A vibration-reducing crankshaft and a vibration-reducing counterweight structure used in conjunction with the crankshaft

Abstract

The present invention relates to the field of crankshaft vibration reduction, and in particular to a vibration reduction crankshaft and a vibration reduction counterweight structure used in conjunction with the same, wherein the vibration reduction crankshaft includes a mounting shaft fixed to the end of the crankshaft, and a first cam, a first connecting rod shaft, a second cam, a main shaft, a third cam, a second connecting rod shaft, a counterweight shaft and a counterweight plate are fixed in series from the mounting shaft to the middle of the crankshaft in sequence, and the counterweight plate includes a cover plate and a mounting plate, and the mounting plate is composed of a plurality of adjustment structures uniformly distributed along the circumference, and the position of the adjustment column relative to the axis of the counterweight plate is adjusted by rotating the first screw in the adjustment structure, and the position of the center of mass of the entire crankshaft is adjusted by rotating the first screw in the plurality of adjustment structures. The present invention also realizes flexible and rapid adjustment of the crankshaft counterweight through the counterweight structure used in conjunction with the counterweight plate, saving operation time and reducing operation difficulty.

Description

Technical Field

[0001] The invention relates to the field of crankshaft vibration reduction, and in particular to a vibration-reducing crankshaft and a vibration-reducing counterweight structure used in conjunction with the crankshaft. Background Art

[0002] The setting of crankshaft vibration reduction is an important part of engine design and is crucial to the normal operation of the car. When the crankshaft rotates at high speed, it will generate huge centrifugal force due to its uneven shape and mass distribution. If this centrifugal force is not balanced, it will cause the engine to lose balance, generate vibration and noise, and even cause engine damage in severe cases. By setting counterweights on the crankshaft, part or all of the centrifugal force can be offset, so that the engine can remain balanced when rotating.

[0003] Currently, the commonly used crankshaft balancing methods include static balancing and dynamic balancing. The static balancing method is to add or adjust the mass and position of the counterweight block on the crankshaft to achieve the purpose of balancing the centrifugal force generated when the crankshaft rotates; the dynamic balancing method is a method of balancing and adjusting the crankshaft while it is rotating. This method usually uses a dynamic balancing machine to measure the imbalance of the crankshaft and automatically adjust the position and mass of the counterweight block to achieve a balanced state.

[0004] However, the above two balancing methods cannot be adapted to the balancing of various crankshafts, and tedious debugging and complex calculations are required during the crankshaft balancing process to meet the balance requirements of the crankshaft. In addition, depending on the position and mass of the final balancing weight, a lot of material resources and time are also required when calibrating and repairing the crankshaft. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a vibration-damping crankshaft and a vibration-damping counterweight structure used in conjunction therewith, which can meet the counterweight requirements of the crankshaft by flexibly adjusting the position of the counterweight structure and flexibly adding or subtracting the counterweight mass, and solve the low efficiency problem of crankshaft counterweighting in traditional methods. This is specifically achieved through the following technical solutions:

[0006] The present invention provides a vibration-damping crankshaft, comprising a mounting shaft, which is located at the end of the crankshaft. A first cam, a first connecting rod shaft, a second cam, a main shaft, a third cam, a second connecting rod shaft, a fourth cam, a counterweight shaft and a counterweight plate are fixed in sequence from the mounting shaft to the middle of the crankshaft.

[0007] The connecting rod shaft is used for installing the connecting rod, and the main shaft is used for installing the crankshaft. The installation shaft, main shaft, and counterweight shaft are coaxially arranged. The plane where the axis of the connecting rod shaft and the axis of the main shaft are located together is the symmetry plane of several of the cams, and both sides of the crankshaft are symmetrically distributed about the center of the counterweight plate.

[0008] The counterweight plate includes a cover plate and a mounting plate. The mounting plate is coaxially fixed with the counterweight shaft, and the cover plates are respectively mounted on both sides of the mounting plate.

[0009] The mounting plate is composed of a plurality of adjustment structures, wherein the adjustment structure includes a first screw rod, which is radially rotatably mounted on the mounting plate, the first screw rod is threadedly connected to an adjustment column, the adjustment column is arranged in a sliding groove and moves along the sliding groove, and the sliding groove is radially opened in the mounting plate.

[0010] The side surface of the adjusting column is fixed to the mounting plate, the mounting plate is arranged in the guide through hole and moves along the guide through hole, the guide through hole is opened on the mounting plate, and the mounting plate is installed with a counterweight block.

[0011] Preferably, a first through hole and a second through hole are provided on the mounting plate, and the first end of the first screw is rotatably mounted in a through groove provided between the first through hole and the second through hole, and a first washer and a first nut are sequentially installed on the middle portion of the first screw along the radial direction of the mounting plate from inside to outside, the first washer is sleeved on the outside of the first screw, the first nut is threadedly connected to the first screw, and the first washer and the first nut are arranged in the second through hole.

[0012] Preferably, the structure consisting of the mounting plate, the guide through holes and the counterweight block is symmetrically distributed in two groups about the center of the mounting plate.

[0013] Preferably, the bisectors of the first through hole and the second through hole coincide with each other, and the bisectors of the two coincide with the radial line of the mounting plate.

[0014] Preferably, one end of the sliding groove away from the axis of the mounting disk is connected to the outside of the mounting disk through an oil hole, and the oil hole is radially opened on the side of the mounting disk.

[0015] The present invention discloses a vibration-damping counterweight structure, comprising a counterweight plate, wherein the counterweight plate is fixed to a mounting plate, guide sliders are respectively fixed to both ends of the counterweight plate, the guide sliders are sealed in guide grooves and move along the guide grooves, and the guide grooves are provided on the end surface of the mounting plate.

[0016] The counterweight plate is provided with an adjustment slot, a counterweight slider sliding along the adjustment slot is arranged in the adjustment slot, and a plurality of counterweight bars are installed on the counterweight slider.

[0017] The counterweight slider is threadedly connected to the second screw, the first end of the second screw is rotatably mounted on the first end of the counterweight plate, the second end of the counterweight plate is provided with a fixing groove capable of sleeved with a fixing plate, the second end of the second screw passes through a through hole provided on the fixing plate and is sequentially installed with a second washer and a second nut, the second washer is sleeved on the outside of the second screw, and the second nut is threadedly connected to the second screw.

[0018] Preferably, a plurality of threaded holes are evenly arranged on the counterweight slider, a first positioning groove is arranged on the upper surface of the counterweight slider coaxially with the threaded holes, a positioning tube is fixed to the bottom of the counterweight bar, the positioning tube can be arranged in the first positioning groove and coaxially connected with the threaded holes, a second positioning groove is arranged on the top of the counterweight bar coaxially with the positioning tube, and the positioning tube of another counterweight bar can be sleeved in the second positioning groove.

[0019] Preferably, the structure consisting of the threaded holes and the first positioning grooves is symmetrically distributed in two groups about the center of the counterweight slider.

[0020] Preferably, the structure consisting of the positioning tube and the second positioning groove is symmetrically distributed in two groups about the center of the counterweight bar.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The present invention adjusts the center of mass of the counterweight plate by rotating the first screw in the multiple adjustment structures, thereby balancing the center of mass of the crankshaft, and realizing that the overall center of mass of the crankshaft is located on the axis of the main shaft, achieving rotational balance, and reducing vibration and noise.

[0023] 2. The present invention facilitates flexible and rapid adjustment of the crankshaft counterweight through a counterweight slider that can move radially perpendicular to the counterweight plate and a counterweight bar that can quickly adjust the position and increase or decrease the mass, thereby saving operation time and reducing operation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A three-dimensional diagram of a vibration-damped crankshaft;

[0026] Figure 2 It is the front view of the vibration reduction crankshaft;

[0027] Figure 3 This is a disassembly diagram of the counterweight plate;

[0028] Figure 4 for Figure 3 The cutaway front view of some of the components in the middle;

[0029] Figure 5 for Figure 4 A partially cutaway stereoscopic view of

[0030] Figure 6 It is a three-dimensional diagram of the vibration reduction counterweight structure;

[0031] Figure 7 for Figure 6 Schematic diagram of the cutaway and disassembly of

[0032] Figure 8 for Figure 7 Schematic diagram of the cutaway and disassembled parts of the parts;

[0033] Fig. 9 It is a schematic diagram of another combination installation of some parts in the vibration-damping counterweight structure.

[0034] Description of reference numerals:

[0035] 101-installation shaft, 102-cam, 103-connecting rod shaft, 104-main shaft, 105-counterweight shaft;

[0036] 200-weight plate, 201-cover plate, 202-mounting plate, 203-first through hole, 204-second through hole, 205-first screw rod, 206-first washer, 207-first nut, 208-adjusting column, 209-sliding groove, 210-mounting plate, 211-guide through hole, 212-oil hole;

[0037] 300-counterweight block, 301-counterweight plate, 302-guide slider, 303-guide groove, 304-adjusting groove, 305-counterweight slider, 306-second screw rod, 307-fixing plate, 308-second washer, 309-second nut, 310-counterweight bar, 311-threaded hole, 312-first positioning groove, 313-positioning tube, 314-second positioning groove. DETAILED DESCRIPTION

[0038] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0039] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] The embodiment of the present invention provides a vibration-damping crankshaft and a vibration-damping counterweight structure used in conjunction with the crankshaft. Figures 1 to 5 The vibration reduction crankshaft includes a mounting shaft 101, a cam 102, a connecting rod shaft 103, a main shaft 104, a counterweight shaft 105 and a counterweight plate 200. The mounting shaft 101 is located at the end of the crankshaft and is used for the rotational installation of the crankshaft. The mounting shaft 101, the first cam 102, the first connecting rod shaft 103, the second cam 102, the main shaft 104, the third cam 102, the second connecting rod shaft 103, the fourth The cam 102, the counterweight shaft 105 and the counterweight plate 200, the connecting rod shaft 103 are used for the rotation installation of the connecting rod, and the main shaft 104 is used for the rotation installation of the crankshaft, ensuring that the entire crankshaft rotates around the axis of the main shaft 104, the installation shaft 101, the main shaft 104, and the counterweight shaft 105 are coaxially arranged, and the plane where the axis of the connecting rod shaft 103 and the axis of the main shaft 104 are common is the symmetry plane of several cams 102, and the two sides of the crankshaft are symmetrically distributed about the center of the counterweight plate 200.

[0041] This structure ensures that each position of the crankshaft is symmetrically distributed relative to the axis of the main shaft 104, and the contour shape of the counterweight plate 200 is disc-shaped, and the counterweight plate 200 is coaxially fixed with the counterweight shaft 105, thereby maximally ensuring the balance and stability of the crankshaft.

[0042] The counterweight plate 200 includes a cover plate 201 and a mounting plate 202. The mounting plate 202 is coaxially fixed with the counterweight shaft 105. Cover plates 201 are coaxially mounted on both sides of the mounting plate 202 for protecting and hiding the counterweight structure mounted and distributed on the cover plate 201, thereby reducing the resistance during the rotation of the crankshaft.

[0043] Several adjustment structures with the same structure are evenly distributed along the circumference of the installation plate 202, such as Figure 4 As shown, the mounting disk 202 is respectively provided with a first through hole 203 and a second through hole 204, the bisectors of the first through hole 203 and the second through hole 204 coincide with each other, and the bisectors of the two coincide with the radial line of the mounting disk 202, and a through groove connecting the first through hole 203 and the second through hole 204 is provided in the gap between the first through hole 203 and the second through hole 204 along the radial direction of the mounting disk 202, and the first end of the first screw rod 205 is rotatably installed in the through groove, and the middle part of the first screw rod 205 is sequentially installed with a first washer 206 and a first nut 207 in the direction from close to the first through hole 203 to away from the first through hole 203, the first washer 206 is sleeved on the outside of the first screw rod 205, the first nut 207 is threadedly connected to the first screw rod 205, and the first washer 206 and the first nut 207 are arranged in the second through hole 204.

[0044] like Figure 5 As shown, the second end of the first screw rod 205 is threadedly connected to the adjusting column 208 , and the adjusting column 208 is sealingly slidably configured in the sliding groove 209 and can move along it. The sliding groove 209 is radially opened in the mounting plate 202 .

[0045] The side surface of the adjustment column 208 is fixed to the first end of the mounting plate 210 . The mounting plate 210 is arranged in and moves along the guide hole 211 . The guide hole 211 is radially opened on the mounting disk 202 . The second end of the mounting plate 210 is installed with a counterweight block 300 .

[0046] The opening direction of the guide through hole 211 is consistent with the direction of the sliding groove 209 , and both are distributed along the radial direction of the mounting plate 202 , ensuring that when the adjusting column 208 is radially adjusted, the mounting plate 210 can be synchronously driven to slide back and forth along the sliding groove 209 .

[0047] Among them, the length direction of the mounting plate 210 is perpendicular to the end of the mounting disk 202, and the structure composed of the mounting plate 210, the guide through hole 211, and the counterweight block 300 is symmetrically distributed in two groups about the center of the mounting disk 202, so that the counterweights located on both sides of the mounting disk 202 are balanced.

[0048] The above-mentioned adjustment structure realizes the crankshaft counterweight in the following manner: when the operator needs to adjust the counterweight of the crankshaft, first use a wrench to screw the first nut 207 in the second through hole 204 to loosen the first nut 207. At this time, the first screw 205 can rotate freely. The operator uses an Allen wrench to drive the first screw 205 to rotate in the first through hole 203. The rotation of the first screw 205 can adjust the distance between the adjustment column 208, the mounting plate 210 and the counterweight block 300 relative to the axis of the mounting disk 202. Since several groups of adjustment structures are evenly distributed along the circumference of the mounting disk 202, the center of mass of the entire crankshaft can be moved to the axis of the main shaft 104 through the rotation adjustment of several first screws 205. At this time, the first nut 207 is rotated to lock it, the free rotation of the first screw 205 is limited, and the position of the adjustment column 208 is fixed, and the counterweight adjustment of the crankshaft is completed.

[0049] Of course, the counterweight block 300 can be a counterweight fixed on the second end of the mounting plate 210 by various installation methods such as welding, bolting, bonding, etc. Its shape, material, and quality are finally determined after calculation by professional and technical personnel in this field to meet the crankshaft counterweight requirements. The calculation and installation process is a commonly used technical means in this field and will not be repeated here.

[0050] One end of the sliding groove 209 away from the axis of the mounting disk 202 is connected to the outside of the mounting disk 202 through an oil hole 212 , and the oil hole 212 is radially opened on the side of the mounting disk 202 .

[0051] Among them, the cross-sectional shape of the outer surface of the adjustment column 208 is a regular polygon, and the cross-sectional shape of the inner surface of the sliding groove 209 is a regular polygon that matches the cross-sectional shape of the outer surface of the adjustment column 208, so as to facilitate the guiding effect of the sliding groove 209 on the adjustment column 208.

[0052] The present invention also provides a vibration reduction counterweight structure, see Figures 6-7 The second end of the mounting plate 210 is fixedly connected to the middle of the counterweight plate 301. The two ends of the counterweight plate 301 are respectively fixed with guide sliders 302 on one side close to the end surface of the mounting disk 202. The guide sliders 302 are sealed in the guide grooves 303 and move along them. The guide grooves 303 are opened on the end surface of the mounting disk 202.

[0053] The counterweight plate 301 is provided with an adjustment groove 304 along the length direction, and a counterweight slider 305 sliding along the adjustment groove is arranged in the adjustment groove 304, and a plurality of counterweight bars 310 are installed on the counterweight slider 305. The counterweight slider 305 is threadedly connected to the middle part of the second screw rod 306, and the first end of the second screw rod 306 is rotatably installed on the first end of the counterweight plate 301. The second end of the counterweight plate 301 is provided with a fixing groove capable of sleeved with a fixing plate 307, and the second end of the second screw rod 306 passes through a through hole provided on the fixing plate 307 and is sequentially installed with a second washer 308 and a second nut 309, the second washer 308 is sleeved on the outside of the second screw rod 306, and the second nut 309 is threadedly connected to the second screw rod 306.

[0054] The above structure of the present invention enables the operator to adjust the counterweight position in a direction perpendicular to the adjustment column 208. First, the second nut 309 is loosened to allow the second screw 306 to rotate freely. Then, the second screw 306 is rotated according to usage requirements, thereby driving the counterweight slider 305 to slide back and forth along the adjustment slot 304. After the counterweight slider 305 is adjusted to the target position, the second nut 309 is tightened to lock the position of the counterweight slider 305.

[0055] In addition, by completely disassembling the second nut 309, the second washer 308, and the fixing plate 307, the counterweight slider 305 can be replaced, which is convenient for adapting to various counterweight methods, thereby quickly meeting the counterweight requirements and facilitating counterweight adjustment.

[0056] As another possible embodiment of the present invention, see Figures 8-9 The counterweight bar 310 can be installed on the counterweight slider 305 by threaded fastening. A number of threaded holes 311 are evenly arranged on the counterweight slider 305. A first positioning groove 312 is coaxially arranged on the upper surface of the counterweight slider 305 with the threaded hole 311. A positioning tube 313 is fixed to the bottom of the counterweight bar 310. The positioning tube 313 can be arranged in the first positioning groove 312 and coaxially connected with the threaded hole 311. A second positioning groove 314 is coaxially arranged on the top of the counterweight bar 310 with the positioning tube 313. The second positioning groove 314 can be sleeved with a positioning tube 313 of another counterweight bar 310.

[0057] The structure composed of the threaded hole 311 and the first positioning groove 312 is symmetrically distributed in two groups about the center of the counterweight slider 305, and the structure composed of the positioning tube 313 and the second positioning groove 314 is symmetrically distributed in two groups about the center of the counterweight bar 310, thereby facilitating the fixed installation of the counterweight bar 310 on the counterweight slider 305.

[0058] Through the above structure, the operator can adjust the installation position of the counterweight bar 310 on the counterweight slider 305 according to actual use requirements, and can also adjust the installation quantity of the counterweight bar 310, such as Fig. 9As shown, two counterweight bars 310 are installed in a stacked manner. By setting up this structure, the increase or decrease of the counterweight is made more flexible, which provides convenience for operators to adjust the counterweight and greatly improves the operating efficiency of the counterweight.

[0059] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vibration-damped crankshaft, comprising a mounting shaft (101), characterized in that: The installation shaft (101) is located at the end of the crankshaft, and a first cam (102), a first connecting rod shaft (103), a second cam (102), a main shaft (104), a third cam (102), a second connecting rod shaft (103), a fourth cam (102), a counterweight shaft (105) and a counterweight plate (200) are fixed in sequence from the installation shaft (101) to the middle of the crankshaft; The connecting rod shaft (103) is used for installing the connecting rod, the main shaft (104) is used for installing the crankshaft, the installation shaft (101), the main shaft (104), and the counterweight shaft (105) are coaxially arranged, the plane where the axis of the connecting rod shaft (103) and the axis of the main shaft (104) are located together is a symmetry plane of the plurality of cams (102), and the two sides of the crankshaft are symmetrically distributed about the center of the counterweight plate (200); The counterweight plate (200) comprises a cover plate (201) and a mounting plate (202); the mounting plate (202) is coaxially fixed to the counterweight shaft (105); and the cover plates (201) are respectively mounted on both sides of the mounting plate (202); The mounting plate (202) is composed of a plurality of adjustment structures, wherein the adjustment structure comprises a first screw rod (205), the first screw rod (205) is radially rotatably mounted on the mounting plate (202), the first screw rod (205) is threadedly connected to an adjustment column (208), the adjustment column (208) is arranged in a sliding groove (209) and moves along the sliding groove (209), and the sliding groove (209) is radially opened in the mounting plate (202); The side surface of the adjustment column (208) is fixed to the mounting plate (210), the mounting plate (210) is arranged in the guide through hole (211) and moves along the guide through hole (211), the guide through hole (211) is opened on the mounting plate (202), and the mounting plate (210) is installed with a counterweight (300); The mounting plate (202) is provided with a first through hole (203) and a second through hole (204); the first end of the first screw rod (205) is rotatably mounted in a through groove between the first through hole (203) and the second through hole (204); a first washer (206) and a first nut (207) are sequentially mounted on the middle portion of the first screw rod (205) along the radial direction of the mounting plate (202) from inside to outside; the first washer (206) is sleeved on the outside of the first screw rod (205); the first nut (207) is threadedly connected to the first screw rod (205); and the first washer (206) and the first nut (207) are arranged in the second through hole (204).

2. The vibration-damped crankshaft according to claim 1, characterized in that: The structure consisting of the mounting plate (210), the guide through hole (211), and the counterweight block (300) is symmetrically distributed in two groups about the center of the mounting plate (202).

3. The vibration-damped crankshaft according to claim 1, characterized in that: The bisectors of the first through hole (203) and the second through hole (204) coincide with each other, and the bisectors of the two coincide with the radial line of the mounting plate (202).

4. The vibration-damped crankshaft according to claim 1, characterized in that: One end of the sliding groove (209) away from the axis of the mounting plate (202) is connected to the outside of the mounting plate (202) through an oil hole (212), and the oil hole (212) is radially opened on the side of the mounting plate (202).

5. A vibration-damping counterweight structure, comprising a counterweight plate (301), characterized in that: The counterweight plate (301) is fixed to the mounting plate (210), and guide sliders (302) are respectively fixed to both ends of the counterweight plate (301). The guide sliders (302) are sealed and arranged in guide grooves (303) and move along the guide grooves (303). The guide grooves (303) are formed on the end surface of the mounting plate (202); The counterweight plate (301) is provided with an adjustment slot (304), a counterweight slider (305) sliding along the adjustment slot (304) is arranged in the adjustment slot, and a plurality of counterweight bars (310) are mounted on the counterweight slider (305); The counterweight slider (305) is threadedly connected to the second screw rod (306); the first end of the second screw rod (306) is rotatably mounted on the first end of the counterweight plate (301); the second end of the counterweight plate (301) is provided with a fixing groove capable of sleeved with a fixing plate (307); the second end of the second screw rod (306) passes through a through hole provided on the fixing plate (307) and is sequentially installed with a second washer (308) and a second nut (309); the second washer (308) is sleeved on the outside of the second screw rod (306); and the second nut (309) is threadedly connected to the second screw rod (306).

6. The vibration-damping counterweight structure according to claim 5, characterized in that: The counterweight slider (305) is evenly provided with a plurality of threaded holes (311); a first positioning groove (312) is coaxially provided on the upper surface of the counterweight slider (305) and the threaded hole (311); a positioning tube (313) is fixed to the bottom of the counterweight bar (310); the positioning tube (313) can be arranged in the first positioning groove (312) and is coaxially connected to the threaded hole (311); a second positioning groove (314) is coaxially provided on the top of the counterweight bar (310) and the positioning tube (313); the positioning tube (313) of another counterweight bar (310) can be sleeved in the second positioning groove (314).

7. The vibration-damping counterweight structure according to claim 6, characterized in that: The structure composed of the threaded holes (311) and the first positioning grooves (312) is symmetrically distributed in two groups about the center of the counterweight sliding block (305).

8. The vibration-damping counterweight structure according to claim 6, characterized in that: The structure composed of the positioning tubes (313) and the second positioning grooves (314) is symmetrically distributed in two groups about the center of the counterweight bar (310).

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