A pure water medium hydraulic chain tightening device and chain tightening method thereof

Abstract

The present invention discloses a pure water medium hydraulic chain tightening device, including a connecting plate, a pure water motor hydraulic system valve is arranged on the connecting plate, a manual pilot valve is arranged on the pure water motor hydraulic system valve; a pressure reducing valve is also arranged on one side of the pure water motor hydraulic system valve, a pressure gauge I is arranged between the pressure reducing valve and the pure water motor hydraulic system valve, a stop valve is also arranged on one side of the pressure reducing valve, a filter B is arranged between the stop valve and the pressure reducing valve, and the pure water motor hydraulic system valve is also connected to a brake, and the brake is respectively connected to a reducer and a pure water plunger motor. The present invention also discloses a chain tightening method of a pure water medium hydraulic chain tightening device. The problem that ordinary hydraulic chain tighteners cannot use pure water working medium is solved, and the safe and reliable operation of the hydraulic chain tightening device under pure water medium conditions is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control and transmission, and relates to a pure water medium hydraulic chain tightening device. The invention also relates to a chain tightening method of the device. Background Art

[0002] Today, as hydraulic technology is developing rapidly, and human society's requirements for environmental protection, sustainable development, and safe production are constantly increasing, water hydraulic transmission has become a new development trend in hydraulic technology with its outstanding characteristics such as flame retardancy, greenness, cleanliness, and energy saving. With the construction of green mines and the requirements for environmental protection, the demand for hydraulic products with pure water media is increasing.

[0003] At present, underground high-power scraper conveyors and transfer machines all use hydraulic motor chain tighteners, which all use emulsion as the working medium and have a simple structure. However, they have many shortcomings in actual use: 1. The valves of the hydraulic control system are prone to rust and cannot work; 2. The hydraulic control valve group and the motor are prone to failure and have abnormal noise; 3. The hydraulic motor has a short life and low working efficiency; 4. The hydraulic chain tightening device has low torque; 5. It cannot adapt to pure water as the working medium; 6. Continuous operation cannot be achieved. Summary of the invention

[0004] The purpose of the present invention is to provide a pure water medium hydraulic chain tightening device, which solves the problem that ordinary hydraulic chain tightening devices cannot use pure water working medium, and realizes the safe and reliable operation of the hydraulic chain tightening device under pure water medium conditions.

[0005] The object of the present invention is also to provide a chain tightening method for a pure water medium hydraulic chain tightening device.

[0006] The first technical solution adopted by the present invention is a pure water medium hydraulic chain tightening device, including a connecting plate, on which a pure water motor hydraulic system valve is provided, and a manual pilot valve is provided on the pure water motor hydraulic system valve; a pressure reducing valve is also provided on one side of the pure water motor hydraulic system valve, a pressure gauge I is provided between the pressure reducing valve and the pure water motor hydraulic system valve, a filter B is also connected to the pressure reducing valve, and the pure water motor hydraulic system valve is also connected to a brake, and the brake is respectively connected to a reducer and a pure water plunger motor.

[0007] The first technical solution of the present invention is also characterized in that:

[0008] The pure water motor hydraulic system valve includes a valve body, which is provided with a liquid inlet P. The liquid inlet P is connected to the filter A, the manual pilot valve, the hydraulic reversing valve I and the hydraulic reversing valve II in sequence. The hydraulic reversing valve I is connected to the shuttle valve and the directional valve in sequence. The directional valve is connected to the balancing valve II and the balancing valve I respectively. The balancing valve II is connected to the hydraulic reversing valve II. The balancing valve I is connected to the hydraulic reversing valve I. The hydraulic reversing valve I and the hydraulic reversing valve II are both connected to the liquid return port T of the valve body.

[0009] The shuttle valve is also connected to pressure gauge II.

[0010] A one-way valve is arranged between the manual pilot valve and the hydraulic reversing valve I and the hydraulic reversing valve II.

[0011] A stop valve is also provided between the pressure reducing valve and the filter B.

[0012] The reducer includes a reducer housing, in which a reduction output shaft and a gear transmission shaft connected in sequence are arranged in a horizontal direction, a reducer front cover is coaxially mounted on the reduction output shaft, a primary planetary reduction gear assembly and a secondary planetary reduction gear assembly are respectively mounted on the gear transmission shaft, the secondary planetary reduction gear assembly is connected to the reducer front cover, the primary planetary reduction gear assembly is connected to the brake, a primary planetary internal gear ring and a secondary planetary internal gear ring are respectively arranged at both ends of the inner wall of the reducer housing, the primary planetary internal gear ring is meshed with the primary planetary reduction gear assembly, and the secondary planetary internal gear ring is meshed with the secondary planetary reduction gear assembly.

[0013] The first-stage planetary reduction gear assembly includes a first-stage planet carrier installed on the gear transmission shaft, the first-stage planet carrier is connected to the gear transmission shaft through a spline, and at least three groups of first-stage planetary gears are evenly distributed on the first-stage planet carrier; the first-stage planetary gears are meshed with the first-stage planetary inner gear ring.

[0014] The secondary planetary reduction gear assembly includes a secondary planet carrier installed on the gear transmission shaft, and at least three groups of secondary planetary gears are evenly distributed on the secondary planet carrier; the primary planetary gears are meshed with the primary planetary inner gear ring, and an output gear is provided on the gear transmission shaft. The output gear serves as the output gear of the secondary planetary reduction gear assembly and is meshed with the secondary planetary gears; the secondary planet carrier is connected to one end of the reduction output shaft through a spline.

[0015] The brake includes a brake shaft, one end of which passes through the end cover and is connected to the gear transmission shaft, and the other end of the brake shaft is coaxially installed with the rear end cover; a friction plate assembly and a brake cylinder are coaxially installed on the brake shaft in sequence, a brake piston is arranged in the brake cylinder, and a bushing is coaxially installed between the brake piston and the brake cylinder; a plurality of spring mounting holes are evenly distributed on the side of the brake piston close to the rear end cover, and a spring is arranged in the spring mounting hole.

[0016] The second technical solution adopted by the present invention is a chain tightening method of a pure water medium hydraulic chain tightening device, which specifically includes the following steps:

[0017] Step 1, pure water high pressure liquid enters the pure water medium hydraulic chain tightening device from P, the stop valve is opened, the high pressure water flows through the filter B to filter out impurities, and enters the pressure reducing valve, and the original 31.5MPa high pressure water is reduced to within 5-16MPa according to the actual working conditions. The pressure after decompression is the system working pressure of the pure water hydraulic chain tightening device, and at the same time, the pressure gauge I displays the reduced pressure;

[0018] Step 2, the decompressed water flows out from the outlet of the pressure reducing valve and enters the pure water motor hydraulic system valve;

[0019] Step 3, operate the manual pilot valve 3 on the pure water motor hydraulic system valve to control the brake to release the brake and the pure water high-speed plunger motor to rotate. The pure water high-speed plunger motor outputs power to the reducer, and after passing through the reducer, it drives the scraper conveyor through the gear box to tighten the chain;

[0020] Step 4: After driving the scraper conveyor to reversely drag the chain to the set length, operate the manual pilot valve to stop the pure water high-speed plunger motor and brake it at the same time to keep the chain tight. The worker then enters the chain cutting and connecting process.

[0021] Step 5, after the chain is cut and connected, operate the manual pilot to control the brake to release the brake and the pure water high-speed plunger motor to rotate, drive the reducer, and then drive the scraper conveyor to rotate forward and reverse through the gear box to release the tension on the chain, that is, relax the chain;

[0022] Step 6. After the chain tension is released, stop operating the manual pilot valve, apply the brake, stop the pure water high-speed plunger motor, and finally close the stop valve, stop the system fluid supply, and cut off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor. The scraper conveyor chain tightening work is completed.

[0023] The beneficial effects of the present invention are that the present invention adopts a pressure reducing valve made of all stainless steel and with strong anti-pollution ability and a compulsory filter structure to ensure the cleanliness of the pure water medium and the high-pressure liquid with a constant pressure value; secondly, it adopts a manual pilot control method and a unique hydraulic control circuit design. The key is to adopt a two-way balance and a two-way lock circuit to form an oil circuit interlock and balance to ensure the smooth operation and braking of the hydraulic motor and prevent stalling and accidents. In addition, an independent hydraulic control braking circuit is designed to provide dual hydraulic and mechanical braking to ensure safe and reliable operation; thirdly, the hydraulic motor adopts a high-speed plunger motor suitable for pure water medium and can work continuously to ensure the continuous operation of the hydraulic chain tightening device; the motor is also equipped with a reducer and a brake structure to improve the working output torque and impact resistance, and at the same time, a mechanical braking method is added to achieve continuous operation, large torque output, impact resistance and timely braking functions; finally, the hydraulic control system and key components are made of stainless steel or copper, so that the system components are suitable for pure water medium, ensuring the reliability, stability and safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a pure water medium hydraulic chain tightening device of the present invention;

[0025] 2(a) to (c) are schematic diagrams of the valve structure of a pure water motor hydraulic system in a pure water medium hydraulic chain tightening device of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the connection between the reducer and the brake in a pure water medium hydraulic chain tightening device of the present invention;

[0027] Figure 4 yes Figure 3 Cross-sectional view along CC direction.

[0028] In the figure, 1. connecting plate;

[0029] 2. Pure water motor hydraulic system valve, 201. Pressure gauge II, 202. Balance valve I, 203. Valve body, 3. Manual pilot valve, 204. Balance valve II, 205. Check valve, 206. Hydraulic reversing valve I, 207. Hydraulic reversing valve II, 208. Directional valve, 209. Shuttle valve, 210. Filter A;

[0030] 3. Manual pilot valve; 4. Pressure gauge I; 5. Pressure reducing valve; 6. Filter B; 7. Stop valve;

[0031] 8. Reducer; 801. Reducer output shaft; 802. Reducer front cover; 803. Secondary planet carrier; 804. Secondary planet gear; 805. Reducer housing; 806. Secondary planetary inner gear ring; 807. Gear transmission shaft; 808. Primary planet carrier; 809. Primary planet gear; 810. Primary planetary inner gear ring;

[0032] 9. Brake, 9-1. End cover, 9-2. Brake shaft; 9-3. Friction plate assembly; 9-4. Brake cylinder; 9-5. Bushing; 9-6. Brake piston; 9-7. Spring; 9-8. Rear end cover;

[0033] 10.Pure water plunger motor. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The present invention provides a pure water medium hydraulic chain tightening device, such as Figure 1 As shown, it includes a connecting plate 1, on which a pure water motor hydraulic system valve 2 is provided, and on which a manual pilot valve 3 is provided; a pressure reducing valve 5 is also provided on one side of the pure water motor hydraulic system valve 2, and a pressure gauge I4 is provided between the pressure reducing valve 5 and the pure water motor hydraulic system valve 2, and a stop valve 7 is also provided on one side of the pressure reducing valve 5, and a filter B6 is provided between the stop valve 7 and the pressure reducing valve 5, and the pure water motor hydraulic system valve 2 is also connected to a brake 9, and the brake 8 is respectively connected to a reducer 8 and a pure water plunger motor 10.

[0036] As shown in Figures 2(a) to (c) (Figure 2(a) is a stereoscopic view, Figure 2(b) is a left view, and Figure 2(c) is a right view), the pure water motor hydraulic system valve 2 includes a valve body 203. The valve body 203 is provided with a liquid inlet P. The liquid inlet P is connected to the filter A2-10, the manual pilot valve 3, the hydraulic reversing valve I206 and the hydraulic reversing valve II207 in sequence. The hydraulic reversing valve I206 is connected to the shuttle valve 209 and the directional valve 208 in sequence. The directional valve 208 is connected to the balancing valve II204 and the balancing valve I202 respectively. The balancing valve II204 is connected to the hydraulic reversing valve II207. The balancing valve I202 is connected to the hydraulic reversing valve I206. The hydraulic reversing valve I206 and the hydraulic reversing valve II207 are both connected to the return liquid port T of the valve body 202.

[0037] The shuttle valve 209 is also connected to the pressure gauge II201.

[0038] A one-way valve 205 is provided between the manual pilot valve 3 and the hydraulic reversing valve I206 and the hydraulic reversing valve II207.

[0039] Filter A210 uses a plug-in pilot filter element.

[0040] like Figure 3 As shown, the reducer 8 includes a reducer housing 805, in which a reduction output shaft 801 and a gear transmission shaft 807 connected in sequence are arranged in a horizontal direction, a reducer front cover 802 is coaxially installed on the reduction output shaft 801, and a first-stage planetary reduction gear assembly and a second-stage planetary reduction gear assembly are respectively installed on the gear transmission shaft 807, the second-stage planetary reduction gear assembly is connected to the reducer front cover 802, and the first-stage planetary reduction gear assembly is connected to the brake 9, and a first-stage planetary internal gear ring 810 and a second-stage planetary internal gear ring 806 are respectively arranged at both ends of the inner wall of the reducer housing 805, the first-stage planetary internal gear ring 810 is meshed with the first-stage planetary reduction gear assembly, and the second-stage planetary internal gear ring 806 is meshed with the second-stage planetary reduction gear assembly.

[0041] The first-stage planetary reduction gear assembly includes a first-stage planet carrier 808 installed on the gear transmission shaft, the first-stage planet carrier 808 is connected to the gear transmission shaft 809 through a spline, and at least three groups of first-stage planetary gears 809 are evenly distributed on the first-stage planet carrier 808; the first-stage planetary gears 809 are meshed with the first-stage planetary inner gear ring 810.

[0042] The secondary planetary reduction gear assembly includes a secondary planet carrier 803 mounted on a gear transmission shaft 807, and at least three sets of secondary planetary gears 804 are evenly distributed on the secondary planet carrier 803; the primary planetary gear 809 is meshed with the primary planetary inner gear ring 810, and an output gear is provided on the gear transmission shaft 807, and the output gear is meshed with the secondary planetary gear 804 as the output gear of the secondary planetary reduction gear assembly; the secondary planet carrier 803 is connected to one end of the reduction output shaft 801 through a spline;

[0043] The brake 9 includes a brake shaft 9-2, one end of which passes through the end cover 9-1 and is connected to the gear transmission shaft 807, and the other end of the brake shaft 9-2 is coaxially installed with a rear end cover 9-8; the brake shaft 9-2 is coaxially installed with a friction plate assembly 9-3 and a brake cylinder 9-4, a brake piston 9-6 is arranged in the brake cylinder 9-4, and a bushing 9-5 is coaxially installed between the brake piston 9-6 and the brake cylinder 9-4; a plurality of spring installation holes are evenly arranged on the side of the brake piston 9-6 close to the rear end cover 9-8, and a spring 9-7 is arranged in the spring installation hole. The reducer front cover 802 is connected with the reducer output shaft 801, the reducer housing 805 and the end cover 9-1 to form an integrated structure.

[0044] The working principle of a pure water medium hydraulic chain tightening device of the present invention is that when the scraper conveyor chain needs to be tightened, the power supply of the scraper conveyor main engine is cut off, a chain blocker is installed on the chute, and after the gear box is engaged in place, pure water high-pressure liquid is supplied. Pure water high-pressure liquid enters the pure water medium hydraulic chain tightening device from P, the stop valve 7 is opened, and the high-pressure water flows through the filter B6 to filter out impurities and flows into the pressure reducing valve 5, and the original 31.5MPa high-pressure water is reduced to a range of 5-16Mpa according to the actual working conditions. This pressure is the system working pressure of the pure water hydraulic chain tightening device. The decompressed high-pressure water flows out from the outlet of the pressure reducing valve 5, and a small part enters the pressure gauge I4 through the tee, that is, the value displayed by the pressure gauge I4 is the system working pressure of the pure water hydraulic chain tightening device. Another large part enters the liquid inlet P of the valve body 203 of the pure water motor hydraulic control system. The valve body 203 is installed with all components and process plugs. Each component is connected to the corresponding through hole in the valve body 203. At the same time, the high-pressure liquid is divided into two parts: a small part passes through the filter A210 to filter impurities and enters the manual pilot valve 3, which is connected through the inner hole of the valve body 203 and serves as the pilot control liquid of the hydraulic reversing valve I206 and the hydraulic reversing valve II207; most of it enters the working port of the hydraulic reversing valve I206 and the hydraulic reversing valve II207. At this time, the hydraulic reversing valve I206 and the hydraulic reversing valve II207 are both in the closed state.

[0045] The operation control valve drives the motor to rotate forward and reverse. The forward and reverse rotation is only relative:

[0046] (1) Control the motor to rotate forward

[0047] Lift the handle on the left side of the manual pilot valve 3, and the pilot fluid controls the hydraulic reversing valve I206 to switch and open, so that the high-pressure water passes through the hydraulic reversing valve I206 and is divided into three parts by the internal channel of the valve body 203: a small part opens the shuttle valve 209 through the channel and enters the directional valve 208, so that the directional valve 208 switches and opens to pass the fluid, and then comes out from the K port of the valve body 203 and is connected to the BK port of the (normally closed) brake 9 through the oil pipe. The high-pressure water opens the (normally closed) brake 9, releasing its restriction on the pure water plunger motor 10, that is, the brake is released. ; Another small part is connected to the pressure-conducting port of the balancing valve II204 through the channel. Because the balancing valve is used in pairs and has the functions of two-way balancing and two-way locking, it then controls the balancing valve II204 to generate a certain back pressure according to a fixed pressure-conducting ratio and opens a smooth return liquid circuit; another large part flows through the A port of the inflow valve body 203 through the balancing valve I202, and the high-pressure liquid is connected to the R port of the pure water plunger motor 10 through the oil pipe from the A port, which serves as the liquid inlet, so that the pure water plunger motor 10 can rotate after the restriction is released, and the L port is used as the return liquid port, and its oil inlet and return ports are only relative. The low-pressure water that has completed the work flows in from the L port of the pure water plunger motor 10 through the oil pipe and is connected to the B port of the valve body 203. The B port is connected to the balancing valve II204. The low-pressure return liquid flows to the hydraulic reversing valve II207 through the balancing valve II204. Under normal circumstances, the working port of the hydraulic reversing valve II207 is connected to the return liquid port T of the valve body 203, that is, the low-pressure water flows out from the return liquid port T and enters the oil tank or is discharged externally.

[0048] (2) Control the motor reverse

[0049] Lift the handle on the right side of the manual pilot valve 3, and the pilot fluid controls the hydraulic reversing valve II204 to switch and open, so that the high-pressure water passes through the hydraulic reversing valve II207 and is divided into three parts by the internal channel of the valve body 203: a small part opens the shuttle valve 209 through the channel and enters the directional valve 208, so that the directional valve 208 switches and opens to pass the fluid, and then comes out from the K port of the valve body 203 and is connected to the BK port of the normally closed brake 9 through the oil pipe. The high-pressure water opens the (normally closed) brake 9, releasing its restriction on the pure water plunger motor 10, that is, the brake is released. ; Another small part is connected to the pressure-conducting port of the balancing valve I202 through the channel. Because the balancing valve is used in pairs and has the functions of two-way balancing and two-way locking, it then controls the balancing valve I202 to generate a certain back pressure according to a fixed pressure-conducting ratio and opens a smooth return liquid circuit; another large part passes through the B port of the inflow valve body 203 through the balancing valve II207, and the high-pressure liquid is connected to the L port of the pure water plunger motor 10 through the oil pipe from the B port, which serves as the liquid inlet, so that the pure water plunger motor 10 can rotate after the restriction is released, and the R port is used as the return liquid port, and its oil inlet and return ports are only relative. The low-pressure water that has completed the work flows in from the R port of the pure water plunger motor 10 through the oil pipe and is connected to the A port of the valve body 203. The A port is connected to the balancing valve I202. The low-pressure return liquid flows to the hydraulic reversing valve I206 through the balancing valve I202. Under normal circumstances, the working port of the hydraulic reversing valve I206 is connected to the return liquid port T of the valve body 203, that is, the low-pressure water flows out from the return liquid port T and enters the oil tank or is discharged externally.

[0050] Brake deceleration mechanism

[0051] The (normally closed) brake 9 includes an end cover 9-1, a brake shaft 9-2, a friction plate assembly 9-3, a brake cylinder 9-4, a bushing 9-5, a brake piston 9-6, a spring 9-7, a rear end cover 9-8, a seal and other components.

[0052] The end cover 9-1 is connected to the brake cylinder 9-4 and the brake shaft 9-2. The brake shaft 9-2 is provided with an external spline and an output gear, and the brake cylinder 9-4 is provided with an internal spline and a BK port. The friction plate assembly 9-3 is provided with multiple groups of friction plates and steel plates superimposed with a gap for relative movement. The friction plate is connected to the brake shaft 9-2, and the steel plate of the friction plate assembly 9-3 is connected to the internal spline of the brake cylinder 9-4. The bushing 9-5 is combined with the brake piston 9-6 and connected to the brake cylinder 9-4. A sealed cavity is formed after the seal is provided. The brake piston 9-6 can reciprocate linearly and has several spring mounting holes on the back side. The spring 9-7 is installed on the back side of the brake piston 9-6. Finally, the rear end cover 9-8 is connected to the end side of the brake shaft 9-2, and the distance between the rear end cover 9-8 and the brake piston 9-6 is controlled to compress the spring 9-7 and generate sufficient thrust, pushing the brake piston 9-6 to move in the direction of the friction plate assembly 9-3 and press the friction plate assembly 9-3, so that the friction plate and the steel plate in the friction plate assembly 9-3 receive positive pressure and generate sufficient friction, resulting in the friction plate and the steel plate being unable to produce relative movement, thus generating a braking torque. When the BK port of the normally closed brake 9 is not connected to high-pressure fluid, it is in a braking state.

[0053] The reducer 8 and the brake 9 share the end cover 9-1 and are connected together. At this time, the brake shaft 9-2 is inserted and meshed with the primary planetary gear 809. There are three sets of primary planetary gears 809 connected to the primary planetary carrier 808 at 120 degrees and rotate independently (such as Figure 4 CC sectional view), and the primary planetary gear 809 meshes with the primary planetary inner gear ring 810. The primary planetary carrier 808 is provided with an internal spline and is connected with the gear transmission shaft 807. The gear transmission shaft 807 is provided with an output gear and meshes with the secondary planetary gear 804 as an input gear. There are 4 groups (usually 3-5 groups) of secondary planetary gears 804 evenly connected to the secondary planetary carrier at 90° and rotate independently. At the same time, the secondary planetary gear 804 meshes with the secondary planetary inner gear ring 806. The secondary planetary carrier 803 is provided with an internal spline and is connected to one end of the reduction output shaft 801. The reducer front cover 802 is connected to the reduction output shaft 801, the reducer housing 805 and the end cover 810 to form a fixed whole. The last primary planetary gear 809 and the secondary planetary gear 804 run on their respective gear rings to generate deceleration and increase torque, and finally the reduction output shaft 801 outputs torque and speed.

[0054] (2) Working principle of motor chain tightening

[0055] When high-pressure water is passed through the BK port of the normally closed brake 9 and the R port or L port of the pure water plunger motor 10: first, the closed cavity formed by the brake cylinder 9-4, the bushing 9-5 and the brake piston 9-6 in the normally closed brake 9 generates thrust on the brake piston 9-6, overcoming the elastic force of the spring 9-7 to push it to move in the opposite direction and compress the spring 9-7, relieving its pressure on the friction plate assembly 9-3, thereby creating a gap between the friction plate and the steel plate and eliminating the friction force, becoming a free state, that is, releasing the brake. At the same time, the pure water plunger motor 10 is installed on the rear end cover 9-8 and its output shaft is connected to the brake shaft 9-2. Because it is driven by the high-pressure water to generate rotation and torque, it drives the brake shaft 9-2 to rotate and transmit power to the first-stage planetary gear 809, and the first-stage planetary gear 809 meshes with the first-stage planetary inner gear ring 809 to decelerate and increase torque. The decelerated power is then transmitted to the gear transmission shaft 807 through the primary planetary carrier 808, and the gear transmission shaft 807 meshes with the secondary planetary gear 804 as the power input, and the secondary planetary gear 804 meshes with the secondary planetary inner gear ring 806 to decelerate again and increase the torque. After completing the two-stage deceleration, the secondary planetary carrier 803 transmits the power to the deceleration output shaft 801, and the output reaches the required torque and speed. Finally, it is connected to the scraper conveyor to drive the scraper conveyor to rotate forward and reverse (wherein the R port and the L port of the pure water plunger motor 10 only need one end to enter the liquid, and the other end will become the return liquid), completing the chain tightening or loosening.

[0056] The total reduction ratio is the product of the reduction ratios of the primary planetary gear 809 and the secondary planetary gear 804. By adjusting the gear ratio between the planetary reduction gears, the torque of the pure water plunger motor 10 can be increased by 10 to 100 times, and the speed can be reduced by 10 to 100 times.

[0057] When the high-pressure water of the BK port of the normally closed brake 9 and the R port or L port of the pure water plunger motor 10 stops: first, the closed cavity formed by the brake cylinder 9-4, the bushing 9-5 and the brake piston 9-6 in the normally closed brake 9 loses pressure and loses the thrust to the brake piston 9-6, so the brake piston 9-6 rebounds with a strong thrust due to the compression of the spring 9-7, so that it quickly presses the friction plate assembly 9-3, and then eliminates the gap between the friction plate and the steel plate and generates friction, resulting in no relative motion, so a braking torque is generated, that is, the brake limits the power output of the pure water (high-speed) plunger motor 10. At the same time, it loses power due to the loss of pressure and stops running, and finally the operation of the scraper conveyor can be started and stopped.

[0058] method:

[0059] When the scraper conveyor chain needs to be tightened, cut off the power supply of the scraper conveyor main machine and follow the Figure 1 Connect each pipeline one by one, install the chain blocker on the chute, and supply pure water high-pressure liquid after the gear box is engaged.

[0060] The present invention provides a chain tightening method of a pure water medium hydraulic chain tightening device, which specifically comprises the following steps:

[0061] 1. Pure water high-pressure liquid enters the pure water medium hydraulic chain tightening device from P, open the stop valve 7, the high-pressure water flows through the filter B6 to filter out impurities, and enters the pressure reducing valve 5, and the original 31.5MPa high-pressure water is reduced to within 5-16MPa according to the actual working conditions. That is, this pressure is the system working pressure of the pure water hydraulic chain tightening device, which is generally set before leaving the factory, and the pressure gauge I4 displays this pressure.

[0062] 2. The high-pressure water after decompression flows out from the outlet of the pressure reducing valve 5 and enters the pure water motor hydraulic control system valve, which is equipped with all the components and process plugs required for the work.

[0063] 3. Operate the manual pilot valve 3 on the pure water motor hydraulic control system valve. According to actual needs, operate the left and right handles on the manual pilot valve 3 to control the closed brake 9 to release the brake and the pure water plunger motor 10 to rotate. The pure water plunger motor 10 outputs power to the reducer 8. After the reducer 8 obtains the appropriate torque and speed, it drives the scraper conveyor through the gear box to tighten the chain.

[0064] 4. When the scraper conveyor is driven to drag the chain in reverse and stack it to a suitable length, the manual pilot valve 3 is operated to stop the pure water plunger motor 10 from rotating and the normally closed brake 9 is braked at the same time to keep the chain tight, and the workers enter the chain cutting and connecting process.

[0065] 5. When the chain is cut and the chain is cut off, operate the manual pilot valve 3 on the pure water motor hydraulic control system valve to control the closed brake 9 to release the brake and the pure water plunger motor 10 to rotate, drive the reducer 8, and then drive the scraper conveyor to rotate forward and reverse through the gear box to release the tension on the chain, that is, relax the chain.

[0066] 6. After the chain tension is released, stop operating the manual pilot valve 3, the normally closed brake 9 is quickly braked, and the pure water plunger motor 10 stops running. Finally, close the stop valve 7, stop the system fluid supply, and cut off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor, so the chain tightening work of the scraper conveyor is completed.

Claims

1. A pure water medium hydraulic chain tightening device, characterized in that: It includes a connecting plate, on which a pure water motor hydraulic system valve is provided, and a manual pilot valve is provided on the pure water motor hydraulic system valve; a pressure reducing valve is also provided on one side of the pure water motor hydraulic system valve, a pressure gauge I is provided between the pressure reducing valve and the pure water motor hydraulic system valve, a filter B is also connected to the pressure reducing valve, and the pure water motor hydraulic system valve is also connected to a brake, and the brake is respectively connected to a reducer and a pure water plunger motor; The pure water motor hydraulic system valve includes a valve body, which is provided with a liquid inlet P, which is connected to the filter A, the manual pilot valve, the hydraulic reversing valve I and the hydraulic reversing valve II in sequence, the hydraulic reversing valve I is connected to the shuttle valve and the directional valve in sequence, the directional valve is connected to the balancing valve II and the balancing valve I respectively, the balancing valve II is connected to the hydraulic reversing valve II, the balancing valve I is connected to the hydraulic reversing valve I, and the hydraulic reversing valve I and the hydraulic reversing valve II are both connected to the liquid return port T of the valve body; a stop valve is also provided between the pressure reducing valve and the filter B; When the scraper conveyor chain needs to be tightened, the power supply of the scraper conveyor main engine is cut off, and the chain blocker is installed on the chute. After the gear box is engaged in place, pure water high-pressure liquid is supplied; the pure water high-pressure liquid enters the pure water medium hydraulic chain tightening device, the stop valve is opened, and the high-pressure water flows through the filter B to filter out impurities and flows into the pressure reducing valve. The high-pressure water after pressure reduction flows out from the outlet of the pressure reducing valve, and a small part enters the pressure gauge I through the tee, that is, the value displayed on the pressure gauge I is the system working pressure of the pure water hydraulic chain tightening device; another large part enters the liquid inlet P of the valve body of the pure water motor hydraulic control system valve, and the valve body is installed with all components and process plugs. Each component is connected to the corresponding through hole in the valve body. At the same time, the high-pressure liquid is divided into two parts: a small part enters the manual pilot valve after filtering impurities through the filter A, which is connected through the hole in the valve body and serves as the pilot control liquid of the hydraulic reversing valve I and the hydraulic reversing valve II; most of it enters the working port of the hydraulic reversing valve I and the hydraulic reversing valve II, at this time, the hydraulic reversing valve I and the hydraulic reversing valve II2 are both closed; Lift the handle on the left side of the manual pilot valve, and the pilot fluid controls the hydraulic reversing valve I to switch and open, so that the high-pressure water passes through the hydraulic reversing valve I and is divided into three parts by the internal channel of the valve body: a small part opens the shuttle valve through the channel and enters the directional valve, so that the directional valve switches and opens to pass the liquid, and then comes out from the K port of the valve body and communicates with the BK port of the brake through the oil pipe. The high-pressure water opens the brake and releases its restriction on the pure water plunger motor, that is, the brake is released; another small part is connected with the pressure guide port of the balance valve II through the channel. Because the balance valve is used in pairs and has the functions of bidirectional balance and bidirectional lock, the balance valve II is controlled to generate a certain back pressure according to a fixed pressure guide ratio and open a smooth return liquid circuit; another large part flows through the balance valve I into the A port of the valve body, and the high-pressure liquid is connected to the R port of the pure water plunger motor through the oil pipe from the A port as the liquid inlet, so that the pure water plunger motor rotates after the restriction is released, and the L port is used as the return liquid port, and the inlet and return oil ports are only relative; The low-pressure water that has done work flows in from the L port of the pure water plunger motor through the oil pipe connected to the B port of the valve body. The B port is connected to the balance valve II. The low-pressure return liquid flows to the hydraulic reversing valve II through the balance valve II. The working port of the hydraulic reversing valve II is connected to the return liquid port T of the valve body under normal conditions, that is, the low-pressure water flows out from the return liquid port T and enters the oil tank or is discharged externally; Lift the handle on the right side of the manual pilot valve, and the pilot fluid controls the hydraulic reversing valve II to switch and open, so that the high-pressure water passes through the hydraulic reversing valve II and is divided into three parts through the internal channel of the valve body: a small part opens the shuttle valve through the channel and enters the directional valve, so that the directional valve switches and opens to pass the liquid, and then comes out from the K port of the valve body and communicates with the BK port of the normally closed brake through the oil pipe. The high-pressure water opens the brake and releases the restriction on the pure water plunger motor, that is, the brake is released; another small part is connected with the pressure guide port of the balance valve I through the channel; another large part flows into the B port of the valve body through the balance valve II, and the high-pressure liquid is connected with the L port of the pure water plunger motor through the oil pipe from the B port as the liquid inlet, so that the pure water plunger motor rotates after the restriction is released; The low-pressure water that has done work flows in from the R port of the pure water plunger motor through the oil pipe and is connected to the A port of the valve body. The A port is connected to the balancing valve I. The low-pressure return liquid flows to the hydraulic reversing valve I through the balancing valve I. Under normal circumstances, the working port of the hydraulic reversing valve I is connected to the return liquid port T port of the valve body, that is, the low-pressure water flows out from the return liquid port T port and enters the oil tank or is discharged externally.

2. A pure water medium hydraulic chain tightening device according to claim 1, characterized in that: The shuttle valve is also connected to a pressure gauge II.

3. A pure water medium hydraulic chain tightening device according to claim 1, characterized in that: A one-way valve is arranged between the manual pilot valve and the hydraulic reversing valve I and the hydraulic reversing valve II.

4. A pure water medium hydraulic chain tightening device according to claim 1, characterized in that: The reducer includes a reducer housing, in which a reduction output shaft and a gear transmission shaft connected in sequence are arranged in a horizontal direction, a reducer front cover is coaxially installed on the reduction output shaft, a first-stage planetary reduction gear assembly and a second-stage planetary reduction gear assembly are respectively installed on the gear transmission shaft, the second-stage planetary reduction gear assembly is connected to the reducer front cover, the first-stage planetary reduction gear assembly is connected to the brake, and a first-stage planetary internal gear ring and a second-stage planetary internal gear ring are respectively arranged at both ends of the inner wall of the reducer housing, the first-stage planetary internal gear ring is meshed with the first-stage planetary reduction gear assembly, and the second-stage planetary internal gear ring is meshed with the second-stage planetary reduction gear assembly.

5. A pure water medium hydraulic chain tightening device according to claim 4, characterized in that: The first-stage planetary reduction gear assembly includes a first-stage planet carrier installed on the gear transmission shaft, the first-stage planet carrier is connected to the gear transmission shaft through a spline, and at least three groups of first-stage planetary gears are evenly distributed on the first-stage planet carrier; the first-stage planetary gears are meshed with the first-stage planetary inner gear ring.

6. A pure water medium hydraulic chain tightening device according to claim 5, characterized in that: The secondary planetary reduction gear assembly includes a secondary planet carrier installed on the gear transmission shaft, and at least three groups of secondary planetary gears are evenly distributed on the secondary planet carrier; the primary planetary gear is meshed with the primary planetary inner gear ring, and an output gear is provided on the gear transmission shaft. The output gear serves as the output gear of the secondary planetary reduction gear assembly and is meshed with the secondary planetary gear; the secondary planet carrier is connected to one end of the reduction output shaft through a spline.

7. A pure water medium hydraulic chain tightening device according to claim 6, characterized in that: The brake comprises a brake shaft, one end of which passes through an end cover and is connected to a gear transmission shaft, and the other end of the brake shaft is coaxially mounted with a rear end cover; a friction plate assembly and a brake cylinder are coaxially mounted on the brake shaft in sequence, a brake piston is arranged in the brake cylinder, and a bushing is coaxially mounted between the brake piston and the brake cylinder; a plurality of spring mounting holes are evenly distributed on one side of the brake piston close to the rear end cover, and a spring is arranged in the spring mounting hole.

8. A chain tightening method for a pure water medium hydraulic chain tightening device according to claims 1 to 7, characterized in that: The specific steps include: Step 1, pure water high pressure liquid enters the pure water medium hydraulic chain tightening device from P, the stop valve is opened, the high pressure water flows through the filter B to filter out impurities, and enters the pressure reducing valve, and the original 31.5MPa high pressure water is reduced to within 5-16MPa according to the actual working conditions. The pressure after decompression is the system working pressure of the pure water hydraulic chain tightening device, and at the same time, the pressure gauge I displays the reduced pressure; Step 2, the decompressed water flows out from the outlet of the pressure reducing valve and enters the pure water motor hydraulic system valve; Step 3, operate the manual pilot valve 3 on the pure water motor hydraulic system valve to control the brake to release the brake and the pure water high-speed plunger motor to rotate. The pure water high-speed plunger motor outputs power to the reducer, and after passing through the reducer, it drives the scraper conveyor through the gear box to tighten the chain; Step 4: After driving the scraper conveyor to reversely drag the chain to the set length, operate the manual pilot valve to stop the pure water high-speed plunger motor and brake it at the same time to keep the chain tight. The worker then enters the chain cutting and connecting process. Step 5, after the chain is cut and connected, operate the manual pilot to control the brake to release the brake and the pure water high-speed plunger motor to rotate, drive the reducer, and then drive the scraper conveyor to rotate forward and reverse through the gear box to release the tension on the chain, that is, relax the chain; Step 6. After the chain tension is released, stop operating the manual pilot valve, apply the brake, stop the pure water high-speed plunger motor, and finally close the stop valve, stop the system fluid supply, and cut off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor. The scraper conveyor chain tightening work is completed.

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