Rubber calender with unwinding leader tension adjustment mechanism

Abstract

The utility model relates to tire production technical field discloses a rubber calender with unwinding guide cloth tension adjusting mechanism, including a plurality of roll, the unwinding guide cloth with tension T is all contacted with roll to exert pressure F to roll, bearing type tension sensor is set up in the both ends of roll, bearing type tension sensor real -time acquisition roll exert radial force f, pneumatic brake is coaxial with the coiled guide cloth, pneumatic brake exerts friction torque M to the coiled guide cloth to adjust the tension T that unwinding guide cloth bears, the utility model discloses real -time measurement pressure F through setting bearing type tension sensor, real -time calculation in the tension T of unwinding guide cloth, compare tension T with preset tension Ts to judge the tightness of unwinding guide cloth, gradually adjust friction torque M through pneumatic brake, gradually adjust tension T, automatically fast and accurately adjust unwinding guide cloth tightness, avoid its wrinkle or overstretch, influence steel wire cord forming quality.

Description

Technical Field

[0001] This utility model relates to the field of tire production technology, specifically to a rubber calender with a fabric unfolding tension adjustment mechanism. Background Technology

[0002] Steel cord fabric is a flexible material composed of thousands of extremely fine steel wires arranged side by side. It cannot directly withstand enormous traction forces and is extremely prone to scattering and twisting under no-load conditions. Therefore, before starting the main production line, a strong yet flexible guide fabric (usually high-strength nylon canvas or a special rubber belt) must be used as a guiding substrate. This guide fabric is pre-passed through the multiple roller systems of the rubber calender. Then, the head of the steel cord fabric is securely spliced ​​onto the tail of the guide fabric. By pulling the guide fabric, the steel cord fabric is smoothly "introduced" and passed through the entire equipment. During this process, the stability of the guide fabric tension is a core factor determining product quality. It directly affects the uniformity of rubber penetration, the arrangement and distribution of the cords in the rubber compound, and ultimately determines the uniformity of the tire cord thickness and the final tire performance. If the tension of the fabric is too low, it is very easy for it to wrinkle and deviate between the rollers, making it impossible for the subsequent steel cord fabric to run smoothly, resulting in uneven rubber thickness. If the tension is too high, it may directly cause the thin steel wires to be overstretched or even broken, damaging its skeleton structure and severely reducing the strength of the fabric. Unstable tension fluctuations will cause the above quality problems to occur alternately or randomly, resulting in batch quality defects.

[0003] The inventors of this application have observed in the actual production of steel wire cord fabric that the current common practice is to use simple mechanical brakes or manually adjusted pneumatic brakes to control the unwinding shaft of the fabric. This method relies entirely on the experience of the operators, has a serious lag in response, and is very likely to cause wrinkles or excessive stretching of the fabric tension. Utility Model Content

[0004] This invention addresses the problem that existing rubber calenders cannot adjust the tension of the unfolded fabric quickly and promptly. It provides a rubber calender with a fabric unfolding tension adjustment mechanism. The specific technical solution is as follows: A rubber calender with a tension adjustment mechanism for unfolding the lead fabric, wherein the roll of lead fabric can rotate under external traction force to unfold into an unfolded lead fabric, characterized in that the rubber calender includes: several parallel rollers, the unfolded lead fabric with tension T in contact with the rollers to apply pressure F to the rollers; bearing-type tension sensors disposed at both ends of the rollers, the bearing-type tension sensors being able to acquire the radial force f applied by the rollers in real time; and a pneumatic brake coaxial with the roll of lead fabric, the pneumatic brake being able to apply a frictional torque M to the roll of lead fabric to adjust the tension T on the unfolded lead fabric.

[0005] Furthermore, the radial force f, pressure F, and tension T satisfy the following: The covering angle α is the included angle when the fabric is unfolded as it passes around the roller.

[0006] Furthermore, the preset tension Ts of the unfolding guide fabric is a fixed value. When T < Ts and |(T-Ts) / Ts| > 2%, the unfolding guide fabric is too loose. The pneumatic brake increases the friction torque M until |(T-Ts) / Ts| ≤ 2%.

[0007] Furthermore, the preset tension Ts of the unfolding guide fabric is a fixed value. When T > Ts and (T-Ts) / Ts > 2%, the unfolding guide fabric is too tight, and the pneumatic brake reduces the friction torque M until |(T-Ts) / Ts| ≤ 2%.

[0008] Furthermore, it also includes: a display screen electrically connected to a pneumatic brake and a bearing-type tension sensor, the display screen being able to adjust the friction torque M according to the difference between the tension T and the preset tension Ts, so as to adjust the unwinding speed V1 of the rolled fabric; and a movable frame with one end for fixing several rollers, the other end of the movable frame being able to fix a support shaft for supporting the rolled fabric, the pneumatic brake being set at both ends of the support shaft, and the display screen being connected to the movable frame.

[0009] As can be seen from the above technical solution, this utility model has the following beneficial effects: This invention uses a bearing-type tension sensor to measure the radial force f in real time and calculate the tension T in the unfolding guide fabric in real time. The tension T is compared with the preset tension Ts to determine the tightness of the unfolding guide fabric. Then, the friction torque M is gradually adjusted by a pneumatic brake, which in turn gradually adjusts the tension T. This allows for automatic, fast, and accurate adjustment of the tightness of the unfolding guide fabric, preventing wrinkles or excessive stretching that could affect the forming quality of the steel wire cord fabric. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 for Figure 1 Side view and force diagram in the figure; Figure 3 for Figure 2 Vector analysis diagram of pressure F and tension T in the figure.

[0011] In the diagram: 1. Moving frame; 2. Support shaft; 3. Pneumatic brake; 4. Roller; 5. Bearing-type tension sensor; 6. Display screen; 7. Rolling fabric guide; 8. Unrolling fabric guide. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] like Figure 1 As shown, this embodiment is a rubber calender with a tension adjustment mechanism for unfolding the lead fabric 8. The roll lead fabric 7 can rotate under external traction force to unfold and form the unfolding lead fabric 8.

[0015] Specifically, the rolled-up guide fabric 7 refers to the rolled-up guide fabric. The external traction equipment moves its free end to the next work station, causing the rolled-up guide fabric 7 to rotate counterclockwise. This causes the rolled-up guide fabric 7 to unfold layer by layer, with the radius gradually decreasing. The unfolding speed V1 of the rolled-up guide fabric 7 refers to the speed at the boundary point E between the rolled-up guide fabric 7 and the unfolded guide fabric 8. It is equal to the product of the rotational speed of the rolled-up guide fabric 7 and the radius of the boundary point E. It is the same as the traction speed V2 of the external traction equipment. The operator determines the traction speed V2 according to the production requirements of the steel wire cord fabric.

[0016] like Figure 2 As shown, the rubber calender includes: several parallel rollers 4, with a tensioned unwinding fabric 8 in contact with the rollers 4 to apply pressure F to the rollers 4; bearing-type tension sensors 5 installed at both ends of the rollers 4, which can acquire the radial force f applied by the rollers 4 in real time; and a pneumatic brake 3 coaxial with the winding unwinding fabric 7, which can apply a frictional torque M to the winding unwinding fabric 7 to adjust the tension T on the unwinding unwinding fabric 8.

[0017] Specifically, three sets of rollers 4 are arranged in parallel, parallel to the axis of the winding fabric 7, so that the unfolding fabric 8 can fit against the side of the rollers 4, eliminating the gap between the unfolding fabric 8 and the side of the rollers 4, and ensuring that the unfolding fabric 8 is subjected to uniform force along the width direction. Secondly, during the unfolding process of the winding fabric 7, there is a tension T inside the unfolding fabric 8 to keep it taut at all times. When it passes over the rollers 4, it can apply a pressure F pointing towards the axis of the rollers 4. As we know from common sense, the greater the tension T, the greater the pressure F, so the two are directly proportional. Furthermore, the bearing-type tension sensor 5 is a standard product. It is a force sensor used to measure the tension of materials during the conveying process. It mainly consists of a high-precision force-measuring bearing and a sensor. The system consists of a housing and an internal strain measurement system. Its working principle is to apply radial force to the conveyed material on a high-precision force-measuring bearing, transmit it through a mechanical structure, and finally convert it into a measurable electrical signal by a strain gauge (or similar sensing element). The bearing-type tension sensor 5 is fixed and coaxially connected to both ends of the roller 4, so that the pressure F on the roller 4 can be transmitted to the bearing-type tension sensor 5 at both ends without loss. This makes the pressure F twice the radial force f on the bearing-type tension sensor 5, and thus the radial force f is proportional to the tension T. Based on the proportional relationship between the radial force f and the tension T, the bearing-type tension sensor 5 can obtain the tension T of the unfolded fabric 8 in real time.

[0018] Secondly, the pneumatic brake 3 is a standard product. It is a braking device that uses gas pressure to control mechanical movement. It drives an internal piston by compressed air, which causes the friction pads to contact the brake disc or brake wheel to generate friction. The friction torque M is the product of the friction force and the radius of the brake disc or brake wheel. The brake disc or brake wheel is fixed and coaxially connected to the roll of fabric 7, thereby realizing the braking of the roll of fabric 7.

[0019] Secondly, when there is a difference between the unfolded length of the rolled fabric 7 and the traction length of the unfolded fabric 8 by the external traction equipment within a unit time, the tension T formed on the unfolded fabric 8 changes, and the radial force f obtained by the bearing-type tension sensor 5 changes accordingly. The pneumatic brake 3 controls the pressure of the friction pad on the brake disc, adjusts the friction torque M in the clockwise direction, and then adjusts the counterclockwise rotation speed of the rolled fabric 7, thereby adjusting the tension T in a timely and rapid manner. The adjustment effect is reflected in real time by the radial force f obtained in real time, so that the unfolded fabric 8 can avoid wrinkles or excessive stretching, and improve the forming quality of the steel wire cord fabric.

[0020] like Figure 3 As shown, the radial force f, pressure F, and tension T satisfy the following: The covering angle α is the included angle when the fabric 8 is unfolded around the roller 4.

[0021] Specifically, since the friction on the side of roller 4 and the elastic deformation of the unfolding guide fabric 8 are not considered, the tension T at all positions of the unfolding guide fabric 8 is the same, causing the wrapping angle α of the roller 4 to change at different positions, and the pressure F to change accordingly. Secondly, the unfolding guide fabric 8 applies pressure F to the entire roller 4, and the roller 4 applies radial force f to the bearing-type tension sensors 5 at both ends, so that the radial force f obtained by the bearing-type tension sensor 5 at one end is half of the pressure F. Secondly, the pressure F applied by the guide fabric to all parts of the roller 4 is the same, so that the radial force f applied by the roller 4 to the bearing-type tension sensor 5 is the same, i.e., f = 0.5F. Thirdly, according to the force vector diagram, there is pressure from the guide fabric on both sides of the roller 4 along the axial direction, so that the pressure... ,therefore Further simplification reveals that: Therefore, based on the radial force f obtained by the bearing-type tension sensor 5, the magnitude of the tension T existing in the guide fabric can be known.

[0022] Secondly, in this embodiment, the display screen 6 only displays the resultant force of the radial force f: pressure F. The display screen 6 calculates the tension based on pressure F = 2f. The conclusion is as follows.

[0023] Furthermore, the display screen 6, which is electrically connected to the pneumatic brake 3 and the bearing-type tension sensor 5, can adjust the friction torque M according to the difference between the tension T and the preset tension Ts, so as to adjust the unwinding speed V1 of the roll-up fabric 7.

[0024] Specifically, based on production experience and requirements for the steel wire cord fabric, the operator sets a fixed preset tension Ts on the display screen 6. The bearing-type tension sensor 5 transmits the real-time pressure F to the display screen 6. The display screen 6 adjusts the compressed gas pressure of the pneumatic brake 3 according to the difference between the tension T and the preset tension Ts, thereby controlling the friction torque M of the pneumatic brake 3 on the rolled-up fabric 7, thereby reducing the difference between the tension T and the preset tension Ts, and thus quickly adjusting the tension of the unrolled fabric 8.

[0025] Furthermore, when T < Ts and |(T-Ts) / Ts| > 2%, the unfolded fabric 8 is too loose, and the pneumatic brake 3 increases the friction torque M until |(T-Ts) / Ts| ≤ 2%.

[0026] Specifically, as the external traction speed V2 decreases, the unwinding speed V1 of the rolled fabric 7 becomes greater than the external traction speed V2. T gradually decreases to less than Ts until T < Ts, and |(T-Ts) / Ts| > 2%. The display screen 6 determines that the unwinding fabric 8 is too loose, and controls the pneumatic brake 3 to gradually increase the friction torque M, thereby gradually reducing the rotational speed of the rolled fabric 7, and further gradually reducing the unwinding speed V1 of the rolled fabric 7. Consequently, the tension T gradually increases, and the pressure F gradually increases. The display screen 6 calculates the difference between the tension T and Ts in real time until |(T-Ts) / Ts| ≤ 2%. The display screen 6 then controls the pneumatic brake 3 to stop the friction torque M, thereby maintaining the tightness of the unwinding fabric 8.

[0027] Furthermore, the preset tension Ts of the unfolding guide fabric 8 is a fixed value. When T > Ts and (T-Ts) / Ts > 2%, the unfolding guide fabric 8 is too tight, and the pneumatic brake 3 reduces the friction torque M until |(T-Ts) / Ts| ≤ 2%.

[0028] Specifically, as the external traction speed V2 increases, the unwinding speed V1 of the rolled fabric 7 becomes less than the external traction speed V2. T gradually becomes greater than Ts until T > Ts and (T-Ts) / Ts > 2%. The display screen 6 determines that the unwinding fabric 8 is too tight, and controls the pneumatic brake 3 to gradually reduce the friction torque M, thereby gradually increasing the rotational speed of the rolled fabric 7, which in turn gradually increases the unwinding speed V1 of the rolled fabric 7. Consequently, the tension T gradually decreases, and the pressure F gradually decreases. The display screen 6 calculates the difference between the tension T and Ts in real time until |(T-Ts) / Ts| ≤ 2%. The display screen 6 then controls the pneumatic brake 3 to stop the friction torque M, thereby maintaining the tightness of the unwinding fabric 8.

[0029] Alternatively, with the external traction speed V2 constant, during the unwinding process of the rolled fabric 7, the radius of the dividing point E gradually decreases. While the rotational speed of the rolled fabric 7 remains constant, the linear velocity of the dividing point E, i.e., the unwinding speed V1, gradually decreases, causing the unwinding speed V1 of the rolled fabric 7 to be less than the external traction speed V2. T gradually becomes greater than Ts until T > Ts and (T-Ts) / Ts > 2%. The display screen 6 determines that the unwinding fabric 8 is too tight and controls the pneumatic brake 3 to gradually reduce the friction torque M, thereby gradually increasing the rotational speed of the rolled fabric 7, which in turn gradually increases the unwinding speed V1. Consequently, the tension T gradually decreases, and the pressure F gradually decreases. The display screen 6 calculates the difference between the tension T and Ts in real time until |(T-Ts) / Ts| ≤ 2%. The display screen 6 then controls the pneumatic brake 3 to stop the friction torque M, thus maintaining the tightness of the unwinding fabric 8.

[0030] Furthermore, this embodiment also includes a movable frame 1 with one end for fixing several rollers 4, and the other end of the movable frame 1 can be fixed to a support shaft 2 for supporting the roll-up fabric 7. Pneumatic brakes 3 are provided at both ends of the support shaft 2, and the display screen 6 is connected to the movable frame 1.

[0031] Specifically, the top left side of the movable frame 1 is fixed with a bearing to support the shaft 2. The support shaft 2 is coaxial with the winding fabric 7 to support the winding fabric 7, so that the rotation speed of the support shaft 2 and the winding fabric 7 is the same. Secondly, both ends of the support shaft 2 are connected to the pneumatic brake 3. The pneumatic brake 3 can apply a frictional torque M to the support shaft 2, thereby adjusting the rotation speed of the support shaft 2, thereby adjusting the rotation speed of the winding fabric 7, and thus adjusting the pressure F. The display screen 6 is fixed to the side of the movable frame 1 by bolts. It displays the pressure F in real time and calculates and displays the tension T in real time, thereby continuously adjusting the frictional torque M to adjust the tension T, and thus quickly and accurately adjusting the tension T of the unfolding fabric 8.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0033] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A rubber calender with a tension adjustment mechanism for unfolding the lead fabric, wherein the roll of lead fabric (7) can rotate under external traction force to unfold and form the unfolding lead fabric (8), characterized in that, The rubber calender includes: A plurality of parallel rollers (4) are arranged in parallel, and the unfolded guide fabric (8) under tension T is in contact with the rollers (4) to apply pressure F to the rollers (4); Bearing-type tension sensors (5) are installed at both ends of the roller (4) in the axial direction. The bearing-type tension sensors (5) can acquire the radial force f applied by the roller (4) in real time; and a pneumatic brake (3) is coaxial with the winding guide (7). The pneumatic brake (3) can apply a frictional torque M to the winding guide (7) to adjust the tension T on the unfolding guide (8).

2. The rubber calender according to claim 1, characterized in that: Radial force f, pressure F, and tension T satisfy the following: The covering angle α is the included angle of the unfolding guide fabric (8) when it passes around the roller (4).

3. The rubber calender according to claim 2, characterized in that: The preset tension Ts in the unfolding guide fabric (8) is a fixed value. When T < Ts and |(T-Ts) / Ts| > 2%, the unfolding guide fabric (8) is too loose. The pneumatic brake (3) increases the friction torque M until |(T-Ts) / Ts| ≤ 2%.

4. The rubber calender according to claim 2, characterized in that: The preset tension Ts in the unfolding guide fabric (8) is a fixed value. When T > Ts and (T-Ts) / Ts > 2%, the unfolding guide fabric (8) is too tight. The pneumatic brake (3) reduces the friction torque M until |(T-Ts) / Ts| ≤ 2%.

5. The rubber calender according to claim 1, characterized in that, Also includes: The display screen (6) is electrically connected to the pneumatic brake (3) and the bearing-type tension sensor (5). The display screen (6) can adjust the friction torque M according to the difference between the tension T and the preset tension Ts, so as to adjust the unwinding speed V1 of the roll-up fabric (7). as well as A movable frame (1) is used to fix a plurality of rollers (4) at one end, and a support shaft (2) for supporting the roll-up fabric (7) can be fixed at the other end of the movable frame (1). The pneumatic brake (3) is provided at both ends of the support shaft (2), and the display screen (6) is connected to the movable frame (1).

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