Model selection test method and device for double-geared roller crusher for crushing strip mine stripping substances

Abstract

The invention discloses a double-geared roller crusher type selection test method and device for an open pit coal mine stripping object. The method comprises the following steps: a, material preparation work before a test; b, starting the test device; c, testing and recording; and d, processing test data. A device for realizing the method comprises a stock bin, a feeding machine, a double-geared roller crusher, an auxiliary steel structure, a crushing bin, a discharging hopper, an electric control system, a weighing device and a granularity detection instrument. The method has the advantages that the processing capacity and the specific power consumption of the industrial double-geared roller crusher under different physical characteristics such as rock strength, rock density and material ratio can be obtained, compared with a traditional method for determining the two parameters according to an empirical formula, the accuracy is higher, and through comparison with actual engineering data, the processing capacity and the specific power consumption of the industrial double-geared roller crusher are greatly improved. The processing capacity and specific power consumption of the double-geared-roller crusher of the same model under different physical characteristics of stripped materials can be effectively obtained, the accuracy of designing and selecting the double-geared-roller crusher is improved, and the problems caused by selecting errors are avoided.

Description

Technical Field

[0001] The invention relates to the field of machinery, in particular to the field of crushing technology, and more particularly to a double-toothed roller crusher selection test method and device. Background Art

[0002] my country's coal has always been the ballast stone of national energy security. Open-pit coal mining has entered a new stage of development due to its significant characteristics such as large production scale, high labor productivity and high resource recovery rate. With the continuous advancement of semi-continuous mining technology, the large-scale development of mobile / semi-mobile crushing systems has been rapid. Double-toothed roller crushers have been widely used in the coal field due to their excellent crushing performance and applicability.

[0003] In the process of selecting double-toothed roller crushers for crushing open-pit mine strippings, the processing capacity of the equipment cannot be known according to the machinery industry standard "Double-toothed roller crushers for mining" (a range is given in the standard), so the processing capacity and the driving motor power are mainly calculated by empirical formulas. Generally, the processing capacity is obtained by calculating the total volume of materials passing between the two crushing rollers per unit time and then multiplying it by the bulk density of the materials. In order to be closer to reality, some calculation formulas add correction factors such as loose coefficients.

[0004] However, due to the existence of multiple empirical formulas, there are differences in the calculation results using different formulas. In addition, the open-pit mine stripping materials have large differences in rock strength, material ratio and other material parameters due to different regions, and the empirical formula does not take the above factors into account. Therefore, it is difficult for designers to determine these two performance indicators. Once the selection is inaccurate or the motor power does not match, there will be problems such as production capacity not meeting the standards, or increased investment costs and energy consumption. Summary of the invention

[0005] In order to ensure that the double-toothed roller crusher reaches the design indicators, understand the differences in production capacity and required electrical power of the same model of double-toothed roller crusher for different open-pit mine crushing materials, reduce investment costs, and achieve energy conservation and consumption reduction, it is necessary to test the open-pit mine stripping materials, and measure the crusher's processing capacity and specific power consumption for specific stripping materials through the selection test system, which is used to assist in determining the processing capacity and motor power of the double-toothed roller crusher.

[0006] The purpose of the present invention is to provide a double-toothed roller crusher selection test method and device for open-pit coal mine strippings, determine the model and specifications of industrial double-toothed roller crushers by testing the processing capacity of the test device to crush open-pit mine strippings, and determine the grindability of materials by measuring the energy consumption of different open-pit mine strippings in the test device, so as to determine the motor power required for industrial double-toothed roller crushers. The specific technical scheme is as follows:

[0007] A double-toothed roller crusher selection test method for open-pit coal mine stripping includes the following steps:

[0008] a. Material preparation before the test: prepare 2000kg of test material according to the actual material ratio of the open-pit mine stripping material, put it in multiple woven bags, and place it next to the silo;

[0009] b. Start the test device: start the feeder and double-toothed roller crusher in sequence through the electronic control system;

[0010] c. Test and record: Pour the test materials into the silo in an orderly manner, and use a stopwatch to record the time T (s) required for the double-toothed roller crusher to crush 2000kg of materials; before and after the test, record the power W of the electric meter driving the double-toothed roller crusher. 1 and W 2 ; Use a particle size detection instrument to detect the bulk size of the removed material (≥50mm×50mm×50mm), weigh and record.

[0011] d. Processing of test data:

[0012] (1) Output per unit time q: Based on the time T (s) used to crush 2000 kg of material, calculate the hourly processing capacity, q = 2000 / T (kg / s) = 7200 / T (t / h);

[0013] (2) Calculation of unit power consumption W: Subtract the power in the meter before and after the test to obtain the test power consumption W 3 =W 2 -W 1 , and then calculate the power required to process each ton of material, that is, specific power consumption W = W 3 / 2(kWh / t);

[0014] (3) Bulk material weight percentage η: Calculate the percentage of bulk material weight to the weight of the test material η%;

[0015] (4) Material influence coefficient on processing capacity K: K = q / q 1 ;q 1 is the processing power of the calculation, and its calculation formula is q 1 =60πnaLmρk, where: q 1 —Production capacity, t / h; n—tooth roller speed, r / min; a—roller center distance, m; L—crushing effective length, m; m—discharge particle size, m; ρ—material bulk density, t / m 3 ; k—material filling coefficient;

[0016] (5) The processing capacity of a certain type of double-toothed roller crusher is Q: Q = K × q 1 .

[0017] The bulk material refers to a material whose length, width and height are all greater than or equal to 50 mm.

[0018] It also includes step e. application of test data:

[0019] The unit time output q and unit power consumption W are calculated by the test, and the influence of the physical properties of the stripping materials such as rock strength, material density, and material gradation on the production capacity and specific power consumption is summarized;

[0020] Through calculation, the coefficient K of the material's influence on the processing capacity is obtained. When selecting industrial models, this coefficient is multiplied by the theoretical processing capacity calculated according to the formula to obtain the processing capacity that can be achieved by crushing the test material.

[0021] The percentage of bulk material weight to the test material should not exceed 5% to verify whether the roller gap of the double-toothed roller crusher is reasonable.

[0022] The present invention further discloses a device for implementing the method, comprising a silo, a feeder, a double-toothed roller crusher, an auxiliary steel structure, a crushing bin, a discharge hopper, an electric control system, a weighing device, and a particle size detection instrument; the silo is supported on the auxiliary steel structure, the feeder is below the silo, the crushing bin is on the right side of the silo, the center distance double-toothed roller crusher is directly below the crushing bin, and the discharge hopper is below the center distance double-toothed roller crusher; the silo, feeder, crushing bin, discharge hopper and double-toothed roller crusher are all installed on the auxiliary steel structure.

[0023] Compared with the prior art, the present invention has the following advantages: the present invention adopts a special selection test system to obtain the processing capacity and specific power consumption of industrial double-toothed roller crushers under different physical characteristics such as rock strength, rock density, and material ratio through testing. Compared with the traditional empirical formula to determine these two parameters, the present invention has a higher accuracy. By comparing with actual engineering data, the processing capacity and specific power consumption of the same type of double-toothed roller crusher under different physical characteristics of stripped materials (rock strength, material density, material ratio, etc.) can be effectively obtained, which improves the accuracy of designing and selecting double-toothed roller crushers and avoids problems caused by selection errors. Through experiments, it can also be verified what the proportion of large block materials passing through is when the feed size and discharge size are determined.

[0024] The invention will be widely applied in the technical field of double-toothed roller crushers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0026] Figure 2 yes Figure 1 3D view of the . DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0028] Refer to the attached Figure 1-2 :

[0029] A device for implementing the method comprises a silo 1, a feeder 2, a double-toothed roller crusher 3, an auxiliary steel structure 4, a crushing bin 5, a discharge hopper 6, an electric control system, a weighing device, and a particle size detection instrument; the silo 1 is supported on the auxiliary steel structure, the feeder 2 is below the silo 1, the crushing bin 5 is on the right side of the silo 1, the center distance double-toothed roller crusher 3 is directly below the crushing bin 5, and the discharge hopper 6 is below the center distance double-toothed roller crusher 3; the silo 1, the feeder 2, the crushing bin 5, the discharge hopper 6 and the double-toothed roller crusher 3 are all installed on the auxiliary steel structure 4.

[0030] 1. Silo:

[0031] The silo is a welded steel structure, which is arranged above the feeder and on the auxiliary steel structure. It has the function of blocking materials to prevent them from overflowing.

[0032] 2. Feeder:

[0033] The feeder adopts a conventional plate feeder and is installed on the auxiliary steel structure.

[0034] 3. Crushing chamber:

[0035] The crushing chamber is a welded structure. The crushed material leaves the feeder and enters the crushing chamber and begins to fall into the double-toothed roller crusher. The crushing chamber is installed on the auxiliary steel structure.

[0036] 4. Double-toothed roller crusher:

[0037] The screening type double-toothed roller crusher is mainly composed of motor, reducer, toothed roller and machine body. The double-toothed roller crusher is installed on the auxiliary steel structure.

[0038] 5. Discharge hopper:

[0039] The discharge hopper is a welded steel structure in the form of a funnel, fixed to an auxiliary steel structure.

[0040] 6. Auxiliary steel structure:

[0041] The auxiliary steel structure is a welded structure used to support other components in the test system and provide a ladder platform for test personnel to feed materials. The auxiliary steel structure itself is supported on the cement floor.

[0042] The specific use steps of the present invention are:

[0043] a. Material preparation before the test: Understand and record the physical properties of the stripping material, including the uniaxial compressive strength of the rock, the density of the ore, etc., crush and screen the stripping material, select the rock with a finished particle size of ≤250mm×250mm×250mm, mix it with sand and soil according to the actual material ratio of the open-pit mine stripping material (data comes from the open-pit mine) and record the ratio data, prepare 2000kg of stripping material that meets the test requirements by weighing, put it in multiple woven bags, and place it next to silo 1.

[0044] b. Start the test device: start the feeder 2 and the double-toothed roller crusher 3 in sequence through the electronic control system.

[0045] c. Test and record: Pour the material in the woven bag into the silo 1 in an orderly manner over a period of about 2 minutes. When the material leaves the feeder 2 and enters the crushing bin 6 or the double-toothed roller crusher 3, start timing with a stopwatch. When 2000 kg of material is crushed, stop timing and record the time T (s) required to crush 2000 kg of material. Before and after the test, record the amount of electricity W1 and W2 in the electric meter respectively. Use a particle size detection instrument to detect the size of the large pieces of material (≥50mm×50mm×50mm), weigh and record.

[0046] d. Processing of test data:

[0047] (1) Output per unit time q: Based on the time T (s) used to crush 2000 kg of material, calculate the hourly processing capacity, q = 2000 / T (kg / s) = 7200 / T (t / h);

[0048] (2) Calculation of unit power consumption W: Subtract the power in the meter before and after the test to obtain the test power consumption W 3 =W 2 -W 1 , and then calculate the power required to process each ton of material, that is, specific power consumption W = W 3 / 2(kWh / t);

[0049] (3) Bulk material weight percentage η: Calculate the percentage of bulk material weight to the weight of the test material η%;

[0050] (4) Material influence coefficient on processing capacity K: K = q / q 1 ;q 1 is the processing power of the calculation, and its calculation formula is q 1 =60πnaLmρk, where: q 1 —Production capacity, t / h; n—tooth roller speed, r / min; a—roller center distance, m; L—crushing effective length, m; m—discharge particle size, m; ρ—material bulk density, t / m 3 ; k—material filling coefficient;

[0051] (5) The processing capacity of a certain type of double-toothed roller crusher is Q: Q = K × q 1 .

[0052] The bulk material refers to a material whose length, width and height are all greater than or equal to 50 mm.

[0053] It also includes step e. application of test data:

[0054] The unit time output q and unit power consumption W are calculated by the test, and the influence of the physical properties of the stripping materials such as rock strength, material density, and material gradation on the production capacity and specific power consumption is summarized;

[0055] Through calculation, the coefficient K of the material's influence on the processing capacity is obtained. When selecting industrial models, this coefficient is multiplied by the theoretical processing capacity calculated according to the formula to obtain the processing capacity that can be achieved by crushing the test material.

[0056] The percentage of bulk material weight to the test material should not exceed 5% to verify whether the roller gap of the double-toothed roller crusher is reasonable.

Claims

1. A double-toothed roller crusher selection test method for open-pit coal mine stripping, characterized in that The method comprises the following steps: a. Material preparation before the test: prepare 2000kg of test material according to the actual material ratio of open-pit mine stripping; b. Start the test device: start the feeder 2 and the double-toothed roller crusher 3 in sequence; c. Test and record: pour the test materials into the silo in an orderly manner, and use a stopwatch to record the time T required for the double-toothed roller crusher to crush 2000kg of materials; before and after the test, record the power W1 and W2 of the electric meter driving the double-toothed roller crusher respectively; use a particle size detection instrument to detect the size of the large pieces of the removed materials, weigh them and record them; d. Processing of test data: (1) Output per unit time q: Based on the time T (s) used to crush 2000 kg of material, calculate the hourly processing capacity, q = = 7200 / T (t / h); (2) Calculation of unit power consumption W: Subtract the power in the electric meter before and after the test to obtain the test power consumption W3 = W2-W1, and then calculate the power required to process each ton of material, that is, specific power consumption W = W3 / 2 (kWh / t); (3) Bulk material weight percentage η: Calculate the percentage of bulk material weight to the weight of the test material η%; (4) Material influence coefficient K on processing capacity: K = q / q1; q1 is the calculated processing capacity, and its calculation formula is q1 = 60πnaLmρk, where: q1 - production capacity, t / h; n - tooth roller speed, r / min; a - roller center distance, m; L - crushing effective length, m; m - discharge particle size, m; ρ - material bulk density, t / m 3 ; k—material filling coefficient; (5) The processing capacity Q of a certain type of double-toothed roller crusher: Q = K × q1.

2. The double-toothed roller crusher selection test method for open-pit coal mine stripping according to claim 1 is characterized in that: The bulk material refers to a material whose length, width and height are all greater than or equal to 50 mm.

3. The double-toothed roller crusher selection test method for open-pit coal mine stripping according to claim 1, characterized in that: It also includes step e. application of test data: The unit time output q and unit power consumption W are calculated by the test, and the influence of the physical properties of the stripping materials such as rock strength, material density, and material gradation on the production capacity and specific power consumption is summarized; Through calculation, the coefficient K of the material's influence on the processing capacity is obtained. When selecting industrial models, this coefficient is multiplied by the theoretical processing capacity calculated according to the formula to obtain the processing capacity that can be achieved by crushing the test material. The percentage of bulk material weight to the test material should not exceed 5% to verify whether the roller gap of the double-toothed roller crusher is reasonable.

4. A device for implementing the method of claim 1, characterized in that: It includes silo, feeder, double-toothed roller crusher, auxiliary steel structure, crushing bin, discharge hopper, electric control system, weighing device and particle size detection instrument; the silo is supported on the auxiliary steel structure, the feeder is below the silo, the crushing bin is on the right side of the silo, the center distance double-toothed roller crusher is directly below the crushing bin, and the discharge hopper is below the center distance double-toothed roller crusher. The silo, feeder, crushing bin, discharge hopper and double-toothed roller crusher are all installed on the auxiliary steel structure.

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