CN214998612U - Low-frequency variable resonance electro-hydraulic excitation cylinder - Google Patents
Low-frequency variable resonance electro-hydraulic excitation cylinder Download PDFInfo
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- CN214998612U CN214998612U CN202121329527.0U CN202121329527U CN214998612U CN 214998612 U CN214998612 U CN 214998612U CN 202121329527 U CN202121329527 U CN 202121329527U CN 214998612 U CN214998612 U CN 214998612U
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Abstract
The utility model relates to an electricity liquid excitation technical field specifically discloses a resonance electricity liquid excitation jar is become to low frequency and stepless change method of resonant frequency thereof, including outer cylinder body, built-in liquid accuse check valve, inner cylinder body, runner, truncated cone coil spring, buffer spring, inner piston, piston rod, exhaust hole. The utility model discloses to traditional electricity liquid excitation jar resonance energy be difficult to utilize, resonant frequency adjusts difficult scheduling problem, utilize truncated cone coil spring rigidity variability, through infinitely variable control truncated cone coil spring rigidity and then infinitely variable control excitation jar natural frequency for the excitation jar produces the resonance at the low frequency working section, promotes vibration output amplitude or load, effectively improves electricity liquid excitation jar work efficiency.
Description
Technical Field
The utility model relates to an electricity liquid excitation technical field, concretely relates to low frequency becomes resonance electricity liquid excitation jar and resonant frequency infinitely variable method thereof.
Background
With the development of the modern industrial technical level, especially in order to meet the requirements of a plurality of engineering machinery vibration environment simulation experiments, higher requirements are put forward on the working frequency range, the vibration output load and the amplitude of the electro-hydraulic vibration exciter and the controllability of the electro-hydraulic vibration exciter. The electro-hydraulic excitation cylinder is an actuating mechanism of an electro-hydraulic excitation system and is equipment driven by an electro-hydraulic principle to generate corresponding vibration. The resonance generated by the electro-hydraulic excitation cylinder is a phenomenon that the vibration output amplitude or load is increased when the electro-hydraulic excitation frequency is consistent with or close to the natural frequency of an excitation cylinder system.
In the low-frequency working section of the electro-hydraulic excitation cylinder, the problem that the amplitude of the output load is sharply attenuated when the excitation frequency is increased exists. The natural frequency of the traditional electro-hydraulic excitation cylinder is the result of the interaction of the load mass and a hydraulic spring formed by the compressibility of oil in a working cavity of the hydraulic cylinder, so the resonance generated by the traditional electro-hydraulic excitation cylinder is generally in a high frequency band, and the resonance generated by the traditional electro-hydraulic excitation cylinder can generate larger shock wave pressure, damage an equipment sealing device and influence the stability and the safety of an excitation system, so that the vibration output amplitude or load is difficult to be improved by utilizing resonance energy at a resonance point. And the resonant frequency of the traditional electro-hydraulic excitation cylinder is generally difficult to adjust, so that the working efficiency of the electro-hydraulic excitation cylinder is greatly influenced by the excitation frequency.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem mentioned in the background art, the utility model aims to provide a low frequency becomes resonance electricity liquid excitation jar and resonant frequency stepless change method for the excitation jar is in the low frequency section within range, can freely adjust system natural frequency and make it unanimous with the excitation frequency, reaches the purpose of increase vibration output load or amplitude.
The purpose of the utility model can be realized by the following technical scheme:
a low-frequency variable-resonance electro-hydraulic excitation cylinder comprises an outer cylinder body, a built-in hydraulic control one-way valve, an inner cylinder body, a flow passage, a truncated cone spiral spring, a buffer spring, an inner piston, a piston rod and an exhaust hole.
The inner cylinder body can reciprocate in the outer cylinder body under the action of hydraulic oil, and a first-stage left cavity and a first-stage right cavity are formed by the inner cylinder body and the outer cylinder body; the piston rod can reciprocate in the inner cylinder body under the action of hydraulic oil, and a secondary left cavity and a secondary right cavity are formed by the piston rod and the inner cylinder body; the left cavity of the second stage is provided with a truncated cone helical spring, and the left end and the right end of the truncated cone helical spring are respectively and fixedly connected with the inner cylinder body and the piston rod; the second-stage right cavity is provided with an inner piston, the inner piston divides the second-stage right cavity into a buffer chamber and a pressure oil cavity, the inner piston can reciprocate in the inner cylinder under the action of hydraulic oil, the buffer chamber is provided with a buffer spring, and the left end and the right end of the buffer spring are respectively and fixedly connected with a piston rod and the inner piston; the second-stage left chamber and the buffer chamber are free of hydraulic oil and communicated with the outside air through exhaust holes.
The built-in hydraulic control one-way valve controls hydraulic oil to flow from the first-stage left cavity to the pressure oil cavity in a one-way mode, and a control oil path of the hydraulic control one-way valve is communicated with the first-stage right cavity.
A hydraulic control system of the method comprises an electro-hydraulic vibration exciting valve, a first throttling valve, a second throttling valve, a third throttling valve, an oil tank, an overflow valve and a hydraulic source.
When the variable resonance electro-hydraulic excitation cylinder works, the primary left chamber and the primary right chamber of the variable resonance electro-hydraulic excitation cylinder are alternately communicated with a hydraulic source and an oil tank under the action of an electro-hydraulic excitation valve, so that the inner cylinder body does reciprocating motion; the pressure of the pressure oil chamber is higher than the pressure of the first-stage left chamber and the first-stage right chamber, the built-in hydraulic control one-way valve is closed, the pressure oil chamber is in a locked state, the piston rod reciprocates under the driving of the inner cylinder body and the action of the truncated cone helical spring and the buffer spring, and an excitation waveform is output; compared with the mechanical spring compressibility, the oil compressibility can be ignored, the natural frequency of the variable resonance electro-hydraulic excitation cylinder is mainly related to the stiffness of the truncated cone helical spring and the stiffness of the buffer spring, the natural frequency is low, and at the moment, if the excitation frequency is consistent with or close to the natural frequency of the variable resonance electro-hydraulic excitation cylinder system, resonance can occur, and the vibration output amplitude or load is greatly improved.
Adjusting the natural frequency of the variable resonance electro-hydraulic excitation cylinder system: when the variable resonance electro-hydraulic excitation cylinder is in no-load, the electro-hydraulic excitation valve is in a middle position, the excitation cylinder is in a locking state, the first throttle valve is opened, the second third throttle valve is closed, the pressure of the overflow valve is adjusted to be higher than the pressure of the pressure oil cavity chamber, hydraulic oil enters the pressure oil cavity chamber under the action of the built-in hydraulic control one-way valve, the inner piston moves leftwards, the piston rod moves leftwards under the pushing of the buffer spring and compresses the truncated cone spiral spring until the large circle of the truncated cone spiral spring starts to generate a parallel-winding phenomenon, the rigidity of the truncated cone spiral spring is continuously increased until the truncated cone spiral spring is completely tightened, the inherent frequency of the variable resonance excitation cylinder is further increased, resonance can be generated under different excitation frequencies, and the purpose of continuously adjusting the rigidity of the truncated cone spiral spring and further continuously adjusting the resonance frequency of the excitation cylinder is achieved;
when the electro-hydraulic shock excitation valve is in the middle position, the shock excitation cylinder is in a locking state, the first throttle valve is closed, the second throttle valve and the third throttle valve are opened, the pressure of the overflow valve is adjusted to be higher than the pressure of the pressure oil chamber, high-pressure oil acts on the built-in hydraulic control one-way valve control oil way through the first-stage right chamber, the hydraulic control one-way valve is opened, the pressure oil chamber is communicated with the oil tank through the first-stage left chamber, the second throttle valve and the oil tank for pressure relief, the truncated cone spiral spring resets, and the oil tank returns to the initial state.
The utility model has the advantages that:
(1) the utility model discloses a low frequency becomes resonance electricity liquid excitation jar makes excitation jar natural frequency lower under truncated cone coil spring and buffer spring's effect, and excitation jar natural frequency is relevant with truncated cone coil spring and buffer spring's rigidity this moment, it is irrelevant with fluid compressibility, thereby can not produce great shock wave pressure influence excitation system's stability and security, resonance energy can be by abundant rational utilization at the low frequency section, compare in traditional electricity liquid excitation jar, stepless change resonance electricity liquid excitation jar can output bigger amplitude or vibration load under same excitation frequency and hydraulic pressure source.
(2) The utility model provides a resonance frequency infinitely variable method of low frequency change resonance electricity liquid excitation jar, this infinitely variable resonance electricity liquid excitation jar changes excitation jar system natural vibration frequency through the rigidity that changes truncated cone coil spring, can be through infinitely variable control truncated cone coil spring rigidity and then infinitely variable control excitation jar system natural frequency, make can adjust self system natural frequency unanimous with required excitation frequency at low frequency working segment excitation jar, produce the resonance, promote vibration output amplitude or load, effectively improve electricity liquid excitation jar work efficiency.
Drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of the working principle of the present invention.
In the figure: 1-external cylinder body, 101-primary left chamber, 102-primary right chamber, 2-internal hydraulic control one-way valve, 3-internal cylinder body, 31-secondary left chamber, 32-buffer chamber, 33-pressure oil chamber, 4-flow channel, 5-truncated cone spiral spring, 6-buffer spring, 7-internal piston, 8-piston rod, 9-exhaust hole, 10-first throttle valve, 11-second throttle valve, 12-third throttle valve, 13-electro-hydraulic shock excitation valve, 14-oil tank, 15-overflow valve and 16-external load.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the low-frequency variable-resonance electro-hydraulic excitation cylinder comprises an outer cylinder body 1, a built-in hydraulic control one-way valve 2, an inner cylinder body 3, a flow passage 4, a truncated cone helical spring 5, a buffer spring 6, an inner piston 7, a piston rod 8 and an exhaust hole 9.
The inner cylinder body 3 can reciprocate in the outer cylinder body 1 under the action of hydraulic oil, and a first-stage left chamber 101 and a first-stage right chamber 102 are formed by the inner cylinder body and the outer cylinder body; the piston rod 8 can reciprocate in the inner cylinder body 3 under the action of hydraulic oil, and the two cavities form a secondary left cavity 31 and a secondary right cavity; the secondary left chamber 31 is provided with a truncated cone helical spring 5, and the left end and the right end of the truncated cone helical spring 5 are respectively and fixedly connected with the inner cylinder body 3 and the piston rod 8; the secondary right chamber is provided with an inner piston 7, the inner piston 7 divides the secondary right chamber into a buffer chamber 32 and a pressure oil chamber 33, the inner piston 7 can reciprocate in the inner cylinder body 3 under the action of hydraulic oil, the buffer chamber 32 is provided with a buffer spring 6, and the left end and the right end of the buffer spring 6 are respectively and fixedly connected with a piston rod 8 and the inner piston 7; the secondary left chamber 31 and the buffer chamber 32 are free of hydraulic oil and are in communication with the outside air through the vent hole 9.
The built-in hydraulic control one-way valve 2 controls hydraulic oil to flow from the first-stage left cavity 101 to the pressure oil cavity 33 in a one-way mode, and a control oil path of the hydraulic control one-way valve 2 is communicated with the first-stage right cavity 102.
As shown in FIG. 2, a hydraulic control system of the method for stepless variation of the resonant frequency of the low-frequency variable-resonance electro-hydraulic excitation cylinder comprises an electro-hydraulic excitation valve 13, a first throttle valve 10, a second throttle valve 11, a third throttle valve 12, an oil tank 14, an overflow valve 15 and a hydraulic source.
When the variable resonance electro-hydraulic excitation cylinder works, the first-stage left cavity 101 and the first-stage right cavity 102 of the variable resonance electro-hydraulic excitation cylinder are alternately communicated with a hydraulic source and an oil tank under the action of the electro-hydraulic excitation valve 13, so that the inner cylinder body 3 makes reciprocating motion; the pressure of the pressure oil chamber 33 is higher than the pressure of the first-stage left chamber 101 and the first-stage right chamber 102, the built-in hydraulic control one-way valve 2 is closed, the pressure oil chamber 33 is in a locked state, the piston rod 8 is driven by the inner cylinder body 3 and reciprocates under the action of the truncated cone spiral spring 5 and the buffer spring 6, and an excitation waveform is output; compared with the mechanical spring compressibility, the oil compressibility can be ignored, so the natural frequency of the variable resonance electro-hydraulic excitation cylinder is mainly related to the stiffness of the truncated cone helical spring 5 and the stiffness of the buffer spring 6, and the natural frequency is lower, and at the moment, if the excitation frequency is consistent with or close to the natural frequency of the variable resonance excitation cylinder, resonance can occur, and the vibration output amplitude or load is greatly improved.
Adjusting the natural frequency of the variable resonance electro-hydraulic excitation cylinder system: when the variable resonance electro-hydraulic excitation cylinder is in no-load, the electro-hydraulic excitation valve 13 is in a middle position, the excitation cylinder is in a locking state, the first throttle valve 10 is opened, the second throttle valve 11 and the third throttle valve 12 are closed, the pressure of the overflow valve 15 is adjusted to be higher than the pressure of the pressure oil chamber 33, hydraulic oil enters the pressure oil chamber 33 under the action of the built-in hydraulic control one-way valve 2, the inner piston 7 moves leftwards, the piston rod 8 moves leftwards under the pushing of the buffer spring 6, the truncated cone helical spring 5 is compressed until the large circle of the truncated cone helical spring 5 starts to generate a circle combination phenomenon, the rigidity of the truncated cone helical spring 5 is increased till the truncated cone helical spring is completely and tightly combined, the inherent frequency of the variable resonance excitation cylinder is increased continuously, resonance can be generated under different excitation frequencies, and the purpose of stepless adjustment of the rigidity of the truncated cone helical spring 5 and further stepless adjustment of the resonance frequency of the excitation cylinder is achieved;
when the electro-hydraulic shock excitation valve 13 is in the middle position, the shock excitation cylinder is in a locking state, the first throttle valve 10 is closed, the second throttle valve 11 and the third throttle valve 12 are opened, the pressure of the overflow valve 15 is adjusted to be higher than the pressure of the pressure oil chamber 33, high-pressure oil acts on a control oil path of the built-in hydraulic control one-way valve 2 through the first-stage right chamber 102, the hydraulic control one-way valve 2 is opened, the pressure oil chamber is communicated with the oil tank 14 through the first-stage left chamber 101, the second throttle valve 11 and the oil tank 14 for pressure relief, and the truncated cone spiral spring 5 resets and returns to the initial state.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (2)
1. The low-frequency variable-resonance electro-hydraulic excitation cylinder is characterized by comprising an outer cylinder body (1), a built-in hydraulic control one-way valve (2), an inner cylinder body (3), a flow channel (4), a truncated cone helical spring (5), a buffer spring (6), an inner piston (7), a piston rod (8) and an exhaust hole (9);
the inner cylinder body (3) can reciprocate in the outer cylinder body (1) under the action of hydraulic oil, and a first-stage left chamber (101) and a first-stage right chamber (102) are formed by the inner cylinder body and the outer cylinder body; the piston rod (8) can reciprocate in the inner cylinder body (3) under the action of hydraulic oil, and the piston rod and the inner cylinder body form a secondary left cavity (31) and a secondary right cavity; the secondary left chamber (31) is provided with a truncated cone helical spring (5), and the left end and the right end of the truncated cone helical spring (5) are respectively and fixedly connected with the inner cylinder body (3) and the piston rod (8); the secondary right chamber is provided with an inner piston (7), the inner piston (7) divides the secondary right chamber into a buffer chamber (32) and a pressure oil chamber (33), the inner piston (7) can reciprocate in the inner cylinder body (3) under the action of hydraulic oil, the buffer chamber (32) is provided with a buffer spring (6), and the left end and the right end of the buffer spring (6) are respectively and fixedly connected with a piston rod (8) and the inner piston (7); the secondary left chamber (31) and the buffer chamber (32) do not contain hydraulic oil and are communicated with the outside air through the exhaust hole (9);
the built-in hydraulic control one-way valve (2) controls hydraulic oil to flow to the pressure oil chamber (33) from the first-stage left chamber (101) in a one-way mode, and a control oil way of the hydraulic control one-way valve (2) is communicated with the first-stage right chamber (102).
2. The low-frequency variable-resonance electro-hydraulic excitation cylinder as claimed in claim 1, wherein the hydraulic control system comprises an electro-hydraulic excitation valve (13), a first throttle valve (10), a second throttle valve (11), a third throttle valve (12), an oil tank (14), an overflow valve (15) and a hydraulic source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121329527.0U CN214998612U (en) | 2021-06-15 | 2021-06-15 | Low-frequency variable resonance electro-hydraulic excitation cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121329527.0U CN214998612U (en) | 2021-06-15 | 2021-06-15 | Low-frequency variable resonance electro-hydraulic excitation cylinder |
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| Publication Number | Publication Date |
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| CN214998612U true CN214998612U (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121329527.0U Active CN214998612U (en) | 2021-06-15 | 2021-06-15 | Low-frequency variable resonance electro-hydraulic excitation cylinder |
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| CN (1) | CN214998612U (en) |
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- 2021-06-15 CN CN202121329527.0U patent/CN214998612U/en active Active
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