Dual-station hydraulic cylinder of a powder molding machine and powder molding machine

Abstract

The present invention discloses a double-station hydraulic cylinder of a powder forming machine, which includes a first hydraulic cylinder and a second hydraulic cylinder. The first hydraulic cylinder and the second hydraulic cylinder are integrally structured; the first hydraulic cylinder includes a first cylinder block and a first piston rod, and the second hydraulic cylinder includes a second cylinder block and a second piston rod; the internal volume of the first cylinder block is set to be larger than the internal volume of the second cylinder block. The present invention also discloses a powder forming machine including the aforementioned double-station hydraulic cylinder. The double-station hydraulic cylinder of the present invention can switch different hydraulic cylinders at different stages, perform segmented control, be more flexible, and be faster in the reset stage, thereby saving energy consumption and improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the field of powder molding machines, and particularly to a two-station hydraulic cylinder for a powder molding machine. Background Art

[0002] Powder molding machines can be classified into hydraulic, electric, mechanical, etc. according to the driving force. Among them, the hydraulic powder molding machine is driven by a hydraulic cylinder to achieve pressing.

[0003] In the prior art, the hydraulic powder molding machine has only a single-station large hydraulic cylinder, which is used to generate sufficient pressure during the process of pressing workpieces. In fact, the entire process of pressing workpieces includes two stages: the reset stage and the pressing stage; in the reset stage, the load is light and the stroke is fast, and this stage does not require the hydraulic cylinder to generate a large amount of pressure. While in the pressing stage, it is necessary to press the powder raw material into shape, and at this time, the hydraulic cylinder needs to generate a large amount of pressure. Therefore, in the reset stage, the pressure generated by the large hydraulic cylinder is greater than the required pressure, resulting in waste of energy; at the same time, the slower stroke speed of the hydraulic cylinder in this stage also reduces the efficiency of the press.

[0004] In short, the requirements for the hydraulic cylinder are that in the reset stage, the pressure is small and the stroke is fast, and in the pressing stage, the pressure is large and the stroke is slow. Obviously, the existing single-station hydraulic cylinder cannot meet this requirement at the same time.

[0005] Therefore, those skilled in the art are committed to developing a two-station hydraulic cylinder for a powder molding machine, which can provide different pressures and stroke speeds at different stages, with segmented control, more flexible, and a faster reset stage, thereby saving energy consumption and improving work efficiency. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the pressure and stroke speed of the hydraulic cylinder of the powder molding machine can be adjusted during the working process.

[0007] To achieve the above object, the present invention provides a two-station hydraulic cylinder for a powder molding machine, including a first hydraulic cylinder and a second hydraulic cylinder,

[0008] Wherein,

[0009] The first hydraulic cylinder and the second hydraulic cylinder are integrally structured; the first hydraulic cylinder includes a first cylinder body and a first piston rod, and the second hydraulic cylinder includes a second cylinder body and a second piston rod;

[0010] The internal volume of the first cylinder body is set to be larger than the internal volume of the second cylinder body;

[0011] The first piston rod and the second piston rod are integrally formed, or the first piston rod and the second piston rod are connected as a whole in a rigid connection manner.

[0012] Due to the different internal volumes of the two cylinders, different pressures and different piston rod operating speeds can be generated. That is, the first hydraulic cylinder generates a greater pressure and has a slower working stroke, and the second hydraulic cylinder.

[0013] In a preferred embodiment of the present invention, the first cylinder body includes a first upper cover, a first lower cover, and a first cylinder wall. A hollow sealed body is formed by the first upper cover, the first lower cover, and the first cylinder wall.

[0014] Among them,

[0015] The internal space of the sealed body is the first cavity, and the first cavity is used to fill the liquid;

[0016] The first piston rod includes a first rod body and a first piston.

[0017] Among them,

[0018] The first piston is arranged at the middle position of the first rod body, and the first piston is set to be an integral body with the first rod body.

[0019] Or,

[0020] It is connected to the first rod body as an integral body in a rigid connection manner;

[0021] The outer edge of the first piston is in close contact with the first cylinder wall. The first piston can divide the first cavity into two parts: a first upper cavity and a first lower cavity. The first upper cavity and the first lower cavity are two mutually isolated spaces;

[0022] The first upper cover and the first lower cover are provided with openings, and both ends of the first rod body extend out of the first cylinder body through the openings of the first upper cover and the first lower cover respectively.

[0023] The first cylinder body further includes a plurality of openings to realize the liquid flow between the first upper cavity and the first lower cavity

[0024] Furthermore, the second cylinder body includes a second upper cover, a second lower cover, and a second cylinder wall. A hollow sealed body is formed by the second upper cover, the second lower cover, and the second cylinder wall.

[0025] Among them,

[0026] The internal space of the sealed body is the second cavity, and the second cavity is used to fill the liquid;

[0027] The second piston rod includes a second rod body and a second piston. The second piston is arranged at the middle position of the second rod body, and the second piston is set to be an integral body with the second rod body.

[0028] Or,

[0029] It is connected to the second rod body as an integral body in a rigid connection manner;

[0030] The outer edge of the second piston is in close contact with the second cylinder wall. The second piston divides the second cavity into two parts: a second upper cavity and a second lower cavity. The second upper cavity and the second lower cavity are two isolated spaces.

[0031] The second upper cover and the second lower cover are provided with openings. Both ends of the second rod body extend out of the second cylinder through the openings in the second upper cover and the second lower cover.

[0032] The second cylinder also includes a plurality of openings, which are connected to hydraulic pipelines to enable the liquid flow between the second upper cavity and the second lower cavity.

[0033] Furthermore, both the first hydraulic cylinder and the second hydraulic cylinder include their respective control systems, which can control each hydraulic cylinder to work in a pressurized state or an unloaded state.

[0034] Thus, the present invention realizes a double-station hydraulic cylinder of a powder forming machine. In the reset state, the first hydraulic cylinder works in the unloaded state, and the second hydraulic cylinder works in the pressurized state, completing the reset with a smaller pressure and a faster stroke speed. In the pressing stage, the second hydraulic cylinder works in the unloaded state, and the first hydraulic cylinder works in the pressurized state, completing the product pressing with a larger pressure and a slower stroke speed. Different cylinders are switched in different stages for segmented control, which is more flexible and the reset stage is faster, thus saving energy consumption and improving work efficiency.

[0035] In another preferred embodiment of the present invention, the first cylinder body includes a first upper cover, a first lower cover, and a first cylinder wall. A hollow sealed body is formed by the first upper cover, the first lower cover, and the first cylinder wall.

[0036] Among them,

[0037] The internal space of the sealed body is the first cavity, which is used to fill liquid.

[0038] The first piston rod includes a first rod body and a first piston.

[0039] Among them,

[0040] The first piston is arranged at the middle position of the first rod body and is set to be an integral body with the first rod body.

[0041] Or,

[0042] It is connected to the first rod body as an integral body in a rigid connection manner.

[0043] The outer edge of the first piston is in close contact with the first cylinder wall. The first piston can divide the first cavity into two parts: a first upper cavity and a first lower cavity. The first upper cavity and the first lower cavity are two isolated spaces.

[0044] The first upper cover and the first lower cover are provided with openings, and both ends of the first rod body extend out of the first cylinder body through the openings of the first upper cover and the first lower cover.

[0045] The first cylinder body further includes a plurality of openings, which are connected to hydraulic pipelines to enable the liquid between the first upper chamber and the first lower chamber to flow through the hydraulic pipelines.

[0046] Further, the second cylinder body includes a second upper cover and a second cylinder wall.

[0047] Among them,

[0048] One end of the second cylinder wall is connected to the first upper cover, and the other end is connected to the second upper cover;

[0049] The second piston rod and the first piston rod are an integral whole.

[0050] The second piston rod includes a second rod body and a second piston.

[0051] Among them,

[0052] The second piston is arranged at one end of the second rod body close to the second upper cover. The outer edge of the second piston is in close contact with the inner side of the second cylinder wall. The internal space enclosed by the second piston, the second rod body and the first upper cover is the second outer chamber; the second outer chamber is filled with liquid, and there are openings for liquid flow inside the second outer chamber, and the liquid flow with the outside is realized through the hydraulic pipelines connected to the openings.

[0053] Further, a blind hole is arranged inside one end of the second rod body close to the second upper cover. One end of the second upper cover close to the second rod body further includes a third rod body, and the third rod body is integral with the second upper cover.

[0054] Or,

[0055] The third rod body and the second upper cover are connected and integrated in a rigid manner;

[0056] Among them, the shape and size of the third rod body match the blind hole on the second rod body. The top end of the third rod body far from the second upper cover and the blind hole form a sealed space, which is called the second inner chamber. The second inner chamber is filled with liquid, and there are openings for liquid flow inside the second inner chamber, and the liquid flow with the outside is realized through the hydraulic pipelines connected to the openings.

[0057] Further, both the first hydraulic cylinder and the second hydraulic cylinder include their respective control systems, which can control each hydraulic cylinder to work in a pressurized state or an idle state.

[0058] As a preference, the first hydraulic cylinder and the second hydraulic cylinder are filled with oily liquid.

[0059] Thus, the present invention realizes a double-station hydraulic cylinder for another powder forming machine. In the reset state, the first hydraulic cylinder operates in an unloaded state, and the second hydraulic cylinder operates in a pressurized state, completing the reset with a relatively small pressure and a relatively fast stroke speed. In the pressing stage, the second hydraulic cylinder operates in an unloaded state, and the first hydraulic cylinder operates in a pressurized state, completing the product pressing with a relatively large pressure and a relatively slow stroke speed. Different hydraulic cylinders are switched in different stages for segmented control, which is more flexible and the reset stage is faster, thereby saving energy consumption and improving work efficiency. In addition, due to the ingenious use of the second rod body as part of the components of the second hydraulic cylinder, the double-station hydraulic cylinder realized in this embodiment has a smaller volume and lower cost.

[0060] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a structural sectional view of a double-station hydraulic cylinder of a preferred embodiment of the present invention;

[0062] Figure 2 is Figure 1 a schematic diagram after including a control system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] The following introduces multiple preferred embodiments of the present invention with reference to the accompanying drawings of the specification to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0064] In the drawings, components with the same structure are denoted by the same numerical reference signs, and components with similar structures or functions are denoted by similar numerical reference signs. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of some parts in the drawings is appropriately exaggerated.

[0065] Embodiment 1

[0066] Figure 1 and Figure 2 show a double-station hydraulic cylinder of a powder forming machine, including a first hydraulic cylinder and a second hydraulic cylinder,

[0067] wherein,

[0068] the first hydraulic cylinder and the second hydraulic cylinder are integrally formed in structure; the first hydraulic cylinder includes a first cylinder body and a first piston rod, and the second hydraulic cylinder includes a second cylinder body and a second piston rod;

[0069] The first cylinder block is composed of a first upper cover 3, a first lower cover 1, and a first cylinder wall 2. The first upper cover 3, the first lower cover 1, and the first cylinder wall 2 enclose a hollow sealed body.

[0070] Among them,

[0071] The internal space of the sealed body is the first cavity, and the first cavity is used to fill liquid.

[0072] The first piston rod is composed of a first rod body 4 and a first piston 5.

[0073] Among them,

[0074] The first piston 5 is arranged at the middle position of the first rod body 4, and the first piston 5 and the first rod body 4 are an integral whole.

[0075] The outer edge of the first piston 5 is in close contact with the first cylinder wall 2. The first piston 5 can divide the first cavity into two parts: a first upper cavity and a first lower cavity. The first upper cavity and the first lower cavity are two mutually isolated spaces.

[0076] The first upper cover 3 and the first lower cover 1 are provided with openings, and both ends of the first rod body 4 extend out of the first cylinder block through the openings of the first upper cover 3 and the first lower cover 1.

[0077] The first cylinder block further includes a plurality of openings to realize the liquid flow between the first upper cavity 6 and the first lower cavity 7.

[0078] Furthermore, the second cylinder block includes a second upper cover 8 and a second cylinder wall 9.

[0079] Among them,

[0080] One end of the second cylinder wall 9 is connected to the first upper cover 3, and the other end is connected to the second upper cover 8.

[0081] The second piston rod and the first piston rod are an integral whole.

[0082] The second piston rod includes a second rod body 14 and a second piston 10.

[0083] Among them,

[0084] The second piston 10 is arranged at one end of the second rod body 14 close to the second upper cover 8. The outer edge of the second piston 10 is in close contact with the inner side of the second cylinder wall 9. The internal space enclosed by the second piston 10, the second rod body 14, and the first upper cover 3 is the second outer cavity 12. The second outer cavity 12 is filled with liquid, and openings for liquid flow are provided inside the second outer cavity 12.

[0085] Furthermore, a blind hole is arranged inside one end of the second rod body 14 close to the second upper cover 8. One end of the second upper cover 8 close to the second rod body 14 further includes a third rod body 11, and the third rod body 11 is integral with the upper cover.

[0086] Or,

[0087] The third rod body 11 and the second upper cover 8 are integrally connected in a rigid manner;

[0088] Wherein, the shape and size of the third rod body 11 match the blind hole on the second rod body 14. The top end of the third rod body 11 away from the second upper cover 8 forms a sealed space in the blind hole, which is called the second inner cavity 13. The second inner cavity 13 is filled with liquid, and there are openings for the liquid to flow inside the second inner cavity 13.

[0089] Furthermore, both the first hydraulic cylinder and the second hydraulic cylinder include their respective control systems, which can control each hydraulic cylinder to work in a pressurized state or an unloaded state.

[0090] Furthermore,

[0091] The control system is composed of a first valve 15, a second valve 16, a third valve 17, a fourth valve 18 and multiple hydraulic pipelines 19.

[0092] Wherein, the first valve and the third valve are connected to the second outer cavity and the second inner cavity through hydraulic pipelines. The second valve and the fourth valve are connected to the first upper cavity and the first lower cavity through the hydraulic pipeline 19. Its working mode is as follows:

[0093] Reset stage: The first valve 15 and the fourth valve 18 are closed, the second valve 16 is opened to make the first upper cavity and the first lower cavity in a conducting state. When the third valve 17 works, the second hydraulic cylinder does work, and the first hydraulic cylinder does not work. At this time, the rapid movement of the entire double-station hydraulic cylinder can be realized.

[0094] Pressing stage: The second valve 16 and the third valve 17 are closed, the first valve 15 is opened to make the second inner cavity and the second outer cavity in a conducting state. When the fourth valve 18 works, the first hydraulic cylinder does work, and the second hydraulic cylinder does not work. At this time, a relatively large pressure can be generated by the entire double-station hydraulic cylinder for pressing the product, but the moving speed is slower.

[0095] Thus, the present invention realizes a double-station hydraulic cylinder for a powder forming machine. In the reset state, the first hydraulic cylinder works in an unloaded state, and the second hydraulic cylinder works in a pressurized state, completing the reset with a relatively small pressure and a relatively fast stroke speed; in the pressing stage, the second hydraulic cylinder works in an unloaded state, and the first hydraulic cylinder works in a pressurized state, completing the product pressing with a relatively large pressure and a relatively slow stroke speed. Different cylinders are switched in different stages for segmented control, which is more flexible, and the reset stage is faster, thereby saving energy consumption and improving work efficiency. Since the second rod body is used as part of the second hydraulic cylinder, the double-station hydraulic cylinder realized in this embodiment has a smaller volume and lower cost.

[0096] Embodiment 2

[0097] The rest is the same as in Embodiment 1, wherein the states of the first valve 15, the second valve 16, the third valve 17, and the fourth valve 18 of the control system are controlled by a PLC programming controller. The PLC programming controller can precisely control parameters such as the switching timing and working duration of each valve to switch the working state, so as to achieve precise control of the working state of the hydraulic cylinder, save energy, and improve efficiency. In addition, the PLC programming controller is connected to the automatic control interface of the powder molding machine and is incorporated into the automatic control system of the powder molding machine.

[0098] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A double-station hydraulic cylinder of a powder forming machine, characterized in that, It includes a first hydraulic cylinder and a second hydraulic cylinder, and the first hydraulic cylinder and the second hydraulic cylinder are integrally structured; the first hydraulic cylinder includes a first cylinder block and a first piston rod, and the second hydraulic cylinder includes a second cylinder block and a second piston rod; the internal volume of the first cylinder block is set to be larger than the internal volume of the second cylinder block; the first piston rod and the second piston rod are integrally formed, or the first piston rod and the second piston rod are connected into one body in a rigid connection manner; The first cylinder block includes a first upper cover, a first lower cover, and a first cylinder wall. The first upper cover, the first lower cover, and the first cylinder wall enclose a hollow sealed body, and the internal space of the sealed body is a first cavity, and the first cavity is used to fill liquid; the first piston rod includes a first rod body and a first piston. The first piston is arranged at the middle position of the first rod body. The first piston is set to be integrally formed with the first rod body, or is connected into one body with the first rod body in a rigid connection manner; the outer edge of the first piston is in close contact with the first cylinder wall. The first piston divides the first cavity into two parts: a first upper cavity and a first lower cavity. The first upper cavity and the first lower cavity are two isolated spaces; the first upper cover and the first lower cover are provided with openings, and both ends of the first rod body extend out of the first cylinder block through the openings of the first upper cover and the first lower cover; the first cylinder block also includes a plurality of openings to realize the liquid flow between the first upper cavity and the first lower cavity; the second cylinder block includes a second upper cover and a second cylinder wall. One end of the second cylinder wall is connected to the first upper cover, and the other end is connected to the second upper cover; the second piston rod and the first piston rod are integrally formed. The second piston rod includes a second rod body and a second piston. The second piston is arranged at one end of the second rod body close to the second upper cover. The outer edge of the second piston is in close contact with the inner side of the second cylinder wall. The internal space enclosed by the second piston, the second rod body, and the first upper cover is a second outer cavity; the second outer cavity is filled with liquid, and the second outer cavity is provided with openings for liquid flow, and the liquid flow with the outside is realized through the openings; a blind hole is arranged inside one end of the second rod body close to the second upper cover. One end of the second upper cover close to the second rod body further includes a third rod body. The third rod body and the second upper cover are integrally formed, or the third rod body and the second upper cover are connected into one body in a rigid manner; the shape and size of the third rod body match the blind hole on the second rod body. The top end of one end of the third rod body away from the second upper cover and the blind hole form a sealed space, which is called a second inner cavity. The second inner cavity is filled with liquid, and the second inner cavity is provided with openings for liquid flow, and the liquid flow with the outside is realized through the openings; The first hydraulic cylinder and the second hydraulic cylinder further include a control system, and the control system can control each hydraulic cylinder to work in different working states; The control system includes a plurality of hydraulic valves and a plurality of hydraulic pipelines; the hydraulic pipelines are respectively connected to the openings of the first upper chamber, the first lower chamber, the second outer chamber and the second inner chamber; the hydraulic valves are connected to the hydraulic pipelines to control the working states of the first hydraulic cylinder and the second hydraulic cylinder; The control system is composed of four valves, namely a first valve, a second valve, a third valve and a fourth valve, and a plurality of hydraulic pipelines. The first valve and the third valve communicate the second outer chamber and the second inner chamber through the hydraulic pipelines, and the second valve and the fourth valve communicate the first upper chamber and the first lower chamber through the hydraulic pipelines; Its working mode is as follows: Reset stage: The first valve and the fourth valve are closed, the second valve is opened to make the first upper chamber and the first lower chamber in a conducting state. When the third valve works, the second hydraulic cylinder does work and the first hydraulic cylinder does not do work. At this time, the rapid movement of the entire double-station hydraulic cylinder can be realized; Pressing stage: The second valve and the third valve are closed, the first valve is opened to make the second inner chamber and the second outer chamber in a conducting state. When the fourth valve works, the first hydraulic cylinder does work and the second hydraulic cylinder does not do work. At this time, a relatively large pressure can be generated by the entire double-station hydraulic cylinder for pressing products, but the moving speed is slow.

2. A powder molding machine, characterized in that, A double-station hydraulic cylinder of the powder forming machine according to claim 1.

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