CN112923215A

CN112923215A - Portable folding camera tripod

Info

Publication number: CN112923215A
Application number: CN202110273897.5A
Authority: CN
Inventors: 叶文静; 王思雅
Original assignee: Caimo Mulong Hangzhou Film And Television Production Co ltd
Current assignee: Caimo Mulong Hangzhou Film And Television Production Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-06-08

Abstract

The invention relates to a portable folding camera tripod, which belongs to the technical field of tripods, and adopts the technical scheme that the tripod comprises a tripod head, wherein the tripod head is arranged on the lower side of the tripod head, a lifting rod is vertically arranged on the tripod head, a horizontal rotating assembly is arranged at the top of the lifting rod, a pitching angle adjusting assembly is arranged on the upper side of the horizontal rotating assembly, and a mounting platform for fixing a camera is arranged on the upper side of the pitching angle adjusting assembly; a positioning assembly for adjusting the rotation angle of the tripod is arranged between the tripod and the lifting rod, and a moving device for driving the tripod to move is arranged on the lower side of the tripod; the tripod comprises a sleeve which is arranged on the lower side of the tripod head at an equal angle, wherein one end of the sleeve, which is far away from the tripod head, is provided with a telescopic pipe fitting, and a fine adjustment assembly for adjusting the relative sliding between the telescopic pipe fitting and the sleeve is arranged on the sleeve. Through adopting above-mentioned technical scheme, can finely tune cloud platform height, angle after the installation camera, and tripod relatively stable in the accommodation process uses safelyr.

Description

Portable folding camera tripod

Technical Field

The invention belongs to the technical field of tripods, and particularly relates to a portable folding camera tripod.

Background

A camera is an apparatus for forming an image using an optical imaging principle and recording the image using a negative film, and is an optical instrument for photographing. In modern social life, there are many devices capable of recording images, all of which have the characteristics of cameras, such as medical imaging devices, astronomical observation devices, etc., cameras are often fixed by using tripods to achieve certain photographic effects, and existing cameras are generally matched with the tripods to shoot when in use.

The camera tripod in the prior art comprises a tripod head and three telescopic supporting legs arranged on one side of the tripod head, wherein the three telescopic supporting legs can be adjusted in a telescopic mode. When using, the general condition is at first to adjust three telescopic leg, later installs the camera in cloud platform upside, in the use, because after telescopic leg's fastener loosens, the cloud platform atress is unstable, consequently can not finely tune the cloud platform height in the use.

Disclosure of Invention

In view of the problems in the prior art, an object of the present invention is to provide a portable foldable camera tripod, which can finely adjust the height and angle of the tripod head after a camera is installed, and is relatively stable and safer to use during the adjustment process.

In order to achieve the above object, the present invention provides a technical solution as follows:

a portable folding camera tripod comprises a tripod head, wherein a tripod is arranged on the lower side of the tripod head, a lifting rod is vertically arranged on the tripod head, a horizontal rotating assembly is arranged at the top of the lifting rod, a pitching angle adjusting assembly is arranged on the upper side of the horizontal rotating assembly, and a mounting platform for fixing a camera is arranged on the upper side of the pitching angle adjusting assembly; a positioning assembly for adjusting the rotation angle of the tripod is arranged between the tripod and the lifting rod, and a moving device for driving the tripod to move is arranged on the lower side of the tripod; the tripod comprises a sleeve which is arranged on the lower side of the tripod head at an equal angle, wherein one end of the sleeve, which is far away from the tripod head, is provided with a telescopic pipe, and the sleeve is provided with a fine adjustment assembly for adjusting the relative sliding of the telescopic pipe and the sleeve.

Preferably, the inner side of the sleeve is provided with a telescopic hole along the length direction; the section of the sleeve is in an oblong shape, a through operating groove is formed in the sleeve and communicated with the telescopic hole, and the section of the operating groove is rectangular; the fine adjustment subassembly is including being located adjusting screw in the flexible downthehole and being located operating groove's adjusting nut, adjusting nut with adjusting screw threaded connection, adjusting screw one end with flexible pipe connection.

Preferably, the telescopic pipe fitting comprises a first connecting pipe, a second connecting pipe and a supporting rod, one end of the first connecting pipe is connected in the telescopic hole in a sliding mode and is fixedly connected with the adjusting screw rod; the other end is sleeved outside the second connecting pipe; one end of the supporting rod is connected in the second connecting pipe in a sliding mode, and the other end of the supporting rod is provided with a supporting base; locking parts for respectively locking the first connecting pipe, the second connecting pipe and the supporting rod are respectively arranged at the lower end of the sleeve, the lower end of the first connecting pipe and the lower end of the second connecting pipe.

Preferably, the sleeve, the first connecting pipe and the second connecting pipe are respectively provided with a locking port; the retaining member including rotate connect in the buckle of locking mouth one side, the buckle is close to a side integrated into one piece of locking mouth has the compact heap, when the buckle rotates, the compact heap can insert compress tightly with first connecting pipe, second connecting pipe or bracing piece in the locking mouth.

Preferably, the supporting base comprises a rotary sphere fixed at the bottom of the supporting rod, and an abutting outer sleeve is rotatably arranged on the outer side of the rotary sphere.

Preferably, the mobile device includes the mounting panel, follows the three telescopic link of group of the equal angle setting of mounting panel circumference side, telescopic link keeps away from the one end of mounting panel and is provided with the universal wheel respectively, telescopic link upside is provided with respectively it is right to support the base and carry out the fixed centre gripping subassembly of centre gripping.

Preferably, the telescopic connecting rod comprises a third connecting pipe connected with the mounting plate and a connecting rod connected in the third connecting pipe in a sliding manner, and the universal wheel is arranged at the free end part of the connecting rod; the clamping assembly comprises a first clamping block and an installation block which are fixed on the connecting rod, a threaded rod is connected to the installation block in a threaded manner, one end, close to the first clamping block, of the threaded rod is rotatably connected with a second clamping block, and a clamping knob is arranged at the other end of the threaded rod; and an arc-shaped groove is formed in one end, close to each other, of the first clamping block and the second clamping block.

Preferably, the cradle head is provided with an operation assembly for controlling the lifting rod to lift along the vertical direction.

Preferably, the cradle head is provided with a vertical limiting hole, the lifting rod is connected in the limiting hole in a sliding manner, the inner side of the cradle head is provided with an operation cavity, and the operation cavity is communicated with the limiting hole; the holder is provided with a locking piece for locking or unlocking the lifting rod;

the operating assembly comprises a rotating rod which is rotatably connected to the holder, one end of the rotating rod is positioned outside the holder and is connected with an operating rod, and the other end of the rotating rod is positioned in the operating cavity and is provided with a gear; and one side of the lifting rod, which is close to the operation cavity, is provided with a mounting groove, the length direction of the mounting groove is parallel to the length direction of the lifting rod, a rack is arranged in the mounting groove, and the rack is meshed with the gear.

According to the portable folding camera tripod provided by the invention, the height of the tripod head can be preliminarily adjusted by operating the telescopic pipe fitting and the operation assembly, after the camera is fixed, the height and the angle of the tripod head can be continuously adjusted by operating the fine adjustment assembly, the camera is more stable in the adjustment process, the height of the camera can be flexibly and finely adjusted in the shooting process, the use is more convenient and flexible, in addition, when the position needs to be moved, the tripod is placed on the moving device to move, the camera is prevented from being detached, and the shooting can be carried out in the moving process.

Drawings

FIG. 1 is a schematic structural view of a portable folding camera tripod according to the present invention;

FIG. 2 is a schematic view of a projecting tripod of a portable folding camera tripod according to the present invention;

FIG. 3 is a cross-sectional view of a projecting tripod of a portable folding camera tripod according to the present invention;

FIG. 4 is a cross-sectional view of a projecting support base of a portable folding camera tripod according to the present invention;

FIG. 5 is a schematic view of a protruding locking member of a portable folding camera tripod according to the present invention;

FIG. 6 is a schematic view of a projecting mobile device of a portable folding camera tripod according to the present invention;

FIG. 7 is a schematic view of a projecting clamp assembly in a portable folding camera tripod according to the present invention;

FIG. 8 is a schematic view of a protruding operating component of a portable folding camera tripod according to the present invention.

Reference numbers in the figures:

100. a holder; 110. a limiting hole; 120. an operating cavity; 130. a locking member; 131. locking the screw rod; 132. a locking knob;

200. a tripod;

210. a sleeve; 211. a telescopic hole; 212. an operation slot; 213. a locking port;

220. a telescopic pipe fitting; 221. a first connecting pipe; 222. a second connecting pipe; 223. a support bar;

230. a fine adjustment component; 231. adjusting the screw rod; 232. adjusting the nut;

240. a support base; 241. rotating the sphere; 242. abutting against the outer sleeve;

250. a locking member; 251. buckling the plate; 252. a compression block;

300. a lifting rod; 310. mounting grooves;

400. a mobile device; 410. mounting a plate; 420. a telescopic connecting rod; 421. a third connecting pipe; 422. a connecting rod; 430. a universal wheel; 440. a clamping assembly; 441. a first clamping block; 442. mounting blocks; 443. a threaded rod; 444. a second clamping block; 445. a clamping knob;

500. an operating component; 510. rotating the rod; 520. an operating lever; 530. a gear; 540. a rack.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The invention provides a portable folding camera tripod, which is shown in the figures 1-8 and comprises a tripod head 100, wherein a tripod 200 is arranged at the lower side of the tripod head 100, a lifting rod 300 is vertically arranged on the tripod head 100, a horizontal rotating component is arranged at the top of the lifting rod 300, a pitching angle adjusting component is arranged at the upper side of the horizontal rotating component, and a mounting platform for fixing a camera is arranged at the upper side of the pitching angle adjusting component; be provided with the locating component who adjusts tripod 200 turned angle between tripod 200 and lifter 300, when using, prop open tripod 200 and support, fix the camera at the mounting platform upside, the pitch angle through pitch angle adjusting component regulation camera, the horizontal angle through horizontal rotation subassembly regulation camera, wherein, pitch angle adjusting component and horizontal rotation subassembly all adopt prior art, the purpose is pitch angle and the horizontal angle of adjusting the camera, locating component is used for adjusting tripod 200's the angle that opens, as long as can reach the purpose of adjusting above-mentioned angle among the prior art promptly.

Further, a moving device 400 for moving the tripod 200 is disposed at a lower side of the tripod 200, and the tripod 200 is moved by the moving device 400. The tripod 200 includes a sleeve 210 disposed at the lower side of the tripod head 100 at an equal angle, a telescopic pipe 220 is disposed at one end of the sleeve 210 far from the tripod head 100, wherein the length of the telescopic pipe 220 can be adjusted, and a fine adjustment assembly 230 for adjusting the relative sliding between the telescopic pipe 220 and the sleeve 210 is disposed on the sleeve 210. The horizontal degree and height of the pan/tilt head 100 can be finely adjusted by the fine adjustment assembly 230.

Specifically, the inner side of the sleeve 210 is provided with a telescopic hole 211 along the length direction; the section of the sleeve 210 is oblong, a through operation groove 212 is formed in the sleeve 210, the operation groove 212 is communicated with the telescopic hole 211, and the section of the operation groove 212 is rectangular.

The fine adjustment assembly 230 comprises an adjusting screw 231 located in the telescopic hole 211 and an adjusting nut 232 located in the operating slot 212, the adjusting nut 232 is in threaded connection with the adjusting screw 231, and one end of the adjusting screw 231 is connected with the telescopic pipe 220. When the adjusting screw rod 231 is installed, the adjusting nut 232 is placed into the operating groove 212 from the outside, and the adjusting screw rod 231 is inserted into one end of the telescopic hole 211 and is in threaded connection with the adjusting nut 232. After the installation, the adjusting screw 231 can be controlled to slide in the telescopic hole 211 by rotating the adjusting nut 232 from the outside. In the sliding process, the telescopic pipe 220 is driven to move.

The telescopic pipe 220 comprises a first connecting pipe 221, a second connecting pipe 222 and a support rod 223, wherein one end of the first connecting pipe 221 is slidably connected in the telescopic hole 211 and is fixedly connected with the adjusting screw 231; the other end is sleeved outside the second connecting pipe 222; one end of the support rod 223 is slidably connected to the second connection tube 222, and the other end is provided with a support base 240.

Wherein, the diameter of first connecting pipe 221 is greater than adjusting screw 231's diameter, and in the use, the outside of first connecting pipe 221 and flexible hole 211 inner wall butt, and relative slip, and then guarantee the stability of first connecting pipe 221 in the use.

Locking members 250 for locking the first connection pipe 221, the second connection pipe 222 and the support bar 223 are respectively provided at the lower end of the sleeve 210, the lower end of the first connection pipe 221, and the lower end of the second connection pipe 222. That is, the three sets of locking members 250 may respectively lock the socket 210 with the first connection pipe 221, the first and

second connection pipes

221 and 222, and the second connection pipe 222 and the support bar 223. After locking, the three groups of pipe fittings are kept fixed and can not slide relatively.

Specifically, the sleeve 210, the first connection pipe 221, and the second connection pipe 222 are respectively provided with a locking port 213.

The locking member 250 includes a locking plate 251 rotatably connected to one side of the locking port 213, a pressing block 252 is integrally formed on one side of the locking plate 251 adjacent to the locking port 213, and when the locking plate 251 rotates, the pressing block 252 may be inserted into the locking port 213 to be pressed against the first connecting pipe 221, the second connecting pipe 222 or the support rod 223. When the pinch plate 251 is disposed on the sleeve 210, when the pinch plate 251 rotates, the pressing block 252 may abut against the outer wall of the first connection pipe 221, and when abutting against the outer wall, the position between the first connection pipe 221 and the sleeve 210 is relatively fixed. Through setting up retaining member 250 on sleeve pipe 210, in the use, when needs adjust, can open retaining member 250, operation fine-tuning subassembly 230 adjusts, and after the regulation, retaining member 250 closed has guaranteed the stability of first connecting pipe 221.

The support base 240 includes a rotary sphere 241 fixed to the bottom of the support rod 223, and a contact outer cover 242 is rotatably provided outside the rotary sphere 241. The contact outer sleeve 242 and the rotary sphere 241 are in contact with each other, and when a certain external force is applied, the rotary sphere 241 and the contact outer sleeve 242 can rotate relatively. With this arrangement, the stability of contact between the outer jacket 242 and the ground can be ensured to some extent.

The moving device 400 includes a mounting plate 410, and three sets of telescopic links 420 arranged at equal angles along the circumferential side of the mounting plate 410, wherein one ends of the telescopic links 420 far away from the mounting plate 410 are respectively provided with a universal wheel 430, and the upper sides of the telescopic links 420 are respectively provided with a clamping assembly 440 for clamping and fixing the support base 240.

The telescopic link 420 includes a third connection pipe 421 connected to the mounting plate 410, and a connection rod 422 slidably connected to the inside of the third connection pipe 421, and the universal wheel 430 is disposed at a free end of the connection rod 422.

The clamping assembly 440 is located on the upper side of the connecting rod 422 and the universal wheel 430 is located on the lower side of the connecting rod 422. The clamping assembly 440 comprises a first clamping block 441 fixed on the connecting rod 422 and a mounting block 442, a threaded rod 443 is screwed on the mounting block 442, the threaded rod 443 penetrates through the mounting block 442, a second clamping block 444 is rotatably connected to one end of the threaded rod 443 close to the first clamping block 441, and a clamping knob 445 is arranged at the other end; the ends of the first and second clamping blocks 441 and 444 adjacent to each other are provided with an arc-shaped slot. In use, the clamping knob 445 may be selected to control the rotation of the threaded rod 443, which in turn drives the second clamping block 444 to move, during which the first and second clamping blocks 441, 444 may clamp the support base 240.

An operation assembly 500 for controlling the elevation of the elevation rod 300 in the vertical direction is provided on the pan/tilt head 100. The lifting rod 300 can be more conveniently controlled to be lifted in the vertical direction by the operation assembly 500.

Specifically, the cradle head 100 is provided with a vertical limiting hole 110, the lifting rod 300 is slidably connected in the limiting hole 110, the inner side of the cradle head 100 is provided with an operation cavity 120, and the operation cavity 120 is communicated with the limiting hole 110; the cradle head 100 is provided with a locking member 130 for locking and unlocking the lift lever 300.

Wherein, the outer sidewall of the lifting rod 300 is abutted against the inner wall of the limiting hole 110, and the lifting rod 300 cannot freely slide down when the locking member 130 is unscrewed under a certain friction force.

The locking member 130 includes a locking screw 131 threadedly coupled to the cradle head 100, a locking knob 132 coupled to an outer end of the locking screw 131, and the other end of the locking screw 132 can extend into the limiting hole 110, and when the locking knob 132 controls the locking screw 131 to rotate into the limiting hole 110, the locking screw can abut against the lifting rod 300.

The operating assembly 500 comprises a rotating rod 510 rotatably connected to the cradle head 100, one end of the rotating rod 510 is located outside the cradle head 100 and is connected with an operating rod 520, and the other end is located in the operating cavity 120 and is provided with a gear 530; a mounting groove 310 is formed at one side of the elevating rod 300 adjacent to the operation cavity 120, the length direction of the mounting groove 310 is parallel to the length direction of the elevating rod 300, a rack 540 is disposed in the mounting groove 310, and the rack 540 is engaged with the gear 530. When the height of the lifting rod 300 needs to be adjusted, the operation rod 520 is controlled to rotate, and then the gear 530 is driven to rotate, so that the operation rod 520 is driven to slide up and down along the vertical direction.

When using, tentatively adjust cloud platform 100 height through operation telescopic pipe spare 220, simultaneously, go up and down through operation subassembly 500 drive lifter 300, and then adjust cloud platform 100's height, later fix the camera on cloud platform 100, can continuously adjust cloud platform 100's height and angle through operation fine tuning subassembly 230, in accommodation process, the camera is more stable, and can be at the height of the nimble fine setting camera of shooting in-process, it is more convenient to use, in a flexible way, in addition, when needs shift position, place tripod 200 and remove on mobile device 400, remove and practice thrift the manpower more.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A portable folding camera tripod comprises a tripod head (100), wherein a tripod (200) is arranged on the lower side of the tripod head (100), a lifting rod (300) is vertically arranged on the tripod head (100), a horizontal rotating assembly is arranged at the top of the lifting rod (300), a pitching angle adjusting assembly is arranged on the upper side of the horizontal rotating assembly, and a mounting platform for fixing a camera is arranged on the upper side of the pitching angle adjusting assembly; be provided with between tripod (200) and lifter (300) and adjust tripod (200) turned angle's locating component, its characterized in that:

a moving device (400) for driving the tripod (200) to move is arranged on the lower side of the tripod (200);

the tripod (200) comprises a sleeve (210) which is arranged on the lower side of the tripod head (100) at an equal angle, one end, far away from the tripod head (100), of the sleeve (210) is provided with a telescopic pipe fitting (220), and the sleeve (210) is provided with a fine adjustment assembly (230) for adjusting the relative sliding between the telescopic pipe fitting (220) and the sleeve (210).

2. The portable folding camera tripod of claim 1, wherein: the inner side of the sleeve (210) is provided with a telescopic hole (211) along the length direction;

the section of the sleeve (210) is oblong, a through operating groove (212) is formed in the sleeve (210), the operating groove (212) is communicated with the telescopic hole (211), and the section of the operating groove (212) is rectangular;

the fine adjustment assembly (230) comprises an adjusting screw rod (231) located in the telescopic hole (211) and an adjusting nut (232) located in the operation groove (212), the adjusting nut (232) is in threaded connection with the adjusting screw rod (231), and one end of the adjusting screw rod (231) is connected with the telescopic pipe fitting (220).

3. The portable folding camera tripod of claim 1, wherein: the telescopic pipe fitting (220) comprises a first connecting pipe (221), a second connecting pipe (222) and a supporting rod (223), wherein one end of the first connecting pipe (221) is connected in the telescopic hole (211) in a sliding mode and is fixedly connected with the adjusting screw rod (231); the other end is sleeved outside the second connecting pipe (222);

one end of the support rod (223) is connected in a sliding way in the second connecting pipe (222), and the other end is provided with a support base (240);

locking pieces (250) for respectively locking the first connecting pipe (221), the second connecting pipe (222) and the support rod (223) are respectively arranged at the lower end of the sleeve (210), the lower end of the first connecting pipe (221) and the lower end of the second connecting pipe (222).

4. The portable folding camera tripod of claim 1, wherein: the sleeve (210), the first connecting pipe (221) and the second connecting pipe (222) are respectively provided with a locking port (213);

the locking piece (250) comprises a buckle plate (251) rotatably connected to one side of the locking port (213), a pressing block (252) is integrally formed on one side of the buckle plate (251) close to the locking port (213), and when the buckle plate (251) rotates, the pressing block (252) can be inserted into the locking port (213) to be pressed with the first connecting pipe (221), the second connecting pipe (222) or the supporting rod (223).

5. The portable folding camera tripod of claim 3, wherein: the supporting base (240) comprises a rotary sphere (241) fixed at the bottom of the supporting rod (223), and an abutting outer sleeve (242) is rotatably arranged on the outer side of the rotary sphere (241).

6. The portable folding camera tripod of claim 3, wherein: the mobile device (400) comprises a mounting plate (410), three groups of telescopic connecting rods (420) arranged at equal angles on the circumferential side of the mounting plate (410), universal wheels (430) are respectively arranged at one ends of the telescopic connecting rods (420) far away from the mounting plate (410), and the upper sides of the telescopic connecting rods (420) are respectively provided with a clamping component (440) which is used for clamping and fixing the supporting base (240).

7. The portable folding camera tripod of claim 6, wherein: the telescopic connecting rod (420) comprises a third connecting pipe (421) connected with the mounting plate (410) and a connecting rod (422) connected in the third connecting pipe (421) in a sliding manner, and the universal wheel (430) is arranged at the free end part of the connecting rod (422);

the clamping assembly (440) comprises a first clamping block (441) and a mounting block (442) which are fixed on the connecting rod (422), a threaded rod (443) is connected to the mounting block (442) in a threaded manner, one end, close to the first clamping block (441), of the threaded rod (443) is rotatably connected with a second clamping block (444), and the other end of the threaded rod is provided with a clamping knob (445); the first clamping block (441) and the second clamping block (444) are provided with arc-shaped grooves at the ends close to each other.

8. The portable folding camera tripod of claim 1, wherein: an operation component (500) for controlling the lifting rod (300) to lift along the vertical direction is arranged on the cloud deck (100).

9. The portable folding camera tripod of claim 8, wherein: the cradle head (100) is provided with a vertical limiting hole (110), the lifting rod (300) is connected in the limiting hole (110) in a sliding manner, the inner side of the cradle head (100) is provided with an operation cavity (120), and the operation cavity (120) is communicated with the limiting hole (110); a locking piece (130) for locking or unlocking the lifting rod (300) is arranged on the cloud deck (100);

the operating assembly (500) comprises a rotating rod (510) which is rotatably connected to the holder (100), one end of the rotating rod (510) is positioned outside the holder (100) and is connected with an operating rod (520), and the other end of the rotating rod is positioned in the operating cavity (120) and is provided with a gear (530); an installation groove (310) is formed in one side, close to the operation cavity (120), of the lifting rod (300), the length direction of the installation groove (310) is parallel to the length direction of the lifting rod (300), a rack (540) is arranged in the installation groove (310), and the rack (540) is meshed with the gear (530).