CS211354B2 - Connection for directional and target dependent automatic propulsion control - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring for directional and target dependent automatic drive control, in particular for a lift conveyor device traveling on a forced path, comprising a switching device for determining the actual position of said device and a switching device for destination selection. or a group of resistors, the second poles of the circuit for this actual position determination are connected to one of the poles, preferably the grounded pole of the power supply, the second poles of the target selection circuit are connected to the second pole of the power supply and part of the switching device for determining the actual position is connected via valves connected to a matrix, preferably a diode, to a part of the switching device for selecting the target location.

Direction and distance maintenance devices are the basic means of automatic drive control. A number of important requirements are placed on these devices. The device should be able to automatically connect the drive to its arbitrary point and disconnect it from any point of the track, which is programmable from the point of view of control, or to supply it with a unique analog signal for the actuator. The device should further provide movement according to a predetermined path-time diagram, including the function of the actual position and distance of a particular destination. The path-time diagram is to be variable (adjustable) using simple means and methods.

There are known devices which automatically control the drive of a lift conveyor moving on a forced path, in which, at normal traffic speed in the vicinity of the target, it is switched to a reduced speed according to the prescribed road-time diagram, which is necessary to reduce transport time. In fact, the maximum permissible speed must be maintained until the conveyor device comes close to the target, since the speed then needs to be reduced in the interests of smooth decommissioning.

Known control devices are for example provided with circuits in which there are means of determining position, means an excitation signal as a function of actual position and intended destination ¹ and actuators controlled by the control signals, and additionally comprising means defining the position of the resistive divider. Each end of the chain is connected with one end of the switching devices connected to equidistant sensors positioned sequentially along the path. The free ends of the switching circuits are connected to one pole of the power supply. The divider nodes located in the positioning device are also connected to switching devices which are suitable for selecting a particular destination and are successively connected to said switches corresponding to equidistant path positions, and the free ends of these switching devices are also connected to one output of the working resistor, the second terminal of the working resistor being connected to the other pole of the power supply.

With this solution, voltage differences occur at nodal points due to external control signals, which are connected to the control electronics in the form of analog signals. The operational behavior of the circuit corresponds to the mathematical function:

x means that when the resistive divider proceeds from one end point to the b-o-d of the other, the difference between the voltages of the two adjacent knot throws is variable and is getting smaller.

This implies that the circuit can only use a steep initial section of the characteristic expressed by a mathematical function. As a result, any operator that is intended to result in directional control of the drive from any b-o-run path to any other point can only be accomplished by moving the corresponding starting point of the coordinate system and its continuous translation.

Only certain stages of the analog signal can be estimated with reasonable certainty. The occurrence of a defect on any member in a series of connected resistance chains can result in partial inability to operate. in the function of determining the actual position and the selected destination or in determining the opposite direction of movement than desired.

Due to the requirement for gradual and symmetrical construction, there is no possibility of automatic switching on and off of the speed limit within the programmable path in individual cases.

The invention is based on the finding that, instead of a resistance chain, a matrix circuit with a number of elements is built which corresponds to the requirements specified by the path-time diagram. In this case, it is possible to overcome the drawbacks of the known devices without diminishing their advantages.

These shortcomings are eliminated in the circuit according to the invention, which consists in that the resistors or resistor groups connecting the switching device for determining the actual position of the lifting conveyor device and the switching device for selecting the target location are arranged in a matrix in in series with valves, preferably diodes, and each switching device for selecting a target location, preferably a program memory, is connected separately via resistors and via means permitting unidirectional current flow, preferably diodes, to the switching circuits of the device for determining the actual position of the device, preferably sensors or parts thereof, wherein the program memories corresponding to the end positions of the device are connected to one branch, while the program memories corresponding to the inter-media positions of the device are connected to two mutually parallel sets of branches.

A number of other features are within the scope of the invention. Downstream of the program memories, which correspond to the inter-media positions, there is one resistor and one means allowing one-way current flow, in particular di-oda, in each of the two parallel branch systems.

The individual program memories are connected to a position sensor corresponding to a particular device position, which is determined by the program memory for each branch of the parallel branch set via a means allowing a unidirectional current flow, in particular, through the diodes.

Each position sensor immediately preceding the position sensor which corresponds to the position of the device determined by the program memory or a part thereof, is connected to a parallel set of branches for each position sensor immediately following the means permitting unidirectional current flow, in particular a diode and a resistor. after a position sensor corresponding to the position determined by the program memory or a part thereof, it is connected via a means allowing a unidirectional flow of the pro-ue, in particular, a diode and a resistor, to a second parallel set of program memory branches.

The parallel branch set is connected to the output of decreasing direction and speed through the means allowing the unidirectional current flow, in particular: the diodes are connected to the output of the decreasing direction. and speed.

The advantage of the circuitry according to the invention is, in enabling this device to automatically switch on or off within the programmable path if speed limitations are required.

Since several current paths can also be connected between any program memory and the position sensor, the main movements can be controlled according to the time-path diagram in opposite directions. Such requirements have previously been encountered, for example, in warehouse unloading devices because, due to the geometrical modification, the braking distances, especially in the case of lifting devices, are highly dependent on the n-direction of movement. It is not possible to solve these problems by the known control devices so that an acceleration corresponding to the least advantageous state had to be chosen.

The invention is explained in more detail by way of example with reference to the drawing, which is a schematic diagram.

The drawing shows an exemplary embodiment in which the number of program memories a is

2113S4 position sensors always equal to six. However, the invention is not limited to the present exemplary embodiment, for example, the number of program memories and position sensors may differ from each other, i.e. be greater or less than six.

In the drive control shown as an example in the drawing, the switching devices for selecting the target location, in particular the program memory Pi ... Ps, are connected with the switching circuits for determining the actual position of the device, in particular the position sensors Ht ... Hs. With the exception of the two external program memories Pi and P6, all other program memories P2 ... Ps corresponding to the inter-media positions are connected to two parallel sets of branches ez. -. es or I12 ... hs, of which the branches e2 ... es serve to select movement in one direction and the other branches hz ... hs to select movement in the other direction. With each program memory Pi ... ε, there is a parallel set of ez .. es,

I12 ... hs in series connected resistor R _e i ... R _e s, R _h i ... Β ,, δ. Resistors R _e 2 ... R _e s, R 1, 2 ... RhS, which are connected to the program memories P2 ... P5 corresponding to the multimedia positions, are connected to means allowing unidirectional flow, preferably to diodes D _e 2. .. D _e 5, D _h 2 ... D _h s, which prevent the current circuit allowing movement in the other direction from closing in one direction. The individual program memories P1 are connected to position sensors Hj which correspond to the selected position i, for each branch e _b or hj, by means of direct current flow, in particular diodes D _e ii or D _hii . For example, let be i-3. In this case, the program memory P3 is connected to the position sensor Hs by means of diodes D _e .ss or D _h , 3.3.

Each position sensor Η, -ζ, Hj_i, or. its part which immediately precedes the position sensor, Hj, corresponding to a certain position i determined by the program memory P _{i (} connected via means allowing unidirectional flow, especially diodes ... D _e , i, i_2, D _ei i »1 and resistors. , R _e , i, i-2, R _e , i, il with one parallel set of ei branches, while position sensors H _{i +} i, H _{i +} 2, or portions thereof immediately following position sensor H ', are via means permitting unidirectional flow, in particular diodes D _h , i, i + 1, D _hli , _{i +} 2 and resistors .. Rh, i, i + i, Rh, i, i + 2, connected to a second parallel set of branches hi and these sensors are connected to the program memory P1.

According to the present example, position sensors Hi, Hz are connected to one branch via diodes D _e , i, 3, D _e , 2,3 and resistors R _e , i, 3, R _e , 2,3 or to the other branch via diodes D _h , 4.3, D _h , 5? 3 and D _h , 6.3 and resistances R _h , 4.3, Rh, 5.3, Rh, 6.3, and exactly to program memory P3.

One parallel set of branches ei ... es is connected via means allowing unidirectional flow, in particular diodes D _e , i.

D _e , 5, in reduced direction and speed to terminal A 1, while the second set of parallel branches I12 ... h6 is through means permitting unidirectional flow, in particular diodes D _h , z. ·. D _h , 6, connected in increasing direction and speed and connected to terminal Az.

The second outputs of the Hi ... H6 rental sensors are connected mainly to the zero supply potential, voltage Bi, the second outputs of the program memories Pi ... Ps are connected mainly to the positive pole of the supply voltage B2.

The circuit according to the invention works as follows: According to the target information specified by the program, the lifting conveyor device must be brought to the position indicated by position number 5. By command of the program memory Ps, this memory is connected statically to the positive pole of supply voltage B2.

The circuit is closed, from the positive pole of the supply voltage B2 through the program memory Ps, the resistance R _e s, the diodes D _e s, D _e 5, D _{e a} , D _e 3, D _e z, D _e ii and the position sensor Hi to zero potential of the power supply Bi. There is also zero potential at the output Ai of decreasing direction and speed.

The second branch of the current circuit closes from the program memory P5 through the resistance R _h s, the diodes D _h 5 and D _h s to the increasing output Az of direction and speed, the voltage difference between zero potential Bi and output Az of increasing direction and speed A as long as the full speed command is reached until the device reaches the target up to the distance determined by the circuit, in the described case, to the third before the target.

The lifting conveyor device is thus moved from position 1 to position 5. Once it reaches position 2, the position sensor H1 is separated and the position sensor Hz is closed. Thus, as the motion begins, the periodically static conductive state of the position sensors travels to an increasing local value.

With the connection of the Hz position sensor, the first current circuit is closed via the following elements: positive pole Bz of the supply voltage, program memory Ps, resistor R _e s, diodes D _e 5, D _e s, D _e 4, D _e 3, D _e zz, position sensor H2, zero potential Bi. There is an unchanged zero voltage at the output Ai of decreasing direction and speed.

On the other hand, the second current circuit changes in the order of the positive voltage of the supply voltage Bz, the program memory P5, the resistance Ř _h s, the diode D _h 5.2, the position sensor Hz, the zero potential Bi. A lower voltage appears at the output Az of the increasing direction and speed compared to the previous state. Indeed, the voltage at the output of increasing direction and speed is, in comparison to U _n = U _t, in the previous state.

By changing the first current circuit, it can be further demonstrated that the voltage at the output Ai of decreasing direction and speed Ai always remains zero, while the voltage at the output

A2 increasing direction and speed from position to position decreases with the corresponding choice of resistance value.

When the device reaches position 3, a second current path to program memory Ps is generated as follows: Resistor R _h s diode D _h 5.3 diode D _h 5.3j position sensor H3, zero potential Ρ. In this case, there is a voltage at the output of increasing direction and speed

U _n 3 = U _t

Rh5,3

Rh5 - (- Rh5.3

Second circuit in position 4: Resistor R _h 5, diode D _h s, resistor R _b 5.3, diode D _h 5, s, potentiometer · Hd, zero potential Bi.

The voltage at the output of increasing direction and speed is

U '4 = U _t

Rh5,4

Rh54 ~ Rh5.4

R _h 5, diode D _h 5, diode D _h 5.5, position sensor · Hs, zero potential Bi. Thus, the output of increasing direction and speed Aa will be zero voltage, which means a shutdown command for the drive. As follows from the above relations, where by determining any descending values of resistances R _h 5, a, R _h s, 3 and R _h s, 4 and by correspondingly selecting ratios of these resistances and resistor R _h s, reducing voltage.

According to an exemplary embodiment, a so-called pre-signal, which serves to control the drive, is used for the two-sided viewing of the output destination at different voltage levels. These steps can be increased in principle without limitations, the number of pre-signals pertaining to individual destinations can also be arbitrarily selected depending on the direction of approach.

Second circuit in position 5: Resistance

Claims (5)

SUBJECT 1. Wiring for directional and target-dependent automatic drive control, in particular for a positive-lift conveyor device, comprising a switching device for determining the actual position of said device and a target selection switch whose circuits are connected to each other by means of resistors or groups of resistors, wherein the second poles of the circuit for determining the actual position are connected to one of the poles, preferably the grounded pole of the power supply, the second poles of the target selection circuit are connected to the second poles of the power supply and the switching device for determining the actual position is connected via valves connected in a matrix, preferably a diode, to the parts of the switching device for selecting the target location, characterized in that the resistors or resistor groups (R _e i ... R _e 5, Rhi). .. ... R _h s, R _e 2 ... R _e 5, R _h 2 ... R _h 5), connecting the switching device for · determining the actual position of the lifting conveyor · device and the switching device for selecting the destination, are arranged in the matrix in series with the valves, preferably diodes, and each switching device for selecting the target location, preferably the program memory (Pi ... Pe), is connected separately via resistors t Rel · · Re5, Rhl · · Rh6, Re2. . . R _e 5, Rh 2. ... R _h 5) and, via means allowing unidirectional current flow, preferably a diode (D _e 2 ... D _e 5, D _h 2 ... D _h , s - i) with the switching circuits of the device for determining the actual position devices, preferably position sensors (Ηι.,. Ηβ) or parts thereof, the program memories [ΡΙ.,. Ρη] corresponding to the device positions are connected to one branch, while the program memories (P2 ... P5) corresponding to the multimedia the positions of the devices are only associated with ¹ two parallel sets of branches (es ... es, hz ... hs). 2. Connection according to claim 1, characterized in that after the program memories (ez.-.es, h2 ... h5) which correspond to the inter-media positions (P2 ... P _n -i), it is located in each of the two parallel sets of branches (ez.-.es, h2 ... hs) always one resistor (R _e 2, Rh 2 ... R _e , R _h , _n -1) and · always one means allowing one-way current flow, especially a diode (D _e 2, D _h 2 · · · Dem 1, Djj, _n -l). Connection according to Claims 1 and 2, characterized in that the individual program memories (P1) are connected to a position sensor (H _s ) corresponding to a specific position (i) which is determined by the program memory (P ₍ )) for each branch (ej, hj of the parallel set via means allowing unidirectional current flow, in particular via diodes (D _e ij and D _h ij, respectively). Connection according to claim 3, characterized in that each position sensor (... Hj_2, Hj-i) immediately preceding the position sensor (Hj) corresponding to the position (i) determined by the program memory (Pi), or a part thereof, is through a means allowing a unidirectional current flow, in particular a diode (... D _{e) i2} , j, D _eii -i, i) and a resistance (... R _e , i_2, _{1 (} R _{e (i-} i, i), connected to one parallel set of branches (e ^ and each position sensor (H ₁₊ i, H _{i +} 2 ...) immediately following the position sensor (Ht), which corresponds to the position (1) determined by the program memory (Pj) ), or a part thereof, is connected via a means allowing unidirectional current flow, in particular a diode (D _h , ₁₊ i, i, further D _h , _{i +} 2, i ...) and resistance (Rm + u Rh, i + 2, i, ...), on the second parallel set of branches (hj) of the program memory (P1). Connection according to one of Claims 1 to 4, characterized in that the parallel set of branches (ea ···.. E _n- 1) is via means permitting unidirectional current flow, in particular diodes ( _a D _e , i.). _and De, "- i), connected to the output (Ai] of decreasing direction and velocity while the second parallel set of branches (h2 ... h _n ) is via means permitting unidirectional current flow, especially diodes ( _a D _h , 2) ... ... _and D _h , ⁿ ) connected to the output (Az) of increasing direction and speed.