Pressure sensor for hydraulic shear

Abstract

The pressure sensor comprises a sealing ring, an elastic body, a PCB circuit board, a strain gauge, a stainless steel tube, an amplifier and a cable assembly, the elastic body comprises a mounting portion, a transition portion and a strain portion which are integrally arranged, the transition portion is arranged between the mounting portion and the strain portion, the sealing ring is arranged on the left end face of the mounting portion, and the stainless steel tube is arranged on the sealing ring. An elastic body cavity is formed in the left side end face of the installation part and extends inwards to the strain part, and the elastic body cavity and hydraulic oil of the hydraulic shear are connected to form a loop. Pressure in hydraulic oil is transmitted to the strain gauge through the elastic body, the sensor amplifies signals through the amplifier and transmits the signals out, and therefore the pressure value in the hydraulic shear is obtained and directly displayed on the main screen. According to the utility model, the external threads and the sealing ring are connected with the hydraulic shear, so that hydraulic oil is prevented from leaking; and a high-precision full-bridge strain gauge is used, so that the sensor is high in precision and good in consistency.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a pressure sensor for hydraulic shears. Background Art

[0002] Powerful hydraulic shears are not only used for cutting steel, aluminum, and copper in everyday industrial applications, but are also excellent tools for demolition and rescue operations. Utilizing the latest design and machining, they are constructed from high-strength steel and aviation-grade aluminum alloys for exceptional strength, power, compact size, and light weight. Their unique tool support provides maximum shearing force and durability, while a novel push-button switch and reliable hydraulic quick-connect connector further enhance the user-friendly design. Existing hydraulic shears lack pressure monitoring devices, which can lead to severe wear or even breakage when encountering unusually strong materials during cutting, compromising cutting performance and damaging the tool.

[0003] Therefore, a pressure sensor for hydraulic shears is in urgent need of being proposed. Utility Model Content

[0004] In order to solve the defects of the prior art, the utility model provides a pressure sensor for hydraulic shears.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The utility model provides a pressure sensor for hydraulic shears, comprising a sealing ring, an elastomer, a PCB circuit board, a strain gauge, a stainless steel tube, an amplifier and a cable assembly, wherein the elastomer comprises an integrally arranged mounting portion, a transition portion and a strain portion, the transition portion being arranged between the mounting portion and the strain portion, the sealing ring being arranged on the outer surface of the mounting portion, an elastomer cavity being provided on the left end surface of the mounting portion extending inwardly to the strain portion, the elastomer cavity being connected to the hydraulic oil of the hydraulic shears to form a loop, the PCB circuit board being arranged on the right end surface of the mounting portion, the strain gauge being arranged on the outer surface of the strain portion, the stainless steel tube being sleeved on the outer surfaces of the elastomer and the PCB circuit board, the amplifier being arranged in the stainless steel tube, and the cable assembly being electrically connected to the amplifier.

[0007] Preferably, the mounting part includes a first mounting part, a second mounting part and a third mounting part from left to right, the first mounting part is a cylindrical structure, an external thread is provided on the outer surface of the first mounting part, the outer surface of the second mounting part is a regular hexagonal structure, the third mounting part is a disc structure, and the stainless steel pipe is welded to the third mounting part.

[0008] Preferably, the transition portion is a cylindrical structure, and the outer surface of the cylindrical structure is an inwardly concave arc surface structure in its axial direction.

[0009] Preferably, the strain portion is a cube structure, and the strain gauge is arranged on any outer surface of the cube structure.

[0010] Preferably, a rectangular groove is provided on the PCB circuit board, and the PCB circuit board passes through the strain portion and the transition portion through the rectangular groove and is arranged on the right end surface of the third mounting portion.

[0011] Preferably, the strain gauge is a full-bridge strain gauge.

[0012] Preferably, the amplifier is connected to the stainless steel tube through epoxy resin sealing.

[0013] Preferably, the stainless steel tube has a length of 32-40 mm and a diameter of 16-20 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The utility model is connected to the hydraulic shear through external threads and sealing rings, ensuring that the hydraulic oil does not leak;

[0016] (2) The utility model uses a high-precision full-bridge strain gauge, which makes the sensor high in precision and good in consistency;

[0017] (3) The utility model is equipped with an amplifier, which can directly display the pressure value on the main screen;

[0018] (4) The amplifier in the utility model is placed directly in the sensor cavity, saving space for the hydraulic shear;

[0019] (5) The elastic body of the utility model is made of high-strength stainless steel, which increases the service life of the sensor;

[0020] (6) The amplifier in this utility model is laser welded and epoxy sealed, and has good waterproof and corrosion resistance;

[0021] (7) In the present invention, the elastic body eliminates the influence of installation stress through the transition portion of the arc surface structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a pressure sensor for hydraulic shears of the utility model;

[0023] Figure 2 The utility model is a structural schematic diagram of an elastic body in a pressure sensor for hydraulic shears. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0025] In the description of this utility model, it should be understood that the terms "left" and "right" and the like indicate directions or positional relationships based on the accompanying drawings. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] Example 1

[0028] like Figures 1 to 2 As shown, this embodiment provides a pressure sensor for hydraulic shears, comprising a sealing ring 1, an elastomer 2, a PCB circuit board 3, a strain gauge 4, a stainless steel tube 5, an amplifier 6, and a cable assembly 7. The elastomer 2 includes an integral mounting portion 21, a transition portion 22, and a strain portion 23, with the transition portion 22 disposed between the mounting portion 21 and the strain portion 23. The elastomer is machined from high-strength stainless steel, unlike the welded molding of conventional pressure sensors. It can withstand pressures of 800 bar, offering high safety, strong load-bearing capacity, and a long service life.

[0029] Specifically, the mounting portion 21 includes, from left to right, a first mounting portion 211, a second mounting portion 212, and a third mounting portion 213. The first mounting portion 211 is a cylindrical structure with external threads on its outer surface. The second mounting portion 212 has a regular hexagonal outer surface. The third mounting portion 213 has a disc structure. The sealing ring 1 is disposed on the outer surface of the mounting portion 21 and is located in a mounting groove to the right of the first mounting portion 211. An elastomeric cavity is defined on the left end surface of the mounting portion 21, extending inward toward the strain relief portion. This cavity is connected to the hydraulic oil circuit of the hydraulic shear.

[0030] Specifically, the transition portion 22 is a cylindrical structure, and the outer surface of the cylindrical structure is an inwardly concave arc surface structure in its axial direction. The transition portion of the arc surface structure can eliminate the influence of the installation stress.

[0031] Specifically, the strain portion 23 is a cube structure, and the strain gauge 4 is disposed on the outer surface of the cube structure.

[0032] In this embodiment, a rectangular groove is opened on the PCB circuit board 3. The PCB circuit board 3 passes through the strain portion 23 and the transition portion 22 through the rectangular groove and is then arranged on the right end surface of the third mounting portion 213.

[0033] In this embodiment, the strain gauge 4 is provided on the outer surface of the strain portion 23 . The strain gauge 4 is a full-bridge strain gauge, which makes the sensor have high precision and good consistency.

[0034] In this embodiment, the stainless steel tube 5 has a length of 32 mm, 38 mm, or 40 mm, and a diameter of 16 mm, 18 mm, or 20 mm, depending on practical needs. The stainless steel tube 5 is sleeved over the outer surfaces of the elastomer 2 and PCB 3. The amplifier 6 is sealed within the stainless steel tube 5 via epoxy resin 8, ensuring excellent waterproofing and corrosion resistance. Furthermore, the amplifier's direct placement within the stainless steel tube saves space in the hydraulic shear. The cable assembly 7 is electrically connected to the amplifier 6 to transmit the signal.

[0035] The working principle of this embodiment is further described below:

[0036] During installation, the first mounting portion on the left side is fastened to the hydraulic shear via external threads and sealed with a sealing ring. This connects the elastomer cavity and the hydraulic oil of the hydraulic shear to form a circuit, thereby transmitting the pressure within the hydraulic shear. This sealed connection prevents hydraulic oil leakage. The third mounting portion on the right side is welded to the stainless steel pipe via the outer surface of the disc structure, effectively protecting the strain gauge and amplifier.

[0037] When the hydraulic shear is working, the pressure in the hydraulic oil is transmitted to the strain gauge through the elastic body, and then the signal is amplified and transmitted through the amplifier, thereby obtaining the pressure value in the hydraulic shear and displaying it directly on the main screen.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pressure sensor for hydraulic shears, characterized in that: The invention comprises a sealing ring (1), an elastic body (2), a PCB circuit board (3), a strain gauge (4), a stainless steel tube (5), an amplifier (6) and a cable assembly (7), wherein the elastic body (2) comprises an integrally arranged mounting portion (21), a transition portion (22) and a strain portion (23), wherein the transition portion (22) is arranged between the mounting portion (21) and the strain portion (23), the sealing ring (1) is arranged on the outer surface of the mounting portion (21), an elastic body cavity is provided on the left end surface of the mounting portion (21) extending inwardly to the strain portion, and the elastic body cavity is connected to the hydraulic oil of the hydraulic shear to form a loop, the PCB circuit board (3) is arranged on the right end surface of the mounting portion (21), the strain gauge (4) is arranged on the outer surface of the strain portion (23), the stainless steel tube (5) is sleeved on the outer surfaces of the elastic body (2) and the PCB circuit board (3), the amplifier (6) is arranged in the stainless steel tube (5), and the cable assembly (7) is electrically connected to the amplifier (6).

2. A pressure sensor for hydraulic shears according to claim 1, characterized in that: The mounting portion (21) comprises, from left to right, a first mounting portion (211), a second mounting portion (212), and a third mounting portion (213), wherein the first mounting portion (211) is a cylindrical structure, and an external thread is provided on the outer surface of the first mounting portion (211), the outer surface of the second mounting portion (212) is a regular hexagonal structure, and the third mounting portion (213) is a disc structure, and the stainless steel pipe (5) is welded to the third mounting portion (213).

3. A pressure sensor for hydraulic shears according to claim 2, characterized in that: The transition portion (22) is a cylindrical structure, and the outer surface of the cylindrical structure is an inwardly concave arc surface structure in its axial direction.

4. A pressure sensor for hydraulic shears according to claim 3, characterized in that: The strain portion (23) is a cube structure, and the strain gauge (4) is arranged on any outer surface of the cube structure.

5. A pressure sensor for hydraulic shears according to claim 4, characterized in that: A rectangular slot is provided on the PCB circuit board (3), and the PCB circuit board (3) passes through the strain portion (23) and the transition portion (22) through the rectangular slot and is then arranged on the right end surface of the third mounting portion (213).

6. A pressure sensor for hydraulic shears according to claim 1, characterized in that: The strain gauge (4) is a full-bridge strain gauge.

7. A pressure sensor for hydraulic shears according to claim 1, characterized in that: The amplifier (6) is sealed and connected to the stainless steel tube (5) through epoxy resin (8).

8. A pressure sensor for hydraulic shears according to claim 1, characterized in that: The stainless steel tube (5) has a length of 32-40 mm and a diameter of 16-20 mm.

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