CN114536262B

CN114536262B - Electric torque wrench

Info

Publication number: CN114536262B
Application number: CN202210315125.8A
Authority: CN
Inventors: 张挺
Original assignee: Shanghai Huxiao Electric Implements Co ltd
Current assignee: Shanghai Huxiao Electric Implements Co ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2023-10-20
Anticipated expiration: 2042-03-29
Also published as: CN114536262A

Abstract

The invention discloses an electric torque wrench, which is characterized in that a counter-force arm connected to a wrench body is arranged as a mounting section, a middle section and a plurality of extension arms which are connected; the connecting blocks are respectively arranged on the middle section and the extension arm, and the extension arm is provided with corresponding connecting grooves, and the groove depth of the connecting grooves is smaller than the thickness of the extension arm. The whole length of the counter-force arm can be adjusted through the connection of the plurality of extension arms, so that the application scenes with different length requirements can be met; the extension arms are respectively connected to the upper end face and/or the lower end face of the corresponding connecting block by utilizing the part of the extension arm with the thickness exceeding the depth of the connecting groove, so that the height of the extension arm positioned at the tail end relative to the middle section or the wrench body can be controlled; therefore, the electric torque wrench of the embodiment can adapt to different distances and height differences between the to-be-twisted bolt and the adjacent bolts, greatly increases the applicable scene, and solves the problems that the existing electric torque wrench and the adaptive counterforce arm have few application scenes and are difficult to meet the actual demands.

Description

Electric torque wrench

Technical Field

The invention belongs to the technical field of wrenches, and particularly relates to an electric torque wrench.

Background

Electric fixed torque wrenches are commonly used in places where the torque required for mounting and dismounting bolts (nuts) is relatively large and the torque accuracy is high. The current electric torque wrench is generally changed according to the current value of the motor in the bolt tightening process, the torque value is controlled by an intelligent controller, and when the current value reaches a preset value, the motor stops working to realize the required torque value. The electric torque wrench mainly comprises a mechanical part consisting of a reduction gearbox, a reaction arm, a sleeve, an internal shaft, a gear and the like, an electromechanical part consisting of a machine body, a handle, a switch, a cable sheath, a driving motor and the like, and an electronic intelligent part consisting of an intelligent controller.

When the electric torque wrench works, the sleeve is sleeved with the bolt which needs to be loosened or tightened, the counterforce arm is supported on the adjacent bolt, the switch is pressed to drive the motor to rotate, the sleeve is driven to rotate clockwise or anticlockwise through the transmission of the mechanical part, and the loosening or tightening of the bolt is realized under the action of the counterforce arm and the supporting point.

When the whole machine leaves the factory, a conventional counter force arm is arranged. However, the reaction arm often has the problem of insufficient length or overlong length, or the situation that the abutting support cannot be realized due to the fact that the height of the tail end of the reaction arm is not matched with the adjacent bolt exists, so that the application scene is less, and the practical use requirement of construction is difficult to meet.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electric torque wrench so as to solve the problems that the existing electric torque wrench and an adaptive counter-force arm have few application scenes and are difficult to meet actual demands.

In order to solve the problems, the technical scheme of the invention is as follows:

the invention provides an electric torque wrench, comprising:

the wrench body is used for rotating the external bolt to be screwed;

the reaction arm comprises a mounting section, a middle section and a plurality of extension arms;

the mounting section is provided with a connecting structure connected to the wrench body;

the first end of the middle section is connected with the mounting section, and the second end of the middle section is provided with a connecting block;

the first end of the extension arm is provided with a connecting groove for detachably connecting the connecting block, and the shape of the connecting block is matched with that of the connecting groove;

the second end of the extension arm is provided with the connecting block for abutting against an external adjacent bolt or being detachably connected with the adjacent extension arm; each extension arm is respectively arranged on the upper end face or the lower end face of the corresponding connecting block through the connecting groove;

wherein the depth of the connecting slot is less than the thickness of the extension arm;

in the connection state, the extension arms are respectively installed to the upper end face or the lower end face corresponding to the connecting block, so that the height difference of the extension arms positioned at the tail end relative to the wrench body is changed.

According to the electric torque wrench, at least one group of corresponding connecting holes are formed in the inner wall surfaces of the connecting block and the connecting groove, and the connecting block and the connecting groove penetrate through the connecting holes through fastening bolts to realize detachable connection.

According to the electric torque wrench, the connecting blocks are of a bilateral symmetry structure along the vertical surface where the extension direction of the counter-force arm is located.

According to the electric torque wrench, the connecting block is in the shape of an isosceles polygon, and the height of the isosceles polygon is the extending direction of the counter-force arm;

the connecting groove is an isosceles polygonal groove corresponding to the connecting block.

In the electric torque wrench, the depth of the connecting groove is half of the thickness of the extension arm.

According to the electric torque wrench, the mounting section, the middle section and the connecting block positioned at the second end of the middle section are integrally formed; the extension arm and the corresponding connecting block are integrally formed.

According to the electric torque wrench, the hollow weight-reducing structure is arranged on the extension arm.

The electric torque wrench is characterized in that the connecting structure is a mounting ring, and a mounting hole for being mounted to the wrench body is formed in the inner wall surface of the mounting ring.

The electric torque wrench comprises a wrench body, a handle and a handle, wherein the wrench body comprises an electric host, a counter-force arm seat and a sleeve;

the reaction arm seat is arranged at the fixed end of the electric host and is used for connecting the connecting structure; the sleeve is arranged at the output end of the electric host.

When the heights of the adjacent external bolts and the bolts to be screwed are the same and the lengths of the connecting blocks at the second ends of the intermediate sections are insufficient, a plurality of extending arms are sequentially overlapped at the intermediate sections, and each connecting groove is respectively and sequentially covered and connected to the upper surface and the lower surface of the corresponding connecting block until the extending arm at the tail end is abutted to the adjacent external bolts;

when the outer adjacent bolt is higher than the outer to-be-screwed bolt and the length of the connecting block at the second end of the middle section is insufficient, sequentially and upwards superposing a plurality of extension arms at the middle section, and respectively covering and connecting each connection groove to the upper surface of the corresponding connecting block until the extension arm at the tail end is abutted to the outer adjacent bolt;

when the outer adjacent bolt is lower than the outer to-be-screwed bolt and the length of the connecting block at the second end of the middle section is insufficient, a plurality of extension arms are sequentially overlapped downwards from the middle section, and each connection groove is respectively attached and connected to the lower surface of the corresponding connecting block until the extension arm at the tail end is abutted to the outer adjacent bolt.

By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:

according to the embodiment of the invention, the counter-force arm connected to the wrench body is provided with the connecting installation section, the middle section and the plurality of extension arms; wherein, be provided with the connecting block on interlude and the extension arm respectively, and be equipped with corresponding spread groove on the extension arm, the groove depth of spread groove sets up to be less than the thickness of extension arm, and extension arm accessible spread groove installs the up end or the lower terminal surface of corresponding connecting block. The whole length of the counter-force arm can be adjusted through the connection of the plurality of extension arms, so that the application scenes with different length requirements can be met; meanwhile, the parts of the extension arms, the thickness of which exceeds the depth of the connecting groove, are respectively connected to the upper end face or the lower end face of the corresponding connecting block or respectively connected to the upper end face and the lower end face of the connecting block through a plurality of extension arms, so that the heights of the extension arms positioned at the tail ends relative to the middle section or the wrench body can be controlled to adapt to the height difference of the adjacent bolts relative to the bolts to be screwed; therefore, the electric torque wrench of the embodiment can adapt to different distances and different height differences between the to-be-twisted bolt and the adjacent bolt, greatly increases applicable scenes, and solves the problems that the existing electric torque wrench and the adaptive counter-force arm have few application scenes and are difficult to meet actual demands.

Drawings

FIG. 1 is a schematic diagram of an electric torque wrench of the present invention;

FIG. 2 is another schematic view of the electric torque wrench of the present invention;

FIG. 3 is a schematic view of an installation of a reaction arm of the electric torque wrench according to the present invention;

FIG. 4 is a cross-sectional view of an embodiment of the present invention for mounting a reaction arm of an electric torque wrench;

FIG. 5 is a schematic view of another mounting of the reaction arm of the electric torque wrench of the present invention;

FIG. 6 is a schematic view of another mounting of the reaction arm of the electric torque wrench of the present invention;

fig. 7 is a cross-sectional view of the connection block and the extension arm of the electric torque wrench of the present invention.

Reference numerals illustrate: 1: a wrench body; 2: a sleeve; 3: a mounting section; 301: a mounting hole; 4: an intermediate section; 5: an extension arm; 501: hollow weight-reducing structure; 6: a bolt to be screwed; 7: adjacent bolts; 8: a connecting block; 9: a fastening bolt; 10: a connecting groove; 11: and a connection hole.

Detailed Description

The invention provides an electric torque wrench which is further described in detail below with reference to the accompanying drawings and specific examples. Advantages and features of the invention will become more apparent from the following description and from the claims.

Referring to fig. 1 and 2, in one embodiment, an electric torque wrench includes a wrench body 1 for turning an external bolt 6 to be screwed and a reaction arm.

The reaction arm may in particular comprise a mounting section 3, a middle section 4 and several extension arms 5. The mounting section 3 is provided with a connection structure for connection to the wrench body 1. The first end of the intermediate section 4 is connected to the mounting section 3, and the second end of the intermediate section 4 is provided with a connecting block 8.

The first end of the extension arm 5 is provided with a connecting slot 10 for detachably connecting the connecting block 8, and the connecting block 8 is matched with the connecting slot 10 in shape. The second end of the extension arm 5 is provided with a connection block 8 for abutment against an external abutment bolt 7 or detachable connection with an adjacent extension arm 5. Each extension arm 5 is mounted on the upper end surface or the lower end surface of the corresponding connection block 8 through a connection groove 10. Wherein the depth of the connecting channel 10 is less than the thickness of the extension arm 5.

In the connected state, the extension arm 5 is respectively mounted to the upper end face or the lower end face of the corresponding connection block 8, so as to change the height difference of the extension arm 5 away from the end of one side of the wrench body 1 relative to the wrench body 1.

The present embodiment provides for the installation section 3, the intermediate section 4 and the plurality of extension arms 5 to be connected by arranging the counter-force arm connected to the wrench body 1. Wherein, be provided with connecting block 8 on interlude 4 and the extension arm 5 respectively, and be equipped with corresponding spread groove 10 on the extension arm 5, the depth of spread groove 10 sets up to be less than the thickness of extension arm 5, and extension arm 5 accessible spread groove 10 installs to the up end or the lower terminal surface of corresponding connecting block 8.

In practical application, when the maximum extension end of the counter force arm and the adjacent nut have no required length, the practical use requirement of construction cannot be met; when the length of the main arm of the reaction arm exceeds the excessive length of the actual space, the excessive length is required to be cut off (the inner side wall of the structural part is not touched) so as to meet the use condition, and the problem is that the distribution of the distances of all bolts is large in the field construction process, and the main arm of various length specifications is required to be matched, so that the defects of high use cost, heavy accumulated weight, troublesome carrying, inconvenient management and the like are caused. The whole length of the reaction arm can be adjusted by connecting the plurality of extension arms 5, so that application scenes with different length requirements can be met, and the reaction arm can be carried only by carrying the plurality of extension arms 5.

In practical application, when the bolt 6 to be screwed and the adjacent bolt 7 are not on the same plane, the existing reaction arm often cannot meet the practical use requirement of construction, or needs to carry special-shaped reaction arms with various specifications to meet different height difference requirements, and the defects of high use cost, heavy accumulated weight, troublesome transportation, inconvenient management and the like are caused. In this embodiment, the extension arm 5 is connected to the upper end face or the lower end face of the corresponding connection block 8 or to the upper end face and the lower end face of the connection block 8 respectively by using the portion of the extension arm 5 with a thickness exceeding the depth of the connection slot 10, so that the height of the extension arm 5 at the end relative to the middle section 4 or the wrench body 1 can be controlled to adapt to the height difference of the adjacent bolt 7 relative to the to-be-screwed bolt 6. Therefore, the electric torque wrench of the embodiment can adapt to different distances and different height differences between the to-be-screwed bolt 6 and the adjacent bolt 7, the applicable scene is greatly increased, and the problems that the existing electric torque wrench and the adaptive counter-force arm are few in application scene and difficult to meet actual requirements are solved.

The specific structure of the torque handle of the present embodiment is further described below with reference to fig. 1 to 7:

in this embodiment, as shown in fig. 2, the mounting section 3, the intermediate section 4 and the connection block 8 may form a Z-shaped bent structure, so that the height of the connection block 8 matches the height of the sleeve 2 on the electric torque wrench.

As shown in fig. 7, in this embodiment, by providing the connecting block 8 and the connecting groove 10 that are matched, a torque transmission structure is formed by matching, that is, the outer side wall of the connecting block 8 and the inner side wall of the connecting groove 10 are attached to achieve the relative position fixation between the two, so as to form a stable connection structure, and the radial torque can be reliably transmitted through the transmission of bearing capacity. Wherein, connecting block 8 and spread groove 10 can set up to clearance fit or transition fit to can ensure that radial moment of torsion can be steadily transmitted between connecting block 8 and the spread groove 10, also can ensure that it is easy to install and dismantle.

Further, at least one group of corresponding connecting holes 11 are formed in the inner wall surfaces of the connecting block 8 and the connecting groove 10, and the connecting block 8 and the connecting groove 10 are detachably connected through the connecting holes 11 through fastening bolts 9. In this embodiment, two sets of corresponding connection holes 11 are specifically adopted, and the fixed connection between one extension arm 5 and the corresponding connection block 8 is achieved through two fastening bolts 9, and in other embodiments, the number can be determined according to specific requirements, which is not specifically limited herein.

Preferably, the arrangement direction of the plurality of groups of connecting holes 11 is the whole extending direction of the counter-force arm, so that the fixing between the connecting block 8 and the extension arm 5 is more stable.

In this embodiment, the connection block 8 may be provided in a bilaterally symmetrical structure along a vertical plane in which the reaction arm extends. The shape of the connecting slot 10 is also matched with the connecting block 8, so that the extending direction of the extending arm 5 is the same regardless of whether the extending arm 5 is mounted on the upper end surface or the lower end surface of the connecting block 8, and the extending direction of the whole extending arm 5 is positioned on the same straight line.

Further, the shape of the connection block 8 may be an isosceles polygon, and the height of the isosceles polygon is the extending direction of the reaction arm. The connecting groove 10 may also be an isosceles polygonal groove corresponding to the connecting block 8.

Specifically, the connection block 8 may be an isosceles trapezoid, i.e. an isosceles trapezoid block, where the long sides of the isosceles trapezoid block are connected to the second end of the middle section 4, and one end of the short side of the isosceles trapezoid block is used to be inserted into the corresponding connection slot 10.

The connecting groove 10 is also isosceles trapezoid, i.e. an isosceles trapezoid groove, and the long side of the isosceles trapezoid groove is located at the end face of the first end of the extension arm 5, and is in a hollow structure, so that the end face of the first end of the extension arm 5 can be directly inserted into the isosceles trapezoid groove.

In this embodiment, the depth of the connecting channel 10 is half the thickness of the extension arm 5. Therefore, when the required height of the tail end connecting arm is the same as that of the second end of the middle section 4, half of the tail end connecting arm is connected to the upper end face of the corresponding connecting block 8 by arranging the two extending arms 5, and the other half of the tail end connecting arm is connected to the lower end face of the corresponding connecting block 8, so that the combination among the extending blocks is facilitated.

Of course, in other embodiments, the depth of the connecting slot 10 may be set to one third of the thickness of the extension arm 5 or other values as desired, which are not particularly limited herein.

For example, as shown in fig. 3, two extension arms 5 may be provided and respectively mounted on the upper end surface and the lower end surface of the corresponding connection block 8, so that the height of the extension arm 5 at the end is not changed. As shown in fig. 5, two extension arms 5 are installed on the upper end surfaces of the corresponding connection blocks 8, and since the depth of the connection groove 10 is half of the thickness of the extension arm 5, the end extension arm 5 is lifted by the thickness of one extension arm 5 relative to the second end of the middle section 4. As shown in fig. 6, by providing two extension arms 5, both of which are mounted on the lower end surfaces of the corresponding connection blocks 8, since the depth of the connection groove 10 is half the thickness of the extension arm 5, the height of the end extension arm 5 with respect to the second end of the intermediate section 4 is reduced by one extension arm 5.

In this embodiment, the mounting section 3, the intermediate section 4 and the connection block 8 at the second end of the intermediate section 4 may be provided as an integral molding. The extension arm 5 and the corresponding connection block 8 can also be provided as an integral molding.

Further, under the condition of keeping the mechanical property of the extension arm 5, the hollowed weight-reducing structure 501 can be arranged on the extension arm 5, so that the weight of the extension arm 5 is reduced, and the extension arm is more convenient to carry. Specifically, the periphery of the connection hole 11 may be opened on the extension arm 5, and the extension arm 5 is located at the rear portion of the connection groove 10.

In this embodiment, the connection structure is a mounting ring, and the inner wall surface of the mounting ring is provided with a mounting hole 301 for mounting to the wrench body 1, and the connection with the wrench body 1 can be achieved through a spline in the mounting hole 301.

In this embodiment, the wrench body 1 may include an electric host, a reaction arm base, a socket 2, a torque adjusting module, and the like. The reaction arm seat is arranged at the fixed end of the electric host and is used for being in spline connection with the mounting hole 301. The sleeve 2 is arranged at the output end of the electric host machine and is used for sleeving the bolt 6 to be screwed or unscrewed. The torque adjusting module is arranged on the electric host machine and is used for adjusting the output torque of the sleeve 2.

The following describes a specific application of the electric torque wrench of the present embodiment:

in the existing practical application scene, such as a breaking hammer installation scene, the interval between a bolt to be screwed and an adjacent bolt is larger, and the intervals are not all on the same plane, the length of a reaction arm matched with a conventional electric torque wrench is shorter, the existing mode is that a sleeve is sleeved on the conventional reaction arm, the fixed connection between the sleeve and the conventional reaction arm is realized in a mode of drilling and matching with the bolt, and the adjacent bolt is abutted through the sleeve. And this connection does not match the case where the two bolts are not on the same plane. Further, the larger spacing of the two bolts or the different heights often occur during the vehicle chassis installation, engine block installation, or assembly phase of the electric drive assembly.

The reaction arm used in the electric torque wrench of this embodiment includes a mounting section 3, a middle section 4 and a plurality of extension arms 5, and the length of the reaction arm can be changed by overlapping a plurality of extension arms 5, and the height of the reaction arm can be changed relative to the bolt to be screwed. For example, when the length is insufficient, the extension arm 5 can be sequentially overlapped to extend; when the length and the height cannot be met, the multiple extension arms 5 can be sequentially overlapped upwards or downwards, the change of the length and the height can be obtained, and the adaptive scene is more and wider.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.

Claims

1. An electric torque wrench, comprising:

the wrench body is used for rotating the external bolt to be screwed;

the first end of the extension arm is provided with a connecting groove for detachably connecting the connecting block, and the shape of the connecting block is matched with that of the connecting groove; the second end of the extension arm is provided with the connecting block for abutting against an external adjacent bolt or being detachably connected with the adjacent extension arm;

each extension arm is respectively arranged on the upper end face or the lower end face of the corresponding connecting block through the connecting groove;

2. The electric torque wrench as claimed in claim 1, wherein at least one set of corresponding connection holes is provided on inner wall surfaces of the connection block and the connection groove, and the connection block and the connection groove are detachably connected through the connection holes by fastening bolts.

3. The electric torque wrench of claim 1, wherein the connection block has a bilaterally symmetrical structure along a vertical plane in which the reaction arm extends.

4. The electric torque wrench as claimed in claim 3, wherein the connection block is in the shape of an isosceles polygon, and the height of the isosceles polygon is the extending direction of the reaction arm;

5. The electric torque wrench of claim 1, wherein the depth of the connection slot is one half the thickness of the extension arm.

6. The electric torque wrench of claim 1, wherein the mounting section, intermediate section and the connecting block at the second end of the intermediate section are integrally formed; the extension arm and the corresponding connecting block are integrally formed.

7. The electric torque wrench of claim 1, wherein the extension arm is provided with a hollowed-out weight-reducing structure.

8. The electric torque wrench of claim 1, wherein the connection structure is a mounting ring having mounting holes on an inner wall surface thereof for mounting to the wrench body.

9. The electric torque wrench of claim 1, wherein the wrench body comprises an electric mainframe, a reaction arm mount, and a sleeve;

10. The electric torque wrench as claimed in claim 1, wherein when the heights between the external adjacent bolt and the external bolt to be screwed are the same and the length of the connection block at the second end of the intermediate section is insufficient, each of the connection grooves is respectively covered and connected to the upper and lower surfaces of the corresponding connection block in turn by sequentially stacking a plurality of the extension arms at the intermediate section until the extension arm at the end is abutted to the external adjacent bolt;