CN209548728U - Polycarboxylate water-reducer powder production drying device - Google Patents

Abstract

The utility model provides a kind of polycarboxylate water-reducer powder production drying device, it is related to water-reducing agent dry technology, aim to solve the problem that existing water-reducing agent drying device is difficult to the problem of diminishing agent solution is completely dried into powder, it includes hothouse, hothouse side is equipped with hot-air channel and liquor inlet, far from hothouse one end connection hot wind machine occurs for hot-air channel, feed liquid spray head is equipped at liquor inlet, hothouse lower inside is equipped with discharge port, inner upper is equipped with every powder device, hot-air channel and liquor inlet are set between powder device and discharge port, in being externally provided with air outlet every powder device on hothouse side wall, interlayer space is equipped in the side wall of hothouse, steam inlet duct is equipped on the outside of hothouse, steam inlet duct is connected with interlayer space, interlayer space lateral wall is equipped with steam gas outlet.The utility model have ensure that feed liquid is dried to the beneficial effect of pulverulence completely.

Description

Polycarboxylate water-reducer powder production drying device

Technical field

The utility model relates to water-reducing agent dry technologies, fill more particularly, to a kind of polycarboxylate water-reducer powder production is dry It sets.

Background technique

Polycarboxylate water-reducer is one kind of water-reducing agent, refers to and reduces under concrete workability and cement consumption permanence condition Mixing water amount improves concrete strength, or under workability and intensity permanence condition, saves the additive of cement consumption.But The characteristics of due to process route, polycarboxylate water-reducer have the shortcomings that obvious, and being exactly all is the supply of material of 22% aqueous solution in the market, long It is very high apart from transportation cost, cannot for fields such as dry powder and mortars in requisition for powder, the reason of causing this situation to occur be by Relatively small in the molecular weight of polycarboxylate water-reducer, the softening point of powder is low after drying, and processing temperature is higher than softening point for a long time When, the side reactions such as sub- amidation may occur for the reactive group that will lead to the water-reducing agent, cause product appearance to turn yellow, while right The decline of concrete dispersibility.

To solve the above problems, notification number is that CN205198994U utility model discloses a kind of production of water-reducing agent with spraying Drying device comprising air blower, heat source, air distributor, spray head, hothouse, product pump, cyclone separator, air-introduced machine, water Film dust-remover and discharge tank, the air blower are connect with heat source, and the heat source is connect by hot air pipe with air distributor, described Product pump is connect by material delivery pipe with spray head.When in use, air enters at the top of hothouse the utility model by heating Air distributor, hot-air uniformly enters in hothouse in the shape of a spiral, and feed liquid passes through spray head atomization and is sent into hothouse With hot air and drying is powdery granule.

Prior art among the above has the following deficiencies: since the hot-air after heat source heats is entering hothouse After a part of heat can be lost, there may be difficult to for feed liquid to be completely dried when the hot wind and feed liquid that enter hothouse contact after Situation, and the device of continuous heating is not provided in hothouse, therefore, it is difficult to ensure that feed liquid can be completely by heated-air drying at powder Last particle, and then be difficult to be efficiently separated in cyclone separator.

Utility model content

The purpose of the utility model is to provide a kind of polycarboxylate water-reducer powder production drying device, can to feed liquid into It heats effectively to ensure that feed liquid is dried to the beneficial effect of pulverulence completely row many places.

The above-mentioned purpose of utility model of the utility model has the technical scheme that

A kind of polycarboxylate water-reducer powder production drying device, including hothouse, the hothouse side are logical equipped with hot wind Road and liquor inlet, the hot-air channel occur machine far from described hothouse one end connection hot wind, are equipped at the liquor inlet Feed liquid spray head, the hothouse lower inside is equipped with discharge port, inner upper is equipped with every powder device, the hot-air channel and described Liquor inlet between powder device and the discharge port, is externally provided in described every powder device set on described on the hothouse side wall Air outlet is equipped with interlayer space in the side wall of the hothouse, is equipped with steam inlet duct on the outside of the hothouse, the steam into Tracheae is connected with the interlayer space, and the interlayer space lateral wall is equipped with steam gas outlet.

By using above-mentioned technical proposal, the hot wind that hot wind occurs to send out in machine is transferred in hothouse through hot-air channel, The feed liquid of liquid ejects from feed liquid spray head through liquor inlet and forms fine and closely woven misty feed liquid simultaneously, and this feed liquid is in hot wind It acts on lower rapid evaporation to fall moisture and stay in solid solute (water-reducing agent powder) in hothouse, water-reducing agent powder gradually tires out Product is finally flowed out from discharge port.The setting that hot steam is passed through into the interlayer space of hothouse can be avoided into hothouse Feed liquid only have little time under the action of hot wind evaporation caused by water-reducing agent powder extraction effect it is poor, every powder device to prevent Powdered water-reducing agent is taken out of by hot wind from air outlet.The setting can make to keep higher temperature in hothouse, to have It can continue to evaporate conducive to the feed liquid guaranteed into hothouse, to guarantee the aridity of the water-reducing agent powder extracted.

The utility model is further arranged to: the liquor inlet is connected with the hot-air channel, the hot-air channel Collapsible tube, trunnion and enlarged tube including successively drop-over, the liquor inlet are set at the trunnion, are connected outside the liquor inlet Liquid pipe is tapped into, the inlet tube other end is connected with feed liquid cylinder, is connected with liquid pump on the inlet tube.

By using above-mentioned technical proposal, hot wind enters from collapsible tube one end, and passes sequentially through collapsible tube, trunnion and expansion It manages and enters in hothouse, when hot wind enters in trunnion from collapsible tube, since the diameter at trunnion is less than collapsible tube inlet Diameter, when hot wind is flowed into trunnion from collapsible tube, flow velocity is gradually accelerated, and when at trunnion, the flow velocity of hot wind reaches maximum, into Liquid pipe extracts feed liquid by liquid pump from feed liquid cylinder, and feed liquid is sprayed by spray head from trunnion, and hot wind flow velocity herein compared with Height, therefore the feed liquid of spray head ejection can be hit and make its atomization to improve the evaporation rate of moisture in feed liquid.

The utility model is further arranged to: it is described every powder device include filter bag, on the filter bag end closure setting, lower end Opening setting, the interior lower section of the hothouse is equipped with orifice plate, top is equipped with frame plate, offers depositing dust hole, the filter on the orifice plate Bag upper end is fixedly connected on the frame plate upper and lower end peripheral wall and is fixedly connected with depositing dust hole peripheral wall, the hot-air channel into Mouth is set to the hothouse and is located on the side wall below the orifice plate, and the air outlet is set to the hothouse and is located at the orifice plate On side wall between the frame plate.

By using above-mentioned technical proposal, the water-reducing agent powder and vapor carried secretly from the hot wind that hot-air channel comes out into After entering in hothouse, part water-reducing agent powder falls downward and be sunken to hothouse bottom, other water-reducing agent powder is with warm The top of wind direction hothouse is flowed, and due to blocking in hothouse equipped with orifice plate, hot wind is merely able to enter filter by depositing dust hole Bag, and flowed out from filter bag, it is discharged outside hothouse through air outlet, in the process, as hot wind subtracts to what hothouse top was flowed Aqua powder can be adhered on the inside of filter bag, so as to avoid water-reducing agent powder flows out hothouse with hot wind and causes air dirty Dye and wastage of material.

The utility model is further arranged to: percussion mechanism is equipped with above the frame plate, the percussion mechanism includes level The motor being fixedly connected on the hothouse, connecting eccentric wheel on the output shaft of the motor, the output shaft of the motor with The distance between described frame plate upper surface be greater than the eccentric wheel minimum diameter and be less than the eccentric wheel maximum gauge.

By using above-mentioned technical proposal, when the drying device has accumulated more subtract after a period of work, in filter bag Aqua powder, the water-reducing agent powder being attached on filter bag will affect the gas permeability of filter bag, open motor at this time, drive motor inclined The rotation of heart wheel, so that intermittent impact frame plate, makes frame plate generate vibration, the vibration of frame plate drives filter bag shake, thus will filter The water-reducing agent powder adhered in bag is shaken off, it is made to have settled out water-reducing agent powder together from discharge port with hothouse bottom Outflow, so that filter bag be made to restore permeability.

The utility model is further arranged to: supporting table is equipped with below the frame plate, the outer circle of the supporting table is fixed to be connected It is connected on the side wall of the hothouse, is supported between the supporting table and the frame plate by several elastic components.

By using above-mentioned technical proposal, the setting of elastic component support frame plates can make frame plate in the impact by eccentric wheel Vibration by a larger margin is generated afterwards, so that shake filter bag by a larger margin, falls its internal water-reducing agent powder adhered to more Add thoroughly.

The utility model is further arranged to: agitating device is equipped in the hothouse, the agitating device includes rotation The agitating shaft and the stirring motor above the orifice plate being connected among the orifice plate, the agitating shaft upper end pass through described Orifice plate is coaxially connected on the output shaft of the stirring motor, and the agitating shaft is located at one end below the orifice plate and is equipped with paddle Piece.

By using above-mentioned technical proposal, stirring motor drives agitating shaft and stirring blade rotation to be sunken to hothouse to stir The water-reducing agent of bottom, to accelerate the evaporation of the unseasoned thorough water-reducing agent in hothouse bottom, so that is made it dry is more thorough Bottom and uniformly, and the setting of agitating device can also be logical during the indoor water-reducing agent powder of drying is flowed out from discharge port Crossing stirring prevents water-reducing agent powder agglomates and stuck in discharge outlet, influences the outflow of discharge outlet water-reducing agent powder.

The utility model is further arranged to: the hothouse lower end is funnel-shaped, and the discharge port is set to the drying The lowest point of room, the discharge outlet are equipped with the valve of control discharge port folding.

By using above-mentioned technical proposal, funnelform hothouse can guarantee to dry indoor water-reducing agent powder from discharging Mouth flows out more thorough, controls the folding of discharge port by valve to control and enter the indoor water-reducing agent of drying in hothouse Interior residence time, what is made it dry is more thorough, and the water-reducing agent powder not being completely dried also is avoided to flow out from discharge port.

The utility model is further arranged to: the valve is butterfly valve, and butterfly valve includes flap and valve rod, the flap it is outer Shape and the inner wall shape of the discharge port are mutually agreed with, and the valve rod is parallel with the flap and runs through the flap, the valve rod It is rotationally connected on the discharge port through the both ends of the flap, described valve rod one end is through the discharge port and in traversing through end Equipped with handwheel.

By using above-mentioned technical proposal, rotation hand wheel can be such that flap rotates in discharge port, when flap turns in parallel When the internal diameter of discharge port, discharge port is closed, and dry indoor water-reducing agent powder will not flow out；When flap turn to not with discharging When mouth is vertical, discharge port is gradually opened, and when flap is turned to perpendicular to discharge port, discharge port is opened to maximum, discharge outlet The flow of water-reducing agent powder reach maximum.

In conclusion the advantageous effects of the utility model are as follows:

By the sandwich establishment space in the side wall of hothouse, hot steam is passed through in interlayer space, not by hot steam Break and heats to hothouse and make to dry the more thorough of indoor water-reducing agent drying；

1. being controlled and being passed into hot wind in hothouse by the inclusion of the hot-air channel of collapsible tube, trunnion and enlarged tube The flow velocity of hot wind, and liquor inlet is located at the maximum trunnion of hot wind flow velocity, to make feed liquid under the impact of hot wind into one Step atomization, increases the evaporation efficiency of vapor in feed liquid；

2. by the filter device for being provided with filter bag, so that water-reducing agent powder be avoided to cause with hot wind outflow hothouse Environmental pollution and wastage of material；

3. by knitting valve in discharge port color, and agitating device is arranged in lower section in sub- hothouse, to increase water-reducing agent The residence time in hothouse, and water-reducing agent is stirred to accelerate its drying simultaneously, further ensure water-reducing agent It is thoroughly dry.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model.

Fig. 2 is the partial sectional view of the utility model.

In figure, 1, hothouse；11, discharge port；12, air outlet；13, interlayer space；131, steam inlet duct；132, steam Gas outlet；2, hot-air channel；21, collapsible tube；22, trunnion；23, enlarged tube；3, liquor inlet；31, feed liquid spray head；32, feed liquor Pipe；4, liquid pump；5, feed liquid cylinder；6, air-heater；7, every powder device；71, filter bag；72, orifice plate；721, depositing dust hole；73, frame plate；8, Percussion mechanism；81, motor；82, eccentric wheel；83, supporting table；84, elastic component；9, agitating device；91, stirring motor；92, it stirs Axis；93, stirring blade；10, valve；101, flap；102, valve rod；103, handwheel.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

Referring to Fig.1, Fig. 2 is a kind of polycarboxylate water-reducer powder production drying device disclosed by the utility model, including dry Dry room 1,1 side of hothouse are connected with hot-air channel 2 and liquor inlet 3, and liquor inlet 3 is connected with hot-air channel 2, and hot wind is logical Road 2 includes the collapsible tube 21, trunnion 22 and enlarged tube 23 of successively drop-over, and liquor inlet 3 is opened on the side wall at trunnion 22, is expected Liquid import 3 connects the feed liquid spray head 31 of injection feed liquid in oriented hot-air channel 2, connects inlet tube 32, inlet tube outside liquor inlet 3 32 other ends are connected with feed liquid cylinder 5, and liquid pump 4 is connected on inlet tube 32；Hot-air channel 2 connects heat far from one end of hothouse 1 Blower 6,1 lower inside of hothouse is provided with discharge port 11, inner upper is provided with every powder device 7, can prevent every powder device 7 Powdered water-reducing agent is taken out of by hot wind from air outlet 12, and the communication port of hot-air channel 2 and hothouse 1 is opened in every powder device 7 Between discharge port 11, in every offering air outlet 12 outside powder device 7 on 1 side wall of hothouse, it is provided in the side wall of hothouse 1 Interlayer space 13 is provided with steam inlet duct 131 on the outside of hothouse 1, and steam inlet duct 131 is connected with interlayer space 13, folder 13 lateral wall of sheaf space is equipped with steam gas outlet 132.

Hot wind enters from 21 one end of collapsible tube, and passes sequentially through collapsible tube 21, trunnion 22 and enlarged tube 23 and enter drying In room 1, when hot wind enters in trunnion 22 from collapsible tube 21, since the diameter at trunnion 22 is less than the straight of 21 inlet of collapsible tube Diameter, when hot wind is flowed into trunnion 22 from collapsible tube 21, flow velocity is gradually accelerated, and when at trunnion 22, the flow velocity of hot wind reaches maximum, Inlet tube 32 extracts feed liquid by liquid pump 4 from feed liquid cylinder 5, and feed liquid is sprayed by feed liquid spray head 31 from trunnion 22, and this The hot wind flow velocity at place is higher, therefore can hit the feed liquid of the ejection of feed liquid spray head 31 and make its atomization to improve moisture in feed liquid Evaporation rate；The feed liquid of this atomization rapid evaporation under the action of hot wind falls moisture and by solid solute (water-reducing agent powder) It stays in hothouse 1, water-reducing agent powder is built up, and can finally be flowed out from discharge port 11.

The water-reducing agent for falling to 1 bottom of hothouse can have dry incomplete phenomenon, can pass through steam inlet duct at this time It is passed through hot steam in 131 interlayer space 13 into hothouse 1, is continued by hot steam to the water-reducing agent heating in hothouse 1 To accelerate the drying of water-reducing agent, to make the more thorough of the water-reducing agent drying for sinking to 1 bottom of hothouse.

It include filter bag 71 every powder device 7, end closure setting, lower ending opening are arranged on filter bag 71, in hothouse 1 referring to Fig. 2 Lower section is fixedly connected with abacus 72, top is provided with frame plate 73, and depositing dust hole 721 is offered on orifice plate 72, and 71 upper end of filter bag is fixed It is connected to 73 upper and lower end peripheral wall of frame plate to be fixedly connected with 721 peripheral wall of depositing dust hole, the import of hot-air channel 2 is set to hothouse 1 In on the side wall of 72 lower section of orifice plate, air outlet 12 is set to hothouse 1 on the side wall between orifice plate 72 and frame plate 73.

The course of work every powder device 7 is: the water-reducing agent powder and vapor carried secretly from the hot wind that hot-air channel 2 comes out Into after in hothouse 1, part water-reducing agent powder falls downward and be sunken to 1 bottom of hothouse, other water-reducing agent powder with Hot wind to the top of hothouse 1 flow, due in hothouse 1 be equipped with orifice plate 72 block, hot wind is merely able to pass through depositing dust Hole 721 enter filter bag 71, and from filter bag 71 flow out, through air outlet 12 be discharged hothouse 1 outside, in the process, with hot wind to The water-reducing agent powder flowed above hothouse 1 can be adhered to 71 inside of filter bag, so as to avoid water-reducing agent powder with hot wind It flows out hothouse 1 and causes air pollution and wastage of material.

Referring to Fig. 2, its inside adheres to excessive water-reducing agent powder and influences filter bag after filter bag 71 is used for a long time in order to prevent 71 gas permeability, percussion mechanism 8 is additionally provided with above frame plate 73, and percussion mechanism 8 includes on level is fixedly connected in hothouse 1 The motor 81 of side, connecting eccentric wheel 82 on the output shaft of motor 81, between 73 upper surface of output shaft and frame plate of motor 81 away from It is less than the maximum gauge of eccentric wheel 82 from the minimum diameter for being greater than eccentric wheel 82；It is provided with supporting table 83 below frame plate 73, props up The outer circle of support platform 83 is fixedly connected on the side wall of hothouse 1, passes through several elastic components 84 between supporting table 83 and frame plate 73 Support.

When the device after a period of work, open motor 81, make motor 81 with movable eccentric wheel 82 rotate, thus intermittent Impact frame plate 73, so that frame plate 73 is generated vibration, the vibration of frame plate 73 drives filter bag 71 to shake, to will adhere in filter bag 71 Water-reducing agent powder is shaken off, and flows out it from discharge port 11 together as 1 bottom of hothouse has settled out water-reducing agent powder, extensive The permeability of multiple filter bag 71.

Referring to Fig. 2,1 lower end of hothouse is funnel-shaped, and discharge port 11 is set to the lowest point of hothouse 1, at discharge port 11 Equipped with the valve 10 that control discharge port 11 opens and closes, the valve 10 in this embodiment of the utility model is butterfly valve, and butterfly valve includes flap 101 and valve rod 102, the shape of flap 101 mutually agree with the inner wall shape of discharge port 11, valve rod 102 is parallel with flap 101 and passes through Flap 101 is worn, valve rod 102 is rotationally connected on discharge port 11 through the both ends of flap 101, and discharge port is run through in 102 one end of valve rod 11 and traversing through end is provided with handwheel 103.

Can be manually rotated handwheel 103 can be such that flap 101 rotates in discharge port 11, be parallel to discharging when flap 101 turns to When the internal diameter of mouth 11, discharge port 11 is closed, and the water-reducing agent powder in hothouse 1 will not flow out, to rest on quilt in hothouse 1 Continue to heat with it is dry more thoroughly；When flap 101 is turned to it is not vertical with discharge port 11 when, discharge port 11 is gradually opened, When flap 101 is turned to perpendicular to discharge port 11, discharge port 11 is opened to maximum, dried water-reducing agent in hothouse 1 Powder can be flowed out by discharge port 11.

Stirring dress is provided in hothouse 1 in order to accelerate to drop the drying for the water-reducing agent for being sunken to 1 bottom of hothouse referring to Fig. 2 9 are set, agitating device 9 includes being rotationally connected with the agitating shaft 92 among orifice plate 72 and the stirring motor 91 above orifice plate 72, 92 upper end of agitating shaft is coaxially connected on the output shaft of stirring motor 91 across orifice plate 72, and agitating shaft 92 is located at 72 lower section one of orifice plate End is provided with stirring blade 93.

When stirring motor 91 rotates, agitating shaft 92 and the rotation of stirring blade 93 are able to drive to stir and is sunken to 1 bottom of hothouse The water-reducing agent in portion, to accelerate the evaporation of the unseasoned thorough water-reducing agent in 1 bottom of hothouse, what is made it dry is more thoroughly and equal It is even, and the setting of agitating device 9 can also pass through during the water-reducing agent powder in hothouse 1 is flowed out from discharge port 11 Stirring prevents water-reducing agent powder agglomates and is stuck at discharge port 11.

The embodiment of present embodiment is the preferred embodiment of the utility model, and not limitation is originally practical new according to this The protection scope of type, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by practical Within novel protection scope.

Claims (8)

1. a kind of polycarboxylate water-reducer powder production drying device, including hothouse (1), hothouse (1) side is equipped with heat Far from the hothouse (1) one end connection hot wind machine, institute occur for wind channel (2) and liquor inlet (3), the hot-air channel (2) It states and is equipped with feed liquid spray head (31) at liquor inlet (3), hothouse (1) lower inside is equipped with discharge port (11), inner upper Equipped with every powder device (7), the hot-air channel (2) and the liquor inlet (3) are set to described every powder device (7) and the discharging Between mouth (11), air outlet (12) are externally provided with every powder device (7) in described on hothouse (1) side wall, it is characterised in that: institute It states in the side wall of hothouse (1) and is equipped with interlayer space (13), be equipped with steam inlet duct (131) on the outside of the hothouse (1), it is described Steam inlet duct (131) is connected with the interlayer space (13), and interlayer space (13) lateral wall is equipped with steam outlet Mouth (132).

2. polycarboxylate water-reducer powder production drying device according to claim 1, it is characterised in that: the liquor inlet (3) be connected with the hot-air channel (2), the hot-air channel (2) include the collapsible tube (21) of successively drop-over, trunnion (22) and Enlarged tube (23), the liquor inlet (3) are set at the trunnion (22), and the liquor inlet (3) connects inlet tube (32) outside, Inlet tube (32) other end is connected with feed liquid cylinder (5), is connected with liquid pump (4) on the inlet tube (32).

3. polycarboxylate water-reducer powder production drying device according to claim 1, it is characterised in that: described every powder device It (7) include filter bag (71), end closure setting, lower ending opening setting on the filter bag (71), the interior lower section of the hothouse (1) is equipped with Orifice plate (72), top are equipped with frame plate (73), offer depositing dust hole (721) on the orifice plate (72), filter bag (71) upper end is solid Surely it is connected to the frame plate (73) upper and lower end peripheral wall to be fixedly connected with depositing dust hole (721) peripheral wall, the hot-air channel (2) Import be set to the hothouse (1) be located on the side wall below the orifice plate (72), the air outlet (12) be set to it is described do Dry room (1) is on the side wall between the orifice plate (72) and the frame plate (73).

4. polycarboxylate water-reducer powder production drying device according to claim 3, it is characterised in that: the frame plate (73) Top is equipped with percussion mechanism (8), and the percussion mechanism (8) includes the motor that level is fixedly connected on the hothouse (1) (81), connecting eccentric wheel (82) on the output shaft of the motor (81), output shaft and the frame plate (73) of the motor (81) The distance between upper surface be greater than the eccentric wheel (82) minimum diameter and be less than the eccentric wheel (82) maximum gauge.

5. polycarboxylate water-reducer powder production drying device according to claim 4, it is characterised in that: the frame plate (73) Lower section is equipped with supporting table (83), and the outer circle of the supporting table (83) is fixedly connected on the side wall of the hothouse (1), the branch It supports and is supported between platform (83) and the frame plate (73) by several elastic components (84).

6. polycarboxylate water-reducer powder production drying device according to claim 3, it is characterised in that: the hothouse (1) agitating device (9) are equipped in, the agitating device (9) includes being rotationally connected with the intermediate agitating shaft of the orifice plate (72) (92) and the stirring motor (91) above the orifice plate (72), agitating shaft (92) upper end pass through the orifice plate (72) together In on the output shaft of the stirring motor (91), the agitating shaft (92) is located at one end below the orifice plate (72) and is equipped with axis connection Stirring blade (93).

7. polycarboxylate water-reducer powder production drying device according to claim 1, it is characterised in that: the hothouse (1) lower end is funnel-shaped, and the discharge port (11) is set to the lowest point of the hothouse (1), is equipped at the discharge port (11) Control the valve (10) of discharge port (11) folding.

8. polycarboxylate water-reducer powder production drying device according to claim 7, it is characterised in that: the valve (10) For butterfly valve, butterfly valve includes flap (101) and valve rod (102), the shape and the inner wall of the discharge port (11) of the flap (101) Shape is mutually agreed with, and the valve rod (102) is parallel with the flap (101) and runs through the flap (101), the valve rod (102) It is rotationally connected on the discharge port (11) through the both ends of the flap (101), described valve rod (102) one end goes out described in Material mouth (11) and in traversing through end be equipped with handwheel (103).