Cover plate type fork tip safety device

Abstract

The utility model relates to the technical field of forklifts, and discloses a cover plate type pallet fork tip safety device which comprises a top plate and a bottom plate, the top plate is movably connected with the bottom plate, a fork tip is arranged at one end of the inner bottom of the bottom plate, and a rotary connecting mechanism is arranged between the fork tip and the bottom plate. A springback reset mechanism is fixed to the lower surface of the top plate, a switch support is fixed to the position, located on one side of the springback reset mechanism, of the lower surface of the top plate, and a proximity switch is fixed to the interior of the switch support. According to the utility model, the obstacle detection in a non-contact manner and the obstacle detection in a mechanical collision manner can be carried out in parallel to detect the obstacle from the front, and the obstacle on the side surface can be detected through the swing type mechanical detection device, thereby providing more comprehensive and accurate surrounding environment perception capability for the AGV.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a cover plate type cargo fork tip safety device. Background Art

[0002] At present, in the field of AGV forklifts, in order to protect the safety of the fork tip and timely feedback the current fork tip status, the existing fork tip safety device usually adopts a single non-contact photoelectric sensor or ultrasonic sensor, but the photoelectric sensor and ultrasonic sensor are easily affected by the color and material of the object surface. In addition, the detection range of the photoelectric sensor and ultrasonic sensor is small and there is a large blind spot, so it is impossible to obtain stable and reliable detection results; some manufacturers use mechanical collision plus photoelectric sensor for joint detection, but its mechanical device can only detect obstacles in front. When the forklift turns, if the side of the fork tip is hit, it cannot avoid obstacles normally. The AGV cannot effectively detect the existence of obstacles, which may cause the goods on the fork to overturn or fall. It is necessary to solve the existing problems. For this purpose, a cover-type fork fork tip safety device is designed. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one purpose of the utility model is to propose a cover-type fork tip safety device, which can realize the non-contact method of detecting obstacles and the mechanical collision method of detecting obstacles in parallel to detect obstacles from the front, and can detect side obstacles through a swing-type mechanical detection device, providing AGV with a more comprehensive and accurate surrounding environment perception capability.

[0004] According to the cover plate type cargo fork fork tip safety device proposed by the utility model, it comprises a top plate and a bottom plate, the top plate and the bottom plate are movably connected, a fork tip is arranged at one end of the inner bottom of the bottom plate, a rotating connection mechanism is arranged between the fork tip and the bottom plate, a rebound reset mechanism is fixed on the lower surface of the top plate, a switch bracket is fixed on the lower surface of the top plate and on one side of the rebound reset mechanism, and a proximity switch is fixed inside the switch bracket;

[0005] The fork tip includes a collision member movably mounted on the bottom of the bottom plate, a photoelectric sensor is fixed inside the collision member, an external threaded bearing is fixedly and symmetrically mounted on one end of the collision member away from the photoelectric sensor, and at least one of the external threaded bearings is in contact with the rebound reset mechanism;

[0006] The rebound reset mechanism includes a linear bearing fixed on the lower surface of the top plate, an optical axis is movably installed inside the linear bearing, collision trigger plates are symmetrically fixed at both ends of the optical axis, and a reset spring is mounted on the surface of the optical axis and at one end close to the fork tip.

[0007] Preferably, the rotary connection mechanism comprises a pin penetrating the base plate and the collision member, a movable bearing is movably sleeved between the surface of the pin and the collision member, and a stop nut is threadedly mounted on one end of the pin extending below the collision member.

[0008] Preferably, a fitting hole for fitting the pin is provided on the surface of the bottom plate, and a mounting hole for installing the movable bearing is provided on the surface of the collision member.

[0009] Preferably, the side walls of the bottom plate are symmetrically fixed with limit plates and guide rails, the lower surface of the top plate and the two sides of the rebound reset mechanism are symmetrically fixed with sliders, and the guide rails on the same side are movably connected to the sliders.

[0010] Preferably, the proximity switch is located between the collision triggering plates.

[0011] The beneficial effects of the present invention are:

[0012] 1. Both non-contact obstacle detection and contact obstacle detection can be performed. The two work independently and cooperate with each other to realize the safety protection function of the fork tip front.

[0013] 2. The use of a rotating fork tip can effectively detect collisions from the side, further increasing the safety of the fork tip. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a schematic diagram of the overall structure of the cover plate type cargo fork tip safety device.

[0015] Figure 2 This is an exploded view of the overall structure of the cover plate type fork tip safety device proposed by the utility model.

[0016] Figure 3 This is a schematic diagram of the top plate installation structure of the cover plate type fork tip safety device proposed by the utility model.

[0017] Figure 4 The utility model provides a schematic diagram of the fork tip collision of the cover plate type cargo fork fork tip safety device.

[0018] Figure 5 The utility model discloses a schematic diagram of the rebound reset mechanism of the cover plate type cargo fork tip safety device.

[0019] Figure 6 It is a schematic diagram of the rotary connection mechanism of the cover plate type cargo fork tip safety device proposed by the utility model.

[0020] In the figure: 1. top plate; 2. fork tip; 21. collision member; 22. external threaded bearing; 23. photoelectric sensor; 3. rebound reset mechanism; 31. collision trigger plate; 32. optical axis; 33. linear bearing; 34. reset spring; 41. slider; 42. guide rail; 5. limit plate; 6. bottom plate; 71. switch bracket; 72. proximity switch; 8. rotating connection mechanism; 81. pin; 82. movable bearing; 83. stop nut. DETAILED DESCRIPTION

[0021] Reference Figure 1-6 , a cover-type fork tip safety device comprises a top plate 1 and a bottom plate 6, the top plate 1 and the bottom plate 6 are movably connected, a fork tip 2 is arranged at one end of the inner bottom of the bottom plate 6, a rotating connection mechanism 8 is arranged between the fork tip 2 and the bottom plate 6, a rebound reset mechanism 3 is fixed to the lower surface of the top plate 1, a switch bracket 71 is fixed to the lower surface of the top plate 1 and located on one side of the rebound reset mechanism 3, and a proximity switch 72 is fixed inside the switch bracket 71;

[0022] The fork tip 2 includes a collision member 21 movably mounted on the bottom of the bottom plate 6, a photoelectric sensor 23 is fixed inside the collision member 21, and an external threaded bearing 22 is fixedly and symmetrically mounted on one end of the collision member 21 away from the photoelectric sensor 23, and at least one external threaded bearing 22 is in contact with the rebound reset mechanism 3;

[0023] The rebound reset mechanism 3 includes a linear bearing 33 fixed on the lower surface of the top plate 1, an optical axis 32 is movably installed inside the linear bearing 33, collision trigger plates 31 are symmetrically fixed at both ends of the optical axis 32, and a reset spring 34 is mounted on the surface of the optical axis 32 and at one end close to the fork tip 2. When the forklift is separated from the obstacle, the reset spring 34 drives the fork tip 2 to reset.

[0024] The rotating connection mechanism 8 includes a pin 81 penetrating the bottom plate 6 and the collision member 21 , a movable bearing 82 is movably mounted between the surface of the pin 81 and the collision member 21 , and a stop nut 83 is threadedly mounted on one end of the pin 81 extending below the collision member 21 .

[0025] A fitting hole for fitting the pin 81 is provided on the surface of the bottom plate 6 , and a mounting hole for installing the movable bearing 82 is provided on the surface of the collision member 21 .

[0026] The side walls of the bottom plate 6 are symmetrically fixed with limit plates 5 and guide rails 42; the lower surface of the top plate 1 and the two sides of the rebound reset mechanism 3 are symmetrically fixed with sliders 41; the guide rails 42 on the same side are movably docked with the sliders 41; the bottom plate 6 and the top plate 1 can move relatively; the limit plates 5 are used to limit the movement of the sliders 41 to the extreme position to prevent the top plate 1 and the bottom plate 6 from detaching.

[0027] The proximity switch 72 is located between the collision trigger plates 31. When the fork tip 2 collides and deflects, the external threaded bearing 22 deflects and squeezes the collision trigger plate 31 to move, thereby driving the optical axis 32 to move. During this process, the proximity switch 72 is triggered, indicating that the forklift collides with an obstacle while moving.

[0028] There are multiple detection scenarios when this device is used:

[0029] Non-contact detection

[0030] The photoelectric sensor 23 is installed in the fork tip 2, and the detection port of the photoelectric sensor 23 faces the front of the fork tip. If an obstacle appears in front of the fork tip when the AGV is reversing, the photoelectric sensor 23 detects the obstacle, and the system stops after obtaining the signal of the photoelectric sensor 23.

[0031] Front contact detection

[0032] The detection surface of the photoelectric sensor 23 is small, and there will be a certain detection blind area. If the front obstacle is not detected by the photoelectric sensor 23, it will collide with the fork tip 2. After the fork tip 2 is hit head-on, due to the guiding effect of the guide mechanism, the fork tip 2 drives the bottom plate 6 to move backward, and the external threaded bearing 22 on the fork tip 2 squeezes the collision trigger plate 31 at one end of the rebound reset mechanism 3, compresses the reset spring 34, and drives the collision trigger plate 31 at the other end away from the proximity switch 72. If the proximity switch 72 cannot detect the collision trigger plate 31, the signal changes, and the system stops after detecting the signal state of the proximity switch 72. After the obstacle is removed, the pressure on the collision member 21 disappears, and the reset spring 34 rebounds to drive the collision trigger plate 31 at one end of the reset spring 34 to move. The collision trigger plate 31 squeezes the two external threaded bearings 22 to drive the collision member 21 and the bottom plate 6 to move forward, and the collision trigger plate 31 at the other end approaches the proximity switch 72, and the mechanism returns to its initial state.

[0033] Side contact detection

[0034] When the forklift turns and the side of the fork tip is hit, the collision member 21 rotates after being hit, and the external threaded bearing 22 on one side of the collision member 21 squeezes the collision trigger plate 31 due to rotation. When the collision trigger plate 31 moves backward, it compresses the return spring 34 and drives the collision trigger plate 31 at the other end of the optical axis 32 away from the proximity switch 72 through the optical axis 32. If the proximity switch 72 cannot detect the collision trigger plate 31, the signal changes, and the system stops after detecting the signal state of the proximity switch 72. After the obstacle is removed, the pressure on the collision member 21 disappears, the return spring 34 rebounds and drives the collision trigger plate 31 at one end of the return spring 34 to move, and the collision trigger plate 31 presses against the external threaded bearing 22 to drive the collision member 21 to rotate and return to the middle position, and the collision trigger plate 31 at the other end approaches the proximity switch 72, and the mechanism returns to the initial state.

[0035] In order to prevent the structure from being damaged by a frontal collision due to excessive impact, the maximum width of the collision member 21 of the fork tip 2 is greater than the opening width of the fork tip. When the fork tip 2 is subjected to a large impact, the plates on both sides of the collision member 21 of the fork tip 2 will be blocked by the fork tip, preventing the fork tip 2 from further moving into the mechanism. Both the rebound reset mechanism 3 and the guide mechanism have a large margin of motion, thereby avoiding structural damage. At the same time, in order to prevent the structure from being damaged by a side collision due to excessive impact, the maximum rotation angle of the collision member 21 of the fork tip 2 is limited by the side wall of the fork tip opening. When the side of the fork tip 2 is subjected to a large impact, the other side of the fork tip 2 will be blocked by the side wall of the fork tip opening when it reaches the maximum angle. Prevent the fork tip 2 from further rotating and being damaged.

Claims

1. Cover plate type fork tip safety device, characterized by: It comprises a top plate and a bottom plate, the top plate and the bottom plate are movably connected, a fork tip is provided at one end of the inner bottom of the bottom plate, a rotation connection mechanism is provided between the fork tip and the bottom plate, a rebound reset mechanism is fixed on the lower surface of the top plate, a switch bracket is fixed on the lower surface of the top plate and on one side of the rebound reset mechanism, and a proximity switch is fixed inside the switch bracket; The fork tip includes a collision member movably mounted on the bottom of the bottom plate, a photoelectric sensor is fixed inside the collision member, an external threaded bearing is fixedly and symmetrically mounted on one end of the collision member away from the photoelectric sensor, and at least one of the external threaded bearings is in contact with the rebound reset mechanism; The rebound reset mechanism includes a linear bearing fixed on the lower surface of the top plate, an optical axis is movably installed inside the linear bearing, collision trigger plates are symmetrically fixed at both ends of the optical axis, and a reset spring is mounted on the surface of the optical axis and at one end close to the fork tip.

2. The cover-type fork tip safety device according to claim 1, characterized in that: The rotary connection mechanism comprises a pin penetrating the bottom plate and the collision member, a movable bearing is movably sleeved between the surface of the pin and the collision member, and a stop nut is threadedly mounted on one end of the pin extending below the collision member.

3. The cover plate type fork tip safety device according to claim 2, characterized in that: The surface of the bottom plate is provided with a fitting hole for fitting the pin, and the surface of the collision member is provided with a mounting hole for installing the movable bearing.

4. The cover plate type fork tip safety device according to claim 1, characterized in that: The side walls of the bottom plate are symmetrically fixed with limit plates and guide rails, and the lower surface of the top plate and the two sides of the rebound reset mechanism are symmetrically fixed with sliders, and the guide rails on the same side are movably connected with the sliders.

5. The cover plate type fork tip safety device according to claim 1, characterized in that: The proximity switch is located between the collision trigger plates.

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