Double-sided speed regulation pulley mechanism

Abstract

The present application relates to a kind of double-sided speed regulation pulley mechanism, first movable disc both sides are equipped with the first inner convex ring and the first outer convex ring of different outer diameter and the first inner inclined surface and the first outer inclined surface;Second movable disc both sides are equipped with the second inner convex ring and the second outer convex ring of different outer diameter and the second inner inclined surface and the second outer inclined surface;First, second disc body connecting portion is connected with flange plate, first inner inclined surface and second inner inclined surface form first pulley groove;First outer inclined surface and second outer inclined surface form second pulley groove;The included angle of the groove of first pulley groove and second pulley groove is same, the diameter difference of the groove bottom diameter D1 of first pulley groove and the groove bottom diameter D2 of second pulley groove is greater than 6mm, the center plane of first pulley groove and the center plane of second pulley groove are located in the same plane;Adjusting gasket is arranged on the both sides or any one side of flange plate.The present application can realize two-stage multi-gear transmission, and installation operation is convenient, can keep the center plane of pulley groove unchanged, under the premise that speed regulation range can be improved, pulley is good.

Description

Technical Field

[0001] This invention relates to a double-sided speed-regulating pulley mechanism, belonging to the technical field of single-groove V-belt speed change mechanism. Background Technology

[0002] A single-groove V-belt pulley speed change mechanism mounts a V-belt onto two pulleys with corresponding grooves. Power from the driving side is transmitted via the V-belt to the driven pulley, thus driving the main shaft on the driven side. However, the grooves on the pulleys are usually fixed. When the transmission mechanism requires speed changes, the fixed grooves cannot meet the speed change requirements, necessitating the use of electric motors and hydraulic motors for speed adjustment, resulting in high operating costs.

[0003] The transmission ratio can be changed by altering the size of the pulley groove, thus achieving the desired speed change. For example, an adjustable diameter combined pulley disclosed in CN208749956U achieves this by adjusting the size of the transmission belt groove. It includes a first half-pulley and a second half-pulley. The first half-pulley has an external thread, and the second half-pulley has an external thread that mates with the internal thread. The first and second half-pulleys are connected via the internal and external threads to form a triangular pulley. A locking mechanism is provided at the threaded connection between the first and second half-pulleys. The two half-pulleys are connected by threads, and by adjusting the distance between the two half-pulleys, the pulley groove diameter can be changed, achieving adjustable pitch circle. However, the V-belt gearbox structure requires two pulleys and a transmission belt mounted on them. The change in pulley groove width is achieved by the axial movement of one half of the pulley. During adjustment, the center plane of the pulley groove also changes axially. Therefore, the alignment cannot be guaranteed during pulley adjustment, which not only easily causes wear on the transmission belt, affecting its service life, but also reduces transmission efficiency. Furthermore, existing pulley gearboxes rely solely on adjusting the groove size for speed change, resulting in a limited speed range. Summary of the Invention

[0004] The purpose of this invention is to provide a double-sided speed-regulating pulley mechanism that can achieve two-stage multi-speed regulation, is easy to install and operate, keeps the center plane of the pulley groove unchanged, and improves the speed regulation range while ensuring good pulley alignment.

[0005] The technical solution of the present invention to achieve the above objectives is: a double-sided speed-regulating pulley mechanism, characterized in that: it includes an intermediate fixed seat, a first movable disc, a second movable disc, and an adjusting shim; The intermediate fixing seat is used to connect the first movable plate and the second movable plate. It includes a plate body with a central hole, and a raised flange is provided on the outer periphery of the intermediate fixing seat. The flange is provided with at least three axial intermediate mounting holes along the circumference. The first movable disc includes a first hole coaxial with the center line of the intermediate fixed seat and a first disc body connecting part corresponding to one side of the flange. The first disc body connecting part is provided with a first mounting hole corresponding to the intermediate mounting hole. The two sides of the first movable disc are respectively provided with a first inner convex ring and a first outer convex ring with different outer diameters. The outer side of the first inner convex ring to the outer periphery of the first movable disc has an inclined first inner slope, and the outer side of the first outer convex ring to the outer periphery of the first movable disc has an inclined first outer slope. The second movable disc includes a second hole coaxial with the center line of the intermediate fixed seat and a second disc body connecting part corresponding to the other side of the flange. The second disc body connecting part is provided with a second mounting hole corresponding to the intermediate mounting hole. The two sides of the second movable disc are respectively provided with a second inner convex ring and a second outer convex ring with different outer diameters. The outer side of the second inner convex ring to the outer periphery of the second movable disc has an inclined second inner slope, and the outer side of the second outer convex ring to the outer periphery of the second movable disc has an inclined second outer slope. The first hole of the first movable plate and the second hole of the second movable plate are located on both sides of the flange. The first plate body connecting part and the second plate body connecting part are connected to the flange with fasteners. When the first inner convex ring on the first movable plate is in contact with the second inner convex ring of the second movable plate, the first inner inclined surface and the second inner inclined surface form a V-shaped first pulley groove. When the first outer convex ring on the first movable plate is in contact with the second outer convex ring of the second movable plate, the first outer inclined surface and the second outer inclined surface form a V-shaped second pulley groove. The groove opening angle of the first pulley groove is the same as that of the second pulley groove, and the diameter difference between the groove bottom diameter D1 of the first pulley groove and the groove bottom diameter D2 of the second pulley groove is greater than 6mm. The center plane of the first pulley groove and the center plane of the second pulley groove are located on the same plane. Adjusting shims for adjusting the groove width of the first pulley groove and the groove width of the second pulley groove and the corresponding groove opening center plane are located on both sides or any one side of the flange.

[0006] This invention employs an intermediate fixed base and connected to it a first movable disc and a second movable disc. The first and second movable discs are equipped with corresponding inner and outer convex rings and corresponding inner and outer inclined surfaces. By mounting the first and second movable discs opposite to each other on the intermediate fixed base, two pulley grooves with different bottom diameters are formed. The working diameter of the pulleys can be changed by altering the installation position of the two movable discs, thereby changing the transmission ratio and achieving a two-stage speed regulation function. This significantly improves the speed regulation range without replacing the pulleys. Furthermore, by changing the installation position of the two movable discs, this invention ensures that the two pulley grooves formed by the first and second movable discs are located on the same central plane. Therefore, the pulleys used in pairs have good alignment, reducing transmission resistance and improving the service life and transmission efficiency of the transmission belt. This invention changes the groove width of the pulley by adjusting shims, thereby altering the transmission ratio by changing the working diameter of the pulley, thus achieving multi-speed adjustment. Furthermore, the installation position of the shims can be adjusted to fine-tune the center plane of the groove, changing the working diameter and adjusting the position of the pulley's center plane. This allows for multiple gear positions within a certain range, changing the transmission ratio of the transmission belt. This invention offers a wide speed range, good pulley alignment, low cost, and convenient operation, and is suitable for single-groove V-belt pulley speed change mechanisms. Attached Figure Description

[0007] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0008] Figure 1 This is a schematic diagram of one structure of the double-sided speed-regulating pulley mechanism of the present invention.

[0009] Figure 2 yes Figure 1 A side view structural diagram.

[0010] Figure 3 This is a schematic diagram of another structure of the double-sided speed-regulating pulley mechanism of the present invention.

[0011] Figure 4 This is the book Figure 3 A side view structural diagram.

[0012] Wherein: 1—First movable disc, 1-1—First inner inclined surface, 1-2—First outer inclined surface, 1-3—First outer convex ring, 1-4—First inner convex ring, 1-5—First disc body connecting part, 1-6—First mounting hole, 1-7—First notch, 2—Second movable disc, 2-1—Second inner inclined surface, 2-2—Second outer inclined surface, 2-3—Second stop, 2-4—Second outer convex ring, 2-5—First stop, 2-6—Second inner convex ring, 2-7—Second disc body connecting part, 2-8—Second mounting hole, 2-9—Second notch, 3—Intermediate fixed seat, 3-1—Center hole, 3-2—Flange, 3-3—Intermediate mounting hole, 4—Bolt, 5—Adjusting shim, 6—Nut, 7—Anti-loosening washer, 8—Shim. Detailed Implementation

[0013] See Figures 1-4 As shown, a double-sided speed-regulating pulley mechanism of the present invention includes an intermediate fixed seat 3, a first movable disc 1, a second movable disc 2, and an adjusting shim 5.

[0014] See Figures 1-4 As shown, the intermediate fixing seat 3 of the present invention is used to connect the first movable disc 1 and the second movable disc 2. It includes a disc body with a central hole 3-1, preferably in a disc shape. The central hole 3-1 has a keyway for connecting to a drive shaft via a key, thus enabling power transmission. A raised flange 3-2 is provided on the outer periphery of the intermediate fixing seat 3. The flange 3-2 has at least three axial intermediate mounting holes 3-1 along its circumference, evenly distributed, such as 3 to 6 intermediate mounting holes 3-1, corresponding to the first mounting holes 1-6 on the first movable disc 1 and the second mounting holes 2-8 on the second movable disc 2. Fasteners connect the first movable disc 1 and the second movable disc 2 to the intermediate fixing seat 3.

[0015] See Figures 1-4 As shown, the first movable disc 1 of the present invention includes a first hole coaxial with the center line of the intermediate fixed seat 3 and a first disc body connecting part 1-5 corresponding to one side of the flange 3-2. The first disc body connecting part 1-5 is provided with a first mounting hole 1-6 corresponding to the intermediate mounting hole 3-1, so that both sides of the first disc body connecting part 1-5 on the first movable disc 1 can be in contact with the flange 3-2 and the adjusting shims 5. By adjusting the number of adjusting shims 5, the groove width of the corresponding pulley groove is adjusted, and the working diameter of the pulley groove is changed, thereby realizing multi-level and multi-speed regulation. The first movable disc 1 of the present invention is provided with a first inner convex ring 1-4 and a first outer convex ring 1-3 with different outer diameters on both sides, see Figure 1 , 3As shown, the diameter of the first inner convex ring 1-4 is smaller than the diameter of the first outer convex ring 1-3. Alternatively, the diameter of the first inner convex ring 1-4 can be larger than the diameter of the first outer convex ring 1-3. The outer side of the first inner convex ring 1-4 to the outer periphery of the first movable disk 1 has an inclined first inner slope 1-1, and the outer side of the first outer convex ring 1-3 to the outer periphery of the first movable disk 1 has an inclined first outer slope 1-2. The inclination angles of the first inner slope 1-1 and the first outer slope 1-2 are the same.

[0016] See Figures 1-4 As shown, the second movable disk 2 of the present invention includes a second hole coaxial with the intermediate fixed seat 3 and a second disk body connecting part 2-7 corresponding to the other side of the flange 3-2. The second disk body connecting part 2-7 is provided with a second mounting hole 2-8 corresponding to the intermediate mounting hole 3-1, so that the first mounting hole 1-6, the intermediate mounting hole 3-1 and the second mounting hole 2-8 are arranged coaxially. The two sides of the second movable disk 2 are respectively provided with a second inner convex ring 2-6 and a second outer convex ring 2-4 with different outer diameters. Figure 1 , 3 As shown, the diameter of the second inner convex ring 2-6 is smaller than the diameter of the second outer convex ring 2-4; alternatively, the diameter of the second inner convex ring 2-6 can be larger than the diameter of the second outer convex ring 2-4. See Figure 1 , 3 As shown, the outer side of the second inner convex ring 2-6 of the present invention has an inclined second inner slope 2-1 extending to the outer periphery of the second movable disk 2, and the outer side of the second outer convex ring 2-4 has an inclined second outer slope 2-2 extending to the outer periphery of the second movable disk 2. The inclination angles of the second inner slope 2-1 and the second outer slope 2-2 are the same. After the inner and outer convex rings on the first movable disk 1 are matched with the inner and outer convex rings on the second movable disk 2, the installation positions of the first movable disk 1 and the second movable disk 2 are changed, which can form two pulley grooves with different bottom diameters, thereby changing the working diameter of the pulley groove and significantly increasing the speed range.

[0017] See Figure 1 , 3 As shown, the first hole of the first movable disc 1 and the second hole of the second movable disc 2 are located on both sides of the flange 3-2. The first disc body connecting part 1-5 and the second disc body connecting part 2-7 are connected to the flange 3-2 with fasteners. See Figure 1 As shown, when the first inner convex ring 1-4 on the first movable disk 1 is in contact with the second inner convex ring 2-6 on the second movable disk 2, the first inner inclined surface 1-1 and the second inner inclined surface 2-1 form a V-shaped first pulley groove A. See Figure 3As shown, when the first outer protruding ring 1-3 on the first movable disc 1 is in contact with the second outer protruding ring 2-4 on the second movable disc 2, the first outer inclined surface 1-2 and the second outer inclined surface 2-2 form a V-shaped second pulley groove B. The two sides of the pulley groove form a conical contact surface of a triangular belt. After the first movable disc 1 and the second movable disc 2 are flipped at the same time to change the installation position, two different working diameter pulley grooves can be formed.

[0018] See Figure 1 , 3 As shown, the included angle of the groove opening of the first pulley groove is the same as that of the groove opening of the second pulley groove, and the diameter difference between the bottom diameter D1 of the first pulley groove and the bottom diameter D2 of the second pulley groove is greater than 6 mm. See Figure 1 , 3 As shown, the bottom diameter D2 of the second pulley groove in this invention is larger than the bottom diameter D1 of the first pulley groove. Alternatively, the bottom diameter D2 of the second pulley groove can be smaller than the bottom diameter D1 of the first pulley groove. Because two different working diameters of pulley grooves can be formed, a significant change in the working diameter of the pulley groove can be achieved, greatly improving the speed regulation range compared to existing adjustment mechanisms. See... Figure 1 , 3 As shown, the center planes of the first pulley groove and the second pulley groove of the present invention are located on the same plane. In the case of two different working diameter pulley grooves, since the center planes of the first pulley groove and the second pulley groove are located on the same plane, it can be ensured that the center of the groove width of the two pulleys is located on the same plane during the subsequent speed adjustment process, and the pulley alignment is high. In this invention, the diameter difference between the bottom diameter D1 of the first pulley groove and the bottom diameter D2 of the second pulley groove is between 10 and 100 mm. For example, the difference between the bottom diameter D1 and the bottom diameter D2 of the first pulley groove is between 15 and 80 mm, or between 20 mm, 30 mm, and 40 mm, etc. The diameter difference between the two groove bottoms can be set according to the outer diameter of the pulley and the cross-sectional dimensions of the V-belt. Through the installation and combination of the first movable plate 1 and the second movable plate 2, first and second pulley grooves with different bottom diameters are formed. While increasing the speed adjustment range, the center plane of the adjusted pulley groove remains unchanged, thus exhibiting good alignment. See Figure 1 , 3 As shown, the intermediate fixed seat 3 of the present invention has a symmetrical structure. After the first movable plate 1 and the second movable plate 2 are installed in the intermediate fixed seat 3, the center plane of the flange 3-2 of the intermediate fixed seat 3 coincides with the center plane of the first pulley groove and the center plane of the second pulley groove.

[0019] See Figure 1 , 3As shown, the adjusting shims 5 of this invention, used to adjust the width of the first pulley groove and the width of the second pulley groove, as well as the corresponding center plane of the groove opening, are disposed on both sides or either side of the flange 3-2. The adjusting shims 5 of this invention can be used in pairs, not limited to a set, or used singly. The adjusting shims 5 are disposed on both sides of the flange 3-2 of the intermediate fixed seat 3 to achieve changes in the width of the pulley groove, thereby changing the working diameter of the pulley and thus changing the transmission ratio. By controlling the thickness and number of the adjusting shims 5, fixed-gear and multi-gear speed changes can be achieved. When the center plane of the pulley groove opening is offset, the installation position of the adjusting shims 5 can be adjusted to achieve fine-tuning of the center plane of the groove opening, ultimately changing the working diameter and adjusting the pulley center, while ensuring good pulley alignment.

[0020] See Figures 1-4 As shown, the fastener of this invention includes a bolt 4, a locking washer 7, and a nut 6. The bolt 4 passes through the first mounting hole 1-6 of the first disc connecting part 1-5, the corresponding hole on the adjusting shim 5, the intermediate mounting hole 3-1 of the flange 3-2, and the second mounting hole 2-8 of the second disc connecting part 2-7. The locking washer 7 and the nut 6 are mounted on the bolt 4, connecting the first movable disc 1, the adjusting shim 5, and the second movable disc 2 to the intermediate fixed seat 3. See Figures 1-4 As shown, the outer end face of the first disc connecting part 1-5 and the outer end face of the second disc connecting part 2-7 are also provided with a gasket. The gasket 8 can have the same structure and thickness as the adjusting gasket 5, and can be set between the flange 3-2 and the corresponding disc connecting part, and the gasket 8 can be used as the adjusting gasket 5.

[0021] See Figure 1 , 3 As shown, the second movable disc 2 of the present invention transitions to the second inner inclined surface 2-1 through a plane on the outer side of the second inner convex ring 2-6. The second inner convex ring 2-6 forms a first stop 2-5 with the plane. The first inner convex ring 1-4 is fitted onto the second inner convex ring 2-6, that is, the inner hole of the first inner convex ring 1-4 is fitted onto the outer circumference of the second inner convex ring 2-6. In the initial state, the end face of the first inner convex ring 1-4 is in contact with the first stop 2-5, and the end face of the second inner convex ring 2-6 is in contact with the first disc body connecting part 1-5. In the initial state of the present invention, the adjusting shim 5 may not be provided between the flange 3-2 and the connecting part of the two disc bodies, or it may be as follows. Figure 1 As shown, an adjusting shim 5 is provided at the connection between flange 3-2 and the two disc bodies. In this invention, the second movable disc 2 transitions to the second outer inclined surface 2-2 via a plane on the outer side of the second outer convex ring 2-4. The second outer convex ring 2-4 and the plane form a second stop 2-3. The first outer convex ring 1-3 is fitted onto the second outer convex ring 2-4. Initially, the end face of the first outer convex ring 1-3 is in contact with the second stop 2-3, and the end face of the second outer convex ring 2-4 is in contact with the first disc body connection 1-5. The adjusting shim 5 is not provided at the connection between flange 3-2 and the two disc bodies. Alternatively, it can be as follows... Figure 3 As shown, an adjusting shim 5 is provided at the connection between the flange 3-2 and the two disc bodies. This invention achieves two-stage transmission speed change by quickly connecting the first movable disc 1 and the second movable disc 2 to the intermediate fixed seat 3 through the mutual cooperation of the corresponding stop and the convex ring end face, forming pulley grooves with different working diameters.

[0022] The invention can also be configured such that the first movable disc 1 transitions to the first inner inclined surface 1-1 via a plane on the outer side of the first inner convex ring 1-4, the first inner convex ring 1-4 forms a first stop with the plane, and the second inner convex ring 2-6 is fitted onto the first inner convex ring 1-4. In the initial state, the end face of the second inner convex ring 2-6 is in contact with the first stop, and the end face of the first inner convex ring 1-4 is in contact with the second disc body connecting part 2-7, forming a first pulley groove. Alternatively, the first movable disc 1 transitions to the first outer inclined surface 1-2 via a plane on the outer side of the first outer convex ring 1-3, the first outer convex ring 1-3 forms a second stop with the plane, and the second outer convex ring 2-4 is fitted onto the first outer convex ring 1-3. In the initial state, the end face of the second outer convex ring 2-4 is in contact with the second stop, and the end face of the first outer convex ring 1-3 is in contact with the second disc body connecting part 2-7, forming a second pulley groove. Two-stage transmission speed change is achieved through pulley grooves with different working diameters.

[0023] See Figure 1 , 3 As shown, the first movable plate 1 and the second movable plate 2 of the present invention have corresponding notches on the first inner inclined surface 1-1 and the second movable plate 2 on the second inner inclined surface 2-1. The first inner inclined surface 1-1 has a first notch 1-7, and the second inner inclined surface 2-1 has a second notch 2-9. During assembly, the mounting surface can be quickly identified, improving the assembly speed. The first movable plate 1 and the second movable plate 2 of the present invention also have corresponding notches on the first outer inclined surface 1-2 and the second movable plate 2 on the second outer inclined surface 2-2, which further improves the assembly speed.

[0024] See Figure 1 , 2 As shown, the inner hole of the first inner convex ring 1-4 of the present invention is fitted onto the outer periphery of the second inner convex ring 2-6. The end face of the first inner convex ring 1-4 is connected to the first stop 2-3, and the end face of the second inner convex ring 2-6 is connected to the first disc body connecting part 1-5. Adjusting shims 5 are installed on both sides of the flange 3-2. Fasteners install the adjusting shims 5, the first movable disc 1, and the second movable disc 2 on the flange 3-2, thus forming the first pulley groove and realizing first-level speed regulation. If it is necessary to adjust the groove width of the first pulley groove again, it can be adjusted by increasing or decreasing the number of adjusting shims 5 in pairs. Without changing the center plane of the groove opening, the working diameter of the pulley is changed to change the transmission ratio, which can achieve multi-gear and fixed-gear speed regulation. When there is a deviation in the alignment of the two pulleys, adjusting shims 5 can be placed, or the adjusting shim 5 on one side can be placed at the adjusting shim 5 on the other side to achieve fine adjustment of the center plane of the pulley groove opening.

[0025] like Figure 3 , 4 As shown, first loosen the fasteners, flip the first movable disc 1 and the second movable disc 2 to change their installation positions. The end face of the first outer convex ring 1-3 connects with the second stop 2-3, and the end face of the second outer convex ring 2-4 connects with the first disc body connecting part 1-5. Adjusting shims 5 are installed on both sides of the flange 3-2. The fasteners install the adjusting shims 5, the first movable disc 1, and the second movable disc 2 on the flange 3-2, forming the second pulley groove, thus achieving two-stage speed regulation. If the groove width of the second pulley needs to be adjusted again, it can be adjusted by adding or removing the number of adjusting shims 5 in pairs. Without changing the center plane of the groove opening, the working diameter of the pulley is changed to change the transmission ratio, achieving two-stage multi-gear and fixed-gear speed regulation. When there is a misalignment between the two pulleys, adjusting shims 5 can be placed, or the adjusting shim on one side can be placed at the position of the adjusting shim on the other side to achieve fine adjustment of the center plane of the pulley groove opening.

Claims

1. A double-sided speed-regulating pulley mechanism, characterized in that: It includes a middle fixed seat (3), a first movable plate (1), a second movable plate (2), and an adjusting shim (5); The intermediate fixing seat (3) is used to connect the first movable plate (1) and the second movable plate (2), including a plate body with a central hole (3-1), and a raised flange (3-2) on the outer periphery of the intermediate fixing seat (3), and the flange (3-2) has at least three axial intermediate mounting holes (3-1) along the circumference. The first movable disc (1) includes a first hole coaxial with the center line of the intermediate fixed seat (3) and a first disc body connecting part (1-5) corresponding to one side of the flange (3-2). The first disc body connecting part (1-5) is provided with a first mounting hole (1-6) corresponding to the intermediate mounting hole (3-1). The two sides of the first movable disc (1) are respectively provided with a first inner convex ring (1-4) and a first outer convex ring (1-3) with different outer diameters. The outer side of the first inner convex ring (1-4) to the outer periphery of the first movable disc (1) has an inclined first inner inclined surface (1-1), and the outer side of the first outer convex ring (1-3) to the outer periphery of the first movable disc (1) has an inclined first outer inclined surface (1-2). The second movable disc (2) includes a second hole coaxial with the center line of the intermediate fixed seat (3) and a second disc body connecting part (2-7) corresponding to the other side of the flange (3-2). The second disc body connecting part (2-7) is provided with a second mounting hole (2-8) corresponding to the intermediate mounting hole (3-1). The two sides of the second movable disc (2) are respectively provided with a second inner convex ring (2-6) and a second outer convex ring (2-4) with different outer diameters. The outer side of the second inner convex ring (2-6) to the outer periphery of the second movable disc (2) has an inclined second inner inclined surface (2-1), and the outer side of the second outer convex ring (2-4) to the outer periphery of the second movable disc (2) has an inclined second outer inclined surface (2-2). The first hole of the first movable disc (1) and the second hole of the second movable disc (2) are located on both sides of the flange (3-2). The first disc body connecting part (1-5) and the second disc body connecting part (2-7) are connected to the flange (3-2) by fasteners. When the first inner convex ring (1-4) on the first movable disc (1) is in contact with the second inner convex ring (2-6) of the second movable disc (2), the first inner inclined surface (1-1) and the second inner inclined surface (2-1) form a V-shaped first pulley groove; the first outer convex ring (1-3) on the first movable disc (1) and the second outer convex ring (2) of the second movable disc (2) are in contact with the second inner convex ring (2-6) of the second movable disc (2). When the second outer convex ring (2-4) is connected, the first outer inclined surface (1-2) and the second outer inclined surface (2-2) form a V-shaped second pulley groove; the groove opening angle of the first pulley groove is the same as the groove opening angle of the second pulley groove, and the diameter difference between the bottom diameter D1 of the first pulley groove and the bottom diameter D2 of the second pulley groove is greater than 6mm; the center plane of the first pulley groove and the center plane of the second pulley groove are located on the same plane; the adjusting shims (5) used to adjust the groove width of the first pulley groove and the groove width of the second pulley groove and the corresponding groove opening center plane are set on both sides or any side of the flange (3-2).

2. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The second movable disc (2) transitions to the second inner inclined surface (2-1) through a plane on the outside of the second inner convex ring (2-6). The second inner convex ring (2-6) and the plane form a first stop (2-5). The first inner convex ring (1-4) is fitted onto the second inner convex ring (2-6). In the initial state, the end face of the first inner convex ring (1-4) is connected to the first stop (2-5), and the end face of the second inner convex ring (2-6) is connected to the first disc body connecting part (1-5).

3. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The second movable disc (2) transitions to the second outer inclined surface (2-2) through a plane on the outside of the second outer convex ring (2-4). The second outer convex ring (2-4) and the plane form a second stop (2-3). The first outer convex ring (1-3) is fitted onto the second outer convex ring (2-4). In the initial state, the end face of the first outer convex ring (1-3) is connected to the second stop (2-3), and the end face of the second outer convex ring (2-4) is connected to the first disc body connecting part (1-5).

4. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The first movable disc (1) transitions to the first inner inclined surface (1-1) through a plane on the outside of the first inner convex ring (1-4). The first inner convex ring (1-4) and the plane form a first stop. The second inner convex ring (2-6) is fitted onto the first inner convex ring (1-4). In the initial state, the end face of the second inner convex ring (2-6) is connected to the first stop, and the end face of the first inner convex ring (1-4) is connected to the second disc body connecting part (2-7).

5. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The first movable disc (1) transitions to the first outer inclined surface (1-2) through a plane on the outside of the first outer convex ring (1-3). The first outer convex ring (1-3) and the plane form a second stop. The second outer convex ring (2-4) is fitted onto the first outer convex ring (1-3). In the initial state, the end face of the second outer convex ring (2-4) is connected to the second stop, and the end face of the first outer convex ring (1-3) is connected to the second disc body connecting part (2-7).

6. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The center plane of the flange (3-2) of the intermediate fixed seat (3) coincides with the center plane of the first pulley groove and the center plane of the second pulley groove.

7. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The diameter difference between the bottom diameter D1 of the first pulley groove and the bottom diameter D2 of the second pulley groove is between 10 and 100 mm.

8. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The bottom diameter D2 of the second pulley groove is greater than the bottom diameter D1 of the first pulley groove; or the bottom diameter D2 of the second pulley groove is less than the bottom diameter D1 of the first pulley groove.

9. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The fasteners include bolts (4), anti-loosening washers (7) and nuts (6). The bolts (4) pass through the first mounting hole (1-6) of the first disc body connecting part (1-5), the hole on the corresponding adjusting shim (5), the middle mounting hole (3-1) of the flange (3-2), and the second mounting hole (2-8) of the second disc body connecting part (2-7). The anti-loosening washers (7) and nuts (6) are installed on the bolts to connect the first movable disc (1), the adjusting shim (5), and the second movable disc (2) to the intermediate fixed seat (3). The outer end face of the first disc body connecting part (1-5) and the outer end face of the second disc body connecting part (2-7) are also provided with shims.

10. The double-sided speed-regulating pulley mechanism according to claim 1, characterized in that: The first movable plate (1) has a corresponding notch on the first inner inclined surface (1-1) and the second movable plate (2) has a corresponding notch on the second inner inclined surface (2-1), or the first movable plate (1) has a corresponding notch on the first outer inclined surface (1-2) and the second movable plate (2) has a corresponding notch on the second outer inclined surface (2-2).

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