CN110849599A - Contact finger pressing force test and inspection device - Google Patents
Contact finger pressing force test and inspection device Download PDFInfo
- Publication number
- CN110849599A CN110849599A CN201910964714.7A CN201910964714A CN110849599A CN 110849599 A CN110849599 A CN 110849599A CN 201910964714 A CN201910964714 A CN 201910964714A CN 110849599 A CN110849599 A CN 110849599A
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- contact finger
- finger
- pressing force
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- rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the field of contact finger pressing force test and inspection devices, and particularly relates to a contact finger pressing force test and inspection device which comprises a base and a pressing force detection device, wherein the base is used for mounting a contact finger to be tested; the measuring assembly comprises a rod group with adjustable length, pressure sensors and connectors positioned at two ends, which are connected in series; the connectors at the two ends are used for matching with a pair of finger petal top supports which are symmetrical to the contact finger to be tested; the scale is arranged on the base, and the upper end of the scale is used as a measuring reference for measuring the joint displacement. The length of the measuring assembly is changed by adjusting the length of the rod group so as to support the deformation of the contact finger to be measured, and therefore the pressing force generated after the deformation of the symmetrical pair of contact finger petals can be conveniently measured. Meanwhile, the base is provided with the scale, the upper end of the scale can be used as a reference, the respective displacement of the connectors at the front end and the rear end of the measurement assembly before and after size adjustment is obtained, the respective deformation of the pair of measured touch finger petals is obtained, the relation between the deformation of each touch finger petal and the generated pressing force is finally obtained, and the touch finger product can be inspected.
Description
Technical Field
The invention belongs to the field of contact finger pressing force testing and inspecting devices, and particularly relates to a contact finger pressing force testing and inspecting device.
Background
In high-voltage switch equipment, a separable contact finger structure is mostly adopted for the butt joint of a main conductive loop, a contact is inserted into a contact finger, a top support contact finger flap generates elastic deformation along the radial direction, and the deformed contact finger flap applies pressing force to the contact in turn to realize the electric contact of the contact finger of the contact.
The reliability of the contact and the contact finger has important influence on the electric stability and the thermal stability of the switch equipment during long-term work and short-circuit current impact, when the pressing force is larger, the electric stability and the thermal stability of the electric contact can be ensured, but the friction force between the contact and the contact finger is increased due to the large pressing force, and the contact finger is easy to generate plastic deformation under the condition of large long-term stress, so that poor contact is caused, and ablation is caused. When the pressing force is small, the electric stability and the thermal stability of the electric contact cannot be guaranteed, so that the contact structure is damaged. Therefore, the selection of an appropriate finger pressing force is critical to the design and selection of the fingers.
The traditional pressing force is mainly calculated through a formula, however, the calculated pressing force is not accurate enough under the influence of the material and the processing technology of the contact fingers, and has a certain difference with the actual pressing force, particularly, some self-force contact fingers need to be tested by some testing devices to obtain the relation between the deformation amount of a contact finger valve and the pressing force, and for the produced contact finger products, corresponding testing devices are also needed to test whether the pressing force and the deformation amount of the contact fingers meet the requirements.
Disclosure of Invention
The invention aims to provide a contact finger pressing force testing and checking device, which is used for researching the relation between the deformation of a contact finger and the pressing force and checking whether the deformation of a contact finger product and the generated pressing force meet the requirements or not.
In order to achieve the purpose, the contact finger pressing force testing and checking device adopts the following technical scheme:
a contact finger pressing force test and inspection device comprises a base, a pressing force testing device and a pressing force inspection device, wherein the base is used for mounting a contact finger to be tested; the measuring assembly comprises a rod group with adjustable length, a pressure sensor and connectors positioned at two ends; the joint, the rod group and the pressure sensor are connected in series; the pressure sensor is connected in series in the rod group or positioned at one end of the rod group; the connectors at the two ends are used for matching with a pair of finger petal top supports which are symmetrical to the contact finger to be tested; the scale is arranged on the base, and the upper end of the scale is used as a measuring reference for measuring the joint displacement.
The invention has the beneficial effects that: during testing, the measuring assembly is matched with a pair of symmetrical finger valve top supports of the to-be-measured finger through the connectors at two ends, the length of the measuring assembly can be changed by adjusting the length of the rod group, the to-be-measured finger valve is supported by the measuring assembly to deform to generate pressing force, and the pressing force generated after the symmetrical pair of finger valve deformation can be conveniently measured due to the fact that the pressure sensor is arranged in the measuring assembly in series. Meanwhile, the base is provided with the scale, the upper end of the scale can be used as a reference, the respective displacement of the connectors at the front end and the rear end of the measurement assembly before and after size adjustment is obtained, the respective deformation of the pair of measured touch finger flaps is obtained, and finally the relation between the deformation of each touch finger flap and the generated pressing force is obtained. Similarly, the relation between the deformation and pressing force of each pair of contact finger petals of the contact finger product is measured and compared with standard data, so that whether the produced contact finger is qualified or not can be judged.
Furthermore, the end face of the joint, which is used for being in contact with the finger contact lobe, is an arc-shaped face with a central axis extending along the vertical direction.
The beneficial effects are that: based on the arc surface structure that the axial of touching finger lamella extended along the horizontal direction, set up the tip that connects and touch finger lamella complex as the arcwall face that the central axis extends along upper and lower direction for connect and touch between the finger lamella and be the point contact, be convenient for control on a straight line with the pressure force that the measuring component both ends receive.
Further, the measuring assembly further comprises a butt strap arranged on the upper side of the joint and used for being in lap joint with the top of a contact finger valve of a contact finger to be measured so as to position the measuring assembly in the vertical direction.
The beneficial effects are that: the access plate is arranged, so that the measuring assembly can be hung on the upper part of the contact finger, the measuring assembly is prevented from falling, and the measuring assembly is always in the installation position in the size adjusting process.
Furthermore, the rod group comprises a transmission rod and a screw rod which are matched in a plug-in mode, a guide hole used for being plugged in the screw rod is formed in the end portion of the transmission rod, an adjusting nut matched with the transmission rod in a stop mode is arranged on the screw rod, and the length of the rod group is adjusted by adjusting the installation position of the adjusting nut on the screw rod.
The beneficial effects are that: the transmission rod and the screw rod are connected in a plug-in fit mode, the screw rod is provided with a nut matched with the transmission rod in a stop mode, and the length of the rod group can be conveniently adjusted by adjusting the installation position of the adjusting nut.
Furthermore, a guide sleeve is arranged at one end of the screw rod, which is in plug-in fit with the transmission rod, and the screw rod is in guide fit with the guide hole through the guide sleeve.
The beneficial effects are that: the screw rod is in guide fit with the transmission rod through the guide sleeve, so that pressing force borne by the measuring assembly is transmitted along a straight line, and the stress direction of the measuring assembly is prevented from changing.
Further, the screw is provided with a rotation stopping structure for clamping a tool so as to prevent the screw from rotating when the position of the adjusting nut is adjusted.
The beneficial effects are that: when the position of adjusting nut is adjusted, can prevent that the screw rod from rotating through instrument centre gripping structure of splining.
Further, the rotation stopping structure is a fixing nut fixed on the screw rod.
The beneficial effects are that: the fixing nut is adopted as a rotation stopping structure, and the simple and convenient arrangement of the rotation stopping structure is realized.
Furthermore, a ruler mounting hole is formed in the middle of the base, the ruler is an L-shaped ruler, a screw penetrating hole corresponding to the ruler mounting hole is formed in the horizontal portion of the L-shaped ruler, and screws penetrate through the ruler mounting hole and the screw penetrating hole to fix the ruler on the base.
The beneficial effects are that: utilize the scale mounting hole cooperation at screw and base middle part to install the scale on the base, can unscrew the screw back and rotate the scale to the position of adjustment scale. After the measurement of one pair of finger contact lobes is finished, the position of the scale can be conveniently adjusted to measure the next pair of finger contact lobes.
Furthermore, a U-shaped groove used for avoiding the measuring assembly is formed in the upper end of the vertical part of the L-shaped scale.
The beneficial effects are that: the upper end of the scale is provided with a U-shaped groove which avoids the measuring component, so that the end parts of the scale are positioned at two sides of the measuring component, and operators can observe the measuring reference from different directions conveniently.
Furthermore, the base is provided with a fixing hole for fixing the contact finger to be detected, the fixing hole is matched with a threaded hole in the bottom of the contact finger to be detected, and the fixing of the contact finger to be detected on the base is realized by penetrating and installing a screw in the fixing hole and the threaded hole in the bottom of the contact finger to be detected.
The beneficial effects are that: the threaded hole of the contact finger to be tested is directly utilized to fix the contact finger to be tested, so that the contact finger to be tested is convenient to install and fix.
Drawings
FIG. 1 is a diagram showing a state of use of a finger pressing force testing and detecting apparatus in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a base of a finger pressing force testing and detecting apparatus in embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a measuring unit according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of a joint in example 1 of the present invention;
FIG. 5 is a schematic view showing the structure of a transmission rod in embodiment 1 of the present invention;
FIG. 6 is a schematic view showing the structure of a screw in example 1 of the present invention;
FIG. 7 is a schematic structural view of a scale in embodiment 4 of the present invention;
in the figure: 1-a base; 2-a measuring assembly; 3-a scale; 4-the contact finger to be detected; 5-fixing holes; 6-rod group; 7-a pressure sensor; 8-a linker; 9-a transmission rod; 10-a screw; 11-connector mounting holes; 12-a butt strap; 13-attachment holes for attachment straps; 14-end threaded hole; 15-a pilot hole; 16-a threaded segment; 17-a guide section; 18-a guide sleeve; 19-an adjusting nut; 20-fixing the nut; 21-a scale mounting hole; 22-a screw through hole; 23-U-shaped groove; 24-a scale; 222-screw mounting holes; 223-U-shaped groove.
Detailed Description
The embodiment 1 of the finger-touch pressing force testing and verifying device of the invention, as shown in fig. 1, comprises a base 1, a measuring assembly 2 and a scale 3.
Wherein, base 1 is used for placing and fixed the contact finger 4 that awaits measuring, and measuring component 2's adjustable and inside string of size is equipped with pressure sensor, and during the use, the size of adjusting measuring component 2 props the contact finger lamella deformation that awaits measuring contact finger 4 through measuring component 2 top to measure the produced packing force of contact finger lamella deformation. The scale 3 is fixed on the base 1, and the upper end is as the measuring basis, and the operating personnel of being convenient for acquires the deflection of unilateral finger flap.
In this embodiment, the structure of the base 1 is as shown in fig. 2, the base 1 is a plate-shaped structure, the upper plate surface of the base 1 is a bearing surface for bearing the contact finger 4 to be tested, the base 1 is provided with fixing holes 5 for fixing the contact finger 4 to be tested, the number and size of the fixing holes correspond to the threaded holes at the bottom of the contact finger to be tested, and the contact finger 4 to be tested is fixed on the base 1 by inserting screws into the fixing holes 5 and the threaded holes at the bottom of the contact finger to be tested. Regarding the installation mode of the contact finger to be tested on the base, in other embodiments, a positioning groove matched with the bottom structure of the contact finger to be tested can be further formed in the upper portion of the plate-shaped base, the contact finger to be tested can be inserted and fixed on the base, and a fixing pin matched with a threaded hole in the bottom of the contact finger to be tested can also be arranged on the upper portion of the base. As for the structure of the base, it is also possible to provide the base in a frame-type structure.
The structure of the measuring component 2 is shown in fig. 3, and comprises a rod group 6, a pressure sensor 7 and two connectors 8 which are connected in series and matched with each other, wherein the two connectors 8 are distributed at the left end and the right end of the measuring component 2, and the measuring component 2 is matched with finger belly jacking supports of a pair of symmetrical finger touching petals of the to-be-measured contact finger 4 through the connectors 8 at the two ends. The rod group 6 is adjustable in length and comprises a transmission rod 9 and a screw 10, and the pressure sensor 7 is arranged between the joint 8 on the left side and the transmission rod 9. In other embodiments, the pressure sensor may also be connected in series inside the rod set.
The structure of the joint 8 is shown in fig. 4, the joint 8 is made of a block-shaped material, and the material is steel with hardness higher than that of a common copper material. The end face of one end of the joint 8, which is in contact with the contact finger 4 to be tested, is an arc-shaped face with a central axis extending in the vertical direction, so that point contact between the joint 8 and the contact finger flap can be ensured. And a joint mounting hole 11 is formed at the other end of the joint 8 and is used for being matched and connected with the pressure sensor 7 or the screw 10. In other embodiments, the end of the joint matched with the contact finger can be set to be in a frustum structure, so that the joint is in line contact with the contact finger lobe with a shorter length.
Further, measuring component 2 is still including setting up the attachment strap 12 at the 8 upside that connect, and attachment strap 12 is used for touching the finger lamella top overlap joint cooperation with awaiting measuring to indicate, realizes the dress of hanging of measuring component 2 on the finger 4 that awaits measuring that touches, carries out the location of direction from top to bottom to measuring component 2, prevents that measuring component 2 from dropping, improves the convenience that measuring component used. The upper part of the joint 8 is provided with an access board mounting hole 13, the access board mounting hole 13 is a threaded hole, and the access board 12 is fixed on the upper side of the joint 8 by screwing a screw in the access board mounting hole 13. During the use, measuring component 2 hangs the dress at the contact finger 4 top that awaits measuring through the attachment strap, and the adjusting screw revolves the volume in attachment hole 13 of attachment strap, can change measuring component 2's mounting height for measuring component 2 can be applicable to the contact finger of different specifications. In other embodiments, a spacer may be disposed between the strap and the finger to adjust the mounting height of the measurement assembly.
In other embodiments, the strap may be fixed to the upper side of the joint in a non-detachable manner, such as welding or riveting. Of course, on the premise of not considering the convenience of use of the measuring assembly, the measuring assembly is prevented from falling down through manual control of an operator during use without arranging a butt strap for simplifying the structure of the measuring assembly.
The structure of the transmission rod 9 in the rod group 6 is shown in fig. 5, the left end of the transmission rod 9 is provided with an end threaded hole 14 for being in threaded connection with a joint of the pressure sensor 7, and the right end is provided with a guide hole 15 for being in inserted fit with the screw rod 10. The screw 10 has a structure as shown in fig. 6, one end of which is a threaded section 16 for connecting with the transmission rod 9, and the other end of which is a guide section 17 for inserting and matching with the right-side connector 8. During assembly, a guide sleeve 18 and two nuts are sequentially screwed on the threaded section 16 from left to right, and the screw 10 is in guide fit with the guide hole 15 through the guide sleeve 18. In other embodiments, the guide sleeve is not arranged, and the guide hole is directly matched and inserted with the thread section of the screw rod.
The left nut of the two nuts is an adjusting nut 19 in stop fit with the transmission rod 9, the mounting position of the adjusting nut 19 on the screw rod 10 is adjustable, and the insertion amount of the screw rod 10 in the guide hole 15 can be changed by adjusting the position of the adjusting nut 19 on the screw rod 10, so that the length of the rod group 6 is adjusted. The right nut is a fixing nut 20, the fixing nut 20 is screwed to the root of the thread and is fixedly riveted for clamping a tool so as to prevent the screw 10 from rotating when the length of the rod set is adjusted, and the fixing nut 20 forms a rotation stopping structure of the screw 10. In other embodiments, instead of providing a fixing nut, a planar structure for clamping a tool may be machined on the screw rod as the rotation stopping structure. Of course, the screw rod can be directly clamped by using a tool when the length of the rod group is adjusted without arranging a rotation stopping structure on the screw rod, and the screw rod is prevented from rotating through the friction force between the tool and the screw rod.
In order to install the scale 3, the middle part of base 1 has still seted up scale mounting hole 21, and in this embodiment, scale 3 is the L type scale that the L type board was made of bending, and its horizontal part is seted up the screw that corresponds with scale mounting hole 21 and is worn dress hole 22, wears to adorn the screw through wearing in scale mounting hole 21 and screw dress hole 22 and fix scale 3 on base 1. In this embodiment, the screw insertion hole 22 is a long hole to facilitate adjustment of the installation position of the scale 3.
In order to avoid the measuring assembly 2, the upper end of the vertical part of the scale 3 is provided with a U-shaped groove 23, and in the embodiment, the guide section 17 of the screw 10 penetrates through the U-shaped groove 23, so that the end parts of the scale 3 are positioned at two sides of the measuring device, and an operator can conveniently observe from different directions. In other embodiments, the end of the scale may not be provided with a U-shaped groove, and when in use, the scale is arranged beside the measuring component to avoid interference between the scale and the measuring component. To the structure of scale, can also set up the scale into vertical shaft-like, correspondingly, set up a plurality of scale plug-in mounting holes on the base, when needing to measure a certain pair of touching finger, with the scale plug-in mounting in corresponding scale plug-in mounting downthehole can.
As shown in fig. 3, a distance between the adjusting nut 19 and the fixing nut 20 is defined as "a", and a distance between the right-hand joint and the upper end of the scale 3 is defined as "b". During the use, fix scale 3, the feeler 4 that awaits measuring on base 1, and hang measuring unit 2 and adorn at the feeler 4 top that awaits measuring, adjust adjusting nut 19 mounted position on screw rod 10, the adjustment instrument can be two tool pincers, a tool pincers hold fixation nut 20, in order to prevent screw rod 10 from rotating, adjusting nut 19 is twisted to another tool pincers, in order to adjust measuring unit 2's size, make both sides connect 8 and the feeler petal top of 4 that awaits measuring and indicate, guarantee that measuring unit 2 does not have obvious rocking volume, measure distance an between fixation nut 20 and the adjusting nut 19 under this state1And the distance b between the joint 8 on the right and the top of the scale 31The measuring tool can be a vernier caliper. Then further adjusting the size of the measuring assembly 2 to deform the top supporting finger flap of the measuring assembly 2, and measuring the distance a between the adjusted fixing nut 20 and the adjusting nut 192And the distance b between the joint 8 on the right and the top of the scale 32According to the formula △ a ═ a2-a1The sum △ a of the deformation of the two finger flaps is obtained according to the formula △ b ═ b2-b1The displacement amount △ b of the joint 8 on the right before and after adjustment, that is, the deformation amount of the right-side finger flap is obtained, and then it is determined according to the formula △ b′The displacement △ b of the left joint 8 before and after adjustment is obtained from △ a- △ b′I.e., the amount of deformation of the left side finger flap, and reads the reading of the pressure sensor. And repeating the operation to obtain the pressing force generated by different contact finger petals under different deformation amounts. Of course, the displacement of the two ends of the measuring assembly before and after the size adjustment can be directly measured by using the measuring tool with the upper end of the scale as a reference, so that the respective deformation of the pair of symmetrical finger flaps can be obtained.
The embodiment 2 of the contact finger pressing force measuring tool is different from the embodiment 1 in that the transmission rod and the screw rod are in inserted fit in the embodiment 1, the transmission rod and the screw rod are in threaded connection in the embodiment, and the axial size of the measuring assembly is adjusted by changing the threaded connection amount between the transmission rod and the screw rod during use.
The embodiment 3 of the contact finger pressing force measuring tool is different from the embodiment 1 in that the transmission rod and the screw rod are in inserted fit in the embodiment 1, the rod group is a small cylinder in the embodiment, and the size of a measuring assembly is adjusted by adjusting the extension amount of a push rod of the cylinder.
Claims (10)
1. A contact finger pressing force testing and checking device is characterized by comprising:
the base is used for mounting the contact finger to be tested;
the measuring assembly comprises a rod group with adjustable length, a pressure sensor and joints positioned at two ends;
the joint, the rod group and the pressure sensor are connected in series;
the pressure sensor is connected in series in the rod group or positioned at one end of the rod group;
the connectors at the two ends are used for matching with a pair of finger petal top supports which are symmetrical to the contact finger to be tested;
and the scale is arranged on the base, and the upper end of the scale is used as a measuring reference for measuring the joint displacement.
2. The finger pressing force testing and verifying apparatus as claimed in claim 1, wherein the end surface of the contact for contacting the finger flap is an arc surface having a central axis extending in an up-down direction.
3. The contact finger pressing force testing and inspecting device according to claim 1 or 2, wherein the measuring assembly further comprises an attachment plate disposed on an upper side of the joint for overlapping-fitting with a top portion of a contact finger flap of the contact finger to be measured to vertically position the measuring assembly.
4. The contact finger pressing force testing and inspecting device according to claim 1, wherein the rod set comprises a transmission rod and a screw rod which are inserted and matched, a guide hole for inserting the screw rod is formed in the end portion of the transmission rod, an adjusting nut matched with the transmission rod in a stop mode is arranged on the screw rod, and the length of the rod set is adjusted by adjusting the installation position of the adjusting nut on the screw rod.
5. The contact finger pressing force testing and verifying device of claim 4, wherein a guide sleeve is arranged at one end of the screw rod in inserting fit with the transmission rod, and the screw rod is in guide fit with the guide hole through the guide sleeve.
6. The finger hold force testing and verifying apparatus of claim 4, wherein said screw is provided with a rotation stop structure for holding a tool to prevent rotation of the screw when adjusting the position of the adjusting nut.
7. The finger hold down force testing and verifying attachment of claim 6, wherein said rotation stop structure is a retaining nut secured to said threaded rod.
8. The finger pressing force testing and inspecting device according to claim 1, wherein a ruler mounting hole is formed in a middle portion of the base, the ruler is an L-shaped ruler, a screw insertion hole corresponding to the ruler mounting hole is formed in a horizontal portion of the L-shaped ruler, and the ruler is fixed to the base by inserting screws into the ruler mounting hole and the screw insertion hole.
9. The finger pressing force testing and verifying device of claim 8, wherein a U-shaped groove for avoiding the measuring assembly is formed at the upper end of the vertical part of the L-shaped scale.
10. The contact finger pressing force testing and checking device as claimed in claim 1, wherein the base is provided with a fixing hole for fixing the contact finger to be tested, the fixing hole is matched with a threaded hole at the bottom of the contact finger to be tested, and the contact finger to be tested is fixed on the base by penetrating a screw into the fixing hole and the threaded hole at the bottom of the contact finger to be tested.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964714.7A CN110849599B (en) | 2019-10-11 | 2019-10-11 | Contact finger pressing force test and inspection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910964714.7A CN110849599B (en) | 2019-10-11 | 2019-10-11 | Contact finger pressing force test and inspection device |
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| CN110849599A true CN110849599A (en) | 2020-02-28 |
| CN110849599B CN110849599B (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113916426A (en) * | 2021-09-01 | 2022-01-11 | 保定德优电气设备制造有限公司 | Detection apparatus for plum blossom contact touches finger contact pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916426A (en) * | 2021-09-01 | 2022-01-11 | 保定德优电气设备制造有限公司 | Detection apparatus for plum blossom contact touches finger contact pressure |
| CN113916426B (en) * | 2021-09-01 | 2024-04-12 | 保定德优电气设备制造有限公司 | Detection device for contact pressure of contact finger of quincuncial contact |
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| CN110849599B (en) | 2021-10-01 |
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