A rotation over-force protection device and bottle cap screwing device

Abstract

The present invention relates to the technical field of bottle cap screwing, and discloses a rotational over-force protection device and a bottle cap screwing device, comprising a rotational drive device, a first connecting head and a second connecting head, wherein the rotational drive device drives the first connecting head to rotate, the first connecting head comprises a connecting sleeve, the second connecting head comprises a limit plate which cooperates with an outer pattern on a cover body to realize rotational limit, and a connecting rod arranged on the limit plate, wherein a plurality of abutting end faces are circumferentially arranged on the connecting rod, the connecting rod is installed in the connecting sleeve, a first elastic pin is arranged on the connecting sleeve, and an end of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end face; a rotational over-force protection device and a bottle cap screwing device provided by the present invention can realize automatic tightening of the cover body, and can realize over-force protection, and ensure uniform tightening degree of the cover body, and the structural design is simple, the cost is low, the operation is convenient, and it is easier to control, and it can be applied to various scenes where the cover body needs to be screwed, and the application scenes are wide.

Description

Technical Field

[0001] The invention relates to the technical field of bottle cap screwing, and in particular to a rotation over-force protection device and a bottle cap screwing device. Background Art

[0002] Microwave digestion technology uses the penetration and activation of microwaves to heat reagents and samples in a sealed container, which can increase the pressure in the sample preparation container and the reaction temperature, thereby greatly improving the reaction rate and shortening the sample preparation time. Microwave digestion tanks are widely used in scientific research experiments in the fields of new materials, energy, and environmental engineering. They are commonly used small reactors for scientific research in university teaching, scientific research units, and chemical laboratories.

[0003] Before placing the microwave digestion vessel into the microwave digestion instrument, the cover of the microwave digestion vessel needs to be tightened. Currently, the manual tightening of the cover is time-consuming and laborious, and the degree of tightening of the cover is difficult to control and is not uniform.

[0004] The traditional way of twisting the bottle cap requires the bottle body and the rotating mechanism to be disengaged to avoid excessive rotation of the bottle cap. From the perspective of structural design, the equipment design is complex and the cost is high. From the perspective of human operation, the operator moves the bottle body by sensing the gripping force when holding the bottle body. Since different people have different gripping forces, and even if the same person operates, the gripping force may be different before and after the operation due to the length of time. Therefore, when the rotating mechanism continues to twist the cap, the gripping force is different and it is impossible to achieve a uniform tightening degree of the cap.

[0005] Since the digestion tank usually needs to withstand high temperature and pressure, the tightening degree of the cover is particularly important in terms of pretreatment and safety. In the prior art, the tightening degree of the cover cannot be unified. Usually, if the cover is not completely tightened, exhaust gas leakage will occur. Moreover, since the microwave digestion tank needs to withstand high temperature and high pressure, it is difficult to ensure the safety of the microwave digestion tank if the cover is not tightened to a suitable degree. In addition, the tank body may be damaged due to excessive rotational torque. Therefore, it is urgently necessary to design a rotation over-force protection device and a bottle cap screwing device that can effectively control the tightening degree of the cover. Summary of the invention

[0006] In response to the problems existing in the above-mentioned prior art, the present invention provides a rotational over-force protection device and a bottle cap screwing device, which can realize automatic tightening of the cap body and can realize over-force protection, ensure the uniform tightening degree of the cap body, and have simple structural design, low cost, convenient operation and easier control. It can be applied to various scenarios where the cap body needs to be screwed, and has a wide range of application scenarios.

[0007] The technical solution adopted by the present invention is:

[0008] A rotational over-force protection device comprises a rotational drive device, a first connecting head and a second connecting head, wherein the rotational drive device drives the first connecting head to rotate, the first connecting head comprises a connecting sleeve, the second connecting head comprises a limit plate which cooperates with an external pattern on a cover body to realize rotation limit, and a connecting rod arranged on the limit plate, a plurality of abutment end faces are circumferentially arranged on the connecting rod, the connecting rod is installed in the connecting sleeve, a first elastic pin is arranged on the connecting sleeve, a plurality of the first elastic pins are evenly arranged along the circumference of the connecting sleeve, and the end of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutment end face.

[0009] In the technical solution, since the rotary drive device drives the first connecting head to rotate, a plurality of abutting end faces are circumferentially provided on the connecting rod, and the end of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end faces, that is, the rotary drive device drives the first connecting head to rotate. At the same time, through the arrangement of the plurality of first elastic pins in the connecting sleeve, the plurality of abutting end faces on the connecting rod can be tightened. That is, during the rotation of the connecting sleeve, the first elastic pin can clamp the connecting rod, thereby realizing the rotation driving of the second connecting head, and the limiting plate of the second connecting head realizes the effective docking of the two by cooperating with the outer texture on the cover body. When the position of the bottle body remains stationary, the operator can hold the bottle body to keep the bottle body stationary, and the second connecting head drives the cover body to rotate relative to the bottle body to realize the screwing operation, and then continues to screw. When the rotation force exceeds the clamping bearing capacity of the first elastic pin, the second connecting head automatically stops rotating with the first connecting head, thereby preventing the cover body from continuing to rotate, thereby achieving the purpose of over-force protection.

[0010] At the same time, since there are multiple abutment end faces circumferentially arranged on the connecting rod, that is, there are edges between adjacent abutment end faces, it is preferably designed as an arc edge, that is, this part of the rod portion on the connecting rod with the abutment end face is a prism structure with multiple edges. Then, when the rotational force exceeds the clamping bearing capacity of the first elastic pin, since the cover body and the bottle body are already in a tightened state at this time, the first elastic pin will automatically pop open during the continued rotation of the first connecting head, and the second connecting head will stop rotating with the first connecting head, and the end of the first elastic pin will move along the outer periphery of the prism structure. In order to further reduce the friction resistance, a steel ball is provided at the end of the first elastic pin, that is, when the screwing is excessive, the steel ball rolls with the outer periphery of the prism structure. At this time, due to the design of the prism structure, not only can the clamping effect of the first elastic pin on the connecting rod be guaranteed during the screwing process, but also when the screwing is excessive, the ball can roll along the outer periphery of the prism to produce a vibration effect, which also has a certain prompt effect on the cover being screwed into place, and is convenient to use and operate.

[0011] The technical solution only requires the matching relationship of the prism structure between the first elastic pin and the connecting rod from a structural point of view, so as to achieve the over-force protection effect, and has a simple structure and low cost.

[0012] During operation, you only need to hold the bottle body. Under over-force conditions, the first elastic pin will automatically pop open, which not only provides over-force protection but also serves as a reminder, making operation convenient.

[0013] In summary, the technical solution can realize automatic tightening of the cover body, and can realize over-force protection, ensuring the uniform tightening degree of the cover body, and has a simple structural design, low cost, convenient operation, and easier control. It can be applied to various scenarios where the cover body needs to be screwed, and has a wide range of application scenarios.

[0014] Furthermore, in order to match different second connectors with different cover bodies, the first connector is detachably connected to the second connector.

[0015] Furthermore, in order to ensure effective connection between the connecting rod and the connecting sleeve and facilitate replacement of the second connector, a limiting structure is provided between the connecting rod and the connecting sleeve to limit the connecting rod from coming out of the connecting sleeve.

[0016] Furthermore, in order to ensure an effective connection between the connecting rod and the connecting sleeve and to facilitate the replacement of the second connecting head, the limiting structure includes an annular groove circumferentially arranged on the connecting rod and a plurality of second elastic pins circumferentially arranged on the connecting sleeve, the end of the first elastic pin extending into the connecting sleeve abuts against the annular groove, the annular groove is located below the abutting end surface, and the second elastic pin is located below the first elastic pin.

[0017] The abutment between the second elastic pin and the annular groove can prevent the second connecting head from escaping from the connecting sleeve, thereby realizing effective connection between the two. In addition, when the second connecting head needs to be replaced, the second connecting head can be directly taken out by external force, and then replaced with another second connecting head. The connecting rod can be inserted into the connecting sleeve to realize the clamping connection between the second elastic pin and the annular groove. The replacement operation is convenient and the use is more flexible.

[0018] Furthermore, in order to better realize the driving of the first connector, the rotation driving device is a motor, the first connector includes a connecting column, the connecting column is coaxially fixed to the upper end of the connecting sleeve, and the output shaft of the motor is fixedly connected to the connecting column.

[0019] Furthermore, the connecting rod is coaxially mounted on the limiting plate by means of screws.

[0020] Furthermore, in order to better achieve the snap-fitting with the cover body, the limiting plate has a matching cavity, and the inner wall of the matching cavity is circumferentially provided with a plurality of vertical bar protrusions that match with a plurality of vertical bar grooves circumferentially provided on the cover body.

[0021] A bottle cap tightening device comprises the above-mentioned rotation over-force protection device.

[0022] Furthermore, in order to better realize the installation of the rotational over-force protection device, it includes a shell and a frame arranged in the shell, the rotational over-force protection device is installed on the frame, and the limit plate is located outside the shell.

[0023] Furthermore, the shell includes a first shell portion and a second shell portion, the second shell portion is integrally formed on one side of the upper end of the first shell portion, the lower end of the second shell portion is provided with a first opening, the lower end of the second shell portion is provided with a mounting plate, a cover body is downwardly extended from the mounting plate, the cover body is coaxially arranged with the first opening, a mounting frame for mounting the motor is provided on the frame body, a first mounting sleeve is provided at the lower end of the mounting frame, a second mounting sleeve is provided in the cover body, a bearing sleeve is provided between the first mounting sleeve and the second mounting sleeve, a bearing is provided between the connecting column of the first connecting head and the bearing sleeve, a second opening is provided at the lower end of the cover body, the lower end of the second mounting sleeve extends out of the second opening, and the connecting sleeve is located in the second mounting sleeve.

[0024] The beneficial effects of the present invention are as follows: in the technical scheme, since the rotary drive device drives the first connecting head to rotate, a plurality of abutting end faces are circumferentially arranged on the connecting rod, and the end of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end faces, that is, the rotary drive device drives the first connecting head to rotate, and at the same time, through the arrangement of the plurality of first elastic pins in the connecting sleeve, the plurality of abutting end faces on the connecting rod can be abutted, that is, in the process of rotation of the connecting sleeve, since the first elastic pin can clamp the connecting rod, the rotation driving of the second connecting head is realized, and the limiting plate of the second connecting head realizes effective docking of the two by cooperating with the outer texture on the cover body. When the position of the bottle body remains stationary, the operator can hold the bottle body to keep the bottle body stationary, and the second connecting head drives the cover body to rotate relative to the bottle body to realize the screwing operation, and then the screwing is continued. When the rotation force exceeds the clamping bearing capacity of the first elastic pin, the second connecting head automatically stops rotating with the first connecting head, thereby preventing the cover body from continuing to rotate, thereby achieving the purpose of over-force protection.

[0025] At the same time, since there are multiple abutment end faces circumferentially arranged on the connecting rod, that is, there are edges between adjacent abutment end faces, it is preferably designed as an arc edge, that is, this part of the rod portion on the connecting rod with the abutment end face is a prism structure with multiple edges. Then, when the rotational force exceeds the clamping bearing capacity of the first elastic pin, since the cover body and the bottle body are already in a tightened state at this time, the first elastic pin will automatically pop open during the continued rotation of the first connecting head, and the second connecting head will stop rotating with the first connecting head, and the end of the first elastic pin will move along the outer periphery of the prism structure. In order to further reduce the friction resistance, a steel ball is provided at the end of the first elastic pin, that is, when the screwing is excessive, the steel ball rolls with the outer periphery of the prism structure. At this time, due to the design of the prism structure, not only can the clamping effect of the first elastic pin on the connecting rod be guaranteed during the screwing process, but also when the screwing is excessive, the ball can roll along the outer periphery of the prism to produce a vibration effect, which also has a certain prompt effect on the cover being screwed into place, and is convenient to use and operate.

[0026] The technical solution only requires the matching relationship of the prism structure between the first elastic pin and the connecting rod from a structural point of view, so as to achieve the over-force protection effect, and has a simple structure and low cost.

[0027] During operation, you only need to hold the bottle body. Under over-force conditions, the first elastic pin will automatically pop open, which not only provides over-force protection but also serves as a reminder, making operation convenient.

[0028] In summary, the technical solution can realize automatic tightening of the cover body, and can realize over-force protection, ensuring the uniform tightening degree of the cover body, and has a simple structural design, low cost, convenient operation, and easier control. It can be applied to various scenarios where the cover body needs to be screwed, and has a wide range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0031] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0032] Figure 4 It is a schematic diagram of the structure of some components in the present invention;

[0033] Figure 5 is a schematic structural diagram of the second connector in the present invention from a first viewing angle;

[0034] Figure 6 is a schematic structural diagram of the first connector in the present invention;

[0035] Figure 7 is a structural schematic diagram of the second connector in the present invention from a second viewing angle;

[0036] Figure 8 It is a partial cross-sectional structural schematic diagram of the present invention.

[0037] In the figure: connecting sleeve 1; limiting plate 2; connecting rod 3; abutting end face 4; first elastic pin 5; annular groove 6; second elastic pin 7; motor 8; connecting column 9; matching cavity 10; vertical bar protrusion 11; outer shell 12; frame 13; first shell part 14; second shell part 15; operating space 16; first opening 17; mounting plate 18; cover body 19; mounting frame 20; first mounting sleeve 21; second mounting sleeve 22; bearing sleeve 23; bearing 24; second opening 25; cover body 26; bottle body 27; operating button 28; first connector 29; second connector 30. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] Embodiment 1:

[0043] like Figure 1-Figure 8As shown, this embodiment provides a rotational over-force protection device, including a rotational drive device, a first connecting head 29 and a second connecting head 30. The rotational drive device drives the first connecting head 29 to rotate. The first connecting head 29 includes a connecting sleeve 1. The second connecting head 30 includes a limit plate 2 that cooperates with the external texture on the cover body 26 to achieve rotation limit and a connecting rod 3 arranged on the limit plate 2. A plurality of abutment end faces 4 are circumferentially arranged on the connecting rod 3. The connecting rod 3 is installed in the connecting sleeve 1. A first elastic pin 5 is provided on the connecting sleeve 1. A plurality of first elastic pins 5 are evenly arranged along the circumference of the connecting sleeve 1. The end of the first elastic pin 5 extending into the connecting sleeve 1 abuts against the corresponding abutment end face 4.

[0044] In the technical solution, since the rotary drive device drives the first connecting head 29 to rotate, a plurality of abutting end faces 4 are provided on the circumferential direction of the connecting rod 3, and the end of the first elastic pin 5 extending into the connecting sleeve 1 abuts against the corresponding abutting end face 4, that is, the rotary drive device drives the first connecting head 29 to rotate, and at the same time, through the arrangement of the plurality of first elastic pins 5 in the connecting sleeve 1, the plurality of abutting end faces 4 on the connecting rod 3 can be tightened, that is, during the rotation of the connecting sleeve 1, the first elastic pin 5 can clamp the connecting rod 3, thereby achieving the second connecting head 30 is driven by rotation, and the limiting disk 2 of the second connecting head 30 realizes effective docking of the two by cooperating with the outer texture on the cover body 26. When the position of the bottle body 27 remains stationary, the operator can hold the bottle body 27 to keep it stationary, and the second connecting head 30 drives the cover body 26 to rotate relative to the bottle body 27 to realize the screwing operation, and then the screwing is continued. When the rotational force exceeds the clamping bearing capacity of the first elastic pin 5, the second connecting head 30 automatically stops rotating with the first connecting head 29, thereby preventing the cover body 26 from continuing to rotate, thereby achieving the purpose of over-force protection.

[0045] At the same time, since the connecting rod 3 is provided with a plurality of abutting end faces 4 in the circumferential direction, that is, there are edges between adjacent abutting end faces 4, preferably, the design is an arc edge, that is, the portion of the connecting rod 3 provided with the abutting end faces 4 is a prism structure with multiple edges, when the rotation force exceeds the clamping bearing capacity of the first elastic pin 5, since the cover body 26 and the bottle body 27 are already in a tightened state at this time, the first elastic pin 5 will automatically pop open during the continued rotation of the first connector 29, and the second connector 30 will stop following the first connector 2 9 is rotated, and the end of the first elastic pin 5 moves along the periphery of the prism structure. In order to further reduce the friction resistance, a steel ball is provided at the end of the first elastic pin 5, that is, when the screwing is excessive, the steel ball rolls with the periphery of the prism structure. At this time, due to the design of the prism structure, not only can the clamping effect of the first elastic pin 5 on the connecting rod 3 be guaranteed during the screwing process, but also when the screwing is excessive, the ball can roll along the periphery of the prism to produce a vibration effect, which also has a certain prompt effect on the cover body 26 being screwed into place, and the use and operation are convenient.

[0046] The technical solution only requires the matching relationship of the prismatic structure between the first elastic pin 5 and the connecting rod 3 from the structural point of view, so as to achieve the over-force protection effect, and has a simple structure and low cost.

[0047] During operation, it is only necessary to hold the bottle body 27. Under over-force conditions, the first elastic pin 5 will automatically pop open, which not only provides over-force protection but also serves as a reminder, and is easy to operate.

[0048] In summary, the technical solution can realize the automatic tightening of the cover body 26, and can realize over-force protection, ensuring the uniform tightening degree of the cover body 26, and has a simple structural design, low cost, convenient operation, and easier control. It can be applied to various scenarios where the cover body 26 needs to be screwed, and has a wide range of application scenarios.

[0049] Embodiment 2:

[0050] This embodiment is optimized based on the above-mentioned embodiment 1.

[0051] In order to match different second connectors 30 according to different covers 26 , the first connector 29 is detachably connected to the second connector 30 .

[0052] Embodiment 3:

[0053] This embodiment is optimized based on the above-mentioned embodiment 2.

[0054] In order to ensure effective connection between the connecting rod 3 and the connecting sleeve 1 and facilitate replacement of the second connector 30 , a limiting structure is provided between the connecting rod 3 and the connecting sleeve 1 to limit the connecting rod 3 from escaping from the connecting sleeve 1 .

[0055] Embodiment 4:

[0056] This embodiment is optimized based on the above-mentioned embodiment 3.

[0057] In order to ensure the effective connection between the connecting rod 3 and the connecting sleeve 1 and facilitate the replacement of the second connecting head 30, the limiting structure includes an annular groove 6 circumferentially arranged on the connecting rod 3 and a plurality of second elastic pins 7 circumferentially arranged on the connecting sleeve 1. The end of the first elastic pin 5 extending into the connecting sleeve 1 abuts against the annular groove 6, the annular groove 6 is located below the abutting end face 4, and the second elastic pin 7 is located below the first elastic pin 5.

[0058] The abutment between the second elastic pin 7 and the annular groove 6 can prevent the second connecting head 30 from escaping from the connecting sleeve 1, thereby realizing an effective connection between the two. In addition, when the second connecting head 30 needs to be replaced, the second connecting head 30 can be directly taken out by external force, and then replaced with another second connecting head 30. The connecting rod 3 is inserted into the connecting sleeve 1 to realize the clamping connection between the second elastic pin 7 and the annular groove 6. The replacement operation is convenient and the use is more flexible.

[0059] Embodiment 5:

[0060] This embodiment is optimized based on the above-mentioned embodiment 4.

[0061] In order to better drive the first connector 29 , the rotation drive device is a motor 8 , and the first connector 29 includes a connecting column 9 , which is coaxially fixed to the upper end of the connecting sleeve 1 , and the output shaft of the motor 8 is fixedly connected to the connecting column 9 .

[0062] Embodiment 6:

[0063] This embodiment is optimized based on the above-mentioned embodiment 5.

[0064] The connecting rod 3 is coaxially mounted on the limiting plate 2 by means of screws.

[0065] Embodiment 7:

[0066] This embodiment is optimized based on the above-mentioned embodiment 6.

[0067] In order to better achieve the snap-fitting with the cover body 26 , the limiting plate 2 has a matching cavity 10 , and the inner wall of the matching cavity 10 is circumferentially provided with a plurality of vertical bar protrusions 11 that match with a plurality of vertical bar grooves circumferentially provided on the cover body 26 .

[0068] Embodiment 8:

[0069] like Figure 1-Figure 8 As shown, a bottle cap tightening device includes a rotation over-force protection device.

[0070] Embodiment 9:

[0071] This embodiment is optimized based on the above-mentioned embodiment 8.

[0072] In order to better realize the installation of the rotational over-force protection device, it includes a shell 12 and a frame 13 arranged in the shell 12 . The rotational over-force protection device is installed on the frame 13 , and the limit plate 2 is located outside the shell 12 .

[0073] Embodiment 10:

[0074] This embodiment is optimized based on the above-mentioned embodiment 9.

[0075] The housing 12 includes a first housing portion 14 and a second housing portion 15. The second housing portion 15 is integrally formed on one side of the upper end of the first housing portion 14. An operating space 16 is provided below the second housing portion 15 to facilitate docking of the cover 26 of the bottle body 27 into the second connector 30. A first opening 17 is provided at the lower end of the second housing portion 15. A mounting plate 18 is provided at the lower end of the second housing portion 15. A cover 19 is extended downwardly from the mounting plate 18. The cover 19 is coaxially arranged with the first opening 17. A mounting frame 20 for mounting the motor 8 is provided on the frame 13. A first mounting sleeve 21 is provided at the lower end of the mounting frame 20. A second mounting sleeve 22 is provided in the cover 19. A bearing sleeve 23 is provided between the first mounting sleeve 21 and the second mounting sleeve 22. A bearing 24 is provided between the connecting column 9 of the first connector 29 and the bearing sleeve 23. A second opening 25 is provided at the lower end of the cover 19. The lower end of the second mounting sleeve 22 extends out of the second opening 25. The connecting sleeve 1 is located in the second mounting sleeve 22.

[0076] It should be noted that, in the present technical solution, an operation button 28 is provided on the shell, which can realize one-button start, and the operation is convenient. Different first elastic pins 5 can be replaced according to different cap screwing requirements. The torque is adjustable and can be fixed. The number of the first elastic pins 5 and the second elastic pins 7 can be set as needed. The present device can realize automatic over-force protection. Since the second connector 30 can be replaced, it can be matched with different cover bodies 26 produced by different manufacturers. When applied to microwave digestion tanks, it can also match microwave digestion tanks of different models, which provides a higher possibility for sample pre-treatment and improves work efficiency.

[0077] It should be noted that the device can be used not only to screw the lid of a microwave digestion tank, but also to other application scenarios where a bottle needs to have a lid screwed on.

[0078] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A rotational over-force protection device, characterized in that: The invention comprises a rotation driving device, a first connecting head and a second connecting head, wherein the rotation driving device drives the first connecting head to rotate, the first connecting head comprises a connecting sleeve, the second connecting head comprises a limiting plate which cooperates with the outer pattern on the cover body to realize the rotation limit, and a connecting rod arranged on the limiting plate, wherein the connecting rod is provided with a plurality of abutting end faces in a circumferential direction, the connecting rod is installed in the connecting sleeve, the connecting sleeve is provided with a first elastic pin, a plurality of the first elastic pins are evenly arranged along the circumferential direction of the connecting sleeve, and the end of the first elastic pin extending into the connecting sleeve abuts against the corresponding abutting end face; The first connector is detachably connected to the second connector; A limiting structure is provided between the connecting rod and the connecting sleeve to limit the connecting rod from coming out of the connecting sleeve; The limiting structure includes an annular groove circumferentially arranged on the connecting rod and a plurality of second elastic pins circumferentially arranged on the connecting sleeve. The end of the first elastic pin extending into the connecting sleeve abuts against the annular groove. The annular groove is located below the abutting end surface. The second elastic pin is located below the first elastic pin.

2. A rotation over-force protection device according to claim 1, characterized in that: The rotary drive device is a motor, the first connector includes a connecting column, the connecting column is coaxially fixed to the upper end of the connecting sleeve, and the output shaft of the motor is fixedly connected to the connecting column.

3. A rotation over-force protection device according to claim 1, characterized in that: The connecting rod is coaxially mounted on the limiting plate through screws.

4. A rotation over-force protection device according to claim 1, characterized in that: The limiting plate has a matching cavity, and the inner wall of the matching cavity is circumferentially provided with a plurality of vertical bar protrusions that match with a plurality of vertical bar grooves circumferentially provided on the cover body.

5. A bottle cap tightening device, characterized in that: It comprises a rotation over-force protection device as claimed in any one of claims 1 to 4.

6. A bottle cap tightening device according to claim 5, characterized in that: It comprises a shell and a frame body arranged in the shell, the rotation over-force protection device is installed on the frame body, and the limit plate is located outside the shell.

7. A bottle cap tightening device according to claim 6, characterized in that: The shell includes a first shell portion and a second shell portion, the second shell portion is integrally formed on one side of the upper end of the first shell portion, the lower end of the second shell portion is provided with a first opening, the lower end of the second shell portion is provided with a mounting plate, a cover body is extended downwardly from the mounting plate, the cover body is coaxially arranged with the first opening, a mounting frame for mounting the motor is provided on the frame body, a first mounting sleeve is provided at the lower end of the mounting frame, a second mounting sleeve is provided in the cover body, a bearing sleeve is provided between the first mounting sleeve and the second mounting sleeve, a bearing is provided between the connecting column of the first connecting head and the bearing sleeve, a second opening is provided at the lower end of the cover body, the lower end of the second mounting sleeve extends out of the second opening, and the connecting sleeve is located in the second mounting sleeve.

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