A mining water cutting machine

Abstract

This invention provides a water-cooled cutting machine for mining, belonging to the technical field of cutting machines. It solves the technical problems of unstable pressure in existing water-cooled cutting machines for mining. This water-cooled cutting machine for mining includes a chassis, within which an abrasive tank, a hydraulic booster pump, and an accumulator fixedly connected are mounted. A three-way valve is fixedly connected to the outside of the chassis, connecting an external inlet pipe, a normal pressure outlet pipe, and a low-pressure outlet pipe. The accumulator is fixedly connected to a connecting valve, which has interconnected connecting holes one, two, three, four, and five. The accumulator is connected to connecting hole one, and the normal pressure outlet pipe is connected to connecting hole two. The hydraulic booster pump has a booster inlet and a booster outlet. The low-pressure outlet pipe is connected to the booster inlet, and the booster outlet is connected to connecting hole three via an adjusting device. Connecting hole four is connected to the high-pressure inlet of the abrasive tank, and connecting hole five is connected to a pressure gauge. This invention maintains a relatively stable pressure entering the abrasive tank.

Description

Technical Field

[0001] This invention relates to the field of cutting machine technology, specifically a water-cooled cutting machine for mining. Background Technology

[0002] The main components of a waterjet cutting machine for mining include an abrasive tank, a mixing valve, a pressure compensation device, a hydraulic control valve with underpressure protection and overpressure alarm, a check valve, a shut-off valve, a safety valve, a high-pressure hose, a pressure gauge, and a nozzle. Its features include low operating pressure, hydraulic drive without power supply, and direct connection to emulsion pumps and coal seam water injection pumps in coal mines. The machine is small in size, lightweight, easy to move, flexible, and convenient to operate. The waterjet cutting machine mixes high-pressure water and abrasive in a specific ratio, which is then piped to the cutting nozzle to generate a high-speed water jet, cutting the workpiece into any shape. The water pressure during the cutting process is 30-45 MPa, more than 10 times lower than the 400 MPa required by traditional equipment. Waterjet cutting machines offer advantages such as low energy consumption, small size, easy mobility, and long service life.

[0003] For example, the prior art patent number 2020108063625, entitled "Pressurized Compensating Premixed Waterjet Cutting Machine for Coal Mines," discloses that when the pressure of the liquid supplied at the inlet experiences negative pressure pulse fluctuations, the liquid stored in the pressure compensator is replenished to the system through the pressure compensator's diversion valve. Under the action of the one-way valve, the replenished liquid will not flow back and can only replenish and pressurize the abrasive generator, maintaining the system pressure and ensuring the normal operation of the premixed premixed waterjet cutting machine for coal mines.

[0004] However, underground in mines, a long pipeline connection is required between the pump station and the cutting machine. Furthermore, the pump station has multiple applications for fluid supply, not just for the cutting machine. Therefore, the power supply often experiences fluctuations, and when the supplied pressure drops below 22 MPa, the cutting machine's normal operation is affected. To ensure the cutting machine can operate normally when the power supply is below 22 MPa, existing patent number 2022108323725, entitled "A Mining Water Cutting Device with Built-in Hydraulic Booster Pump," discloses a process where low-pressure water enters a built-in booster pump through an inlet pipe switch, inlet pipe, reversing valve, booster pump inlet pipe, booster pump inlet pressure gauge, and booster pump valve block. The built-in booster pump pressurizes the inlet water at a 1:2 ratio. The pressurized water is then supplied to the pressure compensator and sand storage tank via a high-pressure outlet pipe and a supply pressure compensator valve block. The sand and water mix in the sand storage tank and then flow out through the mixing valve outlet, thus functioning as a mining water cutting device with a built-in hydraulic booster pump.

[0005] While pressure boosters can handle fluctuations in the hydraulic system, they rely on a stable external high-pressure hydraulic source, which is difficult to achieve. Therefore, combining a pressure booster with a built-in hydraulic booster pump creates a mine-use waterjet cutting device with an internal hydraulic booster pump, providing an active booster power source. However, there is a delay between the booster pump's output pressure and the pressure booster's response, especially during pump reversals or sudden load changes, causing instantaneous pulsations in the cutting pressure and affecting cutting efficiency. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a water cutting machine for mining.

[0007] The objective of this invention can be achieved through the following technical solution: A mining water cutting machine includes a chassis, in which an abrasive tank, a hydraulic booster pump, and an accumulator fixedly connected are fixedly connected. A three-way valve is fixedly connected to the outside of the chassis, and the three-way valve is connected to an external inlet pipe, a normal pressure outlet pipe, and a low pressure outlet pipe. The accumulator is fixedly connected to a connecting valve, which has interconnected connecting holes one, two, three, four, and five. The accumulator is connected to connecting hole one, and the normal pressure outlet pipe is connected to connecting hole two. The hydraulic booster pump has a booster inlet and a booster outlet. The low pressure outlet pipe is connected to the booster inlet. The booster outlet is connected to connecting hole three via an adjusting device. Connecting hole four is connected to the high-pressure inlet of the abrasive tank, and connecting hole five is connected to a pressure gauge.

[0008] The preferred three-way valve in this design is a three-way directional valve connected to a pressure gauge. The power source is an underground emulsion pump station in the coal mine. When the inlet pressure is greater than 22 MPa, the three-way valve opens, connecting the atmospheric pressure outlet pipe to the external inlet pipe. The atmospheric pressure outlet pipe then connects to the second connection port, allowing the high-pressure liquid to enter the connecting valve and subsequently the accumulator and abrasive tank. When the inlet pressure is less than 22 MPa, the three-way valve opens, connecting the low-pressure outlet pipe to the external inlet pipe. The low-pressure outlet pipe then connects to the booster inlet, increasing the pressure by a 1:2 ratio via a hydraulic booster pump. The pressure at the booster outlet is then absorbed and stabilized by a regulating device before connecting to the third connection port, transforming the unstable external liquid into a stable high-pressure liquid that enters the accumulator and abrasive tank. The regulating device absorbs and suppresses pressure fluctuations and pulsations at the output of the hydraulic booster pump. Before the pressurized high-pressure liquid enters the main circuit of the connecting valve, it is damped and buffered. This significantly reduces the impact of pressure fluctuations caused by the operation of the hydraulic booster pump itself on the final cutting pressure. Ensure that the pressure entering the abrasive tank remains relatively stable even when the hydraulic booster pump is reversing.

[0009] In the aforementioned water-cooled cutting machine for mining, the adjusting device includes an adjusting base, which is provided with an adjusting inlet, an adjusting outlet, a first adjusting chamber, and a second adjusting chamber. The adjusting inlet and the pressurized outlet are connected, and the adjusting outlet and the connecting hole are connected. The first adjusting chamber is provided with a first adjusting component, and the second adjusting chamber is provided with a second adjusting component. The adjusting inlet and the first adjusting chamber are connected or disconnected through the first adjusting component. The adjusting outlet is directly connected to the first adjusting chamber. The first adjusting chamber and the second adjusting chamber are connected or disconnected through the cooperation of the first adjusting component and the second adjusting component. The second adjusting chamber and the adjusting inlet are directly connected through a second connecting hole.

[0010] In the above-mentioned water-cooled cutting machine for mining, the first adjusting component includes a first adjusting piston, a first sealing seat, and a first sealing cover. A first adjusting spring is provided between the first sealing cover and the first adjusting piston, and the first adjusting piston slides in a sealed manner within the first adjusting cavity.

[0011] In the aforementioned water-cooled cutting machine for mining, the first adjusting piston sequentially includes a guide part, a sealing part one, and a sealing part two. The diameter of the sealing part one is larger than that of the guide part and the sealing part two. The first sealing seat has a first through hole. The sealing part two cooperates with the first sealing seat to abut against or seal the first through hole. The first sealing cover is provided with a guide hole. The guide part cooperates with the guide hole. A first connecting hole is provided between the first adjusting cavity and the second adjusting cavity. The sealing part one slides upward to connect the first connecting hole and the adjusting outlet. The sealing part one slides downward to separate the first connecting hole from the adjusting outlet.

[0012] In the above-mentioned water-cooled cutting machine for mining, the second adjustment component includes a second sealing seat and a second sealing cover, and a sealing ball and a second adjustment spring that allows the sealing ball to abut against or move away from the second sealing seat are provided between the second sealing seat and the second sealing cover.

[0013] In the aforementioned water-cooled cutting machine for mining, the abrasive tank is fixedly connected to a mixing valve seat. The mixing valve seat has a through-cavity and a vertically connected inlet and outlet port. A mixing nozzle is fixedly connected to the installation cavity. The outer periphery of the mixing nozzle has two sealing grooves that mate with the installation cavity. A liquid passage groove is located between the sealing grooves. The mixing nozzle has a straight inlet channel. The inlet port is located between the two sealing grooves and communicates with the inlet channel through the liquid passage groove. A sand measuring piston is also slidably installed in the installation cavity. The sand measuring piston has a mixing channel communicating with the inlet channel. The sand measuring piston controls the opening and closing of the mixing channel and the outlet port.

[0014] In the above-mentioned water-cooled cutting machine for mining, a valve core is fixedly installed at the end of the mixing nozzle near the sand measuring piston, and a piston alloy is fixedly installed at the end of the sand measuring piston near the mixing nozzle. The inner circumferential surface of the piston alloy abuts against or moves away from the outer circumference of the valve core to control the opening and closing of the mixing channel and the liquid outlet.

[0015] In the above-mentioned mining water cutting machine, the mixing nozzle has an L-shaped groove on the outer periphery of one end of the valve core, the piston alloy and the liquid outlet are arranged opposite to each other and always have a notch, and the notch is always connected to the L-shaped groove.

[0016] In the above-mentioned mining water cutting machine, the valve core has a through hole, which is always connected to the liquid inlet channel and the mixing channel.

[0017] In the above-mentioned mining water cutting machine, a second seal and a third seal are provided between the sand measuring piston and the mounting cavity. A liquid replenishment groove is provided on the outer periphery of the sand measuring piston. The liquid replenishment groove is located between the second seal and the third seal. The liquid replenishment groove is connected to the liquid inlet channel through a liquid replenishment hole.

[0018] Compared with existing technologies, the technical advantages of this invention are as follows: The regulating device stabilizes the pulsating pressure output from the hydraulic booster pump within a range of ±5MPa before delivering it to the connecting valve via connection hole three. This breaks through the rigid dependence of traditional waterjet cutting machines on a stable high-pressure source, enabling the equipment to continuously output stable cutting pressure under drastically fluctuating mine fluid supply conditions. The connecting valve operates via a direct supply path: when the external pressure is ≥22MPa, the high-pressure fluid from the atmospheric pressure outlet pipe flows directly to the accumulator and abrasive tank via connection hole two; and a booster path: when the pressure is <22MPa, the boosted and stabilized fluid is injected into the system via connection hole three. The dual paths achieve pressure self-balancing within the valve body, improving working efficiency. Attached Figure Description

[0019] Figure 1 This is the three-dimensional representation of the present invention. Figure 1 .

[0020] Figure 2 This is the three-dimensional representation of the present invention. Figure 2 .

[0021] Figure 3 This is a cross-sectional view of the present invention.

[0022] Figure 4 This is a cross-sectional view of the connecting valve of the present invention.

[0023] Figure 5 This is a perspective view of the hydraulic booster pump and regulating device of the present invention.

[0024] Figure 6 This is a cross-sectional view of the adjusting device of the present invention.

[0025] Figure 7 This is a cross-sectional view of the abrasive tank and sand discharge device of the present invention.

[0026] Figure 8 This is an enlarged view of A of the present invention.

[0027] Drawing number markings: 1. Chassis; 2. Abrasive jar; 3. Hydraulic booster pump; 301. Booster inlet; 302. Booster outlet; 4. Accumulator; 5. Three-way valve; 6. External inlet pipe; 7. Atmospheric pressure outlet pipe; 8. Low pressure outlet pipe; 9. Connecting valve; 901. Connection hole one; 902. Connection hole two; 903. Connection hole three; 904. Connection hole four; 905. Connection hole five; 10. Adjusting seat; 101. Adjusting inlet; 102. Adjusting outlet; 103. First adjusting chamber; 104. Second adjusting chamber; 105. First connecting hole; 106. Second connecting hole; 11. Pressure gauge; 12. First adjusting assembly; 121. First adjusting piston; 1211. Guide part; 1212. Sealing part one; 1213. Sealing part two; 12 2. First sealing seat; 1221. First through hole; 123. First sealing cover; 1231. Guide hole; 124. First adjusting spring; 13. Second adjusting assembly; 131. Second sealing seat; 132. Second sealing cover; 133. Sealing ball; 134. Second adjusting spring; 14. Mixing valve seat; 141. Mounting cavity; 142. Liquid inlet hole; 143. Liquid outlet hole; 144. Liquid replenishment hole; 15. Mixing nozzle; 151. Sealing groove one; 152. Liquid passage groove one; 153. Liquid inlet channel; 154. L-shaped groove; 155. Notch; 16. Measuring piston; 161. Mixing channel; 162. Liquid replenishment groove; 17. Valve core; 171. Straight through hole; 18. Piston alloy; 19. Sealing component two; 20. Sealing component three; 21. Sealing component one. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] It should be noted that the descriptions of directions such as "upper", "lower", "left", "right", "top", and "bottom" in this invention are defined 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 are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] according to Figures 1 to 8As shown: A water-cooled cutting machine for mining includes a casing 1. An abrasive tank 2, a hydraulic booster pump 3, and an accumulator 4 fixedly connected inside the casing 1 are also included. A three-way valve 5 is fixedly connected outside the casing 1. The three-way valve 5 is connected to an external inlet pipe 6, a normal pressure outlet pipe 7, and a low pressure outlet pipe 8. The accumulator 4 is fixedly connected to a connecting valve 9, which has interconnected connecting holes 901, 902, 903, and 904. The accumulator 4 is connected to the connection hole 1 (901), and the atmospheric pressure outlet pipe 7 is connected to the connection hole 2 (902). The hydraulic booster pump 3 has a booster inlet 301 and a booster outlet 302. The low-pressure outlet pipe 8 is connected to the booster inlet 301. The booster outlet 302 is connected to the connection hole 3 (903) through an adjusting device. The connection hole 4 (904) is connected to the high-pressure inlet of the abrasive tank 2. The connection hole 5 (905) is connected to a pressure gauge 11. The three-way valve 5 is preferably a three-way reversing valve and is connected to a pressure display gauge. The power source is an underground emulsion pump station in a coal mine. When the inlet pressure is greater than 22 MPa, the three-way valve 5 opens, and the atmospheric pressure outlet pipe 7 is connected to the external inlet pipe 6. The atmospheric pressure outlet pipe 7 is connected to the connection hole 2 (902) to allow the high-pressure liquid to enter the connecting valve 9 and then into the accumulator 4 and the abrasive tank 2. When the inlet pressure is less than 22 MPa, the three-way valve 5 opens, connecting the low-pressure outlet pipe 8 to the external inlet pipe 6. The low-pressure outlet pipe 8 then connects to the booster inlet 301. The hydraulic booster pump 3 increases the pressure at a 1:2 ratio, and the pressure at the booster outlet 302 is absorbed and stabilized by the regulating device before connecting to the connecting hole 903. This transforms the unstable external liquid into a stable high-pressure liquid that enters the accumulator 4 and the abrasive tank 2. The regulating device absorbs and suppresses pressure fluctuations and pulsations at the output of the hydraulic booster pump 3. Before the pressurized high-pressure liquid flows into the main circuit of the connecting valve 9, it dampens and buffers the flow. This significantly reduces the impact of pressure fluctuations caused by the operation of the hydraulic booster pump 3 on the final cutting pressure. It ensures that even when the hydraulic booster pump 3 reverses direction, the pressure entering the abrasive tank 2 remains relatively stable.

[0031] The regulating device includes an regulating seat 10, on which are provided a regulating inlet 101, a regulating outlet 102, a first regulating chamber 103, and a second regulating chamber 104. The regulating inlet 101 is connected to the pressurized outlet 302, and the regulating outlet 102 is connected to the connecting hole 903. The first regulating chamber 103 is provided with a first regulating component 12, and the second regulating chamber 104 is provided with a second regulating component 13. The regulating inlet 101 and the first regulating chamber 103 are connected or disconnected through the first regulating component 12. The regulating outlet 102 is directly connected to the first regulating chamber 103. The first regulating chamber 103 and the second regulating chamber 104 are connected or disconnected through the first regulating component 12 and the second regulating component 13. The second regulating chamber 104 and the regulating inlet 101 are directly connected through the second connecting hole 106. The first adjustment assembly 12 includes a first adjustment piston 121, a first sealing seat 122 and a first sealing cover 123. A first adjustment spring 124 is provided between the first sealing cover 123 and the first adjustment piston 121. The first adjustment piston 121 slides in a sealed manner within the first adjustment cavity 103. The first adjusting piston 121 includes a guide portion 1211, a first sealing portion 1212, and a second sealing portion 1213. The diameter of the first sealing portion 1212 is larger than that of the guide portion 1211 and the second sealing portion 1213. The first sealing seat 122 has a first through hole 1221. The second sealing portion 1213 cooperates with the first sealing seat 122 to abut against or seal the first through hole 1221. The first sealing cover 123 is provided with a guide hole 1231. The guide portion 1211 cooperates with the guide hole 1231. A first connecting hole 105 is provided between the first adjusting cavity 103 and the second adjusting cavity 104. The first sealing portion 1212 slides upward to connect the first connecting hole 105 and the adjusting outlet 102. The first sealing portion 1212 slides downward to separate the first connecting hole 105 and the adjusting outlet 102. The second adjustment assembly 13 includes a second sealing seat 131 and a second sealing cover 132, a sealing ball 133 is disposed between the second sealing seat 131 and the second sealing cover 132, and a second adjustment spring 134 that allows the sealing ball 133 to abut against or move away from the second sealing seat 131.

[0032] The pressurized high-pressure liquid from the regulating device enters through the regulating inlet 101. There are two regulating inlets 101, which are respectively connected to the pressurized outlets 302 on both sides of the hydraulic booster pump 3. The high-pressure liquid can smoothly enter the first regulating chamber 103 through the first regulating component 12, and then enter the connecting valve 9 through the regulating outlet 102. When a large amount of high-pressure liquid rushes into the first regulating chamber 103, the sealing part 1212 of the first regulating piston 121 moves upward and connects the first regulating chamber 103 and the second regulating chamber 104. The high-pressure liquid is absorbed and buffered by the second regulating chamber 104, and the high-pressure liquid absorbed by the second regulating chamber 104 can also directly enter the regulating inlet 101 for pressurization.

[0033] The abrasive tank 2 is fixedly connected to a mixing valve seat 14. The mixing valve seat 14 has a through-hole 141 and a liquid inlet 142 and a liquid outlet 143 that are vertically connected to the abrasive tank 2. A mixing nozzle 15 is fixedly connected to the installation cavity 141. The outer periphery of the mixing nozzle 15 has two sealing grooves 151 that cooperate with the installation cavity 141. A sealing element 21 is provided in the sealing grooves 151. A liquid passage groove 152 is provided between the sealing grooves 151. The mixing nozzle 15 has a straight liquid inlet channel 153. The liquid inlet 142 is located between the two sealing grooves 151 and is connected to the liquid inlet channel 153 through the liquid passage groove 152. A sand measuring piston 16 is also slidably arranged in the installation cavity 141. The sand measuring piston 16 has a mixing channel 161 that is connected to the liquid inlet channel 153. The sand measuring piston 16 controls the opening and closing of the mixing channel 161 and the liquid outlet 143. A sand metering switch is fixedly connected to the mixing valve seat 14. The sand metering switch is sleeved on the outer periphery of the sand metering piston 16. One end of the sand metering switch is threaded to an adjusting nut. A reset element is provided between the adjusting nut and the sand metering piston 16. The liquid inlet channel 153 of the mixing nozzle 15 is the high-pressure inlet. The liquid inlet channel 153 is connected to the connection hole 904 through a one-way valve. A valve core 17 is fixedly installed at the end of the mixing nozzle 15 near the sand metering piston 16. A piston alloy 18 is fixedly installed at the end of the sand metering piston 16 near the mixing nozzle 15. The inner circumferential surface of the piston alloy 18 abuts against or moves away from the outer periphery of the valve core 17 to control the opening and closing of the mixing channel 161 and the outlet hole 143. The outer periphery of the mixing nozzle 15 located at one end of the valve core 17 has an L-shaped groove 154. The piston alloy 18 and the outlet hole 143 are arranged opposite each other and always have a notch 155. The notch 155 is always connected to the L-shaped groove 154. The valve core 17 has a through hole 171, which is always connected to the liquid inlet channel 153 and the mixing channel 161. A second seal 19 and a third seal 20 are provided between the measuring piston 16 and the mounting cavity 141. A replenishment groove 162 is provided on the outer periphery of the measuring piston 16, located between the second seal 19 and the third seal 20. The replenishment groove 162 is connected to the liquid inlet channel 153 through a replenishment hole 144. A flow control valve is provided on the liquid inlet channel 153 to control the flow rate and to close and open the flow.

[0034] The mixing valve seat 14 ensures on-demand and precise mixing of abrasive. The movement of the abrasive metering piston 16 controls the timing and flow rate of the abrasive entering the mixing channel 161. The notch 155 engages with the L-shaped groove 154 to achieve low-pressure bypass in the closed state, maintaining pipeline flow and ensuring sensitive piston response, allowing for real-time adjustment of the abrasive supply. Pressure pulsation is controlled within ±5%, improving the smoothness of workpiece cuts and eliminating burr-free fractures.

[0035] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection defined by the claims of the present invention.

Claims

1. A water-cooled cutting machine for mining, comprising a casing (1), wherein an abrasive tank (2), a hydraulic booster pump (3), and an accumulator (4) fixedly connected inside the casing (1), characterized in that: The chassis (1) is externally connected to a three-way valve (5). The three-way valve (5) is connected to an external liquid inlet pipe (6), a normal pressure liquid outlet pipe (7), and a low pressure liquid outlet pipe (8). The accumulator (4) is fixedly connected to a connecting valve (9). The connecting valve (9) has interconnected connecting holes 1 (901), 2 (902), 3 (903), 4 (904), and 5 (905). The accumulator (4) is connected to connecting hole 1 (901). The atmospheric pressure outlet pipe (7) is connected to the second connection hole (902). The hydraulic booster pump (3) has a booster inlet (301) and a booster outlet (302). The low pressure outlet pipe (8) is connected to the booster inlet (301). The booster outlet (302) is connected to the third connection hole (903) through an adjustment device. The fourth connection hole (904) is connected to the high pressure inlet of the abrasive tank (2). The fifth connection hole (905) is connected to a pressure gauge (11). The regulating device includes an regulating seat (10), on which are provided a regulating inlet (101), a regulating outlet (102), a first regulating chamber (103), and a second regulating chamber (104). The regulating inlet (101) is connected to the pressurized outlet (302), and the regulating outlet (102) is connected to the connecting hole (903). The first regulating chamber (103) is provided with a first regulating component (12), and the second regulating chamber (104) is provided with a second regulating component. The section component (13) is connected or disconnected by the regulating inlet (101) and the first regulating chamber (103) through the first regulating component (12), the regulating outlet (102) is directly connected to the first regulating chamber (103), the first regulating chamber (103) and the second regulating chamber (104) are connected or disconnected by the cooperation of the first regulating component (12) and the second regulating component (13), and the second regulating chamber (104) and the regulating inlet (101) are directly connected by the second connecting hole (106); The first adjustment assembly (12) includes a first adjustment piston (121), a first sealing seat (122) and a first sealing cover (123), with a first adjustment spring (124) between the first sealing cover (123) and the first adjustment piston (121), and the first adjustment piston (121) sliding in a sealed manner within the first adjustment cavity (103); The first adjusting piston (121) comprises a guide portion (1211), a first sealing portion (1212), and a second sealing portion (1213). The diameter of the first sealing portion (1212) is larger than the diameters of the guide portion (1211) and the second sealing portion (1213). The first sealing seat (122) has a first through hole (1221). The second sealing portion (1213) cooperates with the first sealing seat (122) to abut against and seal the first through hole (1221) or move away from the first through hole (1221). The first sealing cover (123) is provided with a guide hole (1231), the guide part (1211) cooperates with the guide hole (1231), the first adjustment cavity (103) and the second adjustment cavity (104) have a first connecting hole (105), the sealing part (1212) slides upward to connect the first connecting hole (105) and the adjustment outlet (102), and the sealing part (1212) slides downward to separate the first connecting hole (105) and the adjustment outlet (102); The second adjustment assembly (13) includes a second sealing seat (131) and a second sealing cover (132), a sealing ball (133) is disposed between the second sealing seat (131) and the second sealing cover (132), and a second adjustment spring (134) that allows the sealing ball (133) to abut against or move away from the second sealing seat (131); The abrasive tank (2) is fixedly connected to a mixing valve seat (14). The mixing valve seat (14) has a through-hole (141) and a liquid inlet (142) and a liquid outlet (143) that vertically connect the mounting cavity (141) and the abrasive tank (2). A mixing nozzle (15) is fixedly connected to the mounting cavity (141). The outer periphery of the mixing nozzle (15) has two sealing grooves (151) that mate with the mounting cavity (141). A liquid passage groove (152) is formed between the sealing grooves (151). The mixing nozzle (15) has a straight liquid inlet channel (153), the liquid inlet hole (142) is located between two sealing grooves (151) and is connected to the liquid inlet channel (153) through the liquid passage groove (152), and a sand measuring piston (16) is slidably arranged in the mounting cavity (141). The sand measuring piston (16) has a mixing channel (161) connected to the liquid inlet channel (153), and the sand measuring piston (16) controls the opening and closing of the mixing channel (161) and the liquid outlet hole (143).

2. The water-cooled cutting machine for mining according to claim 1, characterized in that: A valve core (17) is fixedly provided at the end of the mixing nozzle (15) near the sand measuring piston (16), and a piston alloy (18) is fixedly provided at the end of the sand measuring piston (16) near the mixing nozzle (15). The inner circumferential surface of the piston alloy (18) abuts against or moves away from the outer circumference of the valve core (17) to control the opening and closing of the mixing channel (161) and the liquid outlet (143).

3. A water-cooled cutting machine for mining according to claim 2, characterized in that: The mixing nozzle (15) has an L-shaped groove (154) on the outer periphery of one end of the valve core (17). The piston alloy (18) and the liquid outlet (143) are arranged opposite to each other and always have a notch (155). The notch (155) is always connected to the L-shaped groove (154).

4. A water-cooled cutting machine for mining according to claim 3, characterized in that: The valve core (17) has a through hole (171) that is always connected to the liquid inlet channel (153) and the mixing channel (161).

5. A water-cooled cutting machine for mining according to claim 1, characterized in that: A second seal (19) and a third seal (20) are provided between the sand measuring piston (16) and the mounting cavity (141). A replenishment groove (162) is provided on the outer periphery of the sand measuring piston (16). The replenishment groove (162) is located between the second seal (19) and the third seal (20). The replenishment groove (162) is connected to the liquid inlet channel (153) through the replenishment hole (144).

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