A displacement detection device for a variable piston

Abstract

The utility model relates to variable piston relevant technical field discloses a kind of displacement detection equipment of variable piston, including with the waveguide pipe of piston connection and with the installation cylinder of cylinder connection;The waveguide pipe is cylindrical, and one end is fixedly connected with piston, the installation cylinder is equipped with vertical rod, the vertical rod lower end is equipped with the rubber disc of diameter greater than vertical rod, the waveguide pipe sleeve is connected in vertical rod and upper end inner wall is equipped with limit ring, the diameter of limit ring inner wall is less than the diameter of rubber disc, so that waveguide pipe can be detached;The installation cylinder outer wall is equipped with the magnetic ring of cooperation with waveguide pipe. The utility model has the advantages compared with prior art in that: displacement detection is accurate and has strong versatility.

Description

Technical Field

[0001] This utility model relates to the technical field of variable pistons, specifically to a displacement detection device for a variable piston. Background Technology

[0002] A variable displacement piston is a cylindrical component that reciprocates within a cylinder. By adjusting its own displacement, it changes the displacement of a hydraulic pump or motor, thereby achieving continuous control of flow rate or pressure. Displacement detection equipment for the variable displacement piston is used to monitor the piston position in real time, providing feedback signals to the control system.

[0003] The displacement detection equipment mainly consists of a waveguide, a magnetic ring, and an electronic module. The waveguide moves with the piston, generating a stress wave through the magnetostrictive effect. The module detects the wave propagation time to calculate the displacement. Therefore, it has the following shortcomings:

[0004] 1. Waveguides may deform due to temperature and environmental interference, leading to performance degradation and errors in displacement detection;

[0005] 2. The structure is fixed, the types of variable pistons that can be detected are limited, the scope of application is small, and the versatility is low. Utility Model Content

[0006] I. Technical problems to be solved

[0007] The technical problem this invention aims to solve is that displacement detection is susceptible to temperature and environmental interference, leading to errors and a limited range of applications.

[0008] II. Technical Solution

[0009] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a displacement detection device for a variable piston, including a waveguide connected to the piston and a mounting cylinder connected to the cylinder.

[0010] The waveguide is cylindrical and one end is fixedly connected to the piston. A vertical rod is provided inside the mounting cylinder. A rubber disc with a diameter larger than the vertical rod is provided at the lower end of the vertical rod. The waveguide is sleeved on the vertical rod and a limiting ring is provided on the inner wall of the upper end. The diameter of the inner wall of the limiting ring is smaller than the diameter of the rubber disc, so that the waveguide is detachable.

[0011] The outer wall of the mounting cylinder is fitted with a magnetic ring that mates with the waveguide.

[0012] As an improvement, the waveguides are multiple in number and of different lengths.

[0013] As an improvement, the lower outer wall of the mounting cylinder is provided with a ring with a diameter larger than that of the cylinder, and the lower end of the ring is provided with a rubber plug that is tightly inserted into the mounting cylinder.

[0014] As an improvement, the longitudinal section of the rubber plug is in the shape of an "I", with the diameter of the lower end being larger than the diameter of the inner wall of the cylinder, and the diameter of the upper end being equal to the diameter of the inner wall of the cylinder.

[0015] As an improvement, the diameter of the inner wall of the limiting ring is larger than that of the vertical rod, so that the waveguide does not come into contact with the vertical rod.

[0016] As an improvement, the center of the magnetic ring is aligned with the center of the rubber disc.

[0017] III. Beneficial Effects

[0018] The advantages of this utility model compared with the prior art are as follows:

[0019] 1. This utility model enhances the stability of the waveguide by designing it as a cylindrical shape, and since it is not in contact with the vertical rod, it retains space for minor deformation of the waveguide and allows for timely replacement of deformed waveguides, reducing displacement detection errors.

[0020] 2. The detachable waveguide of this utility model has multiple lengths and can be used with different variable pistons for detection operations, making it highly versatile. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a displacement detection device for a variable piston according to this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of a displacement detection device for a variable piston according to this utility model. Figure 2 .

[0023] Figure 3 This is a front view of a displacement detection device for a variable piston according to this utility model.

[0024] Figure 4 This is a cross-sectional structural diagram of a displacement detection device for a variable piston according to this utility model.

[0025] As shown in the figure: 1. Waveguide; 2. Mounting cylinder; 3. Vertical rod; 4. Rubber disc; 5. Limiting ring; 6. Magnetic ring; 7. Circular ring; 8. Rubber plug. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] As attached Figure 1-4 As shown, a displacement detection device for a variable piston includes a waveguide 1 connected to the piston and an mounting cylinder 2 connected to the cylinder. The waveguide 1 is cylindrical to enhance its own stability, and one end is fixedly connected to the piston. A vertical rod 3 is provided inside the mounting cylinder 2. A rubber disc 4 with a diameter larger than that of the vertical rod 3 is provided at the lower end of the vertical rod 3. The waveguide 1 is sleeved on the vertical rod 3 and a limiting ring 5 is provided on the inner wall of its upper end. The diameter of the inner wall of the limiting ring 5 is smaller than the diameter of the rubber disc 4, so that the waveguide 1 can be manually installed outside the vertical rod 3 through the diameter difference between the limiting ring 5 and the rubber disc 4. That is, the waveguide 1 is detachable, and deformed waveguides can be replaced in time to reduce displacement detection errors.

[0029] Furthermore, the diameter of the inner wall of the limiting ring 5 is larger than that of the vertical rod 3, so that the waveguide 1 does not come into contact with the vertical rod 3, thus preserving space for the slight deformation of the waveguide.

[0030] The outer wall of the mounting cylinder 2 is fitted with a magnetic ring 6 that mates with the waveguide 1. The center of the magnetic ring 6 is aligned with the center of the rubber disc 4, so that the waveguide 1 always has a point of contact with the magnetic ring 6. When the waveguide 1 moves up and down with the variable piston, stress waves are generated through the magnetostrictive effect. The module detects the propagation time of the wave and calculates the displacement.

[0031] Furthermore, the waveguide 1 is multiple in number and of different lengths, which can be used in conjunction with the detection operations of different variable pistons, making it highly versatile;

[0032] Furthermore, the lower outer wall of the mounting cylinder 2 is provided with a ring 7 with a diameter larger than that of the cylinder. The lower end of the ring 7 is provided with a rubber plug 8 that is tightly inserted into the mounting cylinder 2. The longitudinal section of the rubber plug 8 is in the shape of an "I". The diameter of the lower end is larger than that of the inner wall of the cylinder, and the diameter of the upper end is equal to that of the inner wall of the cylinder. The lower end of the I-shaped rubber plug 8 can be locked inside the cylinder port to form an axial limit, preventing the mounting cylinder 2 from axially displaced by the reciprocating motion or vibration of the piston inside the cylinder. This ensures the axial relative position of the waveguide 1 and the magnetic ring is stable. The I-shaped rubber plug is also tightly fixed to prevent radial shaking of the mounting cylinder. Due to the elasticity of the rubber material, it can absorb the stress caused by external vibration or temperature changes. At the same time, it can also prevent dust and hydraulic oil impurities from entering the interior of the mounting cylinder, protecting the core components and improving the environmental adaptability of the equipment.

[0033] It is worth noting that the power supply and control switch of the electrically driven component mentioned in this embodiment can also be provided by the manufacturer. The circuits, electronic components and modules involved are all existing technologies. They can be connected to the external power supply by wired means, which are existing methods and will not be described in detail. Those skilled in the art can fully implement them without further explanation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0036] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A displacement detection device for a variable piston, comprising a waveguide (1) connected to the piston and a mounting cylinder (2) connected to the cylinder barrel, characterized in that: The waveguide (1) is cylindrical and one end is fixedly connected to the piston. The mounting cylinder (2) is provided with a vertical rod (3). The lower end of the vertical rod (3) is provided with a rubber disc (4) with a diameter larger than that of the vertical rod (3). The waveguide (1) is sleeved on the vertical rod (3) and a limiting ring (5) is provided on the inner wall of the upper end. The diameter of the inner wall of the limiting ring (5) is smaller than that of the rubber disc (4), so that the waveguide (1) is detachable. The outer wall of the mounting cylinder (2) is fitted with a magnetic ring (6) that mates with the waveguide (1).

2. The displacement detection device for a variable piston according to claim 1, characterized in that: The waveguides (1) are multiple in number and of different lengths.

3. The displacement detection device for a variable piston according to claim 1, characterized in that: The lower outer wall of the mounting cylinder (2) is provided with a ring (7) with a diameter larger than that of the cylinder, and the lower end of the ring (7) is provided with a rubber plug (8) that is tightly inserted into the mounting cylinder (2).

4. The displacement detection device for a variable piston according to claim 3, characterized in that: The rubber plug (8) has an "I" shaped longitudinal section, with the diameter at the lower end being larger than the diameter of the inner wall of the cylinder and the diameter at the upper end being equal to the diameter of the inner wall of the cylinder.

5. The displacement detection device for a variable piston according to claim 1, characterized in that: The inner diameter of the limiting ring (5) is larger than that of the vertical rod (3), so that the waveguide (1) does not come into contact with the vertical rod (3).

6. The displacement detection device for a variable piston according to claim 1, characterized in that: The center of the magnetic ring (6) is aligned with the center of the rubber disc (4).

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