CN104868139B

CN104868139B - Recovery processing device of waste dry battery

Info

Publication number: CN104868139B
Application number: CN201510216224.0A
Authority: CN
Inventors: 谢洁萍
Original assignee: 谢洁萍
Current assignee: Jiangmen Jianghai full time Battery Co., Ltd.
Priority date: 2015-05-03
Filing date: 2015-05-03
Publication date: 2017-03-22
Anticipated expiration: 2035-05-03
Also published as: CN104868139A

Abstract

The invention discloses a recovery processing device of a waste dry battery. The recovery processing device comprises a support rack, a battery shell broken device, a sorting device, a fixed mould, a rotation shaft, a first motor, a runner, a feeding hopper, a separation device and a transmission device, wherein battery grooves used for accommodating the dry battery are formed at the circumferential edge of the runner, the transmission device comprises a second motor, a shell, a screw rod, a transmission sleeve and a rotation limiting mechanism, the separation device comprises a push rod and a push mould, a first cavity is arranged in the push rod, an air inlet is formed on the side wall of the push rod and communicated with outside pressure air source, a second cavity is arranged in the push mould, a punch die is arranged in the second cavity, a limitation part used for limiting the punch die is arranged on the inner side wall at the bottom of the push mould, and a third cavity for the inner core of the dry battery to pass through is formed on the fixed mould. By the novel recovery processing device, the job of separation of the shell and the inner core of the waste dry battery can be fulfilled better, and the recovery efficiency of the waste dry battery can be significantly improved.

Description

A kind of recycling and processing device of scrap dry battery

Technical field

The invention belongs to old and useless battery reclaims field, and in particular to a kind of recycling and processing device of scrap dry battery.

Background technology

With increasing for electronics technology product category and quantity, the use of battery is more and more extensive, and World Battery yield is just Increased with annual 20% speed.China is battery production state maximum in the world and country of consumption, yearly productive capacity about 150～ 16000000000, all kinds of batteries account for the 1/4 of World Battery volume of production, rank first in the world.But battery is brought just giving people life While sharp, also very big negative effect is brought to living environment.If can be by old and useless battery recycling, the annual whole nation The metals resources such as substantial amounts of ferrum, zinc, manganese, nickel, cobalt can be saved just, is a very huge wealth.Therefore, how to administer " electricity Pollute in pond ", reduce the wasting of resources, increase economic efficiency, farthest avoid environmental pollution, realize old and useless battery resource profit With and harmless treatment, it has also become focus of concern.

At present, usually the shell and inner core of aneroid battery are together crushed, then to crush after batch mixing carry out at concentration Reason, obtains callable resource.However, in this way, it is easily caused between the material in the batch mixing after crushing and occurs respectively Chemical reaction is planted, is caused the waste of recyclable resource, and the efficiency of this processing mode is not also high.

The content of the invention

For the deficiencies in the prior art, the object of the invention is intended to provide a kind of recycling and processing device of scrap dry battery, The mask work of the shell and inner core of scrap dry battery can be preferably completed, the organic efficiency of scrap dry battery is significantly improved.

For achieving the above object, the present invention is adopted the following technical scheme that：

A kind of recycling and processing device of scrap dry battery, including bracing frame, battery case breaking device, sorting unit, peace The stent being mounted on bracing frame, the rotating shaft being installed in rotation on bracing frame, for the first of drive shaft rotary work Motor, in rotating shaft and can be with the runner of rotating shaft synchronous rotary, the feed hopper above runner, for separating dry electricity The segregation apparatuss of pond shell and inner core, the actuating device for driving segregation apparatuss movable, the circumferential edges of the runner Place is formed with the battery case for accommodating aneroid battery, the second motor that the actuating device includes being fixedly mounted on bracing frame, The sheath body being fixedly mounted on the second motor, the screw rod being connected in sheath body and with the output shaft of the second motor and spiral shell The drive sleeve of swing arm threaded connection, the limit rotation mechanism for limiting drive sleeve rotation, the segregation apparatuss include and drive sleeve phase The catch bar of connection, installed in catch bar stem and with stent in the promotion mould that is oppositely arranged, the battery case is along promotion The pushing direction of bar extends, and is provided with the first cavity, is formed with empty with first on the side wall of the catch bar in the catch bar The air inlet that chamber is connected, the air inlet are connected with the pressure gas source in the external world, are formed with empty with first in the promotion mould The second cavity that chamber is connected, is provided with second cavity and mould relative can be promoted to do movable punch die, the promotion It is provided with the bottom inside wall of mould for the limiting section spacing to punch die, in the stent, is formed with the inner core for aneroid battery The 3rd cavity for passing through；

The battery case breaking device include below runner crack case, installed in the driving shaft cracked in case and Driven shaft, the 3rd motor for driving driving shaft to rotate, are provided with first gear on the driving shaft, pacify on the driven shaft Equipped with the second gear being meshed with first gear, the first swivel knife group is installed on the driving shaft, is pacified on the driven shaft Equipped with the second swivel knife group being engaged with the first swivel knife group, the case that cracks is provided with for accepting what is dropped from runner The feedboard of aneroid battery shell, the bottom for cracking case are provided with discharging opening；

The sorting unit includes support, rack-mount separatory vessel, the concentration equipment in separatory vessel, described Charging aperture is formed with the top of separatory vessel, the charging aperture is connected with discharging opening, the bottom of the separatory vessel forms and is magnetic Material outlet, the opposite sides of the separatory vessel are respectively formed with the outlet of the first non-magnetic material and go out with the second non-magnetic material Mouthful, the concentration equipment is included in being arranged side by side and the first transmitting device that conveying direction is contrary and the second transmitting device, described The input of the first transmitting device is located at the underface of charging aperture, and the outfan of first transmitting device can be by non-magnetic material Get rid of to the first non-magnetic material and export, the backhaul turning of the outfan of first transmitting device is installed with roughly selects magnetic Ferrum, the input of second transmitting device can be used to accept the thick Magnetic Materials dropped from the outfan of the first transmitting device Material, the outfan of second transmitting device can get rid of non-magnetic material to the second non-magnetic material and export, second transmission The backhaul turning of the outfan of device is installed with, and the magnetic material outlet is positioned at the second transmitting device The underface of outfan simultaneously can be used to accept the thin magnetic material dropped from the outfan of the second transmitting device.

Preferably, the screw that the limit rotation mechanism includes the fixed cylinder being sleeved in drive sleeve, is inserted in fixed cylinder, institute State and in drive sleeve, be formed with the first guide groove inserted for the end head of screw.

Preferably, the limit rotation mechanism also includes the guide pillar in drive sleeve, is formed with and supplies guide pillar on the sheath body End head inserting the second guide groove.

Preferably, the centrage of the catch bar is alignd with the centrage of punch die, the centrage of promotion mould.

Preferably, the fairlead for being oriented to catch bar is installed on support frame as described above.

Preferably, the feed hopper is provided with baffle plate in the edge of runner.

Preferably, vibrator is installed on the feed hopper.

Preferably, the quantity of the battery case is multiple, and the centrage circumference along runner is arranged.

Preferably, the first swivel knife group includes multiple first rotating blades, per two adjacent the first rotating blades Between the first spacer is installed；The second swivel knife group includes multiple second rotating blades, per two second adjacent rotations Second spacer is installed between blade, in setting is corresponded, described first rotates for first spacer and the second rotating blade Blade and the second spacer are mounted on spacing in the two ends for corresponding setting, the first swivel knife group and the second swivel knife group Nut.

Beneficial effect of the present invention is：

By the setting of said structure, scrap dry battery falls into the battery case of runner from feed hopper the present invention, connects Rotating wheel, scrap dry battery is rotated to stent and the position between mould is promoted, then by actuator drives point From device being located proximate to towards scrap dry battery, after stent and promotion mould are to scrap dry battery positioning, by extraneous pressure Strength source drives punch die to pass through scrap dry battery so that the inner core of scrap dry battery is passed from the 3rd cavity, and waste and old dry electricity The shell in pond due to the effect of gravity, is voluntarily fallen on feedboard downwards under the continuation rotation of runner, is finally entered to broken Cracked in solution case, after completing to crack, by sorting unit, can be by the magnetic material of the battery case after cracking and non magnetic material Sorted, so as to preferably complete the separation of the shell and inner core of old and useless battery, therefore, the present invention can preferably complete waste and old The mask work of the shell and inner core of aneroid battery, significantly improves the organic efficiency of scrap dry battery；Meanwhile, the centrage of catch bar Centrage with punch die, promote the centrage of mould to align, be so designed that, scrap dry battery can be facilitated before separating treatment is done Positioning work, can also improve impact dynamics of the punch die to scrap dry battery.

Description of the drawings

Fig. 1 is the structural representation of the present invention；

Schematic side views of the Fig. 2 for Fig. 1；

Fig. 3 is the decomposition texture schematic diagram of the actuating device of the present invention；

Fig. 4 is the structural representation of the battery case breaking device and sorting unit of the present invention；

Fig. 5 is the internal structure schematic diagram of the battery case breaking device of the present invention；

Fig. 6 is the aneroid battery fill process schematic diagram of the present invention；

Fig. 7 is that the segregation apparatuss of the present invention carry out shell and the detached process schematic of inner core to aneroid battery.

Wherein, 1, bracing frame；2nd, the first motor；3rd, actuating device；300th, the second motor；301st, screw rod；302nd, it is fixed Cylinder；303rd, drive sleeve；304th, guide pillar；305th, sheath body；306th, the second guide groove；307th, the first guide groove；308th, screw；4th, rotating shaft；5、 Runner；6th, stent；7th, promote mould；8th, fairlead；9th, catch bar；10th, feed hopper；11st, vibrator；12nd, aneroid battery；13rd, keep off Plate；14th, battery case；15th, the 3rd cavity；16th, punch die；17th, limiting section；18th, the second cavity；19th, air inlet；20th, pressure gas source； 21st, the first cavity；22nd, the 3rd motor；23rd, crack case；24th, feedboard；25th, stop nut；26th, driving shaft；261st, the first tooth Wheel；262nd, the first rotating blade；263rd, the first spacer；27th, driven shaft；271st, second gear；272nd, the second rotating blade；273、 Second spacer；28th, discharging opening；29th, separatory vessel；30th, charging aperture；31st, the first transmitting device；32nd, the second transmitting device；33rd, it is thick Select Magnet；34th, carefully select Magnet；35th, the second non-magnetic material outlet；36th, the first non-magnetic material outlet；37th, magnetic material goes out Mouthful；38th, support.

Specific embodiment

Below, with reference to accompanying drawing and specific embodiment, the present invention is described further：

As shown in figs. 1-7, be the present invention a kind of scrap dry battery recycling and processing device, including bracing frame 1, battery outside Shell breaking device, sorting unit, the stent 6 on bracing frame 1, the rotating shaft 4 being installed in rotation on bracing frame 1, For the first motor 2 of 4 rotary work of drive shaft, in rotating shaft 4 and can with the runner 5 of 4 synchronous rotary of rotating shaft, install In the feed hopper 10 above runner 5, the segregation apparatuss for separating 12 shell of aneroid battery and inner core, before for driving segregation apparatuss The actuating device 3 for moving afterwards, is formed with the battery case 14 for accommodating aneroid battery 12 at the circumferential edges of the runner 5, described Actuating device 3 includes the second motor 300 being fixedly mounted on bracing frame 1, the sheath body being fixedly mounted on the second motor 300 305th, the screw rod 301 that is connected in sheath body 305 and with the output shaft of the second motor 300, it is threadedly coupled with screw rod 301 Drive sleeve 303, the limit rotation mechanism for limiting the rotation of drive sleeve 303, the segregation apparatuss include being connected with drive sleeve 303 Catch bar 9, installed in 9 stem of catch bar and with stent 6 in the promotion mould 7 that is oppositely arranged, the battery case 14 is along pushing away The pushing direction of lever 9 extends, and is provided with the first cavity 21 in the catch bar 9, be formed with the side wall of the catch bar 9 with The air inlet 19 that first cavity 21 is connected, the air inlet 19 are connected with the pressure gas source 20 in the external world, in the promotion mould 7 The second cavity 18 being connected with the first cavity 21 is formed with, is provided with second cavity 18 before mould 7 relative being promoted to do The punch die 16 for moving afterwards, is provided with for the limiting section 17 spacing to punch die 16 on the bottom inside wall for promoting mould 7, described The 3rd cavity 15 passed through for the inner core of aneroid battery 12 is formed with stent 6；

The battery case breaking device include below runner 5 crack case 23, installed in the master cracked in case 23 Moving axis 26 and driven shaft 27, the 3rd motor 22 for driving driving shaft 26 to rotate, are provided with the first tooth on the driving shaft 26 Wheel 261, is provided with the second gear 271 being meshed with first gear 261 on the driven shaft 27, install on the driving shaft 26 There is the first swivel knife group, the second swivel knife group being engaged with the first swivel knife group is installed on the driven shaft 27, it is described broken Solution case 23 is provided with the feedboard 24 for accepting 12 shell of aneroid battery dropped from runner 5, the bottom for cracking case 23 It is provided with discharging opening 28；

The sorting unit includes support 38, installs separatory vessel 29 on the bracket 38, the magnetic separation in separatory vessel 29 Device, the top of the separatory vessel 29 are formed with charging aperture 30, and the charging aperture 30 is connected with discharging opening 28, the separatory vessel 29 bottom is formed with magnetic material outlet 37, and the opposite sides of the separatory vessel 29 is respectively formed with the first non-magnetic material and goes out Mouth 36 and the second non-magnetic material outlet 35, the concentration equipment are included in the first transmission being arranged side by side and conveying direction is contrary Device 31 and the second transmitting device 32, the input of first transmitting device 31 are located at the underface of charging aperture 30, and described the The outfan of one transmitting device 31 can get rid of non-magnetic material to the first non-magnetic material outlet 36, first transmitting device 31 The backhaul turning of outfan be installed with and roughly select Magnet 33, the input of second transmitting device 32 can be used to accept The thick magnetic material dropped from the outfan of the first transmitting device 31, the outfan of second transmitting device 32 can be by non-magnetic Property material get rid of to the second non-magnetic material outlet 35, the fixed installation of the backhaul turning of the outfan of second transmitting device 32 Having, and the magnetic material outlet 37 is located at the underface of the outfan of the second transmitting device 32 and can be used to accept The thin magnetic material dropped from the outfan of the second transmitting device 32.

The scrap dry battery 12 of the present embodiment is fallen in battery case 14 from feed hopper 10, then starts the first motor 2, The rotation of rotating shaft 4, and then the rotation of drive runner 5 is driven, when battery case 14 is located at stent 6 and promotes the position between mould 7 When, close the first motor 2.Then, start the second motor 300, drive drive sleeve 303 movement, and then drive catch bar 9 towards Move near the direction of scrap dry battery 12, in the presence of mould 7 and stent 6 is promoted, complete determining to scrap dry battery 12 Position work.Then, the switch of extraneous pressure gas source 20 is opened, in the presence of pressure gas source 20, brings huge to punch die 16 Impulsive force so that the inner core of scrap dry battery 12 is gone out from inside the shell, is finally passed from the 3rd cavity 15.Then, close The switch of pressure gas source 20, punch die 16 start to reset, and then invert the second motor 300 so that promote mould 7 away from waste and old dry The direction movement of the shell of battery 12, then starts the first motor 2, drives the shell rotation of scrap dry battery 12, outside finally Under the action of gravity of shell, shell is fallen on feedboard 24 downwards from battery case 14, and finally entering to cracking is carried out in case 23 Crack.After completing to crack, by sorting unit, the magnetic material and non magnetic material of 12 shell of aneroid battery after can cracking are carried out point Choosing.

The present invention actuating device 3 drive catch bar 9 operation principle be：The rotation of the second motor 300 can drive spiral The rotation of bar 301, due to drive sleeve 303 and 301 bolt of screw rod, and in the presence of limit rotation mechanism, so drive pass The linear motion of dynamic set 303, so as to drive catch bar 9 away from or move near the direction of scrap dry battery 12.

The operation principle of battery case breaking device of the present invention is：3rd motor 22 drives the rotation of driving shaft 26, enters And the rotation of drive first gear 261 and the first swivel knife group, so as to drive second gear 271, driven shaft 27 and the second rotation The rotary work of rotor group, cracks under effect to enter 12 shell of aneroid battery in the rotation of the first swivel knife group and the second swivel knife group Row is cracked.

The grading principle of sorting unit of the present invention is：Drop from discharging opening 28 crack after 12 shell of aneroid battery from Enter at charging aperture 30, then fall on the first transmitting device 31, output is delivered to from the input of the first transmitting device 31 End, at the backhaul turning of the first transmitting device 31, non-magnetic material and roughly selects no magnetic attraction between Magnet 33, first Got rid of under the motional inertia of transmitting device 31 deliver to the first non-magnetic material outlet 36 at, magnetic material due to roughly select magnetic Have magnetic attraction between ferrum 33, thus thick magnetic material can be delivered to from the upper surface of the outfan of the first transmitting device 31 it is defeated Go out the lower surface at end, as Magnet 33 is roughly selected at the backhaul turning for there was only the first transmitting device 31, so thick magnetic material is also It is to fall on the input of the second transmitting device 32；Then in the presence of the second transmitting device 32, from the second transmission dress The input for putting 32 is delivered to outfan, carries out thin magnetic separation, and in last thick magnetic material, the less material of magnetic is transported to the At two non-magnetic materials outlet 35, and the thin magnetic material of relatively high magnetism is finally transported at magnetic material outlet 37.This The first bright transmitting device 31 and the second transmitting device 32 can be the defeated devices of crawler belt of the prior art, by what is arranged thereon Material preferably can be carried out lateral transport by crawler belt.

Preferably, the limit rotation mechanism includes the fixed cylinder 302 being sleeved in drive sleeve 303, is inserted in fixed cylinder 302 Screw 308, be formed with the drive sleeve 303 for screw 308 end head insert the first guide groove 307.

Preferably, the limit rotation mechanism also includes the guide pillar 304 in drive sleeve 303, is formed on the sheath body 305 There is the second guide groove 306 inserted for the end head of guide pillar 304.

In the presence of above-mentioned limit rotation mechanism, the rotary work of drive sleeve 303 can be effectively prevented so which can only do directly Line is moved.

Preferably, the centrage of the catch bar 9 is alignd with the centrage of punch die 16, the centrage of promotion mould 7.So set Meter, can facilitate positioning work of the scrap dry battery 12 before separating treatment is done, can also improve punch die 16 to scrap dry battery 12 Impact dynamics.

Preferably, the fairlead 8 for being oriented to catch bar 9 is installed on support frame as described above 1.

Preferably, the feed hopper 10 is provided with baffle plate 13 in the edge of runner 5.In the presence of baffle plate 13, can have Effect prevents scrap dry battery 12 from sliding from battery case 14.

Preferably, vibrator 11 is installed on the feed hopper 10.The vibration of vibrator 11 can effectively prevent waste and old dry electricity There is the phenomenon of blocking when pond 12 is fallen into battery case 14.

Preferably, the quantity of the battery case 14 is multiple, and the centrage circumference along runner 5 is arranged.

Preferably, the first swivel knife group includes multiple first rotating blades 262, per two adjacent the first swivel knife First spacer 263 is installed between piece 262；The second swivel knife group includes multiple second rotating blades 272, per adjacent two Second spacer 273 is installed between individual second rotating blade 272, first spacer 263 and the second rotating blade 272 are in one by one It is correspondingly arranged, first rotating blade 262 and the second spacer 273 are arranged in corresponding, the first swivel knife group and the The two ends of two swivel knife groups are mounted on stop nut 25.First rotating blade 262 and the second rotating blade 272 are rotated in high speed When, high speed shear can be carried out to 12 shell of aneroid battery, while the cutting edge of the first rotating blade 262 and the second spacer 273, the second rotation Mutually shearing, tear and the effect for extruding is formed between the cutting edge of rotor piece 272 and the first spacer 263, so as to reach what is cracked Purpose.

For a person skilled in the art, technical scheme that can be as described above and design, make other each Plant corresponding change and deform, and all these changes and deforms the protection model that should all belong to the claims in the present invention Within enclosing.

Claims

1. a kind of recycling and processing device of scrap dry battery, it is characterised in that：Including bracing frame, battery case breaking device, divide Screening device, the stent on bracing frame, the rotating shaft being installed in rotation on bracing frame, for drive shaft rotate work Make the first motor, in rotating shaft and can with the runner of rotating shaft synchronous rotary, the feed hopper above runner, be used for Segregation apparatuss, the actuating device for driving segregation apparatuss movable of aneroid battery shell and inner core is separated, the runner The battery case for accommodating aneroid battery is formed with circumferential edges, and the actuating device includes be fixedly mounted on bracing frame Two motors, the sheath body being fixedly mounted on the second motor, the spiral being connected in sheath body and with the output shaft of the second motor The drive sleeve that bar is threadedly coupled with screw rod, the limit rotation mechanism for limiting drive sleeve rotation, the segregation apparatuss include and biography It is dynamic cover be connected catch bar, installed in catch bar stem and with stent in the promotion mould that is oppositely arranged, the battery case edge Catch bar pushing direction extend, be provided with the first cavity in the catch bar, be formed with the side wall of the catch bar with The air inlet that first cavity is connected, the air inlet with the external world pressure gas source be connected, it is described promotion mould in be formed with The second cavity that first cavity is connected, is provided with second cavity and mould relative can be promoted to do movable punch die, institute State and be provided with for the limiting section spacing to punch die on the bottom inside wall for promote mould, be formed with the stent and supply aneroid battery The 3rd cavity that passes through of inner core；

The battery case breaking device include below runner crack case, installed in the driving shaft cracked in case and driven Axle, the 3rd motor for driving driving shaft to rotate, are provided with first gear, are provided with the driven shaft on the driving shaft The second gear being meshed with first gear, is provided with the first swivel knife group, is provided with the driven shaft on the driving shaft The second swivel knife group being engaged with the first swivel knife group, the case that cracks are provided with for accepting the dry electricity dropped from runner The feedboard of pond shell, the bottom for cracking case are provided with discharging opening；

The sorting unit includes support, rack-mount separatory vessel, the concentration equipment in separatory vessel, the sorting Charging aperture is formed with the top of case, and the charging aperture is connected with discharging opening, and the bottom of the separatory vessel is formed with magnetic material Outlet, the opposite sides of the separatory vessel are respectively formed with the outlet of the first non-magnetic material and the outlet of the second non-magnetic material, institute Stating concentration equipment includes that described first passes in being arranged side by side and the first transmitting device that conveying direction is contrary and the second transmitting device The input of defeated device is located at the underface of charging aperture, and the outfan of first transmitting device can get rid of non-magnetic material to the One non-magnetic material is exported, and the backhaul turning of the outfan of first transmitting device is installed with roughly selects Magnet, described The input of the second transmitting device can be used to accepting the thick magnetic material that drops from the outfan of the first transmitting device, and described the The outfan of two transmitting devices can get rid of non-magnetic material to the second non-magnetic material and export, the output of second transmitting device The backhaul turning at end is installed with, and the magnetic material outlet is just being located at the outfan of the second transmitting device Lower section simultaneously can be used to accept the thin magnetic material dropped from the outfan of the second transmitting device.

2. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：The limit rotation mechanism includes set The fixed cylinder being mounted in drive sleeve, the screw being inserted in fixed cylinder, are formed with the drive sleeve slotting for the end head of screw First guide groove of dress.

3. the recycling and processing device of scrap dry battery as claimed in claim 2, it is characterised in that：The limit rotation mechanism also includes Guide pillar in drive sleeve, is formed with the second guide groove inserted for the end head of guide pillar on the sheath body.

4. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：The centrage of the catch bar Centrage, the centrage of promotion mould with punch die aligns.

5. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：It is provided with support frame as described above For the fairlead being oriented to catch bar.

6. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：The feed hopper is in runner Edge is provided with baffle plate.

7. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：It is provided with the feed hopper Vibrator.

8. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：The quantity of the battery case is Multiple, the centrage circumference along runner is arranged.

9. the recycling and processing device of scrap dry battery as claimed in claim 1, it is characterised in that：The first swivel knife group bag Multiple first rotating blades are included, the first spacer is installed between every two adjacent the first rotating blades；Second swivel knife Group includes multiple second rotating blades, is often provided with the second spacer between two adjacent the second rotating blades, described first every Set is in correspond to arrange with the second rotating blade, and first rotating blade and the second spacer are in setting is corresponded, described The two ends of the first swivel knife group and the second swivel knife group are mounted on stop nut.