Molded case circuit breaker instantaneous tripping characteristic verification clamp device

Abstract

The utility model discloses a molded case circuit breaker instantaneous tripping characteristic verification clamp device comprising a verification bench and a positioning mechanism, and a test station of the verification bench is provided with a plurality of motion guide holes; the positioning mechanism comprises a plurality of groups of clamping structures which are respectively arranged in the plurality of movement guide holes, each group of clamping structure comprises two clamping hooks which are oppositely arranged in each movement guide hole and an elastic locking piece which is arranged on one of the clamping hooks, and the circuit breaker is fixed on a test station through the clamping hooks. The elastic locking piece can be driven by the clamping hook to abut against a moving contact of the circuit breaker in a matched mode, so that locking force which keeps making contact with a static contact is applied to the moving contact, and the purpose that the moving contact and the static contact are prevented from being disconnected instantly when the molded case circuit breaker is subjected to an instantaneous tripping characteristic verification test is achieved. Therefore, bounce and arc discharge between the moving contact and the static contact are avoided, the contacts are well protected, and the service life of the product is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a check fixture technical field, concretely relates to a moulded case circuit breaker transient tripping characteristic check fixture equipment. BACKGROUND

[0002] Moulded case circuit breaker as the important electrical equipment of protection circuit system, when the short circuit, overload, under voltage etc. of circuit appear, the circuit breaker will cut off the current actively, thereby protecting the safety of distribution system, electrical equipment and staff.

[0003] The existing moulded case circuit breaker after assembling, in order to guarantee the quality of product, needs to carry out the check test to its transient tripping characteristic, and the transient tripping of circuit breaker is triggered by electromagnetic tripping mechanism, and when the circuit breaker is fixed on the test bench through the fixture and carries out the test of electrification, needs to close the circuit breaker to keep the dynamic contact and static contact closed contact, and the electromagnetic tripping mechanism will trigger the transient tripping action of circuit breaker when the input current reaches the transient tripping requirement, at this time, the dynamic contact and static contact are disconnected instantaneously due to the tripping of the internal mechanism of circuit breaker, which causes the bounce and arc phenomenon of contact in the test process, and causes the burning damage of contact, thereby reducing the service life of product. Therefore, the technical personnel in the art need to develop and design a check fixture equipment which can avoid the instantaneous disconnection of dynamic contact and static contact while realizing the check test of the transient tripping characteristic of circuit breaker. UTILITY MODEL CONTENT

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the instantaneous disconnection of dynamic contact and static contact when the circuit breaker is checked and tested in the prior art, which causes the bounce and arc phenomenon of contact in the check test process of circuit breaker, causes the burning damage of contact, thereby reducing the service life of product.

[0005] To solve the above technical problems, the utility model provides a moulded case circuit breaker transient tripping characteristic check fixture equipment, which comprises:

[0006] The check table comprises a plurality of test stations for placing circuit breakers and a plurality of movement guide holes arranged at intervals in each test station.

[0007] The positioning mechanism comprises a plurality of clamping structures movably arranged in the plurality of movement guide holes, each clamping structure comprising two clamping hooks oppositely arranged in each movement guide hole and an elastic locking member arranged on one of the clamping hooks, and forming a clamping interval suitable for accommodating the circuit breaker between the two clamping hooks. The two clamping hooks have a first state of clamping and locking at both ends of the circuit breaker and a second state of loosening and separating from both ends of the circuit breaker. When the clamping hooks are in the first state, the elastic locking member is pressed against the dynamic contact of the circuit breaker, and the elastic locking member applies a locking force to the dynamic contact to keep the dynamic contact in contact with the static contact.

[0008] As a preferred solution, the elastic locking piece comprises a support frame fixed on the top of the clamping hook, and an elastic pressing rod movably arranged on the support frame and staggered with the clamping hook in the vertical direction.

[0009] As a preferred solution, the top of the clamping hook is provided with a pressing block part extending in the first direction for a certain length, the support frame comprises a vertical rod part detachably fixed on the pressing block part, and a horizontal rod part connected with the vertical rod part and extending in the first direction, the horizontal rod part is arranged in parallel above the pressing block part, the length of the horizontal rod part is greater than the length of the pressing block part, and the elastic pressing rod is arranged on the horizontal rod part and located outside one end of the pressing block part.

[0010] As a preferred solution, the support frame is connected with the clamping hook in an F-shaped structure.

[0011] As a preferred solution, the vertical height of the elastic pressing rod to the verification table is greater than the vertical height of the pressing block part to the verification table.

[0012] As a preferred solution, the elastic pressing rod comprises a pressing rod penetrating through the horizontal rod part in a direction perpendicular to the first direction, and a compression spring structure sleeved on the pressing rod, the lower end of the pressing rod is provided with a pressing disc, the two ends of the compression spring structure are respectively limited to abut against the pressing disc and the lower side of the horizontal rod part, and the upper end of the upper side of the horizontal rod part is provided with a limiting structure penetrating through the pressing rod.

[0013] As a preferred solution, the horizontal rod part is provided with a through hole through which the pressing rod penetrates, and the limiting structure is a limiting nut threadedly connected on the upper end of the pressing rod; or the limiting structure is a limiting pin penetrating through the upper end of the pressing rod.

[0014] As a preferred solution, the horizontal rod part can be adjusted in length in the first direction through an adjusting structure.

[0015] As a preferred solution, the movement guide hole is a strip-shaped through hole extending on the verification table, and the first direction is the length extension direction of the movement guide hole.

[0016] As a preferred solution, the bottom side of the verification table is provided with a containing groove, and the positioning mechanism comprises a cylinder structure arranged in the containing groove and connected with multiple sets of clamping structures, and the cylinder structure drives the clamping hook to reciprocate in the movement guide hole.

[0017] Compared with the prior art, the technical scheme of the utility model has the following advantages:

[0018] 1. The plastic shell circuit breaker instantaneous tripping characteristic verification fixture device provided by the utility model, a plurality of groups of clamping structures are arranged in the plurality of movement guide holes of the verification table, each group of two clamping hooks is composed of two clamping hooks and an elastic locking piece arranged on one of the clamping hooks, the circuit breaker is placed on the test station, the two clamping hooks of each group of clamping structures are relatively clamped and pressed on both ends of the circuit breaker, so that the circuit breaker is fixed on the test station, and the elastic locking piece is cooperatively pressed on the moving contact of the circuit breaker under the driving of the clamping hook, so that the locking force of the moving contact maintaining contact with the static contact is applied, which can ensure that the moving contact does not rotate due to the tripping of the circuit breaker when the instantaneous tripping action verification of the circuit breaker is completed, thereby achieving the purpose of preventing the moving contact and the static contact from being disconnected instantaneously when the plastic shell circuit breaker is tested for instantaneous tripping characteristic verification, avoiding the bouncing and arcing phenomenon between the moving contact and the static contact, protecting the contacts well, prolonging the service life of the product, and the verification device adopting the technical scheme can meet the demand of the plastic shell circuit breaker instantaneous tripping characteristic verification test.

[0019] 2. In the plastic shell circuit breaker instantaneous tripping characteristic verification fixture device, the support frame is connected with the clamping hook in an F-shaped structure, the length of the cross rod part of the support frame is greater than the length of the pressing block part of the clamping hook, the elastic pressing rod is arranged on the cross rod part and located at one end outside the pressing block part, the design makes the elastic pressing rod and the clamping hook vertically staggered to avoid position interference, when the clamping hook is pressed on one end of the circuit breaker, the elastic pressing rod is correspondingly pressed on the moving contact, the elastic pressure of the elastic pressing rod maintains the closed contact state of the moving contact and the static contact, that is, the position of the moving contact is limited and locked, the instantaneous separation and disconnection of the moving contact and the static contact caused by the instantaneous tripping action of the circuit breaker are avoided, and the safety of the instantaneous tripping characteristic verification test of the circuit breaker is ensured.

[0020] 3. In the plastic shell circuit breaker instantaneous tripping characteristic verification fixture device, the elastic pressing rod is composed of a pressing rod, a compression spring structure and a limiting structure, the compression spring structure is sleeved on the pressing rod, and the limiting structure is preferably a limiting nut arranged at the upper end of the pressing rod, the limiting nut can limit and connect the pressing rod penetrating through the cross rod part and adjust the pressure of the compression spring structure, the elastic pressing rod is pressed and contacted on the moving contact through the pressing rod under the driving of the clamping hook, the compression spring structure is elastically deformed under the extrusion of the pressing rod, the compression spring structure elastically compensates the pressing rod, thereby realizing the elastic extrusion contact between the pressing rod and the moving contact, ensuring that the moving contact maintains closed contact with the static contact under the pressing action of the elastic pressing rod, and meeting the requirement that the moving contact and the static contact are not disconnected instantaneously when the circuit breaker is tested for instantaneous tripping characteristic verification. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description.

[0022] Figure 1 It is a perspective view of the instant trip characteristic verification fixture device for the molded case circuit breaker of the present application.

[0023] Figure 2 It is a side view of the instant trip characteristic verification fixture device for the molded case circuit breaker of the present application.

[0024] Figure 3 It is a structural schematic view of the clamping assembly of the present application.

[0025] Figure 4 It is a sectional structural schematic view of the clamping assembly of the present application.

[0026] The reference signs are explained as follows: 1, verification table; 2, moving guide hole; 3, clamping hook; 31, pressing block part; 4, elastic locking part; 41, support frame; 411, vertical rod part; 412, horizontal rod part; 42, elastic pressing rod; 421, pressing rod; 422, compression spring structure; 423, limiting nut; 424, pressing disc; 5, clamping interval. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0028] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] EMBODIMENT

[0031] The present embodiment will be described in detail in combination with the drawings as follows:

[0032] The embodiment provides a kind of moulded case circuit breaker transient tripping characteristic verification fixture equipment as shown in Figures 1-4 The embodiment provides a kind of moulded case circuit breaker transient tripping characteristic verification fixture equipment as shown in The positioning mechanism includes multiple sets of clamping structures movably arranged in multiple movement guide holes 2, each set of clamping structures includes two clamping hooks 3 oppositely arranged in each movement guide hole 2, and a elastic locking piece 4 arranged on one of the clamping hooks 3, and a clamping interval 5 suitable for accommodating the circuit breaker is formed between the two clamping hooks 3, the two clamping hooks 3 have a first state of clamping and locking relative to the two ends of the circuit breaker, and a second state of loosening and separating from the two ends of the circuit breaker, the clamping hooks 3 drive the elastic locking piece 4 to abut against the movable contact of the circuit breaker in the first state, so that the elastic locking piece 4 applies a locking force to the movable contact to keep the movable contact in contact with the static contact.

[0033] The above embodiment is the core technical solution of the embodiment, and multiple sets of clamping structures are arranged in multiple movement guide holes 2 of the verification table 1, each set of clamping structures includes two clamping hooks 3, the circuit breaker is placed on the test station, and the two clamping hooks 3 of each set of clamping structures are clamped and abut against the two ends of the circuit breaker, so that the circuit breaker is fixed on the test station, and the elastic locking piece 4 is abutted against the movable contact of the circuit breaker under the driving of the clamping hooks 3, so that the elastic locking piece 4 applies a locking force to the movable contact to keep the movable contact in contact with the static contact. When the circuit breaker completes the transient tripping action verification, the movable contact will not rotate due to the tripping of the circuit breaker because it is pressed by the elastic locking piece 4, so that the purpose of preventing the movable contact and the static contact from being disconnected instantaneously is achieved when the moulded case circuit breaker performs the transient tripping characteristic verification test, the bouncing and arcing phenomenon between the movable contact and the static contact is avoided, the contacts are well protected, the service life of the product is prolonged, and the verification fixture equipment adopting the technical solution can meet the needs of the moulded case circuit breaker transient tripping characteristic verification test.

[0034] The following will be combined Figures 1-4 The specific arrangement of the elastic locking piece 4 will be described in detail as follows:

[0035] The elastic locking piece 4 comprises a support frame 41 fixed on the top of the clamping hook 3, and an elastic pressing rod 42 movably arranged on the support frame 41 and staggered with the clamping hook 3 in the up-down direction. Further preferably, the top of the clamping hook 3 is provided with a pressing block part 31 extending in the first direction with a certain length, the support frame 41 comprises a vertical rod part 411 detachably fixed on the pressing block part 31, and a horizontal rod part 412 connected with the vertical rod part 411 and extending in the first direction, the vertical rod part and the horizontal rod part are detachably connected or integrally formed, the horizontal rod part 412 is arranged above the pressing block part 31 in parallel, the length of the horizontal rod part 412 is greater than the length of the pressing block part 31, and the elastic pressing rod 42 is arranged on the horizontal rod part 412 and located outside one end of the pressing block part 31, so that the support frame 41 and the clamping hook 3 are connected in an F-shaped structure, the vertical height of the elastic pressing rod 42 to the calibration table 1 is greater than the vertical height of the pressing block part 31 to the calibration table 1, so that the elastic pressing rod 42 and the clamping hook 3 are staggered in the up-down direction to avoid position interference, when the clamping hook 3 is pressed on one end of the circuit breaker, the elastic pressing rod 42 is correspondingly pressed on the moving contact, the elastic pressing force of the elastic pressing rod 42 keeps the moving contact and the static contact in a closed contact state, that is, the position of the moving contact is limited and locked, so that the instantaneous separation of the moving contact and the static contact caused by the instantaneous tripping action of the circuit breaker is avoided, and the safety of the calibration test of the instantaneous tripping characteristics of the circuit breaker is ensured.

[0036] As Figures 3-4As shown, the elastic pressure rod 42 comprises a pressure rod 421 arranged on the cross rod portion 412 in a direction perpendicular to the first direction, and a compression spring structure 422 sleeved on the pressure rod 421, the lower end of the pressure rod 421 is provided with a pressure disc 424, the two ends of the compression spring structure 422 are respectively limited to abut against the pressure disc 424 and the lower side of the cross rod portion 412, the cross rod portion 412 is provided with a through hole for the pressure rod 421 to pass through, the upper end of the pressure rod 421 passing through the upper side of the cross rod portion 412 is provided with a limiting structure, the pressure disc 424 is in a circular structure, and through the above structure, it can be known that the elastic pressure rod 42 is composed of the pressure rod 421, the compression spring structure 422 and the limiting structure, the limiting structure is preferably a limiting nut 423 threadedly connected to the upper end of the pressure rod 421, the limiting nut 423 abuts against the upper side of the cross rod portion 412 under the elastic force of the compression spring structure 422, so that the limiting nut 423 can not only play a limiting connection role on the pressure rod 421 arranged on the cross rod portion, but also can adjust the pressure of the compression spring structure, and the elastic pressure rod 42 is driven by the clamping hook 3 to abut against and contact the moving contact, the compression spring structure 422 is elastically deformed under the extrusion of the pressure rod 421, and the pressure rod plays an elastic compensation role through the compression spring structure 422, so as to realize the elastic extrusion contact between the pressure rod and the moving contact, and ensure that the moving contact keeps closed contact with the static contact under the abutting role of the elastic pressure rod, so as to meet the requirement that the moving contact and the static contact are not instantaneously disconnected when the circuit breaker meets the instantaneous tripping characteristic calibration test.

[0037] As an alternative to the above-mentioned limiting structure, the limiting structure is a limiting pin inserted into the upper end of the pressure rod 421, and a pin hole is arranged in the radial direction of the upper end of the pressure rod 421 for the limiting pin to pass through, the limiting pin plays a limiting connection role on the pressure rod 421 in the cross rod portion 412, and the limiting pin abuts against the upper side of the cross rod portion 412 under the force of the compression spring, thereby playing a limiting connection role on the pressure rod 421 in the support frame 41, and those skilled in the art can select the specific structure of the limiting structure according to the above description, and other equivalent embodiments will not be described here.

[0038] In the embodiment, the cross rod portion 412 can be extended and adjusted in length in the first direction through an adjusting structure, the adjusting structure can adopt a threaded adjusting or sliding adjusting mode, the cross rod portion 412 is composed of two rod members connected in a sliding mode, or the cross rod portion 412 is composed of two rod members connected in a threaded mode, so as to achieve the purpose of adjusting the length of the cross rod portion, which can better adapt to the use of moving contacts of different types of circuit breakers.

[0039] In the embodiment, as shown in Figures 1-2As shown, the movement guide hole 2 is a strip-shaped through hole arranged on the calibration table 1, and the first direction is the length extension direction of the movement guide hole 2, wherein the bottom side of the calibration table 1 is provided with a containing groove, and the positioning mechanism comprises a cylinder structure arranged in the containing groove and connected with multiple groups of clamping structures, the cylinder structure drives the clamping hooks 3 to make reciprocating movement in the movement guide hole 2, specifically, the clamping hooks 3 can make horizontal movement along the first direction under the driving of the cylinder structure, and can also make vertical movement perpendicular to the first direction, so that the two clamping hooks 3 are clamped and fixed at the wire connection ports on both ends of the circuit breaker, and the two clamping hooks 3 specifically clamp and press against the wire connection ports on both ends of the circuit breaker, so as to realize the installation and fixation of the circuit breaker on the calibration table test station.

[0040] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A fixture for verifying the instantaneous tripping characteristics of a molded case circuit breaker, characterized in that, include: The test bench (1) includes multiple test stations for placing circuit breakers and multiple motion guide holes (2) spaced apart at each of the test stations; The positioning mechanism includes multiple sets of clamping structures that are movably disposed in multiple motion guide holes (2). Each set of clamping structures includes two clamping hooks (3) disposed opposite to each motion guide hole (2) and an elastic locking member (4) disposed on one of the clamping hooks (3). A clamping interval (5) suitable for accommodating the circuit breaker is formed between the two clamping hooks (3). The two clamping hooks (3) have a first state in which they are clamped and locked at both ends of the circuit breaker, and a second state in which they are released and disengaged from both ends of the circuit breaker. In the first state, the clamping hook (3) drives the elastic locking member (4) to cooperate and press against the moving contact of the circuit breaker, so that the elastic locking member (4) applies a locking force to the moving contact to keep it in contact with the stationary contact.

2. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 1, characterized in that: The elastic locking member (4) includes a support frame (41) fixed to the top of the clamping hook (3) and an elastic pressure rod (42) movably disposed on the support frame (41) and offset vertically from the clamping hook (3).

3. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 2, characterized in that: The clamping hook (3) is provided with a pressure block (31) extending a predetermined length in a first direction at its top. The support frame (41) includes a vertical rod (411) detachably fixed to the pressure block (31) and a horizontal rod (412) connected to the vertical rod (411) and extending in the first direction. The horizontal rod (412) is arranged parallel above the pressure block (31). The length of the horizontal rod (412) is greater than the length of the pressure block (31). The elastic pressure bar (42) is arranged on the horizontal rod (412) and located outside one end of the pressure block (31).

4. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 3, characterized in that: The support frame (41) is connected to the clamping hook (3) in an F-shaped structure.

5. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 4, characterized in that: The vertical height of the elastic pressure bar (42) to the test platform (1) is greater than the vertical height of the pressure block (31) to the test platform (1).

6. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to any one of claims 3-5, characterized in that: The elastic pressure bar (42) includes a pressure bar (421) that passes through the crossbar portion (412) perpendicular to the first direction, and a compression spring structure (422) sleeved on the pressure bar (421). The lower end of the pressure bar (421) is provided with a pressure plate (424). The two ends of the compression spring structure (422) are respectively restricted to abutting against the pressure plate (424) and the lower side of the crossbar portion (412). The upper end of the pressure bar (421) passing through the upper side of the crossbar portion (412) is provided with a limiting structure.

7. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 6, characterized in that: The crossbar portion (412) is provided with a through hole through which the pressure rod (421) can pass. The limiting structure is a limiting nut (423) threadedly connected to the upper end of the pressure rod (421); or the limiting structure is a limiting pin inserted into the upper end of the pressure rod (421).

8. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 6, characterized in that: The crossbar (412) can be extended in the first direction to adjust its length through an adjustment structure.

9. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 1, characterized in that: The motion guide hole (2) is a strip-shaped through hole extending on the calibration table (1), and the length extension direction of the motion guide hole (2) is a first direction.

10. The fixture equipment for verifying the instantaneous tripping characteristics of molded case circuit breakers according to claim 9, characterized in that: The bottom side of the calibration table (1) is provided with a receiving groove. The positioning mechanism includes a cylinder structure that is set in the receiving groove and connected to multiple clamping structures. The cylinder structure drives the clamping hook (3) to reciprocate in the motion guide hole (2).

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