CN212582241U

CN212582241U - Drum and linen dryer comprising same

Info

Publication number: CN212582241U
Application number: CN202021625457.9U
Authority: CN
Inventors: 孙晓美; 高海玉; 管宇飞; 王存炎; 田辉; 王�锋
Original assignee: Chengde Yundi Intelligent Technology Co ltd
Current assignee: Chengde Yundi Intelligent Technology Co ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2021-02-23
Anticipated expiration: 2030-08-04

Abstract

The utility model provides a roller and a linen dryer comprising the roller, which is a barrel structure with two open ends, a stop block is arranged on the inner wall of the roller, a plurality of through holes which are arranged in a penetrating way and are used for the inlet and the outlet of heating steam are arranged on the wall of the roller, the number of the stop blocks is a plurality, the stop blocks are evenly distributed along the circumferential direction of the roller, each stop block comprises a first spiral block, a second spiral block and a third spiral block, and the first spiral block, the second spiral block and the third spiral block are respectively arranged along the inner wall of the roller in a spiral way, the first spiral block is positioned at the first end of the roller, the second spiral block is positioned at the second end of the roller, the third spiral block is positioned between the first spiral block and the second spiral block, and the first end of the third spiral block is connected with the first spiral block, the second end is connected with the second spiral block, and the thread pitch of the first spiral block and the thread pitch of the second spiral block are both smaller than the thread pitch of the third spiral block. The roller can realize continuous feeding and continuous discharging of the dried linen, so that the drying efficiency of the linen dryer is higher.

Description

Drum and linen dryer comprising same

Technical Field

The utility model relates to a linen dries technical field, and more specifically says, relates to a cylinder and including the linen drying-machine of this cylinder.

Background

The prior art linen dryer typically comprises a housing, a drum and an air exhaust. The roller is rotatably arranged in a shell, an opening is arranged on the shell, and the opening is communicated with the interior of the roller and is used for placing or taking out linen into the roller from the opening. The outer circumferential wall of the roller is provided with a through hole for the heat supply steam to enter and exit, and under the action of the exhaust device, the heat supply steam enters the shell and then enters the roller so as to heat and dry the clothes in the roller. However, the linen dryer has only one opening, feeding and discharging are carried out at the opening, after drying is completed, the linen dryer needs to be stopped, linen in the roller is taken out and placed into new linen to be dried, continuous feeding and discharging cannot be achieved, drying efficiency is low, and drying requirements of a linen washing production line cannot be met. Therefore, how to solve the problem of low drying efficiency of the linen dryer in the prior art is a technical problem set which needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can improve cloth grass drying-machine's drying efficiency's cylinder and cloth grass drying-machine including this cylinder.

In order to solve the above problem, the utility model provides a roller, it is both ends open-ended tubular structure, be equipped with the dog on the cylinder inner wall, be equipped with a plurality of perforating holes that link up the setting with the discrepancy of heat supply steam on the section of thick bamboo wall of roller, the quantity of dog is a plurality of, and is a plurality of the dog is followed the circumference evenly distributed of roller, each the dog all includes first spiral piece, second spiral piece and third spiral piece, just first spiral piece second spiral piece with third spiral piece follows respectively the inner wall spiral setting of roller and the three is rotated to the same, first spiral piece is located the first end of roller, second spiral piece is located the second end of roller, third spiral piece is located between first spiral piece and the second spiral piece, just third spiral piece first end with first spiral piece is connected, The second end with the second spiral piece is connected, the pitch of first spiral piece with the pitch of second spiral piece all is less than the pitch of third spiral piece.

Preferably, the pitch of the first screw block is equal to the pitch of the second screw block.

The utility model also provides a linen drying-machine, including shell and cylinder, the cylinder is as above arbitrary the cylinder, the cylinder rotationally set up in the inside of shell, the shell with the position that the first end of cylinder corresponds is equipped with the feed inlet, the shell with the position that the cylinder second end corresponds is provided with the discharge gate, still be equipped with on the shell respectively with the air inlet and the gas vent of the inside intercommunication of shell.

Preferably, the drum-type washing machine further comprises a feeding channel and a discharging channel, wherein the first end of the feeding channel penetrates through the feeding hole and is communicated with the first end of the drum, the first end of the discharging channel penetrates through the discharging hole and is communicated with the second end of the drum, and the second end of the discharging channel is arranged downwards.

Preferably, the feed channel second end and the discharging channel second end all are equipped with the on-off valve, each on-off valve all includes first drive arrangement, transmission shaft and two apron, two the apron rotationally set up in feed channel perhaps in the discharging channel through the pivot, two when the apron is in the first state, can the shutoff feed channel perhaps discharging channel, two when the apron is in the second state, can open feed channel perhaps discharging channel, the transmission shaft rotationally set up in on the lateral wall of feed channel or on discharging channel's lateral wall, just the transmission shaft respectively through bevel gear transmission simultaneously with two the pivot is rotationally connected, first drive arrangement is used for driving the transmission shaft rotates.

Preferably, the second end of the feeding channel and/or the second end of the discharging channel are/is provided with two opening and closing valves, a feeding transition bin is formed in a space between the two opening and closing valves at the second end of the feeding channel, and a discharging transition bin is formed in a space between the two opening and closing valves at the second end of the discharging channel.

Preferably, the second end of the feeding channel and the second end of the discharging channel are both provided with position detection devices.

Preferably, the outer circumferential surface of the drum is provided with two annular rims, the two rims are respectively arranged at positions close to two ends of the drum, the linen dryer further comprises a rotatable supporting wheel and a second driving device for driving the supporting wheel to rotate, the supporting wheel is arranged in the shell and supports the rims, each rim is supported by the two supporting wheels, and the second driving device is arranged at least one supporting wheel.

Preferably, two vertical partition plates and two horizontal partition plates are arranged in the shell, the two vertical partition plates are vertically arranged in the shell, the two vertical partition plates are respectively arranged at positions close to two ends of the roller, avoidance holes for the roller to pass through are respectively arranged on the two partition plates, the through hole on the roller is positioned between the two partition plates along the axial distribution area of the roller, the supporting wheel and the second driving device are positioned outside the two partition plates, the two horizontal partition plates are horizontally arranged between the two vertical partition plates, the two horizontal partition plates extend along the axial direction of the roller, the two horizontal partition plates are respectively arranged at two sides of the roller, one side of each of the two horizontal partition plates is connected with the inner wall of the shell, the other side of each horizontal partition plate is abutted against the outer circumferential surface of the roller, and the air inlet and the air outlet are both positioned between the two vertical partition plates, one of the two is positioned above the horizontal clapboard, and the other is positioned below the horizontal clapboard.

Preferably, each supporting wheel is provided with a limiting flange for preventing the roller from axially displacing.

The utility model provides an among the technical scheme, a cylinder, it is both ends open-ended tubular structure, be equipped with the dog on the cylinder inner wall, be equipped with a plurality of perforating holes that link up the setting with the heat supply steam discrepancy on the section of thick bamboo wall of cylinder, the quantity of dog is a plurality of, the circumference evenly distributed of cylinder is followed to a plurality of dogs, each dog all includes first spiral piece, second spiral piece and third spiral piece, and first spiral piece, the inner wall spiral setting of cylinder is followed respectively to second spiral piece and third spiral piece, first spiral piece is located the first end of cylinder, the second spiral piece is located the second end of cylinder, the third spiral piece is located between first spiral piece and the second spiral piece, and the first end of third spiral piece is connected with first spiral piece, the second end is connected with second spiral piece, the pitch of first spiral piece and the pitch of second spiral piece all are less than the pitch of third spiral piece.

When the cloth grass drying machine is used, the roller is rotatably arranged in the shell of the cloth grass drying machine, the first end of the roller is opposite to the feeding hole in the shell, the second end of the roller is opposite to the discharging hole in the shell, cloth grass to be dried is fed into the first end of the roller from the feeding hole, and under the action of the stop block in the roller, the cloth grass gradually moves towards the second end of the roller until sliding off from the discharging hole. Due to the arrangement, the baffle block has a deflection angle, so that the linen in the roller can move along the baffle block due to the deflection angle of the baffle block when falling in the process of rolling along with the rotation of the roller, and the effect of moving the linen in the roller to the outlet side or the inlet side can be realized through the control of the forward rotation and the reverse rotation of the roller. The drying mainly takes place in the middle of the roller, so the deflection angles of the inlet and the outlet are large, which is beneficial to the linen to move to the middle area and unload quickly, and the deflection angle of the middle is small, which can ensure the linen to be dried in the main drying area for a long time. For the condition that the drying time is longer, the rotary drum can alternately rotate forwards and backwards, and the linen can continuously roll and dry near the middle area of the rotary drum until the drying requirement is met and then continuously rotate in a certain one-way direction to realize unloading. Continuous feeding and continuous discharging of the linen can be realized through the roller, so that the drying efficiency of the linen dryer is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a drum according to an embodiment of the present invention;

FIG. 2 is a front view of the drum of FIG. 1;

FIG. 3 is a schematic structural view of a linen dryer in an embodiment of the present invention;

FIG. 4 is a top view of the linen dryer of FIG. 3;

FIG. 5 is a B-B sectional view of the linen dryer of FIG. 4;

FIG. 6 is a C-C sectional view of the linen dryer of FIG. 5;

fig. 7 is a schematic structural diagram of an outer shell in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an opening and closing valve in an embodiment of the present invention;

FIG. 9 is a schematic view of the engagement between the roller and the supporting wheel according to the embodiment of the present invention;

FIG. 10 is a front view of the drum of FIG. 9 engaged with a support wheel;

fig. 11 is a schematic structural diagram of a feeding transition bin in an embodiment of the present invention.

In fig. 1-11:

1. a through hole; 2. a first screw block; 3. a second screw block; 4. a third screw block; 5. A housing; 6. an air inlet; 7. an exhaust port; 8. a feed channel; 9. a discharge channel; 10. a cover plate; 11. a drive shaft; 12. a rotating shaft; 13. a first driving device; 14. a rim; 15. a support wheel; 16. a second driving device; 17. a vertical partition; 18. a horizontal partition plate; 19. a limiting flange; 20. a support; 21. a position detection device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1 to 11, an embodiment of the present invention provides a drum suitable for a linen dryer, the drum is of a cylindrical structure with two open ends, and preferably, the drum is a cylinder. The inner wall of the roller is provided with a stop block, and the wall of the roller is provided with a plurality of through holes 1 which are arranged in a penetrating way and used for the heat supply steam to come in and go out. For example, there are multiple sets of through holes 1, the number of the through holes 1 in each set is multiple, the through holes 1 in each set are uniformly distributed along the circumferential direction of the drum, and the multiple sets of through holes 1 are uniformly distributed along the axial direction of the drum. The number of the stoppers is plural, for example, as shown in fig. 1, the number of the stoppers may be three. A plurality of dogs are along the circumference evenly distributed of cylinder, and each dog all includes first spiral piece 2, second spiral piece 3 and third spiral piece 4, and first spiral piece 2, second spiral piece 3 and third spiral piece 4 set up and the three revolves to the same along the inner wall spiral of cylinder respectively. The cross sections of the first spiral block 2, the second spiral block 3 and the third spiral block 4 perpendicular to the respective paths are the same, for example, the cross sections of the first spiral block, the second spiral block and the third spiral block are all triangular, and a round angle is arranged at the tip of the triangle to prevent the tip of the stop block from damaging the linen. First spiral piece 2 is located the first end of cylinder, and second spiral piece 3 is located the second end of cylinder, and third spiral piece 4 is located between first spiral piece 2 and the second spiral piece 3, and the first end of third spiral piece 4 is connected with first spiral piece 2, and the second end of third spiral piece 4 is connected with second spiral piece 3. The screw pitch of the first screw block 2 and the screw pitch of the second screw block 3 are both smaller than the screw pitch of the third screw block 4. Optionally, the pitch of the first screw block 2 is equal to the pitch of the second screw block 3.

When the cloth grass drying machine is used, the roller is rotatably arranged inside the shell 5 of the cloth grass drying machine, the first end of the roller is opposite to the feeding hole in the shell 5, the second end of the roller is opposite to the discharging hole in the shell 5, cloth grass to be dried is fed into the first end of the roller from the feeding hole, and under the action of the stop block in the roller, the cloth grass gradually moves towards the second end of the roller until sliding off from the discharging hole. Due to the arrangement, the baffle block has a deflection angle, so that the linen in the roller can move along the baffle block due to the deflection angle of the baffle block when falling in the process of rolling along with the rotation of the roller, and the effect of moving the linen in the roller to the outlet side or the inlet side can be realized through the control of the forward rotation and the reverse rotation of the roller. Because the drying mainly takes place in the middle of the roller, the inlet and outlet deflection angles are large (namely the screw pitch is small), which is beneficial to the linen to move to the middle area and unload quickly, and the middle deflection angle is small (namely the screw pitch is large) which can ensure the linen to be dried in the main drying area for a long time. Referring to the first, second and third spiral blocks 2, 3 and 4 marked in fig. 2, the deflection angles of the first and second spiral blocks 2 and 3 are large and the whole is steeper, so that the time for the linen to pass through the areas of the first and second spiral blocks 2 and 3 is shorter, the deflection angle of the third spiral block 4 is smaller and the whole tends to be gentle, and the time for the linen to pass through the area of the third spiral block 4 is longer. For the condition that the drying time is longer, the rotary drum can alternately rotate forwards and backwards, and the linen can continuously roll and dry near the middle area of the rotary drum until the drying requirement is met and then continuously rotate in a certain one-way direction to realize unloading. Continuous feeding and continuous discharging of the linen can be achieved through the roller, the drying process does not need to be stopped, and the linen dryer is higher in drying efficiency.

Referring to fig. 1 to 11, the embodiment of the present invention further provides a linen dryer, which includes a housing 5 and a drum, wherein the drum is the drum described in any one of the above embodiments. A cavity is arranged inside the housing 5 and the drum is rotatably arranged inside the drum. The position that shell 5 and cylinder first end correspond is equipped with the feed inlet, and the position that shell 5 and cylinder second end correspond is provided with the discharge gate. The shell 5 is also provided with an air inlet 6 and an air outlet 7 which are respectively communicated with the inside of the shell 5, the air inlet 6 is communicated with hot steam through a pipeline, and the air outlet 7 is communicated with an air draft device, such as an air inlet of a centrifugal fan, through a pipeline. Under the suction action of the centrifugal fan, hot steam enters the shell 5 from the air inlet 6, enters the roller from the through hole 1 of the roller wall, heats and dries linen, and is discharged from the air outlet 7 and enters the centrifugal fan. For example, as shown in fig. 7, the intake port 6 in the present embodiment is provided above the housing 5, and the exhaust port 7 is provided below the housing 5. It should be noted that the linen dryer includes the above-mentioned drum, and has the advantages of the drum, and the details about the beneficial effects of the linen dryer are not repeated.

Referring to fig. 3-7, in some embodiments, the linen dryer further comprises a feed channel 8 and a discharge channel 9. The first end of feed channel 8 passes the feed inlet and communicates with the first end of cylinder, and the second end of feed channel 8 sets up. Therefore, the linen to be dried can be placed from the first end of the feeding channel 8, and then the linen to be dried slides into the roller along the feeding channel 8. When in use, the second end opening of the feeding channel 8 can be arranged below the linen conveying device, so that the dried or pressed linen can be directly conveyed into the feeding channel 8. Referring to fig. 5, optionally, the first end of the feeding channel 8 extends into the first end of the drum to communicate with the drum, so that the linen in the feeding channel 8 can enter the drum conveniently. The first end of discharging channel 9 passes the discharge gate and holds the intercommunication with the cylinder second, and discharging channel 9's second end sets up down. Thus, under the action of the stop block in the roller, the dried linen enters the discharge channel 9 from the second end of the roller and is discharged. Referring to fig. 5, the first end of the discharge channel 9 is optionally sleeved outside the second end of the drum. So set up, be more convenient for cloth grass in the cylinder to enter into discharging channel 9. When the drying device is used, a containing device can be arranged below the second end of the discharging channel 9 to contain dried linen.

Referring to fig. 5, in some embodiments, the second end of the feeding channel 8 and the second end of the discharging channel 9 are provided with an on-off valve. Referring to fig. 8, each of the opening and closing valves includes a first driving device 13, a transmission shaft 11 and two cover plates 10. The two cover plates 10 are rotatably arranged in the feed channel 8 or the discharge channel 9 by means of a rotary shaft 12, for example, the rotary shaft 12 is fixedly arranged on each of the two cover plates 10, and each rotary shaft 12 is rotatably connected to a side wall of the feed channel 8 or a side wall of the discharge channel 9 by means of a bearing. When the two cover plates 10 are in the first state, namely the two cover plates are in the horizontal state, the feeding channel 8 or the discharging channel 9 can be blocked, and when the two cover plates 10 are in the second state, namely the two cover plates rotate downwards, the feeding channel 8 or the discharging channel 9 can be opened. The drive shaft 11 is rotatably arranged on the outer side wall of the feed channel 8 or on the outer side wall of the discharge channel 9, for example, a support 20 is arranged on the outer side wall of the feed channel 8 or on the outer side wall of the discharge channel 9, and the drive shaft 11 is rotatably mounted on the support 20. The transmission shafts 11 are respectively and rotatably connected with the two rotating shafts 12 through bevel gear transmission, so that when the transmission shafts 11 rotate, the two cover plates 10 can be driven to be opened downwards or closed upwards simultaneously. The first drive means 13 is used to drive the drive shaft 11 in rotation, for example, the first drive means 13 is also connected to the drive shaft 11 by means of a bevel gear drive. The first drive means 13 may be a motor, for example a stepper motor. The opening and closing valves are arranged at the two positions of the feeding channel 8 and the discharging channel 9, so that the opening and closing valves can be opened in the feeding process or the discharging process to enable linen to enter or be discharged, and the opening and closing valves are closed when no linen enters or is discharged, so that the loss of hot steam in the roller is reduced.

In some embodiments, the second end of the feed channel 8 and the second end of the discharge channel 9 are provided with position detection means 21. For example, the position detecting device 21 may be a photoelectric switch, which is called a photoelectric proximity sensor, and belongs to the prior art. When the linen passes through the position detection device 21, the position detection device 21 obtains a signal and can transmit the signal to the controller, the controller can control the first driving device 13 to start, so that the cover plate 10 is controlled to be opened, and after the linen enters or is discharged, the controller controls the first driving device 13 to close the cover plate 10.

Referring to fig. 11, in some embodiments, the second end of the feeding channel 8 and/or the second end of the discharging channel 9 are provided with two open/close valves. Wherein, the space between two opening and closing valves of the second end of the feeding channel 8 forms a feeding transition bin, and the space between two opening and closing valves of the second end of the discharging channel 9 forms a discharging transition bin. Through setting up feeding transition bin, on the one hand when the cloth grass is more in the cylinder, can deposit the cloth grass of treating drying temporarily, it is too much and lead to the stoving effect not good to prevent cloth grass in the cylinder, on the other hand, during the use, can open the on-off valve that is in the top in two on-off valves of feedstock channel 8 department earlier, the cloth grass enters into feeding transition bin after, the on-off valve that will be in the top is closed earlier, open the on-off valve that is in the below again, so that the cloth grass enters into the cylinder in, whole feeding process can make the cylinder be in airtight state all the time like this, basically, there is not the steam escape. The principle of ejection of compact transition storehouse and feeding transition storehouse in discharging channel 9 department is similar, and temporary storage and ejection of compact process are sealed promptly, and concrete operation process is no longer detailed.

Referring to fig. 9 to 10, in some embodiments, the circumferential surface of the drum is provided with two annular rims 14, the two rims 14 are respectively disposed at positions close to both ends of the drum, the linen dryer further includes a rotatable supporting wheel 15 and a second driving device 16 for driving the supporting wheel 15 to rotate, the supporting wheel 15 is disposed in the housing 5 and supports the rims 14, each rim 14 is supported by two supporting wheels 15, and the second driving device 16 is disposed at least one of the supporting wheels 15. Alternatively, the second driving device 16 may be a motor or a reduction motor, and an output shaft of the motor or the reduction motor may be in transmission connection with an axle of the support wheel through a coupling. Alternatively, the support wheel 15 is a gear and the rim 14 is a gear ring, the support wheel 15 is in gear engagement with the rim 14, or both the support wheel 15 and the rim 14 are friction wheels, and both are in friction fit transmission.

As shown with reference to fig. 9-10, each support wheel 15 is optionally provided with a stop flange 19 to prevent axial displacement of the drum. In the posture of the drum shown in fig. 10, the limit flange 19 of the left support wheel 15 is provided on the left end surface thereof and extends in the radial direction thereof so as to abut against the left end surface of the left rim 14, and the limit flange 19 of the right support wheel 15 is provided on the right end surface thereof and extends in the radial direction thereof so as to abut against the right end surface of the right rim 14. So set up, can prevent that the cylinder from turning the in-process and producing the displacement leftwards or rightwards.

Referring to fig. 5-7, in some embodiments, two vertical partitions 17 and two horizontal partitions 18 are provided within the housing 5. Two vertical baffles 17 are vertically arranged in the housing 5, and the two vertical baffles 17 are respectively arranged at the positions close to the two ends of the drum. All be equipped with the dodge hole that supplies the cylinder to pass on two baffles, perforating hole 1 on the cylinder is located between two baffles along the axial distribution region of cylinder, and supporting wheel 15 and second drive arrangement 16 all are located outside two baffles, and air inlet 6 and gas vent 7 all are located between two vertical baffles 17. Referring to fig. 7, the hot steam coming from the air inlet 6 cannot escape along the space between the outer wall of the drum and the inner wall of the casing 5 in the direction of both ends of the drum due to the barrier effect of the two vertical partitions 17.

Referring to fig. 5-7, two horizontal partitions 18 are horizontally disposed between the two vertical partitions 17. Two horizontal clapboards 18 all extend along the cylinder axial, and two horizontal clapboards 18 set up respectively in the both sides of cylinder, and two horizontal clapboards 18 all one side and shell 5 inner wall connection, and the opposite side offsets with the cylinder outer peripheral surface. Referring to fig. 7, one of the air inlet 6 and the air outlet is located above the horizontal partition 18, and the other is located below the horizontal partition 18. For example, the air inlet 6 is arranged above, the air outlet is arranged below, and due to the arrangement of the partition of the horizontal partition plate 18, the hot steam entering the interior of the shell 5 from the air inlet 6 cannot directly enter the air outlet along the space between the outer wall of the drum and the inner wall of the shell 5 to be discharged, but must pass through the interior of the drum, so that the loss of the hot steam is reduced, and the utilization rate of the hot steam is improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roller is characterized in that the roller is of a cylindrical structure with openings at two ends, a plurality of stop blocks are arranged on the inner wall of the roller, a plurality of through holes (1) which are arranged in a penetrating way and used for allowing heat supply steam to enter and exit are formed in the wall of the roller, the number of the stop blocks is multiple, the stop blocks are uniformly distributed along the circumferential direction of the roller, each stop block comprises a first spiral block (2), a second spiral block (3) and a third spiral block (4), the first spiral block (2), the second spiral block (3) and the third spiral block (4) are spirally arranged along the inner wall of the roller respectively, the three spiral directions are the same, the first spiral block (2) is positioned at the first end of the roller, the second spiral block (3) is positioned at the second end of the roller, the third spiral block (4) is positioned between the first spiral block (2) and the second spiral block (3), and the first end of third spiral piece (4) with first spiral piece (2) are connected, the second end with second spiral piece (3) are connected, the pitch of first spiral piece (2) with the pitch of second spiral piece (3) all is less than the pitch of third spiral piece (4).

2. The drum as claimed in claim 1, characterized in that the pitch of the first helical block (2) is equal to the pitch of the second helical block (3).

3. A linen dryer is characterized by comprising a shell (5) and a roller, wherein the roller is the roller in any one of claims 1-2 and is rotatably arranged in the shell (5), a feeding hole is formed in the shell (5) at a position corresponding to a first end of the roller, a discharging hole is formed in the shell (5) at a position corresponding to a second end of the roller, and an air inlet (6) and an air outlet (7) which are respectively communicated with the interior of the shell (5) are further formed in the shell (5).

4. The linen dryer as claimed in claim 3, further comprising a feed channel (8) and a discharge channel (9), wherein a first end of the feed channel (8) is communicated with the first end of the drum through the feed inlet, a first end of the discharge channel (9) is communicated with the second end of the drum through the discharge outlet, and a second end of the discharge channel (9) is arranged downwards.

5. Linen dryer according to claim 4, wherein the second end of the feeding channel (8) and the second end of the discharging channel (9) are provided with on-off valves, each of the on-off valves comprises a first driving device (13), a transmission shaft (11) and two cover plates (10), the two cover plates (10) are rotatably arranged in the feeding channel (8) or the discharging channel (9) through a rotating shaft (12), the two cover plates (10) can block the feeding channel (8) or the discharging channel (9) when in a first state, the two cover plates (10) can open the feeding channel (8) or the discharging channel (9) when in a second state, the transmission shaft (11) is rotatably arranged on the outer side wall of the feeding channel (8) or the outer side wall of the discharging channel (9), the transmission shafts (11) are respectively and rotatably connected with the two rotating shafts (12) through bevel gear transmission, and the first driving device (13) is used for driving the transmission shafts (11) to rotate.

6. Linen dryer according to claim 5, wherein said second end of the feeding channel (8) and/or said second end of the discharging channel (9) is provided with two said on-off valves, the space between said on-off valves of the second end of the feeding channel (8) constitutes a feeding transition bin, and the space between said on-off valves of the second end of the discharging channel (9) constitutes a discharging transition bin.

7. Linen dryer as in claim 5, wherein both the second end of the infeed channel (8) and the second end of the outfeed channel (9) are provided with position detection means (21).

8. The linen dryer as claimed in claim 3, wherein there are two annular rims (14) on the outer circumferential surface of the drum, two rims (14) are respectively disposed near two ends of the drum, the linen dryer further comprises a rotatable supporting wheel (15) and a second driving device (16) for driving the supporting wheel (15) to rotate, the supporting wheel (15) is disposed in the housing (5) and supports the rims (14), each rim (14) is supported by two supporting wheels (15), and the second driving device (16) is disposed at least one supporting wheel (15).

9. The linen dryer according to claim 8, wherein two vertical partitions (17) and two horizontal partitions (18) are provided in the housing (5), two vertical partitions (17) are vertically provided in the housing (5), and two vertical partitions (17) are respectively provided at positions close to both ends of the drum, both partitions are provided with an avoidance hole for the drum to pass through, the distribution area of the through hole (1) on the drum in the axial direction of the drum is located between the two partitions, the support wheel (15) and the second driving device (16) are both located outside the two partitions, two horizontal partitions (18) are horizontally provided between the two vertical partitions (17), both horizontal partitions (18) extend in the axial direction of the drum, both horizontal partitions (18) are respectively provided at both sides of the drum, and one side of each of the two horizontal clapboards (18) is connected with the inner wall of the shell (5), the other side of each of the two horizontal clapboards is abutted against the outer circumferential surface of the roller, the air inlet (6) and the air outlet (7) are both positioned between the two vertical clapboards (17), one of the air inlet and the air outlet is positioned above the horizontal clapboard (18), and the other one of the air inlet and the air outlet is positioned below the horizontal clapboard (18).

10. Linen dryer as in claim 8, wherein each support wheel (15) is provided with a stop flange (19) preventing axial displacement of the drum.