Bolt tightening device

Abstract

The utility model provides a bolt tightening device which comprises an installation shell, a synchronous transmission assembly is installed in the installation shell and comprises a plurality of transmission wheels, a synchronous belt is connected among the transmission wheels, the transmission wheels are arranged in a polygon shape, one transmission wheel is connected with a driving assembly, and the other transmission wheel is connected with a transmission shaft. The driving assembly is mounted in the center of the mounting shell, and a power input part is connected to the driving assembly; each transmission wheel is connected with an output assembly, one end of each output assembly extends out of the mounting shell, and the outer end of each output assembly is connected with a combined sleeve. According to the device, the driving assembly drives the transmission wheels to work at the same time, then synchronous rotation of the output assemblies is achieved, the output assemblies are matched with the combined sleeve to synchronously tighten a plurality of bolts, it is ensured that each transmission wheel can be evenly stressed when the bolts are tightened, the failure rate is effectively reduced, the overhauling or assembling time is greatly shortened, and the production efficiency is improved. And the maintenance or assembly efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of bolt tightening equipment, specifically to a bolt tightening device. Background Technology

[0002] Bolt tightening is a fundamental operation in the assembly and maintenance of various industrial equipment. It is widely used in fields such as machinery manufacturing, automotive industry, aerospace, and construction engineering. The reliability and precision of bolt connections directly affect the overall performance and service life of the equipment.

[0003] With the development of industrial automation, traditional bolt tightening methods have been gradually replaced by electric and pneumatic tools, greatly improving work efficiency and tightening accuracy. However, existing bolt tightening technologies still have some limitations, especially in scenarios involving multiple bolt assemblies or high-precision requirements. Currently, common bolt tightening tools on the market mainly include electric wrenches, pneumatic wrenches (also known as air wrenches), and hydraulic wrenches. Although these tools are more efficient than traditional manual wrenches, their working method is mostly to tighten individual bolts or nuts one by one. When there are many bolts on the assembled parts, this method of tightening one by one is not only time-consuming but also inefficient. For example, in the assembly of large mechanical equipment, wind turbine generators, or heavy vehicles, it is often necessary to tighten dozens or even hundreds of bolts. Operating them one by one will significantly extend the assembly time and affect the overall production efficiency. Furthermore, in the assembly of some components with high requirements for tightening torque, tightening bolts one by one may lead to uneven stress distribution on each bolt of the installed component. Due to differences in the tightening sequence and torque control, the assembly may experience local deformation or stress concentration, thereby affecting the assembly accuracy and long-term reliability of the equipment. For example, in the assembly of engine cylinder heads, flange connections, or large bearing housings, uneven bolt stress distribution may lead to seal failure, loose connections, or even equipment damage. In addition, the challenges of bolt tightening are even more prominent in field or outdoor emergency repair operations. For example, when repairing large construction machinery, wind power generation equipment, or heavy transport vehicles, due to the complex working environment, limited space, and large size of the equipment, the traditional method of tightening bolts one by one is not only time-consuming and labor-intensive, but may also lead to difficulty in ensuring tightening quality due to inconvenient operation. Utility Model Content

[0004] To address the problems of low efficiency, uneven stress distribution, and inconvenient operation of existing bolt tightening devices in scenarios such as multi-bolt assembly, high precision requirements, and field operations, this utility model provides a bolt tightening device.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model proposes a bolt tightening device, including a mounting housing, in which a synchronous transmission assembly is installed. The synchronous transmission assembly includes multiple transmission wheels, which are connected by a synchronous belt. The multiple transmission wheels are arranged in a polygonal pattern. One of the transmission wheels is connected to a drive assembly, which is installed at the center of the mounting housing. A power input component is connected to the drive assembly.

[0007] Each of the drive wheels is connected to an output component, one end of which extends out of the mounting housing, and a combined sleeve is connected to the outer end of the output component.

[0008] Preferably, the output component includes a drive shaft, which is concentrically arranged with the drive wheel. A first tightening shaft is connected to one end of the drive shaft away from the drive wheel. A connecting rod is provided at one end of the first tightening shaft away from the drive shaft. An adjusting rod is provided at one end of the connecting rod away from the first tightening shaft. A second tightening shaft is connected to the adjusting rod. The combined sleeve is connected to one end of the second tightening shaft away from the adjusting rod.

[0009] The second tightening shaft is provided with a guide hole and a limiting hole. The guide hole communicates with the limiting hole. The adjusting rod is installed in the guide hole. A baffle is provided at the end of the adjusting rod and is installed in the limiting hole.

[0010] The adjusting rod is provided with a first ball, and the inner wall of the guide hole is provided with a plurality of second slots along the axial direction of the second tightening shaft, and the first ball is engaged in one of the second slots.

[0011] Preferably, the drive assembly includes a large pulley and a small pulley, the large pulley is mounted at the center of the mounting housing and the power input component is concentrically connected to the large pulley, and the small pulley is mounted on one of the transmission wheels;

[0012] A drive belt connects the large pulley and the small pulley.

[0013] Preferably, the drive assembly includes a first sprocket and a second sprocket, the first sprocket is mounted at the center of the mounting housing and the power input component is concentrically connected to the first sprocket, and the second sprocket is mounted on one of the transmission wheels;

[0014] A drive chain connects the second sprocket and the first sprocket.

[0015] Preferably, the power input component includes an input shaft, which is concentrically arranged with the large pulley or the first sprocket. A connector is provided on the end of the input shaft away from the large pulley or the first sprocket, and the connector is used to connect to the driver.

[0016] Preferably, the combined sleeve includes a universal sleeve, which is fixed on the second tightening shaft, and a large sleeve is detachably connected to the universal sleeve.

[0017] Preferably, a first slot is provided on the inner wall of the large sleeve;

[0018] The universal sleeve is provided with a mounting groove, a top spring is installed in the mounting groove, a top block is connected to the top spring, a second top ball is connected to the top of the top block, and the second top ball is installed in the first slot.

[0019] A limiting platform is provided on the side of the top block, and a limiting groove is provided in the mounting groove, with the limiting platform installed in the limiting groove.

[0020] Preferably, a tensioning assembly is provided inside the mounting housing, and one side of the tensioning assembly is attached to the timing belt;

[0021] The tensioning assembly includes a mounting plate with a through hole. A threaded rod passes through the through hole. A wheel frame is connected to one end of the threaded rod opposite to the timing belt. A tensioning wheel is rotatably mounted in the wheel frame. The outer wall of the tensioning wheel is in contact with the outer wall of the timing belt.

[0022] A spring is provided on the threaded rod between the mounting plate and the wheel frame. An adjusting nut is screwed onto the end of the threaded rod away from the timing belt, and one side of the adjusting nut is attached to the mounting plate.

[0023] Preferably, the mounting housing is provided with an adjustment groove, and a positioning component is installed in the adjustment groove. The positioning component includes a positioning plate and a guide block slidably installed in the adjustment groove. The guide block is provided with a connection hole, and the output component passes through the connection hole.

[0024] The positioning plate is installed inside the mounting housing. The positioning plate is provided with a positioning hole, and a positioning rod passes through the positioning hole. One end of the positioning rod away from the positioning plate is connected to the guide block, and a positioning nut is screwed onto the positioning rod at a position that fits against the positioning plate.

[0025] Preferably, a scale is provided on the side of the adjustment groove on the mounting housing.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] This utility model proposes a bolt tightening device. This device uses a drive component in a synchronous transmission assembly to drive multiple transmission wheels to work simultaneously. Each transmission wheel is equipped with an output component, thereby realizing the synchronous rotation of multiple output components. In conjunction with the combined sleeve, multiple bolts are tightened synchronously, ensuring that each transmission wheel can be evenly stressed when tightening the bolt, effectively reducing the failure rate. Compared with the method of tightening individual bolts or (nuts) one by one during maintenance or assembly, it greatly shortens the maintenance or assembly time and improves the maintenance or assembly efficiency.

[0028] Furthermore, this device has a guide hole on the second tightening shaft, an adjusting rod installed in the guide hole, and then, in conjunction with the second slot and the first top ball, the length of the output component can be adjusted. This allows the device to be adjusted according to the different positions of bolts that are not on the same plane, thus improving the practicality of the device.

[0029] Furthermore, by incorporating a universal sleeve and a large sleeve in the sleeve assembly, this device can tighten bolts or nuts of different sizes, thereby improving its adaptability and flexibility.

[0030] Furthermore, this device adjusts the positioning wheel through the positioning component, enabling it to tighten bolts at different positions on the same plane. This enhances the stability and reliability of the bolt tightening device, as well as its adaptability and flexibility, allowing it to perform exceptionally well in various bolt tightening operations. Attached Figure Description

[0031] Figure 1 This is one of the structural schematic diagrams of a bolt tightening device proposed in this utility model;

[0032] Figure 2 This is the second structural schematic diagram of a bolt tightening device proposed in this utility model;

[0033] Figure 3 This is the third schematic diagram of the structure of a bolt tightening device proposed in this utility model;

[0034] Figure 4 This is a schematic diagram showing the connection between the synchronous transmission component and the mounting shell in a bolt tightening device proposed in this utility model;

[0035] Figure 5 This is a front view of the bolt tightening device of the present invention, showing the structure of removing the rear end cover.

[0036] Figure 6 This is a schematic diagram showing the connection of the first tightening shaft, the combined sleeve, and the second tightening shaft in a bolt tightening device proposed in this utility model.

[0037] Figure 7 This is a schematic diagram showing the state of the first and second tightening shafts in a bolt tightening device proposed in this utility model after length adjustment.

[0038] Figure 8 This is a schematic diagram of the structure of the second tightening shaft in a bolt tightening device proposed in this utility model;

[0039] Figure 9 This is a schematic diagram showing the connection between the first tightening shaft and the second tightening shaft in a bolt tightening device proposed in this utility model;

[0040] Figure 10 This is a schematic diagram of the tensioning part in a bolt tightening device proposed in this utility model;

[0041] Figure 11 This is a schematic diagram showing the connection between the rear end cover and the input shaft in a bolt tightening device proposed in this utility model;

[0042] Figure 12 This is a schematic diagram of the structure of the large sleeve in a bolt tightening device proposed in this utility model;

[0043] Figure 13 This is a schematic diagram showing the connection between the large sleeve and the general sleeve in a bolt tightening device proposed in this utility model;

[0044] In the attached diagram: 1. Mounting housing; 10. Adjustment groove; 11. Scale; 2. Rear end cover; 3. Input shaft; 4. First tightening shaft; 40. Connecting rod; 41. Adjusting rod; 42. Second retaining groove; 5. Combination sleeve; 50. Universal sleeve; 51. Large sleeve; 52. First retaining groove; 53. Second top ball; 54. Limiting platform; 55. Limiting groove; 56. Top spring; 57. Mounting groove; 58. Top block; 6. Second tightening shaft; 6 0. Limiting hole; 61. First top ball; 62. Guide hole; 7. Positioning assembly; 70. Positioning plate; 71. Positioning rod; 72. Guide block; 8. Synchronous transmission assembly; 80. Large pulley; 81. Small pulley; 82. Synchronous belt; 83. Transmission wheel; 84. Transmission belt; 9. Tensioning assembly; 90. Wheel frame; 91. Adjusting nut; 92. Spring; 93. Tensioning wheel; 94. Connecting shaft; 95. Mounting plate; 96. Threaded rod. Detailed Implementation

[0045] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0051] See Figures 1-13This utility model proposes a bolt tightening device, including a mounting housing 1, a synchronous transmission component 8 installed inside the mounting housing 1, an output component and a power input component connected to the synchronous transmission component 8, and a combined sleeve 5 provided on the end of the output component away from the synchronous transmission component 8. In use, by clamping the combined sleeve 5 onto the bolt that needs to be tightened, the synchronous transmission component 8 is activated to tighten the bolt.

[0052] See Figure 4 and Figure 5 The synchronous transmission assembly 8 includes multiple transmission wheels 83, which are connected by a synchronous belt 82. When one transmission wheel 83 rotates, the other transmission wheels 83 rotate synchronously. The multiple transmission wheels 83 are arranged in a polygonal pattern inside the mounting housing 1, and the axes of the multiple transmission wheels 83 are parallel to each other. A drive assembly is connected to one of the transmission wheels 83. The drive assembly is installed at the center of the mounting housing 1 and a power input component is connected to the drive assembly.

[0053] See Figure 4 and Figure 5 This application proposes an embodiment of a drive assembly. In this embodiment, the drive assembly includes a large pulley 80 and a small pulley 81. The large pulley 80 is installed at the center of the mounting housing 1, and its axis is parallel to the axis of the transmission wheel 83. A power input component is concentrically connected to the end face of the large pulley 80 away from the output assembly. The small pulley 81 is installed on one of the transmission wheels 83, and the small pulley 81 and the transmission wheel 83 are concentrically arranged. A transmission belt 84 connects the large pulley 80 and the small pulley 81. The power input component drives the large pulley 80 to rotate, and then the transmission belt 84 causes the small pulley 81 to rotate. The small pulley 81 drives multiple transmission wheels 83 to rotate synchronously, thereby driving the output assembly to tighten multiple bolts synchronously, which speeds up the efficiency of field or emergency repairs. Since multiple transmission wheels 83 rotate synchronously, the torque applied to each bolt is the same, resulting in uniform and consistent stress on each bolt.

[0054] This application proposes another embodiment of the drive assembly, in which the drive assembly includes a first sprocket and a second sprocket. The first sprocket is mounted at the center of the mounting housing 1 and a power input component is concentrically connected to the first sprocket. The second sprocket is mounted on one of the transmission wheels 83. A transmission chain connects the second sprocket and the first sprocket.

[0055] See Figures 1-9 Each drive wheel 83 is connected to an output component, one end of which extends out of the mounting housing 1, and a combination sleeve 5 is connected to the outer end of the output component.

[0056] The output component includes a drive shaft, which is concentrically arranged with the drive wheel 83. A first tightening shaft 4 is connected to the end of the drive shaft away from the drive wheel 83. The first tightening shaft 4 has the same axis and outer diameter as the drive shaft. A connecting rod 40 is provided on the end of the first tightening shaft 4 away from the drive shaft. An adjusting rod 41 is provided on the end of the connecting rod 40 away from the first tightening shaft 4. A second tightening shaft 6 is connected to the adjusting rod 41. A combined sleeve 5 is connected to the end of the second tightening shaft 6 away from the adjusting rod 41.

[0057] The second tightening shaft 6 is provided with a guide hole 62 and a limiting hole 60. One end of the guide hole 62 communicates with the limiting hole 60, and the other end of the guide hole 62 passes through the end of the second tightening shaft 6 away from the combined sleeve 5. The adjusting rod 41 is installed in the guide hole 62, and a baffle is provided on the end of the adjusting rod 41 away from the connecting rod 40. The baffle is installed in the limiting hole 60. When the adjusting rod 41 moves a certain distance along the guide hole 62, one end face of the baffle is attached to the end face of the limiting hole 60, limiting the adjusting rod 41. Then the adjusting rod 41 is disengaged from the guide hole 62, and the end face of the adjusting rod 41 away from the connecting rod 40 is closed. A second slot 42 is provided on the end of the 0. Multiple first balls 61 are provided on the inner wall of the guide hole 62 along the axial direction of the second tightening shaft 6. The multiple first balls 61 are arranged at equal intervals along the axial direction of the second tightening shaft 6. The second slot 42 is engaged in one of the first balls 61. When multiple bolts are not installed on the same plane during use, the second slot 42 is adjusted to engage with the corresponding first ball 61, and the length of the adjusting rod 41 is adjusted so that the combined sleeve 5 can engage with the corresponding bolts, thereby tightening multiple bolts that are not on the same plane and improving the practicality of the device.

[0058] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 11 The power input component includes an input shaft 3, which is concentrically arranged with the large pulley 80 or the first sprocket. A connector is provided on the end of the input shaft 3 away from the large pulley 80 or the first sprocket. The connector is used to connect to a driver, which can be a motor or a manual wrench, etc., so that the device can be driven mechanically or manually.

[0059] See Figure 7 , Figure 9 , Figure 12 and Figure 13The combined sleeve 5 includes a universal sleeve 50, which is fixed to the second tightening shaft 6. A large sleeve 51 is detachably connected to the universal sleeve 50. For example, a first groove 52 is provided on the inner wall of the large sleeve 51. An installation groove 57 is provided on the universal sleeve 50. A top spring 56 is installed in the installation groove 57. A top block 58 is connected to the top of the top spring 56. A second top ball 53 is connected to the top of the top block 58. The second top ball 53 is installed in the first groove 52. A limiting platform 54 is symmetrically provided on the side of the top block 58. A limiting groove 55 is provided in the installation groove 57. The limiting platform 54 is installed in the limiting groove 55.

[0060] See Figure 4 , Figure 5 and Figure 10 A tensioning assembly 9 is provided inside the mounting housing 1, and one side of the tensioning assembly 9 is attached to the timing belt 82. The tensioning assembly 9 includes a mounting plate 95, which is fixed inside the mounting housing 1. The mounting plate 95 has a through hole, and a threaded rod 96 passes through the through hole. A wheel frame 90 is connected to one end of the threaded rod 96 relative to the timing belt 82. A connecting shaft 94 is rotatably installed inside the wheel frame 90, and a tensioning wheel 93 is rotatably installed on the connecting shaft 94. The outer wall of the tensioning wheel 93 is attached to the outer wall of the timing belt 82.

[0061] A spring 92 is installed on the threaded rod 96 between the mounting plate 95 and the wheel frame 90. An adjusting nut 91 is screwed onto the threaded rod 96 away from the synchronous belt 82. One side of the adjusting nut 91 is attached to the mounting plate 95. By rotating the adjusting nut 91, the threaded rod 96 is adjusted, and then, in conjunction with the spring 92, the position of the tension wheel 93 is adjusted. This causes the tension wheel 93 to push the synchronous belt 82, increasing the friction between the synchronous belt 82 and the transmission wheel 83, so that the synchronous belt 82 can rotate stably.

[0062] See Figures 1-5 An adjustment groove 10 is provided on the housing 1. A positioning component 7 is installed in the adjustment groove 10. The positioning component 7 includes a positioning plate 70 and a guide block 72 that is slidably installed in the adjustment groove 10. A connection hole is provided on one end face of the guide block 72, and a drive shaft passes through the connection hole.

[0063] The positioning plate 70 is installed on the inner end face of the mounting housing 1. The end face of the positioning plate 70 is provided with a positioning hole, and a positioning rod 71 is inserted through the positioning hole. The end of the positioning rod 71 away from the positioning plate 70 is fixedly connected to the outer wall of the guide block 72. A positioning nut is screwed on the positioning rod 71 at the position that fits against the positioning plate 70. The positioning nut is threadedly connected to the positioning rod 71. When the bolts to be tightened are on the same plane and are not arranged around a point center, the position of the transmission wheel 83 in the mounting housing 1 is adjusted by rotating the positioning thread so that the output shaft corresponds to the bolt, and the device is started to tighten.

[0064] Preferably, a scale 11 is provided on the side of the adjustment groove 10 on the mounting housing 1, and the adjustment efficiency of the transmission wheel 83 can be improved by the scale 11.

[0065] See Figure 1 and Figure 11 A removable rear end cover 2 is provided on the mounting housing 1 at a position away from the adjustment groove 10. The rear end cover 2 is used to prevent some dust from entering the mounting housing 1 and to protect the synchronous transmission assembly 8 installed in the mounting housing 1. This prevents other tools from damaging the synchronous transmission assembly 8 during the storage and use of this device, and also prevents some parts of the synchronous transmission assembly 8 from being damaged and flying out when it is working after a long period of use, which could cause injury to the user.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A bolt tightening device, characterized in that, The system includes a mounting housing (1), in which a synchronous transmission assembly (8) is installed. The synchronous transmission assembly (8) includes multiple transmission wheels (83), and a synchronous belt (82) connects the multiple transmission wheels (83). The multiple transmission wheels (83) are arranged in a polygonal pattern. One of the transmission wheels (83) is connected to a drive assembly. The drive assembly is installed at the center of the mounting housing (1), and a power input component is connected to the drive assembly. Each of the drive wheels (83) is connected to an output component, one end of which extends out of the mounting housing (1), and a combination sleeve (5) is connected to the outer end of the output component.

2. The bolt tightening device according to claim 1, characterized in that, The output component includes a drive shaft, which is concentrically arranged with the drive wheel (83). A first tightening shaft (4) is connected to one end of the drive shaft away from the drive wheel (83). A connecting rod (40) is provided at one end of the first tightening shaft (4) away from the drive shaft. An adjusting rod (41) is provided at one end of the connecting rod (40) away from the first tightening shaft (4). A second tightening shaft (6) is connected to the adjusting rod (41). The combined sleeve (5) is connected to one end of the second tightening shaft (6) away from the adjusting rod (41). The second tightening shaft (6) is provided with a guide hole (62) and a limiting hole (60). The guide hole (62) is connected to the limiting hole (60). The adjusting rod (41) is installed in the guide hole (62). A baffle is provided on the end of the adjusting rod (41). The baffle is installed in the limiting hole (60). The adjusting rod (41) is provided with a second slot (42), and a plurality of first top balls (61) are provided on the inner wall of the guide hole (62) along the axial direction of the second tightening shaft (6), and the second slot (42) is engaged in one of the first top balls (61).

3. A bolt tightening device according to claim 2, characterized in that, The drive assembly includes a large pulley (80) and a small pulley (81). The large pulley (80) is installed at the center of the mounting housing (1) and the power input component is concentrically connected to the large pulley (80). The small pulley (81) is installed on one of the transmission wheels (83). A transmission belt (84) is connected between the large pulley (80) and the small pulley (81).

4. A bolt tightening device according to claim 2, characterized in that, The drive assembly includes a first sprocket and a second sprocket. The first sprocket is mounted at the center of the mounting housing (1) and the power input component is concentrically connected to the first sprocket. The second sprocket is mounted on one of the transmission wheels (83). A drive chain connects the second sprocket and the first sprocket.

5. A bolt tightening device according to claim 3, characterized in that, The power input component includes an input shaft (3), which is concentrically arranged with the large pulley (80). A connector is provided on the end of the input shaft (3) away from the large pulley (80), and the connector is used to connect to the driver.

6. A bolt tightening device according to claim 2, characterized in that, The combined sleeve (5) includes a universal sleeve (50), which is fixed on the second tightening shaft (6), and a large sleeve (51) is detachably connected to the universal sleeve (50).

7. A bolt tightening device according to claim 6, characterized in that, The inner wall of the large sleeve (51) is provided with a first slot (52); The universal sleeve (50) is provided with a mounting groove (57), a top spring (56) is installed in the mounting groove (57), a top block (58) is connected to the top spring (56), a second top ball (53) is connected to the top of the top block (58), and the second top ball (53) is installed in the first slot (52); The top block (58) has a limiting platform (54) on its side, and the mounting groove (57) has a limiting groove (55) inside it. The limiting platform (54) is installed inside the limiting groove (55).

8. A bolt tightening device according to claim 1, characterized in that, A tensioning assembly (9) is provided inside the mounting housing (1), and one side of the tensioning assembly (9) is attached to the timing belt (82). The tensioning assembly (9) includes a mounting plate (95), on which a through hole is provided, and a threaded rod (96) is inserted through the through hole. A wheel frame (90) is connected to one end of the threaded rod (96) relative to the timing belt (82). A tensioning wheel (93) is rotatably installed in the wheel frame (90), and the outer wall of the tensioning wheel (93) is in contact with the outer wall of the timing belt (82). A spring (92) is provided on the threaded rod (96) between the mounting plate (95) and the wheel frame (90). An adjusting nut (91) is screwed onto one end of the threaded rod (96) away from the timing belt (82). One side of the adjusting nut (91) is attached to the mounting plate (95).

9. A bolt tightening device according to claim 1, characterized in that, An adjustment groove (10) is provided on the mounting housing (1), and a positioning component (7) is installed in the adjustment groove (10). The positioning component (7) includes a positioning plate (70) and a guide block (72) slidably installed in the adjustment groove (10). A connection hole is provided on the guide block (72), and the output component passes through the connection hole. The positioning plate (70) is installed inside the mounting housing (1). The positioning plate (70) is provided with a positioning hole, and a positioning rod (71) is inserted through the positioning hole. One end of the positioning rod (71) away from the positioning plate (70) is connected to the guide block (72), and a positioning nut is screwed on the positioning rod (71) at a position that fits against the positioning plate (70).

10. A bolt tightening device according to claim 9, characterized in that, A scale (11) is provided on the side of the adjustment groove (10) on the mounting housing (1).

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