Drawing type electric travel switch

Abstract

The invention relates to a drawing type electric travel switch, which comprises a shell, a drawing sleeve, a feeler lever and a transposition ball, the drawing sleeve is fixedly connected with a limiting seat, the shell is internally provided with a limiting sleeve, a first spring, a static contact piece and a core shaft, one end of the core shaft is provided with an insulating contact and a moving contact piece, the other end of the core shaft is fixedly connected with a guide cylinder, the surface of the guide cylinder is provided with a positioning step, and the positioning step is arranged on the surface of the guide cylinder. The guide cylinder is sleeved with the limiting sleeve, the guide cylinder is further in threaded connection with the first nut, the limiting base is clamped between the first nut and the positioning step, a first limiting groove and a second limiting groove are formed in the inner wall face of the limiting sleeve, a guide hole is formed in the guide cylinder, a transfer hole is further formed in the surface of the guide cylinder, the feeler lever is sleeved with the guide hole, and a locking groove is further formed in the surface of the feeler lever. The transposition ball is contained in the first limiting groove, the second limiting groove, the transfer hole or the locking groove. By adopting the technical scheme provided by the invention, the error response of the travel switch caused by external force is avoided, the circuit operation state can be switched according to a pre-plan, and the safe operation of electrical equipment is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of electric connectors, and in particular relates to a pull-out type electric travel switch. Background Art

[0002] A switch is a control electrical component that switches the operating state of a circuit. Common switches generally include a touch component and several static components that remain stationary. When external force is applied to the touch component, the touch component moves between the corresponding static components, switching the operating state of the circuit. A travel switch is also a switch electrical component. When pressure is applied to the touch component of the travel switch, the travel switch is triggered. A pull-out travel switch is also a travel switch. It is triggered by applying a pulling force to its touch component, completing the switching of the circuit operating state.

[0003] For example, the patent document with the publication number "CN221466459U" discloses a travel switch that can prevent misoperation and belongs to the field of travel switch technology. The invention comprises an operating box and a drive box fixedly mounted on the right end face of the operating box. Normally open contacts are fixedly mounted on the front and rear sides of the inner cavity of the operating box. An auxiliary contact is slidably mounted in the middle of the inner cavity of the operating box. A return spring is fixedly mounted on the end face of the auxiliary contact. The end of the return spring away from the auxiliary contact is fixedly mounted on the inner cavity side wall of the operating box. A steering mechanism is provided in the inner cavity of the drive box, and an adjustment mechanism is provided above the drive box. This patented technology can control the travel of items on the assembly line on both sides of the travel switch, perform terminal limit protection and metering through the cooperation of the steering mechanism and the auxiliary contacts. The cooperation of the steering mechanism and the steering mechanism realizes the change of the direction of the travel switch, avoids the need to disassemble and install the travel switch, and improves the overall service life of the travel switch.

[0004] However, for most limit switches, the triggering components are usually exposed to the external environment. If people play with the limit switch carelessly, or if external objects exert external squeezing force on the triggering elements of the limit switch during the live transportation of electrical equipment, it is easy for the circuit operation state to fail to switch according to the pre-planned operation, affecting the safe operation of the electrical equipment. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a pull-out type electrical travel switch.

[0006] The present invention provides a pull-out type electrical travel switch, comprising a shell, a pull-out sleeve, a contact rod and a transposition ball, wherein the shell is sleeved on one end of the pull-out sleeve, and the other end of the pull-out sleeve is fixedly connected to a limit seat, and a limit sleeve, a first spring, a static contact assembly and a dynamic contact assembly are provided in the shell, the static contact assembly comprises a static contact piece, and the dynamic contact assembly comprises a core shaft, one end of the core shaft is provided with an insulating contact and a dynamic contact piece, the other end of the core shaft is fixedly connected to a guide cylinder, the surface of the guide cylinder is provided with a positioning step, one end of the guide cylinder is also sleeved in the limit sleeve, and the first spring is clamped between the surface of the guide cylinder and the inner wall surface of the shell, the other end of the guide cylinder is screwed to a first nut, and the limit seat clamp Held between the first nut and the positioning step, the inner wall surface of the limit sleeve is provided with a first limit groove and a second limit groove, the guide cylinder is provided with a guide hole, the surface of the guide cylinder is also provided with a transfer hole, the transfer hole is connected to the guide hole, at least a portion of the contact rod is fitted in the guide hole, the surface of the contact rod is also provided with a locking groove, the transposition ball is accommodated in the first limit groove, the second limit groove, the transfer hole or the locking groove, when external force is applied to the drawing sleeve to move the core shaft and the guide cylinder, when the transposition ball switches between the first limit groove and the second limit groove via the transfer hole and the locking groove, at least one end of the static contact piece slides and switches between the surface of the insulating contact and the surface of the moving contact piece.

[0007] The static contact assembly further includes a terminal and a supporting piece, wherein the static contact piece is fixedly connected to one end of the supporting piece, the other end of the supporting piece is riveted to one end of the terminal, and the other end of the terminal extends out of the housing.

[0008] The static contact assembly further includes a base, a positioning plate and an insulating bushing. The base covers the open end of the shell and is fixedly connected to the positioning plate. The insulating bushing is clamped between the base and the positioning plate. The terminal passes through the insulating bushing.

[0009] The pull-out type electrical travel switch further comprises a retaining ring, which covers and is fixedly connected to the edge of the opening end of the shell, and the retaining ring is tightly connected to the base.

[0010] There are multiple movable contact pieces, and the multiple movable contact pieces are evenly distributed in an array along the outer circumferential surface of the core shaft, and some of the movable contact pieces are also fixedly connected to the first contact piece seat, and another part of the movable contact pieces are also fixedly connected to the second contact piece seat. The movable contact assembly also includes a first spacer and a second spacer. The core shaft is also threaded with a second nut, and the second nut clamps the insulating contact, the first contact piece seat, the first spacer, the second contact piece seat and the second spacer in sequence along the axial direction of the core shaft between the guide cylinder and the second nut.

[0011] The pull-out type electrical limit switch also includes a locking assembly, which includes a locking pin, a button, a second spring and a third spring. The surface of the shell is also provided with a first recessed groove, and the locking pin is supported in the first recessed groove by the second spring. The surface of the pulling sleeve is also provided with a second recessed groove, and a locking hole is also provided in the second recessed groove. The button is supported in the second recessed groove by the third spring. When the transposition ball switches between the first limit groove and the second limit groove via the transfer hole and the locking groove, the locking hole and the first recessed groove switch accordingly between the connected state and the blocked state.

[0012] The pull-out type electrical limit switch also includes a pressure plate, and the button includes a button seat and a boss. The pressure plate is fixedly connected to the edge of the slot of the second recess, and the button seat and the third spring are clamped between the pressure plate and the bottom surface of the second recess. The boss extends out of the pull-out sleeve through the pressure plate.

[0013] A handle is also provided on the surface of the pulling sleeve.

[0014] The pull-out type electrical travel switch further comprises a handle cap and a fourth spring. The handle cap is screwed to the contact rod. The fourth spring is clamped between the first nut and the handle cap. At least a portion of the handle cap is also sleeved in the pull-out sleeve.

[0015] The pull-out type electrical travel switch further comprises a sealing ring which is clamped between the contact rod and the inner wall surface of the guide hole and between the guide cylinder and the inner wall surface of the housing.

[0016] The beneficial effects of the present invention are as follows: by adopting the technical solution provided by the present invention, initially, the static contact piece contacts the insulating contact, and the corresponding circuit remains in an off state. Since the transposition ball is squeezed into the first limiting groove and the transfer hole, even if an external force is applied to the drawing sleeve, since the transposition ball blocks the relative movement between the guide cylinder and the limiting sleeve, the external force cannot cause the drawing sleeve to move, and the travel switch cannot be triggered to respond, thereby preventing the external force from causing the travel switch to respond incorrectly; when it is necessary to make the travel switch switch switch the circuit state, it is necessary to first apply an external force to the contact rod, and the external force causes the contact rod to slide along the axis of the guide hole. When the transfer hole is connected to the locking groove, the transposition ball rolls into between the transfer hole and the locking groove. At this time, The operator then applies external force to the drawing sleeve, and relative movement occurs between the guide cylinder, the touch rod and the limit sleeve. When the transfer hole is connected to the second limit groove, the transposition ball enters between the second limit groove and the transfer hole, the drawing sleeve cannot continue to be pulled, and the static contact piece contacts the moving contact piece, and the circuit is switched to an electrically conductive state. When the pressure applied to the touch rod is removed, the first spring pushes the touch rod to reset, and the external force cannot move the drawing sleeve and cannot trigger the travel switch to respond, thereby preventing the external force from causing the travel switch to respond incorrectly. The present invention avoids external force from causing the travel switch to respond incorrectly by arranging a touch rod structure, so that the circuit operation state can be switched according to the pre-planned operation, thereby ensuring the safe operation of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention;

[0018] Figure 2 This is a front view of the limit sleeve of the present invention;

[0019] Figure 3 is an exploded view of the static contact assembly of the present invention;

[0020] Figure 4 is an exploded view of the dynamic touch assembly of the present invention;

[0021] Figure 5 This is the front view of the present invention after removing the drawing sleeve, the static contact assembly and the locking assembly;

[0022] Figure 6 is an exploded view of the locking assembly of the present invention;

[0023] Figure 7 This invention Figure 1 A partial enlarged view of point Ⅰ in the middle.

[0024] In the figure: 1-housing, 2-pull sleeve, 3-touch rod, 4-transposition ball, 5-limit seat, 6-limit sleeve, 7-first spring, 8-static contact assembly, 9-moving contact assembly, 10-static contact piece, 11-core shaft, 12-insulating contact, 13-moving contact piece, 14-guide cylinder, 15-positioning step, 16-first nut, 17-first limiting groove, 18-second limiting groove, 19-guide hole, 20-transfer hole, 21-locking groove, 22-terminal, 23-base, 24-positioning plate, 2 5-support, 26-insulating bushing, 27-retaining ring, 28-first contact seat, 29-second contact seat, 30-first spacer, 31-second spacer, 32-second nut, 33-locking assembly, 34-locking pin, 35-button, 36-second spring, 37-third spring, 38-pressure plate, 39-button seat, 40-boss, 41-first sink groove, 42-second sink groove, 43-handle, 44-handle cap, 45-fourth spring, 46-sealing ring, 47-locking hole. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described below with reference to the accompanying drawings, but the scope of protection claimed is not limited to the above;

[0026] The present invention provides a pull-out type electrical travel switch, such as Figures 1 to 7As shown, it includes a shell 1, a drawing sleeve 2, a contact rod 3 and a transposition ball 4. The shell 1 is sleeved on one end of the drawing sleeve 2, and the other end of the drawing sleeve 2 is fixedly connected to the limit seat 5. A limit sleeve 6, a first spring 7, a static contact component 8 and a dynamic contact component 9 are provided in the shell 1. The static contact component 8 includes a static contact piece 10, and the dynamic contact component 9 includes a core shaft 11. One end of the core shaft 11 is provided with an insulating contact 12 and a dynamic contact piece 13. The other end of the core shaft 11 is fixedly connected to the guide cylinder 14. The surface of the guide cylinder 14 is provided with a positioning step 15. One end of the guide cylinder 14 is also sleeved in the limit sleeve 6, and the first spring 7 is clamped between the surface of the guide cylinder 14 and the inner wall surface of the shell 1. The other end of the guide cylinder 14 is screwed with the first nut 16, and the limit seat 5 is clamped between the first nut 16 and the positioning step 15. Between the steps 15, the inner wall surface of the limit sleeve 6 is provided with a first limit groove 17 and a second limit groove 18, a guide hole 19 is provided in the guide cylinder 14, and a transfer hole 20 is further provided on the surface of the guide cylinder 14, which is communicated with the guide hole 19. At least a portion of the contact rod 3 is fitted into the guide hole 19, and a locking groove 21 is further provided on the surface of the contact rod 3. The transposition ball 4 is accommodated in the first limit groove 17, the second limit groove 18, the transfer hole 20 or the locking groove 21. When external force is applied to the drawing sleeve 2 to move the core shaft 11 and the guide cylinder 14, when the transposition ball 4 switches between the first limit groove 17 and the second limit groove 18 via the transfer hole 20 and the locking groove 21, at least one end of the static contact piece 10 slides and switches between the surface of the insulating contact 12 and the surface of the moving contact piece 13.

[0027] By adopting the technical solution provided by the present invention, initially, the static contact piece contacts the insulating contact, and the corresponding circuit remains in an off state. Since the transposition ball is squeezed in the first limit groove and the transfer hole, even if an external force is applied to the drawing sleeve, since the transposition ball blocks the relative movement between the guide cylinder and the limit sleeve, the external force cannot cause the drawing sleeve to move, and the travel switch cannot be triggered to respond, thereby preventing the external force from causing the travel switch to respond incorrectly; when it is necessary to make the travel switch switch to switch the circuit state, it is necessary to first apply an external force to the contact rod, and the external force causes the contact rod to slide along the axis of the guide hole. When the transfer hole is connected to the locking groove, the transposition ball rolls between the transfer hole and the locking groove. At this time, the operator applies the pull External force is applied to the pulling sleeve, and relative movement is generated between the guide cylinder, the touch rod and the limit sleeve. When the transfer hole is connected to the second limit groove, the transposition ball enters between the second limit groove and the transfer hole, and the pulling sleeve cannot be pulled any further, while the static contact piece contacts the moving contact piece, and the circuit is switched to an electrically conductive state. When the pressure applied to the touch rod is removed, the first spring pushes the touch rod to reset, and the external force cannot move the pulling sleeve and trigger the travel switch to respond, thereby preventing the external force from causing the travel switch to respond incorrectly. The present invention avoids external force from causing the travel switch to respond incorrectly by arranging a touch rod structure, so that the circuit operation state can be switched according to the pre-planned operation, thereby ensuring the safe operation of the electrical equipment.

[0028] Specifically, there are multiple static contact pieces 10, which are evenly distributed in an array along the outer circumference of the core shaft 11. The static contact assembly 8 also includes a terminal 22 and a support piece 25. The static contact piece 10 is fixedly connected to one end of the support piece 25, and the other end of the support piece 25 is riveted to one end of the terminal 22. The other end of the terminal 22 extends outside the housing 1.

[0029] In addition, the static contact assembly 8 also includes a base 23, a positioning plate 24, and an insulating bushing 26. The base 23 covers the open end of the housing 1 and is fixedly connected to the positioning plate 24. The insulating bushing 26 is clamped between the base 23 and the positioning plate 24, and the terminal 22 passes through the insulating bushing 26. The pull-out electrical limit switch also includes a retaining ring 27, which covers and is fixedly connected to the edge of the open end of the housing 1 and is tightly connected to the base 23.

[0030] Furthermore, there are multiple movable contact pieces 13, evenly distributed along the outer circumference of the core shaft 11. Some of the movable contact pieces 13 are fixedly connected to the first contact piece seat 28, while others are fixedly connected to the second contact piece seat 29. The movable contact assembly 9 also includes a first spacer 30 and a second spacer 31. The core shaft 11 is also threadedly connected to a second nut 32. The second nut 32 sequentially clamps the insulating contact 12, the first contact piece seat 28, the first spacer 30, the second contact piece seat 29, and the second spacer 31 between the guide cylinder 14 and the second nut 32 along the axial direction of the core shaft 11. Preferably, there are eight static contacts 10 and eight movable contact pieces 13, but four movable contact pieces 13 are isolated from the other four by the first spacer 30, thereby reducing the volume of the travel switch structure and improving space utilization efficiency.

[0031] Specifically, the pull-out electrical travel switch also includes a locking assembly 33, which includes a locking pin 34, a button 35, a second spring 36, and a third spring 37. The surface of the housing 1 is also provided with a first recessed groove 41, and the locking pin 34 is supported in the first recessed groove 41 by the second spring 36. The surface of the pull-out sleeve 2 is also provided with a second recessed groove 42, and the second recessed groove 42 is further provided with a locking hole 47. The button 35 is supported in the second recessed groove 42 by the third spring 37. When the transposition ball 4 switches between the first limiting groove 17 and the second limiting groove 18 via the transfer hole 20 and the locking groove 21, the locking hole 47 and the first recessed groove 41 switch between the connected state and the blocked state accordingly. Preferably, there are multiple locking assemblies 33, and the multiple locking assemblies 33 are evenly distributed in an array along the outer circumference of the housing 1 or the pull-out sleeve 2. By adopting the technical solution of the present invention, after completing the switching of the circuit operation state, the button 35 can be pressed to allow the locking pin 34 to extend into the second sink groove 42 through the locking hole 47, thereby further locking the limit switch state and further preventing the limit switch from being triggered by external force.

[0032] In addition, the pull-out type electrical limit switch further includes a pressure plate 38, and the button 35 includes a button seat 39 and a boss 40. The pressure plate 38 is fixedly connected to the edge of the notch of the second recess 42, and the button seat 39 and the third spring 37 are clamped between the pressure plate 38 and the bottom surface of the second recess 42. The boss 40 extends out of the pull-out sleeve 2 through the pressure plate 38. Preferably, a handle 43 is also provided on the surface of the pull-out sleeve 2.

[0033] Specifically, the pull-out electrical limit switch further includes a handle cap 44 and a fourth spring 45. The handle cap 44 is threadedly connected to the contact rod 3. The fourth spring 45 is clamped between the first nut 16 and the handle cap 44. At least a portion of the handle cap 44 is also sleeved within the pull-out sleeve 2. The pull-out electrical limit switch further includes a sealing ring 46, which is clamped between the contact rod 3 and the inner wall of the guide hole 19, and between the guide cylinder 14 and the inner wall of the housing 1.

Claims

1. A pull-out electrical travel switch, characterized in that: The invention comprises a shell (1), a drawing sleeve (2), a contact rod (3) and a transposition ball (4); the shell (1) is fitted on one end of the drawing sleeve (2); the other end of the drawing sleeve (2) is fixedly connected to a limit seat (5); a limit sleeve (6), a first spring (7), a static contact assembly (8) and a dynamic contact assembly (9) are provided in the shell (1); the static contact assembly (8) comprises a static contact piece (10); the dynamic contact assembly (9) comprises a core shaft (11); one end of the core shaft (11) is provided with an insulating contact ( 12) and a moving contact piece (13), the other end of the core shaft (11) is fixedly connected to the guide cylinder (14), the surface of the guide cylinder (14) is provided with a positioning step (15), one end of the guide cylinder (14) is also sleeved in the limiting sleeve (6), and the first spring (7) is clamped between the surface of the guide cylinder (14) and the inner wall surface of the housing (1), the other end of the guide cylinder (14) is screwed to the first nut (16), and the limiting seat (5) is clamped between the first nut (16) and the positioning sleeve (6). Between the levels (15), the inner wall surface of the limiting sleeve (6) is provided with a first limiting groove (17) and a second limiting groove (18), the guide cylinder (14) is provided with a guide hole (19), the surface of the guide cylinder (14) is also provided with a transfer hole (20), the transfer hole (20) is communicated with the guide hole (19), at least a part of the touch rod (3) is sleeved in the guide hole (19), the surface of the touch rod (3) is also provided with a locking groove (21), the transposition ball (4) is accommodated in the first limiting When an external force is applied to the drawing sleeve (2) to move the core shaft (11) and the guide cylinder (14), the switching ball (4) switches between the first limiting groove (17) and the second limiting groove (18) via the switching hole (20) and the locking groove (21), at least one end of the static contact piece (10) slides and switches between the surface of the insulating contact (12) and the surface of the moving contact piece (13).

2. A pull-out type electrical travel switch according to claim 1, characterized in that: The static contact assembly (8) further comprises a terminal (22) and a supporting piece (25), wherein the static contact piece (10) is fixedly connected to one end of the supporting piece (25), the other end of the supporting piece (25) is riveted to one end of the terminal (22), and the other end of the terminal (22) extends outside the housing (1).

3. A pull-out type electrical travel switch according to claim 2, characterized in that: The static contact assembly (8) further includes a base (23), a positioning disk (24) and an insulating bushing (26); the base (23) covers the open end of the housing (1), and the base (23) and the positioning disk (24) are fixedly connected; the insulating bushing (26) is clamped between the base (23) and the positioning disk (24); and the terminal (22) passes through the insulating bushing (26).

4. A pull-out type electrical travel switch according to claim 3, characterized in that: The pull-out type electrical travel switch further comprises a retaining ring (27), which covers and is fixedly connected to the edge of the opening end of the housing (1), and the retaining ring (27) is tightly connected to the base (23).

5. A pull-out type electrical travel switch according to claim 1, characterized in that: The number of the movable contact pieces (13) is multiple, and the multiple movable contact pieces (13) are evenly distributed in an array along the outer peripheral surface of the core shaft (11), and a part of the movable contact pieces (13) are also fixedly connected to the first contact piece seat (28), and another part of the movable contact pieces (13) are also fixedly connected to the second contact piece seat (29). The movable contact assembly (9) also includes a first spacer (30) and a second spacer (31). The core shaft (11) is also screwed with a second nut (32). The second nut (32) clamps the insulating contact (12), the first contact piece seat (28), the first spacer (30), the second contact piece seat (29) and the second spacer (31) in sequence along the axial direction of the core shaft (11) between the guide cylinder (14) and the second nut (32).

6. A pull-out type electrical travel switch according to claim 1, characterized in that: The pull-out type electrical travel switch further comprises a locking assembly (33), the locking assembly (33) comprising a locking pin (34), a button (35), a second spring (36) and a third spring (37); a first recessed groove (41) is further provided on the surface of the housing (1); the locking pin (34) is supported in the first recessed groove (41) by the second spring (36); a second recessed groove (42) is further provided on the surface of the pull-out sleeve (2); a locking hole (47) is further provided in the second recessed groove (42); the button (35) is supported in the second recessed groove (42) by the third spring (37); when the transposition ball (4) switches between the first limiting groove (17) and the second limiting groove (18) via the transfer hole (20) and the locking groove (21), the locking hole (47) and the first recessed groove (41) are correspondingly switched between a connected state and a blocked state.

7. A pull-out type electrical travel switch according to claim 6, characterized in that: The pull-out type electrical travel switch also includes a pressure plate (38), and the button (35) includes a button seat (39) and a boss (40). The pressure plate (38) is fixedly connected to the edge of the notch of the second recess (42), and the button seat (39) and the third spring (37) are clamped between the pressure plate (38) and the bottom surface of the second recess (42). The boss (40) extends out of the pull-out sleeve (2) through the pressure plate (38).

8. A pull-out type electrical travel switch according to claim 1, 6 or 7, characterized in that: A handle (43) is also provided on the surface of the pulling sleeve (2).

9. The pull-out type electrical travel switch according to claim 1, characterized in that: The pull-out type electrical travel switch further comprises a handle cap (44) and a fourth spring (45), wherein the handle cap (44) is screwed to the contact rod (3), the fourth spring (45) is clamped between the first nut (16) and the handle cap (44), and at least a portion of the handle cap (44) is also sleeved in the pull-out sleeve (2).

10. The pull-out type electrical travel switch according to claim 1, characterized in that: The pull-out type electrical travel switch further comprises a sealing ring (46), which is clamped between the contact rod (3) and the inner wall surface of the guide hole (19), and between the guide cylinder (14) and the inner wall surface of the housing (1).

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