CN112066199A - Projector base for holographic projection technology - Google Patents

Projector base for holographic projection technology Download PDF

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Publication number
CN112066199A
CN112066199A CN202010906806.2A CN202010906806A CN112066199A CN 112066199 A CN112066199 A CN 112066199A CN 202010906806 A CN202010906806 A CN 202010906806A CN 112066199 A CN112066199 A CN 112066199A
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CN
China
Prior art keywords
base
vibration
damping device
sleeve
projector
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Granted
Application number
CN202010906806.2A
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Chinese (zh)
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CN112066199B (en
Inventor
不公告发明人
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Shenzhen Latitude Audio Visual Technology Co ltd
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Fu Jinming
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Publication of CN112066199A publication Critical patent/CN112066199A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/20—Undercarriages with or without wheels
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

The invention relates to the technical field of holographic projection, and discloses a base which is annular and is uniformly and fixedly provided with four top contacts on the inner wall, the inner ring of the base is movably sleeved with a vibration damper through a top contact, the top of the vibration damper is movably sleeved with a sleeve, a rotating shaft is movably arranged at the top of the sleeve, holographic projectors are fixedly connected with both ends of the rotating shaft, a cylindrical groove is arranged in the top contact sleeved by the vibration damping device, one end of the top contact sleeved in the cylindrical groove is fixedly connected with a safety spring, one end of the safety spring, which is far away from the top contact, is fixedly connected with a piston, the middle part inside the vibration damper is movably sleeved with a vibration damping block, the bottom of the vibration damping block is positioned in the cylindrical groove, can cup joint with the sleeve activity through the damping device who sets up, can conveniently dismantle and carry holographic projector and can also avoid the vibration influence in the use.

Description

Projector base for holographic projection technology
Technical Field
The invention relates to the technical field of holographic projection, in particular to a projector base based on holographic projection technology.
Background
The holographic projection technology is a 3D projection technology which is very popular nowadays, and can project a 3D image compared with a previous projector, so that people can watch a more real experience, the holographic projection technology is a holographic projector which uses diffraction imaging of light, and many people and families can buy the holographic projector for use at present, but the existing holographic projector is not perfect enough, and some problems exist:
1. most of the existing portable holographic projectors are very small and do not have structures such as a bracket base and the like, and the portable holographic projectors are directly placed when used, but the portable holographic projectors are convenient to carry, but cannot be adjusted when placed on a plane due to the loss of the support of the structures such as the base and the like in use, and the projection range is limited;
2. the projecting apparatus can not receive undulant in the use, and undulant can influence the effect of projecting away, leads to the formation of image blur and rocks, and current just carry out the damping at the vertical spring of base internally mounted when carrying out the damping, and the vibration is not all from vertical direction, still has the vibration of horizontal direction, if only reduce vertical vibration still can not reach stable effect, the projecting apparatus still receives the vibration can cause the formation of image not clear and fuzzy.
Disclosure of Invention
Aiming at the defects of the background technology, the invention provides the projector base based on the holographic projection technology, which has the advantages of portability and good imaging effect and solves the problems provided by the background technology.
The invention provides the following technical scheme: a projector base based on holographic projection technology comprises a base, wherein the base is annular, four top contacts are uniformly and fixedly installed on the inner wall of the base, a vibration damping device is movably sleeved on an inner ring of the base through the top contacts, a sleeve is movably sleeved on the top of the vibration damping device, a rotating shaft is movably installed on the top of the sleeve, holographic projectors are fixedly connected to two ends of the rotating shaft, a cylindrical groove is formed in the top contact sleeved with the vibration damping device, a safety spring is fixedly connected to one end, sleeved on the cylindrical groove, of the top contact, a piston is fixedly connected to one end, far away from the top contact, of the safety spring, a vibration damping block is movably sleeved in the middle of the interior of the vibration damping device, the bottom of the vibration damping block is located in the cylindrical groove, a magnet is fixedly installed on the top of the interior of the vibration damping device, and a vibration damping spring is fixedly connected, the lateral wall of the sleeve is fixedly connected with two symmetrical fixed rods.
Preferably, the middle of the bottom of the holographic projector is provided with a circular table groove, the side wall of the circular table groove is provided with two symmetrical clamping grooves, and the end part of the fixed rod is clamped inside the clamping grooves.
Preferably, a U-shaped cavity is formed in the vibration reduction block, a liquid inlet is formed in the bottom of the vibration reduction block, a liquid outlet is formed in the side wall of the vibration reduction block, a small magnetic block is fixedly mounted at the top of the vibration reduction block, a liquid inlet check valve is fixedly mounted at the bottom of the U-shaped cavity, and a liquid discharge check valve is fixedly mounted in the liquid outlet.
Preferably, the bottom of the base is annularly provided with a fixing screw hole, and the fixing screw hole is matched with a bolt on the available support.
Preferably, the inside of the fixing rod is communicated with the inside of the sleeve, the opening of the communication hole at one end close to the fixing rod is large, and an air bag is fixedly mounted at the end part of the fixing rod.
Preferably, a certain amount of inert liquid is contained in the U-shaped cavity, the same inert liquid is filled in the positions, located between the pistons, in the cylindrical groove, the bottom opening of the liquid inlet is larger than the top, and the inner opening of the liquid outlet is larger than the outside.
Preferably, the bottom of the vibration reduction block is attached to the bottom of the cylindrical groove under the condition that the vibration reduction block is not vibrated, and the magnetic poles of the end parts of the small magnetic blocks corresponding to the magnets are the same and a certain air gap is formed between the small magnetic blocks and the magnets.
The invention has the following beneficial effects:
1. can cup joint together through the damping device and the sleeve that set up, compare in prior art, utilize the convenient dismantlement of the mode that cup joints, do benefit to and carry, telescopic top is provided with the axis of rotation simultaneously and can rotates with the projecting apparatus, can be very convenient adjust holographic projecting apparatus after the equipment and adapt to different service environment, damping device and base link together, can also the fixed bolster through the base, further increase the application range of projecting apparatus.
2. Through the damping device who sets up, its cooperation base and sleeve carry out the damping to the projecting apparatus, compare in prior art, can advance liquid extrusion into the U die cavity when the vibrational force passes through the base and transmits piston department in, force the damping piece to go up simultaneously, can descend again under the effect of magnetic repulsion, utilize the liquid of pressure differential in with the U die cavity to get rid of again this moment, the transfer of vibrational force has been realized, thereby reduce horizontal vibrational force, can weaken by damping spring greatly when going when the vibrational force transmission of vertical direction, thereby the gasbag on dead lever top can be caused in the ascending vibration of vertical direction simultaneously and expand and make it more stable with projecting apparatus body joint.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is an overall elevational view of the structure of the present invention;
FIG. 3 is an overall bottom view of the structure of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 6 is an enlarged view taken at A in FIG. 4;
fig. 7 is an enlarged view of fig. 6 at B.
In the figure: 1. a holographic projector; 101. a circular platform groove; 102. a card slot; 2. a base; 201. fixing screw holes; 202. a top contact; 3. a vibration damping device; 301. a cylindrical groove; 4. a sleeve; 5. a rotating shaft; 6. a safety spring; 7. a piston; 8. a vibration damping block; 801. a U-shaped cavity; 802. a liquid inlet; 803. a liquid discharge port; 804. a small magnetic block; 805. a liquid inlet check valve; 806. a liquid discharge check valve; 9. a magnet; 10. a damping spring; 11. and (5) fixing the rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-7, a projector base based on holographic projection technology comprises a base 2, the base 2 is ring-shaped and has four top contacts 202 uniformly and fixedly mounted on the inner wall thereof, the inner ring of the base 2 is movably sleeved with a vibration damping device 3 through the top contacts 202, the top of the vibration damping device 3 is movably sleeved with a sleeve 4, the top of the sleeve 4 is movably mounted with a rotating shaft 5, two ends of the rotating shaft 5 are fixedly connected with a holographic projector 1, the vibration damping device 3 is sleeved with the top contacts 202 and has a cylindrical groove 301 therein, one end of the top contacts 202 sleeved in the cylindrical groove 301 is fixedly connected with a safety spring 6, the safety spring 6 can play a role of force relief protection when the base 2 receives a large vibration force, so as to prevent the projector from being damaged, one end of the safety spring 6 far away from the top contacts 202 is fixedly connected with a piston 7, the middle part of the vibration damping device 3 is movably sleeved with a vibration damping block 8 and the bottom of, inside top fixed mounting of damping device 3 has magnet 9, fixedly connected with damping spring 10 between the inside top of sleeve 4 and damping device 3's the top, the dead lever 11 of two symmetries of sleeve 4's lateral wall fixedly connected with, circular table groove 101 has been seted up at the middle part of holographic projector 1 bottom, the draw-in groove 102 of two symmetries has been seted up to the lateral wall of circular table groove 101, the tip joint of dead lever 11 is in the inside of draw-in groove 102, U die cavity 801 has been seted up to damping piece 8's inside, inlet 802 has been seted up to damping piece 8's bottom, leakage fluid dram 803 has been seted up to damping piece 8's lateral wall, damping piece 8's top fixed mounting has little magnetic path 804, the bottom fixed mounting of U die cavity 801 has feed liquor check valve 805, the inside fixed.
Wherein, the bottom of base 2 is cyclic annular and has seted up fixed screw 201, and fixed screw 201 and the bolt looks adaptation on the available support, this base 2 can be installed with support looks adaptation, the scope of more facilitating the use.
Wherein, the inside of dead lever 11 and the inside intercommunication of sleeve 4 and the opening that the intercommunicating pore is close to dead lever 11 one end are big, and the tip fixed mounting of dead lever 11 has the gasbag, can compress the air in the sleeve 4 when vibration power impels damping device 3 to push up to move to make it enter into the gasbag in, increase dead lever 11 and holographic projector 1's joint intensity, prevent more that it from producing and rocking.
The U-shaped cavity 801 is filled with a certain amount of inert liquid, the positions, located between the pistons 7, in the cylindrical groove 301 are filled with the same inert liquid, the bottom opening of the liquid inlet 802 is larger than the top, the inner opening of the liquid outlet 803 is larger than the outside, the elimination of vibration force is realized by utilizing the circular flow of the liquid between the U-shaped cavity 801 and the cylindrical groove 301, the opening size of the liquid is in the same relation with the flow direction of the inlet liquid and the outlet liquid, and the liquid can flow through the liquid more easily.
The bottom of the vibration reduction block 8 is attached to the bottom of the cylindrical groove 301 under the condition that the vibration reduction block is not vibrated, the magnetic poles of the end parts of the small magnetic blocks 804 corresponding to the magnets 9 are the same, and a certain air gap exists between the small magnetic blocks and the magnets, when the vibration force extrudes liquid to the middle part, the vibration reduction block 8 is jacked up, so that the liquid enters the U-shaped cavity 801 under different pressure difference conditions, when the vibration is finished once, the vibration reduction block 8 is jacked down under the repulsive force action of the magnets 9, at the moment, the liquid in the U-shaped cavity 801 is discharged again, and a circulation process is achieved.
The working principle is that when the holographic projector 1 is used, the vibration damping device 3 and the sleeve 4 are connected and sleeved together, when vibration force is received, the base 2 firstly transmits the vibration force to the top contact 202, the top contact 202 pushes towards the inside of the cylindrical groove 301, inert liquid is extruded towards the middle through the safety spring 6 and the piston 7, the pressure of the inert liquid pushes the vibration damping block 8 upwards, meanwhile, the liquid passes through the liquid inlet 802 and pushes the liquid inlet one-way valve 805 to enter the U-shaped cavity 801, then when the vibration force is eliminated, the vibration damping block 8 is pushed back to the original position under the action of repulsive force between the magnet 9 and the small magnet 804, at the moment, the pressure in the U-shaped cavity 801 is larger than the outside, the liquid can pass through the liquid outlet 803 and pushes the liquid discharge one-way valve 806 to be discharged back, and the elimination of the horizontal vibration force is realized; when vertical vibration force is received, the vibration force acts on the damping spring 10 to reduce vibration, and air in the sleeve 4 is pressed into an air bag at the end part of the fixing rod 11 while the spring is compressed, so that the connection between the holographic projector 1 and the supporting part is firmer.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A projector base based on holographic projection technology, includes base (2), its characterized in that: the base (2) is annular, four top contacts (202) are uniformly and fixedly mounted on the inner wall of the base (2), a vibration damping device (3) is movably sleeved on the inner ring of the base (2) through the top contacts (202), a sleeve (4) is movably sleeved on the top of the vibration damping device (3), a rotating shaft (5) is movably mounted on the top of the sleeve (4), holographic projectors (1) are fixedly connected to two ends of the rotating shaft (5), a cylindrical groove (301) is formed in the top contact (202) sleeved with the vibration damping device (3), a safety spring (6) is fixedly connected to one end, far away from the top contacts (202), of the safety spring (6) is fixedly connected with a piston (7), a vibration damping block (8) is movably sleeved on the middle portion of the interior of the vibration damping device (3), and the bottom of the vibration damping block (8) is located in the cylindrical groove (301), the damping device is characterized in that a magnet (9) is fixedly mounted at the top inside the damping device (3), a damping spring (10) is fixedly connected between the top inside the sleeve (4) and the top of the damping device (3), and two symmetrical fixing rods (11) are fixedly connected to the side wall of the sleeve (4).
2. The projector mount according to claim 1, wherein: the holographic projector is characterized in that a circular table groove (101) is formed in the middle of the bottom of the holographic projector (1), two symmetrical clamping grooves (102) are formed in the side wall of the circular table groove (101), and the end portion of the fixing rod (11) is clamped inside the clamping grooves (102).
3. The projector mount according to claim 1, wherein: u die cavity (801) have been seted up to the inside of damping piece (8), inlet (802) have been seted up to the bottom of damping piece (8), leakage fluid dram (803) have been seted up to the lateral wall of damping piece (8), the top fixed mounting of damping piece (8) has little magnetic path (804), the bottom fixed mounting of U die cavity (801) has feed liquor check valve (805), leakage fluid dram (803) inside fixed mounting has flowing back check valve (806).
4. The projector mount according to claim 1, wherein: the bottom of the base (2) is annularly provided with a fixing screw hole (201), and the fixing screw hole (201) is matched with a bolt on the available support.
5. The projector mount according to claim 2, wherein: the inner part of the fixing rod (11) is communicated with the inner part of the sleeve (4), the opening of one end, close to the fixing rod (11), of the communication hole is large, and an air bag is fixedly mounted at the end part of the fixing rod (11).
6. A projector mount for holographic projection technology according to claim 3, wherein: a certain amount of inert liquid is contained in the U-shaped cavity (801), the same inert liquid is filled in the positions, located between the pistons (7), in the cylindrical groove (301), the bottom opening of the liquid inlet (802) is larger than the top, and the inner opening of the liquid outlet (803) is larger than the outside.
7. A projector mount for holographic projection technology according to claim 3, wherein: the bottom of the vibration reduction block (8) is attached to the bottom of the cylindrical groove (301) under the condition of not being vibrated, the magnetic poles of the end parts, corresponding to the small magnetic blocks (804) and the magnets (9), of the small magnetic blocks are the same, and a certain air gap exists between the small magnetic blocks and the magnets.
CN202010906806.2A 2020-09-01 2020-09-01 Projector base for holographic projection technology Active CN112066199B (en)

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Cited By (2)

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CN112944121A (en) * 2021-01-23 2021-06-11 孙会会 Rotation type slope camera device for control that can prevent crooked extrusion
CN114371591A (en) * 2022-01-20 2022-04-19 峰米(重庆)创新科技有限公司 Projection device and fixing assembly and fixing method thereof

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