A variable frequency and variable amplitude hydraulic servo loading device and loading method

Abstract

The present invention proposes a variable frequency and variable amplitude hydraulic servo loading device and a loading method, which belongs to the field of hydraulic loading devices. The present invention solves the problems of high control precision and great control difficulty of the existing hydraulic servo loading device. The present invention comprises a servo motor, a plunger, a push rod, a swash plate mechanism, a rotating shaft and a rotating shaft base, wherein the servo motor is connected to the rotating shaft, the rotating shaft is rotatably connected to the rotating shaft base, a plunger slideway is provided at the front end of the rotating shaft, the end of the plunger slideway is an oil quantity changing chamber, the plunger is slidably connected in the plunger slideway, a plunger spring is provided between the plunger and the rotating shaft, the swash plate mechanism comprises a swash plate, the front end of the plunger contacts the swash plate, the swash plate mechanism is rotatably connected to the base, the push rod is connected to the swash plate mechanism, an oil chamber is provided in the rotating shaft base, an oil channel is provided in the rotating shaft, one end of the oil channel is connected to the oil chamber, and the other end is connected to the oil quantity changing chamber. The present invention is mainly used for variable frequency and variable amplitude hydraulic servo loading.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic loading devices, and in particular relates to a variable frequency and variable amplitude hydraulic servo loading device and a loading method. Background Art

[0002] At present, the hydraulic servo loading device is realized by installing a servo valve in the hydraulic system, and the pressure of the hydraulic system is adjusted by the servo valve to realize the variable frequency and variable amplitude pressure output of the loading cylinder. Since the clearance between the valve core and the valve sleeve of the servo valve is very small, if the hydraulic oil of the hydraulic system is not clean enough, it will directly affect the quality of the pressure output, and the cleanliness of the hydraulic oil is very difficult to control, resulting in unstable loading pressure output. The servo valve controls the pressure of the hydraulic system through the opening of the valve core. The slight change in the opening has a greater impact on the pressure value, and its control accuracy is high and the control difficulty is great. Summary of the invention

[0003] In view of this, the present invention aims to provide a variable frequency and variable amplitude hydraulic servo loading device and a loading method to solve the problems of high control accuracy and great control difficulty of the existing hydraulic servo loading device.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a variable frequency and variable amplitude hydraulic servo loading device, which includes a servo motor, a plunger, a push rod, a swash plate mechanism, a rotating shaft and a rotating shaft base, the servo motor is connected to the rotating shaft, the rotating shaft is rotatably connected to the rotating shaft base, a plunger slide is opened at the front end of the rotating shaft, the end of the plunger slide is an oil quantity changing chamber, the plunger is slidably connected in the plunger slide, a plunger spring is arranged between the plunger and the rotating shaft, the swash plate mechanism includes a swash plate, the front end of the plunger contacts the swash plate, the swash plate mechanism is rotatably connected to the base, the push rod is connected to the swash plate mechanism, an oil chamber is opened in the rotating shaft base, an oil channel is opened in the rotating shaft, one end of the oil channel is connected to the oil chamber, and the other end is connected to the oil quantity changing chamber.

[0005] Furthermore, the servo motor is connected to the rotating shaft through a coupling.

[0006] Furthermore, the swash plate mechanism also includes a swash plate base and an angle seat, the swash plate is connected to the swash plate base, the swash plate base is rotatably connected to the angle seat, the angle seat is arranged on the base, and the push rod is connected to the swash plate base.

[0007] Furthermore, the swash plate is connected to the swash plate base via a bearing.

[0008] Furthermore, the push rod is connected to a push rod motor, and the push rod motor is connected to the base via a support.

[0009] Furthermore, a reverse thrust rod is arranged on the opposite side of the push rod, the reverse thrust rod is slidably connected to the rotating shaft base, the head end of the reverse thrust rod is connected to the swash plate base, and the rear end of the reverse thrust rod is connected to the reverse thrust rod spring.

[0010] Furthermore, a sensor is arranged on the outside of the plunger, and the sensor is connected to the base through a sensor seat.

[0011] Furthermore, the sensor is a Hall sensor.

[0012] Furthermore, a rotating shaft bearing is arranged between the rotating shaft and the rotating shaft base.

[0013] The present invention also provides a loading method for a variable frequency and variable amplitude hydraulic servo loading device, wherein a push rod pushes a swash plate base to rotate the swash plate base around an angle seat to adjust the inclination of the swash plate, a servo motor drives a rotating shaft to rotate, and a plunger rotates along the rotating shaft. The plunger is always in contact with the swash plate under the preload of a plunger spring and slides back and forth along a plunger slideway. During the sliding process of the plunger, the volume of the hydraulic oil in the oil quantity changing chamber changes, thereby changing the overall volume of the hydraulic oil in the oil chamber, the oil channel and the oil quantity changing chamber. The oil chamber is connected to a loading cylinder to realize variable frequency and variable amplitude loading.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention realizes the change of the volume of the hydraulic oil in the loading device through the reciprocating motion of the plunger along the swash plate, and can realize linear variable frequency and variable amplitude loading. Compared with the existing hydraulic servo loading device, the present invention has low adjustment difficulty and high precision. The loading pressure can be adjusted by adjusting the inclination of the swash plate, and there is no need to use a servo valve. The output pressure linearity meets the variable frequency and variable amplitude loading requirements of the loading cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a structural schematic diagram of a variable frequency and variable amplitude hydraulic servo loading device according to the present invention;

[0017] Figure 2 It is a schematic diagram of the lateral structure of the swash plate mechanism of a variable frequency and variable amplitude hydraulic servo loading device according to the present invention;

[0018] Figure 3 The present invention is a schematic diagram of the structure of a rotating shaft base of a variable frequency and variable amplitude hydraulic servo loading device.

[0019] 1-servo motor, 2-coupling, 3-anti-thrust rod spring, 4-anti-thrust rod, 5-plunger, 6-swash plate base, 7-push rod, 8-push rod motor, 9-support, 10-bearing, 11-swash plate, 12-angle seat, 13-sensor seat, 14-rotating shaft, 15-plunger spring, 16-rotating shaft base, 17-rotating shaft bearing. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0021] See also Figure 1-3 The present embodiment is described as a variable frequency and variable amplitude hydraulic servo loading device, which includes a servo motor 1, a plunger 5, a push rod 7, a swash plate mechanism, a rotating shaft 14 and a rotating shaft base 16, wherein the servo motor 1 is connected to the rotating shaft 14, and the rotating shaft 14 is rotatably connected to the rotating shaft base 16, a plunger slide is provided at the front end of the rotating shaft 14, and the end of the plunger slide is an oil quantity changing chamber, the plunger 5 is slidably connected in the plunger slide, and a plunger spring 15 is provided between the plunger 5 and the rotating shaft 14, the swash plate mechanism includes a swash plate 11, the front end of the plunger 5 is in contact with the swash plate 11, the swash plate mechanism is rotatably connected to the base, the push rod 7 is connected to the swash plate mechanism, an oil chamber is provided in the rotating shaft base 16, and an oil channel is provided in the rotating shaft 14, one end of the oil channel is connected to the oil chamber, and the other end is connected to the oil quantity changing chamber.

[0022] In this embodiment, the push rod 7 pushes the swash plate mechanism to rotate around the base, thereby adjusting the inclination of the swash plate 11. The servo motor 1 drives the rotating shaft 14 to rotate, and the plunger 5 rotates together with the rotating shaft 14. The plunger 5 is always in contact with the swash plate 11 under the preload of the plunger spring 15, and slides back and forth along the plunger slideway. During the sliding process of the plunger 5, the volume of the hydraulic oil in the oil quantity change chamber changes, thereby changing the overall volume of the hydraulic oil in the oil chamber, the oil channel and the oil quantity change chamber. The oil chamber is connected to the loading cylinder to realize variable frequency and variable amplitude loading.

[0023] The servo motor 1 is connected to the rotating shaft 14 through the coupling 2 to ensure stable connection. The swash plate mechanism also includes a swash plate base 6 and an angle seat 12. The swash plate 11 is connected to the swash plate base 6. The swash plate base 6 is rotatably connected to the angle seat 12. The angle seat 12 is arranged on the base. The push rod 7 is connected to the swash plate base 6. The swash plate 11 is connected to the swash plate base 6 through the bearing 10. The swash plate base 6 provides support for the swash plate 11. The push rod 7 pushes the swash plate base 6 to rotate the swash plate base 6 around the angle seat 12 to adjust the inclination of the swash plate 11. The push rod 7 is connected to the push rod motor 8, and the push rod motor 8 is connected to the base through the support 9. The push rod 7 is driven by the push rod motor 8 to move. A reverse push rod 4 is arranged on the opposite side of the push rod 7. The reverse push rod 4 is slidably connected to the rotating shaft base 16. The head end of the reverse push rod 4 is connected to the swash plate base 6. The rear end of the reverse push rod 4 is connected to the reverse push rod spring 3. The reverse push rod 4 is used to reversely support the rotating shaft base 16 to ensure the stability of the swash plate 11. A sensor is arranged on the outside of the plunger 5. The sensor is connected to the base through the sensor seat 13. The sensor is used to detect the position and movement state of the plunger 5. The sensor is preferably a Hall sensor. A rotating shaft bearing 17 is arranged between the rotating shaft 14 and the rotating shaft base 16 to ensure the smooth rotation of the rotating shaft 14.

[0024] This embodiment is a loading method of a variable frequency and variable amplitude hydraulic servo loading device, wherein the push rod 7 pushes the swash plate base 6 to rotate around the angle seat 12 to adjust the inclination of the swash plate 11, and the reverse push rod 4 provides reverse support to the swash plate base 6 under the action of the reverse push rod spring 3, and the servo motor 1 drives the rotating shaft 14 to rotate, and the plunger 5 rotates with the rotating shaft 14. The plunger 5 is always in contact with the swash plate 11 under the preload of the plunger spring 15, and slides back and forth along the plunger slideway. During the sliding process of the plunger 5, the volume of the hydraulic oil in the oil volume change chamber changes, thereby changing the overall volume of the hydraulic oil in the oil chamber, the oil channel and the oil volume change chamber. The oil chamber is connected to the loading cylinder to realize variable frequency and variable amplitude loading. During the rotation of the rotating shaft 14, the Hall sensor detects the position and movement state of the plunger 5 to reflect the variable frequency and variable amplitude loading of the device.

[0025] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A variable frequency and variable amplitude hydraulic servo loading device, characterized in that: It comprises a servo motor (1), a plunger (5), a push rod (7), a swash plate mechanism, a rotating shaft (14) and a rotating shaft base (16), wherein the servo motor (1) is connected to the rotating shaft (14), the rotating shaft (14) is rotatably connected to the rotating shaft base (16), a plunger slideway is provided at the front end of the rotating shaft (14), the end of the plunger slideway is an oil quantity changing chamber, the plunger (5) is slidably connected in the plunger slideway, a plunger spring (15) is provided between the plunger (5) and the rotating shaft (14), the swash plate mechanism comprises a swash plate (11), the front end of the plunger (5) is in contact with the swash plate (11), the swash plate mechanism is rotatably connected to the base, the push rod (7) is connected to the swash plate mechanism, an oil chamber is provided in the rotating shaft base (16), the rotating shaft (1 An oil passage is provided in the swash plate mechanism (4), one end of the oil passage is connected to the oil chamber, and the other end is connected to the oil quantity change chamber. The swash plate mechanism also includes a swash plate base (6) and an angle seat (12). The swash plate (11) is connected to the swash plate base (6). The swash plate base (6) is rotatably connected to the angle seat (12). The angle seat (12) is arranged on the base. The push rod (7) is connected to the swash plate base (6). A reverse push rod (4) is arranged on the opposite side of the push rod (7). The reverse push rod (4) is slidably connected to the rotating shaft base (16). The head end of the reverse push rod (4) is connected to the swash plate base (6). The rear end of the reverse push rod (4) is connected to the reverse push rod spring (3). A sensor is arranged on the outer side of the plunger (5). The sensor is connected to the base through the sensor seat (13).

2. A variable frequency and variable amplitude hydraulic servo loading device according to claim 1, characterized in that: The servo motor (1) is connected to the rotating shaft (14) via a coupling (2).

3. The variable frequency and variable amplitude hydraulic servo loading device according to claim 1, characterized in that: The swash plate (11) is connected to the swash plate base (6) via a bearing (10).

4. The variable frequency and variable amplitude hydraulic servo loading device according to claim 1, characterized in that: The push rod (7) is connected to a push rod motor (8), and the push rod motor (8) is connected to a base via a support (9).

5. The variable frequency and variable amplitude hydraulic servo loading device according to claim 1, characterized in that: The sensor is a Hall sensor.

6. The variable frequency and variable amplitude hydraulic servo loading device according to claim 1, characterized in that: A rotating shaft bearing (17) is provided between the rotating shaft (14) and the rotating shaft base (16).

7. A loading method of a variable frequency and variable amplitude hydraulic servo loading device as claimed in claim 1, characterized in that: The push rod (7) pushes the swash plate base (6) so that the swash plate base (6) rotates around the angle seat (12) to adjust the inclination of the swash plate (11). The servo motor (1) drives the rotating shaft (14) to rotate, and the plunger (5) rotates along with the rotating shaft (14). The plunger (5) is always in contact with the swash plate (11) under the preload of the plunger spring (15) and slides back and forth along the plunger slideway. During the sliding process of the plunger (5), the volume of the hydraulic oil in the oil volume change chamber changes, thereby changing the overall volume of the hydraulic oil in the oil chamber, the oil channel and the oil volume change chamber. The oil chamber is connected to the loading cylinder to realize variable frequency and variable amplitude loading.

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