Control handle of photography support frame and photography support frame

Abstract

The invention discloses a control handle of a photography support frame, which is used for unlocking or locking a support leg locking assembly of the photography support frame, and comprises a handle shell, a support leg locking assembly, a support leg locking assembly and a support leg locking assembly, the hydraulic cylinder is arranged in the handle shell, the hydraulic cylinder comprises a cylinder body and a first piston, the cylinder body is provided with a hydraulic cavity for storing hydraulic fluid and an overflowing hole which is communicated with the hydraulic cavity and can allow the hydraulic fluid to enter and exit from the hydraulic cavity, and the overflowing hole is used for being communicated with the supporting leg locking assembly; the first piston is arranged in the hydraulic cavity in a sliding mode and used for squeezing out hydraulic fluid in the hydraulic cavity from the overflowing hole or pumping the hydraulic fluid back to the hydraulic cavity. The hydraulic handle is adopted as the control handle, and compared with an existing electric control handle, charging is not needed, so that equipment such as a charger and a mobile power source does not need to be additionally carried, the carrying burden is reduced, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of photographic support frames, and in particular to a control handle of a photographic support frame and a photographic support frame. Background Art

[0002] As a very important auxiliary equipment in the photography process, the photography support stand can provide stable support for the camera, effectively eliminate the shaking caused by hand-held camera, and greatly improve the clarity and sharpness of the photos.

[0003] The photography support stand is usually equipped with a control handle, and the user can operate the control handle to lock and unlock the telescopic adjustment function of the support legs of the photography support stand. In the locked state, the support legs cannot be telescoped; in the unlocked state, the user can operate the support legs to telescope to adjust their support height.

[0004] In the related art, the control handle is an electric control handle, which controls the locking or unlocking of the support leg locking assembly by sending a control signal to the support leg locking assembly. However, when used for a long time in scenes such as outdoors, the handle is easily exhausted, so it is necessary to carry additional equipment such as chargers and mobile power supplies, which increases the burden of carrying and is inconvenient to use. Summary of the invention

[0005] The main purpose of the present invention is to provide a control handle for a photographic support frame, aiming to solve the technical problem that the control handle for a photographic support frame is inconvenient to use.

[0006] To achieve the above-mentioned object, the present invention provides a control handle of a photography support stand, which is used to unlock or lock a support leg locking assembly of the photography support stand, wherein the control handle comprises:

[0007] Handle shell;

[0008] A hydraulic cylinder is arranged in the handle shell, and the hydraulic cylinder includes a cylinder body and a first piston. The cylinder body is provided with a hydraulic chamber for storing hydraulic fluid and a flow hole connected with the hydraulic chamber and allowing the hydraulic fluid to enter and exit the hydraulic chamber. The flow hole is used to communicate with the support foot locking assembly. The first piston is slidably arranged in the hydraulic chamber, and is used to squeeze the hydraulic fluid in the hydraulic chamber from the flow hole or to draw the hydraulic fluid back to the hydraulic chamber.

[0009] In some embodiments, the first piston includes a first piston plate and a first piston rod protruding from a side surface of the first piston plate, and the first piston plate is slidably matched with the cavity wall of the hydraulic cavity.

[0010] In some embodiments, the cylinder body is provided with a first slideway extending along its axial direction, one end of the first slideway is connected to the hydraulic chamber, the other end of the first slideway is provided with an opening, and the first piston rod passes through the first slideway and passes out of the cylinder body through the opening;

[0011] A first gap is formed between the first piston rod and the inner wall of the first slideway for hydraulic fluid to pass through. The cylinder body is also provided with a first flow port, which passes through the inner wall of the first slideway and is connected to the first slideway. A liquid storage tank is provided in the handle shell, and the liquid storage tank is connected to the first flow port.

[0012] In some embodiments, a first sealing ring is sleeved on the outer wall of the first piston rod, and the first sealing ring can move with the first piston rod, enter the first slideway from the hydraulic chamber to seal the first gap, or enter the hydraulic chamber from the first slideway to cancel the seal of the first gap.

[0013] In some embodiments, the control handle further comprises:

[0014] a pressure relief chamber for containing hydraulic fluid;

[0015] The first piston is provided with a pressure relief hole, the hydraulic chamber is connected with the pressure relief chamber through the pressure relief hole, a first reset member and a slidable second piston are provided in the pressure relief chamber, and the first reset member acts on the second piston to apply a force to the second piston to reset it.

[0016] In some embodiments, the first piston includes a first piston plate and a first piston rod extending from a side surface of the first piston plate, and the first piston plate is slidably matched with the cavity wall of the hydraulic cavity;

[0017] Wherein, the pressure relief chamber is constructed on the first piston disk.

[0018] In some embodiments, the second piston includes a second piston disc and a second piston rod protruding from a side surface of the second piston disc, and the second piston disc is slidably matched with the cavity wall of the pressure relief cavity;

[0019] The first return member is a first return spring, one end of the first return spring abuts against the cavity wall of the pressure relief cavity, and the other end of the first return spring abuts against the second piston disc.

[0020] In some embodiments, the second piston is inverted in the pressure relief chamber, the second piston rod faces opposite to the first piston rod, and the second piston rod is arranged to pass through the first piston plate, and the first return spring is sleeved on the second piston rod;

[0021] The pressure relief hole is constructed on the first piston rod. The first piston rod is provided with a pressure relief channel. The pressure relief hole is communicated with the pressure relief chamber through the pressure relief channel.

[0022] In some embodiments, the control handle further comprises:

[0023] a wrench, located at the peripheral side of the handle shell, one end of the wrench is hinged to the handle shell and is provided with a top piece, the top piece is provided in the handle shell and acts on one end of the first piston rod away from the first piston disc, the wrench can be rotated to drive the top piece to act on the first piston rod, so as to drive the first piston to move;

[0024] The second restoring member is disposed in the hydraulic chamber, and acts on the first piston disc to apply a force to the first piston disc to restore the first piston.

[0025] In some embodiments, the control handle further comprises:

[0026] A knob rotatably disposed at one end of the wrench;

[0027] A holding block, located on a side of the wrench facing the handle housing and connected to the knob;

[0028] a first torsion spring, disposed between the wrench and the knob, the first torsion spring being used to apply a force to the knob to reset it;

[0029] a second torsion spring, disposed between the wrench and the handle housing, the second torsion spring being used to apply a force to the wrench to reset it;

[0030] Among them, one end of the top piece is hinged to the wrench and the handle shell through a hinge shaft, and the other end acts on the first piston rod. The top piece is provided with a supporting surface and a receiving opening arranged adjacent to each other along the axial direction of the hinge shaft. The supporting block can move with the rotation of the knob to a first position where it can be supported by the supporting surface or a second position where it can be received in the receiving opening.

[0031] The present invention further provides a control handle of a photography support stand, which is used to unlock or lock a support leg locking assembly of the photography support stand, wherein the control handle comprises:

[0032] Handle shell;

[0033] A hydraulic cylinder is arranged in the handle shell, the hydraulic cylinder comprises a cylinder body and a first piston, the cylinder body is provided with a hydraulic chamber for storing hydraulic fluid and a flow hole communicating with the hydraulic chamber and allowing the hydraulic fluid to enter and exit the hydraulic chamber, the flow hole is used to communicate with the support foot locking assembly, the first piston is slidably arranged in the hydraulic chamber, and is used to squeeze the hydraulic fluid in the hydraulic chamber from the flow hole or to draw the hydraulic fluid back to the hydraulic chamber;

[0034] Among them, the first piston is provided with a pressure relief chamber for accommodating hydraulic fluid and a pressure relief hole connecting the pressure relief chamber with the hydraulic chamber and allowing the hydraulic fluid to pass through. A first reset member and a slidable second piston are provided in the pressure relief chamber. The first reset member acts on the second piston to apply a force to the second piston to reset it.

[0035] In some embodiments, the first piston includes a first piston plate and a first piston rod extending from a side surface of the first piston plate, and the first piston plate is slidably matched with the cavity wall of the hydraulic cavity;

[0036] Wherein, the pressure relief chamber is at least partially constructed on the first piston disk.

[0037] In some embodiments, the second piston includes a second piston disc and a second piston rod protruding from a side surface of the second piston disc, and the second piston disc is slidably matched with the cavity wall of the pressure relief cavity;

[0038] The first return member is a first return spring, one end of which abuts against the cavity wall of the pressure relief cavity, and the other end of which abuts against the second piston disc.

[0039] In some embodiments, the cylinder body is further provided with a first slideway extending along its axial direction, one end of the first slideway is connected to the hydraulic chamber, the other end of the first slideway is provided with an opening, and the first piston rod passes through the first slideway and passes out of the cylinder body through the opening;

[0040] A first gap is formed between the first piston rod and the inner wall of the first slideway for hydraulic fluid to pass through. The cylinder body is also provided with a first flow port, which passes through the inner wall of the first slideway and is connected to the first slideway. A liquid storage tank is provided in the handle shell, and the liquid storage tank is connected to the first flow port.

[0041] In some embodiments, the second piston is mounted on the pressure relief chamber, the second piston rod and the first piston rod have the same orientation, and the first return spring is located on a side of the second piston disc away from the second piston rod;

[0042] The first piston rod is provided with a second slideway extending along its axial direction, one end of the second slideway is butted with the pressure relief chamber, and the second piston rod penetrates into the second slideway and slides in cooperation with the second slideway;

[0043] The pressure relief chamber at least partially extends into the first piston rod, and the pressure relief hole is constructed on the first piston rod and is arranged through the inner wall of the pressure relief chamber.

[0044] In some embodiments, the first piston rod is further provided with a flow passage extending along its axial direction, and the flow passage is located at the other end of the second slideway and communicates with the second slideway;

[0045] A second gap through which hydraulic fluid can pass is formed between the second piston rod and the inner wall of the second slideway. The first piston rod is also provided with a second flow port, which penetrates the inner wall of the flow channel and is connected to the flow channel.

[0046] In some embodiments, a second sealing ring is provided on the outer wall of the second piston rod, and the second sealing ring can move with the second piston rod, enter the second slide channel from the pressure relief chamber to seal the second gap, or enter the pressure relief chamber from the second slide channel to cancel the seal of the second gap.

[0047] In some embodiments, a third sealing ring is embedded in the inner wall of the first slideway, and the third sealing ring is arranged adjacent to an end of the first slideway that interfaces with the hydraulic chamber and is used to abut against the first piston rod.

[0048] The present invention also provides a photographic support frame, which comprises:

[0049] A receiving seat for mounting photographic equipment;

[0050] A plurality of support legs with telescopic adjustment function, connected to the receiving seat and used to support the receiving seat, each of the support legs correspondingly provided with a support leg locking assembly;

[0051] The control handle of the aforementioned photographic support stand is arranged on the receiving seat, and the control handle is used to unlock or lock the support leg locking assembly.

[0052] The control handle of the technical solution of the present invention is applied to a photographic support frame, and is used to control the locking or unlocking of the support leg locking assembly of the photographic support frame. The flow hole on the cylinder body of the hydraulic cylinder in the control handle can be connected to the support leg locking assembly, and the first piston slides in the hydraulic cavity, and the hydraulic fluid is output from the flow hole or the hydraulic fluid is withdrawn to transmit the locking assembly of the support leg to perform the unlocking action or locking action accordingly. For example, during the unlocking process, by driving the first piston of the hydraulic cylinder to move to squeeze the hydraulic fluid in the hydraulic cavity to flow out from the flow hole to the support leg locking assembly, the supporting leg locking assembly, under the pressure of the hydraulic fluid, performs the unlocking action correspondingly by its components, thereby achieving unlocking; during the locking process, by driving the first piston of the hydraulic cylinder to move to withdraw the hydraulic fluid at the support leg locking assembly from the flow hole to the hydraulic cavity, due to the reduction of the pressure of the hydraulic fluid, the components of the supporting leg locking assembly perform the locking action (such as resetting by the elastic member), thereby achieving locking. That is, the control handle of the present invention adopts a hydraulic handle, which does not need to be charged compared to the existing electric control handle, so there is no need to carry additional chargers, mobile power supplies and other equipment, which reduces the burden of carrying and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of a photographic support frame in one embodiment of the present invention;

[0054] Figure 2 for Figure 1 A schematic structural diagram of a portion of a photographic support frame in an embodiment;

[0055] Figure 3 This is a schematic diagram of the internal structure of a control handle in one embodiment of the present invention;

[0056] Figure 4 This is a schematic diagram of the structure of a part of a control handle in one embodiment of the present invention;

[0057] Figure 5 This is a schematic structural diagram of another part of the control handle in one embodiment of the present invention;

[0058] Figure 6 for Figure 5 A schematic diagram of the internal structure of another part of the control handle in the embodiment;

[0059] Figure 7 This is a schematic structural diagram of another part of the control handle in one embodiment of the present invention;

[0060] Figure 8 for Figure 7 A schematic diagram of the internal structure of another part of the control handle in the embodiment;

[0061] Fig. 9 This is a schematic diagram of the internal structure of a control handle in another embodiment of the present invention;

[0062] Fig.10 for Fig. 9 An exploded view of a portion of the structure of the control handle in the embodiment;

[0063] Fig.11 for Fig. 9 An exploded view of a portion of the structure of the control handle in an embodiment. DETAILED DESCRIPTION

[0064] The scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0066] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0067] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] Reference Figure 1 As a tool used to support photographic equipment such as cameras and camcorders, a photography support stand can help users keep the equipment stable when shooting, thereby obtaining clearer and more accurate photos and videos.

[0069] The embodiment of the present invention provides a control handle 100 of a photographic support stand, and the control handle 100 is used to lock and unlock a support leg locking assembly of the photographic support stand.

[0070] Reference Figures 2 to 4 The control handle 100 of the photography support frame includes:

[0071] Handle housing 110;

[0072] The hydraulic cylinder 120 is arranged in the handle shell 110. The hydraulic cylinder 120 includes a cylinder body 121 and a first piston 122. The cylinder body 121 is provided with a hydraulic chamber 121Y for storing hydraulic fluid and a flow hole 121G which is connected to the hydraulic chamber 121Y and allows the hydraulic fluid to enter and exit the hydraulic chamber 121Y. The flow hole 121G is used to communicate with the support foot locking assembly. The first piston 122 is slidably arranged in the hydraulic chamber 121Y, and is used to squeeze the hydraulic fluid in the hydraulic chamber 121Y from the flow hole 121G or to draw the hydraulic fluid back to the hydraulic chamber 121Y.

[0073] The control handle 100 involved in this embodiment, as a component of the photographic support frame, can be linked with the support leg locking assembly of the photographic support frame to lock or unlock the support leg locking assembly of the photographic support frame, that is, the user can operate the control handle 100 to lock the support leg locking assembly, and in the locked state, the support leg cannot be extended or retracted; or, the user can unlock the support leg locking assembly, and in the unlocked state, the user can operate the support leg to extend or retract to adjust its support height, and lock it again after the adjustment.

[0074] Specifically, the photography support frame may include a receiving seat 200 and a plurality of supporting legs 300 connected to the receiving seat 200 and used to support the receiving seat 200. The receiving seat 200 is used to install photographic equipment, such as a camera, etc. The supporting leg locking assembly is correspondingly arranged at the supporting leg 300, and is used to clamp or release the supporting leg 300. The control handle 100 may be installed on the receiving seat 200, and correspondingly forms a linkage arrangement with the supporting leg locking assembly.

[0075] In the control handle 100, as Figure 2 As shown, the handle shell 110 may be in the shape of a long cylinder, which is convenient for the user to hold. The handle shell 110 is internally structured with a storage space, which may accommodate components such as the hydraulic cylinder 120, including but not limited to the above. The handle shell 110 may include a first half shell and a second half shell, and the first half shell and the second half shell are butt-jointed to enclose and form a storage space. In addition, the first half shell and the second half shell are detachably connected, and the detachable connection method may be a screw connection, a snap connection, etc.

[0076] The hydraulic cylinder 120 can slide in the hydraulic chamber 121Y of the cylinder body 121 through its first piston 122, and the hydraulic fluid can be squeezed outward or drawn inward from the position of the flow hole 121G. The sliding direction of the first piston 122 can be a first direction F1 or a second direction F2 along the axial direction of the cylinder body 121, and the first direction F1 is opposite to the second direction F2. The flow hole 121G can be set on the end surface of one end of the cylinder body 121, and the flow hole 121G passes through the cylinder body 121 and is connected to the hydraulic chamber 121Y. The hydraulic fluid can be hydraulic oil. Figure 3 As shown, when the first piston 122 slides toward the first direction F1, the storage volume of the hydraulic chamber 121Y storing the hydraulic fluid gradually decreases to correspond to the hydraulic fluid being squeezed out of the flow hole 121G; when the first piston 122 slides toward the second direction F2, the storage volume of the hydraulic chamber 121Y storing the hydraulic fluid gradually expands to correspond to the hydraulic fluid being drawn in through the flow hole 121G.

[0077] The flow hole 121G on the cylinder body 121 of the hydraulic cylinder 120 in the control handle can be connected to the support foot locking assembly, and the first piston 122 slides in the hydraulic chamber 121Y, and the hydraulic fluid is output from the flow hole 121G or withdrawn to drive the support foot locking assembly to perform the unlocking action or locking action accordingly. Among them, the first liquid pipe can be connected between the flow hole 121G and the locking assembly of the support foot, and the hydraulic fluid is transported through the first liquid pipe.

[0078] During the unlocking process, the first piston 122 of the hydraulic cylinder 120 is driven to move to squeeze the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the support leg locking assembly. Under the pressure of the hydraulic fluid, the components of the support leg locking assembly correspondingly perform the unlocking action, thereby achieving unlocking;

[0079] During the locking process, the first piston 122 is driven to move so as to draw the hydraulic fluid at the supporting foot locking assembly back to the hydraulic chamber 121Y from the flow hole 121G. As the pressure of the hydraulic fluid is reduced, the components of the supporting foot locking assembly correspondingly perform locking actions (such as resetting through elastic parts), thereby achieving locking.

[0080] Correspondingly, the support foot locking assembly may include an oil cylinder and an actuator, and the actuator is connected to the piston of the oil cylinder in a transmission manner to clamp or release the support foot. The flow hole 121G of the hydraulic cylinder 120 is connected to the oil cylinder, and the hydraulic cylinder 120 can deliver hydraulic fluid to the oil cylinder or withdraw hydraulic fluid from the oil cylinder to make the piston of the oil cylinder move, thereby transmitting the actuator, so that the actuator clamps the support foot to switch the support foot to a non-retractable locked state or releases the support foot to switch the support foot to a retractable unlocked state. This is only exemplary and not restrictive.

[0081] The control handle may be provided with an unlocking component for controlling the sliding of the first piston 122 of the hydraulic cylinder 120. The unlocking component may be a manual unlocking component, which is in transmission connection with the first piston 122 of the hydraulic cylinder 120. The user manually controls the manual unlocking component to drive the first piston 122 to slide, so as to unlock or lock. The manual unlocking component may be, for example, a wrench, a button, a sliding button, etc., which is not limited in this embodiment.

[0082] The control handle 100 of the present invention adopts a hydraulic handle. Compared with the existing electric control handle, it does not need to be charged, so there is no need to carry additional chargers, mobile power supplies and other equipment, which reduces the burden of carrying and is easy to use.

[0083] As a preferred embodiment, the control handle 100 can be linked with the support leg locking assemblies corresponding to each support leg. In this way, the user can unlock and lock multiple support leg locking assemblies at the same time by operating the control handle 100 with one button, without having to perform the unlocking operation one by one, which is easy to use.

[0084] In some embodiments, reference Figures 3 to 6 The first piston 122 includes a first piston disc 1221 and a first piston rod 1222 protruding from a side surface of the first piston disc 1221. The first piston disc 1221 is slidably matched with the cavity wall of the hydraulic cavity 121Y.

[0085] Specifically, the first piston disc 1221 and the first piston rod 1222 of the first piston 122 can be integrally formed, and the first piston rod 1222 is located on the central axis of the first piston disc 1221, and the first piston rod 1222 protrudes and extends on one side of the first piston disc 1221. The first piston disc 1221 and the first piston rod 1222 are in a follower relationship, and when either the first piston rod 1222 or the first piston disc 1221 moves under the action of an external force, the other will be driven to move accordingly. When the first piston disc 1221 slides along the wall of the hydraulic chamber 121Y, the storage volume of the hydraulic chamber 121Y can be correspondingly compressed or expanded.

[0086] Optionally, a first seal is sleeved on the outer wall of the first piston disc 1221. The first seal can slide with the first piston disc 1221 and abut against the cavity wall of the hydraulic cavity 121Y to achieve a liquid-leakage-proof seal. The first seal can be an elastic ring.

[0087] In the hydraulic system of the control handle 100, different characteristics are provided when used according to the type of hydraulic fluid selected. For example, when a hydraulic fluid such as hydraulic oil is selected, the hydraulic fluid has the characteristic of thermal expansion and contraction. However, when the user uses the photography support, the weather environment may be hot or cold, and the volume of the hydraulic oil in the hydraulic system of the control handle 100 is easily affected by the temperature and changes.

[0088] To ensure the stability of the hydraulic system of the control handle 100, in some embodiments, reference Figures 4 to 6 The cylinder body 121 is provided with a first slideway H1 extending along its axial direction, one end of the first slideway H1 is connected to the hydraulic chamber 121Y, and the other end of the first slideway H1 is provided with an opening, and the first piston rod 1222 passes through the first slideway and passes through the cylinder body 121 through the opening;

[0089] A first gap J1 is formed between the first piston rod 1222 and the inner wall of the first slide H1 for the hydraulic fluid to pass through. The cylinder body 121 is also provided with a first flow port G1, which passes through the inner wall of the first slide H1 and is connected to the first slide H1. A liquid storage tank 130 is provided in the handle shell 110, and the liquid storage tank 130 is connected to the first flow port G1.

[0090] When the ambient temperature is high, if the hydraulic oil expands due to the high temperature, the expanded hydraulic oil in the hydraulic chamber 121Y can enter the first slide H1, pass through the first gap J1 between the first piston rod 1222 and the inner wall of the first slide H1 and flow into the liquid storage tank 130 through the first flow port G1, and the expanded hydraulic oil is stored in the liquid storage tank 130 to release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120.

[0091] When the ambient temperature is low, if the hydraulic oil shrinks due to the low temperature, the hydraulic oil can flow back from the liquid storage tank 130 through the first flow port G1 and through the first gap J1 between the first piston rod 1222 and the inner wall of the first slideway H1 to the hydraulic chamber 121Y.

[0092] Among them, the first gap J1, the first flow port G1 and the liquid storage tank 130 constitute a pressure relief channel for the hydraulic oil in the hydraulic chamber 121Y, which can avoid damage to the seal and oil leakage caused by high-temperature expansion of the hydraulic oil in the hydraulic chamber 121Y, and prevent deformation or rupture of the cylinder body 121, so that the hydraulic system of the control handle 100 can adapt to the external ambient temperature and improve the applicability of the control handle 100.

[0093] Among them, Figure 4As shown, a liquid storage bag may be installed in the handle shell 110, and the hydraulic cylinder 120 and the oil storage bag are arranged in sequence along the axial direction of the handle shell 110, and the liquid storage bag is correspondingly configured as a liquid storage tank 130. The liquid storage bag is constructed with a plurality of expansion joints arranged at intervals along its axial direction. The liquid storage bag has a certain elastic deformation capacity and can automatically expand and contract with the change of the amount of hydraulic oil in the bag, thereby adapting to the increase or decrease of the amount of hydraulic oil. A second liquid pipe can be connected between the liquid storage bag and the first flow port G1 to transport hydraulic fluid through the second liquid pipe.

[0094] In some embodiments, reference Figure 6 The outer wall of the first piston rod 1222 is sleeved with a first sealing ring M1, and the first sealing ring M1 can move with the first piston rod 1222, and enter the first slideway H1 from the hydraulic chamber 121Y to seal the first gap J1, or enter the hydraulic chamber 121Y from the first slideway H1 to cancel the seal of the first gap J1. Optionally, the outer wall of the first piston rod 1222 is configured with a first annular groove, and when the first sealing ring M1 is sleeved on the first piston rod 1222, it is correspondingly accommodated in the first annular groove to achieve positioning installation.

[0095] The first sealing ring M1 is arranged to move with the first piston rod 1222. When the first piston 122 slides toward the first direction F1, the first sealing ring M1 can move with the first piston rod 1222 to enter the first slideway H1 from the hydraulic chamber 121Y, and automatically abuts against the inner wall of the first slideway H1 after entering the first slideway H1, thereby sealing the first gap J1, so that the hydraulic chamber 121Y and the first gap J1 are in an isolated state, that is, the hydraulic oil cannot flow between the hydraulic chamber 121Y and the first gap J1 through the barrier of the first sealing ring M1. The hydraulic oil flows between the first gap J1; and when the first piston 122 slides toward the second direction F2 (opposite to the first direction F1), the first sealing ring M1 can move with the first piston rod 1222 to enter the hydraulic chamber 121Y from the first slide H1, and automatically cancel the abutment with the inner wall of the first slide H1 after entering the hydraulic chamber 121Y, thereby canceling the seal of the first gap J1, so that the hydraulic chamber 121Y and the first gap J1 are in a connected state, and the hydraulic oil can flow between the hydraulic chamber 121Y and the first gap J1.

[0096] The control handle 100 has an operational state and a non-operating state (i.e., an idle and unused state). In the operational state, when the user operates the control handle 100 to unlock, as the first piston 122 moves, the first sealing ring M1 enters the first slideway H1 and abuts against the inner wall of the first slideway H1 to seal the first gap J1, thereby isolating the hydraulic chamber 121Y from the first gap J1, and preventing excess hydraulic oil from flowing into the oil storage tank 130 during the unlocking process, and only flowing into the pressure relief chamber 122X for pressure relief. In addition, in the non-operating state, based on the position of the first piston 122, the first sealing ring M1 is correspondingly located in the hydraulic chamber 121Y, and does not seal the first gap J1. Even if the volume of the hydraulic oil changes due to the influence of the external ambient temperature, since the hydraulic chamber 121Y is connected to the first gap J1, the hydraulic oil can flow between the hydraulic chamber 121Y and the liquid storage tank 130 to adapt to the external ambient temperature.

[0097] In order to accurately execute the locking and unlocking actions, the hydraulic cylinder 120 of the control handle 100 usually needs to be filled with sufficient hydraulic oil. However, during the operation of the hydraulic cylinder 120, more hydraulic oil will cause excessive oil pressure inside the cylinder body 121, which may easily damage the seal and cause oil leakage. In severe cases, it may even cause the cylinder body 1211 to deform or rupture, which not only poses a high safety risk, but also causes the control handle 100 to fail and become unusable.

[0098] To improve the safety and reliability of the hydraulic system of the control handle 100, in some embodiments, reference Figure 3 and Figure 6 , the control handle also includes:

[0099] The pressure relief chamber 122X is used to accommodate hydraulic fluid;

[0100] Among them, the first piston 122 is provided with a pressure relief hole 122K, the hydraulic chamber 121Y is connected with the pressure relief chamber 122X through the pressure relief hole 122K, and the pressure relief chamber 122X is provided with a first reset member 123 and a slidable second piston 124. The first reset member 123 acts on the second piston 124 to apply a force to the second piston 124 to reset it.

[0101] Specifically, the control handle is provided with a pressure relief chamber 122X, and a second piston 124 and a first reset member 123 are provided in the pressure relief chamber 122X, and the hydraulic chamber 121Y is connected to the pressure relief chamber 122X through the pressure relief hole 122K provided on the first piston 122, and the hydraulic fluid can flow between the pressure relief chamber 122X and the hydraulic chamber 121Y. Among them, a pressure relief bag (not shown) may be installed in the handle shell 110, and along the axial direction of the handle shell 110, the hydraulic cylinder 120 and the pressure relief bag are sequentially arranged, and the internal cavity of the pressure relief bag is correspondingly formed as the pressure relief chamber 122X, and is connected to the hydraulic chamber 121Y. This is only exemplary and not restrictive. Optionally, the sliding direction of the second piston 124 may be a first direction F1 or a second direction F2 along the axial direction of the cylinder body 121, and the first direction F1 is opposite to the second direction F2. The pressure relief hole 122K penetrates the first piston 122 to connect the pressure relief chamber 122X with the hydraulic chamber 121Y. The first reset member 123 may be a spring, a spring sheet, etc., including but not limited to these. When the hydraulic fluid in the hydraulic chamber 121Y flows into the pressure relief chamber 122X through the pressure relief hole 122K, the second piston 124 is correspondingly squeezed to move from the initial position toward the second direction F2; when the hydraulic fluid in the pressure relief chamber 122X flows into the hydraulic chamber 121Y through the pressure relief hole 122K, the second piston 124 moves toward the first direction F1 under the action of the first reset member 123 and resets to the initial position.

[0102] Based on the provided pressure relief chamber 122X, the unlocking process of the control handle 100 is as follows:

[0103] The first piston 122 is driven to move to squeeze the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the outside (such as the support foot locking assembly). When the hydraulic fluid squeezed outward reaches the maximum working volume (that is, the hydraulic fluid that can be received by the outside reaches the maximum receiving volume), as the first piston 122 continues to move, the excess hydraulic fluid in the hydraulic chamber 121Y will be driven to flow into the pressure relief chamber 122X through the pressure relief hole 122K and squeeze the second piston 124 in the pressure relief chamber 122X to achieve pressure relief.

[0104] The locking process is:

[0105] The first piston 122 is driven to move to draw the external hydraulic fluid back into the hydraulic chamber 121Y from the flow hole 121G. When the hydraulic fluid squeezed outward reaches the minimum working volume, as the first piston 122 continues to move, the second piston 124 is reset to the initial position under the force applied by the first reset member 123, and the hydraulic fluid in the pressure relief chamber 122X flows back to the hydraulic chamber 121Y through the pressure relief hole 122K.

[0106] That is, during the operation of the hydraulic cylinder 120 of the control handle 100, the excess hydraulic fluid in the hydraulic chamber 121Y of the hydraulic cylinder 120 is received through the pressure relief chamber 122X to achieve pressure relief, thereby avoiding excessive pressure of the hydraulic fluid inside the cylinder body 121, reducing the probability of oil leakage due to damage to the seal, reducing safety risks such as deformation or rupture of the cylinder body 121, and improving the safety and reliability of the operation of the hydraulic system in the control handle 100.

[0107] In some embodiments, reference Figure 3 , Figure 5 and Figure 6 The first piston 122 includes a first piston disc 1221 and a first piston rod 1222 protruding from a side surface of the first piston disc 1221, and the first piston disc 1221 is slidably matched with the cavity wall of the hydraulic cavity 121Y;

[0108] The pressure relief chamber 122X is constructed on the first piston disc 1221 .

[0109] In this embodiment, the first piston disc 1221 and the first piston rod 1222 of the first piston 122 can be integrally formed, the first piston rod 1222 is located on the central axis of the first piston disc 1221, and the first piston rod 1222 protrudes and extends on one side of the first piston disc 1221. The first piston disc 1221 and the first piston rod 1222 are in a follower relationship, when either the first piston rod 1222 or the first piston disc 1221 moves under the action of an external force, the other will be driven to move accordingly. When the first piston disc 1221 slides along the cavity wall of the hydraulic cavity 121Y, the storage volume of the hydraulic cavity 121Y can be correspondingly compressed or expanded. Optionally, the outer wall of the first piston disc 1221 is sleeved with a first sealing member, the first sealing member can slide with the first piston disc 1221, the first sealing member abuts against the cavity wall of the hydraulic cavity 121Y to achieve a liquid-proof seal, and the first sealing member can be an elastic ring.

[0110] Among them, by setting the pressure relief chamber 122X on the first piston disc 1221, the structure is compact and occupies a small space, which is conducive to miniaturization and lightness of the control handle 100; and the first piston disc 1221 is larger in volume than the first piston rod 1222. Therefore, compared with setting the pressure relief chamber 122X on the first piston rod 1222, by setting the pressure relief chamber 122X on the first piston disc 1221, the pressure relief chamber 122X can have a larger volume, and can thus accommodate more hydraulic fluid during pressure relief, thereby improving the pressure relief capacity.

[0111] In some embodiments, reference Figure 3 , Figure 5 and Figure 6The second piston 124 includes a second piston disc 1241 and a second piston rod 1242 protruding from a side surface of the second piston disc 1241, and the second piston disc 1241 is slidably matched with the cavity wall of the pressure relief cavity 122X;

[0112] The first return member 123 is a first return spring, one end of which abuts against the cavity wall of the pressure relief cavity 122X, and the other end of which abuts against the second piston disc 1241 .

[0113] In this embodiment, the second piston disc 1241 and the second piston rod 1242 of the second piston 124 can be integrally formed, and the second piston rod 1242 is located on the central axis of the second piston disc 1241, and the second piston rod 1242 is convexly extended on one side of the second piston disc 1241. The second piston disc 1241 and the second piston rod 1242 are in a follower relationship. When either the second piston rod 1242 or the second piston disc 1241 moves under the action of an external force, the other will be driven to move accordingly. When the second piston disc 1241 slides along the cavity wall of the pressure relief chamber 122X, the storage volume of the pressure relief chamber 122X can be correspondingly compressed or expanded. Optionally, the outer wall of the second piston disc 1241 is sleeved with a second sealing member, and the second sealing member can slide with the second piston disc 1241, and the second sealing member abuts against the cavity wall of the pressure relief chamber 122X to achieve a liquid-proof seal, and the second sealing member can be an elastic ring. Optionally, the second piston rod 1242 is coaxially arranged with the first piston rod 1222. In this way, by arranging the first piston 122 and the second piston 124 and other components along the axial direction of the hydraulic cylinder 120, it is possible to avoid the radial dimension of the hydraulic cylinder 120 being too large.

[0114] The first return member 123 adopts a first return spring, which abuts against the second piston disc 1241, thereby applying a force to the second piston 124. In combination with the above-mentioned embodiment, when the hydraulic fluid in the hydraulic chamber 121Y flows into the pressure relief chamber 122X through the pressure relief hole 122K, the second piston 124 is correspondingly squeezed to move from the initial position. At the same time, the first return spring is compressed by the second piston disc 1241 of the second piston 124 to accumulate elastic potential energy; when the hydraulic fluid in the pressure relief chamber 122X flows back to the hydraulic chamber 121Y through the pressure relief hole 122K, the first return spring releases the elastic potential energy, and pushes the second piston disc 1241 of the second piston 124, thereby driving the second piston 124 to return to the initial position.

[0115] In some embodiments, reference Figure 3 , Figure 5 and Figure 6The second piston 124 is inverted in the pressure relief chamber 122X, the second piston rod 1242 faces opposite to the first piston rod 1222, and the second piston rod 1242 is arranged to pass through the second piston plate 1241, and the first return spring is sleeved on the second piston rod 1242;

[0116] The pressure relief hole 122K is constructed on the first piston rod 1222 . The first piston rod 1222 is provided with a pressure relief channel Xt. The pressure relief hole 122K is connected to the pressure relief chamber 122X through the pressure relief channel Xt.

[0117] The so-called inverted installation is an inverted installation. In the pressure relief chamber 122X, the second piston 124 is invertedly arranged along the axial direction of the hydraulic cylinder 120, and the setting direction of the first piston 122 is used as a reference direction. The second piston rod 1242 is in the opposite direction to the first piston rod 1222. For example, Figure 6 As shown, along the axial direction of the cylinder body 121, the first piston rod 1222 faces the first direction F1, and the second piston rod 1242 faces the second direction F2 opposite to the first direction F1. In addition, the first return spring is sleeved on the second piston rod 1242, and the second piston rod 1242 has a limiting effect on the first return spring, so that the first return spring is not easy to deviate from the installation position, and the force applied by the first return spring to the second piston disc 1241 is balanced and stable.

[0118] The pressure relief channel Xt may be extended along the length direction of the first piston rod 1222, and the central axis of the pressure relief channel Xt coincides with the central axis of the first piston rod 1222. The pressure relief hole 122K penetrates the first piston rod 1222 from the outer side wall of the first piston rod 1222 and communicates with the pressure relief channel Xt, and one end of the pressure relief channel Xt communicates with the pressure relief chamber 122X. Furthermore, the hydraulic chamber 121Y, the pressure relief hole 122K, the pressure relief channel Xt, and the pressure relief chamber 122X are connected in sequence. When the first piston 122 slides to compress the storage volume of the hydraulic chamber 121Y, the flow path of the hydraulic fluid is: hydraulic chamber 121Y→pressure relief hole 122K→pressure relief channel Xt→pressure relief chamber 122X, that is, the hydraulic fluid in the hydraulic chamber 121Y flows into the pressure relief channel Xt through the pressure relief hole 122K, and enters the pressure relief chamber 122X through the pressure relief channel Xt; when the first piston 122 slides to expand the storage volume of the hydraulic chamber 121Y, the flow path of the hydraulic fluid is: pressure relief chamber 122X→pressure relief channel Xt→pressure relief hole 122K→hydraulic chamber 121Y, that is, the hydraulic fluid in the pressure relief chamber 122X flows into the pressure relief channel Xt, and flows back to the hydraulic chamber 121Y through the pressure relief hole 122K.

[0119] In some embodiments, reference Figures 2 to 4 , Fig. 9 , the control handle 100 further includes:

[0120] The wrench 140 is located on the peripheral side of the handle shell 110. One end of the wrench 140 is hinged to the handle shell 110 and is provided with a top piece 150. The top piece 150 is provided in the handle shell 110 and acts on one end of the first piston rod 1222 away from the first piston disc 1221. The wrench 140 can drive the top piece 150 to act on the first piston rod 1222 by rotating to drive the first piston 122 to move.

[0121] The second restoring member 160 is disposed in the hydraulic chamber 121Y. The second restoring member 160 acts on the first piston disc 1221 to apply a force to the first piston disc 1221 to restore the first piston 122 .

[0122] The wrench 140 involved in this embodiment is used for unlocking. The user can operate (such as squeezing) the wrench 140 to rotate to transmit the lift-up member 150, and the lift-up member 150 correspondingly lifts the first piston rod 1222 to drive the first piston 122 to move from the initial position toward the first direction F1, thereby squeezing the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the outside (such as the locking assembly of the support foot), thereby unlocking the telescopic adjustment function of the support foot, so that the user can adjust the height of the support foot.

[0123] When the height of the support leg is adjusted, the user can release the wrench 140, and the first piston 122 moves toward the second direction F2 (opposite to the first direction F1) under the action of the second reset member 160 for reset, and then draws the external hydraulic fluid back into the hydraulic chamber 121Y from the flow hole 121G, thereby locking the telescopic adjustment function of the support leg.

[0124] Among them, Figure 4 As shown, a detachable piston cap 1223 may be provided at one end of the first piston rod 1222 away from the first piston disc 1221. Optionally, the piston cap 1223 is sleeved on the first piston rod 1222 and threadedly matched with the first piston rod 1222. Specifically, the top member 150 acts on the first piston rod 1222 by being supported on the bottom of the piston cap 1223. The top member 150 is configured with two arms 153 disposed at opposite intervals, and the two arms 153 are correspondingly supported on both sides of the bottom of the piston cap 1223.

[0125] Optionally, the second return member 160 is a second return spring, one end of which abuts against the wall of the hydraulic chamber 121Y, and the other end abuts against the first piston disc 1221. The second return spring is sleeved on the first piston rod 1222, and the first piston rod 1222 has a limiting effect on the second return spring, so that the second return spring is not easy to deviate from the installation position, and the force applied by the second return spring to the first piston disc 1221 is balanced and stable.

[0126] In some embodiments, reference Figures 2 to 4 , Figures 9 to 11 , the control handle 100 further includes:

[0127] A knob 170 rotatably disposed at one end of the wrench 140 ;

[0128] The abutment block 180 is located on a side of the wrench 140 facing the handle housing 110 and connected to the knob 170;

[0129] A first torsion spring 191 is disposed between the wrench 140 and the knob 170, and the first torsion spring 191 is used to apply a force to the knob 170 to reset it;

[0130] A second torsion spring 192 is disposed between the wrench 140 and the handle housing 110 , and the second torsion spring 192 is used to apply a force to the wrench 140 to reset it;

[0131] Among them, one end of the top piece 150 is hinged to the wrench 140 and the handle shell 110 through a hinge axis Jz, and the other end acts on the first piston rod 1222. The top piece 150 is provided with a supporting surface 151 and a receiving port 152 which are arranged adjacent to each other along the axial direction of the hinge axis Jz. The supporting block 180 can move to a first position of supporting against the supporting surface 151 or a second position of being received in the receiving port 152 as the knob 170 rotates.

[0132] In this embodiment, the wrench 140 can be hinged to the handle shell 110 through the hinge shaft Jz to achieve a rotatable setting. The second torsion spring 192 can be sleeved on the hinge shaft Jz and connected to the handle shell 110 and the wrench 140 respectively, and the second torsion spring 192 keeps applying a force to the wrench 140 to reset it. The knob 170 can be installed on the wrench 140 through a rotating shaft to achieve a rotatable setting. The first torsion spring 191 can be sleeved on the rotating shaft and connected to the wrench 140 and the knob 170 respectively, and the first torsion spring 191 keeps applying a force to the knob 170 to reset it. One end of the top member 150 is the action end acting on the first piston rod 1222, and the other end of the top member 150 is correspondingly sleeved on the hinge shaft Jz, so that it can rotate around the hinge shaft Jz. The abutment block 180 is configured with an arc-shaped abutment portion, and when the knob 170 rotates, the arc-shaped abutment portion of the abutment block 180 can rotate accordingly. When the arc-shaped abutment portion of the abutment block 180 rotates to the first position, it can correspondingly abut against the abutment surface 151 of the tilting top member 150; when the arc-shaped abutment portion of the abutment block 180 rotates to the second position, it can correspondingly be accommodated in the accommodating opening 152 of the tilting top member 150.

[0133] The wrench 140 has a stowed state and an unfolded state, and can be switched between the two states. Figure 3When the wrench 140 is in the working state (corresponding to Fig. 9 ), the corresponding state is expanded.

[0134] If the user needs to operate the control handle 100 to unlock the support leg telescopic adjustment function, the wrench 140 needs to be moved from the non-working state (i.e., the idle state) in advance. Figure 3 As shown) switch to the working state (corresponding to Fig. 9 shown).

[0135] Specifically, the user can switch the wrench 140 from the storage state to the deployment state by lifting it, wherein, during the lifting process of the wrench 140, as the wrench 140 rotates outward (i.e., rotates away from the handle shell 110), the abutment block 180 gradually withdraws from the accommodating opening 152 at the second position correspondingly, and the angle between the wrench 140 and the top member 150 gradually increases. When the wrench 140 is lifted to the preset position, the abutment block 180 completely withdraws from the accommodating opening 152 without being blocked by the inner wall of the accommodating opening 152, the first torsion spring 191 releases its elastic potential energy, and the knob 170 rotates under the action of the first torsion spring 191 and drives the abutment block 180 to rotate, so that the abutment block 180 switches from the second position to the first position, and then abuts against the abutment surface 151 (such as the top member 150) of the top member 150. Fig. 9 As shown). Through the abutment and cooperation between the abutment block 180 and the tilting top member 150, the wrench 140 can be kept in the unfolded state, and transmission can be performed between the wrench 140 and the tilting top member 150, and the wrench 140 is correspondingly switched to the working state.

[0136] In the operable state, the user can operate (such as gripping) the wrench 140 to rotate inward (i.e., rotate close to the handle shell 110) to drive the top member 150 to rotate through the abutment block 180, and the top member 150 correspondingly lifts the first piston rod 1222 to drive the first piston 122 to move from the initial position toward the first direction F1, thereby squeezing the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the outside (such as the support foot locking assembly), thereby unlocking the support foot telescopic adjustment function, so that the user can adjust the support foot height. When the support foot height is adjusted, the user can release the wrench 140, and the first piston 122 moves toward the second direction F2 (opposite to the first direction F1) under the action of the second reset member 160 to reset, thereby pumping the external hydraulic fluid back into the hydraulic chamber 121Y from the flow hole 121G, thereby locking the support foot telescopic adjustment function.

[0137] When the user does not need to unlock the telescopic adjustment function of the support leg, the wrench 140 can be switched from the working state to the non-working state (that is, the idle state), that is, the wrench 140 can be switched from the unfolded state to the stored state for daily storage.

[0138] Specifically, the user can rotate the knob 170 to drive the abutting block 180 to rotate, so that the abutting block 180 switches from the first position to the second position, that is, the abutting block 180 is separated from the abutting surface 151 of the top member 150 and reaches the receiving port 152, and then loosens the knob 170. After the knob 170 is loosened, the second torsion spring 192 releases elastic potential energy, and the wrench 140 rotates inwardly (that is, rotates close to the handle shell 110) under the action of the second torsion spring 192. As the wrench 140 rotates inwardly, the abutting block 180 gradually enters the receiving port 152. When the abutting block 180 is received in the receiving port 152, the wrench 140 is correspondingly in the storage state, and the wrench 140 is correspondingly switched to the non-working state, which is simple to operate and convenient to use.

[0139] The present invention also provides a control handle 100 of a photography support frame, which is used to unlock or lock the support leg locking assembly of the photography support frame, wherein Figures 2 to 4 , the control handle 100 comprises:

[0140] Handle housing 110;

[0141] The hydraulic cylinder 120 is disposed in the handle housing 110. The hydraulic cylinder 120 includes a cylinder body 121 and a first piston 122. The cylinder body 121 is provided with a hydraulic chamber 121Y for storing hydraulic fluid and a flow hole 121G communicating with the hydraulic chamber 121Y and allowing the hydraulic fluid to enter and exit the hydraulic chamber 121Y. The flow hole 121G is used to communicate with the support foot locking assembly. The first piston 122 is slidably disposed in the hydraulic chamber 121Y and is used to squeeze the hydraulic fluid in the hydraulic chamber 121Y from the flow hole 121G or to draw the hydraulic fluid back to the hydraulic chamber 121Y.

[0142] Among them, the first piston 122 is provided with a pressure relief chamber 122X for accommodating hydraulic fluid and a pressure relief hole 122K connecting the pressure relief chamber 122X and the hydraulic chamber 121Y and allowing the hydraulic fluid to pass through. A first reset member 123 and a slidable second piston 124 are provided in the pressure relief chamber 122X. The first reset member 123 acts on the second piston 124 to apply a force to the second piston 124 to reset it.

[0143] The control handle 100 involved in this embodiment, as a component of the photographic support frame, can be linked with the support leg locking assembly of the photographic support frame to lock or unlock the support leg locking assembly of the photographic support frame, that is, the user can operate the control handle 100 to lock the support leg locking assembly, and in the locked state, the support leg cannot be extended or retracted; or, the user can unlock the support leg locking assembly, and in the unlocked state, the user can operate the support leg to extend or retract to adjust its support height, and lock it again after the adjustment.

[0144] Specifically, the photography support frame may include a receiving seat 200 and a plurality of supporting legs 300 connected to the receiving seat 200 and used to support the receiving seat 200. The receiving seat 200 is used to install photographic equipment, such as a camera, etc. The supporting leg locking assembly is correspondingly arranged at the supporting leg 300, and is used to clamp or release the supporting leg 300. The control handle 100 may be installed on the receiving seat 200, and correspondingly forms a linkage arrangement with the supporting leg locking assembly.

[0145] In the control handle 100, as Figure 2 As shown, the handle shell 110 may be in the shape of a long cylinder, which is convenient for the user to hold. The handle shell 110 is internally structured with a storage space, which may accommodate components such as the hydraulic cylinder 120, including but not limited to the above. The handle shell 110 may include a first half shell and a second half shell, and the first half shell and the second half shell are butt-jointed to enclose and form a storage space. In addition, the first half shell and the second half shell are detachably connected, and the detachable connection method may be a screw connection, a snap connection, etc.

[0146] The hydraulic cylinder 120 can slide in the hydraulic chamber 121Y of the cylinder body 121 through its first piston 122, and the hydraulic fluid can be squeezed outward or drawn inward from the position of the flow hole 121G. The sliding direction of the first piston 122 can be a first direction F1 or a second direction F2 along the axial direction of the cylinder body 121, and the first direction F1 is opposite to the second direction F2. The flow hole 121G can be set on the end surface of one end of the cylinder body 121, and the flow hole 121G passes through the cylinder body 121 and is connected to the hydraulic chamber 121Y. The hydraulic fluid can be hydraulic oil. Figure 3 As shown, when the first piston 122 slides toward the first direction F1, the storage volume of the hydraulic chamber 121Y storing the hydraulic fluid gradually decreases to correspond to the hydraulic fluid being squeezed out of the flow hole 121G; when the first piston 122 slides toward the second direction F2, the storage volume of the hydraulic chamber 121Y storing the hydraulic fluid gradually expands to correspond to the hydraulic fluid being drawn in through the flow hole 121G.

[0147] The flow hole 121G on the cylinder body 121 of the hydraulic cylinder 120 in the control handle can be connected to the support foot locking assembly, and the first piston 122 slides in the hydraulic chamber 121Y, and the hydraulic fluid is output from the flow hole 121G or withdrawn to drive the support foot locking assembly to perform the unlocking action or locking action accordingly. Among them, the first liquid pipe can be connected between the flow hole 121G and the locking assembly of the support foot, and the hydraulic fluid is transported through the first liquid pipe.

[0148] During the unlocking process, the first piston 122 of the hydraulic cylinder 120 is driven to move to squeeze the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the support leg locking assembly. Under the pressure of the hydraulic fluid, the components of the support leg locking assembly correspondingly perform the unlocking action, thereby achieving unlocking;

[0149] During the locking process, the first piston 122 is driven to move so as to draw the hydraulic fluid at the supporting foot locking assembly back to the hydraulic chamber 121Y from the flow hole 121G. As the pressure of the hydraulic fluid is reduced, the components of the supporting foot locking assembly correspondingly perform locking actions (such as resetting through elastic parts), thereby achieving locking.

[0150] Correspondingly, the support foot locking assembly may include an oil cylinder and an actuator, and the actuator is connected to the piston of the oil cylinder in a transmission manner to clamp or release the support foot. The flow hole 121G of the hydraulic cylinder 120 is connected to the oil cylinder, and the hydraulic cylinder 120 can deliver hydraulic fluid to the oil cylinder or withdraw hydraulic fluid from the oil cylinder to make the piston of the oil cylinder move, thereby transmitting the actuator, so that the actuator clamps the support foot to switch the support foot to a non-retractable locked state or releases the support foot to switch the support foot to a retractable unlocked state. This is only exemplary and not restrictive.

[0151] The control handle may be provided with an unlocking component for controlling the sliding of the first piston 122 of the hydraulic cylinder 120. The unlocking component may be a manual unlocking component, which is in transmission connection with the first piston 122 of the hydraulic cylinder 120. The user manually controls the manual unlocking component to drive the first piston 122 to slide, so as to unlock or lock. The manual unlocking component may be, for example, a wrench, a button, a sliding button, etc., which is not limited in this embodiment.

[0152] The control handle 100 of the present invention adopts a hydraulic handle. Compared with the existing electric control handle, it does not need to be charged, so there is no need to carry additional chargers, mobile power supplies and other equipment, which reduces the burden of carrying and is easy to use.

[0153] As a preferred embodiment, the control handle 100 can be linked with the support leg locking assemblies corresponding to each support leg. In this way, the user can unlock and lock multiple support leg locking assemblies at the same time by operating the control handle 100 with one button, without having to perform the unlocking operation one by one, which is easy to use.

[0154] Further, the control handle is provided with a pressure relief chamber 122X, and a second piston 124 and a first reset member 123 are provided in the pressure relief chamber 122X, and the hydraulic chamber 121Y is connected with the pressure relief chamber 122X through the pressure relief hole 122K provided on the first piston 122, and the hydraulic fluid can flow between the pressure relief chamber 122X and the hydraulic chamber 121Y. Optionally, the sliding direction of the second piston 124 can be a first direction F1 or a second direction F2 along the axial direction of the cylinder body 121, and the first direction F1 is opposite to the second direction F2. The pressure relief hole 122K penetrates the first piston 122 to connect the pressure relief chamber 122X with the hydraulic chamber 121Y, and the first reset member 123 can be a spring, a spring sheet, etc., including but not limited to these. When the hydraulic fluid in the hydraulic chamber 121Y flows into the pressure relief chamber 122X through the pressure relief hole 122K, the corresponding second piston 124 is squeezed to move from the initial position toward the second direction F2; when the hydraulic fluid in the pressure relief chamber 122X flows into the hydraulic chamber 121Y through the pressure relief hole 122K, the second piston 124 moves toward the first direction F1 under the action of the first reset member 123 and resets to the initial position.

[0155] Based on the provided pressure relief chamber 122X, the unlocking process of the control handle is as follows:

[0156] The first piston 122 is driven to move to squeeze the hydraulic fluid in the hydraulic chamber 121Y to flow out from the flow hole 121G to the outside (such as the support foot locking assembly). When the hydraulic fluid squeezed outward reaches the maximum working volume (that is, the hydraulic fluid that can be received by the outside reaches the maximum receiving volume), as the first piston 122 continues to move, the excess hydraulic fluid in the hydraulic chamber 121Y will be driven to flow into the pressure relief chamber 122X through the pressure relief hole 122K and squeeze the second piston 124 in the pressure relief chamber 122X to achieve pressure relief.

[0157] The locking process is:

[0158] The first piston 122 is driven to move to draw the external hydraulic fluid back into the hydraulic chamber 121Y from the flow hole 121G. When the hydraulic fluid squeezed outward reaches the minimum working volume, as the first piston 122 continues to move, the second piston 124 is reset to the initial position under the force applied by the first reset member 123, and the hydraulic fluid in the pressure relief chamber 122X flows back to the hydraulic chamber 121Y through the pressure relief hole 122K.

[0159] That is, during the operation of the hydraulic cylinder 120 of the control handle 100, the excess hydraulic fluid in the hydraulic chamber 121Y of the hydraulic cylinder 120 is received through the pressure relief chamber 122X to achieve pressure relief, thereby avoiding excessive pressure of the hydraulic fluid inside the cylinder body 121, reducing the probability of oil leakage due to damage to the seal, reducing safety risks such as deformation or rupture of the cylinder body 121, and improving the safety and reliability of the operation of the hydraulic system in the control handle 100; and, by providing the pressure relief chamber 122X on the first piston 122, the structure is compact and occupies little space, which is conducive to miniaturization and lightness of the control handle 100.

[0160] In some embodiments, reference Figure 3 and Figure 4 The first piston 122 includes a first piston disc 1221 and a first piston rod 1222 protruding from a side surface of the first piston disc 1221, and the first piston disc 1221 is slidably matched with the cavity wall of the hydraulic cavity 121Y;

[0161] The pressure relief chamber 122X is constructed on the first piston disc 1221 .

[0162] In this embodiment, the first piston disc 1221 and the first piston rod 1222 of the first piston 122 can be integrally formed, the first piston rod 1222 is located on the central axis of the first piston disc 1221, and the first piston rod 1222 protrudes and extends on one side of the first piston disc 1221. The first piston disc 1221 and the first piston rod 1222 are in a follower relationship, when either the first piston rod 1222 or the first piston disc 1221 moves under the action of an external force, the other will be driven to move accordingly. When the first piston disc 1221 slides along the cavity wall of the hydraulic cavity 121Y, the storage volume of the hydraulic cavity 121Y can be correspondingly compressed or expanded. Optionally, the outer wall of the first piston disc 1221 is sleeved with a first sealing member, the first sealing member can slide with the first piston disc 1221, the first sealing member abuts against the cavity wall of the hydraulic cavity 121Y to achieve a liquid-proof seal, and the first sealing member can be an elastic ring.

[0163] Among them, the first piston disc 1221 is larger in volume than the first piston rod 1222. Therefore, compared with setting the pressure relief chamber 122X on the first piston rod 1222, by setting the pressure relief chamber 122X on the first piston disc 1221, the pressure relief chamber 122X can have a larger volume, and can thus accommodate more hydraulic fluid during pressure relief, thereby improving the pressure relief capacity.

[0164] In some embodiments, reference Figure 3 , Figures 5 to 8The second piston 124 includes a second piston disc 1241 and a second piston rod 1242 protruding from a side surface of the second piston disc 1241, and the second piston disc 1241 is slidably matched with the cavity wall of the pressure relief cavity 122X;

[0165] The first return member 123 is a first return spring, one end of which abuts against the cavity wall of the pressure relief cavity 122X, and the other end of which abuts against the second piston disc 1241 .

[0166] In this embodiment, the second piston disc 1241 and the second piston rod 1242 of the second piston 124 can be integrally formed, and the second piston rod 1242 is located on the central axis of the second piston disc 1241, and the second piston rod 1242 is convexly extended on one side of the second piston disc 1241. The second piston disc 1241 and the second piston rod 1242 are in a follower relationship. When either the second piston rod 1242 or the second piston disc 1241 moves under the action of an external force, the other will be driven to move accordingly. When the second piston disc 1241 slides along the cavity wall of the pressure relief chamber 122X, the storage volume of the pressure relief chamber 122X can be correspondingly compressed or expanded. Optionally, the outer wall of the second piston disc 1241 is sleeved with a second sealing member, and the second sealing member can slide with the second piston disc 1241, and the second sealing member abuts against the cavity wall of the pressure relief chamber 122X to achieve a liquid-proof seal, and the second sealing member can be an elastic ring. Optionally, the second piston rod 1242 is coaxially arranged with the first piston rod 1222. In this way, by arranging the first piston 122 and the second piston 124 and other components along the axial direction of the hydraulic cylinder 120, it is possible to avoid the radial dimension of the hydraulic cylinder 120 being too large.

[0167] The first return member 123 adopts a first return spring, which abuts against the second piston disc 1241, thereby applying a force to the second piston 124. In combination with the above-mentioned embodiment, when the hydraulic fluid in the hydraulic chamber 121Y flows into the pressure relief chamber 122X through the pressure relief hole 122K, the second piston 124 is correspondingly squeezed to move from the initial position. At the same time, the first return spring is compressed by the second piston disc 1241 of the second piston 124 to accumulate elastic potential energy; when the hydraulic fluid in the pressure relief chamber 122X flows back to the hydraulic chamber 121Y through the pressure relief hole 122K, the first return spring releases the elastic potential energy, and pushes the second piston disc 1241 of the second piston 124, thereby driving the second piston 124 to return to the initial position.

[0168] In the hydraulic system of the control handle 100, different characteristics are provided when used according to the type of hydraulic fluid selected. For example, when the hydraulic fluid is hydraulic oil, the hydraulic oil has the characteristic of thermal expansion and contraction. However, when the user uses the photography support, the weather environment may be hot or cold, and the volume of the hydraulic oil in the hydraulic system of the control handle 100 is easily affected by the temperature and changes.

[0169] To ensure the stability of the hydraulic system of the control handle 100, in some embodiments, reference Figure 4 and Figure 6 The cylinder body 121 is also provided with a first slideway H1 extending along its axial direction, one end of the first slideway H1 is connected to the hydraulic chamber 121Y, and the other end of the first slideway H1 is provided with an opening, and the first piston rod 1222 passes through the first slideway H1 and passes through the cylinder body 121 through the opening;

[0170] A first gap J1 is formed between the first piston rod 1222 and the inner wall of the first slide H1 for the hydraulic fluid to pass through. The cylinder body 121 is also provided with a first flow port G1, which passes through the inner wall of the first slide H1 and is connected to the first slide H1. A liquid storage tank 130 is provided in the handle shell 110, and the liquid storage tank 130 is connected to the first flow port G1.

[0171] When the ambient temperature is high, if the hydraulic oil expands due to the high temperature, the expanded hydraulic oil in the hydraulic chamber 121Y can enter the first slide H1, pass through the first gap J1 between the first piston rod 1222 and the inner wall of the first slide H1 and flow into the liquid storage tank 130 through the first flow port G1, and the expanded hydraulic oil is stored in the liquid storage tank 130 to release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120.

[0172] When the ambient temperature is low, if the hydraulic oil shrinks due to the low temperature, the hydraulic oil can flow back from the liquid storage tank 130 through the first flow port G1 and through the first gap J1 between the first piston rod 1222 and the inner wall of the first slideway H1 to the hydraulic chamber 121Y.

[0173] Among them, the first gap J1, the first flow port G1 and the liquid storage tank 130 constitute a pressure relief channel for the hydraulic oil in the hydraulic chamber 121Y, which can avoid damage to the seal and oil leakage caused by high-temperature expansion of the hydraulic oil in the hydraulic chamber 121Y, and prevent deformation or rupture of the cylinder body 121, so that the hydraulic system of the control handle 100 can adapt to the external ambient temperature and improve the applicability of the control handle 100.

[0174] Among them, Figure 4As shown, a liquid storage bag may be installed in the handle shell 110, and the hydraulic cylinder 120 and the oil storage bag are arranged in sequence along the axial direction of the handle shell 110, and the liquid storage bag is correspondingly configured as a liquid storage tank 130. The liquid storage bag is constructed with a plurality of expansion joints arranged at intervals along its axial direction. The liquid storage bag has a certain elastic deformation capacity and can automatically expand and contract with the change of the amount of hydraulic oil in the bag, thereby adapting to the increase or decrease of the amount of hydraulic oil. A second liquid pipe can be connected between the liquid storage bag and the first flow port G1 to transport hydraulic fluid through the second liquid pipe.

[0175] In some embodiments, reference Figure 7 and Figure 8 , the second piston 124 is mounted on the pressure relief chamber 122X, the second piston rod 1242 is oriented in the same direction as the first piston rod 1222, and the first return spring is located on the side of the second piston disc 1241 away from the second piston rod 1242;

[0176] The first piston rod 1222 is provided with a second slideway H2 extending along its axial direction, one end of the second slideway H2 is connected to the pressure relief chamber 122X, and the second piston rod 1242 penetrates into the second slideway H2 and slides with the second slideway H2;

[0177] The pressure relief chamber 122X at least partially extends into the first piston rod 1222 , and the pressure relief hole 122K is constructed on the first piston rod 1222 and penetrates the inner wall of the pressure relief chamber 122X.

[0178] The so-called normal installation means normal installation. In the pressure relief chamber 122X, the second piston 124 is normally installed along the axial direction of the hydraulic cylinder 120, and the installation direction of the first piston 122 is used as a reference direction. The second piston rod 1242 and the first piston rod 1222 have the same direction. Figure 8 As shown, along the axial direction of the cylinder body 121, the first piston rod 1222 faces the first direction F1, and the second piston rod 1242 faces the first direction F1. In addition, a first return spring is correspondingly arranged on the side of the second piston plate 1241 away from the second piston rod 1242.

[0179] The second slideway H2 may be extended along the length direction of the first piston rod 1222, and the central axis of the second slideway H2 is arranged to coincide with the central axis of the first piston rod 1222. In addition, the pressure relief hole 122K penetrates the first piston rod 1222 from the outer wall of the first piston rod 1222 and communicates with the pressure relief chamber 122X. When the second piston plate 1241 of the second piston 124 slides in the pressure relief chamber 122X, the second piston rod 1242 thereof slides along the second slideway H2 accordingly, and the movement guide can be realized to improve the movement accuracy and movement stability of the second piston 124.

[0180] In some embodiments, reference Figure 8The first piston rod 1222 is also provided with a flow passage Gt extending along its axial direction, and the flow passage Gt is located at the other end of the second slideway H2 and communicates with the second slideway H2;

[0181] A second gap J2 for hydraulic fluid to pass through is formed between the second piston rod 1242 and the inner wall of the second slideway H2. The first piston rod 1222 is also provided with a second flow port G2. The second flow port G2 penetrates the inner wall of the flow channel Gt and is connected to the flow channel Gt.

[0182] The flow channel Gt may be extended along the length direction of the first piston rod 1222, and the central axis of the flow channel Gt coincides with the central axis of the first piston rod 1222. The second flow port G2 penetrates the first piston rod 1222 from the outer side wall of the first piston rod 1222 and communicates with the flow channel Gt, and one end of the flow channel Gt communicates with the second slideway H2.

[0183] When the ambient temperature is high, if the hydraulic oil expands due to the high temperature, the expanded hydraulic oil in the hydraulic chamber 121Y can enter the pressure relief chamber 122X through the pressure relief hole 122K, and the expanded hydraulic oil is first stored through the pressure relief chamber 122X to release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120. When the hydraulic oil stored in the pressure relief chamber 122X reaches the maximum amount, the expanded hydraulic oil enters the second slide H2 from the pressure relief chamber 122X, enters the flow channel Gt through the second gap J2 between the second piston rod 1242 and the inner wall of the second slide H2, and enters the first slide H1 through the second flow port G2, and then passes through the first gap J1 between the first piston rod 1222 and the inner wall of the first slide H1 and flows into the liquid storage tank 130 through the first flow port G1, and the expanded hydraulic oil is stored through the liquid storage tank 130 to further release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120.

[0184] When the ambient temperature is low, the hydraulic oil shrinks due to the low temperature, and the hydraulic oil can flow back to the first slide H1 from the liquid storage tank 130 through the first flow port G1 and the first gap J1 between the first piston rod 1222 and the inner wall of the first slide H1, and then enter the flow channel Gt through the second flow port G2 and flow back to the second slide H2 through the second gap J2 between the second piston rod 1242 and the inner wall of the second slide H2, and finally flow back to the hydraulic chamber 121Y through the pressure relief chamber 122X and the pressure relief hole 122K.

[0185] That is, the pressure relief hole 122K, the pressure relief chamber 122X, the second gap J2, the flow channel Gt, the second flow port G2, the first gap J1, the first flow port G1 and the liquid storage tank 130 constitute a pressure relief channel for the hydraulic oil in the hydraulic chamber 121Y, which can avoid damage to the seal and oil leakage caused by high-temperature expansion of the hydraulic oil in the hydraulic chamber 121Y, and prevent deformation or rupture of the cylinder body 121, so that the hydraulic system of the control handle 100 can adapt to the external ambient temperature and improve the applicability of the control handle 100.

[0186] In some embodiments, reference Figure 8 The outer wall of the second piston rod 1242 is sleeved with a second sealing ring M2, and the second sealing ring M2 can move with the second piston rod 1242, enter the second slideway H2 from the pressure relief chamber 122X to seal the second gap J2, or enter the pressure relief chamber 122X from the second slideway H2 to cancel the seal of the second gap J2. Optionally, the outer wall of the second piston rod 1242 is configured with a second annular groove, and when the second sealing ring M2 is sleeved on the second piston rod 1242, it is correspondingly accommodated in the second annular groove to achieve positioning installation.

[0187] The second sealing ring M2 is arranged to move with the second piston rod 1242. When the second piston 124 slides toward the first direction F1, the second sealing ring M2 can move with the second piston rod 1242 to enter the second slideway H2 from the pressure relief chamber 122X, and automatically abut against the inner wall of the second slideway H2 after entering the second slideway H2, thereby sealing the second gap J2, so that the pressure relief chamber 122X and the second gap J2 are in an isolated state, that is, the hydraulic oil cannot flow between the pressure relief chamber 122X and the second gap J2 through the obstruction of the second sealing ring M2. The hydraulic oil flows between the two gaps J2, and when the second piston 124 slides toward the second direction F2 (opposite to the first direction F1), the second sealing ring M2 can move with the second piston rod 1242 to enter the pressure relief chamber 122X from the second slide H2, and automatically cancel the abutment with the inner wall of the second slide H2 after entering the pressure relief chamber 122X, thereby canceling the seal of the second gap J2, so that the pressure relief chamber 122X and the second gap J2 are in a connected state, and the hydraulic oil can flow between the pressure relief chamber 122X and the second gap J2.

[0188] Among them, the control handle 100 has a working state and a non-working state (that is, an idle and unused state). In the working state, when the user operates the control handle 100 to unlock, as the first piston 122 moves, the hydraulic oil in the hydraulic chamber 121Y can enter the pressure relief chamber 122X through the pressure relief hole 122K; and, in the non-working state, when the hydraulic oil expands due to high temperature, the expanded hydraulic oil in the hydraulic chamber 121Y can enter the pressure relief chamber 122X through the pressure relief hole 122K.

[0189] When the hydraulic oil in the hydraulic chamber 121Y enters the pressure relief chamber 122X, it will simultaneously squeeze the second piston 124 to move, so as to release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120. During the movement of the second piston 124, the second sealing ring M2 enters the pressure relief chamber 122X from the second slideway H2, canceling the seal of the second gap J2. When the hydraulic oil stored in the pressure relief chamber 122X reaches the maximum amount, the expanded hydraulic oil enters the second slideway H2 from the pressure relief chamber 122X, enters the flow channel Gt through the second gap J2 between the second piston rod 1242 and the inner wall of the second slideway H2, and enters the first slideway H1 through the second flow port G2, and then flows into the liquid storage tank 130 through the first gap J1 between the first piston rod 1222 and the inner wall of the first slideway H1 and the first flow port G1, and stores the expanded hydraulic oil through the liquid storage tank 130 to further release the oil pressure inside the cylinder body 121 of the hydraulic cylinder 120.

[0190] In some embodiments, reference Figure 8 , a third sealing ring M3 is embedded in the inner wall of the first slideway H1, and the third sealing ring M3 is arranged near the end of the first slideway H1 that is connected to the hydraulic chamber 121Y and is used to abut the first piston rod 1222. Optionally, a third annular groove is constructed on the inner wall of the first slideway H1, and when the third sealing ring M3 is embedded in the inner wall of the first slideway H1, it is correspondingly accommodated in the third annular groove to achieve positioning installation. The function of the third sealing ring M3 is to isolate the hydraulic chamber 121Y from the first gap J1, which can prevent the hydraulic fluid that enters the first slideway H1 through the second flow port G2 or the hydraulic fluid that enters the first slideway H1 through the first flow port G1 from directly flowing back into the hydraulic chamber 121Y.

[0191] Optionally, refer to Figure 6 and Figure 8 , a fourth sealing ring M4 is embedded in the inner wall of the first slideway H1, and the fourth sealing ring M4 is arranged adjacent to the opening and abuts against the first piston rod 1222. Optionally, a fourth annular groove is configured on the inner wall of the first slideway H1, and when the fourth sealing ring M4 is embedded in the inner wall of the first slideway H1, it is correspondingly accommodated in the fourth annular groove to achieve positioning installation. The fourth sealing ring M4 abuts against the first piston rod 1222 at the opening position to achieve a liquid-proof seal to prevent the hydraulic fluid in the first slideway H1 from leaking from the opening.

[0192] The present invention also provides a photographic support frame, referring to Figure 1 , the photography support frame comprises:

[0193] The receiving seat 200 is used to install photographic equipment;

[0194] A plurality of supporting legs 300 with telescopic adjustment function, connected to the receiving seat 200 and used to support the receiving seat 200, each supporting leg 300 is correspondingly provided with a supporting leg locking assembly;

[0195] The control handle 100 of the photographic support frame as described in the above-mentioned embodiment is disposed on the receiving seat 200 , and the control handle 100 is used to unlock or lock the support leg locking assembly.

[0196] Among them, the specific structure of the control handle 100 of the photography support frame refers to the above-mentioned embodiment. Since the photography support frame adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0197] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A control handle of a photography support stand, used to unlock or lock a support leg locking assembly of the photography support stand, characterized in that: The control handle comprises: Handle shell; A hydraulic cylinder is arranged in the handle shell, and the hydraulic cylinder includes a cylinder body and a first piston. The cylinder body is provided with a hydraulic chamber for storing hydraulic fluid and a flow hole connected with the hydraulic chamber and allowing the hydraulic fluid to enter and exit the hydraulic chamber. The flow hole is used to communicate with the support foot locking assembly. The first piston is slidably arranged in the hydraulic chamber, and is used to squeeze the hydraulic fluid in the hydraulic chamber from the flow hole or to draw the hydraulic fluid back to the hydraulic chamber.

2. The control handle according to claim 1, characterized in that: The first piston comprises a first piston disc and a first piston rod protruding from a side surface of the first piston disc, and the first piston disc is slidably matched with the cavity wall of the hydraulic cavity.

3. The control handle according to claim 2, characterized in that: The cylinder body is provided with a first slideway extending along its axial direction, one end of the first slideway is butted with the hydraulic chamber, the other end of the first slideway is provided with an opening, the first piston rod passes through the first slideway and passes out of the cylinder body through the opening; A first gap is formed between the first piston rod and the inner wall of the first slideway for hydraulic fluid to pass through. The cylinder body is also provided with a first flow port, which passes through the inner wall of the first slideway and is connected to the first slideway. A liquid storage tank is provided in the handle shell, and the liquid storage tank is connected to the first flow port.

4. The control handle according to claim 3, characterized in that: The outer wall of the first piston rod is sleeved with a first sealing ring, which can move with the first piston rod, enter the first slideway from the hydraulic chamber to seal the first gap, or enter the hydraulic chamber from the first slideway to cancel the sealing of the first gap.

5. The control handle according to claim 1, characterized in that: Also includes: a pressure relief chamber for containing hydraulic fluid; The first piston is provided with a pressure relief hole, the hydraulic chamber is connected with the pressure relief chamber through the pressure relief hole, a first reset member and a slidable second piston are provided in the pressure relief chamber, and the first reset member acts on the second piston to apply a force to the second piston to reset it.

6. The control handle according to claim 5, characterized in that: The first piston comprises a first piston plate and a first piston rod protruding from a side surface of the first piston plate, and the first piston plate is slidably matched with the cavity wall of the hydraulic cavity; Wherein, the pressure relief chamber is constructed on the first piston disk.

7. The control handle according to claim 6, characterized in that: The second piston comprises a second piston disc and a second piston rod protruding from a side surface of the second piston disc, and the second piston disc is slidably matched with the cavity wall of the pressure relief cavity; The first return member is a first return spring, one end of which abuts against the cavity wall of the pressure relief cavity, and the other end of which abuts against the second piston disc.

8. The control handle according to claim 7, characterized in that: The second piston is inverted in the pressure relief chamber, the second piston rod is opposite to the first piston rod, and the second piston rod is arranged to pass through the first piston plate, and the first return spring is sleeved on the second piston rod; The pressure relief hole is constructed on the first piston rod. The first piston rod is provided with a pressure relief channel. The pressure relief hole is communicated with the pressure relief chamber through the pressure relief channel.

9. The control handle according to any one of claims 2 to 8, characterized in that: Also includes: a wrench, located at the peripheral side of the handle shell, one end of the wrench is hinged to the handle shell and is provided with a top piece, the top piece is provided in the handle shell and acts on one end of the first piston rod away from the first piston disc, the wrench can be rotated to drive the top piece to act on the first piston rod, so as to drive the first piston to move; The second restoring member is disposed in the hydraulic chamber, and acts on the first piston disc to apply a force to the first piston disc to restore the first piston.

10. The control handle according to claim 9, characterized in that: Also includes: A knob rotatably disposed at one end of the wrench; A holding block, located on a side of the wrench facing the handle housing and connected to the knob; a first torsion spring, disposed between the wrench and the knob, the first torsion spring being used to apply a force to the knob to reset it; a second torsion spring, disposed between the wrench and the handle housing, the second torsion spring being used to apply a force to the wrench to reset it; Among them, one end of the top piece is hinged to the wrench and the handle shell through a hinge shaft, and the other end acts on the first piston rod. The top piece is provided with a supporting surface and a receiving opening arranged adjacent to each other along the axial direction of the hinge shaft. The supporting block can move with the rotation of the knob to a first position where it can be supported by the supporting surface or a second position where it can be received in the receiving opening.

11. A control handle of a photography support stand, used to unlock or lock a support leg locking assembly of the photography support stand, characterized in that: The control handle comprises: Handle shell; A hydraulic cylinder is arranged in the handle shell, the hydraulic cylinder comprises a cylinder body and a first piston, the cylinder body is provided with a hydraulic chamber for storing hydraulic fluid and a flow hole communicating with the hydraulic chamber and allowing the hydraulic fluid to enter and exit the hydraulic chamber, the flow hole is used to communicate with the support foot locking assembly, the first piston is slidably arranged in the hydraulic chamber, and is used to squeeze the hydraulic fluid in the hydraulic chamber from the flow hole or to draw the hydraulic fluid back to the hydraulic chamber; Among them, the first piston is provided with a pressure relief chamber for accommodating hydraulic fluid and a pressure relief hole connecting the pressure relief chamber with the hydraulic chamber and allowing the hydraulic fluid to pass through. A first reset member and a slidable second piston are provided in the pressure relief chamber. The first reset member acts on the second piston to apply a force to the second piston to reset it.

12. The control handle according to claim 11, characterized in that: The first piston comprises a first piston plate and a first piston rod protruding from a side surface of the first piston plate, and the first piston plate is slidably matched with the cavity wall of the hydraulic cavity; Wherein, the pressure relief chamber is at least partially constructed on the first piston disk.

13. The control handle according to claim 12, characterized in that: The second piston comprises a second piston disc and a second piston rod protruding from a side surface of the second piston disc, and the second piston disc is slidably matched with the cavity wall of the pressure relief cavity; The first return member is a first return spring, one end of the first return spring abuts against the cavity wall of the pressure relief cavity, and the other end of the first return spring abuts against the second piston disc.

14. The control handle according to claim 13, characterized in that: The cylinder body is further provided with a first slideway extending along its axial direction, one end of the first slideway is butted with the hydraulic chamber, the other end of the first slideway is provided with an opening, the first piston rod passes through the first slideway and passes out of the cylinder body through the opening; A first gap is formed between the first piston rod and the inner wall of the first slideway for hydraulic fluid to pass through. The cylinder body is also provided with a first flow port, which passes through the inner wall of the first slideway and is connected to the first slideway. A liquid storage tank is provided in the handle shell, and the liquid storage tank is connected to the first flow port.

15. The control handle according to claim 14, characterized in that: The second piston is mounted on the pressure relief chamber, the second piston rod and the first piston rod are oriented in the same direction, and the first return spring is located on a side of the second piston disc away from the second piston rod; The first piston rod is provided with a second slideway extending along its axial direction, one end of the second slideway is butted with the pressure relief chamber, and the second piston rod penetrates into the second slideway and slides in cooperation with the second slideway; The pressure relief chamber at least partially extends into the first piston rod, and the pressure relief hole is constructed on the first piston rod and is arranged through the inner wall of the pressure relief chamber.

16. The control handle according to claim 15, characterized in that: The first piston rod is also provided with a flow passage extending along its axial direction, and the flow passage is located at the other end of the second slideway and communicated with the second slideway; A second gap through which hydraulic fluid can pass is formed between the second piston rod and the inner wall of the second slideway. The first piston rod is also provided with a second flow port, which penetrates the inner wall of the flow channel and is connected to the flow channel.

17. The control handle according to claim 16, characterized in that: A second sealing ring is sleeved on the outer wall of the second piston rod. The second sealing ring can move with the second piston rod, enter the second slideway from the pressure relief chamber to seal the second gap, or enter the pressure relief chamber from the second slideway to cancel the seal of the second gap.

18. The control handle according to claim 16, characterized in that: A third sealing ring is embedded in the inner wall of the first slideway. The third sealing ring is arranged adjacent to an end of the first slideway that butts against the hydraulic chamber and is used to abut against the first piston rod.

19. A photography support frame, characterized in that: include: A receiving seat for mounting photographic equipment; A plurality of support legs with telescopic adjustment function, connected to the receiving seat and used to support the receiving seat, each of the support legs correspondingly provided with a support leg locking assembly; The control handle as claimed in any one of claims 1 to 10 or 11 to 18 is arranged on the receiving seat, and the control handle is used to unlock or lock the supporting leg locking assembly.

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