Pneumatic decrement scale

Abstract

The utility model discloses a pneumatic decrement scale which comprises a stock bin, a stirring assembly located in the stock bin, a driving shaft connected with a stirring shaft of the stirring assembly and a driving air cylinder connected with the driving shaft through a connecting rod. The output end of the driving cylinder is hinged with one end of the connecting rod; the other end of the connecting rod is fixed with the driving shaft; the stirring assembly comprises a stirring shaft and a plurality of scraping plates which are circumferentially distributed in the stock bin, the scraping plates and the stirring shaft rotate synchronously, and the maximum central angle between every two adjacent scraping plates is smaller than or equal to the maximum rotating angle of the driving shaft. The driving air cylinder with low cost is adopted as a driving source, the telescopic motion of the driving air cylinder is converted into the rotating motion of the driving shaft through the connecting rod, and meanwhile the central angle between every two adjacent scraping plates is reasonably arranged, so that the driving shaft only rotates in the arc range, and the cleaning of the inner wall of the stock bin in the whole circumferential direction can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of material conveying, in particular to a pneumatic reduction scale. Background Art

[0002] Loss-in-weight scales are used for continuous batching of small-flow particles or powders such as cement, coal powder, carbon powder, fly ash, mineral powder, and various bulk or liquid continuous batching. The screw conveyor speed is controlled according to the weight reduction rate of the material in the weighing bucket to achieve the purpose of quantitative feeding.

[0003] A stirring rod is provided inside the reduction-in-weight scale to stir the material to prevent the material from settling or adhering to the wall of the cylinder. Usually, the stirring rod is directly driven to rotate by a motor, but the cost of using the motor is high, and the motor needs to drive the stirring rod to rotate reciprocatingly, so the motor needs to have the function of reversing rotation, which not only increases the cost, but also reduces the service life of the motor.

[0004] Therefore, it is necessary to design a weight-reducing scale with low use cost and capable of meeting the mixing requirements. Utility Model Content

[0005] In order to solve the technical problem that the prior art weight loss scale uses a high-cost motor with a reversing function to drive the stirring rod to rotate, resulting in high cost and short motor life, the utility model provides a pneumatic weight loss scale to solve the above problem.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a pneumatic reduction scale, including a silo, a stirring assembly located in the silo, a driving shaft connected to the stirring shaft of the stirring assembly, and a driving cylinder connected to the driving shaft through a connecting rod; the output end of the driving cylinder is hinged to one end of the connecting rod, and the other end of the connecting rod is fixed to the driving shaft; the stirring assembly includes a stirring shaft and a plurality of scrapers distributed circumferentially inside the silo, the scrapers rotate synchronously with the stirring shaft, and the maximum center angle between adjacent scrapers is less than or equal to the maximum rotation angle of the driving shaft.

[0007] Furthermore, the drive shaft includes a first sealing section, a connecting section and a second sealing section which are axially connected, the first sealing section is connected to the stirring shaft, and the drive shaft is provided with a sealing cover, a bearing box and a bearing cover which are fixed in sequence along the axial direction, the sealing cover is fixedly connected to the silo, bearings are provided at both ends of the connecting section and are rotatably connected to the bearing box, the connecting rod is connected to the connecting section between the two bearings, and the bearing box has an arc-shaped opening for the connecting rod to pass through.

[0008] Furthermore, one end of the connecting rod is provided with a support ear hinged to the output end of the driving cylinder, and the other end is provided with a sleeve sleeved on the outer circumference of the driving shaft, and the sleeve is relatively fixed to the driving shaft.

[0009] Furthermore, the sleeve is connected to the drive shaft via a spline.

[0010] Furthermore, the outer circumferential surface of the drive shaft is provided with a keyway, and the inner circumferential surface of the sleeve is provided with a protrusion inserted into the keyway.

[0011] Furthermore, annular grooves are provided on the outer peripheral surface of the drive shaft at both ends of the sleeve, and the retaining springs are arranged in the annular grooves and abut against the axial ends of the sleeve.

[0012] Furthermore, a cylinder bracket is provided on the top of the silo, a guide block is hinged on the cylinder bracket, an axially extending guide rod is provided on the outer periphery of the driving cylinder, and the guide block is coaxially fixed with the guide rod.

[0013] Furthermore, the cylinder bracket is a frame-shaped structure for the output end of the driving cylinder to pass through, and support plates are provided at the upper and lower ends of the cylinder bracket. The guide block is hinged between the two support plates, and the guide block is sleeved on the outer circumference of the driving cylinder.

[0014] Furthermore, there are 3 to 6 scraper blades arranged in a circular array.

[0015] Furthermore, one end of the sealing cover is fixedly connected to the bearing box, and the other end of the sealing cover is provided with a sealing inner ring. The radial gap between the sealing inner ring and the drive shaft is filled with sealing filler. The surface of the sealing cover is also provided with an inspection window, and a cover plate covers the inspection window.

[0016] Furthermore, a discharge port is provided at the bottom of the silo, and a distance d between the lower end surface of the stirring shaft and the upper end surface of the discharge port is 0 to 2 cm.

[0017] The beneficial effects of the utility model are:

[0018] (1) The pneumatic reduction scale described in the utility model adopts a relatively low-cost driving cylinder as a driving source, and converts the telescopic movement of the driving cylinder into the rotational movement of the driving shaft through a connecting rod. At the same time, by reasonably setting the center angle between adjacent scrapers, the driving shaft only needs to rotate within the arc range to meet the cleaning of the entire circumferential direction of the inner wall of the silo.

[0019] (2) The utility model uses a sealing cover, a bearing box and a bearing cover to seal the drive shaft to ensure the sealing effect of the transmission process. At the same time, an inspection window is provided on the sealing cover to facilitate the inspection of the bearing connection part and the sealing part of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a front view of a specific implementation of the pneumatic reduction scale described in the utility model;

[0022] Figure 2 yes Figure 1 AA section view;

[0023] Figure 3 yes Figure 1 BB section view;

[0024] Figure 4 yes Figure 2 The enlarged image at a in the middle;

[0025] Figure 5 yes Figure 1 Enlarged view of point b in the middle;

[0026] Figure 6 It is a schematic diagram of the installation structure of the driving cylinder in the utility model;

[0027] Figure 7 It is a schematic diagram of the position relationship between the stirring shaft and the discharge port in a specific implementation manner of the utility model.

[0028] In the figure, 1, silo, 2, stirring assembly, 201, stirring shaft, 202, scraper, 3, drive shaft, 301, first sealing section, 302, connecting section, 303, second sealing section, 4, connecting rod, 401, support ear, 402, sleeve, 5, drive cylinder, 6, discharge port, 7, feed port, 8, cylinder bracket, 9, guide block, 10, guide rod, 11, support plate, 12, sealing cover, 1201, sealing inner ring, 1202, maintenance window, 13, bearing box, 1301, arc opening, 14, bearing cover, 15, bearing, 16, sealing packing, 17, cover plate, 18, sealing ring, 19, pressure plate, 20, retaining ring, 21, annular groove. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] like Figure 1-Figure 3 As shown, a pneumatic reduction scale includes a silo 1, which is approximately a conical structure, with a discharge port 6 at the bottom and a feed port 7 at the top. A stirring assembly 2 is provided in the silo 1, and the stirring assembly 2 includes a stirring shaft 201 and a scraper 202 driven to rotate by the stirring shaft 201. A plurality of scrapers 202 are arranged on the circumference of the silo 1 and are arranged close to the inner wall of the silo 1. The materials attached to the inner wall of the silo 1 can be scraped off during the rotation process.

[0031] The stirring shaft 201 is located at the center of the silo 1. The top of the stirring shaft 201 is connected to the driving shaft 3. The driving shaft 3 passes through the top plate of the silo 1 and is connected to the driving cylinder 5. The driving cylinder 5 outputs reciprocating linear motion. The connecting rod 4 is fixed on the driving shaft 3. Through the hinge between the connecting rod 4 and the driving cylinder 5, the linear motion of the driving cylinder 5 is converted into the rotational motion of the driving shaft 3. Since the driving cylinder 5 moves on one side of the driving shaft 3, the driving cylinder 5 can only drive the driving shaft 3 to rotate within a local arc area. In order to ensure that the scraper 202 can scrape the entire circumferential inner wall of the silo 1, the maximum center angle between adjacent scrapers 202 is less than or equal to the maximum rotation angle of the driving shaft 3. In order to ensure structural symmetry, the scrapers 202 are usually arranged in a circular array. The rotation angle of the driving shaft 3 is often between 50° and 80°. Therefore, the number of scrapers 202 is preferably 3 to 6.

[0032] Installation of driving cylinder 5:

[0033] like Figure 5 and Figure 6 As shown, a cylinder bracket 8 is provided on the top of the silo 1, a guide block 9 is hinged on the cylinder bracket 8, an axially extending guide rod 10 is provided on the outer periphery of the driving cylinder 5, and the guide block 9 is coaxially fixed with the guide rod 10. Firstly, through the hinge connection between the cylinder bracket 8 and the guide block 9, when the hinge point between the driving cylinder 5 and the connecting rod 4 rotates around the driving shaft 3, the driving cylinder 5 can make a corresponding rotational movement to adjust the position. Secondly, the setting of the guide rod 10 can connect the guide block 9 with the cylinder body of the driving cylinder 5, and at the same time ensure the coaxiality of the cylinder body of the driving cylinder 5 and the piston rod, so as to avoid the piston rod rubbing against the inner wall of the cylinder body.

[0034] Specifically, the cylinder bracket 8 is a frame-shaped structure for the output end of the driving cylinder 5 to pass through, and support plates 11 are provided at the upper and lower ends of the cylinder bracket 8. The guide block 9 is hinged between the two support plates 11, and the guide block 9 is sleeved on the outer periphery of the driving cylinder 5.

[0035] Since the driving cylinder 5 in the utility model is located on one side of the driving shaft 3, the driving shaft 3 will be completely exposed to the outside. In order to prevent impurities from entering the silo 1 through the driving shaft 3, a sealing or dustproof design is required outside the driving shaft 3. The utility model can be but is not limited to the following sealing design:

[0036] like Figure 3 and Figure 4As shown, the drive shaft 3 includes a first sealing section 301, a connecting section 302 and a second sealing section 303 connected axially, the first sealing section 301 is connected to the stirring shaft 201, and the drive shaft 3 is provided with a sealing cover 12, a bearing box 13 and a bearing cover 14 fixed in sequence along the axial direction. The sealing cover 12 is fixedly connected to the silo 1, and bearings 15 are provided at both ends of the connecting section 302 and are rotatably connected to the bearing box 13. The connecting rod 4 is connected to the connecting section 302 located between the two bearings 15, and the bearing box 13 has an arc-shaped opening 1301 for the connecting rod 4 to pass through. The first sealing section 301, the connecting section 302 and the second sealing section 303 adopt a stepped shaft structure, that is, the diameter of each section is different, and the axial limit of the bearings 15 at both ends is achieved by changing the end diameter.

[0037] The sealing cover 12 seals the connection position between the first sealing section 301 and the silo 1 to prevent impurities from entering the silo 1. The bearing box 13 is used to protect and install the bearing 15. The arc-shaped opening 1301 can provide a rotation space for the connecting rod 4. The bearing cover 14 is covered outside the second sealing section 303 to completely wrap the drive shaft 3.

[0038] In a further design, one end of the sealing cover 12 is fixedly connected to the bearing box 13, and the other end of the sealing cover 12 is provided with a sealing inner ring 1201. The radial gap between the sealing inner ring 1201 and the drive shaft 3 is filled with a sealing filler 16, which can be a packing. A sealing ring 18 and a pressure plate 19 are respectively fixed at both ends of the sealing inner ring 1201 to limit the sealing filler 16 between the two. The surface of the sealing cover 12 is also provided with an inspection window 1202, and the cover plate 17 covers the inspection window 1202. The inspection window 1202 allows the internal components to be inspected without removing the sealing cover 12, such as regularly replacing the sealing filler 16.

[0039] The structure of connecting rod 4:

[0040] One end of the connecting rod 4 is provided with a lug 401 hinged to the output end of the driving cylinder 5, and the other end is provided with a sleeve 402 sleeved on the outer circumference of the driving shaft 3, and the sleeve 402 is relatively fixed to the driving shaft 3. The relative fixation includes axial relative fixation and circumferential relative fixation. The circumferential relative fixation of the two can be achieved by the cooperation of splines or keyways and protrusions. The size of the reduction scale in this embodiment is small, so only a protrusion (also called a flat key) is needed for limiting. When the size of the reduction scale is large, spline circumferential limiting is often used. Figure 3 As shown, the outer circumference of the drive shaft 3 is provided with a keyway, and the inner circumference of the sleeve 402 is provided with a convex block inserted into the keyway; the axial relative fixation of the sleeve 402 and the drive shaft 3 can be achieved by the retaining springs 20 at both ends, as shown in FIG. Figure 4 As shown, the driving shaft 3 has two annular grooves 21 , and the retaining spring 20 is clamped in the annular grooves 21 and abuts against the axial ends of the sleeve 402 .

[0041] The stirring shaft 201 is located at the center of the silo 1. In the conventional stirring assembly, the height of the stirring shaft 201 is close to the height of the scraper 202, and the distance between the stirring shaft 201 and the discharge port 6 is large. When the bottom of the silo 1 is directly connected to the screw conveyor, the material is easily blocked at the discharge port 6. Therefore, the present invention makes the following further improvements: Figure 7 As shown, the distance d between the lower end surface of the stirring shaft 201 and the upper end surface of the discharge port 6 is 0-2 cm, which reduces the distance between the stirring shaft 201 and the discharge port 6, and the material can be stirred near the discharge port 6 to achieve an arch-breaking effect.

[0042] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inner", "outer", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 a limitation on the present invention.

[0043] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present utility model, unless otherwise specified, "plurality" and "several" mean two or more.

[0044] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0045] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pneumatic reduction scale, characterized in that: It comprises a silo (1), a stirring assembly (2) located in the silo (1), a driving shaft (3) connected to a stirring shaft (201) of the stirring assembly (2), and a driving cylinder (5) connected to the driving shaft (3) via a connecting rod (4); The output end of the driving cylinder (5) is hinged to one end of the connecting rod (4), and the other end of the connecting rod (4) is fixed to the driving shaft (3); the stirring assembly (2) comprises a stirring shaft (201) and a plurality of scrapers (202) distributed circumferentially inside the silo (1); the scrapers (202) rotate synchronously with the stirring shaft (201), and the maximum center angle between adjacent scrapers (202) is less than or equal to the maximum rotation angle of the driving shaft (3).

2. The pneumatic weight loss scale according to claim 1, characterized in that: The drive shaft (3) comprises a first sealing section (301), a connecting section (302) and a second sealing section (303) which are axially connected to each other. The first sealing section (301) is connected to the stirring shaft (201). The drive shaft (3) is provided with a sealing cover (12), a bearing box (13) and a bearing cover (14) which are fixed in sequence along the axial direction. The sealing cover (12) is fixedly connected to the silo (1). Bearings (15) are provided at both ends of the connecting section (302) and are rotatably connected to the bearing box (13). The connecting rod (4) is connected to the connecting section (302) located between the two bearings (15), and the bearing box (13) has an arc-shaped opening (1301) for the connecting rod (4) to pass through.

3. The pneumatic weight loss scale according to claim 1, characterized in that: One end of the connecting rod (4) is provided with a support ear (401) hinged to the output end of the driving cylinder (5), and the other end is provided with a sleeve (402) sleeved on the outer circumference of the driving shaft (3), and the sleeve (402) is relatively fixed to the driving shaft (3).

4. The pneumatic weight loss scale according to claim 3, characterized in that: The sleeve (402) is connected to the drive shaft (3) via a spline.

5. The pneumatic weight loss scale according to claim 1, characterized in that: The outer circumferential surface of the drive shaft (3) is provided with a keyway, and the inner circumferential surface of the sleeve (402) is provided with a protrusion inserted into the keyway.

6. The pneumatic weight loss scale according to claim 1, characterized in that: The outer circumferential surface of the drive shaft (3) at both ends of the sleeve (402) is provided with an annular groove (21), and the retaining spring (20) is arranged at the annular groove (21) and abuts against the axial ends of the sleeve (402).

7. The pneumatic weight loss scale according to claim 1, characterized in that: A cylinder support (8) is also provided on the top of the silo (1), a guide block (9) is hingedly connected to the cylinder support (8), an axially extending guide rod (10) is provided on the outer periphery of the driving cylinder (5), and the guide block (9) is coaxially fixed with the guide rod (10).

8. The pneumatic weight loss scale according to claim 7, characterized in that: The cylinder bracket (8) is a frame-shaped structure for the output end of the driving cylinder (5) to pass through, and the upper and lower ends of the cylinder bracket (8) are both provided with support plates (11), the guide block (9) is hinged between the two support plates (11), and the guide block (9) is sleeved on the outer periphery of the driving cylinder (5).

9. The pneumatic weight loss scale according to claim 1, characterized in that: A discharge port (6) is provided at the bottom of the silo (1), and a distance d between a lower end surface of the stirring shaft (201) and an upper end surface of the discharge port (6) is 0 to 2 cm.

10. The pneumatic weight loss scale according to claim 2, characterized in that: One end of the sealing cover (12) is fixedly connected to the bearing box (13), and the other end of the sealing cover (12) is provided with a sealing inner ring (1201). A sealing filler (16) is filled between the radial gap between the sealing inner ring (1201) and the drive shaft (3). The surface of the sealing cover (12) is also provided with an inspection window (1202), and a cover plate (17) covers the inspection window (1202).

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