Electric hoist with balance adjustment function
By installing an angle sensor and a balancing hydraulic cylinder at the lower end of the electric hoist's sling, the sling's swing can be adjusted in real time, solving the problem of sling sway and improving the stability and service life of the electric hoist.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO SHUANGDA MASCH CO LTD
- Filing Date
- 2025-07-19
- Publication Date
- 2026-07-07
AI Technical Summary
The hoisting rope is prone to swaying during startup, shutdown and operation, especially in windy conditions, which affects operating accuracy, equipment life and safety.
An inclination sensor is installed at the lower end of the sling. The controller works in conjunction with the balancing hydraulic cylinder to detect and counteract the sling's swing inertial force in real time. The lateral balance adjustment of the sling is achieved using a balance frame and limit wheels.
It significantly reduces the swing amplitude of the slings, improves the stability of the slings, extends the equipment life, and reduces equipment wear and maintenance costs.
Smart Images
Figure CN224467398U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electric hoist technology, and in particular relates to an electric hoist with balance adjustment function. Background Technology
[0002] Electric hoists, as a commonly used small lifting machine, play an important role in many fields such as industrial production, warehousing and logistics, and construction. Due to their advantages such as small size, light weight, simple operation, and high lifting power, they are widely used for lifting, moving, and loading / unloading various materials. From their working principle, the electric motor transmits power to the reduction gear through a coupling, which in turn drives the drum or sprocket to rotate, realizing the vertical lifting and horizontal movement of the lifting device and the load by the wire rope or chain. Simultaneously, the electrical control unit provides precise start and stop control of the motor.
[0003] However, in actual use, the problem of rope swaying in electric hoists has always been prominent. On the one hand, during startup, shutdown, and operation, the rope is prone to swaying due to inertia. Especially during horizontal startup and shutdown, the probability and amplitude of swaying are often greater than during ascent and descent. Furthermore, the greater the speed difference and the longer the rope dangling, the greater the amplitude of swaying caused by inertia. On the other hand, external environmental factors such as wind also significantly affect the stability of the rope. In windy weather, the rope swaying problem is more severe. This not only increases the difficulty for operators to accurately place the hoisted item at the target location, prolonging operation time and reducing work efficiency, but also may shorten the equipment's lifespan due to the mutual squeezing and friction between the rope and the electric hoist. In cases of excessive swaying, it can even cause accidents such as the load colliding with surrounding objects or the hook becoming detached, posing a serious threat to personnel safety and property.
[0004] Therefore, it is essential to invent an electric hoist with a balance adjustment function. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides an electric hoist with a balance adjustment function, including a mounting base, a drive motor, a take-up and release roller, a reducer, a lifting hydraulic cylinder, a lifting frame, a balance adjuster, a sling, an inclination sensor, and a hook. The drive motor, the take-up and release roller, and the reducer are mounted on the mounting base. The two ends of the take-up and release roller, which is rotatably mounted on the mounting base, are respectively connected to the output end of the drive motor and the reducer. The output end of the lifting hydraulic cylinder, which is symmetrically fixedly mounted on the mounting base, is fixed to the lifting frame. The lifting frame is fixedly connected to the balance adjuster. The lower end of the sling wound on the take-up and release roller passes through the balance adjuster, and an inclination sensor and a hook are installed at its lower end.
[0006] Preferably, the tilt sensor mounted on the sling is located near the hook mounted at its lower end, and the tilt sensor and balance adjuster are connected to a controller mounted on the outside of the mounting base.
[0007] Preferably, the balance adjuster includes a housing, a balance frame, a sliding column, a slide cylinder, limit wheels, a balance hydraulic cylinder, and a hole. Two symmetrically arranged lifting frames are fixedly installed on the outside of the housing. A sliding column is installed at one end of the balance frame that is slidably installed inside the housing, and the sliding column slides in cooperation with the slide cylinder fixedly installed on the outside of the housing. Two symmetrically arranged limit wheels are rotatably installed on the inside of the balance frame. The output end fixedly installed on the outside of the housing is fixed to the other end of the balance frame. A hole is provided through the housing to allow the sling to pass through.
[0008] Preferably, the control element of the balancing hydraulic cylinder is connected to the controller via a circuit, and the controller is connected to the tilt sensor via a circuit. The controller can receive, analyze, and process the tilt angle signal from the tilt sensor, and control the operation of the balancing hydraulic cylinder through the control element.
[0009] Preferably, the output end of the balancing hydraulic cylinder can drive the balancing frame slidably installed inside the housing to move horizontally, and the sliding column fixedly installed at one end of the balancing frame can slide horizontally inside the sliding cylinder installed on the outside of the housing.
[0010] Preferably, two symmetrically arranged limiting wheels are rotatably installed inside the balance frame and roll in contact with the sling. The sling can pass through the upper hole into the housing and be restricted by the rolling of the two limiting wheels, and then pass through the lower hole out of the housing.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] This invention utilizes an inclination sensor installed at the lower end of the sling near the hook to accurately and in real-time detect the sling's tilt angle. Once the sling begins to swing or tilt, the inclination sensor quickly transmits the detected tilt angle signal to the controller. Upon receiving the signal, the controller rapidly analyzes and processes it, and based on a preset program and algorithm, immediately controls the balancing hydraulic cylinder to operate via control elements. The output end of the balancing hydraulic cylinder drives the balancing frame to perform a lateral horizontal movement, effectively and promptly counteracting the inertial force generated by the sling's swing, thereby quickly reducing the sling's swing amplitude and rapidly adjusting the sling to a balanced state, significantly improving the timeliness and accuracy of sling balance adjustment.
[0013] The unique structural design of this utility model's balance adjuster greatly enhances overall stability. The balance frame, slidably mounted inside the housing, has a sliding column at one end that slides in conjunction with a sliding cylinder fixedly mounted outside the housing, ensuring the balance frame's stability and guidance during lateral movement. Two symmetrically arranged limiting wheels, rotatably mounted inside the balance frame, roll in contact with the sling, effectively limiting the sling's swing range and reducing friction during movement, thus preventing damage to the sling.
[0014] This invention significantly reduces the mutual compression and friction between the sling and other components of the electric hoist by effectively reducing the swing amplitude of the sling. This allows the sling to operate in a relatively stable state, greatly reducing the stress on various components, decreasing equipment wear and tear, and thus effectively extending the overall service life of the electric hoist and lowering maintenance and replacement costs. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0016] Figure 2 This is a partial cross-sectional structural diagram of the balance regulator of this utility model.
[0017] Figure 3 This is another overall structural schematic diagram of this utility model.
[0018] In the picture:
[0019] Mounting base 1, drive motor 2, take-up and release rollers 3, reducer 4, lifting hydraulic cylinder 5, lifting frame 6, balance adjuster 7, machine box 71, balance frame 72, sliding column 73, slide cylinder 74, limit wheel 75, balance hydraulic cylinder 76, hole 77, sling 8, tilt sensor 9, hook 10. Detailed Implementation
[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.
[0022] As attached Figure 1 To be continued Figure 3 As shown:
[0023] This utility model provides an electric hoist with a balance adjustment function, including a mounting base 1, a drive motor 2, a take-up and release roller 3, a reducer 4, a lifting hydraulic cylinder 5, a lifting frame 6, a balance adjuster 7, a sling 8, an inclination sensor 9, and a hook 10. The drive motor 2, the take-up and release roller 3, and the reducer 4 are mounted on the mounting base 1. The two ends of the take-up and release roller 3, which is rotatably mounted on the mounting base 1, are respectively connected to the output end of the drive motor 2 and the reducer 4. The output end of the lifting hydraulic cylinder 5, which is symmetrically fixedly mounted on the mounting base 1, is fixed to the lifting frame 6. The lifting frame 6 is fixedly connected to the balance adjuster 7. The lower end of the sling 8 wound on the take-up and release roller 3 passes through the balance adjuster 7, and the inclination sensor 9 and the hook 10 are installed at its lower end.
[0024] Furthermore, the tilt sensor 9, installed on the sling 8, is positioned close to the hook 10 installed at its lower end, with the distance between them controlled within the range of 15-30cm. The tilt sensor 9 uses an IP67-rated waterproof and dustproof housing made of 304 stainless steel. It is fixed to the sling 8 using a specially designed arc-shaped clamp, with a rubber anti-slip pad attached to the inside of the clamp to prevent wear on the sling 8 and ensure stable sensor installation. The tilt sensor 9 is connected to the controller on the outside of the mounting base 1 via a shielded twisted-pair cable, with the cable wrapped in a polyurethane wear-resistant sheath. The control circuit of the balance adjuster 7 is also connected to this controller, forming a complete signal closed loop. The controller is a PLC programmable logic controller, installed in an aluminum alloy protective box with ventilation holes. The protective box is fixed to a pre-set mounting plate on the side of the mounting base 1 with bolts, enabling real-time reception of tilt signals and accurate output of balance adjustment commands.
[0025] Furthermore, the balance adjuster 7 includes a housing 71, a balance frame 72, a sliding column 73, a slide cylinder 74, a limit wheel 75, a balance hydraulic cylinder 76, and a hole 77. The housing 71 is welded from Q235 steel plate and has an overall rectangular structure. Two lifting frames 6 are symmetrically fixed to its external sides by bolts. The lifting frames 6 are bent channel steel parts, and the connection parts with the housing 71 are provided with reinforcing ribs. The internal side walls of the housing 71 have transverse T-shaped sliding grooves. The sliders on both sides of the balance frame 72 slide in the sliding grooves to realize the transverse sliding of the balance frame 72 within the housing 71. One end of the balance frame 72 is rigidly connected to the sliding column 73 through a flange. Its outer diameter is in clearance fit with the inner diameter of the slide cylinder 74, which is fixed to the outside of the housing 71 by a bracket. The inner wall of the slide cylinder 74 is coated with lithium-based grease to reduce sliding friction. Two symmetrically arranged limit wheels 75 are rotatably mounted on the inner side of the balance frame 72 via deep groove ball bearings. The rims of the limit wheels 75 are made of polyurethane, and the wheel bodies are made of aluminum alloy. The distance between the two limit wheels 75 is slightly larger than the diameter of the sling 8, forming a rolling guide for the sling 8. The output end of the balance hydraulic cylinder 76 is fixed to the outside of the housing 71 by bolts and is fixed to the other end of the balance frame 72 by a spherical bearing. The upper and lower end faces of the housing 71 are symmetrically perforated with holes 77 that allow the sling 8 to pass through. The edges of the holes 77 are rounded with a radius of 5mm to avoid stress concentration when the sling 8 passes through.
[0026] Furthermore, the control elements of the balancing hydraulic cylinder 76 are an electromagnetic directional valve and a proportional flow valve, both integrated on a hydraulic control block, which is bolted to a mounting bracket on the outside of the housing 71. The electromagnetic directional valve and the proportional flow valve are connected to the controller via shielded cables, with waterproof aviation connectors at the cable joints. Data transmission between the controller and the tilt sensor 9 is achieved via the RS485 communication protocol. The controller has preset angle threshold parameters; when the tilt angle signal received from the tilt sensor 9 exceeds the threshold, the controller immediately activates the PID adjustment algorithm, controlling the opening of the proportional flow valve by outputting a PWM pulse signal, and simultaneously controlling the electromagnetic directional valve to switch the working oil circuit, thereby controlling the extension and retraction of the balancing hydraulic cylinder 76 and ensuring an adjustment accuracy of ±0.5mm.
[0027] Furthermore, the output end of the balancing hydraulic cylinder 76 is rigidly connected to the balancing frame 72 via a piston rod. A displacement sensor is installed at the end of the piston rod to monitor the extension and retraction in real time and feed it back to the controller. When the balancing hydraulic cylinder 76 is working, its output end can drive the balancing frame 72 inside the housing 71 to reciprocate in the horizontal direction. A sliding column 73 fixedly installed at one end of the balancing frame 72 and a sliding cylinder 74 outside the housing 71 form a precision guide pair. Dustproof sealing rings are provided at both ends of the sliding cylinder 74 to prevent dust from entering and affecting the sliding accuracy. An anti-collision rubber pad is installed at the end of the sliding column 73 extending out of the sliding cylinder 74 to avoid rigid collision when the balancing frame 72 moves to its limit position, ensuring smooth operation.
[0028] Furthermore, two symmetrically arranged limiting wheels 75 are rotatably mounted within the balance frame 72 via pivot pins. The wheel surfaces maintain rolling contact with the sling 8. The contact pressure is achieved by adjusting the mounting wheel distance of the limiting wheels 75, ensuring that the sling 8 does not deviate significantly during vertical lifting. The sling 8 is a 6×37 steel wire rope with a diameter of 10-16mm. Its upper end passes through the hole 77 above the housing 71, through the clamping channel formed by the two limiting wheels 75, and the limiting wheels 75 rotate synchronously with the movement of the sling 8, converting sliding friction into rolling friction and reducing the wear rate of the sling 8. After passing through the balance frame 72, the sling 8 exits through the hole 77 below the housing 71. The line connecting the centers of the two holes 77 coincides with the vertical axis of the sling 8, ensuring that the sling 8 remains within the preset movement trajectory during balance adjustment.
[0029] The working principle is as follows: First, when the electric hoist is started, the drive motor 2 drives the take-up and release rollers 3 to rotate through the reducer 4. The take-up and release rollers 3 wind up or release the sling 8, thereby realizing the lifting and lowering action of the hook 10 and the suspended object. At the same time, the lifting hydraulic cylinder 5 on the mounting base 1 can drive the lifting frame 6 and the balance adjuster 7 to lift and lower as a whole through extension and retraction, adapting to different working height requirements.
[0030] Secondly, during the lifting process, if the sling 8 tilts or swings left or right due to inertia, wind force or other factors, the tilt sensor 9 near the hook 10 will detect the tilt angle of the sling 8 in real time and transmit the signal to the controller through the RS485 communication protocol.
[0031] Then, the controller analyzes the received tilt angle signal. When the angle exceeds the preset threshold, it immediately starts the PID adjustment algorithm and sends control commands to the control elements (solenoid directional valve and proportional flow valve) of the balance hydraulic cylinder 76.
[0032] Next, the solenoid directional valve switches the working oil circuit according to the instruction to determine the extension and retraction direction of the balance hydraulic cylinder 76; the proportional flow valve adjusts its opening by receiving PWM pulse signals to control the hydraulic oil flow, and thus control the extension and retraction speed of the piston rod of the balance hydraulic cylinder 76.
[0033] Subsequently, the piston rod of the balancing hydraulic cylinder 76 drives the balancing frame 72 to move laterally within the housing 71: if the sling 8 tilts to the left, the balancing frame 72 moves to the right; if the sling 8 tilts to the right, the balancing frame 72 moves to the left. During this process, the balancing frame 72 maintains stable guidance through the cooperation of the sliding column 73 and the sliding cylinder 74, while the limiting wheel 75 forms a rolling clamp on the sling 8. The reverse force generated by the lateral displacement counteracts the swing inertia of the sling 8, reducing the tilt amplitude.
[0034] Meanwhile, the displacement sensor at the end of the piston rod feeds back the extension and retraction amount to the controller in real time. The controller then fine-tunes the action of the balance hydraulic cylinder 76 based on the feedback data to ensure adjustment accuracy.
[0035] Finally, when the sling 8 returns to a vertical state, the tilt sensor 9 detects that the angle has returned to the threshold, the controller stops the balance adjustment command, the balance hydraulic cylinder 76 resets, and the entire system returns to a stable standby state, waiting for the next adjustment trigger.
[0036] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.
Claims
1. An electric hoist with balance adjustment function, characterized in that, The system includes a mounting base (1), a drive motor (2), a take-up and release roller (3), a reducer (4), a lifting hydraulic cylinder (5), a lifting frame (6), a balance adjuster (7), a sling (8), an inclination sensor (9), and a hook (10). The mounting base (1) is equipped with the drive motor (2), the take-up and release roller (3), and the reducer (4). The two ends of the take-up and release roller (3), which is rotatably mounted on the mounting base (1), are respectively connected to the output end of the drive motor (2) and the reducer (4). The output end of the lifting hydraulic cylinder (5), which is symmetrically fixed on the mounting base (1), is fixed to the lifting frame (6). The lifting frame (6) is fixedly connected to the balance adjuster (7). The lower end of the sling (8) wound on the take-up and release roller (3) passes through the balance adjuster (7), and an inclination sensor (9) and a hook (10) are installed at its lower end.
2. An electric hoist with balance adjustment function as described in claim 1, characterized in that: The tilt sensor (9) mounted on the sling (8) is close to the hook (10) mounted at its lower end. The tilt sensor (9) and the balance adjuster (7) are connected to a controller mounted on the outside of the mounting base (1).
3. An electric hoist with balance adjustment function as described in claim 2, characterized in that: The balance adjuster (7) includes a housing (71), a balance frame (72), a sliding column (73), a slide cylinder (74), a limit wheel (75), a balance hydraulic cylinder (76), and a hole (77). Two symmetrically arranged lifting frames (6) are fixedly installed on the outside of the housing (71). The balance frame (72) slidably installed inside the housing (71) has a sliding column (73) installed at one end. The sliding column (73) slides in cooperation with the slide cylinder (74) fixedly installed on the outside of the housing (71). Two symmetrically arranged limit wheels (75) are rotatably installed on the inside of the balance frame (72). The output end fixedly installed on the outside of the housing (71) is fixed to the other end of the balance frame (72). A hole (77) is provided through the housing (71) to allow the sling (8) to pass through.
4. An electric hoist with balance adjustment function as described in claim 3, characterized in that: The control element of the balance hydraulic cylinder (76) is connected to the controller via a line. The controller is connected to the tilt sensor (9) via a line. The controller can receive, analyze and process the tilt angle signal of the tilt sensor (9) and control the operation of the balance hydraulic cylinder (76) through the control element.
5. An electric hoist with balance adjustment function as described in claim 4, characterized in that: The output end of the balancing hydraulic cylinder (76) can drive the balancing frame (72) slidably installed inside the housing (71) to make a horizontal movement. The sliding column (73) fixedly installed at one end of the balancing frame (72) can slide horizontally inside the sliding cylinder (74) installed on the outside of the housing (71).
6. An electric hoist with balance adjustment function as described in claim 5, characterized in that: The balance frame (72) has two symmetrically arranged limiting wheels (75) that are rotatably installed inside and roll in contact with the sling (8). The sling (8) can pass through the upper hole (77) into the housing (71) and be restricted by the two limiting wheels (75) rolling, and then pass through the lower hole (77) out of the housing (71).