CN2493358Y - Torque set wrench wirh right torque signal sampling and feedback - Google Patents

Abstract

The utility model relates to a constant torque wrench, which can collect and feedback the torsion qualified signal. The handle comprises an inherent device for the general constant torque wrench of a handle body, a rotating body, a sliding block and a spring. The handle also comprises a spindle, a spring pre-tightening piston body, the circuit of the signal collecting and the feedback. The circuit of the signal collecting and feedback comprises a programmable controller, a sensitive switch and a light-emitting diode. The sensitive switch and the spring pre-tightening piston body are arranged in the same shaft. Three light-emitting diodes are evenly distributed in the sidewall of the shell. The programmable controller is arranged outside the shell. The programmable controller receives the switching signal of the sensitive switch in the shell through the communication line, in order to control the lighting period and the lighting time of the light-emitting diode. Compared with the product of the same function in other countries, the utility model has simple structure. The signal collecting and feedback device are arranged in the back part of the handle, which can effectively avoid the possible damage to the device during operation, therefore the utility model can be applied with combination of various kinds of constant torque wrench handles. Requirement for changing amount is small. The price is cheap, which is more applicable for production condition of domestic allocation workplace.

Description

Has the constant torque wrench of executing twist lattice signals collecting and feedback

Technical field:

The utility model relates to a kind of constant torque wrench of executing twist lattice signals collecting and feedback that has, and belongs to machine-building and control technology field.

Background technology:

In the thread connection, double thread is executed need overcome screw thread pair moment (T1) and screw thread pressure-bearing surface moment (T2) when turning round, and therefore executes the screw-down torque T=T1+T2 that turns round.If moment of torsion is excessive, workpiece deformation easily takes place, screw thread stripped thread or screw such as twist off at situation, cause quality problems; Moment of torsion is too small, and it is loosening that the workpiece connection easily takes place, and appearance is conducted electricity, heat conduction is bad, and situations such as gas leakage, leakage cause quality problems; Therefore the double thread connection only applies suitable moment of torsion, just can reach workpiece and connect fastening purpose.The torsional moment of executing for the control double thread guarantees that the thread connection quality constant torque wrench is the instrument of using always, its structure such as Fig. 1.

Each constant torque wrench need be demarcated its nominal torque by metrological service before use, promptly by adjusting screw [8] and locking nut [9] spring [7] is applied pretightning force F.The operator uses the spanner double thread to execute when turning round, the moment of torsion of driving end [1] passes to flip body [5] by fork [2] around the rotation of pin [3], flip body [5] overturns (operation principle such as Fig. 2) when executing torsional moment and reach the nominal torque value of spanner, executes the twist lattice.At this moment, the operator should stop this screw thread continued to execute turning round.Find through production practices, carry out executing of screw thread with manual constant torque wrench and turn round quality control following weak point is arranged: 1) in Assembling Production in enormous quantities, reason such as fast owing to the beat of producing, that labour intensity is big, the situation of turning round omission is executed in existence; 2) come qualifiedly to make judgement with the upset of flip body in operator's subjective sensation wrench body, do not have the collection and the feedback of qualified information, can't carry out the scientific management of quality information what execute torsional moment.

For addressing this problem, the constant torque wrench of band signal feedback device is arranged in the market, can feed back the operation signal of spanner effectively, realize control to fastening omission.But this feedback device is contained in the lateral wall of wrench body, is subjected to unexpected damage easily when using in the complex work environment, and when increasing this device, needs structurally carry out bigger change to former spanner.

Summary of the invention:

To be that design is a kind of have a constant torque wrench of executing twist lattice signals collecting and feedback to the purpose of this utility model, the structure of existing spanner is made improvements, so that spanner is simple in structure, easy to operate, and the manufacturing cost of reduction spanner.

The utility model design have this spanner of constant torque wrench of executing twist lattice signals collecting and feedback, comprise wrench body, driving end, fork, wrench body, flip body, slide block, spring, adjustment screw and locking nut etc. general decide moment of torsion intrinsic device; Also comprise tappet, spring pretension piston body and signals collecting and feedback circuit; Tappet passes the adjustment screw of spanner, and the spring pretension piston in an end and the housing keeps the gap of 0.2～0.3mm, and the other end closely contacts and can move with slide block with the wrench body inner slide; Described housing is installed in the end of wrench body, and described spring pretension piston comprises that two can move axially piston and a spring, and spring places between two pistons, the coaxial end that places housing near spanner of three; Signals collecting and feedback circuit comprise Programmable Logic Controller (PLC), microswitch and light emitting diode, wherein microswitch and the coaxial installation of spring pretension piston body, three light emitting diodes are distributed on the side of housing, Programmable Logic Controller places outside the housing, by the switching signal of the microswitch in the order wire reception housing, the luminance and the time of control light emitting diode.

The utility model is compared with external congenerous product: simple in structure; Signals collecting and feedback device are installed in the wrench body afterbody, and the damage that may cause device in the time of can effectively avoiding operating can be used with polytype constant torque wrench, and is little to the change required amount of constant torque wrench; Low price is more suitable for the working condition of domestic assembly shop; And the signal between production quality control system transmits reliable and stable; The production technology of device is simple, can form a complete production network with corresponding constant torque wrench in constant torque wrench factory.

Description of drawings:

Fig. 1 is the structure diagram of constant torque wrench in the prior art.

Fig. 2 is the fundamental diagram of constant torque wrench shown in Figure 1.

Fig. 3 is the structural representation of the constant torque wrench of the band signal collection of the utility model design and feedback device.

Fig. 4 is constant torque wrench signals collecting and feedback device system circuit diagram.

Fig. 5 is the stressed F ' of constant torque wrench when work flip body and the graph of relation of corner α.

Among Fig. 1～Fig. 4: the 1st, driving end, the 2nd, fork, the 3rd, pin, the 4th, wrench body, the 5th, flip body, the 6th, slide block, the 7th, the spanner spring, the 8th, adjust screw, the 9th, locking nut, the 10th, tappet, the 11st, pretension piston, the 12nd, microswitch, the 13rd, housing, the 14th, order wire, the 15th, light emitting diode, the 16th, preloading spring.

The specific embodiment:

As shown in Figure 3, the utility model design have a constant torque wrench of executing twist lattice signals collecting and feedback, comprise wrench body 4, driving end 1, fork 2, flip body 5, slide block 6, spring 7, adjust screw 8 and locking nut 9 etc. general decide moment of torsion intrinsic device; Also comprise tappet 10, spring pretension piston body and signals collecting and feedback circuit; Tappet 10 passes adjustment screw 8, one ends of spanner and the gap that the spring pretension piston in the housing keeps 0.2～0.3mm, and the other end closely contacts and can move with slide block with wrench body inner slide 6.Housing 13 is installed in the end of wrench body.Spring pretension piston comprises that two can move axially piston 11 and a spring 16, and spring 16 places between two pistons, the coaxial end that places housing near spanner of three.Signals collecting and feedback circuit comprise Programmable Logic Controller (PLC), microswitch and light emitting diode, wherein microswitch and the coaxial installation of spring pretension piston body, three light emitting diodes are distributed on the side of housing, Programmable Logic Controller places outside the housing, by the switching signal of the microswitch in the order wire reception housing, the luminance and the time of control light emitting diode.

When the constant torque wrench operate as normal, when executing the preset value that torsional moment reaches constant torque wrench, the flip body upset of spanner inside, slide block [6] moves axially simultaneously, tappet [10] is delivered to its displacement on the pretension piston [11], by compression spring [16], produce enough pressure, trigger microswitch [12], connect circuit this signal is delivered to Programmable Logic Controller, Programmable Logic Controller is received and is beamed back feedback signal behind the signal and make lumination of light emitting diode [15] and delayed time 0.5 second, makes the operator obtain qualified confirmation signal.

Use the utility model only need axially bore the aperture of a diameter, process one section screw thread at the spanner afterbody and get final product at the adjustment screw [8] of former constant torque wrench as 2.5mm, less to the transformation part of former spanner, so modification scheme is implemented easily; Order wire does not influence the work habit that the operator uses spanner at the rear portion of operator's lever; The tappet and the pretension elastic mechanism structure that increase are small and exquisite, simple.

When using the constant torque wrench double thread to execute to turn round, the active force of constant torque wrench head passes to the part that contact with flip body by pin, and every constant torque wrench is all had the torque value of demarcation in advance is the pretightning force F (as Fig. 1) of spring.Flip body can not rotate when executing torsion less than F, and at this moment screw thread is stressed is the actual moment that applies; As F ' during greater than F, the pass that flip body begins to rotate (as Fig. 2) power F ' and angle of rotation α is: $F^{\′}=(K(\sqrt{2}L\cos (\mathrm{\π}/4-\mathrm{\α})-L)+F)\tan (\mathrm{\π}/4-\mathrm{\α})$ K is the coefficient of elasticity of spring in the formula, and L is the length of side of square flip body, and α is the rotational angle of flip body; K, L, F for every be constant torque wrench fixed value, in formula,, draw relation such as Fig. 5 of F ' and α with K, the L unit of being made as constant " 1 ".

Suddenly fall and additional force that spring in the housing produces is about 0.8～1.8 newton and is far smaller than initial tension of spring F in the spanner when the moving then F ' peak force of flip body one as seen from the figure, and the gap that 0.2～0.3mm is arranged between tappet and pretension piston guarantees can not exert an influence to it at this device of initial stage that F ' reduces, thereby guarantees to use signals collecting and feedback device that the precision of constant torque wrench is not just exerted an influence.

Claims (1)

1, a kind of have this spanner of constant torque wrench of executing twist lattice signals collecting and feedback, comprise wrench body, driving end, fork, wrench body, flip body, slide block, spring, adjustment screw and locking nut, it is characterized in that also comprising tappet, spring pretension piston body and signals collecting and feedback circuit; Described tappet passes the adjustment screw of spanner, and the spring pretension piston in an end and the housing keeps the gap of 0.2～0.3mm, and the other end is with the closely contact and mobile with slide block of wrench body inner slide; Described housing is installed in the end of wrench body, and described spring pretension piston comprises that two move axially piston and a spring, and spring places between two pistons, the coaxial end that places housing near spanner of three; Described signals collecting and feedback circuit comprise Programmable Logic Controller, microswitch and light emitting diode, wherein microswitch and the coaxial installation of spring pretension piston body, three light emitting diodes are distributed on the side of housing, Programmable Logic Controller places outside the housing, by the switching signal of the microswitch in the order wire reception housing, the luminance and the time of control light emitting diode.

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