CN210994701U - Casting waste sand regeneration and recovery system capable of automatically discharging - Google Patents

Abstract

The utility model relates to a waste sand retrieves technical field, specifically is a but automatic discharge's casting waste sand regeneration recovery system for can not carry out automatic discharge to broken material among the solution prior art, thereby reduced work efficiency's problem. The utility model discloses a feed bin, negative pressure breaker and whirlwind formula expansion bin, whirlwind formula expansion bin and negative pressure breaker's bottom surface all is equipped with automatic discharge device, automatic discharge device is including installing the closing plate at negative pressure breaker discharge gate lower extreme or whirlwind formula expansion bin discharge gate lower extreme, closing plate fixedly connected with discharge bar, install the weight that can follow discharge bar axial displacement on the discharge bar, the discharge bar is articulated through first hinge with negative pressure breaker discharge gate or whirlwind formula expansion bin discharge gate. The utility model discloses well material can come out from whirlwind formula inflation storehouse and negative pressure breaker in automatically to can carry out automatic discharge to broken material, and then improve the work efficiency of this system.

Description

Casting waste sand regeneration and recovery system capable of automatically discharging

Technical Field

The utility model relates to a broken technical field of material, more specifically relate to a but waste foundry sand regeneration recovery system of automatic discharge.

Background

The processing of minerals usually needs to process larger materials into smaller particles for effective utilization, and waste sand after casting application is subjected to casting high temperature to form blocks with higher strength. Efficient crushers are required to break apart the lumps, separating out sand particles, which can also be used in the casting process, or to make sodium silicate.

The regeneration and recovery system for the casting waste sand in the prior art comprises a vibrating screen, a belt conveyor, a crusher and a hopper, wherein a vibrating screen I is arranged below a discharge port of a collecting hopper, a discharge port of the vibrating screen corresponds to a feed port of the crusher, a vibrating screen II is arranged below a discharge port of the crusher, a discharge port of the vibrating screen II corresponds to the belt conveyor, and a discharge port of the belt conveyor corresponds to a feed port of a sand washer. The system organically combines devices for crushing, deironing, cleaning and the like of the waste foundry sand, and extracts the foundry sand and sodium silicate in the waste foundry sand.

However, some devices in the above system for recycling foundry waste sand cannot automatically discharge the crushed materials when the materials are crushed, thereby reducing the working efficiency of the system. Therefore, a casting waste sand recycling system which can automatically discharge and improve the working efficiency is urgently needed.

SUMMERY OF THE UTILITY MODEL

Based on above problem, the utility model provides a but automatic discharge's foundry waste sand regeneration recovery system for can not carry out automatic discharge to broken material among the solution prior art, thereby reduced the work efficiency's of this system problem. The utility model discloses in all be equipped with automatic discharge device in whirlwind formula expansion bin and negative pressure breaker's bottom surface, when the material in whirlwind formula expansion bin and the negative pressure breaker reaches certain volume, the material can come out in whirlwind formula expansion bin and the negative pressure breaker automatically to can carry out automatic discharge to broken material, and then improve the work efficiency of this system.

The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme:

the utility model provides a but casting sand reclamation system of automatic discharge, includes the feed bin, the feed bin is connected with the negative pressure breaker through transition mechanism, the negative pressure breaker is connected with whirlwind formula expansion bin, the bottom surface of whirlwind formula expansion bin and negative pressure breaker all is equipped with automatic discharge apparatus, automatic discharge apparatus is including installing the closing plate at the discharge gate lower extreme of negative pressure breaker or the discharge gate lower extreme of whirlwind formula expansion bin, closing plate fixedly connected with discharge bar, install the weight that can follow discharge bar axial displacement on the discharge bar, the discharge bar is articulated through first hinge with the discharge gate of negative pressure breaker or the discharge gate of whirlwind formula expansion bin.

The working principle is as follows: when the automatic material discharging device works, materials enter the bin and enter the transition mechanism from the bin, the materials enter the negative pressure crusher from the transition mechanism, the negative pressure crusher crushes the materials, smaller materials enter the automatic material discharging device at the bottom of the negative pressure crusher, larger materials enter the cyclone expansion bin through the discharge port of the negative pressure crusher, the cyclone expansion bin separates qualified materials after secondary crushing from dust, the qualified materials enter the automatic material discharging device at the bottom of the cyclone expansion bin, when the weight of the materials in the discharge port of the negative pressure crusher or the discharge port of the cyclone expansion bin is greater than the balance weight of the heavy hammer, the automatic material discharging device automatically opens the sealing plate, the materials fall onto the main belt conveyor, when the weight of the materials in the discharge port of the negative pressure crusher or the discharge port of the cyclone expansion bin is less than the balance weight, the heavy hammer is automatically closed, thus the lever principle is utilized, the sealing performance of the system is guaranteed, and the material can be automatically discharged, so that the working efficiency of the system is improved.

As a preferable mode, the discharging rod is a screw rod, a thread is arranged in the heavy hammer, and the screw rod is connected with the heavy hammer through the thread.

As an optimal mode, transition mechanism is including installing the jaw crusher in the feed bin below, jigging conveyer is installed to jaw crusher's below, be equipped with the screen cloth in the jigging conveyer, main band conveyer is installed to the below of screen cloth, main band conveyer's end-to-end connection has discharging equipment, jigging conveyer still is connected with inferior band conveyer, negative pressure breaker is connected with inferior band conveyer, automatic discharge device establishes the top at main band conveyer.

As a preferable mode, the discharging device is a grading vibration sieve, the grading vibration sieve is divided into a plurality of layers, and each layer corresponds to one discharging opening.

As a preferable mode, a first dust hood is arranged above the grading vibration screen, an air outlet is arranged above the cyclone expansion bin, and the first dust hood and the air outlet are both connected with the same bag-type dust collector through dust collection pipes.

As a preferred mode, the upper portion of feed bin is equipped with shaped steel, all set up strong magnet on the bottom of jigging conveyer and the side, jigging conveyer's upper portion is equipped with the second suction hood.

As a preferred mode, the negative pressure breaker includes the barrel, the top surface of barrel is equipped with the feed inlet, and the bottom surface is equipped with out the tap, the top surface of barrel is installed and is extended to the pivot in the barrel, power device is installed to the upper end of pivot, there is the tup through second hinge connection along its direction of height in the pivot, install the support on the inner wall of barrel, install the inner tube on the support, leave the cavity between inner tube and barrel, it has a plurality of gas pockets to open on the inner tube, open the lower part of barrel have with the communicating air outlet of cavity, install updraft ventilator on the air outlet.

As a preferable mode, the inner cylinder is composed of a plurality of lining plate assemblies, the lining plate assemblies are mounted on the support through bolts, and the air holes are uniformly formed in the lining plate assemblies.

Preferably, the lining plate component is trapezoidal, the width of the upper part of the lining plate component is larger than that of the lower part of the lining plate component, the inner cylinder is conical, and the cross-sectional area of the upper part of the inner cylinder is larger than that of the lower part of the inner cylinder.

The utility model has the advantages as follows:

(1) the utility model discloses in all be equipped with automatic discharge device in whirlwind formula expansion bin and negative pressure breaker's bottom surface, when the material in whirlwind formula expansion bin and the negative pressure breaker reaches certain volume, the material can come out in whirlwind formula expansion bin and the negative pressure breaker automatically to can carry out automatic discharge to broken material, and then improve the work efficiency of this system.

(2) The utility model discloses well discharge arm is the screw rod, is equipped with the screw thread in the weight, and the screw rod passes through threaded connection with the weight, when the equilibrium volume of weight is set up to needs, can with the weight along the rotatory distance that changes between weight and the hinge of screw rod can, it is comparatively convenient to operate, and the screw thread has auto-lock nature, can make the weight can not be random slide on the screw rod.

(3) The utility model discloses in be equipped with the screen cloth in the jigging conveyer, whirlwind formula inflation storehouse and negative pressure breaker's bottom surface all are equipped with automatic discharge device, and the cubic material and the thin material that will break after can be timely separately to can reduce the work load of the broken casting sand of this system, improve work efficiency.

(4) The utility model discloses the top of well hierarchical shale shaker is equipped with first suction hood, and the top in whirlwind formula inflation storehouse is equipped with the air outlet, and first suction hood and air outlet all are connected with same sack cleaner through the dust absorption union coupling. Dust in the cyclone expansion bin and the grading vibration screen enters the bag-type dust collector through the dust collection pipe, so that the pollution of the dust to the environment and the influence on the health of workers can be reduced.

(5) The section steel is arranged at the upper part of the middle storage bin, the section steel has a gap, and materials can fall off from the gap, so that the section steel can prevent overlarge materials from entering the jaw crusher; strong magnets are arranged on the bottom and the side faces of the vibrating conveyor, and can absorb iron impurities in the materials and can be cleaned manually at regular intervals; the upper portion of jigging conveyer is equipped with the second suction hood, and the dust in the jigging conveyer can be siphoned away to the second suction hood to the dust polluted environment in the jigging conveyer can be reduced.

(6) The small sand grains separated by the middle negative pressure crusher are taken away along with wind in time, so that the obstruction of the sand grains is reduced, massive materials are directly hit, the probability and the strength of hitting the massive materials are increased, and the efficiency of crushing the materials is improved; after the large materials are beaten, the separated small sand grains are timely taken away by wind, so that the small sand grains are prevented from being repeatedly beaten and excessively crushed, and the product percent of pass is improved; the dust is sucked away by wind in time and is emptied after dust removal, thereby reducing the environmental pollution.

(7) The utility model discloses well discharging equipment is hierarchical shale shaker, and hierarchical shale shaker is the multilayer, and every layer all corresponds a discharge gate, and the material after finally being broken like this can be classified according to the size of difference and go out from the discharge gate.

(8) The utility model discloses well welt subassembly is trapezoidal, and the width on welt subassembly upper portion is greater than the width of lower part, and the inner tube is the toper, and the upper portion cross-sectional area of inner tube is greater than the lower part cross-sectional area. Big end down on the inner tube, the clearance between down inner tube wall and the tup progressively reduces, has increased the time that the material exists in the barrel to increased and beaten the probability of beating, and then improved the efficiency broken to the material.

Drawings

FIG. 1 is a schematic view of the front structure of the present invention;

FIG. 2 is a schematic view of the front structure of the automatic discharging device of the present invention;

FIG. 3 is a schematic view of the front cross-sectional structure of the negative pressure crusher of the present invention;

FIG. 4 is a schematic view of the top view of the negative pressure crusher of the present invention;

FIG. 5 is a schematic view of the front structure of the lining board assembly installed on the cylinder body;

FIG. 6 is a schematic view of the top view of the liner plate assembly of the present invention mounted on the barrel;

FIG. 7 is a simplified front view of the liner plate assembly of the present invention;

reference numerals: 1 bin, 101 profile steel, 2 jaw crushers, 3 vibrating conveyors, 301 second dust hoods, 302 strong magnets, 303 screens, 4 times of belt conveyors, 5 main belt conveyors, 6 negative-pressure crushers, 61 cylinders, 601 air outlets, 602 feed inlets, 603 discharge nozzles, 62 internal cylinders, 63 hammerheads, 64 second hinge shafts, 65 rotating shafts, 66 power devices, 67 cavities, 68 supports, 69 bolts, 610 lining plate components, 611 air holes, 7 automatic discharge devices, 71 hammers, 72 discharge rods, 73 first hinge shafts, 74 closed plates, 8 cyclone expansion bins, 9 bag-type dust collectors, 10 grading vibrating screens, 11 first dust hoods, 12 discharge ports and 13 dust collection pipes.

Detailed Description

For a better understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and the following embodiments.

Example 1:

as shown in fig. 1 and 2, a casting waste sand recycling system capable of automatically discharging materials comprises a material bin 1, the material bin 1 is connected with a negative pressure crusher 6 through a transition mechanism, a discharge port of the negative pressure crusher 6 is connected with a cyclone expansion bin 8, the bottom surfaces of the cyclone expansion bin 8 and the negative pressure crusher 6 are respectively provided with an automatic discharging device 7, the automatic discharging device 7 comprises a closing plate 74 installed at the lower end of the discharge port of the negative pressure crusher 6 or the lower end of the discharge port of the cyclone expansion bin 8, the closing plate 74 is fixedly connected with a discharging rod 72, a heavy hammer 71 capable of axially moving along the discharging rod 72 is installed on the discharging rod 72, and the discharging rod 72 is hinged with the discharge port of the negative pressure crusher 6 or the discharge port of the cyclone expansion bin 8 through a first hinge shaft 73.

The working principle is as follows: when the automatic material discharging device works, materials enter the stock bin 1 and enter the transition mechanism from the stock bin 1, the materials enter the negative pressure crusher 6 from the transition mechanism, the negative pressure crusher 6 crushes the materials, smaller materials enter the automatic material discharging device 7 at the bottom of the negative pressure crusher 6, larger materials enter the cyclone expansion bin 8 through the other material outlet of the negative pressure crusher 6, the cyclone expansion bin 8 separates qualified materials after secondary crushing from dust, the qualified materials enter the automatic material discharging device 7 at the bottom of the cyclone expansion bin 8, when the weight of the materials in the material outlet of the negative pressure crusher 6 or the material outlet of the cyclone expansion bin 8 is larger than the balance of 71, the automatic material discharging device 7 automatically opens the sealing plate, the materials fall onto the main belt conveyor 5, when the weight of the materials in the material outlet of the negative pressure crusher 6 or the material outlet of the cyclone expansion bin 8 is smaller than the balance of the heavy hammer 71, the closing plate is automatically closed, so that the lever principle is utilized, the closure of the system is ensured, and the automatic discharging can be realized, so that the working efficiency of the system is improved.

Preferably, the discharging rod 72 is a screw rod, a thread is arranged in the weight 71, the screw rod is connected with the weight 71 through the thread, when the balance of the weight 71 needs to be set, the weight 71 can be rotated along the screw rod to change the distance between the weight 71 and the hinge shaft, the operation is convenient, the thread has self-locking performance, and the weight 71 can not slide on the screw rod randomly.

Example 2:

as shown in fig. 1, on the basis of the above embodiment, this embodiment provides a specific preferable mode of the system. The transition mechanism is including installing jaw crusher 2 in feed bin 1 below promptly, and jigging conveyer 3 is installed to jaw crusher 2's below, is equipped with screen cloth 303 in the jigging conveyer 3, and main band conveyer 5 is installed to screen cloth 303's below, and main band conveyer 5's end-to-end connection has discharging equipment, and jigging conveyer 3 still is connected with inferior band conveyer 4, and negative pressure breaker 6 is connected with inferior band conveyer 4, and automatic discharge device 7 establishes in main band conveyer 5's top.

When the material crusher works, materials enter the material bin 1, enter the jaw crusher 2 from the material bin 1, are subjected to primary crushing in the jaw crusher 2, the materials subjected to primary crushing enter the vibrating conveyor 3, are separated through the screen 303 in the vibrating conveyor 3, smaller materials reach the main belt conveyor 5 through the screen 303, larger materials are conveyed into the negative pressure crusher 6 through the secondary belt conveyor 4, the materials subjected to primary crushing are subjected to secondary crushing in the negative pressure crusher 6, the materials subjected to crushing in the negative pressure crusher 6 reach the main belt conveyor 5 through the automatic discharging device 7, the smaller materials reach the main belt conveyor 5 through the automatic discharging device 7, the larger materials enter the cyclone expansion bin 8 through the discharge port of the negative pressure crusher 6, the cyclone expansion bin 8 separates qualified materials subjected to secondary crushing from dust, and the qualified materials reach the main belt conveyor 5 through the automatic discharging device 7, all material entering the main belt conveyor 5 finally enters the discharge device.

Preferably, discharging equipment is hierarchical shale shaker 10, and hierarchical shale shaker 10 is current equipment, and hierarchical shale shaker 10 divides into the multilayer, and every layer all corresponds a discharge gate, and the material after finally being broken can be classified according to the size of difference like this and go out from the discharge gate.

Preferably, a first dust hood 11 is arranged above the grading vibration screen 10, an air outlet 601 is arranged above the cyclone expansion bin 8, and the first dust hood 11 and the air outlet 601 are both connected with the same bag-type dust collector 9 through a dust collection pipe 13. Dust in the cyclone expansion bin 8 and the grading vibration screen 10 enters the bag-type dust collector 9 through the dust collection pipe 13, so that the pollution of the dust to the environment and the influence on the health of workers can be reduced.

Preferably, the section steel 101 is arranged at the upper part of the silo 1, the section steel 101 is provided with a gap, and materials can fall from the gap, so that the section steel 101 can prevent overlarge materials from entering the jaw crusher 2; strong magnets 302 are arranged at the bottom and on the side surface of the vibrating conveyor 3, and the strong magnets 302 can absorb iron impurities in the material and can be cleaned manually at regular intervals; the upper portion of the vibrating conveyor 3 is provided with a second dust collection cover 301, the second dust collection cover 301 can collect dust in the vibrating conveyor 3, so that the dust pollution in the vibrating conveyor 3 can be reduced, and the installation of the section steel 101, the strong magnet 302 and the second dust collection cover 301 by the skilled person in the art is known, so that the detailed description is omitted here.

The rest is the same as example 1, and therefore, will not be described herein.

Example 3:

as shown in fig. 2 to 7, this embodiment gives a preferable structure of the negative pressure crusher based on embodiments 1 and 2. That is, the negative pressure crusher 6 includes a barrel 61, a feed inlet 602 is provided on the top surface of the barrel 61, a discharge nozzle 603 is provided on the bottom surface, a rotating shaft 65 extending into the barrel 61 is installed on the top surface of the barrel 61, a power device 66 is installed on the upper end of the rotating shaft 65, a hammer 63 is connected to the rotating shaft 65 along the height direction thereof through a second hinge shaft 64, a bracket 68 is installed on the inner wall of the barrel 61, an inner barrel 62 is installed on the bracket 68, a cavity 67 is left between the inner barrel 62 and the barrel 61, a plurality of air holes 611 are opened on the inner barrel 62, an air outlet 601 communicating with the cavity 67 is opened on the lower portion of the barrel 61, and an air draft.

The power device 66 drives the rotating shaft 65 to rotate, a mounting block capable of mounting the second hinge shaft 64 can be mounted on the rotating shaft 65, or the mounting block capable of mounting the second hinge shaft 64 and the rotating shaft 65 are integrally formed, the rotating shaft 65 drives the hammer 63 to rotate, the power device 66 driving the rotating shaft 65 to rotate is a conventional power device 66, such as a motor and the like, when a material falls down from the feeding port 602 and enters the barrel 61, the material is struck and crushed by the hammer 63 rotating at a high speed, the struck material collides with the lining plate component 610 and is crushed, the struck material collides with the hammer 63 after counterattack, and hard impurities are discharged from a discharge port below after multiple times of striking. The air outlet 601 is externally connected with an air extracting device, wherein the air extracting device can be a fan or a waste sand treatment system, a wind power system which is set for protecting the environment exists originally, namely the wind power system can be arranged in the whole system, negative pressure is formed in the cavity 67 by the air extracting device, wind from inside to outside is formed under the action of the negative pressure, the wind enters the barrel body 61 from the feeding hole 602 and the discharging hole, small particles are taken away, and the wind penetrates through the air hole 611 on the lining plate component 610 and enters the cavity 67 to be finally discharged from the air outlet 601. The small sand grains separated by the negative pressure crusher 6 are taken away with wind in time, so that the obstruction of the sand grains is reduced, large materials are directly beaten, the probability and the strength of beating the large materials are increased, and the efficiency of crushing the materials is improved; after the large materials are beaten, the separated small sand grains are timely taken away by wind, so that the small sand grains are prevented from being repeatedly beaten and excessively crushed, and the product percent of pass is improved; the dust is sucked away by wind in time and is emptied after dust removal, thereby reducing the environmental pollution.

Preferably, the inner cylinder 62 is composed of a plurality of liner plate assemblies 610, the liner plate assemblies 610 are mounted on the bracket 68 through bolts 69, a plurality of air holes 611 are uniformly formed on the liner plate assemblies 610, the liner plate assemblies 610 are trapezoidal, the width of the upper part of the liner plate assemblies 610 is larger than that of the lower part, the inner cylinder 62 is tapered, and the cross-sectional area of the upper part of the inner cylinder 62 is larger than that of the lower part. The inner tube 62 is big-end-up, and the clearance between the inner tube 62 wall and the tup 63 down reduces gradually, has increased the time that the material exists in barrel 61 to increased the probability of being hit by the beating, and then improved the efficiency broken to the material.

The rest is the same as example 1, and therefore, will not be described herein.

The embodiment of the present invention is the above. The specific parameters in the above embodiments and examples are only for the purpose of clearly showing the verification process of the present invention, and are not used to limit the protection scope of the present invention, which is still subject to the claims, and all the equivalent structural changes made by using the contents of the specification and drawings of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a but casting sand reclamation recovery system of automatic discharge which characterized in that: including feed bin (1), feed bin (1) is connected with negative pressure crusher (6) through transition mechanism, negative pressure crusher (6) are connected with cyclone expansion bin (8), the bottom surface of cyclone expansion bin (8) and negative pressure crusher (6) all is equipped with automatic discharge device (7), automatic discharge device (7) are including installing at discharge gate lower extreme of negative pressure crusher (6) or the closing plate (74) of the discharge gate lower extreme of cyclone expansion bin (8), closing plate (74) fixedly connected with discharge bar (72), install weight (71) that can follow discharge bar (72) axial displacement on discharge bar (72), discharge bar (72) are articulated through first hinge (73) with the discharge gate of negative pressure crusher (6) or the discharge gate of cyclone expansion bin (8).

2. The foundry waste sand recycling system capable of automatically discharging according to claim 1, which is characterized in that: the discharging rod (72) is a screw rod, a thread is arranged in the heavy hammer (71), and the screw rod is connected with the heavy hammer (71) through the thread.

3. The foundry waste sand recycling system capable of automatically discharging according to claim 1, which is characterized in that: transition mechanism is including installing jaw breaker (2) in feed bin (1) below, jigging conveyer (3) are installed to the below of jaw breaker (2), be equipped with screen cloth (303) in jigging conveyer (3), main band conveyer (5) are installed to the below of screen cloth (303), the end-to-end connection of main band conveyer (5) has discharging equipment, jigging conveyer (3) still are connected with inferior band conveyer (4), negative pressure breaker (6) are connected with inferior band conveyer (4), the top at main band conveyer (5) is established in automatic discharge device (7).

4. The foundry waste sand recycling system capable of automatically discharging according to claim 3, which is characterized in that: the discharging equipment is a grading vibrating screen (10), the grading vibrating screen (10) is divided into a plurality of layers, and each layer corresponds to one discharging opening (12).

5. The foundry waste sand recycling system capable of automatically discharging according to claim 4, which is characterized in that: the dust collector is characterized in that a first dust collection cover (11) is arranged above the grading vibrating screen (10), an air outlet (601) is arranged above the cyclone expansion bin (8), and the first dust collection cover (11) and the air outlet (601) are both connected with the same bag-type dust collector (9) through a dust collection pipe (13).

6. The foundry waste sand recycling system capable of automatically discharging according to any one of claims 3 to 5, wherein: the upper portion of feed bin (1) is equipped with shaped steel (101), strong magnet (302) have all been put to the bottom and the side of jigging conveyer (3), the upper portion of jigging conveyer (3) is equipped with second suction hood (301).

7. The foundry waste sand recycling system capable of automatically discharging according to claim 1, which is characterized in that: negative pressure breaker (6) are including barrel (61), the top surface of barrel (61) is equipped with feed inlet (602), and the bottom surface is equipped with ejection of compact mouth (603), pivot (65) that extend to in barrel (61) are installed to the top surface of barrel (61), power device (66) are installed to the upper end of pivot (65), be connected with tup (63) through second hinge (64) along its direction of height on pivot (65), install support (68) on the inner wall of barrel (61), install inner tube (62) on support (68), leave cavity (67) between inner tube (62) and barrel (61), it has a plurality of gas pockets (611) to open on inner tube (62), the lower part of barrel (61) is opened has with communicating air outlet (601) of cavity (67), install updraft ventilator on air outlet (601).

8. The foundry waste sand recycling system capable of automatically discharging according to claim 7, characterized in that: the inner cylinder (62) is composed of a plurality of lining plate components (610), the lining plate components (610) are installed on the support (68) through bolts (69), and the air holes (611) are uniformly formed in the lining plate components (610).

9. The foundry waste sand recycling system capable of automatically discharging according to claim 8, characterized in that: the liner plate component (610) is trapezoidal, the width of the upper part of the liner plate component (610) is larger than that of the lower part, the inner cylinder (62) is conical, and the cross sectional area of the upper part of the inner cylinder (62) is larger than that of the lower part.

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