Material raking machine and urea production system

Abstract

The utility model provides a material raking machine and a urea production system, and relates to the technical field of material raking machines. The material raking machine comprises a walking guide rail, a door frame, a first limiting switch and a first check block, and the door frame is connected to the walking guide rail in a guiding mode; the first limiting switch is connected to the bottom of the door frame; the first check block is arranged on the walking guide rail and matched with the first limiting switch. According to the technical scheme, the scrabbling machine can be stopped in time when running to the material yard terminal, and the scrabbling plate of the scrabbling machine is prevented from scraping the material wall.

Description

Technical Field

[0001] The present disclosure relates to the technical field of scraper machines, and in particular to a scraper machine and a urea production system. Background Art

[0002] A material handling machine is a device used for material handling and processing in industrial production. It is widely used in mines, tunnels, underground engineering, ports and docks, power plants, chemical plants, etc. Its main function is to move accumulated materials from one place to another.

[0003] In the large-particle urea production process, the main and auxiliary scraping arms are generally driven back and forth by the gantry to scrape the materials from the pile and drop them onto the transmission belt at the bottom of the pile. The mechanical baffle set on the wall of the pile and the limit switch set on the inner side of the gantry cooperate to send an electrical signal to the controller to stop the scraper.

[0004] However, when operating in the material yard, as the material in the pile becomes less and less, the angle of the scraper arm becomes larger and larger, the scraping load increases, the gantry elastically deforms, and the linear deviation of the track increases. After the scraper arm is subjected to force at a large angle, the span of the gantry increases, and the lateral limit switch cannot effectively contact the mechanical baffle, resulting in contact failure. When the scraper reaches the terminal of the material yard, it cannot be stopped in time, which will cause a major accident in which the scraper plate scrapes the material wall. Utility Model Content

[0005] The purpose of the embodiments of the present disclosure is to provide a scraper and a urea production system, so that the scraper can be stopped in time when it reaches the end of the material yard to prevent the scraper plate from scraping the material wall.

[0006] To solve the above technical problems, the present disclosure provides the following technical solutions:

[0007] A first aspect of the present disclosure provides a scraping machine, comprising:

[0008] Walking rails;

[0009] The gantry, the gantry guide is connected to the walking rail;

[0010] A first limit switch, the first limit switch is connected to the bottom of the door frame;

[0011] The first stopper is arranged on the travel guide rail and cooperates with the first limit switch.

[0012] In some modified embodiments of the first aspect of the present disclosure, the first limit switch includes a switch body and a trigger rod, the first end of the trigger rod is rotatably connected to the switch body, the second end of the trigger rod extends in a vertically downward direction, and the first stop block is arranged in the gap between the walking guide rail and the bottom of the door frame.

[0013] In some modified embodiments of the first aspect of the present disclosure, the top of the first stopper is arc-shaped, and the top of the first stopper can contact the second end of the first limit switch.

[0014] In some modified embodiments of the first aspect of the present disclosure, the gantry includes a support frame and a walking mechanism, the support frame is arranged at the top of the walking mechanism, and the bottom of the walking mechanism is provided with walking wheels, which are guided and connected to the walking guide rails so that a gap is formed between the walking guide rails and the bottom of the walking mechanism.

[0015] In some modified implementations of the first aspect of the present disclosure, the following further comprises:

[0016] A second limit switch is provided on a side wall of the door frame close to the first stopper;

[0017] The second stopper is fixedly connected to the travel guide rail and cooperates with the second limit switch.

[0018] In some modified embodiments of the first aspect of the present disclosure, the second stopper is arranged on a side of the first stopper away from the door frame.

[0019] In some modified embodiments of the first aspect of the present disclosure, the second stopper is detachably connected to the end of the walking guide rail.

[0020] In some modified implementations of the first aspect of the present disclosure, the following further comprises:

[0021] The third stopper is fixedly connected to the end of the walking guide rail, and the third stopper is arranged on a side of the second stopper away from the first stopper.

[0022] In some modified implementations of the first aspect of the present disclosure, the following further comprises:

[0023] The material pile wall encloses the storage space and is set between the two walking guide rails;

[0024] Main grab arm, which is connected to one side of the mast;

[0025] Auxiliary grab arm, one end of the auxiliary grab arm is hinged to the main grab arm, and the other end is connected to the other side of the door frame.

[0026] A urea production system comprises the above-mentioned scraper.

[0027] Compared with the existing technology, the scraper provided by the present invention connects the first limit switch to the bottom of the gantry and sets the first stop block on the walking guide rail. The first stop block cooperates with the first limit switch to enable the scraper to stop in time when it reaches the end of the material yard. This can avoid the problem that the original lateral limit switch cannot effectively contact the mechanical baffle due to the elastic deformation of the gantry, thereby causing the scraper plate to scrape the material wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0029] Figure 1 The structure diagram of a scraping machine is schematically shown;

[0030] Figure 2 The schematic diagram shows a structure of a walking guide rail of a scraping machine;

[0031] Figure 3 The structure diagram of the first stopper of a scraper is schematically shown;

[0032] Figure 4 A partial structural diagram of a scraping machine is schematically shown.

[0033] Description of Figure Numbers:

[0034] 1. Gantry; 11. Support frame; 12. Travel mechanism; 2. Travel rail; 3. First limit switch; 31. Trigger lever; 4. First stop; 5. Second limit switch; 6. Second stop; 7. Third stop; 8. Side wall stop; 9. Pile wall; 10. Material; 13. Lateral limit switch; 14. Reverse switch; 15. Spare reverse switch; 16. Travel wheel. DETAILED DESCRIPTION

[0035] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0036] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0037] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0039] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0040] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0042] A material handling machine is a device used for material handling and processing in industrial production. It is widely used in mines, tunnels, underground engineering, ports and docks, power plants, chemical plants, etc. Its main function is to move accumulated materials from one place to another.

[0043] In the large-particle urea production process, the main and auxiliary grab arms are generally driven back and forth by the gantry to grab the material from the pile and drop it onto the transmission belt at the bottom of the pile. The mechanical baffle set on the wall of the pile 9 and the limit switch set on the inner side of the gantry cooperate to send an electrical signal to the controller to stop the grabber.

[0044] However, when operating in the material yard, as the material in the pile becomes less and less, the angle of the scraper arm becomes larger and larger, the scraping load increases, the gantry elastically deforms, and the linear deviation of the track increases. After the scraper arm is subjected to force at a large angle, the span of the gantry increases, and the lateral limit switch cannot effectively contact the mechanical baffle on the side wall of the material wall, resulting in contact failure. When the scraper reaches the terminal of the material yard, it cannot be stopped in time, which will cause a major accident in which the scraper plate scrapes the material wall.

[0045] In order to solve the above technical problems, the embodiments of the present disclosure provide a scraper and a urea production system, so that the scraper can be stopped in time when it reaches the end of the material yard to prevent the scraper plate from scraping the material wall.

[0046] The purpose of the embodiments of the present disclosure is to provide a scraper and a urea production system, so that the scraper can be stopped in time when it reaches the end of the material yard to prevent the scraper plate from scraping the material wall.

[0047] Example 1

[0048] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a scraper includes a walking guide rail 2, a gantry 1, a first limit switch 3 and a first stopper 4. The gantry 1 is guided and connected to the walking guide rail 2; the first limit switch 3 is connected to the bottom of the gantry 1; the first stopper 4 is arranged on the walking guide rail 2, and the first stopper 4 cooperates with the first limit switch 3.

[0049] The gantry 1 refers to a frame structure consisting of two columns and one or more crossbeams connecting the two columns. The main function of the gantry 1 is to provide a stable support structure for the lifting device to ensure that the load can be safely lifted, lowered or moved. The columns of the gantry 1 are the main parts of the gantry 1 and are responsible for bearing vertical loads. The columns need to have sufficient strength and stability to ensure that they will not bend or deform during operation. The gantry 1 may also include a crossbeam that connects the two columns to increase the overall rigidity of the structure. The gantry 1 also includes a main grab arm and a secondary grab arm, which are respectively connected to the two columns. The main grab arm and the secondary grab arm are hinged so that during movement, the material 10 in the pile is pulled down layer by layer and enters the conveyor belt below the pile. The gantry 1 may also include a guide device, which is connected to the walking guide rail 2 to guide and limit the movement of the gantry 1 to ensure that it moves along the correct path.

[0050] The walking guide rail 2 is a linear motion guide system that provides a fixed track for moving parts, allowing these parts to move smoothly on straight or curved paths. The walking guide rail 2 can be single or multiple, depending on the application requirements and equipment design. For example, four walking guide rails 2 can be set, two pairs, respectively, on both sides of the material pile, and connected to the bottom of the two columns. The guide rail body of the walking guide rail 2 can be made of high-strength steel or aluminum alloy, and the surface is precisely processed to ensure flatness and smoothness and reduce friction. Specifically, the walking guide rail 2 can be connected to the column of the gantry 1 through a guide device such as a slider or roller. The guide device is installed on the moving part of the gantry 1 and contacts the guide rail body, responsible for support and guiding. Balls or rollers can also be installed inside the slider to reduce friction and improve motion accuracy. In order to reduce wear and extend service life, the walking guide rail 2 can be equipped with a lubrication system, which can be manual lubrication or automatic lubrication. The walking guide rail 2 can also be provided with protective devices, such as dust covers, scrapers, etc., to protect the guide rail from pollution such as dust and debris, keep it clean, and increase its service life. The walking guide rail 2 can be a linear guide rail, which is the most common form and is suitable for linear motion occasions. According to the different sliding methods, it can be divided into ball guide rails, roller guide rails and sliding guide rails. Specifically, the walking guide rail 2 can be a ball guide rail, which is equipped with balls inside, has low rolling friction and high operating accuracy, and is suitable for occasions with high precision requirements. The walking guide rail 2 can also be a roller guide rail, which uses rollers instead of balls and has a stronger load-bearing capacity and is suitable for heavy load conditions. The walking guide rail 2 can also be a sliding guide rail, which slides directly with the guide rail through the slider. It has a simple structure and low cost, but has high friction and is suitable for occasions with low precision requirements. The walking guide rail 2 can also be a curved guide rail, which is suitable for occasions where movement along a curved path is required, such as a circular conveyor line, an arc slideway, etc.

[0051] The first limit switch 3 is a position sensor installed at the bottom of the gantry 1. When the gantry 1 contacts the limit switch, the switch is triggered, sending a signal to the control system, causing the gantry to stop. The first limit switch 3 consists of a housing, contacts, and a trigger component. The housing protects the internal components and is typically made of metal or plastic with a certain degree of protection, such as IP67, to adapt to different operating environments. The contacts are the core component of the limit switch, used to detect position changes. The contacts can be either normally open or normally closed. Normally open contacts are open in normal conditions. When the moving part triggers the limit switch, the contacts close, completing the circuit. Normally closed contacts are closed in normal conditions. When the moving part triggers the limit switch, the contacts open, breaking the circuit. The trigger component is the part that contacts the moving part and can be in the form of a straight rod, a swing arm, or other form. The appropriate type is selected based on the specific application. More specifically, the first limit switch 3 also includes a reset mechanism, which automatically returns the contacts to their initial state when the external force is removed after triggering. The first limit switch 3 also includes terminals for connecting to external circuits and transmitting the limit switch signal to the control system.

[0052] The first limit switch 3 can be a mechanical limit switch, triggered by physical contact, featuring a simple structure and high reliability, making it suitable for most industrial environments. Alternatively, the first limit switch 3 can be a photoelectric limit switch, which detects position by interrupting or reflecting a light beam. This non-contact operation makes it suitable for applications requiring wear-free and high-precision detection. Alternatively, the first limit switch 3 can be a proximity switch, which detects the position of metal objects using changes in an electromagnetic field. This non-contact operation makes it suitable for applications involving high-speed motion and high-frequency switching.

[0053] The first stopper 4 is a mechanical device fixed on the guide rail, which is used to limit the maximum stroke of the gantry 1. When the gantry 1 contacts the stopper, the stopper will prevent it from moving forward and trigger the limit switch, sending a signal to the control system to stop the movement. The first stopper 4 can be made of high-strength metal materials (such as steel, aluminum) or wear-resistant engineering plastics to ensure that it has sufficient strength and durability. Depending on the specific application and installation location, the stopper can be designed into different shapes, such as square, round, L-shaped, etc. The first stopper 4 can be installed on the guide rail and its reference surface by bolts, welding or other fixing methods to ensure that it is firm and reliable. In order to improve corrosion resistance and wear resistance, the surface of the stopper can be galvanized, painted or anodized. The stopper can also be equipped with a buffer pad or spring to reduce the impact force and protect the moving parts and guide rails from damage.

[0054] Compared with the prior art, the scraper provided by the present invention connects the first limit switch 3 to the bottom of the gantry 1 and sets the first stop block 4 on the walking guide rail 2. The first stop block 4 cooperates with the first limit switch 3 so that the scraper can stop in time when it reaches the terminal of the material yard, and can avoid the problem that the original lateral limit switch 13 cannot effectively contact the mechanical baffle due to the elastic deformation of the gantry 1, thereby causing the scraper plate to scrape the material wall.

[0055] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, in some modified embodiments of the present disclosure, the first limit switch 3 includes a switch body and a trigger rod 31, the first end of the trigger rod 31 is rotatably connected to the switch body, the second end of the trigger rod 31 extends in a vertically downward direction, and the first stopper 4 is set in the gap between the walking guide rail 2 and the bottom of the gantry 1. On the one hand, after the second end of the trigger rod 31 contacts the stopper, it will rotate and move along the top of the first stopper 4, so that the trigger rod 31 can contact the stopper over a large range, ensuring the stability of the switch triggering. On the other hand, the trigger rod 31 can move along the top of the first stopper 4 and bypass the first stopper 4 without affecting the continued movement of the gantry 1 along the track, that is, the staff can push the gantry 1 to continue moving after the power is cut off, so as to facilitate the maintenance of the gantry 1.

[0056] The switch body is the primary component of the first limit switch 3, containing electrical components such as circuitry and contacts. It is fixedly mounted to the bottom of the mast 1. The trigger rod 31 is a mechanical component that works in conjunction with the switch body and detects the position of the stopper. The first end of the trigger rod 31 is connected to the switch body via a pivoting mechanism, such as a hinge or hinge, allowing it to rotate freely within a certain range. The second end of the trigger rod 31 extends vertically downward, forming a trigger portion that contacts the first stopper 4. The first stopper 4 is positioned in the gap between the running rail 2 and the bottom of the mast 1. This positioning ensures that when the mast 1 reaches its limit position, the stopper effectively blocks further movement. The length of the trigger rod 31 should be appropriate, ensuring effective contact with the stopper while not being too long to affect the proper functioning of other components. The stopper's position should be precisely measured and installed to ensure reliable contact with the second end of the trigger rod 31 when in the limit position. The stopper should be securely fastened to prevent loosening or falling out.

[0057] In some variations of the present disclosure, the top of the first stopper 4 is curved, capable of contacting the second end of the first limit switch 3. The curved top of the first stopper 4 allows the trigger rod 31 to smoothly rotate and move along the top of the stopper upon contact. Specifically, the first stopper 4 may include a base and a top. The base portion of the stopper is used to secure it to the travel guide rail 2. The base can be flat or have mounting holes for securely fastening it to the guide rail using bolts or other fastening methods. Specifically, the base can be rectangular, frustum-shaped, or truncated cone-shaped. The top of the stopper is curved to ensure that the trigger rod 31 can smoothly rotate and move along the top of the stopper upon contact. More specifically, the base portion is rectangular and has sufficient area and thickness to ensure the stability of the stopper. The curved top portion is designed as a semicircular or elliptical surface. The radius of curvature of the curved surface can be optimized based on the length and motion trajectory of the trigger rod 31 to ensure smooth contact and movement of the trigger rod 31. The base size can be determined based on the width of the guide rail and its mounting method. For example, the base width can be slightly smaller than the guide rail width to ensure stability after installation. The radius of curvature of the curved top should be calculated based on the length and motion trajectory of the trigger rod 31. The radius of curvature should be greater than half the length of the trigger rod 31 to ensure smooth contact and movement of the trigger rod 31.

[0058] In some modified embodiments of the present disclosure, the gantry 1 includes a support frame 11 and a traveling mechanism 12. The support frame 11 is disposed on top of the traveling mechanism 12. Traveling wheels 16 are disposed at the bottom of the traveling mechanism 12. The traveling wheels 16 are guided and connected to the traveling guide rails 2 so that a gap is formed between the traveling guide rails 2 and the bottom of the traveling mechanism 12. This arrangement not only improves the mobility of the gantry 1 but also provides space for the first limit switch 3 and the first stopper 4 to cooperate.

[0059] The support frame 11 is the main load-bearing part of the gantry 1, which is used to support and fix the scraping device or other working tools. The support frame 11 can be made of high-strength metal material with sufficient rigidity and stability. The walking mechanism 12 is the moving part of the gantry 1, which is responsible for moving on the walking guide rail 2. The walking mechanism 12 may include walking wheels 16, a driving device and a guiding device, etc., wherein the driving device is connected to the walking wheels 16 to drive the walking wheels 16 to move along the walking guide rail 2. The walking wheels 16 are arranged at the bottom of the walking mechanism 12 and are guided and connected to the walking guide rail 2. The walking wheels 16 are used to support the gantry 1 and move along the walking guide rail 2 to ensure the stability and accuracy of the gantry 1. A plurality of walking wheels 16 can be provided, which are divided into passive wheels or active wheels. The passive wheels are only used for support and guidance, and the active wheels are driven by a motor to realize the autonomous movement of the gantry 1. Since the walking wheel 16 is guided and connected to the walking guide rail 2, a certain gap is formed between the walking guide rail 2 and the bottom of the walking mechanism 12. This gap provides space for the cooperation between the first limit switch 3 and the first stopper 4, ensuring that the trigger rod 31 of the limit switch can effectively contact the stopper and move smoothly.

[0060] When the door frame 1 moves normally along the walking guide rail 2, the walking wheel 16 rolls on the guide rail and the support frame 11 remains stable. The trigger rod 31 of the first limit switch 3 does not contact the first stopper 4, and the limit switch is in an untriggered state.

[0061] When the gantry 1 moves to the extreme position, the running wheel 16 continues to move along the guide rail until the second end of the trigger rod 31 contacts the arc-shaped top of the first stop 4. After contact, the trigger rod 31 will rotate around the rotating shaft at its first end and move smoothly along the arc-shaped top of the first stop 4. This smooth movement allows the trigger rod 31 to contact the stop over a large range, ensuring that the contacts in the switch body change and sending a signal to the control system. After receiving the signal, the control system immediately stops the movement of the gantry 1 and issues an alarm to prevent the gantry 1 from exceeding the safety range. When the equipment is powered off, the staff can manually push the gantry 1. After contacting the first stop 4, the trigger rod 31 can continue to move along the arc-shaped top of the stop and bypass the stop. This design allows the gantry 1 to continue moving in the event of a power outage, facilitating inspection and maintenance.

[0062] In some modified embodiments of the present disclosure, a second limit switch 5 and a second stopper 6 are further included. The second limit switch 5 is arranged on the side wall of the gantry 1 close to the first stopper 4; the second stopper 6 is fixedly connected to the walking guide rail, and the second stopper 6 cooperates with the second limit switch 5. The second limit switch 5 is also a position sensor, which is installed on the side wall of the gantry 1. When the gantry 1 contacts the limit switch, the switch will be triggered and a signal will be sent to the control system to achieve a stop action. The second stopper 6 is also a mechanical device fixed to the guide rail, which is used to limit the maximum stroke of the gantry 1. When the gantry 1 contacts the stopper, the stopper will prevent it from moving forward and trigger the limit switch at the same time, sending a signal to the control system to achieve a stop action. Specifically, the second stopper 6 is higher than the first stopper 4, thereby ensuring that the second stopper 6 can contact the second limit block switch on the side wall. More specifically, the second stopper 6 can be a rectangular block or a bar block.

[0063] The addition of a second limit switch 5 and a second stopper 6 further enhances the safety and reliability of the system. This dual limit protection mechanism ensures that the gantry 1 does not exceed the predetermined safety range during movement, while also providing an additional safeguard. Specifically, the second limit switch 5 is mounted on the sidewall of the gantry 1 near the first stopper 4, meaning that the second limit switch 5 is installed on the sidewall facing the direction of travel of the gantry 1. When the second limit switch 5 contacts the second stopper 6, the second stopper 6 blocks the direction of travel, effectively hard-limiting the gantry 1.

[0064] In some modified embodiments of the present disclosure, the second stop 6 is positioned on the side of the first stop 4 away from the gantry 1. This placement further optimizes the layout of the limit switches and stops, ensuring the safety and reliability of the gantry 1 in multiple directions. This design also ensures that the gantry 1 first contacts the first stop 4 for a normal stop, then contacts the second stop 6, mechanically limiting contact with the sidewall in the direction of travel of the gantry 1. This ensures that the gantry 1 can stop even if all electronic controls fail.

[0065] In some modified embodiments of the present disclosure, the second stopper 6 is removably connected to the travel guide rail 2. Designing the second stopper 6 to be removably connected to the rail can significantly improve the system's maintenance convenience and flexibility. Specifically, the second stopper 6 is fixed to the rail with bolts, providing a secure connection, easy installation and removal, and adaptability to various operating conditions. During installation, the second stopper 6 is placed at a predetermined position on the rail, and bolts are passed through the holes in the stopper and tightened to the rail. During removal, the bolts are loosened with a wrench or screwdriver to remove the second stopper 6. The second stopper 6 can also be fixed to the rail using a quick-release fastener. Installation and removal are quick and convenient, requiring no tools. The quick-release fastener includes a base fixed to the rail and a buckle fixed to the stopper. During installation, align the buckle on the stopper with the base on the rail and press firmly or rotate the buckle until a "click" is heard, indicating that it is fastened. During removal, press or rotate the buckle to release it from the base and remove the second stopper 6. The second stop block 6 is detachably connected to the travel guide rail 2 and can be removed from the travel guide rail 2 during maintenance, thereby making it convenient for the gantry 1 to move along the guide rail to the maintenance area at the end of the travel guide rail 2 for maintenance.

[0066] like Figure 1 and Figure 2 As shown, in some modified embodiments of the present disclosure, a third stopper 7 is further included. The third stopper 7 is fixedly connected to the end of the walking guide rail 2 and is arranged on the side of the second stopper 6 away from the first stopper 4. The second stopper 6 is also a mechanical device fixed to the guide rail and is used to limit the maximum travel of the gantry 1. By adding the third stopper 7, the layout of the limit switch and the stopper is further optimized, ensuring the safety and reliability of the gantry 1 in multiple directions. Specifically, the third stopper 7 is higher than the first stopper 4, thereby ensuring that the third stopper 7 can contact the second limit block switch on the side wall. More specifically, the third stopper 7 can be a rectangular block or a bar block. This design not only improves the flexibility and accuracy of the system, but also provides multiple protections to ensure that the equipment can operate safely under various working conditions, while facilitating the maintenance and inspection of the equipment. The third stopper 7 is fixedly connected to the end of the walking guide rail 2, which allows the gantry 1 to stay in the maintenance area at the end of the walking guide rail 2, preventing the gantry 1 from derailing.

[0067] In some modified embodiments of the present disclosure, a material pile wall 9, a main scraping arm, and a secondary scraping arm are further included. The material pile wall 9 encloses a storage space and is disposed between two travel guide rails 2. The main scraping arm is connected to one side of the gantry 1. One end of the secondary scraping arm is hinged to the main scraping arm, and the other end is connected to the other side of the gantry 1. The main scraping arm and the secondary scraping arm are respectively connected to the two uprights that make up the gantry 1. The main scraping arm and the secondary scraping arm are hinged to each other, and during movement, the material 10 in the material pile is scraped layer by layer onto the conveyor belt below the material pile.

[0068] In some modified embodiments of the present disclosure, the lateral limit switch 13 on the mast 1 is connected to the first and second limit switches 3 and 5 via an interlocking mechanism and the electrical system's emergency stop switch. This emergency stop switch can completely shut down power, requiring an electrical reset to resume the feeder's start and stop functions. The lateral limit switch 13 is coupled with a sidewall stop 8 on the feeder wall 9. All interlocks utilize a two-or-one mode, providing multiple protections. Triggering any one of these contacts triggers the interlock, shutting down the feeder.

[0069] In some modified embodiments of the present disclosure, a reversing switch 14 and a spare reversing switch 15 can also be set on the walking guide rail 2. The reversing switch 14 and the spare guide switch 15 are set on the side of the first block 4 close to the gantry 1. After the gantry 1 contacts the reversing switch 14 and the spare guide switch, the gantry 1 moves backward along the walking guide rail 2.

[0070] Example 2

[0071] A urea production system includes the above-mentioned scraper. The scraper includes a running rail 2, a gantry 1, a first limit switch 3, and a first stopper 4. The gantry 1 is guided and connected to the running rail 2; the first limit switch 3 is connected to the bottom of the gantry 1; the first stopper 4 is set on the running rail 2, and the first stopper 4 cooperates with the first limit switch 3. The scraper also includes a material pile wall 9, a main scraper arm, and a secondary scraper arm. The material pile wall 9 encloses a storage space and is set between two running rails 2; the main scraper arm is connected to one side of the gantry 1; one end of the secondary scraper arm is hinged to the main scraper arm, and the other end is connected to the other side of the gantry 1. The urea production system also includes a conveyor belt, which is set at the bottom of the material pile wall 9 to facilitate the receipt of scraped materials 10.

[0072] Compared with the prior art, the urea production system provided by the present invention connects the first limit switch 3 to the bottom of the gantry 1 and sets the first stop block 4 on the walking guide rail 2. The first stop block 4 cooperates with the first limit switch 3 so that the scraper stops running in time when it reaches the terminal of the material yard, which can avoid the problem that the original lateral limit switch 13 cannot effectively contact the mechanical baffle due to the elastic deformation of the gantry 1, thereby causing the scraper plate to scrape the material wall.

[0073] Compared with the prior art, the scraper provided by the present invention connects the first limit switch 3 to the bottom of the gantry 1 and sets the first stop block 4 on the walking guide rail 2. The first stop block 4 cooperates with the first limit switch 3 so that the scraper can stop in time when it reaches the terminal of the material yard, and can avoid the problem that the original lateral limit switch 13 cannot effectively contact the mechanical baffle due to the elastic deformation of the gantry 1, thereby causing the scraper plate to scrape the material wall.

[0074] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A scraping machine, characterized in that: include: Walking rails; A gantry, wherein the gantry is guide-connected to the walking guide rail; a first limit switch connected to the bottom of the door frame; A first stopper is provided on the travel guide rail, and the first stopper cooperates with the first limit switch.

2. The scraper according to claim 1, characterized in that: The first limit switch includes a switch body and a trigger rod, the first end of the trigger rod is rotatably connected to the switch body, the second end of the trigger rod extends in a vertical downward direction, and the first stop block is arranged in the gap between the walking guide rail and the bottom of the door frame.

3. The scraper according to claim 2, characterized in that: The top of the first stopper is arc-shaped, and the top of the first stopper can contact the second end of the first limit switch.

4. The scraper according to claim 2, characterized in that: The gantry includes a support frame and a walking mechanism, the support frame is arranged on the top of the walking mechanism, and the bottom of the walking mechanism is provided with walking wheels, which are guided and connected to the walking guide rails to form the gap between the walking guide rails and the bottom of the walking mechanism.

5. The scraper according to claim 2, characterized in that: Also includes: a second limit switch, the second limit switch being arranged on a side wall of the door frame close to the first stopper; A second stopper is fixedly connected to the walking guide rail, and the second stopper cooperates with the second limit switch.

6. The scraper according to claim 5, characterized in that: The second stopper is arranged on a side of the first stopper away from the door frame.

7. The scraper according to claim 6, characterized in that: The second stopper is detachably connected to the walking guide rail.

8. The scraper according to claim 6, characterized in that: Also includes: A third stopper is fixedly connected to the end of the walking guide rail, and the third stopper is arranged on a side of the second stopper away from the first stopper.

9. The scraper according to claim 1, characterized in that: Also includes: A material pile wall, the material pile wall enclosing an accommodating space, and the material pile wall is arranged between the two walking guide rails; A main grab arm connected to one side of the door frame; A secondary grabbing arm, one end of which is hinged to the main grabbing arm, and the other end of which is connected to the other side of the door frame.

10. A urea production system, characterized in that: It comprises a scraper as described in any one of claims 1-9.

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