A speed control mechanism for synchronizing the forward speed of a steel strand with the rotation speed of an opening and closing mechanism and a steel strand spraying production line containing the mechanism

Abstract

The present invention relates to a speed control mechanism for synchronizing the forward speed of a steel strand with the rotation speed of an opening and closing mechanism and a steel strand spraying production line containing the mechanism. The speed control mechanism comprises an encoder, a support frame, a rotating shaft, a follower turntable and a plurality of groups of pressure wheel assemblies. The rotating shaft is movably mounted on the support frame, the rotating inner ring of the encoder is mounted on one end of the rotating shaft, the follower turntable is mounted on the other end of the rotating shaft, each group of pressure wheel assemblies comprises a wheel rod fixing seat, a spring, a wheel rod and a pressure wheel, the wheel rod fixing seat is fixed on the follower turntable, the wheel rod is composed of a mounting rod and a pressure wheel mounting groove seat, the pressure wheel is mounted in the pressure wheel mounting groove seat, the wheel rod is sleeved in the wheel rod fixing seat, and the spring is mounted between the wheel rod fixing seat and the pressure wheel mounting groove seat. The speed control mechanism does not need to adjust parameters manually, and can always automatically collect signals by its own structure to ensure that the forward speed of the steel strand is synchronized with the rotation speed of the opening and closing mechanism, thereby reducing labor costs and improving safety factors and production efficiency.

Description

Technical Field

[0001] The invention relates to a speed control mechanism in which the advancing speed of a steel strand is synchronized with the rotating speed of an opening and closing mechanism and a steel strand spraying production line containing the mechanism. Background Art

[0002] The monofilament epoxy spray steel strand is formed by spraying epoxy powder on the smooth steel strand. In the production process of the monofilament epoxy spray steel strand, the seven smooth steel strands that are spun into a bundle need to be opened to form seven parallel monofilament steel strands, so that each strand can be powdered separately in the electrostatic epoxy spray cabinet. After the seven steel strands are powdered, the seven steel strands with epoxy coating on the outer layer that have been stabilized and cooled need to be re-spun into a bundle to become the finished monofilament epoxy spray steel strand.

[0003] Partial schematic diagram of the monofilament epoxy spray steel strand production line Figure 1 and Figure 2 shown. Figure 1 and Figure 2 The attached figure includes five parts: the scattering mechanism, the preheating zone, the spraying zone, the cooling zone, and the closing mechanism. The steel strand must be scattered into parallel steel wires between the scattering mechanism and the closing mechanism, because in the spraying area (spraying cabinet) and cooling area of ​​the single-filament epoxy spray steel strand, the steel strand can only be opened into seven separate parallel steel wires, so that each steel wire can be sprayed, and at the same time, the steel strands after powder coating are prevented from contacting each other before cooling, causing powder rubbing and powder falling. In this way, the scattering mechanism and the closing mechanism play a vital role in the spraying and cooling links of the single-filament epoxy spray steel strand, and are the most important factors in determining whether the epoxy powder is normally coated and whether the powder is damaged by contact before cooling.

[0004] ∅15.2 and ∅15.7 steel strands are made of seven steel strands, the straight wire in the center is the center wire, and the six spiral steel wires evenly distributed on the circumference of the center wire and spirally wrapped around the center wire are the outer wires. The pitch and spiral diameter of the spiral outer wire are formed by the smooth steel strands extruded and stabilized by the die during production, and the pitch and spiral number remain unchanged after the steel strands are formed. Such steel strands determine that when the steel strands pass through the scattering mechanism and the closing mechanism, the scattering mechanism and the closing mechanism will rotate one circle for each distance of a steel strand spiral passing through the mechanism. If the number of circles rotated by the scattering mechanism and the closing mechanism is not equal to the number of steel strand spirals passing through the mechanism, the six outer spiral steel wires will be over-twisted or under-twisted, which will cause the outer wires to deform, thereby affecting the production of single-filament spray epoxy steel strands. Therefore, only when the number of rotations of the scattering mechanism and the closing mechanism is adjusted to be exactly equal to the number of spiral turns of the steel strand passing through the area, can the monofilament epoxy spray steel strand be produced normally. In the production line of monofilament epoxy spray steel strand, the rotation of the scattering mechanism and the closing mechanism is driven by the motor, so controlling the rotation speed of the motor to be in an appropriate proportion to the forward speed of the steel strand passing through can ensure that the number of rotations of the scattering mechanism and the closing mechanism is equal to the number of spiral turns of the steel strand passing through the area.

[0005] At present, there are two forms of motor speed control methods in the production line of single-filament epoxy sprayed steel strands. One is to control and adjust the motor rotation speed through the speed regulator, and the other is to measure the forward speed of the steel strand through the encoder, and use the signal output by the encoder as the basic input signal (base) of the servo motor speed, and then substitute the basic signal (base) into the calculation formula to calculate the rotation speed of the servo motor. These two motor speed control and adjustment methods have the following characteristics.

[0006] 1. Speed ​​regulation of the speed regulator: The speed regulation of the speed regulator is to adjust the motor rotation speed directly by hand. When the forward speed of the steel strand changes, the motor rotation speed needs to be adjusted manually until the number of rotations per unit time of the motor-driven dispersing mechanism and closing mechanism is equal to the number of spirals per unit time of the steel strand. The disadvantage of this adjustment method is that it is impossible to adjust the motor speed to match the forward speed of the steel strand 100% (when the steel strand advances one spiral length, the motor-driven dispersing mechanism and closing mechanism rotate exactly one circle). Under normal circumstances, experienced masters can only adjust the speed to be infinitely close to the fully matched speed. In this case, as production progresses, the speed error slowly accumulates, which will cause the braiding point of the steel strand to move in a certain direction. When the motor speed is faster than the motor speed when it is fully matched, the steel strand braiding points at the scattering mechanism and the closing mechanism (collectively referred to as the opening and closing mechanism) move in the opposite direction of the steel strand's forward direction. When the motor speed is slower than the motor speed when it is fully matched, the steel strand braiding points at the scattering mechanism and the closing mechanism (collectively referred to as the opening and closing mechanism) move in the direction of the steel strand's forward direction. Regardless of whether the actual motor speed is faster or slower than the motor speed when fully matched, it will cause the braiding point of the steel strand to move. No matter in which direction the braiding point moves (the moving directions of the two braiding points are always the same), one of the braiding points will gradually move toward the turntable on the dispersing mechanism or the closing mechanism (collectively referred to as the opening and closing mechanism). When the braiding point of the steel strand gradually moves toward the turntable on the dispersing mechanism or the closing mechanism, the opening angle of the six external wires at the braiding point will gradually increase. At this time, the tension on the external wires will also gradually increase. If it is allowed to continue to move toward the turntable, the six external wires will break due to excessive tension, thereby forcing the production of single-filament epoxy spray-coated steel strands to be stopped. In actual production, we cannot adjust the motor speed to a rotation speed that fully matches the forward speed of the steel strand, but we can judge whether the speed is faster or slower than the speed when it is fully matched by the moving direction of the weaving point. In this way, we can reasonably modify the motor speed so that the weaving point moves back and forth within a safe range (the safe distance between the weaving point and the turntable) to ensure normal production.

[0007] 2. Speed ​​control method with base number substituted into the calculation formula: The speed control method with base number substituted into the calculation formula is to multiply the signal output by the encoder (encoder speed) by the constant value in the calculation formula to obtain the output speed of the servo motor. This speed control method uses two base numbers to calculate the operating speed of the servo motor. Base number one is the signal output by the encoder (encoder speed), and base number two is the constant value in the calculation formula. Compared with the speed control of the speed regulator, when the speed of the steel strand changes, the base number one (encoder speed) will also change proportionally accordingly. In this way, the speed of the servo motor obtained by multiplying the proportional change by the constant value will also change proportionally, and then the speed of the turntable will also change proportionally, so that no matter how the speed of the steel strand changes, the speed of the turntable will always change proportionally with it, achieving the effect of automatic speed regulation.

[0008] From the existing structure diagram ( Figure 3-Figure 4 ) It can be seen that the linear velocity v of the steel strand is 钢绞线 The U-shaped groove line speed v of the turntable 转盘 Similarly, the turntable is connected to the encoder rotating inner hole through the shaft, so the angular velocity of the turntable ω 转盘 The angular velocity ω of the encoder 编码器 same.

[0009] The formula is as follows:

[0010]

[0011] Condition: The steel strand advances one spiral length and the opening and closing mechanism rotates one circle;

[0012]

[0013] Where: v 钢绞线 Indicates the linear speed of the steel strand;

[0014] v 转盘 Indicates the linear velocity of the turntable arc slot at the nearest center;

[0015] ω 转盘 represents the angular velocity of the turntable;

[0016] ω 编码器 Indicates the angular velocity of the encoder;

[0017] r 转盘 Indicates the radius of the circle closest to the center of the arc slot of the turntable;

[0018] t represents time;

[0019] p 螺旋 Indicates the length of one spiral distance of the six outer wires of the steel strand.

[0020] From the above calculation formula, it can be seen that the rotation speed ω of the opening and closing mechanism under the condition of speed synchronization is 开合机构 =(2π×v 钢绞线 )÷p 螺旋 In this formula, v 钢绞线 It is through v 钢绞线 =ω 编码器 × 转盘 Calculated, p 螺旋 The length of one spiral distance of the six outer wires of the steel strand is measured, and the π in 2π is the constant value π. Through this calculation formula, it can be known that in order to obtain the correct rotation speed ω of the opening and closing mechanism 开合机构 , need v 钢绞线 With p 螺旋 are all correct actual values. However, by calculating the formula v 钢绞线 =ω 编码器 × 转盘 It can be seen that the v calculated by this formula is 钢绞线 There is always a certain error with the correct value of the steel strand forward speed. The reason is: 钢绞线 =ω 编码器 × 转盘 ω in the formula 编码器 It is the value obtained by processing the photoelectric signal of the encoder shaft when it rotates. This value is the true value, but the r 转盘 There is a slight error between the value of and the value of the distance from the point where the steel strand and the U-shaped groove of the turntable touch each other to the center of the turntable when the steel strand moves forward (the steel strand is not circular in shape, it is wound by six outer wires to form a circle close to the circle. When the steel strand moves forward, the point where it touches the U-shaped groove moves on the arc of the U-shaped groove, causing the distance from the contact point to the center of the turntable to change within a certain range. Therefore, the distance from the contact point to the center of the turntable is different from the r defined by the formula. 转盘 The calculated v 钢绞线 There is always a slight error with the actual forward speed of the strand. 钢绞线 In addition, the artificially measured p 螺旋 There is also a certain error between the actual spiral length of the steel strand and the actual value, so these two values ​​with errors in the actual value are substituted into ω 开合机构 =(2π×v 钢绞线 )÷p 螺旋 The ω calculated in the calculation formula 开合机构 With the correct ω 开合机构There is an error, which causes the opening and closing mechanism to not really achieve the effect of synchronizing its rotation speed with the speed of the steel strand. Therefore, in the actual working process, we can only judge whether the speed of the turntable is faster or slower than the theoretical rotation speed by the moving direction of the weaving point to correct the speed of the turntable. For example, in the production process, the operator observes that the steel strand weaving point moves in the direction of the steel strand, then he knows that the rotation speed of the opening and closing mechanism is slower than the theoretical rotation speed of the opening and closing mechanism. At this time, he needs to change the formula ω 开合机构 =(2π×v 钢绞线 )÷p 螺旋 Medium 螺旋 The value of is reduced, so that ω 开合机构 The speed increases to reach ω 开合机构 The purpose is to adjust the rotation speed to the same as the theoretical rotation speed of the opening and closing mechanism.

[0021] From the above principle discussion, it can be known that the rotation speed adjustment mechanisms of the above two opening and closing mechanisms need manual observation and adjustment to make their rotation speed gradually close to their theoretical rotation speed. The control method has great risks and difficulties. When the operator is not careful, the rotation speed of the opening and closing mechanism may deviate greatly from the theoretical rotation speed, causing the steel strand braiding point to move rapidly, resulting in the steel strand being cut or strangled, and the opening and closing mechanism being pulled in the direction of the steel strand movement. Summary of the invention

[0022] The technical problem to be solved by the present invention is: to provide a speed control mechanism for synchronizing the forward speed of the steel strand with the rotational speed of the opening and closing mechanism and a steel strand spraying production line containing the mechanism. The speed control mechanism does not need to manually adjust the parameters related to the number of revolutions of the opening and closing mechanism. The speed control mechanism can always automatically collect signals by its own structure to ensure that the forward speed of the steel strand is synchronized with the rotational speed of the opening and closing mechanism, which greatly reduces labor costs, improves the safety factor of production, improves production efficiency, and solves the shortcomings of the above-mentioned prior art.

[0023] The technical solution to solve the above technical problems is: a speed control mechanism in which the forward speed of the steel strand is synchronized with the speed of the opening and closing mechanism, comprising an encoder, a support frame, a rotating shaft, a follower turntable and at least 3 groups of pressure wheel assemblies evenly distributed on the follower turntable, the rotating shaft is installed on the support frame through a fixed frame and a bearing I, the rotating shaft is provided with a central hole through which the steel strand passes, the encoder fixed outer ring is connected to the fixed frame through a connecting frame, the encoder rotating inner ring is installed at one end of the rotating shaft, the follower turntable is installed at the other end of the rotating shaft, the follower turntable is provided with a central hole that is connected to the central hole through which the steel strand passes through the rotating shaft, and each group of pressure wheel assemblies includes a wheel A rod fixing seat, a spring, a wheel rod and N pressure wheels, where the value of N is 2-20, the wheel rod fixing seat is fixed on the follower turntable, the wheel rod is composed of a mounting rod and a pressure wheel mounting groove seat with a mounting groove, the pressure wheel is installed in the mounting groove of the pressure wheel mounting groove seat through a pin shaft and a bearing II, the pressure wheel is provided with an arc groove for compressing the steel wire of the steel strand, the mounting rod of the wheel rod is sleeved in the wheel rod fixing seat and limited by a pin installed at the rear end of the mounting rod, the spring is installed on the mounting rod and is located between the wheel rod fixing seat and the pressure wheel mounting groove seat, and when in working state, the pressure wheels of each group of pressure wheel assemblies respectively compress one steel wire of the steel strand.

[0024] The diameter of the arc groove of the pressing wheel is 0-1.0 mm larger than the diameter of the steel wire of the steel strand to be pressed.

[0025] One end of the pin shaft is arranged as a positioning step, and the other end of the pin shaft is fixed by a positioning pin.

[0026] Another technical solution of the present invention is: a steel strand spraying production line, including a steel strand breaking up mechanism, a preheating zone, a spraying cabinet, a cooling zone and a steel strand closing mechanism, and also including a speed control mechanism and a servo motor controller for controlling the servo motors of the steel strand breaking up mechanism and the steel strand closing mechanism. The speed control mechanism is a speed control mechanism in which the forward speed of the steel strand is synchronized with the rotational speed of the opening and closing mechanism, and the encoder of the speed control mechanism is electrically connected to the servo motor controller.

[0027] The speed control mechanism of the present invention synchronizes the forward speed of the steel strand with the rotation speed of the opening and closing mechanism to drive the follower turntable to rotate through the spiral line of the steel strand itself. The rotation speed of the follower turntable is completely determined by the forward speed of the steel strand and the spiral length of the steel strand, and it is always guaranteed that the follower turntable rotates one circle accordingly for every spiral length of the steel strand moved. In this way, the opening and closing mechanism, which is always at the same speed as the follower turntable, also rotates the same number of circles as the number of spirals of the steel strand passing through the mechanism, and the situation of the steel strand braiding point moving will not occur, thereby ensuring the normal production of monofilament spray epoxy steel strand. Regardless of the spiral length of the steel strand replaced, or the production speed of the steel strand adjusted to, there is no need to manually adjust the parameters related to the rotation speed of the opening and closing mechanism, and the structure itself can always automatically collect signals and make correct responses, which greatly reduces labor costs, improves the safety factor of production, and improves production efficiency.

[0028] Next, in conjunction with the accompanying drawings and embodiments, the technical features of a speed control mechanism for synchronizing the forward speed of a steel strand with the rotational speed of an opening and closing mechanism and a steel strand spraying production line including the mechanism are further described. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 : Partial schematic diagram of the existing single-filament epoxy spray steel strand production line (dual motor structure).

[0030] Figure 2 : Partial schematic diagram of the existing single-filament epoxy spray steel strand production line (single motor coupling structure).

[0031] Figure 3 : Left view of the speed control mechanism structure with the existing base number substituted into the calculation formula.

[0032] Figure 4 : The main cross-sectional view of the speed control mechanism structure with the existing base number substituted into the calculation formula.

[0033] Figure 5 : A front and sectional view of the speed control mechanism of the present invention in which the forward speed of the steel strand is synchronized with the rotational speed of the opening and closing mechanism.

[0034] Figure 6 : Right view (enlarged) of the speed control mechanism for synchronizing the forward speed of the steel strand with the rotational speed of the opening and closing mechanism of the present invention.

[0035] Figure 7 : A partial schematic diagram of the steel strand spraying production line of the present invention.

[0036] In the figure: A-scattering mechanism, A1-scattering mechanism motor, A2-scattering mechanism gear, A3-scattering mechanism turntable, B-weaving point, C-preheating zone, D-spraying cabinet, D1-powder spray gun, E-cooling zone, F-closing mechanism, F1-closing mechanism motor, F2-closing mechanism gear, F3-closing mechanism turntable, F4-closing mechanism fixed frame, G-connecting shaft.

[0037] H1-encoder mounting base, H2-frame, H3-turntable, H4-shaft, H5-encoder.

[0038] P-steel strand, P1-center straight wire, P2-external spiral wire.

[0039] 1-support frame, 2-bearing I, 3-encoder, 4-connecting frame, 5-fixed frame, 6-rotating shaft, 61-steel strand passing through the middle hole, 7-follow-up turntable, 8-wheel rod fixing seat, 9-spring, 10-wheel rod, 101-mounting rod, 102-pressure wheel mounting groove seat, 11-pressure wheel, 111-arc groove, 12-pin, 13-bearing II, 14-pin shaft, 15-locating pin, 16-servo motor controller.

[0040] The arrow in the figure indicates the direction of advance of the steel strand. DETAILED DESCRIPTION

[0041] Embodiment 1: A speed control mechanism in which the forward speed of the steel strand is synchronized with the speed of the opening and closing mechanism, such as Figure 5-Figure 6As shown, it includes an encoder 3, a support frame 1, a rotating shaft 6, a follower turntable 7 and three groups of pressure wheel assemblies evenly distributed on the follower turntable, the rotating shaft 6 is installed on the support frame 1 through a fixed frame 5 and a bearing Ⅰ2, a steel strand is opened on the rotating shaft to pass through a middle hole 61, the encoder fixed outer ring is connected to the fixed frame 5 through a connecting frame 4, the encoder rotating inner ring is installed at one end of the rotating shaft 5, the follower turntable 7 is installed at the other end of the rotating shaft, and a steel strand is opened on the follower turntable 7 to pass through the rotating shaft. The center hole is through which the center hole passes. Each group of pressure wheel assemblies includes a wheel rod fixing seat 8, a spring 9, a wheel rod 10 and N pressure wheels 11, where the value of N is 2-20 (the number of pressure wheels is determined by the number of specifications of the outer wire diameter of the steel strand, which can be 2, 3, 4, 5, 6 or more. Each pressure wheel corresponds to a steel wire of a wire diameter. When the steel strand of another wire diameter is replaced, the pressure wheel is also replaced. The diameter of the arc groove of the replaced pressure wheel is equal to or slightly larger than that of the replaced wire diameter. The wheel rod fixing seat 8 is fixed on the follower turntable 7, the wheel rod 10 is composed of a mounting rod 101 and a pressure wheel mounting groove seat 102 with a mounting groove, the pressure wheel 11 is installed in the mounting groove of the pressure wheel mounting groove seat 102 through a pin 14 and a bearing II 13, and the pressure wheel 11 is provided with an arc groove 111 for compressing the steel strand wire. The diameters of the arc grooves on the pressure wheels in the same group of pressure wheel assemblies are different. When using, the arc grooves are replaced according to the diameter of the steel strand. The pressure wheel has a suitable diameter, and the mounting rod 101 of the wheel rod is mounted in the wheel rod fixing seat 8 and is limited by a pin 12 installed at the rear end of the mounting rod. The mounting rod 101 can move up and down in the wheel rod fixing seat 8. The spring 9 is installed on the mounting rod 101 and is located between the wheel rod fixing seat 8 and the pressure wheel mounting groove seat 102. When in working state, the pressure wheel 11 of each group of pressure wheel assemblies presses one steel wire of the steel strand respectively under the elastic force of the spring, and the steel wire is located in the arc groove 111 of the pressure wheel.

[0042] In this embodiment, the diameter of the arc groove of the pressing wheel is 0-1.0 mm larger than the diameter of the steel strand to be pressed. As a variation, the diameter of the arc groove can be adjusted according to actual conditions, as long as it is ensured that the steel strand cannot escape from the arc groove of the pressing wheel, so as to ensure that the pressing wheel rotates along the spiral line of the steel strand.

[0043] In this embodiment, one end of the pin shaft is set as a positioning step, and the other end of the pin shaft is fixed by a positioning pin 15. As a variation, the installation and positioning of the pin shaft can also be carried out in other suitable ways.

[0044] As a variation, the number of the pressure wheel assemblies can be increased according to actual conditions, as long as it does not exceed the number of steel strands distributed on the outer circumference of the braided steel strands.

[0045] Embodiment 2: A steel strand spraying production line, such as Figure 7As shown, it includes a steel strand scattering mechanism, a preheating zone, a spraying cabinet, a cooling zone and a steel strand closing mechanism, and also includes a speed control mechanism and a servo motor controller 16 for controlling the servo motors of the steel strand scattering mechanism and the steel strand closing mechanism. The speed control mechanism is a speed control mechanism in which the forward speed of the steel strand is synchronized with the speed of the opening and closing mechanism as described in Example 1, and the encoder of the speed control mechanism is electrically connected to the servo motor controller. The specific structures of the steel strand scattering mechanism, the preheating zone, the spraying cabinet, the cooling zone and the steel strand closing mechanism are the same as those in the prior art.

[0046] The present invention is applicable to braided steel strands, and the number of braided steel strands is not limited. The working principle is as follows: three pressure wheels are installed on the follower turntable, and arc grooves are opened on the pressure wheels. During the working process, the steel strand passes through the central hole of the follower turntable, and the pressure wheel fixed on the follower turntable presses the steel strand under the elastic force of the spring, so that three of the six external wires of the steel strand (the three external wires are evenly distributed on the circumference of the cross section, and the distribution angle of two adjacent external wires is 120 degrees) are always in the arc groove on the pressure wheel. When the steel strand moves forward, the three external wires pressed in the arc groove of the pressure wheel also translate forward. When the three external wires translate, the friction between the external wires and the pressure wheel will drive the pressure wheel to rotate around the pin shaft. At the same time, the helix angle of the three external wires will give the pressure wheel a thrust that is 90° to the helix angle. This thrust is transmitted to the follower turntable through the pressure wheel, so that the follower turntable passively rotates with the linear motion of the steel strand. At the same time, the follower turntable drives the rotating shaft and the encoder to rotate synchronously. The rotation characteristic of the follower turntable is that when the steel strand moves along the axial direction by the spiral length of an external wire, the follower turntable is pushed by the spiral wire to rotate exactly one circle. This rotation speed is exactly the rotation speed required by the turntable in the breaking mechanism and the closing mechanism to fully match the forward speed of the steel strand. Therefore, as long as the speed signal of the follow-up turntable is collected through the encoder installed on the rotating shaft and rotating synchronously with the follow-up turntable, and the signal is input into the servo motor controller, the turntable speed of the breaking mechanism and the closing mechanism (collectively referred to as the opening and closing mechanism) controlled by the servo motor can be made the same as that of the follow-up turntable, thereby achieving the effect of completely automatic matching of the rotation speed of the breaking mechanism and the closing mechanism with the forward speed of the steel strand.

[0047] Through the above analysis of the working principle of the present invention, it can be known that: the speed ω of the follower turntable 随动转盘 The speed of the encoder ω 编码器 The same, that is, ω 随动转盘 =ω 编码器 ; Speed ​​of the rotating disk of the opening and closing mechanismω 开合机构 =ω 伺服电机 ×s; where s is the transmission ratio from the servo motor to the rotating disk of the opening and closing mechanism, and the transmission ratio s is a correct constant value determined by the transmission mechanism; ω 伺服电机is the speed of the servo motor. Therefore, in the control system of the servo motor, if the speed of the servo motor ω 伺服电机 Set to ω 伺服电机 =ω 编码器 ÷s, then the speed of the servo motor controlled by this control system is ω 伺服电机 =ω 编码器 ÷s, after the servo motor is decelerated by the transmission mechanism, the speed of the transmission to the turntable of the opening and closing mechanism is ω 开合机构 =ω 伺服电机 ×s; 伺服电机 =ω 编码器 Substitute ÷s into ω 开合机构 =ω 伺服电机 ×s, ω 开合机构 =(ω 编码器 ÷s)×s=ω 编码器 , that is, by setting the speed of the servo motor to ω in the servo motor control system 伺服电机 =ω 编码器 ÷s, the speed of the opening and closing mechanism driven by the servo motor will be equal to the speed of the encoder. It is also known that the speed of the encoder is equal to the speed of the follower turntable, so the speed of the opening and closing mechanism turntable is equal to the speed of the follower turntable. Through the rotation characteristics of the follower turntable of the present invention, "when the steel strand moves along the axial direction by the spiral length of an outer wire, the follower turntable is pushed by the spiral wire to rotate exactly one circle", it can be known that when the steel strand moves along the axial direction by the spiral length of an outer wire, the opening and closing mechanism turntable driven by the servo motor also rotates exactly one circle, which achieves the purpose of synchronizing the rotation speed of the opening and closing mechanism turntable with the forward speed of the steel strand. Because in the control system of the servo motor speed, the speed control calculation formula ω 伺服电机 =ω 编码器 ÷s encoder speed ω 编码器 and the reduction ratio s are both correct values, so the final result of the calculation is ω 开合机构 Also the correct value =ω 编码器 =ω 随动转盘 .

Claims

1. A speed control mechanism in which the forward speed of a steel strand is synchronized with the rotation speed of an opening and closing mechanism, characterized in that: It includes an encoder, a support frame, a rotating shaft, a follower turntable and at least 3 groups of pressure wheel assemblies evenly distributed on the follower turntable, the rotating shaft is installed on the support frame through a fixed frame and a bearing I, a steel strand is opened on the rotating shaft to pass through a central hole, the encoder fixed outer ring is connected to the fixed frame through a connecting frame, the encoder rotating inner ring is installed at one end of the rotating shaft, the follower turntable is installed at the other end of the rotating shaft, the follower turntable is opened with a central hole that is connected to the central hole through which the steel strand of the rotating shaft passes, each group of pressure wheel assemblies includes a wheel rod fixing seat, a spring, a wheel rod and N pressure wheels, and the value of N is 2 -20, the wheel rod fixing seat is fixed on the follow-up turntable, the wheel rod is composed of a mounting rod and a pressure wheel mounting groove seat with a mounting groove, the pressure wheel is installed in the mounting groove of the pressure wheel mounting groove seat through a pin shaft and a bearing II, and an arc groove for compressing the steel wire of the steel strand is opened on the pressure wheel, the mounting rod of the wheel rod is sleeved in the wheel rod fixing seat and limited by a pin installed at the rear end of the mounting rod, the spring is installed on the mounting rod and is located between the wheel rod fixing seat and the pressure wheel mounting groove seat, and when in working state, the pressure wheels of each group of pressure wheel assemblies respectively compress one steel wire of the steel strand.

2. A speed control mechanism according to claim 1 wherein the forward speed of the steel strand is synchronized with the rotation speed of the opening and closing mechanism, characterized in that: The diameter of the arc groove of the pressing wheel is 0-1.0 mm larger than the diameter of the steel wire of the steel strand to be pressed.

3. A speed control mechanism according to claim 1 or 2, wherein the forward speed of the steel strand is synchronized with the rotation speed of the opening and closing mechanism, characterized in that: One end of the pin shaft is arranged as a positioning step, and the other end of the pin shaft is fixed by a positioning pin.

4. A steel strand spraying production line, comprising a steel strand scattering mechanism, a preheating zone, a spraying cabinet, a cooling zone and a steel strand closing mechanism, characterized in that: It also includes a speed control mechanism and a servo motor controller for controlling the servo motors of the steel strand spreading mechanism and the steel strand closing mechanism. The speed control mechanism is a speed control mechanism as described in any one of claims 1 to 3, in which the forward speed of the steel strand is synchronized with the rotational speed of the opening and closing mechanism, and the encoder of the speed control mechanism is electrically connected to the servo motor controller.

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