CN204712398U - A four-station turntable mechanism with servo power - Google Patents

Abstract

The utility model relates to a servo-powered four-station turntable mechanism applied to the field of multi-material injection molding machines, which mainly comprises a base plate, a turntable which can rotate around a rotating shaft assembly arranged at the center of the base plate, a servo motor which can drive the turntable to rotate through a linked gear meshing transmission, a positioning latch assembly arranged at the circumferential edge of the turntable, and the like; the 120-180 indexing type of the mechanism can realize a rotation indexing mode such as 0-180-0 (360), or 0-120-240-0 (360), or 0-120-180-240-0 (360); the 90-180 indexing type of the mechanism can realize a rotation indexing mode such as 0-180-0 (360), or 0-90-180-0 (360), or 0-90-180-270-0 (360); the mechanism has fast rotation, stable start and stop, precise indexing, and has a variety of multi-station and multi-mode use options.

Description

A four-station turntable mechanism with servo power

technical field

The utility model relates to a four-station turntable mechanism with servo power, which is applied to the field of multi-material injection molding machines.

Background technique

At present, the common turntable mechanism generally uses a hydraulic motor to drive the rotation, and cooperates with the ordinary switch hydraulic control circuit, not only has a lot of energy loss, slow response speed, but also has low control accuracy and low production efficiency; the general turntable mechanism usually only has 2 rotations Stations (0 degrees and 180 degrees) are suitable for the production of 2-color (or 2 types) plastic products, but not suitable for 3-color, 4-color, or more color elements (or Plastic types) production of plastic products. How to achieve high-precision control and meet diversified needs has become an urgent problem to be solved.

The word "two colors" or "three colors" in the utility model is a general term, referring to different colors or different types of plastic raw materials.

Utility model content

The purpose of this utility model is to provide a servo-powered four-station turntable rotation indexing structure and control scheme, which has the characteristics of stable start and stop, fast rotation, accurate angle, high repeatability, energy saving and consumption reduction, and high production efficiency.

The purpose of this utility model is achieved in this way: a four-station turntable mechanism with servo power mainly includes the bottom plate as the carrier body of the whole turntable mechanism, the turntable as the working platform of the whole turntable mechanism, the central rotating shaft assembly and the servo motor, and the turntable passes through the rotating shaft The component is positioned at the center of the bottom plate, and a linkage gear is arranged on the periphery of the turntable. The linkage gear meshes with the teeth on the periphery of the turntable, and transmits the speed and torque to the turntable, and drives the turntable to revolve around the shaft assembly on the plane of the bottom plate Rotate, on the edge of the bottom plate, there are upper pressing block, right pressing block, left pressing block and lower pressing block. The upper pressing block, right pressing block, left pressing block and lower pressing block form a certain closed space; Four stations are set, and circular arc steps are arranged on the periphery of the turntable. At the arc steps, the turntable is provided with a four-station indexing and positioning mechanism. The four V-shaped positioning slots are distributed according to the corresponding angles of the four stations. On the left side of the bottom plate, there is a positioning oil cylinder assembly with the center line along the radial direction of the turntable. The piston rod end of the oil cylinder assembly is installed and connected with a V Type pins, pins and slots form the indexing and positioning mechanism of the turntable.

The above-mentioned servo-powered four-station turntable mechanism is equipped with a non-contact electromagnetic induction square head induction switch at the V-shaped latch, which is used to detect the retraction and extension of the latch respectively. When the latch is retracted, the turntable is unlocked and can be rotated; When the latch is extended and inserted into the V-shaped inner slope of the slot, the turntable is locked and stopped and cannot be rotated.

The above-mentioned servo power four-station turntable mechanism is provided with a non-contact electromagnetic induction round head induction switch at the right pressure block, and eight detection recesses suitable for the switches are provided at the circular arc steps of the turntable. According to the corresponding angle distribution of the four stations, the detection signals of the switches are logically combined to judge the corresponding indexing position of the turntable.

In the aforementioned servo-powered four-station turntable mechanism, the angular distribution of the four-stations of the indexing and positioning action mechanism includes a 120-180 indexing type and a 90-180 indexing type.

The above-mentioned servo-powered four-position turntable mechanism, the 120-180 indexing type has four working positions of 0/360 degrees, 120 degrees, 180 degrees, and 240 degrees, including: in the two-station 180-degree rotating indexing mode, that is The action cycle of 0-180-0/360 rotary indexing; in the three-station 120-degree rotary indexing working mode, that is, the action cycle of 0-120-240-0/360 rotary indexing; in the four-station rotary indexing Working mode, that is, the action cycle of 0-120-180-240-0/360 rotation indexing.

The above-mentioned servo-powered four-position turntable mechanism, the 90-180 indexing type has four working positions of 0/360 degrees, 90 degrees, 180 degrees, and 270 degrees, including the two-station 180-degree rotating indexing mode, that is, 0- The action cycle of 180-0/360 rotary indexing; in the three-station 90-degree rotary indexing working mode, that is, the action cycle of 0-90-180-0/360 rotary indexing; in the four-station 90-degree rotary indexing Working mode, that is, the action cycle of 0-90-180-270-0/360 rotation indexing.

The above-mentioned servo-powered four-station turntable mechanism, the indexing method of the mechanism, sets the indexing positioning mechanism on the turntable according to the 120-180 indexing pattern, and sets 0/360 degrees and 120 degrees in the 120-180 indexing pattern , 180 degrees, 240 degrees four working positions, including two-station 180-degree rotary indexing mode, three-station 120-degree rotary indexing mode and four-station rotary indexing mode, among which:

1. It can realize the two-station 180-degree rotary indexing mode, that is, the action cycle of 0-180-0/360 rotary indexing. At the 0-degree station, after the injection molding machine completes the plastic injection of the first color (or type) , the turntable 2 drives the mold installed on it to rotate to the 180-degree station for plastic injection of the second color (or type) and related actions. After that, the turntable 2 drives the mold to rotate to the 0-degree station, or the turntable 2 can Continue to rotate from 180 degrees to 360 degrees. At this time, the injection molding machine has completed a production action cycle and can perform a new action cycle.

2. It can realize the three-station 120-degree rotary indexing mode, that is, the action cycle of 0-120-240-0/360 rotary indexing. For example, at the 0-degree station, the injection molding machine completes the first color (or type) After plastic injection, the turntable 2 drives the mold installed on it to rotate to the 120-degree station for plastic injection of the second color (or type), and then continues to rotate to the 240-degree station for the third color (or type) plastic injection. type) plastic injection and related actions, and finally, the turntable 2 drives the mold to rotate to the 0-degree position, or the turntable 2 can continue to rotate from 240 degrees to 360 degrees, that is, to reach the same reset angle, for the next new action cycle prepare for.

3. It can realize the four-station rotary indexing mode, that is, the action cycle of 0-120-180-240-0/360 rotary indexing. For example, at the 0-degree station, the injection molding machine completes the first color (or type) After plastic injection, the turntable drives the mold installed on it to rotate to the 120-degree station for plastic injection of the second color (or type), and then continues to rotate to the 240-degree station for the third color (or type) ) plastic injection and related actions, and then continue to rotate to the 360-degree station for plastic injection of the fourth color (or type) and related actions. Finally, turntable 2 drives the mold to rotate to 0-degree station, or turntable 2 It can continue to rotate from 240 degrees to 360 degrees, that is, to reach the same reset angle and prepare for the next new action cycle.

The above-mentioned servo power four-station turntable mechanism, the indexing method of this mechanism, the described turntable is set according to the 90-180 indexing type indexing positioning mechanism, and the 90-180 indexing type is set to 0 (360) degree, 90 Degree, 180 degrees, 270 degrees four working positions, including: 1. It can realize the two-station 180-degree rotary indexing mode, that is, the action cycle of 0-180-0/360 rotary indexing, and can inject two colors (or type) of plastic; 2. It can realize the three-station 90-degree rotary indexing mode, that is, the action cycle of 0-90-180-0/360 rotary indexing, and can inject three colors (or types) of plastic; 3. It can realize the four-station 90-degree rotary indexing mode, that is, the action cycle of 0-90-180-270-0/360 rotary indexing, and can inject four colors (or types) of plastics.

The servo-powered four-station turntable mechanism of the utility model adopts servo drive technology, which realizes quick response, energy saving and consumption reduction; the control system has output and feedback, which forms a complete closed-loop control system, realizes high-precision control, and improves production efficiency ;It is equipped with a locking and stopping device, which protects the safety of the mechanism and improves the service life; two types of rotary indexing are designed to provide customers with multi-station and multi-mode use options, which are rich and varied.

Description of drawings

The utility model will be further described in detail below in conjunction with the accompanying drawings. The dimensions and numerical values shown in the accompanying drawings are only for the convenience of explaining the utility model, and do not constitute any technical limitation to the utility model.

Fig. 1 is a schematic diagram of key components and control principles of the utility model;

Fig. 2 is a structural representation of the turntable of the present utility model;

Figure 3 is a schematic diagram of the distribution of concave holes for the 120-180 indexing type detection of the turntable;

Fig. 4 is the K direction view of Fig. 3;

Fig. 5 is a schematic diagram of the distribution of concave holes for the 90-180 indexing type detection of the turntable;

Fig. 6 is a schematic diagram of "time-rotational speed" when the turntable completes one indexing action;

Fig. 7 is the left-turn angle position signal table of the 120-180 indexing type of the turntable;

Fig. 8 is a left-turn angle position signal table of the 90-180 indexing type of the turntable.

In the figure: 1 is the bottom plate, 2 is the turntable, 3 is the linkage gear, 4 is the driving gear, 5 is the gear box, 6 is the servo motor, 7 is the upper pressing block, 8E, 8F, 8G, 8H are the slots, 9A, 9B, and 9C are round head induction switches, 10 is the right pressure block, 11 is the center shaft assembly, 12 is the left pressure block, 13M, 13N are square head induction switches, 14 is the positioning cylinder assembly, 15 is the bolt, and 16 is the Hydraulic direction valve, 17 is the servo driver, 18 is the control computer, 201 is the circular arc step of the turntable, 202 is the tooth step of the turntable, 203 is the induction zone of the round head induction switch 9C, 204 is the round head induction switch 9B and The sensing zones of 9A, 210, 211, 212, 213, 214, 215, 216, 217 are the indexing detection concave holes of the turntable.

Detailed ways

As shown in Figures 1 to 8, a servo-powered four-station turntable mechanism includes a bottom plate 1, a turntable 2, a central shaft assembly 11 and a servo motor 6, the turntable 2 is positioned at the center of the bottom plate 1 through the shaft assembly 11, and the servo motor 6 is arranged on the upper part of the base plate 1, installed on the input end of the gear box 5, through the action of the gear box 5, the speed is reduced and the torque is increased, and then the drive gear 4 installed on the output side of the gear box 5 drives the connecting The moving gear 3 meshes with the teeth 202 on the periphery of the turntable 2, and transmits the rotational speed and torque to the turntable 2, and drives the turntable 2 to rotate around the central shaft assembly 11 on the plane of the bottom plate 1; The pressing block 7, the right pressing block 10, and the left pressing block 12 form a certain closed space to protect the teeth 202 of the turntable 2 and prevent foreign matter in the production and use environment from falling into the teeth and causing damage; the turntable 2 is divided into four stations. An indexing and positioning action mechanism is provided in degrees, and an arc step 201 is arranged on the periphery of the turntable 2, and V-shaped positioning slots 8 (E, F, G, H) distributed at a specific angle are arranged at the arc step 201, Relatively fixed to the turntable 2, the slot 8 is provided with a V-shaped inner slope, and the left pressure block 12 relatively fixed to the bottom plate 1 is provided with a center line along the radial direction of the turntable 2. The positioning cylinder assembly 14, the piston rod of the cylinder assembly 14 The end is installed and connected with the latch 15 of the V-shaped outer inclined surface that matches the slot 8, and the latch 15 and the slot 8 form the indexing and positioning mechanism of the turntable 2.

At the pin 15, there are non-contact electromagnetic induction square head induction switches 13M and 13N fixed on the left pressing block 12, which are respectively used to detect the retraction and extension of the pin 15. When the pin 15 stretches out, it is inserted into any In the V-shaped inner slope of the slot 8, the turntable 2 is locked and stopped and cannot be rotated; when the latch 15 is retracted, the turntable 2 is unlocked and can be rotated.

The right pressure block 10 is provided with a non-contact electromagnetic induction round head induction switch 9 (A, B, C), and the circular arc step 201 of the turntable 2 is provided with detection recesses in a specific angle distribution suitable for the switch 9. holes (210, 211, 212, 213, 214, 215, 216, 217), the detection signals of the switch 9 are logically combined to determine the corresponding angular position of the turntable. The 120-180 division type has the signal combination listed in Table 1, and the 90-180 division type has the signal combination listed in Table 2. It can be seen that under different indexing types, the signal combinations of switches 9A, 9B, and 9C are unique and non-repetitive at specific angular positions of 0/360°, 90°, 120°, 180°, 240°, and 270° of. For the rest of the repetitive signal combinations that appear at non-specific angles, the program setting of the control computer 18 regards them as impurity signals and filters them out, and does not affect the determination of specific angles.

The detection concave holes 212, 214, 215, 217 are arranged in the induction zone 203 area, and the electromagnetic induction switch 9C is limited by the fixed position of the installation and the range of the electromagnetic induction magnetic field emitted by itself, and can only be obtained by induction in the 203 area zone. A change signal, a hole or a concavity in the area of the sensing zone 204 cannot cause the switch 9C to generate a change signal. As defined in this paper, when the switch 9 senses a metal substance, a digital sensing signal 1 is obtained; when the switch 9 is aligned with a concave hole or a concave surface (that is, no metal substance is sensed), a digital signal 0 is obtained. Therefore, when the turntable 2 rotates so that any one of the detection holes 212, 214, 215, 217 is aligned with the switch 9C, the switch 9C obtains a signal of 0, and the rest of the rotation positions of the turntable 2, the switch 9C obtains a signal of 1.

When the switch detects a concave hole, the light is off, the signal is 0, the switch detects metal, the light is on, the signal is 1, turn left, counterclockwise.

The detection concave holes 210, 211, 213, 216 are arranged in the area of the sensing zone 204. It is considered that the width of the circular step 201 of the turntable 2 is not too large, so that the thickness of the entire turntable mechanism is too large. Considering economical design , the concave slope of the slot 8 (E, F, G, H) overlaps with the zone 204, and the electromagnetic induction switches 9B and 9A are installed and fixed at the positions suitable for the induction zone 204, which can only be used in the zone 204. The change signal is obtained by internal induction, and the concave hole in the area of the sensing zone 203 cannot cause the switches 9B and 9A to generate a change signal. When the turntable 2 is rotated so that any hole of the detection concave hole 210, 211, 213, 216 is aligned with the switch 9B, or any concave slope of the slot 8E, 8F, 8G, 8H is aligned with the switch 9B, the switch 9B is obtained. Signal 0, the rotation position of the other turntable 2, the switch 9B obtains signal 1; when the turntable 2 rotates, make any hole of the detection concave hole 210, 211, 213, 216 align with the switch 9A, or the slot 8E, 8F, 8G When any concave slope of 1, 8H is aligned with the switch 9A, the switch 9A obtains the signal 0, and the other rotation positions of the turntable 2, the switch 9A obtains the signal 1.

The servo driver 17 receives the target instruction from the control computer 18, and through the module program conversion, outputs the PID control analog value to the servo motor 6, so that the servo motor 6 performs the rotation actions of starting, accelerating, stabilizing, decelerating, and stopping, and the servo motor 6 encoder pulse signals will be fed back to the control computer 18 to determine the angular position of the motor during rotation, thereby forming a closed-loop control system, showing smooth speed change at the speed inflection point as shown in Figure 6 The curve corresponds to the entire turntable mechanism, that is, it shows smooth speed change and no impact during start-stop, acceleration and deceleration.

The utility model designs two kinds of indexing types, among which the 120-180 indexing type is set with four working positions of 0 (360) degrees, 120 degrees, 180 degrees, and 240 degrees, which can realize the 180-degree rotating indexing mode of two stations, That is, the action cycle of 0-180-0/360 rotation indexing. For example, at the 0-degree station, after the injection molding machine completes the plastic injection of the first color (or type), the turntable 2 drives the mold installed on it to rotate to 180 degrees. The second color (or type) of plastic injection and related actions are carried out at the 0-degree station. After that, the turntable 2 drives the mold to rotate to the 0-degree station, or the turntable 2 can continue to rotate from 180 degrees to 360 degrees. At this time, the injection molding The machine has completed a production action cycle and can perform a new action cycle.

It can realize the three-station 120-degree rotary indexing mode, that is, the action cycle of 0-120-240-0/360 rotary indexing. For example, at the 0-degree station, the injection molding machine completes the plastic injection of the first color (or type) Finally, the turntable 2 drives the mold installed on it to rotate to the 120-degree station for plastic injection of the second color (or type), and then continues to rotate to the 240-degree station for the third color (or type) Finally, the turntable 2 drives the mold to rotate to the 0-degree position, or the turntable 2 can continue to rotate from 240 degrees to 360 degrees, that is, to reach the same reset angle and prepare for the next new action cycle .

It can realize the four-station rotary indexing mode, that is, the action cycle of 0-120-180-240-0/360 rotary indexing, and can inject four colors (or types) of plastics. The action mode is similar to the previous one and will not be repeated. .

Another 90-180 indexing type is set with four working positions of 0 (360) degrees, 90 degrees, 180 degrees, and 270 degrees, which can realize the two-station 180-degree rotary indexing mode, that is, 0-180-0/360 rotation The indexing action cycle can inject plastics of two colors (or types); it can realize the three-station 90-degree rotating indexing mode, that is, the action cycle of 0-90-180-0/360 rotating indexing can inject three different colors (or types) of plastic; it can realize the four-station 90-degree rotary indexing mode, that is, the action cycle of 0-90-180-270-0/360 rotary indexing, and can inject four colors (or types) plastic. The action modes of the two-station, three-station, and four-station are all similar as before, and will not be repeated.

Two types of indexing types and various station modes are available for customers to choose according to their needs according to the mold design type and injection molding production process and other conditions and factors.

Hereinafter, taking the turntable mechanism turning left to complete a basic rotation indexing action from 0° to 120° as an example, the action control form of the turntable mechanism will be described in detail.

When the turntable 2 is at the working position of 0 degrees, the signal logic combination of the round head sensor switches 9A, 9B, and 9C is 000; the V-shaped outer slope of the bolt 15 is completely attached to the inner slope of the slot 8F, and the square head sensor switch 13M The signal logic combination with 13N is 01, which is a locking signal; the servo motor 6 is in a stopped state, and its encoder signal is at the zero position identified by the built-in program of the control computer 18.

After the injection molding machine completes the relevant injection action at the 0-degree working position, according to the production process setting, the control computer 18 issues an instruction to require the turntable 2 to rotate counterclockwise from the 0-degree position to the 120-degree position. On the one hand, the hydraulic pressure The directional valve 16 receives and executes the command, controls oil to fill the rod cavity of the cylinder assembly 14, and withdraws the latch 15 from the V-shaped inner slope of the slot 8F until the signal combination of the switches 13M and 13N becomes 10 to unlock signal, the command of the hydraulic directional valve 16 is completed, the spool returns to the neutral position, the latch 15 has been retracted, and the turntable 2 is unlocked; on the other hand, the servo driver 17 receives the command and converts the output through the module program to control the servo motor 6 Start the rotation, drive the turntable 2 to rotate counterclockwise to the left, accelerate, change speed, and stabilize the speed according to the predetermined encoder pulse signal, until the deceleration brake reaches the predetermined 120-degree station pulse signal, and the combined feedback of the detection signals of switches 9A, 9B, and 9C When it is 010, the servo motor 6 stops rotating, and the turntable 2 stops rotating. So far, the turntable 2 has rotated counterclockwise from the 0-degree station to the 120-degree station.

At this time, the control computer 18 issues an instruction, and the hydraulic directional valve 16 controls the oil filling into the rodless chamber of the cylinder assembly 14, pushes the latch 15 into the inner slope of the slot 18E, and the signal combination to the switches 13M and 13N becomes 01 lock signal, turntable 2 is positioned and locked, and cannot be rotated, then the injection molding machine can carry out related production actions at the 120-degree station.

The turntable mechanism adopts servo drive technology, which realizes quick response, energy saving and consumption reduction; the control system has output and feedback, forming a complete closed-loop control system, which realizes high-precision control and improves production efficiency; it is equipped with a locking stop device , to protect the safety of the mechanism and improve the service life; two types of rotary indexing are designed to provide customers with multi-station and multi-mode use options, which are rich and varied.

In summary, the utility model has produced the actual finished product as shown in the manual and the chart, and has achieved the expected purpose of the utility model through production use and testing, which can prove that the utility model conforms to the actual production and has practical value. The above-mentioned embodiments are only used to facilitate the description of the utility model, and are not intended to limit the utility model in any form. Anyone with ordinary knowledge in the technical field, if within the scope of the technical characteristics involved in the utility model, Equivalent embodiments that are partially modified or modified by using the technical content disclosed in the utility model do not deviate from the technical features of the utility model, and are considered to still belong to the category of the utility model's technical features.

Claims (6)

1. A servo-powered four-station turntable mechanism, which mainly includes a base plate (1) as the carrier body of the entire turntable mechanism, a turntable (2) as the working platform of the entire turntable mechanism, a central shaft assembly (11) and a servo motor (6) , the turntable (2) is positioned at the center of the bottom plate (1) through the shaft assembly (11), and a linkage gear (3) is arranged on the periphery of the turntable (2), and the linkage gear (3) and the circumference of the turntable (2) The teeth (202) on the edge are meshed to transmit the speed and torque to the turntable (2), and the turntable (2) is driven to rotate around the shaft assembly (11) on the plane of the bottom plate (1), and is fixed on the edge of the bottom plate (1) Upper pressing block (7), right pressing block (10), left pressing block (12) and lower pressing block are provided, upper pressing block (7), right pressing block (10), left pressing block (12) and lower pressing block Blocks form a certain closed space; four stations are set along the circumference of the turntable (2), and the circumference of the turntable (2) is provided with arc steps (201). At the arc steps (201), the turntable (2) An indexing and positioning action mechanism with four stations is set, and the indexing and positioning action mechanism includes four V-shaped positioning slots (8E, 8F, 8G, 8H) at the circular arc steps (201), four V-shaped positioning slots (8E, 8F, 8G, 8H) are distributed according to the corresponding angles of the four stations. On the left side of the bottom plate, there is a positioning oil cylinder assembly (14) along the center line along the radial direction of the turntable (2), and the piston of the oil cylinder assembly (14) The rod end is installed and connected with a V-shaped latch (15), and the latch (15) and the slot (8) form the indexing and positioning action mechanism of the turntable (2). 2. The servo power four-station turntable mechanism according to claim 1, characterized in that: at the V-shaped pin (15), there are non-contact electromagnetic induction type square head induction switches (13M, 13N), respectively used for Detect the retraction and extension of the pin (15). When the pin (15) is retracted, the turntable (2) is unlocked and can be rotated; when the pin (15) is stretched out and inserted into the V-shaped inner slope of the slot (8), the turntable (2) It is locked and stopped and cannot be rotated. 3. The servo power four-station turntable mechanism according to claim 1, characterized in that: a non-contact electromagnetic induction type round head induction switch (9A, 9B, 9C) is arranged at the right pressing block (10), Eight detection concave holes (210, 211, 212, 213, 214, 215, 216, 217) adapted to the switches (9A, 9B, 9C) are arranged at the circular arc steps (201) of the turntable (2). The holes (210, 211, 212, 213, 214, 215, 216, 217) are distributed according to the corresponding angles of the four stations, and the detection signals of the switches (9A, 9B, 9C) are logically combined to determine the corresponding turntable indexing. Location. 4. The servo-powered four-station turntable mechanism according to claim 1, wherein the angular distribution of the four-stations of the indexing and positioning mechanism includes 120-180 indexing type and 90-180 indexing type. 5. The servo power four-station turntable mechanism according to claim 4 is characterized in that: the 120-180 indexing type has four working positions of 0/360 degree, 120 degree, 180 degree and 240 degree, including: The 180-degree rotary indexing working mode of the station is the action cycle of 0-180-0/360 rotary indexing; the 120-degree rotary indexing working mode of the three stations is 0-120-240-0/360 rotary indexing The action cycle; in the four-station rotary indexing mode, that is, the action cycle of 0-120-180-240-0/360 rotary indexing. 6. The servo power four-station turntable mechanism according to claim 4, characterized in that: the 90-180 indexing type has four working positions of 0/360 degrees, 90 degrees, 180 degrees, and 270 degrees, including two stations 180-degree rotary indexing mode, that is, the action cycle of 0-180-0/360 rotary indexing; in the three-station 90-degree rotary indexing mode, that is, the action of 0-90-180-0/360 rotary indexing Cycle; in the four-station 90-degree rotary indexing mode, that is, the action cycle of 0-90-180-270-0/360 rotary indexing.