CN115821511B

CN115821511B - Waste heat recovery device of setting machine

Info

Publication number: CN115821511B
Application number: CN202211323623.3A
Authority: CN
Inventors: 周均良
Original assignee: Zhuji Xinbang Textile Co ltd
Current assignee: Zhuji Xinbang Textile Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-06-20
Anticipated expiration: 2042-10-27
Also published as: CN115821511A

Abstract

The invention discloses a waste heat recovery device of a setting machine, which is characterized in that: including design machine case and heat exchange box, design machine case left and right sides is provided with cloth outlet and cloth inlet respectively, design machine incasement portion is provided with a plurality of guide rolls, design machine case below is provided with the hot-blast main, be provided with the baffle between design machine case and the hot-blast main, a plurality of fresh air inlets have been seted up to the baffle, design machine case upper portion is provided with steam discharge port and stoving steam discharge port, heat exchange box left and right sides is connected with stoving steam import and stoving steam export respectively, the front and back side of heat exchange box is in natural wind import and heat exchange gas export respectively, stoving steam import is connected with stoving steam discharge port, heat exchange gas export is connected with the hot-blast main, heat exchange box left and right sides all is provided with the mounting panel, be connected with the heat exchange tube between the mounting panel of both sides. According to the invention, the heat of the drying hot gas of the setting machine is recycled and is exchanged with natural wind, so that the cost is reduced.

Description

Waste heat recovery device of setting machine

Technical Field

The invention relates to the technical field of setting machines, in particular to a waste heat recovery device of a setting machine.

Background

In recent years, with the rapid expansion of the production capacity of printing and dyeing enterprises, the number of newly increased setting machines is increased dramatically, and environmental complaints and pollution disputes caused by the waste heat emission of the setting machines are increased increasingly. The heat setting machine is a device for drying, finishing and setting fabrics by using hot air, and the waste heat recovery of the setting machine is a multi-benefit project, and the project can generate remarkable economic and social benefits in the aspects of energy conservation, consumption reduction, environmental protection, quality improvement of the set fabrics, workshop environment improvement and the like. The existing waste heat recovery application measures are improper, so that the energy saving and emission reduction effects are not ideal.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a waste heat recovery device of a setting machine.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the utility model provides a forming machine waste heat recovery device, including forming machine case and heat exchange box, forming machine case left and right sides is provided with cloth outlet and cloth inlet respectively, forming machine incasement portion is provided with a plurality of guide rolls, forming machine case below is provided with the hot-blast main, be provided with the baffle between forming machine case and the hot-blast main, a plurality of fresh air inlets have been seted up to the baffle, forming machine case upper portion is provided with steam outlet and stoving steam discharge port, heat exchange box left and right sides is connected with stoving steam inlet and stoving steam outlet respectively, the front and back side of heat exchange box is provided with natural wind inlet and heat exchange gas outlet respectively, stoving steam inlet is connected with stoving steam discharge port, heat exchange gas outlet and hot-blast main are connected, heat exchange box left and right sides all is provided with the mounting panel, be connected with the heat exchange tube between the mounting panel of both sides, the heat exchange tube outside is provided with the fin.

Preferably, a diversion cavity is arranged between the natural wind inlet and the heat exchange gas outlet, and a plurality of diversion plates are arranged in the diversion cavity.

Preferably, a transverse moving sliding hole is formed in the partition plate, a sliding plate and an adjusting cylinder are arranged in the sliding hole, a piston rod of the adjusting cylinder is connected with the right side face of the sliding plate, and a plurality of through holes are formed in the sliding plate.

Preferably, a filter box is arranged between the drying hot gas discharge port and the drying hot gas inlet, a plurality of filter plates are arranged in the filter box, a plurality of air inlet pipes are arranged on the filter box, the upper ends of the air inlet pipes penetrate out of the filter box and are connected with an air speed detector, and the air inlet pipes are positioned at the air inlet and the air outlet of the filter box and between the two adjacent filter plates.

Preferably, a traversing mechanism is arranged below the filter box, and a cleaning mechanism is arranged on the traversing mechanism.

Preferably, the transverse moving mechanism comprises a first guide rail and a second guide rail which are arranged in parallel, a first lead screw sliding block and a movable block are respectively arranged on the first guide rail and the second guide rail in a sliding manner, a connecting rod is connected between the second guide rail and the first guide rail, a first lead screw motor is arranged on the first guide rail, a first lead screw sliding block is connected with a first lead screw in a driving manner, the first lead screw sliding block is arranged on the first lead screw, the cleaning mechanism comprises a cleaning box and a blocking cover which are arranged between the first lead screw sliding block and the movable block in a sliding manner, a flushing pipe is arranged in the cleaning box, a water pump is connected to the lower portion of the flushing pipe, a plurality of spray heads are arranged on the left side of the flushing pipe, a plurality of cleaning rollers are arranged at the position, located on the left side of the flushing pipe, of the first lead screw sliding block, a second lead screw motor is fixedly arranged on the first lead screw sliding block, a second lead screw motor is connected to the cleaning box, a fan and a heating pipe is arranged in an opening of the blocking cover, the cleaning box is located at the left side of the fan, a plurality of lifting cylinders are arranged between the first lead screw sliding block and the movable block, and the lifting cylinders are connected to the upper ends of piston rods of lifting cylinders.

Preferably, a support column is connected to the lower portion of the screw rod sliding block, a support plate is connected to the lower portion of the support column, and the lower ends of the screw rod II and the screw rod III are rotatably arranged on the support plate.

Compared with the prior art, the invention has the beneficial effects that: the dried hot gas enters the heat exchange tube from the dried hot gas inlet and exchanges heat with natural wind entering the heat exchange box through the natural wind inlet. The natural wind temperature after heat exchange is increased to 90 to 100 ℃, then the natural wind enters a compression fan for compression, the temperature is increased to 130 to 150 ℃, and the gases are conveyed to a hot air pipe for drying, so that the waste heat utilization is achieved. The power consumption can be effectively reduced, thereby saving the cost.

Drawings

FIG. 1 is a schematic diagram of a setting machine according to the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is a schematic view of the heat exchange box according to the present invention;

FIG. 4 is a schematic view of the structure of the filter box of the present invention;

FIG. 5 is a schematic view showing the internal structure of the filter box according to the present invention;

FIG. 6 is a schematic view of the traversing mechanism and cleaning mechanism of the present invention;

FIG. 7 is a top view of a traversing mechanism and cleaning mechanism according to the present invention;

FIG. 8 is a schematic view of the installation of a filter plate according to the present invention;

FIG. 9 is an enlarged schematic view of FIG. 8 at A;

fig. 10 is an enlarged schematic view at B in fig. 8.

Reference numerals: 1. shaping a case; 2. a cloth inlet; 3. a cloth outlet; 4. a hot air pipe; 5. a guide roller; 6. a water vapor outlet; 7. a drying hot gas discharge port; 8. a heat exchange box; 9. a drying hot gas inlet; 10. a drying hot gas outlet; 11. a mounting plate; 12. a heat exchange tube; 13. a fin; 14. a natural wind inlet; 15. a heat exchange gas outlet; 16. a shunt cavity; 17. a filter box; 18. a filter plate; 19. a wind speed detector; 20. an air inlet pipe; 21. a traversing mechanism; 22. a cleaning mechanism; 23. a partition plate; 24. an air inlet hole; 25. a sliding hole; 26. adjusting a cylinder; 27. a sliding plate; 28. a through hole; 29. a first guide rail; 30. a screw rod sliding block I; 31. a screw motor I; 32. a first screw rod; 33. a cleaning box; 34. a flushing pipe; 35. a spray head; 36. a cleaning roller; 37. a screw motor II; 38. a second screw rod; 39. a screw rod sliding block II; 40. a support column; 41. a support plate; 42. a shield; 43. a blower; 44. heating pipes; 45. a screw motor III; 46. a screw rod III; 47. a screw rod sliding block III; 48. a mounting block; 49. lifting a cylinder; 50. a lifting plate; 51. a second guide rail; 52. a movable block; 53. a connecting rod; 54. a movable groove; 55. a cross plate; 56. an abutment block; 57. a rotating seat; 58. a rotating plate; 59. a first spring; 60. a connecting plate; 61. a second spring; 62. a buffer plate; 63. a trigger block; 64. a third spring; 65. a trigger seat; 66. a speed reducing plate; 67. a spring IV; 68. a splitter plate.

Detailed Description

Embodiments of the present invention are described in detail below with reference to fig. 1-10.

The utility model provides a forming machine waste heat recovery device, including forming machine case 1 and heat exchange box 8, forming machine case 1 left and right sides is provided with cloth outlet 3 and cloth inlet 2 respectively, forming machine case 1 inside is provided with a plurality of guide rolls 5, guide roll 5 will follow cloth of cloth inlet 2 feeding and guide to cloth outlet 3 departments, forming machine case 1 below is provided with hot-blast main 4, be provided with baffle 23 between forming machine case 1 and the hot-blast main 4, a plurality of inlet openings 24 of vertical setting have been seted up to baffle 23, inlet opening 24 intercommunication forming machine case 1 and hot-blast main 4.

The pipe diameter of the hot air pipe 4 is gradually reduced from left to right, the pipe diameter is reduced to increase the pressure, the wind speed is increased, the speed of hot air blown into the shaping machine case 1 from the hot air pipe 4 is kept consistent, the water vapor discharge port 6 and the drying hot air discharge port 7 are arranged on the upper portion of the shaping machine case 1, the gas-liquid flow dividing mechanism is arranged in the shaping machine case 1 to separate the drying hot air, liquid is discharged from the water vapor discharge port 6, and gas is discharged from the drying hot air discharge port 7.

The left and right sides of the heat exchange box 8 are respectively connected with a drying hot gas inlet 9 and a drying hot gas outlet 10, the front side and the rear side of the heat exchange box 8 are respectively provided with a natural wind inlet 14 and a heat exchange gas outlet 15, the drying hot gas inlet 9 is connected with a drying hot gas discharge port 7 through a heat insulation pipeline, the heat exchange gas outlet 15 is connected with a hot air pipe 4 through a heat insulation pipeline, the left side and the right side of the heat exchange box 8 are respectively provided with a mounting plate 11, a heat exchange pipe 12 is connected between the mounting plates 11 on the two sides, and fins 13 are arranged on the outer side of the heat exchange pipe 12.

The hot air enters the shaping machine case 1 from the hot air pipe 4, the cloth in the shaping machine case 1 is dried and shaped, and the dried air is discharged from the drying hot air discharge port 7. The dried hot gas enters the heat exchange tube 12 from the dried hot gas inlet 9 and exchanges heat with natural wind entering the heat exchange box 8 through the natural wind inlet 14. The natural wind temperature after heat exchange is increased to 90 to 100 ℃, then the natural wind enters a compression fan for compression, the temperature is increased to 130 to 150 ℃, and the gases are conveyed to a hot air pipe 4 for drying, so that the waste heat utilization is achieved.

Preferably, a flow dividing cavity 16 is arranged between the natural wind inlet 14 and the heat exchange gas outlet 15, a plurality of flow dividing plates 68 are arranged in the flow dividing cavity 16, flow passages are formed by dividing the inside of the flow dividing cavity 16 through the flow dividing plates 68, and natural wind entering the flow dividing cavity 16 advances along each flow passage, so that the natural wind enters all positions in the heat exchange box 8 and can be fully contacted with the heat exchange tubes 12 to exchange heat, and the heat exchange efficiency is improved.

Preferably, a movable sliding hole 25 is formed in the partition plate 23, a sliding plate 27 and an adjusting cylinder 26 are arranged in the sliding hole 25, a piston rod of the adjusting cylinder 26 is connected with the right side surface of the sliding plate 27, and a plurality of through holes 28 are formed in the sliding plate 27. The air inlet quantity can be adjusted by adjusting the relative position between the through hole 28 and the air inlet 24 through controlling the sliding plate 27 to move left and right in the sliding hole 25 by the adjusting air cylinder 26, so as to meet different processing requirements.

Preferably, a filter box 17 is arranged between the drying hot gas discharge port 7 and the drying hot gas inlet 9, a plurality of filter plates 18 are arranged in the filter box 17, a plurality of air inlet pipes 20 are arranged on the filter box 17, the upper ends of the air inlet pipes 20 penetrate out of the filter box 17 and are connected with an air speed detector 19, and the air inlet pipes 20 are positioned at the air inlet and the air outlet of the filter box 17 and between two adjacent filter plates 18. The hot, dried gas is filtered through a filter plate 18 to remove fibrous impurities therefrom. The air speed detector 19 and the air inlet pipe 20 are used for detecting the air speed of each part in the filter box 17, and the speed difference of the drying hot air when passing through the filter plate 18 is monitored, so that the cleanliness of the filter plate 18 is judged. When the velocity difference of the drying hot air passing through the filter plate 18 reaches a specified value, the excessive impurities filtered on the filter plate 18 are indicated to be cleaned, so that a signal is sent to remind workers. The operator pulls the filter plate 18 out from under the filter box 17 for cleaning.

Preferably, a traversing mechanism 21 is arranged below the filter box 17, and a cleaning mechanism 22 is arranged on the traversing mechanism 21. The cleaning mechanism 22 is driven by the traversing mechanism 21 to move below the filter plate 18 to be cleaned, so that the filter plate 18 is cleaned by the cleaning mechanism 22.

Preferably, the traversing mechanism 21 comprises a first guide rail 29 and a second guide rail 51 which are arranged in parallel, a first lead screw sliding block 30 and a movable block 52 are respectively arranged on the first guide rail 29 and the second guide rail 51 in a sliding manner, a connecting rod 53 is connected between the second guide rail 51 and the first guide rail 29, a first lead screw motor 31 is arranged on the first guide rail 29, a first lead screw 32 is connected to the first lead screw motor 31 in a driving manner, the first lead screw sliding block 30 is arranged on the first lead screw 32, the cleaning mechanism 22 comprises a cleaning box 33 and a retaining cover 42 which are arranged between the first lead screw sliding block 30 and the movable block 52 in a sliding manner, a flushing pipe 34 is arranged in the cleaning box 33, a water pump is connected to the lower portion of the flushing pipe 34, a plurality of spray heads 35 are arranged on the left side of the flushing pipe 34, a plurality of cleaning rollers 36 are arranged at the position on the left side of the flushing box 33, a plurality of cleaning rollers 36 are arranged from top to bottom, a second lead screw motor 37 is fixedly arranged on the first lead screw sliding block 30, a second lead screw 38 is connected to the second lead screw motor 38 in a driving manner, the second lead screw sliding block 39 is arranged on the second lead screw sliding block 39 is connected with the cleaning box 33, the retaining cover 42 is arranged on the left side of the cleaning box 33, an opening of the retaining cover 42 is provided with a blower cylinder 43, a plurality of air cylinders 48 are arranged on the left side of the lifting blocks 48, a plurality of air cylinders 48 are arranged on the lifting blocks 48, and a lifting block 48 are arranged on the lifting block 48, and a lifting block 48 is arranged between the lifting block 48 and a lifting block 48 is arranged on the lifting end of the lifting block 48.

The first screw motor 31 drives the first screw 32 to rotate to drive the first screw slider 30 to move left and right, so that the cleaning mechanism 22 is moved below the filter plate 18 to be cleaned. During cleaning, the cleaning tank 33 is aligned with the filter plate 18 exposed below the filter tank 17, the second screw motor 37 drives the second screw 38 to rotate, so that the second screw slider 39 drives the cleaning tank 33 to ascend, the filter plate 18 enters the cleaning tank 33, the water pump pumps water into the flushing pipe 34 and then discharges the water from the spray head 35, the filter plate 18 is backwashed, and fiber impurities adhered on the filter plate 18 are flushed down. The cleaning roller 36 then brushes the filter plate 18 to brush down the fibrous impurities. The cleaning tank 33 is lowered to the original position, and the first screw motor 31 drives the first screw 32 to rotate to adjust the position of the first screw slider 30 so that the blocking cover 42 reaches below the filter plate 18. The third screw motor 45 drives the third screw 46 to rotate and drives the blocking cover 42 to ascend through the third screw sliding block 47. The heating pipe 44 heats the surrounding air, the fan 43 blows the hot air to the filter plate 18 again, the cleaned filter plate 18 is dried to remove the moisture on the filter plate 18, and the fiber impurities on the filter plate 18 can be blown down. After drying, the lifting cylinder 49 controls the piston rod to lift, and the lifting plate 50 drives the filter plate 18 to lift so that the filter plate 18 returns to the filter box 17.

Preferably, the lower part of the first screw slider 30 is connected with a support column 40, the lower part of the support column 40 is connected with a support plate 41, the lower ends of the second screw 38 and the third screw 46 are rotatably arranged on the support plate 41, and the lower ends of the second screw 38 and the third screw 46 are supported by the support plate 41 so as not to shake when rotating.

Preferably, the inner sides of the front wall and the rear wall of the filter box 17 are provided with movable grooves 54, the movable grooves 54 are arranged corresponding to the side positions of the filter plates 18, the side surfaces of the filter plates 18 are connected with transverse plates 55, the outer sides of the transverse plates 55 are connected with abutting blocks 56, the abutting blocks 56 incline outwards and downwards, rotating seats 57 are arranged on the inner sides of the movable grooves 54, rotating plates 58 are rotatably arranged on the rotating seats 57, the lower parts of the rotating plates 58 are connected with springs I59, the lower parts of the springs I59 are connected with connecting plates 60, the lower parts of the connecting plates 60 are connected with springs II 61, and the lower parts of the springs II 61 are connected with the inner sides of the movable grooves 54. Wherein the stiffness of the second spring 61 is greater than the stiffness of the first spring 59.

The lower portion of the abutting block 56 abuts against the rotating plate 58, and the rotating plate 58 supports the abutting block 56 so that the filter plate 18 is positioned in the filter box 17. As the filter plate 18 filters the hot drying gas for a longer period of time, the filter plate 18 becomes increasingly weighted by adhering fibers. When the weight is within a certain range, the second spring 61 cannot be pressed to deform, the rotating plate 58 always maintains the support for the abutment block 56, and the filter plate 18 is maintained in the filter box 17. When the weight of the filter plate 18 exceeds a certain value, the second spring 61 is started to compress, the rotating plate 58 is rotated downward, and the abutting block 56 slides off the rotating plate 58, so that the filter plate 18 falls out of the filter box 17, and cleaning is started.

After the filter plate 18 has been cleaned, the filter plate 18 is pushed down and lifted back into the filter box 17. When the abutting block 56 rises to contact the rotating plate 58, the rotating plate 58 is driven to rotate upwards, and the rotating plate 58 only stretches the first spring 59. With the continued lifting of the abutment block 56, after the rotation plate 58 is rotated to a certain angle, the abutment block 56 passes through the rotation plate 58 to reach above the rotation plate 58, and the first spring 59 pulls the rotation plate 58 to return to the original position. Lifting of the filter plate 18 is stopped, and the filter plate 18 is lowered by a certain distance by gravity so that the abutment block 56 abuts against the rotation plate 58, thereby supporting the abutment block 56 by the rotation plate 58. Two springs of different stiffness, spring two 61 and spring one 59, are provided to respectively extend and compress as the filter plate 18 is raised and lowered.

Preferably, a trigger seat 65 is arranged at the bottom of the movable groove 54, a buffer plate 62 is arranged above the trigger seat 65, a trigger block 63 is arranged at the lower part of the buffer plate 62, and a third spring 64 is connected between the lower part of the buffer plate 62 and the bottom of the movable groove 54. As the filter plate 18 descends, the abutment block 56 contacts the buffer plate 62, and the buffer effect is achieved by the elastic force of the third spring 64, thereby slowing down the descent speed of the filter plate 18. The buffer plate 62 is depressed so that the trigger block 63 contacts the underlying trigger seat 65, indicating that the filter plate 18 has been exposed from beneath the filter box 17 for cleaning, and the trigger seat 65 signals the traversing mechanism 21 and cleaning mechanism 22 for subsequent cleaning.

The movable groove 54 is internally provided with a plurality of reduction plates 66 in a rotating way, the upper part and the lower part of the reduction plates 66 are connected with four springs 67, and the other ends of the four springs 67 are connected with the side walls of the movable groove 54. The descending cross plate 55 is blocked by the speed reducing plate 66 to reduce the speed of the filter plate 18 in the descending process, so that the filter plate 18 is prevented from descending too fast.

A control mechanism such as a singlechip is arranged, and the singlechip is connected with the wind speed detector 19, the traversing mechanism 21 and the cleaning mechanism 22 to control the operation of the wind speed detector.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims

1. The utility model provides a forming machine waste heat recovery device which characterized in that: the hot air drying machine comprises a shaping machine case and a heat exchange box, wherein a cloth outlet and a cloth inlet are respectively arranged on the left side and the right side of the shaping machine case, a plurality of guide rollers are arranged in the shaping machine case, a hot air pipe is arranged below the shaping machine case, a partition plate is arranged between the shaping machine case and the hot air pipe, a plurality of air inlet holes are formed in the partition plate, a water vapor outlet and a drying hot air discharge port are formed in the upper portion of the shaping machine case, a drying hot air inlet and a drying hot air outlet are respectively connected on the left side and the right side of the heat exchange box, a natural air inlet and a heat exchange air outlet are respectively arranged on the front side and the rear side of the heat exchange box, the drying hot air inlet is connected with the drying hot air discharge port, a mounting plate is arranged on the left side and the right side of the heat exchange box, a heat exchange pipe is connected between the mounting plates on the two sides, and fins are arranged on the outer side of the heat exchange pipe;

a filter box is arranged between the drying hot gas discharge port and the drying hot gas inlet, a plurality of filter plates are arranged in the filter box, a plurality of air inlet pipes are arranged on the filter box, the upper ends of the air inlet pipes penetrate out of the filter box and are connected with an air speed detector, and the air inlet pipes are positioned at the air inlet and the air outlet of the filter box and between two adjacent filter plates;

a traversing mechanism is arranged below the filter box, and a cleaning mechanism is arranged on the traversing mechanism;

the transverse moving mechanism comprises a first guide rail and a second guide rail which are arranged in parallel, a first lead screw sliding block and a movable block are respectively arranged on the first guide rail and the second guide rail in a sliding manner, a connecting rod is connected between the second guide rail and the first guide rail, a first lead screw motor is arranged on the first guide rail, a first lead screw sliding block is connected with a first lead screw in a driving manner, the first lead screw sliding block is arranged on the first lead screw, the cleaning mechanism comprises a cleaning box and a retaining cover which are arranged between the first lead screw sliding block and the movable block in a sliding manner, a flushing pipe is arranged in the cleaning box, a water pump is connected to the lower part of the flushing pipe, a plurality of spray heads are arranged on the left side of the flushing pipe, a plurality of cleaning rollers are arranged at the position, which is positioned on the left side of the flushing pipe, of the first lead screw sliding block, a second lead screw motor is fixedly arranged on the first lead screw sliding block, a second lead screw motor is connected with the second lead screw sliding block, a fan and a heating pipe is arranged in an opening of the retaining cover, the heating pipe is positioned on the left side of the fan, a plurality of mounting blocks are fixedly arranged between the first lead screw sliding block and the movable block, and a lifting plate is connected to the upper end of a piston rod of the lifting cylinder;

the inboard of wall has been seted up the movable groove around the rose box, the side position that the movable groove corresponds the filter sets up, the side of filter is connected with the diaphragm, the diaphragm outside is connected with the butt piece, the butt piece is outside downward sloping, the movable groove inboard is provided with rotates the seat, rotate on the seat and be provided with the rotor plate, rotor plate lower part is connected with spring one, spring one lower part is connected with the connecting plate, connecting plate lower part is connected with spring two, spring two lower part is connected with the movable groove inboard.

2. The heat recovery device of a setting machine according to claim 1, wherein: a diversion cavity is arranged between the natural wind inlet and the heat exchange gas outlet, and a plurality of diversion plates are arranged in the diversion cavity.

3. The heat recovery device of a setting machine according to claim 1, wherein: a transverse movable sliding hole is formed in the partition plate, a sliding plate and an adjusting cylinder are arranged in the sliding hole, a piston rod of the adjusting cylinder is connected with the right side face of the sliding plate, and a plurality of through holes are formed in the sliding plate.

4. The heat recovery device of a setting machine according to claim 1, wherein: the lower part of the screw rod sliding block is connected with a supporting column, the lower part of the supporting column is connected with a supporting plate, and the lower ends of the screw rod II and the screw rod III are rotationally arranged on the supporting plate.