CN110863642A

CN110863642A - Efficient lifting mechanism and control method thereof

Info

Publication number: CN110863642A
Application number: CN201911077470.7A
Authority: CN
Inventors: 李善宝
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-03-06

Abstract

The embodiment of the invention discloses a high-efficiency lifting mechanism which is characterized by comprising a U-shaped guide rail, an upper pawl mechanism, a lower pawl mechanism and an oil cylinder, wherein the upper pawl mechanism and the lower pawl mechanism are arranged in the guide rail; the pawl mechanism comprises a first pawl, a first spring, a second pawl and a second spring, a connecting column is fixedly arranged on the side wall of the first pawl, one end of the first spring is hinged with the pin shaft, the other end of the first spring is hinged with the connecting column, and the middle part of the first pawl is hinged on the pin shaft; the second pawl and the first pawl are arranged along the center of the pawl mechanism in a mirror image mode; a plurality of square holes which are vertically distributed are formed in the side wall of the guide rail and are located on one side of the first pawl and one side of the second pawl. The automatic feeding device has the effects of simple structure, convenience in operation and high automation degree.

Description

Efficient lifting mechanism and control method thereof

Technical Field

The embodiment of the invention relates to the technical field of aerospace launching tower lifting working platforms, in particular to an efficient lifting mechanism and a control method thereof.

Background

The space launching tower is provided with a plurality of working platforms at different elevations, and the working platforms need to be lifted and lowered due to different tasks. The lifting of the current working platform mainly comprises 1 oil cylinder, 2 pin shafts (1 pin shaft respectively at the upper part and the lower part of each oil cylinder) and 1U-shaped guide rail. The piston rod of the oil cylinder is vertically installed upwards, the oil cylinder and the guide rail are fixed by the lower pin shaft to play a main bearing role at ordinary times, and the piston rod and the guide rail are fixed by the upper pin shaft.

When rising:

first, the upper pin shaft is taken out. The position of the piston rod is properly adjusted, and the upper pin shaft is taken out.

And secondly, opening the piston rod to extend out of the valve. The piston rod of the oil cylinder extends out, the valve is closed after the piston rod reaches a certain position, and the piston rod and the guide rail are fixed by an upper pin shaft;

and thirdly, taking out the lower pin shaft. The position of the piston rod is properly adjusted, and the lower pin shaft is taken out.

And fourthly, opening the piston rod to retract the valve. The oil cylinder drives the working platform to rise (the piston rod is relatively retracted), the valve is closed after the working platform reaches a certain position, and the oil cylinder and the guide rail are fixed by the lower pin shaft. One of the lifting actions is completed.

When descending:

firstly, taking out a lower pin shaft;

and secondly, opening the piston rod to withdraw the valve. The working platform drives the oil cylinder to descend (the oil cylinder extends out), the valve is closed after the oil cylinder reaches a certain position, and the oil cylinder and the guide rail are fixed by a lower pin shaft;

thirdly, taking out the upper pin shaft;

and fourthly, opening the piston rod to extend out of the valve. The rodless cavity of the oil cylinder is filled with oil, the rod cavity is filled with oil, the piston rod is retracted, the valve is closed after the piston rod reaches a certain position, and the piston rod and the guide rail are fixed by the upper pin shaft. One of the lifting actions is completed.

In the process of ascending or descending, the upper pin shaft and the lower pin shaft are respectively taken and placed once by manual operation. The one-layer working platform is provided with two oil cylinders, and three persons are needed to cooperate, wherein the person who takes and places the pin shaft operates on two different heights. If two-layer or four-layer work platform goes up and down simultaneously, then need more people to cooperate, the inefficiency, the unsafe factor is many, and the problem that degree of automation is low is outstanding.

Disclosure of Invention

Therefore, the embodiment of the invention provides an efficient lifting mechanism and a control method thereof, and aims to solve the problem of low automation degree caused by the fact that more people are needed to work cooperatively in the prior art.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

a high-efficiency lifting mechanism comprises a U-shaped guide rail, at least one pair of pawl mechanisms arranged in the guide rail, panels arranged on two sides of each pawl mechanism and an oil cylinder arranged between the adjacent pair of pawl mechanisms, wherein the pair of panels at the bottom are connected with a working platform, the two panels adjacent to the pawl mechanisms are arranged at the same height, the side walls of the panels are attached to the side walls of the guide rail, and a plurality of pin shafts are connected between the two adjacent panels;

the pawl mechanism comprises a first pawl, a first spring, a limiting piece and a retaining pin, a connecting column is fixedly arranged on the side wall of the first pawl, one end of the first spring is hinged with a pin shaft, the other end of the first spring is hinged with the connecting column, the middle part of the first pawl is hinged on the pin shaft, a retaining hole for the retaining pin to insert is formed in the panel, the retaining pin can prevent the first pawl from popping out under the action of the first spring when the pawl mechanism descends, the retaining pin is positioned on one side, away from the side wall of the adjacent guide rail, of the first pawl, and the limiting piece is arranged on the panel and positioned on one side, away from the side wall of the adjacent guide rail, of the;

a plurality of square holes which are vertically distributed are formed in the side wall of the guide rail, the square holes are located on one side of the first pawl, and when the first pawl is attached to the side wall of the guide rail, the first spring is in a stretching state;

when the first pawl slides to the position of the square hole, the first spring contracts under the action of the elastic force of the first pawl and pulls the first pawl to rotate around the pin shaft connected with the first pawl, one side of the first pawl rotates and is clamped into the square hole, and the other side of the first pawl rotates to the position abutting against the limiting piece and is clamped on the limiting piece; when the first pawl ascends, the first pawl slides out of the square hole, and the first pawl is separated from the limiting piece;

when the first pawl is in a retracted state when the first pawl needs to be lowered, when the retaining pin is inserted into the retaining hole, the first spring is in a stretched state, one side of the first pawl abuts against the side wall of the guide rail, and the other side of the first pawl abuts against the retaining pin;

the oil cylinder is vertically arranged, a cylinder body ear ring of the oil cylinder is hinged on a pin shaft between panels of the upper pawl mechanism, and a piston rod ear ring of the oil cylinder is hinged on a pin shaft between panels of the lower pawl mechanism;

and a cylinder body lug of the oil cylinder, a piston rod lug of the oil cylinder, a pawl and a spring are respectively connected to different pin shafts.

Furthermore, the limiting piece comprises a second spring and a second pawl, the second spring and the second pawl are arranged in a mirror image mode with the first spring and the first pawl through the middle position of the panel, square holes are formed in two sides of the guide rail, and the square holes in the two sides are arranged along the middle of the panel in a mirror image mode; when the first pawl and the second pawl both extend into the square hole, a first limiting plane is arranged on the side wall of the first pawl, a second limiting plane is arranged on the side wall of the second pawl, and the first limiting plane and the second limiting plane are attached to each other and clamped with each other.

Further, the locating part includes the stopper, the stopper sets firmly on the lateral wall of arbitrary adjacent panel, the stopper is rectangle and vertical setting, the spacing plane of one-way mechanism has been seted up on the lateral wall of first pawl, and when first pawl rotated the square hole, the spacing plane of one-way mechanism pasted and blocked on the stopper with the upper surface of stopper mutually.

Further, a plurality of square holes are evenly distributed along the vertical direction of the guide rail, and the square holes are arranged at intervals of 200 cm.

Further, the thickness of the pawl is smaller than that of the oil cylinder lug.

Further, the width of the square hole is larger than the thickness of the first pawl.

Furthermore, a force bearing surface, a descending guide inclined surface and an ascending guide inclined surface are sequentially arranged on the side wall of the first pawl, when the first pawl extends into the square hole, the force bearing surface is in a horizontal state and is attached to the inner surface of the bottom of the square hole, one part of the force bearing surface is positioned in the square hole, and the other part of the force bearing surface is positioned outside the square hole; the descending guide inclined plane is positioned above the draft surface and is completely positioned in the square hole; the ascending guide inclined plane is positioned above the descending guide inclined plane, one part of the ascending guide inclined plane is positioned in the square hole, the other part of the ascending guide inclined plane is positioned outside the square hole, and when the first pawl slides out of the square hole, the top of the square hole is contacted along the ascending guide inclined plane.

Further, a control method of the efficient lifting mechanism comprises the following steps:

step one, opening a piston rod to extend out of a valve, and driving an upper pawl mechanism to ascend by extending the piston rod; when the square hole part is met, the upper pawl extends out under the action of the spring, and when no square hole exists, the upper pawl retracts again until the required square hole position is reached, the valve is closed, and the upper pawl keeps the extending state and is relatively fixed with the guide rail;

secondly, opening a piston rod retraction valve, driving a lower pawl and a working platform to ascend by an oil cylinder, retracting the lower pawl at a non-square hole part, extending a square hole part under the action of a spring until reaching a required position, closing the valve, and finishing one ascending action;

when descending:

step one, opening a piston rod retraction valve, driving a lower pawl and a working platform to ascend by an oil cylinder, retracting the lower pawl at a non-square hole part, closing the valve, and inserting a retaining pin;

secondly, opening a piston rod to extend out of the valve, lowering the working platform to a required square hole position, taking out the retaining pin, and extending out the lower pawl under the action of a spring;

thirdly, opening a piston rod to extend out of the valve, lifting the piston rod to a non-square hole part, retracting an upper pawl, closing the valve and inserting a retaining pin;

and fourthly, opening the piston rod to retract the valve, lowering the piston rod to the position of the required square hole, taking out the retaining pin, and extending the upper pawl under the action of the spring to realize the lowering action.

The embodiment of the invention has the following advantages:

when carrying out the operation that rises to work platform, the first pawl that is located the upper portion panel removes in another square hole of top from a square hole, operating personnel stretches out with button control piston rod, drive first pawl rebound and from the top roll-off of square hole, overturn downwards at the in-process first pawl of roll-off, first spring is progressively tensile, when first pawl complete roll-off in the square hole, first pawl supports the inner wall of guide rail under the pulling force effect of first spring, the inner wall that the panel pasted the guide rail simultaneously upwards slides, prevent the skew. After the first pawl moves into the square hole required by the upper side, the first pawl overturns upwards under the action of the tensile force of the first spring and extends into the square hole to be clamped, the first limiting plane and the second limiting plane on the other side of the first pawl are clamped mutually, and then the pawl mechanism at the position is fixed at the height. After the upper pawl mechanism reaches the designated height, an operator controls the piston rod to contract by using the button and drives the working platform and the lower panel to ascend, so that the integral ascending action is realized.

When the working platform is descended, the first pawl at the lower part moves from one square hole to the other square hole at the lower part, the pawl mechanism at the lower part of the oil cylinder and the working platform ascend to a non-square hole part firstly, then the retaining pin is inserted, the oil cylinder is operated to drive the pawl mechanism and the working platform to descend, even if the pawl mechanism and the working platform descend to the position of the non-required square hole, the retaining pin stops the first pawl from extending into the square hole, when the pawl mechanism reaches the position of the required square hole, the retaining pin is pulled out, and the first pawl extends into the square hole under the action of the tensile force of the first spring and is fixed at the required height; and then the pawl mechanism on the upper part is operated to ascend to a non-square hole part under the driving of the oil cylinder, the retaining pin is inserted, finally the oil cylinder is operated to drive the panel on the upper part to descend to the required square hole part, and the retaining pin is pulled out to finish the fixation, so that the integral descending action is realized.

When the lifting operation is carried out, the lifting operation can be realized only by pressing the buttons corresponding to the piston rod extending valve and the piston rod retracting valve in sequence; when descending, the retaining pin which needs to be plugged and unplugged only realizes the function of locking the pawl, compared with the pin shaft before improvement, the retaining pin does not directly support the gravity of the working platform any more, the volume and the mass of the retaining pin are greatly reduced, compared with the original condition that a plurality of people need to operate simultaneously, the lifting of the working platform can be realized only by one person, the automation degree is greatly improved, the lifting is realized without the cooperation of a plurality of people, and the unsafe factors are obviously reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.

Fig. 1 is a schematic structural diagram of a high-efficiency lifting mechanism provided in embodiment 1 of the present invention, in which a first pawl and a second pawl are located at non-square hole positions and the pawls are in a retracted state;

fig. 2 is a schematic structural diagram of a high-efficiency lifting mechanism provided in embodiment 1 of the present invention, in which a first pawl and a second pawl are located at square holes and the pawls are in an extended state;

fig. 3 is a schematic structural diagram of a guide rail of an efficient lifting mechanism provided in embodiment 1 of the present invention;

fig. 4 is a schematic side sectional view of an efficient lifting mechanism provided in embodiment 1 of the present invention;

fig. 5 is a schematic view illustrating an ascending process of an upper pawl mechanism of an efficient lifting mechanism according to embodiment 1 of the present invention;

fig. 6 is a schematic view illustrating an ascending process of a lower pawl mechanism of an efficient lifting mechanism according to embodiment 1 of the present invention;

fig. 7 is a schematic view illustrating a descending process of a lower pawl mechanism of an efficient lifting mechanism provided in embodiment 1 of the present invention;

fig. 8 is a schematic view illustrating a descending process of an upper pawl mechanism of an efficient lifting mechanism provided in embodiment 1 of the present invention;

fig. 9 is a schematic view of the overall structure of another single-sided guide rail efficient lifting mechanism provided in embodiment 2 of the present invention.

In the figure: 1. a guide rail; 11. a square hole; 2. a panel; 21. a retaining hole; 3. a pawl mechanism; 31. a first pawl; 311. connecting columns; 312. eating noodles; 313. a descending guide slope; 314. a rising guide slope; 315. an arc-shaped surface; 316. a first limit plane; 317. a first inclined plane; 318. a second inclined plane; 319. a one-way mechanism limiting plane; 32. a first spring; 33. a second pawl; 331. a second limit plane; 34. a second spring; 35. a retaining pin; 36. a limiting block; 4. an oil cylinder; 5. a pin shaft; 6. a working platform.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.

First embodiment, a high-efficiency lifting mechanism and a control method thereof are shown in fig. 1 and 2, and comprise a guide rail 1, at least two pairs of panels 2, a pawl mechanism 3 and an oil cylinder 4. The cross section of guide rail 1 is the U-shaped and vertical setting, and the inside of guide rail 1 is all located to panel 2, detent mechanism 3 and hydro-cylinder 4, and arbitrary two pairs of detent mechanisms 3 are upper and lower distribution in guide rail 1, and two panels 2 with the height setting adjacent with a detent mechanism 3, panel 2 are rectangle and vertical setting, and panel 2 is on a parallel with the interlude of guide rail 1 and the both sides of panel 2 paste with the inner wall of guide rail 1 both sides respectively mutually.

Six round pin axles 5 are inserted between the front and back board of two adjacent panels 2, and six round pin axles 5 set up along panel 2's middle part symmetry, and six round pin axles 5 are fixed two panels 2 and have certain interval between the adjacent panel 2.

The click mechanism 3 is located between adjacent panels 2, the click mechanism 3 including a first click 31, a first spring 32, a second click 33, a second spring 34, and a holding pin 35. The holding pin 35 is inserted only when it is lowered, the first pawl 31 and the first spring 32 are arranged by the middle position of the panel 2 in mirror image with the second spring 34 and the second pawl 33, the middle part of the first pawl 31 is hinged with the pin 5, the pin 5 is located at the side of the middle part of the panel 2. The first spring 32 is obliquely arranged above the panel 2, the upper end pin shaft 5 of the first spring 32 is hinged, the pin shaft 5 is positioned on one side of the upper part of the panel 2, the side wall of the first pawl 31 is fixedly provided with a cylindrical connecting column 311, and the lower end of the first spring 32 is hinged on the connecting column 311.

The downward rotation defined herein is the lowering of the first pawl 31 or the second pawl 33 at its lowest position when rotating; the upward rotation is such that the first pawl 31 or the second pawl 33 rises at its lowest position when rotated.

As shown in fig. 1 and 3, the side walls of the two sides of the guide rail 1 are provided with vertically arranged square holes 11, the square holes 11 are arranged on the side of the pawl, the square holes 11 on each side are uniformly distributed along the vertical direction, the number of the square holes 11 on each side is 1/n of the total stroke of the oil cylinder 4, and n is a natural number. The width of the square hole 11 is larger than the thickness of the first and

second pawls

31 and 33 to facilitate the entry of the first and

second pawls

31 and 33.

The height of square hole 11 is greater than the height that first pawl 31 stretched into it, and when first pawl 31 stretched into square hole 11, first spring 32 was in the unstressed state, when first pawl 31 slided out from square hole 11 in, can rotate downwards and offset with the inner wall of guide rail 1, first spring 32 was in the extension state this moment to produce ascending pulling force to first pawl 31.

As shown in fig. 2 and 4, a thrust surface 312, a descending guide inclined surface 313, an ascending guide inclined surface 314, an arc-shaped surface 315, a first limit plane 316, a first inclined surface 317, and a second inclined surface 318 are sequentially formed on a side wall of the first pawl 31. When the first pawl 31 and the second pawl 33 respectively extend into the adjacent square holes 11, the force bearing surface 312 is in a horizontal state and is attached to the inner surface of the bottom of the square hole 11, one part of the force bearing surface 312 is positioned in the square hole 11, and the other part of the force bearing surface 312 is positioned outside the square hole 11; the descending guide slope 313 is positioned above the draft surface 312 and completely inside the square hole 11; the ascending guide inclined plane 314 is positioned above the descending guide inclined plane 313, one part of the ascending guide inclined plane 314 is positioned in the square hole 11, the other part of the ascending guide inclined plane 314 is positioned outside the square hole 11, and when the first pawl 31 slides out of the square hole 11, the top of the square hole 11 contacts along the ascending guide inclined plane 314, so that the first pawl 31 can slide out smoothly; the pin shaft 5 connected with the first pawl 31 is coaxially arranged with the arc-shaped surface 315, the first limit plane 316 is vertically arranged at the middle position of the panel 2, the first inclined surface 317 and the second inclined surface 318 are sequentially arranged below the first limit plane 316, and the second inclined surface 318 is adjacent to the force bearing surface 312; the second pawl 33 is provided with a second limit plane 331, the second limit plane 331 is attached to and clamped with the first limit plane 316, and the rest positions of the second pawl 33 are symmetrical and identical to the first pawl 31, which is not described herein again. The side of the first pawl 31 that is clipped into the square hole 11 prevents the first pawl 31 from rotating downwards, and the first limit plane 316 and the second limit plane 331 are clipped to each other to prevent the first pawl 31 from rotating downwards, thereby fixing the panel 2 at this height. When the first and

second pawls

31 and 33 move to the non-square hole 11, the intersection of the ascending guide slope 314 and the descending guide slope 313 is located against the inner wall of the guide rail 1.

The middle position of the panel 2 is provided with a holding hole 21, a holding pin 35 is horizontally inserted in the holding hole 21, when the first pawl 31 and the second pawl 33 move to the non-square hole 11, the holding pin 35 is attached to the side walls of the first limit plane 316 and the second limit plane 331, and the first pawl 31 and the second pawl 33 are prevented from rotating downwards.

The oil cylinder 4 is positioned between two adjacent pairs of pawl mechanisms 3, a piston rod of the oil cylinder 4 is positioned above a cylinder body of the oil cylinder 4, an earring of the piston rod of the oil cylinder 4 is hinged with a pin shaft 5 between a pair of panels 2 of the adjacent pawl mechanism 3 above, and the pin shaft 5 is positioned at the lower part of the middle position of the panel 2; the cylinder body earrings of the oil cylinders 4 are hinged with a pin shaft 5 between a pair of panels 2 of the adjacent pawl mechanism 3 below, the pin shaft 5 is positioned at the upper part of the middle position of the panel 2, and the thickness of the pawls is smaller than that of the piston rods of the oil cylinders 4 and the cylinder body of the oil cylinder 4, so that the return under the tension of the springs is convenient. The pin 5 of the lowest panel 2 is hinged with one side of the working platform 6.

The working platform 6 is lifted in different modes, namely, the upper pawl mechanism 3 is lifted firstly, and then the lower pawl mechanism 3 and the working platform 6 are lifted again; when the working platform 6 is descended, the lower pawl mechanism 3 and the working platform 6 are descended firstly, and the upper pawl mechanism 3 is descended later. The extension and retraction of the piston rod of the oil cylinder 4 are controlled by pressing a corresponding button by a worker.

The control method of the efficient lifting mechanism comprises the following steps of:

firstly, as shown in fig. 5, the piston rod is opened to extend out of the valve, and the piston rod extends out to drive the upper pawl mechanism 3 to ascend; when the square hole 11 is met, the upper pawl extends out under the action of the spring, and when the square hole 11 is not available, the upper pawl retracts again until the required position of the square hole 11 is reached, the valve is closed, and the upper pawl keeps the extending state and is relatively fixed with the guide rail 1;

secondly, as shown in fig. 6, the piston rod is opened to withdraw the valve, the oil cylinder 4 drives the working platform 6 to ascend, the lower pawl retracts at the position without the square hole 11, the position with the square hole 11 extends under the action of the spring until reaching the required position, the valve is closed, and one ascending action is finished;

when descending:

step one, as shown in fig. 7, a piston rod is opened to withdraw a valve, an oil cylinder 4 drives a lower pawl mechanism 3 and a working platform 6 to ascend, a lower pawl retracts at a position without a square hole 11, the valve is closed, and a retaining pin 35 is inserted;

secondly, opening a piston rod extending valve, descending the working platform 6 to the position of the required square hole 11, taking out the retaining pin 35, and extending the lower pawl under the action of a spring;

thirdly, as shown in fig. 8, the piston rod is opened to extend out of the valve, the piston rod rises to the position without the square hole 11, the upper pawl retracts, the valve is closed, and the retaining pin 35 is inserted;

and fourthly, opening the piston rod to retract the valve, lowering the piston rod to the position of the required square hole 11, taking out the retaining pin 35, and extending the upper pawl under the action of the spring to realize the lowering action.

As shown in fig. 5 to 8, when the working platform 6 is lifted, the first pawl 31 and the second pawl 33 located in the upper pawl mechanism 3 move from one square hole 11 to the other square hole 11, the operator controls the piston rod to extend by using the button, so as to drive the first pawl 31 and the second pawl 33 to move upwards and slide out from the square hole 11, the first pawl 31 and the second pawl 33 turn downwards during sliding, the first spring 32 and the second spring 34 are gradually stretched, when the first pawl 31 and the second pawl 33 completely slide out from the square hole 11, the first pawl 31 and the second pawl 33 respectively abut against the inner wall of the guide rail 1 under the pulling force of the first spring 32 and the second spring 34, and the panel 2 slides upwards against the inner wall of the guide rail 1, so as to prevent deviation. After the first pawl 31 and the second pawl 33 move into the square hole 11 required above, the first pawl 31 and the second pawl 33 are turned upwards under the pulling force of the first spring 32 and extend into the square hole 11 to be clamped, the first pawl 31 and the second pawl 33 are clamped with each other through the first limiting plane 316 and the second limiting plane 331, and the pawl mechanism 3 at the position is fixed at the height. After the upper pawl mechanism 3 reaches the designated height, an operator controls the piston rod to contract by using a button and drives the working platform 6 and the lower pawl mechanism 3 to ascend, so that the integral ascending action is realized.

When the working platform 6 is lowered, the first pawl 31 and the second pawl 33 on the lower part move from one square hole 11 to the other square hole 11 on the lower part, the oil cylinder 4 firstly lifts the lower panel 2 and the working platform 6 to the position of the non-square hole 11, then the holding pin 35 is inserted, the oil cylinder 4 drives the panel 2 and the pawl mechanism 3 to descend, even if the lower panel 2 and the working platform 6 descend to the position of the non-required square hole 11, the holding pin 35 blocks the first pawl 31 and the second pawl 33 from extending into the square hole 11, when the required position of the square hole 11 is reached, the holding pin 35 is pulled out, and the first pawl 31 and the second pawl 33 extend into the square hole 11 under the tensile force of the first spring 32 and are fixed at the required height; then the upper panel 2 is driven by the oil cylinder 4 to rise to the non-square hole 11 part, the holding pin 35 is inserted, the oil cylinder 4 drives the upper panel 2 to fall to the required square hole 11 part, and the holding pin 35 is pulled out to complete the fixation, so that the integral descending action is realized.

Therefore, the lifting operation can be realized only by pressing the buttons corresponding to the piston rod extending valve and the piston rod retracting valve in sequence; when descending, the function of locking pawl is only realized to the round pin 35 that keeps of needs plug, compares with round pin axle 5 before improving, no longer directly supports work platform 6 gravity, keeps round pin 35 volume, quality to reduce greatly, compares in the condition that needs many people concurrent operation originally, only needs alone to operate just can realize work platform 6's lift. And has the following advantages:

(1) the structure is simple. The whole mechanism is box-shaped, the width of the whole mechanism is basically consistent with the inner width of the guide rail 1, the height of the whole mechanism meets the functional requirements, and the whole mechanism is small, exquisite and compact, has few parts and is convenient to manufacture. Can be used under the existing conditions without great modification.

(2) The operation is simple. The automation degree is improved, and the personnel operation and the unsafe factors of the personnel are reduced. When the lifting pin is lifted, only two steps of operation are needed, and when the lifting pin is lowered, the retaining pin 35 which needs to be plugged and pulled only achieves the function of locking the pawl, compared with the pin shaft 5 before improvement, the gravity of the working platform 6 is not directly supported any more, and the size and the mass of the retaining pin 35 are greatly reduced.

The second embodiment is basically the same in structure as the first embodiment, except that, as shown in fig. 1 and 9, the click mechanism 3 includes a stopper 36 and no longer includes the second click 33 and the second spring 34, and the click mechanism 3 includes the connection structure between the first click 31, the first spring 32, and the holding pin 35 and the panel 2 is the same as that of the first embodiment, but the connection position is shifted toward the side of the second click 33. The limiting block 36 is vertically and fixedly arranged on the side wall of any adjacent panel 2, the limiting block 36 is rectangular, the side wall of the first pawl 31 is provided with a one-way mechanism limiting plane 319, and when the first pawl 31 rotates into the square hole 11, the one-way mechanism limiting plane 319 is attached to the upper surface of the limiting block 36 and clamped on the limiting block 36. The stopper 36 prevents the first pawl 31 from rotating downward, thereby fixing the panel 2 at that height. Such a pawl, like a spring, enables the lifting of the work platform 6.

The third embodiment is basically the same as the first embodiment, and the difference is that: the guide rail 1 is a flat hole, and the force surface 3 of the pawl is changed to be vertical to the side wall surface of the panel, so that the force surface 3 is matched with the flat hole.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A high-efficiency lifting mechanism is characterized by comprising a U-shaped guide rail, at least one pair of pawl mechanisms arranged in the guide rail, panels arranged on two sides of each pawl mechanism and an oil cylinder arranged between the adjacent pair of pawl mechanisms, wherein the pair of panels at the lowest part are connected with a working platform, the two panels adjacent to the pawl mechanisms are arranged at the same height, the side walls of the panels are attached to the side walls of the guide rail, and a plurality of pin shafts are connected between the two adjacent panels;

2. The efficient lifting mechanism according to claim 1, wherein the limiting member comprises a second spring and a second pawl, the second spring and the second pawl are arranged in a mirror image manner with the first spring and the first pawl through the middle position of the panel, square holes are formed in two sides of the guide rail, and the square holes in the two sides are arranged in a mirror image manner along the middle part of the panel; when the first pawl and the second pawl both extend into the square hole, a first limiting plane is arranged on the side wall of the first pawl, a second limiting plane is arranged on the side wall of the second pawl, and the first limiting plane and the second limiting plane are attached to each other and clamped with each other.

3. The efficient lifting mechanism according to claim 1, wherein the limiting member comprises a limiting block, the limiting block is fixedly arranged on the side wall of any adjacent panel, the limiting block is rectangular and vertically arranged, a one-way mechanism limiting plane is arranged on the side wall of the first pawl, and when the first pawl rotates into the square hole, the one-way mechanism limiting plane is attached to the upper surface of the limiting block and clamped on the limiting block.

4. A high efficiency lift mechanism as set forth in claim 1, wherein said plurality of square holes are uniformly distributed along the vertical direction of the guide rail, said square holes being spaced at 200cm intervals.

5. A high efficiency lift mechanism as set forth in claim 1 wherein said pawl is of a thickness less than the thickness of the cylinder ears.

6. A high efficiency lift mechanism as set forth in claim 1 wherein said square hole has a width greater than the thickness of said first pawl.

7. The efficient lifting mechanism according to claim 1, wherein a force bearing surface, a descending guide inclined surface and an ascending guide inclined surface are sequentially arranged on the side wall of the first pawl, when the first pawl extends into the square hole, the force bearing surface is in a horizontal state and is attached to the inner surface of the bottom of the square hole, one part of the force bearing surface is positioned in the square hole, and the other part of the force bearing surface is positioned outside the square hole; the descending guide inclined plane is positioned above the draft surface and is completely positioned in the square hole; the ascending guide inclined plane is positioned above the descending guide inclined plane, one part of the ascending guide inclined plane is positioned in the square hole, the other part of the ascending guide inclined plane is positioned outside the square hole, and when the first pawl slides out of the square hole, the top of the square hole is contacted along the ascending guide inclined plane.

8. A control method of a high-efficiency lifting mechanism is characterized in that when the lifting mechanism ascends:

when descending: