CN208070879U - A kind of active feeding head device burying scraper plate ship unloaders - Google Patents

Abstract

The utility model is related to a kind of active feeding head devices burying scraper plate ship unloaders, including burying scraper plate lift arm (1), burying scraper active feeding head (2), feeding head floats up and down mechanism (3), feeding head swings closing-folding mechanism (4), feeding head spiral material fetching mechanism (5), scraper plate lift arm (1) both sides are being buried in burying scraper active feeding head (2) setting, by feeding head float up and down mechanism (3) drive burying scraper active feeding head (2) float up and down, closing-folding mechanism (4) is swung by burying scraper active feeding head (2) folding or expansion by feeding head, burying scraper active feeding head (2) is driven to rotate feeding by feeding head spiral material fetching mechanism (5).Compared with prior art, the utility model is particularly suitable for harbour ship-discharging operation, and the feature of environmental protection is good, feeding is efficient, for coastal dock, can avoid surge and cause vessel roll and cause the impact to structure, to avoid damaging.

Description

An active reclaiming head device of a buried scraper ship unloader

technical field

The utility model relates to a bulk cargo ship unloading machine, in particular to a novel active material taking head device of a buried scraper ship unloader.

Background technique

With the development of the national economy, ports and wharves have higher and higher requirements for the environmental protection performance of loading and unloading equipment, and the country pays more attention to the requirements for energy saving and emission reduction. The reclaiming head of the new buried scraper ship unloader makes ship unloading more efficient, lower energy consumption, and a new type of ship unloading equipment that is more environmentally friendly and energy-saving.

The commonly used ship unloading equipment in the port can be divided into intermittent ship unloader and continuous ship unloader. The intermittent ship unloader is mainly bridge-type grab ship unloader, which is characterized by a wide range of ship types and simple maintenance. However, it is not environmentally friendly, high in cost, high in energy consumption, and high in wharf costs; the portal grab ship unloader is low in cost, but low in efficiency and poor in environmental protection, and is basically completely eliminated; the continuous ship unloader can be divided into chain buckets Ship unloaders and buried scraper ship unloaders, the current chain bucket ship unloader is a rotary L-type chain bucket ship unloader, which is characterized by good environmental protection and high efficiency. The disadvantages are high cost, difficult maintenance, and large chain load. The wear is serious, the maintenance cost is high, and there is a big disadvantage that for the coastal wharf, the ship shakes due to the surge and has a great impact on the equipment, which is easy to cause deformation of the reclaiming head and damage to the structure of the equipment; while the other The continuous ship unloader is a buried scraper ship unloader, which is widely used in grain terminals, and is characterized by high loading and unloading efficiency for materials with good fluidity.

The existing buried scraper ship unloader can only unload materials with relatively good fluidity (such as corn, soybeans, rice, etc.). For materials that are easy to harden (such as chemical fertilizers, cement clinker, etc.), the existing buried scraper The ship unloader does not have the active reclaimer of the utility model patent, which greatly affects the popularization and application of the reclaimer ship unloader with buried scrapers.

In the prior art, the buried scraper ship unloader uses multi-section chains to drive the buried scraper to realize continuous reclaiming operation, which can be used to unload bulk cargo ships. The entire buried scraper unloading channel is surrounded by a closed casing. Effectively control dust spillage and meet the environmental protection requirements of ship unloading operations.

The buried scraper ship unloader uses multiple buried scrapers to lift the material. The buried scrapers are connected to the chain, and the chains are connected in series. The chain is driven by the sprocket to realize continuous cycle unloading operations. The reclaiming head installs partitions on the chain at regular intervals, and the chain drives the scraper to form continuous reclaiming. The tensioning device tensions the chain through mechanical screws and nuts.

For materials with poor fluidity (such as chemical fertilizers, cement clinker, etc.), and for materials that are easy to harden, the existing buried scraper ship unloader will greatly reduce the unloading efficiency, and even cannot take materials.

Contents of the invention

The purpose of the utility model is to provide a utility model that not only has high production efficiency, but also has light weight and high structural strength in order to overcome the above-mentioned defects in the prior art. The active reclaiming head device of the buried scraper ship unloader can improve ship unloading efficiency, save energy and reduce environmental pollution.

The purpose of this utility model can be achieved through the following technical proposals: an active retrieving head device for a buried scraper ship unloader, which is characterized in that it includes a buried scraper lifting arm, an active retrieving head of the buried scraper machine, and Head up and down floating mechanism, reclaiming head swinging and folding mechanism, reclaiming head spiral retrieving mechanism, the active retrieving head of the buried scraper machine is set on both sides of the buried scraper lifting arm, and floats up and down with the reclaiming head respectively Mechanism, the reclaiming head swings and folds the mechanism, and the reclaiming head is connected with the spiral retrieving mechanism. The buried scraper machine is driven by the up and down floating mechanism of the reclaiming head to actively float the reclaiming head up and down. The automatic reclaiming head of the machine is folded or unfolded, and the buried scraper machine is driven by the spiral reclaiming mechanism of the reclaiming head to rotate and reclaim the material.

The active reclaiming head of the buried scraper machine includes a left spiral reclaimer and a right spiral reclaimer respectively arranged on both sides of the lifting arm of the buried scraper, and the left spiral reclaimer is installed on the left side On the spiral reclaimer support, the right spiral reclaimer is installed on the right spiral reclaimer support. Continuously feed material to the buried scraper inlet, effectively improving the material retrieving capacity of the buried scraper.

The up and down floating mechanism of the reclaiming head includes a left floating oil cylinder and a right floating oil cylinder. The tops of the two floating oil cylinders are fixed on both sides of the lifting arm of the buried scraper, and the drive shafts at the bottom are connected to the left spiral reclaiming head bracket and the right spiral reclaiming head respectively. Material holder. The lifting of the material taking head adopts the oil cylinder mechanism for lifting, which is a connecting rod mechanism, which can effectively avoid the surge and avoid the damage to the structure by the jacking force.

The left floating oil cylinder and the right floating oil cylinder are both hydraulic cylinder floating lifting devices, which are pulled up by the oil cylinder and lowered by their own weight. Since they are hinge point connection components, the material retrieving head floats above the material. The lifting force can effectively unload the lifting force without causing damage to the structure. Especially suitable for ship unloading operations in seaports.

The reclaiming head swing folding mechanism includes a left swing oil cylinder and a right swing oil cylinder. The tops of the left swing oil cylinder and the right swing oil cylinder are fixed on both sides of the lifting arm of the buried scraper, and the drive shafts at the bottom are respectively connected to the left spiral reclaimer. head bracket and right auger reclaimer head bracket.

The spiral reclaiming mechanism of the reclaiming head includes a motor and a screw drive shaft, and the motor is respectively connected to the left and right spiral reclaiming heads through the screw drive shaft to drive the screw to rotate. The material is fed through the double helix, the swing of the lifting arm of the buried scraper, through the continuous rotation of the screw, the material is continuously pressed into the feeding port of the buried scraper ship unloader, which is simple and reliable, and the feeding device solves the problem of flow The performance is not good, which greatly improves the unloading efficiency of the terminal.

The lifting arm of the buried scraper is also provided with a loosening plow, which effectively realizes that the reclaiming head cuts into the stockpile to achieve the effect of plowing loose materials.

The lifting arm of the buried scraper is provided with a buried scraper, a lifting bin wall and a chain, and the buried scraper is installed on the chain at regular intervals, and the chain drives the buried scraper to form continuous material retrieving. The tensioning device tensions the chain through mechanical screws and nuts. When retrieving materials, the active retrieving head of the buried scraper machine contacts the materials first, breaks the knots of the materials, plows them loose, and feeds them into the feeding port of the lifting arm of the buried scraper, and the buried scraper continuously runs to carry the material into the buried scraper. The lifting bin wall lifts the material through the friction between the materials. The buried scraper and the lifting bin wall are made of high-strength steel and wear-resistant. The chain is forged with alloy steel to drive the buried scraper to lift. The chain does not directly contact the material, effectively avoiding The wear of the chain is reduced, and the life of the chain is greatly improved.

The chain tensioning method of the ship unloader at the reclaiming head is realized by the mechanical screw head, which is simple and reliable, and has a low failure rate.

There are two types of spiral blades of the left spiral reclaimer and the right spiral reclaimer:

The outer diameter of the large-diameter blade is an arc-shaped smooth surface. When the unloading is in the clearing stage, the spiral cylinder can walk on the ground of the cabin to play a role in clearing the warehouse. Thereby greatly reducing the intensity of workers' clearing operations and improving the efficiency of ship unloading.

The smaller diameter is the sawtooth-shaped spiral blade. This sawtooth-shaped blade can solve the problem of material arching and agglomeration, and make the material loose, thereby improving the fluidity of the material and meeting the needs of the buried scraper to lift the material.

The utility model has a scraper double-helix material taking head, which greatly expands the application range of the buried scraper ship unloader. Buried scraper ship unloader adopts hollow scraper to lift materials, which has relatively high requirements on materials. Especially at the feeding end, the fluidity of the material must be good. This can ensure that the reclaiming scraper is always buried in the stockpile for retrieving. At present, buried scrapers are used to directly lift grains and grains with better fluidity. And this new type of plate double-helix reclaimer can increase the fluidity of materials and feed the scraper reclaimer, so that the buried scraper unloading technology can be applied to more types of goods.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model adds a new type of active retrieving head of the buried scraper ship unloader to the buried scraper continuous ship unloader. The reclaimer is installed on the reclaimer ship unloader to realize continuous unloading. Ship machine operation, the new buried scraper ship unloader mainly consists of three major components: 1. Buried scraper lifting arm 2. Active reclaiming head, 3. Lifting and swinging device of reclaiming head, active reclaiming head device: reclaiming The head is used for excavating and retrieving the device, and feeding the buried scraper ship unloader.

2. The installation method of the active reclaiming head is that the reclaiming head is installed on both sides of the vertical lifting arm. The active reclaiming head adopts a paired double helix method of retrieving materials, and the material is continuously pressed into the buried scraper feeding port through the double helix. , the spiral blade plate runs continuously to break loose the hardened material.

3. The active retrieving head device of the new type buried scraper ship unloader, the reclaiming head floats on the material, suitable for seagoing ship unloading operations, simple maintenance, environmental protection, high cost, high energy consumption, and high wharf cost; for coastal areas At the wharf, the ship shakes due to the surge and has a great impact on the equipment, which is easy to cause deformation of the reclaiming head and damage to the structure of the equipment, and the maintenance cost is low.

4. The guiding mode of the chain is different: the spiral reclaiming head of the ship unloader of the utility model is realized by the paired double helical reclaiming heads buried on both sides of the scraper machine. Through this reclaiming method, the To ensure the reclaiming operation of materials with severe hardening, the reclaiming head is installed outside the buried scraper, which effectively improves the reclaiming efficiency of the buried scraper and improves productivity.

5. The retrieving path of the reclaiming head is different: the reclaiming head retrieving method of the specially invented reclaiming head ship unloader is to press the material into the retrieving port of the buried scraper through the rotation of the screw head. For large bulk carriers, this method has high unloading efficiency, energy saving and environmental protection.

6. The tensioning method of the reclaiming head The chain tensioning method of the reclaiming head ship unloader of the utility model is to realize the chain tensioning through a mechanical screw. The mechanical tensioning device is simple and reliable. Even in the cabin, dust will not cause tension Failure, the chain adopts oil-free high-strength chain, with almost zero failure rate, which greatly improves the unloading efficiency of the terminal.

7. The utility model buried scraper ship unloader adopts innovative technology to realize the automatic wave avoidance of the ship unloader, and solves the problem of damage to structures such as rigid buried scrapers by surges. The lifting arm of the buried scraper is avoided by gravity balance. Realized, the balance weight of the buried scraper reclaiming device pulls upwards, and the lowering depends on the downward pulling force of the oil cylinder. Since the force set by the oil cylinder is a specific value, once the jacking force caused by the surge is encountered, the jacking force can be effectively and quickly unloaded. The counterweight will lift the jib up without damaging the structure, which is especially suitable for ship unloading operations in seaports.

8. The requirement of energy saving is achieved by lifting the reclaimer; the reclaimer system of the utility model can be applied to coastal wharves, greatly improving the reclaiming efficiency of buried scraper ship unloaders, and can effectively avoid the impact of surges on the structure , thus avoiding damage to the structure of the ship unloader caused by the surge.

9. The ship unloader with the reclaiming head of the utility model not only has high efficiency and low energy consumption, but the material is basically fully enclosed during the entire conveying process, which can meet higher environmental protection requirements. The most important thing is that it can adapt to a variety of materials, including, Meet the requirements of national sustainable development.

Description of drawings

Figure 1 is the overall layout of the active reclaiming head of the buried scraper ship unloader;

Fig. 2 is the side view of Fig. 1;

Figure 3 is a front view of the active reclaimer;

Figure 4 is a top view of the active reclaimer;

Fig. 5 is a schematic diagram of the folding state of the active reclaiming head;

Fig. 6 is a schematic diagram of the unfolded working state of the active reclaiming head.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1-2, an active retrieving head device of a buried scraper ship unloader includes a buried scraper lifting arm 1, an active reclaiming head 2 of the buried scraper machine, a floating mechanism 3 for the reclaiming head, and a lifting arm 1 for the buried scraper. The material head swings and folds the mechanism 4, the material retrieving head screw reclaiming mechanism 5, the active reclaiming head 2 of the buried scraper machine is arranged on both sides of the buried scraper lifting arm 1, and is respectively connected with the reclaiming head up and down floating mechanism 3 , the reclaiming head swinging and folding mechanism 4, the reclaiming head spiral retrieving mechanism 5 is connected, the buried scraper machine is driven by the reclaiming head up and down floating mechanism 3 to actively float the retrieving head 2 up and down, and the reclaiming head swings and folds the mechanism 4 The active reclaiming head 2 of the buried scraper machine is folded or unfolded, and the active reclaimer 2 of the buried scraper machine is driven to rotate and reclaim materials through the spiral reclaiming mechanism 5 of the reclaimer.

As shown in Figures 3-6, the active reclaimer 2 of the buried scraper machine includes a left spiral reclaimer 21 and a right helical reclaimer 22 respectively arranged on both sides of the buried scraper lifting arm 1. The left spiral reclaimer 21 is installed on the left spiral reclaimer support 23, and the right spiral reclaimer 22 is installed on the right spiral reclaimer support 24. Continuously feed material to the buried scraper inlet, effectively improving the material retrieving capacity of the buried scraper.

The upper and lower floating mechanism 3 of the reclaiming head includes a left floating oil cylinder 31 and a right floating oil cylinder 32. The tops of the two floating oil cylinders are fixed on both sides of the lifting arm 1 of the buried scraper, and the drive shafts at the bottom are respectively connected to the left spiral reclaiming head support 23. And the right side spiral reclaiming head support 24. The lifting of the material taking head adopts the oil cylinder mechanism for lifting, which is a connecting rod mechanism, which can effectively avoid the surge and avoid the damage to the structure by the jacking force.

The left floating oil cylinder 31 and the right floating oil cylinder 32 are both hydraulic cylinder floating lifting devices, which are pulled up by the oil cylinder and lowered by their own weight. Because they are hinge point connection components, the reclaiming head floats above the material. The jacking force can effectively unload the jacking force without causing damage to the structure. Especially suitable for ship unloading operations in seaports.

The reclaiming head swing folding mechanism 4 includes a left swing oil cylinder 41 and a right swing oil cylinder 42, the top of the left swing oil cylinder 41 and the right swing oil cylinder 42 are fixed on both sides of the buried scraper lift arm 1, and the drive shafts at the bottom are respectively Connect the left spiral reclaimer support 23 and the right spiral reclaimer support 24.

The spiral reclaiming mechanism 5 of the reclaiming head includes a motor 51 and a screw drive shaft 52, and the motor 51 is respectively connected to the left side spiral reclaimer 21 and the right side spiral reclaimer 22 through the screw drive shaft 52 to drive them Spiral turns. The material is fed through the double helix, the swing of the lifting arm of the buried scraper, through the continuous rotation of the screw, the material is continuously pressed into the feeding port of the buried scraper ship unloader, which is simple and reliable, and the feeding device solves the problem of flow The performance is not good, which greatly improves the unloading efficiency of the terminal.

The lifting arm 1 of the buried scraper is also provided with a loosening plow 6, which effectively realizes that the reclaiming head cuts into the stockpile to achieve the effect of plowing loose materials. The buried scraper lifting arm 1 is provided with a buried scraper, a lifting chamber wall and a chain, and the buried scraper is installed on the chain at regular intervals, and the buried scraper is driven by the chain to form continuous feeding. The tensioning device tensions the chain through mechanical screws and nuts. When retrieving materials, the active retrieving head 2 of the buried scraper machine contacts the materials first, breaks the knots of the materials, plows them loosely, and feeds them into the feeding port of the lifting arm 1 of the buried scraper, and the buried scraper continuously runs to carry the materials into the buried scraper The lifting chamber wall of the plate lifts the material through the friction between the materials. The buried scraper and the lifting chamber wall are made of high-strength steel and wear-resistant. The chain is made of alloy steel die forging to drive the buried scraper to lift. The chain does not directly contact the material. Effectively avoid the wear of the chain, the life of the chain is greatly improved.

The chain tensioning method of the ship unloader at the reclaiming head is realized by the mechanical screw head, which is simple and reliable, and has a low failure rate.

The working mode of the chain of the ship unloader at the reclaiming head is composed of the driving sprocket, the tensioning sprocket, and the buried scraper. The ship unloader uses multiple buried scrapers to lift the material, and the buried scrapers are connected to the chain. , the chain is driven by the sprocket to realize continuous cycle unloading operation. The reclaiming head installs partitions on the chain at regular intervals, and the chain drives the scraper to form continuous reclaiming. The tensioning device tensions the chain through mechanical screws and nuts. The chain is not in direct contact with the material, thus effectively avoiding the wear of the chain and greatly improving the life of the chain.

In this embodiment, it also includes: the reclaiming method of the new reclaiming head ship unloader is through the screw feeding of the active reclaiming head, the swing movement of the lifting arm of the upper buried scraper, and the movement of the cart. Walk to realize the reclaiming path of the reclaiming head in the cabin. For large bulk carriers, unloading in this way occupies less shoreline of the wharf, can realize operations in adjacent cabins, and has a high utilization rate of the wharf.

In this embodiment, the scraper chain in the lift arm of the buried scraper is installed in the middle of the lift arm, and the pick-up head is in contact with the material, effectively reducing chain wear. The guiding device of the reclaiming head adopts anti-hook type guide wheels, and the guiding track is an arc track, which can effectively guide the movement of the reclaiming head. The take-up head is tensioned by spiral tensioning, the mechanical tensioning method is simple and reliable, and the failure rate is low.

The lifting of the screw reclaiming head of the buried scraper is lifted by the cylinder drive mechanism. The hydraulic lifting mechanism is a floating mechanism, which always floats above the material, which can effectively avoid surges and avoid damage to the structure by the jacking force.

Therefore, the utility model has greater advantages than the existing buried scraper ship unloader.

The new buried scraper ship unloader adopts innovative technology to realize the automatic wave avoidance of the ship unloader, and solves the problem of damage to structures such as rigid buried scrapers by surges. The lifting arm of the buried scraper is avoided by gravity balance. The balance weight of the scraper reclaimer pulls upwards, and the lowering depends on the downward pulling force of the oil cylinder. Since the force set by the oil cylinder is a specific value, once the jacking force caused by the surge is encountered, the jacking force can be effectively and quickly unloaded, and the balance weight will move The jib can be lifted upward without causing damage to the structure, which is especially suitable for ship unloading operations in seaports.

In summary, the utility model is a new type of screw retrieving head device for buried scraper ship unloader, which not only greatly improves the efficiency of buried scraper ship unloader, but also has low energy consumption. The most important thing is that the screw reclaimer can handle The hardened material is broken loose by the joint action of the double-helix pick-up head, and sent to the pick-up port of the buried scraper machine, which solves the problem that the existing buried scraper ship unloader can only unload with good fluidity In addition, the material is basically fully enclosed during the entire transportation process, which can meet higher environmental protection requirements, thereby greatly improving the unloading efficiency, environmental protection and energy saving.

The spiral blades of the left spiral reclaimer 21 and the right spiral reclaimer 22 have two types: the outer diameter of the large-diameter blade is a smooth surface with an arc shape. It can walk on the ground of the cabin and play a role in clearing the warehouse. Thereby greatly reducing the intensity of workers' clearing operations and improving the efficiency of ship unloading.

The smaller diameter is the sawtooth-shaped spiral blade. This sawtooth-shaped blade can solve the problem of material arching and agglomeration, and make the material loose, thereby improving the fluidity of the material and meeting the needs of the buried scraper to lift the material.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions of the present utility model will be obvious to those skilled in the art after reading the above content. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims (9)

1. An active retrieving head device of a buried scraper ship unloader, characterized in that it comprises a buried scraper lifting arm (1), an active retrieving head (2) of the buried scraper machine, and a floating mechanism for the retrieving head up and down ( 3), the reclaiming head swing folding mechanism (4), the reclaiming head spiral reclaiming mechanism (5), the active retrieving head (2) of the buried scraper machine is arranged on the two sides of the buried scraper lifting arm (1) side, and connected with the up and down floating mechanism (3) of the reclaiming head, the swinging and folding mechanism (4) of the reclaiming head, and the screw reclaiming mechanism (5) of the reclaiming head respectively, and are driven by the up and down floating mechanism (3) of the reclaiming head The active retrieving head (2) of the scraper machine floats up and down, and the active reclaiming head (2) of the buried scraper machine is folded or unfolded through the reclaiming head swing and folding mechanism (4), and the reclaiming head screw retrieving mechanism ( 5) Drive the active reclaiming head of the buried scraper machine (2) to rotate and reclaim the material. 2. The active retrieving head device of a buried scraper ship unloader according to claim 1, characterized in that, the active reclaiming head (2) of the buried scraper machine includes a lifting The left spiral reclaimer (21) and the right spiral reclaimer (22) on both sides of the arm (1), the left spiral reclaimer (21) is installed on the left spiral reclaimer bracket (23 ), the right spiral reclaiming head (22) is installed on the right spiral reclaiming head support (24). 3. The active retrieving head device of a buried scraper ship unloader according to claim 2, characterized in that, the up and down floating mechanism (3) of the retrieving head includes a left floating oil cylinder (31) and a right floating cylinder. Oil cylinder (32), two floating oil cylinder tops are fixed on the both sides of buried scraper lift arm (1), and the bottom drive shaft is respectively connected with left side spiral reclaimer support (23) and right side spiral reclaimer support (24). 4. The active retrieving head device of a buried scraper ship unloader according to claim 3, characterized in that, the left floating oil cylinder (31) and the right floating oil cylinder (32) are both hydraulic cylinders for floating and lifting The device is pulled up by the oil cylinder and lowered by its own weight. 5. The active retrieving head device of a buried scraper ship unloader according to claim 2, characterized in that, the reclaiming head swing and fold mechanism (4) includes a left swing oil cylinder (41) and a right The swing oil cylinder (42), the top of the left swing oil cylinder (41) and the right swing oil cylinder (42) are fixed on both sides of the lifting arm (1) of the buried scraper, and the drive shaft at the bottom is respectively connected to the left spiral pick-up head support (23 ) and the right screw reclaimer support (24). 6. The active reclaiming head device of a buried scraper ship unloader according to claim 2, characterized in that, the reclaiming head screw reclaiming mechanism (5) includes a motor (51) and a screw drive shaft (52), the motor (51) is connected to the left side spiral retrieving head (21) and the right side spiral retrieving head (22) respectively through the screw drive shaft (52), to drive its spiral rotation. 7. The active retrieving head device of a buried scraper ship unloader according to claim 1, characterized in that, the lifting arm (1) of the buried scraper is also provided with a plow for loosening materials (6). 8. The active retrieving head device of a buried scraper ship unloader according to claim 1, characterized in that, the buried scraper lifting arm (1) is provided with a buried scraper, a lifting bin wall and Chain, when retrieving materials, the active retrieving head (2) of the buried scraper machine contacts the materials first, breaks the knots of the materials, plows them loosely, and feeds them into the feeding port of the lifting arm (1) of the buried scraper, and the buried scraper continuously The operation carries the material into the lifting bin wall of the buried scraper, and the material is lifted by the friction between the materials, and the chain drives the buried scraper to lift. 9. The active reclaiming head device of a buried scraper ship unloader according to claim 2, characterized in that, the left spiral reclaiming head (21) and the right spiral reclaiming head (22) There are two types of spiral blades: the large-diameter blade has a circular arc-shaped smooth surface, and the small-diameter spiral blade is zigzag.