Damping vibration attenuation system of engineering machinery and engineering machinery

Abstract

The invention relates to a damping vibration attenuation system of engineering machinery, which comprises an upper rack (10) used for being connected with an operation machine tool (70) of the engineering machinery; the lower rack (20) is used for being connected with a cab (60) of the engineering machinery and is positioned below the upper rack; and the damping vibration attenuation mechanism (30) is arranged between the upper rack (10) and the lower rack (20) and comprises an eddy current damper (31), and the eddy current damper (31) is configured to be used for absorbing vibration between the upper rack (10) and the lower rack (20).

Description

Technical Field

[0001] The present disclosure relates to the technical field of vibration reduction and vibration isolation in the field of engineering machinery, and in particular to a damping vibration reduction system of engineering machinery and the engineering machinery. Background Art

[0002] With the development of construction machinery technology, the vibration reduction and comfort performance of construction machinery products are important indicators of product competitiveness and brand influence. As the main source of vibration of construction machinery, the working tools will produce complex vibrations during the operation of construction machinery due to the impact brought by the hydraulic cylinder and the interaction with the construction medium.

[0003] Conventional shock absorbers are usually used for vibration isolation of construction machinery. The function of conventional shock absorbers is to block and weaken the transmission of vibration energy from the vibration source to the frame and from the frame to the cab, accelerate the attenuation of vibration, improve the vibration fatigue of parts and improve the comfort of operators. However, the inventors found that the work tools are directly connected to the frame through the integral frame, or are connected to each other through rubber suspension, rubber pads, etc., and the vibration generated by the work tools is transmitted to the frame through the lower frame and then to the cab.

[0004] However, the current construction machinery and tools do not have a vibration isolation system or the vibration isolation effect of the shock absorber is poor, and the low-frequency vibration generated by the instantaneous impact during operation cannot be effectively isolated. The required shock absorber performance is ideally high stiffness and high damping, but it is difficult to achieve for traditional shock absorbers. At present, there are still low-frequency vibrations that cause the human body to be more sensitive.

[0005] The inventors believe that the current vibration reduction method is single and mainly focuses on isolating translational vibrations. Not only is it difficult to be effective against rotational vibrations, but it is also unable to effectively isolate low-frequency vibrations generated by instantaneous impacts during operation. The vibration comfort is poor and it is easy for components to twist or break and fail, thus affecting the safety of construction machinery. Summary of the invention

[0006] In order to improve the above technical defects, the present disclosure provides a damping and vibration reduction system for engineering machinery, comprising:

[0007] An upper frame configured to be connected to a work tool of the construction machine;

[0008] a lower frame, configured to be connected to a cab of an engineering machine and located below the upper frame; and

[0009] The damping vibration reduction mechanism is arranged between the upper frame and the lower frame, and comprises an eddy current damper, wherein the eddy current damper is configured to absorb vibration between the upper frame and the lower frame.

[0010] In some embodiments, the damping of the eddy current damper is adjustable.

[0011] In some embodiments, the damping and vibration reduction mechanism further includes an elastic member, and the elastic member is supported by the lower frame and supports the upper frame.

[0012] In some embodiments, the vibration reduction system includes:

[0013] a plurality of upper support members arranged at intervals between the upper frame and the top of the elastic member to separate the upper frame from the elastic member; and

[0014] a plurality of lower support members arranged at intervals between the lower frame and the bottom of the elastic member to separate the lower support and the elastic member;

[0015] The upper support member and the lower support member are configured as damping shock absorbers.

[0016] In some embodiments, the eddy current damper includes at least one damping vibration reduction unit, each of which includes:

[0017] an inner magnetic member, arranged on the outer periphery of the elastic member;

[0018] an outer magnetic member spaced apart from the elastic member to form a magnetic field between the inner magnetic member and the outer magnetic member; and

[0019] The conductor member is arranged between the inner magnetic member and the outer magnetic member so as to form eddy current therein under the action of the magnetic field.

[0020] In some embodiments, the damping and vibration reduction system includes a plurality of damping and vibration reduction units arranged at intervals along the outer circumference of the elastic member.

[0021] In some embodiments, the plurality of damping and vibration reduction units include at least one pair of damping and vibration reduction units, and each pair of the damping and vibration reduction units includes two damping and vibration reduction units that are substantially symmetrically arranged relative to the center of the elastic member.

[0022] In some embodiments, the at least one pair of damping units includes at least one of the following:

[0023] a pair of the vibration damping units, respectively arranged at both ends of the elastic member in the longitudinal direction; and

[0024] Another pair of the damping and vibration reduction units are respectively arranged at two lateral ends of the elastic member.

[0025] In some embodiments, some of the plurality of damping and vibration reduction units are arranged above and / or below the elastic member to absorb vibrations in the same direction as the elastic member, and the remaining plurality of damping and vibration reduction units are arranged on the lateral circumferential portion of the elastic member to absorb vibrations in a direction different from the vibrations absorbed by the elastic member; or

[0026] The plurality of vibration damping units are all arranged at intervals on a lateral circumferential portion of the elastic member to absorb vibrations in a direction different from the vibrations absorbed by the elastic member.

[0027] In some embodiments, the inner magnetic member is embedded in a circumferential portion of the elastic member.

[0028] In some embodiments, the inner magnetic member and the outer magnetic member are made of permanent magnetic material or strong magnetic material.

[0029] In some embodiments, the outer magnetic member and the conductive member are arranged against each other.

[0030] In some embodiments, the spacing between the inner magnetic member and the conductive member is adjustable.

[0031] In some embodiments, in the same damping and vibration reduction unit, the distance between the inner magnetic member and the conductor member varies.

[0032] In some embodiments, the spacing is configured as one of the following:

[0033] The spacing is gradually increasing;

[0034] The spacing is gradually decreasing all the time;

[0035] The spacing at least partially increases first and then decreases; and

[0036] The distance at least partially decreases first and then increases.

[0037] In another aspect, the present disclosure provides an engineering machine, comprising the above-mentioned damping and vibration reduction system, wherein the engineering machine comprises:

[0038] A cab is connected to the upper frame, and another damping vibration reduction mechanism is also provided between the cab and the upper frame to absorb vibration therebetween;

[0039] The working tool is connected to the lower frame, and another damping vibration reduction mechanism is also arranged between the working tool and the lower frame to absorb the vibration therebetween.

[0040] The embodiment of the present disclosure effectively absorbs the low-frequency vibration generated during the operation of the construction machinery by arranging an eddy current damper between the upper frame and the lower frame. In addition, through the combination of the eddy current damper and the elastic member, the eddy current damper reduces the low-frequency vibration, and the elastic member reduces the high-frequency vibration, thus achieving a full-band vibration reduction effect and improving the riding comfort of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0042] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0043] Figure 1 is a schematic structural diagram showing an engineering machine according to an embodiment of the present disclosure;

[0044] Figure 2 is a schematic structural diagram showing a damping and vibration reduction system for an engineering machine according to an embodiment of the present disclosure; and

[0045] Figure 3 It is shown Figure 2 Cross-sectional view of the damping system in FIG.

[0046] Figure numerals: 10, upper frame; 20, lower frame; 30, damping vibration reduction mechanism; 31, eddy current damper; 310, damping vibration reduction unit; 311, inner magnetic part; 312, outer magnetic part; 313, conductor part; 32, elastic part; 40, upper support part; 50, lower support part; 60, cab; 70, working tool; 80, hydraulic power part; 90, frame; 91, upper connecting part; 92, lower connecting part; 93, cab vibration reduction part. DETAILED DESCRIPTION

[0047] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0048] The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. Words such as "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Longitudinal" is the direction of travel of the engineering machinery, and "lateral" is the width direction of the engineering machinery.

[0049] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0050] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0051] Figure 1 The engineering machinery 1 according to the embodiment of the present disclosure is shown. For example, an excavator is taken as an example. The excavator includes a cab 60, a work tool 70, a hydraulic cylinder 80 and a frame 90. The cab 60 is installed above the frame 90, the frame 90 is connected to the upper frame 10, and the lower frame 20 is connected to the hydraulic cylinder 80 and the work tool 70, and is located below the upper frame 10. In order to isolate and absorb the vibration between the work tool and the hydraulic cylinder and the cab, a damping vibration reduction system is provided between the work tool and the hydraulic cylinder and the cab. The damping vibration reduction system includes an upper frame 10, a lower frame 20, and a damping vibration reduction mechanism 30 arranged between the upper frame 10 and the lower frame 20. The damping vibration reduction mechanism 30 includes an eddy current damper 31 for absorbing low-frequency vibration between the upper frame 10 and the lower frame 20. Optionally, the damping of the eddy current damper 31 is adjustable so as to be adjusted as needed.

[0052] In some embodiments of the present disclosure, a first shock absorber 90 is provided between the cab 60 and the upper frame 10. The first shock absorber 90 may be a conventional shock absorber or another damping vibration reduction mechanism 30. Another damping vibration reduction mechanism 30 may be provided between the hydraulic cylinder 80 and the working tool 70 and the lower frame 20. In this way, the vibration of the cab is significantly reduced through the multi-stage vibration reduction system, and the riding comfort of the driver is improved.

[0053] In some embodiments of the present disclosure, Figure 2 and 3 As shown, the damping vibration reduction mechanism 30 includes an elastic member 32, which is located between the upper frame 10 and the lower frame 20 and is used to absorb high-frequency vibration between the upper frame 10 and the lower frame 20. The elastic member 32 plays a role of supporting the upper frame 10 on the one hand, and is supported by the lower frame 20 on the other hand; the cross section of the elastic member 32 can be elliptical, and the shape of the elastic member 32 is an ellipsoid, or other shapes such as a sphere, and the surfaces of the upper frame 10 and the lower frame 20 opposite to the elastic member 32 can be arranged to match the outer peripheral shape of the elastic member 32.

[0054] In some embodiments of the present disclosure, Figure 3 As shown, a plurality of spaced-apart upper support members 40 are arranged between the upper frame 10 and the elastic member 32 to space the upper frame 10 and the elastic member 32 apart; a plurality of spaced-apart lower support members 50 are arranged between the lower frame 20 and the elastic member 32 to space the lower support 20 and the elastic member 32 apart, thereby avoiding direct contact and friction between the upper frame 10 and the elastic member 32, and avoiding direct contact and friction between the lower frame 20 and the elastic member 32, which is beneficial to maintaining the integrity and durability of the elastic member 32. The upper support member 40 and the lower support member 50 are damping shock absorbers, which transmit the vibration impact transmitted from the upper frame 10 to the lower frame 20 through the elastic member 32 in a dispersed manner through multiple upper support members 40 and multiple lower support members 50. On the other hand, the upper support member 40 and the lower support member 50, which themselves serve as damping shock absorbers, can also absorb the vibration impact and buffer the vibration impact to avoid excessive local pressure. Optionally, the damping of the damping shock absorber is adjustable, and the damping size can be adjusted according to different working conditions.

[0055] In some embodiments of the present disclosure, the eddy current damper 31 includes at least one damping vibration reduction unit 310, each of which includes: an inner magnetic member 311, arranged at the outer periphery of the elastic member 32; an outer magnetic member 312, spaced from and arranged relative to the inner magnetic member 311, so as to form a magnetic field between the inner magnetic member 311 and the outer magnetic member 312; and a conductor member 313, arranged between the inner magnetic member 311 and the outer magnetic member 312, for forming a magnetic field under the action of the magnetic field. Eddy currents are formed therein; when the working tool 2 generates a vibration impact, the vibration impact will be transmitted to the elastic part 32, causing the elastic part 32 to move, resulting in a change in the magnetic field between the inner magnetic part 311 and the outer magnetic part 312, thereby forming eddy currents in the conductor part 313. The eddy currents generate an electromagnetic field with a polarity opposite to that of the magnetic field of the inner magnetic part 311. The two magnetic fields with opposite polarities hinder each other's movement, generating an eddy current damping effect, and the movement of the elastic part 32 is hindered, and the kinetic energy of the elastic part 32 is converted into heat energy generated by eddy current heat.

[0056] In some embodiments of the present disclosure, Figure 3 As shown, multiple damping vibration reduction units 310 are arranged at intervals on the lateral periphery of the elastic member 32. The multiple damping vibration reduction units 310 may be evenly arranged along the lateral periphery to absorb vibration impacts in directions other than the vertical direction. The lateral periphery refers to other peripheries except the upper periphery of the elastic member 32 that forms a support with the upper frame 10 and the lower periphery of the elastic member 32 that forms a support with the lower frame 20. Optionally, multiple damping vibration reduction units 310 may be provided on both the upper periphery and the lower periphery of the elastic member 32 as auxiliary damping vibration reduction members for the elastic member 32, and absorb vibration impacts in the vertical direction together with the elastic member 32, thereby strengthening the absorption of low-frequency vibrations in the vertical direction.

[0057] In some embodiments of the present disclosure, the damping of the damping vibration reduction unit 310 is adjustable. The smaller the spacing between the inner magnetic part 311 and the conductor part 313, the greater the damping coefficient of the damping vibration reduction unit 310. By setting different spacings in the two damping vibration reduction units 310, two damping vibration reduction units 310 with different damping coefficients can be obtained. Optionally, in the same damping vibration reduction unit 310, by setting the spacing to be non-constant, different damping can be set at different positions, that is, in the same damping vibration reduction unit 310, along a certain direction, the spacing is variable, and the certain direction includes the vertical direction, the lateral circumferential direction and the circumferential direction of other directions; the spacing can be gradually increased all the time, the spacing can also be gradually decreased all the time, the spacing can also be at least partially increased first and then decreased, and the spacing can also be at least partially decreased first and then increased. In this way, the damping of the damping vibration reduction unit 310 can be flexibly adjusted as needed, and a combination of multiple damping vibration reduction units 310 with different damping can be formed. Optionally, the plurality of damping vibration reduction units 310 include at least one pair of damping vibration reduction units 310, and each pair of the damping vibration reduction units 310 includes two damping vibration reduction units 310 that are substantially symmetrically arranged relative to the center of the elastic member 32, for example, the two damping vibration reduction units 310 are respectively located at two ends in the longitudinal direction or two ends in the transverse direction. The two damping vibration reduction units 310 that are symmetrically arranged relative to the center of the elastic member 32 generate opposite forces and moments, which can resist not only translational vibration in the direction of the line connecting the two damping vibration reduction units 310, but also rotational vibration in the direction of the line connecting the two damping vibration reduction units 310.

[0058] In some embodiments of the present disclosure, the inner magnetic member 311 is embedded in the circumferential portion of the elastic member 32. When the elastic member 32 is manufactured, the inner magnetic member 311 is embedded in the elastic body 32 to form an integral body.

[0059] In some embodiments of the present disclosure, the inner magnetic member 311 and the outer magnetic member 312 may be made of permanent magnetic material or strong magnetic material. The strong magnetic material may be disconnectably connected to a power source. When the strong magnetic material is energized, its magnetic strength is increased.

[0060] In some embodiments of the present disclosure, the outer magnetic member 312 and the conductor member 313 are arranged against each other, which helps to increase the magnetic flux passing through the conductor member 313, further increasing the eddy current generated in the conductor member 313, thereby increasing the damping force on the inner magnetic member 311.

[0061] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A damping and vibration reduction system for engineering machinery, comprising: An upper frame (10) configured to be connected to a working tool (70) of an engineering machine; A lower frame (20) configured to be connected to a cab (60) of an engineering machine and located below the upper frame (10); as well as The damping vibration reduction mechanism (30) is arranged between the upper frame (10) and the lower frame (20), and comprises an eddy current damper (31), wherein the eddy current damper (31) is configured to absorb vibration between the upper frame (10) and the lower frame (20).

2. The damping vibration reduction system according to claim 1, wherein the damping of the eddy current damper (31) is adjustable.

3. The damping and vibration reduction system according to claim 1, wherein the damping and vibration reduction mechanism (30) further comprises an elastic member (32), wherein the elastic member (32) is supported by the lower frame (20) and supports the upper frame (10).

4. The vibration reduction system according to claim 3, comprising: A plurality of upper support members (40) are arranged at intervals between the upper frame (10) and the top of the elastic member (32) to separate the upper frame (10) from the elastic member (32); as well as A plurality of lower support members (50) are arranged at intervals between the lower frame (20) and the bottom of the elastic member (32) to separate the lower frame (20) and the elastic member (32); The upper support member (40) and the lower support member (50) are configured as damping shock absorbers.

5. The damping vibration reduction system according to claim 3, wherein the eddy current damper (31) comprises at least one damping vibration reduction unit (310), and each of the damping vibration reduction units (310) comprises: An inner magnetic member (311) arranged on the outer periphery of the elastic member (32); an outer magnetic member (312) spaced apart from the elastic member (32) so as to form a magnetic field between the inner magnetic member (311) and the outer magnetic member (312); as well as The conductor part (313) is arranged between the inner magnetic part (311) and the outer magnetic part (312) so as to form eddy currents therein under the action of a magnetic field.

6. The damping vibration reduction system according to claim 5, comprising a plurality of damping vibration reduction units (310) arranged at intervals along the outer circumference of the elastic member (32).

7. The damping vibration reduction system according to claim 6, wherein the plurality of damping vibration reduction units (310) include at least one pair of damping vibration reduction units (310), and each pair of the damping vibration reduction units (310) includes two damping vibration reduction units (310) that are substantially symmetrically arranged relative to the center of the elastic member.

8. The damping and vibration reduction system according to claim 7, wherein the at least one pair of damping and vibration reduction units (310) comprises at least one of the following: a pair of the damping vibration reduction units (310), respectively arranged at two longitudinal ends of the elastic member (32); and Another pair of the damping vibration reduction units (310) are respectively arranged at two lateral ends of the elastic member (32).

9. The vibration reduction system according to claim 6, wherein Some of the plurality of damping and vibration reduction units (310) are arranged above and / or below the elastic member (32) to absorb vibrations in the same direction as the elastic member (32), and the rest of the plurality of damping and vibration reduction units (310) are arranged on the lateral circumferential portion of the elastic member (32) to absorb vibrations in a direction different from the vibrations absorbed by the elastic member (32); or The plurality of vibration damping units (310) are all arranged at intervals on the lateral circumferential portion of the elastic member (32) to absorb vibrations in a direction different from the vibrations absorbed by the elastic member (32).

10. The vibration reduction system according to claim 5, wherein the inner magnetic member (311) is buried in the circumferential portion of the elastic member (32).

11. The damping vibration reduction system according to claim 5, wherein the inner magnetic component (311) and the outer magnetic component (312) are made of permanent magnetic material or strong magnetic material.

12. The vibration damping system according to claim 5, wherein the external magnetic member (312) and the conductor member (313) are arranged to abut against each other.

13. The vibration damping system according to claim 5, wherein the distance between the inner magnetic member (312) and the conductor member (313) is adjustable.

14. The damping and vibration reduction system according to claim 5, wherein in the same damping and vibration reduction unit (310), the distance between the inner magnetic member (312) and the conductor member (313) is variable.

15. The vibration damping system of claim 14, wherein the spacing is configured as one of the following: The spacing is gradually increasing; The spacing is gradually decreasing all the time; The spacing at least partially increases first and then decreases; and The distance at least partially decreases first and then increases.

16. An engineering machine, comprising the damping vibration reduction system according to any one of claims 1 to 15, the engineering machine comprising: A cab (60) connected to the upper frame (10), and another damping vibration reduction mechanism (30) is also provided between the cab (60) and the upper frame (10) to absorb vibration therebetween; The working tool (70) is connected to the lower frame (20), and another damping vibration reduction mechanism (30) is also provided between the working tool (70) and the lower frame (20) to absorb vibration therebetween.

Images