Bimetallic strip detection device and detection method

Abstract

The invention relates to the technical field of low-voltage electric appliances, and particularly discloses a bimetallic strip detection device and a detection method. The bimetallic strip detection device comprises a bottom plate, a first mounting seat, a displacement detection piece, a second mounting seat, a thrust detection piece, a driving mechanism and a control system. The first mounting seat is arranged on the bottom plate and is provided with a bimetallic strip fixing part and a displacement detection piece close to an active layer of the bimetallic strip; the second mounting seat is slidably connected to the bottom plate to get close to or away from the first mounting seat; the thrust detection piece is arranged on the second mounting seat and is close to the passive layer of the bimetallic strip; the driving mechanism is connected with the second mounting seat; and the control system can receive the displacement transmitted by the displacement detection piece and the thrust transmitted by the thrust detection piece, and control the driving mechanism to drive the second mounting seat to move according to a preset mode. The bimetallic strip detection device can simultaneously detect the displacement and thrust of the bimetallic strip under a specific current, and provides data support for design and inspection work of a circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly to a bimetal detection device and a detection method. Background Art

[0002] The bimetal is an important component in a circuit breaker, mainly used for overload protection of an electrical circuit. During the operation of the circuit breaker, the bimetal is fixed in the form of a cantilever beam (i.e., one end of the bimetal is fixed and the other end can move freely). Once the current flowing through the circuit breaker exceeds the rated current or remains at the rated current for a long time, the temperature of the bimetal will increase over time. Due to a special manufacturing process, the two metals constituting the bimetal have different coefficients of thermal expansion. Therefore, when the bimetal is subjected to an overload current and its temperature rises, the metal sheet with a larger coefficient of thermal expansion will bend towards the side with a smaller coefficient of thermal expansion, thereby triggering a trip device to achieve the function of circuit breaking.

[0003] Therefore, when verifying the delay protection characteristics of a circuit breaker, it is extremely necessary to detect the deformation displacement and deformation thrust of the bimetal at a specific current multiple, such as the deformation displacement and deformation thrust of the bimetal at 1.13 times, 1.45 times, 2.55 times or multiple times the rated current. However, the current detection devices generally can only obtain the time-displacement curve or the time-thrust curve of the bimetal, or fit the time-displacement curve and the time-thrust curve to obtain the displacement-thrust curve. Although this method has achieved certain effects, the acquisition of displacement and thrust data is isolated, and it is impossible to completely determine whether the thrust can push the circuit breaker to trip when the bimetal reaches a certain displacement, which affects the design and verification work of the circuit breaker.

[0004] Therefore, there is an urgent need to propose a bimetal detection device and a detection method to solve the above technical problems. Summary of the Invention

[0005] According to one aspect of the present invention, the present invention provides a bimetal detection device, which can simultaneously detect the displacement and thrust of the bimetal at a specific current, and then fit the displacement-thrust curve of the bimetal, providing reliable data support for the design and inspection work of the circuit breaker.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The bimetal detection device includes:

[0008] A bottom plate;

[0009] A first mounting seat, arranged on the bottom plate, and a bimetal fixing part for mounting the bimetal is provided on the first mounting seat;

[0010] A displacement detection member, which is arranged on the first mounting seat and close to the active layer of the bimetal sheet, and is used to detect the displacement amount when the bimetal sheet deforms;

[0011] A second mounting seat, which is slidably connected to the bottom plate to approach or move away from the first mounting seat;

[0012] A thrust detection member, which is arranged on the second mounting seat and close to the passive layer of the bimetal sheet, and is used to detect the thrust when the bimetal sheet deforms;

[0013] A driving mechanism, which is arranged on the bottom plate and connected to the second mounting seat, and is used to drive the second mounting seat to move, so that the second mounting seat drives the thrust detection member to approach or move away from the bimetal sheet;

[0014] A control system, which is connected to the displacement detection member, the thrust detection member and the driving mechanism. The control system can receive the displacement amount transmitted by the displacement detection member and the thrust transmitted by the thrust detection member, and control the driving mechanism to drive the second mounting seat to move in a preset manner.

[0015] Optionally, the detection part of the displacement detection member, the deformation area of the bimetal sheet and the detection part of the thrust detection member are located on the same straight line.

[0016] Optionally, the bimetal fixing part includes:

[0017] A bimetal fixing seat, which is arranged on the first mounting seat. The top of the bimetal fixing seat is provided with a fixing groove and a threaded hole. One end of the bimetal sheet is inserted into the fixing groove, and the threaded hole communicates with the fixing groove;

[0018] A fastening screw, which is connected to the threaded hole and can press the bimetal sheet against the wall of the fixing groove.

[0019] Optionally, on the top of the bimetal fixing seat, a stop arm is arranged on one side of the fixing groove, and the bimetal sheet can abut against the stop arm.

[0020] Optionally, a contact support fixing part is further arranged on the first mounting seat. The contact support fixing part is used to mount a contact support, and the contact support is electrically connected to the bimetal sheet.

[0021] Optionally, the contact support fixing part includes a contact fixing seat. The contact fixing seat is arranged on the first mounting seat. The contact fixing seat is provided with a clamping groove, and the moving contact of the contact support is clamped in the clamping groove. A wire passing channel communicating the clamping groove and the outside is arranged inside the contact fixing seat, and an external wire is electrically connected to the moving contact through the wire passing channel.

[0022] Optionally, the card slot has openings at both the top and the side of the contact fixing seat. The end of the moving contact is clamped in the card slot through the opening. Moreover, a detachable cover plate is provided on the top of the contact fixing seat, and the cover plate abuts against the end of the moving contact to fix the moving contact in the card slot.

[0023] Optionally, a first bracket is provided on the first mounting seat. The first bracket is disposed opposite to the bimetal fixing portion. The displacement detection member is mounted on the first bracket. Moreover, the position of the displacement detection member on the first bracket is adjustable in the vertical direction so that the detection portion of the displacement detection member corresponds to the deformation area of the bimetal sheet.

[0024] Optionally, a second bracket is provided on the second mounting seat. The thrust detection member is mounted on the second bracket. Moreover, the position of the thrust detection member on the second bracket is adjustable in the vertical direction so that the detection portion of the thrust detection member corresponds to the deformation area of the bimetal sheet.

[0025] Optionally, the thrust detection member includes a pressure sensor and a detection rod. One end of the detection rod is connected to the pressure sensor, and the other end corresponds to the deformation area of the bimetal sheet. The pressure sensor detects the thrust when the bimetal sheet deforms through the detection rod.

[0026] Optionally, the driving mechanism includes:

[0027] A first lead screw seat and a second lead screw seat, both disposed on the bottom plate;

[0028] A lead screw, the first end of the lead screw is rotatably connected to the first lead screw seat, and the second end of the lead screw rotatably passes through the second lead screw seat;

[0029] A nut, connected to the lead screw. A through hole is provided on the second mounting seat, and the nut is in interference fit with the through hole;

[0030] A rotational driving member, disposed on the bottom plate and connected to the second end of the lead screw. The rotational driving member is used to control the lead screw to rotate in the preset manner according to the instruction of the control system.

[0031] Optionally, a slide rail extending along the movement direction of the second mounting seat is provided on the bottom plate. A slider is provided at the bottom of the second mounting seat, and the slider is slidably connected to the slide rail.

[0032] According to another aspect of the present invention, the present invention further provides a bimetal sheet detection method for detecting the relationship between the displacement amount and the thrust when the bimetal sheet deforms by using the bimetal sheet detection device according to any one of the above technical solutions. The bimetal sheet detection method includes:

[0033] S100. Apply a detection current to the bimetallic strip for a preset duration. The displacement detection component acquires the first displacement amount when the bimetallic strip deforms and transmits it to the control system in real time.

[0034] S200. The control system generates a time-displacement curve based on the received first displacement amount.

[0035] S300. The control system controls the drive mechanism to drive the second mounting seat to move towards the first mounting seat until the detection part of the thrust detection component fits with the deformation area of the bimetallic strip.

[0036] S400. Apply the detection current with the preset duration to the bimetallic strip again. Meanwhile, the control system controls the drive mechanism to drive the second mounting seat to move according to the time-displacement curve. The thrust detection component acquires the thrust when the bimetallic strip deforms and transmits it to the control system in real time. The displacement detection component acquires the second displacement amount when the bimetallic strip deforms and transmits it to the control system in real time.

[0037] S500. The control system generates a displacement-thrust curve graph based on the received thrust and the second displacement amount.

[0038] The beneficial effects of the present invention are as follows:

[0039] The present invention provides a bimetallic strip detection device, including a bottom plate, a first mounting seat, a displacement detection component, a second mounting seat, a thrust detection component, a drive mechanism, and a control system. When the bimetallic strip detection device works, first, the detection part of the thrust detection component is made to fit with the deformation area of the bimetallic strip. Then, the control system controls the drive mechanism to drive the second mounting seat to move, so that during the entire deformation process of the bimetallic strip, the thrust detection component and the displacement detection component can measure the thrust and displacement amount of the bimetallic strip in real time. The thrust and displacement amount of the bimetallic strip measured by this detection method are not isolated, but the thrust corresponding to the actual displacement amount during the deformation process of the bimetallic strip. The detection result is real, providing reliable data support for the design and inspection work of the circuit breaker.

[0040] The present invention also provides a bimetallic strip detection method, which uses the above bimetallic strip detection device to detect the relationship between the displacement amount and the deformation force of the bimetallic strip. The obtained displacement-thrust curve of the bimetallic strip is real and reliable, providing reliable data support for the design and inspection work of the circuit breaker. Description of the Drawings

[0041] Figure 1 It is a schematic structural diagram of a bimetallic strip in the prior art;

[0042] Figure 2Schematic structural diagram of the bimetal sheet detection device provided by the embodiment of the present invention;

[0043] Figure 3 Front view of the bimetal sheet detection device provided by the embodiment of the present invention;

[0044] Figure 4 Assembly drawing of the first mounting seat, bimetal sheet, contact support and displacement detection member provided by the embodiment of the present invention;

[0045] Figure 5 Assembly drawing of the first mounting seat and the first bracket provided by the embodiment of the present invention;

[0046] Figure 6 Cooperating diagram of the bimetal sheet and the contact support provided by the embodiment of the present invention;

[0047] Figure 7 Assembly drawing of the contact fixing seat and the contact support provided by the embodiment of the present invention;

[0048] Figure 8 Cross-sectional view of the contact fixing seat provided by the embodiment of the present invention;

[0049] Figure 9 Exploded schematic diagram of the second mounting seat, second bracket and nut provided by the embodiment of the present invention;

[0050] Figure 10 Schematic diagram when the displacement detection member and the thrust detection member start to detect provided by the embodiment of the present invention;

[0051] Figure 11 Flow chart of the bimetal sheet detection method provided by the embodiment of the present invention.

[0052] In the figure:

[0053] 10. Bimetal sheet; 11. Active layer; 12. Passive layer; 20. Contact support; 21. Moving contact; 30. Flexible connection; 40. Contact plate; 50. Terminal;

[0054] 100. Base plate; 110. Slide rail; 120. Slide block;

[0055] 200. First mounting seat; 210. Bimetal fixing part; 211. Bimetal fixing seat; 212. Fixing groove; 213. Threaded hole; 214. Tightening screw; 215. Stop arm; 220. Contact support fixing part; 221. Contact fixing seat; 222. Card slot; 223. Wire passing channel; 224. Cover plate; 225. Connection ear;

[0056] 300. Displacement detection member;

[0057] 400. Second mounting seat; 410. Through hole;

[0058] 500, Thrust detector; 510, Pressure sensor; 520, Detection rod;

[0059] 600, Driving mechanism; 610, First lead screw base; 620, Second lead screw base; 630, Lead screw; 640, Nut; 650, Rotating driving member; 660, Coupling;

[0060] 700, First bracket; 710, First long strip hole; 720, First bolt; 730, Second long strip hole; 740, Second bolt;

[0061] 800, Second bracket; 810, Third long strip hole; 820, Third bolt; 830, Fourth long strip hole; 840, Fourth bolt. Detailed implementation mode

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0064] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0066] Embodiment 1

[0067] As Figure 1 shown, the bimetallic strip 10 is formed by laminating two metal layers with different coefficients of thermal expansion. Generally, the metal layer with a larger coefficient of thermal expansion is called the active layer 11, and the metal layer with a smaller coefficient of thermal expansion is called the passive layer 12. When an overload current flows through, the Joule effect causes its temperature to rise. Due to the different degrees of thermal expansion of the active layer 11 and the passive layer 12, the bimetallic strip 10 will bend towards the side with a smaller coefficient of expansion, that is, towards the passive layer 12. When the bimetallic strip 10 bends to a certain extent, it can trigger the tripping mechanism to separate the moving and static contacts and cut off the circuit.

[0068] To verify the time-delay protection characteristic of the circuit breaker, it is extremely necessary to detect the displacement and thrust of the bimetallic strip 10 at a specific current multiple. However, the current detection devices generally can only obtain the time-displacement curve or the time-thrust curve of the bimetallic strip 10, or fit the time-displacement curve and the time-thrust curve to obtain the displacement-thrust curve. Although this method has achieved certain effects, the acquisition of displacement and thrust data is isolated, resulting in that although theoretically the thrust corresponding to a certain displacement of the bimetallic strip 10 can cause the circuit breaker to trip, in practice, the circuit breaker may not necessarily trip, which affects the design and verification work of the circuit breaker.

[0069] Based on the above problems, this embodiment provides a bimetallic strip detection device, which can simultaneously detect the displacement and thrust of the bimetallic strip 10 at a specific current, and then fit the displacement-thrust curve of the bimetallic strip 10, providing reliable data support for the design and inspection work of the circuit breaker.

[0070] Specifically, as Figures 2 - 4As shown in the figure, the bimetal detection device includes a bottom plate 100, a first mounting seat 200, a displacement detection member 300, a second mounting seat 400, a thrust detection member 500, a driving mechanism 600, and a control system. Among them, the first mounting seat 200 is arranged on the bottom plate 100, and a bimetal fixing portion 210 for mounting the bimetal 10 is provided on the first mounting seat 200. The displacement detection member 300 is arranged on the first mounting seat 200 and close to the active layer 11 of the bimetal 10, and is used to detect the displacement amount when the bimetal 10 deforms. The second mounting seat 400 is slidably connected to the bottom plate 100 to approach or move away from the first mounting seat 200. The thrust detection member 500 is arranged on the second mounting seat 400 and close to the passive layer 12 of the bimetal 10, and is used to detect the thrust when the bimetal 10 deforms. The driving mechanism 600 is arranged on the bottom plate 100 and connected to the second mounting seat 400, and is used to drive the second mounting seat 400 to move, so that the second mounting seat 400 drives the thrust detection member 500 to approach or move away from the bimetal 10. The control system is connected to the displacement detection member 300, the thrust detection member 500, and the driving mechanism 600. The control system can receive the displacement amount transmitted by the displacement detection member 300 and the thrust transmitted by the thrust detection member 500, and control the driving mechanism 600 to drive the second mounting seat 400 to move in a preset manner.

[0071] When using this bimetal detection device to detect the bimetal 10, first, the detection portion of the thrust detection member 500 is attached to the deformation area of the bimetal 10, and then a detection current is applied to the bimetal 10. After the bimetal 10 is energized and heated, it will bend towards the direction of the thrust detection member 500, applying a thrust to the thrust detection member 500. At the same time, the control system controls the driving mechanism 600 to drive the second mounting seat 400 to move in a preset manner, so that the second mounting seat 400 drives the thrust detection member 500 to move away from the bimetal 10. The preset manner should ensure that during the deformation process of the bimetal 10, the detection portion of the thrust detection member 500 is always attached to the deformation area of the bimetal 10. In this way, during the entire deformation process of the bimetal 10, the thrust detection member 500 and the displacement detection member 300 can obtain the thrust and displacement amount of the bimetal 10 in real time, and finally transmit them to the control system, and the control system generates a displacement-thrust curve of the bimetal 10. The thrust and displacement amount of the bimetal 10 measured by this detection method are not isolated, but the thrust corresponding to the actual displacement amount during the deformation process of the bimetal 10. The detection result is real, providing reliable data support for the design and inspection work of the circuit breaker.

[0072] In this embodiment, the displacement detector 300 and the bimetal 10 are both fixed on the first mounting base 200. Compared with fixing the bimetal 10 and the displacement detector 300 respectively through different fixing structures, the components are simplified and assembly is facilitated. Of course, in other embodiments, a third mounting base can also be separately provided for mounting the displacement detector 300, which can be set according to needs, and the present application does not make specific limitations.

[0073] Further, continue to refer to Figure 3 , the detection part of the displacement detector 300, the deformation area of the bimetal 10, and the detection part of the thrust detector 500 are located on the same straight line. With such a setting, the displacement detector 300 and the thrust detector 500 measure the same position of the bimetal 10, and the accuracy of the detection result is higher.

[0074] Further, continue to refer to Figure 4 and Figure 5 , the bimetal fixing part 210 includes a bimetal fixing seat 211 and a fastening screw 214. Among them, the bimetal fixing seat 211 is arranged on the first mounting base 200. A fixing groove 212 and a threaded hole 213 are provided at the top of the bimetal fixing seat 211. One end of the bimetal 10 is inserted into the fixing groove 212. The threaded hole 213 communicates with the fixing groove 212. The fastening screw 214 is connected to the threaded hole 213 and can press the bimetal 10 against the groove wall of the fixing groove 212.

[0075] When installing the bimetal 10, first hold the bimetal 10 by hand and insert the end of the bimetal 10 far from its deformation area into the fixing groove 212; then rotate the fastening screw 214 so that the fastening screw 214 gradually enters the fixing groove 212 until the end of the fastening screw 214 can clamp the bimetal 10 against the groove wall of the fixing groove 212.

[0076] When disassembling the bimetal 10, rotate the fastening screw 214 in the opposite direction so that the fastening screw 214 gradually disengages from the fixing groove 212. Until the fastening screw 214 loses the pressure on the bimetal 10, manually pull out the bimetal 10.

[0077] The bimetal fixing part 210 has a simple structure and is convenient for the installation and disassembly of the bimetal 10.

[0078] Optionally, continue to refer to Figure 5, on the top of the bimetal fixing base 211, a retaining arm 215 is provided on one side of the fixing groove 212, and the bimetal sheet 10 can abut against the retaining arm 215. By providing the retaining arm 215, the reliability of fixing the bimetal sheet 10 can be improved, and the installation position of the bimetal sheet 10 can be guided, so that after one installation, the position of the bimetal sheet 10 can correspond to the displacement detection member 300 and the thrust detection member 500, avoiding repeated adjustment during the installation of the bimetal sheet 10, greatly improving the installation efficiency of the bimetal sheet 10, and at the same time, reducing the installation difficulty of the bimetal sheet 10.

[0079] Optionally, the bimetal fixing base 211 can be fixed on the first mounting base 200 by means of threaded connection. Specifically, a screw passes through the bimetal fixing base 211 and is threadedly connected to the first mounting base 200. The structure is simple, convenient for assembly, and has good connection reliability.

[0080] As Figure 6 shown, the application of the detection current to the bimetal sheet 10 is generally realized through the contact plate 40 and the contact support 20. Specifically, one end of the bimetal sheet 10 far from the deformation zone is connected to the contact plate 40. A wiring terminal 50 is provided at the end of the contact plate 40, and the wiring terminal 50 is used for electrical connection with the first wire. The contact support 20 is located on one side of the bimetal sheet 10 and is electrically connected to the bimetal sheet 10 through a flexible connection 30. The moving contact 21 on the contact support 20 is electrically connected to the second wire. The first wire and the second wire are respectively connected to the positive and negative poles of the power supply, thereby forming a current loop to apply the required magnitude of detection current to the bimetal sheet 10. To protect the safety of the operator, the power supply generally uses a safety power supply device with a leakage protection function.

[0081] Based on the above structure, continue to refer to Figure 4 , in this embodiment, a contact support fixing portion 220 is further provided on the first mounting base 200, and the contact support fixing portion 220 is used for installing the contact support 20 for easy detection.

[0082] Optionally, as Figure 5 、 Figure 7 and Figure 8 shown, the contact support fixing portion 220 includes a contact fixing base 221. The contact fixing base 221 is provided on the first mounting base 200. A card slot 222 is provided on the contact fixing base 221. The moving contact 21 of the contact support 20 is snapped into the card slot 222. A wire passing channel 223 communicating the card slot 222 and the outside is provided inside the contact fixing base 221, and an external wire is electrically connected to the moving contact 21 through the wire passing channel 223. By using the card slot 222 to fix the contact support 20, the structure is simple and convenient for the installation and disassembly of the contact support 20. Moreover, the wire passing channel 223 is integrated inside the contact fixing base 221, which is convenient for the connection between the external wire and the moving contact 21 in the card slot 222.

[0083] It can be understood that the external wire is the aforementioned second wire.

[0084] Furthermore, continue to refer to Figure 8 , in this embodiment, the bottom of the contact fixing seat 221 has a first channel penetrating along its own thickness direction and a second channel extending along its own height direction and communicating with the card slot 222 and the first channel. The first channel and the second channel together form a wire threading channel 223. This setting not only facilitates the processing of the wire threading channel 223 but also enables the selection of the wire outlet direction as needed, with high flexibility in use.

[0085] It is worth noting that Figure 8 the direction indicated by the arrow in

[0086] Optionally, continue to refer to Figure 7 , in this embodiment, connecting ears 225 are provided on opposite sides of the bottom of the contact fixing seat 221, and the contact fixing seat 221 is mounted on the first mounting seat 200 through the connecting ears 225. Optionally, the connecting ears 225 can be connected to the first mounting seat 200 by means of threaded connection. Specifically, screws are passed through the connecting ears 255 and threadedly connected to the first mounting seat 200, with a simple structure, convenient installation and disassembly, and high connection strength.

[0087] Furthermore, continue to refer to Figure 4 、 Figure 5 and Figure 7 , in a possible embodiment, the card slot 222 has openings at both the top and the side of the contact fixing seat 221. The end of the moving contact 21 is snap-fitted into the card slot 222 through the opening, and a detachable cover plate 224 is provided on the top of the contact fixing seat 221. The cover plate 224 abuts against the end of the moving contact 21 to fix the moving contact 21 in the card slot 222. This setting not only facilitates the snap-fitting of the moving contact 21 with the card slot 222 but also enables the reliable fixing of the moving contact 21 through the cover plate 224.

[0088] Optionally, the cover plate 224 can be connected to the contact fixing seat 221 by means of threaded connection. Specifically, screws are passed through the cover plate 224 and threadedly connected to the contact fixing seat 221, with a simple structure, convenient installation and disassembly, and high connection strength.

[0089] Optionally, in other possible embodiments, the card slot 222 can also be opened on the side of the contact fixing part, that is, the card slot 222 has an opening only on the side of the contact fixing part, and the connection between the moving contact 21 and the card slot 222 is achieved through the interference fit between the moving contact 21 and the card slot 222.

[0090] Furthermore, continue to refer to Figures 2 - 5, a first support 700 is provided on the first mounting base 200. The first support 700 is disposed opposite to the bimetal fixing portion 210, and the displacement detector 300 is mounted on the first support 700. Fixing the displacement detector 300 through the first support 700 facilitates the installation of the displacement detector 300. Moreover, the position of the displacement detector 300 on the first support 700 is adjustable in the vertical direction so that the detection portion of the displacement detector 300 corresponds to the deformation area of the bimetal 10. By setting the position of the displacement detector 300 on the first support 700 to be adjustable in the vertical direction, on the one hand, the assembly accuracy between the displacement detector 300 and the bimetal 10 can be ensured to improve the accuracy of the detection result; on the other hand, bimetals 10 of different specifications can be adapted, and the universality is relatively high.

[0091] Optionally, continue to refer to Figure 4 and Figure 5 , in this embodiment, a first elongated hole 710 extending in the vertical direction is provided on the first support 700. A first bolt 720 passes through the displacement detector 300 and the first elongated hole 710 and is connected to a threaded fastener. With such a setting, when it is necessary to adjust the position of the displacement detector 300, loosen the threaded fastener so that the first bolt 720 can slide in the first elongated hole 710 and drive the displacement detector 300 to move. After the displacement detector 300 is adjusted in place, tighten the threaded fastener to fix the displacement detector 300. The structure is simple and the operation is convenient.

[0092] It can be understood that the displacement detector 300 can be selected but is not limited to a laser displacement sensor.

[0093] Furthermore, continue to refer to Figure 4 and Figure 5 , in a possible embodiment, the first support 700 is in an "L" shape, its horizontal section is connected to the first mounting base 200, and the vertical section is used to mount the displacement detector 300.

[0094] Optionally, continue to refer to Figure 4 and Figure 5 , in this embodiment, a second elongated hole 730 is provided on the horizontal section of the first support 700. The second elongated hole 730 extends along the width direction of the bimetal 10. A second bolt 740 passes through the second elongated hole 730 and is connected to the first mounting base 200. With such a setting, the installation position of the first support 700 can be adjusted along the extension direction of the second elongated hole 730 to ensure that the detection portion of the displacement detector 300 can face the deformation area of the bimetal 10, improving the accuracy of the detection result.

[0095] Further, in order to improve the connection strength between the first bracket 700 and the first mounting seat 200, a plurality of second elongated holes 730 may be provided on the horizontal section of the first bracket 700, and a second bolt 740 is correspondingly provided for each second elongated hole 730.

[0096] Further, as Figure 9 shown, a second bracket 800 is provided on the second mounting seat 400, and the thrust detection member 500 is mounted on the second bracket 800. The thrust detection member 500 is fixed by the second bracket 800, which facilitates the installation of the thrust detection member 500.

[0097] Moreover, the position of the thrust detection member 500 on the second bracket 800 is adjustable in the vertical direction, so that the detection portion of the thrust detection member 500 corresponds to the deformation area of the bimetal 10. By setting the position of the thrust detection member 500 on the second bracket 800 to be adjustable in the vertical direction, on the one hand, the assembly accuracy between the thrust detection member 500 and the bimetal 10 can be ensured to improve the accuracy of the detection result; on the other hand, different specifications of bimetals 10 can be adapted, and the universality is relatively high.

[0098] Optionally, referring further to Figure 9 , the thrust detection member 500 includes a pressure sensor 510 and a detection rod 520. One end of the detection rod 520 is connected to the pressure sensor 510, and the other end corresponds to the deformation area of the bimetal 10. The pressure sensor 510 detects the thrust when the bimetal 10 deforms through the detection rod 520. By providing the detection rod 520 to transmit the thrust when the bimetal 10 deforms to the pressure sensor 510, the detection is convenient.

[0099] Optionally, in this embodiment, one end of the detection rod 520 is threadedly connected to the pressure sensor 510. With this setting, it is convenient for the assembly of the detection rod 520 and the pressure sensor 510.

[0100] Further, referring further to Figure 9 , a third elongated hole 810 extending in the vertical direction is provided on the second bracket 800, and a third bolt 820 passes through the third elongated hole 810 and is connected to the thrust detection member 500. With this setting, when the position of the displacement detection member 300 needs to be adjusted, loosen the third bolt 820 so that the third bolt 820 can slide in the third elongated hole 810 and drive the thrust detection member 500 to move. When the thrust detection member 500 is adjusted in place, tighten the third bolt 820 to fix the thrust detection member 500. The structure is simple and the operation is convenient.

[0101] In this embodiment, the third bolt 820 passes through the third elongated hole 810 and is threadedly connected to the pressure sensor 510.

[0102] Further, referring further toFigure 9 In a possible embodiment, the second bracket 800 is in an "L" shape, the horizontal section of which is connected to the second mounting base 400, and the vertical section is used for mounting the thrust detector 500.

[0103] Optionally, continue to refer to Figure 9 In this embodiment, a fourth elongated hole 830 is provided on the horizontal section of the second bracket 800. The fourth elongated hole 830 extends along the sliding direction of the second mounting base 400. A fourth bolt 840 is passed through the fourth elongated hole 830 and connected to the second mounting base 400. With such a setting, the installation position of the second bracket 800 can be adjusted along the extension direction of the fourth elongated hole 830 to adjust the position of the second bracket 800 on the second mounting base 400.

[0104] Furthermore, in order to improve the connection strength between the second bracket 800 and the second mounting base 400, a plurality of fourth elongated holes 830 can be provided on the horizontal section of the second bracket 800, and at least one fourth bolt 840 is correspondingly provided for each fourth elongated hole 830.

[0105] Furthermore, continue to refer to Figure 1 , Figure 2 and Figure 9 The driving mechanism 600 includes a first lead screw base 610, a second lead screw base 620, a lead screw 630, a nut 640, and a rotation driving member 650. Among them, both the first lead screw base 610 and the second lead screw base 620 are provided on the bottom plate 100. The first end of the lead screw 630 is rotatably connected to the first lead screw base 610, and the second end of the lead screw 630 rotatably passes through the second lead screw base 620. The nut 640 is connected to the lead screw 630. A through hole 410 is provided on the second mounting base 400, and the nut 640 is in interference fit with the through hole 410. The rotation driving member 650 is provided on the bottom plate 100 and connected to the second end of the lead screw 630. The rotation driving member 650 is used to control the lead screw 630 to rotate in a preset manner according to the instructions of the control system. When the driving member controls the lead screw 630 to rotate, the nut 640 provided on the lead screw 630 will move horizontally and drive the second mounting base 400 connected thereto to move. The movement of the second mounting base 400 is controlled through a lead screw-nut structure, and the control accuracy is relatively high. Moreover, the driving mechanism 600 has a simple structure and is also convenient to control.

[0106] It can be understood that the nut 640 can also be installed in the through hole 410 and fixed to the second mounting base 400 by means of bolt connection, which can be set according to actual needs, and the present application does not make specific limitations.

[0107] Optionally, continue to refer to Figure 2 and Figure 3, in this embodiment, the first mounting seat 200 is close to the second lead screw seat 620 and is located between the first lead screw seat 610 and the second lead screw seat 620.

[0108] Optionally, referring further to Figure 2 and Figure 3 , the rotating drive member 650 can be connected to the lead screw 630 through a coupling 660.

[0109] Optionally, the rotating drive member 650 can be a servo motor.

[0110] Optionally, bearings (not shown in the figure) can be provided on both the first lead screw seat 610 and the second lead screw seat 620, and the lead screw 630 is connected to the bearings on the first lead screw seat 610 and the bearings on the second lead screw seat 620. With such a setting, the smoothness of the rotation of the lead screw 630 can be improved.

[0111] Further, referring further to Figure 2 and Figure 3 , a slide rail 110 extending along the movement direction of the second mounting seat 400 is provided on the bottom plate 100, and a slider 120 is provided at the bottom of the second mounting seat 400. The slider 120 is slidably connected to the slide rail 110. The sliding connection between the second mounting seat 400 and the bottom plate 100 is realized through the cooperation of the slide rail 110 and the slider 120, and the structure is simple and the sliding smoothness is better.

[0112] Optionally, in this embodiment, slide rails 110 are provided on both sides in the width direction of the bottom plate 100, and sliders 120 corresponding to the slide rails 110 are provided on opposite sides of the second mounting seat 400.

[0113] Embodiment 2

[0114] This embodiment provides a bimetal detection method, which uses the bimetal detection device of Embodiment 1 to detect the relationship between the displacement and the thrust when the bimetal 10 deforms. The obtained displacement-thrust curve of the bimetal 10 is true and reliable, providing reliable data support for the design and inspection of the circuit breaker.

[0115] Specifically, as Figure 10 and Figure 11 shown, the bimetal detection method includes the following steps:

[0116] S100. Apply a detection current with a preset duration to the bimetal 10, and the displacement detection member 300 acquires the first displacement amount when the bimetal 10 deforms and transmits it to the control system in real time;

[0117] S200. The control system generates a time-displacement curve according to the received first displacement amount;

[0118] S300. The control system controls the driving mechanism 600 to drive the second mounting seat 400 to move towards the first mounting seat 200 until the detection part of the thrust detector 500 is in contact with the deformation area of the bimetallic strip 10 (see Figure 10 ).

[0119] S400. Apply the detection current for a preset duration to the bimetallic strip 10 again. Meanwhile, the control system controls the driving mechanism 600 to drive the second mounting seat 400 to move according to the time-displacement curve. The thrust detector 500 acquires the thrust when the bimetallic strip 10 deforms and transmits it to the control system in real time, and the displacement detector 300 acquires the second displacement amount when the bimetallic strip 10 deforms and transmits it to the control system in real time.

[0120] S500. The control system generates a displacement-thrust curve graph based on the received thrust and the second displacement amount.

[0121] In the bimetallic strip detection method provided in this embodiment, first, the time-displacement curve of the bimetallic strip 10 under the detection current for a preset duration is detected separately. Then, the same detection conditions are applied to the metal strip again, and the thrust detector 500 is controlled to move away from the bimetallic strip 10 according to the deformation characteristics of the bimetallic strip 10 in this detection environment. In this way, the data detected by the thrust detector 500 and the displacement detector 300 are more accurate and reliable.

[0122] It can be understood that the detection current can be 1.13 times, 1.45 times, 2.55 times or multiple times of the rated current.

[0123] It can be understood that after step S500, the current applied to the bimetallic strip 10 can be cut off and the machine can be stopped. The bimetallic strip 10 is detected again using different detection currents to obtain a displacement-thrust curve under another detection current.

[0124] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Bimetallic strip detection device, characterized in that: include: Bottom plate (100); A first mounting seat (200) is arranged on the bottom plate (100), wherein the first mounting seat (200) is provided with a bimetal fixing portion (210) for mounting the bimetallic strip (10); a displacement detection member (300) disposed on the first mounting seat (200) and close to the active layer (11) of the bimetallic strip (10), and used for detecting the displacement of the bimetallic strip (10) when it is deformed; A second mounting seat (400) is slidably connected to the base plate (100) to move closer to or farther away from the first mounting seat (200); A thrust detection member (500) is arranged on the second mounting seat (400) and close to the passive layer (12) of the bimetallic strip (10), and is used to detect the thrust when the bimetallic strip (10) is deformed; a driving mechanism (600), arranged on the bottom plate (100) and connected to the second mounting seat (400), and used for driving the second mounting seat (400) to move, so that the second mounting seat (400) drives the thrust detection member (500) to move closer to or farther from the bimetallic strip (10); A control system is connected to the displacement detection member (300), the thrust detection member (500) and the drive mechanism (600), and the control system is capable of receiving the displacement transmitted by the displacement detection member (300) and the thrust transmitted by the thrust detection member (500), and controlling the drive mechanism (600) to drive the second mounting seat (400) to move in a preset manner.

2. The bimetallic strip detection device according to claim 1, characterized in that: The detection portion of the displacement detection member (300), the deformation zone of the bimetallic strip (10) and the detection portion of the thrust detection member (500) are located on the same straight line.

3. The bimetallic strip detection device according to claim 1, characterized in that: The double metal fixing part (210) comprises: A bimetal fixing seat (211) is arranged on the first mounting seat (200), a fixing groove (212) and a threaded hole (213) are arranged on the top of the bimetal fixing seat (211), one end of the bimetallic strip (10) is inserted into the fixing groove (212), and the threaded hole (213) is connected to the fixing groove (212); A fastening screw (214), the fastening screw (214) is connected to the threaded hole (213) and is capable of pressing the bimetallic strip (10) against the groove wall of the fixing groove (212).

4. The bimetallic strip detection device according to claim 3, characterized in that: A blocking arm (215) is provided on the top of the bimetal fixing seat (211) and on one side of the fixing groove (212), and the bimetallic strip (10) can abut against the blocking arm (215).

5. The bimetallic strip detection device according to claim 1, characterized in that: The first mounting seat (200) is also provided with a contact support fixing portion (220), and the contact support fixing portion (220) is used to install a contact support (20), and the contact support (20) is electrically connected to the bimetallic strip (10).

6. The bimetallic strip detection device according to claim 5, characterized in that: The contact support fixing portion (220) comprises a contact fixing seat (221), the contact fixing seat (221) is arranged on the first mounting seat (200), a clamping slot (222) is provided on the contact fixing seat (221), a movable contact (21) of the contact support (20) is clamped in the clamping slot (222), a wire threading channel (223) connecting the clamping slot (222) and the outside is provided inside the contact fixing seat (221), and an external wire is electrically connected to the movable contact (21) through the wire threading channel (223).

7. The bimetallic strip detection device according to claim 6, characterized in that: The slot (222) has openings at the top and side of the contact fixing seat (221); the end of the moving contact (21) is snap-connected to the slot (222) through the opening; and a detachable cover plate (224) is provided on the top of the contact fixing seat (221); the cover plate (224) abuts against the end of the moving contact (21) to fix the moving contact (21) in the slot (222).

8. The bimetallic strip detection device according to claim 1, characterized in that: A first bracket (700) is provided on the first mounting seat (200), the first bracket (700) is arranged opposite to the bimetal fixing portion (210), the displacement detecting member (300) is mounted on the first bracket (700), and the position of the displacement detecting member (300) on the first bracket (700) along the vertical direction is adjustable so that the detection portion of the displacement detecting member (300) corresponds to the deformation zone of the bimetallic strip (10).

9. The bimetallic strip detection device according to claim 1, characterized in that: A second bracket (800) is provided on the second mounting seat (400), the thrust detection member (500) is mounted on the second bracket (800), and the position of the thrust detection member (500) on the second bracket (800) is adjustable in a vertical direction so that a detection portion of the thrust detection member (500) corresponds to a deformation zone of the bimetallic strip (10).

10. The bimetallic strip detection device according to claim 1, characterized in that: The thrust detection member (500) comprises a pressure sensor (510) and a detection rod (520); one end of the detection rod (520) is connected to the pressure sensor (510), and the other end corresponds to the deformation zone of the bimetallic strip (10); the pressure sensor (510) detects the thrust of the bimetallic strip (10) when it is deformed through the detection rod (520).

11. The bimetallic strip detection device according to claim 1, characterized in that: The driving mechanism (600) comprises: A first screw seat (610) and a second screw seat (620) are both arranged on the base plate (100); A lead screw (630), wherein a first end of the lead screw (630) is rotatably connected to the first lead screw seat (610), and a second end of the lead screw (630) is rotatably disposed through the second lead screw seat (620); A nut (640) connected to the lead screw (630); a through hole (410) is provided on the second mounting seat (400); and the nut (640) is interference-fitted with the through hole (410); A rotation driving member (650) is arranged on the base plate (100) and connected to the second end of the lead screw (630), and the rotation driving member (650) is used to control the lead screw (630) to rotate in the preset manner according to the instructions of the control system.

12. The bimetallic strip detection device according to any one of claims 1 to 11, characterized in that: The bottom plate (100) is provided with a slide rail (110) extending along the movement direction of the second mounting seat (400), and the bottom of the second mounting seat (400) is provided with a slider (120), and the slider (120) is slidably connected to the slide rail (110).

13. A bimetallic strip detection method, using the bimetallic strip detection device according to any one of claims 1 to 12 to detect the relationship between the displacement and thrust of the bimetallic strip (10) when it is deformed, characterized in that: The bimetallic strip detection method comprises: S100, applying a detection current of a preset duration to the bimetallic strip (10), so that the displacement detection component (300) obtains a first displacement amount when the bimetallic strip (10) is deformed and transmits it to the control system in real time; S200, the control system generates a time-displacement curve according to the received first displacement; S300, the control system controls the driving mechanism (600) to drive the second mounting seat (400) to move in a direction close to the first mounting seat (200) until the detection portion of the thrust detection member (500) fits the deformation area of ​​the bimetallic strip (10); S400, the detection current of the preset time length is applied to the bimetallic strip (10) again, and at the same time, the control system controls the driving mechanism (600) to drive the second mounting seat (400) to move according to the time-displacement curve, the thrust detection component (500) obtains the thrust when the bimetallic strip (10) is deformed and transmits it to the control system in real time, and the displacement detection component (300) obtains the second displacement when the bimetallic strip (10) is deformed and transmits it to the control system in real time; S500: The control system generates a displacement-thrust curve diagram according to the received thrust and the second displacement.

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