WO2024065278A1

WO2024065278A1 - Cotton spreading machine

Info

Publication number: WO2024065278A1
Application number: PCT/CN2022/122144
Authority: WO
Inventors: 唐宇; 刘春�; 丁巍冬; 杨豪; 初丽娜; 陶健; 谢昌江; 吴琦; 杨威
Original assignee: 南京玻璃纤维研究设计院有限公司
Priority date: 2022-09-26
Filing date: 2022-09-28
Publication date: 2024-04-04
Also published as: CN115538040A

Abstract

Embodiments of the present invention relate to the technical field of cotton spreading, and in particular to a cotton spreading machine. The cotton spreading machine comprises a rack, a supporting base, a conveying mechanism, a gear motor, a link, and a crank. The conveying mechanism is rotatably connected to the rack by means of a rotating fulcrum. The gear motor is arranged on the supporting base. A first end of the crank is fixedly connected to an output shaft of the gear motor, and a second end of the crank is rotatably connected to a first end of the link. The gear motor is used for driving the conveying mechanism to swing by means of the crank and the link. The conveying mechanism comprises a frame and two belt conveyors fixedly connected to the frame, a gap formed between the two belt conveyors is used for allowing a primary felt to pass through, a first strip-shaped hole is formed in the portion of the frame directly facing the gap, and a second end of the link is mounted in the first strip-shaped hole by means of a connecting shaft. The distance from the rotating fulcrum to the connecting shaft is changed by adjusting the mounting position of the connecting shaft in the first strip-shaped hole, so that the width of a secondary felt formed from the primary felt is adjusted. The present solution can ensure the production of products having different widths.

Description

A cotton spreading machine

Technical Field

The embodiments of this specification relate to the field of cotton spreading technology, and more particularly to a cotton spreading machine.

Background technique

The rock wool laying machine is the core equipment in rock wool production. Its function is to re-lay the primary felt collected by the rock wool collector into a secondary felt with a certain width (i.e. width), thickness and number of layers through a back-and-forth swinging conveying mechanism for subsequent pleating, pressurization, curing and finished product processing.

In the related art, the cotton spreading machine cannot adjust the width specifications in terms of mechanical structure, resulting in each cotton spreading machine being able to adapt to only one width production line, and therefore being unable to guarantee the production of products of different widths.

Therefore, a cotton spreading machine is urgently needed to solve the above problems.

Summary of the invention

The embodiments of this specification provide a cotton spreading machine that can ensure the production of products of different widths.

The embodiment of the present specification provides a cotton spreading machine, including a frame, a support seat, a conveying mechanism, a reduction motor, a connecting rod and a crank, wherein the conveying mechanism is rotatably connected to the frame via a rotating fulcrum, the reduction motor is arranged on the support seat, the first end of the crank is fixedly connected to the output shaft of the reduction motor, the second end of the crank is rotatably connected to the first end of the connecting rod, and the reduction motor is used to drive the conveying mechanism to swing via the crank and the connecting rod;

The conveying mechanism comprises a frame and two belt conveyors fixedly connected to the frame, a gap formed between the two belt conveyors is used to pass a primary felt, a portion of the frame facing the gap is provided with a first strip hole, and the second end of the connecting rod is mounted in the first strip hole through a connecting shaft;

The installation position of the connecting shaft in the first strip hole is adjusted to change the distance from the rotation fulcrum to the connecting shaft, thereby adjusting the width of the secondary felt formed by the primary felt.

In a possible design, the support seat is provided with a first adjustment component, so that the height of the output shaft of the reduction motor can be adjusted by using the first adjustment component, so that when the conveying mechanism swings to the lowest point, the height of the output shaft of the reduction motor is the same as the height of the connecting shaft.

In a possible design, the distance from the rotation fulcrum to the connecting axis is 500-750 mm, and correspondingly, the width of the secondary felt is 1200-2400 mm; wherein, the distance from the rotation fulcrum to the connecting axis is negatively correlated with the width of the secondary felt.

In a possible design, the crank is provided with a second strip hole, and the installation position of the output shaft of the reduction motor in the second strip hole is adjusted to change the distance from the intersection of the connecting rod and the crank to the output shaft of the reduction motor, thereby adjusting the width of the secondary felt.

In a possible design, the distance from the intersection of the connecting rod and the crank to the output shaft of the reduction motor is 158 to 292 mm, and correspondingly, the width of the secondary felt is 0 to 700 mm; wherein, the distance from the intersection of the connecting rod and the crank to the output shaft of the reduction motor is positively correlated with the width of the secondary felt.

In a possible design, the connecting rod is provided with a second adjusting component. When the conveying mechanism is at the lowest point of the swing, the installation position of the output shaft of the reduction motor in the second bar hole is adjusted and the length of the connecting rod is adjusted by using the second adjusting component, so that the angle between the position of the crank at the current moment and the vertical direction does not exceed a preset degree.

In a possible design, the support seat is provided with a third adjusting component. When the conveying mechanism is at the lowest point of the swing, the installation position of the output shaft of the reduction motor in the second bar hole is adjusted, the length of the connecting rod is adjusted by the second adjusting component, and the horizontal position of the reduction motor on the support seat is adjusted by the third adjusting component, so that the angle between the position of the crank at the current moment and the vertical direction does not exceed a preset degree.

In a possible design, the length of the connecting rod is 2740-2770 mm.

In a possible design, the preset degree is 2°.

In a possible design, each of the belt conveyors includes a transmission motor, a conveying belt and a roller. The transmission motor is used to drive the conveying belt to rotate around the roller. The roller is located at both ends of the conveying belt. The conveying belts of the two belt conveyors rotate in opposite directions.

In a possible design, the distance from the rotation fulcrum to the roller at the bottom end of the conveyor belt is 1.8 to 2.1 m; and/or,

The roller is made of a composite material; wherein the composite material includes carbon fiber, glass fiber, aluminum alloy and titanium alloy; and/or,

The frame is made of alloy material; wherein the alloy material includes aluminum alloy and titanium alloy.

In a possible design, a speed compensation module is provided in the reduction motor, and the speed compensation module is used to perform the following operations:

When the conveying mechanism swings to the lowest point, the reduction motor is controlled to accelerate according to a preset speed compensation formula, so that the conveying mechanism swings from the lowest point to the highest point at a uniform speed;

When the conveying mechanism swings to the highest point, the reduction motor is controlled to decelerate according to the speed compensation formula, so that the conveying mechanism swings from the highest point to the lowest point at a uniform speed.

In one possible design, the speed compensation formula is:

n＝(500*V _x *i*C)/(sinβ*B*D*π)

Wherein, n is the rotation speed of the reduction motor, _Vx is the horizontal component speed of the conveying mechanism at the lowest point, i is the speed ratio of the reduction motor, C is the distance from the rotating fulcrum to the connecting axis, β is the angle between the crank and the target horizontal direction, the target horizontal direction is the horizontal direction of the conveying mechanism pointing to the reduction motor, B is the distance from the intersection of the connecting rod and the crank to the output shaft of the reduction motor, and D is the distance from the rotating fulcrum to the bottom of the conveying mechanism.

It can be seen from the above scheme that the cotton spreading machine is provided with a first strip hole on the part of the frame facing the gap, and the second end of the connecting rod is installed in the first strip hole through a connecting shaft. In this way, the distance from the rotating fulcrum to the connecting shaft can be changed by adjusting the installation position of the connecting shaft in the first strip hole, so that the width of the secondary felt formed by the primary felt can be adjusted, thereby ensuring the production of products with different widths.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a cotton spreading machine provided in one embodiment of the present specification;

FIG. 2 is a schematic diagram of the structure of the crank in the cotton spreading machine shown in FIG. 1 .

Reference numerals:

1- rack;

2- support seat;

21- third adjustment component;

3- conveying mechanism;

31-rotation fulcrum;

32-frame;

321-first strip hole;

322-connecting shaft;

33-belt conveyor;

331- transmission motor;

332- conveyor belt;

333- roller;

4-reduction motor;

5- Connecting rod;

51- second adjustment component;

6-crank;

61 - Second strip hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present specification more clear, the technical solutions in the embodiments of the present specification will be clearly and completely described in conjunction with the drawings in the embodiments of the present specification. Obviously, the described embodiments are part of the embodiments of the present specification, not all of them. Based on the embodiments in the embodiments of the present specification, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of the present specification.

FIG1 is a schematic diagram of the structure of a cotton spreading machine provided in one embodiment of the present specification. Please refer to FIG1 , the cotton spreading machine includes a frame 1, a support seat 2, a conveying mechanism 3, a reduction motor 4, a connecting rod 5 and a crank 6, the conveying mechanism 3 is rotatably connected to the frame 1 through a rotating fulcrum 31, the reduction motor 4 is arranged on the support seat 2, the first end of the crank 6 is fixedly connected to the output shaft 322 of the reduction motor 4, the second end of the crank 6 is rotatably connected to the first end of the connecting rod 5, and the reduction motor 4 is used to drive the conveying mechanism 3 to swing through the crank 6 and the connecting rod 5;

The conveying mechanism 3 includes a frame 32 and two belt conveyors 33 fixedly connected to the frame 32. The gap formed between the two belt conveyors 33 is used to pass the primary felt. The portion of the frame 32 facing the gap is provided with a first strip hole 321. The second end of the connecting rod 5 is installed in the first strip hole 321 through a connecting shaft.

By adjusting the installation position of the connecting shaft in the first strip hole 321 to change the distance from the rotation fulcrum 31 to the connecting shaft 322 , the width of the secondary felt formed by the primary felt can be adjusted.

In this embodiment, the cotton spreading machine is provided with a first strip hole 321 on the portion of the frame 32 opposite to the gap, and the second end of the connecting rod 5 is installed in the first strip hole 321 through the connecting shaft 322. In this way, the distance from the rotating fulcrum 31 to the connecting shaft 322 can be changed by adjusting the installation position of the connecting shaft 322 in the first strip hole 321, so that the width of the secondary felt formed by the primary felt can be adjusted, thereby ensuring the production of products with different widths, that is, adapting to production lines with different widths.

It can be known that the width of the secondary felt determines the width of the production line. The larger the width, the higher the production capacity. Therefore, it is necessary to adaptively adjust the width of the secondary felt according to the actual width requirements of the production line.

The core of the above-mentioned cotton spreading machine is a set of connecting rod structures. The specific working process is as follows: the reduction motor 4 is started, and the output shaft of the reduction motor 4 drives the crank 6 to rotate to push the connecting rod 5 connected to the crank 6 to move back and forth. The second end of the connecting rod 5 pushes the conveying mechanism 3 to swing back and forth around the rotating fulcrum 31 through the connecting shaft 322. In this way, the conveying mechanism 3 will swing back and forth once when the reduction motor 4 rotates one circle. At the same time, the primary felt passes through the gap formed between the two belt conveyors 33 and is then sent out from the bottom of the conveying mechanism 3. Under the action of the back and forth swing of the conveying mechanism 3, the primary felt is stacked layer by layer on the forming machine (not shown in the figure) located below to form a secondary felt with a certain width, thickness and number of layers.

In one embodiment of the present specification, the distance from the rotation fulcrum 31 to the connecting axis is 500-750 mm, and correspondingly, the width of the secondary felt is 1200-2400 mm; wherein, the distance from the rotation fulcrum 31 to the connecting axis is negatively correlated with the width of the secondary felt.

In this embodiment, by controlling the distance from the rotating fulcrum 31 to the connecting axis to be 500-750 mm, the production line width of the cotton spreading machine can cover 1200-2400 mm, so that the cotton spreading machine can adapt to all production line width requirements on the market, thereby solving the limitation that the same cotton spreading machine cannot produce products with more than two widths. In addition, the distance from the rotating fulcrum 31 to the connecting axis (i.e., dimension C in FIG1 ) is negatively correlated with the width of the secondary felt, i.e., the smaller the dimension C, the larger the width of the secondary felt, and the larger the dimension C, the smaller the width of the secondary felt.

Since the smaller the dimension C is, the larger the swing amplitude of the conveying mechanism 3 is, the higher the load of the reduction motor 4 is at the same swing speed of the conveying mechanism 3. In order to reduce the load of the reduction motor 4, it is possible to consider fine-tuning the width of the secondary felt.

In one embodiment of the present specification, the crank 6 is provided with a second bar hole 61 (see FIG. 2 ), and the installation position of the output shaft of the reduction motor 4 in the second bar hole 61 is adjusted to change the distance from the intersection of the connecting rod 5 and the crank 6 to the output shaft of the reduction motor 4, thereby adjusting the width of the secondary felt.

In this embodiment, by setting a second strip hole 61 in the crank 6, the distance from the intersection of the connecting rod 5 and the crank 6 to the output shaft of the reduction motor 4 (i.e., dimension B in Figure 1) can be changed by adjusting the installation position of the output shaft of the reduction motor 4 in the second strip hole 61, thereby adjusting the width of the secondary felt and reducing the load of the reduction motor 4.

In one embodiment of the present specification, the distance from the intersection of the connecting rod 5 and the crank 6 to the output shaft of the reduction motor 4 is 158-292 mm, and correspondingly, the width of the secondary felt is 0-700 mm; wherein, the distance from the intersection of the connecting rod 5 and the crank 6 to the output shaft of the reduction motor 4 is positively correlated with the width of the secondary felt, that is, the smaller the dimension B is, the smaller the width of the secondary felt is, and the larger the dimension B is, the larger the width of the secondary felt is.

That is to say, by controlling the size of dimension C and dimension B, the width of the cotton spreading machine can be quickly adjusted and fine-tuned, so that products of different widths can be produced.

Since the reduction motor 4 of the cotton spreading machine is located on one side of the conveying mechanism 3, in order to ensure that the density deviation of the formed secondary felt along the swinging direction of the conveying mechanism 3 is as small as possible, it is necessary to consider setting the height of the output shaft of the reduction motor 4 and the height of the connecting shaft 322 to the same.

In one embodiment of the present specification, the support base 2 is provided with a first adjusting component (not shown in the figure), so that the height of the output shaft of the reduction motor 4 is adjusted by using the first adjusting component, so that when the conveying mechanism 3 swings to the lowest point, the height of the output shaft of the reduction motor 4 is the same as the height of the connecting shaft.

It can be understood that the first adjusting component can be implemented as any form of lifting structure, such as a motor lifting structure, a hydraulic lifting structure, a pneumatic lifting structure, etc. The specific form of the first adjusting component is not limited here.

In one embodiment of the present specification, the connecting rod 5 is provided with a second adjusting component 51. When the conveying mechanism 3 is at the lowest point of the swing, the installation position of the output shaft of the reduction motor 4 in the second bar hole 61 is adjusted and the length of the connecting rod 5 is adjusted by using the second adjusting component 51, so that the angle between the position of the crank 6 at the current moment and the vertical direction does not exceed a preset degree.

In this embodiment, when the conveying mechanism 3 is at the lowest point of the swing, the installation position of the output shaft of the reduction motor 4 in the second strip hole 61 is adjusted and the length of the connecting rod 5 (i.e., dimension A in Figure 1) is adjusted by using the second adjustment component 51. That is, when the conveying mechanism 3 is at the lowest point of the swing, by changing dimensions A and B to match the change in the angle between the crank 6 and the vertical direction, the swing center of the cotton spreading machine can be fine-tuned so that the two swing strokes of the cotton spreading machine are nearly symmetrical, thereby further reducing the density deviation of the product.

It can be known that the implementation method of the second adjustment component 51 can be any structure that can achieve adjustable length, such as thread adjustment, telescopic adjustment, etc., and the implementation method of the second adjustment component 51 is not limited here.

In order to further achieve fine adjustment of the swing center of the cotton spreading machine, it is also possible to further consider adjusting the horizontal position of the reduction motor 4.

In one embodiment of the present specification, the support base 2 is provided with a third adjusting component 21. When the conveying mechanism 3 is located at the lowest point of the swing, the output shaft of the reduction motor 4 is adjusted to the installation position of the second bar hole 61, the second adjusting component 51 is used to adjust the length of the connecting rod 5, and the third adjusting component 21 is used to adjust the horizontal position of the reduction motor 4 on the support base 2, so that the angle between the position of the crank 6 at the current moment and the vertical direction (i.e., α in Figure 1) does not exceed the preset degree.

It can be known that the implementation method of the third adjustment component 21 can be any structure that can achieve horizontal adjustment, such as bolt adjustment, slide rail adjustment, etc. The implementation method of the third adjustment component 21 is not limited here.

In one embodiment of the present specification, the length of the connecting rod 5 is 2740-2770 mm.

In one embodiment of the present specification, the preset degree is 2°.

In the related art, two belt conveyors share a transmission motor, which can drive the two belt conveyors through rollers and a reversing structure. However, this method has transmission errors, that is, there is a difference in the conveying speeds of the two belt conveyors, which will increase the load on the rollers.

In order to solve this technical problem, in one embodiment of the present specification, each belt conveyor 33 includes a transmission motor 331, a conveying belt 332 and a roller 333. The transmission motor 331 is used to drive the conveying belt 332 to rotate around the roller 333. The roller 333 is located at both ends of the conveying belt 332. The conveying belts 332 of the two belt conveyors 33 rotate in opposite directions.

In this embodiment, by providing each belt conveyor 33 with a transmission motor 331, the transmission synchronization ratio of the two conveyor belts 332 can be effectively adjusted, thereby achieving synchronization of the two belt conveyors 33. Moreover, compared with the design of a single motor, this solution can reduce the load of the roller, thereby increasing the service life of the roller.

In the related art, the effective length (i.e., dimension D) of the conveying mechanism is generally more than 2.5 meters, and it is made of steel material, which results in a large swing inertia of the conveying mechanism, and the swing frequency of the conveying mechanism is less than 30 times/minute, resulting in a low number of secondary felt stacking layers. Since the number of stacking layers of secondary cotton felt determines the strength of the product to a certain extent, the more layers, the better the cross-distribution of the cotton felt in the three-dimensional distribution, and the better the strength of the finished product, so when the number of stacking layers of secondary felt is not high, the product strength is also not ideal.

In order to solve this technical problem, it may be considered to reduce the weight of the conveying mechanism 3 .

In one embodiment of the present specification, the distance from the rotation fulcrum 31 to the roller 333 located at the bottom end of the conveyor belt 332 is 1.8 to 2.1 m (ie, dimension D in FIG. 1 ).

In this embodiment, since the effect of increasing the width of the secondary felt can be achieved by changing the dimension C, the dimension D can be controlled within 1.8 to 2.1 m, so that the conveying mechanism 3 can be lightweight while increasing the width.

In one embodiment of the present specification, the roller 333 is made of a composite material; wherein the composite material includes carbon fiber, glass fiber, aluminum alloy and titanium alloy.

In one embodiment of the present specification, the frame 32 is made of alloy material; wherein the alloy material includes aluminum alloy and titanium alloy.

Therefore, through the above-mentioned lightweight design of the conveying mechanism 3, the weight of the conveying mechanism 3 is reduced, the swing inertia is reduced, and the number of swings is increased from less than 30 times/minute to 50 times/minute; and the number of stacking layers of the secondary felt is increased by 25%, and the product strength is improved.

It is understandable that the above-mentioned composite materials and alloy materials are just a few specific materials listed in the embodiments of this specification. Of course, other materials that can meet the lightweight design requirements are also within the protection scope of the embodiments of this specification, and these materials are not listed one by one here.

In the related art, the reduction motor does not have the function of speed compensation, which makes the horizontal component speed of the conveying mechanism the fastest when it swings to the lowest point, and the horizontal component speed the slowest (0) when it swings to the highest point. Due to the different horizontal component speeds of the conveying mechanism during the swinging process, the thickness of the stacked secondary felt in the width direction is uneven, which leads to poor density uniformity in the width direction of the product.

In order to solve this technical problem, it may be considered to add a speed compensation function to the reduction motor 4 .

In one embodiment of the present specification, a speed compensation module is provided in the reduction motor 4, and the speed compensation module is used to perform the following operations:

When the conveying mechanism 3 swings to the lowest point, the reduction motor 4 is controlled to accelerate according to a preset speed compensation formula, so that the conveying mechanism 3 swings from the lowest point to the highest point at a uniform speed;

When the conveying mechanism 3 swings to the highest point, the reduction motor 4 is controlled to decelerate according to the speed compensation formula, so that the conveying mechanism 3 swings from the highest point to the lowest point at a uniform speed.

In this embodiment, by providing a speed compensation module in the reduction motor 4, the horizontal speed component of the conveying mechanism 3 remains unchanged during the swinging process, thereby ensuring that the thickness of the stacked secondary felt in the width direction is uniform.

In one embodiment of this specification, the speed compensation formula is:

n＝500*Vx*i*C/sinβ*B*D*π

Wherein, n is the rotation speed of the reduction motor 4, Vx is the horizontal component speed of the conveying mechanism 3 when it is at the lowest point, i is the speed ratio of the reduction motor 4, C is the distance from the rotating fulcrum 31 to the connecting axis, β is the angle between the crank 6 and the target horizontal direction, the target horizontal direction is the horizontal direction from the conveying mechanism 3 to the reduction motor 4, B is the distance from the intersection of the connecting rod 5 and the crank 6 to the output shaft of the reduction motor 4, and D is the distance from the rotating fulcrum 31 to the bottom of the conveying mechanism 3.

In this embodiment, the inventor creatively provides a speed compensation formula for the specific structure of the cotton spreading machine provided in the embodiment of this specification. By using the speed compensation formula, the horizontal speed component of the conveying mechanism 3 can be kept constant during the swinging process, thereby ensuring that the thickness of the stacked secondary felt in the width direction is uniform. It can be seen from the calculation that after speed compensation, the maximum acceleration multiple of the reduction motor is controlled at 1.2 to 1.4, and the unevenness of the product in the width direction is reduced to less than 5%.

It can be understood that when the conveying mechanism 3 swings to the lowest point, the angle β in FIG. 1 is approximately 90 degrees, and when the conveying mechanism 3 swings to the left to the highest point, the angle β is approximately 180 degrees.

It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the statement "comprise one..." do not exclude the existence of other identical factors in the process, method, article or equipment including the elements.

Finally, it should be noted that the above is only a preferred embodiment of the embodiments of this specification, which is only used to illustrate the technical solutions of the embodiments of this specification, and is not used to limit the protection scope of the embodiments of this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of this specification are included in the protection scope of the embodiments of this specification.

Claims

A cotton spreading machine, characterized in that it comprises a frame (1), a support seat (2), a conveying mechanism (3), a reduction motor (4), a connecting rod (5) and a crank (6); the conveying mechanism (3) is rotatably connected to the frame (1) via a rotating fulcrum (31); the reduction motor (4) is arranged on the support seat (2); the first end of the crank (6) is fixedly connected to the output shaft of the reduction motor (4); the second end of the crank (6) is rotatably connected to the first end of the connecting rod (5); the reduction motor (4) is used to drive the conveying mechanism (3) to swing via the crank (6) and the connecting rod (5);

The conveying mechanism (3) comprises a frame (32) and two belt conveyors (33) fixedly connected to the frame (32); a gap formed between the two belt conveyors (33) is used for passing a primary felt; a first strip-shaped hole (321) is provided at a portion of the frame (32) facing the gap; and the second end of the connecting rod (5) is mounted on the first strip-shaped hole (321) via a connecting shaft (322);

By adjusting the installation position of the connecting shaft (322) in the first strip-shaped hole (321), the distance from the rotation fulcrum (31) to the connecting shaft (322) is changed, thereby adjusting the width of the secondary felt formed by the primary felt.
The cotton spreading machine according to claim 1 is characterized in that the support seat (2) is provided with a first adjusting component, so that the height of the output shaft of the reduction motor (4) can be adjusted by using the first adjusting component, so that when the conveying mechanism (3) swings to the lowest point, the height of the output shaft of the reduction motor (4) is the same as the height of the connecting shaft (322).
The cotton spreading machine according to claim 1 is characterized in that the distance from the rotating fulcrum (31) to the connecting shaft (322) is 500-750 mm, and correspondingly, the width of the secondary felt is 1200-2400 mm; wherein, the distance from the rotating fulcrum (31) to the connecting shaft (322) is negatively correlated with the width of the secondary felt.
The cotton spreading machine according to claim 1 is characterized in that the crank (6) is provided with a second strip hole (61), and the installation position of the output shaft of the reduction motor (4) in the second strip hole (61) is adjusted to change the distance from the intersection of the connecting rod (5) and the crank (6) to the output shaft of the reduction motor (4), thereby adjusting the width of the secondary felt.
The cotton spreading machine according to claim 4 is characterized in that the distance from the intersection of the connecting rod (5) and the crank (6) to the output shaft of the reduction motor (4) is 158 to 292 mm, and correspondingly, the width of the secondary felt is 0 to 700 mm; wherein the distance from the intersection of the connecting rod (5) and the crank (6) to the output shaft of the reduction motor (4) is positively correlated with the width of the secondary felt.
The cotton spreading machine according to claim 4 is characterized in that the connecting rod (5) is provided with a second adjusting component (51). When the conveying mechanism (3) is located at the lowest point of the swing, the installation position of the output shaft of the reduction motor (4) in the second bar hole (61) is adjusted and the length of the connecting rod (5) is adjusted by using the second adjusting component (51), so that the angle between the position of the crank (6) at the current moment and the vertical direction does not exceed a preset degree.
The cotton spreading machine according to claim 6 is characterized in that the support seat (2) is provided with a third adjusting component (21). When the conveying mechanism (3) is located at the lowest point of the swing, by adjusting the installation position of the output shaft of the reduction motor (4) in the second strip hole (61), using the second adjusting component (51) to adjust the length of the connecting rod (5), and using the third adjusting component (21) to adjust the horizontal position of the reduction motor (4) on the support seat (2), the angle between the position of the crank (6) at the current moment and the vertical direction does not exceed a preset degree.
The cotton spreading machine according to claim 6 is characterized in that the length of the connecting rod (5) is 2740-2770 mm.
The cotton spreading machine according to claim 6 is characterized in that the preset degree is 2°.
The cotton spreading machine according to claim 1 is characterized in that each of the belt conveyors (33) includes a transmission motor (331), a conveying belt (332) and a roller (333), the transmission motor (331) is used to drive the conveying belt (332) to rotate around the roller (333), the roller (333) is located at both ends of the conveying belt (332), and the conveying belts (332) of the two belt conveyors (33) rotate in opposite directions.
The cotton spreading machine according to claim 10 is characterized in that the distance from the rotating fulcrum (31) to the roller (333) located at the bottom end of the conveyor belt (332) is 1.8 to 2.1 m; and/or,

The roller (333) is made of a composite material; wherein the composite material includes carbon fiber, glass fiber, aluminum alloy and titanium alloy; and/or,

The frame (32) is made of alloy material; wherein the alloy material includes aluminum alloy and titanium alloy.
The cotton spreading machine according to any one of claims 1 to 11 is characterized in that a speed compensation module is provided in the reduction motor (4), and the speed compensation module is used to perform the following operations:

When the conveying mechanism (3) swings to the lowest point, the reduction motor (4) is controlled to accelerate according to a preset speed compensation formula, so that the conveying mechanism (3) swings from the lowest point to the highest point at a uniform speed;

When the conveying mechanism (3) swings to the highest point, the deceleration motor (4) is controlled to decelerate according to the speed compensation formula, so that the conveying mechanism (3) swings from the highest point to the lowest point at a uniform speed.
The cotton spreading machine according to claim 12 is characterized in that the speed compensation formula is:

n＝(500*V x *i*C)/(sinβ*B*D*π)

In the formula, n is the rotation speed of the reduction motor (4), Vx is the horizontal component speed of the conveying mechanism (3) at the lowest point, i is the speed ratio of the reduction motor (4), C is the distance from the rotating fulcrum (31) to the connecting shaft (322), β is the angle between the crank (6) and the target horizontal direction, the target horizontal direction is the horizontal direction of the conveying mechanism (3) pointing to the reduction motor (4), B is the distance from the intersection of the connecting rod (5) and the crank (6) to the output shaft of the reduction motor (4), and D is the distance from the rotating fulcrum (31) to the bottom end of the conveying mechanism (3).