CN112499513B

CN112499513B - Electric scissor type lifting platform stable in starting

Info

Publication number: CN112499513B
Application number: CN202011585163.2A
Authority: CN
Inventors: 郑佃良
Original assignee: Ningbo Cholift Forklift Co ltd
Current assignee: NINGBO CHOLIFT FORKLIFT Co.,Ltd.
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-02-18
Anticipated expiration: 2040-12-28
Also published as: CN112499513A

Abstract

The invention relates to the technical field of lifting equipment, in particular to an electric scissor-fork type lifting platform which is stable in starting, and the electric scissor-fork type lifting platform comprises a base, a scissor-fork structure and a lifting platform, wherein the scissor-fork structure comprises a scissor-fork arm group, the scissor-fork arm group comprises a first scissor-fork arm and a second scissor-fork arm, the middle parts of the first scissor-fork arm and the second scissor-fork arm are connected with a hinged shaft, the base is horizontally and slidably connected with a translation shaft and a translation frame, a fixed shaft is fixedly connected in an inner groove, the first scissor-fork arm is rotatably connected with the fixed shaft, and the second scissor-fork arm is rotatably connected with the translation shaft; the translation frame is rotatably connected with a main shaft, the main shaft is fixedly connected with a turntable, a spiral track is fixed on the turntable, and sliding block assemblies capable of being in sliding connection with the spiral track are fixed on the fixed shaft and the translation shaft; the center of the rotary table is connected with a vertically arranged screw rod, and a connecting piece which can be connected with an articulated shaft is connected onto the screw rod. The scheme firstly increases the starting angle through the screw rod, so that the problem that the required horizontal thrust is too large during starting is solved.

Description

Electric scissor type lifting platform stable in starting

Technical Field

The invention relates to the technical field of lifting equipment, in particular to an electric scissor type lifting platform which is stable in starting.

Background

A scissor-type lifting platform is a single-degree-of-freedom lifting machine which does vertical motion, mainly comprises a lifting platform, a base, a scissor-type fork structure and a driving part, wherein the scissor-type fork structure is folded through the driving part, so that objects on the lifting platform are lifted to different heights, and the scissor-type lifting platform is widely applied to the fields of logistics, production lines, warehouses, automation and the like. The driving part generally adopts hydraulic pressure or electric, wherein the electric type conventionally adopts a motor to drive a screw rod, and horizontal thrust is formed by the rotation of the screw rod, so that the movement of a scissor arm in a scissor structure is realized. However, in the existing electric scissor-fork type lifting platform, because the angle between the scissor arms and the horizontal plane during lifting, namely the initial angle, is small, a large horizontal thrust is needed during starting, and through theoretical calculation, the current initial thrust is at least more than several times of the weight of a load. The required horizontal thrust is too large, so that a large load is formed on the motor, and the service life of the motor is influenced.

Disclosure of Invention

The invention aims to provide an electric scissor-type lifting platform which is stable in starting, and solves the problems that in the prior art, the starting angle of a scissor arm is small, and the required horizontal thrust is overlarge during starting.

The scheme is as follows: the electric scissor type lifting platform is stable in starting and comprises a base, a scissor structure and a lifting platform are connected above the base, the scissor structure comprises a plurality of scissor arm groups which are connected with each other, each scissor arm group comprises a first scissor arm and a second scissor arm, the middle parts of the first scissor arm and the second scissor arm are connected with a hinged shaft, an inner groove is formed in the base, a translation shaft and a translation frame are horizontally and slidably connected in the inner groove, a fixed shaft is fixedly connected in the inner groove, in the scissor arm group connected with the base, the first scissor arm is rotatably connected with the fixed shaft, and the second scissor arm is rotatably connected with the translation shaft; the translation frame is rotatably connected with a main shaft, the main shaft is fixedly connected with a turntable, a spiral track is fixed on the turntable, a motor for driving the turntable to rotate is further fixed on the translation frame, and sliding block assemblies capable of being in sliding connection with the spiral track are fixed on the fixed shaft and the translation shaft; the center of the rotary table is connected with a vertically arranged screw rod, and a connecting piece which can be connected with an articulated shaft is connected onto the screw rod.

Has the advantages that: in this scheme, in case the articulated shaft is connected with the connecting piece, can restrict the rotation of connecting piece, when the motor drives the carousel and rotates, because the connecting piece receives the articulated shaft restriction and can't be rotatory, rotation between connecting piece and the carousel, this rotation passes through the screw thread effect on the lead screw, has become the vertical elevating movement of connecting piece. When the lifting platform is required to be lifted, the thrust of the upward movement of the connecting piece acts on the hinged shaft, so that the middle parts of the first scissor arm and the second scissor arm move upwards, the purpose of increasing the initial angle is realized, and compared with the prior art, the required force during starting is greatly reduced. The subsequent turntable rotates, horizontal pulling force is applied to the translation shaft through the spiral track and the sliding block assembly, so that the translation shaft moves towards the center of the turntable, and the initial horizontal pulling force applied by the spiral track is greatly reduced compared with the prior art because the initial angle is increased; simultaneously, the rotational speed of carousel and lead screw is the same in this scheme, nevertheless is inequality around the vertical migration distance of articulated shaft, and the lead screw increases the initial angle in-process, and the translation rate of elevating platform is less than the translation rate after the spiral track effect to the influence that the initial speed of elevating platform is too fast among the prior art has been reduced.

Furthermore, a threaded hole is axially formed in the spindle, the screw rod is in threaded connection with the threaded hole, and the connecting piece is fixed to the upper end of the screw rod. When the scissors structure is folded up like this, the lead screw can move down relatively carousel and main shaft to obtain accomodating, compare under the alternative of this scheme, the lead screw is fixed with the carousel, connecting piece and lead screw threaded connection, the lead screw can not contradict the elevating platform.

Further, the connecting piece includes the connecting seat, is equipped with the recess that the articulated shaft can get into on the connecting seat. The articulated shaft enters the groove, so that the connection between the connecting seat and the articulated shaft is formed.

Further, the connecting piece includes the connecting seat, is equipped with vertical groove on the connecting seat, and vertical inslot sliding connection has the roll-off piece, and the lower extreme of roll-off piece and the bottom in vertical groove are fixed with the elastic component. Can form like this through the roll-off piece can with articulated shaft complex recess, in case the articulated shaft has aimed at the recess between two roll-off pieces and has got into the recess, slider piece accessible spring upwards pops out, plays the effect of connection, directly sets up the recess relatively, has improved the accuracy that articulated shaft and connecting seat are connected.

Further, the sliding block assembly comprises an installation beam, a matching block is fixed on the installation beam, and a matching groove into which the spiral track can enter is formed in the matching block. A plurality of matching blocks can be arranged on the mounting beam to share the force action; when the spiral track rotates, the end part of the spiral track enters the matching groove, so that the sliding block assembly is connected with the spiral track, and the sliding block assembly transmits tension to the translation shaft.

Furthermore, an arc-surface contact block is fixed on the side wall of the matching groove. The arrangement of the cambered surface contact block enables the two ends of the matching groove to be wide and the middle part to be narrow, the end part of the spiral track is favorably and smoothly enters the matching groove, the curvature change of different positions of the spiral track is adapted, and the friction between the matching groove and the spiral track is reduced.

Furthermore, a driving chain wheel is fixed on an output shaft of the motor, a driven chain wheel is fixed on the main shaft, and a chain is connected between the driving chain wheel and the driven chain wheel. The motor drives the turntable through a chain and a chain wheel, and compared with a belt and gear mode, the motor is low in cost and low in maintenance rate.

Furthermore, a limiting block is fixed on the base, and the lower surface of the lifting platform can be abutted against the limiting block. After the scissors structure was folded up, the lower surface and left stopper and the right stopper of elevating platform offset, avoid the elevating platform height to receive the thing influence and too reduce to form the protection to structure, improve equipment life and stability.

Drawings

Fig. 1 is a schematic overall structure diagram of a first embodiment of the present invention.

Fig. 2 is a top view of the scissors configuration and base of fig. 1.

Fig. 3 is a schematic sectional view taken along line a-a of fig. 2.

Fig. 4 is a schematic view of a connection structure between the scissors structure and the translation frame.

Fig. 5 is a schematic top view of the pan carriage.

Fig. 6 is a schematic top view of the turntable.

Fig. 7 is an enlarged structural view of the slider assembly.

Fig. 8 is a schematic view along the direction B-B of fig. 7.

Fig. 9 is a schematic view of the connection of the lead screw and the main shaft.

Fig. 10 is a schematic structural view of a connecting seat in the second embodiment of the invention.

In the figure: the device comprises a base 10, a left limiting block 11, a right limiting block 12, an inner groove 13, a main sliding groove 15, an auxiliary sliding groove 16, a sliding block assembly 17, a first scissor arm 21, a second scissor arm 22, a fixed shaft 23, a translation shaft 24, a translation block 25, a hinge shaft 27, a lifting platform 30, a driven sliding groove 31, a translation frame 40, a motor 41, a driven sprocket 42, a main shaft 43, a rotary table 44, a spiral track 45, a screw rod 50, a connecting seat 51, a mounting beam 70, a matching block 71, a matching groove 72, a cambered surface contact block 73 and a sliding-out block 55.

Detailed Description

The examples are as follows:

the embodiment provides a start steady electronic fork lift platform of cutting, as shown in fig. 1, including base 10, base 10 top has connected gradually and has cut fork structure and elevating platform 30, cuts the fork structure and includes a plurality of interconnect's cut fork arm group, and every cuts fork arm group and all includes that length is the same first cut fork arm 21 and second cut fork arm 22, and first cut fork arm 21 middle part is articulated through articulated shaft 27 with second cut fork arm 22 middle part. The lower surface of the lifting platform 30 is fixed with a driven sliding chute 31, in the shearing fork arm group connected with the lifting platform 30, the upper end of the first shearing fork arm 21 is horizontally connected with the driven sliding chute 31 in a sliding manner, and the upper end of the second shearing fork arm 22 is hinged with the lower surface of the lifting platform 30.

Referring to fig. 2, a top view of the base 10 is shown, wherein a recessed inner groove 13 is formed in the base 10, a fixing shaft 23 and a translation shaft 24 are disposed in the inner groove 13, and both ends of the fixing shaft 23 are fixedly connected to the side wall of the inner groove 13. As shown in fig. 3, a main sliding groove 15 is fixed on the side wall of the inner groove 13, a translation block 25 is slidably connected to the main sliding groove 15, two ends of a translation shaft 24 are fixedly connected to the translation block 25, and the translation shaft 24 and the fixed shaft 23 are always located on the same horizontal plane. In the scissors arm group connected with the base 10, the lower end of the first scissors arm 21 is rotatably connected with the fixed shaft 23, and the lower end of the second scissors arm 22 is rotatably connected with the translation shaft 24.

As shown in fig. 3, a sub-chute 16 is further fixedly connected to the side wall of the inner tank 13, and two sliders are slidably connected to the sub-chute 16. As shown in fig. 4 and 5, the sliding block is fixedly connected with a translation frame 40. The translation frame 40 is rotatably connected with a main shaft 43 through a bearing, a driven sprocket 42 and a turntable 44 are connected to the upper portion of the main shaft 43 in a key mode, and the driven sprocket 42 is located below the turntable 44. The translation frame 40 is fixedly connected with a motor 41 through bolts, an output shaft of the motor 41 is rotatably connected with the translation frame 40 through a bearing, the output shaft is fixedly connected with a driving chain wheel, and the driving chain wheel and the driven chain wheel 42 are in chain transmission.

As shown in fig. 4 and 6, the spiral tracks 45 are fixedly connected to the upper surface of the turntable 44, and the distances between the adjacent spiral tracks 45 are the same at different radii of the turntable 44. The fixed shaft 23 and the translation shaft 24 are both fixedly connected with a sliding block assembly 17, and the sliding block assembly 17 can be in sliding connection with the spiral track 45. As shown in fig. 4 and 7, the slider assembly 17 includes a mounting beam 70, the mounting beam 70 is welded to the fixed shaft 23 and the translation shaft 24, a plurality of fitting blocks 71 are fixedly connected to a lower surface of the mounting beam 70, fitting grooves 72 into which the spiral rails 45 can enter are formed in the fitting blocks 71, and arc contact blocks 73 are fixed to both side walls of the fitting grooves 72. As shown in fig. 8, the arrangement of the arc-shaped contact block 73 makes the two ends of the fitting groove 72 wide and the middle part narrow, which is beneficial for the end of the spiral track 45 to smoothly enter the fitting groove 72, and meanwhile, the arc-shaped contact block adapts to the curvature change of different positions of the spiral track 45, and reduces the friction between the fitting groove 72 and the spiral track 45.

As shown in fig. 4 and 6, a screw rod 50 is disposed at a central position of the rotary table 44, as shown in fig. 9, a threaded hole is disposed on the main shaft 43 along the axial direction, and the screw rod 50 vertically penetrates through the threaded hole and is in threaded connection with the threaded hole. A connecting seat 51 is fixed at the upper end of the screw rod 50, and a groove for the hinge shaft 27 to enter is formed on the upper surface of the connecting seat 51.

The specific implementation process is as follows:

when the scissors are not in use, the first scissors arm 21 and the second scissors arm 22 are approximately parallel to the horizontal plane, the scissors structure is in a folding state, and meanwhile, the hinge shaft 27 is positioned in the groove of the connecting seat 51.

When the rotary table is used, the motor 41 is started, the motor 41 drives the main shaft 43 to rotate through the chain and the driven chain wheel 42, the rotary table 44 rotates anticlockwise (in fig. 8), and the hinge shaft 27 can limit the screw rod 50 to rotate along with the main shaft 43 because the hinge shaft 27 is located in the groove of the connecting seat 51. The main shaft 43 and the lead screw 50 are relatively rotated, and the lead screw 50 slowly moves upwards in the threaded hole through the thread action, so that the hinge shaft 27 is vertically pushed upwards.

The hinge shaft 27 is moved upward by the thrust of the screw 50, however, since the hinge shaft 27 can only move circularly relative to the fixed shaft 23, the upward movement of the hinge shaft 27 can be orthogonally decomposed into a vertical displacement and a horizontal displacement, and the horizontal displacement acts on the translational rack 40 through the connecting seat 51 and the screw 50, so that the translational rack 40 horizontally slides toward the fixed shaft 23 through the sub-chute 16, and the rotary plate 44 is also close to the fixed shaft 23. And vertically displaced so that the included angles (i.e., the starting angles) between the first scissor arm 21 and the second scissor arm 22 and the horizontal plane are increased. When the hinge shaft 27 moves upward, the second scissor arm 22 also drives the translation shaft 24 to approach the center of the turntable 44 along the main sliding groove 15.

The turntable 44 gradually approaches the fixed shaft 23 while rotating, and when the starting angle reaches 20 to 30 degrees, one end part (fig. 8) of the spiral track 45 far away from the center firstly enters the matching groove 72 of the sliding block assembly 17 on the translation shaft 24 counterclockwise, so that the connection between the spiral track 45 and the sliding block assembly 17 on the translation shaft 24 is formed. The subsequent turntable 44 then moves counterclockwise into the mating slot 72 of the slider assembly 17 on the translating shaft 24, such that a connection is formed between the helical track 45 and the slider assembly 17 on the stationary shaft 23. Then, the rotary plate 44 is rotated further, and the lower end of the second scissor arm 22 is moved toward the center of the rotary plate 44 by the screw guide, so that the hinge shaft 27 is moved upward further to be disconnected from the connecting seat 51. As the starting angle is increased, the horizontal force that the spiral track 45 starts to exert is greatly reduced. In addition, in the scheme, the rotating speeds of the turntable 44 and the screw rod 50 are the same, but the vertical moving distance of the hinge shaft 27 is different from front to back, and in the process that the starting angle of the screw rod 50 is increased, the moving speed of the lifting platform 30 is smaller than that of the lifting platform 30 after the spiral track 45 acts, so that the influence of the overhigh initial speed of the lifting platform 30 in the prior art is reduced.

When the folding machine is folded, the motor 41 drives the rotating disc 44 to rotate reversely, the sliding block assemblies 17 on the fixed shaft 23 and the translation shaft 24 are both far away from the center of the rotating disc 44 under the action of the spiral track 45, and the height of the lifting platform 30 is lowered. After the hinge shaft 27 enters the groove of the connecting seat 51, the slide block assemblies 17 on the fixed shaft 23 and the translation shaft 24 are sequentially separated from the spiral track 45, meanwhile, the screw rod 50 and the rotary disc 44 rotate relatively, the screw rod 50 descends slowly, and finally the first scissor arm 21 and the second scissor arm 22 tend to be horizontal.

In order to protect the structures, as shown in fig. 1, a left limiting block 11 and a right limiting block 12 are fixed at the left end and the right end of the base 10, respectively, and after the scissors structure is folded, the lower surface of the lifting platform 30 abuts against the left limiting block 11 and the right limiting block 12.

Example two:

the difference from the first embodiment is that, as shown in fig. 10, two vertical grooves are formed in the connecting seat 51, a sliding-out block 55 is vertically and slidably connected in the vertical grooves, and springs are fixed at the lower ends of the sliding-out block 55 and the bottoms of the vertical grooves. And is engaged with the hinge shaft 27 by a groove formed between the two slide-out blocks 55.

When the scissors structure is folded up, articulated shaft 27 and connecting seat 51 form before being connected, connecting seat 51 follows carousel 44 and rotates, through the setting of roll-off piece 55, can let articulated shaft 27 and roll-off piece 55 offset earlier and push down, in case articulated shaft 27 has aimed at the recess between two roll-off pieces 55 and has got into the recess, roll-off piece 55 accessible spring upwards pops out, lets unable mutual rotation between articulated shaft 27 and the connecting seat 51, plays the effect of connecting. The first embodiment directly adopts the groove arrangement, so that the connection accuracy of the hinge shaft 27 and the connecting seat 51 is improved.

The above are merely examples of the present invention, and common general knowledge of known specific structures and characteristics in the schemes is not described herein. The embodiments described above are only a part of the embodiments of the present invention, and not all of them. 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.

Claims

1. The utility model provides a start steady electronic fork lift platform of cutting, includes the base, and the base top is connected with cuts fork structure and elevating platform, cuts the fork arm group of cutting that the fork structure includes a plurality of interconnect, cuts fork arm group and all includes that first fork arm and second cut the fork arm, and first fork arm of cutting is connected with articulated shaft, its characterized in that with the second fork arm middle part of cutting: an inner groove is formed in the base, a translation shaft and a translation frame are horizontally and slidably connected in the inner groove, a fixed shaft is fixedly connected in the inner groove, and in a scissor arm group connected with the base, a first scissor arm is rotatably connected with the fixed shaft, and a second scissor arm is rotatably connected with the translation shaft; the translation frame is rotatably connected with a main shaft, the main shaft is fixedly connected with a turntable, a spiral track is fixed on the turntable, a motor for driving the turntable to rotate is further fixed on the translation frame, and sliding block assemblies capable of being in sliding connection with the spiral track are fixed on the fixed shaft and the translation shaft; the center of the rotary table is connected with a vertically arranged screw rod, and a connecting piece which can be connected with the articulated shaft is connected on the screw rod;

the base is provided with a sunken inner groove, a fixed shaft and a translation shaft are arranged in the inner groove, two ends of the fixed shaft are fixedly connected with the side wall of the inner groove, a main sliding groove is fixed on the side wall of the inner groove, the main sliding groove is connected with a translation block in a sliding manner, two ends of the translation shaft are fixedly connected with the translation block, the translation shaft and the fixed shaft are always positioned on the same horizontal plane, in a scissor arm group connected with the base, the lower end of a first scissor arm is rotatably connected with the fixed shaft, and the lower end of a second scissor arm is rotatably connected with the translation shaft;

the improved inner groove structure is characterized in that an auxiliary sliding groove is fixedly connected to the side wall of the inner groove, two sliding blocks are slidably connected to the auxiliary sliding groove, a translation frame is fixedly connected with a translation frame, a main shaft is rotatably connected to the translation frame through a bearing, a driven chain wheel and a rotary table are connected to the upper portion of the main shaft in a key mode, the driven chain wheel is located below the rotary table, a motor is fixedly connected to the translation frame through a bolt, an output shaft of the motor is rotatably connected to the translation frame through a bearing, a driving chain wheel is fixedly connected to the output shaft, and the driving chain wheel and the driven chain wheel are in chain transmission.

2. An electric scissor lift platform that starts smoothly as claimed in claim 1 wherein: the spindle is axially provided with a threaded hole, the screw rod is in threaded connection with the threaded hole, and the connecting piece is fixed with the upper end of the screw rod.

3. An electric scissor lift platform that starts smoothly as claimed in claim 2 wherein: the connecting piece includes the connecting seat, is equipped with the recess that the articulated shaft can get into on the connecting seat.

4. An electric scissor lift platform that starts smoothly as claimed in claim 2 wherein: the connecting piece includes the connecting seat, is equipped with vertical groove on the connecting seat, and vertical inslot sliding connection has the roll-off piece, and the lower extreme of roll-off piece and the bottom in vertical groove are fixed with the elastic component.

5. An electric scissor lift platform that starts smoothly according to claim 3 or 4 wherein: the sliding block assembly comprises an installation beam, a matching block is fixed on the installation beam, and a matching groove which can be entered by the spiral track is formed in the matching block.

6. An electric scissor lift platform that starts smoothly as claimed in claim 5 wherein: and an arc-surface contact block is fixed on the side wall of the matching groove.

7. An electric scissor lift platform that starts smoothly as claimed in claim 6 wherein: and a driving chain wheel is fixed on an output shaft of the motor, a driven chain wheel is fixed on the main shaft, and a chain is connected between the driving chain wheel and the driven chain wheel.

8. An electric scissor lift platform that starts smoothly as claimed in claim 7 wherein: a limiting block is fixed on the base, and the lower surface of the lifting platform can be abutted against the limiting block.