CN213034913U

CN213034913U - Board severing machine with shaking prevention function

Info

Publication number: CN213034913U
Application number: CN202021135723.XU
Authority: CN
Inventors: 吴逸中; 谢沛文; 薛成
Original assignee: Jiangsu Teeyer Intelligent Equipment Co ltd
Current assignee: Jiangsu Teeyer Intelligent Equipment Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-04-23
Anticipated expiration: 2030-06-18

Abstract

The utility model belongs to the technical field of trigger equipment is broken off with the fingers and thumb, in particular to trigger with prevent shaking function breaks off with the fingers and thumb, the mounting bracket below is equipped with elevating gear, the elevating gear top is equipped with conveying mechanism, the last aerated block of having placed of conveying mechanism is piled, the mounting bracket includes fixed frame and sets up in the movable frame of fixed frame top, link to each other through first cylinder between fixed frame and the movable frame, the last symmetry of movable frame is provided with two rows of second cylinders, the last symmetry of fixed frame is provided with two rows of third cylinders, both sides that lie in the elevating gear symmetry below the mounting bracket respectively are equipped with one row of vertical gag lever post.

Description

Board severing machine with shaking prevention function

Technical Field

The utility model belongs to the technical field of trigger equipment is broken off with fingers and thumb, in particular to trigger is broken off with fingers and thumb with prevent shaking function.

Background

The air-entraining block is a light porous novel building section bar and has good heat insulating property and sound absorbing property. After the aerated block comes out of the steam curing kettle, the upper layer and the lower layer of the aerated block are often adhered together, which brings inconvenience to subsequent processing, selling, application and other links. In this regard, manual separation not only requires a corresponding amount of labor and effort, but also is prone to damage to the surface or structure of the aerated mass during operation. The separation of the aerated mass using the severing machine therefore takes place.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the scheme is as follows: after the aerated block comes out of the steam curing kettle, the upper layer and the lower layer of the aerated block are often adhered together, which brings inconvenience to the subsequent processes, sales, application and the like, therefore, the manual separation not only needs corresponding manpower and labor intensity, but also easily damages the surface or the structure of the aerated block in the operation process,

in order to solve the technical problem, the utility model provides a wrestling machine with shaking prevention function, which comprises a mounting frame, a lifting device is arranged below the mounting frame, a conveying mechanism is arranged at the top of the lifting device, an air-adding block stack is arranged on the conveying mechanism, the air-adding block stack is formed by stacking a plurality of air-adding blocks which are horizontally arranged from bottom to top in sequence, the lifting device vertically ascends and descends and drives the conveying mechanism and the air-adding block stack to synchronously reciprocate, the air-adding block stack is supported to enter a cavity surrounded by the mounting frame when the lifting device vertically ascends,

the mounting rack comprises a fixed frame and a movable frame arranged above the fixed frame, the fixed frame is connected with the movable frame through a first air cylinder, the movable frame can move downwards to be close to the fixed frame or move upwards to be far away from the fixed frame under the driving of the first air cylinder,

two rows of second cylinders are symmetrically arranged on the movable frame, a second telescopic rod on each second cylinder extends inwards and can clamp and fix the air-adding block on the same horizontal height with the second cylinder,

two rows of third cylinders are symmetrically arranged on the fixed frame, a third telescopic rod on each third cylinder extends inwards and can clamp and fix an air-entraining block which is close to the lower part of the air-entraining block clamped and fixed by the second telescopic rod,

and a row of vertical limiting rods are respectively arranged at two symmetrical sides of the lifting device below the mounting frame.

Preferably, the method comprises the following steps: the conveying mechanism comprises a plurality of rollers which are horizontally arranged from left to right and arranged at the top of the lifting device, each roller is horizontally arranged in the axial direction in the front-back direction, the conveying plates are arranged on each roller in a matching way,

the conveying plate comprises a horizontal strip-shaped supporting plate with the length direction in the left-right direction, the aerated block stack is placed on the upper plate surface of the supporting plate, a guide rail with the length direction parallel to the upper part and the lower part of the supporting plate is formed by downward protrusion on the lower plate surface of the supporting plate, the rolling shafts axially close to the shaft bodies at two ends are radially outward protruded to form limiting rings, and the guide rail is downwards embedded between the two limiting rings on each rolling shaft;

preferably, the method comprises the following steps: the fixed frame and the movable frame are both horizontally arranged rectangular frames, the outer plate surfaces at the left side and the right side of the fixed frame are respectively hinged with a first air cylinder, each first air cylinder extends upwards to form a first telescopic rod, one end of each first telescopic rod, which is far away from the first air cylinder, is hinged with the outer side surface of the movable frame,

the outer plate surfaces of the left side and the right side of the fixed frame are respectively and fixedly connected with a connecting seat, the connecting seat vertically extends upwards to form a positioning rod, the outer plate surfaces of the left side and the right side of the movable frame are respectively and fixedly connected with hole seats corresponding to the positioning rod, and when the movable frame moves upwards or downwards, the positioning rod is vertically upwards matched and just penetrates through the corresponding hole seat;

preferably, the method comprises the following steps: the frame on the front side and the frame on the rear side of the movable frame are respectively and fixedly provided with a second cylinder, a second telescopic rod horizontally and inwards extends from each second cylinder, one end of each second telescopic rod, which is far away from the second cylinder, is fixedly connected with a vertical second top plate, the second telescopic rod is vertical to the plate surface of the second top plate in the length direction, and each second cylinder can clamp and fix an air-adding block which is at the same horizontal height with the second cylinder through the second telescopic rod and the second top plate;

preferably, the method comprises the following steps: the frame on the front side and the frame on the rear side of the fixed frame are respectively fixedly provided with a third cylinder, a third telescopic rod horizontally and inwards extends from each third cylinder, one end of each third telescopic rod far away from the third cylinder is fixedly connected with a vertical third top plate, the third telescopic rod is vertical to the plate surface of the third top plate in the length direction, and each third cylinder can clamp and fix an air-adding block which is close to the lower part of the air-adding block clamped and fixed by the second telescopic rod through the third telescopic rod and the third top plate;

preferably, the method comprises the following steps: two rows of limiting rods are respectively arranged at the front side and the rear side of the lifting device.

The beneficial effect of this scheme lies in: when the device is operated, the supporting plate on which the aerated block pile is stacked can be matched and embedded between the two limiting rings on the rolling shaft leftwards or rightwards by the trolley, the bottom of the right end or the left end of the supporting plate is supported upwards by the limiting rings, the rolling shafts are started to rotate axially, so that the supporting plate is dragged to the position right below the mounting rack until the aerated block pile basically reaches the position right below the mounting rack, the trolley is removed,

the air-adding block stack is formed by flatly placing a plurality of cuboid air-adding blocks with the same specification and orderly stacking the cuboid air-adding blocks from bottom to top in sequence (each cuboid air-adding block is placed in a left-right direction according to the length direction and in a front-back direction according to the width direction), the supporting plate and the air-adding block stack are lifted upwards through the lifting device and enter a cavity defined by the mounting frame until the top layer air-adding block stays at a horizontal height position which is almost the same as that of a second air cylinder, second telescopic rods on the front side and the back side horizontally extend inwards, the top layer air-adding block is clamped and fixed through a second top plate, and the second top plate is ensured not to touch a second layer air-adding block which is close to the lower part of; then, third telescopic rods on the front side and the rear side horizontally extend inwards, and the second layer of air-entrapping blocks are clamped and fixed through a third top plate, so that the third top plate is ensured not to touch the upper top layer of air-entrapping blocks; then the first telescopic rod extends upwards, the fixed frame is fixed, the movable frame vertically moves upwards to be far away from the fixed frame, the top layer air-entraining block is synchronously separated from the second layer air-entraining block which is immediately below, and the separation operation eliminates the adsorption force between the top layer air-entraining block and the second layer air-entraining block;

then, the first telescopic rod retracts to enable the movable frame to move downwards and reset, the top layer air-adding block is placed on the second layer air-adding block again, the second telescopic rod and the third telescopic rod retract to release the top layer air-adding block and the second layer air-adding block, the lifting device is lifted again, the second layer air-adding block stays at the position with the horizontal height being almost the same as that of the second air cylinder, the second layer air-adding block and the third layer air-adding block which is close to the lower part of the second layer air-adding block are respectively and independently clamped through the second telescopic rod and the third telescopic rod, then the first air cylinder drives the second layer air-adding block and the third layer air-adding block to separate and eliminate the adsorption force between the second layer air-adding block and the third layer air-adding block, after the adsorption force between the air-adding blocks in the air-adding block stack is eliminated one by one time, the lifting device is lowered to the initial position once, each roller shaft is started to axially rotate, the supporting plate and the air-adding block stack above the supporting, and changing the next air adding block stack into the position right below the mounting frame to continue the separation.

Among the above-mentioned device, the mode that the adoption goes up and down to the aerated block heap makes the aerated block heap get into the separation station or leave the station, and the aerated block on elevating gear and elevating gear in this scheme is piled the front and back both sides of all fixed vertical gag lever post row that is equipped with, is used for preventing that the aerated block from piling the lift in-process and taking place to rock, because rock the degree of alignment that makes between each aerated block easily and descend, makes the skew anticipated position of aerated block, leads to the cylinder to the aerated block centre gripping unstability.

Drawings

Fig. 1 is a schematic structural view of the inventive trigger with shaking prevention (for the sake of clarity, the lifting device and the left stop lever 8 and the connecting rod 12 are not shown),

FIG. 2 is a front cross-sectional view of the plate severing machine with shaking prevention of the present invention,

FIG. 3 is a right side sectional view of the inventive trigger with shaking prevention function,

FIG. 4 is a schematic view of the anti-shaking apparatus for separating aerated block pile according to the present invention shown in FIG. 3,

fig. 5 is a schematic structural diagram of the actual device of the inventive trigger with shaking prevention function (the second cylinder 6 and the third cylinder 7 are not installed, and the position of the limiting rod 8 is yet to be adjusted),

1-lifting device, 2-air-cushion pile, 21-top-layer air-cushion, 22-second-layer air-cushion, 23-third-layer air-cushion, 3-fixed frame, 31-connecting seat, 32-positioning rod, 33-supporting leg, 34-cross bar, 4-movable frame, 41-hole seat, 5-first cylinder, 51-first telescopic rod, 6-second cylinder, 61-second telescopic rod, 62-second top plate, 7-third cylinder, 71-third telescopic rod, 72-third top plate, 8-limiting rod, 9-hinged seat, 10-rolling shaft, 101-limiting ring, 11-supporting plate, 111-guide rail, 12-connecting rod, 13-ground.

Detailed Description

It should be noted that the words "front", "back", "left" and "right" used in the description of the invention refer to directions in the drawings, and "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component, and are used merely for convenience in describing the invention and to simplify the description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

As shown in the accompanying drawings, the inventive trigger with shaking prevention function firstly comprises a mounting rack with a rectangular horizontal plane, a lifting device 1 is arranged under the mounting rack, the top of the lifting device 1 is a lifting platform with a horizontal surface, a plurality of rollers 10 are horizontally arranged on the platform from left to right, each roller 10 is horizontally arranged in the axial direction from front to back, each roller 10 axially protrudes outwards along the shaft body near two ends along the axial direction to form a limit ring 101, each roller 10 can axially rotate on the platform (the rollers 10 are driven by a motor to axially rotate, which is not shown in the figure), and each roller 10 jointly forms a roller group; a horizontal strip-shaped supporting plate 11 with the length direction in the left-right direction is arranged above the roller group, a guide rail 111 with the length direction parallel to the supporting plate 11 up and down is formed by protruding the lower plate surface of the supporting plate 11 downwards, the guide rail 111 is downwards and simultaneously embedded between two limiting rings 101 on each roller 10 in a matching way, when the rollers 10 axially rotate, the supporting plate 11 is driven to reciprocate left and right, and when the rollers 10 do not rotate, a larger friction force is generated between the bottom of the supporting plate 11 and the arc surface of the limiting rings 101 based on the downward pressing weight of an air adding block stack 2 arranged on the supporting plate 11, so that the supporting plate 11 is prevented from sliding left and right on the roller group; the upper plate surface of the supporting plate 11 is provided with an air-adding block stack 2, the air-adding block stack 2 is formed by horizontally placing a plurality of air-adding blocks with the same specification from bottom to top in sequence, the lifting device 1 vertically lifts up and down and drives the air-adding block stack 2 to synchronously move up and down, the lifting device 1 supports the air-adding block stack 2 to enter a cavity surrounded by the mounting rack when vertically lifting,

the mounting frame comprises a fixed frame 3 and a movable frame 4 arranged right above the fixed frame 3, the fixed frame 3 and the movable frame 4 are rectangular frames which are horizontally arranged on the whole, two first air cylinders 5 are respectively hinged on the vertical outer plate surfaces on the left side and the right side of the fixed frame 3, a first telescopic rod 51 extends upwards from each first air cylinder 5, one end of each first telescopic rod 51 far away from the first air cylinder 5 is connected with the corresponding vertical outer side surface on the movable frame 4 through a hinged seat 9, a connecting seat 31 is respectively fixedly welded on the vertical outer plate surfaces on the left side and the right side of the fixed frame 3, a positioning rod 32 extends upwards from the connecting seat 31, hole seats 41 corresponding to the positioning rod 32 are respectively welded on the vertical outer plate surfaces on the left side and the right side of the movable frame 4, the positioning rod 32 is vertically upwards matched with and rightly inserted in the corresponding hole seat 41 all the time, and is matched with the positioning action of the positioning rod 32, the movable frame 4 can be moved vertically downward close to the fixed frame 3 or vertically upward away from the fixed frame 3,

the two ends of the first cylinder 5 are hinged with the mounting rack for convenient installation and construction, and the positioning rods 32 symmetrically arranged at the left side and the right side can keep the movable frame 4 to be always positioned right above the fixed frame 3 without deviation when moving up and down, thus making up the defect of hinging,

a row of second cylinders 6 are fixedly arranged on the front frame of the movable frame 4 along the length direction of the frame, second telescopic rods 61 extend horizontally and forwardly from the second cylinders 6, a row of second cylinders 6 are also fixedly arranged on the rear frame of the movable frame 4 along the length direction of the frame, second telescopic rods 61 extend horizontally and forwardly from the second cylinders 6, one ends of all the second telescopic rods 61 far away from the second cylinders 6 are fixedly connected with vertical second top plates 62, the second telescopic rods 61 are perpendicular to the plate surfaces of the second top plates 62 in the length direction, each second telescopic rod 61 extends forwards/backwards from the second cylinder 6 so as to clamp and fix the air-adding blocks on the same horizontal height with the second cylinders 6 through the second top plates 62,

a row of third cylinders 7 is fixedly mounted on the front frame of the fixed frame 3 along the length direction of the frame, third telescopic rods 71 horizontally and forwardly extend from the third cylinders 7, a row of third cylinders 7 is also fixedly mounted on the rear frame of the fixed frame 3 along the length direction of the frame, third telescopic rods 71 horizontally and forwardly extend from the third cylinders 7, one ends of all the third telescopic rods 71, which are far away from the third cylinders 7, are fixedly connected with vertical third top plates 72, the third telescopic rods 71 are perpendicular to the plate surfaces of the third top plates 72 in the length direction, and the third telescopic rods 71 forwardly/forwardly and rearwardly extend out of the third cylinders 7 so as to clamp and fix the air-adding blocks, which are close to the lower sides of the air-adding blocks clamped and fixed by the second telescopic rods 61, through the third top plates 72;

supporting legs 33 supported on the ground vertically extend downwards from four corners of the fixed frame 3, two supporting legs 33 at the front side are fixedly connected through horizontal cross bars 34, two cross bars 34 are arranged up and down, two supporting legs 33 at the rear side are also fixedly connected through two horizontal cross bars 34 arranged up and down,

the mounting bracket below is equipped with one row of gag lever post 8 respectively in the front and back both sides of elevating gear 1, about every row of gag lever post 8 has two, the vertical setting of gag lever post 8, and on 8 pole bodies of each gag lever post were all fixed in two horizontal poles 34 on the upper and lower of front side or rear side through the connecting rod 12 of level setting, gag lever post 8 and connecting rod 12 all were located horizontal pole 34 inboardly, and 8 tops of gag lever post extend to and are close to fixed frame 3 bottoms in height.

When the device is operated, the supporting plate 11 on which the aerated block pile 2 is stacked can be matched and embedded between the two limiting rings 101 on the rolling shafts 10 leftwards or rightwards through the guide rail 111 by using the cart, the bottom of the right end or the left end of the supporting plate 11 is supported upwards by the limiting rings 101, each rolling shaft 10 is started to rotate axially, the supporting plate 11 is dragged to the position right below the mounting rack until the aerated block pile 2 basically reaches the position right below the mounting rack and then is stopped, the cart is removed,

the air-adding block stack 2 is formed by flatly placing a plurality of cuboid air-adding blocks with the same specification and orderly stacking from bottom to top (each cuboid air-adding block is placed forward from left to right in the length direction and from front to back in the width direction), the supporting plate 11 and the air-adding block stack 2 are lifted upwards through the lifting device 1 and enter a cavity defined by the mounting frame until the top layer air-adding block 21 stays at a horizontal height position which is almost the same as that of the second cylinder 6, the second telescopic rods 61 at the front side and the back side horizontally extend inwards and clamp and fix the top layer air-adding block 21 through the second top plate 62, and the second top plate 62 is ensured not to touch the second layer air-adding block 22 which is close to the lower part of the top layer air-adding block 21; then, the third telescopic rods 71 at the front side and the rear side horizontally extend inwards and clamp and fix the second layer of air-entrapping blocks 22 through the third top plate 72, and the third top plate 72 is also ensured not to touch the upper top layer air-entrapping block 21; then, the fixed frame 3 does not move by extending the first telescopic rod 51 upwards, and the movable frame 4 vertically moves upwards to be far away from the fixed frame 3, so that the top layer air-entraining block 21 and the second layer air-entraining block 22 which is immediately below are synchronously separated, and the separation operation eliminates the adsorption force between the top layer air-entraining block 21 and the second layer air-entraining block 22;

then, the first telescopic rod 51 retracts to move the movable frame 4 downwards for resetting, the top layer air-adding block 21 is placed on the second layer air-adding block 22 again, the second telescopic rod 61 and the third telescopic rod 71 retract to release the top layer air-adding block 21 and the second layer air-adding block 22, the lifting device 1 is lifted again, the second layer air-adding block 22 stays at a position with a horizontal height which is almost the same as that of the second air cylinder 6, the second layer air-adding block 22 and the third layer air-adding block 23 which is close to the lower part of the second layer air-adding block 22 are respectively and independently clamped through the second telescopic rod 61 and the third telescopic rod 71, then the first air cylinder 5 drives the second layer air-adding block 22 and the third layer air-adding block 23 to separate and eliminate the adsorption force between the two, in such a cycle, after the adsorption force among the air-adding blocks in the air-adding block pile 2 is eliminated one by one, the lifting device 1 once descends to the initial position, each 10 is started to axially rotate, the supporting plate 11 and the air-adding block stack 2 on the supporting plate are pushed away from the roller group leftwards or rightwards and are caught by a discharging cart, and the next air-adding block stack 2 enters the position right below the mounting frame to be continuously separated.

Among the above-mentioned device, the mode that the adoption goes up and down to the aerated block heap 2 makes the aerated block heap 2 get into the separation station or leave the station, the aerated block on elevating gear 1 and elevating gear 1 in this scheme is piled 2 front and back both sides and is all fixed and be equipped with 8 rows of vertical gag lever posts, be used for preventing that the aerated block from piling 2 lift in-process and taking place to rock, because rock the alignment degree that makes between each aerated block easily and descend, make the skew anticipated position of aerated block, lead to the cylinder to the aerated block centre gripping unstability.

Claims

1. The utility model provides a trigger off with fingers and thumb with prevent shaking function which characterized in that: the board severing machine comprises a mounting frame, a lifting device (1) is arranged below the mounting frame, a conveying mechanism is arranged at the top of the lifting device (1), an aerated block stack (2) is placed on the conveying mechanism, the aerated block stack (2) is formed by sequentially stacking multiple aerated blocks which are kept flat from bottom to top, the lifting device (1) vertically ascends and descends and drives the conveying mechanism and the aerated block stack (2) to synchronously move up and down, the aerated block stack (2) is supported to enter a cavity surrounded by the mounting frame when the lifting device (1) vertically ascends,

the mounting frame comprises a fixed frame (3) and a movable frame (4) arranged above the fixed frame (3), the fixed frame (3) is connected with the movable frame (4) through a first air cylinder (5), the movable frame (4) can move downwards to be close to the fixed frame (3) or move upwards to be far away from the fixed frame (3) under the driving of the first air cylinder (5),

two rows of second cylinders (6) are symmetrically arranged on the movable frame (4), a second telescopic rod (61) on each second cylinder (6) extends inwards and can clamp and fix the air-adding block on the same horizontal height with the second cylinders (6),

two rows of third cylinders (7) are symmetrically arranged on the fixed frame (3), a third telescopic rod (71) on each third cylinder (7) extends inwards and can also clamp and fix the air-entrapping block which is close to the lower part of the air-entrapping block clamped and fixed by the second telescopic rod (61),

and a row of vertical limiting rods (8) are respectively arranged on two symmetrical sides of the lifting device (1) below the mounting frame.

2. The board wrestling machine with shaking prevention function as claimed in claim 1, wherein: the conveying mechanism comprises a plurality of rollers (10) which are horizontally arranged from left to right and arranged at the top of the lifting device (1), each roller (10) is horizontally arranged in the front-back direction in the axial direction, a conveying plate is arranged on each roller (10) in a matching way,

the conveying plate comprises a horizontal strip-shaped supporting plate (11) with the length direction being left and right, the aerated block stack (2) is placed on the upper plate surface of the supporting plate (11), the lower plate surface of the supporting plate (11) protrudes downwards to form a guide rail (111) with the length direction being parallel to the supporting plate (11) up and down, the shaft body of the roller (10) close to two ends along the axial direction protrudes outwards along the radial direction to form limiting rings (101), and the guide rail (111) is embedded between the two limiting rings (101) on the roller (10) downwards in a matched manner.

3. The board wrestling machine with shaking prevention function as claimed in claim 1, wherein: the fixed frame (3) and the movable frame (4) are both horizontally arranged rectangular frames, the first cylinders (5) are respectively hinged on the outer plate surfaces of the left side and the right side of the fixed frame (3), each first cylinder (5) extends upwards to form a first telescopic rod (51), one end of each first telescopic rod (51) far away from the first cylinder (5) is hinged with the outer side surface of the movable frame (4),

the fixed frame (3) is characterized in that the outer plate surfaces of the left side and the right side of the fixed frame (3) are respectively and fixedly connected with a connecting seat (31), the connecting seat (31) vertically extends upwards to form a positioning rod (32), the outer plate surfaces of the left side and the right side of the movable frame (4) are respectively and fixedly connected with hole seats (41) corresponding to the positioning rod (32), and when the movable frame (4) moves upwards or downwards, the positioning rod (32) is always vertically upwards matched and just penetrates through the hole seats (41) corresponding to the positioning rod.

4. The board wrestling machine with shaking prevention function as claimed in claim 1, wherein: the frame of the front side and the rear side of the movable frame (4) is respectively and fixedly provided with the second air cylinders (6), each second air cylinder (6) horizontally and inwards extends out of the second telescopic rod (61), one end of each second telescopic rod (61) far away from the second air cylinder (6) is fixedly connected with a vertical second top plate (62), the second telescopic rods (61) are perpendicular to the plate surface of the second top plate (62) in the length direction, and each second air cylinder (6) can clamp and fix the air-adding blocks on the same horizontal height with the second air cylinders (6) through the second telescopic rods (61) and the second top plate (62).

5. The board wrestling machine with shaking prevention function as claimed in claim 1, wherein: the frames on the front side and the rear side of the fixed frame (3) are respectively and fixedly provided with the third cylinders (7), each third cylinder (7) horizontally and inwards extends to form a third telescopic rod (71), one end of each third telescopic rod (71) far away from the third cylinder (7) is fixedly connected with a vertical third top plate (72), the third telescopic rods (71) are perpendicular to the plate surface of the third top plate (72) in the length direction, and each third cylinder (7) can also clamp and fix the air-adding block which is close to the lower part of the air-adding block and clamped and fixed by the second telescopic rod (61) through the third telescopic rods (71) and the third top plate (72).

6. The board wrestling machine with shaking prevention function as claimed in claim 1, wherein: the two rows of limiting rods (8) are respectively arranged on the front side and the rear side of the lifting device (1).