Piston locking structure of oversized and overlong hydraulic cylinder

Abstract

The piston locking structure comprises a piston rod and a piston which are arranged in a split mode, the piston is arranged on the piston rod in a sleeved mode, the piston rod is provided with a key groove, a clamping key is arranged in the key groove, the clamping key makes contact with the piston in the axial direction to abut against the piston, a plurality of limiting pieces are installed on the end face of the piston, and the limiting pieces are arranged on the piston rod. The limiting piece is located above the clamping key, and the limiting piece tightly presses the clamping key to limit the clamping key to be separated from the key groove. By means of the mode, the piston locking structure of the ultra-large and ultra-long hydraulic cylinder achieves locking of the piston through the key groove structure and the limiting piece, prevents the piston from loosening on the piston rod, and is simple in structure and convenient and fast to install.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a piston locking structure of an extra-large and extra-long hydraulic cylinder. Background Art

[0002] The locking of the cylinder piston has always been an issue that must be considered in the design of the cylinder. If the locking is not done well, the piston will be at risk of loosening and failure. At present, the commonly used locking methods of the piston are: Saddle screw locking: by placing a screw between the piston and the piston rod thread, relying on the screw's own shear resistance, hindering the rotation of the piston to achieve the locking of the piston. Pin locking: inserting a locking pin longitudinally between the piston and the piston rod, and then limiting the position of the screw to achieve the locking limit of the piston. In principle, the piston is also locked by its own shear resistance to hinder the rotation of the piston.

[0003] Saddle screw locking and through pin locking can be used for small and medium-sized cylinder locking designs, but due to the size limitations of the locking parts themselves, they cannot withstand large shear forces. If used on large cylinders, more or larger locking parts are required. Considering that the installation of locking parts requires drilling, the actual operation is difficult. Summary of the invention

[0004] The main technical problem solved by the utility model is to provide a piston locking structure of an extra-large and extra-long hydraulic cylinder, which locks the piston through a keyway structure and a limiter to prevent the piston from loosening on the piston rod, has a simple structure and is easy to install.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a piston locking structure of an extra-large and extra-long hydraulic cylinder, including a piston rod and a piston which are separately arranged, the piston sleeve being arranged on the piston rod, the piston rod being provided with a keyway, the keyway being provided with a key, the key being in axial contact with the piston to resist the piston, a plurality of limit members being installed on the end face of the piston, the limit members being located above the key, and the limit members pressing the key to limit the key from being separated from the keyway.

[0006] In a preferred embodiment of the present invention, the limiting member is a limiting screw, and the limiting screw is screwed into the end face of the piston in the axial direction.

[0007] In a preferred embodiment of the present invention, the limit screw is arranged in parallel with the clamping key, and the screw head of the limit screw contacts the clamping key to compress the clamping key.

[0008] In a preferred embodiment of the utility model, the keyway of the piston rod is opened on its circumference, a limiting groove corresponding to the key is opened on the piston, the upper end of the key is located in the limiting groove and contacts the piston, and the limiting piece is screwed into the piston from the limiting groove.

[0009] In a preferred embodiment of the present invention, the key grooves are evenly spaced and distributed on the piston rod, and the limit grooves are evenly spaced and distributed on the piston.

[0010] In a preferred embodiment of the present utility model, the piston rod has a step structure, and the step hole of the piston cooperates with the step structure.

[0011] The beneficial effect of the utility model is that the piston locking structure of the super-large and super-long hydraulic cylinder of the utility model supports the piston in the axial direction through the clamping key to prevent the piston from axially loosening relative to the piston rod, and at the same time the clamping key realizes locking by relying on its own shear resistance.

[0012] The utility model discloses a piston locking structure of an extra-large and extra-long hydraulic cylinder. A limit screw is screwed into the piston. The limit screw presses the key into the key slot from the radial direction to prevent the key from falling out of the key slot, thereby ensuring the locking effect of the key on the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0014] Figure 1 It is a structural schematic diagram of a preferred embodiment of the piston locking structure of the super-large and super-long hydraulic cylinder of the utility model;

[0015] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0016] The markings of the components in the accompanying drawings are as follows: 1. piston rod, 11. keyway, 2. piston, 21. limit groove, 3. key, 4. limit piece. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0018] See also Figure 1 and Figure 2 A piston locking structure for an extra-large and extra-long hydraulic cylinder includes a piston rod 1 and a piston 2 which are separately arranged, and the piston 2 is sleeved on the piston rod 1. The piston rod 1 has a step structure, and the step hole of the piston 2 cooperates with the step structure. When installing, the piston 2 is first sleeved on the piston rod 1, and then the subsequent assembly is performed.

[0019] The piston rod 1 is provided with a keyway 11, and a key 3 is provided in the keyway 11. The key 3 contacts the piston 2 in the axial direction to resist the piston 2. The keyway 11 of the piston rod 1 is provided in its circumference, and a limiting groove 21 corresponding to the key 3 is provided on the piston 2. The keyway 11 is evenly spaced on the piston rod 1, and the limiting grooves 21 are evenly spaced on the piston 2. The upper end of the key 3 is located in the limiting groove 21 and contacts the piston 2. The key is first inserted into the limiting groove 21 laterally, and then inserted into the keyway 11 radially. A part of the key 3 remains in the limiting groove 21 and is tightly attached to the end face of the piston 2, clamping the piston 2 in the axial direction. The key 3 hinders the axial movement of the piston 2 and achieves locking by its own shear resistance. The keyway 11 and the limiting groove 21 are processed in the machining stage and can be directly installed during assembly.

[0020] Preferably, the number of the key slot 11, the limiting slot 21 and the latch key 3 are all 4. Of course, other numbers can also be selected according to actual needs.

[0021] The end face of the piston 2 is provided with a plurality of limit members 4, which are screwed into the piston 2 from the limit groove 21. The limit member 4 is located above the key 3, and the limit member 4 presses the key 3 to limit the key 3 from being separated from the key groove 11. The limit member 4 is a limit screw, which is screwed into the end face of the piston 2 in the axial direction. The limit screw is arranged in parallel with the key 3, and the screw head of the limit screw contacts the key 3 to press the key 3. The piston 2 is screwed with a screw, and the screw head is radially pressed against the key 3 to prevent the key 3 from being separated from the piston rod 1.

[0022] The piston 2 is clamped and locked by a combined locking method of a split key and a limit screw. The double locking structure of the limit screw locking the key ensures that the piston 2 and the piston rod 1 can be stably connected, and the installation is simple.

[0023] Different from the prior art, the piston locking structure of the super-large and super-long hydraulic cylinder of the utility model locks the piston through a keyway structure and a limiter to prevent the piston from loosening on the piston rod, has a simple structure, and is easy to install.

[0024] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A piston locking structure for an extra-large and extra-long hydraulic cylinder, comprising a piston rod (1) and a piston which are separately arranged, characterized in that: The piston (2) is sleeved on a piston rod (1), the piston rod (1) is provided with a keyway (11), a key (3) is provided in the keyway (11), the key (3) is in contact with the piston (2) in the axial direction to resist the piston (2), a plurality of limit members (4) are installed on the end surface of the piston (2), the limit members (4) are located above the key (3), and the limit members (4) press the key (3) to prevent the key (3) from leaving the keyway (11).

2. The piston locking structure of the super-large and super-long hydraulic cylinder according to claim 1 is characterized in that: The limiting member (4) is a limiting screw, and the limiting screw is screwed into the end surface of the piston (2) in the axial direction.

3. The piston locking structure of the super-large and super-long hydraulic cylinder according to claim 2 is characterized in that: The limit screw is arranged in parallel with the clamping key (3), and the screw head of the limit screw contacts the clamping key (3) to press the clamping key (3).

4. The piston locking structure of the super-large and super-long hydraulic cylinder according to any one of claims 1 to 3, characterized in that: The keyway (11) of the piston rod (1) is provided on its circumference, the piston (2) is provided with a limiting groove (21) corresponding to the clamping key (3), the upper end of the clamping key (3) is located in the limiting groove (21) and contacts the piston (2), and the limiting member (4) is screwed into the piston from the limiting groove (21).

5. The piston locking structure of the super-large and super-long hydraulic cylinder according to claim 4 is characterized in that: The key grooves (11) are evenly spaced and distributed on the piston rod (1), and the limit grooves (21) are evenly spaced and distributed on the piston (2).

6. The piston locking structure of the super-large and super-long hydraulic cylinder according to claim 1 is characterized in that: The piston rod (1) has a step structure, and the step hole of the piston (2) cooperates with the step structure.

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