A synchronous belt structure capable of generating a second order balancing force

Abstract

The application is suitable for the technical field of cutting bed equipment, and particularly relates to a synchronous belt structure capable of generating second-order balancing force, comprising a rack, a driving wheel and a first-order balancing wheel set, two groups of main balancing wheels being in driving connection with the driving wheel through a first driving belt, and the main balancing wheels being connected with two groups of eccentric wheels; the second-order balancing wheel set comprises two groups of auxiliary balancing wheels, which are installed on the rack, connected with the main balancing wheels, and smaller in diameter than the main balancing wheels, and connected with eccentric wheels. The second-order balancing wheel set is additionally arranged on the basis of the existing synchronous belt driving structure, and the auxiliary balancing wheels are higher in rotating speed than the main balancing wheels due to the structural feature that the auxiliary balancing wheels are smaller in diameter than the main balancing wheels, so that the balancing force opposite to the direction of the second-order inertial force is generated, the influence of the second-order inertial force on the system is effectively eliminated, and the stability of the equipment operation and the machining precision are significantly improved.

Description

Technical Field

[0001] This invention belongs to the technical field of cutting bed equipment, and particularly relates to a synchronous belt structure that can generate second-order balanced force. Background Technology

[0002] In the cutting industry, the reciprocating cutting motion of the cutting tool is usually driven by a crank-connecting rod mechanism. In the existing technology, the reciprocating drive and balancing structure of the cutting tool mainly adopts a synchronous belt drive, that is, a driving wheel drives two balancing wheels to rotate synchronously through a synchronous belt. The driving wheel and the two balancing wheels rotate at the same speed but in opposite directions. The two balancing wheels are symmetrically arranged on both sides of the driving wheel to balance the first-order inertial force generated by the reciprocating motion.

[0003] However, the existing balancing structures described above can only balance the first-order inertial force in reciprocating motion and cannot effectively eliminate the second-order inertial force. As cutting equipment develops towards higher speeds, the impact of the second-order inertial force on system stability becomes increasingly significant. Existing structures that only balance the first-order force still exhibit considerable residual vibration, leading to decreased cutting accuracy, increased equipment noise, and shortened service life. Therefore, it is urgent to further balance the reciprocating second-order inertial force based on the existing synchronous belt drive structure. Summary of the Invention

[0004] The purpose of this invention is to provide a synchronous belt structure that can generate a second-order balancing force, in order to solve the problem that existing structures that only balance the first-order force still have large residual vibrations, resulting in decreased cutting accuracy of the tool, increased equipment noise, and shortened service life.

[0005] This invention is implemented as follows: a synchronous belt structure capable of generating a second-order balanced force includes a frame, and the synchronous belt structure further includes:

[0006] The drive wheel is rotatably mounted on the frame and is used to receive external driving power;

[0007] The first-order balancing wheel set includes two sets of main balancing wheels, which are mounted on the frame. The two sets of main balancing wheels are connected to the driving wheel via a first transmission belt. Two sets of eccentric wheels are fixedly connected to the shafts of the two sets of main balancing wheels.

[0008] The second-order balancing wheel set includes two sets of auxiliary balancing wheels, which are mounted on the frame. The two sets of auxiliary balancing wheels are respectively connected to the two sets of main balancing wheels. The diameter of the auxiliary balancing wheels is smaller than that of the main balancing wheels. Two sets of eccentric wheels are fixedly connected to the shafts of the two sets of auxiliary balancing wheels.

[0009] Preferably, the two sets of main balance wheels are a first balance wheel and a second balance wheel. Both the first balance wheel and the second balance wheel are rotatably mounted on the frame via a rotating shaft. A first tension wheel is also rotatably mounted on the frame. The first balance wheel, the second balance wheel, the drive wheel, and the first tension wheel are connected by a first transmission belt. The second balance wheel is located outside the first transmission belt. A first eccentric wheel and a second eccentric wheel are fixedly connected to the rotating shafts of the first balance wheel and the second balance wheel, respectively.

[0010] Preferably, when the load connected to the drive wheel is at the bottom dead center, the centers of gravity of both the first eccentric wheel and the second eccentric wheel are at the top dead center.

[0011] Preferably, the first balance wheel, the second balance wheel, and the drive wheel have the same diameter.

[0012] Preferably, the two sets of auxiliary balance wheels are a third balance wheel and a fourth balance wheel. A third eccentric wheel and a fourth eccentric wheel are fixedly connected to the shafts of the third balance wheel and the fourth balance wheel, respectively. The third balance wheel is connected to the first balance wheel through a second transmission belt, and the fourth eccentric wheel and the second balance wheel are connected through a third transmission belt. A second tensioning wheel and a third tensioning wheel are also rotatably mounted on the frame. The second tensioning wheel meshes with the second transmission belt from the outside to tension the second transmission belt, and the third tensioning wheel meshes with the third transmission belt from the outside to tension the third transmission belt.

[0013] Preferably, the diameters of the third and fourth balance wheels are half the diameters of the first and second balance wheels, respectively.

[0014] Preferably, a third eccentric wheel and a fourth eccentric wheel are fixedly connected to the shafts of the first and second balance wheels, respectively;

[0015] Furthermore, when the load connected to the drive wheel is at the top dead center, the centers of gravity of both the third and fourth eccentric wheels are at the top dead center position.

[0016] Preferably, the drive wheel's shaft is fixedly connected to a crank wheel, and the crank wheel is connected to a slider via a connecting rod. The slider is used for linear sliding relative to the frame, and a cutting tool is mounted on the slider.

[0017] Preferably, the two sets of main balance wheels are symmetrically arranged, and the two sets of auxiliary balance wheels are symmetrically arranged, with the axis of symmetry passing through the center of the driving wheel.

[0018] Preferably, the first transmission belt is a synchronous belt.

[0019] This invention adds a second-order balancing wheel set to the existing synchronous belt drive structure. By utilizing the structural characteristic that the diameter of the secondary balancing wheel is smaller than that of the primary balancing wheel, the secondary balancing wheel can achieve a higher rotational speed than the primary balancing wheel. This generates a balancing force opposite to the direction of the reciprocating second-order inertial force, effectively eliminating the influence of the second-order inertial force on the system and significantly improving the stability of equipment operation and machining accuracy. Attached Figure Description

[0020] Figure 1 A first-view structural schematic diagram of a synchronous belt structure capable of generating second-order equilibrium force, provided in an embodiment of the present invention;

[0021] Figure 2 This is a second-view structural schematic diagram of a synchronous belt structure capable of generating second-order equilibrium force, provided as an embodiment of the present invention.

[0022] Figure 3 A third-view structural schematic diagram of a synchronous belt structure capable of generating second-order equilibrium force, provided as an embodiment of the present invention;

[0023] Figure 4 A fourth-view structural diagram of a synchronous belt structure capable of generating second-order balancing forces provided for an embodiment of the present invention (hiding part of the frame).

[0024] Figure 5 A schematic diagram of the first simulation results provided for an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the second simulation results provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the third simulation result provided in an embodiment of the present invention.

[0027] In the attached diagram: 1. Frame; 2. Cutting tool; 3. First balance wheel; 4. Second balance wheel; 5. Drive wheel; 6. First tension wheel; 7. Third balance wheel; 8. Second tension wheel; 9. Third tension wheel; 10. Fourth balance wheel; 11. First drive belt; 12. Second drive belt; 13. Third drive belt; 14. Crank wheel; 15. Fourth eccentric wheel; 16. Third eccentric wheel; 17. Second eccentric wheel; 18. First eccentric wheel; 19. Connecting rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] This invention addresses the technical shortcomings of existing synchronous belt drive structures, which can only balance reciprocating first-order inertial forces and cannot eliminate second-order inertial forces. It provides a synchronous belt structure that can generate second-order balancing forces, aiming to achieve the balance of second-order inertial forces through pure mechanical transmission and improve the stability of system operation.

[0031] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a synchronous belt structure capable of generating second-order balancing force is provided in an embodiment of the present invention, including a frame 1, on which a drive wheel 5, a first balancing wheel 3, a second balancing wheel 4, a third balancing wheel 7 and a fourth balancing wheel 10 are rotatably mounted.

[0032] The drive wheel 5 is used to receive external driving power (such as the rotational power output by the motor) and transmit the power to each balance wheel.

[0033] Drive connection between the drive wheel and the cutting tool:

[0034] like Figure 2 As shown, the shaft of the drive wheel 5 is fixedly connected to the crank wheel 14, and the crank wheel 14 is connected to a slider (not shown in the figure) through the connecting rod 19. The slider is slidably mounted on the frame 1 for linear sliding relative to the frame 1, and the cutter 2 is mounted on the slider.

[0035] When the drive wheel 5 rotates, it drives the crank wheel 14 to rotate synchronously. The crank wheel 14 converts the rotational motion into the reciprocating linear motion of the slider through the connecting rod 19, thereby driving the cutter 2 to cut up and down reciprocally. Since the crank wheel 14 is an eccentric structure, it will generate reciprocating inertial force during rotation. This inertial force can be decomposed into first-order inertial force and second-order inertial force.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a first-order balancing wheel assembly:

[0037] The first-order balancing wheel set includes two sets of main balancing wheels, namely the first balancing wheel 3 and the second balancing wheel 4. The first balancing wheel 3 and the second balancing wheel 4 are respectively mounted on the frame 1 via rotating shafts.

[0038] A first tensioning pulley 6 is rotatably mounted on the frame 1. The first balance pulley 3, the second balance pulley 4, the drive pulley 5, and the first tensioning pulley 6 are connected by a first transmission belt 11. Specifically, the first transmission belt 11 sequentially passes around the drive pulley 5, the first balance pulley 3, the first tensioning pulley 6, and the second balance pulley 4 to form a closed transmission circuit. The second balance pulley 4 is located outside the first transmission belt 11 (i.e., the first transmission belt 11 passes around the outside of the second balance pulley 4) to achieve the opposite rotation of the second balance pulley 4 and the first balance pulley 3.

[0039] The first tensioner 6 is used to tension the first transmission belt 11, ensuring reliable transmission between the drive pulley 5 and the first balance pulley 3 and the second balance pulley 4, and preventing tooth skipping.

[0040] The second tensioner 8 is used to tension the second transmission belt 12, and the third tensioner 9 is used to tension the third transmission belt 13, ensuring reliable transmission between the first balance wheel 3 and the third balance wheel 7, and between the second balance wheel 4 and the fourth balance wheel 10.

[0041] The first transmission belt 11, the second transmission belt 12, and the third transmission belt 13 are all synchronous belts (toothed belts). The driving pulley 5, the first balance pulley 3, the second balance pulley 4, the third balance pulley 7, the fourth balance pulley 10, the first tension pulley 6, the second tension pulley 8, and the third tension pulley 9 are all toothed synchronous pulleys to ensure the accuracy and synchronicity of the transmission.

[0042] The first eccentric wheel 18, the second eccentric wheel 17, the third eccentric wheel 16 and the fourth eccentric wheel 15 are manufactured in an integral manner with their respective balance wheels, or are installed on the shaft of the balance wheel in a separate structure (such as by key connection or bolt fixation).

[0043] The first balance wheel 3 and the second balance wheel 4 have the same diameter as the driving wheel 5. Therefore, the rotation speed of the first balance wheel 3 and the second balance wheel 4 is the same as that of the driving wheel 5. Due to the winding method of the first transmission belt 11, the first balance wheel 3 and the second balance wheel 4 rotate in opposite directions (i.e., they rotate in opposite directions).

[0044] A first eccentric wheel 18 is fixedly connected to the shaft of the first balance wheel 3, and a second eccentric wheel 17 is fixedly connected to the shaft of the second balance wheel 4. Both the first eccentric wheel 18 and the second eccentric wheel 17 are eccentric wheel structures, that is, their centers of gravity are off-center from the center of rotation. When the first balance wheel 3 and the second balance wheel 4 rotate, the first eccentric wheel 18 and the second eccentric wheel 17 rotate accordingly, generating centrifugal force.

[0045] The installation phases of the first eccentric wheel 18 and the second eccentric wheel 17 are as follows: when the load (i.e., the tool 2) connected to the driving wheel 5 is at the bottom dead center, the centers of gravity of both the first eccentric wheel 18 and the second eccentric wheel 17 are at the top dead center. In other words, the eccentric directions of the first eccentric wheel 18 and the second eccentric wheel 17 are opposite to the eccentric direction of the driving wheel 5, thereby generating a balancing force opposite to the direction of the first-order inertial force, achieving the balance of the first-order inertial force.

[0046] Second-order balance wheel set:

[0047] The second-order balancing wheel set includes two sets of auxiliary balancing wheels, namely the third balancing wheel 7 and the fourth balancing wheel 10. The third balancing wheel 7 and the fourth balancing wheel 10 are rotatably mounted on the frame 1 via rotating shafts.

[0048] The third balance wheel 7 is connected to the first balance wheel 3 via a second transmission belt 12. Specifically, the second transmission belt 12 passes around the first balance wheel 3 and the third balance wheel 7. The fourth balance wheel 10 is connected to the second balance wheel 4 via a third transmission belt 13. Specifically, the third transmission belt 13 passes around the second balance wheel 4 and the fourth balance wheel 10.

[0049] A second tensioner 8 and a third tensioner 9 are also rotatably mounted on the frame 1. The second tensioner 8 engages with the second transmission belt 12 from the outer periphery to tension the second transmission belt 12; the third tensioner 9 engages with the third transmission belt 13 from the outer periphery to tension the third transmission belt 13.

[0050] The diameters of the third balance wheel 7 and the fourth balance wheel 10 are half the diameters of the first balance wheel 3 and the second balance wheel 4, respectively. Due to this diameter ratio, the rotational speed of the third balance wheel 7 is twice that of the first balance wheel 3, and the rotational speed of the fourth balance wheel 10 is twice that of the second balance wheel 4. Since the rotational speeds of the first balance wheel 3 and the second balance wheel 4 are the same as those of the driving wheel 5, the rotational speeds of the third balance wheel 7 and the fourth balance wheel 10 are twice that of the driving wheel 5.

[0051] Meanwhile, due to the transmission methods of the second transmission belt 12 and the third transmission belt 13, the third balance wheel 7 rotates in the same direction as the first balance wheel 3, and the fourth balance wheel 10 rotates in the same direction as the second balance wheel 4. However, the first balance wheel 3 rotates in the opposite direction to the second balance wheel 4, therefore the third balance wheel 7 and the fourth balance wheel 10 also rotate in opposite directions (i.e., they rotate in opposite directions).

[0052] The third eccentric wheel 16 is fixedly connected to the shaft of the third balance wheel 7, and the fourth eccentric wheel 15 is fixedly connected to the shaft of the fourth balance wheel 10. Both the third eccentric wheel 16 and the fourth eccentric wheel 15 are eccentric wheel structures. When the third balance wheel 7 and the fourth balance wheel 10 rotate at twice the speed, the third eccentric wheel 16 and the fourth eccentric wheel 15 rotate accordingly, generating centrifugal force.

[0053] The installation phases of the third eccentric wheel 16 and the fourth eccentric wheel 15 are as follows: when the load (i.e., the tool 2) connected to the driving wheel 5 is at the top dead center, the centers of gravity of both the third eccentric wheel 16 and the fourth eccentric wheel 15 are at the top dead center position. Since the rotational speed of the third eccentric wheel 16 and the fourth eccentric wheel 15 is twice that of the driving wheel 5, the centrifugal force they generate is opposite to the direction of the second-order inertial force, thus achieving a balance of the second-order inertial force.

[0054] The working principle of this invention is as follows:

[0055] The drive wheel 5 receives external power to rotate, which drives the tool 2 to move up and down reciprocally through the crank wheel 14 and connecting rod 19; on the other hand, it drives the first balance wheel 3 and the second balance wheel 4 to rotate synchronously through the first transmission belt 11.

[0056] The first balance wheel 3 and the second balance wheel 4 rotate in opposite directions at the same speed as the driving wheel 5. The first eccentric wheel 18 and the second eccentric wheel 17 fixed on their shafts generate centrifugal force. Since the phase of the center of gravity of the first eccentric wheel 18 and the second eccentric wheel 17 is opposite to the phase of the eccentricity of the driving wheel 5 (when the load is at the bottom dead center, the center of gravity of the first-order eccentric wheel is at the top dead center), the direction of the resultant centrifugal force is opposite to the direction of the first-order inertial force, thus achieving the balance of the first-order inertial force.

[0057] Simultaneously, the first balance wheel 3 drives the third balance wheel 7 via the second transmission belt 12, and the second balance wheel 4 drives the fourth balance wheel 10 via the third transmission belt 13. Since the diameters of the third balance wheel 7 and the fourth balance wheel 10 are half that of the first balance wheel 3 and the second balance wheel 4, respectively, the rotational speeds of the third balance wheel 7 and the fourth balance wheel 10 are twice that of the driving wheel 5. The third balance wheel 7 and the fourth balance wheel 10 rotate in opposite directions, generating centrifugal force on their fixed shafts, specifically on the third eccentric wheel 16 and the fourth eccentric wheel 15. Because the rotational speeds of the third eccentric wheel 16 and the fourth eccentric wheel 15 are twice that of the driving wheel 5, and their centers of gravity are properly phased (at the top dead center of the load, the center of gravity of the second-order eccentric wheel is at the top dead center), the resultant centrifugal force is opposite in direction to the second-order inertial force, thus achieving balance of the second-order inertial force.

[0058] This invention is particularly applicable to the reciprocating drive system of cutting machines. By improving the existing synchronous belt drive structure and adding a second-order balancing pulley set, the influence of second-order inertial forces on the system is effectively eliminated, significantly improving the smoothness of equipment operation and machining accuracy. Furthermore, this invention is also applicable to other mechanical equipment requiring reciprocating motion and high stability, such as stamping equipment and compressors.

[0059] The theoretical principles of this invention are described below:

[0060] The object reciprocates through a linkage, and the reciprocating force generated by the mechanism is:

[0061] F=M*r*ω 2 *(COSα+λ*COS(2*α))

[0062] Where F is the reciprocating force generated, M is the reciprocating mass (a fixed value), r is the rotation radius of the crank (a fixed value), ω is the angular velocity of the crank (a fixed value), α is the angle of the crank, and λ is the connecting rod ratio (a fixed value).

[0063] The formula can be modified, resulting in the following reciprocating force:

[0064] And let M*r*ω 2 =K;

[0065] F = K*COSα + K*λ*COS(2*α)

[0066] The reciprocating force can then be decomposed as F = f(α) + f(2*α);

[0067] Where f(α) is the first-order reciprocating force and f(2*α) is the second-order reciprocating force.

[0068] Currently, the cutting tool reciprocating balance structure in the cutting machine industry only balances the first-order reciprocating force. Based on this, a structure for balancing the second-order reciprocating force is proposed.

[0069] This invention primarily balances the second-order reciprocating force based on the first-order reciprocating force. The load reciprocates under the action of the eccentric wheel. The reciprocating force of the system is generated by the eccentric wheel. Simulation results show that without balancing, the system forces are (-641N, 468N). Figure 5 As shown.

[0070] In the mechanism, two first-order balancing wheels (first balancing wheel 3 and second balancing wheel 4) rotate in opposite directions. These wheels are eccentric, and their initial phase is determined by the center of gravity of the eccentric wheel. When the eccentric wheel is loaded on top, the center of gravity of the first-order balancing wheel is on the bottom, and the rotational speed of the first-order balancing wheel is the same as that of the eccentric wheel, expressed as f(α) in the formula. Therefore, the two first-order balancing wheels jointly generate a resultant force from both above and below, but the resultant forces from both sides cancel each other out, thus balancing the reciprocating first-order force of the eccentric wheel. Simulation results show that after first-order force balancing, the system force is (-86N, 86N). Figure 6 As shown.

[0071] In the mechanism, two second-order balancing wheels (i.e., the third balancing wheel 7 and the fourth balancing wheel 10) rotate in opposite directions. These wheels are also eccentric wheel structures. The initial phase is determined by the position of the center of gravity of the eccentric wheel. When the eccentric wheel is under load, the center of gravity of the second-order balancing wheel is also on top, and the rotational speed of the second-order balancing wheel is twice that of the eccentric wheel, expressed as f(2*α). Therefore, the two second-order balancing wheels together generate a resultant force in both directions, but the resultant forces in the left and right directions cancel each other out, thus balancing the reciprocating second-order force of the eccentric wheel. Simulation results show that after balancing the second-order forces, the system force is (-0.9N, 0.8N). Figure 7 As shown.

[0072] After satisfying the above theoretical design, consider the synchronous belt drive, where the eccentric pulley and the first-order balance pulley are the same size, and the second-order balance pulley is half the size of the first-order balance pulley. That is, the synchronous belt pulley tooth ratio is eccentric pulley: first-order balance pulley: second-order balance pulley = 2:2:1.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A synchronous belt structure capable of generating a second-order balanced force, comprising a frame (1), characterized in that, The synchronous belt structure also includes: The drive wheel (5) is rotatably mounted on the frame (1) and is used to receive external driving power; The first-order balancing wheel set includes two sets of main balancing wheels, which are mounted on the frame (1). The two sets of main balancing wheels are connected to the drive wheel (5) via the first transmission belt (11). Two sets of eccentric wheels are fixedly connected to the shafts of the two sets of main balancing wheels. The second-order balancing wheel set includes two sets of auxiliary balancing wheels, which are installed on the frame (1). The two sets of auxiliary balancing wheels are respectively connected to the two sets of main balancing wheels. The diameter of the auxiliary balancing wheels is smaller than that of the main balancing wheels. Two sets of eccentric wheels are fixedly connected to the shafts of the two sets of auxiliary balancing wheels.

2. The synchronous belt structure capable of generating a second-order balanced force according to claim 1, characterized in that, The two sets of main balance wheels are the first balance wheel (3) and the second balance wheel (4). The first balance wheel (3) and the second balance wheel (4) are both rotatably mounted on the frame (1) via a rotating shaft. The first tension wheel (6) is also rotatably mounted on the frame (1). The first balance wheel (3), the second balance wheel (4), the drive wheel (5) and the first tension wheel (6) are connected by a first transmission belt (11). The second balance wheel (4) is located outside the first transmission belt (11). The first eccentric wheel (18) and the second eccentric wheel (17) are fixedly connected to the rotating shafts of the first balance wheel (3) and the second balance wheel (4), respectively.

3. The synchronous belt structure capable of generating a second-order balanced force according to claim 2, characterized in that, When the load connected to the drive wheel (5) is at the bottom dead center, the center of gravity of the first eccentric wheel (18) and the second eccentric wheel (17) are both at the top dead center.

4. The synchronous belt structure capable of generating a second-order balanced force according to claim 2, characterized in that, The first balance wheel (3), the second balance wheel (4), and the driving wheel (5) have the same diameter.

5. The synchronous belt structure capable of generating a second-order balanced force according to claim 1, characterized in that, The two sets of auxiliary balance wheels are the third balance wheel (7) and the fourth balance wheel (10). The third eccentric wheel (16) and the fourth eccentric wheel (15) are fixedly connected to the shafts of the third balance wheel (7) and the fourth balance wheel (10). The third balance wheel (7) is connected to the first balance wheel (3) through the second transmission belt (12). The fourth eccentric wheel (15) is connected to the second balance wheel (4) through the third transmission belt (13). The second tension wheel (8) and the third tension wheel (9) are also rotatably installed on the frame (1). The second tension wheel (8) meshes with the second transmission belt (12) from the outside and is used to tension the second transmission belt (12). The third tension wheel (9) meshes with the third transmission belt (13) from the outside and is used to tension the third transmission belt (13).

6. The synchronous belt structure capable of generating a second-order balanced force according to claim 5, characterized in that, The diameters of the third balance wheel (7) and the fourth balance wheel (10) are half the diameters of the first balance wheel (3) and the second balance wheel (4), respectively.

7. The synchronous belt structure capable of generating a second-order balanced force according to claim 5, characterized in that, The third eccentric wheel (16) and the fourth eccentric wheel (15) are fixedly connected to the shafts of the first balance wheel (3) and the second balance wheel (4), respectively. Furthermore, when the load connected to the drive wheel (5) is at the top dead center, the centers of gravity of the third eccentric wheel (16) and the fourth eccentric wheel (15) are both at the top dead center position.

8. The synchronous belt structure capable of generating a second-order balanced force according to claim 1, characterized in that, The drive wheel (5) is fixedly connected to a crank wheel (14), and the crank wheel (14) is connected to a slider via a connecting rod (19). The slider is used to slide linearly relative to the frame (1), and a cutting tool (2) is mounted on the slider.

9. The synchronous belt structure capable of generating a second-order balanced force according to claim 1, characterized in that, Two sets of main balance wheels are symmetrically arranged, and two sets of auxiliary balance wheels are symmetrically arranged, with the axis of symmetry passing through the center of the driving wheel (5).

10. The synchronous belt structure capable of generating a second-order balanced force according to claim 1, characterized in that, The first transmission belt (11) is a synchronous belt.

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