Hydraulic cylinder oil inlet connecting block oil leakage prevention structure

Abstract

The utility model relates to a kind of hydraulic cylinder oil inlet connecting block oil leakage prevention structure, belong to hydraulic cylinder oil inlet auxiliary part technical field, the structure includes plane sealing element, it is installed in the position where first oil passage is connected with low pressure oil hole;Sealing pipe has first section and second section, first counterbore is set at the orifice of second oil passage, second counterbore is set at the orifice of high pressure oil hole, first section and second section are respectively inserted in first counterbore and second counterbore, sealing pipe is connected second oil passage and high pressure oil hole, first section and second section are respectively set with first O type sealing ring assembly and second O type sealing ring assembly, first O type sealing ring assembly is attached with the hole wall of first counterbore, second O type sealing ring assembly is attached with the hole wall of second counterbore;Positioning structure, it is set on cylinder cover, oil inlet connecting block is attached with positioning structure, positioning structure and sealing pipe cooperate and position oil inlet connecting block. Thus, the part of oil inlet connecting block and hydraulic cylinder cylinder cover connection can avoid oil leakage when hydraulic cylinder operates.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic cylinder oil inlet accessories, and specifically relates to a hydraulic cylinder oil inlet connecting block anti-leakage structure. Background Technology

[0002] A hydraulic cylinder has a rod chamber and a rodless chamber. The piston rod is located in the rod chamber, while the rodless and rod chambers are located on opposite sides of the piston. During operation, the pressure in the rodless chamber is much greater than the pressure in the rod chamber. The cylinder head has two oil holes: one a low-pressure oil hole connected to the rod chamber, and the other a high-pressure oil hole connected to the rodless chamber. To facilitate connecting the oil supply lines, an oil inlet connector is sometimes bolted to the cylinder head. This connector contains a first oil passage connected to the low-pressure oil hole and a second oil passage connected to the high-pressure oil hole.

[0003] To ensure a seal, such as Figure 1 As shown, planar seals are installed at the connection points of the first oil passage and the low-pressure oil port, and the second oil passage and the high-pressure oil port. During hydraulic cylinder operation, the oil pressure in the rod chamber is low, so the planar seal between the first oil passage and the low-pressure oil port remains intact, providing a good seal. However, the oil pressure in the rodless chamber is high. This high pressure acts not only on the piston but also on the side wall of the second oil passage connected to the rodless chamber, exerting a significant thrust on the inlet connector. This thrust pushes the inlet connector away from the cylinder head. If the bolts connecting the inlet connector to the hydraulic cylinder head loosen, the planar seal between the second oil passage and the high-pressure oil port will be damaged, resulting in oil leakage. Utility Model Content

[0004] This utility model provides an oil leakage prevention structure for the hydraulic cylinder oil inlet connection block, which is used to prevent oil leakage at the connection position between the oil inlet connection block and the hydraulic cylinder head.

[0005] This utility model is achieved through the following technical solution: a hydraulic cylinder oil inlet connecting block anti-leakage structure, wherein the hydraulic cylinder has a rod chamber and a rodless chamber, the cylinder head of the hydraulic cylinder is provided with a low-pressure oil hole communicating with the rod chamber and a high-pressure oil hole communicating with the rodless chamber, the oil inlet connecting block is installed on the cylinder head of the hydraulic cylinder, and the oil inlet connecting block is provided with a first oil passage communicating with the low-pressure oil hole and a second oil passage communicating with the high-pressure oil hole, comprising:

[0006] A planar seal is installed at the position where the first oil passage connects to the low-pressure oil hole;

[0007] A sealing tube has a first section and a second section. A first countersunk hole is provided at the opening of the second oil passage, and a second countersunk hole is provided at the opening of the high-pressure oil hole. The first section and the second section are respectively inserted into the first countersunk hole and the second countersunk hole, and the sealing tube connects the second oil passage and the high-pressure oil hole. A first O-ring seal assembly is sleeved on the first section, and the first O-ring seal assembly fits against the hole wall of the first countersunk hole.

[0008] A second O-ring assembly is fitted in the second section, and the second O-ring assembly fits against the wall of the second countersunk hole;

[0009] A positioning structure is also provided on the cylinder head, and the outer wall of the oil inlet connecting block is attached to the positioning structure. The positioning structure is used to cooperate with the sealing pipe to position the oil inlet connecting block.

[0010] Furthermore, in order to better realize this utility model, the sealing tube is a metal tube.

[0011] Furthermore, in order to better realize this utility model, the metal tube is a structural component made of alloy structural steel.

[0012] Furthermore, in order to better realize this utility model, the positioning structure is a step protruding from the cylinder head.

[0013] Furthermore, in order to better realize this utility model, the oil inlet connecting block is bolted to the cylinder head by ordinary bolts.

[0014] Furthermore, in order to better realize this utility model, the number of ordinary bolts is two, the sealing tube is located between the two ordinary bolts, and the sealing tube and the two ordinary bolts are respectively located at the three vertices of the same isosceles triangle, and the distance between the sealing tube and the two ordinary bolts is the same.

[0015] Furthermore, in order to better realize this utility model, the ordinary bolt and the step are respectively located on both sides of the sealing tube.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] The oil leakage prevention structure for the hydraulic cylinder inlet connection block provided by this utility model includes a planar seal and a sealing tube. The planar seal seals the connection between the low-pressure oil hole of the hydraulic cylinder and the corresponding oil passage (i.e., the first oil passage) on the inlet connection block. The sealing tube has a first section and a second section. A second countersunk hole is provided at the opening of the high-pressure oil hole of the hydraulic cylinder, and a first countersunk hole is provided at the opening of the oil passage (i.e., the second oil passage) corresponding to the high-pressure oil hole on the inlet connection block. The first section and the second section of the sealing tube are respectively inserted into the first countersunk hole and the second countersunk hole. A first O-ring seal assembly is sleeved on the first section and fits against the wall of the first countersunk hole. A second O-ring seal assembly is sleeved on the second section and fits against the wall of the second countersunk hole. Moreover, the sealing tube connects the second oil passage and the high-pressure oil hole. A positioning structure is provided on the cylinder head, and the outer wall of the inlet connection block is in contact with the positioning structure. The positioning structure is used to cooperate with the sealing tube to position the inlet connection block.

[0018] With the above structure, the connection between the low-pressure oil hole and the first oil passage is sealed by a planar seal, and the connection between the high-pressure oil hole and the second oil passage is sealed by a sealing tube, a first O-ring seal assembly, and a second O-ring seal assembly. In this way, there will be no oil leakage at the connection between the low-pressure oil hole and the first oil passage. Moreover, even if the large oil pressure in the rodless chamber of the hydraulic cylinder reacts against the side wall of the second oil passage and pushes the oil inlet connecting block a small distance away from the cylinder head, the sealing tube will still be inserted into the first and second countersunk holes, and the first and second O-ring seal assemblies can still provide a good sealing effect, preventing oil leakage at the connection between the high-pressure oil hole and the second oil passage. In addition, the positioning structure and the sealing tube can position the oil inlet connecting block, preventing it from rotating, thereby preventing oil leakage at the connection between the low-pressure oil hole and the first oil passage. Therefore, with this structure, oil leakage at the connection between the oil inlet connecting block and the cylinder head of the hydraulic cylinder can be avoided during the operation of the hydraulic cylinder. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the installation structure of the oil inlet connection block on the cylinder head of the hydraulic cylinder in the background technology (the low-pressure oil hole and the first oil passage, as well as the high-pressure oil hole and the second oil passage, are sealed by a flat seal).

[0021] Figure 2This is a reference diagram of the anti-leakage structure of the hydraulic cylinder oil inlet connection block provided in this utility model embodiment (the low-pressure oil hole and the first oil passage are sealed by a planar seal, and the high-pressure oil hole and the second oil passage are sealed by a sealing pipe).

[0022] Figure 3 This is a schematic diagram of the structure of the sealing tube in this embodiment of the present invention, in which a first O-ring sealing ring assembly and a second O-ring sealing ring assembly are installed;

[0023] Figure 4 This is a diagram showing the distribution of ordinary bolts, sealing tubes, and steps in an embodiment of this utility model.

[0024] In the picture:

[0025] 10-Hydraulic cylinder, 11-Rod chamber, 12-Rodless chamber, 13-Cylinder head, 14-Low-pressure oil hole, 15-High-pressure oil hole, 20-Oil inlet connecting block, 21-First oil passage, 22-Second oil passage, 30-Flat seal, 40-Sealing tube, 50-First O-ring seal assembly, 60-Second O-ring seal assembly, 70-Step, 80-Ordinary bolt. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Example:

[0028] like Figures 2 to 4 As shown, the oil leakage prevention structure of the hydraulic cylinder inlet connection block provided in this embodiment includes a flat seal 30 and a sealing pipe 40. Similar to the prior art, the hydraulic cylinder 10 has a rod chamber 11 and a rodless chamber 12. The cylinder head 13 of the hydraulic cylinder 10 is provided with a low-pressure oil hole 14 communicating with the rod chamber 11 and a high-pressure oil hole 15 communicating with the rodless chamber 12. The oil inlet connection block 20 is installed on the cylinder head 13 of the hydraulic cylinder 10, and the oil inlet connection block 20 is provided with a first oil passage 21 communicating with the low-pressure oil hole 14 and a second oil passage 22 communicating with the high-pressure oil hole 15.

[0029] Unlike existing technologies, the aforementioned planar seal 30 is installed at the connection between the first oil passage 21 and the low-pressure oil port 14. Optionally, the planar seal 30 can be a planar sealing ring, a metal gasket, a high-elasticity end face seal, etc. The aforementioned sealing tube 40 has a first section and a second section. A first countersunk hole is provided at the opening of the second oil passage 22, and a second countersunk hole is provided at the opening of the high-pressure oil port 15. The first section and the second section are respectively inserted into the first countersunk hole and the second countersunk hole. The first section and the first countersunk hole are clearance-fitted, and the second section and the second countersunk hole are also clearance-fitted. A first O-ring seal assembly 50 is sleeved on the first section, and the first O-ring seal assembly 50 fits against the wall of the first countersunk hole. A second O-ring seal assembly 60 is sleeved on the second section, and the second O-ring seal assembly 60 fits against the wall of the second countersunk hole. The aforementioned sealing tube 40 connects the second oil passage 22 and the high-pressure oil port 15.

[0030] A positioning structure is provided on the cylinder head 13, and the outer wall of the oil inlet connecting block 20 is in contact with the positioning structure. The positioning structure is used to cooperate with the sealing pipe 40 to position the oil inlet connecting block 20. Specifically, the positioning structure is a step 70 protruding on the cylinder head 13, and the step 70 is in close contact with one side of the outer wall of the oil inlet connecting block 20.

[0031] In this way, the contact point between the sleeve and the oil inlet connector 20 can be considered as the base of an isosceles triangle, and the aforementioned sealing tube 40 can be considered as the vertex of this isosceles triangle, thus forming an isosceles triangle. This allows the oil inlet connector 20 to be positioned on the cylinder head 13 of the hydraulic cylinder 10, preventing the oil inlet connector 20 from deflecting during the operation of the hydraulic cylinder 10. That is, this structure allows the oil inlet connector 20 to be more securely installed on the cylinder head 13 of the hydraulic cylinder 10. Therefore, the oil inlet connector 20 cannot rotate when installed on the cylinder head 13 of the hydraulic cylinder 10, thus better preventing oil leakage at the contact point between the oil inlet connector 20 and the cylinder head 13.

[0032] With the above structure, the connection between the low-pressure oil hole 14 and the first oil passage 21 is sealed by the flat seal 30, and the connection between the high-pressure oil hole 15 and the second oil passage 22 is sealed by the cooperation of the sealing tube 40, the first O-ring seal assembly 50, and the second O-ring seal assembly 60. In this way, there will be no oil leakage at the connection between the low-pressure oil hole 14 and the first oil passage 21. Moreover, even if the large oil pressure in the rodless chamber 12 of the hydraulic cylinder 10 reacts against the side wall of the second oil passage 22 and pushes the oil inlet connecting block 20 a small distance away from the cylinder head 13 of the hydraulic cylinder 10, the sealing tube 40 will still be inserted. In the first and second countersunk holes, and the first O-ring seal assembly 50 and the second O-ring seal assembly 60 can still provide a good sealing effect, preventing oil leakage at the connection between the high-pressure oil hole 15 and the second oil passage 22. In addition, the positioning structure and the sealing tube 40 can position the oil inlet connecting block 20, preventing the oil inlet connecting block 20 from rotating, thereby preventing oil leakage at the connection between the low-pressure oil hole 14 and the first oil passage 21. Therefore, with the help of this structure, oil leakage can be prevented at the connection between the oil inlet connecting block 20 and the cylinder head 13 of the hydraulic cylinder 10 during the operation of the hydraulic cylinder 10.

[0033] It is worth noting that the first O-ring assembly 50 and the second O-ring assembly 60 in this embodiment are both existing sealing assemblies, and both the first O-ring assembly 50 and the second O-ring assembly 60 include an O-ring and a corresponding retaining ring.

[0034] Optionally, the sealing tube 40 described above is a metal tube, and the metal tube is a thick-walled tube, and the metal tube is a structural component made of alloy structural steel. Alternatively, the sealing tube 40 described above can also be a tubular structure made of other materials, such as stainless steel.

[0035] Optionally, since the oil inlet connection block 20 is positioned on the cylinder head 13 through the cooperation of the positioning structure and the sealing tube 40, the oil inlet connection block 20 can be bolted to the cylinder head 13 with ordinary bolts 80, without the need for specially customized reamed hole bolts. Therefore, the bolts for installing the oil inlet connection block 20 on the cylinder head 13 are easier to obtain, and ordinary bolts 80 are more interchangeable and have higher versatility, which facilitates maintenance.

[0036] Optionally, the number of ordinary bolts 80 used to install the oil inlet connecting block 20 on the cylinder head 13 is two, the sealing tube 40 is located between the two ordinary bolts 80, and the sealing tube 40 and the two ordinary bolts 80 are respectively located at the three vertices of the same isosceles triangle. The distance between the sealing tube 40 and the two ordinary bolts 80 is the same, and the ordinary bolts 80 and the step 70 are respectively located on both sides of the sealing tube 40.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A leak-proof structure for a hydraulic cylinder inlet connector, wherein the hydraulic cylinder (10) has a rod chamber (11) and a rodless chamber (12), and the cylinder head (13) of the hydraulic cylinder (10) is provided with a low-pressure oil hole (14) communicating with the rod chamber (11) and a high-pressure oil hole (15) communicating with the rodless chamber (12), the inlet connector (20) is installed on the cylinder head (13) of the hydraulic cylinder (10), and the inlet connector (20) is provided with a first oil passage (21) communicating with the low-pressure oil hole (14) and a second oil passage (22) communicating with the high-pressure oil hole (15), characterized in that, include: A flat seal (30) is installed at the position where the first oil passage (21) connects to the low-pressure oil hole (14); A sealing tube (40) has a first section and a second section. A first countersunk hole is provided at the opening of the second oil passage (22), and a second countersunk hole is provided at the opening of the high-pressure oil hole (15). The first section and the second section are respectively inserted into the first countersunk hole and the second countersunk hole. The sealing tube (40) connects the second oil passage (22) and the high-pressure oil hole (15). A first O-ring seal assembly (50) is sleeved on the first section. The first O-ring seal assembly (50) fits against the hole wall of the first countersunk hole. A second O-ring seal assembly (60) is sleeved on the second section. The second O-ring seal assembly (60) fits against the hole wall of the second countersunk hole. A positioning structure is provided on the cylinder head (13), and the outer wall of the oil inlet connecting block (20) is in contact with the positioning structure. The positioning structure is used to cooperate with the sealing pipe (40) to position the oil inlet connecting block (20).

2. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to claim 1, characterized in that: The sealing tube (40) is a metal tube.

3. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to claim 2, characterized in that: The metal tube is a structural component made of alloy structural steel.

4. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to any one of claims 1-3, characterized in that: The positioning structure is a step (70) protruding from the cylinder head (13).

5. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to claim 4, characterized in that: The oil inlet connector (20) is bolted to the cylinder head (13) by ordinary bolts (80).

6. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to claim 5, characterized in that: There are two ordinary bolts (80), and the sealing tube (40) is located between the two ordinary bolts (80). The sealing tube (40) and the two ordinary bolts (80) are located at the three vertices of the same isosceles triangle, and the distance between the sealing tube (40) and the two ordinary bolts (80) is the same.

7. The oil leakage prevention structure for the hydraulic cylinder oil inlet connection block according to claim 6, characterized in that: The ordinary bolt (80) and the step (70) are located on both sides of the sealing tube (40).

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