Electric hoist with limit protection function

Abstract

The utility model relates to the technical field of safety electric hoist, especially to a electric hoist with limit protection function, including hoist body, the sliding seat of through connecting seat setting in the lower of hoist body, the slider of self -adaptation ground sliding setting on the sliding seat, and the photoelectric sensor of detecting the position of slider relative to the sliding seat, in the utility model, the disc of slider is driven to slide in the limit groove through the hollow sleeve, wherein the disc structure of slider is projected the outside of limit groove, realizes the shelter of photoelectric sensor, thereby based on this, the photoelectric sensor detects, the movable range of steel rope exceeds its setting threshold value, thereby sends the signal to the controller, and then controls the hoist body power off or changes the direction and lowers the steel rope, thereby guarantees the hoist operation of safety.

Description

Technical Field

[0001] This utility model relates to the field of safety electric hoist technology, and in particular to an electric hoist with limit protection function. Background Technology

[0002] Existing patent 202110443238.1 discloses a limit-protection type electric hoist, comprising a motor, a rope drum, an actuating lever, a stop lever, and a positioning light. The actuating lever has a "Z"-shaped structure and is limited by being mounted on the motor; its lower end is connected to the switch button of a second micro switch. The stop lever has a "U"-shaped structure and is connected to the switch button of a first micro switch. In this application, when the height of the object to be lifted is too high and approaches the stop lever, the stop lever deflects, thereby triggering the first micro switch to shut off the motor's power, preventing the goods from being lifted too high and causing a safety accident. Furthermore, when the wire rope on the rope drum is completely unloaded, if the motor continues to drive the rope drum to rotate, the wire rope will inevitably be wound from the other side of the rope drum. This utilizes the lever principle to trigger the button of the second micro switch at the other end of the lever, preventing the rope drum from continuing to rotate. This application uses the positioning light on the stop lever to position the goods and the sling, preventing instability in the lifting center of gravity.

[0003] However, in actual use, the electric hoist may experience a problem of the steel cable being pulled at an angle due to the deviation between the position of the overhead crane and the actual hoisting position, which can easily lead to safety accidents. Utility Model Content

[0004] The purpose of this utility model is to provide an electric hoist with limit protection function, which solves the problem of conventional electric hoists lacking a detection structure when the steel rope is pulled at an angle.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model provides an electric hoist with limit protection function, including a winch body, a slide seat disposed below the winch body via a connecting seat, a slider adaptively slidably disposed on the slide seat, and a photoelectric sensor for detecting the position of the slider relative to the slide seat; The slide block is a frame structure with limiting grooves on its two opposite side walls. The slider is a disc structure that is limited and set in the limiting groove. A hollow sleeve is provided in the axial direction of the slider. The steel rope on the winch body passes through the hollow sleeve and extends downward. The photoelectric sensor includes a photoelectric signal transmitter disposed at one end of the outer wall of the slide and a photoelectric signal receiver disposed at the other end of the outer wall of the slide.

[0006] Furthermore, in this embodiment, the width of the limiting groove is not less than the thickness of the slider.

[0007] Furthermore in this embodiment, a ball bearing groove is provided in the limiting groove, and a ball bearing is adapted to be installed in the ball bearing groove.

[0008] Furthermore, in this embodiment, annular tracks adapted to the ball bearings are respectively provided on the top surface and bottom wall of the slider.

[0009] Furthermore, in this embodiment, the area between the outer wall of the hollow sleeve and the inner wall of the slide block is the correction detection range of the photoelectric sensor.

[0010] Furthermore in this embodiment, the inner diameter of the hollow sleeve is larger than the outer diameter of the steel rope.

[0011] Furthermore, in this embodiment, photoelectric sensors are respectively provided on both sides of the slide.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows: In this invention, a hollow sleeve drives the disc of the slider to slide within the limiting groove. The disc structure of the slider protrudes outward from the limiting groove, thus blocking the photoelectric sensor. Based on this, the photoelectric sensor detects that the range of motion of the steel rope exceeds its set threshold, and sends a signal to the controller, which then controls the winch body to cut off power or switch to lowering the steel rope, thereby ensuring safe hoisting operations. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the main structure of the electric hoist with limit protection function according to this utility model; Figure 2 This is a schematic diagram of the anti-slant pull detection component on the electric hoist with limit protection function according to this utility model; Figure 3 for Figure 2 Top view of the cross-section; Figure 4 for Figure 2 Schematic diagram of the middle slider; Figure 5 This is a schematic diagram of the cross-section of section 4; Figure 6 A schematic diagram showing the position of the slider and slide block on the anti-slant detection component; Figure 7 This is a schematic diagram showing the position of the slider and slide block on the anti-slant detection component.

[0015] Explanation of reference numerals in the attached drawings: 1. Winch body; 11. Steel rope; 2. Connecting seat; 3. Slide seat; 31. Limiting groove; 311. Ball bearing groove; 4. Sliding block; 41. Hollow sleeve; 42. Circular track; 421. Ball bearing; 5. Photoelectric sensor; 51. Photoelectric receiving component. Detailed Implementation

[0016] refer to Figure 1 and Figure 2 This embodiment discloses an electric hoist with limit protection function, including a winch body 1, a slide 3 installed below the winch body 1 via a connecting seat 2, a slider 4 adaptively slidably installed on the slide 3, and a photoelectric sensor 5 for detecting the position of the slider 4 relative to the slide 3.

[0017] In specific implementation, the slide block 3 is a frame structure and is parallel to the steel rope drum of the winch body 1. Limiting grooves 31 are formed on the two opposite side walls of the slide block 3. The slider 4 is a disc structure that is limited and installed in the limiting grooves 31. A hollow sleeve 41 is coaxially installed on the slider 4. The steel rope 11 on the winch body 1 passes through the hollow sleeve 41 and extends downward. The inner diameter of the hollow sleeve 41 is larger than the outer diameter of the steel rope 11 as a redundancy design for the movement of the steel rope 11 to avoid frequent triggering of shutdown. The photoelectric sensor 5 includes a photoelectric signal transmitter installed at one end of the outer wall of the slide block 3 and a photoelectric signal receiver installed at the other end of the outer wall of the slide block 3.

[0018] In use, when the steel rope 11 deviates, the hollow sleeve 41 drives the disc of the slider 4 to slide within the limiting groove 31. The disc structure of the slider 4 protrudes from the outside of the limiting groove 31, thus blocking the photoelectric sensor 5. Based on this, the photoelectric sensor 5 detects that the range of motion of the steel rope 11 exceeds its set threshold, and sends a signal to the controller, which then controls the winch body 1 to cut off power or switch to lowering the steel rope, or triggers the alarm.

[0019] In this embodiment, the width of the limiting groove 31 is not less than the thickness of the slider 4, and a redundant spacing is specifically designed so that the slider 4 directly forms sliding friction with the inner wall of the limiting groove 31.

[0020] Adoption of test Figures 3 to 5In this embodiment, a ball bearing groove 311 is provided in the limiting groove 31, and a ball bearing 421 is adapted to be installed in the ball bearing groove 311; annular tracks 42 adapted to the ball bearing 421 are respectively provided on the top surface and bottom wall of the slider 4; wherein the ball bearing 421 and the limiting track are installed on the end face of the slider 4 that is close to each other in the limiting groove 31, so as to realize the sliding rolling contact between the slider 4 and the inner wall of the limiting groove 31, thereby facilitating the sensitive adjustment of the limiting position of the slider 4.

[0021] In this embodiment, the area between the outer wall of the hollow sleeve 41 and the inner wall of the slide block 3 is the correction detection range of the photoelectric sensor 5; wherein the photoelectric sensor 5 further includes a photoelectric receiving component 51, which can be a photoelectric signal receiver.

[0022] refer to Figure 6 and Figure 7 The photoelectric sensors 5 are respectively installed on the two side walls of the slide block 3, so as to detect whether the sliding position of the slider 4 along the width direction of the slide block 3 exceeds the set threshold.

[0023] As another implementation, two parallel slide blocks 3 with a height difference can be installed below the winch body 1 via the connecting seat 2; the two slide blocks 3 have the same structure, and the position of the slider 4 on the slide block 3 can be detected by the photoelectric sensors 5 at different height positions, so as to determine whether the sliding position of the slider 4 along the length direction of the slide block 3 exceeds the set threshold.

[0024] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An electric hoist with limit protection function, characterized in that: Includes a winch body (1), a slide (3) disposed below the winch body (1) via a connecting seat (2), a slider (4) adaptively slidably disposed on the slide (3), and a photoelectric sensor (5) for detecting the position of the slider (4) relative to the slide (3); The slide block (3) is a frame structure with a limiting groove (31) on its two opposite side walls. The slider (4) is a disc structure that is limited in the limiting groove (31). A hollow sleeve (41) is provided in the axial direction of the slider (4). The steel rope (11) on the winch body (1) passes through the hollow sleeve (41) and extends downward. The photoelectric sensor (5) includes a photoelectric signal transmitter disposed at one end of the outer wall of the slide (3) and a photoelectric signal receiver disposed at the other end of the outer wall of the slide (3).

2. The electric hoist with limit protection function according to claim 1, characterized in that: The width of the limiting groove (31) is not less than the thickness of the slider (4).

3. The electric hoist with limit protection function according to claim 1, characterized in that: A ball groove (311) is provided in the limiting groove (31), and a ball (421) is adapted to be installed in the ball groove (311).

4. The electric hoist with limit protection function according to claim 3, characterized in that: The top and bottom surfaces of the slider (4) are respectively provided with annular tracks (42) adapted to the ball (421).

5. The electric hoist with limit protection function according to claim 1, characterized in that: The area between the outer wall of the hollow sleeve (41) and the inner wall of the slide (3) is the correction detection range of the photoelectric sensor (5).

6. The electric hoist with limit protection function according to claim 5, characterized in that: The inner diameter of the hollow sleeve (41) is larger than the outer diameter of the steel rope (11).

7. The electric hoist with limit protection function according to claim 1, characterized in that: The photoelectric sensors (5) are respectively provided on both sides of the slide (3).

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