Large-dip-angle belt pressing type conveyor with belt pressing structure for coal mine operation

Abstract

The invention belongs to the technical field of conveyors, and particularly relates to a large-dip-angle belt pressing type conveyor with a belt pressing structure for coal mine operation, which comprises a scattering leakage detection assembly, a data processing assembly and a scattering leakage regulation and control assembly, and is used for generating a scattering regulation and control instruction according to calculation and processing result information of the data processing assembly. A generated instruction is transmitted to the execution assembly, and the execution assembly comprises one or a combination of a deviation rectifying component and a self-lubricating component; according to the method, the scattering and leaking conditions are comprehensively judged by firstly collecting parameters of different parts and different types, and the parameters are used as information input, so that different countermeasures are judged, unnecessary energy waste can be avoided while the scattering and leaking phenomena in the conveying process can be accurately and effectively controlled, and the production cost is reduced. And meanwhile, the influence on the stability of the conveying belt in the conveying process is reduced, so that the conveyor can convey more stably, and the conveying efficiency of the conveyor is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of conveyors, and more specifically, it is a large-angle belt-pressing conveyor for coal mine operations with a belt-pressing structure. Background Art

[0002] There is often a large height difference between working faces in coal mine operations. Therefore, during the transportation process between working faces in coal mines, lifting operations are required. Among existing equipment, conveyors are widely used for transportation. Due to the existence of the height difference, the conveyor belt of the conveyor will have a large inclination angle during operation. A large inclination angle will cause the coal mine to have a tendency to slide under the action of gravity during transportation, which will further cause the rolling and leakage of coal mine particles. When the equipment is operating stably, the rolling and leakage rate of the coal mine during large-angle transportation is relatively low. When the equipment fails and the conveyor belt becomes unstable, the leakage rate will increase to a large extent. Among the many factors affecting the stability of the conveyor belt, the transportation stability of the belt-pressing wheel is one of the most influential factors. Exactly because in a large-angle conveyor, the belt-pressing wheel plays a role in changing the movement trajectory of the conveyor belt, and its belt-pressing position will directly affect the inclination angle of the inclined section of the conveyor belt. The continuous change of the inclination angle will cause the conveyor belt to vibrate. In the prior art, the belt-pressing wheel is usually rotatably installed on the frame of the conveyor through a bearing seat. The main factors causing changes in the conveyor belt angle in this installation method are as follows: First, since coal mine materials are transported, there are more dust and particles, which will cause dust and particles to enter the bearing seat, and then cause the belt-pressing wheel to not rotate normally, resulting in sliding friction between the belt-pressing wheel and the conveyor belt, and then causing the phenomenon of belt vibration. Another factor causing the instability of the belt-pressing wheel is that during the feeding process, the ore materials are unevenly distributed on the conveyor belt and deviate, resulting in the ore materials being padded under the belt-pressing wheel when passing through the conveyor belt. Then, the conveyor belt is squeezed downward when passing through the belt-pressing wheel and rebounds when leaving the belt-pressing wheel, resulting in the vibration of the conveyor belt. Both of the above points will cause an increase in the leakage rate during transportation. Summary of the Invention

[0003] To make up for the deficiencies of the prior art, the present invention proposes a large-angle belt-pressing conveyor for coal mine operations with a belt-pressing structure. The present invention mainly solves the problem of high leakage rate of transported ore materials caused by the fluctuation of the belt-pressing wheel in the existing belt-pressing conveyor.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: a large-angle belt pressing type conveyor for coal mine operations with a belt pressing structure, including a frame body, a driving roller and a driven roller installed on the frame body, a power assembly for driving the driving roller, and a conveyor belt installed on the driving roller and the driven roller for carrying ore; it also includes a belt pressing wheel, a belt pressing wheel symmetrically arranged on the upper part of the lower end of the frame body for pressing the conveyor belt, and the belt pressing wheel is rotationally installed on the frame body through a self-lubricating component; A deviation correction component is arranged on the horizontal section at the lower end of the frame body, and the deviation correction component is used to correct the stacking state of the ore on the conveyor belt that has not entered the inclined section; A spillage detection assembly, including a dynamic detection sensor arranged on the inclined section of the frame body, used to detect the ore spillage data on the inclined section when the conveyor is working, a vibration sensor arranged at the lower end of the upper conveyor belt for detecting the running stability of the conveyor belt, and a pressure sensor arranged on the belt pressing wheel for detecting the pressure data on the belt pressing wheel when the conveyor is working; A data processing component is used to receive the ore spillage-related data collected by the spillage detection assembly (including the data obtained by the dynamic detection sensor, the data detected by the vibration sensor, and the data detected by the pressure sensor), and perform calculation and processing on it; A spillage regulation component is used to generate an instruction for spillage regulation according to the calculation and processing result information of the data processing component, and transmit the generated instruction to the execution component, and the execution component includes one or a combination of two of the deviation correction component or the self-lubricating component.

[0005] Preferably, the self-lubricating component includes an end sleeve, and the end sleeve is fixedly connected to the belt pressing wheel; a transition shaft is rotationally connected inside the end sleeve; clamping holes are evenly spaced along the circumferential direction on the transition shaft; sliding holes are opened along the circumferential direction on the end sleeve, and a positioning pin is slidably connected inside the sliding holes; One end of the transition shaft away from the belt pressing wheel is rotationally connected to a shaft sleeve; an oil injection hole is opened on the shaft sleeve; a guiding hole is opened along the circumferential direction on the shaft sleeve, and a top rod is slidably connected inside the guiding hole; one end of the shaft sleeve away from the transition shaft is slidably connected with a slider; one side of the slider is arranged as an inclined surface; one end of the top rod contacts the inclined surface; a return spring is fixedly connected to the end of the slider away from the transition shaft, and the other end of the return spring abuts against the inner wall of the shaft sleeve; A decorative cylinder is sleeved outside the shaft sleeve; one end of the decorative cylinder is fixedly connected to the shaft sleeve; a through hole is opened on the decorative cylinder, and the through hole is communicated with the oil injection hole through a hose; One end of the top rod away from the guiding hole is provided with a first spring, one end of the first spring is fixedly connected to the top rod, and the other end is fixedly connected to the decorative cylinder; One end of the positioning pin away from the clamping hole is provided with a second spring, one end of the second spring is fixedly connected to the positioning pin, and the other end is fixedly connected to the decorative cylinder; A sliding sleeve is slidably connected to the outside of the decorative cylinder. One end of the inner side of the sliding sleeve is fixedly connected with first magnets at equal intervals along the circumferential direction. The other end of the inner side of the sliding sleeve is fixedly connected with second magnets at equal intervals along the circumferential direction. The ejector rod is made of a magnetic material, and the magnetic poles on the side of the ejector rod opposite to the second magnets are the same; the other end of the bushing is fixedly connected to the frame body through a bracket; Above the sliding sleeve, there is an oil injection assembly for injecting lubricating oil into the oil injection hole.

[0006] Preferably, the oil injection assembly includes a fixed frame fixedly connected to the frame body; an electric push rod is fixedly connected to the lower end of the fixed frame, and the movable end of the electric push rod is fixedly connected with an oil injection gun; One end of the bushing is provided with an inclined portion. The oil injection gun is provided with an oil injection nozzle and a pressing head. The pressing head is connected to the oil injection gun through an elastic member, and the lower end of the pressing head is lower than the lower end of the oil injection nozzle. The pressing head is located above the inclined portion. A limiting spring is provided between the sliding sleeve and the decorative cylinder for resetting the sliding sleeve.

[0007] Preferably, on the opposite side surfaces of the conveyor belt, there are card slots. On the frame body, guide seats are evenly spaced. The guide seats are evenly spaced with grooves, and balls are ball-jointed in the grooves. The upper ends of the balls are in contact with the card slots; the guide seats are of an arc-shaped structure.

[0008] Preferably, the deviation rectifying component includes a mounting plate connected to the fixed frame. Symmetrically below the mounting plate, there are extrusion cylinders. The extrusion rods are slidably connected inside the extrusion cylinders; the lower ends of the extrusion rods are hinged with pressing plates, and stoppers for restricting the rotation angle of the pressing plates are provided at the ends of the extrusion rods; On one side of the frame body near the feeding position, there is a support frame fixedly connected. On the support frame, there is a movable seat slidably connected to the support frame. Balls ball-jointed on the movable seat are in contact with the card slots on the conveyor belt; at the lower part of the support frame, there is a piston cylinder. A piston rod is slidably connected inside the piston cylinder. One end of the piston rod is clamped with a clamping seat at the lower part of the movable seat. An electromagnetic valve is provided on the frame body. The piston cylinder is communicated with an inlet of the electromagnetic valve through a pipeline. The other inlet of the electromagnetic valve is communicated with an external hydraulic device. The outlet of the electromagnetic valve is communicated with the inside of the extrusion cylinder through a pipeline.

[0009] Preferably, a horizontal movement component for driving the pressing plate to move along the movement direction of the conveyor belt is provided between the mounting plate and the fixed frame. On the frame body, a speed measurement component is provided for measuring the conveying speed of the conveyor belt.

[0010] Preferably, the conveyor belt includes a steel wire rope core layer and surface layers coated on both sides of the steel wire rope core layer. On both sides of the steel wire rope core layer along the belt length direction, there are sparse weaving parts, and the rest are dense weaving parts. The number of transverse steel wires in the sparse weaving parts does not exceed 1 / 3 of the number of transverse steel wires in the dense weaving parts.

[0011] Preferably, a hot melt layer is provided between the steel wire core layer and the surface layer of the conveyor belt, and the melting temperature of the hot melt layer is lower than that of the surface layer.

[0012] Preferably, the edge of the pressure plate is in a warped structure, and the material-facing side of the pressure plate is higher than the material-backing side.

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, the deviation correction component is used to correct the deviation of the ore that has not entered the area of the pressure roller, preventing the ore from entering directly below the pressure roller, which may cause the vibration of the conveyor belt and further lead to the spillage of the ore. At the same time, the deviation correction component can control the uniform distribution of the ore on the conveyor belt, preventing the increase in the dropping rate caused by deviation. The self-lubricating component lubricates the rotating connection part between the pressure roller and the frame body to eliminate the stalling caused by dust or particles on the pressure roller, and further prevent the spillage of the ore caused by the vibration of the conveyor belt. By simultaneously controlling the operation of the deviation correction component and the self-lubricating component, the factors that may cause the vibration of the conveyor belt can be eliminated, promoting the stable operation of the conveyor belt and reducing the spillage rate of the ore. When the spillage rate is high, first collect parameters from different parts and of different types to comprehensively judge the spillage situation, and use this as the input of information. Then, different countermeasures can be judged, which can accurately and effectively control the spillage phenomenon during the conveying process, avoid unnecessary waste of energy, and reduce the impact on the stability of the conveyor belt during transportation. Furthermore, the conveyor can operate more stably and improve the transportation efficiency of the conveyor.

[0014] 2. When the present invention is working properly, at this time, the position of the first magnet is far from the positioning pin. At this time, under the action of the second spring, the positioning pin is inserted into the clamping hole on the transition shaft, and the rotation direction between the end shaft and the transition shaft is restricted. At this time, the rotation of the pressure roller is realized by the rotational connection between the transition shaft and the bushing. When the rotation between the transition shaft and the bushing is jammed due to external dust or particles, at this time, the second magnet is moved to a position directly opposite the positioning pin by sliding the sliding sleeve. At this time, the positioning pin will move away from the clamping hole along the sliding hole under the action of the second spring, and finally break away from the restriction of the sliding hole. At this time, the restriction on the rotation direction between the end sleeve and the transition is released, and they will slide relative to each other, still maintaining the rotation state of the pressure roller, thereby maintaining its stability during the movement with the conveyor belt. At this time, it can avoid the vibration of the pressure roller caused by particles during the lubrication process of the connection part of the transition shaft and during the transmission through the gap between the transition shaft and the bushing. Due to the long-term rotational wear between the transition shaft and the bushing, the gap between them will increase, which will lead to the entry of more and larger ore particles. During the lubrication process, oil is injected from one side of the gap to the other side. During the movement of the oil, the particles will be driven. If the rotation between the transition shaft and the bushing is still relied on, vibration will be generated during the lubrication process, thereby maintaining the stability of the conveyor belt; at the same time, it can quickly play a transitional effect during the process of adjusting the rotation jamming problem of the pressure roller, and avoid the problem of high spillage rate caused by the long adjustment time.

[0015] 3. By providing a clamping groove at the bottom of the conveyor belt in the present invention, the bottom position of the conveyor belt can be thickened, thereby having higher wear resistance; at the same time, by setting the existing transmission roller in the arc shape of the guide seat, when the conveyor belt carries ore, the cross-sectional shapes at various places are basically the same. Therefore, while having better support, it can reduce the wear rate of the bottom of the conveyor belt 5, thereby improving the durability of the conveyor belt; by providing rolling balls on the guide seat and contacting the clamping groove at the same time, it can better limit the lateral displacement of the conveyor belt, thereby effectively avoiding the deviation of the conveyor belt, further reducing the deviation of the ore on the conveyor belt, and further reducing the situation of ore spilling caused by ore deviation, and improving the stability of transportation.

[0016] 4. In the present invention, since most conveyor belts with large inclination angles are provided with a belt-pressing wheel when in use, the belt-pressing wheel enables the conveyor belt to present a large inclination angle and can control the edge of the conveyor belt to bend upward to form a tilt at the edge, thereby preventing the mineral materials from being scattered from the edge during transportation. Since the conveyor belt needs to withstand a large force during transportation, a braided layer is often provided inside, which will affect the troughing property of the conveyor belt. Therefore, in the present scheme, a sparsely woven portion is provided near the edge of the steel wire rope core layer of the conveyor belt to reduce the transverse steel wire rope here, thereby reducing the resistance encountered here during bending, thereby ensuring the strength of the conveyor belt while improving the troughing property of the conveyor belt, thereby enabling the edge of the conveyor belt to better maintain a completely upward state when carrying mineral materials, thereby reliably preventing the mineral materials from falling from the edge of the conveyor belt, further reducing the scattering rate of mineral materials during transportation, and improving the stability of transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a first overall structural schematic diagram of the conveyor in the present invention; Figure 2 It is a second overall structural schematic diagram of the conveyor in the present invention; Figure 3 It is a schematic diagram of the installation structure of the medium pressure pulley and the self-lubricating component of the present invention; Figure 4 This is a schematic diagram of the first installation structure of the deviation-correcting component in the present invention; Figure 5 It is a schematic diagram of a second installation structure of the deviation-correcting component in the present invention; Figure 6 It is a schematic diagram of the overall structure of the deviation correction component in the present invention; Figure 7 It is a structural schematic diagram of the pressing plate in the present invention; Figure 8 This is a schematic diagram of the non-working state of the self-lubricating component in the present invention; Figure 9 It is a schematic diagram of the lubrication state of the self-lubricating component in the present invention; Figure 10 It is a schematic diagram of the first internal structure of the self-lubricating component in the present invention; Figure 11 It is a schematic diagram of the exploded structure of the self-lubricating component in the present invention; Figure 12 is a second internal structure schematic diagram of the self-lubricating component in the present invention; Figure 13 It is a schematic diagram of the installation structure of the sliding sleeve and the decorative tube in the present invention; Figure 14 is a cross-sectional view of the conveyor belt in the present invention; Figure 15 is a schematic diagram of the braided structure of the metal rope core layer in the present invention; Figure 16 is a schematic diagram of the internal structure of the conveyor belt in the present invention; In the figure: frame body 1, driving roller 2, driven roller 3, power assembly 4, conveyor belt 5, pressure belt wheel 6, end sleeve 7, transition shaft 8, card hole 9, sliding hole 10, positioning pin 11, shaft sleeve 12, oil injection hole 13, guiding hole 14, slider 15, ejector rod 16, return spring 17, decorative cylinder 18, first spring 19, second spring 20, sliding sleeve 21, first magnet 22, second magnet 23, fixed frame 24, electric push rod 25, oil injection gun 26, oil injection nozzle 27, extrusion head 28, elastic member 29, card slot 30, guiding seat 31, ball 32, mounting plate 33, extrusion cylinder 34, extrusion rod 35, pressing plate 36, stop block 37, support frame 38, movable seat 39, piston cylinder 40, piston rod 41, solenoid valve 42, horizontal movement assembly 43, wire rope core layer 44, surface layer 45, loosely woven part 46, densely woven part 47, hot melt layer 48, warped structure 49, limiting spring 50. Detailed implementation manners

[0019] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0020] Embodiment 1; As Figures 1 to 3 shown, a large inclination angle pressure belt type conveyor for coal mine operation with a pressure belt structure includes a frame body 1, a driving roller 2 and a driven roller 3 installed on the frame body 1, a power assembly 4 for driving the driving roller 2, and a conveyor belt 5 installed on the driving roller 2 and the driven roller 3 for carrying ore; it further includes a pressure belt wheel 6, pressure belt wheels 6 symmetrically arranged on the upper part of the lower end of the frame body 1 for pressing the conveyor belt 5, and the pressure belt wheels 6 are rotatably installed on the frame body 1 through self-lubricating components; A deviation correction component is arranged on the horizontal section at the lower end of the frame body 1, and the deviation correction component is used to correct the stacking state of the ore on the conveyor belt 5 that has not entered the inclined section; The spillage detection component includes a dynamic detection sensor disposed on the inclined section of the frame 1 for detecting the spillage data of the ore on the inclined section during the operation of the conveyor, a vibration sensor disposed at the lower end of the upper conveyor belt 5 for detecting the running stability of the conveyor belt 5, and a pressure sensor disposed on the pressure roller 6 for detecting the pressure data on the pressure roller 6 during the operation of the conveyor (the pressure sensor on the pressure roller here can be a strain type pressure sensor disposed on the surface of the pressure roller shaft. By measuring the resistance change caused by the tiny deformation on the shaft surface, the radial force is deduced and connected through a conductive slip ring during installation, which is a direct application of the existing technology); The data processing component is used to receive the data related to ore spillage collected by the spillage detection component (including the data obtained by the dynamic detection sensor, the data detected by the vibration sensor, and the data detected by the pressure sensor), and perform calculation and processing on it; The spillage regulation component is used to generate an instruction for spillage regulation according to the calculation result information of the data processing component, and transmit the generated instruction to the execution component. The execution component includes one or a combination of two of the deviation correction component or the self-lubricating component.

[0021] Precisely because in a large-angle conveyor, the pressure roller 6 plays a role in changing the movement trajectory of the conveyor belt 5, and its pressure belt position will directly affect the inclination angle of the inclined section of the conveyor belt 5. The continuous change of the inclination angle will cause the conveyor belt 5 to vibrate; in the prior art, the pressure roller 6 is usually rotatably installed on the frame of the conveyor through a bearing seat. The main factors causing the change of the conveyor belt angle by adopting such an installation method are as follows: First, since coal mine materials are transported, there are more dust and particles, which will cause dust and particles to enter the bearing seat, and then cause the pressure roller 6 to not rotate normally, and then cause sliding friction between the pressure roller 6 and the conveyor belt 5, and then cause the phenomenon of belt vibration. Another factor causing the instability of the pressure roller 6 is that during the feeding process, the ore is unevenly distributed on the conveyor belt 5 and skewed, and then the ore is padded under the pressure roller 6 when passing through the conveyor belt 5. Then, the conveyor belt 5 is squeezed downward when passing through the pressure roller 6 and rebounds when leaving the pressure roller 6, which causes the vibration of the conveyor belt 5. The above two points will both increase the spillage rate during the transportation process.

[0022] When transporting ore, the dynamic movement data C1 of the ore in the inclined section (i.e., the rolling quantity of the ore during transportation per unit time), the vibration data information C2 of the conveyor belt 5 in the inclined section (i.e., the vibration amplitude data of the conveyor belt 5 per unit time), and the pressure data C3 detected by the pressure sensor on the pressure roller 6 (i.e., the pressure data on the pressure roller 6 per unit time. The unit time involved in the above C1, C2, and C3 is the ratio of the length of the inclined section to the movement speed of the conveyor belt 5) are respectively obtained through the set spillage detection component; subsequently, the detected temperature data is transmitted to the data processing component. Subsequently, the data processing component compares the detected C2 data with the set vibration amplitude threshold of the conveyor belt 5 to obtain the number of times the vibration amplitude of the conveyor belt 5 exceeds the set value per unit time , and at the same time compare the detected data with the set pressure threshold to obtain the number of times the pressure exceeds the threshold per unit time ; Subsequently, according to Formula 1 ; Calculate the ore spillage correction index number, where a, b, and c are the proportion coefficients of different sensors, and a + b + c = 1, which is set by the user through the user input component according to the actual use environment; Subsequently, transmit the obtained ore spillage correction index number after processing to the spillage control component. The spillage control component is based on Formula 2 where the group , respectively represent the instructions for the first gear, second gear, and third gear of the spillage control; Among them, the instructions corresponding to the first gear and the second gear are one of controlling the operation of the deviation correction component or controlling the operation of the self-lubricating component; Among them, through the operation of the deviation correction component, the ore that has not entered the area of the pressure roller 6 is corrected to prevent the ore from entering directly below the pressure roller 6, causing the conveyor belt to shake, and then resulting in the spillage of the ore. At the same time, through the deviation correction component, the ore can be evenly distributed on the conveyor belt 5 to prevent the increase in the dropping rate caused by deviation; The self-lubricating component lubricates the rotating connection part between the pressure roller 6 and the frame body 1 to eliminate the stalling of the pressure roller 6 caused by dust or particles, and then prevent the spillage of the ore caused by the belt vibration phenomenon of the conveyor belt 5; The instruction corresponding to the third gear is to control the operation of both the deviation correction component and the self-lubricating component simultaneously to eliminate the factors that may cause the conveyor belt 5 to shake, and then promote the stable operation of the conveyor belt 5 to reduce the ore spillage rate; In this solution, parameters of different parts and different types are first collected to comprehensively judge the spillage situation, which is used as the input of information. Different countermeasures are then judged, enabling precise and effective control of the spillage phenomenon during the conveying process, avoiding unnecessary waste of energy, reducing the impact on the stability of the conveyor belt 5 during transportation, and enabling the conveyor to transport more stably and improve the transportation efficiency of the conveyor.

[0023] Meanwhile, in this solution, a feedback system can also be provided, including obtaining a spillage correction index with a correction index less than 3 and the subsequent correction index acquisition components, a calculation component that performs operations on the data information obtained by the acquisition components through the following formula a judgment component that judges the positive and negative of the calculation result, and a display component that displays the judgment result to the user.

[0024] Among them, through the positive and negative results of multiple consecutive groups displayed by the display component for the user, the user can make an intuitive judgment. If the results of multiple times are all negative, it means that the corresponding instruction of the previous gear cannot well solve the problem of ore spillage. Therefore, the user needs to adjust the proportion coefficients a, b, and c of different sensors, so that the deviation correction component and the self-lubricating component can solve the problem of ore dropping more efficiently and accurately.

[0025] Embodiment 2; Based on Embodiment 1, the present application provides another technical solution. As Figures 8 to 11 shown, the self-lubricating component includes an end sleeve 7, and the end sleeve 7 is fixedly connected to the pressure belt wheel 6; a transition shaft 8 is rotatably connected inside the end sleeve 7; clamping holes 9 are evenly spaced along the circumferential direction on the transition shaft 8; sliding holes 10 are formed along the circumferential direction on the end sleeve 7, and a positioning pin 11 is slidably connected inside the sliding holes 10; One end of the transition shaft 8 away from the pressure belt wheel 6 is rotatably connected to a bushing 12; an oil injection hole 13 is formed on the bushing 12; a guiding hole 14 is formed along the circumferential direction on the bushing 12, and a push rod 16 is slidably connected inside the guiding hole 14; one end of the bushing 12 away from the transition shaft 8 is slidably connected to a slider 15; one side of the slider 15 is arranged as an inclined surface; one end of the push rod 16 contacts the inclined surface; one end of the slider 15 away from the transition shaft 8 is fixedly connected to a return spring 17, and the other end of the return spring 17 abuts against the inner wall of the bushing 12; A decorative cylinder 18 is sleeved outside the bushing 12; one end of the decorative cylinder 18 is fixedly connected to the bushing 12; through holes are formed on the decorative cylinder 18, and the through holes are communicated with the oil injection hole 13 through a hose; As Figure 13As shown in the figure, a first spring 19 is provided at one end of the ejector rod 16 away from the guide hole 14. One end of the first spring 19 is fixedly connected to the ejector rod 16, and the other end is fixedly connected to the decorative cylinder 18; A second spring 20 is provided at one end of the positioning pin 11 away from the clamping hole 9. One end of the second spring 20 is fixedly connected to the positioning pin 11, and the other end is fixedly connected to the decorative cylinder 18; A sliding sleeve 21 is slidably connected to the outside of the decorative cylinder 18. One end of the inner side of the sliding sleeve 21 is fixedly connected with a first magnet 22 at equal intervals along the circumferential direction. The other end of the inner side of the sliding sleeve 21 is fixedly connected with a second magnet 23 at equal intervals along the circumferential direction. The ejector rod 16 is made of a magnetic material, and the magnetic poles on the side of the ejector rod 16 opposite to the second magnet 23 are the same; The other end of the shaft sleeve 12 is fixedly connected to the frame body 1 through a bracket; An oil injection assembly for injecting lubricating oil into the oil injection hole 13 is provided above the sliding sleeve 21.

[0026] During operation, when working normally, at this time, the first magnet 22 is away from the positioning pin 11. At this time, under the action of the second spring 20, the positioning pin 11 is inserted into the clamping hole 9 on the transition shaft 8. At this time, the rotation direction between the end shaft and the transition shaft 8 is restricted. Then, the rotation of the pressure roller 6 is realized by the rotational connection between the transition shaft 8 and the shaft sleeve 12. When the rotation between the transition shaft 8 and the shaft sleeve 12 becomes sluggish due to external dust or particles, then by sliding the sliding sleeve 21, the second magnet 23 is moved to a position directly opposite to the positioning pin 11. At this time, the positioning pin 11 will move along the sliding hole 10 away from the clamping hole 9 under the action of the second spring 20, and finally break away from the restriction of the sliding hole 10. Then, the restriction on the rotation direction between the end sleeve 7 and the transition shaft 8 is released, and they will slide relative to each other, still maintaining the rotation state of the pressure roller 6, and thus being able to maintain its stability during the movement with the conveyor belt 5. At this time, it is possible to avoid the vibration of the pressure roller 6 caused by particles during the lubrication process of the connection part of the transition shaft 8 and during the transmission through the gap between the transition shaft 8 and the shaft sleeve 12 (due to long-term rotational wear between the transition shaft 8 and the shaft sleeve 12, the gap between them will increase, and then more and larger ore particles will enter. When lubricating, oil is injected from one side of the gap to the other side, and the particles will be driven during the movement of the oil. If the rotation between the transition shaft 8 and the shaft sleeve 12 is still relied on, vibration will occur during the lubrication process), and thus the stability of the conveyor belt 5 can be maintained; At the same time, it can quickly achieve a transition effect during the process of adjusting the rotation sluggishness problem of the pressure roller 6, and avoid the problem of high spillage rate caused by too long adjustment time; At the position where the first magnet 22 is far away from the positioning pin 11, at this time, the second magnet 23 is located opposite the ejector rod 16. Since the polarities of the close sides of the two are the same, the ejector rod 16 will apply a force to the ejector rod 16 under the action of the second magnet 23, and then make the ejector rod 16 move in the direction of the slider 15, which will make the slider 15 fit the transition shaft 8, avoiding the rapid loss of the applied lubricating oil. When the sliding sleeve 21 moves, the second magnet 23 then moves to a position far away from the ejector rod 16. At this time, under the action of the first spring 19, the ejector rod 16 retracts. At this time, under the action of the return spring 17, the slider 15 moves away from the transition shaft 8. At this time, lubricating oil is injected into the gap between the slider 15 and the transition shaft 8 through the oil injection assembly. The lubricating oil flows out from the gap between the transition shaft 8 and the bushing 12 and takes away dust or particles to achieve lubrication of the connection; Subsequently, through the reset sliding sleeve 21, the first magnet 22 is further away from the positioning pin 11, so that the positioning pin 11 is inserted into the bayonet. Subsequently, the second magnet 23 approaches the position opposite the ejector rod 16. At this time, the ejector rod 16 presses the slider 15, which will generate an extrusion force on the ejector rod 16, and will squeeze the lubricating oil between the slider 15 and the transition shaft 8 into the connection between the transition shaft 8 and the bushing 12 again, further lubricating its connection position, thereby improving the thoroughness of discharging dust and particles at the connection position by lubrication, and thus improving the self-lubricating effect.

[0027] As Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, the oil injection assembly includes a fixed frame 24, and the fixed frame 24 is fixedly connected to the frame body 1; an electric push rod 25 is fixedly connected to the lower end of the fixed frame 24, and an oil injection gun 26 is fixedly connected to the movable end of the electric push rod 25; One end of the bushing 12 is provided with an inclined portion. The oil injection gun 26 is provided with an oil injection nozzle 27 and a pressing head 28. The pressing head 28 is connected to the oil injection gun 26 through an elastic member 29, and the lower end of the pressing head 28 is lower than the lower end of the oil injection nozzle 27. The pressing head 28 is located above the inclined portion. A limiting spring 50 is arranged between the sliding sleeve 21 and the decorative cylinder 18, which is used to reset the sliding sleeve 21 after the pressing head 28 and the oil injection nozzle 27 are withdrawn.

[0028] When lubrication is not required, the sliding sleeve 21 covers and presses the oil injection hole 13 at this time to prevent lubricating oil from leaking and being contaminated. When oil injection is required, the movable end of the electric push rod 25 moves downward, so that the extrusion head 28 presses against the inclined part, and then the inclined part and the sliding sleeve 21 will be pushed to move to one side. Subsequently, the oil injection nozzle 27 will continue to move against the inclined part until the oil injection hole 13 is exposed. Then the oil injection nozzle 27 is connected to the oil injection hole 13, which is convenient for realizing oil injection lubrication. At the same time, in the process, the movement of the first magnet 22 and the second magnet 23 can be realized, and then the rotation position of the transition shaft 8 can be automatically changed, which is convenient for realizing the full automation of the lubrication process and improving the efficiency and effect of lubrication.

[0029] Embodiment 3; On the basis of the embodiment, the present application provides another technical solution, as Figure 3 、 Figure 4 、 Figure 5 and Figure 14 shown, a clamping groove 30 is arranged on one side surface of the conveyor belt 5 opposite to each other, and guide seats 31 are evenly and spacedly arranged on the frame body 1. Grooves are evenly and spacedly opened on the guide seats 31, and balls 32 are ball-jointed in the grooves, and the upper ends of the balls 32 are in contact with the clamping groove 30; the guide seats 31 are arc-shaped structures.

[0030] During operation, since at least 3 support rollers are usually arranged under the existing conveyor belt 5 after carrying ore, the bottom support roller is used for support, and the support rollers on both sides have a shaping effect, so that the cross section of the conveyor belt 5 presents a groove shape. The existing support method usually causes poor contact between the conveyor belt 5 and the bottom roller, and then the conveyor belt 5 will be deformed at the position of the conveyor roller, and the cross section at the position without the conveyor roller is arc-shaped, which will cause friction at the position of the roller, and then cause serious wear of the conveyor belt 5. Therefore, in this solution, by arranging the clamping groove 30 at the bottom of the conveyor belt 5, the bottom position of the conveyor belt 5 can be thickened, and thus it has higher wear resistance; at the same time, by setting the existing driving roller into the arc shape of the guide seat 31, when the conveyor belt 5 carries ore, the cross-sectional shapes at each place are basically the same, which can play a better supporting role and can reduce the wear rate of the bottom of the conveyor belt 5, thereby improving the durability of the conveyor belt 5.

[0031] By arranging the rolling balls 32 on the guide seat 31 and contacting the clamping groove 30 at the same time, the lateral displacement of the conveyor belt 5 can be better restricted, and thus the deviation of the conveyor belt 5 can be effectively avoided, and the deviation of the ore on the conveyor belt 5 can be reduced. Further, the situation of ore spilling caused by ore deviation can be reduced, and the transportation stability can be improved.

[0032] As Figures 5 to 7As shown in the figure, the deviation correction component includes a mounting plate 33, the mounting plate 33 is connected to the fixing frame 24, symmetrically fixed below the mounting plate 33 are extrusion cylinders 34, and a push rod 35 is slidably connected inside the extrusion cylinders 34; the lower end of the push rod 35 is hinged to a pressing plate 36, and a stop block 37 for restricting the rotation angle of the pressing plate 36 is provided at the end of the push rod 35; On one side of the frame body 1 near the feeding position, a support frame 38 is fixedly connected, on the support frame 38 there is a movable seat 39, the movable seat 39 is slidably connected to the support frame 38, and the ball jointed ball 32 on the movable seat 39 contacts the card slot 30 on the conveyor belt 5; a piston cylinder 40 is fixedly connected to the lower part of the support frame 38, a piston rod 41 is slidably connected inside the piston cylinder 40, one end of the piston rod 41 is clamped with the lower clamping seat of the movable seat 39, an electromagnetic valve 42 is provided on the frame body 1, the piston cylinder 40 is communicated with an inlet of the electromagnetic valve 42 through a pipeline, the other inlet of the electromagnetic valve 42 is communicated with an external hydraulic device, and the outlet of the electromagnetic valve 42 is communicated with the inside of the extrusion cylinder 34 through a pipeline.

[0033] As Figure 7 shown in the figure, the edge of the pressing plate 36 has a warped structure 49, and the pressing plate 36 is higher on the material-facing side than on the material-backing side.

[0034] During normal operation, the electromagnetic valve 42 is set to connect the piston cylinder 40 and the extrusion cylinder 34. When the ore on the conveyor belt 5 is placed obliquely, the conveyor belt 5 will shift, which will cause the card slot 30 to drive the ball 32 to move to one side, so as to drive the movable seat 39 to move to one side, squeeze the piston cylinder 40 on this side, and then the medium therein will enter the inside of the extrusion cylinder 34 on this side, and then the push rod 35 therein will move downward to squeeze the ore on this side. At the same time, the pressing plate on the opposite side will move upward to create space, so as to correct the ore on the conveyor belt 5 and keep the conveyor belt 5 stable; When it is necessary to actively correct the position of the ore, the electromagnetic valve 42 is used to cut off the connection between the external hydraulic device of the extrusion cylinder 34 and the piston cylinder 40, and then the push rod 35 is reset by the external hydraulic device, and the pressing plate 36 is pressed downward to gather the ore at the edge of the conveyor belt 5 towards the middle, preventing the ore from being located below the pressure roller 6 when passing through the pressure roller 6, causing the conveyor belt 5 to shake, and then improving the movement stability of the conveyor belt 5, and further reducing the dropping rate of the ore. In this scheme, by switching between two modes, the correction of the deviation and the gathering of the materials on the conveyor belt 5 are realized. Different factors can be solved by one set of facilities, improving the applicability of the device.

[0035] As Figures 6 to 7As shown in the figure, a horizontal movement component 43 for driving the pressure plate 36 to move along the movement direction of the conveyor belt 5 is provided between the mounting plate 33 and the fixing frame 24, and a speed measuring component is provided on the frame body 1 for measuring the conveying speed of the conveyor belt 5.

[0036] During operation, when detecting whether the placement of the ore on the conveyor belt 5 is offset, there is a difference between the detection position and the position for shaping and correcting the ore. Moreover, the speed of the conveyor belt 5 during movement is not absolutely uniform. Affected by production requirements, the operating speed of the conveyor belt 5 will be adjusted. Therefore, when it is detected that there is an offset in the ore, it is difficult to ensure the detection position when using the pressure plate 36 for trimming. Therefore, in this solution, a horizontal movement component 43 is provided on the mounting plate 33, and a speed measuring component is provided on the frame body 1. The movement speed of the conveyor belt 5 is detected by the speed measuring component, and then the horizontal movement component 43 is used for movement to ensure that the position trimmed by the pressure plate 36 is the position where the ore placement is skewed, thereby ensuring the accuracy and thoroughness of the deviation correction, avoiding incorrect deviation correction, improving the stability of the ore on the conveyor belt 5, and thus reducing the spillage rate during transportation.

[0037] During operation, by setting the pressure plate 36 in a form with warped edges, it is possible to avoid the friction of the pressure plate 36 against the conveyor belt 5 during the pressing process, reduce the wear of the conveyor belt 5. At the same time, the warped shape can reduce the clamping at the edge of the conveyor belt 5 and the pressure plate 36, preventing the occurrence of jitter of the conveyor belt 5 and improving the stability during the transportation of the conveyor belt 5. At the same time, by setting the material-facing side of the pressure plate 36 to face the advancing direction of the conveyor belt 5 material, and the back material side is set higher on the other side opposite to the material-facing side, during the pressing process, the ore passing through the pressure plate 36 will be compacted, and at the same time, it can prevent the ore from entering the upper part of the pressure plate 36 and causing spillage.

[0038] Embodiment 4; On the basis of Embodiment 3, the present application provides another technical solution. As Figures 15 to 16 shown, the conveyor belt 5 includes a steel wire rope core layer 44 and surface layers 45 coated on both sides of the steel wire rope core layer 44. Loosely woven parts 46 are provided on both sides of the steel wire rope core layer 44 along the belt length direction, and the remaining parts are densely woven parts 47. The number of transverse steel wires in the loosely woven part 46 does not exceed 1 / 3 of the number of transverse steel wires in the densely woven part 47.

[0039] During operation, since the conveyor belt 5 with a large inclination angle is mostly provided with a belt pressure wheel 6 when in use, the belt pressure wheel 6 enables the conveyor belt 5 to be in a state of a large inclination angle, and at the same time can control the edge of the conveyor belt 5 to bend upward, forming a tilt at the edge, thereby preventing the mineral material from being scattered from the edge during transportation; and since the conveyor belt 5 needs to withstand a large force during transportation, a woven layer is often provided inside, and the woven layer will affect the troughing property of the conveyor belt 5; therefore, in the present scheme, a sparse woven portion 46 is provided at a position close to the edge of the steel wire rope core layer 44 of the conveyor belt 5 to reduce the transverse steel wire rope here, thereby reducing the resistance encountered here during bending, thereby ensuring the strength of the conveyor belt 5 while improving the troughing property of the conveyor belt 5, thereby enabling the conveyor belt 5 to better maintain a completely upward state at the edge when carrying mineral material, thereby reliably preventing the mineral material from falling from the edge of the conveyor belt 5, further reducing the scattering rate of the mineral material during transportation, and improving the stability of transportation.

[0040] like Figure 16 As shown, a hot melt layer 48 is provided between the steel cord core layer 44 and the surface layer 45 of the conveyor belt 5 , and the melting temperature of the hot melt layer 48 is lower than the melting temperature of the surface layer 45 .

[0041] During operation, due to the belt-pressing wheel 6, wear often occurs at the edge during use. At the same time, since the transported mineral materials generally have edges and corners, local damage to the conveyor belt 5 is often easily caused during transportation. Replacing a whole conveyor belt 5 often requires a long downtime and requires manual up and down slopes many times, which is relatively troublesome. If a direct adhesive repair is used, a bulge will be caused on the conveyor belt 5, affecting the transmission stability of the conveyor belt 5. At the same time, since the adhesive does not involve the internal steel wire core layer 44, the reliability after the repair will be reduced. Therefore, in this solution, a hot melt layer 48 is provided between the steel wire core layer 44 and the surface layer 45 of the conveyor belt 5, and the melting temperature of the hot melt layer 48 is controlled, so the following repair method can be used to repair it; S1: adjusting the length of the cutting edge of the tool so that it is consistent with the thickness of the surface layer 45 of the conveyor belt 5, and then using the tool to cut the surface layer 45 at the damaged position to ensure that the cutting mark forms a closed area; S2: heating the conveyor belt 5 at a temperature that melts the hot-melt layer 48 but does not melt the surface layer 45, and then peeling off the damaged surface layer 45 from the edge of the cut, and continuing to heat during the process; S3: After the two side surface layers 45 are removed, the area is repeatedly purged at least 3 times at a temperature 10°C higher than the melting temperature of the hot melt layer 48; S4: Inspect the condition of the wire rope core layer 44 at this location. Subsequently, using an interpolation method, insert the damaged wire rope into the wire rope core layer 44 and anchor it stably. Then, attach a hot melt layer 48 thereto. Subsequently, quickly blow it with the melting temperature of the hot melt layer 48 until the surface melts, and then quickly bond it to the metal rope core layer; S5: Subsequently, again quickly blow it with the melting temperature of the hot melt layer 48 until the outer surface melts, and then attach the surface layer 45 again. Then, use rubber to fill the repair gap and clamp it stably for no less than 5 minutes until the temperature drops to room temperature to complete the local repair.

[0042] By adopting the addition of the hot melt layer 48, it can make the rubber surface layer 45 easier to peel off. At the same time, it can repair the internal wire rope layer to improve the strength after repair, thereby improving the service adaptability of the conveyor belt 5.

[0043] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. These all fall within the protection scope of the present invention.

Claims

1. A high-angle pressed belt conveyor with a pressed belt structure for use in coal mining operations, comprising a frame (1), an active roller (2) and a driven roller (3) mounted on the frame (1), a power assembly (4) for driving the active roller (2), and a conveyor belt (5) mounted on the active roller (2) and the driven roller (3) for carrying ore materials; characterized in that: It also includes a belt pressing wheel (6), the belt pressing wheel (6) for pressing the conveyor belt (5) being symmetrically arranged on the upper part of the lower end of the frame (1), and the belt pressing wheel (6) is rotatably mounted on the frame (1) through a self-lubricating component; A deviation correction component is provided at the horizontal section at the lower end of the frame (1), and the deviation correction component is used to correct the stacking state of the mineral materials on the conveyor belt (5) that have not entered the inclined section; A leakage detection assembly comprises a dynamic detection sensor arranged at the inclined section of the frame (1) for detecting data on mineral material leakage at the inclined section when the conveyor is in operation, a vibration sensor arranged at the lower end of the upper conveyor belt (5) for detecting the running stability of the conveyor belt (5), and a pressure sensor arranged on the belt pressing wheel (6) for detecting pressure data on the belt pressing wheel (6) when the conveyor is in operation; A data processing component is used to receive the mineral material leakage related data collected by the leakage detection component and perform calculation processing on it; The leakage control component is used to generate material spreading control instructions according to the calculation result information of the data processing component, and transmit the generated instructions to the execution component, which includes one or a combination of a correction component or the self-lubricating component.

2. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 1 is characterized in that: The self-lubricating component comprises an end sleeve (7), the end sleeve (7) being fixedly connected to the belt-pressing roller (6); a transition shaft (8) is rotatably connected inside the end sleeve (7); clamping holes (9) are evenly spaced apart in a circumferential direction on the transition shaft (8); a sliding hole (10) is opened in the end sleeve (7) in a circumferential direction, and a positioning pin (11) is slidably connected in the sliding hole (10); The end of the transition shaft (8) away from the belt-pressing roller (6) is rotatably connected to a sleeve (12); an oil filling hole (13) is provided on the sleeve (12); a guide hole (14) is provided on the sleeve (12) along the circumferential direction, and a push rod (16) is slidably connected in the guide hole (14); a slider (15) is slidably connected to the end of the sleeve (12) away from the transition shaft (8); one side of the slider (15) is arranged as an inclined surface; one end of the push rod (16) contacts the inclined surface; the end of the slider (15) away from the transition shaft (8) is fixedly connected to a return spring (17), and the other end of the return spring (17) contacts the inner wall of the sleeve (12); A decorative tube (18) is sleeved on the outer side of the shaft sleeve (12); one end of the decorative tube (18) is fixedly connected to the shaft sleeve (12); a through hole is formed on the decorative tube (18), and the through hole is connected to the oil filling hole (13) via a hose; A No. 1 spring (19) is provided at one end of the push rod (16) away from the guide hole (14); one end of the No. 1 spring (19) is fixedly connected to the push rod (16), and the other end is fixedly connected to the decorative tube (18); A No. 2 spring (20) is provided at one end of the positioning pin (11) away from the clamping hole (9); one end of the No. 2 spring (20) is fixedly connected to the positioning pin (11), and the other end is fixedly connected to the decorative tube (18); The outside of the decorative tube (18) is slidably connected to a sliding sleeve (21); a first magnet (22) is fixedly connected to the inner side of one end of the sliding sleeve (21) at uniform intervals in the circumferential direction; a second magnet (23) is fixedly connected to the inner side of the other end of the sliding sleeve (21) at uniform intervals in the circumferential direction; the push rod (16) is made of magnetic material; the magnetic poles of the push rod (16) and the second magnet (23) on the side opposite to each other are the same; the other end of the shaft sleeve (12) is fixedly connected to the frame (1) via a bracket; An oil injection assembly for injecting lubricating oil into the oil injection hole (13) is provided above the sliding sleeve (21).

3. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 2, characterized in that: The oil injection assembly comprises a fixing frame (24), the fixing frame (24) being fixedly connected to the frame body (1); an electric push rod (25) is fixedly connected to the lower end of the fixing frame (24), and an oil injection gun (26) is fixedly connected to the movable end of the electric push rod (25); An inclined portion is provided at one end of the shaft sleeve (12); an oiling nozzle (27) and an extrusion head (28) are provided on the oiling gun (26); the extrusion head (28) is connected to the oiling gun (26) via an elastic member (29); the lower end of the extrusion head (28) is lower than the lower end of the oiling nozzle (27); and the extrusion head (28) is located above the inclined portion.

4. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 3 is characterized in that: A slot (30) is provided on a side surface opposite to the conveyor belt (5); guide seats (31) are evenly spaced on the frame (1); grooves are evenly spaced on the guide seats (31); balls (32) are connected in the grooves; the upper ends of the balls (32) are in contact with the slot (30); and the guide seats (31) are arc-shaped structures.

5. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 4, characterized in that: The deviation-correcting component comprises a mounting plate (33), the mounting plate (33) being connected to the fixing frame (24), an extrusion cylinder (34) being symmetrically fixedly connected below the mounting plate (33), an extrusion rod (35) being slidably connected inside the extrusion cylinder (34); a pressing plate (36) being hingedly connected at the lower end of the extrusion rod (35), and a stopper (37) for limiting the rotation angle of the pressing plate (36) being provided at the end of the extrusion rod (35); A support frame (38) is fixedly connected to one side of the frame body (1) near the loading position, and a movable seat (39) is provided on the support frame (38), and the movable seat (39) is slidably connected to the support frame (38), and a ball bearing (32) on the movable seat (39) contacts a groove (30) on the conveyor belt (5); a piston cylinder (40) is fixedly connected to the lower part of the support frame (38), and a piston rod (41) is slidably connected inside the piston cylinder (40), and one end of the piston rod (41) is clamped to a clamping seat at the lower part of the movable seat (39); The frame (1) is provided with a solenoid valve (42); the piston cylinder (40) is connected to an inlet of the solenoid valve (42) through a pipeline; the other inlet of the solenoid valve (42) is connected to an external hydraulic device; and the outlet of the solenoid valve (42) is connected to the interior of the extrusion cylinder (34) through a pipeline.

6. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 5, characterized in that: A horizontal moving assembly (43) is provided between the mounting plate (33) and the fixing frame (24) for driving the pressing plate (36) to move along the moving direction of the conveyor belt (5), and a speed measuring assembly is provided on the frame (1) for measuring the conveying speed of the conveyor belt (5).

7. A high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 6, characterized in that: The conveyor belt (5) comprises a steel wire core layer (44) and a surface layer (45) covering both sides of the steel wire core layer (44), sparsely woven portions (46) are provided on both sides of the steel wire core layer (44) along the belt length, and the remaining portion is a densely woven portion (47), and the number of transverse steel wires in the sparsely woven portion (46) does not exceed 1 / 3 of the number of transverse steel wires in the densely woven portion (47).

8. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 7, characterized in that: A hot melt layer (48) is provided between the steel wire core layer (44) and the surface layer (45) of the conveyor belt (5), and the melting temperature of the hot melt layer (48) is lower than the melting temperature of the surface layer (45).

9. The high-angle pressed belt conveyor with a pressed belt structure for coal mine operation according to claim 5, characterized in that: The edge of the pressing plate (36) is in a warped structure (49), and the material-facing side of the pressing plate (36) is higher than the material-receiving side.

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