An automatic tightening device using current characteristics

Abstract

The utility model discloses an automatic tightening device realized by utilizing current characteristics, wherein an intelligent detection module is arranged above a gunstock, a power assembly switch is arranged inside the gunstock, the power assembly switch is connected to the power assembly in the gunstock, a plurality of DC reduction motors are arranged at the front end of the intelligent detection module through auxiliary structural parts, the DC reduction motors are connected to a screwdriver head through a shaft connecting part, and the screwdriver head is connected to a workpiece to be tightened; the intelligent detection module is connected to the DC reduction motor; the intelligent detection module comprises a display digital tube, a power control relay, a negative pole of a motor, a positive pole of a motor, a module setting button, a module adjustment button, a function adjustment button, a feedback signal output terminal, and positive and negative power supply terminals arranged on a circuit board body. The utility model has a real-time current detection function, and can conveniently realize the functions of automatic tooth finding, fast tightening, and automatic stopping during the tightening operation, with high precision and high efficiency.

Description

Technical Field

[0001] The utility model relates to an automatic tightening device, in particular to an automatic tightening device realized by utilizing current characteristics. Background Art

[0002] The bolt tightening connection states include: hard connection, soft connection and neutral connection. For example, the assembly connection between hard metal and hard metal belongs to hard connection (there are also materials introducing: when the assembly torque reaches 50% to 100%, the angular displacement is <30 degrees, which is called hard connection); and there are elastic washers, plastics, paints, PVC, soft metals and other materials that are easy to deform between the connecting parts (there are also materials introducing: when the assembly torque reaches 50% to 100%, the angular displacement is >360 degrees, which is called soft connection). Except for hard connection and soft connection, all other connections belong to neutral connection. The bolt tightening process includes three processes: finding teeth (finding caps), fast screwing in and final tightening. The automatic tightening devices currently on the market do not have automatic detection functions, and do not have the functions of dynamic tooth finding, fast tightening and automatic stop. In order to solve the above problems, the utility model designs an automatic tightening device that uses current characteristics. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an automatic tightening device which utilizes the current characteristics and has a real-time current detection function. It can conveniently realize the functions of automatic thread finding, rapid tightening and automatic stopping during the tightening operation, and has the advantages of high precision and high efficiency.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized by the following technical scheme: an automatic tightening device realized by utilizing current characteristics, comprising a buttstock, a power component switch, an intelligent detection module, an auxiliary structural member, a DC reduction motor, a shaft connection and a screwdriver head, wherein an intelligent detection module is arranged above the buttstock, a power component switch is arranged inside the buttstock, the power component switch is connected to the power component in the buttstock, a front end of the intelligent detection module is arranged with a plurality of DC reduction motors through the auxiliary structural member, the DC reduction motor is connected to the screwdriver head through the shaft connection, and the screwdriver head is connected to the tightened workpiece; the intelligent detection module is connected to the DC reduction motor; the intelligent detection module comprises a display digital tube, a power control relay, a negative pole of a motor, a positive pole of a motor, a module setting button, a module adjustment button, a function adjustment button, a feedback signal output terminal and positive and negative power supply terminals arranged on a circuit board body, and the negative pole of the motor and the positive pole of the motor are connected to the DC reduction motor.

[0005] The power control relay is connected to the power supply component.

[0006] Beneficial effects of the utility model:

[0007] 1. High current detection accuracy: Current sampling uses a high-precision current chip, which can be accurate to 0.01A.

[0008] 2. Wide detection current range: The detected current can achieve a wide range of 0-10A.

[0009] 3. Safe and reliable: using safe working voltage DC12 / 24V.

[0010] 4. Easy to operate: The tightening device has a humanized design, is easy to operate, and is suitable for various tightening scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is described in detail below with reference to the accompanying drawings and specific implementation methods;

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a working diagram of the automatic tightening device of the utility model;

[0014] Figure 3 The torque-current curve diagram of the DC reduction motor of the utility model;

[0015] Figure 4 It is the motor stall curve diagram of the utility model;

[0016] Figure 5 It is a curve diagram of the bolt tightening process of the utility model;

[0017] Figure 6 This is a schematic diagram of the intelligent detection module of the utility model. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] Reference Figure 1 and Figure 6, this specific embodiment adopts the following technical scheme: an automatic tightening device realized by using current characteristics, including a gunstock 1, a power component switch 2, an intelligent detection module 3, an auxiliary structural member 4, a DC reduction motor 5, a shaft connection 6 and a screwdriver head 7, an intelligent detection module 3 is arranged above the gunstock 1, a power component switch 2 is arranged inside the gunstock 1, the power component switch 2 is connected to the power component in the gunstock 1, a plurality of DC reduction motors 5 are arranged at the front end of the intelligent detection module 3 through the auxiliary structural member 4, the DC reduction motor 5 is connected to the screwdriver head 7 through the shaft connection 6, and the screwdriver head 7 is connected to the tightened workpiece 8; the intelligent detection module 3 is connected to the DC reduction motor 5; the intelligent detection module includes a display digital tube 32, a power control relay 33, a motor negative pole 34, a motor positive pole 35, a module setting button 36, a module adjustment button 37, a function adjustment button 38, a feedback signal output terminal 39 and a positive and negative power supply terminal 310, and the motor negative pole 34 and the motor positive pole 35 are connected to the DC reduction motor.

[0020] The power control relay 33 is connected to the power supply assembly.

[0021] The working process of this specific implementation method is as follows Figure 2 As shown, the working characteristics of the DC reduction motor are as follows:

[0022]

[0023] In steady state, its working torque-current characteristic curve is as follows: Figure 3 As shown;

[0024] When the motor working torque reaches the set value, the motor enters the stall state. The working current during stall is usually 3-5 times the normal working current. The motor stall curve is as follows: Figure 4 As shown. Figure 4 Developed intelligent detection modules such as Figure 5 As shown:

[0025] 1. Current acquisition function:

[0026] In normal working mode: the motor working current is collected and detected in real time and displayed through the digital tube, which can be used as the current display function of daily motor working.

[0027] 2. Debugging and setting function:

[0028] Switch to debugging mode: the motor stall working current can be set, the set value can be viewed through the digital tube display, the setting value range is 0-10A, and the setting accuracy is 0.01A.

[0029] 3. Intelligent judgment function:

[0030] By coordinating the setting current and the setting time, the misjudgment of the normal start-up of the motor can be effectively avoided. After the product is tightened, the motor will be blocked. The intelligent module can quickly cut off the working power through the power control relay to protect the motor.

[0031] The bolt tightening process of this specific implementation method includes three processes: finding the thread (finding the cap), fast screwing in and final tightening. The process relationship curve is as follows: Figure 5 shown.

[0032] Embodiment 1: According to Figure 5 , combined with actual product tightening experience, determine Figure 1 The tightening torque of this product is 1.5Nm. The selected matching DC reduction motor model is JGA25-370. Its rated speed before deceleration is 6000rpm. After selecting the 9.6 reduction ratio, the speed is 625rpm. Its parameters are as follows:

[0033]

[0034] The parameter that best matches the tightening torque of 1.5Nm is selected to correspond to the limit load torque of 15kgf.cm, thus obtaining the following working state parameters of the motor:

[0035] Startup state: current is 6A-7.5A, start-up time is 0.3S

[0036] Rated working state: current is 1.5A, continuous working

[0037] Stalled state: current is 5A-7A, allowed duration is 10S

[0038] The final tightening product case parameters are as follows:

[0039] Tightening torque Locked-rotor current setting value Stall setting time 1.5Nm 5A 2S

[0040] At present, this product has been used in the production line for some time and has achieved good results.

[0041] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An automatic tightening device using current characteristics, characterized in that: The invention comprises a gunstock (1), a power supply assembly switch (2), an intelligent detection module (3), an auxiliary structural part (4), a DC reduction motor (5), a shaft connecting part (6) and a screwdriver head (7). The intelligent detection module (3) is arranged above the gunstock (1), the power supply assembly switch (2) is arranged inside the gunstock (1), the power supply assembly switch (2) is connected to the power supply assembly in the gunstock (1), a plurality of DC reduction motors (5) are arranged at the front end of the intelligent detection module (3) through the auxiliary structural part (4), the DC reduction motors (5) are connected to the screwdriver head (7) through the shaft connecting part (6), and the screwdriver head (7) is connected to the DC reduction motor (5) through the shaft connecting part (6). The screwdriver bit (7) is connected to a workpiece (8) to be tightened; the intelligent detection module (3) is connected to a DC reduction motor (5); the intelligent detection module comprises a display digital tube (32) arranged on a circuit board body (31), a power control relay (33), a motor negative pole (34), a motor positive pole (35), a module setting button (36), a module adjustment button (37), a function adjustment button (38), a feedback signal output terminal (39) and a power positive and negative terminal (310); the motor negative pole (34) and the motor positive pole (35) are connected to the DC reduction motor.

2. The automatic tightening device using current characteristics according to claim 1, characterized in that: The power control relay (33) is connected to the power supply assembly.

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