CN216659981U - Smelting furnace is conveyer for scrap iron ladle - Google Patents

Abstract

The utility model discloses a transfer device for a smelting furnace scrap iron ladle, which relates to the field of industrial production and comprises a chassis, a driving motor and a first limiting sleeve, wherein the top of the chassis is provided with a guide part and an automatic limiting part, the automatic limiting part comprises a first groove arranged on the surface of the chassis, and the first groove consists of an inverted circular truncated cone component and two semi-waist-shaped components which are symmetrical about the axis of the inverted circular truncated cone component. An object of this application provides a smelting furnace is conveyer for scrap iron ladle, through the one side of setting up spherical bulge of rubber pad to the scrap iron ladle guide with spacing, make the scrap iron ladle remove to with the backup pad is coaxial, avoid conveyer's focus to take place the skew, realize spacing the automation of scrap iron ladle through the automatic spacing part of dead weight cooperation of scrap iron ladle, labour saving and time saving has improved the conveying efficiency of scrap iron ladle.

Description

Smelting furnace iron ladle scrap is with transfer device

Technical Field

The utility model relates to the field of industrial production, in particular to a transfer device for a waste ladle of a smelting furnace.

Background

The foundry ladle is a pouring device of a casting device, is used for pouring operation in a casting workshop, receives molten iron in front of a furnace, and then conveys the molten iron to a casting mold for pouring by a travelling crane, and the waste foundry ladle needs to be transported after the foundry ladle is damaged.

For example, publication number CN214825431U discloses a smelting furnace is transfer device for scrap iron ladle, including backup pad, connecting rod two, gyro wheel two and connecting rod four, six telescopic links and damping spring of bottom lateral wall fixed connection of backup pad, telescopic link and damping spring fixed connection connecting rod two and connecting rod four, two gyro wheels two are all rotated and connected at the both ends of connecting rod two and connecting rod four, two second rotation motors of lateral wall fixed connection of the gyro wheel two at the both ends of connecting rod two, two connecting rods three of fixed connection between connecting rod two and the connecting rod four. This application utilizes backup pad and two bracing pieces to share the gravity of iron scrap water drum jointly on the bracing piece through the couple with the gravity sharing of iron scrap water drum, makes things convenient for the transportation of iron scrap water drum, and the clamp is tight iron scrap water drum through the fixation clamp in this application, and in-process iron scrap water drum takes place to empty when preventing to transport, utilizes damping spring, slows down vibrations, avoids iron scrap water drum secondary damage.

Foretell smelting furnace is conveyer for iron ladle scrap adopts the mode that the tight iron ladle of hydraulic stem drive fixation clamp tight, need extra power take off to adjust the hydraulic stem, waste time and energy, the conveying efficiency of iron ladle scrap is reduced, the thrust capacity of backup pad is limited simultaneously, in case exceed the thrust load of backup pad, can lead to the backup pad to buckle, and then influence the spacing stability of iron ladle, can take place the iron ladle even and empty, influence transfer personnel's life safety, therefore, this application provides a smelting furnace is conveyer for iron ladle scrap satisfies the demand.

SUMMERY OF THE UTILITY MODEL

An object of the application provides a smelting furnace is conveyer for scrap iron ladle, the scrap iron ladle pushes down the backup pad under the effect of self gravity, through the second stop collar, the second pivot drives the motion of arc-shaped supporting shoe, the arc-shaped supporting shoe makes the arc stopper remove under the restriction of third pivot, the outside contact of rubber pad and scrap iron ladle is passed through to the arc stopper, and guide and spacing to the scrap iron ladle through the one side that the rubber pad set up spherical bulge, make the scrap iron ladle remove to with the same axle center of backup pad, avoid conveyer's focus to take place the skew, automatic spacing to the scrap iron ladle is realized to dead weight cooperation automatic spacing part spare through the scrap iron ladle, time saving and labor saving, the conveying efficiency of scrap iron ladle has been improved.

In order to achieve the above purpose, the present application provides the following technical solutions: a transfer device for a smelting furnace scrap ladle comprises a base plate, a driving motor and a first limiting sleeve, wherein a guide part and an automatic limiting part are mounted at the top of the base plate;

the automatic limiting part comprises a first groove arranged on the surface of the chassis, the first groove consists of an inverted circular truncated cone component and two semi-waist-shaped components which are symmetrical about the axis of the inverted circular truncated cone component, the bottom of the first groove is fixedly connected with a spring, a supporting plate is fixedly arranged at the top end of the spring, the supporting plate consists of the inverted circular truncated cone component and two semi-waist-shaped components which are symmetrical about the axis of the inverted circular truncated cone component, the top of the supporting plate is flush with the top of the chassis, second limiting sleeves are arranged at the tops of the two semi-waist-shaped components of the supporting plate, a second rotating shaft is sleeved in the inner ring rotating manner of the second limiting sleeve, an arc-shaped supporting block is fixedly sleeved on the outer ring of the second rotating shaft, an arc-shaped limiting block is fixedly arranged at one end, far away from the second rotating shaft, of the arc-shaped supporting block is fixedly arranged with a rubber pad, the side, away from the arc-shaped limiting block, of the rubber pad is provided with a plurality of spherical protrusions, the rubber pad is attached to the inner arc surface of the arc-shaped limiting block, the arc-shaped supporting block consists of an arc-shaped component and a ring component arranged on the protrusion side of the arc-shaped component, a third rotating shaft is rotatably sleeved in the ring component, two groups of second supporting sleeves are symmetrically arranged on the top of the chassis relative to the axis of the first groove, each group of second supporting sleeves comprises two second supporting sleeves, the second supporting sleeves are fixedly sleeved with the third rotating shaft, and the second supporting sleeves are located on the protrusion side of the arc-shaped supporting block;

the guide component is used for guiding the scrap iron ladle to the automatic limiting component, and the automatic limiting component is used for automatically limiting the scrap iron ladle.

The guide part comprises a first rotating shaft connected with the output end of the driving motor in a keyed mode, a bobbin is fixedly sleeved on the outer ring of the middle of the first rotating shaft, a plurality of limiting grooves are formed in the outer ring of the bobbin, a rope body is wound in each limiting groove, a hook is fixedly mounted at the tail end of the rope body, the first limiting sleeve is a waist-shaped ring, the first limiting sleeve is located on two sides of the first limiting sleeve, first supporting rods are fixedly mounted on two sides of the first limiting sleeve, the rope body penetrates through the first limiting sleeve and is located right above the first groove, and the hook is located at the bottom of the first limiting sleeve.

The top of the chassis is fixedly provided with two first fixing pipes, the two first fixing pipes are symmetrical about the axis of the first groove, the middle of the top of each first fixing pipe is fixedly provided with a first supporting pipe, the top of each first supporting pipe is fixedly provided with a first supporting sleeve, and the first supporting sleeves are rotationally sleeved with the first rotating shafts.

The equal fixed mounting in both sides of first stay tube has the second stay tube, the second stay tube is kept away from the one end of first stay tube with the both ends top fixed connection of first fixed pipe, first fixed pipe first stay tube with the second stay tube is square pipe.

The equal fixed mounting in both sides of first fixed pipe has first L type backup pad, the right angle department of first L type backup pad is provided with a plurality of strengthening ribs, first L type backup pad with first stay tube fixed connection.

One side fixed mounting of first stay tube has second L type backup pad, second L type backup pad with driving motor fixed connection.

The chassis is a sheet metal part, a plurality of reinforcing ribs are arranged at the bottom of the chassis, roller assemblies are fixedly mounted at four corners of the bottom of the chassis, and the bottom ends of the roller assemblies are lower than the bottom of the chassis. .

In conclusion, the technical effects and advantages of the utility model are as follows:

1. the automatic limiting device is reasonable in structure, the waste ladle presses the supporting plate under the action of self gravity, the arc-shaped supporting block is driven to move through the second limiting sleeve and the second rotating shaft, the arc-shaped limiting block is driven to move under the limitation of the third rotating shaft by the arc-shaped supporting block, the arc-shaped limiting block is contacted with the outer side of the waste ladle through the rubber pad, and the waste ladle is guided and limited through one side of the rubber pad provided with the spherical bulge, so that the waste ladle is moved to be coaxial with the supporting plate, the deviation of the gravity center of the transfer device is avoided, the automatic limiting of the waste ladle is realized through the self-weight of the waste ladle matched with the automatic limiting component, the time and labor are saved, and the transportation efficiency of the waste ladle is improved;

2. according to the waste ladle fixing device, the first rotating shaft and the bobbin are supported through the first supporting sleeve, the supporting strength of the first rotating shaft and the bobbin is improved through the design of the square pipe, meanwhile, compared with the supporting plate, the supporting strength is higher due to the structural design of the square pipe, the waste ladle can be effectively supported, the supporting strength of the first supporting pipe is further enhanced through the strength support provided for the periphery of the first supporting pipe through the second supporting pipe and the first L-shaped supporting plate, the hook is matched with the hook hung on the top hanging rod of the waste ladle, the waste ladle is sufficiently and effectively fixed, and the life safety of transfer personnel is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

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

FIG. 2 is a schematic perspective view of a first perspective of the present invention;

FIG. 3 is an enlarged perspective view of the guide assembly;

fig. 4 is a schematic perspective enlarged structure view of the automatic limiting component.

In the figure: 1. a chassis; 2. a first stationary tube; 3. a first support tube; 4. a second support tube; 5. a first L-shaped support plate; 6. a second L-shaped support plate; 7. a drive motor; 8. a first rotating shaft; 9. a bobbin; 10. hooking; 11. a first support sleeve; 12. a first support bar; 13. a first stop collar; 14. a first groove; 15. a second support sleeve; 16. a spring; 17. a support plate; 18. a second stop collar; 19. a second rotating shaft; 20. an arc-shaped supporting block; 21. an arc-shaped limiting block; 22. a rubber pad; 23. a third rotating shaft; 24. a roller assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Example (b): referring to fig. 1-4, the transferring device for the waste ladle of the smelting furnace comprises a chassis 1, a driving motor 7 and a first limiting sleeve 13, wherein a guide part and an automatic limiting part are arranged at the top of the chassis 1;

the automatic limiting part comprises a first groove 14 arranged on the surface of the chassis 1, the first groove 14 consists of an inverted circular truncated cone component and two semi-waist-shaped components which are symmetrical about the axis of the inverted circular truncated cone component, the bottom of the first groove 14 is fixedly connected with a spring 16, the spring 16 provides buffer for a waste ladle placed at the top of a supporting plate 17 to prevent the supporting plate 17 from colliding with the first groove 14 and further being damaged, the top end of the spring 16 is fixedly provided with the supporting plate 17, the supporting plate 17 consists of the inverted circular truncated cone component and the two semi-waist-shaped components which are symmetrical about the axis of the inverted circular truncated cone component, the top of the supporting plate 17 is flush with the top of the chassis 1, the tops of the two semi-waist-shaped components of the supporting plate 17 are both provided with a second limiting sleeve 18, the inner ring of the second limiting sleeve 18 is rotatably sleeved with a second rotating shaft 19, the outer ring of the second rotating shaft 19 is fixedly sleeved with an arc-shaped supporting block 20, one end, far away from the second rotating shaft 19, of the arc-shaped supporting block 20 is fixedly installed with an arc-shaped limiting block 21, a rubber pad 22 is fixedly arranged at one end of the arc-shaped limiting block 21 far away from the arc-shaped supporting block 20, the arc-shaped limiting block 21 can be prevented from colliding with a waste ladle in the moving process of the transferring device through the rubber pad 22, so that secondary damage of the waste ladle in the transferring process is avoided, a plurality of spherical protrusions are arranged at one side of the rubber pad 22 far away from the arc-shaped limiting block 21, the friction coefficient of the rubber pad 22 is increased through the spherical protrusions, the stability of the waste ladle in the transferring process is improved, the rubber pad 22 is attached to the inner arc surface of the arc-shaped limiting block 21, the arc-shaped supporting block 20 is composed of an arc-shaped component and a ring component arranged at the protrusion side of the arc-shaped component, a third rotating shaft 23 is sleeved on the inner part of the ring component in a rotating mode, two groups of second supporting sleeves 15 are symmetrically arranged at the top of the chassis 1 relative to the axis of the first groove 14, and each group of second supporting sleeves 15 comprises two second supporting sleeves 15, the second supporting sleeve 15 is fixedly sleeved with the third rotating shaft 23, and the second supporting sleeve 15 is positioned on the convex side of the arc-shaped supporting block 20;

the guide component is used for guiding the waste ladle to the automatic limiting component, and the automatic limiting component is used for automatically limiting the waste ladle;

after the guide part guides the waste ladle to the top of the support plate 17, the waste ladle presses the support plate 17 under the action of self gravity, the support plate 17 presses the spring 16 downwards, meanwhile, the second limiting sleeve 18 and the second rotating shaft 19 drive the arc-shaped supporting block 20 to move, the arc-shaped supporting block 20 enables the arc-shaped limiting block 21 to move under the limitation of the third rotating shaft 23, the arc-shaped limiting block 21 is in contact with the outer side of the waste ladle through the rubber pad 22, the side, provided with the spherical bulge, of the rubber pad 22 guides and limits the waste ladle, the waste ladle and the support plate 17 are coaxial, the deviation of the gravity center of the transfer device is avoided, the waste ladle is automatically limited by matching the self weight of the waste ladle with the automatic limiting part, time and labor are saved, and the transportation efficiency of the waste ladle is improved.

In this embodiment, the guiding component includes a first rotating shaft 8 which is keyed with the output end of the driving motor 7, a bobbin 9 is fixedly sleeved on the outer ring of the middle part of the first rotating shaft 8, a plurality of limiting grooves are formed in the outer ring of the bobbin 9, rope bodies are wound in the limiting grooves, a hook 10 is fixedly installed at the tail end of each rope body, a first limiting sleeve 13 is a waist-shaped ring, first supporting rods 12 are fixedly installed on two sides, located on the first limiting sleeve 13, of the first limiting sleeve 13, the rope bodies penetrate through the first limiting sleeve 13 and are located right above a first groove 14, and the hook 10 is located at the bottom of the first limiting sleeve 13;

when the scrap iron ladle needs to be transported, after the hook 10 is hooked with the hanging rod at the top of the scrap iron ladle, the driving motor 7 is started, the driving motor 7 drives the bobbin 9 to rotate to recover the rope body, the rope body pulls the scrap iron ladle to the top of the chassis 1 through the hook 10, the hook 10 pulls the scrap iron ladle to the top of the chassis 1 through the limiting of the first limiting sleeve 13, the driving motor 7 which continuously works can enable the hook 10 to hang the scrap iron ladle right above the first groove 14 at the moment, then the driving motor 7 is reversely rotated, the scrap iron ladle is placed at the top of the supporting plate 17, the automatic limiting part can conveniently limit the scrap iron ladle, and the transporting efficiency of the scrap iron ladle is further improved.

In this embodiment, two first fixing tubes 2 are fixedly mounted on the top of the chassis 1, the two first fixing tubes 2 are symmetrical with respect to the axis of the first groove 14, a first supporting tube 3 is fixedly mounted in the middle of the top of each first fixing tube 2, a first supporting sleeve 11 is fixedly mounted on the top of each first supporting tube 3, the first supporting sleeve 11 is rotatably sleeved with the first rotating shaft 8, the first rotating shaft 8 is supported by the first supporting sleeve 11, the weight of the scrap iron ladle is prevented from being directly transmitted to the driving motor 7 through the first rotating shaft 8, so that the driving motor 7 is damaged, second supporting tubes 4 are fixedly mounted on both sides of each first supporting tube 3, one ends of the second supporting tubes 4 far away from the first supporting tubes 3 are fixedly connected with the tops of both ends of the first fixing tubes 2, the first supporting tubes 3 and the second supporting tubes 4 are square tubes, first L-shaped supporting plates 5 are fixedly mounted on both sides of the first fixing tubes 2, the right angle of the first L-shaped support plate 5 is provided with a plurality of reinforcing ribs, the support strength of the first L-shaped support plate 5 is improved by arranging the reinforcing ribs, and the first L-shaped support plate 5 is fixedly connected with the first support pipe 3;

first support tube 3 supports first pivot 8 and bobbin 9 through first supporting sleeve 11, the support intensity to first pivot 8 and bobbin 9 has been improved through square tub of design, make transfer device more can effectually provide the support to the iron scrap water drum, and support the intensity that provides all around of first support tube 3 through second stay tube 4 and first L type backup pad 5, the support intensity of first support tube 3 has further been strengthened, the couple 10 that the cooperation articulated with iron scrap water drum top peg, make the iron scrap water drum obtain abundant effectual fixed, transfer personnel's life safety has been ensured.

In this embodiment, a second L-shaped supporting plate 6 is fixedly mounted on one side of the first supporting tube 3, the second L-shaped supporting plate 6 is fixedly connected with the driving motor 7, and the driving motor 7 is supported by the second L-shaped supporting plate 6.

In this embodiment, chassis 1 is the sheet metal component, and chassis 1's bottom is provided with a plurality of strengthening ribs, has improved chassis 1's support intensity, and the equal fixed mounting in bottom four corners of chassis 1 has wheel components 24, and wheel components 24's bottom is less than chassis 1's bottom, improves chassis 1's mobility through wheel components 24, and the staff of being convenient for removes the scrap iron ladle, and wheel components 24 is from taking brake function simultaneously, and the staff of being convenient for fixes chassis 1.

This practical theory of operation:

when the scrap iron ladle needs to be transported, after the hook 10 is hooked with a hanging rod at the top of the scrap iron ladle, the driving motor 7 is started, the driving motor 7 drives the bobbin 9 to rotate to recover the rope body, the rope body pulls the scrap iron ladle to the top of the chassis 1 through the hook 10, the hook 10 pulls the scrap iron ladle to the top of the chassis 1 through the limiting of the first limiting sleeve 13, at the moment, the driving motor 7 which continuously works can enable the hook 10 to hang the scrap iron ladle right above the first groove 14, then the driving motor 7 is reversed, the scrap iron ladle is placed at the top of the supporting plate 17, an automatic limiting part can limit the scrap iron ladle conveniently, and the transporting efficiency of the scrap iron ladle is further improved;

after the waste ladle is guided to the top of the supporting plate 17 by the guide component, the waste ladle presses the supporting plate 17 under the action of self gravity, the supporting plate 17 presses the spring 16 downwards, meanwhile, the arc-shaped supporting block 20 is driven to move through the second limiting sleeve 18 and the second rotating shaft 19, the arc-shaped supporting block 20 enables the arc-shaped limiting block 21 to move under the limitation of the third rotating shaft 23, the arc-shaped limiting block 21 is contacted with the outer side of the waste ladle through the rubber pad 22, the waste ladle is guided and limited through one side of the rubber pad 22 provided with the spherical bulge, the waste ladle and the supporting plate 17 are coaxial, the deviation of the gravity center of the transfer device is avoided, the automatic limitation of the waste ladle is realized through the self weight of the waste ladle matching with the automatic limiting component, time and labor are saved, and the transportation efficiency of the waste ladle is improved;

first stay tube 3 supports first pivot 8 and bobbin 9 through first support sleeve 11, the design has improved the support intensity to first pivot 8 and bobbin 9 through square pipe, make transfer device more can effectually provide the support to the scrap iron package, and support the intensity that provides all around of first stay tube 3 through second stay tube 4 and first L type backup pad 5, the support intensity of first stay tube 3 has further been strengthened, the couple 10 that the cooperation and scrap iron package top peg articulated, make the scrap iron package obtain abundant effectual fixed, the life safety of transfer personnel has been ensured.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims (7)

1. The utility model provides a smelting furnace is conveyer for useless ladle, includes chassis (1), driving motor (7) and first stop collar (13), its characterized in that: the top of the chassis (1) is provided with a guide part and an automatic limiting part;

the automatic limiting part comprises a first groove (14) formed in the surface of the chassis (1), the first groove (14) is composed of an inverted circular truncated cone component and two semi-waist-shaped components symmetrical about the axis of the inverted circular truncated cone component, a spring (16) is fixedly connected to the bottom of the first groove (14), a supporting plate (17) is fixedly mounted at the top end of the spring (16), the supporting plate (17) is composed of the inverted circular truncated cone component and two semi-waist-shaped components symmetrical about the axis of the inverted circular truncated cone component, the top of the supporting plate (17) is flush with the top of the chassis (1), second limiting sleeves (18) are arranged at the tops of the two semi-waist-shaped components of the supporting plate (17), second rotating shafts (19) are sleeved in a rotating mode, arc-shaped supporting blocks (20) are fixedly sleeved on the outer rings of the second rotating shafts (19), an arc limiting block (21) is fixedly installed at one end, far away from the second rotating shaft (19), of the arc-shaped supporting block (20), a rubber pad (22) is fixedly installed at one end, far away from the arc-shaped supporting block (20), of the arc-shaped limiting block (21), a plurality of spherical protrusions are arranged on one side, far away from the arc-shaped limiting block (21), of the rubber pad (22), the inner arc surface of the arc-shaped limiting block is attached to the rubber pad (22), the arc-shaped supporting block (20) is composed of an arc-shaped component and a ring component arranged on the protrusion side of the arc-shaped component, a third rotating shaft (23) is sleeved in the ring component in a rotating mode, two groups of second supporting sleeves (15) are symmetrically installed on the top of the chassis (1) relative to the axis of the first groove (14), each group of second supporting sleeves (15) comprises two second supporting sleeves (15), and the second supporting sleeves (15) are fixedly sleeved with the third rotating shaft (23), the second support sleeve (15) is positioned on the convex side of the arc-shaped support block (20);

the guide component is used for guiding the scrap iron ladle to the automatic limiting component, and the automatic limiting component is used for automatically limiting the scrap iron ladle.

2. The transfer apparatus for the scrap iron pack of the smelting furnace according to claim 1, wherein: the guide part includes, with first pivot (8) of driving motor (7) output end key-on, the fixed bobbin (9) that has cup jointed in the middle part outer lane of first pivot (8), a plurality of spacing grooves have been seted up to the outer lane of bobbin (9), the spacing inslot all around has the rope body, the terminal fixed mounting of the rope body has couple (10), first stop collar (13) are waist type ring, first stop collar (13) are located the equal fixed mounting in both sides of first stop collar (13) has first bracing piece (12), the rope body passes first stop collar (13) are located directly over first recess (14), couple (10) are located the bottom of first stop collar (13).

3. The transfer apparatus for the scrap iron pack of the smelting furnace according to claim 2, wherein: the top fixed mounting on chassis (1) has two first fixed pipes (2), two first fixed pipe (2) about the axle center symmetry of first recess (14), the equal fixed mounting in top middle part of first fixed pipe (2) has first supporting tube (3), the top fixed mounting of first supporting tube (3) has first supporting sleeve (11), first supporting sleeve (11) with first pivot (8) are rotated and are cup jointed.

4. The transfer apparatus for the scrap iron pack of the smelting furnace according to claim 3, wherein: the equal fixed mounting in both sides of first stay tube (3) has second stay tube (4), second stay tube (4) are kept away from the one end of first stay tube (3) with the both ends top fixed connection of first fixed pipe (2), first fixed pipe (2) first stay tube (3) with second stay tube (4) are square pipe.

5. The transfer device for the scrap iron pack of a smelting furnace according to claim 4, wherein: the equal fixed mounting in both sides of first fixed pipe (2) has first L type backup pad (5), the right angle department of first L type backup pad (5) is provided with a plurality of strengthening ribs, first L type backup pad (5) with first stay tube (3) fixed connection.

6. The transfer apparatus for the scrap iron pack of the smelting furnace according to claim 5, wherein: one side fixed mounting of first stay tube (3) has second L type backup pad (6), second L type backup pad (6) with driving motor (7) fixed connection.

7. The transfer apparatus for the scrap iron pack of the smelting furnace according to claim 1, wherein: the base plate (1) is a sheet metal part, a plurality of reinforcing ribs are arranged at the bottom of the base plate (1), roller assemblies (24) are fixedly mounted at four corners of the bottom of the base plate (1), and the bottom ends of the roller assemblies (24) are lower than the bottom of the base plate (1).

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