CN103434026B - Powder Weighing Devices and Mixing Stations for Mixing Stations - Google Patents

Abstract

The invention discloses a powder weighing device for a mixing station and the mixing station, the device comprises a connecting rod (3), a support plate (4) and a cantilever beam sensor (5), the support plate is connected with a weighing hopper of the mixing station and is connected to one end of the cantilever beam sensor through the vertically arranged connecting rod, the other end of the cantilever beam sensor is fixed on a mounting rack (2) of the mixing station, end spherical surfaces (31) are formed at two ends of the connecting rod, connecting rod accommodating cavities (11) with opposite positions are formed in the upper surface of the cantilever beam sensor and the bottom of the support plate respectively, and spherical wall surfaces (10) are formed in the connecting rod accommodating cavities to form spherical connection with the end spherical surfaces of the connecting rod. Therefore, even when the connecting rod inclines slightly, the stress point of the connecting rod acting on the cantilever beam sensor is still on the lowest point of the spherical wall surface of the accommodating cavity of the connecting rod, basically no change is generated, the stress is more uniform, and the weighing is more stable and the precision is higher.

Description

Powder Weighing Devices and Mixing Stations for Mixing Stations

technical field

The invention relates to a mixing station, in particular to a powder weighing device used on the mixing station and a mixing station with the powder weighing device.

Background technique

In the powder weighing of concrete mixing plants, cantilever beam sensors are generally used as weighing elements at present. Its working principle is based on the elastic deformation of the elastic body under the action of external force, so that the resistance strain gauge pasted on its surface also produces corresponding deformation. , so that the resistance value of the resistance strain gauge increases or decreases, and then the change of resistance is converted into an electrical signal such as voltage or current through the corresponding measurement circuit, and an electrical signal proportional to the load-bearing capacity of the cantilever beam sensor is output. The detection and conversion of the controller, so as to achieve the purpose of measuring the bearing capacity.

In the structure of a common powder weighing device as shown in Figure 1, the support plate 4 is connected to the weighing bucket (not shown in the figure) of the mixing station and connected to the cantilever beam sensor 5 through the vertically arranged connecting rod 3 One end is used to transmit the weight of the weighing bucket, and the other end of the cantilever beam sensor 5 is fixed on the mixing station installation frame 2 by fixing bolts 6 . The cantilever beam sensor 5 is generally a stainless steel elastic body, and a resistance strain gauge (not shown in the figure) is pasted on the surface of the elastic body. Since one end of the cantilever beam sensor 5 is fixed, and the other end is subjected to gravity from the weighing bucket, the cantilever beam is elastically deformed, causing the corresponding deformation of the resistance strain gauge, resulting in a change in the resistance value, and the electrical signal of the resistance value passes through the signal cable 7 It is transmitted to an external controller to finally measure and calculate the bearing capacity of the cantilever beam sensor 5 . Wherein, in order to keep the support plate 4 , its end is sheathed on the protection screw 1 . The bottom end of the protection screw 1 can be supported on the installation frame 2 of the mixing station, and the support plate 4 is connected to the protection screw 1 through the adjusting nut on the protection screw 1 and the height position can be adjusted. When the cantilever beam sensor 5 suddenly breaks unexpectedly, causing the support plate 4 to drop suddenly, the bottom end of the protection bolt 1 can be supported on the mixing station installation frame 2, so that the support plate 4 will not continue to fall.

It can be seen from FIG. 2 that both ends of the connecting rod 3 are square, and are inserted into corresponding square cavities installed on the bottom of the support plate 4 and the cantilever beam sensor 5 . The connecting rod 3 is not fixed during the working process, and is in movable contact with the cantilever beam sensor 5, and the two are in surface contact. In this way, it is difficult for the connecting rod 3 to maintain an ideal vertical state during the working process, and it is inevitable to incline when the force is deviated or vibrates. Once tilted, the stress point acting on the cantilever beam sensor 5 will change, resulting in a change in the bending deformation of the cantilever beam sensor 5, resulting in a weighing error. Therefore, how to structurally ensure the reasonable deformation of the cantilever beam sensor and the resistance strain gauge is the key to the weighing accuracy during the use of the powder weighing device.

Contents of the invention

The object of the present invention is to provide a powder weighing device used in a mixing station, and a mixing station with the powder weighing device. The powder weighing device has stable weighing and high precision.

In order to achieve the above object, the present invention provides a powder weighing device for a mixing station, the device includes a connecting rod, a support plate and a cantilever beam sensor, the support plate is connected with the weighing hopper of the mixing station and passed through a vertical A straight connecting rod is connected to one end of the cantilever beam sensor, and the other end of the cantilever beam sensor is fixed on the mixing station installation frame, wherein, both ends of the connecting rod are formed with end spherical surfaces, and the cantilever beam The upper surface of the sensor and the bottom of the support plate are respectively formed with opposite connecting rod receiving cavities, and a spherical wall is formed in the connecting rod receiving cavity to form a spherical connection with the end spherical surface of the connecting rod.

Preferably, the diameter of the spherical surface at the end of the connecting rod is the same as the maximum length of the connecting rod.

Preferably, the radius of the spherical wall in the receiving cavity of the connecting rod is the same as the radius of the spherical surface at the end of the connecting rod.

Preferably, the device further includes a sealing ring for sealing the receiving chamber of the connecting rod.

Preferably, lubricating oil is provided at least on the spherical wall surface in the connecting rod accommodation cavity.

Preferably, the device further includes a position-adjustable mounting plate mounted on the bottom of the support plate, and the connecting rod accommodation cavity is formed in the positioning mounting plate.

Preferably, the device further includes a controller for detecting the bearing capacity of the cantilever beam sensor, the cantilever beam sensor is an elastic metal rod, and the surface of the elastic metal rod is provided with a resistance strain gauge, and the controller is connected with the cantilever beam sensor. The resistance strain gauge is electrically connected.

Preferably, the device further includes a protective screw, the support plate is sleeved on the protective screw, and the bottom end of the protective screw can be supported on the installation frame of the mixing station.

Preferably, the device includes at least three cantilever beam sensors, the at least three cantilever beam sensors are arranged on the same height plane and support the weighing bucket through the connecting rod and the support plate respectively.

On the basis of the above, the present invention also provides a mixing station, which includes the powder weighing device for the mixing station according to the present invention.

According to the above technical solution, in the powder weighing device used in the mixing station according to the present invention, the connecting rod forms a spherical connection with the cantilever beam sensor and the support plate, so that even when the connecting rod tilts slightly, its The force point acting on the cantilever beam sensor is still at the lowest point of the spherical wall of the connecting rod receiving cavity, which basically does not change, or the force point generated when the connecting rod is tilted relative to the plane end The position change is small, and the force is more uniform, so that the weighing of the powder weighing device is more stable and the accuracy is higher.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the front view of the local structure of the powder material weighing device for mixing station according to the prior art;

Fig. 2 is an expanded view of parts of the connecting rod part in the local structure of the powder weighing device used for the mixing station shown in Fig. 1;

Fig. 3 is the front view of the partial structure of the powder material weighing device for mixing station according to the preferred embodiment of the present invention;

Fig. 4 is an expanded view of the parts of the partial structure of the powder weighing device for the mixing station shown in Fig. 3;

Fig. 5 is a sectional view of the positioning plate at the bottom of the support plate used in the powder weighing device of the mixing station shown in Fig. 3;

Fig. 6 is a schematic structural view of the cantilever beam sensor part in the powder weighing device used in the mixing station shown in Fig. 3, wherein a partial section is made to show the connecting rod accommodation cavity and the spherical wall surface;

Fig. 7 is a schematic diagram when the connecting rod in Fig. 3 is in a vertical state; and

Fig. 8 is a schematic diagram when the connecting rod in Fig. 7 is deviated at a certain angle from the vertical state.

Explanation of reference signs

1 Protection screw 2 2 Mounting bracket for mixing station

3 Connecting rod 4 Support plate

5 Cantilever Beam Sensor 6 Fixing Bolt

7 Signal cable 8 Sealing ring

9 Positioning mounting plate 10 Spherical wall

11 Connecting rod accommodation cavity 31 End spherical surface

H The maximum length of the connecting rod D The diameter of the spherical surface at the end

a Offset Angle R R Radius of spherical wall

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, unless stated to the contrary, the used orientation words such as "up, down, top, bottom" generally refer to the directions shown in the drawings or refer to the vertical, perpendicular or gravitational directions The terms used to describe the mutual positional relationship of the various components mentioned above.

As shown in Figures 3 and 4, the present invention provides a powder weighing device for a mixing station, the device includes a connecting rod 3, a support plate 4 and a cantilever beam sensor 5, the support plate 4 and the scale of the mixing station The measuring buckets are connected and connected to one end of a cantilever beam sensor 5 through a vertically arranged connecting rod 3 , and the other end of the cantilever beam sensor 5 is fixed on the installation frame 2 of the mixing station. Wherein, both ends of the connecting rod 3 are formed with end spherical surfaces 31, and the upper surface of the cantilever beam sensor 5 and the bottom of the support plate 4 are respectively formed with oppositely positioned connecting rod receiving chambers 11, and the connecting rod receiving chambers 11 are formed with The spherical wall surface 10 forms a spherical connection with the end spherical surface 31 of the connecting rod 3 . As a general inventive concept, in order to overcome the defect that the plane end structure of the connecting rod 3 shown in FIG. The connecting rod 3, the support plate 4 and the cantilever beam sensor 5 are respectively designed to form a spherical connection, so that even when the connecting rod 3 tilts slightly, the end spherical surface 31 slides on the spherical wall surface 10, but acts on the cantilever beam. The total stress point on the sensor 5 is still on the lowest point of the spherical wall of the connecting rod accommodation cavity, which basically does not change, or relative to the connecting rod at the end of the plane, the total force point generated when it is inclined The location changes are small and will be detailed below. Moreover, due to the uniform contact of the spherical surface, the force on the spherical wall surface 10 is more uniform, so that the weighing of the powder weighing device is more stable and the accuracy is higher.

Wherein, the radius R of the spherical wall surface 10 in the connecting rod accommodation chamber 11 shown in FIG. 5 or FIG. shift. Preferably, the two are equal in size, so that the end spherical surface 31 coincides with the spherical wall surface 10, and it is less likely to cause positional movement such as tilting. More preferably, as shown in Figure 7, the diameter D of the spherical surface 31 at the end of the connecting rod 3 is the same as the maximum length H of the connecting rod 3, that is, the connecting rod 3 is equivalent to the diameter of the entire sphere represented by the dotted line in Figure 7 part of it. In other words, gravity is transmitted between the support plate 4 and the cantilever beam sensor 5 through the ball, and the point of force acting on the cantilever beam sensor 5 is always the lowest point of the spherical wall surface 10 on the cantilever beam sensor 5 . Referring to Fig. 8, it can be seen that when the connecting rod 3 is tilted to the left by an angle a from the vertical state, when the offset range does not exceed the entire spherical wall surface 10, since the end spherical surfaces 31 at the upper and lower ends of the connecting rod 3 and the respective corresponding spherical wall surfaces 10 Still fit, the point of action of the vertically downward gravity on the spherical wall surface 10 on the cantilever beam sensor 5 is always the lowest point on the spherical wall surface 10, which is the end of the connecting rod 3 in the vertical state The midpoint of the spherical surface 31 . Therefore, the magnitude and direction of gravity remain unchanged, and the point of action of gravity on the cantilever beam sensor 5 remains unchanged, so that under a certain gravity, even if tilting or vibration occurs, the force-bearing end of the cantilever beam sensor 5 is fixed relative to its other end. The elastic deformation of the lever generated by the point (that is, the installation position of the fixing bolt 6 in Fig. 6 ) remains unchanged, which makes the measurement more accurate and stable.

In Fig. 5 or Fig. 6, at least lubricating oil should be kept on the spherical wall surface 10 in the connecting rod accommodation chamber 11, by setting the lubricating oil so that the end spherical surface 31 of the connecting rod 3 can move smoothly on the spherical wall surface 10, To quickly adapt to the inclination of the connecting rod 3 caused by vibrations and the like. Moreover, the device of the present invention also includes a sealing ring 8 for sealing the connecting rod accommodating cavity 11 , see FIG. 3 or FIG. 4 . The sealing ring 8 is arranged around the end of the connecting rod 3, and can be installed in the connecting rod accommodating chamber 11 or on the edge of the connecting rod accommodating chamber 11 to prevent external flying dust from entering the chamber, so that the connecting rod will not be damaged by the external environment. The smooth spherical connection formed on the working surface in the accommodation cavity 11.

As shown in FIG. 3 or FIG. 4 , the device of the present invention further includes a positioning mounting plate 9 that is adjustable in position and mounted on the bottom of the support plate 4 , and a connecting rod receiving cavity 11 is formed in the positioning mounting plate 9 . The connecting rod accommodating cavity 11 can be directly formed on the support plate 4, but in this embodiment, it is indirectly arranged on the bottom of the support plate 4 by positioning the mounting plate 9, which is for the convenience of installation. When the connecting rod accommodating cavity 11 is directly formed on the bottom of the support plate 4, it is difficult to vertically align the two. At this time, after the connecting rod 3 is vertically installed by positioning the mounting plate 9, the positioning mounting plate 9 is fixedly installed on the bottom of the support plate 4 by means such as bolts, etc., so that the installation process is simple and the assembly is accurate.

FIG. 3 or FIG. 4 does not show an external controller, which is used to detect the bearing capacity of the cantilever beam sensor 5 . Wherein, the cantilever beam sensor 5 in this embodiment is an elastic metal rod, the surface of the elastic metal rod is provided with a resistance strain gauge, and the resistance strain gauge can be pasted on the elastic metal rod to follow the elastic deformation of the elastic metal rod, and the resistance strain gauge The deformation of the cantilever beam leads to a change in its resistance value, and the generated electrical signal is transmitted to the external controller through the signal cable 7, and then the controller can further convert the bearing capacity of the cantilever beam sensor 5.

The weighing bucket connected to the support plate 4 is likewise not shown in FIG. 3 or FIG. 4 . The supporting plate 4 is fixedly connected to the weighing bucket, and the protruding end is connected with the protective screw 1 . The bottom end of the protection screw 1 can be supported on the installation frame 2 of the mixing station, and the support plate 4 is sleeved on the protection screw 1 in a height-adjustable manner to maintain the structure and force balance of the support plate 4 and the entire weighing device. As mentioned above, when the cantilever beam sensor 5 breaks unforeseen suddenly, causing the support plate 4 to drop suddenly, the bottom end of the protection bolt 1 can be supported on the mixing station installation frame 2, so that the support plate 4 will not continue whereabouts. In addition, the weighing bucket is heavy and needs to be supported at multiple points. In this embodiment, the powder material weighing device includes at least three cantilever beam sensors 5, the at least three cantilever beam sensors 5 are arranged on the same height plane and support the weighing bucket through the connecting rod 3 and the support plate 4 respectively. The connecting rods 3 are triangularly arranged on the same support plane to reliably support the weighing bucket. In the support structure of the weighing bucket, if the structural form of the present invention is adopted, one of the three connecting rods 3 is inclined, and when it is offset by a certain angle, the gravity action point of the connecting rod 3 remains unchanged, that is, the connecting rod The effective support height of 3 remains unchanged, as shown in Figure 8, so that the weighing bucket will not be tilted. However, if the structure shown in Figure 1 is adopted, the inclination of a single connecting rod 3 will change the point of gravity, and the effective support height of the connecting rod 3 will become lower, so that the weighing bucket will easily face the direction of the inclined connecting rod 3 Offset tilt.

The above-mentioned powder weighing device for the mixing station can be applied to the mixing station, so that the structure of the mixing station is stable, the weighing hopper and its powder weighing device are accurate in weighing and reliable in use.

The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (9)

1. the powder weighing device for mixing plant, this device comprises connecting rod (3), gripper shoe (4) and cantilever beam sensor (5), described gripper shoe (4) is connected with the scale hooper of mixing plant and is connected to one end of described cantilever beam sensor (5) by the connecting rod (3) vertically arranged, the other end of this cantilever beam sensor (5) is fixed on mixing plant installing rack (2), it is characterized in that, the two ends of described connecting rod (3) are all formed with end sphere (31), upper surface and the bottom of described gripper shoe (4) of described cantilever beam sensor (5) are formed with the relative connecting rod container cavity (11) in position respectively, be formed in this connecting rod container cavity (11) spherical wall (10) with and the end sphere (31) of described connecting rod (3) between form sphere and be connected, the radius (R) of wherein said spherical wall (10) is identical with the radius of described end sphere (31).

2. the powder weighing device for mixing plant according to claim 1, it is characterized in that, the diameter (D) of the end sphere (31) of described connecting rod (3) is identical with the maximum length (H) of this connecting rod (3).

3. the powder weighing device for mixing plant according to claim 1, is characterized in that, this device also comprises the sealing ring (8) for sealing described connecting rod container cavity (11).

4. the powder weighing device for mixing plant according to claim 1, is characterized in that, at least on described spherical wall (10), is provided with lubricating oil in described connecting rod container cavity (11).

5. the powder weighing device for mixing plant according to claim 1, it is characterized in that, this device is arranged on the location and installation plate (9) of the bottom of described gripper shoe (4) with also comprising position-adjustable, is formed with described connecting rod container cavity (11) in this location and installation plate (9).

6. the powder weighing device for mixing plant according to claim 1, it is characterized in that, this device also comprises the controller of the supporting power for detecting described cantilever beam sensor (5), described cantilever beam sensor (5) is elastic metallic bar, the surface of this elastic metallic bar is provided with resistance strain gage, and described controller is electrically connected with described resistance strain gage.

7. the powder weighing device for mixing plant according to claim 1; it is characterized in that; this device also comprises protection screw rod (1); described gripper shoe (4) is set on described protection screw rod (1), and the bottom of this protection screw rod (1) can support on described mixing plant installing rack (2).

8. the powder weighing device for mixing plant according to claim 1, it is characterized in that, this device comprises at least three described cantilever beam sensors (5), and these at least three cantilever beam sensors (5) to be arranged in sustained height plane and to support described scale hooper respectively by described connecting rod (3) and gripper shoe (4).

9. a mixing plant, is characterized in that, this mixing plant comprises according to the powder weighing device for mixing plant in the claims 1-8 described in any one.