Transmission speed automatic adjustment control circuit

Abstract

The invention provides a transmission speed automatic adjustment control circuit. The three detection branches detect whether there are transmitted articles at three positions on the transmission line and send out position detection signals when detecting the articles. The three speed regulation branches comprise resistors R1, R2 and R3 and relays K1, K2 and K3, electromagnetic coils of the relays receive position detection signals sent by the detection branch, and normally open contacts are closed when receiving the position detection signals. The output branch comprises a resistor R4 and a resistor R5, and a control signal output port is arranged between the resistor R4 and the resistor R5. On one hand, the conveying speed can be automatically and gradually increased when article conveying begins, it can be guaranteed that articles are stably placed, it can be guaranteed that the articles are conveyed at a high speed when the number of the conveyed articles is the maximum, and the conveying efficiency is improved; on the other hand, the transmission speed can be automatically and gradually reduced when transmission is about to be finished, the transmission mechanism can stably stop at a low speed when transmission is finished, and mechanical structure damage caused by high-speed sudden stop is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of speed control circuits, and in particular relates to a transmission speed automatic adjustment control circuit. Background Art

[0002] In the existing object transmission control, uniform speed control is usually adopted. This control method is simple to control, but the transmission speed is fixed, which has the following problems: if the transmission speed is too fast, the object may not be placed stably at the beginning of the transmission, and at the end of the transmission, the too fast speed may cause the transmission mechanism to be unable to stop stably or even stop suddenly. The transmission mechanism suddenly changes from a high-speed state to a static state, which is likely to cause damage to the mechanical structure; on the other hand, if the transmission speed is too low, it will affect the efficiency of object transmission and fail to achieve efficient transmission effect. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the prior art adopts uniform speed control to control the transmission of items, which leads to instability of the items at the beginning of transmission and the inability of the transmission mechanism to stop stably or low transmission efficiency at the end of transmission. A transmission speed automatic adjustment control circuit is provided, which can automatically increase the transmission speed gradually at the beginning of the transmission of items to ensure stable placement of the items, and transmit the items at high speed when the number of items is the largest to improve the transmission efficiency. The transmission speed can also be automatically reduced gradually when the transmission is about to end, ensuring that the transmission mechanism can stop stably at a low speed at the end of the transmission.

[0004] To achieve the above purpose, the technical solution provided by the present invention is:

[0005] The present invention provides a transmission speed automatic adjustment control circuit, comprising three position detection branches, three speed regulation branches and an output branch;

[0006] The three detection branches are used to detect whether there are transmission objects at the initial position, the middle position and the terminal position set from near to far on the transmission route, and send out a position detection signal when the transmission object is detected;

[0007] The three speed regulating branches each include a resistor and a relay for controlling the on and off of the corresponding detection branch, which are respectively a resistor R1 and a relay K1, a resistor R2 and a relay K2, and a resistor R3 and a relay K3. One end of the electromagnetic coil of the relays K1, K2, and K3 is used to receive the position detection signal sent by the detection branch, and the other end is grounded; the contacts of the relays K1, K2, and K3 are normally open, and are closed when the position detection signal is received, and one end of the contact is respectively connected to one end of the corresponding resistor R1, R2, and R3, and the other end of the resistors R1, R2, and R3 is grounded;

[0008] The output branch is used to output a control signal for controlling the transmission speed, and includes resistors R4 and R5. One end of the resistor R5 is connected to the positive pole of the power supply, and the other end is connected to one end of the resistor R4 and the other end of the contacts of relays K1, K2, and K3. The other end of the resistor R4 is grounded, and a control signal output port is provided between the resistor R4 and the resistor R5.

[0009] Furthermore, the automatic adjustment process of the control circuit to the object transmission speed is:

[0010] Step 1: When the transmission of the item has not started, the three position detection signals are invalid, the speed regulating branch does not work, R5 and R4 are connected in series, the control signal output by the circuit is the voltage at the connection point of R5 and R4, and the transmission speed is the lowest speed;

[0011] Step 2, the initial position detection signal is valid, the relay K1 is activated, the path where the resistor R1 is located is connected, the resistors R1 and R4 form a parallel circuit, the parallel resistance is reduced, the voltage at the connection with the resistor R5 increases, the voltage of the output control signal increases, and the transmission speed increases;

[0012] Step 3, the initial position detection signal and the intermediate position detection signal are valid, the relays K1 and K2 are actuated, the paths where the resistors R1 and R2 are located are connected, the resistors R1, R2 and R4 form a parallel circuit, the parallel resistance is further reduced, the voltage at the connection with the resistor R5 increases again, the voltage of the output control signal increases again, and the transmission speed increases again;

[0013] Step 4, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all valid, the relays K1, K2 and K3 are actuated, the paths where the resistors R1, R2 and R3 are located are connected, the resistors R1, R2, R3 and R4 form a parallel circuit, the parallel resistance reaches the minimum, the voltage at the connection with the resistor R5 reaches the maximum, the voltage of the output control signal reaches the maximum, and the transmission speed reaches the highest;

[0014] Step 5, when the transmission of the object is about to end, first, the initial position detection signal is invalid, the relay K1 stops working, the path where the resistor R1 is located is disconnected, the resistors R2, R3 and R4 form a parallel circuit, the parallel resistance increases, the voltage of the output control signal becomes smaller, and the transmission speed decreases;

[0015] Step 6, the initial position detection signal and the intermediate position detection signal are invalid, the relays K1 and K2 stop operating, the paths where the resistors R1 and R2 are located are disconnected, the resistors R3 and R4 form a parallel circuit, the parallel resistance increases again, the voltage of the output control signal decreases again, and the transmission speed decreases again;

[0016] Step 7, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all invalid, the relays K1, K2 and K3 all stop working, the paths where the resistors R1, R2 and R3 are located are disconnected, the voltage of the output control signal reaches the minimum, and the transmission speed reaches the lowest.

[0017] The advantages of the present invention are:

[0018] The transmission speed automatic adjustment control circuit of the present invention has three detection branches that can detect whether there are transmission items at three positions from near to far on the transmission route. The three speed regulating branches, each including a resistor and a relay, can be turned on and off according to the position detection signal of the detection branch. When turned on, the corresponding resistor is connected in parallel, the total resistance of the circuit is reduced, and the output voltage is increased, thereby increasing the transmission speed of the transmission mechanism. When turned off, the corresponding speed regulating branch does not work, the total resistance of the circuit is increased, the output voltage is reduced, and the transmission speed is reduced. Therefore, on the one hand, the present invention can automatically increase the transmission speed gradually as the number of transmission items increases at the beginning of the transmission of items, which can not only ensure the stable placement of the items, but also ensure that the items are transmitted at high speed when the number of transmission items is the largest, thereby improving the transmission efficiency; on the other hand, it can automatically reduce the transmission speed gradually as the number of transmission items decreases when the transmission is about to end, thereby ensuring that the transmission mechanism can stop stably at a low speed at the end of the transmission, thereby avoiding damage to the mechanical structure caused by a high-speed emergency stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a principle diagram of the transmission speed automatic adjustment control circuit of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0022] The invention provides a transmission speed automatic adjustment control circuit, which is used for automatically adjusting the transmission speed during the transmission of objects.

[0023] Reference Figure 1 As an exemplary embodiment of the present invention, the transmission speed automatic adjustment control circuit includes three position detection branches, three speed regulation branches and an output branch.

[0024] The three detection branches are used to detect whether there are transmitted items at the initial position, intermediate position and terminal position set from near to far on the item transmission route, and are not shown in the figure. For this, sensors can be set at the three corresponding positions of the transmission route. When the sensor detects that there are items on the transmission route, the detection branch will send out position detection signals, which are position detection signal 1, position detection signal 2 and position detection signal 3.

[0025] The three speed regulating branches each include a resistor and a relay for controlling the on and off of the corresponding detection branch, which are resistor R1 and relay K1, resistor R2 and relay K2, and resistor R3 and relay K3. One end of the electromagnetic coil of relays K1, K2, and K3 is used to receive the position detection signal sent by the detection branch, and the other end is grounded. The contacts of relays K1, K2, and K3 are normally open, and are closed when receiving the position detection signal, and one end of the contact is connected to one end of the corresponding resistor R1, R2, and R3, respectively, and the other end of the resistor R1, R2, and R3 is grounded.

[0026] The output branch is used to output a control signal for controlling the transmission speed, and includes resistors R4 and R5. One end of the resistor R5 is connected to the positive pole of the power supply, and the other end is connected to one end of the resistor R4 and the other end of the contacts of relays K1, K2, and K3. The other end of the resistor R4 is grounded, and a control signal output port is provided between the resistor R4 and the resistor R5.

[0027] The control process of the control circuit of the present invention for automatically adjusting the transmission speed of items is as follows:

[0028] When the item transmission starts, the number of items on the transmission route gradually increases. The speed adjustment process is as follows:

[0029] Step S1, when the transmission of the item has not started, the three position detection signals are invalid, the speed regulating branch does not work, R5 and R4 are connected in series, the control signal output by the circuit is the voltage at the connection point of R5 and R4, and the transmission speed is the lowest speed;

[0030] Step S2, the initial position detection signal is valid, the relay K1 is actuated, the path where the resistor R1 is located is connected, the resistors R1 and R4 form a parallel circuit, the parallel resistance is reduced, the voltage at the connection with the resistor R5 is increased, the voltage of the output control signal is increased, and the transmission speed is improved;

[0031] Step S3, the initial position detection signal and the intermediate position detection signal are valid, the relays K1 and K2 are actuated, the paths where the resistors R1 and R2 are located are connected, the resistors R1, R2 and R4 form a parallel circuit, the parallel resistance is further reduced, the voltage at the connection with the resistor R5 increases again, the voltage of the output control signal increases again, and the transmission speed increases again;

[0032] Step S4, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all valid, the relays K1, K2 and K3 are actuated, the paths where the resistors R1, R2 and R3 are located are connected, the resistors R1, R2, R3 and R4 form a parallel circuit, the parallel resistance reaches the minimum, the voltage at the connection with the resistor R5 reaches the maximum, the voltage of the output control signal reaches the maximum, and the transmission speed reaches the highest.

[0033] It can be seen that when the items are just being transported, the transmission speed automatically increases gradually with the increase in the number of items being transported, so that the items can be placed stably when the transportation mechanism such as the conveyor belt is at a lower speed. When the number of items on the transmission route reaches the maximum, the item transmission speed is the fastest. At this time, maintaining the highest speed to transport the items can ensure efficient transmission of the items.

[0034] When the item transmission is about to end, the number of items transmitted on the transmission route gradually decreases. The speed adjustment process in this process is:

[0035] Step S5, when the transmission of the object is about to end, first, the initial position detection signal is invalid, the relay K1 stops operating, the path where the resistor R1 is located is disconnected, the resistors R2, R3 and R4 form a parallel circuit, the parallel resistance increases, the voltage of the output control signal becomes smaller, and the transmission speed decreases;

[0036] Step S6, the initial position detection signal and the intermediate position detection signal are invalid, the relays K1 and K2 stop operating, the paths where the resistors R1 and R2 are located are disconnected, the resistors R3 and R4 form a parallel circuit, the parallel resistance increases again, the voltage of the output control signal decreases again, and the transmission speed decreases again;

[0037] Step S7, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all invalid, the relays K1, K2 and K3 all stop working, the paths where the resistors R1, R2 and R3 are located are disconnected, the voltage of the output control signal reaches the minimum, and the transmission speed reaches the lowest.

[0038] It can be seen that when the transmission of items is about to end, the transmission speed will automatically decrease gradually as the number of transmitted items decreases, which can ensure that the transmission mechanism stops stably at a low speed when the transmission is completed, thereby avoiding damage to the transmission mechanism due to an emergency stop at high speed.

[0039] Therefore, as described above, in the present invention, three detection branches can detect whether there are no transmission items at three positions from near to far on the transmission route, and three speed regulating branches each including a resistor and a relay can be turned on and off according to the position detection signal of the detection branch. When turned on, the corresponding resistor is connected in parallel, the total resistance of the circuit is reduced, and the output voltage is increased, thereby increasing the transmission speed of the transmission mechanism. When turned off, the corresponding speed regulating branch does not work, the total resistance of the circuit is increased, the output voltage is reduced, and the transmission speed is reduced. Therefore, on the one hand, the present invention can automatically increase the transmission speed gradually as the number of transmission items increases at the beginning of the transmission of items, which can not only ensure the stable placement of the items, but also ensure that the items are transmitted at high speed when the number of transmission items is the largest, thereby improving the transmission efficiency; on the other hand, it can automatically reduce the transmission speed gradually as the number of transmission items decreases when the transmission is about to end, ensuring that the transmission mechanism can stop stably at a low speed at the end of the transmission, thereby avoiding damage to the mechanical structure caused by a high-speed emergency stop.

[0040] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A transmission speed automatic adjustment control circuit, characterized in that: It includes three position detection branches, three speed regulation branches and an output branch; The three detection branches are used to detect whether there are transmission objects at the initial position, the middle position and the terminal position set from near to far on the transmission route, and send out a position detection signal when the transmission object is detected; The three speed regulating branches each include a resistor and a relay for controlling the on and off of the corresponding detection branch, which are respectively a resistor R1 and a relay K1, a resistor R2 and a relay K2, and a resistor R3 and a relay K3. One end of the electromagnetic coil of the relays K1, K2, and K3 is used to receive the position detection signal sent by the detection branch, and the other end is grounded; the contacts of the relays K1, K2, and K3 are normally open, and are closed when receiving the position detection signal, and one end of the contact is respectively connected to one end of the corresponding resistor R1, R2, and R3, and the other end of the resistors R1, R2, and R3 is grounded; The output branch is used to output a control signal for controlling the transmission speed, and includes a resistor R4 and a resistor R5. One end of the resistor R5 is connected to the positive electrode of the power supply, and the other end is connected to one end of the resistor R4 and the other end of the contacts of the relays K1, K2, and K3. The other end of the resistor R4 is grounded, and a control signal output port is provided between the resistor R4 and the resistor R5.

2. The transmission speed automatic adjustment control circuit according to claim 1, characterized in that: The automatic adjustment process of the control circuit to the transmission speed of the items is as follows: Step 1: When the transmission of the item has not started, the three position detection signals are invalid, the speed regulating branch does not work, R5 and R4 are connected in series, the control signal output by the circuit is the voltage at the connection point of R5 and R4, and the transmission speed is the lowest speed; Step 2, the initial position detection signal is valid, the relay K1 is activated, the path where the resistor R1 is located is connected, the resistors R1 and R4 form a parallel circuit, the parallel resistance is reduced, the voltage at the connection with the resistor R5 increases, the voltage of the output control signal increases, and the transmission speed increases; Step 3, the initial position detection signal and the intermediate position detection signal are valid, the relays K1 and K2 are actuated, the paths where the resistors R1 and R2 are located are connected, the resistors R1, R2 and R4 form a parallel circuit, the parallel resistance is further reduced, the voltage at the connection with the resistor R5 increases again, the voltage of the output control signal increases again, and the transmission speed increases again; Step 4, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all valid, the relays K1, K2 and K3 are actuated, the paths where the resistors R1, R2 and R3 are located are connected, the resistors R1, R2, R3 and R4 form a parallel circuit, the parallel resistance reaches the minimum, the voltage at the connection with the resistor R5 reaches the maximum, the voltage of the output control signal reaches the maximum, and the transmission speed reaches the highest; Step 5, when the transmission of the object is about to end, first, the initial position detection signal is invalid, the relay K1 stops working, the path where the resistor R1 is located is disconnected, the resistors R2, R3 and R4 form a parallel circuit, the parallel resistance increases, the voltage of the output control signal becomes smaller, and the transmission speed decreases; Step 6, the initial position detection signal and the intermediate position detection signal are invalid, the relays K1 and K2 stop operating, the paths where the resistors R1 and R2 are located are disconnected, the resistors R3 and R4 form a parallel circuit, the parallel resistance increases again, the voltage of the output control signal decreases again, and the transmission speed decreases again; Step 7, the initial position detection signal, the intermediate position detection signal and the end position detection signal are all invalid, the relays K1, K2 and K3 all stop working, the paths where the resistors R1, R2 and R3 are located are disconnected, the voltage of the output control signal reaches the minimum, and the transmission speed reaches the lowest.

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