Stable-transmission bit connecting structure

Abstract

The utility model provides a bit connecting structure with stable transmission. The bit connecting structure comprises a shell, a main shaft and a sensor body, through arrangement of the first limiting ring, the horizontal bearing assembly and the longitudinal bearing assembly, stable transmission between the main shaft and the sensor body can be realized. The inner ring of the sensor body is provided with the first fixing groove and the second fixing groove, the section diameter of the first fixing groove is smaller than or equal to the section diameter of the second fixing groove, and the design can enhance the connection stability of the sensor body and the main shaft. On the basis of ensuring that the sensor accurately detects the transmission of the main shaft, the arrangement of the horizontal bearing assembly and the longitudinal bearing assembly can well protect the main shaft from being impacted by external force in all directions; in the using process of the electric screwdriver, downward pressure exists during screw driving, the horizontal bearing assembly and the longitudinal bearing assembly avoid rotation abrasion between the sensor body and the main shaft, and friction and vibration in the transmission process are reduced through the structure.

Description

Technical Field

[0001] The utility model relates to the field of electric screwdriver bits, in particular to a screwdriver bit connection structure with stable transmission. Background Art

[0002] An electric screwdriver, also known as an electric screwdriver or electric screwdriver, is an electric tool used to tighten and loosen screws and nuts. It is an indispensable tool in the assembly industry.

[0003] During the use of the existing electric screwdriver, there is downward pressure when the screwdriver head twists the screw, and shaking and squeezing are easily generated between the main shaft and the internal components of the electric screwdriver. If used for a long time, the electric screwdriver will suffer great loss.

[0004] Therefore, it is necessary to provide a screwdriver bit connection structure with stable transmission to solve the above technical problems. Utility Model Content

[0005] The utility model provides a screwdriver bit connection structure with stable transmission, so as to solve the problems in the prior art that the screwdriver bit is easy to shake during use and the electric screwdriver has large loss.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a screwdriver bit connection structure with stable transmission, which includes:

[0007] The housing comprises a front cover located at the bottom end of the housing, wherein the front cover is provided with a through hole;

[0008] A spindle is located inside the housing, the bottom end of the spindle passes through the through hole and extends, the top end of the spindle is connected to the motor, and the bottom end of the spindle is connected to the bit; and

[0009] A sensor body connected to the housing, wherein the sensor body is sleeved on the outer ring of the main shaft;

[0010] Wherein, a first limiting ring is arranged on the outer side of the main shaft.

[0011] The inner ring of the sensor body is further provided with a first fixing groove and a second fixing groove, wherein the first fixing groove is located above the second fixing groove, and the cross-sectional diameter of the first fixing groove is smaller than or equal to the cross-sectional diameter of the second fixing groove;

[0012] The batch head connection structure also includes:

[0013] a horizontal bearing assembly, sleeved outside the main shaft and located above the first limiting ring, wherein the horizontal bearing assembly rotatably connects the top surface of the first limiting ring with the top wall of the first fixing groove; and

[0014] A longitudinal bearing assembly is sleeved outside the main shaft and is located below the first limiting ring. The longitudinal bearing assembly rotatably connects the outer surface of the main shaft with the side wall of the second fixing groove.

[0015] In the utility model, the longitudinal bearing assembly comprises:

[0016] An inner steel ring is sleeved on the main shaft, and a first receiving groove is arranged on the outer side of the inner steel ring;

[0017] An outer steel ring is arranged in the second fixing groove, a second receiving groove is arranged on the inner side of the outer steel ring, and the second receiving groove corresponds to the first receiving groove; and

[0018] A plurality of first steel balls are provided, and the plurality of first steel balls are rotatably provided between the inner steel ring and the outer steel ring. One side of the first steel ball is received in the first receiving groove, and the other side of the first steel ball is received in the second receiving groove.

[0019] In the present invention, the screwdriver bit connection structure further comprises a clasp, which is sleeved on the spindle and located below the longitudinal bearing assembly. The linear circlip is used to support and limit the position of the longitudinal bearing assembly, thereby improving the stability of the screwdriver bit connection structure.

[0020] In the utility model, the outer ring of the main shaft is provided with a first clamping groove, and the clamping ring is embedded in the first clamping groove.

[0021] In the utility model, the housing comprises:

[0022] A main shell body, a cylindrical structure, wherein an opening is provided at the bottom end of the main shell body; and

[0023] A front cover connected to the main housing, the front cover is used to close the opening, the front cover is provided with a through hole, and the main shaft passes through the through hole;

[0024] Wherein, the top surface of the front cover is connected to the bottom surface of the sensor body and the bottom surface of the outer steel ring.

[0025] In the utility model, a sealing groove is further arranged on the outer side of the sensor body, and a sealing ring is arranged in the sealing groove.

[0026] In the utility model, a second mounting groove is arranged at the bottom end of the main shaft, and the screwdriver bit is plugged and mounted in the second mounting groove.

[0027] In the utility model, a positioning hole is provided on the side of the spindle, and the positioning hole passes through the side wall of the spindle and is connected to the second mounting groove; the screwdriver bit connection structure also includes:

[0028] A sliding sleeve is slidably connected to the outer side of the main shaft, the sliding sleeve is correspondingly arranged on the outer side of the positioning hole, and a receiving groove is arranged on the inner side of the sliding sleeve;

[0029] A positioning bead is movably arranged in the positioning hole, and the cross-sectional width of the positioning bead is greater than the length of the positioning hole.

[0030] In the utility model, the screwdriver bit connection structure further includes:

[0031] A second limiting ring is arranged on the outside of the main shaft, and the second limiting ring is located below the longitudinal bearing assembly and below the positioning hole;

[0032] an elastic retaining spring, sleeved on the main shaft, the elastic retaining spring being located below the positioning hole, the sliding sleeve being located between the elastic retaining spring and the second limiting ring, and the elastic retaining spring being used to limit the position of the sliding sleeve; and

[0033] The elastic member is arranged between the second limiting ring and the top end of the sliding sleeve, and the elastic member elastically presses the sliding sleeve to contact with the second limiting ring.

[0034] In the utility model, a first positioning groove is further arranged on the outer side of the main shaft, and the elastic clamping spring is clamped with the first positioning groove.

[0035] Compared with the prior art, the utility model has the following beneficial effects: the stable transmission screwdriver bit connection structure of the utility model can realize stable transmission between the main shaft and the sensor body through the arrangement of the first limit ring, the horizontal bearing assembly and the longitudinal bearing assembly. The inner ring of the sensor body is provided with a first fixed groove and a second fixed groove, wherein the cross-sectional diameter of the first fixed groove is less than or equal to the cross-sectional diameter of the second fixed groove. This design can enhance the connection stability between the sensor body and the main shaft. On the basis of ensuring that the sensor accurately detects the transmission of the main shaft, the arrangement of the horizontal bearing assembly and the longitudinal bearing assembly can better protect the main shaft from the impact of external forces in all directions; during the use of the electric screwdriver, there is downward pressure when screwing in screws, and the horizontal bearing assembly and the longitudinal bearing assembly avoid rotational wear between the sensor body and the main shaft. This structure reduces friction and vibration during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0037] Figure 1 The figure is a schematic diagram of the electric screwdriver structure of a preferred embodiment of the utility model.

[0038] Figure 2 This is a longitudinal cross-sectional structural diagram of an electric screwdriver according to a preferred embodiment of the present utility model.

[0039] Figure 3 for Figure 2A magnified view of the local structure.

[0040] Figure 4 The cross-sectional view of the sleeve in the preferred embodiment of the utility model is shown in FIG. Figure 1 .

[0041] Figure 5 The cross-sectional view of the sleeve in the preferred embodiment of the utility model is shown in FIG. Figure 2 .

[0042] 191, horizontal bearing assembly; 1911, upper steel ring; 1912, lower steel ring; 1913, second steel ball; 192, longitudinal bearing assembly; 1921, inner steel ring; 1922, outer steel ring; 1923, first steel ball; 193, sleeve; 1931, storage groove; 194, positioning ball; 195, elastic member; 196, elastic retaining spring. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0044] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0045] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The following is a preferred embodiment of a stable transmission bit connection structure provided by the utility model that can solve the above technical problems.

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 ,in Figure 1 The figure is a schematic diagram of the electric screwdriver structure of a preferred embodiment of the utility model. Figure 2 This is a longitudinal cross-sectional structural diagram of an electric screwdriver according to a preferred embodiment of the present utility model. Figure 3 for Figure 2 A magnified view of the local structure.

[0049] In the figures, structurally similar elements are denoted by the same reference numerals.

[0050] The utility model provides a screwdriver bit connection structure with stable transmission, which includes a shell 11, a spindle 13 and a sensor body 15; wherein the shell 11 includes a front cover 112 located at the bottom end of the shell 11, and a through hole is provided on the front cover 112; the spindle 13 is located inside the shell 11, and the bottom end of the spindle 13 passes through the through hole and extends, the top end of the spindle 13 is connected to the motor 12, and the bottom end of the spindle 13 is connected to the screwdriver bit 14; the sensor body 15 is connected to the shell 11, and the sensor body 15 is sleeved on the outer ring of the spindle 13.

[0051] Among them, a first limiting ring 132 is arranged on the outer side of the main shaft 13, and a first fixing groove 1534 and a second fixing groove 1535 are also arranged on the inner ring of the sensor body 15. The first fixing groove 1534 is located above the second fixing groove 1535, and the cross-sectional diameter of the first fixing groove 1534 is less than or equal to the cross-sectional diameter of the second fixing groove 1535.

[0052] The bit connection structure also includes a horizontal bearing assembly 191 and a longitudinal bearing assembly 192; the horizontal bearing assembly 191 is sleeved outside the main shaft 13, and the horizontal bearing assembly 191 is located above the first limiting ring 132, and the horizontal bearing assembly 191 rotatably connects the top surface of the first limiting ring 132 with the top wall of the first fixed groove 1534; the longitudinal bearing assembly 192 is sleeved outside the main shaft 13, and the longitudinal bearing assembly 192 is located below the first limiting ring 132, and the longitudinal bearing assembly 192 rotatably connects the outer surface of the main shaft 13 with the side wall of the second fixed groove 1535.

[0053] The screwdriver bit connection structure can realize stable transmission between the spindle 13 and the sensor body 15 by setting the first limiting ring 132, the horizontal bearing assembly 191 and the longitudinal bearing assembly 192. The inner ring of the sensor body 15 is provided with a first fixing groove 1534 and a second fixing groove 1535, wherein the cross-sectional diameter of the first fixing groove 1534 is less than or equal to the cross-sectional diameter of the second fixing groove 1535. This design can enhance the connection stability between the sensor body 15 and the spindle 13. On the basis of ensuring that the sensor accurately detects the transmission of the spindle 13, the setting of the horizontal bearing assembly 191 and the longitudinal bearing assembly 192 can better protect the spindle 13 from external forces in all directions; during the use of the electric screwdriver, there is downward pressure when screwing, and the horizontal bearing assembly 191 and the longitudinal bearing assembly 192 avoid rotational wear between the sensor body 15 and the spindle 13. This structure reduces friction and vibration during the transmission process. The components of the screwdriver bit connection structure, such as the housing 11, the spindle 13 and the sensor body 15, are compact and simple, with reasonable design, and are easy to install and use.

[0054] Combination Figure 2 and Figure 3 The connection structure of the screwdriver bit in this embodiment is described in detail as follows:

[0055] The longitudinal bearing assembly 192 includes an inner steel ring 1921, an outer steel ring 1922 and a first steel ball 1923; the inner steel ring 1921 is sleeved on the main shaft 13, and a first receiving groove is arranged on the outer side of the inner steel ring 1921; the outer steel ring 1922 is arranged in the second fixed groove 1535, and a second receiving groove is arranged on the inner side of the outer steel ring 1922, and the second receiving groove corresponds to the first receiving groove; a plurality of first steel balls 1923 are arranged, and a plurality of first steel balls 1923 are rotatably arranged between the inner steel ring 1921 and the outer steel ring 1922, one side of the first steel ball 1923 is accommodated in the first receiving groove, and the other side of the first steel ball 1923 is accommodated in the second receiving groove, and the relative movement of the inner steel ring 1921 and the outer steel ring 1922 avoids the deviation of the main shaft 13 in the left and right directions.

[0056] Furthermore, the screwdriver bit connection structure in this embodiment further includes a snap ring 135, which is sleeved on the spindle 13 and is located below the longitudinal bearing assembly 192. The linear snap spring is used to support and limit the position of the longitudinal bearing assembly 192, thereby improving the stability of the screwdriver bit connection structure.

[0057] The outer ring of the main shaft 13 is provided with a first clamping groove, and the clamping ring 135 is embedded in the first clamping groove to prevent the clamping ring 135 from falling off the main shaft 13 .

[0058] The horizontal bearing assembly 191 in this embodiment includes an upper steel ring 1911, a lower steel ring 1912 and a second steel ball 1913; the upper steel ring 1911 and the lower steel ring 1912 are both mounted on the main shaft 13, and the top surface of the upper steel ring 1911 is in contact with the top surface of the first fixed groove 1534, and the bottom surface of the lower steel ring 1912 is connected to the top surface of the first limiting ring 132; and the second steel ball 1913 is rotatably arranged between the upper steel ring 1911 and the lower steel ring 1912, so that the horizontal bearing assembly 191 prevents the main shaft 13 from deviating in the up and down directions.

[0059] Combination Figure 1 and Figure 3 , the structure of the housing 11 in this embodiment is described:

[0060] The housing 11 in this embodiment includes a main housing 111 and a front cover 112; the main housing 111 is a cylindrical structure, and an opening is provided at the bottom end of the main housing 111; the front cover 112 is connected to the main housing 111, and the front cover 112 is used to close the opening. The front cover 112 is provided with a through hole, and the main shaft 13 passes through the through hole. Among them, the top surface of the front cover 112 is connected to the bottom surface of the sensor body 15 and the bottom surface of the outer steel ring 1922. The housing 11 can be detachably assembled through the main housing 111 and the front cover 112, which is convenient for the assembly of the electric screwdriver.

[0061] In addition, the bottom end of the outer steel ring 1922 in this embodiment contacts the top surface of the front cover 112, and the first limiting ring 131 and the front cover 112 limit and clamp the longitudinal bearing assembly 192, thereby improving the practicality of the longitudinal bearing assembly 192. The longitudinal bearing assembly 192 can also avoid wear between the sensor body 15 and the main shaft 13.

[0062] Furthermore, a sealing groove 1533 is provided on the outside of the sensor body 15 , and a sealing ring is provided in the sealing groove 1533 . The sealing ring seals and connects the sensor body 15 with the inner wall of the main shell 111 of the housing 11 , thereby improving the stability of the connection between the sensor body 15 and the housing 11 .

[0063] Combination Figure 3 , Figure 4 and Figure 5 , the connection between the screwdriver bit 14 and the spindle 13 in this embodiment is described as follows:

[0064] In this embodiment, a second mounting groove 133 is provided at the bottom end of the spindle 13, and the screwdriver bit 14 is plugged and installed in the second mounting groove 133. The screwdriver bit 14 is plugged and assembled with the spindle 13, which is convenient for replacing screwdriver bits 14 of different models.

[0065] Furthermore, a positioning hole 134 is provided on the side of the main shaft 13, and the positioning hole 134 passes through the side wall of the main shaft 13 and is connected to the second mounting groove 133; the screwdriver bit connection structure also includes a sleeve 193 and a positioning bead 194; the sleeve 193 is slidably connected to the outer side of the main shaft 13, the sleeve 193 is correspondingly arranged on the outer side of the positioning hole 134, and a storage groove 1931 is provided on the inner side of the sleeve 193; the positioning bead 194 is movably arranged in the positioning hole 134, and the cross-sectional width of the positioning bead 194 is greater than the length of the positioning hole 134.

[0066] The movement trajectory of the positioning bead 194 along the straight line in the extending direction of the positioning hole 134 includes a fixed position and a movable position, and the fixed position is outside the movable position; when the positioning bead 194 is at the fixed position, the positioning bead 194 is engaged with the second positioning groove 141, and the inner wall of the sliding sleeve 193 closes the outer side of the positioning hole 134; when the positioning bead 194 is at the movable position, the positioning bead 194 is engaged with the storage groove 1931, and the outer side of the screwdriver bit 14 closes the inner side of the positioning hole 134.

[0067] The screwdriver bit 14 is plugged into the second mounting groove 133, which is convenient for replacing screwdriver bits 14 of different models, thereby performing disassembly and assembly operations on different screws; the sliding sleeve 193 facilitates quick disassembly and assembly of the screwdriver bit 14 and the spindle 13, and improves the stability of the connection between the screwdriver bit 14 and the spindle 13.

[0068] The screwdriver bit connection structure in this embodiment also includes a second limiting ring, an elastic retaining ring 196 and an elastic member 195; the second limiting ring is arranged on the outside of the main shaft 13, the second limiting ring is located below the longitudinal bearing assembly 192, and below the positioning hole 134; the elastic retaining ring 196 is sleeved on the main shaft 13, the elastic retaining ring 196 is located below the positioning hole 134, the sliding sleeve 193 is located between the elastic retaining ring 196 and the second limiting ring, and the elastic retaining ring 196 is used to limit the position of the sliding sleeve 193; the elastic member 195 is arranged between the second limiting ring and the top of the sliding sleeve 193, and the elastic member 195 elastically squeezes the sliding sleeve 193 to contact the second limiting ring. Preferably, the second limiting ring in this embodiment is a retaining ring 135, and can also be an annular structure integrated with the main shaft 13.

[0069] The elastic member 195 elastically squeezes the sliding sleeve 193 to contact with the second limiting ring, so that the positioning bead 194 remains in a fixed position, thereby preventing the sliding sleeve 193 from loosening due to vibration of the electric screwdriver during use.

[0070] Furthermore, a first positioning groove 136 is provided on the outer side of the main shaft 13 , and the elastic retaining spring 196 is engaged with the first positioning groove 136 , thereby improving the stability of the connection between the elastic retaining spring 196 and the main shaft 13 and preventing the elastic retaining spring 196 from falling off.

[0071] The working principle of this utility model:

[0072] 1. The driving shaft 1211 of the motor 12 is plugged into the first mounting groove 131 at the top of the spindle 13. The motor 12 and the spindle 13 are connected and driven inside the sensor body 15. Two bearings are provided to connect the spindle 13 with the inner ring of the sensor body 15, which improves the stability of the spindle 13 during use and avoids the deviation caused by the up-down and left-right shaking of the spindle 13. The structure is highly practical.

[0073] 2. When the user needs to install the bit 14: first, push the sleeve 193 upwards so that the storage groove 1931 inside the sleeve 193 corresponds to the positioning hole 134; second, take out the bit 14 and plug it into the second installation groove 133. During the plugging process, the side wall of the bit 14 will squeeze the positioning bead 194 and engage with the storage groove 1931; then, after the bit 14 is plugged into place, the second positioning groove 141 corresponds to the positioning hole 134, release the sleeve 193, and the elastic member 195 elastically drives the sleeve 193 to reset. The sleeve 193 squeezes the positioning bead 194 to move along the extension direction of the positioning hole 134, so that the positioning bead 194 engages with the second positioning groove 141. Finally, the elastic member 195 elastically squeezes the sleeve 193 to fit with the second limiting ring, and the positioning bead 194 engages with the second positioning groove 141, and the installation of the bit 14 is completed.

[0074] When the user disassembles or replaces the bit 14, the above steps can be repeated, which will not be described in detail here.

[0075] This completes the working process of the stable transmission bit connection structure of the preferred embodiment.

[0076] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A screwdriver bit connection structure with stable transmission, characterized in that: include: The housing comprises a front cover located at the bottom end of the housing, wherein the front cover is provided with a through hole; A spindle is located inside the housing, the bottom end of the spindle passes through the through hole and extends, the top end of the spindle is connected to the motor, and the bottom end of the spindle is connected to the bit; and A sensor body connected to the housing, wherein the sensor body is sleeved on the outer ring of the main shaft; Wherein, a first limiting ring is arranged on the outer side of the main shaft. The inner ring of the sensor body is further provided with a first fixing groove and a second fixing groove, wherein the first fixing groove is located above the second fixing groove, and the cross-sectional diameter of the first fixing groove is smaller than or equal to the cross-sectional diameter of the second fixing groove; The batch head connection structure also includes: a horizontal bearing assembly, sleeved outside the main shaft and located above the first limiting ring, wherein the horizontal bearing assembly rotatably connects the top surface of the first limiting ring with the top wall of the first fixing groove; and A longitudinal bearing assembly is sleeved outside the main shaft and is located below the first limiting ring. The longitudinal bearing assembly rotatably connects the outer surface of the main shaft with the side wall of the second fixing groove.

2. The stable transmission bit connection structure according to claim 1, characterized in that: The longitudinal bearing assembly comprises: An inner steel ring is sleeved on the main shaft, and a first receiving groove is arranged on the outer side of the inner steel ring; An outer steel ring is arranged in the second fixing groove, a second receiving groove is arranged on the inner side of the outer steel ring, and the second receiving groove corresponds to the first receiving groove; and A number of first steel balls are provided, and a plurality of first steel balls are rotatably provided between the inner steel ring and the outer steel ring. One side of the first steel ball is received in the first receiving groove, and the other side of the first steel ball is received in the second receiving groove.

3. The stable transmission bit connection structure according to claim 2, characterized in that: The bit connection structure also includes a snap ring, which is sleeved on the main shaft and located below the longitudinal bearing assembly.

4. The stable transmission bit connection structure according to claim 3, characterized in that: The outer ring of the main shaft is provided with a first clamping groove, and the clamping ring is embedded in the first clamping groove.

5. The stable transmission bit connection structure according to claim 2, characterized in that: The housing comprises: A main shell body, a cylindrical structure, wherein an opening is provided at the bottom end of the main shell body; and A front cover connected to the main housing, the front cover is used to close the opening, the front cover is provided with a through hole, and the main shaft passes through the through hole; Wherein, the top surface of the front cover is connected to the bottom surface of the sensor body and the bottom surface of the outer steel ring.

6. The stable transmission bit connection structure according to claim 1, characterized in that: A sealing groove is also arranged on the outside of the sensor body, and a sealing ring is arranged in the sealing groove.

7. The stable transmission bit connection structure according to claim 1, characterized in that: The bottom end of the spindle is provided with a second mounting groove, and the screwdriver bit is plugged and mounted in the second mounting groove.

8. The stable transmission bit connection structure according to claim 7, characterized in that: The spindle side is provided with a positioning hole, the positioning hole passes through the spindle side wall and is connected to the second mounting groove; the screwdriver bit connection structure also includes: A sliding sleeve is slidably connected to the outer side of the main shaft, the sliding sleeve is correspondingly arranged on the outer side of the positioning hole, and a receiving groove is arranged on the inner side of the sliding sleeve; A positioning bead is movably arranged in the positioning hole, and the cross-sectional width of the positioning bead is greater than the length of the positioning hole.

9. The stable transmission bit connection structure according to claim 8, characterized in that: The batch head connection structure also includes: A second limiting ring is arranged on the outside of the main shaft, and the second limiting ring is located below the longitudinal bearing assembly and below the positioning hole; an elastic retaining spring, sleeved on the main shaft, the elastic retaining spring being located below the positioning hole, the sliding sleeve being located between the elastic retaining spring and the second limiting ring, and the elastic retaining spring being used to limit the position of the sliding sleeve; and The elastic member is arranged between the second limiting ring and the top end of the sliding sleeve, and the elastic member elastically presses the sliding sleeve to contact with the second limiting ring.

10. The stable transmission bit connection structure according to claim 9, characterized in that: A first positioning groove is also arranged on the outer side of the main shaft, and the elastic retaining spring is engaged with the first positioning groove.

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