High-pressure miniature oil cylinder

Abstract

The utility model provides a high-pressure miniature oil cylinder which comprises a cylinder body (1), a piston (2) and a sealing oil conveying screw (3), a piston chamber matched with the piston (2) in a sealing mode is arranged in the cylinder body (1), the sealing oil conveying screw (3) comprises a nut (31) and a screw body (32), one end of the screw body (32) is fixedly connected to the bottom of the nut (31), and the other end of the screw body (32) is fixedly connected to the bottom of the piston (2). The piston (2) is connected with a piston chamber of the cylinder body (1) in a sealed and matched mode, the other end of the screw body (32) is connected with the piston (2) or the cylinder body (1) in a threaded and sealed mode, an oil storage chamber (21) is arranged between the cylinder body (1) and the piston (2) in the longitudinal direction, and a longitudinal screw oil channel (321) is formed in the side wall of the screw body (32). The screw oil channel (321) penetrates through the outer end of the screw body (32) and is communicated with the oil storage chamber (21) in a sealed mode. The oil seal is small in size, good in sealing performance and not prone to oil leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pressure systems, in particular to a high-pressure micro oil cylinder. Background Art

[0002] At present, the micro high-pressure oil cylinder is installed with relevant piston rings and sealing rings on the piston, so that the piston ring of the piston is tightly fitted to the inner wall of the cylinder body and maintains a high-pressure sealing state to prevent the high-pressure oil from seeping through the piston ring and the inner wall of the cylinder body. The micro high-pressure oil cylinder is an important component of in-mold hot cutting, and the integration and matching requirements of the in-mold hot cutting system and the mold are extremely strict, otherwise the mold will have many serious problems during the production process. Therefore, the structure and installation precision of the micro high-pressure oil cylinder are very high. The disadvantages of the micro high-pressure oil cylinder in the prior art are large size, poor sealing, and easy oil leakage.

[0003] In view of this, a high-pressure micro-cylinder is needed to solve the deficiencies of the prior art. Utility Model Content

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a high-pressure micro-cylinder with small volume, good sealing and low oil leakage.

[0005] In order to solve the above technical problems, the utility model provides a high-pressure micro-cylinder, which includes a cylinder body, a piston and a sealed oil delivery screw. The cylinder body is provided with a piston chamber that is sealed with the piston. The sealed oil delivery screw includes a nut and a screw body. One end of the screw body is fixed to the bottom of the nut, the piston is sealed and connected to the piston chamber of the cylinder body, and the other end of the screw body is sealed and connected to the piston or cylinder body thread. An oil storage chamber is provided longitudinally between the cylinder body and the piston, and a longitudinal screw oil channel is opened on the side wall of the screw body. The screw oil channel runs through the outer end of the screw body and is sealed and connected to the oil storage chamber.

[0006] A further improvement of the utility model is that the side wall of the piston is provided with a high-pressure sealing ring, a low-pressure sealing ring and an oil scraping sealing ring in sequence.

[0007] A further improvement of the utility model is that an oil-proof sealing ring is provided on the outer side wall of the cylinder body.

[0008] A further improvement of the utility model is that the number of the oil-proof sealing rings is 2.

[0009] A further improvement of the utility model is that a sealing ring is provided at the bottom of the cylinder body or the bottom of the piston.

[0010] A further improvement of the utility model is that the bottom of the oil storage chamber is in an arc shape, a sharp angle shape or a flat bottom shape.

[0011] A further improvement of the utility model is that the screw oil channel is in a groove shape or a plane shape.

[0012] A further improvement of the utility model is that a ejection boss is provided on the top of the cylinder body.

[0013] A further improvement of the utility model is that the length of the piston chamber is greater than the length of the piston.

[0014] A further improvement of the utility model is that a top block is further provided on the piston, a stopper is further provided on the cylinder body, a through hole is provided in the middle of the stopper, a hanging platform is provided at the bottom of the top block, the top block loosely passes through the through hole of the stopper and the hanging platform can hang on the stopper.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The screw oil channel is opened on the side wall of the screw body, which is easy to process and low in cost;

[0017] 2. There is a sealing ring at the bottom of the cylinder or the bottom of the piston, and an oil-proof sealing ring is also provided on the outer wall of the cylinder. Three seals are used: high-pressure sealing ring, low-pressure sealing ring, and oil-scraping sealing ring, which have good sealing performance and are not easy to leak oil;

[0018] 3. Compact structure and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of the second embodiment of the utility model;

[0021] Figure 3 Is a schematic diagram of the internal structure of the utility model implementation method three;

[0022] Figure 4 It is a schematic diagram of the internal structure of the utility model embodiment four;

[0023] Figure 5 Is a schematic diagram of the three-dimensional structure of the fourth embodiment of the utility model;

[0024] Figure 6 yes Figure 5 Schematic diagram of three-dimensional unfolded structure;

[0025] Figure 7 It is a schematic diagram of the internal structure of the fifth embodiment of the present utility model.

[0026] The names of the components in the figure are as follows:

[0027] 1—cylinder body;

[0028] 11—Ejector boss;

[0029] 2—piston;

[0030] 21—Oil storage room;

[0031] 22—Oil delivery channel;

[0032] 3—Sealing oil delivery screw;

[0033] 31—nut;

[0034] 32—screw body;

[0035] 321—screw oil channel;

[0036] 4—High pressure sealing ring;

[0037] 5—Low-pressure sealing ring;

[0038] 6—Oil scraper seal ring;

[0039] 7—Oil-proof sealing ring;

[0040] 8—top block;

[0041] 9—Block. DETAILED DESCRIPTION

[0042] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Implementation Method 1

[0044] like Figure 1 As shown, a high-pressure micro-cylinder comprises a cylinder body 1, a piston 2 and a sealed oil delivery screw 3, wherein a piston chamber which is sealed with the piston 2 is provided in the cylinder body 1, the sealed oil delivery screw 3 comprises a nut 31 and a screw body 32, one end of the screw body 32 is fixedly connected to the bottom of the nut 31, the piston 2 is placed in the cylinder body 1 and is sealed with the piston chamber, the other end of the screw body 32 is threadedly sealed with the cylinder body 1, an oil storage chamber 21 is provided between the cylinder body 1 and the piston 2 longitudinally, a longitudinal screw oil passage 321 is opened on the side wall of the screw body 32, the screw oil passage 321 passes through the outer end of the screw body 32 and is sealed and connected with the oil storage chamber 21.

[0045] Specifically, Figure 1As shown, the side wall of the piston 2 is provided with a high-pressure sealing ring 4, a low-pressure sealing ring 5, and an oil scraping sealing ring 6 in sequence. The low-pressure sealing ring 5 is a Gly ring, and the oil scraping sealing ring 6 is an O-ring. A sealing ring is provided at the bottom of the cylinder body 1. The length of the piston chamber is greater than the length of the piston 2. The bottom of the oil storage chamber 21 is pointed or flat. The screw oil passage 321 is a U-shaped groove opened on the side of the screw, or a flat position is ground on the side of the screw.

[0046] Working principle of the first embodiment: high-pressure oil enters the oil storage chamber 21 from the screw oil passage 321, and the piston 2 is pushed outward under the pressure of the high-pressure oil.

[0047] Implementation Method 2

[0048] like Figure 2 As shown, a high-pressure micro-cylinder comprises a cylinder body 1, a piston 2 and a sealed oil delivery screw 3, wherein a piston chamber which is sealed with the piston 2 is provided in the cylinder body 1, the sealed oil delivery screw 3 comprises a nut 31 and a screw body 32, one end of the screw body 32 is fixedly connected to the bottom of the nut 31, the piston 2 is sealed and connected with the piston chamber of the cylinder body 1, the other end of the screw body 32 is threadedly sealed and connected with the piston 2, an oil storage chamber 21 is provided between the cylinder body 1 and the piston 2 longitudinally, a longitudinal screw oil passage 321 is opened on the side wall of the screw body 32, the screw oil passage 321 passes through the outer end of the screw body 32 and is sealed and connected with the oil storage chamber 21.

[0049] Specifically, Figure 2 As shown, the piston 2 is divided into two sections, the lower section of the piston 2 has a larger diameter than the upper section. The side wall of the upper section of the piston 2 is provided with a high-pressure sealing ring 4, a low-pressure sealing ring 5, and an oil scraping sealing ring 6 in sequence, and the upper section of the piston 2 is movably sealed and connected to the cylinder body 1. The low-pressure sealing ring 5 adopts a Gley ring, and the oil scraping sealing ring 6 adopts an O-ring. The lower section of the piston 2 is threadedly sealed and connected to the sealing oil delivery screw 3, and a sealing ring is provided at the bottom of the lower section of the piston 2. The length of the piston chamber is greater than the length of the upper section of the piston 2. The bottom of the oil storage chamber 21 is arc-shaped. The screw oil passage 321 is a U-shaped groove opened on the side of the screw, or a flat position is ground on the side of the screw. An oil delivery channel 22 is provided in the middle of the piston 2, and the oil delivery channel 22 is connected to the oil storage chamber 21 and the screw oil passage 321 respectively. Two O-type oil-proof sealing rings 7 are provided on the outer side wall of the cylinder body 1. A top boss 11 is provided on the top of the cylinder body 1.

[0050] Working principle of the second embodiment: high-pressure oil enters the oil storage chamber 21 from the screw oil passage 321, and the cylinder body 1 is pushed outward under the pressure of the high-pressure oil.

[0051] Implementation Method 3

[0052] like Figure 3 As shown, the third embodiment is basically the same as the first embodiment, except that the depth of the piston chamber of the cylinder body 1 is 2-6 mm longer than the total height of the piston 2. In this embodiment, the depth of the piston chamber is 4.5 mm longer than the total height of the piston 2.

[0053] Implementation Method 4

[0054] like Figure 4-Figure 6 As shown, a high-pressure micro oil cylinder comprises a cylinder body 1, a piston 2 and a sealed oil delivery screw 3, wherein a piston chamber which is sealed with the piston 2 is provided in the cylinder body 1, and the sealed oil delivery screw 3 comprises a nut 31 and a screw body 32, one end of the screw body 32 is fixedly connected to the bottom of the nut 31, the piston 2 is placed in the cylinder body 1 and is sealed with the piston chamber, and the other end of the screw body 32 is threadedly sealed with the cylinder body 1, and an oil storage chamber 21 is provided between the cylinder body 1 and the piston 2 in the longitudinal direction, and a longitudinal screw oil passage 321 is provided on the side wall of the screw body 32, and the screw oil passage 321 passes through the outer end of the screw body 32 and is sealed and connected with the oil storage chamber 21. The depth of the piston chamber of the cylinder body 1 is 2-6 mm longer than the total height of the piston 2, and in this embodiment, the depth of the piston chamber is 3.5 mm longer than the total height of the piston 2. A top block 8 is movably provided on the piston 2, and a stopper 9 is fixedly provided on the cylinder body 1. A through hole is provided in the middle of the stopper 9, and a hanging platform is provided at the bottom of the top block 8. The top block 8 loosely passes through the through hole of the stopper 9 and the hanging platform can hang on the stopper 9. The stopper 9 is used to prevent the top block 8 from falling out.

[0055] Specifically, Figure 4-Figure 6 As shown, the side wall of the piston 2 is provided with a high-pressure sealing ring 4, a low-pressure sealing ring 5, and an oil scraping sealing ring 6 in sequence. The low-pressure sealing ring 5 is a Gly ring, and the oil scraping sealing ring 6 is an O-ring. A sealing ring is provided at the bottom of the cylinder body 1. The bottom of the oil storage chamber 21 is a pointed angle or a flat bottom. The screw oil passage 321 is a U-shaped groove opened on the side of the screw, or a flat position is ground on the side of the screw.

[0056] Working principle of the fourth embodiment: high-pressure oil enters the oil storage chamber 21 from the screw oil passage 321, and the piston 2 is pushed outward under the pressure of the high-pressure oil, thereby pushing the ejector block 8 outward together.

[0057] Implementation Method 5

[0058] like Figure 7 As shown, the fifth embodiment is basically the same as the second embodiment, except that the piston 2 is a whole, not segmented, and the piston 2 is completely placed in the piston chamber of the cylinder body 1. The length of the piston 2 is 0.5-3 mm longer than the length of the piston chamber of the cylinder body 1, and 1.0 mm is selected in this embodiment. The diameter of the oil delivery channel 22 of the fifth embodiment is larger than the diameter of the oil delivery channel 22 of the second embodiment.

[0059] Working principle of the first embodiment: high-pressure oil enters the oil storage chamber 21 from the screw oil passage 321, and the cylinder body 1 is pushed outward under the pressure of the high-pressure oil.

[0060] Beneficial effects of the utility model:

[0061] 1. The screw oil channel is opened on the side wall of the screw body, which is easy to process and low in cost;

[0062] 2. There is a sealing ring at the bottom of the cylinder or the bottom of the piston, and an oil-proof sealing ring is also provided on the outer wall of the cylinder. Three seals are used: high-pressure sealing ring, low-pressure sealing ring, and oil-scraping sealing ring, which have good sealing performance and are not easy to leak oil;

[0063] 3. Compact structure and small size.

[0064] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A high-pressure micro oil cylinder, comprising a cylinder body (1), a piston (2) and a sealed oil delivery screw (3), wherein the cylinder body (1) is provided with a piston chamber which is sealed with the piston (2), the sealed oil delivery screw (3) comprises a nut (31) and a screw body (32), one end of the screw body (32) is fixed to the bottom of the nut (31), the piston (2) is sealed with the piston chamber of the cylinder body (1), and the other end of the screw body (32) is threadedly sealed with the piston (2) or the cylinder body (1), Features: An oil storage chamber (21) is provided between the cylinder body (1) and the piston (2) in the longitudinal direction, and a longitudinal screw oil passage (321) is provided on the side wall of the screw body (32). The screw oil passage (321) passes through the outer end of the screw body (32) and is sealed and connected to the oil storage chamber (21).

2. A high-pressure micro cylinder according to claim 1, Features: The side wall of the piston (2) is provided with a high-pressure sealing ring (4), a low-pressure sealing ring (5), and an oil scraping sealing ring (6) in sequence.

3. A high-pressure micro cylinder according to claim 1, Features: An oil-proof sealing ring (7) is provided on the outer side wall of the cylinder body (1).

4. A high-pressure micro cylinder according to claim 3, Features: The number of the oil-proof sealing rings (7) is 2.

5. A high-pressure micro cylinder according to claim 1, Features: A sealing ring is provided at the bottom of the cylinder body (1) or the bottom of the piston (2).

6. A high-pressure micro cylinder according to claim 1, Features: The bottom of the oil storage chamber (21) is in an arc shape, a sharp angle shape or a flat bottom shape.

7. A high-pressure micro cylinder according to claim 1, Features: The screw oil passage (321) is in a groove shape or a plane shape.

8. A high-pressure micro cylinder according to claim 1, Features: The top of the cylinder body (1) is provided with an ejection boss (11).

9. A high-pressure micro cylinder according to claim 1, Features: The length of the piston chamber is greater than the length of the piston (2).

10. A high-pressure micro cylinder according to claim 1, Features: The piston (2) is also provided with a top block (8), and the cylinder body (1) is also provided with a stopper (9). A through hole is provided in the middle of the stopper (9), and a hanging platform is provided at the bottom of the top block (8). The top block (8) is loosely passed through the through hole of the stopper (9), and the hanging platform can hang on the stopper (9).

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