CN113703249A

CN113703249A - Rope stretching mechanism and lens protection device

Info

Publication number: CN113703249A
Application number: CN202110949296.1A
Authority: CN
Inventors: 毛家玲; 史天宝
Original assignee: Huanghu Science And Technology Co ltd
Current assignee: Huanghu Science And Technology Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-11-26

Abstract

The invention discloses a rope pulling and stretching mechanism and a lens protection device adopting the same, and the rope pulling and stretching mechanism comprises a rope, a pulley arranged in the middle of the rope, a lens barrel and a lens cover capable of being covered on the lens barrel, wherein one end of the rope is a power input end, the other end of the rope is an output end, the outer diameter of the pulley is larger than the height of the power input end in a horizontal state, one end of the lens cover is hinged with one end of the lens barrel, the power input end is connected with a power mechanism, the output end is fixedly connected with the other end of the lens cover, the transmission precision requirement is low, the design is simple, a driving force arm is larger than a resistance arm, and no transmission dead point exists; the power mechanism drives the rope to act when contracting, so that the lens cover can be opened; when the power mechanism extends out, the lens cover realizes the closing action under the combined action of gravity and the coil spring; the lens barrel is provided with a pulley yoke, and a coil spring with one end fixedly connected with the pulley yoke is sleeved on a rotating shaft of the pulley, so that the self-locking of the lens barrel cover when closed is realized.

Description

Rope stretching mechanism and lens protection device

Technical Field

The invention relates to the technical field of photoelectric detection equipment, in particular to a rope stretching mechanism and a lens protection device.

Background

When the lens of the telescope or the optical device is not used, the lens protection device needs to be covered by manual operation, but if the device is large in size or the manual operation at the installation position is difficult, a lot of inconvenience is brought to the simple work.

In order to realize the automatic opening and closing of the lens protection device, chinese patent with publication number CN107608068A discloses an automatic opening and retracting lens cover device for a photoelectric telescope, which comprises a lens cover, a lens barrel and a cover opening mechanism; the lens cover is arranged at the front end of the lens barrel, the cover opening mechanism is fixed on the lens barrel and connected with the lens cover, the lens cover comprises a cover plate and a sliding groove, the inner surface of the cover plate is provided with the sliding groove along the radial direction, one end of the sliding groove extends to the outside of the lens cover, the lower end of the lens cover is fixed with a magnet A, and the tail end of the sliding groove extending to the outside of the lens cover is provided with a baffle plate; a hinge A is arranged near the tail end of the sliding chute; a guide rod is also arranged in the sliding groove. The lens cover is opened and closed by the cover opening mechanism, and the lens cover is locked under the closed state by the magnet.

Chinese patent publication No. CN111505788A discloses an automatic lens cover, which comprises a powered compression electromagnet, a pull rod, a turning bracket, and a lens cover; a shaft lever and a coil spring are arranged in the electrified compression electromagnet, electromagnets are arranged at two ends of the shaft lever, and the shaft lever moves back and forth along with the compression of the coil spring; the magnet at the front end of the shaft lever is connected with the pull rod, the front end of the pull rod is connected with the turning support, and the turning support is fixedly connected with the lens cover; the electrified compression electromagnet drives the pull rod to move backwards under the electrified condition, the pull rod pulls the connection point of the turning support, and the turning support rotates around the fulcrum and drives the lens cover to be opened. And the lens cover is opened and closed by energizing the compression magnet to drive the mechanism.

Chinese patent publication No. CN209297006U discloses an automatic protection device for an optical machine lens, which comprises a control driver, a driving motor and a transmission assembly, which are connected in sequence, wherein the transmission assembly comprises a worm gear mechanism and a main shaft, a worm of the worm gear mechanism is connected with the motor, a worm wheel shaft of the worm gear mechanism is coaxially provided with a first gear and a worm wheel, the main shaft is provided with a second gear and a connecting rod group, the first gear is meshed with the second gear, a connecting rod of the connecting rod is connected with a lens cover, and the lens cover can be automatically locked to ensure that the lens cover can reliably shield the lens by using the self-locking characteristic of the worm gear after power failure.

The above inventions all have some common disadvantages:

1. because the transmission mechanism basically adopts rigid hinges and link mechanisms, the requirement on transmission precision is high, and the design is complex.

2. The stress point of the lens cap is closer to the rotation center of the lens cap, the power arm is smaller than the gravity force arm of the lens cap, and the required driving moment is larger.

3. The link mechanism has a dead point, and if the transmission amplitude exceeds the dead point, the mechanism cannot act, which limits the opening amplitude range of the lens cover.

Therefore, those skilled in the art have been devoted to developing a cord stretching mechanism and a lens protection device having a simple structure.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a rope tensioning mechanism that can be simple in structure.

In order to achieve the purpose, the rope stretching mechanism provided by the invention comprises a rope and a pulley arranged in the middle of the rope, wherein one end of the rope is a power input end, the other end of the rope is an output end, the distance between the power input end and the pulley is greater than the distance between the output end and the pulley, and the outer diameter of the pulley is greater than the height of the power input end in a horizontal state.

Still include one and be close to the deflector of power input end, the deflector is provided with the guiding hole that runs through, under the horizontality, the height of guiding hole with power input end's high parallel and level.

The invention also provides a lens protection device, which comprises the rope stretching mechanism, a lens barrel and a lens cover capable of being covered on the lens barrel, wherein one end of the lens cover is hinged with one end of the lens barrel, the power input end is connected with a power mechanism, and the output end is fixedly connected with the other end of the lens cover.

The power mechanism is one of an air cylinder, a hydraulic cylinder, a linear motor, a screw rod nut or an electric push rod.

The power mechanism is an electric push rod, and one end of a push rod of the electric push rod is connected with the power input end.

The lens cone is provided with a pulley frame, a coil spring with one end fixedly connected with the pulley frame is sleeved on a rotating shaft of the pulley, and the other end of the coil spring is fixedly connected with the rotating shaft of the pulley.

The other end of the lens cap is fixedly connected with a rope fixer, and the output end is fixedly connected with the rope fixer.

The lens barrel is characterized in that a sealing groove is formed in the inner side of the opening of the lens barrel, an elastic sealing ring is filled in the sealing groove, and a convex ring which is attached and sealed to the top of the elastic sealing ring is arranged on the inner side of the lens cover.

The invention has the beneficial effects that: the invention relates to a rope stretching mechanism and a lens protection device adopting the same, which comprises a rope, a pulley arranged in the middle of the rope, a lens barrel and a lens cover capable of covering the lens barrel, wherein one end of the rope is a power input end, the other end of the rope is an output end, the outer diameter of the pulley is greater than the height of the power input end in a horizontal state, one end of the lens cover is hinged with one end of the lens barrel, the power input end is connected with a power mechanism, the output end is fixedly connected with the other end of the lens cover, the transmission precision requirement is low, the design is simple, a driving force arm is greater than a resistance arm, and no transmission dead point exists; the lens barrel is provided with a pulley frame, and a coil spring with one end fixedly connected with the pulley frame is sleeved on a rotating shaft of the pulley, so that the self-locking of the lens barrel cover when closed is realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the structure of the present invention;

fig. 3 is a sectional view of the structure at a-a in fig. 2.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 3, a rope stretching mechanism comprises a rope 1 and a pulley 2 arranged in the middle of the rope 1, wherein one end of the rope 1 is a power input end 11, the other end of the rope 1 is an output end 12, the distance between the power input end 11 and the pulley 2 is greater than the distance between the output end 12 and the pulley 2, the outer diameter of the pulley 2 is greater than the height of the power input end 11 in a horizontal state, the rope stretching mechanism is low in transmission precision requirement, simple in design, and free of transmission dead points, and a driving force arm is greater than a resistance arm.

Further, still include one and be close to power input 11's deflector 3, deflector 3 is provided with the guiding hole 31 that runs through, and under the horizontality, the height of guiding hole 31 with power input 11's height is the same level.

The embodiment further provides a lens protection device, which includes the above rope stretching mechanism, and further includes a lens barrel 4 and a lens cover 5 capable of being covered on the lens barrel 4, one end of the lens cover 5 is hinged to one end of the lens barrel 4, the power input end 11 is connected to a power mechanism, the output end 12 is fixedly connected to the other end of the lens cover 5, in this embodiment, a pulley frame 7 is arranged on the lens barrel 4, a coil spring 8 with one end fixedly connected to the pulley frame 7 is sleeved on a rotating shaft of the pulley 2, the other end of the coil spring 8 is fixedly connected to the rotating shaft of the pulley 2, and the power mechanism drives the rope 1 to move when contracting, so as to open the lens cover; when the power mechanism extends out, the lens cover realizes the closing action under the combined action of the gravity and the coil spring 8.

The inner side of the opening of the lens barrel 4 is provided with a sealing groove 13, the sealing groove 13 is filled with an elastic sealing ring, the inner side of the lens cover 5 is provided with a convex ring 14 which is attached and sealed at the top of the elastic sealing ring, the convex ring 14 and the elastic sealing ring form a sealing structure, and self-locking and sealing when the lens barrel cover is closed are realized through a coil spring 8 and a structural sealing design.

The power mechanism is one of an air cylinder, a hydraulic cylinder, a linear motor, a screw nut or an electric push rod, in this embodiment, the power mechanism is an electric push rod 6, and one end of a push rod 16 of the electric push rod 6 is connected with the power input end 11. Preferably, the electric push rod is provided with a stroke limiting mechanism, and when the lens cover is opened or closed in place, the electric push rod automatically stops to form a simple closed-loop control system.

The other end of the lens cap 5 is fixedly connected with a rope fixer 9, and the output end 12 is fixedly connected with the rope fixer 9, so that the structure is simple, and the adjustment is convenient.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a rope stretching mechanism, includes rope (1), its characterized in that: still including setting up pulley (2) at rope (1) middle part, the one end of rope (1) is power input end (11), and the other end is output (12), power input end (11) with distance between pulley (2) is greater than output (12) with distance between pulley (2), under the horizontality, the external diameter of pulley (2) is greater than the height of power input end (11).

2. A cord stretching mechanism as recited in claim 1, characterized in that: still include one and be close to deflector (3) of power input end (11), deflector (3) are provided with guiding hole (31) that run through, under the horizontality, the height of guiding hole (31) with the height parallel and level of power input end (11).

3. A lens protection device is characterized in that: the rope stretching mechanism comprises the rope stretching mechanism according to claim 2, and further comprises a lens barrel (4) and a lens cover (5) capable of being covered on the lens barrel (4), wherein one end of the lens cover (5) is hinged to one end of the lens barrel (4), the power input end (11) is connected with a power mechanism, and the output end (12) is fixedly connected with the other end of the lens cover (5).

4. A lens protection device as claimed in claim 3, wherein: the power mechanism is one of an air cylinder, a hydraulic cylinder, a linear motor, a screw rod nut or an electric push rod.

5. A lens protection device as claimed in claim 4, wherein: the power mechanism is an electric push rod (6), and one end of a push rod (16) of the electric push rod (6) is connected with the power input end (11).

6. A lens protection device as claimed in claim 3, wherein: the lens cone (4) is provided with a pulley yoke (7), a coil spring (8) with one end fixedly connected with the pulley yoke (7) is sleeved on a rotating shaft of the pulley (2), and the other end of the coil spring (8) is fixedly connected with the rotating shaft of the pulley (2).

7. A lens protection device as claimed in claim 3, wherein: the other end fixedly connected with rope fixer (9) of lens cap (5), output (12) with rope fixer (9) fixed connection.

8. A lens protection device as claimed in claim 3 or 6, wherein: the opening inboard of lens cone (4) is provided with seal groove (13), seal groove (13) intussuseption is filled with elastic sealing circle, the inboard of lens cap (5) is provided with the laminating and seals protruding circle (14) at elastic sealing circle top.