Hydraulic polishing integrated type coal sample manufacturing device and manufacturing method

Abstract

The present application relates to a kind of hydraulic polishing integrated briquette sample manufacturing device and manufacturing method.The device includes oil injection device, forming device, polishing device, pressure control device.The oil injection device includes oil injection pipe, oil injection plate and oil storage box;The forming device includes hydraulic press main body, hydraulic pump, oil tank, foam titanium oil infiltration mould and rotating base;The hydraulic press main body includes hydraulic cylinder, work platform, hydraulic press top plate and support column;The polishing device includes fixed rod, polishing slider, bottom fixed disc, spring, waste collection chassis;The pressure control device includes computer, signal transmitting station, pressure sensor, telescopic support rod.The hydraulic polishing integrated forming device of the present application can fully meet the process requirements of briquette sample forming, solve the difficulty of briquette demolding, the edge of briquette is easy to break, the problem that the pressure display is not quantitative in pressing process, can effectively improve the quality of briquette sample prepared.

Description

Technical Field

[0001] This invention proposes a coal briquette sample manufacturing equipment, aiming to provide an integrated hydraulic grinding device for pressing coal briquette samples and its manufacturing method. Background Technology

[0002] Coal is a vital resource, accounting for approximately 56% of my country's primary energy consumption. To mine coal and extract coalbed methane more safely and efficiently, research is needed on coal properties and permeability enhancement measures. Before laboratory testing, raw coal is processed into samples of the required size. However, some coals are too soft or contain numerous bedding planes, joints, and fractures, making it impossible to process them into the desired size. To address this challenge, raw coal is typically crushed, sieved, and then shaped into briquettes for laboratory research. These briquettes offer advantages such as good homogeneity and high controllability.

[0003] Using true triaxially loaded cubic specimens can effectively simulate complex geostress states. There are two main methods for pressing coal powder into cubic specimens: extrusion molding and compression molding. While extrusion molding allows for rapid production, it is difficult to control the size of the briquettes, requiring post-processing. Currently, compression molding is the primary method for producing cubic specimens. The briquette specimen manufacturing device designed in this invention belongs to compression molding. The method involves first placing coal powder into the mold cavity, then applying pressure through mold closing to solidify it, followed by demolding. However, during the briquette specimen pressing process, problems such as difficulty in demolding, easy breakage of edges and corners, and inaccurate pressure display during the pressing process are encountered. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a manufacturing apparatus and method for high-quality coal briquette samples.

[0005] To solve the above problems, the solution of the present invention is:

[0006] A hydraulically integrated coal briquette sample manufacturing device includes an oil injection device, a forming device, a grinding device, and a pressure control device.

[0007] The oil injection device injects oil into the molding device;

[0008] The forming device presses coal powder into shape under the control of the pressure control device, and sends the resulting coal briquette sample to the grinding device.

[0009] The grinding device grinds the coal briquette sample under the control of the pressure control device.

[0010] Furthermore, in the integrated hydraulic grinding coal sample manufacturing device: the oil injection device includes an oil injection pipe, an oil injection plate, and an oil storage box; the molding device includes a hydraulic press body, a hydraulic pump, an oil tank, a foam titanium oil-permeable mold, and a rotating base; the hydraulic press body includes a hydraulic cylinder, a press rod, a working platform, a hydraulic press top plate, and a support column; the grinding device includes a fixed rod, a grinding cavity, a grinding slider, a bottom fixed disc, a spring, and a waste collection chassis; the pressure control device includes a computer, a signal transmitter, a pressure sensor, and a telescopic support rod; wherein, the oil injection pipe is connected to the hydraulic pump, injecting oil from the oil tank into the oil storage box, the oil in the oil storage box slowly flows into the oil injection plate, and then permeates the foam titanium oil-permeable mold through the oil injection plate, lubricating the inside of the foam titanium oil-permeable mold; the computer controls the telescopic support rod to adjust the confining pressure, and then through the hydraulic cylinder connected to the oil injection pipe... The cylinder extends to press down the pressure rod; after pressing and forming, the pressure at the top is first released, then the rotating base is rotated 90°, and pressure is applied to the top to remove the briquette sample; the briquette sample enters the grinding chamber under the shock absorption of the spring, and the briquette sample to be ground is fixed by tightening the fixing rod, and then the computer transmits a signal to the grinding slider; the grinding slider moves towards the center according to the required size requirements, grinding the wall surface of the briquette sample at different rates; the pressure control device is controlled by a computer, and the signal transmitter contains three signal transmitter disks, each with a signal control light to display the operating status of the telescopic support rod, the grinding slider and the hydraulic pump. The signal transmitter also contains a terminal block, from which a signal receiving line is led out. The end of the signal receiving line is connected to a pressure sensor to transmit the pressure signal to the computer for real-time monitoring of the surrounding pressure and top pressure when pressing the briquette sample.

[0011] Furthermore, the oil storage box is located above the oil injection plate and is made of transparent material; the oil injection plate has multiple oil injection plugs for insertion into the oil injection holes on the foam titanium oil seepage mold; each of the oil injection plugs is connected to the oil storage box and can slowly inject oil into the mold.

[0012] Furthermore, the foam titanium oil seepage mold is formed by pressing two layers of materials: the inner layer is foam titanium material with gaps larger than oil molecules, and the outer layer is a hard steel plate. The foam titanium and the hard steel plate are in complete contact. The inner corners of the foam titanium oil seepage mold are designed as smooth curved surfaces to reduce stress concentration at the corners of the cubic coal briquette sample during the pressing process and eliminate the phenomenon of corner breakage of the obtained coal briquette sample.

[0013] Furthermore, the strain gauge of the pressure sensor is attached to the middle position of the foam titanium oil seepage mold connected to the telescopic support rod. The movement of the telescopic support rod causes the strain gauge to be compressed, thereby obtaining the value of the confining pressure.

[0014] Furthermore, the lower part of the grinding chamber is a mesh base, which is used for the coal powder after grinding to leak through the filter screen to the waste collection chassis at the bottom to avoid environmental pollution; the part of the grinding slider that contacts the briquette sample is made of rough material, and the appropriate roughness is selected according to the required smoothness of the briquette sample.

[0015] Furthermore, when unloading coal, the bottom fixed disc pinches the middle pressing groove and pushes it towards the center, then rotates the pressing groove clockwise. Under the action of the internal spring, the external buckle retracts inward, causing the grinding cavity to separate from the bottom fixed disc, and the coal briquette sample can be taken out.

[0016] Furthermore, the signal transmitting disks are named disk one, disk two, and disk three, and each disk has four indicator lights;

[0017] The first panel controls the hydraulic pump. The first panel has four indicator lights, one red at the top and one green at the bottom. Red indicates that the pump is on and green indicates that it is off. The two indicator lights on the left side control the oil tank to add lubricating oil to the oil storage box, and the two indicator lights on the right side control the oil tank to inject oil into the hydraulic cylinder through the oil injection pipe.

[0018] The second control panel controls the retractable support rod. The four indicator lights correspond to the four vertical surfaces. The confining pressure, pressurization rate, and safe fluctuation range are input into the computer. When the pressure sensor senses the pressure, the indicator light turns green. When the pressure sensor senses the pressure and the pressure reaches the safe fluctuation range, the indicator light turns red. At this time, the operator can pause the loading.

[0019] The No. 3 disk controls the telescopic support rod and the grinding slider on the telescopic support rod. The four indicator lights correspond to the four vertical surfaces. After the briquette sample is fixed, the grinding rate, grinding speed increase rate, support rod advance rate, and grinding safety rate range are set in the computer. When the grinding rate and the support rod advance rate increase, the corresponding indicator light is green. When the increase reaches the grinding safety rate range, the indicator light turns red, and the operator can stop the rate increase.

[0020] Furthermore, the junction box has four wiring holes, each of which leads out a signal transmission line. The strain gauge is attached to the end of the signal transmission line to transmit pressure information to the computer.

[0021] A method for manufacturing coal briquette samples using hydraulic grinding integrated molding device, wherein the crushed and screened raw coal is pressed into coal samples and then ground to obtain standardized coal briquette samples.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1) The foam titanium oil-permeable abrasive in this invention continuously permeates oil, keeping the inside of the abrasive smooth and making it easier to remove the briquette sample;

[0024] 2) In this invention, the edges and corners of the coal briquette sample are rounded and then polished to form sharp edges, thus avoiding the problem of edge and corner damage caused by stress concentration during pressing.

[0025] 3) The pressing process of the present invention can be quantitatively controlled by computer, the pressure on each surface is displayed more clearly, and the pressure control makes the pressure increase more stable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the hydraulic grinding integrated molding device for pressing coal briquettes in this invention.

[0027] Figure 2 This is a schematic diagram of the oil injection device.

[0028] Figure 3 This is a schematic diagram of the molding device.

[0029] Figure 4 This is a schematic diagram of the rotating base.

[0030] Figure 5 This is a schematic diagram of the inside of a foam titanium seepage mold.

[0031] Figure 6 This is a schematic diagram of the outer side of a foam titanium seepage mold.

[0032] Figure 7 This is a schematic diagram of the grinding device.

[0033] Figure 8 This is a schematic diagram of a telescopic support rod.

[0034] Figure 9 This is a schematic diagram of the movement of the grinding slider in the grinding device.

[0035] Figure 10 A schematic diagram of the bottom of the grinding device and the bottom fixed disc.

[0036] Figure 11 This is a schematic diagram of a pressure control device.

[0037] The attached figures are labeled as follows:

[0038] Oil injection device 100, oil injection pipe 101, oil injection plate 102, oil injection plug 1021, oil storage box 103;

[0039] Molding device 200, hydraulic pump 201, oil tank 202, foam titanium oil seepage mold 203, oil injection hole 2031, rod connecting device 2032, rotating base 204, hydraulic cylinder 205, pressable rod 206, working platform 207, safety buckle 2071, slide rail 2072, hydraulic press top plate 208, support column 209;

[0040] Grinding device 300, fixing rod 301, grinding cavity 302, mesh base 3021, grinding slider 303, spring 304, waste collection chassis 305, moving groove 306, bottom fixing disc 307, pressing groove 3071, external buckle 3072.

[0041] Pressure control device 400, computer 401, pressure sensor 402, signal transmitter 403, first panel 4031, second panel 4032, third panel 4033, telescopic support rod 404, signal receiver controller 4041.

[0042] Support platform 500. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0044] Figure 1 The diagram shows an integrated hydraulic grinding and forming device for pressing coal briquettes according to the present invention. It can press coal briquettes using a mold and grind them to ensure the briquettes meet testing standards. The device includes: an oil injection device 100, a forming device 200, a grinding device 300, and a pressure control device 400, wherein the forming device 200 and the grinding device 300 are fixed on a support platform 500.

[0045] 1. Oil injection device

[0046] like Figure 2 As shown, the oil injection device 100 includes an oil injection pipe 101, an oil injection plate 102, and an oil storage box 103. The oil injection plate 102 is installed on the outside of the foam titanium oil seepage mold 203, and the oil storage box 103 is located on top of the oil injection plate 102. The top of the oil storage box 103 is connected to the oil injection pipe 101. The oil storage box 103 continuously supplies lubricating oil to the oil injection plate 102, and the oil in the tank has both hydraulic and lubricating functions. The oil storage box 103 is made of pure transparent PET material to allow observation of the amount of lubricating oil stored in the oil storage box 103 and timely replenishment.

[0047] like Figure 2 As shown, the outer ring of the oil injection plate 102 has eight oil injection plugs 1021, which are used to insert into the oil injection holes 2031 on the foam titanium oil seepage mold 203 (e.g., Figure 6As shown), each oil plug 1021 is connected to the oil storage box 103, and can inject the lubricating oil in the oil storage box 103 into the interior of the foam titanium oil seepage mold 203 through the oil injection hole 2031 on the foam titanium oil seepage mold 203. The oil injection hole 2031 fits with the oil plug 1021.

[0048] 2. Molding device

[0049] like Figure 3 As shown, the molding device 200 includes a hydraulic press body, a hydraulic pump 201, an oil tank 202, a foam titanium oil-permeable mold 203, and a rotating base 204. An oil injection pipe 101 connects the hydraulic pump 201 and the oil storage box 103.

[0050] The hydraulic press body includes a hydraulic cylinder 205, a press rod 206, a working platform 207, a top plate 208, and a support column 209. The hydraulic cylinder 205 is located at the top of the hydraulic press body and includes a cylinder barrel, cylinder head, piston, piston rod, sealing device, buffer device, and venting device. Figure 1 (The hydraulic cylinder 205 is a simplified form, and its internal structure is omitted.) The hydraulic cylinder 205 is connected to the oil injection pipe 101. After absorbing oil, it moves the hydraulic press top plate 208 downward. The hydraulic press top plate 208 is used to move downward to press the coal briquette sample. The working platform 207 is used to place the foam titanium oil-permeable mold 203 and coal powder. The working platform 207 is located below the hydraulic cylinder 205, and a rotating base 204 is provided on the working platform 207. Figure 4 As shown, pressing the safety buckle 2071 releases the safety, allowing the rotating base 204 to move to both sides. Pulling the rotating base 204 along the slide rail 2072 to both sides, and rotating it downwards by 90° when it reaches the edge, then applying pressure from above completes the coal removal process. Support columns 209 are positioned at the four corners of the device, passing through the working platform 207 and connecting to the hydraulic cylinder 205 and the hydraulic press top plate 208. These columns support the entire hydraulic press body and secure the entire briquette sample manufacturing device.

[0051] The hydraulic pump 201 has a high-pressure mode and a low-pressure mode. In high-pressure mode, oil is injected into the hydraulic cylinder 205 to press the coal sample. In low-pressure mode, oil is injected into the oil storage box 103. The hydraulic pump 201 is connected to the hydraulic cylinder 205 and the oil storage box 103 in the hydraulic press body via an oil injection pipe 101. The oil tank 202 is connected to the hydraulic pump 201 and stores lubricating oil. The hydraulic pump 201 pumps the lubricating oil from the oil tank 202 to the hydraulic cylinder 205. The piston of the hydraulic cylinder 205 moves downward under the pressure of the lubricating oil, which in turn causes the pressure rod 206 to push the hydraulic press top plate 208 downward. The hydraulic pump 201 can also draw lubricating oil from the hydraulic cylinder 205, causing the piston to move upward, which in turn drives the hydraulic press top plate 208 upward, thus releasing pressure.

[0052] The oil in the oil tank 202 serves both a hydraulic function and a lubricating function for the interior of the titanium foam seepage mold 203. The oil tank 202 is used to provide lubricating oil to the hydraulic cylinder 205 and the oil storage box 103.

[0053] like Figure 5 As shown, the foamed titanium oil-permeating mold 203 is formed by pressing two layers of materials, and consists of four identical parts forming a complete mold. The inner layer is foamed titanium material with gaps larger than oil molecules, and the corners are smoothed; the outer layer is a common mold material such as hard steel plate. The outer dimensions of the foamed titanium and the hard steel plate are the same, and the contact parts fit together completely. The inner corners of the foamed titanium oil-permeating mold 203 are designed as smooth curved surfaces to reduce stress concentration at the corners of the cubic coal briquette sample during the pressing process, and to eliminate the phenomenon of corner breakage of the obtained coal briquette sample. The foamed titanium oil-permeating mold 203 is located on one side of the telescopic support rod 404. The length of the oil injection pipe 101 only extends to the outer layer material, and then the oil is injected through the permeability of the foamed titanium. Figure 6 The rod connecting device 2032 on the medium foam titanium oil seepage mold 203 passes through the hollow part in the middle of the oil injection plate 102 and is connected to the telescopic support rod 404.

[0054] 3. Grinding device

[0055] like Figure 7 As shown, the grinding device 300 includes a fixed rod 301, a grinding cavity 302, a grinding slider 303, a spring 304, a waste collection chassis 305, a moving groove 306, and a bottom fixed disc 307 (see...). Figure 10 ).

[0056] The fixing rod 301 is used to fix the grinding chamber 302 and the briquette sample. The fixing rod 301 consists of a pair of vertical rods and two pairs of horizontal rods. The vertical rods are used to fix the grinding chamber 302, and the horizontal rods are used to fix the briquette sample to be ground. The pair of vertical rods are located at the middle of both ends of the grinding chamber 302, and the two pairs of horizontal rods fix the upper and lower positions of a set of opposite sides of the briquette sample to be ground.

[0057] The grinding chamber 302 is located in the middle of the grinding device. The lower part of the grinding chamber 302 is a mesh base 3021, which is used for the coal powder after grinding to leak through the filter screen to the waste collection chassis 305 at the bottom, so as to avoid environmental pollution. Figure 7As shown. The mesh base 3021 is part of the grinding chamber 302. The mesh base 3021 has a circular notch in the middle for fixing the bottom fixing disc 307. When the pressing groove 3071 is pinched and rotated, the outer buckle 3072 retracts inward, separating from the mesh base 3021, and the briquette sample remains on the bottom fixing disc 307. The spring 304 is located directly below the bottom fixing disc 307, with one end connected to the bottom fixing disc 307 and the other end connected to the waste collection base 305, serving as a buffer and support. When the grinding slider 303 moves, the falling coal powder leaks through the filter screen of the mesh base 3021 into the waste collection base 305, and is cleaned at the end of the process.

[0058] The grinding slider 303 is located in four positions of the grinding cavity 302 and moves up and down via the moving groove 306. Figure 10 As shown, the retractable support rod 404 is welded to the movable groove 306. A slider in the movable groove 306 can drive the connected grinding slider 303 to move up and down. The retractable support rod 404 is as follows... Figure 8 As shown, a signal receiving controller 4041 is located inside the retractable support rod 404, such as... Figure 9 The signal receiving controller 4041 shown has two leads: one connected to the slider to control its up-and-down movement, and the other connected to the telescopic support rod 404 to control its extension and retraction. The mechanical structure that specifically realizes the up-and-down movement of the grinding slider 303 and the extension and retraction of the telescopic support rod 404 can be implemented using existing technology. For example, the moving groove 306 and the grinding slider 303 are engaged by gears. When the wire from the signal receiving controller 4041 is energized to the grinding slider 303, the gears of the grinding slider 303 rotate, initiating its up-and-down movement. After grinding is completed, the telescopic support rod 404 extends towards the center, allowing the grinding slider 303 to continue contact with the surface of the coal sample to be ground.

[0059] The part of the grinding slider 303 that contacts the coal briquette sample is made of rough material, and the appropriate roughness is selected according to the required smoothness of the coal briquette sample.

[0060] like Figure 10 As shown, when unloading coal, the bottom fixing disc 307 pinches the central pressing groove 3071 and pushes it towards the center. Then, rotating the pressing groove 3071 clockwise causes the external latch 3072 to retract inward under the action of the internal spring 304, thus separating the grinding chamber 302 from the bottom fixing disc 307, allowing the briquette sample to be removed. Besides this structure, the bottom fixing disc 307 can also employ other latching structures, as long as they allow the grinding chamber 302 to separate from the bottom fixing disc 307 to remove the briquette sample.

[0061] like Figure 10As shown, the lower part of the grinding chamber 302 is a mesh base 3021, which is used for the coal powder after grinding to leak through the filter screen to the waste collection chassis 305 at the bottom.

[0062] 4. Pressure control device

[0063] like Figure 11 As shown, the pressure control device 400 includes a computer 401, a pressure sensor 402, a signal transmitter 403, and a telescopic support rod 404.

[0064] The computer 401 is used for transmitting and collecting signals for the entire device, and controls the movement of the telescopic support rod 404 by processing signals. The computer 401 maintains a distance of 3 to 5 meters from the main body of the hydraulic press, and plays the role of transmitting and receiving signals.

[0065] The pressure sensor 402 measures the confining pressure on the coal sample when it is pressed by a strain gauge. The strain gauge is attached to the middle of the foam titanium oil seepage mold 203 connected to the telescopic support rod 404. The strain gauge is compressed by the movement of the telescopic support rod 404 to obtain the value of the confining pressure.

[0066] The signal transmitter 403 is located below the computer 401 and is controlled by the computer 401. The signal transmitter 403 consists of a first panel 4031, a second panel 4032, a third panel 4033, and a connection panel 4034, which are evenly arranged in a clockwise order within the signal transmitter 403. It is used to transmit signals and display the current status of the briquette sample preparation device.

[0067] The first panel 4031 controls the hydraulic pump 201. The first panel 4031 has four indicator lights, one red at the top and one green at the bottom. Red indicates that the pump is on and green indicates that it is off. The two indicator lights on the left control the oil tank 202 to add oil to the oil storage box 103, and the two indicator lights on the right control the oil tank 202 to inject oil into the hydraulic cylinder 205 through the oil injection pipe 101.

[0068] The second disk 4032 controls the telescopic support rod 404. The four indicator lights correspond to the four foam titanium oil seepage molds 203. The confining pressure, pressurization rate and safe fluctuation range are input into the computer 401. When the pressure sensor senses the pressure, the indicator light turns green. When the pressure sensor senses the pressure and the indicator light turns red, the operator can pause loading.

[0069] The third disk 4033 controls the retractable support rod 404 and the grinding slider 303 on the retractable support rod 404. Four indicator lights respectively display the working status of the retractable support rod 404 and the grinding slider 303 in four directions of the grinding chamber 302. After the briquette sample is fixed, the grinding rate, grinding speed increase rate, support rod advance rate, and grinding safety rate range are set in the computer 401. When the grinding rate and the support rod advance rate increase, the corresponding indicator light is green. When the increase reaches the grinding safety rate range, the indicator light turns red, at which point the operator can stop the rate increase.

[0070] The junction box 4034 has four wiring holes, and a signal transmission line is led out from each wiring hole. The strain gauge is attached to the end of the signal transmission line. The pressure sensor 402 measures the confining pressure on the coal sample when it is pressed through the strain gauge. The strain gauge is attached to the middle of the foam titanium oil seepage mold 203 component and transmits the pressure information to the computer 401.

[0071] 5. Hydraulic grinding integrated coal sample preparation method

[0072] The hydraulic grinding and molding integrated device is used to press crushed and screened raw coal into coal samples, which are then ground to obtain standardized specimens. The control method of this device specifically includes the following steps:

[0073] Step A: Before pressing the coal briquette sample, first turn on the hydraulic pump 201 and set it to low pressure mode. Once the hydraulic pump 201 starts, inject the lubricating oil from the oil tank 202 into the oil storage box 103. Then turn off the hydraulic pump 201 and wait for a period of time until the inside of the foam titanium seepage mold 203 is lubricated. Then turn on the hydraulic pump 201 to fill the oil storage box 103 and then turn off the hydraulic pump 201.

[0074] Step B: After lubricating the coal briquette sample, turn on the computer 401 and control the retractable support rod 404 via a signal to close the four foam titanium oil-permeable mold components 203. Add coal powder into the mold until it is full. Input the confining pressure, pressurization rate, and safe fluctuation range into the computer 401, and adjust the hydraulic pump 201 to high-pressure mode. At this time, the indicator light on the second disc 4032 will show green. The hydraulic pump 201 feeds back the oil injection rate to the computer 401. After data processing, the data displayed on the computer 401 is converted into the pressure for pressing the coal briquette sample. When the indicator light on the second disc 4032 shows red, start depressurizing, add coal powder again, and repeat the operation until the required size is reached. Then stop pressurizing and maintain the pressure for a period of time.

[0075] Step C: After the coal briquette sample to be ground is pressed into shape, first release the pressure at the top, then pull the safety buckle of the rotating base 204 along the slide rail 30 to both sides to open the safety bolt, rotate the two rotating bases 204 clockwise 90°, and then apply pressure to the top to unload the coal briquette sample. During this process, the size of the confining pressure can be appropriately reduced.

[0076] Step D: Place the coal briquette sample to be ground into the grinding chamber 302 and tighten the fixing rod 301. After the coal briquette sample is fixed, set the slider grinding rate, grinding speed increase rate, support rod advance rate, and grinding safety rate range in the computer 401. When the grinding rate and the support rod advance rate increase, the corresponding indicator light will turn green. When the increase reaches the grinding safety rate range, the indicator light will turn red, at which point the operator can stop the rate increase.

[0077] Step E: After grinding, when unloading coal, pinch the push groove 3071 in the middle of the bottom fixed disc 307 and push it towards the middle, then rotate the push groove 3071 clockwise. Under the action of the internal spring 304, the external buckle 3072 retracts inward, so that the grinding cavity 302 separates from the bottom fixed disc 307, and the coal briquette sample is taken out.

[0078] The specific embodiments of the present invention disclosed above are intended to help understand the content of the present invention and to implement it accordingly. Those skilled in the art will understand that various substitutions, changes, and modifications are possible without departing from the spirit and scope of the present invention. The present invention should not be limited to the content disclosed in the embodiments of this specification; the scope of protection of the present invention is defined by the claims.

Claims

1. A hydraulically integrated coal briquette sample manufacturing device, characterized in that, Includes an oil injection device, a molding device, a grinding device, and a pressure control device; The oil injection device injects oil into the molding device; The forming device presses coal powder into shape under the control of the pressure control device, and sends the resulting coal briquette sample to the grinding device. The grinding device grinds the coal briquette sample under the control of the pressure control device. The oil injection device includes an oil injection pipe, an oil injection plate, and an oil storage box; The molding device includes a hydraulic press body, a hydraulic pump, an oil tank, a foam titanium oil-permeable mold, and a rotating base; the hydraulic press body includes a hydraulic cylinder, a press rod, a work platform, a hydraulic press top plate, and supporting columns; The grinding device includes a fixed rod, a grinding cavity, a grinding slider, a bottom fixed disc, a spring, and a waste collection chassis; The pressure control device includes a computer, a signal transmitter, a pressure sensor, and a retractable support rod. The oil injection pipe is connected to the hydraulic pump, which injects oil from the oil tank into the oil storage box. The oil in the oil storage box slowly flows into the oil injection plate, and then the oil is injected into the foam titanium oil seepage mold through the oil injection plate to lubricate the inside of the foam titanium oil seepage mold. The computer controls the telescopic support rod to adjust the confining pressure, and then the hydraulic cylinder connected by the oil injection pipe extends the downward pressure rod; after pressing and forming, the pressure at the top is first released, then the rotating base is rotated 90°, and then pressure is applied to the top to unload the briquette sample. The coal briquette sample enters the grinding chamber under the damping action of the spring. The sample is fixed by tightening the fixing rod. Then, the computer transmits a signal to the grinding slider. The grinding slider moves towards the center according to the required size and grinds the coal briquette sample wall at different speeds. The pressure control device is computer-controlled. The signal transmitter includes three signal transmitters, each with a signal control light to display the operating status of the retractable support rod, grinding slider, and hydraulic pump. The signal transmitter also includes a junction box from which a signal receiving line is led out. The end of the signal receiving line is connected to a pressure sensor to transmit the pressure signal to the computer for real-time monitoring of the surrounding pressure and top pressure when pressing the coal briquette sample. The foam titanium oil seepage mold is made of two layers of materials: the inner layer is foam titanium material with gaps larger than oil molecules, and the outer layer is a hard steel plate. The foam titanium and the hard steel plate are in complete contact. The inner corners of the foam titanium oil seepage mold are designed as smooth curved surfaces to reduce stress concentration at the corners of the cubic coal briquette sample during the pressing process and eliminate the phenomenon of corner breakage of the obtained coal briquette sample.

2. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, The oil storage box is located above the oil injection plate and is made of transparent material; the oil injection plate has multiple oil injection plugs for insertion into the oil injection holes on the foam titanium oil seepage mold; each of the oil injection plugs is connected to the oil storage box and can slowly inject oil into the mold.

3. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, The strain gauge of the pressure sensor is attached to the middle of the foam titanium oil seepage mold connected to the telescopic support rod. The strain gauge is compressed by the movement of the telescopic support rod to obtain the confining pressure value.

4. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, The lower part of the grinding chamber is a mesh base, which is used for the coal powder after grinding to leak through the filter screen to the waste collection chassis at the bottom to avoid environmental pollution; the part of the grinding slider that contacts the coal briquette sample is made of rough material, and the appropriate roughness is selected according to the required smoothness of the coal briquette sample.

5. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, When unloading coal, the bottom fixed disc pinches the middle pressing groove and pushes it towards the center. Then, the pressing groove is rotated clockwise. Under the action of the internal spring, the external buckle retracts inward, causing the grinding cavity to separate from the bottom fixed disc and the coal briquette sample to be removed.

6. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, The signal transmitting disks are named disk one, disk two, and disk three, and each disk has four indicator lights; The first panel controls the hydraulic pump. The first panel has four indicator lights, one red at the top and one green at the bottom. Red indicates that the pump is on and green indicates that it is off. The two indicator lights on the left side control the oil tank to add lubricating oil to the oil storage box, and the two indicator lights on the right side control the oil tank to inject oil into the hydraulic cylinder through the oil injection pipe. The second control panel controls the retractable support rod. The four indicator lights correspond to the four vertical surfaces. The confining pressure, pressurization rate, and safe fluctuation range are input into the computer. When the pressure sensor senses the pressure, the indicator light turns green. When the pressure sensor senses the pressure and it reaches the safe fluctuation range, the indicator light turns red. At this time, the operator pauses the loading. The No. 3 disk controls the telescopic support rod and the grinding slider on the telescopic support rod. The four indicator lights correspond to the four vertical surfaces. After the briquette sample is fixed, the grinding rate, grinding speed increase rate, support rod advance rate, and grinding safety rate range are set in the computer. When the grinding rate and the support rod advance rate increase, the corresponding indicator light turns green. When the increase reaches the grinding safety rate range, the indicator light turns red, and the operator stops the rate increase.

7. The integrated hydraulic grinding and briquette sample manufacturing device according to claim 1, characterized in that, The junction box has four wiring holes, and a signal transmission line is led out from each wiring hole. A strain gauge is attached to the end of the signal transmission line to transmit pressure information to the computer.

8. A method for manufacturing coal briquette samples using integrated hydraulic grinding, characterized in that, Using the integrated hydraulic grinding and molding device described in any one of claims 1 to 7, the crushed and screened raw coal is pressed into coal samples and then ground to obtain standardized coal briquettes.

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