Corrosion-resistant moment limiter
By designing corrosion-resistant torque limiters in tower crane equipment, using protective shell and induction cylinder structure to protect sensor contact points, the problems of sensor corrosion and signal interference in harsh environments are solved, and the accurate detection of tower crane load and construction safety is achieved promote.
Patent Information
- Application Number
- CN202420627949.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The torque limiter sensors in existing tower crane equipment are prone to oxidation and corrosion or are affected by sand and dust in harsh environments, resulting in inaccurate signal transmission and affecting construction safety.
A corrosion-resistant torque limiter is designed, adopting a protective shell and induction cylinder structure, and through the combination of trigger rod and abrasive parts, the sensor contact points are protected, oxidative corrosion and sand and dust are prevented, and electrical signal errors are used to avoid insulating materials.
It effectively prevents corrosion and signal interference from the sensor in harsh environments, ensures accurate detection of tower crane loads, and improves construction safety.
Smart Images
Figure CN222181638U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tower crane equipment, and specifically to a corrosion-resistant torque limiter. Background Art
[0002] When using tower cranes for construction at construction sites, each tower crane has a rated weight for hoisting objects. In order to ensure construction safety, the weight of the hoisted objects cannot exceed the rated weight during construction. Therefore, electronic torque limiters are generally installed on tower cranes to prevent overloading of the tower cranes. Among them, electronic torque limiters using bow-shaped spring plates are widely selected because of their simple structure and low cost. The electronic signals transmitted by sensors installed at the monitoring position of the tower crane are used to calculate the mass of the crane and the angle of the crane arm, and prompt the operator according to the set parameters.
[0003] The electronic torque limiter receives and processes information based on electrical signals, so it is very important to ensure that the electrical signals can be accurately transmitted to the computing system. However, tower cranes generally work on construction sites, where the working conditions are relatively harsh, with high temperatures, dust, rain, and moisture. Although protected by the outer casing, the outer casing will inevitably be damaged over time. As a result, the sensor sensing end of the torque limiter is exposed to the outside and will be affected by the natural environment, which will cause oxidation and rust or be contaminated with mud, affecting information transmission and thus affecting construction safety.
[0004] In summary, there is a need for a torque limiter that can ensure construction safety, can accurately sense the tower crane load without being affected by the external environment, can be applied to various harsh outdoor working conditions, and will not cause the sensor sensing end to be oxidized and corroded or contaminated by sand and dust affecting signal transmission. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model provides a corrosion-resistant torque limiter to solve the problem that the sensor sensing end of the existing torque limiter is easily oxidized and corroded or contaminated with sand and dust when working outdoors, which affects signal transmission.
[0006] A corrosion-resistant torque limiter, comprising a protective shell and a first bow-shaped spring plate and a second bow-shaped spring plate which are arranged opposite to and connected inside the protective shell. The first bow-shaped spring plate and both ends of the first bow-shaped spring plate are also provided with mounting seats, the mounting seats pass through the shell of the protective shell and are fixedly connected to the monitoring position of the tower crane, and a monitoring mechanism is provided at the middle position of the opposite surfaces of the first bow-shaped spring plate and the second bow-shaped spring plate, characterized in that: the monitoring mechanism comprises a sensor base with one end fixedly connected to the inner side of the first bow-shaped spring plate, a trigger rod fixedly connected to the sensor base, and a sensing tube with one end fixed to the inner side of the second bow-shaped spring plate, and the trigger rod is coaxial Inserted into the interior of the sensing tube, a cavity and a first polished piece are sequentially provided on the trigger rod located inside the sensing tube, the first polished piece is arranged around the end of the trigger rod, the cavity radially penetrates the trigger rod, a movable contact is also provided in the cavity, the movable contact can be radially displaced in the cavity, a spring is also provided at the bottom of the movable contact, the spring drives the movable contact to move toward the outside of the cavity, the inner wall of the sensing tube is also sequentially provided with a second polished piece surrounding the trigger rod and a fixed contact, when the frosted surface of the second polished piece contacts the movable contact, the fixed contact contacts the frosted surface of the first polished piece.
[0007] Furthermore, the first polishing piece also includes an elastic ring, and the side wall of the first polishing piece also has a fracture extending along its axial direction. The elastic ring is adhered to the end side wall of the trigger rod, and the first polishing piece is fixed to the elastic ring. The outer diameter of the first polishing piece is larger than the inner diameter of the fixed contact.
[0008] Furthermore, the contact surface of the fixed contact has a greater axial distance along the trigger rod than the movable contact.
[0009] Furthermore, movable contacts are provided at both ends of the cavity, and both ends of the spring abut against the movable contacts.
[0010] Furthermore, the trigger rod except the cavity, the movable contact and the frosted surface of the first polishing piece and the induction tube except the fixed contact and the frosted surface of the second polishing piece are coated with insulating material.
[0011] Furthermore, there is a space between the fixed contact and the bottom of the sensing tube.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] The utility model has a simple structure. The sensor on the trigger element of the torque limiter is improved, a trigger rod is arranged, and a sensing tube that wraps the trigger rod is also arranged, so that the electrical signal contacts on the trigger rod are protected from being corroded by rain, mud and soil due to being exposed in harsh working conditions. At the same time, corresponding grinding parts are arranged in the sensing tube and on the trigger rod, which can grind the contact surfaces of the contacts against each other, grind off naturally generated rust and contaminated dust on the contact surfaces, reduce the influence of poor contact as much as possible, and ensure the safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0015] Figure 2 This is a schematic diagram of the interior of the monitoring agency.
[0016] Figure 3 It is a schematic diagram of the structure of disconnection inside the monitoring mechanism.
[0017] Figure 4 for Figure 2 An enlarged schematic diagram of point A.
[0018] Figure 5 for Figure 3 Enlarged view of point B.
[0019] Figure 6 It is an internal side view of the utility model.
[0020] Figure 7 This is a circuit diagram of the utility model.
[0021] In the above drawings:
[0022] 1. Protective shell;
[0023] 2. The first bow-shaped spring plate;
[0024] 3. Mounting seat;
[0025] 4. Second bow-shaped spring plate;
[0026] 5. Monitoring mechanism; 51. Sensor base; 52. Trigger rod; 521. Movable contact; 522. Spring; 523. Cavity; 524. First polished piece; 5241. Elastic ring; 5242. Fracture; 53. Induction tube; 531. Second polished piece; 532. Fixed contact; 54. Insulating material;
[0027] 6. Torque limiter computer
[0028] A. Figure 2 Partial enlargement.
[0029] B. Figure 3Partial enlarged image. DETAILED DESCRIPTION
[0030] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 as well as Figure 7 As shown, the utility model proposes a corrosion-resistant torque limiter, including a protective shell 1 and a first bow-shaped spring plate 2 and a second bow-shaped spring plate 4 that are relatively arranged and connected inside the protective shell 1. The first bow-shaped spring plate 2 and both ends of the first bow-shaped spring plate 2 are also provided with a mounting seat 3, the mounting seat 3 passes through the shell of the protective shell 1 and is fixedly connected to the tower crane monitoring position, and a monitoring mechanism 5 is provided at the middle position of the opposite surfaces of the first bow-shaped spring plate 2 and the second bow-shaped spring plate 4.
[0032] The monitoring mechanism 5 includes a sensor base 51 with one end fixed to the inner side of the first bow-shaped spring plate 2, a trigger rod 52 fixed to the sensor base 51, and a sensing tube 53 with one end fixed to the inner side of the second bow-shaped spring plate 4. The trigger rod 52 is coaxially inserted into the sensing tube 53 to fix the mounting base at the monitoring position of the tower crane. When the tower crane is working and the load is too large, the first bow-shaped spring plate 2 is deformed, thereby pushing the sensor base 51 to move, and the trigger rod 52 is displaced further toward the sensing tube 53, or the second bow-shaped spring plate 4 connected to the sensing tube 53 is deformed, and the sensing tube 53 is displaced toward the sensor base 51.
[0033] The trigger rod 52 located inside the sensing tube 53 is also provided with a cavity 523 and a first polishing piece 524 in sequence. The first polishing piece 524 is arranged around the end of the trigger rod 52. The cavity 523 radially penetrates the trigger rod 52. A movable contact 521 is also provided in the cavity 523. The movable contact 521 can be radially displaced in the cavity 523. A spring 522 is also provided at the bottom of the movable contact 521. The spring 522 drives the movable contact 521 to move toward the outside of the cavity 523. The inner wall of the sensing tube is also provided with a second polishing piece 531 and a fixed contact 532 surrounding the trigger rod 52 in sequence. When the frosted surface of the second polishing piece 531 contacts the movable contact 521, the fixed contact 532 contacts the frosted surface of the first polishing piece 524.
[0034] Through the improvement of the above structure, the induction tube 53 is provided to protect the contacts, so as to prevent the sensor contacts from being rusted and damaged due to long-term exposure to the outdoors. When the tower crane reaches a certain load, the trigger rod 52 continues to move toward the inside of the induction tube 53, and the end of the trigger rod 52 and the grinding pieces on the inner wall of the induction tube 53 first grind the contact surfaces of the movable contact 521 and the fixed contact 532 respectively, and grind off foreign matter such as dust and rust on the contact surfaces of the contacts. Then, when the movable contact 521 contacts the fixed contact 532, a path is formed, and the sensor receives the current signal and transmits the information back to the microcomputer of the torque limiter.
[0035] like Figure 3 and Figure 5 as well as Figure 6 As shown, the first polishing piece 524 also includes an elastic ring 524.1, and the side wall of the first polishing piece is further provided with a fracture 524.2 extending along its axial direction. The elastic ring 524.1 is larger than the inner diameter of the fixed contact 532. Through the improvement of the above structure, since the elastic ring 524.1 itself is soft, even if the outer diameter of the first polishing piece 524 is larger than the inner diameter of the fixed contact 532, it can be slightly compressed so that the first polishing piece 524 can be pressed into the area of the fixed contact 532. At the same time, the fracture 524.2 on the first polishing piece 524 allows the first polishing piece 524 to expand and contract with the elastic ring 524.1, so that the compressed elastic ring 524.1 provides a force to the first polishing piece 524 so that the first polishing piece 524 can better press against the contact surface of the fixed contact 532.
[0036] like Figure 2 and Figure 3 As shown, the contact surface of the fixed contact 532 has a greater axial distance along the trigger rod 52 than the movable contact 521, and there is a spacing space between the fixed contact 532 and the bottom of the sensing tube 53. The fixed contact 532 with a longer contact distance is provided to prevent the bow-shaped spring plate from further deforming, which causes the trigger rod 52 to continue to move toward the inside of the sensing tube 53. At this time, the contacts are easily disconnected, so the contact surface of the fixed contact 532 is lengthened to ensure that the trigger rod 52 continues to form a passage with the sensing tube 53. The reserved spacing space is also to prevent the trigger rod 52 that is displaced first from further squeezing the sensing tube 53 during the gradual deformation of the bow-shaped spring plate after multiple monitoring mechanisms 5 are provided, thereby damaging the monitoring mechanism 5.
[0037] like Figure 2 and Figure 3 as well as Figure 5 Both ends of the cavity 523 are provided with movable contacts 521, and both ends of the spring 522 abut against the movable contacts 521. The narrowing of the opening of the cavity 523 limits the displacement of the movable contact within the cavity 523, so that the movable contact 521 will not fall off, and the resistance of the compression spring 522 is utilized to ensure stable contact of the contacts at all times.
[0038] like Figure 2 and Figure 3 as well as Figure 7 As shown, the monitoring mechanism 5 is electrically connected to the torque limiter electronic computer 6. The torque limiter electronic computer 6 uses the monitoring current size after each monitoring mechanism 5 forms a path to determine the load condition of the torque limiter. In order to avoid erroneous electrical signals, the trigger rod 52 except for the cavity 523 and the movable contact 521 and the frosted surface of the first polishing piece 524 and the induction tube 53 except for the fixed contact 532 and the frosted surface of the second polishing piece 531 are coated with insulating material 54. Through the above structure, stability can be guaranteed even in construction sites with harsh working conditions, and the insulating material 54 avoids the breakdown effect that causes the transmission of erroneous electrical signals to mislead the staff.
[0039] like Figure 1 As shown, Figure 1 As shown, several groups of monitoring mechanisms 5 can be installed between the first bow-shaped spring plate 2 and the second bow-shaped spring plate 4. Multiple groups of monitoring mechanisms 5 make the monitoring data more accurate.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A corrosion-resistant torque limiter, characterized in that: The tower crane comprises a protective shell and a first bow-shaped spring plate and a second bow-shaped spring plate which are arranged opposite to and connected to each other inside the protective shell. Mounting seats are also arranged at both ends of the first bow-shaped spring plate and the first bow-shaped spring plate. The mounting seats pass through the shell of the protective shell and are fixedly connected to the monitoring position of the tower crane. A monitoring mechanism is arranged at the middle position of the opposite surfaces of the first bow-shaped spring plate and the second bow-shaped spring plate. The monitoring mechanism comprises a sensor base with one end fixedly connected to the inner side of the first bow-shaped spring plate, a trigger rod fixedly connected to the sensor base, and a sensing tube with one end fixed to the inner side of the second bow-shaped spring plate. The trigger rod is coaxially inserted into the sensing tube and positioned at the inner side of the second bow-shaped spring plate. A cavity and a first polished piece are sequentially provided on the trigger rod inside the sensing tube. The first polished piece is arranged around the end of the trigger rod, and the cavity radially penetrates the trigger rod. A movable contact is also provided in the cavity, and the movable contact can be radially displaced in the cavity. A spring is also provided at the bottom of the movable contact, and the spring drives the movable contact to move toward the outside of the cavity. A second polished piece and a fixed contact surrounding the trigger rod are sequentially provided on the inner wall of the sensing tube. When the frosted surface of the second polished piece contacts the movable contact, the fixed contact contacts the frosted surface of the first polished piece.
2. A corrosion-resistant torque limiter according to claim 1, characterized in that: The first polishing piece also includes an elastic ring, and the side wall of the first polishing piece is also provided with a fracture extending along its axial direction. The elastic ring is adhered to the end side wall of the trigger rod, and the first polishing piece is fixedly connected to the elastic ring. The outer diameter of the first polishing piece is greater than the inner diameter of the fixed contact.
3. A corrosion-resistant torque limiter according to claim 1, characterized in that: The outer diameter of the first grinding piece is smaller than the inner diameter of the second grinding piece.
4. A corrosion-resistant torque limiter according to claim 1, characterized in that: The contact surface of the fixed contact has a greater distance along the axial direction of the trigger rod than the contact surface of the movable contact.
5. A corrosion-resistant torque limiter according to claim 1, characterized in that: Both ends of the cavity are provided with movable contacts, and both ends of the spring abut against the movable contacts.
6. A corrosion-resistant torque limiter according to claim 1, characterized in that: The trigger rod except the cavity, the movable contact and the frosted surface of the first polishing piece and the induction tube except the fixed contact and the frosted surface of the second polishing piece are all coated with insulating material.
7. A corrosion-resistant torque limiter according to claim 1, characterized in that: There is a spacing space between the fixed contact and the bottom of the sensing tube.