A method and system for controlling the weight of raw sliver during the speed change process of carding machine production

Abstract

The present invention discloses a control method and system for the weight of raw sliver in the speed change process of a carding machine. The method comprises: a first speed change mode: receiving a first working state instruction of switching from slow to fast speed; in each cotton feeding adjustment cycle c, calculating the reference speed sp[n] of the doffer according to the linear speed change curve of the doffer; sending sp[n] to the auto-leveling controller to control the operation of the cotton feeding until the speed change process is completed; starting the speed change after the doffer delay time T1 until the speed change process is completed; a second speed change mode: receiving a second working state instruction of switching from fast to slow speed; in each cotton feeding adjustment cycle c, calculating the reference speed sp'[n] of the doffer according to the linear speed change curve of the doffer; sending sp'[n] to the auto-leveling controller to control the operation of the cotton feeding until the speed change process is completed; starting the speed change after the doffer delay time T2 until the speed change process is completed. The present invention ensures the stability of the weight of raw sliver.

Description

Technical Field

[0001] The invention relates to the technical field of cotton spinning automation control, and in particular to a method and system for controlling the weight of raw slivers in the speed change process of a carding machine. Background Art

[0002] The carding machine is an important equipment in the spinning process, which is used to process the cotton fibers and chemical fibers sent from the previous process into slivers with uniform weight. Figure 1 The working principle of the carding machine 100 is to feed the cotton (fiber) roll or layer sent from the previous process through the cotton feeding, and then remove the impurities, open and comb through the licker-in roller 10, the cover plate 20 and the cylinder 30, remove the broken seeds, impurities and short fibers left over from the previous process, so that all the curled block materials become basically straight single fibers and adhere to the needle surface of the cylinder 30, and then transfer to the doffer 40 through the cylinder 30, forming a cotton net on the doffer 40, and the cotton net is transferred through the three rollers 50, collected at the bell mouth of the bell 60, and integrated into a certain specification of raw sliver on the large pressure roller 70, and then introduced into the storage mechanism through the coiler 90 and the small pressure roller 80 for storage for use in the subsequent process. Among them, the weight of the raw sliver and the step difference are important indicators of the quality of the raw sliver.

[0003] According to the technological principle of the carding machine, the carding machine has two working states, namely, slow working state and fast working state. The slow working state is mainly for the growth of the raw materials, and the fast working state is for production. When the raw materials fed to the cotton are transferred to the doffer and match the doffer speed, the weight of the raw materials is qualified. The amount of raw materials fed to the cotton is mainly controlled by the feeding speed.

[0004] At present, the cotton feeding speed is mostly controlled by self-adjusting leveler, and the control principle is as follows: by collecting the doffer speed as the reference speed, combining the sliver quantity, cotton layer thickness and other parameters (such as cotton feeding speed, cotton box pressure), according to the mathematical model of the leveler, the cotton feeding speed is calculated, and the cotton feeding amount is adjusted. In the stable state of high-speed production or slow spinning state, since the doffer speed and the reference speed are relatively stable, there is no need to consider the corresponding relationship between the raw material transferred to the doffer and the doffer speed, and the control requirements of the sliver weight can be met at this time.

[0005] However, in the process of switching between the two states, that is, the speed changing process, the raw materials adjusted for cotton feeding can only be transferred to the doffer after being combed and transferred by the licker-in roller, cylinder, etc. According to the mechanical structure and electrical control principle of the cotton carding machine, the reference speed of the collected doffer speed has a lag, and the raw materials adjusted according to this reference speed also have a lag when transferred to the doffer. Therefore, the reference speed corresponding to the raw material transferred to the doffer is not corresponding to the doffer speed at this time in time. Therefore, for the speed changing process, the reference speed corresponding to the raw material transferred to the doffer during acceleration corresponds to the lower doffer speed before, and the doffer speed at this time has become faster, so the weight of the raw yarn will become lighter. The reference speed corresponding to the raw material transferred to the doffer during deceleration corresponds to the higher doffer speed before, and the doffer speed at this time has become slower, so the weight of the raw yarn will become heavier.

[0006] In this way, during the speed change process, the weight deviation of the raw sliver is large (the step difference is large), and the weight of these raw slivers basically exceeds the allowable range and cannot meet the production requirements, becoming waste slivers. These waste slivers need to be manually processed, and most of them are processed together with the slow raw slivers, which affects both work efficiency and production efficiency. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a method for controlling the weight of raw yarn during the speed change process of a cotton carding machine, which adjusts the reference speed according to the change rate of the doffer speed and delays the speed change of the doffer so that the reference speed adjusted in each cotton feeding adjustment cycle is equal to the current speed of the doffer until the reference speed is equal to the target speed of the doffer, and the speed change is completed, so that during the speed change process, the reference speed corresponding to the cotton feed reaching the doffer always corresponds to the doffer speed, thereby ensuring the stability of the raw yarn weight.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] The present application relates to a method for controlling the weight of carded sliver during the speed change process of a carding machine, which is characterized by comprising:

[0010] The first speed change mode: receiving the first working state instruction of switching from slow speed to fast speed;

[0011] In each cotton feeding adjustment cycle c, according to the set doffer linear speed change curve, the reference speed of the doffer sp[n]=sp1+k1*c*n is calculated, and sp[n] is greater than the current speed sp1 and less than or equal to the target speed sp2;

[0012] The reference speed sp[n] is sent to the autoleveler controller to control the cotton feeding operation until the speed change process is completed;

[0013] The doffer starts to change speed after the delay time T1 until the speed change process is completed;

[0014] The second speed change mode: receiving the second working state instruction of fast-to-slow speed change;

[0015] In each cotton feeding adjustment cycle c, according to the doffer linear speed change curve, the reference speed of the doffer sp'[n]=sp1'+k2*c*n is calculated, and sp'[n] is less than the current speed sp1' and greater than or equal to the target speed sp2';

[0016] The reference speed sp'[n] is sent to the autoleveler controller to control the cotton feeding operation until the speed change process is completed;

[0017] The doffer starts to change speed after the delay time T2 until the speed change process is completed;

[0018] Among them, each of the times T1 and T2 can make the reference speed corresponding to the cotton feeding amount reaching the doffer consistent with the doffer speed, n is the adjustment number and n is a natural number greater than or equal to 1, k1 is the acceleration change rate of the doffer, and k2 is the deceleration change rate of the doffer.

[0019] In some embodiments of the present application, the acceleration change rate k1 and the deceleration change rate k2 of the doffer are calculated as follows:

[0020] According to the doffer linear speed change curve, acceleration time t1, and deceleration time t2, the acceleration and deceleration reference speed Ve is obtained;

[0021] According to the acceleration time t1, deceleration time t2 and the acceleration / deceleration reference speed Ve, the acceleration change rate k1=Ve / t1 and the deceleration change rate k2=-Ve / t2 of the doffer are calculated.

[0022] In some embodiments of the present application, the acceleration time t1 and the deceleration time t2 are equal or unequal.

[0023] In some embodiments of the present application, after the speed change process is completed, the doffer maintains the target speed and the cotton feeding operation is normally controlled by the autoleveler.

[0024] In some embodiments of the present application, both the times T1 and T2 can be modified.

[0025] The present application also provides a control system for the weight of raw sliver during the speed change process of a carding machine, comprising:

[0026] A processing unit, which is used to receive a first working state instruction of switching from slow to fast speed and a second working state instruction of switching from fast to slow speed;

[0027] After receiving the first working state instruction, in each cotton feeding adjustment cycle c, according to the set doffer linear speed change curve, the reference speed of the doffer sp[n]=sp1+k1*c*n is calculated, sp[n] is greater than the current speed sp1 and less than or equal to the target speed sp2, and the reference speed sp[n] is sent to the autoleveling controller to control the cotton feeding operation until the speed change process is completed;

[0028] After receiving the second working state instruction, in each cotton feeding adjustment cycle c, according to the doffer linear speed change curve, the reference speed of the doffer sp'[n]=sp1'+k2*c*n is calculated, sp'[n] is less than the current speed sp1' and greater than or equal to the target speed sp2', and the reference speed sp'[n] is sent to the auto-leveling controller to control the cotton feeding operation until the speed change process is completed;

[0029] A first delay relay, which starts to change speed after a doffer delay time T1 after the processing unit receives the first working state instruction;

[0030] A second delay relay, which starts to change speed after a doffer delay time T2 after the processing unit receives the second working state instruction;

[0031] Each of the times T1 and T2 can make the reference speed corresponding to the cotton feeding amount reaching the doffer consistent with the doffer speed, n is the number of adjustments and n is a natural number greater than or equal to 1, k1 is the acceleration change rate of the doffer, and k2 is the deceleration change rate of the doffer.

[0032] In some embodiments of the present application, the control system includes:

[0033] The calculation unit calculates the acceleration change rate k1 and the deceleration change rate k2 of the doffer according to the doffer linear speed change curve.

[0034] In some embodiments of the present application, the acceleration change rate k1 and the deceleration change rate k2 of the doffer are calculated according to the doffer linear speed change curve, specifically:

[0035] According to the doffer linear speed change curve, acceleration time t1, and deceleration time t2, the acceleration and deceleration reference speed Ve is obtained;

[0036] According to the acceleration time t1, deceleration time t2 and the acceleration / deceleration reference speed Ve, the acceleration change rate k1=Ve / t1 and the deceleration change rate k2=-Ve / t2 of the doffer are calculated.

[0037] In some embodiments of the present application, the delayed times T1 and T2 can be modified.

[0038] Compared with the prior art, the method and system for controlling the weight of raw sliver during the speed change process of the carding machine provided in the present application have the following advantages and beneficial effects:

[0039] (1) During the speed change process, the cotton feed control and doffer control are linked, and the reference speed of the cotton feed control is adjusted according to the speed change rate of the doffer and the cotton feed adjustment time, and the doffer speed change is delayed, so that during the speed change process, the reference speed corresponding to the cotton feed amount reaching the doffer always corresponds to the doffer speed, ensuring the stability of the sliver weight and the quality of the sliver. The adjusted reference speed is equal to the current speed of the doffer until the reference speed is equal to the target speed of the doffer, and the speed change is completed, so that during the speed change process, the reference speed corresponding to the cotton feed amount reaching the doffer always corresponds to the doffer speed, ensuring the stability of the sliver weight and improving the sliver quality;

[0040] (2) No waste strips will be generated and no waste strip processing is required, thereby improving work efficiency and production efficiency.

[0041] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a schematic diagram of the structure of a carding machine;

[0044] Figure 2 It is a schematic diagram of the implementation of the first speed change mode of an embodiment of a method for controlling the weight of raw sliver in the speed change process of a carding machine production proposed by the present invention;

[0045] Figure 3 It is a schematic diagram for realizing the second speed change mode of an embodiment of a method for controlling the weight of raw slivers during the speed change process of a carding machine production proposed by the present invention. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0050] In order to achieve the control of the weight of the raw sliver during the speed change process of the carding machine, ensure the weight of the raw sliver, and improve the production efficiency, the present application proposes a method for controlling the weight of the raw sliver during the speed change process of the carding machine.

[0051] The control method involved in this application is implemented by using a control system.

[0052] See also Figure 2 and Figure 3 , Figure 2 A schematic diagram showing the implementation principle of the first speed change mode in the method for controlling the weight of the carded sliver during the speed change process of the carding machine; Figure 3 The present invention shows a schematic diagram of the implementation principle of the second speed change mode in the method for controlling the weight of raw sliver during the speed change process of the carding machine.

[0053] In the present application, each of the first speed change mode and the second speed change mode involves feed speed control and doffer speed control.

[0054] Among them, the cotton feeding speed control adopts the existing auto-leveler for auto-leveling control. This control method needs to introduce the speed of the doffer as a reference speed to control the cotton feeding speed, thereby adjusting the cotton feeding amount.

[0055] Therefore, in order to ensure that the reference speed corresponding to the cotton feeding amount reaching the doffer always corresponds to the doffer speed during the speed change process, it is necessary to introduce the speed change curve of the doffer, calculate the adjusted reference speed, and then calculate the cotton feeding speed.

[0056] The doffer speed change start is delayed so that the reference speed corresponding to the cotton feed amount output to the doffer using the cotton feed speed described above corresponds to the actual speed of the doffer after the speed change, ensuring the stability of the sliver weight. That is, the cotton feed speed, the corresponding reference speed, and the speed of the doffer correspond to each other.

[0057] When the carding machine is in a slow working state, a first working state instruction for switching to a fast working state is issued manually or automatically to execute a first speed change mode.

[0058] When the carding machine is in a fast working state, a second working state instruction for switching to a slow working state is issued manually or automatically to execute a second speed change mode.

[0059] The first speed change mode and the second speed change mode will be executed by the processing unit as follows.

[0060] First, see Figure 2 , the first speed change mode, that is, the speed change process from slow speed to fast speed of the carding machine will be described.

[0061] (1) Control of cotton feeding

[0062] If you want the reference speed corresponding to the cotton feeding amount reaching the doffer to correspond to the doffer speed, you need to understand the speed change curve of the doffer to increase the speed reaching the doffer in advance as the reference speed, so as to overcome the defect that the reference speed of the doffer speed collected in the prior art has a lag.

[0063] In the present application, the acceleration time t1 and the deceleration time t2 can be obtained according to the definition of the acceleration and deceleration time of the doffer driver.

[0064] According to the linear speed change curve, acceleration time t1 and deceleration time t2, the acceleration and deceleration reference speed Ve can be obtained. In this way, the acceleration change rate k1=Ve / t1 and the deceleration change rate k2=-Ve / t2 can be calculated.

[0065] It should be noted that the acceleration time t1 may refer to the time required to accelerate from the working speed (for example, zero) to the preset speed (in this case, the acceleration / deceleration reference speed Ve is the preset speed), or the time required for the working frequency of the doffer driver to rise from the working frequency (for example, zero frequency) to the preset working frequency (in this case, the acceleration / deceleration reference speed Ve is the speed at which the doffer driver drives the doffer at the preset working frequency), and so on.

[0066] Similarly, the deceleration time t2 can also be defined in the same way. The deceleration time t1 can refer to the time required to decelerate from a preset speed (in this case, the acceleration / deceleration reference speed Ve is the preset speed) to an operating speed (for example, zero), or the time required for the operating frequency of the doffer driver to decelerate from a preset operating frequency (in this case, the acceleration / deceleration reference speed Ve is the speed at which the doffer driver drives the doffer at the preset operating frequency) to an operating frequency (for example, zero frequency), and so on.

[0067] In the present application, the acceleration time t1 and the deceleration time t2 may be equal or different.

[0068] The acceleration / deceleration reference speed Ve involved is the speed at the completion of the acceleration phase and is also the speed at the beginning of the deceleration phase.

[0069] Before the first speed change mode is performed, the carding machine is in a slow working state, and the acceleration change rate k1=Ve / t1 is used at this time.

[0070] Set the current speed to sp1, the target speed to sp2, the reference speed to sp, and the feeding adjustment cycle of the autoleveler to c.

[0071] During the speed change process, the reference speed sp[n] adjusted for the nth time is:

[0072] sp[n]=sp1+k1*c*n=sp[n-1]+k1*c, n is a natural number greater than or equal to 1, and sp[0]=sp1.

[0073] Among them, sp[n] is greater than sp1 and less than or equal to sp2. If sp[n] is greater than sp[2], then sp[n]=sp2.

[0074] As mentioned above, in each cotton feeding adjustment cycle, the reference speed will be adjusted and then fed back to the self-adjusting leveler, so as to calculate the cotton feeding speed, control the cotton feeding operation, and achieve the purpose of adjusting the cotton feeding amount.

[0075] After the reference speed sp[n] is equal to sp2, the reference speed of the auto-leveler no longer changes until the speed change process is completed.

[0076] Afterwards, the cotton feeding operation is conventionally controlled by the autoleveler, that is, the autoleveling control mentioned in the prior art.

[0077] (2) Control over Dofu

[0078] The speed change control of the doffer starts after a delay time T1 relative to the cotton feeding speed change control described above, and before this, the doffer keeps running at a slow speed.

[0079] After that, the speed change control of the doffer and the cotton feeding speed change control are carried out simultaneously, and at the same time, the doffer changes speed according to its own linear speed change curve until the target speed sp2 is reached. The speed change process ends, and then the doffer maintains the target speed sp2.

[0080] The delay of time T1 is to accelerate the reference speed corresponding to the cotton feeding amount reaching the doffer in advance, so that the reference speed corresponds to the speed of the doffer after the speed change.

[0081] In the present application, the time T1 can be modified and can be manually adjusted according to the weight of the raw sliver generated during the operation of the carding machine to ensure that the weight of the raw sliver is stable.

[0082] Time T1 can be completed by starting the first delay relay.

[0083] At this point, the carding machine completes the speed change process from slow to fast, and the carding machine enters the fast working state.

[0084] As follows, see Figure 3 , the second speed change mode, that is, the speed change process from the carding machine fast speed to the full speed, will be described.

[0085] (1) Control of cotton feeding

[0086] If you want the reference speed corresponding to the cotton feeding amount reaching the doffer to correspond to the doffer speed, you need to understand the speed change curve of the doffer to reduce the speed reaching the doffer in advance as the reference speed, so as to overcome the defect that the reference speed of the doffer speed collected in the prior art has lag.

[0087] In the present application, before the second speed change mode is performed, the carding machine is in a fast working state, at which time the speed reduction change rate k2=-Ve / t2 is used.

[0088] Set the current speed to sp1', the target speed to sp2', the reference speed to sp', and the feeding adjustment cycle of the autoleveler to c.

[0089] During the speed change process, the reference speed sp'[n] adjusted for the nth time is:

[0090] sp'[n]=sp1'+k2*c*n=sp'[n-1]+k2*c, n is a natural number greater than or equal to 1, and sp'[0]=sp1'.

[0091] Among them, sp'[n] is less than sp1' and greater than or equal to sp2'. If sp'[n] is less than sp'[2], then sp'[n]=sp2'.

[0092] As mentioned above, in each cotton feeding adjustment cycle, the reference speed will be adjusted and then fed back to the self-adjusting leveler, so as to calculate the cotton feeding speed, control the cotton feeding operation, and achieve the purpose of adjusting the cotton feeding amount.

[0093] After the reference speed sp'[n] is equal to sp2', the reference speed of the autoleveler no longer changes until the speed change process is completed.

[0094] Afterwards, the cotton feeding operation is conventionally controlled by the autoleveler, that is, the autoleveling control mentioned in the prior art.

[0095] (2) Control over Dofu

[0096] The speed change control of the doffer starts after a delay time T2 relative to the cotton feeding speed change control described above. Before this, the doffer keeps running at a high speed.

[0097] Afterwards, the doffer speed change control and the cotton feeding speed change control are carried out simultaneously, and at the same time, the doffer changes speed according to its own linear speed change curve until the target speed sp2' is reached. The speed change process ends, and then the doffer maintains the target speed sp2'.

[0098] The delay of time T2 is to slow down the reference speed corresponding to the cotton feeding amount arriving at the doffer in advance, so that the reference speed corresponds to the speed of the doffer after the speed change.

[0099] In the present application, the time T2 can be modified and can be manually adjusted according to the weight of the raw sliver generated during the operation of the carding machine to ensure that the weight of the raw sliver is stable.

[0100] Time T2 can be completed by starting the second delay relay.

[0101] At this point, the carding machine completes the speed change process from fast to slow, and the carding machine enters the slow working state.

[0102] By the control method as described above, during the speed change process, the cotton feeding operation control and the doffer operation control are linked so that the reference speed corresponding to the cotton feeding amount reaching the doffer corresponds to the speed of the doffer after the speed change, thereby ensuring the stability of the raw yarn weight and avoiding the generation of waste yarn, thereby improving production efficiency.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A method for controlling the weight of carded sliver during the speed change process of a carding machine, characterized in that: include: The first speed change mode: receiving the first working state instruction of switching from slow speed to fast speed; In each cotton feeding adjustment cycle c, according to the set doffer linear speed change curve, the reference speed of the doffer sp[n]=sp1+k1*c*n is calculated, and sp[n] is greater than the current speed sp1 and less than or equal to the target speed sp2; The reference speed sp[n] is sent to the autoleveler controller to control the cotton feeding operation until the speed change process is completed; The speed change starts after the doffer delay time T1 until the speed change process is completed; the second speed change mode: receiving the second working state instruction of fast to slow speed; In each cotton feeding adjustment cycle c, according to the doffer linear speed change curve, the reference speed of the doffer sp'[n]=sp1'+k2*c*n is calculated, and sp'[n] is less than the current speed sp1' and greater than or equal to the target speed sp2'; The reference speed sp'[n] is sent to the autoleveler controller to control the cotton feeding operation until the speed change process is completed; The doffer starts to change speed after the delay time T2 until the speed change process is completed; Among them, each of the times T1 and T2 can make the reference speed corresponding to the cotton feeding amount reaching the doffer consistent with the doffer speed, n is the adjustment number and n is a natural number greater than or equal to 1, k1 is the acceleration change rate of the doffer, and k2 is the deceleration change rate of the doffer.

2. The method for controlling the weight of carded sliver during the speed change process of carding machine production according to claim 1, characterized in that: Calculate the acceleration change rate k1 and deceleration change rate k2 of the doffer, specifically: According to the doffer linear speed change curve, the acceleration time t1 and the deceleration time t2, the acceleration and deceleration reference speed Ve is obtained; According to the acceleration time t1, deceleration time t2 and the acceleration / deceleration reference speed Ve, the acceleration change rate k1=Ve / t1 and the deceleration change rate k2=-Ve / t2 of the doffer are calculated.

3. The method for controlling the weight of carded sliver during the speed change process of carding machine production according to claim 2, characterized in that: The acceleration time t1 and the deceleration time t2 are equal or unequal.

4. The method for controlling the weight of carded sliver during the speed change process of carding machine production according to claim 1, characterized in that: After the speed change process is completed, the doffer maintains the target speed and the cotton feeding operation is normally controlled by the autoleveler.

5. The method for controlling the weight of carded sliver during the speed change process of carding machine production according to claim 4, characterized in that: Both the times T1 and T2 can be modified.

6. A control system for the weight of carded sliver during the speed change process of carding machine production, characterized in that: include: A processing unit, which is used to receive a first working state instruction of switching from slow to fast speed and a second working state instruction of switching from fast to slow speed; After receiving the first working state instruction, in each cotton feeding adjustment cycle c, according to the set doffer linear speed change curve, the reference speed of the doffer sp[n]=sp1+k1*c*n is calculated, sp[n] is greater than the current speed sp1 and less than or equal to the target speed sp2, and the reference speed sp[n] is sent to the autoleveling controller to control the cotton feeding operation until the speed change process is completed; After receiving the second working state instruction, in each cotton feeding adjustment cycle c, according to the doffer linear speed change curve, the reference speed of the doffer sp'[n]=sp1'+k2*c*n is calculated, sp'[n] is less than the current speed sp1' and greater than or equal to the target speed sp2', and the reference speed sp'[n] is sent to the auto-leveling controller to control the cotton feeding operation until the speed change process is completed; A first delay relay, which starts to change speed after a doffer delay time T1 after the processing unit receives the first working state instruction; A second delay relay, which starts to change speed after a doffer delay time T2 after the processing unit receives the second working state instruction; Each of the times T1 and T2 can make the reference speed corresponding to the cotton feeding amount reaching the doffer consistent with the doffer speed, n is the number of adjustments and n is a natural number greater than or equal to 1, k1 is the acceleration change rate of the doffer, and k2 is the deceleration change rate of the doffer.

7. The control system for the weight of sliver during the speed change process of the carding machine according to claim 6, characterized in that: Also includes: The calculation unit calculates the acceleration change rate k1 and the deceleration change rate k2 of the doffer according to the doffer linear speed change curve.

8. The control system for the weight of sliver during the speed change process of the carding machine according to claim 7, characterized in that: According to the doffer linear speed change curve, the acceleration change rate k1 and deceleration change rate k2 of the doffer are calculated, specifically: According to the doffer linear speed change curve, acceleration time t1, and deceleration time t2, the acceleration and deceleration reference speed Ve is obtained; According to the acceleration time t1, deceleration time t2 and the acceleration / deceleration reference speed Ve, the acceleration change rate k1=Ve / t1 and the deceleration change rate k2=-Ve / t2 of the doffer are calculated.

9. The control system for the weight of sliver during the speed change process of the carding machine according to claim 6, characterized in that: The delayed times T1 and T2 can be modified.

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