Protection switch device for electric power measurement universal meter

Abstract

The invention discloses a protection switch device for an electric power measurement universal meter, which comprises a universal meter outer frame, a universal meter circuit board arranged in the universal meter outer frame, a protection structure arranged on the back side of the universal meter circuit board, an outer frame back plate arranged on the back side of the universal meter outer frame, and a sliding groove formed in the position, corresponding to the protection structure, of the outer frame back plate. And a structure switch is arranged in the sliding groove. The invention relates to the technical field of universal meter protection equipment. According to the protection switch device for the electric power measurement multimeter, when the current in a circuit measured by the multimeter is larger than the measuring range of the multimeter, the large current passes through the conductive coil, the magnetic field generated by the conductive coil is increased, the sliding block is attracted to push the ejector pin to move, the locking rod is pushed out of the locking groove through the ejector pin, and therefore locking of the extension table is relieved; at the moment, the extension table is separated from the conductive plate under the influence of the extension spring, so that the loop is disconnected, and the purpose of protecting the universal meter is achieved by disconnecting the circuit.

Description

Technical Field

[0001] The invention relates to the technical field of multimeter protection equipment, and in particular to a protection switch device for an electric power measuring multimeter. Background Art

[0002] A multimeter is a magnetoelectric instrument with a rectifier that can measure various electrical parameters such as AC and DC current, voltage, and resistance.

[0003] The working environment of a multimeter is mostly to measure whether there is an abnormality in the circuit. When measuring the circuit, if a short circuit occurs in the circuit, the current will increase instantly, and the abnormal current can easily exceed the range of the multimeter, which can easily cause the current inside the multimeter to be too large, causing damage to the multimeter; In the prior art, the multimeter is mostly protected by a fuse, but the fuse will be blown after use, making the multimeter unusable. When continuing to inspect the circuit, it is necessary to replace the fuse or replace another multimeter to measure the circuit again. However, the fuse is mostly built inside the multimeter, which greatly reduces the efficiency of circuit inspection.

[0004] Therefore, those skilled in the art provide a protection switch device for an electric power measuring multimeter to solve the problems raised in the above background technology. Summary of the invention

[0005] The object of the present invention is to provide a protection switch device for an electric power measuring multimeter to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: The above technical objectives of the present invention are achieved through the following technical solutions: A protection switch device for a power measurement multimeter comprises a multimeter outer frame, a multimeter circuit board is arranged inside the multimeter outer frame, a protection structure is arranged on the back side of the multimeter circuit board, an outer frame back plate is arranged on the back side of the multimeter outer frame, a sliding groove is opened at a position of the outer frame back plate corresponding to the protection structure, and a structural switch is arranged inside the sliding groove; The protection structure includes a support plate, support rods fixedly connected to the multimeter circuit board are arranged at the four corners of the support plate, a sliding plate is arranged on the side wall of the support plate, a fixed platform is arranged on the end wall of the sliding plate, an extension platform is slidably arranged inside the sliding plate, a locking structure is arranged inside the extension platform, a connecting platform is arranged at the upper end of the support plate opposite to the sliding plate, a conductive coil is arranged inside the connecting platform, and a conductive plate connected to the conductive coil is arranged at the end of the connecting platform, and a trigger structure is arranged inside the connecting platform.

[0007] Furthermore, the locking structure includes a rotation groove, which is opened at the end of the extension platform. A rotation shaft is arranged at the top of the extension platform, and a locking rod is rotatably arranged on the outer peripheral wall of the rotation shaft.

[0008] Furthermore, the trigger structure includes a sliding groove, which is opened inside the connecting platform. A sliding block is slidably arranged inside the sliding groove. A pin penetrating the connecting platform is arranged at one end of the sliding block, and reset springs are arranged at both ends of the sliding block.

[0009] Furthermore, the position of the ejector pin corresponds to the position of the locking rod, and the diameter of the ejector pin is smaller than the width of the rotation slot.

[0010] Furthermore, the structural switch includes a switch slide, which is slidably installed inside the sliding groove. An extension rod is provided at the bottom end of the switch slide, and a separation cylinder is provided at the bottom end of the extension rod. The separation cylinder is fixedly connected to the extension platform, and an extension spring connected to the fixed platform is provided inside the separation cylinder.

[0011] Furthermore, an extension guide rod is arranged inside the extension spring, and the extension guide rod includes an outer sleeve and an inner sliding tube, the outer sleeve is fixedly connected to the separation cylinder, and the inner sliding tube is fixedly connected to the fixing platform.

[0012] Furthermore, a locking groove is provided at a position near the end of the top end of the sliding plate, and when the extension platform contacts the guide plate, the position of the locking rod corresponds to the position of the locking groove.

[0013] Furthermore, both ends of the switch slide are provided with extension plates, and the extension plates and the outer frame back plate are in contact with each other.

[0014] In summary, the present invention includes at least one of the following beneficial technical effects: 1. A protection switch device for a power measurement multimeter. When the current in the circuit measured by the multimeter is greater than the range of the multimeter, the larger current passes through the conductive coil, and the magnetic field generated by the conductive coil increases, attracting the sliding block to push the ejector pin to move, and the locking rod is pushed out of the lock slot through the ejector pin, thereby releasing the lock on the extension table. At this time, the extension table is separated from the conductive plate under the influence of the extension spring, so that the circuit is disconnected, so as to achieve the purpose of protecting the multimeter by disconnecting the circuit; 2. This kind of protection switch device for electric power measuring multimeter, after the circuit is disconnected, push the switch slide, so that the extension rod at the lower end of the switch slide and the separation cylinder push the extension platform to move until the extension platform contacts the conductive sheet, and at the same time the locking rod falls down under the influence of the spring, and cooperates with the locking slot to lock the extension platform, so that the circuit is closed again, and the multimeter can be quickly reset to facilitate the use of the multimeter again, which can effectively improve the efficiency of repairing abnormal circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a front structural schematic diagram of a protection switch device for an electric power measuring multimeter of the present invention; Figure 2 It is a schematic diagram of the back structure of a protection switch device for an electric power measuring multimeter of the present invention; Figure 3 It is a schematic diagram of the internal structure of a multimeter outer frame of a protection switch device for an electric power measuring multimeter of the present invention; Figure 4 It is a structural schematic diagram of a protection structure of a protection switch device for an electric power measuring multimeter of the present invention; Figure 5 It is a schematic diagram of the structure switch of a protection switch device for an electric power measuring multimeter of the present invention; Figure 6 It is a structural schematic diagram of a trigger structure of a protection switch device for an electric power measuring multimeter of the present invention; Figure 7 The present invention is a planar structural schematic diagram of a trigger structure and a locking structure of a protection switch device for an electric power measuring multimeter.

[0017] In the figure, 1. multimeter frame; 2. multimeter circuit board; 3. protection structure; 31. support plate; 32. support rod; 33. sliding plate; 34. fixed platform; 35. extension platform; 36. connecting platform; 37. conductive coil; 38. conductive plate; 39. locking slot; 4. outer frame back plate; 5. sliding slot; 6. structural switch; 61. switch slide plate; 62. extension rod; 63. separation cylinder; 64. extension spring; 65. outer sleeve; 66. inner slide tube; 67. extension plate; 7. locking structure; 71. rotating slot; 72. rotating shaft; 73. locking rod; 8. trigger structure; 81. sliding slot; 82. sliding block; 83. ejector pin; 84. reset spring. DETAILED DESCRIPTION

[0018] Below, the invention is further described in conjunction with the accompanying drawings and specific embodiments: Example: Refer to Figure 1 - Figure 7The present invention discloses a protection switch device for a power measurement multimeter, comprising a multimeter outer frame 1, a multimeter circuit board 2 is arranged inside the multimeter outer frame 1, a protection structure 3 is arranged on the back side of the multimeter circuit board 2, an outer frame back plate 4 is arranged on the back side of the multimeter outer frame 1, a sliding groove 5 is opened at a position of the outer frame back plate 4 corresponding to the protection structure 3, and a structural switch 6 is arranged inside the sliding groove 5; The protection structure 3 includes a support plate 31, and support rods 32 fixedly connected to the multimeter circuit board 2 are arranged at the four corners of the support plate 31, a sliding plate 33 is arranged on the side wall of the support plate 31, and a fixed platform 34 is arranged on the end wall of the sliding plate 33. An extension platform 35 is slidably arranged inside the sliding plate 33, and a locking structure 7 is arranged inside the extension platform 35. A connecting platform 36 is arranged at the upper end of the support plate 31 opposite to the sliding plate 33, a conductive coil 37 is arranged inside the connecting platform 36, and a conductive plate 38 connected to the conductive coil 37 is arranged at the end of the connecting platform 36, and a trigger structure 8 is arranged inside the connecting platform 36.

[0019] In this embodiment, Figure 1 The front structural diagram of the multimeter shown, wherein the front of the multimeter frame 1 includes a display screen, an adjustment knob, a multimeter switch and four wire connectors; When the multimeter is in normal use, the extension platform 35 and the conductive plate 38 are in contact with each other, and the conductive plate 38 and the extension platform 35 are connected to the multimeter circuit board 2 through the wire to form a closed loop, and the locking structure 7 is in a locked state at this time. Figure 5 As shown; When the current in the circuit measured by the multimeter is greater than the range of the multimeter, the larger current passes through the conductive coil 37 to generate a magnetic field and push the trigger structure 8 to move. After the trigger structure 8 moves, it pushes the locking structure 7 to unlock the extension platform 35. Figure 7 As shown, at this time, the extension platform 35 is affected by the structural switch 6 and moves away from the conductive plate 38, so that the loop is disconnected, thereby achieving the purpose of disconnecting the circuit protection device.

[0020] In a further preferred embodiment of the present invention, Figure 5 and Figure 7 As shown, the locking structure 7 includes a rotation groove 71 , which is opened at the end of the extension platform 35 , a rotation shaft 72 is arranged at the top of the extension platform 35 , and a locking rod 73 is rotatably arranged on the outer peripheral wall of the rotation shaft 72 .

[0021] In this embodiment, when the extension platform 35 slides to contact the conductive plate 38, Figure 7As shown, at this time, the locking rod 73 will fall into the locking groove 39 under the action of gravity. At this time, the locking rod 73 and the locking groove 39 are clamped with each other, thereby achieving the purpose of fixing the extension platform 35. During the sliding process, the extension platform 35 will stretch the extension spring 64, causing the extension spring 64 to extend and accumulate potential energy. After the locking structure 7 is unlocked, the extension platform 35 will be pulled back to achieve the purpose of disconnecting the circuit.

[0022] In a further preferred embodiment of the present invention, Figure 6 As shown, the trigger structure 8 includes a sliding groove 81, which is opened inside the connecting platform 36. A sliding block 82 is slidably arranged inside the sliding groove 81. A pin 83 that passes through the connecting platform 36 is arranged at one end of the sliding block 82, and a return spring 84 is arranged at both ends of the sliding block 82.

[0023] In this embodiment, the sliding groove 81 is used to install the sliding block 82. The sliding block 82 is made of metal and will be attracted by the magnetic field. The sliding block 82 is coaxially arranged with the conductive coil 37. When the current flowing in the conductive coil 37 is too large, the magnetic field generated by the conductive coil 37 increases, thereby attracting the sliding block 82 to slide inside the conductive coil 37. At this time, the sliding block 82 will push the ejector pin 83 to move and contact the locking rod 73. Figure 7 As shown, at this time, the locking rod 73 will be pushed out of the locking groove 39, thereby releasing the lock on the extension platform 35. At this time, the extension platform 35 is affected by the extension spring 64 to reset, thereby achieving the purpose of disconnecting the circuit.

[0024] In a further preferred embodiment of the present invention, Figure 7 As shown, the position of the ejector pin 83 corresponds to the position of the locking rod 73 , and the diameter of the ejector pin 83 is smaller than the width of the rotation slot 71 .

[0025] In this embodiment, since the width of the rotation groove 71 is greater than the diameter of the ejector pin 83 , the ejector pin 83 can be inserted into the rotation groove 71 and push the locking rod 73 to move upward, thereby releasing the locking device.

[0026] In a further preferred embodiment of the present invention, Figure 3 and Figure 5 As shown, the structural switch 6 includes a switch slide 61, which is slidably installed inside the sliding groove 5. An extension rod 62 is provided at the bottom end of the switch slide 61, and a separation cylinder 63 is provided at the bottom end of the extension rod 62. The separation cylinder 63 is fixedly connected to the extension platform 35, and an extension spring 64 connected to the fixed platform 34 is provided inside the separation cylinder 63.

[0027] In this embodiment, the switch slide 61 corresponds to the groove wall of the sliding groove 5 through the sliding grooves on both sides, so that the switch slide 61 is slidably connected with the sliding groove 5. After the circuit is disconnected, the switch slide 61 can be manually pushed to make the extension rod at the lower end of the switch slide 61 and the separation cylinder 63 push the extension platform 35 to move until the extension platform 35 contacts the conductive sheet. At the same time, the locking rod 73 falls down under the influence of the spring 700 to cooperate with the locking groove 39 to lock the extension platform 35, and the extension spring 64 will be stretched during the movement of the extension platform 35 to accumulate potential energy so as to facilitate the reset of the extension platform 35 to disconnect the circuit.

[0028] In a further preferred embodiment of the present invention, Figure 5 As shown, an extension guide rod is arranged inside the extension spring 64 , and the extension guide rod includes an outer sleeve 65 and an inner slide tube 66 . The outer sleeve 65 is fixedly connected to the separation cylinder 63 , and the inner slide tube 66 is fixedly connected to the fixed platform 34 .

[0029] In this embodiment, the outer sleeve 65 and the inner sliding tube 66 are provided to guide the stretching direction of the extension spring 64, and provide damping for the return of the extension spring 64, thereby reducing and preventing the extension spring 64 from shaking, thereby improving the stability of the equipment.

[0030] In a further preferred embodiment of the present invention, Figure 5 and Figure 7 As shown, a locking groove 39 is provided at the top of the sliding plate 33 near the end. When the extension platform 35 contacts the guide plate, the position of the locking rod 73 corresponds to the position of the locking groove 39 .

[0031] In this embodiment, the locking groove 39 is configured to cooperate with the locking rod 73 to lock the extension platform 35 .

[0032] In a further preferred embodiment of the present invention, Figure 3 As shown, both ends of the switch slide plate 61 are provided with extension plates 67 , and the extension plates 67 are in contact with the outer frame back plate 4 .

[0033] In this embodiment, the extension plate 67 is provided to shield the notch of the sliding slot 5, so that the switch slide plate 61 can slide and prevent external dust from entering the interior of the multimeter through the notch.

[0034] The implementation principle of the above embodiment is: when the current in the circuit measured by the multimeter is greater than the range of the multimeter, the larger current passes through the conductive coil 37, and the magnetic field generated by the conductive coil 37 increases, thereby attracting the sliding block 82 to slide inside the conductive coil 37. At this time, the sliding block 82 will push the ejector pin 83 to move and push the locking rod 73 out of the locking groove 39, thereby releasing the lock on the extension platform 35. At this time, the extension platform 35 is separated from the conductive plate 38 by the extension spring 64, so that the circuit is disconnected, so as to achieve the purpose of protecting the multimeter by disconnecting the circuit; After the circuit is disconnected, by pushing the switch slide 61, the extension rod at the lower end of the switch slide 61 and the separation cylinder 63 push the extension platform 35 to move until the extension platform 35 contacts the conductive sheet, and at the same time the locking rod 73 falls down to cooperate with the locking slot 39 to lock the extension platform 35, so that the circuit is closed again, and the multimeter can be quickly reset so that the multimeter can be used again, which can effectively improve the efficiency of abnormal circuit maintenance.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protection switch device for an electric power measuring multimeter, characterized in that: The multimeter comprises an outer frame (1), a multimeter circuit board (2) is arranged inside the outer frame (1), a protective structure (3) is arranged on the back side of the multimeter circuit board (2), an outer frame back plate (4) is arranged on the back side of the multimeter outer frame (1), a sliding groove (5) is provided at a position of the outer frame back plate (4) corresponding to the protective structure (3), and a structural switch (6) is arranged inside the sliding groove (5); The protection structure (3) comprises a support plate (31), support rods (32) fixedly connected to the multimeter circuit board (2) are arranged at four corners of the support plate (31), a sliding plate (33) is arranged on the side wall of the support plate (31), a fixed platform (34) is arranged on the end wall of the sliding plate (33), an extension platform (35) is slidably arranged inside the sliding plate (33), a locking structure (7) is arranged inside the extension platform (35), a connecting platform (36) is arranged at a position of the upper end of the support plate (31) opposite to the sliding plate (33), a conductive coil (37) is arranged inside the connecting platform (36), a conductive plate (38) connected to the conductive coil (37) is arranged at the end of the connecting platform (36), and a trigger structure (8) is arranged inside the connecting platform (36).

2. A protection switch device for an electric power measuring multimeter according to claim 1, characterized in that: The locking structure (7) comprises a rotation groove (71), the rotation groove (71) being opened at the end of the extension platform (35), a rotation shaft (72) being arranged at the top end of the extension platform (35), and a locking rod (73) being rotatably arranged on the outer peripheral wall of the rotation shaft (72).

3. A protection switch device for an electric power measuring multimeter according to claim 2, characterized in that: The trigger structure (8) comprises a sliding groove (81), the sliding groove (81) being arranged inside the connecting platform (36), a sliding block (82) being slidably arranged inside the sliding groove (81), a pin (83) penetrating the connecting platform (36) being arranged at one end of the sliding block (82), and return springs (84) being arranged at both ends of the sliding block (82).

4. A protection switch device for an electric power measuring multimeter according to claim 3, characterized in that: The position of the ejector pin (83) corresponds to the position of the locking rod (73), and the diameter of the ejector pin (83) is smaller than the width of the rotating groove (71).

5. A protection switch device for an electric power measuring multimeter according to claim 4, characterized in that: The structural switch (6) comprises a switch slide (61), the switch slide (61) being slidably mounted inside the sliding groove (5), an extension rod (62) being arranged at the bottom end of the switch slide (61), a separation cylinder (63) being arranged at the bottom end of the extension rod (62), the separation cylinder (63) being fixedly connected to the extension platform (35), and an extension spring (64) being arranged inside the separation cylinder (63) and being connected to the fixing platform (34).

6. A protection switch device for an electric power measuring multimeter according to claim 5, characterized in that: An extension guide rod is arranged inside the extension spring (64), and the extension guide rod comprises an outer sleeve (65) and an inner slide tube (66). The outer sleeve (65) is fixedly connected to the separation cylinder (63), and the inner slide tube (66) is fixedly connected to the fixed platform (34).

7. A protection switch device for an electric power measuring multimeter according to claim 6, characterized in that: A locking groove (39) is provided at a position near the end of the top end of the sliding plate (33); when the extension platform (35) contacts the guide plate, the position of the locking rod (73) corresponds to the position of the locking groove (39).

8. A protection switch device for an electric power measuring multimeter according to claim 7, characterized in that: Both ends of the switch slide plate (61) are provided with extension plates (67), and the extension plates (67) and the outer frame back plate (4) are in contact with each other.

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