Wood chipping machine feeding anti-blocking control system and automatic unblocking method

Abstract

The invention relates to the technical field of wood chippers, and particularly discloses a wood chipper feeding anti-blocking control system and an automatic unblocking method.The wood chipper feeding anti-blocking control system comprises a feeding conveying system, a cutting knife roller and a feeding pressing roller, the included angle a is formed between the upper plate face of a wood conveying belt and the horizontal line, and the included angle a is an acute angle. The automatic blockage clearing method comprises the following steps that S1, if the actual pressure monitored by the pressure-sensitive module meets a set blockage pressure threshold value, blockage is judged; s2, a driving module of the feeding conveying system and a driving module of the feeding compression roller are controlled to stop driving or reversely drive; s3, the telescopic cylinder is controlled to rise, the lifting rod is promoted to jack upwards and reach the highest position, and then the telescopic cylinder is controlled to reset; and S4, a driving module of the feeding conveying system is controlled, and a driving module of the feeding compression roller normally drives feeding. The method has the advantages of reducing the phenomenon of machine jamming, reducing the equipment failure rate and the like.

Description

Technical Field

[0001] The invention relates to the technical field of wood chippers, and in particular to a feed blocking prevention control system and an automatic blocking clearing method for a wood chipper. Background Art

[0002] The wood chipper conveys the wood to the cutting roller area through the feeding conveying system, and then relies on the high-speed rotating cutting roller to cut the wood. The wood chips at the cutting site are screened by the screen. The wood chips smaller than the screen hole size fall down and are discharged. The wood chips larger than the screen hole size are driven by the high-speed airflow and the high-speed rotating cutting roller to rotate more than one circle and cut again, and finally discharged. The main problem in the current industry machinery is that in actual working conditions, the wood feeding is random. For example, now generally use wood clamping machine engineering vehicles to clamp wood and then place it on the feeding conveying system of the wood chipper. The length of each piece of wood is different and the number of wood clamped at a time is different, and the feeding is random. Therefore, once there is too much wood close to the cutting area of ​​the cutting roller in a certain period of time, a common machine jam will occur (that is, the cut wood is filled between the screen and the cutting roller). If the jam is not handled in time, the screen will be broken or the driving components of the cutting roller will be damaged and scrapped. The jamming problem has always been a common problem of various types of chippers. For example, the authorized patent: 202020640846.2, a drum chipper, also describes the jamming problem in the background technology: "After the chipper in the prior art chips, there may be insufficient cutting when discharging...which in turn affects the operation of the machine body and causes the chipper to jam." Another example is the authorized patent: 201620422652.9, a chipper, which also describes the jamming problem in the background technology: "...usually the wood to be cut is often mixed with short, thin, irregular fragments and other hard impurities. If the impurities accumulate for a long time, it is easy to jam the machine equipment and damage the tool, causing the machine to malfunction and affect the service life of the equipment..." Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a wood chipper feed anti-blocking control system and an automatic blockage clearing method, thereby effectively reducing the machine jam phenomenon and lowering the equipment failure rate.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: The feed blocking prevention control system of a wood chipper comprises a feed conveying system, a cutting knife roller and a feed pressing roller. The feed conveying system comprises a wood conveying belt. A screen is arranged on the outer side of the cutting knife roller. The upper plate surface of the wood conveying belt is arranged at an angle ∠a with the horizontal line, and the angle ∠a is an acute angle.

[0005] Optionally, the angle ∠a is 0 to 30 degrees.

[0006] Optionally, the angle ∠a is 15 to 20 degrees.

[0007] Optionally, a first section of screen is arranged directly below the cutting blade roller, and two sides of the first section of screen are supported by a plurality of support blocks respectively, and a pressure-sensitive module is further arranged between the support blocks and the screen.

[0008] Optionally, the driving module of the feed conveying system and the driving module of the feed pressure roller are forward and reverse driving modules.

[0009] Optionally, a control module is further included, wherein a signal input end of the control module is electrically connected to the pressure-sensitive module, and a signal output end of the control module controls a drive module of the feed conveying system and a drive module of the feed pressure roller.

[0010] Optionally, it also includes a lifting rod assembly, which includes a lifting rod bracket, and a plurality of lifting rods are arranged on the lifting rod bracket corresponding to the mesh holes of the screen; a telescopic cylinder is arranged below the upper lifting rod bracket, and the telescopic rod of the telescopic cylinder is combined with the lower part of the upper lifting rod bracket.

[0011] The method for automatically clearing blockage using the wood chipper feed anti-blockage control system as described above comprises the following steps: S1: If the actual pressure monitored by the pressure-sensitive module meets the set blocking pressure threshold, it is determined to be blocked; S2: Control the drive module of the feed conveying system and the drive module of the feed pressure roller to stop driving or reverse driving, and keep driving the cutting roller; S3: When the actual pressure drops to the set low pressure threshold, the telescopic cylinder is controlled to rise, so that the lifting rod is pushed up and reaches the highest position, and then the telescopic cylinder is controlled to reset; S4: Control the driving module of the feed conveying system and the driving module of the feed roller to drive the feed normally.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The use of an inclined upward feeding method is different from the conventional horizontal feeding. In the conventional horizontal feeding, when random high-throughput feeding occurs, when the chips just start to be cut, the cutting roller rotates and cuts the horizontally fed wood. The amount of material cut out tends to increase slowly from a small amount to a slow and continuous amount, and the cut wood gradually becomes longer, and the cycle cutting amount also increases. At this time, the entire gap between the cutting roller and the screen is gradually filled, and then it becomes stuck (serious machine jam), which can only be solved by disassembling the contact blockage fault; and by adopting an inclined upward feeding method, the initial cutting surface of the cutting roller and the wood fed obliquely upward is wider than the cutting surface of the traditional horizontal feeding, and once random high-throughput feeding is encountered, the amount of material cut out can instantly reach a high value. At this time, the amount of material mainly fills the area directly below the cutting roller, while other areas are still in a small filling state, which is more conducive to clearing blockages and improving equipment safety performance.

[0013] By timely monitoring the pressure in the area directly below the cutting roller and adopting an inclined feeding method, the other areas of the cutting roller can be kept in a low material filling state. By timely stopping the feeding or reverse returning the material, the material in the area directly below the cutting roller can be quickly and effectively cleared through the continuous rotation of the cutting roller, and the wood chips close to the screen directly below the cutting roller can be pushed up by the lifting rod, so that the wood chips close to the bottom of the screen can be effectively removed to prevent the next blockage, with good clearing and anti-blocking effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0015] Figure 1 is a side cutaway view of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the cutting roller and the feeding pressure roller of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the screen of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the cutting roller of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the lifting rod assembly of the present invention; Figure 6 It is a simulated curve diagram of the volume change of the cutting material amount of the conventional normal cutting, the conventional blocked cutting and the blocked cutting of the present invention; Figure 7 It is a schematic diagram of the external structure of the present invention. DETAILED DESCRIPTION

[0016] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] like Figures 1 to 7As shown, the wood chipper feed anti-blocking control system includes a feed conveying system 16, a cutting roller 14 and a feed pressure roller 13. The feed conveying system 16 includes a wood conveyor belt 12. A screen is provided on the outer side of the cutting roller 14. Under normal use, the wood chips fall from the screen after being cut, and fall through the collecting trough 15 to the material output system 17 for delivery. In this embodiment, the screen includes a first section of the screen 6 and a second section of the screen 2; then the second section of the screen 2 is directly supported by the support block 3, the lower end of the first section of the screen 6 is limited by the bottom plate 5, and the upper end of the second section of the screen 2 is limited by the clamping plate 10, the first section of the screen 6 and the second section of the screen 2 are inserted into each other, thereby realizing the limitation of the first section of the screen 6 and the second section of the screen 2; the first section of the screen 6 is arranged directly below the cutting roller 14, and the two sides of the first section of the screen 6 are respectively supported by a number of support blocks, for example: in this embodiment, the two sides are supported by an upper support block 3-1, a middle support block 3-2 and a lower support block 3-3, and then a pressure-sensitive module 4 is also arranged between the upper support block 3-1, the middle support block 3-2, the lower support block 3-3 and the first section of the screen 6. The purpose of this design is to monitor the pressure of the first section of the screen 6. When acquiring data, the average value or the highest value of the above-mentioned multiple pressure-sensitive modules 4 can be taken as the basis for judging the blockage; the pressure-sensitive modules selected can be selected but not limited to the common ones such as box sensors, spoke sensors and cantilever beam sensors used in common weighbridges, etc., and their main function is to obtain the squeezing force from the first section of the screen 6. Figure 1 As shown, the upper plate surface of the wood conveyor belt 12 is arranged at an angle ∠a with the horizontal line, and the angle ∠a is an acute angle. The purpose of this design is: different from the conventional horizontal feeding, in the conventional horizontal feeding, when random high-throughput feeding occurs, at the beginning of chip cutting, the cutting knife roller performs rotary cutting on the horizontally fed wood, and the amount of material cut out tends to increase from a small amount to a gradual and continuous slow increase, and the cut wood also gradually becomes longer, and the cycle cutting amount also continues to increase. At this time, the entire gap between the cutting knife roller and the screen is gradually filled, and then jamming (serious jamming) occurs, and the only way to solve the jamming fault is to disassemble the contact, and its simulation curve is as follows Figure 6 In the V2 part, a large amount of feed starts cutting at t0, and then after t2, the entire gap between the cutting roller and the screen is filled to Sx and enters the stuck state, and then the filled volume V2 is as follows Figure 6 As shown; by adopting the inclined upward feeding method of the present invention, the initial cutting surface of the wood material fed by the cutting knife roller and the inclined upward feeding is wider than the cutting surface of the traditional horizontal feeding, and once a random high-throughput feeding is encountered, the amount of material cut can be instantly reached. The material amount is mainly filled in the area 11 directly below the cutting knife roller, while other areas are still in a small amount of filling state, as shown in detail. Figure 6As can be seen from the curve, a large amount of feed begins cutting at t0, and then after t1, the gap between the cutting roller and the screen (mainly directly below the cutting roller) is quickly filled. When the pressure test value reaches the set threshold (it has not yet reached the Sx blocking state), the feed is stopped for clearing. Figure 6 The V3 shown is a comparison curve under normal cutting operation of the conventional technology.

[0020] Optionally, the angle ∠a is 0 to 30 degrees. In this embodiment, ∠a can be preferably 15 to 20 degrees. The significance of limiting the preferred angle is mainly to improve the smoothness of feeding and prevent the wood from being difficult to feed smoothly due to too large an inclination.

[0021] Optionally, the drive module of the feed conveying system and the drive module of the feed pressure roller are reversible drive modules. The purpose of this design is that when performing a blockage clearing operation, the blockage rotated out by the cutting roller 14 can be transported out in the reverse direction as quickly as possible to prevent the blockage from continuing to enter the area 11 directly below the cutting roller.

[0022] Optionally, a control module is further included, wherein a signal input end of the control module is electrically connected to the pressure-sensitive module, and a signal output end of the control module controls the drive module 9 of the feed conveying system and the drive module of the feed pressure roller.

[0023] Optionally, it also includes a lifting rod assembly, the lifting rod assembly includes a lifting rod bracket 8, and the lifting rod bracket 8 is provided with a plurality of lifting rods 8-1 corresponding to the meshes of the screen; a telescopic cylinder 7 is provided below the lifting rod bracket, and the telescopic rod of the telescopic cylinder is combined with the lower part of the lifting rod bracket. In this embodiment, there are two lifting rod assemblies, which are mainly arranged below the first section of the screen 6. Under normal operation, the lifting rod 8-1 drops to the lowest position without affecting the discharge of materials. Then, when clearing the blockage is required, the lifting rod 8-1 is pushed up by the mesh 2-1 of the first section of the screen 6 to lift up the wood chips that are closely attached to the first section of the screen 6. Because the wood chips are staggered and stacked on each other, there is no need to set too many lifting rods 8-1. After the closely attached wood chips are lifted up, they are rotated out by the cutting roller 14 to prevent the next blockage from occurring, and the clearing and anti-blocking effects are good.

[0024] The method for automatically clearing blockage using the wood chipper feed anti-blockage control system as described above comprises the following steps: S1: If the actual pressure monitored by the pressure-sensitive module meets the set blocking pressure threshold, it is determined to be blocked; S2: Control the drive module of the feed conveying system and the drive module of the feed pressure roller to stop driving or reverse driving, and keep driving the cutting roller; S3: When the actual pressure drops to the set low pressure threshold, the telescopic cylinder is controlled to rise, so that the lifting rod is pushed up and reaches the highest position, and then the telescopic cylinder is controlled to reset; S4: Control the driving module of the feed conveying system and the driving module of the feed roller to drive the feed normally.

Claims

1. A wood chipper feed blocking prevention control system, comprising a feed conveying system, a cutting knife roller and a feed pressing roller, wherein the feed conveying system comprises a wood conveying belt, and a screen is arranged on the outer side of the cutting knife roller. Features: The upper plate surface of the wood conveyor belt is arranged at an angle ∠a with the horizontal line, and the angle ∠a is an acute angle.

2. The wood chipper feed blocking prevention control system according to claim 1, Features: The angle ∠a is 0 to 30 degrees.

3. The wood chipper feed blocking prevention control system according to claim 2, Features: The angle ∠a is 15 to 20 degrees.

4. The wood chipper feed blocking prevention control system according to claim 1, Features: A first section of screen is arranged directly below the cutting roller, and two sides of the first section of screen are respectively supported by a plurality of support blocks, and a pressure-sensitive module is also arranged between the support blocks and the screen.

5. The wood chipper feed blocking prevention control system according to claim 1, Features: The driving module of the feed conveying system and the driving module of the feed pressure roller are forward and reverse driving modules.

6. The wood chipper feed blocking prevention control system according to claim 4, Features: It also includes a control module, a signal input end of the control module is electrically connected to the pressure-sensitive module, and a signal output end of the control module controls a drive module of the feed conveying system and a drive module of the feed pressure roller.

7. The wood chipper feed blocking prevention control system according to claim 1, Features: It also includes a lifting rod assembly, which includes a lifting rod bracket, on which a plurality of lifting rods are arranged corresponding to the meshes of the screen; a telescopic cylinder is arranged below the lifting rod bracket, and the telescopic rod of the telescopic cylinder is combined with the lower part of the lifting rod bracket.

8. An automatic blockage clearing method using the wood chipper feed blockage prevention control system as claimed in any one of claims 1 to 7, It is characterized in that The steps include: S1: If the actual pressure monitored by the pressure-sensitive module meets the set blocking pressure threshold, it is determined to be blocked; S2: Control the drive module of the feed conveying system and the drive module of the feed pressure roller to stop driving or reverse driving, and keep driving the cutting roller; S3: When the actual pressure drops to the set low pressure threshold, the telescopic cylinder is controlled to rise, so that the lifting rod is pushed up and reaches the highest position, and then the telescopic cylinder is controlled to reset; S4: Control the driving module of the feed conveying system and the driving module of the feed roller to drive the feed normally.

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