Low-speed protection device applied to conveying equipment

Abstract

The utility model provides a low-speed protection device applied to conveying equipment, and belongs to the technical field of mechanical transmission. The technical problem to be solved is to provide a low-speed protection device which can effectively avoid accidents when conveying equipment stops running due to faults. According to the technical scheme, the device comprises an output roller, a plurality of metal sheets are evenly arranged on the output roller, and a speed protection device is arranged at the position adjacent to the output roller; the speed protection device is provided with a normally-closed contact output end, and the normally-closed contact output end is connected into a control loop of the conveying equipment in series. The speed protection device is electrically connected with an alternating current adapter; the alternating current adapter is connected with a power supply; the utility model is applied to the conveying device.

Description

Technical Field

[0001] The utility model provides a low-speed protection device applied to conveying equipment, belonging to the technical field of mechanical transmission. Background Art

[0002] Conveying equipment is increasingly used in machinery manufacturing, motors, chemicals, metallurgy, food processing, daily chemicals and other industries. Transmission equipment generally includes active equipment and driven equipment. When the transmission equipment stops operating due to some reason during the transmission process, if protective measures are not taken in time, the equipment may be damaged and personal safety may be endangered.

[0003] The prior art (Announcement No.: CN 114560258 B) discloses a belt conveyor protection device, which is set up by: connecting multiple emergency stop signals to the pins of chip 1U17 and chip 1U18 in the emergency stop control circuit 2 separately, one emergency stop signal corresponds to one pin, and then transmitting the signal to the signal transfer circuit 4, the signal transfer circuit 4 is also connected to the fault signals corresponding to the sensors such as start and stop, coal stacking, deviation, emergency stop, tearing, dotting, temperature, speed, and smoke, so that the signal transfer circuit 4 connects the emergency stop signal transmitted by the emergency stop control circuit 2 and the fault signal transmitted by the sensor to the main control circuit 5. When there is a signal action, the main control circuit sends the fault signal to the chip U16, and the chip U16 drives the shutdown protection unit of the belt conveyor, thereby realizing the shutdown locking of the belt conveyor; its circuit is complex, the economic cost is high, and accidents may occur after the equipment is stopped urgently. Utility Model Content

[0004] In order to solve the technical problem of accidents caused by the stopping of the conveying equipment due to some reasons, the utility model proposes a low-speed protection device which can effectively avoid accidents caused by the stopping of the conveying equipment due to a fault, and aims to realize the low-speed protection by improving the connection of the circuit of the transmission equipment.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a low-speed protection device applied to a conveying device, comprising an output roller, on which a plurality of metal sheets are evenly arranged, and a speed protection device is arranged at a position adjacent to the output roller; the speed protection device is provided with a normally closed contact output terminal, and the normally closed contact output terminal is serially connected to the control circuit of the conveying device;

[0006] The speed protection device is electrically connected to an AC adapter, and the AC adapter is connected to a power source.

[0007] The speed protection device includes a proximity switch, which is connected to one end of a resistor R0 and pin 3 of a chip IC1. The other end of the resistor R0 is connected in series with an LED lamp and then connected to the positive electrode of an AC adapter. Pin 3 of the chip IC1 is electrically connected to pin 6 of the chip IC1. Pin 2 of the chip IC1 is connected to one end of the resistor R1, one end of the resistor R2 and the chip IC1. The 5th pin of the chip IC1, the other end of the resistor R1 is connected to the positive terminal of the AC adapter, the other end of the resistor R2 is grounded, the 4th pin of the chip IC1 is grounded, the 8th pin of the chip IC1 is electrically connected to the positive terminal of the AC adapter, the 1st pin of the chip IC1 is electrically connected to the base of the transistor T1, the emitter of the transistor T1 is grounded, the collector of the transistor T1 is connected in parallel to the input terminal of the diode D1, the positive terminal of the capacitor C1 and one end of the resistor R3, the output terminal of the diode D1 is connected in parallel to the output terminal of the diode D2, the 3rd pin of the chip IC2 and one end of the resistor R7, the other end of the resistor R7 is electrically connected to the emitter of the transistor T2, the emitter of the transistor T2 is also connected in parallel to the negative terminal of the capacitor C1 and the negative terminal of the capacitor C2, the positive terminal of the capacitor C2 is connected in parallel to the input terminal of the diode D2, the collector of the transistor T2 and one end of the resistor R4, the other end of the resistor R4 is connected to the positive terminal of the AC adapter (5), the emitter of the transistor T2 is grounded, the transistor T2 The base is electrically connected to pin 7 of chip IC1; pin 2 of chip IC2 is connected in parallel with one end of resistor R5 and one end of resistor R6, the other end of resistor R5 is connected to the positive pole of the AC adapter, the other end of resistor R6 is grounded, pin 1 of chip IC2 is connected in series with resistor R8 and then electrically connected to the base of transistor T3, the emitter of transistor T3 is grounded, the collector of transistor T3 is connected in parallel with the coil of relay K, diode D3, capacitor C3 and resistor R9 and then connected to the positive pole of the AC adapter, pin 4 of chip IC2 is grounded, and pin 8 of chip IC2 is connected to the positive pole of the AC adapter.

[0008] Furthermore, the normally closed contact output terminal includes a normally closed contact of the relay K, and the normally closed contact of the relay K is connected in parallel with a branch circuit, and the branch circuit is serially connected with a resistor R10 and a capacitor C4.

[0009] Furthermore, the operating voltage of the proximity switch is 6V to 36V.

[0010] Furthermore, the operating voltage of the speed protection device is 12V.

[0011] Furthermore, the chip IC1 and the chip IC2 are of the LM358 type.

[0012] Furthermore, the model of the transistor T1 and the transistor T2 is 9012.

[0013] Furthermore, the model of the transistor T3 is 9014.

[0014] Furthermore, the diode D1, the diode D2 and the diode D3 are of type IN4007.

[0015] Furthermore, the model of the relay K is G2R-1-DC12V.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. The speed protection device provided by the utility model is composed of a logic circuit, a wide range DC voltage proximity switch and auxiliary components. The normally closed contact output end of the relay is connected in series in the control circuit of the relevant output device. When the conveying equipment stops running due to a fault, the capacitor C1 or the capacitor C2 in the control circuit is charged, and the transistor T3 is turned on, so that the coil of the relay K is energized, triggering the normally closed contact of the relay to disconnect, thereby delaying the stop of the conveying equipment, solving the problem of equipment accidents caused by the slipping of the driven device and the shutdown due to a fault, effectively avoiding damage to the equipment and ensuring personal safety;

[0018] 2. The control circuit of the utility model is composed of common electronic components and is very economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings:

[0020] Figure 1 This is the circuit diagram of the speed control device of the utility model;

[0021] Figure 2 The output roller of the utility model;

[0022] Figure 3 It is a schematic diagram of the circuit structure of the utility model;

[0023] In the figure: 1 is the output roller, 2 is the proximity switch, 3 is the speed protection device, 4 is the normally closed contact output terminal, and 5 is the AC adapter. DETAILED DESCRIPTION

[0024] like Figures 1 to 3As shown, the utility model provides a low-speed protection device for conveying equipment, including an output roller 1, which is a component of a driven device of the conveying equipment. A plurality of metal sheets are evenly arranged on the circumference of the output roller 1 according to specific working conditions. The arrangement position of the metal sheets can be changed accordingly with the change of the movement mode of the driven device. The metal sheets can also be replaced by other forms of metal. As the output roller 1 rotates, the metal sheets also rotate. A speed protection device 3 is arranged at a position adjacent to the output roller 1. The speed protection device 3 is provided with a normally closed contact output terminal 4. The normally closed contact output terminal 4 includes a normally closed contact of a relay K. A normally closed contact of the relay K is connected to a branch circuit, and a resistor R10 and a capacitor C4 are connected in series on the branch circuit. The normally closed contact output terminal 4 is connected in series to the control circuit of the conveying equipment; the speed protection device 3 is electrically connected to an AC adapter 5, the output voltage of the AC adapter 5 is 12V, and the AC adapter 5 is connected to a 220V power supply.

[0025] The speed protection device 3 includes a proximity switch 2, and a wide range DC voltage proximity switch 2 is selected, such as an operating voltage between 6V and 36V. The proximity switch 2 is connected in parallel to one end of the resistor R0 and the 3rd pin of the chip IC1, and the other end of the resistor R0 is connected in series with the circuit indicator LED light and then connected to the positive electrode of the AC adapter 5. The 2nd pin of the chip IC1 is connected in parallel to one end of the adjustable resistor R1 and one end of the resistor R2, and the other end of the resistor R1 is connected to the positive electrode of the AC adapter 5. The other end of the resistor R2 is grounded, and the 2nd pin of the chip IC1 is electrically connected to the chip IC1. Pin 5 of chip IC1, pin 3 of chip IC1 is electrically connected to pin 6 of chip IC1, pin 4 of chip IC1 is grounded, pin 8 of chip IC1 is electrically connected to the positive electrode of AC adapter 5, pin 1 of chip IC1 is electrically connected to the base of transistor T1, the emitter of transistor T1 is grounded, the collector of transistor T1 is connected in parallel to the input end of diode D1, the positive electrode of capacitor C1 and one end of resistor R3, the output end of diode D1 is connected in parallel to the output end of diode D2, pin 3 of chip IC2 and one end of resistor R7, the other end of resistor R7 is electrically connected to the emitter of transistor T2, the emitter of transistor T2 is also connected in parallel to the negative electrode of capacitor C1 and the negative electrode of capacitor C2, the positive electrode of capacitor C2 is connected in parallel to the input end of diode D2, the collector of transistor T2 and one end of resistor R4, the other end of resistor R4 is connected to the positive electrode of AC adapter 5, the emitter of transistor T2 is grounded, transistor T2 The base is electrically connected to pin 7 of chip IC1; pin 2 of chip IC2 is connected in parallel to one end of resistor R5 and one end of resistor R6, the other end of resistor R5 is connected to the positive electrode of AC adapter 5, and the other end of resistor R6 is grounded; pin 1 of chip IC2 is connected in series with resistor R8 and then electrically connected to the base of transistor T3, the emitter of transistor T3 is grounded, the collector of transistor T3 is connected in parallel to the coil of relay K, diode D3, capacitor C3 and resistor R9 and then connected to the positive electrode of AC adapter 5, pin 4 of chip IC2 is grounded, and pin 8 of chip IC2 is connected to the positive electrode of AC adapter 5; a normally closed contact of relay K is connected in series in the control loop of the conveying equipment, and a branch connected in parallel with a normally closed contact of relay K is connected in series with resistor R10 and capacitor C4.

[0026] The working voltage of the speed protection device 3 is 12V;

[0027] The models of chip IC1 and chip IC2 are LM358;

[0028] The model of transistor T1 and transistor T2 is 9012;

[0029] The model of transistor T3 is 9014;

[0030] The diodes D1, D2 and D3 are of the type IN4007;

[0031] The model of relay K is G2R-1-DC12V.

[0032] When using the utility model, first adjust the resistor R0 so that when the metal sheet approaches the proximity switch 2, the voltage of the 3rd pin of the chip IC1 is 7V, and when the metal sheet is away from the proximity switch 2, the voltage of the 3rd pin of the chip IC1 is 10V, so that when the metal sheet approaches or moves away from the proximity switch 2, the working voltage of the 3rd pin of the chip IC is kept within the working range of the proximity switch 2; adjust the resistors R1 and R5 so that the voltage of the 2nd pin of the chip IC1 and the 2nd pin of the chip IC2 is constant at 8.5V; adjust the resistors R3 and R4 to adjust the delay time of the speed protection device 3 to stop the relevant conveying equipment according to the working conditions;

[0033] After the speed protection device 3 has debugged the circuit according to the working conditions of the conveying equipment, when the power is just turned on, since the capacitors C1 and C2 have charging and discharging performances, and the resistors R3 and R4 are preset with certain resistance values, the capacitors C1 and C2 cannot quickly reach a high level. At this time, the OR gate circuit composed of the diode D1, the diode D2 and the resistor R7 outputs a low level, that is, the input of the 3rd pin of the chip IC2 is a low level. Since the 2nd pin of the chip IC2 is preset to a high level (8.5V), the 1st pin of the chip IC2 outputs a low level. At this time, the transistor T3 is cut off, the collector of the transistor T3 is a high level, the coil of the relay K is not energized, the normally closed contact of the relay K does not operate, and the conveying equipment operates normally.

[0034] When the conveying equipment is operating normally, the metal sheet approaches and moves away from the proximity switch 2 at intervals, so that the operating voltage of the chip IC1's pin 3 varies between 7 and 10V. Since the chip IC1's pin 2 is preset to a high level (8.5V), the chip IC1's pin 2 is connected to the chip IC1's pin 5, and the chip IC1's pin 3 is connected to the chip IC1's pin 6. The output levels of the chip IC1's pins 1 and 7 alternate between high and low levels, that is, when the chip IC1's pin 1 outputs a high level, the chip IC1's pin 7 outputs a low level, and when the chip IC1's pin 1 outputs a low level, the chip IC1's pin 7 outputs a high level. This alternating change causes the transistors T1 and T2 to be alternately turned on. Therefore, the capacitors C1 and C2 continue to maintain a low level, and the OR gate composed of the diodes D1, D2 and the resistor R7 outputs a low level, and the conveying equipment operates normally.

[0035] When the driven device of the conveying equipment stops running due to some fault, there are two situations of the position relationship between the metal sheet and the proximity switch 2, one is that the metal sheet is away from the proximity switch 2, and the other is that the metal sheet is close to the proximity switch 2; when the metal sheet is away from the proximity switch 2, the 3rd pin of the chip IC1 inputs a high level (10V), the 1st pin of the chip IC1 outputs a high level, and the 7th pin of the chip IC1 outputs a low level, therefore, the transistor T1 is turned off, the transistor T2 is turned on, the capacitor C1 is delayed to charge, and the capacitor C2 continues to maintain a low level. When the capacitor C1 When the charging time t1=R3*C1, the capacitor C1 changes to a high level. At this time, the diode D1 is turned on, and the OR gate circuit composed of the diode D1, the diode D2 and the resistor R7 outputs a high level, that is, the 3-pin input of the chip IC2 is a high level (close to the power supply voltage 12V), and the 1-pin of the chip IC2 outputs a high level, that is, the base input of the transistor T3 is a high level, the transistor T3 is turned on, and the collector of the transistor T3 is a low level. The coil of the relay K is energized, and the normally closed contact of the relay K is actuated, and the conveying equipment is delayed to stop. The delay time is determined by the power supply. The charging time t1 of capacitor C1 is determined by the delay time set by t1, and the delay time set by t1 is determined according to the working conditions of the on-site transportation equipment; when the metal sheet approaches the proximity switch 2, the input of pin 3 of chip IC1 is low level (7V), the output of pin 1 of chip IC1 is low level, and the output of pin 7 of chip IC1 is high level. Therefore, transistor T1 is turned on, transistor T2 is turned off, capacitor C2 is delayed to charge, and capacitor C1 continues to maintain a low level. When the charging time t2 of capacitor C2 = R4*C2, capacitor C2 becomes a high level. At this time, diode D2 is turned on, and the diode D2 is turned on. The OR gate circuit composed of transistor D1, diode D2 and resistor R7 outputs a high level, that is, the input of pin 3 of chip IC2 is a high level (close to the power supply voltage 12V), and pin 1 of chip IC2 outputs a high level, that is, the base input of transistor T3 is a high level, transistor T3 is turned on, the collector of transistor T3 is a low level, the coil of relay K is energized, the normally closed contact of relay K is actuated, and the conveying equipment stops with a delay. The delay time is determined by the charging time t2 of capacitor C2, and the delay time set by t2 is determined according to the working conditions of the on-site transportation equipment.

[0036] The working principle of the utility model is:

[0037] The utility model installs uniformly spaced metal sheets on the output roller 1 of the driven device, and connects the normally closed contact output terminal 4 of the relay in series in the control circuit of the relevant conveying equipment. When the transmission equipment operates normally, the metal sheet rotates at a uniform speed, and the distance between the metal sheet and the proximity switch 2 is an inductive relationship of a reciprocating cycle of being away and approaching. At this time, the utility model does not work; when the transmission equipment is in an emergency, that is, when the driven device of the transmission equipment stops rotating, the position relationship between the metal sheet and the proximity switch 2 has two states: one is that the metal sheet is close to the proximity switch 2, and the other is that the metal sheet is away from the proximity switch 2. At this time, no matter which state is, the utility model can be operated after a period of delay, so that the normally closed contact in series in the electrical secondary circuit of the utility model is disconnected, and the main transmission equipment is stopped, thereby effectively avoiding the occurrence of accidents.

[0038] Regarding the specific structure of the utility model, it should be explained that the connection relationship between the various component modules adopted in the utility model is definite and feasible. Except for special instructions in the embodiments, the specific connection relationship can bring corresponding technical effects and solve the technical problems raised by the utility model without relying on the execution of corresponding software programs. The components, modules, models of specific components and the connection methods between each other appearing in the utility model, as well as the conventional use methods and expected technical effects brought about by the above-mentioned technical features, except for specific instructions, all belong to the disclosed contents in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by technical personnel in this field before the application date, or belong to the existing technologies such as conventional technologies and common knowledge in this field, and there is no need to elaborate, so that the technical solution provided in this case is clear, complete and feasible, and the corresponding physical products can be reproduced or obtained according to the technical means.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A low-speed protection device for conveying equipment, characterized in that: It comprises an output roller (1), a plurality of metal sheets are evenly arranged on the output roller (1), and a speed protection device (3) is arranged at a position adjacent to the output roller (1); the speed protection device (3) is provided with a normally closed contact output terminal (4), and the normally closed contact output terminal (4) is connected in series to a control circuit of a conveying device; The speed protection device (3) is electrically connected to an AC adapter (5), and the AC adapter (5) is connected to a power source; The speed protection device (3) comprises a proximity switch (2), wherein the proximity switch (2) is connected to one end of a resistor R0 and pin 3 of a chip IC1, the other end of the resistor R0 is connected in series with an LED light and then connected to the positive electrode of an AC adapter (5), pin 3 of the chip IC1 is electrically connected to pin 6 of the chip IC1, and pin 2 of the chip IC1 is connected to one end of the resistor R1, one end of the resistor R2 and the chip IC1 The 5th pin of the chip IC1, the other end of the resistor R1 is connected to the positive pole of the AC adapter (5), the other end of the resistor R2 is grounded, the 4th pin of the chip IC1 is grounded, the 8th pin of the chip IC1 is electrically connected to the positive pole of the AC adapter (5), the 1st pin of the chip IC1 is electrically connected to the base of the transistor T1, the emitter of the transistor T1 is grounded, the collector of the transistor T1 is connected in parallel to the input end of the diode D1, the positive pole of the capacitor C1 and one end of the resistor R3, the output end of the diode D1 is connected in parallel to the output end of the diode D2, the 3rd pin of the chip IC2 and one end of the resistor R7, the other end of the resistor R7 is electrically connected to the emitter of the transistor T2, the emitter of the transistor T2 is also connected in parallel to the negative pole of the capacitor C1 and the negative pole of the capacitor C2, the positive pole of the capacitor C2 is connected in parallel to the input end of the diode D2, the collector of the transistor T2 and one end of the resistor R4, the other end of the resistor R4 is connected to the positive pole of the AC adapter (5), the emitter of the transistor T2 is grounded, the transistor T2 The base is electrically connected to pin 7 of chip IC1; pin 2 of chip IC2 is connected in parallel to one end of resistor R5 and one end of resistor R6, the other end of resistor R5 is connected to the positive electrode of the AC adapter (5), the other end of resistor R6 is grounded, pin 1 of chip IC2 is connected in series with resistor R8 and then electrically connected to the base of transistor T3, the emitter of transistor T3 is grounded, the collector of transistor T3 is connected in parallel to the coil of relay K, diode D3, capacitor C3 and resistor R9 and then connected to the positive electrode of the AC adapter (5), pin 4 of chip IC2 is grounded, and pin 8 of chip IC2 is connected to the positive electrode of the AC adapter (5).

2. A low-speed protection device for conveying equipment according to claim 1, characterized in that: The normally closed contact output terminal (4) comprises a normally closed contact of the relay K, and the normally closed contact of the relay K is connected in parallel with a branch circuit, and a resistor R10 and a capacitor C4 are connected in series on the branch circuit.

3. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The operating voltage of the proximity switch (2) is 6V to 36V.

4. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The operating voltage of the speed protection device (3) is 12V.

5. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The chip IC1 and the chip IC2 are of the LM358 type.

6. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The model of the transistor T1 and the transistor T2 is 9012.

7. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The model of the transistor T3 is 9014.

8. The low-speed protection device for conveying equipment according to claim 1 is characterized in that: The diode D1 , the diode D2 and the diode D3 are of type IN4007.

9. The low-speed protection device for conveying equipment according to claim 1, characterized in that: The model of the relay K is G2R-1-DC12V.

Images