Annular contact finger pressure measuring device

Abstract

The invention relates to an annular contact finger pressure measuring device. The annular contact finger pressure measuring device comprises a supporting structure and a cylindrical testing head, one end of the supporting structure is provided with a gap for dividing the corresponding end part of the supporting structure into a first part and a second part which are elastically connected; the cylindrical testing head is composed of a left half part and a right half part, and the left half part and the right half part are fixed to the first part and the second part respectively, so that the left half part and the right half part are buckled to form the cylindrical testing head with a gap reserved in the middle; the pressure sensor is used for measuring the stress of the contact piece of the annular contact finger when the contact piece is pressed on the peripheral surface of the cylindrical testing head through the change of the gap of the supporting structure or the gap of the cylindrical testing head, so that the pressure measurement of the whole circle of contact piece of the annular contact finger can be carried out by utilizing one pressure sensor; and the manufacturing cost of the annular contact finger pressure measuring device is reduced.

Description

Technical Field

[0001] The invention relates to an annular stylus pressure measuring device, belonging to the technical field of stylus pressure measurement. Background Art

[0002] At present, the ring-shaped contact finger structure is widely used in the plug-in structure of DC disconnector products. By adopting the ring-shaped contact finger structure, the contacts and the contact fingers are in contact at multiple points, which can meet the needs of long-term high-current operation. In order to ensure the contact pressure between the contact fingers and reduce the contact resistance, a contact finger spring is installed on the outer ring of the ring-shaped contact finger. The commonly used ring-shaped contact fingers of disconnector products are mostly 20 to 30 pieces according to the current requirements. Due to the dispersion of the manufacturing of the ring-shaped contact fingers and the dispersion of the assembly of the outer ring contact finger spring, when the ring-shaped contact fingers are in contact with the contacts, the clamping pressure of each contact piece on the ring-shaped contact finger is inconsistent, and there is even a situation where some of the contact pieces are in virtual contact with the contacts, which affects the product's current flow. In severe cases, the contact fingers and contacts may be burned, endangering the stability of product operation.

[0003] In order to detect the contact between the annular contact finger and the contact, after the product is assembled or the power station is installed, the contact finger pressure is measured to detect whether the contact finger and the contact are in reliable contact. In the prior art, on the one hand, a method of measuring the clamping force of a single pair of contact fingers is provided, wherein the opening of the test head is adjusted to the same size as the contact, and inserted between two contact fingers distributed 180° on the annular contact finger. The test head is connected to a display box through a data output line for pressure display. However, during the test process, it needs to be repeated many times to complete the pressure measurement of the entire circle of contact fingers, which has the problems of complex operation and long time consumption.

[0004] On the other hand, two sector-shaped semicircular simulated contacts are inserted into the contact fingers, and the pressure of the contact fingers is measured by a pressure sensor arranged on one side of the sector-shaped contact. The sector-shaped test head is connected to a display box for display, and the synthesis of the component forces of each contact piece on the annular circumference in the semicircular arrangement is obtained. Obviously, it cannot accurately represent the pressure conditions of each contact piece on the circumference. At the same time, since the display box is relatively bulky, it needs to be connected to a 220V power supply during testing, which is inconvenient to carry and causes trouble in operation. It cannot be used for high-altitude operations at power stations. Summary of the invention

[0005] The object of the present invention is to provide a ring-shaped stylus pressure measuring device to solve the problem that the total pressure on the measuring head cannot be accurately indicated.

[0006] To achieve the above object, the present invention provides an annular stylus pressure measuring device, comprising a support structure and a cylindrical test head; a gap is provided at one end of the support structure to divide the corresponding end of the support structure into a first part and a second part which are elastically connected;

[0007] The cylindrical test head is composed of a left half and a right half, and the left half and the right half are respectively fixed on the first part and the second part, so that the left half and the right half are buckled together to form a cylindrical test head with a gap in the middle;

[0008] Also included is a pressure sensor for measuring the force exerted when the contact piece of the annular contact finger is pressed against the outer peripheral surface of the cylindrical test head through the change of the support structure gap or the cylindrical test head gap.

[0009] Furthermore, the supporting structure is a rectangular metal sheet, and the gap is opened along the length direction at one end of the width to divide the rectangular metal sheet into the first part and the second part which are equal in the width direction.

[0010] Furthermore, the pressure sensor is a strain gauge, which is attached to one side of the gap of the support structure.

[0011] Furthermore, the main body of the supporting structure includes a display assembly, and the display assembly is connected to the pressure sensor via a cable.

[0012] Furthermore, the display assembly includes a display and a lithium battery for providing power to the pressure sensor and the display.

[0013] Furthermore, a hand-held handle is provided at the other end of the supporting structure.

[0014] Furthermore, the support structure gap has a range of 5-10 mm.

[0015] The beneficial effects of the present invention are as follows: the annular contact finger pressure measuring device comprises a supporting structure and a cylindrical test head; a gap is provided at one end of the supporting structure, dividing the corresponding ends of the supporting structure into a first part and a second part which are elastically connected; the cylindrical test head is composed of a left half and a right half, the left half and the right half are respectively fixed on the first part and the second part, so that the left half and the right half are buckled together to form a cylindrical test head with a gap in the middle; and a pressure sensor is also included for measuring the force exerted when the contact piece of the annular contact finger is pressed against the outer peripheral surface of the cylindrical test head through the change of the gap of the supporting structure or the gap of the cylindrical test head, so that the pressure measurement of the contact piece of the entire circle of the annular contact finger can be carried out by using one pressure sensor, thereby reducing the manufacturing cost of the annular contact finger pressure measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a ring-shaped stylus pressure measurement device in an actual application scenario according to one aspect of the present invention;

[0017] Figure 2It is a front view A, a left view B and a stereoscopic view C of the left half or the right half of a cylindrical test head in a ring-shaped stylus pressure measuring device in one aspect of the present invention;

[0018] Figure 3 It is a schematic diagram of the upper and lower structure of a cylindrical test head in a ring-shaped stylus pressure measurement device according to one aspect of the present invention;

[0019] Figure 4 It is a schematic diagram of the use of a ring-shaped stylus pressure measurement device in one aspect of the present invention when measuring in an actual application scenario;

[0020] Figure 5 A distribution diagram of contact pieces of an annular contact finger when measuring pressure of an annular contact finger pressure measuring device according to one aspect of the present invention in an actual application scenario;

[0021] Figure 6 It is a contact piece pressure analysis diagram of a ring-shaped contact finger pressure measurement device in one aspect of the present invention when measuring in an actual application scenario;

[0022] Reference numerals:

[0023] 110- annular contact finger; 120- contact finger spring; 130- annular contact finger pressure measuring device;

[0024] 210- cylindrical test head; 220- connecting bolt; 230- pressure sensor; 240- supporting structure; 250- cable; 260- display assembly; 270 handheld handle; 280- supporting structure gap; 290- cylindrical test head gap;

[0025] 211 - left half of cylindrical test head; 212 - right half of cylindrical test head; 213 bolt hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] The inventive concept of the present invention is as follows: a gap is provided for the support structure of the annular contact finger pressure measuring device to divide the corresponding ends of the support structure into a first part and a second part which are elastically connected, and a pressure sensor is set to measure the force applied when the contact piece of the annular contact finger is pressed against the outer peripheral surface of the cylindrical test head through the change of the support structure gap or the cylindrical test head gap, so that during the measurement process, the pressure sensor can sensitively respond to the change of the gap, thereby completing the accurate measurement of the annular contact finger pressure.

[0028] Annular contact finger pressure measuring device embodiment 1:

[0029] like Figure 1, which is a schematic structural diagram of an annular stylus pressure measuring device according to one aspect of the present invention in an actual application scenario, wherein the annular stylus pressure measuring device 130 includes a support structure 240 and a cylindrical test head 210 .

[0030] Here, the side of the cylindrical test head 210 is formed by an arc-shaped baffle on the outer periphery, and one end (upper bottom) is closed, and is specifically formed by the buckling of the cylindrical test head left half 211 and the cylindrical test head right half 212. Figure 2 As shown in the figure, there are front view, left view and stereogram of the left half or right half of the cylindrical test head in this embodiment, wherein A is the front view of the left half or right half of the cylindrical test head, B is the left view of the left half or right half of the cylindrical test head, and C is the stereogram of the left half or right half of the cylindrical test head. Bolt holes 213 for fixing the cylindrical test head 210 on the support structure 240 are provided on the bottom surface of the semicircular sector-shaped left half or right half, as shown in FIG. Figure 3 , is a schematic diagram of the upper base structure of a cylindrical test head in a ring-shaped stylus pressure measuring device according to one aspect of the present invention, wherein a connecting bolt 220 is provided in the middle of the upper base of the cylindrical test head, and specifically, the connecting bolt 220 is composed of four bolt holes 213.

[0031] A support structure gap 280 is provided at one end of the support structure 240 to divide the corresponding end of the support structure 240 into a first part and a second part that are elastically connected (here, the range of the support structure gap is 5-10 mm); the first part and the second part are bent at one end toward the corresponding end to form a fixing portion for fixing the cylindrical test head 210. Figure 3 As shown, the cylindrical test head left half 211 and the cylindrical test head right half 212 are respectively fixedly connected to the corresponding fixing parts of the first part and the second part through their respective bolt holes 213 by connecting bolts 220. After fixing, the left half and the right half are buckled together to form a cylindrical test head with a gap in the middle, that is, after installation, a cylindrical test head gap 290 is formed on the cylindrical test head 210, so that the support structure gap 280 and the cylindrical test head gap 290 correspond to each other.

[0032] The annular contact finger pressure measuring device 130 also includes a pressure sensor 230 for measuring the force exerted when the contact piece of the annular contact finger is pressed against the outer circumference of the cylindrical test head through changes in the support structure gap 280 or the cylindrical test head gap 290; here, the pressure sensor 230 is a strain gauge, which is attached to one side of the support structure gap 280.

[0033] The support structure 240 is also equipped with a display assembly 260, which is connected to the pressure sensor 230 via a cable 250 so that the pressure sensor sends a gap change signal to the display assembly, wherein the display assembly 260 includes a display and a lithium battery for providing power to the pressure sensor 230 and the display. At the same time, the lithium battery can be charged through the charging port without an external power supply, which is convenient for operation.

[0034] In addition, in the above embodiment, a hand-held handle 270 is further provided at the other end of the support structure 240; the support structure 240 is a rectangular metal sheet, and the gap is opened along the length direction at one end of the width of the rectangular metal sheet to divide the rectangular metal sheet into equal first and second parts in the width direction, so that the first and second parts of the support structure 240 are respectively connected to the left half 211 and the right half 212 of the cylindrical test head.

[0035] Annular contact finger pressure measuring device embodiment 2:

[0036] In a preferred embodiment of the present invention in an actual application scenario, the annular stylus pressure measuring device includes a cylindrical test head, a connecting bolt, a pressure sensor assembly, a support structure, a cable, a display assembly and a hand-held handle. The support structure and the hand-held handle are designed as a whole. There is a groove at the front end of the hand-held handle to install and fix the display assembly. The cylindrical test head is designed as two semi-cylinders and is fixed to the support structure by connecting bolts. A gap for detecting deformation (i.e., a support structure gap) is provided at the front end of the support structure, and a pressure sensor assembly is installed on one side of the gap. The pressure sensor assembly is connected to the display assembly by a cable. The display assembly includes a display and a lithium battery, and an equivalent operator of the pressure sensor is built into the display assembly so that the display assembly displays the annular stylus pressure.

[0037] Example 1 of using the annular stylus pressure measuring device:

[0038] like Figure 4 As shown, it is a schematic diagram of the use of an annular stylus pressure measuring device according to one aspect of the present invention in measurement in an actual application scenario, wherein the annular stylus pressure measuring device 130 is inserted into the annular stylus 110, and the outer ring of the annular stylus 110 is equipped with a stylus spring 120, so that the annular stylus 110 holds each contact piece on the circumference of the contact finger, and the contact piece on the annular stylus 110 presses against the side of the cylindrical test head 210, and the pressure sensor 230 on the annular stylus pressure measuring device 130 detects the pressure and displays it in real time through the display assembly 260.

[0039] Example 2 of using the annular stylus pressure measuring device:

[0040] Following the above preferred embodiment of the present invention, when the annular contact finger pressure measuring device is inserted into the annular contact finger, since the size of the cylindrical test head is slightly larger than the inner diameter of the annular contact finger, the annular contact finger is pushed outward, and under the action of the contact finger spring, the contact pieces on the circumference press the cylindrical test head, and the cylindrical test head is fixed to the front end of the support structure. After being subjected to force, it shrinks inward, causing the gap of the support structure to become smaller and cause slight deformation. The deformation amount is detected by a pressure sensor assembly fixed nearby, and a signal is generated, which is transmitted to the display on the display assembly through a cable. After the equivalent operator performs pressure calculation in the display, the sum of the pressure values ​​of all the contact pieces on the outer circle of the annular contact finger is displayed.

[0041] Pressure calculation example 1 of the annular contact finger pressure measuring device:

[0042] In another preferred embodiment of the present invention, firstly, the number of contact pieces of the annular contact finger is preferably 30, and the 30 contact pieces are evenly distributed on the circumference of the annular contact finger (eg Figure 5 , is a contact piece distribution diagram of an annular contact finger when measuring in an actual application scenario according to an annular contact finger pressure measuring device of one aspect of the present invention, wherein the contact piece of the annular contact finger is 30 contact pieces evenly distributed, that is, n=30), and a contact finger spring is assembled on the outer ring of the annular contact finger to achieve uniform arrangement of the circumferential contact pieces of the annular contact finger, and the contact finger spring on the outer ring of the annular contact finger evenly holds the contact finger, and the pressure exerted by the contact piece on the test head is consistent.

[0043] Next, when the cylindrical test head is inserted into the annular contact finger, the force exerted by any contact piece on the annular contact finger on the semicircular sector is set to F, such as Figure 6 As shown, F can be decomposed into a horizontal force F1 and a vertical force F0, wherein only the force in the F1 direction can cause the cylindrical test head to contract inward. Since the pressure sensor assembly is only installed on one side of the support structure gap, the pressure sensor can only detect the pressure of half of the contact pieces on the circumferential contact piece in the F1 direction, that is, the synthesis of the component forces of 15 contact pieces in the horizontal direction (in the preferred embodiment, n=30, then here it is n / 2 pieces, and n is the number of contact pieces of the annular contact finger).

[0044] At this time, the contact pieces combined with the annular contact fingers are evenly distributed on the circumference. According to the equivalent factor, the total pressure value is calculated by the following formula:

[0045]

[0046] Where, F is the total pressure; is the equivalent factor; f is the measured value of the pressure sensor;

[0047] in, in:

[0048]

[0049] And so on.

[0050]

[0051] Where n is the number of contacts of the annular contact finger to be tested; ∝ is the arc between the proximal and distal ends of the contact; is the arc between the horizontal direction and the proximal end of the contact piece; and in the preferred embodiment, n = 30, so the equivalent factor is The total pressure value F is obtained based on the equivalent factor.

[0052] When the finger pressure measuring device of the present invention is used, the annular finger pressure measuring device is placed horizontally and stably by holding the handle. At this time, the cylindrical test head is divided into left and right parts, and the support structure gap is also divided into left and right parts. The gravity of the cylindrical test head itself will not affect the measurement of the pressure sensor assembly. The annular finger pressure measuring device is held and inserted into the annular finger. The contact pieces on the circumference of the annular finger press the cylindrical test head through the contact spring. The micro-deformation of the contact piece to the support structure gap is measured by the pressure sensor assembly and transmitted to the display assembly through the cable. The total pressure value is calculated by using the equivalent operator, and the calculated total pressure value of the entire circle of contact pieces of the annular finger is displayed on the display of the display assembly.

[0053] The pressure between the annular contact finger and the cylindrical test head is ensured by the contact finger spring on the outer ring of the annular contact finger. When the display value is greater than the minimum value required by the annular contact finger, the annular contact finger is deemed qualified, providing an accurate basis for judging whether the pressure of the annular contact finger is qualified or not.

[0054] To sum up, the relevant algorithm of the equivalent factor is designed on the display. After calculation, the pressure sensor is used to directly display the sum of the pressure values ​​of all the contacts in the outer ring of the annular contact finger, which is compared with the design value of the contact pressure, so as to form the qualified criterion of the contact finger pressure, reduce the manufacturing cost of the annular contact finger pressure measuring device, and is simple to operate. A measuring device is formed in which the test head and the display are integrated, and a lithium battery is attached to provide power directly for the measuring device, freeing itself from the structural constraints of the external power supply and the independent display box display, and realizing lightweight handheld measurement, which is suitable for the measurement of the annular contact finger pressure under the working conditions of the power station. In addition, the annular disposal pressure measuring device of the present invention can also realize the annular contact finger pressure measurement of 408kV~1120kV voltage level annular contact finger structure DC disconnector, 408kV~816kV voltage level annular contact finger structure DC grounding switch, and 252kV~550kV voltage level annular contact finger structure AC disconnector.

Claims

1. A ring-shaped stylus pressure measuring device, characterized in that: It comprises a support structure and a cylindrical test head; one end of the support structure is provided with a gap which divides the corresponding end of the support structure into a first part and a second part which are elastically connected; The cylindrical test head is composed of a left half and a right half, and the left half and the right half are respectively fixed on the first part and the second part, so that the left half and the right half are buckled together to form a cylindrical test head with a gap in the middle; Also included is a pressure sensor for measuring the force exerted when the contact piece of the annular contact finger is pressed against the outer peripheral surface of the cylindrical test head through the change of the support structure gap or the cylindrical test head gap.

2. The annular stylus pressure measuring device according to claim 1, characterized in that: The supporting structure is a rectangular metal sheet, and the gap is opened along the length direction at one end of the width to divide the rectangular metal sheet into the first part and the second part which are equal in the width direction.

3. The annular stylus pressure measuring device according to claim 1, characterized in that: The pressure sensor is a strain gauge and is attached to one side of the gap of the support structure.

4. The annular stylus pressure measuring device according to claim 1, characterized in that: The main body of the supporting structure includes a display assembly, and the display assembly is connected to the pressure sensor through a cable.

5. The annular stylus pressure measuring device according to claim 4, characterized in that: The display assembly includes a display and a lithium battery for providing power to the pressure sensor and the display.

6. The annular stylus pressure measuring device according to claim 1, characterized in that: The other end of the support structure is provided with a hand-held handle.

7. The annular stylus pressure measuring device according to any one of claims 1 to 6, characterized in that: The opening range of the support structure gap is 5-10mm.

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