Electric hammer sensor
By designing the electric hammer sensor, using the elastomer, strain gauge and Wheatstone bridge structure, the precise torque perception of foreign objects is achieved, which solves the problem that the electric hammer drill bit cannot sense foreign objects, improves the accuracy and transmission stability of the sensor, and extends the service life of the drill bit.
Patent Information
- Application Number
- CN202422147199.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-03
AI Technical Summary
Existing electric hammer drill bits cannot sense foreign objects in the wall, causing the drill bit to wear or break, affecting the installation quality.
Design a hammer sensor, including an elastomer, a strain gauge, a flexible PCB and cable, adopts a Wheatstone bridge structure, connected to the rotor and tool through gears and external hexagonal structures, achieving precise torque sensing.
Improve the accuracy and consistency of the sensor, ensure smooth transmission, extend the service life of the drill bit, and avoid damage caused by foreign objects collision.
Smart Images
Figure CN223131049U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sensors, and particularly relates to a hammer drill sensor. Background Art
[0002] With the increasing requirements for installation in the construction industry, higher requirements are imposed on the supporting installation power tools. When drilling holes in building walls, it is possible to encounter foreign objects such as steel bars and fittings embedded in the wall. The hammer drill bit cannot sense the existence of these foreign objects, and the drill bit will be severely worn or even broken. Sometimes, it will damage the holes drilled in the wall, thus affecting the installation.
[0003] Therefore, there is an urgent need to propose a hammer drill sensor. Summary of the Utility Model
[0004] To solve the defects existing in the prior art, the utility model provides a hammer drill sensor.
[0005] To solve the above technical problems, the utility model provides the following technical solutions:
[0006] The utility model provides a hammer drill sensor, which includes an elastic body, 8 strain gauges, a flexible PCB, and a cable. The elastic body is of a cylindrical structure. One axial end of the elastic body is provided with an external gear structure, and the other axial end of the elastic body is provided with an external hexagon structure. The 8 strain gauges are uniformly arranged on the outer surface of the elastic body along the circumferential direction of the elastic body. The flexible PCB is arranged on the outer surface of the elastic body, and its input end is electrically connected to the 8 strain gauges to form a Wheatstone bridge. The cable is electrically connected to the output end of the flexible PCB.
[0007] Preferably, a silica gel protective sleeve is sleeved on the elastic body and is located outside the flexible PCB.
[0008] Preferably, the part of the elastic body between the external gear structure and the external hexagon structure is a strain shaft, and the outer diameter dimension of the external gear structure is larger than the outer diameter dimension of the strain shaft.
[0009] Preferably, a boss is provided on the elastic body outside the external gear structure. The outer diameter dimension of the boss is smaller than the outer diameter dimension of the external gear structure and larger than the outer diameter dimension of the strain shaft.
[0010] Compared with the prior art, the utility model has the following beneficial effects:
[0011] (1) One end of the sensor of the utility model is mechanically connected to the rotor through a gear structure, and the other end is cooperatively connected to the internal hexagon of the tool through an external hexagon structure, with stable and efficient transmission and a compact structure.
[0012] (2) In the present utility model, eight strain gauges are evenly arranged along the circumferential direction of the elastic body and form a Wheatstone bridge, resulting in high sensor accuracy and good consistency.
[0013] (3) In the present utility model, the sensor adopts a boss design axially, effectively ensuring axial positioning.
[0014] (4) The present utility model is sealed with a silicone protective sleeve, which is beautiful and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic exploded view of a hammer drill sensor of the present utility model;
[0016] Figure 2 is a schematic overall structure view of a hammer drill sensor of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The following describes the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not used to limit the present utility model.
[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings of the specification. Figure 1 It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0019] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, 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 directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0020] As Figures 1 to 2 shown, this embodiment provides a hammer drill sensor, which includes an elastic body 1, eight strain gauges 2, a flexible PCB 3, and a cable 4. The elastic body 1 is a cylindrical structure. One axial end of the elastic body 1 is provided with an external gear structure, and the other axial end of the elastic body 1 is provided with an external hexagon structure. The eight strain gauges 2 are evenly arranged along the circumferential direction of the elastic body 1 on the outer surface of the elastic body 1. The flexible PCB 3 is arranged on the outer surface of the elastic body 1, and its input end is electrically connected to the eight strain gauges 2 to form a Wheatstone bridge. The cable 4 is electrically connected to the output end of the flexible PCB 3. The elastic body 1 is made of stainless steel material, improving the service life of the sensor.
[0021] Specifically, a silica gel protective sleeve 5 is further provided, and the silica gel protective sleeve 5 is sleeved on the elastomer 1 and located outside the flexible PCB 3.
[0022] Specifically, the strain axis is located between the external gear structure and the external hexagonal structure on the elastomer 1, and the outer diameter dimension of the external gear structure is larger than the outer diameter dimension of the strain axis.
[0023] A boss is provided on the elastomer 1 and located outside the external gear structure. The outer diameter dimension of the boss is smaller than the outer diameter dimension of the external gear structure and larger than the outer diameter dimension of the strain axis.
[0024] The working principle of this embodiment will be further described below:
[0025] The sensor is mechanically connected to the motor rotor through the external gear structure. The torque on the rotor is converted into an analog signal through the mechanical deformation of the sensor, and the signal is amplified through the circuit board to real-time feedback the torque on the rotor. The transmission is stable and efficient, and the structure is compact. Eight strain gauges are evenly arranged along the circumferential direction of the elastomer and form a Wheatstone bridge, making the sensor have high precision and good consistency. The axial direction of the sensor adopts a boss design, effectively ensuring the axial positioning.
[0026] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An electric hammer sensor, characterized in that, It includes an elastomer (1), eight strain gauges (2), a flexible PCB (3), and a cable (4). The elastomer (1) is of a cylindrical structure. An external gear structure is provided at one axial end of the elastomer (1), and an external hexagonal structure is provided at the other axial end of the elastomer (1). The eight strain gauges (2) are uniformly arranged on the outer surface of the elastomer (1) along the circumferential direction of the elastomer (1). The flexible PCB (3) is arranged on the outer surface of the elastomer (1), and its input end is electrically connected to the eight strain gauges (2) to form a Wheatstone bridge. The cable (4) is electrically connected to the output end of the flexible PCB (3).
2. The electric hammer sensor according to claim 1, characterized in that, A silicone protective sleeve (5) is further provided. The silicone protective sleeve (5) is sleeved on the elastomer (1) and is located outside the flexible PCB (3).
3. The electric hammer sensor according to claim 1, characterized in that, The part of the elastomer (1) between the external gear structure and the external hexagonal structure is the strain axis, and the outer diameter dimension of the external gear structure is larger than that of the strain axis.
4. The electric hammer sensor according to claim 3, wherein A boss is provided on the elastomer (1) and is located outside the external gear structure. The outer diameter dimension of the boss is smaller than that of the external gear structure and larger than that of the strain axis.