CN216789844U

CN216789844U - Grease filling cylinder

Info

Publication number: CN216789844U
Application number: CN202123159649.2U
Authority: CN
Inventors: 陈艳军; 苏校; 陈中
Original assignee: Zoomlion Earth Moving Machinery Co Ltd
Current assignee: Zoomlion Earth Moving Machinery Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-06-21
Anticipated expiration: 2031-12-15

Abstract

The utility model discloses a grease filling cylinder which comprises a pressurizing part, a grease filling part and an energy storage switching mechanism in transmission connection between the pressurizing part and the grease filling part, wherein in an energy storage state, the pressurizing pressure of the pressurizing part is partially transmitted to the filling pressure of the grease filling part in a filling state and is partially converted to stored energy of the energy storage switching mechanism, and in an energy release state, the stored energy can be at least partially transmitted to the negative pressure of self-priming of the grease filling part in a self-priming state. The grease filling cylinder integrates the pressurizing part and the grease filling part into a whole, the energy storage switching mechanism is arranged in the cylinder, the pressurizing part can be reset in motion, the control valve position of the electro-hydraulic actuating device can be reduced, the control is simplified, the switching control period of the electro-hydraulic actuating device can be set through the reciprocating movement period of the piston, and continuous and uninterrupted oil filling operation is realized.

Description

Grease filling cylinder

Technical Field

The utility model belongs to the field of mechanical engineering, and particularly relates to a grease filling cylinder used in a grease filling system.

Background

In various engineering machines such as an excavator, a loader, a bulldozer, a crane and the like, grease filling is necessary work every day, and grease plays a significant role in lubricating all pin shafts of the engineering machines. The grease filling can not only improve the working efficiency of the mechanism and prolong the service life, but also avoid generating larger friction noise influencing an operator. In practical operation, a manual filling mode with low efficiency is generally adopted for grease filling, a hydraulic cylinder driving mode is also adopted for driving the grease filling through hydraulic power, and although the grease filling efficiency is improved compared with the manual filling mode, the grease filling method also has the defects of complex hydraulic driving device, high cost for controlling valves, multiple fault points and the like, and further requires manual participation and high labor cost.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a grease filling cylinder with compact structure and low cost to realize continuous grease filling.

To achieve the above object, the present invention provides a butter filling cylinder, comprising:

a pressurization part;

the butter filling part comprises a filling state for outputting butter outwards and an oil self-sucking state for supplying butter inwards; and

the energy storage switching mechanism is in transmission connection between the pressurizing part and the grease filling part and comprises an energy storage state and an energy release state;

in the energy storage state, the pressurizing pressure of the pressurizing part is partially conducted to the filling pressure of the butter filling part in the filling state and is partially converted to the stored energy of the energy storage conversion mechanism, and in the energy release state, the stored energy can be at least partially conducted to the negative oil self-priming pressure of the butter filling part in the oil self-priming state.

In some embodiments, in the de-energized state, the stored energy is at least partially convertible to a reset pressure of the pressurization portion.

In some embodiments, the grease filling cylinder includes an outer cylinder barrel with a pressurizing piston and a filling piston disposed therein, the cylinder cavity of the outer cylinder barrel includes a pressurizing cavity formed between the pressurizing piston and the first end wall of the outer cylinder barrel, a middle cylinder cavity formed between the pressurizing piston and the filling piston, and a filling cavity formed between the filling piston and the second end wall of the outer cylinder barrel, the pressurizing portion includes the pressurizing piston and the pressurizing cavity, the grease filling portion includes the filling piston and the filling cavity, and the energy storage conversion mechanism includes a piston connection rod rigidly connecting the pressurizing piston and the filling piston to move in synchronization with the piston.

In some embodiments, the energy storage conversion mechanism further comprises a return spring disposed axially in the intermediate cylinder chamber, a first end of the return spring being connected to the pressurizing piston, and a second end of the return spring being fixedly disposed.

In some embodiments, a middle partition wall is arranged in the middle cylinder cavity and is partitioned to form a first side middle cylinder cavity between the middle partition wall and the pressurizing piston and a second side middle cylinder cavity between the middle partition wall and the filling piston, and the energy storage conversion mechanism further comprises an energy accumulator connected with the first side middle cylinder cavity.

In some embodiments, the outer cartridge wall of the intermediate cartridge chamber is provided with a breather valve; and/or the filling cavity is connected with an exhaust valve.

In some embodiments, the grease filling cylinder includes a pressurizing cylinder as the pressurizing portion and a filling cylinder as the grease filling portion, in which piston rods of the pressurizing cylinder extend toward each other, and the energy storage conversion mechanism includes a return spring disposed in a rod chamber of the pressurizing cylinder and a hinge connection portion connecting a piston rod extending end of the pressurizing cylinder and a piston rod extending end of the filling cylinder.

In some embodiments, the pressurizing section is provided with a pressurizing medium inlet and outlet which are integrated with each other.

In some embodiments, the butter filling section comprises:

the grease filling port is provided with a filling one-way valve for preventing oil from flowing back inwards; and

the grease oil suction port is provided with an oil suction one-way valve for preventing oil from flowing outwards.

In some embodiments, the external connection end of the oil suction one-way valve is provided with a pressure detection unit.

In the grease filling cylinder, the pressurizing part and the grease filling part are integrated into a whole oil cylinder, and the energy storage conversion mechanism is arranged in the cylinder and can reset the pressurizing part, so that the control valve position of the electro-hydraulic actuating device can be reduced, and the simplification of control is facilitated. The switching control period of the electro-hydraulic actuating device can be set through the reciprocating movement period of the piston, so that continuous and uninterrupted oiling operation is realized, the structure and the connection driving mode of a control valve piece in a grease filling hydraulic system are simpler, and the control is more accurate and reliable.

Further advantages of the present invention, as well as the technical effects of preferred embodiments, are further described in the following detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a hydraulic schematic diagram of a butter filling cylinder and a butter filling hydraulic system employing the butter filling cylinder, according to an embodiment of the present invention;

fig. 2 and 3 are schematic structural diagrams of a butter filling cylinder according to different embodiments of the utility model.

Description of the reference numerals

1 electrohydraulic actuator 2 control unit

3 pressurizing part 4 butter filling part

5 butter main oil way 6 butter storage jar

7 energy storage conversion mechanism 8 pressure medium oil inlet and return oil path

9 butter filling device assembly 10 butter filling jar

11 pressure detection unit 12 hydraulic pump

13 overflow safety valve and 14 oil suction one-way valve

15 oil tank 16 filling one-way valve

21 pressurizing chamber 22 pressurizing piston

23 first side intermediate cylinder chamber 24 second side intermediate cylinder chamber

25 filling piston 26 filling cavity

27 piston connecting rod 28 return spring

29 middle partition 30 pressurizing oil cylinder

31 pressurized medium inlet and outlet 40 filling oil cylinder

41 butter filling port and 42 butter suction port

50 articulated connection 60 breather valve

Detailed Description

The following detailed description of specific embodiments of the utility model refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the utility model and are not restrictive thereof.

A butter filling cylinder of the present invention is described below with reference to the accompanying drawings.

The utility model discloses a novel butter filling cylinder. In the embodiment shown in fig. 1, the butter filling cylinder 10 comprises:

a pressurizing part 3;

a butter filling part 4 which comprises a filling state for outputting butter outwards and an oil self-sucking state for supplying butter inwards; and

the energy storage switching mechanism 7 is in transmission connection between the pressurization part 3 and the butter filling part 4 and comprises an energy storage state and an energy release state;

wherein, in the energy storage state, the pressurizing pressure of the pressurizing part 3 is partially conducted as the filling pressure of the butter filling part 4 in the filling state and is partially converted into the stored energy of the energy storage conversion mechanism 7, and in the energy release state, the stored energy can be at least partially conducted as the negative self-priming pressure of the butter filling part 4 in the self-priming state.

In the present embodiment, the grease filling cylinder is integrated with three functional portions, namely, a pressurization portion 3, an energy storage switching mechanism 7 and a grease filling portion 4, the pressurization portion 3 has a pressurization state and a pressure relief state, the pressurization portion 3 is pressurized by a introduced pressurization medium (not limited to oil, but compressed air, etc.) to reach the pressurization state, and the pressurization pressure is transmitted to the grease filling portion 4 through the energy storage switching mechanism 7 to be converted into the filling pressure of the grease filling portion 4 in the grease filling state, so that grease can be smoothly filled into the main grease passage 5 outside. On the basis, partial pressurizing pressure of the pressurizing part 3 in a pressurizing state is converted into stored energy of the energy storage conversion mechanism 7, after the pressurizing part 3 is switched to a pressure relief state, the stored energy of the energy storage conversion mechanism 7 is at least partially conducted into oil self-sucking negative pressure of the grease filling part 4 in an oil self-sucking state, grease supplement of the grease filling part 4 is achieved, and grease is supplemented for the filling action of the next period.

In the energy release state of the energy storage conversion mechanism 7, the stored energy can be completely converted into the oil self-priming negative pressure of the grease filling part 4, and further, the stored energy can also be partially converted into the reset pressure of the pressurization part 3 to boost the pressurization part 3 to return to the initial state, so that the piston of the grease filling cylinder 10 can reciprocate, and continuous grease filling is realized. In other words, the resetting of the pressurizing part 3 may be a resetting pushed by, for example, hydraulic oil or the like, or may be driven by the stored energy of the energy storage conversion mechanism 7, as shown in the embodiments of fig. 2 and 3.

Referring to fig. 2, in one embodiment, the butter filling cylinder 10 is an integral cylinder. The grease filling cylinder 10 comprises an outer cylinder barrel internally provided with a pressurizing piston 22 and a filling piston 25, a barrel cavity of the outer cylinder barrel comprises a pressurizing cavity 21 formed between the pressurizing piston 22 and a first end wall (namely, a left end wall in the drawing) of the outer cylinder barrel, a middle barrel cavity formed between the pressurizing piston 22 and the filling piston 25, and a filling cavity 26 formed between the filling piston 25 and a second end wall (namely, a right end wall in the drawing) of the outer cylinder barrel, the pressurizing part 3 comprises the pressurizing piston 22 and the pressurizing cavity 21, the grease filling part 4 comprises the filling piston 25 and the filling cavity 26, and the energy storage conversion mechanism 7 comprises a piston connecting rod 27 which is in rigid connection with the pressurizing piston 22 and the filling piston 25 to move synchronously.

The structure of the grease filling cylinder 10 in the form of an integrated cylinder is more compact, and the pressurizing piston 22 and the filling piston 25 are rigidly connected through a piston connecting rod 27 to ensure synchronous reciprocating movement of the two. The single cylinder structure is simpler, and the transmission has no continuation, thereby being convenient and accurate to control. The energy storage conversion mechanism 7 may further include a return spring 28 disposed in the intermediate cylinder chamber in the axial direction, a first end of the return spring 28 being connected to the pressurizing piston 22, and a second end of the return spring 28 being fixedly disposed. The return spring 28 may be fitted over the piston connecting rod 27 to axially guide the elastic restoring force. During the continuous butter filling operation by the butter filling cylinder 10, a restoring force of the reciprocating motion of the piston is provided by the return spring 28. The return spring 28 with suitable elastic modulus, moving stroke size and other parameters can be specifically selected according to the reciprocating motion requirement of the piston.

It should be noted that the energy storage conversion mechanism 7 is not limited to include the return spring 28, and may also be various types of energy storage devices, including, for example, a compressed gas or liquid energy storage device, or a compressible air structure, etc. During the pressurization process, in which the pressurizing piston 22 moves to the right, the accumulator accumulates energy, and when the pressurizing chamber 21 is depressurized, the accumulator drives the pressurizing piston 22 to move to the left and return.

In fig. 2, the intermediate partition wall 29 is a complete partition wall completely separating the two side chambers, but may be an incomplete partition wall, i.e., the first side intermediate cylinder chamber 23 and the second side intermediate cylinder chamber 24 may communicate with each other. For example, the intermediate partition wall 29 may be an annular wall integrally extending radially inward from the inner peripheral wall of the outer cylinder, and one end of the return spring 28 abuts against the annular wall. The intermediate partition 29 is fixedly, i.e., rigidly, connected to the outer cylinder to receive the compressive elastic force of the return spring 28.

In another embodiment, as shown in fig. 3, the grease filling cylinder 10 includes two associated cylinder bodies, namely, a pressurizing cylinder 30 as the pressurizing portion 3 and a filling cylinder 40 as the grease filling portion 4, the piston rods of which extend toward each other, and the energy storage switching mechanism 7 includes a return spring 28 disposed in the rod chamber of the pressurizing cylinder 30 and a hinge connection portion 50 connecting the piston rod extending end of the pressurizing cylinder 30 and the piston rod extending end of the filling cylinder 40. Wherein, the two piston rods are connected in a hinged manner, and the synchronous reciprocating movement of the pistons can be kept. The rest of the structure is similar to fig. 2.

In addition, the first side middle cylinder chamber 23 in fig. 2 and 3 is connected with an oil tank 15 to return the residual hydraulic oil and communicate with the external atmosphere, and the cylinder wall of the second side middle cylinder chamber 24 is provided with a breather valve 60 or other filtering device to communicate with the external atmosphere and prevent external dust from entering. In addition, an evacuation valve (not shown) may be connected to the filling chamber 26 to allow the filling chamber 26 to be completely evacuated via the evacuation valve when the filling piston 25 is moved to the rightmost position.

In fig. 2 and 3, the pressurizing part 3 is only provided with a pressurizing medium inlet/outlet 31 with an inlet and an outlet in one, that is, the inlet and the outlet are the same, the pressurizing medium inlet/outlet 31 can be connected with the pressurizing medium inlet/outlet oil return oil path 8 shown in fig. 1, and the pressurizing medium inlet/outlet oil return oil path 8 is connected with the oil outlet of the electro-hydraulic actuator 1, that is, the working oil port, to control the oil inlet or oil return of the pressurizing medium inlet/outlet oil path 8, thereby controlling the pressurization or pressure release of the pressurizing part 3 of the grease filling cylinder 10, and further realizing continuous grease filling.

Furthermore, the grease filling cylinder 10, the electro-hydraulic actuator 1 and the control unit 2 may constitute a grease filling device assembly 9 capable of achieving continuous grease filling. The switching control period of the electro-hydraulic actuating device 1 (which is not limited to the electromagnetic reversing valve, the hydraulic control reversing valve and the like) can be set through the reciprocating movement period of the piston, so that continuous and uninterrupted refueling and oil injection operation is realized. In this way, after the butter filling device assembly 9 is started, the control unit 2 only needs to switch and control the electro-hydraulic actuator 1. Further, closed-loop detection and butter filling control can be realized by communicating with a pressure detection unit 11 for monitoring the oil pressure of the butter main oil way 5 in real time, namely combining a pressure detection element 17 arranged at the external connecting end of the oil suction one-way valve 14, which will be further explained below.

Referring to fig. 2 and 3, the butter filling section 4 may include:

a grease filling port 41 provided with a filling check valve 16 for preventing oil from flowing back inwards; and

a butter oil suction port 42 provided with an oil suction check valve 14 for preventing oil from flowing out.

Thus, when applied to the grease filling hydraulic system shown in fig. 1, the grease filling port 41 is connected to the grease main oil passage 5 through a grease filling oil passage to fill grease, and the grease suction port 42 is connected to the grease storage tank 6 through a grease suction oil passage to supply grease to the grease filling section 4.

In the grease filling hydraulic system of fig. 1, grease filling is performed by a hydraulic boosting method, for example. The hydraulic pump 12 pumps pressure oil into the pressurizing part 3 through the electro-hydraulic actuator 1 and the pressurizing medium oil inlet and return oil path 8, and optionally, the pressure range of the pressure oil can be between 3MPa and 10 MPa. The overflow safety valve 13 is used for overflowing and returning oil when the oil pressure of a pumping oil path in front of the electro-hydraulic actuator 1 is too large, and the safety and reliability of the system are maintained.

The grease filling cylinder 10 can be fixed on the body of the engineering machinery by bolts or other fixing methods so as to keep a static state. Pressurized media (such as hydraulic oil, pressure gas and the like) are introduced into the pressurizing cavity 21 through the pressurized medium oil inlet and return oil path 8, the pressurizing piston 22 is driven to move by utilizing the pressurization of the pressurizing cavity 21, the pressure energy is converted into mechanical energy, then the volume of the filling cavity 26 is compressed to be small by utilizing the synchronism of the pressurizing piston 22 and the filling piston 25, grease in the filling cavity 26 is driven to overflow, and therefore the grease can be filled into the grease main oil path 5. Through simple switching control of the electro-hydraulic actuator 1, the electro-hydraulic actuator 1 and the pressurized medium oil inlet and return oil path 8 can be controlled to introduce pressurized medium into the pressurizing cavity 21 to pressurize the pressurizing cavity or the medium pressure of the pressurizing cavity 21 is relieved through the pressurized medium oil inlet and return oil path 8 and the electro-hydraulic actuator 1, so that the pressurizing piston 22 and the filling piston 25 are driven to realize piston reciprocating movement, and reciprocating oil filling and filling operations can be realized.

In particular, the pressurizing cavity 21 is provided with a pressurizing medium inlet and a pressurizing medium outlet with an inlet and an outlet combined into a whole, namely when the inlet and the outlet are the same, the electro-hydraulic actuating device 1 can adopt an electromagnetic directional valve of a two-position three-way valve with a simple structure. Therefore, the valve is simpler and more compact and is convenient to control. It should be noted that, in the present embodiment, an independent hydraulic pump 12 is used to pump pressure oil, but it can be understood by those skilled in the art that, when the hydraulic pump is applied to a construction machine, the hydraulic pump may be an independent hydraulic pump, and may also be a system pressure oil path, etc. which is connected to an oil inlet of the electro-hydraulic actuator 1 to provide pressure oil.

The existing grease filling system generally cannot automatically fill grease, cannot identify whether grease in a grease main oil way is enough or not, has the risk of overhigh grease pressure, needs manual auxiliary operation and judges whether filling is finished or not, has the condition of frequent switching, and is easy to cause faults. Through the structure, the grease filling hydraulic system is provided with the simple and easy-to-operate grease filling cylinder 10 and the electro-hydraulic actuating device 1 in a targeted manner, and the pressure detection unit 11 and the control unit 2 are additionally arranged on the basis, so that automatic grease filling, judgment on whether the grease filling is finished or not, failure in the filling process and the like are realized, and automation, intellectualization and low cost of the grease filling are realized.

Specifically, after the butter filling device assembly 9 is started, the control unit 2 is electrically connected with the electro-hydraulic actuator 1 and the pressure detection unit 11 and obtains an oil pressure detection value of the pressure detection unit 11 in real time, and when it is determined that the oil pressure detection value Ph is lower than a set oil pressure threshold value K1 and a low pressure duration is continuously set, the electro-hydraulic actuator 1 can be controlled to be started and periodically operated in a reversing manner to drive the butter filling cylinder 10 to continuously fill butter; when the oil pressure detection value Ph is determined to be not lower than the set oil pressure threshold value K1 and the high-pressure duration is continuously set, the electro-hydraulic actuator 1 can be controlled to realize pressure relief and oil return of the pressurization cavity 21 and stop butter filling.

In particular, the control unit 2 of the present embodiment may also be configured to: in the process of continuously filling butter, the oil pressure detection value Ph is determined to be lower than a set oil pressure threshold value K1, and the continuous filling time delta T is longer than the set filling time, so that the electro-hydraulic actuator 1 can be controlled to return oil to stop filling butter and remind that the stored butter is insufficient or the filling is in failure. It can be seen that if continuous grease filling occurs during the continuous grease filling process but the oil pressure of the grease main oil path 5 is always insufficient, it can be basically determined that the stored grease in the grease storage tank 6 is insufficient, a warning needs to be sent to quickly replace the grease storage tank 6, or it can be basically determined that a filling fault occurs, and manual maintenance needs to be performed to determine a faulty element, a fault reason and the like.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are in fact significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A butter filling cylinder, characterized in that the butter filling cylinder (10) comprises:

a pressurization part (3);

a butter filling part (4) which comprises a filling state for outputting butter outwards and an oil self-sucking state for supplying butter inwards; and

the energy storage conversion mechanism (7) is in transmission connection between the pressurization part (3) and the grease filling part (4) and comprises an energy storage state and an energy release state;

in the energy storage state, the pressurizing pressure of the pressurizing part (3) is partially conducted to the filling pressure of the butter filling part (4) in the filling state and is partially converted into the stored energy of the energy storage conversion mechanism (7), and in the energy release state, the stored energy can be at least partially conducted to the negative self-priming pressure of the butter filling part (4) in the self-priming state.

2. A butter filling cylinder according to claim 1, characterized in that in the energy released state the stored energy can be at least partly converted into a reset pressure of the pressurization part (3).

3. A grease filling cylinder according to claim 1 or 2, characterized in that the grease filling cylinder (10) comprises an outer cylinder barrel in which a pressurizing piston (22) and a filling piston (25) are arranged, the cylinder cavity of the outer cylinder barrel comprises a pressurizing cavity (21) formed between the pressurizing piston (22) and the first end wall of the outer cylinder barrel, a middle cylinder cavity formed between the pressurizing piston (22) and the filling piston (25), and a filling cavity (26) formed between the filling piston (25) and the second end wall of the outer cylinder barrel, the pressurizing part (3) comprises the pressurizing piston (22) and the pressurizing cavity (21), the butter filling part (4) comprises the filling piston (25) and the filling cavity (26), the energy storage conversion mechanism (7) comprises a piston connecting rod (27) rigidly connecting the pressurizing piston (22) with the filling piston (25) for synchronous piston movement.

4. A butter filling cylinder according to claim 3, characterized in that the energy storage conversion mechanism (7) further comprises a return spring (28) arranged axially in the intermediate cylinder chamber, a first end of the return spring (28) being connected to the pressure piston (22), and a second end of the return spring (28) being fixedly arranged.

5. A butter filling cylinder according to claim 3, characterized in that a middle partition wall (29) is arranged in the middle cylinder chamber and is partitioned to form a first side middle cylinder chamber (23) between the middle partition wall (29) and the pressurizing piston (22) and a second side middle cylinder chamber (24) between the middle partition wall (29) and the filling piston (25), and the energy storage conversion mechanism (7) further comprises an energy accumulator connected with the first side middle cylinder chamber (23).

6. A butter filling cylinder according to claim 3, characterized in that the outer cylinder wall of the intermediate cylinder chamber is provided with a breather valve (60); and/or the filling cavity (26) is connected with an exhaust valve.

7. A butter filling cylinder according to claim 1 or 2, characterized in that the butter filling cylinder (10) comprises a pressurizing cylinder (30) as the pressurizing part (3) and a filling cylinder (40) as the butter filling part (4) with piston rods protruding towards each other, and the energy storage switching mechanism (7) comprises a return spring (28) arranged in a rod cavity of the pressurizing cylinder (30) and a hinge connection part (50) connecting a piston rod protruding end of the pressurizing cylinder (30) with a piston rod protruding end of the filling cylinder (40).

8. A grease filling cylinder according to claim 1, characterized in that the pressurizing part (3) is provided with a pressurizing medium inlet and outlet (31) with an inlet and outlet in one.

9. The butter filling cylinder according to claim 1, characterized in that the butter filling section (4) comprises:

the grease filling port (41) is provided with a filling one-way valve (16) for preventing oil from flowing back inwards; and

the grease suction port (42) is provided with a suction one-way valve (14) for preventing the oil from flowing out.

10. A butter filling cylinder according to claim 9, characterized in that the outer connection end of the oil suction one-way valve (14) is provided with a pressure detection unit (11).