Hydraulic tool and piston assembly thereof

Abstract

The utility model belongs to the technical field of hydraulic tools, and particularly relates to a hydraulic tool and a piston assembly thereof. The piston assembly includes: a piston rod; the spring retainer ring is fixed at one end of the piston rod; the periphery of the piston rod is sleeved with the piston spring, and the end of the piston spring abuts against the spring check ring; the fixing piece is used for fixing the spring collar on the piston rod; the connecting piece is installed in the piston rod and used for being matched with the fixing piece; wherein the fixing piece is provided with a fixing part combined with the spring check ring, and a connecting rod connected with the connecting piece. Due to the fact that the connecting piece is installed in the piston rod, and the spring washer is in threaded connection with the connecting piece through the fixing piece, only drilling is needed in the piston rod, deep thread tapping does not need to be conducted on a hole in the piston rod, and machining difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic tools, and in particular relates to a hydraulic tool and a piston assembly thereof. Background Art

[0002] Hydraulic tools are tools that are driven manually or electrically by users and use internal oil transmission mechanisms to drive working parts to perform operations. They are widely used in construction operations such as pipelines, electricity, construction, and decoration. Existing hydraulic tools are usually composed of a body and working parts. The working parts are classified into various types according to actual work needs, such as crimping heads, shearing heads, and expansion heads.

[0003] In the existing hydraulic tools, such as a pipe crimping tool disclosed in CN213436669U, the piston driving part is generally mainly composed of a piston rod, a piston, a piston spring, a spring retaining ring and other components. In most existing tools, such as Figure 1 As shown, the piston spring (1) is arranged in a compressed or semi-compressed state in the piston chamber (2), and one end is arranged against the inner wall of the piston chamber (2), and the other end needs to be arranged against the spring retaining ring (4) fixed at the tail of the piston rod (3). Figure 2 As shown, since the piston spring (1) is in a natural state at the beginning, the spring retaining ring (4) and the screw (5) are both far away from the piston rod (3), it is necessary to first compress the piston spring with a special tool, allow the screw (5) to at least partially enter the threaded hole in the piston rod, and then use a wrench to rotate the screw (5) to screw the spring retaining ring (4) into the threaded hole (6) corresponding to the tail of the piston rod (3), which is cumbersome to install. At the same time, when repairing and disassembling the spring retaining ring, if you are not careful, the piston spring will directly push the spring retaining ring out under the elastic force, which is easy to cause harm to people. In addition, since the spring retaining ring is directly fixed to the piston rod by a screw, when processing the piston rod, it is necessary to first drill a hole in the piston rod, and then tap the thread in the deep area of ​​the hole (i.e., the part connected to the end of the screw). The procedure is cumbersome and difficult, and not convenient enough. Summary of the invention

[0004] The utility model provides a hydraulic tool and a piston assembly thereof which are simple in structure and convenient in processing and do not require thread tapping in a deep area inside a piston rod.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model proposes a piston assembly for a hydraulic tool, which has the following characteristics: a piston rod; a spring retaining ring installed at one end of the piston rod; a piston spring sleeved on the outer circumference of the piston rod, and the end of the piston spring abuts against the spring retaining ring; a fixing member used to install the spring retaining ring on the piston rod; and a connecting member installed in the piston rod and used to cooperate with the fixing member; wherein the fixing member comprises: a fixing part combined with the spring retaining ring, and a connecting rod connected to the connecting member.

[0007] The piston assembly for a hydraulic tool provided in the utility model may also have such a feature that the piston spring has a natural state, and when the piston spring is in the natural state, one end of the connecting rod away from the fixing portion extends into the connecting piece.

[0008] The piston assembly for hydraulic tools proposed in the utility model may also have such a feature that a mounting hole with one end closed and the other end open is provided in the piston rod, and an annular groove for fixing the connecting piece is provided at the open end of the mounting hole, and the connecting rod is rotated so that the connecting rod passes through the connecting piece and extends into the mounting hole.

[0009] The piston assembly for hydraulic tools proposed in the utility model may also have such a feature that a threaded hole matching with the connecting rod is opened in the middle of the connecting piece, and the diameter of the mounting hole is larger than the diameter of the threaded hole.

[0010] In the piston assembly for hydraulic tools proposed in the utility model, it can also have such a feature that the spring retaining ring has a main body portion abutting against the piston spring, the main body portion protrudes toward the direction of the piston rod to form a fixed convex portion, and one end of the piston rod close to the main body portion is recessed inward to form a fixed groove matching the fixed convex portion, and the fixed groove is adjacent to the annular groove.

[0011] The hydraulic tool piston assembly proposed in the utility model may also have the following features: the fixing part is a screw, the connecting rod is a threaded rod, the connecting part is a nut with threads both inside and outside, and a countersunk hole combined with the fixing part is opened in the middle of the spring retaining ring.

[0012] The hydraulic tool piston assembly provided in the utility model may also have the following features: it also includes a piston sleeved on the outer periphery of the spring retaining ring, and a sealing ring is provided between the outer periphery of the piston and the inner wall of the piston chamber.

[0013] The utility model also proposes a hydraulic tool having the following characteristics: a body having a piston cavity, a working part installed on the body, and a piston assembly installed in the piston cavity for driving the working part to work, wherein the piston assembly is the piston assembly for the hydraulic tool as described above.

[0014] The hydraulic tool provided by the utility model may also have such a feature that one end of the piston rod is movably arranged in the piston cavity, and the other end extends out of the piston cavity to cooperate with the working component.

[0015] Function and effect of utility model

[0016] According to the hydraulic tool and piston assembly thereof of the utility model, firstly, since a connecting piece is installed in the piston rod, the spring washer is threadedly connected to the connecting piece through a fixing piece, so that only a hole needs to be drilled in the piston rod, and there is no need to deeply tap the hole in the piston rod, thereby reducing the processing difficulty.

[0017] Secondly, when the piston spring is in the natural state, the end of the connecting rod away from the fixing part can be directly inserted into the threaded hole of the connecting part, so that when installing the spring gasket, the fixing part can be directly screwed into the piston rod. During the screwing process, the piston spring will be gradually compressed, and there is no need to use special tools to compress the piston spring before screwing it in, which greatly simplifies the installation process and reduces the difficulty of installation. At the same time, when the tool needs to be repaired and disassembled later, the piston spring will slowly return to its natural state during the process of screwing out the fixing part along with the spring retaining ring, avoiding instantaneous popping out and accidentally injuring the user, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the position of the spring retaining ring after installation in the prior art.

[0019] Figure 2 It is a cross-sectional schematic diagram of the position of the spring retaining ring before installation in the prior art.

[0020] Figure 3 It is a cross-sectional schematic diagram of the utility model manual hydraulic tool.

[0021] Figure 4 It is a structural cross-sectional view of the position of the spring retaining ring of the utility model after being installed.

[0022] Figure 5 It is a structural cross-sectional view of the spring retaining ring of the utility model before installation.

[0023] Figure 6 The utility model is an exploded schematic diagram of the connection structure of the spring retaining ring and the piston rod.

[0024] Figure numerals: hydraulic tool 100, body 10, piston chamber 11, working part 20, piston assembly 30, piston rod 31, mounting hole 311, annular groove 312, fixing groove 313, spring retaining ring 32, main body 321, fixing protrusion 322, counterbore 323, piston spring 33, fixing part 34, fixing part 341, connecting rod 342, connecting part 35, threaded hole 351, piston 36. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the hydraulic tool and the piston assembly of the present invention are specifically described below in conjunction with the embodiments and drawings.

[0026] <Example>

[0027] Figure 3 It is a cross-sectional schematic diagram of the utility model manual hydraulic tool.

[0028] This embodiment provides a hydraulic tool 100 and a piston assembly thereof, such as Figure 3 As shown, the hydraulic tool 100 includes a body 10, a working part 20, and a piston assembly 30 for driving the working part 20 to work. A piston chamber 11 is provided in the body 10, and the piston assembly 30 is installed in the piston chamber 11. The piston assembly 30 includes a piston rod 31, a spring retaining ring 32, a piston spring 33, a fixing part 34, a connecting part 35, and a piston 36.

[0029] Figure 4 It is a cross-sectional schematic diagram of the position of the spring retaining ring of the utility model after being installed.

[0030] like Figure 3 and Figure 4 As shown, when the piston assembly 30 is installed in the piston cavity 11, one end of the piston rod 31 can be movably arranged in the piston cavity 11, and the other end extends out of the piston cavity 11 to cooperate with the working part 20. Under the push of the hydraulic oil, the piston rod 31 can move in the direction of the working part 20, thereby driving the working part 20 to work. The pushing working principle of the oil is the existing technology and will not be described in detail here. The spring retaining ring 32 is fixedly installed on the end of the piston rod 31 located in the piston cavity 11 through the fixing member 34. The piston spring 33 is sleeved on the outer periphery of the piston rod 31, and one end is against the piston cavity 11, and the other end is against the spring retaining ring 32, and is in a semi-compressed state. The piston rod 31 is provided with a mounting hole 311 with one end closed and the other end open along its axial direction. The open end is one end for installing the spring retaining ring 32, and the open end is provided with an annular groove 312 for fixing the connecting member 35. The connecting member 35 is fixed in the annular groove 312 for cooperating with the fixing member 34. The piston 36 is sleeved on the outer circumference of the spring retaining ring 32 , and a sealing ring is provided between the outer circumference of the piston 36 and the inner wall of the piston chamber 11 .

[0031] In this embodiment, the fixing member 34 is a long strip of screw, having a fixing portion 341 combined with the spring retaining ring 32 and a connecting rod 342 connected to the connecting member 35, and the connecting rod 342 is a threaded rod provided with a threaded section. The connecting member 35 is a nut, and a threaded hole 351 is provided in the middle thereof to match the threaded section on the connecting rod 342, and the threaded section and the threaded hole 351 are screwed together. The aperture of the threaded hole 351 is slightly smaller than the aperture of the mounting hole 311. During installation, the fixing member 34 is connected to the piston rod 31 by rotating the connecting rod 342 with a tool such as a wrench so that the connecting rod 342 passes through the threaded hole 351 on the connecting member 35 and then extends into the mounting hole 311, thereby fixing the spring retaining ring 32 to the piston rod 31.

[0032] Figure 5 It is a structural cross-sectional view of the spring retaining ring of the utility model before installation.

[0033] When the spring retaining ring 32 is installed, the piston spring 33 has a natural state (such as Figure 5 As shown in the figure, when the piston spring 33 is in the natural state, the end of the connecting rod 342 away from the fixing part 341 can be inserted into the connecting piece 35, so that the user can directly use a wrench or other tools to drive and screw the fixing piece 34 in during installation, and the piston spring 33 will be gradually compressed during the screwing process until the paralyzed retaining ring 32 is fixed to the piston rod 31. In this process, there is no need to use additional tools to compress the piston spring 33 first, and the installation is very convenient and trouble-free. Since the connecting rod 342 is threadedly connected to the connecting piece 35, there is no need to tap the thread near the closed end of the mounting hole 311 of the piston rod 31, which simplifies the manufacturing process of the piston rod and reduces the difficulty of manufacturing the piston rod. In addition, when the user disassembles and replaces it, the piston spring 33 will slowly pop out and return to the natural state during the process of screwing out the fixing piece 34 with a wrench, and will not pop out instantly, which greatly improves the safety performance.

[0034] Figure 6 The utility model is an exploded schematic diagram of the connection structure of the spring retaining ring and the piston rod.

[0035] like Figure 5 and Figure 6As shown, the spring retaining ring 32 has a main body 321 that abuts against the piston spring 33, and the main body 321 protrudes toward the direction of the piston rod 31 to form a fixing convex portion 322, and one end of the piston rod 31 close to the main body 321 is recessed inward to form a fixing groove 313 that matches the fixing convex portion 322, and the fixing groove 313 is adjacent to the annular groove 312. A countersunk hole 323 combined with the fixing portion 341 of the fixing member 34 is also opened in the middle of the spring retaining ring 32. When the fixing member 34 is set on the spring retaining ring 32, the fixing portion 341 is located inside the countersunk hole 323, which can prevent the fixing portion 341 from protruding from the end face of the main body 321 of the spring retaining ring 32, making the end face smoother and facilitating the installation of the piston 36.

[0036] In this embodiment, if Figure 6 As shown, the outer periphery of the connecting member 35 is provided with an external thread, and the annular groove 312 in the piston rod 31 is provided with an internal thread, and the connecting member 35 is fixed in the annular groove 312 by threaded connection.

[0037] The above embodiments are only used to illustrate the specific implementation of the present invention, and the present invention is not limited to the description scope of the above embodiments.

Claims

1. A piston assembly for a hydraulic tool, characterized in that: include: Piston rod, A spring retaining ring, mounted on one end of the piston rod; A piston spring, which is sleeved on the outer circumference of the piston rod, and whose end is abutted against the spring retaining ring; A fixing member, used for mounting the spring retaining ring on the piston rod; as well as A connecting piece, installed in the piston rod and used to cooperate with the fixing piece; Wherein, the fixing member has: A fixing part, combined with the spring retaining ring, A connecting rod is connected to the connecting piece.

2. The piston assembly for a hydraulic tool according to claim 1, characterized in that: The piston spring has a natural state. When the piston spring is in the natural state, one end of the connecting rod away from the fixing portion extends into the connecting member.

3. The piston assembly for a hydraulic tool according to claim 2, characterized in that: The piston rod is provided with a mounting hole with one end closed and the other end open, the open end of the mounting hole is provided with an annular groove for fixing the connecting piece, and the connecting rod is rotated so that the connecting rod passes through the connecting piece and then extends into the mounting hole.

4. The piston assembly for a hydraulic tool according to claim 3, characterized in that: A threaded hole matched with the connecting rod is opened in the middle of the connecting piece, and the diameter of the mounting hole is larger than the diameter of the threaded hole.

5. The piston assembly for a hydraulic tool according to claim 3, characterized in that: The spring retaining ring has a main body portion abutting against the piston spring, the main body portion protrudes toward the direction of the piston rod to form a fixing convex portion, and one end of the piston rod close to the main body portion is recessed inward to form a fixing groove matching the fixing convex portion, and the fixing groove is adjacent to the annular groove.

6. The piston assembly for a hydraulic tool according to any one of claims 1 to 5, characterized in that: The fixing member is a screw, the connecting rod is a threaded rod, the connecting member is a nut with threads both inside and outside, and a countersunk hole combined with the fixing part is opened in the middle of the spring retaining ring.

7. The piston assembly for a hydraulic tool according to any one of claims 1 to 5, characterized in that: It also includes a piston, which is sleeved on the outer periphery of the spring retaining ring, and a sealing ring is arranged between the outer periphery of the piston and the inner wall of the piston chamber.

8. A hydraulic tool, characterized in that: include A body having a piston chamber, A working part, mounted on the machine body, A piston assembly is installed in the piston chamber and is used to drive the working component to work. Wherein, the piston assembly is a piston assembly for a hydraulic tool as described in any one of claims 1-7.

9. The hydraulic tool according to claim 8, characterized in that: One end of the piston rod is movably arranged in the piston cavity, and the other end extends out of the piston cavity to cooperate with the working component.

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