Underwater shaft pin pressure composite sensor

Abstract

An underwater shaft pin pressure composite sensor comprises a cylindrical shaft pin sensor, a cylindrical pressure sensor is arranged at one end, in the length direction, of the shaft pin sensor, shells of the cylindrical pressure sensor and the shaft pin sensor are integrally designed, a medium inflow channel of the pressure sensor is formed in the end face, away from one side of the shaft pin sensor, of the pressure sensor, and a first threaded hole is formed in the shell of the pressure sensor; a second threaded hole is formed in the position, corresponding to the first threaded hole, of the pressure sensor shell, a watertight connector is arranged beside the pressure sensor and comprises a socket and a plug, the socket and the plug are in a sealed state after being in butt joint, and an outer threaded section is arranged at the end, away from the plug, of the socket and is in threaded fit with the first threaded hole. And the shaft pin sensor and the pressure sensor are locked and fixed through locking bolts matched with the second threaded holes, and signal lines of the shaft pin sensor and the pressure sensor are electrically connected with the socket. The traditional shaft pin sensor and the pressure sensor are combined for use, and the shaft pin sensor is compensated by using the reading of the pressure sensor, so that the precision is improved.

Description

Technical Field

[0001] The utility model relates to an underwater pin pressure composite sensor. Background Art

[0002] Referring to Figure 1 , the pin sensor is a special sensor for measuring the radial load of components such as bearings and pulleys or the tension of wire ropes. It can be installed in place of the pulley pin in the structure for radial force measurement. According to different uses, it can be conveniently installed in the hooks, shackles, movable pulleys (groups), fixed pulleys (groups), wedge joints, wire rope thimbles, marine rigging, open turnbuckles, rod heads, and fork joints, connection forks, eyebolts, and the shaft holes of steel wheels at the connection of two metal structures. It can not only perform the function of the original shaft but also act as a weighing and force-measuring sensor, thus greatly simplifying the mechanical components of the entire weighing and force-measuring control system. Its structural principle is a shear-type resistive strain sensor with both ends fixed and centered loading. This product selects high-quality stainless steel as the elastic body and a foil resistive strain gauge as the sensitive conversion element. The bearing seat is installed in the middle of the sensor, and both ends of the sensor are fixed on the base. When the pin sensor bears a load, the load is transmitted to the base through the shear elastic beams at both ends, generating a strain proportional to the load in the elastic beams, which is converted into a corresponding electrical signal through the strain gauge.

[0003] Referring to Figure 2 , Figure 2 For the common water pressure sensor in the market, a medium inlet channel (this channel is not connected to the electronic control part of the sensor) is provided on one end face, and a diaphragm is provided in the channel. Its principle is that when the liquid medium enters the channel and directly acts on the diaphragm of the sensor, the diaphragm will generate a micro-displacement proportional to the medium pressure, thereby causing a change in the resistance of the sensor. This change is then detected by the electronic circuit and converted into a standard electrical signal corresponding to the pressure. For details, reference can be made to Chinese Patent CN109827701A.

[0004] The problem existing in the prior art is that when the pin sensor is used underwater, due to the existence of water pressure, it will interfere with the parameters of the pin sensor, thus affecting the normal operation of the sensor. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an underwater pin pressure composite sensor, which combines the traditional pin sensor with a pressure sensor and uses the reading of the pressure sensor to compensate the pin sensor to improve the accuracy.

[0006] To solve the above technical problems, an underwater pin pressure composite sensor is provided, which includes a cylindrical pin sensor. One end of the pin sensor in the length direction is provided with a cylindrical pressure sensor. The pin sensor and the pressure sensor are coaxially connected. The medium inflow channel of the pressure sensor is arranged on the end face on the side far from the pin sensor along the length direction of the pressure sensor. The outer shells of the pin sensor and the pressure sensor are integrally designed. The inner cavities of the pin sensor and the pressure sensor are connected. On the circumferential side of the pressure sensor shell, on the side close to the pin sensor, there is a first threaded hole penetrating the pressure sensor shell along its radial direction. At the position of the pressure sensor shell corresponding to the first threaded hole, there is a second threaded hole penetrating the first threaded hole and the inner cavity of the pressure sensor along its radial direction. A watertight connector is arranged beside the pressure sensor. The watertight connector includes a socket and a plug. After the socket and the plug are docked, they are in a sealed state. One end of the socket far from the plug is provided with an external threaded section matching the first threaded hole. The external threaded section is in threaded cooperation with the first threaded hole and is locked and fixed by a locking bolt matching the second threaded hole. The signal lines of the pin sensor and the pressure sensor are both electrically connected to the socket.

[0007] For the sake of simplicity in explaining the problem, hereinafter, an underwater pin pressure composite sensor described in the present invention is simply referred to as this composite sensor.

[0008] Advantages of this composite sensor:

[0009] Since this composite sensor is arranged to work underwater, this composite sensor uses the real-time value of the water pressure measured by the pressure sensor to compensate and calibrate the parameters of the pin sensor, so as to eliminate the influence of water pressure on the sensor. The outer shells of the pin sensor and the pressure sensor are integrally designed and the signal lines are led out through the watertight connector, which can also ensure sufficient sealing performance.

[0010] To achieve better use effects of this composite sensor, its preferred solutions are as follows:

[0011] Preferably, at the position on the circumferential side of the pressure sensor shell corresponding to the first threaded hole, there is a milling plane perpendicular to the central axis of the first threaded hole. At the tail of the external threaded section of the socket, there is an annular step surface perpendicular to the axial direction of the external threaded section. There is an annular groove on the annular step surface. A sealing ring matching the annular groove and protruding from the annular groove is arranged in the annular groove. When the external threaded section is screwed into the first threaded hole, the sealing ring is pressed between the milling plane and the step surface to be in a circumferential sealing state.

[0012] By setting the milling plane and the step surface and arranging a sealing ring between the two, a good sealing effect can be achieved, strengthening the sealing effect at the joint of the watertight connector and this composite sensor. Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of an existing pin sensor.

[0014] Figure 2 It is a schematic structural diagram of an existing water pressure sensor (pressure sensor).

[0015] Figure 3 It is a three-dimensional view of this composite sensor.

[0016] Figure 4 It is a sectional view of this composite sensor.

[0017] Figure 5 It is Figure 4 a partial enlarged view of part A in

[0018] Figure 6 It is a schematic structural diagram of a watertight joint.

[0019] Figure 7 It is a schematic structural diagram of the socket in the watertight joint. Specific embodiments

[0020] Refer to Figures 3 - 7 , an underwater pin pressure composite sensor, including a cylindrical pin sensor 1, one end of the pin sensor 1 in the length direction is provided with a cylindrical pressure sensor 2, the pin sensor 1 and the pressure sensor 2 are coaxially connected, the medium inflow channel 6 of the pressure sensor 2 is arranged on the end face on the side far from the pin sensor 1 along the length direction of the pressure sensor 2, the outer shells of the pin sensor 1 and the pressure sensor 2 are integrally designed, the inner cavities of the pin sensor 1 and the pressure sensor 2 are communicated, on the circumferential side position of the outer shell of the pressure sensor 2, one side close to the pin sensor 1 is provided with a first threaded hole 21 that penetrates the outer shell of the pressure sensor 2 along its radial direction, at the position of the outer shell of the pressure sensor 2 corresponding to the first threaded hole 21, a second threaded hole 22 that penetrates the first threaded hole 21 and the inner cavity of the pressure sensor 2 along its radial direction is provided, a watertight joint 3 is arranged beside the pressure sensor 2, the watertight joint 3 includes a socket 31 and a plug 32, the socket 31 and the plug 32 are in a sealed state after being docked, one end of the socket 31 away from the plug 32 is provided with an external thread section 5 that matches the first threaded hole 21, the external thread section 5 is in threaded cooperation with the first threaded hole 21 and is locked and fixed by a locking bolt 221 that matches the second threaded hole 22, and the signal lines of the pin sensor 1 and the pressure sensor 2 are both electrically connected to the socket 31.

[0021] On the circumferential side of the housing of the pressure sensor 2, at a position corresponding to the first threaded hole 21, a milling plane 23 perpendicular to the central axis of the first threaded hole 21 is provided. At the tail of the external thread section 5 of the socket 31, an annular step surface 311 perpendicular to the axial direction of the external thread section 5 is provided. An annular groove 4 is provided on the annular step surface 311. A sealing ring 41 that matches the annular groove 4 and protrudes from the annular groove 4 is provided in the annular groove 4. When the external thread section 5 is screwed into the first threaded hole 21, the sealing ring 41 is pressed between the milling plane 23 and the step surface 311 to form a circumferential sealing state.

[0022] Advantages of this composite sensor:

[0023] Since this composite sensor is arranged to work underwater, this composite sensor uses the real-time value of the water pressure measured by the pressure sensor 2 to compensate and calibrate the parameters of the pin sensor 1, so that the influence of the water pressure on the sensor can be eliminated. The housings of the pin sensor 1 and the pressure sensor 2 are integrally designed and the signal lines are led out through the watertight joint 3, which can also ensure sufficient sealing performance.

[0024] By providing the milling plane 23 and the step surface 311 and arranging the sealing ring 41 between the two, a good sealing effect can be achieved, strengthening the sealing effect at the joint between the watertight joint 3 and this composite sensor.

[0025] Since the pin sensor 1, the pressure sensor 2, and the watertight joint 3 are all existing mature technologies, for the sake of simplicity in explaining the problem, the internal structures of the two sensors, the data line connection methods between the two sensors and the watertight joint, and the sealing principle of the cooperation between the plug and the socket of the watertight joint itself are not described in detail in this embodiment and the accompanying drawings.

Claims

1. An underwater axle pin pressure composite sensor, characterized in that: It includes a cylindrical axle pin sensor, a cylindrical pressure sensor is provided at one end in the length direction of the axle pin sensor, the axle pin sensor and the pressure sensor are coaxially connected, the medium inflow channel of the pressure sensor is provided on the end face away from the axle pin sensor along the length direction of the pressure sensor, the axle pin sensor and the pressure sensor housing are of integrated design, the inner cavities of the axle pin sensor and the pressure sensor are connected, a first threaded hole is provided on the side of the circumferential side of the pressure sensor housing close to the axle pin sensor, a second threaded hole is provided on the housing of the pressure sensor corresponding to the first threaded hole, a watertight joint is provided on the side of the pressure sensor, the watertight joint includes a socket and a plug, the socket and the plug are in a sealed state after being connected, an external threaded section matching the first threaded hole is provided on the end of the socket away from the plug, the external threaded section is threadedly matched with the first threaded hole, and is locked and fixed by a locking bolt matching the second threaded hole, and the signal lines of the axle pin sensor and the pressure sensor are electrically connected to the socket.

2. The underwater axle pin pressure composite sensor according to claim 1, characterized in that: A milling plane perpendicular to the central axis of the first threaded hole is provided on the circumferential side of the pressure sensor housing corresponding to the first threaded hole, an annular step surface perpendicular to the axial direction of the external threaded section is provided at the tail of the external threaded section of the socket, an annular groove is provided on the annular step surface, a sealing ring matching the annular groove and protruding from the annular groove is provided in the annular groove, and when the external threaded section is screwed to the first threaded hole, the sealing ring is pressed between the milling plane and the step surface to form a circumferential sealing state.

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