CN107008910A - A kind of lead-power machine - Google Patents

Abstract

The invention discloses a lead powder machine, which includes a main machine and a discharge pipe. A screening device is installed on the discharge pipe. The screening device includes a volute with an air inlet and an air outlet. The driven turbine is ring-shaped, with an air inlet channel connected to the air outlet in the center, blades arranged around the air inlet channel on the periphery, and gaps communicating with the air inlet channel between adjacent blades. The lead powder machine of the present invention is equipped with a screening device on the discharge pipe of the main machine, and the large-particle lead powder is screened out and re-enters the main machine for crushing, and the small-particle lead powder that meets the specifications is collected, thereby producing a finer particle size and Distribute lead powder with a smaller span, thereby improving the consistency of the plate curing effect and the consistency of the battery, and extending the service life of the entire battery.

Description

A lead powder machine

technical field

The invention relates to the technical field of lead storage battery production equipment, in particular to a lead powder machine.

Background technique

Lead powder is one of the most important raw materials for the production of lead-acid batteries. The performance parameters of lead powder generally include oxidation degree, apparent density, acid absorption value, water absorption value, particle size and its distribution. Among them, the particle size and distribution of lead powder have a great influence on the performance of the plate and battery. The finer the lead powder, the greater the porosity of the unformed plate, and it is easy to convert into the active substance PbO during polarization. _2. The initial capacity is large, and the finished battery has good charge acceptance.

At present, most of the industry adopts the drum type lead powder machine (also known as Shimadzu type lead powder machine) system for powder making. Drum type lead powder machine (also known as Shimadzu type lead powder machine) is the most commonly used machine for producing lead powder from lead blocks. The drum-type lead powder machine generally includes an outer casing, a rotating drum inside the casing, an air supply device, a cooling spray device, a lead powder collection device, etc., and the drum is used to make the lead particles tumble, rub and collide, and supply air. The device is used to provide the air required for the oxidation of lead powder and to separate the lead powder and lead particles. The cooling spray device is used to cool down the drum, and the lead powder collection device is used to collect the lead powder produced by the drum. Generally, the drum is installed on the machine base with the hollow shafts at both ends through bearings, and the hollow shafts at both ends are respectively used as the inlet of wind and lead particles and the outlet of wind and lead powder.

In general, the powder process of lead powder mechanism is as follows:

Send the lead lumps from the lead particle storage bin to the lead powder machine drum according to the load, and at the same time, input a certain amount of fresh air into the lead powder machine through the fan. The lead powder machine drum is driven by the transmission mechanism and rotates at a certain speed. The lead blocks in the lead powder machine are constantly rubbed, impacted, crystal deformation, displacement, and oxidized. The oxidized part of the lead block surface gradually falls off from the block. Continued And further pulverized, pulverized and formed the fine granular lead powder that covers a layer of PbO. These fine particles are raised by the rotation of the drum and the scraper on the inner wall of the drum, and are taken out of the drum of the lead powder machine by the air flow, enter the outlet elbow, and then enter the powder collector, and the lead powder in the air flow is removed by the function of the bag in the powder collector. It is collected and then transported to the powder bin for storage. At the powder outlet elbow, the oversized particles will settle down and be pushed back to the drum of the lead powder machine through the reverse screw device for further grinding.

The particle size analysis of the lead powder produced by the above production process shows that the particle size distribution of the lead powder is too wide, ranging from 0 μm to 120 μm. The particle size distribution of the lead powder is too wide and the uniformity is poor, resulting in a large difference in the curing effect of the plate, which ultimately affects the service life of the battery.

Contents of the invention

The present invention aims at the problem that the particle size distribution span of the lead powder prepared by the existing lead powder machine is too wide, and provides a lead powder machine. Fine, better uniformity.

A lead powder machine, comprising a main engine and a discharge pipe, a screening device is installed on the discharge pipe, the screening device includes a volute with an air inlet and an air outlet, and a turbine driven by a motor is arranged in the volute, The turbine is ring-shaped, with an air inlet channel connected to the air outlet in the center, blades arranged around the air inlet channel on the periphery, and gaps connecting the air inlet channel between adjacent blades.

The volute is in the shape of a tube, the bottom is tapered in radial direction, and the bottom end is provided with a material return port, the air inlet is provided on the side of the volute, and the air outlet is provided on the top end surface of the volute.

The top end surface of the turbine matches the inner wall of the volute.

The turbine has a rotating shaft extending out of the volute through the air outlet, and a protective cover surrounding the rotating shaft is provided outside the volute, and the protective cover is connected to the discharge pipe.

The end of the air inlet passage near the air outlet is provided with a cross connected to the rotating shaft.

A return auger is installed at the discharge port of the main engine, and the feed end of the discharge pipe and the bottom of the volute are both connected to the return auger.

The bottom of the volute is connected to the return auger through the feeding valve.

Both ends of the turbine are provided with end covers for fixing the blades, and the center of the end covers has a through hole.

The lead powder machine of the present invention is equipped with a screening device on the discharge pipe of the main engine. The screening device includes a volute, and the turbine in the volute rotates under the drive of the electrode. , the rotation of the turbine makes the lead powder particles form a centrifugal force, and the large particles are thrown out from the gap between the turbine blades with a large centrifugal force, and finally re-enter the main engine for crushing. Enter the cloth bag for subsequent collection of lead powder, so as to produce lead powder with finer particle size and smaller distribution span, so as to improve the consistency of plate curing effect and battery consistency, and prolong the service life of the entire battery.

Description of drawings

Fig. 1 is the structural representation of lead powder machine of the present invention.

Fig. 2 is the structural representation of the screening device of the lead powder machine of the present invention.

Fig. 3 is a structural schematic diagram of the turbine of the present invention.

Fig. 4 is a cross-sectional view along A-A direction in Fig. 3 .

Fig. 5 is a top structural schematic diagram of the turbine.

Fig. 6 is a graph showing particle size analysis results of lead powder produced by a prior art lead powder machine.

Fig. 7 is the particle size analysis result diagram of the lead powder produced by the lead powder machine of the present invention.

detailed description

Example 1

As shown in Figures 1 to 5, a lead powder machine includes a main machine 1, which has a rotating drum 101 inside the main machine 1. The feed port of the main machine 1 is connected with a lead particle storage bin 2, and the discharge port is connected with a discharge pipe. A screening device 5 is installed on the discharge pipe, and the screening device 5 includes a volute 501. The volute 501 has an air inlet 502 and an air outlet 503. The discharge pipe is divided into two sections by the screening device 5, which are respectively connected to the air inlet 502 The feed pipe 3 and the discharge pipe 4 connected with the air outlet 503 . The other end of the discharge pipe 4 is connected to the powder collector 6, and the powder collector 6 includes a cloth bag 601 for separating the lead powder from the air flow, a negative pressure blower 602 that provides power for the lead powder in the main engine 1 to enter the powder collector 6, and the lead powder The powder is output from the powder outlet of the powder collector 6 to the auger 603 for storage in the subsequent process.

The volute 501 is in the shape of a cylinder, the bottom of which is tapered radially, and the bottom end is provided with a material return port 510 , the air inlet 502 is provided on the side of the volute 501 , and the air outlet 503 is provided on the top end surface of the volute 501 . The volute 501 is provided with a turbine 504, the turbine 504 is annular, the center has an air inlet channel 505 connected with the air outlet 503, and the surrounding side is provided with blades 506 arranged around the air inlet channel 505, and there are connecting inlets between adjacent blades 506. The gap 512 of the wind channel 505 . The top end surface of the worm gear 504 fits with the inner wall of the volute 501 , and the two keep a tight fit during the rotation of the worm gear 504 . The turbine 504 has a rotating shaft 507 extending out of the volute 501 through the air outlet 503 , and the end of the air inlet channel 505 near the air outlet 503 is provided with a cross 513 connected to the rotating shaft 507 . A protective cover 508 surrounding the rotating shaft 507 is provided outside the volute 501 , and the protective cover 508 is connected to the discharge pipe 4 . One end of the rotating shaft 507 is connected with a motor 509 for driving the turbine 504 to rotate.

The discharge port of the main engine 1 is equipped with a return auger 8 , and the feed end of the discharge pipe 3 and the bottom of the volute 501 are connected to the return auger 8 . The bottom of the volute 501 is connected to the return auger 8 through the feed valve 511 . The feeding valve 511 is a standard part, also known as the rotary feeding valve, which has the function of airtight sealing and powder feeding, which can not only ensure the smooth delivery of large particle size lead powder to the return auger 8, but also ensure that the volute 501 No wind can pass through the bottom, so as to prevent the wind from raising the settled large-size lead powder again. In order to ensure that the lead powder in the discharge pipe does not accumulate and prevent the lead powder from blocking the discharge pipe, a vibration motor 301 and a vibration motor 401 are installed on the discharge pipe 3 and the discharge pipe 4 respectively.

The discharge pipe 4 is provided with a secondary air inlet, and an air inlet pipe 402 is installed at the secondary air inlet. The air inlet pipe 402 is provided with a flow regulating valve. High, the temperature of fresh air entering from the secondary air inlet is low, which can cool down the lead powder and airflow. The ambient temperature varies greatly throughout the year, and the air volume can be adjusted according to actual needs through the flow regulating valve on the secondary air inlet.

During production, lead grains enter the drum 101 of the main machine 1 continuously from the lead grain storage bin 2 according to the load of the main machine 1, and the lead grains collide, grind and oxidize in the drum 101 to produce lead powder. The lead powder in the drum 101 is lifted up under the action of the rotation of the drum 101 and the action of the powder lifting mechanism, and is sucked into the discharge pipe 3 under the action of the wind force generated by the negative pressure fan 602, and then enters the screening device 5 for particle size separation, filter. The motor 509 of the screening device 5 works, and the rotating shaft 507 drives the turbine 504 to rotate. After the airflow containing lead powder enters the inside of the volute 501, it enters the air inlet channel 505 inside the turbine 504. Under the action of the centrifugal force generated by the rotation of the turbine 504, the airflow The lead powder with a sufficiently large medium particle size moves radially, is thrown out of the turbine 501 through the gap 512 between the blades 506, begins to settle at or near the inner wall of the volute 501, and is finally collected in the volute 501. The bottom is fed into the drum 101 of the main machine 1 by the feeding auger 8 through the feeding valve 511 for further grinding; while the lead powder with a smaller particle size is driven by the airflow from the upper end of the air inlet channel 505 due to the smaller centrifugal force. Out of the air outlet 503, then into the discharge pipe 4 and into the powder collector 6, the air flow is separated from the lead powder under the action of the cloth bag 601, and the lead powder is driven by the auger 603, and is output to the powder outlet through the powder collector 6. Storage in the later stage of the process. Thereby producing lead powder with finer particle size and smaller distribution span.

The rotating speed of the turbine 504 is adjustable through the frequency conversion of the motor 509. Under other conditions remaining unchanged, different rotating speeds will cause lead powders of different particle sizes to pass through the screening device 5. The higher the rotating speed, the smaller the particle size of the lead powder passing through the screening device 5. , and vice versa.

Example 2

The lead powder produced by the lead powder machine that the screening device is installed in embodiment 1 and the lead powder produced by the lead powder machine (both other results are the same) that do not install the screening device in the prior art carry out lead powder particle size analysis respectively, particle size analysis Using a laser particle size analyzer (winner2000ZD), the analysis steps are as follows:

1. Under the same environmental conditions (24°C, 35% relative humidity), test the two samples before and after improvement, and weigh the two samples with the same mass;

2. The advanced water reaches the water level line, and then perform ultrasonication and stirring to fully disperse the sample particles. After the full dispersion, perform a formal circulation + ultrasonic test. After the data and spectral lines are stable, save the data, export the results, and finally perform a test on the instrument. Rinse, the experiment is over.

The dispersant and dispersion medium selected in the test are both water. The measuring range is 0.6-120μm, the stirring position is 6, and the ultrasonic time is 60s.

Result is shown in Table 1～3 and Fig. 6 and 7, and table 1 and Fig. 6 are the particle size distribution situation of the lead powder that uses prior art (not installing screening device) to produce; Table 2 and Fig. 7 use lead powder of the present invention The particle size distribution of the lead powder produced by the machine; Table 3 is some data comparison between the two, D10, D50, D80, D90, D99 respectively refer to the cumulative volume of lead powder (that is, the total volume of all lead powders whose particle size is not greater than a specific value ) reaches 10%, 50%, 80%, 90%, and 99% of the particle size, S/V represents the specific surface area of the lead powder, and Dav represents the average particle size. The particle size distribution of the lead powder produced by the existing technology (without installing a screening device) is obviously wider and uneven, and the volume ratio of small particles and large particles of lead powder has a large gap. The particle size of the lead powder produced by the lead powder machine of the present invention is relatively stable in the small particle size range, the particle size span is small, the distribution interval is stable, the particle size distribution can reach uniformity, and the volume content of large particles is basically zero.

Table 1 uses the particle size distribution of the lead powder produced by the prior art.

Particle size μm volume% accumulation% Particle size μm volume% accumulation% Particle size μm volume% accumulation% 0.12 0.00 0.00 1.83 10.18 27.23 27.63 1.98 93.52 0.15 0.00 0.00 2.22 12.98 40.21 33.54 2.06 95.58 0.18 0.00 0.00 2.70 12.87 53.08 40.72 1.90 97.48 0.22 0.00 0.00 3.28 8.26 61.34 49.43 1.40 98.87 0.26 0.00 0.00 3.98 4.59 65.92 60.00 0.66 99.54 0.32 0.00 0.00 4.83 3.13 69.06 72.84 0.24 99.78 0.39 0.00 0.00 5.86 2.49 71.55 88.42 0.12 99.91 0.47 0.00 0.00 7.11 2.39 73.94 107.33 0.09 100.00 0.57 0.00 0.00 8.64 2.78 76.72 120.00 0.00 100.00 0.69 1.67 1.67 10.48 3.27 79.99 158.17 0.00 100.00 0.84 2.48 4.15 12.73 3.48 83.47 192.00 0.00 100.00 1.02 3.21 7.36 15.45 3.19 86.66 233.07 0.00 100.00 1.24 4.20 11.57 18.75 2.67 89.34 282.93 0.00 100.00 1.51 5.48 17.05 22.76 2.21 91.54 300.00 0.00 100.00

Table 2 uses the particle size distribution of the lead powder produced by the lead powder machine of the present invention.

Particle size μm volume% accumulation% Particle size μm volume% accumulation% Particle size μm volume% accumulation% 0.12 0.00 0.00 1.83 26.49 53.43 27.63 0.00 100.00 0.15 0.00 0.00 2.22 24.98 78.41 33.54 0.00 100.00 0.18 0.00 0.00 2.70 16.62 95.03 40.72 0.00 100.00 0.22 0.00 0.00 3.28 4.67 99.70 49.43 0.00 100.00 0.26 0.00 0.00 3.98 0.24 99.94 60.00 0.00 100.00 0.32 0.00 0.00 4.83 0.06 100.00 72.84 0.00 100.00 0.39 0.00 0.00 5.86 0.00 100.00 88.42 0.00 100.00 0.47 0.00 0.00 7.11 0.00 100.00 107.33 0.00 100.00 0.57 0.00 0.00 8.64 0.00 100.00 120.00 0.00 100.00 0.69 0.98 0.98 10.48 0.00 100.00 158.17 0.00 100.00 0.84 1.47 2.45 12.73 0.00 100.00 192.00 0.00 100.00 1.02 1.90 4.35 15.45 0.00 100.00 233.07 0.00 100.00 1.24 7.34 11.69 18.75 0.00 100.00 282.93 0.00 100.00 1.51 15.25 26.94 22.76 0.00 100.00 300.00 0.00 100.00

Table 3 Comparison of two kinds of lead powder data.

Production of lead powder by prior art Lead powder machine of the present invention produces lead powder D10 1.16μm 1.19μm D50 2.59μm 1.79μm D80 - 2.27μm D90 19.96μm 2.55μm D99 51.44μm 3.19μm S/V 25334.97cm ² /cm ³ 35947.22cm ² /cm ³ David 7.22μm 1.83μm

Claims (8)

1. a kind of lead-power machine, including main frame and discharge nozzle, it is characterised in that screening plant is provided with the discharge nozzle, described Screening plant includes being provided with the spiral case with air inlet and air outlet, spiral case by motor-driven turbine, and the turbine is in ring Shape, center has the air intake passage being connected with air outlet, and the week side of boss is provided around between the blade of air intake passage setting, adjacent blades Gap with connection air intake passage.

2. lead-power machine as claimed in claim 1, it is characterised in that the spiral case is cylindrical in shape, bottom radially reduces tapered, bottom End is provided with feedback outlet, and the air inlet is located at the side of spiral case, and air outlet is located at the top end face of spiral case.

3. lead-power machine as claimed in claim 2, it is characterised in that the top end face of the turbine is engaged with spiral case inwall.

4. lead-power machine as claimed in claim 1, it is characterised in that have on the turbine through air outlet and stretch out outside spiral case Rotating shaft, the scroll outer connects the discharge nozzle provided with the protective cover for surrounding rotating shaft, protective cover.

5. lead-power machine as claimed in claim 4, it is characterised in that the air intake passage is close to the end of air outlet provided with connection The cross of rotating shaft.

6. lead-power machine as claimed in claim 1, it is characterised in that the discharging opening of the main frame is provided with return material packing auger, described The feed end of discharge nozzle and the bottom of spiral case are all connected with return material packing auger.

7. lead-power machine as claimed in claim 6, it is characterised in that the spiral case bottom connects return material packing auger by baiting valve.

8. lead-power machine as claimed in claim 1, it is characterised in that the turbine two ends are provided with the end cap of fixed blade, end cap Center has through hole.