Control device of photographic support device and photographic support device

Abstract

The invention discloses a control device of a photography supporting device and the photography supporting device.The photography supporting device comprises supporting legs, the supporting legs are provided with hydraulic opening and closing mechanisms, the hydraulic opening and closing mechanisms are used for controlling the supporting legs to move, the control device is used for controlling the hydraulic opening and closing mechanisms, and the control device comprises a driving cylinder body, a piston rod, an operation handle and a locking mechanism; wherein the driving cylinder body is connected with the hydraulic opening and closing mechanism; the piston rod is movably and slidably arranged in the driving cylinder body, and at least one of the two ends of the piston rod is exposed out of the driving cylinder body; the operating handle is in transmission connection with the end, exposed out of the driving cylinder, of the piston rod and used for driving the piston rod to move relative to the driving cylinder. And the locking mechanism acts on the exposed end of the piston rod, so that the piston rod and the driving cylinder body are in a relatively fixed state or a relatively movable state. According to the control device, the locking mechanism directly acts on the exposed end of the piston rod, and the loosening risk existing when the operating handle and the driving cylinder body are locked is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of general photography equipment, in particular to a control device of a photography support device and a photography support device using the control device. BACKGROUND

[0002] The photography support device is an auxiliary equipment for stabilizing photography equipment. The photography support device can be a tripod or a stabilizing gimbal. The main function of the photography support device is to support a camera, a video camera or other photography equipment through adjustable support legs to ensure the stability and anti-shake effect of the equipment during shooting. The photography support device usually includes a main frame, support legs and a locking mechanism. A user can drive a hydraulic system to adjust the extension and locking state of the support legs by operating a control handle.

[0003] In the existing photography support device, the support leg locking assembly is usually locked or unlocked by a hydraulic cylinder and a handle. The piston rod of the hydraulic cylinder is movably connected with the handle. The rotation or pulling of the handle drives the movement of the piston rod, thereby changing the oil path state of the hydraulic chamber to control the locking of the support legs. However, in the stable locking state of the oil path, the handle is easily affected by external collision or unintentional touch of the user, which causes the handle to move accidentally, thereby causing the oil path to change, resulting in the locking failure of the support legs, and causing the safety hazards of equipment falling or shooting interruption.

[0004] Therefore, there is an urgent need for a control device of a photography support device which can prevent the problem of locking failure of the support legs caused by accidental touch of the handle. SUMMARY

[0005] The main purpose of the present application is to provide a control device of a photography support device which can prevent the problem of locking failure of the support legs caused by accidental touch of the handle.

[0006] To achieve the above purpose, the present application provides a control device of a photography support device, the photography support device including support legs, the support legs being provided with a hydraulic opening and closing mechanism for controlling the movement of the support legs, the control device being used for controlling the hydraulic opening and closing mechanism, the control device including: a drive cylinder body connected with the hydraulic opening and closing mechanism; a piston rod movably slidingly arranged in the drive cylinder body, and at least one end of the piston rod being exposed to the drive cylinder body; an operation handle drivingly connected with the exposed end of the piston rod, the operation handle being used to drive the movement of the piston rod relative to the drive cylinder body; A locking mechanism acting on an exposed end of the piston rod to make the piston rod relatively fixed or relatively movable with the drive cylinder.

[0007] In some embodiments, one end of the operating handle is rotatably connected with the drive cylinder, and the other end is a free end. The locking mechanism comprises a linkage assembly, one end of which is hinged with the operating handle, and the other end is hinged with one end of the piston rod exposed to the drive cylinder. The linkage assembly has a dead point position, when the linkage assembly is at the dead point position, the piston rod is relatively fixed with the drive cylinder; when the linkage assembly passes the dead point position, the piston rod is relatively movable with the drive cylinder.

[0008] In some embodiments, the drive cylinder is provided with a rotating connection part, which is arranged on one side of the exposed end of the piston rod, and one end of the operating handle is hinged with the rotating connection part. The part of the operating handle between the free end and the hinged end is hinged with one end of the linkage assembly.

[0009] In some embodiments, the linkage assembly comprises: A first linkage, one end of which is connected with the operating handle. A second linkage, one end of which is hinged with the other end of the first linkage, and the other end of which is hinged with one end of the piston rod exposed to the drive cylinder. When the second linkage is in a collinear state with the axis of the piston rod, the linkage assembly is at the dead point position.

[0010] In some embodiments, the control device further comprises a seal in the drive cylinder, and the other end of the piston rod is connected with the locking mechanism through the seal.

[0011] In some embodiments, the locking mechanism comprises: A limiting cylinder, one end of which is connected with the drive cylinder, the limiting cylinder having a sliding cavity, and the other end of the piston rod is arranged in the sliding cavity; the cavity wall of the sliding cavity is provided with a guide part and a blocking part at intervals: A rotating sleeve, which is rotatably arranged at the other end of the piston rod, the peripheral wall of the rotating sleeve being provided with a matching part which can slide with the guide part, and the rotating sleeve can be driven by external force to make the matching part turn to the guide part, or make the matching part turn to the blocking part.

[0012] In some embodiments, the guide portion is a guide rib protruding from the cavity wall, and the blocking portion is a limiting gap formed at one end of the guide rib away from the driving cylinder; The guide portion is a groove between two adjacent guide ribs. The matching portion is a sliding rib protruding from the rotating sleeve.

[0013] In some embodiments, the control device further comprises an unlocking mechanism arranged in the limiting cylinder, the unlocking mechanism being capable of driving the rotating sleeve to move so as to make the matching portion turn to the guide portion or make the matching portion turn to the blocking portion.

[0014] In some embodiments, the unlocking mechanism comprises a turning seat arranged at one end of the limiting cylinder away from the driving cylinder, and a turning gear ring capable of extending into the sliding cavity, the turning gear ring comprising a plurality of continuous guide sawteeth, each of the guide sawteeth having a guide slope. The sliding rib is provided with a sliding slope at one end thereof toward the turning seat, the sliding slope being capable of sliding along the guide slope.

[0015] In some embodiments, the locking mechanism comprises: a fixing seat connected with the driving cylinder, the fixing seat being provided with two spaced-apart vertical plates; a sliding plate connected with the other end of the piston rod, the sliding plate being capable of slidingly extending into the space between the two vertical plates; a locking pin arranged in one of the vertical plate and the sliding plate; a locking structure arranged in the other of the vertical plate and the sliding plate, the locking structure being capable of separably engaging with the locking pin; When the locking pin engages with the locking structure, the piston rod and the driving cylinder are in a relatively fixed state, and when the locking pin is separated from the locking structure, the piston rod and the driving cylinder are in a relatively movable state.

[0016] In some embodiments, the control device further comprises a swing rod, one end of the swing rod being swingably connected with the vertical plate, and the other end of the swing rod being provided with the locking pin; The locking structure comprises a guide slide formed in the sliding plate, the guide slide being used for the locking pin to slideably extend into, the guide slide having a dead point position; When the locking pin is at the dead point position of the guide slide, the piston rod and the driving cylinder are in a relatively fixed state, and when the locking pin is separated from the dead point position of the guide slide, the piston rod and the driving cylinder are in a movable state.

[0017] In some embodiments, the guiding slide comprises a heart-shaped slide and a straight slide in communication with the heart-shaped slide; wherein: the heart-shaped slide comprises a first connecting section and a second connecting section, a first end of the first connecting section in communication with a last end of the second connecting section, and the dead point position is arranged between the first end of the first connecting section and the last end of the second connecting section; the straight slide is in communication with a last end of the first connecting section and a first end of the second connecting section.

[0018] In some embodiments, the vertical plate is provided with a straight groove, and the locking pin is arranged on the sliding plate and slidably penetrates the straight groove; the locking structure comprises a locking member movably arranged on the vertical plate, and the locking member has a clamping groove matched with the locking pin; wherein, when the locking pin is clamped with the clamping groove, the piston rod and the driving cylinder are in a relatively fixed state; when the locking pin is separated from the clamping groove, the piston rod and the driving cylinder are in a movable state.

[0019] In some embodiments, an end of the locking pin away from the sliding plate is exposed outside the straight groove; one end of the locking member is hinged to the vertical plate, and the other end is a free end, and the clamping groove is arranged between the hinged end and the free end of the locking member, and the clamping groove can be clamped with the exposed end of the locking pin.

[0020] In some embodiments, the vertical plate is provided with a first hinged part and a second hinged part, and the first hinged part and the second hinged part are arranged on both sides of the straight groove; one end of the locking member is hinged to the first hinged part, and the free end of the locking member is provided with a third hinged part; the control device further comprises a tension spring, one end of the tension spring is hinged to the second hinged part, and the other end is hinged to the third hinged part.

[0021] In some embodiments, the locking pin is of telescopic structure, and an end of the clamping groove is provided with a guide inclined surface, the guide inclined surface can abut against the exposed end of the locking pin, and the guide inclined surface is used to abut against the exposed end of the locking pin in the trend of compressing the locking pin when an external force drives the free end of the locking member to move.

[0022] In some embodiments, the other end of the piston rod is provided with a locking step in the peripheral wall; the locking mechanism comprises: a clamping member comprising a connecting plate and clamping jaws arranged on both sides of the connecting plate, the connecting plate is used to connect with the driving cylinder; the two clamping jaws can move towards or away from each other; Wherein, when the two claws are engaged with the locking step, the piston rod and the driving cylinder are in a relatively fixed state; when the two claws are separated from the locking step, the piston rod and the driving cylinder are in a relatively movable state.

[0023] In some embodiments, the other end of the piston rod is configured with a tapered portion, and the locking step is arranged adjacent to the tapered portion, and the tapered portion can squeeze the two claws to move the two claws in opposite directions.

[0024] In some embodiments, the control device further comprises an expansion sleeve, which is slidably sleeved outside the clamping member, and the expansion sleeve has a tapered surface that can extend into the two claws, and the expansion sleeve is driven by external force to drive the tapered surface to move the two claws in opposite directions.

[0025] In some embodiments, the control device comprises a hollow mounting sleeve, one end of the mounting sleeve is connected with the driving cylinder, and the other end is an open end through which the tapered surface can extend; the mounting sleeve is sleeved outside the clamping member. The expansion sleeve is recessed with a mounting groove, and the mounting groove is sleeved outside the mounting sleeve, and the bottom wall of the mounting groove is configured with the tapered surface.

[0026] In some embodiments, the control device further comprises a resilient reset member, one end of the resilient reset member abuts against the bottom wall of the mounting groove, and the other end abuts against the end of the mounting sleeve away from the driving cylinder, and the resilient reset member is used to drive the expansion sleeve to move away from the mounting sleeve, so that the tapered surface moves away from the clamping member.

[0027] Further, the present application provides a photographic support device, comprising: A support leg, the support leg is provided with a hydraulic opening and closing mechanism, and the hydraulic opening and closing mechanism is used to control the movement of the support leg. The control device as described in the foregoing embodiments is used to control the hydraulic opening and closing mechanism.

[0028] The control device of the present application directly acts on the exposed end of the piston rod through the locking mechanism, and configures the piston rod and the driving cylinder to be in a relatively fixed state or a relatively movable state. The different arrangement of the control device enables the locking mechanism to directly control the sliding freedom of the piston rod independently of the operation handle, avoiding the potential loosening risk of the locking structure in the prior art which depends on the connection between the operation handle and the cylinder body, thereby improving the locking reliability and operation stability of the control device. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The control device of the photographic support device of the present application in an embodiment is shown in the structural schematic view. Figure 2 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 3 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 1 Top view of the control device of the photographic support device of the present application in a state, and sectional view at A-A in the top view; Figure 4 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 1 Top view of the control device of the photographic support device of the present application in another state, and sectional view at B-B in the top view; Figure 5 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 6 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 5 Top view of the control device of the photographic support device of the present application in a preferred embodiment, and sectional view at C-C in the top view; Figure 7 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 5 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 8 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 9 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 10 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 9 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 11 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 9 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 12 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 13 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 12 Structure diagram of the control device of the photographic support device of the present application in another embodiment; Figure 14 Structure diagram of the control device of the photographic support device of the present application in another preferred embodiment; Figure 15 Structure diagram of the control device of the photographic support device of the present application in another preferred embodiment; Figure 14 Structure diagram of the control device of the photographic support device of the present application in another preferred embodiment; Figure 16 Structure diagram of the control device of the photographic support device of the present application in another preferred embodiment; Figure 15 Sectional view at D-D. Detailed Implementation

[0030] The solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0033] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0034] This application discloses a control device for a photographic support device. The photographic support device includes a tripod, gimbal, or other support structure for mounting photographic equipment such as cameras and camcorders. The photographic support device generally includes support legs, each equipped with a hydraulic opening and closing mechanism. This hydraulic opening and closing mechanism controls the movement of the support legs, and the control device controls the hydraulic opening and closing mechanism. (See reference...) Figure 1 , Figure 5 and Figure 14 The above figures are schematic diagrams of several preferred embodiments of the control device proposed in this application, which can be referred to first. Figure 1 The control device proposed in this application includes: Drive cylinder 1, which is connected to the hydraulic opening and closing mechanism; Piston rod 2 is movably and slidably disposed within drive cylinder 1, and at least one end of piston rod 2 is exposed outside drive cylinder 1; Operating handle 3 is connected to the end of piston rod 2 exposed in drive cylinder 1. Operating handle 3 is used to drive piston rod 2 to move relative to drive cylinder 1. The locking mechanism 4 acts on the exposed end of the piston rod 2 to make the piston rod 2 and the drive cylinder 1 relatively fixed or relatively movable.

[0035] In this application, the control device is configured by connecting a drive cylinder 1 to a hydraulic opening and closing mechanism. The drive cylinder 1 is a hydraulic cylinder for transmitting control force, and it has a piston chamber into which a piston rod 2 can slide. The piston chamber is connected to at least one oil outlet, which is connected to the hydraulic opening and closing mechanism. The piston rod 2 is movably and slidably disposed within the drive cylinder 1, and at least one end of the piston rod 2 is exposed outside the drive cylinder 1. The piston rod 2 drives hydraulic oil to flow through at least one oil outlet by sliding within the piston chamber, thereby adjusting the opening and closing state of the hydraulic opening and closing mechanism. An operating handle 3 is provided, which is connected to one end of the piston rod 2 exposed in the drive cylinder 1. The transmission connection includes the transmission connection between the operating handle 3 and the exposed end of the piston rod 2. For example, the two can be directly connected, allowing relative rotation, sliding, and a combination of rotation and sliding, or they can be indirectly connected, achieving relative rotation, sliding, and a combination of rotation and sliding through an intermediate connector. The operating handle 3 is used to drive the piston rod 2 to move relative to the drive cylinder 1. By setting a locking mechanism 4 acting on the exposed end of the piston rod 2, the locking mechanism 4 is used to keep the piston rod 2 and the drive cylinder 1 in a relatively fixed state or a relatively movable state, thereby realizing precise manual control and stable locking of the hydraulic opening and closing mechanism of the support foot.

[0036] It is understandable that at least one end of the piston rod 2 is exposed outside the drive cylinder 1, which includes the following two situations; When only one end of the piston rod 2 is exposed outside the drive cylinder 1, the operating handle 3 is connected to the exposed end in a transmission manner, and the locking mechanism 4 acts on the exposed end.

[0037] When both ends of the piston rod 2 are exposed outside the drive cylinder 1, the operating handle 3 is connected to one of the ends in a transmission manner, and the locking mechanism 4 can act on either exposed end or both ends simultaneously. The middle part of the piston rod 2 is slidably disposed inside the drive cylinder 1.

[0038] In the prior art, the drive device is usually set up using a mechanical direct locking structure. When locking and unlocking the operating handle, the prior art usually locks it by rotating or pressing the handle, which directly acts on the locking structure between the operating handle and the drive cylinder. For example, a snap-fit ​​structure is set between the operating handle and the drive cylinder to lock and unlock, thereby configuring the operating handle and the drive cylinder to be in a relatively fixed state or a relatively movable state.

[0039] The control device of this application directly acts on the exposed end of the piston rod 2 through the locking mechanism 4, configuring the piston rod 2 and the drive cylinder 1 in a relatively fixed state or a relatively movable state. This different arrangement allows the locking mechanism 4 to directly control the sliding degree of freedom of the piston rod 2 independently of the operating handle 3, avoiding the potential loosening risk of the locking structure in the prior art that relies on the connection between the operating handle and the cylinder, thereby improving the locking reliability and operational stability of the control device.

[0040] When only one end of the piston rod 2 is exposed outside the drive cylinder 1, in a preferred embodiment, refer to... Figures 1 to 4 The operating handle 3 proposed in this application is rotatably connected to the drive cylinder 1 at one end, and the other end is a free end; The locking mechanism 4 includes a linkage assembly 41, one end of which is hinged to the operating handle 3, and the other end is hinged to the end of the piston rod 2 that is exposed outside the drive cylinder 1. The connecting rod assembly 41 has a dead point position. When the connecting rod assembly 41 is in the dead point position, the piston rod 2 and the drive cylinder 1 are in a relatively fixed state. When the connecting rod assembly 41 passes the dead point position, the piston rod 2 and the drive cylinder 1 are in a relatively movable state.

[0041] In this embodiment, one end of the operating handle 3 is rotatably connected to the drive cylinder 1, and the other end is a free end, so that the operating handle 3 can drive the connecting rod assembly 41 by rotation. As a preferred embodiment, the locking mechanism 4 includes the connecting rod assembly 41, one end of which is hinged to the operating handle 3, and the other end of which is hinged to the end of the piston rod 2 exposed in the drive cylinder 1, so that the connecting rod assembly 41 can convert the rotation of the operating handle 3 into the sliding motion of the piston rod 2 relative to the drive cylinder 1. The connecting rod assembly 41 has a dead point position, so that the connecting rod assembly 41 can form a self-locking structure when it is in the dead point position.

[0042] When the operating handle 3 is rotated, the connecting rod assembly 41 is driven by the operating handle 3, thereby driving the piston rod 2 to slide relative to the drive cylinder 1 to adjust the opening and closing state of the hydraulic opening and closing mechanism. When the connecting rod assembly 41 is driven to the dead point position by the operating handle 3, the hinge point of the connecting rod assembly 41 is collinear or passes through the dead point, forming a rigid support, so that external forces (such as hydraulic pressure) cannot drive the connecting rod assembly 41 past the dead point in the reverse direction, thereby making the piston rod 2 and the drive cylinder 1 relatively fixed, achieving self-locking. When the operating handle 3 is rotated in the reverse direction to make the connecting rod assembly 41 pass through the dead point position, the connecting rod assembly 41 disengages from the self-locking state, making the piston rod 2 and the drive cylinder 1 relatively movable. The user can continue to drive the piston rod 2 by driving the connecting rod assembly 41 through the operating handle 3. The force driving the reverse rotation of the operating handle 3 can be the force applied by the user to the operating handle 3, or it can be an external force such as a motor or cylinder, which is not limited here.

[0043] Please continue to refer to Figures 1 to 4 In some embodiments, the drive cylinder 1 is provided with a rotating connection part 101, which is spaced apart on one side of the exposed end of the piston rod 2, and one end of the operating handle 3 is hinged to the rotating connection part 101. The part of the operating handle 3 located between the free end and the hinged end is hinged to one end of the connecting rod assembly 41.

[0044] The drive cylinder 1 proposed in this application embodiment is provided with a rotating connection part 101. The rotating connection part 101 is a component used to provide a rotation fulcrum for the operating handle 3. The rotating connection part 101 is spaced apart on one side of the exposed end of the piston rod 2, so that one end of the operating handle 3 can be hinged to the rotating connection part 101, thereby forming a lever structure with the rotating connection part 101 as the fulcrum. The part of the operating handle 3 located between the free end and the hinged end is hinged to one end of the connecting rod assembly 41, so that the rotation of the operating handle 3 can effectively drive the connecting rod assembly 41 to move.

[0045] When the user rotates the free end of the operating handle 3, the operating handle 3 rotates around the rotating connection part 101 as the fulcrum. The part located between the free end and the hinge end drives one end of the connecting rod assembly 41 to move, thereby causing the connecting rod assembly 41 to move as a whole and drive the piston rod 2 to slide relative to the drive cylinder 1, so as to adjust the opening and closing state of the hydraulic opening and closing mechanism. When the connecting rod assembly 41 is driven to the dead point position, the connecting rod assembly 41 forms a self-locking rigid support, so that external force cannot drive the connecting rod assembly 41 past the dead point, thereby achieving relative fixation between the piston rod 2 and the drive cylinder 1. When the user rotates the operating handle 3 in the opposite direction, the connecting rod assembly 41 passes the dead point position and disengages from self-locking, so that the piston rod 2 can move relative to the drive cylinder 1.

[0046] This configuration separates the hinged position of the operating handle 3 from the hinged position of the connecting rod assembly 41, forming a more optimized lever transmission ratio. This allows the user to apply a smaller force to drive the connecting rod assembly 41 and piston rod 2, while maintaining the stability of dead-point self-locking. This improves the ease of operation and the compactness of the control device.

[0047] Please continue to refer to Figures 1 to 4 In some embodiments, the linkage assembly 41 includes: First link 411, one end of the first link 411 is connected to the operating handle 3; The second connecting rod 412 has one end hinged to the other end of the first connecting rod 411, and the other end of the second connecting rod 412 is hinged to the piston rod 2 exposed at one end of the drive cylinder 1. When the axis of the second connecting rod 412 is collinear with that of the piston rod 2, the connecting rod assembly 41 is in the dead position.

[0048] The linkage assembly 41 proposed in this application embodiment includes a first linkage 411 and a second linkage 412. One end of the first linkage 411 is connected to the operating handle 3, so that the rotation of the operating handle 3 can drive the first linkage 411 to move. One end of the second linkage 412 is hinged to the other end of the first linkage 411, and the other end of the second linkage 412 is hinged to the piston rod 2 exposed at one end of the drive cylinder 1, so that the movement of the first linkage 411 can be transmitted to the second linkage 412 through the hinge, thereby driving the piston rod 2 to slide relative to the drive cylinder 1. When the axis of the second linkage 412 and the piston rod 2 are collinear, the linkage assembly 41 is in a dead position, so that this collinear state can form a specific self-locking condition.

[0049] When the user rotates the operating handle 3, the first connecting rod 411 is driven to move, and pushes or pulls the second connecting rod 412 through the hinge, thereby causing the second connecting rod 412 to drive the piston rod 2 to slide relative to the drive cylinder 1, so as to adjust the opening and closing state of the hydraulic opening and closing mechanism. When the operating handle 3 is rotated to the point where the axes of the second connecting rod 412 and the piston rod 2 are collinear, the hinge point of the connecting rod assembly 41 is aligned with the force line, forming a self-locking point above the dead center. At this time, the action of external force (such as hydraulic pressure) along the axis of the piston rod 2 cannot generate a torque that causes the second connecting rod 412 to deviate from the collinearity, thereby keeping the connecting rod assembly 41 stable and achieving a relatively fixed state between the piston rod 2 and the drive cylinder 1. When the user rotates the operating handle 3 in the opposite direction, the first connecting rod 411 drives the second connecting rod 412 to deviate from the collinearity, and the connecting rod assembly 41 passes the dead center position and disengages from the self-locking point, allowing the piston rod 2 to move relative to the drive cylinder 1.

[0050] When both ends of the piston rod 2 are exposed outside the drive cylinder 1, one end of the piston rod 2 is connected to the operating handle 3 for transmission, and the other end of the piston rod 2 is connected to the locking mechanism 4. At this time, the middle part of the piston rod 2 is slidably set inside the drive cylinder 1.

[0051] Please refer to Figures 5 to 8 In a preferred embodiment, the control device further includes a seal 10 located within the drive cylinder 1, and the other end of the piston rod 2 passes through the seal 10 and is connected to the locking mechanism 4.

[0052] The control device proposed in this application embodiment, based on the structure in which both ends of the piston rod 2 are exposed outside the drive cylinder 1, also provides a sealing member 10 located inside the drive cylinder 1. The sealing member 10 is a component used to seal the gap between the piston rod 2 and the drive cylinder 1. The other end of the piston rod 2 passes through the sealing member 10 and is connected to the locking mechanism 4, so that while the middle part of the piston rod 2 can slide inside the drive cylinder 1, the other end can extend to the outside of the drive cylinder 1 and connect to the locking mechanism 4.

[0053] The operating handle 3 drives one end of the piston rod 2, causing the piston rod 2 to slide axially relative to the drive cylinder 1. The middle part of the piston rod 2 moves within the piston chamber of the drive cylinder 1 to change the hydraulic oil pressure inside the chamber and adjust the opening and closing state of the hydraulic opening and closing mechanism through the oil outlet. When the other end of the piston rod 2 passes through the seal 10, the seal 10 wraps around the outer peripheral wall of the piston rod 2, preventing hydraulic oil from leaking to the outside along the gap between the piston rod 2 and the drive cylinder 1. At the same time, the seal 10 allows the piston rod 2 to slide relative to it, thus not hindering the normal movement of the piston rod 2. The locking mechanism 4 acts on the exposed part of the other end of the piston rod 2. When the locking mechanism 4 fixes the piston rod 2 and the drive cylinder 1 in a relatively fixed state, the piston rod 2 cannot slide, and the position of the hydraulic opening and closing mechanism is maintained. When the locking mechanism 4 makes the piston rod 2 and the drive cylinder 1 relatively movable, the piston rod 2 can slide freely for adjustment. In one embodiment, both exposed ends of the piston rod 2 are penetrated by the seal 10.

[0054] Please continue to refer to Figures 5 to 8 In a preferred embodiment, the locking mechanism 4 includes: The limiting cylinder 42 is connected to the drive cylinder 1 at one end. The limiting cylinder 42 has a sliding cavity 420, and the other end of the piston rod 2 passes through the sliding cavity 420. The cavity wall of the sliding cavity 420 is provided with guide parts 421 and blocking parts 422 at intervals. Rotary sleeve 43 is rotatably disposed at the other end of piston rod 2. The peripheral wall of rotating sleeve 43 is provided with a mating part 431 that can slide with guide part 421. Rotary sleeve 43 can be driven by external force to make mating part 431 turn towards guide part 421 or turn mating part 431 towards blocking part 422.

[0055] The locking mechanism 4 proposed in this application embodiment includes a limiting cylinder 42. One end of the limiting cylinder 42 is connected to the driving cylinder 1 and has a sliding cavity 420. The other end of the piston rod 2 passes through the sliding cavity 420. The cavity wall of the sliding cavity 420 is provided with a guide portion 421 and a blocking portion 422 at intervals. The rotating sleeve 43 is rotatably disposed at the other end of the piston rod 2. Its peripheral wall is provided with a mating portion 431 that can slide and cooperate with the guide portion 421. The rotating sleeve 43 can be driven by an external force to make the mating portion 431 turn towards the guide portion 421 or towards the blocking portion 422.

[0056] When the mating part 431 rotates to the position corresponding to the guide part 421, the mating part 431 and the guide part 421 slide into each other, so that the piston rod 2 can drive the rotating sleeve 43 to slide axially relative to the limiting cylinder 42, thereby making the piston rod 2 and the drive cylinder 1 relatively movable. The user can adjust the opening and closing state of the hydraulic opening and closing mechanism by sliding one end of the piston rod 2 through the operating handle 3.

[0057] When the rotating sleeve 43 is driven to rotate by an external force, causing the mating part 431 to turn towards the blocking part 422, the mating part 431 abuts against the blocking part 422, blocking the axial sliding of the piston rod 2, so that the piston rod 2 and the drive cylinder 1 are in a relatively fixed state, thereby locking the current position of the hydraulic opening and closing mechanism.

[0058] Specifically, in some embodiments, the guide portion is a guide rib 423 protruding from the cavity wall, and the blocking portion 422 is a limiting notch constructed at the end of the guide rib 423 away from the drive cylinder 1. The guide section is the groove between two adjacent guide ribs 423; The mating part 431 is a sliding rib protruding from the rotating sleeve 43.

[0059] The guide portion 421 proposed in this embodiment is specifically a guide rib 423 protruding from the cavity wall of the sliding cavity 420, and the blocking portion 422 is a limiting notch constructed at the end of the guide rib 423 away from the drive cylinder 1; the other guide portion is a groove between two adjacent guide ribs 423; and the mating portion 431 is a sliding rib protruding from the rotating sleeve 43.

[0060] When the rotating sleeve 43 is driven to rotate by an external force, causing the sliding rib to turn towards the groove between two adjacent guide ribs 423, the sliding rib can slide along the side wall of the guide rib 423 within the groove, allowing the rotating sleeve 43 and piston rod 2 to slide axially relative to the limiting cylinder 42. This makes the piston rod 2 and the drive cylinder 1 relatively movable, and the user can drive the piston rod 2 to adjust the hydraulic opening and closing mechanism. When the rotating sleeve 43 rotates and causes the sliding rib to turn towards the guide rib 423, the sliding rib slides along the raised surface of the guide rib 423 until the end of the sliding rib abuts against the limiting notch at the end of the guide rib 423 away from the drive cylinder 1. At this time, the limiting notch blocks further axial movement of the sliding rib, preventing the rotating sleeve 43 and piston rod 2 from sliding relative to the limiting cylinder 42. This makes the piston rod 2 and the drive cylinder 1 relatively fixed, locking the current position of the hydraulic opening and closing mechanism.

[0061] Please continue to refer to Figures 5 to 8 In some embodiments, the control device further includes an unlocking mechanism 5, which is disposed in the limiting cylinder 42. The unlocking mechanism 5 can drive the rotating sleeve 43 to move so that the mating part 431 turns towards the guide part 421, or turns the mating part 431 towards the blocking part 422.

[0062] The control device proposed in this application embodiment, based on the structure of the limiting cylinder 42 and the rotating sleeve 43 of the locking mechanism 4, also includes an unlocking mechanism 5. The unlocking mechanism 5 is located in the limiting cylinder 42 and can drive the rotating sleeve 43 to move, so that the mating part 431 turns to the guide part 421 or the blocking part 422.

[0063] When it is necessary to unlock to adjust the hydraulic opening and closing mechanism, the user operates the unlocking mechanism 5 to drive the rotating sleeve 43 to rotate, so that the sliding rib (fitting part 431) disengages from the limiting notch (blocking part 422) and turns to the groove (guide part 421) between the adjacent guide ribs 423. At this time, the sliding rib can slide in the groove, so that the rotating sleeve 43 together with the piston rod 2 can slide axially relative to the limiting cylinder 42, so that the piston rod 2 and the drive cylinder 1 are in a relatively movable state, which makes it easy to drive the piston rod 2 to adjust the opening and closing state by operating the handle 3. After the adjustment is completed, the user operates the unlocking mechanism 5 again to drive the rotating sleeve 43 to rotate, so that the sliding rib turns to the guide rib 423 and gets into the limiting notch. At this time, the limiting notch blocks the axial movement of the sliding rib, so that the piston rod 2 and the drive cylinder 1 are in a relatively fixed state, locking the current position.

[0064] Please continue to refer to Figures 5 to 8 In some embodiments, the unlocking mechanism 5 includes a steering seat 51, which is disposed at one end of the limiting cylinder 42 away from the drive cylinder 1, and is provided with a steering gear ring 52 that can extend into the sliding cavity 420. The steering gear ring 52 includes a plurality of continuous guide teeth 521; each guide tooth 521 has a guide slope. A sliding ramp is provided at the end of the sliding rib facing the steering seat 51, and the sliding ramp can slide along the guide ramp.

[0065] The unlocking mechanism 5 proposed in this application embodiment includes a steering seat 51, which is disposed at one end of the limiting cylinder 42 away from the drive cylinder 1, and has a steering gear ring 52 that can extend into the sliding cavity 420. The steering gear ring 52 includes a plurality of continuous guide serrations 521, each guide serration 521 having a guide slope. A sliding slope is provided at one end of the sliding rib facing the steering seat 51, and the sliding slope can slide along the guide slope.

[0066] When the user pushes or pulls the piston rod 2 axially, the sliding slope of the sliding rib abuts against the guide slope of the guide serration 521 and slides along it. Due to the inclined guiding effect of the guide slope, the sliding slope forces the rotating sleeve 43 and the sliding rib to rotate, thereby causing the sliding rib to gradually turn towards the groove between the adjacent guide ribs 423 or towards the guide ribs 423 and the limiting notch. Specifically, in the unlocking direction, the sliding slope drives the rotating sleeve 43 to rotate along the guide slope, causing the sliding rib to disengage from the limiting notch and enter the groove channel, so that the piston rod 2 can continuously slide axially relative to the limiting cylinder 42, achieving a relatively movable state. In the locking direction, the sliding slope drives the rotating sleeve 43 to rotate along the guide slope, causing the sliding rib to enter the limiting notch and be blocked from axial movement, so that the piston rod 2 and the drive cylinder 1 are in a relatively fixed state.

[0067] The above configuration enables the unlocking mechanism 5 to automatically drive the rotating sleeve 43 to switch between unidirectional and bidirectional rotation by using the sliding inclined surface and the inclined surface of the guide sawtooth 521 to achieve the axial movement of the piston rod 2. No additional manual rotating parts are required. The automatic triggering of unlocking and locking can be completed simply by pushing or pulling the operating handle 3 to drive the piston rod 2, which improves the ease of operation of the control device.

[0068] Please refer to Figure 5 as well as Figures 9 to 11 In another preferred embodiment, the locking mechanism 4 includes: The fixed base 44 is connected to the drive cylinder 1, and the fixed base 44 is provided with two vertical plates 441 spaced apart; The slide plate 45 is connected to the other end of the piston rod 2, and the slide plate 45 can slide between the two upright plates 441; Locking pin 46 is provided on one of the upright plate 441 and the sliding plate 45; A locking structure 47 is provided in the other of the upright plate 441 and the sliding plate 45, and the locking structure 47 is detachably engaged with the locking pin 46. When the locking pin 46 is engaged with the locking structure 47, the piston rod 2 and the drive cylinder 1 are in a relatively fixed state; when the locking pin 46 is separated from the locking structure 47, the piston rod 2 and the drive cylinder 1 are in a relatively movable state.

[0069] The control device proposed in this application, based on the structure that both ends of the piston rod 2 are exposed to the drive cylinder 1, further includes a locking mechanism 4, which includes a fixed seat 44 connected to the drive cylinder 1 and having two spaced-apart upright plates 441; a sliding plate 45 connected to the other end of the piston rod 2 and slidably extending between the two upright plates 441; a locking pin 46 disposed on one of the upright plates 441 and the sliding plate 45; and a locking structure 47 disposed on the other of the upright plates 441 and the sliding plate 45, wherein the locking structure 47 and the locking pin 46 can be detachably engaged.

[0070] When the piston rod 2 slides relative to the drive cylinder 1, the slide plate 45 moves in the sliding direction between the two upright plates 441. When the locking pin 46 engages with the locking structure 47, the locking pin 46 restricts the sliding of the slide plate 45 relative to the upright plates 441, so that the slide plate 45 together with the piston rod 2 cannot move relative to the fixed seat 44 and the drive cylinder 1, realizing the relative fixed state of the piston rod 2 and the drive cylinder 1, and locking the current position of the hydraulic opening and closing mechanism. When the locking pin 46 separates from the locking structure 47, the slide plate 45 can slide freely between the two upright plates 441, so that the piston rod 2 can move relative to the drive cylinder 1. The user can adjust one end of the piston rod 2 by operating the handle 3.

[0071] In one preferred embodiment of this preferred embodiment, the control device further includes a swing rod 48, one end of which is swayably connected to the upright plate 441, and the other end is provided with a locking pin 46. Locking structure 47 includes a guide slide 470 constructed on the slide plate, the guide slide 470 being for the locking pin 46 to slidably extend into, the guide slide 470 having a dead point position. When the locking pin 46 is at the dead point of the guide slide 470, the piston rod 2 and the drive cylinder 1 are in a relatively fixed state; when the locking pin 46 is disengaged from the dead point of the guide slide 470, the piston rod 2 and the drive cylinder 1 are in a movable state.

[0072] The control device proposed in this application embodiment further includes a swing rod 48, one end of which is swayably connected to the upright plate 441, and the other end is provided with a locking pin 46; the locking structure 47 includes a guide slide 470 constructed on the slide plate, the guide slide 470 is used for the locking pin 46 to slide into, and the guide slide 470 has a dead point position. This dead point position can be a blocking position that restricts the locking pin 46.

[0073] When piston rod 2 slides relative to drive cylinder 1, slide plate 45 drives guide slide 470 to move relative to vertical plate 441, and locking pin 46 slides and follows within guide slide 470; when locking pin 46 is guided to dead point position by guide slide 470, the dead point structure of guide slide 470 causes swing rod 48 to form over-dead point self-locking, rigidly supporting locking pin 46 cannot be driven out of dead point by external force (such as force applied by user to move the free end of operating handle 3 away from drive cylinder 1), thereby restricting the sliding of slide plate 45, and causing piston rod 2 to slide out of dead point position. The piston rod 2 is fixed relative to the drive cylinder 1, locking the current position of the hydraulic opening and closing mechanism. When the piston rod 2 slides in the opposite direction (that is, the drive operating handle 3 is facing the drive cylinder 1), the guide slide 470 forces the locking pin 46 to leave the dead position along the swing trajectory of the swing rod 48. The swing rod 48 swings, causing the locking pin 46 to slide along other paths of the guide slide 470, so that the slide plate 45 can slide freely relative to the upright plate 441, realizing that the piston rod 2 and the drive cylinder 1 are in a relatively movable state, which is convenient for adjustment.

[0074] Specifically, in some embodiments, the guide rail 470 includes a heart-shaped rail 4701 and a straight rail 4702 communicating with the heart-shaped rail 4701; wherein: The heart-shaped slide 4701 includes a first connecting section 4703 and a second connecting section 4704. The first end of the first connecting section 4703 is connected to the end of the second connecting section 4704, and the dead point is located between the first end of the first connecting section 4703 and the end of the second connecting section 4704. The straight slide 4702 connects the end of the first connecting section 4703 with the beginning of the second connecting section 4704.

[0075] In the initial state, the free end of the operating handle 3 is located away from the drive cylinder 1 (unlocked state). At this time, the locking pin 46 is located in the straight slide 4702, and the extension direction of the straight slide 4702 is consistent with the sliding direction of the piston rod 2. The sliding plate 45 can slide relative to the upright plate 441, so that the piston rod 2 and the drive cylinder 1 are in a relatively movable state. When the user drives the operating handle 3 to move towards the locking position closer to the drive cylinder 1, the sliding plate 45 drives the guide slide 470 to move relative to the locking pin 46, and the locking pin 46 slides along the first end of the straight slide 4702. Upon reaching the end, it then slides into the beginning of the second connecting section 4704 and continues to slide within the second connecting section 4704 to its end. When the operating handle 3 continues to move to the locked position, the locking pin 46 slides from the end of the second connecting section 4704 into the dead point position. At this time, the dead point position causes the swing rod 48 to pass through the dead point and form a self-locking rigid support. At this time, the user cannot move away from the drive cylinder 1 by driving the free end of the operating handle 3, thereby achieving a relatively fixed state between the piston rod 2 and the drive cylinder 1 and locking the position of the hydraulic opening and closing mechanism.

[0076] When unlocking, the user drives the operating handle 3 to move away from the drive cylinder 1, that is, to move towards the drive cylinder 1. The slide plate 45 drives the guide slide 470 in the opposite direction. The locking pin 46 disengages from the dead point position and slides into the first end of the first connecting section 4703. Then it slides along the first connecting section 4703 to the end of the first connecting section 4703 and enters the straight slide 4702. At this time, the locking pin 46 disengages from the dead point and self-locks, so that the slide plate 45 can slide freely, realizing the relative movable state of the piston rod 2 and the drive cylinder 1.

[0077] In some embodiments, a height difference can be set between the end of the second connecting segment 4704 and the dead point position, and a height difference can be set between the dead point position and the beginning of the first connecting segment 4703. That is, for the bottom wall of the slide, the end of the second connecting segment 4704 is higher than the dead point position, and the dead point position is higher than the beginning of the first connecting segment 4703, so as to prevent the locking pin 46 from moving backward. Similarly, there is also a height difference between the end of the first connecting segment 4703 and the straight slide 4702, with the end of the first connecting segment 4703 being higher than the straight slide 4702, which also serves to prevent backward movement.

[0078] Please refer to Figure 12 and Figure 13 In another preferred embodiment of this preferred embodiment, the upright plate 441 is provided with a straight groove 4110, and the locking pin 46 is disposed on the sliding plate 45 and is slidably inserted through the straight groove 4110. The locking structure 47 includes a locking member 471, which is movably disposed on the upright plate 441. The locking member 471 has a snap-fit ​​groove 4711 that is adapted to the locking pin 46. When the locking pin 46 engages with the locking groove 4711, the piston rod 2 and the drive cylinder 1 are in a relatively fixed state; when the locking pin 46 disengages from the locking groove, the piston rod 2 and the drive cylinder 1 are in a movable state.

[0079] The control device proposed in this application embodiment, based on the fixed base 44 and slide plate 45 structure of the locking mechanism 4, further provides a straight groove 4110 in the upright plate 441, and the locking pin 46 is disposed on the slide plate 45 and slidably passes through the straight groove 4110; the locking structure 47 includes a locking member 471, which is movably disposed on the upright plate 441 and has a snap-fit ​​groove 4711 adapted to the locking pin 46.

[0080] When the piston rod 2 slides relative to the drive cylinder 1, the slide plate 45 drives the locking pin 46 to slide along the straight groove 4110 in the vertical plate 441. The straight groove 4110 restricts the movement trajectory of the locking pin 46 to a straight line, ensuring the movement direction of the slide plate 45. The extension direction of the straight groove 4110 is consistent with the movement direction of the piston rod 2. When the locking member 471 moves to engage the locking groove 4711 with the locking pin 46, the locking groove 4711 restricts the further sliding of the locking pin 46 along the straight groove 4110, thereby fixing the position of the slide plate 45, so that the piston rod 2 and the drive cylinder 1 are in a relatively fixed state, locking the current position of the hydraulic opening and closing mechanism. When the locking member 471 moves to disengage the locking groove 4711 from the locking pin 46, the locking pin 46 can slide freely in the straight groove 4110, so that the slide plate 45 can move relative to the vertical plate 441, realizing that the piston rod 2 and the drive cylinder 1 are in a relatively movable state, which makes it convenient to drive the piston rod 2 to adjust the opening and closing state by operating the handle 3.

[0081] Please continue to refer to Figure 12 and Figure 13 In some embodiments, the upright plate 441 is provided with a first hinge portion 4111 and a second hinge portion 4112, with the first hinge portion 4111 and the second hinge portion 4112 respectively disposed on both sides of the straight groove 4110. One end of the locking member 471 is hinged to the first hinge portion 4111, and the free end of the locking member 471 is provided with a third hinge portion. The control device also includes a tension spring 6, one end of which is hinged to the second hinge part 4112, and the other end is hinged to the third hinge part.

[0082] The tension spring 6 proposed in this embodiment causes the free end of the locking member 471 to tend to deflect towards the straight groove 4110 through elastic tension, thereby keeping the locking groove 4711 engaged with the exposed end of the locking pin 46. When the piston rod 2 slides and the locking pin 46 moves to the engaging position, the tension spring 6 drives the locking member 471 to rotate automatically, and the locking groove 4711 engages with the exposed end of the locking pin 46, restricting the locking pin 46 from sliding along the straight groove 4110, realizing the relative fixed state between the piston rod 2 and the drive cylinder 1, and locking the current position of the hydraulic opening and closing mechanism. When unlocking, the user overcomes the tension of the tension spring 6 and moves the free end of the locking member 471, causing the locking member 471 to rotate in the opposite direction, and the locking groove 4711 disengages from the exposed end of the locking pin 46. At this time, the locking pin 46 can slide freely in the straight groove 4110, so that the piston rod 2 can move relative to the drive cylinder 1, which is convenient for adjustment.

[0083] Furthermore, in some embodiments, the locking pin 46 is a telescopic structure, and the end of the locking groove 4711 is provided with a guide slope 4712. The guide slope 4712 can abut against the exposed end of the locking pin 46. The guide slope 4712 is used to abut against the exposed end of the locking pin 46 along the trend of compressing the locking pin 46 when the free end of the locking member 471 is moved by external force.

[0084] Based on the structure of locking pin 46 and locking groove 4711, the control device of this application has a telescopic structure for locking pin 46 and a guide slope 4712 at the end of locking groove 4711. The guide slope 4712 can abut against the exposed end of locking pin 46 and abut against the exposed end along the trend of compressing locking pin 46 when the free end of locking member 471 is driven by external force.

[0085] When the user applies an external force to drive the free end of the locking member 471 to move in the snap-fit ​​direction, the guide slope 4712 of the snap-fit ​​groove 4711 first contacts the exposed end of the locking pin 46. Due to the inclined structure of the guide slope 4712, its contact with the exposed end generates a compressive component force along the axial direction of the locking pin 46, causing the telescopic structure of the locking pin 46 to be compressed and shortened. As the locking member 471 continues to move, the compressed locking pin 46 slides along the guide slope 4712 at the exposed end and then disengages from the snap-fit ​​groove 4711. The locking pin 46 can slide along the straight groove 4110, allowing the slide plate 45 to slide freely, thus realizing the relatively movable state of the piston rod 2 and the drive cylinder 1.

[0086] Please refer to Figures 14 to 16 In another preferred embodiment, a locking step 200 is recessed on the peripheral wall of the other end of the piston rod 2; the locking mechanism 4 includes: The clamp component 49 includes a connecting plate 491 and claws 492 disposed on both sides of the connecting plate 491. The connecting plate 491 is used to connect with the drive cylinder 1. The two claws 492 can move towards or away from each other. When the two pawls 492 engage with the locking step 200, the piston rod 2 and the drive cylinder 1 are in a relatively fixed state; when the two pawls 492 separate from the locking platform, the piston rod 2 and the drive cylinder 1 are in a relatively movable state.

[0087] The control device of this application is based on the structure in which both ends of the piston rod 2 are exposed to the drive cylinder 1, and the other end of the piston rod 2 is provided with a locking step 200. The locking mechanism 4 includes a clamp 49, which includes a connecting plate 491 and claws 492 disposed on both sides of the connecting plate 491. The connecting plate 491 is used to connect with the drive cylinder 1, and the two claws 492 can move towards or away from each other.

[0088] When the two jaws 492 move toward each other and engage with the locking step 200, the jaws 492 engage in the groove of the locking step 200, restricting the axial sliding of the piston rod 2, thereby making the piston rod 2 and the drive cylinder 1 relatively fixed, locking the current position of the hydraulic opening and closing mechanism; when the two jaws 492 move away from each other and separate from the locking step 200, the jaws 492 disengage from the groove of the locking step 200, allowing the piston rod 2 to slide axially relative to the drive cylinder 1. The user can adjust one end of the piston rod 2 by operating the handle 3 to achieve a relatively movable state between the piston rod 2 and the drive cylinder 1.

[0089] Please continue to refer to Figures 14 to 16 In some embodiments, the other end of the piston rod 2 is provided with a tapered portion 201, and a locking step 200 is provided adjacent to the tapered portion 201. The tapered portion can push open the two claws 492 so that the two claws 492 move in opposite directions.

[0090] Based on the structure of clamp 49 and locking step 200, the control device of this application has a tapered part 201 at the other end of the piston rod 2. The locking step 200 is arranged adjacent to the tapered part 201. The tapered part 201 can squeeze open the two claws 492, so that the two claws 492 move in opposite directions.

[0091] In the unlocked state, the two jaws 492 are separated in opposite directions, and the piston rod 2 can slide relative to the drive cylinder 1. When the user drives the piston rod 2 in the locking direction (with the conical part 201 facing the jaws 492) via the operating handle 3, the conical part 201 first enters between the two jaws 492, its conical surface abuts against the inner side of the jaws 492 and gradually pushes the two jaws 492 apart, causing the two jaws 492 to move in opposite directions until the conical part 201 passes through. Then, the two jaws 492 are released by elastic restoring force or external driving. The piston rod 2 moves downwards and engages in the groove of the adjacent locking step 200. At this time, the pawl 492 restricts the axial movement of the locking step 200, realizing the relative fixed state of the piston rod 2 and the drive cylinder 1, locking the current position of the hydraulic opening and closing mechanism. When unlocking, the user drives the piston rod 2 in the opposite direction, and the side wall of the locking step 200 squeezes the pawl 492 to make it move away from the groove. Then the tapered part 201 assists again in maintaining the separation channel, so that the piston rod 2 can pass smoothly and return to the relatively movable state.

[0092] Please continue to refer to Figures 14 to 16 In some embodiments, the control device further includes an expansion sleeve 7, which is slidably fitted on the outside of the clamp 49. The expansion sleeve 7 has a cone 71 that can extend between the two jaws 492. The expansion sleeve 7 is used to be driven by an external force so that the cone 71 drives the two jaws 492 to move in opposite directions.

[0093] The control device proposed in this application, based on the structure of the clamp 49, also includes an expansion sleeve 7. The expansion sleeve 7 is slidably sleeved on the outside of the clamp 49 and has a cone 71 that can extend between the two claws 492. The expansion sleeve 7 is used to be driven by external force so that the cone 71 drives the two claws 492 to move in opposite directions.

[0094] In the locked state, the two claws 492 engage with the locking step 200, fixing the piston rod 2 and the drive cylinder 1 relative to each other. When unlocking, the user applies external force to drive the expansion sleeve 7 to slide axially, causing the cone 71 to extend between the two claws 492. The conical surface of the cone 71 abuts against the inner side of the claws 492 and gradually squeezes the two claws 492 to move in opposite directions, thereby forcing the two claws 492 to disengage from the groove of the locking step 200. At this time, the piston rod 2 can slide relative to the drive cylinder 1. The user can drive the piston rod 2 to adjust the hydraulic opening and closing mechanism through the operating handle 3 to achieve a relatively movable state. When the external force is released, the expansion sleeve 7 retracts, and the claws 492 move towards each other under the elastic restoring force, ready for the next locking.

[0095] Please continue to refer to Figures 14 to 16 In some embodiments, the control device includes a hollow mounting sleeve 8, one end of which is connected to the drive cylinder 1, and the other end is an open end into which the cone 71 can extend; the mounting sleeve 8 is fitted on the outside of the clamp 49. The expansion sleeve 7 is recessed with a mounting groove 72, which is sleeved on the outside of the mounting sleeve. The bottom wall of the mounting groove 72 is constructed with a truncated cone 71.

[0096] The control device proposed in this application embodiment also includes a hollow mounting sleeve 8. One end of the mounting sleeve 8 is connected to the drive cylinder 1, and the other end is an open end into which the cone 71 can extend. The mounting sleeve 8 is fitted on the outside of the clamp 49. The expansion sleeve 7 is recessed with a mounting groove 72, which is fitted on the outside of the mounting sleeve 8. The bottom wall of the mounting groove 72 is constructed with a cone 71.

[0097] The expansion sleeve 7 is slidably fitted onto the outside of the mounting sleeve 8 through the mounting groove 72. The hollow structure of the mounting sleeve 8 provides a channel for the cone 71 to extend into the clamp 49. When unlocking, the user applies external force to drive the expansion sleeve 7 to slide along the mounting sleeve 8 toward the open end. The bottom wall of the mounting groove 72 drives the cone 71 to extend between the two jaws 492 through the open end. The conical surface of the cone 71 presses against the inner side of the jaws 492, causing the two jaws 492 to move in opposite directions and disengage from the locking step 200. At this time, the piston rod 2 can slide relative to the driving cylinder 1, achieving a relatively movable state, which facilitates the adjustment of the hydraulic opening and closing mechanism. After locking preparation or release of external force, the expansion sleeve 7 slides in the opposite direction along the mounting sleeve 8, the cone 71 exits between the jaws 492, and the two jaws 492 return to their original positions and are ready to engage with the locking step 200.

[0098] Please continue to refer to Figures 14 to 16In some embodiments, the control device further includes an elastic reset member 9, one end of which abuts against the bottom wall of the mounting groove 72, and the other end abuts against the end of the mounting sleeve 8 away from the drive cylinder 1. The elastic reset member 9 is used to drive the expansion sleeve 7 to move away from the mounting sleeve 8, so that the cone 71 moves away from the clamp member 49.

[0099] The control device proposed in this application embodiment also includes an elastic reset member 9. One end of the elastic reset member 9 abuts against the bottom wall of the mounting groove 72, and the other end abuts against the end of the mounting sleeve 8 away from the drive cylinder 1. The elastic reset member 9 is used to drive the expansion sleeve 7 to move in a direction away from the mounting sleeve 8, so that the cone 71 moves in a direction away from the clamp member 49.

[0100] During the unlocking operation, the user applies external force to drive the expansion sleeve 7 to slide along the mounting sleeve 8 towards the drive cylinder 1, overcoming the elastic force of the elastic reset member 9. The bottom wall of the mounting groove 72 compresses the elastic reset member 9, while the cone 71 extends between the two claws 492, squeezing the claws 492 apart, causing the claws 492 to disengage from the locking step 200, thus achieving a relatively movable state between the piston rod 2 and the drive cylinder 1. When the user releases the external force, the elastic restoring force of the elastic reset member 9 pushes the bottom wall of the mounting groove 72, causing the expansion sleeve 7 to automatically reset and slide away from the mounting sleeve 8. The cone 71 then exits between the two claws 492, and the two claws 492 return to their original positions and prepare to engage the locking step 200 again, ensuring readiness for the next locking action.

[0101] Furthermore, this application proposes a photographic support device comprising: The support leg is equipped with a hydraulic opening and closing mechanism, which is used to control the movement of the support leg. The control device described in the foregoing embodiments is used to control the hydraulic opening and closing mechanism.

[0102] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A control device for a photographic support device, the photographic support device comprising a support leg, the support leg being provided with a hydraulic opening and closing mechanism, the hydraulic opening and closing mechanism being used to control the movement of the support leg, and the control device being used to control the hydraulic opening and closing mechanism, characterized in that, The control device includes: A drive cylinder is connected to the hydraulic opening and closing mechanism; A piston rod, which is movably and slidably disposed within the drive cylinder, and at least one end of the piston rod is exposed outside the drive cylinder; An operating handle is connected to one end of the piston rod exposed in the drive cylinder body, and the operating handle is used to drive the piston rod to move relative to the drive cylinder body; A locking mechanism is provided, which acts on the exposed end of the piston rod to make the piston rod and the drive cylinder relatively fixed or relatively movable.

2. The control device for the photographic support device according to claim 1, characterized in that, One end of the operating handle is rotatably connected to the drive cylinder, and the other end is a free end; The locking mechanism includes a linkage assembly, one end of which is hinged to the operating handle, and the other end of which is hinged to the end of the piston rod exposed in the drive cylinder. The connecting rod assembly has a dead point position. When the connecting rod assembly is in the dead point position, the piston rod and the drive cylinder are in a relatively fixed state. When the connecting rod assembly passes the dead point position, the piston rod and the drive cylinder are in a relatively movable state.

3. The control device for the photographic support device according to claim 2, characterized in that, The drive cylinder is provided with a rotating connection part, which is spaced apart on one side of the exposed end of the piston rod, and one end of the operating handle is hinged to the rotating connection part; The portion of the operating handle located between the free end and the hinged end is hinged to one end of the connecting rod assembly.

4. The control device for the photographic support device according to claim 2 or 3, characterized in that, The linkage assembly includes: A first link, one end of which is connected to the operating handle; The second connecting rod has one end hinged to the other end of the first connecting rod, and the other end of the second connecting rod is hinged to one end of the piston rod exposed outside the drive cylinder. Specifically, when the second connecting rod and the piston rod are collinear, the connecting rod assembly is in a dead position.

5. The control device for the photographic support device according to claim 1, characterized in that, The control device also includes a seal located inside the drive cylinder, and the other end of the piston rod passes through the seal and is connected to the locking mechanism.

6. The control device for the photographic support device according to claim 5, characterized in that, The locking mechanism includes: A limiting cylinder, one end of which is connected to the drive cylinder body, has a sliding cavity, and the other end of the piston rod passes through the sliding cavity; the cavity wall of the sliding cavity is provided with guide portions and blocking portions at intervals. A rotating sleeve is rotatably disposed at the other end of the piston rod. The peripheral wall of the rotating sleeve is provided with a mating part that can slide with the guide part. The rotating sleeve can be driven by an external force to turn the mating part toward the guide part or to turn the mating part toward the blocking part.

7. The control device for the photographic support device according to claim 6, characterized in that, The guide portion is a guide rib protruding from the cavity wall, and the blocking portion is a limiting notch constructed at the end of the guide rib away from the drive cylinder body. The guide portion is a groove between two adjacent guide ribs; The mating part is the sliding rib protruding from the rotating sleeve.

8. The control device for the photographic support apparatus according to claim 6 or 7, characterized in that, The control device further includes an unlocking mechanism disposed on the limiting cylinder. The unlocking mechanism can drive the rotating sleeve to move so that the mating part turns towards the guide part, or so that the mating part turns towards the blocking part.

9. The control device for the photographic support device according to claim 8, characterized in that, The unlocking mechanism includes a steering seat, which is disposed at one end of the limiting cylinder away from the drive cylinder body, and is provided with a steering gear ring that can extend into the sliding cavity. The steering gear ring includes a plurality of continuous guide teeth; each guide tooth has a guide slope. The sliding rib has a sliding inclined surface at one end facing the steering seat, and the sliding inclined surface can slide along the guide inclined surface.

10. The control device for the photographic support device according to claim 5, characterized in that, The locking mechanism includes: A fixed base is connected to the drive cylinder body, and the fixed base is provided with two vertical plates spaced apart. A sliding plate is connected to the other end of the piston rod, and the sliding plate can slide between the two upright plates; A locking pin is provided on one of the upright plate and the sliding plate; A locking structure is provided on the other of the upright plate and the sliding plate, the locking structure being detachably engaged with the locking pin; When the locking pin engages with the locking structure, the piston rod and the drive cylinder are in a relatively fixed state; when the locking pin is separated from the locking structure, the piston rod and the drive cylinder are in a relatively movable state.

11. The control device for the photographic support apparatus according to claim 10, characterized in that, The control device also includes a swing rod, one end of which is swayably connected to the upright plate, and the other end is provided with the locking pin; The locking structure includes a guide rail constructed on the slide plate, the guide rail being slidably inserted into which the locking pin extends, the guide rail having a dead point position; When the locking pin is at the dead point of the guide slide, the piston rod and the drive cylinder are in a relatively fixed state; when the locking pin is disengaged from the dead point of the guide slide, the piston rod and the drive cylinder are in a movable state.

12. The control device for the photographic support apparatus according to claim 11, characterized in that, The guide slide includes a heart-shaped slide and a straight slide communicating with the heart-shaped slide; wherein: The heart-shaped slide includes a first connecting section and a second connecting section, the first end of the first connecting section is connected to the end of the second connecting section, and the dead point is located between the first end of the first connecting section and the end of the second connecting section; The straight slide connects the end of the first connecting section to the beginning of the second connecting section.

13. The control device for the photographic support apparatus according to claim 10, characterized in that, The upright plate has a straight groove, and the locking pin is disposed on the sliding plate and is slidably inserted through the straight groove; The locking structure includes a locking member, which is movably disposed on the upright plate, and the locking member has a snap-fit ​​groove adapted to the locking pin; When the locking pin engages with the locking groove, the piston rod and the drive cylinder are in a relatively fixed state; when the locking pin disengages from the locking groove, the piston rod and the drive cylinder are in a movable state.

14. The control device for the photographic support device according to claim 13, characterized in that, The locking pin is exposed at one end away from the slide plate in the straight groove; One end of the locking member is hinged to the upright plate, and the other end is a free end. A snap-fit ​​groove is constructed between the hinged end and the free end of the locking member, and the snap-fit ​​groove can snap into the exposed end of the locking pin.

15. The control device for the photographic support apparatus according to claim 14, characterized in that, The vertical plate is provided with a first hinge portion and a second hinge portion, which are located on both sides of the straight groove. One end of the locking member is hinged to the first hinge portion, and the free end of the locking member is provided with a third hinge portion; The control device further includes a tension spring, one end of which is hinged to the second hinge portion, and the other end of which is hinged to the third hinge portion.

16. The control device for the photographic support apparatus according to claim 14 or 15, characterized in that, The locking pin is a telescopic structure, and the end of the locking groove is provided with a guide slope. The guide slope can abut against the exposed end of the locking pin. The guide slope is used to abut against the exposed end of the locking pin in the direction of compressing the locking pin when the free end of the locking member is driven to move by an external force.

17. The control device for the photographic support device according to claim 5, characterized in that, The piston rod has a locking step recessed on its peripheral wall at the other end; the locking mechanism includes: The clamp component includes a connecting plate and clamping claws disposed on both sides of the connecting plate. The connecting plate is used to connect with the drive cylinder body. The two clamping claws can move towards or away from each other. When the two claws engage with the locking step, the piston rod and the drive cylinder are in a relatively fixed state; when the two claws separate from the locking platform, the piston rod and the drive cylinder are in a relatively movable state.

18. The control device for the photographic support apparatus according to claim 17, characterized in that, The other end of the piston rod is provided with a tapered portion, and the locking step is provided adjacent to the tapered portion. The tapered portion can push open the two jaws so that the two jaws can move in opposite directions.

19. The control device for the photographic support apparatus according to claim 17 or 18, characterized in that, The control device further includes an expansion sleeve, which is slidably fitted onto the outside of the clamp. The expansion sleeve has a truncated cone that can extend between the two jaws. The expansion sleeve is used to be driven by an external force so that the truncated cone drives the two jaws to move in opposite directions.

20. The control device for the photographic support apparatus according to claim 19, characterized in that, The control device includes a hollow mounting sleeve, one end of which is connected to the drive cylinder, and the other end is an open end into which the cone can extend; the mounting sleeve is fitted onto the outside of the clamp. The expansion sleeve is recessed with a mounting groove, which is fitted onto the outside of the mounting sleeve. The bottom wall of the mounting groove is formed with a truncated cone.

21. The control device for the photographic support apparatus according to claim 20, characterized in that, The control device further includes an elastic reset member, one end of which abuts against the bottom wall of the mounting groove, and the other end of which abuts against the end of the mounting sleeve away from the drive cylinder. The elastic reset member is used to drive the expansion sleeve to move in a direction away from the mounting sleeve, so that the cone moves in a direction away from the clamp.

22. A photographic support device, characterized in that, include: The support leg is equipped with a hydraulic opening and closing mechanism, which is used to control the movement of the support leg. The control device according to any one of claims 1-19, wherein the control device is used to control the hydraulic opening and closing mechanism.

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