Corrosion-resistant torque limiter

Abstract

The utility model relates to tower crane equipment technical field especially is a kind of corrosion-resistant torque limiter, including protective sleeve, the inside fixed connection of protective sleeve has fixed cylinder, the upper and lower sides of fixed cylinder inside are all fixedly connected with fixed block, the inside movable connection of fixed block has connecting frame, the left side fixed connection of connecting frame inside is hinged with travel switch, the right side fixed connection of connecting frame inside is hinged with top column.The utility model is equipped with fixed block, fixed cylinder and protective sleeve, it is favorable to the protection of travel switch, second sealing ring is used to ensure the sealing between cylinder body and block, first sealing ring is used to ensure that the moisture and dust of outside cannot cause corrosion to bolt or enter cylinder body through the gap between bolt and cylinder body, sealing sleeve is used to ensure the sealing between connecting block and block, prevent the oxidation corrosion of switch body by the dust and moisture of outside, prolong the service life of torque limiter.

Description

Technical Field

[0001] This utility model relates to the field of tower crane equipment technology, and in particular to a corrosion-resistant torque limiter. Background Technology

[0002] When using tower cranes on construction sites, each crane has a rated lifting capacity. To ensure construction safety, the weight of the load must not exceed this rated capacity. Therefore, tower cranes are generally equipped with electronic torque limiters to prevent overloading. Among these, electronic torque limiters using bow-shaped spring plates are widely chosen due to their simple structure and low cost.

[0003] Due to the harsh environment on construction sites, torque limiters are exposed to humid and dusty conditions for extended periods, making them prone to oxidation and corrosion. This can lead to decreased sensitivity or failure of the torque limiter, affecting safety. Therefore, a corrosion-resistant torque limiter is provided. Utility Model Content

[0004] In view of this, the present invention provides a corrosion-resistant torque limiter, the main technical problem to be solved is: the torque limiter is prone to oxidation and corrosion in humid and dusty environments, which leads to decreased sensitivity or failure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a corrosion-resistant torque limiter, comprising a protective sleeve, a fixed cylinder fixedly connected inside the protective sleeve, fixed blocks fixedly connected to the upper and lower sides of the inner side of the fixed cylinder, a connecting frame movably connected inside the fixed block, a limit switch fixedly connected to the left side of the inner side of the connecting frame, a top column fixedly connected to the right side of the inner side of the connecting frame, the fixed block comprising a block body fixedly connected to the upper and lower sides of the inner side of the fixed cylinder, sealing grooves provided on the upper and lower sides of the outer side of the block body, an annular groove provided in the middle of the outer side of the block body, a guide post fixedly connected to the inner side of the block body, a spring movably sleeved on the outer side of the guide post, and a sealing sleeve fixedly connected to the inner side of the block body.

[0006] By adopting the above technical solution, the cylinder is fitted over the outside of the two blocks during use, allowing the second sealing ring to enter the sealing groove, ensuring the sealing between the cylinder and the blocks. Then, the bolts are tightened to allow them to enter the annular groove, thus connecting the cylinder and the blocks together. Next, the protective sleeve is fitted over the outside of the cylinder. The torque limiter is then fixed to the torque monitoring position of the tower crane via the connecting block. When the load is large, the connecting block moves away from the bow-shaped spring plate, stretching and deforming it. This deformation causes the bow-shaped spring plate to move the guide tube and column towards the center. When the maximum load is reached, the column contacts the switch body, cutting off the control circuit and stopping the tower crane, preventing excessive load and potential danger. The sealing sleeve ensures the sealing between the connecting block and the blocks during the movement of the connecting block, preventing external dust and moisture from entering the cylinder and ensuring the switch body is not easily oxidized and corroded by dust and moisture, thus extending the service life of the torque limiter.

[0007] As a further description of the above technical solution: the protective sleeve includes a sleeve body, and the upper and lower sides of the inner side of the sleeve body are fixedly connected with first sealing rings.

[0008] By adopting the above technical solution, the sleeve is made of alumina ceramic material, which is corrosion resistant and has good thermal insulation effect, ensuring that the external temperature will not affect the internal limit switch. The first sealing ring is made of rubber material, and the outer side of the cylinder is provided with the first sealing ring entering the groove. When the first sealing ring enters the groove on the outer side of the cylinder, it can ensure the sealing between the sleeve and the cylinder, ensuring that external water vapor and dust will not corrode the bolt or enter the cylinder through the gap between the bolt and the cylinder.

[0009] As a further description of the above technical solution: the fixed cylinder includes a cylinder body fixedly connected inside the protective sleeve, the cylinder body is internally threaded with bolts, and a second sealing ring is fixedly connected to the inner side of the cylinder body.

[0010] By adopting the above technical solution, the second sealing ring is made of rubber.

[0011] As a further description of the above technical solution: the connecting frame includes a connecting block movably connected inside the fixed block, a lifting plate is fixedly connected to the outside of the connecting block, the lifting plate has a through hole inside, and bow-shaped spring plates are fixedly connected to both the left and right sides between the connecting blocks.

[0012] By adopting the above technical solution, the through hole is used for the lifting plate to rise and fall on the outside of the guide column to ensure the stability of the connecting block during the lifting and falling. The bow-shaped spring plate is a spring plate structure that can deform when subjected to external force.

[0013] As a further description of the above technical solution: the top column includes a column body fixedly connected to the right side of the inner side of the connecting frame, and a limit sleeve is fixedly connected to the outer side of the column body.

[0014] By adopting the above technical solution, the column can move inside the guide tube, and the limiting sleeve is used to limit the distance the column is inserted into the guide tube.

[0015] As a further description of the above technical solution: the limit switch includes a guide tube fixedly connected to the left side of the inner side of the connecting frame, and the switch body is fixedly connected inside the guide tube.

[0016] By adopting the above technical solution, the switch body is electrically connected to the tower crane's control system. When the column moves towards the switch body inside the guide tube and hits the switch body, the switch body can cut off the control circuit, causing the tower crane's control system to stop working.

[0017] By employing the above technical solution, the corrosion-resistant torque limiter of this utility model has at least the following beneficial effects:

[0018] Compared with existing technologies, this corrosion-resistant torque limiter, by incorporating a fixing block, a fixing cylinder, and a protective sleeve, effectively protects the limit switch. In use, the cylinder is fitted over the two blocks, allowing the second sealing ring to enter the sealing groove, ensuring a tight seal between the cylinder and the blocks. Then, the bolt is tightened, causing it to enter the annular groove, thus connecting the cylinder and the blocks together. The protective sleeve is then fitted over the cylinder. The first sealing ring prevents external moisture and dust from corroding the bolt or entering the cylinder through the gap between the bolt and the cylinder. The sealing sleeve ensures a tight seal between the connecting block and the blocks, preventing external dust and moisture from entering the cylinder. This prevents the switch body from easily oxidizing and rusting due to dust and moisture, extending the service life of the torque limiter. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of a corrosion-resistant torque limiter proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of a corrosion-resistant torque limiter proposed in this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the fixing block structure of a corrosion-resistant torque limiter proposed in this utility model.

[0022] Figure 4 A schematic diagram of the overall structure of the connecting frame of the corrosion-resistant torque limiter proposed in this utility model;

[0023] Figure 5 This is a schematic diagram of the overall structure of the top column and the limit switch of a corrosion-resistant torque limiter proposed in this utility model.

[0024] Legend:

[0025] 1. Protective sleeve; 101. Sleeve body; 102. First sealing ring; 2. Fixing cylinder; 201. Cylinder body; 202. Bolt; 203. Second sealing ring; 3. Fixing block; 301. Block body; 302. Sealing groove; 303. Annular groove; 304. Guide column; 305. Spring; 306. Sealing sleeve; 4. Connecting frame; 401. Connecting block; 402. Lifting plate; 403. Through hole; 404. Bow-shaped spring plate; 5. Top column; 501. Column body; 502. Limit sleeve; 6. Limit switch; 601. Guide tube; 602. Switch body. Detailed Implementation

[0026] Reference Figure 1-5This utility model provides a corrosion-resistant torque limiter, comprising a protective sleeve 1, a fixed cylinder 2 fixedly connected inside the protective sleeve 1, fixed blocks 3 fixedly connected to the upper and lower sides of the inner side of the fixed cylinder 2, a connecting frame 4 movably connected inside the fixed blocks 3, a limit switch 6 fixedly connected to the left side of the inner side of the connecting frame 4, and a top column 5 fixedly connected to the right side of the inner side of the connecting frame 4. The fixed blocks 3 include blocks 301 fixedly connected to the upper and lower sides of the inner side of the fixed cylinder 2, and sealing grooves 302 provided on the upper and lower sides of the outer side of the blocks 301. The sealing grooves 302 are used for pressing in the second sealing ring 203, and an annular groove 302 is provided in the middle of the outer side of the blocks 301. 3. The annular groove 303 is used for the insertion of the bolt 202 to fix the fixed cylinder 2. A guide post 304 is fixedly connected to the inner side of the block 301. The guide post 304 is used to guide the lifting of the lifting plate 402. A spring 305 is movably sleeved on the outer side of the guide post 304. The spring 305 is in a compressed state to ensure the position of the block 301 and to ensure that the block 301 is always in the center position of the connecting frame 4. A sealing sleeve 306 is fixedly connected to the inner side of the block 301. The sealing sleeve 306 is made of rubber to ensure better sealing between the block 301 and the connecting block 401. When in use, the cylinder 2... 01 is fitted onto the outside of the two blocks 301, allowing the second sealing ring 203 to enter the sealing groove 302, ensuring the seal between the cylinder 201 and the blocks 301. Then, the bolt 202 is tightened to enter the annular groove 303, thus connecting the cylinder 201 and the blocks 301 together. Next, the protective sleeve 1 is fitted onto the outside of the cylinder 201. Then, the torque limiter is fixed to the torque monitoring position of the tower crane via the connecting block 401. When the load is large, the connecting block 401 will move away from the bow-shaped spring plate 404, thereby stretching the bow-shaped spring plate 404. When the bow-shaped spring plate 404 deforms, it will drive the guide tube 601 and the column 501 to move towards the center. When the maximum load is reached, the column 501 contacts the switch body 602, which cuts off the control circuit and stops the tower crane to prevent the load from being too large and causing danger. When the connecting block 401 moves, the sealing sleeve 306 can ensure the sealing between the connecting block 401 and the block 301, preventing external dust and moisture from entering the cylinder 201, ensuring that the switch body 602 will not be easily oxidized and rusted due to the corrosion of dust and moisture, and extending the service life of the torque limiter.

[0027] Furthermore, the protective sleeve 1 includes a sleeve body 101, which is made of alumina ceramic material. It is corrosion resistant and has good thermal insulation effect, ensuring that the external temperature will not affect the internal limit switch 6. The upper and lower sides of the inner side of the sleeve body 101 are fixedly connected with a first sealing ring 102, which is made of rubber material. The outer side of the cylinder 201 is provided with the first sealing ring 102 entering the groove. When the first sealing ring 102 enters the groove on the outer side of the cylinder 201, it can ensure the sealing between the sleeve body 101 and the cylinder 201, ensuring that external moisture and dust will not corrode the bolt 202 or enter the cylinder 201 through the gap between the bolt 202 and the cylinder 201.

[0028] Furthermore, the fixed cylinder 2 includes a cylinder body 201 fixedly connected inside the protective sleeve 1. The cylinder body 201 is internally threaded with bolts 202, and a second sealing ring 203 is fixedly connected to the inner side of the cylinder body 201. The second sealing ring 203 is made of rubber.

[0029] Furthermore, the connecting frame 4 includes a connecting block 401 movably connected inside the fixed block 3. A lifting plate 402 is fixedly connected to the outside of the connecting block 401. The lifting plate 402 has a through hole 403 inside. The through hole 403 is used for the lifting plate 402 to rise and fall outside the guide column 304, so as to ensure the stability of the connecting block 401 when it rises and falls. Bow-shaped spring plates 404 are fixedly connected to both the left and right sides between the connecting blocks 401. The bow-shaped spring plates 404 are spring plate structural components that can deform when subjected to external force.

[0030] Furthermore, the top column 5 includes a column 501 fixedly connected to the right side of the inner side of the connecting frame 4. The column 501 can move inside the guide tube 601. A limiting sleeve 502 is fixedly connected to the outer side of the column 501. The limiting sleeve 502 is used to limit the distance that the column 501 can be inserted into the guide tube 601.

[0031] Furthermore, the limit switch 6 includes a guide tube 601 fixedly connected to the left side of the inner side of the connecting frame 4. The switch body 602 is fixedly connected inside the guide tube 601. The switch body 602 is electrically connected to the control system of the tower crane. When the column 501 moves inside the guide tube 601 toward the switch body 602 and hits the switch body 602, the switch body 602 can cut off the control circuit, causing the control system of the tower crane to stop working.

[0032] Working principle: In use, the cylinder 201 is fitted over the two blocks 301, allowing the second sealing ring 203 to enter the sealing groove 302, ensuring a tight seal between the cylinder 201 and the blocks 301. Then, the bolt 202 is tightened, allowing it to enter the annular groove 303, thus connecting the cylinder 201 and the blocks 301 together. Afterward, the protective sleeve 1 is fitted over the outside of the cylinder 201. The first sealing ring 102 prevents external moisture and dust from corroding the bolt 202 or passing through the gap between the bolt 202 and the cylinder 201. The gap allows air to enter the cylinder 201. Under the action of the sealing sleeve 306, the sealing between the connecting block 401 and the block 301 is guaranteed, preventing external dust and moisture from entering the cylinder 201. This ensures that the switch body 602 will not be easily oxidized and rusted due to the erosion of dust and moisture, thus extending the service life of the torque limiter. The torque limiter is fixed to the torque monitoring position of the tower crane through the connecting block 401. When the maximum load is reached, the column 501 contacts the switch body 602, causing the control circuit to be cut off, thereby stopping the tower crane and preventing the load from being too large and causing danger.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant torque limiter, comprising a protective sleeve (1), characterized in that: The protective sleeve (1) is fixedly connected to a fixed cylinder (2). Fixed blocks (3) are fixedly connected to the upper and lower sides of the inner side of the fixed cylinder (2). A connecting frame (4) is movably connected to the inside of the fixed block (3). A limit switch (6) is fixedly connected to the left side of the inner side of the connecting frame (4). A top column (5) is fixedly connected to the right side of the inner side of the connecting frame (4). The fixed block (3) includes a block (301) fixedly connected to the upper and lower sides of the inner side of the fixed cylinder (2). Sealing grooves (302) are provided on the upper and lower sides of the outer side of the block (301). An annular groove (303) is provided in the middle of the outer side of the block (301). A guide column (304) is fixedly connected to the inner side of the block (301). A spring (305) is movably sleeved on the outer side of the guide column (304). A sealing sleeve (306) is fixedly connected to the inner side of the block (301).

2. The corrosion-resistant torque limiter according to claim 1, characterized in that: The protective sleeve (1) includes a sleeve body (101), and a first sealing ring (102) is fixedly connected to both the upper and lower sides of the inner side of the sleeve body (101).

3. The corrosion-resistant torque limiter according to claim 1, characterized in that: The fixed cylinder (2) includes a cylinder body (201) fixedly connected inside the protective sleeve (1), the cylinder body (201) is threaded with bolts (202), and the inner side of the cylinder body (201) is fixedly connected with a second sealing ring (203).

4. The corrosion-resistant torque limiter according to claim 1, characterized in that: The connecting frame (4) includes a connecting block (401) movably connected inside the fixed block (3). A lifting plate (402) is fixedly connected to the outside of the connecting block (401). A through hole (403) is provided inside the lifting plate (402). A bow-shaped spring plate (404) is fixedly connected to both the left and right sides between the connecting blocks (401).

5. A corrosion-resistant torque limiter according to claim 1, characterized in that: The top column (5) includes a column (501) fixedly connected to the right side of the inner side of the connecting frame (4), and a limit sleeve (502) fixedly connected to the outer side of the column (501).

6. A corrosion-resistant torque limiter according to claim 1, characterized in that: The limit switch (6) includes a guide tube (601) fixedly connected to the left side of the inner side of the connecting frame (4), and the switch body (602) is fixedly connected inside the guide tube (601).

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