Grouting tooling

Abstract

The utility model relates to tunnel construction equipment technical field provides grouting tool that can better reduce the grouting tool of gushing accident occurrence possibility in use, grouting tool includes the shell for inserting the hole channel, its inside forms and has the grouting hole channel, the grouting hole channel one end extends to the surface of shell and forms and has the grouting mouth, the other end extends to the surface of shell and forms and has the main out of the pulp mouth, the shell is connected with the out of the pulp cover, and the out of the pulp cover has the suit department that forms the package of the main out of the pulp mouth from the shell outside, the suit department and the shell form and have: the slurry cavity that receives the main out of the pulp mouth and discharges the slurry, the suit department includes the deformable portion with the elasticity, and the deformable portion is provided with: the section discharge hole channel for the slurry in the slurry cavity and flows outward, the discharge hole channel is configured: in the state without external force, the two side walls of discharge hole channel realize the closure of discharge hole channel in close conjunction, when the main out of the pulp mouth discharges the slurry, the two side walls of discharge hole channel are opened outward and realize the opening of discharge hole channel.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction equipment technology, and more specifically to tooling for sealing and grouting. Background Technology

[0002] During tunnel construction, if advanced detection reveals unfavorable geological conditions such as fractured zones ahead, direct excavation can easily lead to collapse accidents. Current technology typically employs pre-treatment using advanced grouting: boreholes are pre-drilled in a safe area ahead of the fractured zone; grouting equipment is extended along the borehole to a predetermined position via drill rods; and grout is injected into the fractured strata through the drill rods and grouting equipment, solidifying the rock mass within the tunnel excavation outline and ensuring the stability of the excavation face.

[0003] However, the geological structure of tunnel construction areas is complex, and hidden cavities (such as aquifers and solution cavities) often exist in the strata that store high-pressure water. When the borehole penetrates such high-pressure water cavities, during grouting operations, the high-pressure water from the strata may surge back into the construction area along the borehole and the grouting channels of the grouting equipment, causing water inrush accidents. This problem not only seriously threatens the safety of construction personnel and equipment, but also leads to construction interruptions, project delays, and even induces secondary disasters such as water inrush and collapses, becoming a key technical challenge restricting tunnel construction safety. Utility Model Content

[0004] One of the purposes of this utility model is to address the shortcomings of the existing technology by providing a grouting fixture that can better reduce the possibility of water inrush accidents during use, thus providing higher safety in use.

[0005] The overall technical solution of this utility model is as follows:

[0006] This invention addresses the problem of water backflow that easily occurs during the use of grouting equipment. Specifically, grouting equipment is often inserted into the drilled stratum to allow grout to be directionally delivered to a designated location. It contains grouting channels for directional delivery of grout. When high-pressure water is present in the stratum, this high-pressure water can easily flow back through the grouting channels to the area where grouting is being carried out, causing water to gush out and potentially leading to a safety accident.

[0007] In some implementations, a one-way valve structure can be installed in the grouting fixture to prevent backflow of water. However, due to the complex channel structure and precision mechanisms such as the valve core in the one-way valve, blockage problems often occur in actual use (the grout is often a solid-liquid mixture), which can easily block the smooth progress of construction.

[0008] Based on this, the present invention proposes a grouting fixture with a simpler structure that can better reduce the possibility of water inrush accidents during use, thus providing higher safety in use.

[0009] Specifically, the grouting fixture provided by this utility model includes a housing for insertion into a channel, the housing having a hollow cavity forming a grouting channel, one end of which extends to the surface of the housing to form a grouting port, and the other end of which extends to the surface of the housing to form a main grouting outlet.

[0010] A slurry outlet sleeve is connected to the shell. The slurry outlet sleeve has a sleeve portion that wraps around the main slurry outlet from the outside of the shell. A slurry cavity is formed between the sleeve portion and the shell to receive the slurry discharged from the main slurry outlet.

[0011] The kit includes a flexible, deformable portion, which is provided with a discharge channel for the slurry in the slurry chamber to flow outward.

[0012] The discharge channel is configured as follows:

[0013] When no external force is applied, the two side walls of the discharge channel fit together to close the discharge channel.

[0014] When slurry is discharged from the main outlet, the two side walls of the discharge channel are pushed outward to open the discharge channel.

[0015] By covering the main grout outlet with a grout outlet sleeve, and providing a discharge channel in the elastic part of the grout outlet sleeve that is normally closed but can be opened by grout from the inside for directional drainage, the grouting equipment can be smoothly used to output grout into the formation. Furthermore, when the pressure of the high-pressure water in the formation is greater than the grouting pressure, the pressure of the high-pressure water can exert pressure from the outside to the inside on the grout outlet sleeve, thereby pressing the sidewall of the discharge channel inward and closing the discharge channel. This prevents high-pressure water from flowing out through the grouting equipment and causing a water inrush accident, thus improving the safety of grouting operations using the grouting equipment.

[0016] In some embodiments, the housing includes:

[0017] The grouting body has a hollow cavity with grout inlet channels inside;

[0018] The grouting head is detachably connected to the grouting body, and its interior is hollow with grout outlet channels.

[0019] The grouting port is located on the grouting body and is connected to the grout inlet channel;

[0020] The main grout outlet is located on the grouting head and is connected to the grout outlet channel;

[0021] Furthermore, the inlet and outlet grouting channels are connected to form a grouting channel. By making the grouting head detachable, it is convenient to disassemble and maintain the grouting head; it can also be better equipped with a variety of grouting heads with different main outlets, so as to facilitate the replacement of grouting heads with different main outlets according to different grouting needs.

[0022] Furthermore, in some embodiments, the grout outlet sleeve is fixedly fitted onto the grouting head. This facilitates the disassembly and replacement of the grout outlet sleeve and the grouting head together.

[0023] In some embodiments, the main grout outlet is configured to be aligned with the discharge channel. This allows the grouting pressure to be applied directly and quickly to the discharge channel, opening the channel by expanding its sidewalls. This also allows the grout to be discharged more quickly and directly, improving the efficiency of grouting operations, as well as the smoothness and stability of grout discharge.

[0024] Furthermore, in some embodiments, the shell is also provided with a side grout outlet, one end of which is connected to the grouting channel and the other end of which is connected to the grouting cavity.

[0025] The side outlets are configured to be non-aligned with the discharge channel. By setting several side outlets, the grouting pressure on the discharge channel in the grout sleeve can be reduced while ensuring the same grout flow rate. This better avoids the following situation: the main outlet needs to be set too large, resulting in excessive grouting impact pressure on the discharge channel, which in turn makes it difficult to close the discharge channel when encountering high-pressure water, and makes it impossible to quickly close the discharge channel to stop the high-pressure water from flowing out.

[0026] Furthermore, in some embodiments, there are several side grout outlets, and these side grout outlets are spaced apart around the grouting channel. By distributing the side grout outlets in a circumferential, spaced manner, the grouting pressure can be more evenly distributed.

[0027] In some embodiments, the housing surface has an outward-facing injection groove, and a sealing plate that is elastic and can protrude outwards from the outer periphery of the housing is also connected to the housing.

[0028] The sealing plate covers the opening of the injection tank to form an injection cavity between itself and the inner wall of the injection tank;

[0029] The injection chamber is connected to an inlet pipe that allows external liquid to flow into it. By installing a sealing plate structure, water can be injected into the injection chamber to secure the grouting fixture within the formation duct, ensuring the stability of the grouting operation. This also better prevents high-pressure water from flowing out from between the grouting fixture and the inner wall of the formation duct, thus preventing water inrush accidents and further improving construction safety.

[0030] Furthermore, in some embodiments, the injection groove is an annular groove arranged around the grouting channel to surround the surface of the shell.

[0031] The sealing plate is an annular plate that fits onto the housing and is adapted to cover the annular groove. This allows the grouting fixture to engage with the inner wall of the grouting fixture in the circumferential direction, further improving the stability of the engagement and positioning, and more comprehensively preventing high-pressure water from flowing out.

[0032] Furthermore, in some embodiments, a first insertion groove is provided on one side wall of the injection tank, and a second insertion groove is provided on the other side wall.

[0033] One end of the sealing plate is adapted to be inserted into the first insertion slot and can move upward along the axial direction of the housing in the first insertion slot;

[0034] The other end of the sealing plate is adapted to be inserted into the second insertion slot and can move along the axial direction of the housing within the second insertion slot. This provides the sealing plate with expansion and contraction space for deformation, reducing the possibility of damage during the expansion and contraction of the sealing plate.

[0035] In some embodiments, the injection tank is positioned between the injection port and the main outlet port in the axial direction of the housing.

[0036] Furthermore, the shell has an end located on one side of the injection tank and equipped with a main grout outlet. The outer surface of this end is configured to neither have a groove structure formed by recesses on the outer peripheral side of the shell, nor a protrusion structure on the outer peripheral side of the shell. Considering that the concave-convex structure on the outer peripheral side of the shell easily traps grout (grout consolidation zone), by avoiding the formation of a groove structure on the surface of the end of the grouting tool used to output grout, it is possible to better prevent the formation of solidified grout on the outer periphery of the grouting tool that prevents the grouting tool from being pulled out when the grout solidifies. This improves the ease of disassembling and pulling out the grouting tool after grouting construction, reduces damage to the grouting tool during disassembly, and thus better extends the service life of the grouting tool.

[0037] The main beneficial effects of the above technical solution are as follows:

[0038] When using the grouting fixture of this utility model for grouting work, the discharge channel for discharging grout can open / close according to changes in internal and external pressure, so that: the grout can be smoothly transported through the grouting channel in a directional manner; moreover, when encountering high-pressure water with a pressure greater than the grouting pressure, the discharge channel can close under the action of external high pressure, preventing the high-pressure water from flowing out through the grouting fixture and causing a water inrush accident, thereby improving construction safety. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the grouting equipment under normal operating conditions.

[0041] Figure 2 This is a schematic diagram of the grouting body and grouting head.

[0042] Figure 3 A schematic diagram of the grouting fixture in its working state.

[0043] Figure 4 A schematic diagram of grouting equipment during grouting.

[0044] Figure 5 This is a schematic diagram of the discharge channel of the grouting tool being closed by external water pressure. Detailed Implementation

[0045] The present invention will be illustrated with specific examples below: Example:

[0046] Grouting fixtures, as attached Figure 1 To be continued Figure 5 As shown, it is used to insert into the formation channel 7 so that the slurry can be directionally delivered to the depth of the formation channel 7.

[0047] As attached Figure 1 As shown, the grouting fixture in this embodiment includes a housing 1 for insertion into a channel. The housing 1 has a hollow cavity forming a grouting channel 1.1. One end of the grouting channel 1.1 extends to the surface of the housing 1 and forms a grouting port 1.2, which is connected to the grouting channel 1.1 at one end and connected to the external space of the housing 1 at the other end. The grouting port 1.2 supplies grout to enter the grouting channel 1.1.

[0048] The other end of the grouting channel 1.1 extends to the surface of the shell 1 and forms a main grout outlet 1.3, one end of which is connected to the grouting channel 1.1 and the other end of which is connected to the external space of the shell 1; the main grout outlet 1.3 is used to output the grout in the grouting channel 1.1 to the outside.

[0049] As attached Figure 1 As shown, a slurry outlet sleeve 2 is also connected to the housing 1. The slurry outlet sleeve 2 has a sleeve part 2.1 that wraps around the main slurry outlet 1.3 from the outside of the housing 1 to prevent the slurry in the main slurry outlet 1.3 from being discharged outward. A slurry receiving cavity 3 is formed between the sleeve part 2.1 and the housing 1 to receive the slurry discharged from the main slurry outlet 1.3.

[0050] The assembly 2.1 includes an elastic, deformable part made of elastic materials such as rubber, canvas, or silicone. This deformable part is provided with a discharge channel 2.2 for the slurry in the slurry chamber 3 to flow outward. Of course, the slurry outlet sleeve 2 can also be made entirely of elastic materials such as rubber, canvas, or silicone.

[0051] As attached Figure 2 As shown, when no external force is applied, the two side walls of the discharge channel 2.2 are in close contact to close the discharge channel 2.2, preventing liquid from the external space from entering the slurry chamber 3.

[0052] As attached Figure 3 As shown, when the slurry is discharged from the main outlet 1.3 into the slurry chamber 3, the impact of the grouting pressure causes the two side walls of the discharge channel 2.2 to be opened outward, so that the discharge channel 2.2 is in an open state that can discharge the slurry in the slurry chamber 3 outward.

[0053] For example, the elastic deformable portion includes an outwardly protruding extension, and a cut is made in this protruding extension to form a slit: one end connects to the slurry chamber 3, and the other end connects to the external space of the slurry outlet sleeve 2; this slit forms a discharge channel 2.2. The specific length of the discharge channel 2.2 is set according to requirements.

[0054] The housing 1 can be a one-piece structure.

[0055] Or, as attached Figure 2 To be continued Figure 3 As shown, the housing 1 may include a grouting body 1a and a grouting head 1b detachably connected to the grouting body 1a. The grouting head 1b may be inserted into one end of the grouting body 1a and detachably fixed to the grouting body 1a by means of, for example, screws, threaded structures or snap-fit ​​structures.

[0056] Furthermore, the grouting body 1a has a hollow cavity forming an inlet channel 1a.1; the grouting head 1b has a hollow cavity forming an outlet channel 1b.1. The grouting port 1.2 is located on the grouting body 1a and is connected to the inlet channel 1a.1; the main outlet port 1.3 is located on the grouting head 1b and is connected to the outlet channel 1b.1; the inlet channel 1a.1 and the outlet channel 1b.1 are connected to form the grouting channel 1.1.

[0057] At this time, the slurry can enter the slurry inlet channel 1a.1 from the slurry inlet 1.2, then flow into the slurry outlet channel 1b.1 from the slurry inlet channel 1a.1, and be discharged into the slurry chamber 3 through the main slurry outlet 1.3 from the slurry outlet channel 1b.1.

[0058] At this time, the grout outlet sleeve 2 can also be fixedly fitted onto the grouting head 1b. For example, the grout outlet sleeve 2 is fitted onto the grouting head 1b, and the fitted part of the grout outlet sleeve 2 can be detachably fixed onto the grouting head 1b using clamps (or cable ties or similar fixing methods).

[0059] The main slurry outlet 1.3 can be configured to be aligned with the discharge channel 2.2. For example, see attached... Figure 2 To be continued Figure 3 As shown, in the extension direction of the grouting channel 1.1, the main grout outlet 1.3 is positioned opposite to the discharge channel 2.2.

[0060] The housing 1 may also be provided with a side grout outlet 1.4, which is connected at one end to the grouting channel 1.1 and at the other end to the grout chamber 3. The side grout outlet 1.4 is also used to allow the grout in the grouting channel 1.1 to flow out into the grout chamber 3, and the side grout outlet 1.4 is configured to be non-aligned with the discharge channel 2.2.

[0061] For example, attached Figure 2 To be continued Figure 3 As shown, the main grout outlet 1.3 is located at the end where the grouting head 1b is aligned with the discharge channel 2.2, while the side grout outlet 1.4 is located on the side wall of the grouting head 1b.

[0062] There may be several (greater than or equal to 2) side grout outlets 1.4, and these several side grout outlets 1.4 are distributed at intervals around the grouting channel 1.1.

[0063] The surface of the housing 1 may also have an outwardly opening injection groove 1.5. A sealing plate 4 (e.g., a plate made of wear-resistant rubber) with elasticity, capable of protruding outwards from the housing 1, is also connected to the housing 1. The sealing plate 4 covers the opening of the injection groove 1.5, forming an injection cavity 5 between itself and the inner wall of the injection groove 1.5. Furthermore, the injection cavity 5 is connected to an inlet pipe 6 for external liquid to flow into the injection cavity 5.

[0064] By supplying liquid (e.g., water) into the inlet pipe 6, the sealing plate 4 can be driven to deform outward so that it can make contact with the formation channel 7 and press against it, thereby positioning and locking the grouting tool in the formation channel 7.

[0065] As attached Figure 2 To be continued Figure 3 As shown, a first insertion groove 1.51 is provided on one side wall of the injection tank 1.5, and a second insertion groove 1.52 is provided on the other side wall. One end of the sealing plate 4 is adapted to be inserted into the first insertion groove 1.51 and can move along the axial direction of the housing 1 in the first insertion groove 1.51; the other end of the sealing plate 4 is adapted to be inserted into the second insertion groove 1.52 and can move along the axial direction of the housing 1 in the second insertion groove 1.52; so that the sealing plate 4 is snapped onto the housing 1.

[0066] The injection tank 1.5 can be a groove of any shape arranged according to requirements.

[0067] For example, attached Figure 2 To be continued Figure 3 As shown, the injection tank 1.5 can be an annular groove arranged around the injection channel 1.1 to surround the surface of the housing 1. Matching the annular groove structure of the injection tank 1.5, the sealing plate 4 can also be an annular plate fitted onto the housing 1 and adapted to cover the annular groove.

[0068] Furthermore, in the axial direction of the housing 1, the injection tank 1.5 can be placed between the injection port 1.2 and the main outlet port 1.3.

[0069] Furthermore, the housing 1 has an end located on one side of the injection tank 1.5 and provided with a main slurry outlet 1.3. The outer surface of this end is configured such that it does not have a groove structure formed by recessing on the surface of the housing 1 (i.e., a groove structure that is low in the middle and high on both sides), nor does it have a protrusion structure formed on the outer peripheral sidewall of the housing 1.

[0070] For example, in the direction from the grouting channel 1.1 to the main grout outlet 1.3, the outer diameter of this end can gradually decrease; or, as shown in the appendix... Figure 2 To be continued Figure 3 As shown, the outer diameter of this end can be gradually reduced first, then kept constant, and then gradually reduced again.

[0071] When using the above-mentioned grouting equipment for grouting construction:

[0072] As attached Figure 4 As shown, insert the shell 1 into the formation channel 7 until it reaches the required positioning position.

[0073] Then, liquid (e.g., water) is injected into the inlet pipe 6 to fill the injection chamber 5 and drive the sealing plate 4 to deform outward until the sealing plate 4 is attached to the side wall of the formation channel 7, thus completing the positioning and fixing of the grouting tool.

[0074] Subsequently, the grout is introduced from the grouting port 1.2. The grout flows sequentially through the grout inlet channel 1a.1 and the grout outlet channel 1b.1, and flows from the main grout outlet 1.3 and the side grout outlet 1.4 into the grout receiving cavity 3. As the grout accumulates in the receiving cavity 3, sufficient grouting pressure is formed to push the two side walls of the discharge channel 2.2 outward, so that the discharge channel 2.2 is opened to allow the grout to be output outward. The grout can then be transported from the grouting equipment to the depth of the formation channel 7 for grouting construction.

[0075] When encountering high-pressure water in formation channel 7:

[0076] As attached Figure 5As shown, when the pressure of the high-pressure water body is greater than the grouting pressure, the high-pressure water body will exert pressure on the grout outlet sleeve 2 around its outer periphery as shown in the attached figure. Figure 5 The pressure indicated by the middle arrow causes the two side walls of the discharge channel 2.2 to fit together, thereby closing the discharge channel 2.2. This prevents high-pressure water from flowing into the grouting channel 1.1 and out through the grouting port 1.2, thus preventing high-pressure water from flowing out through the grouting fixture and causing a water inrush accident, and improving construction safety.

[0077] Of course, the closure of the discharge channel 2.2 will only occur when the pressure of the high-pressure water body is greater than the grouting pressure. When the grouting pressure is greater than the pressure of the high-pressure water body, the grouting fluid will continuously open the discharge channel 2.2 and push the high-pressure water body to flow deeper into the formation channel 7, making it less likely for water inrush accidents to occur.

[0078] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present utility model, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" in the description should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.

[0079] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A grouting fixture, comprising a housing (1) for insertion into a duct, wherein a grouting duct (1.1) is formed in a hollow cavity inside the housing (1.1), one end of the grouting duct (1.1) extends to the surface of the housing (1) and forms a grouting port (1.2), and the other end extends to the surface of the housing (1) and forms a main grouting outlet (1.3). Its features are, The shell (1) is connected to a slurry outlet sleeve (2), which has a sleeve part (2.1) that wraps around the main slurry outlet (1.3) from the outside of the shell (1). A slurry cavity (3) is formed between the sleeve part (2.1) and the shell (1) to receive the slurry discharged from the main slurry outlet (1.3). The assembly (2.1) includes an elastic deformable portion, which is provided with a discharge channel (2.2) for the slurry in the slurry chamber (3) to flow outward. The discharge channel (2.2) is configured as follows: When no external force is applied, the two side walls of the discharge channel (2.2) are in close contact to achieve the closure of the discharge channel (2.2); When slurry is discharged from the main outlet (1.3), the two side walls of the discharge channel (2.2) are pushed outward to open the discharge channel (2.2).

2. The grouting fixture according to claim 1, characterized in that: The housing (1) includes: The grouting body (1a) has a cavity inside which a grout inlet channel (1a.1) is formed. The grouting head (1b) is detachably connected to the grouting body (1a), and its interior is hollowly formed with grout outlet channels (1b.1). The grouting port (1.2) is provided on the grouting body (1a) and is connected to the grout inlet channel (1a.1); The main grout outlet (1.3) is located on the grouting head (1b) and is connected to the grout outlet channel (1b.1); Furthermore, the grout inlet channel (1a.1) and the grout outlet channel (1b.1) are connected to form the grout injection channel (1.1).

3. The grouting fixture according to claim 2, characterized in that: The grout outlet sleeve (2) is fixedly mounted on the grouting head (1b).

4. The grouting fixture according to any one of claims 1 to 3, characterized in that: The main outlet (1.3) is configured to be aligned with the discharge channel (2.2).

5. The grouting fixture according to claim 4, characterized in that: The shell (1) is also provided with a side outlet (1.4) that is connected to the grouting channel (1.1) at one end and to the grouting cavity (3) at the other end. The side outlet (1.4) is configured to be non-aligned with the discharge channel (2.2).

6. The grouting fixture according to claim 5, characterized in that: The side grout outlet (1.4) is a plurality of such outlets, and the plurality of side grout outlets (1.4) are distributed at intervals around the grouting channel (1.1).

7. The grouting fixture according to claim 1, characterized in that: The surface of the housing (1) has an outward-facing liquid injection groove (1.5), and the housing (1) is also connected to a sealing plate (4) that is elastic and can protrude outward from the outer periphery of the housing (1). The sealing plate (4) covers the opening of the injection tank (1.5) to form an injection cavity (5) between itself and the inner wall of the injection tank (1.5). The injection chamber (5) is connected to an inlet pipe (6) for external liquid to flow into the injection chamber (5).

8. The grouting fixture according to claim 7, characterized in that: The injection groove (1.5) is an annular groove arranged around the grouting channel (1.1) to surround the surface of the housing (1); The sealing plate (4) is an annular plate that is fitted onto the housing (1) and adapted to cover the annular groove.

9. The grouting fixture according to any one of claims 7 to 8, characterized in that: The injection tank (1.5) has a first insertion groove (1.51) on one side wall and a second insertion groove (1.52) on the other side wall. One end of the sealing plate (4) is adapted to be inserted into the first insertion slot (1.51) and can move in the first insertion slot (1.51) along the axial direction of the housing (1); The other end of the sealing plate (4) is adapted to be inserted into the second insertion slot (1.52) and can move in the second insertion slot (1.52) along the axial direction of the housing (1).

10. The grouting fixture according to any one of claims 7 to 8, characterized in that: In the axial direction of the housing (1), the injection tank (1.5) is positioned between the grouting port (1.2) and the main grouting port (1.3); Furthermore, the housing (1) has an end located on one side of the injection tank (1.5) and provided with the main slurry outlet (1.3). The outer surface of the end is configured such that it does not have a groove structure formed by recessing on the outer peripheral side of the housing (1), nor does it have a protrusion structure that protrudes on the outer peripheral side of the housing (1).

Images