Tooling for piezoelectric vibration sensor of plane shearing type

Abstract

The application relates to the tooling field of a piezoelectric vibration sensor, in particular to tooling applied to a planar shear type piezoelectric vibration sensor, which comprises a base, two pressing blocks and two hollow bolts; the base is provided with a first threaded through hole and a second threaded through hole, and the base between the first threaded through hole and the second threaded through hole is provided with a reference plane; the two pressing blocks are respectively located between the first threaded through hole and the second threaded through hole, the two pressing blocks respectively form positioning structures with the base, and the two pressing blocks respectively form sliding pairs with the base, any one of the pressing blocks respectively has a curved positioning surface and an installation through hole penetrating through the positioning surface, and the two positioning surfaces are arranged face to face. The positioning structure formed between the pressing blocks and the base prevents the rotation tendency of the counterweight block and the piezoelectric assembly, thereby solving the technical problem of how to avoid the rotation displacement of the counterweight block or the counterweight block and the piezoelectric assembly of the planar shear type piezoelectric vibration sensor during the assembling process.

Description

Technical Field

[0001] This invention relates to the field of tooling for piezoelectric vibration sensors, specifically to tooling for planar shear-type piezoelectric vibration sensors. Background Technology

[0002] Piezoelectric vibration sensors, compared to traditional magnetoelectric vibration sensors, offer advantages such as wide frequency response, high measurement range, high dynamic range, and superior temperature characteristics. Their lightweight nature and ability to withstand harsh environmental conditions have led to their rapid and widespread application in emerging or newly developed airborne applications. They have become a core component for vibration monitoring throughout the entire service life of aero-engines, serving as a crucial foundation for engine health assessment, fault prediction, and diagnosis. Piezoelectric vibration sensors generally include central compression structures, planar shear structures, and annular shear structures.

[0003] Planar shear piezoelectric vibration sensor, such as Figures 10 to 13 As shown, the piezoelectric vibration sensor has a base 005, a piezoelectric assembly 003, a counterweight 004, a bolt 001, and a nut 002. The base 005 is provided with a mounting block 006 and a positioning block 007. The mounting block is set on the positioning block, and the mounting block and the positioning block form a T-shape. At the same time, the mounting block is provided with mounting holes, which allows the piezoelectric assembly and the counterweight to be set on both sides of the mounting holes on the base, thus forming a symmetrical structure with double-sided counterweights. The piezoelectric assembly includes a piezoelectric crystal, an insulating sheet, and a connecting piece. The piezoelectric crystal, the insulating sheet, and the connecting piece are respectively manufactured as rectangles or rectangles with missing corners, so that the piezoelectric crystal, the insulating sheet, and the connecting piece can be arranged in a stacked manner. In addition, mounting holes are provided on the piezoelectric crystal, insulating sheet, and wiring piece; mounting holes are also provided on the counterweight. Bolts are used to penetrate the mounting holes of the counterweight, piezoelectric crystal, insulating sheet, wiring piece, and mounting block of the base, allowing the bolts to connect with nuts. The torque of the bolts and nuts is limited to a preset torque, thus assembling the planar shear piezoelectric vibration sensor. It should be noted that, to obtain lower transient temperature sensitivity and better temperature performance, neither the piezoelectric component nor the counterweight contacts the positioning block of the base; in other words, gaps are left between the piezoelectric component and the counterweight and the positioning block of the base.

[0004] If the planar shear piezoelectric vibration sensor described above is assembled manually with simple tools, when the operator tightens the bolt, the bolt head contacts the counterweight, and friction is generated between the bolt head and the counterweight. As the bolt rotates further, the counterweight, which is in contact with the bolt head, and the piezoelectric component, which is in contact with the counterweight, both tend to rotate under the influence of this friction. This results in rotational displacement of the counterweight or the counterweight and piezoelectric component during installation, leading to large dimensional and positional tolerances in the planar shear piezoelectric vibration sensor, as well as significant errors in important parameters such as the resonant frequency and frequency response.

[0005] Therefore, how to avoid the rotational displacement of the counterweight or the counterweight and piezoelectric components during the assembly process of the planar shear piezoelectric vibration sensor has become a technical problem to be solved. Summary of the Invention

[0006] To address the technical problem of avoiding rotational displacement of the counterweight or the counterweight and piezoelectric components during the assembly of planar shear-type piezoelectric vibration sensors, this invention provides tooling for planar shear-type piezoelectric vibration sensors.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] According to one aspect of the present invention, a tooling for a planar shear-type piezoelectric vibration sensor is provided, comprising a base, two pressure blocks and two hollow bolts;

[0009] The base is provided with a first threaded through hole and a second threaded through hole, with a gap between the first threaded through hole and the second threaded through hole, and the center line of the first threaded through hole and the center line of the second threaded through hole coincide. At least the base located between the first threaded through hole and the second threaded through hole is provided with a reference plane.

[0010] The two pressure blocks are respectively located between the first threaded through hole and the second threaded through hole. The two pressure blocks form a positioning structure with the base, and the two pressure blocks form a sliding pair with the base. Each pressure block has a curved positioning surface and a mounting through hole that penetrates the positioning surface. The two positioning surfaces are arranged face to face.

[0011] The first threaded through hole and the second threaded through hole are respectively threadedly connected to one of the hollow bolts, wherein the two hollow bolts are used to lock the two pressure blocks according to a preset torque, and the first threaded through hole and the second threaded through hole are respectively connected to one of the adjacent mounting through holes.

[0012] Furthermore, the base is provided with two positioning grooves, and the reference plane is the bottom surface of the two positioning grooves respectively. Each positioning groove has two planar side surfaces.

[0013] Each of the pressure blocks is provided with a positioning part, and each of the positioning parts is provided with a planar bottom plane and two planar side surfaces;

[0014] Any one of the positioning parts and one of the positioning grooves forms the positioning structure, and any one of the positioning parts and one of the positioning grooves forms the sliding pair, wherein the bottom plane of any one of the positioning parts is in surface-to-surface contact with the reference plane, and any side surface of any one of the positioning parts is in surface-to-surface contact with one of the groove side surfaces of one of the positioning grooves.

[0015] Furthermore, the positioning surface is a curved surface with a slight arc shape;

[0016] Alternatively, the positioning surface may be a semi-circular curved surface;

[0017] Alternatively, the positioning surface may be a semi-elliptical curved surface;

[0018] Alternatively, the positioning surface may be a curved surface that includes at least one plane.

[0019] Furthermore, it also includes pillars;

[0020] The support column is configured in a cylindrical shape;

[0021] The support column can be positioned between the two pressure blocks, and both ends of the support column can be inserted into the mounting through hole of one of the pressure blocks.

[0022] Furthermore, the cross-sectional profile of the mounting through hole is elliptical, or the cross-sectional profile of the mounting through hole is arc-shaped at both ends and parallel line-shaped in the middle.

[0023] Furthermore, it also includes thimbles;

[0024] The base is provided with a positioning through hole, which penetrates the reference plane. The center line of the positioning through hole is perpendicular to and intersects the center line of the first threaded through hole.

[0025] The ejector pin is configured to detachably penetrate the positioning through hole, wherein the ejector pin and the positioning through hole are in clearance fit.

[0026] Furthermore, it also includes two shaft cylinders;

[0027] Each of the shaft cylinders is provided with an axial channel, a support portion and a positioning portion, wherein the support portion and the positioning portion of any one of the shaft cylinders are fixed as one unit, and the support portion and the positioning portion are respectively penetrated by the axial channel along the axis of the shaft cylinder;

[0028] The support portion of any one of the shaft cylinders can be inserted into the hollow bolt, wherein the support portion and the hollow bolt form a clearance fit;

[0029] The positioning portion of any of the said shaft cylinders can contact the hollow bolt;

[0030] The support column can be inserted into the axial channel of any of the shaft cylinders, wherein the support column and the shaft cylinder form a clearance fit.

[0031] Furthermore, it also includes a mounting base;

[0032] The fixing seat is provided with a cover and two extensions, wherein the cover has a cover cavity, and at least the outline of the opening of the cover cavity matches the outline of the positioning surface;

[0033] The two extension portions are respectively fixedly connected to the cover portion, and the two extension portions are isolated by the cover portion;

[0034] The cover portion and the two extension portions are respectively provided with limiting through holes, wherein the limiting through holes of the two extension portions are configured to be positioned with the base by means of locating pins.

[0035] Furthermore, the base is provided with two limiting grooves and two limiting blind holes;

[0036] One of the limiting grooves is recessed in the base located at the first threaded through hole, and the other limiting groove is recessed in the base located at the second threaded through hole;

[0037] Each of the aforementioned limiting blind holes is recessed at the bottom of one of the limiting grooves, and the diameter of the limiting blind hole is smaller than the width of the limiting groove.

[0038] Any one of the extensions of the fixing seat can be engaged in one of the limiting grooves, wherein the limiting through hole on any one of the extensions can be positioned by a positioning pin and one of the limiting blind holes.

[0039] Furthermore, this also includes stop bars and torsion bars;

[0040] The stop rod is provided with at least a first cylindrical section and a first pawl, wherein one end of the first cylindrical section is provided with the first pawl, and the number of the first pawl is 2, 3 or 4;

[0041] The torsion bar is provided with at least a second cylindrical section and a second pawl, wherein one end of the second cylindrical section is provided with the second pawl, and the number of the second pawl is 2, 3 or 4;

[0042] The first cylindrical segment can be inserted into one of the hollow bolts, wherein the first cylindrical segment and the hollow bolt into which the first cylindrical segment is inserted are configured for a clearance fit;

[0043] The second cylindrical segment can be inserted into another of the hollow bolts, wherein the second cylindrical segment and the hollow bolt into which the second cylindrical segment is inserted are configured for a clearance fit. The above technical solution has the following advantages or beneficial effects:

[0044] The tooling provided by this invention for a planar shear-type piezoelectric vibration sensor locks two pressure blocks with two hollow bolts. The positioning structure formed between the pressure blocks and the base prevents the rotational tendency of the counterweight and the piezoelectric component, thereby solving the technical problem of how to avoid rotational displacement of the counterweight or the counterweight and the piezoelectric component during the assembly of the planar shear-type piezoelectric vibration sensor. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the split structure of the tooling for a planar shear-type piezoelectric vibration sensor provided in Embodiment 1 of the present invention;

[0046] Figure 2 This is a cross-sectional view of the base provided in Embodiment 1 of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of the base provided in Embodiment 1 of the present invention;

[0048] Figure 4 This is a cross-sectional view of the pressure block provided in Embodiment 1 of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of the pressure block provided in Embodiment 1 of the present invention;

[0050] Figure 6 This is a cross-sectional view of the shaft cylinder provided in Embodiment 1 of the present invention;

[0051] Figure 7 This is a schematic diagram of the stop rod provided in Embodiment 1 of the present invention;

[0052] Figure 8 This is a schematic diagram of the torsion bar provided in Embodiment 1 of the present invention;

[0053] Figure 9 This is a cross-sectional view of the fixing seat provided in Embodiment 1 of the present invention;

[0054] Figure 10 This is a schematic diagram of the planar shear piezoelectric vibration sensor provided in Embodiment 1 of the present invention;

[0055] Figure 11 This is a schematic diagram of the planar shear piezoelectric vibration sensor provided in Embodiment 1 of the present invention;

[0056] Figure 12 This is a schematic diagram of the planar shear piezoelectric vibration sensor provided in Embodiment 1 of the present invention;

[0057] Figure 13 This is a cross-sectional view of the planar shear piezoelectric vibration sensor provided in Embodiment 1 of the present invention. Detailed Implementation

[0058] Example 1:

[0059] In this embodiment, see Figures 1 to 5 A tooling for a planar shear-type piezoelectric vibration sensor is provided, comprising a base 5, two pressure blocks 7 and two hollow bolts 4;

[0060] The base 5 is provided with a first threaded through hole 501 and a second threaded through hole 502. There is a gap between the first threaded through hole 501 and the second threaded through hole 502, and the center line of the first threaded through hole 501 and the center line of the second threaded through hole 502 coincide. At least the base 5 located between the first threaded through hole 501 and the second threaded through hole 502 is provided with a reference plane 503.

[0061] Two pressure blocks 7 are respectively located between the first threaded through hole 501 and the second threaded through hole 502. The two pressure blocks 7 form a positioning structure with the base 5, and the two pressure blocks 7 form a sliding pair with the base 5. Each pressure block 7 has a curved positioning surface 701 and a mounting through hole 702 that at least penetrates the positioning surface 701. The two positioning surfaces 701 are arranged face to face.

[0062] The first threaded through hole 501 and the second threaded through hole 502 are respectively threaded to one of the hollow bolts 4. The two hollow bolts 4 are used to lock the two pressure blocks 7 according to a preset torque. The first threaded through hole 501 and the second threaded through hole 502 are respectively connected to one of the adjacent mounting through holes 702.

[0063] The tooling used in this embodiment for a planar shear-type piezoelectric vibration sensor is used to assemble the planar shear-type piezoelectric vibration sensor (see [reference]). Figure 1 , Figure 1 Number 11 in the reference refers to this planar shear piezoelectric vibration sensor, or see [link to reference]. Figures 10 to 13During the process, the base 005, two sets of piezoelectric components 003, and two counterweights 004 are respectively brought into contact with the reference plane 503 of the base 5. The mounting block 006 of the base 005 is located between the positioning block 007 and the reference plane 503. With the mounting block 006 as the center, the two sets of piezoelectric components 003 are located on both sides of the mounting block 006, and the two counterweights 004 are located on both sides of the mounting block 006. Each set of piezoelectric components 003 is located between one of the counterweights 004 and the mounting block 006. At this time, the edges of the piezoelectric crystal, insulating sheet, and connecting piece of the piezoelectric component 003 are in contact with the reference plane 503, as are the counterweights 004 and the mounting block. Thus, the base 005, piezoelectric components 003, and counterweights 004 of the sensor are aligned with each other through the reference plane 503.

[0064] Along the direction parallel to the base plane 503, the operator drives the two pressure blocks 7 to approach and contact the two counterweight blocks 004 of the sensor, so that the curved positioning surface 701 on the first pressure block 7 is tightly attached to the surface of the first counterweight block 004, and so that the curved positioning surface 701 on the second pressure block 7 is tightly attached to the surface of the second counterweight block 004.

[0065] After the two pressure blocks 7 contact the two counterweights 004 respectively, the two hollow bolts 4 are respectively placed in the first threaded through hole 501 and the second threaded through hole 502 of the base 5; the two hollow bolts 4 contact one of the pressure blocks 7 respectively. At this time, the two hollow bolts 4 clamp or temporarily clamp the two pressure blocks 7, so that the two pressure blocks 7 clamp or temporarily clamp the two counterweights 004, the two sets of piezoelectric components 003 and the base 005.

[0066] The bolt 001 and nut 002 of the sensor are respectively set in one of the counterweights 004. Specifically, the two counterweights 004 of the sensor are respectively provided with mounting grooves. The mounting groove of one counterweight 004 is used to accommodate the nut, and the mounting groove is coaxial and connected with the mounting hole of the counterweight 004. The mounting groove of the other counterweight 004 is used to accommodate the head of the bolt. The mounting holes of the two counterweights 004 and the mounting holes of the two sets of piezoelectric components 003 together accommodate the bolt shank. It should be understood that the specific method of setting the bolt 001 and nut 002 in the counterweights 004 will be described in detail later and will not be mentioned here.

[0067] A stop tool and a turning tool are respectively inserted into one of the hollow bolts 4; the stop tool penetrates the mounting through hole 702 of the first hollow bolt 4 and the first pressure block 7 to contact the nut, and the turning tool penetrates the mounting through hole 702 of the second hollow bolt 4 and the second pressure block 7 to contact the bolt; the worker uses the stop tool to fix the nut, and the worker uses the turning tool to tighten the bolt, so that the bolt and nut are connected; it should be understood that the specific structure of the stop tool and the turning tool will be described in detail later, and will not be mentioned here;

[0068] As workers tighten bolts and nuts using stop and twisting tools, the bolts gradually approach and contact the counterweight 004. At this point, the bolt head generates friction with the counterweight 004, causing the counterweight 004 to rotate under the influence of friction.

[0069] The counterweight 004 and the curved positioning surface 701 of the pressure block 7 form a surface-to-surface contact. When the counterweight 004 has a rotational tendency, the pressure block 7 also has a rotational tendency due to the friction between the counterweight 004 and the pressure block 7.

[0070] Because the pressure block 7 and the base 5 form a positioning structure and a sliding pair, and because the two hollow bolts 4 lock the two pressure blocks 7, the pressure block 7, which has a tendency to rotate, cannot slide or rotate relative to the base 5 at this moment. In other words, because the positioning structure formed between the base 5 and the pressure block 7 prevents the pressure block 7 from rotating, the pressure block 7 prevents the counterweight 004 from rotating through the friction between the pressure block 7 and the counterweight 004. Consequently, when the rotation tendency of the counterweight 004 is prevented, the rotation tendency of the piezoelectric component 003 in contact with the counterweight 004 is also prevented. Ultimately, the piezoelectric component 003 and the counterweight 004 cannot actually rotate.

[0071] Therefore, the tooling provided in this embodiment for a planar shear-type piezoelectric vibration sensor locks two pressure blocks 7 with two hollow bolts 4. The positioning structure formed between the pressure block 7 and the base 5 prevents the rotational tendency of the counterweight 004 and the piezoelectric component 003, thereby solving the technical problem of how to avoid the rotational displacement of the counterweight 004 or the counterweight 004 and the piezoelectric component 003 during the assembly of the planar shear-type piezoelectric vibration sensor.

[0072] Further, see Figures 1 to 5In this embodiment, the tooling for the planar shear type piezoelectric vibration sensor has a base 5 with two positioning grooves 504. The reference plane 503 is the bottom surface B of the two positioning grooves 504 respectively. Each positioning groove 504 has two planar side surfaces A.

[0073] Each of the pressure blocks 7 is provided with a positioning part 703, and each positioning part 703 is provided with a planar bottom plane C and two planar side surfaces D;

[0074] Any one of the positioning parts 703 and one of the positioning grooves 504 form a positioning structure, and any one of the positioning parts 703 and one of the positioning grooves 504 form a sliding pair. The bottom plane C of any one of the positioning parts 703 is in surface-to-surface contact with the reference plane 503, and any one of the side surfaces D of any one of the positioning parts 703 is in surface-to-surface contact with one of the groove side surfaces A of one of the positioning grooves 504.

[0075] When the pressure block 7 tends to rotate, the three surface-to-surface contact structures formed between the bottom plane C of the positioning part 703 of the pressure block 7 and the reference plane 503 of the base 5, the first side surface D of the positioning part 703 of the pressure block 7 and the first groove side surface A of the positioning groove 504, and the second side surface D of the positioning part 703 of the pressure block 7 and the second groove side surface A of the positioning groove 504 together prevent the pressure block 7 from rotating, thereby forming a positioning structure between the positioning part 703 of the pressure block 7 and the positioning groove 504 of the base 5.

[0076] It should be understood that in other embodiments, other structures can also be used to form a positioning structure between the pressure block 7 and the base 5. For example, a sliding groove is provided on the base 5, and a sliding block is provided on the pressure block 7. The sliding block is placed in the sliding groove to form a positioning structure.

[0077] Further, see Figure 1 , Figure 4 or Figure 5 In this embodiment, the tooling for the planar shear type piezoelectric vibration sensor has a positioning surface 701 on the pressure block 7, the shape of which should be specifically set according to the shape of the counterweight block 004.

[0078] See Figures 10 to 13The figure shows the structure of the sensor. It can be observed that the counterweight 004 has an arc surface. Correspondingly, the positioning surface 701 on the pressure block 7 should be set as an arc surface. More specifically, the positioning surface 701 should be set as a minor arc shape. The reason is that when the pressure block 7 slides towards the counterweight 004, the positioning surface 701 of the pressure block 7 can contact the arc surface of the counterweight 004. If the positioning surface 701 is configured as a major arc shape, then the positioning surface 701 of the pressure block 7 and the arc surface of the counterweight 004 cannot form a surface-to-surface contact.

[0079] Similarly, assuming that the counterweight 004 has a semi-circular curved surface, the positioning surface 701 of the pressure block 7 can be configured as a slightly curved surface or as a semi-circular curved surface.

[0080] Similarly, assuming that the counterweight 004 has a semi-elliptical curved surface, the positioning surface 701 of the pressure block 7 can be configured as a minor arc curved surface or as a semi-elliptical curved surface.

[0081] It should be understood that a slightly curved surface refers to the intersection line where the curved surface intersects with the bottom plane of the pressure block 7, which is slightly curved.

[0082] In addition to setting the counterweight 004 to have an arc surface, in the specific design and manufacturing of the sensor, the counterweight 004 may be designed to have a curved surface with a plane. For example, two arc surfaces are set at both ends and the plane is set in the middle, with one side of each arc surface connected to the plane. Correspondingly, the positioning surface 701 of the pressure block 7 is designed to have two arc surfaces and one plane, with the two arc surfaces set at both ends and the plane set in the middle.

[0083] It is also possible to design a curved surface with two planes. For example, the two planes are set at an obtuse angle, a right angle, or an acute angle. Correspondingly, the positioning surface 701 of the pressure block 7 is designed as two planes, which are set at an obtuse angle, a right angle, or an acute angle. Another example is to set two planes at both ends and an arc surface in the middle, with each plane connected to the arc surface by one side. Correspondingly, the positioning surface 701 of the pressure block 7 is designed as two planes and one arc surface, with the two planes at both ends and an arc surface in the middle, with each plane connected to the arc surface by one side.

[0084] It is also possible to design a curved surface with three planes. For example, the three planes are connected in sequence, and the planes at both ends are set at obtuse angles or right angles with the plane in the middle. Correspondingly, the positioning surface 701 of the pressure block 7 is provided with three planes, and the three planes are connected in sequence, with the planes at both ends being set at diagonal angles or right angles with the plane in the middle.

[0085] Further, see Figure 1The tooling for the planar shear type piezoelectric vibration sensor in this embodiment also includes a support column 2;

[0086] Support 2 is configured as a cylinder;

[0087] The support column 2 can be positioned between two pressure blocks 7, and both ends of the support column 2 can be inserted into the mounting through hole 702 of one of the pressure blocks 7 respectively.

[0088] As mentioned above, the sensor needs to be temporarily fixed before it is actually installed on the base 5; in this embodiment, the temporary fixing is achieved by using the support column 2.

[0089] Specifically, during actual sensor assembly, the base 005, piezoelectric component 003, and counterweight 004 are temporarily fixed symmetrically using the support column 2. In other words, with the mounting block of the base 005 as the center, two piezoelectric components 003 and two counterweights 004 are respectively positioned on either side of the mounting hole of the mounting block. The mounting block is located between the two piezoelectric components 003, and the two piezoelectric components 003 are located between the two counterweights 004. The cylindrical support column 2 penetrates the mounting holes of the mounting block, the two piezoelectric components 003, and the two counterweights 004, respectively, allowing the support column 2 to form a clearance fit with any one of the mounting holes, thus achieving temporary fixation.

[0090] After the temporary fixed sensor is set on the base 5, the operator manipulates the support column 2 and the two pressure blocks 7 so that one end of the support column 2 is inserted into the mounting through hole 702 of one of the pressure blocks 7, and the other end of the support column 2 is inserted into the mounting through hole 702 of the other pressure block 7.

[0091] After the two hollow bolts 4 lock the two pressure blocks 7, the sensor is fixed by the base 5, the two pressure blocks 7 and the two hollow bolts 4. At this time, the staff can remove the support column 2 from the mounting through hole 702 of the pressure block 7 on either side of the sensor and the hollow bolt 4.

[0092] Furthermore, since the pressure block 7 and the base 5 form a sliding pair, after the sensor, which is temporarily fixed by the support column 2, is actually placed on the base, the sensor has an adjustable space relative to the base. This allows the workers assembling the sensor to have a larger field of vision and adjustment space. Within this larger field of vision, the workers can use the adjustable space to distribute the counterweight 004 and the piezoelectric component 003 along the length of the support column. After dispersing them, the workers can rearrange the counterweight 004 and the piezoelectric component 003 so that the wires of the connecting pieces in the piezoelectric component 003 are not clamped or blocked. This allows the workers to adjust the wires of the connecting pieces to the circuit position required by the design.

[0093] Further, see Figure 4 or Figure 5 In this embodiment, the tooling for a planar shear-type piezoelectric vibration sensor has an elliptical profile in the cross-section of the mounting through hole 702, or the cross-section of the mounting through hole 702 has rounded ends and a parallel line in the middle.

[0094] As mentioned above, during the process of inserting the support column 2 into the mounting through hole 702 of the pressure block 7, if the mounting through hole 702 is set as a circular through hole, resulting in a gap configuration between the mounting through hole 702 and the support column 2, then during the process of inserting the support column 2 into the mounting through hole 702 of the pressure block 7, because the gap between the support column 2 and the mounting through hole 702 is relatively small, the support column 2 is not easy to be inserted into the mounting through hole 702.

[0095] Therefore, the outline of the mounting through hole 702 of the pressure block 7 is set to an ellipse, or to be rounded at both ends and parallel in the middle. The purpose is to increase the gap between the support column 2 and the mounting through hole 702, so as to facilitate the insertion of the support column 2 into the mounting through hole 702, thereby improving the efficiency of inserting the support column 2 into the mounting through hole 702.

[0096] Further, see Figure 1 The tooling for the planar shear type piezoelectric vibration sensor in this embodiment also includes a ejector pin 10;

[0097] The base 5 is provided with a positioning through hole 505, which penetrates the reference plane 503. The center line of the positioning through hole 505 is perpendicular to and intersects the center line of the first threaded through hole 501.

[0098] The ejector pin 10 is configured as a removable through-positioning through-hole 505, wherein the ejector pin 10 and the positioning through-hole 505 are in clearance fit.

[0099] As described above, the sensor is temporarily fixed on the base 5, and its position relative to the base 5 is not fixed before the two hollow bolts 4 are tightened. This causes the sensor to shift relative to the base 5 during the insertion of the aforementioned support 2 into the pressure block 7, or during the tightening of the two pressure blocks 7 by the two hollow bolts 4. As a result, the operator must use one hand to fix the sensor relatively on the base 5, and the other hand to operate the pressure block 7 or the support 2, thereby reducing the efficiency of inserting the support 2 into the pressure block 7. If the operator uses both hands to operate the pressure block 7 or the support 2, after the sensor or one of its components shifts, the operator needs to readjust the position of the sensor or one of its components, thereby reducing the overall efficiency of assembling the sensor.

[0100] In this embodiment, a push pin 10 is used at the positioning through hole 505 of the base 5, so that after the push pin 10 penetrates the positioning through hole 505, the temporarily fixed sensor can be temporarily fixed relative to the base 5 through the push pin 10. It should be understood that, in order to cooperate with the push pin 10 to achieve the second temporary fixation, a positioning hole 008 should be provided on the mounting block 007 of the sensor base 005 (see Figure 12 or Figure 13 The positioning hole 008 is recessed along the direction from the mounting block 006 to the positioning block 007, so that the pin 10 can be inserted into the positioning hole 008 to form a second temporary fixation of the sensor.

[0101] The sensor is mounted on the base 5 via the pin 10, so that the sensor base 005 cannot be displaced relative to the base 5. Based on this, when the operator inserts the support column 2 into the mounting through hole 702 of the pressure block 7, one hand can operate the pressure block 7 and the other hand can operate the support column 2, thereby improving the efficiency of inserting the support column 2 into the pressure block 7.

[0102] Further, see Figure 1 or Figure 6 The tooling for the planar shear-type piezoelectric vibration sensor in this embodiment also includes two shaft cylinders 3;

[0103] Each shaft cylinder 3 is provided with an axial channel 301, a support part 302 and a limiting part 303. The support part 302 and the limiting part 303 of each shaft cylinder 3 are fixed as one unit. Along the axis of the shaft cylinder 3, the support part 302 and the limiting part 303 are respectively penetrated by the axial channel 301.

[0104] The support portion 302 of any one of the shaft cylinders 3 can be inserted into the hollow bolt 4, wherein the support portion 302 and the hollow bolt 4 form a clearance fit;

[0105] The limiting part 303 of any shaft cylinder 3 can contact the hollow bolt 4;

[0106] The support column 2 can be inserted into the axial channel 301 of any of the shaft cylinders 3, wherein the support column 2 and the shaft cylinder 3 form a clearance fit.

[0107] In the aforementioned content, after the sensor is set on the base 5 by the ejector pin 10 and during the process of clamping the two pressure blocks 7 by the two hollow bolts 4, the support column 2 forms a clearance fit with the sensor and the two pressure blocks 7 respectively, which may cause the sensor to rotate around the ejector pin 10, thereby reducing the assembly accuracy.

[0108] In this embodiment, two shaft cylinders 3 are used in conjunction with two hollow bolts 4 and a support column 2. During the process of inserting the two shaft cylinders 3 into one of the hollow bolts 4 and inserting both ends of the support column 2 into one of the shaft cylinders 3, if the sensor has already undergone rotational displacement around the ejector pin 10, it will inevitably result in at least one end of the support column 2 not being able to be inserted into one of the shaft cylinders 3, or it will inevitably result in at least one shaft cylinder 3 not being able to be inserted into one of the hollow bolts 4. In other words, if the two shaft cylinders 3 have already been inserted into one of the hollow bolts 4 and both ends of the support column 2 have already been inserted into one of the shaft cylinders 3, this means that the rotational displacement of the sensor that had already occurred has disappeared, the current position of the sensor has been corrected, thereby improving the assembly accuracy of the sensor.

[0109] Further, see Figure 1 or Figure 9 The tooling for the planar shear type piezoelectric vibration sensor in this embodiment also includes a fixed base 12;

[0110] The fixing seat 12 is provided with a cover portion 121 and two extension portions 122, wherein the cover portion 121 has a cover cavity 123, and at least the outline of the opening of the cover cavity 123 matches the outline of the positioning surface 701.

[0111] Two extensions 122 are fixedly connected to the cover 121, and the two extensions 122 are isolated by the cover 121;

[0112] The cover portion 121 and the two extension portions 122 are respectively provided with limiting through holes 124, wherein the limiting through holes 124 of the two extension portions 122 are configured to be positioned with the base 5 by means of locating pins.

[0113] As mentioned above, after the ejector pin 10 is placed on the base 5, the positioning accuracy of the ejector pin 10 relative to the fixed base 12 is relatively low because the ejector pin 10 and the positioning through hole 505 of the base 5 are in clearance fit. Therefore, when the sensor is placed on the base 5 through the ejector pin 10, the positioning accuracy of the sensor relative to the base 5 is reduced.

[0114] In this embodiment, a fixed base 12 is used in conjunction with a ejector pin 10 to improve the positioning accuracy of the ejector pin 10 relative to the base 5. Specifically, after the sensor is set on the base 5 by the ejector pin 10, the fixed base 12 is covered on the base 5 and the sensor. The two extensions 122 of the fixed base 12 respectively contact the base 5, and the limiting through holes 124 on the two extensions 122 are respectively positioned with the base 5 by positioning pins. The cover part 121 of the fixed base 12 covers the positioning block 007 of the sensor, and the limiting through holes 124 of the cover part 121 are positioned with the positioning block 007 of the sensor by positioning pins.

[0115] Corresponding to the mounting base 12, the sensor's positioning block is provided with positioning holes for the insertion of positioning pins.

[0116] Corresponding to the fixed base 12, the base 5 located at the first threaded through hole 501 and the second threaded through hole 502 is respectively provided with positioning holes for the insertion of positioning pins.

[0117] By using the fixed base 12 in conjunction with the ejector pin 10, the positioning accuracy of the ejector pin 10 relative to the base 5 is improved, thereby improving the positioning accuracy of the sensor set on the base 5 by the ejector pin 10.

[0118] Furthermore, the sensor mentioned in this embodiment has two piezoelectric components 003 and two counterweights 004, and the sensor forms a symmetrical structure centered on the mounting block. This structure is called a double-sided shear structure.

[0119] The tooling used in this embodiment for a planar shear-type piezoelectric vibration sensor can also be used to assemble a single-sided shear structure piezoelectric vibration sensor. The single-sided shear structure piezoelectric vibration sensor has a base 005, a piezoelectric component 003, and a counterweight 004. The piezoelectric component 003 is confined between the base 005 and the counterweight 004. Thus, in the actual assembly of the single-sided shear structure piezoelectric vibration sensor using the tooling in this embodiment, only one pressure block 7 can contact the counterweight 004. A hollow bolt 4 applies force to this pressure block 7, while the fixing seat 12 and the ejector pin 10 work together to apply force to the base 005 of the single-sided shear structure piezoelectric vibration sensor, thereby creating the effect of two forces locking the pressure block 7.

[0120] Further, see Figures 1 to 3 In this embodiment, the tooling for the planar shear type piezoelectric vibration sensor has two limiting grooves 506 and two limiting blind holes 507 on the base 5.

[0121] One of the limiting grooves 506 is recessed in the base 5 located at the first threaded through hole 501, and the other limiting groove 506 is recessed in the base 5 located at the second threaded through hole 502;

[0122] Each of the limiting blind holes 507 is recessed into the bottom of one of the limiting grooves 506, and the diameter of the limiting blind hole 507 is smaller than the width of the limiting groove 506.

[0123] Any extension 122 of the fixed base 12 can be engaged in one of the limiting grooves 506, wherein the limiting through hole 124 on any extension 122 can be positioned with one of the limiting blind holes 507 by a positioning pin.

[0124] The two limiting grooves 506 are respectively located on the base 5 at the first threaded through hole 501 or on the base 5 at the second threaded through hole 502, and the first threaded through hole 501 is restricted between one of the limiting grooves 506 and the reference plane 503, and the second threaded through hole 502 is restricted between the other limiting groove 506 and the reference plane 503.

[0125] One of the limiting blind holes 507 is configured to be recessed along the bottom of the first limiting groove 506 toward the reference plane 503, and the other limiting groove 506 is configured to be recessed along the bottom of the second limiting groove 506 toward the reference plane 503.

[0126] The two extensions 122 of the fixed base 12 are first set in the two limiting grooves 506, so that the fixed base 12 is temporarily positioned relative to the base 5. Then, the positioning pins are inserted into the limiting through hole 124 of the fixed base 12 and the limiting blind hole 507 of the base 5 respectively, thereby forming the positioning of the fixed base 12 and the base 5.

[0127] After the cover portion 121 of the fixing base 12 covers the sensor, the positioning pins are inserted into the limiting through hole 124 of the cover portion 121 and the positioning hole 008 on the positioning block of the sensor, thereby forming the positioning of the fixing base 12, the ejector pin 10 and the sensor.

[0128] Further, see Figure 1 , Figure 7 or Figure 8 The tooling for the planar shear type piezoelectric vibration sensor in this embodiment also includes a stop rod 1 and a torsion bar 9;

[0129] The stop rod 1 is provided with at least a first cylindrical section 101 and a first pawl 102, wherein one end of the first cylindrical section 101 is provided with a first pawl 102, and the number of first pawls 102 is 2, 3 or 4.

[0130] The torsion bar 9 is provided with at least a second cylindrical section 901 and a second pawl 902, wherein one end of the second cylindrical section 901 is provided with a second pawl 902, and the number of second pawls 902 is 2, 3 or 4;

[0131] The first cylindrical section 101 can be inserted into one of the hollow bolts 4, wherein the first cylindrical section 101 and the hollow bolt 4 into which the first cylindrical section 101 is inserted are configured for clearance fit;

[0132] The second cylindrical section 901 can be inserted into another hollow bolt 4, wherein the second cylindrical section 901 and the hollow bolt 4 into which the second cylindrical section 901 is inserted are configured for clearance fit.

[0133] Stop bar 1 is the stop tool mentioned above, and torsion bar 9 is the torsion tool mentioned above.

[0134] It should be understood that, in order to reduce the weight of the sensor, the sensor mentioned in this embodiment is provided with receiving grooves on the two fixing blocks 004 respectively. The receiving grooves are set as circular grooves. Correspondingly, the bolt 001 and nut 002 of the sensor mentioned above are respectively manufactured as cylindrical. That is, the head of the bolt is set as cylindrical and a locking hole is provided on the end face of the head. The nut is set as cylindrical and a locking hole is provided on the end face of the nut.

[0135] In this embodiment, the number of first claws 102 on the stop rod 1 is the same as the number of locking holes in the sensor nut, or the number of first claws 102 on the stop rod 1 is less than the number of locking holes in the sensor nut; for example, if the sensor nut has 2, 3, or 4 locking holes, the corresponding number of first claws 102 on the stop rod 1 is 2, 3, or 4; or if the sensor nut has 4 locking holes, the corresponding number of first claws 102 on the stop rod 1 is 2 or 4.

[0136] In this embodiment, the number of second claws 902 on the torsion bar 9 is the same as the number of locking holes of the sensor bolt, or the number of second claws 902 on the torsion bar 9 is less than the number of locking holes of the sensor bolt; for example, if the sensor bolt has 2, 3, or 4 locking holes, the corresponding number of second claws 902 on the torsion bar 9 is 2, 3, or 4; or if the sensor bolt has 4 locking holes, the corresponding number of second claws 902 on the torsion bar 9 is 2 or 4.

[0137] In the aforementioned process, after the sensor is mounted on the base 5 and the shaft cylinder 3 and support column 2 are removed, the bolt and nut can be connected by the torsion bar 9 and the stop bar 1. Specifically, at the hollow bolt 4 on the side of bolt 001, the second cylindrical section 901 and the second claw 902 of the torsion bar 9 are inserted into the hollow bolt 4 and then further inserted into the mounting through hole 702 of the pressure block 7 until the second claw 902 of the torsion bar 9 is engaged in the bolt's locking hole. At the same time, at the hollow bolt 4 on the side of nut 002, the first cylindrical section 101 and the first claw 102 of the stop bar 1 are inserted into the hollow bolt 4 and then further inserted into the mounting through hole 702 of the pressure block 7 until the first claw 102 of the stop bar 1 is engaged in the locking hole of the nut 002. The stop bar 1 is fixed by the operator, while the torsion bar 9 is twisted by the operator. The torsion bar 9 drives the bolt to rotate, thus connecting bolt 001 and nut 002.

[0138] Based on the foregoing, the tooling used in this embodiment for a planar shear-type piezoelectric vibration sensor involves the following specific assembly steps:

[0139] The support column 2 penetrates the sensor base 005, two piezoelectric components 003 and two counterweights 004 respectively, so that a piezoelectric component 003 and a counterweight 004 are respectively set on both sides of the mounting block of the base 005, and the piezoelectric component 003 is confined between the base 005 and the counterweight 004.

[0140] The sensor mounting block 006, the two piezoelectric components 003 and the two counterweights 004 are brought into contact with the reference plane 503 of the base 5, so that the mounting block, the two piezoelectric components 003 and the two counterweights 004 are positioned relative to the reference plane 503. At the same time, the pin 10 set on the base 5 is inserted into the positioning hole of the mounting block 006.

[0141] Assemble the pressure block 7 and the support column 2. The worker drives the support column 2 to move towards the first threaded through hole 501, increasing the gap between the support column 2 and the second threaded through hole 502. Then, the first pressure block 7 is placed between the support column 2 and the second threaded through hole 502. After that, the worker drives the support column 2 to move towards the second threaded through hole 502, so that the support column 2 is inserted into the mounting through hole 702 of the first pressure block 7. At the same time, the distance between the support column 2 and the first threaded through hole 501 increases. The worker places the second pressure block 7 between the support column 2 and the first threaded through hole 501. Then, the worker drives the support column 2 to move towards the first threaded through hole 501 until the support column 2 is inserted into the second pressure block 7. At this point, the two ends of the support column 2 are respectively located in the two pressure blocks 7.

[0142] Install two hollow bolts 4 and screw them into contact with the pressure block 7 until the two hollow bolts 4 clamp the two pressure blocks 7, but do not tighten them. At this time, the two pressure blocks 7 clamp the two counterweight blocks 004 of the sensor.

[0143] Install two shaft cylinders 3, and insert each of the two shaft cylinders 3 into one of the hollow bolts 4, so that the shaft cylinder 3 and the hollow bolt 4 form a clearance fit. At the same time, one end of the shaft cylinder 3 is inserted into the support column 2, so that the shaft cylinder 3 and the support column 2 form a clearance fit.

[0144] After the two shaft cylinders 3 form a clearance fit with the support column 2, continue to tighten the two hollow bolts 4 to make the two hollow bolts 4 tight;

[0145] After tightening the two hollow bolts 4, remove the two shaft cylinders 3 and the support column 2; at this time, the sensor is fixed to the base 5 by the two pressure blocks 7 and the two hollow bolts 4.

[0146] Insert a bolt and a nut, wherein the bolt can be inserted into a hollow bolt 4 located in the first threaded through hole 501, and the nut can be inserted into a hollow bolt 4 located in the second threaded through hole 502;

[0147] Mounting bracket 12, fixing bracket 12 and base 5 with positioning pins, and fixing bracket 12 and sensor positioning block 007 with positioning pins;

[0148] Bolt 001 and nut 002 are installed using a stop rod 1 and a torsion bar 9. First, the stop rod 1 pushes the nut so that it passes through the hollow bolt 4 and the pressure block 7 in sequence and reaches the mounting groove of one of the counterweights 004. Then, the torsion bar 9 pushes the bolt 001 so that it passes through the hollow bolt 4 and the pressure block 7 in sequence and reaches the mounting groove of the other counterweight 004. The claws of the stop rod 1 engage in the slots of the nut 002, and the claws of the torsion bar 9 engage in the slots of the bolt. Afterward, the operator keeps the stop rod 1 relatively stationary and drives the torsion bar 9 to rotate according to a preset torque, so that the bolt 001 and nut 002 are connected and tightened.

[0149] After tightening bolt 001 and nut 002, remove stop bar 1 and torsion bar 9;

[0150] After removing the stop bar 1 and the torsion bar 9, remove the two hollow bolts 4;

[0151] After removing the two hollow bolts 4, remove the fixing seat 12 and the positioning pin, so that the worker can separate the assembled sensor from the base 5.

[0152] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tooling for a planar shear-type piezoelectric vibration sensor, characterized in that, Includes a base, two pressure blocks, and two hollow bolts; The base is provided with a first threaded through hole and a second threaded through hole, with a gap between the first threaded through hole and the second threaded through hole, and the center line of the first threaded through hole and the center line of the second threaded through hole coincide. At least the base located between the first threaded through hole and the second threaded through hole is provided with a reference plane. The two pressure blocks are respectively located between the first threaded through hole and the second threaded through hole. The two pressure blocks form a positioning structure with the base, and the two pressure blocks form a sliding pair with the base. Each pressure block has a curved positioning surface and a mounting through hole that penetrates the positioning surface. The two positioning surfaces are arranged face to face. The first threaded through hole and the second threaded through hole are respectively threadedly connected to one of the hollow bolts, wherein the two hollow bolts are used to lock the two pressure blocks according to a preset torque, and the first threaded through hole and the second threaded through hole are respectively connected to one of the adjacent mounting through holes; The base is provided with two positioning grooves, and the reference plane is the bottom surface of the two positioning grooves respectively. Each positioning groove has two planar side surfaces. Each of the pressure blocks is provided with a positioning part, and each of the positioning parts is provided with a planar bottom plane and two planar side surfaces; Any one of the positioning parts and one of the positioning grooves forms the positioning structure, and any one of the positioning parts and one of the positioning grooves forms the sliding pair, wherein the bottom plane of any one of the positioning parts is in surface-to-surface contact with the reference plane, and any side surface of any one of the positioning parts is in surface-to-surface contact with one of the groove side surfaces of one of the positioning grooves. It also includes pillars; The support column is configured in a cylindrical shape; The support column can be disposed between the two pressure blocks, and both ends of the support column can be inserted into the mounting through hole of one of the pressure blocks respectively; It also includes thimbles; The base is provided with a positioning through hole, which penetrates the reference plane. The center line of the positioning through hole is perpendicular to and intersects the center line of the first threaded through hole. The ejector pin is configured to detachably penetrate the positioning through hole, wherein the ejector pin and the positioning through hole are in clearance fit; It also includes a mounting base; The fixing seat is provided with a cover and two extensions, wherein the cover has a cover cavity, and at least the outline of the opening of the cover cavity matches the outline of the positioning surface; The two extension portions are respectively fixedly connected to the cover portion, and the two extension portions are isolated by the cover portion; The cover portion and the two extension portions are respectively provided with limiting through holes, wherein the limiting through holes of the two extension portions are configured to be positioned with the base by means of locating pins.

2. The tooling for a planar shear-type piezoelectric vibration sensor according to claim 1, characterized in that, The positioning surface is a curved surface with a slight arc shape; Alternatively, the positioning surface may be a semi-circular curved surface; Alternatively, the positioning surface may be a semi-elliptical curved surface; Alternatively, the positioning surface may be a curved surface that includes at least one plane.

3. The tooling for a planar shear-type piezoelectric vibration sensor according to claim 1, characterized in that, The cross-sectional profile of the mounting through hole is elliptical, or the cross-sectional profile of the mounting through hole is arc-shaped at both ends and parallel line in the middle.

4. The tooling for a planar shear-type piezoelectric vibration sensor according to claim 1, characterized in that, It also includes two shaft cylinders; Each of the shaft cylinders is provided with an axial channel, a support portion and a positioning portion, wherein the support portion and the positioning portion of any one of the shaft cylinders are fixed as one unit, and the support portion and the positioning portion are respectively penetrated by the axial channel along the axis of the shaft cylinder; The support portion of any one of the shaft cylinders can be inserted into the hollow bolt, wherein the support portion and the hollow bolt form a clearance fit; The positioning portion of any of the said shaft cylinders can contact the hollow bolt; The support column can be inserted into the axial channel of any of the shaft cylinders, wherein the support column and the shaft cylinder form a clearance fit.

5. The tooling for a planar shear-type piezoelectric vibration sensor according to claim 1, characterized in that, The base is provided with two limiting grooves and two limiting blind holes; One of the limiting grooves is recessed in the base located at the first threaded through hole, and the other limiting groove is recessed in the base located at the second threaded through hole; Each of the aforementioned limiting blind holes is recessed at the bottom of one of the limiting grooves, and the diameter of the limiting blind hole is smaller than the width of the limiting groove. Any one of the extensions of the fixing base can be engaged in one of the limiting grooves, wherein the limiting through hole on any one of the extensions can be positioned by a positioning pin and one of the limiting blind holes.

6. The tooling for a planar shear-type piezoelectric vibration sensor according to claim 1, characterized in that, It also includes stop bars and torsion bars; The stop rod is provided with at least a first cylindrical section and a first pawl, wherein one end of the first cylindrical section is provided with the first pawl, and the number of the first pawl is 2, 3 or 4; The torsion bar is provided with at least a second cylindrical section and a second pawl, wherein one end of the second cylindrical section is provided with the second pawl, and the number of the second pawl is 2, 3 or 4; The first cylindrical segment can be inserted into one of the hollow bolts, wherein the first cylindrical segment and the hollow bolt into which the first cylindrical segment is inserted are configured for a clearance fit; The second cylindrical segment can be inserted into another of the hollow bolts, wherein the second cylindrical segment and the hollow bolt into which the second cylindrical segment is inserted are configured for a clearance fit.

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