TWI529037B - Electronic torque wrench and its torque measuring device - Google Patents

Description

Electronic torque wrench and twisting force measuring device

The invention relates to a torque wrench, in particular to an electronic torque wrench and a twisting force measuring device thereof.

With the development of electronic components, many hand tools such as wrenches, screwdrivers, and ratchet wrenches are gradually introduced into electronic components that detect torque values and display torque values. For example, Taiwan's I330575, M431047, M360114, M372771, and M394880 No. Patent No. 201204511 and Taiwan No. 201204511 disclose a wrench that can detect the torque value.

Among them, the patent No. M394880 discloses a multifunctional torque tool sensing device, which discloses a structure that can replace the tool head. However, the torque value is equal to the force multiplied by the force arm, but after replacing the different tool heads, the force arm may also change. Therefore, the torque value measured by the patented multifunctional torque tool sensing device after replacing different tool heads. It may also be distorted.

Taiwan Publication No. 201204511 discloses a method for the digital torque wrench structure and the uniform force of the grip thereof, which is to set the sensor and the strain gauge on the trigger portion, which is also a conventional practice. However, since the digital display is located behind the digital torque wrench, the electrical connection between the sensor, the strain gauge and the digital display is difficult in assembly.

In view of the above-mentioned deficiencies, the electronic torque wrench of the present invention can achieve a main purpose, and the main purpose is that the electronic torque wrench can directly obtain the actual torque value applied to the workpiece when subjected to an external force, and is easier to assemble.

In order to achieve the above main purpose, the electronic torque wrench package of the present invention A wrench body, a sensor, a grip and a computing device are included. The wrench body has a connecting rod and a tool head. The connecting rod has two front and rear ports, and the tool head is connected with the connecting rod and protrudes from the front port of the connecting rod. The sensor generates a sensing signal according to the degree of force, and has a fixed section, a strain section and a force section. The fixed section is connected to the connecting rod of the wrench body and is located at the front end of the strain section. The rear end of the strain section protrudes from the rear port of the connecting rod. The force section is at the rear end of the strain section. The grip sleeve is sleeved on the connecting rod of the wrench body and connected to the force receiving section of the sensor. The computing device electrically connects the sensor and receives the sensed signal and processes it into a torque value.

Thereby, the electronic torque wrench of the present invention can obtain the torque actually applied to the workpiece by the sensor and the computing device, and since the sensor arrangement is independent of the tool head, the sensor and the computing device The electrical connection between them is simpler and better assembled than the prior art.

The electronic torque wrench of the present invention can achieve another purpose. Another purpose is that the torque measuring device of the electronic torque wrench can replace the tool head, and the twisting force measuring device can input the actual force arm of the electronic torque wrench to Make the electronic torque wrench get the accurate torque value.

In order to achieve the above other object, the twisting force measuring device of the electronic torque wrench of the present invention comprises a connecting rod, a sensor, a grip and a computing device. The sensor generates a sensing signal according to the degree of force, and has a fixed section, a strain section and a force section. The fixed section is connected to the connecting rod and is located at the front end of the strain section. The rear end of the strain section protrudes out of the connecting rod. The force section is at the rear end of the strain section. The grip sleeve is sleeved on the connecting rod and connected to the force receiving section of the sensor. The computing device electrically connects the sensor and receives the sensed signal and processes it into a torque value.

In this way, when assembling, the twisting force measuring device and the tool head do not need to consider the connecting line to facilitate assembly.

Preferably, the computing device is provided on the connecting rod. The computing device has an arithmetic circuit, a display and an input unit. The arithmetic circuit is connected to the display and the input unit, and the sensing signal is calculated as a torque value, the display is a torque value, and the input unit is used to input a value. In this way, the assembled electronic torque wrench can be input through the input unit. The force arm value (ie the value) is used to achieve the purpose of obtaining an accurate torque value.

The detailed construction, features, assembly or use of the electronic torque wrench and its torsion strength measuring device provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

10‧‧‧Electronic torque wrench

11‧‧‧Wrench body

111‧‧‧Connecting rod

113‧‧‧Tool head

115‧‧‧ front port

117‧‧‧ rear port

119‧‧‧through hole

13‧‧‧ sensor

131‧‧‧Fixed section

133‧‧‧Strain section

135‧‧‧ Force section

137‧‧‧ front end

139‧‧‧ Backend

141‧‧‧Perforation

15‧‧‧ Grip

151‧‧‧ Inner torus

153‧‧‧ bolt

155‧‧‧Bumps

17‧‧‧ Computing device

171‧‧‧Operating circuit

173‧‧‧ display

20‧‧‧Workpiece

30‧‧‧Electronic torque wrench

31‧‧‧Twist strength measuring device

33‧‧‧ Connecting rod

331‧‧‧ front port

35‧‧‧ sensor

37‧‧‧ Grip

39‧‧‧ Computing device

391‧‧‧Operating circuit

395‧‧‧Input unit

50‧‧‧Tool head

D‧‧‧Distance

Fig. 1 is a schematic view showing a first preferred embodiment of the electronic torque wrench of the present invention.

Fig. 2 is a partial cross-sectional view showing the electronic torque wrench of Fig. 1.

Figure 3 is a schematic diagram of the application of an electronic torque wrench.

Figure 4 is a partial cross-sectional view of the electronic torque wrench.

Figure 5 is a partial cross-sectional view of an electronic torque wrench.

Figure 6 is a block diagram of the sensor and computing device of the electronic torque wrench.

7 and 8 are respectively schematic views of a second preferred embodiment of the torsion strength measuring device of the electronic torque wrench of the present invention.

Figure 9 is a block diagram of a sensor and computing device of an electronic torque wrench.

Hereinafter, the components of the electronic torque wrench of the present invention and the achievement of the effects will be described with reference to the preferred embodiments of the drawings. However, the components, dimensions, and appearance of the electronic torque wrench in the drawings are only used to illustrate the technical features of the present invention, and are not intended to limit the present invention.

1 to 6 are schematic views showing a first preferred embodiment of the electronic torque wrench of the present invention. As shown in FIGS. 1 and 2, the electronic torque wrench 10 of the present invention includes a wrench body 11, a sensor 13, a grip sleeve 15, and a computing device 17.

The wrench body 11 has a connecting rod 111 and a tool head 113. The connecting rod 111 has front and rear ports 115, 117, and the tool head 113 is connected to the connecting rod 111 and protrudes from the front port 115 of the connecting rod 111. In this embodiment, the connecting rod 111 is long straight. Metal tube. The tool head 113 is exemplified by an open wrench. However, the tool head 113 may be a ratchet wrench, a wrench, a socket wrench, or the like.

The sensor 13 generates a sensing signal according to the degree of force applied thereto, and the manner in which the sensor 13 generates the sensing signal is described later. In this embodiment, the sensor 13 is exemplified by a pressure sensor, but in practice, the sensor 13 can also use a gravity sensor or the like to sense the degree of force. The sensor 13 has a fixed section 131, a strain section 133 and a force receiving section 135. The fixed section 131 and the force receiving section 135 are respectively located at the front and rear ends 137 and 139 of the strain section 133. Used to indicate the front and rear ends 137, 139 of the strain section 133, and in fact, the dashed line does not exist. The fixing section 131 is connected to the connecting rod 111 of the wrench body 11. The rear end 139 of the strain section 133 is projecting from the rear port 117 of the connecting rod 111.

The grip sleeve 15 is sleeved on the connecting rod 111 of the wrench body 11 and is connected to the force receiving section 135 of the sensor 13 . The grip 15 is preferably made of a non-slip material such as rubber, plastic or composite material.

The computing device 17 is electrically coupled to the sensor 13 and receives the sensing signal generated by the sensor 13 and processes the sensing signal into a torque value. In this embodiment, the computing device 17 is attached to the connecting rod 111 of the wrench body 11. However, in practice, the position of the computing device 17 can be adjusted and is not limited to the connecting rod 111.

Furthermore, the computing device 17 and the sensor 13 are connected by wires (for example, enameled wires), and the positions of the wires may be inside or outside the wrench body 11.

As shown in FIG. 3, when the tool head 113 of the electronic torque wrench 10 of the present invention is sleeved on a workpiece 20, and the user's hand holds the grip sleeve 15 and faces a locking direction (in the direction of the arrow in the figure). When the rotation is performed, the locking direction of the present embodiment is clockwise, but not limited to the clockwise direction, and the workpiece 20 is exemplified by a nut. However, the workpiece 20 may be a member such as a bolt. Due to the force applied by the user to the grip 15 (as indicated by the arrow in the figure), it is also transmitted to the force receiving section 135 of the sensor 13, so that the strain section 133 of the sensor 13 is deformed, and thus, the sensor 13 will A sensing signal is generated according to the amount of deformation of the strain section 133. The large deformation amount of the strain section 133 indicates that the sensor 13 is subjected to a large force, and the small deformation amount of the strain section 133 indicates that the sensor 13 has a small force. The computing device 17 then receives the sensed signal and processes it into a torque value. The torque value obtained by the computing device 17 is the user's electronic The torque wrench 10 applies the actual torque of the workpiece 20.

As shown in FIG. 4, the connecting rod 111 has a through hole 119 which communicates with the rear port 117 of the connecting rod 111. The fixed section 131 of the sensor 13 is seated in the through hole 119 of the connecting rod 111. In this embodiment, the fixing section 131 and the connecting rod 111 are screwed together, but the connection between the fixing section 131 and the connecting rod 111 is not limited by the screwing manner.

The strain section 133 of the sensor 13 has a perforation 141, and the pattern of the perforations 141 is not limited to that shown in the drawings. The size and size of the perforations 141 are used to control the amount of deformation of the strain segments 133.

The grip sleeve 15 has two bolts 153. The two bolts 153 are screwed to the grip sleeve 15 and the force receiving section 135 of the sensor 13, so that the inner ring surface 151 and the force receiving section 135 of the grip sleeve 15 can be reliably connected together. And the electronic torque wrench 10 of the present invention can surely reflect the value of the torque applied to the workpiece.

As shown in FIG. 5, in addition to the use of the two bolts 153 to connect the grip sleeve 15 and the force receiving section 135, the grip 15 of the electronic torque wrench 10 of the present invention may also have a projection 155 and an inner annulus. 151. The bump 155 protrudes from the inner annular surface 151 and abuts the force receiving section 135 of the sensor 13. Thus, when the grip 15 receives an external force, it can be ensured that the protrusion 155 of the grip 15 is subjected to a single point force on the force receiving portion 135 of the sensor 13 to obtain an accurate torque value of the electronic torque wrench 10 of the present invention. .

In the description of Figures 4 and 5, it can be seen that there are many ways to connect the grip sleeve 15 to the force receiving section 135, and therefore it is not limited to the two figures.

As shown in FIG. 6, the computing device 17 has an arithmetic circuit 171 and a display 173 connected to the arithmetic circuit 171. The arithmetic circuit 171 calculates the sensing signal generated by the sensor 13 into a torque value. The display 173 displays the torque value. Thus, when the user operates the electronic torque wrench of the present invention, the torque value currently applied to the workpiece can be seen from the display 173 at any time.

7 to 9 are schematic views showing a second preferred embodiment of the electronic torque wrench of the present invention. The difference between the preferred embodiment and the first preferred embodiment is that the electronic torque wrench 30 is not included. The tool head of the electronic torque wrench 10. As number 7 As shown in FIG. 8 , the torsion strength measuring device 31 of the electronic torque wrench 30 of the present invention includes a connecting rod 33 , a sensor 35 , a grip 37 and a computing device 39 .

The structure, connection, operation and purpose of the connecting rod 33, the sensor 35 and the grip 37 are the same as those of the connecting rod, the sensor and the grip of the first preferred embodiment, and will not be described herein.

In particular, as shown in Figures 8 and 9, computing device 39 also has an input unit 395. The input unit 395 is connected to the arithmetic circuit 391 and is supplied with a numerical value which is the distance D between the sensor 35 and the center of rotation of the tool head 50. The arithmetic circuit 391 is calculated as a torque value based on the numerical value and the sensing signal.

Physically, the formula of the torque value is multiplied by the force arm, and the force arm is the distance from the point of application to the center of rotation. Corresponding to the embodiment, the force is the sensor 35 that senses the external force. The sensing arm is the distance D (ie, the value) of the center of rotation of the sensor 35 to the tool head 50. According to the calculation formula of the torque value, since the length and the specification of the tool head are different, that is, the rotation center position of the tool head is also different, when the tool head is replaced, the force arm (ie, the numerical value) also changes, so The invention provides an input unit 395 for inputting a more accurate force arm value to obtain a more realistic torque value. However, if the tool head 111 is not replaceable, the input unit 395 can be omitted.

The input unit 395 can be a numeric keypad, a touch screen integrated with the display 393, or other input devices, so the input unit 395 is not limited to the above examples.

Referring to FIG. 7 again, since the connecting rod 33 has the front port 331 arrangement, the user can insert the wrench tool (ie, the tool head 50) from the front port 331 to form an electronic torque wrench 30, as shown in FIG. Shown.

From the above description, it is understood that the electronic torque wrench of the present invention can achieve the object of the present invention.

Finally, it is emphasized that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention, and alternatives or variations of other equivalent elements should also be the scope of the patent application of the present application. Covered.

10‧‧‧Electronic torque wrench

11‧‧‧Wrench body

111‧‧‧Connecting rod

113‧‧‧Tool head

115‧‧‧ front port

117‧‧‧ rear port

13‧‧‧ sensor

131‧‧‧Fixed section

133‧‧‧Strain section

135‧‧‧ Force section

137‧‧‧ front end

139‧‧‧ Backend

15‧‧‧ Grip

17‧‧‧ Computing device

Claims (10)

An electronic torque wrench includes: a wrench body having a connecting rod and a tool head, the connecting rod having two front and rear ports, the tool head connecting the connecting rod and extending from a front port of the connecting rod a sensor generates a sensing signal according to the degree of force thereof, and has a fixed section, a strain section and a force section, the fixing section is connected to the connecting rod of the wrench body, and is located at the strain a front end of the section, the rear end of the strain section protrudes from the rear port of the connecting rod, the force section is located at the rear end of the strain section; a grip sleeve is sleeved on the connecting rod of the wrench body And connecting the force receiving segment of the sensor; and a computing device electrically connecting the sensor and receiving the sensing signal and processing into a torque value. The electronic torque wrench of claim 1, wherein the connecting rod has a through hole that communicates with the front port and the rear port of the connecting rod, and the fixing portion of the sensor is fixed to the In the through hole of the connecting rod, the strain section of the sensor has a perforation. The electronic torque wrench of claim 1 or 2, wherein the grip has a protrusion and an inner ring surface, the protrusion protrudes from the inner ring surface and abuts the sensor Forced section. The electronic torque wrench of claim 1 or 2, wherein the grip has at least one bolt that is screwed to the grip and the force receiving section of the sensor. The electronic torque wrench of claim 1, wherein the computing device is disposed on a connecting rod of the wrench body, the computing device has an arithmetic circuit and a display connected to the computing circuit, and the computing circuit is The sensing signal is calculated to the torque value, and the display displays the torque value. A twisting force measuring device for an electronic torque wrench, comprising: a connecting rod; a sensor generates a sensing signal according to the degree of force thereof, and has a fixed section, a strain section and a force section, the fixing section is connected to the connecting rod and is located at the strain a front end of the segment, the rear end of the strain segment protrudes from the connecting rod, the force receiving portion is located at the rear end of the strain segment; a grip sleeve is sleeved on the connecting rod, and the sensing is connected The force receiving section of the device; and a computing device electrically connecting the sensor and receiving the sensing signal and processing into a torque value. The twisting force measuring device of the electronic torque wrench according to the sixth aspect of the invention, wherein the connecting rod has a front port, a rear port and a through hole, the through hole is connected to the front port of the connecting rod and the rear The port, the fixed section of the sensor is located in the through hole of the connecting rod, and the force receiving section of the sensor is located outside the rear port of the connecting rod. The twisting force measuring device of the electronic torque wrench according to claim 6 or 7, wherein the grip sleeve has a protrusion and an inner ring surface, and the protrusion protrudes from the inner ring surface and is offset Rely on the force section of the sensor. The twisting force measuring device of the electronic torque wrench according to claim 6 or 7, wherein the grip has at least one bolt that is screwed to the grip sleeve and the force receiving portion of the sensor. The twisting force measuring device of the electronic torque wrench according to the sixth aspect of the invention, wherein the computing device is disposed on the connecting rod, the computing device has an arithmetic circuit, a display and an input unit, and the arithmetic circuit The display unit and the input unit are connected, and the sensing signal is calculated as the torque value, and the display unit displays the torque value, and the input unit is configured to input a value.