Chain type lifting mechanism and automatic sampling device

Abstract

The utility model discloses a chain type lifting mechanism and an automatic sampling device, and belongs to the technical field of molten steel sampling. The chain type lifting mechanism comprises a driving chain wheel assembly, a driven chain wheel assembly and a transmission chain, the driven chain wheel assembly comprises a driven chain wheel, the driven chain wheel is arranged on a driven chain wheel shaft in a sleeved mode through a cam clutch in the driven chain wheel, and a torque disc is further arranged on the driven chain wheel shaft. According to the automatic sampling device disclosed by the utility model, the specific structure of the lifting mechanism is optimized, so that the downward sliding phenomenon caused by the increase of the weight of the driven side can be effectively avoided while the force of the driving side and the driven side can be automatically balanced, and the accuracy of the stay position of the detection unit in molten steel is ensured; and the detection result can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of molten steel sampling, and more specifically relates to a chain-type lifting mechanism and an automatic sampling device. Background Art

[0002] In steel production, vacuum refining plays a very important role in improving the quality of steel products, expanding varieties, reducing costs, and optimizing steel production processes. Direct temperature measurement and sampling of smelted metals is an important means to understand the metallurgical process and molten iron quality.

[0003] Traditional temperature measurement and sampling work is mainly done manually, but in the steelmaking process, due to factors such as high on-site temperature, large dust, and easy splashing of molten steel, manual operation is dangerous. If the operation is improper, it is easy to cause burns to personnel, so a series of automatic temperature measurement and sampling devices have appeared on the market. For example, the patent CN209356245U discloses a molten steel temperature measurement and sampling device. The application includes a temperature measuring gun, a slag breaking gun, a sampling gun and a gun rack. The gun rack is provided with three tracks arranged side by side and vertically arranged. The temperature measuring gun, the slag breaking gun and the sampling gun are arranged in turn in the three tracks. The top of the gun rack is provided with three displacement drive mechanisms. The three displacement drive mechanisms drive the temperature measuring gun, the slag breaking gun and the sampling gun to move up and down along the corresponding tracks respectively. The molten steel temperature measurement and sampling device can perform three operations of slag breaking, temperature measurement and sampling on molten steel, with strong versatility and easy operation.

[0004] For another example, the patent CN218212109U discloses an automated temperature measurement and sampling device for argon blowing. The application includes a silo and a waste box. The silo is provided with a temperature measurement sampling piece, and the waste box is used to store used temperature measurement sampling pieces. A floor is provided between the silo and the steelmaking furnace used in conjunction with the silo. The space where the silo is located is the first working space, the space where the steelmaking furnace is located is the second working space, and the waste box is located in the first working space. A receiving through hole for the temperature measurement sampling piece to pass through is provided on the floor. The silo also includes a manipulator, a positioning mechanism, and a lifting assembly. The manipulator and the positioning mechanism are both located in the first working space. A mounting frame is provided above the receiving through hole. The positioning mechanism is provided on the mounting frame. The manipulator is used to clamp the temperature measurement sampling piece and place the temperature measurement sampling piece on the positioning mechanism. The lifting assembly is provided on the positioning mechanism, and the lifting assembly drives the temperature measurement sampling piece to rise and fall. The present application has the effect of reducing the potential safety hazards caused by temperature measurement and sampling operations during argon blowing.

[0005] The above applications can all realize the automated temperature measurement and sampling of molten steel with high safety. However, due to the strict requirements on the position and time of the barrel and the temperature measuring element in the molten steel, there are high requirements for the positioning accuracy of the lifting mechanism. The conventional lifting mechanism uses a variable frequency motor reducer as the power source, and adopts a chain drive or wire rope drive. However, in actual use, due to the increase in the weight of the driven side, there will be an imbalance in the power between the driving side and the driven side. After the driven side stops, it will automatically slide down, resulting in inaccurate positioning, thus affecting the final test results. Utility Model Content

[0006] 1. Problems to be solved

[0007] In view of the problem that the existing chain lifting mechanism is prone to imbalance of power between the transmission side and the driven side, resulting in inaccurate positioning, the utility model provides a chain lifting mechanism and an automatic sampling device. In the utility model, by setting a cam clutch and a torque plate, while automatically balancing the power on the transmission side and the driven side, the sliding phenomenon caused by the increase of the weight on the driven side can be effectively avoided, thereby ensuring the accuracy of the moving position.

[0008] 2. Technical solution

[0009] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0010] The utility model discloses a chain lifting mechanism, comprising a driving sprocket assembly, a driven sprocket assembly and a transmission chain. The driven sprocket assembly comprises a driven sprocket, which is sleeved on a driven sprocket shaft through a cam clutch inside the driven sprocket, and a torque plate is also provided on the driven sprocket shaft.

[0011] Furthermore, the driven sprocket shaft is rotatably disposed in the bearing seat.

[0012] Furthermore, the cam clutch and the driven sprocket shaft, as well as the torque plate and the driven sprocket shaft are matched with keyways.

[0013] Furthermore, the driving sprocket assembly includes a driving source and a driving sprocket connected to an output end of the driving source; wherein the driving source is a variable frequency motor reducer, and the variable frequency motor reducer is equipped with an incremental encoder.

[0014] Furthermore, the transmission chain is equipped with a tensioning wheel.

[0015] The utility model discloses an automatic sampling device, comprising a frame and a detection unit, wherein the frame is provided with the above-mentioned chain lifting mechanism, and the chain lifting mechanism is used to drive the detection unit to move up and down; wherein the active sprocket assembly is arranged at the bottom of the frame, and the driven sprocket assembly is arranged at the top of the frame.

[0016] Furthermore, a moving platform is slidably provided on the frame, and the detection unit is arranged on the moving platform.

[0017] Furthermore, the frame is provided with at least three limit switches along its height direction, which are respectively located at the starting position, the end position and the middle position of the mobile platform; wherein the starting position and the end position are the moving stop positions of the mobile platform, and the middle position is the moving deceleration position of the mobile platform.

[0018] Furthermore, four limit switches are provided.

[0019] Furthermore, the detection unit is any one of a temperature measurement sampling device, an emergency top blowing device, a wire feeding guide device or a nitrogen blowing gun stirring device.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The utility model provides a chain lifting mechanism, in which a cam clutch is added inside the driven sprocket. When the force on the driven side increases, the output torque of the driving side can be automatically adjusted to balance the force on both sides of the driving side and the driven side, thereby ensuring the balance of force on both sides. At the same time, a torque plate is provided at one end of the driven sprocket shaft. When the weight of the driven side increases, the force of the disc spring inside the torque plate can effectively prevent the driven side from sliding down, thereby ensuring the accuracy of the final stop position.

[0023] (2) The automatic sampling device of the utility model can effectively avoid the sliding phenomenon caused by the increase of the weight of the driven side while automatically balancing the forces on the driving side and the driven side through the setting of the cam clutch and the torque plate, so as to ensure the accuracy of the position of the detection unit in the molten steel, which is conducive to ensuring the detection results. At the same time, the power of the original variable frequency motor reducer can also be reduced to save the investment cost of the equipment.

[0024] (3) In the automatic sampling device of the utility model, the detection unit is decelerated before stopping by setting a limit switch, which can effectively avoid the phenomenon that the stop position of the detection unit moves downward due to excessive inertia, and is also conducive to ensuring the accuracy of its stop position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an automatic sampling device of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the driving sprocket assembly in the utility model;

[0027] Figure 3 It is a structural schematic diagram of the driven sprocket assembly in the utility model.

[0028] In the figure: 1, driving sprocket assembly; 11, driving source; 12, driving sprocket;

[0029] 2. Driven sprocket assembly; 21. Driven sprocket; 22. Cam clutch; 23. Driven sprocket shaft; 24. Torque plate; 25. Bearing seat;

[0030] 3. Transmission chain; 4. Tensioner; 5. Frame; 6. Detection unit; 7. Mobile platform; 8. Limit switch. DETAILED DESCRIPTION

[0031] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] As mentioned in the background art, in the temperature measurement and sampling operation of molten steel, there are strict requirements on the position and time of the gun barrel and the temperature measuring element in the molten steel, so there are high requirements on the positioning accuracy of the lifting mechanism.

[0034] Conventional lifting mechanisms use variable frequency motor reducers as power sources and adopt chain drive or wire rope drive. At the same time, in order to be able to control the transmission speed and position of the driven side. Generally, variable frequency motor reducers are equipped with brakes, and the brakes on the variable frequency motor reducers are used to control the driven side to stop at the specified position. An absolute encoder and an incremental encoder are installed on the transmission system. The absolute encoder is used to control the stop position of the driven side; the incremental encoder is used to detect the running speed of the variable frequency motor reducer. The running speed of the variable frequency motor reducer can be controlled by controlling the running speed of the variable frequency motor reducer through the frequency converter in the control system.

[0035] However, it is found in actual use that due to the weight and position of the driven side, there will be an imbalance of power between the driving side and the driven side. After the driven side stops, it will automatically slide down, resulting in inaccurate positioning. Of course, the above situation can be improved by increasing the power of the variable frequency motor reducer to increase the braking force of the brake. However, this method of increasing the motor power will increase the cost. For this reason, the utility model aims to provide an automatic sampling device that can accurately position and has a low cost.

[0036] The utility model is further described below in conjunction with specific embodiments.

[0037] refer to Figure 1 As shown, an automatic sampling device of this embodiment includes a frame 5, a detection unit 6 and a mobile platform 7. The frame 5 serves as the installation base of the entire device. The mobile platform 7 is slidably arranged on the frame 5, and its sliding direction is along the height direction of the frame 5. The detection unit 6 is arranged on the mobile platform 7 and moves synchronously with the mobile platform 7.

[0038] At the same time, a lifting mechanism is also provided on the frame 5. The lifting mechanism is used to drive the mobile platform 7 and the detection unit 6 thereon to move up and down, so that the detection unit 6 can be inserted into the molten steel to a specified depth to complete the detection operation. The detection unit (6) can be any one of a temperature measurement sampling device, an emergency top blowing device, a wire feeding guide device or a nitrogen blowing gun stirring device, or other tools and equipment for assisting steelmaking.

[0039] In this embodiment, as an implementation of the lifting mechanism, the lifting mechanism is a chain lifting mechanism, which includes a driving sprocket assembly 1, a driven sprocket assembly 2 and a transmission chain 3. When working, the driving sprocket assembly 1 drives the transmission chain 3 to rotate, so as to complete the lifting and lowering operations of the mobile platform 7.

[0040] Specifically, Figure 2 As shown, the driving sprocket assembly 1 includes a driving source 11 disposed at the bottom of the frame 5, and the output end of the driving source 11 is connected to a driving sprocket 12. The driving sprocket 12 is meshed with the driven sprocket 21 of the driven sprocket assembly 2 through the transmission chain 3.

[0041] Preferably, the driving source 11 is a variable frequency motor reducer, and the variable frequency motor reducer is equipped with an incremental encoder for detecting the output speed of the variable frequency motor reducer. At the same time, a tensioning wheel 4 is equipped on one side of the transmission chain 3 to adjust the tension of the transmission chain 3.

[0042] like Figure 3As shown, the driven sprocket assembly 2 includes a driven sprocket 21, a cam clutch 22, and a driven sprocket shaft 23. The driven sprocket shaft 23 is rotatably arranged on the top of the frame 5 through a bearing seat 25. The cam clutch 22 is fixedly sleeved on the driven sprocket shaft 23, and the cam clutch 22 is arranged in the inner ring of the driven sprocket 21 and fixed by end covers on both sides.

[0043] In addition, a torque plate 24 is fixedly sleeved on one end of the driven sprocket shaft 23. A torque arm is provided on the flange of the torque plate 24, and a stopper matched with the torque arm is provided on the frame 5.

[0044] Preferably, the cam clutch 22 and the driven sprocket shaft 23 , as well as the torque plate 24 and the driven sprocket shaft 23 , can be connected via keyway cooperation.

[0045] An automatic sampling device of this embodiment optimizes the structure of the lifting mechanism and adds a cam clutch 22 in the driven sprocket 21. When the weight of the driven side (i.e., the mobile platform side) increases, the output torque of the driving side can be automatically adjusted to balance the forces on the driving side and the driven side, ensuring the balance of forces on the driving side and the driven side. At the same time, by providing a torque disk 24 at one end of the driven sprocket shaft 23, when the weight of the driven side increases, the force of the disc spring inside the torque disk can effectively prevent the driven side from sliding down, thereby ensuring the accuracy of the position of the detection unit 6 in the molten steel, which is conducive to ensuring the detection results. In addition, the power of the original variable frequency motor reducer can be reduced to save the investment cost of the equipment.

[0046] As another embodiment of the automatic sampling device of this embodiment, the traditional absolute encoder is used to control the stop position of the driven side. Instead, a plurality of limit switches 8 are provided on the moving path of the mobile platform 7. The specific position of the mobile platform 7 is determined by the limit switches 8 at different positions, and then the mobile platform 7 is finally stopped by first decelerating and then stopping. This stopping method can effectively reduce the interference caused by the inertia generated during the movement of the mobile platform 7 to the accuracy of its stop position.

[0047] Specifically, refer to Figure 1 As shown, at least three limit switches 8 are provided on the frame 5 along its height direction, which are respectively located at the starting position, the end position and the middle position of the mobile platform 7. It should be noted that the starting position here refers to the position where the mobile platform 7 is lifted to the highest point. The end position is the position where the mobile platform 7 is lowered to the lowest point; at this time, the detection unit 6 is just at the specified depth in the molten steel. The middle position refers to a point between the starting position and the end position, and when the mobile platform 7 moves to this position, it is decelerated.

[0048] That is to say, when the mobile platform 7 is descending, when the limit switch 8 at the middle position senses the mobile platform 7, that is, when the mobile platform 7 descends to the middle position, the mobile platform 7 starts to decelerate through the variable frequency motor reducer. When the mobile platform 7 continues to descend to the end position, the mobile platform 7 stops at this position.

[0049] Specifically in this embodiment, there are four limit switches 8, one at the starting position, one at the end position, and two at the middle position. Among them, two limit switches 8 are used for deceleration and stop control during the descent of the mobile platform 7; the other two are used for deceleration and stop control during the lifting of the mobile platform 7.

[0050] In addition, it should be noted that the cam clutch 22 and the torque plate 24 in this embodiment are purchased directly from the market, and their specific structures and working principles are all existing technologies.

[0051] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A chain lifting mechanism, comprising a driving sprocket assembly (1), a driven sprocket assembly (2) and a transmission chain (3), characterized in that: The driven sprocket assembly (2) comprises a driven sprocket (21), which is sleeved on a driven sprocket shaft (23) via a cam clutch (22) inside the driven sprocket (21), and a torque plate (24) is also provided on the driven sprocket shaft (23).

2. A chain lifting mechanism according to claim 1, characterized in that: The driven sprocket shaft (23) is rotatably arranged in the bearing seat (25).

3. A chain lifting mechanism according to claim 2, characterized in that: The cam clutch (22) and the driven sprocket shaft (23), as well as the torque plate (24) and the driven sprocket shaft (23) are matched with keyways.

4. A chain lifting mechanism according to any one of claims 1 to 3, characterized in that: The driving sprocket assembly (1) comprises a driving source (11) and a driving sprocket (12) connected to the output end of the driving source (11); wherein the driving source (11) is a variable frequency motor reducer, and the variable frequency motor reducer is equipped with an incremental encoder.

5. A chain lifting mechanism according to claim 4, characterized in that: The transmission chain (3) is equipped with a tensioning wheel (4).

6. An automatic sampling device, comprising a frame (5) and a detection unit (6), characterized in that: The frame (5) is provided with a chain lifting mechanism as described in any one of claims 1 to 5, and the chain lifting mechanism is used to drive the detection unit (6) to move up and down; wherein the driving sprocket assembly (1) is arranged at the bottom of the frame (5), and the driven sprocket assembly (2) is arranged at the top of the frame (5).

7. An automatic sampling device according to claim 6, characterized in that: A movable platform (7) is slidably disposed on the frame (5), and the detection unit (6) is arranged on the movable platform (7).

8. An automatic sampling device according to claim 7, characterized in that: The frame (5) is provided with at least three limit switches (8) along its height direction, which are respectively located at the starting position, the end position and the middle position of the mobile platform (7); wherein the starting position and the end position are the moving stop positions of the mobile platform (7), and the middle position is the moving deceleration position of the mobile platform (7).

9. An automatic sampling device according to claim 8, characterized in that: Four limit switches (8) are provided.

10. An automatic sampling device according to claim 6, characterized in that: The detection unit (6) is any one of a temperature measurement sampling device, an emergency top blowing device, a wire feeding guide device or a nitrogen blowing gun stirring device.

Images