An automatic lifting frame applied in the process of sampling of electrically calcined coal

Abstract

The application provides an automatic lifting frame applied in an electric calcination coal sampling process, which is closely arranged on a classifier, and the automatic lifting frame comprises a bearing frame, the bearing frame comprises a positioning side wall and a first mounting side wall, a chain conveying device, a U-shaped plate, a material conveying part, a roller assembly and a limiting arm, the limiting arm is provided with a U-shaped cavity, and the extending direction of the U-shaped cavity forms an angle of 25-40 degrees with a horizontal plane. The bearing frame is provided to serve as a mounting base, the vertical chain conveying device drives the U-shaped plate to move in a vertical direction, and then drives the material conveying part to convey the sample, along with the rising of the material conveying part, the U-shaped cavity of the limiting arm forming an angle of 25-40 degrees with the horizontal plane is clamped with the roller assembly, the material conveying part is forced to rotate around the rotating shaft, the sample raw material is automatically turned over and poured, and the problem that the material bucket has a too small turning angle and is stuck and left due to the lifting guide frame arranged in a small space and in an inclined mode is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of electric calcined coal sampling, and in particular to an automatic lifting frame used in the electric calcined coal sampling process. Background Technology

[0002] Sampling of electrically calcined coal is a key step in coal quality testing. The equipment required covers multiple steps such as sampling, crushing, reduction, weighing, and drying. In particular, the reduction step, as a key step in the coal sample preparation process, refers to reducing the mass of the coal sample through standardized operations while maintaining its representativeness, so as to meet the needs of subsequent analysis or testing.

[0003] In practical applications, on-site material reduction is required in the production area. Due to limitations of the existing production area, the space is insufficient to support the installation of more convenient material reduction equipment. This results in the material inlet height of the material reducer being far beyond the comfortable operating range of normal operators. Personnel must climb the platform to manually lift approximately 25kg of material to the material inlet of the material reducer, which is about 1.7 meters high, in order to complete the material feeding. This leads to a heavy workload for personnel, low efficiency, and safety hazards due to the confined space.

[0004] A utility model patent, titled "A Material Bucket Elevator," with publication number CN214570399U, is disclosed in the prior art. In this patent, the drive wheel assembly of the lifting device moves a trolley along a lifting guide frame via a chain assembly. When the trolley carrying the material bucket reaches the bifurcation of the double tracks in the middle of the elevator body, it is transferred to the discharge port position via a track transition plate. At this point, the material bucket automatically tilts due to gravity or changes in the track's tilt angle, and the guide chute further controls the material's falling range, completing the automatic unloading process.

[0005] However, the automatic material unloading system described in the patent application has a design flaw: when the trolley tilts over the track transition plate, an inclined lifting guide frame is used to increase the tilting angle and avoid material residue. However, the inclined arrangement of the lifting guide frame restricts its installation in confined production areas, resulting in the trolley not being able to tilt completely at the track transition plate joint, leading to frequent jamming of residual material. This residual material mixes into subsequent production batches, causing samples to lose their representativeness and ultimately seriously affecting the accuracy of test results. Utility Model Content

[0006] The purpose of this invention is to solve the problem in the existing technology where the automatic material unloading system, due to the design of the inclined arrangement of the lifting guide frame to increase the tilting angle, is limited in installation in narrow spaces, resulting in incomplete tilting of the trolley and material residue.

[0007] To achieve the above objectives, this application proposes an automatic lifting frame for use in the sampling process of electrically calcined coal, which is installed close to the reducer. The automatic lifting frame includes: A support frame, the support frame including: a positioning sidewall opposite to the side of the divider, and a first mounting sidewall adjacent to the positioning sidewall; Also includes: A chain conveyor device mounted vertically on the support frame; A U-shaped plate rigidly connected to the chain of the chain conveyor device; Material conveying section hinged to the U-shaped plate; A roller assembly is disposed on the positioning sidewall near the top end face; A limiting arm is fixed to the side wall of the material conveying part and fitted into the roller assembly to achieve flipping. The limiting arm is equipped with a U-shaped cavity with an opening facing the roller assembly. The extension direction of the U-shaped cavity forms an angle of 25°-40° with the horizontal plane.

[0008] This application provides a support frame to serve as an installation base. A vertical chain conveyor drives a U-shaped plate to move vertically, which in turn drives the material conveying unit to convey the sample. As the material conveying unit rises, the U-shaped chamber of the limiting arm, which forms an angle of 25°-40° with the horizontal plane, engages with the roller assembly, forcing the material conveying unit to rotate around the axis. This achieves automatic tilting and dumping of the sample raw material, avoiding the problem of material jamming and residue caused by the tilted lifting guide frame arranged in a confined space, which results in an excessively small tilting angle of the material bucket.

[0009] Furthermore, in order to install the roller assembly, the roller assembly includes: a mounting base mounted on the positioning sidewall; a shaft fixed to the mounting base and extending in a horizontal direction away from the positioning sidewall; and a roller hinged to the end of the shaft away from the positioning sidewall.

[0010] Furthermore, in order to reduce the impact when the U-shaped cavity engages with the roller, the opening width of the U-shaped cavity is 1.1-1.3 times the diameter of the roller, and maintains a gap of ≥5mm with the roller when not tilted.

[0011] Furthermore, in order to improve the stability when the roller engages with the end of the limiting arm, the end of the limiting arm away from the rotating shaft is provided with a gradually expanding chamfer along the opposite direction.

[0012] Furthermore, in order to save space and prevent the chain conveyor from being impacted by dust, the support frame is configured as a hollow cavity, and the chain conveyor is located inside the hollow cavity.

[0013] Furthermore, in order to realize the material conveying, the material conveying unit includes: a rotating shaft arranged in the horizontal direction and rotatably connected to the end face of the U-shaped plate; a base fixedly connected to the rotating shaft; and a material conveying barrel welded to the top of the base.

[0014] Furthermore, in order to improve the stability of the U-shaped plate when it moves in the vertical direction, a guide rail extending in the vertical direction is provided on the first mounting side wall. The open end of the U-shaped plate is inserted into the guide rail and engaged with the chain conveying device, and the closed end of the U-shaped plate is hinged to the material conveying part.

[0015] Furthermore, in order to limit the material conveying section and prevent it from hitting the top or bottom, the end face of the bearing frame opposite to the positioning side wall is configured as a second mounting side wall, and the end face opposite to the first mounting side wall is configured as a third mounting side wall; a limit switch is provided at the top of the second mounting side wall; a proximity switch is provided at the bottom of the second mounting side wall; and a control box is provided on the third mounting side wall to connect the limit switch and the proximity switch.

[0016] Furthermore, in order to adjust the mounting height of the limit switch and the proximity switch, the top and bottom of the second mounting sidewall are respectively provided with equal-spaced adjusting screw holes in the vertical direction. The bases of the limit switch and the proximity switch are mounted on the adjusting screw holes by bolt fasteners to adjust the mounting position.

[0017] The beneficial effects of this application are as follows: 1. This application provides a support frame to serve as an installation base. A vertical chain conveyor drives a U-shaped plate to move vertically, which in turn drives the material conveying unit to convey the sample. As the material conveying unit rises, the U-shaped chamber of the limiting arm, which forms an angle of 25°-40° with the horizontal plane, engages with the roller assembly, forcing the material conveying unit to rotate around the pivot. This achieves automatic tilting and dumping of the sample raw material, avoiding the problem of material jamming and residue caused by the tilted lifting guide frame in a confined space, which results in an excessively small tilting angle of the material bucket.

[0018] 2. The U-shaped cavity of the limiting arm in this application is clearance-fitted with the roller, and a gradually expanding chamfer is provided at the end to improve the stability during the fitting process of the roller and the U-shaped cavity, and to prevent the material in the material conveying bucket from spilling out.

[0019] 3. This application incorporates the chain conveyor device into the hollow cavity of the supporting frame, which significantly improves the space utilization of the narrow work site through the space-intensive layout, and effectively prevents dust from escaping into the air during material conveying, thereby extending the service life of the equipment and ensuring its operational reliability.

[0020] 4. This application includes limit switches and proximity switches to prevent the material conveying unit from hitting the top or bottom during transportation.

[0021] 5. This application achieves dual switch position adjustment function by setting adjustment screw holes. It can not only adapt to the installation requirements of the divider of different heights by adjusting the height of the limit switch, but also allow the operator to flexibly adjust the position of the proximity switch according to the individual height difference, thereby optimizing the operating posture when adding samples and effectively reducing operator fatigue. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an automatic lifting frame used in the sampling process of electrically calcined coal according to an embodiment of this application; Figure 2 This is a schematic diagram showing the state of the material conveying unit being flipped in an embodiment of this application; Figure 3 for Figure 2 Enlarged view of point a in the middle; Figure 4 This is a schematic diagram showing the installation position of the roller assembly in an embodiment of this application; Figure 5 for Figure 4 Enlarged view at point b in the middle; Figure 6 This is a schematic diagram of another state in which the material conveying unit is flipped in an embodiment of this application; Figure 7 This is a schematic diagram of the chain conveyor device in the embodiments of this application.

[0024] Explanation of reference numerals in the attached figures: 1. Reducing unit; 2. Support frame; 21. Positioning sidewall; 22. First mounting sidewall; 23. Second mounting sidewall; 24. Third mounting sidewall; 201. Hollow cavity; 3. Chain conveyor device; 4. U-shaped plate; 5. Material conveying section; 51. Rotating shaft; 52. Base; 53. Material conveying drum; 6. Roller assembly; 61. Mounting base; 62. Shaft; 63. Roller; 7. Limit arm; 71. U-shaped cavity; 8. Guide rail; 9. Limit switch; 10. Proximity switch; 11. Control box; 12. Trigger plate; 13. Adjusting bolt. Detailed Implementation

[0025] The following will be combined with the appendix Figures 1-7 The embodiments of the technical solutions of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solutions of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0026] Implementation Method 1 like Figures 1-7 This illustration depicts an automatic lifting frame used in the sampling process of electrically calcined coal. To achieve automatic material tilting and unloading while saving space, the automatic lifting frame is installed close to the distributor 1. The automatic lifting frame includes: a support frame 2, a chain conveyor 3, a U-shaped plate 4, and a material conveying section 5. The positioning sidewall 21 of the support frame 2 faces the side of the distributor 1, and the first mounting sidewall 22 is adjacent to the positioning sidewall 21. The chain conveyor 3 is vertically positioned within the hollow cavity 201 of the support frame 2, and its chain is rigidly connected to the U-shaped plate 4. The open end of the U-shaped plate 4 is inserted into the vertical guide rail 8 of the first mounting sidewall 22 and engages with the chain; the closed end is hinged to the material conveying section 5. The material conveying section 5 is rotatably connected to the U-shaped plate 4 via a rotating shaft 51, and a material conveying bucket 53 is welded to the base 52. When the chain conveyor 3 is activated, the U-shaped plate 4 rises along the guide rail 8, causing the entire material conveying section 5 to be vertically lifted. When the material conveying section 5 rises to the top of the positioning sidewall 21, the limiting arm 7, fixed to the sidewall of the material conveying section 5, enters the working state: its U-shaped cavity 71 opens towards the roller assembly 6. As it continues to rise, the inclined surface of the U-shaped cavity 71 (forming an angle of 25°-40° with the horizontal plane) gradually contacts the roller 63 of the roller assembly 6. At this time, the inclined structure of the U-shaped cavity 71 generates a lateral thrust on the roller 63, forcing the material conveying section 5 to rotate around the pivot 51, ultimately causing the material conveying bucket 53 to flip over to the top of the feed inlet of the divider 1 to complete the tilting. This vertical lifting and tilting limiting arm design avoids the space occupation problem caused by traditional tilting tracks, ensures a ≥90° tilting angle in confined spaces, and completely solves the problem of material residue jamming.

[0027] Implementation Method 2 like Figure 2-3 As shown, in order to improve the stability of the flipping, as a preferred solution, the opening width of the U-shaped cavity 71 of the limiting arm 7 is designed to be 1.1-1.3 times the diameter of the roller 63, and maintains a gap of ≥5mm with the roller 63 when not tilting. The gap fit between the U-shaped cavity 71 and the roller 63 can reserve space when the two are initially locked together, preventing the U-shaped cavity 71 and the roller 63 from having a hard impact, which would cause the material in the material bucket conveying bucket 53 to spill out.

[0028] Specifically, when the material conveying unit 5 rises to the working position, the roller 63 first enters the opening end of the U-shaped cavity 71. At this time, the gradually expanding chamfered structure guides the roller 63 to smoothly transition to the bottom of the U-shaped cavity 71. Since the extension direction of the U-shaped cavity 71 forms an angle of 25°-40° with the horizontal plane, during the continuous rising process, the roller 63 moves along the inclined surface of the U-shaped cavity 71, generating a stable lateral force. This clearance fit design avoids accidental contact in the non-working state and ensures that the roller 63 maintains continuous contact with the inner wall of the U-shaped cavity 71 during the flipping process, preventing material spillage due to impact. At the same time, the gradually expanding chamfered structure at the end of the limiting arm 7 further expands the fault tolerance range when the roller 63 enters the U-shaped cavity 71, ensuring reliable engagement even with installation errors or vibrations.

[0029] Implementation Method 3 like Figure 1 and Figure 7 As shown, to achieve space saving and dust prevention, the supporting frame 2 adopts a hollow chamber 201 structure, and the chain conveyor 3 is completely built into the cavity. The vertical guide rail 8 of the first mounting side wall 22 forms a sliding fit with the open end of the U-shaped plate 4, which not only ensures the vertical lifting accuracy, but also effectively blocks the dust generated during the material conveying process through the closed structure. Even if a small amount of material is spilled, it is isolated outside the hollow chamber 201 to prevent dust from causing the material conveyor to jam. At the same time, this space-saving design reduces the overall width of the equipment to 60% of the traditional inclined track scheme, which is particularly suitable for work sites with limited space, such as wellheads or workshops.

[0030] Implementation Method 4 like Figure 4-6 As shown, to limit the movement of the material conveyor 53 and prevent it from overshooting during sample transport or hitting the bottom during reset, a limit switch 9 is installed at the top of the second mounting sidewall 23, and a proximity switch 10 is installed at the bottom. These two switches form a double-safety control system via a control box 11. When the material conveyor 5 rises to its highest point, the arc surface of the trigger plate 12 strikes the limit switch 9, immediately cutting off the upward power of the chain conveyor 3. When it descends to its lowest point, the proximity switch 10 detects the signal from the trigger plate 12 and stops the chain conveyor 3 from continuing to descend. This dual-limit design ensures that the material conveyor 5 always moves within a safe travel range, avoiding mechanical collisions caused by control system malfunctions. Simultaneously, the vertical adjustment screw hole 13 on the second mounting sidewall 23 allows for adjustment of the mounting height of the limit switch 9 and the proximity switch 10 using bolt fasteners, adapting to the installation requirements of the divider 1 at different heights.

[0031] As a preferred solution, this application uses the Chint YBLX-ME / 8180 limit switch 9 and the Omron E2E-X14MD1 proximity switch 10. The electrical control logic diagram of the limit switch 9, proximity switch 10 and control box 11 is used as prior art. The electrical connection method can be obtained by referring to the sample manual, and will not be described in detail here.

[0032] Furthermore, the control box 11 on the third mounting side wall 24 integrates the signal processing units for the limit switch 9 and the proximity switch 10. Operators can adjust the mounting position of the proximity switch 10 according to their height using the adjusting screw hole 13 on the second mounting side wall 23. When shorter operators add samples, the proximity switch 10 can be lowered to a lower position, making the material conveying bucket 53 more easily accessible; conversely, taller operators can raise the proximity switch 10 to reduce bending. This adjustable design allows the equipment to adapt to different operating habits, reducing occupational fatigue caused by repetitive bending movements, while ensuring that the material conveying unit 5 completes the flipping action at the optimal working height, improving overall work efficiency.

[0033] In the description of the embodiments of this application, the technical terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set," "equipped with," "connected," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic lifting frame used in the sampling process of electric calcined coal, installed close to the divider (1), the automatic lifting frame comprising: The support frame (2) includes: a positioning sidewall (21) opposite to the side of the divider (1), and a first mounting sidewall (22) adjacent to the positioning sidewall (21). Its characteristic is that it also includes: A chain conveyor (3) is installed vertically on the support frame (2); U-shaped plate (4) rigidly connected to the chain of the chain conveying device (3); Material conveying section (5) hinged to the U-shaped plate (4); Roller assembly (6) is provided on the positioning sidewall (21) near the top end face; A limiting arm (7) is fixed to the side wall of the material conveying part (5) and fitted into the roller assembly (6) to achieve flipping. The limiting arm (7) is provided with a U-shaped cavity (71) with its opening facing the roller assembly (6). The extension direction of the U-shaped cavity (71) forms an angle of 25°-40° with the horizontal plane.

2. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The roller assembly (6) includes: a mounting base (61) mounted on the positioning sidewall (21); a shaft (62) fixed to the mounting base (61) and extending in a horizontal direction away from the positioning sidewall (21); and a roller (63) hinged to the end of the shaft (62) away from the positioning sidewall (21).

3. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 2, characterized in that, The opening width of the U-shaped cavity (71) is 1.1-1.3 times the diameter of the roller (63), and maintains a gap of ≥5mm with the roller (63) when not tilted.

4. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The end of the limiting arm (7) facing away from the rotating shaft (51) is set with a gradually expanding chamfer along the facing direction.

5. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The support frame (2) is configured as a hollow cavity (201), and the chain conveyor (3) is located inside the hollow cavity (201).

6. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The material conveying unit (5) includes: a rotating shaft (51) arranged in a horizontal direction and rotatably connected to the end face of the U-shaped plate (4); a base (52) fixedly connected to the rotating shaft (51); and a material conveying barrel (53) welded to the top of the base (52).

7. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The first mounting sidewall (22) is provided with a guide rail (8) extending in the vertical direction. The open end of the U-shaped plate (4) is inserted into the guide rail (8) and snapped into the chain conveyor (3). The closed end of the U-shaped plate (4) is hinged to the material conveying part (5).

8. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 1, characterized in that, The end face of the support frame (2) opposite to the positioning side wall (21) is configured as the second mounting side wall (23), and the end face opposite to the first mounting side wall (22) is configured as the third mounting side wall (24); a limit switch (9) is provided on the top of the second mounting side wall (23); a proximity switch (10) is provided on the bottom of the second mounting side wall (23); a control box (11) is provided on the third mounting side wall (24) to connect the limit switch (9) and the proximity switch (10); a trigger plate (12) is provided on the side of the material conveying part (5) near the limit switch (9).

9. The automatic lifting frame used in the sampling process of electrically calcined coal according to claim 8, characterized in that, The top and bottom of the second mounting sidewall (23) are respectively provided with equal intervals of adjusting screw holes (13) in the vertical direction. The base of the limit switch (9) and the proximity switch (10) are mounted on the adjusting screw holes (13) by bolt fasteners to adjust the mounting position.

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