Hydraulic control pump, control method of hydraulic control pump and vibration excitation system

Abstract

The present invention relates to the field of pump technology, and discloses a hydraulic control pump, a control method for the hydraulic control pump, and an excitation system. The hydraulic control pump includes: a swash plate; a plunger; a cylinder drive shaft for driving the plunger to rotate; a plurality of plunger chambers rotationally symmetrical with the axis of the cylinder drive shaft as the center; an angle adjustment mechanism for adjusting the inclination of the swash plate; each plunger chamber is equipped with an oil suction / discharge port, and each oil suction / discharge port is equipped with a waist-shaped groove corresponding thereto and arranged on the cylinder. On the one hand, there will be no relative movement between the oil suction / discharge port and the waist-shaped groove of each plunger chamber, thereby making the liquid flow change smoothly without step mutations, and the flow pulsation approaches zero. The problem of large flow pulsation caused by the relative movement of the rotating distribution plate relative to the cylinder plunger chamber in the prior art of the hydraulic control pump is solved. On the other hand, the rotating distribution plate and its driving machine are omitted, the overall structure of the device is simplified, and the production cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and in particular to a hydraulic control pump, a control method of the hydraulic control pump and an excitation system. Background Art

[0002] Vibration excitation systems are widely used in various fields. In the field of engineering vibration at home and abroad, electro-hydraulic vibration technology is widely used in vehicles, construction, ocean, aerospace, nuclear industry and other industries due to its greater advantages such as high power density, large displacement and thrust, and multiple controllable parameters.

[0003] The widely used electro-hydraulic vibration equipment is mainly divided into servo valve-controlled vibration equipment and rotary valve-controlled vibration equipment. The former can obtain high-quality vibration waveforms under low-frequency vibration through advanced control strategies, while the latter has greater advantages in the field of high-frequency vibration. However, both have disadvantages such as large throttling and overflow losses at the valve and low energy utilization, which greatly increases energy consumption costs.

[0004] For the existing alternating flow distribution technology, there are problems such as large flow pulsation caused by the relative movement of the rotating distribution plate with respect to the cylinder plunger cavity, and the need to increase the rotating distribution plate and its driving machine, which leads to complex pump structure and increased costs (for example, the invention patent with authorization announcement number CN104763604B discloses an alternating flow distribution pump for controlling a hydraulic excitation system). Summary of the invention

[0005] The applicant has found that in the invention patent with the authorization announcement number CN104763604B, since each plunger cavity and the A and B grooves of the rotating distributor plate will rotate relative to each other, a large flow pulsation phenomenon is generated. However, when there is no relative rotation between each plunger cavity and the A and B grooves of the rotating distributor plate, that is, when the rotation speed of the distributor plate is consistent with the rotation speed of the cylinder body (such as Figure 6 and Figure 7 As shown in the figure, the plungers on each distribution channel that provide liquid flow supply are fixed, the liquid flow changes smoothly, there is no step mutation, and the flow pulsation approaches zero. In this case, the entire device is in the best working state.

[0006] Therefore, the purpose of the present invention is to solve the problems in the prior art of hydraulic control pumps, such as large flow pulsation caused by the relative movement of the rotating distribution plate with respect to the cylinder plunger chamber, and the need to increase the rotating distribution plate and its driving machine, which leads to complex pump structure and increased cost.

[0007] In order to achieve the above object, the present invention provides a hydraulic control pump in a first aspect, comprising:

[0008] Swash plate;

[0009] A plunger, one end of which extends into the plunger cavity of the cylinder body and the other end of which is capable of performing circular motion on the working surface of the swash plate around the axis of the swash plate;

[0010] A cylinder drive shaft is rotatably connected to the support seat, is spherically connected to the center of the working surface of the swash plate, is coaxially and fixedly connected to the cylinder, and is used to drive the plunger to rotate so that the plunger reciprocates in the plunger cavity to form an oil suction area and an oil discharge area with fixed phases; the plurality of plunger cavities are rotationally symmetrical with the axis of the cylinder drive shaft as the center;

[0011] An angle adjustment mechanism, used to adjust the angle between the axis of the swash plate and the cylinder drive shaft;

[0012] Each of the plunger cavities is equipped with an oil suction / discharge port, and each of the oil suction / discharge port is equipped with a waist-shaped groove corresponding thereto and arranged on the cylinder body; a plurality of the waist-shaped grooves form an inner circle waist-shaped groove group and an outer circle waist-shaped groove group; the inner circle waist-shaped groove group and the outer circle waist-shaped groove group are distributed on two circular arcs of different radii on the right end face of the cylinder body; the two circular arcs of different radii are respectively configured with an inner distribution channel and an outer distribution channel arranged on the support seat.

[0013] Through the above arrangement, on the one hand, there will be no relative movement between the suction / discharge port of each plunger cavity and the waist groove, so that the liquid flow changes smoothly, without step mutation, and the flow pulsation approaches zero. The problem of large flow pulsation caused by the relative movement of the rotating distribution plate relative to the cylinder plunger cavity in the hydraulic control pump in the prior art is solved. On the other hand, the rotating distribution plate and its driving machine are omitted, which simplifies the overall structure of the device and greatly reduces the production cost.

[0014] Furthermore, the number of the plunger cavities is an even number.

[0015] Furthermore, the inner ring waist-shaped groove group and the outer ring waist-shaped groove group are relatively distributed on the right end surface of the cylinder body; the inner ring waist-shaped groove group and the outer ring waist-shaped groove group respectively include three waist-shaped grooves.

[0016] Further, two opposite waist-shaped grooves in the inner ring waist-shaped groove group and the outer ring waist-shaped groove group are located on the same radial line of the cylinder body;

[0017] Furthermore, the areas occupied by the inner ring waist-shaped groove group and the outer ring waist-shaped groove group are 360° complementary in angle.

[0018] Furthermore, an annular track coaxially arranged with the swash plate is arranged on the working surface of the swash plate, and a spherical slider hinged to the plunger is arranged at the head end of the plunger connected to the swash plate; the spherical slider is located in the annular track.

[0019] Furthermore, the angle adjustment mechanism comprises:

[0020] A variable plunger, wherein the swash plate is connected to an outer side wall of the variable plunger;

[0021] A variable screw rod, threadedly connected to the variable plunger in the axial direction;

[0022] The variable motor is used to drive the variable screw to rotate.

[0023] A second aspect of the present invention provides a vibration excitation system, comprising the hydraulic control pump.

[0024] The excitation system adopts an alternating distribution pump of the cylinder drive shaft to drive the actuator, utilizes the rotation of the cylinder to directly output alternating fluid flow, controls the excitation frequency by changing the cylinder speed, controls the comprehensive displacement and thus the excitation amplitude by adjusting the swash plate angle; the advantage of the entire control pump is that compared with the existing technology, it reduces the rotating distribution plate and its driving part, avoids the use of an excitation control valve, reduces flow pulsation, simplifies the structure, and saves costs.

[0025] The third aspect of the present invention provides a control method for the hydraulic control pump, which drives the cylinder drive shaft to rotate through the main motor, thereby driving the waist groove and the plunger cavity to rotate together.

[0026] Through the above arrangement, on the one hand, there will be no relative movement between the suction / discharge port of each plunger cavity and the waist groove, so that the liquid flow changes smoothly, without step mutation, and the flow pulsation approaches zero. The problem of large flow pulsation caused by the relative movement of the rotating distribution plate relative to the cylinder plunger cavity in the hydraulic control pump in the prior art is solved. On the other hand, the rotating distribution plate and its driving machine are omitted, which simplifies the overall structure of the device and greatly reduces the production cost.

[0027] Furthermore, the inclination angle of the swash plate is adjusted by the angle adjustment mechanism, thereby changing the stroke of the plunger and thus changing the pump displacement.

[0028] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front cross-sectional view of the hydraulic control pump of the present invention;

[0030] Figure 2 yes Figure 1 Section view along AA;

[0031] Figure 3a It is a schematic diagram of the right end face of the cylinder body;

[0032] Figure 3b yes Figure 3aA schematic cross-sectional view of the cut position shown;

[0033] Figure 3c It is a schematic diagram of the left end face of the cylinder body;

[0034] Figure 4 It is a schematic diagram of the left end surface of the support base of the present invention;

[0035] Figure 5 It is a schematic diagram of the working principle of the present invention;

[0036] Figure 6 and Figure 7 It is a schematic diagram of the relationship between the distribution plate speed, cylinder speed and flow pulsation.

[0037] Description of Reference Numerals

[0038] 1 cylinder drive shaft; 2 drive shaft bearing; 3 support seat; 4 cylinder; 5 plunger; 6 pump housing; 7 cylinder bearing; 8 swash plate; 9 variable plunger; 10 variable screw rod; 11 variable plug cover; 12 variable motor. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" usually refer to the orientation in the assembled state. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] A first aspect of the present invention provides a hydraulic control pump, such as Figure 1 , Figure 2 , Figure 3a , Figure 3b and Figure 3c As shown, the hydraulic control pump includes: a swash plate 8, a plunger 5, a waist-shaped groove, a cylinder drive shaft 1 and an angle adjustment mechanism.

[0043] Among them, one end of the plunger 5 extends into the plunger cavity of the cylinder body 4, and the other end can make a circular motion around the axis of the swash plate 8 on the working surface of the swash plate 8. In an optional specific embodiment, the working surface of the swash plate 8 is provided with an annular track coaxially arranged with the swash plate 8, and the head end of the plunger 5 connected to the swash plate 8 is provided with a spherical slider hinged to the plunger 5; the spherical slider is located in the annular track. The sliding connection between the plunger 5 and the swash plate 8 is achieved through such a structure.

[0044] The cylinder drive shaft 1 is rotatably connected to the support seat 3, is spherically connected to the working surface center of the swash plate 8, and is coaxially and fixedly connected to the cylinder 4, and is used to drive the plunger 5 to rotate, so that the plunger 5 reciprocates in the plunger cavity to form a phase-fixed oil suction area and oil discharge area; the multiple plunger cavities are rotationally symmetrical around the axis of the cylinder drive shaft 1.

[0045] Each of the plunger cavities is equipped with an oil suction / discharge port, and each of the oil suction / discharge port is equipped with a waist-shaped groove corresponding thereto and arranged on the cylinder body 4. A plurality of waist-shaped grooves form an inner ring waist-shaped groove group 13b and an outer ring waist-shaped groove group 13a. The inner ring waist-shaped groove group 13b and the outer ring waist-shaped groove group 13a are distributed on two arcs of different radii on the right end face of the cylinder body 4 and rotate with the cylinder body 4. The two arcs of different radii are respectively provided with an inner distribution channel I and an outer distribution channel II arranged on the support seat 3. In other words, the inner ring waist-shaped groove group 13b is connected to the inner distribution channel I, and the outer ring waist-shaped groove group 13a is connected to the outer distribution channel II. Among them, the inner distribution channel I and the outer distribution channel II are both fluid channels of annular structure.

[0046] The angle adjustment mechanism is used to adjust the angle between the axis of the swash plate 8 and the cylinder drive shaft 1. In an optional specific embodiment, the angle adjustment mechanism includes a variable plunger 9, a variable screw 10, a variable motor 12 and a variable plug cover 11. The swash plate 8 is connected to the outer wall of the variable plunger 9. The variable screw 10 is threadedly connected to the variable plunger 9 in the axial direction of the variable screw 10. The variable motor 12 is used to drive the variable screw 10 to rotate. Figure 1 As shown, when the variable lead screw 10 rotates forward, the variable plunger 9 moves downward, and since the swash plate 8 is connected to the outer side wall of the variable plunger 9, the inclination angle of the swash plate 8 changes.

[0047] It should be noted that the “inclination angle of the swash plate 8 ” herein refers to the angle between the axis of the swash plate 8 and the axis of the cylinder drive shaft 1 .

[0048] In a preferred specific embodiment, the number of plunger cavities is set to an even number, such as 6, 8, or 12. Correspondingly, the number of plungers and waist-shaped grooves is also an even number and the number is the same. The inner circle waist-shaped groove group 13b and the outer circle waist-shaped groove group 13a are relatively distributed on the right end surface of the cylinder body 4. The inner circle waist-shaped groove group 13b and the outer circle waist-shaped groove group 13a respectively include three waist-shaped grooves. Further, the two opposite waist-shaped grooves in the inner circle waist-shaped groove group 13b and the outer circle waist-shaped groove group 13a are located on the same diameter line of the cylinder body 4. Preferably, the areas occupied by the inner circle waist-shaped groove group 13b and the outer circle waist-shaped groove group 13a are complementary in angle at 360°.

[0049] In another optional specific implementation, the number of the plunger cavities is not necessarily an even number, and the sizes of the waist-shaped grooves are not necessarily the same, but it is necessary to ensure that the overall areas of the inner ring waist-shaped groove group 13b and the outer ring waist-shaped groove group 13a are the same.

[0050] In actual work, Figure 4 As shown, the motor connected to the cylinder drive shaft 1 drives the plunger cylinder 4 to rotate continuously. Due to the action of the swash plate 8, the plunger 5 is forced to reciprocate in the plunger cylinder 4, thereby forming a phase-fixed oil suction area and oil discharge area. At the same time, the rotation of the cylinder 4 causes the contact area between the inner and outer flow distribution channels of the support seat 3 and the oil suction area and oil discharge area of ​​the plunger cylinder to change.

[0051] like Figure 5 As shown, the zero point of the rotation angle of the plunger cylinder 4 is defined, that is, The contact area of ​​the inner distribution channel A is the same as that of the oil suction area and the oil discharge area of ​​the plunger cylinder 4, and the contact area of ​​the outer distribution channel II is the same as that of the oil suction area and the oil discharge area of ​​the plunger cylinder 4, that is, the input flow of the inner distribution channel I and the output flow of the outer distribution channel II are zero. With the rotation of the cylinder 4, the input and output flow of the alternating distribution pump hydraulic control pump changes as follows:

[0052] The contact area between the inner flow distribution channel I and the oil discharge area of ​​the cylinder body 4 and the contact area between the outer flow distribution channel II and the oil suction area of ​​the cylinder body 4 gradually increase, that is, the output flow of the inner flow distribution channel I and the input flow of the outer flow distribution channel II increase at the same time.

[0053] The output flow of the inner distribution channel I and the input flow of the outer distribution channel II reach the maximum; The contact area between the inner flow distribution channel I and the oil discharge area of ​​the cylinder body 4 and the contact area between the outer flow distribution channel II and the oil suction area of ​​the cylinder body 4 gradually decrease, that is, the output flow of the inner flow distribution channel I and the input flow of the outer flow distribution channel II decrease at the same time;

[0054] The output flow of the inner flow distribution channel I and the input flow of the outer flow distribution channel II are reduced to zero;

[0055] The contact area between the external flow distribution channel II and the oil discharge area of ​​the plunger cylinder 4 and the contact area between the internal flow distribution channel I and the oil suction area of ​​the plunger cylinder 4 gradually increase, that is, the output flow of the external flow distribution channel II and the input flow of the internal flow distribution channel I increase at the same time;

[0056] The output flow of the external distribution channel B and the input flow of the internal distribution channel A reach the maximum;

[0057] The contact area between the external flow distribution channel II and the oil discharge area of ​​the plunger cylinder 4 and the contact area between the internal flow distribution channel I and the oil suction area of ​​the plunger cylinder 4 gradually decrease, that is, the output flow of the external flow distribution channel B and the input flow of the internal flow distribution channel I decrease at the same time;

[0058] The output flow of the external flow distribution channel II and the input flow of the internal flow distribution channel I are reduced to zero;

[0059] In this way, the two oil ports of the alternating flow distribution pump will form oil with alternating flow and direction, thereby driving the exciting cylinder to reciprocate.

[0060] After the hydraulic control pump is applied to the excitation system, on the one hand, there will be no relative movement between the suction / discharge port of each plunger cavity and the waist-shaped groove, so that the liquid flow changes smoothly, without step mutations, and the flow pulsation approaches zero. The problem of large flow pulsation caused by the relative movement of the rotating distribution plate with respect to the cylinder plunger cavity in the hydraulic control pump in the prior art is solved. At the same time, the rotating distribution plate and its driving machine are omitted, the overall structure of the device is simplified, and the production cost is greatly reduced. On the other hand, the cylinder body 4 can be used to rotate to directly output the alternating liquid flow, and the excitation frequency can be controlled by changing the rotation speed of the cylinder body 4. The comprehensive displacement is controlled by adjusting the inclination angle of the inclined plate 8 to control the excitation amplitude. Compared with the prior art, the entire hydraulic control pump reduces the rotating distribution plate and its driving part, avoids the use of an excitation control valve, reduces flow pulsation, simplifies the structure, and saves costs.

[0061] Therefore, the problem that the relative movement of the rotating distribution plate with respect to the cylinder plunger chamber causes large flow pulsation in the hydraulic control pump in the prior art, and the need to increase the rotating distribution plate and its driving machine resulting in complicated pump structure and increased cost is solved.

[0062] The second aspect of the present invention provides a vibration excitation system, including the hydraulic control pump. The vibration excitation system uses an alternating distribution pump of a cylinder drive shaft to drive the actuator, directly outputs alternating fluid flow by rotating the cylinder, controls the excitation frequency by changing the cylinder speed, and controls the comprehensive displacement by adjusting the swash plate angle to control the excitation amplitude; the advantage of the entire control pump is that compared with the existing technology, it reduces the rotating distribution plate and its driving part, avoids the use of an excitation control valve, reduces flow pulsation, simplifies the structure, and saves costs.

[0063] The third aspect of the present invention provides a hydraulic control pump control method for executing the hydraulic control pump, which drives the cylinder drive shaft 1 to rotate through the main motor, driving the waist groove and the plunger cavity to rotate together. Since the waist groove and the plunger cavity rotate together, no relative movement occurs between the two. In this working state, the liquid flow changes most smoothly, without step mutations, and the flow pulsation approaches zero. Through this technical solution, the problems of large flow pulsation caused by the relative movement of the rotating distribution plate with respect to the cylinder plunger cavity in the hydraulic control pump in the prior art and the need to increase the rotating distribution plate and its driving machine, which leads to complex pump structure and increased cost, are solved.

[0064] Furthermore, the inclination angle of the swash plate 8 can be adjusted by an angle adjustment mechanism to change the stroke of the plunger 5 and thus change the pump displacement.

[0065] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0067] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A hydraulic control pump, characterized in that: include: A swash plate (8), wherein a circular track coaxially arranged with the swash plate (8) is arranged on the working surface of the swash plate (8), and a spherical slider articulated with the plunger (5) is arranged at the head end of the plunger (5) connected to the swash plate (8); the spherical slider is located in the circular track; A plunger (5), one end of which extends into the plunger cavity of the cylinder body (4), and the other end of which is capable of performing circular motion on the working surface of the swash plate (8) around the axis of the swash plate (8); The cylinder drive shaft (1) is rotatably connected to the support seat (3), is spherically connected to the working surface center of the swash plate (8), and is coaxially and fixedly connected to the cylinder body (4), and is used to drive the plunger (5) to rotate, so that the plunger (5) reciprocates in the plunger cavity to form an oil suction area and an oil discharge area with fixed phases; The plurality of plunger chambers are rotationally symmetrical with the axis of the cylinder drive shaft (1) as the center; An angle adjustment mechanism, used for adjusting the angle between the axis of the swash plate (8) and the cylinder drive shaft (1); Each of the plunger cavities is equipped with an oil suction / discharge port, and each of the oil suction / discharge port is equipped with a waist-shaped groove corresponding thereto and arranged on the cylinder body (4); a plurality of the waist-shaped grooves form an inner circle waist-shaped groove group (13b) and an outer circle waist-shaped groove group (13a); the inner circle waist-shaped groove group (13b) and the outer circle waist-shaped groove group (13a) are distributed on two circular arcs of different radii on the right end face of the cylinder body (4) and rotate together with the cylinder body (4); the two circular arcs of different radii are respectively equipped with an inner flow distribution channel (I) and an outer flow distribution channel (II) arranged on the support seat (3).

2. The hydraulic control pump according to claim 1, characterized in that: The number of the plunger cavities is an even number.

3. The hydraulic control pump according to claim 1, characterized in that: The inner ring waist-shaped groove group (13b) and the outer ring waist-shaped groove group (13a) are relatively distributed on the right end surface of the cylinder body (4); the inner ring waist-shaped groove group (13b) and the outer ring waist-shaped groove group (13a) respectively include three waist-shaped grooves.

4. The hydraulic control pump according to claim 3, characterized in that: Two opposing waist-shaped grooves in the inner ring waist-shaped groove group (13b) and the outer ring waist-shaped groove group (13a) are located on the same radial line of the cylinder body (4).

5. The hydraulic control pump according to claim 4, characterized in that: The areas occupied by the inner ring waist groove group (13b) and the outer ring waist groove group (13a) are complementary in angle of 360°.

6. The hydraulic control pump according to claim 1, characterized in that: The angle adjustment mechanism comprises: A variable displacement plunger (9), wherein the swash plate (8) is connected to an outer side wall of the variable displacement plunger (9); A variable screw rod (10) is threadedly connected to the variable plunger (9) in the axial direction thereof; The variable motor (12) is used to drive the variable screw rod (10) to rotate.

7. A vibration excitation system, characterized in that: A hydraulic control pump comprising any one of claims 1-6.

8. A control method for executing the hydraulic control pump according to any one of claims 1 to 6, characterized in that: The main motor drives the cylinder driving shaft (1) to rotate, thereby driving the waist-shaped groove and the plunger cavity to rotate together.

9. The control method of the hydraulic control pump according to claim 8, characterized in that: The inclination angle of the swash plate (8) is adjusted by an angle adjustment mechanism, thereby changing the stroke of the plunger (5) and thus changing the pump displacement.

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