Mechanical overload limiter and lifting device

Abstract

The mechanical overload limiter comprises a supporting plate, a bearing part is arranged above the supporting plate, one end of the bearing part is a rotary connecting end, the rotary connecting end is rotatably connected with the supporting plate, the other end of the bearing part is a pressing end, a plurality of elastic mechanisms are arranged between the pressing end and the supporting plate, a fixing seat is further arranged on the supporting plate, and the fixing seat is fixedly connected with the supporting plate. The fixing seat is rotatably connected with the lever, one end of the lever corresponds to a pressing rod arranged on the bottom face of the downward pressing end of the bearing plate, the other end of the lever corresponds to the mechanical precision switch, the mechanical precision switch is fixed to the supporting plate through the switch support, and the overload limiter can stably work under the radiation condition.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting limiters, in particular to a mechanical overload limiter and a lifting device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] With the development of economy and technology, the research and application of radioactive materials have developed rapidly. During the research and application process, materials are transported by lifting devices, such as electric hoists or open winches. According to current regulations, lifting devices must be equipped with overload limiters. Currently, the overload limiters equipped on lifting devices for different occasions are all electronic and cannot work stably in a radioactive environment, which limits the application of cranes in the handling of radioactive materials. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide a mechanical overload limiter and a lifting device, which are purely mechanical structures and avoid the phenomenon of being unable to work stably in a radioactive environment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect, an embodiment of the utility model provides a mechanical overload limiter, including a support plate, a bearing member is arranged above the support plate, one end of the bearing member is a rotating connection end, the rotating connection end is rotatably connected to the support plate, and the other end serves as a downward pressure end, and a plurality of elastic mechanisms are arranged between the downward pressure end and the support plate. A fixed seat is also arranged on the support plate, and the fixed seat is rotatably connected to a lever, one end of the lever corresponds to a pressure rod arranged on the bottom surface of the downward pressure end of the bearing plate, and the other end corresponds to a mechanical precision switch, and the mechanical precision switch is fixed to the support plate through a switch bracket.

[0007] Optionally, the bearing member includes two rotating rods, the rotating connecting ends of the rotating rods are rotatably connected to hinge seats arranged on the support plate, the pressing ends of the rotating rods are provided with a lower pressing plate, and a plurality of elastic mechanisms are provided between the lower pressing plate and the support plate.

[0008] Optionally, an elastic mechanism is provided between the two ends of the lower pressing plate and the supporting plate.

[0009] Optionally, the elastic mechanism includes a lower pressure shaft, which is provided with an annular boss, the shaft section of the lower pressure shaft above the annular boss extends into a through hole provided in the supporting member, the bottom surface of the supporting member contacts the upper surface of the annular boss, the shaft section of the lower pressure shaft below the annular boss passes through the sleeve and the support plate in sequence, the bottom end of the sleeve is fixed to the support plate, and an elastic member is provided between the bottom surface of the annular boss and the bottom surface of the sleeve.

[0010] Optionally, the elastic member is a spring, one end of the spring abuts against the bottom surface of the annular boss, and the other end of the spring abuts against the bottom surface of the sleeve.

[0011] Optionally, the shaft section of the pressing shaft extending below the support plate is provided with a stop plate, and the stop plate can contact the lower surface of the support plate.

[0012] Optionally, the switch bracket adopts an L-shaped plate, including a horizontal plate portion and a vertical plate portion connected vertically, the horizontal plate portion is installed with a mechanical precision switch through a mounting hole, and the bottom end of the vertical plate portion is provided with a flange and is fixed to the support plate through the flange.

[0013] Optionally, the mounting hole is an elongated hole, and the long axis of the elongated hole and the axis of the lever are located in the same vertical plane.

[0014] In the second aspect, an embodiment of the utility model provides a lifting device, including a lifting mechanism and the mechanical overload limiter described in the first aspect, wherein the lifting mechanism is fixed on the upper surface of the carrier, and the mechanical precision switch is connected to the lifting power supply circuit of the lifting mechanism.

[0015] In the third aspect, an embodiment of the utility model provides a lifting device, comprising a lifting mechanism and the mechanical overload limiter described in the first aspect, wherein the lifting mechanism is located below a support plate, the lifting mechanism is connected to one end of a suspension connector, the suspension connector passes through the support plate and is connected to the load-bearing member, and the mechanical precision switch is connected to the lifting power supply circuit of the lifting mechanism.

[0016] The beneficial effects of the above utility model are as follows:

[0017] The overload limiter of the utility model is provided with a plurality of elastic mechanisms between the downward pressure end of the bearing member and the supporting plate, the downward pressure rod of the downward pressure end of the bearing member corresponds to one end of the lever, and the other end of the lever corresponds to the mechanical precision switch. When the lifting mechanism connected to the bearing member reaches the rated load, the downward pressure end of the bearing member compresses the elastic mechanism and applies downward pressure to one end of the lever through the downward pressure rod, and the other end of the lever touches and triggers the mechanical precision switch, thereby feeding back a signal that the lifting mechanism has reached the rated load through the mechanical precision switch, thereby protecting the lifting mechanism. The entire overload limiter is a purely mechanical structure, does not involve electronic and electrical components, has strong radiation resistance, and prevents the electronic overload limiter from failing to work stably in a radioactive environment and causing a lifting device failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0020] Figure 2 This is a partial enlarged view of the lower pressing end of the bearing member of Example 1 of the utility model;

[0021] Figure 3 This is a cross-sectional view of the elastic mechanism of Embodiment 1 of the utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of Embodiment 3 of the present utility model;

[0023] Among them, 1. support plate, 2. elastic mechanism, 3. lever pin, 4. fixed seat, 5. lever, 6. switch bracket, 7. mechanical precision switch, 8. lower pressure rod, 9. rotating rod, 10. hinged seat, 11. lower pressure plate, 12. lifting mechanism, 13. mounting hole, 14. suspension connector. DETAILED DESCRIPTION

[0024] Example 1

[0025] This embodiment provides a mechanical overload limiter, such as Figure 1-Figure 2 As shown, it includes a support plate 1, and a bearing member is arranged above the support plate 1. The bearing member is used to connect with the lifting mechanism. One end of the bearing member is rotatably connected to the support plate 1 as a rotating connection end, and a plurality of elastic mechanisms 2 are arranged between the other end and the support plate 1 as a pressing end. A fixing seat 4 is also arranged on the support plate 1. The fixing seat 4 is rotatably connected to the non-end position of the lever 5 through a lever pin 3. One end of the lever 5 corresponds to the pressing rod 8 on the bottom surface of the pressing end of the bearing member, and the other end corresponds to the mechanical precision switch 7. The mechanical precision switch 7 is used to be connected in the lifting power supply circuit of the lifting mechanism. When the lifting mechanism reaches the rated load, the bearing member overcomes the elastic force of the elastic mechanism 2 and presses down, so that the pressing rod 8 applies downward pressure to one end of the lever 5, and the other end of the lever 5 rotates upward to trigger the mechanical precision switch 7. The mechanical precision switch 7 is actuated to disconnect the lifting power supply circuit of the lifting mechanism.

[0026] The support plate 1 is a rectangular plate. In some other embodiments, the support plate 1 may be a square plate or a circular plate, etc., and those skilled in the art may configure it according to actual needs.

[0027] The bearing member comprises two rotating rods 9 arranged in parallel, one end of the rotating rod 9 is used as a rotating connection end, and the other end is used as a pressing end.

[0028] An articulated seat 10 is provided between the rotational connection ends of the two rotational rods 9 , and the articulated seat 10 is fixed on the support plate 1 . The rotational connection ends of the two rotational rods 9 are rotationally connected to the articulated seat 10 via a pin shaft, thereby realizing the rotational connection between the bearing member and the support plate 1 .

[0029] The pressing ends of the two rotating rods 9 are fixedly connected with a pressing plate 11 , and a pressing rod 8 is provided on the bottom surface of the pressing plate 11 for applying a pressing force to the lever 5 .

[0030] A plurality of elastic mechanisms 2 are arranged between the lower pressure plate 11 and the support plate 1. Preferably, an elastic mechanism 2 is arranged between the two ends of the lower pressure plate 11 and the support plate 1, and the two elastic mechanisms 2 are symmetrically arranged relative to the center of the lower pressure plate 11. With this arrangement, the force on the lower pressure plate 11 is uniform.

[0031] The two elastic mechanisms 2 have the same structure, and both include a sleeve 2 - 1 , a lower pressing shaft 2 - 2 , an elastic member, and the like.

[0032] Specifically, Figure 3 As shown, an annular boss 2-3 is provided on the outer shaft surface of the set position of the lower pressure shaft 2-2, and the shaft section of the lower pressure shaft above the annular boss 2-3 extends into a through hole provided at the end of the lower pressure plate 11. The diameter of the through hole is larger than the diameter of the lower pressure shaft 2-2 and smaller than the outer diameter of the annular boss 2-3. The bottom surface of the lower pressure plate 11 contacts the upper surface of the annular boss 2-3.

[0033] The sleeve 2 - 1 is open at the top and its bottom is fixed on the upper surface of the support plate 1 .

[0034] The shaft section of the lower pressing shaft 2-2 located below the annular boss 2-3 passes through the bottom of the sleeve 2-1 and the support plate 1 in sequence and then extends to the bottom of the support plate 1.

[0035] An elastic member is provided between the bottom surface of the annular boss 2-3 and the bottom surface of the sleeve 2-1.

[0036] The elastic member is a spring 2-4, one end of the spring 2-4 abuts against the lower surface of the annular boss 2-3, and the other end abuts against the bottom surface of the sleeve 2-1.

[0037] The shaft section of the lower pressing shaft 2-1 extending below the support plate 1 is provided with a stop plate 2-5, and the stop plate 2-5 can contact with the lower surface of the support plate 1 to limit the upward movement of the lower pressing shaft 2-1.

[0038] Based on the above structure, when the load on the bearing member reaches the set value, the pressing end will move downward, the annular boss 2-3 will overcome the elastic force of the spring 2-4 to compress the spring 2-4, and the pressing rod 8 will touch one end of the lever 5 to press down the end of the lever 5.

[0039] The mechanical precision switch 7 is located above the other end of the lever. The mechanical precision switch 7 can use existing equipment, and its specific structure will not be described in detail here.

[0040] The mechanical precision switch 7 is fixed on the support plate 1 through the switch bracket 6. The switch bracket 6 adopts a bent plate structure. Preferably, the switch bracket 6 adopts an L-shaped plate, including a horizontal plate portion and a vertical plate portion vertically connected. One end of the horizontal plate portion is integrally connected to the top of the vertical plate portion, and the bottom end of the vertical plate portion is provided with a 90° flange. The 90° flange of the vertical plate portion is fixedly connected to the support plate 1 by multiple bolts.

[0041] The horizontal plate portion is provided with a mounting hole 13, and the mechanical precision switch 7 is fixedly connected to the horizontal plate portion through the mounting hole and a fixing nut.

[0042] In order to facilitate the position adjustment of the mechanical precision switch 7 , the mounting hole 13 is in the form of an elongated hole, and the long axis of the elongated hole and the axis of the lever 5 are in the same vertical plane.

[0043] The overload limiter of this embodiment is a purely mechanical structure, does not involve any electronic or electrical components, has a compact structure, and has strong radiation resistance, which provides a strong guarantee for the overload limit of the lifting mechanism and prevents the electronic overload limiter from failing to work stably in a radioactive environment and causing a malfunction of the lifting device.

[0044] Example 2

[0045] This embodiment provides a lifting device, such as Figure 1 As shown, the mechanical overload limiter described in Example 1 is provided, and also includes a lifting mechanism 14, which is fixed on the upper surface of the support member. The lifting mechanism 14 adopts an open hoisting vehicle, and the support member is fixed to the lifting power system of the open hoisting vehicle. The mechanical precision switch 7 is connected in series to the lifting power supply circuit of the lifting mechanism.

[0046] Example 3

[0047] This embodiment provides a lifting device, such as Figure 4 As shown, the mechanical overload limiter described in Example 1 is provided, and also includes a lifting mechanism 12. The lifting mechanism 12 is arranged below the support plate 1. The lifting mechanism 12 adopts an electric hoist. The top of the lifting mechanism is connected to the suspension connector 14. The suspension connector 14 passes through the support plate 1 through the opening on the support plate 1 and is fixedly connected to the bearing member. The suspension connector 14 adopts a connecting plate. The bottom end of the connecting plate is connected to the top hook of the electric hoist. The mechanical precision switch 7 is connected in series to the lifting power supply circuit of the lifting mechanism.

[0048] In the lifting devices of Example 2 and Example 3, when the lifting mechanism reaches the rated load, the lower pressure plate will overcome the elastic force of the springs 2-4 and press down, and apply a downward pressure load to one end of the lever 5 through the lower pressure rod 8. The other end of the lever 5 rotates upward and touches the mechanical precision switch 7, triggering the mechanical precision switch 7. The mechanical precision switch 7 disconnects the lifting power supply circuit of the lifting mechanism 12, and the lifting mechanism 12 can only perform a descending movement, thereby protecting the lifting mechanism 12.

[0049] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A mechanical overload limiter, characterized in that: It includes a support plate, a bearing member is arranged above the support plate, one end of the bearing member is a rotating connection end, the rotating connection end is rotatably connected to the support plate, and the other end serves as a pressing end. A plurality of elastic mechanisms are arranged between the pressing end and the support plate. A fixed seat is also arranged on the support plate, the fixed seat is rotatably connected to a lever, one end of the lever corresponds to a pressure rod arranged on the bottom surface of the pressing end of the bearing plate, and the other end corresponds to a mechanical precision switch, and the mechanical precision switch is fixed to the support plate through a switch bracket.

2. A mechanical overload limiter as claimed in claim 1, characterized in that: The bearing member comprises two rotating rods, the rotating connecting ends of the rotating rods are rotatably connected to the hinge seats arranged on the supporting plates, the pressing ends of the rotating rods are provided with a pressing plate, and a plurality of elastic mechanisms are arranged between the pressing plate and the supporting plate.

3. A mechanical overload limiter as claimed in claim 1, characterized in that: An elastic mechanism is arranged between the two ends of the downward pressing end of the bearing member and the supporting plate.

4. A mechanical overload limiter as claimed in claim 1, characterized in that: The elastic mechanism includes a lower pressure shaft, on which an annular boss is arranged, a shaft section of the lower pressure shaft above the annular boss extends into a through hole arranged on the supporting member, a bottom surface of the supporting member contacts the upper surface of the annular boss, a shaft section of the lower pressure shaft below the annular boss passes through a sleeve and a support plate in sequence, a bottom end of the sleeve is fixed to the support plate, and an elastic member is arranged between the bottom surface of the annular boss and the bottom surface of the sleeve.

5. A mechanical overload limiter as claimed in claim 4, characterized in that: The elastic member is a spring, one end of which abuts against the bottom surface of the annular boss, and the other end of which abuts against the bottom surface of the sleeve.

6. A mechanical overload limiter as claimed in claim 4, characterized in that: The shaft section of the pressing shaft extending below the support plate is provided with a stop plate, and the stop plate can contact the lower surface of the support plate.

7. A mechanical overload limiter as claimed in claim 1, characterized in that: The switch bracket adopts an L-shaped plate, including a horizontal plate portion and a vertical plate portion connected vertically. The horizontal plate portion is installed with a mechanical precision switch through a mounting hole, and the bottom end of the vertical plate portion is provided with a flange and is fixed to the support plate through the flange.

8. A mechanical overload limiter as claimed in claim 7, characterized in that: The mounting hole is an elongated hole, and the long axis of the elongated hole and the axis of the lever are located in the same vertical plane.

9. A lifting device, characterized in that: It comprises a lifting mechanism and the mechanical overload limiter as described in any one of claims 1 to 7, wherein the lifting mechanism is fixed on the upper surface of the bearing member, and the mechanical precision switch is connected to the lifting power supply circuit of the lifting mechanism.

10. A lifting device, characterized in that: It includes a lifting mechanism and the mechanical overload limiter as described in any one of claims 1 to 7, wherein the lifting mechanism is located below the support plate, the lifting mechanism is connected to one end of a suspension connector, the suspension connector passes through the support plate and is connected to the bearing member, and the mechanical precision switch is connected to the lifting power supply circuit of the lifting mechanism.

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