CN222007222U

CN222007222U - A material loading lifting machine for photovoltaic module packing

Info

Publication number: CN222007222U
Application number: CN202420600632.0U
Authority: CN
Inventors: 周孝辉; 张晋荣; 廖常峰; 王丽
Original assignee: Hangzhou Chengzhi Intelligent Equipment Co ltd
Current assignee: Hangzhou Chengzhi Intelligent Equipment Co ltd
Priority date: 2024-03-27
Filing date: 2024-03-27
Publication date: 2024-11-15
Anticipated expiration: 2034-03-27

Abstract

The utility model discloses a loading and lifting machine for packaging photovoltaic components, comprising a frame, a guide slide mechanism 1 is symmetrically provided on the top of the frame, a transfer rack is slidably provided on the guide slide mechanism 1, a driving mechanism is provided on one side of the transfer rack, a guide slide mechanism 2 is symmetrically provided on the inner side wall of the transfer rack, a fork lifting rack is slidably provided on the guide slide mechanism 2, the bottom of the transfer rack is connected with the top of the fork lifting rack through a telescopic component, the position relationship between the fork and the iron support is adjusted by controlling the extension and contraction of an oil cylinder 1, and then the transfer driving shaft is driven to rotate by starting a motor 1 to make the transfer rack slide along a guide rail 1 toward one side of the iron support, the fork is inserted into the appropriate position inside the iron support, and then the product is transported to the conveyor line by controlling the motor 1 and the oil cylinder 1, so as to realize the automatic loading operation of the product, avoid consuming a lot of manpower and material costs, and can also adjust the speed synchronization with the processing equipment during the loading process, so as to improve the rate of packaging the photovoltaic panels.

Description

A material loading lifting machine for photovoltaic module packing

Technical Field

The utility model relates to the technical field of feeding equipment, in particular to a feeding elevator for packaging photovoltaic modules.

Background

On the photovoltaic module packaging line, carry photovoltaic module through the tray generally, the last photovoltaic module of tray is through the final completion of multichannel process twines the membrane packing, before packing photovoltaic module, need earlier with photovoltaic module flattening, avoid the photovoltaic module after the packing to be uneven, cause colliding with easily, influence pleasing to the eye etc. while prior art is difficult to realize leveling before the photovoltaic module packing, and adopt fork truck to its material loading when packing photovoltaic module, not only inefficiency through fork truck material loading, still need consume a large amount of manpower, material resources cost, the material loading in-process also is difficult to realize with the speed synchronization of processing equipment, influence the speed of photovoltaic module packing.

Disclosure of utility model

The utility model aims to provide a feeding elevator for packaging a photovoltaic module, which aims at solving the problems that leveling of the photovoltaic module before packaging is difficult to achieve, and time and labor are wasted when the photovoltaic module is fed by a forklift in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a material loading lifting machine for photovoltaic module packing, includes the frame, frame top symmetry is equipped with leads smooth mechanism one, it is equipped with to lead to slide mechanism one and moves and carry the frame to slide, it is equipped with actuating mechanism to move and carry frame one side, it is equipped with leads smooth mechanism two to move the frame inside wall symmetry, it is equipped with the support fork crane to lead to slide on the mechanism two, move and carry the frame bottom through telescopic assembly with support fork crane top is connected, support fork crane bottom is equipped with the fork, the frame is kept away from move and carry frame one side and be equipped with tilting mechanism, tilting mechanism side symmetry is equipped with side pushing mechanism.

Preferably, the first guide and slide mechanism comprises a first guide rail symmetrically arranged at the top of the frame, a limiting block is arranged at one end of the first guide rail, and a plurality of first sliding blocks fixedly connected with the top of the transfer frame are arranged on the first guide rail in a sliding manner.

Preferably, the driving mechanism comprises mounting seats symmetrically arranged on the side edges of the top of the transfer frame, transfer driving shafts are rotatably arranged in the middle of the mounting seats on two sides, gears are arranged at the ends of the transfer driving shafts, racks meshed with the gears are arranged on the top of the frame, a first speed reducer is arranged in the middle of the transfer driving shafts, and a first motor is arranged on the side edge of the first speed reducer.

Preferably, the second guide and slide mechanism comprises a plurality of second guide rails arranged on the side edges of the fork lifting frame, and a plurality of second slide blocks fixedly connected with the transfer frame are arranged on each second guide rail in a sliding mode.

Preferably, the telescopic assembly comprises a plurality of first oil cylinders arranged at the bottom of the transfer frame, and the telescopic ends of the first oil cylinders are connected with the top of the fork lifting frame.

Preferably, a scanning mechanism is arranged on one side of the frame, the scanning mechanism comprises a mounting column arranged on the side edge of the frame, a driving cavity is formed in the inner side of the mounting column, a guide rail III is symmetrically arranged at the opening of the driving cavity, a plurality of sliding blocks III are slidably arranged on the guide rail III, lifting seats are commonly connected with the sliding blocks, seat rods are symmetrically clamped on one side of the lifting seats, cylinder seats are arranged at the end parts of the seat rods in a clamping mode, gun seats are slidably arranged on one side of the cylinder seats, telescopic ends are arranged on one side of the cylinder seats and fixedly connected with first cylinders of the gun seats, a code scanning gun is arranged on one side of the gun seats, driving shafts are rotatably arranged at the top and the bottom of the driving cavity, chain wheels are arranged in the middle of the driving shafts, two sides of the chain wheels are connected through chain transmission, the lifting seats are fixedly connected with the chain, second reducers are connected with the end parts of the driving shafts, and second motors are arranged on the two sides of the speed reducers.

Preferably, the turnover mechanism comprises a fixed seat arranged at the bottom of one side of the frame far away from the transfer frame, a turnover main shaft is arranged in the middle of the fixed seat, clamping plates are symmetrically arranged at the middle of the turnover main shaft, mounting plates are symmetrically arranged at one side of the bottom of the frame, the clamping plates are connected with the mounting plates through oil cylinders II, turnover plates are symmetrically arranged at the turnover main shaft, mounting beams are connected to the turnover plates on two sides of the turnover main shaft, a pressing shaft is arranged at one side of the turnover main shaft far away from the turnover plates, a pulling seat is symmetrically arranged on the outer circumferential wall of the pressing shaft, a telescopic end is arranged with a cylinder II fixedly connected with the pulling seat, swing arms are arranged at the ends of the pressing shafts, compression rollers are arranged at the tops of the swing arms II, and a speed reducer III is arranged at one end of the turnover main shaft.

Preferably, the side pushing mechanism comprises side pushing frames arranged on the side edges of the frame, guide cylinders are symmetrically arranged at the tops of the side pushing frames, guide shafts are arranged in the guide cylinders in a sliding mode, side pushing plates are arranged at the two sides of the guide shafts in a connecting mode towards the inner ends of the guide shafts, and telescopic ends are symmetrically arranged on the side pushing frames and fixedly connected with air cylinders III of the side pushing plates.

Preferably, the side pushing plate is provided with a buffer pad on the inward side.

Preferably, balance forks are symmetrically arranged at the bottom of the fork lifting frame.

The utility model has the beneficial effects that:

1. The first control motor and the first oil cylinder are used for conveying the photovoltaic module to the conveying line, so that automatic feeding operation of the photovoltaic module is realized, a large amount of manpower and material resource cost is avoided, speed synchronization with processing equipment can be regulated in the feeding process, and the packing speed of the photovoltaic module is improved.

2. The second motor drives the same-side driving shaft to rotate, so that the chain is driven to control the lifting seat to lift, the control cylinder stretches out and draws back, the distance between the code scanning gun and the photovoltaic module is adjusted, and the code scanning registration is carried out on the photovoltaic module in the feeding process.

3. Through control cylinder two and cylinder two are flexible, and then compress tightly the photovoltaic module on the iron support to on the turnover plate to overturn, rethread control cylinder three is flexible, makes the side push pedal carry out the flattening with the photovoltaic module on the turnover plate and handles, prevents that photovoltaic module is uneven, causes to collide with easily when packing, and influences photovoltaic module and pleasing to the eye etc..

4. The side push plate is equipped with the blotter to one side inwards, the blotter includes but is not limited to PU pad, prevents through adopting the blotter that the side push plate from causing the damage to photovoltaic module in the flattening process.

Drawings

FIG. 1 is a diagram illustrating an embodiment of the present utility model;

FIG. 2 is a schematic view of a first perspective view of an embodiment of the present utility model;

FIG. 3 is a schematic view of a second perspective view of an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional perspective view of an embodiment of the present utility model;

FIG. 5 is an enlarged schematic view of the structure at A according to an embodiment of the present utility model;

FIG. 6 is an enlarged schematic view of the structure of the embodiment of the present utility model at B;

FIG. 7 is an enlarged schematic view of the structure of the embodiment of the present utility model at C;

FIG. 8 is an enlarged schematic view of the structure of the embodiment of the utility model at D;

Fig. 9 is an enlarged schematic view of the structure at E according to an embodiment of the present utility model.

In the figure: 1. a frame; 2. a first slide guiding mechanism; 201. a first guide rail; 202. a limiting block; 203. a first sliding block; 3. a transfer rack; 4. a driving mechanism; 41. a mounting base; 42. a transfer driving shaft; 43. a gear; 44. a rack; 45. a first speed reducer; 46. a first motor; 5. a second slide guiding mechanism; 51. a second guide rail; 52. a second slide block; 6. a fork lifting frame; 7. an oil cylinder I; 8. a fork; 9. a turnover mechanism; 91. a fixing seat; 92. turning over the main shaft; 93. a clamping plate; 94. a mounting plate; 95. a second oil cylinder; 96. a turnover plate; 97. a speed reducer III; 10. a side pushing mechanism; 101. a side pushing frame; 102. a guide cylinder; 103. a guide shaft; 104. a side push plate; 105. a third cylinder; 11. a scanning mechanism; 111. a mounting column; 112. a drive chamber; 113. a guide rail III; 114. a third slide block; 115. a lifting seat; 116. a seat rod; 117. a cylinder block; 118. a gun seat; 1181. a code scanning gun; 119. a first cylinder; 12. a drive shaft; 13. a sprocket; 14. a chain; 15. a connecting block; 16. a second speed reducer; 17. a second motor; 18. mounting a beam; 19. pressing a shaft; 20. a pull seat; 21. a second cylinder; 22. swing arms; 23. a press roller; 24. a cushion pad; 25. a balance fork; 26. and (5) conveying a line.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, the utility model provides a feeding hoist for packaging photovoltaic modules, which comprises a frame 1, wherein a first guide and sliding mechanism 2 is symmetrically arranged at the top of the frame 1, a second guide and sliding mechanism 5 is symmetrically arranged on the inner side wall of the first guide and sliding mechanism 2, a driving mechanism 4 is arranged on one side of the second guide and sliding mechanism 3, a fork lifting frame 6 is slidably arranged on the second guide and sliding mechanism 5, the bottom of the second guide and sliding mechanism 3 is connected with the top of the fork lifting frame 6 through a telescopic component, a fork 8 is arranged at the bottom of the fork lifting frame 6, a turnover mechanism 9 is arranged on one side, away from the first guide and sliding mechanism 3, of the frame 1, and a side pushing mechanism 10 is symmetrically arranged on the side edge of the turnover mechanism 9.

As shown in fig. 6, specifically, the first slide guiding mechanism 2 includes a first guide rail 201 symmetrically disposed at the top of the frame 1, a limiting block 202 is disposed at an end of the first guide rail 201, a plurality of first sliders 203 fixedly connected to the top of the transfer frame 3 are slidably disposed on the first guide rail 201, and the transfer frame 3 can be driven to slide along the first guide rail 201 through the first sliders 203.

Specifically, the driving mechanism 4 includes a mounting seat 41 symmetrically arranged on the side edge of the top of the transferring frame 3, two sides of the mounting seat 41 are rotatably provided with a transferring driving shaft 42, a gear 43 is arranged at the end part of the transferring driving shaft 42, a rack 44 engaged with the gear 43 for transmission is arranged on the top of the frame 1, a first speed reducer 45 is arranged in the middle of the transferring driving shaft 42, a first motor 46 is arranged on the side edge of the first speed reducer 45, the first motor 46 is started to further drive the transferring driving shaft 42 to rotate, so that the gear 43 at the end part is synchronously rotated to further be engaged with the rack 44 for transmission, and the transferring frame 3 is driven to move along the first guide rail 21.

As shown in fig. 5, specifically, the second guiding and sliding mechanism 5 includes a plurality of second guiding rails 51 provided on the side of the fork lifting frame 6, each second guiding rail 51 is slidably provided with a plurality of second sliding blocks 52 fixedly connected with the transfer frame 3, and the fork lifting frame 6 is lifted in the middle of the transfer frame 3 under the guiding and sliding action of the second sliding blocks 52 and the second guiding rails 51 by controlling the first telescopic cylinder 7.

Specifically, the telescopic assembly comprises a plurality of first oil cylinders 7 arranged at the bottom of the transfer frame 3, and telescopic ends of the first oil cylinders 7 are connected with the top of the fork lifting frame 6.

As shown in fig. 8 and 9, specifically, a scanning mechanism 11 is arranged on one side of a frame 1, the scanning mechanism 11 comprises a mounting column 111 arranged on the side of the frame 1, a driving cavity 112 is formed in one side of the mounting column 111, a driving shaft 12 is symmetrically arranged at the opening of the driving cavity 112, a three guide rail 113 is slidably arranged on the three guide rail 113, a plurality of three sliding blocks 114 are slidably arranged on the three sliding blocks 114, lifting seats 115 are jointly connected with the three sliding blocks, seat rods 116 are symmetrically clamped on one side of the lifting seats 115, air cylinder seats 117 are arranged at the end parts of the seat rods 116 in a clamping manner, gun seats 118 are slidably arranged on one side of the air cylinder seats 117, a telescopic end is arranged on one side of each air cylinder seat 117 and fixedly connected with one air cylinder 119, a code scanning gun 1181 is arranged on one side of each air cylinder seat 118, a driving shaft 12 is rotatably arranged at the top and bottom of each driving cavity 112, a chain wheel 13 is arranged in the middle of each driving shaft 12, the two side of each chain wheel 13 is in transmission connection with a connecting block 14, two driving shafts 12 are fixedly connected with each driving shaft 14 through two driving blocks, two motors 16 are connected with each driving shaft 14, two motors 16 are connected with each driving shaft 12 through two driving shafts 17, two driving shafts 17 are rotatably control shafts and are respectively arranged on two sides of two driving shafts, and a lifting seat shafts are rotatably connected with a lifting assembly through two driving shafts, and a lifting assembly is further, and a lifting assembly is rotatably controlled through a lifting mechanism 1.

As shown in fig. 3 and fig. 4, specifically, the turnover mechanism 9 includes that frame 1 is kept away from move and carry 3 one side bottom and be equipped with fixing base 91, the fixing base 91 middle part is equipped with turnover spindle 92, turnover spindle 92 middle part symmetry is equipped with press plate 93, frame 1 bottom one side symmetry is equipped with mounting panel 94, press plate 93 pass through hydro-cylinder two 95 with mounting panel 94 is connected, turnover spindle 92 symmetry is equipped with turnover plate 96, both sides turnover plate 96 is connected and is equipped with mounting beam 18, turnover plate 96 keeps away from turnover spindle 92 one side is equipped with pressure shaft 19, pressure shaft 19 excircle wall symmetry is equipped with draws seat 20, mounting beam 18 be equipped with the telescopic end with draw seat 20 fixed connection's cylinder two 21, pressure shaft 19 tip is equipped with swing arm 22, both sides swing arm 22 top is equipped with compression roller 23, turnover spindle 92 one end is equipped with speed reducer three 97, through control hydro-cylinder two 95 and cylinder two 21 flexible, and then with the photovoltaic module on the iron support compress tightly to turnover plate 96 to collide with, to overturn plate 96 to carry out the upset, through control three 105, make the photovoltaic module on the side plate 104 flexible flat plate 96 and the processing is not easy to cause the unsmooth assembly to the elegant appearance when the processing.

Specifically, the fixed end of the first oil cylinder 7 is mounted at the bottom of the transfer frame 3, the telescopic end of the first oil cylinder 7 is mounted at the top of the fork lifting frame 6, the fixed end of the second oil cylinder 95 is fixedly connected with the mounting plate 94, and the telescopic end of the second oil cylinder 95 is fixedly connected with the clamping plate 93.

As shown in fig. 7, specifically, the side pushing mechanism 10 includes a side pushing frame 101 disposed on a side of the frame 1 near the turnover mechanism 9, guide cylinders 102 are symmetrically disposed at the top of the side pushing frame 101, guide shafts 103 are slidably disposed in the guide cylinders 102, side pushing plates 104 are jointly connected with one inward end of each of the guide shafts 103, and three cylinders 105 fixedly connected with the side pushing plates 104 are symmetrically disposed on the side pushing frame 101.

Specifically, the side pushing plate 104 is provided with a cushion 24 on an inward side, and the cushion 24 includes, but is not limited to, a PU cushion, so that the cushion 24 is used to prevent the side pushing plate 104 from damaging the photovoltaic module during the leveling process.

Specifically, the bottom of the fork lifting frame 6 is symmetrically provided with balance forks 25, and stability during feeding of the photovoltaic module is ensured by arranging the balance forks 25.

The working principle of the utility model is as follows: before the use, move and carry the one side extreme position that frame 3 was kept away from tilting mechanism 9 in guide rail one 21, hold in the palm fork crane 6 and accomodate to move and carry in frame 3, the turnover plate 96 is located the recess of transfer chain 26, and hydro-cylinder two 95 is in the extension state, when using, through control cylinder one 7 extension, and then drive fork 8 and go up and down, adjust the positional relationship of fork 8 and iron support, rethread starter motor one 46 drives and moves and carry driving shaft 42 rotation, and then drive tip gear 43 and rack 44 meshing transmission, make move and carry frame 3 along guide rail one 21 to iron support one side slip, insert fork 8 to the inside suitable position of iron support, rethread control motor one 46 and hydro-cylinder one 7 transport photovoltaic module to on transfer chain 26, and sweep the sign indicating number registration to photovoltaic module in the transportation, when photovoltaic module is located on the transfer chain 26, through control cylinder two 21 extension, make compression roller 23 press from tightly with photovoltaic module, and control cylinder two shorten and drive turnover plate 96 and the iron support positional relationship, and then through control cylinder three 105 extension, and then make 24 photovoltaic module sides on the side push pedal 104 leveling, when photovoltaic module is convenient for packing the photovoltaic module, after control cylinder two is controlled to be convenient for the photovoltaic module is elongated again, when the photovoltaic module is convenient for the tie up and the tie-up in the period, the photovoltaic module is not affected on the photovoltaic module is packed in the back in the stage of the time of packing.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the utility model.

Claims

1. A material loading lifting machine for photovoltaic module packing, includes frame (1), its characterized in that: the top of the frame (1) is symmetrically provided with a first sliding guide mechanism (2), the first sliding guide mechanism (2) is provided with a moving and carrying frame (3) in a sliding way, one side of the moving and carrying frame (3) is provided with a driving mechanism (4), the inner side wall of the moving and carrying frame (3) is symmetrically provided with a second sliding guide mechanism (5), the second sliding guide mechanism (5) is provided with a fork lifting frame (6) in a sliding way, the bottom of the transfer frame (3) is connected with the top of the fork supporting lifting frame (6) through a telescopic component, a fork (8) is arranged at the bottom of the fork supporting lifting frame (6), the frame (1) is far away from one side of the transfer frame (3) and is provided with a turnover mechanism (9), and side pushing mechanisms (10) are symmetrically arranged on the side edges of the turnover mechanism (9).

2. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the first guide and sliding mechanism (2) comprises a first guide rail (201) symmetrically arranged at the top of the frame (1), limiting blocks (202) are arranged at the end parts of the first guide rail (201), and a plurality of first sliding blocks (203) fixedly connected with the top of the transfer frame (3) are arranged on the first guide rail (201) in a sliding mode.

3. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the driving mechanism (4) comprises mounting seats (41) symmetrically arranged on the side edges of the top of the transfer frame (3), transfer driving shafts (42) are rotatably arranged in the middle of the mounting seats (41) on two sides, gears (43) are arranged at the ends of the transfer driving shafts (42), racks (44) meshed with the gears (43) are arranged on the top of the frame (1), a first speed reducer (45) is arranged in the middle of the transfer driving shafts (42), and a first motor (46) is arranged on the side edge of the first speed reducer (45).

4. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the second guide and sliding mechanism (5) comprises a plurality of second guide rails (51) arranged on the side edges of the fork lifting frame (6), and a plurality of second sliding blocks (52) fixedly connected with the transfer frame (3) are arranged on each second guide rail (51) in a sliding mode.

5. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the telescopic assembly comprises a plurality of oil cylinders (7) arranged at the bottom of the transfer frame (3), and telescopic ends of the oil cylinders (7) are connected with the tops of the fork lifting frames (6).

6. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the utility model discloses a scanning device, including frame (1), frame (1) one side is equipped with scanning mechanism (11), scanning mechanism (11) include erection column (111) that frame (1) side was equipped with, erection column (111) are inwards offered to one side and are driven chamber (112), drive chamber (112) opening part symmetry is equipped with guide rail three (113), slide on guide rail three (113) and be equipped with a plurality of slider three (114), slider three (114) are connected with elevating seat (115) jointly, elevating seat (115) one side symmetry joint is equipped with seat pole (116), seat pole (116) tip joint is equipped with cylinder block (117), cylinder block (117) one side slip is equipped with rifle seat (118), cylinder block (117) one side be equipped with flexible end with cylinder (119) of rifle seat (118) fixed connection, rifle seat (118) one side is equipped with and sweeps a yard rifle (1181), drive chamber (112) top and bottom all rotate and are equipped with drive shaft (12), drive shaft (12) middle part is equipped with sprocket (13), both sides sprocket (13) pass through chain (14) transmission connection, sprocket (13) pass through elevating seat (15) and two link ends (16) are connected with connecting block (16), and a motor II (17) is arranged on the side edge of the speed reducer II (16).

7. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: turnover mechanism (9) are including frame (1) is kept away from move and carry frame (3) one side bottom and be equipped with fixing base (91), fixing base (91) middle part is equipped with upset main shaft (92), upset main shaft (92) middle part symmetry is equipped with clamp bedplate (93), frame (1) bottom one side symmetry is equipped with mounting panel (94), clamp bedplate (93) through hydro-cylinder two (95) with mounting panel (94) are connected, upset main shaft (92) symmetry is equipped with upset board (96), both sides upset board (96) are connected and are equipped with installation roof beam (18), upset board (96) are kept away from upset main shaft (92) one side is equipped with pressure axle (19), pressure axle (19) outer circular wall symmetry is equipped with draws seat (20), installation roof beam (18) be equipped with flexible end with draw seat (20) fixed connection's cylinder two (21), pressure axle (19) tip is equipped with swing arm (22) top connection is equipped with compression roller (23), upset main shaft (92) one end is equipped with speed reducer three (97).

8. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: the side pushing mechanism (10) comprises a side pushing frame (101) arranged on the side edge of the frame (1) close to the turnover mechanism (9), guide cylinders (102) are symmetrically arranged at the top of the side pushing frame (101), guide shafts (103) are arranged in the guide cylinders (102) in a sliding mode, side pushing plates (104) are jointly connected with the inner ends of the guide shafts (103) on two sides, and three air cylinders (105) fixedly connected with the side pushing plates (104) are symmetrically arranged on the side pushing frame (101).

9. The feeding elevator for packaging of photovoltaic modules according to claim 8, wherein: the side pushing plate (104) is provided with a cushion pad (24) on the inward side.

10. The feeding elevator for packaging of photovoltaic modules according to claim 1, wherein: balance forks (25) are symmetrically arranged at the bottom of the fork lifting frame (6).