KR20210115369A - Automatic measuring device for measuring degree of finess of coal powder - Google Patents

Abstract

The present invention relates to an automatic measuring device for measuring fineness of pulverized coal, which comprises: a sample collecting unit capturing a part of pulverized coal passing through a transfer pipe; a granularity classifying unit receiving and classifying the pulverized coal collected by the sample collecting unit by granularity; a weight-by-granularity measuring unit receiving the pulverized coal classified by the granularity classifying unit to measure weight of the pulverized coal by granularity; a collection container installed in the lower part of the weight-by-granularity measuring unit to collect the pulverized coal; and a transfer means transferring the granularity classifying unit to the weight-by-granularity measuring unit. The automatic measuring device for measuring fineness of pulverized coal in accordance with the present invention can identify fineness and a ratio by granularity of a sample collected from a pulverized coal transfer pipe in a field in real time so that the pulverized coal transferred to a boiler can be rapidly managed and controlled, thereby enhancing efficiency of the boiler. In addition, a mesh sieve having a multilayered structure is used to identify fineness so that the overall structure is simple and easy to maintain and repair and its performance isn't degraded even under a poor environment from severe vibration.

Description

Automatic measuring device for measuring degree of finess of coal powder

The present invention relates to an automatic fineness measurement device for automatically measuring the fineness degree of coal powder used in thermal power plants, etc. It relates to automatic measuring devices.

Thermal power plants have the disadvantage of generating pollutants because they use fossil energy, but the construction cost of the power plant is relatively low compared to other types of power plants, and in terms of functionality, electricity can be obtained immediately without preheating. have In addition, by integrating various hardware such as construction, electricity, operation, communication, and measurement of the power plant and cutting-edge software to control and manage it, it minimizes pollution prevention through real-time generation efficiency monitoring and control.

The combustion efficiency of coal in thermal power generation is a very important factor that directly affects the overall power generation efficiency. Factors related to the combustion efficiency of coal include the type of coal, dryness, coal-coaling technology, air temperature, flow rate and flow rate of pulverized coal, opening degree of various fans, and fineness of coal.

As a method of measuring the fineness of coal, particle size analysis using a laser, measurement of the amount of electrostatic charge of charged particles, a method using a mechanical mesh sieve, and the like are known.

Particle size analysis by laser is an analysis method in which a laser beam is irradiated to particles using a laser particle size analyzer, and scattered light reflected from the particles is measured with a detector, and the size of particles can be quantitatively measured. However, this laser particle size analysis has disadvantages in that the preparation procedure for the analysis is complicated, and the deviation of the result value is large due to various factors such as contamination or vibration. Accordingly, reliability is a problem in a harsh environment such as the field of a thermal power plant, making it difficult to apply in reality.

In the measurement method using the amount of electrostatic charge, when particles charged with a certain amount of charge pass through the pipe, a detector is inserted into the pipe to measure the electrostatic charge of the particles, and the size of the particles is determined based on the measured value. is a measure However, the measurement using the amount of charge is mainly used to indicate the approximate particle size distribution rather than measuring the exact particle size. It has the disadvantage that it is difficult to apply where Moreover, the accuracy of the particle size analysis itself is low, so the reliability is low, and the cost is high.

On the other hand, the mechanical method using a mesh sieve analyzes the particle size using meshes of various sizes. have However, the conventional measurement using a mesh sieve has a problem in that it is not automated and is almost manually performed from sample collection to particle size analysis.

Even in a poor field exposed to vibration or contamination, an automated measuring device with a structure that can be easily applied and output accurate measurement results is needed.

Domestic Registered Patent Publication No. 10-1205873 (Coal-fired boiler pulverized coal fineness control system for thermal power plant)

The present invention was created to solve the above problems, and it is possible to grasp the fineness and the ratio of each particle size of the sample collected from the pulverized coal transfer pipe in real time in the field, the overall structure is simple, maintenance and repair are easy, and the vibration is severe. An object of the present invention is to provide an automatic measurement device for coal fines that does not degrade in performance even in a harsh environment.

The automatic coal fineness measurement apparatus of the present invention as a means of solving the problem for achieving the above object collects a part of the pulverized coal passing through the pulverized coal transfer tube while being mounted on the pulverized coal transfer tube and takes it out of the pulverized coal transfer tube. wealth; The pulverized coal collected from the sample collection unit is received and separated by particle size. A mesh body assembly having a plurality of mesh sheets having different mesh sizes and spaced apart in the vertical direction, the pulverized coal injected by applying vibration to the mesh body assembly Particle size classification equipped with a vibration generating unit that passes through the mesh sheet and separates by particle size, a support plate installed under the mesh body assembly to support the mesh body assembly, and a weighing machine for measuring the weight of the pulverized coal injected into the mesh body assembly wealth; Measuring the weight of each particle size of the pulverized coal by receiving the pulverized coal classified by the particle size classification unit, a measurement housing having an inlet at the upper portion and providing a measurement space open to the bottom, installed in the measurement space and falling through the inlet A pulverized coal box for accommodating the pulverized coal, and a weight measuring unit for each particle size including a plurality of unit measuring units having a load cell for measuring the weight of the pulverized coal put into the pulverized coal box; a collection passage installed at the lower part of the particle size measuring unit and collecting the pulverized coal that has fallen into the lower part of the measuring housing; and a transfer means for moving the particle size classifying unit toward the particle size measuring unit to move the pulverized coal in the mesh body assembly to the inside of the measuring housing.

In addition, the mesh body assembly; It provides a space part open up and down, and has a discharge duct that opens the space part to the side and can be inserted into the inlet of the measurement housing on one side, the mesh sheet is provided therebetween, and a plurality of receivers corresponding to the unit measurement part one-to-one An ice chamber, installed in each of the discharge ducts, is automatically opened when the discharge duct is inserted into the inlet of the unit measurement unit, and is automatically shut off when exiting from the inlet, and is hinged to the discharge duct and rotates around the hinge A pair of door panels each provided with a pressurizing end caught on the edge of the inlet when the discharge duct enters the inlet, and the door panel are connected and the pressurized end is caught on the edge of the inlet and the door panel opens An automatic opening/closing door having a tension spring that stretches and closes the door panel when the discharge duct is taken out from the inlet is provided to maintain the stacked state of the receiving chamber, and covers the upper part of the mesh body assembly, and from the sample collection unit An upper pressing plate having a pulverized coal passage that can be opened and closed while passing the input pulverized coal, a lower support plate supporting the lower part of the mesh body assembly, a tension bar connecting the upper support plate and the lower support plate and maintaining the gap between the upper support plate and the lower support plate include

In addition, the bottom of the pulverized coal box is provided with a rotating bottom plate that rotates downward by its own weight to open the inner space of the pulverized coal box to the lower side, and inside the measurement housing, the rotary bottom plate of the pulverized coal box after measuring the weight of the pulverized coal A pulverized coal discharge means is installed to open the pulverized coal so that the pulverized coal is discharged from the pulverized coal box to the lower side.

In addition, the measurement housing is provided with an inlet opening and closing means for opening and closing the inlet, and the side of the inlet detects the approach of the discharge duct and transmits the detection fact to the inlet opening and closing means, so that the inlet opening and closing means opens the inlet A proximity sensor is installed.

In addition, the transfer means; a frame that moves the particle size classification unit toward the unit measurement unit so that the discharge duct is fitted into the inlet of each measurement housing, and provides support; A plurality of vertical beams fixed to the frame and having guide slits extending vertically, a pair of horizontal beams supported so as to be able to ascend and descend on the vertical beam and spaced apart from each other in parallel, and a lifting actuator for lifting and lowering the horizontal beam; , A pair of rotation guide plates supported by each of the horizontal beams and capable of reciprocating along the longitudinal direction of the horizontal beams, a pair of rotation guide plates disposed on opposite sides with the particle size classification unit interposed therebetween, and a reciprocating actuator for reciprocating the rotation guide plates; It includes a support rod passing through the support plate and having both ends linked to both sides of the classification unit support plate to serve as a rotation shaft of the particle size classification unit, and a rotation implementing means for rotating the particle size classification unit to rotate the particle size classification unit around the support rod.

In addition, each of the classification part support plate; An arc-shaped guide long hole having the support rod as a rotation center is formed, and a curved gear having the same curvature as the guide long hole is mounted on the side of the guide long hole, and the rotation implementing means includes; A rotating rod axially rotatably installed on the support plate and parallel to the supporting rod and passing through the arc-shaped long hole, a traveling gear fixed to an end of the rotating rod and meshing with the curved gear, and rotating the rotating rod A rotary drive unit is provided.

The automatic coal fineness measurement device of the present invention, which is made as described above, can grasp the fineness level of the sample collected from the pulverized coal transfer pipe and the ratio of each particle size in real time on site, so that it is possible to quickly manage and control the pulverized coal going to the boiler, Accordingly, it is possible to improve the boiler efficiency.

In addition, since a multi-layered mesh body is used to determine the degree of fineness, the overall structure is simple, maintenance and repair are easy, and there is no degradation in performance even in a harsh environment with severe vibration.

1 is a view for explaining the concept of the automatic coal fineness measurement apparatus according to an embodiment of the present invention.
Figure 2 is a block diagram showing the overall configuration of the automatic coal fineness measurement apparatus according to an embodiment of the present invention.
3 is a cutaway perspective view showing a partial structure of the sample collection unit shown in FIG. 2 .
4A is a cross-sectional view taken along line AA of FIG. 3 .
FIG. 4B is a cross-sectional view taken along line BB of FIG. 3 .
FIG. 4C is a cross-sectional view taken along line CC of FIG. 3 .
5A and 5B to 8 are views for explaining the configuration and operation of the sample collection unit shown in FIG. 2 .
9a and 9b are partial cross-sectional views showing the configuration and operation method of the hopper switch of FIG.
10 is an exploded perspective view of the particle size classifier shown in FIG.
11 is a cross-sectional view of the mesh body assembly of FIG.
12 is a right side view of the particle size classification unit shown in FIG. 2 .
13 is a partial perspective view of the conveying means shown in FIG.
14 and 15 are views for explaining the operation of the transfer means of FIG.
16A and 16B are diagrams for explaining the configuration and operating principle of the automatic opening and closing door of FIG. 11 .
17 and 18A and 18B are diagrams for explaining the configuration and operation principle of the weight measuring unit for each particle size shown in FIG. 2 .

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view for explaining the concept of the automatic coal fineness measurement apparatus according to an embodiment of the present invention.

Basically, the automatic coal fineness measurement apparatus 100 according to this embodiment collects a part of the pulverized coal passing through the pulverized coal transfer pipe 11, measures the total weight of the collected sample, and classifies it by particle size. , has a structure that measures the weight for each particle size. By measuring the weight for each particle size, it is possible to determine the degree of pulverization of the pulverized coal that is currently directed to the boiler through the pulverized coal transfer pipe 11 .

The above-described series of processes is performed regularly or irregularly in-situ, and the measured information is transmitted to the central control room 13 in real time and stored and accumulated in the database 15 . In addition, the central control room 13 is filled with various equipment (not shown) for remotely controlling the automatic measuring device 100 . In consideration of the poor environment of the field, the automatic differential measurement device 100 and the central control room 13 are connected by wire. That is, various signals and data information are transmitted through a wired communication network.

Figure 2 is a block diagram showing the overall configuration of the automatic coal fineness measurement apparatus according to an embodiment of the present invention.

As shown, the automatic coal fineness measurement apparatus 100 according to this embodiment includes a sample collection unit 20, a particle size classification unit 30, a particle size weight measurement unit 70, and a transport means 40. be prepared

The sample collection unit 20 serves to collect a part of the pulverized coal passing through the pulverized coal transfer pipe and take it out to the outside of the pulverized coal transfer pipe while being mounted on the pulverized coal transfer pipe 11 . The pulverized coal discharged from the pulverized coal transfer pipe 11 is used as a sample.

3 is a cutaway perspective view showing a partial structure of the sample collection unit 20, and FIG. 4A is a cross-sectional view taken along line A-A of FIG. In addition, Fig. 4b is a cross-sectional view taken along line B-B of Fig. 3, Fig. 4c is a cross-sectional view taken along line C-C of Fig. 3, and Figs. 5a and 5b to 8 are views for explaining the configuration and operation of the sample collection unit shown in Fig. 2 . In addition, FIGS. 9a and 9b are partial cross-sectional views showing the configuration and operation method of the hopper switch of FIG. 8 .

As shown, the sample collection unit 20 includes a support tube 21 , a collection rod 22 , a rod rotation unit 23 , a rod transfer actuator 26 , a rod housing 24 , and a hopper 25 . do.

The support tube 21 is a straight member extending in the longitudinal direction across the inside of the pulverized coal delivery pipe 11 and having both ends supported on the inner circumferential surface of the pulverized coal delivery pipe. The support tube 21 has a predetermined cross-sectional shape and provides a support space 21b, as shown in FIG. 4A. The support space 21b is a space opened in the upstream direction of the pulverized coal through the inlet part 21a. The support tube 21 may be made of stainless steel. In addition, one end of the support tube 21 is opened to the outside of the pulverized coal transfer pipe 11 to receive the collection rod 22 .

The collecting rod 22 is a round bar-shaped member mounted to be axially rotated and slidably moved in the longitudinal direction in the support space 21b, and has a collecting space 22e and first and second gear portions 22c and 22d. The outer circumferential surface of the collecting rod 22 is interviewed with the inner circumferential surface of the support tube 21 .

The collection space 22e is a space open to one side of the collection rod 22, as shown in FIG. 4b, and accommodates a part of the pulverized coal facing from the upstream, as shown in FIG. 5b. The volume of the collection space 22e may be changed as needed. In addition, the first gear part 22c and the second gear part 22d are formed by machining the outer circumferential surface of the collecting rod 22 , and selectively mesh with a driving gear 23e to be described later and receive shaft rotational power.

Reference numeral 22b denotes an actuator connection part. The actuator connection portion 22b is a groove in which the carrier 26a of the rod transfer actuator 26 is filled. The carrier 26a supports the actuator connection part 22b so as to be axially rotatable. Even if the collecting rod 22 is held by the carrier 26a, the shaft rotation is not hindered.

The rod transfer actuator 26 is fixed to the side of the pulverized coal transfer pipe 11 as an electric linear motion output unit. An appropriate bracket (not shown) may be applied for fixing the rod transfer actuator 26 . The rod transfer actuator 26 receives an electric signal from the controller 90 to linearly reciprocate the carrier 26a. The movement path of the carrier 26a is parallel to the support tube 21 . The controller 90 in this embodiment is connected to the central control room 13 and outputs a control signal for operating the automatic measuring device 100 according to the situation.

In addition, the rod housing 24 is a pipe-shaped member fixed to the outside of the pulverized coal delivery pipe 11, and forms a straight line with the support tube 21 and accommodates the collecting rod 22 drawn out of the pulverized coal delivery pipe. The collecting rod 22 is capable of axial rotation and longitudinal sliding motion even in a state accommodated in the support tube 21 .

In addition, the hopper 25 is positioned at the lower portion of the load housing 24 . The hopper 25 serves to send the pulverized coal that has fallen from the collection space 22e of the collection rod 22 located in the rod housing down to the pulverized coal passage (32a in FIG. 11) of the particle size classification unit 30 to be described later. , a plurality of vibration generators 25a and a hopper switch 27 are provided.

The vibration generator 25a transmits vibration to the hopper 25 to help the pulverized coal to move downward. There is no fear that pulverized coal remains in the hopper 25 by the action of the vibration generator 25a.

The hopper switch 27 opens or blocks the lower end of the hopper 25 to determine the supply of pulverized coal. 9A and 9B, the hopper switch 27 is a shutter case 27a fixed to the lower end of the hopper 25, a shutter 27b that is slidable while supported by the shutter case 27a, and the shutter It is composed of an opening/closing motor 27c that moves the 27b. The shutter 27b contacts the friction wheel 27d rotated by the opening/closing motor 27c, and horizontally reciprocates by rotation of the friction wheel 27d to open and close the shutter case 27a. The opening/closing motor 27c is also controlled by the controller 90 .

The rod rotating part 23 is composed of a linear actuator 23a, a motor 23d, and a driving gear 23e, as shown in FIG. 3 . The linear actuator 23a elevates the motor 23d by outputting a vertical linear motion force while being fixed to the outside of the pulverized coal transport pipe 11 . The motor 23d moves forward and backward with respect to the collecting rod 22 by the action of the linear actuator 23a.

The driving gear 23e transmits the rotational force of the motor 23d to the collecting rod 22, and selectively meshes with the first gear part 22c and the second gear part 22d through the forward and backward movement. That is, in a state in which the collecting rod 22 is completely inserted into the support tube 21 , it meshes with the first gear portion 22c , and in a state in which the collecting rod 22 comes out of the rod housing 24 , the second It meshes with the gear part 22d.

The operation of the sample collection unit 20 having the above configuration is performed as follows.

Figure 5a is a view showing a state of collecting the pulverized coal (Z) with the collection rod 22, Figure 5b is a cross-sectional view taken along the line D-D of Figure 5a. In addition, FIG. 6a is a state in which the pulverized coal is collected and the pulverized coal is hidden inside the support tube 21, and FIG. 6b is a cross-sectional view taken along line E-E of FIG. 6a. 7 is a state in which the collection rod 22 is taken out of the pulverized coal transport pipe 11 , and FIG. 8 is a view showing a state in which the collected pulverized coal is poured into the hopper 25 .

First, as shown in FIG. 5A , the collection rod 22 is completely inserted into the pulverized coal transfer pipe 11 . At this time, the collection space 22e of the collection rod 22 faces the upstream side of the pulverized coal, ie, the lower part in the drawing. Of course, a part of the pulverized coal (Z) moving toward the boiler is collected in the collection space (22e). In addition, at this time, the driving gear 23e is spaced apart from the first gear portion 22c.

If the pulverized coal collection is completed in the above state, as shown in FIG. 6a , the motor 23d is raised to mesh the driving gear 23e with the first gear part 22c, and then the collection rod 22 is rotated 180 degrees. rotate By this rotation, the collection space 22e is hidden in the support space 21b of the support tube 21 .

Then, the driving gear 23e is temporarily lowered and then the collection rod 22 is moved in the arrow f direction, so that the collection rod 22 is accommodated in the rod housing 24 as shown in FIG. 7 . Also at this time, the collection space 22e faces upward.

If the collecting rod 22 is properly positioned on the rod housing 24, the driving gear 23e is raised again to mesh with the second gear part 22d, and then the collecting rod 22 is rotated 180 degrees. According to the rotation of the collection rod 22, the collection space 22e is directed vertically downward, and the collected pulverized coal Z is put into the hopper 25 by the action of gravity. The pulverized coal passes through the hopper 25 and moves to the particle size classification unit 30 .

The particle size classification unit 30 separates the pulverized coal supplied from the sample collection unit 20 by particle size and then transfers it to the particle size weight measurement unit 70 and is supported by the conveying means 40 . The conveying means 40, under the control of the controller (90 in FIG. 2), moves the particle size classification unit 30 in the direction of the arrow g, and then rotates it 90 degrees toward the particle size weight measurement unit 70 in the vertical direction. As the lowering, a description thereof will be described later.

10 is an exploded perspective view of the particle size classification unit 30 shown in FIG. 2 , and FIG. 11 is a cross-sectional view of the mesh body assembly 30A of FIG. 10 . 12 is a right side view of the particle size classification unit.

As shown, the particle size classification unit 30 is largely composed of a mesh body assembly 30A and a vibration support unit 30B. The mesh body assembly 30A serves to classify the pulverized coal Z input from the hopper 25 by particle size. In addition, the vibration support unit 30B shakes the mesh assembly 30A while supporting the mesh assembly 30A so that the pulverized coal passes through the mesh sheet 31b quickly, and further measures the total weight of the pulverized coal input. . In particular, the vibration support unit 30B serves to connect the mesh assembly 30A and the transfer means 40 .

As shown, the mesh assembly 30A includes a plurality of receiving chambers 31a having mesh sheets 31b having different mesh sizes. Each receiving chamber 31a takes the form of a cylinder of a certain diameter opened up and down, provides a space portion 31f, and has a discharge duct 31c on the side thereof. The discharge duct 31c is a passage for guiding the pulverized coal of a particle size that remains in the space portion 31f and filtered on the mesh sheet 31b to the weight measurement unit 70 by particle size.

In addition, the mesh sheet 31b is fixed to the bottom of the receiving chamber 31a and filters the pulverized coal. The mesh size of the mesh sheet 31b increases as it goes down. For example, if the uppermost mesh sheet is 200 mesh, the middle mesh sheet is 400 mesh, and the lower mesh sheet is 600 mesh. This mesh sheet 31b partitions the space portion 31f of the receiving chamber 31a adjacent up and down.

In addition, a plurality of discharge ducts (31c) are arranged in a straight line in the vertical direction, as shown in Figure 16b, is extended so as to completely pass through the inlet (71e). An automatic opening and closing door 36 is installed at the end of the discharge duct 31c.

The automatic opening/closing door 36 has a configuration that is automatically opened when the discharge duct 31c is inserted into the inlet 71e of the unit measurement unit, and is automatically blocked when it comes out of the inlet 71e.

The automatic opening/closing door 36 includes a pair of door panels 36a and a tension spring (36d in FIG. 16A). The door panel 36a is rotatably supported by the discharge duct 31c through the hinge part 36b and is maintained in a closed state by the tension spring 36d. In particular, the pressing end portions 36e are integrally formed on the outer ends of the both side door panels 36a. As shown in Fig. 16a, the pressing end portion 36e is a portion caught by the edge portion of the inlet 71e when the discharge duct 31c is inserted into the inlet 71e.

16A and 16B are diagrams for explaining the configuration and operating principle of the automatic opening/closing door 36 of FIG. 11 .

Referring to FIG. 16 , it can be seen that both door panels 36a are kept closed by the tension springs 36d. Both ends of the tension spring 36d are connected to both side door panels 36a through the spring hooks 36c. When the door panel 36a is closed, no load is applied to the tension spring 36d. In other words, in a state where no external force is applied, the spacing between the spring hangers 36c on both sides does not change.

When the automatic opening/closing door 36 having the above configuration is lowered toward the inlet 71e, the pressing end 36e is caught on the edge of the inlet 71e. When the discharge duct 31c is further lowered in this state, the door panels 36a on both sides rotate around the hinge part 36b and open, and the pulverized coal inside the receiving chamber 31a is poured down. At this time, of course, the tension spring 36d is stretched.

When the receiving chamber 31a is raised after delivery of the pulverized coal is completed, the door panel 36a is retracted by the action of the tension spring 36d, and the state of FIG. 16A is obtained.

In order to maintain the stacked state of the receiving chamber 31a, an upper pressing plate 32, a lower supporting plate 34, a plurality of tension rods 35a, and a pressing nut 35c are applied. The upper pressing plate 32 is a metal plate having a predetermined thickness and covers the upper portion of the uppermost receiving chamber 31a. In addition, the lower support plate 34 is a metal plate having the same size as the upper pressing plate 32 and supports the lowermost receiving chamber 31a.

The tension rod 35a is a metal rod having a male threaded portion 35b formed on its outer circumferential surface, and the upper end is coupled with the pressing nut 35c while passing the upper pressing plate 32 upward, and the lower end is the lower support plate 34 . After passing downward, it is coupled to the female screw hole (38a). The female screw hole 38a is a screw hole formed in the upper surface of the weighing machine 38 .

While the lower end of the tension bar 35a is coupled to the female screw hole 38a, as the pressure nut 35c is fastened to the male screw portion 35b on the upper pressure plate 32, the upper pressure plate 32 is pulled downward. and the receiving chambers 31a are in close contact with each other. In addition, the mesh assembly 30A and the vibration support part 30B are coupled by the tension rod 35a.

A pulverized coal passage 32a is provided in the central portion of the upper pressing plate 32 . The pulverized coal passage 32a is a hole through which the pulverized coal discharged from the hopper 25 passes downward, and is opened and closed by the introduction door 33 . The introduction door 33 includes a motor 33c controlled by the controller 90, an opening/closing gear 33d fixed to the drive shaft of the motor 33c, and a blocking plate 33a that slides while meshing with the opening/closing gear 33d. ) is composed of A gear portion 33b that meshes with the opening/closing gear 33d is formed on the bottom surface of the blocking plate 33a. The blocking plate 33a reciprocates in the horizontal direction by the operation of the motor 33c to open and close the pulverized coal passage 32a. A separate guider (not shown) for guiding the sliding motion of the blocking plate 33a may be applied.

On the other hand, the vibration support unit 30B, a base plate 37 in the form of a square plate having a certain thickness, a weigher 38 installed on the base plate 37, and a vibration disposed on the weigher 38 A generator (39) is provided.

A support rod 37k and a rotation rod 37b are fitted to the base plate 37 in parallel. The support rod 37k and the rotation rod 37b are round rods extending parallel to each other, and are axially rotatable while being inserted into the base plate 37 . In addition, as shown in FIG. 12 , an intermediate gear installation groove 37a is provided on one side of the base plate 37 . An intermediate gear 37c to be described later is accommodated in the intermediate gear installation groove 37a. The support rod 37k and the rotation rod 37b are part of the transfer means 40 to be described later.

The weight meter 38 measures the load coming down from the top while being mounted on the top of the base plate 37 . In other words, the total weight of the pulverized coal input to the mesh assembly 30A is measured. The measured weight data is transmitted to the central control room described above and stored in the database. A load cell may be applied as the weigher 38 .

The vibration generating unit 39 includes a vibrator 39a and a controller 39c mounted on a buffer pad 37b. The controller 39c receives a signal from the controller 90 and serves to drive the vibrator 39a. In some cases, the controller 90 may directly drive the vibrator 39a.

The vibrator 39a vibrates the entire mesh assembly 30A by outputting vibration energy in a state in close contact with the bottom surface of the lower support plate 34 . The reason for vibrating the mesh body assembly 30A is to shake the pulverized coal injected into each receiving chamber 31a to pass through the mesh sheet 31b.

The buffer pad 39b suppresses the vibration energy of the vibrator 39a from flowing downward as much as possible. That is, to minimize the transmission of vibration to the weigher 38 or the base plate (37).

The particle size classifying unit 30 having the above configuration is installed on the frame 50 to be movable by the transfer means 40 . The transfer means 40 moves the particle size classification unit 30 to the particle size weight measurement unit 70 , so that each discharge duct 31c is inserted into the inlet 71e. That is, after moving the vertically erected particle size classification unit 30 in the direction of the arrow g in FIG. 2 , it is rotated 90 degrees forward and then vertically descended.

13 is a perspective view illustrating a part of the transfer means 40, and FIGS. 14 and 15 are views for explaining the operation of the transfer means.

As shown, the transport means 40 includes a plurality of vertical beams 51 fixed to the frame 50 , a pair of horizontal beams 52 horizontally supported by the vertical beams 51 , and a lifting actuator 53 . ), a rotation guide plate 61, a reciprocating actuator 63, a support rod 37k, and a means for implementing rotation.

The vertical beam 51 is fixed to the frame 50 and has a guide slit 51a as a vertically extending structure. The guide slit 51a guides the lifting motion of the horizontal beam 52 .

The horizontal beam 52 is capable of elevating with both ends supported by the vertical beam 51, and the two are arranged side by side. A lifting actuator 53 is installed at a lower portion of each horizontal beam 52 . The lifting actuator 53 serves to adjust the height of the horizontal beam 52 . The lifting actuator 53 and the reciprocating actuator 63 may be electric or hydraulic.

In addition, the rotation guide plate 61 is mounted on both sides of the horizontal beam 52, respectively. The rotation guide plate 61 is a metal plate having a certain thickness, that is, a partial disk in the form of a quarter cut of the original plate. The lower end of the rotation guide plate 61 is provided with a sliding portion (61b) and a lower link portion (61c).

The sliding part 61b is provided with a supporting force from the horizontal beam 52 while being fitted to the horizontal beam 52 so as to move in a straight line. The rotation guide plate 61 can be maintained in a vertically erected state by the sliding part 61b. The lower link portion 61c is a portion protruding downward from the sliding portion 61b and is connected to the reciprocating actuator 63 . The rotation guide plate 61 is linearly movable along the longitudinal direction of the horizontal beam 52 by the reciprocating actuator 63 .

In addition, a guide long hole (61a) is formed in the rotation guide plate (61). The guide long hole 61a is an arc-shaped long hole centered on the support rod 37k. An angle between the imaginary straight lines connecting both ends of the guide long hole 61a and the support rod 37k forms a right angle. In addition, the curved gear 62 is fixed to the side of the guide long hole 61a. The curved gear 62 is a gear having the same curvature as the guide long hole 61a, and is parallel to the guide long hole 61a.

The two rotation guide plates 61 of this configuration are positioned on opposite sides with the particle size classification unit 30 interposed therebetween, and simultaneously translate in the same direction.

On the other hand, both ends of the support rod (37k) passing through one side of the base plate (37) is fixed to the rotation guide plate (61). The support rod 37k serves as a rotation center when the base plate 37 rotates. That is, the particle size classification unit 30 serves as a rotation axis when rotating in the direction of the arrow h in FIG. 14 .

In addition, both ends of the rotating rod (37b) is provided with a traveling gear (37d) at the end in a state passing through the guide long hole (61a). The traveling gear 37d is fixed to the rotating rod 37b and meshes with the curved gear 62 .

The above-described rotation realization means rotates the particle size classification unit 30 in the direction of the arrow h of FIG. 14 or the opposite direction, and includes a rotating rod 37b, a traveling gear 37d, and a rotation driving unit. The rotation driving unit includes an intermediate gear (37c in FIG. 12 ) and a tilting motor 37e.

As shown in FIG. 12, the rotating rod 37b has an intermediate gear 37c in the central part while passing through the base plate 37. The intermediate gear 37c is fixed to the rotating rod 37b and exposed downward through the intermediate gear installation groove 37a. The tilting motor 37e has a rod drive gear 37f on the drive shaft. The rod driving gear 37f meshes with the intermediate gear 37c.

The rotation torque output from the tilting motor 37e is transmitted to the rotation rod 37b via the rod drive gear 37f and the intermediate gear 37c to rotate the rotation rod 37b shaft. It goes without saying that the traveling gear 37d also rotates according to the shaft rotation of the rotating rod 37b. Since the traveling gear 37d is in a meshing state with the curved gear 62, the particle size classification unit 30 may rotate in an angle range of 90 degrees by the tilting motor 37e.

The operation of the transfer means 40 having the above configuration is made as follows.

If the particle size classification of the pulverized coal is completed in the particle size classification unit 30, as shown in FIG. 14, the reciprocating actuator 63 moves the particle size classification unit 30 in a straight line in the direction of the arrow g. If the advance of the particle size classification unit 30 is completed by the reciprocating actuator 63, the tilting motor 37e is operated to rotate the particle size classification unit 30 forward by 90 degrees. Each discharge duct 31c is positioned vertically above the inlet 71e by rotation of the particle size classification unit 30 .

Then, the lifting actuator 53 is operated to vertically lower the particle size classification unit 30 . As the particle size classification unit 30 descends, each discharge duct 31c is inserted into the inlet 71e, and the pulverized coal classified by particle size is moved to the unit measurement unit 71 of the weight measurement unit 70 by particle size. When the transfer of the pulverized coal is completed, the particle size classification unit 30 is raised and then vertically erected and then returned to its original position rearward.

17 and 18A and 18B are diagrams for explaining the configuration and operating principle of the weight measuring unit 70 for each particle size shown in FIG. 2 .

The weight measurement unit 70 by particle size receives the pulverized coal in a state classified by particle size from the particle size classification unit 30 and measures the weight of the pulverized coal by particle size, and has a plurality of unit measurement units 71 . The unit measurement unit 71 corresponds to the receiving chamber 31a one-to-one. Since there are four receiving chambers 31a in this embodiment, there are also four unit measuring units 71.

The plurality of unit measurement units 71 are supported by the container 80 in a state in which they are connected to each other. The container 80 is a container that receives the pulverized coal discharged from the unit measuring unit 71 . When the pulverized coal is collected in the container 80 to some extent, the container 80 is separated from the weight measuring unit 70 for each particle size to properly process the pulverized coal.

A plurality of positioning grooves (81a) are provided at the inner upper end of the container (80). The positioning groove 81a is a groove into which the fitting protrusion 71c of the lower end of each measurement housing 71a is fitted. By inserting the fitting protrusion (71c) into the positioning groove (81a), the mounting of the weight measuring unit (70) for each particle size to the container (80) is automatically made. Reference numeral 81b denotes a carrying handle for carrying the container 80 .

Meanwhile, the plurality of unit measurement units 71 are electrically connected to the neighboring unit measurement units 71 while in close contact with each other. To this end, an electrical connection part 71b is installed on the side of the measurement housing 71a. The electrical connection part 71b meets the electrical connection part of the neighboring measurement housing 71a and is electrically connected. Therefore, even if power is supplied to only one of the four unit measuring units 71 , power may be transmitted to all of the unit measuring units 71 .

The unit measuring unit 71 includes a measuring housing 71a, a pulverized coal box 75, a load cell 74, a traction actuator 76 as a pulverized coal discharge means, a return spring 78, and an inlet opening and closing means.

The measurement housing (71a) takes the shape of an approximately L-shaped bent and provides a measurement space (71f). The measurement space portion 71f is an inner space of the measurement housing 71a and accommodates some of the above-described components. The measurement housing (71a) is opened to the lower portion and has an inlet (71e) at the upper portion. The inlet 71e is a passage through which the pulverized coal is introduced.

The pulverized coal box 75 is positioned above the load cell 74 as a case for accommodating the pulverized coal injected into the inlet 71e. The weight of the pulverized coal that has entered the pulverized coal box 75 is sensed by the load cell 74 .

A rotary bottom plate (75a) is installed on the bottom of the pulverized coal box (75). The rotary bottom plate 75a is a square plate with one end connected through a connection pin 75b, and blocks the lower portion of the pulverized coal box 75 in a state where the pulverized coal box 75 is located in the load cell 74, as shown in FIG. 18a. , in the state of moving in the direction of the arrow k, it rotates downward under the action of gravity. When the rotary bottom plate (75a) rotates downward, the pulverized coal inside the pulverized coal box (75) escapes to the lower side, of course.

In addition, a support arm (75d) is provided on one side of the pulverized coal box (75). The support arm 75d is a member bent at a right angle, and is a part pulled in the arrow k direction by the pull hook 76b. The return spring 78 is installed on the opposite side of the support arm 75d and pulls the pulverized coal box 75 in the opposite direction to the arrow k direction.

When the reciprocating block 76a moves in the direction of the arrow m, the pulverized coal box 75 pulled toward the traction actuator 76 is pulled by the return spring 78 to return to the upper part of the load cell 74 .

The load cell 74 measures the weight of the pulverized coal input into the pulverized coal box 75 , and transmits weight information to the central control room 13 . The central control room stores the weight of the pulverized coal separated by particle size in the database 15 .

The traction actuator 76 has a reciprocating block 76a as an electric linear motion output means. A traction hook 76b is fixed to the reciprocating block 76a. The pull hook 76b extends horizontally and always supports and supports the support arm 75d. The support arm 75d is supported on the pull hook 76b to maintain the same height.

In order to empty the pulverized coal box 75 using the traction actuator 76, the reciprocating block 76a is moved backward in the state shown in FIG. 18a. As the reciprocating block (76a) moves backward, the support arm (75d) hung on the traction hook (76b) also moves together so that the pulverized coal box (75) moves in the direction of the arrow k, and the rotary bottom plate (75a) is opened accordingly. do. The pulverized coal box 75 does not deviate from the upper surface of the load cell 74 .

When the discharge of the pulverized coal is completed, the traction hook 76b is moved in the direction of the arrow m, so that the pulverized coal box 75 receives the elastic force of the return spring 78 and returns to the upper part of the load cell 74 .

On the other hand, an inlet opening and closing means for opening and closing the inlet 71e and an approach detection sensor 71d are installed on the upper surface of the measurement housing 71a. The approach detection sensor 71d detects the approach of the exhaust duct 31c and outputs a detection signal. The signal output from the approach detection sensor 71d is transmitted to the communication module 77 to operate the linear actuator 72 .

The inlet opening/closing means includes a linear actuator 72 that operates by receiving a signal from the approach detection sensor 71d, and a door plate 73 connected to the linear actuator 72 through a connecting rod 72a. The door plate 73 takes the shape of a square plate and opens and closes the inlet 71e. As a result, when the discharge duct 31c approaches the measurement housing 71a, the door plate 73 moves and the inlet 71e is opened.

The approach detection sensor 71d outputs a signal even when the discharge duct 31c moves away from the measurement housing 71a, causing the linear actuator 72 to block the inlet 71e.

As mentioned above, although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill within the scope of the technical spirit of the present invention.

11: Pulverized Coal Conveyor 13: Central Control Room 15: Database
20: sample collection unit 21: support tube 21a: inlet
21b: support space 22: collection rod 22b: actuator connection part
22c: first gear unit 22d: second gear unit 22e: collection space
23: rod rotating part 23a: linear actuator 23d: motor
23e: drive gear 24: rod housing 25: hopper
25a: vibration generator 26: rod transfer actuator 26a: carrier
27: Hopper switch 27a: Shutter case 27b: Shutter
27c: opening/closing motor 27d: friction wheel 30: particle size classification unit
30A: mesh assembly 30B: vibration support 31a: receiving chamber
31b: mesh sheet 31c: exhaust duct 31f: space part
32: upper press plate 32a: pulverized coal passage 33: introduction door
33a: blocking plate 33b: gear 33c: motor
33d: switching gear 34: lower support plate 35a: tensile bar
35b: male thread 35c: press nut 36: automatic opening and closing door
36a: door panel 36b: hinge part 36c: spring hanger
36d: tension spring 36e: pressure end 37: base plate
37a: Intermediate gear installation groove 37b: Rotating rod 37c: Intermediate gear
37d: driving gear 37e: tilting motor 37f: rod driving gear
37k: support rod 38: weigher 38a: female thread
39: vibration generator 39a: vibrator 39b: buffer pad
39c: controller 40: transport means 50: frame
51: vertical beam 51a: guide slit 52: horizontal beam
53: elevating actuator 61: rotation guide plate 61a: guide long hole
61b: sliding part 61c: lower link part 62: curved gear
63: reciprocating actuator 70: weight measurement unit by particle size 71: unit measurement unit
71a: measuring housing 71b: electrical connection 71c: fitting
71d: Approach sensor 71e: Inlet 71f: Measurement space
72: linear actuator 72a: connecting rod 73: door plate
74: load cell 75: pulverized coal box 75a: rotating bottom plate
75b: connection pin 75d: support arm 76: traction actuator
76a: reciprocating block 76b: towing hook 77: communication module
78: return spring 80: container 81a: home position
81b: carrying handle 90: controller 100: automatic measuring device

Claims (6)

a sample collecting unit that collects a part of the pulverized coal that passes through the pulverized coal transfer tube while being mounted on the pulverized coal transfer tube and takes it out to the outside of the pulverized coal transfer tube;
The pulverized coal collected from the sample collection unit is received and separated by particle size. A mesh body assembly having a plurality of mesh sheets having different mesh sizes and spaced apart in the vertical direction, the pulverized coal injected by applying vibration to the mesh body assembly Particle size classification equipped with a vibration generating unit that passes through the mesh sheet and separates by particle size, a support plate installed under the mesh body assembly to support the mesh body assembly, and a weighing machine for measuring the weight of the pulverized coal injected into the mesh body assembly wealth;
Measuring the weight of the pulverized coal by particle size by taking over the pulverized coal classified by the particle size classification unit, a measuring housing having an inlet at the upper portion and providing a measurement space open to the bottom, installed in the measurement space and falling through the inlet A pulverized coal box for accommodating the pulverized coal, and a weight measuring unit for each particle size including a plurality of unit measuring units having a load cell for measuring the weight of the pulverized coal put into the pulverized coal box;
a collection passage installed at the lower part of the particle size measuring unit and collecting the pulverized coal that has fallen into the lower part of the measuring housing;
and a transfer means for moving the particle size classifying unit toward the particle size measuring unit to move the pulverized coal in the mesh body assembly to the inside of the measuring housing. According to claim 1,
The mesh body assembly;
It provides a space part open up and down, has a discharge duct that opens the space part to the side and can be inserted into the inlet of the measurement housing on one side, the mesh sheet is provided therebetween, and a plurality of receivers corresponding to the unit measurement part one-to-one ice chamber,
It is installed in each of the discharge ducts, is automatically opened when the discharge duct is inserted into the inlet of the unit measurement unit, and is automatically shut off when exiting from the inlet, is hinged to the discharge duct and rotatable around the hinge, and the discharge duct A pair of door panels each having a pressurized end caught on the rim of the inlet when entering the inlet, and connecting the door panels, the pressurizing end is caught on the rim of the inlet and stretches when the door panel is opened and discharged from the inlet An automatic opening and closing door having a tension spring that closes the door panel when the duct is taken out is provided;
As maintaining the stacked state of the receiving chamber,
An upper pressing plate that covers the upper part of the mesh body assembly, passes the pulverized coal input from the sample collection unit, and has a pulverized coal passage that can be opened and closed, a lower support plate supporting the lower part of the mesh body assembly, and the upper support plate and the lower support plate are connected And automatic coal fineness measurement device including a tension bar that maintains the gap between the upper and lower support plates. 3. The method of claim 2,
At the bottom of the pulverized coal box, a rotating bottom plate is provided that rotates downward by its own weight to open the inner space of the pulverized coal box to the lower side,
Inside the measurement housing,
After measuring the weight of the pulverized coal, the pulverized coal discharging means is installed to open the rotary bottom plate of the pulverized coal box so that the pulverized coal is discharged from the pulverized coal box to the lower side. 3. The method of claim 2,
The measuring housing is provided with an inlet opening and closing means for opening and closing the inlet,
Coal fines automatic measurement device is installed on the side of the inlet, the approach detection sensor for detecting the approach of the discharge duct and transmitting the detection fact to the inlet opening and closing means, so that the inlet opening and closing means opens the inlet. 3. The method of claim 2,
The transport means;
By moving the particle size classification unit toward the unit measurement unit, the discharge duct is fitted into the inlet of each measurement housing,
a frame that provides support;
a plurality of vertical beams fixed to the frame and having guide slits extending vertically;
A pair of horizontal beams supported so as to be liftable on the vertical beam and spaced apart in parallel to each other;
a lifting actuator for lifting and lowering the horizontal beam;
A pair of rotation guide plates supported by each of the horizontal beams and capable of reciprocating along the longitudinal direction of the horizontal beams, disposed on opposite sides with the particle size classifying unit interposed therebetween;
a reciprocating actuator for reciprocating the rotation guide plate;
a support rod passing through the support plate and having both ends linked to both sides of the classification part support plate to serve as a rotation shaft of the particle size classification part;
Coal fineness automatic measuring device comprising a rotation realizing means for rotating the particle size classification unit to rotate the particle size classification unit around the support rod. 6. The method of claim 5,
In each of the classification part support plate;
An arc-shaped guide long hole with the support rod as a rotation center is formed,
A curved gear having the same curvature as the guide long hole is mounted on the side of the guide long hole,
The rotation implementing means;
A rotating rod that is axially rotatably installed on the support plate and is parallel to the support rod and passes through the arc-shaped long hole;
a traveling gear fixed to the end of the rotating rod and meshing with the curved gear;
Coal fineness automatic measurement device having a rotary driving unit for rotating the axis of the rotary rod.

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