Hydraulic support frame capable of unlocking and locking by one key

Abstract

The invention discloses a one-key unlocking and locking hydraulic supporting frame which comprises a three-cutting seat, a hydraulic handle and a hydraulic telescopic foot pipe. Each hydraulic telescopic foot pipe comprises a first foot pipe assembly, a second foot pipe assembly, a third foot pipe assembly, a fixing seat, a first sliding seat, a second sliding seat, a linkage rod, a first locking assembly, a second locking assembly, a hydraulic cylinder, a piston rod and a connecting rod, and the three hydraulic telescopic foot pipes are evenly distributed on the peripheral side of the three-cutting seat. The hydraulic handle is arranged on the three-cutting seat or the hydraulic telescopic foot tube and is connected with a hydraulic cylinder on the hydraulic telescopic foot tube; by means of the structure, simultaneous locking and simultaneous unlocking between the first foot pipe assembly and the second foot pipe assembly and between the second foot pipe assembly and the third foot pipe assembly can be achieved, then rapid folding and rapid unfolding of the supporting frame are achieved, the operation convenience and efficiency of the supporting frame are improved, and the use requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of photographic equipment, and in particular to a hydraulic support frame capable of being unlocked with one button. Background Art

[0002] Mobile phones and cameras (or tablet computers, laptops, etc.) are commonly used devices in people's daily life and work. In order to facilitate the use needs of some users for shooting, a support stand is used to support the shooting equipment during shooting, so as to free the user's hands. The support stand usually includes multiple support legs, and the support legs are retractable to adjust the height of the support stand. This retractable support leg has three sections of leg tubes, and a group of locking mechanisms are provided between two adjacent sections of leg tubes. Each group of locking mechanisms has an independent lock / unlock switch. Both groups of lock / unlock switches need to be turned on to unfold all the leg tubes on the support leg. If you want to unfold the entire support stand, you need to turn on 6 lock / unlock switches, which is extremely inconvenient to use. Therefore, there is an urgent need for a hydraulic support stand with one-button unlocking to solve the above problems. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hydraulic support frame with one-key unlocking.

[0004] An embodiment of the present invention solves the technical problem thereof by adopting a technical solution: a one-button unlocking hydraulic support frame, comprising a three-cut seat, a hydraulic handle and a hydraulic telescopic leg, the hydraulic telescopic leg comprising a first leg assembly, a second leg assembly, a third leg assembly, a fixed seat, a first sliding seat, a second sliding seat, a linkage rod, a first locking assembly, a second locking assembly, a hydraulic cylinder, a piston rod and a connecting rod, three hydraulic telescopic legs are provided and are evenly distributed around the three-cut seat, the hydraulic handle is mounted on the three-cut seat or the hydraulic telescopic leg and is connected to the hydraulic cylinder on the hydraulic telescopic leg; The fixed seat is arranged at the lower end of the first leg tube assembly, the first sliding seat is arranged at the lower end of the second leg tube assembly, the second sliding seat is arranged on the first leg tube assembly and connected to the upper end of the second leg tube assembly, and the third leg tube assembly is sleeved on the second leg tube assembly; The first locking assembly is arranged on the first sliding seat and connected to the third leg tube assembly, and the second locking assembly is arranged on the second sliding seat and connected to the first leg tube assembly; The linkage rod is connected between the first locking assembly and the second locking assembly; The hydraulic cylinder is arranged in a fixed seat, one end of the piston rod extends into the hydraulic cylinder, and the other end is provided with a slide groove, one end of the connecting rod is connected to the linkage rod, and the other end is movably arranged in the slide groove; The hydraulic cylinder can drive the linkage rod to rotate in the forward or reverse direction through the connecting rod when pushing the piston rod to reciprocate. The linkage rod can drive the first locking assembly and the second locking assembly to enter the locking position when rotating forward, so as to respectively limit the movement between the third leg tube assembly and the second leg tube assembly and limit the movement between the second leg tube assembly and the first leg tube assembly; or the linkage rod can drive the first locking assembly and the second locking assembly to the unlocking position when rotating reversely, so that the third leg tube assembly can move relative to the second leg tube assembly and the second leg tube assembly can move relative to the first leg tube assembly.

[0005] As one of the preferred embodiments of the present invention, an emergency release lock assembly connected to the connecting rod is provided on the fixing seat.

[0006] As one of the preferred embodiments of the present invention, the emergency release lock assembly includes a lever and a reset member, a lever groove connected to the outside is provided on the fixed seat, a limiting ring is provided on the linkage rod, one end of the lever is connected to the connecting rod and the other end extends into the lever groove, the reset member is sleeved on the linkage rod and one end abuts the connecting rod and the other end abuts the limit ring, the lever can drive the other end of the connecting rod to disengage from the sliding groove, so that the lever can drive the linkage rod to rotate forward or reverse.

[0007] As one of the preferred embodiments of the present invention, the cross-sectional profile of the linkage rod is set to be non-circular, and one end of the connecting rod is slidably sleeved on the linkage rod.

[0008] As one of the preferred embodiments of the present invention, the first locking assembly includes a driving gear, a driven gear sleeve and a pressing portion. The driving gear is connected to the lower end of the linkage rod, the driven gear sleeve is sleeved on the driving gear and threadedly connected to the driving gear, the pressing portion is arranged between the driven gear sleeve and the third leg tube assembly, the driven gear sleeve is provided with a first inclined surface, and the pressing portion is provided with a second inclined surface abutting the first inclined surface.

[0009] As one of the preferred embodiments of the present invention, the driven gear sleeve is connected to the first sliding seat through a guide structure.

[0010] As one of the preferred embodiments of the present invention, the guide structure includes a guide groove provided on the driven gear sleeve and arranged along the height direction thereof, and a guide block provided on the first sliding seat, the guide block extending into the guide groove.

[0011] As one of the preferred embodiments of the present invention, a fine-tuning screw is threadedly connected to the first sliding seat, and the guide block is composed of the fine-tuning screw, which is used to adjust the distance between the driven gear sleeve and the driving gear.

[0012] As one of the preferred embodiments of the present invention, the first leg tube assembly includes a first fixed tube and a second fixed tube, the second leg tube assembly includes a first telescopic tube and a second telescopic tube, and the third leg tube assembly includes a third telescopic tube and a fourth telescopic tube; The first telescopic tube and the second telescopic tube are arranged on the outside of the linkage rod; The first fixed tube and the second fixed tube are respectively arranged on the outsides of the first telescopic tube and the second telescopic tube; The third telescopic tube is inserted into the first telescopic tube, and the fourth telescopic tube is inserted into the second telescopic tube.

[0013] The beneficial effects of the present invention are as follows: a hydraulic support frame with one-button unlocking includes a three-cut seat, a hydraulic handle and a hydraulic telescopic leg tube. The hydraulic telescopic leg tube includes a first leg tube assembly, a second leg tube assembly, a third leg tube assembly, a fixed seat, a first sliding seat, a second sliding seat, a linkage rod, a first locking assembly, a second locking assembly, a hydraulic cylinder, a piston rod and a connecting rod. Three hydraulic telescopic leg tubes are provided and are evenly distributed on the circumference of the three-cut seat. The hydraulic handle is installed on the three-cut seat or the hydraulic telescopic leg tube and is connected to the hydraulic cylinder on the hydraulic telescopic leg tube; the hydraulic cylinder can drive the linkage rod to rotate in the forward or reverse direction through the connecting rod when pushing the piston rod to reciprocate, and the linkage rod can drive the first lock when rotating in the forward direction The locking mechanism can be adjusted so that the first and second locking mechanisms are adjusted so that the third leg assembly can be moved relative to the second leg assembly and the second leg assembly can be moved relative to the first leg assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of a hydraulic support frame with one-button unlocking in a first state; Figure 2 It is a structural schematic diagram of a hydraulic support frame with one-button unlocking in the second state; Figure 3 An exploded view of a hydraulic support frame with one-touch unlocking; Figure 4 for Figure 3 A partial enlarged view of area A in the middle; Figure 5 for Figure 3 A partial enlarged view of the middle B area; Figure 6 A schematic diagram of a partial structure of a hydraulic support frame with one-touch unlocking; Figure 7 This is an exploded view of the hydraulic handle; Figure 8 A cross-sectional view of the hydraulic handle. DETAILED DESCRIPTION

[0015] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0016] In the description of this invention, "above," "below," and "within" are understood to be exclusive of the number indicated. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0017] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0018] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection; and internal communication between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in the present invention based on the specific content of the technical solution.

[0019] Reference Figures 1 to 8, a hydraulic support frame with one-button unlocking, including a three-cut seat 480, a hydraulic handle 900 and a hydraulic telescopic leg tube, three hydraulic telescopic legs are provided and are evenly distributed on the circumference of the three-cut seat 480, the hydraulic handle 900 is installed on the three-cut seat 480 or the hydraulic telescopic leg tube and is connected to the hydraulic cylinder 450 on the hydraulic telescopic leg tube; wherein, each hydraulic telescopic leg tube includes a first leg tube assembly 100, a second leg tube assembly 200, a third leg tube assembly 300, a fixed seat 410, a first sliding seat 420, a second sliding seat 430, a linkage rod 440, a first locking assembly 500, a second locking assembly 600, a hydraulic cylinder 450, a piston rod 460 and a connecting rod 470; the fixed seat 410 is provided at the lower end of the first leg tube assembly 100, the first sliding seat 420 is provided at the At the lower end of the two-leg assembly 200, the second sliding seat 430 is arranged on the first leg assembly 100 and connected to the upper end of the second leg assembly 200, and the third leg assembly 300 is sleeved on the second leg assembly 200; the first locking assembly 500 is arranged on the first sliding seat 420 and connected to the third leg assembly 300, and the second locking assembly 600 is arranged on the second sliding seat 430 and connected to the first leg assembly 100; the linkage rod 440 is connected between the first locking assembly 500 and the second locking assembly 600; the hydraulic cylinder 450 is arranged in the fixed seat 410, one end of the piston rod 460 extends into the hydraulic cylinder 450, and the other end is provided with a slide groove 461, one end of the connecting rod 470 is connected to the linkage rod 440, and the other end is movably arranged in the slide groove 461.

[0020] Specifically, under normal conditions, the hydraulic handle 900 will drive the piston rod 460 on each hydraulic telescopic leg to be pushed out. During the process of pushing out the piston rod 460, since the slide groove 461 is provided on it and the other end of the connecting rod 470 is movably provided in the slide groove 461, the connecting rod 470 will rotate forward around the rotation center (linkage rod 440), thereby driving the first locking assembly 500 and the second locking assembly 600 to enter the locking position, respectively limiting the movement between the third leg tube assembly 300 and the second leg tube assembly 200 and limiting the movement between the second leg tube assembly 200 and the first leg tube assembly 100. At this time, The hydraulic telescopic legs can be kept in a folded state or in an extended state. When the hydraulic telescopic legs need to be unlocked, the hydraulic handle 900 is operated to drive the piston rods 460 on each hydraulic telescopic leg to retract. During the retraction of the piston rods 460, the connecting rod 470 will rotate in the opposite direction around the rotation center (linkage rod 440), thereby driving the first locking assembly 500 and the second locking assembly 600 into the unlocked position. The third leg assembly 300 can move relative to the second leg assembly 200, and the second leg assembly 200 can move relative to the first leg assembly 100. The three leg assemblies can be axially folded or axially extended.

[0021] Reference Figure 1-Figure 5In some embodiments, the first leg assembly 100 includes a first fixed tube 110 and a second fixed tube 120, the second leg assembly 200 includes a first telescopic tube 210 and a second telescopic tube 220, and the third leg assembly 300 includes a third telescopic tube 310 and a fourth telescopic tube 320; the first telescopic tube 210 and the second telescopic tube 220 are respectively arranged on the outside of the linkage rod 440; the first fixed tube 110 and the second fixed tube 120 are respectively arranged on the outside of the first telescopic tube 210 and the second telescopic tube 220; the third telescopic tube 310 is inserted into the first telescopic tube 210, and the fourth telescopic tube 320 is inserted into the second telescopic tube 220; specifically, the first locking assembly 500 is connected to the first sliding seat 420 ( The second leg assembly 200) and the third telescopic tube 310 and the fourth telescopic tube 320 can limit the relative movement between the third telescopic tube 310 and the fourth telescopic tube 320 and the first sliding seat 420, or release the restriction on the relative movement between the third telescopic tube 310 and the fourth telescopic tube 320 and the first sliding seat 420; the second locking assembly 600 is connected between the second sliding seat 430 (the second leg assembly 200) and the first fixed tube 110 and the second fixed tube 120, and can limit the relative movement between the first fixed tube 110 and the second fixed tube 120 and the first sliding seat 420, or release the restriction on the relative movement between the first fixed tube 110 and the second fixed tube 120 and the first sliding seat 420.

[0022] Reference Figure 1-Figure 5 In some embodiments, the hydraulic handle 900 includes a housing 910, an eight-way valve 920, an oil outlet cylinder 930, an oil return cylinder 940, and a trigger assembly 950; the eight-way valve 920 has a first oil inlet 921, three first oil outlets 922, three second oil inlets 923, and a second oil outlet 924, and the hydraulic cylinder 450 has a third oil inlet 451 and a third oil outlet 452. The three first oil outlets 922 and the three third oil inlets of the three hydraulic cylinders 450 are connected. The three second oil inlets 923 are connected one by one with the three third oil outlets 452 of the three hydraulic cylinders 450; the oil outlet cylinder body 930 has a second piston rod 931 and a fourth oil outlet 932 connected to the first oil inlet 921, and the oil return cylinder body 940 has a third piston rod 941 and a fourth oil inlet 942 connected to the second oil outlet 924; the trigger assembly 950 is pivotally connected to the housing 910 and connected to the second piston rod 931 and the third piston rod 941.

[0023] Specifically, when the trigger assembly 950 is rotated outward, the second piston rod 931 and the third piston rod 941 will be driven to move upward at the same time. Since the fourth oil outlet 932 is connected to the upper cylinder of the oil outlet cylinder body 930 and the fourth oil inlet 942 is connected to the lower cylinder body of the oil return cylinder body 940, the second piston rod 931 will squeeze the oil in the upper cylinder body of the oil cylinder body 930 out from the fourth oil outlet 932 and the third piston rod 941 will suck the oil back to the fourth oil inlet 942. The oil returns to the lower cylinder body of the oil return cylinder body 940, thereby forming a complete oil circuit circulation; further, the fourth oil outlet 932 enters the eight-way valve 920 through the first oil inlet 921, and is then provided to the third oil inlets 451 of the three hydraulic cylinders 460 from the three first oil outlets 922 respectively. The third oil outlets 452 of the three hydraulic cylinders 460 respectively flow back to the eight-way valve 920 through the three second oil inlets 923, and finally flow back to the oil return cylinder body 940 through the second oil outlet 924 and the fourth oil inlet 942.

[0024] Reference Figure 1-Figure 2 、 Figure 7-Figure 8 In some embodiments, a safety assembly 960 is provided between the housing 910 and the trigger assembly 950. The trigger assembly 950 includes a trigger 951 and a pull rod 952. A rotating shaft 953 is connected between one end of the trigger 951 and the housing 910. A pin 954 is connected to the middle section of the trigger 951. The other end of the trigger 951 extends outside the housing 910. A strip groove 955 is provided on the pull rod 952. The pin 954 is inserted into the strip groove 955. The second piston rod 931 and the third piston rod 941 are connected to the pull rod 952. The safety assembly 960 includes a safety pin. 961 and a second reset member (not shown in the figure), a clearance groove 962 is provided on the safety pin 961, and a contact platform 956 is provided on the pull rod 952. The second reset member abuts between the safety pin 961 and the shell 910. The trigger 951 is retracted inward to a locked state and unfolded outward to an unlocked state. The safety pin 961 moves inward to an unlocked state and moves outward to a locked state. The abutment platform 956 can enter the clearance groove 962 when the safety pin 961 moves inward, and the abutment platform 956 can abut against the lower end surface of the safety pin 961 when the safety pin 961 moves outward.

[0025] Reference Figures 1-6In some embodiments, an emergency unlocking lock assembly 700 connected to the connecting rod 470 is provided on the fixing seat 410; preferably, the emergency unlocking lock assembly 700 includes a shift rod 710 and a reset member 720, a shift groove 730 connected to the outside is provided on the fixing seat 410, and a limit ring 740 is provided on the linkage rod 440. One end of the shift rod 710 is connected to the connecting rod 470 and the other end extends into the shift groove 730. The reset member 720 is sleeved on the linkage rod 440 and one end abuts against the connecting rod 470 and the other end abuts against the limit ring 740. The shift rod 710 can drive the other end of the connecting rod 470 to disengage from the sliding groove 461, so that the shift rod 710 can drive the linkage rod 440 to rotate forward or reverse.

[0026] Specifically, when the hydraulic mechanism is working normally, the reset member 720 will push the connecting rod 470 toward the piston rod 460, so that the other end of the connecting rod 470 extends into the sliding groove 461 on the piston rod 460, so that the hydraulic mechanism can drive the linkage rod 440 to move in the forward or reverse direction by driving the piston rod 460 and the connecting rod 470 to move; when the hydraulic mechanism fails, the other end of the connecting rod 470 can be driven to disengage from the sliding groove 461 on the piston rod 460 by operating the dial rod 710. At this time, driving the dial rod 710 can directly drive the linkage rod 440 to move in the forward or reverse direction, thereby realizing manual unlocking of the hydraulic telescopic leg.

[0027] Reference Figures 1-6 In some embodiments, the cross-sectional profile of the linkage rod 440 is set to be non-circular, one end of the connecting rod 470 is slidably mounted on the linkage rod 440, and a through groove 471 adapted to the linkage rod 440 is provided on the connecting rod 470. The linkage rod 440 is passed through the through groove 471, so that the connecting rod 470 can rotate synchronously with the linkage rod 440 and can also slide axially relative to the linkage rod 440.

[0028] Reference Figures 1-6In some embodiments, the first locking assembly 500 includes a driving gear 510, a driven gear sleeve 520 and a pressing portion 530. The driving gear 510 is connected to the lower end of the linkage rod 440. The driven gear sleeve 520 is sleeved on the driving gear 510 and is threadedly connected to the driving gear 510. The pressing portion 530 is arranged between the driven gear sleeve 520 and the third leg tube assembly 300. The driven gear sleeve 520 is provided with a first inclined surface 540, and the pressing portion 530 is provided with a second inclined surface 550 that abuts against the first inclined surface 540. Further, the pressing portion 530 includes a first top block 531 and a second top block 532. The first top block 531 and the second top block 532 are respectively arranged on both sides of the driven gear sleeve 520. When the linkage rod 440 rotates, the driving gear 510 is driven to rotate. Through the threaded connection between the driving gear 510 and the driven gear sleeve 520 and the guide limit between the driven gear sleeve 520 and the first sliding seat 420, the rotational motion of the linkage rod 440 and the driving gear 510 is converted into the linear motion of the driven gear sleeve 520, thereby pushing the first and second top blocks 531 and 532 to press against the third and fourth telescopic tubes 310 and 320 respectively, or releasing the squeezing effect on the first and second top blocks 531 and 532. Figure 3 and Figure 5 The second locking assembly 600 may adopt the same structure as the first locking assembly 500, which will not be described in detail here and shall not be considered as a limitation to the present invention.

[0029] Reference Figures 1-6 In some embodiments, the driven gear sleeve 520 is connected to the first sliding seat 420 through a guide structure 800. Preferably, the guide structure 800 includes a guide groove 810 provided on the driven gear sleeve 520 and arranged along its height direction, and a guide block 820 provided on the first sliding seat 420, and the guide block 820 extends into the guide groove 810.

[0030] Reference Figure 3-Figure 4 In some embodiments, a fine-tuning screw 830 is threadedly connected to the first sliding seat 420, and the guide block 820 is composed of the fine-tuning screw 830, which is used to adjust the distance between the driven gear sleeve 520 and the driving gear 510; due to the processing accuracy of parts, assembly errors, wear and tear, etc., the pressing effect of the pressing part 530 on the third telescopic tube 310 and the fourth telescopic tube 320 will be weakened. At this time, the fine-tuning screw 830 can be removed, and then the driven gear sleeve 520 can be moved to make the driven gear sleeve 520 threadably rotate relative to the driving gear 510, thereby changing the relative position between the driven gear sleeve 520 and the pressing part 530, and then changing the degree of contact between the driven gear sleeve 520 and the pressing part 530, that is, adjusting the tightness.

[0031] The advantage of the present invention is that: through the above structure, simultaneous locking and unlocking can be achieved between the first leg tube assembly and the second leg tube assembly, and between the second leg tube assembly and the third leg tube assembly, thereby achieving rapid folding and rapid deployment of the support frame, improving the operating convenience and efficiency of the support frame, and meeting usage requirements.

[0032] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A hydraulic support frame with one-button unlocking, characterized by: The invention comprises a three-cutting base (480), a hydraulic handle (900) and a hydraulic telescopic leg tube, wherein the hydraulic telescopic leg tube comprises a first leg tube assembly (100), a second leg tube assembly (200), a third leg tube assembly (300), a fixed base (410), a first sliding base (420), a second sliding base (430), a linkage rod (440), a first locking assembly (500), a second locking assembly (600), a hydraulic cylinder (450), a piston rod (460) and a connecting rod (470), three hydraulic telescopic leg tubes are provided and are evenly distributed on the circumference of the three-cutting base (480), and the hydraulic handle (900) is installed on the three-cutting base (480) or the hydraulic telescopic leg tube and is connected to the hydraulic cylinder (450) on the hydraulic telescopic leg tube; The fixed seat (410) is arranged at the lower end of the first leg tube assembly (100), the first sliding seat (420) is arranged at the lower end of the second leg tube assembly (200), the second sliding seat (430) is arranged on the first leg tube assembly (100) and connected to the upper end of the second leg tube assembly (200), and the third leg tube assembly (300) is sleeved on the second leg tube assembly (200); The first locking assembly (500) is arranged on the first sliding seat (420) and connected to the third leg tube assembly (300), and the second locking assembly (600) is arranged on the second sliding seat (430) and connected to the first leg tube assembly (100); The linkage rod (440) is connected between the first locking assembly (500) and the second locking assembly (600); The hydraulic cylinder (450) is arranged in the fixing seat (410), one end of the piston rod (460) extends into the hydraulic cylinder (450), and the other end is provided with a slide groove (461), one end of the connecting rod (470) is connected to the linkage rod (440), and the other end is movably arranged in the slide groove (461); The hydraulic cylinder (450) can drive the linkage rod (440) to rotate in a positive or negative direction through the connecting rod (470) when pushing the piston rod (460) to reciprocate, and the linkage rod (440) can drive the first locking assembly (500) and the second locking assembly (600) to enter a locking position when rotating in the positive direction, so as to respectively limit the movement between the third leg tube assembly (300) and the second leg tube assembly (200) and limit the movement between the second leg tube assembly (200) and the first leg tube assembly (100); Alternatively, the linkage rod (440) can drive the first locking assembly (500) and the second locking assembly (600) into an unlocking position when rotating in the reverse direction, so that the third leg tube assembly (300) can move relative to the second leg tube assembly (200) and the second leg tube assembly (200) can move relative to the first leg tube assembly (100).

2. The one-touch unlocking hydraulic support frame according to claim 1, characterized in that: An emergency unlocking and locking assembly (700) connected to the connecting rod (470) is provided on the fixing seat (410).

3. The one-touch unlocking hydraulic support frame according to claim 2, characterized in that: The emergency unlocking lock assembly (700) includes a shifting rod (710) and a reset member (720), the fixed seat (410) is provided with a shifting groove (730) connected to the outside, and the linkage rod (440) is provided with a limit ring (740), one end of the shifting rod (710) is connected to the linkage rod (470), and the other end extends into the shifting groove (730), the reset member (720) is sleeved on the linkage rod (440) and one end abuts against the linkage rod (470) and the other end abuts against the limit ring (740), the shifting rod (710) can drive the other end of the linkage rod (470) to disengage from the sliding groove (461), so that the shifting rod (710) can drive the linkage rod (440) to rotate forward or reverse.

4. The one-touch unlocking hydraulic support frame according to claim 1, characterized in that: The cross-sectional profile of the linkage rod (440) is configured to be non-circular, and one end of the connecting rod (470) is slidably sleeved on the linkage rod (440).

5. The one-touch unlocking hydraulic support frame according to claim 1, characterized in that: The first locking assembly (500) comprises a driving gear (510), a driven gear sleeve (520) and a pressing portion (530), wherein the driving gear (510) is connected to the lower end of the linkage rod (440), the driven gear sleeve (520) is sleeved on the driving gear (510) and is threadedly connected to the driving gear (510), and the pressing portion (530) is arranged between the driven gear sleeve (520) and the third leg tube assembly (300), the driven gear sleeve (520) is provided with a first inclined surface (540), and the pressing portion (530) is provided with a second inclined surface (550) abutting against the first inclined surface (540).

6. The one-touch unlocking hydraulic support frame according to claim 5, characterized in that: The driven gear sleeve (520) is connected to the first sliding seat (420) via a guide structure (800).

7. The one-touch unlocking hydraulic support frame according to claim 6, characterized in that: The guide structure (800) comprises a guide groove (810) provided on the driven gear sleeve (520) and arranged along its height direction, and a guide block (820) provided on the first sliding seat (420), wherein the guide block (820) extends into the guide groove (810).

8. The one-touch unlocking hydraulic support frame according to claim 7, characterized in that: A fine-tuning screw (830) is threadedly connected to the first sliding seat (420), and the guide block (820) is composed of the fine-tuning screw (830) and is used to adjust the distance between the driven gear sleeve (520) and the driving gear (510).

9. The one-touch unlocking hydraulic support frame according to claim 1, characterized in that: The first leg tube assembly (100) includes a first fixed tube (110) and a second fixed tube (120); the second leg tube assembly (200) includes a first telescopic tube (210) and a second telescopic tube (220); and the third leg tube assembly (300) includes a third telescopic tube (310) and a fourth telescopic tube (320); The first telescopic tube (210) and the second telescopic tube (220) are arranged on the outside of the linkage rod (440); The first fixed tube (110) and the second fixed tube (120) are respectively arranged on the outside of the first telescopic tube (210) and the second telescopic tube (220); The third telescopic tube (310) is inserted into the first telescopic tube (210), and the fourth telescopic tube (320) is inserted into the second telescopic tube (220).

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