Closed type bolt tightening device

Abstract

The utility model discloses a closed type bolt tightening device, and belongs to the field of tightening devices. The bolt tightening device comprises a shell, an input shaft, an output connector, a transmission part and a connector, wherein the input shaft and the output connector are rotationally mounted in the two ends of the shell respectively; the transmission part is arranged in the shell and used for connecting the output connector with the input shaft; the connector is arranged on the shell and used for connecting the input shaft with an electric gun; the connector comprises a fixed cylinder fixedly arranged at one end, corresponding to the input shaft, of the shell, a connecting shaft rotationally mounted in the fixed cylinder, a first bevel gear fixedly mounted on the input shaft, and a second bevel gear fixedly mounted on the connecting shaft in a sleeving manner and used for being meshed with the first bevel gear; a spline groove for insertion of an output shaft of the electric gun is formed in the end, away from the second bevel gear, of the connecting shaft. The connector of the bolt tightening device is arranged in the length direction of the gear eccentric head, the situation that the connector and an electric gun stop the gear eccentric head from going deep into a narrow space for tightening operation can be effectively avoided, and therefore the application range of a tightening tool is widened.

Description

Technical Field

[0001] This application relates to the field of tightening device technology, specifically a closed-type bolt tightening device. Background Technology

[0002] In the installation of mechanical parts, a large number of bolts are required for fixing. Tightening bolts or nuts mainly relies on wrenches of the same type. However, when dealing with tightening operations in confined spaces, the special shape of the wrench makes it difficult to rotate internally. Therefore, a gear-driven eccentric head is generally used to tighten bolts or nuts in confined spaces that are difficult for ordinary tools to access, transmitting the necessary torque to achieve the tightening of bolts or nuts in narrow spaces.

[0003] Chinese utility model patent application number 202420473630X discloses a gear eccentric head for tightening tools. By placing a wear-resistant shim between the transmission gear and the housing, it effectively reduces the coefficient of friction between the transmission gear and the housing, improving the transmission efficiency and service life of the transmission gear. However, the connector between it and the electric gun is directly coaxially set with the input shaft, and the output head of the connector is inserted into the input shaft for drive. This inevitably increases the thickness of the entire tightening tool in the height direction. With a fixed length of the gear eccentric head, it is difficult to extend into deeper, narrow spaces for tightening operations due to the obstruction of the connector and the electric gun.

[0004] Therefore, this application provides a closed-type bolt tightening device to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a closed-type bolt tightening device, which aims to solve the problem mentioned in the background art that existing bolt tightening devices, when the length of the gear eccentric head is fixed, are difficult to extend into a narrow space for tightening operations due to the obstruction of the connector and electric gun.

[0006] To achieve the above objectives, this application provides the following technical solution: a closed-type bolt tightening device, comprising a housing, an input shaft and an output connector respectively rotatably installed inside both ends of the housing, a transmission component disposed inside the housing for connecting the output connector and the input shaft, and a connector disposed on the housing for connecting the input shaft and an electric gun.

[0007] To enable the bolt tightening device to reach into confined spaces without being limited by the length of the gear eccentric head, allowing for tightening of bolts or nuts, the connector includes a fixed cylinder fixedly mounted on the housing at one end corresponding to the input shaft, a connecting shaft rotatably mounted within the fixed cylinder, a first bevel gear fixedly mounted on the input shaft, and a second bevel gear fixedly fitted on the connecting shaft for meshing with the first bevel gear. The connecting shaft has a spline groove at its end away from the second bevel gear for insertion of the electric gun's output shaft. This spline groove connects the electric gun's output shaft to the connecting shaft, allowing the output shaft to drive the connecting shaft to rotate. The first and second bevel gears then drive the input shaft to rotate, effectively preventing the connector and electric gun from obstructing the tightening tool from reaching into confined spaces, thus making it more convenient to use.

[0008] Preferably, the inner wall of the fixed cylinder at the end away from the housing has a support edge corresponding to the outer position of the connecting shaft;

[0009] The fixed cylinder has at least three bayonets arranged in a ring array at one end away from the housing.

[0010] Preferably, a bearing connected to the fixed cylinder is fitted onto the connecting shaft.

[0011] Preferably, the transmission component includes an input gear and an output gear that are respectively fixedly mounted on the input shaft and the output connector; at least one transmission gear is rotatably mounted inside the housing, which meshes with the input gear and the output gear in sequence.

[0012] Preferably, the housing includes a bottom shell and an upper cover for pressing the input shaft, output connector and transmission component into the bottom shell, one end of the output connector passing through the upper cover, and both the bottom shell and the upper cover have through holes for the locking component to pass through.

[0013] Preferably, a needle roller ring for engaging with the first bevel gear is provided inside the bottom shell at a position corresponding to the outer side of the input shaft.

[0014] Preferably, the fixed cylinder and the bottom shell are integrally formed at one end corresponding to the input shaft.

[0015] This bolt tightening device has a simple structure and is easy to use. The connector is set in the length direction of the gear eccentric head, so that the electric gun is installed in the length direction of the gear eccentric head. This avoids the connector and electric gun blocking the gear eccentric head from entering the narrow space for tightening operations, thereby improving the adaptability of the tightening tool. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a closed-end bolt tightening device;

[0017] Figure 2 This is a schematic diagram of the exploded structure of a closed-type bolt tightening device.

[0018] In the picture:

[0019] 1. Shell;

[0020] 11. Bottom shell;

[0021] 111. Needle roller ring;

[0022] 12. Top cover;

[0023] 2. Input axis;

[0024] 3. Output connector;

[0025] 4. Transmission components;

[0026] 41. Input gear;

[0027] 42. Output gear;

[0028] 43. Transmission gears;

[0029] 5. Connectors;

[0030] 51. Fixed cylinder;

[0031] 511. Support edge; 512. Bayonet;

[0032] 52. Connecting shaft;

[0033] 521. Spline groove; 522. Bearing;

[0034] 53. First bevel gear;

[0035] 54. Second bevel gear. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] This embodiment provides a closed-type bolt tightening device, such as... Figure 1 and Figure 2As shown, the bolt tightening device includes a housing 1, an input shaft 2 and an output connector 3 respectively rotatably installed inside the two ends of the housing 1, a transmission component 4 disposed inside the housing 1 for connecting the output connector 3 and the input shaft 2, and a connector 5 disposed on the housing 1 for connecting the input shaft 2 and the electric gun.

[0038] Unlike existing bolt tightening devices, the connector 5 includes a fixed cylinder 51 fixedly disposed on the housing 1 at one end corresponding to the input shaft 2, a connecting shaft 52 rotatably mounted inside the fixed cylinder 51, a first bevel gear 53 fixedly mounted on the input shaft 2, and a second bevel gear 54 fixedly mounted on the connecting shaft 52 for meshing with the first bevel gear 53; wherein, in order to enable the output shaft of the electric gun to connect with the connecting shaft 52 and drive the connecting shaft 52 to rotate, the end of the connecting shaft 52 away from the second bevel gear 54 is provided with a spline groove 521 for the insertion of the output shaft of the electric gun.

[0039] In use, the output end of the electric gun is inserted into the end of the fixed cylinder 51 furthest from the housing 1, so that its output shaft is inserted into the spline groove 521 of the input shaft 2. Then, the housing 1 is extended into the confined space, and the output connector 3 is applied to the bolt or nut via an adapter. During tightening, the output shaft of the electric gun drives the connecting shaft 52 to rotate. With the cooperation of the first bevel gear 53 and the second bevel gear 54, the input shaft 2 is driven to rotate. Under the action of the transmission component 4, the output connector 3 is driven to rotate on the housing 1, thus tightening the bolt or nut. The output connector 3 is splined, which can be inserted into a bolt cutter bit with a spline groove, driving the bolt cutter bit to rotate, thereby driving the bolt or nut to be tightened to rotate, realizing the tightening operation of the bolt or nut.

[0040] It is understandable that the connector 5 is positioned along the length of the housing 1, which can effectively reduce the thickness of the tightening tool in the height direction, thereby preventing the connector 5 and the electric gun from affecting the housing 1's penetration into narrow spaces. When the length of the housing 1 is insufficient, the output end of the electric gun can be used as a support to extend the connector 5 and the housing 1 into a deeper space to tighten the bolts or nuts inside.

[0041] like Figure 2As shown, to facilitate the docking of the electric gun, the inner wall of the fixed cylinder 51 at the end away from the housing 1 has a support edge 511 corresponding to the outer side of the connecting shaft 52. When the output end of the electric gun is inserted into the connecting shaft 52, the support edge 511 limits and supports the outer shell portion of the corresponding output end of the electric gun. To facilitate the connection between the electric gun and the fixed cylinder 51, the end of the fixed cylinder 51 away from the housing 1 has at least three bayonet slots 512 arranged in a circular array. In use, a positioning block can be provided on the outer wall of the electric gun. When the output shaft of the electric gun is inserted into the connecting shaft 52, the positioning block engages in the bayonet slots 512, thus fixing the electric gun onto the fixed cylinder 51.

[0042] It should be noted that, in order to enable the connecting shaft 52 to rotate on the fixed cylinder 51 and avoid friction between the connecting shaft 52 and the fixed cylinder 51, so as to make its rotation smooth, a bearing 522 connected to the fixed cylinder 51 is fitted on the connecting shaft 52.

[0043] like Figure 2 As shown, in order to achieve the transfer of kinetic energy and drive the output connector 3 to rotate, thereby tightening the bolt or nut, the transmission component 4 includes an input gear 41 and an output gear 42, which are respectively fixedly mounted on the input shaft 2 and the output connector 3. Inside the housing 1, at least one transmission gear 43 is rotatably mounted, meshing sequentially with the input gear 41 and the output gear 42. When the input shaft 2 rotates, the output connector 3 is driven to rotate by the input gear 41, the transmission gear 43, and the output gear 42, thus achieving the transfer of kinetic energy.

[0044] It should be noted that when there are multiple transmission gears 43, two adjacent transmission gears 43 mesh, and the transmission gear 43 at one end of the transmission gear set meshes with the input gear 41, while the transmission gear 43 at the other end meshes with the output gear 42.

[0045] Example 2

[0046] To facilitate the production, assembly, and maintenance of the tightening device, unlike Example 1, as follows: Figure 1 and Figure 2 As shown, the housing 1 includes a bottom shell 11 and an upper cover 12 for pressing the input shaft 2, the output connector 3 and the transmission component 4 into the bottom shell 11. One end of the output connector 3 passes through the upper cover 12. Both the bottom shell 11 and the upper cover 12 have through holes for the locking component to pass through.

[0047] The housing 1 adopts a detachable design of bottom shell 11 and top cover 12. The input shaft 2, output connector 3 and transmission component 4 can be placed inside the bottom shell 11. The input shaft 2, output connector 3 and transmission component 4 are pressed into the bottom shell 11 by the top cover 12. The top cover 12 is fixed to the bottom shell 11 by bolts and other locking devices. This facilitates disassembly and assembly, and also facilitates lubrication and maintenance of the transmission component 4.

[0048] It should be noted that, in order to ensure smooth rotation of the input shaft 2 and avoid wear caused by contact between the second bevel gear 53 and the housing, a needle roller ring 111 for engaging with the first bevel gear 53 is provided inside the bottom housing 11 at a position corresponding to the outer side of the input shaft 2.

[0049] The fixed cylinder 51 and the bottom shell 11 are integrally formed at one end of the input shaft 2, and the upper cover 12 has an arc groove that is pressed onto the fixed cylinder 51.

[0050] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A closed-type bolt tightening device, comprising a housing (1), an input shaft (2) and an output connector (3) respectively rotatably mounted inside both ends of the housing (1), a transmission component (4) disposed inside the housing (1) for connecting the output connector (3) to the input shaft (2), and a connector (5) disposed on the housing (1) for connecting the input shaft (2) to an electric gun. characterized in that The connector (5) includes a fixed cylinder (51) fixedly disposed on the housing (1) at one end corresponding to the input shaft (2), a connecting shaft (52) rotatably mounted in the fixed cylinder (51), a first bevel gear (53) fixedly mounted on the input shaft (2), and a second bevel gear (54) fixedly mounted on the connecting shaft (52) for meshing with the first bevel gear (53). The connecting shaft (52) has a spline groove (521) at one end away from the second bevel gear (54) for inserting the output shaft of the electric gun.

2. The closed bolt tightening device according to claim 1, characterized in that: The fixed cylinder (51) has a support edge (511) on the inner wall of the end away from the housing (1) corresponding to the outer position of the connecting shaft (52). The fixed cylinder (51) has at least three slots (512) arranged in a ring array at one end away from the housing (1).

3. The closed bolt tightening device of claim 1, wherein: The connecting shaft (52) is fitted with a bearing (522) that is connected to the fixed cylinder (51).

4. The closed bolt tightening device of claim 1, wherein: The transmission component (4) includes an input gear (41) and an output gear (42) that are respectively fixedly mounted on the input shaft (2) and the output connector (3). The housing (1) is rotatably mounted inside at least one transmission gear (43) that meshes sequentially with the input gear (41) and the output gear (42).

5. The closed bolt tightening device of claim 1, wherein: The housing (1) includes a bottom shell (11) and an upper cover (12) for pressing the input shaft (2), output connector (3) and transmission component (4) into the bottom shell (11). One end of the output connector (3) passes through the upper cover (12). Both the bottom shell (11) and the upper cover (12) have through holes for the locking component to pass through.

6. The closed bolt tightening device of claim 5, wherein: The bottom shell (11) is provided with a needle roller ring (111) for engaging with the first bevel gear (53) at the position corresponding to the outer side of the input shaft (2).

7. The closed bolt tightening device of claim 5, wherein: The fixed cylinder (51) and the bottom shell (11) are integrally formed at one end of the input shaft (2).

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