A coal conveying and tamping device for coking experiments

Abstract

The utility model relates to a coal delivery and tamping device for coking test, comprising a bucket elevator, a coal mixing mechanism, a tamping mechanism, and a coal box transfer mechanism. The bucket elevator is used to deliver the required coal sample into the coal mixing mechanism; the coal mixing mechanism comprises a mixing box, a stirring motor, and a stirring paddle. The telescopic rod of the hydraulic cylinder on the mixing box is connected to the box cover, and a stirring paddle is arranged in the mixing box; the tamping mechanism comprises a tamping hammer, a servo electric cylinder, and a bracket. The servo electric cylinder is fixedly connected to the bracket, and the servo electric cylinder drives the tamping hammer to rise and fall; the coal box transfer mechanism comprises a track, a coal box, and a mobile trolley. The coal box is arranged on the mobile trolley, and the mobile trolley can move between the bottom of the mixing box and the bottom of the tamping hammer. The advantages are: reasonable design, simple use, easy operation, strong practicality, high stability, and the whole process operation from coal delivery and mixing to coal sample tamping is realized, which reduces the workload of operators and improves the efficiency of coal cake forming.

Description

Technical Field

[0001] The utility model belongs to the field of coking, and relates to a coal conveying and tamping device used for coking experiments. Background Art

[0002] At present, it is still difficult to accurately predict the quality of coke from coal quality indicators. Using coking tests to simulate coke production is an important way to optimize the coal blending scheme. Therefore, coking tests have been widely used in related research. The ramming coking process is a method that can increase the content of high volatile matter, weakly caking or even non-caking coal in the coal blending to expand the raw coal resources for coking. This method is often used in coking tests to make coal cakes in order to achieve a bulk density close to that of coal samples in coking production.

[0003] The traditional coal delivery and tamping process is coal powder crushing and screening, adding water for uniform mixing, and coal loading and tamping. The entire process requires manual participation, which is labor-intensive and inefficient. Due to the different operating habits of different operators, the density of the coal cake after tamping will fluctuate greatly, affecting the final coke quality, thereby reducing the guiding significance of the test results for production. Summary of the invention

[0004] The utility model aims to provide a coal conveying and tamping device for coking experiments, which can improve the coal conveying and tamping efficiency and reduce the fluctuation of coal cake bulk density.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A coal conveying and tamping device for coking experiments comprises a bucket elevator, a coal mixing mechanism, a tamping mechanism, and a coal box transfer mechanism, wherein the bucket elevator is used to convey the required coal sample into the coal mixing mechanism;

[0007] The coal mixing mechanism comprises a mixing box, a stirring motor, a stirring paddle, a hydraulic cylinder and a box cover. The top of the mixing box is provided with a box cover, the mixing box is connected with a hydraulic cylinder, the telescopic rod of the hydraulic cylinder is connected with the box cover, the mixing box is provided with a stirring paddle, the stirring motor is used to drive the stirring paddle to rotate, and the bottom of the mixing box is provided with a discharge port;

[0008] The tamping mechanism comprises a tamping hammer, a servo electric cylinder and a bracket, wherein the servo electric cylinder is fixedly connected to the bracket, the servo electric cylinder is connected to the tamping hammer, and the servo electric cylinder drives the tamping hammer to rise and fall;

[0009] The coal box transfer mechanism includes a track, a coal box, and a mobile trolley. The coal box is arranged on the mobile trolley. The track is fixed on the foundation between the mixing box and the tamping hammer. The mobile trolley is connected to the track so that the mobile trolley can move between under the mixing box and under the tamping hammer.

[0010] The box cover is hinged to the mixing box, and the telescopic rod of the hydraulic cylinder is hinged to the box cover.

[0011] The box cover is connected with a water spray nozzle.

[0012] The discharge port is connected with a valve.

[0013] It also includes an optical axis. The bracket is provided with a through hole, and the optical axis passes through the through hole and is fixedly connected with the tamping hammer.

[0014] The tamping hammer is a flat plate structure with a threaded hole in the middle for connection with the push rod of the servo electric cylinder; blind holes are formed around the tamping hammer for fixed connection with the optical axis.

[0015] The optical axis is arranged around the tamping hammer.

[0016] The mobile trolley is provided with an electronic scale.

[0017] A placing rack is fixed on the electronic scale.

[0018] The mobile trolley is driven by a horizontal moving mechanism; the horizontal moving mechanism includes a variable frequency motor, a ball screw pair, and a guide shaft. The variable frequency motor is connected to the screw of the ball screw pair, the nut of the ball screw pair is fixedly connected to the mobile trolley, the guide shaft is arranged on both sides of the ball screw pair, and the guide shaft is slidably connected to the mobile trolley.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The utility model has reasonable design, simple use, easy operation, strong practicality and high stability, and realizes the whole process operation from coal delivery and mixing to coal sample tamping, which reduces the workload of operators and improves the efficiency of coal cake forming.

[0021] 2. The tamping mechanism is powered by a servo electric cylinder to drive the tamping hammer up and down, achieving stable and constant pressure output, solving the problem of large fluctuations in coal cake density caused by manual tamping. At the same time, the tamping pressure, tamping time and tamping times can be controlled. The tamping hammer can be disassembled and replaced, and can meet the tamping needs of coking tests of different specifications.

[0022] 3. The coal mixing mechanism feeds materials through a bucket elevator, and can proportion different coal samples added and mix them evenly in the coal mixing mechanism, so as to ensure that the raw materials are mixed evenly. The materials are then sent to the tamping mechanism by the coal box transfer mechanism, and the mixture is weighed in the coal box transfer mechanism to ensure that the tamping amount is the same for multiple times, thereby reducing the fluctuation of the coal cake bulk density. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a layout diagram of the utility model.

[0024] Figure 2 It is a structural schematic diagram of the utility model.

[0025] Figure 3 It is a structural diagram of the horizontal moving mechanism.

[0026] Figure 4 It is the front view of the tamping hammer.

[0027] Figure 5 It is a top view of the tamping hammer.

[0028] Figure 6 It is the main circuit diagram of the control system.

[0029] Figure 7 It is a schematic diagram of the control system PLC principle.

[0030] Figure 8 It is the control loop of the control system Figure 1 .

[0031] Fig. 9 It is the control loop of the control system Figure 2 .

[0032] In the figure: 1- bucket elevator 2- coal mixing mechanism 3- stirring motor 4- tamping mechanism 5- coal box transfer mechanism 6- control panel 7- fence 8- coal loading bucket 9- lifting motor 10- box cover 11- mixing box 12- stirring paddle 13- discharge port 14- hydraulic switch cover hydraulic system 15- servo electric cylinder 16- optical axis 17- tamping hammer 18- bracket 19- coal box 20- placement rack 21- electronic scale 22- mobile trolley 23- track 24- guide shaft 25- frequency conversion motor 26- ball screw pair 27- threaded hole 28- blind hole. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0034] See Figure 1-Figure 2 A coal conveying and tamping device for coking experiments includes a bucket elevator 1, a coal mixing mechanism 2, a tamping mechanism 4, and a coal box transfer mechanism 5. The bucket elevator 1 is arranged at the front end, and the tamping mechanism 4 and the coal box transfer mechanism 5 are arranged at the rear end. The initial position of the mobile trolley 22 is directly below the tamping hammer 17 of the tamping mechanism 4.

[0035] The coal loading bucket 8 of the bucket elevator 1 is driven by a lifting motor 9 to move the coal loading bucket 8 up and down along the track. The weighed coal sample is sent into the coal loading bucket 8 and lifted into the coal mixing mechanism 2.

[0036] The coal mixing mechanism 2 includes a mixing box 11, a stirring motor 3, a stirring paddle 12, a hydraulic cylinder, and a box cover 10. The top of the mixing box 11 is provided with a box cover 10, and the box cover 10 is hinged to the mixing box 11. The mixing box 11 is connected to a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is hinged to the box cover 10. The hydraulic cylinder drives the box cover 10 to open and close. A stirring paddle 12 is provided in the mixing box 11, and the stirring motor 3 is used to drive the stirring paddle 12 to rotate. A discharge port 13 is provided at the bottom of the mixing box 11, and a valve is connected to the discharge port 13. There are two stirring paddles 12, which are driven by a stirring motor 3. A gear is fixedly connected to each of the two stirring paddles 12, and the two gears are meshed with each other. The output shaft of the stirring motor 3 is fixedly connected to one stirring paddle 12. A water nozzle is connected to the box cover 10 for adding water to the mixing box 11.

[0037] See Figure 1-Figure 2 , Figure 4-Figure 5 The tamping mechanism 4 includes a tamping hammer 17, a servo electric cylinder 15, and a bracket 18. The servo electric cylinder 15 is fixedly connected to the bracket 18. The servo electric cylinder 15 is connected to the tamping hammer 17, and the servo electric cylinder 15 drives the tamping hammer 17 to rise and fall. The bracket 18 is provided with four through holes, and the optical axis 16 passes through the through holes and is fixedly connected to the tamping hammer 17. The tamping hammer 17 is a flat plate structure, with a threaded hole 27 in the middle, which is used to be connected to the push rod of the servo electric cylinder 15; the optical axis 16 is arranged around the tamping hammer 17, and the tamping hammer is provided with blind holes 28 (with threads) around it, which are used to be fixedly connected to the optical axis. The bottom end of the optical axis 16 is threaded, and the four optical axes 16 are threadedly fixed to the tamping hammer 17. The bottom end of the push rod of the servo electric cylinder 15 is also threaded, and the push rod is threadedly fixed to the tamping hammer 17. The lifting and lowering of the push rod of the servo electric cylinder 15 drives the tamping hammer 17 to lift and lower, and the optical axis 16 also lifts and lowers accordingly, and slides in the through hole of the bracket 18, so that the tamping hammer 17 can be lifted and lowered smoothly.

[0038] The coal box transfer mechanism 5 includes a track 23, a coal box 19, and a mobile trolley 22. The coal box 19 is arranged on the mobile trolley 22. The track 23 is fixed on the foundation between the mixing box 11 and the tamping hammer 17. The mobile trolley 22 is connected to the track 23 so that the mobile trolley 22 can move between below the mixing box 11 and below the tamping hammer 17. An electronic scale 21 is arranged on the mobile trolley 22, and a placement rack 20 is fixed on the electronic scale 21. The coal box 19 is placed on the placement rack 20.

[0039] See Figure 3 The moving trolley 22 is driven by a horizontal moving mechanism. The horizontal moving mechanism includes a variable frequency motor 25, a ball screw pair 26, and a guide shaft 24. The variable frequency motor 25 is connected to the screw of the ball screw pair 26, the nut of the ball screw pair 26 is fixedly connected to the moving trolley 22, and the guide shaft 24 is arranged on both sides of the ball screw pair 26, and the guide shaft 24 is slidably connected to the moving trolley 22.

[0040] In addition, a fence 7 is installed outside the coal conveying and tamping device used in the coking test, and the operator uses the control panel 6 outside the fence 7 to set the operating parameters and control the operation of the device.

[0041] See Figure 6-Figure 9 The control system of the coal delivery and tamping device used for the coking experiment includes a PLC controller, which is connected to the oil pump motor, the lifting motor 9, the stirring motor 3, the servo electric cylinder 15, and the frequency conversion motor 25 of the hydraulic switch cover hydraulic system 14. The mobile car 22 is driven by the frequency converter and the motor; the stirring paddle is driven by the frequency converter and the stirring motor 3; the electronic scale 21 communicates with the communication module 2 of the PLC controller. The servo electric cylinder 15 communicates with the communication module 1 of the PLC controller through the 485 module.

[0042] See Figure 1-Figure 9 , Coal delivery and tamping process of coking test:

[0043] 1. The operator sets the parameters on the control panel 6, opens the fence door 7 on one side of the bucket elevator 1, manually loads the weighed coal samples into the coal loading hopper 8 of the bucket elevator 1, and closes the fence door 7.

[0044] 2. Open the fence door 7 on the side of the tamping mechanism 4, place the coal box 19 on the placement rack 20, close the fence door 7, and use the control panel 6 to start the device.

[0045] 3. The hydraulic switch cover hydraulic system 14 in the coal mixing mechanism 2 drives the hydraulic cylinder to open the box cover 10. The motor of the bucket elevator 1 drives the coal loading bucket 8 to move upward along the track to the upper limit position, so that all the coal samples are poured into the mixing box 11. The motor drives the coal loading bucket 8 to move downward along the track to return to the initial position, and the hydraulic cylinder drives the box cover 10 to close.

[0046] 4. In the coal mixing mechanism 2, the stirring motor 3 drives the stirring paddle 12 to rotate forward for 3 minutes and then reverse for 3 minutes. At the same time, the water nozzle sprays water into the mixing box 11 according to the set water addition amount.

[0047] 5. During the coal mixing process, the variable frequency motor 25 of the horizontal moving mechanism operates, and the ball screw pair 26 is rotated to drive the moving trolley 22 to move to the bottom of the discharge port 13 of the mixing box 11. The cylinder drives the valve of the discharge port 13 to open until the value of the electronic scale 21 reaches the set value, and then the valve is closed. The horizontal moving mechanism drives the moving trolley 22 to move to the bottom of the unloading tamping hammer 17.

[0048] 6. The servo electric cylinder 15 of the tamping mechanism 4 drives the tamping hammer 17 to move downward along the optical axis 16 until the tamping hammer 17 presses on the coal sample and the electronic scale 21 reaches the set value and continues for the set time, and then moves up to the initial position.

[0049] 7. Repeat the above steps 5 and 6 until the set number of tamping times is completed, then stop the operation. Open the fence 7 door, and manually transfer the coal box 19 to the coking test preparation area.

[0050] The utility model has reasonable design, simple use, easy operation, strong practicality and high stability, and realizes the whole process operation from coal delivery and mixing to coal sample tamping, which reduces the workload of operators and improves the efficiency of coal cake forming. The coal mixing mechanism 2 feeds materials through the bucket elevator 1, and can proportion the added different coal samples and mix them in the coal mixing mechanism 2, so as to ensure that the raw materials are mixed evenly, and then the coal box transfer mechanism 5 sends them to the tamping mechanism 4, and the mixed materials are weighed in the coal box transfer mechanism 5 to ensure that the tamping amount is the same for multiple times, so as to reduce the fluctuation of the density of coal cakes.

Claims

1. A coal conveying and tamping device for coking experiments, characterized in that: It includes a bucket elevator, a coal mixing mechanism, a tamping mechanism, and a coal box transfer mechanism. The bucket elevator is used to deliver the required coal sample into the coal mixing mechanism; The coal mixing mechanism comprises a mixing box, a stirring motor, a stirring paddle, a hydraulic cylinder and a box cover. The top of the mixing box is provided with a box cover, the mixing box is connected with a hydraulic cylinder, the telescopic rod of the hydraulic cylinder is connected with the box cover, the mixing box is provided with a stirring paddle, the stirring motor is used to drive the stirring paddle to rotate, and the bottom of the mixing box is provided with a discharge port; The tamping mechanism comprises a tamping hammer, a servo electric cylinder and a bracket, wherein the servo electric cylinder is fixedly connected to the bracket, the servo electric cylinder is connected to the tamping hammer, and the servo electric cylinder drives the tamping hammer to rise and fall; The coal box transfer mechanism includes a track, a coal box, and a mobile trolley. The coal box is arranged on the mobile trolley. The track is fixed on the foundation between the mixing box and the tamping hammer. The mobile trolley is connected to the track so that the mobile trolley can move between under the mixing box and under the tamping hammer.

2. A coal conveying and tamping device for coking test according to claim 1, characterized in that: The box cover is hinged to the mixing box, and the telescopic rod of the hydraulic cylinder is hinged to the box cover.

3. A coal conveying and tamping device for coking test according to claim 1, characterized in that: The box cover is connected with a water spray nozzle.

4. A coal conveying and tamping device for coking experiments according to claim 1, characterized in that: The discharge port is connected with a valve.

5. A coal conveying and tamping device for coking test according to claim 1, characterized in that: It also includes an optical axis. The bracket is provided with a through hole, and the optical axis passes through the through hole and is fixedly connected with the tamping hammer.

6. A coal conveying and tamping device for coking experiments according to claim 5, characterized in that: The tamping hammer is a flat plate structure with a threaded hole in the middle for connection with the push rod of the servo electric cylinder; blind holes are formed around the tamping hammer for fixed connection with the optical axis.

7. A coal conveying and tamping device for coking test according to claim 5, characterized in that: The optical axis is arranged around the tamping hammer.

8. A coal conveying and tamping device for coking experiments according to claim 1, characterized in that: The mobile trolley is provided with an electronic scale.

9. A coal conveying and tamping device for coking experiments according to claim 8, characterized in that: A placing rack is fixed on the electronic scale.

10. A coal conveying and tamping device for coking experiments according to claim 1, characterized in that: The mobile trolley is driven by a horizontal moving mechanism; the horizontal moving mechanism includes a variable frequency motor, a ball screw pair, and a guide shaft. The variable frequency motor is connected to the screw of the ball screw pair, the nut of the ball screw pair is fixedly connected to the mobile trolley, the guide shaft is arranged on both sides of the ball screw pair, and the guide shaft is slidably connected to the mobile trolley.

Images