Protective sleeve for transmission shaft of bolt tightening machine

Abstract

The utility model relates to the technical field of bolt tightening equipment, in particular to a protective sleeve for a transmission shaft of a bolt tightening machine, which comprises a transmission shaft and a protective sleeve main body sleeved on the transmission shaft, the protective sleeve main body comprises a large protective sleeve and a small protective sleeve, and the transmission shaft comprises a main body part and a head part of which the size is smaller than that of the main body part. A first clamping groove matched with the main body part is formed in the lower end of the large sheath, a mounting groove matched with the small sheath is formed in the upper end of the large sheath, the first clamping groove is communicated with the mounting groove, the lower end of the small sheath is embedded into the mounting groove, a second clamping groove matched with the head part is formed in the lower end of the small sheath, and the head part penetrates through the first clamping groove and is embedded into the second clamping groove. A containing groove matched with a bolt to be tightened is formed in the upper end of the small sheath, and a positioning bolt penetrating through the large sheath, the small sheath and the head is further arranged on the sheath body. The transmission shaft can be effectively protected, the service life of the transmission shaft can be guaranteed, the transmission shaft is not prone to being broken, production efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt tightening equipment, in particular to a protective sleeve for a transmission shaft of a bolt tightening machine. Background Technique

[0002] At present, engine flywheel bolts are generally tightened by a bolt tightening machine. The head of the transmission shaft of the bolt tightening machine has a groove adapted to the nut. By aligning the transmission shaft of the bolt tightening machine with the engine flywheel bolt and starting the bolt tightening machine, the engine flywheel bolt can be tightened. However, since the transmission shaft of the existing bolt tightening machine is generally a slender square shaft and there is a certain dimensional difference between its head and the main body part of the transmission shaft, the transmission shaft is prone to break after being used for a certain period of time, which affects the tightening efficiency of the engine bolts, and replacing a new transmission shaft also increases the production cost. Content of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a protective sleeve for a transmission shaft of a bolt tightening machine.

[0004] The utility model provides the following technical solution. A protective sleeve for a transmission shaft of a bolt tightening machine includes a transmission shaft and a sheath main body sleeved on the transmission shaft. The sheath main body includes a large sheath and a small sheath. The transmission shaft includes a main body part and a head with a size smaller than the main body part. The lower end of the large sheath is provided with a first clamping groove adapted to the main body part. The upper end of the large sheath is provided with an installation groove adapted to the small sheath, and the first clamping groove communicates with the installation groove. The lower end of the small sheath is embedded in the installation groove, and the lower end of the small sheath is provided with a second clamping groove adapted to the head. The head penetrates through the first clamping groove and is embedded in the second clamping groove. The upper end of the small sheath is provided with a receiving groove adapted to the bolt to be tightened. The sheath main body is also provided with positioning bolts that respectively penetrate through the large sheath, the small sheath and the head.

[0005] For the protective sleeve of the transmission shaft of the bolt tightening machine in an embodiment of the utility model, by arranging the large sheath on the main body part and then arranging the small sheath on the head, and at the same time the small sheath is embedded in the installation groove of the large sheath. Moreover, since the transmission shaft is a square shaft, when the tightening machine drives the transmission shaft to rotate, both the large sheath and the small sheath will rotate. Finally, with the cooperation of the positioning bolts, the large sheath, the small sheath and the transmission shaft are fixed to each other to form an integral structure. When the bolt to be tightened is embedded in the receiving groove, the force applied by the tightening machine to the transmission shaft will be dispersed to the large sheath and the small sheath, thereby completing the tightening work of the engine flywheel bolt, realizing the effective protection of the transmission shaft, indirectly improving the mechanical strength of the transmission shaft, ensuring the service life of the transmission shaft, not being prone to break, improving the production efficiency and reducing the production cost.

[0006] Further, the cross-section of the first card slot is square, and the length of the first card slot is between 1 / 2 and 2 / 3 of the length of the main body part.

[0007] Further, a limiting ring is provided on the inner wall of the upper end of the first card slot. The inner hole of the limiting ring is communicated with the installation slot. The size of the inner hole of the limiting ring is the same as the size of the head. The upper end of the main body part abuts against the lower end of the limiting ring.

[0008] Further, the cross-section of the second card slot is square, and there is a gap between the upper end of the head and the inner bottom surface of the second card slot.

[0009] Further, the receiving groove is adapted to the nut or bolt nut to be tightened.

[0010] Further, the positioning bolt includes a positioning screw rod and a positioning nut. The positioning screw rod penetrates through the large sheath, the small sheath and the head respectively, and a positioning nut is provided at one end of the positioning screw rod extending out of the side wall of the large sheath.

[0011] Further, a first receiving hole communicated with the installation slot is provided on the side wall of the large sheath. The positioning nut is embedded in the first receiving hole and is adapted to it. A second receiving hole communicated with the installation slot is also provided on the side wall of the large sheath. The second receiving hole corresponds to the first receiving hole. One end of the positioning screw rod away from the positioning nut is located in the second receiving hole. The thickness of the positioning nut is less than the depth of the second receiving hole, and the outer diameter of the positioning nut is less than the aperture of the second receiving hole.

[0012] Further, the cross-section of the positioning nut is a regular polygon structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of the front internal structure of the protective sleeve for the transmission shaft of the bolt tightening machine of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the protective sleeve for the transmission shaft of the bolt tightening machine of the present invention;

[0016] Figure 3Schematic diagram of the internal structure of the side of the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model;

[0017] Figure 4 Schematic diagram of the structure of the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model after removing the transmission shaft;

[0018] Figure 5 Schematic cross-sectional view of the large protective sleeve in the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model;

[0019] Figure 6 Schematic top view of the large protective sleeve in the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model;

[0020] Figure 7 Schematic top view of the small protective sleeve in the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model;

[0021] Figure 8 Schematic bottom view of the small protective sleeve in the protective sleeve for the transmission shaft of the bolt tightening machine of the present utility model.

[0022] Explanation of reference numerals:

[0023] 10. Transmission shaft; 11. Main body part; 12. Head; 20. Sheath main body; 21. Large protective sleeve; 211. First card slot; 212. Installation groove; 213. Limit ring; 214. First accommodation hole; 215. Second accommodation hole; 22. Small protective sleeve; 221. Second card slot; 222. Accommodation groove; 30. Positioning bolt; 31. Positioning screw; 32. Positioning nut; 33. Positioning nut. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the embodiments of the present utility model, and should not be construed as a limitation to the present utility model.

[0025] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0027] In the embodiments of the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0028] Referring to Figures 1 to 8 , in an embodiment of the present utility model, a protective sleeve for the transmission shaft 10 of a bolt tightening machine includes the transmission shaft 10 and a sheath main body 20 sleeved on the transmission shaft 10. The sheath main body 20 includes a large sheath 21 and a small sheath 22. The transmission shaft 10 includes a main body portion 11 and a head 12 with a size smaller than that of the main body portion 11. The lower end of the large sheath 21 is provided with a first card slot 211 adapted to the main body portion 11. The upper end of the large sheath 21 is provided with a mounting groove 212 adapted to the small sheath 22, and the first card slot 211 communicates with the mounting groove 212. The lower end of the small sheath 22 is embedded in the mounting groove 212, and the lower end of the small sheath 22 is provided with a second card slot 221 adapted to the head 12. The head 12 passes through the first card slot 211 and is embedded in the second card slot 221. The upper end of the small sheath 22 is provided with a receiving groove 222 adapted to the bolt to be tightened. The sheath main body 20 is further provided with positioning bolts 30 that respectively penetrate the large sheath 21, the small sheath 22, and the head 12.

[0029] A protective sleeve for the transmission shaft 10 of a bolt tightening machine according to an embodiment of the present utility model. By arranging a large protective sleeve 21 on the main body portion 11 and then arranging a small protective sleeve 22 on the head portion 12, and at the same time, the small protective sleeve 22 is embedded in the installation groove 212 of the large protective sleeve 21. Moreover, since the transmission shaft 10 is a square shaft, when the tightening machine rotates with the transmission shaft 10, both the large protective sleeve 21 and the small protective sleeve 22 will rotate. Finally, with the cooperation of the positioning bolt 30, the large protective sleeve 21, the small protective sleeve 22 and the transmission shaft 10 are fixed to each other to form an integral structure. When the bolt to be tightened is embedded in the accommodation groove 222, the force applied by the tightening machine to the transmission shaft 10 will be dispersed to the large protective sleeve 21 and the small protective sleeve 22, thereby completing the tightening work of the engine flywheel bolt, realizing the effective protection of the transmission shaft 10, indirectly improving the mechanical strength of the transmission shaft 10, ensuring the service life of the transmission shaft 10, not being easily broken, improving the production efficiency and reducing the production cost.

[0030] The cross-section of the first card slot 211 is square, and the length of the first card slot 211 is between 1 / 2 and 2 / 3 of the length of the main body portion 11; a limiting ring 213 is arranged on the upper inner wall of the first card slot 211, the inner hole of the limiting ring 213 is communicated with the installation groove 212, the size of the inner hole of the limiting ring 213 is the same as the size of the head portion 12, and the upper end of the main body portion 11 abuts against the lower end of the limiting ring 213; the first card slot 211 with a square cross-section can hold the main body portion 11 to prevent the main body portion 11 from rotating in the first card slot 211. The length of the main body portion 11 embedded in the first card slot 211 can extend the distance for the transmission shaft 10 to transmit stress to the large protective sleeve 21, ensuring the service life of the transmission shaft 10 and not being easily broken. If this length is too small, it will affect the protection effect of the large protective sleeve 21 on the transmission shaft 10. If this length is too large, it will affect the installation and disassembly of the protective sleeve main body 20; in this embodiment, the length of the first card slot 211 is 1 / 2 of the length of the main body portion 11; the limiting ring 213 can limit the main body portion 11 to prevent it from passing through the first card slot 211 and entering the installation groove 212, and it is also convenient for the installation of the large protective sleeve 21. During specific installation, only need to put the large protective sleeve 21 on the transmission shaft 10.

[0031] The cross-section of the second card slot 221 is square, and there is a gap between the upper end of the head portion 12 and the inner bottom surface of the second card slot 221; the accommodation groove 222 is adapted to the nut or nut of the bolt to be tightened; the first card slot 211 with a square shape can hold the head portion 12, so that the rotational force of the head portion 12 is effectively transmitted to the small protective sleeve 22, and there is a gap between the top end of the head portion 12 and the inner bottom surface of the second card slot 221, which has a certain heat dissipation effect on the head portion 12 and can prevent the inner wall of the head portion 12 and the first card slot 211 from overheating due to friction, affecting the strength of the head portion 12; the structure of the accommodation groove 222 can realize the tightening work of the small protective sleeve 22 on the bolt to be tightened; in this embodiment, the cross-section of the accommodation groove 222 is hexagonal, that is, adapted to a hexagonal nut or hexagonal nut.

[0032] The positioning bolt 30 includes a positioning screw rod 31 and a positioning nut 32. The positioning screw rod 31 passes through the large sheath 21, the small sheath 22 and the head 12 respectively, and a positioning nut 33 is provided at one end of the positioning screw rod 31 extending out of the side wall of the large sheath 21. The positioning screw rod 31 can effectively fixedly connect the large sheath 21, the small sheath 22 and the transmission shaft 10 into a whole, so that the rotational force on the transmission shaft 10 can be effectively dispersed to the large sheath 21 and the small sheath 22, effectively protecting the transmission shaft 10. In this embodiment, through holes adapted to the positioning screw rod 31 are provided on the side wall of the small sheath 22, and through holes adapted to the positioning screw rod 31 are also provided on the head 12.

[0033] The side wall of the large sheath 21 is provided with a first receiving hole 214 communicating with the mounting groove 212. The positioning nut 32 is embedded in the first receiving hole 214 and is adapted to it. The side wall of the large sheath 21 is also provided with a second receiving hole 215 communicating with the mounting groove 212. The second receiving hole 215 corresponds to the first receiving hole 214. One end of the positioning screw rod 31 away from the positioning nut 32 is located in the second receiving hole 215, and the thickness of the positioning nut 33 is less than the depth of the second receiving hole 215, and the outer diameter of the positioning nut 33 is less than the aperture of the second receiving hole 215. The cross section of the positioning nut 32 is a regular polygon structure. The first receiving hole 214 can hide the positioning nut 32, and the second receiving hole 215 can hide the protruding positioning screw rod 31 and the positioning nut 33, which can avoid interference of the positioning bolt 30 with other engine flywheel bolts and ensure the stable operation of the transmission shaft 10. The outer diameter of the positioning nut 33 is less than that of the second receiving hole 215, which is convenient for the installation and disassembly of the positioning nut 33. The structure of the positioning nut 32 can prevent its self-rotation, ensure its service life, and can stably connect the large sheath 21, the small sheath 22 and the transmission shaft 10 together. In this embodiment, the cross section of the positioning nut 32 is a regular hexagon.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A protective sleeve for the transmission shaft of a bolt tightening machine, characterized in that, It includes a transmission shaft and a sheath body sleeved on the transmission shaft. The sheath body includes a large sheath and a small sheath. The transmission shaft includes a main body portion and a head with a size smaller than that of the main body portion. The lower end of the large sheath is provided with a first clamping groove adapted to the main body portion. The upper end of the large sheath is provided with an installation groove adapted to the small sheath, and the first clamping groove is communicated with the installation groove. The lower end of the small sheath is embedded in the installation groove, and the lower end of the small sheath is provided with a second clamping groove adapted to the head. The head penetrates through the first clamping groove and is embedded in the second clamping groove. The upper end of the small sheath is provided with a receiving groove adapted to a bolt to be tightened. The sheath body is also provided with positioning bolts respectively penetrating through the large sheath, the small sheath and the head.

2. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 1, wherein, The cross section of the first clamping groove is square, and the length of the first clamping groove is between 1 / 2 and 2 / 3 of the length of the main body portion.

3. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 1, wherein, A limiting ring is provided on the inner wall of the upper end of the first clamping groove. The inner hole of the limiting ring is communicated with the installation groove. The size of the inner hole of the limiting ring is the same as that of the head. The upper end of the main body portion abuts against the lower end of the limiting ring.

4. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 1, characterized in that, The cross section of the second clamping groove is square, and there is a gap between the upper end of the head and the inner bottom surface of the second clamping groove.

5. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 1, characterized in that The receiving groove is adapted to the nut or screw nut of the bolt to be tightened.

6. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 1, characterized in that, The positioning bolt includes a positioning screw rod and a positioning nut. The positioning screw rod respectively penetrates through the large sheath, the small sheath and the head, and a positioning nut is provided at one end of the positioning screw rod extending out of the side wall of the large sheath.

7. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 6, wherein The side wall of the large sheath is provided with a first receiving hole communicated with the installation groove. The positioning nut is embedded in the first receiving hole and is adapted to it. The side wall of the large sheath is also provided with a second receiving hole communicated with the installation groove. The second receiving hole corresponds to the first receiving hole. One end of the positioning screw rod away from the positioning nut is located in the second receiving hole. The thickness of the positioning nut is less than the depth of the second receiving hole, and the outer diameter of the positioning nut is less than the aperture of the second receiving hole.

8. The protective sleeve for the transmission shaft of the bolt tightening machine according to claim 7, characterized in that, The cross section of the positioning nut is a regular polygon structure.

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