A spray water valve group

Abstract

A spray water valve group belongs to the technical field of valves and includes a spray water valve electromagnetic pilot valve and a spray water valve main control valve. The inlet pipeline is connected to a damping orifice, a damping check valve, and a pilot valve filter through a main filter pipeline, and then through a tee joint, one path is connected to the liquid inlet of the spray water valve electromagnetic pilot valve. The other path through the tee joint is connected to an accumulator. The spray water valve electromagnetic pilot valve and the spray water valve main control valve are correspondingly connected. A spray water filter can be provided at the water inlet of the spray water valve main control valve. After the emulsion is filtered and stabilized, the electromagnetic pilot valve is not easily damaged, which improves economic benefits, production efficiency, protects the physical health of front-line employees underground, and effectively prevents the occurrence of occupational diseases.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to a spray water valve group, which can be used for the transformation of the spray water valve of the fifth set of hydraulic support ZY4400 / 06 / 15D (support model) of a coal planer. Background Art

[0002] The cooling spray system of a coal planing face is the guarantee for the normal operation of mechanical equipment, and the quality of the cooling spray system depends on the rationality of the design. For the spray water valve supporting the fifth set of coal planing hydraulic supports ZY4400 / 06 / 15D newly introduced by our group company in recent years, a large number of control failures and leakage phenomena have occurred. This has increased the equipment maintenance cost and affected the production due to poor cooling of the mechanical equipment on the working face. Therefore, it is necessary to transform the spray water valve supporting the fifth set of coal planer hydraulic support ZY4400 / 06 / 15D.

[0003] A better cooling spray system can reduce the accident rate of mechanical equipment, improve the service life of mechanical equipment, and at the same time provide greater safety guarantees for the physical health and safety production of employees. Therefore, it is necessary to further solve the problems of the spray water valve and optimize the spray control system.

[0004] The spray water valve group includes an electromagnetic pilot valve and a main control valve. The electromagnetic pilot valve is a two-position three-way electromagnetic reversing valve, and the main control valve is a hydraulically controlled two-position two-way reversing valve.

[0005] The electromagnetic pilot valve is the core device of the electro-hydraulic control system, with precise manufacturing process, complex structure, and high price. Neutral water is used in the coal planing face of Xiaoqing Mine. Although it has been sedimented and filtered, the water quality is relatively hard and there are many mechanical impurities. Tiny impurity particles flow into the interior of the hydraulic components through the emulsion, acting as an abrasive between the seals, accelerating the wear of the components, and causing leakage in the electromagnetic pilot valve of the spray water valve group. Larger impurity particles block the throttle port of the electromagnetic pilot valve of the spray water valve group and jam the spool of the electromagnetic pilot valve of the spray water valve group, resulting in control failure of the spray water valve group. The damage of the electromagnetic pilot valve is the reason for the control failure and leakage of the spray water valve. Summary of the Invention

[0006] The purpose of the present invention is to provide a spray water valve group, in which the emulsion is filtered and pressure-stabilized, so that the electromagnetic pilot valve is not easily damaged and leaked.

[0007] The technical solution adopted is:

[0008] A spray water valve group includes an electromagnetic pilot valve of the spray water valve and a main control valve of the spray water valve.

[0009] The technical key points are as follows:

[0010] After the inlet pipeline is connected to the damping orifice, damping check valve and pilot valve filter through the main filter pipeline, it is connected to the liquid inlet of the electromagnetic pilot valve of the spray water valve through a tee joint. The other branch of the tee joint is connected to the accumulator.

[0011] The electromagnetic pilot valve of the spray water valve and the main control valve of the spray water valve are correspondingly connected.

[0012] The water inlet pipeline is connected to the water inlet of the main control valve of the spray water valve, and the main control valve of the spray water valve has a water outlet.

[0013] The control liquid port of the first chamber of the electromagnetic pilot valve of the spray water valve is connected to the control liquid port of the first chamber of the main control valve of the spray water valve through the first control liquid path of the spray water valve.

[0014] The control liquid port of the second chamber of the electromagnetic pilot valve of the spray water valve is connected to the control liquid port of the second chamber of the main control valve of the spray water valve through the second control liquid path of the spray water valve.

[0015] The first chamber of the electromagnetic pilot valve of the spray water valve has a liquid return port.

[0016] The second chamber of the electromagnetic pilot valve of the spray water valve has a liquid return port.

[0017] The first chamber of the main control valve of the spray water valve has a water outlet.

[0018] The second chamber of the main control valve of the spray water valve has a water outlet.

[0019] A spray water filter may be provided at the water inlet of the main control valve of the spray water valve.

[0020] Its advantages are as follows:

[0021] It can be directly used on the plow shearer hydraulic support ZY4400 / 06 / 15, sharing part of the liquid path with a set of electro-hydraulic directional valve group on the original hydraulic support ZY4400 / 06 / 15D. Its service life exceeds that of the original spray water valve by 4 months, and no damage has occurred. Or it can also be used alone with a damping orifice, damping check valve and pilot filter in similar occasions.

[0022] The electromagnetic pilot valve of the electro-hydraulic directional valve group on the plow shearer hydraulic support ZY4400 / 06 / 15D and the electromagnetic pilot valve of the spray water valve group are of the same specification and model and can be interchangeably used.

[0023] The spray water valves of 152 sets of supports in the W701 working face of our mine have all been improved according to the above scheme. Through on-site internal tests and feedback information during production, the effect is very ideal. The direct economic benefits after transformation are as follows:

[0024] The maintenance cost of each electromagnetic pilot valve is 1,500 yuan. After transformation, 20 electromagnetic pilot valves can be damaged less per month. Calculated based on the 8-month recoverable period of the W701 working face: 1,500×20×8 = 240,000 yuan.

[0025] Before the transformation, the amount of emulsion leaked by the spray water valve in one day was 9,600 L = 9.6 m 3 , 1 m 3 The price of the emulsion was 260 yuan. Calculated based on the 8 months of recoverable working face: 9.6×260×8×30 = 599,000 yuan.

[0026] Indirect economic benefits after the transformation:

[0027] After the transformation, the hydraulic support in the working face can be moved normally, and the temperature of the motor reducer of the plow coal shearer is normal. The working face advances 1 m more per day than before the transformation, producing 320 more tons of coal. Calculated at the raw coal unit price of 365 yuan / T: 320×365 = 1,168,000 yuan

[0028] The spray water valve group in the working face can spray normally, effectively suppressing the flying of coal dust and improving the working environment of the working face. It truly protects the physical health of the front-line employees underground and effectively prevents the occurrence of occupational diseases.

[0029] With the extensive construction of the plow coal working face in the group company, the performance requirements for the equipment used in the plow coal working face are getting higher and higher. The cooling spray system is particularly prominent in terms of the working face output and ensuring the health of employees. Continuously strengthening the research on the working principle of the plow coal equipment, improving the working performance, extending its service life, and ensuring the normal operation of the equipment are of great significance. Description of the drawings

[0030] Figure 1 It is the schematic diagram of the original designed liquid supply circulation system.

[0031] Figure 2 It is Figure 1 The upper partial enlarged view of

[0032] Figure 3 It is Figure 1 The lower partial enlarged view of

[0033] Figure 4 It is the schematic diagram of the designed liquid supply circulation system after the new transformation.

[0034] Figure 5 It is Figure 4 The upper partial enlarged view of

[0035] Figure 6 It is Figure 4 The lower partial enlarged view of

[0036] Figure 7 It is the schematic diagram of the local liquid supply circulation system after the new transformation. Entering the electromagnetic pilot valve of the spray water valve, it passes through the damping orifice, damping check valve and pilot valve filter.

[0037] R is the emulsion return liquid, and T is the overflow.

[0038] Electro-hydraulic reversing valve group 1, spray water valve group 2, main filter 3, electromagnetic pilot valve of spray water valve 4, main valve of electro-hydraulic reversing valve 5, damping orifice 6, damping check valve 7, pilot valve filter 8, electromagnetic pilot valve of electro-hydraulic reversing valve 9, accumulator 10, spray water pipe 11, spray water filter 12, main control valve of spray water valve 13.

[0039] Hydraulic support hydraulic cylinder 14, first control liquid path of spray water valve 15.

[0040] Original three-way joint 16, three-way joint 17.

[0041] First chamber of electromagnetic pilot valve of spray water valve 18, second chamber of electromagnetic pilot valve of spray water valve 19.

[0042] First chamber of main control valve of spray water valve 20, second chamber of main control valve of spray water valve 21.

[0043] First chamber of electromagnetic pilot valve of electro-hydraulic reversing valve 22, second chamber of electromagnetic pilot valve of electro-hydraulic reversing valve 23.

[0044] First chamber of main valve of electro-hydraulic reversing valve 24, second chamber of main valve of electro-hydraulic reversing valve 25.

[0045] Second control liquid of spray water valve 26. Specific implementation mode

[0046] First, take a look at Figure 1 the difference in the liquid supply lines:

[0047] The electro-hydraulic reversing valve group 1 and the spray water valve group 2 are respectively the parts within the corresponding dash-dotted frames, which are known technologies.

[0048] High-pressure emulsion P passes through the main filter 3 (filtration accuracy 40μm) and the original three-way joint 16 and is divided into two liquid paths: One path of the joint supplies liquid to the electromagnetic pilot valve 4 of the spray water valve through a high-pressure hose. One path enters the electro-hydraulic reversing valve group 1 through a high-pressure hose and is divided into two liquid paths within the valve group. One liquid path supplies liquid to the main valve 5 of the large-flow electro-hydraulic reversing valve. One path, after passing through the damping orifice 6, the damping check valve 7, and the pilot valve filter 8, is further divided into two liquid paths. One path supplies liquid to the electromagnetic pilot valve 9 of the electro-hydraulic reversing valve, and one path goes to the high-pressure terminal accumulator 10.

[0049] The emulsion is a liquid composed of 3%-5% (mass percentage) of emulsified oil and water. The high-pressure liquid in the hydraulic support hydraulic cylinder 14, the electromagnetic pilot valve 4 of the spray water valve, and the electro-hydraulic reversing valve group 1 is all emulsion, and only the liquid in the spray water pipe 11 is ordinary water.

[0050] The inlet of the spray water pipe 11 is provided with a spray water filter 12. Water enters the main control valve 13 of the spray water valve, and the spraying is controlled by the electromagnetic pilot valve 4 of the spray water valve. There is one main control valve 13 of the spray water valve and one electromagnetic pilot valve 4 of the spray water valve. Each valve has two chambers to control two states. In one case, it sprays in front of the support A, and in the other case, it sprays behind the support B. The main valve 5 of the electro-hydraulic directional valve controls the supply of liquid to the hydraulic support cylinder and the return of the liquid to the emulsion tank.

[0051] For Figure 1 the analysis of the liquid supply circuits of the electro-hydraulic directional valve group 1 and the spray water valve group 2 in

[0052] The liquid supply to the electromagnetic pilot valve 4 of the spray water valve is directly supplied by the emulsion pump station with high pressure (rated pressure 31.5 Mpa) and large flow (rated flow 315 L / min) after passing through the main filter 2.

[0053] The control liquid circuit of the electromagnetic pilot valve 9 of the electro-hydraulic directional valve is complex, including a damping orifice 6, a damping check valve 7, a pilot valve filter 8, and an accumulator 10. The control liquid circuit is a sealed cavity with one end closed, and the terminal is the accumulator 10. When the electromagnetic pilot valve 9 of the electro-hydraulic directional valve is not working, there is no liquid flow in the whole liquid circuit, and the liquid pressure in the liquid circuit is the supply pressure of the emulsion pump station (rated pressure 31.5 Mpa).

[0054] The function of the control liquid circuit of the electromagnetic pilot valve 9 of the electro-hydraulic directional valve: That is, the reason analysis for why there is no leakage phenomenon in the electromagnetic pilot valve 9 of the electro-hydraulic directional valve.

[0055] The damping check valve 7 is on the pipeline, stabilizes the energy of the liquid flow, can effectively reduce the pulsating pressure, and realizes the function of the check valve by relying on its own structure.

[0056] The pilot valve filter 8 is an in-built 25μm high-precision filter with strong dirt-holding capacity and large filtering area, ensuring the cleanliness of the liquid used by the electromagnetic pilot valve 9 of the electro-hydraulic directional valve.

[0057] The accumulator 10 can absorb and relieve hydraulic shock, reduce noise, effectively prevent the hydraulic components of the electro-hydraulic directional valve group 1 from failing, and extend the service life.

[0058] There is a damping orifice 6 in the control liquid circuit. According to the liquid flow rate calculation formula for the liquid flowing through the damping orifice, that is

[0059] q = πd 4 Δp / 128μL

[0060] In the formula, d - the diameter of the damping orifice 6, with the unit of m.

[0061] μ - the dynamic viscosity of the emulsion, with the unit of N.S / m 2 。

[0062] L - the length of the damping orifice 6, with the unit of m.

[0063] Δp - The pressure difference across the damping orifice 6, with the unit of Pa.

[0064] The diameter of the damping orifice 6 is 0.0015 m, and the dynamic viscosity of the emulsion liquid is 0.02 N·s / m 2 , the length of the damping orifice 6 is 0.012 m, and the pressure difference across the damping orifice 6 is 4×10 6 Pa; Substituting these values gives

[0065] q = (3.14×0.0015 4 ×4×10 6 ) / (128×0.02×0.012) = 124.14 L / min

[0066] As can be seen from the above calculations, when the electromagnetic pilot valve 9 of the electro-hydraulic directional valve is working, the flow rate of the liquid in the control chamber (within the dash-dotted frame of the electro-hydraulic directional valve group 1 in the figure) decreases after passing through the damping orifice 6. The electromagnetic pilot valve 9 of the electro-hydraulic directional valve supplies liquid with a small flow rate (q = (3.14×0.00154×4×106) / (128×0.02×0.012) = 124.14 L / min). The main characteristics of small-flow liquid supply are: it can accurately control the liquid flow rate, reduce the impact on hydraulic components, and smoothly open to improve the working stability of hydraulic components.

[0067] By comparing the control liquid circuits of the electromagnetic pilot valve 4 of the spray water valve and the electromagnetic pilot valve 9 of the electro-hydraulic directional valve, the root cause of the damage to the electromagnetic pilot valve 4 of the spray water valve can be found:

[0068] Controlling the liquid with a large flow rate cannot accurately control the liquid flow rate and directly impacts the hydraulic components inside the electromagnetic pilot valve 4 of the spray water valve.

[0069] There is no voltage stabilizing device in the control liquid circuit, and the pulsating pressure is large.

[0070] There is no fine filter installed on the control liquid circuit, and impurity particles below 40 μm directly enter the body of the electromagnetic pilot valve 4 of the spray water valve, causing leakage of the electromagnetic pilot valve 4 of the spray water valve and failure of the control system.

[0071] There is no accumulator installed on the control liquid circuit, which cannot absorb and relieve hydraulic shock and shortens the service life of hydraulic components.

[0072] Solution to the problem:

[0073] According to the above analysis, the following treatment plan is formulated:

[0074] Change the control liquid circuit of the electromagnetic pilot valve 4 of the spray water valve to be supplied with liquid from the control liquid circuit controlled by the electro-hydraulic directional valve group 1, as Figure 4 shown.

[0075] The emulsion inlet pipeline is connected to the damping orifice 6, damping check valve 7, and pilot valve filter 8 through the main filter 3 pipeline, and then supplies liquid to the liquid inlet p of the first chamber 22 of the electro-hydraulic directional valve solenoid pilot valve 9 and the liquid inlet p of the second chamber 23 of the electro-hydraulic directional valve solenoid pilot valve. One way supplies liquid to the liquid inlet p of the first chamber 18 of the spray water valve solenoid pilot valve 4 and the liquid inlet p of the second chamber 19 of the spray water valve solenoid pilot valve through the tee joint 17, and the other way is connected to the accumulator 10 through the tee joint 17.

[0076] The control liquid port a of the first chamber 18 of the spray water valve solenoid pilot valve is connected to the control liquid port a of the first chamber 20 of the spray water valve main control valve through the first spray water valve control liquid path 15.

[0077] The control liquid port a of the second chamber 19 of the spray water valve solenoid pilot valve is connected to the control liquid port a of the second chamber 21 of the spray water valve main control valve through the second spray water valve control liquid path 26.

[0078] The return liquid port o of the first chamber 18 of the spray water valve solenoid pilot valve flows back to the emulsion tank through the overflow port T.

[0079] The return liquid port o of the second chamber 19 of the spray water valve solenoid pilot valve flows back to the emulsion tank through the overflow port T..

[0080] The water inlet pipeline is provided with a spray water filter 12, and then the pipeline is connected to the water inlet p of the first chamber 20 of the spray water valve main control valve and the water inlet p of the second chamber 21 of the spray water valve main control valve.

[0081] The first chamber 20 of the spray water valve main control valve has a water outlet b, and the pipeline is connected to a water outlet nozzle A.

[0082] The second chamber 21 of the spray water valve main control valve has a water outlet b, and the pipeline is connected to another water outlet nozzle B.

[0083] Figure 1 Analysis of the upper part of the liquid path.

[0084] Before reaching the damping orifice 6, the emulsion inlet pipeline enters the liquid inlet of the two chambers of the electro-hydraulic directional valve main valve 5.

[0085] The emulsion enters the liquid inlet of the two chambers of the electro-hydraulic directional valve solenoid pilot valve 9 after passing through the damping orifice 6, damping check valve 7, and pilot valve filter 8.

[0086] The return liquid ports of the two chambers of the electro-hydraulic directional valve solenoid pilot valve 9 return to the emulsion tank.

[0087] The control liquid port a of the first chamber 22 of the electro-hydraulic directional valve solenoid pilot valve is connected to the control liquid port a of the first chamber 24 of the electro-hydraulic directional valve main valve through the corresponding control liquid path.

[0088] The control liquid port a of the second chamber 23 of the electromagnetic pilot valve of the electro-hydraulic directional valve is connected to the control liquid port a of the second chamber 25 of the main valve of the electro-hydraulic directional valve through the corresponding control liquid path.

[0089] The liquid port b of the first chamber 24 of the main valve of the electro-hydraulic directional valve is connected to the upper chamber of the hydraulic support hydraulic cylinder 14.

[0090] The liquid port b of the second chamber 25 of the main valve of the electro-hydraulic directional valve is connected to the lower chamber of the hydraulic support hydraulic cylinder 14.

[0091] The return liquid port o of the first chamber 24 of the main valve of the electro-hydraulic directional valve is connected to the return emulsion tank.

[0092] The return liquid port o of the second chamber 25 of the main valve of the electro-hydraulic directional valve is connected to the return emulsion tank.

[0093] When the electromagnet of the first chamber 22 of the electromagnetic pilot valve of the electro-hydraulic directional valve is energized, the spool moves to the right, the p port and the a port are connected, and through the control liquid path, the first chamber 24 of the main valve of the electro-hydraulic directional valve is controlled, the spool moves to the right, the p port and the b port are connected, and liquid is supplied to the upper chamber of the hydraulic cylinder. The liquid in the lower chamber of the hydraulic cylinder is connected to the return emulsion tank through the o port of the second chamber 25 of the main valve of the electro-hydraulic directional valve.

[0094] In the opposite process, liquid is supplied to the lower chamber of the hydraulic cylinder, and the upper chamber of the hydraulic cylinder returns liquid.

[0095] Working principle:

[0096] The working process of the electro-hydraulic directional valve remains unchanged.

[0097] When the electromagnet of the first chamber 18 of the electromagnetic pilot valve of the spray water valve is energized, the spool moves to the right, then the liquid inlet port p is connected to the control liquid port a, and through the first control liquid path 15 of the spray water valve, the spool of the first chamber 20 of the main control valve of the spray water valve moves to the left, and the water outlet b discharges water, and water is sprayed at A. Similarly, when the electromagnet of the second chamber 19 of the electromagnetic pilot valve of the spray water valve is energized, water is sprayed at B.

[0098] When the electromagnet of the first chamber 18 of the electromagnetic pilot valve of the spray water valve is de-energized, the spool moves to the left, the a port and the o port are connected, the control liquid flows back to the return emulsion tank through the overflow port T, and the spool of the corresponding first chamber 20 of the main control valve of the spray water valve does not move and does not discharge water.

[0099] Thus, it is ensured that the electromagnetic pilot valve 4 of the spray water valve can smoothly control the main control valve 13 of the spray water valve to complete the spray dust reduction work.

[0100] This transformation method only needs to install the three-way joint (reducing tee) between the electro-hydraulic directional valve group 2 and the accumulator 10 after the main filter 3. The transformation method is simple and no material cost needs to be invested. After the liquid supply line is transformed, the electromagnetic pilot valve 4 of the spray water valve is protected in the same way as the electromagnetic pilot valve 9 of the electro-hydraulic directional valve group, and the service life is extended.

[0101] The electromagnetic pilot valve 9 of the electro-hydraulic directional valve and the electromagnetic pilot valve 4 of the spray water valve are both two-position three-way electromagnetic directional valves.

[0102] The main control valve 13 of the spray water valve is a hydraulically controlled two-position two-way valve.

[0103] The main valve 5 of the electro-hydraulic directional valve is a hydraulically controlled two-position three-way valve.

Claims

1. A spray water valve group, comprising a spray water valve electromagnetic pilot valve (4) and a spray water valve main control valve (13), characterized in that: After the inlet pipeline is connected to the damping orifice (6), the damping check valve (7) and the pilot valve filter (8) through the main filter (3) pipeline, one way of the three-way joint (17) is connected to the liquid inlet of the spray water valve electromagnetic pilot valve (4); the other way of the three-way joint (17) is connected to the accumulator (10); The spray water valve electromagnetic pilot valve (4) and the spray water valve main control valve (13) are correspondingly connected; The water inlet pipeline is connected to the water inlet of the spray water valve main control valve (13), and the spray water valve main control valve (13) has a water outlet; The spray water valve electromagnetic pilot valve (4) has a first chamber (18) of the spray water valve electromagnetic pilot valve and a second chamber (19) of the spray water valve electromagnetic pilot valve; The liquid inlets of the first chamber (18) of the spray water valve electromagnetic pilot valve and the second chamber (19) of the spray water valve electromagnetic pilot valve together serve as the liquid inlet of the spray water valve electromagnetic pilot valve (4); The control liquid port of the first chamber (18) of the spray water valve electromagnetic pilot valve is connected to the control liquid port of the first chamber (20) of the spray water valve main control valve through the first control liquid path (15) of the spray water valve; The control liquid port of the second chamber (19) of the spray water valve electromagnetic pilot valve is connected to the control liquid port of the second chamber (21) of the spray water valve main control valve through the second control liquid path (26) of the spray water valve; The first chamber (18) of the spray water valve electromagnetic pilot valve has a liquid return port; The second chamber (19) of the spray water valve electromagnetic pilot valve has a liquid return port; The spray water valve main control valve (13) has a first chamber (20) of the spray water valve main control valve and a second chamber (21) of the spray water valve main control valve; The water inlets of the first chamber (20) of the spray water valve main control valve and the second chamber (21) of the spray water valve main control valve serve as the water inlet of the spray water valve main control valve (13); The first chamber (20) of the spray water valve main control valve has a water outlet; The second chamber (21) of the spray water valve main control valve has a water outlet; The pilot valve filter (8) is a high-precision filter with a filtration accuracy of 25μm; The main filter (3) is a filter with a filtration accuracy of 40μm; A spray water filter (12) is provided in front of the water inlet of the spray water valve main control valve (13).

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