A pneumatic dual-liquid grouting pump for mining

Abstract

This utility model provides a pneumatic dual-liquid grouting pump for mining, relating to the field of mining grouting pumps. It includes a pneumatic drive component and two working cylinders. The working cylinders are characterized by a cylinder barrel, a plunger rod, a discharge valve seat, and a suction valve seat. The discharge valve seat is vertically connected, connecting a first material chamber and a second material chamber. An upper valve ball is located within the material chamber and can float vertically within the second material chamber. A lower valve ball floats within the suction valve seat and is located above the suction channel. A ring-shaped array of guide holes is also provided on the outer wall of the plunger rod. These guide holes are located above the second material chamber and are arranged obliquely downwards, connecting a third material chamber and the second material chamber. Multiple guide holes converge in the second material chamber directly above the upper valve ball. This utility model, through the provided guide holes, guides the grout during the upward movement of the plunger rod, preventing the upper valve ball from becoming stuck in the second material chamber and thus failing to seal the discharge valve seat, preventing blockage and increasing the flow area.

Description

Technical Field

[0001] This utility model relates to the field of mining grouting pump technology, specifically to a mining pneumatic dual-liquid grouting pump. Background Technology

[0002] In coal mine safety production, it is common practice to pre-drill holes in the coal seam to extract methane gas, reducing its concentration and ensuring that it does not exceed safety limits during mining operations. The drilled holes must be sealed promptly after extraction to prevent residual methane from escaping. Grouting is also used for permanent and temporary closures of roadways and for sealing and filling around goaf areas. Therefore, grouting and sealing is a crucial step in ensuring safe coal mine production.

[0003] Pneumatic grouting pumps are mainly used for the reinforcement of shafts, tunnels, chambers, and surrounding rock, as well as for pre-grouting reinforcement projects, coal mines, well construction, and underground waterproofing projects. They can also be used in various fields such as the construction, repair, and maintenance of underground culverts, water supply pipelines, and gas trenches in urban construction. They are mainly composed of a working cylinder, a pneumatic motor, an air intake system, a grout suction pipe, and a grout discharge system. They use compressed air as power and pressure to accurately inject easily solidified grout into the cracks of rocks or soil to reduce water seepage and consolidate rocks and soil. As disclosed in the patent document with publication number CN202001235U, the existing pneumatic grouting pump works by sealing the plunger valve seat with a discharge steel ball when the plunger rod moves upward, creating a vacuum between the plunger valve seat and the suction valve seat. The suction steel ball then opens, allowing the grout to enter this vacuum zone under atmospheric pressure, thus achieving grout suction. When the piston moves downward, the space between the plunger valve seat and the suction valve seat decreases, increasing the grout pressure. The suction steel ball then seals the suction valve seat, and the discharge steel ball opens, discharging the grout and achieving grout discharge. The plunger rod reciprocates, and the pneumatic grouting pump completes the grout suction and discharge process.

[0004] However, in actual use, especially in underground mining, the pneumatic dual-liquid grouting pumps of the aforementioned technologies may experience a phenomenon where the grout discharge steel ball becomes stuck in the valve seat due to the influence of the grouting liquid. In particular, if the stick gets stuck during the process of the steel ball moving down to block the valve seat, the sealing of the grout discharge steel ball to the valve seat will be affected, thus affecting the smooth discharge of grout.

[0005] Therefore, this application is hereby filed. Utility Model Content

[0006] This invention addresses the aforementioned problems in the prior art by providing a mine pneumatic dual-liquid grouting pump that can effectively solve the problem of the grout discharge valve ball getting stuck during downward movement.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pneumatic double-liquid grouting pump for mining, comprising a pneumatic drive component and two working cylinders, characterized in that the working cylinder includes a cylinder barrel and...

[0008] The plunger rod is movably connected inside the cylinder. The plunger rods of the two working cylinders are fixedly connected to the piston rod of the pneumatic drive unit through the connecting plate. The outer wall of the plunger rod and the inner wall of the cylinder form a third material chamber. A discharge port communicating with the third material chamber is opened on the outer wall of the upper part of the cylinder.

[0009] The discharge valve seat is located inside the cylinder and fixed to the lower part of the plunger rod. The discharge valve seat is sealed to the inner wall of the cylinder. The discharge valve seat is vertically through. The top of the discharge valve seat and the inner wall of the plunger rod form a second material chamber. A material passage hole connecting the second material chamber and the third material chamber is opened on the side wall of the plunger rod.

[0010] The suction valve seat is connected to the bottom of the cylinder. The bottom of the discharge valve seat, the top of the suction valve seat, and the inner wall of the cylinder form a first material chamber. The lower part of the suction valve seat is provided with a suction channel that runs through it, which is used to connect the first material chamber and the suction port at the bottom of the suction valve seat.

[0011] The slurry discharge valve seat is vertically through, used to connect the first material chamber and the second material chamber;

[0012] The upper valve ball is located in the second material chamber and can float up and down in the second material chamber. Its outer diameter is larger than the upper opening diameter of the slurry discharge valve seat.

[0013] The lower valve ball is floatingly installed inside the suction valve seat and located on the upper side of the suction channel, with its outer diameter being larger than the upper opening diameter of the suction channel;

[0014] The plunger rod has a ring-shaped array of guide holes on its outer wall. The guide holes are located on the upper side of the second material chamber. The guide holes are arranged in a downward direction and connect the third material chamber and the second material chamber. Multiple guide holes converge in the second material chamber to the top of the upper valve ball.

[0015] Furthermore, the plunger areas of the two working cylinders are equal, and their reciprocating motion is synchronized, ensuring that the two-component slurry enters the mixing system at the same flow rate and pressure.

[0016] Furthermore, the pneumatic drive component is a pneumatic motor.

[0017] Furthermore, the cylinder is fixed to the housing of the pneumatic drive component via a connecting rod. Specifically, a fixing plate is fixed to the upper part of the cylinder, the fixing plate is fixed to the connecting rod, and the connecting rod is fixed to the housing of the pneumatic drive component.

[0018] The beneficial effects of this utility model are as follows: By setting the guide hole, this utility model guides the slurry during the upward movement of the plunger rod, allowing some of the slurry to flow into the second material chamber directly above the upper valve ball. This flushes the upper valve ball in the second material chamber, preventing it from getting stuck and thus failing to seal the slurry discharge valve seat. It also prevents slurry blockage in the second material chamber and increases the flow area. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of another embodiment of the present invention from another angle;

[0021] Figure 3 This is a partial structural schematic diagram of an embodiment of the present invention;

[0022] Figure 4 This is a partial structural schematic diagram of an embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional structural schematic diagram of an embodiment of the present invention;

[0024] In the diagram: 1. Pneumatic drive component, 2. Working cylinder, 3. Cylinder barrel, 4. Piston rod, 5. Connecting plate, 6. Slurry discharge port, 7. Slurry discharge valve seat, 8. Slurry suction valve seat, 9. Upper valve ball, 10. Lower valve ball, 11. First material chamber, 12. Second material chamber, 13. Third material chamber, 14. Slurry suction port, 15. Suction channel, 16. Through hole, 17. Guide hole, 18. Piston rod, 19. Connecting rod, 20. Fixing plate, 21. Outer shell, 22. Stop bar. Detailed Implementation

[0025] The principles and features of this utility model are described below. The embodiments given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0026] As shown in the attached diagram, the mine pneumatic dual-liquid grouting pump of this embodiment includes a pneumatic drive unit 1 and two working cylinders 2. The pneumatic drive unit 1 is a pneumatic motor, which is connected to an air source through an air inlet pipe. The total air intake and air intake pressure are controlled by an air intake system. The pneumatic motor is a cylinder with an integrated reversing valve, which can realize the reciprocating motion of its piston rod 18 through automatic reversing (this is prior art). The working cylinder 2 includes a cylinder barrel 3, which is fixed to the outer shell 21 of the pneumatic drive unit 1 through a connecting rod 19. A fixing plate 20 is fixed to the upper part of the cylinder barrel 3, and the fixing plate 20 is fixed to the connecting rod 19. The connecting rod 19 is fixed to the outer shell 21 of the pneumatic drive unit 1. The working cylinder also includes

[0027] The plunger rod 4 is movably connected inside the cylinder 3. The plunger rods 4 of the two working cylinders 2 are fixedly connected to the piston rod 18 of the pneumatic drive component 1 through the connecting plate 5. The outer wall of the plunger rod 4 and the inner wall of the cylinder 3 enclose the third material chamber 13. The upper outer wall of the cylinder 3 is provided with a discharge port 6 that communicates with the third material chamber 13.

[0028] The discharge valve seat 7 is located inside the cylinder 3 and fixed to the lower part of the plunger rod 4. The discharge valve seat 7 is sealed to the inner wall of the cylinder 3. The discharge valve seat 7 is vertically through. The top of the discharge valve seat 7 and the inner wall of the plunger rod 4 form a second material chamber 12. A material passage hole 16 is provided on the side wall of the plunger rod 4 to connect the second material chamber 12 and the third material chamber 13.

[0029] The suction valve seat 8 is connected to the bottom of the cylinder 3. The bottom of the discharge valve seat 7, the top of the suction valve seat 8, and the inner wall of the cylinder 3 form a first material chamber 11. The lower part of the suction valve seat 8 is provided with a suction channel 15 that runs through it, which is used to connect the first material chamber 11 and the suction port 14 at the bottom of the suction valve seat 8.

[0030] The discharge valve seat 7 is vertically through-hole, used to connect the first material chamber 11 and the second material chamber 12;

[0031] The upper valve ball 9 is located in the second material chamber 12 and can float up and down in the second material chamber 12. Its outer diameter is larger than the upper opening diameter of the slurry discharge valve seat 7.

[0032] The lower valve ball 10 is floatingly disposed in the suction valve seat 8 and located on the upper side of the suction channel 15. Its outer diameter is larger than the upper opening diameter of the suction channel 15. The upper part of the suction valve seat 8 is provided with a stop bar 22 for limiting the upward floating of the lower valve ball 10.

[0033] The plunger rod 4 is also provided with a ring array of guide holes 17 along its circumference. The guide holes 17 are located on the upper side of the second material chamber 12. The guide holes 17 are arranged in a downward direction and connect the third material chamber 13 and the second material chamber 12. Multiple guide holes 17 converge in the second material chamber 12 to the top of the upper valve ball 9.

[0034] In one embodiment, the two working cylinders have equal plunger areas and move up and down synchronously to ensure that the two-component slurry is discharged at the same flow rate and pressure.

[0035] During operation, when the piston rod 18 of the pneumatic motor drives the plunger rod 4 of the working cylinder to move upward through the connecting plate 5, the upper valve ball seals the upper opening of the discharge valve seat 7, creating a negative pressure between the first material chamber 11 (i.e., the discharge valve seat 7 and the suction valve seat 8), and the lower valve ball opens. Under atmospheric pressure, the slurry enters the negative pressure zone sequentially through the suction port 14 and the suction channel 15, thus achieving slurry suction. When the plunger rod 4 moves downward, the space between the discharge valve seat 7 and the suction valve seat 8 decreases, increasing the slurry pressure. The lower valve ball then seals the upper opening of the suction channel 15 of the suction valve seat 8, closing the suction valve. The upper valve ball opens the suction valve seat 8, and the slurry enters the second material chamber 12 from the first material chamber 11 and then enters the third material chamber 13 through the through hole 16. When the plunger rod 4 moves upward again, the upper valve ball seals the upper opening of the discharge valve seat 7, and the slurry in the third material chamber 13 is discharged through the discharge port 6. At the same time, the lower valve ball opens, and the slurry is sucked through the suction port 14. This process is repeated continuously, involving the suction and discharge of slurry.

[0036] In this embodiment, the specially designed guide hole 17 guides the slurry during the upward movement of the plunger rod 4. Under pressure, some of the slurry enters the second material chamber 12 from the third material chamber 13 through the guide hole 17 and collects directly above the upper valve ball. This flushes the upper valve ball in the second material chamber 12, preventing it from getting stuck and failing to seal the slurry discharge valve seat 7. It also prevents slurry blockage in the second material chamber 12 and increases the flow area.

Claims

1. A pneumatic dual-liquid grouting pump for mining, comprising a pneumatic drive unit (1) and two working cylinders (2), characterized in that, The working cylinder (2) includes a cylinder barrel (3) and The plunger rod (4) is movably connected inside the cylinder (3). The plunger rods (4) of the two working cylinders (2) are fixedly connected to the piston rod (18) of the pneumatic drive component (1) through the connecting plate (5). The outer wall of the plunger rod (4) and the inner wall of the cylinder (3) enclose to form a third material chamber (13). A discharge port (6) communicating with the third material chamber (13) is opened on the outer wall of the upper part of the cylinder (3). The discharge valve seat (7) is located inside the cylinder (3) and fixed to the lower part of the plunger rod (4). The discharge valve seat (7) is sealed to the inner wall of the cylinder (3). The discharge valve seat (7) is vertically connected. The top of the discharge valve seat (7) and the inner wall of the plunger rod (4) form a second material chamber (12). A material passage hole (16) connecting the second material chamber (12) and the third material chamber (13) is opened on the side wall of the plunger rod (4). The suction valve seat (8) is connected to the bottom of the cylinder (3). The bottom of the discharge valve seat (7), the top of the suction valve seat (8), and the inner wall of the cylinder (3) form a first material chamber (11). The lower part of the suction valve seat (8) is provided with a suction channel (15) that runs through it, which is used to connect the first material chamber (11) and the suction port (14) at the bottom of the suction valve seat (8). The discharge valve seat (7) is vertically through and is used to connect the first material chamber (11) and the second material chamber (12). The upper valve ball (9) is located in the second material chamber (12) and can float up and down in the second material chamber (12). Its outer diameter is larger than the upper opening diameter of the discharge valve seat (7). The lower valve ball (10) is floatingly disposed inside the suction valve seat (8) and located on the upper side of the suction channel (15), and its outer diameter is larger than the upper opening diameter of the suction channel (15); The plunger rod (4) is also provided with a ring array of guide holes (17) on its outer wall. The guide holes (17) are located on the upper side of the second material chamber (12). The guide holes (17) are arranged in a downward direction and connect the third material chamber (13) and the second material chamber (12). Multiple guide holes (17) converge in the second material chamber (12) to the top of the upper valve ball (9).

2. The mine pneumatic dual-liquid grouting pump according to claim 1, characterized in that, The plunger areas of the two working cylinders (2) are equal.

3. The mine pneumatic dual-liquid grouting pump according to claim 1, characterized in that, The pneumatic drive component (1) is a pneumatic motor.

4. The mine pneumatic dual-liquid grouting pump according to claim 1, characterized in that, The cylinder (3) is fixed to the outer shell (21) of the pneumatic drive component (1) by a connecting rod (19).

5. The mine pneumatic dual-liquid grouting pump according to claim 4, characterized in that, A fixing plate (20) is fixed on the upper part of the cylinder (3). The fixing plate (20) is fixed to the connecting rod (19), and the connecting rod (19) is fixed to the outer shell (21) of the pneumatic drive component (1).

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