Apparatus and method for making a mat from staple fibers

Abstract

The application discloses a short-cut fiber felt making equipment, which comprises a mesh belt conveying device provided with a spraying station, a discharging device, a forming device, a thickness detecting device for detecting the thickness of the felt on the spraying station and a material taking device arranged in sequence along the conveying direction of the mesh belt conveying device, characterized in that the discharging device comprises a slurry stirring device for providing felt making slurry, a slurry spraying device for spraying the felt making slurry on the spraying station, a spraying gun moving device for driving the slurry spraying device to move and a control system, and the spraying gun moving device comprises a Y moving mechanism arranged along the conveying direction of the mesh belt and an X moving mechanism arranged across the mesh belt. The application further provides a short-cut fiber felt making method. The equipment provided by the application can improve the uniformity and consistency of the surface thickness of the fiber felt, thereby obtaining high-quality short-cut fiber felt.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fiber mat making, and particularly relates to a short-cut fiber mat making equipment and a production method. BACKGROUND

[0002] Fibers are composed of continuous or discontinuous filaments, among which carbon fibers have the advantages of high stiffness, high tensile strength, low weight, high chemical resistance, high temperature resistance and low thermal expansion, and are widely used in aerospace, civil engineering and military.

[0003] Carbon fibers are often made into felt, and carbon fiber felt not only has the advantages of highly developed microporous structure, large adsorption capacity, fast desorption speed and good purification effect, but also has the advantages of wide adsorption universality, large capacity and small adsorption resistance, and is widely used.

[0004] At present, the process of the mat making process is more, which is sequentially divided into feeding, opening, feeding, carding, laying, pre-punching, lower punching, upper punching and rolling. However, the setting of feeding, carding, laying and needle punching frequency is completed by the experience of the operator, and even the most experienced operator cannot make the mat completely consistent every time.

[0005] Patent document CN112893040A discloses a spraying method based on uniformity, comprising the following steps: performing transverse single row spraying once on the test area of the profile; performing vertical laser thickness measurement on the sprayed single row to obtain a relationship data of a vertical position and a coating thickness; the relationship data is placed on the coordinate axis, and a curve is obtained by fitting the data points; the curve establishes a normal distribution model according to the normal distribution rule, obtains the spraying distance s between the two adjacent spray guns after overlapping spraying, and ensures the thickness of the superimposed coating is the same; according to the length L1 of the profile and the movement speed V1 of the spray gun, the cycle T1 of the spray gun is obtained; according to the number n of the spray guns, the distance h from the spray gun to the profile, and the spray angle 2θ of the spray gun, the width D that can be sprayed by n spray guns at a time is obtained, and then the spraying time T2 of each profile is obtained, wherein V2 is the movement speed of the profile; according to the spraying cycle m of the spray gun, the time T1 of the spray gun returning once, and the spraying time T2 of each profile, the profile is sprayed to obtain a coating with uniform thickness. This method controls the spray angle of the spray gun and sets the normal distribution model for spraying, but this method is only applicable to ideal state, and the data precision of the equipment is required to be high.

[0006] Patent document CN105499025A discloses a reciprocating automatic spraying machine, comprising a rack (1) and a gun rack (2) provided with a spray gun (3) and a guide rail (4); the gun rack (2) is arranged on the rack (1), characterized in that the guide rail (4) is provided with a swing head device (5) moving reciprocally along the guide rail (4), and the spray gun (3) is rotatably connected to the swing head device (5) along the moving direction of the swing head device (5); the swing head device (5) comprises a second driving machine, the second driving machine is connected to the spray gun (3) through a swing shaft (8) and controls the rotation of the spray gun (3); in the acceleration and deceleration stage, the second driving machine controls the spray gun (3) to rotate synchronously around a base point of the swing shaft (8) with a preset angular acceleration, the rotation direction is consistent with the translation direction of the swing head device (5), and there is a corresponding included angle between the spray gun (3) and a vertical line when the swing is terminated; wherein the rack (1) is further provided with a controller (6) for driving the swing head device (5) to move horizontally and linearly along the guide rail (4) through a first driving machine (7), and controlling the spray gun (3) to swing or reset when the swing head device (5) changes in translation speed. The method has the problem that the motor is started, stopped and turned in the process of pulling back the spray head for spraying, and the profile thickness is not uniform due to the change in speed. SUMMARY

[0007] The present application aims to provide a short-cut fiber felt making equipment and production method, which can improve the uniformity and consistency of the fiber felt surface thickness, thereby obtaining high-quality short-cut fiber felt.

[0008] In order to achieve the first object of the present application, a short-cut fiber felt making equipment is provided, comprising a mesh belt conveying device provided with a spraying station, and a discharging device, a forming device, a thickness detecting device for detecting the thickness of the felt, and a taking device arranged in sequence along the conveying direction of the mesh belt conveying device; the discharging device comprises a slurry stirring device for providing felt-making slurry, a slurry spraying device for spraying the felt-making slurry on the spraying station, a spray gun moving device for driving the slurry spraying device to move, and a control system; the spray gun moving device comprises a Y moving mechanism arranged along the conveying direction of the mesh belt conveying device and an X moving mechanism arranged across the mesh belt conveying device; the control system adjusts the spraying speed of the slurry spraying device according to the detected felt thickness and the moving speed of the X moving mechanism, so as to complete uniform spraying.

[0009] The present application adjusts the spraying speed according to the moving speed of the X moving mechanism, and further adjusts the spraying speed by compensating the moving speed of the slurry spraying device according to the current felt thickness, so as to realize uniform spraying of the felt.

[0010] Specifically, the X moving mechanism comprises an X shaft motor, an X shaft speed reducer, an X shaft driver, and an X shaft driving screw and nut. The input end of the X shaft speed reducer is mechanically connected with the X shaft motor, and the output end of the X shaft speed reducer is mechanically connected with the X shaft driving screw and nut. The X shaft driver drives the X shaft motor to move. The X shaft driver controls the X shaft motor to move a fixed length by position mode control. The movement of the X shaft is controlled by the displacement signal sent by the X shaft driver.

[0011] Specifically, the Y moving mechanism comprises a Y shaft motor, a Y shaft speed reducer, a Y shaft driver, and a Y shaft driving screw and nut. The Y shaft driver drives the Y shaft motor to move. The Y shaft driver controls the Y shaft motor to move a fixed length by position mode control. The movement of the Y shaft is controlled by the displacement control signal sent by the Y shaft driver.

[0012] Specifically, the mesh belt conveying device comprises a ring type mesh belt and a driving mechanism for providing the ring type mesh belt with annular rotation.

[0013] Specifically, the driving mechanism comprises a mesh belt motor, a mesh belt speed reducer, and a mesh belt driver. The mesh belt driver drives the mesh belt motor and the mesh belt speed reducer to drive the annular mesh belt to move in an annular rotation.

[0014] Specifically, the slurry stirring device comprises a barrel and a stirring mechanism arranged in the barrel. The stirring mechanism comprises a stirring motor, a stirring speed reducer, a stirring frequency converter, a stirring shaft, and stirring blades. The stirring frequency converter is used to adjust the output of the stirring motor. The output end of the stirring motor is connected with the stirring shaft through the stirring speed reducer. The stirring shaft drives the stirring blades to mix and stir the felt-making slurry in the barrel.

[0015] Specifically, the slurry spraying device comprises a spray gun for spraying the felt-making slurry, a spraying motor for inputting the felt-making slurry into the spray gun, and a spraying driver for controlling the output speed of the spraying motor to complete the variable-speed spraying action. A spraying speed reducer is arranged between the spray gun and the spraying motor.

[0016] Specifically, the spraying speed of the slurry spraying device is generated by real-time collection of the current speed of the X moving mechanism and combination of constant terms constructed according to the mechanical characteristics of the short-cut fiber felt-making equipment.

[0017] Specifically, the mechanical characteristics of the short-cut fiber felt-making equipment comprise the driving screw pitch of the X shaft motor, the speed reduction ratio of the X shaft speed reducer, the nozzle diameter of the spraying motor, the speed reduction ratio of the spraying speed reducer, and the diameter of the coating delivery pipeline.

[0018] Specifically, the expression of the spraying speed is as follows:

[0019] Vz=k*v(x t )

[0020] Wherein, v(x t ) represents the current speed of the X moving mechanism at the xth point in the X axis direction at time t, k represents a constant term, and Vz represents the output speed of the injection motor in the slurry injection device.

[0021] Specifically, the current speed v(x t ) value of the X axis motor is collected in real time during the spraying process, the current speed v(x t ) of the X axis motor is calculated accordingly, the control speed Vz=k*v(x t ) of the injection motor is calculated, the rotation speed Vz of the injection motor is refreshed in real time, the rotation speed of the injection motor is slow when the rotation speed of the X axis motor is slow, the discharge amount of the nozzle of the slurry injection device per unit time is small, the rotation speed of the injection motor is fast when the rotation speed of the X axis motor is fast, and the discharge amount of the nozzle of the slurry injection device per unit time is large; the phenomenon that the coating becomes thick when the X axis runs slowly and the coating becomes thin when the X axis runs fast due to speed change during the reciprocating motion of the X motor is effectively overcome, and the uniformity and consistency of the surface thickness of the fiber felt are improved.

[0022] Specifically, the slurry injection device compensates the moving speed of the X moving mechanism according to the difference between the preset felt thickness and the felt thickness collected by the thickness detection device in real time according to the current speed and the preset felt thickness.

[0023] Specifically, the expression of the compensation is as follows:

[0024] v(x t+T ) = v(x t ) + v(Δh(x t ))

[0025] v(Δh(x t )) = k1*Δh(x t )

[0026] Wherein, Δh(x) represents the difference between the preset felt thickness and the felt thickness collected by the thickness detection device in real time, k1 represents the speed compensation coefficient, v(Δh(x t )) represents the compensation value of the X moving mechanism at the xth point in the X axis direction, v(x t ) represents the current speed of the X moving mechanism at the xth point in the X axis direction at time t, and v(x t+T ) represents the speed of the X moving mechanism at the xth point in the X axis direction after compensation in one update period, and the current speed is updated by real-time speed compensation calculation with a preset update period T.

[0027] Specifically, the thickness data h(x t) and feedback to the control system in real time; the control system calculates the difference Ah(x) between the felt thickness setting data h and the thickness detection data h(x) t ) = h - h(x t ), and compensates the speed of the X-axis motor at position x point according to Ah(x t ), the speed compensation value v(Ah(x t )) is proportional to the thickness difference Ah(x); v(Ah(x t )) = k1*Ah(x t ), k1 is the speed compensation coefficient: when Ah(x t )>0, the detected thickness of the felt at position x point is less than the required thickness h of the felt, the speed compensation value v(Ah(x t ))>0, the slurry output per unit time is increased by increasing the speed of the slurry injection motor of the slurry injection device; when Ah(x t )<0, the detected thickness of the felt at position x point is greater than the required thickness h of the felt, the speed compensation value v(Ah(x t ))<0, the slurry output per unit time of the injection device is reduced by reducing the injection speed.

[0028] Specifically, the forming device comprises an infrared heating block, a temperature sensor, a solid-state relay and a temperature controller, that is, the felt slurry after spraying at the spraying station is conveyed to the forming station by the mesh belt conveying device for heating and drying to form the felt.

[0029] Specifically, the material taking device sends the felt from the thickness detection station to the discharging station through the mesh belt conveying device, and the felt is carried to the specified position for storage by the mechanical hand of the discharging station.

[0030] Specifically, the main components of the control system include PLC, touch screen, X-axis motor and X-axis driver, Y-axis motor and Y-axis driver, injection motor and injection driver, intermediate relay and contactor; the control system controls the orderly work of the production line.

[0031] In order to realize the second object of the application, a short-cut fiber felt production method is provided, which is realized by the short-cut fiber felt equipment, and comprises the following steps:

[0032] The felt slurry mixed with the short-cut fiber is provided to the slurry injection device by the slurry stirring device, and is sprayed to the spraying station on the conveying belt by the slurry injection device, and the spraying layer is heated and dried by the forming device to form the felt;

[0033] The thickness of the felt in the X direction is detected by the thickness detection device, and the thickness is fed back to the control system for spraying thickness compensation;

[0034] The coated felt is transported to a designated location for storage using a material handling device.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] By real-time acquisition of the current speed v(x) of the X-axis motor t The value, and the current speed v(x) of the X-axis motor. t The control speed Vz of the jet motor is obtained by calculating the value. The PLC refreshes the rotation speed Vz of the jet motor in real time, which effectively overcomes the phenomenon that the coating becomes thicker when the X-axis is running slowly and thinner when the X-axis is running fast due to speed changes during the reciprocating motion of the X motor, and improves the uniformity and consistency of the fiber felt surface thickness.

[0037] Simultaneously, the felt thickness is measured by laser in the X direction to obtain the felt thickness data h(x) corresponding to the position x. t And put h(x) t The data is fed back to the control system in real time, and the control system calculates the felt thickness setpoint h and the detection data h(x). t The difference Δh(x) t )=hh(x t ), and according to Δh(x t The speed of the X-axis motor at position x is compensated. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a short fiber felt-making device provided in this embodiment;

[0039] Figure 2 This is a top view of a chopped fiber felting apparatus provided in this embodiment;

[0040] Figure 3 This is a schematic diagram of the slurry injection device provided in this embodiment;

[0041] Figure 4 This is a schematic diagram of the spray gun moving device provided in this embodiment;

[0042] Figure 5 This is the motion trajectory of the spray gun during the spraying process provided in this embodiment. Detailed Implementation

[0043] like Figure 1 and Figure 2The diagram shown is a structural schematic of the chopped fiber felt-making equipment provided in this embodiment. It includes a mesh belt conveyor (a), a slurry mixing device (b), a slurry spraying device (c), a spray gun moving device (d), a forming device (f), a thickness detection device (g), a material handling device (h), and its control system. The mesh belt conveyor (a) is divided into four stations along its forward direction: spraying station (e1), forming station (e2), thickness detection station (e3), and unloading station (e4). The slurry mixing device (b), slurry spraying device (c), and spray gun moving device (d) are assigned to the spraying station (e1), the forming device (f) to the forming station (e2), the thickness detection device (g) to the thickness detection station (e3), and the material handling device (h) to the unloading station (e4).

[0044] The slurry mixing device b is arranged above the mesh belt conveyor a. It is used to store the slurry and chopped fibers required for felt making and to uniformly mix the slurry and chopped fibers. The main components include a mixing motor b1, a mixing reducer b2, a mixing frequency converter, a mixing shaft and mixing blades b3. The input end of the mixing reducer is mechanically connected to the mixing motor, and the output end is mechanically connected to the mixing shaft. The mixing frequency converter drives the mixing motor b1 to drive the mixing reducer b2, the mixing shaft and the mixing impeller b3 to mix the chopped fibers and slurry in the material bucket b4, so as to provide a uniform and stable slurry for the slurry spraying device c.

[0045] The slurry injection device c is fixed on the spray gun moving device d, and the spray gun inlet of the slurry injection device d is connected to the outlet of the slurry mixing device b through a hose b5.

[0046] The mesh belt conveyor a includes a mesh belt motor a0, a mesh belt reducer a1, a mesh belt drive shaft a2, a mesh belt driven shaft a3, and an annular mesh belt a4; the mesh belt motor a0 is mechanically connected to the mesh belt reducer a1, and the mesh belt driver drives the mesh belt motor a0 and the mesh belt reducer a1 to drive the annular mesh belt a4 to perform annular rotational motion.

[0047] like Figure 3 As shown, the slurry injection device c includes an injection motor c0, an injection driver, and an injection reducer c1. The injection motor c0 and the injection reducer c1 are mechanically connected. The injection driver uses a speed control mode to drive the slurry to be injected from the nozzle c2. The injection speed of the injection motor c0 is controlled by the speed control command sent by the injection driver.

[0048] like Figure 4As shown, the spray gun moving device d includes an X-axis moving mechanism and a Y-axis moving mechanism. The X-axis moving mechanism is mechanically bonded above the Y-axis moving mechanism, and the Y-axis moving mechanism drives the X-axis moving mechanism to move in the Y direction. The X-axis moving mechanism mainly includes an X-axis motor d10, an X-axis reducer d11, an X-axis driver, and an X-axis drive screw and nut d12. The input end of the X-axis reducer d11 is mechanically connected to the X-axis motor d10, and the output end of the X-axis reducer d11 is mechanically connected to the X-axis drive screw and nut d12. The X-axis driver drives the X-axis motor d10 to move. The X-axis driver uses a position mode to control the X-axis motor d10 to move a fixed length. The amount of movement of the X-axis is controlled by the displacement signal sent by the X-axis driver. The Y-axis moving mechanism mainly includes a Y-axis motor d20, a Y-axis reducer d21, a Y-axis driver, and a Y-axis drive screw and nut d22. The Y-axis driver drives the Y-axis motor d20 to move. The Y-axis driver uses a position mode to control the Y-axis motor d20 to move a fixed length. The amount of movement of the Y-axis is controlled by the displacement control signal sent by the Y-axis driver.

[0049] like Figure 5 The diagram shown is a schematic of the path of the spray gun of the slurry spraying device moving back and forth in the X and Y directions in the spraying area in this embodiment.

[0050] The X-axis motor d10 uses position control mode, and the spray motor c0 uses speed control mode; the PLC collects the current speed v(x) of the X-axis motor in real time during the spraying process. t The value, and the current speed v(x) of the X-axis motor. t The control speed of the injection motor, Vz = k * v(x), is calculated accordingly. t The coefficient k is determined by the mechanical characteristics of the equipment. The volume of slurry sprayed by the spray motor per unit time is equal to the volume of slurry sprayed by the spray gun through the moving device onto the conveyor belt spraying station; v2*i2 / n2=n1*i1*p1*w*h*k; the rated speed of the X-axis motor is n1=3000 rpm, the pitch of the drive screw is p1=10mm, the gear ratio of the X-axis reducer is i1=1:30, the drive part of the 20CQ-12p pump is replaced by a spray motor and a spray reducer, the gear ratio of the spray reducer is i2=1:10, the pump inlet diameter is 20mm, the outlet diameter is 14mm, the pump head is 12 meters, the nozzle diameter connected to the pump is selected as 5mm, the spray width is w=20mm, the thickness of a single spray is h=0.1mm, the speed is n2=1400 rpm, the pump flow rate is v2=50000 cubic millimeters, k=Vz / v(x t )=(v2*i2 / n2) / (n1*i1*p1*w*h)=[50000 / (5*1440)] / (3000*10*20*0.1 / 30)=1 / 144;

[0051] The thickness detection device uses a laser to detect the thickness of the felt produced at the forming station in the X direction, obtains the thickness data, and feeds it back to the control system in real time. The control system calculates the felt thickness set data h and the thickness detection data h(x). t The difference Δh(x) t )=hh(x t ), and according to Δh(x t The speed of the X-axis motor at position x is compensated, and the speed compensation amount is v(Δh(x)). t The difference between the thickness Δh(x) and the thickness difference t Proportional; v(Δh(x) t ))=k1*Δh(x t Considering the stability of the felt thickness due to thickness compensation, the speed compensation coefficient k1 is 1 / 2, and the update cycle T of the control system is the actual scan cycle of the PLC program, which is 500ms.

[0052] In this embodiment, the spraying speed is adjusted first, and then the speed compensation for thickness detection is performed.

[0053] This allows the slurry spraying device to spray the slurry from the slurry mixing device into the coating area of ​​the mesh belt conveyor in an orderly and controllable manner through the spray gun.

[0054] The material handling device h takes the felt from the thickness detection station e4 and sends it to the unloading station via the mesh belt conveyor a. The robotic arm h1 at the unloading station then transports it to the storage area m for storage.

[0055] The control system controls the X-axis motor, X-axis driver, Y-axis motor, Y-axis driver, jet motor, jet driver, and other components to work in an orderly and controllable manner.

[0056] This embodiment also provides a method for producing felt from chopped fiber, which is achieved using the chopped fiber felting equipment provided in the above embodiment, and includes the following steps:

[0057] 1. At the spraying station: The slurry spraying device sprays the slurry mixed with short-cut fibers onto the spraying area of ​​the mesh belt conveyor under the drive of the spray gun moving device.

[0058] 2. At the forming station: The coating material from the spraying area is conveyed to the forming station via a mesh belt conveyor for heating and drying to form felt;

[0059] 3. Thickness Inspection Station: The felt conveyed from the forming station via a mesh belt is subjected to laser inspection to obtain the thickness h(x) of the felt in the X direction. t ), the thickness h(x) t The feedback is sent to the control system to compensate for the coating thickness.

[0060] 4. The blanking station: the felt conveyed from the thickness detection station by the mesh belt conveying device is carried to the designated position by the mechanical hand for storage;

[0061] The size of the felt product is related to the movement distance of the spray gun in X and Y directions, and the movement track of the spray gun is realized by alternately walking the X and Y axis motors. The thickness of the felt is realized by controlling the spraying times.

[0062] In addition, the terms "upper", "lower", "inner", "outer", "front", "back" are only used for description purposes, and cannot be understood as indicating or implying relative importance. Unless otherwise specified, the relative steps, numerical expressions and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0063] Of course, the above only describes specific embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes or modifications made in accordance with the structure, features and principles described in the patent application of the present application shall be included in the patent application of the present application.

[0064] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the scope of the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any skilled person in the art can make modifications or easily think of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present application, or make equivalent substitutions for some technical features. The modifications, changes or substitutions do not change the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A chopped fiber felt-making equipment, comprising a mesh belt conveyor with a spraying station, a discharge device, a forming device, a thickness detection device for detecting the felt thickness, and a material handling device arranged sequentially along the conveying direction of the mesh belt conveyor, characterized in that... The discharge device includes a slurry stirring device for providing felt-making slurry, a slurry spraying device for spraying the felt-making slurry onto the spraying station, a spray gun moving device for driving the slurry spraying device, and a control system. The spray gun moving device includes a Y-moving mechanism arranged along the conveying direction of the mesh belt conveyor and an X-moving mechanism arranged across the mesh belt conveyor. The control system adjusts the spraying speed of the slurry spraying device based on the detected felt thickness and the movement speed of the spray gun moving device to achieve uniform spraying. The spraying speed of the slurry spraying device is generated by real-time acquisition of the current speed of the X-moving mechanism and a constant term constructed by combining the mechanical characteristics of the chopped fiber felting equipment. The spraying speed is expressed as follows: ;in, This represents the current velocity of the X-moving mechanism at point x in the X-axis direction at time t, where k represents a constant term. This indicates the output speed of the spraying motor and the spraying speed in the slurry spraying device. The slurry spraying device compensates for the moving speed of the X-moving mechanism based on the difference between the preset felt thickness and the felt thickness collected in real-time by the thickness detection device, according to a preset control system update cycle T. The update cycle T of the control system is the scan cycle of the PLC program. The expression for the compensation is as follows: ; ;in, This represents the difference between the preset felt thickness and the felt thickness collected in real time by the thickness detection device, where k1 represents the speed compensation coefficient. This represents the compensation value of the X-moving mechanism at point x in the X-axis direction. This represents the current velocity of the X-moving mechanism at point x in the X-axis direction at time t. This represents the compensated speed of the X-moving mechanism at point x in the X-axis direction after one update cycle.

2. The short-fiber felt-making equipment according to claim 1, characterized in that, The conveyor belt includes a ring-shaped conveyor belt and a drive mechanism that enables the ring-shaped conveyor belt to rotate in a ring.

3. The short-fiber felt-making equipment according to claim 1, characterized in that, The slurry mixing device includes a material cylinder and a mixing mechanism disposed inside the material cylinder. The mixing mechanism includes a mixing motor, a mixing reducer, a mixing frequency converter, a mixing shaft, and mixing blades. The output of the mixing motor is adjusted by the mixing frequency converter. The output end of the mixing motor is connected to the mixing shaft through the mixing reducer. The mixing shaft drives the mixing blades to mix and stir the felt-making slurry in the material cylinder.

4. The short-fiber felt-making equipment according to claim 1, characterized in that, The slurry injection device includes a spray gun for spraying felt-making slurry, a spray motor for inputting the felt-making slurry into the spray gun, and a spray driver for controlling the output speed of the spray motor to complete the variable speed spraying action. A spray reducer is provided between the spray gun and the spray motor.

5. A method for producing felt from chopped fibers, characterized in that, This is achieved using the short-fiber felting apparatus as described in any one of claims 1 to 4, comprising the following steps: The slurry mixed with short-cut fibers is supplied to the slurry spraying device through the slurry mixing device, and the slurry is sprayed onto the spraying station on the mesh belt conveyor through the slurry spraying device. The sprayed layer is heated and dried by the forming device to make felt. The thickness of the felt in the X direction is detected by a thickness detection device, and the thickness is fed back to the control system for coating thickness compensation. The coated felt is transported to a designated location for storage using a material handling device.

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