CN115325418B

CN115325418B - Lubricating grease circulation recovery system

Info

Publication number: CN115325418B
Application number: CN202211119157.7A
Authority: CN
Inventors: 雷泽春
Original assignee: Chongqing Youlan Energy Equipment Co ltd
Current assignee: Chongqing Youlan Energy Equipment Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2024-04-09
Anticipated expiration: 2042-09-14
Also published as: CN115325418A

Abstract

The invention discloses a lubricating grease recycling system which comprises a clean oil storage device, an oil inlet filter device, an atomization device, mechanical equipment, a recycling oil storage tank, a primary filter device and a secondary filter device which are sequentially connected, wherein the clean oil storage device, the oil inlet filter device, the atomization device, the mechanical equipment, the recycling oil storage tank, the primary filter device and the secondary filter device are communicated through pipelines to form a recycling loop, and the lubricating grease recycling system is controlled by a control system to carry out oil injection lubrication on the mechanical equipment and then filter and recycle the mechanical equipment. According to the invention, the atomization spraying of mechanical equipment is completed through the arranged filtering and atomizing device, the recovered lubricating grease is recovered and filtered through the primary filtering device and the secondary filtering device, impurities in the recovered lubricating grease are cleaned and then recycled to the clean oil storage device to form a circulating loop, and automatic control is realized through the PLC control system, so that the filtering and recovery of the lubricating grease can be efficiently completed, the use cost of the lubricating grease is saved, the treatment cost of waste grease is reduced, and the purpose of saving and utilizing energy is achieved.

Description

Lubricating grease circulation recovery system

Technical Field

The invention belongs to the technical field of lubricating grease recycling, and particularly relates to a lubricating grease recycling system.

Background

Lubricating oil plays a very important role in manufacturing industry and mechanical equipment, and is not used in machining or machine operation, and the main roles of lubricating oil are lubrication, cooling, rust prevention, cleaning, sealing, buffering and the like. The lubricating grease is prepared from high-viscosity synthetic lubricating oil and various additives such as antioxidation, rust prevention and the like, has excellent antiwear and extreme pressure properties, and ensures optimal load capacity; friction is reduced very effectively, and generated heat is controlled to be minimum; and the lubricating agent also has excellent high-temperature oxidation stability, and ensures the long-term normal work of the lubricating part at high temperature. Lubricating grease is widely applied to the running of equipment in various industries, wherein the lubricating grease is lubricated in the running process of the equipment, the consumption of the lubricating grease is very large every year, the lubricating grease basically belongs to disposable consumer products, and the waste is directly treated in general, but the treatment mode can cause resource waste. Therefore, the recycling of the lubricating grease can greatly improve the use efficiency and reduce the production cost. However, when lubrication is used during machining or during machine operation, more and more impurities are deposited in the lubrication oil, including metal powder, colloidal suspensions, sand, etc., due to cutting, wear and other factors.

Therefore, the main problem of recovering the lubricating grease is that impurities in the recovered lubricating grease are filtered, the lubricating grease is recovered and recycled, and the waste of the lubricating grease is avoided.

Disclosure of Invention

The invention aims to overcome the defects, and provides a lubricating grease recycling system which solves the problem that resources are wasted because lubricating grease cannot be recycled in the using process in the prior art.

In order to achieve the above purpose, the technical scheme provided by the invention is as follows:

the utility model provides a lubricating grease circulation recovery system, includes net oil storage device, oil feed filter equipment, atomizing device, mechanical equipment, retrieves oil storage tank, primary filter equipment and secondary filter equipment and forms circulation loop through the pipeline intercommunication that connects gradually, and filters the recovery recycling after controlling this lubricating grease circulation recovery system to mechanical equipment through control system and carry out oil spout lubrication.

By adopting the structural design, the invention completes the atomization injection of mechanical equipment through the arranged filtering and atomizing device, carries out the recovery and filtering treatment on the recovered lubricating grease through the primary filtering device and the secondary filtering device, cleans the impurities in the recovered lubricating grease, and then circulates the cleaned lubricating grease to the clean oil storage device to form a circulating loop, realizes automatic control through the PLC control system, can efficiently complete the filtration and recovery of the lubricating grease, saves the use cost of the lubricating grease, reduces the treatment cost of waste grease, and achieves the purpose of energy conservation and utilization.

Preferably, the oil purifying storage device is provided with an oil outlet pipe and an oil return pipe, the oil outlet pipe is sequentially communicated with the oil inlet filtering device and the atomizing device, the oil return pipe is communicated with the secondary filtering device, the mechanical equipment is provided with a protective cover, the protective cover is provided with an opening, a plurality of nozzles are arranged at the opening, and the nozzles are communicated with the atomizing device to finish lubricating grease spraying.

By adopting the structural design, the setting of the atomizing device can form spray mist with grease entering mechanical equipment, so that the spraying is more uniform, and the lubricating effect is improved.

Preferably, the oil inlet filtering device comprises a shell and a filtering component arranged in the shell, the shell penetrates through to form a cavity, the filtering component comprises a first-stage filter screen, a second-stage filter screen, a screen pressing lantern ring and a supporting frame, the first-stage filter screen and the second-stage filter screen are arranged in the cavity at intervals, the supporting frames are respectively arranged below the filtering component to support the filtering component, and the screen pressing lantern ring is arranged between the supporting frames below the second-stage filter screen and the first-stage filter screen to fixedly support the first-stage filter screen and the supporting frame above the filtering component.

By adopting the structural design, the lubricating grease to be filtered is subjected to multistage filtration through the primary filter screen and the secondary filter screen, the grease in the atomization device entering the downstream is prevented from having impurities to influence the service life of the control valve of the lubricating grease, and the lubricating grease is supported by the support frame arranged below the primary filter screen and the secondary filter screen, so that the primary filter screen and the secondary filter screen are prevented from deforming under the impact of high-pressure viscous lubricating grease, and the filtering effect of the oil inlet filter device is ensured.

Preferably, the upper end and the lower end of the shell are provided with a feed inlet and a discharge outlet which are communicated with external equipment, and a sealing ring and an internal thread sealing ring are sequentially arranged on the primary filter screen in the feed inlet and are used for sealing the joint of the primary filter screen and the inner wall of the cavity; the lower extreme of cavity inner wall has seted up the mount table, has installed support frame, second grade filter screen, press net lantern ring, support frame, one-level filter screen, sealing washer and internal thread sealing ring on this mount table in proper order.

By adopting the structural design, the sealing fit of the filtering device and the material outlet can be ensured, and the influence of the inflow of lubricating grease from the joint of the primary filter screen and the inner wall of the cavity on the filtering effect can be avoided; meanwhile, the installation of the installation table can ensure the fixed installation of the primary filter screen and the secondary filter screen in the cavity, and the disassembly is convenient.

Preferably, the atomizing device comprises a box body, a flow control bottom plate is fixedly arranged in the box body, an oil inlet and an oil outlet are connected to the flow control bottom plate, an oil way is arranged in the flow control bottom plate and is respectively communicated with the oil inlet and the oil outlet, and a plurality of control valves arranged on the flow control bottom plate, the oil outlet is controlled to discharge oil through the control valves, a signal detector is arranged on the control valves, a plurality of pneumatic valves are arranged on one sides of the control valves, an air inlet pipe and an air blowing pipe are connected to the pneumatic valves, the oil outlet and the air blowing pipe are respectively communicated with an external nozzle and are mixed with grease through high-pressure gas to form grease spray, and a controller is further arranged in the box body and is electrically connected with the signal detector for remotely transmitting an electric signal to an external terminal for monitoring.

By adopting the structural design, the atomization device can independently control the oil outlet of the oil outlet pipe by arranging the plurality of control valves on the flow control bottom plate, can distribute the oil outlet quantity according to the requirements, and detects the oil outlet of the control valve by the signal detector arranged below the control valve, so that whether the oil outlet is blocked or not; meanwhile, the plurality of control valves are matched with the air blowing pipes on the pneumatic valves correspondingly arranged to convert grease into atomized grease for spraying, so that the uniformity of grease spraying is improved, and the use of lubricating grease is saved. Meanwhile, the oil outlet condition of the control valve is detected through the signal detector, signals are transmitted to the controller and then transmitted to the external terminal, and the monitoring information is manually processed, such as the condition of blockage, so that overhaul and dredging are manually carried out.

Preferably, a main oil inlet hole is formed in one side of the flow control bottom plate and is communicated with an oil inlet pipeline transversely formed in the flow control bottom plate, 2 sub oil inlet holes are transversely formed in the oil inlet pipeline and penetrate through one side of the flow control bottom plate, a main oil outlet hole is formed above each sub oil inlet hole, the main oil outlet hole is communicated with an oil outlet pipeline vertically formed in the flow control bottom plate, and 2 sub oil outlet holes are vertically formed in the oil outlet pipeline; the oil inlet butt joint hole and the oil outlet butt joint hole are correspondingly formed in the control valve, the control valve is fixedly arranged on the flow control bottom plate, and the oil inlet butt joint hole and the oil outlet butt joint hole are respectively communicated with the oil separating inlet hole and the oil separating outlet hole.

By adopting the structural design, 2 oil distributing holes are transversely formed in the oil inlet pipeline, 2 control valves can be integrally formed in the flow control bottom plate, the complexity of single installation is solved, meanwhile, 2 oil distributing holes are vertically formed in the oil outlet pipeline, each oil distributing hole is communicated with the control valve, a plurality of oil distributing modes are further formed, a multi-point or single-point oil distributing mode can be realized according to oil supply requirements, and the saving effect can be achieved.

Preferably, the lower part in the mechanical equipment is of a concave structure, an oil return main pipe is arranged at the concave part and is communicated with a recovery oil storage tank, a drain outlet is arranged at the bottom of the recovery oil storage tank, a strong magnet is arranged at the bottom to adsorb and filter scrap iron, and an outlet is arranged at the lower part of the recovery oil storage tank and is communicated with an oil return pipe and the absolute oil storage device; the oil return pipe is sequentially provided with a primary filter device and a secondary filter device, and the front ends of the oil return pipe, which enter the primary filter device and the secondary filter device, are respectively provided with a stop valve.

By adopting the structural design, the setting of the strong magnet at the bottom of the recovery oil storage tank can carry out the first filtration on the iron skips of the recovered grease, the iron skips can be adsorbed on the strong magnet for periodic cleaning, and the later-stage filtration effect is better.

Preferably, the primary filtering device comprises a tank body, a detachable filter screen disc is arranged in the tank body and used for filtering materials, a plurality of heating pipes which are detachable and extend into the tank body are arranged below the tank body and used for heating and enhancing fluidity of viscous materials, and an inlet and an outlet are respectively arranged at the top and the bottom of the tank body and are respectively communicated with the oil return pipe;

the filter screen plate is arranged at the 1/3 position below the tank body, wherein guide rails are upwards arranged on the inner wall of the tank body in four directions and extend to the upper end edge, a fixing table is convexly arranged at the lower end edge of the guide rails along the inner wall of the tank body, four clamping grooves are formed in the side edges of the filter screen plate corresponding to the guide rails, the clamping grooves of the filter screen plate can be movably arranged on the guide rails in the tank body up and down, and the filter screen plate is fixed through the fixing table when being positioned at the lower end of the guide rails.

By adopting the structural design, the lower end in the tank body is provided with a plurality of heating pipes, so that the fluidity of the viscous material can be effectively enhanced by heating, and the situation that the viscous material is blocked at a discharge port under the conditions of standing and the like is prevented. Meanwhile, the filter screen disc is arranged in the tank body in a vertically sliding mode, the filter screen disc is easy to replace when deformed under high-pressure impact of viscous materials, and meanwhile, the filter screen disc is convenient to clean the filtered magazines regularly, so that the use convenience of the filter device is improved.

Preferably, 4 heating pipes are arranged below the tank body, extend into the tank body and are positioned below the filter screen disc, the heating pipes are in contact with materials for electric heating, the rear ends of the heating pipes are provided with mounting ends, the mounting ends are fixedly connected with the connecting flange, mounting holes are formed in the tank body in a penetrating mode, and the heating pipes are fixedly arranged on the tank body through the connecting flange.

By adopting the structural design, the heating pipe can effectively heat materials from multiple directions to ensure the fluidity of the materials, the situation of blocking a discharge hole after standing cannot occur, and meanwhile, the heating pipe adopts a convenient dismounting mode and is convenient to replace.

Preferably, the secondary filter device comprises a mounting frame, an oil storage barrel, a negative pressure device, an oil cylinder, a filter vat and a collecting barrel, wherein the oil storage barrel and the collecting barrel are fixedly arranged above the mounting frame, a first pipeline and a second pipeline are connected to the negative pressure device, one ends of the first pipeline and the second pipeline are arranged in the negative pressure device, the other ends of the first pipeline and the second pipeline are respectively communicated with the oil storage barrel and the filter vat arranged on the mounting frame, the outlet of the other end of the filter vat is communicated with the collecting barrel through a third pipeline, and a piston is arranged in the negative pressure device and connected with the oil cylinder arranged on one side to reciprocate so as to realize oil inlet and oil outlet in the negative pressure device.

By adopting the structural design, the secondary filtering device is matched with the oil cylinder by arranging the negative pressure device, the oil cylinder reciprocates to drive the first pipeline and the second pipeline connected with the negative pressure device to convey grease from the oil storage barrel to the filtering device for filtering, power is provided for filtering viscous grease under the action of external force, and the filtering can be completed by the filtering device quickly, so that the filtering effect is improved.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the atomization spraying of mechanical equipment is completed through the arranged filtering and atomizing device, the recovered lubricating grease is recovered and filtered through the primary filtering device and the secondary filtering device, impurities in the recovered lubricating grease are cleaned and then recycled into the clean oil storage device to form a circulating loop, and automatic control is realized through the PLC control system, so that the filtering and recovery of the lubricating grease can be efficiently completed, and the use cost of the lubricating grease is saved.

2. According to the invention, the oil inlet filtering device is arranged in the whole circulating recovery system before the lubricating grease enters the mechanical equipment to filter the lubricating grease, so that the condition that a control valve is blocked due to the fact that impurities enter the atomizing device is prevented, meanwhile, the recovery oil storage tank is arranged on the recovery pipeline to adsorb and filter scrap iron impurities of the recovered lubricating grease, then the recovered lubricating grease is filtered through the primary filtering device and the secondary filtering device, and 3 times of filtering are adopted in the recovery process, so that the cleanliness of the recovered grease can be effectively ensured.

3. According to the oil inlet filter device, the lubricating grease to be filtered is subjected to multistage filtration through the primary filter screen and the secondary filter screen, impurities in the lubricating grease are removed, and the lubricating grease is supported by the support frame arranged below the primary filter screen and the secondary filter screen, so that the primary filter screen and the secondary filter screen are prevented from deforming under the impact of high-pressure lubricating grease, and the filtering effect of the filter device is ensured; meanwhile, the press net lantern ring is arranged between the primary filter net and the secondary filter net to separate and install the press net lantern ring, so that enough space between the primary filter net and the secondary filter net can be ensured to buffer and filter.

4. The lower end of the tank body of the primary filtering device is provided with a plurality of heating pipes which can effectively heat the viscous material to strengthen the fluidity of the viscous material, so that the viscous material is prevented from being blocked at the discharge port under the conditions of standing and the like.

5. The secondary filter device is provided with the negative pressure device and the oil cylinder which are matched, and the oil cylinder reciprocates to drive the first pipeline and the second pipeline which are connected with the negative pressure device to convey grease from the oil storage barrel to the filter device for filtering, so that power is provided for filtering viscous grease under the action of external force, the filtering can be completed through the filter device quickly, the filtering effect is improved, the automatic feeding, discharging and filtering are realized, the degree of automation is higher, the filtering effect is good, and the filtering of viscous grease can be completed efficiently.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic view of the structure of the oil feed filter device of the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic view of the structure of the support frame for mounting the primary or secondary filter screen in FIG. 2;

FIG. 5 is a schematic view of the structure of the atomizing device according to the present invention;

FIG. 6 is a schematic view of the flow control floor mounted control valve of FIG. 5;

FIG. 7 is a schematic view of the flow control floor of FIG. 6;

FIG. 8 is a schematic diagram of the control valve of FIG. 6;

FIG. 9 is a perspective view of the flow control floor of FIG. 6;

FIG. 10 is a schematic view of the primary filter device of the present invention;

fig. 11 is an enlarged view of fig. 10 at B;

FIG. 12 is a schematic view of the structure of the filter tray of FIG. 10;

FIG. 13 is a schematic view of a secondary filter device of the present invention;

FIG. 14 is a schematic view of the secondary filter device of FIG. 13 from another angle;

fig. 15 is a schematic diagram of the secondary filter device of fig. 13.

In the drawings, reference numerals are described below.

The absolute oil storage device 1, the oil feed filter device 2, the housing 2a, the cavity 21a, the feed inlet 22a, the discharge outlet 23a, the mounting table 24a, the filter assembly 2b, the primary filter screen 21b, the secondary filter screen 22b, the screen pressing collar 23b, the support frame 24b, the seal ring 2c, the internally threaded seal ring 2d, the atomizing device 3, the housing 3a, the flow control bottom plate 3b, the main oil feed hole 31b, the oil separation hole 32b, the main oil outlet 33b, the oil outlet 34b, the oil separation hole 35b, the oil inlet 36b, the oil inlet 3c, the oil outlet 3d, the oil passage 3e, the control valve 3f, the oil inlet butt hole 31f, the oil outlet butt hole 32f, the pneumatic valve 3g, the air inlet pipe 3h, the air blowing pipe 3i, the signal detector 3j, the controller 3k, the flow adjustment device 3l, the mechanical equipment 4, the protection cover 4a, the opening 4b, the oil storage tank 5, the drain 5a, the strong magnet 5b the primary filter device 6, the tank 6a, the inlet 61a, the outlet 62a, the heat insulating layer 63a, the heat conductive layer 64a, the filter screen tray 6b, the holding groove 61b, the mounting portion 62b, the fixing portion 63b, the heating pipe 6c, the mounting end 61c, the guide rail 6d, the fixing table 61d, the fixing hole 62d, the connection flange 6e, the seal cover 6f, the secondary filter device 7, the mounting bracket 7a, the mounting platform 71a, the integration frame 72a, the oil storage tank 7b, the negative pressure device 7c, the cylinder 7d, the expansion link 71d, the filter vat 7e, the collection tank 7f, the first pipeline 7g, the second pipeline 7h, the third pipeline 7i, the check valve 7k, the oil inlet and outlet path 7l, the hydraulic station tank 7m, the electromagnetic directional valve 7n, the liquid level thermometer 7p, the protective sleeve 7q, the oil pump motor 7r, the oil outlet pipe 8a, the oil return pipe 8b, the branch oil return pipe 81b, the oil return main pipe 8c, the shutoff valve 9, the filter 10, and the gear pump 11.

Detailed Description

In order to describe the technical content, the constructional features, the achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1, a lubricating grease recycling system comprises a clean oil storage device 1, an oil inlet filtering device 2, an atomizing device 3, a mechanical device 4, a recycling oil storage tank 5, a primary filtering device 6 and a secondary filtering device 7 which are sequentially connected, wherein the recycling oil storage tank, the primary filtering device 6 and the secondary filtering device 7 are communicated through pipelines to form a recycling loop, and the lubricating grease recycling system is controlled by a control system to carry out oil spraying lubrication on the mechanical device 4 for recycling through filtering. In this embodiment, the control system adopts a PLC control system. The oil purifying and storing device is characterized in that an oil outlet pipe 8a and an oil return pipe 8b are arranged on the oil purifying and storing device 1, the oil outlet pipe 8a is sequentially communicated with the oil inlet filtering device 2 and the atomizing device 3, the oil return pipe 8b is communicated with the secondary filtering device 7, a protective cover 4a is arranged outside the mechanical equipment 4, an opening 4b is arranged on the protective cover 4a, a plurality of nozzles are arranged at the opening 4b, and the nozzles are communicated with the atomizing device 3 to finish lubricating grease spraying. In the invention, the grease is provided with a gear pump 11 for supplying power before entering the oil inlet filter device 2, the primary filter device 6 and the secondary filter device 7.

Referring to fig. 2, 3 and 4, the oil inlet filtering device 2 includes a housing 2a and a filtering assembly 2b disposed in the housing 2a, and the housing 2a penetrates through to form a cavity 21a. The filter component comprises a first-stage filter screen 21b, a second-stage filter screen 22b, a press screen collar 23b and a supporting frame 24b, wherein the first-stage filter screen 21b and the second-stage filter screen 22b are arranged in a cavity 21a at intervals, the supporting frame 24b is arranged below the first-stage filter screen and the second-stage filter screen to support the first-stage filter screen 21b and the second-stage filter screen 22b in a cross-shaped structure in the embodiment, the supporting frame 24b can ensure that the first-stage filter screen 21b and the second-stage filter screen 22b cannot deform in the middle under the high-pressure impact state because lubricating grease is viscous fluid, the middle of the filter screen is stressed by impact force to deform easily in the flowing process, and therefore, the cross-shaped structure can strengthen the middle stress and cannot influence the filtering effect. The press-net collar 23b is disposed between the secondary filter net 22b and the supporting frame 24b below the primary filter net 21b, and is used for fixedly supporting the primary filter net 21b and the supporting frame 24b above. In this embodiment, the primary filter screen 21b and the secondary filter screen 22b are made of stainless steel, and are formed by tabletting, and the filter aperture of the primary filter screen 21b is larger than that of the secondary filter screen 22 b. The space between the primary filter screen 21b and the secondary filter screen 22b is separated by the screen pressing collar 23b to form a buffer space in the middle, so that the lubricating grease entering from the primary filter screen 21b can be filtered slowly when entering the secondary filter screen 22b, and the condition of blockage can not occur.

The upper and lower both ends of casing 2a are equipped with feed inlet 22a and discharge gate 23a, respectively with go out oil pipe 8a intercommunication, just feed inlet 22a in be equipped with sealing washer 2c and internal thread sealing ring 2d on one-level filter screen 21b in proper order for the junction to one-level filter screen 21b and cavity 21a inner wall seals. Wherein, the internal thread sealing ring 2d is communicated with the oil outlet pipe 8a to realize sealing connection.

During installation, an installation table 24a is arranged at the lower end of the inner wall of the cavity 21a, and a support frame 24b, a secondary filter screen 22b, a screen pressing collar 23b, a support frame 24b, a primary filter screen 21b, a sealing ring 2c and an internal thread sealing ring 2d are sequentially arranged on the installation table 1a. The mode of overlapping in proper order is fixed in this application, and the dismouting is more convenient, and the top is fixed through internal thread sealing ring 2d, and lubricating grease gets into the impact pressure who brings into from the top when using simultaneously downwards to support through the mount table 24a of below, stability is stronger.

The oil inlet filter device 2 is used for carrying out classified filtration on the characteristics of stronger impact force and larger pressure of viscous fluid of lubricating grease, a first-stage filter screen 21b and a second-stage filter screen 22b are arranged in a shell 2a, so that the filtration effect is guaranteed, meanwhile, cross-shaped support frames 24b are arranged below the first-stage filter screen 21b and the second-stage filter screen 22b, the middle parts of the first-stage filter screen 21b and the second-stage filter screen 22b are supported under the high-pressure impact force state, the situation that the middle parts are stressed and excessively deformed cannot occur is avoided, and the positions around the filter screens are easily separated from the inner wall of a cavity 21a or gaps are formed, so that the filtration effect is influenced. Meanwhile, the pressing net lantern ring 23b is arranged between the primary filter net 21b and the secondary filter net 22b, so that the supporting and mounting functions can be achieved, meanwhile, a buffer space is reserved between the primary filter net 21b and the secondary filter net 22b, and the middle reserved space is free from blocking of the secondary filter net 22b before the filter net passes through the filter net with the large aperture and enters the filter net with the small aperture. Therefore, the application adopts the structural design, can effectively guarantee the filtration of lubricating grease with high pressure and high impact force, and the condition that the middle parts of the primary filter screen 21b and the secondary filter screen 22b deform can not appear.

Referring to fig. 5 to 9, the atomizing device 3 includes a box 3a, a flow control bottom plate 3b is fixedly installed in the box 3a, an oil inlet 3c and an oil outlet 3d are connected to the flow control bottom plate 3b, an oil path 3e is provided in the flow control bottom plate 3b and is respectively communicated with the oil inlet 3c, the oil outlet 3d and a plurality of control valves 3f installed on the flow control bottom plate 3b, the oil outlet 3d is controlled to discharge oil through the control valves 3f, a signal detector 3j is provided on the control valves 3f, a plurality of pneumatic valves 3g are provided on one side of the control valves 3f, an air inlet pipe 3h and an air blowing pipe 3i are connected to the pneumatic valves 3g, the oil outlet 3d and the air blowing pipe 3i are respectively communicated with an external nozzle and are mixed with grease through high-pressure gas to form grease spray, and a controller 3k is further provided in the box 3a and the signal detector 3j is electrically connected for remotely transmitting an electrical signal to an external terminal for monitoring, thus performing blocking early warning and then manually overhauling.

The oil inlet 3c passes through the outside of the box body 3a and is communicated with the oil outlet pipe 8a, the oil outlet 3d passes through the box body 3a, and the oil outlet 3d is provided with a flow regulating device 3l for regulating the oil outlet quantity, so that the corresponding control valve 3f can be independently regulated according to the oil supply requirements of different positions and the positions of the injection nozzles to control the oil outlet.

The flow control bottom plate 3b in the box body 3a is provided with 2 control valves 3f, 2 pneumatic valves 3g are correspondingly arranged in the box body 3a, and the oil outlet 3d connected with one control valve 3f and the air blowing pipe 3i connected with one pneumatic valve 3g form a group to be arranged at the position of the oil nozzle to form oil spray. Specifically, a main oil inlet hole 31b is arranged on one side of the flow control bottom plate 3b, the main oil inlet hole 31b is communicated with an oil inlet pipeline 36b transversely arranged in the flow control bottom plate 3b, 2 oil separating and inlet holes 32b are transversely arranged on the oil inlet pipeline 36b and penetrate through one side of the flow control bottom plate 3b, a main oil outlet hole 33b is arranged above the position of each oil separating and inlet hole 32b, the main oil outlet hole 33b is communicated with an oil outlet pipeline 34b vertically arranged in the flow control bottom plate 2, and 2 oil separating and inlet holes 35b are vertically arranged on the oil outlet pipeline 34 b; the control valve 3f is correspondingly provided with an oil inlet butt joint hole 31f and an oil outlet butt joint hole 32f, the control valve 3f is fixedly arranged on the flow control bottom plate 3b, and the oil inlet butt joint hole 31f and the oil outlet butt joint hole 32f are respectively communicated with the oil separating inlet hole 32b and the oil separating outlet hole 35 b. The oil inlet pipeline 36b is provided with 2 oil inlet holes 32b, so that 2 control valves 3f can be installed in a butt joint mode, and the integrated installation structure can reasonably arrange installation design space. An oil outlet pipeline 34b is arranged at the position of each oil distributing and inlet hole 32b, and 2 oil distributing and inlet holes 35b are arranged on the oil outlet pipeline 34b and are communicated with the control valve 3f, so that a plurality of oil outlet channels are formed, and oil outlet of a single channel or simultaneous oil outlet of a plurality of channels can be controlled according to oil injection conditions.

With continued reference to fig. 1, the lower part in the mechanical device 4 is in a concave structure, an oil return main pipe 8c is arranged in the concave part and is communicated with a recovery oil storage tank 5, a drain outlet 5a is arranged at the bottom of the recovery oil storage tank 5, a strong magnet 5b is arranged at the bottom to adsorb and filter scrap iron, and an outlet is arranged below the recovery oil storage tank 5 and is communicated with an oil return pipe 8b and the clean oil storage device 1; the oil return pipe 8b is sequentially provided with a primary filter device 6 and a secondary filter device 7, and the front ends of the oil return pipe 8b, which enter the primary filter device 6 and the secondary filter device 7, are respectively provided with a stop valve 9. In this embodiment, a filter 10 is disposed at the outlet of the recovery oil tank 5 connected to the oil return pipe 8b, so that a part of impurities can be filtered at the bottom of the recovery oil tank 5 and periodically discharged through the drain 5 a. Meanwhile, in the invention, 2 branch oil return pipes 81b are formed through the oil return pipe 8b after passing through the primary filter device 6, the secondary filter device 7 is arranged on each branch oil return pipe 81b, and the stop valve 9 and the gear pump 11 are arranged on each branch oil return pipe 81b so as to facilitate grease to enter the secondary filter device 7 for rapid filtration and power supply.

Referring to fig. 10 to 12, the primary filtering device 6 includes a tank body 6a, a detachable filter screen disc 6b is disposed in the tank body 6a for filtering materials, in this embodiment, the filtered materials are mainly viscous lubricating grease, impurities in the lubricating grease are filtered, and the filter screen disc 6b has a circular arc structure, so that the trafficability of the viscous materials can be improved and the strength is higher. The lower part of the tank body 6a is provided with a plurality of heating pipes 6c which are detachable and extend into the tank body 6a, and the heating pipes are used for heating viscous materials to enhance fluidity and prevent the materials from being blocked at the outlet 62 a. The top and the bottom of the tank 6a are respectively provided with an inlet 61a and an outlet 62a which are respectively communicated with the oil return pipe 8 b. The bottom of the tank body 6a is of an arc-shaped structure, the outlet 62a is provided with a stop valve 9, the upper end of the tank body 6a is provided with a sealing cover 6f, and the inlet 61a is arranged on the sealing cover 6 f.

Wherein, the 1/3 position of the lower part of the tank body 6a is provided with the filter screen disc 6b, and 2/3 positions are reserved above the tank body 6a to enable viscous materials to enter the tank body 6a, so that the mobility of the materials can be effectively ensured under the height space, and the materials can smoothly pass through the filter screen disc 6b. The inner wall of the tank body 6a is provided with guide rails 6d upwards in four directions and extends to an upper end edge, the lower end edge of the guide rails 6d is convexly provided with a fixing table 61d along the inner wall of the tank body 6a, the side edge of the filter screen disc 6b is provided with four clamping grooves 61b corresponding to the guide rails 6d, the clamping grooves 61b of the filter screen disc 6b can be movably arranged on the guide rails 6d in the tank body 6a up and down, and the filter screen disc 6b is fixed through the fixing table 61d when being positioned at the lower end of the guide rails 6 d. The filter screen disc 6b is movably connected with the inside of the tank body 6a through the guide rail 6d, so that the impurity cleaning device is more convenient and faster to replace the filter screen disc 6b or clean impurities regularly. The filter screen disc 6b is replaced mainly because the impact force is strong when the viscous material is filtered, and the deformation of the filter screen disc 6b is easy to cause, so that the filter screen disc 6b needs to be replaced regularly to prevent the influence on the filtering effect.

The end edge of the filter screen disc 6b is provided with a mounting part 62b corresponding to a fixed table 61d arranged in the tank body 6a, the lower surface of the mounting part 62b is horizontally arranged, the upper surface is obliquely arranged, the upper end is obliquely arranged, materials can be prevented from being accumulated above the mounting part 62b, the lower part is horizontally arranged and stably contacted with the fixed table 61d, the mounting stability is ensured, and the lower surface of the mounting part 62b is flush with the lower end of the clamping groove 61 b. Meanwhile, a fixing hole 62d is vertically perforated inside the fixing table 61d, a fixing portion 63b is correspondingly protruded at the lower end of the mounting portion 62b of the filter screen disc 6b, and the fixing portion 63b is clamped in the fixing hole 62 d. By the snap connection between the filter screen disc 6b and the fixing table 61d, the mounting stability of the filter screen disc 6b can be improved, and deformation is not easy to occur under the condition of receiving high-pressure impact force.

The utility model discloses a jar, including jar body 6a, filter screen dish 6b, heating pipe 6c, jar body 6a below is equipped with 4 heating pipes 6c and stretches into jar body 6a and be located filter screen dish 6 b's below, heating pipe 6c and material contact carry out electrical heating, just heating pipe 6 c's rear end is equipped with installation end 61c, and installation end 61c and flange 6e fixed connection, the mounting hole has been seted up in running through on the jar body 6a, heating pipe 6c passes through flange 6e fixed mounting on jar body 6 a. The mounting end 61c and the connecting flange 6e in this embodiment may be connected by threads, and a sealing ring is provided at the connection portion for sealing. Meanwhile, in the scheme, the tank body 6a adopts a double-layer structure, the outer layer is the heat insulation layer 63a, the inner layer is the heat conduction layer 64a, the heat conduction layer 64a can conduct the heat after the lower heating to the upper side, so that the internal temperature of the whole tank body 6a is higher, the materials in the upper and lower directions of the filter screen disc 6b are kept at the temperature to improve the fluidity, and the heat dissipation of the outer layer of the heat insulation layer 63a can be prevented.

Referring to fig. 13 to 15, the secondary filter 7 includes a mounting frame 7a, an oil storage tank 7b, a negative pressure device 7c, an oil cylinder 7d, a filter tank 7e and a collection tank 7f. The oil storage barrel 7b and the collecting barrel 7f are fixedly arranged above the mounting frame 7a, specifically, a mounting platform 71a is arranged on one side of the mounting frame 7a, and the oil storage barrel 7b and the collecting barrel 7f are fixedly arranged on the mounting platform 71 a. The negative pressure device 7c is connected with a first pipeline 7g and a second pipeline 7h, one ends of the first pipeline 7g and the second pipeline 7h are respectively arranged in the negative pressure device 7c, the other ends of the first pipeline 7g and the second pipeline 7h are respectively communicated with an oil storage barrel 7b and a filter barrel 7e arranged on a mounting frame 7a, an outlet of the other end of the filter barrel 7e is communicated with a collecting barrel 7f through a third pipeline 7i, and a piston arranged in the negative pressure device 7c is connected with an oil cylinder 7d arranged on one side to perform reciprocating motion so as to realize oil inlet and oil outlet in the negative pressure device 7 c. In the use process, the oil cylinder 7d drives the negative pressure device 7c to realize internal pressure change, and further realizes oil inlet and oil outlet and provides power for the first pipeline 7g and the second pipeline 7h which are communicated with the oil cylinder. The lower ends of the oil storage barrel 7b and the collecting barrel 7f are respectively connected with the first pipeline 7g and the third pipeline 7i, and the connection is arranged on the first pipeline 7g and the third pipeline 7i, and a stop valve 9 is arranged on the connection to control the opening and closing of oil inlet and recovered oil, and the stop valve 9 is connected with a flange during installation. The first pipeline 7g and the second pipeline 7h are respectively provided with a one-way valve 7k, so that only one-way oil inlet or oil outlet can be ensured when the pressure in the negative pressure device 7c changes. In this embodiment, the joints of the first pipeline 7g, the second pipeline 7h and the third pipeline 7i, the negative pressure device 7c and the filter vat 7e are all connected by adopting a sealing structure.

The bottom of mounting bracket 7a is fixed with integration frame 72a, negative pressure device 7c and hydro-cylinder 7d are fixed to be installed on integration frame 72a, set up a plurality of installation stations on this integration frame 72a, the fixed installation on the installation station negative pressure device 7c, hydro-cylinder 7d and filter vat 7e have adopted the integrated installation on integration frame 72a, can improve the spatial arrangement of subassembly in the mounting bracket 7 a. And the telescopic rod 71d of the oil cylinder 7d stretches into the negative pressure device 7c and is connected with the piston in the oil cylinder 7d to drive the piston to reciprocate, a protective sleeve 7q is fixedly connected between the negative pressure device 7c and the oil cylinder 7d, and the protective sleeve 7q is sleeved outside the telescopic rod 71d and is not contacted with the telescopic rod 71d, so that the telescopic rod 71d can be dustproof, and dust is prevented from being brought into the oil cylinder 7d and the negative pressure device 7 c. The oil cylinder 7d is communicated with a hydraulic station oil tank 7m arranged on the mounting frame 7a through an oil inlet and outlet path 7l, an oil pump motor 7r is arranged on the hydraulic station oil tank 7m, and an electromagnetic reversing valve 7n is arranged on the oil inlet and outlet path 7l and used for switching the oil inlet and outlet direction of the oil inlet and outlet path 7l, so that the oil cylinder 7d can reciprocate. The hydraulic station oil tank 7m is provided with a liquid level thermometer 7p for monitoring the liquid level and the temperature in the hydraulic station oil tank 7 m.

The filter vat 7e is fixedly installed on the integration frame 72a, an inlet of the filter vat 7e is connected with the second pipeline 7h, an outlet of the filter vat 7e is connected with the third pipeline 7i, and a plurality of layers of filter screens are arranged in the filter vat 7e, in this embodiment, the filter vat 7e. The filtering precision of the filtering net is 200 meshes or 120 meshes, and in the embodiment, only the filtering net is taken as a preferred embodiment.

When the secondary filter device 7 is used, lubricating grease subjected to primary filtration enters an oil storage barrel 7b of the secondary filter device 7, then a recovery filter system consisting of the oil storage barrel 7b, a negative pressure device 7c, an oil cylinder 7d, a filter barrel 7e and a collecting barrel 7f is arranged on a mounting frame 7a, the oil cylinder 7d is connected with the negative pressure device 7c, so that pressure difference is formed inside the negative pressure device 7c, the first pipeline 7g, the second pipeline 7h and the third pipeline 7i are communicated, grease to be filtered in the oil storage barrel 7b is sucked into the negative pressure device 7c, and then the grease is conveyed into the filter barrel 7e for filtration through pushing of the oil cylinder 3, wherein the oil cylinder 7d and the negative pressure device 7c play a role in pushing the grease conveying and filtering, and the passing property and the filtering efficiency of the grease can be improved. Meanwhile, the secondary filter device 7 controls the oil cylinder 7d to do linear reciprocating motion through the control system, so that a piston in the negative pressure device 7c is driven to reciprocate, when the piston is pulled backwards, the one-way valve 7k on the first pipeline 7g is opened, the one-way valve 7k on the second pipeline 7h is closed, oil absorption begins, after the piston reaches a designated position, the oil cylinder 7d reverses, the piston is pushed forwards, the one-way valve 7k on the first pipeline 7g is closed, the one-way valve 7k on the second pipeline 7h is opened, and the viscous grease is pressurized and sent into the filter barrel 7e of the secondary filter device 7 for filtration. Meanwhile, a plurality of pressure sensors are arranged in the filter drum 7e, an upper pressure limit value is set, a signal is transmitted to a control system after the pressure reaches the upper pressure limit value, the control system controls the filter device to stop automatically, the filter drum 7e is required to be cleaned when the filter device is judged to be too much in impurity, and regular cleaning and maintenance are adopted under normal conditions.

The working principle of the invention is as follows:

according to the invention, through a recovery system consisting of an absolute oil storage device 1, an oil inlet filtering device 2, an atomizing device 3, mechanical equipment 4, a recovery oil storage tank 5, a primary filtering device 6 and a secondary filtering device 7, a stop valve 9 on an oil outlet pipe 8a of a PLC control system is opened, grease is conveyed from the absolute oil storage device 1 to the oil inlet filtering device 2 by providing power through a gear pump 11 for filtering before spraying, the condition that the control valve 3f is blocked due to the fact that impurities enter into the control valve 3f of the atomizing device 3 is prevented, the filtered grease enters into the atomizing device 3, the oil outlet amount and the opening degree are controlled through the control valve 3f of the atomizing device 3, and meanwhile, the grease is matched with a pneumatic valve 3g to form an atomized state and is sprayed on the mechanical equipment 4 by a nozzle for lubricating. Meanwhile, grease after lubrication and use enters the recovery oil storage tank 5 from an oil return main pipe 8c connected below the mechanical equipment 4, iron filings in the recovered grease are adsorbed and filtered through a strong magnet 5b arranged inside, then the grease filtered by the iron filings enters the primary filtering device 6 for primary filtering, and then enters the secondary filtering system 7 for secondary filtering, and enters the absolute oil storage device 1 for recycling through an oil return pipe 8 b.

Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are used for convenience of description only and do not limit the present invention in any way, and other devices identical or similar to the present invention are used within the scope of the present invention.

Claims

1. The lubricating grease recycling system is characterized by comprising a clean oil storage device (1), an oil inlet filtering device (2), an atomizing device (3), mechanical equipment (4), a recycling oil storage tank (5), a primary filtering device (6) and a secondary filtering device (7) which are sequentially connected, wherein the clean oil storage device, the oil inlet filtering device, the atomizing device, the mechanical equipment, the recycling oil storage tank, the primary filtering device and the secondary filtering device are communicated through pipelines to form a recycling loop, and the lubricating grease recycling system is controlled by a control system to carry out oil spraying lubrication on the mechanical equipment (4) for recycling through filtering;

the oil purifying and storing device is characterized in that an oil outlet pipe (8 a) and an oil return pipe (8 b) are arranged on the oil purifying and storing device (1), the oil outlet pipe (8 a) is sequentially communicated with the oil inlet filtering device (2) and the atomizing device (3), the oil return pipe (8 b) is communicated with the secondary filtering device (7), a protective cover (4 a) is arranged outside the mechanical equipment (4), an opening (4 b) is arranged on the protective cover (4 a), and a plurality of nozzles are arranged at the opening (4 b), and the nozzles are communicated with the atomizing device (3) to finish lubricating grease spraying;

the oil inlet filtering device (2) comprises a shell (2 a) and a filtering component (2 b) arranged in the shell (2 a), wherein the shell (2 a) penetrates through to form a cavity (21 a), the filtering component (2 b) comprises a primary filtering screen (21 b), a secondary filtering screen (22 b), a screen pressing sleeve ring (23 b) and a supporting frame (24 b), the primary filtering screen (21 b) and the secondary filtering screen (22 b) are arranged in the cavity (21 a) at intervals, the supporting frames (24 b) are respectively arranged below the primary filtering screen and the supporting frame (24 b) which are arranged below the secondary filtering screen (22 b) and the primary filtering screen (21 b), and the supporting frame (24 b) which are arranged above the primary filtering screen are fixedly supported between the secondary filtering screen (22 b) and the supporting frame (24 b);

a feed inlet (22 a) and a discharge outlet (23 a) which are communicated with external equipment are arranged at the upper end and the lower end of the shell (2 a), and a sealing ring (2 c) and an internal thread sealing ring (2 d) are sequentially arranged on the first-stage filter screen (21 b) in the feed inlet (22 a) and are used for sealing the joint of the first-stage filter screen (21 b) and the inner wall of the cavity (21 a); the lower end of the inner wall of the cavity (21 a) is provided with an installation table (24 a), and the installation table (24 a) is sequentially provided with a support frame (24 b), a secondary filter screen (22 b), a screen pressing collar (23 b), the support frame (24 b), a primary filter screen (21 b), a sealing ring (2 c) and an internal thread sealing ring (2 d).

2. The lubricating grease recycling system according to claim 1, wherein the atomizing device (3) comprises a box body (3 a), a flow control bottom plate (3 b) is fixedly arranged in the box body (3 a), an oil inlet (3 c) and an oil outlet (3 d) are connected to the flow control bottom plate (3 b), an oil way (3 e) is arranged in the flow control bottom plate (3 b) and is respectively communicated with the oil inlet (3 c), the oil outlet (3 d) and a plurality of control valves (3 f) arranged on the flow control bottom plate (3 b), the oil outlet (3 d) is controlled to discharge oil through the control valves (3 f), a signal detector (3 j) is arranged on the control valve (3 f), a plurality of pneumatic valves (3 g) are arranged on one side of the control valve (3 f), an air inlet pipe (3 h) and an air blowing pipe (3 i) are connected to the pneumatic valves (3 g), the oil outlet (3 d) and the air blowing pipe (3 i) are respectively communicated with an external nozzle and are mixed with grease through high-pressure gas to form grease spraying, and the box body (3 a) is further provided with a plurality of electrical signals (3 k) for carrying out electrical connection with the monitoring terminal.

3. A lubricating grease recycling system as claimed in claim 2, wherein one side of the flow control bottom plate (3 b) is provided with a main oil inlet hole (31 b), the main oil inlet hole (31 b) is communicated with an oil inlet pipeline (36 b) transversely arranged in the flow control bottom plate (3 b), 2 oil separating and inlet holes (32 b) transversely arranged on the oil inlet pipeline (36 b) penetrate one side of the flow control bottom plate (3 b), a main oil outlet hole (33 b) is arranged above the position of each oil separating and inlet hole (32 b), the main oil outlet hole (33 b) is communicated with an oil outlet pipeline (34 b) vertically arranged in the flow control bottom plate (3 b), and 2 oil separating and inlet holes (35 b) are vertically arranged on the oil outlet pipeline (34 b); the control valve (3 f) is correspondingly provided with an oil inlet butt joint hole (31 f) and an oil outlet butt joint hole (32 f), the control valve (3 f) is fixedly arranged on the flow control bottom plate (3 b), and the oil inlet butt joint hole (31 f) and the oil outlet butt joint hole (32 f) are respectively communicated with the oil separating inlet hole (32 b) and the oil separating outlet hole (35 b).

4. The lubricating grease recycling system according to claim 1, wherein the lower part in the mechanical equipment (4) is of a concave structure, an oil return main pipe (8 c) is arranged in the concave part and is communicated with a recycling oil storage tank (5), a drain outlet (5 a) is arranged at the bottom of the recycling oil storage tank (5), a strong magnet (5 b) is arranged at the bottom of the recycling oil storage tank to adsorb and filter scrap iron, and an outlet is arranged below the recycling oil storage tank (5) and is communicated with an oil return pipe (8 b) to be communicated with the absolute oil storage device (1); the oil return pipe (8 b) is sequentially provided with a primary filter device (6) and a secondary filter device (7), and the front ends of the oil return pipe (8 b) entering the primary filter device (6) and the secondary filter device (7) are respectively provided with a stop valve (9).

5. A lubricating grease recycling system as set forth in claim 4, characterized in that the primary filtering device (6) comprises a tank body (6 a), a detachable filter screen disc (6 b) is arranged in the tank body (6 a) for filtering materials, a plurality of heating pipes (6 c) which are detachable and extend into the tank body (6 a) are arranged below the tank body (6 a) for heating and enhancing fluidity of the viscous materials, and an inlet (61 a) and an outlet (62 a) are respectively arranged at the top and the bottom of the tank body (6 a) and are respectively communicated with the oil return pipe (8 b);

the filter screen disc (6 b) is arranged at the position 1/3 below the tank body (6 a), wherein guide rails (6 d) are upwards arranged on the inner wall of the tank body (6 a) in four directions and extend to the upper end edge, a fixing table (61 d) is convexly arranged at the lower end edge of the guide rails (6 d) along the inner wall of the tank body (6 a), four clamping grooves (61 b) are formed in the side edge of the filter screen disc (6 b) corresponding to the guide rails (6 d), the clamping grooves (61 b) of the filter screen disc (6 b) can be movably arranged on the guide rails (6 d) in the tank body (6 a) up and down, and the filter screen disc (6 b) is fixed through the fixing table (61 d) when being located at the lower end of the guide rails (6 d).

6. The lubricating grease recycling system according to claim 5, wherein 4 heating pipes (6 c) are arranged below the tank body (6 a) and extend into the tank body (6 a) and are positioned below the filter screen disc (6 b), the heating pipes (6 c) are in contact with materials for electric heating, the rear ends of the heating pipes (6 c) are provided with mounting ends (61 c), the mounting ends (61 c) are fixedly connected with the connecting flange (6 e), mounting holes are formed in the tank body (6 a) in a penetrating mode, and the heating pipes (6 c) are fixedly arranged on the tank body (6 a) through the connecting flange (6 e).

7. The lubricating grease recycling system according to claim 1, wherein the secondary filtering device (7) comprises a mounting frame (7 a), an oil storage barrel (7 b), a negative pressure device (7 c), an oil cylinder (7 d), a filtering barrel (7 e) and a collecting barrel (7 f), the oil storage barrel (7 b) and the collecting barrel (7 f) are fixedly arranged above the mounting frame (7 a), a first pipeline (7 g) and a second pipeline (7 h) are connected to the negative pressure device (7 c), one ends of the first pipeline (7 g) and the second pipeline (7 h) are arranged in the negative pressure device (7 c), the other ends of the first pipeline (7 g) and the second pipeline (7 h) are respectively communicated with the oil storage barrel (7 b) and the filtering barrel (7 e) arranged on the mounting frame (7 a), the other end outlet of the filtering barrel (7 e) is communicated with the collecting barrel (7 f) through a third pipeline (7 i), and the negative pressure device (7 c) is internally provided with a piston and is connected with the oil cylinder (7 d) arranged on one side to move to realize oil inlet and return of the negative pressure device (7 c).