Double-layer piston oil cylinder

Abstract

The utility model discloses a double-layer piston oil cylinder, which relates to the technical field of double-layer piston oil cylinders and comprises a cylinder cover, a first cylinder component, a second cylinder component, a valve needle, a base, a first oil inlet and outlet component and a second oil inlet and outlet component. The second cylinder assembly is mounted at one end of the first cylinder assembly; the valve needle is mounted at one end of the second cylinder assembly; the base is installed at one end of the second cylinder assembly. The valve needle is connected with the middle of the base in a sliding and penetrating mode. The first oil inlet and outlet assembly and the second oil inlet and outlet assembly are both installed on the first cylinder assembly and the second cylinder assembly. Through the arrangement mode that the first cylinder assembly and the second cylinder assembly are matched, the first piston and the second piston can conduct double pushing on the valve needle, the valve needle can conduct stable reciprocating linear motion, the problem that a product cavity cannot be sealed due to insufficient oil pressure is solved, and a product can be subjected to smooth injection molding.

Description

Technical Field

[0001] This utility model relates to the field of double-layer piston cylinder technology, and in particular to a double-layer piston cylinder. Background Technology

[0002] The main function of a hydraulic cylinder is to use liquid pressure to drive a piston and its connected components to move in an orderly manner. In a hot runner injection molding system, the hydraulic cylinder needs to precisely control the opening and closing of the hot runner according to different stages of the injection molding process and product requirements. This control process relies on an external control signal, which pushes hydraulic oil from the pump into the oil chamber. The increased pressure in the oil chamber drives the piston rod to move precisely, thus achieving the opening and closing action.

[0003] However, a significant problem exists in existing hydraulic cylinder technology: the piston is prone to retraction during continuous movement. This means that when injection points are close together, large-diameter cylinders cannot be used, while using small-diameter cylinders can lead to insufficient oil pressure during injection, resulting in instability in the effective linear movement of the valve needle and ineffective sealing of the product cavity, thus affecting smooth injection molding. Therefore, a new type of hydraulic cylinder is needed that can effectively solve the problem of small cylinder diameter but high oil pressure. Utility Model Content

[0004] The purpose of this invention is to provide a double-layer piston cylinder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-layer piston cylinder, comprising:

[0006] Cylinder head;

[0007] The first cylinder assembly is installed on one side of the cylinder head;

[0008] The second cylinder assembly is installed at one end of the first cylinder assembly;

[0009] A valve needle is installed at one end of the second cylinder assembly. The first and second cylinder assemblies are used to drive the valve needle to reciprocate linear motion under dual pressure.

[0010] A base is mounted on one end of the second cylinder assembly, and the valve needle is slidably inserted into the middle of the base;

[0011] The first and second oil inlet / outlet assemblies are both installed on the first and second cylinder assemblies. Both the first and second oil inlet / outlet assemblies are connected to the oil pump and are used to supply hydraulic cylinders within the first and second cylinder assemblies.

[0012] Preferably, the first cylinder assembly includes:

[0013] The first cylinder block is installed on one side of the cylinder head and is used to contain hydraulic oil.

[0014] The first piston is disposed in the inner cavity of the first cylinder;

[0015] The first oil chamber and the second oil chamber are both located in the inner cavity of the first cylinder. The first oil chamber and the second oil chamber are used for loading hydraulic oil. The first piston is used to separate the inner cavities of the first oil chamber and the second oil chamber.

[0016] Preferably, the second cylinder assembly includes:

[0017] The second cylinder is installed between the first cylinder and the base, and the first oil inlet / outlet assembly and the second oil inlet / outlet assembly are both installed on the outer walls of the first cylinder and the second cylinder.

[0018] The second piston is disposed in the inner cavity of the second cylinder, and the two ends of the second piston are respectively connected to the first piston and the valve needle;

[0019] The third and fourth oil chambers are both located within the inner cavity of the second cylinder, and the second piston is used to separate the inner cavities of the third and fourth oil chambers.

[0020] Preferably, the first oil inlet / outlet assembly includes:

[0021] The first oil passage is located on the outer wall of the first cylinder block;

[0022] The second oil passage is located on the outer wall of the second cylinder block. The inner cavities of the first and second oil passages are connected, and the first and second oil passages are respectively connected to the inner cavities of the second and fourth oil chambers.

[0023] Preferably, the second oil inlet / outlet assembly includes:

[0024] The third oil passage is located on the side of the first cylinder block away from the first oil passage;

[0025] The fourth oil passage is located on the side of the second cylinder block away from the second oil passage. The inner cavities of the third and fourth oil passages are connected, and the third and fourth oil passages are respectively connected to the inner cavities of the first and third oil chambers.

[0026] Preferred options also include:

[0027] A Glyd ring, installed on the first cylinder assembly and the second cylinder assembly, is used to prevent hydraulic oil leakage;

[0028] Seals are installed at adjacent connections of the cylinder head, the first cylinder assembly, and the second cylinder assembly;

[0029] The cooling water system is installed on the second cylinder assembly.

[0030] The technical effects and advantages of this utility model are as follows:

[0031] This invention utilizes a combination of a first cylinder assembly and a second cylinder assembly to enable the first piston to push the second piston. This allows the first and second pistons to perform a dual push on the valve needle, resulting in stable reciprocating linear motion of the valve needle. This reduces the problem of insufficient oil pressure causing the product cavity to fail to seal, and allows the product to be successfully injection molded. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall AA side sectional structure of this utility model.

[0033] Figure 2 This is a schematic diagram of the overall BB side cross-sectional structure of this utility model.

[0034] Figure 3 This is a schematic diagram of the overall front view of the present utility model.

[0035] In the diagram: 1. Cylinder head; 2. First cylinder assembly; 21. First cylinder block; 22. First piston; 23. First oil chamber; 24. Second oil chamber; 3. Second cylinder assembly; 31. Second cylinder block; 32. Second piston; 33. Third oil chamber; 34. Fourth oil chamber; 4. Valve needle; 5. Base; 6. First oil inlet / outlet assembly; 61. First oil passage; 62. Second oil passage; 7. Second oil inlet / outlet assembly; 71. Third oil passage; 72. Fourth oil passage; 8. Gladley ring; 9. Seal; 10. Cooling water passage. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example 1

[0038] This utility model provides, for example Figure 1-3A double-layer piston cylinder is shown, comprising: a cylinder head 1, a first cylinder assembly 2, a second cylinder assembly 3, a valve needle 4, a base 5, a first inlet / outlet oil assembly 6, and a second inlet / outlet oil assembly 7. The cylinder head 1 is used to limit the stroke of the piston reciprocating motion. The first cylinder assembly 2 is mounted on one side of the cylinder head 1 and includes: a first cylinder body 21, a first piston 22, a first oil chamber 23, and a second oil chamber 24. The first cylinder body 21 is mounted on one side of the cylinder head 1 and is fixed to the cylinder head 1 by locking screws. The first cylinder body 21 is used for... The cylinder contains hydraulic oil. A first piston 22 is disposed in the inner cavity of a first cylinder 21. A first oil chamber 23 and a second oil chamber 24 are both distributed in the inner cavity of the first cylinder 21. The first oil chamber 23 and the second oil chamber 24 are used for loading hydraulic oil. The first piston 22 is used to separate the inner cavities of the first oil chamber 23 and the second oil chamber 24. The first piston 22 is used to perform reciprocating linear motion between the first oil chamber 23 and the second oil chamber 24 under the pressure of the hydraulic oil. The size of the first oil chamber 23 and the second oil chamber 24 is adjusted according to the stroke of the first piston 22.

[0039] The second cylinder assembly 3 is installed at one end of the first cylinder assembly 2, and the valve needle 4 is installed at one end of the second cylinder assembly 3. The second cylinder assembly 3 includes: a second cylinder body 31, a second piston 32, a third oil chamber 33, and a fourth oil chamber 34. The second cylinder body 31 is installed between the first cylinder body 21 and the base 5. The second piston 32 is disposed in the inner cavity of the second cylinder body 31, and the two ends of the second piston 32 are respectively connected to the first piston 22 and the valve needle 4. The third oil chamber 33 and the fourth oil chamber 34 are both distributed in the inner cavity of the second cylinder body 31. The inner cavities of the third oil chamber 33 and the fourth oil chamber 34 are filled with hydraulic oil. The second piston 32 is used to separate the inner cavities of the third oil chamber 33 and the fourth oil chamber 34. By allowing oil to enter the inner cavities of the third oil chamber 33 and the fourth oil chamber 34 respectively, the second piston 32 can perform reciprocating linear motion in the inner cavity of the second cylinder body 31.

[0040] The first cylinder assembly 2 and the second cylinder assembly 3 are used to drive the valve needle 4 to perform reciprocating linear motion under dual pressure. Through the connection between the valve needle 4 and the second piston 32 and the connection between the second piston 32 and the first piston 22, the valve needle 4 can perform dual thrust. Compared with the existing technology, the additional pressure of the first piston 22 increases the total thrust and total pull of the cylinder, achieving the purpose of small cylinder diameter and large cylinder pressure. The base 5 is installed at one end of the second cylinder assembly 3, and the valve needle 4 is slidably inserted into the middle of the base 5. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both installed on the first cylinder assembly 2 and the second cylinder assembly 3. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both connected to the oil pump and are used to supply the hydraulic cylinders in the first cylinder assembly 2 and the second cylinder assembly 3. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both installed on the outer wall of the first cylinder body 21 and the second cylinder body 31.

[0041] The first oil inlet / outlet assembly 6 includes a first oil passage 61 and a second oil passage 62. The first oil passage 61 is located on the outer wall of the first cylinder 21, and the second oil passage 62 is located on the outer wall of the second cylinder 31. The inner cavities of the first oil passage 61 and the second oil passage 62 are connected, and the first oil passage 61 and the second oil passage 62 are respectively connected to the inner cavities of the second oil chamber 24 and the fourth oil chamber 34. The second oil inlet / outlet assembly 7 includes a third oil passage 71 and a fourth oil passage 72. The third oil passage 71 is located on the side of the first cylinder 21 away from the first oil passage 61, and the fourth oil passage 72 is located on the outer wall of the second cylinder 31. On the side away from the second oil passage 62, the inner cavities of the third oil passage 71 and the fourth oil passage 72 are connected, and the third oil passage 71 and the fourth oil passage 72 are respectively connected to the inner cavities of the first oil chamber 23 and the third oil chamber 33. After the hydraulic oil is output from the oil pump, the oil passes through the third oil passage 71 and the fourth oil passage 72 and enters the inner cavities of the first oil chamber 23 and the third oil chamber 33. The pressure in the first oil chamber 23 and the third oil chamber 33 increases, pushing the first piston 22, the second piston 32 and the valve needle 4 to move forward. After the product injection is completed, the oil pressure in the third oil passage 71 and the fourth oil passage 72 decreases. The first oil passage 61 and the second oil passage 62 are pressurized and the hydraulic oil enters the inner cavities of the second oil chamber 24 and the fourth oil chamber 34 through the first oil passage 61 and the second oil passage 62. The pressure in the inner cavities of the second oil chamber 24 and the fourth oil chamber 34 increases, pushing the first piston 22, the second piston 32 and the valve needle 4 to move backward, completing the entire injection process.

[0042] Example 2:

[0043] This utility model provides, for example Figure 1-3 A double-layer piston cylinder is shown, comprising: a cylinder head 1, a first cylinder assembly 2, a second cylinder assembly 3, a valve needle 4, a base 5, a first inlet / outlet oil assembly 6, and a second inlet / outlet oil assembly 7. The cylinder head 1 is used to limit the stroke of the piston reciprocating motion. The first cylinder assembly 2 is mounted on one side of the cylinder head 1 and includes: a first cylinder body 21, a first piston 22, a first oil chamber 23, and a second oil chamber 24. The first cylinder body 21 is mounted on one side of the cylinder head 1 and is fixed to the cylinder head 1 by locking screws. The first cylinder body 21 is used for... The cylinder contains hydraulic oil. A first piston 22 is disposed in the inner cavity of a first cylinder 21. A first oil chamber 23 and a second oil chamber 24 are both distributed in the inner cavity of the first cylinder 21. The first oil chamber 23 and the second oil chamber 24 are used for loading hydraulic oil. The first piston 22 is used to separate the inner cavities of the first oil chamber 23 and the second oil chamber 24. The first piston 22 is used to perform reciprocating linear motion between the first oil chamber 23 and the second oil chamber 24 under the pressure of the hydraulic oil. The size of the first oil chamber 23 and the second oil chamber 24 is adjusted according to the stroke of the first piston 22.

[0044] The second cylinder assembly 3 is installed at one end of the first cylinder assembly 2, and the valve needle 4 is installed at one end of the second cylinder assembly 3. The second cylinder assembly 3 includes: a second cylinder body 31, a second piston 32, a third oil chamber 33, and a fourth oil chamber 34. The second cylinder body 31 is installed between the first cylinder body 21 and the base 5. The second piston 32 is disposed in the inner cavity of the second cylinder body 31, and the two ends of the second piston 32 are respectively connected to the first piston 22 and the valve needle 4. The third oil chamber 33 and the fourth oil chamber 34 are both distributed in the inner cavity of the second cylinder body 31. The inner cavities of the third oil chamber 33 and the fourth oil chamber 34 are filled with hydraulic oil. The second piston 32 is used to separate the inner cavities of the third oil chamber 33 and the fourth oil chamber 34. By allowing oil to enter the inner cavities of the third oil chamber 33 and the fourth oil chamber 34 respectively, the second piston 32 can perform reciprocating linear motion in the inner cavity of the second cylinder body 31.

[0045] The first cylinder assembly 2 and the second cylinder assembly 3 are used to drive the valve needle 4 to perform reciprocating linear motion under dual pressure. Through the connection between the valve needle 4 and the second piston 32 and the connection between the second piston 32 and the first piston 22, the valve needle 4 can perform dual thrust. Compared with the existing technology, the additional pressure of the first piston 22 increases the total thrust and total pull of the cylinder, achieving the purpose of small cylinder diameter and large cylinder pressure. The base 5 is installed at one end of the second cylinder assembly 3, and the valve needle 4 is slidably inserted into the middle of the base 5. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both installed on the first cylinder assembly 2 and the second cylinder assembly 3. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both connected to the oil pump and are used to supply the hydraulic cylinders in the first cylinder assembly 2 and the second cylinder assembly 3. The first inlet / outlet oil assembly 6 and the second inlet / outlet oil assembly 7 are both installed on the outer wall of the first cylinder body 21 and the second cylinder body 31.

[0046] The first oil inlet / outlet assembly 6 includes a first oil passage 61 and a second oil passage 62. The first oil passage 61 is located on the outer wall of the first cylinder 21, and the second oil passage 62 is located on the outer wall of the second cylinder 31. The inner cavities of the first oil passage 61 and the second oil passage 62 are connected, and the first oil passage 61 and the second oil passage 62 are respectively connected to the inner cavities of the second oil chamber 24 and the fourth oil chamber 34. The second oil inlet / outlet assembly 7 includes a third oil passage 71 and a fourth oil passage 72. The third oil passage 71 is located on the side of the first cylinder 21 away from the first oil passage 61, and the fourth oil passage 72 is located on the outer wall of the second cylinder 31. On the side away from the second oil passage 62, the inner cavities of the third oil passage 71 and the fourth oil passage 72 are connected, and the third oil passage 71 and the fourth oil passage 72 are respectively connected to the inner cavities of the first oil chamber 23 and the third oil chamber 33. After the hydraulic oil is output from the oil pump, the oil passes through the third oil passage 71 and the fourth oil passage 72 and enters the inner cavities of the first oil chamber 23 and the third oil chamber 33. The pressure in the first oil chamber 23 and the third oil chamber 33 rises, pushing the first piston 22, the second piston 32 and the valve needle 4 to move forward. After the product injection is completed, the oil pressure in the third oil passage 71 and the fourth oil passage 72 decreases. The first oil passage 61 and the second oil passage 62 are pressurized and the hydraulic oil enters the inner cavities of the second oil chamber 24 and the fourth oil chamber 34 through the first oil passage 61 and the second oil passage 62. The pressure in the inner cavities of the second oil chamber 24 and the fourth oil chamber 34 rises, pushing the first piston 22, the second piston 32 and the valve needle 4 to move backward, completing the entire injection process.

[0047] It also includes: a Glyd ring 8, a seal 9, and a cooling water passage 10. The Glyd ring 8 is installed on the first cylinder assembly 2 and the second cylinder assembly 3. Multiple Glyd rings 8 are respectively installed on the outer wall of the first piston 22 and the outer wall of the second piston 32. The Glyd rings are used to increase the sealing between the first piston 22 and the second piston 32 and the first cylinder body 21 and the second cylinder body 31, respectively. The Glyd ring 8 is used to prevent hydraulic oil leakage. The seal 9 is installed at the adjacent connection of the cylinder head 1, the first cylinder assembly 2, and the second cylinder assembly 3. Multiple seals 9 are respectively installed between the first cylinder body 21 and the cylinder head 1, between the first cylinder body 21 and the second cylinder body 22, and between the second piston 32 and the second cylinder body 22 to prevent hydraulic cylinder leakage. The cooling water passage 10 is installed on the second cylinder assembly 3. The cooling water passage 10 is used to maintain a certain temperature of the cylinder so that the cylinder can maintain efficient operation.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-layer piston cylinder, characterized in that, include: Cylinder head (1); The first cylinder assembly (2) is installed on one side of the cylinder head (1); The second cylinder assembly (3) is installed at one end of the first cylinder assembly (2); The valve needle (4) is installed at one end of the second cylinder assembly (3). The first cylinder assembly (2) and the second cylinder assembly (3) are used to push the valve needle (4) to reciprocate linear motion under dual pressure. The base (5) is installed at one end of the second cylinder assembly (3), and the valve needle (4) is slidably inserted into the middle of the base (5); The first inlet / outlet oil assembly (6) and the second inlet / outlet oil assembly (7) are both installed on the first cylinder assembly (2) and the second cylinder assembly (3). The first inlet / outlet oil assembly (6) and the second inlet / outlet oil assembly (7) are both connected to the oil pump and are used to supply hydraulic cylinders in the first cylinder assembly (2) and the second cylinder assembly (3).

2. A double-layer piston cylinder according to claim 1, characterized in that, The first cylinder assembly (2) includes: The first cylinder body (21) is installed on one side of the cylinder head (1) and is used to contain hydraulic oil; The first piston (22) is disposed in the inner cavity of the first cylinder (21); The first oil chamber (23) and the second oil chamber (24) are both located in the inner cavity of the first cylinder (21). The first oil chamber (23) and the second oil chamber (24) are used for loading hydraulic oil. The first piston (22) is used to separate the inner cavities of the first oil chamber (23) and the second oil chamber (24).

3. A double-layer piston cylinder according to claim 2, characterized in that, The second cylinder assembly (3) includes: The second cylinder (31) is installed between the first cylinder (21) and the base (5), and the first oil inlet / outlet assembly (6) and the second oil inlet / outlet assembly (7) are both installed on the outer walls of the first cylinder (21) and the second cylinder (31); The second piston (32) is disposed in the inner cavity of the second cylinder (31), and the two ends of the second piston (32) are respectively connected to the first piston (22) and the valve needle (4); The third oil chamber (33) and the fourth oil chamber (34) are both located in the inner cavity of the second cylinder (31), and the second piston (32) is used to separate the inner cavities of the third oil chamber (33) and the fourth oil chamber (34).

4. A double-layer piston cylinder according to claim 3, characterized in that, The first oil inlet / outlet assembly (6) includes: The first oil passage (61) is located on the outer wall of the first cylinder block (21); The second oil passage (62) is opened on the outer wall of the second cylinder (31). The inner cavities of the first oil passage (61) and the second oil passage (62) are connected, and the first oil passage (61) and the second oil passage (62) are respectively connected to the inner cavities of the second oil chamber (24) and the fourth oil chamber (34).

5. A double-layer piston cylinder according to claim 4, characterized in that, The second oil inlet / outlet assembly (7) includes: The third oil passage (71) is located on the side of the first cylinder block (21) away from the first oil passage (61); The fourth oil passage (72) is located on the side of the second cylinder (31) away from the second oil passage (62). The inner cavities of the third oil passage (71) and the fourth oil passage (72) are connected, and the third oil passage (71) and the fourth oil passage (72) are connected to the inner cavities of the first oil cavity (23) and the third oil cavity (33), respectively.

6. A double-layer piston cylinder according to claim 1, characterized in that, Also includes: A glyph ring (8) is installed on the first cylinder assembly (2) and the second cylinder assembly (3), the glyph ring (8) being used to prevent leakage of hydraulic oil; Seals (9) are installed at the adjacent connection points of cylinder head (1), first cylinder assembly (2), and second cylinder assembly (3); Cooling water passage (10) is installed on the second cylinder assembly (3).

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