Electrically powered small crane

Abstract

The utility model relates to a kind of electric type small crane, crane includes support and is installed on the support and is hung on the arm assembly, and the arm assembly includes shell, transmission mechanism and motor are equipped on shell, chain with lifting appliance is arranged on the arm assembly, motor is driven lifting appliance lifting by transmission mechanism and chain transmission connection, to make motor drive lifting appliance lift;Limiting component is connected on transmission mechanism, limiting component includes sensor, controller and the mounting rod fixed in shell, limiting block is equipped on mounting rod, sensor can be moved along the axial direction of mounting rod under the drive of transmission mechanism, controller is electrically connected with motor and sensor respectively, sensor is used to detect relative distance and generate feedback signal, controller can control the start-stop of motor according to feedback signal.The utility model provides crane, in automatic hoisting process, avoid to put down lifting appliance too low or promote too high, promote the security and automation level of crane operation.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to an electric mini crane. Background Technology

[0002] Cranes are used to vertically lift and horizontally move heavy objects within a certain range, and are widely used in various fields. However, existing motor-driven cranes, due to the high speed of the motor-driven lifting device, often leave operators insufficient time to react and make it difficult for them to precisely control the position of the lifting device. This can easily lead to situations where the lifting device is lifted too high or lowered too low, affecting work efficiency and safety. Summary of the Invention

[0003] The purpose of this utility model is to solve the problems mentioned in the background art and to provide an electric mini crane.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: An electric mini crane includes a support frame and a boom assembly mounted on the support frame. The boom assembly includes a housing, a transmission mechanism and a motor are provided on the housing, and a chain with a lifting device is threaded through the boom assembly. The motor is connected to the chain via the transmission mechanism so that the motor drives the lifting device to lift and lower. The transmission mechanism is connected to a limiting component, which includes a sensor, a controller, and a mounting rod fixed inside the housing. The mounting rod is provided with a limiting block. The sensor can move along the axial direction of the mounting rod under the drive of the transmission mechanism and detect the relative distance between itself and the limiting block. The controller is electrically connected to the motor and the sensor respectively. The sensor is used to detect the relative distance and generate a feedback signal. The controller can control the start and stop of the motor according to the feedback signal.

[0005] Understandably, the transmission mechanism converts the chain's movement distance into the sensor's movement distance, making the relative distance between the sensor and the limit block correspond to the chain's movement length. Thus, by detecting the relative distance between the sensor and the limit block, the distance the spreader moves upward or downward can be determined, thereby limiting the spreader's upward or downward movement. This achieves automatic detection and control of the spreader's lifting limit positions, facilitating precise positioning of the spreader and preventing it from being lowered too low or raised too high during automatic lifting, thus improving the safety and automation level of crane operations.

[0006] In one embodiment, there are two sensors, and correspondingly two limiting blocks are provided. The two limiting blocks are arranged at intervals along the axial direction of the mounting rod, and the two sensors are located between the two limiting blocks.

[0007] Understandably, by setting up two sensors and corresponding limit blocks, the two sensors can independently detect the lifting limit position and the lowering limit position of the lifting device.

[0008] In one embodiment, the limiting component further includes a connector connected between the mounting rod and the transmission mechanism and capable of moving along the axial direction of the mounting rod under the drive of the transmission mechanism, and the sensor is disposed on the connector.

[0009] In one embodiment, the transmission mechanism includes a lead screw, one end of the connector is threaded to the lead screw, and the other end of the connector is sleeved on the mounting rod and can slide along the axial direction of the mounting rod.

[0010] In one embodiment, the transmission mechanism further includes an output shaft and a timing belt. A first timing pulley is fixed on the output shaft, and a second timing pulley is fixed on the lead screw. The lead screw is threadedly connected to the connector, and the first timing pulley drives the second timing pulley to rotate through the timing belt.

[0011] In one embodiment, the sensor is configured as a displacement sensor or a proximity switch.

[0012] In one embodiment, the transmission mechanism further includes an input shaft, a worm, a worm wheel, a sprocket, and an output shaft. The input shaft is connected to the output end of the motor and is driven by the worm through gear meshing. The worm wheel meshes with the worm and is coaxially fixed to the output shaft with the sprocket. The chain meshes with the sprocket.

[0013] In one embodiment, the transmission mechanism further includes a ratchet, a pawl, and a spring. The ratchet is fixed to the output shaft, and the pawl is positioned circumferentially on the ratchet and can cooperate with the spring to engage or release the ratchet.

[0014] In one embodiment, the boom assembly further includes a lifting boom and a connecting boom, the lifting boom and the connecting boom being connected and communicating with the housing, and the boom assembly being connected to the support via bearings and being rotatable relative to the support.

[0015] In one embodiment, the support includes a column and a cantilever, the cantilever being vertically connected between the column and the connecting arm, and the column being capable of extending and retracting along its own axial direction.

[0016] The advantages of this utility model: This utility model claims an electric mini crane that, through the cooperation of sensors and limit blocks, limits the upward and downward movement of the lifting device, thereby achieving automatic detection and control of the lifting limit position of the lifting device. This facilitates precise positioning of the lifting device and prevents it from being lowered too low or raised too high during automatic lifting, thus improving the safety and automation level of crane operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a motor, transmission mechanism, and limiting component provided in an embodiment of the present invention; Figure 2 A schematic diagram of a motor and transmission mechanism provided in an embodiment of the present invention; Figure 3 A perspective view of a crane provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of a boom assembly provided in one embodiment of the present invention.

[0019] Reference numerals: 100, crane; 10, support; 11, column; 12, cantilever; 20, boom assembly; 21, housing; 22, lifting boom; 23, connecting arm; 30, transmission mechanism; 31, lead screw; 311, second synchronous pulley; 32, output shaft; 321, first synchronous pulley; 322, worm gear; 323, sprocket; 324, ratchet; 3241, pawl; 3242, spring; 33, synchronous belt; 34, input shaft; 35, worm gear; 40, motor; 50, chain; 51, lifting device; 60, limit assembly; 61, sensor; 62, mounting rod; 63, limit block; 64, connector. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0025] Please see Figures 1 to 4 An embodiment of this utility model provides an electric mini crane 100. The crane 100 includes a support 10 and a boom assembly 20 mounted on the support 10. The boom assembly 20 includes a housing 21. The housing 21 is provided with a transmission mechanism 30 and a motor 40. A chain 50 with a lifting device 51 is threaded through the boom assembly 20. The motor 40 is connected to the chain 50 through the transmission mechanism 30 so that the motor 40 drives the lifting device 51 to lift.

[0026] The transmission mechanism 30 is connected to a limiting component 60, which includes a sensor 61, a controller, and a mounting rod 62 fixed in the housing 21. The mounting rod 62 is provided with a limiting block 63. The sensor 61 can move along the axial direction of the mounting rod 62 under the drive of the transmission mechanism 30 and detect the relative distance between itself and the limiting block 63. The controller is electrically connected to the motor 40 and the sensor 61 respectively. The sensor 61 is used to detect the relative distance between the sensor 61 and the limiting block 63 and generate a feedback signal. The controller can control the start and stop of the motor 40 according to the feedback signal.

[0027] It can be understood that the transmission mechanism 30 converts the moving distance of the chain 50 into the moving distance of the sensor 61, so that the relative distance between the sensor 61 and the limit block 63 corresponds to the moving length of the chain 50. In this way, by detecting the relative distance between the sensor 61 and the limit block 63, the distance that the lifting device 51 moves up or down can be known, thereby limiting the upward or downward movement of the lifting device 51. This realizes the automatic detection and control of the lifting limit position of the lifting device 51, so as to facilitate the precise positioning of the lifting device 51. During the automatic lifting process, it avoids lowering the lifting device 51 too low or raising it too high, thereby improving the safety and automation level of the crane 100 operation.

[0028] Before operation, the limit value of the relative distance between sensor 61 and limit block 63 is preset, and this limit value can be adjusted according to the operation requirements of crane 100. During operation, the signal generated by sensor 61 is transmitted to controller. Controller compares the received signal with the preset limit value of the relative distance and makes a logical judgment. If it is determined that the position of lifting device 51 has reached the limit position, controller will control motor 40 to stop rotating.

[0029] like Figure 1 As shown, specifically, there are two sensors 61, and correspondingly two limit blocks 63. The two limit blocks 63 are arranged at intervals along the axial direction of the mounting rod 62. Both sensors 61 are mounted on the connector 64 and located between the two limit blocks 63. By setting two sensors 61 and correspondingly setting two limit blocks 63, the two sensors 61 can independently detect the upper limit position and lower limit position of the lifting device 51.

[0030] Alternatively, sensor 61 may be configured as a displacement sensor or a proximity switch.

[0031] In one embodiment, the limiting component 60 further includes a connector 64, which is connected between the mounting rod 62 and the transmission mechanism 30, and can move along the axial direction of the mounting rod 62 under the drive of the transmission mechanism 30. Two sensors 61 are respectively disposed on both sides of the connector 64, and the sensors 61 move linearly between the two limiting blocks 63 as the connector 64 moves.

[0032] In one embodiment, the transmission mechanism 30 includes a lead screw 31 mounted on the housing 21. One end of a connector 64 is threaded to the lead screw 31, and the other end of the connector 64 is sleeved on a mounting rod 62 and can slide along the axial direction of the mounting rod 62. This configuration converts the rotational motion of the lead screw 31 into the linear motion of the sensor 61, which helps to improve the accuracy of position detection.

[0033] Furthermore, the transmission mechanism 30 also includes an output shaft 32 and a synchronous belt 33. The output shaft 32 is mounted on the housing 21 by bearings. A first synchronous pulley 321 is fixed on the output shaft 32, and a second synchronous pulley 311 is fixed on the lead screw 31. The lead screw 31 is threadedly connected to the connector 64. The first synchronous pulley 321 drives the second synchronous pulley 311 to rotate through the synchronous belt 33, thereby realizing the synchronous rotation of the output shaft 32 and the lead screw 31.

[0034] like Figure 2 As shown, the transmission mechanism 30 further includes an input shaft 34, a worm gear 35, a worm wheel 322, and a sprocket 323. The worm wheel 322 and the sprocket 323 are both fixed on the output shaft 32. The input shaft 34 is connected to the output end of the motor 40 and is driven by the worm gear 35 through gear meshing. The worm wheel 322 meshes with the worm gear 35 and is coaxially fixed on the output shaft 32 with the sprocket 323. The chain 50 meshes with the sprocket 323.

[0035] In one embodiment, the transmission mechanism 30 further includes a ratchet 324, a pawl 3241, and a spring 3242. The ratchet 324 is fixed to the output shaft 32. The pawl 3241 is positioned circumferentially around the ratchet 324 and engages with the spring 3242 to engage or release the ratchet 324. When the lifting device 51 rises, the pawl 3241 can slide over the back of the teeth of the ratchet 324, allowing normal lifting. When the sprocket 323 attempts to rotate in the opposite direction, such as when a heavy object falls due to gravity, the pawl 3241 will quickly engage in the tooth groove of the ratchet 324 under the action of the spring 3242, preventing it from reversing and thus reliably keeping the heavy object suspended in the air.

[0036] like Figure 3 and Figure 4 As shown, in one embodiment, the boom assembly 20 further includes a lifting boom 22 and a connecting boom 23. The lifting boom 22 and the connecting boom 23 are respectively connected to and communicate with the housing 21. The lifting boom 22 and the connecting boom 23 are arranged at an angle. The chain 50 passes through the connecting boom 23, the housing 21 and the lifting boom 22 in sequence and extends out at both ends. The boom assembly 20 is connected to the bracket 10 through bearings and can rotate relative to the bracket 10, so that the boom assembly 20 can be rotated to adjust its position, thereby expanding the operating coverage of the crane 100 and improving the flexibility and convenience of using the crane 100.

[0037] In this embodiment, the support 10 includes a column 11 and a cantilever 12. The cantilever 12 is vertically connected between the column 11 and the connecting arm 23. The column 11 is configured as a telescopic sleeve structure, which allows the column 11 to extend and retract along its own axial direction, so as to adjust the height of the boom assembly 20 relative to the ground, and enable the crane 100 to flexibly adapt to different work spaces and lifting height requirements.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the patent protection scope of this utility model should be determined by the appended claims.

Claims

1. A small electric crane, characterized in that, The crane (100) includes a support (10) and a boom assembly (20) mounted on the support (10). The boom assembly (20) includes a housing (21), a transmission mechanism (30) and a motor (40) are provided on the housing (21). A chain (50) with a lifting device (51) is threaded through the boom assembly (20). The motor (40) is connected to the chain (50) through the transmission mechanism (30) so that the motor (40) drives the lifting device (51) to lift. The transmission mechanism (30) is connected to a limiting component (60), which includes a sensor (61), a controller, and a mounting rod (62) fixed in the housing (21). The mounting rod (62) is provided with a limiting block (63). The sensor (61) can move along the axial direction of the mounting rod (62) under the drive of the transmission mechanism (30) and detect the relative distance between itself and the limiting block (63). The controller is electrically connected to the motor (40) and the sensor (61). The sensor (61) is used to detect the relative distance and generate a feedback signal. The controller can control the start and stop of the motor (40) according to the feedback signal.

2. The electric mini crane according to claim 1, characterized in that, There are two sensors (61), and two corresponding limit blocks (63) are set. The two limit blocks (63) are arranged at intervals along the axial direction of the mounting rod (62), and the two sensors (61) are located between the two limit blocks (63).

3. The electric mini crane according to claim 1, characterized in that, The limiting component (60) also includes a connector (64), which is connected between the mounting rod (62) and the transmission mechanism (30) and can move along the axial direction of the mounting rod (62) under the drive of the transmission mechanism (30). The sensor (61) is disposed on the connector (64).

4. The electric mini crane according to claim 3, characterized in that, The transmission mechanism (30) includes a lead screw (31), one end of the connector (64) is threaded to the lead screw (31), and the other end of the connector (64) is sleeved on the mounting rod (62) and can slide along the axial direction of the mounting rod (62).

5. The electric mini crane according to claim 4, characterized in that, The transmission mechanism (30) further includes an output shaft (32) and a synchronous belt (33). A first synchronous pulley (321) is fixed on the output shaft (32), and a second synchronous pulley (311) is fixed on the lead screw (31). The lead screw (31) is threadedly connected to the connecting member (64). The first synchronous pulley (321) drives the second synchronous pulley (311) to rotate through the synchronous belt (33).

6. The electric mini crane according to claim 1, characterized in that, The sensor (61) is configured as a displacement sensor or a proximity switch.

7. The electric mini crane according to claim 1, characterized in that, The transmission mechanism (30) further includes an input shaft (34), a worm (35), a worm wheel (322), a sprocket (323), and an output shaft (32). The input shaft (34) is connected to the output end of the motor (40) and is driven by the worm (35) through gear meshing. The worm wheel (322) meshes with the worm (35) and is coaxially fixed on the output shaft (32) with the sprocket (323). The chain (50) meshes with the sprocket (323).

8. The electric mini crane according to claim 7, characterized in that, The transmission mechanism (30) further includes a ratchet (324), a pawl (3241), and a spring (3242). The ratchet (324) is fixed to the output shaft (32). The pawl (3241) is located in the circumferential position of the ratchet (324) and can cooperate with the spring (3242) to engage or release the ratchet (324).

9. The electric mini crane according to claim 1, characterized in that, The boom assembly (20) further includes a lifting boom (22) and a connecting boom (23). The lifting boom (22) and the connecting boom (23) are respectively connected to and communicate with the housing (21). The boom assembly (20) is connected to the bracket (10) through a bearing and can rotate relative to the bracket (10).

10. The electric mini crane according to claim 9, characterized in that, The support (10) includes a column (11) and a cantilever (12). The cantilever (12) is vertically connected between the column (11) and the connecting arm (23), and the column (11) can extend and retract along its own axial direction.

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