High-altitude operation device and safety protection device thereof

Abstract

The utility model discloses a high-altitude operation device and a safety protection device thereof, and relates to the technical field of arm type high-altitude operation platforms, the safety protection device comprises a first mounting support, a second mounting support, a third mounting support and a fourth mounting support, the first mounting support is provided with a rotatable rotating rod, a first positioning pin and a detection switch, the first positioning pin is used for limiting the swinging position of the rotating rod, and the detection switch is used for detecting the position of the rotating rod; the second mounting support is provided with a ratchet swing rod rotating in one direction, a retaining clamping plate used for clamping a gear of the ratchet swing rod rotating in the reverse direction and an elastic piece, one end of the elastic piece is connected with the retaining clamping plate, and the other end of the elastic piece is arranged on the second mounting support so as to tension the retaining clamping plate; two ends of the pressing rod are respectively arranged at the top of the rotating rod and the top of the ratchet oscillating rod; and the detection switch is connected with the control device so as to cut off a power supply of the aerial work platform when the detection switch does not detect the rotating rod. The device can protect the safety of operators on the aerial work platform in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of arm-type aerial work platforms, and more specifically, to a safety protection device and an aerial work device comprising the safety protection device. Background Art

[0002] When the boom of a boom-type aerial work platform is extended or retracted, the operator faces the operating console. When the boom is extended upward, the operator cannot check the structure above the head in time, which may cause the body to be squeezed. In the existing technology, the high-altitude guard technology is to add a steel wire rope above the operating box. One end of the steel wire rope is fixed, and the other end is connected to a magnet. A proximity switch is used to detect the side where the magnet is attracted. When the operator is squeezed, they will touch the steel wire rope, causing the magnet to detach. The proximity switch cannot detect the magnet, and the system will determine that the safety guard is disconnected, which will cut off the control of the upper control box, thereby stopping the boom movement and protecting the operator from being squeezed.

[0003] However, the disadvantage of this technical solution is that if the wire rope is cut, the magnet at the end of the wire rope will not be out of the detection of the proximity switch, and the system will always determine that the device is not disconnected, and it will not play a protective role. That is, after the wire rope is cut, the magnet at the end of the wire rope is returned to its original position, which can keep the safety guard in a safe state. Even if someone is squeezed, the power supply and action of the upper control box will not be cut off, and it will not play a protective role.

[0004] In summary, how to prevent the operator from manually blocking the security guard, thereby protecting the operator's safety on the work platform in real time, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a safety protection device that prevents the operator from manually shielding the detection signal of the detection switch, thereby protecting the operator's safety on the aerial work platform in real time. Another purpose of the present invention is to provide an aerial work device including the above-mentioned safety protection device.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A safety protection device, comprising:

[0008] a first mounting support, which is provided on one side of the aerial work platform, the first mounting support being provided with a rotatable rotating rod, a first positioning pin for limiting the swing position of the rotating rod, and a detection switch for detecting the position of the rotating rod;

[0009] a second mounting support, which is provided on the other side of the aerial work platform, and is provided with a unidirectionally rotating ratchet swing lever, a rotatable backstop plate for clamping the gear of the reversely rotating ratchet swing lever, and an elastic member, one end of the elastic member is connected to the backstop plate, and the other end of the elastic member is provided on the second mounting support to tighten the backstop plate;

[0010] a pressure rod, the two ends of which are respectively arranged at the top of the rotating rod and the top of the ratchet swing rod;

[0011] The control device is connected to the detection switch to cut off the power supply of the aerial work platform when the detection switch does not detect the rotating rod.

[0012] In one embodiment, the top of the rotating rod and the top of the ratchet swing rod are both provided with a perforated channel for passing the pressure rod, and the end of the pressure rod is fixed to the perforated channel by a second positioning pin.

[0013] In one embodiment, the anti-retraction clamping plate and the second mounting support are distributed in parallel, and the end of the anti-retraction clamping plate is rotatably mounted in the mounting shaft hole of the second mounting support via a connecting shaft.

[0014] In one embodiment, the connecting shaft is locked on the second mounting support by a third positioning pin.

[0015] In one embodiment, one end of the elastic member is disposed on a mounting post of the second mounting support, and the mounting post is located below the gear;

[0016] The other end of the elastic member is arranged on the convex column of the anti-retraction card plate. The anti-retraction card plate is located above the gear. The anti-retraction card plate is provided with a triangular protrusion for engaging with the gear.

[0017] In one embodiment, the elastic member includes a gas spring structure or a compression spring structure.

[0018] In one embodiment, the detection switch includes a proximity switch or a travel switch.

[0019] An aerial work device comprises: an aerial work platform and any one of the above-mentioned safety protection devices.

[0020] The beneficial effect of the present invention is that when the safety protection device provided by the present invention is used, the first mounting bracket and the second mounting bracket are both fixed to the aerial work platform, the rotating rod can rotate relative to the first mounting bracket, the ratchet swing rod can rotate relative to the second mounting bracket, and the two ends of the pressure rod are respectively disposed at the top of the rotating rod and the top of the ratchet swing rod. Finally, the rotating rod, the pressure rod, and the ratchet swing rod are connected as a whole and rotate together around the first mounting bracket and the second mounting bracket. One end of the anti-recoil clamp can rotate around the second mounting bracket, one end of the elastic member is hung on the anti-recoil clamp, and the other end of the elastic member is hung on the second mounting bracket. The elastic member is stretched so that the other end of the anti-recoil clamp can engage the gear of the ratchet swing rod that rotates in the opposite direction. That is, when the gear rotates in the opposite direction, the entire connection of the rotating rod, the pressure rod, and the ratchet swing rod is locked by the anti-recoil clamp, and the entire connection of the rotating rod, the pressure rod, and the ratchet swing rod can only rotate in one direction and is not allowed to rotate in the opposite direction.

[0021] When the operator is squeezed and tilted forward, their body presses against the pressure lever, which drives both the rotating lever and the ratchet lever forward (in the direction in which the ratchet lever's gear can rotate in one direction). The anti-return clip does not prevent the gears from rotating. If the detection switch fails to detect the rotating lever and transmits this information to the control unit, the control unit determines that the operator is being squeezed and immediately shuts off the power to the aerial work platform, stopping the equipment and fixing its position relative to the obstacle behind it. The operator can continue to lean forward to avoid injury from the crushing. At this point, the control box on the aerial work platform becomes inoperable, requiring ground personnel to verify the safety of the operator on the aerial work platform and move the platform to a safe position. Simultaneously, the pressure lever, under the clamping force of the anti-return clip and the preloaded elastic force of the elastic member, engages the ratchet lever's gear, preventing reverse rotation and preventing the pressure lever from automatically returning to its original position. The operator must lift the anti-return clip and return the pressure lever to its original position.

[0022] This device replaces the existing wire rope with a compression rod. The detection switch's detection signal is closely linked to the rod's position, allowing the control device to quickly detect the signal and determine whether the operator is being squeezed. If so, the power to the aerial work platform is immediately cut off; otherwise, no power is cut off. The operator cannot manually block the detection switch's signal (i.e., they cannot block the detection signal by cutting the wire rope), ensuring the safety of the safety guard and protecting the operator's safety on the aerial work platform in real time.

[0023] In summary, the safety protection device provided by the present invention prevents the operator from manually shielding the detection signal of the detection switch, thereby protecting the operator's operating safety on the aerial work platform in real time.

[0024] In addition, the utility model also provides an aerial work device including the above-mentioned safety protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of the structure of the aerial work device provided by the utility model;

[0027] Figure 2 for Figure 1 Side view of;

[0028] Figure 3 A schematic diagram of the structure of the safety protection device provided by the utility model;

[0029] Figure 4 for Figure 3 A top view of

[0030] Figure 5 for Figure 3 Side view of;

[0031] Figure 6 for Figure 3 Side view in the middle AA direction;

[0032] Figure 7 for Figure 3 Side view in the middle BB direction;

[0033] Figure 8 It is a structural diagram of the ratchet swing lever, the anti-retraction clamping plate and the elastic member.

[0034] Reference numerals:

[0035] 1-first mounting support; 2-rotating rod; 3-pressure rod; 4-ratchet swing rod; 5-second mounting support; 6-second positioning pin; 7-first positioning pin; 8-detection switch; 9-retraction plate; 10-elastic member; 11-aerial work platform; 12-third positioning pin; 13-mounting column; 14-convex column; 15-connecting shaft. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The core of the present invention is to provide a safety protection device that prevents operators from manually shielding the detection signal of the detection switch, thereby protecting the operator's safety in real time while operating on an aerial work platform. Another core of the present invention is to provide an aerial work device including the above-mentioned safety protection device.

[0038] Please refer to Figures 1 to 8 , Figure 1 A schematic diagram of the structure of the aerial work device provided by the utility model; Figure 2 for Figure 1 Side view of; Figure 3 A schematic diagram of the structure of the safety protection device provided by the utility model; Figure 4 for Figure 3 A top view of Figure 5 for Figure 3 Side view of; Figure 6 for Figure 3 Side view in the middle AA direction; Figure 7 for Figure 3 Side view in the middle BB direction; Figure 8 It is a structural diagram of the ratchet swing lever, the anti-retraction clamping plate and the elastic member.

[0039] This specific embodiment provides a safety protection device, including:

[0040] A first mounting support 1 is provided on one side of the aerial work platform 11 and is provided with a rotatable rotating rod 2, a first positioning pin 7 for limiting the swing position of the rotating rod 2, and a detection switch 8 for detecting the position of the rotating rod 2;

[0041] The second mounting bracket 5 is provided on the other side of the aerial work platform 11. The second mounting bracket 5 is provided with a unidirectionally rotating ratchet swing lever 4, a backstop plate 9 for clamping the gear of the reversely rotating ratchet swing lever 4, and an elastic member 10. One end of the elastic member 10 is connected to the backstop plate 9, and the other end of the elastic member 10 is provided on the second mounting bracket 5 to tighten the backstop plate 9.

[0042] A pressure rod 3, whose two ends are respectively arranged at the top of the rotating rod 2 and the top of the ratchet swing rod 4;

[0043] The control device, the detection switch 8 and the control device are connected to cut off the power supply of the aerial work platform 11 when the detection switch 8 does not detect the rotating rod 2.

[0044] It should be noted that the control device is used to cut off the power supply of the aerial work platform 11 when the detection switch 8 does not detect the rotating rod 2, which is equivalent to the protection function of the safety guard of the aerial work platform 11. A base plate can be set at the bottom of the first mounting support 1 and the second mounting support 5. The base plate and the guardrail of the aerial work platform 11 are placed in close proximity and fixed to the guardrail with bolts. Moreover, the base plate and the vertically distributed first mounting support 1 are an integrated structure, and the base plate and the vertically distributed second mounting support 5 are also an integrated structure. In addition, an assembly hole for rotatably mounting the rotating rod 2 can be set on the first mounting support 1, and an assembly hole for rotatably mounting the ratchet swing rod 4 can be set on the second mounting support 5, so that the rotating rod 2 and the ratchet swing rod 4 can be rotatable.

[0045] It should also be noted that the bottom pipe of the rotating rod 2 (the bottom pipe and the rotating rod 2 are arranged in a hook shape) is inserted into the assembly hole of the first mounting support 1, and the rotating rod 2 is laterally limited by the first positioning pin 7 and its own welding plate, so that the rotating rod 2 can rotate around the assembly hole; the bottom pipe of the ratchet swing rod 4 (the bottom pipe and the ratchet swing rod 4 are arranged in a hook shape) is inserted into the assembly hole of the second mounting support 5, and the ratchet swing rod 4 can also be laterally limited by the first positioning pin 7 and its own welding plate, so that the ratchet swing rod 4 can rotate around the assembly hole.

[0046] During actual use, the shape, structure, size, material, position, etc. of the first mounting support 1, the second mounting support 5, the pressure rod 3 and the control device can be determined according to actual conditions and actual needs.

[0047] When using the safety protection device provided by the present invention, the first mounting bracket 1 and the second mounting bracket 5 are both fixed to the aerial work platform 11, the rotating rod 2 can rotate relative to the first mounting bracket 1, the ratchet swing rod 4 can rotate relative to the second mounting bracket 5, and the two ends of the pressure rod 3 are respectively arranged at the top of the rotating rod 2 and the top of the ratchet swing rod 4. Finally, the rotating rod 2, the pressure rod 3 and the ratchet swing rod 4 are connected as a whole and rotate together around the first mounting bracket 1 and the second mounting bracket 5. One end of the anti-retraction clamp 9 can rotate around the second mounting bracket 5, one end of the elastic member 10 is hung on the anti-retraction clamp 9, and the other end of the elastic member 10 is hung on the second mounting bracket 5. The elastic member 10 is stretched so that the other end of the anti-retraction clamp 9 can clamp the gear of the ratchet swing rod 4 that rotates in the opposite direction. That is, when the gear rotates in the reverse direction, the whole connected by the rotating rod 2, the pressure rod 3 and the ratchet swing rod 4 is locked by the anti-retraction card 9, and the whole connected by the rotating rod 2, the pressure rod 3 and the ratchet swing rod 4 can only rotate in one direction and is not allowed to rotate in the reverse direction.

[0048] When the operator is squeezed and falls forward, their body presses against the pressure rod 3, which drives the rotating rod 2 and the ratchet swing rod 4 to rotate forward together (i.e., the direction in which the gear of the ratchet swing rod 4 can rotate in one direction). At this time, the anti-retraction clamp 9 will not prevent the rotation of the gear. When the detection switch 8 cannot detect the rotating rod 2, and the detection switch 8 can transmit the detection information to the control device, the control device determines that the operator is squeezed and immediately cuts off the power supply of the aerial work platform 11. The equipment stops operation and the relative position of the equipment and the rear obstacle is fixed. The operator continues to lean forward to avoid being squeezed. At this time, the control box on the aerial work platform 11 is ineffective. The safety of the operator on the aerial work platform 11 must be verified by ground personnel and the ground control platform must be moved to a safe position. At the same time, the pressure rod 3 is clamped by the clamping force of the anti-retraction clamp 9 and the pre-tightening elastic force of the elastic part 10 to prevent the gear from rotating in the opposite direction and the pressure rod 3 from automatically resetting. The operator needs to lift the anti-retraction clamp 9 after safety to push the pressure rod 3 back to its initial position to prevent secondary injury.

[0049] This device replaces the existing wire rope with a compression rod 3. The detection signal from the detection switch 8 is closely related to the position of the compression rod 3. This allows the control device to quickly obtain the detection signal and determine whether the operator is being squeezed. If so, the power to the aerial work platform 11 is immediately cut off; otherwise, no power cut is required. The operator cannot manually block the detection signal from the detection switch 8 (i.e., they cannot block the detection signal by cutting the wire rope), ensuring the accuracy of the safety guard and protecting the operator's safety while operating the aerial work platform 11.

[0050] In summary, the safety protection device provided by the present invention prevents the operator from manually shielding the detection signal of the detection switch 8 , thereby protecting the operator's operating safety on the aerial work platform 11 in real time.

[0051] In one embodiment, Figure 3 、 Figure 5 As shown, the top of the rotating rod 2 and the top of the ratchet swing rod 4 are both provided with a through-hole channel for passing the pressure rod 3, and the end of the pressure rod 3 is fixed to the through-hole channel by a second positioning pin 6 to limit the lateral displacement of the pressure rod 3 by the second positioning pin 6. The pressure rod 3 connects the rotating rod 2 and the ratchet swing rod 4 into a whole, and rotates together around the assembly holes of the first mounting support 1 and the second mounting support 5.

[0052] In one embodiment, the anti-recoil clip 9 and the second mounting bracket 5 are distributed in parallel, and the end of the anti-recoil clip 9 is rotatably mounted in the mounting shaft hole of the second mounting bracket 5 via a connecting shaft 15. Therefore, the anti-recoil clip 9 can rotate around the mounting shaft hole of the second mounting bracket 5.

[0053] In one embodiment, the connecting shaft 15 is locked to the second mounting bracket 5 by the third positioning pin 12. That is, the end of the anti-retraction clamp 9 is mounted to the mounting shaft hole of the second mounting bracket 5 through the connecting shaft 15, and the end of the connecting shaft 15 is locked to the second mounting bracket 5 by the third positioning pin 12, so that the anti-retraction clamp 9 is positioned laterally by the third positioning pin 12, so that the flipping of the anti-retraction clamp 9 is restricted.

[0054] In one embodiment, Figure 6 、 Figure 8 As shown, one end of the elastic member 10 is provided on the mounting column 13 of the second mounting support 5, and the mounting column 13 is located below the gear; the other end of the elastic member 10 is provided on the protruding column 14 of the anti-retraction clamp 9, and the anti-retraction clamp 9 is located above the gear, and the anti-retraction clamp 9 is provided with a triangular protrusion for engaging with the gear.

[0055] It should be noted that the elastic member 10 is stretched, causing the triangular protrusion of the anti-retraction clamp 9 to face the gear of the ratchet swing lever 4 (i.e., the ratchet). The entire connection of the pressure lever 3, the rotating lever 2, and the ratchet swing lever 4 is locked by the anti-retraction clamp 9, allowing the entire connection of the pressure lever 3, the rotating lever 2, and the ratchet swing lever 4 to rotate counterclockwise (forward), but not clockwise (backward). This device replaces the original safety protection device with a wire rope plus a magnetic structure and adopts a safety protection device with a special structure of a ratchet swing lever 4 plus an elastic member 10. Therefore, when the pressure lever 3 no longer rotates forward, the pressure lever 3 can be stuck to the gear of the ratchet swing lever 4 under the action of the anti-retraction clamp 9 and the elastic member 10, so that the pressure lever 3 cannot automatically reset. The operator needs to lift the anti-retraction clamp 9 and return the pressure lever 3 to its initial position.

[0056] In one embodiment, the elastic member 10 includes a gas spring structure or a compression spring structure.

[0057] It should be noted that a gas spring structure is a compression gas spring, and a compression spring structure is a mechanical spring. A gas spring structure requires pre-tightening to achieve the desired holding pressure, and this holding pressure increases significantly with increasing stroke. This holding pressure is not constant and may prevent the part from forming, which is very undesirable for the drawing force. This situation often affects the quality of the stamped part, complicates the mold structure design, and reduces the time required to change the mold on the press. The gas spring structure has the advantages of relatively slow speed, little dynamic force change, and easy control. The compression spring structure, on the other hand, has the advantages of relatively small size, low cost, and relatively long life.

[0058] In one embodiment, the detection switch 8 includes a proximity switch or a travel switch.

[0059] It's important to note that a travel switch, also known as a position switch (also known as a limit switch), is a commonly used low-current master electrical device. It utilizes the collision of mechanical moving parts to activate its contacts, connecting or disconnecting a control circuit to achieve a specific control objective. Typically, this type of travel switch is used to limit the position or travel of mechanical movement, enabling it to automatically stop, reverse, change speed, or automatically reciprocate at a specific position or travel.

[0060] It should also be noted that proximity switches, also known as contactless travel switches, not only provide travel control and limit protection but are also non-contact detection devices used to detect part size and speed. They can also be used in variable frequency counters, variable frequency pulse generators, liquid level control, and automatic connection of machining programs. Characteristics of proximity switches include reliable operation, long life, low power consumption, high reset accuracy, high operating frequency, and adaptability to harsh working environments.

[0061] In addition to the above-mentioned safety protection device, the present invention also provides an aerial work device including the safety protection device disclosed in the above-mentioned embodiment and the aerial work platform 11. For the structures of other parts of the aerial work device, please refer to the prior art and will not be described in detail herein.

[0062] It should be noted that the first mounting bracket 1 and the second mounting bracket 5, the first positioning pin 7 and the second positioning pin 6 and the third positioning pin 12 mentioned in the present invention, where the first, second and third are only used to distinguish the different positions, and there is no order of precedence.

[0063] In addition, it should be noted that the orientation or position relationship indicated by "up and down" etc. in the present invention is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description and facilitating understanding, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by this utility model is within the scope of protection of this utility model and will not be described in detail here.

[0065] The above describes in detail the aerial work device and its safety protection device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, various improvements and modifications can be made to the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A safety protection device, characterized in that: include: A first mounting support (1) is provided on one side of the aerial work platform (11), wherein the first mounting support (1) is provided with a rotatable rotating rod (2), a first positioning pin (7) for limiting the swing position of the rotating rod (2), and a detection switch (8) for detecting the position of the rotating rod (2); a second mounting support (5) provided on the other side of the aerial work platform (11), the second mounting support (5) being provided with a unidirectionally rotating ratchet swing lever (4), a rotatable backstop plate (9) for clamping a gear of the reversely rotating ratchet swing lever (4), and an elastic member (10), one end of the elastic member (10) being connected to the backstop plate (9), and the other end of the elastic member (10) being provided on the second mounting support (5) to tighten the backstop plate (9); A pressure rod (3), two ends of which are respectively arranged at the top of the rotating rod (2) and the top of the ratchet swing rod (4); A control device is provided, wherein the detection switch (8) is connected to the control device so as to cut off the power supply of the aerial work platform (11) when the detection switch (8) fails to detect the rotating rod (2).

2. The safety protection device according to claim 1, characterized in that: The top of the rotating rod (2) and the top of the ratchet swing rod (4) are both provided with a perforated channel for passing the pressure rod (3), and the end of the pressure rod (3) is fixed to the perforated channel via a second positioning pin (6).

3. The safety protection device according to claim 1, characterized in that: The anti-retraction clamping plate (9) and the second mounting support (5) are distributed in parallel, and the end of the anti-retraction clamping plate (9) is rotatably mounted in the mounting shaft hole of the second mounting support (5) via a connecting shaft (15).

4. The safety protection device according to claim 3, characterized in that: The connecting shaft (15) is locked on the second mounting support (5) via a third positioning pin (12).

5. The safety protection device according to claim 4, characterized in that: One end of the elastic member (10) is arranged on a mounting post (13) of the second mounting support (5), and the mounting post (13) is located below the gear; The other end of the elastic member (10) is arranged on the protruding column (14) of the anti-retraction card (9), and the anti-retraction card (9) is located above the gear. The anti-retraction card (9) is provided with a triangular protrusion for meshing with the gear.

6. The safety protection device according to any one of claims 1 to 5, characterized in that: The elastic member (10) comprises a gas spring structure or a compression spring structure.

7. The safety protection device according to any one of claims 1 to 5, characterized in that: The detection switch (8) includes a proximity switch or a travel switch.

8. A high-altitude working device, characterized in that: include: Aerial work platform (11) and the safety protection device according to any one of claims 1 to 7 above.

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