An explosion-proof button core

Abstract

The present invention relates to the field of switch technology, and specifically to an explosion-proof button core, comprising a shell, a middle contact piece group, a side contact piece group, and a switching cylinder. An adjusting shaft is provided in the shell for sliding up and down; the adjusting shaft is connected to a mounting shaft for sliding up and down; two sections of upper threads and lower threads with opposite rotation directions are distributed on the side wall of the mounting shaft; the middle contact piece group comprises a middle moving contact piece and a middle static contact piece; the middle moving contact piece is threadedly connected to the mounting shaft at the upper thread through a threaded connection component; the side contact piece group comprises a side moving contact piece and a side static contact piece; the fixing frame is threadedly connected to the mounting shaft at the lower thread through a threaded connection component; when it is necessary to switch to a normally closed state of both contact pieces, the adjusting shaft is rotated, and the adjusting shaft drives the mounting shaft to rotate, driving the middle moving contact piece and the fixing frame to move away from each other, so that the middle moving contact piece moves up and the middle static contact piece closes, and the fixing frame drives the side moving contact piece to move down and the side static contact piece to close, so as to realize the switching of different contact pieces to the normally open or normally closed state.

Description

Technical Field

[0001] The invention relates to the technical field of switches, and in particular to an explosion-proof button core. Background Art

[0002] Explosion-proof buttons are also called explosion-proof control buttons. They are often used in explosive gas environments, combustible dust and other dangerous places. Explosion-proof buttons are generally installed in explosion-proof places such as distribution boxes, control boxes, and distribution cabinets. The emergence of explosion-proof buttons ensures the orderly development of life and production order. Button cores are generally used in explosion-proof electrical products in explosion-proof industries, such as explosion-proof distribution boxes, explosion-proof lamps, etc. as signals or electrical switches. Some electrical appliances need to install the button core on the cover of the electrical box (called top-mounted), and some electrical appliances or lamps need to install the button core on the bottom or side of the electrical box or lamp (called bottom-mounted).

[0003] In the prior art, such as in the Chinese patent with announcement number CN216288081U and the name of a dual-speed button core, a first static contact group and a second static contact group are arranged in the main shell, and a first moving contact group adapted to the first static contact group and a second moving contact group adapted to the second static contact group are arranged on the moving body. The first static contact group and the first moving contact group form a normally closed combination, and the second contact group and the second moving contact group form a normally open combination. After pressing the button rod, the moving body moves downward to separate the first static contact group and the first moving contact group, and continues to press downward to close and conduct the second static contact group and the second moving contact group, thereby realizing the switching between normally open and normally closed. However, when using this scheme, it is not convenient to adjust the first static contact group and the second static contact group to the normally closed or normally open state, and it has certain limitations. Summary of the invention

[0004] The present invention provides an explosion-proof button core to solve the above problem.

[0005] The explosion-proof button core of the present invention adopts the following technical scheme: an explosion-proof button core comprises a shell, a middle contact piece group, a side contact piece group, and a switching cylinder.

[0006] The outer shell is arranged front and back; a sealing cover is fixed on the upper end of the outer shell; a movable frame is slidable up and down in the outer shell; an adjusting shaft is arranged at the center of the movable frame; the adjusting shaft is vertically arranged and rotatably installed on the movable frame; the lower end of the adjusting shaft is slidably connected to the mounting shaft up and down through an elastic connecting component; two sections of upper and lower threads with opposite rotation directions are arranged on the side wall of the mounting shaft.

[0007] The middle contact piece group includes a middle moving contact piece and a middle static contact piece; the middle moving contact piece is arranged front and back; the middle moving contact piece and the movable frame slide together up and down; the middle moving contact piece is threadedly connected to the mounting shaft at the upper thread through a threaded connection component; there are two middle static contacts distributed front and back, and distributed just above the two ends of the middle moving contact piece; the middle static contact piece is fixed on the inner wall of the shell, and the wiring terminal of the middle static contact piece extends out of the shell.

[0008] The side contact piece group includes a side moving contact piece and a side static contact piece; there are two side moving contact pieces, which are distributed on the left and right sides of the middle moving contact piece; the two side moving contact pieces are fixedly connected by a fixing frame; the fixing frame is arranged below the middle moving contact piece; the fixing frame is threadedly connected to the mounting shaft at the lower thread through a threaded connection assembly; there are two side static contact pieces distributed front and back, and are distributed directly below the two ends of the side moving contact piece; the side static contact piece is fixed on the inner wall of the shell, and the wiring terminal of the side static contact piece is extended out of the shell; initially, the side moving contact piece and the middle moving contact piece are on the same horizontal plane, and the side moving contact piece and the side static contact piece, as well as the middle moving contact piece and the middle static contact piece are all in a normally open state.

[0009] The switching cylinder is coaxially sleeved on the adjusting shaft; the switching cylinder is rotatably mounted on the upper end of the movable frame and is rotatably matched with the adjusting shaft; the switching cylinder and the cover can rotate and slide up and down; a limit assembly is provided between the switching cylinder and the cover; after the switching cylinder rotates a preset angle, the limit assembly drives the switching cylinder to move up and down a preset distance to achieve the closure of the middle contact piece group or the side contact piece group, and then locks the switching cylinder on the cover. At the beginning, the middle moving contact and the middle static contact are normally open, and the side moving contact and the side static contact are normally open. When it is necessary to switch to the coexistence state of the side contact group being normally open and the middle contact group being normally closed, the limit assembly drives the switching cylinder to drive the adjusting shaft to move up a preset distance through the moving frame, so that the middle moving contact moves up and the middle static contact closes. When it is necessary to switch to the coexistence state of the side contact group being normally closed and the middle contact group being normally open, the limit assembly drives the switching cylinder to drive the adjusting shaft to move down a preset distance through the moving frame, so that the side moving contact moves down and the side static contact closes; when it is necessary to switch to the state where both the side contact group and the middle contact group are in the normally closed state, in the initial state, the adjusting shaft is rotated, and the adjusting shaft drives the mounting shaft to rotate, driving the middle moving contact and the fixed frame to move away from each other, so that the middle moving contact moves up and the middle static contact closes, and the fixed frame drives the side moving contact to move down and the side static contact closes.

[0010] Furthermore, the elastic connection component includes a sliding hole and a sliding column; the sliding hole is arranged at the lower end of the adjusting shaft; the sliding column is coaxially fixed to the upper end of the mounting shaft; the sliding column is inserted into the sliding hole so as to slide up and down; a buffer spring is fixedly connected between the upper end of the sliding column and the hole wall of the sliding hole. The buffer spring has three main functions. The first function is to buffer the impact force between the middle moving contact piece and the middle static contact piece or between the side moving contact piece and the side static contact piece when switching to the closed state. The second function is that when the switching cylinder drives the adjusting shaft to move up and down, the adjusting shaft drives the mounting shaft to move up and down synchronously through the buffer spring; the third function is that when the adjusting shaft is rotated, the adjusting shaft drives the mounting shaft to rotate, driving the middle moving contact piece and the fixed frame to move away from each other, so that the middle moving contact piece moves up and the middle static contact piece closes, and when the fixed frame drives the side moving contact piece to move down and the side static contact piece to close, after the middle moving contact piece moves up and the middle static contact piece abuts and closes, the adjusting shaft continues to rotate so that the mounting shaft overcomes the elastic force of the buffer spring and moves downward relative to the adjusting shaft to ensure that the side moving contact piece continues to move down and the side static contact piece abuts and closes, or when the side moving contact piece moves down and the side static contact piece abuts and closes, the adjusting shaft continues to rotate so that the mounting shaft overcomes the elastic force of the buffer spring and moves upward relative to the adjusting shaft to ensure that the middle moving contact piece continues to move up and the middle static contact piece abuts and closes.

[0011] Furthermore, the limiting assembly includes a card block, an initial groove, a first switching groove, a second switching groove, and a transfer groove; the card block is arranged in the outer shell; the card block is installed at the lower end of the cover along the radial sliding of the switching cylinder; a push spring is fixedly connected between the card block and the cover; the card block is wedge-shaped with the small end facing the switching cylinder.

[0012] The initial groove, the first switching groove and the second switching groove are distributed on the outer side wall of the switching cylinder along the circumference of the switching cylinder; the initial groove, the first switching groove and the second switching groove are all V-shaped grooves with the small ends facing the axis of the switching cylinder; the two inclined groove walls of the V-shaped groove formed by the initial groove, the first switching groove and the second switching groove are distributed up and down; and the distance between the small end of the initial groove and the upper end of the switching cylinder is smaller than the distance between the small end of the first switching groove and the upper end of the switching cylinder, and the distance between the small end of the initial groove and the upper end of the switching cylinder is larger than the distance between the small end of the second switching groove and the upper end of the switching cylinder; initially, the push spring presses the small end of the block against the small end of the initial groove, so that the middle moving contact piece and the side moving contact piece are between the middle static contact piece and the side static contact piece, and at this time, the middle contact piece group and the side contact piece group are both in the normally open state.

[0013] The transfer groove is an annular groove, which is opened on the outer wall of the switching cylinder and is located below the initial groove, the first switching groove and the second switching groove; the lower end of the initial groove is connected to the transfer groove; the lower end of the first switching groove is connected to the transfer groove; the lower end of the second switching groove is connected to the transfer groove.

[0014] When in use, initially, the small end of the card block presses against the small end of the initial slot, and the middle contact piece group and the side contact piece group are both in the normally open state; when it is necessary to switch to the coexistence state of the side contact piece group being normally open and the middle contact piece group being normally closed, the switching cylinder is pulled up relative to the outer shell by hand, so that the card block overcomes the elastic force of the push spring and moves away from the switching cylinder along the inclined slot wall below the initial slot until the small end of the card block slides into the transfer slot, and then, the switching cylinder is turned by hand to make the first switching slot turn to the card block, and the switching cylinder is released. Driven by the elastic force of the push spring, the small end of the card block is inserted into the first switching slot along the inclined slot wall below the first switching slot and presses against the small end of the first switching slot, so that after driving the switching cylinder to move up a preset distance relative to the initial position, the switching cylinder is restricted from moving up and down, so that the switching cylinder drives the adjusting shaft to move up a preset distance through the moving frame, so that the middle moving contact piece moves up and the middle static contact piece closes, and the side moving contact piece and the side static contact piece are normally open.

[0015] Similarly, when it is necessary to switch to the coexistence state of the side contact group being normally closed and the middle contact group being normally open, the card block is switched to the second switching slot, and the small end of the card block is pressed against the small end of the second switching slot, so that after driving the switching cylinder to move down a preset distance relative to the initial position, the switching cylinder is restricted from moving up and down, so that the switching cylinder drives the adjustment shaft to move down a preset distance through the moving frame, so that the side moving contact moves down and the side static contact is closed. When it is necessary to switch to the state where both the side contact group and the middle contact group are in the normally closed state, the card block is first switched to the initial slot, and then in the initial state, the adjustment shaft is rotated, and the adjustment shaft drives the installation shaft to rotate, driving the middle moving contact and the fixed frame away from each other, so that the middle moving contact moves up and the middle static contact is closed, and the fixed frame drives the side moving contact to move down and the side static contact is closed, and the middle moving contact and the middle static contact are normally open.

[0016] Furthermore, a ball is rotatably mounted at the small end of the block.

[0017] Furthermore, a quick-cut groove group is provided on the side wall of the switching cylinder; the quick-cut groove group is used to increase the speed of switching the opening and closing states of the middle contact piece group and the side contact piece group.

[0018] Furthermore, the quick-cut groove group includes an upper switching groove and a lower switching groove; the upper switching groove is located above the lower switching groove, and both the upper switching groove and the lower switching groove are V-shaped grooves with their small ends facing the axis of the switching cylinder; the two inclined groove walls forming the V-shaped groove by the upper switching groove and the lower switching groove are distributed up and down; the distance between the small end of the upper switching groove and the upper end of the switching cylinder is equal to the distance between the small end of the second switching groove and the upper end of the switching cylinder; the distance between the small end of the lower switching groove and the upper end of the switching cylinder is equal to the distance between the small end of the first switching groove and the upper end of the switching cylinder; the lower end of the lower switching groove is connected to the transfer groove.

[0019] When it is necessary to quickly switch the opening and closing states of the middle contact group and the side contact group, pull up the switching cylinder relative to the housing by hand to switch the card block to the lower switching groove, and the small end of the card block presses against the small end of the lower switching groove. At this time, the middle moving contact moves up and the middle static contact closes, and the side moving contact and the side static contact are normally open. Press the switching cylinder downward, and the inclined groove wall above the lower switching groove drives the card block away from the switching cylinder and slides into the upper switching groove. The small end of the card block presses against the small end of the upper switching groove. At this time, the side moving contact moves down and the side static contact closes, and the middle moving contact and the middle static contact are normally open.

[0020] Furthermore, contact point protrusions are fixed at the abutting points of the middle moving contact piece and the middle static contact piece, and at the abutting points of the side moving contact piece and the side static contact piece.

[0021] Furthermore, the contact point bumps are plated with metallic silver.

[0022] Further, the threaded connection assembly includes an upper structure and a lower structure;

[0023] The upper structure includes an upper threaded plate; the upper threaded plate is radially slidably arranged above the middle moving contact piece along the switching cylinder; the upper threaded plate is in an arc shape, and an upper cross bar is fixed to the end of the upper threaded plate away from the mounting shaft; the upper cross bar is radially arranged along the mounting shaft; the upper cross bar is radially slidably installed on the middle moving contact piece along the mounting shaft; an upper pressure spring is connected between the upper cross bar and the middle moving contact piece; the upper pressure spring makes the upper threaded plate and the mounting shaft grounded, and cooperates with the mounting shaft thread at the upper thread;

[0024] The lower structure includes a lower thread plate; the lower thread plate is radially slidably arranged below the fixing frame along the switching cylinder; the lower thread plate is in an arc shape, and a lower cross bar is fixed to the end of the lower thread plate away from the mounting shaft; the lower cross bar is radially arranged along the mounting shaft; the lower cross bar is radially slidably installed on the fixing frame along the mounting shaft; a lower top pressure spring is connected between the lower cross bar and the fixing frame; the lower top pressure spring makes the lower thread plate and the mounting shaft connected to each other, and cooperates with the mounting shaft thread at the lower thread. When the middle moving contact piece and the side moving contact piece need to be replaced, only the upper cross bar or the lower cross bar is pulled by hand to make the upper cross bar or the lower cross bar away from the mounting shaft, so that the upper thread plate or the lower thread plate is separated from the mounting shaft, thereby removing the middle moving contact piece and the side moving contact piece, making the middle moving contact piece and the side moving contact piece easy to operate during maintenance.

[0025] Furthermore, the shell and the cover are sealed by resin infusion, thereby improving the explosion-proof performance.

[0026] The beneficial effects of the present invention are: 1. Initially, the middle moving contact and the middle static contact are normally open, and the side moving contact and the side static contact are normally open. When it is necessary to switch to the coexistence state of the side contact group being normally open and the middle contact group being normally closed, the limit assembly drives the switching cylinder to drive the adjusting shaft to move up a preset distance through the moving frame, so that the middle moving contact moves up and the middle static contact closes. When it is necessary to switch to the coexistence state of the side contact group being normally closed and the middle contact group being normally open, the limit assembly drives the switching cylinder to drive the adjusting shaft to move down a preset distance through the moving frame, so that the side moving contact moves down and the side static contact closes; when it is necessary to switch to the state where both the side contact group and the middle contact group are in the normally closed state, in the initial state, the adjusting shaft is rotated, and the adjusting shaft drives the mounting shaft to rotate, driving the middle moving contact and the fixed frame to move away from each other, so that the middle moving contact moves up and the middle static contact closes, and the fixed frame drives the side moving contact to move down and the side static contact closes. According to different working conditions, different contact groups can be switched to normally open or normally closed states, and the operation is simple, convenient and fast.

[0027] 2. When switching to the closed state, the buffer spring buffers the impact force between the middle moving contact piece and the middle static contact piece or between the side moving contact piece and the side static contact piece during contact, thereby reducing the probability of damage between the middle moving contact piece and the middle static contact piece or between the side moving contact piece and the side static contact piece during closing and pressing.

[0028] 3. When the switching cylinder drives the adjusting shaft to move up and down, the adjusting shaft drives the installing shaft to move up and down synchronously through the buffer spring; the third function is to rotate the adjusting shaft, and the adjusting shaft drives the installing shaft to rotate, driving the middle moving contact piece and the fixing frame to move away from each other, so that the middle moving contact piece moves up and the middle static contact piece closes, and the fixing frame drives the side moving contact piece to move down and the side static contact piece to close, when the middle moving contact piece moves up and the middle static contact piece abuts and closes, continue to rotate the adjusting shaft, so that the installing shaft overcomes the elastic force of the buffer spring and moves downward relative to the adjusting shaft, so as to ensure that the side moving contact piece continues to move down and the side static contact piece abuts and closes, or when the side moving contact piece moves down and the side static contact piece abuts and closes, continue to rotate the adjusting shaft, so that the installing shaft overcomes the elastic force of the buffer spring and moves upward relative to the adjusting shaft, so as to ensure that the middle moving contact piece continues to move up and the middle static contact piece abuts and closes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 or the description of the prior art 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 labor.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of an explosion-proof button core of the present invention;

[0031] Figure 2 It is a front view of an embodiment of an explosion-proof button core of the present invention;

[0032] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0033] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0034] Figure 5 A side view of an embodiment of an explosion-proof button core of the present invention;

[0035] Figure 6 for Figure 5 Sectional view at CC;

[0036] Figure 7 for Figure 6 The enlarged view of point D in the middle;

[0037] Figure 8 This is a state diagram of an explosion-proof button core in an embodiment of the present invention when the middle contact piece group is closed and the side contact piece group is normally open;

[0038] Fig. 9 This is a state diagram of an explosion-proof button core in an embodiment of the present invention when the middle contact piece group is normally open and the side contact piece group is closed;

[0039] Fig.10 This is a state diagram of a block of an embodiment of an explosion-proof button core of the present invention when it is in a quick-cut groove group;

[0040] Fig.11 This is a state diagram of a middle contact piece group and a side contact piece group in an embodiment of an explosion-proof button core of the present invention when they are switched from all normally open to all closed;

[0041] Fig.12 An exploded view of an embodiment of an explosion-proof button core of the present invention;

[0042] Fig.13 It is a schematic diagram of a fixing frame and a side moving contact piece of an embodiment of an explosion-proof button core of the present invention;

[0043] Fig.14 A schematic diagram of a switching cylinder of an embodiment of an explosion-proof button core of the present invention.

[0044] In the figure: 100, housing; 110, cover; 120, movable frame; 200, adjusting shaft; 210, sliding hole; 300, mounting shaft; 310, sliding column; 320, buffer spring; 410, middle moving contact piece; 420, middle static contact piece; 510, side moving contact piece; 520, side static contact piece; 530, fixed frame; 611, upper threaded plate; 612, upper cross bar; 613, upper pressure spring; 621, lower threaded plate; 622, lower cross bar; 623, lower pressure spring; 710, block; 711, push spring; 721, initial slot; 722, first switching slot; 723, second switching slot; 724, transfer slot; 725, upper switching slot; 726, lower switching slot; 800, switching cylinder. DETAILED DESCRIPTION

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] An embodiment of an explosion-proof button core of the present invention is as follows Figures 1 to 14 As shown: an explosion-proof button core, including a shell 100, a middle contact piece group, a side contact piece group, and a switching cylinder 800.

[0047] The housing 100 is arranged front and back; a cover 110 is fixed on the upper end of the housing 100; the housing 100 and the cover 110 are sealed by resin infusion, which improves the explosion-proof performance. A moving frame 120 is slidable up and down in the housing 100; an adjusting shaft 200 is arranged at the center of the moving frame 120; the adjusting shaft 200 is vertically arranged and rotatably mounted on the moving frame 120; the lower end of the adjusting shaft 200 is slidably connected to the installation shaft 300 through an elastic connection component; two sections of upper and lower threads with opposite rotation directions are arranged on the side wall of the installation shaft 300; the elastic connection component includes a sliding hole 210 and a sliding column 310; the sliding hole 210 is arranged at the lower end of the adjusting shaft 200; the sliding column 310 is coaxially fixed to the upper end of the installation shaft 300; the sliding column 310 is inserted into the sliding hole 210 in a sliding manner up and down; a buffer spring 320 is fixedly connected between the upper end of the sliding column 310 and the hole wall of the sliding hole 210. The buffer spring 320 has three main functions. The first function is to buffer the impact force between the middle moving contact piece 410 and the middle static contact piece 420 or between the side moving contact piece 510 and the side static contact piece 520 when switching the closed state. The second function is to drive the adjustment shaft 200 to move up and down when the switching cylinder 800 drives the adjustment shaft 200 to drive the installation shaft 300 to move up and down synchronously through the buffer spring 320. The third function is to rotate the adjustment shaft 200, and the adjustment shaft 200 drives the installation shaft 300 to rotate, driving the middle moving contact piece 410 and the fixing frame 530 to move away from each other, so that the middle moving contact piece 410 moves up and the middle static contact piece 420 closes, and the fixing frame When 530 drives the moving contact piece 510 to move downward and the static contact piece 520 to close, after the middle moving contact piece 410 moves upward and the middle static contact piece 420 abuts and closes, the adjusting shaft 200 continues to be rotated so that the mounting shaft 300 overcomes the elastic force of the buffer spring 320 and moves downward relative to the adjusting shaft 200 to ensure that the moving contact piece 510 continues to move downward and the static contact piece 520 abuts and closes, or when the moving contact piece 510 moves downward and the static contact piece 520 abuts and closes, the adjusting shaft 200 continues to be rotated so that the mounting shaft 300 overcomes the elastic force of the buffer spring 320 and moves upward relative to the adjusting shaft 200 to ensure that the middle moving contact piece 410 continues to move upward and the middle static contact piece 420 abuts and closes.

[0048] The middle contact piece group includes a middle moving contact piece 410 and a middle static contact piece 420; the middle moving contact piece 410 is arranged front and back; the middle moving contact piece 410 and the movable frame 120 slide together up and down; the middle moving contact piece 410 is threadedly connected to the mounting shaft 300 at the upper thread through a threaded connection component; there are two middle static contact pieces 420 distributed front and back, and distributed directly above the two ends of the middle moving contact piece 410; the middle static contact piece 420 is fixed on the inner wall of the outer shell 100, and the wiring terminal of the middle static contact piece 420 extends out of the outer shell 100.

[0049] The side contact piece group includes a side moving contact piece 510 and a side static contact piece 520; there are two side moving contact pieces 510, which are distributed on the left and right sides of the middle moving contact piece 410; the two side moving contact pieces 510 are fixedly connected by a fixing frame 530; the fixing frame 530 is arranged below the middle moving contact piece 410; the fixing frame 530 is threadedly connected to the mounting shaft 300 at the lower thread through a threaded connection assembly; the threaded connection assembly includes an upper structure and a lower structure; the upper structure includes an upper threaded plate 611; the upper threaded plate 611 is radially slidably arranged above the middle moving contact piece 410 along the switching cylinder 800; the upper threaded plate 611 is in an arc shape, and an upper cross bar 612 is fixed to the end of the upper threaded plate 611 away from the mounting shaft 300; the upper cross bar 612 is radially arranged along the mounting shaft 300; the upper cross bar 612 is radially slidably installed on the middle moving contact piece 410 along the mounting shaft 300; the upper An upper pressure spring 613 is connected between the cross bar 612 and the middle moving contact piece 410; the upper pressure spring 613 connects the upper threaded plate 611 to the installation shaft 300, and is threadedly matched with the installation shaft 300 at the upper thread; the lower structure includes a lower threaded plate 621; the lower threaded plate 621 is arranged below the fixing frame 530 to slide radially along the switching cylinder 800; the lower threaded plate 621 is in an arc shape, and a lower cross bar 622 is fixed to the end of the lower threaded plate 621 away from the installation shaft 300; the lower cross bar 622 is arranged radially along the installation shaft 300; the lower cross bar 622 is radially slidably installed on the fixing frame 530 along the installation shaft 300; a lower pressure spring 623 is connected between the lower cross bar 622 and the fixing frame 530; the lower pressure spring 623 connects the lower threaded plate 621 to the installation shaft 300, and is threadedly matched with the installation shaft 300 at the lower thread. When the middle moving contact piece 410 and the side moving contact piece 510 need to be replaced, one only needs to pull the upper cross bar 612 or the lower cross bar 622 by hand to move the upper cross bar 612 or the lower cross bar 622 away from the mounting shaft 300, so that the upper threaded plate 611 or the lower threaded plate 621 is disengaged from the mounting shaft 300, thereby removing the middle moving contact piece 410 and the side moving contact piece 510, making it easy to operate the middle moving contact piece 410 and the side moving contact piece 510 during maintenance.

[0050] There are two side static contact pieces 520 distributed front and back, and are distributed directly below the two ends of the side moving contact piece 510; the side static contact piece 520 is fixed on the inner wall of the shell 100, and the connection terminal of the side static contact piece 520 is extended out of the shell 100; initially, the side moving contact piece 510 and the middle moving contact piece 410 are on the same horizontal plane, and the side moving contact piece 510 and the side static contact piece 520, as well as the middle moving contact piece 410 and the middle static contact piece 420 are all in a normally open state.

[0051] The switching cylinder 800 is coaxially sleeved on the adjusting shaft 200; the switching cylinder 800 is rotatably mounted on the upper end of the movable frame 120 and is rotatably matched with the adjusting shaft 200; the switching cylinder 800 and the cover 110 are rotatable and can slide up and down; a limit assembly is provided between the switching cylinder 800 and the cover 110; after the switching cylinder 800 rotates a preset angle, the limit assembly drives the switching cylinder 800 to move up and down a preset distance to achieve the closure of the middle contact piece group or the side contact piece group, and then locks the switching cylinder 800 on the cover 110. At the beginning, the middle moving contact piece 410 and the middle static contact piece 420 are normally open, and the side moving contact piece 510 and the side static contact piece 520 are normally open. When it is necessary to switch to the state where the side contact piece group is normally open and the middle contact piece group is normally closed, the limit assembly drives the switching cylinder 800 to drive the adjustment shaft 200 to move up a preset distance through the moving frame 120, so that the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed. When it is necessary to switch to the state where the side contact piece group is normally closed and the middle contact piece group is normally open, the limit assembly drives the switching cylinder 800 to drive the adjustment shaft 200 to move up a preset distance through the moving frame 120, so that the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed. 20 drives the adjustment shaft 200 to move downward a preset distance, so that the side moving contact piece 510 moves downward and the side static contact piece 520 is closed; when it is necessary to switch to the normally closed state of both the side contact piece group and the middle contact piece group, in the initial state, the adjustment shaft 200 is rotated, and the adjustment shaft 200 drives the installation shaft 300 to rotate, driving the middle moving contact piece 410 and the fixing frame 530 to move away from each other, so that the middle moving contact piece 410 moves upward and the middle static contact piece 420 is closed, and the fixing frame 530 drives the side moving contact piece 510 to move downward and the side static contact piece 520 to close.

[0052] The limiting assembly includes a block 710, an initial groove 721, a first switching groove 722, a second switching groove 723, and a transfer groove 724; the block 710 is arranged in the housing 100; the block 710 is radially slidably installed on the lower end of the cover 110 along the switching cylinder 800; a push spring 711 is fixedly connected between the block 710 and the cover 110; the block 710 is wedge-shaped with the small end facing the switching cylinder 800; a ball is rotatably installed at the small end of the block 710.

[0053] The initial groove 721, the first switching groove 722, and the second switching groove 723 are distributed on the outer wall of the switching cylinder 800 along the circumference of the switching cylinder 800; the initial groove 721, the first switching groove 722, and the second switching groove 723 are all V-shaped grooves with the small ends facing the axis of the switching cylinder 800; the two inclined groove walls of the V-shaped groove formed by the initial groove 721, the first switching groove 722, and the second switching groove 723 are both distributed up and down; and the distance from the small end of the initial groove 721 to the upper end of the switching cylinder 800 is less than the distance from the small end of the first switching groove 722 to the upper end of the switching cylinder 800, and the distance from the small end of the initial groove 721 to the upper end of the switching cylinder 800 is greater than the distance from the small end of the second switching groove 723 The distance from the upper end of the switching cylinder 800; initially, the push spring 711 presses the small end of the block 710 against the small end of the initial groove 721, so that the middle moving contact piece 410 and the side moving contact piece 510 are between the middle static contact piece 420 and the side static contact piece 520, at this time, the middle contact piece group and the side contact piece group are both in the normally open state; the transfer groove 724 is an annular groove, which is opened on the outer wall of the switching cylinder 800 and is below the initial groove 721, the first switching groove 722, and the second switching groove 723; the lower end of the initial groove 721 is connected to the transfer groove 724; the lower end of the first switching groove 722 is connected to the transfer groove 724; the lower end of the second switching groove 723 is connected to the transfer groove 724.

[0054] A quick-cut groove group is also provided on the side wall of the switching cylinder 800; the quick-cut groove group is used to increase the speed of switching the opening and closing states of the middle contact piece group and the side contact piece group. The quick-cut groove group includes an upper switching groove 725 and a lower switching groove 726; the upper switching groove 725 is located above the lower switching groove 726, and both the upper switching groove 725 and the lower switching groove 726 are V-shaped grooves with the small ends facing the axis of the switching cylinder 800; the two inclined groove walls of the V-shaped groove formed by the upper switching groove 725 and the lower switching groove 726 are both distributed up and down; the distance between the small end of the upper switching groove 725 and the upper end of the switching cylinder 800 is equal to the distance between the small end of the second switching groove 723 and the upper end of the switching cylinder 800; the distance between the small end of the lower switching groove 726 and the upper end of the switching cylinder 800 is equal to the distance between the small end of the first switching groove 722 and the upper end of the switching cylinder 800; the lower end of the lower switching groove 726 is connected to the transfer groove 724.

[0055] When in use, initially, the small end of the card block 710 is pressed against the small end of the initial groove 721, and the middle contact piece group and the side contact piece group are both in the normally open state; when it is necessary to switch to the coexistence state of the side contact piece group being normally open and the middle contact piece group being normally closed, the switching cylinder 800 is pulled up relative to the housing 100 by hand, so that the card block 710 overcomes the elastic force of the push spring 711 and moves away from the switching cylinder 800 along the inclined groove wall below the initial groove 721 until the small end of the card block 710 slides into the transfer groove 724, and then the switching cylinder 800 is rotated by hand to make the first switching groove 722 rotate to the card block 710, and the switching cylinder 800 is released. Open the switching cylinder 800. Driven by the elastic force of the push spring 711, the small end of the block 710 is inserted into the first switching groove 722 along the inclined groove wall below the first switching groove 722 and pressed against the small end of the first switching groove 722. After driving the switching cylinder 800 to move up a preset distance relative to the initial position, the switching cylinder 800 is restricted from moving up and down, so that the switching cylinder 800 drives the adjustment shaft 200 to move up a preset distance through the moving frame 120, so that the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed, and the side moving contact piece 510 and the side static contact piece 520 are normally open.

[0056] Similarly, when it is necessary to switch to the coexistence state of the side contact group being normally closed and the middle contact group being normally open, the block 710 is switched to the second switching slot 723, and the small end of the block 710 is pressed against the small end of the second switching slot 723, thereby driving the switching cylinder 800 to move downward a preset distance relative to the initial position, and limiting the upward and downward movement of the switching cylinder 800, so that the switching cylinder 800 drives the adjustment shaft 200 to move downward a preset distance through the moving frame 120, so that the side moving contact 510 moves downward and the side static contact 520 is closed. When it is necessary to switch to the normally closed state of both the side contact group and the middle contact group, first switch the block 710 to the initial slot 721, and then in the initial state, rotate the adjusting shaft 200, and the adjusting shaft 200 drives the mounting shaft 300 to rotate, driving the middle moving contact 410 and the fixing frame 530 to move away from each other, so that the middle moving contact 410 moves up and the middle static contact 420 is closed, and the fixing frame 530 drives the side moving contact 510 to move down and the side static contact 520 to close, and the middle moving contact 410 and the middle static contact 420 are normally open.

[0057] When it is necessary to quickly switch the opening and closing states of the middle contact group and the side contact group, pull up the switching cylinder 800 relative to the housing 100 by hand, switch the card block 710 to the lower switching groove 726, and the small end of the card block 710 presses against the small end of the lower switching groove 726. At this time, the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed, and the side moving contact piece 510 and the side static contact piece 520 are normally open. Press the switching cylinder 800 downward, and the inclined groove wall above the lower switching groove 726 drives the card block 710 away from the switching cylinder 800 and slides into the upper switching groove 725. The small end of the card block 710 presses against the small end of the upper switching groove 725. At this time, the side moving contact piece 510 moves down and the side static contact piece 520 is closed, and the middle moving contact piece 410 and the middle static contact piece 420 are normally open.

[0058] In this embodiment, contact point bumps are fixed at the abutting points of the middle moving contact piece 410 and the middle static contact piece 420 and at the abutting points of the side moving contact piece 510 and the side static contact piece 520 , and the contact point bumps are plated with metallic silver.

[0059] In combination with the above embodiments, the use principle and working process of the present invention are as follows: when in use, initially, the small end of the block 710 is pressed against the small end of the initial slot 721, and the middle contact piece group and the side contact piece group are both in a normally open state; when it is necessary to switch to a coexistence state of the side contact piece group being normally open and the middle contact piece group being normally closed, the switching cylinder 800 is pulled up relative to the housing 100 by hand, so that the block 710 overcomes the elastic force of the push spring 711 and moves away from the switching cylinder 800 along the inclined slot wall below the initial slot 721 until the small end of the block 710 slides into the transfer slot 724, and then the switching cylinder 80 is rotated by hand. 0, the first switching groove 722 is rotated to the block 710, the switching cylinder 800 is released, and the small end of the block 710 is inserted into the first switching groove 722 along the inclined groove wall below the first switching groove 722 under the elastic force of the push spring 711, and is pressed against the small end of the first switching groove 722, so that after driving the switching cylinder 800 to move up a preset distance relative to the initial position, the switching cylinder 800 is restricted from moving up and down, so that the switching cylinder 800 drives the adjustment shaft 200 to move up a preset distance through the moving frame 120, so that the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed.

[0060] Similarly, when it is necessary to switch to the coexistence state of the side contact group being normally closed and the middle contact group being normally open, the block 710 is switched to the second switching slot 723, and the small end of the block 710 is pressed against the small end of the second switching slot 723, thereby driving the switching cylinder 800 to move downward a preset distance relative to the initial position, and limiting the upward and downward movement of the switching cylinder 800, so that the switching cylinder 800 drives the adjustment shaft 200 to move downward a preset distance through the moving frame 120, so that the side moving contact 510 moves downward and the side static contact 520 is closed. When it is necessary to switch to the normally closed state of both the side contact group and the middle contact group, first switch the block 710 to the initial slot 721, and then in the initial state, rotate the adjustment shaft 200, and the adjustment shaft 200 drives the installation shaft 300 to rotate, driving the middle moving contact 410 and the fixing frame 530 to move away from each other, so that the middle moving contact 410 moves up and the middle static contact 420 closes, and the fixing frame 530 drives the side moving contact 510 to move down and the side static contact 520 to close.

[0061] When it is necessary to quickly switch the opening and closing states of the middle contact group and the side contact group, pull up the switching cylinder 800 relative to the housing 100 by hand, switch the card block 710 to the lower switching groove 726, and the small end of the card block 710 presses against the small end of the lower switching groove 726. At this time, the middle moving contact piece 410 moves up and the middle static contact piece 420 is closed, and the side moving contact piece 510 and the side static contact piece 520 are normally open. Press the switching cylinder 800 downward, and the inclined groove wall above the lower switching groove 726 drives the card block 710 away from the switching cylinder 800 and slides into the upper switching groove 725. The small end of the card block 710 presses against the small end of the upper switching groove 725. At this time, the side moving contact piece 510 moves down and the side static contact piece 520 is closed, and the middle moving contact piece 410 and the middle static contact piece 420 are normally open.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof button core, characterized in that: include: The housing is arranged front and back; a cover is fixed on the upper end of the housing; a movable frame is slidable up and down in the housing; an adjusting shaft is arranged at the center of the movable frame; the adjusting shaft is arranged vertically and rotatably mounted on the movable frame; the lower end of the adjusting shaft is slidably connected to the mounting shaft up and down through an elastic connecting component; two sections of upper and lower threads with opposite rotation directions are arranged on the side wall of the mounting shaft; The middle contact piece group includes a middle moving contact piece and a middle static contact piece; the middle moving contact piece is arranged front and back; the middle moving contact piece and the moving frame slide together up and down; the middle moving contact piece is threadedly connected to the mounting shaft at the upper thread through a threaded connection component; two middle static contacts are arranged front and back, and are distributed just above the two ends of the middle moving contact piece; the middle static contact piece is fixed on the inner wall of the shell, and the wiring terminal of the middle static contact piece extends out of the shell; The side contact piece group includes a side moving contact piece and a side static contact piece; there are two side moving contact pieces, which are distributed on the left and right sides of the middle moving contact piece; the two side moving contact pieces are fixedly connected by a fixing frame; the fixing frame is arranged below the middle moving contact piece; the fixing frame is threadedly connected to the mounting shaft at the lower thread by a threaded connection assembly; there are two side static contact pieces distributed front and back, and they are distributed directly below the two ends of the side moving contact piece; the side static contact piece is fixed on the inner wall of the shell, and the wiring terminal of the side static contact piece is extended out of the shell; initially, the side moving contact piece and the middle moving contact piece are on the same horizontal plane, and the side moving contact piece and the side static contact piece, as well as the middle moving contact piece and the middle static contact piece are all in a normally open state; The switching cylinder is coaxially sleeved on the adjusting shaft; the switching cylinder is rotatably mounted on the upper end of the movable frame and is rotatably matched with the adjusting shaft; the switching cylinder and the cover can rotate and slide up and down; a limit assembly is provided between the switching cylinder and the cover; after the switching cylinder rotates a preset angle, the limit assembly drives the switching cylinder to move up and down a preset distance to achieve the closure of the middle contact piece group or the side contact piece group, and then locks the switching cylinder on the cover.

2. The explosion-proof button core according to claim 1, characterized in that: The elastic connection component includes a sliding hole and a sliding column; the sliding hole is arranged at the lower end of the adjusting shaft; the sliding column is coaxially fixed to the upper end of the mounting shaft; the sliding column is inserted into the sliding hole so as to slide up and down; a buffer spring is fixedly connected between the upper end of the sliding column and the hole wall of the sliding hole.

3. The explosion-proof button core according to claim 2, characterized in that: The limit assembly includes a card block, an initial slot, a first switching slot, a second switching slot, and a transfer slot; the card block is arranged in the housing; the card block is radially slidably mounted on the lower end of the cover along the switching cylinder; a push spring is fixedly connected between the card block and the cover; the card block is wedge-shaped with the small end facing the switching cylinder; The initial groove, the first switching groove and the second switching groove are distributed on the outer wall of the switching cylinder along the circumference of the switching cylinder; the initial groove, the first switching groove and the second switching groove are all V-shaped grooves with their small ends facing the axis of the switching cylinder; the two inclined groove walls of the V-shaped groove formed by the initial groove, the first switching groove and the second switching groove are distributed up and down; and the distance between the small end of the initial groove and the upper end of the switching cylinder is smaller than the distance between the small end of the first switching groove and the upper end of the switching cylinder, and the distance between the small end of the initial groove and the upper end of the switching cylinder is larger than the distance between the small end of the second switching groove and the upper end of the switching cylinder; initially, the push spring presses the small end of the block against the small end of the initial groove, so that the middle moving contact piece and the side moving contact piece are between the middle static contact piece and the side static contact piece, and at this time, the middle contact piece group and the side contact piece group are both in the normally open state; The transfer groove is an annular groove, which is opened on the outer wall of the switching cylinder and is located below the initial groove, the first switching groove and the second switching groove; the lower end of the initial groove is connected to the transfer groove; the lower end of the first switching groove is connected to the transfer groove; the lower end of the second switching groove is connected to the transfer groove.

4. The explosion-proof button core according to claim 3, characterized in that: A ball is rotatably mounted at the small end of the block.

5. The explosion-proof button core according to claim 4, characterized in that: A quick-cut groove group is also provided on the side wall of the switching cylinder; the quick-cut groove group is used to increase the speed of switching the opening and closing states of the middle contact piece group and the side contact piece group.

6. The explosion-proof button core according to claim 5, characterized in that: The quick-cut groove group includes an upper switching groove and a lower switching groove; the upper switching groove is located above the lower switching groove, and both the upper switching groove and the lower switching groove are V-shaped grooves with their small ends facing the axis of the switching cylinder; the two inclined groove walls forming the V-shaped groove by the upper switching groove and the lower switching groove are distributed up and down; the distance between the small end of the upper switching groove and the upper end of the switching cylinder is equal to the distance between the small end of the second switching groove and the upper end of the switching cylinder; the distance between the small end of the lower switching groove and the upper end of the switching cylinder is equal to the distance between the small end of the first switching groove and the upper end of the switching cylinder; the lower end of the lower switching groove is connected to the transfer groove.

7. The explosion-proof button core according to claim 1, characterized in that: The abutting positions of the middle moving contact piece and the middle static contact piece, and the abutting positions of the side moving contact piece and the side static contact piece are all fixed with contact point convex points.

8. The explosion-proof button core according to claim 7, characterized in that: The contact point bumps are plated with metallic silver.

9. The explosion-proof button core according to claim 1, characterized in that: The threaded connection assembly includes an upper structure and a lower structure; The upper structure includes an upper threaded plate; the upper threaded plate is radially slidably arranged above the middle moving contact piece along the switching cylinder; the upper threaded plate is in an arc shape, and an upper cross bar is fixed to the end of the upper threaded plate away from the mounting shaft; the upper cross bar is radially arranged along the mounting shaft; the upper cross bar is radially slidably installed on the middle moving contact piece along the mounting shaft; an upper pressure spring is connected between the upper cross bar and the middle moving contact piece; the upper pressure spring makes the upper threaded plate and the mounting shaft grounded, and cooperates with the mounting shaft thread at the upper thread; The lower structure includes a lower threaded plate; the lower threaded plate is radially slidably arranged below the fixing frame along the switching cylinder; the lower threaded plate is arc-shaped, and a lower cross bar is fixed to the end of the lower threaded plate away from the mounting shaft; the lower cross bar is radially arranged along the mounting shaft; the lower cross bar is radially slidably installed on the fixing frame along the mounting shaft; a lower top pressure spring is connected between the lower cross bar and the fixing frame; the lower top pressure spring connects the lower threaded plate to the mounting shaft, and cooperates with the mounting shaft thread at the lower thread.

10. The explosion-proof button core according to claim 1, characterized in that: The housing and the cover are sealed by resin injection.

Images