阅读说明：本技术 一种纯水介质液压紧链装置及其紧链方法 (Pure water medium hydraulic chain tightening device and chain tightening method thereof ) 是由 柯超 任发勋 王文静 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种纯水介质液压紧链装置,包括连接板,连接板上设有纯水马达液压系统阀,纯水马达液压系统阀上设有手动先导阀；纯水马达液压系统阀的一侧还设有减压阀,减压阀与纯水马达液压系统阀之间设有压力表I,减压阀的一侧还设有截止阀,截止阀与减压阀之间设有过滤器B,纯水马达液压系统阀还连接制动器,制动器分别连接减速器和纯水柱塞马达。本发明还公开了一种纯水介质液压紧链装置的紧链方法。解决了普通液压紧链器无法使用纯水工作介质的问题,实现了纯水介质条件下液压紧链装置安全可靠的运行。(The invention discloses a pure water medium hydraulic chain tightening device which comprises a connecting plate, wherein a pure water motor hydraulic system valve is arranged on the connecting plate, and a manual pilot valve is arranged on the pure water motor hydraulic system valve; one side of the pure water motor hydraulic system valve is also provided with a pressure reducing valve, a pressure gauge I is arranged between the pressure reducing valve and the pure water motor hydraulic system valve, one side of the pressure reducing valve is also provided with a stop valve, a filter B is arranged between the stop valve and the pressure reducing valve, the pure water motor hydraulic system valve is also connected with a brake, and the brake is respectively connected with a speed reducer and a pure water plunger motor. The invention also discloses a chain tightening method of the pure water medium hydraulic chain tightening device. The problem that a common hydraulic chain tightener cannot use a pure water working medium is solved, and safe and reliable operation of the hydraulic chain tightener under the condition of the pure water medium is realized.)

1. The utility model provides a tight chain device of pure water medium hydraulic pressure which characterized in that: the water purifier comprises a connecting plate, wherein a pure water motor hydraulic system valve is arranged on the connecting plate, and a manual pilot valve is arranged on the pure water motor hydraulic system valve; one side of the pure water motor hydraulic system valve is also provided with a pressure reducing valve, a pressure gauge I is arranged between the pressure reducing valve and the pure water motor hydraulic system valve, the pressure reducing valve is also connected with a filter B, the pure water motor hydraulic system valve is also connected with a brake, and the brake is respectively connected with a speed reducer and a pure water plunger motor.

2. The pure water medium hydraulic chain tightening device according to claim 1, characterized in that: the pure water motor hydraulic system valve comprises a valve body, wherein a liquid inlet P is formed in the valve body, the liquid inlet P is sequentially communicated with a filter A, a manual pilot valve, a hydraulic reversing valve I and a hydraulic reversing valve II, the hydraulic reversing valve I is sequentially communicated with a shuttle valve and a direction valve, the direction valve is respectively communicated with a balance valve II and a balance valve I, the balance valve II is communicated with the hydraulic reversing valve II, the balance valve I is communicated with the hydraulic reversing valve I, and the hydraulic reversing valve I and the hydraulic reversing valve II are communicated with a liquid return port T of the valve body.

3. The pure water medium hydraulic chain tightening device according to claim 2, characterized in that: the shuttle valve is also communicated with a pressure gauge II.

4. The pure water medium hydraulic chain tightening device according to claim 2, characterized in that: and a one-way valve is arranged between the manual pilot valve and the hydraulic reversing valve I and between the manual pilot valve and the hydraulic reversing valve II.

5. The pure water medium hydraulic chain tightening device according to claim 1, characterized in that: and a stop valve is also arranged between the pressure reducing valve and the filter B.

6. The pure water medium hydraulic chain tightening device according to claim 1, characterized in that: the speed reducer comprises a speed reducer shell, a speed reduction output shaft and a gear transmission shaft which are sequentially connected are arranged in the speed reducer shell along the horizontal direction, a speed reducer front cover is coaxially arranged on the speed reduction output shaft, a primary planetary speed reduction gear assembly and a secondary planetary speed reduction gear assembly are respectively arranged on the gear transmission shaft, the secondary planetary speed reduction gear assembly is connected with the speed reducer front cover, the primary planetary speed reduction gear assembly is connected with a brake, a primary planetary inner gear ring and a secondary planetary inner gear ring are respectively arranged at two ends of the inner wall of the speed reducer shell, the primary planetary inner gear ring is meshed with the primary planetary speed reduction gear assembly.

7. The pure water medium hydraulic chain tightening device according to claim 6, characterized in that: the primary planetary reduction gear assembly comprises a primary planetary carrier arranged on a gear transmission shaft, the primary planetary carrier is connected with the gear transmission shaft through a spline, and at least three groups of primary planetary gears are uniformly distributed on the primary planetary carrier; the primary planet gear is meshed with the primary planet inner gear ring.

8. The pure water medium hydraulic chain tightener of claim 7, characterized in that: the secondary planetary reduction gear assembly comprises a secondary planet carrier arranged on the gear transmission shaft, and at least three groups of secondary planetary gears are uniformly distributed on the secondary planet carrier; the first-stage planetary gear is meshed with the first-stage planetary inner gear ring, an output gear is arranged on the gear transmission shaft, and the output gear is meshed with the second-stage planetary gear as an output gear of the second-stage planetary reduction gear assembly; the second-stage planet carrier is connected with one end of the speed reduction output shaft through a spline.

9. The pure water medium hydraulic chain tightener of claim 8, characterized in that: the brake comprises a brake shaft, one end of the brake shaft penetrates through the end cover to be connected with the gear transmission shaft, and the other end of the brake shaft is coaxially provided with a rear end cover; a friction plate assembly and a brake cylinder are coaxially arranged on the brake shaft in sequence, a brake piston is arranged in the brake cylinder, and a bushing is coaxially arranged between the brake piston and the brake cylinder; one side of the brake piston close to the rear end cover is uniformly provided with a plurality of spring mounting holes, and springs are arranged in the spring mounting holes.

10. The chain tightening method of the pure water medium hydraulic chain tightening device according to claims 1-9, characterized in that: the method specifically comprises the following steps:

step 1, allowing pure water high-pressure liquid to enter a pure water medium hydraulic chain tightening device from P, opening a stop valve, filtering impurities from high-pressure water flow through a filter B, allowing the high-pressure water flow to enter a pressure reducing valve, reducing the original 31.5MPa high-pressure water to be within 5-16MPa according to actual working conditions, wherein the reduced pressure is the system working pressure of the pure water hydraulic chain tightening device, and meanwhile, a pressure gauge I displays the reduced pressure;

step 2, the decompressed water flows out of an outlet of the pressure reducing valve and enters a pure water motor hydraulic system valve;

step 3, operating a manual pilot valve 3 on a hydraulic system valve of the pure water motor, controlling a brake to release braking and the pure water high-speed plunger motor to rotate, outputting power to a speed reducer by the pure water high-speed plunger motor, and driving a scraper conveyor to tighten the chain through a gear box after the power passes through the speed reducer;

step 4, after the scraper conveyor is driven to reversely drag the chain to be stacked to a set length, operating the manual pilot valve to stop the pure water high-speed plunger motor to rotate and brake simultaneously, keeping a chain tightening state, and enabling workers to enter a chain cutting and connecting process;

step 5, after chain cutting and chain connecting are completed, operating a manual pilot to control a brake to release braking and a pure water high-speed plunger motor to rotate so as to drive a speed reducer, further driving a scraper conveyor to rotate forwards and backwards through a gear box, and releasing tension of a chain, namely loosening the chain;

and 6, after the tension of the chain is released, stopping operating the manual pilot valve, braking by the brake, stopping running the pure water high-speed plunger motor, finally closing the stop valve, stopping supplying liquid to the system, and cutting off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor, so that the chain tightening work of the scraper conveyor is completed.

Technical Field

The invention belongs to the technical field of hydraulic control and transmission, relates to a pure water medium hydraulic chain tightening device, and further relates to a chain tightening method of the device.

Background

Nowadays, as the requirements of the human society on environmental protection, sustainable development, safe production and the like are continuously improved, the water hydraulic transmission becomes a new development trend of the hydraulic technology due to the outstanding characteristics of flame retardance, greenness, cleanness, energy conservation and the like. With the requirements of construction and environmental protection of green mines, the demand of hydraulic products for pure water media is more and more.

At present, the underground high-power scraper conveyor and the reversed loader both adopt hydraulic motor chain tighteners which are all emulsion working media, and have simple structures, but have a plurality of defects in the actual use process: 1. the valve of the hydraulic control system is easy to rust and cannot work; 2. the hydraulic control valve group and the motor are prone to failure and have abnormal sound; 3. the service life of the hydraulic motor is low, and the working efficiency is low; 4. the torque of the hydraulic chain tightening device is low; 5. cannot adapt to pure water working medium; 6. continuous operation cannot be achieved.

Disclosure of Invention

The invention aims to provide a pure water medium hydraulic chain tightening device, which solves the problem that a common hydraulic chain tightening device cannot use a pure water working medium and realizes safe and reliable operation of the hydraulic chain tightening device under the condition of the pure water medium.

The invention also provides a chain tightening method of the pure water medium hydraulic chain tightening device.

The invention adopts a first technical scheme that the pure water medium hydraulic chain tightening device comprises a connecting plate, wherein a pure water motor hydraulic system valve is arranged on the connecting plate, and a manual pilot valve is arranged on the pure water motor hydraulic system valve; one side of the pure water motor hydraulic system valve is also provided with a pressure reducing valve, a pressure gauge I is arranged between the pressure reducing valve and the pure water motor hydraulic system valve, the pressure reducing valve is also connected with a filter B, the pure water motor hydraulic system valve is also connected with a brake, and the brake is respectively connected with a speed reducer and a pure water plunger motor.

The first technical scheme of the invention is also characterized in that:

the pure water motor hydraulic system valve comprises a valve body, wherein a liquid inlet P is formed in the valve body, the liquid inlet P is sequentially communicated with a filter A, a manual pilot valve, a hydraulic reversing valve I and a hydraulic reversing valve II, the hydraulic reversing valve I is sequentially communicated with a shuttle valve and a direction valve, the direction valve is respectively communicated with a balance valve II and the balance valve I, the balance valve II is communicated with the hydraulic reversing valve II, the balance valve I is communicated with the hydraulic reversing valve I, and the hydraulic reversing valve I and the hydraulic reversing valve II are communicated with a liquid return port T of the valve body.

The shuttle valve is also communicated with a pressure gauge II.

And a one-way valve is arranged between the manual pilot valve and the hydraulic reversing valve I and between the manual pilot valve and the hydraulic reversing valve II.

A stop valve is also arranged between the pressure reducing valve and the filter B.

The speed reducer comprises a speed reducer shell, a speed reduction output shaft and a gear transmission shaft which are sequentially connected are arranged in the speed reducer shell along the horizontal direction, a speed reducer front cover is coaxially arranged on the speed reduction output shaft, a primary planetary speed reduction gear assembly and a secondary planetary speed reduction gear assembly are respectively arranged on the gear transmission shaft, the secondary planetary speed reduction gear assembly is connected with the speed reducer front cover, the primary planetary speed reduction gear assembly is connected with a brake, a primary planetary inner gear ring and a secondary planetary inner gear ring are respectively arranged at two ends of the inner wall of the speed reducer shell, the primary planetary inner gear ring is meshed with the primary planetary speed reduction gear.

The first-stage planetary reduction gear assembly comprises a first-stage planetary carrier arranged on a gear transmission shaft, the first-stage planetary carrier is connected with the gear transmission shaft through a spline, and at least three groups of first-stage planetary gears are uniformly distributed on the first-stage planetary carrier; the primary planet gear is meshed with the primary planet inner gear ring.

The second-stage planetary reduction gear assembly comprises a second-stage planet carrier arranged on the gear transmission shaft, and at least three groups of second-stage planetary gears are uniformly distributed on the second-stage planet carrier; the first-stage planetary gear is meshed with the first-stage planetary inner gear ring, an output gear is arranged on the gear transmission shaft, and the output gear is meshed with the second-stage planetary gear as an output gear of the second-stage planetary reduction gear assembly; the second-stage planet carrier is connected with one end of the speed reduction output shaft through a spline.

The brake comprises a brake shaft, one end of the brake shaft penetrates through the end cover to be connected with the gear transmission shaft, and the other end of the brake shaft is coaxially provided with a rear end cover; a friction plate assembly and a brake cylinder are coaxially arranged on the brake shaft in sequence, a brake piston is arranged in the brake cylinder, and a bushing is coaxially arranged between the brake piston and the brake cylinder; one side of the brake piston close to the rear end cover is uniformly provided with a plurality of spring mounting holes, and springs are arranged in the spring mounting holes.

The second technical scheme adopted by the invention is that the chain tightening method of the pure water medium hydraulic chain tightening device specifically comprises the following steps:

step 1, allowing pure water high-pressure liquid to enter a pure water medium hydraulic chain tightening device from P, opening a stop valve, filtering impurities from high-pressure water flow through a filter B, allowing the high-pressure water flow to enter a pressure reducing valve, reducing the original 31.5MPa high-pressure water to be within 5-16MPa according to actual working conditions, wherein the reduced pressure is the system working pressure of the pure water hydraulic chain tightening device, and meanwhile, a pressure gauge I displays the reduced pressure;

step 2, the decompressed water flows out of an outlet of the pressure reducing valve and enters a pure water motor hydraulic system valve;

step 3, operating a manual pilot valve 3 on a hydraulic system valve of the pure water motor, controlling a brake to release braking and the pure water high-speed plunger motor to rotate, outputting power to a speed reducer by the pure water high-speed plunger motor, and driving a scraper conveyor to tighten the chain through a gear box after the power passes through the speed reducer;

step 4, after the scraper conveyor is driven to reversely drag the chain to be stacked to a set length, operating the manual pilot valve to stop the pure water high-speed plunger motor to rotate and brake simultaneously, keeping a chain tightening state, and enabling workers to enter a chain cutting and connecting process;

step 5, after chain cutting and chain connecting are completed, operating a manual pilot to control a brake to release braking and a pure water high-speed plunger motor to rotate so as to drive a speed reducer, further driving a scraper conveyor to rotate forwards and backwards through a gear box, and releasing tension of a chain, namely loosening the chain;

and 6, after the tension of the chain is released, stopping operating the manual pilot valve, braking by the brake, stopping running the pure water high-speed plunger motor, finally closing the stop valve, stopping supplying liquid to the system, and cutting off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor, so that the chain tightening work of the scraper conveyor is completed.

The invention has the beneficial effects that the invention adopts the pressure reducing valve and the mandatory filter structure which are made of the stainless steel and have strong pollution resistance, thereby ensuring the cleanness of pure water medium and high pressure liquid with constant pressure value; secondly, a manual pilot control mode and a unique hydraulic control loop design are adopted, and the key is that a bidirectional balance and bidirectional locking loop is adopted to form oil path interlocking and balance to ensure that the hydraulic motor operates stably and brakes, and stall and accidents are prevented. An independent hydraulic control braking loop is designed, double hydraulic and mechanical braking is provided, and the safety and reliability of operation are ensured; the hydraulic motor adopts a high-speed plunger motor which is suitable for pure water medium and can continuously work, so that the continuous work of the hydraulic chain tightening device is ensured; the motor is also provided with a speed reducer and a brake structure, so that the working output torque and the impact resistance are improved, and meanwhile, a mechanical braking mode is added, so that the continuous working, large torque output, impact resistance and timely braking functions can be realized; and finally, the hydraulic control system and the key components are made of stainless steel or copper materials, so that system elements are suitable for pure water media, and the reliability, stability and safety of the device are ensured.

Drawings

FIG. 1 is a schematic structural diagram of a pure water medium hydraulic chain tightening device according to the present invention;

FIGS. 2(a) - (c) are schematic views of the valve structures of the pure water motor hydraulic system in the pure water medium hydraulic chain tightening device according to the present invention;

FIG. 3 is a schematic structural diagram of the connection between the speed reducer and the brake in the hydraulic chain tightener with pure water medium according to the present invention;

fig. 4 is a sectional view taken in the direction C-C in fig. 3.

In the figure, 1, a connecting plate;

2. a pure water motor hydraulic system valve, 201, pressure gauges II, 202, balance valves I, 203, a valve body, 3, a manual pilot valve, 204, balance valves II, 205, a one-way valve, 206, hydraulic reversing valves I, 207, hydraulic reversing valves II, 208, a direction valve, 209, a shuttle valve, 210 and a filter A;

3. a manual pilot valve; 4. a pressure gauge I; 5. a pressure reducing valve; 6. a filter B; 7. a stop valve;

8. a speed reducer; 801. a deceleration output shaft; 802. a reducer front cover; 803. a secondary planet carrier; 804. a secondary planetary gear; 805. a reducer housing; 806. a secondary planet inner gear ring; 807. a gear transmission shaft; 808. a primary planet carrier; 809. a primary planetary gear; 810. a primary planet inner gear ring;

9. 9-1 parts of a brake, 9-2 parts of an end cover and 9-2 parts of a brake shaft; 9-3. a friction plate assembly; 9-4, a brake cylinder; 9-5. a bushing; 9-6, brake piston; 9-7. a spring; 9-8, a rear end cover;

10. a pure water plunger motor.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention relates to a pure water medium hydraulic chain tightening device, which comprises a connecting plate 1, wherein a pure water motor hydraulic system valve 2 is arranged on the connecting plate 1, and a manual pilot valve 3 is arranged on the pure water motor hydraulic system valve 2; one side of the pure water motor hydraulic system valve 2 is also provided with a pressure reducing valve 5, a pressure gauge I4 is arranged between the pressure reducing valve 5 and the pure water motor hydraulic system valve 2, one side of the pressure reducing valve 5 is also provided with a stop valve 7, a filter B6 is arranged between the stop valve 7 and the pressure reducing valve 5, the pure water motor hydraulic system valve 2 is also connected with a brake 9, and the brake 8 is respectively connected with a speed reducer 8 and a pure water plunger motor 10.

As shown in fig. 2(a) - (c) (fig. 2(a) is a perspective view, fig. 2(b) is a left side view, fig. 2(c) is a right side view), the pure water motor hydraulic system valve 2 includes a valve body 203, a liquid inlet P is arranged on the valve body 203, the liquid inlet P is sequentially communicated with a filter a2-10, a manual pilot valve 3, a hydraulic reversing valve I206 and a hydraulic reversing valve II207, the hydraulic reversing valve I206 is sequentially communicated with a shuttle valve 209 and a directional valve 208, the directional valve 208 is respectively communicated with a balance valve II204 and a balance valve I202, the balance valve II204 is communicated with the hydraulic reversing valve II207, the balance valve I202 is communicated with the hydraulic reversing valve I206, and the hydraulic reversing valve I206 and the hydraulic reversing valve II207 are both communicated with a liquid return port T of the valve body 202.

Shuttle valve 209 is also in communication with pressure gauge II 201.

A one-way valve 205 is arranged between the manual pilot valve 3 and the hydraulic reversing valve I206 and the hydraulic reversing valve II 207.

The filter a210 is a cartridge type pilot filter element.

As shown in fig. 3, the decelerator 8 includes a decelerator housing 805, a deceleration output shaft 801 and a gear transmission shaft 807 are arranged in the decelerator housing 805 along a horizontal direction, the deceleration output shaft 801 is coaxially provided with a decelerator front cover 802, the gear transmission shaft 807 is respectively provided with a primary planetary deceleration gear assembly and a secondary planetary deceleration gear assembly, the secondary planetary deceleration gear assembly is connected with the decelerator front cover 802, the primary planetary deceleration gear assembly is connected with the brake 9, two ends of an inner wall of the decelerator housing 805 are respectively provided with a primary planetary inner gear ring 810 and a secondary planetary inner gear ring 806, the primary planetary inner gear ring 810 is engaged with the primary planetary deceleration gear assembly, and the secondary planetary inner gear ring 806 is engaged with the secondary planetary deceleration.

The primary planetary reduction gear assembly comprises a primary planet carrier 808 arranged on a gear transmission shaft, the primary planet carrier 808 is connected with the gear transmission shaft 809 through a spline, and at least three groups of primary planet gears 809 are uniformly distributed on the primary planet carrier 808; the primary planet gears 809 are meshed with a primary planet ring gear 810.

The secondary planetary reduction gear assembly comprises a secondary planet carrier 803 arranged on a gear transmission shaft 807, and at least three groups of secondary planet gears 804 are uniformly distributed on the secondary planet carrier 803; the primary planet gear 809 is meshed with a primary planet inner gear ring 810, an output gear is arranged on the gear transmission shaft 807, and the output gear is meshed with the secondary planet gear 804 as an output gear of the secondary planet reduction gear assembly; the secondary planet carrier 803 is connected with one end of the reduction output shaft 801 through a spline;

the brake 9 comprises a brake shaft 9-2, one end of the brake shaft 9-2 penetrates through an end cover 9-1 to be connected with the gear transmission shaft 807, and the other end of the brake shaft 9-2 is coaxially provided with a rear end cover 9-8; a friction plate assembly 9-3 and a brake cylinder 9-4 are coaxially mounted on the brake shaft 9-2 in sequence, a brake piston 9-6 is arranged in the brake cylinder 9-4, and a bushing 9-5 is coaxially mounted between the brake piston 9-6 and the brake cylinder 9-4; a plurality of spring mounting holes are uniformly distributed on one side of the brake piston 9-6 close to the rear end cover 9-8, and springs 9-7 are arranged in the spring mounting holes. The reducer front cover 802 is connected with the reduction output shaft 801, the reducer housing 805 and the end cover 9-1 as an integral structure.

The working principle of the pure water medium hydraulic chain tightening device is that when a chain of a scraper conveyor needs to be tightened, a power supply of a main machine of the scraper conveyor is cut off, a chain stopper is arranged on a chute, and pure water high-pressure liquid is supplied after a gear box is meshed in place. The pure water high-pressure liquid enters the pure water medium hydraulic chain tightening device from P, the stop valve 7 is opened, high-pressure water flows through the filter B6 to filter impurities, the high-pressure water flows into the pressure reducing valve 5, the original 31.5MPa high-pressure water is reduced to the range of 5-16MPa according to the actual working condition, and the 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 of the decompressed high-pressure water enters a pressure gauge I4 through a tee joint, namely the pressure gauge I4 displays the system working pressure of the pure water hydraulic chain tightening device. Another most part gets into the inlet P of pure water motor hydraulic control system valve body 203, and this valve body 203 is installing all components and technology stifled, and each component corresponds the intercommunication through the interior through-hole of valve body 203, and high-pressure liquid has divided into two parts again simultaneously: a small part of the impurities are filtered by the filter A210 and enter the manual pilot valve 3, and the small part of the impurities are communicated through an inner hole of the valve body 203 and serve as pilot control liquid of the hydraulic reversing valve I206 and the hydraulic reversing valve II 207; most of the oil enters working ports of the hydraulic reversing valve I206 and the hydraulic reversing valve II207, and the hydraulic reversing valve I206 and the hydraulic reversing valve II207 are in a closed state at the moment.

The control valve is operated to drive the motor to rotate positively and negatively, and the positive and negative rotation is only relative:

(1) controlling motor to rotate forward

The handle on the left side of the manual pilot valve 3 is operated to lift, the pilot liquid control hydraulic reversing valve I206 is reversed and opened, and high-pressure water is divided into three parts by the pore passage inside the valve body 203 after passing through the hydraulic reversing valve I206: a small part of the pure water enters the direction valve 208 by opening the shuttle valve 209 through a pore passage, so that the direction valve 208 is opened to open the liquid, then the liquid comes out of the K port of the valve body 203 and is communicated with a BK port of the (normally closed) brake 9 through an oil pipe, and the (normally closed) brake 9 is opened by high-pressure water to remove the limitation of the (normally closed) brake 9 on the pure water plunger motor 10, namely the brake is removed; a small part of the balance valve II is communicated with a pressure guide port of the balance valve II204 through a pore channel, and the balance valve II204 is controlled to generate certain back pressure according to a fixed pressure guide ratio and open a smooth liquid return loop because the balance valve II has the functions of bidirectional balance and bidirectional locking when used in pairs; the other most part of the high-pressure liquid flows into the port A of the valve body 203 from the balance valve I202, the port A is communicated with the port R of the pure water plunger motor 10 through an oil pipe to be used as a liquid inlet, the pure water plunger motor 10 rotates after the limitation is removed, and the port L is used as a liquid return port, and the liquid inlet and the oil return ports are opposite. The low-pressure water which has done work flows in through the L port of the pure water plunger motor 10 and the B port of the valve body 203 through the oil pipe, the B port is communicated with the balance valve II204, the low-pressure return liquid flows to the hydraulic reversing valve II207 through the balance valve II204, the working port of the hydraulic reversing valve II207 is connected with the T port of the return liquid port of the valve body 203 under the normal state, namely, the low-pressure water flows out through the T port of the return liquid and enters an oil tank or is discharged outside.

(2) Controlling motor reversal

The handle on the right side of the manual pilot valve 3 is operated to lift, the pilot liquid control hydraulic reversing valve II204 is reversed and opened, and high-pressure water is divided into three parts by the internal pore channel of the valve body 203 after passing through the hydraulic reversing valve II 207: a small part of the pure water enters the direction valve 208 by opening the shuttle valve 209 through a pore passage, so that the direction valve 208 is opened to open the liquid, then the liquid comes out of the K port of the valve body 203 and is communicated with the BK port of the normally closed brake 9 through an oil pipe, the (normally closed) brake 9 is opened by high-pressure water, and the limitation of the (normally closed) brake 9 on the pure water plunger motor 10 is removed, namely the brake is removed; a small part of the balance valve I202 is communicated with a pressure guide port of the balance valve I202 through a pore channel, and the balance valve I202 is controlled to generate certain back pressure according to a fixed pressure guide ratio and open a smooth liquid return loop because the balance valve has the functions of bidirectional balance and bidirectional locking when used in pairs; the other most part of the high-pressure liquid flows into the port B of the valve body 203 through the balance valve II207, the port B is communicated with the port L of the pure water plunger motor 10 through an oil pipe to be used as a liquid inlet, the pure water plunger motor 10 rotates after the limitation is removed, and the port R is used as a liquid return port, and the liquid inlet and the oil return ports are opposite. The low-pressure water which has done work flows in through the connection of the R port of the pure water plunger motor 10 and the A port of the valve body 203 through the oil pipe, the A port is communicated with the balance valve I202, the low-pressure return liquid flows to the hydraulic reversing valve I206 through the balance valve I202, the working port of the hydraulic reversing valve I206 is connected with the T port of the return liquid port of the valve body 203 under the normal state, namely, the low-pressure water flows out through the T port of the return liquid port and enters the oil tank or is discharged outside.

Brake speed reducing mechanism

The (normally closed) brake 9 comprises 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 the like.

The end cover 9-1 is connected with the brake cylinder 9-4 and the brake shaft 9-2, meanwhile, an external spline and an output gear are arranged on the brake shaft 9-2, and an internal spline and a BK port are arranged on the brake cylinder 9-4. A plurality of groups of friction plates and steel sheets are arranged in the friction plate assembly 9-3 and overlapped to form a gap with relative movement, the friction plates are connected with the brake shaft 9-2, and the steel sheets of the friction plate assembly 9-3 are connected with an inner spline of the brake cylinder 9-4. And the lining 9-5 and the brake piston 9-6 are combined and then connected with the brake cylinder 9-4, a sealed cavity is formed after sealing is arranged, the brake piston 9-6 can reciprocate linearly, a plurality of spring mounting holes are formed in the back side of the brake piston 9-6, and the spring 9-7 is mounted on the back side of the brake piston 9-6. And finally, the rear end cover 9-8 is connected with 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 enough thrust to push the brake piston 9-6 to move towards the friction plate assembly 9-3 and press the friction plate assembly 9-3 tightly, so that the friction plate and the steel plate in the friction plate assembly 9-3 generate enough friction force after receiving positive pressure, the friction plate and the steel plate cannot generate relative motion, and the brake torque is generated. When the BK port of the normally closed brake 9 is not supplied with the high-pressure fluid, the brake is in a braking state.

The reducer 8 and the brake 9 share an end cover 9-1 and are connected together, at the moment, a brake shaft 9-2 is inserted and meshed with a primary planetary gear 809, three groups of primary planetary gears 809 are uniformly distributed at 120 degrees and connected to a primary planet carrier 808 and independently rotate (shown as a sectional view in fig. 4C-C), and the primary planetary gear 809 is meshed with a primary planetary ring gear 810. Furthermore, the primary planet carrier 808 is provided with an internal spline and is matched and connected with the gear transmission shaft 807, the gear transmission shaft 807 is provided with an output gear and is used as an input gear to be meshed with the secondary planet gears 804, 4 groups (generally 3-5 groups) of secondary planet gears 804 are uniformly distributed and connected on the secondary planet carrier at 90 degrees and independently rotate, and meanwhile, the secondary planet gears 804 are meshed with the secondary planet internal gear ring 806. The second-stage carrier 803 is provided with an internal spline and is connected to one end of the reduction output shaft 801, and the reduction front cover 802 is connected to the reduction output shaft 801, the reduction case 805, the end cover 810, and the like to form a fixed whole. The last stage planetary gear 809 and the second stage planetary gear 804 travel on the respective gear rings to generate deceleration and increase torque, and finally, the deceleration output shaft 801 outputs the torque and the rotating speed.

(2) Working principle of motor chain tightening

When the BK port of the normally closed brake 9 and the R port or the L port of the pure water plunger motor 10 are supplied with high-pressure water: firstly, a closed cavity formed by a brake cylinder 9-4, a bushing 9-5 and a brake piston 9-6 in a normally closed brake 9 generates thrust on the brake piston 9-6, overcomes the elastic force of a spring 9-7 to push the brake piston to move in the opposite direction and compress the spring 9-7, releases the pressure on a friction plate assembly 9-3, further generates a gap between the friction plate and a steel plate and eliminates the friction force, and becomes a free state, namely, the brake is released. Meanwhile, the pure water plunger motor 10 is arranged on the rear end cover 9-8, the output shaft of the pure water plunger motor is connected with the brake shaft 9-2, the pure water plunger motor is driven by high-pressure water to generate rotation and torque, the brake shaft 9-2 is driven to operate to transmit power to the primary planetary gear 809, and the primary planetary gear 809 are meshed to move so as to reduce the speed and increase the torque. The decelerated power is transmitted to a gear transmission shaft 807 through a primary planet carrier 808, and is engaged with a secondary planet gear 804 through the gear transmission shaft 807 to be used as power input, and the secondary planet gear 804 is engaged with a secondary planet inner gear ring 806 to move so as to decelerate again and increase torque. After the two-stage speed reduction is completed, the power is transmitted to the speed reduction output shaft 801 by the two-stage planet carrier 803, and the output reaches the required torque and rotating speed. And finally, the chain tightener is connected with a scraper conveyor to drive the scraper conveyor to rotate forwards and backwards (wherein, as long as one end of an R port and an L port of the pure water plunger motor 10 is fed with liquid, the other end of the R port and the L port are changed into returned liquid), and chain tightening or chain loosening is finished.

The total reduction ratio is the product of the reduction ratios of the primary planet gears 809 and the secondary planet gears 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 rotation speed can be reduced by 10 to 100 times.

When the BK port of the normally closed brake 9 stops the high-pressure water from the R port or the L port of the pure water plunger motor 10: firstly, a closed cavity formed by a brake cylinder 9-4, a bush 9-5 and a brake piston 9-6 in a normally closed brake 9 loses pressure and loses thrust on the brake piston 9-6, so that the brake piston 9-6 generates strong thrust for rebounding due to the compression of a spring 9-7, the brake piston rapidly compresses a friction plate assembly 9-3, further a gap between the friction plate and a steel sheet is eliminated, and friction force is generated to cause that relative movement cannot be generated, so that brake torque is generated, namely the power output of a pure water (high-speed) plunger motor 10 is limited by braking. Meanwhile, the scraper conveyor loses power due to pressure loss, stops running, and finally can start and stop running of the scraper conveyor.

The method comprises the following steps:

when the chain of the scraper conveyor needs to be tightened, the power supply of the main machine of the scraper conveyor is cut off, all pipelines are connected in a one-to-one correspondence mode according to the figure 1, meanwhile, the chain stopper is installed on the chute, and pure water high-pressure liquid is supplied after the gear box is meshed in place.

The invention relates to a chain tightening method of a pure water medium hydraulic chain tightening device, which specifically comprises the following steps:

1. pure water high-pressure liquid enters the pure water medium hydraulic chain tightening device from P, the stop valve 7 is opened, high-pressure water flows pass through the filter B6 to filter impurities, the pure water enters the pressure reducing valve 5, the original 31.5MPa high-pressure water is reduced to be within 5-16MPa according to actual working conditions, namely the pressure is the system working pressure of the pure water hydraulic chain tightening device, the pure water high-pressure liquid is generally set before leaving a factory, and meanwhile, the pressure gauge I4 displays the pressure.

2. The decompressed high-pressure water flows out from the outlet of the pressure reducing valve 5 and enters a pure water motor hydraulic control system valve, and all elements and process plugs required by the work are installed.

3. The manual pilot valve 3 on the operation pure water motor hydraulic control system valve according to actual demand, handle about operating manual pilot valve 3, control closed stopper 9 and remove braking and pure water plunger motor 10 and rotate, and pure water plunger motor 10 gives reduction gear 8 with power take off, obtains suitable moment of torsion and rotational speed after reduction gear 8, and rethread gear box drive scraper conveyor carries out tight chain to the chain.

4. When the scraper conveyor is driven to drag the chain to be stacked to a proper length in a reverse mode, the manual pilot valve 3 is operated to stop the pure water plunger motor 10 from rotating, the normally closed brake 9 is used for braking simultaneously, the chain tightening state is kept, and workers enter the chain cutting and connecting process.

5. After chain cutting and chain cutting are completed, the manual pilot valve 3 on the pure water motor hydraulic control system valve is operated, the closed brake 9 is controlled to release braking and the pure water plunger motor 10 rotates, the speed reducer 8 is driven, the scraper conveyor is driven to rotate positively and negatively through the gear box, tension releasing is carried out on the chain, and the chain is loosened.

6. After the tension of the chain is released, the manual pilot valve 3 is stopped, the normally closed brake 9 brakes rapidly, and the pure water plunger motor 10 stops running. And finally, closing the stop valve 7, stopping the liquid supply of the system, and cutting off the power connection between the pure water hydraulic chain tightening device and the scraper conveyor, so that the chain tightening work of the scraper conveyor is finished.