High-pressure grouting system

Abstract

The high-pressure grouting system comprises a batching box and a mixing box, a powder mixing cavity and a slurry mixing cavity which are separated from each other are formed in the mixing box, and the inlet end of the powder mixing cavity is connected with the batching box through a first feeding pipe; the powder mixing cavity is communicated with the slurry mixing cavity through a feeding port; a first feeding auger is arranged in the powder mixing cavity, and a second feeding auger is arranged in the slurry mixing cavity; a water conveying module is further arranged in the slurry mixing cavity; the outlet end of the slurry mixing cavity is connected with a slurry temporary storage tank through a second feeding pipe, and a stirring module is further arranged on the slurry temporary storage tank; the slurry temporary storage tank is further connected with a pumping module, and the outlet end of the pumping module is connected with the grouting machine. According to the slurry mixing device, slurry mixing is divided into two steps of powder and slurry mixing through the material mixing box, meanwhile, stirring and feeding are conducted synchronously through the arrangement of the feeding reaming holes, feeding is not needed after stirring is completed, continuous supply of slurry is achieved, and the grouting efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of civil construction equipment, and in particular to a high-pressure grouting system. Background Art

[0002] High-pressure grouting is a process that uses hydraulic pressure, air pressure or electrochemical principles to uniformly inject slurry into the stratum, surrounding rock, backfill, and lining through a grouting pipe. The slurry removes moisture and air from soil particles or rock cracks by filling, penetrating, and compacting, and then occupies their position. After a certain period of time, the slurry and the original loose soil particles or cracks are bonded into a whole, forming a "stone body" with high strength, new structure, high waterproof performance, and good chemical stability, thereby achieving the purpose of waterproofing and plugging leaks;

[0003] In the prior art, grouting slurry is generally prepared on-site by a mixer, and the slurry is extracted by a pump and transported to the grouting machine. However, in actual production, the production speed of the mixer is generally slower than the extraction speed of the pump. At the same time, the stirring of the mixer takes time, so the slurry can only be fed intermittently, which results in the slurry cannot be continuously supplied, affecting the efficiency of high-pressure grouting. Summary of the invention

[0004] The main purpose of the present application is to provide a high-pressure grouting system, aiming to solve the defect of low grouting efficiency in the prior art.

[0005] This application achieves the above objectives through the following technical solutions:

[0006] A high-pressure grouting system includes a batching box;

[0007] A mixing box, wherein the mixing box is provided with a powder mixing chamber and a slurry mixing chamber separated from each other, the inlet end of the powder mixing chamber is connected to the batching box through a first feeding pipe; the powder mixing chamber is connected to the slurry mixing chamber through a feeding port; a first feeding auger is provided in the powder mixing chamber, and a second feeding auger is provided in the slurry mixing chamber; a water supply module for supplying slurry mixing water is also provided in the slurry mixing chamber;

[0008] A slurry temporary storage tank, the inlet end of which is connected to the slurry mixing chamber through a second feeding pipe; a stirring module is also provided on the slurry temporary storage tank.

[0009] A pumping module is connected to the slurry temporary storage tank, and an outlet end of the pumping module is connected to a grouting machine.

[0010] Optionally, a batching box is arranged on the top of the mixing box, and a connecting pipe is arranged on the batching box, and the connecting pipe is connected to the first feeding pipe through a flange plate;

[0011] Optionally, a plug-in slot is provided on the connecting pipe, and an adjustment plate for adjusting the on-off state of the connecting pipe is slidably provided in the plug-in slot; a support ring adapted to the adjustment plate is also provided in the connecting pipe.

[0012] Optionally, a partition plate is provided in the middle of the mixing box, and the partition plate is arranged along the length direction of the mixing box. The upper side of the partition plate is a powder mixing chamber, and the lower side is a slurry mixing chamber; along the feeding direction of the first feeding auger, the feeding port is provided at the end of the powder mixing chamber.

[0013] Optionally, the conveying direction of the first feeding auger is opposite to the transmission direction of the second feeding auger. Along the axial direction of the first feeding auger, a plurality of stirring rods are arranged on the first feeding auger, and each of the stirring rods is provided with a mixing plate.

[0014] Optionally, a plurality of mixing blades are provided on the second feeding auger along the axial direction of the second feeding auger.

[0015] Optionally, the water delivery module includes a water delivery pump and a water delivery pipe connected to each other, a spray pipe is provided on the top of the slurry mixing chamber, and the spray pipe is connected to the water delivery pipe; along the axial direction of the spray pipe, a plurality of spray heads are provided on the spray pipe.

[0016] Optionally, along the feeding direction of the second feeding auger, the distance between two adjacent spray heads increases linearly, and the unit spray volume of each spray head decreases linearly.

[0017] Optionally, the stirring module includes a support frame, which is clamped on the top of the slurry temporary storage tank; the support frame is provided with a stirring motor and a stirring shaft connected to each other by power, and the stirring shaft is also provided with a plurality of stirring paddles inserted into the slurry temporary storage tank;

[0018] Optionally, a pumping tank is also provided on the outer circumferential surface of the slurry temporary storage tank, and a plurality of discharge holes are provided on the outer circumferential surface of the slurry temporary storage tank, each of the discharge holes connects the slurry temporary storage tank with the pumping tank; a pumping pipe connected to the pumping module is provided in the pumping tank.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The present application includes a batching box and a mixing box, wherein the mixing box is provided with a powder mixing chamber and a slurry mixing chamber separated from each other, the inlet end of the powder mixing chamber is connected to the batching box through a first feeding pipe; the powder mixing chamber is connected to the slurry mixing chamber through a feeding port; a first feeding auger is provided in the powder mixing chamber, and a second feeding auger is provided in the slurry mixing chamber; a water delivery module for supplying slurry mixing water is also provided in the slurry mixing chamber; the outlet end of the slurry mixing chamber is connected to a slurry temporary storage tank through a second feeding pipe, and a stirring module is also provided on the slurry temporary storage tank; the slurry temporary storage tank is also connected to a pumping module, and the outlet end of the pumping module is connected to a grouting machine;

[0021] When in use, workers fill cement, aggregate and other powdered materials into the batching box according to the proportion, and then the materials enter the powder mixing chamber through the first feeding pipe. In the powder mixing chamber, the first feeding auger mixes the powders evenly while conveying the materials. The stirred powders enter the slurry mixing chamber through the feeding port, and after being mixed and stirred with water in the slurry mixing chamber, they are transported to the slurry temporary storage tank through the second feeding auger. While the slurry is continuously stirred and mixed in the slurry temporary storage tank, the pumping module extracts the slurry and transports it to the grouting machine.

[0022] Compared with the prior art, the present invention divides the mixing of slurry into two steps of powder mixing and slurry mixing through a mixing box, and realizes the synchronous stirring and feeding through the setting of feeding reaming holes, and no longer needs to wait for the stirring to be completed before feeding, thereby realizing the continuous production and uninterrupted supply of slurry, and improving the efficiency of grouting operation;

[0023] Secondly, by adjusting the feeding speed of the feeding auger and the batching box, the slurry production speed of the entire production line can be effectively adjusted to match the grouting speed and avoid excessive slurry; when the slurry demand is large, in addition to increasing the feeding speed and the rotation speed of the feeding auger, the slurry temporary storage tank can also be used to stir the slurry while ensuring the feeding speed. Ensure that the slurry can be evenly mixed and the quality of the slurry is guaranteed, thereby improving the equipment's adaptability to different working conditions.

[0024] Finally, the present application can solve the problem of slow slurry supply speed by segmenting the internal structure of the mixing box. It not only has a simple structure, but also controls the cost of the equipment compared to setting up multiple stirring devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a high-pressure grouting system provided in Embodiment 1 of the present application;

[0026] Figure 2 An exploded diagram of a high-pressure grouting system provided in Embodiment 1 of the present application;

[0027] Figure 3 A cross-sectional view of a high-pressure grouting system provided in Embodiment 1 of the present application;

[0028] Figure 4 is a cross-sectional view of a mixing box;

[0029] Figure 5 It is a structural cross-sectional view of the batching box;

[0030] Figure 6 It is a structural schematic diagram of a slurry temporary storage tank;

[0031] Figure markings: 1- batching box, 2- mixing box, 3- first feeding pipe, 4- feeding port, 5- first feeding auger, 6- second feeding reamer, 7- slurry temporary storage tank, 8- second feeding pipe, 9- pumping module, 10- grouting machine, 11- connecting pipe, 12- flange plate, 13- plug-in slot, 14- adjusting plate, 15- supporting ring, 16- partition plate, 17- stirring rod, 18- mixing plate, 19- mixing paddle, 20- water pump, 21- water pipe, 22- spray pipe, 23- spray head, 24- supporting frame, 25- stirring motor, 26- stirring shaft, 27- stirring paddle, 28- extraction tank, 29- discharge hole, 30- extraction pipe, 201- powder mixing chamber, 202- slurry mixing chamber.

[0032] The purpose, features and advantages of this application will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Implementation Method 1

[0038] Reference Figures 1 to 6 This embodiment is an optional embodiment of the present application, which discloses a high-pressure grouting system, including a batching box 1 and a mixing box 2, wherein the batching box 1 is installed on the top of the mixing box 2, a connecting pipe 11 is provided at the bottom of the batching box 1, and a first feeding pipe 3 is provided on the top of the mixing box 2, wherein the connecting pipe 11 is connected to the first feeding pipe 3 via a flange plate 12;

[0039] At the same time, a plug-in groove 13 is also provided on the connecting pipe 11, and the plug-in groove 13 is provided along its radial direction. An adjustment plate 14 is slidably provided in the plug-in groove 13. A support ring 15 is also provided in the connecting pipe 11, and the support ring 15 is in contact with the bottom surface of the adjustment plate 14.

[0040] The end of the adjustment plate 14 located outside the connecting tube 11 is provided with an adjustment handle, and the end inside the connecting tube 11 is provided with a limit plate;

[0041] By adjusting the plate 14 to be withdrawn or retracted to control the opening size of the connecting pipe 11, on the one hand, the release speed of the powder can be controlled, thereby adjusting the production speed of the entire production line; on the other hand, by adjusting the plate 14 to close the connecting pipe 11, the staff can add powder according to the number of portions and then discharge the material, that is, the supply of powder is achieved in an intermittent feeding manner, which is convenient for the staff to accurately grasp the proportion of ingredients. At the same time, when the material ratio changes, the above operation can also achieve rapid conversion of materials with different ratios;

[0042] A partition plate is further provided in the mixing box 2 along the length direction of the mixing box 2, and the partition plate is provided in the middle of the mixing box 2 along the height direction of the mixing box 2, so as to divide the mixing box 2 into upper and lower chambers, the upper chamber being a powder mixing chamber 201, and the lower chamber being a slurry mixing chamber 202, and the powder mixing chamber 201 is connected to the first feeding pipe 3;

[0043] A first feeding auger 5 is arranged in the powder mixing chamber 201, and a second feeding auger is rotatably arranged in the slurry mixing chamber 202. The feeding directions of the first feeding reaming hole and the second feeding reaming hole 6 are opposite. A feeding port 4 is arranged on the partition plate, and the feeding port 4 connects the powder mixing chamber 201 and the slurry mixing chamber 202. A second feeding pipe 8 connected to the slurry mixing chamber 202 is also arranged at the bottom of the mixing box 2;

[0044] It should be noted that, along the feeding direction of the first feeding auger 5, the first feeding pipe is arranged at the inlet end of the first feeding auger 5, and the feeding port 4 is arranged at the outlet end. Relative to the feeding direction of the second feeding auger, the second feeding pipe 8 is located at its outlet end, that is, along the length direction of the mixing box 2, the first feeding pipe and the second feeding pipe are located on the same side, and the feeding port 4 is located on the other side;

[0045] Furthermore, along the axis of the first feeding auger 5, a plurality of stirring rods 17 are provided on the first feeding auger 5, and a clamping groove is provided at the free end of each stirring rod 17, and a mixing plate 18 is inserted in each of the clamping grooves, and a fixing screw for fixing the mixing is also provided on the stirring rod 17;

[0046] It should be noted that the mixing plate 18 is in a sheet-like structure as a whole, and its length direction is parallel to the axial direction of the first feeding auger 5;

[0047] The above-mentioned structural setting can ensure that the mixing plate 18 has the largest contact area with the powder during the rotation process, so that the powder is continuously stir-fried to achieve uniform mixing of the powder;

[0048] Along the axial direction of the second feeding auger, a plurality of mixing blades 19 are arranged on the second feeding auger;

[0049] The above arrangement can form a U-shaped material conveying path in the mixing box 2. The above running path makes maximum use of the internal space of the mixing box 2 and prolongs the moving path of the material, thereby buying enough time for the mixing of the powder and the slurry, and ensuring the mixing quality of the slurry.

[0050] Secondly, the above technical solution is adopted to achieve the simultaneous mixing and conveying of materials, thereby achieving continuous feeding of slurry, ensuring that the grouting machine 10 can operate continuously and improving the efficiency of the grouting operation;

[0051] Furthermore, a spray pipe 22 is also provided in the slurry mixing chamber 202, and the spray pipe 22 is arranged along the length direction of the mixing box 2, and its inlet end extends through the mixing box 2. The grouting system also includes a conveying module, and the water delivery module includes a water delivery pump 20 and a water delivery pipe 21, wherein the outlet end of the water delivery pump 20 is connected to the water delivery pump 20 and an external water source, and the outlet end of the water delivery pipe 21 is connected to an end of the spray pipe 22 extending through a quick structure, thereby realizing the delivery of slurry mixing water;

[0052] A plurality of spray heads 23 are also provided at one end of the spray pipe 22 located in the slurry mixing chamber 202. Along the feeding direction of the second feeding auger, the distance between two adjacent spray heads 23 increases linearly, and the unit spray volume of each spray head 23 decreases linearly.

[0053] By setting a plurality of spray heads 23, water can be added during the entire slurry preparation process, so that feeding and slurry preparation can be carried out simultaneously; at the same time, by controlling the spacing between the spray heads 23 and the unit spray volume, the water output in different areas can be controlled, that is, along the feeding direction of the second feeding auger, the water delivery at one end close to the feeding port 4 is greater than the water delivery at the other end, so that most of the water is concentrated at the rear end for transportation;

[0054] At one end close to the second feeding pipe 8, the slurry has been prepared. At this time, it is not advisable to add a large amount of water, otherwise the slurry will be diluted. Therefore, the above-mentioned water distribution ratio of the present application matches the feeding direction, and the powder can be mixed with the water at the first time and fully stirred and mixed to ensure the quality of the slurry; on the other hand, it can avoid excessive water at one end of the second feeding pipe 8, and the water enters the slurry temporary storage tank 7 through the second feeding pipe 8, thereby controlling the slurry quality;

[0055] Furthermore, the high-pressure grouting system further comprises a slurry temporary storage tank 7 and a pumping module 9, wherein the inlet end of the slurry temporary storage tank 7 is connected to the second feeding pipe 8, so that the material is directly introduced into the slurry temporary storage tank 7;

[0056] A stirring module is also provided on the slurry temporary storage tank 7, and the stirring module includes a support frame 24, and an arc-shaped limit block is provided on the bottom surface of the support frame 24, and the inner wall of the limit block is in contact with the outer wall of the slurry temporary storage tank 7, so that the support frame 24 is clamped on the top of the slurry temporary storage tank 7; a stirring motor 25 and a stirring shaft 26 are provided on the support frame 24, and the stirring motor 25 is connected to the stirring shaft 26 by a coupling, and one end of the stirring shaft 26 is inserted into the slurry temporary storage tank 7, and the end is also provided with a plurality of stirring paddles 27 inserted into the slurry temporary storage tank 7;

[0057] The stirring module can continue to stir the slurry in the slurry temporary storage tank 7 to avoid quality defects caused by insufficient stirring in the mixing box 2. At the same time, during the temporary storage period, the slurry can be prevented from settling through uninterrupted stirring, thereby ensuring the uniformity of the slurry and improving the quality of the slurry.

[0058] Furthermore, a pumping tank 28 is provided on the outer circumference of the slurry temporary storage tank 7, and a plurality of discharge holes 29 are provided on the outer circumference of the slurry temporary storage tank 7, and each of the discharge holes 29 connects the slurry temporary storage tank 7 with the pumping tank 28; a pumping pipe 30 connected to the pumping module 9 is provided in the pumping tank 28;

[0059] The above-mentioned structural setting can separate the extraction pipe 30 from the slurry temporary storage tank 7, which can avoid interference between the extraction pipe 30 and the stirring paddle 27 and other structures, thereby preventing safety accidents from occurring; on the other hand, since the extraction tank 28 is connected to the slurry temporary storage tank 7 through the discharge hole 29, the stirring in the slurry temporary storage tank 7 will also affect the material in the extraction tank 28, thereby ensuring the quality of the extracted slurry;

[0060] When the grouting system described in the present application is in use, workers fill cement, aggregate and other materials into the batching box according to the proportion, and finally control the opening of the connecting pipe through the adjusting plate, and the material enters the powder mixing chamber through the first feeding pipe under the action of its own gravity. In the powder mixing chamber, the first feeding auger will continuously turn the powder through the mixing plate while conveying the material, so as to mix the powder evenly. The powder after stirring and mixing enters the slurry mixing chamber through the feeding port, and after being mixed and stirred with water in the slurry mixing chamber, it is transported to the slurry temporary storage tank through the second feeding auger. While the slurry is continuously stirred and mixed in the slurry temporary storage tank, the pumping module extracts the slurry and transports it to the grouting machine;

[0061] Compared with the prior art, the present invention divides the mixing of slurry into two steps of powder mixing and slurry mixing through the mixing box, and realizes the synchronous stirring and feeding through the setting of the feeding auger and the second feeding auger, and does not need to wait for the stirring to be completed before feeding, thereby realizing the continuous production and uninterrupted supply of slurry, and improving the efficiency of grouting operation;

[0062] Secondly, by adjusting the feeding speed of the feeding auger and the batching box, the slurry production speed of the entire production line can be effectively adjusted to match the grouting speed and avoid excessive slurry; when the slurry demand is large, in addition to increasing the feeding speed and the rotation speed of the feeding auger, the slurry temporary storage tank can also be used to stir the slurry while ensuring the feeding speed. Ensure that the slurry can be evenly mixed and the quality of the slurry is guaranteed, thereby improving the equipment's adaptability to different working conditions.

[0063] Finally, the present application can solve the problem of slow slurry supply speed by segmenting the internal structure of the mixing box. It not only has a simple structure, but also controls the cost of the equipment compared to setting up multiple stirring devices.

[0064] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A high pressure grouting system, characterized in that: It comprises a batching box (1); A mixing box (2), wherein the mixing box (2) is provided with a powder mixing chamber (201) and a slurry mixing chamber (202) separated from each other, the inlet end of the powder mixing chamber (201) is connected to the batching box (1) via a first feeding pipe (3); the powder mixing chamber (201) and the slurry mixing chamber (202) are connected via a feeding port (4); a first feeding auger (5) is provided in the powder mixing chamber, and a second feeding auger is provided in the slurry mixing chamber (202); a water supply module for supplying slurry mixing water is also provided in the slurry mixing chamber (202); A slurry temporary storage tank (7), wherein the inlet end of the slurry temporary storage tank (7) is connected to the slurry mixing chamber (202) via a second feeding pipe (8); a stirring module is also provided on the slurry temporary storage tank (7); A pumping module (9), wherein the pumping module (9) is connected to the slurry temporary storage tank (7), and an outlet end of the pumping module (9) is connected to a grouting machine (10).

2. A high pressure grouting system according to claim 1, characterized in that: The batching box (1) is arranged on the top of the mixing box (2), and a connecting pipe (11) is arranged on the batching box (1), and the connecting pipe (11) is connected to the first feeding pipe (3) through a flange plate (12).

3. A high pressure grouting system according to claim 2, characterized in that: The connecting pipe (11) is provided with a plug-in groove (13), and an adjustment plate (14) for adjusting the on / off state of the connecting pipe (11) is slidably arranged in the plug-in groove (13); a supporting ring (15) adapted to the adjustment plate (14) is also arranged in the connecting pipe (11).

4. A high pressure grouting system according to claim 1, characterized in that: A partition plate (16) is provided in the middle of the mixing box (2), and the partition plate (16) is arranged along the length direction of the mixing box (2). The upper side of the partition plate (16) is a powder mixing chamber (201), and the lower side thereof is a slurry mixing chamber (202); along the feeding direction of the first feeding auger (5), the feeding port (4) is provided at the end of the powder mixing chamber (201).

5. A high pressure grouting system according to claim 1, characterized in that: The conveying direction of the first feeding auger (5) is opposite to the transmission direction of the second feeding auger (6). Along the axial direction of the first feeding auger (5), a plurality of stirring rods (17) are arranged on the first feeding auger (5), and each stirring rod (17) is provided with a mixing plate (18).

6. A high pressure grouting system according to claim 5, characterized in that: A plurality of mixing blades (19) are provided on the second feeding auger (6) along the axial direction of the second feeding auger (6).

7. A high pressure grouting system according to claim 1, characterized in that: The water delivery module comprises a water delivery pump (20) and a water delivery pipe (21) which are connected to each other; a spray pipe (22) is arranged at the top of the slurry mixing chamber (202); the spray pipe (22) is connected to the water delivery pipe (21); and a plurality of spray heads (23) are arranged on the spray pipe (22) along the axial direction of the spray pipe (22).

8. A high pressure grouting system according to claim 7, characterized in that: Along the feeding direction of the second feeding auger (6), the distance between two adjacent spray heads (23) increases linearly, and the unit spray volume of each spray head (23) decreases linearly.

9. A high pressure grouting system according to claim 1, characterized in that: The stirring module comprises a support frame (24), and the support frame (24) is clamped on the top of the slurry temporary storage tank (7); the support frame (24) is provided with a stirring motor (25) and a stirring shaft (26) connected in power, and the stirring shaft (26) is also provided with a plurality of stirring paddles (27) inserted into the slurry temporary storage tank (7).

10. A high pressure grouting system according to claim 9, characterized in that: A pumping tank (28) is also provided on the outer peripheral surface of the slurry temporary storage tank (7), and a plurality of discharge holes (29) are provided on the outer peripheral surface of the slurry temporary storage tank (7), and each of the discharge holes (29) connects the slurry temporary storage tank (7) with the pumping tank (28); a pumping pipe (30) connected to the pumping module (9) is provided in the pumping tank (28).

Images