A plunger structure with active adjustment of motion posture

Abstract

The present invention discloses a plunger structure with active adjustment of motion posture. A diversion oil passage is coaxially arranged at the center of the plunger, and a three-axis posture control module is fixedly connected inside; a lithium battery is installed at one end of the plunger close to the plunger head, and a plunger magnetic induction charging coil is arranged on its surface; a sealed annular cavity is coaxially arranged at the end of the plunger far from the plunger head, and an inertia moment regulator is installed inside, and a permanent magnet is fixedly connected to the end close to the plunger head; a plurality of drive coils are circumferentially fixedly connected to the top of the annular cavity, and each drive coil can be individually controlled; the plunger is installed in the plunger cavity of the cylinder block, and a cylinder block magnetic induction charging coil corresponding to the plunger magnetic induction charging coil in position is arranged in the plunger cavity; the cylinder block is fixedly connected to the main shaft, and the power supply is electrically connected to the cylinder block magnetic induction charging coil. The present invention realizes real-time detection and feedback adjustment of the posture of the plunger through the three-axis posture control module, avoiding eccentricity or overturning of the plunger.

Description

Technical Field

[0001] The present invention relates to the field of axial piston pump structure design, and particularly to a piston structure with active adjustment of motion posture. Background Art

[0002] The axial piston pump is a power source in the hydraulic system and one of the core power components in the hydraulic field. It has the advantages of high power density, high pressure, and long service life, and is widely used in fields such as machining, transportation, and aerospace. In the prior art, the clearance between the piston pair of the axial piston pump is the main internal leakage source. At the same time, during the high-speed operation of the piston pump, the oil film in the piston pair clearance will be unevenly distributed due to the eccentricity or overturning of the piston in the cavity, resulting in contact wear between the piston structure and the cylinder copper sleeve, affecting the service life of the piston pump. In severe cases, it will cause the piston and the copper sleeve to be strained, resulting in abnormal wear and damaging the rotor cylinder block. Therefore, ensuring that the piston is always concentric with the cavity in the cavity under high-speed operation can improve the reliability and service life of the piston pump. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention proposes a piston structure with active adjustment of motion posture, which realizes real-time detection and closed-loop adjustment of the posture of the piston during operation, ensures that the piston is always coaxial with the piston cavity in the cylinder block, avoids the occurrence of deviation and overturning faults, and improves the service life of the piston pump.

[0004] The specific technical solution is as follows:

[0005] A piston structure with active adjustment of motion posture, comprising: a piston, a cylinder block, and a main shaft;

[0006] The piston includes: a lithium battery, a piston magnetic induction charging coil, a three-axis posture control module, an inertia moment regulator, a drive coil, an end cover, and a permanent magnet; a diversion oil passage is coaxially arranged in the center of the piston, and a three-axis posture control module is fixedly connected in the diversion oil passage for real-time detection and control of the posture state of the piston; a lithium battery is embedded at one end of the piston close to the piston head, the piston magnetic induction charging coil is arranged on the surface of the lithium battery, and the lithium battery is connected to the three-axis posture control module; the three-axis posture control module can collect piston posture data and perform closed-loop control; a ring-shaped cavity is coaxially arranged at one end of the piston away from the piston head, the end cover is installed at the bottom of the piston to seal the ring-shaped cavity; the inertia moment regulator is installed inside the ring-shaped cavity, and the inertia moment regulator adopts an asymmetric structure design, so that its rotation axis is on the central axis of the piston, but the center of mass is not on the central axis of the piston; a permanent magnet is fixedly connected to one end of the inertia moment regulator close to the piston head; there are multiple drive coils, which are circumferentially fixedly connected to the top of the ring-shaped cavity and connected to the lithium battery, and each drive coil can be independently controlled;

[0007] The plunger is installed in the plunger cavity inside the cylinder block. The cylinder block includes a cylinder block magnetic induction charging coil. The inner wall of the plunger cavity is provided with a cylinder block magnetic induction charging coil, and its position corresponds to that of the plunger magnetic induction charging coil; the cylinder block is fixedly connected to the main shaft, and the power supply is electrically connected to the cylinder block magnetic induction charging coil.

[0008] Furthermore, the plunger further includes a surface protection layer for the plunger coil, which is arranged on the surface of the plunger magnetic induction charging coil for protecting the coil; the cylinder block further includes a surface protection layer for the cylinder block coil, which is arranged on the surface of the cylinder block magnetic induction charging coil for protecting the coil.

[0009] Furthermore, both the surface protection layer for the plunger coil and the surface protection layer for the cylinder block coil are made of rigid magnetic conductive materials.

[0010] Furthermore, the annular cavity is filled with hydraulic oil to increase the damping when the inertia moment regulator moves inside it.

[0011] Furthermore, a cylinder block charging coil is provided at the contact between the cylinder block and the main shaft, and the cylinder block charging coil is connected to the cylinder block magnetic induction charging coil through a wire; the main shaft includes a conductive slip ring and a charging electrode. The charging electrode is arranged at one end of the main shaft and is electrically connected to the power supply; the conductive slip ring is installed on the main shaft and is electrically connected to the charging electrode and the cylinder block charging coil respectively.

[0012] Furthermore, the three-axis pose control module includes an inertial acceleration sensor and a drive control chip. The inertial acceleration sensor is used to collect the attitude position information of the plunger, and the drive control chip is used to realize the closed-loop feedback control of the plunger attitude.

[0013] The beneficial effects of the present invention are as follows:

[0014] (1) Aiming at the eccentricity and overturning phenomena during the operation of the plunger in the cylinder block, the three-axis pose control module detects the three-coordinate pose of the plunger, analyzes the plunger pose in real time, and performs closed-loop pose adjustment to realize the feedback adjustment of the plunger centroid, thereby realizing the real-time self-adjustment of the plunger pose.

[0015] (2) The present invention can ensure that the plunger does not deflect in the cylinder block, ensure that the oil film of the plunger pair is always in a uniform distribution state, effectively reduce the wear of the plunger pair, and improve the service life of the entire plunger pump. Description of the Drawings

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the plunger pump of the present invention.

[0017] Figure 2 It is a sectional view of the A-A section of the plunger pump of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the moment of inertia regulator of the present invention.

[0019] Figure 4 is Figure 2 the sectional view of the B-B section in

[0020] Figure 5 It is an installation sectional view of the plunger pump of the present invention.

[0021] Figure 6 It is a schematic diagram of the eccentricity and plunger overturning state of the plunger pump in the embodiment of the present invention, where (a) is a schematic diagram and sectional view of the eccentric state of the plunger pump, and (b) is a schematic diagram and sectional view of the overturning state of the plunger pump.

[0022] In the figure, there are plunger 1, battery chamber 1-1, lithium battery 1-2, plunger magnetic induction charging coil 1-3, plunger coil surface protection layer 1-4, three-axis pose control module 1-5, moment of inertia regulator 1-6, drive coil 1-7, annular cavity 1-8, end cover 1-9, permanent magnet 1-10, cylinder block 2, cylinder block magnetic induction charging coil 2-1, cylinder block coil surface protection layer 2-2, cylinder block charging coil 2-3, cylinder block copper sleeve 2-4, main shaft 3, conductive slip ring 3-1, charging electrode 3-2, and embedded wire 4. Detailed implementation manners

[0023] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The plunger structure with active adjustment of motion pose includes: plunger 1, cylinder block 2, and main shaft 3.

[0025] Such as Figure 1 , Figure 2As shown in the figure, the plunger 1 includes: a battery cavity 1-1, a lithium battery 1-2, a plunger magnetic induction charging coil 1-3, a surface protection layer 1-4 for the plunger coil, a three-axis pose control module 1-5, a moment of inertia regulator 1-6, a drive coil 1-7, an annular cavity 1-8, an end cap 1-9, and a permanent magnet 1-10. The central axis of the plunger 1 is the plunger axis. A coaxial and hollow diversion oil passage is provided at the plunger axis. An annular groove is provided at one end of the plunger 1 close to the plunger head (i.e., the left end in the figure), and this annular groove is the battery cavity 1-1. An annular lithium battery 1-2 is embedded and installed in the battery cavity 1-1. The plunger magnetic induction charging coil 1-3 is arranged on the surface of the lithium battery 1-2. The surface protection layer 1-4 for the plunger coil is attached to the surface of the plunger magnetic induction charging coil 1-3 to protect the coil from wear. In this embodiment, the surface protection layer 1-4 for the plunger coil is made of a rigid magnetic conductive material.

[0026] The three-axis pose control module 1-5 is embedded and arranged in the diversion oil passage of the plunger 1. The three-axis pose control module 1-5 includes an inertial acceleration sensor and a drive control chip. The inertial acceleration sensor is used to collect the attitude position information of the plunger 1. The drive control chip outputs control information to the lithium battery 1-2 according to the attitude position information of the plunger 1 collected by the inertial acceleration sensor, controls the magnitude of the current output by the lithium battery 1-2, and realizes the closed-loop feedback control of the attitude of the plunger 1, and can perform feedback control on the pose state of the plunger 1 in real time. The lithium battery 1-2 is connected to the three-axis pose control module 1-5 through an embedded wire 4.

[0027] An annular cavity 1-8 coaxial with the plunger 1 is provided at the end of the plunger 1 far from the plunger head. The end cap 1-9 is installed at the bottom of the plunger 1 to make the annular cavity 1-8 form a sealed space. The moment of inertia regulator 1-6 is installed inside the annular cavity 1-8. The annular cavity 1-8 is filled with oil to increase the damping when the moment of inertia regulator 1-6 moves inside it.

[0028] As Figure 3 shown, the moment of inertia regulator 1-6 adopts an asymmetric structure design, so that the rotation axis of the moment of inertia regulator 1-6 is on the central axis of the plunger 1, but its center of mass is not on the central axis of the plunger 1. A permanent magnet 1-10 is fixedly connected to one end of the moment of inertia regulator 1-6 close to the plunger head.

[0029] As Figure 4As shown in the figure, there are multiple driving coils 1-7, which are installed in a circumferential distribution on the top of the annular cavity 1-8 and are connected to the lithium battery 1-2 through the embedded wire 4. Each driving coil 1-7 can be independently controlled, and the input current of each driving coil 1-7 is adjusted in real time through the three-axis pose control module 1-5, thereby adjusting the electromagnetic force of the driving coil 1-7. The permanent magnet 1-10 is driven by the electromagnetic force of the driving coil 1-7, so that the inertia moment regulator 1-6 is subjected to a non-uniform electromagnetic driving force. Under the driving action of the force, the inertia moment regulator 1-6 is driven to translate axially and rotate around the plunger axis in the annular cavity 1-8, realizing the control of the motion state and position of the inertia moment regulator 1-6 in the annular cavity 1-8, and further adjusting the centroid distribution of the plunger 1.

[0030] As Figure 5 shown in the figure, when the plunger 1 is installed, the plunger 1 is installed in the cavity inside the cylinder block 2, and this cavity is the plunger cavity. The cylinder block 2 includes: a cylinder block magnetic induction charging coil 2-1, a cylinder block coil surface protection layer 2-2, a cylinder block charging coil 2-3, and a cylinder block copper sleeve 2-4. An annular groove is provided on the inner wall of the plunger cavity, and the cylinder block copper sleeve 2-4 is embedded in this annular groove, and the surface of the cylinder block copper sleeve 2-4 is flush with the inner wall of the plunger cavity; due to the certain contact lubrication characteristics of the copper material, it plays a role in reducing the surface wear of the plunger. The cylinder block magnetic induction charging coil 2-1 is arranged in a circular attachment on the cylinder block copper sleeve 2-4, and the position of the cylinder block magnetic induction charging coil 2-1 corresponds to that of the plunger magnetic induction charging coil 1-3, so non-contact charging can be realized; the cylinder block coil surface protection layer 2-2 is attached to the surface of the cylinder block magnetic induction charging coil 2-1 to protect the coil and avoid wear; in this embodiment, the cylinder block coil surface protection layer 2-2 is made of a rigid magnetic conductive material.

[0031] The cylinder block 2 is fixedly connected to the main shaft 3. The main shaft 3 includes: a conductive slip ring 3-1 and a charging electrode 3-2. A cylinder block charging coil 2-3 is provided at the contact between the cylinder block 2 and the main shaft 3, and the cylinder block charging coil 2-3 is connected to the cylinder block magnetic induction charging coil 2-1 through the embedded wire 4. The charging electrode 3-2 is provided at one end of the main shaft 3 and is connected to the power supply; the conductive slip ring 3-1 is nested on the main shaft 3 and is respectively connected to the charging electrode 3-2 and the cylinder block charging coil 2-3. Under the zero displacement condition of the plunger pump, the charging electrode 3-2 is connected to the power supply, and the lithium battery 1-2 is charged through the conductive slip ring 3-1.

[0032] During the operation of the plunger pump, the plunger 1 reciprocates in the cylinder block 2. Due to the installation gap between the plunger 1 and the cylinder block 2 during the processing, there is a support oil film of 20 - 30 μm between the plunger 1 and the cylinder block 2 during the actual operation of the plunger pump, which plays a role in lubrication and support. When the plunger pump rotates at a high speed, when the plunger 1 moves in the cylinder block 2, due to uneven oil support and centrifugal force at high speeds, it will cause the axis of the plunger 1 to be non - coincident with the axis of the plunger cavity of the cylinder block 2 during reciprocating motion in the cylinder block 2, resulting in eccentricity or overturning, and causing abnormal wear of the plunger pump. In the present invention, a three - axis pose control module 1 - 5 is installed in the plunger 1 to collect the pose of the plunger 1 in real time, and at the same time, the pose of the plunger 1 is analyzed in real time and the centroid distribution of the plunger 1 is adjusted in real time through feedback, so as to dynamically adjust the actual pose of the plunger 1 in the plunger cavity of the cylinder block 2 and adjust it from the eccentric and overturned state back to the balanced pose. The control and adjustment method of the centroid of the plunger 1 is as follows:

[0033] The three - axis pose control module 1 - 5 collects the real - time state of the overall motion pose of the plunger 1. At the same time, the drive control chip in the three - axis pose control module 1 - 5 performs real - time closed - loop pose feedback calculation, decouples the calculated pose feedback value into the current values required for each drive coil 1 - 7, and outputs the current. By adjusting the input current of the drive coil 1 - 7, its output electromagnetic force is adjusted, so as to adjust the motion state of the inertia moment regulator 1 - 6 in the annular cavity 1 - 8.

[0034] As Figure 6 Shown in (a) of, if the three - axis pose control module 1 - 5 detects that the plunger 1 is eccentric, if the eccentricity of the plunger 1 in the plunger cavity is e, but no overturning occurs, at this time, the plunger axis and the central axis of the plunger cavity are parallelly distributed. In order to reduce the eccentricity of the plunger, it is necessary to move the overall centroid of the plunger 1 towards the central axis of the plunger cavity. The driving current of each coil in the drive coil 1 - 7 is adjusted in real time through the lithium battery 1 - 2 to drive the inertia moment regulator 1 - 6 to rotate in the annular cavity 1 - 8; at the same time, the driving current of the drive coil 1 - 7 is periodically adjusted, so that the inertia moment regulator 1 - 6 receives an axial periodic thrust, so that it makes a reciprocating motion while rotating in the annular cavity 1 - 8. Under the combined drive of the rotational motion and reciprocating motion of the inertia moment regulator 1 - 6, it is ensured that the overall centroid of the plunger 1 shifts towards the central axis of the plunger cavity, thereby reducing the eccentricity distance. Among them, the relationship between the current intensity and the electromagnetic force in the drive coil 1 - 7 is as follows:

[0035]

[0036] In the formula, represents the electromagnetic force, I represents the current, L represents the equivalent length of the drive coil 1 - 7. For the coil form of sheet distribution, L represents the length of the coil, denotes the magnetic induction intensity. It can be seen from the relational expression that the current intensity has a linear relationship with the electromagnetic force. The greater the current, the greater the electromagnetic force received by the inertia moment regulator 1-6.

[0037] As Figure 6 shown in (b) of Figure 6 if the three-axis pose control module 1-5 detects that the plunger 1 overturns, the current intensity and electromagnetic distribution of the drive coil 1-7 are adjusted in real time through the lithium battery 1-2 to adjust the axial position and the attitude of the inertia moment regulator 1-6 in the annular cavity 1-8. In this embodiment, it is necessary to adjust the inertia moment regulator 1-6 to the position shown in (b) of

[0038] shown in (b) of

[0039] Those of ordinary skill in the art can understand that the above are only preferred examples of the invention and are not used to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, for those skilled in the art, they can still modify the technical solutions described in the foregoing examples, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, etc. made within the spirit and principle of the invention shall be included within the protection scope of the invention.

Claims

1. A plunger structure with active adjustment of motion posture, characterized in that, it includes: a plunger, a cylinder block, and a main shaft; the plunger includes: a lithium battery, a plunger magnetic induction charging coil, a three-axis posture control module, a moment of inertia regulator, a drive coil, an end cover, and a permanent magnet; a diversion oil passage is coaxially arranged at the center of the plunger, and a three-axis posture control module is fixedly connected in the diversion oil passage for real-time detection and control of the posture state of the plunger; a lithium battery is embedded at one end of the plunger close to the plunger head, the plunger magnetic induction charging coil is arranged on the surface of the lithium battery, and the lithium battery is connected to the three-axis posture control module; the three-axis posture control module can collect plunger posture data and perform closed-loop control; a ring-shaped cavity is coaxially arranged at one end of the plunger away from the plunger head, the end cover is installed at the bottom of the plunger to seal the ring-shaped cavity; the moment of inertia regulator is installed inside the ring-shaped cavity, and the moment of inertia regulator is designed with an asymmetric structure so that its rotation axis is on the central axis of the plunger, but the center of mass is not on the central axis of the plunger; a permanent magnet is fixedly connected to one end of the moment of inertia regulator close to the plunger head; there are multiple drive coils, which are circumferentially fixedly connected to the top of the ring-shaped cavity and are connected to the lithium battery, and each drive coil can be individually controlled; the plunger is installed in the plunger cavity inside the cylinder block, the cylinder block includes a cylinder block magnetic induction charging coil, the inner wall of the plunger cavity is arranged with a cylinder block magnetic induction charging coil, and its position corresponds to that of the plunger magnetic induction charging coil; the cylinder block is fixedly connected to the main shaft, and the power supply is electrically connected to the cylinder block magnetic induction charging coil.

2. The plunger structure with active adjustment of motion posture according to claim 1, characterized in that, the plunger further includes a surface protection layer for the plunger coil, and the surface protection layer for the plunger coil is arranged on the surface of the plunger magnetic induction charging coil for protecting the coil; the cylinder block further includes a surface protection layer for the cylinder block coil, and the surface protection layer for the cylinder block coil is arranged on the surface of the cylinder block magnetic induction charging coil for protecting the coil.

3. The plunger structure with active adjustment of motion posture according to claim 2, characterized in that, both the surface protection layer for the plunger coil and the surface protection layer for the cylinder block coil are made of rigid magnetic conductive materials.

4. The plunger structure with active adjustment of motion posture according to claim 1, characterized in that, the ring-shaped cavity is filled with oil liquid to increase the damping when the moment of inertia regulator moves inside it.

5. The plunger structure with active adjustment of motion posture according to claim 1, characterized in that, a cylinder block charging coil is arranged at the contact between the cylinder block and the main shaft, and the cylinder block charging coil is connected to the cylinder block magnetic induction charging coil through a wire; the main shaft includes a conductive slip ring and a charging electrode, the charging electrode is arranged at one end of the main shaft and is electrically connected to the power supply; the conductive slip ring is installed on the main shaft and is electrically connected to the charging electrode and the cylinder block charging coil respectively.

6. The plunger structure with active adjustment of motion posture according to claim 1, characterized in that, The three-axis pose control module includes an inertial acceleration sensor and a drive control chip. The inertial acceleration sensor is used to collect the attitude position information of the plunger, and the drive control chip is used to implement the closed-loop feedback control of the plunger attitude.

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