Rapid die changing device for continuous aluminum alloy extrusion forming

Abstract

The utility model belongs to the technical field of aluminum alloy extrusion forming, and discloses a continuous aluminum alloy extrusion forming rapid die changing device which comprises a shell frame, a matching opening corresponding to an extrusion forming device is formed in the shell frame, a die changing opening is formed in one side of the shell frame, and a plurality of sets of dies and a die switching assembly are arranged in the shell frame. A power assembly for driving switching is arranged on one side of the mold switching assembly, an ejection mechanism for enabling the mold to be matched with the extrusion forming device is arranged at the position, deviating from the matching opening, of the mold switching assembly, the mold switching assembly comprises a switching rotating disc and a rotating shaft, and multiple sets of mold storage openings are formed in the switching rotating disc; the numerical control full-automatic die changing device is compact and reasonable in structural design, capable of achieving numerical control full-automatic die changing, easy to operate, high in die changing speed, free of influence on production, high in device stability, accurate in positioning, practical and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminum alloy extrusion forming technical field, concretely to a continuous aluminum alloy extrusion forming quick die changing device. BACKGROUND

[0002] In the field of aluminum material processing, extrusion forming as a key process is widely used in the manufacture of various aluminum alloy products. However, in the current aluminum extrusion process, there are many problems in the die changing link, which seriously restricts the production efficiency and the operation experience of workers.

[0003] Most aluminum extrusion processing devices, due to the consideration of equipment space layout and process design, the die is usually set high. This makes workers have to use ladders and other auxiliary tools when changing the die. But using a ladder not only increases the complexity of the operation, but also brings safety risks, and a slight mistake can cause the worker to fall and get hurt. Moreover, this operation mode greatly reduces the efficiency of changing the die, causing the production line to stop for a long time.

[0004] Aluminum extrusion processing belongs to hot processing technology, and in the processing process, the extrusion forming device will generate a lot of heat. This not only raises the temperature of the working environment, but also makes the die changing operation extremely difficult. High temperature greatly affects the comfort and work enthusiasm of workers. In a high temperature environment, the operation speed of workers is limited, the die changing speed is slow, and the actual production time of the equipment is greatly shortened, so the production efficiency cannot be effectively guaranteed. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a continuous aluminum alloy extrusion forming quick die changing device to solve the problems of inconvenient die changing of aluminum alloy extrusion forming in the background art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a continuous aluminum alloy extrusion forming quick die changing device, comprising a shell frame, the shell frame is a closed structure, and high-temperature-resistant stainless steel material is adopted. A matching port corresponding to the extrusion forming device is arranged on the shell frame, a die changing port is arranged on one side of the shell frame, a plurality of die changing assemblies are arranged in the shell frame, a power assembly for driving switching is arranged on one side of the die changing assembly, and an ejection mechanism for matching the die with the extrusion forming device is arranged at the side of the die changing assembly away from the matching port.

[0007] Preferably, the die changing assembly comprises a switching turntable and a rotating shaft, the rotating shaft is connected with a bearing in the shell frame, the switching turntable is coaxially connected with the rotating shaft, a plurality of die storage ports are arranged on the switching turntable, and the plurality of die storage ports are distributed in a circumferentially symmetrical manner.

[0008] Preferably, the power assembly comprises a large gear, a pinion and a servo motor, one side of the switching turntable is coaxially connected with the large gear, the lower portion of the large gear is provided with the pinion, the large gear is in meshing connection with the pinion, one side of the pinion is provided with the servo motor, and the servo motor is coaxially connected with the pinion.

[0009] Preferably, the ejection mechanism comprises a structural plate and a servo telescopic rod, one side of the switching turntable away from the matching port is provided with the structural plate, the servo telescopic rod is fixedly connected to the structural plate, the structural plate is provided with an avoiding hole, the output end of the servo telescopic rod passes through the avoiding hole, and the output end of the servo telescopic rod corresponds to the matching port.

[0010] Preferably, one side of the switching turntable away from the matching port is further provided with a positioning mechanism, the positioning mechanism comprises an extension shaft, a reflector, an encoder disc and a photoelectric assembly, one side of the large gear away from the switching turntable is coaxially connected with the extension shaft, the reflector is arranged at the position adjacent to the large gear of the extension shaft, one end of the extension shaft away from the reflector is coaxially connected with the encoder disc, and the photoelectric assembly is arranged on the inner side wall of the shell frame and corresponds to the encoder disc.

[0011] Preferably, the photoelectric assembly comprises a plurality of groups of laser emitters and a plurality of groups of light signal receiving devices, the laser emitters are all arranged on the movement track of the code hole of the encoder disc, the output end of the laser emitter is opposite to the encoder disc, and the laser emitter is provided with the corresponding light signal receiving device below.

[0012] Compared with the prior art, the continuous aluminum alloy extrusion forming rapid mold changing device has the following beneficial effects:

[0013] 1. The continuous aluminum alloy extrusion forming rapid mold changing device is provided with a mold switching assembly, a power assembly, an ejection mechanism and a positioning mechanism, can realize numerical control full-automatic mold changing, is simple to operate, has rapid mold changing speed, does not affect production, is high in stability, high in positioning accuracy and practical and reliable.

[0014] 2. The switching turntable is provided on the switching turntable, a plurality of mold storage ports are arranged on the switching turntable, a plurality of molds can be preloaded, the mold switching can be performed by rotating the switching turntable during use, the mold can be rapidly replaced, and the production efficiency is not affected.

[0015] 3. The positioning mechanism is arranged, the positioning is performed by using light and an encoder disc, the positioning accuracy is high, the error accumulation after multiple operations is prevented, the device is not prone to errors, and the reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the utility model;

[0017] Figure 2 It is an internal structure schematic view of the shell frame of the utility model;

[0018] Figure 3 It is the inside structure schematic view of the shell frame of the utility model;

[0019] Figure 4 It is the structure schematic view of the positioning mechanism of the utility model;

[0020] Figure 5 It is the structure schematic view of the code disc and the photoelectric assembly of the utility model.

[0021] In the drawing: 1, shell frame; 2, cooperation mouth; 3, die changing mouth; 4, die switching assembly; 5, power assembly; 6, ejection mechanism; 7, switching turntable; 8, rotating shaft; 9, die storage mouth; 10, large gear; 11, small gear; 12, servo motor; 13, structure plate; 14, servo telescopic rod; 15, avoiding hole; 16, positioning mechanism; 17, extension rotating shaft; 18, reflector; 19, code disc; 20, photoelectric assembly; 21, laser transmitter; 22, optical signal receiving device. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] Please refer to Figures 1-5 The utility model provides a technical scheme:

[0024] A continuous aluminum alloy extrusion forming rapid die changing device, including shell frame 1, the shell frame 1 is provided with the cooperation mouth 2 corresponding with extrusion forming device, the shell frame 1 is provided with the die changing mouth 3 on one side, and the shell frame 1 is provided with multiple groups of die and die switching assembly 4, the die switching assembly 4 is provided with the power assembly 5 of driving switching on one side, and the die switching assembly 4 is provided with the ejection mechanism 6 for making die cooperate with extrusion forming device away from the cooperation mouth 2. The die changing mouth 3 is used for staff to replace the preset die in the device, for some high extrusion forming device, the die changing mouth 3 can be set down, and the die changing mouth 3 is recommended to be set at the place far from the cooperation mouth 2 to avoid the temperature influence of extrusion forming device on work, which can improve comfort.

[0025] Further, the die switching assembly 4 includes switching turntable 7 and rotating shaft 8, the rotating shaft 8 is connected with bearing in the shell frame 1, the switching turntable 7 is coaxially connected on the rotating shaft 8, the switching turntable 7 is provided with multiple groups of die storage mouth 9, and the multiple groups of die storage mouth 9 are distributed in circumferential symmetry. The switching turntable 7 can rotate, and the upper die of the switching turntable 7 is rotated to the corresponding place of the cooperation mouth 2, that is, switched to the die.

[0026] Further, the power assembly 5 comprises a large gear 10, a small gear 11 and a servo motor 12, the large gear 10 is coaxially connected to one side of the switching turntable 7, the small gear 11 is arranged below the large gear 10, the large gear 10 is meshingly connected with the small gear 11, the servo motor 12 is arranged on one side of the small gear 11, and the servo motor 12 is coaxially connected with the small gear 11. The servo motor 12 drives the small gear 11 to rotate, and the small gear 11 drives the large gear 10 to rotate through meshing, so as to drive the switching turntable 7 to rotate and realize mold switching. The cooperation of the large gear 10 and the small gear 11 can reduce the angular velocity of rotation and improve the rotation accuracy.

[0027] Further, the ejection mechanism 6 comprises a structure plate 13 and a servo telescopic rod 14, the structure plate 13 is arranged on the side of the switching turntable 7 away from the matching port 2, the servo telescopic rod 14 is fixedly connected to the structure plate 13, the structure plate 13 is provided with an avoiding hole 15, the output end of the servo telescopic rod 14 passes through the avoiding hole 15, and the output end of the servo telescopic rod 14 corresponds to the matching port 2. When the mold needs to be changed, the extrusion molding device releases the mold, and the mold is ejected to return to the original mold storage port 9, the switching turntable 7 is rotated to switch to the target mold, and the servo telescopic rod 14 pushes the mold to cooperate with the extrusion molding device.

[0028] Further, the switching turntable 7 is also provided with a positioning mechanism 16 on the side away from the matching port 2, the positioning mechanism 16 comprises an extension shaft 17, a reflector 18, an encoding disc 19 and a photoelectric assembly 20, the extension shaft 17 is coaxially connected to the side of the large gear 10 away from the switching turntable 7, the reflector 18 is arranged on the extension shaft 17 near the large gear 10, the encoding disc 19 is coaxially connected to the end of the extension shaft 17 away from the reflector 18, and the photoelectric assembly 20 is arranged on the inner side wall of the shell frame 1 corresponding to the encoding disc 19. The encoding disc 19 preferably uses a Gray code disc, and the error correction feature of the Gray code disc can ensure that the error rate is low. Although the servo motor 12 is used to control the rotation of the switching turntable 7, error accumulation after multiple operations may cause the mold in the mold storage port 9 to fail to align with the matching port 2 to complete the mold changing operation. The positioning mechanism 16 can prevent error accumulation and greatly improve the service life.

[0029] Further, the photoelectric assembly 20 comprises a plurality of laser emitters 21 and a plurality of light signal receiving devices 22, the laser emitters 21 are arranged on the code hole movement track of the coded disc 19, and the output ends of the laser emitters 21 are opposite to the coded disc 19, and the laser emitters 21 are provided with corresponding light signal receiving devices 22 below. The light emitted by the laser emitters 21 passes through the coded disc 19 to the reflecting mirror 18, is reflected on the light signal receiving device 22, the light signal receiving device 22 converts the light signal into an electric signal according to the photoelectric effect to realize signal output, the light of the plurality of laser emitters 21 is on the coded disc 19 and has coding information, and the plurality of light signal receiving devices 22 judge the angle information of the coded disc 19 according to the coding information, so that the angle information of the switching turntable 7 can be judged.

[0030] The laser emitters (21) are preferably uniformly arranged along the coded disc (19) with a radial interval of 30°, so that at least two groups of laser emitters (21) can simultaneously detect the code hole position when the coded disc (19) rotates, and redundancy checking is realized.

[0031] Structure description:

[0032] The shell frame 1 is a main frame structure of the device, which is used for mounting the cooperation port 2, the die changing port 3, the die switching assembly 4 and other components, and provides a mounting basis and protection for the whole device.

[0033] The cooperation port 2 is arranged on the shell frame 1, which is a part for docking with the extrusion forming device, so that the die can cooperate with the extrusion forming device to perform aluminum alloy extrusion work.

[0034] The die changing port 3 is located on one side of the shell frame 1, which is a channel for workers to change the preset die in the device, and for the higher extrusion forming device, the die changing port 3 can be arranged lower and away from the cooperation port 2 to avoid the influence of high temperature.

[0035] The die switching assembly 4 comprises a switching turntable 7 and a rotating shaft 8, which is responsible for switching the die, and different dies are rotated to the corresponding position of the cooperation port 2 by rotating the switching turntable 7.

[0036] The power assembly 5 is composed of a large gear 10, a small gear 11 and a servo motor 12, which provides power for the rotation of the switching turntable 7 of the die switching assembly 4, and improves the rotation precision through the meshing transmission of the large gear and the small gear.

[0037] The ejection mechanism 6 comprises a structure plate 13 and a servo telescopic rod 14, which is responsible for ejecting the target die on the switching turntable 7 when the die is replaced, so that the target die is tightly matched with the extrusion forming device.

[0038] The switching turntable 7 is a key component of the die switching assembly 4, which is provided with a plurality of die storage ports 9 and can rotate around the rotating shaft 8 to realize the rapid switching of the die.

[0039] Rotating shaft 8: bearing connection with the shell frame 1, is the support shaft of the switching turntable 7 rotation, make the switching turntable 7 can stable rotation;

[0040] Mold storage port 9: set in the switching turntable 7, is circularly symmetric distribution, for preloading multiple sets of mold, facilitate switching use at any time;

[0041] Large gear 10: coaxial connection with the switching turntable 7, in the power assembly 5, through the meshing with the pinion 11, the power of servo motor 12 is transmitted to the switching turntable 7, drive its rotation;

[0042] Pinion 11: meshing with the large gear 10, and coaxial connection with the servo motor 12, in the power assembly 5, the high speed rotation of servo motor 12 is converted into the low speed rotation of the large gear 10, improve the rotation accuracy;

[0043] Servo motor 12: power source of the power assembly 5, provides power for the rotation of the pinion 11, and then drives the rotation of the large gear 10 and the switching turntable 7, realizes the mold switching;

[0044] Structure plate 13: a component of the ejection mechanism 6, fixed connection servo telescopic rod 14, provides installation support for servo telescopic rod 14, and the avoiding hole 15 is formed on the top;

[0045] Servo telescopic rod 14: the key execution component of the ejection mechanism 6, the output end passes through the avoiding hole 15 of the structure plate 13, the output end corresponds with the matching port 2, for ejecting the mold;

[0046] Avoiding hole 15: set in the structure plate 13, for the output end of servo telescopic rod 14 to pass through, avoid the movement of structure plate 13 to servo telescopic rod 14 to cause hindrance;

[0047] Positioning mechanism 16: for ensuring the accuracy of mold switching, contains extension shaft 17, mirror 18, encoding disc 19 and photoelectric assembly 20, prevents the error accumulation after multiple operation;

[0048] Extension shaft 17: coaxial connection with the large gear 10, one end connects the mirror 18, the other end connects the encoding disc 19, for transmitting the rotation information of the large gear 10;

[0049] Mirror 18: set in the extension shaft 17 near the large gear 10, cooperate with the encoding disc 19 and the photoelectric assembly 20, reflect the light emitted by the laser emitter 21 to the optical signal receiving device 22;

[0050] Encoding disc 19: coaxial connection with the extension shaft 17, recommend to use gray code disc, use its self error correction characteristics to reduce the error rate, provide encoding information for positioning;

[0051] Photoelectric component 20: composed of multiple sets of laser emitters 21 and multiple sets of light signal receiving devices 22, used to receive the encoding information of the encoding disc 19, determine the angle of the switching turntable 7, and realize positioning calibration;

[0052] Laser emitter 21: a component of the photoelectric component 20, placed on the code hole movement track of the encoding disc 19, with the output end facing the encoding disc 19, emitting light for obtaining encoding information;

[0053] Light signal receiving device 22: a component of the photoelectric component 20, located below the laser emitter 21, converting light signals into electrical signals based on the photoelectric effect, receiving and analyzing encoding information, and determining the angle information of the encoding disc 19 and the switching turntable 7.

[0054] Working principle: The main structure of the device includes a shell frame 1, which is provided with a matching port 2 corresponding to the extrusion molding device and a mold changing port 3 for workers to replace the preset mold. For the extrusion molding device with high height, the mold changing port 3 can be set lower, and it is recommended to be set far away from the matching port 2, so as to avoid the influence of high temperature of the extrusion molding device on the operation of the workers and improve the working comfort. The mold switching is one of the core functions of the device, which is completed by the mold switching assembly 4 and the power assembly 5. The mold switching assembly 4 includes a switching turntable 7 and a rotating shaft 8, and the rotating shaft 8 is connected in the shell frame 1 through a bearing, and the switching turntable 7 is coaxially connected on the rotating shaft 8. The switching turntable 7 is circumferentially symmetrically distributed with multiple mold storage ports 9, which can be preloaded with multiple molds. The power assembly 5 is composed of a large gear 10, a small gear 11 and a servo motor 12. One side of the switching turntable 7 is coaxially connected with the large gear 10, and the small gear 11 below the large gear 10 is engaged with the large gear 10, and the servo motor 12 is coaxially connected with the small gear 11. When the mold switching is needed, the servo motor 12 provides power to drive the small gear 11 to rotate, and since the small gear 11 is engaged with the large gear 10, the large gear 10 rotates, and then drives the switching turntable 7 to rotate. Using the large gear 10 and the small gear 11 in cooperation can effectively reduce the angular velocity and improve the rotation accuracy, so as to ensure that the switching turntable 7 rotates accurately to the target position, and the required mold rotates to the position corresponding to the matching port 2. The ejection mechanism 6 is responsible for making the mold cooperate with the extrusion molding device. It is composed of a structure plate 13 and a servo telescopic rod 14, the structure plate 13 is arranged on the side of the switching turntable 7 away from the matching port 2, and the servo telescopic rod 14 is fixedly connected on the structure plate 13, and the structure plate 13 is provided with an avoiding hole 15, and the output end of the servo telescopic rod 14 passes through the avoiding hole 15, and the output end corresponds to the matching port 2. When the mold needs to be replaced, the extrusion molding device releases the current mold first, and then the mold is ejected to return to the original mold storage port 9. Then, the switching turntable 7 rotates to switch to the target mold, at this time the servo telescopic rod 14 is extended, and the target mold is pressed to tightly cooperate with the extrusion molding device, so as to complete the installation and positioning of the mold, and prepare for the subsequent extrusion molding work. In order to ensure the accuracy of the mold switching, prevent the error accumulation after multiple operations from causing the mold to fail to accurately align with the matching port, the device is also provided with a positioning mechanism 16. The positioning mechanism 16 includes an extension shaft 17, a mirror 18, an encoding disc 19 and a photoelectric assembly 20. The large gear 10 away from the switching turntable 7 is coaxially connected with the extension shaft 17, and the extension shaft 17 is provided with the mirror 18 near the large gear 10, and the end away from the mirror 18 is coaxially connected with the encoding disc 19, and the photoelectric assembly 20 is arranged on the inner wall of the shell frame 1 corresponding to the encoding disc 19. The encoding disc 19 is recommended to use Gray code disc, which uses its self-correction feature to reduce the error rate. The photoelectric assembly 20 is composed of multiple laser emitters 21 and multiple optical signal receiving devices 22.The laser emitters 21 are all arranged on the code hole movement track of the coded disc 19, and the output ends are opposite to the coded disc 19, and corresponding light signal receiving devices 22 are arranged below. When the switching turntable 7 rotates, the light emitted by the laser emitters 21 passes through the coded disc 19, is reflected at the mirror 18, and then hits the light signal receiving device 22. The light signal receiving device 22 converts the light signal into an electric signal according to the photoelectric effect to realize signal output. The light of the multiple sets of laser emitters 21 hits the coded disc 19 to form coded information, and the multiple sets of light signal receiving devices 22 judge the angle information of the coded disc 19 by analyzing the coded information, and since the coded disc 19 is coaxially connected with the switching turntable 7, the angle information of the switching turntable 7 can be further judged. In this way, the positioning mechanism 16 can monitor the rotation angle of the switching turntable 7 in real time, and calibrate it, so that the mold in the mold storage port 9 can be accurately aligned with the matching port 2, the mold changing work is completed, and the service life and working stability of the device are greatly improved. In summary, the continuous aluminum alloy extrusion forming rapid mold changing device realizes numerical control full-automatic mold changing through the cooperative work of the mold switching assembly 4, the power assembly 5, the ejection mechanism 6 and the positioning mechanism 16, is simple to operate, has fast mold changing speed, is accurate in positioning, and is strong in stability, and can effectively improve the efficiency and quality of aluminum alloy extrusion forming production.

[0055] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A rapid die-changing device for continuous aluminum alloy extrusion molding, comprising a housing frame (1), characterized in that: The outer frame (1) is provided with a mating port (2) corresponding to the extrusion molding device. A mold changing port (3) is provided on one side of the outer frame (1). The mold changing port (3) is located at a distance from the mating port (2). Multiple sets of molds and mold switching components (4) are provided inside the outer frame (1). A power component (5) for driving switching is provided on one side of the mold switching component (4). An ejection mechanism (6) for cooperating the mold with the extrusion molding device is provided on the mold switching component (4) away from the mating port (2). The outer frame (1) is a closed structure and is made of high-temperature resistant stainless steel.

2. The continuous aluminum alloy extrusion forming quick die-changing device according to claim 1, characterized in that: The mold switching assembly (4) includes a switching turntable (7) and a rotating shaft (8). The rotating shaft (8) is connected to the bearing inside the outer frame (1). The switching turntable (7) is coaxially connected to the rotating shaft (8). The switching turntable (7) is provided with multiple sets of mold storage ports (9), and the multiple sets of mold storage ports (9) are distributed in a circumferentially symmetrical manner.

3. The rapid die-changing device for continuous aluminum alloy extrusion molding according to claim 2, characterized in that: The power assembly (5) includes a large gear (10), a small gear (11) and a servo motor (12). The large gear (10) is coaxially connected to one side of the switching turntable (7). The small gear (11) is located below the large gear (10). The large gear (10) and the small gear (11) are meshed together. The servo motor (12) is located on one side of the small gear (11). The servo motor (12) and the small gear (11) are coaxially connected.

4. The rapid die-changing device for continuous aluminum alloy extrusion molding according to claim 2, characterized in that: The ejection mechanism (6) includes a structural plate (13) and a servo telescopic rod (14). The switching turntable (7) is provided with a structural plate (13) on the side away from the mating port (2). The servo telescopic rod (14) is fixedly connected to the structural plate (13). A clearance hole (15) is provided on the structural plate (13). The output end of the servo telescopic rod (14) passes through the clearance hole (15) and the output end of the servo telescopic rod (14) corresponds to the mating port (2).

5. The continuous aluminum alloy extrusion molding quick die-changing device according to claim 3, characterized in that: The switching turntable (7) is also provided with a positioning mechanism (16) on the side away from the mating port (2). The positioning mechanism (16) includes an extension shaft (17), a reflector (18), an encoder disk (19), and a photoelectric component (20). The side of the large gear (10) away from the switching turntable (7) is coaxially connected to the extension shaft (17). The extension shaft (17) is provided with a reflector (18) near the large gear (10). The end of the extension shaft (17) away from the reflector (18) is coaxially connected to the encoder disk (19). The inner wall of the outer frame (1) is provided with a photoelectric component (20) corresponding to the encoder disk (19).

6. The rapid die-changing device for continuous aluminum alloy extrusion molding according to claim 5, characterized in that: The optoelectronic component (20) includes multiple sets of laser emitters (21) and multiple sets of optical signal receiving devices (22). The laser emitters (21) are all placed on the code hole movement trajectory of the encoder disk (19), and the output end of the laser emitter (21) faces the encoder disk (19). A corresponding optical signal receiving device (22) is provided below the laser emitter (21).

7. The rapid die-changing device for continuous aluminum alloy extrusion molding according to claim 6, characterized in that: The laser emitters (21) of the optoelectronic component (20) are distributed at equal angles along the radial direction of the encoding disk (19). The output end of each group of laser emitters (21) is vertically aligned with the code hole of the encoding disk (19), and the corresponding optical signal receiving device (22) receives the reflected light signal through the reflector (18).

8. The continuous aluminum alloy extrusion forming quick die-changing device according to claim 5, characterized in that: The encoding disk (19) uses a Gray code disk.

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