Semi-closed slurry scraping device

Abstract

The utility model belongs to the technical field of solar cell manufacturing equipment, and particularly relates to a semi-closed slurry scraping device which comprises a slurry tank, a stirring mechanism and a scraper mechanism which are communicated in sequence, and the stirring mechanism comprises a stirring pump, a stirring tank connected with the stirring pump and a branch pipeline connected with a discharge port of the stirring tank. The stirring tank is provided with a feed port and at least one discharge port, the feed port is communicated with the slurry tank through a main pipeline, and the discharge port is communicated with an inner cavity of the scraper mechanism through a branch pipeline; the upper portion of the slurry tank is connected with an air pressure system through an air pipe, the scraper mechanism is further provided with a one-way injection port, and part of slurry entering the scraper mechanism flows back into the stirring tank through the one-way injection port. Through the arrangement of the stirring pump and the one-way injection port, circulating slurry supply is achieved, slurry blockage is avoided, meanwhile, the slurry is stirred through the stirring pump, the components and viscosity of the slurry are uniform, and the printing quality is improved.

Description

A semi-enclosed scraping device Technical Field

[0001] This utility model belongs to the technical field of solar cell manufacturing equipment, specifically a semi-enclosed scraping device. Background Technology

[0002] In the fields of battery manufacturing equipment, semiconductor manufacturing equipment, and automation equipment, precision printing of paste is one of the core technological processes affecting product performance. Especially in the manufacturing of photovoltaic cells and semiconductor devices, paste printing is required to form a uniform functional coating on the substrate surface. Traditional processes largely rely on manual operation for paste coating, resulting in low efficiency, poor consistency, and susceptibility to human error. As the industry's requirements for production precision and automation levels increase, semi-enclosed doctor blade devices are gradually becoming the mainstream technological solution to replace manual labor.

[0003] In existing technologies, a typical semi-enclosed doctor blade device usually consists of a paste storage tank, a doctor blade housing, and a pneumatic drive system. Its working principle is as follows: a constant pressure is applied to the paste storage tank through the pneumatic system, forcing the paste to flow into the doctor blade housing; subsequently, the doctor blade moves along a linear trajectory to uniformly press the paste onto the substrate surface (such as a silicon wafer or thin film). While this approach improves printing efficiency and automation to some extent, significant technical bottlenecks still exist in practical industrial applications.

[0004] First, there is the issue of slurry blockage. Due to structural design flaws, the connecting pipeline between the slurry storage tank and the doctor blade housing is prone to localized blockage during high-pressure transportation due to slurry particle deposition or solidification. This problem not only causes fluctuations in slurry flow but also leads to regional unevenness in the thickness of the printed layer.

[0005] Second, there is the issue of slurry uniformity. Existing equipment lacks a real-time homogenization mechanism for slurry components. Due to long-term static storage in the tank or exposure to temperature fluctuations, the internal components of the slurry are prone to stratification or agglomeration, resulting in uneven viscosity distribution. When unstirred slurry is directly injected into the doctor blade housing, defects such as localized agglomeration and abnormal porosity are likely to occur in the printed layer, directly affecting the conductivity or mechanical strength of the device.

[0006] The aforementioned technical deficiencies have become key obstacles restricting the development of high-precision paste printing technology. There is an urgent need for a semi-enclosed doctor blade device that can achieve stable paste transfer and dynamic homogenization control to meet the urgent needs of new energy, semiconductor and other fields for efficient and highly consistent manufacturing processes. Summary of the Invention

[0007] To address the problems mentioned above, this invention provides a semi-enclosed scraping device. This device applies pressure to the slurry tank via a pneumatic system and uses a stirring pump to agitate the slurry before it is injected into the scraper mechanism. This effectively solves the problems of clogging and slurry uniformity, thereby improving the printing effect.

[0008] The present invention adopts the following technical solution:

[0009] A semi-enclosed slurry scraping device includes a slurry tank, a stirring mechanism, and a scraper mechanism connected in sequence, wherein:

[0010] The mixing mechanism includes a mixing pump, a mixing tank connected to the mixing pump, and a branch pipe connected to the discharge port of the mixing tank. The mixing tank has a feed inlet and at least one discharge port. The feed inlet is connected to the slurry tank through a main pipe, and the discharge port is connected to the internal cavity of the scraper mechanism through a branch pipe.

[0011] Furthermore, the mixing tank is mounted on the scraper mechanism, and the mixing tank has two discharge ports, which are arranged opposite to each other; the scraper mechanism is provided with two slurry injection ports at intervals, and the two discharge ports are respectively connected to the two slurry injection ports through two branch pipes.

[0012] Furthermore, the scraper mechanism is also equipped with a one-way injection port that communicates with the mixing tank. Part of the slurry that enters the scraper mechanism from the slurry injection port flows back into the mixing tank through the one-way injection port.

[0013] Furthermore, a one-way valve is installed inside the one-way injection port.

[0014] Furthermore, the scraper mechanism includes a scraper housing, inside which is provided a slurry circulation chamber extending along its length direction, two slurry injection ports are provided at both ends of the slurry circulation chamber along its length direction, and a one-way injection port is provided between the two slurry injection ports;

[0015] The slurry injection port is connected to the slurry circulation chamber and the branch pipe respectively, and the one-way injection port is connected to the slurry circulation chamber and the mixing tank respectively.

[0016] Furthermore, the scraper mechanism also includes scraper blades symmetrically arranged at acute angles on both sides of the scraper housing, with a strip-shaped discharge gap formed between the bottoms of the two scraper blades, and the discharge gap is located below the slurry circulation chamber.

[0017] Furthermore, locking plugs are provided on both sides of the discharge gap to prevent slurry from overflowing from both ends of the slurry circulation chamber.

[0018] Furthermore, fixing holes are provided on both sides of the scraper housing, and the scraper blade is provided with a strip hole corresponding to the fixing hole. The positioning pin passes through the strip hole and fixes the scraper blade to the scraper housing.

[0019] Furthermore, a scraper pressure plate is provided on the outer side of the scraper blade, and the scraper pressure plate is fixedly connected to the scraper blade by fixing bolts.

[0020] Furthermore, it also includes a buffer chamber, the inlet of which is connected to the outlet of the slurry tank, and the outlet of the buffer chamber is connected to the inlet of the mixing tank through the main pipeline.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] (1) The semi-enclosed scraping device of this utility model includes a slurry tank, a stirring mechanism and a scraper mechanism connected in sequence. The stirring mechanism includes a stirring pump, a stirring tank connected to the stirring pump and a branch pipe connected to the outlet of the stirring tank. The branch pipe is connected to the internal cavity of the scraper mechanism. Before the slurry is injected into the internal cavity of the scraper mechanism, the slurry is stirred by the stirring pump to make the composition and viscosity of the slurry uniform, prevent clogging and improve printing quality.

[0023] (2) After the slurry of the semi-enclosed scraping device of this utility model enters the mixing pump, it enters the two slurry injection ports on the scraper mechanism through two discharge ports. The slurry enters the scraper housing from both sides of the scraper mechanism. After the scraper housing is filled with slurry, the slurry flows back to the mixing pump from the middle position of the scraper housing, thereby realizing the circulation of slurry, avoiding slurry blockage, and effectively preventing the accumulation and drying of slurry in the scraper housing, thereby extending the service life of the scraper mechanism and improving the printing effect.

[0024] (3) The semi-enclosed scraping device of this utility model includes a buffer chamber. The inlet of the buffer chamber is connected to the outlet of the slurry tank. The outlet of the buffer chamber is connected to the inlet of the mixing pump through a flexible pipe. When the slurry in the slurry tank is about to reach the bottom, the pressure alarm will sound. At the same time, the inlet of the buffer chamber will be closed, and pressure will be applied to the buffer chamber so that the slurry in the buffer chamber will enter the mixing pump. At this time, the operator can remove the slurry tank without affecting normal production. After the slurry tank is filled with slurry and installed in place, air pressure will be applied to the slurry tank, and the inlet of the corresponding buffer chamber will be opened. At the same time, the air pressure of the buffer chamber will be closed, and the normal downward conveying of slurry in the slurry tank can be restored. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the overall structure of a semi-enclosed scraping device provided in an embodiment of this application;

[0027] Figure 2 is a structural diagram of the stirring mechanism of a semi-enclosed scraper provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the scraper mechanism of a semi-enclosed scraper device provided in an embodiment of this application;

[0029] Figure 4 is a schematic diagram of the scraper housing provided in an embodiment of this application;

[0030] Figure 5 is a side view of a scraper housing provided in an embodiment of this application;

[0031] Figure 6 is a cross-sectional view of AA in Figure 5;

[0032] Figure 7 is a schematic diagram of slurry flow in a semi-enclosed scraping device provided in an embodiment of this application;

[0033] Wherein: 1-Slurry tank, 2-Agitation mechanism, 21-Agitation pump, 22-Agitation tank, 221-Inlet, 222-Outlet, 23-Branch pipe, 3-Scraper mechanism, 31-Scraper housing, 311-Slurry circulation chamber, 312-Slurry injection port, 313-One-way injection port, 32-Scraper blade, 33-Outlet gap, 34-Locking plug, 35-Scraper pressure plate, 36-Positioning pin, 37-Fixing bolt, 38-Fixing hole, 39-Strip hole, 4-Main pipe, 5-One-way valve, 6-Buffer chamber, 7-Air pipe, 8-Linear module, 9-Slide rail, 10-First lifting cylinder, 11-Second lifting cylinder, 12-Slider. Detailed Implementation

[0034] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] The present invention will now be discussed in detail with reference to Figures 1 to 7 and specific embodiments.

[0036] As shown in Figures 1-7, this utility model provides a semi-enclosed scraping device that can be applied in the fields of solar cell manufacturing, semiconductor manufacturing, and automation equipment. It can effectively avoid the problem of blockage at the connection between the slurry tank 1 and the scraper mechanism 3, as well as the problem of uneven slurry composition and viscosity, thereby improving the printing quality of the product. The semi-enclosed scraping device of this application includes a slurry tank 1, a stirring mechanism 2, and a scraper mechanism 3 connected in sequence. The slurry flows out of the slurry tank 1, passes through the stirring mechanism 2, and enters the scraper mechanism 3. The stirring mechanism 2 includes a stirring pump 21, a stirring tank 22 connected to the stirring pump 21, and a branch pipe 23 connected to the outlet 222 of the stirring tank 22. The stirring tank 22 has an inlet 221 and at least one outlet 222. The inlet 221 is connected to the slurry tank 1 through a main pipe 4, and the outlet 222 is connected to the internal cavity of the scraper mechanism 3 through the branch pipe 23. By setting the stirring mechanism 2, this application uses the stirring pump 21 to stir the slurry before it enters the scraper mechanism 3, making the composition and viscosity of the slurry more uniform, avoiding clogging problems and improving printing quality. It is important to understand that the slurry in the slurry tank 1 first enters the mixing tank 22 before entering the scraper mechanism 3. After the slurry enters the mixing tank 22, the mixing pump 21 mixes the slurry in the mixing tank 22 to make the slurry more uniform before it enters the scraper mechanism 3 through the branch pipe 23.

[0037] In a preferred embodiment, an air pressure system is connected to the top of the paste tank 1 via an air pipe 7. The air pressure system applies a certain pressure to the paste in the paste tank 1, allowing the paste to smoothly enter the internal cavity of the doctor blade mechanism 3, further avoiding clogging and improving the printing effect.

[0038] In some embodiments, referring to Figure 2, the stirring pump 21 is mounted on the scraper mechanism 3. The stirring pump 21 has two discharge ports 222, which are arranged opposite to each other, i.e., located on opposite sides of the mixing tank 22. The scraper mechanism 3 is provided with two slurry injection ports 312 at intervals on its upper side. The two discharge ports 222 are respectively connected to the two slurry injection ports 312 through two branch pipes 23. The scraper mechanism 3 is also provided with a one-way injection port 313 connected to the mixing tank 22. Part of the slurry entering the scraper mechanism 3 from the slurry injection port 312 flows back to the mixing tank 22 through the one-way injection port 313. After being stirred by the stirring pump 21, the slurry entering the mixing tank 22 enters the slurry inlet 6 on both sides of the doctor blade mechanism 3 through two outlets 222 and branch pipes 23, and then enters the doctor blade housing 31. The slurry flows from both sides of the doctor blade housing 31 towards the middle. After the doctor blade housing 31 is filled, the slurry flows back up from the one-way inlet 313 in the middle back into the mixing tank 22, thus realizing the circulation of the slurry in the doctor blade housing 31 (as shown in Figure 7). This effectively solves the problem of slurry blockage and can also effectively prevent the slurry from accumulating and drying in the doctor blade housing 31, thereby extending the service life of the doctor blade mechanism 3 and improving the printing effect.

[0039] In a preferred embodiment, two slurry injection ports 312 are symmetrically arranged on the scraper mechanism 3, and a one-way injection port 313 is located in the middle of the two slurry injection ports 312. By symmetrically arranging the double discharge port and the double injection port, a flow pattern of "feeding from both sides and returning to the middle" is formed, so that the slurry generates a counter-current circulation in the scraper housing 31. The counter-current circulation can increase the circulation speed of the slurry and reduce the residence time of the slurry in the scraper housing 31, thereby effectively eliminating the flow dead zone and avoiding the problem of slurry blockage.

[0040] In some embodiments, referring to Figure 7, a one-way valve 5 is provided in the one-way injection port 313, which is connected to the mixing tank 22. The one-way valve 5 only allows the slurry to flow into the mixing tank 22 from the scraper housing 31. The one-way valve 5 can completely block the backflow of slurry caused by the vibration of the mixing tank 22, and prevent the slurry remaining in the mixing tank 22 from flowing back into the scraper housing 31 due to gravity when the machine is stopped.

[0041] In some embodiments, referring to Figures 3 to 6, the scraper mechanism 3 includes a scraper housing 31. Inside the scraper housing 31, a slurry circulation chamber 311 extending along its length is provided. Two slurry inlets 312 are located at both ends of the slurry circulation chamber 311, and a one-way inlet 313 is located between the two slurry inlets 312. The slurry inlets 312 are respectively connected to the slurry circulation chamber 311 and the branch pipe 23, and the one-way inlet 313 is respectively connected to the slurry circulation chamber 311 and the mixing tank 22. By extending the slurry circulation chamber 311 along the length of the scraper mechanism 3, a symmetrical flow field with inlet at both ends and return flow in the middle is achieved. This eliminates the end-piling effect caused by traditional one-sided feeding and increases the slurry renewal frequency within the slurry circulation chamber 311.

[0042] In some embodiments, referring to Figure 3, the scraper mechanism 3 further includes scraper blades 32 symmetrically arranged at an acute angle at the lower part of the scraper housing 31. A strip-shaped discharge gap 33 is formed between the bottoms of the two scraper blades 32. The discharge gap 33 is located below the slurry circulation chamber 311, and the slurry flows out from the discharge gap 33 onto the substrate to be coated. Locking plugs 34, made of flexible rubber, are provided on both sides of the discharge gap 33 to prevent slurry from overflowing from both ends of the scraper housing 31. Fixing holes 38 are provided on both sides of the scraper housing 31, and the scraper blades 32 are provided with strip-shaped holes 39 corresponding to the fixing holes 38. Positioning pins 36 pass through the strip-shaped holes 39 to fix the scraper blades 32 to the scraper housing 31. The position of the scraper blades 32 on the scraper housing 31 can be adjusted by the strip-shaped holes 39, thereby adjusting the size of the discharge gap 33. Furthermore, a scraper pressure plate 35 is provided on the outer side of the scraper blade 32. The scraper pressure plate 35 is fixedly connected to the scraper blade 32 by fixing bolts 37. It can be seen that the scraper blade 32 is usually a thin sheet structure. If it is directly fixed by point contact with the positioning pin 36, the scraper blade 32 may wobble during movement. The design of the scraper pressure plate 35 can apply a certain pressure to the scraper blade 32, so that the scraper blade 32 is more stably fixed on both sides of the scraper housing 31. Preferably, the scraper blade 32 of this application is mostly made of stainless steel to lock the slurry and ensure that the scraper blade 32 adheres to the substrate surface. The two scraper blades 32 are arranged at an acute angle and adhere to the symmetrical sides of the scraper housing 31 to achieve adhesion and transmission when the scraper mechanism 3 makes linear movement.

[0043] The doctor blade mechanism 3 of this application adopts a semi-enclosed doctor blade design, which adheres to the substrate surface to form a closed doctor blade film. This effectively prevents the accumulation and drying of the paste inside the doctor blade housing 31, thereby extending the service life of the doctor blade mechanism 3 and improving the printing effect. In this application, the width of the doctor blade housing 31 ranges from 5mm to 20mm, preferably 10mm.

[0044] In some embodiments, referring to Figure 1, the semi-enclosed scraping device also includes a buffer chamber 6. The inlet of the buffer chamber 6 is connected to the outlet of the slurry tank 1. The outlet of the buffer chamber 6 is connected to the inlet 221 of the mixing tank 22 through the main pipe 4. The buffer chamber 6 is also connected to the air pressure system through the air pipe 7. It should be noted that this application does not limit the specific structure of the buffer chamber 6, as long as it can achieve the function of storing slurry. For example, if the buffer chamber 6 is a space formed by the inner cavity of the buffer tank 1, the capacity of the buffer chamber 6 does not need to be too large, as long as it can meet the requirement of uninterrupted operation during the replacement of the slurry tank 1. In other words, by placing the buffer chamber 6 between the main pipeline 4 and the slurry tank 1, the slurry in the slurry tank 1 is first forced into the buffer chamber 6, and then enters the main pipeline 4. When the slurry in the slurry tank 1 is about to run out, an alarm is triggered, and the feed inlet above the corresponding buffer chamber 6 is closed. Pressure is applied to the buffer chamber 6 through the air pressure system, causing the slurry in the buffer chamber 6 to enter the mixing tank 22. At this time, the operator can remove the slurry tank 1 without affecting normal production. After the slurry tank 1 is filled with slurry and installed in place, air pressure is applied to the slurry tank 1 through the air pressure system, the feed inlet of the corresponding buffer chamber 6 is opened, and the independent air pressure of the buffer chamber 6 is closed, thus restoring the normal downward conveying of slurry by the slurry tank 1. This achieves production without stopping the machine and greatly improves production efficiency.

[0045] In some embodiments, the slurry tank 1, the stirring mechanism 2, and the doctor blade mechanism 3 reciprocate on the substrate surface via a linear motion mechanism. The linear motion mechanism precisely controls the movement speed of the doctor blade mechanism 3 to improve printing uniformity and accuracy. The linear motion mechanism includes linear modules 8 and slide rails 9 respectively disposed at both ends of the doctor blade mechanism 3 along its length. One end of the doctor blade mechanism 3 is mounted on a sliding block of the linear module 8, and the other end of the doctor blade mechanism 3 is slidably connected to the slide rail 9 via a slider 12. The linear module 8 in this application is typically driven by a linear motor or a high-precision ball screw, providing high positioning accuracy and precise control over the movement speed of the doctor blade mechanism 3, thereby improving printing uniformity and accuracy and avoiding problems such as uneven printing or insufficient printing precision.

[0046] In some embodiments, one end of the squeegee mechanism 3 is mounted on the sliding block of the linear module 8 via a first lifting cylinder 10, and the other end of the squeegee mechanism 3 is mounted on the slider 12 via a second lifting cylinder 11. After the corresponding film or silicon wafer is printed, the squeegee mechanism 3 is lifted upwards and detached from the printed film or silicon wafer by the first lifting cylinder 10 and the second lifting cylinder 11 to unload the film or silicon wafer and quickly complete the loading of the next substrate. After the next substrate is loaded, the first lifting cylinder 10 and the second lifting cylinder 11 descend to bring the squeegee mechanism 3 into contact with the substrate to be printed, and then it is driven to perform linear motion by the linear module 8. This application can precisely control the pressure of the squeegee mechanism 3 by setting the first lifting cylinder 10 and the second lifting cylinder 11, so that the pressure between the squeegee mechanism 3 and the substrate is appropriate, thereby improving the uniformity and accuracy of printing.

[0047] In some embodiments, a pressure alarm is installed inside the slurry tank 1, and a sealing cover is installed on the feed inlet of the buffer chamber 6; when the pressure alarm is triggered, the sealing cover closes the feed inlet of the buffer chamber 6, thereby allowing the buffer chamber 6 to work independently, and the slurry tank 1 can be disassembled after the sealing cover is closed.

[0048] The semi-enclosed scraper device provided in this application has the following specific implementation steps:

[0049] Step 1: Apply pressure to the paste tank 1 using an air pressure system. An air pressure system is set up, and by adjusting the air pressure, a certain pressure is applied to the paste tank 1, allowing the paste to flow smoothly into the doctor blade housing 31, avoiding clogging and improving printing results. In this application, the pressure range of the air pressure system is 0.1 MPa to 0.5 MPa, preferably 0.3 MPa.

[0050] Step 2: Stir the slurry using stirring mechanism 2. Before the slurry is injected into the doctor blade mechanism 3, the slurry in the stirring tank 22 is stirred using stirring pump 21 to make the composition and viscosity of the slurry uniform, thereby improving the printing quality. The rotation speed range of stirring pump 21 is 100 rpm to 500 rpm, preferably 200 rpm.

[0051] Step 3: Precisely control the movement speed and pressure of the squeegee mechanism 3. By setting up the linear module 8, the first lifting cylinder 10, and the second lifting cylinder 11, the movement speed and pressure of the squeegee mechanism 3 are precisely controlled, thereby improving the uniformity and accuracy of printing. The control accuracy range of the linear module 8 is ±0.1mm / s to ±0.5mm / s, preferably ±0.2mm / s.

[0052] Step 4: Use the linear module 8 to evenly print the paste onto the corresponding film or silicon wafer. The linear module 8 enables the squeegee mechanism 3 to move in a straight line, thereby evenly printing the paste onto the corresponding film or silicon wafer and improving the printing effect. The movement speed of the linear module 8 ranges from 10 mm / s to 50 mm / s, preferably 20 mm / s.

[0053] In summary, the technical solution of this application can be widely used in fields such as battery manufacturing equipment, semiconductor manufacturing equipment, and automation equipment.

[0054] Firstly, in the field of battery manufacturing equipment, the semi-enclosed doctor blade device of this application can greatly improve the printing efficiency and accuracy of battery cell slurry, overcoming the shortcomings of traditional manual operation. Simultaneously, through the optimized design of the pneumatic system and stirring mechanism, it can effectively avoid clogging at the connection between the slurry tank 1 and the doctor blade mechanism 3, as well as the problem of uneven slurry composition and viscosity, thereby improving the printing quality of the battery cells.

[0055] Secondly, the semi-enclosed squeegee device of this application can also play an important role in the field of semiconductor manufacturing equipment. Many steps in the semiconductor manufacturing process require precise liquid or paste printing, such as photolithography and chemical vapor deposition. The device of this application can provide high-precision printing results, meeting the needs of semiconductor manufacturing and improving production efficiency and product quality.

[0056] Finally, in the field of automated equipment, the semi-enclosed scraper device of this application can achieve precise control of the scraper's movement speed and pressure through an automatic control system, realizing fully automated production, improving production efficiency, and reducing labor costs. At the same time, the design of this device is also suitable for large-scale production lines and can meet the needs of industrial production.

[0057] In summary, the semi-enclosed scraper device of this application has broad application prospects in fields such as battery manufacturing equipment, semiconductor manufacturing equipment, and automation equipment, with large market demand and good commercial value.

[0058] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A semi-enclosed scraping device, characterized in that, The device includes a slurry tank, a mixing mechanism, and a scraper mechanism connected in sequence. The mixing mechanism includes a mixing pump, a mixing tank connected to the mixing pump, and a branch pipe connected to the outlet of the mixing tank. The mixing tank has an inlet and at least one outlet. The inlet is connected to the slurry tank through a main pipe, and the outlet is connected to the internal cavity of the scraper mechanism through the branch pipe.

2. The semi-enclosed scraping device according to claim 1, characterized in that, The mixing tank is mounted on the scraper mechanism. The mixing tank has two discharge ports, which are arranged opposite to each other. The scraper mechanism has two slurry injection ports spaced apart. The two discharge ports are connected to the two slurry injection ports through two branch pipes, respectively.

3. The semi-enclosed scraping device according to claim 2, characterized in that, The scraper mechanism is also provided with a one-way injection port that communicates with the mixing tank. Part of the slurry that enters the scraper mechanism from the slurry injection port flows back into the mixing tank through the one-way injection port.

4. The semi-enclosed scraping device according to claim 3, characterized in that, A one-way valve is provided inside the one-way injection port.

5. The semi-enclosed scraping device according to claim 3, characterized in that, The scraper mechanism includes a scraper housing, inside which is a slurry circulation chamber extending along its length. Two slurry injection ports are located at both ends of the slurry circulation chamber along its length, and a one-way injection port is located between the two slurry injection ports. The slurry injection ports are respectively connected to the slurry circulation chamber and a branch pipe, and the one-way injection port is respectively connected to the slurry circulation chamber and a mixing tank.

6. The semi-enclosed scraping device according to claim 5, characterized in that, The scraper mechanism also includes scraper blades arranged symmetrically at an acute angle on both sides of the scraper housing, and a strip-shaped discharge gap is formed between the bottoms of the two scraper blades, which is located below the slurry circulation chamber.

7. The semi-enclosed scraping device according to claim 6, characterized in that, Locking plugs are provided on both sides of the discharge gap to prevent slurry from overflowing from both ends of the slurry circulation chamber.

8. The semi-enclosed scraping device according to claim 6, characterized in that, The scraper housing has fixing holes on both sides, and the scraper blade has a strip hole corresponding to the fixing hole. The positioning pin passes through the strip hole and fixes the scraper blade to the scraper housing.

9. The semi-enclosed scraping device according to claim 8, characterized in that, A scraper pressure plate is provided on the outer side of the scraper blade, and the scraper pressure plate is fixedly connected to the scraper blade by fixing bolts.

10. The semi-enclosed scraping device according to claim 1, characterized in that, It also includes a buffer chamber, the inlet of which is connected to the outlet of the slurry tank, and the outlet of the buffer chamber is connected to the inlet of the mixing tank through the main pipe.

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