Pre-tightening welding device for annular piezoelectric force sensor
Through the pre-tightening welding device of components such as the base and axial pressure rod, the problem of damage caused by device rotation during the pre-tightening process of the annular piezoelectric force sensor is solved, and stable assembly and efficient welding of the sensor are achieved.
Patent Information
- Application Number
- CN202422809418.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The existing technology lacks a reasonable welding device, which causes the annular piezoelectric force sensor to rotate during the pre-tightening process, causing damage to the sensor's appearance and internal sensitive components.
A pre-tightening welding device including a base, an axial pressure rod, a positioning caliper, a positioning pin, a fastening nut and a fastening gasket is used to prevent the device from rotating through the axial pressing force, thereby achieving stable assembly and welding of the sensor.
It effectively avoids damage to the sensor appearance and internal sensitive components during the pre-tightening process, and achieves low-risk, low-damage and high-efficiency sensor assembly.
Smart Images
Figure CN223418639U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a pre-tightening welding device for an annular piezoelectric force sensor, belonging to the technical field of sensors. Background Art
[0002] Pre-tightening the entire sensor is a key process requirement in the production of piezoelectric force sensors, often followed by laser welding and packaging. Ring-shaped piezoelectric force sensors, one of the most in-demand force sensors, often suffer damage to the sensor's exterior and internal sensitive components due to component rotation during pre-tightening. Existing technology lacks a suitable welding device.
[0003] Therefore, there is an urgent need for a pre-tightening welding device with a simple structure, easy operation and little damage to the sensor. Summary of the Invention
[0004] In response to the shortcomings of the existing technology, the utility model provides a pre-tightening welding device for an annular piezoelectric force sensor, which has a simple structure and is easy to operate. The force transmitted to the sensor during pre-tightening is an axial compression force, which effectively avoids damage to the sensor appearance and internal sensitive components caused by the rotation of the device during the pre-tightening process.
[0005] The utility model adopts the following technical solutions:
[0006] A pre-tightening welding device for an annular piezoelectric force sensor, comprising a base, an axial pressure rod, a positioning caliper, a positioning pin, a fastening nut and a fastening washer;
[0007] The base is fixed on the workbench, a positioning through hole A is provided in the center of the base, and a positioning blind hole is provided on one side of the base; a through hole is provided in the center of the annular piezoelectric sensor, and the annular piezoelectric sensor is placed on the base, and the through hole is placed corresponding to the positioning through hole A of the base;
[0008] The axial pressure rod includes an integrally formed pressure rod body and a pressure rod head at the upper end. The size of the pressure rod head is larger than the size of the positioning through hole A and the through hole. The bottom of the pressure rod body is provided with an external thread. The pressure rod body passes through the through hole of the annular piezoelectric sensor and the positioning through hole A of the base in sequence. A fastening washer and a fastening nut are sequentially provided on the pressure rod body at the bottom of the base. The fastening nut is provided at the external thread at the bottom of the pressure rod body.
[0009] Two concave slots are provided on one side of the pressure rod head. The positioning caliper is a thin-sheet connecting rod with a positioning slot that cooperates with the two slots at one end. A positioning through hole B is provided at the other end of the positioning caliper. The positioning through hole B is fixedly connected to the positioning blind hole of the base by a positioning pin.
[0010] Preferably, a plurality of support columns are provided at the bottom of the base.
[0011] Preferably, the positioning through hole A of the base has the same size as the through hole of the annular piezoelectric sensor.
[0012] Preferably, the size of the pressure rod head of the axial pressure rod is smaller than the outer weld of the annular piezoelectric sensor, and three sections of annular evenly distributed welding grooves are provided on the pressure rod head. The welding grooves are through-hole grooves, and the welding grooves are located directly above the inner weld of the annular piezoelectric sensor to expose the position of the inner weld for easy welding.
[0013] Preferably, the inner diameter of the welding groove is smaller than the inner diameter of the inner weld, and the outer diameter of the welding groove is larger than the outer diameter of the inner weld.
[0014] Preferably, the base is clamped to a heavy-duty workbench by an industrial vise.
[0015] When assembling and pre-tightening an annular piezoelectric force sensor, the utility model first clamps the base on a heavy-duty workbench with an industrial vise, places the annular piezoelectric force sensor to be pre-tightened on the base, aligns the through hole of the annular piezoelectric sensor with the positioning through hole A of the base, and inserts the main body of the axial pressure rod through the through hole of the annular piezoelectric sensor and the positioning through hole A of the base in sequence, positioning and mounting the sensor on the upper surface of the base. A fastening washer and a fastening nut are inserted into the bottom of the pressure rod body to mount it on the lower surface of the base.
[0016] Match the positioning slot of the positioning caliper with the slot of the pressure rod head, and pass the positioning pin through the positioning through hole B and the positioning blind hole of the base to achieve the rotation limit of the axial pressure rod. Calculate the required preload force in advance according to the designed range of the annular piezoelectric sensor, and use a torque wrench to twist the fastening nut to load the preload force. After the torque wrench reading reaches the required value (the torque wrench displays the torque in real time, and the torque is converted into the axial preload pressure value), the preload force is loaded, the base is removed from the heavy workbench, and the positioning pin and positioning caliper are removed for the next step of sensor laser welding and packaging.
[0017] During welding, the outer weld of the sensor is completely exposed, and a part of the inner weld is exposed (i.e., the corresponding part of the three-section annular evenly distributed welding grooves). There is no structural interference on the laser light path, and the outer weld is welded, and the inner weld is partially welded. After welding is completed, the positioning pin and the positioning caliper are reinstalled, and the base is clamped back on the heavy workbench through the industrial vise, the pre-tightening force is removed, and the sensor is removed for laser welding and repair welding. At this point, the pre-tightening welding and packaging link in the sensor assembly process is completed. In the present utility model, when tightening the fastening nut, the force applied is torque, and the force transmitted by the axial pressure rod to the workpiece is the axial pressing force. The axial pressing force can effectively constrain the sensor's axial rotational freedom. The present utility model efficiently completes the pre-tightening and welding packaging processes in the sensor assembly process by optimizing the annular piezoelectric sensor pre-tightening device, and can effectively avoid damage to the sensor appearance and internal sensitive components caused by the rotation of the device during the pre-tightening process, so as to ultimately achieve the effect of low risk, low damage and high efficiency in sensor production and assembly.
[0018] In the present invention, the package of the sensor core is formed by laser welding the base and the cover. Figure 10 As shown, the outer edge of the annular cover plate cooperates with the outer edge of the base to form an outer weld, and the gap formed by the inner edge of the annular cover plate and the inner edge of the base is an inner weld.
[0019] The beneficial effects of the utility model are:
[0020] The utility model has a simple structure and is easy to operate, and can efficiently complete the pre-tightening and welding packaging processes during the sensor assembly process.
[0021] The utility model realizes the compression of the sensor by pre-tightening the axial pressure rod through the tightening nut, converts the applied torsional force into the axial compression force on the sensor, and can effectively avoid the damage of the sensor appearance and internal sensitive components caused by the rotation of the device during the pre-tightening process, so as to achieve the low-risk, low-damage and high-efficiency effect of sensor assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a front view of a pre-tightening welding device for an annular piezoelectric force sensor according to the present invention;
[0023] Figure 2 This is a top view of the pre-tightening welding device for an annular piezoelectric force sensor of the present utility model;
[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the pre-tightening welding device for an annular piezoelectric force sensor of the present invention;
[0025] Figure 4 This is a schematic diagram of the base of the utility model;
[0026] Figure 5 This is a schematic diagram of the positioning caliper of the present utility model;
[0027] Figure 6 This is a schematic diagram of a positioning pin of the present utility model;
[0028] Figure 7 This is a schematic diagram of the axial compression rod of the present utility model;
[0029] Figure 8 This is a schematic diagram of a fastening gasket of the present utility model;
[0030] Figure 9 This is a schematic diagram of the fastening nut of the utility model;
[0031] Figure 10 This is a schematic diagram of the annular piezoelectric sensor of the present utility model;
[0032] Figure 11 A partial schematic diagram of the pre-tightening welding device after the positioning caliper and positioning pin are disassembled;
[0033] In the figure, 1-base, 2-fastening nut, 3-fastening gasket, 4-annular piezoelectric sensor, 5-axial pressure rod, 6-positioning caliper, 7-positioning pin, 11-support column, 12-positioning through hole A, 13-positioning blind hole, 41-external weld, 42-inner weld, 51-welding groove, 52-card slot, 53-external thread, 61-positioning card slot, 62-positioning through hole B. DETAILED DESCRIPTION
[0034] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, they will be described in detail below with reference to the accompanying drawings and specific embodiments, but are not limited to this. Matters not fully described in the present invention shall be based on conventional technology in the art.
[0035] Example 1
[0036] A pre-tightening welding device for an annular piezoelectric force sensor, such as Figure 1 ~ to Figure 3 As shown, it includes a base 1, an axial pressure rod 5, a positioning caliper 6, a positioning pin 7, a fastening nut 2 and a fastening washer 3;
[0037] The base 1 is clamped on the workbench by an industrial vise. A positioning through hole A12 is provided in the center of the base 1. Figure 4 , four support columns 11 are provided at the bottom of the base 1, and a positioning blind hole 13 is provided on one side of the base 1; a through hole is provided at the center of the annular piezoelectric sensor 4, and the annular piezoelectric sensor 4 is placed on the base 1, and the through hole is placed corresponding to the positioning through hole A12 of the base;
[0038] The axial pressure rod 5 includes an integrally formed pressure rod body and a pressure rod head at the upper end. The pressure rod head is larger than the positioning through hole A12 and the through hole. The bottom of the pressure rod body is provided with an external thread 53. Figure 7 As shown, the pressure rod body passes through the through hole of the annular piezoelectric sensor 4 and the positioning through hole A12 of the base 1 in sequence, and the pressure rod body is sequentially provided with a fastening washer 3 and a fastening nut 2 at the bottom of the base. The fastening nut 2 is provided at the external thread 53 at the bottom of the pressure rod body. The fastening washer 3 and the fastening nut are respectively as shown in FIG. Figure 8 、 Figure 9 As shown;
[0039] One side of the pressure rod head is provided with two concave slots 52, and the positioning caliper 6 is a thin-sheet connecting rod. Figure 5 As shown, one end is provided with a positioning slot 61 that cooperates with the two slots, and the other end of the positioning caliper 6 is provided with a positioning through hole B 62. The positioning through hole B 62 is fixedly connected to the positioning blind hole 13 of the base through a positioning pin 7. The positioning pin is a cylindrical structure, as shown Figure 6 shown.
[0040] The positioning through hole A12 of the base has the same size as the through hole of the annular piezoelectric sensor.
[0041] Example 2
[0042] A pre-tightening welding device for an annular piezoelectric force sensor, as described in Example 1, except that Figure 7 As shown, the size of the pressure rod head of the axial pressure rod 5 is smaller than the outer weld 41 of the annular piezoelectric sensor. Three sections of annular evenly distributed welding grooves 51 are provided on the pressure rod head. The welding grooves 51 are through-hole grooves. The welding grooves 51 are located directly above the inner weld 42 of the annular piezoelectric sensor, and are used to partially expose the position of the inner weld 42 to facilitate welding.
[0043] The inner diameter of the welding groove 51 is smaller than the inner diameter of the inner welding seam, and the outer diameter of the welding groove 51 is larger than the outer diameter of the inner welding seam.
[0044] In the present invention, the package of the sensor core is formed by laser welding the base and the cover. Figure 10 As shown, the outer edge of the annular cover plate cooperates with the outer edge of the base to form an outer weld 41 , and the inner edge of the annular cover plate cooperates with the inner edge of the base to form a gap as an inner weld 42 .
[0045] Example 3
[0046] The working process of a pre-tightening welding device for an annular piezoelectric force sensor is as follows:
[0047] When assembling and pre-tightening the annular piezoelectric force sensor, first clamp the base 1 on a heavy-duty workbench with an industrial vise. Place the annular piezoelectric force sensor 4 to be pre-tightened on the base 1, aligning the through-hole of the annular piezoelectric sensor with the positioning through-hole A12 of the base. Insert the main body of the axial compression rod 5 through the through-hole of the annular piezoelectric sensor and the positioning through-hole A12 of the base in sequence, and position the sensor on the upper surface of the base 1. Insert the fastening washer 3 and fastening nut 2 into the bottom of the compression rod body in sequence to mount it on the lower surface of the base 1.
[0048] Match the positioning slot 61 of the positioning caliper 6 with the slot 52 of the pressure rod head, and pass the positioning pin 7 through the positioning through hole B62 and the positioning blind hole 13 of the base to achieve the rotation limit of the axial pressure rod 5. Calculate the required preload force in advance according to the designed range of the annular piezoelectric sensor, and use a torque wrench to twist the fastening nut 2 to load the preload force. After the torque wrench reading reaches the required value (the torque wrench displays the torque in real time, and the torque is converted into the axial preload pressure value), the preload force is loaded, the base 1 is removed from the heavy workbench, and the positioning pin 7 and positioning caliper 6 are removed for the next step of sensor laser welding and packaging.
[0049] During welding, the outer weld 41 of the sensor is completely exposed, and a portion of the inner weld 42 is exposed (i.e., the portion corresponding to the three annular evenly distributed welding grooves). Figure 11 As shown, there is no structural interference on the laser light path, and the outer weld 41 is welded, as well as part of the inner weld. After welding is completed, the positioning pin 7 and the positioning caliper 6 are reinstalled, and the base is clamped back on the heavy workbench through the industrial vise, the pre-tightening force is removed, and the sensor is removed for laser welding and repair welding. At this point, the pre-tightening welding and packaging links in the sensor assembly process are completed. In the present utility model, when tightening the fastening nut 2, the force applied is torque, and the force transmitted by the axial pressure rod to the workpiece is the axial pressing force. The axial pressing force can effectively constrain the sensor's axial rotational freedom. The present utility model optimizes the annular piezoelectric sensor pre-tightening device to efficiently complete the pre-tightening and welding packaging processes in the sensor assembly process, and can effectively avoid damage to the sensor appearance and internal sensitive components caused by the rotation of the device during the pre-tightening process, so as to ultimately achieve the effect of low risk, low damage and high efficiency in sensor production and assembly.
[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A pre-tightening welding device for an annular piezoelectric force sensor, characterized in that: It includes a base, an axial pressure rod, a positioning caliper, a positioning pin, a fastening nut and a fastening washer; The base is fixed on the workbench, a positioning through hole A is provided in the center of the base, and a positioning blind hole is provided on one side of the base; a through hole is provided in the center of the annular piezoelectric sensor, and the annular piezoelectric sensor is placed on the base, and the through hole is placed corresponding to the positioning through hole A of the base; The axial pressure rod includes an integrally formed pressure rod body and a pressure rod head at the upper end. The size of the pressure rod head is larger than the size of the positioning through hole A and the through hole. The bottom of the pressure rod body is provided with an external thread. The pressure rod body passes through the through hole of the annular piezoelectric sensor and the positioning through hole A of the base in sequence. A fastening washer and a fastening nut are sequentially provided on the pressure rod body at the bottom of the base. The fastening nut is provided at the external thread at the bottom of the pressure rod body. Two concave slots are provided on one side of the pressure rod head, and a positioning slot that cooperates with the two slots is provided at one end of the positioning caliper. A positioning through hole B is provided at the other end of the positioning caliper. The positioning through hole B is fixedly connected to the positioning blind hole of the base by a positioning pin.
2. The pre-tightening welding device for an annular piezoelectric force sensor according to claim 1, characterized in that: A plurality of supporting columns are provided at the bottom of the base.
3. The pre-tightening welding device for an annular piezoelectric force sensor according to claim 2, characterized in that: The positioning through hole A of the base has the same size as the through hole of the annular piezoelectric sensor.
4. The pre-tightening welding device for an annular piezoelectric force sensor according to claim 1, characterized in that: The size of the pressure rod head of the axial pressure rod is smaller than the outer weld of the annular piezoelectric sensor. Three sections of annular evenly distributed welding grooves are provided on the pressure rod head. The welding grooves are through-hole grooves. The welding grooves are located directly above the inner weld of the annular piezoelectric sensor to expose the position of the inner weld.
5. The pre-tightening welding device for an annular piezoelectric force sensor according to claim 4, characterized in that: The inner diameter of the welding groove is smaller than the inner diameter of the inner welding seam, and the outer diameter of the welding groove is larger than the outer diameter of the inner welding seam.
6. The pre-tightening welding device for an annular piezoelectric force sensor according to claim 5, characterized in that: The base is clamped to the workbench with an industrial vise.