A changeover switch for easy key replacement

Abstract

The utility model discloses a switch for convenient key replacement, comprising a handle, a panel frame, a positioning box, and a contact box which are arranged in sequence from top to bottom, the handle passes through the panel frame and is located in the positioning box, a core shaft is arranged in the positioning box and the contact box, a key lock is arranged inside the handle, the core shaft is connected to the key lock by transmission, a quick-change mechanism is arranged between the positioning box and the panel frame, the quick-change mechanism comprises a card plate and a card block, a limit plate is fixedly arranged at the bottom of the key lock, the limit plate is plugged into the card plate, the card block is sleeved on the outer side wall of the key lock, the bottom of the card block abuts against the top of the limit plate, and the card block is connected to the card plate by carding. The utility model has the advantages of convenient key lock replacement, no need to disassemble the wires on the contact box, and no need to separate the contact box from the positioning box to complete the key lock replacement.

Description

Technical Field

[0001] The utility model relates to the field of transfer switches, in particular to a transfer switch which is convenient for replacing a key. Background Art

[0002] Universal transfer switch is a multi-speed main control appliance that controls multiple circuits. Universal transfer switch is mainly used for the conversion of multiple control circuits, remote control and conversion of distribution device circuits, phase change measurement and control of voltmeters, etc. Universal transfer switch can also be directly used to control the start, reversing and speed regulation of small-capacity motors. It is usually used as a control switch, test equipment switch, motor control switch and main switch in electrical equipment.

[0003] At present, a key-type transfer switch is composed of a handle with a key lock, a panel frame, a positioning box, and a contact box. Due to the needs of the application site of the transfer switch, the customer requires the key switch to be coded and changed, or the original keyless switch needs to be replaced with a key-type transfer switch. The common solution in the industry is to remove the entire transfer switch from the electrical cabinet and directly replace it with a transfer switch that meets the requirements. When replacing and installing, the contact box needs to be rewired, and it is easy to connect the wrong lines during wiring, which greatly increases the workload and risk of replacement. Therefore, the present application provides a transfer switch that does not require the contact box and the positioning box to be disassembled, and does not require the entire transfer switch to be separated from the electrical cabinet wiring, and can be key-changed based on the original transfer switch without removing the wiring. Utility Model Content

[0004] The utility model aims to provide a conversion switch which is convenient for replacing keys, and has the advantages of conveniently replacing the key lock, and completing the key lock replacement without removing the wires on the contact box and separating the contact box from the positioning box.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A switch for easy key replacement comprises a handle, a panel frame, a positioning box, and a contact box which are arranged in sequence from top to bottom. A core shaft is arranged in the positioning box and the contact box. A key lock is arranged inside the handle. The core shaft is in transmission connection with the key lock. A quick-change mechanism is arranged between the positioning box and the panel frame. The quick-change mechanism comprises a card plate and a card block. A limit plate is fixedly arranged at the bottom of the key lock. The limit plate is inserted in the card plate. The card block is sleeved on the outer side wall of the key lock. The bottom of the card block abuts against the top of the limit plate. The card block is card-engaged with the card plate.

[0007] The cardboard is a square block, the top of the cardboard is provided with a first circular groove, the bottom of the first circular groove is provided with a second circular groove, the center of the bottom wall of the second circular groove is provided with a first circular through hole, and the upper end of the mandrel is inserted into the first circular through hole;

[0008] The inner side wall circumferential array of the second placement circular groove has two first limiting blocks in a square shape, the limiting plate is in a circular ring shape, the limiting plate is provided with first limiting grooves corresponding to the two first limiting blocks, and the limiting plate is inserted into the second placement circular groove of the card plate through the two first limiting grooves and the first limiting blocks corresponding to them;

[0009] Four baffles are arranged in a circular array on the upper end of the side wall of the first placement circular groove, each of the baffles has a fan-shaped cross section, and each of the baffles is provided with a stop plate on one side close to the next baffle in the clockwise direction, and the bottom of each stop plate is fixedly connected to the bottom wall of the first placement circular groove;

[0010] The card block is in a circular ring shape, and the thickness of the card block is consistent with the thickness of the first placement circular groove. Four plug-in plates are arranged in a circular array on the outer wall of the card block, and the cross-sections of the four plug-in plates are all fan-shaped. Each plug-in plate is provided with a plug-in block on one side close to the next plug-in plate in the clockwise direction. The plug-in blocks are fan-shaped, and a card slot is provided at one end of the top of each plug-in block away from its corresponding plug-in plate, and two semicircular protrusions are fixedly provided at the bottom of each baffle at the position of the corresponding card slot.

[0011] The preferred solutions are as follows:

[0012] Preferably, the arc length between the sides of each two baffles close to each other is twice the arc length of the side wall corresponding to the outer diameter of the baffle, and the thickness of the baffle is half the depth of the first placement circular groove.

[0013] Preferably: the thickness of the insert is consistent with the distance from the bottom of the baffle to the bottom wall of the first placement circular groove, the arc length of the side wall corresponding to the outer diameter of the insert is consistent with the arc length of the side wall corresponding to the outer diameter of the baffle, and the arc length of the side wall corresponding to the outer diameter of the insert is four fifths of the arc length of the side wall corresponding to the outer diameter of the baffle.

[0014] Preferably, four fan-shaped first make way grooves are formed in a circumferential array on the bottom wall of the first circular placement groove, and the four first make way grooves are respectively located directly below the four baffles.

[0015] Preferably: the inner side wall circumferential array of the second circular groove has two second limit blocks, and the angle formed by the two second limit blocks and the adjacent first limit blocks is 90°;

[0016] The cross section of each second limit block is fan-shaped, and each second limit block is provided with an arc-shaped protrusion on one side close to the center of the second placement circular groove. The limit plate is provided with second limit grooves corresponding to the two second limit blocks and the arc-shaped protrusions, and the limit plate is inserted into the second placement circular groove of the card plate through the two second limit grooves and the corresponding second limit blocks and the arc-shaped protrusions;

[0017] A second circular through-hole is provided on the bottom wall of the first placement circular groove, the top of the second limit block, and the top of the arc-shaped protrusion. Two third circular through-holes corresponding to the second circular through-holes are provided on the top of the positioning box. A first bolt is provided in each of the second circular through-holes, and each of the first bolts passes through its corresponding third circular through-hole and is fixedly connected to the contact box.

[0018] Preferably: each of the plug blocks is fixedly connected to the card block, and the card block has four fan-shaped second easing grooves in a circumferential array at the bottom, the outer diameter of each of the second easing grooves is consistent with the outer diameter of the card block, the four second easing grooves correspond to the positions of four plug blocks respectively, the arc length of the side wall corresponding to the outer diameter of each of the second easing grooves is two-thirds of the arc length of the side wall corresponding to the inner diameter of the plug block, and each of the second easing grooves is located on the side of its corresponding plug block away from the plug board.

[0019] Preferably, four first waist-shaped grooves are arranged in a circular array on the top of the block.

[0020] Preferably, two waist-shaped blocks are fixedly provided at the bottom of the card plate, the positions of the two waist-shaped blocks are staggered with the positions of the two first circular perforations, and the top of the positioning box is provided with two second waist-shaped grooves corresponding to the waist-shaped blocks.

[0021] Preferably: a fourth circular through hole is opened at the four corners of the top of the card plate, four hexagonal grooves are opened at the four corners of the bottom of the card plate, two triangular blocks are arranged in each of the hexagonal grooves, a second nut is arranged between the triangular block and the inner top wall of the hexagonal groove, four waist-shaped through holes are opened at the four corners of the top of the panel frame, a second bolt is inserted in each of the waist-shaped through holes, and each of the second bolts passes through the fourth circular through hole and is threadedly connected to its corresponding second nut.

[0022] To summarize, the utility model places the limit plate of the key lock in the card plate, the limit plate completes the limit in the card plate, and at the same time the card block is rotated and connected in the card plate, the card block and the limit plate are abutted, and the card block presses the limit plate inside the card plate, thereby completing the fixation of the key lock. When replacing the key lock, you only need to unscrew the card plate, then take out the key lock, put in a new key lock, and then clamp the card block on, thereby completing the replacement of the key lock of the conversion switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0024] Figure 2 is a partial cross-sectional view of Example 1 after removing the handle and the panel frame;

[0025] Figure 3is a schematic structural diagram of the limit plate and the clamping plate after the panel frame and the clamping block are removed from Example 1;

[0026] Figure 4 It is an exploded view of the structural schematic diagram of the key lock and the positioning box after the panel frame and the quick-change mechanism are removed from Example 1;

[0027] Figure 5 is a partial schematic diagram of the panel frame of Example 1;

[0028] Figure 6 is a structural schematic diagram of a card board and a card block in Example 1;

[0029] Figure 7 is a partial cross-sectional view of the card plate and a structural schematic diagram of the card block of Example 1;

[0030] Figure 8 It is a schematic diagram of the overall structure of the card board of Example 1;

[0031] Fig. 9 is a bottom side view of the card board of Example 1;

[0032] Fig.10 is a schematic diagram of the overall structural shape of the card block of Example 1;

[0033] Fig.11 is a bottom side view of the card block of Example 1;

[0034] Fig.12 is a partial cross-sectional view of a second embodiment in which the key lock of the first embodiment is replaced with a handle structure;

[0035] Fig.13 It is an exploded view of the overall structural shape of Example 3;

[0036] Fig.14 This is an exploded view of Example 4 in which the key lock of Example 3 is replaced with a handle structure.

[0037] In the figure, 1, handle; 2, panel frame; 3, positioning box; 4, contact box; 5, spindle; 6, key lock; 7, quick change mechanism; 8, card plate; 9, card block;

[0038] 211, waist-shaped perforation; 212, second bolt;

[0039] 311, third circular perforation; 312, second waist-shaped groove;

[0040] 611, limiting plate; 612, first limiting groove; 613, second limiting groove;

[0041] 811, first placement circular groove; 812, second placement circular groove; 813, first circular perforation; 814, first limit block; 815, baffle plate; 816, stop plate; 817, semicircular protrusion; 818, first clearance groove; 819, second limit block; 820, arc-shaped protrusion; 821, second circular perforation; 822, first bolt; 823, waist-shaped block; 824, fourth circular perforation; 825, hexagonal groove; 826, triangular block; 827, second nut;

[0042] 911, plug board; 912, plug block; 913, card slot; 914, second yielding slot; 915, first waist-shaped slot;

[0043] 1001. Rotating block; 1002. Connecting rod; 1003. Rotating plate. DETAILED DESCRIPTION

[0044] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0045] The same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings.

[0046] Embodiment 1: A switch for easily changing a key, such as Figure 1-Figure 11 As shown, it includes a handle 1, a panel frame 2, a positioning box 3, and a contact box 4 which are arranged in sequence from top to bottom. A core shaft 5 is provided in the positioning box 3 and the contact box 4. A key lock 6 is provided inside the handle 1. The upper end of the core shaft 5 is square. The upper end of the core shaft 5 is inserted into the key lock 6. The core shaft 5 is transmission-connected to the key lock 6.

[0047] A quick-change mechanism 7 is provided between the positioning box 3 and the panel frame 2, and the quick-change mechanism 7 includes a card plate 8 and a card block 9. A limit plate 611 is fixedly provided at the bottom of the key lock 6, and the limit plate 611 is inserted into the card plate 8. The card block 9 is sleeved on the outer wall of the key lock 6, and the bottom of the card block 9 is abutted against the top of the limit plate 611, and the card block 9 is clamped with the card plate 8. By placing the limit plate 611 of the key lock 6 in the card plate 8, the limit plate 611 is limited in the card plate 8, and at the same time, the card block 9 is rotated and clamped in the card plate 8, the card block 9 is abutted against the limit plate 611, and the card block 9 presses the limit plate 611 inside the card plate 8, thereby completing the fixation of the key lock 6.

[0048] The card plate 8 is a square block, and the positioning box 3 is a cylinder. The top area of ​​the card plate 8 in this embodiment is 1.3 times the top area of ​​the positioning box 3, and the area of ​​the top of the panel frame 2 is consistent with the area of ​​the top of the card plate 8. A first circular placement groove 811 is provided on the top of the card plate 8, and a second circular placement groove 812 is provided on the bottom of the first circular placement groove 811. A first circular through hole 813 is provided at the center of the bottom wall of the second circular placement groove 812. The upper end of the core shaft 5 is inserted into the first circular through hole 813, the limiting plate 611 is inserted into the second circular placement groove 812, and the card block 9 is clamped in the first circular placement groove 811.

[0049] The inner side wall of the second placement circular groove 812 has two square first limit blocks 814 in a circular array, and the inner side wall of the second placement circular groove 812 also has two second limit blocks 819 in a circular array, and the angle formed by the two second limit blocks 819 and the adjacent first limit blocks 814 is 90°;

[0050] The limiting plate 611 is in a circular shape, and is provided with a first limiting groove 612 corresponding to the two first limiting blocks 814. The limiting plate 611 is inserted into the second placement circular groove 812 of the card plate 8 through the two first limiting grooves 612 and the first limiting blocks 814 corresponding to the two first limiting grooves 612. The limiting plate 611 can be limited by the two first limiting blocks 814 and the two first limiting grooves 612.

[0051] The cross section of each second limiting block 819 is fan-shaped, and each second limiting block 819 is provided with an arc-shaped protrusion 820 on one side close to the center of the second placement circular groove 812. The limiting plate 611 is provided with a second limiting groove 613 corresponding to the two second limiting blocks 819 and the arc-shaped protrusion 820. The limiting plate 611 is inserted into the second placement circular groove 812 of the card plate 8 through the two second limiting grooves 613 and the corresponding second limiting blocks 819 and the arc-shaped protrusion 820.

[0052] A second circular through hole 821 is provided on the bottom wall of the first placement circular groove 811, the top of the second limiting block 819, and the top of the arc-shaped protrusion 820. Since the bottom wall of the first placement circular groove 811 is provided with the second placement circular groove 812, and the card plate 8 needs to be fixed with the positioning box 3, the bottom wall of the first placement circular groove 811 cannot be inserted with the first bolt 822. At this time, the second limiting block 819 and the arc-shaped protrusion 820 increase the area for providing the second circular through hole 821, and the positioning box The top of the contact box 3 is provided with two third circular through holes 311 corresponding to the second circular through holes 821, each second circular through hole 821 is provided with a first bolt 822, each first bolt 822 passes through its corresponding third circular through hole 311 and is fixedly connected to the contact box 4, and the vertical section of the second circular through hole 821 is "T" shaped, so that the bolt head of the first bolt 822 can be placed on the inner upper end of the corresponding second circular through hole 821, so that the bottom wall of the first placement circular groove 811 remains flat.

[0053] Four baffles 815 are arranged in a circular array on the upper end of the side wall of the first placement circular groove 811. The cross section of each baffle 815 is fan-shaped. Each baffle 815 is provided with a stop plate 816 on the side close to the next baffle 815 in the clockwise direction. The bottom of each stop plate 816 is fixedly connected to the bottom wall of the first placement circular groove 811. The arc length between the sides of each two baffles 815 close to each other is twice the arc length of the side wall corresponding to the outer diameter of the baffle 815. The thickness of the baffle 815 is half the depth of the first placement circular groove 811.

[0054] The card block 9 is in a circular ring shape, and the thickness of the card block 9 is consistent with the thickness of the first placement circular groove 811. Four plug plates 911 are arranged in a circular array on the outer wall of the card block 9. The cross sections of the four plug plates 911 are all fan-shaped. Each plug plate 911 is provided with a plug block 912 on one side close to the next plug plate 911 in the clockwise direction. The plug block 912 is fan-shaped. The thickness of the plug block 912 is consistent with the distance from the bottom of the baffle 815 to the bottom wall of the first placement circular groove 811. The arc length of the side wall corresponding to the outer diameter of the plug plate 911 is consistent with the arc length of the side wall corresponding to the outer diameter of the baffle 815. The arc length of the side wall corresponding to the outer diameter of the plug block 912 is four fifths of the arc length of the side wall corresponding to the outer diameter of the baffle 815.

[0055] The card block 9 is sleeved on the outer wall of the key lock 6, and the card block 9 slides into the first placement circular groove 811. At this time, each plug plate 911 of the card block 9 and the corresponding plug block 912 are respectively located between the four baffles 815. The card block 9 is rotated, and the plug block 912 of each card block 9 is respectively inserted into the bottom of its corresponding baffle 815, and the plug plate 911 of each card block 9 is respectively against its corresponding baffle 815.

[0056] The bottom wall of the first placement circular groove 811 is provided with four fan-shaped first clearance grooves 818 in a circumferential array, and the four first clearance grooves 818 are respectively located directly below the four baffles 815. A slot 913 is provided at the top of each plug block 912 away from its corresponding plug board 911. Two semicircular protrusions 817 are fixedly provided at the bottom of each baffle 815 and the corresponding slot 913. When the plug block 912 is inserted into the bottom of its corresponding baffle 815, the baffle 815 is required to push the plug block 912 into place. The key lock 6 is limited and fixed in position, but the friction alone can easily cause the block 9 to loosen after a long period of trial. At this time, the block 9 can be limited by the setting of the semicircular protrusion 817 and the card slot 913. At the same time, the setting of the first yielding groove 818 makes the insertion block 912 deform when encountering the semicircular protrusion 817 during insertion, and the deformation direction is toward the first yielding groove 818. When the semicircular protrusion 817 is inserted into the card slot 913, the insertion block 912 rebounds, thereby completing the fixation of the block 9.

[0057] In order to ensure that the plug block 912 of the card block 9 can rebound in time when inserted into the bottom of the baffle 815, and maintain the rebound ability after long-term use, each plug block 912 is fixedly connected to the card block 9, and the card block 9 has four fan-shaped second give way grooves 914 in a circular array at the bottom. The outer diameter of each second give way groove 914 is consistent with the outer diameter of the card block 9. The four second give way grooves 914 correspond to the positions of the four plug blocks 912 respectively. The arc length of the side wall corresponding to the outer diameter of each second give way groove 914 is two-thirds of the arc length of the side wall corresponding to the inner diameter of the plug block 912. Each second give way groove 914 is located on the side of its corresponding plug block 912 away from the plug plate 911, and one-third of the side wall of each plug block 912 is fixedly connected to the card block 9, which can effectively ensure the quality of the plug block 912.

[0058] In order to facilitate the rotation of the block 9, four first waist-shaped grooves 915 are provided in a circular array on the top of the block 9. A "Y"-shaped flywheel wrench can be inserted into two of the first waist-shaped grooves 915, and the "Y"-shaped flywheel wrench can be rotated to drive the block 9 to rotate.

[0059] Two waist-shaped blocks 823 are fixedly provided at the bottom of the card plate 8, and the positions of the two waist-shaped blocks 823 are staggered with the positions of the two first circular through-holes 813. Two second waist-shaped grooves 312 corresponding to the waist-shaped blocks 823 are provided on the top of the positioning box 3. When the card plate 8 is placed on the top of the positioning box 3, it is initially positioned by the two waist-shaped blocks 823 and the two second waist-shaped grooves 312, and then fixed by the first bolt 822 and the first nut.

[0060] A fourth circular through hole 824 is provided at the four corners of the top of the card plate 8, and four hexagonal grooves 825 are provided at the four corners of the bottom of the card plate 8. Two triangular blocks 826 are provided in each hexagonal groove 825. A second nut 827 is provided between the triangular block 826 and the inner top wall of the hexagonal groove 825. Four waist-shaped through holes 211 are provided at the four corners of the top of the panel frame 2. A second bolt 212 is inserted in each waist-shaped through hole 211. Each second bolt 212 passes through the fourth circular through hole 824 and is threadedly connected with its corresponding second nut 827. The mounting plate of the electrical equipment is located between the positioning box 3 and the card plate 8 of the quick-change mechanism 7. During installation, the conversion switch is fixed to the mounting plate of the electrical equipment by the second bolt 212 and the second nut 827.

[0061] Specific implementation process:

[0062] Step 1: Fixedly connect the contact box 4 and the positioning box 3;

[0063] Step 2: The card plate 8 is limited by the two waist-shaped blocks 823 at the bottom of the card plate 8 and the two second waist-shaped grooves 312 at the top of the positioning box 3;

[0064] Step 3: First bolts 822 are placed in the two second circular through holes 821 on the bottom wall of the first placement circular groove 811 of the card plate 8. The first bolts 822 pass through the card plate 8, the positioning box 3 and the contact box 4 and are fixedly connected by threads. The tops of the two first bolts 822 are flush with the bottom wall of the first placement circular groove 811.

[0065] Step 4: Sleeve the card block 9 on the outer wall of the key lock 6;

[0066] Step 5: The limiting plate 611 of the key lock 6 is inserted into the second placement circular groove 812 of the card plate 8 through the two first limiting grooves 612 and the two first limiting blocks 814 of the card plate 8, the two second limiting grooves 613 and the corresponding second limiting blocks 819 of the card plate 8, and the arc-shaped protrusion 820;

[0067] Step 6: Push the card block 9 downwards, so that the bottom of the card block 9 abuts against the bottom wall of the first placement circular groove 811, rotate the card block 9 clockwise, and the plug block 912 of each card block 9 is respectively inserted into the bottom of its corresponding baffle 815, and the plug plate 911 of each card block 9 abuts against its corresponding baffle 815, and the semicircular protrusion 817 at the bottom of each baffle 815 is snapped into the slot 913 of its corresponding plug block 912;

[0068] Step 7: The panel frame 2 is fixedly connected to the clamping plate 8 by four second bolts 212 and second nuts 827;

[0069] Step 8: A handle 1 is fixedly mounted on the key lock 6;

[0070] Step nine: When the key lock 6 needs to be replaced after installation, just remove the handle 1, remove the panel frame 2 by loosening the four second bolts 212 and the second nuts 827, then rotate the block 9 counterclockwise, take out the key lock 6 with the block 9, and then repeat steps four to eight.

[0071] Example 2: Fig.12 As shown, in this embodiment, the key lock 6 of embodiment 1 is replaced with a handle structure, wherein the handle structure includes a handle 1, a rotating block 1001, and a connecting rod 1002. The rotating block 1001 is cylindrical, and the connecting rod 1002 is fixed inside the rotating block 1001. A circular ring-shaped rotating plate 1003 is fixed at the lower end of the rotating block 1001. The lower end of the rotating block 1001 is inserted into the first circular through hole 813 of the clamping plate 8, and the upper end of the core shaft 5 is inserted into the rotating block 1 Inside 001, the rotating plate 1003 of the rotating block 1001 is located on the bottom wall of the second placement circular groove 812, the thickness of the rotating plate 1003 is consistent with the depth of the second placement circular groove 812, the clamping block 9 is sleeved on the rotating block 1001, the clamping block 9 is clamped with the clamping plate 8, the bottom of the clamping block 9 is against the top of the rotating plate 1003, the clamping block 9 and the clamping plate 8 are used to limit the rotating block, and at the same time, the handle 1 is fixedly connected to the rotating block 1001 through the connecting rod 1002.

[0072] Example 3: Fig.13 As shown, the positioning box 3 of this embodiment is a cube, the top area of ​​the card board 8 of this embodiment is consistent with the top area of ​​the positioning box 3, and the top area of ​​the panel frame 2 is consistent with the top area of ​​the card board 8.

[0073] Example 4: Fig.14 As shown, in this embodiment, the key lock 6 of embodiment 3 is replaced with a handle structure, and its handle structure is consistent with the handle structure of embodiment 2.

[0074] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A switch for convenient key replacement, comprising a handle (1), a panel frame (2), a positioning box (3), and a contact box (4) arranged in order from top to bottom, a core shaft (5) is provided in the positioning box (3) and the contact box (4), a key lock (6) is provided inside the handle (1), and the core shaft (5) is drivingly connected to the key lock (6), characterized in that: A quick-change mechanism (7) is provided between the positioning box (3) and the panel frame (2), the quick-change mechanism (7) comprising a card plate (8) and a card block (9), a limit plate (611) is fixedly provided at the bottom of the key lock (6), the limit plate (611) is inserted into the card plate (8), the card block (9) is sleeved on the outer wall of the key lock (6), the bottom of the card block (9) abuts against the top of the limit plate (611), and the card block (9) is carded with the card plate (8); The card plate (8) is a square block, the top of the card plate (8) is provided with a first circular placement groove (811), the bottom of the first circular placement groove (811) is provided with a second circular placement groove (812), the center of the bottom wall of the second circular placement groove (812) is provided with a first circular through hole (813), and the upper end of the core shaft (5) is inserted into the first circular through hole (813); The inner side wall circumferential array of the second placement circular groove (812) has two first limiting blocks (814) in a square shape, the limiting plate (611) is in a circular ring shape, the limiting plate (611) is provided with first limiting grooves (612) corresponding to the two first limiting blocks (814), and the limiting plate (611) is inserted into the second placement circular groove (812) of the card plate (8) through the two first limiting grooves (612) and the first limiting blocks (814) corresponding thereto; Four baffles (815) are arranged in a circular array on the upper end of the side wall of the first placement circular groove (811), the cross section of each baffle (815) is fan-shaped, and each baffle (815) is provided with a stop plate (816) on the side close to the next baffle (815) in the clockwise direction, and the bottom of each stop plate (816) is fixedly connected to the bottom wall of the first placement circular groove (811); The card block (9) is in the shape of a ring. The thickness of the card block (9) is consistent with the thickness of the first placement circular groove (811). Four plug plates (911) are arranged in a circular array on the outer wall of the card block (9). The cross-sections of the four plug plates (911) are all fan-shaped. Each plug plate (911) is provided with a plug block (912) on the side close to the next plug plate (911) in the clockwise direction. The plug block (912) is fan-shaped. A card slot (913) is provided at the top of each plug block (912) at one end away from the corresponding plug plate (911). Two semicircular protrusions (817) are fixedly provided at the bottom of each baffle (815) at the position of the corresponding card slot (913).

2. A key-changing switch according to claim 1, characterized in that: The arc length between the sides of each two baffles (815) close to each other is twice the arc length of the side wall corresponding to the outer diameter of the baffle (815), and the thickness of the baffle (815) is half the depth of the first placement circular groove (811).

3. A key-changing switch according to claim 2, characterized in that: The thickness of the insert block (912) is consistent with the distance from the bottom of the baffle (815) to the bottom wall of the first placement circular groove (811), the arc length of the side wall corresponding to the outer diameter of the insert block (911) is consistent with the arc length of the side wall corresponding to the outer diameter of the baffle (815), and the arc length of the side wall corresponding to the outer diameter of the insert block (912) is four fifths of the arc length of the side wall corresponding to the outer diameter of the baffle (815).

4. A key-changing switch according to claim 3, characterized in that: The bottom wall of the first placement circular groove (811) is provided with four fan-shaped first clearance grooves (818) in a circumferential array, and the four first clearance grooves (818) are respectively located directly below the four baffles (815).

5. A key-convenient switch according to claim 1, characterized in that: The inner side wall circumferential array of the second placement circular groove (812) has two second limit blocks (819), and the angle formed by the two second limit blocks (819) and the adjacent first limit blocks (814) is 90°; The cross section of each second limiting block (819) is fan-shaped, and each second limiting block (819) is provided with an arc-shaped protrusion (820) on one side close to the center of the second placement circular groove (812); the limiting plate (611) is provided with a second limiting groove (613) corresponding to the two second limiting blocks (819) and the arc-shaped protrusion (820); the limiting plate (611) is inserted into the second placement circular groove (812) of the card plate (8) through the two second limiting grooves (613) and the corresponding second limiting blocks (819) and the arc-shaped protrusion (820); A second circular through hole (821) is provided on the bottom wall of the first placement circular groove (811), the top of the second limiting block (819), and the top of the arc-shaped protrusion (820); two third circular through holes (311) corresponding to the second circular through holes (821) are provided on the top of the positioning box (3); a first bolt (822) is provided in each of the second circular through holes (821); and each of the first bolts (822) passes through its corresponding third circular through hole (311) to be fixedly connected to the contact box (4).

6. A key-convenient switch according to claim 4, characterized in that: Each of the plug blocks (912) is fixedly connected to the card block (9); the card block (9) has four fan-shaped second clearance grooves (914) in a circumferential array at the bottom; the outer diameter of each of the second clearance grooves (914) is consistent with the outer diameter of the card block (9); the four second clearance grooves (914) correspond to the positions of four plug blocks (912) respectively; the arc length of the side wall corresponding to the outer diameter of each of the second clearance grooves (914) is two-thirds of the arc length of the side wall corresponding to the inner diameter of the plug block (912); and each of the second clearance grooves (914) is located on a side of the corresponding plug block (912) away from the plug board (911).

7. A key-convenient switch according to claim 6, characterized in that: The top circumferential array of the clamping block (9) is provided with four first waist-shaped grooves (915).

8. The key-changing switch according to claim 5, characterized in that: Two waist-shaped blocks (823) are fixedly provided at the bottom of the clamping plate (8), and the positions of the two waist-shaped blocks (823) are staggered with the positions of the two first circular through holes (813). The top of the positioning box (3) is provided with two second waist-shaped grooves (312) corresponding to the waist-shaped blocks (823).

9. The key-changing switch according to claim 1, characterized in that: The four corners of the top of the card plate (8) are provided with fourth circular through holes (824), the four corners of the bottom of the card plate (8) are provided with four hexagonal grooves (825), each of the hexagonal grooves (825) is provided with two triangular blocks (826), a second nut (827) is provided between the triangular blocks (826) and the inner top wall of the hexagonal groove (825), and the four corners of the top of the panel frame (2) are provided with four waist-shaped through holes (211), each of the waist-shaped through holes (211) is inserted with a second bolt (212), and each of the second bolts (212) passes through the fourth circular through hole (824) and is threadedly connected to its corresponding second nut (827).

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