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CN-224228604-U - Portable pit digger with safety switch

CN224228604UCN 224228604 UCN224228604 UCN 224228604UCN-224228604-U

Abstract

The utility model discloses a portable pit digger with a safety switch, and belongs to the technical field of garden machinery. The pit digger comprises an engine, a frame, a gear box, a drill bit and an overload protection device, wherein the overload protection device is installed on the frame through a body, a rotating shaft on the body is connected with an operating soft rod and an eccentric wheel, a torsion spring is sleeved on the rotating shaft, and an accelerator cable bypasses the eccentric wheel to be connected with the engine. When the drill bit touches a hard object to stop rotating, the soft rod is operated to drive the rotating shaft and the eccentric wheel to rotate, so that the accelerator cable is loosened, the rotating speed of the engine is reduced, and overload protection is realized. The utility model adopts the eccentric wheel mechanism, has simple structure, is waterproof and dustproof, is safe and reliable, and effectively solves the problem that the arm of an operator is sprained due to continuous operation of the engine when the drill bit is blocked in the prior art.

Inventors

  • WANG JINJIE

Assignees

  • 临沂乘风园林机械有限公司

Dates

Publication Date
20260512
Application Date
20250703

Claims (5)

  1. 1. The portable pit digger with the safety switch comprises an engine (1), a frame (2), a gear box (3) and a drill bit (4), wherein an accelerator switch (21) is arranged on the frame (2), the accelerator switch (21) is connected with an accelerator cable (6), and the portable pit digger is characterized by further comprising an overload protection device (5), the overload protection device (5) comprises a body (51), a rotating shaft (52) is arranged on the body (51), the lower part of the rotating shaft (52) is connected with an operating soft rod (53), an eccentric wheel (54) is arranged on the upper part of the rotating shaft, a torsion spring (55) is sleeved on the rotating shaft (52), a protective cover (56) is arranged on the upper part of the body (51), and the accelerator cable (6) bypasses the eccentric wheel (54) and is connected with the engine (1).
  2. 2. The portable pit excavator with the safety switch according to claim 1, wherein the center of the eccentric wheel (54) is eccentrically arranged with the axis of the rotating shaft (52).
  3. 3. A portable pit excavator with a safety switch according to claim 1, wherein one end of the torsion spring (55) is fixed to the body (51) and the other end is fixed to the rotary shaft (52).
  4. 4. A portable pit excavator with a safety switch according to claim 1 wherein the guard cover (56) is secured to the upper part of the body (51) by screws.
  5. 5. A portable pit excavator with a safety switch according to claim 1 wherein the end of the stick (53) is oriented towards the operator's hand position.

Description

Portable pit digger with safety switch Technical Field The utility model relates to the technical field of garden machinery, in particular to a portable pit digger with a safety switch, which is particularly suitable for garden operation equipment needing safety protection, such as a ground drill, an ice drill, a portable pit digger, an earth boring machine and the like. Background In the field of garden machinery, portable earth boring machines are commonly used working tools, mainly for operations such as digging pits, drilling holes, etc. The prior art hand-held earth boring machines have the obvious disadvantage that when the drill bit hits hard objects (e.g. stones, tree roots) the drill bit is forced to stop rotating, but the upper motor remains in operation. At this time, the power of the engine can not be output through the drill bit, larger reaction force can be generated, the arm of an operator is easy to be sprained, and potential safety hazards exist. Similar safety protection techniques exist in the market at present, such as the use of electronic switches as safety protection devices in CN216218663U patent. However, the scheme has obvious defects that the electronic switch is complex in structure and high in manufacturing cost, electronic elements are easily affected by rainwater, dust and other factors to cause faults or sensitivity reduction in an outdoor operation environment, and the reliability of the electronic switch is low, so that the electronic switch cannot respond timely at key time, and the safety of operators cannot be effectively guaranteed. Therefore, there is a need for a safety device that is simple in structure, safe and reliable, and that is adaptable to outdoor operating environments. Disclosure of utility model The utility model aims to provide a portable pit digger with a safety switch, which realizes overload protection through a mechanical structure, solves the safety problem caused by continuous operation of an engine when a drill bit meets hard objects in the prior art, overcomes the defects of complex structure and low reliability of the traditional electronic switch, and realizes the technical effects of simple structure, water resistance, dust resistance, safety and reliability. The portable pit digger with the safety switch comprises an engine, a frame, a gear box, a drill bit and an overload protection device, wherein a throttle switch is arranged on the frame and is connected with a throttle cable, and the throttle cable is used for controlling the throttle of the engine. Further, the overload protection device comprises a body, a rotating shaft is arranged on the body, the lower part of the rotating shaft is connected with an operating soft rod, the upper part of the rotating shaft is provided with an eccentric wheel, and a torsion spring is sleeved on the rotating shaft. The upper part of the body is provided with a protective cover, and the throttle cable bypasses the eccentric wheel and is connected with the engine. When the drill bit rotates normally, the control soft rod is kept at a normal position under the torsion action of the torsion spring, the eccentric wheel is at a specific angle, and the accelerator cable is wound at the highest point of the eccentric wheel, so that the accelerator cable is kept in a tensioning state. The tensioning state of the accelerator cable ensures that the accelerator switch is positioned at the accelerator-adding position, the engine keeps running at normal rotation speed, and the drill bit works normally. And in overload protection state, when the drill bit touches a hard object to stop rotating, the engine still continues to operate, and at the moment, the resistance force applied by the drill bit is transmitted through the transmission system to drive the control soft rod to contact with the body of an operator (or displace after the resistance force is applied). The displacement of the control soft rod drives the rotating shaft to rotate, and the rotating shaft drives the eccentric wheel to synchronously rotate. After the eccentric wheel rotates, the accelerator cable is transferred from the highest point of the eccentric wheel to the low point, so that the accelerator cable is changed from a tensioning state to a loosening state. The relaxation of the accelerator cable causes the accelerator switch to reset, and reduces the oil supply quantity of the engine, so that the rotating speed of the engine is rapidly reduced, and the reaction force generated by continuous high-rotating-speed operation of the engine is avoided from spraining the arms of operators. When the hard object is removed, the torsion of the torsion spring enables the control soft rod and the eccentric wheel to reset, the accelerator cable is tensioned again, and the engine returns to the normal rotation speed. Compared with the prior art, the utility model has the beneficial effects that: The structure is simple and reliable, an eccentric wheel turbi