Rotary driving device and film flushing box

Abstract

The utility model belongs to the technical field of film flushing, and particularly relates to a rotary driving device and a film flushing box, the rotary driving device comprises a knob assembly and a rocking handle, the knob assembly comprises a connecting shaft and a handheld rotating part connected to one end of the connecting shaft, and the end, away from the handheld rotating part, of the connecting shaft is used for being connected with a film receiving device; the winding device is used for winding a film; one end of the rocking handle is movably connected to the handheld rotating part, so that the other end of the rocking handle can rotate to the outer side of the handheld rotating part in the circumferential direction to enable the rotation driving device to be in an unfolded state, or the rocking handle rotates relative to the handheld rotating part to be folded on the handheld rotating part to enable the rotation driving device to be in a folded state. In the folded state, a user can rotate the handheld rotating part to roll the film onto the winding device, and in the unfolded state, the user can rotate the rocking handle to complete film washing, and the knob assembly and the rocking handle do not need to be frequently disassembled and assembled.

Description

Technical Field

[0001] The present application belongs to the technical field of film developing, and in particular relates to a rotary drive device and a film developing box. Background Art

[0002] The film developing box has the advantages of low developing cost, easy use, and the ability to prevent the leakage of private photo content, and is suitable for photography enthusiasts to develop their own photos.

[0003] Existing film developing boxes consist of a developing box, a film core, a knob, and a crank. To develop film, the film is loaded onto the core, the core is rotated using the knob to wind the film, and then chemical solution is introduced into the developing box. The crank then rotates the core at a predetermined speed to ensure that the chemical solution and film come into full and even contact, achieving optimal developing results.

[0004] When installing the crank to rotate the film reel, the knob must be removed first. After the film is developed, the knob must be reinstalled for the next film development. Removing and installing the knob and crank is not only cumbersome, but also easy to lose the removed knob and crank. Utility Model Content

[0005] The purpose of the present application is to provide a rotary drive device and a film developing box to solve the problem that the knob and the crank need to be frequently disassembled and assembled.

[0006] In order to achieve the above objectives, the present application provides a rotation drive device, comprising:

[0007] The knob assembly includes a connecting shaft and a handheld rotating portion connected to one end of the connecting shaft, wherein the end of the connecting shaft facing away from the handheld rotating portion is used to connect to a winding device, and the winding device is used to wind the film;

[0008] a crank, one end of which is movably connected to the handheld rotating portion, so that the other end of the crank can be rotated to the outside of the handheld rotating portion in a circumferential direction to put the rotary drive device into an extended state, or the crank can be rotated relative to the handheld rotating portion to be folded onto the handheld rotating portion to put the rotary drive device into a collapsed state;

[0009] When the rotary drive device is in a folded state, the user can rotate the handheld rotating part to realize the rotation of the winding device; when the rotary drive device is in an unfolded state, the user can hold the crank to drive the handheld rotating part to rotate and realize the rotation of the winding device.

[0010] Optionally, the crank includes a connecting rod and a handle connected to one end of the connecting rod, and the end of the connecting rod away from the handle is hingedly connected to the handheld rotating part through a rotating shaft.

[0011] Optionally, the knob assembly includes a knob, which includes the connecting shaft and the hand-held rotating part, and a first groove is provided at one end of the hand-held rotating part away from the connecting shaft, and both ends of the first groove in the length direction pass through the side of the hand-held rotating part, and a receiving groove is provided at one end of the bottom of the first groove. In the retracted state, the handle is at least partially located in the receiving groove.

[0012] Optionally, the accommodating groove has an opening connected to a side surface of the handheld rotating portion, and when the connecting rod rotates around the rotating axis, the handle can pass through the opening of the accommodating groove.

[0013] Optionally, a first inclined surface inclined toward the connecting axis is provided at one end of the bottom of the first groove away from the accommodating groove, and in the expanded state, the connecting rod abuts against the first inclined surface.

[0014] Optionally, the knob assembly further includes a connecting member, which is disposed in the first groove; the first end of the connecting member is provided with two spaced-apart cantilevers; the end of the connecting rod away from the handle is located between the two cantilevers; the connecting rod and the cantilever are hingedly connected via the rotating shaft; the second end of the connecting member is provided with a clearance groove corresponding to the accommodating groove, and the clearance groove is used for the handle to pass through.

[0015] Optionally, a second groove is provided at the bottom of the first groove, and an inserting portion is provided on a side of the connecting member opposite to the bottom of the first groove, the inserting portion being used at least to limit the position of the connecting member along the length direction of the first groove; and / or

[0016] The two side walls of the first groove in the width direction are provided with card slots, and the connecting member is provided with a buckle that cooperates with the card slots. The buckle is at least used to limit the connecting member along the depth direction of the first groove.

[0017] Optionally, a second inclined surface inclined toward the connecting axis is provided on a side of the connecting member away from the bottom surface of the first groove, and an end of the connecting rod away from the handle is inclined toward a side close to the handle.

[0018] Optionally, the handle and the connecting rod are fixedly connected via a fastener or the connecting rod is capable of rotating around the axis of the handle.

[0019] The present application also provides a film developing box, comprising:

[0020] Rinse the box body;

[0021] The rotary drive device is connected to the winding device in the flushing box body.

[0022] The rotary drive device and film developing box disclosed in this application have the following beneficial effects:

[0023] In the present application, a rotary drive device includes a knob assembly and a crank handle. The knob assembly includes a connecting shaft and a handheld rotating portion connected to one end of the connecting shaft. The end of the connecting shaft facing away from the handheld rotating portion is used to connect to a winding device, which is used to wind film. One end of the crank handle is movably connected to the handheld rotating portion so that the other end of the crank handle can be rotated to the outside of the handheld rotating portion in a circumferential direction, thereby putting the rotary drive device into an extended state, or the crank handle can be rotated relative to the handheld rotating portion to be folded onto the handheld rotating portion, thereby putting the rotary drive device into a collapsed state. In the collapsed state, the user can rotate the handheld rotating portion to roll the film onto the winding device. In the extended state, the user can rotate the crank handle to complete film processing, without the need for frequent disassembly of the knob assembly and crank handle.

[0024] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0027] Figure 1 It is a schematic diagram of the folded state of the rotary drive device in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the expanded state of the rotary drive device in an embodiment of the present application.

[0029] Figure 3 It is a front exploded schematic diagram of the rotary drive device in the embodiment of the present application.

[0030] Figure 4 It is a side view of the rotary drive device in the embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the film developing box in the embodiment of the present application.

[0032] Figure 6 It is an exploded schematic diagram of the film developing box in the embodiment of the present application.

[0033] Description of reference numerals:

[0034] 10. Rotational drive device; 100. Knob assembly; 110. Knob; 111. Connecting shaft; 112. Hand-held rotating portion; 1121. First groove; 1122. Accommodating groove; 1123. First inclined surface; 1124. Second groove; 1125. Clamping slot; 120. Connector; 121. Cantilever; 122. Clearance slot; 123. Insertion portion; 124. Buckle; 125. Second inclined surface;

[0035] 200, crank; 210, connecting rod; 220, handle;

[0036] 300, shaft;

[0037] 20. Flushing box body; 30. Winding device. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0039] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0040] The present application is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0041] See also Figures 1 to 3 As shown, in this embodiment, the rotary drive device 10 includes a knob assembly 100 and a crank handle 200. The knob assembly 100 includes a connecting shaft 111 and a handheld rotating portion 112 connected to one end of the connecting shaft 111. The end of the connecting shaft 111 facing away from the handheld rotating portion 112 is connected to a winding device for winding film. The handheld rotating portion 112 is generally cylindrical in shape, and the outer circumferential surface (outer cylindrical surface) of the handheld rotating portion 112 is patterned to improve the user's grip.

[0042] The crank 200 may include a connecting rod 210 and a handle 220 connected to one end of the connecting rod 210. The handle 220 has a shape that is roughly cylindrical or frustum, and the connecting rod 210 has a shape that is roughly a straight rod or a slightly bent rod. The length direction of the connecting rod 210 is roughly perpendicular to the axial direction of the handle 220.

[0043] One end of the connecting rod 210 of the crank 200 is movably connected to the handheld rotating part 112, so that the other end of the crank 200 (at least the handle 220) can be rotated to the outside of the handheld rotating part 112 in the circumferential direction, so that the rotation drive device 10 is in an expanded state, or the crank 200 is rotated relative to the handheld rotating part 112 to be folded on the handheld rotating part 112, so that the rotation drive device 10 is in a folded state.

[0044] Because crank handle 200 is rotatable on handheld rotating portion 112, the distance between the axis of handle 220 and the axis of handheld rotating portion 112 differs between the deployed and retracted states, and the speeds at which the winding device is driven by rotating handheld rotating portion 112 and handle 220 are also different. When rotary drive device 10 is in the retracted state, the user rotates handheld rotating portion 112 to rotate the winding device, which is suitable for winding film onto the winding device. When rotary drive device 10 is in the deployed state, the user grips crank handle 200 to drive handheld rotating portion 112 to rotate the winding device, thereby rotating the winding device. The winding device can be rotated at a predetermined speed to ensure sufficient and even contact between the chemical solution and the film, thereby achieving a better developing effect.

[0045] When developing film in a conventional film developing box, the film is first wound by rotating the take-up mechanism (including the film core) using a knob. Chemical solution is then introduced into the developing box. The knob is then removed and a crank is installed. The crank rotates the take-up mechanism at a predetermined speed to complete film development. Removing and installing the knob and crank is not only cumbersome but also easily lost.

[0046] In this embodiment, the rotary drive device 10 includes a knob assembly 100 and a crank 200. The knob assembly 100 includes a connecting shaft 111 and a handheld rotating portion 112 connected to one end of the connecting shaft 111. The end of the connecting shaft 111 facing away from the handheld rotating portion 112 is connected to a winding device for winding film. One end of the crank 200 is movably connected to the handheld rotating portion 112, so that the other end of the crank 200 can be rotated to the outside of the handheld rotating portion 112 in a circumferential direction, thereby deploying the rotary drive device 10. Alternatively, the crank 200 can be rotated relative to the handheld rotating portion 112 to be folded onto the handheld rotating portion 112, thereby deploying the rotary drive device 10. In the folded state, the user can rotate the handheld rotating portion 112 to wind the film onto the winding device. In the extended state, the user can rotate the crank 200 to complete film processing, eliminating the need for frequent disassembly of the knob assembly 100 and the crank 200.

[0047] In some embodiments, the end of the connecting rod 210 facing away from the handle 220 is hingedly connected to the handheld rotating portion 112 via a rotating shaft 300 .

[0048] The connecting rod 210 is hingedly connected to the handheld rotating portion 112 , which makes the structure of expanding or retracting the crank 200 simpler and reduces the manufacturing cost of the rotation driving device 10 .

[0049] It should be noted that the connecting rod 210 can be hingedly connected to the handheld rotating portion 112, but is not limited thereto. The connecting rod 210 can also be slidably connected to the handheld rotating portion 112, depending on the specific situation. The connecting rod 210 is slidably connected to the handheld rotating portion 112, that is, the connecting rod 210 can be inserted into the handheld rotating portion 112, so that the handle 220 is close to the handheld rotating portion 112 or partially located in the handheld rotating portion 112, thereby placing the rotation drive device 10 in a retracted state; the connecting rod 210 can slide out of the handheld rotating portion 112, so that the handle 220 is away from the handheld rotating portion 112 and located circumferentially outside the handheld rotating portion 112, thereby placing the rotation drive device 10 in an extended state.

[0050] In some embodiments, the handle 220 and the connecting rod 210 are fixedly connected by fasteners.

[0051] When the handle 220 is fixedly connected to the connecting rod 210 , the structure of the rotary drive device 10 is simpler, which can reduce the manufacturing cost of the rotary drive device 10 .

[0052] It should be noted that the handle 220 and the connecting rod 210 can be fixedly connected, but are not limited thereto. The handle 220 and the connecting rod 210 can also be rotatably connected, that is, the connecting rod 210 can rotate about the axis of the handle 220, and the specific connection can be determined according to the specific situation. The connecting rod 210 can rotate about the axis of the handle 220. The user can grip the handle 220 and shake the connecting rod 210, so that the crank handle 200 drives the winding device to rotate more smoothly.

[0053] In some embodiments, the knob assembly 100 includes a knob 110, which includes a connecting shaft 111 and a handheld rotating portion 112. The handheld rotating portion 112 is provided with a first groove 1121 at one end away from the connecting shaft 111. The two ends of the first groove 1121 in the length direction pass through the circumferential side surface of the handheld rotating portion 112. The first groove 1121 can be a linear groove, and the cross-section of the first groove 1121 is rectangular. A receiving groove 1122 is provided at one end of the bottom of the first groove 1121. In the retracted state, the handle 220 is at least partially located in the receiving groove 1122. The rotating shaft 300 can be provided on the side wall of the first groove 1121 and close to the top opening of the first groove 1121. The receiving groove 1122 and the rotating shaft 300 are respectively located at the two ends of the length direction of the first groove 1121.

[0054] In the folded state, the handle 220 is located in the receiving groove 1122 at the bottom of the first groove 1121, and the connecting rod 210 is at least partially located in the first groove 1121. This prevents the crank 200 from interfering with other structures when the reeling device is rotated by the knob 110. In addition, by folding and storing the crank 200, it is also prevented from affecting the user's grip on the knob 110.

[0055] In some embodiments, the receiving groove 1122 has an opening that communicates with the circumferential side of the handheld rotating portion 112. That is, the receiving groove 1122 is a U-shaped groove, and the inner radius of the receiving groove 1122 can be slightly larger than the maximum outer radius of the handle 220. When the connecting rod 210 rotates about the rotating axis 300, the handle 220 can pass through the opening of the receiving groove 1122.

[0056] When the accommodating groove 1122 is a U-shaped groove, the inner radius of the accommodating groove 1122 can be slightly larger than the maximum outer radius of the handle 220 to avoid excessive gap between the handle 220 and the knob 110, which affects the user's grip on the knob 110.

[0057] In some embodiments, the end of the connecting rod 210 away from the handle 220 is inclined toward the side closer to the handle 220. A first inclined surface 1123 is provided at the bottom of the first groove 1121, away from the receiving groove 1122, and is inclined toward the connecting shaft 111. In the deployed state, the connecting rod 210 abuts against the first inclined surface 1123. The inclination angle of the end of the connecting rod 210 away from the handle 220 and the inclination angle of the first inclined surface 1123 can be substantially the same, so that when the rotary drive device 10 is deployed, the axis of the handle 220 is substantially parallel to the axis of the handheld rotating portion 112 of the knob 110.

[0058] In the unfolded state, the axis of the handle 220 is roughly parallel to the axis of the handheld rotating part 112 of the knob 110. The user holds the handle 220 and shakes the connecting rod 210, driving the winding device to rotate more smoothly through the handheld rotating part 112 and the connecting shaft 111.

[0059] In addition, the mating surface between the connecting end of the connecting rod 210 and the knob 110 and the bottom surface of the first groove 1121 is an arc surface, and a first inclined surface 1123 inclined toward the connecting shaft 111 is provided at the end of the bottom of the first groove 1121 away from the accommodating groove 1122, which can increase the movable space of the connecting end of the connecting rod 210 and the knob 110 and avoid interference between the connecting rod 210 and the knob 110.

[0060] In some embodiments, the knob assembly 100 further includes a connector 120 disposed in the first groove 1121. The first end of the connector 120 is provided with two spaced-apart cantilevers 121. The end of the connecting rod 210 away from the handle 220 is located between the two cantilevers 121. The connecting rod 210 and the cantilevers 121 are hingedly connected via a rotating shaft 300, i.e., the connecting rod 210 and the knob 110 are indirectly connected via the connector 120. The second end of the connector 120 is provided with a clearance groove 122 corresponding to the accommodating groove 1122, which is used for the handle 220 to pass through.

[0061] The connecting rod 210 and the knob 110 are indirectly connected via the connector 120, simplifying the hinged connection structure between the connecting rod 210 and the knob 110. Furthermore, the rotating shaft 300 is located in the first groove 1121, making it less likely for the connecting rod 210 to move and fall off the connecting shaft 120. Furthermore, the indirect connection between the connecting rod 210 and the knob 110 via the connector 120 eliminates the need for a hole for mounting the rotating shaft 300 on the side of the handheld rotating portion 112 of the knob 110, thus preserving the appearance of the knob 110 and the user's grip on the handheld rotating portion 112 of the knob 110.

[0062] In some embodiments, a second groove 1124 is provided at the bottom of the first groove 1121, and the second groove 1124 is located between the accommodating groove 1122 and the first inclined surface 1123. An insert portion 123 is provided on the side of the connector 120 opposite to the bottom of the first groove 1121. The insert portion 123 is used at least to limit the connector 120 along the length direction of the first groove 1121. Since the connector 120 is disposed in the first groove 1121, the first groove 1121 can limit the movement of the connector 120 along the width direction of the first groove 1121, and the insert portion 123 can be used to limit the connector 120 along the length direction of the first groove 1121. The second groove 1124 can be a rectangular cross-section groove, and the insert portion 123 can be a rectangular cross-section cylinder. The insert portion 123 and the second groove 1124 can adopt a small clearance fit or an interference fit.

[0063] When the insertion portion 123 and the second groove 1124 are matched with a small gap, a card slot 1125 can be set on the two side walls in the width direction of the first groove 1121, and a buckle 124 that cooperates with the card slot 1125 is provided on the connecting member 120. The buckle 124 is at least used to limit the connecting member 120 along the depth direction of the first groove 1121.

[0064] It should be noted that the engagement groove 1125 and the buckle 124 cooperate to limit the connector 120 along the depth direction of the first groove 1121, and the insertion portion 123 and the second groove 1124 cooperate to limit the connector 120 along the length direction of the first groove 1121, but the present invention is not limited to this. Alternatively, only the engagement groove 1125 and the buckle 124 or only the insertion portion 123 and the second groove 1124 can be used to achieve three-dimensional positioning of the connector 120, depending on the specific situation. In addition, the knob 110 and the connector 120 can be connected using structures such as the insertion portion 123 and the buckle 124, but the present invention is not limited to this. The knob 110 and the connector 120 can also be bonded together or designed as an integrated structure, depending on the specific situation.

[0065] The knob assembly 100 is divided into a knob 110 and a connector 120. The knob 110 and the connector 120 are connected by structures such as an insert 123 and a snap 124, which can reduce the structural complexity of the knob assembly 100, reduce the manufacturing difficulty of the knob assembly 100 and the manufacturing cost of the rotary drive device 10.

[0066] In some embodiments, the end of the connecting rod 210 away from the handle 220 is inclined toward the side closer to the handle 220. A second inclined surface 125 is provided on the side of the connecting member 120 away from the bottom surface of the first groove 1121, which is inclined toward the connecting shaft 111. The inclination angle of the connecting rod 210 and the inclination angle of the second inclined surface 125 can be substantially the same, or the inclination angle of the second inclined surface 125 can be greater.

[0067] The end of the connecting rod 210 away from the handle 220 is inclined toward the side closer to the handle 220. The end of the connecting rod 210 away from the handle 220 is located in the first groove 1121, and the end of the connecting rod 210 close to the handle 220 is located outside the first groove 1121. The length of the handle 220 can be designed to be longer to facilitate the user's grip on the handle 220. A second inclined surface 125 is provided on the side of the connecting member 120 away from the bottom surface of the first groove 1121 to prevent interference between the connecting rod 210 and the connecting member 120.

[0068] The present application also provides a film developing box, see Figure 5 and Figure 6 As shown, the film developing box includes the above-disclosed rotary drive device 10, a developing box body 20 and a winding device 30. The winding device 30 is arranged in the developing box body 20, and the rotary drive device 10 is connected to the winding device 30 in the developing box body 20.

[0069] In this embodiment, the film developing box includes a rotation drive device 10, which includes a knob assembly 100 and a crank 200. The knob assembly 100 includes a connecting shaft 111 and a handheld rotating portion 112 connected to one end of the connecting shaft 111. The end of the connecting shaft 111 away from the handheld rotating portion 112 is used to connect to the winding device 30, and the winding device 30 is used to wind the film. One end of the crank 200 is movably connected to the handheld rotating portion 112 so that the other end of the crank 200 can be rotated to the outside of the handheld rotating portion 112 in the circumferential direction, so that the rotation drive device 10 is in an expanded state, or the crank 200 is rotated relative to the handheld rotating portion 112 to be folded on the handheld rotating portion 112, so that the rotation drive device 10 is in a collapsed state. In the folded state, the user can rotate the handheld rotating part 112 to roll the film onto the winding device 30. In the unfolded state, the user can rotate the handle 200 to complete film processing without the need to frequently disassemble and assemble the knob assembly 100 and the handle 200.

[0070] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0071] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0072] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A rotary drive device, characterized in that: include: The knob assembly includes a connecting shaft and a handheld rotating portion connected to one end of the connecting shaft, wherein the end of the connecting shaft facing away from the handheld rotating portion is used to connect to a winding device, and the winding device is used to wind the film; a crank, one end of which is movably connected to the handheld rotating portion, so that the other end of the crank can be rotated to the outside of the handheld rotating portion in a circumferential direction to put the rotary drive device into an extended state, or the crank can be rotated relative to the handheld rotating portion to be folded onto the handheld rotating portion to put the rotary drive device into a collapsed state; When the rotary drive device is in a folded state, the user can rotate the handheld rotating part to realize the rotation of the winding device; when the rotary drive device is in an unfolded state, the user can hold the crank to drive the handheld rotating part to rotate and realize the rotation of the winding device.

2. The rotary drive device according to claim 1, characterized in that The crank comprises a connecting rod and a handle connected to one end of the connecting rod, and the end of the connecting rod away from the handle is hingedly connected to the handheld rotating part through a rotating shaft.

3. The rotary drive device according to claim 2, characterized in that: The knob assembly includes a knob, which includes the connecting shaft and the hand-held rotating part. A first groove is provided at one end of the hand-held rotating part away from the connecting shaft. Both ends of the first groove in the length direction pass through the side surfaces of the hand-held rotating part. A receiving groove is provided at one end of the bottom of the first groove. In the retracted state, the handle is at least partially located in the receiving groove.

4. The rotary drive device according to claim 3, characterized in that: The accommodating groove has an opening communicating with a side surface of the handheld rotating portion, and when the connecting rod rotates around the rotating shaft, the handle can pass through the opening of the accommodating groove.

5. The rotary drive device according to claim 3, characterized in that: A first inclined surface inclined toward the connecting shaft is provided at one end of the bottom of the first groove away from the accommodating groove. In the expanded state, the connecting rod abuts against the first inclined surface.

6. The rotary drive device according to claim 3 or 5, characterized in that: The knob assembly also includes a connecting member, which is arranged in the first groove. The first end of the connecting member is provided with two cantilevers arranged at intervals. The end of the connecting rod away from the handle is located between the two cantilevers. The connecting rod and the cantilever are hingedly connected through the rotating shaft. The second end of the connecting member is provided with a makeshift groove corresponding to the accommodating groove, and the makeshift groove is used for the handle to pass through.

7. The rotary drive device according to claim 6, characterized in that: A second groove is provided at the bottom of the first groove, and an inserting portion is provided on a side of the connecting member opposite to the bottom of the first groove, the inserting portion being used at least to limit the position of the connecting member along the length direction of the first groove; and / or The two side walls of the first groove in the width direction are provided with card slots, and the connecting member is provided with a buckle that cooperates with the card slots. The buckle is at least used to limit the connecting member along the depth direction of the first groove.

8. The rotary drive device according to claim 6, wherein: The connecting member is provided with a second inclined surface inclined toward the connecting axis on a side away from the bottom surface of the first groove, and the end of the connecting rod away from the handle is inclined toward a side close to the handle.

9. The rotary drive device according to claim 2, wherein: The handle and the connecting rod are fixedly connected via a fastener or the connecting rod is rotatable around the axis of the handle.

10. A film developing box, characterized in that: include: Rinse the box body; The rotary drive device according to any one of claims 1 to 9, wherein the rotary drive device is connected to the winding device in the flushing box body.

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