Electric elevator with protection function
By introducing wireless remote control and real-time monitoring functions into the electric hoist, the safety hazards of hook slippage and motor overheating in the electric hoist have been solved, realizing remote control and automatic protection, and improving the safety and reliability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FASHIDA (SHANGHAI) MASCH EQUIP CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-07-14
AI Technical Summary
Existing electric hoists require close-range operation by staff, pose significant safety hazards when the hook and motor overheat, and lack remote control and real-time monitoring capabilities.
By introducing a wireless remote control mechanism, temperature probe, hook detection probe, and electromagnetic braking mechanism into the electric hoist, remote control of the hook operation can be achieved. The motor power and brake will be automatically shut off when the hook or motor overheats, and the sound and light alarms will alert the staff.
It enables remote control of the hook operation, reducing the risk of motor damage and worker injury, and improving safety and reliability.
Smart Images
Figure CN224493582U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hoisting equipment technology, and in particular to an electric hoist with protective functions. Background Technology
[0002] In construction sites and equipment maintenance and installation sites (such as sites for wind power installation and maintenance), traditional electric winches (electric hoists) are generally used to lift goods. The main structure of an electric hoist includes a motor, reduction gears, wire rope, hook, and other components. During operation, the hook is suspended at a high position. The operator controls the motor shaft to rotate clockwise or counterclockwise by pressing different buttons on the control handle. This reduces the torque of the motor's output power through the reduction gears, causing the hook at the lower end of the wire rope to rise or fall. (The wire rope is wound in the groove behind the large reduction gear. When the large reduction gear rotates counterclockwise, the left end of the wire rope falls and the right end lifts the hook and the goods. When the large reduction gear rotates clockwise, the left end of the wire rope rises and the right end lowers the hook and the goods.) This hoists the goods to a high position or lowers them to a low position.
[0003] With the development of industrial technology, electric hoist technology has also made some progress. For example, the authorized patent in my country, patent number "201820204015.3" entitled "Inverted Circulating Electric Hoist," states that "the inverted circulating electric hoist of this utility model has a simple structure and is easy to use. The alternating use of double wall-mounted lifting points can effectively improve work efficiency and has good practicality." However, as can be seen, although this patent achieves its inventive purpose, it is limited by its structure and function, and like other hoists in this field, it still has the following problems. First, workers can only approach the equipment to manually operate the relevant buttons. Due to being too close to the hoisted goods, in extreme cases, if the hook slips or the wire rope breaks, there is a chance of personal injury to the workers below the electric hoist. Second, it lacks hook slippage and motor overheat monitoring functions. When the hook slips due to various reasons (such as motor damage or excessive weight of the hoisted goods) or the motor temperature exceeds the standard (such as excessive motor load), there is a chance of the goods falling too fast, the goods hitting the ground and being damaged, and the motor being damaged. Therefore, it is very necessary to provide an electric hoist that can be wirelessly controlled from a long distance and can monitor in real time whether there is hook slippage or motor overheating. Utility Model Content
[0004] To overcome the shortcomings of existing electric hoists due to structural limitations, as described in the background art, this utility model provides an electric hoist with protective functions. Based on the electric hoist body, under the joint action of related mechanisms, workers can wirelessly control the hook to lift or lower. In the event of hook slippage or motor overheating, the power to the motor can be shut off immediately and the motor shaft can be braked. This provides convenience for workers, reduces the probability of motor damage, and minimizes the chance of accidental injury to workers.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] An electric hoist with protective functions includes an electric hoist body, a wireless remote control mechanism, and a temperature probe. The motor of the electric hoist body has an electromagnetic braking mechanism, as well as a wireless receiving circuit, a hook detection probe, a warning circuit, and a control circuit. The hook detection probe includes a DC generator and a fixed base. A pulley is fixedly installed on the front end of the DC generator shaft, and the housing of the DC generator is fixedly installed on the side end of the fixed base. The rear end of the fixed base is fixedly installed inside the rear end of the outer shell of the electric hoist body. The temperature probe is fixedly installed on the outside of the motor housing of the electric hoist body. The wireless remote control mechanism, wireless receiving circuit, and control circuit are installed inside an electrical control box. The signal output terminal of the control circuit is electrically connected to the signal input terminal of the wireless remote control mechanism; the power output terminal of the control circuit is electrically connected to the power input terminal of the electric hoist body; the signal output terminal of the wireless receiving circuit is electrically connected to the first signal input terminal of the control circuit; and the control terminal of the wireless receiving circuit is electrically connected to the signal input terminal of the electric hoist body. The two terminals of the temperature probe, the two terminals of the DC generator, and the second signal input terminal of the control circuit are electrically connected respectively. The prompting circuit includes a battery, a receiving sub-circuit, and a wireless remote control device installed in the component box, with the two poles of the battery electrically connected to the power input terminal of the receiving sub-circuit.
[0007] Furthermore, the grooved end of the pulley and the outer end of the lifting wire rope of the electric hoist body are in rotatable contact.
[0008] Furthermore, the sensing surface of the temperature probe is in close contact with the outer side of the motor housing.
[0009] Furthermore, the wireless receiving circuit includes a wireless receiving circuit module and a relay that are electrically connected. Three power output terminals of the wireless receiving circuit module are respectively connected to the positive power input terminals of the three relays, two of the relays are connected to the control power input terminals, and the negative power input terminal of the wireless receiving circuit module is connected to the negative power input terminals of the three relays.
[0010] Furthermore, the control circuit includes diodes, resistors, thyristors, and relays connected via circuit board wiring. The positive power input terminals of two relays are connected to the normally open contact terminal of the third relay. The control power input terminal of the third relay is connected to the anode of the thyristor. One end of the first resistor, one end of the second resistor, one end of the third resistor, and one end of the fourth resistor are connected. The other end of the third resistor is connected to the control electrode of the thyristor. The cathode of the thyristor is connected to the positive power input terminal of the third relay. The other end of the second resistor is connected to the negative power input terminals of the third relay, the first relay, and the second relay.
[0011] Furthermore, the receiving sub-circuit of the prompting circuit includes an audible and visual alarm and a wireless receiving circuit module A that are electrically connected. One of the power output terminals of the wireless receiving circuit module A is connected to the positive power input terminal of the audible and visual alarm, and the negative power input terminal of the audible and visual alarm is connected to the negative power input terminal of the wireless receiving circuit module A.
[0012] Furthermore, the encoding of the wireless remote control mechanism is consistent with the encoding of the wireless receiving circuit module A, and the encoding of the wireless remote control device is consistent with the encoding of the wireless receiving circuit module.
[0013] Compared with existing technologies, the advantages of this utility model are as follows: Based on the electric hoist body, in application, workers can wirelessly control the hook to lift or lower via wireless remote control equipment, wireless receiving circuit, and control circuit. Furthermore, in the event of hook slippage or motor overheating, the power supply to the electric hoist body's motor can be shut off immediately, and the motor shaft can be braked. The reason for the motor stoppage can also be wirelessly communicated to the workers, thus providing convenience, reducing the probability of motor damage, and minimizing accidental injury to workers. In summary, this utility model has good application prospects. Attached Figure Description
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0016] Figure 2 This is a partial structural schematic diagram of the present invention.
[0017] Figure 3 , 4 This is the circuit diagram of this utility model. Detailed Implementation
[0018] Figure 1 , 2As shown in Figures 3 and 4, the electric hoist with protective functions includes an electric hoist body 1, a power module A1, a wireless remote control mechanism W4, and a temperature probe K. The motor M of the electric hoist body 1 has an electromagnetic braking mechanism DC (no braking when energized, braking when de-energized), and also has a wireless receiving circuit 2, a hook detection probe, a warning circuit, and a control circuit 5. The hook detection probe includes a DC generator F and a fixed base 31. A pulley 32 is fixedly installed on the front end of the shaft of the DC generator F. The housing of the DC generator F is fixedly installed on the left side of the fixed base 31, and the rear end of the fixed base 31 is fixedly installed on the right middle of the rear end of the outer shell of the electric hoist body 1. The temperature probe K is fixedly installed on the outer side of the upper end of the motor housing of the electric hoist body 1. The power module A1, the wireless remote control mechanism W4, the wireless receiving circuit 2, and the control circuit 5 are installed in the electrical control box of the electric hoist body 1. The warning circuit includes a battery G1 installed in the component box 6, a charging socket CZ, a receiving sub-circuit 4, a power switch S1, and a wireless remote control device W3, which is carried by the operator during work.
[0019] Figure 1 , 2As shown in Figures 3 and 4, the left end of the groove of pulley 32 and the right outer end of the lifting wire rope 101 of the electric hoist body are in rotatable contact. The sensing surface of temperature probe K is in close contact with the outer side of the upper end of the motor housing. The wireless receiving circuit includes a wireless receiving circuit module W2 and relays J1, J2, and J3 connected via circuit board wiring. Three power output terminals 3, 4, and 5 of the wireless receiving circuit module W2 are connected to the positive power input terminals of the three relays J1, J2, and J3, respectively. Two relays J1 and J2 are connected to the control power input terminals. The negative power input terminal 2 of the wireless receiving circuit module W2 is connected to the negative power input terminals of the three relays J1, J2, and J3, respectively. The control circuit includes resistors R1, R2, R3, R4, a silicon controlled rectifier (SCR) VS, relays J5, J6, J7, and a diode VL connected via circuit board wiring. The positive power input terminals of two relays, J6 and J7, are connected to the normally open contact of the third relay, J5. The control power input terminal of the third relay, J5, is connected to the anode of the SCR VS. One end of the first resistor R1, one end of the second resistor R2, one end of the third resistor R3, and one end of the fourth resistor R4 are connected. The other end of the third resistor R3 is connected to the control electrode of the SCR VS, and the cathode of the SCR VS is connected to the positive power input terminal of the third relay J5. The other end of the second resistor R2 is connected to the negative power input terminals of the third relay J5, the first relay J6, and the second relay J7. One end of the first resistor R1 is connected to the negative terminal of the diode VL. The receiving sub-circuit of the alert circuit includes an audible and visual alarm B1 and a wireless receiving circuit module AW5 connected via circuit board wiring. One power output pin 3 of the wireless receiving circuit module AW5 is connected to the positive power input pin of the audible and visual alarm B1, and the negative power input pin 2 of the audible and visual alarm B1 is connected to the negative power input pin 2 of the wireless receiving circuit module AW5. The encoding of the wireless remote control mechanism W4 encoding circuit is consistent with the encoding of the wireless receiving circuit module AW5 encoding circuit, and the encoding of the wireless remote control device W3 encoding circuit is consistent with the encoding of the wireless receiving circuit module W2 encoding circuit. The encoding of the wireless remote control mechanism W4 encoding circuit is inconsistent with the encoding of the wireless remote control device W3 encoding circuit.
[0020] Figure 1 , 2As shown in Figures 3 and 4, the power input terminals 1 and 2 of the power module W1 are connected in series via power switch S1 to the 220V AC power line on the electric hoist body via wires. The power input terminals of relays J7 and J3 are connected to one pole of the 220V AC power supply via wires; the normally closed contact of relay J7 is connected to one DC power input terminal of the electromagnetic brake mechanism of the electric hoist body, the main power input terminal of the motor M of the electric hoist body, and the normally open contact of relay J3 via wires; the normally open contacts of relays J1 and J2 are connected to the two poles of the running capacitor C of the motor M via wires; one terminal of temperature switch K is connected to the positive power input terminal 1 of the wireless receiver circuit module W2, the positive power output terminal 3 of the power module W1, and the wireless remote control mechanism W4. The positive power input terminal is connected via a wire to the other end of temperature switch K and resistor R4; the other terminal of the 220V AC power supply is connected via a wire to the control power input terminals of relays J1 and J2 and the other end of the DC power input terminal of the electromagnetic brake mechanism; the negative power output terminal (pin 4) of power module W1 is connected via a wire to relays J1, J2, J3, J5, J6, and J7, the other end of resistor R2, and the negative power input terminal (pin 2) of wireless remote control mechanism W4; the control contact terminal and normally open contact terminal of relay J6 are connected via a wire to the two contacts of the first transmitting button D1 of wireless remote control mechanism W4. The two terminals of battery G1 are connected via a wire to the two ends of charging socket CZ (when battery G1 is depleted, the 12V power charger plug is inserted into charging socket CZ to charge the battery), and connected via a wire to the power input terminals (pins 1 and 2) of the wireless receiving circuit module AW5 of the receiving sub-circuit, which is connected in series with power switch S2. The power output terminal of generator F is connected via a wire to the positive terminal of diode V1 and the other end of resistor R2. The display surface of the audible and visual alarm B1, the socket of the charging socket CZ, and the handle of the power switch S2 are located outside the two openings at the front of the component box 6.
[0021] Figure 1 , 2As shown in Figures 3 and 4, this new invention is based on the electric hoist body 1. During operation, the hook 102 is hooked at a high position. The operator controls the rotating shaft of the motor M to rotate clockwise or counterclockwise. This causes the reduction gear to reduce the power output of the motor and increase the torque, which in turn drives the hook 104 at the lower end of the wire rope 101 to rise or fall in height (the wire rope 101 is wrapped in the groove on the rear side of the large reduction gear 103. When the large reduction gear 103 rotates counterclockwise, the left end of the wire rope 101 falls in height, and the right end drives the hook 104 and the goods to rise in height. When the large reduction gear 103 rotates clockwise, the left end of the wire rope 101 rises in height, and the right end drives the hook 104 and the goods to fall in height), thus hoisting the goods to a high position or placing them at a low position. The above is a mature existing technology, so this application will not elaborate on its working principle and specific workflow. After the AC 220V power supply enters the power input terminal of the power module W1, the power module W1 outputs a stable DC 12V power supply through pins 3 and 4, which enters the power input terminal of the wireless remote control mechanism, wireless receiving circuit, and control circuit. After the power switch S2 is turned on, the wireless receiving circuit module AW5 is powered on and starts working. When it is necessary to control the lifting or lowering height of the hook of the electric hoist body 1, the operator presses the first wireless transmission button D1 or the second wireless transmission button D2 of the wireless remote control device W3. The wireless remote control device W3 transmits the first or second wireless closed signal. After receiving the signal, the wireless receiving circuit module W2 outputs a high level from pin 3 or 4, which enters the positive power input terminal of relay J1 or J2. The relay J1 or J2 is energized and its control power input terminal and normally open contact terminal are closed. In this way, one end or the other end of the running capacitor C of the motor is energized. After one end of the running capacitor C is energized, the shaft of the motor M rotates clockwise. Then, under the joint action of the relevant mechanisms of the electric hoist body 1, the hook 104 will lift the hoisted goods to a higher height. After the other end of the running capacitor C is energized, the shaft of the motor M rotates counterclockwise. Then, under the joint action of the relevant mechanisms of the electric hoist body 1, the hook 102 will lower the hoisted goods to a lower height. When the operator presses the first wireless transmitter button D1 or the second wireless transmitter button D2 of the wireless remote control device W3 again, the wireless remote control device W3 will transmit the first or second wireless open-circuit signal. After receiving the signal, the wireless receiver circuit module W2 will stop outputting a high level to the positive power input terminal of the relay J1 or J2. The relay J1 or J2 will be de-energized and will no longer be energized. Its control power input terminal and normally open contact terminal will be open. In this way, one end of the motor's running capacitor C will be de-energized, the shaft of the motor M will no longer rotate, and the hook 104 of the electric hoist body 1 will be at the corresponding height.
[0022] Figure 1 , 2As shown in Figures 3 and 4, when the hook 104 of this novel type descends, the lifting wire rope 101 will drive the pulley 32 to rotate counterclockwise. The pulley 32 will drive the shaft of the generator F to rotate counterclockwise. The positive and negative power outputs of the generator F are unidirectionally conducted through diode V1 into resistors R1 and R2. (When the lifting wire rope 101 drives the hook upward, the lifting wire rope 101 will drive the pulley 32 to rotate clockwise. The generator F outputs positive and negative power. Due to the reverse cutoff effect of diode V1, the positive and negative power outputs of the generator F cannot enter resistor R1, and the subsequent relay J5 will not be energized and engaged.) When the hook descends at a suitable normal speed... The power output from generator F is divided by resistors R1 and R2, and then reduced by resistor R3 to limit the current. When the voltage is below 0.7V at the control electrode of the thyristor VS, relay J5 will not be energized and will operate normally. When the hook descends too quickly, the power output from generator F is divided by resistors R1 and R2, and then reduced by resistor R3 to limit the current. When the voltage is above 0.7V at the control electrode of the thyristor VS, it conducts, and the cathode outputs a high level to the negative power input terminal of relay J5. Relay J5 will then be energized and its control power input terminal and normally open contact terminal will close. Subsequently, relays J6 and J7 will be energized and energized. When motor M is powered on and its casing temperature is below a certain level (e.g., below 40°C), the internal contacts of temperature probe K are open, so relay J5 will not be energized and motor M will continue to operate normally. When motor M malfunctions and its casing temperature is above a certain level (e.g., above 40°C), the internal contacts of temperature probe K close. In this case, the power output from pins 3 and 4 of power module W1 is divided by resistors R1 and R2, and then reduced and current-limited by resistor R3 (above 0.7V) and enters the control electrode of thyristor VS. The voltage is above 0.7V, thyristor VS conducts, and the cathode outputs a high level, which enters the negative power input terminal of relay J5. Relay J5 will be energized and its control power input terminal and normally open contact terminal will close. Subsequently, relays J6 and J7 will be energized and energized (only after power switch S1 is closed will thyristor VS stop conducting, and then relays J5, J6, and J7 will successively lose power and not be energized). If the hook descends too quickly or the motor M overheats, relay J6 will be energized and its control power input terminal and normally open contact terminal will close. This will cause the two contacts of the first transmitting button D1 of the wireless remote control mechanism W4 (connected to the control contact terminal and normally open contact terminal of relay J6 respectively) to close, thus transmitting the first wireless closing signal. The wireless receiving circuit module AW5 near the operator receives this first wireless signal, and its pin 3 outputs a high level, which enters the power input terminal of the audible and visual alarm B1. The alarm B1 then energizes and emits an audible and visual signal, alerting the operator that the motor is overheating or the hook is descending too quickly, prompting timely maintenance.When relay J7 is energized and engaged, its control power input terminal and normally closed contact terminal are open. Since the normally closed contact terminal of relay J7 is connected to the electromagnetic brake mechanism DC of the electric hoist body and one end of the power input of motor M via a wire, the motor will lose power and stop rotating at this moment. The electromagnetic brake mechanism DC will lose power and lock the rotating disk connected to the motor shaft. The motor M shaft will immediately stop rotating, preventing the goods from continuing to descend.
[0023] Figure 1 , 2 As shown in Figures 3 and 4, specifically, when the motor overheats or the hook descends too quickly, in order to lower the suspended goods and hook, the worker presses the third wireless transmitter button D3 on the wireless remote control device W3. The wireless remote control device W3 then transmits a third wireless closed signal. Upon receiving this signal, the wireless receiver circuit module W2 outputs a high-level signal from pin 5, which enters the positive power input terminal of relay J3. Relay J3 is energized and its control power input terminal and normally open contact close. Since the control power input terminal and normally open contact of relay J3 are connected to the control power input terminal and normally closed contact of relay J7 respectively, relay J... 7. The control power input terminal and normally closed contact terminal will be short-circuited, meaning that the main power input terminal of motor M1 and one power input terminal of the electromagnetic brake mechanism DC will be energized (but not braking). This allows the operator to control the electric hoist body 1 for normal lifting operations. Specifically, by manually pressing D1 and D2 at intervals, the hook and cargo are lowered. The operator can then determine whether the electric hoist body 1 stopped working due to motor overheating or hook slippage. If the motor is not hot to the touch, it indicates hook slippage; if the motor is overheated, it may not be a hook slippage problem, allowing for targeted repairs. Through all the above technical solutions, the operator can wirelessly control the hook lifting or lowering, and in the event of hook slippage or motor overheating, the electric hoist body's motor power can be shut off immediately, and the motor shaft brake can be applied. The operator can also be wirelessly notified of the reason for the motor stopping, thus providing convenience, reducing the chance of motor damage, and minimizing the risk of accidental injury to the operator. Figure 4As shown, the resistance values of resistors R1, R2, R3, and R4 are 110KΩ, 7KΩ, 100Ω, and 4.7KΩ respectively; relays J1, J2, J3, J5, J6, and J7 are DC 12V; the SCR VS is MCR100-7; generator F is a small DC 12V generator; and capacitor C is a 12... μF / 400V; Temperature probe K is a KSD301 normally open contact snap-action temperature switch (40℃); Wireless remote control mechanism W4 and wireless receiving circuit module AW5, wireless remote control device W3 and wireless receiving circuit module W2 are four-channel wireless transceiver module components, with a wireless signal transmission and reception distance of 50 meters (completely consistent with the structure and working principle of existing vehicle-mounted wireless transceiver module components, etc., each wireless transceiver module component has its own encoding circuit, and different encoding circuits can prevent mutual interference between different wireless transceiver module components); Power module W1 is an AC 220V to DC 12V switching power supply module; Audible and visual alarm B1 is an FM12V audible and visual alarm; The motor M of the electric hoist body is a 3KW capacitor-run motor.
[0024] Those skilled in the art should understand that although this specification describes embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Therefore, the scope of protection of this application is defined by the claims.
Claims
1. An electric hoist with protective functions, comprising an electric hoist body, a wireless remote control mechanism, and a temperature probe, wherein the motor of the electric hoist body has an electromagnetic braking mechanism, characterized in that, It also includes a wireless receiving circuit, a hook detection probe, a prompting circuit, and a control circuit. The hook detection probe includes a DC generator and a fixed base. A pulley is fixedly installed on the front end of the DC generator's shaft, and the DC generator's housing is fixedly installed on the side end of the fixed base. The rear end of the fixed base is fixedly installed inside the rear end of the electric hoist body's outer shell. The temperature probe is fixedly installed on the outside of the motor housing of the electric hoist body. The wireless remote control mechanism, wireless receiving circuit, and control circuit are installed in the electrical control box. The signal output terminal of the control circuit is electrically connected to the signal input terminal of the wireless remote control mechanism, the power output terminal of the control circuit is electrically connected to the power input terminal of the electric hoist body, the signal output terminal of the wireless receiving circuit is electrically connected to the first signal input terminal of the control circuit, and the control terminal of the wireless receiving circuit is electrically connected to the signal input terminal of the electric hoist body. The two terminals of the temperature probe, the two terminals of the DC generator, and the second signal input terminal of the control circuit are electrically connected respectively. The prompting circuit includes a battery, a receiving sub-circuit, and a wireless remote control device installed in a component box. The two poles of the battery are electrically connected to the power input terminal of the receiving sub-circuit.
2. The electric hoist with protective function according to claim 1, characterized in that, The grooved side of the pulley and the outer end of the lifting wire rope of the electric hoist body make rotational contact.
3. The electric hoist with protective function according to claim 1, characterized in that, The temperature probe's sensing surface is in close contact with the outer side of the motor housing.
4. The electric hoist with protective function according to claim 1, characterized in that, The wireless receiving circuit includes a wireless receiving circuit module and relays that are electrically connected. Three power output terminals of the wireless receiving circuit module are connected to the positive power input terminals of three relays, and two of the relays are connected to the control power input terminals. The negative power input terminal of the wireless receiving circuit module is connected to the negative power input terminals of the three relays.
5. The electric hoist with protective function according to claim 1, characterized in that, The control circuit includes diodes, resistors, thyristors, and relays connected via circuit board wiring. The positive power input terminals of two relays are connected to the normally open contact terminal of the third relay. The control power input terminal of the third relay is connected to the anode of the thyristor. One end of the first resistor, one end of the second resistor, one end of the third resistor, and one end of the fourth resistor are connected. The other end of the third resistor is connected to the control electrode of the thyristor. The cathode of the thyristor is connected to the positive power input terminal of the third relay. The other end of the second resistor is connected to the negative power input terminal of the third relay, the first relay, and the second relay.
6. The electric hoist with protective function according to claim 1, characterized in that, The receiving sub-circuit of the prompt circuit includes an audible and visual alarm and a wireless receiving circuit module A that are electrically connected. One of the power output terminals of the wireless receiving circuit module A is connected to the positive power input terminal of the audible and visual alarm, and the negative power input terminal of the audible and visual alarm is connected to the negative power input terminal of the wireless receiving circuit module A.
7. The electric hoist with protective function according to claim 6, characterized in that, The coding of the wireless remote control mechanism is consistent with the coding of the wireless receiving circuit module A, and the coding of the wireless remote control device is consistent with the coding of the wireless receiving circuit module.