydraulic cylinder 2, the piston rack 4 and the gear plate 5 are used to enable the output shaft 9 to control the movement of the valve, and the uniformity of the force on the output shaft 9 and the large torque output can be ensured by the arrangement of the energy storage assembly 7.

[0033] In addition, it also includes a second connecting pipeline 12, on which a manual hydraulic pump 121 and a one-way valve 122 are provided, one end of the second connecting pipeline 12 is connected to the oil tank 3, and the other end of the second connecting pipeline 12 is connected to the energy storage assembly 7. Figure 1 As shown, the present embodiment also includes a first connecting pipeline 10. When the first connecting pipeline 10 fails to be powered off, the energy storage assembly 7 can be charged through the second connecting pipeline 12. A manual hydraulic pump 121 is provided on the second connecting pipeline 12. The manual hydraulic pump 121 is used to pump the hydraulic oil in the oil tank 3 into the energy storage assembly 7. The one-way valve 122 is used to control the circulation of the second connecting pipeline 12.

[0034] In this embodiment, the first connecting pipeline 10 and the second connecting pipeline 12 are connected in parallel. In this embodiment, the first connecting pipeline 10 and the second connecting pipeline 12 are arranged in parallel. When power is on, the hydraulic oil charges the energy storage component 7 through the first connecting pipeline 10. When power is off, the hydraulic oil charges the energy storage component 7 through the second connecting pipeline 12.

[0035] Furthermore, it also includes a second drive pipeline 13, one end of which is connected to the energy storage assembly 7, and the other end of which is connected to the double-acting hydraulic cylinder 2, and a manual reversing valve 14 is provided on the second drive pipeline 13. In this embodiment, in addition to the first drive pipeline 11, the second drive pipeline 13 is also provided. After the first drive pipeline 11 is powered off, the electromagnetic reversing valve 6 fails, and the manual mode can be turned on, and the manual reversing valve 14 is placed in the corresponding control position, so that the hydraulic oil in the energy storage assembly 7 flows to the double-acting hydraulic cylinder 2, so that the valve is opened or closed.

[0036] As for the energy storage assembly 7, the energy storage assembly 7 includes an accumulator 71 and a safety valve group 72. The first connecting pipeline 10, the second connecting pipeline 12, the first driving pipeline 11 and the second driving pipeline 13 are all connected to the safety valve group 72. The energy storage assembly 7 in this embodiment includes the accumulator 71 and the safety valve group 72. The accumulator 71 is used to supplement the fluid of the pump in the hydraulic system and reduce the specifications of the fluid pump. The safety valve group 72 is used to control the pressure value in each pipeline.

[0037] like Figure 1 As shown, a liquid level sensor 31 is also provided in the oil tank 3, and the liquid level sensor 31 is used to detect the liquid level in the oil tank 3, so that the user can judge the liquid level in the oil tank 3 and replenish the hydraulic oil in the oil tank 3 in time.

[0038] In addition, if Figure 2 As shown, a support 15 is also provided, and the support 15 is arranged on the lower side of the main housing 1, and the support 15 is used to support the output shaft 9. In this embodiment, a support 15 is also provided, and the support 15 is a circular ring structure, one side of the support 15 is connected to the main housing 1, and the output end of the output shaft 9 can extend out of the hole of the support 15.

[0039] Furthermore, a pressure regulating relief valve 16 is also provided on the first connecting pipeline 10. The pressure regulating relief valve 16 is provided on the first connecting pipeline 10 to control the pressure value of the first connecting pipeline 10, thereby playing a safety protection role.

[0040] In this embodiment, a control unit 18 and a drive unit 19 are further included. The drive unit 19 is electrically connected to the bidirectional hydraulic pump 8. The control unit 18 is used to control the drive unit 19, and the drive unit 19 is used to control the bidirectional hydraulic pump 8. The drive unit 19 in this embodiment is a motor. The control unit 18 can send a signal to control the motor to start, so that the motor can drive the bidirectional hydraulic pump 8 to pump hydraulic oil into the accumulator 71.

[0041] In addition, a pressure sensor 17 is included, and the pressure sensor 17 is used to detect the pressure value of the safety valve group 72. The pressure value obtained by the pressure sensor 17 in this embodiment can be transmitted to the control unit 18, and the control unit 18 determines whether the real-time pressure value reaches the set pressure value. When the real-time pressure value is lower than the set pressure value, the control unit 18 sends a signal to control the motor and the bidirectional hydraulic pump 8 to start.

[0042] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0043] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electro-hydraulic actuator, characterized in that: It comprises a main box (1), a double-acting hydraulic cylinder (2), an oil tank (3), a piston rack (4), a gear plate (5), an electromagnetic reversing valve (6), an energy storage component (7) and a bidirectional hydraulic pump (8); The main housing (1) is provided with the double-acting hydraulic cylinder (2), the piston rack (4) and the toothed disc (5); two double-acting hydraulic cylinders (2) are provided, and the two double-acting hydraulic cylinders (2) are symmetrically arranged on both sides of the main housing (1); the two piston racks (4) are respectively arranged in the double-acting hydraulic cylinder (2); the toothed disc (5) is meshed between the two piston racks (4); a through hole is arranged in the toothed disc (5), and an output shaft (9) is arranged in the through hole; The oil tank (3), the bidirectional hydraulic pump (8) and the energy storage assembly (7) are connected via a first connecting pipeline (10), and the bidirectional hydraulic pump (8) is used to charge the energy storage assembly (7); The energy storage assembly (7) and the double-acting hydraulic cylinder (2) are connected via a first drive pipeline (11), and an electromagnetic reversing valve (6) is also provided on the first drive pipeline (11).

2. The electro-hydraulic actuator according to claim 1, characterized in that: It also comprises a second connecting pipeline (12), on which a manual hydraulic pump (121) and a one-way valve (122) are provided, one end of the second connecting pipeline (12) is connected to the oil tank (3), and the other end of the second connecting pipeline (12) is connected to the energy storage assembly (7).

3. The electro-hydraulic actuator according to claim 2, characterized in that: The first connecting pipeline (10) and the second connecting pipeline (12) are connected in parallel.

4. The electro-hydraulic actuator according to claim 3, characterized in that: It also includes a second drive pipeline (13), one end of which is connected to the energy storage assembly (7), and the other end of which is connected to the double-acting hydraulic cylinder (2), and a manual reversing valve (14) is provided on the second drive pipeline (13).

5. The electro-hydraulic actuator according to claim 4, characterized in that: The energy storage assembly (7) comprises an accumulator (71) and a safety valve group (72); the first connecting pipeline (10), the second connecting pipeline (12), the first drive pipeline (11) and the second drive pipeline (13) are all connected to the safety valve group (72).

6. The electro-hydraulic actuator according to claim 1, characterized in that: The oil tank (3) is also provided with a liquid level sensor (31), and the liquid level sensor (31) is used to detect the liquid level in the oil tank (3).

7. The electro-hydraulic actuator according to claim 1, characterized in that: A support (15) is also provided, and the support (15) is arranged on the lower side of the main box body (1), and the support (15) is used to support the output shaft (9).

8. The electro-hydraulic actuator according to claim 1, characterized in that: The first connecting pipeline (10) is also provided with a pressure regulating overflow valve (16).

9. The electro-hydraulic actuator according to claim 5, characterized in that: It also includes a pressure sensor (17), wherein the pressure sensor (17) is used to detect the pressure value of the safety valve group (72).

10. The electro-hydraulic actuator according to claim 1, characterized in that: It also includes a control unit (18) and a drive unit (19), wherein the drive unit (19) and the bidirectional hydraulic pump (8) are electrically connected, the control unit (18) is used to control the drive unit (19), and the drive unit (19) is used to control the bidirectional hydraulic pump (8).

Images