CN107937631B

CN107937631B - Processing method of cow leather sofa leather with low VOC volatilization

Info

Publication number: CN107937631B
Application number: CN201711381141.2A
Authority: CN
Inventors: 宓林飞
Original assignee: Wenzhou Shunheng Leather Co Ltd
Current assignee: Wenzhou Shunheng Leather Co., Ltd
Priority date: 2017-12-20
Filing date: 2017-12-20
Publication date: 2020-01-10
Anticipated expiration: 2037-12-20
Also published as: CN107937631A; CN110669879A

Abstract

The invention provides a processing method of cow leather sofa leather with low VOC volatilization. The method solves the technical problems that the prior leather processing method needs a large amount of additives, can generate a large amount of volatile organic compounds, has heavy product odor and the like. The processing method of the cow leather sofa leather with low VOC volatilization comprises the following steps: a. unhairing; b. softening; c. tanning; d. retanning; e. rinsing; f. dyeing; g. fat liquoring; h. squeezing water; i. vacuum drying; j. naturally hanging and airing; k. moisture regain, milling and finishing. The invention has the advantage of good environmental protection of the product.

Description

Processing method of cow leather sofa leather with low VOC volatilization

Technical Field

The invention relates to a processing method of cow leather sofa leather with low VOC volatilization.

Background

VOCs are acronyms for volatile organic compounds (volatile organic compounds). VOCs in the general sense are commanding organic matters; but the definition in the environmental protection sense refers to an active class of volatile organic compounds, namely, volatile organic compounds which can cause harm. The existing cowhide sofa leather generally has the following problems: the total carbon emission (total organic volatiles) is high and does not meet the environmental protection requirements.

The existing leather processing method needs to use a large amount of additives, can generate a large amount of volatile organic compounds, and has heavy product odor, so that the design of the processing method of the cowhide sofa leather with low VOC volatilization is necessary.

Disclosure of Invention

The invention aims to provide a processing method of cowhide sofa leather with low VOC volatilization, aiming at the problems in the prior art, and the processing method has the characteristic of good environmental protection of products.

The purpose of the invention can be realized by the following technical scheme: the processing method of the cow leather sofa leather with low VOC volatilization is characterized by comprising the following steps:

a. depilation: dehairing the raw skin one by one through a hair pushing machine;

b. softening: softening the dehaired raw hide under the action of softening enzyme, wherein the dosage of the softening enzyme is 1-2% of the weight of the raw hide, the softening temperature is 28-34 ℃, and the softening time is 20-30 min;

c. tanning: performing chrome tanning treatment on the softened pelts to obtain leather;

d. retanning;

e. rinsing: putting the retanned leather into a rotary drum, adding water according to the liquid ratio of 3-4g/ml by taking the weight of the leather as a base number, keeping the temperature in the rotary drum at 32-36 ℃, starting the rotary drum, adding 0.1-0.3% of formic acid which is diluted by 10-15 times of cold water in advance, and discharging liquid;

f. dyeing: dyeing the rinsed leather by a dyeing device;

g. fat liquoring;

h. water squeezing: squeezing the fatted leather by a squeezing device to uniformly squeeze out water;

i. and (3) vacuum drying: drying the leather after being squeezed with water by a vacuum drier until the water content is 40-46%;

j. naturally hanging and airing: naturally drying the leather after vacuum drying at 25-35 ℃ until the water content is 4-8%;

k. and (5) dampening, softening and coating to obtain the cow leather sofa leather with low VOC volatilization.

By adopting the method, the processing of the cow leather sofa leather with low VOC volatilization can be realized through the steps of unhairing, softening, tanning, retanning, rinsing, dyeing, greasing, wringing, vacuum drying, natural hanging and airing, dampening, softening and coating, the content of total organic volatile substances in the product is greatly reduced, and the product has good environmental protection property.

The raw hide in the step a is cattle hide or buffalo hide.

And e, the rotating drum rotation time in the step e is 40-60 min.

And f, dyeing at 25-45 ℃ for 30-50 min.

And the breaking time in the step k is 20-40 min.

The water squeezing device in the step h comprises a rack, a placing plate used for placing sofa leather is fixed to the middle of the rack through a connecting rod, a plurality of water through holes are formed in the placing plate, a lifting frame is arranged on the upper portion of the rack, the lifting frame is connected with a lifting mechanism capable of driving the lifting frame to move up and down, a first guide rod arranged horizontally is fixed to the lifting frame, a first guide sleeve is arranged on the first guide rod, the first guide sleeve is connected with a driving structure capable of driving the first guide rod to move back and forth, a mounting frame is fixed to the first guide sleeve, a water squeezing roller arranged horizontally is arranged on the mounting frame, the end portion of the water squeezing roller is connected with a power structure capable of driving the water squeezing roller to rotate, the water squeezing roller can be in contact with the placing plate, an air cylinder is fixed to the lower portion of the rack, a piston rod of the.

The working principle of the wringing device is as follows: put sofa leather on placing the board, the piston rod rebound of control cylinder, the piston rod of cylinder drives the basin rebound, make sofa leather on placing the board be located the basin, after sofa leather fully soaks, the piston rod rebound of control cylinder, the piston rod of cylinder drives the basin rebound, make the basin reset, drive the crane rebound through elevating system, the crane makes wringing roller rebound, wringing roller contacts with the sofa leather of placing on the board, drive the wringing roller through the power structure and rotate, and simultaneously, drive a guide pin bushing round trip movement through the drive structure, a guide pin bushing drives the mounting bracket round trip movement, the mounting bracket drives wringing roller round trip movement, wringing roller extrudees sofa leather, waste water drops in the basin, it is convenient to wring.

The driving structure comprises a first gear, a first rack and a first servo motor, the first rack is horizontally fixed on the lifting frame and is parallel to the first guide rod, the first servo motor is fixed on the first guide sleeve, an output shaft of the first servo motor is horizontally arranged, the first gear is fixed at the end part of the output shaft of the first servo motor and is meshed with the first rack.

When the first guide sleeve moves back and forth, the output shaft of the first servo motor is controlled to rotate, the output shaft of the first servo motor drives the first gear to rotate, and the first gear is gradually meshed with the first rack to enable the first guide sleeve to move back and forth along the first guide rod, so that the first guide sleeve can move back and forth.

The lifting mechanism comprises a mounting base plate, a second guide rod, a second guide sleeve, a second gear, a second rack and a second servo motor, the mounting base plate is vertically fixed to the upper portion of the rack, the second guide rod is vertically fixed to the mounting base plate, the second guide sleeve is arranged on the second guide rod, the second rack is vertically fixed to the mounting base plate, the second servo motor is fixed to the second guide sleeve, an output shaft of the second servo motor is horizontally arranged, the second gear is fixed to the end portion of the output shaft of the second servo motor, the second gear is meshed with the second rack, and the lifting frame is fixed to the.

When the lifting frame needs to move up and down, the output shaft of the second servo motor is controlled to rotate, the output shaft of the second servo motor drives the second gear to rotate, the second gear is gradually meshed with the second rack to enable the second guide sleeve to move up and down along the second guide rod, and the second guide sleeve drives the lifting frame to move up and down, so that the lifting frame can move up and down.

And the second guide rod is provided with scale marks.

By adopting the structure, the position of the second guide sleeve can be quickly known through the scale marks, and the indication is visual.

The power structure comprises a third servo motor, a driving wheel, a driven wheel and a transmission belt, the third servo motor is fixed on the mounting frame, an output shaft of the third servo motor is horizontally arranged, the driving wheel is fixed at the end part of the output shaft of the third servo motor, the driven wheel is fixed at the end part of the water squeezing roller, and the transmission belt is sleeved between the driving wheel and the driven wheel.

When the wringing roller needs to rotate, the output shaft of the third servo motor is controlled to rotate, the output shaft of the third servo motor drives the driving wheel to rotate, the driving wheel drives the driven wheel to rotate through the transmission belt, the driven wheel drives the wringing roller to rotate, and therefore the wringing roller rotates.

Still be provided with the edulcoration structure that is used for the water tank edulcoration in the frame, the edulcoration structure includes edulcoration case, outlet pipe and wet return, and the edulcoration case is fixed in the frame, and the one end and the outlet pipe one end of edulcoration case are linked together, and the outlet pipe other end and basin lower part are linked together, and the other end and the wet return one end of edulcoration case are linked together, and the wet return other end and basin upper portion are linked together, are provided with the circulating pump on the wet return, and the edulcoration incasement is provided with filter screen one.

By adopting the structure, the circulating pump is opened, water in the impurity removing tank is output to the impurity removing tank from the water outlet pipe, and is conveyed back to the impurity removing tank from the water return pipe after being filtered by the first filter screen, so that the circulating impurity removal can be realized, and the impurity removal is convenient.

The dyeing device in the step f comprises a base, a dye vat is fixed on the base, an opening is formed in the upper portion of the dye vat, a cylinder cover capable of sealing the opening is hinged to the dye vat, an ultrasonic transducer is arranged in the dye vat and connected with an ultrasonic generator through a circuit, a taking and placing mechanism for taking and placing sofa leather is arranged on the base and comprises a lifting table, a conveying belt, a material guide plate and a vibration motor I, the lifting table is arranged on the base and located on the side portion of the dye vat, the lifting table is connected with a lifting structure capable of driving the lifting table to move up and down, the conveying belt is arranged on the lifting table, one end of the material guide plate is hinged to the lifting table, the other end of the material guide plate is a material guide end, the material guide end can abut against the opening of the cylinder body, a plurality of through holes are further formed in the material guide plate, and the.

The working principle of the dyeing device is as follows: the sofa leather needing dyeing is placed on a conveying belt, a lifting platform is driven to move upwards through a lifting structure, the lifting platform drives the conveying belt to move upwards, the conveying belt is located above a dye vat, a material guide end of a material guide plate abuts against an opening of a cylinder body, the sofa leather is conveyed to the material guide plate through the conveying belt, the sofa leather falls into the dye vat under the action of self gravity, a sine signal is generated through an ultrasonic generator and is transmitted to an ultrasonic transducer, the ultrasonic transducer is converted into mechanical vibration, after the sofa leather is dyed, the lifting platform is driven to move downwards through the lifting structure, the lifting platform drives the conveying belt to move downwards, the conveying belt is located below the dye vat, the material guide end of the material guide plate abuts against the opening of the cylinder body, the dyed sofa leather is placed on the material guide plate, meanwhile, a vibration motor is controlled to vibrate the material guide plate, and the sofa leather falls into the conveying belt under the action of self gravity, the conveying belt outputs the sofa leather, so that the labor intensity can be greatly reduced, and the sofa leather is convenient to dye.

And anti-slip strips are fixed on the material guide ends of the material guide plate and made of rubber.

By adopting the structure, the friction force at the material guiding end of the material guiding plate can be increased through the anti-slip strips, and accidental slipping is avoided.

An auxiliary groove is further fixed on the base and located between the lifting platform and the dye vat, a second filter screen is arranged in the auxiliary groove, the bottom of the auxiliary groove is communicated with the upper portion of the dye vat through a recovery pipe, and a water pump is arranged on the recovery pipe.

By adopting the structure, the dye liquor which flows down from the guide plate can be collected through the auxiliary groove, and is conveyed back to the dye vat from the recovery pipe after being filtered by the second filter screen.

The lifting structure comprises a support frame, a first guide rail, a first sliding block, a third gear, a third rack and a first rotating motor, the support frame is fixed on the base, the first guide rail is vertically fixed on the support frame, the first sliding block is arranged on the first guide rail, the third rack is vertically fixed on the support frame, the first rotating motor is fixed on the first sliding block, an output shaft of the first rotating motor is horizontally arranged, the third gear is fixed at the end part of the output shaft of the first rotating motor, the third gear is meshed with the three phases of the rack, and the lifting platform is fixed on the first sliding.

When the lifting platform needs to move up and down, the output shaft of the first rotating motor is controlled to rotate, the output shaft of the first rotating motor drives the third gear to rotate, the third gear is gradually meshed with the third rack to enable the first sliding block to move up and down along the first guide rail, and the sliding block drives the lifting platform to move up and down, so that the lifting platform can move up and down.

The base is provided with a control assembly capable of controlling the action of a rotating motor, the control assembly comprises an installation rod, an upper detection block, a lower detection block, a travel switch and a controller I, the installation rod is vertically fixed on the base, the upper detection block and the lower detection block are sequentially fixed on the installation rod, the travel switch is connected with a first sliding block through a first spring, the travel switch can be respectively contacted with the upper detection block and the lower detection block, and the travel switch and the rotating motor I are all connected with the controller I through circuits.

Adopt this structure, the elevating platform detects it through last detection piece during rebound, detects it through detecting the piece down when the elevating platform rebound, detects it through detecting the piece down, detects the piece through travel switch and last detection piece or detect the piece down and contact, gives controller one with signal transmission, and controller one is steerable rotates motor action, and intelligent degree is high.

And a flow deflector is also fixed on the lower surface of the material guide plate and is close to the lifting platform.

By adopting the structure, the dye liquor on the stock guide plate can be guided through the flow guide sheet, so that the dye liquor can smoothly flow into the auxiliary tank.

The lower part of the dye vat is also provided with a discharge port for discharging waste liquid, and the discharge port is provided with a second electromagnetic valve.

The base is also provided with a treatment device which can treat the waste liquid in the dye vat, the treatment device comprises a treatment box, the treatment box is fixed on the base, the upper part of the treatment box is provided with a liquid inlet, the liquid inlet is communicated with a discharge port through a drain pipe, the lower part of the treatment box is provided with a liquid outlet, a microporous screen is arranged in the treatment box, the microporous screen divides the interior of the treatment box into an upper cavity and a lower cavity, the treatment box is also internally provided with a slag removing mechanism which can remove slag from the microporous screen, the slag removing mechanism comprises a mounting frame, a moving seat, a hairbrush strip, a lifting plate, a first push rod motor, a second vibrating motor, a mounting strip and a slag collecting groove, the mounting frame is fixed in the treatment box, the mounting frame is positioned in the upper cavity, the moving seat is arranged on the mounting frame, the moving seat is connected with a moving structure which can drive the moving seat to, the vertical downwards of push rod motor one, the push rod tip at push rod motor one is fixed to the brush strip, and the brush strip can contact with the micro mesh screen, push rod motor two is fixed on handling case upper portion through link two, the push rod of push rod motor two is vertical downwards, the push rod tip of push rod motor two passes and handles the roof wall and the lifter plate links to each other, the mounting bar passes through spring two and the lifter plate links to each other, and the mounting bar is the level and arranges, a plurality of clearance poles that are used for brush strip clearance have on the mounting bar, and the clearance pole is the level setting, vibrating motor two is fixed on the mounting bar, it fixes on the lifter plate to receive the sediment groove, and have the clearance that supplies the brush strip to pass through between receiving sediment groove and the clearance pole.

The waste liquid in the dye vat is conveyed into an upper cavity of the treatment box through a drainage pipe, slag in the waste water is filtered through a microporous screen, and the treated waste water flows into a lower cavity of the treatment box and is output from a liquid outlet, so that the treatment operation of the waste liquid is completed; the push rod of the push rod motor I is controlled to move downwards, the push rod of the push rod motor I drives the brush strip to move downwards, the brush strip is contacted with the microporous screen, the moving seat is driven to move back and forth by the moving structure, the moving seat drives the brush strip to move back and forth, the brush strip removes slag on the micro-sieve mesh, after the brush strip is stained with the slag, the push rod of the push rod motor I is controlled to move upwards, the push rod of the push rod motor I drives the brush strip to move upwards, the moving seat is driven by the moving structure to move towards the position close to the cleaning rod, the moving seat drives the brush strip to move towards the position close to the cleaning rod, the brush strip is contacted with the cleaning rod, the second vibration motor is controlled to work, the second vibration motor enables the cleaning rod to vibrate up and down, the cleaning rod shakes off slag on the brush strip, the slag falls into the slag collecting groove, thereby avoiding the blockage of the microporous screen and ensuring that the treatment box is always in a normal state and stable treatment.

The moving structure comprises a second guide rail, a second sliding block, a fourth gear, a fourth rack and a second rotating motor, the second guide rail is horizontally fixed on the mounting frame, the second sliding block is arranged on the second guide rail, the fourth rack is horizontally fixed on the mounting frame and is parallel to the second guide rail, the second rotating motor is fixed on the second sliding block, an output shaft of the second rotating motor is horizontally arranged, the fourth gear is fixed at the end part of an output shaft of the second rotating motor, the fourth gear is meshed with the fourth rack, and the moving seat is fixed on the second sliding block.

When the moving seat needs to move back and forth, the output shaft of the rotating motor II is controlled to rotate, the output shaft of the rotating motor II drives the gear IV to rotate, the gear IV and the rack IV are gradually meshed to enable the sliding block II to move back and forth along the guide rail II, and the sliding block II drives the moving seat to move back and forth, so that the moving seat can move back and forth.

And the upper part of the treatment box is provided with a slag taking hole which is positioned under the push rod motor II, and the treatment box is hinged with a cover plate capable of sealing the slag taking hole.

By adopting the structure, the slag in the slag collecting groove can be quickly taken out by opening the cover plate.

The material of the micro-porous screen is stainless steel.

The lower part of the slag collecting groove is also provided with a plurality of water through holes.

By adopting the structure, the waste water in the slag collecting groove can flow back to the upper cavity from the water through holes.

And a second controller is also fixed on the base, and the first push rod motor, the second vibration motor and the second rotation motor are all connected with the second controller through circuits.

By adopting the structure, the controller II can control the first push rod motor, the second vibration motor and the second rotation motor to act, and the intelligent degree is high.

Compared with the prior art, the processing method of the cow leather sofa leather with low VOC volatilization has the advantages that: according to the invention, the processing of the cow leather sofa leather with low VOC volatilization can be realized through the steps of unhairing, softening, tanning, retanning, rinsing, dyeing, fatliquoring, squeezing water, vacuum drying, natural hanging and airing, dampening, softening and coating, so that the content of total organic volatile substances in the product is greatly reduced, and the product is good in environmental protection.

Drawings

Fig. 1 is a schematic perspective view of a dyeing apparatus.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic plan view of the dyeing apparatus.

Fig. 4 is a schematic perspective view of a processing apparatus in the dyeing apparatus.

FIG. 5 is a schematic perspective view of a portion of the skin dyeing apparatus shown removed.

Fig. 6 is a schematic perspective view of the wringing device.

Fig. 7 is a partially enlarged view at B in fig. 6.

FIG. 8 is a schematic plane structure diagram of an impurity removing structure in the wringing device.

Fig. 9 is a schematic plan view of the power structure in the wringing device.

In the figure, 1, a base; 2. a lifting platform; 3. a material guide plate; 3a, a through hole; 4. an auxiliary groove; 5. an ultrasonic generator; 6. an ultrasonic transducer; 7. a dye vat; 7a, a discharge port; 8. a conveyor belt; 9. a first controller; 11. a lower detection block; 12. a travel switch; 13. a first spring; 14. a first sliding block; 15. rotating the first motor; 16. a third gear; 17. a third rack; 18. a support frame; 19. a first guide rail; 21. an upper detection block; 22. mounting a rod; 23. a second filter screen; 24. a water pump; 25. a recovery pipe; 26. anti-slip strips; 27. a first vibration motor; 28. a flow deflector; 29. a second electromagnetic valve; 32. a treatment tank; 32a, a liquid inlet; 32b, a liquid outlet; 33. a microporous screen; 34. a second controller; 35. a cover plate; 36. a push rod motor II; 37. a second connecting frame; 38. installing a frame; 39. a second guide rail; 41. a rack four; 42. a movable seat; 43. a fourth gear; 44. rotating a second motor; 45. a second sliding block; 46. a first connecting frame; 47. a push rod motor I; 48. a brush bar; 49. a lifting plate; 51. cleaning the rod; 52. mounting a bar; 53. a second spring; 54. a second vibration motor; 55. a slag collecting groove; 61. a frame; 62. a water tank; 63. placing the plate; 63a, a water through hole; 64. a mounting frame; 65. a water squeezing roller; 66. a mounting substrate; 67. a connecting rod; 68. a first guide rod; 69. a first guide sleeve; 71. a first gear; 72. a first servo motor; 73. a first rack; 74. a lifting frame; 75. a second rack; 76. a second gear; 77. a servo motor II; 78. a second guide sleeve; 79. a second guide rod; 81. a water outlet pipe; 82. a first electromagnetic valve; 83. an impurity removal box; 83a, a dirt cleaning port; 84. a first filter screen; 85. a circulation pump; 86. a water return pipe; 87. a cylinder; 88. a servo motor III; 89. a driven wheel; 91. a transmission belt; 92. a driving wheel.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The processing method of the cow leather sofa leather with low VOC volatilization comprises the following steps:

a. depilation: dehairing the raw skin one by one through a hair pushing machine; in the embodiment, the hair pusher adopts the existing equipment available on the market;

b. softening: softening the dehaired raw hide under the action of softening enzyme, wherein the dosage of the softening enzyme is 1-2% of the weight of the raw hide, the softening temperature is 28-34 ℃, and the softening time is 20-30 min; in this example, the dehaired skins were subjected to a bating treatment under the action of a bating enzyme, the amount of the bating enzyme was 1.5% of the weight of the skins, the bating temperature was 29 ℃, and the bating time was 24 min; the softening enzyme adopts the existing products which are available on the market;

d. retanning;

e. rinsing: putting the retanned leather into a rotary drum, adding water according to the liquid ratio of 3-4g/ml by taking the weight of the leather as a base number, keeping the temperature in the rotary drum at 32-36 ℃, starting the rotary drum, adding 0.1-0.3% of formic acid which is diluted by 10-15 times of cold water in advance, and discharging liquid; in this example, the retanned leather was put into a tumbler, water was added at a liquid ratio of 3.2g/ml based on the weight of the leather, the liquid ratio being the ratio of the weight of the leather to the volume of water, the temperature in the tumbler was kept at 34 ℃, the tumbler was started, 0.2% formic acid diluted in advance with 12 times of cold water was added, and the liquor was drained;

f. dyeing: dyeing the rinsed leather by a dyeing device;

g. fat liquoring;

i. and (3) vacuum drying: drying the leather after being squeezed with water by a vacuum drier until the water content is 40-46%; in this embodiment, the leather after being squeezed is dried by a vacuum dryer until the water content is 42%;

j. naturally hanging and airing: naturally drying the leather after vacuum drying at 25-35 ℃ until the water content is 4-8%; in this example, the leather after vacuum drying was naturally dried at 28 ℃ until the moisture content was 5%;

In this example, retanning and fatliquoring may be performed using the prior art in patent No. 2012101978188.

The hide in step a is buffalo hide or buffalo hide, in this example, the hide in step a is buffalo hide.

The drum rotation time in step e is 40-60min, in this embodiment, the drum rotation time in step e is 48 min.

The dyeing temperature in the step f is 25-45 ℃, and the dyeing time is 30-50min, in the embodiment, the dyeing temperature in the step f is 35 ℃, and the dyeing time is 40 min.

The milling time in the step k is 20-40min, and in the embodiment, the milling time in the step k is 30 min.

As shown in fig. 6-9, the wringing device in the step h comprises a frame 61, a placing plate 63 for placing sofa leather is fixed in the middle of the frame 61 through a connecting rod 67, a plurality of water through holes 63a are opened on the placing plate 63, and in the present embodiment, the number of the water through holes 63a is fifty; the upper part of the machine frame 61 is provided with a lifting frame 74, the lifting frame 74 is connected with a lifting mechanism capable of driving the lifting frame 74 to move up and down, a first guide rod 68 which is horizontally arranged is fixed on the lifting frame 74, and in the embodiment, the first guide rod 68 is fixed on the lifting frame 74 in a bolt connection mode; a first guide sleeve 69 is arranged on the first guide rod 68, the first guide sleeve 69 is connected with a driving structure capable of driving the first guide rod to move back and forth, a mounting frame 64 is fixed on the first guide sleeve 69, and in the embodiment, the mounting frame 64 is fixed on the first guide sleeve 69 in a welding mode; the mounting frame 64 is provided with a horizontally arranged wringing roller 65, the end part of the wringing roller 65 is connected with a power structure capable of driving the wringing roller to rotate, the wringing roller 65 can be contacted with the placing plate 63, the lower part of the rack 61 is fixed with an air cylinder 87, and in the embodiment, the lower part of the rack 61 is fixed with the air cylinder 87 in a bolt connection mode; the piston rod of the cylinder 87 is vertically upward, the end of the piston rod of the cylinder 87 is connected with the water tank 62, and in the embodiment, the end of the piston rod of the cylinder 87 is connected with the water tank 62 in a bolt connection mode; and the placing plate 63 can be located in the water tank 62.

The driving structure comprises a first gear 71, a first rack 73 and a first servo motor 72, wherein the first rack 73 is horizontally fixed on the lifting frame 74, and in the embodiment, the first rack 73 is fixed on the lifting frame 74 in a bolt connection mode; the rack I73 is parallel to the guide rod I68, and the servo motor I72 is fixed on the guide sleeve I69; an output shaft of the servo motor I72 is horizontally arranged, the gear I71 is fixed at the end part of the output shaft of the servo motor I72, and the gear I71 is meshed with the rack I73.

The lifting mechanism comprises a mounting base plate 66, a second guide rod 79, a second guide sleeve 78, a second gear 76, a second rack 75 and a second servo motor 77, the mounting base plate 66 is vertically fixed on the upper portion of the rack 61, and in the embodiment, the mounting base plate 66 is fixed on the upper portion of the rack 61 in a bolt connection mode; the second guide rod 79 is vertically fixed on the mounting substrate 66, and in the embodiment, the second guide rod 79 is fixed on the mounting substrate 66 in a bolt connection mode; the second guide sleeve 78 is arranged on the second guide rod 79, the second rack 75 is vertically fixed on the mounting base plate 66, and in the embodiment, the second rack 75 is fixed on the mounting base plate 66 in a bolt connection mode; the second servo motor 77 is fixed on the second guide sleeve 78, and in the embodiment, the second servo motor 77 is fixed on the second guide sleeve 78 in a bolt connection mode; an output shaft of the second servo motor 77 is horizontally arranged, the second gear 76 is fixed at the end part of the output shaft of the second servo motor 77, the second gear 76 is meshed with the second rack 75, and the lifting frame 74 is fixed on the second guide sleeve 78.

The second guide rod 79 is provided with scale marks; by adopting the structure, the position of the second guide sleeve 78 can be quickly known through the scale marks, and the indication is visual.

The power structure comprises a servo motor III 88, a driving wheel 92, a driven wheel 89 and a transmission belt 91, wherein the servo motor III 88 is fixed on the mounting frame 64, and in the embodiment, the servo motor III 88 is fixed on the mounting frame 64 in a bolt connection mode; the output shaft of the third servo motor 88 is horizontally arranged, the driving wheel 92 is fixed at the end part of the output shaft of the third servo motor 88, the driven wheel 89 is fixed at the end part of the wringing roller 65, and the transmission belt 91 is sleeved between the driving wheel 92 and the driven wheel 89.

The rack 61 is also provided with an impurity removing structure for removing impurities in the water tank, the impurity removing structure comprises an impurity removing tank 83, a water outlet pipe 81 and a water return pipe 86, the impurity removing tank 83 is fixed on the rack 61, and in the embodiment, the impurity removing tank 83 is fixed on the rack 61 in a bolt connection mode; one end of the impurity removing box 83 is communicated with one end of a water outlet pipe 81, the other end of the water outlet pipe 81 is communicated with the lower part of the water tank 62, the other end of the impurity removing box 83 is communicated with one end of a water return pipe 86, the other end of the water return pipe 86 is communicated with the upper part of the water tank 62, a circulating pump 85 is arranged on the water return pipe 86, a filter screen I84 is arranged in the impurity removing box 83, a dirt cleaning opening 83a is formed in the upper part of the impurity removing box 83, and a first; by adopting the structure, the circulating pump 85 is started, water in the impurity removing box 83 is output to the impurity removing box 83 from the water outlet pipe 81, after being filtered by the first filter screen 84, the water is conveyed back to the impurity removing box 83 from the water return pipe 86, so that the circulating impurity removal can be realized, and the impurity removal is convenient.

The working principle of the wringing device is as follows: the sofa leather is placed on the placing plate 63, the piston rod of the control cylinder 87 drives the water tank 62 to move upwards, the sofa leather on the placing plate 63 is located in the water tank 62, after the sofa leather is fully soaked in water, the piston rod of the control cylinder 87 drives the water tank 62 to move downwards, the water tank 62 is reset, the output shaft of the servo motor II 77 is controlled to drive the gear II 76 to rotate, the gear II 76 is gradually meshed with the rack II 75, the guide sleeve II 78 moves up and down along the guide rod II 79, the guide sleeve II 78 drives the lifting frame 74 to move up and down, the lifting frame 74 drives the water squeezing roller 65 to move downwards, the water squeezing roller 65 is contacted with the sofa leather on the placing plate 63, the output shaft of the servo motor III 88 is controlled to drive the driving wheel 92 to rotate, the driving wheel 92 drives the driven wheel 89 to rotate through the driving belt 91, the driven wheel 89 drives the, the first gear 71 is gradually meshed with the first rack 73, so that the first guide sleeve 69 moves back and forth along the first guide rod 68, the first guide sleeve 69 drives the mounting frame 64 to move back and forth, the mounting frame 64 drives the wringing roller 65 to move back and forth, the wringing roller 65 extrudes sofa leather, waste water drops into the water tank 62, and wringing is convenient.

As shown in fig. 1-5, the dyeing apparatus in step f includes a base 1, a dye vat 7 is fixed on the base 1, and in this embodiment, the dye vat 7 is fixed on the base 1 by welding; the upper part of the dye vat 7 is provided with an opening, a cylinder cover capable of sealing the opening is hinged on the dye vat 7, an ultrasonic transducer 6 is arranged in the dye vat 7, the ultrasonic transducer 6 is connected with an ultrasonic generator 5 through a circuit, in the embodiment, the ultrasonic transducer 6 and the ultrasonic generator 5 adopt the existing products available in the market, and the ultrasonic transducer 6 is connected with the ultrasonic generator 5 through the circuit and adopts the prior art; the sofa leather taking and placing mechanism is arranged on a base 1 and comprises a lifting platform 2, a conveying belt 8, a material guide plate 3 and a vibration motor I27, the lifting platform 2 is arranged on the base 1, the lifting platform 2 is positioned on the side part of a dye vat 7, the lifting platform 2 is connected with a lifting structure capable of driving the lifting platform to move up and down, the conveying belt 8 is arranged on the lifting platform 2, one end of the material guide plate 3 is hinged with the lifting platform 2, the other end of the material guide plate 3 is a material guide end, the material guide end can abut against an opening of a cylinder body, and a plurality of through holes 3a are further formed in the material guide plate 3; the first vibration motor 27 is fixed on the lower surface of the material guide plate 3, and in this embodiment, the first vibration motor 27 is fixed on the lower surface of the material guide plate 3 by means of bolts.

Anti-skid strips 26 are fixed on the material guiding end of the material guiding plate 3, and the anti-skid strips 26 are made of rubber; with the structure, the friction force at the material guiding end of the material guiding plate 3 can be increased through the anti-slip strips 26, and accidental slipping is avoided.

An auxiliary groove 4 is also fixed on the base 1, and in the embodiment, the auxiliary groove 4 is fixed on the base 1 through a support column; the auxiliary tank 4 is positioned between the lifting platform 2 and the dye vat 7, a second filter screen 23 is arranged in the auxiliary tank 4, the bottom of the auxiliary tank 4 is communicated with the upper part of the dye vat 7 through a recovery pipe 25, and a water pump 24 is arranged on the recovery pipe 25; by adopting the structure, the dye liquor which flows down from the guide plate 3 can be collected through the auxiliary groove 4, and is conveyed back to the dyeing vat 7 from the recovery pipe 25 after being filtered by the second filter screen 23.

The lifting structure comprises a support frame 18, a first guide rail 19, a first sliding block 14, a third gear 16, a third rack 17 and a first rotating motor 15, wherein the support frame 18 is fixed on the base 1, and in the embodiment, the support frame 18 is fixed on the base 1 in a bolt connection mode; the first guide rail 19 is vertically fixed on the support frame 18, and in the embodiment, the first guide rail 19 is fixed on the support frame 18 in a bolt connection mode; the first sliding block 14 is arranged on the first guide rail 19, and the third rack 17 is vertically fixed on the support frame 18, in the embodiment, the third rack 17 is fixed on the support frame 18 in a bolt connection mode; the first rotating motor 15 is fixed on the first sliding block 14, an output shaft of the first rotating motor 15 is horizontally arranged, the third gear 16 is fixed at the end part of the output shaft of the first rotating motor 15, the third gear 16 is meshed with the third rack 17, and the lifting platform 2 is fixed on the first sliding block 14.

The base 1 is provided with a control assembly capable of controlling the action of a first rotating motor 15, the control assembly comprises a mounting rod 22, an upper detection block 21, a lower detection block 11, a travel switch 12 and a first controller 9, the mounting rod 22 is vertically fixed on the base 1, and in the embodiment, the mounting rod 22 is fixed on the base 1 in a welding mode; the upper detection block 21 and the lower detection block 11 are sequentially fixed on the mounting rod 22, the travel switch 12 is connected with the first sliding block 14 through a first spring 13, the travel switch 12 can be respectively contacted with the upper detection block 21 and the lower detection block 11, the travel switch 12 and the first rotating motor 15 are both connected with the first controller 9 through circuits, in the embodiment, the first controller 9 adopts a commercially available single chip microcomputer, the program for controlling the travel switch and the motor by the single chip microcomputer is the existing one, and the program does not need to be edited again; adopt this structure, 2 lift platforms 2 detect it through last detection piece 21 during rebound, detect it through detecting piece 11 down when 2 lift platforms 2 rebound, contact through travel switch 12 and last detection piece 21 or lower detection piece 11, give controller 9 with signal transmission, the action of the steerable motor of rotating of controller 9, intelligent degree is high.

A flow deflector 28 is further fixed on the lower surface of the material guide plate 3, and in the embodiment, the flow deflector 28 is fixed on the lower surface of the material guide plate 3 in a bolt connection manner; and the guide vane 28 is close to the lifting platform 2; with this structure, the dye liquor on the guide plate 3 can be guided by the guide piece 28 and smoothly flows down into the auxiliary tank 4.

The lower part of the dye vat 7 is also provided with a discharge port 7a for discharging waste liquid, and a second electromagnetic valve 29 is arranged at the discharge port 7 a.

The base 1 is also provided with a treatment device capable of treating the waste liquid in the dye vat 7, the treatment device comprises a treatment box 32, the treatment box 32 is fixed on the base 1, in the embodiment, the treatment box 32 is fixed on the base 1 in a bolt connection mode; the upper part of the treatment box 32 is provided with a liquid inlet 32a, the liquid inlet 32a is communicated with the discharge port 7a through a drain pipe, the lower part of the treatment box 32 is provided with a liquid outlet 32b, a microporous screen 33 is arranged in the treatment box 32, the inside of the treatment box 32 is divided into an upper cavity and a lower cavity by the microporous screen 33, the treatment box 32 is also internally provided with a slag removing mechanism capable of removing slag from the microporous screen 33, the slag removing mechanism comprises a mounting frame 38, a moving seat 42, a brush strip 48, a lifting plate 49, a first push rod motor 47, a second push rod motor 36, a second vibration motor 54, a mounting bar 52 and a slag collecting groove 55, the mounting frame 38 is fixed in the treatment box 32, and in the embodiment, the mounting frame 38 is fixed in the treatment box 32 in a; the mounting frame 38 is located in the upper cavity, the moving seat 42 is arranged on the mounting frame 38, the moving seat 42 is connected with a moving structure capable of driving the moving seat to move back and forth, the push rod motor one 47 is fixed on the moving seat 42 through the connecting frame one 46, a push rod of the push rod motor one 47 is vertically downward, the brush strip 48 is fixed at the end part of the push rod motor one 47, and in the embodiment, the brush strip 48 is fixed at the end part of the push rod motor one 47 in a bolt connection manner; the brush strip 48 can contact with the microporous screen 33, the second push rod motor 36 is fixed on the upper part of the treatment box 32 through the second connecting frame 37, the push rod of the second push rod motor 36 is downward vertically, the end part of the push rod of the second push rod motor 36 penetrates through the top wall of the treatment box 32 and is connected with the lifting plate 49, and in the embodiment, the end part of the push rod of the second push rod motor 36 is connected with the lifting plate 49 in a bolt connection mode; the mounting bar 52 is connected with the lifting plate 49 through a second spring 53, the mounting bar 52 is horizontally arranged, a plurality of cleaning rods 51 for cleaning the brush strip 48 are arranged on the mounting bar 52, and in the embodiment, the number of the cleaning rods 51 is fifty; the cleaning rod 51 is horizontally arranged, the second vibration motor 54 is fixed on the mounting bar 52, and in the embodiment, the second vibration motor 54 is fixed on the mounting bar 52 in a bolt connection mode; the slag collecting groove 55 is fixed on the lifting plate 49, and a gap for the brush strip 48 to pass through is arranged between the slag collecting groove 55 and the cleaning rod 51.

The moving structure comprises a second guide rail 39, a second sliding block 45, a fourth gear 43, a fourth rack 41 and a second rotating motor 44, wherein the second guide rail 39 is horizontally fixed on the mounting frame 38, and in the embodiment, the second guide rail 39 is fixed on the mounting frame 38 in a bolt connection mode; the second sliding block 45 is arranged on the second guide rail 39, and the fourth rack 41 is horizontally fixed on the mounting frame 38, in the embodiment, the fourth rack 41 is fixed on the mounting frame 38 in a bolt connection mode; and the rack four 41 is parallel to the guide rail two 39, the rotating motor two 44 is fixed on the sliding block two 45, the output shaft of the rotating motor two 44 is horizontally arranged, the gear four 43 is fixed at the end part of the output shaft of the rotating motor two 44, the gear four 43 is meshed with the rack four 41, and the moving seat 42 is fixed on the sliding block two 45.

A slag taking port is formed in the upper part of the treatment box 32 and is positioned right below the second push rod motor 36, and a cover plate 35 capable of sealing the slag taking port is hinged to the treatment box 32; by adopting the structure, the cover plate 35 is opened, the slag collecting groove 55 is moved upwards through the second push rod motor 36, and slag in the slag collecting groove 55 is quickly taken out.

The material of the microscreen 33 is stainless steel.

The lower part of the slag collecting groove 55 is also provided with a plurality of water through holes, and in the embodiment, the number of the water through holes is six; by adopting the structure, the waste water in the slag collecting groove 55 can flow back to the upper cavity from the water through holes.

The second controller 34 is further fixed on the base 1, and the first push rod motor 47, the second push rod motor 36, the second vibration motor 54 and the second rotation motor 44 are all connected with the second controller 34 through circuits; by adopting the structure, the second controller 34 can control the first push rod motor 47, the second push rod motor 36, the second vibration motor 54 and the second rotation motor 44 to act, and the intelligent degree is high.

The working principle of the dyeing device is as follows: placing sofa leather to be dyed on a conveying belt 8, controlling an output shaft of a rotating motor I15 to drive a gear III 16 to rotate, gradually engaging the gear III 16 with a rack III 17 to enable a slide block I14 to move downwards along a guide rail I19, driving a lifting platform 2 to move downwards by the slide block I14, driving the conveying belt 8 to move upwards by the lifting platform 2, enabling the conveying belt 8 to be located above a dye vat 7, enabling a material guiding end of a material guiding plate 3 to abut against an opening of a cylinder body, conveying the sofa leather onto the material guiding plate 3 by the conveying belt 8, enabling the sofa leather to slide into the dye vat 7 under the action of self gravity, generating a sinusoidal signal through an ultrasonic generator 5, transmitting the sinusoidal signal to an ultrasonic transducer 6, converting the sinusoidal signal into mechanical vibration, controlling the output shaft of the rotating motor I15 to drive the gear III 16 to rotate after the sofa leather is dyed, gradually engaging the gear III 16 with the rack III 17 to enable the slide block I, the first slide block 14 drives the lifting platform 2 to move downwards, the lifting platform 2 drives the conveyer belt 8 to move downwards, the conveyer belt 8 is located below the dye vat 7, the material guiding end of the material guiding plate 3 is abutted against the opening of the cylinder body, the dyed sofa leather is placed on the material guiding plate 3, meanwhile, the first vibration motor 27 is controlled to vibrate the material guiding plate 3, the sofa leather slides down into the conveyer belt 8 under the action of self gravity, the conveyer belt 8 outputs the sofa leather, the labor intensity can be greatly reduced, and the dyeing is convenient;

the waste liquid in the dye vat is conveyed into the upper cavity of the treatment box 32 through the drainage pipe, the slag in the waste water is filtered through the microporous screen 33, and the treated waste water flows into the lower cavity of the treatment box 32 and is output from the liquid outlet 32b, so that the treatment operation of the waste liquid is completed; a push rod of a first push rod motor 47 is controlled to drive the brush strip 48 to move downwards, and the brush strip 48 is in contact with the micro-porous screen 33; an output shaft of a rotating motor II 44 is controlled to drive a gear II 43 to rotate, the gear II 43 is gradually meshed with a rack II 41, so that a sliding block II 45 moves back and forth along a guide rail II 39, the sliding block II 45 drives a moving seat 42 to move back and forth, the moving seat 42 drives a brush strip 48 to move back and forth, and the brush strip 48 removes slag on the microporous screen mesh 33; after the brush strip 48 is full of slag, a push rod of a first push rod motor 47 is controlled to drive the brush strip 48 to move upwards, an output shaft of a second rotating motor 44 is controlled to drive a fourth gear 43 to rotate, the fourth gear 43 and a fourth rack 41 are gradually meshed to enable a second sliding block 45 to move towards a position close to a cleaning rod 51 along a second guide rail 39, the second sliding block 45 drives a moving seat 42 to move towards the position close to the cleaning rod 51, the moving seat 42 drives the brush strip 48 towards the position close to the cleaning rod 51, the brush strip 48 is enabled to be in contact with the cleaning rod 51, a second vibrating motor 54 is controlled to enable the cleaning rod 51 to vibrate up and down, the cleaning rod 51 vibrates the slag on the brush strip 48, the slag drops into a slag collecting groove 55, and therefore blockage of the micro-pore screen 33 can be avoided, and the processing box 32 is ensured to be always in a normal.

Claims

1. The processing method of the cow leather sofa leather with low VOC volatilization is characterized by comprising the following steps:

d. retanning;

e. rinsing: putting the retanned leather into a rotary drum, and taking the weight of the leather as a base number, and adding the leather into the rotary drum according to a liquid ratio: adding 1ml of water into 3-4g of leather, keeping the temperature in the rotary drum at 32-36 ℃, starting the rotary drum, adding formic acid diluted by 10-15 times of cold water in advance, wherein the amount of the formic acid is 0.1-0.3 percent of the weight of the leather, and discharging liquid;

f. dyeing: the bleached leather is put on a conveying belt, a lifting platform is driven to move upwards through a lifting structure, the lifting platform drives the conveying belt to move upwards, the conveying belt is positioned above a dye vat, a material guide end of a material guide plate is abutted against an opening of the dye vat, the leather is conveyed to the material guide plate through the conveying belt, the leather slides down into the dye vat under the action of self gravity, a sine signal is generated through an ultrasonic generator and is transmitted to an ultrasonic transducer, the ultrasonic transducer is converted into mechanical vibration, after the leather is dyed, the lifting platform is driven to move downwards through the lifting structure, the conveying belt is driven to move downwards through the lifting platform, the conveying belt is positioned below the dye vat, the material guide end of the material guide plate is abutted against the opening of the dye vat, the dyed leather is put on the material guide plate, and meanwhile, the vibration motor is controlled to vibrate the material guide plate, the leather slides down into the conveying belt under, the leather is output by the conveyer belt; the dyeing device in the step f comprises a base, a dye vat is fixed on the base, an opening is formed in the upper portion of the dye vat, a cylinder cover capable of sealing the opening is hinged to the dye vat, an ultrasonic transducer is arranged in the dye vat and connected with an ultrasonic generator through a circuit, a taking and placing mechanism for taking and placing sofa leather is arranged on the base and comprises a lifting table, a conveying belt, a material guide plate and a vibration motor I, the lifting table is arranged on the base and located on the side portion of the dye vat, the lifting table is connected with a lifting structure capable of driving the lifting table to move up and down, the conveying belt is arranged on the lifting table, one end of the material guide plate is hinged to the lifting table, the other end of the material guide plate is a material guide end, the material guide end can abut against the opening of the cylinder body, a plurality of through holes are formed in the material guide plate, and the vibration; the lower part of the dye vat is also provided with a discharge port for discharging waste liquid, and the discharge port is provided with a second electromagnetic valve; the base is also provided with a treatment device which can treat the waste liquid in the dye vat, the treatment device comprises a treatment box, the treatment box is fixed on the base, the upper part of the treatment box is provided with a liquid inlet, the liquid inlet is communicated with a discharge port through a drain pipe, the lower part of the treatment box is provided with a liquid outlet, a microporous screen is arranged in the treatment box, the microporous screen divides the interior of the treatment box into an upper cavity and a lower cavity, the treatment box is also internally provided with a slag removing mechanism which can remove slag from the microporous screen, the slag removing mechanism comprises a mounting frame, a moving seat, a hairbrush strip, a lifting plate, a first push rod motor, a second vibrating motor, a mounting strip and a slag collecting groove, the mounting frame is fixed in the treatment box, the mounting frame is positioned in the upper cavity, the moving seat is arranged on the mounting frame, the moving seat is connected with a moving structure which can drive the moving seat to, the device comprises a push rod motor I, a push rod motor II, a vibrating motor II, a lifting plate, a spring II, a plurality of cleaning rods, a cleaning rod, a slag collecting groove and a clearance, wherein the push rod of the push rod motor I is vertically downward, the brush strip is fixed at the end part of the push rod motor I and can be contacted with the micro-porous screen;

g. fat liquoring;

h. water squeezing: putting the greased leather on a placing plate, controlling a cylinder to drive a water tank to move upwards to enable the sofa leather on the placing plate to be located in the water tank, controlling the cylinder to drive the water tank to move downwards to enable the water tank to reset after the sofa leather is fully soaked in water, driving a lifting frame to move downwards through a lifting mechanism, enabling a wringing roller to move downwards through the lifting frame, enabling the wringing roller to be in contact with the sofa leather on the placing plate, driving the wringing roller to rotate through a power structure, driving a guide sleeve I to move back and forth through a driving structure, driving a mounting frame to move back and forth through the guide sleeve I, driving the wringing roller to move back and forth through the mounting frame, and squeezing the sofa leather through the wringing roller to enable; the water squeezing device in the step h comprises a rack, a placing plate for placing sofa leather is fixed in the middle of the rack through a connecting rod, a plurality of water through holes are formed in the placing plate, a lifting frame is arranged on the upper portion of the rack and connected with a lifting mechanism capable of driving the lifting frame to move up and down, a first guide rod arranged horizontally is fixed on the lifting frame, a first guide sleeve is arranged on the first guide rod and connected with a driving structure capable of driving the first guide sleeve to move back and forth, an installation frame is fixed on the first guide sleeve, a water squeezing roller arranged horizontally is arranged on the installation frame, the end portion of the water squeezing roller is connected with a power structure capable of driving the water squeezing roller to rotate, the water squeezing roller can be in contact with the placing plate, an air cylinder is fixed on the lower portion of the rack, a piston rod of the air cylinder is vertically upward, the end portion of;

2. The method for processing cowhide sofa leather with low VOC volatilization as claimed in claim 1, wherein the raw hide in the step a is cowhide or buffalo hide.

3. The method for processing cowhide sofa leather with low VOC volatilization as claimed in claim 1, wherein the drum rotation time in the step e is 40-60 min.

4. The processing method of the cowhide sofa leather with low VOC volatilization as claimed in claim 1, wherein the driving structure comprises a first gear, a first rack and a first servo motor, the first rack is horizontally fixed on the lifting frame and is parallel to the first guide rod, the first servo motor is fixed on the first guide sleeve, an output shaft of the first servo motor is horizontally arranged, the first gear is fixed at the end part of the output shaft of the first servo motor, and the first gear is meshed with the first rack.

5. The processing method of the cowhide sofa leather with low VOC volatilization as claimed in claim 1, wherein the lifting mechanism comprises a mounting base plate, a second guide rod, a second guide sleeve, a second gear, a second rack and a second servo motor, the mounting base plate is vertically fixed on the upper portion of the rack, the second guide rod is vertically fixed on the mounting base plate, the second guide sleeve is arranged on the second guide rod, the second rack is vertically fixed on the mounting base plate, the second servo motor is fixed on the second guide sleeve, an output shaft of the second servo motor is horizontally arranged, the second gear is fixed at the end portion of the output shaft of the second servo motor, the second gear is meshed with the second rack, and the lifting frame is fixed on the second.

6. The method for processing the cowhide sofa leather with low VOC volatilization as claimed in claim 5, wherein the second guide rod is provided with scale marks.

7. The processing method of the cowhide sofa leather with low VOC volatilization as claimed in claim 1, wherein the power structure comprises a third servo motor, a driving wheel, a driven wheel and a transmission belt, the third servo motor is fixed on the mounting frame, an output shaft of the third servo motor is horizontally arranged, the driving wheel is fixed at the end part of the output shaft of the third servo motor, the driven wheel is fixed at the end part of the wringing roller, and the transmission belt is sleeved between the driving wheel and the driven wheel.