CN211439732U - Automatic torque wrench of formula of predetermineeing - Google Patents

Abstract

The utility model discloses a preset automatic torque wrench, which comprises a wrench head, wherein one side of the wrench head is hinged with a first lever through a pin; a second lever is arranged on one side of the first lever, and the first lever is in contact fit with the second lever; the outer sleeves are sleeved on the wrench head, the first lever and the second lever through cylindrical pins; one side of the second lever is connected and matched with the ejector rod; the right end of the ejector rod is connected with a first spring, and the right end of the first spring is connected with a pressure sensor; the right end of the pressure sensor is connected with the adjusting rod, and the adjusting rod is sleeved inside the torque grade adjusting device through a nut. The device has solved prior art and still need the manual setting to the big or small torque value that exerts of the bolt of specification difference, need inquire relevant manual or application formula to the size of the pretension torque value of different bolts and calculate and learn, the very inconvenient problem of operation, has easy and simple to handle, can reduce intensity of labour, improves the efficiency of construction, reduces construction cost's characteristics.

Description

A preset automatic torque wrench

technical field

The utility model relates to the technical field of wrenches, in particular to a preset automatic torque wrench.

Background technique

Article 6.1.6 of GB50233-2005 (110kv-500kv Overhead Transmission Line Construction and Acceptance Specifications) stipulates mandatory provisions, especially the assembly requirements for transmission towers, and a torque wrench should be used during initial installation. , The connecting bolts should be tightened one by one, and the torque wrench must be used for the bolt connection to reach the torque value. The reliability of the bolt tightening is controlled by observing the bolt torque value. According to the requirements, after the erection of the overhead line tower, all bolts should be tightened again, and the torque value should be checked again after the wire is erected. The tightening torque of the bolts shall not be less than the specified value. There are many existing torque wrenches, which can be divided into manual type, pneumatic type, electric type and hydraulic type according to the power. According to the display, it can be divided into pointer type and digital display. . Manual pointer type is the mainstream product on the market, the price is cheap, and the disadvantage is that the accuracy is low. Others are relatively expensive, and in some industries that require high accuracy and efficiency of the tightening torque of threaded fasteners, the demand is also increasing. Fixed-value alarm torque wrenches mostly use microprocessor digital processing technology, use strain gauges as sensors, preset the maximum torque value, and give an alarm when the applied torque reaches the preset value. Pneumatic, electric and hydraulic overload fail-type torque wrenches are used to unload the power module to achieve torque failure after the torque value reaches the preset value. At present, most of the research on torque wrenches focus on digital torque wrenches that have both fixed value alarm and overload failure functions. There is a dilemma between precision and price. The wrenches with higher precision are usually digital torque wrenches. Most of the products, the price is generally higher. The lower price is mostly pointer type torque wrench with simple structure, which has low precision and is difficult to meet the requirements of use, and the torque range of the existing torque wrench is small, and the bolt diameter changes in a large range, and the existing wrench has no torque level adjustment. The torque wrench is difficult to adapt to the complex working conditions with large changes in bolt diameter, and the design of the wrench does not fully follow the ergonomic design principles, and the length of the handle cannot be adjusted with the setting of the applied torque value, that is, it cannot be adjusted by adjusting The size of the lever arm makes the operation more convenient. This is also one of the reasons why the torque wrench is not widely used in related fields. At the same time, the torque value applied by the existing torque wrench to bolts with different specifications still needs to be manually set, and the preload torque value of different bolts needs to be checked. Manual or use formula to calculate. At present, only the products of some special industries will be attached to the preload force of common common bolts related to the bolt preload force, and the specific value is still determined by experience.

Utility model content

The technical problem to be solved by the utility model is to provide a torque wrench, which is suitable for different bolt diameters in different working conditions of the transmission line. The bolt diameter value is manually input in the touch button of the electronic control system, and the electronic control system is based on the built-in bolt specifications. The relationship between the torque and the tightening torque (the value of the tightening torque is obtained through theoretical calculation and experiments through DLT 1236-2013 Specifications of anchor bolts and nuts for transmission towers and actual working conditions of transmission towers and anchor bolts and nuts), automatic Set the required tightening torque to be displayed on the LED electronic display, and manually adjust the torque level adjustment device so that the pre-tightening force of the built-in spring is equal to the corresponding level, that is, the torque interval value of this level is adapted to the torque value required by the bolt specification. , Since the force measurement principle of this torque wrench is that the head of the torque wrench rotates with a small range of angle relative to the outer sleeve with the cylindrical pin as the center, the force is transmitted to the ejector rod through the lever to generate a radial motion compression spring, and the pressure sensor measures at this time. pressure. Adjusting the range of the built-in spring preload can increase the range of the measured torque value (when the bolt tightening force is large and the spring preload force is small, when the angle of the torque wrench rotates to the maximum, the measured value of the sensor does not reach the maximum tightening force of the bolt. Increasing the pre-tightening force of the spring can make the rotation angle of the torque wrench within the rotation range and accurately measure the maximum tightening force of the bolt), and at the same time improve the tightening accuracy. When tightening, adjust the length of the torque wrench, that is, by adjusting the force arm size, making the operation more convenient.

In order to realize the above design, the technical scheme adopted by the present invention is: a preset automatic torque wrench, which includes a wrench head, one side of the wrench head is hingedly connected with the first lever through a pin; one side of the first lever is provided with There is a second lever, and the first lever is in contact with the second lever; the head of the wrench, the outside of the first lever and the second lever are sleeved with an outer sleeve through a cylindrical pin; one side of the second lever is connected and matched with the ejector rod; the ejector rod The right end is connected with a first spring, and the right end of the first spring is connected with a pressure sensor; the right end of the pressure sensor is connected with an adjusting rod, and the adjusting rod is sleeved inside the torque level adjusting device through a nut.

A ratchet wheel is installed inside the head of the wrench, the head of the ratchet wheel is square, and a steel ball and a second spring are arranged inside.

The head of the wrench is also provided with a reversing lever, and a pair of reversing levers are arranged on both sides of the reversing lever; the reversing lever is axially connected with a reversing handle; the reversing lever is engaged with the tooth structure of the ratchet.

The side surface of the reversing lever is in contact with the limit spring; when the reversing lever is in contact with the reversing lever on one side, the reversing lever on the other side automatically rotates and engages with the ratchet under the action of the spring preload.

The outer surface of the outer sleeve is provided with a slot, and an electronic control system including a processor and a display is installed in the slot.

The left side of the top rod is provided with a cam; the right side of the second lever is an inclined surface structure, which is in contact with the cam.

The nut is fixed inside the torque level adjusting device; the surface of the adjusting rod is provided with a thread to cooperate with the nut.

A battery is arranged on the inner right side of the torque level adjusting device; a detachable handle is connected to the right end of the torque level adjusting device through bolts.

The beneficial effects of the present utility model are:

The torque wrench adopts a modular design, which is light in weight, small in size, and easy to carry. The head is equipped with a ratchet and a reversing device, which enables the device to operate in two directions. For the different bolt diameters of the transmission line under different working conditions, input the bolt diameter, and the electronic control system automatically sets the required tightening torque through accurate calculation according to the bolt specification, and displays it on the electronic display screen. The operator rotates the torque level according to the torque value. The adjustment device, because the adjustment rod and the torque level adjustment device are fixedly connected by a nut, that is, the torque level adjustment device is manually rotated, and the adjustment rod moves radially forward or backward in the inner sleeve correspondingly, so as to compress and relax the spring, Adapting the torque range of this level to the torque required by the diameter of the bolt can improve the tightening accuracy compared to manual experience. At the same time, the principle of this torque wrench is that the head of the torque wrench rotates with a small range of angle relative to the outer sleeve with the cylindrical pin as the center, and the force is transmitted to the ejector rod through the lever to generate radial motion, compress the spring, and the pressure sensor measures at this time. At the same time, the spring provides the pre-tightening force, and the rotation angle of the torque wrench head is limited within the limit deflection angle, that is, when tightening a small torque, the pre-tightening force provided by the spring is very small to limit the rotation of the torque wrench head to the limit. Within the deflection angle, when tightening a large torque, the spring needs to provide a large pre-tightening force to limit the rotation of the torque wrench head within the limit deflection angle. Through the spring pre-tightening device, the range of the torque wrench can be increased. When tightening, adjust the length of the torque wrench, that is, by adjusting the size of the force arm, the operation is more convenient, and the operation is easier when the torque value is large. The utility model is convenient to use, can reduce labor intensity, improve construction efficiency and reduce construction cost.

Description of drawings

FIG. 1 is a partial cross-sectional view of the utility model.

Figure 2 is an assembly drawing of the utility model.

Figure 3 is an internal assembly diagram of the wrench head in the present invention.

FIG. 4 is an assembly view of the second lever and the ejector rod in the utility model.

FIG. 5 is an assembly view of the adjusting rod and the torque level adjusting device in the utility model.

Reference numerals in the figure are: wrench head 1, outer sleeve 11, electronic control system 12, first lever 16, second lever 18, cam 19, ratchet 2, ejector rod 21, first spring 23, pressure sensor 24 , adjustment rod 25, nut 26, torque level adjustment device 27, battery 28, detachable handle 29, reversing lever 3, reversing lever 4, limit spring 5, steel ball 6, second spring 7, reversing handle 8 .

Detailed ways

As shown in Figures 1 to 5, a preset automatic torque wrench includes a wrench head, one side of the wrench head is hinged with a first lever through a pin; one side of the first lever is provided with a second lever, the first The lever is in contact with the second lever; the head of the wrench, the outside of the first lever and the second lever are sleeved with an outer sleeve through a cylindrical pin; one side of the second lever is connected and matched with the ejector rod; the right end of the ejector rod is connected with a spring, and the right end of the spring It is connected with the pressure sensor; the right end of the pressure sensor is connected with the adjusting rod, and the adjusting rod is sleeved inside the torque level adjusting device through a nut.

Preferably, the torque wrench includes a torque wrench head 1, an outer sleeve 11, a torque level adjusting device 27, a detachable handle 29, an electronic control system 12, a ratchet 2 installed inside the wrench head, a reversing lever 3, The head of the direction rod 4, the limit spring 5 and the ratchet 2 is square, and the steel ball 6 and the second spring 7 are installed, which can effectively prevent the nut sleeve from falling off when it is connected with the nut sleeve of different specifications.

Preferably, the reversing lever 3 is axially connected with the reversing handle 8, and the reversing lever 4 is engaged with the teeth of the ratchet 2, and the reversing handle 8 can be adjusted to realize the forward and reverse rotation of the ratchet 2, and adapt to the forward and reverse tightening of the nut; The side of the reversing lever 4 is in contact with the limit spring 5, so that when the reversing lever 3 is in contact with the reversing lever 4 on one side, the reversing lever 4 on the other side automatically rotates with the ratchet 2 under the action of the spring preload. mesh.

Preferably, the outer sleeve 11 is connected with the torque wrench head 1, the first lever 16 inside the outer sleeve 11 is connected with the wrench head 1 through a cylindrical pin, and the second lever 18 is connected with the outer sleeve 11 through a cylindrical pin , the first lever 16 transmits the force to the second lever 18 through surface contact with the second lever 18, and the second lever 18 contacts the surface of the cam 19 on the ejector bar 21 to transfer the force to the ejector bar 21, the tightening of the wrench head 2 In the process of transmitting the torque to the ejector rod 21 through the lower lever 16 and the second lever 18, the force can be reduced. During the design and manufacturing process, the specifications of the torque level adjusting device 27 and the sensor 24 of the electronic control system 12 can be correspondingly reduced. ,save costs.

Preferably, a first spring 23 is installed inside the outer sleeve 11 , the left end of the first spring 23 is in plane contact with the ejector rod 21 , the right end of the first spring 23 is connected with the pressure sensor 24 , and the torque level adjusting device 27 is adjusted through the nut 26 Rods 25 are connected.

Preferably, the electronic control system 12 is installed in the groove of the outer sleeve 11, and the electronic control system 12 displays the maximum tightening torque on the electronic display screen according to the relationship between the bolt specifications, the built-in bolts and the tightening torque, and the outer sleeve 11 and the torque level The adjusting device 27 is connected by threads, and the operator manually rotates the torque level adjusting device 27 according to the torque value. Since the adjusting rod 25 and the torque level adjusting device 27 are connected by the nut 26, that is, the torque level adjusting device 27 is manually rotated, and the corresponding adjusting rod Move radially forward or backward in the inner sleeve to compress and relax the spring, so that the preload force of the inner spring is equal to the corresponding level, so that the torque interval value of this level is adapted to the torque value required by the diameter of the bolt, increasing the Tightening accuracy.

Preferably, a battery 28 is placed at the rear of the torque level adjusting device 27 to provide power for the electric control system of the torque wrench. A removable handle 29 can be installed at the rear of the torque level adjusting device 27 to reduce the labor intensity of workers.

Preferably, the torque level adjusting device 27 has anti-slip stripes on the periphery. By setting the anti-slip stripes on the torque level adjusting device 27, when the torque level adjusting device 27 is rotated, the friction between the operator's hand and the adjusting nut can be increased, which is convenient for use and adjustment. .

The above-mentioned embodiments are only the preferred technical solutions of the present invention, and should not be regarded as limitations of the present invention. The embodiments and features in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present utility model shall take the technical solutions described in the claims, including the equivalent alternatives of the technical features in the technical solutions described in the claims, as the protection scope. That is, equivalent replacements and improvements within this scope are also within the protection scope of the present invention.

Claims (8)

1. A preset automatic torque wrench, characterized in that: it comprises a wrench head (1), and one side of the wrench head (1) is hingedly connected with a first lever (16) through a pin; the first lever (16) A second lever (18) is provided on one side, and the first lever (16) is in contact with the second lever (18); The pin is sleeved with an outer sleeve (11); one side of the second lever (18) is connected and matched with the ejector rod (21); the right end of the ejector rod (21) is connected with a first spring (23), and the right end of the first spring (23) It is connected with the pressure sensor (24); the right end of the pressure sensor (24) is connected with the adjusting rod (25), and the adjusting rod (25) is sleeved inside the torque level adjusting device (27) through the nut (26). 2. A preset automatic torque wrench according to claim 1, characterized in that a ratchet (2) is installed inside the wrench head (1), the head of the ratchet (2) is square, and the inside is provided with Steel ball (6) and second spring (7). 3. A preset automatic torque wrench according to claim 1, characterized in that: the wrench head (1) is further provided with a reversing lever (3), and the reversing lever (3) has two A pair of reversing rods (4) are arranged on the sides; the reversing lever (3) is axially connected with a reversing handle (8); the reversing rod (4) is engaged with the tooth structure of the ratchet (2). 4. A preset automatic torque wrench according to claim 3, characterized in that: the side surface of the reversing lever (4) is in contact with the limit spring (5); the reversing lever (3) is in contact with a When the reversing lever (4) on the other side is in contact, the reversing lever (4) on the other side automatically rotates and engages with the ratchet (2) under the action of the spring preload. 5. A preset automatic torque wrench according to claim 1, characterized in that: the outer surface of the outer sleeve (11) is provided with a slot, and an electronic control system (12) is installed in the slot, including a treatment device and display. 6 . The preset automatic torque wrench according to claim 1 , wherein a cam ( 19 ) is provided on the left side of the ejector rod ( 21 ); the right side of the second lever ( 18 ) is an inclined surface structure, Engage with cam (19). 7 . The preset automatic torque wrench according to claim 1 , wherein the nut ( 26 ) is fixed inside the torque level adjusting device ( 27 ); the surface of the adjusting rod ( 25 ) is provided with threads and nuts. 8 . (26) FIT. 8. A preset automatic torque wrench according to claim 1, characterized in that: a battery (28) is provided inside the torque level adjusting device (27) on the right side; the right end of the torque level adjusting device (27) passes through the Bolted with removable handle (29).

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