Piezoelectric acceleration and speed composite sensor

Abstract

The invention relates to a piezoelectric acceleration and speed composite sensor, which belongs to the field of chemical equipment and comprises a base, an isolation plate is fixed on the inner bottom wall of the base, a composite mechanism for compositing an acceleration sensor and a speed sensor is arranged on the upper surface of the isolation plate, and a sealing socket is arranged at the top of the base. The left side and the right side of the sealing socket are respectively provided with a positioning mechanism used for positioning the sealing socket. According to the piezoelectric acceleration and speed composite sensor, the acceleration sensor and the speed sensor are compounded, so that the operation state of equipment can be detected, and when the equipment breaks down, an original acceleration signal can be detected and analyzed, and therefore, troubles caused by replacement of the sensor and shutdown can be greatly reduced; and meanwhile, certain labor cost and troubles caused by shutdown can be saved, the sealing socket and the base can be positioned through the positioning mechanism, subsequent welding is facilitated, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, in particular to a piezoelectric acceleration and velocity composite sensor. Background Art

[0002] Installing acceleration sensors on various industrial machinery and equipment can monitor the vibration of the equipment in real time during operation. When the equipment is operating normally, the vibration has a certain regularity and amplitude range. When the equipment fails, the acceleration of the vibration will change. By capturing these abnormal acceleration signals through sensors, potential problems with the equipment can be discovered in time, so that maintenance can be arranged in advance to avoid sudden equipment failures causing production interruptions and greater losses.

[0003] At present, most industrial sites use current type vibration velocity sensors connected to PLC for threshold vibration warning schemes. Such schemes only determine whether the equipment is operating normally by the size of the vibration. However, if you need to know the specific reason for the equipment's existence, you need to use the original acceleration signal for diagnostic analysis. At this time, you need to stop the machine and replace the acceleration sensor for further analysis. For many on-site sensors, the replacement operation is very inconvenient. Some on-site machinery and equipment cannot be stopped at will, so this will bring a lot of inconvenience. Based on this, a piezoelectric acceleration and velocity composite sensor is proposed to solve the above problems. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a piezoelectric acceleration and velocity composite sensor, which has the advantages of reducing the trouble caused by replacing sensors and shutting down. It solves the problem in the prior art that the replacement operation of many on-site sensors is very inconvenient and some on-site machinery and equipment cannot be shut down at will, thus causing many inconveniences.

[0005] To achieve the above object, the present invention provides the following technical solution: a piezoelectric acceleration and velocity composite sensor, comprising a base, an isolation plate is fixed to the inner bottom wall of the base, a composite mechanism for composite the acceleration sensor and the velocity sensor is provided on the upper surface of the isolation plate, a sealing socket is provided on the top of the base, and positioning mechanisms for positioning the sealing socket are provided on both the left and right sides of the sealing socket;

[0006] The composite structure includes a core body fixed on an isolation plate, a piezoelectric crystal is bonded to the top of the right side of the core body, a mass block is bonded to the outside of the core body and the piezoelectric crystal, a fastening ring is sleeved on the outer surface of the mass block, an inner shell is bonded to the outside of the core body, a circuit board is provided in the inner cavity of the inner shell, an annular groove is opened on the top of the inner shell, a cover plate is placed in the inner cavity of the annular groove, and a wire outlet hole is opened on the upper surface of the cover plate.

[0007] Furthermore, the base is hollow inside and consists of two parts, a top and a bottom. The top is in the shape of a cylinder, and the bottom is in the shape of a regular hexagonal prism.

[0008] Furthermore, the outer diameter of the bottom of the sealing socket is matched with the inner diameter of the base, and the size of the top of the sealing socket is larger than the inner diameter of the base.

[0009] Furthermore, protrusions are fixed on opposite sides of the left and right side walls of the inner cavity of the inner shell, and the circuit board is fixed on the upper surfaces of the two protrusions.

[0010] Furthermore, the cross-sectional shape of the core body is an inverted T-shape, and the size of the cover plate is adapted to the size of the inner cavity of the annular groove.

[0011] Furthermore, the positioning mechanism includes a connecting plate frame fixed on the left and right sides of the sealing socket, an arc box is fixed on the top of the left and right sides of the base, a threaded rod is rotatably connected to the bottom between the opposite sides of the left and right side walls of the inner cavity of the arc box through a bearing, a sliding block is threadedly connected to the outer surface of the threaded rod, a driving box is fixed to the upper surface of the sliding block, a reset spring is fixed to the inner bottom wall of the driving box, a movable plate is fixed to the upper surface of the reset spring, the tops of the movable plates on the left and right sides both penetrate and extend to the upper side of the arc box and a limiting block is fixed to the top of the opposite side.

[0012] Furthermore, the opposite sides of the threaded rods at the left and right ends penetrate and extend to the outside of the arc box and are fixed with handles. The inner bottom wall of the arc box is fixed with a limit strip, and the bottom of the sliding block performs horizontal linear motion in the inner cavity of the limit strip.

[0013] Furthermore, a guide hole is provided on the upper surface of the arc box, a limit hole matching the size of the limit block is provided on the bottom of the left side of the connecting plate frame, and limit grooves matching the size of the limit block are provided on the tops of the left and right sides of the base.

[0014] Furthermore, a limit assembly is provided at the bottom of the opposite side of the two arc boxes, and the limit assembly includes a mounting block fixed to the bottom of the opposite side of the two arc boxes, and the front and rear sides of the lower surface of the mounting block are hingedly connected with clamping rings, and a torsion spring is provided at the top between the opposite sides of the two clamping rings, and a clamping rod is fixed at the opposite side of the two clamping rings, and the outer surface of the threaded rod is provided with a plurality of evenly distributed clamping grooves.

[0015] Furthermore, the clamping slots are located at the front and rear sides of the clamping rod, and the inner diameter of the clamping slots is matched with the outer diameter of the clamping rod.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] The piezoelectric acceleration and velocity composite sensor, by combining an acceleration sensor with a velocity sensor, can not only detect the operating status of the equipment, but also detect and analyze the original acceleration signal when the equipment fails, thereby greatly reducing the trouble caused by replacing sensors and downtime, and can also save certain labor costs and the trouble caused by downtime. The setting of the positioning mechanism can position the sealing socket and the base, which is convenient for subsequent welding and improves the efficiency during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a front view schematic diagram of the appearance structure of the present invention;

[0020] Figure 3 It is a top view schematic diagram of the structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the composite mechanism structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the positioning mechanism structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the sliding block and the threaded rod of the present invention;

[0024] Figure 7 It is a schematic diagram of the structure of the limiting component of the present invention.

[0025] In the figure: 1 base, 2 isolation plate, 3 composite mechanism, 301 core, 302 piezoelectric crystal, 303 mass block, 304 fastening ring, 305 inner shell, 306 circuit board, 307 annular groove, 308 cover plate, 309 outlet hole, 4 sealed socket, 5 positioning mechanism, 501 connecting plate frame, 502 arc box, 503 threaded rod, 504 sliding block, 505 driving box, 506 reset spring, 507 movable plate, 508 limit block, 6 limit assembly, 601 mounting block, 602 clamping ring, 603 torsion spring, 604 clamping rod, 605 clamping slot. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 3A piezoelectric acceleration and velocity composite sensor in this embodiment includes a base 1, an isolation plate 2 is fixed to the inner bottom wall of the base 1, a composite mechanism 3 for composite the acceleration sensor and the velocity sensor is provided on the upper surface of the isolation plate 2, a sealing socket 4 is provided on the top of the base 1, and a positioning mechanism 5 for positioning the sealing socket 4 is provided on the left and right sides of the sealing socket 4.

[0028] In this embodiment, the base 1 is hollow inside and consists of two parts, a top and a bottom. The top is a cylinder and the bottom is a regular hexagonal prism. The outer diameter of the bottom of the sealing socket 4 matches the inner diameter of the base 1, and the size of the top of the sealing socket 4 is larger than the inner diameter of the base 1.

[0029] See also Figures 4 to 5 In order to reduce the trouble caused by replacing sensors and downtime, the composite mechanism 3 in this embodiment includes a core 301 fixed on the isolation plate 2, a piezoelectric crystal 302 is bonded to the top of the right side of the core 301, a mass block 303 is bonded to the outside of the core 301 and the piezoelectric crystal 302, and a fastening ring 304 is sleeved on the outer surface of the mass block 303. When the acceleration and velocity composite sensor is composited, the piezoelectric crystal 302 is bonded to the right side of the core 301, and then the piezoelectric crystal 302 and the mass block 303 are bonded to the outside of the piezoelectric crystal 302. The outer side of the core 301 is glued with a mass block 303 and a fastening ring 304, and then the test sensitive part is insulated and its sensitivity is initially tested, and then the sensitive part is placed in a high and low temperature alternating damp heat test box for aging. The outer side of the core 301 is glued with an inner shell 305, the inner cavity of the inner shell 305 is provided with a circuit board 306, the top of the inner shell 305 is provided with an annular groove 307, the inner cavity of the annular groove 307 is placed with a cover plate 308, and the upper surface of the cover plate 308 is provided with a wire outlet hole 309.

[0030] It can be understood that the sensitive part is then adhered to the inner shell 305 and glued into the inner shell 305, placed in an 80°C oven for curing for 2 hours, taken out and cooled, the circuit board 306 is installed in the inner shell 305, the semi-finished sensor is tested, and then the output of the sensor is adjusted to the specified range by adjusting the resistance, and after completion, it is powered on for aging, and silicone potting glue is poured into the inner shell 305. After curing, the potting effect is inspected, and then the plug and the inner shell 305 are fixed with a laser welding machine, and then the output is tested, the semi-finished sensor with dots is welded, and then the sensor is sandblasted, and finally the finished sensor is tested.

[0031] In this embodiment, protrusions are fixed on opposite sides of the left and right side walls of the inner cavity of the inner shell 305, the circuit board 306 is fixed on the upper surfaces of the two protrusions, the cross-sectional shape of the core body 301 is an inverted T shape, and the size of the cover plate 308 is adapted to the size of the inner cavity of the annular groove 307.

[0032] In addition, the positive piezoelectric effect of the piezoelectric ceramic chip is used to generate a charge proportional to the acceleration in the mass system. The acceleration charge is transformed and amplified by the circuit and converted into an acceleration voltage signal output for diagnostic analysis. At the same time, the transformed signal is integrated, amplified, RMS converted and V / I converted into a velocity current signal for threshold alarm.

[0033] It should be noted that by combining the acceleration sensor with the speed sensor, not only can the operating status of the equipment be detected, but also the original acceleration signal can be detected and analyzed when the equipment fails. It can simultaneously output the speed threshold alarm signal and the original acceleration signal for diagnostic analysis, thereby greatly reducing the trouble caused by replacing sensors and downtime, and also saving certain labor costs and the trouble caused by downtime.

[0034] See also Figure 6 In order to position the sealing socket 4 and the base 1, the positioning mechanism 5 in this embodiment includes a connecting plate frame 501 fixed on the left and right sides of the sealing socket 4, and an arc box 502 is fixed on the top of the left and right sides of the base 1. The bottom between the opposite sides of the left and right side walls of the inner cavity of the arc box 502 is rotatably connected with a threaded rod 503 through a bearing. The outer surface of the threaded rod 503 is threadedly connected with a sliding block 504, and the upper surface of the sliding block 504 is fixed with a driving box 505. By rotating the threaded rod 503, the rotation of the threaded rod 503 causes the sliding block 504 threadedly connected on its surface to move toward the side close to the base 1, and the movement of the sliding block 504 causes the sliding block 504 fixed on its upper surface to move toward the side close to the base 1. The driving box 505 moves, and a return spring 506 is fixed to the inner bottom wall of the driving box 505. A movable plate 507 is fixed to the upper surface of the return spring 506. The tops of the movable plates 507 on the left and right sides penetrate and extend to the upper side of the arc box 502, and a limit block 508 is fixed to the top of the opposite side. The movable plate 507 moves in the inner cavity of the guide hole. When the movable plate 507 drives the limit block 508 to move to the limit hole opened in the connecting plate frame 501, the movable plate 507 is pulled upward. The movement of the movable plate 507 causes the limit block 508 to move and stretches the return spring 506 in the driving box 505, so that the movable plate 507 drives the limit block 508 to rise.

[0035] In this embodiment, the opposite sides of the left and right threaded rods 503 penetrate and extend to the outside of the arc box 502 and are fixed with handles. The inner bottom wall of the arc box 502 is fixed with a limit strip, and the bottom of the sliding block 504 makes horizontal linear motion in the inner cavity of the limit strip. The set limit strip can limit the movement of the sliding block 504, so that the sliding block 504 can only move in a linear direction.

[0036] Among them, a guide hole is opened on the upper surface of the arc box 502, a limit hole matching the size of the limit block 508 is opened on the bottom of the left side of the connecting plate frame 501, and limit grooves matching the size of the limit block 508 are opened on the top of the left and right sides of the base 1.

[0037] It can be understood that by continuing to rotate the threaded rod 503 so that the limit block 508 enters the inner cavity of the limit hole and the limit groove, the limit on the movable plate 507 can be loosened. At this time, the reset spring 506 retracts without being restricted, so that the bottom of the limit block 508 can be fitted with the inner bottom wall of the limit hole and the limit groove, thereby positioning the sealing socket 4 to facilitate subsequent welding processing.

[0038] See also Figure 7 In order to limit the rotation angle of the threaded rod 503, the bottom of the two arc boxes 502 on the opposite side of the embodiment are provided with a limit assembly 6, the limit assembly 6 includes a mounting block 601 fixed to the bottom of the two arc boxes 502 on the opposite side, the front and rear sides of the lower surface of the mounting block 601 are hingedly connected with a clamping ring 602, and a torsion spring 603 is provided at the top between the opposite sides of the two clamping rings 602. The two clamping rings 602 are moved to the side away from the threaded rod 503. The angle change of 602 causes the angle of the torsion spring 603 to change. A clamping rod 604 is fixed on the opposite side of the two clamping circles 602. The outer surface of the threaded rod 503 is provided with a plurality of evenly distributed clamping grooves 605. The rotation of the two clamping circles 602 drives the two clamping rods 604 to move out of the inner cavity of the clamping groove 605, which can release the limit of the threaded rod 503. The gap between the two clamping circles 602 is increased, and the threaded rod 503 can be rotated, thereby ensuring the angle stability of the threaded rod 503.

[0039] In this embodiment, the card slot 605 is located at the front side and the rear side of the card rod 604 , and the inner diameter of the card slot 605 is matched with the outer diameter of the card rod 604 .

[0040] It should be noted that by limiting the angle of the threaded rod 503 , it is possible to prevent the threaded rod 503 from rotating due to contact, thereby improving the stability of the positioning of the sealing socket 4 and the base 1 by the limiting block 508 .

[0041] The working principle of the above embodiment is:

[0042] (1) When assembling the acceleration and velocity composite sensor, the piezoelectric crystal 302 is glued to the right side of the core 301, and then the mass block 303 is glued to the outside of the piezoelectric crystal 302 and the core 301 and the fastening ring 304 is put on. Then the test sensitive part is insulated and its sensitivity is initially tested. Then the sensitive part is placed in a high and low temperature alternating damp heat test box for aging. After that, the sensitive part is glued to the inner shell 305 and glued into the inner shell 305. After being placed in an 80°C oven for curing for 2 hours, it is taken out and cooled. The circuit board 306 is installed in the inner shell 305. The semi-finished sensor is tested, and then the output of the sensor is adjusted to the specified range by adjusting the resistance. After completion, it is powered on for aging, and silicone potting glue is poured into the inner shell 305. After curing, the potting effect is checked, and then the plug and the inner shell 305 are fixed with a laser welding machine, and then the output is tested. The semi-finished sensor with dots is welded, and then the sensor is sandblasted, and finally the finished sensor is tested; the positive piezoelectric effect of the piezoelectric ceramic chip is utilized - the mass system generates a charge amount that is proportional to the vibration amount and the acceleration, and the acceleration charge is converted and amplified by the circuit to become an acceleration voltage signal output for diagnostic analysis, and the converted signal is integrated and amplified, RMS converted and V / I converted into a speed current signal for threshold alarm.

[0043] (2) After the bottom of the sealing socket 4 enters the inner cavity of the base 1, the threaded rod 503 can be rotated. The rotation of the threaded rod 503 causes the sliding block 504 threadedly connected to its surface to move toward the side close to the base 1. The movement of the sliding block 504 causes the driving box 505 fixed on its upper surface to move. At this time, the movable plate 507 moves in the inner cavity of the guide hole. When the movable plate 507 drives the limit block 508 to move to the limit hole opened in the connecting plate frame 501, the movable plate 507 is pulled upward. The movement of the movable plate 507 causes the limit block 508 to move and stretches the reset spring 506 in the driving box 505, so that the movable plate 507 drives the limit block 508 to rise. The threaded rod 503 is continued to be rotated so that the limit block 508 enters the limit hole and The inner cavity of the limiting groove can release the limit on the movable plate 507. At this time, the reset spring 506 retracts without being restricted, so that the bottom of the limiting block 508 can fit with the limiting hole and the inner bottom wall of the limiting groove, so that the position of the sealing socket 4 can be positioned, which is convenient for subsequent welding processing; before the threaded rod 503 rotates, the two clamping rings 602 need to be moved to the side away from the threaded rod 503. The angle change of the two clamping rings 602 causes the angle of the torsion spring 603 to change. The rotation of the two clamping rings 602 drives the two clamping rods 604 to move out of the inner cavity of the clamping groove 605, which can release the limit on the threaded rod 503, and the gap between the two clamping rings 602 is increased, so that the threaded rod 503 can be rotated, thereby ensuring the angle stability of the threaded rod 503.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A piezoelectric acceleration and velocity composite sensor, comprising a base (1), characterized in that: An isolation plate (2) is fixed to the inner bottom wall of the base (1); a composite mechanism (3) for composite the acceleration sensor and the velocity sensor is provided on the upper surface of the isolation plate (2); a sealing socket (4) is provided on the top of the base (1); and positioning mechanisms (5) for positioning the sealing socket (4) are provided on both the left and right sides of the sealing socket (4); The composite structure (3) comprises a core (301) fixed on an isolation plate (2); a piezoelectric crystal (302) is bonded to the top of the right side of the core (301); a mass block (303) is bonded to the outer sides of the core (301) and the piezoelectric crystal (302); a fastening ring (304) is sleeved on the outer surface of the mass block (303); an inner shell (305) is bonded to the outer side of the core (301); a circuit board (306) is provided in the inner cavity of the inner shell (305); an annular groove (307) is provided on the top of the inner shell (305); a cover plate (308) is placed in the inner cavity of the annular groove (307); and a wire outlet hole (309) is provided on the upper surface of the cover plate (308).

2. The piezoelectric acceleration and velocity composite sensor according to claim 1, characterized in that: The base (1) is hollow inside and consists of two parts, a top and a bottom. The top is in the shape of a cylinder, and the bottom is in the shape of a regular hexagonal prism.

3. The piezoelectric acceleration and velocity composite sensor according to claim 1, characterized in that: The outer diameter of the bottom of the sealing socket (4) is matched to the inner diameter of the base (1), and the size of the top of the sealing socket (4) is larger than the inner diameter of the base (1).

4. The piezoelectric acceleration and velocity composite sensor according to claim 1, characterized in that: Protrusions are fixed on opposite sides of the left and right side walls of the inner cavity of the inner shell (305), and the circuit board (306) is fixed on the upper surfaces of the two protrusions.

5. The piezoelectric acceleration and velocity composite sensor according to claim 1, characterized in that: The cross-sectional shape of the core body (301) is an inverted T-shape, and the size of the cover plate (308) is adapted to the size of the inner cavity of the annular groove (307).

6. The piezoelectric acceleration and velocity composite sensor according to claim 1, characterized in that: The positioning mechanism (5) comprises a connecting plate frame (501) fixed on the left and right sides of the sealing socket (4); an arc box (502) is fixed on the top of the left and right sides of the base (1); a threaded rod (503) is rotatably connected to the bottom between the left and right side walls of the inner cavity of the arc box (502) on the opposite sides through a bearing; a sliding block (504) is threadedly connected to the outer surface of the threaded rod (503); a driving box (505) is fixed on the upper surface of the sliding block (504); a reset spring (506) is fixed on the inner bottom wall of the driving box (505); a movable plate (507) is fixed on the upper surface of the reset spring (506); the tops of the movable plates (507) on the left and right sides both penetrate and extend to the upper side of the arc box (502); and a limiting block (508) is fixed on the top of the opposite side.

7. The piezoelectric acceleration and velocity composite sensor according to claim 6, characterized in that: The opposite sides of the threaded rods (503) at the left and right ends penetrate and extend to the outside of the arc box (502) and are fixed with handles. The inner bottom wall of the arc box (502) is fixed with a limit strip, and the bottom of the sliding block (504) performs horizontal linear motion in the inner cavity of the limit strip.

8. The piezoelectric acceleration and velocity composite sensor according to claim 6, characterized in that: A guide hole is provided on the upper surface of the arc box (502), a limit hole matching the size of the limit block (508) is provided on the bottom of the left side of the connecting plate frame (501), and limit grooves matching the size of the limit block (508) are provided on the tops of the left and right sides of the base (1).

9. The piezoelectric acceleration and velocity composite sensor according to claim 6, characterized in that: A limiting assembly (6) is provided at the bottom of the opposite side of the two arc-shaped boxes (502), and the limiting assembly (6) comprises a mounting block (601) fixed at the bottom of the opposite side of the two arc-shaped boxes (502), and the front and rear sides of the lower surface of the mounting block (601) are hingedly connected with a clamping ring (602), and a torsion spring (603) is provided at the top between the opposite sides of the two clamping rings (602), and a clamping rod (604) is fixed on the opposite side of the two clamping rings (602), and the outer surface of the threaded rod (503) is provided with a plurality of evenly distributed clamping grooves (605).

10. The piezoelectric acceleration and velocity composite sensor according to claim 9, characterized in that: The clamping slot (605) is located at the front side and the rear side of the clamping rod (604), and the inner diameter of the clamping slot (605) is matched with the outer diameter of the clamping rod (604).

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