Novel movable cantilever hoisting mechanism

Abstract

A novel movable cantilever hoisting mechanism belongs to the technical field of hoisting equipment and comprises an electric winch, a cantilever, a vehicle body, a lifting hook, a steel wire rope, a pulley, a control box, an electric push rod, a pressure sensor, a fixed arm and a detection circuit, the electric winch, the cantilever, the lifting hook, the steel wire rope, the pulley, the control box, the electric push rod, the pressure sensor, the fixed arm, the detection circuit and the vehicle body are installed together. A worker operates the handle at different angles, equipment can be conveniently pushed to a related operation station, under the action of the two cantilevers and the second electric push rod, the lengths of the two cantilevers can be conveniently adjusted, the third electric push rod can adjust the pitching angles of the cantilevers, a lifting hook and the like, and the range of lifting operation is relatively larger; under the action of the electric winch, the steel wire rope and the like, if the cargo exceeds the hoisting weight threshold value after the hoisted cargo is off the ground, the alarm can remind a worker to stop hoisting operation, equipment overturning is prevented as much as possible, and the safer cargo hoisting effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of hoisting equipment technology, and in particular to a novel mobile cantilever hoisting mechanism. Background Technology

[0002] Mobile cantilever lifting equipment generally includes an electric winch, support frame, extension arm (cantilever), vehicle body, hook, wire rope, etc. In actual operation, workers push the vehicle body to the relevant work position, and the electric winch winds up or unwinds the wire rope, thereby raising or lowering the hook height to achieve the purpose of lifting goods. Due to its advantages of ease of use and low cost, it is widely used in construction or production (such as temporarily lifting items from trucks to the ground in a relevant area).

[0003] With the advancement of industrial technology, mobile cantilever lifting equipment has become increasingly versatile. For example, Chinese patent number "201821350037.7," titled "A Multi-Purpose Mobile Lifting Equipment," describes it as "mobile, reducing labor costs, improving safety, not limited by space, increasing starting height compared to hydraulic forklifts, being electrically driven and environmentally friendly, and using an inclined electric hoist to increase lifting height, enabling stable and precise lifting operations." While this patent achieves its stated technical effects, it suffers from structural and functional limitations, similar to other mobile cantilever lifting equipment in the field, and has the following technical drawbacks. First, its cantilever length is fixed. This means that if the hook is too far from the cargo, it cannot effectively lift the cargo, limiting its application. Second, it lacks tilt monitoring functionality. When lifting excessively heavy loads, workers may not receive warnings, increasing the risk of the equipment tipping forward during lifting and compromising safe operation. Utility Model Content

[0004] In order to overcome the shortcomings of existing mobile cantilever lifting equipment, which are limited by structure and function as described in the background art, this utility model provides a new type of mobile cantilever lifting mechanism that, under the joint action of related mechanisms, can easily adjust the length of the cantilever, has a relatively larger lifting range, and can prompt the staff to stop the lifting operation in real time if the goods exceed the lifting weight threshold after the goods are lifted off the ground, thus preventing the equipment from tipping over as much as possible and achieving a relatively safer goods lifting effect.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A novel mobile cantilever lifting mechanism includes an electric winch, a cantilever, a vehicle body, a hook, a wire rope, pulleys, a control box, electric push rods, a pressure sensor, and a fixed arm, and also has a detection circuit. Support plates are fixedly installed on both sides of the front end of the vehicle body, and wheels are fixedly installed on the lower front ends of the two support plates. An axle is rotatably installed on the rear of the vehicle body, and a crossbar is horizontally fixedly installed at the lower end of the axle. Steering wheels are rotatably installed at both ends of the crossbar. There are multiple electric push rods. The cylinder of the first electric push rod is fixedly installed on one side of the vehicle body, and the movable column of the first electric push rod is located outside the lower end of the vehicle body. The pressure sensor is fixedly installed at the lower end of the movable column of the first electric push rod. The control box is fixedly installed on the front end of the vehicle body. The upper side of the control box has a mounting groove, and the electric winch is fixedly installed inside the lower end of the control box. The upper and lower ends of the fixed arm have an open structure, and the lower end of the fixed arm is fixedly installed in the mounting groove of the control box. The cantilever and pulley are... There are at least two cantilever arms, with open structures at both ends. The upper end of the fixed arm is hinged to the rear end of the first cantilever arm. The rear side of the second cantilever arm is movably fitted inside the front of the first cantilever arm. The cylinder of the second electric push rod is fixedly installed on the upper outer end of the first cantilever arm. The movable column of the second electric push rod is fixedly installed together with the upper outer end of the second cantilever arm. The lower end of the cylinder of the third electric push rod is hinged to the upper outer front of the vehicle body. The upper end of the movable column of the third electric push rod is hinged to the middle of the lower outer end of the first cantilever arm. The two pulleys are rotatably installed inside the rear end of the first cantilever arm and the front end of the second cantilever arm, respectively. One end of the wire rope is fixedly installed on the winding wheel of the electric winch. The other end of the wire rope passes over the upper end of the grooves of the first and second pulleys. The upper end of the hook is fixedly installed together with the other end of the wire rope. The detection circuit is installed in the control box. The signal input terminal of the detection circuit is electrically connected to the signal output terminal of the pressure sensor.

[0007] Furthermore, the outer diameter of the second cantilever is smaller than the inner diameter of the first cantilever.

[0008] Furthermore, the winding wheel and the fixing arm are in the same vertical plane.

[0009] Furthermore, when the movable column of the second electric push rod is at the front stop point, the rear end of the second cantilever is located at the front inner end of the first cantilever.

[0010] Furthermore, an operating handle is fixedly installed on the upper end of the shaft.

[0011] Furthermore, the force-bearing surface of the pressure sensor is located on the lower side.

[0012] Furthermore, the detection circuit includes an electrically connected resistor, a transistor, a relay, and an alarm. The positive power input terminal of the alarm is connected to the normally closed contact terminal of the relay, the positive power input terminal of the relay is connected to the control power input terminal, one end of the first resistor and one end of the second resistor are connected to the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay, and the other end of the second resistor is connected to the emitter of the transistor and the negative power input terminal of the alarm.

[0013] Compared with the prior art, the advantages of this utility model are: (1) The operator can easily push the equipment to the relevant work position by operating the handle at different angles. Under the action of the two cantilever arms and the second electric push rod, the length of the two cantilever arms can be easily adjusted. The third electric push rod can adjust the pitch angle of the cantilever arms and hooks, etc., and the range of hoisting operations is relatively larger; (2) Under the action of the electric winch, wire rope, etc., after the hoisted goods are lifted off the ground, if the goods exceed the hoisting weight threshold, the alarm can prompt the operator to stop the hoisting operation in real time, which can prevent the equipment from overturning as much as possible and achieve a relatively safer hoisting effect. 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 , 3 4 is a schematic diagram of the overall partial structure of this utility model;

[0017] Figure 5 This is the circuit diagram of this utility model. Detailed Implementation

[0018] Figure 1 , 2As shown in Figures 3, 4, and 5, the novel mobile cantilever lifting mechanism includes an electric winch M, cantilever arms 101 and 102, a vehicle body 2, a hook 3, a wire rope 4, a pulley 5, a power module A1, power switches S1, S2, S3, and S4, a control box 6, electric push rods M1, M2, and M3, a pressure sensor A2, and a fixed arm 7; it also has a detection circuit 8; a support plate 21 is fixedly installed on each of the front sides of the vehicle body 2, and a universal wheel 22 (the wheel can rotate 360 ​​degrees) is fixedly installed on the lower front end of each of the two support plates 21; there is an opening in the middle rear of the vehicle body 2, and a bearing 23 is fixedly installed in the opening; a shaft 24 is vertically fixed inside the inner ring of the bearing, and a crossbar 25 is horizontally fixed at the lower end of the shaft 24. A steering wheel 26 is rotatably mounted on each of the left and right ends of the crossbar 25; there are three electric push rods, and there is an opening A in the middle of the vehicle body 2. The cylinder of the first electric push rod M1 is vertically distributed and installed on the middle of the vehicle body 2, and the movable column of the first electric push rod M1 is led out to the lower end of the vehicle body 2 through the opening A (the inner diameter of the opening A is larger than the outer diameter of the movable column). The pressure sensor A2 is fixedly installed on the lower end of the movable column of the first electric push rod M1. The lower end of the control box 6 is fixedly installed on the front end of the vehicle body 2; the upper left side of the control box 6 is an open rectangular structure serving as a mounting slot 61. The electric winch M is fixedly installed on the lower right end of the control box 6, and its winding wheel 9 is located on the left end. The fixed arm 7 is a hollow structure with open structures at both the upper and lower ends. The lower end of the fixed arm 7 is fixedly installed with In the mounting slot 61 on the upper left side of the control box; there are at least two cantilever arms and pulleys, the cantilever arms are hollow structures and their upper and lower ends are open structures; a shaft 71 is fixedly installed on the middle of the upper left and right sides of the fixed arm 7, a bearing 1011 is fixedly installed on the middle of the lower left and right sides of the rear end of the first cantilever arm, the two shafts 71 of the fixed arm are respectively fixedly installed in the inner rings of the bearings 1011 on the lower left and right sides of the first cantilever arm, the rear side of the second cantilever arm 102 is movably fitted inside the front inner side of the first cantilever arm 101, the cylinder of the second electric push rod M2 is fixedly installed in the middle of the upper outer end of the first cantilever arm 101, the movable column of the second electric push rod M2 and the middle of the upper outer end of the second cantilever arm 102 are fixedly installed together; the third electric The lower end of the cylinder of the push rod M3 is hinged to the middle of the upper front of the vehicle body 2. The upper end of the movable column of the third electric push rod M3 is hinged to the middle of the lower outer end of the first cantilever 101. The two pulleys 5 are respectively rotatably installed in the middle of the inner rear end of the first cantilever 101 and the outer front end of the second cantilever 102. One end of the wire rope 4 is fixedly installed on the winding wheel 9 of the electric winch. The other end of the wire rope 4 passes over the upper end of the groove of the first and second pulleys 5, and then leads down from the groove at the front end of the second pulley 5. The upper end of the hook 3 and the other end of the wire rope 4 are fixedly installed together. The power module, power switch and detection circuit are installed in the component box. The component box is installed on the upper right side of the control box 6 and the handles of the four power switches are located on the outer rear upper end of the control box 6.

[0019] Figure 1 , 2 As shown in Figures 3, 4, and 5, the outer diameter of the second cantilever 102 is slightly smaller than the inner diameter of the first cantilever 101. The winding wheel 9 and the fixed arm 7 are in the same vertical plane. When the movable column of the second electric push rod M2 is at the front stop, the rear end of the second cantilever 102 is located at the front inner end of the first cantilever 101. An operating handle 27 is fixedly installed on the upper end of the shaft. The force-bearing surface of the pressure sensor A2 is located on the lower side. The detection circuit includes resistors R1 and R2, transistor T1, relay J1, and alarm B connected via circuit board wiring. The positive power input terminal of alarm B is connected to the normally closed contact terminal of relay J1, and the positive power input terminal of relay J1 is connected to the control power input terminal. One end of the first resistor R1 and one end of the second resistor E2 are connected to the base of transistor T1. The collector of transistor T1 is connected to the negative power input terminal of relay J1. The other end of the second resistor R2 is connected to the emitter of transistor T1 and the negative power input terminal of alarm B. The power input terminals 1 and 2 of power module A1 are connected to the two poles of the 220V AC power supply via wires; the power output terminal of power module A1 and the power input terminals 1 and 2 of the three power switches S4, S2, and S3, the power input terminals 1 and 2 of pressure sensor A2, the power input terminal of the detection circuit, the positive power input terminal of relay J1, and the emitter of transistor T1 are connected via wires; the other end of resistor R1, the signal input terminal of the detection circuit, is connected to the signal output terminal 3 of pressure sensor A2 via a wire; the three power switches... The power output terminals 3, 4 and 5, 6 of S2, S3, and S4 are connected to the positive and negative and negative-positive power input terminals of the three electric push rods M1, M2, and M3 via wires. The power input terminal 1 of the fourth power switch S is connected to one pole of the AC 220V power supply via wires. The two power output terminals 2 and 3 of the fourth power switch S are connected to the two ends of the running capacitor C of the capacitor-run motor of the electric winch via wires. The other pole of the AC 220V power supply is connected to the main power input terminal of the capacitor-run motor of the electric winch M via wires.

[0020] Figure 1 , 2As shown in Figures 3, 4, and 5, when the new device is moved to a new location, the operator holds handle 27 and pushes the entire device linearly. The entire device will move linearly. Turning the handle to the left or right will cause the entire device to turn forward and right, thus facilitating the movement of the device to the work location (the handle can also be dragged by hand to move the device). Before hoisting, the operator inserts the power plug (with a long, slack wire) connected to the power module into the socket of a nearby power outlet. The power module A1 is then powered on, and pins 3 and 4 of the power module A1 output a stable 12V DC power supply to the power switches S4, S2, S3 and the detection circuit, as well as the power input terminal of the pressure sensor. Before the new device is hoisted to its position, the operator moves the handle of the power switch S2 to the left. The positive and negative power input terminals of the electric push rod M1 are energized, and its movable column drives the pressure sensor A2 downward. After the operator visually observes that the pressure sensor A2's contact surface touches the ground, the operator turns off the power switch S2. In practice, when the rear end of the equipment is not off the ground, the pressure surface of pressure sensor A2 experiences relatively high pressure, resulting in a relatively large voltage signal output from pin 3 of pressure sensor A2. Conversely, when the weight of the hoisted goods is too large and the goods are just off the ground, the pressure surface of pressure sensor A2 will also be off the ground, resulting in relatively low pressure and a relatively small voltage signal output from pin 3 of pressure sensor A2. Specifically, when the hoisted goods are of suitable weight and the pressure surface of pressure sensor A2 is not off the ground, the voltage signal output from pin 3 of pressure sensor A2 is relatively high. This voltage signal is divided by resistors R1 and R2 and enters the base of transistor T1, exceeding 0.7V. Transistor T1 will conduct, and its collector will output a low level, which enters the negative power input terminal of relay J1. Relay J1 is energized, closing its control power input terminal and normally closed contact terminal, thus preventing alarm B from sounding. This indicates that the hoisted goods do not exceed the weight threshold, and the workers can continue the hoisting operation. When the load being lifted is relatively heavy and the pressure sensor A2's contact surface is off the ground, the voltage signal output from pin 3 of the pressure sensor A2 is relatively low. This voltage signal is divided by resistors R1 and R2 and enters the base of transistor T1, where it is below 0.7V. Transistor T1 will then cut off, and its collector output will no longer be low-level and will enter the negative power input terminal of relay J1. Relay J1 will be de-energized and will no longer engage, closing its control power input terminal and normally closed contact terminal. Alarm B will be energized and sound, indicating that the load being lifted exceeds the weight threshold. Workers can stop the lifting operation (the weight of the load being lifted can be reduced before continuing the lifting operation).During hoisting operations, hook 3 hooks onto the cargo to be hoisted. Then, the operator moves the handle of S1 to the left, energizing one end of the motor's operating capacitor C and causing the motor shaft to rotate counter-clockwise. Under the action of the internal gears of the electric winch, its winding wheel winds up the wire rope 4, thus gradually raising the hook 3 (the cargo position also rises accordingly). Once the desired height is reached, the power switch S1 is turned off. The operator can then use the handle to move the vehicle body 2, facilitating the transfer of the equipment to the corresponding work point for unloading. After the cargo is hoisted into position, the operator moves the handle of S1 to the right, energizing the other end of the motor's operating capacitor C and causing the motor shaft to rotate clockwise. Under the action of the internal gears of the electric winch, its winding wheel unwinds the wire rope 4, thus gradually lowering the hook 3 (the cargo position also falls accordingly). Once the desired height is reached, the power switch S1 is turned off. After reaching the desired height, the hook can be removed, completing one hoisting cycle. In this new invention, when the operator moves the handle of the power switch S4 to the left or right as needed, the positive and negative or negative and positive power input terminals of the electric push rod M3 will be energized. After the positive and negative power input terminals of the electric push rod M3 are energized, its movable column will drive the first cantilever, the second cantilever, and the cargo to rise in height (the elevation angle increases) to facilitate the hoisting of the cargo. After reaching the desired position, the power switch S4 will be turned off. After the negative and positive power input terminals of the electric push rod M3 are energized, its movable column will drive the first cantilever, the second cantilever, and the cargo to fall in height (the elevation angle decreases) to facilitate the hoisting of the cargo. After reaching the desired position, the power switch S4 will be turned off. When the operator moves the handle of power switch S3 left or right as needed, the positive and negative or negative and positive power input terminals of electric push rod M3 will be energized. After the positive and negative power input terminals of electric push rod M3 are energized, its movable column will drive the second cantilever to move forward along the first cantilever, increasing the length of the two cantilever arms to facilitate lifting goods. After reaching the desired position, power switch S3 will be turned off. Conversely, after the negative and positive power input terminals of electric push rod M3 are energized, its movable column will drive the second cantilever to move backward along the first cantilever, decreasing the length of the two cantilever arms to facilitate lifting goods. After reaching the desired position, power switch S3 will be turned off. It should be noted that while adjusting the length of the two cantilever arms, the electric winch needs to be controlled to work in coordination. When the length of the two cantilever arms is relatively short, the winding shaft of the electric winch is controlled by power switch S1 to wind up the wire rope. When the length of the two cantilever arms is relatively long, the winding shaft of the electric winch is controlled by power switch S1 to unwind the wire rope (power switch S1 will be turned off after reaching the desired position).

[0021] Figure 1 , 2As shown in Figures 3, 4, and 5, the operator can easily push the equipment to the relevant work position by operating the handle at different angles. Under the action of the second electric push rod, the length of the two cantilever arms can be easily adjusted, and the third electric push rod can adjust the pitch angle of the cantilever arms and hooks, etc., thus expanding the lifting operation range. Under the action of the electric winch and wire rope, if the goods exceed the lifting weight threshold after being lifted off the ground, the alarm can prompt the operator to stop the lifting operation in real time, thus preventing the equipment from tipping over as much as possible and achieving a relatively safer lifting effect. Figure 5 As shown, power module A1 is a finished product of AC 220V to DC 12V power module; resistors R1 and R2 have resistance values ​​of 5.6KΩ and 350Ω respectively; alarm B is a finished product of LTE-5060 audible and visual alarm; pressure sensor A2 is a small weighing sensor of model HZC-H1, which has two power input terminals and one signal output terminal. The larger the weight of the detected object, the higher the voltage signal output of the signal output terminal, and vice versa; relay J1 is model DC12V; electric winch M has a power of 4KW; capacitor C is model 100 1μF / 400V; electric push rod M1 is a finished product of 10W small reciprocating electric telescopic rod, electric push rods M2 and M3 are finished products of 200W high-power reciprocating electric telescopic rod, and transistor T1 is model 9013 (NPN type).

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0023] Furthermore, it should be understood that although this specification describes the 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.

Claims

1. A novel mobile cantilever lifting mechanism, comprising an electric winch, a cantilever, a vehicle body, a hook, a wire rope, pulleys, a control box, an electric push rod, a pressure sensor, and a fixed arm, characterized in that, It also has a detection circuit; support plates are fixedly installed on both sides of the front end of the vehicle body, and wheels are fixedly installed on the lower front ends of the two support plates respectively. An axle is rotatably installed on the rear of the vehicle body, and a crossbar is laterally fixedly installed on the lower end of the axle. Steering wheels are rotatably installed on both ends of the crossbar respectively; there are multiple electric push rods. The cylinder of the first electric push rod is fixedly installed on one side of the vehicle body, and the movable column of the first electric push rod is located outside the lower end of the vehicle body. The pressure sensor is fixedly installed on the lower end of the movable column of the first electric push rod. The control box is fixedly installed on the front end of the vehicle body; there is a mounting groove on one side of the upper end of the control box, and the electric winch is fixedly installed inside the lower end of the control box. The upper and lower ends of the fixed arm are open structures, and the lower end of the fixed arm is fixedly installed in the mounting groove of the control box; there are at least two cantilever arms and pulleys, and the upper and lower ends of the cantilever arms are open structures; the upper end of the fixed arm and The rear end of the first cantilever is hinged together. The rear side of the second cantilever is movably fitted inside the front of the first cantilever. The cylinder of the second electric push rod is fixedly installed on the upper outer end of the first cantilever. The movable column of the second electric push rod is fixedly installed together with the upper outer end of the second cantilever. The lower end of the cylinder of the third electric push rod is hinged to the upper outer front of the vehicle body. The upper end of the movable column of the third electric push rod is hinged to the middle of the lower outer end of the first cantilever. The two pulleys are respectively rotatably installed inside the rear end of the first cantilever and the front end of the second cantilever. One end of the wire rope is fixedly installed on the winding wheel of the electric winch. The other end of the wire rope passes over the upper end of the grooves of the first and second pulleys. The upper end of the hook and the other end of the wire rope are fixedly installed together. The detection circuit is installed in the control box. The signal input terminal of the detection circuit and the signal output terminal of the pressure sensor are electrically connected.

2. The novel mobile cantilever lifting mechanism according to claim 1, characterized in that, The outer diameter of the second cantilever is smaller than the inner diameter of the first cantilever.

3. The novel mobile cantilever lifting mechanism according to claim 1, characterized in that, The winding wheel and the fixed arm are in the same vertical plane.

4. The novel mobile cantilever lifting mechanism according to claim 1, wherein, When the movable column of the second electric push rod is at the front stop point, the rear end of the second cantilever is located at the front inner end of the first cantilever.

5. The novel mobile cantilever lifting mechanism according to claim 1, wherein, An operating handle is fixedly installed on the upper end of the shaft.

6. The novel mobile cantilever lifting mechanism according to claim 1, wherein, The pressure sensor's force-bearing surface is located on the lower side.

7. The novel mobile cantilever lifting mechanism according to claim 1, wherein, The detection circuit includes electrically connected resistors, transistors, relays, and alarms. The positive power input terminal of the alarm is connected to the normally closed contact terminal of the relay, and the positive power input terminal of the relay is connected to the control power input terminal. One end of the first resistor and one end of the second resistor are connected to the base of the transistor. The collector of the transistor is connected to the negative power input terminal of the relay, and the other end of the second resistor is connected to the emitter of the transistor and the negative power input terminal of the alarm.

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