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CN-224204014-U - Speed-regulating rotary switch

CN224204014UCN 224204014 UCN224204014 UCN 224204014UCN-224204014-U

Abstract

The utility model discloses a speed governing rotary switch, including the support, speed governing knob and fixed PCB board that sets up between speed governing knob and support, be provided with the pivot hole on the support, speed governing knob is equipped with and rotates the knob pivot of connecting in the pivot hole, through being equipped with elasticity spacing knot in knob pivot one end, correspond in the pivot downthehole be equipped with spacing knot complex spacing block, adopt this technical scheme, when installing speed governing knob, in the pivot hole with knob pivot lug insert the support, support and form automatic locking on spacing block through spacing knot elasticity block, realize quick assembly's purpose, and utilize spacing cooperation between spacing knot and the spacing card to be used for blockking the knob pivot and break away from the pivot hole along the axial, installation stability is good, promote rotatory smoothness, the mounting structure of this kind of speed governing knob is simple, reduce the installation spare part, realize exempting from the instrument installation, promote installation effectiveness, reduction in production cost.

Inventors

  • Hu Xinwang
  • LI XIANNAN
  • QU HAILIANG
  • LIN CHAOWEI

Assignees

  • 浙江中讯电子有限公司

Dates

Publication Date
20260505
Application Date
20250418

Claims (10)

  1. 1. The speed regulation rotary switch comprises a support (1) and a speed regulation knob (2) which is rotatably arranged on the support (1), and a PCB (3) which is fixedly arranged between the speed regulation knob (2) and the support (1), and is characterized in that a rotating shaft hole (11) is formed in the support (1), the speed regulation knob (2) is provided with a knob rotating shaft (21) which is rotatably connected in the rotating shaft hole (11), a limiting structure which is used for limiting the knob rotating shaft (21) to move along the axial direction and separate from the rotating shaft hole (11) is arranged between the knob rotating shaft (21) and the rotating shaft hole (11), and the limiting structure comprises a limiting clamping table (4) which is arranged in the rotating shaft hole (11), and a group of limiting buckles (5) which are arranged at one end of the knob rotating shaft (21) and elastically abutted to form limiting fit on the limiting clamping table (4).
  2. 2. The speed regulating rotary switch according to claim 1, wherein the speed regulating knob (2) comprises a knob baffle (22) in a circular shape and a handle portion (23) connected to the outer peripheral side of the knob baffle (22), and the knob rotating shaft (21) is a hollow rotating shaft integrally formed on the inner side of the knob baffle (22).
  3. 3. The speed regulating rotary switch according to claim 2, wherein the limiting buckle (5) comprises two elastic buckles which are arranged at one end of the knob rotating shaft (21) along the axial direction of the knob rotating shaft (21).
  4. 4. A speed regulating rotary switch according to claim 3, wherein the limit clamping table (4) is an annular clamping table formed on the inner wall of the rotating shaft hole (11).
  5. 5. The speed regulating rotary switch of claim 3, wherein the end of the elastic buckle is provided with a guiding circular arc inclined plane.
  6. 6. The speed regulation rotary switch according to claim 2, wherein a plurality of gear grooves (24) are formed in the inner side of the handle part (23) at intervals, a mounting groove with an opening facing the handle part (23) is formed in the top of the bracket (1), a pressure spring (61) and a steel sleeve (62) which are connected are arranged in the mounting groove, a concave hole which is suitable for accommodating the pressure spring (61) is formed in the lower end of the steel sleeve (62), and the upper end of the steel sleeve extends out of the mounting groove and contacts with a round shaft end in the gear groove (24).
  7. 7. A speed regulating rotary switch according to any one of claims 2 to 6 wherein: the rotary knob assembly is characterized by further comprising an elastic movable contact piece (7) which is positioned and installed on the knob baffle (22) through a connecting structure, wherein a contact assembly which is matched and contacted with the elastic contact piece is arranged on the PCB (3), and the elastic movable contact piece (7) is connected with a speed regulation electric loop on the PCB (3) when being in coupling contact with the contact assembly.
  8. 8. The speed regulating rotary switch according to claim 7, wherein the elastic movable contact piece (7) comprises two V-shaped contact parts (71) extending towards one side of the PCB (3), the contact assembly comprises a first contact part (31) extending along the movement track of the elastic movable contact piece (7) and arranged on the PCB (3), and a plurality of second contact parts (32) sequentially arranged on the PCB (3) at intervals along the movement track of the elastic movable contact piece (7) and distributed on one side of the first contact part (31), one V-shaped contact part (71) is always in sliding contact with the first contact part (31), and the other V-shaped contact part (71) is in sliding switching between the plurality of second contact parts (32).
  9. 9. The speed regulation rotary switch according to claim 8, wherein the connecting structure comprises a positioning groove (8) arranged on the knob baffle (22) and used for installing the elastic movable contact piece (7), and a positioning boss (9) arranged in the positioning groove (8) in a extending manner along the length direction of the positioning groove (8), the elastic movable contact piece (7) comprises two connecting pieces (72) connected at two ends of the two V-shaped contact parts (71) and a connecting groove (73) formed between the two V-shaped contact parts (71), and the positioning boss penetrates into the connecting groove (73) when the elastic movable contact piece (7) is installed in the positioning groove (8), so that the two connecting pieces (72) are respectively elastically abutted at two ends of the positioning boss to form a positioning fit.
  10. 10. The speed regulating rotary switch according to claim 9, wherein a first gap (81) and a second gap (82) with a length being one large and one small are formed between two ends of the positioning boss (9) and two ends of the positioning groove (8), one connecting piece (72) is limited in the first gap (81), the other connecting piece (72) is arranged in the second gap (82) and can move when the elastic movable contact piece (7) is pressed, and a plurality of protruding ribs (83) contacting the bottom of the elastic movable contact piece (7) are arranged in the positioning groove (8) at intervals.

Description

Speed-regulating rotary switch Technical Field The utility model relates to the technical field of electric switches, in particular to a speed-regulating rotary switch. Background The speed regulating switch is widely applied to the fields of hand-held electric tools and household appliances, such as electric drills, eggbeater, electric wrenches, electric screwdrivers and the like, and is an electronic switch which adopts an electronic circuit or a micro-processing chip to control the rotating speed of a motor by changing the number of stages, voltage, current, frequency and the like of the motor so as to enable the motor to achieve higher service performance. The prior art discloses an electronic speed regulating switch as in chinese patent document CN211376505, which comprises a shift assembly and an acceleration assembly arranged on the left side and the right side of a bracket, the shift assembly comprises a PCB board, a speed regulating dial knob and a contact piece arranged in the speed regulating dial knob, the PCB board is fixedly connected on the bracket through a self-tapping screw and the speed regulating dial knob, the speed regulating dial knob rotates by taking the self-tapping screw as an axis, the exposed contact on the PCB board is in coupling contact with the contact piece arranged in the speed regulating dial knob, the contact piece comprises 4 contact terminals, the end part of the contact piece is provided with a mounting hole, and the contact piece is sleeved on a mounting column through the mounting hole, so that the contact piece is displaced simultaneously when the speed regulating dial knob rotates. The electronic speed regulating switch still has the following problems that 1, the speed regulating dial knob is connected to the support through a self-tapping screw and rotates around the self-tapping screw, the mounting structure is complex, the mounting parts are more, the setting cost is high, the abrasion between the speed regulating dial knob and the screw is aggravated when the speed regulating dial knob is frequently rotated and regulated, the regulating hand feeling is unsmooth, the screw is easy to come loose under the working environment of high vibration and load to influence the structural stability, 2, the contact piece is of a traditional electric brush structure, is sleeved on the mounting column through a mounting hole and needs to be subjected to hot riveting fixation, the assembly process is inconvenient, the contact piece is easy to deform in the mounting operation process, and the contact performance is influenced. Disclosure of utility model Therefore, the utility model aims to solve the technical problems that the speed regulating toggle button in the prior art is connected to the bracket through the self-tapping screw and rotates around the self-tapping screw, and the speed regulating rotary switch has the advantages of complex installation structure, high installation cost and poor structural stability, so that the speed regulating rotary switch has the advantages of simple installation structure, high installation efficiency, low production cost and high rotary smoothness of the knob. In order to solve the technical problems, the utility model provides a speed regulation rotary switch, which comprises a bracket, a speed regulation knob and a PCB (printed circuit board) fixedly arranged between the speed regulation knob and the bracket, wherein the bracket is provided with a rotary shaft hole, the speed regulation knob is provided with a knob rotary shaft rotationally connected in the rotary shaft hole, a limiting structure for limiting the knob rotary shaft to axially move away from the rotary shaft hole is arranged between the knob rotary shaft and the rotary shaft hole, and the limiting structure comprises a limiting clamping table arranged in the rotary shaft hole and a group of limiting buckles arranged at one end of the knob rotary shaft and elastically abutted on the limiting clamping table to form limiting fit. In the above speed regulating rotary switch, the speed regulating knob comprises a circular knob baffle and a handle part connected to the outer periphery of the knob baffle, and the knob rotating shaft is a hollow rotating shaft integrally formed on the inner side surface of the knob baffle. In the above speed regulation rotary switch, the limiting buckle comprises two elastic buckles extending along the axial direction of the knob rotating shaft and arranged at one end of the knob rotating shaft. In the speed regulation rotary switch, the limiting clamping table is an annular clamping table formed on the inner wall of the rotating shaft hole. In the speed regulation rotary switch, the end part of the elastic buckle is provided with a guide arc inclined plane. In the speed regulation rotary switch, a plurality of gear grooves are formed in the inner side of the handle part at intervals, an installation groove with an opening facing the handle p