Method and equipment for processing filter cloth special for phosphoric acid dihydrate

Abstract

The invention discloses a method and equipment for processing filter cloth special for phosphoric acid dihydrate, and relates to the technical field of filter cloth processing.The method comprises the post-processing procedures of yarn selection, yarn spinning, filter cloth tentering and the like and packaging, the used tentering equipment comprises a base, and two parallel installation boxes are installed at the upper end of the base; a second fixing frame is mounted at the upper end of the base on the side, away from the guide cloth feeding assembly, of the mounting box, the end, away from the mounting box, of the second fixing frame inclines to the side, away from the center position of the base, and a tentering mechanism is mounted at the upper end of the base between the mounting box and the second fixing frame; and luffing mechanisms are arranged on the second fixing frame and the first fixing frame. The second moving block, the third rotating rod and the third chain wheel are driven to move through the screw rod, and the tension spring assists the elastic movement of the first moving block, the second rotating rod and the second chain wheel, so that the tentering width of the filter cloth is changed, and the application range of the equipment is widened.

Description

Technical Field

[0001] The invention relates to the technical field of filter cloth processing, in particular to a processing method and equipment for filter cloth special for dihydrate phosphoric acid. Background Art

[0002] In the production of dihydrate phosphoric acid, filter cloth is mainly used to separate dihydrate gypsum from phosphoric acid slurry. The selected filter cloth should have high strength and good chemical stability, and be able to withstand high temperature and corrosion, so as to ensure its stability and durability during the production process.

[0003] When processing and producing the filter cloth specially used for dihydrate phosphoric acid, the filter cloth needs to be stretched. The stretching width of the existing stretching equipment is fixed and cannot be adaptively adjusted for filter cloths with different stretching widths.

[0004] The existing stretching and shaping device for filter cloth production with announcement number CN114753077B adjusts the angle between the two bases through a driving component so that the distance between the two bases near one end of the unloading mechanism is greater than the distance between the two bases near one end of the loading mechanism. The filter cloth can be stretched wider during movement, the stretching width of the filter cloth can be adjusted, and filter cloths of different specifications can be produced.

[0005] However, the above patent still has some shortcomings. Since the angles of the two bases are changed, although the width of the stretching is changed, the stretching speed is also changed. At the same distance, the stretching speed becomes faster or slower. The faster speed can easily cause the filter cloth to be pulled quickly and damaged, while the slower speed will lead to a decrease in the stretching efficiency, affecting the processing and production of the filter cloth.

[0006] In view of the above problems, an improved method and equipment for processing filter cloth for dihydrate phosphoric acid is now designed. Summary of the invention

[0007] The object of the present invention is to provide a method and equipment for processing a filter cloth specially used for dihydrate phosphoric acid, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The method for processing a special filter cloth for dihydrate phosphoric acid comprises the following steps:

[0010] Step 1: The yarn selected should have properties such as abrasion resistance, corrosion resistance and high temperature resistance, so that it can filter phosphoric acid dihydrate.

[0011] Step 2: The yarn selected in step 1 is woven by a loom to form an initial filter cloth. During weaving, attention should be paid to the tension and density of the filter cloth to facilitate filtering of dihydrate phosphoric acid.

[0012] Step 3: Use a stretching device to stretch, heat and shape the filter cloth produced in step 2, and then perform processes such as calendering, cutting, reeding and gluing on the stretched filter cloth to finally make a finished filter cloth.

[0013] Step 4: Use special packaging paper tubes to seal the finished filter cloth in multiple layers.

[0014] A stretching device for processing filter cloth, comprising a base, two mutually parallel installation boxes are installed on the upper end of the base, a guide cloth feeding assembly for guiding and conveying the filter cloth is installed on the upper end of the base at one end of the installation box, a second fixed frame corresponding to the installation box is installed on the upper end of the base on the side of the installation box away from the guide cloth feeding assembly, the end of the second fixed frame away from the installation box is inclined toward the side away from the center position of the base, the inclination angle of the second fixed frame is to adapt to the amplitude change speed of the filter cloth, a first fixed frame is installed on the upper end of the base between the installation box and the second fixed frame, the first fixed frame is perpendicular to the installation box, the first fixed frame is arranged on the side of the installation box away from the center position of the base, the installation box, the second fixed frame and the first fixed frame are provided with a stretching mechanism for stretching the filter cloth, and the second fixed frame and the first fixed frame are provided with a variable amplitude mechanism for changing the stretching width.

[0015] As a further solution of the present invention: the stretching mechanism includes a fourth rotating rod and a cloth clip chain assembly, the fourth rotating rod is vertically installed on one side of the upper end of the installation box close to the guide cloth feeding assembly, the upper end of the fourth rotating rod is installed with a fourth sprocket, the lower end of the fourth rotating rod passes through the installation box and is installed with a driving motor for driving the fourth rotating rod to rotate, the driving motor is installed inside the installation box, a first rotating rod is vertically installed on one side of the upper end of the installation box close to the second fixed frame, the upper end of the first rotating rod is rotatably connected to the first sprocket, a first moving block is arranged inside the first fixed frame, the upper end of the first moving block is vertically installed with a second rotating rod, the upper end of the second rotating rod is rotatably connected to the second sprocket, a second moving block is arranged inside the second fixed frame, the upper end of the second moving block is vertically installed with a third rotating rod, the upper end of the third rotating rod is rotatably connected to the third sprocket, and the cloth clip chain assembly is sleeved on the fourth sprocket, the second sprocket, the third sprocket and the first sprocket.

[0016] As a further scheme of the present invention: the amplitude changing mechanism includes a rotating shaft and a sliding rod, the rotating shaft is arranged inside the second fixed frame, both ends of the rotating shaft are rotatably connected to the inner wall of the second fixed frame, one end of the rotating shaft passes through the side wall of the second fixed frame and is equipped with a motor for driving the rotating shaft to rotate, the motor is installed on the side wall of the second fixed frame, a screw for driving the second moving block to move is installed on the side wall of the rotating shaft inside the second fixed frame, an internal threaded through hole is opened on the second moving block, the side wall of the screw is threadedly connected to the internal threaded through hole of the second moving block, the side wall of the second moving block moves along the inner wall of the second fixed frame, and a hot pressing and rolling mechanism for hot pressing and rolling the filter cloth after the amplitude change is arranged on the two second moving blocks.

[0017] The sliding rod is arranged inside the first fixed frame, and both ends of the sliding rod are installed on the inner wall of the first fixed frame. The sliding rod and the installation box are perpendicular to each other. The first moving block is slidably sleeved on the side wall of the sliding rod, and the side wall of the first moving block moves along the inner wall of the first fixed frame. The sliding rod on the side of the first moving block away from the installation box is sleeved with a tension spring for pulling the first moving block away from the installation box, and both ends of the tension spring are respectively installed on the inner wall of the first fixed frame and the side wall of the first moving block.

[0018] As a further solution of the present invention: a ball bearing is installed on the side wall of the second moving block close to the inner wall of the second fixed frame to facilitate the second moving block to move along the inner wall of the second fixed frame.

[0019] As a further solution of the present invention: the first fixing frame and the installation box are fixedly connected together by welding.

[0020] As a further solution of the present invention: the hot pressing and winding mechanism includes a mounting plate corresponding to the second movable block one by one, the mounting plate being arranged at the upper end of the second fixed frame on the side of the second movable block away from the mounting box, the mounting plate being installed on the side wall of the second movable block, a heating roller assembly mounting seat being installed at the upper end of the mounting plate, a winding assembly mounting seat being installed at the upper end of the mounting plate on the side of the heating roller assembly mounting seat away from the second movable block, heating roller assemblies of different lengths being detachably mounted on the heating roller assembly mounting seat, winding assemblies of different lengths being detachably mounted on the winding assembly mounting seat, telescopic frames and telescopic plates being horizontally mounted on two opposite side walls of the heating roller assembly mounting seats and two opposite side walls of the winding assembly mounting seats, respectively, and the telescopic plates being slidably connected to the inner wall of the telescopic frames.

[0021] As a further solution of the present invention: a ball bearing for supporting the mounting plate is installed at the lower end of the mounting plate, and the lower end of the ball bearing rolls along the upper end of the side wall of the second fixing frame.

[0022] As a further solution of the present invention: the heating roller assembly and the winding assembly are detachably connected to the heating roller assembly mounting seat and the winding assembly mounting seat respectively by bolts.

[0023] As a further solution of the present invention: a fence is installed at the upper end of the side wall of the base to prevent workers from entering during production.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention sets the inclination angle of the second fixed frame to an angle suitable for the filter cloth spreading speed and fixes the angle of the second fixed frame to prevent the filter cloth from spreading too fast or too slow, thereby ensuring the quality of the filter cloth spreading.

[0026] The present invention drives the second moving block, the third rotating rod and the third sprocket to move by a screw rod, and uses a tension spring to assist the elastic movement of the first moving block, the second rotating rod and the second sprocket, thereby changing the position of the stretching end of the cloth clip chain assembly on the second fixed frame, realizing the change of the stretching width of the filter cloth, and then enabling the stretching equipment to process and produce filter cloths with different stretching widths, thereby improving the application range of the equipment.

[0027] The present invention installs the mounting plate on the second moving block, and during the amplitude adjustment process, the mounting positions of the heating roller assembly and the winding assembly are adjusted together, and then the heating roller assembly and the winding assembly that are adapted to the new stretching width are selected, and the heating roller assembly and the winding assembly are installed on the heating roller assembly mounting seat and the winding assembly mounting seat, thereby improving the selection and installation efficiency of the heating roller assembly and the winding assembly, and facilitating use by users. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure inside the second fixing frame in the present invention.

[0030] Figure 3 It is a schematic diagram of the structure inside the first fixing frame in the present invention.

[0031] Figure 4 It is a structural schematic diagram of the hot pressing and winding mechanism in the present invention.

[0032] Wherein: 1. base; 2. mounting box; 3. cloth clip chain assembly; 4. first sprocket; 5. first rotating rod; 6. second sprocket; 7. first moving block; 8. second rotating rod; 9. first fixed frame; 10. second fixed frame; 11. third rotating rod; 12. third sprocket; 13. heating roller assembly mounting seat; 14. winding assembly mounting seat; 15. motor; 16. winding assembly; 17. heating roller assembly; 18. mounting plate; 19. second moving block; 20. fourth sprocket; 21. cloth guide feeding assembly; 22. fourth rotating rod; 23. rotating shaft; 24. screw; 25. sliding rod; 26. tension spring; 27. telescopic frame; 28. telescopic plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 4 In the embodiment of the present invention, the method for processing the filter cloth for dihydrate phosphoric acid comprises the following steps:

[0035] Step 1: The yarn selected should have properties such as abrasion resistance, corrosion resistance and high temperature resistance, so that it can filter phosphoric acid dihydrate.

[0036] Step 2: The yarn selected in step 1 is woven by a loom to form an initial filter cloth. During weaving, attention should be paid to the tension and density of the filter cloth to facilitate filtering of dihydrate phosphoric acid.

[0037] Step 3: Use a stretching device to stretch, heat and shape the filter cloth produced in step 2, and then perform processes such as calendering, cutting, reeding and gluing on the stretched filter cloth to finally make a finished filter cloth.

[0038] Step 4: Use special packaging paper tubes to seal the finished filter cloth in multiple layers.

[0039] A stenting device for processing filter cloth comprises a base 1, wherein two mutually parallel mounting boxes 2 are mounted on the upper end of the base 1, a guide cloth feeding assembly 21 for guiding and conveying the filter cloth is mounted on the upper end of the base 1 at one end of the mounting box 2, a second fixed frame 10 corresponding to the mounting box 2 is mounted on the upper end of the base 1 on the side of the mounting box 2 away from the guide cloth feeding assembly 21, the end of the second fixed frame 10 away from the mounting box 2 is inclined toward the side away from the center position of the base 1, the inclination angle of the second fixed frame 10 is adapted to the amplitude change speed of the filter cloth, a first fixed frame 9 is mounted on the upper end of the base 1 between the mounting box 2 and the second fixed frame 10, the first fixed frame 9 is perpendicular to the mounting box 2, the first fixed frame 9 is arranged on the side of the mounting box 2 away from the center position of the base 1, a stenting mechanism for stenting the filter cloth is arranged on the mounting box 2, the second fixed frame 10 and the first fixed frame 9, and an amplitude change mechanism for changing the stenting width is arranged on the second fixed frame 10 and the first fixed frame 9.

[0040] The tentering mechanism includes a fourth rotating rod 22 and a cloth clip chain assembly 3, the fourth rotating rod 22 is vertically installed on the upper end of the installation box 2 near the guide cloth feeding assembly 21, the upper end of the fourth rotating rod 22 is installed with a fourth sprocket 20, the lower end of the fourth rotating rod 22 passes through the installation box 2 and is installed with a driving motor for driving the fourth rotating rod 22 to rotate, the driving motor is installed inside the installation box 2, the upper end of the installation box 2 near the second fixed frame 10 is vertically installed with a first rotating rod 5, the upper end of the first rotating rod 5 is rotatably connected There is a first sprocket 4, a first moving block 7 is arranged inside the first fixed frame 9, a second rotating rod 8 is vertically installed on the upper end of the first moving block 7, the upper end of the second rotating rod 8 is rotatably connected to the second sprocket 6, a second moving block 19 is arranged inside the second fixed frame 10, a third rotating rod 11 is vertically installed on the upper end of the second moving block 19, the upper end of the third rotating rod 11 is rotatably connected to the third sprocket 12, and the cloth clip chain assembly 3 is sleeved on the fourth sprocket 20, the second sprocket 6, the third sprocket 12 and the first sprocket 4.

[0041] When in use, start the driving motor inside the installation box 2, the driving motor drives the fourth rotating rod 22 and the fourth sprocket 20 to rotate, the fourth sprocket 20 drives the cloth clip chain assembly 3 to rotate, the cloth clip chain assembly 3 pulls the two sides of the filter cloth to move, and since the second fixed frame 10 is tilted outward, the cloth clip chain assembly 3 above the second fixed frame 10 stretches the filter cloth.

[0042] The amplitude changing mechanism includes a rotating shaft 23 and a sliding rod 25. The rotating shaft 23 is arranged inside the second fixed frame 10. Both ends of the rotating shaft 23 are rotatably connected to the inner wall of the second fixed frame 10. One end of the rotating shaft 23 passes through the side wall of the second fixed frame 10 and is installed with a motor 15 for driving the rotating shaft 23 to rotate. The motor 15 is installed on the side wall of the second fixed frame 10. A screw 24 for driving the second moving block 19 to move is installed on the side wall of the rotating shaft 23 inside the second fixed frame 10. An internal threaded through hole is opened on the second moving block 19. The side wall of the screw 24 is threadedly connected to the internal threaded through hole of the second moving block 19. The side wall of the second moving block 19 moves along the inner wall of the second fixed frame 10. The two second moving blocks 19 are provided with a hot pressing and rolling mechanism for hot pressing and rolling the filter cloth after the amplitude change.

[0043] The slide rod 25 is arranged inside the first fixed frame 9, and the two ends of the slide rod 25 are installed on the inner wall of the first fixed frame 9. The slide rod 25 and the installation box 2 are perpendicular to each other. The first moving block 7 is slidably sleeved on the side wall of the slide rod 25, and the side wall of the first moving block 7 moves along the inner wall of the first fixed frame 9. The slide rod 25 on the side of the first moving block 7 away from the installation box 2 is sleeved with a tension spring 26 for pulling the first moving block 7 away from the installation box 2, and the two ends of the tension spring 26 are respectively installed on the inner wall of the first fixed frame 9 and the side wall of the first moving block 7.

[0044] When in use, the motor 15 is started, and the output end of the motor 15 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives the screw 24 to rotate. Under the action of the thread, the screw 24 drives the second moving block 19 to move, and the second moving block 19 drives the third rotating rod 11 to move, and the third rotating rod 11 drives the third sprocket 12 to move, and the third sprocket 12 pulls or loosens the cloth clip chain assembly 3.

[0045] When the third sprocket 12 pulls the cloth clip chain assembly 3, the cloth clip chain assembly 3 drives the second sprocket 6 to move, the second sprocket 6 drives the second rotating rod 8 to move, the second rotating rod 8 drives the first moving block 7 to move toward the installation box 2, and the first moving block 7 stretches the tension spring 26.

[0046] When the third sprocket 12 loosens the cloth clip chain assembly 3, under the action of elastic force, the tension spring 26 pulls the first moving block 7 away from the installation box 2, the first moving block 7 drives the second rotating rod 8 to move, the second rotating rod 8 drives the second sprocket 6 to move, and the second sprocket 6 drives the cloth clip chain assembly 3 to move.

[0047] The hot pressing winding mechanism includes a mounting plate 18 corresponding to the second moving block 19 one by one, the mounting plate 18 is arranged on the upper end of the second fixed frame 10 on the side of the second moving block 19 away from the mounting box 2, the mounting plate 18 is installed on the side wall of the second moving block 19, a heating roller assembly mounting seat 13 is installed on the upper end of the mounting plate 18, a winding assembly mounting seat 14 is installed on the upper end of the mounting plate 18 on the side of the heating roller assembly mounting seat 13 away from the second moving block 19, heating roller assemblies 17 of different lengths are detachably mounted on the heating roller assembly mounting seat 13, and winding assemblies 16 of different lengths are detachably mounted on the winding assembly mounting seat 14, and telescopic frames 27 and telescopic plates 28 are horizontally mounted on two opposite side walls of the heating roller assembly mounting seat 13 and two opposite side walls of the winding assembly mounting seats 14, respectively, and the telescopic plates 28 are slidably connected to the inner wall of the telescopic frame 27.

[0048] When changing the amplitude, the mounting plate 18 moves with the second moving block 19, and the mounting plate 18 drives the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 to move, and the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 drive the telescopic plate 28 to slide on the inner wall of the telescopic frame 27. After the amplitude change adjustment is completed, the heating roller assembly 17 and the winding assembly 16 of corresponding length are selected and installed on the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 respectively.

[0049] Working principle of stentering equipment for filter cloth processing:

[0050] Before use, adjust the width of the filter cloth according to the width of the cloth. Specifically, start the motor 15, and the output end of the motor 15 drives the rotating shaft 23 to rotate, and the rotating shaft 23 drives the screw 24 to rotate. Under the action of the thread, the screw 24 drives the second moving block 19 to move, and the second moving block 19 drives the third rotating rod 11 to move, and the third rotating rod 11 drives the third sprocket 12 to move away from the installation box 2, and the third sprocket 12 pulls the cloth clip chain assembly 3 to move, so that the stretching width becomes wider. Conversely, the third rotating rod 11 drives the third sprocket 12 to move close to the installation box 2, and the third sprocket 12 loosens the cloth clip chain assembly 3 to narrow the stretching width.

[0051] When the third sprocket 12 pulls the cloth clip chain assembly 3, the cloth clip chain assembly 3 drives the second sprocket 6 to move, the second sprocket 6 drives the second rotating rod 8 to move, the second rotating rod 8 drives the first moving block 7 to move toward the installation box 2, and the first moving block 7 stretches the tension spring 26. When the third sprocket 12 loosens the cloth clip chain assembly 3, under the action of elastic force, the tension spring 26 pulls the first moving block 7 away from the installation box 2, the first moving block 7 drives the second rotating rod 8 to move, the second rotating rod 8 drives the second sprocket 6 to move, and the second sprocket 6 drives the cloth clip chain assembly 3 to move.

[0052] At the same time, the mounting plate 18 moves with the second moving block 19, and the mounting plate 18 drives the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 to move, and the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 drive the telescopic plate 28 to slide on the inner wall of the telescopic frame 27. After the amplitude adjustment is completed, the heating roller assembly 17 and the winding assembly 16 of corresponding length are selected and installed on the heating roller assembly mounting seat 13 and the winding assembly mounting seat 14 respectively.

[0053] When in use, start the driving motor inside the installation box 2, the driving motor drives the fourth rotating rod 22 and the fourth sprocket 20 to rotate, the fourth sprocket 20 drives the cloth clip chain assembly 3 to rotate, the cloth clip chain assembly 3 pulls the two sides of the filter cloth to move, and since the second fixed frame 10 is inclined outward, the cloth clip chain assembly 3 above the second fixed frame 10 stretches the filter cloth, and then it is heat-pressed and shaped by the heating roller assembly 17, and then the filter cloth is rolled up by the winding assembly 16.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A method for processing a filter cloth for dihydrate phosphoric acid, characterized in that: The following steps are involved: Step 1: The selected yarn should have properties such as abrasion resistance, corrosion resistance and high temperature resistance, so that it can filter phosphoric acid dihydrate; Step 2: Weaving the yarn selected in step 1 through a loom to form an initial filter cloth. During weaving, attention should be paid to the tension and density of the filter cloth to facilitate filtering of dihydrate phosphoric acid; Step 3: Use a tentering device to tenter and heat the filter cloth produced in step 2 to finalize the shape, and then perform processes such as calendering, cutting, reeding and gluing on the tentered filter cloth to finally produce a finished filter cloth; Step 4: Use special packaging paper tubes to seal the finished filter cloth in multiple layers.

2. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 1, characterized in that: The invention comprises a base (1), wherein two mutually parallel installation boxes (2) are installed on the upper end of the base (1), a guide cloth feeding assembly (21) for guiding and conveying filter cloth is installed on the upper end of the base (1) at one end of the installation box (2), and a second fixing frame (10) corresponding to the installation box (2) is installed on the upper end of the base (1) at the side of the installation box (2) away from the guide cloth feeding assembly (21), and the end of the second fixing frame (10) away from the installation box (2) is inclined toward a side away from the center position of the base (1), and the inclination angle of the second fixing frame (10) is In order to adapt to the variable width speed of the filter cloth, a first fixed frame (9) is installed on the upper end of the base (1) between the installation box (2) and the second fixed frame (10), the first fixed frame (9) and the installation box (2) are perpendicular to each other, the first fixed frame (9) is arranged on a side of the installation box (2) away from the center position of the base (1), the installation box (2), the second fixed frame (10) and the first fixed frame (9) are provided with a stretching mechanism for stretching the filter cloth, and the second fixed frame (10) and the first fixed frame (9) are provided with a variable width mechanism for changing the stretching width.

3. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 2, characterized in that: The tentering mechanism comprises a fourth rotating rod (22) and a cloth clip chain assembly (3); the fourth rotating rod (22) is vertically mounted on a side of the upper end of the installation box (2) close to the guide cloth feeding assembly (21); a fourth sprocket (20) is mounted on the upper end of the fourth rotating rod (22); a driving motor for driving the fourth rotating rod (22) to rotate is mounted on the lower end of the fourth rotating rod (22) passing through the installation box (2); the driving motor is mounted inside the installation box (2); a first rotating rod (5) is vertically mounted on a side of the upper end of the installation box (2) close to the second fixed frame (10); the upper end of the first rotating rod (5) is rotatably connected to the first rotating rod (20); The first fixed frame (9) is provided with a first moving block (7) inside, a second rotating rod (8) is vertically mounted on the upper end of the first moving block (7), the upper end of the second rotating rod (8) is rotatably connected to the second sprocket (6), the second fixed frame (10) is provided with a second moving block (19) inside, a third rotating rod (11) is vertically mounted on the upper end of the second moving block (19), the upper end of the third rotating rod (11) is rotatably connected to the third sprocket (12), and the cloth clip chain assembly (3) is sleeved on the fourth sprocket (20), the second sprocket (6), the third sprocket (12) and the first sprocket (4).

4. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 3, characterized in that: The amplitude changing mechanism comprises a rotating shaft (23) and a sliding rod (25), wherein the rotating shaft (23) is arranged inside the second fixed frame (10), and both ends of the rotating shaft (23) are rotatably connected to the inner wall of the second fixed frame (10), and one end of the rotating shaft (23) passes through the side wall of the second fixed frame (10) and is installed with a motor (15) for driving the rotating shaft (23) to rotate, and the motor (15) is installed on the side wall of the second fixed frame (10), and a screw rod (24) for driving the second moving block (19) to move is installed on the side wall of the rotating shaft (23) inside the second fixed frame (10), and the second moving block (19) is provided with an internal thread through hole, and the side wall of the screw rod (24) is threadedly connected to the internal thread through hole of the second moving block (19), and the side wall of the second moving block (19) moves along the inner wall of the second fixed frame (10), and the two second moving blocks (19) are provided with a hot pressing and rolling mechanism for hot pressing and rolling the filter cloth after the amplitude changing; The slide bar (25) is arranged inside the first fixed frame (9), and the two ends of the slide bar (25) are mounted on the inner wall of the first fixed frame (9). The slide bar (25) and the installation box (2) are perpendicular to each other. The first moving block (7) is slidably sleeved on the side wall of the slide bar (25), and the side wall of the first moving block (7) moves along the inner wall of the first fixed frame (9). The slide bar (25) on the side of the first moving block (7) away from the installation box (2) is sleeved with a tension spring (26) for pulling the first moving block (7) away from the installation box (2), and the two ends of the tension spring (26) are respectively mounted on the inner wall of the first fixed frame (9) and the side wall of the first moving block (7).

5. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 4, characterized in that: A ball bearing is installed on the side wall of the second moving block (19) close to the inner wall of the second fixed frame (10) to facilitate the second moving block (19) to move along the inner wall of the second fixed frame (10).

6. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 4, characterized in that: The first fixing frame (9) and the installation box (2) are fixedly connected together by welding.

7. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 4, characterized in that: The hot pressing and winding mechanism comprises a mounting plate (18) corresponding to the second moving block (19) in a one-to-one manner, the mounting plate (18) being arranged at the upper end of the second fixed frame (10) on the side of the second moving block (19) away from the mounting box (2), the mounting plate (18) being mounted on the side wall of the second moving block (19), the upper end of the mounting plate (18) being mounted with a heating roller assembly mounting seat (13), the upper end of the mounting plate (18) on the side of the heating roller assembly mounting seat (13) away from the second moving block (19) being mounted with a A winding assembly mounting seat (14), wherein a heating roller assembly (17) of different lengths can be detachably mounted on the heating roller assembly mounting seat (13), and a winding assembly (16) of different lengths can be detachably mounted on the winding assembly mounting seat (14), and a telescopic frame (27) and a telescopic plate (28) are horizontally mounted on two opposite side walls of the heating roller assembly mounting seat (13) and two opposite side walls of the winding assembly mounting seat (14), respectively, and the telescopic plate (28) is slidably connected to the inner wall of the telescopic frame (27).

8. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 7, characterized in that: A ball bearing for supporting the mounting plate (18) is mounted on the lower end of the mounting plate (18), and the lower end of the ball bearing rolls along the upper end of the side wall of the second fixing frame (10).

9. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 7, characterized in that: The heating roller assembly (17) and the winding assembly (16) are detachably connected to the heating roller assembly mounting seat (13) and the winding assembly mounting seat (14) respectively via bolts.

10. The tentering equipment for processing filter cloth for dihydrate phosphoric acid according to claim 2, characterized in that: A fence is installed at the upper end of the side wall of the base (1) to prevent workers from entering during production.

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