High-pressure sealing and pressure adjusting structure of hydraulic cutter handle

Abstract

The utility model relates to a high pressure sealing and pressure adjusting structure of a hydraulic knife handle, which comprises a knife handle base body, a piston rod, an O-shaped sealing ring, a thread bushing and a screw, the knife handle base body is provided with a piston cavity, a sealing cavity and a thread cavity, and the piston cavity, the sealing cavity and the thread cavity are sequentially distributed in a stepped hole structure; the threaded sleeve is fixed in the threaded cavity; one end of the piston rod is arranged in the piston cavity, and the other end of the piston rod penetrates through a center hole of the threaded sleeve and is supported on the screw. The screw is arranged in the threaded sleeve, is spirally matched with the threaded sleeve and can push the piston rod to move in the piston cavity; the piston rod, the threaded sleeve and the inner wall of the sealing cavity form a closed annular cavity, and the O-shaped sealing ring is arranged in the annular cavity. The sealing element is simple in structure, convenient to machine and manufacture, low in cost and capable of effectively guaranteeing the performance and the service life of the sealing element in the high-pressure environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic tool handles, and particularly relates to a high-pressure sealing and pressure regulating structure of a hydraulic tool handle. Background Art

[0002] The hydraulic toolholder is a toolholder that works on the principle of static pressure expansion. It has the characteristics of large clamping force and high precision, which can effectively improve the processing quality and extend the service life of the tool. The existing hydraulic toolholder high-pressure sealing and pressure adjustment structure usually directly processes the piston hole and threaded hole on the toolholder base, and then installs the customized seal into the piston hole, and the piston rod pushes the seal to compress the oil. In order to ensure the sealing effect and the service life of the seal, the dimensional accuracy and surface roughness of the piston hole and piston rod are required to be high. However, due to the limitation of product volume, the size of the hydraulic toolholder's oil channel, piston hole and other features is small, which is difficult to process and it is difficult to obtain high processing accuracy. In addition, since the seals of this structure are mostly customized, the cost is high and it is not easy to replace. In order to achieve the versatility of the seal and reduce the cost of use, there is also a solution of processing an installation groove that can accommodate an O-ring in the piston hole. However, due to the small diameter of the piston hole, the internal groove is very difficult to process, and the O-ring alone has a poor sealing effect in a high-pressure environment and a short service life. Summary of the invention

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a high-pressure seal and pressure regulating structure for a hydraulic tool handle which has a simple structure, is easy to manufacture and has a low cost, and effectively ensures the performance and service life of the seal under high-pressure environments.

[0004] In order to solve the above technical problems, the utility model is realized through the following technical solutions: a high-pressure sealing and pressure regulating structure of a hydraulic tool handle, comprising a tool handle base, a piston rod, an O-ring, a threaded sleeve and a screw, the tool handle base is provided with a piston chamber, a sealing chamber and a threaded chamber, and the piston chamber, the sealing chamber and the threaded chamber are distributed in a stepped hole structure in sequence; the threaded sleeve is fixed in the threaded chamber; one end of the piston rod is arranged in the piston chamber, and the other end passes through the center hole of the threaded sleeve and is supported on the screw; the screw is arranged in the threaded sleeve and spirally cooperates with the threaded sleeve to push the piston rod to move in the piston chamber; the piston rod and the threaded sleeve form a closed annular cavity with the inner wall of the sealing cavity, and the O-ring is arranged in the annular cavity.

[0005] In the above-mentioned high-pressure sealing and pressure regulating structure of the hydraulic tool handle, a retaining ring is also arranged in the annular cavity, and the retaining ring is located between the O-ring and the threaded sleeve.

[0006] In the above-mentioned high-pressure sealing and pressure regulating structure of the hydraulic tool handle, the threaded sleeve and the threaded cavity are connected by vacuum welding.

[0007] In the above-mentioned high-pressure sealing and pressure regulating structure of the hydraulic tool handle, a brazing material groove is provided on the threaded sleeve, and the brazing material groove is filled with brazing material, and the threaded sleeve and the threaded cavity are fixed together by vacuum welding through the brazing material.

[0008] In the above-mentioned high-pressure sealing and pressure regulating structure of the hydraulic tool holder, the movement of the piston rod in the piston chamber can compress the oil in the piston chamber, thereby clamping the tool by increasing the pressure.

[0009] The high-pressure sealing and pressure regulating structure of the hydraulic tool handle can adjust the tool handle pressure by controlling the number of spiral fit turns between the screw and the threaded sleeve.

[0010] In the above-mentioned high-pressure sealing and pressure regulating structure of the hydraulic tool handle, the diameter of the piston cavity is larger than the diameter of the piston rod.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a stepped hole and a threaded sleeve to form a sealing ring installation structure, which greatly reduces the processing difficulty while obtaining higher processing accuracy; and the sealing ring can adopt a standard O-ring, without special customization, reducing production costs and maintenance costs. The use of a retaining ring to protect the O-ring not only increases the use pressure of the O-ring, but also prevents the extrusion of the O-ring under high pressure, thereby increasing the service life of the O-ring, and further ensuring that the hydraulic tool handle maintains a good clamping force for a long time. The utility model has no requirements for the matching of the piston rod and the piston cavity. The diameter of the piston cavity can be larger than the diameter of the piston rod. The piston rod will not contact the piston cavity during movement, reducing the position accuracy requirements between the piston cavity and the piston rod. There is no concentricity requirement between the threaded sleeve through hole and the piston cavity. At the same time, it also reduces the accuracy and surface roughness requirements of the piston cavity itself, further reducing the processing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model.

[0013] Figure 2 It is a schematic diagram of the structure of the base part of the handle provided by the embodiment of the utility model.

[0014] Figure 3 It is a schematic diagram of the structure of a threaded sleeve provided in an embodiment of the utility model. Implementation

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0016] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0017] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0018] Combination Figure 1 and Figure 2 As shown, a high-pressure sealing and pressure regulating structure of a hydraulic tool handle provided by an embodiment of the utility model comprises a tool handle base 1, a piston rod 2, an O-ring 3, a retaining ring 4, a threaded sleeve 5 and a screw 6. A piston chamber 11, a sealing chamber 12 and a threaded chamber 13 are processed on the tool handle base 1, and the piston chamber 11, the sealing chamber 12 and the threaded chamber 13 are distributed in a stepped hole structure in sequence. The piston chamber 11 is communicated with the oil pressure pipe, and a threaded sleeve 5 is fixed in the threaded chamber 13, and an internal thread is arranged on the threaded sleeve 5, and the screw 6 is spirally matched with the threaded sleeve 5. The upper end of the screw 6 is provided with a piston rod 2, and the piston rod 2 passes through the threaded sleeve 5 and the sealing chamber 12 in sequence to enter the piston chamber 11, and the piston rod 2 and the upper top surface of the threaded sleeve 5 and the inner side wall and the inner top surface of the sealing chamber form a closed annular cavity. The O-ring 3 and the retaining ring 4 are placed in the annular cavity and sleeved on the piston rod 2. The O-ring 3 forms a seal in the piston cavity 11. The rotating screw 6 can push the piston rod 2 to move in the piston cavity 11, thereby compressing the oil in the piston cavity 11, and then the tool holder clamps the tool to perform cutting operations. The retaining ring 4 is located between the O-ring 3 and the threaded sleeve 5, and plays a role in protecting the O-ring 3. It can not only increase the use pressure of the O-ring 3, but also prevent the O-ring 3 from being squeezed out under high pressure, thereby increasing the service life of the O-ring and allowing the hydraulic tool holder to maintain a good clamping force for a long time.

[0019] like Figure 3 As shown, the threaded sleeve 5 is provided with a central through hole 51 and a solder groove 52. The central through hole 51 is a movable channel for the piston rod 2, and the solder groove 52 is used to fill solder so as to fix the threaded sleeve 5 in the threaded cavity 13 by vacuum welding. Before the threaded sleeve 5 is installed in the threaded cavity 13, the solder needs to be filled in the solder groove 52.

[0020] The installation process of the utility model is to place the threaded sleeve 5 with solder in the threaded cavity 13, so that its upper top surface contacts the horizontal stepped surface of the threaded cavity 13, and then perform vacuum brazing. After the welding is completed, the upper top surface of the threaded sleeve 5 and the horizontal stepped surface of the threaded cavity 13 are tightly welded together. The O-type sealing ring 3 and the retaining ring 4 are sequentially installed in the sealing cavity 12, and then the piston rod 2 is inserted into the central through hole 51, and the O-type sealing ring 3 and the retaining ring 4 are sleeved on the circumferential surface of the piston rod 2 to form a good sealing effect. Finally, the screw 6 is screwed into the threaded hole of the threaded sleeve 5 to push the piston rod 2 to compress the oil, so that the tool handle clamps the tool. According to the different number of turns of the screw 6, the volume of the oil compressed is also different, and different values ​​of pressure can be generated in the piston cavity 11, thereby realizing the adjustment of the tool handle pressure.

[0021] The utility model provides a sealing chamber 12, and an O-ring is provided outside the piston chamber 11. There is no requirement for the fit between the piston chamber 11 and the piston rod 2. The diameter of the piston chamber 11 can be larger than the diameter of the piston rod 2. The piston rod 2 will not contact the piston chamber 11 during movement, thereby reducing the position accuracy requirement between the piston chamber 11 and the piston rod 2. Therefore, there is no concentricity requirement for the central through hole 51 of the threaded sleeve 5 and the piston chamber 11. At the same time, the accuracy and surface roughness requirements of the piston chamber 11 itself are also reduced, thereby reducing the processing difficulty.

[0022] Although the utility model is described in detail above, the utility model is not limited thereto, and those skilled in the art can make various modifications according to the principle of the utility model. Therefore, all modifications made according to the principle of the utility model should be understood to fall within the protection scope of the utility model.

Claims

1. A high pressure seal and pressure regulating structure for a hydraulic tool handle. It is characterized in that It includes a tool handle base, a piston rod, an O-ring, a threaded sleeve and a screw. The tool handle base is provided with a piston chamber, a sealing chamber and a threaded chamber, which are distributed in a stepped hole structure in sequence; the threaded sleeve is fixed in the threaded chamber; one end of the piston rod is arranged in the piston chamber, and the other end passes through the central hole of the threaded sleeve and is supported on the screw; the screw is arranged in the threaded sleeve and spirally cooperates with the threaded sleeve to push the piston rod to move in the piston chamber; the piston rod and the threaded sleeve form a closed annular cavity with the inner wall of the sealing chamber, and the O-ring is arranged in the annular cavity.

2. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 1, It is characterized in that A retaining ring is also arranged in the annular cavity, and the retaining ring is located between the O-type sealing ring and the threaded sleeve.

3. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 1 or 2, It is characterized in that The threaded sleeve and the threaded cavity are connected by vacuum welding.

4. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 3, It is characterized in that The threaded sleeve is provided with a solder groove filled with solder, and the threaded sleeve and the threaded cavity are fixed together by vacuum welding through the solder.

5. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 4, It is characterized in that The movement of the piston rod in the piston chamber can compress the oil in the piston chamber and clamp the tool by increasing the pressure.

6. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 5, It is characterized in that The pressure on the tool handle can be adjusted by controlling the number of spiral matching turns between the screw and the threaded sleeve.

7. A high pressure sealing and pressure regulating structure for a hydraulic tool handle according to claim 6, It is characterized in that The diameter of the piston cavity is greater than the diameter of the piston rod.

Images