Air inlet valve assembly of pneumatic grouting pump

Abstract

The air inlet valve assembly of the pneumatic grouting pump comprises a valve seat and a valve cover, an impurity discharging connector and an air outlet connector are formed in the side wall of the valve seat, and an air inlet connector is formed in the bottom end of the valve seat; a boss is arranged at the top of the valve seat, an air inlet hole penetrates through the center of the boss and is communicated with the air inlet connector, an impurity discharging hole, an air outlet hole and a plug end are arranged at the top of the boss, the impurity discharging hole is communicated with the impurity discharging opening, and the air outlet hole is communicated with the air outlet connector. A valve cover is rotationally arranged at the top of the valve seat, a connecting hole corresponding to the air inlet hole in position is formed in the center of the valve cover, a butt joint hole is formed in one side of the bottom of the valve cover, an air conveying channel is arranged in the valve cover to connect the butt joint hole and the connecting hole, and by rotating the valve cover, the air inlet hole is communicated with the impurity discharging hole and then communicated with the air outlet hole, so that the effect of firstly discharging impurities and then supplying air is achieved. Impurities in the gas conveying pipeline are effectively discharged in advance; and the floating limiter is arranged in the valve seat, and when water in the pipeline is not completely discharged, the floating ball limiter ascends due to buoyancy to limit the valve cover, so that rotation is limited.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pneumatic valves, in particular to an air inlet valve assembly of a pneumatic grouting pump applied to a coal mine. BACKGROUND

[0002] The pneumatic grouting pump is a device driven by air compression or pneumatic principle, and since the environment in a coal mine is humid, water is contained in the air source, so rust and other impurities exist in part of the metal air conveying pipeline, and the impurities inevitably enter the pneumatic pump along the airflow, causing damage to the pump body. At present, in order to prevent the impurities from entering the pump body, the air pipe connected with the pneumatic pump is removed when the air source is opened, so that the impurities in the pipeline are discharged in advance before the pump body is connected for air supply. In the actual use process, the workers in the coal mine do not operate according to the standard, and the step of discharging the impurities is omitted, so the air source is directly opened, thereby causing the problem that the pneumatic pump is easily damaged. SUMMARY

[0003] The application discloses an air inlet valve assembly of a pneumatic grouting pump, which adopts a manual reversing valve to realize switching, and solves the problem that the impurities in the air source pipeline easily enter the pump body directly along the airflow.

[0004] The specific technical scheme is as follows:

[0005] An air inlet valve assembly of a pneumatic grouting pump is arranged at an air inlet end of the pneumatic grouting pump and comprises a valve seat and a valve cover, a side wall of the valve seat is respectively provided with a discharge interface and an air outlet interface, and an air inlet interface is arranged at a bottom end of the valve seat; a boss is arranged at a top portion of the valve seat, an air inlet hole is longitudinally arranged at a center of the boss, the air inlet hole is in communication with the air inlet interface at a lower end, and a discharge hole, an air outlet hole and a plug end are arranged at the top portion of the boss in a circumferential direction, the discharge hole is in communication with one end of the discharge interface at a lower end, the air outlet hole is in communication with one end of the air outlet interface at a lower end, and the plug end is closed; the valve cover is rotatably arranged at the top portion of the valve seat, and the valve cover and the valve seat are connected through a limiting structure to realize one-way rotation of the valve cover; a connecting hole corresponding to the air inlet hole is arranged at a center of a bottom portion of the valve cover, a butt joint hole is arranged at one side of the bottom portion of the valve cover, and the butt joint hole and the connecting hole are connected through an air conveying channel in the valve cover; the position of the butt joint hole is corresponded to the discharge hole, the air outlet hole and the plug end one by one by rotating the valve cover, the air inlet hole is in communication with the discharge hole and the air outlet hole in sequence, and the plug end is closed to the butt joint hole when the butt joint hole is butted to the plug end.

[0006] The one end of the impurity discharging interface is also provided with a floating limiter, the upper end of the floating limiter penetrates the impurity discharging interface upward and extends to the top of the boss; the bottom end of the valve cover is provided with a clamping groove, when the docking hole is connected with the impurity discharging hole, the position of the clamping groove corresponds to the position of the floating limiter; and when there is water in the air inlet channel, the water generates buoyancy on the floating limiter, pushes the floating limiter to move upward, and makes the floating limiter embed in the clamping groove, so as to limit the rotation of the valve cover.

[0007] When the air supply is stopped, the position of the docking hole of the valve cover corresponds to the position of the plug end, so that the air inlet hole is in a closed state; when the air supply is supplied, the valve cover is rotated in one direction, so that the docking hole is connected with the impurity discharging hole first to discharge water and impurities, if there is still water in the impurity discharging interface, the water generates buoyancy on the floating limiter, makes the floating limiter rise and limits the valve cover, until the water is completely discharged, then the valve cover is rotated again, so that the docking hole is connected with the air outlet hole, so as to achieve the effect of discharging impurities first and then supplying air.

[0008] Preferably, the air inlet hole, the impurity discharging hole, the air outlet hole and the plug end are all circular structures, a ring groove is arranged on the outside of the top of the boss, and a sealing ring is embedded in the ring groove.

[0009] Preferably, the limiting structure comprises a ring groove arranged on the top of the valve seat, a ratchet arranged in the ring groove and an elastic pawl assembly arranged on the edge of the bottom end of the valve cover, the lower end of the elastic pawl assembly is embedded between the ratchets, and the one-way rotation limiting between the valve seat and the valve cover is realized.

[0010] Preferably, the ring groove is located on the outside of the boss, a plurality of ratchets are arranged on the inner wall of the bottom end of the ring groove in the circumferential direction; the edge of the bottom end of the valve cover is provided with a ring-shaped flange which is sleeved on the outside of the boss, at least one mounting groove is arranged on the bottom end of the flange, and an elastic pawl assembly is arranged in the mounting groove, the elastic pawl assembly comprises a pawl and an elastic sheet, the upper end of the pawl is rotatably arranged in the mounting groove through a pin shaft, the top of the pawl is downwardly pressed by the elastic sheet arranged on the top end of the mounting groove, and the lower end of the pawl is obliquely embedded between the two ratchets, so as to play a one-way limiting role.

[0011] Preferably, the boss between the valve cover and the valve seat is provided with a positioning structure, the positioning structure comprises a containing hole arranged on the top of the boss, an elastic positioning steel ball arranged in the containing hole and three positioning holes arranged on the bottom of the valve seat and sequentially matched with the elastic positioning steel ball, when the docking hole is connected with the impurity discharging hole, the air outlet hole and the plug end respectively, the elastic positioning steel ball is embedded in one of the positioning holes to realize positioning.

[0012] Preferably, the elastic positioning steel ball comprises a steel ball arranged in the accommodating hole, a spring for supporting the steel ball and a positioning ring for limiting the edge of the steel ball, so that the steel ball protrudes from the convex surface under the support of the spring and is positioned in cooperation with the positioning hole.

[0013] Preferably, the valve seat is in a rectangular structure, the left and right end sidewalls of the valve seat are symmetrically provided with the impurity discharge interface and the gas outlet interface respectively, and the center of the bottom end of the valve seat is provided with the gas inlet interface, and the outer side of one end of the gas inlet interface, the impurity discharge interface and the gas outlet interface is provided with internal threads.

[0014] Preferably, the gas conveying channel is horizontally arranged, one end and the middle part of the gas conveying channel are communicated with the butt joint hole and the connecting hole respectively, and the other end of the gas conveying channel extends away from the butt joint hole and is closed.

[0015] Preferably, the inner end of the impurity discharge interface is provided with a downwardly recessed groove at the bottom, a movable hole is longitudinally arranged on the inner wall above the groove, the upper end of the movable hole penetrates the convex, and the inner end of the impurity discharge interface is provided with the floating limiter, the floating limiter comprises a floating ball and a limiting pin longitudinally arranged at the top end of the floating ball, the floating ball is located in the groove, and the upper end of the limiting pin is embedded into the movable hole, when there is water in the groove of the impurity discharge interface, the floating ball will float upward and drive the limiting pin to be embedded into the clamping groove at the bottom of the valve cover, so as to realize the rotation limiting of the valve cover.

[0016] Preferably, the bottom end and the two sides of the groove are arc-shaped, and the inner wall of the opening end of the groove close to the impurity discharge interface is inclined, so as to facilitate the discharge of liquid under the action of gas flow.

[0017] Preferably, the edge of the bottom end of the clamping groove and the edge of the top end of the limiting pin are chamfered respectively.

[0018] Preferably, the top of the valve cover is provided with a handle.

[0019] The beneficial effects of the present application are embodied in:

[0020] (1) The manual reversing valve of the present application is arranged on the gas conveying pipeline, when starting to supply gas, the gas inlet hole is first communicated with the impurity discharge hole and then communicated with the gas outlet hole by rotating the valve cover, so as to achieve the effect of discharging impurities first and then supplying gas, effectively discharging the impurities in the gas conveying pipeline in advance, greatly reducing the probability of impurities entering the pump body, thereby improving the service life of the pneumatic grouting pump.

[0021] (2) In the present application, the floating limiter is arranged in the valve seat, when the water in the valve seat is not completely discharged, the floating ball limiter will limit the valve cover under the action of buoyancy, thereby limiting its rotation, effectively avoiding the problem that the water in the pipeline is not completely discharged due to the too fast rotation of the valve cover by manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure is a structure diagram of the air inlet valve assembly of the present application.

[0023] Figure 2 The figure is a structure diagram of the bottom structure of the air inlet valve assembly of the present application.

[0024] Figure 3 The figure is a perspective view of the valve seat of the present application.

[0025] Figure 4 The figure is a top view of the valve seat of the present application.

[0026] Figure 5 The figure is a front sectional view of the air inlet valve assembly of the present application.

[0027] Figure 6 The figure is a side sectional view of the air inlet valve assembly of the present application.

[0028] Figure 7 The figure is a structure diagram of the valve cover of the present application.

[0029] Figure 8 The figure is a partial diagram of the limiting structure of the present application.

[0030] Figure 9 The figure is a perspective view of the valve seat after the seal ring is removed of the present application.

[0031] Explanation of the reference signs: valve seat 1, impurity discharge interface 11, gas outlet interface 12, air inlet interface 13, recess 14, movable hole 15, ring groove 16, ratchet 17;

[0032] boss 2, air inlet hole 21, impurity discharge hole 22, gas outlet hole 23, plug end 24, embedding groove 25, seal ring 26, containing hole 27, elastic positioning steel ball 28, rotating groove 29;

[0033] valve cover 3, connecting hole 31, butt joint hole 32, gas conveying passage 33, clamping groove 34, positioning hole 35, handle 36, blocking edge 37, installation groove 371, convex strip 372, ratchet pawl 38, elastic sheet 39;

[0034] floating limiter 4, floating ball 41, limiting pin 42. DETAILED DESCRIPTION

[0035] In order to make the technical solutions of the present application more clear and explicit, the present application is further described below in combination with the drawings. Any solutions obtained by equivalent replacement and common reasoning of the technical features of the technical solutions of the present application all fall into the protection scope of the present application. The fixed connection and fixed setting mentioned in the present application are all common connection modes in the mechanical field, and welding, bolt and nut connection and screw connection are all available.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element 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 this invention.

[0037] Please see the appendix Figures 1-4 This embodiment provides an air inlet valve assembly for a pneumatic grouting pump, which is disposed between the air inlet end of the pneumatic grouting pump and the air supply pipeline. It includes a valve seat 1 and a valve cover 3. The valve seat sidewall is provided with a discharge port 11 and an air outlet port 12, respectively. The bottom end of the valve seat is provided with an air inlet port 13. The top of the valve seat is provided with a boss, and the boss 12 has a longitudinally penetrating air inlet hole 21. The lower end of the air inlet hole 21 is connected to the air inlet port. The top of the boss is provided with a discharge port 22, an air outlet hole 23 and a plug end 24 evenly distributed around the circumference. The lower end of the discharge port is connected to one end of the discharge port, the lower end of the air outlet hole 23 is connected to one end of the air outlet port, and the plug end 24 is closed and used to close the air supply pipeline.

[0038] like Figures 5-7 As shown, a valve cover 3 is rotatably mounted on the top of the valve seat 1. A handle 36 is located on the top of the valve cover. A limiting structure allows for unidirectional rotation of the valve cover 3 between its bottom and the top of the valve seat 1. A connecting hole 31, corresponding to the position of the air inlet 21, is located at the center of the bottom of the valve cover. A docking hole 32 is located on one side of the bottom of the valve cover. A horizontal air supply channel 33 is located inside the valve cover. One end and the middle portion of the air supply channel are connected to the docking hole and the connecting hole, respectively. The other end of the air supply channel extends away from the docking hole 32 and is closed, forming a chamber to contain liquid. By rotating the valve cover 3, the position of the docking hole 32 corresponds to the drain hole 22, the air outlet 23, and the plug end 24, respectively. The air inlet 21 is connected to the drain hole 22 and the air outlet 23 in sequence. When the docking hole is aligned with the plug end, the plug end 24 closes the docking hole 32.

[0039] A floating limiter 4 is also provided at one end of the discharge port 11. The upper end of the floating limiter passes through the discharge port 11 and extends to the top of the boss 12. A circular groove 34 is provided at one end of the bottom of the valve cover 3. When the docking hole 32 is connected to the discharge hole 22, the position of the groove 34 corresponds to the position of the floating limiter. When there is water in the air intake channel, the water generates buoyancy on the floating limiter 4, pushing the floating limiter 4 to move upward and embed it into the groove 34, thereby limiting the rotation of the valve cover 3.

[0040] When the gas supply is stopped, the position of the valve cover's mating hole 32 corresponds to the position of the plug end 24, so that the air inlet 21 is in a closed state. When the gas supply is started, the valve cover 3 is rotated in one direction, so that the mating hole 32 first connects with the drain hole 22 to drain water and remove impurities. If there is still water in the drain port 11, the water will generate buoyancy on the floating limiter 4, causing it to rise and limit the valve cover until the water is completely drained. Then the valve cover 3 is rotated again, so that the mating hole 32 connects with the air outlet 23, thereby achieving the effect of draining impurities first and then supplying gas.

[0041] like Figure 5 As shown, in this embodiment, a downwardly recessed groove 14 is provided at one end of the drain port 11. A movable hole 15 is longitudinally opened on the inner wall of the drain port 11 above the groove 14. The upper end of the movable hole 15 passes through the boss 12, and a floating limiter 4 is provided at one end of the drain port 11. The floating limiter 4 includes a float 41 and a limiting pin 42 longitudinally arranged at the top of the float 41. The float 41 is located in the groove 14, and the upper end of the limiting pin is embedded upward into the movable hole 15. When the docking hole 32 is connected to the drain hole 22, the position of the positioning pin corresponds to the position of the slot 34. Therefore, when there is water in the groove 14 of the drain port 11, the float 41 will float upward and drive the limiting pin 42 to be embedded upward into the slot 34 at the bottom of the valve cover 3, thereby realizing the rotational limitation of the valve cover 3.

[0042] In this embodiment, the bottom and both sides of the groove 14 are arc-shaped, and the inner wall of the groove 14 near the opening of the discharge port 11 is inclined, which facilitates the discharge of liquid under the action of airflow.

[0043] In this embodiment, the bottom edge of the slot 34 and the top edge of the positioning pin are chamfered to facilitate the positioning pin being smoothly inserted into the slot 34.

[0044] like Figures 8-9 As shown, in this embodiment, the limiting structure includes an annular groove 16 on the top of the valve seat 1, ratchet teeth 17 in the annular groove 16, and an elastic pawl assembly on the bottom edge of the valve cover 3. The lower end of the elastic pawl assembly is embedded between the ratchet teeth 17 to achieve unidirectional rotational limiting between the valve seat 1 and the valve cover 3. The annular groove 16 is located outside the boss 12, and several ratchet teeth 17 are arranged circumferentially on the inner wall of the bottom end of the annular groove. The bottom edge of the valve cover 3 is provided with a retaining edge 37 fitted around the outside of the boss 12. The bottom end of the retaining edge 37 has at least one mounting groove 371 and an elastic pawl assembly is installed thereon. The elastic pawl assembly includes a pawl 38 and a spring piece 39. The upper end of the pawl is rotatably mounted in the mounting groove 371 by a pin, and the top of the pawl is pressed downward by the spring piece 39 mounted at the top of the mounting groove 371, so that the lower end of the pawl 38 is inclined and embedded between two of the ratchet teeth 17, thereby achieving unidirectional limiting.

[0045] A rotating groove 29 is horizontally formed on the side wall of the boss 12, and a convex strip 372 is formed on the inner wall of the retaining edge 37 and matches the rotating groove 29. The convex strip 372 is embedded into the rotating groove 29 to achieve the rotating connection between the valve cover 3 and the valve seat 1.

[0046] In the embodiment, the positioning structure is arranged between the valve cover 3 and the boss 12 of the valve seat 1. The positioning structure comprises a containing hole 27 arranged on the top of the boss 12, an elastic positioning steel ball 28 arranged in the containing hole 27, and three positioning holes 35 arranged on the bottom of the valve seat 1 and sequentially matched with the elastic positioning steel ball 28. When the butt joint holes 32 are respectively butt jointed with the impurity discharge hole 22, the gas outlet hole 23 and the plug end 24, the elastic positioning steel ball 28 is embedded into one of the positioning holes 35 to achieve the positioning. The elastic positioning steel ball 28 comprises a steel ball arranged in the containing hole 27, a spring for supporting the steel ball, and a positioning ring for limiting the edge of the steel ball, so that the steel ball is protruded from the surface of the boss 12 under the support of the spring and matched with the positioning hole 35 to achieve the positioning.

[0047] As shown in the figure, Figure 9 In the embodiment, the air inlet hole 21, the impurity discharge hole 22, the gas outlet hole 23 and the plug end 24 are all circular structures. A set of embedding grooves 25 are arranged on the top of the boss 12 outside the air inlet hole, the impurity discharge hole, the gas outlet hole and the plug end. The sealing rings 26 are embedded in the embedding grooves 25. The upper ends of the sealing rings are protruded from the embedding grooves 25 and tightly combined with the bottom of the valve cover to ensure the sealing effect of the butt joint between the holes.

[0048] In the embodiment, the valve seat is a rectangular structure. The impurity discharge interface 11 and the gas outlet interface 12 are symmetrically arranged on the side walls of the left and right ends of the valve seat 1. The air inlet interface 13 is arranged at the center of the bottom of the valve seat. The outer sides of the air inlet interface 13, the impurity discharge interface 11 and the gas outlet interface 12 are all provided with internal threads.

[0049] The working principle of the application is as follows: in the initial stage, after the air source is opened, the liquid in the gas supply pipeline fills in the gas conveying channel 33. When the gas supply starts, the rotating valve cover makes the butt joint hole 32 butt jointed with the impurity discharge hole 22 first. At this time, the impurity discharge interface is communicated with the air inlet interface. Because the pressure in the gas conveying channel cavity is greater than the pressure at the impurity discharge interface, the liquid in the gas conveying channel cavity and the liquid at the air inlet interface will flow out of the impurity discharge interface together, so as to realize the discharge of the water and impurities in the gas supply pipeline. Then, the valve cover is continuously rotated to make the butt joint hole 32 butt jointed with the gas outlet hole 23 again, so as to realize the communication between the air source and the pump body, thereby achieving the effect of discharging the impurities in the gas supply pipeline in advance. After the gas supply is completed, the handle 36 is continuously rotated in one direction to make the butt joint hole butt jointed with the plug end 24, so as to complete the sealing of the air inlet pipeline.

[0050] When the water in the air supply pipeline is not completely drained, the water in the pipeline is concentrated in the groove 14 of the impurity discharge interface 11, and the floating ball 41 located in the groove 14 rises under the action of buoyancy, thereby rising through the limiting pin 42 and being embedded in the clamping groove 34 of the valve cover 3 to achieve limiting. When the water in the impurity discharge channel groove 14 is completely drained, the floating limiter falls under the action of gravity and no longer limits the valve cover 3. At this time, the handle 36 can be rotated for normal air supply.

[0051] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gas injection valve assembly of a pneumatic grouting pump, which is provided at a gas injection end of the pneumatic grouting pump, characterized in that, The valve seat, the valve cover, the valve seat side wall is respectively provided with the impurity discharge interface and the gas outlet, the valve seat bottom end is provided with the gas inlet; the valve seat top is equipped with the boss, the boss center is longitudinally provided with the gas inlet hole, the gas inlet hole lower end is communicated with the gas inlet, the boss top is provided with the impurity hole, the gas outlet and the plug end along the circumferential direction, the impurity hole lower end is communicated with one end of the impurity discharge, the gas outlet lower end is communicated with one end of the gas outlet, the plug end is closed; the valve seat top is rotatably provided with the valve cover, and the valve cover and the valve seat are connected by the limiting structure to realize the one-way rotation of the valve cover; the valve cover bottom center is provided with the connecting hole corresponding to the position of the gas inlet hole, one side of the valve cover bottom is provided with the butt joint hole, and the valve cover is connected with the butt joint hole and the connecting hole through the gas inlet channel; by rotating the valve cover, the position of the butt joint hole is corresponding to the impurity hole, the gas outlet and the plug end one by one, and the gas inlet hole is communicated with the impurity hole, the gas outlet in turn, when the butt joint hole is connected with the plug end, the plug end is closed to the butt joint hole. The one end of the impurity discharge interface is also provided with a floating limiter, the upper end of the floating limiter penetrates the impurity discharge interface and extends to the top of the boss; one end of the valve cover bottom is provided with a clamping groove, when the butt joint hole is connected with the impurity hole, the position of the clamping groove corresponds to the position of the floating limiter; and when there is water in the gas inlet channel, the water generates buoyancy on the floating limiter, pushes the floating limiter to move upward, so that it is embedded in the clamping groove, thereby limiting the rotation of the valve cover.

2. An air inlet valve assembly for an air- operated grout pump as claimed in claim 1, wherein, The gas inlet hole, the impurity hole, the gas outlet and the plug end are all circular structures, a ring groove is arranged on the outside of the boss top of the gas inlet hole, the impurity hole, the gas outlet and the plug end, a sealing ring is embedded in the ring groove, and the upper end of the sealing ring is tightly combined with the bottom of the valve cover.

3. An air inlet valve assembly for an air- operated grout pump as defined in claim 1, wherein: The limiting structure includes a ring groove arranged on the top of the valve seat, a ratchet arranged in the ring groove, and a flexible pawl assembly arranged on the edge of the bottom of the valve cover, the lower end of the flexible pawl assembly is embedded between the ratchets, and the one-way rotation limiting between the valve seat and the valve cover is realized.

4. An air entry valve assembly for an air operated grout pump as claimed in claim 3 wherein, The ring groove is located on the outside of the boss, a plurality of ratchets are arranged on the inner wall of the bottom of the ring groove in the circumferential direction; a ring of the flange is arranged on the outside of the boss, at least one mounting groove is arranged on the bottom end of the flange, and the flexible pawl assembly is arranged in the mounting groove, the flexible pawl assembly includes a pawl and a spring piece, the upper end of the pawl is rotatably arranged in the mounting groove through a pin shaft, the top of the pawl is downwardly pressed by the spring piece arranged on the top end of the mounting groove, so that the lower end of the pawl is obliquely embedded between the two ratchets, thereby achieving the function of one-way limiting.

5. An air entry valve assembly for an air operated grout pump as claimed in claim 1 wherein, The valve cover and the boss of the valve seat are provided with a positioning structure, the positioning structure includes a containing hole arranged on the top of the boss, a flexible positioning steel ball arranged in the containing hole, and three positioning holes arranged on the bottom of the valve seat and sequentially matched with the flexible positioning steel ball, when the butt joint hole is connected with the impurity hole, the gas outlet and the plug end respectively, the flexible positioning steel ball is upwardly embedded in one of the positioning holes to realize positioning.

6. An air entry valve assembly for an air operated grout pump as claimed in claim 5 wherein, The elastic positioning steel ball includes a steel ball disposed in a receiving hole, a spring for supporting the steel ball, and a positioning ring for limiting the edge of the steel ball, so that the steel ball protrudes from the surface of the boss under the support of the spring and cooperates with the positioning hole to achieve positioning.

7. An air-entraining valve assembly for a pneumatic grout pump as defined in claim 1, wherein, The valve seat has a rectangular structure, with the discharge port and the air outlet port symmetrically opened on the left and right side walls respectively, and the air inlet port is opened at the center of the bottom end of the valve seat. The outer ends of the air inlet port, the discharge port, and the air outlet port are all provided with internal threads.

8. An air entry valve assembly for an air operated grout pump as claimed in claim 7, wherein, The bottom of one end of the discharge port is provided with a downwardly recessed groove. The inner wall of the discharge port above the groove has a longitudinally extending movable hole. The upper end of the movable hole passes through a boss, and the floating limiter is provided at one end of the discharge port. The floating limiter includes a float and a limiting pin longitudinally arranged at the top of the float. The float is located in the groove, and the upper end of the limiting pin is inserted upward into the movable hole. When there is water in the groove of the discharge port, the float will float upward and drive the limiting pin to be inserted upward into the slot at the bottom of the valve cover, thereby realizing the rotation limit of the valve cover.

9. An air entry valve assembly for an air operated grout pump as claimed in claim 8, wherein, The bottom and both sides of the groove are arc-shaped, and the inner wall of the groove near the opening of the waste discharge interface is sloping.

10. An air entry valve assembly for an air operated grout pump as claimed in claim 1 wherein, The gas transmission channel is horizontally arranged, with one end and the middle part of the gas transmission channel connected to the docking hole and the connecting hole, respectively, and the other end of the gas transmission channel extends away from the docking hole and is closed.

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